Terrestrial-Assisted Scheduling for Non-Terrestrial Dual Connectivity
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Solution Overview
Problem
The scheduling delay in non-terrestrial cells of future mobile communication systems is significant due to differences in time delay and mechanisms between non-terrestrial and terrestrial cells, especially when integrated with dual connectivity.
Innovation Solution
Utilizing terrestrial cells to assist in the scheduling of non-terrestrial cells by sharing SR resources, BSR processes, and preconfigured grant assistance information, and coordinating uplink and downlink scheduling through identification and indication mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each MAC entity independently performs scheduling of the logical channel corresponding to the MAC entity, then the scheduling mechanism maintains independence and simplicity for each cell type, but the scheduling delay of the non-terrestrial cell becomes very large
Solution Approach 1:
The patent merges the scheduling functions of terrestrial and non-terrestrial cells by having the terrestrial cell's MAC entity perform scheduling for both cells. Specifically, the terminal sends SR/BSR information for the non-terrestrial cell through the terrestrial cell, and the terrestrial cell's base station performs unified scheduling, thereby reducing scheduling delay while maintaining reliable resource allocation.
Solution Approach 2:
The terrestrial cell acts as an intermediary to facilitate scheduling for the non-terrestrial cell. The terrestrial cell's MAC entity receives SR/BSR information from the terminal and uses this information to perform scheduling for both terrestrial and non-terrestrial cells, effectively mediating the scheduling process to reduce delay.
2Device complexity
If SR resources for terrestrial cell and non-terrestrial cell are completely separated, then resource allocation is simple and clear, but scheduling efficiency and responsiveness are reduced
Solution Approach 1:
The patent makes the terrestrial cell's MAC entity universal by enabling it to perform scheduling functions for both terrestrial and non-terrestrial cells. The same MAC entity and SR resources are used to handle scheduling for both cell types, improving scheduling efficiency without significantly increasing complexity.
Solution Approach 2:
The patent combines the SR resource usage of terrestrial and non-terrestrial cells. The terminal sends SR information for the non-terrestrial cell through the terrestrial cell's SR resources, and the base station uses these combined resources to perform unified scheduling, thereby improving scheduling efficiency while keeping the resource allocation mechanism relatively simple.
3Device complexity
If identical LCID and LCG ID are used under MCG and SCG, then configuration is simplified and consistent, but scheduling distinction and identification become difficult
Solution Approach 1:
The terrestrial cell's MAC entity acts as an intermediary that receives SR/BSR information and performs unified scheduling. By using the terrestrial cell as the intermediary processing point, the system can maintain simple configuration with identical LCID/LCG ID while the intermediary handles the distinction and identification during the scheduling process.
Data Source
AI summary
A scheduling method, a scheduling device and a readable storage medium are provided, related to the communication technologies. The method includes: in a case that the terminal simultaneously aggregates a non-terrestrial cell and a terrestrial cell, using the terrestrial cell to assist a scheduling of the non-terrestrial cell.