Mobile Station Synchronization Error Recovery via Random Access Channel
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Solution Overview
Problem
In mobile communication systems, downlink synchronization errors lead to inefficient radio resource utilization and communication quality degradation, as existing methods fail to promptly recover synchronization and manage errors effectively between mobile station devices and base stations.
Innovation Solution
A mobile communication system with a mobile station device and base station device that includes a downlink synchronization error detecting portion, a synchronization monitoring portion, and a notifying portion to transmit error information via a random access channel, and an adaptive control portion in the base station to adjust modulation and power based on received error information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the mobile station device stops uplink data transmission when downlink synchronization loss is detected, then radio resource waste is reduced, but communication quality and data transfer efficiency deteriorate due to inability to perform closed loop control and error notification
Solution Approach 1:
The patent segments the control information into two parts: synchronization status information (sent via random access channel) and normal control information (sent via uplink shared channel). This segmentation allows the system to maintain communication quality by notifying the base station of synchronization loss without requiring complete cessation of uplink data transmission, thereby resolving the contradiction between reducing radio resource waste and maintaining communication quality.
Solution Approach 2:
The patent introduces the random access channel as an intermediary mechanism for transmitting synchronization status information. This intermediary allows the mobile station to notify the base station of synchronization loss independently from the uplink shared channel, enabling the base station to perform appropriate error handling while maintaining normal data transmission, thus resolving the contradiction between stopping uplink data and maintaining communication quality.
2Measurement precision
If the mobile station device continuously monitors downlink synchronization, then synchronization accuracy is improved, but system complexity and processing overhead increase
Solution Approach 1:
The patent makes the random access channel serve multiple functions: it is used for both normal random access procedures and for transmitting synchronization status information. This multi-functionality allows the system to achieve high synchronization accuracy without adding dedicated monitoring infrastructure, thereby reducing system complexity while maintaining measurement precision.
Solution Approach 2:
The mobile station device uses its existing random access channel transmission capability to simultaneously convey synchronization status information without requiring additional dedicated monitoring hardware or complex processing systems. The system leverages existing resources to achieve high synchronization accuracy, avoiding increased device complexity.
3Reliability
If the base station performs adaptive control based on synchronization status, then communication quality during synchronization loss is improved, but control system complexity increases
Solution Approach 1:
The patent applies adaptive control locally only when synchronization loss is detected, rather than continuously adjusting all transmission parameters. The base station modifies modulation and power settings specifically for affected users during synchronization loss periods, which improves communication quality during these critical moments without requiring complex continuous adaptive control systems.
Solution Approach 2:
The patent changes physical transmission parameters (modulation scheme and power level) based on synchronization status. By adjusting these parameters adaptively when synchronization loss occurs, the system improves communication quality during synchronization loss without implementing complex control algorithms, as parameter changes can be executed directly by the existing transmission system.
Data Source
AI summary
A mobile station device that communicates with a base station device, including: a downlink synchronization error detecting portion that detects the occurrence of a downlink synchronization error from the measurement result of a transmission signal of the base station device; a synchronization monitoring portion that sets information showing the occurrence of a downlink synchronization error into a random access channel based on the downlink synchronization state or both the downlink and uplink synchronization states of the mobile station device; and a downlink synchronization error notifying portion that transmits the random access channel to the base station device.