METHODS AND APPARATUS FOR REORDERING DATA IN AN EVOLVED HIGH SPEED PACKET ACCESS SYSTEM

• US 20080225765A1
• Filed: 03/14/2008
• Published: 09/18/2008
• Est. Priority Date: 03/15/2007
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Marinier, Paul, Terry, Stephen E., Pani, Diana, Cave, Christopher R., DiGirolamo, Rocco
• Granted Patent: US 8,724,634 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04L 1/1841 Resequencing
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 47/6275 based on priority
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow

Abstract

Method and apparatus for receiving high speed downlink shared channel (HS-DSCH) transmissions are disclosed. An HS-DSCH medium access control (MAC-ehs) entity receives MAC-ehs protocol data units (PDUs) via a high speed downlink shared channel (HS-DSCH) while in one of Cell_FACH, Cell_PCH, and URA_PCH states. The reordering PDUs included in the MAC-ehs PDUs may be sent to a next processing entity without performing reordering of the PDUs. A certain reordering queue may enter a suspend state upon occurrence of a triggering event and MAC-ehs PDUs distributed to the reordering queue in the suspend state may be forwarded to the next processing entity without performing reordering. MAC-ehs reset procedure may be extended for a certain transmission such that the MAC-ehs reset is performed after receiving a MAC-ehs PDU in a target cell.

Claims

1. A method for receiving high speed downlink shared channel (HS-DSCH) transmissions, the method comprising:

receiving HS-DSCH medium access control (MAC-ehs) protocol data units (PDUs) via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state; and

sending reordering PDUs included in the MAC-ehs PDUs to a next processing entity without performing reordering of the reordering PDUs.

2. The method of claim 1 wherein a single hybrid automatic repeat request (HARQ) process is used for receiving the MAC-ehs PDUs.

3. The method of claim 2 wherein all MAC-ehs PDUs are transmitted several times and all retransmissions of a MAC-ehs PDU are completed before starting transmission of a subsequent MAC-ehs PDU.

4. The method of claim 2 wherein the single HARQ process is used for at least one of transmissions from a certain priority queue, transmissions from a certain logical channel, and transmissions using a common HS-DSCH radio network temporary identity (H-RNTI).

5. The method of claim 2 wherein a MAC-ehs PDU intended for a HARQ process is not discarded even if the MAC-ehs PDU is received within five sub-frames from last reception of a MAC-ehs PDU intended for the same HARQ process.

6. The method of claim 2 wherein a MAC-ehs PDU intended for a HARQ process is discarded if the MAC-ehs PDU is received within n sub-frames from last reception of a MAC-ehs PDU intended for the same HARQ process, n being an integer.

7. The method of claim 1 wherein the reordering PDUs are sent to the next processing entity without performing reordering of the reordering PDUs if data carried in the reordering PDUs is from a certain priority queue.

8. The method of claim 1 wherein the reordering PDUs are forwarded to the next processing entity without performing reordering of the reordering PDUs if the MAC-ehs PDU is received using a common HS-DSCH radio network temporary identity (H-RNTI).

9. The method of claim 1 wherein the reordering PDUs are forwarded to the next processing entity without performing reordering of the reordering PDUs if data carried in the reordering PDUs is from a certain logical channel.

10. The method of claim 9 wherein the logical channel is one of a broadcast control channel (BCCH) and a paging control channel (PCCH).

11. A method for receiving high speed downlink shared channel (HS-DSCH) transmissions, the method comprising:

configuring a HS-DSCH medium access control (MAC-ehs) entity for receiving data via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state;

acquiring a transmission sequence number (TSN) to be used in a cell for sending a MAC-ehs protocol data unit (PDU) using a common HS-DSCH radio network temporary identity (H-RNTI); and

configuring a MAC-ehs entity using the TSN.

12. The method of claim 11 wherein the TSN is reset to a default value for a particular queue whenever a MAC-ehs PDU is transmitted to a new wireless transmit/receive unit (WTRU).

13. A method for receiving high speed downlink shared channel (HS-DSCH) transmissions, the method comprising:

configuring a HS-DSCH medium access control (MAC-ehs) entity for receiving data via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state;

receiving a reordering PDU with TSN=SN; and

if RcvWindow_UpperEdge is set to “

Pending”

, setting RcvWindow_UpperEdge to SN and setting next_expected_TSN to RcvWindow_UpperEdge−

WINDOW_SIZE+1.

14. The method of claim 13 further comprising:

if the SN is within a receive window, and if the SN<

the next_expected_TSN, or the reordering PDU has previously been received, discarding the reordering PDU;

otherwise placing the reordering PDU in a reordering buffer at a place indicated by the TSN.

15. The method of claim 14 further comprising:

if the SN is outside the receive window, placing the reordering PDU above a highest received TSN in the reordering buffer at a position indicated by the SN;

setting the RcvWindow_UpperEdge to the SN to update the receive window; and

delivering any reordering PDU with TSN≦

RcvWindow_UpperEdge−

RECEIVE_WINDOW_SIZE, to a reassembly entity.

