Radio Access Network Slot Permutation for Interference Management
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Solution Overview
Problem
Wireless communication networks face interference and congestion due to increased demand for mobile broadband access, particularly in scenarios where multiple radio access networks (RANs) share the same frequency, leading to degraded performance and CSG issues in small cell deployments.
Innovation Solution
A method and apparatus for determining and selecting transmission slot assignments across multiple RANs on the same frequency, using permutations and indices to manage channel access, and re-selecting reserved slots in case of excessive failed transmissions to alleviate interference and ensure fair channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple RANs share the same frequency to increase network capacity, then network capacity and coverage are improved, but interference and congestion increase leading to degraded performance
Solution Approach 1:
The transmission frame is segmented into multiple transmission slots with different assignments. Each RAN is assigned specific slots within a frame structure, dividing the shared frequency resource into time-separated segments. This segmentation allows multiple RANs to operate on the same frequency simultaneously while reducing interference through temporal separation.
Solution Approach 2:
The transmission slot assignments follow a periodic frame structure where slot allocations repeat in a predetermined pattern. This periodic action enables predictable interference management and allows receiving devices to anticipate and filter out interference from other RANs based on known transmission patterns.
2Productivity
If transmission slots are shared among multiple RANs to improve resource utilization, then spectrum efficiency is improved, but channel access fairness deteriorates
Solution Approach 1:
Transmission slot assignments are predetermined and configured in advance for each RAN within the frame structure. This preliminary action establishes fair access rules before transmissions occur, ensuring that each RAN has pre-allocated opportunities to transmit without having to compete dynamically, thereby maintaining channel access fairness while achieving high spectrum efficiency.
Solution Approach 2:
The system changes the time-domain parameters of transmission slots by assigning different slot positions, durations, and patterns to different RANs. This parameter differentiation allows multiple RANs to share the frequency resource efficiently while maintaining fairness through structured temporal separation rather than random access.
3Adaptability or versatility
If dynamic slot assignment is used to adapt to varying traffic conditions, then network adaptability is improved, but system complexity increases
Solution Approach 1:
The transmission slot assignment structure incorporates dynamic elements where slot configurations can be adjusted based on traffic conditions while maintaining an overall periodic framework. This allows the system to adapt to varying demands without requiring completely dynamic reconfiguration, balancing adaptability with manageable complexity through semi-static patterns.
Data Source
AI summary
Management of shared transmission resources is disclosed for multiple radio access networks (RANs) sharing access to a finite number of transmission slots. Multiple permutations of slot assignments are configured in which each competing network is assigned a specific slot in each permutation. The sequence of permutations provides a fair distribution of spectrum access by the competing networks, such that in each permutation of the permutation sequence, networks assigned to lower priority slots may be assigned to higher priority slots in later permutations.