Cooperative Relay Clusters for Mobile Station Access
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Solution Overview
Problem
In mobile communication systems, the increasing number of users and bandwidth requirements limit the number of mobile stations that can be connected to a single base station, as each base station must transmit strong signals to cover a larger area, while relays transmit data with limited power, leading to inefficient use of wireless resources.
Innovation Solution
The system divides the base station's coverage into clusters, with each cluster consisting of multiple relays that cooperate to transmit data to mobile stations, allowing mobile stations to select the best cluster for connection based on preamble signals and transmit access requests through the most reliable relay, enabling efficient data transmission paths and potential handovers between clusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a base station transmits strong signals to cover a larger area, then the coverage area is improved, but the power consumption and energy efficiency deteriorate
Solution Approach 1:
The patent segments the base station's coverage area into multiple clusters, each served by a relay node. Instead of one base station transmitting to all mobile stations directly, the coverage is divided into cluster service areas with relays acting as intermediate nodes. This segmentation allows lower-power relays to serve local mobile stations, reducing overall power consumption while maintaining extensive coverage.
Solution Approach 2:
The patent introduces relay nodes as intermediary devices between base stations and mobile stations. These relays receive signals from base stations and retransmit them to mobile stations within their cluster coverage. The relays act as mediators that extend coverage without requiring the base station to transmit directly to all distant mobile stations, thereby reducing power consumption.
2Quantity of substance
If the number of mobile stations connected to a single base station is increased, then the system capacity is improved, but the bandwidth per mobile station deteriorates
Solution Approach 1:
The patent segments mobile stations into different clusters based on their locations and connection requirements. Each cluster is served by a dedicated relay node, which manages bandwidth allocation for its member mobile stations. This segmentation allows the system to support more mobile stations overall while maintaining adequate bandwidth for each, as relays can prioritize and allocate resources more efficiently than a single base station could for all stations.
3Use of energy by moving object
If relays transmit data with limited power, then energy efficiency is improved, but the transmission range deteriorates
Solution Approach 1:
The patent segments the overall transmission range into smaller local segments within each cluster. Each relay transmits with limited power only to mobile stations within its specific cluster service area, rather than attempting to cover the entire base station coverage area. This segmentation of the transmission range allows relays to operate energy-efficiently while still providing coverage where needed.
Solution Approach 2:
The patent extends the communication architecture from a single-dimensional base station-to-mobile-station transmission to a multi-dimensional hierarchical structure involving base stations, relays, and mobile stations at different levels. This dimensional change allows limited-power relay transmissions to achieve effective coverage by combining multiple relay transmissions across different spatial and hierarchical dimensions, compensating for the reduced transmission range of individual relays.
Data Source
AI summary
A mobile station which connects to a base station having a plurality of relays belonging thereto is provided. The mobile station includes a receiving unit which receives a first preamble signal from a first relay and receives a second preamble signal from a second relay, the first relay belonging to a first cluster including an N1 number of relays and the second relay belonging to a second cluster including an N2 number of relays, a control unit which selects the first cluster as an access cluster to connect to the base station, based on the first preamble signal and the second preamble signal, and a transmission unit which transmits an access request message to the first relay, wherein the access request message is transmitted to the base station via the first relay.