Outer loop power control method and device

Abstract

The embodiment of the invention discloses an outer loop power control method and outer loop power control equipment, relates to the field of wireless communication and is applied to improving the accuracy of outer loop power control. The outer loop power control method comprises the following steps of: performing combined detection processing on uplink data received at a network side to obtain soft bit data; selecting a plurality of bit data from the soft bit data, and determining an average magnitude value of the selected bit data; decoding the soft bit data, and obtaining a cyclic redundancy check (CRC) result; determining a block error ratio (BLER) according to the CRC result; and determining whether a signal to interference ratio (SIR) target value used for inner loop power control is required to be adjusted according to the BLER and the average magnitude value, and if so, adjusting the SIR target value. According to the method, the accuracy of outer loop power control can be improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to an outer loop power control method and equipment. Background technique [0002] An important method used in the power control of a time division synchronous code division multiple access (Time Division Synchronized Code Division Multiple Access, TD-SCDMA) system is closed-loop power control. Closed-loop power control includes two parts: inner-loop power control and outer-loop power control. [0003] In the inner loop power control, the base station measures the signal to interference ratio (SIR) of the uplink signal sent by the terminal. If the SIR measurement value is lower than the SIR target value, it sends a power control command to increase the power to the terminal. Otherwise, the A power control command to lower the power is sent to the terminal, and the terminal adjusts the uplink transmission power according to the power control command of the base station....

AI Technical Summary

Problems solved by technology

[0025] First, it is impossible to distinguish whether the increase in BLER is caused by coding errors or channel quality deterioration;

[0026] If the enhanced hybrid automatic retransmission indicator channel (E-HICH) information received by the terminal is wrong, it will cause the terminal to resend the data, and the base station will not perform code combination and decoding after receiving such retransmission data, and retransmit the data Some cannot be decoded alone, so it will increase BLER

However, the channel quality at this time has not deteriorated, and it is unreasonable to increase the SIR target value

[0027] Second, when the SIR is lowered, it has a great impact on the rate, and it is impossible to maintain BLER=0 stably;

[0028] When the channel condition changes from poor to good and BLER decreases, the terminal will choose a relatively large transmission block, the encoding rate will also increase, and the error tolerance performance of the encoding will decrease. At this time, if the SIR target value is lowered, the BLER will increase and the rate will be affected. It is very large. In the real environment test, when the single-slot Enhanced Dedicated Channel Physical Uplink Channel (E-PUCH) is used for transmission, the rate is reduced by 100K, and compared with the peak value, the rate is reduced by 20~30%

Images