Terminal and communication method

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By utilizing the 4-step RACH parameters set in the pre-defined other uplink bandwidth part when the parameters are not set in the 2-step RACH process, the problem of unset parameters in the 2-step RACH configuration is solved, and appropriate terminal action and signaling overhead are achieved.

CN114642070BActive Publication Date: 2025-09-19NTT DOCOMO INC

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Patent Information

Application Number: CN201980101969.9
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2019-11-07
Publication Date: 2025-09-19
Estimated Expiration: 2039-11-07

Application Information

Patent Timeline

07 Nov 2019

Application

CN201980101969.9

19 Sep 2025

Publication

CN114642070B

IPC: H04W74/08; H04W74/0833; H04W74/0836

CPC: Y02D30/70; H04W74/002; H04W74/0833; H04W72/0453; H04W74/0836

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Application Domain

High level techniques Wireless communication

Technology Topics

Telecommunications Random-access channel

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AI Technical Summary

Technical Problem

In the 2-step RACH process, when some parameters are not set as 2-step RACH-specific parameters, the terminal cannot operate properly, especially how to perform 2-step RACH configuration in the bandwidth part where the 4-step RACH parameters are not set.

Method used

The terminal configures and operates by using the 4-step RACH parameters set in other uplink bandwidth parts that are pre-defined or notified as parameters for 2-step RACH without explicitly setting the 2-step RACH parameters, including the parameters of the initial, default or other uplink bandwidth parts.

Benefits of technology

This enables the terminal to perform appropriate two-step RACH operations without setting parameters in the terminal, thereby reducing signaling overhead and improving system efficiency.

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Abstract

A terminal comprises: a control unit that, when a two-step random access channel (RACH) configuration is set for a bandwidth part (BWP), performs at least one of the following actions: reusing parameters of a RACH configuration set in another uplink BWP as parameters for the two-step RACH configuration, newly setting parameters for the two-step RACH configuration, or setting default parameters as parameters for the two-step RACH configuration; and a transmission unit that transmits a two-step RACH message A using the parameters of the two-step RACH configuration.

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