Dedicated Reference Subframes for Synchronization
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in spectrum usage and power consumption due to the need for cell-specific reference symbols in every subframe, which causes interference and reduces spectral efficiency and increases UE power consumption.
Innovation Solution
Implementing a periodic dedicated reference subframe synchronized across base stations, using orthogonal reference signals, such as different cyclic shifts of Zadoff-Chu root sequences, to facilitate synchronization and measurement purposes, thereby reducing the need for cell-specific reference symbols in data subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell-specific reference symbols are included in every subframe, then synchronization and measurement functions are maintained, but spectral efficiency decreases and power consumption increases
Solution Approach 1:
The patent extracts the reference symbol transmission from every subframe and concentrates it into a dedicated reference subframe. This allows the reference symbols to be removed from data subframes, thereby improving spectral efficiency while maintaining synchronization and measurement functions through the dedicated reference subframe.
Solution Approach 2:
The patent implements periodic reference subframes that occur at specific intervals rather than continuous reference symbols in every subframe. This periodic structure maintains the necessary synchronization and measurement capabilities while reducing overall resource consumption and improving spectral efficiency in non-reference subframes.
2Reliability
If cell-specific reference symbols are included in every subframe, then synchronization and measurement functions are maintained, but power consumption increases
Solution Approach 1:
The patent extracts reference symbol transmission from every subframe and concentrates it into dedicated reference subframes. This reduction in transmission frequency directly lowers power consumption for both network infrastructure and user equipment while maintaining synchronization and measurement functions.
Solution Approach 2:
By implementing periodic reference subframes instead of continuous transmission, the patent reduces the duty cycle of reference signal transmission. This periodic structure maintains necessary functions while significantly reducing power consumption compared to continuous transmission in every subframe.
3Object-affected harmful factors
If base stations transmit reference signals in synchronized subframes, then interference robustness improves, but coordination complexity increases
Solution Approach 1:
The patent merges reference signal transmissions from multiple base stations into synchronized reference subframes. By coordinating these transmissions to occur simultaneously, the system achieves interference robustness through constructive interference and signal reinforcement, while the periodic structure simplifies coordination compared to continuous synchronization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances spectral efficiency, reduces interference, and conserves power by allowing more efficient use of spectrum and lowering the power consumption of network infrastructure and user equipment.
Implementation Method 1
different cyclic shifts of Zadoff-Chu root sequences might be used by different base stations
Data Source
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AI summary
This disclosure relates to using a dedicated reference subframes in a cellular communication system. According to one embodiment, a base station may transmit reference signals in a dedicated synchronization and measurement reference subframe. Neighboring base stations may also transmit reference signals in dedicated reference subframes in a temporally coordinated (synchronized) manner. The reference signals transmitted be each base station may be orthogonal with the reference signals transmitted by each neighboring base station. The reference subframes may be transmitted periodically, and data subframes may be transmitted between reference subframes. Some or all of the data subframes may not include cell-specific reference symbols, as their function may be unnecessary given the use of the dedicated reference subframes.