Multi-Beam Random Access Message Transmission in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable and efficient random access procedures, particularly in multi-beam environments, which can lead to increased latency and failure rates during connection establishment between user equipment (UE) and base stations.
Innovation Solution
The method involves determining and utilizing multiple beams for transmitting random access messages in a two-step random access procedure, allowing for improved reliability and reduced latency by using time, frequency, or space division multiplexing to separate beams, and employing beam sweeping techniques to enhance communication success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple beams are used for random access message transmission, then reliability is improved, but device complexity increases
Solution Approach 1:
The random access procedure is segmented into two distinct steps: (1) UE transmits preamble and payload in a shared random access occasion, and (2) base station responds with random access response and contention resolution information. This segmentation allows the system to manage multiple beams across different message exchanges rather than requiring all beams to be managed simultaneously in a single step, thereby improving reliability through multiple transmission opportunities while reducing the complexity of beam management in each individual step.
Solution Approach 2:
The UE performs preliminary beam selection and transmits the preamble and payload using selected beams before the base station responds. The base station then uses this preliminary information to determine appropriate beams for the random access response. This preliminary action allows the system to establish beam pairs early in the procedure, improving reliability through pre-established beam relationships while reducing the complexity of real-time beam management during the response phase.
2Reliability
If multiple beams are used for random access message transmission, then connection establishment success rate is improved, but latency increases
Solution Approach 1:
The preamble transmission and payload transmission are merged into a single shared random access occasion, allowing both to be transmitted using the same beam configuration. This merging eliminates the need for separate beam management procedures for preamble and payload, thereby improving connection establishment success rate through unified beam usage while reducing latency by avoiding additional beam switching and processing time between separate transmissions.
3Reliability
If beam sweeping techniques are employed, then message transmission reliability is improved, but procedure complexity increases
Solution Approach 1:
The base station dynamically determines the beams to use for transmitting the random access response based on the received preamble and payload from the UE. This dynamic beam selection allows the system to adapt to the actual channel conditions observed during the random access procedure, improving message transmission reliability through condition-based beam optimization while reducing procedure complexity by using simple decision logic rather than exhaustive beam sweeping.
Data Source
AI summary
Aspects described herein relate to determining multiple beams to use in transmitting messages in a random access procedure with one or more transmission/reception points (TRPs) of a cell, and transmitting, to the one or more TRPs of the cell, multiple instances of a first random access message based on the multiple beams, where each of the multiple instances of the first random access message include a preamble portion and a payload portion. In another aspect, a node receiving the multiple instances of the first random access message can determine multiple beams to use in transmitting messages in the random access procedure and can transmit with one or multiple TRPs, to the UE and in response to the first random access message, multiple instances of a second random access message based on the multiple beams.