Alpha Omega Wireless Blog

Alpha Omega Wireless Deploys Licensed WiMax for Utilities

Posted by Joe Wargo on Wed, Aug 19, 2015 @ 10:30 AM

This article discusses a recent licensed WiMax case study that Siemens AG, Industrial Communications group and one of our utility clients released. It talks about some unique communications challenges our utility client had and how we were able to solve them using licensed microwave point to point wireless backhaul and licensed WiMax. Like most all utilities they have dozens of sites out in the field of their coverage area. Most of these sites have SCADA, cameras, access control, meters, etc. They needed real time connectivity and reporting.

Wireless Backhaul Licensed WiMax

The solution was to provide licensed wireless connectivity to multiple fixed locations, using a point to multipoint wireless Ethernet bridge system. This wireless backhaul network would allow for SCADA telemetry, remote network connectivity, and also allow some mobility for their workforce. AO Wireless choose to use Siemens RuggedComm Licensed WiMax for this solution. AO Wireless helped our client acquire spectrum in the 2.5GHz band from a carrier. Basically it only cost them $1500 a year to own their own licensed radio frequncy that provides interference free operations, greater wireless security, and better RF probabgation.

As part of the overall wireless backhaul network, AO Wireless, also built out over 575 miles of full duplex, licensed point to point microwave backhaul. The point to point licensed wireless backhaul was set up in a 2+0 configuration with multiple ring topologies to provide greater redundancy and greater wireless Ethernet capacity. This outdoor wireless network (wireless WAN) gives them a GigE throughput capacity for future needs.

Take a look at the case study if:

You are interested in licensed WiMax / LTE

Have multiple sites that need greater bandwidth

Interested in High Bandwidth point to point connectivity

Need 99.999% predictable reliability connectivity


Click for free Licnesed WiMax Case Study:

Licensed WiMax Case Study

Tags: Point to Point Wireless, Licensed wireless, Point to Multipoint, WiMax, wireless backhaul

Wireless Mobility for Private Networks

Posted by Joe Wargo on Fri, Jan 31, 2014 @ 02:38 PM

There is an ever-growing need to provide high speed IP bandwidth in mobile applications. One of the greatest challenges is how to deliver broadband connectivity to moving objects, whether it be passenger or commercial rail, vehicles, watercraft, or unmanned moving objects. Since there is no way to physically cable a moving object, wireless connectivity is the solution.

           Mobility Connectivity    Wireless on rail

Wireless mobility can provide IP bandwidth that can be used for video surveillance backhaul, vehicle and sensor monitoring, remote vehicle control, on board Wi-Fi, computer connectivity, Smart devices like phones and tablets, voice communications, vehicle location tracking, transportation management, or public announcement systems.

Different wireless technologies can be used for mobility applications, such as: wireless mesh radios, point to multipoint wireless backhaul, WiMax, LTE, and radios designed for mobility handoff. There are a lot of wireless manufactures that claim to have broadband radio systems that can provide wireless mobility. Using the right radio equipment is important for the needs of the application. Some applications need extremely low latency while others are more concerned with the amount of bandwidth provided.

The main question is what is the mobility application? Many industries, like utilities (water, oil & gas, and electrical), government (city and county), first responder (law enforcement and fire), etc. all have needs for mobility applications beyond two-way radio and cellular connectivity. Is there a need for IP network connectivity back to the organizations data network and need for Internet connectivity? The problem with using cellular LTE is the reoccurring costs and having to manage so many plans. There is also no control over how employees are using the consumed data amounts on the plans. Security is also a huge issue when using public networks versus being able to control a private network that has no other access outside the organization.

In may cases organizations want to have both fixed and mobile applications, like a utility or city that needs to have bandwidth at fixed locations around a geographic area but also want the ability to have bandwidth in their vehicles. There is a huge cost savings by having the ability for employees to be able to be connected to the home office while traveling around a service area rather than having to drive back and forth to get information. This can be getting email in the field, being able to pull work orders, upload video or pictures, get access to site plans, and so on.

Applications that have needs for both fixed and mobility can benefit from using technologies like private LTE or licensed WiMax technologies. These technologies allow for 360-degree coverage capability with a reach upwards of 20 miles around a geographic area. Bandwidth can reach up to 40+Mbps.

