Enhancement method and device of random access channel-less (RACH-less) switching, base station and terminal

An enhanced device and non-random technology, applied in the field of communication applications, can solve the problems of TA errors, RRC connection reconfiguration completed message data is difficult to receive reliably, etc., to achieve the effect of improving the reliability of reception

Active Publication Date: 2018-08-07
BAICELLS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an enhanced method, device, base station and terminal for non-random access handover to solve the problem of error in TA measured by UE during non-random access handover. , it is easy to cause the problem that the RRC connection reconfiguration completion message and subsequent uplink data are difficult to receive reliably

Method used

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  • Enhancement method and device of random access channel-less (RACH-less) switching, base station and terminal
  • Enhancement method and device of random access channel-less (RACH-less) switching, base station and terminal
  • Enhancement method and device of random access channel-less (RACH-less) switching, base station and terminal

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no. 1 example

[0039] Such as figure 1 As shown, the embodiment of the present invention provides an enhanced method for non-random access handover, which is applied to a base station, and the enhanced method includes:

[0040] Step 101: During the non-random access handover process, if the radio resource control RRC connection reconfiguration complete message sent by the terminal is successfully obtained, measure Time advance amount TA adjustment value.

[0041] In the non-access handover process, the UE obtains the transmission resource (transmission signal) of the RRC connection reconfiguration completion message through the target base station or the source base station. Here, the transmission signal used to transmit the RRC connection reconfiguration completion message can be specifically a physical uplink shared The channel PUSCH transmits signals. Specifically, the above step 101 may specifically include: measuring the TA adjustment value according to the acquired physical uplink sh...

no. 2 example

[0054] Such as image 3 As shown, the embodiment of the present invention provides an enhanced method for non-random access handover, which is applied to a base station, including:

[0055] Step 301: In the process of non-random access handover, if the radio resource control RRC connection reconfiguration complete message sent by the terminal is successfully obtained, according to the acquired physical uplink shared channel used to transmit the above RRC connection reconfiguration complete message PUSCH transmits signals, and measures the TA adjustment value.

[0056] In a specific embodiment of the present invention, the above TA adjustment value may be measured according to the cyclic prefix CP, the demodulation reference signal DMRS or the sounding reference signal SRS in the PUSCH transmission signal, which will be described respectively below.

[0057] (1) Measure the above TA adjustment value according to the cyclic prefix CP in the PUSCH transmission signal.

[0058] ...

no. 3 example

[0071] The embodiment of the present invention also provides an enhanced method for non-random access handover, which is applied to a base station, and the enhanced method includes:

[0072] In the process of non-random access handover, if the radio resource control RRC connection reconfiguration complete message sent by the terminal is not successfully obtained, and the number of transmissions of the RRC connection reconfiguration completion message does not reach the preset maximum number of retransmissions, the user performing extended processing in the time window for obtaining the resource acquisition of the RRC connection reconfiguration complete message, and using the resource obtained after the time window extension processing to obtain the RRC connection reconfiguration complete message resent by the terminal, or

[0073] Extending the length of the CP of the cyclic prefix of the obtained resources, and using the obtained resources after the CP length extension process...

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Abstract

The invention provides an enhancement method and device of random access channel-less (RACH-less) switching, a base station and a terminal. The problem that a RRC connection reconfiguration completionmessage and subsequent uplink data are hard to be reliably received if the error adjusting is not performed on TA (timing advance) of UE when the TA measured by the UE is in error in the RACH-less witching process is solved. The method comprises the following steps: measuring a TA adjusting value according to an acquired transmission signal for transmitting the RRC connection reconfiguration completion message if the radio resource control RRC connection reconfiguration completion message sent by the terminal is successfully acquired in the RACH-less switching process; sending the measured TAadjusting value to the terminal, thereby enabling the terminal to adjust the TA measured by the terminal according to the TA adjusting value, therefore, the error of the UE TA can be adjusted, the receiving reliability of the RRC connection reconfiguration completion message is improved, and then the receiving reliability of the subsequent uplink transmission data of the UE is improved.

Description

technical field [0001] The present invention relates to the technical field of communication applications, in particular to a non-random access handover enhancement method, device, base station and terminal. Background technique [0002] In the current Long Term Evolution (LTE) R14 system, in order to reduce the delay caused by handover, non-random access (RACH-less) handover is introduced, and the time for the user equipment (User Equipment, UE) to perform the target cell Timing advance (TA) is calculated, and then the calculated TA is used to perform uplink transmission in the target cell. [0003] In the TA of the target cell calculated by the UE, due to the delay of UE measurement, the measurement error and the accumulation of measurement errors in the calculation, there may be a large error in the TA calculated by the UE, which may cause the UE to send the radio resource control ( When the Radio Resource Control (RRC) connection reconfiguration complete message is rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02H04W74/04H04W76/27
CPCH04W24/02H04W74/04
Inventor 董洪孙立新丁颖哲周明宇
Owner BAICELLS TECH CO LTD
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