8.2.3 Radio bearer release

36.523-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet Core (EPC)Part 1: Protocol conformance specificationRelease 17TSUser Equipment (UE) conformance specification

8.2.3.1 RRC connection reconfiguration / Radio bearer release / Success

8.2.3.1.1 Test Purpose (TP)

(1)

with { UE in E-UTRA RRC_CONNECTED state }

ensure that {
when { UE receives an RRCConnectionReconfiguration message including a drb-ToReleaseList }

then { for each drb-Identity release the PDCP entity and RLC entity and DTCH logical channel

and indicate release of the DRB(s) to upper layers }

}

8.2.3.1.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 36.331 clause 5.3.5.3 and 5.3.10.2.

[TS 36.331, clause 5.3.5.3]

If the RRCConnectionReconfiguration message does not include the mobilityControlInfo and the UE is able to comply with the configuration included in this message, the UE shall:

  1. if this is the first RRCConnectionReconfiguration message after successful completion of the RRC Connection Re-establishment procedure:

…

1> else:

2> If the RRCConnectionReconfiguration message includes the radioResourceConfigDedicated:

3> perform the radio resource configuration procedure as specified in 5.3.10;

…

1> submit the RRCConnectionReconfigurationComplete message to lower layers for transmission using the new configuration, upon which the procedure ends;

[TS 36.331, clause 5.3.10.2]

The UE shall:

1> for each drb-Identity value included in the drb-ToReleaseList that is part of the current UE configuration (DRB release):

2> release the PDCP entity;

2> release the RLC entity;

2> release the DTCH logical channel;

1> indicate the release of the DRB(s) and the eps-BearerIdentity of the released DRB(s) to upper layers;

8.2.3.1.3 Test description

8.2.3.1.3.1 Pre-test conditions

System Simulator:

– Cell 1

UE:

None.

Preamble:

– The UE is in state Generic RB Established (state 3) according to [18].

– The condition SRB2-DRB(2, 0) is used for step 8 in 4.5.3.3 according to [18].

8.2.3.1.3.2 Test procedure sequence

Table 8.2.3.1.3.2-1: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS transmits an RRCConnectionReconfiguration message with a drb-ToReleaseList.

<–

RRCConnectionReconfiguration

–

–

2

Check: Does the UE transmit an RRCConnectionReconfigurationComplete message?

–>

RRCConnectionReconfigurationComplete

1

P

2a

The UE transmits an ULInformationTransfer message.

–>

ULInformationTransfer

–

–

3

Check: Does the test result of generic test procedure in TS 36.508 subclause 6.4.2.3 indicate that the UE is in E-UTRA RRC_CONNECTED state on Cell 1?

–

–

1

–

8.2.3.1.3.3 Specific message contents

Table 8.2.3.1.3.3-1: RRCConnectionReconfiguration (step 1, Table 8.2.3.1.3.2-1)

Derivation Path: 36.508 table 4.6.1-8

Information Element

Value/remark

Comment

Condition

RRCConnectionReconfiguration ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE{

rrcConnectionReconfiguration-r8 SEQUENCE {

dedicatedInfoNASList SEQUENCE (SIZE(1..maxDRB)) OF

1 entry

DedicatedInfoNAS[1]

DEACTIVATE EPS BEARER CONTEXT REQUEST with EPS bearer identity corresponding to drb-Identity 2 and ESM cause #36

According 36.508 table 4.7.3-12 and regular deactivation of a second DRB

radioResourceConfigDedicated

RadioResourceConfigDedicated-DRB-RELEASE

Table 8.2.3.1.3.3-2

}

}

}

}

Table 8.2.3.1.3.3-2: RadioResourceConfigDedicated-DRB-RELEASE (Table 8.2.3.1.3.3-1)

Derivation Path: 36.331 clause 6.3.2

Information Element

Value/remark

Comment

Condition

RadioResourceConfigDedicated ::= SEQUENCE {

srb-ToAddModList

Not present

drb-ToAddModList

Not present

drb-ToReleaseList SEQUENCE (SIZE (1..maxDRB)) OF

1 entry

drb-Identity[1]

2

mac-MainConfig CHOICE { }

Not present

sps-Config

Not present

physicalConfigDedicated

Not present

}