Asynchronous Multicast Synchronization for Mobile Terminals
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Solution Overview
Problem
Traditional mobile communication systems face increased resource overhead due to the need for individual synchronization of multiple mobile terminals with base stations, especially with the integration of machine-to-machine terminals, which results in a linear increase in timing messages and calculation effort.
Innovation Solution
The proposed method involves partitioning machine terminals into subsets based on timing and frequency offsets, allowing for asynchronous communication by using multicast messages to schedule transmission times and frequencies, thereby reducing the need for individual timing updates and minimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual synchronization of multiple mobile terminals with base stations is implemented, then communication reliability is improved, but resource overhead increases linearly
Solution Approach 1:
The patent merges the synchronization of multiple terminals by grouping them into subsets that share common timing characteristics. Instead of individually synchronizing each terminal, the base station synchronizes subsets of terminals simultaneously, reducing the number of separate synchronization operations required and thereby reducing resource overhead while maintaining communication reliability.
Solution Approach 2:
The patent segments the set of mobile terminals into multiple subsets based on their timing offsets. Each subset is then synchronized independently using dedicated timing update messages. This segmentation allows the base station to manage synchronization more efficiently by handling smaller groups rather than all terminals individually, reducing overall resource consumption.
2Measurement precision
If individual timing updates are provided to each terminal, then synchronization precision is improved, but calculation effort increases linearly
Solution Approach 1:
The patent combines multiple individual timing update operations into a single multicast timing update message that is transmitted to multiple terminals simultaneously. This merging approach maintains synchronization precision for all terminals while significantly reducing the calculation effort required by the base station, as it processes one consolidated message rather than multiple individual updates.
Solution Approach 2:
The patent creates a universal timing update message that serves multiple terminals within a subset simultaneously. This multi-functional approach allows a single message to perform the synchronization function for multiple terminals, reducing the calculation effort required while maintaining the precision needed for accurate timing across all served terminals.
3Adaptability or versatility
If machine-to-machine terminals are integrated into the system, then system versatility is improved, but control messages increase excessively
Solution Approach 1:
The patent merges machine-to-machine terminals with traditional mobile terminals into unified subsets that are synchronized using the same timing update mechanisms. This merging approach allows the system to handle diverse terminal types with a single set of procedures, improving versatility while avoiding the need for separate control message streams for different terminal categories.
Solution Approach 2:
The patent creates a universal synchronization mechanism that applies to all terminal types including machine-to-machine terminals. This multi-functional approach allows the base station to use the same timing update messages for both traditional and machine terminals, improving system versatility without increasing control message overhead.
Data Source
AI summary
A radio communication method and a corresponding system are described. Time frequency resources are divided into a grid of resources. For communicating with a plurality of non-synchronized terminals the timing offset of each terminal is measured and a joint message is asynchronously transmitted to a subset of terminals, wherein the subset comprises at least two terminals.