Coverage Enhancement Mode Indication in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, especially for Machine-Type Communications (MTC) devices, there is a need to efficiently indicate changes in coverage enhancement mode to avoid unnecessary repetition of messages and optimize power consumption, particularly for devices deployed in challenging environments like basements or buildings with thick insulation, where radio interface penetration losses are significant.
Innovation Solution
A method where User Equipment (UE) initiates detaching and re-attaching with the network when a change in coverage enhancement mode occurs, allowing the UE to determine and communicate the necessary mode changes, such as repetition requirements, to the network, thereby optimizing coverage enhancement schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coverage enhancement mode is changed without network notification, then UE can adapt to changing coverage conditions, but network cannot know the current CE mode of UE
Solution Approach 1:
The patent implements feedback by having the UE send a CE Mode Indication message to the network when the CE mode changes. This feedback mechanism ensures the network is informed of the UE's current coverage enhancement mode, resolving the information asymmetry while allowing the UE to adapt to changing coverage conditions.
Solution Approach 2:
The patent requires the UE to notify the network before or upon changing the CE mode. This preliminary action ensures the network is prepared for the mode change and can adjust its transmissions accordingly, preventing communication errors while maintaining adaptability.
2Reliability
If message repetition is continuously performed for coverage enhancement, then coverage is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of coverage enhancement parameters based on current channel conditions. The UE monitors coverage conditions and adjusts the CE mode (including message repetition) accordingly, rather than continuously maintaining maximum repetition. This dynamic approach ensures coverage is improved only when necessary, reducing unnecessary power consumption.
Solution Approach 2:
The patent changes coverage enhancement parameters (such as repetition factor, message size, or transmission power) based on detected coverage conditions. When conditions improve, the UE can reduce repetition or switch to normal mode, thereby reducing power consumption while maintaining adequate coverage.
3Use of energy by moving object
If CE mode changes are not notified to network, then power consumption is reduced, but communication efficiency decreases
Solution Approach 1:
The patent uses feedback mechanisms where the UE notifies the network of CE mode changes through standardized signaling messages. This ensures communication efficiency is maintained by keeping the network informed, while the feedback is triggered only when actual mode changes occur, avoiding unnecessary signaling and associated power consumption.
Data Source
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AI summary
A method and apparatus for indicating change of a coverage enhancement (CE) mode in a wireless communication system is provided. A CE mode for coverage enhancement may be defined. A user equipment (UE) determines whether the CE mode changes. If it is determined that the CE mode changes, the UE detaches with a network, and re-attaches with the network based on the changed CE mode.