V2X PSCCH PSSCH Resource Allocation for Low Delay
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Solution Overview
Problem
Current D2D communication mechanisms, as standardized in 3GPP Rel-12, fail to meet the requirements for low time delay and high reliability in V2X communication, particularly due to inefficiencies in PSCCH and PSSCH resource allocation and transmission modes, which result in increased transmission delay and reduced receiving reliability.
Innovation Solution
A method for determining and transmitting PSCCH and PSSCH resources, where a UE selects appropriate resources within PSCCH and PSSCH resource pools, allowing for flexible transmission modes (e.g., simultaneous or sequential transmission) and using bit maps and offset values to optimize resource allocation, ensuring low time delay and high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PSCCH and PSSCH resources are allocated separately with PSCCH position prior to PSSCH in Rel-12, then resource allocation simplicity is maintained, but data transmission delay increases
Solution Approach 1:
The patent merges PSCCH and PSSCH resource allocation by allowing them to be transmitted in the same subframe. The transmitting UE determines a set of resources for PSCCH transmission and a set of associated resources for PSSCH transmission, enabling simultaneous transmission and reducing the time gap between control and data channels.
Solution Approach 2:
The patent introduces dynamic resource allocation where the UE can flexibly select transmission modes (same subframe or different subframes) based on service requirements. The resource allocation adapts to different scenarios through configurable parameters like time resource patterns and frequency resource selection.
2Reliability
If resource hopping is used to solve half-duplex limitation, then receiving reliability is improved, but transmission complexity increases
Solution Approach 1:
The patent implements periodic resource hopping where PSCCH and PSSCH resources are transmitted multiple times according to predefined time resource patterns. The transmitting UE determines resource positions using periodic formulas based on subframe indices and pattern parameters, ensuring reliable reception while maintaining manageable complexity through standardized patterns.
3Ease of operation
If PSCCH is transmitted before PSSCH in separate subframes, then receiving complexity is reduced, but time delay requirement cannot be met
Solution Approach 1:
The patent enables dynamic selection between two transmission modes: Mode 1 where PSCCH and PSSCH are transmitted in the same subframe (low delay), and Mode 2 where PSCCH is transmitted before PSSCH in separate subframes (lower complexity). The selecting UE can choose the appropriate mode based on service requirements and channel conditions.
Data Source
AI summary
The application provides a method for transmitting a control channel and a data channel in V2X communication, comprising the following steps of: first, determining, by a UE, resource pool configurations for a PSCCH and a PSSCH and an association relationship between the both; then, determining, by the UE and in PSCCH resource pools or a subset of PSCCH resource pools, PSCCH resources required by one or multiple times of PSCCH transmission, and further determining, in PSSCH resource pools associated with the PSCCH resource pools or in a subset of PSSCH resource pools associated with the subset of PSCCH resource pools, time-frequency domain resources for PSSCH transmission; and finally, transmitting, by the UE, corresponding information on the determined PSCCH and PSSCH resources. By the method provided by the present application, the requirement on low time delay of V2X services can be met, and the implementation complexity of a UE can be effectively controlled.