7.2.2a Unacknowledged mode (TDD MBSFN) (non-IMB)

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

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

7.2.2a.1 P-T-M Radio bearer setup

Two generic P-T-M Radio Access Bearers are provided for the MBSFN UM tests.

The UM test RAB is set up using the Generic Procedure described below, and with the default RAB replaced as follows:

– For UM 7-bit "Length Indicator" tests: the RB configuration described in 3GPP TS 34.108 clause 6.11.1c (3.84 Mcps TDD) or 6.11.1d (7.68 Mcps TDD) or 6.11.5.4.4.13 (1.28 Mcps TDD) is used. For these tests, let UM_7_PayloadSize denote the RAB payload size in octets.

– For UM 15-bit "Length Indicator" tests: the RB configuration described in 3GPP TS 34.108 clause 6.11.2a (3.84 Mcps TDD) or 6.11.2b (7.68 Mcps TDD) or 6.11.5.4.4.14 (1.28 Mcps TDD) is used. For these tests, let UM_15_PayloadSize denote the RAB payload size in octets.

These UM test RABs are used in all tests with the following exception:

– Tests that explicitly specify a different Radio Bearer configuration.

All other settings are the same.

The special "Length Indicator" indicating that an SDU begins in the first octet of a PDU, described in clause 9.2.2.8 in 3GPP TS 25.322 is not used except when explicitly stated in the corresponding test case.

Initial conditions

System Simulator:

Unicast carrier: 1 cell, Cell 1 with default configuration.

– MBSFN carriers: 1 cell, Cell 31 has default parameters. In addition to broadcasting System Information, MCCH messages are transmitted by the SS on Cell 31 using MBMS configuration C1 and Default1 MCCH scheduling (No ongoing session) according to subclause 11.2 of TS 34.108.

The configuration of the S-CCPCH which will carry the MTCH is based upon the default test RAB configuration defined above.

User Equipment:

– On the unicast carrier cell the UE is in registered Idle Mode on PS (state 3) if the UE only supports PS domain or registered Idle Mode on CS/PS (state 7) if the UE supports both CS and PS domains, as specified in clause 7.2.2 of TS 34.108.

– The UE is in MBSFN Idle mode with one activated service as specified in clause 7.6.4 of TS 34.108. The UE has selected (i.e. it is included in MBMS_ACTIVATED_SERVICES variable) a national service for which there will be a session starting on MBSFN Cell 31 (see TS 34.108 clause 11.2.4).

Procedure

a) The UE is camping on Cell 1 and Cell 31. In addition to broadcasting System Information, MCCH messages are transmitted by the SS on Cell 31 using MBMS configuration C1 (no session ongoing) and Default1 MCCH scheduling according to clause 11.2 of TS 34.108.

b) The SS sends ACTIVATE RB TEST MODE on the unicast carrier and the UE responds with ACTIVATE RB TEST MODE COMPLETE.

c) The SS sends CLOSE UE TEST LOOP to activate RLC SDU counting on Cell 31 MTCH (Transmission identity indicating the MBSFN MBMS activated service).

d) The SS notifies on MCCH about the start of an MBMS session for one modification period. MCCH messages are transmitted by the SS on Cell 31 using MBMS configuration C4 (one PTM session starting) and Default1 MCCH scheduling according to clause 11.2 of TS 34.108.

e) MCCH messages are then transmitted by the SS on Cell 31 using MBMS configuration C2 (one PTM session ongoing) and Default1 MCCH scheduling according to clause 11.2 of TS 34.108.

f) The SS waits for the UE to start reception of the MBMS data on MTCH according to the specified service activation time. The UE closes the test loop. The UE sends CLOSE UE TEST LOOP COMPLETE.

