D2D User Device Resource Allocation for V2X Delay
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Solution Overview
Problem
Existing D2D communication systems face inefficiencies in transmitting and receiving small packets due to wasteful resource allocation and high delays, particularly in V2X applications where low latency is critical.
Innovation Solution
The proposed solution involves a user device that employs a wireless frame configuration with frequency-multiplexed PSCCH and PSSCH, allowing for concurrent transmission of SCI and data, and optionally using a virtual resource pool for prioritized data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless resources are allocated consecutively and periodically by short intervals for PSSCH as in conventional D2D communication, then VoIP communication can be supported effectively, but resource allocation becomes wasteful and delay increases for V2X small packet transmission
Solution Approach 1:
The patent applies dynamics by making the resource allocation pattern adaptable to different communication types. The system dynamically switches between consecutive periodic allocation (for VoIP) and non-consecutive/event-triggered allocation (for V2X small packets). This allows the resource allocation mechanism to adjust its behavior based on the specific communication requirements, resolving the contradiction between efficiency for VoIP and low delay for V2X.
Solution Approach 2:
The patent changes the timing parameters of resource allocation based on communication type. For V2X small packets, it uses event-triggered transmission with longer intervals rather than fixed short-period periodic allocation. This parameter change allows small packets to be transmitted only when necessary, reducing waste and delay while maintaining VoIP efficiency through separate resource pool configuration.
2Device complexity
If resource pools for PSCCH and PSSCH are allocated with periods of 40 ms or longer, then resource allocation is simplified, but delay increases for time-critical V2X communication
Solution Approach 1:
The patent segments the resource pool into multiple sub-pools with different periodicities. One resource pool can maintain the 40 ms period for general operations, while another resource pool is configured with shorter periods for time-critical V2X communication. This segmentation allows the system to maintain simplicity for non-critical traffic while providing low-delay paths for critical traffic.
Solution Approach 2:
The patent creates a multi-functional resource allocation system where resource pools can serve different purposes based on configuration. The same base resource pool structure supports both long-period allocations (for simplicity) and short-period allocations (for low delay) through configurable parameters. This universality allows a single system to handle both complexity-reduced and delay-critical scenarios.
3Ease of operation
If PSCCH and PSSCH use separate resource pools with long periods, then resource management is simplified, but resource utilization efficiency decreases for diverse communication patterns
Solution Approach 1:
The patent adds a dimensional layer to resource management by introducing multiple resource pools with different characteristics rather than using a single monolithic pool. This dimensional change allows the system to maintain simple management for each individual pool while achieving high utilization efficiency across the entire resource space by directing different traffic types to appropriately configured pools.
Data Source
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AI summary
A terminal comprises a reception unit configured to receive, in a unit resource that forms a radio resource, control information for device-to-device communication, D2D, and data corresponding to the control information for D2D by using a physical control channel for D2D and a physical data channel for D2D, wherein the physical control channel for D2D and the physical data channel for D2D are multiplexed by at least one of frequency-multiplexing and time-multiplexing; and a control unit configured to obtain the data based on the control information for D2D, wherein the reception unit receives, in the unit resource, a reference signal that is time-multiplexed with the physical control channel for D2D and the physical data channel for D2D.