Signaling Problematic UL CA Combinations for IDC Interference
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Solution Overview
Problem
Current technologies face challenges in addressing In-Device Coexistence (IDC) interference issues in uplink Carrier Aggregation (CA) scenarios, particularly where inter-band transmissions cause Inter-Modulation (IM) products that affect co-located Global Navigation Satellites System (GNSS) and other systems, as existing IDC mechanisms do not effectively identify problematic UL CA combinations.
Innovation Solution
The method involves the User Equipment (UE) sending an IDC indication to the eNB, including information on problematic UL CA combinations, which are identified by measurement object identities for corresponding downlink carriers, allowing the eNB to deduce frequencies to avoid for UL CA, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio transceivers are equipped in a UE to access various networks, then network access capability is improved, but interference between co-located transceivers occurs
Solution Approach 1:
The patent extracts and identifies specific problematic UL CA combinations that cause IDC interference, separating them from valid combinations. By signaling only the problematic combinations to the network, the interference issue is isolated and can be addressed without affecting other functional combinations.
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors for IDC interference and sends IDC indications to the network when interference is detected. This feedback loop enables the network to adjust resource allocation and avoid configuring problematic UL CA combinations, thereby resolving the interference while maintaining network access capability.
2Productivity
If UL CA combinations are used to increase bandwidth, then data transmission capacity is improved, but IDC interference with co-located systems occurs
Solution Approach 1:
The patent segments the set of all possible UL CA combinations into two categories: problematic combinations that cause IDC interference and non-problematic combinations. By identifying and signaling specific problematic combinations (e.g., inter-band combinations causing 3rd order IM products), the system can selectively avoid only the harmful segments while maintaining productivity with safe combinations.
Solution Approach 2:
The patent changes the parameter being signaled from general interference conditions to specific UL CA combination identifiers. This parameter change enables precise control over which frequency combinations are avoided, allowing the system to maintain high data transmission capacity by only restricting problematic combinations rather than limiting all CA operations.
3Reliability
If IDC indication signaling is implemented to avoid interference, then interference mitigation is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for interference mitigation - the specific problematic UL CA combination identifiers - and signals only this extracted information to the network. This selective signaling approach provides sufficient interference mitigation capability while minimizing signaling overhead by excluding unnecessary detailed information.
Data Source
AI summary
The present disclosure provides methods, devices, and systems for signaling of In-Device Coexistence (IDC) problems in uplink (UL) Carrier Aggregation (CA). Embodiments of a method in a User Equipment (UE) in communication with an Evolved Node B (eNB) are disclosed. In some embodiments, the method in the UE comprises sending an IDC indication to the eNB including information of problematic UL CA combinations. In this manner, the eNB is provided an indication from which the eNB can deduce which frequencies need to be avoided for UL CA.