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1			U	ACTIVATE RB TEST MODE
2			U	ACTIVATE RB TEST MODE COMPLETE
3			U	CLOSE UE TEST LOOP	Loop back mode 3 is activated on Cell 31 for the selected national service on MTCH.
4			M	MBMS MCCH Message Configuration C4	Includes the national service activated at UE in the modified services list for one modification period.
5			M	MBMS MCCH Message Configuration C2	No modified services. One ongoing service corresponding to that activated at the UE.
6			U	CLOSE UE TEST LOOP COMPLETE	The UE establishes the MTCH according to the activation time and closes the test loop.

7.2.2a.2 Reassembly / 7-bit "Length Indicators" / Invalid LI value (TDD MBSFN)

7.2.2a.2.1 Definition

The RLC segments and concatenates SDUs into UMD PDU according to the PDU size requested by MAC. "Length Indicators" are added to allow correct reconstruction of SDUs. The behaviour of the RLC on reception of an invalid "Length Indicator" value has been specified. Incorrect operation of segmentation, concatenation, or coding of "Length Indicators" will result in failure of the UE to communicate.

7.2.2a.2.2 Conformance requirement

Upon delivery by the lower layer of an UMD PDU that contains a "Length Indicator" value specified to be reserved for UMD PDUs in this version of the protocol, the Receiver shall:

– ignore that UMD PDU.

[…]

Length: 7 bits

Bit	Description
1111101	Reserved (PDUs with this coding will be discarded by this version of the protocol).
1111110	AMD PDU: The rest of the RLC PDU includes a piggybacked STATUS PDU. UMD PDU: Reserved (PDUs with this coding will be discarded by this version of the protocol).

Reference(s)

TS 25.322 clause 9.2.2.8 and 11.2.4.1.

7.2.2a.2.3 Test purpose

To test that PDUs with reserved "Length indicator" values of ‘111 1110’ and ‘111 1101’ are discarded by the receiving RLC.

7.2.2a.2.4 Method of test

Initial conditions

The generic procedure for P-T-M Radio Bearer setup (clause 7.2.2a.1) is executed with all the parameters as specified in the procedure for the RAB defined for UM 7-bit "Length Indicator" tests.

Test procedure

a) The SS transmits two RLC SDUs of size UM_7_PayloadSize + 1 bytes. In the third PDU for transmission, the SS sets the value of the second (padding) LI to 1111110.

b) The SS sends UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST. The SS waits for the UE to respond with UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE. The SS shall check that the counter returned by the UE for the MTCH of the activated service in the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE is = 1. The SS records the value.

c) The SS transmits two RLC SDUs of size UM_7_PayloadSize + 1 bytes. In the third PDU for transmission, the SS sets the value of the second (padding) LI to 1111101.

d) The SS sends UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST. The SS waits for the UE to respond with UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE. The SS shall check that the counter returned by the UE for the MTCH of the activated service in the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE is consistent with a number of received RLC SDUs equal to 1.

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1				P-T-M RADIO BEARER SETUP	See clause 7.2.2a.1
2			M	DOWNLINK RLC PDU	SDU 1
3			M	DOWNLINK RLC PDU	SDU 1 & SDU 2
4			M	DOWNLINK RLC PDU	SDU 2 and invalid LI (=11111110)
5			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
6			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one. SS records value.
7			M	DOWNLINK RLC PDU	SDU 1
8			M	DOWNLINK RLC PDU	SDU 1 & SDU 2
9			M	DOWNLINK RLC PDU	SDU 2 and invalid LI (=11111101)
10			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
11			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one.
12			U	OPEN UE TEST LOOP
13			U	OPEN UE TEST LOOP COMPLETE
14			U	DEACTIVATE RB TEST MODE
15			U	DEACTIVATE RB TEST MODE COMPLETE

Specific Message Contents

With the following exceptions, all messages have the same content as defined in TS 34.108 clause 9.1.3 for the MBSFN carriers and in TS 34.108 clause 9.1.1 or 9.1.2 for the unicast carrier:

None.

