TDD Time Zone Allocation for Wireless Interference Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless networks face interference issues due to signal fading and interference between radio transmitters, leading to bandwidth loss, signal corruption, and increased power requirements, and the cost of upgrading systems to accommodate changing user demands is a significant challenge, especially when frequency allocation is costly and unpredictable.
Innovation Solution
Implementing Time Division Duplex (TDD) techniques to control transmission timing in wireless networks by allocating time zones with dead times for base stations to reduce interference, allowing for efficient bandwidth allocation and dynamic reconfiguration without hardware modifications, enabling coexistence of different wireless transmission systems like OFDM and OFDMA on the same frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If FDD mechanisms are used to run multiple radios in a physical location, then interference between radio transmitters is reduced, but bandwidth is lost and signal corruption occurs due to signal fading
Solution Approach 1:
The patent divides the time period into multiple time zones and further segments each time zone into transmit zones, receive zones, and dead times for different base stations. This temporal segmentation allows multiple base stations to share the same frequency spectrum without simultaneous transmission, reducing interference while maintaining bandwidth utilization.
Solution Approach 2:
The patent implements periodic transmission patterns where base stations alternate between transmit and receive periods in a cyclic manner. Each base station follows a periodic schedule of transmitting during its assigned time zones and remaining silent during others, creating regular interference patterns that can be managed and optimized.
2Adaptability or versatility
If separate frequencies are allocated for different wireless transmission systems (OFDM and OFDMA), then system compatibility is improved, but system cost and complexity increase
Solution Approach 1:
The patent creates a universal time zone structure that can accommodate multiple wireless transmission systems (OFDM and OFDMA) on the same frequency. The time zone framework serves as a universal scheduling mechanism that both system types can operate under, eliminating the need for separate frequency allocations and reducing system complexity.
Solution Approach 2:
Instead of resolving compatibility issues in the frequency domain by allocating separate frequencies, the patent moves the differentiation to the time domain. By using time zones and dead times as an additional dimension for coordination, multiple systems can coexist on the same frequency without interference, transforming a frequency-based problem into a time-based solution.
3Object-affected harmful factors
If dead times are inserted between transmit zones for different base stations, then interference is reduced, but transmission efficiency decreases
Solution Approach 1:
The patent applies local quality by assigning different time zone characteristics to different base stations based on their specific interference patterns and traffic demands. Each base station receives customized time zone allocations with strategically placed dead times, allowing optimized interference reduction tailored to each station's local conditions rather than a uniform approach.
Data Source
AI summary
Systems and methods are described for controlling transmission in a wireless network. In these systems and methods a sequence of time zones may be provided whereby each time zone can be allocated to one of a plurality of base stations. For each base stations dead times in the sequence are identified in which the e base station is prohibited from transmitting and receiving. The dead times for the base station may correspond to transmit or receive zones of at least one other base station. The dead times can be interleaved with transmit zones and receive zones assigned to the base station. Configuration and duration of the dead times may be selected to reduce interference between base stations. Base stations can support different wireless transmission systems including OFDM and OFDMA systems and others.