Femto Base Station CSG ID Indication for Access Delay Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, terminals face challenges in determining whether a Femto base station has a CSG ID and its type, leading to access delays and inefficient maintenance of base station information.
Innovation Solution
The method involves the base station notifying the terminal of its CSG ID and type using synchronization sequences, cell identifiers, carrier frequencies, or control signaling, establishing a correspondence relationship to facilitate the terminal's judgment on access permissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal maintains a list based on BS_ID information for hundreds of Femto BSs, then the terminal can identify individual base stations, but the terminal storing resources are heavily occupied and real-time updates according to locations become difficult
Solution Approach 1:
Multiple Femto BSs share one CSG ID, merging the identification function from individual BS_ID level to group CSG ID level. This reduces the number of identifiers the terminal must store and manage, directly addressing the storage resource occupation problem while maintaining adequate identification capability through group-based classification
Solution Approach 2:
The CSG ID serves multiple functions: it identifies the base station group, determines access permissions, and enables location-based filtering. This multi-functionality replaces the need for maintaining separate detailed BS_ID information for each base station, reducing terminal storage requirements while preserving necessary identification and access control capabilities
2Ease of operation
If the terminal uses BS_ID information to identify Femto BSs, then individual base station access can be controlled, but the terminal cannot efficiently judge access permissions when hundreds of Femto BSs are present
Solution Approach 1:
The system segments base stations into groups based on CSG ID, allowing the terminal to perform access permission judgments at the group level rather than evaluating each individual BS_ID. This segmentation reduces the computational complexity of access control decisions when dealing with hundreds of base stations
Solution Approach 2:
The terminal pre-filters base stations using CSG ID information before attempting detailed access checks. By performing preliminary grouping and filtering based on CSG ID, the terminal reduces the number of base stations that require detailed BS_ID verification, streamlining the overall access permission judgment process
3Adaptability or versatility
If the terminal does not know the BS type and CSG ID status, then the system maintains simplicity, but the terminal cannot judge whether the Femto BS can provide services
Solution Approach 1:
The base station performs preliminary indication of its type and CSG ID status through synchronization sequences and system information before the terminal attempts to access it. This advance information provision enables the terminal to make informed decisions about service availability without requiring complex terminal-side detection mechanisms
Solution Approach 2:
Synchronization sequences and system information messages serve as intermediaries that convey base station type and CSG ID status information from the base station to the terminal. These intermediary signals carry the necessary information without requiring direct complex interaction between terminal and base station, enabling service capability judgment while maintaining system simplicity
Data Source
AI summary
There are provided a method for indicating a CSG ID, a method for indicating a base station type and a method for obtaining CSG ID indication. The method for indicating the CSG ID includes: a base station notifying a terminal of whether the base station has a CSG ID. The present solution solves the problem of access delay in the related art resulted from that the terminal cannot obtain the specific base station type and whether the base station has a CSG ID, ensures the easy operation of the accessed base station information needing to be maintained by the terminal, and thus improves the quality of service of the whole system for the terminal.