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Method and device for switching multi-antenna transmission modes

A multi-antenna, transmit diversity technology, applied in the field of communication systems, can solve problems such as low channel correlation and receiving errors at the receiving end, and achieve the effects of reducing system overhead, avoiding mode switching, and quickly adapting

Inactive Publication Date: 2011-05-18
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual test, spatial multiplexing not only depends on the correlation of the channel, but also has high requirements on the channel quality, especially the signal-to-interference-noise ratio, and the channel correlation is low, that is, when RI>1, but when the signal-to-interference-noise ratio is low, Using spatial multiplexing to transmit, the receiver will also receive errors

Method used

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  • Method and device for switching multi-antenna transmission modes
  • Method and device for switching multi-antenna transmission modes
  • Method and device for switching multi-antenna transmission modes

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: Switching from diversity to multiplexing

[0039] master process, such as figure 2 As shown, the steps are as follows:

[0040] Step 201: Count the RI values ​​received by the MAC layer between the end of the last mode switch and the current moment, where the cumulative value of RI being 1 is expressed as: RINum 1 , the cumulative value of RI greater than 1 is RINum 2 ;Continuously received statistics of RI being 1 are respectively CONTI RI1 , the statistical value of continuously receiving RI greater than 1 is CONTI RI2 , the accumulated value threshold determined by the system is η accum _RI, continuous value threshold is η conti _RI.

[0041] Step 202: The BS counts the number of ACKs and NACKs received by the MAC layer between the end of the last mode switch and the current time, where the cumulative values ​​of ACK and NACK are expressed as: ACCUM ack and ACCUM nack , the statistical values ​​of consecutively received ACK and NACK are CONTI ...

Embodiment 2

[0052] Embodiment 2: Switching from Multiplexing to Diversity

[0053] master process, such as Figure 4 As shown, the steps are as follows:

[0054] Step 401: same as step 201.

[0055] Step 402: same as step 202.

[0056] Step 403: Further, the BS analyzes and judges the statistical value of RI, if the statistical cumulative value of RI CONTI RI1 greater than the cumulative threshold η accum , go to step 404; otherwise, go to step 405.

[0057] Step 404: Further, judge ACCUM nack greater than the third cumulative value threshold (e.g., cumulative value threshold η accum ), the main control module switches the unified transmission mode to diversity.

[0058] Step 405: When the cumulative value of RI is less than the cumulative value threshold, further if the continuous value of RI CONTI RI1 Greater than the continuous value threshold η conti _RI, go to step 406.

[0059] Step 406: further, if the continuous statistical value of NACK is greater than the third continu...

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Abstract

The invention provides a method and a device for switching multi-antenna transmission modes, which is used for selecting an optimum transmission mode for a device, thus accelerating speed and reducing errors. The method for switching the multi-antenna transmission modes from transmit diversity (TD) to spatial multiplexing (SM) comprises the following steps: making statistics of a first accumulative value and / or a first continuous value of user equipment (UE) within preset time in the event that rank indication (RI) is more than 1; and when the first accumulative value is more than the threshold value and / or when the first continuous value is more than the threshold value, carrying out master switching so as to switch the multi-antenna transmission modes from the TD mode to the SM mode. In addition, the invention further provides the method and the device for switching the multi-antenna transmission modes from the SM mode to the TD mode.

Description

technical field [0001] The present invention relates to a communication system, and more particularly, to a multi-antenna transmission mode switching method and device. Background technique [0002] In a wireless communication system, in order to improve data transmission rate and system throughput, MIMO (Multi-Input and Multi-Output) technology can be used. Usually, multiple antennas are used for two purposes: one is to improve data reliability; the other is to increase data transmission rate. In order to achieve higher reliability and higher data rate, a data reliability enhancement scheme is employed in poor channel conditions, and a data rate enhancement scheme is employed in good channel conditions. The former utilizes the spatial diversity gain provided by the MIMO channel, and the latter utilizes the spatial multiplexing gain provided by the MIMO channel. Therefore, MIMO technology can be roughly divided into two categories: transmit diversity (TD, Transmit Diversity...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/04H04L1/06H04L1/16
Inventor 张娟王立平
Owner ZTE CORP
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