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Method and device for sending and receiving non-competition-based random access response messages

A technology of random access response and random access, applied in electrical components, wireless communication and other directions, which can solve the problems of loss of uplink synchronization and inability to perform uplink transmission.

Active Publication Date: 2013-07-31
ALCATEL LUCENT SHANGHAI BELL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For R8, R9, and R10, when performing random access, the user terminal must have lost uplink synchronization with the base station, so it cannot perform any uplink transmission until it re-synchronizes with the base station

Method used

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  • Method and device for sending and receiving non-competition-based random access response messages

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Embodiment Construction

[0034] As mentioned above, for several R11 CFRA RA scenarios of the secondary cell (Scell), only the TA field is required, but the uplink resource allocation is not required. Also, TC-RNTI is not required at all. Therefore, the inventor proposes to optimize the CFRA RA format of R11:

[0035] ●TA is required;

[0036] ● Uplink resource allocation is optional;

[0037] • The TC-RNTI field is removed. For cross-cell scheduled RSR, a specific cell ID, that is, a specific cell identity is provided to solve the problem of preamble confusion.

[0038]So far, how to send the RAR MAC PDU of the secondary cell in R11 has not yet been decided. But as analyzed above, no matter which option (b2 / b3) is finally selected, the new RAR format must be defined. In particular, if b2 is finally selected, the specific cell ID should be included in the RAR payload to resolve the case of preamble confusion. It can be seen here that the CFRA operation of R11 can provide an opportunity to optimiz...

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Abstract

The invention provides a method and a device for sending and receiving non-competition-based random access response messages, wherein the method for sending the random access response messages to user terminals in a base station comprises the following steps: receiving non-competition-based random access lead codes coming from multiple user terminals and randomly accessed through a cell; and adopting an optimized random access response message format to send optimized random access response messages accessed in the cell to the user terminals, wherein the optimized random access response messages comprise timing advanced messages, and the optimized random access response message format utilizes padding bits in traditional random access response messages and adopts an indicator to distinguish RAP (Rrandom Access Response) information or real filling information, or utilizes media access control elements to send the non-competition-based random access response messages of the user terminals, which are accessed randomly through the cell.

Description

technical field [0001] The present invention relates to a random access response message, in particular to a method and device for sending and receiving a non-contention based random access response message in a base station and a user terminal. Background technique [0002] According to the status of the current standard, the random access (Random Access, RA) in the physical random access channel (Physical Random Access Channel, PRACH) of version 11 (R11) is the same as that of version 8, 9, 10 (R8 / 9 / 10 ) has many new features: [0003] ● R11 The contention-free RA (CFRA) based on non-contention can be triggered by the base station and performed on the secondary cell (Scell). [0004] ●The non-contention-based random access CFRA triggered by the base station on the secondary cell (Scell) can be triggered by any of the following scenarios: [0005] - Uplink (UL) synchronization from the timing advance group (secondary Time Advance Group, sTAG); [0006] - Determine the sT...

Claims

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Application Information

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IPC IPC(8): H04W74/08
Inventor 杨涛林晓翔
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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