Distributed Time Scheduling for Wireless Base Station Interference
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Solution Overview
Problem
Conventional interference control methods in wireless communication systems face challenges with scalability and effective interference reduction in densely distributed base stations, especially in scenarios with insufficient computing power and unplanned distribution of femtocell access points, leading to increased interference and reduced communication performance.
Innovation Solution
A scheduling method where mobile stations receive number information from neighbor base stations through a specific downlink channel, determine which base station to transmit and receive data based on predefined rules, and signal other base stations to refrain from data transmission and reception, using a contention-based distributed time scheduling scheme to allocate frame resources efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations are densely distributed to improve coverage and data transmission rate, then communication performance is improved, but interference between base stations increases
Solution Approach 1:
The patent implements time-division scheduling where base stations transmit data in periodic time units (subframes). Each base station is allocated specific time slots for data transmission, creating a periodic pattern that prevents simultaneous transmissions and reduces interference while maintaining high data transmission rates through dense base station deployment
2Object-affected harmful factors
If conventional interference control methods are used to reduce interference, then interference between base stations is reduced, but scalability and effectiveness in densely distributed scenarios deteriorate
Solution Approach 1:
The patent employs a distributed scheduling approach where each base station autonomously determines its data transmission timing based on locally available information about neighboring base stations. This self-service mechanism eliminates the need for complex centralized coordination, enabling the system to scale effectively to dense deployments while maintaining interference reduction
Solution Approach 2:
Base stations exchange scheduling information in advance through dedicated signaling channels before data transmission begins. This preliminary action allows each base station to pre-determine non-overlapping time slots, preventing interference before it occurs and enabling scalable deployment without real-time coordination overhead
3Object-affected harmful factors
If frequency resources are allocated to reduce interference, then interference control is achieved, but resource utilization efficiency decreases
Solution Approach 1:
The patent transitions from frequency-domain interference control to time-domain interference control. By allocating time slots instead of frequency resources, the system reduces interference between densely deployed base stations while maintaining efficient use of the available frequency spectrum, as all base stations can potentially use the full bandwidth during their allocated time slots
Data Source
AI summary
In the MS apparatus for performing scheduling, a reception module receives any number information through a specific downlink channel in a first time unit from each of neighbor BSs. A scheduling module determines, among the neighbor BSs, a BS which is to transmit and receive data using a downlink data transmission region and an uplink data reception region, respectively, in a second time unit according to a previously set rule based on the number information. A transmission module transmits a signal, indicating that data transmission and reception using the downlink transmission region and uplink data reception region, respectively, in the second time unit are not possible, to the other neighbor BSs excluding the determined BS among the neighbor BSs.