LTE to eHRPD Handoff Interruption Reduction
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Solution Overview
Problem
Current handoff processes between LTE and eHRPD networks experience significant interruption gaps due to the time required for signaling and context establishment, particularly during non-optimized handoffs where partial context is not maintained, affecting real-time services like VoIP and video telephony.
Innovation Solution
The method involves attaching to a first network during data inactivity, creating a context, and maintaining a partial context to efficiently switch to a second network by transmitting a request to establish a connection using a signaling channel before establishing a traffic channel, thereby reducing the interruption gap by performing VSNCP context establishment procedures in parallel with traffic channel setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handoff processes are used between LTE and eHRPD networks, then network reliability is maintained, but handoff interruption time increases significantly
Solution Approach 1:
The patent applies preliminary action by establishing a partial VSNCP context on the eHRPD network before the actual handoff occurs. During data inactivity periods, the mobile device maintains a dormant connection with the eHRPD network, pre-configuring VSNCP parameters and context information. When handoff is needed, this pre-established context allows for rapid activation without full re-negotiation, significantly reducing handoff interruption time while maintaining service reliability.
2Speed
If partial context is maintained during handoff, then handoff speed is improved, but device complexity increases
Solution Approach 1:
The patent implements partial action by maintaining only a partial VSNCP context rather than a complete active connection. The mobile device keeps essential VSNCP parameters, security context, and network identification information in a dormant state on the eHRPD network, while full data transmission paths remain inactive. This partial context maintenance accelerates handoff execution while avoiding the complexity of maintaining fully active connections across multiple networks simultaneously.
3Measurement precision
If VSNCP context establishment is performed sequentially, then signaling accuracy is maintained, but handoff time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring VSNCP context parameters during periods of data inactivity. Essential VSNCP signaling information including protocol version, compression parameters, and network identifiers are prepared in advance and stored in the mobile device's context memory. When handoff is triggered, these pre-configured parameters are rapidly transmitted and activated, enabling parallel processing of context establishment and traffic channel setup, thereby reducing overall handoff time while preserving signaling accuracy.
Data Source
AI summary
Systems, methods and apparatus for non-optimized handoffs for wireless communication are provided. For example, the disclosure may be applied to enhance non-optimized handoff from a long-term evolution (LTE) network to an evolved high rate packet data (eHRPD) network. Systems, methods, and apparatus for reducing the interruption gap during handoffs from an LTE radio access network to an eHRPD network are also discussed. In one aspect, a method is provided for communicating information associated with a handoff of a wireless device from a source network to a target network. The method includes, during a period of data inactivity, attaching to a first network and creating a context therewith, the first network being a non-preferred network as compared to a second network. The method also include connecting to the second network based on the context created with the first network and while maintaining at least a partial context with the first network.