Sidelink Bandwidth Part Configuration for Low-Latency 5G URLLC
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Solution Overview
Problem
The legacy LTE D2D and V2X sidelink communication systems suffer from high latency and unreliable channel conditions, which cannot meet the requirements of 5G URLLC services due to the two-step transmission of sidelink scheduling information and unreliable PSCCH forwarding.
Innovation Solution
A method and apparatus for sidelink information transmission that configures UEs with dedicated bandwidth parts (BWPs) for sidelink reception and transmission, allowing direct configuration by the base station to reduce latency and improve reliability, including scenarios where BWPs are associated with UL or DL BWPs on the same carrier or TDD carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sidelink scheduling information is transmitted in two steps (base station to transmit UE, then transmit UE to receive UE), then the legacy LTE D2D and V2X systems can maintain backward compatibility, but the transmission latency increases substantially
Solution Approach 1:
The patent extracts the scheduling information transmission function from the two-step process and implements it directly at the base station to receive UE, eliminating the intermediate relay step through transmit UE while maintaining backward compatibility with legacy systems
Solution Approach 2:
The patent segments the scheduling information into different types (first sidelink scheduling information for resource allocation, second sidelink scheduling information for other control functions) and transmits them through different paths to optimize latency for different functions
2Reliability
If PSCCH is used to forward scheduling information between UEs, then the legacy system can operate with existing channel structures, but the channel reliability becomes poor under bad channel conditions
Solution Approach 1:
The patent introduces the base station as an intermediary node that directly transmits scheduling information to the receive UE, replacing the unreliable UE-to-UE PSCCH forwarding path while maintaining compatibility with existing PSCCH structures for other functions
Solution Approach 2:
The patent changes the transmission parameters by using different physical channels (direct downlink transmission vs. uplink sidelink transmission) and adjusts modulation and coding schemes based on channel conditions to improve reliability
3Productivity
If dedicated bandwidth parts are configured for sidelink reception and transmission, then frequency resource allocation efficiency improves, but the device complexity increases due to BWP configuration management
Solution Approach 1:
The patent configures dedicated bandwidth parts that can serve multiple functions - sidelink reception, sidelink transmission, and association with UL/DL BWPs - allowing a single BWP configuration mechanism to handle diverse frequency resource allocation needs
Solution Approach 2:
The base station performs preliminary BWP configuration before sidelink communication begins, pre-establishing the frequency resources and associations to avoid complex real-time negotiation and switching during active communication
Data Source
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AI summary
A method and apparatus for sidelink information transmission, and a terminal device and a network device. In the method, a first UE (user equipment) receives first configuration information from a base station, wherein the first configuration information is to configure the first UE with at least one first bandwidth part (BWP) for sidelink reception; and the UE receives sidelink information from a second UE on the first BWP.