5 UTRAN Connected Mode Mobility

25.1233GPPRelease 17Requirements for support of radio resource management (TDD)TS

This section contains the requirements on the mobility procedures in UTRAN connected mode such as handover and cell re-selection.

Requirements related to the measurements in support of the execution of the UTRAN connected mode mobility procedures are specified in section 8.

The radio links the UE shall use are controlled by UTRAN with RRC signalling.

UE behaviour in response to UTRAN RRC messages is described in [16].

The purpose of Cell reselection in CELL_FACH, CELL_PCH and URA_PCH states is that the UE shall select a better cell according to the cell reselection criteria in [18]. CELL_FACH, CELL_PCH and URA_PCH states are described in [16].

5.1 TDD/TDD Handover

5.1.1 Introduction

5.1.1.1 3.84 Mcps TDD option

The TDD/TDD handover procedure is initiated from UTRAN with a RRC message that implies a hard handover as described in [16].

The TDD/TDD handover procedure may cause the UE to change its frequency.

5.1.1.2 1.28 Mcps TDD option

The purpose of TDD/TDD handover is to change the cell of the connection between UE and UTRAN. The handover procedure is initiated from UTRAN with a RRC message that implies a handover, refer to [16].The handover procedure may cause the UE to change its frequency.

In the case of multi-frequency network, handover can occure between primary frequency in serving cell and primary frequency in target cell, primary frequency in serving cell and secondary frequency in target cell, secondary frequency in serving cell and primary frequency cell in target cell.

5.1.1.3 7.68 Mcps TDD option

The TDD/TDD handover procedure is initiated from UTRAN with a RRC message that implies a hard handover as described in [16].

The TDD/TDD handover procedure may cause the UE to change its frequency.

5.1.2 Requirements

5.1.2.1 TDD/TDD handover delay

5.1.2.1.1 3.84 Mcps TDD option

RRC procedure performance values for all RRC procedures that can command a hard handover are specified in [16].

When the UE receives a RRC message implying TDD/TDD handover with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCH within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCH at the designated activation time + interruption time.

where:

D_handover equals the RRC procedure performance value defined in [16] plus the interruption time stated in section 5.1.2.2.1.

5.1.2.1.2 1.28 Mcps TDD option

RRC procedure performance values for all RRC procedures that can command a hard handover are specified in [16].

When the UE receives a RRC message that implies a TDD/TDD handover, with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall start transmission within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCH or the SYNC-UL in case that a handover to 1.28 Mcps TDD option with SYNCH uplink exchange is recommended at the designated activation time + interruption time.

where D_handover equals the RRC procedure performance value defined [16] plus the interruption time stated in section 5.1.2.2.2.

5.1.2.1.3 7.68 Mcps TDD option

RRC procedure performance values for all RRC procedures that can command a hard handover are specified in [16].

When the UE receives a RRC message implying TDD/TDD handover with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCH within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCH at the designated activation time + interruption time.

where:

– D_handover equals the RRC procedure performance value defined in [16] plus the interruption time stated in section 5.1.2.2.3.

5.1.2.2 Interruption time

5.1.2.2.1 3.84 Mcps TDD option

The interruption time i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE starts transmission of the new uplink DPCH, is dependent on whether the target cell is known for the UE or not.

If TDD/TDD intra-frequency or inter-frequency handover is commanded, the interruption time shall be less than,

T_interrupt= T_offset+T_UL+30*F_SFN+20*KC+180*UC+10*F_max ms

where,

T_offset Equal to 10 ms, the frame timing uncertainty between the old cell and the target cell and the time that can elapse until the appearance of a Beacon channel

T_UL Equal to 10 ms, the time that can elapse until the appearance of the UL timeslot in the target cell

F_SFN Equal to 1 if SFN decoding is required and equal to 0 otherwise

KC Equal to 1 if a known target cell is indicated in the RRC message implying TDD/TDD handover and equal to 0 otherwise

UC Equal to 1 if an unknown target cell is indicated in the RRC message implying TDD/TDD handover and equal to 0 otherwise

F_max denotes the maximum number of radio frames within the transmission time intervals of all transport channels that are multiplexed into the same CCTrCH.

An intra-frequency or inter-frequency TDD target cell shall be considered as known by the UE, if either or both of the following conditions are true:

– the target cell has been measured during the last 5 seconds

– the UE has had a radio link connected to the target cell during the last 5 seconds.

The interruption time requirements for an unknown target cell shall apply only if the signal quality of the unknown target cell is sufficient for successful synchronisation with one attempt.

5.1.2.2.2 1.28 Mcps TDD option

The interruption time i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE starts transmission of the new uplink DPCH or the SYNC-UL in case that a handover with SYNCH uplink exchange is recommended, shall be less than the value defined in the equation below. There is different requirement on the interruption time depending on if the cell is known or not and if the SFN of the target cell has to be decoded by the UE or not.

If TDD/TDD intra-frequency or inter-frequency handover is commanded, the interruption time shall be less than,

T_interrupt= T_offset+T_UL+30*F_SFN+20*KC+180*UC+10*F_max ms

where,

T_offset Equal to 10 ms, the frame timing uncertainty between the old cell and the target cell and the time that can elapse until the appearance of a Beacon channel

T_UL Equal to 10 ms, the time that can elapse until the appearance of the UL timeslot in the target cell

F_SFN Equal to 1 if SFN decoding is required and equal to 0 otherwise

KC Equal to 1 if a known target cell is indicated in the RRC message implying TDD/TDD handover and equal to 0 otherwise

UC Equal to 1 if an unknown target cell is indicated in the RRC message implying TDD/TDD handover and equal to 0 otherwise

F_max denotes the maximum number of radio frames within the transmission time intervals of all transport channels that are multiplexed into the same CCTrCH.

A cell shall be regarded as known by the UE if either or both of the following conditions are true:

– it has been measured during the last 5 seconds or

– a dedicated connection existed between the UE and the cell during the last 5 seconds.

The SFN of the target cell needs not to be decoded by the UE if either or both of the following conditions are true:

– a handover with timing maintain is commanded by the UTRAN or

– the SFN of the target cell is known by the UE.

The interruption time requirement for the cell shall apply if the signal quality of the unknown cell is good enough for successful synchronisation with one attempt.

5.1.2.2.3 7.68 Mcps TDD option

The interruption time i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE starts transmission of the new uplink DPCH, is dependent on whether the target cell is known for the UE or not.

If TDD/TDD intra-frequency or inter-frequency handover is commanded, the interruption time shall be less than,

T_interrupt= T_offset+T_UL+30*F_SFN+20*KC+180*UC+10*F_max ms

where,

T_offset Equal to 10 ms, the frame timing uncertainty between the old cell and the target cell and the time that can elapse until the appearance of a Beacon channel

T_UL Equal to 10 ms, the time that can elapse until the appearance of the UL timeslot in the target cell

F_SFN Equal to 1 if SFN decoding is required and equal to 0 otherwise

KC Equal to 1 if a known target cell is indicated in the RRC message implying TDD/TDD handover and equal to 0 otherwise

UC Equal to 1 if an unknown target cell is indicated in the RRC message implying TDD/TDD handover and equal to 0 otherwise

F_max denotes the maximum number of radio frames within the transmission time intervals of all transport channels that are multiplexed into the same CCTrCH.

An intra-frequency or inter-frequency TDD target cell shall be considered as known by the UE, if either or both of the following conditions are true:

– the target cell has been measured during the last 5 seconds

– the UE has had a radio link connected to the target cell during the last 5 seconds.

The interruption time requirements for an unknown target cell shall apply only if the signal quality of the unknown target cell is sufficient for successful synchronisation with one attempt.

