LTE RAN Sharing via PLMN ID Mapping for CSFB
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Solution Overview
Problem
Current LTE technologies face challenges in efficiently transitioning between cells and enabling multiple HRPD operators to share a radio access network, particularly in handling circuit-switched fallback procedures and distinguishing between different HRPD subnet identifiers in a shared LTE network.
Innovation Solution
The implementation of a system and method that allows for the selection and mapping of PLMN IDs to SIDs and NIDs within the LTE RAN, enabling CSFB procedures and session transfer operations by distinguishing between different HRPD subnet identifiers, and managing network information for multiple CDMA2000 networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple HRPD operators share an LTE RAN, then network resource utilization is improved, but network identification and selection complexity increases
Solution Approach 1:
The patent segments the network identification system by introducing distinct PLMN ID structures for different HRPD operators sharing the LTE RAN. Each operator is assigned unique PLMN identifiers, allowing the system to divide the shared network into logically separate operator domains. This segmentation resolves the contradiction by enabling multiple operators to coexist in the shared infrastructure while maintaining clear identification boundaries.
Solution Approach 2:
The patent introduces PLMN ID mapping tables and selection mechanisms as intermediary layers between the LTE RAN and HRPD networks. These intermediaries translate between LTE's PLMN identification system and HRPD's network identification requirements, enabling seamless multi-operator support without directly exposing the complexity of network sharing to user equipment.
2Measurement precision
If PLMN ID mapping is implemented for multiple CDMA2000 networks, then network selection accuracy is improved, but information processing overhead increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring PLMN ID mapping tables in the network and user equipment before actual network selection occurs. The mapping relationships between PLMN IDs and CDMA2000 network identifiers are established in advance, allowing rapid and accurate network selection without requiring complex real-time processing. This eliminates the need for extensive information processing during runtime while maintaining high selection accuracy.
3Reliability
If CSFB procedures are enhanced with PLMN ID selection, then call setup reliability is improved, but signaling message complexity increases
Solution Approach 1:
The patent applies universality by designing the PLMN ID selection mechanism to serve multiple functions simultaneously. The same PLMN ID selection process supports both network selection and CSFB procedures, eliminating the need for separate identification mechanisms. This multi-functional approach improves call setup reliability while avoiding the proliferation of specialized signaling messages for each function.
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided in which user equipment performs a circuit-switched fallback procedure to connect to a CDMA2000 network. The CDMA2000 network may be selected by the UE or by the network. A plurality of PLMN IDs may be maintained, where the IDs relate to a network that includes an LTE RAN. Each PLMN ID may be associated with a CDMA2000 network sharing the LTE RAN. A CDMA2000 network may be selected for circuit-switched fallback of a user equipment operating in the LTE RAN. The user equipment may be configured to perform a circuit-switched fallback procedure on the selected CDMA2000 network. The CDMA2000 network may be selected by a mobility management entity responsive to a PLMN selection procedure. The PLMN selection procedure may be performed when the UE reports multiple-operator capability.