Random Access Beam Selection for Repeated Msg1 and Msg3
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Solution Overview
Problem
The random access procedure in future radio communication systems, such as NR, is indefinite, leading to reduced communication throughput unless coverage enhancement is achieved.
Innovation Solution
A terminal that receives information related to random access procedure and determines beams for message repetitions, enhancing coverage by optimizing the transmission of messages 1 and 3 using specific beam configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access procedure uses indefinite coverage enhancement, then communication throughput is reduced, but implementing definite procedure increases system complexity
Solution Approach 1:
The patent applies parameter changes by dynamically selecting beam directions for message 3 repetitions based on the beam directions used for message 1 repetitions. The terminal determines beam directions for message 3 by transforming or mapping the beam direction parameters from message 1, creating a definite and predictable procedure that improves throughput while managing complexity through parameter transformation rather than procedural complexity.
2Reliability
If beam directions for message 3 are not determined based on message 1 beams, then coverage enhancement is insufficient, but determining beams increases processing complexity
Solution Approach 1:
The patent applies preliminary action by determining beam directions for message 3 repetitions in advance based on the already-known beam directions for message 1 repetitions. The terminal pre-calculates or pre-determines the message 3 beam directions using transformation rules applied to message 1 beam directions, eliminating the need for real-time beam selection and reducing processing complexity while ensuring adequate coverage enhancement.
Solution Approach 2:
The patent uses parameter changes by transforming beam direction parameters from message 1 to message 3. Instead of independently determining message 3 beams, the system transforms the message 1 beam direction parameters through defined rules (such as rotation or mapping operations), which simplifies processing while maintaining effective coverage enhancement through systematic parameter transformation.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives information related to random access procedure including a plurality of repetitions of a message 1 and a plurality of repetitions of a message 3, and a control section that, based on the information and based on one or more first beams to be used for the plurality of repetitions of the message 1, determines one or more second beams to be used for the plurality of repetitions of the message 3. According to an aspect of the present disclosure, it is possible to enhance coverage in random access procedure.