Repeater Group Scheduling for Interference Reduction
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Solution Overview
Problem
Communication systems using repeaters face limitations in efficiently expanding coverage and providing high-speed data channels due to shadowing areas and fluctuating channel status, leading to reduced system capacity and increased interference between repeaters.
Innovation Solution
The system selects a repeater group from multiple groups to transmit and receive data, dividing frames into macro and micro zones where the base station and repeaters transmit either the same or different data, using Time Division Multiplexing (TDM) or Frequency Division Multiplexing (FDM) to minimize interference and maximize capacity by isolating micro-zone repeaters and scheduling them based on predefined metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If repeaters are used to expand coverage area, then coverage area is improved, but interference between repeaters increases
Solution Approach 1:
The system segments repeaters into different repeater groups that operate on different time slots or frequency resources. This segmentation allows multiple repeaters to coexist without causing mutual interference, while still achieving coverage expansion across the entire service area.
Solution Approach 2:
The patent implements periodic transmission patterns where repeater groups alternately transmit data in different time slots. This periodic action ensures that only one repeater group is active at any given time, eliminating interference while maintaining continuous coverage through systematic switching between groups.
2Speed
If repeaters transmit data simultaneously, then data transmission speed is improved, but system capacity is reduced due to interference
Solution Approach 1:
The system dynamically selects which repeater group transmits data based on current channel conditions, MS location, and traffic requirements. This dynamic adaptation allows the system to optimize both transmission speed and overall capacity by activating the most appropriate repeater group for each transmission scenario.
Solution Approach 2:
The patent changes transmission parameters such as time slot allocation and frequency assignment based on system load and interference conditions. By adjusting these parameters dynamically, the system maintains high data transmission speeds while preventing capacity degradation from interference.
3Productivity
If multiple repeater groups are used to increase system capacity, then resource utilization is improved, but complexity of scheduling increases
Solution Approach 1:
The system segments the repeater network into distinct, non-overlapping repeater groups with predetermined resource allocations. This segmentation simplifies scheduling by creating manageable units that can be independently controlled, reducing the overall scheduling complexity while maintaining high system capacity.
4Productivity
If BS transmits different data than repeaters, then resource utilization is improved, but coordination complexity increases
Solution Approach 1:
The base station acts as an intermediary that coordinates data transmission between itself and repeater groups. The BS receives data, determines which repeater group should transmit, and manages the data flow accordingly. This intermediary role simplifies coordination by centralizing control while enabling differentiated data transmission that improves resource utilization.
Data Source
AI summary
An apparatus and method for transmitting and receiving data in a communication system are provided. In the method, a BS selects a repeater group from among a plurality of repeater groups, for use in transmitting first data to an MS and transmits the first data to the MS according to the number of repeaters of the selected repeater group. The first data is different from data transmitted by the repeaters of the selected repeater group.