VHTL6 Throughput Metric Thoughts May 2008 doc.: IEEE 802.11-08/0499r0 May 2008 VHTL6 Throughput Metric Thoughts Date: 2008-05-01 Authors: Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

May 2008 doc.: IEEE 802.11-08/0499r0 May 2008 Abstract A presentation of possible directions for the development of a throughput metric for the VHTL6 effort. Please view in slideshow mode to see animations. Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

Outline Objectives Throughput Metrics Naming the Metric M1 M3 M4 May 2008 Outline Objectives Throughput Metrics M1 M3 M4 Naming the Metric Darwin Engwer, Nortel Networks

VHTL6 Throughput Metric Objectives May 2008 VHTL6 Throughput Metric Objectives From previous discussions: A BSS peak aggregated throughput of at least 1Gbps as measured at the MAC data service access point (SAP). Zero or more overlapping BSSs and Direct Links (DLs), with at most one infrastructure BSS. Darwin Engwer, Nortel Networks

VHTL6 Throughput Metric Objectives May 2008 VHTL6 Throughput Metric Objectives From previous discussions: A BSS peak aggregated throughput of at least 1Gbps as measured at the MAC data service access point (SAP). Zero or more overlapping BSSs and Direct Links (DLs), with at most one infrastructure BSS. The later is difficult to characterize as stated. Since we are seeking a peak or maximum value the second requirement can be restated as: One or more overlapping BSSs and Direct Links (DLs), together with one infrastructure BSS. Darwin Engwer, Nortel Networks

Analytical Scenario I Consider a universe; a void with nothing in it. May 2008 Analytical Scenario I Consider a universe; a void with nothing in it. In the middle of this void, place an AP with a set of associated STAs communicating with the AP. The AP is a point of access to a non-802.11 LAN of infinite capacity (through a DS and portal, not shown). A constellation of n STAs is associated with the AP. Each STA is attempting to exchange a maximum amount of data with an entity x on the non-802.11 LAN. The entity x has infinite throughput capacity. Darwin Engwer, Nortel Networks

A single AP in a void May 2008 May 2008 doc.: IEEE 802.11-08/0499r0 AP STA AP With a constellation of associated and active MUs. Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

Infrastructure BSS Maximum Throughput (M1) May 2008 Infrastructure BSS Maximum Throughput (M1) Collectively the AP and the set of STAs are capable of some MAXIMUM throughput. STAs BSS Throughput Max 1 2 3 4 5 Note: Data is for illustration purposes only. Darwin Engwer, Nortel Networks

Infrastructure BSS Maximum Throughput May 2008 Infrastructure BSS Maximum Throughput where, i = index of current STA n = number of associated and active STAs T = throughput at MAC SAP of STA i of n Darwin Engwer, Nortel Networks

Analytical Scenario II May 2008 Analytical Scenario II Consider a universe; a void with nothing in it. In the middle of this void, place an AP with a set of associated STAs communicating with the AP. The AP is a point of access to a non-802.11 LAN of infinite capacity (through a DS and portal, not shown). A constellation of n STAs is associated with the AP. Each STA is attempting to exchange a maximum amount of data with an entity x on the non-802.11 LAN. The entity x has infinite throughput capacity. Collocated with the above are one or more sets of directly communicating STAs (either IBSS or DL). Darwin Engwer, Nortel Networks

A single AP with multiple sets of DL STAs May 2008 doc.: IEEE 802.11-08/0499r0 May 2008 A single AP with multiple sets of DL STAs STA STA AP With a constellation of associated and active MUs. STA Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

May 2008 DL Throughput Factor Since we already have a metric for the infrastructure BSS throughput (M1), let’s consider the IBSS/DL throughput, M3: Collocated with the above are one or more sets of directly communicating STAs (either IBSS or DL). Darwin Engwer, Nortel Networks

Multiple DL Maximum Throughput (M3) May 2008 doc.: IEEE 802.11-08/0499r0 May 2008 Multiple DL Maximum Throughput (M3) where, i = index of current STA n = number of associated and active STAs j = index of current DL/IBSS set m = number of DL/IBSS sets k = number of channels T = throughput at MAC SAP of STA i of n wrt DL/IBSS set j of m (j, m+1, k determine number of sets on current channel) Note that a given *system* might employ multiple bands, e.g. dual concurrent 11b + 11a. Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

May 2008 Combined Metric where, all infrastructure mode and DL/IBSS STAs are located in the same BSA. Darwin Engwer, Nortel Networks

Naming the Metric “BSS Peak Aggregated Throughput” ? May 2008 Naming the Metric “BSS Peak Aggregated Throughput” ? “Max BSS Throughput” ? But the M4 metric as refined doesn’t really have anything to do with a specific BSS. Instead the metric establishes the maximum throughput possible in a given area/volume. Thus it may be more appropriate to speak of the metric wrt the BSA: “Maximum BSA Throughput” ? Darwin Engwer, Nortel Networks

May 2008 BSA Definition (for 802.11-2007) 3.15 basic service area (BSA): The area containing the members of a basic service set (BSS). It may contain members of other BSSs. Darwin Engwer, Nortel Networks

Can we Agree on the metric? Agree on the name for the metric? May 2008 Darwin Engwer, Nortel Networks

May 2008 References “Mobile Cooperation Usage Models”, IEEE 802.11 submission, 2008-01-13, Marc de Courville (Motorola) et al. 11-08-0081-02-0vht-mobile-cooperation.ppt “Below 6 GHz 11VHT PAR&5C’s Proposal”, IEEE 802.11 submission, 2008-03-17, Marc de Courville, Darwin Engwer et al. 11-08-0219-04-0vht-below-6ghz-11vht-par-5c-s-proposal.ppt 11-08-0465-02-0vht-vht-metrics-considerations.ppt 11-08-0464-01-0vht-below-6ghz-11vht-par-scope-and-purpose-discussion.ppt IEEE Std. 802.11-2007 Darwin Engwer, Nortel Networks

Revisions r0 – 2008-05-01 For first presentation to VHT SG. May 2008 Revisions r0 – 2008-05-01 For first presentation to VHT SG. r1 – 2008-05-12 s13: Corrected range of ‘n’ parameter to start at ‘2’ since an IBSS or DL by definition must include at least 2 STAs; channel factor depends on “m+1” rather than “m” (because the infrastructure BSS will use one channel). Darwin Engwer, Nortel Networks

May 2008 Backup Slides Darwin Engwer, Nortel Networks