8.1.9c Signalling Connection Release Indication in Cell_DCH state when the upper layers of the UE indicate that there is no more PS data for a prolonged period

34.123-13GPPPart 1: Protocol conformance specificationRelease 15TSUser Equipment (UE) conformance specification

8.1.9c.1 Definition

The UE behaves correctly when in Cell_DCH and the upper layers of the UE indicate that there is no more PS data for a prolonged period.

8.1.9c.2 Conformance requirement

In addition, if the timer T323 value is stored in the IE "UE Timers and constants in connected mode" in the variable TIMERS_AND_CONSTANTS, and if there is no CS domain connection indicated in the variable ESTABLISHED_SIGNALLING_CONNECTIONS, the UE may:

1> if the upper layers indicate that there is no more PS data for a prolonged period:

2> if timer T323 is not running:

3> if the UE is in CELL_DCH state or CELL_FACH state; or

3> if the UE is in CELL_PCH state or URA_PCH state and the DRX cycle length in use is shorter than the shorter CN domain specific DRX cycle length for the PS domain and CS domain; or

3> if the UE is in CELL_PCH state or URA_PCH state and the DRX cycle length in use is equal to or longer than the shorter CN domain specific DRX cycle length for the PS domain and CS domain, and V316 < 1:

4> if the UE is in CELL_PCH state or URA_PCH state and the DRX cycle length in use is equal to or longer than the shorter CN domain specific DRX cycle length for the PS domain and CS domain:

5> increment V316 by 1.

4> set the IE "CN Domain Identity" to PS domain;

4> set the IE "Signalling Connection Release Indication Cause" to "UE Requested PS Data session end";

4> transmit a SIGNALLING CONNECTION RELEASE INDICATION message on DCCH using AM RLC;

4> start the timer T323;

3> the procedure ends.

The UE shall be inhibited from sending the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" whilst timer T323 is running.

The UE shall not locally release the PS signalling connection after it has sent the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end".

At transmission or reception of PS data or signalling on SRB3 or upwards, or entering RRC Connected mode, or successful SRNS relocation, the UE shall set V316 to zero.

…

When timer T323 expires:

1> the UE may determine whether any subsequent indications from upper layers that there is no more PS data for a prolonged period in which case it triggers the transmission of a single SIGNALLING CONNECTION RELEASE INDICATION message according with clause 8.1.14.2;

Reference

3GPP TS 25.331 clauses 8.1.14.2 and 8.1.14.4

8.1.9c.3 Test purpose

1. To confirm that when the UE is in Cell_DCH and the upper layers of the UE indicate that there is no more PS data for a prolonged period and the UE transmits the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end":

– the IE "CN Domain Identity" is set to PS domain

– the UE transmits the SIGNALLING CONNECTION RELEASE INDICATION message on DCCH using AM RLC

2. To confirm that when the upper layers of the UE indicate that there is no more PS data for a prolonged period the UE does not transmit the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" while T323 is running.

3. To confirm that after the UE transmits the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" it does not release the signalling connection.

4. To confirm that after the UE transmits the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" the UE can be successfully reconfigured to cell_PCH state.

8.1.9c.4 Method of test

Initial Condition

System Simulator: 1 cell.

UE:

The UE is in state PS-DCCH+DTCH-DCH (state 6-10) as specified in clause 7.4 of TS 34.108.

T323 is not running

Test Procedure

The upper layers of the UE indicate that there is no more PS data for a prolonged period.
The UE transmits a SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" on DCCH using AM RLC.
Before timer T323 expires the upper layers of the UE indicate that there is no more PS data for a prolonged period. The UE shall not transmit a SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" before T323 expires.
To confirm that the UE has not released its PS signalling connection the SS sends a IDENTITY REQUEST with IE “Identity type” set to IMSI. The UE answers with a IDENTITY RESPONSE with the IE “Mobile identity” set to IMSI. The UE is transitioned to cell_PCH state
The SS releases the RRC connection.

Expected sequence

Step

Direction

Message

Comment

UE

SS

1

The UE is triggered to indicate that there is no more PS data for a prolonged period. (Note 1)

2

SIGNALLING CONNECTION RELEASE INDICATION

IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end".

The message is sent on DCCH using AM/RLC.

(Note 2)

3

The UE is triggered to indicate that there is no more PS data for a prolonged period. (Note 1) before T323 expires.

4

Wait until (T323 – 1%of T323) expires.

(Note 3)

5

IDENTITY REQUEST

Identity type = IMSI

6

IDENTITY RESPONSE

Mobile identity = IMSI

7

The UE is transitioned to cell_PCH state using procedure from clause 7.4.2.7.1 TS 34.108.

8

CALL C.4

If the test result of C.4 indicates that UE is in CELL_PCH state, the test passes, otherwise it fails.

Note 1: This indication may be triggered with the AT command +CNMPSD or any alternative way.

Note 2: The timing between steps 1 and 2 is not checked.

Note 3: After T323 expiry the UE might send a SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end". The message shall be ignored by the SS.

Specific Message Content

System Information Block type 1 (preamble)

Use the default system information block with the same type specified in clause 6.1 of TS 34.108, with the following exceptions:

Information Element

Value/remark

– UE Timers and constants in connected mode

– T323

s120

SIGNALLING CONNECTION RELEASE INDICATION on DCCH (Step 2)

Information Element

Value/remark

CN information elements

CN domain identity

PS domain

Signalling Connection Release Indication Cause

UE Requested PS Data session end

IDENTITY REQUEST (Step 5)

Information Element

Value/remark

Identity type 2

IMSI

IDENTITY RESPONSE (Step 6)

Information Element

Value/remark

Mobile identity

IMSI

8.1.9c.5 Test requirement

In Step 2 the UE transmits the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" on DCCH using RLC AM.

In Step 4 the UE does not transmit the SIGNALLING CONNECTION RELEASE INDICATION message with the IE "Signalling Connection Release Indication Cause" set to "UE Requested PS Data session end" while T323 is running.

In Step 6 the UE transmits a IDENTITY RESPONSE message.

In Step 8 procedure C.4 confirms that the UE is in CELL_PCH state.