Re: [STDS-802-16] Question regarding feedback request extended subheader

[Mina Sokar <msokar@SYSDSOFT.COM>]

Dear Chi-Chen lee,

 

The feedback request extended sub-header is sent by the BS to allocate a normal data allocation. The MS uses this data allocation to send a 6-bytes feedback header. The format of the feedback header to be transmitted is defined in 6.3.2.1.2.2.1. It is different from the FAST-FEEDBACK allocation subheader (6.3.2.2.6) which sent by the BS to allocate a fast-feedback allocation. Moreover, the feedback request extended sub-header specifies a single allocation, not a periodic allocation.

 

I think the repetition coding indication is missing in the feedback request extended sub-header.

 

Best Regards,

 

Mina Sokar

--

Mina Sokar,

System Engineer, Embedded Wireless Systems

SySDSoft Inc.

www.sysdsoft.com

 

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From: Chi-Chen lee < ChiChen_Lee@mtk.com.tw>
Date: Jul 12, 2007 7:42 AM
Subject: [STDS-802-16] Question regarding feedback request extended subheader
To: STDS-802-16@listserv.ieee.org


Dear 802.16 working group members,

Section 6.3.2.2.7.3 and table 13f on 802.16-2005e define the feedback request extended subheader.  We have some issues to be clarified:

1. This subheader is sent by the BS in order to provide UL allocation for a fast-feedback channel transmission. There are 3 fields in the subheader format described on table 13f which are irrelevant for fast-feedback allocation. They are the "OFDMA Symbol offset", "Subchannel offset" and "No. slot". We believe a more suitable definition for fast-feedback channel transmission will be similar to CQICH allocation defined on table 300. It shall include for instance a 6 bit field of "Allocation offset" to the fast-feedback channel region, a "Period" field etc.
2. In case the spec for this subheader remains without the "Allocation offset" field, should the fast-feedback subheader also be sent when the feedback request extended subheader is sent in order to allocate a slot on the fast-feedback channel?
3. Is it correct that the "Frame Offset" indicates the allocation applied to a frame ahead of the current one? A better definition will be similar to the CQICH where 3 bit "Frame offset" is defined: "The SS starts reporting at the frame of which the number has the same 3 LSB as the specified frame offset. If the current frame is specified, the SS should start reporting in eight frames"

Thanks,

=================================
Chi-Chen Lee
Software Development Department
WiMAX Development Division
MediaTek Inc.

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