Cell Identifier Encoding Using Spreading Codes for Base Station Selection
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Solution Overview
Problem
In wireless communication networks, determining the base station with the highest Signal-to-Interference plus Noise Ratio (SINR) is prone to errors due to strong signals from multiple base stations, leading to inaccuracies in base station selection processes.
Innovation Solution
The method involves encoding Cell Identifiers using Orthogonal Frequency Division Multiplexing (OFDM) and applying cell-specific spreading codes to downlink frames, allowing user equipment to despread and identify the strongest signal, thereby determining the appropriate base station for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system determines base station selection based on SINR in the presence of strong signals from multiple base stations, then base station selection can be made, but errors in selection increase
Solution Approach 1:
The patent segments the cell identifier into multiple parts and uses different spreading codes for different segments. This segmentation allows the receiving device to separately process and identify signals from different base stations, reducing interference and improving measurement accuracy in multi-base station environments.
Solution Approach 2:
The patent introduces spreading codes as an intermediary mechanism between the cell identifier and the transmitted signal. These spreading codes enable the receiving device to distinguish and despread signals from different base stations, facilitating accurate SINR measurement and base station identification even when multiple strong signals are present.
2Measurement precision
If cell identifiers are transmitted without spreading codes, then transmission simplicity is maintained, but base station identification accuracy decreases in multi-base station environments
Solution Approach 1:
The patent applies spreading codes to cell identifiers in advance at the transmitting base station before transmission. This preliminary encoding action ensures that the receiving device can later accurately identify and despread the correct cell identifier from multiple simultaneous transmissions, improving identification accuracy without requiring complex real-time processing.
Solution Approach 2:
The patent changes the parameter of cell identifier representation by applying different spreading codes to different parts of the cell identifier. This parameter transformation enables the receiving device to use correlation-based detection to accurately identify the transmitted cell identifier even in the presence of multiple strong signals from different base stations.
Data Source
AI summary
In an embodiment, a wireless communication system (100, FIG. 1) includes one or more nodes (102-108) and one or more user equipments (UE) (110). A node may apply (502, FIG. 5) a cell-specific spreading code to a cell identifier, which indicates an identity of a cell (113, FIG. 1) serviced by the node. The node may insert (504, FIG. 5), into a frame (200, FIG. 2), at least one synchronization channel symbol, which corresponds to the spread cell identifier, and the node may transmit (506, FIG. 5) the frame over an air interface. A UE may receive (702, FIG. 7) a frame from the air interface. The UE may despread (708) the spread cell identifier, and acquire (712) a cell identifier corresponding to a particular cell.