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

A multi-antenna system and transmission mode technology, applied in wireless communication, electrical components, etc., can solve problems such as difficult implementation, high complexity, lack of pertinence and practicability, and achieve easy implementation, low complexity, and good promotion and application foreground effect

Inactive Publication Date: 2013-06-26
BEIJING UNIV OF POSTS & TELECOMM
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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 d

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

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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] see figure 1 , introduces the overall operation steps of the transmission mode adaptive switching method of the LTE multi-antenna system of the present invention: the base station adaptively sets an appropriate transmission mode for the user according to the user's signal-to-interference-noise ratio, moving speed and geographical location as judgment conditions. Including the following steps:

[0033] Step 1, the base station initializes and sets multiple parameters involved in the transmission mode switching (including: polling cycle, inter-mode switching threshold, counter threshold and user moving speed threshold, as shown in the following table):

[0034]

[0035]

[0036] These parameters are described in detail below: .

[0037...

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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...

Claims

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Application Information

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IPC IPC(8): H04W36/00
Inventor 纪晓东贾玉玮李远彭木根靳浩王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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