Femto Base Station System Information Reception Using Unique IDs
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Solution Overview
Problem
In broadband wireless communication systems, existing methods for a user equipment (UE) to receive System Information (SI) from a femto base station are inefficient, particularly in shadow regions, as they require lengthy measurement gaps or complex signaling exchanges, which can cause delays during handovers and are not suitable for real-time services like VoIP.
Innovation Solution
The method involves determining an SI transmission point using unique identification information of both the femto and macro base stations, allowing for the generation and transmission of a measurement gap pattern without separate signaling exchanges, enabling SI reception without additional delays and supporting high-QoS services like VoIP during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a conventional measurement gap pattern is used for SI reception, then SI can be received from femto base station, but the measurement gap duration is too long causing service interruption for real-time services like VoIP
Solution Approach 1:
The macro base station pre-configures measurement gap patterns and provides them to the UE in advance through system information or dedicated signaling. This allows the UE to have measurement gaps pre-arranged without requiring lengthy real-time signaling exchanges when handover is needed, thus reducing service interruption time while ensuring SI reception capability
2Loss of information
If separate signaling exchange is performed to obtain measurement gap pattern, then UE can receive SI, but signaling complexity increases and additional delays occur during handover
Solution Approach 1:
The measurement gap pattern configuration is extracted from the complex handover signaling process and provided independently in advance through system information blocks or dedicated RRC signaling. This separates the measurement gap acquisition from the handover execution, reducing signaling complexity and eliminating additional delays during actual handover operations
3Adaptability or versatility
If PCID is reused in multiple femto cells within one macro cell area, then femto cell deployment flexibility increases, but macro cell cannot identify specific femto cell using only PCID
Solution Approach 1:
The system transitions from single-dimension PCID identification to multi-dimensional identification by combining PCID with GCID. The PCID maintains reuse for deployment flexibility while the GCID provides unique global identification, creating a two-layer identification structure that resolves the conflict between flexibility and identifiability
Data Source
AI summary
A method and an apparatus for transmitting and receiving System Information (SI) of a femto base station in a wireless communication system are provided. In the method, an SI transmission point is determined using unique identification information of a femto base station itself and unique identification information of a macro base station with which the femto base station is associated. Each of user equipment and the macro base station generate a measurement gap pattern representing an SI reception point using the unique identification information of the femto base station and the unique identification information of the macro base station. SI is received from the femto base station according to the generated measurement gap pattern.