TDD Radio Relay Station Interference Control
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Solution Overview
Problem
Radio relay stations in TDD-based radio communication systems face interference issues between transceivers, and radio terminals experience increased processing load and power consumption when selecting between radio base stations and relay stations as communication counterparts.
Innovation Solution
A radio relay station with a controller that adjusts transmission and reception periods to prevent interference without changing communication frequencies, and a location management system that ranks potential communication counterparts by distance to reduce the terminal's search processing load and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the radio relay station uses TDD scheme for bidirectional communication, then communication efficiency is improved, but mutual interference between first transceiver and second transceiver occurs
Solution Approach 1:
The communication frame is segmented into multiple subframes, and the relay station is configured to transmit and receive signals in specific subframes rather than simultaneously in the entire frame. The first transceiver transmits in the first subframe while the second transceiver receives in the same subframe, and vice versa in the second subframe, thereby segmenting the time domain to avoid mutual interference while maintaining bidirectional communication efficiency
Solution Approach 2:
The relay station operates with periodic transmission and reception cycles where the first transceiver and second transceiver alternate their operations in a periodic manner. The controller configured the first transceiver to transmit in the first subframe and receive in the second subframe, while the second transceiver does the opposite, creating a periodic action pattern that eliminates simultaneous transmission and reception interference
2Reliability
If the radio terminal performs search processing on all candidate radio base stations and relay stations, then the best communication counterpart is selected, but processing load and power consumption increase
Solution Approach 1:
The location management device performs preliminary action by calculating and providing ranking information about candidate radio base stations and relay stations based on their locations and the terminal's location before the terminal actually performs search processing. This preliminary ranking allows the terminal to focus its search processing only on the top-ranked candidates rather than all candidates, thereby reducing processing load and power consumption while still selecting the best communication counterpart
Solution Approach 2:
The location management device acts as an intermediary that provides ranking information to the terminal. Instead of the terminal independently evaluating all candidates which consumes high energy, the location management device pre-processes the candidate list and provides ranked information, serving as an intermediary that reduces the terminal's processing burden while maintaining reliable communication quality selection
Data Source
AI summary
Provided is a radio relay station which relays data transmitted and received by a radio base station a radio terminal in a radio communication system which employs the TDD scheme. The radio relay station receives data from the radio base station during a downlink subframe period and transmits data to the radio base station during an uplink subframe period. The radio relay station sets a remote side transmission period for transmitting data to the radio terminal in the uplink subframe period and sets a remote side reception period for receiving data from the radio terminal in the downlink subframe period.