5.2 TDD/FDD Handover

5.2.1 Introduction

5.2.1.1 3.84 Mcps TDD option

The purpose of TDD/FDD handover is to change the radio access mode from TDD to FDD. The TDD/FDD handover procedure is initiated from UTRAN with a RRC message that implies a hard handover as described in [16].

5.2.1.2 1.28 Mcps TDD option

The purpose of TDD/FDD handover is to change the radio access mode from TDD to FDD.

The TDD/FDD handover procedure is initiated from UTRAN with a RRC message that implies a hard handover as described in [16]

5.2.1.3 7.68 Mcps TDD option

The purpose of TDD/FDD handover is to change the radio access mode from TDD to FDD. The TDD/FDD handover procedure is initiated from UTRAN with a RRC message that implies a hard handover as described in [16].

5.2.2 Requirements

The requirements in this section shall apply to UE supporting TDD and FDD.

5.2.2.1 TDD/FDD handover delay

5.2.2.1.1 3.84 Mcps TDD option

RRC procedure performance values for all RRC procedures that can command a hard handover, are specified in [16].

When the UE receives a RRC message implying TDD/FDD handover with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCCH within RRC procedure delay seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than D_handover seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCCH at the designated activation time + interruption time.

where:

D_handover equals the RRC procedure performance value as defined in [16] plus the interruption time stated in section 5.2.2.2.

5.2.2.1.2 1.28 Mcps TDD option

RRC procedure performance values for all RRC procedures that can command a hard handover, are specified in [16].

When the UE receives a RRC message that implies a TDD/FDD handover, with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCCH within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCCH at the designated activation time + interruption time.

D_handover equals the RRC procedure performance value defined in [16] plus the interruption time stated in section 5.2.2.2.2.

5.2.2.1.3 7.68 Mcps TDD option

RRC procedure performance values for all RRC procedures that can command a hard handover, are specified in [16].

When the UE receives a RRC message implying TDD/FDD handover with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCCH within RRC procedure delay seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than D_handover seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink DPCCH at the designated activation time + interruption time.

where:

– D_handover equals the RRC procedure performance value as defined in [16] plus the interruption time stated in section 5.2.2.2.3.

5.2.2.2 Interruption time

5.2.2.2.1 3.84 Mcps TDD option

The interruption time, i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE starts transmission of the new uplink DPCCH, is dependent on whether the target cell is known for the UE or not.

If TDD/FDD handover is commanded, the interruption time shall be less than,

T_interrupt= T_offset+40+50*KC+150*UC+10*F_max ms

where,

T_offset Equal to 10 ms, the frame timing uncertainty between the old cell and the target cell.

KC Equal to 1 if a known target cell is indicated in the RRC message implying TDD/FDD handover and equal to 0 otherwise

UC Equal to 1 if an unknown target cell is indicated in the RRC message implying TDD/FDD handover and equal to 0 otherwise

F_max denotes the maximum number of radio frames within the transmission time intervals of all transport channels that are multiplexed into the same CCTrCH.

An inter-frequency FDD target cell shall be considered known by the UE, if the target cell has been measured by the UE during the last 5 seconds.

The phase reference is the Primary CPICH.

The interruption time requirements for an unknown target cell shall apply only if the signal quality of the unknown target cell is sufficient for successful synchronisation with one attempt.

Note that the requirements in this section assume that N312 has the smallest possible value, i.e. only one in-sync indication as described in [23] is required.

5.2.2.2.2 1.28 Mcps TDD option

The interruption time, i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE starts transmission of the new uplink DPCCH, is dependent on whether the target cell is known for the UE or not.

If TDD/FDD handover is commanded, the interruption time shall be less than,

T_interrupt= T_IU+40+50*KC+150*UC+10*F_max ms

where,

T_IU The interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

KC Equal to 1 if a known target cell is indicated in the RRC message implying 1.28Mcps TDD/FDD handover and equal to 0 otherwise.

UC Equal to 1 if an unknown target cell is indicated in the RRC message implying 1.28Mcps TDD/FDD handover and equal to 0 otherwise.

F_max denotes the maximum number of radio frames within the transmission time intervals of all transport channels that are multiplexed into the same CCTrCH.

An inter-frequency FDD target cell shall be considered known by the UE, if the target cell has been measured by the UE during the last 5 seconds.

The phase reference is the Primary CPICH.

The interruption time requirements for an unknown target cell shall apply only if the signal quality of the unknown target cell is sufficient for successful synchronisation with one attempt.

Note that the requirements in this section assume that N312 has the smallest possible value, i.e. only one in-sync indication as described in [23] is required.

5.2.2.2.3 7.68 Mcps TDD option

The interruption time, i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE starts transmission of the new uplink DPCCH, is dependent on whether the target cell is known for the UE or not.

If TDD/FDD handover is commanded, the interruption time shall be less than,

T_interrupt= T_offset+40+50*KC+150*UC+10*F_max ms

where,

T_offset Equal to 10 ms, the frame timing uncertainty between the old cell and the target cell.

KC Equal to 1 if a known target cell is indicated in the RRC message implying TDD/FDD handover and equal to 0 otherwise

UC Equal to 1 if an unknown target cell is indicated in the RRC message implying TDD/FDD handover and equal to 0 otherwise

F_max denotes the maximum number of radio frames within the transmission time intervals of all transport channels that are multiplexed into the same CCTrCH.

An inter-frequency FDD target cell shall be considered known by the UE, if the target cell has been measured by the UE during the last 5 seconds.

The phase reference is the Primary CPICH.

The interruption time requirements for an unknown target cell shall apply only if the signal quality of the unknown target cell is sufficient for successful synchronisation with one attempt.

Note that the requirements in this section assume that N312 has the smallest possible value, i.e. only one in-sync indication as described in [23] is required.

5.3 TDD/GSM Handover

5.3.1 Introduction

5.3.1.1 3.84 Mcps TDD option

The purpose of inter-RAT handover from UTRAN TDD to GSM is to transfer a connection between the UE and UTRAN TDD to GSM. The handover procedure is initiated from UTRAN with a RRC message (HANDOVER FROM UTRAN COMMAND) as described in [16].

5.3.1.2 1.28 Mcps TDD option

The purpose of inter-RAT handover from UTRAN TDD to GSM is to transfer a connection between the UE and UTRAN TDD to GSM. The handover procedure is initiated from UTRAN with a RRC message (HANDOVER FROM UTRAN COMMAND). The procedure is described in [16]

5.3.1.3 7.68 Mcps TDD option

The purpose of inter-RAT handover from UTRAN TDD to GSM is to transfer a connection between the UE and UTRAN TDD to GSM. The handover procedure is initiated from UTRAN with a RRC message (HANDOVER FROM UTRAN COMMAND) as described in [16].

5.3.2 Requirements

The requirements in this section shall apply to UE supporting TDD and GSM.

5.3.2.1 TDD/GSM handover delay

5.3.2.1.1 3.84 Mcps TDD option

The RRC procedure performance value for the RRC HANDOVER FROM UTRAN COMMAND shall be 50 ms.

If the activation time is used in the RRC HANDOVER FROM UTRAN COMMAND, it corresponds to the CFN of the UTRAN channel.

When the UE receives a RRC HANDOVER FROM UTRAN COMMAND with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to transmit as specified [22] on the new channel of the new RAT within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to transmit as specified in [22] on the new channel of the new RAT at the designated activation time + interruption time.

D_handover equals the RRC procedure performance value plus the interruption time stated in section 5.3.2.2.

5.3.2.1.2 1.28 Mcps TDD option

The RRC procedure performance value for the RRC HANDOVER FROM UTRAN COMMAND shall be within 50 ms.

If the activation time is used in the RRC HANDOVER FROM UTRAN COMMAND, it corresponds to the CFN of the UTRAN channel.

