Method for determining user equipment downlink MCS

A user equipment and level technology, applied in electrical components, digital transmission systems, error prevention, etc., can solve the problems of reducing the accuracy of CQI, the large frequency shift of uplink control information, and the inability to receive correctly, so as to reduce the signaling overhead Effect

Active Publication Date: 2014-12-24
POTEVIO INFORMATION TECH
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Problems solved by technology

In a communication system such as high-speed rail, there is not only the problem that the accuracy of CQI is reduced due to delay

Method used

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  • Method for determining user equipment downlink MCS

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Embodiment Construction

[0015] The high-speed rail communication system has its own characteristics. The channel conditions of the user equipment in the same carriage are basically the same. During the driving process, the channel environment will occasionally change, such as entering and leaving the tunnel, but most of the time, the channel environment remains constant. Utilizing the above features, the present application provides an effective CQI calculation method, which reduces signaling overhead and can timely adjust the MCS level of the user equipment. In the LTE system, 32 fixed MCS levels are divided according to channel conditions. The better the channel, the higher the MCS level used, and the higher the data transmission rate, and vice versa.

[0016] In order to make the technical principles, features and technical effects of the technical solution of the present application clearer, the technical solution of the present application will be described in detail below in conjunction with spe...

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Abstract

The invention discloses a method for determining a user equipment downlink MCS. The method includes the steps that the initial MCS grades of all user equipment are set through a base station; the frequency deviation values of uplink data of the user equipment are measured through the base station, and users similar in absolute frequency value are classified into a big group; the user equipment in all the big groups is further classified into different small groups according to service types; for all the user equipment in the same small group, the ratio k of ACK feedbacks of all downlink services, which are received by F sub-frames, to all feedbacks is calculated; according to the relation between k and a preset threshold value, the MCS grades are adjusted. Compared with the prior art, signaling overheads can be reduced, and meanwhile the MCS grades of the user equipment can be adjusted in time.

Description

technical field [0001] The present application relates to the technical field of mobile communication, and in particular to a method for determining a downlink modulation and coding scheme (MCS, Modulation and Coding Scheme) of a user equipment (UE). Background technique [0002] In the communication system, the high-speed movement of the user equipment will cause rapid channel changes, and the channel quality indicator (CQI) information reported by the user equipment will reduce the accuracy due to delay. For example, in a high-speed rail system, user equipment generally travels at a speed exceeding 300 km / h. In a communication system such as high-speed rail, there is not only the problem that the accuracy of CQI is reduced due to delay, but also the problem that uplink control information cannot be received correctly due to a large Doppler frequency shift. The CQI value reported by the user equipment includes the user's MCS information, and different channel qualities det...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00
Inventor 于小红
Owner POTEVIO INFORMATION TECH
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