HARQ Carrier Allocation for D2D Communication
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in performing Hybrid Automatic Repeat Request (HARQ) in collaborative transmission scenarios, particularly in machine-to-machine (M2M) communication, where reliable data transmission and error correction are crucial but challenged by the need for efficient resource allocation and timing synchronization between devices.
Innovation Solution
A method is introduced where a secondary carrier is allocated from a base station for collaborative transmission, allowing devices to receive preambles and configuration information, transmit data, and receive acknowledgement or non-acknowledgement signals, with specific frame structures and subframe allocations to optimize HARQ processes, enabling efficient error correction and retransmissions between devices and the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate carrier is allocated for collaborative transmission, then the reliability of HARQ processes is improved, but the device complexity increases
Solution Approach 1:
The patent segments the communication spectrum into a primary carrier for traditional base station-termina communication and a secondary carrier for collaborative transmission between terminals. This segmentation allows independent optimization of HARQ processes on each carrier, improving reliability while managing complexity through clear functional separation.
Solution Approach 2:
The base station acts as an intermediary that allocates the secondary carrier to terminals for collaborative transmission. This intermediary role enables the base station to coordinate HARQ processes between terminals without requiring direct peer-to-peer negotiation, simplifying the overall system complexity while maintaining high reliability.
2Stability of the object's composition
If frame structure information is transmitted through the secondary carrier, then the timing synchronization is improved, but the loss of time increases
Solution Approach 1:
The patent implements preliminary action by transmitting frame structure information and synchronization signals in the downlink subframe of the secondary carrier before the uplink collaborative transmission begins. This allows terminals to prepare their HARQ processes and timing synchronization in advance, reducing overall transmission time while maintaining precise timing alignment.
Solution Approach 2:
The patent establishes continuity of useful action by maintaining the secondary carrier for both downlink frame structure transmission and uplink collaborative transmission without interruption. The linked downlink and uplink subframes operate continuously, eliminating idle periods and reducing time loss while preserving timing synchronization through uninterrupted signal transmission.
Data Source
AI summary
A method for performing a device to device (D2D) communication is performed by a first wireless device and includes receiving, by the first wireless device through a primary carrier, an allocation of a secondary carrier from a base station. Here, the primary carrier is used for data transmission and reception with the base station and the secondary carrier allocated by the base station is used for data transmission and reception with a second wireless device. The method further includes transmitting data to the second wireless device on a subframe of the secondary carrier.