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A method and system for realizing rach synchronization

A technology of timing advance and random access response, applied in synchronization devices, multi-frequency code systems, electrical components, etc., and can solve problems such as inability to achieve RACH synchronization

Inactive Publication Date: 2017-07-04
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method and system for realizing RACH synchronization, so as to solve the problem that RACH synchronization cannot be realized in the case of large eNB coverage in the current prior art

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  • A method and system for realizing rach synchronization
  • A method and system for realizing rach synchronization
  • A method and system for realizing rach synchronization

Examples

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no. 1 example

[0034] In the first embodiment of the present invention, a method for realizing RACH synchronization, such as figure 1 shown, including the following steps:

[0035] Step S101 , when the user equipment UE sends a preamble for random access to the eNB, the eNB calculates a timing advance of initial timing based on the preamble. The unit of the timing advance is 16Ts.

[0036] Specifically, since RACH synchronization is an uplink synchronization process, the purpose of the UE sending the preamble is to randomly access the eNB. The eNB correlates the received preamble sequence with the local transmission sequence to obtain the detection peak, and the deviation between the detection peak and the ideal peak position without time offset is the timing advance. This content is a well-known technology in the art, so it will not be described in detail here.

[0037] Step S102, when the eNB coverage radius required by the application scenario is greater than 160km, the eNB chooses to ...

no. 2 example

[0048] In the second embodiment of the present invention, a system for realizing RACH synchronization, such as image 3 shown, including the following components:

[0049] eNB100 is used to calculate the timing advance of initial timing based on the preamble sequence when UE200 sends the preamble sequence used for random access, and the unit of the timing advance amount is 16Ts; when the eNB100 coverage radius required by the application scenario When it is greater than 160km, eNB100 chooses to use the timing advance command TAC bit in the random access response message or use the reserved bit and the TAC bit together to carry the timing advance according to the timing advance, and then transmit the time advance The random access response message is sent to UE200.

[0050] Specifically, the eNB100 correlates the received preamble sequence with the local transmission sequence to obtain the detection peak value, and the deviation between the detection peak value and the ideal p...

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Abstract

A method and system for implementing RACH synchronization are disclosed. The method includes: when a UE transmits a preamble sequence for random access to an eNB, the eNB calculating, based on the preamble sequence, a timing advance for initial timing, wherein the unit of the timing advance is 16Ts and Ts=[1 / (15000×2048)] seconds; when an eNB covering radius required by the application scenario is greater than 160km, the eNB selecting, according to the timing advance, to use a TAC bit or a reserved bit together with the TAC bit in a random access response message, to carry the timing advance, and then issuing the random access response message carrying the timing advance to the UE; and after receiving the random access response message, the UE judging whether the reserved bit is used, if so, determining the initial timing based on the timing advance carried by the reserved bit together with the TAC bit, and if not, determining the initial timing based on the timing advance carried by the TAC bit.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and system for realizing RACH (Random Access Channel, random access channel) synchronization. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, TA (Time Advance, time advance) is a timing deviation used to characterize the eNB (evolved NodeB, evolved base station) receiving the data sent by the UE (UserEquipment, user equipment) parameters. The initial timing is carried out through Preamble (preamble sequence). Specifically, the physical layer of the eNB measures the initial timing TA according to the received Preamble sent by the UE, and then the physical layer of the eNB reports the measured initial timing TA to the MAC (Medium Access Control, media access control) layer, and the eNB The MAC generates TAC (TimingAdvance Command, time advance command). The TAC is sent by the eNB to the UE through a MAC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04L27/26
CPCH04W56/0045H04W74/08
Inventor 李美娟
Owner ZTE CORP
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