ITLinQ D2D Spectrum Sharing via ITIS User Classification
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in managing interference among wireless devices, as existing scheduling techniques fail to adequately define conflict graphs and determine sufficient interference levels, leading to suboptimal spectrum sharing and reduced network performance.
Innovation Solution
The introduction of information-theoretic independent sets (ITIS) and the information-theoretic link scheduling (ITLinQ) mechanism, which classifies users into subsets where interference is treated as noise, ensuring information-theoretically optimal communication by scheduling users based on signal-to-noise ratio and interference-to-noise ratio conditions, thereby achieving a higher fraction of the capacity region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If users are scheduled to transmit simultaneously in D2D communication, then spectrum utilization is improved, but interference between users increases
Solution Approach 1:
The patent segments users into information-theoretic independent sets (ITIS), where each set contains users who can simultaneously transmit without significant interference. This segmentation allows the system to maximize concurrent transmissions while maintaining acceptable interference levels, thus improving spectrum utilization without excessive interference.
Solution Approach 2:
The patent changes the scheduling parameter from traditional graph-based independent sets to information-theoretic independent sets defined by signal-to-interference-plus-noise ratio (SINR) conditions. Specifically, users are grouped based on whether their desired signal strength exceeds the sum of interference and noise, allowing optimal spectrum sharing based on actual channel conditions.
2Productivity
If interference management is relaxed to allow more simultaneous transmissions, then network capacity increases, but communication reliability deteriorates
Solution Approach 1:
The patent defines a precise parameter threshold for including users in the same ITIS: the desired channel strength must be at least the sum of the strongest interference and noise. This parameter-based approach ensures that communication reliability is maintained (by excluding users who would suffer from excessive interference) while maximizing network capacity (by including all users who meet the threshold).
Data Source
AI summary
A method for managing spectrum sharing in a wireless communication network includes identifying a set of users in the wireless communication network which shares a spectrum of communication, classifying the set of users into multiple subsets of users, and scheduling, within a given time slot, one subset of users among the multiple subsets of users to transmit and receive data at the same time so that the scheduled subset of users shares the spectrum of communication. The users in a subset are selected by comparing the desired channel strength with the sum of strengths of the strongest interference from that user and the strongest interference to that user, all values in dB scale.