LTE Packet Data Convergence Protocol (PDCP) - EventHelix.com

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EventHelix.com • telecommunication design • systems engineering • real-time and embedded systems 3GPP LTE Packet Data Convergence Protocol (PDCP) Sub Layer ROBUST HEADER COMPRESSION © 2009 EventHelix.com Inc. 6
RoHC Modes EventHelix.com • telecommunication design • systems engineering • real-time and embedded systems Unidirectional Mode (U-Mode) •Packets are only sent in one direction: from compressor to decompressor. •This mode therefore makes ROHC usable over links where a return path from decompressor to compressor is unavailable or undesirable. Bidirectional Optimistic Mode (O-Mode) •Similar to the Unidirectional mode, except that a feedback channel is used to send error recovery requests and (optionally) acknowledgments of significant context updates from the decompressor to compressor. •The O-mode aims to maximize compression efficiency and sparse usage of the feedback channel. Bidirectional Reliable Mode (R-Mode) •More intensive usage of the feedback channel and a stricter logic at both the compressor and the decompressor that prevents loss of context synchronization between compressor and decompressor. © 2009 EventHelix.com Inc. 7
Page 1 and 2: EventHelix.com • telecommunicatio
Page 3 and 4: PDCP in the LTE Protocol Stack Even
Page 5: PDCP Layer Functions EventHelix.com
Page 9 and 10: RoHC Compressor States in Unidirect
Page 11 and 12: RoHC Compressor States in Bidirecti
Page 13 and 14: EventHelix.com • telecommunicatio
Page 15 and 16: User Plane PDCP PDUs EventHelix.com
Page 17 and 18: PDCP PDU Fields 2 EventHelix.com
Page 19 and 20: Explore More EventHelix.com • tel

LTE Packet Data Convergence Protocol (PDCP) - EventHelix.com

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