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Forward link transmission power control during soft handoff

A technology of power control and transmit power level, applied in the direction of transmission control/equalization, power management, communication between multiple stations, etc., can solve problems such as communication quality degradation

Inactive Publication Date: 2002-06-05
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the base station transmits at too low a power level, then the communication quality will degrade

Method used

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  • Forward link transmission power control during soft handoff
  • Forward link transmission power control during soft handoff
  • Forward link transmission power control during soft handoff

Examples

Experimental program
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Embodiment Construction

[0021] The symbols sent on the forward and reverse channels are formatted into frames, each frame having a length of 20 milliseconds. The amount of data sent in each frame depends on the data rate. Each frame contains out-of-band signaling on the reverse channel. In forward power control, the mobile station sends the desired forward SNR variation out-of-band on the reverse channel.

[0022] Figure 3 illustrates the frame-by-frame signal processing of the SNR signal and the power control signal between the mobile station 10, the base stations 12, 14 and the base station controller 16 or selector 18 during soft handoff operation. Each time period T, T+1, etc., represents a transmitted information frame. Note that while the SNR signal in the example below is sent once per frame, SNR updates from the mobile station on the airwaves are sent more than once per frame, and typically more than updates between the base station controller 16 and the selector 18 . The following is an e...

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Abstract

Forward power control for a mobile communication system is provided on a frame by frame basis during a soft handoff of a mobile station from a source base station to a target base station. Each base station runs independent but identical algorithms. A selector runs the same power control algorithm as each base station and coordinates power control between the two base stations and the mobile station during the soft hand-off. The results of the algorithm run by the selector are delayed because of back haul. The selector provides the base stations with traffic gain and frame delay information corresponding to the traffic gain. The base station ASIC, modifies the base station power output according to the SNR data received from the mobile station and the traffic gain and frame delay information received from the selector. Providing the frame delay information permits forward power control even when there is delay from when the selector computes the traffic gain and the traffic gain is programmed into the base station application specific integrated circuit.

Description

technical field [0001] The present invention relates generally to forward power control in Code Division Multiple Access ("CDMA") mobile communication systems, and is particularly directed to power control using forward channels in CDMA systems. Background technique [0002] Carrying out CDMA modulation for mobile communication by using RF spectrum is one of several technologies in the communication system that serve the majority of users. CDMA technology improves quality of service by providing robust operation in fading environments and transparent or "soft" handovers. Soft handover occurs when a mobile station temporarily maintains a connection with a source base station, and sometimes a third base station, while establishing a connection with a target base station. When the mobile communication moves from the current area (source area) to the next area (target area), the communication channel connection is maintained on both areas at the same time. [0003] A smooth so...

Claims

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Application Information

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IPC IPC(8): H04B7/005H04B7/02H04B7/216H04B7/26H04W36/18H04W52/24H04W52/40H04W52/60
CPCH04B7/022H04W52/40H04W52/60H04W52/24H04W36/18
Inventor P·E·本德
Owner QUALCOMM INC
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