Xmax Seminar

7/27/2019 Xmax Seminar

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ABSTRACT

Wireless operators today are facing a dilemma. Customers are

demanding more and more data applications to be delivered on the go.

However, the operator is using scarce expensive licensed spectrum that isoverburdened with delivering core voice services. Support for voice, data,

location awareness, chat and other applications are required for customers that

are very mobile. The operator is facing a choice of acquiring more licensed

spectrum (if any is available) or losing customers due to demand for advanced

services. xG Technology has a solution to this dilemma of overwhelming

demand for advanced applications versus lack of spectrum.

xG Technology is developing an affordable mobile voice and data

cellular system that operates in free unlicensed bands using what is known as

cognitive radio technology. Using cognitive (i.e., smart) radios and advancedsystem and signal processing capabilities, the xG system makes unlicensed

spectrum communications as reliable as licensed band communications. This

is made possible by effectively mitigating the interference in the congested

and chaotic unlicensed bands. Another advantage of xGs cognitive radio

approach is the reduction of the RF engineering the operator needs to deploy

and maintain the system. A third benefit of this system is the ability to reuse

all the engineering going into smartphones, tablets and laptops today. The xG

system is designed to support these devices through a physical or WiFi

connection. Finally, the xG system is all-IP protocol based so that it can utilizeCOTS (commercial off-the-shelf) infrastructure components for network

connectivity, standard applications and established management interfaces.


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INTRODUCTION

xMax, as a physical layer technology, can be configured for use in

wired and wireless products; designed for deployment at any frequency;

configured for licensed and unlicensed spectrum, or in a spectrum sharingfashion. Importantly, it can improve range and battery life in such applications

and uses the radio spectrum in a very power efficient manner. The original

xMax system is a hybrid technology in the sense that it has aspects of both

narrowband and wideband communication systems; it uses pulse position

modulation (PPM) and ultra wideband communications (UWB), but also

employs a narrowband carrier. The use of the carrier at the receiver basically

eliminates the difficult synchronization and search problems inherent with

PPM and UWB systems.

Low-cost mobile voice and broadband data services, xG Technology,Inc. has developed an innovative wireless communication system (aka

xMax) that is capable of delivering mobile voice over IP (VoIP) and

broadband data services in the 902-928 MHz unlicensed band. From a

business model perspective xG Technology is targeting this scalable radio

access network (RAN) solution towards new-entrant service provider partners,

such as cable companies, competitive local exchange carriers (CLECs),

satellite companies, foreign incumbent local exchange carriers, etc. that may

be seeking to deliver mobile VoIP/data services to the market on a nationwide

or selected market basis.

The inclusion of voice capability in addition to broadband data in the

xMax RAN solution is a critical differentiation that will be emphasized

throughout this white paper. This is because despite the media fascination with

the iPhone and other smartphones and despite the increasing demand for

mobile broadband data services, mobile voice remains and will continue to

remain the major revenue earner for mobile operators. Note the following

market facts:

The GSM Association estimates that of the 4B mobile usersworldwide, roughly 90% are voice only users

Thus we see that despite the hype, mobile broadband data revenues are

less than 20% of that of mobile voice. Even using bullish industry assumptions

for mobile broadband data growth, it is likely to take 9-10 years before mobile

broadband data revenues are on parity with mobile voice revenues.


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OVERVIEW OF xMAX

xMax is a mobile voice and data solution from xG Technology that has

been designed to address the issues raised above and more. In particular, it

was designed with the following requirements in mind:

1. Leverages COTS end user devices including 3G and 4G smartphones, tablets and net books without requiring licensed

commercial frequencies.

2. Dynamic Spectrum Access (DSA) and advanced interferencemitigation to increase operational and deployment flexibility.

3. Full cognitive networking capabilities including dynamicaccess and optimization of available spectrum resources, as

well as self-Radio Frequency (RF) planning and self-

organizing.

4. A single end-to-end IP network architecture supporting mobilevoice, wideband data, real time video, chat and other apps.

xMax WORKING

Take the energy issue first. xMax uses a modulation technique

designed to allow more data to be transmitted on a single sine waves than is

required with typical modulation technologies. So instead of using more than

100,000 sine waves to transmit one bit of data, xMax uses a ratio closer to 1:1.

