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Contention access method and device

A technology of competitive access and initial access, applied in the field of communication, can solve problems such as the inability to improve the ability of base stations to resolve conflicts, and achieve the effect of improving conflict resolution capabilities

Active Publication Date: 2017-11-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Embodiments of the present invention provide a contention access method and device to at least solve the problem in the related art that the ability of the base station to resolve conflicts cannot be improved when a conflict occurs

Method used

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  • Contention access method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] MSG3: The MSG3 data transmitted by the terminal for the first time can be successfully demodulated by the base station.

[0095] The terminal obtains TC-RNTI information from the received RAR data. In the initial random access technology of LTE, MSG3 is data containing UE ID and scrambled with TC-RNTI.

[0096] Suppose the signal S=[s 1 the s 2 the s 3 ... s n ] and K=[k 1 k 2 k 3 ...k m ] is the MSG3 data in LTE of two users scrambled with the same TC-RNTI, where n and m represent the number of symbols contained in one frame.

[0097] The sequence in the orthogonal sequence set adopts 4 long orthogonal sequences, such as the orthogonal sequence set:

[0098]

[0099] Suppose h i 、h j are the orthogonal sequences randomly selected by two users from H, then the improved MSG3 data are h i ×S, h j ×K.

[0100] Here it is assumed that the channel is ideal, then the data received by the base station side can be expressed as:

[0101] W=h i ×S+h j × K

[0...

Embodiment 2

[0109] MSG3: The MSG3 data previously transmitted by the terminal is not successfully demodulated by the base station, the terminal retransmits the MSG3 data, and each retransmission of each terminal uses the same orthogonal sequence for expansion.

[0110] Suppose the signal E=[e 1 e 2 e 3 ... e n ] and R=[r 1 r 2 r 3 ......r m ] are the MSG3 data of two users in LTE that need to be retransmitted and have the same TC-RNTI scrambling, where n and m represent the number of symbols contained in one frame.

[0111] The terminal uses the same orthogonal sequence as the previous transmission, instead of randomly selecting an orthogonal sequence from the set of orthogonal sequences. Assume that in the previous transmission, the orthogonal sequences used by the two users are h i and h j , then the improved MSG3 data are h i ×E, h j ×R.

[0112] Assuming that the channel is an ideal channel, then the data received by the base station can be expressed as:

[0113] U=h i ×...

Embodiment 3

[0128] MSG3: The MSG3 data previously transmitted by the terminal is not successfully demodulated by the base station, the terminal retransmits the MSG3 data, and each retransmission of each terminal is extended with a different orthogonal sequence.

[0129] Suppose the signal E=[e 1 e 2 e 3 ... e n ] and R=[r 1 r 2 r 3 ......r m ] are the MSG3 data of two users in LTE that need to be retransmitted and have the same TC-RNTI scrambling, where n and m represent the number of symbols contained in one frame.

[0130] The sequence in the orthogonal sequence set adopts 4 long orthogonal sequences, such as the orthogonal sequence set:

[0131]

[0132] The terminal randomly selects an orthogonal sequence from the orthogonal sequence set for each retransmission, that is, each user uses different orthogonal sequences for each retransmission.

[0133] Suppose the signal E=[e 1 e 2 e 3 ... e n ] and R=[r 1 r 2 r 3 ......r m ] are the MSG3 data of two users in LTE that ...

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Abstract

The invention provides a contention access method and device. In a long-term evolution LTE contention access process, terminal sides can select orthogonal sequences corresponding to terminals from K orthogonal sequences, wherein the K is an integer greater than or equal to 2. MSG3 is expanded through utilization of the selected orthogonal sequences, and the expanded MSG3 is sent to a base station. If a conflict occurs, namely the MSG3 of a plurality of terminals is scrambled through utilization of the same TC-RNTI, the base station can demodulates a plurality of users at the same time according to the expanded MSG3 and issues conflict resolution successful information to the terminals by additionally increasing bits. Through application of the method and the device, the conflict problem generated when the plurality of users access the base station at the same is solved and the conflict solution capability of the base station is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a contention access method and device. Background technique [0002] Long-Term Evolution (LTE for short) random access technology can be divided into two types, one is a non-contention random access technology, and the other is a contention random access technology. For the non-competitive random access technology, the base station can assign a specific Physical Random Access Channel (PRACH) resource to the terminal to send a dedicated preamble sequence; for the contention random access technology, the base station cannot assign the terminal Preamble and PRACH resources. The process of LTE competitive random access technology can be divided into the following steps: [0003] Step 1: The terminal sends a preamble sequence to inform the base station that there is a random access request, and at the same time enables the base station to estimate the transmission delay between it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0833H04W74/0841H04W74/08
Inventor 袁志锋李超
Owner ZTE CORP
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