Dynamic Relay Selection for D2D Communication Signal Quality
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Solution Overview
Problem
Existing D2D communication systems face challenges in achieving sufficient signal quality and reducing interference and data throughput, especially under less than optimal radio conditions, particularly when wireless devices are far from fixed-position relays or base stations.
Innovation Solution
A method where a base station evaluates quality metrics for relay links, D2D links, and cellular links to select a relay mode for communication, using a candidate relay wireless device that provides better signal quality and reduced transmission power, thereby improving spectral and energy efficiency and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device transmits with increased power to provide sufficiently strong signal at the base station, then signal quality is improved, but interference to other nearby communications increases
Solution Approach 1:
The patent introduces a relay wireless device as an intermediary node between the original wireless device and the base station. The relay device receives signals from the wireless device and forwards them to the base station, enabling signal transmission without requiring the wireless device to transmit at high power directly to the base station. This mediator approach maintains signal quality while reducing interference to other communications.
2Object-generated harmful factors
If D2D communication is employed between two wireless devices, then transmit power is reduced and interference is reduced, but signal quality becomes insufficient when devices are far from each other or in bad radio coverage areas
Solution Approach 1:
The patent employs a relay wireless device as a mediator to extend D2D communication range. When direct D2D communication provides insufficient signal quality, the relay device receives signals from one wireless device and forwards them to the other, maintaining the low-power, low-interference benefits of D2D while overcoming distance and coverage limitations through the intermediary relay node.
3Reliability
If fixed-position relay devices are used to improve signal quality, then communication reliability is improved, but deployment cost increases and adaptability to different positions decreases
Solution Approach 1:
The patent transforms the relay system from static fixed-position relays to dynamic mobile relay devices. The relay wireless device can move to different positions and be dynamically selected based on current communication needs, device locations, and radio conditions. This dynamic approach maintains communication reliability while improving adaptability to different positions and reducing deployment costs by utilizing existing mobile devices as relays.
Data Source
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AI summary
A methods, base station, wireless device and candidate relay device for supporting a D2D communication between a first wireless device and a second wireless device over a relay. The base station receives (302) from the first device an identity of a candidate relay wireless device and a first quality metric (Geq) pertaining to a first relay link between the first device and the candidate relay device and to a second relay link between the second device and the candidate relay device. The base station also obtains (304) a second quality metric (G12) pertaining to a D2D link between the first and second devices, and a third quality metric (Gl BS) pertaining to a cellular link between the base station and the first device. When the first quality metric (Geq) indicates a better link quality than both the second metric (G12) and the third metric (G1 BS), the base station selects (310) a relay mode for the D2D communication with the candidate relay device as the relay and instructs the involved devices accordingly.