This technique would therefore be more efficient and keep energy levels very

low, which would mean devices that receive the signals wouldn't consume

much power. To solve the distance problem, xMax uses frequency channels in

the sub-gigahertz range, which can penetrate obstacles such as walls or trees.

But channels below 1GHz are very narrow, which means it is difficult to pack

large amounts of data into them. xMax fulfills the need for a radio technologythat According to the inventor Joseph Bobier "xMax's unique signal profile is

a perfect fit for low frequency channels that have previously been unsuitable

for wireless broadband." The technology will benefit rural ISPs due to the

lower number of base stations required. xMax, because it has 20 times the

range of Bluetooth, could challenge that technology. Other possibilities are

enterprise WLANs and metropolitan networks. Nowadays it is used for VoIP

(Voice over Internet Protocol)


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Network Structure

In order to meet the objective of providing low-cost mobile voice and

broadband data services the xMax carrier class cognitive radio solution has

been developed around commonly used and open Internet protocols includingIP, RTP, UDP and IP. In addition, it was designed to operate in both

unlicensed spectrum, such as the 902-928 MHz ISM band, and licensed

spectrum.

As a result of these design considerations, xMax includes responsive

opportunistic-use technology based on Identify And Utilize (IAU) techniques

capable of combating in-band interference encountered in the unlicensed

spectrum, and extends the SIP and RTP protocols to the wireless domain.

Among VoIP signaling protocols, SIP is regarded as very bandwidth-

inefficient from a signaling overhead standpoint. In fact, SIP signaling can

consume up to 400% of the VoIP payload bandwidth, an unacceptable figure

for mobile networks.

To increase the efficiency of SIP signaling, yet maintain 100%

standards compatibility with external VoIP systems and soft switches, xG hascreated patent pending SIP compression technology for the xMax system that

reduces SIP overhead bandwidth from 400% to 66% on the over the air links

and backhaul links from the Base Stations to the xMax MSCs. The MSCs do

the SIP compression and decompression to maintain 100% interoperability

with third-party VoIP systems. This also has the benefit of making more

bandwidth available for mobile data applications being carried alongside voice

traffic.


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NETWORK ARCHITECTURE:

The primary consideration in the network architecture design of thexMax system is to achieve the goal of providing robust, scalable, and full-

featured voice and data services to mobile subscribers at a fraction of the cost

of traditional approaches. A reference model form of the resulting Internet

Protocol (IP) centric network architecture is shown in Figure 2.

Figure 2: xMax Network Architecture Reference Model

As the diagram indicates, the network architecture includes the following

elements:

Air-interface designed for operation in unlicensed as well as licensedbands.

Base station (BSN), which provides radio to network access tohandsets. The xMax base station is a three sector, 18 channel mobile

VOIP transceiver device. The BSN channelizes the 902-928 MHzband into 18 discrete channels, which are only used

when there is traffic to mobile devices that are registered

with a particular channel.

Access Network Gateway (ANG), called the xMSC in an xMaxnetwork that provides call process, IP packet delivery services and

several other IP, mobility and network signaling related functions.

Technology agnostic back-haul links from BSN sites and the ANG(Fiber, Metro Ethernet, PTP Wireless, etc.).


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While the BSN is conventional in both architecture and functionality,

the ANG (xMSC) is a novel piece of wireless infrastructure equipment that

consists of 100% off-the-shelf hardware with proprietary software developed

by xG:

Ethernet Switch which aggregates BSN links. Firewall which provides private to public network address translation

(NAT) services.

SIP Proxy Server which supports SIP call control, xGs SIP messagecompression technology, and E911 services.

Proxy DHCP Server which is used for IP address services. Network Monitor (xMonitor) software which is responsible for end-to-

end network management and monitoring services.

Among the unique characteristics of the xMax network architecture is

the way mobility is implemented. The system provides soft handoffs with

make-before-break capability (timeslots are acquired before breaking a

connection), which result in reliable roaming and a seamless user experience.

This is demonstrated further in rhe ability of the system to perform inter-

technology handoff (xMax to WiFi). With all handoff decisions made at the

handset level via proactive channel scanning, there is no need for inter-base

station communication, which helps drive seamless operation.

