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Doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 1 Coding of Extended Supported Rates IE January 2003 Gunnar.

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Presentation on theme: "Doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 1 Coding of Extended Supported Rates IE January 2003 Gunnar."— Presentation transcript:

1 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 1 Coding of Extended Supported Rates IE January 2003 Gunnar Nitsche Philips Semiconductors

2 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 2 Introduction It has been shown that the supported rates IE cannot be extended to contain more than 8 rates (3 LB50 comments) There seems to be consensus that a new IE is necessary to carry additional supported rates Although not strictly necessary, creating a new IE gives the oppurtunity to define a more future-proof coding of the rates

3 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 3 Problems of current coding MSB for signalling member of basic rate set, 7 bits for coding rate in steps of 500 kbit/s –63.5 Mbit/s maximum, so we are already at the end There is an ambiguity between same rates at different modulation schemes –802.11b: 5.5 / 11 Mbit/s CCK versus PBCC –802.11g: all ERP-OFDM versus DSSS-OFDM rates

4 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 4 Ideas for new coding (1) 1.Use 1 Mbit/s step size –works up to 127 Mbit/s 2.Use 16 bit numbers times 500 kbit/s –practically unlimited

5 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 5 Ideas for new coding (2) 3.Use tagged format, e.g. –1 bit for member of basic rate set –7 bits for modulation (e.g. 0 = FH, 1 = DSSS/CCK, 2 = PBCC, 3 = ERP-OFDM, 4 = DSSS-OFDM) –8 bits for actual rate with modulation dependent coding Tagging solves the ambiguity problem, should be within our PAR

6 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 6 Straw poll 1 Do you want to have a new rate coding in the extended supported rates element? –yes –no

7 doc: IEEE 802.11-03/106r0 Submission January 2003 Gunnar Nitsche, Philips SemiconductorsSlide 7 Straw poll 2 What kind of new rate coding do you support (multiple votes allowed) ? 1.1 Mbit/s step size 2.16 bit numbers times 500 kbit/s 3.Tagged format

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