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Header Compression

Learn about a scheme to compress dynamic fields in 802.11ah MAC header, optimizing transmission efficiency. Explore compression protocols, solutions, and synchronization methods presented by Shoukang Zheng et al. from I2R, Singapore.

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Header Compression

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  1. Header Compression Authors: Date: 2012-05-13 Shoukang Zheng et. al, I2R, Singapore

  2. Abstract In this contribution, we present the scheme to compress the dynamic fields in MAC header in 802.11ah. Shoukang Zheng et. al, I2R, Singapore

  3. Motivation • In 802.11ah use cases, low data rate requires header compression for efficient transmission. • Constant fields in MAC header can be compressed • MAC address • Constant in the Control fields • Dynamic fields in the header may be also compressed • Sequence number • PN (packet number) in CCMP header Shoukang Zheng et. al, I2R, Singapore

  4. Problems • Header compression protocol must be simple with small overhead • Proposed scheme [1] uses some management exchange to set up the context for compression. Other method is suitable as well. • How to compress the dynamic field compression efficiently? Shoukang Zheng et. al, I2R, Singapore

  5. Suggested Solution • Compression/Decompression Context Setup • Initial value as the base for dynamic field • The range of compressed value is [0,Vmax] • Compression • Use fewer bits • Only compressed value (bits) is transmitted after context setup • # of compressed bits: log2(Vmax+1) • Decompression • Compressed value + Initial value • Context Update • Re-synchronize the initial value of dynamic field Shoukang Zheng et. al, I2R, Singapore

  6. Dynamic Field Compression • Sequence Number (12 bits) • Use fewer bits (e.g. 4 bits) for low data rate • PN0-5 fields in CCMP header • Use fewer bits (e.g. 4 bits) • PN incremental value fixed as 1 (highest compression ratio) Shoukang Zheng et. al, I2R, Singapore

  7. Synchronizing Context • When compression side detects that decompression is out of synchronization on initial value of dynamic field, compression side can update the context • When decompression side detects that it is out of synchronization on initial value of dynamic field, decompression side can request to update the context Shoukang Zheng et. al, I2R, Singapore

  8. Conclusions • We propose to support dynamic field compression for MAC header Shoukang Zheng et. al, I2R, Singapore

  9. References • [1] “Frame Header Compression”,11-12-0110-06-00ah-frame-headercompression.pptx • [2] “MAC Header Compression”, 11-12-0369-01-00ah-mac-headercompression.pptx Shoukang Zheng et. al, I2R, Singapore

  10. Straw Poll (1) • Do you agree that dynamic field (sequence number and PN0-5 fields) can be compressed as in slide 5? • Y: • N: • A: Shoukang Zheng et. al, I2R, Singapore

  11. Straw Poll (2) • Do you agree that sequence number field can be compressed as in slide 6? • Y: • N: • A: Shoukang Zheng et. al, I2R, Singapore

  12. Straw Poll (3) • Do you agree that PN (packet number) in CCMP header can be compressed as in slide 6? • Y: • N: • A: Shoukang Zheng et. al, I2R, Singapore

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