7.2.2a.2.5 Test requirements

1) At step 6, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

2) At step 11, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

7.2.2a.3 Reassembly / 7-bit "Length Indicators" / LI value > PDU size (TDD MBSFN)

7.2.2a.3.1 Definition

The RLC segments and concatenates SDUs into UMD PDUs according to the PDU size requested by MAC. "Length Indicators" are added to allow correct reconstruction of SDUs. The behaviour of the RLC on reception of an invalid "Length Indicator" value has been specified. Incorrect operation of segmentation, concatenation, or coding of "Length Indicators" will result in failure of the UE to communicate.

7.2.2a.3.2 Conformance requirement

If the "Length Indicator" of an UMD PDU has a value that is larger than the PDU size – RLC header size and is not one of the predefined values listed in the table of TS 25.322 subclause 9.2.2.8, the Receiver shall:

– ignore the UMD PDU.

[…]

Upon delivery of a set of UMD PDUs from the lower layer, the Receiver shall:

– update VR(US) according to each received UMD PDU (see TS 25.322 subclause 9.4);

– if the updating step of VR(US) is not equal to one (i.e. one or more UMD PDUs are missing):

– discard the SDUs that have segments in the missing UMD PDUs.

Reference(s)

TS 25.322 clauses 11.2.4.2 and 11.2.3.

7.2.2a.3.3 Test purpose

To test that PDUs with "Length Indicators" that point beyond the end of the PDU are ignored by the receiving RLC entity.

7.2.2a.3.4 Method of test

Initial conditions

The generic procedure for P-T-M Radio Bearer setup (clause 7.2.2a.1) is executed with all the parameters as specified in the procedure for the RAB defined for UM 7-bit "Length Indicator" tests.

Test procedure

a) The SS transmits three RLC SDUs of size UM 7 PayloadSize + 1 bytes. All the SDUs are concatenated or segmented over successive RLC PDUs. In the third PDU for transmission, the SS sets value of the "Length Indicator" to be UM_7_PayloadSize (decimal).

b) The SS sends UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST. The SS waits for the UE to respond with UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE. The SS shall check that the counter returned by the UE for the MTCH of the activated service in the UE TEST LOOP MODE 4 RLC SDU COUNTER RESPONSE is = 1. The SS records the value.

c) The SS transmits three RLC SDUs of size UM 7 PayloadSize + 1 bytes. All the SDUs are concatenated or segmented over successive RLC PDUs. In the third PDU for transmission, the SS sets value of the "Length Indicator" to be UM_7_PayloadSize (decimal).

d) The SS sends UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST. The SS waits for the UE to respond with UE TEST LOOP MODE 4 RLC SDU COUNTER RESPONSE. The SS shall check that the counter returned by the UE for the MTCH of the activated service in the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE is consistent with a number of received RLC SDUs equal to 1.

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1				P-T-M RADIO BEARER SETUP	See clause 7.2.2a.1
2			M	DOWNLINK RLC PDU	SDU 1
3			M	DOWNLINK RLC PDU	SDU 1 & SDU 2
4			M	DOWNLINK RLC PDU	SDU 2 & SDU 3, with bad LI
5			M	DOWNLINK RLC PDU	SDU 3 and padding
6			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
7			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one. SS records value.
8			M	DOWNLINK RLC PDU	SDU 4
9			M	DOWNLINK RLC PDU	SDU 4 & SDU 5
10			M	DOWNLINK RLC PDU	SDU 5 & SDU 6, with bad LI
11			M	DOWNLINK RLC PDU	SDU 6 and padding
12			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
13			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one.
14			U	OPEN UE TEST LOOP
15			U	OPEN UE TEST LOOP COMPLETE
16			U	DEACTIVATE RB TEST MODE
17			U	DEACTIVATE RB TEST MODE COMPLETE

Specific Message Contents

With the following exceptions, all messages have the same content as defined in TS 34.108 clause 9.1.3 for the MBSFN carriers and in TS 34.108 clause 9.1.1 or 9.1.2 for the unicast carrier:

None.

