Inter-Modulation Distortion Query for 5G Base Station Frequency Band Configuration
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Solution Overview
Problem
In 5G network deployment using the NSA method, UE experiences severe Inter-Modulation Distortion (IMD) during simultaneous uplink transmission on multiple frequency bands, particularly affecting LTE and NR frequency bands below 6 GHz, leading to reduced performance and increased signaling overhead when reporting capable frequency band combinations.
Innovation Solution
A method and device where a base station queries the UE about potential IMD on specific frequency band combinations during configuration, allowing the UE to feedback determination results via RRC signaling, enabling the base station to configure uplink and downlink transmissions on alternative frequency bands to avoid IMD, thereby reducing signaling overhead and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE capability reporting method is adopted to enable the UE to report its capabilities to the base station, then the base station can obtain information about supported frequency band combinations, but the UE needs to report all the frequency band combinations which can be supported by itself during the attach stage, which will cause a large signaling overhead
Solution Approach 1:
The patent extracts only the necessary information (IMD-prone frequency band combinations) from the complete UE capability set, rather than requiring reporting of all supported combinations. The base station queries specifically about IMD issues on certain frequency band combinations, and the UE reports only those combinations that may generate IMD, significantly reducing signaling overhead while maintaining adaptability.
Solution Approach 2:
The patent implements preliminary action by having the base station query the UE about potential IMD issues before actual frequency band configuration occurs. The query is sent during the connection establishment phase, allowing the UE to prepare and report IMD information in advance, so that the base station can make informed configuration decisions without requiring comprehensive capability reporting.
2Productivity
If the UE performs uplink transmission on two frequency bands at the same time, then the communication links are maintained, but it may cause severe Inter-Modulation Distortion (IMD) for downlink reception in a certain frequency band, thereby reducing the performance of the UE
Solution Approach 1:
The patent implements feedback mechanism where the UE reports IMD information to the base station regarding specific frequency band combinations. The base station uses this feedback to make informed decisions about uplink frequency band configuration, avoiding combinations that would cause severe IMD and thereby maintaining both productivity and reliability.
Solution Approach 2:
The patent applies preliminary anti-action by having the base station query and identify IMD-prone frequency band combinations before configuring simultaneous uplink transmissions. The base station proactively avoids configuring frequency bands that would generate severe IMD, preventing the distortion issue before it occurs while still maintaining communication links.
Data Source
AI summary
A method for indicating inter-modulation distortion (IMD) includes: sending a query request to user equipment (UE) when a second base station is to be configured for the UE, the query request being used for querying whether IMD will be generated for downlink reception when the UE simultaneously performs uplink transmission on a uplink frequency band combination to be configured by a first base station and the second base station; receiving a determining result fed back by the UE according to the query request; and configuring uplink transmission and downlink reception for the UE on a corresponding frequency band according to the received determining result. As such, signaling overhead of a system can be greatly reduce, and the occurrence of IMD can be avoided.