There are some great radio systems now that can connect to a private LTE/WiMax network and can also if need be roam onto existing cellular networks as they roam outside a good coverage area. These systems can also provide in-vehicle Wi-Fi providing connectivity to laptops, tablets, and smart phones.

In other cases like transportation such as rail, both passenger and cargo, the use of mobility handoff systems that are fixed can provide a better solution. In this case the coverage area is more linear. Using directional radios allow for better performance and more control of the use of spectrum efficiency. It’s possible to get over 100Mbps with zero packet loss and less than 2ms of latency

The unique technical challenge is providing seamless hand off as a moving object passes wireless backhaul node locations. There needs to be seamless handoff at low latency so that data connectivity isn’t interrupted. This is just like the use of cellular networks that provide connectivity with out drops as you are traveling down the road in a car and talking on the phone. The key elements in a successful wireless mobility solution are proper wireless network design, accurate wireless path engineering, wireless spectrum analysis to determine appropriate frequency utilization, hardware choice and configuration, and most importantly is the quality of wireless installation.



Tags: Point to Multipoint, WiMax, LTE, mobility

Point to Point Wireless Bridge Compared to Fiber

Posted by Joe Wargo on Wed, Feb 20, 2013 @ 04:51 PM

As a country we have relied on fiber communications as our primary means of wide area network connectivity. Fiber though is extremely expensive to provision due to right away access, permitting, construction, labor, and cost of material.  Meanwhile a lot of other countries have leap frogged the USA by deploying fixed wireless microwave communications. Many countries around the world are deploying wireless bridge microwave backhaul as their primary backbone telecommunications network. The costs of deploying a point to point wireless bridge can have a ROI of less than three months compared to even leasing fiber that is pre-existing.

Wireless backhaul can be deployed in a matter of weeks if not days. Wireless bridges such as unlicensed 5.8GHz point to point wireless and point to multipoint wireless, in 5.8GHz and 3.65GHz WiMax can be purchased off the shelf and installed in a few days. Licensed microwave communications in the form of a point to point wireless bridge, also called fixed wireless bridges, can be obtained and installed in a few weeks. (see more information "Understanding Fixed Wireless Backhaul Configurations")

wireless bridge

With advancements in technology and newer regulation from the FCC, wireless Ethernet bridge systems can deliver over GigE (more than 1Gbps full duplex) throughput. Equivalent to that of fiber. A fixed wireless microwave link can go upwards of 50 miles. If proper wireless system design is done, a fixed wireless Ethernet bridge can provide a predictable reliability of 99.999% uptime. That's less than 5 minutes of predictable outage a year.

Most people don't think about the fiber once it leaves their building or know the path it takes. Fiber in urban areas runs inside sewer lines, underground conduits, and aerial on phone and light poles. In rural areas fiber mostly runs aerial along telephone and electric poles. Ever drive down a road and see a bunch of wood telephone poles leaning from side to side? Well that might just be the fiber your network is running on.

Fiber Cut

Ever question how long it takes for a telecommunications company to do a truck roll to repair a cut fiber? If it's a clean break fiber can sometimes be fusion spliced back together. In most cases where a fiber pole goes down or gets ripped out by a backhoe, the fiber gets stretch and has to be replace but cutting it at two ends and a new piece fusion spliced back in. This can take hours if not days to accomplish. What would be the cost to your business if that occurred?

Microwave communication can be in the form of a point to point wireless backhaul, a point to multipoint wireless bridge, or a mesh wireless Ethernet bridge. If a microwave radio fails it can be swapped out in the matter of minutes (provided a spare is maintained). After an earthquake or other natural disaster, a wireless system can be realigned immediately getting communications back up and running.  The biggest concern with wireless backhaul is the potential for wireless interference. Using a licensed microwave link can solve any interference concerns.(See more information "Wireless Backhaul Can Prevent Network Outages")

In order to get broadband across the USA at any reasonable time frame and at realistic costs we must turn to wireless backhaul technology. Fixed wireless, using both point to point wireless bridges and point to multipoint wireless (LTE and WiMax) can help expand our wide area network reach with carrier grade performance and reliability.

