This scheduling in the WiMAX MAC allows us to have 50-100 clients on a single WiMAX AP with no fall off in bandwidth per client (up to the capacity limit of course). With wifi, we could only get 10-15 or so clients on an AP before bandwidht falls of a cliff. The only downside is really latency. With a few clients on WiFi latency is around 5-10ms but with WiMAX it is always about 50ms given the scheduling, even with just one client connecte. At larger number of clients, latency stays the same, until you approach >50 clients then it begins to creep up.
tler ----- Original Message ----- From: "Joe Christensen" <[EMAIL PROTECTED]> To: "ptp-general" <[email protected]> Sent: Thursday, September 18, 2008 11:39 AM Subject: [ptp-general] Re: Weekly Meeting, this Wednesday at Green Dragon Hello all, Great meeting last night. One of the items unresolved was our discussion of WIMAX and how it controls access to the network. I looked it up on wikipeda and confirmed that WIMAX uses a time-slot for each client, thus preventing one node from hogging the signal or data collisions between clients. This is a big enhancement from wifi. >From wikipedia: (http://en.wikipedia.org/wiki/WiMAX) "In Wi-Fi the media access controller (MAC) uses contention access — all subscriber stations that wish to pass data through a wireless access point (AP) are competing for the AP's attention on a random interrupt basis. This can cause subscriber stations distant from the AP to be repeatedly interrupted by closer stations, greatly reducing their throughput. This makes services such as Voice over IP (VoIP) or IPTV, which depend on an essentially-constant Quality of Service (QoS) depending on data rate and interruptibility, difficult to maintain for more than a few simultaneous users. In contrast, the 802.16 MAC uses a scheduling algorithm for which the subscriber station needs to compete only once (for initial entry into the network). After that it is allocated an access slot by the base station. The time slot can enlarge and contract, but remains assigned to the subscriber station, which means that other subscribers cannot use it. In addition to being stable under overload and over- subscription (unlike 802.11), the 802.16 scheduling algorithm can also be more bandwidth efficient. The scheduling algorithm also allows the base station to control QoS parameters by balancing the time-slot assignments among the application needs of the subscriber stations." Cheers, Joe On Sep 15, 2:39 pm, "Michael Weinberg" <[EMAIL PROTECTED]> wrote: > Hello all, > > The next PTP meeting will be this Wednesday at 6:30pm at the Green > Dragon on SE 9th and Yamhill. Let's gather outside in the nice patio > area. > > You can post meeting items here, or just show up and share what's on your > mind: > > http://www.personaltelco.net/WeeklyMeeting20080917 > > -- > Michael Weinberg > President > Personal Telco Project, Inc. > A 501(c)(3) Non-Profit --~--~---------~--~----~------------~-------~--~----~ The Personal Telco Project - http://www.personaltelco.net/ Donate to PTP: http://www.personaltelco.net/donate Archives: http://news.gmane.org/gmane.network.wireless.portland.general/ Etiquette: http://www.personaltelco.net/index.cgi/MailingListEtiquette List information: http://lists.personaltelco.net To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] -~----------~----~----~----~------~----~------~--~---