When the UE receives a RRC HANDOVER FROM UTRAN COMMAND with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to transmit as specified in [22] on the new channel within the new RAT within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to transmit as specified in [22] on the new channel of the new RAT at the designated activation time + interruption time.

D_handover equals the RRC procedure performance value (50 ms) plus the interruption time stated in section 5.3.2.2.2.

5.3.2.1.3 7.68 Mcps TDD option

The RRC procedure performance value for the RRC HANDOVER FROM UTRAN COMMAND shall be 50 ms.

If the activation time is used in the RRC HANDOVER FROM UTRAN COMMAND, it corresponds to the CFN of the UTRAN channel.

When the UE receives a RRC HANDOVER FROM UTRAN COMMAND with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to transmit as specified [22] on the new channel of the new RAT within D_handover seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to transmit as specified in [22] on the new channel of the new RAT at the designated activation time + interruption time.

D_handover equals the RRC procedure performance value plus the interruption time stated in section 5.3.2.2.

5.3.2.2 Interruption time

5.3.2.2.1 3.84 Mcps TDD option

The interruption time, i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE is ready to transmit on the new channel of the new RAT, is dependent on whether the UE has synchonised to the target cell or not before receiving the RRC HANDOVER FROM UTRAN COMMAND.

The interruption time for the purpose of TDD/GSM handover shall be less than the value in Table 5.4.

Table 5.4: TDD/GSM interruption time

Synchronisation status	Interruption time [ms]
The UE has synchronised to the GSM cell before the HANDOVER FROM UTRAN COMMAND is received	40
The UE has not synchronised to the GSM cell before the HANDOVER FROM UTRAN COMMAND is received	140

The requirements in Table 5.4 for the case where the UE has not synchronised to the GSM target cell before receiving the RRC HANDOVER FROM UTRAN COMMAND shall apply only if the signal quality of the GSM target cell is sufficient for successful synchronisation with one attempt.

If the UE is unable to synchronise to the GSM cell on the first attempt, it shall continue to search for synchronisation information for up to 800 ms. If after 800 ms the UE has not synchronised to the GSM cell it shall follow the handover failure procedure specified in [16].

5.3.2.2.2 1.28 Mcps TDD option

The interruption time, i.e. the time between the end of last TTI containing a transport block on the old DPCH and the time the UE is ready to transmit on the new channel of the new RAT, is dependent on whether the UE has synchonised to the target cell or not before receiving the RRC HANDOVER FROM UTRAN COMMAND.

The interruption time for the purpose of TDD/GSM handover shall be less than the value in Table 5.4A.

Table 5.4A: TDD/GSM interruption time

Synchronisation status	Interruption time [ms]
The UE has synchronised to the GSM cell before the HANDOVER FROM UTRAN COMMAND is received	40
The UE has not synchronised to the GSM cell before the HANDOVER FROM UTRAN COMMAND is received	140

The requirements in Table 5.4A for the case where the UE has not synchronised to the GSM target cell before receiving the RRC HANDOVER FROM UTRAN COMMAND shall apply only if the signal quality of the GSM target cell is sufficient for successful synchronisation with one attempt.

If the UE is unable to synchronise to the GSM cell on the first attempt, it shall continue to search for synchronisation information for up to 800 ms. If after 800 ms the UE has not synchronised to the GSM cell it shall follow the handover failure procedure specified in [16].

5.3.2.2.3 7.68 Mcps TDD option

The interruption time, i.e. the time between the end of the last TTI containing a transport block on the old DPCH and the time the UE is ready to transmit on the new channel of the new RAT, is dependent on whether the UE has synchonised to the target cell or not before receiving the RRC HANDOVER FROM UTRAN COMMAND.

The interruption time for the purpose of TDD/GSM handover shall be less than the value in Table 5.4B.

Table 5.4B: TDD/GSM interruption time

Synchronisation status	Interruption time [ms]
The UE has synchronised to the GSM cell before the HANDOVER FROM UTRAN COMMAND is received	40
The UE has not synchronised to the GSM cell before the HANDOVER FROM UTRAN COMMAND is received	140

The requirements in Table 5.4B for the case where the UE has not synchronised to the GSM target cell before receiving the RRC HANDOVER FROM UTRAN COMMAND shall apply only if the signal quality of the GSM target cell is sufficient for successful synchronisation with one attempt.

If the UE is unable to synchronise to the GSM cell on the first attempt, it shall continue to search for synchronisation information for up to 800 ms. If after 800 ms the UE has not synchronised to the GSM cell it shall follow the handover failure procedure specified in [16].

5.3a TDD to E-UTRAN FDD Handover

5.3a.1 Introduction

The purpose of inter-RAT handover from UTRAN TDD to E-UTRAN FDD is to transfer a connection between the UE and UTRAN TDD to E-UTRAN FDD. The handover procedure is initiated from UTRAN with a RRC message (HANDOVER FROM UTRAN COMMAND). The procedure is described in TS 25.331.

Scheduled idle intervals according to the UE capability may be used to be able to make measurements on E-UTRAN.

5.3a.2 Requirements

The requirements in this section shall apply to UE supporting TDD and E-UTRAN FDD.

5.3a.2.1 Handover delay

When the UE receives a RRC HANDOVER FROM UTRAN COMMAND message with activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink PRACH channel within D_handover seconds from the end of the last TTI containing the RRC command, where:

– D_handover equals the maximum RRC procedure delay defined plus the interruption time stated in section 5.3a.2.2.

The UE shall process the RRC procedures for the RRC HANDOVER FROM UTRAN COMMAND within 50 ms, which is noted as RRC procedure delay.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink PRACH channel at the designated activation time + interruption time.

5.3a.2.2 Interruption time

The interruption time is the time between end of the last TTI in which the UE has received the handover command and the time the UE starts transmission of the PRACH in the new E-UTRA cell, excluding the RRC procedure delay. This requirement applies when UE is not required to perform any synchronisation procedure before transmitting on the new PRACH.

When inter-RAT handover to E-UTRAN is commanded, the interruption time shall be less than Tinterrupt:

Tinterrupt = T_search + T_IU + 20 ms

where

T_search is the time required to search the target cell when the target cell is not already known when the handover command is received by the UE. If the target cell is known, then T_search = 0 ms. If the target cell is unknown and signal quality is sufficient for successful cell detection on the first attempt, then T_search = 80 ms.

T_IU is the interruption uncertainty in acquiring the first available PRACH occasion in the new cell. T_IU can be up to 30 ms.

NOTE: The actual value of T_IU shall depend upon the PRACH configuration used in the target cell.

In the interruption requirement a cell is known if it has been meeting the relevant cell identification requirement during the last 5 seconds otherwise it is unknown. Relevant cell identification requirements are described in Section 8.1.2.7.1 for 3.84 Mcps TDD option and Section 8.1A.2.6.1 for 1.28 Mcps TDD option and Section 8.1B.2.7.1 for 7.68 Mcps TDD option.

5.3b TDD to E-UTRAN TDD Handover

5.3b.1 Introduction

The purpose of inter-RAT handover from UTRAN TDD to E-UTRAN TDD is to transfer a connection between the UE and UTRAN TDD to E-UTRAN TDD. The handover procedure is initiated from UTRAN with a RRC message (HANDOVER FROM UTRAN COMMAND). The procedure is described in TS 25.331.

Scheduled idle intervals according to the UE capability may be used to be able to make measurements on E-UTRAN.

5.3b.2 Requirements

The requirements in this section shall apply to UE supporting TDD and E-UTRAN TDD.

5.3b.2.1 Handover delay

When the UE receives a RRC HANDOVER FROM UTRAN COMMAND message with activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink PRACH channel within D_handover seconds from the end of the last TTI containing the RRC command, where:

– D_handover equals the maximum RRC procedure delay defined plus the interruption time stated in section 5.3b.2.2.

