Random Access Response Prioritization for Reduced Access Delay
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Solution Overview
Problem
Current Random Access Response (RAR) protocols do not provide an explicit solution for prioritizing preamble sequences when multiple User Equipments (UEs) initiate random access simultaneously, leading to contention and increased access delay.
Innovation Solution
A method and device that allocate RAR resources according to a preset order, prioritizing non-contention-based random access when it exists, and sequentially allocating to contention-based random access when it does not, ensuring different access types are responded to with varying priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station responds to multiple preamble sequences detected in the same TTI, then more UEs can be served simultaneously, but when the number of RARs that can be carried in MSG2 is less than the number of detected preamble sequences, the base station cannot respond to all UEs, causing some UEs to experience increased access delay
Solution Approach 1:
The patent changes the parameter of RAR resource allocation by introducing priority-based allocation mechanisms. Different RAR resources are allocated based on preamble sequence priorities, allowing the base station to serve multiple UEs simultaneously while ensuring critical UEs receive timely responses, thus resolving the contradiction between serving more UEs and maintaining low access delay.
2Ease of operation
If the base station allocates RAR resources equally to all detected preamble sequences, then fairness is maintained, but when RAR resources are limited, this equal allocation cannot prioritize critical access types, reducing overall system efficiency
Solution Approach 1:
The patent applies local quality by differentiating RAR resource allocation based on preamble sequence types. Different priority levels are assigned to different access scenarios (e.g., random access preamble vs. dedicated preamble), allowing the system to maintain fairness while prioritizing critical access types, thus improving overall system efficiency without completely sacrificing equity.
3Adaptability or versatility
If the base station uses contention-based random access resources, then more UEs can initiate access, but when multiple UEs select the same random access resource simultaneously, contention occurs, causing some UEs to reinitiate the access process and increasing access delay
Solution Approach 1:
The patent segments the random access preamble sequences into different priority categories. By dividing preamble sequences into contention-based and non-contention-based types with different priorities, the system allows more UEs to initiate access simultaneously while reducing contention for critical UEs through dedicated preambles, thus resolving the contradiction between access capacity and access delay.
Data Source
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AI summary
Disclosed is a Random Access Response (RAR) method, including: preamble sequences are retrieved on a PRACH, preamble sequences matching a preset range are acquired; allocated non-contention-based random access preamble sequences are compared with the preamble sequences matching the preset range, and it is determined whether there is a non-contention-based random access preamble sequence in the preamble sequences matching the preset range; and when it is determined that the non-contention-based random access preamble sequence exists, an RAR resource is allocated to a non-contention-based random access corresponding to the non-contention-based random access preamble sequence. Further disclosed is an RAR device. The disclosure achieves a beneficial effect that a base station responds at different priorities according to different access types when multiple pieces of User Equipment (UE) initiate the random access simultaneously, thereby improving the resource utilization and the whole system performance, and reducing a delay in the non-contention-based random access.