Mobile Station Pre-Selected Reconnection Timing
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Solution Overview
Problem
In mobile communication systems, the time required for re-connection after signal quality deterioration is prolonged when multiple base stations are searched, leading to potential instantaneous interruptions of communication.
Innovation Solution
A mobile communication system with a mobile station apparatus that includes a delay difference detecting unit to calculate transmission timing for a pre-selected re-connection destination base station, allowing for instantaneous switching without band searching or random-access processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station apparatus performs band searching and measures signal quality of multiple base station apparatuses to select a re-connection destination, then the reliability of re-connection is improved, but the re-connection time is prolonged
Solution Approach 1:
The mobile station apparatus performs band searching and signal quality measurement in advance before disconnection occurs, storing the results as re-connection information. When disconnection occurs, the apparatus can immediately re-connect to the pre-selected base station without performing the search and measurement steps again, thus resolving the contradiction between re-connection reliability and re-connection time
Solution Approach 2:
The invention extracts the time-consuming band searching and signal quality measurement steps from the re-connection process by performing them in advance. The extracted re-connection information (including selected base station identity and transmission timing) is stored and reused during actual re-connection, eliminating the need to repeat these steps and thereby reducing re-connection time while maintaining reliability
2Reliability
If the mobile station apparatus performs random-access processing to establish synchronization with the re-connection destination base station, then the communication reliability is improved, but the re-connection time is further prolonged
Solution Approach 1:
The mobile station apparatus calculates and determines the transmission timing in advance before disconnection occurs, storing it as re-connection information. Upon disconnection, the apparatus uses this pre-calculated timing to immediately transmit data to the re-connection destination base station without performing random-access processing, thus maintaining communication reliability while significantly reducing re-connection time
3Reliability
If the mobile station apparatus performs band searching and random-access processing, then the re-connection reliability is ensured, but instantaneous communication interruptions occur
Solution Approach 1:
The invention performs band searching, signal quality measurement, base station selection, and transmission timing calculation in advance before disconnection occurs. By storing this re-connection information and using it immediately upon disconnection, the system ensures re-connection reliability while avoiding the time-consuming random-access processing that causes communication interruptions, thus maintaining communication continuity
Data Source
AI summary
It is possible to complete a re-connection in a short time and prevent instantaneous interruption of communication by including a plurality of base station apparatuses and a mobile station apparatus; the mobile station apparatus includes: a delay difference detecting unit that detects a difference in reception timing between a signal from the base station apparatus with which the mobile station apparatus currently communicates and a signal from the base station apparatus that is a re-connection destination candidate; a transmission timing calculating unit that calculates, based on the difference in reception timing, a transmission timing to the base station apparatus that is the re-connection destination candidate; and a re-connection processing unit that, having detected a disconnection of the communication with the base station apparatus with which the mobile station apparatus currently communicates, uses the transmission timing to start a communication with the base station apparatus that is the re-connection destination candidate.