Wireless Device Mobility Between Networks Using Paging Identifiers
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Solution Overview
Problem
The complexity of mobility between different wireless communication networks, particularly when the context for a suspended connection is lost or becomes unavailable, complicates procedures and renders wireless devices unreachable during inactive states.
Innovation Solution
Implementing a method that allows wireless devices to be paged using a paging identifier assigned by the core network of another network and configuring a timer to limit the inactive state duration, enabling seamless mobility and connection resumption across networks like NR and LTE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the connection is suspended to preserve context for quick resumption, then reconnection speed is improved, but the device becomes unreachable when context is lost
Solution Approach 1:
The patent introduces a paging mechanism as an intermediary system that bridges the suspended connection state and network core. When context is lost during suspension, the paging system acts as a mediator to re-establish connectivity by notifying the device of available resources, thus maintaining reachability without compromising the speed benefits of suspension.
Solution Approach 2:
The patent implements preliminary actions by pre-configuring paging identifiers and timers during the suspension process. These pre-prepared elements enable rapid recovery when context is lost, as the device already has the necessary paging information and timing parameters to resume connection without full re-negotiation.
2Adaptability or versatility
If the device camps in another network during inactive state, then mobility flexibility is improved, but network management complexity increases
Solution Approach 1:
The patent makes the paging system universal by enabling it to operate across different network types (first and second wireless communication networks with different core networks). The same paging mechanism handles both intra-network and inter-network mobility scenarios, reducing the need for separate management procedures for each network configuration.
Solution Approach 2:
The patent uses paging identifiers as copies of the device's identity information that can be exchanged between networks. Instead of transferring full context, the system copies essential identifying information (paging identifier) that allows the target network to manage the device without replicating the entire connection state, thus simplifying cross-network management.
3Loss of energy
If the context is lost during suspension, then resource freeing is improved, but connection resumption becomes difficult
Solution Approach 1:
The patent implements feedback mechanisms where the network core provides feedback information (paging messages) to the suspended device. This feedback loop enables the device to detect when resources are available and initiate resumption, making the process intuitive and automated without requiring complex manual intervention or full context preservation.
Solution Approach 2:
The patent changes the state parameters of the connection from fully connected to suspended with paging identifier assigned. This parameter change allows the network to free resources while maintaining enough identification information to facilitate resumption. The timer parameter also changes to manage the suspension duration, enabling automatic transition to idle state after a predetermined time.
Data Source
AI summary
A wireless device suspends a connection with a first access network and enters an inactive state. While the connection with the first access network is suspended and the wireless device is in the inactive state, the wireless device camps in a specific area of a second wireless communication network that is included in a notification area within which the wireless device is allowed to move without notifying either the second wireless communication network or a first wireless communication network that includes the first access network. Upon camping in the specific area, the wireless device starts a timer. Responsive to expiry of the timer, the wireless device switches from the inactive state to an idle state and/or transmits to the second access network signaling indicating that the wireless device is in the specific area or that the wireless device requests a connection to the second access network.