Tags: Alpha Omega Wireless, Point to Point Wireless, Licensed wireless, Wireless Industry, AO Wireless, Point to Multipoint, WiMax

LTE Wireless Communications

Posted by Joe Wargo on Mon, Feb 18, 2013 @ 12:18 PM

LTE (Long Term Evolution) is a wireless communication standard originally developed to provide high-speed data for mobile phones and data terminals. LTE expands on 4G wireless high-speed point to multipoint wireless communications. LTE offers mobile telecommunication providers the ability to increase broadband wireless backhaul and allow for future expansion. The LTE specification provides downlink peak rates of 300 Mbit/s, uplink peak rates of 75 Mbit/s 

LTE Wireless Backhaul
LTE as a technology is primarily for the mobile providers and operates in licensed 700/800 MHz and 1700/1900 MHz in the United States. Other frequencies can be used internationally. LTE is typically not a wireless communication solution for enterprise and commercial end users. Other technologies, such as WiMax, point to point wireless, and point to multipoint wireless Ethernet bridges are readily available to non-mobile operates for their wireless communication needs. Although, there has been an increased opportunity for LTE for other non-mobile applications such as, Smart Grid and SCADA applications for water, gas, and electrical utilities. In this case LTE is used for both mobility and fixed wireless applications.

Utilities have the opportunity to acquire licensed wireless frequencies from the FCC and third party owners of spectrum (typically in the 700MHz bands). LTE can provide coverage areas in a macro cell of greater than 20+ miles. Ideal wireless communication coverage areas can be up to 11 miles with good coverage. LTE sites are typically on communication towers that are spaced out geographically.  These sites can be connected either via fiber or by using point to point wireless bridges, like licensed microwave backhaul. To avoid wireless interference it is recommended that point to point wireless backhaul be done with licensed wireless bridges and not unlicensed wireless point to point bridges. Wireless point to point links can provide up to GigE full duplex capacity. 

Because of the ability to use lower frequency bands LTE offers great coverage areas. It also protects an organzations investment by allowing for future upgrades and changes. WiMax also offeres similar coverage capability and wireless backhaul bandwidth. Both technologies offer great solutions for wireless backhaul for both mobile and fixed wireless communication applications. Even though it is truly a wireless communication standard derived for use by mobile phone porivders, other applications needing wireless broadband connectivity can benifit for the emerging tehnology. 

Tags: Alpha Omega Wireless, Wireless Industry, WiMax, LTE

Crossing the Great Microwave Communication Divide

Posted by Joe Wargo on Sat, May 29, 2010 @ 03:25 PM

There is no doubt that there is a demand for greater IP bandwidth by both the consumer and commercial enterprise. The work place across all vertical markets has become more dependent on electronic communication. The work place relies on e-mail, VoIP phones, file storage and sharing, application delivery, collaboration, reporting, IP Video, Access Control, etc. Everywhere we turn we see the consumer using the internet for entertainment, personal interaction, managing their finances, content delivery, etc.

So how are we going to deliver all the necessary bandwidth and provide internet connectivity to all areas of the country? Ask a government official or the lobbyist of the large telecommunication providers and they'll say run fiber everywhere. Sounds great but when reality hits the notion of fiber everywhere is as mythical as a unicorn. Technically can it be done? Yes if you can wait several decades and have trillions of dollars to spend and don't mind replacing it all because by the time it's all deployed it's obsolete or needs to be replaced due to deterioration.

Licensed Microwave Backhaul RepeaterAs the USA spends millions lobbying for a fiber build out and billions more slowly deploying a fiber backhaul infrastructure the rest of the world is leap frogging us by skipping over a fiber infrastructure by rapidly deploying wireless backhaul using microwave communications and technologies like WiMax backhaul and LTE. They are getting bandwidth in even the most remote places in the matter of months and have done so at a fraction of the cost. They also benefit from having scalable infrastructure protecting the overall CAPEX and future growth.

Here is an example: Out in a rural area if you needed to run fiber 5 miles it could take over a year and a million dollars to do so. You would need to first gain right away access to run the fiber cabling, get permits from potential multiple entities, set up long term land use agreements, install poles every 100ft in order to string the fiber along (which is cheaper than trying to trench the ground five miles to lay conduit), run the fiber and fusion splice it along the way, install expensive head end equipment on both ends, and then figure out how to spread it out from there. I guess you run even more fiber? Name a carrier that is willing to spend millions to get fiber out to a small community where it would take decades for them to get an ROI.

