Abstract
A transmission power control technique allowing stable and reliable signal transmission in soft handover is disclosed. Each of the base stations involved in soft handover measures an amount of loss of the base station selection signal. When the amount of loss of the base station selection signal exceeds a threshold the transmission power of the downlink signal is not set to the minimum level but to the normally controlled level. Further a transmission power update timing of each base station is determined so that the downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations.
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Technologies
Power Control
Product
Use Cases
Wireless communication
Services
Claim
1. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.
2. The method according to claim 1, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).
3. The method according to claim 1, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.
4. The method according to claim 1, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.
5. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification does not indicate the base station and the amount of loss of the received base station identification does not exceed a threshold, the base station sets its own state to a non-primary base station state to halt or suppress the downlink transmission, and otherwise the base station sets its own state to a primary base station state to normally perform the downlink transmission, and
wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.
6. The method according to claim 5, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).
7. The method according to claim 5, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.
8. The method according to claim 5, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.
9. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein at the mobile station and the plurality of base stations, each frame of a uplink signal and a downlink signal is divided on time axis into a plurality of slots which are numbered consecutively, wherein downlink transmission timing of each base station is adjusted so that downlink reception timing at the mobile station synchronizes to the downlink transmission timing, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station
10. The method according to claim 9, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15)
11. The method according to claim 9, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station
12. The method according to claim 9, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station
13. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein at the mobile station and the plurality of base stations, each frame of a uplink signal and a downlink signal is divided on time axis into a plurality of slots which are numbered consecutively, wherein downlink transmission timing of each base station is adjusted so that downlink reception timing at the mobile station synchronizes to the downlink transmission timing, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification does not indicate the base station and the amount of loss of the received base station identification does not exceed a threshold, the base station sets its own state to a non-primary base station state to halt or suppress the downlink transmission, and otherwise the base station sets its own state to a primary base station state to normally perform the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.14. The method according to claim 13, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).15. The method according to claim 13, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.16. The method according to claim 13, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.17. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.', 'wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.18. The method according to claim 17, wherein each of the plurality of base stations updates its own state from a downlink slot with the same consecutive number.19. The method according to claim 17, wherein a consecutive number of a downlink slot at which each of the plurality of base stations updates its own state is set to a consecutive number of a slot which is later by number of waiting slots than an uplink slot at which the base station receives the base station identification.
20. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification does not indicate the base station and the amount of loss of the received base station identification does not exceed a threshold, the base station sets its own state to a non-primary base station state to halt or suppress the downlink transmission, and otherwise the base station sets its own state to a primary base station state to normally perform the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.', 'wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.
21. The method according to claim 20, wherein each of the plurality of base stations updates its own state from a downlink slot with the same consecutive number.
22. The method according to claim 20, wherein a consecutive number of a downlink slot at which each of the plurality of base stations updates its own state is set to a consecutive number of a slot which is later by number of waiting slots than an uplink slot at which the base station receives the base station identification.
23. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein at the mobile station and the plurality of base stations, each frame of an uplink signal and a downlink signal is divided on time axis into a plurality of slots which are numbered consecutively, wherein downlink transmission timing of each base station is adjusted so that downlink reception timing at the mobile station synchronizes to the downlink transmission timing, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.', 'wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.
24. The method according to claim 23, wherein each of the plurality of base stations updates its own state from a downlink slot with the same consecutive number.
25. The method according to claim 23, wherein a consecutive number of a downlink slot at which each of the plurality of base stations updates its own state is set to a consecutive number of a slot which is later by number of waiting slots than an uplink slot at which the base station receives the base station identification.
26. A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein at the mobile station and the plurality of base stations, each frame of an uplink signal and a downlink signal is divided on time axis into a plurality of slots which are numbered consecutively, wherein downlink transmission timing of each base station is adjusted so that downlink reception timing at the mobile station synchronizes to the downlink transmission timing, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification does not indicate the base station and the amount of loss of the received base station identification does not exceed a threshold, the base station sets its own state to a non-primary base station state to halt or suppress the downlink transmission, and otherwise the base station sets its own state to a primary base station state to normally perform the downlink transmission,
wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.', 'wherein each of the plurality of base stations updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.
