Abstract
ABSTRACT A method and apparatus for handover in a wireless communication system and a system thereof in which a Base Station (BS) allocates Scheduling Request/Channel Quality Information (SR/CQI) transmission resources to a Mobile Station (MS) an SR/CQI being periodically transmitted from the MS to a target cell determines whether control information has been received from the MS using the allocated SR/CQI transmission resources and allocates radio resources to the MS for transmission of a handover confirm message from the MS upon receipt of the control information from the MS.
Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A handover method of a Base Station (BS) for supporting a handover of a Mobile Station (MS) moving from a source cell to a target cell in a wireless communication system, the method comprising: allocating Scheduling Request/Channel Quality Information (SR/CQI) transmission resources to the MS, an SR/CQI being periodically transmitted from the MS to the target cell; determining whether control information has been received from the MS using the allocated SR/CQI transmission resources; and allocating radio resources to the MS, for transmission of a handover confirm message from the MS, upon receipt of the control information from the MS.
2. The handover method of claim 1, wherein the handover does notneed uplink timing synchronization to the target cell.
3. The handover method of claim 1, wherein information about the SR/CQI transmission resources is included in a handover command message transmitted to the MS.
4. The handover method of claim 3, wherein the handover command message is transmitted to the MS a maximum Hybrid Automatic Repeat reQuest (HARQ) number of or fewer times.
5. The handover method of claim 3, wherein the information about the SR/CQI transmission resources includes information about radio resources allocated to the MS and information about a transmission timing at which the MS will transmit the control information to the BS.
6. The handover method of claim 1, wherein the allocating the SR/CQI transmission resources further comprises: comparing an allocation cycle of the SR/CQI transmission resources with a particular threshold; and adjusting the allocation cycle of the SR/CQI transmission resources when the allocation cycle of the SR/CQI transmission resources is greater than the threshold.
7. The handover method of claim 6, wherein the adjusting the allocation cycle further comprises: reconfiguring the information about the SR/CQI transmission resources into information of a plurality of steps according to the allocation cycle, wherein at least one of the reconfigured information about the SR/CQI transmission resources is set so that the allocation cycle of the SR/CQI transmission resources is less than the threshold.
8. The handover method of claim 6, wherein the threshold is set taking into account of a handover interruption time.
9. The handover method of claim 7, wherein the reconfigured information about the SR/CQI transmission resources is included in a handover command message transmitted to the MS, and information about first-step SR/CQI transmission resources included in the reconfigured information about the SR/CQI transmission resources is used for the MS to request resource allocation for transmission of the handover confirm message to the target cell after the MS successfully receives the handover command message from the source cell
10. The handover method of claim 9, wherein the handover command message is transmitted a maximum HARQ transmission number of or fewer times, further comprising releasing allocation of unused resources in the first-step SR/CQI transmission resources when there remain the unused resources after the control information is received from the UE according to the information about the first-step SR/CQI transmission resources
11. The handover method of claim 1, wherein the CQI further includes sounding information as a uplink reference signal for estimation of uplink channel status
12. A Base Station (BS) for supporting a handover of a Mobile Station (MS) moving from a source cell to a target cell in a wireless communication system, the BS comprising: a transceiver for transmitting and receiving data wirelessly to and from the MS; a message generator for generating information about Scheduling Request/Channel Quality Information (SR/CQI) transmission resources, an SR/CQI being periodically transmitted from the MS to the target cell; a scheduler for allocating the SR/CQI transmission resources and radio resources for transmission of a handover confirm message; and a controller for, when the SR/CQI transmission resources are allocated to the MS and control information is received using the SR/CQI transmission resources from the MS, controlling the message generator and the scheduler so that the radio resources are allocated to the MS, and providing overall control to the message generator
13. The BS of claim 12, wherein the handover does not need uplink timing synchronization to the target cell
14. The BS of claim 12, wherein the information about the SR/CQI transmission resources is included in a handover command message transmitted to the MS
15. The BS of claim 14, wherein the handover command message is transmitted to the MS a maximum Hybrid Automatic Repeat reQuest (HARQ) number of or fewer times
16. The BS of claim 14, wherein the information about the SR/CQI transmission resources includes information about radio resources allocated to the MS and information about a transmission timing at which the MS will transmit the control information to the BS
17. The BS of claim 12, wherein the controller is further configured to compare an allocation cycle of the SR/CQI transmission resources with a particular threshold, and adjust the allocation cycle of the SR/CQI transmission resources, if the allocation cycle of the SR/CQI transmission resources is greater than the threshold
18. The BS of claim 17, wherein when the allocation cycle of the SR/CQI transmission resources is adjusted, the controller is further configured to reconfigure the information about the SR/CQI transmission resources into information of a plurality of steps according to the allocation cycle, wherein at least one of the reconfigured information about the SR/CQI transmission resources is set so that the allocation cycle of the SR/CQI transmission resources is less than the threshold
19. The BS of claim 17, wherein the controller sets the threshold taking into account of a handover interruption time.
20. The BS of claim 18, wherein the reconfigured information about the SR/CQI transmission resources is included in a handover command message transmitted to the MS, and information about first-step SR/CQI transmission resources included in the reconfigured SR/CQI information about the transmission resources is used for the MS to request resource allocation for transmission of the handover confirm message to the target cell after the MS successfully receives the handover command message from the source cell.
