Base Station Uplink Scheduling with Variable Transmission Time Intervals
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Solution Overview
Problem
Current 4G and 4.5G mobile communication technologies face challenges in meeting the diverse time delay requirements of 5G services, such as eMBB, URLLC, and mMTC, due to fixed and large-time delay scheduling, which is inadequate for the varied latency needs of these services.
Innovation Solution
An uplink transmission method that adjusts the scheduling time delay by determining a time length of a single transmission time interval (t) and a time delay correction value (k) based on the service type, allowing for flexible scheduling through UL grant signaling, enabling terminals to transmit uplink data according to specific time intervals and delay corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed transmission time interval of 1ms is used for uplink scheduling, then the system maintains simplicity and compatibility with existing LTE technology, but the scheduling time delay cannot meet the diversified time delay requirements of 5G services
Solution Approach 1:
The patent applies dynamics by making the transmission time interval variable rather than fixed. The base station determines different TTI lengths (t) based on service types, allowing the scheduling mechanism to adapt dynamically between short TTI (e.g., 0.5ms for URLLC) and long TTI (e.g., 1ms or 2ms for eMBB/mMTC), thereby resolving the contradiction between adaptability and complexity
Solution Approach 2:
The patent changes the parameter of transmission time interval length according to different service types. By introducing a service-type-dependent TTI parameter that can take different values (short, medium, long), the system achieves diversified time delay requirements without requiring fundamentally different scheduling mechanisms for each service type
2Reliability
If the uplink scheduling time delay is set to 4ms or more to ensure reliable data transmission, then transmission reliability is improved, but the time delay requirement of 0.5ms for URLLC service cannot be met
Solution Approach 1:
The patent applies local quality by providing different scheduling time delays for different service types rather than using a uniform delay. URLLC services receive short TTI with minimal delay (meeting 0.5ms requirement), while eMBB and mMTC services use longer TTIs with 4ms or more delay, ensuring each service type receives the appropriate quality of service
Solution Approach 2:
The patent segments the uplink scheduling mechanism into different service-specific scheduling paths. By dividing the scheduling process into service-type-specific branches (URLLC scheduling, eMBB scheduling, mMTC scheduling), each with appropriate TTI lengths, the system can simultaneously achieve low delay for URLLC and high reliability for other services
Data Source
AI summary
An uplink transmission method and a base station are provided The method includes: determining, by the base station, a time length of a single transmission time interval t and a time delay correction value k corresponding to a service type; sending uplink grant signaling to a terminal, and indicating uplink transmission information of uplink data in the uplink grant signaling; informing the terminal of duration information of the single transmission time interval t, information of the time delay correction value k and the uplink transmission information; receiving the uplink data transmitted by the terminal according to the duration information of the single transmission time interval t, the information of the time delay correction value k and the uplink transmission information, to implement an uplink transmission. The technical solution is beneficial for the base station to adjust the uplink scheduling delay, to satisfy the diversified requirements in the future 5G services.