27. The method according to claim 26, wherein each of the plurality of base stations updates its own state from a downlink slot with the same consecutive number.
28. The method according to claim 26, wherein a consecutive number of a downlink slot at which each of the plurality of base stations updates its own state is set to a consecutive number of a slot which is later by number of waiting slots than an uplink slot at which the base station receives the base station identification.
29. A base station for controlling downlink transmission from the base station to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and a plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein when the base station receives the base station identification and the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.
30. The base station according to claim 29, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).
31. The base station according to claim 29, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.
32. The base station according to claim 29, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.
33. A base station for controlling downlink transmission from the base station to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and a plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein when the base station receives the base station identification which does not indicate the base station and the amount of loss of the received base station identification does not exceed a threshold, the base station sets its own state to a non-primary base station state to halt or suppress the downlink transmission, and otherwise the base station sets the own state to a primary base station state to normally perform the downlink transmission,
wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.
34. The base station according to claim 33, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).
35. The base station according to claim 33, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.
36. The base station according to claim 33, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.
37. A base station for controlling downlink transmission from the base station to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and a plurality of base stations are in a soft handover state, wherein at the mobile station and the plurality of base stations, each frame of an uplink signal and a downlink signal is divided on time axis into a plurality of slots which are numbered consecutively, wherein downlink transmission timing of each base station is adjusted so that downlink reception timing at the mobile station synchronizes to the downlink transmission timing, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, when the base station receives the base station identification and the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.
38. The base station according to claim 37, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).
39. The base station according to claim 37, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.
40. The base station according to claim 37, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.
41. A base station for controlling downlink transmission from the base station to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and a plurality of base stations are in a soft handover state, wherein at the mobile station and the plurality of base stations, each frame of an uplink signal and a downlink signal is divided on time axis into a plurality of slots which are numbered consecutively, wherein downlink transmission timing of each base station is adjusted so that downlink reception timing at the mobile station synchronizes to the downlink transmission timing, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, when the base station receives the base station identification which does not indicate the base station and the amount of loss of the received base station identification does not exceed a threshold, the base station sets its own state to a non-primary base station state to halt or suppress the downlink transmission, and otherwise the base station sets the own state to a primary base station state to normally perform the downlink transmission,
wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.', 'wherein the base station updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.
42. The base station according to claim 41, wherein Tos number of waiting slots is three (Tos=3) and Fn number of slots included in a signal frame is fifteen (Fn=15).
43. The base station according to claim 41, wherein Tos number of waiting slots varies depending on an uplink slot number at which the base station receives the base station identification from the mobile station.
44. The base station according to claim 41, wherein Tos number of waiting slots varies depending on a propagation delay between the base station and the mobile station.
45. A base station for controlling downlink transmission from the base station to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and a plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein when the base station receives the base station identification and the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission,
wherein the base station updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.', 'wherein the base station updates its own state at a slot number which is determined based on a slot number at which all of the plurality of base stations complete reception of the base station identification from the mobile station, thereby synchronizing update timing of the own state of each base station, which is observed from the mobile station, in a case where the mobile station is at different propagation distances away from respective ones of the plurality of base stations.
46. The base station according to claim 45, wherein each of the plurality of base stations updates its own state from a downlink slot with the same consecutive number.
47. The base station according to claim 45, wherein a consecutive number of a downlink slot at which the base station updates its own state is set to a consecutive number of a slot which is later by number of waiting slots than an uplink slot at which the base station receives the base station identification.
48. A base station for controlling downlink transmission from the base station to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and a plurality of base stations are in a soft handover state, wherein the mobile station selects one o
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ClaimChart-US7912493B2-STO
Patent number:US7912493B2
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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.
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