Network Coded D2D Relay for Base Station Decoding
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Solution Overview
Problem
In cellular radio networks, maintaining signal quality and reducing interference and data throughput reduction under less than optimal radio conditions is challenging, especially for wireless devices located far from the base station or in areas with poor coverage.
Innovation Solution
A method and base station configuration that obtain path gains of cellular and Device-to-Device (D2D) radio links, applying network coding when certain threshold conditions are met, allowing the second wireless device to encode and transmit data to assist the base station in decoding signals from the first wireless device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device transmits with increased power to improve signal quality at the base station, then signal quality is improved, but interference to other nearby communications increases
Solution Approach 1:
A second wireless device acts as an intermediary by receiving the first wireless device's transmission and forwarding a network-coded version to the base station. This mediator approach allows the first device to transmit at lower power while still achieving reliable delivery through the assistance of the second device, thereby reducing interference to other communications.
Solution Approach 2:
The system changes the transmission parameter by introducing network coding at the second wireless device. Instead of directly transmitting the original data, the second device applies network coding operations (such as XOR) to combine received packets, creating new coded packets that maintain information integrity while enabling successful decoding at the base station with reduced transmit power.
2Reliability
If extra bits are added to assist decoding at the base station, then decoding reliability is improved, but data throughput is reduced
Solution Approach 1:
The patent merges multiple data transmissions into a single network-coded packet at the second wireless device. By combining multiple received packets through network coding operations, the system creates a single coded packet that carries information from multiple sources, thereby improving decoding reliability without requiring separate redundant transmissions that would reduce throughput.
Solution Approach 2:
The system changes the data structure parameter by applying network coding transformations to the transmitted packets. This parameter change allows the base station to decode original data from coded versions, improving reliability while maintaining efficient use of radio resources and preserving data throughput.
3Object-generated harmful factors
If D2D communication is used to enable direct communication between wireless devices, then transmit power and interference are reduced, but the base station cannot directly decode signals from distant or poorly covered devices
Solution Approach 1:
The second wireless device serves as a D2D intermediary that receives transmissions from the first wireless device and forwards network-coded versions to the base station. This intermediary approach enables the base station to decode signals from distant or poorly covered devices by leveraging the closer, better-positioned second device as a relay, thereby maintaining decoding capability while preserving the interference-reduction benefits of D2D communication.
Solution Approach 2:
The patent introduces a new dimension to the communication architecture by implementing a hybrid D2D-cellular mode. In this mode, communication occurs through multiple paths: direct D2D links between wireless devices and cellular links between the second device and base station. This dimensional change in the communication topology allows the system to overcome distance and coverage limitations while maintaining the low-interference advantage of direct device communication.
Data Source
AI summary
A method and a base station are provided. The base station obtains a first path gain of a cellular radio link to a first wireless device, a second path gain of a cellular radio link to a second wireless device and a third path gain of a Device-to-Device radio link between the first wireless device and the second wireless device. When the first, second and third path gains satisfy a threshold condition, the base station instructs the second wireless device to apply network coding on first data transmitted from the first wireless device and to transmit a network coded form of the first data. The base station receives a radio signal with the first data transmitted from the first wireless device and uses the network coded form of the first data transmitted by the second wireless device for decoding the first data.