7.2.2a.3.5 Test requirements

1) At step 7, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

2) At step 13, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

7.2.2a.4 Reassembly / 7-bit "Length Indicators" / First data octet LI (TDD MBSFN)

7.2.2a.4.1 Definition

The RLC segments and concatenates SDUs into UMD PDUs according to the PDU size requested by MAC. "Length indicators" are added to allow correct reconstruction of SDUs. A special "Length Indicator" is defined to indicate that the start of an SDU is coincident with the start of the PDU. The special "Length Indicator" is needed to avoid discarding of an SDU when the first received PDU has a sequence number different from zero. Incorrect operation of segmentation, concatenation, or coding of "Length Indicators" will result in failure of the UE to communicate.

7.2.2a.4.2 Conformance requirement

1. "Length Indicator" = 1111100, UMD PDU: The first data octet in this RLC PDU is the first octet of a RLC SDU.

2. Upon delivery of a set of UMD PDUs from the lower layer, the Receiver shall:

…

– if the special "Length Indicator" "1111 100" or "1111 1111 1111 100" is the first "Length Indicator" of a UMD PDU received on the downlink:

– consider the first data octet in this UMD PDU as the first octet of an RLC SDU.

Reference(s)

1. TS 25.322 clause 9.2.2.8.

2. TS 25.322 clause 11.2.3.

7.2.2a.4.3 Test purpose

To test that a UE in unacknowledged mode correctly handles a received RLC PDU with a 7-bit "Length Indicator" having its value equal to the special "Length Indicator" value 1111100 when the sequence number of the first received PDU is different from zero.

7.2.2a.4.4 Method of test

Initial conditions

The generic procedure for P-T-M Radio Bearer setup (clause 7.2.2a.1) is executed with all the parameters as specified in the procedure for the RAB defined for UM 7-bit "Length Indicator" tests.

Test procedure

a) The SS transmits a RLC SDU of size 12 bytes in a PDU which has the ‘First Data Octet LI’ as the first "Length Indicator" in the PDU.

c) The SS transmits another SDU of 12 bytes in a PDU which has the ‘First Data Octet LI’ as the first "Length Indicator" in the PDU.

NOTE: The SS sends PDUs in downlink starting at sequence number 10.

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1				P-T-M RADIO BEARER SETUP	See clause 7.2.2a.1
2			M	DOWNLINK RLC PDU, SN 10	SDU 1 with LI = 1111100
3			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
4			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one. SS records value.
5			M	DOWNLINK RLC PDU, SN 11	SDU 2 with LI = 1111100
6			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
7			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one.
8			U	OPEN UE TEST LOOP
9			U	OPEN UE TEST LOOP COMPLETE
10			U	DEACTIVATE RB TEST MODE
11			U	DEACTIVATE RB TEST MODE COMPLETE

Specific Message Contents

With the following exceptions, all messages have the same content as defined in TS 34.108 clause 9.1.3 for the MBSFN carriers and in TS 34.108 clause 9.1.1 or 9.1.2 for the unicast carrier:

None.

7.2.2a.4.5 Test requirements

1) At step 4, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

2) At step 7, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

7.2.2a.5 Reassembly / 15-bit "Length Indicators" / Invalid LI value (TDD MBSFN)

7.2.2a.5.1 Definition

7.2.2a.5.2 Conformance requirement

Upon delivery by the lower layer of an UMD PDU that contains a "Length Indicator" value specified to be reserved for UMD PDUs in this version of the protocol, the Receiver shall:

– ignore that UMD PDU.;

Length: 15bits

Bit	Description
111111111111110	AMD PDU: The rest of the RLC PDU includes a piggybacked STATUS PDU. UMD PDU: Reserved (PDUs with this coding will be discarded by this version of the protocol).

Reference(s)

TS 25.322 clause 11.2.4.1, 9.2.2.8.

7.2.2a.5.3 Test purpose

To test that PDUs with invalid "Length Indicators" are discarded by the receiving RLC.

