D2D Relay ACK NACK Repeat Request Protocol
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Solution Overview
Problem
Current LTE networks face limitations in capacity and geographical coverage, especially during high load conditions and when devices are outside network coverage, necessitating the introduction of device-to-device (D2D) communications to enable efficient data transfer without relying on network entities like base stations.
Innovation Solution
A communications device implements a repeat request protocol, encoding data into units with redundant information to ensure integrity and using a relay mechanism for ACK/NACK messages to improve data recovery, allowing D2D communications even when channel quality is poor by utilizing other devices within the group to assist in message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communications are implemented to enable direct device-to-device data transfer, then network capacity and geographical coverage are improved, but coordination complexity and potential compatibility issues increase
Solution Approach 1:
The patent introduces a coordinating entity (base station or lead device) that acts as an intermediary to manage resource allocation and coordination for D2D communications. This mediator handles the complex tasks of resource assignment, interference management, and protocol coordination, thereby resolving the technical contradiction by offloading coordination complexity from the D2D devices themselves while maintaining improved network capacity and coverage.
2Area of stationary object
If D2D communications are implemented to enable communication outside network coverage, then geographical coverage is improved, but reliability of communication protocols deteriorates
Solution Approach 1:
The patent implements preliminary actions by establishing robust error detection and correction mechanisms, predefined communication protocols, and redundancy schemes before D2D communications occur outside network coverage. Devices are pre-configured with error handling capabilities and communication rules that ensure reliable operation even when network infrastructure is unavailable, thereby maintaining protocol reliability while extending geographical coverage.
3Reliability
If redundant data encoding is applied to improve data recovery integrity, then data transmission reliability is improved, but resource usage increases
Solution Approach 1:
The patent dynamically adjusts the level of redundant data encoding based on channel conditions, device capabilities, and communication requirements. By changing parameters such as error correction code rate, redundancy level, and encoding scheme according to real-time conditions, the system achieves optimal balance between data recovery integrity and resource usage, applying stronger error correction only when channel quality is poor or data importance is high.
Data Source
AI summary
A communications device and method, in which data is communicated via a wireless access interface to a destination communications device with a device-to-device communication procedure. The communications device encodes the data, as data units, for transmission to the destination communications device with a repeat request-type protocol, the encoding providing an indication whether the data has been received correctly. The communications device transmits the encoded data units to the destination communications device, and receives an acknowledgement ACK message that one of the encoded data units has been correctly received by the destination communications device, or a negative acknowledgement NACK message that the encoded data units were not received correctly by the destination communications device. The ACK or NACK message is transmitted by another communications devices of a group of communications devices, acting as a relay communications device, which received and retransmitted the ACK or NACK message from the destination communications device.