Scheduling Request Resource Selection for Mixed TTI Traffic
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Solution Overview
Problem
In 5G wireless communication systems, efficiently allocating radio resources between eMBB and URLLC traffic with different latency requirements is challenging, particularly when radio frame configurations with varying TTI lengths coexist, as it is essential to prevent degradation of low-latency URLLC traffic due to allocation of resources for eMBB traffic.
Innovation Solution
User equipment that acquires and selects appropriate UL resources with different TTI lengths to transmit scheduling requests to the base station, allowing for dynamic allocation of radio resources based on traffic requirements, using SR resources configured within the TTI frame to request either normal or short TTI allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio resources are shared between eMBB and URLLC traffic in the same carrier, then system capacity and resource utilization are improved, but the quality of URLLC traffic may be deteriorated due to allocation of resources for eMBB traffic
Solution Approach 1:
The patent segments UL resources into multiple types (first type for normal TTI, second type for short TTI) with different timing characteristics. This segmentation allows the system to allocate appropriate resource types based on traffic requirements, ensuring URLLC traffic can use short TTI resources for low latency while eMBB traffic uses normal TTI resources, thus preventing URLLC quality deterioration while maintaining high system capacity through efficient resource utilization
Solution Approach 2:
The patent implements dynamic resource allocation by allowing flexible switching between different UL resource types based on real-time traffic conditions. The base station can dynamically allocate short TTI resources for URLLC when low latency is required, and normal TTI resources for eMBB when throughput is prioritized, enabling the system to adapt to varying traffic demands and maintain both high capacity and reliable URLLC service
2Loss of time
If a radio frame configuration with shorter TTI length is used for URLLC, then ultra-low latency is achieved, but it becomes necessary to provide a complex mechanism for allocating radio resources at appropriate timing for each traffic type
Solution Approach 1:
The patent simplifies the allocation mechanism by segmenting UL resources into distinct types (first type with normal TTI timing, second type with short TTI timing). This segmentation provides a clear, rule-based allocation approach where the base station assigns specific resource types based on traffic type, avoiding the need for complex dynamic scheduling decisions while achieving ultra-low latency for URLLC through dedicated short TTI resource allocation
3Ease of operation
If multiple UL resources are allocated for scheduling requests in a TTI with predetermined length, then the ability to transmit scheduling requests at appropriate timing is improved, but the device complexity for managing and selecting resources increases
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different UL resources within the same TTI. Specifically, first UL resources are configured for normal TTI timing while second UL resources are configured for short TTI timing. This allows the UE to select the appropriate resource type based on the specific scheduling request requirements, improving ease of operation for different traffic types while the base station manages the resources through clear type-based configuration rather than complex individual resource management
Data Source
AI summary
There is provided user equipment of a radio communication system that supports TTIs having a plurality of lengths and that includes a base station and the user equipment, the user equipment including an acquisition unit configured to acquire, from the base station, information indicating a plurality of UL resources which are allocated to a plurality of symbols included in a TTI having a predetermined length and with which a scheduling request can be transmitted; and a transmission unit configured to select a UL resource from the plurality of UL resources and transmit the scheduling request to the base station with the selected UL resource.