Fragmentation extended subheader format IEEE 802 16 Presentation

Fragmentation extended subheader format IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE C 802. 16 m-09/0114 Date Submitted: 2009 -01 -05 Source: Whai-En Chen, wechen@niu. edu. tw National Ilan University Shiann-Tsong Sheu, Chih-Cheng Yang National Central University Kanchei (Ken) Loa, Yi-Hsueh Tsai, Chun-Yen Hsu, Youn-Tai Lee, Tsung-Yu Tsai, Chiu-Wen Chen, Yi-Ting Lin Institute for Information Industry *<http: //standards. ieee. org/faqs/affiliation. FAQ. html> Venue: IEEE 802. 16 m-08/052: Call for Comments on Project 802. 16 m System Description Document (SDD) Base Contribution: N/A Purpose: Propose a signaling MAC header for SDD Notice: This document does not represent the agreed views of the IEEE 802. 16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802. 16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

Motivation • In this contribution, we propose to remove packing extended header and add the format of fragmentation extended header (FEH) in order to carry the information of fragmented payload. • In IEEE 802. 16 m system, the size of generic MAC header (GMH) is reduced to 3 bytes. Thus, packing multiple MSDUs of different sizes into one PDU becomes unnecessary, but the fragmentation of MSDU is required to optimize the channel utilization. • Because a PDU only contains one fragmentation, the length information of fragmentation is implicitly indicated by the length field of generic MAC header and can be omitted in fragmentation extended header.

Example of Short Fragmentation Extended header • FC (fragmentation control): FC is used to indicate the last fragment • SN (6): MSDU sequence number • FSN (3) : Fragmentation sequence number

Example of Long Fragmentation Extended header • FC (fragmentation control): FC is used to indicate the last fragment • SN (11): MSDU sequence number • FSN (6) : Fragmentation sequence number

Proposed SDD Text • 10. x. 2. 1 Fragmentation and packing extended header IEEE 802. 16 m supports MSDU fragmentation. Each MPDU contains either a full MSDU or a fragmented MSDU. The fragmentation extended header should include the following fields : l Frame control (FC): FC is used to indicate the last fragment. l Sequence number (SN): SN is used to indicate the sequence number of MSDU. l Fragmentation sequence number (FSN): FSN is used to indicate the fragmentation sequence number of MSDU.