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A method and device for collision detection

A technology of conflict detection and timing detection, which is applied in the field of low-orbit satellite communication, can solve the problems of extended access time and low access efficiency, and achieve the effect of reducing access delay and improving access efficiency

Active Publication Date: 2022-07-29
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] If the traditional four-step process is used for contention-based random access, the access time will be prolonged and the access efficiency will be low

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  • A method and device for collision detection
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  • A method and device for collision detection

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Embodiment Construction

[0063] In the present invention, the term "and / or" describes the association relationship between associated objects, indicating that there can be three kinds of relationships, for example, A and / or B, which can mean that A exists alone, A and B exist simultaneously, and B exists alone. a situation. The character " / " generally indicates that the associated objects are an "or" relationship.

[0064] In the present invention, the term "plurality" refers to two or more, and other quantifiers are similar.

[0065] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scop...

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Abstract

The present invention provides a method and device for collision detection. The method is applied to a network side device, and the method includes: receiving a random access sequence sent by a user terminal, where the random access sequence includes a preamble sequence and a label sequence; and synchronously completing the preamble sequence based on the random access sequence The timing detection and the conflict detection of the label sequence; wherein, the physical root index u of the preamble sequence 1 and the physical root index u of the label sequence 2 Coprime. The invention proposes a low-orbit satellite collision detection scheme based on tag sequence, and introduces tag sequence for collision detection in the random access process, so that collision detection and timing detection are completed in the same step. The contention-based random access of low-orbit satellites can be simplified into two steps, which greatly reduces the access delay and improves access efficiency.

Description

technical field [0001] The invention relates to the field of low-orbit satellite communications, and in particular, to a method and device for conflict detection. Background technique [0002] In the low-orbit satellite communication system, due to the long distance between the satellite and the ground, the signal transmission delay is large. The contention-based random access process is divided into four steps. The main work of the first two steps is the transmission detection and feedback of the preamble. The timing advance TA (time advance) obtained by detection and calculation can be used for uplink time synchronization. Therefore, the first two steps are mainly used for the completion of uplink synchronization. The main work of the next Msg3 (message 3, message 3) and Msg4 (message 4, message 4) is to resolve the contention. The base station assigns a unique and legal user identity to the terminal that initiates access, so as to perform subsequent uplink data transmiss...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04B7/185
CPCH04W74/0833H04W74/0858H04B7/1851
Inventor 李立华方红雨
Owner BEIJING UNIV OF POSTS & TELECOMM