The UE shall process the RRC procedures for the RRC HANDOVER FROM UTRAN COMMAND within 50 ms, which is noted as RRC procedure delay.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink PRACH channel at the designated activation time + interruption time.

5.3b.2.2 Interruption time

The interruption time is the time between end of the last TTI in which the UE has received the handover command and the time the UE starts transmission of the PRACH in the new E-UTRA cell, excluding the RRC procedure delay. This requirement applies when UE is not required to perform any synchronisation procedure before transmitting on the new PRACH.

When inter-RAT handover to E-UTRAN is commanded, the interruption time shall be less than T_interrupt:

T_interrupt = T_search + T_IU + 20 ms

where

T_search is the time required to search the target cell when the target cell is not already known when the handover command is received by the UE. If the target cell is known, then T_search = 0 ms. If the target cell is unknown and signal quality is sufficient for successful cell detection on the first attempt, then T_search = 80 ms.

T_IU is the interruption uncertainty in acquiring the first available PRACH occasion in the new cell. T_IU can be up to 30 ms.

NOTE: The actual value of T_IU shall depend upon the PRACH configuration used in the target cell.

In the interruption requirement a cell is known if it has been meeting the relevant cell identification requirement during the last 5 seconds otherwise it is unknown. Relevant cell identification requirements are described in Section 8.1.2.8.1 for 3.84 Mcps TDD option and Section 8.1A.2.7.1 for 1.28 Mcps TDD option and Section 8.1B.2.8.1 for 7.68 Mcps TDD option.

5.4 Cell Re-selection in Cell_FACH

5.4.1 Introduction

The UE shall evaluate the cell re-selection criteria specified in [18], based on radio measurements, and if a better ranked cell is found that cell is selected.

5.4.2 Requirements for 3.84Mcps TDD option

The cell re-selection delays specified below are applicable when the RRC parameter T_reselection is set to 0. Otherwise the Cell reselection delay is increased by T_reselection s.

P-CCPCH RSCP shall be used for cell reselection in Cell-FACH state to another TDD cell, CPICH Ec/Io and CPICH RSCP shall be used for cell re-selection to a FDD cell and GSM carrier RSSI shall be used for cell re-selection to a GSM cell. The accuracies of the measurements used for cell re-selection in an AWGN environment shall comply with the requirements in chapter 9. The measurements used for S-criteria and cell re-selection evaluation in CELL_FACH state shall be performed according to section 8.4.

5.4.2.1 Cell re-selection delay

For UTRA TDD, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger the cell re-selection process and the moment in time when the UE starts sending the RRC CELL UPDATE message to the UTRAN on RACH.

For UTRA FDD, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger the cell re-selection process and the moment in time when the UE starts sending the the preambles on the PRACH for sending RRC CELL UPDATE message to the UTRAN.

For GSM, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger Cell Reselection process and the moment in time when the UE starts sending the random access in the target cell of the new RAT.

These requirements assume radio conditions to be sufficient, so that reading of system information can be done without errors.

5.4.2.1.1 Intra-frequency cell re-selection

The cell re-selection delay in CELL_FACH state for intra frequency TDD cells shall be less than:

ms

where

T_{identify, intra} is specified in 8.4.2.2.1.

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

If a cell has been detectable at least T_{identify,intra}, the cell re-selection delay in CELL_FACH state to an intra-frequency TDD cell shall be less than,

ms

where

T_{measurement period intra} is specified in 8.4.2.2.2.

5.4.2.1.2 Inter-frequency cell re-selection

The cell re-selection delay in CELL_FACH state for inter-frequency TDD cells shall be less than:

ms

where

T_{identify, inter} is specified in 8.4.2.3.1.

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

If a cell has been detectable at least T_{identify,inter}, the cell re-selection delay in CELL_FACH state to an inter-frequency TDD cell shall be less than,

ms

where

T_{measurement inter} is specified in 8.4.2.3.2.

5.4.2.1.3 TDD FDD cell re-selection

The requirements in this section shall apply to UE supporting TDD and FDD.

The cell re-selection delay in CELL_FACH state to an inter-frequency FDD cells shall be less than:

ms

where

T_{identify, FDD} is specified in 8.4.2.4.1

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

If a cell has been detectable at least T_{identify FDD inter}, the cell re-selection delay in CELL_FACH state to an inter-frequency FDD cell shall be less than,

ms

where

T_{measurement FDD inter} is specified in 8.4.2.4.1.

5.4.2.1.4 Inter-RAT cell re-selection

The requirements in this section shall apply to UE supporting TDD and GSM.

The cell re-selection delay in CELL_FACH state for inter-RAT cells shall be less than:

ms

where

T_BCCH is the maximum time allowed to read the BCCH data from a GSM cell [21].

T_RA is the additional delay caused by the random access procedure.

a) For a UE using measurement occasions and idle intervals to perform GSM measurements

T_{identify, GSM} equal to T_{identify about} as is specified in 8.4.2.5.2.1.

where

N_carriersis the number of GSM carriers in the Inter-RAT cell info list

N_{GSM carrier RSSI} shall be derived from the values in table 8.7 section 8.4.2.5.1.

T_meas is specified in section 8.4.2.1.

b) For a UE not using measurement occasions and idle intervals to perform GSM measurements

T_{identify GSM} = 150 ms

T_{measurement GSM} = 480 ms

5.4.2.2 Interruption time

For UTRA TDD, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts to transmit the RRC CELL UPDATE message to the UTRAN on the RACH.

For UTRA FDD, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts sending preambles on the PRACH for sending the RRC CELL UPDATE message to the UTRAN.

For GSM, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts sending the random access in the target cell of the new RAT.

The requirements on interruption time in this section shall apply only if the signal quality of the serving cell is sufficient to allow decoding of the FACH during cell-re-selection.

5.4.2.2.1 TDD-TDD cell re-selection

In case of cell reselection to an intra-frequency TDD cell or cell re-selection to an inter-frequency TDD cell and when the UE does not need measurement occasions to perform TDD inter-frequency measurements, the interruption time shall be less than,

Tinterrupt1 = T_IU+20+T_RA ms

In case of cell re-selection to an inter-frequency TDD cell and when the UE needs measurement occasions to perform inter-frequency TDD measurements, the interruption time shall be less than

Tinterrupt2 = T_IU+20+T_SI+T_RA ms

where

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16].

T_RA is the additional delay caused by the random access procedure.

5.4.2.2.2 TDD-FDD cell re-selection

The requirements in this section shall apply to UE supporting TDD and FDD.

In case of cell re-selection to an inter-frequency FDD cell and when the UE does not need measurement occasions to perform inter-frequency FDD measurements, the interruption time shall be less than,

Tinterrupt1, FDD = T_IU+20+T_RA ms

In case of cell re-selection to an inter-frequency TDD cell and when the UE needs measurement occasions to perform inter-frequency TDD measurements, the interruption time shall be less than

Tinterrupt2, FDD = T_IU+20+T_SI+T_RA ms

where

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16].

T_RA is the additional delay caused by the random access procedure.

5.4.2.2.3 TDD-GSM cell re-selection

The requirements in this section shall apply to UE supporting TDD and GSM.

In case of cell re-selection to an inter-RAT cell, the interruption time shall be less than,

Tinterrupt,GSM = 40 +T_BCCH+T_RA ms

where

T_BCCH is the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA is the additional delay caused by the random access procedure.

5.4.2.3 Measurement and evaluation of cell selection criteria S of serving cell

The S-criteria detection delay is defined as the time between the occurrence of an event which leads to that the cell selection criteria S for serving cell is not fulfilled and the moment in time when the UE detects that the cell selection criteria S for serving cell is not fulfilled.

