Method and device of periodic CQI feedback under carrier polymerization

A carrier aggregation and periodic technology, applied in transmission modification based on link quality, digital transmission system, error prevention, etc., can solve problems such as time extension, improve speed and efficiency, and reduce downlink scheduling delay.

Inactive Publication Date: 2013-03-27
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

[0075] The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0076] 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.

[0077] 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: The total number ...

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Abstract

A method for periodic Channel Quality Indicator (CQI) feedback for carrier aggregation is disclosed by the present invention, which includes: a User Equipment (UE) traverses in turn, according to a predetermined sorting rule, all the Bandwidth Parts (BPs) in the BP set of the downlink component carriers; and based on the best subband CQIs of all the BPs obtained by traverse, by using combined feedback, the UE feeds back at the same time multiple subband CQIs, constructs a CQI report, and feeds it back to the base station. A device for periodic CQI feedback for carrier aggregation is also disclosed by the present invention. The method and device for CQI feedback in the present invention reduce the downlink scheduling delay during periodic CQI feedback, and improve the speed and efficiency of CQI feedback. A method for reducing scheduling blocking during periodic CQI feedback for carrier aggregation is also disclosed by the present invention. That is, priority levels of all the component carriers are randomized when a UE feeds back subband CQIs.

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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Patent Type & Authority Patents(China)
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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