Re: [STDS-802-11-TGM] Do STAs inherit or aggregate PHYs?
--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---
Mark,
I see the wording you mean, but to me that wording does exactly what I thought. That is, when the ERP PHY builds on DSSS/CCK, for example, that means you could view/model this as the ERP PHY "containing" the DSSS/CCK PHY, or as the ERP PHY being implemented by including all the implementation of the DSSS/CCK PHY as an integral part of the ERP PHY. But, either way, it isn't "a STA with multiple PHYs" in the sense of those PHYs being side-by-side and accessible to the MAC. The MAC sees one PHY. What that PHY does internally is not visible or of interest to the MAC.
Of course, 11ad complicates all this. Note, though, that this allows multiple MACs to share a single PHY. In this case, we have multiple STAs but only one PHY between them. It carefully never talks about allowing more than one PHY accessed by a given MAC entity.
Mark
-----Original Message-----
From: Mark Rison [mailto:m.rison@xxxxxxxxxxx]
Sent: Friday, November 16, 2012 1:51 PM
To: Hamilton, Mark
Cc: STDS-802-11-TGM@xxxxxxxx
Subject: Do STAs inherit or aggregate PHYs?
Hello Mark,
You asked me to explain why it's not clear to me whether the ERP includes the DSSS PHYs' functionality or adds to them (and ditto the HT PHY and the HR/DSSS PHY w.r.t. their predecessors).
I think the problem is wording like:
- "The ERP builds on [DSSS/CCK]" in 19.1. "builds on" to me suggests to me that the foundations are owned by someone else -- think of it as freehold v. leasehold!
- "[HR/DSSS] builds on [DSSS]" in 17.1 (ditto)
- "In addition to [Clause 20], an HT STA shall be capable of transmitting and receiving frames that are compliant with [Clause 18 and/or 17 and 19]" in 20.1. Note the HT *STA* is capable, but is this done by the HT *PHY* or by having multiple PHYs?
Mark
--
Mark RISON, Systems Architect, Wi-Fi English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0ZT Fax: +44 1223 TBCTBC
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