CSFB Priority Handling for E-RAB and RRC Connection Setup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The CSFB procedure in LTE mobile communication systems faces challenges in prioritizing resource allocation for E-RAB and RAB setup as packet bearers and establishing RRC connections, especially when resources are scarce or RRC functions are congested, leading to failures in handling prioritized calls and handovers.
Innovation Solution
A method that involves prioritizing resource allocation for E-RAB and RAB setup by including priority call information in requests, reserving resources for prioritized mobile stations, and aborting procedures when resources are insufficient, ensuring preferential treatment of RRC signals in the CSFB process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSFB procedure is used for prioritized mobile station, then circuit-switched communications can be performed, but resources cannot be preferentially allocated for E-RAB and RAB setup as packet bearers
Solution Approach 1:
The patent introduces a priority indicator parameter in the service request message to differentiate prioritized mobile stations. The radio base station uses this parameter to change resource allocation behavior, preferentially allocating resources for E-RAB and RAB setup when the priority indicator is present, thus resolving the contradiction between maintaining circuit-switched communications and improving resource allocation efficiency.
2Reliability
If CSFB procedure is used for prioritized mobile station, then circuit-switched communications can be performed, but RRC connection cannot be preferentially established when RRC function is congested
Solution Approach 1:
The patent uses the priority indicator parameter to trigger special RRC connection handling. When the radio base station detects a prioritized mobile station (indicated by the priority indicator), it preferentially processes RRC connection establishment requests even when the RRC function is congested, reducing connection establishment time for prioritized users while maintaining circuit-switched communication reliability.
3Quantity of substance
If resources are short for E-RAB setup, then resource constraints are maintained, but prioritized mobile station cannot be served
Solution Approach 1:
The patent applies local quality by treating prioritized mobile stations differently from regular users through the priority indicator mechanism. When resources are scarce, the radio base station preferentially allocates available resources to mobile stations with the priority indicator, ensuring that prioritized calls are served first. This local differentiation in resource allocation quality resolves the contradiction between maintaining overall resource constraints and ensuring reliable service for prioritized users.
Data Source
AI summary
A mobile communication method according to the present invention includes the steps of: transmitting an "Extended Service Request" from a mobile station UE in Idle mode to a mobility management node MME via a radio base station eNodeB; transmitting an "Initial UE Context Setup Request" from the mobile station UE to the radio base station eNodeB, the "Initial UE Context Setup Request containing priority call information; and preferentially allocating resources to the E-RAB for the mobile station UE by the radio base station eNodeB based on the priority call information contained in the received "Initial UE Context Setup Request."