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Method and device for switching transmission modes

A transmission mode, switching device technology, applied in wireless communication, error prevention/detection using return channel, electrical components, etc., can solve problems such as undefined transmission mode

Active Publication Date: 2013-02-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, how to trigger switching between transmission modes has not been defined in the related art

Method used

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  • Method and device for switching transmission modes
  • Method and device for switching transmission modes
  • Method and device for switching transmission modes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] Example 1: The MAC sets a protection timer, and if the MAC does not receive the RRC response to the transmission mode switching request within the time indicated by the protection timer, the original transmission mode is maintained.

[0040] In this example 1, considering that RRC may be too busy to process the transmission mode switching request and does not respond to the transmission mode switching request, the MAC is in the process of waiting for the RRC feedback reconfiguration completion notification for a long time. This preferred embodiment can Set the protection timer according to the preset time. If the protection timer expires, the MAC will end the waiting process and enter the normal process. In this way, the transmission mode between the MAC and the UE can be prevented from being in an uncertain state for a long time, thereby improving the reliability of the transmission.

example 2

[0041] Example 2: MAC receives the first reconfiguration failure notification from RRC, where the first reconfiguration failure notification is used to indicate that RRC does not accept the transmission mode switching request; the original transmission mode is maintained between the MAC and the UE.

[0042] In this example 2, considering that RRC may not accept the transmission mode switching request due to configuration reasons, in this preferred embodiment, when the MAC receives the reconfiguration failure notification caused by the RRC not accepting the transmission mode switching request, it will end the transmission mode switching as soon as possible. When the transmission mode is uncertain due to the interaction of signaling, the original transmission mode of the UE is maintained and the normal process is entered.

example 3

[0043] Example 3: The MAC receives the second reconfiguration failure notification from the RRC, where the second reconfiguration failure notification is used to indicate the UE's transmission mode reconfiguration failure or the RRC transmission mode reconfiguration timeout; MAC and RRC perform exception handling.

[0044] Considering that the UE may fail to reconfiguration or the RRC transmission mode reconfiguration timeout due to the loss of DCCH, in the first case, that is, the UE reconfiguration fails, the UE will initiate a re-connection request, that is, re-initiate random access. At this time, the MAC It will also enter the random access process; for the second case, that is, the RRC transmission mode reconfiguration timeout caused by the loss of DCCH, at this time RRC cannot determine whether the UE reconfiguration is completed. RRC should deal with this situation abnormally, such as reconfiguration. The UE transmission mode is reconfigured, and the MAC can temporarily ke...

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Abstract

The invention discloses a method and a device for switching transmission modes. The method comprises the steps of: determining to carry out switching on the transmission modes by an MAC (Media Access Control); sending a transmission mode switching request to an RRC (Radio Resource Control), wherein the transmission mode switching request is used for requesting the RRC to carry out transmission mode reassortment on UE (User Equipment); and carrying out the transmission mode switching by the MAC according to a reassortment completion notice from the RRC, wherein the reassortment completion notice is used for indicating the completion of the reassortment of the transmission modes of the UE.

Description

Technical field [0001] The present invention relates to the field of communications, and in particular, to a transmission mode switching method and device. Background technique [0002] In the Long-Term Evolution (LTE) Release 9 protocol, 8 downlink transmission modes are defined. Among them, Transmission Mode (TM) 1 is a single-port port 0 transmission; TM2 is a transmit diversity mode; TM3 The main transmission scheme of TM4 is Cyclic Delay Diversity (CDD); the main transmission scheme of TM4 is closed-loop spatial multiplexing; the main transmission scheme of TM5 is MU-MlMO; TM6 is single-layer precoding; TM7 The main transmission scheme is single-stream beamforming (BF), which uses single-port port5 transmission; TM8 supports dual-stream BF, which uses port7 and port8 transmission, and also includes single-stream BF, which uses port7 or port8 transmission . It should be noted that in addition to the main transmission scheme, TM3 ~ TM8 also include a transmit diversity trans...

Claims

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Application Information

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IPC IPC(8): H04W36/00H04W72/12H04L1/16
Inventor 付瑞颖
Owner ZTE CORP