Radio Relay Node Multiuser Broadcast for IoT Coverage
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Solution Overview
Problem
Current radio terminals for machine type communication (MTC) and Internet of Things (IoT) services face challenges in cost reduction, coverage expansion, and low power consumption, particularly in enhanced coverage areas where signal power is low, necessitating improved reachability without increasing costs.
Innovation Solution
A mobile communication system comprising a radio base station managing both standard and enhanced coverage areas, a radio relay node that receives and transmits data to multiple radio terminals in enhanced coverage, and a radio terminal that processes control signals and receives data from the relay node, utilizing multiuser broadcast transmission to enhance data reachability while maintaining low costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiuser broadcast transmission is used to improve data reachability in enhanced coverage areas, then coverage expansion is achieved, but device complexity increases due to the need for relay nodes and coordinated transmission
Solution Approach 1:
A relay node is introduced as an intermediary between the base station and radio terminals in enhanced coverage areas. The relay node receives data from the base station and forwards it to multiple terminals simultaneously, enabling coverage expansion without requiring the base station to directly communicate with all terminals, thus managing system complexity through functional decomposition
2Reliability
If relay nodes are deployed to extend coverage to enhanced coverage areas, then reachability is improved, but cost increases due to additional network infrastructure
Solution Approach 1:
The relay node is designed to serve multiple radio terminals simultaneously through multiuser broadcast transmission. By enabling one relay node to handle multiple terminals rather than requiring separate infrastructure for each terminal, the solution achieves improved data reachability while controlling deployment costs through resource sharing
3Ease of operation
If control signals are transmitted from base station or relay node to manage data reception, then communication control is achieved, but power consumption increases at the radio terminal
Solution Approach 1:
The system transmits control signals from the base station or relay node to radio terminals to manage data reception. These control signals enable terminals to efficiently determine when and how to receive data, providing communication control while allowing terminals to enter low-power states during periods without active data reception, thus balancing control capability with power consumption
Data Source
AI summary
A mobile communication system comprises a radio base station configured to manage a cell having a first coverage and a second coverage which is a portion enhanced more than the first coverage; a radio relay node configured to receive, from the radio base station, a plurality of data having different destination radio terminals from each other, and transmit the plurality of data simultaneously to a plurality of radio terminals in the second coverage; and a radio terminal configured to be located in the second coverage, receive one or a plurality of control signals transmitted from the radio base station or the radio relay node. The radio terminal is configured to perform a process of receiving data addressed to own radio terminal from the radio relay node based on the one or the plurality of control signals.