Random Access Response Segmentation for Wireless Collision Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in random access procedures, particularly in processing and transmitting random access responses, which consume radio resources and can lead to collisions among user equipment (UEs) when accessing the system.
Innovation Solution
The proposed solution involves a UE transmitting a random access preamble and receiving a response comprising a first part with a list of RA preamble IDs and a second part with individual RA responses, processed using a MAC protocol data unit (PDU) with a Random Access Radio Network Temporary Identifier (RA-RNTI), allowing efficient identification and processing of responses, thereby optimizing resource usage and reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional random access response structure is used, then the response can be transmitted, but radio resources are consumed inefficiently and collisions occur among UEs
Solution Approach 1:
The random access response is segmented into two distinct parts: a first part containing a list of RA preamble IDs, and a second part containing individual RA responses. This segmentation allows UEs to efficiently process only relevant information by first checking the preamble ID list, thereby reducing unnecessary processing and optimizing radio resource utilization.
2Reliability
If individual RA responses are sent for each preamble, then complete response information is provided, but processing complexity and resource consumption increase
Solution Approach 1:
The first part of the response is prepared in advance, containing a list of all RA preamble IDs that have responses. UEs can perform preliminary checking against this list before processing individual responses, which simplifies the overall processing complexity while ensuring complete response information is provided for all valid preambles.
3Adaptability or versatility
If random access responses are transmitted without optimized structure, then all UEs can receive responses, but collisions occur among UEs accessing the system
Solution Approach 1:
The response structure provides different information densities at different locations: the first part contains a comprehensive list of preamble IDs for all responded preambles, while the second part contains detailed individual responses. This local quality differentiation allows UEs to quickly identify their responses and reduces collision probability by enabling more efficient random access procedures.
Data Source
AI summary
Techniques for supporting random access by user equipments (UEs) in a wireless communication system are described. In one design, a UE transmits a random access (RA) preamble for random access. The UE thereafter receives a random access response composed of a first part and a second part. The first part includes a list of N RA preamble IDs for N RA preambles being responded to by the random access response, where N≧1. The second part includes N individual RA responses for the N RA preambles being responded to. The UE processes the first part to detect for an RA preamble ID of the RA preamble transmitted by the UE. If this RA preamble ID is not detected, then the UE skips the second part. Otherwise, the UE processes the second part to obtain an individual RA response for the transmitted RA preamble.