Dedicated Subframe Configuration for D2D Cellular Synchronization
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Solution Overview
Problem
In cellular communication systems, device-to-device (D2D) communication often conflicts with cellular transmission, leading to inefficient resource allocation and potential data transmission failures, especially when D2D communication uses uplink resources without proper synchronization with cellular HARQ processes.
Innovation Solution
Configuring dedicated subframes according to cellular uplink HARQ processes and generating indication signaling for user equipment to perform D2D communication, ensuring that D2D communication does not interfere with cellular transmission by allocating specific subframes for transmission and reception, and using pre-defined rules to determine the timing of these subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication uses uplink resources without proper synchronization with cellular HARQ processes, then resource allocation flexibility is improved, but transmission reliability deteriorates due to conflicts with cellular transmission
Solution Approach 1:
The patent dynamically configures dedicated subframes for D2D communication based on cellular uplink HARQ process timing. The network side determines RTT values and adjusts subframe allocations to match HARQ round-trip times, allowing the system to adapt D2D resource allocation to cellular transmission dynamics while avoiding conflicts and ensuring reliable communication for both modes.
2Reliability
If dedicated subframes are configured for D2D communication, then conflict with cellular transmission is reduced, but system complexity increases due to additional configuration and signaling
Solution Approach 1:
The patent applies preliminary action by pre-configuring dedicated subframes for D2D communication based on predicted HARQ timing patterns. The network side determines RTT values in advance and pre-allocates subframes before D2D transmission occurs, eliminating the need for real-time conflict resolution and reducing system complexity while maintaining high reliability.
Solution Approach 2:
The patent introduces indication signaling as an intermediary mechanism that carries configuration information about dedicated subframes. This signaling acts as a mediator between the network side and UE, conveying timing and resource allocation information without requiring complex direct coordination, thereby simplifying the overall system architecture while ensuring reliable D2D communication.
3Productivity
If RTT of D2D HARQ process is set to be the same as cellular uplink HARQ process, then resource allocation efficiency is improved, but adaptability to different D2D scenarios is reduced
Solution Approach 1:
The patent enables dynamic parameter changes by allowing the RTT of D2D HARQ process to be configured based on different scenarios. The network side can set the D2D RTT to be the same as, twice of, or differently from the cellular uplink RTT depending on the specific D2D communication requirements, thus achieving both resource allocation efficiency and scenario adaptability through flexible parameter adjustment.
Data Source
AI summary
Provided are methods and apparatuses for device-to-device (D2D) communication. The method includes: configuring dedicated subframe(s) according to cellular uplink hybrid automatic repeat request (HARQ) process(es), the dedicated subframe(s) being used for D2D communication (S302); generating indication signaling according to the configuration of the dedicated subframe(s), wherein the indication signaling is used for indicating the dedicated subframe(s) (S304); and transmitting the indication signaling to user equipment (S306). The technical solutions can ensure the reliability of data transmission and the compatibility of cellular transmission and D2D communication that are performed simultaneously, and improve the user experience.