User Equipment Re-attachment After Service Reject Using RRC Timer
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Solution Overview
Problem
Substantial delays occur after a service reject is received by user equipment in wireless communications, particularly due to issues like inability to derive user equipment identity or implicit detachment, leading to race conditions and connection establishment delays.
Innovation Solution
Implementing a predetermined timer at the user equipment to determine whether to use a new or old radio resource control connection for re-attachment after a service reject, allowing the network sufficient time to release resources and avoid clashes, thereby reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network sends a service reject message to the user equipment, then the network can reject unwanted service requests, but substantial delays occur when the user equipment attempts to re-establish connections
Solution Approach 1:
The network performs preliminary actions by sending a connection release message to the base station immediately when a service reject is sent to the user equipment. This preliminary release of radio resources prevents the race condition that causes delays, allowing the user equipment to re-attach without waiting for resource cleanup while the network has already prepared for the re-attachment.
2Reliability
If the user equipment waits for network resource release before re-attaching, then resource conflicts are avoided, but connection establishment is delayed
Solution Approach 1:
The system implements feedback through the connection release message mechanism. The network provides feedback to the base station about the service reject decision, which then releases resources. This feedback loop ensures the base station knows when resources are available for re-attachment, eliminating the need for the user equipment to wait unnecessarily while preventing resource conflicts.
3Productivity
If the network releases radio resources immediately upon service reject, then re-attachment speed is improved, but resource conflicts may occur
Solution Approach 1:
The connection release message is sent as a preliminary action immediately when the service reject is transmitted. This ensures radio resources are released in advance of the user equipment's re-attachment attempt, allowing fast re-attachment while the network has already prepared the resources to avoid conflicts.
Data Source
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AI summary
Methods and apparatus, including computer program products, are provided for delaying a service request. In one aspect there is provided a method. The method may include receiving, at a user equipment, a message including a service rejection sent by a network; starting a timeout period in response to the received message including the service rejection; and waiting to send an attach request to the network until at least one of a radio resource control connection release is received from the network or the timeout period expires. Related apparatus, systems, methods, and articles are also described.