Striped Wireless Backhaul Timing Control
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Solution Overview
Problem
Existing wireless backhaul systems face challenges in achieving high data rates and long-distance connectivity, particularly in remote areas with limited spectrum bandwidth, where link aggregation techniques like striping often result in out-of-order packet delivery and increased delay due to heterogeneous and time-varying data rates across different frequency bands.
Innovation Solution
A striped wireless backhaul communication system utilizing a parallel processing architecture with timing controls to achieve work-conserving and in-sequence performance, where each band operates with a different data rate, and frames are transmitted with a constant slot length multiplied by the data rate, ensuring efficient scheduling and minimizing scheduling conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is striped across multiple wireless frequency bands, then transmission capacity and throughput are increased, but packet delivery order is lost and delay increases
Solution Approach 1:
The transmitter pre-calculates and applies compensation delays to packets before transmission based on predicted reception times. This preliminary timing adjustment ensures that packets from different frequency bands arrive at the receiver in the correct sequence without requiring reordering buffers or sequence numbering, thus maintaining low delay while achieving high throughput through multi-band striping
2Reliability
If sequence numbering and reordering buffers are used to maintain packet order, then packet delivery sequence is preserved, but system complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the need for complex reordering buffers and sequence numbering mechanisms by using a different approach: timing-based packet scheduling at the transmitter that compensates for frequency-dependent propagation delays. This removes the harmful complexity from the system while preserving reliable in-order packet delivery
Solution Approach 2:
The invention introduces a timing compensation mechanism as an intermediary between the multi-band transmission system and the packet delivery process. By adjusting packet transmission times based on predicted reception characteristics of different frequency bands, the system achieves ordered delivery without requiring intermediate buffering or reordering operations at the receiver
3Productivity
If all links are fully utilized for work-conserving operation, then throughput is maximized, but maintaining in-sequence delivery becomes difficult with heterogeneous data rates
Solution Approach 1:
The invention implements dynamic packet scheduling that adapts to heterogeneous and time-varying data rates across different frequency bands. The transmitter continuously calculates optimal transmission timing for each packet based on current channel conditions and predicted reception times, allowing full utilization of all bands while maintaining in-sequence delivery through real-time timing adjustments rather than static allocation
Data Source
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AI summary
Disclosed is a method of transmitting data over a plurality of wireless frequency bands between a transmitter and a receiver during one of a plurality of rounds, the method comprising: computing a target spacing in time between a start time of transmission in a first band and a start time of transmission in a second band dependent on a first data rate in the one round and in the first band; commencing transmitting, by the transmitter, a first frame of data over the first band at the first data rate; waiting for the computed target spacing to elapse, and then commencing transmitting, by the transmitter, a second frame of data over the second hand at a second data rate.