TDMA Transmission Scheduling via Propagation Delay Minimization
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Solution Overview
Problem
Time division multiple access (TDMA) networks face inefficiencies due to guard time requirements, which are challenging to minimize, especially in mesh networks with complex propagation delays and varied transmission types, leading to potential collisions and reduced network capacity.
Innovation Solution
A method to schedule transmissions in TDMA networks by determining the location of each transmitter, calculating the distance between pairs, and ordering them to minimize the sum of distances, thereby setting guard time equal to or greater than the propagation delay between successive pairs, eliminating the need for destination-specific calculations and handling various transmission types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard time is increased to accommodate propagation delay in mesh networks, then transmission reliability is improved, but network efficiency deteriorates due to lost channel capacity
Solution Approach 1:
The patent dynamically adjusts the guard time parameter based on the actual propagation delay between transmitter pairs. By calculating the specific distance and propagation characteristics for each transmitter pair, the system sets the minimum necessary guard time rather than using a fixed conservative value, thereby reducing lost channel capacity while maintaining transmission reliability.
Solution Approach 2:
The system transitions from static guard time allocation to dynamic guard time adjustment. The scheduler continuously determines transmitter locations, calculates propagation delays, and adapts guard time values accordingly. This dynamic approach allows the network to optimize channel capacity utilization while accommodating varying propagation conditions in mesh topology.
2Measurement precision
If destination-specific guard time calculations are implemented, then transmission accuracy is improved, but device complexity increases due to complex source and destination information handling
Solution Approach 1:
Each transmitter independently determines its location and calculates its propagation delay to other transmitters. The system uses self-organizing principles where transmitters autonomously gather location information and compute their own timing parameters, eliminating the need for complex centralized destination-specific calculations while maintaining transmission accuracy.
Solution Approach 2:
The complex problem of network-wide timing coordination is segmented into individual transmitter-level calculations. Each transmitter independently determines its location, calculates distances to other transmitters, and computes propagation delays separately. This segmentation simplifies the overall scheduling complexity while maintaining precise transmission timing.
3Productivity
If transmission order is optimized to minimize guard time, then network throughput is improved, but the risk of negative guard times increases which can cause collisions
Solution Approach 1:
The system implements a feedback mechanism where the scheduler continuously monitors transmitter locations, propagation delays, and guard time allocations. By calculating the actual propagation delay for each transmitter pair and using this feedback to adjust guard time values, the system ensures that optimized transmission ordering does not result in negative guard times, thereby preventing collisions while maintaining high throughput.
Solution Approach 2:
The scheduler performs preliminary calculations of transmitter locations and propagation delays before assigning transmission orders. By pre-determining the minimum necessary guard time for each transmitter pair based on their spatial relationships, the system optimizes transmission sequencing to minimize total guard time while ensuring that guard times remain positive and collisions are avoided.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces guard time, enhancing network efficiency by minimizing collisions and accommodating point-to-point, multicast, and broadcast transmissions, while avoiding negative guard times, thus improving throughput and latency.
Implementation Method 1
Propagation delay results because communications signals move at a finite velocity. For example, radio waves move at the speed of light.
Data Source
AI summary
A technique for scheduling transmissions for a plurality of transmitters in a TDMA network is described. The technique includes assigning guard time between each pair of successive transmitters, where the guard time is related to the propagation delay between the pair of successive transmitters. Total guard time is minimized by selecting an order of transmission for the plurality of transmitters to minimize the total guard time.