Channel quality indication adjusting method and base station node

Abstract

The disclosed adjustment method on channel quality indication for HSDPA system comprises: according to business type, selecting relative CQI adjustment algorithm to adjust reported CQI; to non-delay sensitive business, selecting CQI algorithm based on IBLER, while selecting CQI algorithm based on RBLER for delay sensitive business. This invention can adjust IBLER target value according to load condition.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a channel quality indicator (Channel Quality Indicator, CQI for short) adjustment technology in a High Speed ​​Downlink Packet Access (HSDPA for short) system. Background technique [0002] HSDPA is an important feature of the 3rd Generation Partnership Project (3GPP) R5 version, through Adaptive Modulation and Coding (Adaptive Modulation and Coding, referred to as "AMC"), Hybrid Automatic-Repeat -Request, referred to as "HARQ"), and a series of key technologies such as the rapid scheduling of the base station node (Node Base Station, referred to as "Node B"), to achieve high-speed downlink data transmission. [0003] During the data transmission process of HSDPA, the user equipment (User Equipment, referred to as "UE") receives and demodulates the data, and notifies the sender on the network side of whether the data is received correctly, and sends an ACK indication...

AI Technical Summary

Problems solved by technology

[0009] However, the inventors of the present invention found that this method has the following disadvantages: First, for delay-sensitive services such as voice over IP (Voice over IP, referred to as "VoIP"), in order to ensure the transmission rate and reduce the transmission time Delay, the maximum number of retransmissions is usually less (generally not more than 2 times), and a certain residual block error rate RBLER is allowed, as long as RBLER is controlled within an acceptable range, but the CQI is adjusted through IBLER, It is difficult to control the range of RBLER under the premise of limiting the maximum number of retransmissions to 1 or 2 times, and it is impossible to guarantee that the RBLER of the service is within an acceptable range, which is contrary to the expected goal of this type of service

[0010] Secondly, the existing technology cannot set a reasonable IBLER target value, and at the same time adapt to the adjustment of CQI in different environments

If the IBLER target value is set higher, such as 10%, then when the cell load is very low and there is power remaining, adjusting the CQI using this IBLER target value will reduce the transmission rate of a single UE by 10%; if the IBLER target value If it is set lower, such as 1%, when the cell load is very high and there is no remaining power, adjusting the CQI with this IBLER target value will reduce the throughput of the cell

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