Femto Cell Discovery Protocol Using Macro Timing Synchronization
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Solution Overview
Problem
Femto cells periodically transmitting broadcast signals cause interference to nearby macro cells and unnecessarily consume power in user equipment (UE) as UE attempts to decode signals even if it cannot connect to the femto cell.
Innovation Solution
A method where a femto cell receives timing information from a macro cell and transmits a broadcast signal based on this information, and a UE receives timing information from a macro cell to determine whether to connect to the femto cell, thereby reducing interference and power consumption by using shorter discovery signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If femto cells periodically transmit broadcast signals, then femto cell discovery and connection is enabled, but interference to nearby macro cells increases and UE power consumption increases due to unnecessary signal decoding
Solution Approach 1:
The patent implements periodic femto cell discovery signals transmitted only during specific discovery subframes rather than continuous periodic broadcast signals. The femto cell transmits discovery signals in a periodic manner with configurable periodicity, allowing UEs to detect femto cells while reducing overall transmission time and interference to macro cells.
Solution Approach 2:
The patent segments the broadcast signal transmission into separate discovery signals transmitted only in specific discovery subframes, rather than continuous periodic broadcast. This segmentation allows the system to separate femto cell discovery functionality from full broadcast transmission, enabling discovery while minimizing interference and power consumption.
2Adaptability or versatility
If femto cells periodically transmit broadcast signals, then femto cell discovery is enabled, but UE power consumption increases due to unnecessary signal decoding
Solution Approach 1:
The patent implements periodic femto cell discovery signals transmitted only during specific discovery subframes rather than continuous periodic broadcast signals. The femto cell transmits discovery signals in a periodic manner with configurable periodicity, allowing UEs to detect femto cells while reducing overall transmission time and interference to macro cells.
Solution Approach 2:
The patent applies partial action by transmitting only the essential discovery signal portion rather than complete broadcast signals. UEs can detect femto cells using these partial discovery signals without needing to decode full broadcast content, reducing power consumption while maintaining discovery capability.
3Reliability
If UEs attempt to decode broadcast signals from femto cells, then connection establishment is possible, but power consumption increases unnecessarily when connection cannot be established
Solution Approach 1:
The patent segments the broadcast signal transmission into separate discovery signals transmitted only in specific discovery subframes, rather than continuous periodic broadcast. This segmentation allows the system to separate femto cell discovery functionality from full broadcast transmission, enabling discovery while minimizing interference and power consumption.
Solution Approach 2:
The patent applies partial action by transmitting only the essential discovery signal portion rather than complete broadcast signals. UEs can detect femto cells using these partial discovery signals without needing to decode full broadcast content, reducing power consumption while maintaining discovery capability.
4Loss of information
If femto cells transmit continuous broadcast signals, then complete system information is provided, but interference to macro cells increases
Solution Approach 1:
The patent implements periodic femto cell discovery signals transmitted only during specific discovery subframes rather than continuous periodic broadcast signals. The femto cell transmits discovery signals in a periodic manner with configurable periodicity, allowing UEs to detect femto cells while reducing overall transmission time and interference to macro cells.
Solution Approach 2:
The patent segments the broadcast signal transmission into separate discovery signals transmitted only in specific discovery subframes, rather than continuous periodic broadcast. This segmentation allows the system to separate femto cell discovery functionality from full broadcast transmission, enabling discovery while minimizing interference and power consumption.
Data Source
AI summary
A method, a computer program product, and an apparatus are provided in which the apparatus (e.g., a femto cell) receives timing information from a second apparatus (e.g., a macro cell). The apparatus receives a signal from a third apparatus (e.g., a UE) based on the received timing information. The apparatus transmits a broadcast signal based on the received signal. A method, a computer program product, and an apparatus are provided in which the apparatus (e.g., a UE) receives timing information from a second apparatus (e.g., macro cell). The apparatus transmits a signal to a third apparatus (e.g., a femto cell) based on the received timing information. The apparatus receives a broadcast signal from the third apparatus in response to the signal.