Wireless backhaul using microwave communications in the same scenario can be deployed in days and cost less than $100K. With a point to point wireless backhaul you do not have the need to get right away access, need permits beyond the two end points, have any need for costly infrastructure along the path, or have expensive head end equipment. From the end point you can easily spur off wireless connectivity to other locations using point to multipoint wireless Ethernet bridges, point to point wireless backhaul, WiMax backhaul, or wireless mesh. This can be done in days not years and at a fraction of the cost of fiber.

The argument comes up that fiber delivers greater bandwidth. Not true. Wireless backhaul can use licensed microwave links delivering better than gigabit wireless communication and if more bandwidth is needed it's quick and simple to add more microwave links.

What about reliability? Let me ask you. What happens when a wood pole holding aerial fiber get hit by a car or knocked down in a storm. Don't laugh it happens more than you think. Even fiber in underground conduits gets destroyed. See my article "Outdoor Wireless Bridges or Fiber, Which Do You Trust." If it's a clean break fiber can be fusion spliced back together. In most cases where a fiber pole goes down or gets ripped out by a backhoe, the fiber gets stretch and has to be replace but cutting it at two ends and a new piece fusion spliced back in. This can take hours if not days to accomplish. If a microwave radio fails it can be swapped out in the matter of hours.

A fixed wireless microwave link can go distances up to 50+ miles and provide data rates of 10Mbps full duplex to GigE Full Duplex (gigabit wireless). With proper wireless system design, a fixed wireless Ethernet bridge can provide 99.999% reliability. Wireless Ethernet bridges can be installed at a lowered throughput and later software upgraded to higher bandwidth when needed allowing for a lower wireless installation and protecting the CAPEX for future growth.

In order to get broadband across America at any reasonable time frame and at realistic costs we must turn to wireless broadband technology. The biggest hold up is the FCC opening up more spectrum for wireless backhaul.

Tags: Point to Point Wireless, Licensed wireless, General, Wireless Industry, Point to Multipoint, WiMax, wireless mesh

Outdoor Wi-Fi or WiMax? London Chooses Wi-Fi for the Summer Olympics

Posted by Joe Wargo on Sat, May 22, 2010 @ 04:56 PM

Is there still value in deploying a city wide outdoor wireless Wi-Fi network? Every day there the number of people that use mobile devices that are Wi-Fi enabled continues to grow. The demand for high speed connectivity to the internet is in high demand. So there is definitely a business case for it.

Outdoor Wi-FiMany cities have tried a wireless installation to provide complete city wide Wi-Fi connectivity and have failed. In many cases the city governments, that have no staff trained and experienced in outdoor wireless backhaul and outdoor Wi-Fi systems, that tried to deploy the outdoor Wi-Fi technology rather than an outdoor wireless backhaul or mobile carrier provider, that does have experience and knowledge in mass deployments of RF and microwave communications.

Three major reasons why many of the outdoor Wi-Fi attempts failed are because there was no clear business model, projects were attempted without using highly skilled outdoor wireless installation and wireless engineering integrators, and a complete lack of understanding in the costs associated with deploying and maintaining an outdoor Wi-Fi system. Technically, it is very difficult to deploy the amount of wireless access points needed to provide complete RF coverage without causing self wireless interference. It can be done but so often wireless engineering was an afterthought when it should have been the first step.

On the other hand, WiMax backhaul promises high speed wireless connectivity to mobile devices and has already been deployed around the world with great success. WiMax backhaul, as a standard, was originally designed for outdoor wireless connectivity where Wi-Fi is a standard for indoor wireless connectivity. WiMax can cover much farther distances, requires much less infrastructure, is cheaper to deploy, wireless installation is easier, and is more cost effective to maintain. The problem is that there are not a lot of devices that are equipped with WiMax chipsets yet.

Over the years, there have been a lot of quality wireless manufactures that have come to market with outdoor wireless communication products for either outdoor Wi-Fi or WiMax solutions. Companies like Xirrus (who probably has the strongest outdoor Wi-Fi solution) and BelAir Networks have great solutions for outdoor Wi-Fi deployments. There are many others like Proxim, Motorola, and Aruba to name a few that have outdoor Wi-Fi solutions too. Companies like Alvarion, Motorola, Proxim, and Solectek to name a few make WiMax backhaul base stations and subscribers.

