A.5.8 Inter-RAT cell change order from UTRAN TDD to GSM(GPRS)

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

A.5.8.1 Test Purpose and Environment

A.5.8.1.1 3.84Mcps TDD option

Void.

A.5.8.1.2 1.28Mcps TDD option

The purpose of this test is to verify the requirement for the delay when performing the Inter-RAT cell change order from UTRAN TDD to GSM(GPRS) specified in section 5.8.

The test parameters are given in Table A.5.8.1, A.5.8.2, and A.5.8.3 below.

The SS starts the UTRAN cell and brings the UE into PS-DCCH+DTCH_DCH. The SS starts GPRS cell, then sends CELL CHANGE ORDER FROM UTRAN indicating the target cell description, GPRS cell, to the UE through DCCH of the serving UTRAN cell.

After UE receives the command it shall configure itself accordingly and switch to the new channel on the target GPRS cell. The SS checks whether the cell change is performed by checking that the UE receives a successful response to the CHANNEL REQUEST message from the SS through GPRS cell.

The test consists of three successive time periods, with a time duration of T1, T2 and T3 respectively. The UTRAN shall send CELL CHANGE ORDER FROM UTRAN message. The start of T3 is defined as the end of the last TTI containing the CELL CHANGE ORDER FROM UTRAN.

Table A.5.8.1: General test parameters for Correct reporting of UTRAN neighbours in AWGN propagation condition

Parameter	Unit	Value	Comments
DCH parameters		DL Reference Measurement Channel 12.2 kbps	As specified in TS 34.122 clause C2.2
Power Control		On
Target quality value on DTCH	BLER	0.01
Initial conditions	Active cell	Cell 1	UTRAN TDD cell
	Neighbour cell	Cell 2	GSM cell
Final condition	Active cell	Cell 2	GSM cell
Inter-RAT measurement quantity		GSM Carrier RSSI
Hysteresis	dB	0
Time to Trigger	ms	0
Filter coefficient		0
Monitored cell list size	s	12 TD-SCDMA neighbours on Channel 1 6 GSM neighbours including ARFCN 1	Measurement control information is sent before the start of time period T1.
Tidentify abort	s	5
Treconfirm abort	s	5
T1	s	10
T2	s	10
T3	s	10

Table A.5.8.2: Cell Specific Parameters for UTRAN to GPRS cell change order cell case (cell 1)

Parameter	Unit	Cell 1
DL timeslot number		0			DwPTS
		T1	T2	T3	T1	T2	T3
UTRA RF Channel Number		Channel 1
PCCPCH_Ec/Ior	dB	-3
DwPCH_Ec/Ior	dB				0
OCNS_Ec/Ior	dB	-3
	dB	5			5
	dBm/1.28 MHz	-70
Propagation Condition		AWGN

Table A.5.8.3: Cell Specific Parameters for UTRAN to GPRS cell change order cell case (cell 2)

Parameter	Unit	Cell 2
		T1	T2, T3
Absolute RF Channel Number		ARFCN 1
RXLEV	dBm	-85	-75

1) The test is started at the beginning of T1.

2) During time period T2, UTRAN shall send CELL CHANGE ORDER FROM UTRAN message.

3) The start of T3 is defined as the end of the last TTI containint the CELL CHANGE ORDER FROM UTRAN.

A.5.8.1.3 7.68Mcps TDD option

Void.

A.5.8.2 Test Requirements

A.5.8.2.1 3.84Mcps TDD option

Void.

A.5.8.2.2 1.28Mcps TDD option

The UE shall begin to transmit on the new RACH of the target cell less than 190ms + T_BCCH + T_RA from the beginning of time period T3. The rate of correct handovers observed during repeated tests shall be at least 90% with a confidence level of 95 %.

NOTE: The test requirement in this case is expressed as:

T_{CCO delay} = 190ms + T_BCCH+ T_RA or

T_{CCO delay} = 90ms + T_BCCH+ T_RA

190ms: is delay switch from UTRAN to GSM when UE has not synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN is received; when UE has synchronised to the GSM cell before the CELL CHANGE ORDER FROM UTRAN is received, delay switch from UTRAN to GSM is 90ms.

T_BCCH is the maximum time allowed to read BCCH data from GSM cell. According to TS 45.002, the maximum time allowed to read the BCCH data, when being synchronized to a BCCH carrier, is 7.6s (in order to read System Information type 13).

T_RA The additional delay caused by the random access procedure in the GSM cell, is 10 ms (2 GSM radio frames).

A.5.8.2.3 7.68Mcps TDD option

Void.