RFC 9510 - Alternative Delta Time Encoding for Content-Centric Networking (CCNx) Using Compact Floating-Point Arithmetic

Status: Experimental
Published: February 2024
Updates: RFC 8609

Abstract

Content-Centric Networking (CCNx) utilizes delta time for a number of functions. When using CCNx in environments with constrained nodes or bandwidth-constrained networks, it is valuable to have a compressed representation of delta time. In order to do so, either accuracy or dynamic range has to be sacrificed. Since the current uses of delta time do not require both simultaneously, one can consider a logarithmic encoding. This document updates RFC 8609 ("CCNx messages in TLV Format") to specify this alternative encoding.

This document is a product of the IRTF Information-Centric Networking Research Group (ICNRG).

Contents

• 1. Introduction
• 2. Terminology
• 3. Usage of Time Values in CCNx
  • 3.1 Relative Time in CCNx
  • 3.2 Absolute Time in CCNx
• 4. A Compact Time Representation with Logarithmic Range
• 5. Protocol Integration of the Compact Time Representation
  • 5.1 Interest Lifetime
  • 5.2 Recommended Cache Time
• 6. IANA Considerations
• 7. Security Considerations
• 8. References
  • 8.1 Normative References
  • 8.2 Informative References
• Appendix A. Test Vectors
• Appendix B. Efficient Time Value Approximation