Uplink Reference Signal Sequence Initialization Signaling
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Solution Overview
Problem
Current wireless communication systems face significant signaling overhead in initializing pseudo-random sequence generators for uplink reference signals, particularly in achieving inter-cell orthogonality, which is essential for reducing interference and optimizing channel estimation in LTE networks.
Innovation Solution
The base station determines and encodes initialization sequences for wireless devices using subsets of possible sequences, reducing the number of bits required for signaling by using fewer parameters, such as a single parameter or a linear combination of parameters, while maintaining backwards compatibility and achieving inter-cell orthogonality through different orthogonal cover codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full initialization sequences are signaled to wireless devices, then sequence generator initialization is accurate and reliable, but signaling overhead increases significantly
Solution Approach 1:
The patent extracts only the necessary portion of the initialization sequence information that is not already known to the wireless device. Instead of signaling the complete 31-bit initialization sequence, only the unknown bits are signaled, significantly reducing overhead while maintaining initialization accuracy.
Solution Approach 2:
The patent introduces an intermediary calculation process where the wireless device uses already-known parameters (cell ID, sequence shift pattern) to pre-determine portions of the initialization sequence. The base station then only needs to signal the remaining unknown portion, acting as an intermediary to reduce the information that must be transmitted.
2Object-affected harmful factors
If different initialization sequences are assigned to achieve inter-cell orthogonality, then interference between reference signals is reduced, but the complexity of sequence management increases
Solution Approach 1:
The patent applies different initialization sequences locally to specific wireless devices based on their cell ID and sequence shift pattern. Each device receives a customized initialization sequence tailored to its specific context, ensuring orthogonality where needed while avoiding unnecessary complexity for devices that don't require it.
Solution Approach 2:
The patent changes specific parameters (cell ID, sequence shift pattern) of the initialization sequence to achieve inter-cell orthogonality. By modifying these parameters based on device-specific information, the system reduces interference without requiring complete reconfiguration of the sequence management system.
3Adaptability or versatility
If legacy devices use traditional initialization methods, then backwards compatibility is maintained, but new devices cannot achieve optimized inter-cell orthogonality
Solution Approach 1:
The patent creates a universal initialization method that works for both legacy and new wireless devices. The base station signals initialization parameters in a format that legacy devices can interpret using traditional methods while new devices can exploit the reduced overhead format for optimized inter-cell orthogonality, making the system multi-functional across different device types.
Solution Approach 2:
The patent introduces dynamic initialization where the initialization sequence is adapted based on the device type and network configuration. New devices can dynamically receive optimized initialization parameters for inter-cell orthogonality, while legacy devices continue to use traditional methods, allowing the system to be dynamic and adaptable to different device capabilities.
Data Source
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AI summary
A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.