Coordinated-Transmission Node Scheduling via Privilege Segmentation
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Solution Overview
Problem
In LTE-A systems, non-ideal Backhaul transmission delays lead to outdated Channel State Information (CSI) during CoMP central scheduling, negatively impacting downlink CoMP transmission performance.
Innovation Solution
A scheduling method where a Coordinated-Transmission Node receives scheduling privilege information from a Central Coordination Node (CCN) based on the latest CSI, allowing it to schedule transmissions accurately, thereby mitigating the effects of non-ideal Backhaul delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If central scheduling is performed using Backhaul for information exchange among TPs, then CoMP transmission can be achieved, but scheduling delays increase due to non-ideal Backhaul transmission delay
Solution Approach 1:
The patent segments the scheduling function into two parts: the CCN determines scheduling privileges based on latest CSI, while coordinated-transmission nodes perform actual scheduling locally. This segmentation allows the time-sensitive scheduling decision to be made locally without waiting for Backhaul communication, reducing scheduling delay while maintaining CoMP coordination benefits.
Solution Approach 2:
The CCN performs preliminary action by determining and distributing scheduling privilege information to coordinated-transmission nodes before the actual transmission occurs. This preliminary assignment of scheduling privileges enables nodes to make immediate scheduling decisions based on the latest CSI without requiring real-time Backhaul communication during the scheduling moment, thus reducing scheduling delay.
2Measurement precision
If CSI is updated frequently to maintain accuracy, then transmission performance improves, but information transmission overhead increases
Solution Approach 1:
The patent extracts only the essential scheduling privilege information from the complete CSI data at the CCN, and distributes only this extracted information to coordinated-transmission nodes. This avoids transmitting the entire CSI dataset repeatedly, reducing information overhead while maintaining the ability to make accurate scheduling decisions based on the latest channel conditions.
3Object-affected harmful factors
If CoMP coordination is implemented among multiple TPs, then interference reduction is achieved, but system complexity increases
Solution Approach 1:
The patent introduces a Central Coordination Node (CCN) as an intermediary that centralizes the complex task of determining scheduling privileges based on CSI from multiple TPs. The CCN acts as a mediator that processes information from multiple sources and distributes simplified scheduling privilege decisions to coordinated-transmission nodes, reducing the complexity burden on individual nodes while maintaining CoMP coordination benefits.
Data Source
AI summary
The present disclosure provides a scheduling method, a coordinated-transmission node and a CCN for downlink coordinated-transmission. The scheduling method at a coordinated-transmission node side includes: receiving, by a coordinated-transmission node, scheduling privilege information corresponding to a downlink time-frequency resource from a CCN, the scheduling privilege information corresponding to the downlink time-frequency resource indicating a scheduling privilege of the coordinated-transmission node over the downlink time-frequency resource; and performing, by the coordinated-transmission node, the scheduling in accordance with the received scheduling privilege information and the latest CSI reported by the terminal. According to the embodiments of the present disclosure, the CCN merely determines the scheduling privilege of each coordinated-transmission node over the downlink time-frequency resource, and each coordinated-transmission node performs the scheduling in accordance with its scheduling privilege and the latest CSI reported by the terminal that is connected to the coordinated-transmission node.