View
220
Download
0
Category
Preview:
Citation preview
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)Slide 1Slide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Networks (WPANs)
Submission Title: Symbols or time for SUN PHYsDate Submitted: January 2011Source: James GilbContact: James GilbVoice: 858-229-4822, E-Mail: last name at ieee dot orgRe: d2P802-15-4g_Draft_Standard.pdf, LB62Abstract: 802.15.4 MAC timing is based on symbols. However, the SUN PHYs use
multiple symbol rates in a single band and have some timing specified in units of seconds.
Purpose: Resolve comments in LB62.Notice: This document has been prepared to assist the IEEE P802.15. It is offered
as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
Introduction• The 802.15.4 MAC bases all timing on
symbols– e.g., superframe duration, slot duration,
minimum CAP size.
• The SUN PHYs allow multiple symbol rates (and hence symbol durations) in a single band.
• Some of the SUN PHY timing parameters are currently specified in seconds
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
Comments addressed• 234, 372, 683, 918, 921, 1155
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
Significance of timing• The LR-WPAN needs known timing
– Superframe duration, CAP duration, etc. all depend on it.
– Every device needs to use the same timing.
– Otherwise, synchronization issues
• For MAC, best is to use a common unit for describing time– In some standards, a time unit (TU)– In 802.15.4, it is the symbol
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC constants
No changes should be needed for the above constants.
This probably needs to have a different value for SUN PHYs
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC PIB attributes
Need to add the calculations for the SUN PHYs to 5.1.6.4.2
No change required at this location.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC PIB attributes (cont.)
No change required at this location.
No change required at this location.
No change required at this location.
No change required at this location.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC primitivesMLME-BEACON-NOTIFY.indication
UWB related, no change required.
No change required at this location.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC primitives (2)
No change required for either of these at this location.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC primitives (3)
No change required at this location.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
MAC primitives
No change required at this location.
UWB related, no change required.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
General PHY requirements
4g should verify that this detection period is correct and modify if necessary.
These will likely be different for SUN PHYs, perhaps different in some bands
Doesn’t apply to 4g, used for LBT PHYs
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
PHY constants and PIB attributes
4g will probably need to alter this one, i.e. “for SUN PHYs …”
Should be fine
Does the next three need to be a list of values, each entry corresponding to a different data rate?
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
PHY PIB attributes
phyCCADuration only applies to 905 MHz PHYs that need to do a special listen before talk.
phyUWBInsertedPreambleInterval only applies to UWB PHYs, no change required for 4g.
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
Suggested resolution• Keep timing in symbols.
– Clarify that in the MAC clause, symbol means the symbol duration at the lowest mandatory rate, i.e., the longest mandatory symbol duration.
• Use symbols for SUN PHY timing– Translate all SUN PHY timing parameters
into symbols at the lowest mandatory rate
doc.: IEEE 15-11-0110-00-004g
TG4g
January 2010
James Gilb (self)
Resolution text• Add to Clause 5
– “For the SUN PHYs, the symbol duration used for MAC and PHY timing parameters shall be the symbol duration of the lowest data rate mandatory mode each band. For the generic PHY, this corresponds to the lowest data rate defined for that generic PHY.”
• Add cross references at other locations (e.g., Clause 8, Clause 9), i.e.– “For the SUN PHYs, the meaning of a symbol
duration for timing parameters is described in 5.1.”
Recommended