Boundary Cell TDD Slot Pattern Coordination
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Solution Overview
Problem
Onsite cells operating near or within macrocells face interference issues due to differing TDD slot patterns, leading to suboptimal performance with increased latency, decreased throughput, and inefficient resource usage when they operate with the same slot pattern to avoid collisions.
Innovation Solution
Implementing a boundary cell with a TDD slot pattern that minimizes interference between onsite and macrocells by scheduling communications to avoid overlapping uplink and downlink slots, allowing onsite cells to use an uplink-centric pattern and macrocells to use a downlink-centric pattern, while the boundary cell adjusts its pattern to prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If onsite cells operate with the same TDD slot pattern as macrocells to avoid collisions, then interference between cells is reduced, but latency increases and throughput decreases due to suboptimal performance
Solution Approach 1:
The patent applies local quality by allowing different TDD slot patterns in different cell types: macrocells use downlink-centric patterns while onsite cells use uplink-centric patterns. This localized differentiation enables each cell type to optimize for its specific traffic characteristics while the boundary cell coordinates to prevent interference, thus resolving the contradiction between interference avoidance and throughput optimization.
2Productivity
If onsite cells use uplink-centric TDD slot patterns and macrocells use downlink-centric patterns to optimize for their respective traffic, then throughput increases, but interference and collisions occur at cell boundaries
Solution Approach 1:
The boundary cell acts as an intermediary between macrocells and onsite cells with conflicting TDD slot patterns. It receives traffic information from both types of cells, determines appropriate slot patterns that minimize interference, and coordinates transmissions to prevent collisions. This intermediary function enables throughput optimization in individual cells while preventing the harmful interference that would otherwise occur at boundaries.
Solution Approach 2:
The boundary cell dynamically adjusts its TDD slot pattern based on real-time traffic information received from macrocells and onsite cells. This dynamic adaptation allows the system to optimize throughput for each cell type while preventing interference through coordinated, flexible slot pattern selection rather than static configuration.
3Device complexity
If the same TDD slot pattern is used across all cells to simplify coordination, then device complexity is reduced, but resource usage efficiency decreases
Solution Approach 1:
The patent implements local quality by allowing different TDD slot patterns for different cell types (downlink-centric for macrocells, uplink-centric for onsite cells) rather than using a uniform pattern across all cells. This localized optimization improves resource usage efficiency while the boundary cell's coordination function manages the complexity of handling multiple patterns, preventing it from becoming unmanageable.
Data Source
AI summary
In some implementations, a network device may determine that a user equipment (UE) is operating in coverage of a boundary cell associated with overlapping coverage provided by a first cell and a second cell. The network device may determine that a first time division duplex (TDD) slot pattern associated with the first cell differs from a second TDD slot pattern associated with the second cell. The network device may determine a boundary region TDD slot pattern to be used for communications with the UE within the coverage of the boundary cell based on at least one of the first TDD slot pattern or the second TDD slot pattern. The network device may communicate with the UE using the boundary region TDD slot pattern.