Method and system of determining downlink MCS

Abstract

The invention discloses a method and system of determining a downlink MCS, belonging to the mobile communication technical field. The method comprises the steps of: S1, UE obtaining the current SINR value of a downlink channel, and reporting the current SINR value to a base station; and S2, the base station receiving the current SINR value, and then determining a downlink initial MCS according to UE service type to be transmitted, and the current SINR value. The method and system determine a downlink initial MCS according to the UE service type to be transmitted, and the current SINR value, allow the base station to flexibly select a suitable MCS according to conditions of different service types, avoid the case in which an initial MCS selected according to a CQI is too fixed, and does meet special requirements of a certain service, and improve data transmission efficiency and system performance.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method and system for determining downlink MCS. Background technique [0002] In the existing mobile communication system, the demand for high-speed data services continues to grow. In order to transmit downlink data faster and more accurately, the base station needs to adaptively select a modulation and coding scheme (MCS). [0003] In order to determine the modulation and coding scheme (MCS) for downlink transmission, the base station often needs the user equipment (UE) to estimate the signal-to-interference ratio of the received signal and determine the feedback channel quality indicator (CQI), and then the base station determines the downlink transmission according to the received CQI The MCS used is called a CQI feedback mechanism, but this method requires real-time feedback of CQI, resulting in excessive feedback overhead. [0004] In order to reduce the fee...

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Problems solved by technology

[0003] In order to determine the modulation and coding scheme (MCS) for downlink transmission, the base station often needs the user equipment (UE) to estimate the signal-to-interference ratio of the received signal and determine the feedback channel quality indicator (CQI), and then the base station determines the downlink transmission according to the received CQI The MCS used is called the CQI feedback mechanism, but this method requires real-time feedback of CQI, resulting in excessive feedback overhead

[0004] In order to reduce the feedback overhead, in the current mobile communication system (such as LTE230 system, etc.), the network side (base station) determines the method of downlink MCS according to the feedback information (confirmation ACK and non-confirmation NACK information). This method is based on the consideration of reliability. , follow the principle of "fast decline and slow rise", but before adjusting the downlink MCS, an initial downlink MCS needs to be selected by the network side, and the existing initial MCS selection is too fixed. For services with small data volumes, This will introduce a problem: that is, the MCS rises slowly, which affects the efficiency of data transmission. For systems with a large number of small data volume services, the system performance will be greatly affected.

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