ETSI TS 101 671: foundational handover model
ETSI TS 101 671 is a foundational handover specification that established concepts still visible in later work. It is important for vocabulary, legacy interoperability, and understanding HI2/HI3, but implementers must verify whether a newer technology-specific or IP-delivery specification applies.
Safety boundary: this chapter teaches lawful, governed system design from public standards. It does not provide operational targeting, activation, decryption, surveillance-evasion, or covert collection instructions.
The mental model
| Concept | Plain meaning | Control that must travel with it |
|---|---|---|
| Foundational model | Provides common LI handover concepts and terminology | Do not assume old edition equals current profile |
| Legacy interoperability | Supports installed systems and historical national profiles | Migration and coexistence require testing |
| IRI/CC separation | Distinguishes event information from communication content | Both remain sensitive |
| Handover semantics | Defines receiver-facing behavior and information | Service-specific standards may refine it |
| National parameters | Allows jurisdiction-specific information | Uncontrolled variation harms interoperability |
| Migration mapping | Relates legacy objects to modern delivery frameworks | Mapping must preserve meaning and evidence |
Apply it as a controlled workflow
- Identify why TS 101 671 is referenced in the applicable profile.
- Pin edition and dependencies rather than relying on the title.
- Map each required concept to the selected current delivery family.
- Document semantic differences and unsupported legacy fields.
- Run bilateral conformance and regression tests.
- Plan retirement where current profiles supersede legacy paths.
Evidence to demand
- The architecture marks the standard as foundational, active-by-profile, or superseded.
- Legacy translation is versioned and reversible for audit.
- No silent default fills legally material fields.
- Receiver acceptance is demonstrated with synthetic fixtures.
Failure to reason about
A vendor says its product is “101 671 compliant” but cannot name the edition, national profile, or supported services. The claim is not testable. Demand a precise conformance statement and evidence matrix.
Feynman check
This standard is an older map many newer maps learned from. Keep it when the road still uses it, but check the latest route before driving.