Dynamic Timing Control for Radio Uplink Synchronization
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Solution Overview
Problem
Current radio communication systems, particularly UMTS, face challenges in efficiently and flexibly controlling upward signal transmissions to ensure synchronous reception at base stations, with binary timing control commands struggling to adapt quickly to rapid path changes and multi-step commands increasing signaling load.
Innovation Solution
Implementing a method that dynamically switches from binary or ternary one-step control commands to multi-step control commands when a predetermined time offset threshold is exceeded, allowing for rapid synchronization and reducing signaling load through a synchronization procedure initiated by a randomly controlled access channel, and considering the current status and service type of the subscriber terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If binary timing control commands are used for controlling upward signal transmissions, then signaling load is reduced, but the system cannot adapt quickly to rapid path changes
Solution Approach 1:
The patent applies dynamics by making the timing control command format adaptable rather than fixed. The system dynamically switches between binary/ternary one-step commands and multi-step commands based on the determined time offset magnitude. When time offsets are small, compact binary commands are used to minimize signaling load; when time offsets exceed a threshold, the system transitions to multi-step commands that provide finer granularity and faster adaptation capability, thus resolving the contradiction between signaling efficiency and adaptation speed.
Solution Approach 2:
The patent changes the parameter of command resolution by offering multiple command formats with different precision levels. Binary timing control commands provide coarse adjustment with minimal signaling, while multi-step timing control commands provide fine-grained adjustment for rapid adaptation. The system selects the appropriate command format parameter based on the determined time offset, allowing optimization of both signaling load and adaptation speed under different conditions.
2Adaptability or versatility
If multi-step timing control commands are used for controlling upward signal transmissions, then adaptation to path changes is improved, but signaling load increases
Solution Approach 1:
The system dynamically adjusts the command format based on actual synchronization needs. Instead of continuously using multi-step commands, the system transitions to compact binary/ternary commands when time offsets are within acceptable ranges, reducing signaling load while maintaining adaptation capability when needed.
Solution Approach 2:
The patent applies partial action by using the more complex multi-step timing control commands only partially - specifically when time offsets exceed a predetermined threshold. For normal operating conditions with smaller time offsets, the system uses simpler binary commands, thus avoiding the excessive signaling load that would result from continuously employing multi-step commands while still providing the adaptation capability when required.
3Reliability
If a synchronization procedure is initiated by randomly controlled access channel, then synchronization is achieved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by performing timing alignment adjustments using binary/ternary commands and multi-step commands before initiating a full synchronization procedure via the randomly controlled access channel. This preliminary timing correction reduces the time offset to within acceptable ranges, allowing the subsequent synchronization procedure to complete faster and with higher reliability, thus mitigating the transmission delay penalty.
Data Source
AI summary
A method controls a time-based transmission of signals of a subscriber terminal for synchronous reception at a base station of a radio communication system. Upon detection that a determined time offset of received signals is equal to or greater than a predetermined threshold value, a change from one-step control commands to multi-step control commands for controlling the time-based transmission of the subscriber terminal is performed by the base station, or a synchronization procedure is initiated by means of a randomly chosen access channel by the subscriber terminal.