D2D Resource Pattern for Low-Latency Sidelink Transmission
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Solution Overview
Problem
Current D2D communication systems face delays in sidelink transmission due to scheduled resource allocation, which is not suitable for applications requiring low latency, such as Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications, where latency requirements are in the order of milliseconds.
Innovation Solution
Introducing a low-latency D2D transmission mode with a resource pattern that includes a data channel subframe pool for data transmission and an optional control channel subframe pool for resource allocation, allowing for shorter intervals and persistent resource allocation to reduce transmission delay and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scheduled resource allocation is used for D2D transmission, then resource management is simplified and controlled by network, but transmission latency increases significantly
Solution Approach 1:
The patent introduces dynamic resource allocation modes that can switch between network-scheduled and autonomous terminal-based allocation. The system dynamically adapts the resource allocation method based on latency requirements and network conditions, allowing terminals to select from multiple modes including mode 1 (network scheduled) and mode 2 (autonomous), thereby resolving the contradiction between ease of control and transmission latency
Solution Approach 2:
The patent changes the resource allocation parameters by introducing new control signals with specific fields (e.g., time resource pattern index, resource block assignment) that enable flexible configuration of transmission timing and resources. This allows the system to adjust allocation granularity and timing parameters to reduce latency while maintaining network control capabilities
2Reliability
If traditional resource allocation modes are used, then network control is maintained, but low-latency communication requirements cannot be met
Solution Approach 1:
The patent segments the resource allocation process into different time periods and control channels. By separating control information transmission (on PSCCH) from data transmission (on PSSCH) and organizing them in specific time patterns, the system enables low-latency data transmission while maintaining network control through separate control signaling mechanisms
Solution Approach 2:
The patent implements preliminary resource allocation where the network pre-configures resource patterns and allocation frameworks before actual data transmission occurs. Control information about available resources and allocation rules is transmitted in advance, allowing terminals to make rapid decisions and execute low-latency transmissions without real-time network intervention for each data packet
Data Source
AI summary
A network apparatus (2) transmits, to at least one of a D2D transmitting terminal (1A) and a D2D reception terminal (1B), a first control signal (501) including an indication indicating which of first and second D2D transmission modes is activated. The first D2D transmission mode conforms to a first resource pattern that is repeated every first time period. The second D2D transmission mode conforms to a second resource pattern that is repeated every second time period, the second time period being the same as or different from the first time period. The second resource pattern is defined so as to allow low-latency transmission. In an example, the second resource pattern does not include a control channel subframe pool that is used for transmission of D2D control information indicating resource allocation for data transmission.