Cognitive Pilot Channel Bandwidth Reduction via Mesh Difference Transmission
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Solution Overview
Problem
The existing Mesh-based Cognitive Pilot Channel (CPC) concept requires a large frequency band for transmitting information about available operators, Radio Access Technologies (RAT), and frequencies across a geographical area, leading to increased data rate and bandwidth usage, which is inefficient.
Innovation Solution
The method involves defining a reference mesh and transmitting only the differences in information between the reference mesh and each given mesh, allowing User Equipment to infer the complete list of available operators, technologies, and frequencies, thereby reducing the CPC bandwidth and message length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Mesh based concept is used to provide precise information about operators, RAT and Frequencies available in each mesh, then information precision is improved, but CPC bandwidth requirement increases
Solution Approach 1:
The geographical area is divided into multiple meshes, and information is segmented and transmitted selectively for each mesh rather than broadcasting complete information to all meshes. This allows precise information delivery while reducing overall bandwidth consumption.
Solution Approach 2:
Different information is transmitted to different meshes based on their specific characteristics. Each mesh receives customized information about operators, RAT and frequencies available in that particular mesh, rather than uniform information across all meshes.
2Loss of information
If complete information is transmitted to each mesh, then information completeness is improved, but data rate increases
Solution Approach 1:
Only the essential difference information is extracted and transmitted for each mesh, rather than transmitting complete information sets. The UE reconstructs complete information by combining received difference information with previously stored reference information.
Solution Approach 2:
Reference information is transmitted and stored in advance for each mesh. When updating information, only changes are transmitted, and the UE uses preliminary stored reference information to reconstruct complete current information, reducing ongoing data transmission requirements.
3Productivity
If CPC message length is reduced, then transmission efficiency is improved, but message robustness may deteriorate
Solution Approach 1:
The UE reconstructs complete information messages by combining received difference information with stored reference information copies. This allows transmission of shorter messages while maintaining the robustness of complete information at the receiver through intelligent reconstruction.
Data Source
AI summary
The invention relates to a method for reducing a Cognitive Pilot Channel (CPC) bandwidth used for transmitting lists of information to a plurality of meshes of a geographical area comprising at least one base station (4) covering n meshes to allow a User Equipment camping on a given mesh among said plurality of meshes to select an operator and/or an access technology and/or a communication frequency available in said given mesh.According to the invention, for a given mesh #i (i=2 to n), the base station transmits to said mesh #i an identifier of a predetermined reference mesh and the difference between the list of information intended for said given mesh and the list of information intended for said reference mesh.