Method for channel quality estimation in uplink transmission power variable system

Abstract

The invention discloses a method for channel quality estimation in an uplink transmission power variable system. The method comprises the following steps: a Node B determines first maximum power gain limited by the UE power capability and second maximum power gain limited for restraining intercell interference, and takes the minimum value of the first maximum power gain and the second maximum power gain as target power gain; the combination of all selectable spreading factors (SF) and modulation coding schemes (MCS) is determined according to the target power gain and the service type of the current scheduling UE, and SIR corresponding to the current MCS is estimated corresponding to the combination of every SF and MCS, and the estimated SIR is utilized to determine the bit number of single-slot transmission corresponding to the combination of the current SF and MCS; in the bit number of the single-slot transmission corresponding to the combination of all the selectable SFs and MCSs, the maximum value is selected as the channel quality estimation result. By applying the invention, the accuracy of channel quality estimation can be enhanced.

Description

technical field [0001] The invention relates to channel quality estimation technology, in particular to a channel quality estimation method in a system with variable uplink transmission power. Background technique [0002] In the current mobile communication technology, both resource scheduling and resource allocation need to estimate the current channel quality of the user, so as to perform appropriate resource scheduling according to the estimation result. [0003] At present, the flow of the method for estimating the channel quality of the user to be scheduled can be performed as follows: [0004] Step 1: Determine the throughput corresponding to the signal-to-noise ratio (SIR) of the last transmission according to the MCS method used in the last transmission. [0005] During the last transmission, the NodeB can obtain the SIR transmitted by the user. In addition, when data is transmitted each time, there is a corresponding relationship between the SIR value and the dat...

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Problems solved by technology

[0009] However, in systems using uplink power control such as High Speed ​​Uplink Packet Access (HSUPA), the power of data sent by the user is not necessarily the same each time, and the SIR from the user to the NodeB also changes accordingly. Therefore, when using the last When the transmitted SIR value evaluates the channel quality, it may not be able to accurately reflect the current channel quality, so the channel quality estimation is inaccurate, which will directly affect the system performance.

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