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Method and device in wireless communication system

A wireless communication system and radio link technology, applied in wireless communication, transmission system, digital transmission system, etc., can solve the problems of negative impact on radio link resource utilization efficiency, slow link self-adaptive estimation and adjustment, etc.

Inactive Publication Date: 2015-12-02
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the aforementioned slow estimation and adjustment of the link adaptation (LA) margin is a problem that negatively affects the efficiency in radio link resource utilization, especially at low to intermediate traffic loads

Method used

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  • Method and device in wireless communication system
  • Method and device in wireless communication system
  • Method and device in wireless communication system

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Embodiment Construction

[0027] Briefly described, methods and apparatus are provided for estimating link adaptation margins by using one or more error distributions, such as signal-to-interference-and-noise ratio (SINR) estimation error distributions. An appropriate link adaptation margin may alternatively be derived from one or more error distributions based on desired quality targets. One or more of the error distributions and hence the estimated link adaptation margin can be made frequency selective. The link adaptation margin can eg be derived from the estimated error distribution of SINR, or alternatively from the estimated error distribution of received signal strength and interference.

[0028] Some definitions:

[0029] Within this document, some expressions will be used when discussing the process of estimating link adaptation margin, some of which will be briefly defined here.

[0030] The expressions "backoff" and "backoff margin" are used to refer to safety margins, such as link adaptat...

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Abstract

In one aspect of the teachings herein, a probability distribution is determined for the prediction errors determined from the differences between predicted and measured values of a quality parameter for a radio link between first and second radio nodes in a wireless communication system. In turn, the probability distribution is used to identify a prediction error value on which a link adaptation margin estimate is based, and the link adaptation margin estimate is provided for use in performing link adaptation, e.g., for use as a “back off” value for the predicted values of radio link quality which are used to make link adaptation decisions.

Description

technical field [0001] The present invention relates to a method and a device in a wireless communication system, in particular to the support of link adaptation. Background technique [0002] A common practice to achieve spectral efficiency in today's radio communication systems is to use Adaptive Modulation and Coding (AMC). When applying AMC in a radio communication system, the modulation and coding of the data to be transmitted is selected to match the current channel quality in order to achieve high system throughput and low latency. For example, in LTE AMC is used both in the uplink (UL) and downlink (DL). [0003] In LTE, the instantaneous downlink channel quality is estimated by the mobile terminal based on measurements performed on reference signals transmitted from the base station. From the measurements, a channel quality report such as a channel quality indicator (CQI) is derived and transmitted in uplink to the base station. The modulation order and code rate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0009H04L1/0003H04L1/0019H04L1/1607H04W24/02H04W72/085H04L1/0026H04W72/542
Inventor M.阿尔姆F.阿特利E.埃里克森M.伦德瓦尔A.西蒙森
Owner TELEFON AB LM ERICSSON (PUBL)