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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Specification Information
Specification Information
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Technologies
Power Control
Product
Use Cases
Wireless communication
Services
Claim
1. A method for controlling transmission power of a downlinking signal from a base station to a mobile station depending on a base station selection signal, wherein the mobile station selects at least one primary base station among a plurality of base stations which are connected to the mobile station for soft handover to produce the base station selection signal designating said at least one primary base station, comprising the steps of:
at each of the base stations,
receiving the base station selection signal from the mobile station;
measuring an amount of loss of the base station selection signal;
determining whether the amount of loss of the base station selection signal exceeds of threshold;
when the amount of loss of the base station selection signal does not exceed the threshold, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal; and
when the amount of loss of the base station selection signal exceeds the threshold, setting the transmission power of the downlink signal to the normally controlled level.', 'at each of the base stations,', 'receiving the base station selection signal from the mobile station;
measuring an amount of loss of the base station selection signal;
determining whether the amount of loss of the base station selection signal exceeds of threshold;
when the amount of loss of the base station selection signal does not exceed the threshold, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal; and
when the amount of loss of the base station selection signal exceeds the threshold, setting the transmission power of the downlink signal to the normally controlled level.', 'measuring an amount of loss of the base station selection signal;', 'determining whether the amount of loss of the base station selection signal exceeds of threshold;', 'when the amount of loss of the base station selection signal does not exceed the threshold, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal; and', 'when the amount of loss of the base station selection signal exceeds the threshold, setting the transmission power of the downlink signal to the normally controlled level.
2. The method according to claim 1, wherein the amount of loss of the base station selection signal is a number of erroneously received bits in the base station selection signal.
3. The method according to claim 2, wherein the threshold varies depending on the length of the base station selection signal.
4. The method according to claim 1, wherein the amount of loss of the base station selection signal is a ratio of a punctured length to a length of the basic station selection signal.
5. The method according to claim 1, wherein the threshold varies depending on a length of the base station selection signal.
6. The method according to claim 4, wherein the threshold varies depending on the length of the base station selection signal.
7. A method for controlling transmission power of a downlink signal which is transmitted in frames from a base station to a mobile station depending on a base station selection signal, wherein the mobile station selects at least one primary base station among a plurality of base stations which are connected to the mobile station for soft handover to produce the base station selection signal designating said at least one primary base station, wherein an uplink signal including the base station selection signal is transmitted in frames to the base stations, the method comprising the steps of:
at each of the base stations,
a) receiving the uplink signal including the base station selection signal from the mobile station;
b) determining a transmission power update timing so that a downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations; and
c) when reaching the transmission power update timing, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal.', 'at each of the base stations,
a) receiving the uplink signal including the base station selection signal from the mobile station;
b) determining a transmission power update timing so that a downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations; and
c) when reaching the transmission power update timing, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal.', 'a) receiving the uplink signal including the base station selection signal from the mobile station;', 'b) determining a transmission power update timing so that a downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations; and', 'c) when reaching the transmission power update timing, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal.
8. The method according to claim 7, wherein each frame of the uplink signal and the downlink signal is composed of a plurality of time slots which are numbered consecutively, wherein the transmission power update timing in each of the base stations is represented by a number of same time slot.
9. The method according to claim 8, wherein the time slot number indicating the transmission power update timing is determined by delaying a receiving time of the base station selection signal by an amount of time determined so that the downlink signal received at the mobile cation changes in transmission power at same timing
10. The method according to claim 9, wherein the time slot number indicating the transmission power update timing is determined by
(j+Tos) mod Fn,', '(j+Tos) mod Fn,', 'where j is number of a time slot indicating a last portion of the base station selection signal, Tos is waiting time for transmission power update, Fn is number of slots included in one frame, and mod is an operator whose result is the remainder of a division operation
11. The method according to claim 10, wherein the waiting time Tos varies depending on a propagation delay between the base station and the mobile station
12. The method according to claim 10, wherein the waiting time Tos varies depending on the time slot number1
13. A device for controlling transmission power of a downlink signal depending on a base station selection signal in each of base stations of a mobile communications system, wherein a mobile station selects at least one primary base station among a plurality of base stations which are connected to the mobile station for sort handover to produce the base station selection signal designating said at least one primary base station, comprising:
a receiver for receiving the base station selection signal from the mobile station; and
a controller for controlling the transmission power of the downlink signal to the mobile station by
measuring an amount of loss or the base station selection signal;
determining whether the amount of loss of the base station selection signal exceeds a threshold;
when the amount of loss of the base station selection signal does not exceed the threshold, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal; and
when the amount of loss of the base station selection signal exceeds the threshold, setting the transmission power of the downlink signal to the normally controlled level.', 'a receiver for receiving the base station selection signal from the mobile station; and', 'a controller for controlling the transmission power of the downlink signal to the mobile station by', 'measuring an amount of loss or the base station selection signal;', 'determining whether the amount of loss of the base station selection signal exceeds a threshold;', 'when the amount of loss of the base station selection signal does not exceed the threshold, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal; and', 'when the amount of loss of the base station selection signal exceeds the threshold, setting the transmission power of the downlink signal to the normally controlled level.14. The device according to claim 13, wherein the amount of loss of the base station selection signal is a number of erroneously received bits in the base station selection signal.15. The device according to claim 13, wherein the amount of loss of the base station selection signal is a ratio of a punctured length to a length of the base station selection signal.16. The device according to claim 13, wherein the threshold varies depending on a length of the base station selection signal.17. The device according to claim 15, wherein the threshold varies depending on the length of the base station selection signal.18. A device for controlling transmission power of a downlink signal which is transmitted in frames from a base station to a mobile station depending on a base station selection signal, wherein the mobile station selects at least one primary base station among a plurality of base stations which are connected to the mobile station for soft handover to produce base station selection signal designating said at least one primary base station, wherein an uplink signal including the base station selection signal is transmitted in frames to the base stations, the device comprising:
a receiver for receiving the uplink signal including the base station selection signal from the mobile station; and
a controller for controlling the transmission power of the downlink signal to the mobile station by
determining a transmission power update timing 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; and
when reaching the transmission power update timing setting the transmission power of the downlink signal to a select one a normally controlled level and a minimum level depending on the base station selection signal.', 'a receiver for receiving the uplink signal including the base station selection signal from the mobile station; and', 'a controller for controlling the transmission power of the downlink signal to the mobile station by', 'determining a transmission power update timing 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; and', 'when reaching the transmission power update timing setting the transmission power of the downlink signal to a select one a normally controlled level and a minimum level depending on the base station selection signal.19. The device according to claim 18, wherein each frame of the uplink signal and the downlink signal is composed of a plurality of time slots which are numbered consecutively, wherein the transmission power update timing in each of the base stations is represented by a number of same time slot.
20. The device according to claim 19, wherein the time slot number indicating the transmission power updates timing is determined by delaying a receiving time of the base station selection signal by an amount of time determined so that the downlink signal received at the mobile station changes in transmission power at same timing.
21. The device according to claim 19, wherein the time slot number indicating the transmission power update timing is determined by
(j+Tos)mod Fn', '(j+Tos)mod Fn', 'where j is number of a time slot indicating a last portion of the base station selection signal, Tos is waiting time for transmission power update, Fn is number of slots included in one frame, and mod is an operator whose result is the remainder of a division operation.
22. The device according to claim 21, wherein the waiting time Tos varies depending on a propagation delay between the base station and the mobile station.
23. The device according to claim 21, wherein the waiting time Tos varies depending on the time slot number j.']
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