The architecture further supports low-cost service deployment

objectives by leveraging commercial off the shelf (COTS) voice over IP

(VoIP) equipment, software and services, shown as VoIP core in Figure 3. The

VoIP core contains the following elements:

SIP Proxy Server which provides traditional SIP call control services. Media Gateway which provides media transcoding between IP and

PSTN networks and is responsible for subscriber accounting/billing,

PSTN call termination, Direct Inward Dialing (DID) phone number

maintenance, voicemail services, and inter-network call signal routing,among others.

The VoIP core can be owned and operated by the xMax operator, orcan be provided as a third party service.


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The xMax mobile cellular solution leverages a standard cellular

Figure 3xMax Mobile Cellular Network

architecture with some notable enhancements. The following (next pages)

are the major components of the system:

1. xMod:

The xMod is a small battery or vehicle-powered radio that bridges the COTSend user device to the wideband transport layer of the xMax system. Devices

may be physically tethered or connected via secure WiFi links to the xMod.

The xMod can deliver up to 3.5Mbps to the connected end user device(s)

under real world conditions


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FIG.4 : xMOD

2. xAP:

The xAP acts as a compact, high-performance base station and

wirelessly connects to the xMod using the xMax cognitive networking

waveform. Each xAP can deliver up to 14 Mbps of total user bandwidth to its

associated xMods. xAPs may be deployed individually or in clusters of up to 9

xAPs to increase total throughput.

FIG. 5 : xAP


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3. xMSC:

The xMSC acts as both a base station controller and aggregation point

for the connected xAPs. It performs routing and security functions, as well as

proprietary mobile VoIP optimization and compression. The xMSC is

typically connected to the worldwide Internet and one or more VoIP soft

switches.

The xMax Mobile Switching Center (xMax-MSC) is the backbone

network element in the xMax regional network. The xMax-MSC controls the

delivery of the voice and data services, and manages all elements in the

regional network (BSN and end-user devices). They include the following key

features:

Modular, redundant, pay-as-you-grow

Interworking between xMax specialized MobileVoIP and wireline VoIP

Optimized for mobile voice and data FCAPS for the xMax network and services 100% IP-based for low CAPEX and OPEX, and fast

learning curve

Single rack starter-configuration, delivered asintegrated solution by xG

FIG.6: xMSC

4. xMonitor/xDrive:

These software tools provide integrated and comprehensive network

and element management for the xMax network, as well as mobile network

throughput and coverage optimization. xMax networks include system

elements that provide advanced monitoring and management of network


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functions. These wireless system assessment tools include xMonitor and

xDrive.

xDrive

FIG.7: xDRIVE

xDrive is a drive mapping utility designed to gather, display, and log

performance statistics from the TX70 handset. It allows field technicians to

map the coverage of a deployment of xMax base stations, as well as providing

handset to base station link statistics.


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XMonitor

FIG.8:xMONITER

xMonitor is a component of the xMax xMSC that monitors the status and

health of all base stations, xMSC elements, and VoIP core elements. It

provides end-to-end IP network management and monitoring services.

MOBILE DEVICE

The xMax TX70 handset is a

versatile, full-featured handset that has

been designed to provide exceptional QoS

(quality of service) while supporting

calls,texting (SMS) and data over thexMax network, as well as over the public

internet using standard home, office, and

hotspot WiFi connections. The IP-based

TX70 is the first commercial mobile

handset with built-in, patented cognitive

radio technology.

The TX70 enhances the user

experience by offering sophisticated VoIP calling features not available on

legacy cellular systems. By incorporating an advanced system that detects and


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avoids interference, the TX70 delivers outstanding call quality that

surpasses most cellular phones.

The TX70 supports the proprietary, high-performance xMax air-

interface, which was designed for operation in both unlicensed and licensed

bands.

The following advanced capabilities are among the many features of the

TX70 handset:

Dual-mode xMax and Wi-Fi

Voice capacities exceeding 3G/4G protocols

Provides access to Wide Area mobile VoIP service

Domestic and international calling support

IP-network friendly

Advanced cognitive radio capabilities (detect and avoid, edge-device

driven handoffs, proactive alternate channel/path determination)

Bluetooth for hands-free operation

Adjustable output power for unlicensed or licensed use

xMax Capabilities and Supporting Features

Capability

1. Integrated IP-based cellular network for voice, data, chat andvideo

All voice, video, data (including geo-location info) is carried on a

single integrated xMaxnetwork. Unlike other 4G networks that require

separate networks for voice and data, xMax delivers a truly unified transport

layer. Its all-IP architecture leverages COTS routers and switches in place ofproprietary, expensive network


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Infrastructure used in other mobile networks. Common IP-based apps

(all smartphone and computer apps) are supported over the network, while

integration with legacy systems is greatly simplified.