The UE shall filter the P-CCPCH RSCP measurements used for cell selection criteria S evaluation of the serving cell over at least 3 measurement periods T_{Measurement period intra}.

The S-critera detection delay in CELL_FACH state shall be less than:

ms

where

T_{measurement period intra} is specified in 8.4.2.2.2.

If the UE has evaluated that the serving cell does not fulfil the cell selection criterion S during 4 s and if during this time period the UE has not found any new suitable cell based on measurements of neighbour cells as indicated in the measurement control system information, the UE shall consider having detected "out of service area" and initiate actions according to [16] and [18].

On transition from CELL_DCH to CELL_FACH, if a UE cannot find a suitable UTRA cell, then it is considered to be "out of service area" and shall perform actions according to [16].

5.4.3 Requirements for 1.28Mcps TDD option

The cell re-selection delays specified below are applicable when the RRC parameter T_reselection is set to 0. Otherwise the Cell reselection delay is increased by T_reselection s.

P-CCPCH RSCP shall be used for cell reselection in Cell-FACH state to another TDD cell, CPICH RSCP and if requested in addition CPICH Ec/Io shall be used for cell re-selection to a FDD cell and GSM BCCH carrier RSSI shall be used for cell re-selection to a GSM cell. The accuracies of the measurements used for cell re-selection in an AWGN environment shall comply with the requirements in chapter 9. The measurements used for S-criteria and cell re-selection evaluation in CELL_FACH state shall be performed according to section 8.4A.

NOTE: In CELL_FACH state, there are no requirements for inter-RAT reselection to an E-UTRAN cell.

5.4.3.1 Measurements

The UE measurement capability according to section 8.4A shall apply.

5.4.3.2 Cell re-selection delay

For cell re-selection to TDD, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger Cell Reselection process and the moment in time when the UE starts to send SYNCH-UL sequence for sending the RRC CELL UPDATE message to the UTRAN.

For cell re-selection to FDD the cell re-selection delay is defined as the time between the occurrence of an event which will trigger Cell Reselection process and the moment in time when the UE starts sending the preambles on the PRACH for sending RRC CELL UPDATE message to the UTRAN.

For cell re-selection to GSM the cell re-selection delay is defined as the time between the occurrence of an event which will trigger Cell Reselection process and the moment in time when the UE starts sending the random access in the target cell of the new RAT.

5.4.3.2.1 Intra-frequency cell re-selection

The cell re-selection delay in CELL_FACH state to an intra frequency cell shall be less than:

ms

If a cell has been detectable at least for T_{identify,intra}, the cell re-selection delay in CELL_FACH state to an intra frequency cell shall be less than:

ms

where

T_{identify intra} is specified in 8.4A.2.2.1

T_{Measurement Period Intra} is specified in 8.4A.2.2.2

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure delay of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

This requirement assumes radio conditions to be sufficient, so reading of system information can be done without errors.

5.4.3.2.2 Inter-frequency TDD cell re-selection

The cell re-selection delay in CELL_FACH state to an inter-frequency TDD cell shall be less than:

ms

If a cell has been detectable at least for T_{identify,inter}, the cell re-selection delay in CELL_FACH state to an inter frequency cell shall be less than:

ms

where

T_{identify inter} is specified in 8.4A.2.3.1

T_{measurement inter} is specified in 8.4A.2.3.2

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure delay of system information blocks defined in 25.331 for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

This requirement assumes radio conditions to be sufficient, so reading of system information can be done without errors.

5.4.3.2.3 Inter-frequency FDD cell re-selection

The requirements in this section shall apply to UE supporting both 1.28 Mcps TDD and FDD.

The cell re-selection delay in CELL_FACH state to a FDD cell shall be less than:

ms

If a cell has been detectable at least T_{identify FDD inter}, the cell re-selection delay in CELL_FACH state to FDD cell shall be less than:

ms

where

T_{identify FDD inter} is specified in 8.4A.2.4.1

T_{measurement FDD inter} is specified in 8.4A.2.4.1.

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure delay of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

This requirement assumes radio conditions to be sufficient, so reading of system information can be done without errors.

5.4.3.2.4 Inter-RAT cell re-selection

The requirements in this section shall apply to UE supporting both 1.28 Mcps TDD and GSM.

The cell re-selection delay in CELL_FACH state to an inter-RAT cell shall be less than:

ms

T_RA = The additional delay caused by the random access procedure.

T_BCCH = The maximum time allowed to read BCCH data from GSM cell [21].

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

where

a) For UE requiring idle intervals or measurement occasions:

T_{identify GSM} is equal to T_{identify abort} as specified in 8.4A.2.5.2.1.

T_{Measurement GSM} is the worst case time for measuring one previously identified GSM carrier.

where

N_carriers is the number of GSM carriers in the Inter-RAT cell info list

N_{GSM carrier RSSI} is specified in section 8.4A.2.5.1.

T_meas is specified in section 8.4A.2.1.

b) For UE not requiring idle intervals and measurement occasions

T_{identify, GSM} = 150 ms

T_{Measurement, GSM} = 480 ms

This requirement assumes radio conditions to be sufficient, so reading of system information can be done without errors.

5.4.3.3 Interruption time

For UTRA TDD, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts to transmit the SYNC-UL sequence in the UpPTS for sending the RRC CELL UPDATE message to the UTRAN.

For UTRA FDD, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts sending preambles on the PRACH for sending the RRC CELL UPDATE message to the UTRAN.

For GSM, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts sending the random access in the target cell of the new RAT.

The requirements on interruption time in this section shall apply only if the signal quality of the serving cell is sufficient to allow decoding of the FACH during cell-re-selection.

5.4.3.3.1 TDD-TDD cell re-selection

In case of cell re-selection to a TDD cell, the interruption time shall be less than

T_{interrupt, TDD} = T_IU+20+T_SI+T_RA +T_CSI ms

where

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16].

T_RA is the additional delay caused by the random access procedure.

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

5.4.3.3.2 TDD-FDD cell re-selection

The requirements in this section shall apply to UE supporting both 1.28 Mcps TDD and FDD.

In case of cell re-selection to a FDD cell, the interruption time shall be less than

T_{interrupt, FDD} = T_IU+20+T_SI+T_RA +T_CSI ms

where

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16].

T_RA is the additional delay caused by the random access procedure.

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

5.4.3.3.3 TDD-GSM cell re-selection

The requirements in this section shall apply to UE supporting both 1.28 Mcps TDD and GSM.

In case of cell re-selection to an inter-RAT cell, the interruption time shall be less than

T_{interrupt,GSM} = 40 +T_BCCH+T_RA +T_CSI ms

where

T_BCCH is the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA is the additional delay caused by the random access procedure.

T_CSI is the additional delay in case the cell re-selection indication shall be sent in enhanced CELL_FACH state. T_CSI can be up to one sub frame (5ms) or the delay caused by the random access procedure (T_RA).

5.4.3.4 Measurement and evaluation of cell selection criteria S of serving cell

The S-criteria detection delay is defined as the time between the occurrence of an event which leads to that the cell selection criteria S for serving cell is not fulfilled and the moment in time when the UE detects that the cell selection criteria S for serving cell is not fulfilled.

The UE shall filter the P-CCPCH RSCP measurements used for cell selection criteria S evaluation of the serving cell over at least 3 measurement periods T_{Measurement_Period Intra}.

The S-critera detection delay in CELL_FACH state shall be less than:

ms

where T_{Measurement_Period Intra} is specified in 8.4A.2.2.2.

The UE is "out of service area" if the UE has evaluated for 4 s that the serving cell does not fulfil the cell selection criterion S and if the UE has not found any new suitable cell based on searches and measurements of the neighbour cells indicated in the measurement control system information during these 4 s. When the UE is "out of service area" it shall initiate cell selection procedures for the selected PLMN as defined in [18].

