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Method and system for adaptive adjustment in modulation and coding scheme

A technology of self-adaptive adjustment and adjustment of coding, applied in transmission systems, digital transmission systems, error prevention, etc., can solve problems such as not taking into account

Active Publication Date: 2013-08-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 2) At present, when the base station calculates the BLER based on the ACK / NACK result fed back by the UE, it is obtained by dividing the number of NACKs fed back by the length of the sliding window. This essentially uses the same weighting coefficient without taking into account the difference in the sliding window. The ACK / NACK result of the position has different effects on this MCS adjustment

Method used

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  • Method and system for adaptive adjustment in modulation and coding scheme
  • Method and system for adaptive adjustment in modulation and coding scheme
  • Method and system for adaptive adjustment in modulation and coding scheme

Examples

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application example 1

[0117] This example provides a method for MCS adaptive adjustment in the case of two base stations, where eNB1 represents base station 1, eNB2 represents base station 2, and UE1 represents a user terminal; both eNB1 and eNB2 have 4 transmit antennas, UE1 has 2 receive antennas, and eNB1 is a serving cell of UE1, eNB2 is an interfering cell of UE1, H11 is a signal channel, and H12 is an interference channel.

[0118] The specific implementation process of this example is described as follows:

[0119] After UE1 successfully accesses eNB1, eNB1 initializes bit error rate BLER=0, MCS adjustment value ΔMCS=0, counting variables BLERGoodNum=0 and BLERBadNum=0.

[0120] UE1 uses formula 1 to calculate the SINR value in CoMP mode and non-CoMP mode, and then searches the mapping table from SINR to CQI in the downlink, and obtains the CQI value in CoMP mode (indicated by CQI_CoMP) and the CQI value in non-CoMP mode respectively (indicated by CQI_NoCoMP), and feed back the two CQI valu...

application example 2

[0125] This example provides a method for MCS adaptive adjustment in the case of two base stations, where eNB1 represents base station 1, eNB2 represents base station 2, and UE1 represents a user terminal; both eNB1 and eNB2 have 4 transmit antennas, UE1 has 2 receive antennas, and eNB1 is a serving cell of UE1, eNB2 is an interfering cell of UE1, H11 is a signal channel, and H12 is an interference channel.

[0126] The specific implementation process of this example is described as follows:

[0127] After UE1 successfully accesses eNB1, eNB1 initializes bit error rate BLER=0, MCS adjustment value ΔMCS=0, counting variables BLERGoodNum=0 and BLERBadNum=0.

[0128] UE1 uses formula 1 to calculate the SINR value in CoMP mode and non-CoMP mode, and then searches the mapping table from SINR to CQI in the downlink, and obtains the CQI value in CoMP mode (indicated by CQI_CoMP) and the CQI value in non-CoMP mode respectively (indicated by CQI_NoCoMP), and feed back the two CQI valu...

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Abstract

The invention discloses a method and system for adaptive adjustment in a modulation and coding scheme. When user equipment (UE) feeds back channel quality indicator (CQI) results to base stations, CQI results in a coordinative multiple point (CoMP) mode and CQI results in a non-CoMP mode are respectively fed back. The base stations judge whether the CoMP mode is carried out or not. The CQI results in the corresponding mode are selected according to judged results for carrying out modulation and coding scheme (MCS) mapping. A CQI feedback mode applicable to a CoMP coordinated beamforming scene is provided, when the UE feeds back the CQI results, differences of calculation interference between the base stations in the CoMP mode and the non-CoMP mode are fully considered, and therefore the base stations can select a proper MSC value.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and system for adaptive adjustment of modulation and coding schemes. Background technique [0002] In a wireless communication system, throughput is an important index to measure actual service transmission capabilities of a base station, a cell, and a UE (User Equipment, user terminal). MCS (Modulation and Coding Scheme, modulation and coding scheme) and BLER (Block Error Ratio, bit error rate) are two important factors that affect throughput improvement. [0003] In CoMP (Coordinated Multiple Point, Coordinated Multipoint) CB (Coordinated Beamforming, Coordinated Beamforming) mode (hereinafter referred to as CoMP mode), the cells in the coordination set need to select appropriate precoding according to the conditions of their own signals and interference signals matrix to achieve inter-cell interference coordination or avoidance, thereby improving the thr...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04L1/16
Inventor 梁西安王衍文刘文豪
Owner ZTE CORP
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