Mobile Station Handover Control for Simultaneous Voice and Data
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Solution Overview
Problem
Current LTE systems face handover failures during data calls when a mobile station moves out of an LTE cell area while using both data and voice services, as the serving base station may incorrectly determine a different legacy base station for handover, leading to service disruptions.
Innovation Solution
A method and apparatus for a mobile station supporting Radio Access Technology (RAT) that determines and transmits a measurement report message indicating neighboring base stations of voice call connections, allowing for a controlled handover to a base station of voice call connection during Simultaneous Voice and Data mode, ensuring a successful handover by prioritizing active base stations for data calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the serving base station determines handover target base station based on measurement report message from mobile station, then the handover process is simple and fast, but the handover may fail when the determined target base station is different from the voice call connection base station
Solution Approach 1:
The mobile station performs preliminary actions by identifying and prioritizing the voice call connection base station before handover occurs. The measurement report message is pre-configured to indicate this base station as the preferred target, ensuring that when handover is triggered, the correct target is already designated, preventing handover failure while maintaining the speed of automated base station determination
Solution Approach 2:
The measurement report message provides feedback information about the voice call connection base station to the serving base station. This feedback mechanism ensures that the serving base station receives accurate information about which base station should be the handover target, allowing it to make informed decisions that maintain both handover speed and success rate
2Measurement precision
If the mobile station transmits measurement report message including neighboring base station preference information, then the handover accuracy is improved, but the message complexity and information processing load increase
Solution Approach 1:
The measurement report message includes preference information specifically for the voice call connection base station rather than all neighboring base stations. This localized approach provides the necessary handover accuracy by highlighting the critical base station while avoiding the complexity of processing information about all possible targets, thus resolving the contradiction between precision and complexity
Data Source
AI summary
A method and apparatus supports Inter-Radio Access Technology (IRAT) Packet Switch (PS) handover during a simultaneous voice and data (SVD) mode in a mobile station that supports a Radio Access Technology (RAT). The method includes determining a state in which a data call is connected through a first system and a voice call is connected through a second system. The MS determines whether handover to the second system should be performed for the data call. A measurement report message that indicates a set of active base stations (BSs) of voice call connection in the second system is generated. And the measurement report message is transmitted to a serving BS of the data call connection in the first system.