2. Cognitive operation including DSA and interference mitigationxMax employs advanced cognitive radio and networking techniques,

including Dynamic Spectrum Access to provide reliable operation in

unlicensed but interference prone spectrum. xMaxs Dynamic Spectrum

Access technology is frequency agnostic and can be re-tuned to operate in TV

white spaces, unlicensed or licensed commercial bands. Another benefit of

xMaxs cognitive technology is that the network has the ability to self-

configure and self-organize. This is planned to be further enhanced to support

full meshing capabilities in future xMax product releases.

3. Extended range, reliability and throughput with low powerconsumption

xMax uses a state-of-the-art Physical Layer implementation that

maximizes range and reliability while minimizing power consumption. Thesystem continually self-adjusts to optimize the wireless communications link.

It was also designed so that end users andnetwork infrastructure are capable

of high mobility. The patented technologies incorporated to support these

capabilities also enable xMax to minimize power consumption and maximize

battery life while maintaining robust and secure connectivity.

4. Interference tolerance, frequency reuse and high link reliabilityBy applying cognitive capabilities to enhance active interference

mitigation (in addition to DSA), xMax can operate effectively under higher

interference and jamming levels than competing solutions. This is critical for

maximizing reliability as well as increasing the utilization of scarce spectrum

resources. By enabling xMax to tolerate high levels of interference before

requiring the radios to switch channels, more gray spectrum (spectrum

containing interference or jamming) can be used in place of white spectrum

(clean and interference-free spectrum). This capability increases the networks

total throughput and capacity greatly without consuming additional scarce

spectrum resources. Since the technique is primarily implemented within thereceiver chain, the RF environment is not made noisier as would be the case


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for mitigation techniques that rely on raising the transmitter power to

overcome the interferer. This technique significantly increases the system

capacity of an xMax network.

5. xMax supports COTS end user DevicesxMax uses a unique approach to integrate (COTS) devices into its all

IP network via the xMod wireless bridging device. By being device agnostic,

platforms, OS (operating system) and apps can be refreshed and sourced from

third party vendors quickly with no additional integration or software

development required. Training and complexity are also reduced since familiar

devices and interfaces can be seamlessly incorporated into the xMax network.

Due to the systems inherent scalability and affordability, xMax andconnected COTS devices can be widely deployed. The same smartphone can

be used in office or campus networks or in cellular mobile wide area networks.

6. Network scalability and flexibilityThe xMax system offers cost-effective scalability for capacity,

performance and uplink/downlink bandwidth shaping. By employing abuilding blocks approach to network configuration xMax network nodes can

be configured from 14 Mbps to 126 Mbps of capacity. The system also uses a

flexible TDD time slotted MAC layer. This MAC has configurable uplink and

downlink areas so that network uplink and downlink bandwidth ratios can be

set for specific applications such as web surfing, video conferencing and or

voice/text conversations.

The xMax system is designed with size, weight and power & cost

(SWAP-C) in mind. Network access points can be mounted on non-optimal

sites for easier network deployment due to their small size and weight.

Ethernet or fiber interfaces are provided to connect the infrastructure to the

operators backhaul network of choice.


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Supporting xMax Feature

1. End-to-end IP architecture and shared spectrum optimizationAll the components of the xMax system are IP based. COTS routers

and switches are used as network components. The xMax xAP supports both

Ethernet and Fiber interfaces. Voice is transported as mobile-optimized Voice

over IP (VoIP), enabling the entire system to operate as a data packet network

but with full voice calling features. Standard SIP signaling supports

integrated COTS voice switches and gateways, or an external (cloud-based)

switch/gateway service may be utilized.

The air interface between the xMod and xAP is an advanced Physical

Layer (PHY) featuring OFDM modulation and MIMO transmit and receive.This interface, combined with other xG innovations, was optimized to provide

licensed quality service in free, unlicensed spectrum. Since this is a shared

spectrum resource, implementing interference immunity and spectral

efficiency was paramount for commercial applications.

