NB-IoT Paging Optimization via Dynamic Repetition Configuration
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Solution Overview
Problem
In Narrowband IoT (NB-IoT) systems, the existing paging procedures face challenges with inefficient repetition number management during extended discontinuous reception (eDRX), leading to potential paging delays and increased complexity for user equipment (UE) due to blind decoding attempts and power consumption issues.
Innovation Solution
The method involves configuring a different repetition number for each paging occasion (PO) within the paging transmission window (PTW), derived from the coverage enhancement (CE) level and number of POs, allowing the UE to selectively monitor paging messages based on its current CE mode, thereby optimizing paging reliability and reducing unnecessary decoding attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed repetition number is used for paging transmission in NB-IoT, then the paging procedure is simple to implement, but paging reliability deteriorates in extended discontinuous reception (eDRX) scenarios due to misalignment between UE and network repetition factors
Solution Approach 1:
The patent applies dynamics by making the repetition number configurable and adaptable rather than fixed. The network can dynamically adjust the repetition number based on UE feedback and eDRX configuration, allowing the system to optimize paging transmission reliability for different scenarios while maintaining implementation feasibility through standardized procedures.
Solution Approach 2:
The patent changes the parameter of repetition number from a fixed value to a configurable parameter that can be adjusted based on eDRX settings and UE capabilities. This allows the system to adapt the repetition factor to match both network and UE configurations, resolving the reliability issue while maintaining reasonable implementation complexity through parameterization.
2Reliability
If the UE monitors all paging occasions with blind decoding attempts, then paging reception reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by having the network transmit paging messages with appropriate repetition numbers before the UE needs to decode them. The network prepares and transmits the paging message with sufficient repetitions in advance, allowing the UE to wake up at predetermined occasions and decode without needing to attempt blind decoding multiple times, thus reducing power consumption while ensuring reliability.
Solution Approach 2:
The patent introduces feedback mechanisms where the UE provides information about its eDRX configuration and capabilities to the network. Based on this feedback, the network optimizes the repetition number and paging occasion selection, enabling the UE to monitor only necessary paging occasions with appropriate repetition levels, thereby reducing power consumption while maintaining reliable paging reception.
3Reliability
If the network transmits paging messages with maximum repetition numbers for all UEs, then paging reliability is improved, but network resource consumption and latency increase
Solution Approach 1:
The patent applies local quality by assigning different repetition numbers to different UEs or different paging occasions based on specific UE requirements and eDRX configurations. Instead of using maximum repetition numbers for all UEs uniformly, the system tailors the repetition factor locally to each UE's needs, ensuring reliable paging transmission for devices that require it while reducing latency and resource consumption for devices that can decode with fewer repetitions.
4Use of energy by moving object
If the UE uses extended discontinuous reception (eDRX) to reduce power consumption, then energy efficiency is improved, but paging reception reliability deteriorates due to misalignment in repetition number interpretation
Solution Approach 1:
The patent applies universality by creating a standardized mechanism that works for both eDRX and non-eDRX UEs. The solution provides a universal approach to repetition number configuration that accommodates different UE types and power management modes, ensuring reliable paging reception for energy-efficient eDRX devices while maintaining compatibility with traditional UE operations through a unified framework.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for narrow band internet of things (NB-IoT) paging optimization are provided. One method includes, when extended discontinuous reception (eDRX) is not configured for a user equipment (UE), applying a maximum repetition number of each coverage enhancement (CE) mode for paging transmission and associating a different repetition number with each paging occasion (PO). When extended discontinuous reception (eDRX) is configured for the user equipment, the method includes associating each paging occasion (PO) with a different repetition number.