Carrier Resource Scheduling for Mixed TTI Traffic
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in supporting transmissions of varying transmission time intervals (TTIs) with different lengths within a single carrier, particularly in meeting the requirements of high-speed eMBB and low-latency URLLC traffic simultaneously.
Innovation Solution
A scheduling method and apparatus that reserve a first resource region for a first TTI-based transmission within a second TTI interval, allowing for the scheduling of both first and second data channels on distinct resource regions within the carrier, with information about these regions transmitted through control channels using physical and higher-layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single TTI length is used for all transmissions within a carrier, then the system structure remains simple and resource allocation is straightforward, but the system cannot simultaneously support both high-speed eMBB traffic requiring long TTI and low-latency URLLC traffic requiring short TTI
Solution Approach 1:
The patent segments the carrier bandwidth into multiple resource pools, each configured with a specific TTI length. This allows different resource pools to be allocated to different traffic types (eMBB with long TTI, URLLC with short TTI) independently, enabling the system to support multiple traffic requirements simultaneously while maintaining manageable scheduling complexity through structured resource division
Solution Approach 2:
The patent introduces a new dimension of resource allocation by configuring multiple resource pools with different TTI lengths within the same carrier. Instead of using a single TTI length for all transmissions, the system creates a multi-dimensional resource space where each pool can be independently scheduled according to its specific TTI requirements, thus resolving the contradiction between adaptability and complexity
2Productivity
If multiple resource pools with different TTI lengths are configured within one carrier, then the system can support diverse traffic requirements, but the resource allocation and scheduling complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple resource pools with specific TTI lengths before actual data transmission. The base station and terminal establish the resource pool configurations, including TTI lengths and resource allocations, in advance through RRC signaling. This pre-configuration reduces real-time scheduling complexity while maintaining high productivity in supporting diverse traffic types
Solution Approach 2:
The patent utilizes parameter changes by configuring different TTI lengths as a key parameter for different resource pools. The system dynamically selects appropriate resource pools based on traffic requirements by changing the TTI length parameter, enabling efficient support for both long TTI (eMBB) and short TTI (URLLC) traffic while managing scheduling complexity through parameter-based resource selection
3Loss of time
If resource regions for different TTI lengths are allocated within the same carrier, then transmission latency is reduced for short TTI traffic, but resource interference and allocation conflicts may occur
Solution Approach 1:
The patent segments the time-frequency resources into separate pools, each dedicated to a specific TTI length. This segmentation prevents resource interference between different TTI lengths by ensuring that short TTI and long TTI transmissions occur in distinct resource regions, thereby maintaining allocation reliability while achieving low latency for short TTI traffic
Solution Approach 2:
The patent introduces control signaling as an intermediary mechanism to manage resource pool allocations and prevent conflicts. The base station uses PDCCH to schedule transmissions in appropriate resource pools based on traffic requirements, and RRC signaling to configure pool parameters, ensuring reliable resource allocation without interference while maintaining low latency performance
Data Source
AI summary
Within one carrier, a base station reserves a first resource area for a first TTI-based transmission in a unit of first TTI within a second TTI period longer than the first TTI, and schedules a first data channel to be transmitted on the basis of the first TTI, in the first resource area.