Method and apparatus for synchronization control of forward link transmitting power during soft handoff in wireless communication systems
First Claim
1. A method for synchronization control of forward link transmitting power during soft handoff in mobile communication systems, wherein the mobile communication system includes base stations (BS) involved in soft handoff, mobile stations (MS) and a base station controller (BSC), and said method comprising the steps of:
- a) determining the current transmitting power TX(i) in the forward link of the base station involved in soft handoff and obtaining the reverse link signal;
b) determining the reception quality of reverse links directly from the obtained reverse link signal;
c) determining the best base station BTS(x) based on the reception quality of reverse links;
d) deciding whether adjustment of forward link transmitting power is required according to the current transmitting power TX(x) in the forward link corresponding to the best base station BTS(x), ande) deciding whether adjustment of power control parameters is required according to the number of the base stations involved in soft handoff and whether the system time of the base stations arrives at the end of a N frame period.
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Reexamination
Accused Products
Abstract
The present invention relates to a method and an apparatus for synchronization control of forward link transmitting power during soft handoff, comprising: collecting the current transmitting power TX(i) of the forward links and the current reception quality of the reverse links; selecting the best base station BTS(x), recording and storing TX(x) reported by BTS(x), marking the BTS(x) as the base station with strong reverse link and the others as base stations with weak reverse link; sending the reverse link flags, TX(x) and the number of base stations involved in soft handoff to all base stations; determining whether a base station is the base station with weak link according to the flag from the base station controller; calculating the deviation between the current transmitting power TX(i) and the TX(x) if the base station is with weak link; adjusting the power control parameters and repeating the above steps; the parameters of the reception quality in reverse links are sampled for every frame in the invention, which not only improves the real time performance of synchronization, but also achieves power synchronization of all base stations and improves the system operation efficiency.
40 Citations
35 Claims
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1. A method for synchronization control of forward link transmitting power during soft handoff in mobile communication systems, wherein the mobile communication system includes base stations (BS) involved in soft handoff, mobile stations (MS) and a base station controller (BSC), and said method comprising the steps of:
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a) determining the current transmitting power TX(i) in the forward link of the base station involved in soft handoff and obtaining the reverse link signal; b) determining the reception quality of reverse links directly from the obtained reverse link signal; c) determining the best base station BTS(x) based on the reception quality of reverse links; d) deciding whether adjustment of forward link transmitting power is required according to the current transmitting power TX(x) in the forward link corresponding to the best base station BTS(x), and e) deciding whether adjustment of power control parameters is required according to the number of the base stations involved in soft handoff and whether the system time of the base stations arrives at the end of a N frame period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 35)
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32. An apparatus for synchronization control of forward link transmitting power during soft handoff in mobile communication systems, wherein said communication system includes base stations involved in soft handoff, mobile stations and a BSC, and the apparatus comprising:
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a reception means, for determining the current transmitting power TX(i) in the forward links for the base stations involved in soft handoff and obtaining reverse link signals; determining means, for determining directly the reception quality of reverse links according to the reverse link signals obtained, and determining the best base station BTS(x) according to the reception quality of reverse links; a processing means, for determining whether; a) the transmitting power in the forward links should be adjusted according to the current transmitting power TX(x) in the forward link corresponding to the best base station BTS(x), b) adjustment of power control parameters is required according to the number of the base stations involved in soft handoff, and c) the system time of the base stations arrives at the end of a N frame period. - View Dependent Claims (33, 34)
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Specification