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Transmission power control method and device

A technology of transmission power control and variance, applied in power management, wireless communication, electrical components, etc., can solve the problems of small size, inability to accurately estimate SNR, inability to perform accurate power control, etc., and achieve the effect of improving accuracy

Active Publication Date: 2016-05-18
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the signal to noise ratio (Signal to Noise Ratio, SNR for short) of the received signal becomes smaller after reducing the transmission power of the SB, if the original SNR estimation method is still used, it is impossible to accurately estimate the SNR after the transmission power of the SB is reduced
Accurate power control is not possible based on the SNR obtained using existing SNR estimation methods

Method used

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  • Transmission power control method and device

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Embodiment Construction

[0039] Since the bit pattern (BitPattern) of SB is "0x5", after receiving SB, the output symbol of joint detection contains the same modulation information. Therefore, in the embodiment of the present invention, kc represents the The number of virtual code channels, kc is related to the value of the spreading factor (SpreadingFactor, referred to as SF), kc=16 / SF. First accumulate the output symbols of each kc joint detection into one symbol, and use N to represent the total number of output symbols of joint detection obtained after accumulation, and obtain N accumulated symbols in total, and then use the accumulated symbols for SNR estimation, Therefore, the value of the low signal-to-noise ratio can be accurately estimated.

[0040] figure 1 It is a flowchart of a transmission power control method according to Embodiment 1 of the present invention. Such as figure 1 As shown, the method includes the following processes.

[0041] Step 101: Perform joint detection on the rec...

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Abstract

The invention provides a transmission power control (TPC) method and device. The TPC method comprises the following steps of carrying out joint detection on received signals to obtain output symbols of the joint detection, accumulating a preset number of the output symbols of the joint detection to obtain soft information of the accumulated output symbols of the joint detection, calculating bit average amplitude and bit average variance according to the soft information of the accumulated output symbols of the joint detection, calculating signal-noise ratio (SNR) according to the bit average amplitude and bit average variance, and carrying out TRC according to the SNR. By means of the TPC method and device, the accuracy of TPC can be improved.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a transmission power control (Transmit Power Control, TPC for short) method and device. Background technique [0002] In a Time Division (TD for short) network, when there is no business, a special burst (Special Burst, SB for short) will be sent, and its function is only to maintain the synchronization of the link. On the R4 carrier, the SB time will account for 50% of the total call time; on the High Speed ​​Packet Access (HSPA for short) carrier, the accompanying channel is only used to transmit signaling, and more than 90% of the time is sent by the accompanying channel It's SB. In the basic TD network, the transmission power used to transmit SB is the same as that used to transmit service data. Therefore, in the scenario of no service, the existence of SB will cause co-channel interference. [0003] At present, the number of TD users continues to increase, and due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/04H04W52/24
Inventor 王健徐绍君柳斯白李国栋杨小倩
Owner TD TECH COMM TECH LTD