IOPS Extended Wait Time Field in RRC Release Messages
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting isolated E-UTRAN operations for public safety and providing effective notification of IOPS status to both public safety and commercial user equipment, especially during network outages or limited backhaul capabilities.
Innovation Solution
The method involves configuring a radio resource control (RRC) connection release message with an IOPS extended wait time field, allowing User Equipment (UE) to delay access procedures until further announcement, and enabling eNodeB to determine whether to continue or disconnect RRC connections based on user type and IOPS status, using System Information Blocks or paging messages for status notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network disconnects commercial UEs during IOPS events, then public safety service reliability is improved, but commercial user service continuity deteriorates
Solution Approach 1:
The patent applies local quality by implementing different access control policies for different user types within the same network. Public safety UEs are granted priority access and maintained connections during IOPS events, while commercial UEs are disconnected. This differential treatment based on user type resolves the contradiction by locally optimizing service reliability for public safety users without uniformly affecting all users.
Solution Approach 2:
The patent segments the user base into distinct categories (public safety UEs and commercial UEs) with different service level agreements. By segmenting users and applying separate access control rules to each segment, the system can maintain public safety services during IOPS events while managing commercial user disconnections, thus resolving the contradiction between public safety reliability and commercial service continuity.
2Stability of the object's composition
If the UE delays access procedures during IOPS, then network stability is improved, but access response time deteriorates
Solution Approach 1:
The patent implements preliminary action by having UEs perform access procedures before IOPS events occur, or by maintaining RRC connected state in advance. The extended wait time field and further announcement mechanism allow UEs to prepare and delay access procedures proactively, reducing the need for rapid re-access during critical IOPS periods, thus prioritizing network stability over immediate access response time.
3Loss of information
If the network provides IOPS status notification to all UEs, then information completeness is improved, but signaling overhead deteriorates
Solution Approach 1:
The patent applies universality by using the existing RRC connection release message and system information blocks for multiple purposes: normal connection management and IOPS status notification. By embedding the IOPS extended wait time field and further announcement indicator within existing message structures, the system provides complete IOPS status information to all UEs without requiring separate dedicated signaling channels, thus minimizing additional signaling overhead.
4Speed
If the UE performs access procedure immediately, then access speed is improved, but network congestion worsens
Solution Approach 1:
The patent implements periodic action by introducing structured access delays with specific time intervals (extended wait time fields) and periodic status updates (further announcement indicators). Instead of immediate continuous access attempts, UEs are directed to wait for specified periods or until further announcements, which spreads access attempts over time and reduces peak network congestion while maintaining controlled access speed through the periodic retry mechanism.
Data Source
AI summary
The present invention relates to a method and apparatus for supporting an IOPS and notifying the IOPS status. In one aspect of the present invention, a method for supporting an Isolated E-UTRAN Operations for Public Safety (IOPS) in a wireless access system, the method performed by a User Equipment (UE) in a RRC connection mode and comprises steps of receiving a radio resource control (RRC) connection release message including a release cause field and an IOPS extended wait time field for restricting an initial access procedure; and releasing the RRC connection mode when the release cause field indicating an IOPS situation has been occurred, wherein the IOPS extended wait time field is configured to an Extended Wait Time (EWT) field indicating a time duration restricting the initial access procedure or to a Further Announcement field indicating the initial access procedure is restricted until a further announcement is received.