CoMP Resource Scheduling via Preliminary Blanking Notification
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Solution Overview
Problem
Distributed coordinated scheduling in CoMP systems experiences significant scheduling delays due to iterative information exchange over the X2 interface, leading to outdated channel information and degraded transmission performance.
Innovation Solution
A method and system that allow a serving base station to determine and notify a cooperating base station about time-frequency resources to be blanked, enabling dynamic blanking with reduced iterative information exchange, thus minimizing scheduling delays and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iterative information exchange is performed between eNBs to achieve globally optimized scheduling, then scheduling optimization is improved, but scheduling delay increases significantly
Solution Approach 1:
The patent applies preliminary action by having the serving eNB determine the time-frequency resources that need to be blanked in advance, before actual data transmission. The serving eNB performs pre-scheduling assuming the cooperating eNB will blank the determined resources, and only then exchanges this determination with the cooperating eNB. This preliminary determination reduces the need for repeated iterative exchanges during actual scheduling, thereby reducing scheduling delay while maintaining optimization.
2Loss of information
If distributed scheduling is performed without exchanging large amounts of CSI via X2 interface, then information transmission overhead is reduced, but global scheduling optimization is compromised
Solution Approach 1:
The patent extracts only the essential scheduling information needed for coordination - specifically, the determination of time-frequency resources to be blanked - from the full CSI. Instead of exchanging large amounts of detailed channel state information between eNBs, the serving eNB processes the full CSI locally and extracts only the critical blanking resource determination for exchange with the cooperating eNB. This significantly reduces information transmission overhead while maintaining sufficient scheduling optimization.
3Reliability
If repeated exchanges of scheduling information are performed to achieve near-global optimization, then scheduling performance is improved, but the channel information becomes outdated due to delay
Solution Approach 1:
The patent applies preliminary action by determining the blanking resources in advance based on current channel conditions, before the actual transmission occurs. This preliminary determination captures the channel state information while it is still fresh, and the cooperating eNB executes the blanking accordingly. This approach ensures that the scheduling decisions are made based on up-to-date channel information, preventing the information from becoming outdated due to transmission delays.
Data Source
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AI summary
The embodiments of the present application relate to the technical field of wireless communications, and in particular, to a method, system and device for scheduling a resource, which are used for solving the problems that the realization of non-central coordinated scheduling using an iterative method needs to perform iterative scheduling information interaction, and scheduling time delay will obviously increase in the case of a relatively large X2 interface time delay in the prior art. The method of the embodiments of the present application comprises: a serving base station determining a time-frequency resource needing to be silenced by a cooperative base station according to channel information reported by a user equipment adopting coordinated multi-point (CoMP) transmission technology, and notifying the cooperative base station of the time-frequency resource needing to be silenced; and scheduling the user equipment according to a received notification about whether to silence the resource from the cooperative base station. The adoption of the solution of the embodiments of the present invention reduces the scheduling time delay in the case of a relatively large X2 interface time delay, and improves the efficiency of information scheduling and the system performance.