Open RAN Sleeping Cell Detection Using Connection State Criteria
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Solution Overview
Problem
Cells in a radio access network can enter a sleep state, becoming unresponsive to uplink transmissions and causing coverage gaps, which are not addressed by existing technologies.
Innovation Solution
Detection and recovery techniques for sleeping cells in a radio access network, utilizing connection state criteria such as RACH failures, handover success rates, and resource utilization metrics to identify and recover cells from a sleep state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a cell enters a sleep state to save energy, then energy consumption is reduced, but network coverage and reliability deteriorate
Solution Approach 1:
The system performs preliminary detection of sleeping cells by monitoring connection state criteria (RACH failures, handover success rates, resource utilization metrics) before the sleep state causes complete coverage loss. This early detection enables proactive recovery actions to be taken, maintaining network coverage while allowing energy-saving sleep states.
Solution Approach 2:
The system implements a feedback mechanism where the network entity continuously monitors connection state criteria and sends recovery commands to wake up sleeping cells when degradation is detected. This closed-loop feedback ensures that energy-saving sleep states do not compromise network coverage below acceptable thresholds.
2Loss of energy
If a cell enters a sleep state, then energy consumption is reduced, but detection and measurement difficulty increases
Solution Approach 1:
The network entity acts as an intermediary that monitors connection state criteria (RACH failures, handover success rates, resource utilization) to indirectly detect sleeping cells. Instead of directly detecting the sleep state, the system uses these intermediary metrics that are easier to measure and provide reliable indicators of cell status.
Solution Approach 2:
The sleeping cell detection and recovery system is self-service in that it automatically monitors connection state criteria and triggers recovery commands without manual intervention. The network entity autonomously identifies sleeping cells through criterion evaluation and initiates wake-up procedures, eliminating the need for external detection mechanisms.
3Reliability
If connection state criteria monitoring is implemented to detect sleeping cells, then network coverage is improved, but device complexity increases
Solution Approach 1:
The network entity uses existing multi-functional monitoring capabilities to detect sleeping cells. The same infrastructure that tracks RACH failures, handover success rates, and resource utilization for normal network operation is leveraged for sleeping cell detection, avoiding the need for separate dedicated detection systems and reducing overall complexity.
Solution Approach 2:
The system detects sleeping cells by monitoring changes in connection state parameters (RACH failure rates, handover success rates, resource utilization metrics) rather than implementing complex new detection mechanisms. By focusing on parameter changes in existing metrics, the system maintains simplicity while improving coverage reliability.
Data Source
AI summary
A method and apparatus for cell sleep state detection and recovery are provided. In the method and apparatus, one or more connection state criteria indicative of whether a cell is in a sleep state are evaluated to determine whether the one or more connection state criteria are met. The one or more connection state criteria are selected from a random access channel (RACH) criterion, a channel measurement criterion, a cell handover criterion, a connection statistics criterion, a connected user equipment criterion, or a measurement change criterion. It is determined whether the cell is in the sleep state based on whether at least one of the one or more connection state criteria are met and in response to determining that the cell is in the sleep state, action is taken to cause the cell to exit the sleep state.