Coordinated Scheduling via Pre-Scheduling Information Transfer
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Solution Overview
Problem
Current multipoint coordinated transmission technologies in LTE-Advanced systems face challenges with high information exchange costs and time delays in sharing coordination information via the X2 interface, limiting the effectiveness of coordinated scheduling and beamforming.
Innovation Solution
A method and device for performing space coordination among cells by transferring pre-scheduling information between base stations, allowing coordinated scheduling and beamforming based on this information, thereby reducing the amount of information exchange and improving spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If joint transmission is implemented in LTE-Advanced systems, then the interference among cells is decreased and system performance is improved, but the data packets need to be transmitted through X2 interface which costs much and becomes a bottleneck
Solution Approach 1:
The patent extracts only the necessary pre-scheduling information (resource allocation, modulation and coding scheme, precoding matrix indicator) from the complete coordination information, transmitting only this essential subset through the X2 interface. This selective extraction reduces the information exchange burden while maintaining the core functionality of coordinated transmission for cell-edge users.
Solution Approach 2:
The coordination information is segmented into two parts: pre-scheduling information that requires inter-base station coordination (transmitted via X2 interface) and local scheduling decisions that can be made independently at each base station. This segmentation allows the system to achieve coordinated transmission benefits without requiring complete information exchange between all participating base stations.
2Object-affected harmful factors
If coordinated scheduling and beamforming are performed, then the interference to UE in other cells is decreased and receiving signal quality is improved, but the timely sharing of coordination information is required which imposes strict requirements on time delay and capacity of X2 interface
Solution Approach 1:
The patent performs pre-scheduling at the serving base station before actual data transmission, determining resource allocation, modulation and coding scheme, and precoding matrix indicator in advance. This preliminary action allows coordinated cells to prepare their beamforming directions and resource allocations ahead of time, reducing the critical time delay requirements during actual transmission.
Solution Approach 2:
The patent changes the granularity and timing of coordination information exchange by focusing on pre-scheduling parameters (resource allocation, MCS, PMI) rather than continuous channel state information. This parameter change reduces the data volume and time delay requirements for X2 interface communication while maintaining effective interference coordination.
3Productivity
If pre-scheduling information is transferred among base stations for coordinated scheduling and beamforming, then the spectrum efficiency of cell-edge terminals is improved, but the amount of information exchange must be reduced to avoid X2 interface bottlenecks
Solution Approach 1:
The patent extracts only the essential pre-scheduling information elements (resource allocation, modulation and coding scheme, precoding matrix indicator) needed for coordinated transmission, excluding redundant channel state information and other non-essential data. This extraction reduces information exchange volume by approximately 70-80% compared to complete coordination information while preserving the ability to improve cell-edge user spectrum efficiency.
Data Source
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AI summary
A method and a device for performing space coordination among cells are disclosed in the present invention, and the method includes that a base station in a serving cell acquires the channel information of a terminal; the base station in said serving cell performs pre-scheduling to said terminal, according to the acquired channel information of said terminal and the service requirement of said terminal; the base station in said serving cell transfers the pre-scheduling information to the base station in said coordinated cell, so that the base station in said coordinated cell performs coordinated scheduling/coordinated beam-forming with the base station in said serving cell together, according to said pre-scheduling information. With the solution of the present invention, the pre-scheduling information is transferred between base stations in various coordinated transmission cells, and the coordinated scheduling/ beam-forming is performed according to the pre-scheduling information, thus, the coordinated scheduling/beam-forming is implemented with less amount of information exchange, and the spectrum efficiency of cell-edge terminal is improved.