Carrier Aggregation Scheduling for In-Device Coexistence
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Solution Overview
Problem
In wireless networks, mobile devices face in-device coexistence problems due to interference between different radio signals from transceivers and receivers, such as LTE, Wi-Fi, Bluetooth, and GNSS, which cannot be resolved solely by filtering or timing adjustments, requiring network assistance to manage carrier aggregation effectively.
Innovation Solution
A method and system where a mobile device indicates in-device coexistence problems to the LTE network, which applies time-domain or frequency-domain solutions, including DRX adjustments and HARQ puncturing, and reassesses component carriers to prevent interference, potentially removing affected carriers from secondary serving cells and adding non-interfering ones, to maintain proper operation of multiple radio systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radios operate concurrently in a mobile device, then the device can support multiple wireless applications (VoIP, Wi-Fi, Bluetooth, GNSS), but radio signal interference occurs between different transceivers and receivers
Solution Approach 1:
The patent segments the radio resource scheduling problem into two distinct domains: time-domain scheduling (allocating different time slots to different radios) and frequency-domain scheduling (assigning different frequency carriers to different radios). This segmentation allows the network to independently optimize each dimension to resolve interference while maintaining support for multiple concurrent applications.
Solution Approach 2:
The patent introduces a new dimension of control by implementing cross-domain scheduling that coordinates both time and frequency resources. When interference is detected in one domain, the system can compensate by optimizing resources in the other domain, effectively adding a dimensional degree of freedom to resolve the interference problem.
2Productivity
If carrier aggregation is used to increase network bandwidth, then more component carriers are aggregated, but in-device coexistence problems become more complex due to multiple affected radios
Solution Approach 1:
The patent implements a feedback mechanism where the mobile device monitors for in-device coexistence problems and reports them to the network. The network then uses this feedback information to dynamically adjust the carrier aggregation configuration, adding or removing component carriers based on actual interference conditions rather than static pre-configuration.
Solution Approach 2:
The patent dynamically changes scheduling parameters (time slots, frequency carriers, DRX cycles) based on the severity and type of in-device coexistence problems detected. The system can adjust these parameters in real-time to optimize both bandwidth utilization and interference management for carrier aggregation scenarios.
3Object-affected harmful factors
If time-domain solutions are applied to resolve in-device coexistence problems, then radio interference is reduced, but network resource utilization may decrease due to scheduling restrictions
Solution Approach 1:
The patent employs dynamic scheduling that adapts time-domain and frequency-domain resource allocation based on real-time network conditions and interference patterns. Rather than applying static time-domain restrictions, the system dynamically adjusts scheduling decisions to minimize interference while maximizing resource utilization, allowing flexible trade-offs between these competing objectives.
Solution Approach 2:
When time-domain scheduling alone cannot resolve in-device coexistence problems without excessive resource restrictions, the patent transitions to or combines with frequency-domain scheduling. This dimensional shift allows the system to resolve interference by allocating different frequency carriers instead of imposing time restrictions, thereby maintaining higher network resource utilization.
4Object-affected harmful factors
If frequency-domain solutions are applied to reassign component carriers, then in-device coexistence problems are resolved, but carrier aggregation configuration becomes more complex
Solution Approach 1:
The patent enables the network to automatically manage carrier aggregation configuration in response to in-device coexistence problems. The system self-adjusts by adding or removing component carriers based on interference reports, eliminating the need for manual configuration and reducing the operational complexity despite the dynamic reconfiguration.
Solution Approach 2:
The patent dynamically changes carrier aggregation parameters (which component carriers are aggregated, their assignment to serving cells) based on detected in-device coexistence problems. This automated parameter adjustment resolves interference while managing configuration complexity through algorithmic decision-making rather than manual intervention.
Data Source
AI summary
The present disclosure describes techniques and apparatuses for scheduling use of radio resources in a wireless network. In some aspects a method is described that includes receiving an indication from a mobile device of an in-device coexistence problem, and determining, from the parameters in the received indication, one or more component carriers of the carrier aggregation affected by the in-device coexistence problem. The method also includes applying a time-domain solution and/or a frequency domain solution to at least one of the one or more affected component carriers to solve the in-device coexistence problem.