5G Random Access Delay Reduction via Reason-Value Feedback
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Solution Overview
Problem
The contention-based random access procedure in existing communication technologies leads to long access delays for user equipment (UE) that cannot successfully access a base station, particularly in 5G networks requiring low latency for ultra-reliable and low-latency communication scenarios.
Innovation Solution
A method and device for shortening access delay by allowing user equipment to receive a message from the base station indicating the reason for access refusal, which includes neighboring base station information, and determining access priority based on service type and network status, enabling the UE to select a more suitable base station for re-access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the base station refuses access without providing reason information, then the access control is simple, but the user equipment experiences long access delay due to repeated random access attempts
Solution Approach 1:
The base station performs preliminary evaluation of access requests by determining service type from message 3 and assessing network status before sending message 4. This preliminary action allows the base station to provide reasoned access refusal with neighboring base station information, enabling UE to make informed reaccess decisions and avoid repeated failed attempts, thereby reducing access delay without significantly increasing message complexity
Solution Approach 2:
The patent implements feedback by including reason values in message 4 that explain why access was refused. This feedback mechanism provides UE with information about network status and alternative base stations, allowing UE to adjust its access strategy and select appropriate target base stations, thus reducing unnecessary repeated access attempts and lowering access delay
2Reliability
If the base station allows all access requests, then the access process is fast, but the network status and service quality cannot be guaranteed
Solution Approach 1:
The patent applies local quality by differentiating access treatment based on service type. URLLC services receive high priority with preferential access permission, while other services receive low priority. This differentiated quality control ensures reliable service delivery for critical applications while managing network resources efficiently, and the provision of reason values in message 4 helps reduce access delay for high-priority services
Solution Approach 2:
The base station changes the parameter of access priority based on service type determination. By parsing message 3 to identify service type and comparing it against network status, the base station dynamically adjusts access permission parameters, granting high priority to URLLC services and low priority to others. This parameter change mechanism ensures service quality while the inclusion of reason information in message 4 reduces access delay
3Ease of operation
If the user equipment repeatedly accesses the same base station after rejection, then the access strategy is simple, but the access delay increases significantly
Solution Approach 1:
The patent uses feedback by providing reason values in message 4 that explain access refusal. This feedback enables UE to understand why access was rejected and identifies alternative target base stations, allowing UE to modify its access strategy without complex manual configuration. The feedback mechanism reduces access delay by preventing repeated futile attempts at the same base station while maintaining ease of operation through automated UE decision-making
Solution Approach 2:
The UE performs self-service by autonomously determining the target base station based on reason values received in message 4. The UE automatically parses the reason value, identifies alternative base stations, and initiates random access to the selected target base station without requiring network operator intervention or complex external control. This self-service capability reduces access delay while keeping the access strategy simple from the user perspective
Data Source
AI summary
The present disclosure relates to a method, device, user equipment and base station for shortening access delay. The method can include receiving a message 3 of a random access procedure sent by a user equipment, and sending a message 4 of the random access procedure to the user equipment in response to determining to refuse access of the user equipment. The message 4 can include a reason value as to why the base station has refused the access.