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Method for obtaining and using CQI in LTE transmission mode 7

A transmission mode and downlink technology, applied in space transmit diversity, digital transmission system, electrical components, etc., can solve the problems of multi-antenna beamforming gain loss, etc., to improve throughput and spectrum utilization, and achieve performance gain , improve the effect of completeness and accuracy

Inactive Publication Date: 2010-06-16
ZTE CORP
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a method for obtaining and using CQI in LTE transmission mode 7, which can solve the problem of multi-antenna beamforming gain loss caused by obtaining CQI through common pilots when using transmission mode 7 technical problem

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  • Method for obtaining and using CQI in LTE transmission mode 7
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  • Method for obtaining and using CQI in LTE transmission mode 7

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

[0027] In the version of the existing LTE standard, the UE needs to obtain the CQI according to the pilot and give feedback. However, in transmission mode 7, common pilots and UE-specific pilots exist at the same time. The present invention proposes a method for reporting CQI and how the base station uses the CQI when transmission mode 7 is adopted, such as figure 2 As shown, in the present invention, the UE obtains the CQI through the common pilot, and directly reports the CQI, and the base station allocates resources for the user according to the reported CQI. If the user has a service to send, the base station first corrects the reported CQI, The corrected CQI is used to select the MCS for the user.

[0028] LTE transmission mode 7 ...

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Abstract

The invention discloses a method for obtaining and using channel quality indication CQI in an LTE transmission mode 7, which is used for solving the technical problem that the CQI is obtained by public pilot frequency to cause the figuration gain loss of a multi-antenna beam. In the technical scheme, a UE obtains the CQI by the public pilot frequency, the CQI is directly reported to a base station, and the base station distributes a resource for a user according to the reported CQI; and if the user has a service to be transmitted, the base station selects an MCS for the user by the corrected CQI after the base station firstly corrects the reported CQI. By the invention, the integrality and the accuracy of the feedback of the CQI during the transmission mode 7 can be enhanced, the performance gain of a multi-antenna mode is realized, and the throughput and the spectrum utilization rate of a subdistrict are enhanced.

Description

technical field [0001] The present invention relates to the field of mobile communications, and in particular to the reporting of a mobile terminal Channel Quality Indicator (CQI) using transmission mode 7 in a Long Term Evolution (LTE), that is, using antenna port 5 and how to use the CQI on the base station side. CQI is a method for resource allocation and determination of a modulation coding scheme (Modulation coding scheme, MCS) of a mobile terminal. Background technique [0002] In the current version of the LTE standard, the calculation of the downlink CQI is determined according to the received signal quality of the pilot. When the transmission mode 7 is adopted, the common pilot and the dedicated pilot exist at the same time, it needs to be clarified whether the CQI fed back by the mobile terminal (User Equipment, UE) is extracted according to the common pilot or the dedicated pilot. [0003] If the UE dedicated pilot (hereinafter referred to as URS) is used to obta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B7/06
Inventor 姜静于辉梁枫
Owner ZTE CORP