Hybrid TDD FDD Duplexing for Wireless Interference Reduction
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Solution Overview
Problem
Next-generation wireless communication systems require a technology that efficiently supports high-speed, asymmetric multimedia services with variable data rates, while existing duplexing methods like TDD and FDD have limitations in cell coverage, interference, and cost-effectiveness, especially when transitioning between microcells and macrocells.
Innovation Solution
A wireless communication system and method that dynamically switches between time division duplexing (TDD) and frequency division duplexing (FDD) modes based on the distance of a mobile station from the base station, using a duplexing mode determination factor to optimize channel allocation and reduce interference, allowing for variable asymmetric services and reduced installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time division duplexing (TDD) is used to provide asymmetric service, then transmission efficiency is improved, but cell coverage is limited and round-trip delay increases
Solution Approach 1:
The system dynamically switches between TDD and FDD modes based on the mobile station's distance from the base station. For near mobile stations, TDD mode is used to achieve high transmission efficiency and asymmetric service. For far mobile stations, FDD mode is used to extend cell coverage and reduce round-trip delay. This dynamic adaptation resolves the contradiction between transmission efficiency and cell coverage.
2Area of stationary object
If frequency division duplexing (FDD) is used to extend cell coverage, then macrocell support is improved, but variable asymmetric service capability is reduced
Solution Approach 1:
The system dynamically selects the appropriate duplexing mode based on service requirements and mobile station location. FDD mode is used for far mobile stations to ensure coverage, while TDD mode is used for near mobile stations to provide variable asymmetric service. This dynamic selection allows the system to maintain both wide coverage and adaptive service capability.
3Productivity
If TDD mode is used for microcell to provide asymmetric service, then transmission efficiency is improved, but installation cost increases when building dense network
Solution Approach 1:
The system applies different duplexing modes to different spatial locations and service scenarios. TDD mode is applied locally to microcells where high transmission efficiency and asymmetric service are required. FDD mode is applied to macrocells where coverage and cost-effectiveness are priorities. This localized application optimizes both performance and cost.
4Speed
If TDD is used to support high data rate, then multimedia service capability is improved, but co-channel interference between mobile stations increases
Solution Approach 1:
The system dynamically switches between TDD and FDD modes based on mobile station location and traffic conditions. For near mobile stations where TDD provides high data rates, the system manages interference through dynamic time slot allocation. For far mobile stations, FDD mode is used to avoid interference issues altogether by using frequency separation. This dynamic approach maintains high data rates while controlling interference.
Data Source
AI summary
Disclosed is a wireless communication system for providing a service in a time division duplexing (TDD) mode and a frequency division duplexing (FDD) mode according to a duplexing mode determination factor of a mobile station in a base station communicating with the mobile station. During call setup, the mobile station transmits the duplexing mode determination factor to the base station, sets a TDD mode or an FDD mode as a reverse mode set by the base station, and sets up a channel for the set reverse mode and a forward channel to perform communication. During call setup, the base station receives the duplexing mode determination factor from the mobile station, sets a reverse mode to the TDD mode or the FDD mode using the received duplexing mode determination factor, and sets up a reverse channel for the set mode and a TDD mode for forward transmission to communicate with the mobile station.