Sidelink Packet Duplication Scheduling Across Carriers for V2X Reliability
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Solution Overview
Problem
Conventional wireless communications systems do not adequately support network-assisted scheduling for packet duplication in vehicle-based sidelink communications, particularly in semi-persistent scheduling (SPS), which is necessary for reliable V2X packet delivery.
Innovation Solution
A mechanism is introduced for efficient signaling between a base station and a user equipment (UE) to determine and allocate sufficient resources for vehicle-based sidelink communications using carrier aggregation (CA) based packet duplication, where the UE requests resources by providing traffic profile and reliability metrics, and the base station responds with SPS grants on designated carrier frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signaling designs are used for network-assisted scheduling, then the base station and UE can exchange basic scheduling information, but sufficient information cannot be exchanged for the network to schedule enough resources for sidelink communication grants
Solution Approach 1:
The assistance information is segmented into multiple components including traffic pattern information, reliability metric, and carrier frequency identifiers. This segmentation allows comprehensive information to be transmitted in an organized manner, enabling the base station to make informed scheduling decisions for packet duplication across multiple carriers.
Solution Approach 2:
The patent extends the signaling dimension by introducing new information elements (traffic profile, reliability metrics, carrier frequency sets) beyond conventional scheduling requests. This dimensional expansion enables the base station to understand the full context of V2X communication requirements and allocate resources accordingly across multiple carriers for packet duplication.
2Reliability
If packet duplication is implemented using multiple carriers, then the reliability of V2X packet delivery is improved, but the complexity of resource scheduling and signaling increases
Solution Approach 1:
The UE provides assistance information in advance that includes traffic patterns, reliability requirements, and suitable carrier frequency sets. This preliminary action allows the base station to pre-configure packet duplication across multiple carriers before actual data transmission, reducing real-time scheduling complexity while maintaining high reliability.
Solution Approach 2:
The UE autonomously identifies suitable carrier frequencies and traffic patterns, then reports this information to the base station. This self-service approach reduces the base station's computational burden in carrier selection and scheduling, simplifying the overall system complexity while enabling reliable multi-carrier packet duplication.
3Reliability
If semi-persistent scheduling is used with packet duplication, then sufficient resources can be allocated for reliable V2X communication, but the conventional SPS assistance information report is insufficient
Solution Approach 1:
The patent enhances the SPS assistance information report by adding new parameters including traffic pattern identifiers, reliability metrics, and carrier frequency set identifiers. These parameter changes make the assistance information adaptable to different V2X service requirements, enabling the base station to configure appropriate packet duplication strategies across multiple carriers for varying traffic conditions.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine that a profile for vehicle-based sidelink communications supports packet duplication using a set of carrier frequencies. The UE may transmit a request to a base station for resources to use to perform the vehicle-based sidelink communications, the request comprising an indication of the profile, a reliability metric associated with the profile, and an identifier that identifies the set of carrier frequencies. The UE may receive one or more grants from the base station for semi-persistent scheduling resources allocated on the set of carrier frequencies in response to the request.