Multi-Hop Wireless Preamble Synchronization Overhead Reduction
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Solution Overview
Problem
Current wireless communication networks, particularly those operating under the IEEE 802.16 standard, face challenges in efficiently supporting synchronization and neighbor node monitoring due to the overhead associated with transmitting preambles, which limits bandwidth and data throughput, especially in multi-hop networks.
Innovation Solution
A method and system where a first preamble is transmitted using a fixed repetition cycle for synchronization, and a second preamble is used in a different repetition cycle for neighbor monitoring, allowing for efficient frame synchronization and link quality assessment without increasing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate preambles are transmitted for synchronization and neighbor node monitoring, then synchronization accuracy and monitoring capability are improved, but overhead increases and bandwidth efficiency deteriorates
Solution Approach 1:
The patent combines synchronization and neighbor node monitoring functions into a single unified preamble structure. The downlink preamble is designed to serve dual purposes: enabling frame synchronization for relay nodes and providing neighbor node monitoring capability simultaneously, thereby eliminating the need for separate preambles and reducing overall overhead.
Solution Approach 2:
The downlink preamble is designed as a multi-functional signal that performs multiple tasks. It universally serves both synchronization requirements (providing timing reference and frame alignment) and neighbor node monitoring requirements (enabling relay nodes to detect and measure neighboring nodes), making a single structure fulfill multiple critical functions.
2Reliability
If preambles are transmitted in every frame for reliable synchronization, then synchronization reliability is improved, but bandwidth utilization deteriorates
Solution Approach 1:
The patent implements periodic transmission of the downlink preamble at specific intervals rather than in every frame. This periodic action maintains sufficient synchronization reliability by providing regular timing references while allowing data transmission in frames without preambles, thereby optimizing bandwidth utilization.
Solution Approach 2:
The downlink preamble is transmitted in advance before data transmission begins, establishing synchronization and enabling neighbor node detection beforehand. This preliminary action ensures that relay nodes are properly synchronized and can monitor neighbors before actual data communication occurs, maintaining reliability while separating overhead from data transmission.
3Adaptability or versatility
If relay nodes transmit preambles for monitoring, then neighbor node detection capability is improved, but processing overhead increases
Solution Approach 1:
The patent enables relay nodes to perform neighbor node monitoring by receiving and processing the downlink preamble transmitted by the base station. Instead of requiring relay nodes to actively transmit preambles for monitoring, the system allows them to passively receive and self-service their monitoring needs from the base station's downlink preamble, significantly reducing processing overhead.
Data Source
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AI summary
A wireless communication system and method for wireless communication in a multi-hop network. A first preamble is transmitted using a first repetition cycle. Monitoring for a second preamble is done in a second repetition cycle. The first repetition cycle is different than the second repetition cycle.