RAW Network Handover Tracking for Guaranteed QoS Mobility
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable and available handovers of wireless transmit/receive units (WTRUs) between network nodes, particularly in ensuring quality of service (QoS) parameters during and after handovers, and in managing identifiers and bicasting requirements.
Innovation Solution
A method and apparatus for a WTRU to determine imminent reliable and available wireless (RAW) handover, send information to a RAW network node about QoS parameters and identifiers, receive permission for handover, and perform the handover to a target RAW network node, while a network node tracks and supports QoS parameters for the flow between the WTRU and an external node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover preparation is performed in advance by the WTRU, then handover reliability and QoS guarantee are improved, but the complexity of handover management and information exchange between network nodes increases
Solution Approach 1:
The WTRU performs handover preparation in advance by determining imminent handover conditions and sending handover initiation information to the current network node before actual handover occurs. This allows the network to pre-establish tracking areas and subtracks, ensuring QoS is maintained during the transition without requiring complex real-time coordination.
2Reliability
If QoS parameters are strictly enforced during handover, then service quality is improved, but the overhead for tracking and managing QoS parameters increases
Solution Approach 1:
The patent applies local quality by establishing tracking areas and subtracks specific to each WTRU's handover path, rather than implementing global QoS tracking. Each tracking area manages QoS parameters locally for its specific WTRU flow, reducing the overall information overhead while maintaining strict QoS enforcement where needed.
3Reliability
If bicasting is implemented for handover redundancy, then handover availability is improved, but network resource consumption increases
Solution Approach 1:
The patent implements dynamic bicasting where the network node determines whether to establish bicasting paths based on real-time conditions. Bicasting is activated only when handover failure risk is detected and deactivates when conditions improve, providing handover redundancy when needed while minimizing network resource consumption during normal operation.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products enabling, supporting and/or improving terminal mobility in reliable and available wireless (RAW) networks are described. One method may include receiving, by a target RAW network node, a message to initiate a RAW handover of a WTRU from a current RAW network node that the WTRU is attached to. The message may include information including at least one of: an ID of the WTRU, an ID of the current RAW network node the WTRU is attached to, an ID of a RAW domain that the current RAW network node belongs to, and/or a description of QoS parameters required by a flow between the WTRU and an external node. The method may include determining, based at least on the information provided in the message, tracks and subtracks for supporting a QoS of the flow between the WTRU and the external node, and sending, to the current RAW network node, an acknowledgement message with an ID of the WTRU and/or description of the QoS parameters that can be granted to the flow.