7.2.2a.5.4 Method of test

Initial conditions

The generic procedure for P-T-M Radio Bearer setup (clause 7.2.2a.1) is executed with all the parameters as specified in the procedure for the RAB defined for UM 15-bit "Length Indicator" tests.

Test procedure

a) The SS transmits two RLC SDUs of size UM_15_PayloadSize + 1 bytes. In the third PDU for transmission, the SS sets the value of the second (padding) LI to 111111111111110.

c) The SS transmits two RLC SDUs of size UM_15_PayloadSize + 1 bytes. In the third PDU for transmission, the SS sets the value of the second (padding) LI to 111111111111110.

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1				P-T-M RADIO BEARER SETUP	See clause 7.2.2a.1
2			M	DOWNLINK RLC PDU	SDU 1
3			M	DOWNLINK RLC PDU	SDU 1 & SDU 2
4			M	DOWNLINK RLC PDU	SDU 2 and invalid LI (=111111111111110)
5			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
6			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one. SS records value.
7			M	DOWNLINK RLC PDU	SDU 1
8			M	DOWNLINK RLC PDU	SDU 1 & SDU 2
9			M	DOWNLINK RLC PDU	SDU 2 and invalid LI (=111111111111110)
10			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
11			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one.
12			U	OPEN UE TEST LOOP
13			U	OPEN UE TEST LOOP COMPLETE
14			U	DEACTIVATE RB TEST MODE
15			U	DEACTIVATE RB TEST MODE COMPLETE

Specific Message Contents

With the following exceptions, all messages have the same content as defined in TS 34.108 clause 9.1.3 for the MBSFN carriers and in TS 34.108 clause 9.1.1 or 9.1.2 for the unicast carrier:

None.

7.2.2a.5.5 Test requirements

1) At step 6, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

2) At step 11, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

7.2.2a.6 Reassembly / 15-bit "Length Indicators" / LI value > PDU size (TDD MBSFN)

7.2.2a.6.1 Definition

7.2.2a.6.2 Conformance requirement

If the "Length Indicator" of a PDU has a value that is larger than the PDU size – the number of octets containing "Length Indicators" in the PDU – 1 and is not one of the predefined values listed in the table of 3GPP TS 25.322 clause 9.2.2.8, the PDU shall be discarded and treated as a missing PDU.

If a PDU with sequence number < VR(US) is missing then all SDUs that have segments in this PDU shall be discarded.

Reference(s)

TS 25.322 clauses 11.2.4.2 and 11.2.3.

7.2.2a.6.3 Test purpose

To test that PDUs with "Length Indicators" that point beyond the end of the PDU are ignored by the receiving RLC entity.

7.2.2a.6.4 Method of test

Initial conditions

The generic procedure for P-T-M Radio Bearer setup (clause 7.2.2a.1) is executed with all the parameters as specified in the procedure for the RAB defined for UM 15-bit "Length Indicator" tests.

Test procedure

a) The SS transmits three RLC SDUs of size UM 15 PayloadSize + 1 bytes. All the SDUs are concatenated or segmented over successive RLC PDUs. In the third PDU for transmission, the SS sets value of the "Length Indicator" to be UM_15_PayloadSize (decimal).

c) The SS transmits three RLC SDUs of size UM 15 PayloadSize + 1 bytes. All the SDUs are concatenated or segmented over successive RLC PDUs. In the third PDU for transmission, the SS sets value of the "Length Indicator" to be UM_15_PayloadSize (decimal).

