Dynamic Frame Duration Control for Wireless Interference Mitigation
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Solution Overview
Problem
In wireless communications systems, recurring interference from external devices can extend across frame boundaries in TDMA systems, complicating interference mitigation and reducing the effectiveness of per-frame measurements, as it affects multiple frames and is not contained within a single frame.
Innovation Solution
A base station determines frame duration and start times based on the periodicity and location of recurring interference, matching frames to interference intervals to maximize time free from heavy interference, and adjusts frame configurations dynamically in response to changes in interference patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If per-frame interference mitigation is used, then interference measurement and mitigation can be performed on a manageable time scale, but interference affecting multiple frames cannot be properly mitigated since it extends across frame boundaries
Solution Approach 1:
The frame duration is made dynamically adjustable rather than fixed. The base station determines an adjusted frame duration based on detected recurring interference characteristics, allowing the frame structure to adapt to interference patterns. This dynamic adjustment enables the system to optimize frame timing to avoid or minimize recurring interference while maintaining effective per-frame mitigation capabilities.
Solution Approach 2:
The system changes the frame duration parameter based on detected interference patterns. By measuring recurring interference and determining its characteristics, the base station adjusts the frame duration parameter to align with or avoid interference intervals, thereby improving interference mitigation effectiveness while maintaining system productivity.
2Ease of operation
If frame duration is fixed, then device coordination and timing synchronization are simplified, but the system cannot adapt to recurring interference patterns that affect communication quality
Solution Approach 1:
The frame duration transitions from a fixed value to a dynamically adjustable parameter. The base station monitors recurring interference and adjusts the frame duration accordingly, allowing the system to maintain simple coordination during normal operation while adapting to interference conditions when detected, thus preserving both ease of operation and communication reliability.
Solution Approach 2:
The system performs self-adjustment by automatically detecting recurring interference patterns and modifying its own frame duration parameter without external intervention. This self-service capability allows the system to maintain reliability under interference while keeping the operation simple through automated adaptation.
3Use of energy by moving object
If frame timing is synchronized to external signals like GPS, then devices can operate in a power-efficient manner with good signal reception opportunities, but interference from external devices operating on different networks cannot be avoided
Solution Approach 1:
The system maintains power efficiency through synchronized operation while adding dynamic frame duration adjustment capability. By detecting recurring interference patterns and adapting frame timing, the system can avoid interference periods while maintaining synchronization benefits, thus preserving power efficiency without being vulnerable to external interference.
Solution Approach 2:
The base station acts as an intermediary that detects interference patterns and mediates between the need for synchronized power-efficient operation and the need to avoid interference. It adjusts frame duration as an intermediate parameter to align communication windows with low-interference periods, maintaining both power efficiency and interference avoidance.
Data Source
AI summary
Methods and apparatus for controlling frame timing and/or duration in a wireless communications network are described. Recurring interference is monitored for, detected and evaluated. Frame structure to be used in the network is determined based on the detected recurring interference in one or more monitored frequency bands. An implemented frame structure is changed dynamically in response to a detected new pattern of interference. Uplink and downlink timing and frame duration maybe determined separately, e.g., based on interference which affects uplink and downlink communications, respectively. Devices, e.g., base stations, may independently determine frame start times and durations based on detected interference or may communicate with one another to reach a consensus on a frame start time and duration to be used by multiple base stations. Downlink frame start times and durations may be based on interference information reported by one or more devices, e.g., mobile user equipment devices.