V2X PSCCH-PSSCH Time Division for Lower Transmission Delay
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Solution Overview
Problem
The existing LTE-V2X system faces challenges in achieving higher throughput, lower delay, and more flexible resource allocation for Vehicle-to-Everything (V2X) communication due to the requirement for terminals to detect all control information before data, leading to increased delay and inefficiencies.
Innovation Solution
Implementing time division transmission for Physical Sidelink Control Channel (PSCCH) and Physical Sidelink Shared Channel (PSSCH) in the V2X system, with separate resource pools for control and data channels, allowing for reduced delay and improved scheduling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals detect all control information before data in LTE-V2X system, then control information can be fully received and processed, but transmission delay increases
Solution Approach 1:
The patent segments control information into two types: Type 1 SCI transmitted on PSCCH and Type 2 SCI transmitted on PSSCH. This segmentation allows receivers to obtain scheduling information (Type 1) before data (Type 2), enabling earlier preparation and reducing overall transmission delay while maintaining complete control information reception.
Solution Approach 2:
The patent implements preliminary transmission of Type 1 SCI containing scheduling information before the actual data transmission. Receivers can perform preliminary processing, resource allocation preparation, and buffer setup based on Type 1 SCI, thereby reducing the critical path delay when Type 2 SCI and data arrive.
2Adaptability or versatility
If separate resource pools are used for control and data channels, then resource allocation flexibility improves, but system complexity increases
Solution Approach 1:
The patent designs a unified resource pool structure where PSCCH and PSSCH can share or separately use resources based on configuration. The same physical resources can serve dual purposes: carrying Type 1 SCI for control and Type 2 SCI for data scheduling, reducing the need for completely separate resource pools while maintaining flexibility.
Solution Approach 2:
The patent enables dynamic configuration of resource pool parameters including time-frequency resource allocation, cyclic shift values, and root sequence indices. These parameters can be adaptively adjusted based on traffic conditions, allowing the system to optimize between control and data resources without fixed rigid separation.
Data Source
AI summary
Provided are a control information transmission method and apparatus, a resource configuration method and apparatus, and a communication device. The method includes: transmitting first control information between a first terminal and a second terminal, the first control information being borne on a first control channel and used for scheduling transmission of a first data channel, and the first data channel being used for transmitting data between the first terminal and the second terminal. The first control channel and the first data channel perform time division transmission.