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Understanding Location-Based Value (LbyV) and Recipient (LbyR) Information Exchange

This document explores the definitions and mechanisms of Location-Based Value (LbyV) and Location-Based Recipient (LbyR) frameworks for location information exchange. It discusses how consumers of location information (LbyR) use URLs to obtain location values and how targets or proxies (LbyV) deliver these values through signaling paths. Key issues addressed include insertion, updates for mobile targets, reliability, privacy policies, and overhead. The text examines the implications of in-band privacy configurations and encryption methods ensuring data integrity in various scenarios.

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Understanding Location-Based Value (LbyV) and Recipient (LbyR) Information Exchange

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  1. LbyV and LbyR Henning Schulzrinne

  2. Definition • LbyR • Consumers (recipients) of location information resolves URL and obtains location value • LbyV • Target (or proxy) inserts & delivers location value to all or some consumers in signaling path • LbyV-plain: as-is • accessibility the same as carrying protocol (say, SIP) • LbyV-SMIME: encapsulated in S/MIME • Targeted to one (logical) receiver

  3. Scenarios LIS V or R V or R V LoST

  4. Issues • Insertion • Updates if target moving • Size/overhead • Mid-stream insertion • Privacy policies • Reliability • Security • Encryption • Integrity

  5. Insertion • LbyV • Can be inserted by end system • Can be inserted by proxy • Via data: URL in header • LbyR • Same • Via header addition • Same issues for privacy policies

  6. Privacy policies • Whenever LO is generated by third party, unclear how in-band privacy policies are configured • generator may not know intended use (pizza delivery vs. emergency call) • Issue for LbyR or LbyV proxy-insertion • may be solvable by configuration mechanism

  7. Updates for moving targets • LbyV • Target has to push (UPDATE, re-INVITE) • But it knows when location has changed significantly • May be difficult if inserted by proxy • LbyR • Receiver polls LIS or subscribes to LIS or target • Polling: may not know when location is changing

  8. Reliability • LbyR • Recipient needs protocol transaction to get LO • Thus, two points of failure • Impact on reliability depends on relative failure probabilities of the two parts • LbyV • “fate sharing”: no signaling without location • Thus, one point of failure

  9. Overhead • LIS likely close to target • Details depend on assumptions • Cost of one hop is constant or distance-dependent • LbyR: Each retrieval one additional protocol exchange • With headers, TCP setup, TLS, as applicable • LbyV: • Additional LO in message

  10. Access control • LbyR • Anybody who has access to reference • Unless • desired recipient has a security relationship with LIS AND • rule maker can access authorization upload policies to LIS • LbyV • Anybody who has access to value • Unless • Target can encrypt value for recipient • Single target: S/MIME, encrypted with recipient’s public key

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