For the 2012 Olympics, London has declared that they will have a city wide outdoor Wi-Fi network. The services will not be offered for free but will allow tourists to stay connected to the world during the games. It is unclear who will be responsible for deploying the Wi-Fi network and who will maintain it after the Olympics. Will the City of London sell the network to an internet provider or mobile carrier or will they become a large WISP themselves. The hopes is that they will have a solid business model and will have the network designed and the wireless installation done by a credible wireless integrator. The one thing for sure is that both WiMax backhaul and outdoor Wi-Fi technology will provide a lot of benefit to the users of mobile wireless connectivity.

Tags: General, Wireless Industry, WiMax, Wi-Fi

WiMax Backhaul – What it is and what it’s not, Part 2

Posted by Joe Wargo on Mon, May 03, 2010 @ 02:04 PM

From Part 1, we described how WiMax backhaul is a point to multipoint wireless backhaul technology used to create high bandwidth wireless Ethernet bridges between a Base Station Unit (or an array of BSU's) to a Subscriber Unit (or CPE device). WiMax backhaul in the USA, according to the regulations of the FCC, is 50MHz wide of the 3.65GHz frequency band and is a non-exclusive use of microwave wireless, although a service provider must register the wireless bridge broadcast. In other countries the unlicensed wireless 3.5GHz band is common. Licensed microwave 2.5GHz is used by some carriers.

Service providers have adopted WiMax backhaul as a technology that they could readily deploy cost effectively to provide the last mile fixed wireless connectivity with greater bandwidth. It wasn't until later that WiMax backhaul evolved to the mobile carrier space. WiMax currently is a competing 4G technology to LTE (note: see article "WiMax Outdoor Wireless Bridges versus LTE Wireless Networks" for more detial). There are a lot of articles on whether WiMax and LTE truly compete or will end up being complimentary technologies providing different service benefits. The one issue with WiMax is because of the higher frequency bands it does not do well with penetrating obstructions like passing through walls of a building providing coverage indoors. The use of OFDM and MIMO do allow for (NLOS) non-line-of-sight wireless connectivity outdoors.

WiMax backhaul does not compete with the Wi-Fi standards, nor does it replace it. There will continue to be the need for Wi-Fi indoors and around campus environments to provide network connectivity to the LAN. WiMax backhaul will allow mobile device to get high speed internet from the carrier service provider companies that the devices are associated with (such as AT&T, Verizon, T-Mobile, Sprint, etc.).

The bottom line is WiMax backhaul is truly for service providers and mobile carriers. WiMax is not a solution for an end-user. The technologies used by WiMax have already been used for years now (e.g. OFDM and MIMO). WiMax is not a licensed microwave wireless solution that will completely avoid wireless interference. Nor will WiMax backhaul replace point to point wireless backhaul, licensed microwave links or unlicensed wireless Ethernet bridges. Because of the small channel width available currently, WiMax doesn't bring any higher bandwidth for an end user application. The WiMax 2 initiative takes more advantage of the use of MIMO and will provide more bandwidth, like wireless Ethernet bridges that use 802.11n chipsets today.

Today there are many systems that can produce higher wireless backhaul bandwidth by using standard unlicensed wireless Ethernet bridges compared to using WiMax as a wireless backhaul solution. Many manufactures have cashed in on the WiMax standard and have over sold its capabilities and what it's for to the end user market place.

If you are not a mobile carrier or a service provider (WISP), WiMax backhaul does not provide you any advantages over other outdoor wireless Ethernet bridge systems that have been deployed for many years now. To register WiMax is pretty difficult in many areas because many WISP and mobile carriers already have taken the spectrum. Note: see image below showing the areas already registered by service providers and mobile carriers in the Sacramento and San Francisco, CA area.

WiMax Backhaul Coverage

If you need a point to multipoint wireless backhaul solution there has been for years wireless equipment that have the same benefits of WiMax, such as OFDM and use MIMO, that can actually provide much greater bandwidth ( now up to 300Mbps).

