Cell-ID Sharing in LTE Cooperative Communication
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Solution Overview
Problem
In LTE systems, the overhead of system cooperation is increased due to different cell-IDs among base stations, leading to higher complexity and resource usage during handovers and air interface cooperation.
Innovation Solution
A method and apparatus for sharing cell-IDs between sites in cooperative communication by allocating synchronization sequences from a common set to multiple sites, allowing User Equipment (UE) to determine the same cell-ID and distinguishing sites through antenna unit IDs, thereby reducing system overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different base stations are distinguished by different cell-IDs, then each base station can be independently identified and managed, but the system overhead increases and handover complexity increases
Solution Approach 1:
The patent segments the cell-ID identification function into two parts: a shared cell-ID for the cooperative group (reducing overhead) and a site-specific identifier (physical site ID or antenna unit ID) for distinguishing individual base stations (maintaining identification capability). This segmentation allows the system to maintain base station distinguishability while reducing the overhead associated with unique cell-IDs for each station.
Solution Approach 2:
The patent merges the identification functions of multiple base stations by assigning them a common cell-ID at the group level. This merging reduces the number of unique cell-IDs needed in the system, thereby reducing system overhead and simplifying handover procedures, while the physical site ID or antenna unit ID provides the necessary differentiation.
2Reliability
If each cell has an independent Cell-ID, then channels and scrambling sequences are independent, but handover processes require high layer updates and increase complexity
Solution Approach 1:
The patent segments the channel independence requirement from the cell-ID uniqueness requirement. By using a shared cell-ID for the cooperative group, the system reduces handover complexity, while maintaining channel independence through site-specific parameters such as physical site ID or antenna unit ID that differentiate the channels of individual base stations.
3Adaptability or versatility
If Cell-IDs of cells are different during air interface cooperation, then each cell can be independently managed, but the system cooperation overhead is larger
Solution Approach 1:
The patent merges the cell-ID assignment at the cooperative group level, assigning a common cell-ID to all base stations participating in air interface cooperation. This merging significantly reduces the cooperation overhead by eliminating the need for unique cell-IDs for each participating base station, while the physical site ID or antenna unit ID maintains the necessary management flexibility.
Data Source
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AI summary
The present invention provides a method and an apparatus for sharing a cell-ID between sites and determining a cell-ID of a site in cooperative communication. The method includes: obtaining a synchronization sequence set, where the synchronization sequence set is used to determine a cell-ID (Cell-ID); and allocating synchronization sequences in the same synchronization sequence set to multiple sites, where the synchronization sequences in the same synchronization sequence set are used to determine antenna unit IDs (AU-ID) of respective sites. Through the embodiments of the present invention, a system overhead may be decreased.