16. The method of claim 15 further comprising:

if the next_expected_TSN is below the updated receive window, setting the next_expected_TSN to RcvWindow_UpperEdge−

RECEIVE_WINDOW_SIZE+1; and

if the reordering PDU with TSN=next_expected_TSN is stored in the reordering buffer, delivering all received reordering PDUs with consecutive TSNs from the next_expected_TSN up to a first not received reordering PDU to the reassembly entity, and advancing the next_expected_TSN to the TSN of the first not received reordering PDU.

17. The method of claim 13 further comprising:

if there is insufficient memory to process the received reordering PDU, selecting TSN_flush such that the next_expected_TSN<

TSN_flush≦

RcvWindow_UpperEdge+1;

delivering all correctly received reordering PDUs with TSN<

TSN_flush to a reassembly entity; and

if a reordering PDU with TSN=TSN_flush has previously been received, delivering all received reordering PDUs with consecutive TSNs from the TSN_flush up to a first not received reordering PDU to the reassembly entity and advancing the next_expected_TSN to the TSN of the first not received reordering PDU;

otherwise setting the next_expected_TSN to TSN_flush.

18. A method for transmitting high speed downlink shared channel (HS-DSCH) transmissions, the method comprising:

configuring a HS-DSCH medium access control (MAC-ehs) entity for transmitting data via an HS-DSCH while a wireless transmit/receive unit (WTRU) is in one of a Cell_FACH state, Cell PCH state, and URA_PCH state; and

sending MAC-ehs protocol data units (PDUs), each MAC-ehs PDU including a transmission sequence number (TSN), the TSN being assigned to each wireless transmit/receive unit (WTRU) independently.

19. The method of claim 18 wherein the TSN is reset to zero for a new WTRU added to a cell.

20. The method of claim 18 further comprising:

receiving an indication that a message to be transmitted is for a new WTRU; and

resetting a TSN associated with a common HS-DSCH radio network temporary identity (H-RNTI) group.

21. The method of claim 20 wherein the TSN is reset after any previously buffered MAC-ehs PDUs with the same common H-RNTI have been transmitted.

22. A wireless transmit/receive unit (WTRU) for receiving high speed downlink shared channel (HS-DSCH) transmissions, the WTRU comprising:

a transceiver; and

a HS-DSCH medium access control (MAC-ehs) entity for receiving MAC-ehs protocol data units (PDUs) via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state, wherein reordering PDUs included in the MAC-ehs PDUs are sent to a next processing entity without performing reordering of the reordering PDUs.

23. The WTRU of claim 22 wherein the MAC-ehs entity includes a hybrid automatic repeat request (HARQ) process for receiving the MAC-ehs PDUs.

24. The WTRU of claim 23 wherein all MAC-ehs PDUs are transmitted several times and all retransmissions of a MAC-ehs PDU are completed before starting transmission of a subsequent MAC-ehs PDU.

25. The WTRU of claim 23 wherein a single HARQ process is used when data is from a certain priority queue, from a certain logical channel, or transmitted using a common HS-DSCH radio network temporary identity (H-RNTI).

26. The WTRU of claim 23 wherein the MAC-ehs entity is configured not to discard a MAC-ehs PDU intended for a HARQ process even if the MAC-ehs PDU is received within five sub-frames from last reception of a MAC-ehs PDU intended for the same HARQ process.

27. The WTRU of claim 23 wherein the MAC-ehs entity is configured to discard a MAC-ehs PDU intended for a HARQ process if the MAC-ehs PDU is received within n sub-frames from last reception of a MAC-ehs PDU intended for the same HARQ process, n being an integer.

28. The WTRU of claim 27 wherein the number n is wireless transmit/receive unit (WTRU)-dependent.

29. The WTRU of claim 27 wherein the number n is signaled by a higher layer as a capability of a wireless transmit/receive unit (WTRU).

30. The WTRU of claim 22 wherein no hybrid automatic repeat request (HARQ) retransmissions are performed for the MAC-ehs PDUs and all MAC-ehs PDUs are transmitted only once.

31. The WTRU of claim 22 wherein the reordering PDUs are sent to the next processing entity without performing reordering of the reordering PDUs if data carried in the reordering PDUs is from a certain priority queue.

32. The WTRU of claim 22 wherein the reordering PDUs are forwarded to the next processing entity without performing reordering of the reordering PDUs if the MAC-ehs PDU is received using a common HS-DSCH radio network temporary identity (H-RNTI).

33. The WTRU of claim 22 wherein the reordering PDUs are forwarded to the next processing entity without performing reordering of the reordering PDUs if data carried in the reordering PDUs is from a certain logical channel.

34. The WTRU of claim 33 wherein the logical channel is one of a broadcast control channel (BCCH) and a paging control channel (PCCH).

