Cross-RAT Scheduling for 5G Network Adaptability
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently coordinating radio access technologies (RATs) across multiple standards, particularly in 5G networks, where conflicting requirements such as high data rates, low latency, and support for diverse applications like IoT and mission-critical communications necessitate seamless coordination between primary and secondary RATs.
Innovation Solution
The implementation of cross-RAT scheduling mechanisms, where both primary and secondary RATs can be scheduled, allowing for flexible access technology (FAT) physical channels to be transmitted within specific time intervals or delayed intervals, with optimized resource allocation and synchronization signals to enable efficient data transmission and reception across different RATs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-RAT scheduling mechanisms are implemented to support diverse applications, then network flexibility and adaptability are improved, but system complexity increases
Solution Approach 1:
The system segments RAT coordination into separate functional modules: a determination module that identifies target RATs based on application requirements, a scheduling module that allocates resources, and a transmission module that executes communication. This modular segmentation allows each component to handle specific tasks independently, improving adaptability while managing complexity through functional separation.
Solution Approach 2:
The scheduling mechanism dynamically adjusts resource allocation and RAT selection based on real-time application requirements and network conditions. The system can flexibly switch between different RATs (e.g., LTE, 5G, Wi-Fi) and adjust transmission parameters according to service demands, enabling high adaptability while maintaining manageable complexity through dynamic rather than static configuration.
2Speed
If multiple RATs are coordinated to meet high data rate requirements, then transmission speed is improved, but coordination complexity increases
Solution Approach 1:
The system performs preliminary determination of the target RAT and scheduling parameters before actual data transmission. The determination module pre-identifies which RAT(s) to use based on application requirements and network status, and pre-configures resource allocation. This preliminary action simplifies the coordination process during high-speed transmission by avoiding real-time decision-making complexity.
Solution Approach 2:
The patent introduces a centralized scheduling entity that acts as an intermediary between multiple RATs and user equipment. This mediator coordinates resource allocation, manages RAT selection, and harmonizes transmission parameters across different RATs, thereby enabling high data rates through multi-RAT coordination while containing complexity within the intermediary controller rather than分散 across the entire system.
3Measurement precision
If strict scheduling intervals are enforced for message transmission, then timing precision is improved, but network flexibility deteriorates
Solution Approach 1:
The scheduling mechanism employs dynamic timing intervals rather than fixed strict intervals. Transmission timing is adjusted based on application requirements, QoS parameters, and network conditions. For time-sensitive applications, stricter timing is enforced, while for other applications, more flexible timing is allowed, thereby maintaining timing precision where needed while preserving overall network flexibility.
Solution Approach 2:
The system changes scheduling parameters dynamically based on service requirements. Different message types and applications are assigned different timing parameters, priority levels, and scheduling weights. This parameter variability allows the system to maintain precise timing for critical communications while allowing flexibility for non-critical traffic, resolving the contradiction between timing precision and network flexibility.
Data Source
AI summary
User equipment and base stations can enable access to secondary radio access technology (S-RAT), a cross radio access technology (RAT) scheduling between a primary RAT (P-RAT) and a secondary RAT (S-RAT) and/or cross-scheduling in a same RAT with different optimizations and use/partition for different applications (e.g., a regular partition with a carrier resource (referred to as P-RAT) and an additional resource partition/region for device-to-device (D2D) or machine-type-communication (MTC) application (referred to as S-RAT)). Cross-RAT/partition-scheduling can include when S-RAT is scheduled by P-RAT or when P-RAT is scheduled by S-RAT.