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Discussion on LI Requirements for Nomadic and Mobile HNBs

This paper discusses the location requirements for Lawful Interception (LI) scenarios applicable to Nomadic and Mobile Home NodeB (HNB) use cases. It explores the challenges and necessary mechanisms for detecting and securely updating the HNB location in a timely manner.

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Discussion on LI Requirements for Nomadic and Mobile HNBs

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  1. 3GPP/SA3-LI#41 Tdoc SA3LI11_085 Philadelphia, 10-12 May 2011 Discussion on LI Requirements for Nomadic and Mobile HNBs Source: Rogers Wireless Contact: George Babut

  2. Paper Objectives • This discussion paper discusses the location requirements for LI scenarios applicable to Nomadic and Mobile Home NodeB use cases Discussion on Nomadic/Mobile HnB LI

  3. Introduction • Deployment of HNBs • Fixed • Nomadic • Mobile Discussion on Nomadic/Mobile HnB LI

  4. Nomadic HNB • Nomadic HNB • This may be an operator policy, allowing the subscriber to move HNB from home, office, to cottage, temporary residences (university), or used on business travel (to allow multiple devices to connect as in personal WiFi, or for use in business meeting with associates) • Definition of “Nomadic” mode • Essentially a “fixed” operation mode, while being in a given fixed location, movable from one location to another, but not operational while moving from one location to another Discussion on Nomadic/Mobile HnB LI

  5. Mobile HNB • Mobile HNB • Target attaches the HNB to a Mobile Broadband service, for example: • private access to my bus, to reduce cost of several users with respect to mobile service or as I move my HNB from home to cottage; • or on a train, where operators have sufficient spectrum, this mode may enhance handover of many users at once while in one IPSEC tunnel, ie one session versus many • This is not the anticipated state for HNB, but for operators that allow nomadic operation, operator policies may not catch this operation and may allow this use case to occur. • The Public IP address from the mobile Broadband service is not changing • Definition of “Mobile” mode • A “full” operation mode, while being in a given fixed location, movable from one location to another, and fully operational while moving from one location to another • Some operators may wish to actually use HnB as picocells on trains Discussion on Nomadic/Mobile HnB LI

  6. Location for Mobile HNB • Now the location of the HNB is variable during its normal operation • Location of a target on the HNB becomes an issue • Any targets on the HNB may not report correctly their location • A fast enough location update to keep up with this HNB mobility might be required, depending upon the national LI requirements Discussion on Nomadic/Mobile HnB LI

  7. Conclusions • We need to ensure that: • there are mechanisms that can detect changes in location for the HnB, and • that the HNB location is securely updated with trusted information in a timely manner that meets national authority requirements. Discussion on Nomadic/Mobile HnB LI

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