Self-adapting switching method and device of transmission mode of LTE (Long Term Evolution) multi-antenna system

Abstract

The invention relates to a self-adapting switching method of a transmission mode of an LTE (Long Term Evolution) multi-antenna system, and the self-adapting switching method comprises the following steps that: a base station sets an appropriate transmission mode in a self-adapting way for a user by taking the SINR (Signal to Interference plus Noise Ratio), the movement speed and the geographic position of the user as judgment conditions. The self-adapting switching method comprises the following operation steps of: firstly initially determining multiple parameters, namely a polling period needed by transmission mode switching, a mode switching threshold value, a counter threshold value and a user movement speed threshold value; then determining transmitting data of an acquiescent transmission diversity mode; then calculating an SINR value according to CQI (Channel Quality Indicator) fed back by the user, and comparing the SINR value with a predetermined switching threshold; updating corresponding judgment time and triggering time counters; judging whether a mode switching condition is met or not; and switching a current mode into an ideal target mode, or continuously keeping the current mode to carry out data transmission. The self-adapting switching method disclosed by the invention can be used for regulating the mode switching threshold value and the user movement speed threshold value in real time by counting switching times within set time, thereby realizing the effective balance of network transmission efficiency and timeliness in the switching process.

Description

technical field [0001] The invention relates to a transmission mode adaptive switching method and device in an LTE multi-antenna input and multi-output system, and belongs to the technical field of wireless communication. Background technique [0002] The LTE physical layer uses Orthogonal Frequency Division Multiple Access (OFDMA) as the downlink multiple access transmission technology, which is suitable for frequency selective channels and high data rate transmission; its downlink supports multi-antenna technology, including spatial multiplexing Use, transmit diversity, and beamforming can obtain better array gain, spatial multiplexing gain, and diversity gain. [0003] According to the physical layer protocol of LTE R9, the user terminal UE can be set to 8 different transmission modes through semi-static configuration of high-level signaling. These 8 transmission modes correspond to the data processing process of different physical downlink shared channel PDSCH (Physical...

AI Technical Summary

Problems solved by technology

[0008] Existing multi-antenna mode switching algorithms, such as: link adaptation based on Exponential Effective SIR Mapping EESM (Exponential Effective SIR Mapping) and single antenna rate control PARC (Per Antenna Rate Control) combined spatial multiplexing and beamforming Switching between shapes, spatial multiplexing and switching between transmission diversity based on the minimum Euclidean distance, these methods are highly theoretical and complex, and are not easy to implement in actual systems

Moreover, the adaptive handover method in the existing literature considers all 8 transmission modes in the LTE system, but not all of them are applicable in the actual system, lacking pertinence and practicability

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