Abstract
A method and apparatus for controlling an optimization of handover procedures between universal terrestrial radio access (UTRA) release 6 (R6) cells and UTRA release 7 (R7) cells are disclosed. When a wireless transmit/receive unit (WTRU) is moving between an R6 cell and an R7 cell or between R7 cells a handover is initiated from a source Node-B to a target Node-B. In the R7 cell the enhanced medium access control (MAC) functionality including flexible radio link control (RLC) protocol data unit (PDU) size and high speed MAC (MAC-hs) segmentation and multiplexing of different priority queues are supported. After the handover a MAC layer and/or an RLC layer are reconfigured or reset based on functionality supported by the target Node-B.
A method and apparatus for controlling an optimization of handover procedures between universal terrestrial radio access (UTRA) release 6 (R6) cells and UTRA release 7 (R7) cells are disclosed. When a wireless transmit/receive unit (WTRU) is moving between an R6 cell and an R7 cell or between R7 cells a handover is initiated from a source Node-B to a target Node-B. In the R7 cell the enhanced medium access control (MAC) functionality including flexible radio link control (RLC) protocol data unit (PDU) size and high speed MAC (MAC-hs) segmentation and multiplexing of different priority queues are supported. After the handover a MAC layer and/or an RLC layer are reconfigured or reset based on functionality supported by the target Node-B.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 3G | 18/09/2008 | ISLD-200901-001 | INTERDIGITAL INC |
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Specification Information
Specification Information
Technologies
Family Information
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Technologies
Broadcast/Multicast
Product
Use Cases
Wireless communication
Services
Claim
1. A method of resetting a medium access control (MAC) unit, the method comprising: receiving an enhanced high speed MAC (MAC-ehs) reset message from a radio resource control (RRC) unit; flushing a hybrid automatic repeat request (HARQ) soft buffer in the MAC unit for all configured HARQ processes; stopping a re-ordering release timer and a MAC-ehs re-ordering timer located in a re-ordering queue of the MAC unit, wherein the re-ordering queue performs re-ordering of received MAC-ehs protocol data units (PDUs) using at least one variable; setting the timers and the variable to their initial values; delivering all re-ordering PDUs in the re-ordering queue to a reassembly unit located in the MAC unit; the reassembly unit performing reassembly of segmented MAC-ehs service data units (SDUs) and delivering successfully reassembled MAC-ehs SDUs to a logical channel identifier (LCH-ID) demultiplexing unit located in the MAC unit; the LCH-ID demultiplexing unit delivering the complete MAC SDUs to the correct logical channel or MAC flow; discarding stored MAC-ehs SDU segments from the reassembly unit; and flushing the re-ordering queue.
2. A wireless transmit/receive unit (WTRU) comprising: a radio resource control (RRC) unit configured to receive an RRC handover message indicating that a reconfiguration between fixed and flexible radio link control (RLC) protocol data unit (PDU) sizes has occurred; and a radio link control (RLC) unit, wherein the RRC unit determines whether or not to send an RLC re-establishment message to the RLC unit.
3. The WTRU of claim 2 wherein the RRC determines if RLC re- establishment is required if the RRC handover message indicates that the RLC configuration changed from a flexible RLC PDU size to a fixed RLC PDU size.
4. A method of performing a high speed medium access control (MAC- hs) or enhanced MAC-hs (MAC-ehs) reconfiguration in a wireless transmit/receive unit (WTRU), the method comprising: receiving a radio resource control (RRC) handover message indicating a new downlink (DL) MAC-hs or MAC-ehs configuration value.
5. The method of claim 4 wherein the WTRU determines from the RRC message that a MAC reconfiguration has occurred when the MAC changes from MAC-hs to MAC-ehs or from MAC-ehs to MAC-hs.
6. The method of claim 5 wherein a MAC-hs/ehs reset indicator is set in the RRC handover message.
7. The method of claim 6 wherein the WTRU performs a MAC-hs or MAC-ehs reset prior to the MAC-hs/ehs reconfiguration if the MAC-ehs or MAC- hs reset indicator is present.
8. The method of claim 6 wherein an unspecified behavior of the WTRU occurs if the MAC-hs or MAC-ehs reset is not set in the RRC handover message and a MAC-hs/ehs reconfiguration has occurred.
