5G NR UE IDC Reporting for Targeted Interference Mitigation
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Solution Overview
Problem
Existing 5G NR technologies face inefficiencies in mitigating in-device coexistence (IDC) interference due to increasing carrier bandwidths, where simply specifying affected carrier bands is insufficient for the network to effectively manage self-interference, particularly in scenarios involving higher order carrier aggregation and bandwidths up to 400 MHz in FR2.
Innovation Solution
The UE provides detailed interference indications to the base station through RRC messages, including specific frequency ranges, BWPs, and modes associated with victim and aggressor transmissions, enabling the network to implement targeted interference mitigation measures such as BWP switching, RB allocations, and NLIC to minimize self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detailed interference indications including frequency ranges and BWPs are provided, then interference mitigation effectiveness is improved, but message complexity and processing overhead increase
Solution Approach 1:
The interference indication message is segmented into multiple distinct fields: frequency range indicators, BWP identifiers, victim reception identifiers, and aggressor transmission identifiers. This segmentation allows the network to process only the relevant portions of the message based on the specific interference scenario, reducing unnecessary processing overhead while maintaining comprehensive interference mitigation capability.
Solution Approach 2:
The UE performs preliminary analysis and classification of interference sources before constructing the interference indication message. By pre-identifying victim receptions and aggressor transmissions and organizing them into structured fields, the UE reduces the processing burden on the network side, enabling faster and more efficient interference mitigation without requiring complex real-time analysis.
2Reliability
If comprehensive interference information is reported, then network can implement targeted mitigation measures, but uplink signaling overhead increases
Solution Approach 1:
The interference indication message structure allows different fields to carry different levels of detail based on local requirements. Frequency range indicators provide coarse-grained information for broad mitigation, while BWP and specific reception/transmission identifiers provide fine-grained information for targeted mitigation. This hierarchical detail structure reduces overall signaling overhead by providing only the necessary level of specificity for each interference scenario.
Solution Approach 2:
The network can selectively process only the necessary portions of the interference indication message based on the severity and type of interference detected. For minor interference, only frequency range indicators may be processed, while for severe interference, the full detailed information including BWP and specific transmission/reception identifiers is utilized. This partial processing approach reduces uplink signaling overhead while maintaining the capability for comprehensive mitigation when needed.
Data Source
AI summary
A UE may transmit to a base station, and the base station may receive from the UE, via an RRC message, an IDC interference indication. The IDC interference indication may be associated with at least one victim reception or at least one aggressor transmission. The IDC interference indication may include at least one of a first frequency range associated with the at least one victim reception, information associated with the at least one aggressor transmission, a first requested BWP associated with the at least one victim reception, or a second requested BWP associated with the at least one aggressor transmission. The base station may identify at least one interference mitigation measure based on the IDC interference indication. The UE and the base station may communicate based on the at least one interference mitigation measure.