Multi-mode Device Handover Resource Optimization
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Solution Overview
Problem
Inter-technology handovers in dual-technology wireless networks experience significant latency delays and potential packet loss due to the time-consuming initial network entry procedures when handing over from a serving network to a target network with different wireless technologies, especially for Quality of Service (QoS) sensitive applications.
Innovation Solution
A method where multi-mode mobile devices initiate network entry and session establishment at the target network before an inter-technology handover is necessary, allowing seamless session continuity by pre-establishing a packet session at the target network while continuing to receive services from the serving network, thereby minimizing latency and resource allocation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If initial network entry procedures are completed at the target network before handover, then session continuity is improved and latency is reduced, but network resources are consumed and resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by initiating network entry procedures at the target network before the actual handover occurs. The mobile device performs authentication, authorization, and packet session registration with the target network while still connected to the serving network, so that when handover is triggered, the session can be immediately activated without delays.
2Reliability
If network entry procedures are completed before handover, then session continuity for QoS sensitive services is improved, but resource allocation complexity at the target network increases
Solution Approach 1:
The patent performs authentication, authorization, and packet session registration procedures in advance at the target network before handover is actually needed. This preliminary setup ensures that when handover occurs, QoS sensitive services can continue without interruption because the session framework is already in place.
Solution Approach 2:
The patent implements dynamic resource allocation where the mobile device maintains active packet sessions at both the serving network and target network simultaneously during the pre-handover phase. Resources are dynamically managed based on whether handover has actually occurred, allowing the system to adapt resource allocation to actual needs rather than permanently reserving resources.
3Ease of operation
If multi-mode mobile devices maintain active packet sessions at both serving and target networks simultaneously, then seamless handover is achieved, but energy consumption increases
Solution Approach 1:
The patent employs dynamic session management where the mobile device maintains active packet sessions at both serving and target networks only when necessary for handover preparation. The system dynamically switches between single-active-session and dual-active-session modes based on handover state, reducing energy consumption compared to permanently maintaining dual sessions.
Solution Approach 2:
The patent extracts and separates the session establishment function from the actual data transmission function. The mobile device establishes packet sessions at both networks for handover preparation, but only actively uses one network for data transmission at a time, reducing the energy required to maintain both sessions fully active simultaneously.
Data Source
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AI summary
A method is described that is for handing over a multi-mode mobile device from a first network technology to a second network technology. The method includes initiating by the multi-mode mobile device a first packet session in a first wireless network in an area of multi-technology wireless coverage and detecting by a multi-mode mobile device a second wireless network supporting a different access network technology than the first wireless network. The method also includes determining a Quality of Service requirement for services supported by the session, and completing initial network entry and session establishment procedures by the multi-mode mobile device for a second session in the second wireless network when the first session includes at least one of a QoS sensitive service and real time service by the first wireless network and mobile device, and not completing initial network entry and session establishment procedures by the multi-mode mobile device when no QoS sensitive service and real time services are supported by the mobile device and first wireless network.