35. A wireless transmit/receive unit (WTRU) for receiving high speed downlink shared channel (HS-DSCH) transmissions, the WTRU comprising:

a transceiver; and

a HS-DSCH medium access control (MAC-ehs) entity configured to receive data via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state, and if RcvWindow_UpperEdge is set to “

Pending”

, set RcvWindow_UpperEdge to SN, the SN being a transmission sequence number (TSN) of a received reordering PDU, and set next_expected_TSN to RcvWindow_UpperEdge−

WINDOW_SIZE+1.

36. The WTRU of claim 35 wherein the MAC-ehs entity is further configured to, if the SN is within a receive window, and if the SN<

the next_expected_TSN, or the reordering PDU has previously been received, discard the reordering PDU;

otherwise place the reordering PDU in a reordering buffer at a place indicated by the TSN.

37. The WTRU of claim 36 wherein the MAC-ehs entity is further configured to, if the SN is outside the receive window, place the reordering PDU above a highest received TSN in a reordering buffer at a position indicated by the SN, set the RcvWindow_UpperEdge to the SN to update the receive window, and deliver any reordering PDU with TSN≦

RcvWindow_UpperEdge−

RECEIVE_WINDOW_SIZE, to a reassembly entity.

38. The WTRU of claim 37 wherein the MAC-ehs entity is configured to, if the next_expected_TSN is below the updated receive window, set the next_expected_TSN to RcvWindow_UpperEdge−

RECEIVE_WINDOW_SIZE+1, and, if the reordering PDU with TSN=next_expected_TSN is stored in the reordering buffer, deliver all received reordering PDUs with consecutive TSNs from the next_expected_TSN up to a first not received reordering PDU to the reassembly entity, and advance the next_expected_TSN to the TSN of the first not received reordering PDU.

39. The WTRU of claim 35 wherein the MAC-ehs entity is configured to, if there is insufficient memory to process the received reordering PDU, select TSN_flush such that the next_expected_TSN<

TSN_flush≦

RcvWindow_UpperEdge+1, deliver all correctly received reordering PDUs with TSN<

TSN_flush to a reassembly entity, and, if a reordering PDU with TSN=TSN_flush has previously been received, deliver all received reordering PDUs with consecutive TSNs from the TSN_flush up to a first not received reordering PDU to the reassembly entity and advance the next_expected_TSN to the TSN of the first not received reordering PDU;

otherwise setting the next_expected_TSN to TSN_flush.

40. A wireless transmit/receive unit (WTRU) for receiving high speed downlink shared channel (HS-DSCH) transmissions, the WTRU comprising:

a transceiver; and

a HS-DSCH medium access control (MAC-ehs) entity configured to receive data via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state, acquire a transmission sequence number (TSN) to be used in a cell for sending a MAC-ehs protocol data unit (PDU) using a common HS-DSCH radio network temporary identity (H-RNTI), and use the TSN for configuration.

41. The WTRU of claim 40 wherein the TSN is reset to a default value for a particular queue whenever a MAC-ehs PDU is transmitted to a new WTRU.

42. A wireless transmit/receive unit (WTRU) for receiving high speed downlink shared channel (HS-DSCH) transmissions, the WTRU comprising:

a transceiver; and

a HS-DSCH medium access control (MAC-ehs) entity configured to receive data via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state;

place a first MAC-ehs PDU in a reordering buffer if a reordering state is a pending state, and set reordering variables based on a transmission sequence number (TSN) of the first MAC-ehs PDU.

43. The WTRU of claim 42 wherein RcvWindow_UpperEdge is set to the TSN of the first MAC-ehs PDU, and next_expected_TSN is set to RcvWindow_UpperEdge−

WINDOW_SIZE+1.

44. A wireless transmit/receive unit (WTRU) for receiving high speed downlink shared channel (HS-DSCH) transmissions, the WTRU comprising:

a transceiver; and

a HS-DSCH medium access control (MAC-ehs) entity configured to receive data via an HS-DSCH while in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state, wherein an initial value of next_expected_TSN is set to a lower edge of a receive window (RcvWindow_UpperEdge−

RECEIVE_WINDOW_SIZE+1).

45. A Node-B for transmitting high speed downlink shared channel (HS-DSCH) transmissions, the Node-B comprising:

a transceiver; and

a HS-DSCH medium access control (MAC-ehs) entity configured to transmit data via an HS-DSCH while a wireless transmit/receive unit (WTRU) is in one of a Cell_FACH state, Cell_PCH state, and URA_PCH state, and send MAC-ehs protocol data units (PDUs), each MAC-ehs PDU including a transmission sequence number (TSN), the TSN being assigned to each WTRU independently.

46. The Node-B of claim 45 wherein the TSN is reset to zero for a new WTRU added to a cell.

47. The Node-B of claim 45 wherein the MAC-ehs entity is configured to receive an indication that a message to be transmitted is for a new WTRU, and reset a TSN associated with a common HS-DSCH radio network temporary identity (H-RNTI) group.

48. The Node-B of claim 45 wherein the TSN is reset after any previously buffered MAC-ehs PDUs with the same common H-RNTI have been transmitted.