CoMP Resource Scheduling via Pre-negotiated Precoding Constraints
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Solution Overview
Problem
Centralized coordinated scheduling in CoMP transmission experiences significant scheduling delays and performance losses due to excessive information exchange over non-ideal X2 interfaces, while distributed coordinated scheduling faces challenges with outdated channel information and high delays from repeated exchanges.
Innovation Solution
A method where serving and cooperating base stations pre-negotiate to determine prohibited pre-coding matrixes, reducing the need for frequent information exchange by determining and agreeing on pre-coding matrixes that can be used or prohibited, thereby optimizing resource scheduling without constant X2 interface communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized coordinated scheduling is used in CoMP transmission, then coordination between multiple base stations is achieved, but significant scheduling delays and performance losses occur due to excessive information exchange over non-ideal X2 interfaces
Solution Approach 1:
The patent extracts and removes the prohibited pre-coding matrices from the cooperating base station's options through pre-negotiation. By identifying and eliminating harmful pre-coding matrices in advance, the system reduces the information exchange burden during actual scheduling while maintaining effective coordination. This extraction approach allows the serving base station to prohibit specific pre-coding matrices at the cooperating base station without requiring continuous information exchange.
Solution Approach 2:
The patent applies preliminary action by performing pre-negotiation between serving and cooperating base stations before actual resource scheduling. The serving base station determines prohibited pre-coding matrices in advance and communicates them to the cooperating base station. This preliminary determination and communication of prohibited matrices reduces the information exchange required during time-critical scheduling operations, thereby reducing scheduling delays while maintaining coordination effectiveness.
2Loss of time
If distributed coordinated scheduling is used, then information exchange is reduced, but outdated channel information and high delays occur from repeated exchanges
Solution Approach 1:
The patent implements feedback mechanisms where the serving base station determines prohibited pre-coding matrices based on channel state information and feeds this information back to the cooperating base station. The cooperating base station uses this feedback to adjust its pre-coding matrix selections, ensuring that channel information remains accurate without requiring repeated extensive information exchanges. This feedback loop maintains information accuracy while reducing exchange frequency and delay.
3Measurement precision
If frequent information exchange is performed between base stations, then scheduling accuracy is maintained, but transmission delays increase due to X2 interface limitations
Solution Approach 1:
The patent extracts the essential scheduling information by identifying and communicating only the prohibited pre-coding matrices from the complete set of possible matrices. This extraction approach maintains scheduling accuracy by prohibiting harmful matrices while avoiding the need to exchange complete channel state information frequently. The serving base station determines the prohibited set based on channel conditions and communicates this condensed information to the cooperating base station, reducing transmission delay while preserving scheduling precision.
Solution Approach 2:
The patent changes the parameter being exchanged from complete channel state information to a simplified representation (prohibited pre-coding matrix indicators). This parameter transformation maintains the essential scheduling accuracy information in a compressed form that requires less transmission time over the X2 interface, thereby reducing transmission delays while preserving scheduling precision.
Data Source
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AI summary
The embodiments of the present application disclose a method and a device for scheduling a resource in coordinated multi-point transmission and relate to the field of the wireless communications, so as to reduce the delay of a non-center coordination scheduling solution under the coordinated multi-point CoMP transmission and improve the scheduling efficiency. The solution comprises: a serving base station determining, according to a preset result of a negotiation with a coordinated base station, a final precoding matrix the coordinated base station prohibits; scheduling a resource according to channel state information (CSI) reported by a user terminal and the final precoding matrix the coordinated base station prohibits, and the coordinated base station scheduling the resource according to the CSI reported by the user terminal and the final precoding matrix the coordinated base station prohibits. By using the solution, the efficiency of the resource scheduling can be improved.