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1				P-T-M RADIO BEARER SETUP	See clause 7.2.2a.1
2			M	DOWNLINK RLC PDU	SDU 1
3			M	DOWNLINK RLC PDU	SDU 1 & SDU 2
4			M	DOWNLINK RLC PDU	SDU 2 & SDU 3, with bad LI
5			M	DOWNLINK RLC PDU	SDU 3 and padding
6			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
7			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one. SS records value.
8			M	DOWNLINK RLC PDU	SDU 4
9			M	DOWNLINK RLC PDU	SDU 4 & SDU 5
10			M	DOWNLINK RLC PDU	SDU 5 & SDU 6, with bad LI
11			M	DOWNLINK RLC PDU	SDU 6 and padding
12			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
13			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one.
14			U	OPEN UE TEST LOOP
15			U	OPEN UE TEST LOOP COMPLETE
16			U	DEACTIVATE RB TEST MODE
17			U	DEACTIVATE RB TEST MODE COMPLETE

Specific Message Contents

With the following exceptions, all messages have the same content as defined in TS 34.108 clause 9.1.3 for the MBSFN carriers and in TS 34.108 clause 9.1.1 or 9.1.2 for the unicast carrier:

None.

7.2.2a.6.5 Test requirements

1) At step 7, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

2) At step 13, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

7.2.2a.7 Reassembly / 15-bit "Length Indicators" / First data octet LI (TDD MBSFN)

7.2.2a.7.1 Definition

The RLC segments and concatenates SDUs into UMD PDUs according to the PDU size requested by MAC. "Length Indicators" are added to allow correct reconstruction of SDUs. A special LI is defined to indicate that the start of on SDU is coincident with the start of the PDU. The special LI is needed to avoid discarding of an SDU when the first received PDU has a sequence number different from zero. Incorrect operation of segmentation, concatenation, or coding of "Length Indicators" will result in failure of the UE to communicate.

7.2.2a.7.2 Conformance requirement

"Length Indicators" = 111111111111100, UMD PDU: The first data octet in this RLC PDU is the first octet of a RLC SDU.

Reference(s)

TS 25.322 clause 9.2.2.8.

7.2.2a.7.3 Test purpose

To test that a UE in unacknowledged mode correctly handles a received RLC PDU with a 15-bit "Length Indicator" having its value equal to the special LI value 111111111111100 when the sequence number of the first received PDU is different from zero.

7.2.2a.7.4 Method of test

Initial conditions

The generic procedure for P-T-M Radio Bearer setup (clause 7.2.2a.1) is executed with all the parameters as specified in the procedure for the RAB defined for UM 15-bit "Length Indicator" tests.

Test procedure

a) The SS transmits a RLC SDU of size 150 bytes in a PDU which has the ‘First Data Octet LI’ as the first "Length Indicator" in the PDU.

c) The SS transmits another SDU of 150 bytes in a PDU which has the ‘First Data Octet LI’ as the first "Length Indicator" in the PDU.

NOTE: The SS sends PDUs in downlink starting at sequence number 10.

Expected sequence

Step	Direction		Carrier	Message	Comment
Step	UE	SS
1				P-T-M RADIO BEARER SETUP	See clause 7.2.2a.1
2			M	DOWNLINK RLC PDU, SN 10	SDU 1 with LI = 111111111111100
3			U	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
4			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one. SS records value.
5			M	DOWNLINK RLC PDU, SN 11	SDU 2 with LI = 111111111111100
6			M	UE TEST LOOP MODE 3 RLC SDU COUNTER REQUEST
7			U	UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE	The SS checks that the number of reported RLC SDUs received on the MTCH is equal to one.
8			U	OPEN UE TEST LOOP
9			U	OPEN UE TEST LOOP COMPLETE
10			U	DEACTIVATE RB TEST MODE
11			U	DEACTIVATE RB TEST MODE COMPLETE

Specific Message Contents

With the following exceptions, all messages have the same content as defined in TS 34.108 clause 9.1.3 for the MBSFN carriers and in TS 34.108 clause 9.1.1 or 9.1.2 for the unicast carrier:

None.

7.2.2a.7.5 Test requirements

1) At step 4, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.

2) At step 7, the UE TEST LOOP MODE 3 RLC SDU COUNTER RESPONSE message shall report a number that corresponds to one received RLC SDU for Cell 31 MTCH.