Is WiMax good for you? As a mobile user it will provide us great wireless backhaul throughput to our mobile devices. For end users that need another internet provider solution, especially in areas where they can't get DSL, WiMax will allow service providers to provide a high quality wireless Ethernet bridge to areas that were either technically difficult or too costly to provide connectivity to. But for Government, Enterprise, or Private networks it does nothing!

Tags: Point to Point Wireless, Licensed wireless, General, Un-lincesed Wireless, Wireless Industry, Point to Multipoint, WiMax, Wireless 101

WiMax Backhaul – What it is and what it’s not, Part 1

Posted by Joe Wargo on Mon, May 03, 2010 @ 02:02 PM

Many customers come to us and say that they need a wireless backhaul solution, but say they are waiting for WiMax. We ask, "Why?"

Many people that are not part of (or don't closely follow) the wireless backhaul, point to point wireless bridges or point to multipoint wireless backhaul, industry or the 4G mobile (LTE and WiMax) carrier industry really don't understand what WiMax is all about. Some think it's a Wi-Fi replacement. Others think it's a new technology that is going to replace all outdoor wireless backhaul, like licensed microwave links or wireless mesh networks. There is a lot of talk about the standards-based technology of WiMax backhaul. Many people do not know what WiMax is or what WiMax is not.

The term WiMax has become a marketing machine and has pushed the outdoor wireless backhaul industry into one the fastest growing technology industries. Just as the term Wi-Fi has been trademarked to the indoor wireless LAN market, WiMax is a trademarked term for a standards-based point to multipoint technology for the outdoor wireless backhaul market. WiMax in itself is not encompassing of all outdoor wireless backhaul. Note: image below is reported by the WiMax Forum as of Feb, 2010.

WiMax Deployments Worldwide

A General Background:
WiMax backhaul was originally designed to be a point to multipoint wireless backhaul solution for providing last mile wireless Ethernet bridges, as alternative to DSL to the home and T1 replacement to businesses. A point to multipoint wireless system consists of a base station unit ("BSU") or sometimes called an Access Point ("AP"), as a standalone or part of a cluster to provide multiple sectors of wireless backhaul coverage that provides wireless backhaul to multiple Subscriber Units ("SU"). SU's are sometimes called CPE's (customer premise equipment). This was for the WISP and telecommunication provider markets.

Part of the equation was also to make mobile devices (like laptops and mobile phones) equipped with WiMax 802.16 chipsets so they could become an actual subscriber unit, creating direct internet access through the service provider (like a giant outdoor hot spot). This would basically provide a direct wireless Ethernet bridge connection directly to a WiMax point to multipoint wireless base station array. Like a mobile phone connecting to a cellular tower.

Manufactures of outdoor wireless bridges and the WISP market realized that wireless interference is a huge issue with outdoor Ethernet wireless bridges. When you start using unlicensed wireless bridges to be a point to point wireless backhaul to unlicensed point to multipoint wireless bridges, which then provide backhaul for Wi-Fi access, in unlicensed 2.4GHz (802.11b/g/n) and 5.8GHz (802.11a/n), there is a large risk of wireless interference. At the same time many people have tried to extend Wi-Fi to outdoor environments to provide greater wireless connectivity to mobile devices, but this still needs a backhaul at some point.

WiMax backhaul was originally going to be in a frequency band away from the popular 5GHz band (5.3GHz, 5.4GHz, and 5.8GHz) used for most unlicensed wireless bridges. Unfortunately, the FCC did not allow for this. Later the FCC did open up a small piece of spectrum, 50MHz wide, of the 3.65GHz band to be used by WiMax backhaul radios. The 3.65GHz band is non-exclusive, meaning it's not a licensed microwave bridge requirement, but just a lightly regulated space that requires service providers to register the microwave wireless broadcast. The 3.5GHz band is used for WiMax backhaul wireless radios in other countries. Some mobile carriers have manufactured their own radios to operate in their licensed 2.5GHz frequencies.

