NR UE MsgB Reception Control for Two-Step Random Access
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Solution Overview
Problem
In the contention based random access procedure for NR radio communication systems, the two-step random access procedure requires decoding a large number of transport blocks including MsgBs directed to other UEs, leading to increased processing requirements, higher UE cost, battery consumption, and latency.
Innovation Solution
The user equipment includes a transmission unit for sending a first message with a random access preamble, a reception unit for receiving second messages for contention resolution, and a control unit that controls the reception operation based on information associated with an identifier in the second messages, allowing the UE to stop reception operations for MsgB depending on the received information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE decodes all transport blocks in MsgB including those directed to other UEs, then complete message reception is ensured, but processing complexity and battery consumption increase
Solution Approach 1:
The patent extracts and processes only the necessary information (identifier matching) from the MsgB transport blocks without fully decoding all blocks. The UE extracts identifier information to determine whether further decoding is needed, thereby avoiding unnecessary processing of transport blocks not intended for it.
Solution Approach 2:
Instead of performing excessive action by decoding all transport blocks, the patent applies partial action by only decoding or processing the identifier portion of transport blocks to determine relevance, and only fully decoding transport blocks that are actually intended for the UE.
2Reliability
If the UE decodes all transport blocks in MsgB, then no messages are missed, but battery consumption increases
Solution Approach 1:
The patent extracts only the essential identifier information from transport blocks to determine whether they are intended for the UE, avoiding the energy-intensive process of fully decoding all transport blocks. This selective extraction significantly reduces battery consumption while ensuring no relevant messages are missed.
Solution Approach 2:
The patent performs partial decoding only when necessary (when identifier matching indicates the message is for this UE), rather than performing excessive full decoding of all transport blocks, thereby optimizing battery usage.
3Reliability
If the UE decodes all transport blocks in MsgB, then all messages are received, but latency increases
Solution Approach 1:
The patent quickly extracts and compares identifier information from transport blocks to immediately determine which ones are relevant, avoiding time-consuming full decoding of irrelevant blocks. This significantly reduces processing latency while ensuring complete reception of intended messages.
Solution Approach 2:
The patent performs minimal partial decoding of identifier fields first, then only fully decodes transport blocks that match the UE's identifier, thereby avoiding excessive processing time on irrelevant messages and reducing overall latency.
Data Source
AI summary
A user equipment includes a transmission unit that transmits a first message including a random access preamble in a two-step random access procedure, a reception unit that receives one or more second messages for contention resolution in the two-step random access procedure, and a control unit that controls an operation to receive the second messages based on information associated with an identifier of the first message included in the second messages.