Relay Node Uplink Resource Allocation for MTC Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication networks, especially in LTE systems, Machine Type Communication (MTC) devices face challenges with uplink power limitations due to reduced system gain, which hinders efficient data transmission from low-power MTC devices to base stations, particularly at the cell edge.
Innovation Solution
A wireless communications system and method that employs a relay device to receive uplink data from terminal devices and retransmit it to the base station using allocated resources, with the relay device monitoring shared channels for resource allocations and managing power control and timing advances to enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices transmit uplink data directly to the base station, then the system maintains simple topology, but the uplink power limitation reduces transmission reliability especially at cell edge
Solution Approach 1:
The patent introduces a relay device as an intermediary node between the MTC terminal device and the base station. The relay device receives uplink data from the MTC device and forwards it to the base station, effectively extending the uplink coverage and improving transmission reliability for low-power MTC devices at the cell edge without requiring complex changes to the MTC device itself.
2Productivity
If the relay device monitors shared channels for resource allocations, then the resource allocation efficiency improves, but the relay device's processing complexity increases
Solution Approach 1:
The relay device autonomously monitors shared channels for resource allocations intended for MTC terminal devices and independently derives the corresponding uplink resources for relaying data to the base station. This self-service mechanism enables the relay device to efficiently allocate resources without requiring additional complex control signaling or centralized coordination, thereby improving resource allocation efficiency while keeping processing complexity manageable.
3Productivity
If uplink resources are allocated to both terminal device and relay device, then the data transmission capacity increases, but the system's resource management complexity increases
Solution Approach 1:
The base station pre-allocates uplink resources to the MTC terminal device and simultaneously provides indication information to the relay device about these allocated resources. The relay device then uses this indication information to derive and allocate corresponding uplink resources for forwarding the data to the base station. This preliminary action of resource allocation and indication reduces the need for complex real-time resource management coordination, thereby increasing data transmission capacity while managing resource management complexity.
Data Source
AI summary
A wireless communications system is described which comprises a base station, a relay device, and a terminal device. The terminal device is operable to receive from the base station an allocation of uplink resources for transmitting uplink data to the relay device, and to transmit uplink data to the relay device using the uplink resources allocated to the terminal device. The relay device is operable to receive the transmitted uplink data from the terminal device on the allocated resources, to receive an allocation of uplink resources for relaying the received uplink data to the base station, and to transmit the received uplink data to the base station using the uplink resources allocated to the relay device.