Method and apparatus for forwarding non-consecutive data blocks in enhanced uplink transmissions
A method and apparatus for forwarding non-consecutive data blocks in enhanced uplink (EU) transmissions. A wireless transmit/receive unit (WTRU) and one or more Node-Bs include one or more automatic repeat request (ARQ)/hybrid-ARQ (H-ARQ) processes for supporting an enhanced dedicated channel (E-DCH). Data blocks transmitted by the WTRU are re-ordered in a re-ordering entity located in the Node-B(s) or a radio network controller (RNC). Once a missing data block is identified, a data forwarding timer in the Node-B(s) or RNC is initiated and subsequent WTRU transmissions are monitored to determine whether the missing data block has been discarded by the WTRU. Upon recognition of the discard of the missing data block, the non-consecutive data blocks are forwarded to higher layers.
1. An apparatus comprising:
a receiver configured to receive enhanced uplink (EU) data signals from a wireless transmit/receive unit (WTRU) and to recover EU data blocks therefrom using at least one uplink hybrid automatic repeat request (H-ARQ) entity;
a transmitter configured to send positive acknowledgements or negative acknowledgements from the uplink H-ARQ entity over a downlink signaling channel to the WTRU in response to the recovered EU data blocks; and
an EU data re-ordering entity configured to:
store the recovered EU data blocks in at least one EU data re-ordering buffer;
start a timer in response to identifying that an EU data block is missing based on at least one sequence number of the stored EU data blocks; and
deliver at least one EU data block to a higher layer upon a condition that the timer has expired and the missing EU data block has not been recovered from the received EU data signals.
2. The apparatus of claim 1 , wherein each recovered EU data block is a protocol data unit (PDU).
3. The apparatus of claim 2 , wherein the recovered EU data blocks are medium access control (MAC) PDUs.
4. The apparatus of claim 1 , wherein the at least one EU data block delivered to a higher layer is retrieved from the at least one EU data re-ordering buffer.
5. The apparatus of claim 1 , wherein the EU data block is identified as missing when an EU data block is recovered from the received EU data signals with an out-of-order sequence number.
6. The apparatus of claim 1 , wherein the apparatus is a Node-B.
7. The apparatus of claim 1 , wherein the EU data re-ordering entity operates at a radio link control (RLC) layer.
8. The apparatus of claim 7 , wherein the higher layer is a layer above the RLC layer.
9. The apparatus of claim 7 , wherein the uplink H-ARQ entity operates at the RLC layer.
10. The apparatus of claim 1 , wherein a processor is configured to implement the EU data re-ordering entity and the uplink H-ARQ entity.
11. The apparatus of claim 1 , wherein the recovered EU data blocks are stored in the at least one EU data re-ordering buffer by sequence number.
12. The apparatus of claim 1 , wherein the EU data signals are received via an enhanced dedicated channel (E-DCH).
13. A method comprising:
receiving enhanced uplink (EU) data signals from a wireless transmit/receive unit (WTRU);
recovering EU data blocks from the EU data signals using at least one uplink hybrid automatic repeat request (H-ARQ) entity;
sending, by the at least one uplink H-ARQ entity, positive acknowledgements or negative acknowledgements over a downlink signaling channel to the WTRU in response to the recovered EU data blocks;
storing the recovered EU data blocks in at least one EU data re-ordering buffer;
starting a timer in response to identifying that an EU data block is missing based on at least sequence numbers of the stored EU data blocks; and
delivering at least one EU data block to a higher layer upon a condition that the timer has expired and the missing EU data block has not been recovered from the received EU data signals.
14. The method of claim 13 , wherein each recovered EU data block is a protocol data unit (PDU).
15. The method of claim 14 , wherein the recovered EU data blocks are medium access control (MAC) PDUs.
16. The method of claim 13 , further comprising the step of:
retrieving, from the at least one EU data re-ordering buffer, at least one stored EU data block,
wherein the at least one EU data block delivered to a higher layer is the retrieved EU data block.
17. The method of claim 13 , wherein the EU data block is identified as missing when an EU data block is recovered from the received EU data signals with an out-of-order sequence number.
18. The method of claim 13 , wherein the at least one EU data re-ordering buffer and the timer are associated with a Node-B.
19. The method of claim 13 , wherein the steps of storing the recovered EU data blocks, starting a timer, and delivering at least one EU data block are implemented by an EU data re-ordering entity.
20. The method of claim 19 , wherein the EU data re-ordering entity operates at a radio link control (RLC) layer.
21. The method of claim 20 , wherein the higher layer is above the RLC layer.
22. The method of claim 20 , wherein the uplink H-ARQ entity operates at the RLC layer.
23. The method of claim 13 , wherein the recovered EU data blocks are stored in the at least one EU data re-ordering buffer by sequence number.
24. The method of claim 13 , wherein the EU data signals are received via an enhanced dedicated channel (E-DCH).