An uplink adaptive coding and modulation method and a base station for realizing the method

A technology of link self-adaptation and coding modulation, which is applied in the field of wireless communication, can solve problems such as uplink throughput fluctuations, coding method changes, and coding methods that cannot be truly reflected, so as to ensure stability and reliability and reduce corresponding relationships. Reliable, fast-response effects

Inactive Publication Date: 2011-12-14
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an uplink adaptive coding and modulation method and a base station for realizing the method, which are used to solve the problem of frequently changing the coding method by directly using the measured value of the uplink SINR to modulate the coding method in the prior art, thereby causing the uplink throughput Fluctuation problem, to further solve the problem that due to the unsatisfactory uplink SINR threshold value obtained by the test, the encoding method determined based on this threshold value cannot truly reflect the current channel status of the user and cannot respond quickly to the system

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  • An uplink adaptive coding and modulation method and a base station for realizing the method
  • An uplink adaptive coding and modulation method and a base station for realizing the method
  • An uplink adaptive coding and modulation method and a base station for realizing the method

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Embodiment 1

[0036] Please refer to figure 1 , which is a flow chart of the uplink adaptive coding and modulation method of the present invention, and its main implementation process is:

[0037] Measure the uplink SINR, obtain the uplink SINR measurement value, filter and smooth the uplink SINR measurement value, obtain the uplink SINR filter smooth value, use the uplink SINR filter smooth value and the correspondence between the uplink SINR configured on the base station and the modulation and coding mode The relationship determines the modulation and coding scheme used in the uplink.

[0038] Further, the uplink block error rate Bler is counted, and the adjustment value ΔMCS is calculated by using the uplink block error rate Bler, and the adjusted uplink modulation and coding scheme is obtained by adjusting the modulation and coding scheme used in the uplink by the adjustment value ΔMCS.

[0039]The above filtering and smoothing method may be as follows: Assume that the current measure...

Embodiment 2

[0044] Please refer to figure 2 , this figure is the flow chart of calculating the adjustment value ΔMCS using the uplink block error rate Bler of the outer ring according to the present invention, and its main implementation process is:

[0045] Step 21, set the allowable range of the uplink block error rate Bler, the maximum offset Bler_big_deviation and the minimum offset Bler_small_deviation, and set the threshold N for the number of consecutive times. The allowable range of the uplink block error rate Bler includes the upper limit Bler_up_limit and the lower limit Bler_low_limit, and the threshold value of the number of consecutive times N should be as large as possible.

[0046] Step 22, counting the current uplink block error rate Current_Bler, using the sliding window calculation method, each time a reported CRC (Cyclic Redundancy Check, cyclic redundancy check code) is received, the sliding window slides forward once as a result, When the window moves forward, the C...

Embodiment 3

[0060] Please refer to figure 2 , calculate the adjustment value ΔMCS:

[0061] Step 1. Under the Gaussian white noise channel, set the uplink single-send and single-receive mode, and adjust the uplink channel quality to maintain the uplink block error rate Bler at 10% when it is fixed to a certain order modulation and coding method, and traverse all modulation and coding methods The corresponding relationship between the uplink signal-to-noise ratio and the modulation and coding scheme is obtained. Configure the above corresponding relationship locally according to the actual measurement results obtained from the above test;

[0062] Step 2. The window length of the uplink block error rate statistics is 100, and the number of packets with CRC check errors in the window is 32. At this time, the CRC check result of the uplink HARQ is NACK, and the oldest feedback is removed at the same time. ACK, the Curr_Bler calculated in this frame is 33%;

[0063] Step 3: The SINR_measu...

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Abstract

The invention discloses an uplink adaptive modulation and coding method and a base station implementing the method, wherein the method includes: the base station locally configures the corresponding relationship between uplink Signal to Interference-plus-Noise Ratio (SINR) and uplink Modulation and Coding Scheme (MCS), measures uplink SINR to obtain the uplink SINR measurement value, performs filtering and smoothing processing on the SINR measurement value and history SINR filtering values to obtain uplink SINR smoothing filtered value, and determines the MCS adopted by the uplink based on the uplink SINR smoothing filtered value and the corresponding relationship. Through the invention, the dependence on the corresponding relationship between the uplink SINR and the MCS is reduced, and the current channel conditions can be reflected more in real, responses can be made quickly and stability and reliability of the system can be effectively guaranteed.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an uplink adaptive coding and modulation method and a base station for realizing the method. Background technique [0002] With the rapid development of mobile communication systems, OFDM (Orthogonal Frequency Division Multiplexing) technology, which has attracted much attention in digital mobile communication systems, has high spectral efficiency, strong scalability, anti-multipath fading, Frequency-domain self-adaptive scheduling and MIMO (Multiple Input Multiple Output) technology are relatively simple, and will become the core physical layer technology of future cellular mobile communication systems and wireless broadband access systems. [0003] A very important feature of the wireless channel is that it has strong time variation. In the current OFDM system, AMC (Adaptive Modulation Coding, Adaptive Modulation Coding) is usually used to overcome this time variation. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W24/08H04W88/08
CPCH04L1/0009H04L1/0019H04L1/0003Y02D30/50
Inventor 李薇薇
Owner ZTE CORP
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