A non-orthogonal multiple access based random access method, terminal and base station

CN115942503BActive Publication Date: 2026-07-10CHINA MOBILE COMM LTD RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA MOBILE COMM LTD RES INST
Filing Date
2021-09-15
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing 5G systems only support orthogonal multiple access technology, which means that the message Msg3 of multiple terminals on the same physical uplink shared channel resources cannot be successfully received by the base station at the same time. As a result, during the conflict resolution process, only one terminal identifier is identified, while the identifiers of the other terminals are unknown, and random access fails.

Method used

Non-orthogonal multiple access technology is used to transmit and receive Msg3 between the base station and the terminal. The serial interference cancellation and message passing algorithm are used to identify the identifiers of multiple terminals and assign them unique C-RNTIs, so as to enable multiple terminals to access simultaneously.

Benefits of technology

It increases the probability of successful random access, allows multiple colliding terminals to access at once, and improves the system's access efficiency.

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Abstract

The application discloses a random access method based on non-orthogonal multiple access, a base station and a terminal. The method comprises the following steps: a base station receives a message Msg3 sent by a plurality of terminals, the Msg3 is sent and received in a non-orthogonal multiple access mode; wherein the plurality of terminals collide when sending Msg1; the base station identifies terminal identities of at least part of the plurality of terminals based on the Msg3 sent by the plurality of terminals; and the base station determines respective cell-radio network temporary identities C-RNTIs of the at least part of the terminals through Msg4.
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Citation Information

Patent Citations

  • System access resource allocation method and device

    CN107105504A