On transition from CELL_DCH to CELL_FACH, if a UE cannot find a suitable UTRA cell, then it is considered to be "out of service area" and shall perform actions according to [16].

5.4.4 Requirements for 7.68Mcps TDD option

The cell re-selection delays specified below are applicable when the RRC parameter T_reselection is set to 0. Otherwise the Cell reselection delay is increased by T_reselection s.

P-CCPCH RSCP shall be used for cell reselection in Cell-FACH state to another TDD cell, CPICH Ec/Io and CPICH RSCP shall be used for cell re-selection to a FDD cell and GSM carrier RSSI shall be used for cell re-selection to a GSM cell. The accuracies of the measurements used for cell re-selection in an AWGN environment shall comply with the requirements in chapter 9. The measurements used for S-criteria and cell re-selection evaluation in CELL_FACH state shall be performed according to section 8.4B.

5.4.4.1 Cell re-selection delay

For UTRA TDD, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger the cell re-selection process and the moment in time when the UE starts sending the RRC CELL UPDATE message to the UTRAN on RACH.

For UTRA FDD, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger the cell re-selection process and the moment in time when the UE starts sending the the preambles on the PRACH for sending RRC CELL UPDATE message to the UTRAN.

For GSM, the cell re-selection delay is defined as the time between the occurrence of an event which will trigger Cell Reselection process and the moment in time when the UE starts sending the random access in the target cell of the new RAT.

These requirements assume radio conditions to be sufficient, so that reading of system information can be done without errors.

5.4.4.1.1 Intra-frequency cell re-selection

The cell re-selection delay in CELL_FACH state for intra frequency TDD cells shall be less than:

ms

where

T_{identify, intra} is specified in 8.4B.2.2.1.

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

If a cell has been detectable at least T_{identify,intra}, the cell re-selection delay in CELL_FACH state to an intra-frequency TDD cell shall be less than,

ms

where

T_{measurement period intra} is specified in 8.4B.2.2.2.

5.4.4.1.2 Inter-frequency cell re-selection

The cell re-selection delay in CELL_FACH state for inter-frequency TDD cells shall be less than:

ms

where

T_{identify, inter} is specified in 8.4B.2.3.1.

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

If a cell has been detectable at least T_{identify,inter}, the cell re-selection delay in CELL_FACH state to an inter-frequency TDD cell shall be less than,

ms

where

T_{measurement inter} is specified in 8.4B.2.3.2.

5.4.4.1.3 TDD FDD cell re-selection

The requirements in this section shall apply to UE supporting TDD and FDD.

The cell re-selection delay in CELL_FACH state to an inter-frequency FDD cells shall be less than:

ms

where

T_{identify, FDD} is specified in 8.4B.2.4.1

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16] for a UTRAN cell.

T_RA is the additional delay caused by the random access procedure.

If a cell has been detectable at least T_{identify FDD inter}, the cell re-selection delay in CELL_FACH state to an inter-frequency FDD cell shall be less than,

ms

where

T_{measurement FDD inter} is specified in 8.4B.2.4.1.

5.4.4.1.4 Inter-RAT cell re-selection

The requirements in this section shall apply to UE supporting TDD and GSM.

The cell re-selection delay in CELL_FACH state for inter-RAT cells shall be less than:

ms

where

T_BCCH is the maximum time allowed to read the BCCH data from a GSM cell [21].

T_RA is the additional delay caused by the random access procedure.

a) For a UE using measurement occasions and idle intervals to perform GSM measurements

T_{identify, GSM} equal to T_{identify about} as is specified in 8.4B.2.5.2.1.

where

N_carriersis the number of GSM carriers in the Inter-RAT cell info list

N_{GSM carrier RSSI} shall be derived from the values in section 8.4B.2.5.1.

T_meas is specified in section 8.4B.2.1.

b) For a UE not using measurement occasions and idle intervals to perform GSM measurements

T_{identify GSM} = 150 ms

T_{measurement GSM} = 480 ms

5.4.4.2 Interruption time

For UTRA TDD, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts to transmit the RRC CELL UPDATE message to the UTRAN on the RACH.

For UTRA FDD, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts sending preambles on the PRACH for sending the RRC CELL UPDATE message to the UTRAN.

For GSM, the interruption time is defined as the time period between the last TTI the UE monitors the FACH on the serving cell and the time instant the UE starts sending the random access in the target cell of the new RAT.

The requirements on interruption time in this section shall apply only if the signal quality of the serving cell is sufficient to allow decoding of the FACH during cell-re-selection.

5.4.4.2.1 TDD-TDD cell re-selection

In case of cell reselection to an intra-frequency TDD cell or cell re-selection to an inter-frequency TDD cell and when the UE does not need measurement occasions to perform TDD inter-frequency measurements, the interruption time shall be less than,

Tinterrupt1 = T_IU+20+T_RA ms

In case of cell re-selection to an inter-frequency TDD cell and when the UE needs measurement occasions to perform inter-frequency TDD measurements, the interruption time shall be less than

Tinterrupt2 = T_IU+20+T_SI+T_RA ms

where

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16].

T_RA is the additional delay caused by the random access procedure.

5.4.4.2.2 TDD-FDD cell re-selection

The requirements in this section shall apply to UE supporting TDD and FDD.

In case of cell re-selection to an inter-frequency FDD cell and when the UE does not need measurement occasions to perform inter-frequency FDD measurements, the interruption time shall be less than,

Tinterrupt1, FDD = T_IU+20+T_RA ms

In case of cell re-selection to an inter-frequency TDD cell and when the UE needs measurement occasions to perform inter-frequency TDD measurements, the interruption time shall be less than

Tinterrupt2, FDD = T_IU+20+T_SI+T_RA ms

where

T_IU is the interruption uncertainty when changing the timing from the old to the new cell. T_IU can be up to one frame (10 ms).

T_SI is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure performance value of system information blocks defined in [16].

T_RA is the additional delay caused by the random access procedure.

5.4.4.2.3 TDD-GSM cell re-selection

The requirements in this section shall apply to UE supporting TDD and GSM.

In case of cell re-selection to an inter-RAT cell, the interruption time shall be less than,

Tinterrupt,GSM = 40 +T_BCCH+T_RA ms

where

T_BCCH is the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA is the additional delay caused by the random access procedure.

5.4.4.3 Measurement and evaluation of cell selection criteria S of serving cell

The S-criteria detection delay is defined as the time between the occurrence of an event which leads to that the cell selection criteria S for serving cell is not fulfilled and the moment in time when the UE detects that the cell selection criteria S for serving cell is not fulfilled.

The UE shall filter the P-CCPCH RSCP measurements used for cell selection criteria S evaluation of the serving cell over at least 3 measurement periods T_{Measurement period intra}.

The S-critera detection delay in CELL_FACH state shall be less than:

ms

where

T_{measurement period intra} is specified in 8.4B.2.2.2.

If the UE has evaluated that the serving cell does not fulfil the cell selection criterion S during 4 s and if during this time period the UE has not found any new suitable cell based on measurements of neighbour cells as indicated in the measurement control system information, the UE shall consider having detected "out of service area" and initiate actions according to [16] and [18].

On transition from CELL_DCH to CELL_FACH, if a UE cannot find a suitable UTRA cell, then it is considered to be "out of service area" and shall perform actions according to [16].

5.5 Cell Re-selection in Cell_PCH

5.5.1 Introduction

The UE shall evaluate the cell re-selection criteria specified in [18], based on radio measurements, and if a better cell is found that cell is selected.

5.5.2 Requirements

5.5.2.1 3.84 Mcps option

Requirements for cell re-selection in Cell_PCH state are the same as for cell re-selection in idle mode, see section 4.2. The UE shall support all DRX cycle lengths in table 4.1, according to [16].

