Dynamic Paging Channel Selection for Coverage Enhanced Wireless Devices
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently paging and waking up devices in coverage enhanced mode, particularly for link budget limited devices with limited communication capabilities, as they may miss paging attempts due to varying coverage conditions and load on cellular base stations.
Innovation Solution
The system allows cellular base stations to dynamically select a paging arrangement based on cell loading and device coverage conditions, initially attempting to page on a control channel associated with normal or enhanced coverage conditions and switching if unsuccessful, enabling devices to adapt their monitoring accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control channel associated with enhanced coverage conditions is always used for paging, then devices have a higher likelihood of detecting and decoding paging indications, but base station loading increases
Solution Approach 1:
The system dynamically selects between different paging arrangements based on current cell loading conditions. When loading is below a threshold, the enhanced coverage control channel is used for reliable paging. When loading exceeds the threshold, the system switches to using the normal coverage control channel, thereby adapting to changing conditions and resolving the contradiction between reliability and loading.
Solution Approach 2:
The base station changes the parameter of control channel selection based on loading conditions. By monitoring cell loading and switching between different control channels (enhanced coverage vs. normal coverage) for paging, the system adjusts its operation to balance reliability requirements with resource availability.
2Reliability
If the base station attempts to page on multiple control channels, then paging success rate improves, but signaling load increases
Solution Approach 1:
The wireless device dynamically adapts its monitoring behavior based on the selected paging arrangement. When the base station uses a single control channel for paging, the device monitors only that channel. When the base station may use alternative control channels, the device monitors both channels, thereby dynamically adjusting monitoring effort to match base station paging strategy and avoiding unnecessary signaling.
Solution Approach 2:
The wireless device autonomously determines which control channels to monitor based on the paging arrangement selected by the base station. The device receives information about the paging arrangement and self-adjusts its monitoring behavior accordingly, eliminating the need for additional signaling between base station and device to coordinate channel monitoring.
3Reliability
If devices monitor both control channels for paging, then paging detection reliability improves, but device power consumption increases
Solution Approach 1:
The wireless device dynamically adjusts its monitoring strategy based on the selected paging arrangement. When the base station commits to using a single control channel for paging, the device monitors only that channel, conserving power. When the base station uses an alternative arrangement with multiple possible channels, the device monitors both channels to ensure reliable paging detection, thereby dynamically optimizing the balance between reliability and power consumption.
Data Source
AI summary
This disclosure relates to techniques for efficient idle mode wakeup for wireless devices supporting an enhanced coverage mode and a normal coverage mode in a wireless communication system. A wireless device may camp on a cellular base station in idle mode. The wireless device may monitor a control channel associated with the normal coverage mode during a paging occasion. The wireless device may also monitor a control channel associated with the enhanced coverage mode during the paging occasion if a paging indication is not successfully decoded on the control channel associated with the normal coverage mode.