21. The BS of claim 20, wherein the handover command message is transmitted to the MS a maximum HARQ transmission number of or fewer times, and the controller is further configured to release allocation of unused resources in the first-step SR/CQI transmission resources, when there remain the unused resources after the control information is received from the UE according to information about the first-step SR/CQI transmission resources.
22. The handover method of claim 12, wherein the CQI further includes sounding information as a uplink reference signal for estimation of uplink channel status.
23. A handover method of a Mobile Station (MS) moving from a source cell to a target cell in a wireless communication system, the method comprising: receiving a message including information about Scheduling Request/Channel Quality Information (SR/CQI) transmission resources from a Base Station (BS) of the source cell, an SR/CQI being periodically transmitted from the MS to a BS of the target cell; transmitting control information to the BS of the target cell according to the information about the SR/CQI transmission resources; and being allocated radio resources for transmission of a handover confirm message from the BS of the target cell.
24. The handover method of claim 23, wherein the handover does not need uplink timing synchronization to the target cell.
25. The handover method of claim 23, wherein the message including the information about the SR/CQI transmission resources is a handover command message received from the BS of the source cell and the handover command message is transmitted to the MS a maximum Hybrid Automatic Repeat reQuest (HARQ) number of or fewer times.
26. The handover method of claim 23, wherein the information about the SR/CQI transmission resources is reconfigured into information of a plurality of steps according to an allocation cycle of the SR/CQI transmission resources, at least one of the reconfigured information about the SR/CQI transmission resources is set so that the allocation cycle of the SR/CQI transmission resources of the at least one step is less than a particular threshold, and the threshold is set taking into account of a handover interruption time.
27. The handover method of claim 23, further comprising: determining whether the information about the SR/CQI transmission resources includes information of a plurality of steps according to an allocation cycle of the SR/CQI transmission resources; and requesting allocation of the radio resources for transmission of the handover confirm message to the BS of the target cell using information about first-step SR/CQI transmission resources in the information of a plurality of steps.
28. The handover method of claim 23, wherein the CQI further includes sounding information as a uplink reference signal for estimation of uplink channel status.
29 A Mobile Station (MS) for performing a handover in a wireless communication system, the MS comprising: a transceiver for transmitting and receiving data wirelessly to and from a Base Station (BS); a message interpreter for interpreting information about Scheduling Request/Channel Quality Information (SR/CQI) transmission resources, an SR/CQI being periodically transmitted from the MS to the BS; a control information generator for generating control information according to the information about the SR/CQI transmission resource; and a resource manager for receiving an interpretation result of the information about the SR/CQI transmission resources from the message interpreter, controlling the transceiver to transmit the control information to the BS, and being allocated radio resources for transmission of a handover confirm message from the BS receiving the control information.
30. The MS of claim 29, wherein the handover does not need uplink timing synchronization to the target cell.
31. The MS of claim 29, wherein a message including the information about the SR/CQI transmission resources is a handover command message received from the BS and the handover command message is transmitted to the MS a maximum Hybrid Automatic Repeat reQuest (HARQ) number of or fewer times.
32. The MS of claim 29, wherein the information about the SR/CQI transmission resources is reconfigured into information of a plurality of steps according to an allocation cycle of the SR/CQI transmission resources in the BS, at least one of the reconfigured information about the SR/CQI transmission resources is set so that the allocation cycle of SR/CQI transmission resources of the at least one step is less than a particular threshold, and the threshold is set taking into account of a handover interruption time.
33. The handover method of claim 29, wherein the CQI further includes sounding information as a uplink reference signal for estimation of uplink channel status.
34. A wireless communication system for supporting handover, the system comprising: a Base Station (BS) for generating information about Scheduling Request/Channel Quality Information (SR/CQI) transmission resources, and when particular control information is received using allocated SR/CQI transmission resources, allocating radio resources for transmission of a handover confirm message; and a Mobile Station (MS) for, upon receipt of a message including the information about the SR/CQI transmission resources, generating control information according to the information about the SR/CQI transmission resources, transmitting the control information to the BS, and being allocated the radio resources for transmission of the handover confirm message by the BS.
35. The handover method of claim 34, wherein the CQI further includes sounding information as a uplink reference signal for estimation of uplink channel status.']
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SUMMARY
ClaimChart-WO2008115041A1-STO
Patent number:WO2008115041A1
Claim Chart Type : SEP Claim Chart
Price: 200 €
Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
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.