Method and apparatus for generating and processing a MAC-ehs protocol data unit
A method and apparatus for generating and processing a high speed downlink shared channel (HS-DSCH) medium access control (MAC-ehs) protocol data unit (PDU) are disclosed. MAC-ehs service data units (SDUs) are multiplexed based on a logical channel identity. Reordering PDUs are generated from the multiplexed MAC-ehs SDUs. A reordering PDU includes at least one MAC-ehs SDU and/or at least one MAC-ehs SDU segment. A MAC-ehs SDU is segmented on a priority class basis if a MAC-ehs SDU does not fit into a reordering PDU. A MAC-ehs PDU is generated including at least one reordering PDU. The MAC-ehs SDUs may be stored in priority queues before generating the reordering PDUs. Alternatively, the reordering PDUs may be generated from the multiplexed MAC-ehs SDUs. Alternatively, the received MAC-ehs SDUs may be buffered in a corresponding buffer for each logical channel before multiplexed based on a logical channel identity, or reordering PDUs are generated.
1. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving, by a processor, enhanced high speed medium access control (MAC-ehs) protocol data units (PDUs) via a high speed downlink shared channel (HS-DSCH);
disassembling, by the processor, the MAC-ehs PDUs to provide reordering PDUs, wherein each reordering PDU includes a MAC-ehs service data unit (SDU) or a segment of the MAC-ehs SDU;
organizing, by the processor, the reordering PDUs based on transmission sequence numbers (TSNs);
reassembling, by the processor, the MAC-ehs SDU from segments of the MAC-ehs SDU from at least one of the reordering PDUs; and
providing, by the processor, the reassembled MAC-ehs SDU to a logical channel of a plurality of logical channels, wherein the reassembled MAC-ehs SDU is provided based on a logical channel identifier.
2. The method of claim 1 wherein the receiving of the MAC-ehs PDUs is performed by a hybrid automatic repeat request (HARM) function.
3. The method of claim 1 wherein the disassembling is performed by a disassembly function.
4. The method of claim 1 wherein the organizing is performed by a reordering queue distribution function or a reordering queue.
5. The method of claim 1 wherein the reassembling is performed by a reassembly function.
6. The method of claim 1 further comprising:
reassembling, by the processor, segmented MAC-ehs SDUs to a MAC-ehs SDU for every reordering PDU.
7. A wireless transmit/receive unit (WTRU) comprising:
circuitry configured to receive, at an enhanced high speed medium access control (MAC-ehs), MAC-ehs protocol data units (PDUs) via a high speed downlink shared channel (HS-DSCH);
circuitry configured to disassemble the MAC-ehs PDUs to provide reordering PDUs, wherein each reordering PDU includes a MAC-ehs service data unit (SDU) or a segment of the MAC-ehs SDU;
circuitry configured to organize the reordering PDUs based on transmission sequence numbers (TSNs);
circuitry configured to reassemble the MAC-ehs SDU from segments of the MAC-ehs SDU from at least one of the reordering PDUs; and
circuitry configured to provide the reassembled MAC-ehs SDU to a logical channel of a plurality of logical channels, wherein the reassembled MAC-ehs SDU is provided based on a logical channel identifier.
8. The WTRU of claim 7 wherein the reception of the MAC-ehs PDUs is performed by a hybrid automatic repeat request (HARM) function.
9. The WTRU of claim 7 wherein the disassembly is performed by a disassembly function.
10. The WTRU of claim 7 wherein the organizing is performed by a reordering queue distribution function or a reordering queue.
11. The WTRU of claim 7 wherein the reassembly is performed by a reassembly function.
12. The WTRU of claim 7 further comprising:
the WTRU is configured to reassemble segmented MAC-ehs SDUs to a MAC-ehs SDU for every reordering PDU.