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


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,

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

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