The UE shall consider having detected "out of service area" and initiate actions according to [16] and [18], if the serving cell does not fulfil the cell selection criterion S in N_serv consecutive DRX cycles and if during the following 12 s no new suitable cell based upon measurements of all neighbour cells indicated in the measurement control system information has been found.

5.5.2.2 1.28 Mcps option

Requirements for cell re-selection in Cell_PCH state are the same as for cell re-selection in idle mode, see section 4.2. The UE shall support all DRX cycle lengths in table 4.1A, according to [16].

5.5.2.3 7.68 Mcps option

Requirements for cell re-selection in Cell_PCH state are the same as for cell re-selection in idle mode, see section 4.2. The UE shall support all DRX cycle lengths in table 4.1B, according to [16].

The UE shall consider having detected "out of service area" and initiate actions according to [16] and [18], if the serving cell does not fulfil the cell selection criterion S in N_serv consecutive DRX cycles and if during the following 12 s no new suitable cell based upon measurements of all neighbour cells indicated in the measurement control system information has been found.

5.6 Cell Re-selection in URA_PCH

5.6.1 Introduction

The UE shall evaluate the cell re-selection criteria specified in [18], based on radio measurements, and if a better cell is found that cell is selected.

5.6.2 Requirements

5.6.2.1 3.84 Mcps option

Requirements for cell re-selection in URA_PCH state are the same as for cell re-selection in idle mode, see section 4.2. The UE shall support all DRX cycle lengths in table 4.1, according to [16].

The UE shall consider having detected "out of service area" and initiate actions according to [16] and [18], if the serving cell does not fulfil the cell selection criterion S in N_serv consecutive DRX cycles and if during the following 12 s no new suitable cell based upon measurements of all neighbour cells indicated in the measurement control system information has been found.

5.6.2.2 1.28 Mcps option

Requirements for cell re-selection in URA_PCH state are the same as for cell re-selection in idle mode, see section 4.2. The UE shall support all DRX cycle lengths in table 4.1A, according to [16].

5.6.2.3 7.68 Mcps option

Requirements for cell re-selection in URA_PCH state are the same as for cell re-selection in idle mode, see section 4.2. The UE shall support all DRX cycle lengths in table 4.1B, according to [16].

The UE shall consider having detected "out of service area" and initiate actions according to [16] and [18], if the serving cell does not fulfil the cell selection criterion S in N_serv consecutive DRX cycles and if during the following 12 s no new suitable cell based upon measurements of all neighbour cells indicated in the measurement control system information has been found.

5.7 RACH reporting

5.7.1 Introduction

5.7.1.1 3.84 Mcps TDD option

The network may request the UE to report on RACH P-CCPCH RSCP for the serving cell and up to 6 strongest monitored set cells and SFN-SFN observed time difference between the serving cell and up to 6 different monitored set cells.

5.7.1.2 1.28 Mcps TDD option

The network may request the UE to report on RACH P-CCPCH RSCP for the serving cell and up to 6 strongest monitored set cells and SFN-SFN observed time difference between the serving cell and up to 6 different monitored set cells.

5.7.1.3 7.68 Mcps TDD option

The network may request the UE to report on RACH P-CCPCH RSCP for the serving cell and up to 6 strongest monitored set cells and SFN-SFN observed time difference between the serving cell and up to 6 different monitored set cells.

5.7.2 Requirements

5.7.2.1 3.84 Mcps TDD option

If all of the following conditions are true, the UE is allowed to have an additional delay of N_RACH*50 ms in RACH transmission compared to the normal RACH transmission delay.

– SFN-SFN observed time difference measurement results are required to be reported on RACH

– The set of cells on which the SFN-SFN observed time difference measurement is to be reported has not changed since the previous RACH measurement report

– The UE has not measured the SFN-SFN observed time differences for the cells to be reported on RACH in the CELL_FACH state according to the requirements defined in Section 8.4.2.2

If at least one of the previous conditions is false, the UE shall be able to report the requested measurement results on RACH within a normal RACH transmission delay.

N_RACH is the number of cells requiring SFN decoding prior to the reporting of SFN-SFN observed time difference measurement results on RACH.

5.7.2.2 1.28 Mcps TDD option

If all of the following conditions are true, the UE is allowed to have an additional delay of N_RACH*50 ms in RACH transmission compared to the normal RACH transmission delay.

– SFN-SFN observed time difference measurement results are required to be reported on RACH

– The set of cells on which the SFN-SFN observed time difference measurement is to be reported has not changed since the previous RACH measurement report

– The UE has not measured the SFN-SFN observed time differences for the cells to be reported on RACH in the CELL_FACH state according to the requirements defined in Section 8.4A.2.2

If at least one of the previous conditions is false, the UE shall be able to report the requested measurement results on RACH within a normal RACH transmission delay.

N_RACH is the number of cells requiring SFN decoding prior to the reporting of SFN-SFN observed time difference measurement results on RACH.

5.7.2.3 7.68 Mcps TDD option

If all of the following conditions are true, the UE is allowed to have an additional delay of N_RACH*50 ms in RACH transmission compared to the normal RACH transmission delay.

– SFN-SFN observed time difference measurement results are required to be reported on RACH

– The set of cells on which the SFN-SFN observed time difference measurement is to be reported has not changed since the previous RACH measurement report

– The UE has not measured the SFN-SFN observed time differences for the cells to be reported on RACH in the CELL_FACH state according to the requirements defined in Section 8.4B.2.2

If at least one of the previous conditions is false, the UE shall be able to report the requested measurement results on RACH within a normal RACH transmission delay.

N_RACH is the number of cells requiring SFN decoding prior to the reporting of SFN-SFN observed time difference measurement results on RACH.

5.8 Inter-RAT cell change order from UTRAN in CELL_DCH and CELL_FACH

5.8.1 Introduction

5.8.1.1 3.84 Mcps TDD option

The purpose of inter-RAT cell change order from UTRAN TDD to GSM is to transfer a connection between the UE and UTRAN TDD to GSM. This procedure may be used in CELL_DCH and CELL_FACH state. The cell change order procedure is initiated from UTRAN with a RRC message (CELL CHANGE ORDER FROM UTRAN). The procedure is described in [16].

5.8.1.2 1.28 Mcps TDD option

The purpose of inter-RAT cell change order from 1.28 Mcps TDD to GSM is to transfer a connection between the UE and 1.28 Mcps TDD to GSM. This procedure may be used in CELL_DCH and CELL_FACH state. The cell change order procedure is initiated from UTRAN with a RRC message (CELL CHANGE ORDER FROM UTRAN). The procedure is described in [16].

NOTE: No procedure is defined for Inter-RAT cell change order from 1.28Mcps TDD to E-UTRAN.

5.8.1.3 7.68 Mcps TDD option

The purpose of inter-RAT cell change order from UTRAN TDD to GSM is to transfer a connection between the UE and UTRAN TDD to GSM. This procedure may be used in CELL_DCH and CELL_FACH state. The cell change order procedure is initiated from UTRAN with a RRC message (CELL CHANGE ORDER FROM UTRAN). The procedure is described in [16].

5.8.2 Requirements

5.8.2.1 Delay

5.8.2.1.1 3.84 Mcps TDD option

The requirements in this section shall apply to UE supporting 3.84 Mcps TDD and GSM.

When the UE receives a RRC CELL CHANGE ORDER FROM UTRAN COMMAND with the activation time "now" or earlier than the value in table 5.5 from the end of the last TTI containing the RRC command, the UE shall start transmit the random access in the target cell of the new RAT within the value in table 5.5 from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than the value in table 5.5 from the end of the last TTI containing the RRC command, the UE shall start transmit the random access in the target cell of the new RAT at the designated activation time.

