MBSFN Subframe Configuration Exchange via X2 Interface
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Solution Overview
Problem
In current LTE systems, eNBs fail to obtain MBSFN subframe configurations from neighboring cells, leading to interference and reduced system capacity and service quality due to differing subframe configurations.
Innovation Solution
A method and apparatus for notifying MBSFN subframe configurations through an X2 interface, where nodes send and receive subframe configurations, compare them, and set system information or RRC connection reconfiguration accordingly, enabling rational resource utilization and reducing cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If eNBs use different MBSFN subframe configurations to meet varying coverage requirements, then adaptability is improved, but interference between neighboring cells increases and system capacity deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where eNBs exchange MBSFN subframe configuration information through the X2 interface. Each eNB sends its configured MBSFN subframe settings to neighboring eNBs, which then provide feedback when detecting conflicts. This feedback loop enables dynamic adjustment of configurations to eliminate interference while preserving adaptability to different coverage requirements.
Solution Approach 2:
The X2 interface serves as an intermediary mechanism between neighboring eNBs, facilitating the exchange of MBSFN subframe configuration information. This intermediary communication channel enables coordinated configuration management, allowing eNBs to negotiate and synchronize their settings to avoid interference while maintaining individual adaptability.
2Adaptability or versatility
If eNBs use different MBSFN subframe configurations, then adaptability is improved, but measurement accuracy for cells deteriorates
Solution Approach 1:
The patent applies preliminary action by having eNBs proactively send their MBSFN subframe configuration information to neighboring eNBs before measurements are performed. This advance notification allows receiving eNBs to prepare appropriate measurement configurations, ensuring accurate measurements even when configuration differences exist between neighboring cells.
3Productivity
If eNBs exchange MBSFN subframe configuration information through X2 interface, then interference is reduced and system capacity is improved, but device complexity increases
Solution Approach 1:
The patent leverages the existing X2 interface, which is a standard LTE interface already present between eNBs for other purposes. By reusing this existing communication infrastructure for MBSFN configuration exchange, the patent avoids adding new hardware or communication protocols, thereby minimizing the increase in device complexity while achieving interference reduction and capacity improvement.
Data Source
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AI summary
The present invention provides a method for notifying Multicast Broadcast Single Frequency Network (MBSFN) subframe configuration, which comprises the following steps: a first node sends its MBSFN subframe configuration, via an X2 interface, to a second node with which the first node is connected; the first node receives the MBSFN subframe configuration of the second node as a feedback. According to the invention, a serving cell can obtain the MBSFN subframe configurations of the neighboring cells and/or RNs, so that rational utilization of resources is achieved according to the configurations. Therefore, interference between cells is reduced, and system capacity and efficiency are improved.