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Method for updating radio link parameter based on system performance and channel quality evaluation

A technology of parameter update and channel quality, which is applied in the communication between multiple stations, using the return channel for error prevention/detection, etc., can solve problems such as inflexibility, CQI power offset, channel fading, etc., and avoid channel quality Too bad, the effect of system performance guarantee

Inactive Publication Date: 2007-04-04
ZTE CORP
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AI Technical Summary

Problems solved by technology

[0015] 3. CQI power offset
[0020] 5. ACK power offset
ACK power offset PO will affect the reliability of ACK transmission
[0022] 6. NACK power offset
[0029] (3) Channel fading
[0034] The first method can only deal with the first situation that requires parameter update, which is not flexible enough
The second method channel quality refers to setting the target HS-DPCCH SIR, and then comparing the measured HS-DPCCH SIR with the target HS-DPCCH SIR as the basis for parameter update. The disadvantage of this method is that it is not suitable for high-speed movement users, and does not reflect the user's system performance well
[0035] In summary, the existing wireless link parameter update method cannot well support HSDPA service users

Method used

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  • Method for updating radio link parameter based on system performance and channel quality evaluation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The system performance index used in this embodiment is retransmission times / scheduling times. This performance index can reflect not only the throughput but also the delay. The channel quality indicators used are average signal-to-interference ratio and Doppler shift.

[0087] The determination method of the system performance threshold value of the initiation timing: determine the maximum value of the user retransmission times / scheduling times under the control of a certain scheduling algorithm and the HS-DPCCH channel has no errors, and this value is used as the initiation timing system performance threshold limit.

[0088] Among them, the parameter update steps include:

[0089] a): Parameter initialization processing, sending the retransmission times / scheduling times threshold value, the channel quality threshold value and the corresponding parameter combination to the initiation timing arbiter and update parameter calculator, and initializing the registers of ea...

Embodiment 2

[0100] The system performance index used in this example is throughput. The channel quality indicators used are average signal-to-interference ratio and Doppler shift.

[0101]The method for determining the system performance threshold at the initiation time: determine the maximum value of the user throughput drop when the HS-DPCCH channel is error-free under the control of a certain scheduling algorithm, and this value is used as the system performance threshold at the initiation time.

[0102] Parameter update steps:

[0103] a): Parameter initialization processing, sending the throughput drop threshold, the channel quality threshold and the corresponding parameter combination to the initiation timing arbiter and update parameter calculator, and initializing the registers of each module.

[0104] b): The evaluator periodically evaluates the throughput degradation and channel quality of each user.

[0105] c): The initiation timing arbiter determines the parameter update st...

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Abstract

The invention is concerned with a renewed method of wireless link parameter based system capability and channel quality evaluation. A step is carrying initialization dispose to select corresponding threshold value, parameter combination and register to initialize each module according to adjustment arithmetic. B step is evaluating system capability and channel quality of user in periodicity by evaluating device. C step starts clock arbitration device to decide the renewed standard of parameter. When the standard is same as the system capability, it jumps to D step, when it is channel quality, jumps to f step. D step judges whether the system capability exceeds the threshold by evaluating device, when it is over the threshold, the counter starts the renew order. E step counts the renew parameter value according to the system capability and jumps to H step. F step sends parameter renewing order to the counter, when the channel quality is over the threshold. G step counts renewing parameter value according to channel quality. H step sends parameter renewing information of wireless link to parameter renewing module.

Description

technical field [0001] The present invention relates to a method for updating radio link parameters based on system performance and channel quality evaluation in a mobile communication system, in particular to an uplink high-speed dedicated physical control channel (HSDPA) in a high-speed downlink packet access system (HSDPA) - A method for updating radio link parameters of DPCCH). Background technique [0002] HSDPA provides users with high-speed data services by adding high-speed downlink shared data channel (HS-DSCH), downlink high-speed control channel (HS-SCCH) and uplink high-speed dedicated physical control channel (HS-DPCCH). The downlink HS-DSCH data channel is used to transmit all user data in the cell; the downlink HS-SCCH control channel is used to transmit physical layer signaling for receiving data; the uplink HS-DPCCH control channel is used to transmit channel quality feedback information (CQI) and HARQ acknowledgment information (ACK / NACK). [0003] The ke...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L1/16
Inventor 刘涛彭佛才吕开颖
Owner ZTE CORP
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