Random Access Transmission Configuration for Beam Diversity
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in random access performance due to higher path loss and beam correspondence issues, leading to increased latency and resource underutilization, especially in systems with larger bandwidths and higher frequency bands.
Innovation Solution
The proposed solution involves a method where a base station receives and responds to multiple random access preambles from different beam directions, allowing for multiple random access opportunities per attempt, and configures transmission configurations to finer granularity than a system nominal subframe, enabling efficient resource utilization and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single random access preamble is sent in a single beam direction per random access attempt, then the system maintains simple access procedure, but the robustness of random access fails due to beam correspondence issues, user mobility, and signal blockage
Solution Approach 1:
The patent segments the random access procedure into multiple opportunities within a single attempt, allowing the UE to send multiple preambles in different beam directions. This segmentation increases robustness by providing alternative paths for successful access while maintaining manageable complexity through structured configuration.
Solution Approach 2:
The network configures multiple random access opportunities and beam directions in advance before the actual random access attempt. This preliminary configuration enables the UE to have pre-planned alternative access paths, improving robustness without requiring complex real-time decision-making during the access procedure.
2Productivity
If random access messages are carried in entire subframes over beam directions, then the transmission is simple to implement, but resource utilization becomes inefficient especially in systems with large bandwidths
Solution Approach 1:
The patent segments the subframe into smaller transmission time intervals (TTIs) for carrying random access messages. This segmentation allows more flexible and efficient resource allocation within the subframe, improving resource utilization by matching the message size and timing requirements more precisely rather than using the entire subframe.
Solution Approach 2:
The patent introduces dynamic transmission configuration where the network can flexibly adjust the TTI duration and resource allocation based on actual random access message size and system conditions. This dynamic approach optimizes resource utilization while adapting to varying bandwidths and traffic conditions.
3Productivity
If the transmission configuration is defined at system nominal subframe granularity, then the configuration is simple to manage, but the resource allocation efficiency decreases due to inability to match finer timing requirements
Solution Approach 1:
The patent segments the system nominal subframe into multiple smaller transmission time intervals (TTIs) that can be independently configured and allocated. This segmentation enables more precise matching of resource allocation to actual message requirements, improving efficiency while maintaining configuration manageability through hierarchical structure.
Solution Approach 2:
The patent applies different configuration granularities at different levels: coarse-grained configuration at the subframe level for overall management, and fine-grained configuration at the TTI level for specific resource allocation. This local quality approach optimizes both manageability and efficiency by applying appropriate granularity where needed.
Data Source
AI summary
Wireless communications systems and methods related to performing random access procedures. A base station (BS) receives, from a user equipment (UE), a plurality of random access preambles from a plurality of beam directions, wherein each of the plurality of random access preambles is received from a different beam direction, and wherein the plurality of random access preambles are associated with multiple random access opportunities of a random access attempt. The BS sends, in response to the plurality of random access preambles, a plurality of random access response (RAR) messages in the plurality of beam directions.