Terminal Device Transmission Power Control for D2D Interference
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Solution Overview
Problem
Current wireless telecommunications systems face challenges in managing congestion and interference in device-to-device communications, particularly in Intelligent Transport Systems, where large numbers of devices need to communicate rapidly and reliably, leading to potential network overload.
Innovation Solution
Terminal devices in these systems adjust their transmission power levels based on detected nearby devices, using beacon signaling or adaptive power adjustment schemes to restrict the number of receiving devices, ensuring only a predetermined number can receive communications, thereby reducing congestion and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If device-to-device communications are implemented to enable direct communication between terminal devices, then communication efficiency and speed are improved, but network congestion and interference increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power levels based on the number of detected nearby devices. When fewer devices are detected, higher transmission power is used to maximize communication range and efficiency. When more devices are detected, transmission power is reduced to minimize interference and congestion, thus resolving the contradiction between communication efficiency and interference.
2Area of stationary object
If transmission power is increased to extend communication range, then coverage area is improved, but radio interference and congestion increase
Solution Approach 1:
The patent implements dynamics by making transmission power adaptive rather than fixed. The terminal device continuously monitors the number of nearby devices and dynamically adjusts its transmission power accordingly. This dynamic adjustment allows the system to maximize coverage area when needed while minimizing radio interference when device density is high, resolving the contradiction between coverage area and radio interference.
3Productivity
If more terminal devices communicate simultaneously, then system capacity is improved, but congestion and communication reliability deteriorate
Solution Approach 1:
The patent applies feedback by having terminal devices monitor the number of nearby devices and use this information to adjust their transmission power. This feedback mechanism ensures that when many devices are present, transmission power is reduced to maintain communication reliability and avoid congestion. When fewer devices are present, transmission power can be increased to maximize system capacity, thus resolving the contradiction between system capacity and communication reliability.
Data Source
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AI summary
A terminal device for use in a wireless telecommunications system comprising a plurality of terminal devices operable to communicate with one another in a device-to-device manner, wherein the terminal device comprises a controller unit and a transceiver unit configured to operate together to cause the terminal device to determine a transmission power level to use for device-to-device transmissions from the terminal device to restrict the number of the other terminal devices able to receive the device-to-device transmissions to a restricted subset of the other terminal devices, and to transmit device-to-device communications using the determined transmission power level. The terminal device may determine the transmission power itself or from control signalling reads received from network infrastructure equipment, such as a base station or roadside unit.