Multi-SIM 5G NR Registration via MCC-Based Band Scanning
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Solution Overview
Problem
Current wireless devices face challenges in efficiently registering with 5G New Radio (NR) standalone (SA) networks, especially when roaming outside their home public land mobile network (HPLMN), due to the need for full band scanning which is time-consuming and power-intensive.
Innovation Solution
A multi-subscriber identity module (SIM) wireless device is configured to perform a full band scan of frequencies supporting the first subscription if it fails to register with a 5G NR cell during an acquisition database (ACQ-DB) scan. The device then determines if a shared mobile country code (MCC) is received from the second subscription, and if it is different from the HPLMN's MCC. If so, the device stops the full band scan and scans only the 5G NR band associated with the shared MCC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full band scan is performed to ensure comprehensive network coverage detection, then network registration reliability is improved, but registration time and power consumption increase
Solution Approach 1:
The patent segments the frequency band scanning process into two phases: initial ACQ-DB scan using stored frequency information, and full band scan as fallback. This segmentation allows the device to attempt fast registration first using segmented frequency data, and only perform complete scanning if necessary, thus resolving the contradiction between reliability and time loss.
Solution Approach 2:
The patent applies preliminary action by pre-storing acquisition database (ACQ-DB) frequency information from home networks before roaming. This preliminary data preparation enables the device to skip time-consuming full band scans during roaming by using pre-collected frequency information, thereby reducing registration time while maintaining reliability through the fallback full scan mechanism.
2Reliability
If full band scan is performed to ensure comprehensive network coverage detection, then network registration reliability is improved, but power consumption increases
Solution Approach 1:
The patent segments the frequency band scanning process into two phases: initial ACQ-DB scan using stored frequency information, and full band scan as fallback. This segmentation allows the device to attempt fast registration first using segmented frequency data, and only perform complete scanning if necessary, thus resolving the contradiction between reliability and power consumption.
Solution Approach 2:
The patent applies preliminary action by pre-storing acquisition database (ACQ-DB) frequency information from home networks before roaming. This preliminary data preparation enables the device to skip power-intensive full band scans during roaming by using pre-collected frequency information, thereby reducing power consumption while maintaining reliability through the fallback full scan mechanism.
3Reliability
If band scanning is performed without filtering by MCC, then all possible networks are detected, but scanning efficiency decreases
Solution Approach 1:
The patent applies local quality by filtering frequency bands based on Mobile Country Code (MCC) matching. Instead of uniformly scanning all bands, the device selectively scans only those bands associated with the detected MCC, creating a localized, targeted scanning approach that improves efficiency while maintaining detection completeness for relevant networks.
Solution Approach 2:
The patent changes the scanning parameter from a static full-band approach to a dynamic MCC-filtered approach. By modifying the frequency band selection parameter based on the detected MCC, the system adapts the scanning range to match the actual roaming context, thereby improving scanning efficiency without compromising the ability to detect all relevant networks.
Data Source
AI summary
Embodiments include systems and methods for supporting registration in a fifth generation (5G) new radio (NR) (5GNR) standalone (SA) network by a processor of a multi-subscriber identity module (SIM) wireless device configured with a first subscription and a second subscription. Various embodiments may include determining whether the first subscription received a shared mobile country code (MCC) from the second subscription and the shared MCC is different than an MCC of a home public land mobile network (HPLMN) of the first subscription in response to preforming a full band scan of frequencies supporting the first subscription, and stopping the full band scan by the first subscription and scanning a 5GNR band associated with the shared MCC in response to determining that the first subscription received the shared MCC from the second subscription and the shared MCC is different than the MCC of the HPLMN of the first subscription.