RRC Connection Release Control for IMS and TAU Continuity
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Solution Overview
Problem
Existing RRC connection management mechanisms in wireless communication systems rely solely on data inactivity to trigger connection release, leading to inefficiencies and failures in various operational scenarios, such as missed IMS registrations and RRC connection failures during Tracking Area Updates, highlighting the need for enhanced connection management.
Innovation Solution
User equipment (UE) proactively monitors conditions beyond data inactivity, including network activity, pending data transfers, and service requirements, using timers and counters to dynamically decide whether to maintain or release the RRC connection, ensuring improved service quality and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RRC connection is released based solely on data inactivity, then power consumption is reduced, but service continuity and reliability deteriorate
Solution Approach 1:
The UE proactively checks multiple conditions (data buffer status, paging message status, IMS registration status, TAU status) before releasing the RRC connection. This preliminary verification ensures that the connection is only released when truly safe to do so, preventing premature releases that would disrupt service continuity while still enabling power savings when conditions permit.
Solution Approach 2:
The RRC connection release decision is made dynamic by continuously monitoring multiple conditions rather than relying on a static inactivity timer alone. The connection state adapts based on real-time assessment of data buffer status, network paging activity, IMS registration state, and TAU status, allowing the system to optimize between power consumption and service reliability adaptively.
2Reliability
If RRC connection is maintained in all scenarios, then service reliability is improved, but power consumption increases
Solution Approach 1:
Different conditions are evaluated with different weights and priorities. For example, IMS registration status and TAU status are critical conditions that must be satisfied before release, while data buffer status provides additional optimization opportunities. This localized quality assessment allows the system to maintain high reliability for critical services while enabling power savings in less critical scenarios.
Solution Approach 2:
The system changes the parameters used for connection management from a single inactivity timer to multiple condition parameters including data buffer status, paging message status, IMS registration status, and TAU status. This parameter transformation enables more nuanced control over the connection state, allowing the system to achieve both reliability and power efficiency.
3Measurement precision
If multiple conditions are monitored for RRC connection management, then connection management accuracy is improved, but device complexity increases
Solution Approach 1:
The UE leverages existing multi-functional monitoring mechanisms already present in the system (data buffer monitoring for uplink data, paging message monitoring for network notifications, IMS registration monitoring for voice services, TAU monitoring for mobility management) and integrates them into the RRC connection release decision. This approach achieves high management accuracy without adding significant complexity, as it reuses existing monitoring capabilities across multiple functions.
Data Source
AI summary
A user equipment device in a cellular network implements one or more mechanisms to manage Radio Resource Control (RRC) connection at the UE. These one or more mechanisms include the UE detecting at least one condition of a plurality of conditions associated with an RRC connection between the UE and the cellular network. The UE maintains the RRC connection in response to the detected at least one condition.