Method and arrangement in a telecommunications system

A technology of channel state information and bandwidth part, which is applied to devices dedicated to transmitters, transmission systems, baseband systems, etc., which can solve the problems of reducing CQI, failing to provide fast and reliable prediction of CQI, and low throughput, so as to achieve fast and reliable prediction , the effect of reducing the risk of high BLER and unnecessary retransmissions

Inactive Publication Date: 2012-11-07
ERICSSON (CHINA) COMMUNICATION COMPANY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this point, the WB CQI is almost obsolete, for which it does not provide a fast and reliable prediction of the CQI
[0021] Also, if the transmission from the UE to the base station just fails at the end, and a NACK is reported to the base station, the base station will lower the CQI
However, if a NACK is reported after the next WB CQI is reported, the base station will unnecessarily adjust the new WB CQI, which can also result in lower throughput

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  • Method and arrangement in a telecommunications system
  • Method and arrangement in a telecommunications system
  • Method and arrangement in a telecommunications system

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Embodiment Construction

[0070] The focus of embodiments of the invention is the Long Term Evolution (LTE) Physical Uplink Control Channel PUCCH UE Selection Channel State Information (CSI). However, embodiments are not limited to this CSI reporting behavior. It can be applied to any CSI reporting behavior that reports WB CSI and SB CSI in different time instances.

[0071] Embodiments of the present invention enable using CSI for a UE selected subband (SB) within each bandwidth part to predict CSI for other subbands in the same or more bandwidth parts. This can be applied, for example, to figure 1 A wireless telecommunications system is presented in , which shows a UE 12 connected to a base station 14, such as a Node B or eNode B.

[0072] Embodiments of the present invention are also designed to improve the use of LTE PUCCH UE selection CSI such as Channel Quality Indicator (CQI).

[0073] According to 3GPP TS 36.213 v9.0.1, J*K reporting instances are sequentially used for subband CQI reporting ...

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Abstract

The present invention relates to a method in a base station (14, 400) and a base station (14, 400) for predicting a frequency dependent Channel State Information, CSI for scheduling and link adaptation of resource blocks of an operating bandwidth, based on frequency band CSI information related to at least one UE, the method comprising the steps receiving a wideband CSI related to UE (step 302), receiving a UE-selected subband CSI for a bandwidth part (step 302), calculating the difference: the UE-selected subband CSI for the bandwidth part minus a non UE-selected SB CSI the wideband CSI (steps 314, 328, 338), and updating a non UE-selected SB CSI for at least the bandwidth part, based on the calculated difference (steps 318, 332, 342). A faster more reliable prediction method based on UE-selected SB CSI values, is hereby achieved.

Description

technical field [0001] The present invention relates to methods and arrangements in telecommunication systems, in particular it relates to methods and arrangements for feedback compression. Background technique [0002] Link adaptation in a wireless communication system requires a Channel Quality Indicator (CQI). The CQI should reflect the transmission capacity of the frequency-time channel. Thus, in wideband systems with frequency-selective channel fading (e.g., Long Term Evolution (LTE), LTE-Advanced, and Worldwide Interoperability for Microwave Access (WiMAX)), the CQI can be of the wideband type covering the entire frequency bandwidth, or It can be of the frequency selective type, which means that each CQI only covers a part of the bandwidth. For frequency-selective CQI, finer frequency granularity will lead to better channel-dependent scheduling and more accurate link adaptation, thereby leading to higher throughput, lower BLER and shorter packet delivery delay. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L5/0053H04L2025/03808H04L5/0057H04B17/0077H04B17/0067H04L5/006H04L27/2647H04L1/0026H04L1/0027H04L1/0035H04B17/24H04B17/382
Inventor E.埃里克森G.约恩格伦刘愔J.奥斯特加尔德钱雨
Owner ERICSSON (CHINA) COMMUNICATION COMPANY LTD
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