Rich, Thanks for clearing the air on this one. Brad -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rich Comroe Sent: Tuesday, January 09, 2007 12:54 AM To: WISPA General List Subject: Re: [WISPA] churn,double play and why WLP is key - I finally understand it
Patrick, I agree with your engineer's description. But I'd argue the use of the word prioritization is incorrectly applied to Canopy. Canopy doesn't prioritize VoIP. Priority schemes infer media access preference. Canopy's separate pre-allocated partitions have nothing to do with prioritization as VoIP and general traffic do not compete for a common partition (they each have their own). VL uses prioritization (and uses the term correctly), as VoIP is given priority access (most likely by permitting access with a shorter time gap following other transmissions than general data ... thus VoIP grabs the media first). If VL claims to be the first to implement a VoIP priority it only depends whether anyone else has implemented a true priority scheme already. Canopy's is not a priority scheme in any sense of the term. Prioritization has the clear advantage (no pun intended). Canopy essentially divides the rf into subchannels which loses the ability to dynamically use the channel for in-vs-out, VoIP-vs-general, etc. As the 3rd party testing described, the VoIP call volume cited could only be achieved in a VoIP-only configuration. A true prioritization mechanism (such as embodied in VL) is far superior to pre-allocated partitions in so, so many ways. Rich ----- Original Message ----- From: Patrick Leary To: WISPA General List Sent: Monday, January 08, 2007 6:57 PM Subject: RE: [WISPA] churn,double play and why WLP is key - I finally understand it Gino, After you informed me of the way prioritization occurs in your solution, I asked one of our sharp engineers to articulate the differences to me. Here was his reply back and I'd be interested in your feedback: **** The [prioritization mechanism in the] ______ system is different than VL in the way it is deployed and the way it will deploy a priority network. With VL the bandwidth for the sector is totally dynamic, any direction demand can utilize the entire capacity of the base station. ______ pre-defines the amount up and down to the sector. Their implementation of the prioritization is stated for DSCP only where we can do it also for ToS. I am not sure if that is unique but keep it in the back of your head. Our WLP is also dynamic; where he stated that you specify the amount of bandwidth for the priority channel, our can/will fluctuate every microsecond during the communication. This will also happen independently in each direction. Because there is a potential for over subscription of prioritized traffic, VL also has an option to set aside some bandwidth for best effort traffic incase the provider creates too much prioritized traffic. This prevents the FTP from a customer from breaking during the high priority traffic times. **** Make sense? Patrick Leary AVP WISP Markets Alvarion, Inc. o: 650.314.2628 c: 760.580.0080 Vonage: 650.641.1243 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gino A. Villarini Sent: Monday, January 08, 2007 4:24 PM To: 'WISPA General List' Subject: RE: [WISPA] churn,double play and why WLP is key - I finally understand it Back home...ahhh to bad when it ends... Frankly , I don't know ... maybe has to due with the TDD system, next firmware release should improve overall pps capacity Gino A. Villarini [EMAIL PROTECTED] Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Leary Sent: Sunday, January 07, 2007 2:03 PM To: WISPA General List Subject: RE: [WISPA] churn,double play and why WLP is key - I finally understand it It does sound like a similar smart mechanism Gino -- I stand corrected. If this is who I assume it is though, then why do they report such low VoIP performance per SM and per AP? ...but don't answer any of this until after you leave Vail. Better that you should just enjoy your vacation. Sounds great. Patrick -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gino A. Villarini Sent: Sunday, January 07, 2007 9:37 AM To: 'WISPA General List' Subject: RE: [WISPA] churn,double play and why WLP is key - I finally understand it Well, I haven't replied to this earlier cause Im on vacation (skiing @ Vail ) but now, let me add some info... I don't want to get involved in a gear fight, but a brand x gear has a Per Sector prioritization of traffic. It works like this: You set the cpe to identify the traffic to be prioritized using Diffserv, ( it can be any type of traffic not just voip) Then you activate on the cpe the "high priority channel" option Set how much bandwidth this "high priority channel" would use And you are done, The Sector AP identifies all the cpes on the sector using this feature and assings them a 2nd slot of time for this traffic for each cpe, so cpe's using this feature have 2 slots of time to talk to the ap, 1 for priority traffic, the other for regural traffic. Sector wide , all high priority channels of all cpes have "priority" over regular cpes... So Patrick, what do you think.... Gino A. Villarini [EMAIL PROTECTED] Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Leary Sent: Saturday, January 06, 2007 12:59 AM To: WISPA General List Subject: RE: [WISPA] churn,double play and why WLP is key - I finally understand it I don't think so Gino, but I'm open to be proven wrong. Tell me who else can actually prioritize over the air sector wide. I'm talking about not just pushing out the voice first on any given CPE, I'm talking about ALL the CPE on a sector being able to send its que'd voice out before any CPE can release data into the sector? Patrick Leary AVP WISP Markets Alvarion, Inc. o: 650.314.2628 c: 760.580.0080 Vonage: 650.641.1243 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gino A. Villarini Sent: Friday, January 05, 2007 2:19 PM To: 'WISPA General List' Subject: RE: [WISPA] churn,double play and why WLP is key - I finally understand it Patrick, not to rain on you parade but you guys area actually 2nd on this RF prioritization feature.... Gino A. Villarini [EMAIL PROTECTED] Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Leary Sent: Friday, January 05, 2007 4:13 PM To: WISPA General List Subject: [WISPA] churn,double play and why WLP is key - I finally understand it ..So I'm here at our annual national meeting and our project manager is explaining the Wireless Link Prioritization feature available for BreezeACCESS VL. Frankly, it has always seemed esoteric to those of us non-technical types, but now I got and it is simple enough. First, I learned the statistical improvement in churn when a provider has double play VoIP + data customers. We have had a few CLECs report to us that with a single play model their churn is about 9%. Adding double play takes it down to close to 1%. This is critical to the business model because they said a 10% reduction in churn translates into about a 20% improvement in NPV per subscriber. That's obviously huge. So what's the WLP feature available in BreezeACCESS VL have to do with any of this? BreezeACCESS VL can already do QoS priority tagging of packets per CPE using layer 2 (802.11p), layer 3 (IP TOS, DSCP) or layer 4 (TCP/UDP port ranges common with Cisco, for example). That's good and already better than most brands of BWA gear. BUT, that's only PER CPE. In a typical situation, this does not help at all when multiple CPE are on a sector -- there is no prioritization at the RF level in unlicensed from any brand...until now. WLP (also called multimedia application prioritization) actually solves this and enables over-the-air prioritization for the first time in the industry. The translation for this is that BreezeACCESS VL can now deliver massive VoIP, up to 288 concurrent calls per sector with a MOS (mean opinion score - a rating of voice quality) of 4.1. That's a phenomenal quantity that is more than 10x our main competitor as spelled out in their own relevant VoIP document. So why not just use VL with firmware version 4.0 without getting the WLP feature? The WLP is the key to get the quantity AND THE QUALITY of service since it reserves air priority for the VoIP. So, in a double play business model, it is essential to get MOS voice quality of at least 4.1 and even 4.33 you must implement the WLP. I believe it can now be said without reservation, that if you are using unlicensed and wanting to implement a double play of VoIP + data, the ONLY product out there that can do it in scale and with toll quality is BreezeACCESS VL. 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