The UE shall process the RRC procedures for the RRC CELL CHANGE ORDER FROM UTRAN COMMAND within 50 ms. If the activation time is used, it corresponds to the CFN of the UTRAN channel.

Table 5.5: Inter-RAT cell change order from UTRAN – delay

UE synchronisation status	delay [ms]
The UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	90 + TBCCH +TRA
The UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	190 + TBCCH+TRA

where

T_BCCH = the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA = the additional delay caused by the random access procedure

5.8.2.1.2 1.28 Mcps TDD option

The requirements in this section shall apply to UE supporting both 1.28 Mcps TDD and GSM.

The RRC procedure performance value for the RRC CELL CHANGE ORDER FROM UTRAN COMMAND shall be within 50 ms.

If the activation time is used in the RRC CELL CHANGE ORDER FROM UTRAN COMMAND, it corresponds to the CFN of the UTRAN channel.

When the UE receives a RRC CELL CHANGE ORDER FROM UTRAN COMMAND with the activation time "now" or earlier than the value in table 5.5A from the end of the last TTI containing the RRC command, the UE shall start transmit the random access in the target cell of the new RAT within the value in table 5.5A from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than the value in table 5.5A from the end of the last TTI containing the RRC command, the UE shall start transmit the random access in the target cell of the new RAT at the designated activation time.

Table 5.5A: Inter-RAT cell change order from UTRAN – delay

UE synchronisation status	delay [ms]
The UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	90 + TBCCH +TRA
The UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	190 + TBCCH+TRA

where

T_BCCH = the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA = the additional delay caused by the random access procedure

5.8.2.1.3 7.68 Mcps TDD option

The requirements in this section shall apply to UE supporting 7.68 Mcps TDD and GSM.

When the UE receives a RRC CELL CHANGE ORDER FROM UTRAN COMMAND with the activation time "now" or earlier than the value in table 5.5B from the end of the last TTI containing the RRC command, the UE shall start transmit the random access in the target cell of the new RAT within the value in table 5.5B from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than the value in table 5.5B from the end of the last TTI containing the RRC command, the UE shall start transmit the random access in the target cell of the new RAT at the designated activation time.

The UE shall process the RRC procedures for the RRC CELL CHANGE ORDER FROM UTRAN COMMAND within 50 ms. If the activation time is used, it corresponds to the CFN of the UTRAN channel.

Table 5.5B: Inter-RAT cell change order from UTRAN – delay

UE synchronisation status	delay [ms]
The UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	90 + TBCCH +TRA
The UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	190 + TBCCH+TRA

where

T_BCCH = the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA = the additional delay caused by the random access procedure

5.8.2.2 Interruption time

5.8.2.2.1 3.84 Mcps TDD option

The requirements in this section shall apply to UE supporting 3.84 Mcps TDD and GSM.

The requirements on interruption time below is valid when the signal quality of the serving cell is good enough to allow decoding of the old channel during the inter-RAT cell change order from UTRAN delay.

The interruption time, i.e. the time between the end of the last TTI containing a transport block that the UE is able to receive on the old channel and the time the UE starts transmit the random access in the target cell, shall be less than the value in table 5.6. The requirement in table 5.6 for the case, that UE is not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received, is valid when the signal quality of the GSM cell is good enough for successful synchronisation with one attempt.

Table 5.6: Inter-RAT cell change order from UTRAN – interruption time

Synchronisation status	Interruption time [ms]
The UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	40 + TBCCH +TRA
The UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	140 + TBCCH+TRA

where

T_BCCH = the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA = the additional delay caused by the random access procedure

5.8.2.2.2 1.28 Mcps TDD option

The requirements in this section shall apply to UE supporting both 1.28 Mcps TDD and GSM.

The requirement on interruption time below is valid when the signal quality of the serving cell is good enough to allow decoding of the old channel during the inter-RAT cell change order from UTRAN delay.

The interruption time, i.e. the time between the end of the last TTI containing a transport block that the UE is able to receive on the old channel and the time the UE starts transmit the random access in the target cell, shall be less than the value in table 5.6A.

Table 5.6A: Inter-RAT cell change order from UTRAN – interruption time

Synchronisation status	Interruption time [ms]
The UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	40 + TBCCH +TRA
The UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	140 + TBCCH+TRA

where

T_BCCH = the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA = the additional delay caused by the random access procedure

The requirements in Table 5.6A for the case where the UE has not synchronised to the GSM target cell before receiving the RRC CELL CHANGE ORDER FROM UTRAN COMMAND shall apply only if the signal quality of the GSM target cell is sufficient for successful synchronisation with one attempt.

If the UE is unable to synchronise to the GSM cell on the first attempt, it shall continue to search for synchronisation information for up to 800 ms. If after 800 ms the UE has not synchronised to the GSM cell it shall follow the cell change order from UTRAN failure procedure specified in [16].

5.8.2.2.3 7.68 Mcps TDD option

The requirements in this section shall apply to UE supporting 7.68 Mcps TDD and GSM.

The requirements on interruption time below is valid when the signal quality of the serving cell is good enough to allow decoding of the old channel during the inter-RAT cell change order from UTRAN delay.

The interruption time, i.e. the time between the end of the last TTI containing a transport block that the UE is able to receive on the old channel and the time the UE starts transmit the random access in the target cell, shall be less than the value in table 5.6B. The requirement in table 5.6B for the case, that UE is not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received, is valid when the signal quality of the GSM cell is good enough for successful synchronisation with one attempt.

Table 5.6B: Inter-RAT cell change order from UTRAN – interruption time

Synchronisation status	Interruption time [ms]
The UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	40 + TBCCH +TRA
The UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN COMMAND is received	140 + TBCCH+TRA

where

T_BCCH = the maximum time allowed to read BCCH data from the GSM cell [21].

T_RA = the additional delay caused by the random access procedure

5.9 Serving HS-DSCH cell change

5.9.1 Introduction

5.9.1.1 3.84 Mcps option

Void.

5.9.1.2 1.28 Mcps option

When the UE receives a RRC message implying HS-DSCH cell change with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to receive the HS-SCCH channel from the new cell within T_{cell_change} seconds from the end of the last TTI containing the RRC command.

5.9.1.3 7.68 Mcps option

Void.

5.9.2 Requirements

5.9.2.1 3.84 Mcps option

Void.

5.9.2.2 1.28 Mcps option

5.9.2.2.1 Serving HS-DSCH cell change delay

Procedure delay for the procedure, which can command a HS-DSCH cell change, is specified in TS25.331 section 13.5.2.

When the UE receives a RRC message implying HS-DSCH cell change with the activation time "now" or earlier than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to receive the HS-SCCH channel from the new cell within T_{cell change} seconds from the end of the last TTI containing the RRC command.

If the access is delayed to an indicated activation time later than RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE shall be ready to start the transmission of the new uplink HS-SICH at the designated activation time + processing time.

where:

T_{cell change} = T_RRC + T_{processing。}

The RRC procedure delay T_RRC is defined in TS25.331 Section 13.5.2.

T_{cell change} equals the RRC procedure delay defined in TS25.331 Section 13.5.2 plus the processing time stated in section 5.9.2.2.2.

5.9.2.2.2 Processing time

The HS-DSCH processing time is the time between the last received TTI that can contain a transport block on the old HS-PDSCH and the time when the UE is ready to transmit CQI reports based on the quality of the new cell and the UE have started to receive the HS-SCCH of the new cell.

T_processing = T_{ul/dl sync} + T_{hs-sich/hs-scch interval。}

T_{ul/dl sync} Defined as Uplink and Downlink synchronisation time, specified as 80ms.

T_{hs-sich/hs-scch interval} Defined as interval time between HS-SCCH and the corresponding HS-SICH, for 1,28Mcps option specified as 15ms.

5.9.2.3 7.68 Mcps option

Void.