CSG Cell Measurement Reporting Configuration in Connected Mode
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Solution Overview
Problem
Current wireless communication systems, particularly E-UTRAN, lack effective mechanisms for user equipment (UE) to report measurements between macro cells and closed subscriber group (CSG) cells while in the RRC connected state, leading to challenges in UE mobility and measurement configuration.
Innovation Solution
The system sends a range indicator to distinguish private cells from non-private cells, with a first indicator determining whether to report private cells and a second indicator specifying which private cells to report, allowing the UE to include or exclude CSG cell measurements in its reports, and introduces new information elements like CSG-PCI-Range and MeasID to facilitate proper measurement reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network tracks UE capabilities regarding CSG access to enable measurement reporting, then measurement reporting accuracy improves, but network complexity and signaling overhead increase
Solution Approach 1:
The UE autonomously determines whether to include CSG cell measurements in its reports by checking its own whitelist membership and responding to the first indicator from the network, eliminating the need for the network to track and manage detailed UE capability information regarding CSG access
Solution Approach 2:
The patent extracts the capability tracking function from the network side and transfers it to the UE side, where the UE self-manages its CSG access capability information and uses it to autonomously make measurement reporting decisions based on network indicators
2Measurement precision
If the system uses detailed indicators to specify which private cells to report, then measurement reporting precision improves, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing specific second indicators only for CSG cells that require differentiated treatment, while other cells use default reporting behavior, thus achieving precise control where needed without unnecessary signaling for all cells
Solution Approach 2:
Instead of providing comprehensive indicators for all possible cells, the system uses partial action by only specifying indicators for particular CSG cells that need special handling, reducing signaling overhead while maintaining necessary precision
3Device complexity
If the UE autonomously determines CSG cell reporting without network tracking, then network complexity decreases, but measurement reporting reliability may worsen
Solution Approach 1:
The network provides feedback through the first indicator (whether to report private cells) and second indicator (which private cells to report), which the UE uses to autonomously make reliable reporting decisions, combining network guidance with UE autonomy
Solution Approach 2:
The UE performs preliminary action by pre-configuring its whitelist of allowed CSG cells and using this pre-stored information to autonomously determine reporting behavior, ensuring reliable operation without requiring real-time network tracking
Data Source
AI summary
A network sends to a user equipment UE a range indicator by which a private cell can be distinguished from a non-private cell, a first indicator that indicates whether or not to report private cells in a measurement report, and a second indicator that indicates which private cells are to have their measurements reported. The UE receives these, in an embodiment all in a same message. The UE uses the second indicator to identify at least one cell to report and the received range indicator to distinguish private cells from non-private cells; measures a signal from the identified at least one cell which is determined by the range indicator to be a private cell; and sends to the network a measurement report that comprises a measurement indication from the identified and determined at least one private cell. The network receives from the UE that measurement report.