Clustered Ad Hoc Link Scheduling with Hybrid NOMA and TDMA
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Solution Overview
Problem
Ad hoc networks face suboptimal throughput due to conventional TDMA schemes that do not account for simultaneous user transmissions, while NOMA techniques are inefficient without complex power management and may not guarantee minimum data rates.
Innovation Solution
A method combining TDMA and NOMA access techniques by partitioning communication links based on throughput criteria, using iterative algorithms and linear encoders/decoders to optimize network performance with minimal complexity and information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDMA access is used, then interference between communication links is eliminated, but network throughput is suboptimal
Solution Approach 1:
The set of communication links is segmented into two subsets: one subset uses TDMA access to guarantee interference-free communication, while the other subset uses NOMA access to maximize throughput. This segmentation allows the system to simultaneously achieve both interference elimination and high throughput for different links.
Solution Approach 2:
The system dynamically changes the access mode parameter for each communication link based on channel conditions, quality metrics, and throughput requirements. Links with favorable conditions can switch to NOMA for higher throughput, while links requiring reliability remain on TDMA.
2Productivity
If NOMA access is used, then network throughput is increased, but interference management complexity increases
Solution Approach 1:
The coordinator node acts as an intermediary that centralizes the complex interference management functions. It performs quality assessment, determines optimal access modes, and allocates resources for NOMA links. This centralization simplifies the overall system complexity by consolidating management functions in a single node rather than requiring distributed complexity across all nodes.
3Productivity
If NOMA access is used, then multiple users can transmit simultaneously, but minimum data rate guarantee is not provided
Solution Approach 1:
Communication links are segmented into two groups: those requiring minimum data rate guarantees are assigned TDMA access, while those prioritizing simultaneous transmission capability are assigned NOMA access. This segmentation ensures that reliability-critical links maintain guaranteed performance while throughput-critical links utilize NOMA's simultaneous transmission benefits.
4Productivity
If hybrid NOMA/TDMA access is implemented, then network throughput is optimized, but information exchange requirements increase
Solution Approach 1:
The coordinator node serves as an information exchange intermediary that collects quality metrics from all nodes, performs centralized optimization calculations, and distributes access mode assignments. This centralized information gathering and distribution minimizes the total information exchange required compared to distributed approaches, as all decision-making information converges at the coordinator.
Data Source
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AI summary
The invention relates to a method for determining a multiple access mode and scheduling for communication links in an ad hoc network comprising a plurality of nodes grouped into one or more clusters. It comprises: • a step of transmitting information relating to the quality of the communication links to a decision node; • a step of partitioning the communication links between those using NOMA-type multiple access and those using TDMA-type multiple access, based on a throughput criterion; • a third step of determining a temporal schedule for the communication links, respecting the calculated multiple access types; • a fourth step of transmitting the partitioning information and the temporal scheduling information to the nodes involved in the communication links. The invention also relates to a decision node implementing the method.