9. A method of minimizing data loss during a handover procedure, the method comprising: discarding service data units (SDUs) that have been successfully transmitted, wherein the SDUs correspond to radio link control (RLC) SDUs; and storing SDUs that have not been discarded in an RLC transmission buffer
10. The method of claim 9 further comprising: discarding all RLC PDUs in a retransmission buffer
11. The method of claim 10 further comprising: resetting state variables associated with a transmitting RLC side; resetting a hyper frame number (HFN); and setting up a new RLC configuration
12. A method of minimizing data loss during a handover procedure, the method comprising: discarding service data units (SDUs) that have been successfully transmitted, wherein the SDUs correspond to packet data convergence protocol (PDCP) SDUs; and storing SDUs that have not been discarded in a PDCP transmission buffer
13. The method of claim 12 further comprising: discarding all radio link control (RLC) protocol data units (PDUs) in a retransmission buffer
14. The method of claim 13 further comprising: resetting state variables associated with a transmitting RLC side; resetting a hyper frame number (HFN); and setting up a new RLC configuration
15. A method of minimizing data loss during a handover procedure, the method comprising: discarding service data units (SDUs) that have been successfully transmitted up to a first unsuccessfully transmitted SDU; and storing SDUs that have not been discarded in a radio link control (RLC) transmission buffer, wherein the SDUs correspond to RLC SDUs
16. The method of claim 15 further comprising: discarding all RLC PDUs in a retransmission buffer
17. The method of claim 16 further comprising: resetting state variables associated with a transmitting RLC side; resetting a hyper frame number (HFN); and setting up a new RLC configuration
18. A method of minimizing data loss during a handover procedure, the method comprising: discarding service data units (SDUs) that have been successfully transmitted up to a first unsuccessfully transmitted SDU; and storing SDUs that have not been discarded in a packet data convergence protocol (PDCP) transmission buffer, wherein the SDUs correspond to PDCP SDUs
19. The method of claim 18 further comprising: discarding all RLC PDUs in a retransmission buffer.
20. The method of claim 19 further comprising: resetting state variables associated with a transmitting RLC side; resetting a hyper frame number (HFN); and setting up a new RLC configuration.
21. A method of sending a service data unit (SDU) status report when a handover occurs, the method comprising: acknowledging successfully received SDUs; and negatively acknowledging unsuccessfully received SDUs, wherein an SDU status report corresponds to a radio link control (RLC) SDU status report.
22. The method of claim 21 further comprising: discarding SDUs that are acknowledged in a received RLC SDU status report during handover.
23. A method of sending a service data unit (SDU) status report when a handover occurs, the method comprising: acknowledging successfully received SDUs; and negatively acknowledging unsuccessfully received SDUs, wherein an SDU status report corresponds to a packet data convergence protocol (PDCP) SDU status report.
24. The method of claim 23 further comprising: discarding SDUs that are acknowledged in a received PDCP SDU status report during handover.
25. A method of retransmitting service data units (SDUs) after a handover occurs, the method comprising: retransmitting SDUs over a new cell, wherein the SDUs correspond to radio link control (RLC) SDUs.
26. The method of claim 25 further comprising: retransmitting all SDUs that have not been acknowledged.
27. The method of claim 25 further comprising: retransmitting all SDUs from a first unsuccessfully transmitted SDU.
28. The method of claim 25 further comprising: retransmitting only SDUs that have been negatively acknowledged after an SDU status report has been received due to a handover.
29. The method of claim 25 further comprising: retransmitting SDUs that have been stored in an RLC SDU transmission buffer.
30. A method of retransmitting service data units (SDUs) after a handover occurs, the method comprising: retransmitting SDUs over a new cell, wherein the SDUs correspond to packet data convergence protocol (PDCP) SDUs.
31. The method of claim 30 further comprising: retransmitting all SDUs that have not been acknowledged.
32. The method of claim 30 further comprising: retransmitting all SDUs from a first unsuccessfully transmitted SDU.
33. The method of claim 30 further comprising: retransmitting only SDUs that have been negatively acknowledged after an SDU status report has been received due to a handover.
34. The method of claim 30 further comprising: retransmitting SDUs that have been stored in a PDCP SDU transmission buffer.
35. A method of processing service data units (SDUs ) when a handover occurs, the method comprising: processing all radio link control (RLC) protocol data units (PDUs) that can be assembled into RLC SDUs; sending all successfully assembled RLC SDUs to upper layers; discarding all RLC PDUs that cannot be assembled into RLC SDUs; and storing all out-of-order SDUs in an RLC SDU reception buffer.
36. The method of claim 35 further comprising: resetting receiver variables and a hyper frame number (HFN); setting up a new medium access control (MAC) configuration; and setting up a new RLC configuration.
37. The method of claim 36 further comprising: assembling an SDU status report indicating successfully and unsuccessfully received SDUs, wherein an SDU status report corresponds to an RLC SDU status report.
38. A method of processing service data units (SDUs) when a handover occurs, the method comprising: processing all radio link control (RLC) protocol data units (PDUs) that can be assembled into RLC SDUs; sending all successfully assembled RLC SDUs to upper layers; discarding all RLC PDUs that cannot be assembled into RLC SDUs; and storing all out-of-order SDUs in a packet data convergence protocol (PDCP) SDU reception buffer.
39. The method of claim 38 further comprising: resetting receiver variables and a hyper frame number (HFN); setting up a new medium access control (MAC) configuration; and setting up a new RLC configuration.
40. The method of claim 39 further comprising: assembling an SDU status report indicating successfully and unsuccessfully received SDUs, wherein an SDU status report corresponds to a PDCP SDU status report.']
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SUMMARY
ClaimChart-EP2127403A2-STO
Patent number:EP2127403A2
Claim Chart Type : SEP Claim Chart
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.