Cognitive Pilot Channel Segmentation for Fast RAT Selection
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Solution Overview
Problem
In complex radio environments, user equipment faces challenges in quickly selecting the most suitable Radio Access Technology (RAT) due to dynamic spectrum allocation and flexible spectrum management, leading to time-and-power-consuming full frequency scanning, which affects network resource utilization and Quality of Service (QoS).
Innovation Solution
The method involves dividing Cognitive Pilot Channel (CPC) information into primary and secondary CPCs, where primary CPC information is loaded periodically into fixed physical resources for initial access and secondary CPC information is loaded into variable resources upon specific triggering events for network and radio-resource optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If in-band CPC is used to transmit CPC information, then user equipment can quickly select appropriate RAT, but the volume of downlink broadcast channel increases and occupies more fixed physical resources
Solution Approach 1:
The CPC information is segmented into two types: type 1 CPC information (basic RAT selection info) and type 2 CPC information (detailed network optimization info). Type 1 is transmitted periodically on fixed physical resources, while type 2 is transmitted on variable physical resources triggered by specific events. This segmentation allows UE to quickly obtain essential RAT selection information without being burdened by large volumes of detailed CPC information.
Solution Approach 2:
The patent introduces dynamic resource allocation for type 2 CPC information, where variable physical resources are allocated based on triggering events (spectrum selection, load balancing, handover, etc.). This dynamic approach allows the system to transmit detailed CPC information only when needed, reducing the overall volume of broadcast channel while maintaining fast RAT selection capability.
2Area of stationary object
If out-of-band CPC is used to transmit CPC information, then large cell coverage can be achieved, but coverage loopholes occur and coordination within large range is required
Solution Approach 1:
The patent segments CPC information transmission into two layers: a general layer (type 1 CPC) that can be covered by large cells using out-of-band transmission, and a local layer (type 2 CPC) that provides location-specific information. This segmentation allows large cell coverage for basic information while avoiding the need for complex coordination across the entire large coverage area, as detailed information is provided locally when needed.
3Loss of information
If full frequency scanning is performed to find selectable radio access network, then complete network information can be obtained, but time and power are consumed
Solution Approach 1:
The base station performs preliminary action by pre-processing and categorizing CPC information into type 1 (essential for initial access) and type 2 (detailed optimization information). This preliminary organization allows UE to quickly obtain critical network information through type 1 CPC without performing exhaustive full frequency scanning, significantly reducing power consumption while maintaining information completeness.
Solution Approach 2:
The patent introduces CPC information as an intermediary that carries pre-processed network information from the base station to the UE. This intermediary mechanism allows UE to obtain comprehensive network information (including frequency points, RAT types, and network parameters) without directly performing energy-consuming full frequency scanning, as the base station has already prepared and transmitted this information through CPC.
Data Source
AI summary
The disclosure provides a method for transmitting Cognitive Pilot Channel (CPC) information, a radio access method and system based on CPC information, wherein the method for transmitting CPC information includes: dividing a CPC into a primary CPC for transmitting primary CPC information and a secondary CPC for transmitting secondary CPC information; loading the primary CPC information periodically into fixed physical resources, and sending the primary CPC information to a user equipment; after a base station receives a preset triggering event, loading the secondary CPC information into variable physical resources, and sending the secondary CPC information to the user equipment. In the disclosure, the base station loads the primary CPC information into fixed physical resources of an RAT according to an RAT coverage condition, reducing the amount of information required to be delivered by fixed physical resources, decreasing occupation of fixed physical resources, speeding up radio access of the user equipment; and after receiving a triggering event, the base station loads the secondary CPC information into variable physical resources and sends the secondary CPC information to the user equipment, thus implementing optimization of a user network and radio resources.