Adaptive Probing Pilot Selection in Combined Radio Cells
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Solution Overview
Problem
In combined radio cell deployments, the introduction of probing pilots can lead to delays in selecting the best node for user equipment (UE) due to the need to receive channel quality information from multiple low-power nodes, resulting in reduced average link throughput and increased UE battery consumption.
Innovation Solution
A method where a radio network control element assigns a set of probing pilots to a combined radio cell, transmits information about these pilots to the UE, receives channel quality feedback, ranks the pilots, selects a subset, and reconfigures the UE to use only the best pilots for subsequent probing, thereby reducing the number of pilots used and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If probing pilots are transmitted from all low-power nodes in a combined radio cell, then channel quality information can be obtained for node selection, but the UE experiences increased battery consumption and processing delays
Solution Approach 1:
The patent segments the set of probing pilots into multiple subsets and distributes them across different transmission points. Instead of requiring the UE to process all pilots from all low-power nodes simultaneously, the pilots are divided and transmitted in an organized manner, reducing the processing burden on the UE while maintaining comprehensive channel quality assessment capability.
Solution Approach 2:
The patent implements preliminary action by having the network control element pre-assign and pre-transmit information about the set of probing pilots to the UE before the actual probing process. This allows the UE to be prepared in advance with the necessary pilot information, reducing real-time processing requirements and battery consumption during the actual channel quality measurement phase.
2Reliability
If channel quality information is received from multiple low-power nodes for node selection, then the best node can be selected, but delays occur in the selection process
Solution Approach 1:
The patent segments the probing pilot collection process into organized subsets transmitted from different low-power nodes. This segmentation allows the network to systematically collect and process channel quality information from multiple nodes without requiring the UE to process all pilots simultaneously, thereby reducing the time required for node selection while maintaining selection accuracy.
Solution Approach 2:
The network control element performs preliminary actions by pre-transmitting pilot information and organizing the probing process before actual node selection is needed. This preliminary organization of pilot transmission and information gathering reduces the time required for the actual node selection process, as the framework is already in place when selection is required.
3Reliability
If a large number of probing pilots are used in mass cell deployment scenarios, then comprehensive channel coverage is achieved, but the complexity of pilot management and processing increases
Solution Approach 1:
The patent applies segmentation by dividing the large set of probing pilots into multiple smaller subsets that are distributed across different transmission points. This segmentation simplifies pilot management by organizing pilots in a structured manner, making it easier to track, transmit, and process individual subsets rather than managing all pilots as a single large set, while still achieving comprehensive channel coverage through the combined subsets.
Data Source
AI summary
The present disclosure relates to radio communication and, more particularly, utilization of probing pilots (e.g. F-CPICHs) in a combined radio cell deployment. In one of its aspects, the disclosure presents an adaptive utilization of probing pilots in a combined radio cell deployment.