Method and device for adjusting transmission power in wireless communication system
A technology of wireless communication system and transmission power, which is applied in the field of adjusting transmission power, which can solve the problems of reducing system throughput, increasing overall network interference, reducing data rate, etc., and achieving the effect of reducing multi-cell interference
Inactive Publication Date: 2013-04-24
BEIJING XINWEI TELECOM TECH
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However, if the channel is in fact in a stable, good condition, then continuing to transmit at higher power levels will reduce the data rate, cause interference to other communications, and reduce terminal talk time
In addition, traditional control algorithms generally regard the deterioration of received signal quality as the result of insufficient transmission power, and in these cases, the power will be increased accordingly
Increasing power is effective for resisting channel fading and extranet interference; however, for self-interference caused by multipath, imprecise signal detection, and receiver / transmitter nonlinearity, increasing power does not necessarily improve received signal quality, On the contrary, it is possible to increase the overall interference of the network and reduce the system throughput
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[0026] The technology for adjusting transmission power described in the present invention can be used in various types of wireless communication systems, such as CDMA, TDMA, FDMA, OFDM, OFDMA, CS-OFDMA systems or any of the above hybrid systems, such as OFDMA-TDMA, OFDM-TDMA, CS-OFDMA-TDMA. Applicable systems can be TDD or FDD, depending on the allocated spectrum.
[0027] Next, a CS-OFDMA-TDMA TDD system is used to illustrate the power control method of the present invention. In the CS-OFDMA protocol, radio resources are represented as a two-dimensional plane composed of time-frequency grids, and each grid represents a subcarrier of a certain time slot. Symbols can be modulated onto a grid for transmission. The entire available spectrum is divided into bands, each band consists of K subcarriers. In the time domain, uplink and downlink signals are sent alternately in uplink frames and downlink frames. Each uplink or downlink frame is further divided into a number of time s...
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The invention provides a method for adjusting transmission power. The method comprises the following steps: receiving emergencies consisting of a plurality of message symbols, pilot symbols and null symbols; then, confirming a first signal quality metric and a second signal quality metric for each received emergency based on the received message symbols, the pilot symbols, the null symbols and detection signals; based on the first signal quality metric of a plurality of emergencies selected from the present and the prior received emergencies, confirming signal quality allowance; and finally, generating and sending at least one power control command for each received emergency based on the second signal quality metric and the signal quality allowance. The invention also provides a device for adjusting the transmission power, comprising a receiving analytic unit, a channel estimation unit, a symbol detection unit, a power control calculation unit, a power control command generating unitand a power control command sending unit. The invention can optimally keep the quality of the received signals and reduce the interference of a plurality of sections to the minimum.
Description
technical field [0001] The invention relates to a method and device for adjusting transmission power in a wireless communication system. Background technique [0002] Power control is an important mechanism to adjust the transmission power in wireless communication systems, which can respond to time-varying channel conditions so that the receiver can maintain sufficient signal quality. The power control mechanism should take into account the various adverse channel conditions that exist, such as multipath fading, multi-cell interference, self-interference, alien interference, non-linearity and phase noise of transmitter and receiver circuits. Different channel fading requires different control strategies to achieve the best performance. For most wireless communications, signals are sent in bursts, so closed-loop power control inevitably introduces a delay. [0003] When the traditional power control algorithm is used, under the limited power control step size, the loop del...
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IPC IPC(8): H04B7/005H04B7/26
Inventor 李航周晖徐广涵谢峰
Owner BEIJING XINWEI TELECOM TECH