D2D Communication Retransmission Configuration and Frequency Hopping
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Solution Overview
Problem
In device-to-device (D2D) communication, the absence of HARQ feedback mechanisms in LTE-A standard leads to challenges in ensuring accurate and efficient information transmission, particularly due to the transplantation of base station functions onto user equipment, which affects signal reception accuracy and resource utilization.
Innovation Solution
A resource scheduling scheme and retransmission frequency hopping technology are introduced to support efficient information transmission in D2D communication, where configuration information is generated to manage retransmissions and frequency resources are hopped to improve reception accuracy and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented without HARQ feedback mechanism, then base station load is reduced and communication distance is shortened, but information transmission accuracy deteriorates
Solution Approach 1:
The patent introduces an ACK/NACK feedback mechanism specifically for D2D communication, where receiving user equipment sends acknowledgment signals back to transmitting user equipment. This resolves the contradiction by providing necessary feedback for transmission accuracy while maintaining D2D communication independence from base station HARQ mechanisms, thus reducing base station load while improving reliability.
Solution Approach 2:
The patent uses the receiving user equipment as an intermediary to provide feedback to the transmitting user equipment, rather than requiring base station involvement. This intermediary feedback mechanism ensures accurate information transmission in D2D communication while keeping the base station out of the direct communication loop, thereby reducing base station load.
2Reliability
If retransmission frequency hopping is implemented, then information transmission accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements frequency hopping for retransmissions, where the frequency resource changes dynamically between initial transmission and retransmission. This dynamic frequency adjustment improves transmission accuracy by avoiding persistent interference on the same frequency, while the hopping pattern is pre-configured to manage complexity.
Solution Approach 2:
The patent changes the frequency parameter between initial transmission and retransmission, allowing the system to adapt to different channel conditions. This parameter change improves transmission reliability by selecting different frequency resources, while the change follows predetermined rules to control system complexity.
3Productivity
If frequency resources are hopped for retransmission, then resource utilization is improved, but device complexity increases
Solution Approach 1:
The patent pre-configures frequency hopping patterns and retransmission resources before actual communication occurs. This preliminary configuration allows the devices to automatically follow the predetermined hopping pattern, improving resource utilization across different transmissions while minimizing the complexity of real-time resource management.
Solution Approach 2:
The patent implements periodic frequency hopping for retransmissions, where resources are systematically allocated in a repeating pattern. This periodic approach improves resource utilization by ensuring diverse frequency usage over time, while the regular pattern simplifies device implementation compared to arbitrary resource allocation.
Data Source
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AI summary
Provided are an apparatus and method in a wireless communication system. The apparatus may comprise: a configuration information generation unit configured to generate configuration information about a user equipment comprising retransmission time related information and used for performing device-to-device communication, wherein the re-transmission time related information represents information related to retransmission times of signal transmission with a user equipment performing device-to-device communication; and a transmission unit configured to transmit the generated configuration information to the user equipment performing device-to-device communication. According to the embodiments of the present disclosure, a signal in device-to-device communication can be ensured to be accurately and completely transmitted between various communication devices participating in the communication, and thus the transmission performance of information is improved,