This announcement is big news for the mobile WiMax industry as it confirms Sprint’s continued support for Mobile WiMax within the US. This is also big news for the cable operators as from this point forward they will for the first time be able to offer a true triple play to compete with existing telephone operators. They originally tried a MVNO type platform with Sprint called Pivot, they announced several months ago to terminate the agreement due to billing platform and customer confusion issues. This JV should allow them to require a built in billing platform that would interface with their existing cable billing platforms. This would allow them to actually sell the service as a fully integrated triple play instead of simply offering the discount and limited extra services that Pivot was able to produce. This also marks a huge step for Google. They were recently out bid by Verizon Wireless in the latest FCC spectrum auction. This would give them the ability to enter the wireless market. They recently created a new smartphone platform called Android and have been reportedly been working on an answer to the iPhone nicknamed the gPhone. This would give them the flexibility to implement more of what they want without the carrier control that has existed for so long in the US’s wireless market. The spectrum that Verizon won actually came with some open access provisions that Google was pivotal in getting implemented. They want to be able to create devices and services for devices without the carriers limiting either functionality or availability. It is also interesting that Sprint had put forth estimates that it would cost $5 billion to build a complete nation wide wireless network.
Similarities and Differences between LTE, UMB & WiMax Presented By: Brandt Elster
Analogy for the differences between TDMA, FDMA, SDMA, CDMA
Take a large room with a decent number of people in it. There are multiple different conversations going on throughout the room.
TDMA – Everyone in the room would take turns speaking. Each group of people would be assigned a specific time slot.
FDMA – Each group in the room would speak at a different pitch (frequency) far enough apart that they can be differentiated.
SDMA – Each group’s speaker would talk in a specific direction, only people in front of them would be able to hear. If the room is big enough you could have multiple people speaking in the same direction as long as they were far enough apart.
CDMA – Each group would be assigned a specific language to communicate with. They would be able to easily discern their specific language and all others would be small and ignorable background noise.
Wifi is predominantly used in the 2.4 GHz range due to range limitations with the 5GHz frequency band
It divides these frequency bands into channels that are 22 MHz wide with 5 MHz spacing in between.
WiFi networks consist of two main components. The Access Points (APs) and the clients. The AP continuously broadcasts it’s SSID or name every 100 ms at 1 Mb/s. Sending at 1 Mb/s ensures that all users are at least capable of sending at that speed.
WiFi is not capable of collision detection. It instead does collision avoidance using RTS/CTS. It also uses acknowledgements to make sure that the packet is received.
Generally WiFi networks connect back to a 802.3 Ethernet connection, but they can connect 2 devices to one another (AdHoc Networks) or connect a computer directly to the internet.
06/09/10 Page of 58 Brandt Elster Protocol Release Date Freq Typical Thruput Max Data Rate Indoor Range Outdoor Range Legacy 802.11 1997 2.4 GHz .9 Mb/s 2 Mb/s 20 m 100 m 802.11a 1999 5 GHz 23 Mb/s 54 Mb/s 35 m 120 m 802.11b 1999 2.4 GHz 4.3 Mb/s 11 Mb/s 38 m 140 m 802.11g 2003 2.4 GHz 19 Mb/s 54 Mb/s 38 m 140 m 802.11n June 2009 2.4 GHz 5 GHZ 74 Mb/s 248 Mb/s 70 m 250 m 802.11y June 2009 3.7 GHz 23 Mb/s 54 Mb/s 50 m 5 km
Has already seen a small launch in the United States – Clearwire
Has seen similar deployments around the world.
Large companies have committed to it
SK Telecom (WiBro is a variant of WiMax and has been launched in South Korea)
There have been discussions to morph WiMax into the LTE Umbrella and make it a stepping stone to LTE
This may be a play simply to discredit WiMax and make it sound inferior
The newest revision of Mobile WiMax (802.16m) is expected from the IEEE sometime this year and should bring the theoretical speeds for a mobile application up to a level of those expected from LTE & UMB.
Provide enhanced data speeds for both handheld devices and laptop connect cards
Could replace the traditional wired networks as they are much cheaper than fiber to the curb, and speeds look to be the same if not higher than those offered via wired today
This would be for the following services
HSI to replace DSL/Cable Modems
Digital Phone for the Home
IPTV or TV over IP to replace standard cable or satellite provider
This would give previously only mobile operators the ability to sell the very lucrative triple play that, up until now, only existing LEC and cable operators have been able to.
06/09/10 Page of 58 Brandt Elster
Services and QoS Category Current Environment 4G Possibilities [Source: UMTS Forum, "Standardising the future of mobile communications with LTE (Long Term Evolution)." Towards Global Mobile Broadband (2008): ] 06/09/10 Page of 58 Brandt Elster
The mobility versions of WiMax have three basic handover methods defined. They are:
Fast Base-Station Switching (FBSS):
The mobile handset maintains a set of multiple suitable base stations
One base station is selected as the anchor and is where all the communications will take place.
The mobile handset will continuously choose which ever base station has the best connection from its list.
The mobile handset can change the anchor at any time without any handover signaling
Macro-Diversity Handover (MDHO):
Just like in FBSS the mobile handset keeps an anchor and a list of base stations
However this time the mobile handset communicates with all base stations
Physical Layer & MAC Protocols - WiMax 06/09/10 Page of 58 Brandt Elster
Comparison of the Technologies 06/09/10 Page of 58 Brandt Elster *UMB simply states the use of the technologies. There is no mention on specifics for DL or U **Includes latest release of 802.16M not currently available [Source: Scheim, Jacob. "A comparison of two fourth generation technologies: WiMax and 3GPP-LTE." Comsys . 2006.] Aspect LTE UMB WiMax Access Technology (DL) OFDMA OFMDA, SDMA, CDMA* OFDMA Access Technology (UL) OFDMA OFDMS, SDMA, CDMA* OFDMA Capable Speeds 100 Mb/s DL 50 Mb/s UL 280 Mb/s DL 75 Mb/s 75 Mb/s 25 Mb/s Channel BW 1.25 to 20 MHz 1.25 to 20 MHz 5, to 20 MHz Spectral Efficiency 5 bits/sec/Hz 4-6 bits/sec/Hz 3.25 bits/sec/Hz Time to market 2010 2009 2008 Legacy GSM/UMTS CDMA2000 WiFi