7.2.5 Multiflow

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

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

7.2.5.1 RLC Timer_Reordering with Inter-Node B Multiflow operation

7.2.5.1.1 Definition and applicability

All UEs that support Multiflow HSDPA operation.

UE supports FDD.

7.2.5.1.2 Conformance requirement

There are several functions that can prohibit the Receiver from sending a status report containing any of the SUFIs LIST, BITMAP, RLIST or ACK. Status reports containing other SUFIs are not prohibited. Upper layers control which functions should be used for each RLC entity. If any of the following functions is used the transmission of the status report shall be delayed, even if any of the triggering conditions above are fulfilled:

1) STATUS prohibit.

The timer Timer_Status_Prohibit is started according to subclause 9.5 f). The Receiver is not allowed to transmit a status report while acknowledgement is prohibited (see subclause 9.5 f)). If a status report was triggered during this time, the status report is transmitted after the timer Timer_Status_Prohibit has expired, as described below.

2) Void

3) Timer_Reordering

The timer Timer_Reordering is started according to subclause 11.3.3. The receiver is not allowed to transmit a status report while the timer is running. If a status report was triggered during this time, the status report is transmitted after the timer Timer_Reordering has expired, as described below.

When a status report is triggered the Receiver shall:

– if transmission of status reports is not prohibited by any of the functions "STATUS prohibit" or "Timer_Reordering":

– assemble and transmit the status report to the Sender, as specified in subclauses 11.5.2.2 and 11.5.2.3.

– otherwise (if the status report is prohibited by at least one of the functions "STATUS prohibit"):

– if MRW, MRW_ACK, WINDOW or POLL SUFIs are required in the status report:

– send a status report immediately excluding ACK, LIST, BITMAP, and RLIST SUFIs;

– if ACK, LIST, BITMAP, or RLIST SUFIs are required in the status report:

– delay sending these SUFIs until the prohibit function terminates.

Upon expiry of the timer Timer_Status_Prohibit, the Receiver shall:

– if at least one status report was triggered during the time the transmission of a status reports was prohibited that could not be transmitted due to prohibition; and

– if transmission of a status reports is no longer prohibited by any of the functions "STATUS prohibit" or "Timer_Reordering":

– transmit one status report to the Sender, using the procedure described in subclause 11.5.2.3.

Upon expiry of the timer Timer_Reordering, the Receiver shall:

– if at least one status report was triggered during the time the transmission of a status reports was prohibited that could not be transmitted due to prohibition; and

– if transmission of a status reports is no longer prohibited by any of the functions "STATUS prohibit" or "Timer_Reordering":

– update VR(MS) to the SN of the first AMD PDU with SN >= VR(X) which has not been received;

– transmit one status report to the Sender, using the procedure described in subclause 11.5.2.3.

– if VR(H) > VR(MS):

– start Timer_Reordering;

– set VR(X) to VR(H).

Reference

3GPP TS 25.322 clause 9.7.2

7.2.5.1.3 Test purpose

To confirm that the UE runs RLC Timer_Reordering and waits for missing RLC PDUs.

7.2.5.1.4 Method of test

Initial Condition

The generic procedure for Radio Bearer establishment (clause 7.1.3 of TS 34.108) is executed, with all the parameters as specified in the procedure, with the exception that the default Radio Access Bearer is replaced with the RAB defined for AM 7-bit "Length Indicator" tests in clause 7.2.3.1.

These settings apply to both the uplink and downlink DTCH.

System Simulator: 2 cells

Node B 1: Cell 1 (f1, serving HS-DSCH cell)

Node B 2: Cell 2 (f1, assisting serving HS-DSCH cell)

Tcell of Cell 1 is set to 0 chips, Tcell of Cell 2 is set to 1280 chips (0.5 slots).

User equipment:

CELL_DCH (state 6-18 PS-DCCH+DTCH E-DCH/HS-DSCH) under condition A44 as specified in clause 7.4 of TS 34.108 [9]. The procedure P9b in TS 34.108 [9], clause 7.4.2.4a is executed to add Cell 2 in the active set.

Related ICS/IXIT statement(s)

– UE supports FDD

– UE category supports Multiflow HSDPA operation on 2 cells on single frequency (UE Category 21-24)

Test Procedure

The SS starts sending 4 RLC PDUs with SN 4-7 via cell 1. After that the SS starts sending 4 RLC PDUs with SN 0-3 via cell 2. The "Polling bit" (P) should be set in all RLC PDUs.

The SS waits for a STATUS PDU from the UE indicating successful reception of all the RLC PDUs with SN 0-7.

Expected sequence

Step	Direction		Message	Comments
	UE	SS
1			DOWNLINK RLC PDUs	RLC PDUs with SN 4-7 to cell 1
2			DOWNLINK RLC PDUs	RLC PDUs with SN 0-3 to cell 2
3			STATUS PDU	ACK SN 0-7

7.2.5.1.5 Test requirements

In step 3, the SS should receive STATUS PDU from the UE with ACKs for RLC PDUs with SN 0-7.

7.2.5.2 Expiry of RLC Timer_Reordering with Inter-Node B Multiflow operation

7.2.5.2.1 Definition and applicability

All UEs that support Multiflow HSDPA operation.

UE supports FDD.

7.2.5.2.2 Conformance requirement