For a piece of wireless backhaul equipment to be considered WiMax Certified (by the WiMax ForumTM) it must comply with the 802.16 IEEE standards and be completely interoperable with other manufactures WiMax equipment. The problem is that there are not many devices that are truly interoperable or have been fully tested to work with one another. It's funny how many of the WiMax 802.16 standards, like OFDM, were already found in the existing product lines or outdoor wireless Ethernet bridge manufactures like Proxim, Alvarion, Motorola, and others. Most WiMax equipment is almost no different than current point to multipoint wireless systems operating in the 2.4GHz or 5.8GHz unlicensed wireless bridge frequency bands. Most use OFDM and MIMO technologies. WiMax backhaul just operates in a different 3.65GHz wireless band, which provides a smaller channel width and less data throughput.

More to come in Part 2...

Tags: Point to Point Wireless, General, Un-lincesed Wireless, Wireless Industry, Point to Multipoint, WiMax, Wireless 101

WiMax Outdoor Wireless Bridges versus LTE Wireless Networks

Posted by Joe Wargo on Sun, Apr 25, 2010 @ 04:44 PM

The one thing that most people don't understand is the industry background between WiMax backhaul and LTE wireless networks.

WiMax backhaul was originally developed by outdoor wireless backhaul manufactures as a way to provide fixed last mile outdoor wireless bridge connectivity. These were wireless Ethernet bridge players like Alvarion and Proxim (funny how many of the WiMax 802.16 standards, like OFDM, were already found in their existing product lines). Other players like Intel, who has a big stake in IP based technologies, joined the forum. The early intent, of those pushing the WiMax 802.16 standard, was to get the FCC to open up the 3.5GHz space for point to multipoint wireless backhaul. This was to serve the WISP (Wireless Internet Service Provider) market place. Part of the equation was to make mobile devices (like laptops and mobile phones) equipped with WiMax chipsets so they could become an actual subscriber unit (a CPE device) and connect directly to a WiMax point to multipoint wireless base station array.

The one major issue many manufactures of point to multipoint wireless bridges were facing was that they were also providing point to point wireless backhaul in the unlicensed wireless backhaul space and providing outdoor Wi-Fi solutions. Wireless interference is becoming a huge issue in the outdoor Ethernet wireless bridge space when you start using unlicensed wireless bridges (like 5.8GHz wireless backhaul) to serve unlicensed point to multipoint wireless bridges, which then provide Wi-Fi access in unlicensed 2.4GHz (802.11b/g/n) and 5.8GHz (802.11a/n). WiMax equipment if offered in a separate frequency band like 3.5GHz would open up a lot of outdoor wireless backhaul spectrum.

It wasn't until later that WiMax backhaul evolved to the mobile carrier space. Carriers, both fixed wireless and mobile, have adopted WiMax as a technology that they could readily deploy cost effectively to provide the last mile connectivity with greater bandwidth. The other advantage of WiMax backhaul is that IT people (that understand IP networking) can easily take part in outdoor wireless backhaul network deployments because they understand the IP networking background required for WiMax backhaul networks.

LTE was the evolution of the carrier's TDM transport to gain broadband to mobile devices. Many carriers like LTE because it's just an evolved technology of what they are already using. LTE is a natural progression from 2G / 3G and allows fall back. When a mobile device roams out of quality signal strength of an LTE (4G) network it can easily fall back to 3G or lower speed connectivity. Another advantage of LTE over WiMax is that LTE offers less wireless backhaul latency. WiMax backhaul uses a bigger overhead in packets. Many of its supporters are the manufactures that have been part of the mobile market all along.

WiMax backhaul has gained great ground recently worldwide because the equipment is very inexpensive and can be readily deployed for both fixed wireless backhaul and mobile broadband applications. WiMax backhaul equipment can literally be purchased any day of the week form a wireless installation company or wireless distributor. Most outdoor wireless installation companies have equipment on the shelf. Although LTE is a natural progression for carriers that have an existing 2G / 3G networks, countries that do not have a built out cellular network, WiMax backhaul is an easy choice to jump to.

One big difference is that LTE is solely a licensed microwave technology that carriers are utilizing their existing licensed spectrum, where WiMax backhaul is mostly unlicensed (at least in the USA with the exception of a small slice of spectrum in the 3.65GHz space). Many carriers are having the WiMax backhaul manufactures produce outdoor wireless point to multipoint radio equipment that will work in their licensed bands.

Tags: General, Wireless Industry, Point to Multipoint, WiMax