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Method and device of periodic CQI feedback under carrier polymerization

A carrier aggregation, periodic technology, applied in the direction of transmission modification based on link quality, error prevention/detection using return channel, network traffic/resource management, etc., can solve problems such as time extension, improve speed and efficiency, The effect of reducing downlink scheduling delay

Inactive Publication Date: 2009-12-30
ZTE CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in scenarios that are sensitive to time delay, it is necessary to improve the current UE selection subband CQI feedback scheme to solve the problem of long time delay

Method used

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  • Method and device of periodic CQI feedback under carrier polymerization
  • Method and device of periodic CQI feedback under carrier polymerization
  • Method and device of periodic CQI feedback under carrier polymerization

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Embodiment Construction

[0077] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0078] Considering the problem that the CQI feedback overhead increases proportionally to the bandwidth in the current carrier aggregation scenario, for periodic CQI feedback, in order to reduce the downlink scheduling delay, the CQI feedback speed and efficiency must be improved. Based on this purpose, the present invention proposes a CQI feedback scheme for periodic CQI feedback.

[0079] Assuming that the UE needs to feed back the channel quality of K downlink component carriers, the kth (k=0, 1, ..., K-1) component carrier is denoted as CC k , component carrier CC k The number of BPs included is J k , the number of the corresponding BP is recorded as m=0, 1,..., J k -1. In order to distinguish the same numbered BPs of different CCs, the component carrier CC k the J k A BP is recorded as: ...

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Abstract

The invention discloses a method of periodic Channel Quality Indicator (CQI) feedback under carrier polymerization, comprising: according to a preset sequencing rule, a user end (UE) successively traverses all BP from partial bandwidth (BP) assembly in a downlink weighting carrier, and simultaneously feeds back a plurality of sub-band CQI by adopting a combined feedback method according to the optimum sub-band CQI in each traversed BP to build a CQI report to be fed back to a base station. The invention also discloses a device of periodic CQI feedback under carrier polymerization. The method and the device of periodic CQI feedback under carrier polymerization can reduce downlink schedule time delay during periodic CQI feedback and improve CQI feedback speed and efficiency. The invention also discloses a method for reducing schedule blockage during periodic CQI feedback under carrier polymerization, namely random processing is carried out on the priority level of each weighting carrierwhen UE feeds back the sub-band CQI.

Description

technical field [0001] The present invention relates to the technical field of digital communication, in particular to a method and device for periodic channel quality indicator (CQI) feedback under carrier aggregation. Background technique [0002] A channel quality indicator (CQI, Channel Quality Indicator) is a measurement standard of the communication quality of a wireless channel. The CQI representing the measurement standard of a channel can be one value or multiple values, and the CQI value can be passed through various performance indicators (such as: Signal-to-noise ratio, signal-to-interference-plus-noise ratio, signal-to-noise audible ratio, etc.) are calculated. [0003] Long Term Evolution (LTE, Long Term Evolution) system defines 16 kinds of CQI values ​​(that is, CQI index), as shown in Table 1, each CQI index corresponds to a code rate and a modulation method, and the modulation method has quadrature phase Shift keying (QPSK, Quadrature Phase Shift Keying), ...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04L1/00H04W28/02
CPCH04W72/1231H04L1/0029H04L1/0027H04L1/0026H04W72/542
Inventor 曾萍梁春丽夏树强
Owner ZTE CORP
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