1. doc.: IEEE 802.15-<doc#>
<month year>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Resolution for Sponsor Ballot FEC Comment]
Date Submitted: [September, 2011]
Source: [Liru LU (Alina), Hiroshi HARADA, Fumihide KOJIMA, and Chin-Sean SUM]
Company [NICT]
Address [3-4, Hikarino-oka, Yokosuka, , Japan]
Voice: [ ], FAX: [ ],
Re: []
Abstract: [This document provides resolutions to comments for FEC]
Purpose: [This document provides resolutions to comments of g Sponsor Ballot]
Notice: This document has been prepared to assist the IEEE P 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 P
<author>, <company>

2. FEC CID 240
Comment:
The operation specified in Figure 115 is broken when both FEC and whitening are simultaneously enabled. The receiver does not know in advance whether or not whitening is used since whitening is signaled with the DW bit in the header (PHR). The FEC block must be placed after the data whitening block in transmit. Equivalently, the FEC block must be placed in front of the whitening block in receive.
Proposed change: In Figure 115 make a first concatenator which concatenates the PHR and PSDU. Move the FEC and bypass after the first concatenator. Then make a second concatenator which concatenates the SHR and output of the FEC or bypass. Move the data whitening text ahead of the FEC text, and make the corresponding changes in the text to match the updated figure.
[Schmidl, Timothy]
Response: Revised
Reason: Move DW bit to the second control bit position in the PHR after the Mode Switch bit, to allow a traceback length of 14, which can be deemed sufficient for K=4, see document Move the FCS field in the third position and make the 4th and 5th bits Reserved, followed by the 11 bits Frame Length.