Coverage Class Update Signaling for eDRX Paging Alignment
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently conveying changes in downlink coverage class by wireless devices to the network, leading to excessive signaling load and misalignment of paging groups, which affects battery life and coverage reliability, especially for machine-type communications.
Innovation Solution
Implementing methods for wireless devices, RAN nodes, and CN nodes to efficiently update downlink coverage classes and align paging groups within the eDRX cycle by using cell updates, reserved SAPI values, and modified UL-UNITDATA PDUs, allowing for power-efficient signaling and minimizing the risk of missed pages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices use traditional methods to convey coverage class changes to the network, then coverage reliability is maintained, but signaling load increases excessively
Solution Approach 1:
The patent extracts only the essential coverage class information from full signaling messages and conveys it through compact indicators in uplink transmissions. Instead of sending complete coverage class reports, the system uses extracted indicators that require minimal signaling resources while maintaining the ability to convey coverage class changes reliably.
Solution Approach 2:
The patent changes the parameter representation of coverage class information by using condensed indicators rather than full messages. The coverage class is represented through compact parameter changes in existing uplink channels, transforming the signaling from detailed messages to concise parameter updates that reduce load while preserving reliability.
2Reliability
If wireless devices update coverage class frequently to maintain accuracy, then coverage reliability improves, but battery life decreases due to increased signaling
Solution Approach 1:
The patent implements periodic coverage class updates rather than continuous or event-driven updates. The wireless device conveys coverage class information at predetermined intervals using compact indicators, which maintains adequate coverage accuracy while significantly reducing the energy consumption associated with frequent signaling transmissions.
Solution Approach 2:
The patent uses inexpensive, short-lived signaling indicators that can be transmitted frequently without significant energy cost. These compact coverage class indicators are designed to be lightweight and disposable in terms of signaling resources, allowing periodic updates that maintain accuracy without draining battery life.
3Device complexity
If paging groups are not aligned across coverage classes, then device complexity is reduced, but paging reliability deteriorates due to missed pages
Solution Approach 1:
The patent merges the paging group structures across different coverage classes by aligning them to common time resources. Instead of maintaining separate paging groups for each coverage class, the system combines them into unified paging occasions that all devices monitor, eliminating complexity while ensuring that devices transitioning between coverage classes do not miss pages.
Solution Approach 2:
The patent creates universal paging groups that serve multiple coverage classes simultaneously. The aligned paging structure functions for devices in all coverage classes, providing multi-functionality that maintains paging reliability across different radio conditions without requiring complex coverage-class-specific paging group management.
4Loss of information
If the network uses detailed coverage class reporting from devices, then network awareness of device conditions improves, but signaling intensity increases
Solution Approach 1:
The network extracts essential coverage class information from device transmissions using compact indicators rather than requiring detailed reports. This extraction approach maintains adequate network awareness of device coverage conditions while significantly reducing the signaling intensity required to convey this information.
Solution Approach 2:
The patent applies partial action by conveying only the necessary portion of coverage class information needed for network decision-making. Instead of complete and excessive reporting, the system uses partial information through compact indicators that provide sufficient network awareness without the overhead of detailed reporting.
Data Source
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AI summary
Techniques are described herein that enhance the following: (1) how a wireless device conveys a change of its downlink (DL) coverage class (CC) to a network; and (2) how the network and the wireless device each perform a new paging group procedure to align coverage class paging groups within a given Extended Discontinuous Receive (eDRX) cycle for the wireless device. In addition, devices namely a wireless device, a radio access network node (e.g., Base Station Subsystem), and a core network node (e.g., Serving GPRS Support Node) that implement these techniques are described herein.