Grouped UE RRC Notifications for Access-Class Barring Relief
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Solution Overview
Problem
Miscommunications between different layers of a protocol stack in user equipment (UE) can cause the UE to be unaware that barring of an access class is alleviated, leading to unintended limitations in service provision.
Innovation Solution
The radio resource control (RRC) layer of the UE provides a barring message to an upper layer indicating that a group of access classes are barred, and upon alleviation, sends an alleviation message to allow the upper layer to attempt connections with these classes, thereby avoiding miscommunications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RRC layer sends individual alleviation messages for each access class, then the upper layer can be precisely informed of barring relief status, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent combines multiple access class barring alleviation indications into a single group barring message. When multiple access classes are barred, the RRC layer sends one group message indicating the group is barred, and later sends one group message indicating the group is alleviated, rather than sending individual messages for each access class. This reduces signaling overhead and processing complexity while maintaining accurate information transfer to the upper layer.
2Adaptability or versatility
If the UE attempts connections for all access classes after barring alleviation, then service availability improves, but unnecessary connection attempts increase power consumption
Solution Approach 1:
The patent implements a feedback mechanism where the RRC layer monitors the barring status of access classes and provides timely alleviation notifications to the upper layer. When the RRC layer determines that barred access classes are no longer barred, it sends an alleviation message to the upper layer, enabling the upper layer to resume connection attempts for the alleviated access classes. This feedback ensures the upper layer operates with accurate, up-to-date information, allowing it to intelligently attempt connections only when appropriate, thereby improving service availability while avoiding unnecessary connection attempts that would waste power.
Data Source
AI summary
This document describes techniques and devices for informing an upper layer of barring alleviation for multiple access classes. In some situations, a radio resource control (RRC) layer of a user equipment (UE) can provide to an upper layer of the UE a barring message that indicates at least two access classes are barred in response to receiving a rejection message from a random access network (RAN). Responsive to the RRC layer determining that the at least two access classes are no longer barred, the RRC layer can provide the upper layer an alleviation message that indicates barring of the least two access classes is alleviated. By informing the upper layer of multiple access classes using the alleviation message, miscommunications regarding barring alleviation of the access classes can be avoided between the RRC layer and the upper layer.