Carrier Deactivation for In-Device Interference Control
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Solution Overview
Problem
Current technologies face challenges in effectively reducing interference between communications conducted in multiple frequency bands, particularly in in-device co-existence scenarios using carrier aggregation, where conventional filter technologies may not provide sufficient rejection, leading to interference issues between collocated radio transceivers.
Innovation Solution
An apparatus and method that determine interference situations between different frequency bands and deactivate one or more carriers to mitigate interference, using either autonomous denial procedures within the user equipment or interference reporting to the network control element, thereby controlling communications to minimize interference and maintain consistent throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filter technologies are used to avoid interference, then frequency separation is increased, but interference rejection is insufficient for adjacent frequency band communications
Solution Approach 1:
The patent replaces conventional mechanical filter technologies with a software-based interference control mechanism. The system uses a processor to execute software algorithms that dynamically determine interference situations and deactivate carriers, eliminating the need for complex hardware filter designs while achieving superior interference rejection for adjacent frequency band communications.
Solution Approach 2:
The patent changes the operational parameters of communications by dynamically deactivating specific carriers based on interference conditions. The system monitors transmission power levels and frequency band configurations, then adjusts carrier activation status to prevent interference, providing flexible interference control that adapts to varying operational scenarios.
2Adaptability or versatility
If multiple radio transceivers are collocated to enable diverse communications, then communication versatility is improved, but interference between transceivers increases
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors transmission power levels and interference conditions between multiple radio transceivers. Based on this feedback, the processor dynamically adjusts carrier activation to prevent interference while maintaining communication versatility. The system can identify when interference occurs and respond by deactivating specific carriers.
Solution Approach 2:
The patent introduces dynamic carrier deactivation based on real-time interference conditions. Rather than using static filter designs, the system adapts its behavior dynamically by monitoring transmission power and frequency configurations, then adjusting carrier activation status to prevent interference between collocated transceivers while maintaining overall communication versatility.
3Productivity
If transmit power is increased to maintain data rate, then communication productivity is improved, but interference level increases
Solution Approach 1:
The patent applies partial action by selectively deactivating only the specific carriers that cause interference while keeping other carriers active. Instead of shutting down all transmissions, the system identifies and deactivates only the problematic carriers, maintaining data rate for unaffected communications while reducing interference to vulnerable frequency bands.
Data Source
AI summary
There is provided a mechanism for controlling communications conducted in multiple frequency bands so as to decrease an interference level between the communications. When an interference situation caused between a first set UL communications performed on at least two different frequency bands and a DL communication performed on another frequency band is determined, a frequency carrier deactivation processing is conducted so as to deactivate either one of carriers of the at least two frequency bands of the set of UL communications. The deactivation processing includes for example an autonomous denial on the UE side or an interference reporting with deactivation on the eNB side.