Feedback report during two-step random access

By managing flow control feedback reports based on whether the data channel portion includes an RRC message during a two-step random access process, the UE suppresses invalid decoding, thereby solving the problem of UE wasting resources in the prior art and achieving more efficient communication.

CN115211216BActive Publication Date: 2025-09-19QUALCOMM INC
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Patent Information

Application Number
CN202180017808.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-03-04
Filing Date
2021-03-05
Publication Date
2025-09-19
Estimated Expiration
2041-03-05

AI Technical Summary

Technical Problem

In the existing two-step random access process, after receiving a response from the base station, the UE may waste power and resources trying to decode an invalid data channel portion, resulting in increased delay and overhead.

Method used

The UE manages the flow control feedback report, suppression or decoding process by determining whether the data channel part includes a radio resource control message, for example, reporting ACK and suppressing decoding of the data channel part if there is no RRC message when the TA timer is running.

Benefits of technology

The time delay and overhead in the random access process are reduced, power consumption is saved, and communication efficiency is improved.

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Abstract

Methods, systems, and apparatus for wireless communications are described. A UE may send a random access message to a base station and receive from the base station at least a control channel portion of a response to the random access message, wherein the response may also include a data channel portion. The UE may then manage flow control feedback reporting to the base station based on whether the data channel portion includes a radio resource control (RRC) message using the techniques described herein. For example, if the data channel portion does not include an RRC message and a TA timer at the UE is running (e.g., regardless of whether the UE is able to or attempts to decode the data channel portion because the data channel portion may only include TA information that may be useless to the UE), the UE may report an acknowledgment of the response.
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