Configurable HARQ RTT for D2D PUCCH Resource Allocation
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Solution Overview
Problem
In device-to-device (D2D) communication, there is a challenge in defining Hybrid Automatic Repeat Request (HARQ) Round Trip Time (RTT) and managing PUCCH resource conflicts, which affect the efficiency of data transmission and network performance.
Innovation Solution
A method is introduced to configure HARQ RTT for D2D communication, allowing user equipment to transmit reception confirmation responses on a physical uplink control channel, with the RTT configuration tailored to each user equipment based on specific indices and capabilities, and determining PUCCH resources using formulas that consider RTT configuration and other parameters to avoid resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is introduced to reduce network overload, then network burden on eNode B is reduced, but PUCCH resource conflicts occur due to undefined HARQ RTT
Solution Approach 1:
The patent applies parameter changes by introducing configurable HARQ RTT parameters (k1 values) that can be adjusted based on D2D communication requirements. Different RTT configurations are defined with specific k1 values to accommodate varying propagation delays and processing times in D2D scenarios, thereby resolving resource conflicts while maintaining network productivity
Solution Approach 2:
The patent implements dynamics by making the HARQ RTT configuration flexible and adaptable rather than fixed. The system can dynamically select different RTT configurations based on channel conditions, device capabilities, and traffic patterns, allowing the network to optimize performance while avoiding PUCCH resource conflicts in diverse D2D scenarios
2Device complexity
If fixed HARQ RTT is used for simplicity, then system complexity is reduced, but data transmission speed is limited due to inability to adapt to D2D specific requirements
Solution Approach 1:
The patent applies segmentation by dividing the HARQ RTT configuration into multiple discrete options with different k1 values. Each configuration represents a segmented time slot pattern that can be independently selected, providing a balance between system complexity and transmission speed by offering pre-defined optimal settings for different D2D scenarios
3Ease of manufacture
If D2D communication is implemented without RTT configuration, then deployment is simplified, but resource conflicts and network performance degradation occur
Solution Approach 1:
The patent implements universality by designing a multi-functional RTT configuration mechanism that serves both traditional cellular communication and D2D communication requirements. The same configuration framework can be applied to different communication modes, providing ease of deployment while ensuring optimal network performance through unified resource management
Data Source
AI summary
According to one embodiment of the present invention, a method for transmitting a reception acknowledgement response by an user equipment for performing device-to-device communication in a wireless communication system, comprises the steps of: receiving a physical downlink shared channel; and transmitting a reception acknowledgement response for the physical downlink shared channel on a resource for a physical uplink control channel, wherein the reception acknowledgement response is transmitted according to a setting of a round trip time (RTT), and the RTT is set for each user equipment.