Discovery Signal Sequence Determination in Unlicensed Spectrum
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Solution Overview
Problem
In unlicensed spectrum, existing technologies face challenges in determining discovery signal sequences due to multiple operators using the same standard, leading to ambiguity in operator association, especially when traditional methods like network planning and PLMN ID linkage become impractical.
Innovation Solution
Determining discovery signal sequences based on carrier frequency information and physical-layer cell identity, ensuring unique sequences for each operator, allowing wireless devices to identify matching sequences and associate them with the correct operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discovery signal sequences are determined using traditional network planning or PLMN ID linkage methods, then operator association can be established in licensed spectrum, but these methods become impractical and lead to ambiguity when multiple operators use the same unlicensed spectrum
Solution Approach 1:
The patent changes the parameter used for discovery signal sequence determination from PLMN ID to physical-layer cell identity (PCI). This parameter change enables unique sequence identification in unlicensed spectrum while maintaining reliability of operator association, as PCI remains unique even when multiple operators share the same unlicensed frequency.
2Adaptability or versatility
If multiple operators use the same unlicensed spectrum with traditional sequence determination methods, then spectrum utilization increases, but ambiguity in operator association occurs
Solution Approach 1:
The patent introduces carrier frequency information of the primary cell as an intermediary parameter that mediates between multiple operators sharing unlicensed spectrum. This intermediary enables the wireless device to correctly associate discovery signals with the appropriate operator by using the licensed primary cell's carrier frequency as a unique identifier, preventing loss of operator identity information.
3Reliability
If discovery signal sequences are made unique for each operator in unlicensed spectrum, then correct operator association is ensured, but sequence determination complexity increases
Solution Approach 1:
The patent applies preliminary action by having the wireless device determine the discovery signal sequence at the unlicensed secondary cell based on carrier frequency information obtained from the licensed primary cell before actual communication occurs. This preliminary determination using already-known primary cell parameters simplifies the overall process and reduces device complexity compared to more complex identification methods.
Data Source
AI summary
A wireless device, a radio network node, and methods therefor, for communicating in a network. The wireless device is configured to determine one or more possible first sequences of a discovery signal. The wireless device is configured to receive a second sequence of the discovery signal, and to determine if the one or more possible first sequences match the second sequence.