Cell-Selective Network Access via Preamble Signaling
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Solution Overview
Problem
Existing wireless network technologies do not effectively allow terminal devices to selectively access different cell types based on preferences, such as femto cells and macro cells, to enjoy benefits like pricing advantages and high data rates.
Innovation Solution
The method involves differentiating cell types by unique preamble or header signals, allowing terminal devices to identify and selectively access the desired cell type by detecting predetermined cell type-specific preamble or header patterns, such as specific modulation series, flags, or repetition patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal devices access the network using conventional methods, then they can connect to the network, but they cannot selectively access different cell types (femto cell vs. macro cell) based on their preferences
Solution Approach 1:
The invention applies preliminary action by pre-configuring distinct preamble sequences and header structures for different cell types (femto and macro cells) before the terminal device attempts to access the network. The terminal device is pre-programmed with knowledge of these differentiated signal structures, enabling it to proactively identify and select its preferred cell type during the initial scanning phase, rather than attempting access first and determining cell type later.
Solution Approach 2:
The invention implements local quality by introducing cell-type-specific characteristics into specific portions of the broadcast signal - namely the preamble and header sections. Different cell types transmit identical functional information but encode it with unique local identifiers (specific preamble sequences, distinct header formats, or differentiated repetition patterns). This allows terminal devices to differentiate cell types by examining only these localized signal portions without needing to decode the entire broadcast message.
2Productivity
If terminal devices can identify and selectively access desired cell types, then they can enjoy pricing benefits and high data rates, but the network infrastructure becomes more complex
Solution Approach 1:
The invention applies segmentation by dividing the broadcast signal into distinct functional segments with differentiated characteristics. The preamble portion contains cell-type-specific identification sequences, while the header portion may contain cell-type-specific flags or repetition patterns. This segmentation allows terminal devices to quickly identify cell types by examining only the preamble or header segments without needing to process the entire broadcast message, thereby enabling selective access without proportionally increasing overall network complexity.
Solution Approach 2:
The invention implements parameter changes by modifying specific parameters of the broadcast signal to encode cell type information. Different cell types transmit using different preamble sequences (parameter: sequence pattern), different header formats (parameter: structural arrangement), or different repetition patterns (parameter: transmission frequency). These parameter variations enable terminal devices to distinguish cell types through signal detection without requiring fundamentally different infrastructure components.
3Measurement precision
If cell types are differentiated by unique preambles or headers, then terminal devices can distinguish between them, but the signal structure becomes more complex
Solution Approach 1:
The invention applies preliminary action by pre-configuring distinct preamble sequences and header structures for different cell types before the terminal device attempts to access the network. The terminal device is pre-programmed with knowledge of these differentiated signal structures, enabling it to proactively identify and select its preferred cell type during the initial scanning phase, rather than attempting access first and determining cell type later.
Solution Approach 2:
The invention implements local quality by introducing cell-type-specific characteristics into specific portions of the broadcast signal - namely the preamble and header sections. Different cell types transmit identical functional information but encode it with unique local identifiers (specific preamble sequences, distinct header formats, or differentiated repetition patterns). This allows terminal devices to differentiate cell types by examining only these localized signal portions without needing to decode the entire broadcast message.
Data Source
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AI summary
The present invention relates to methods and apparatuses for providing selective network access, wherein a cell type indication is provided based on at least one of a preamble and a header portion of a broadcast signal. At the receiving end, it is checked based on at least one of the preamble and the header portion, whether broadcast signals are received from different first and second cell types. The first cell type is selected for network access, if both broadcast signals from the first and second cell types are received with sufficient strength.