2. Advanced cognitive sensing, signal and multi-spatial processingReal time RF sensing and dynamic spectrum access are the

cornerstones of xMax radio technology. The commercial xMax system (slated

for release in H1 2012) utilizes the 902-928 MHz and the 5.725- 5.825 GHz

band for license free operation. Using these freely available bands allows the

xMax system to scan over 125 channels (inrelease 3) for interference-free

operation. Both the xAP and xMod devices are frequency agile and have

several built-in capabilities to mitigate interference by first employing

advanced signal/spatial processing as well as dynamically switching channels

to avoid overwhelming interference or jamming.

3. Advanced antenna, PHY layer and software radio designThe xMax PHY layer is designed with a proprietary 2x4 (two

transmitters, four receivers per link) multiple input multiple output (MIMO)

antenna and radio configuration. This MIMO system enables longer range,


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FIG.9: Dynamic channel selection

higher throughput and is a key enabler of the xMax interferencemitigation technology. Maximal Ratio Combining (MRC) and multi-spatial

receive diversity is utilized over the 4 receivers/antennas to provide over 5 dB

gain over non-MRC receivers.

The system uses orthogonal frequency division modulation (OFDM)

which is found in other state-of-the-art wireless systems such as LTE,

WiMAX, WiFi and other 4G+ solutions. The OFDM carrier spacing and

channel bandwidth are designed so that end user mobility is supported to over

65 mph. The xMax system utilizes proprietary long OFDM symbols, which

allow longer cyclic prefixes. This results in low overhead and high usablethroughput (as a percentage of total over the air bandwidth). The long prefix

design increases immunity to multipath interference found in harsh terrain and

urban canyons.

The xMax PHY supports adaptive modulation with BPSK, QPSK,

QAM16 and QAM64 modes that allow the system to dynamically self-

configure for the optimal combination of range, throughput and interference

rejection.

This combination of capabilities enables increased performance underdynamic conditions, in addition to minimizing power consumption for

extended battery life and remote operation.

4. MIMO, powerful DSP processing and advanced software designThe xMax system employs a new and powerful parallel processing

DSP/CPU unit that supports speeds up to 50 GOPS (billion operations per

second) for signal processing. This capable processor, combined with the 2x4

MIMO antenna configurations, enables the xMax system to use patent-


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pending spatial processing software to remove unwanted interference from the

target signal. Each xMax cognitive radio can simultaneously mitigate

interference from up to 24 mobile sources of interference or jamming.

Figure 10 - Spatial Processing to mitigate jamming and interferenc

5. xMod protocol bridgeThe xMod is a WiFi (or USB tether) to xMax protocol bridge. Using

an advanced signal processor, xMod provides the DSA and interference

mitigation capabilities of the xMax wideband transport layer at the network

edge.


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Figure 11- xMod protocol bridge

6. xAP clusters, transmit/receive synchronization and DSANetwork node capacity can be scaled from one xAP (14 Mbps) up to a

cluster of nine co-located xAPs (126 Mbps). All xMax xAPs are time

synchronized either by GPS or NTP. This enables co-location of multiple

xAPs and the ability to use all available channels without causing adjacent

channel interference, unlike non-synchronized systems. All radios transmit

and then receive in unison, which reduces or eliminates self-interference in the

network. This enables xMax to utilize 100% of available channel capacity

within the network. The xAPs scan and use the best channels out of the pool

of over 125 channels in release 3.0, with more spectrum bands can be added in

future releases. Each radio does this continuously and automatically tomaximize throughput.

Having 125 accessible channels allows neighboring network nodes

(made up of one or more xAPs) to utilize non-interfering channels

automatically. This allows the system to grow and scale easily without

redesigning the network RF plan each time a device moves or when xAPs or

users are added or removed from the network.

ADVANTAGES

Low costGiven that no spectrum licensing costs are involved, overall

costs are much lower in the case of systems operating in unlicensed

spectrum. Other costs, including the hardware and software requiredand deployment expense including engineering and legal fees, etc., are

either lower or commensurate. This means that prices to end-users can

be lower, and/or profit margins higher. As of this writing, over US$80

billion has been invested in auctioned spectrum just in the US alone,

and we estimate that over US$200 billion has been spent on spectrum

worldwide. These costs are of course passed on to consumers, and it is

clear that these funds could have been much better spent on additional

infrastructure, newer technologies, and even in some cases on lower

end-user prices, thereby expanding availability of these criticalservices.


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Rapid deploymentGiven that no spectrum licensing is required, type-approved

equipment can be deployed at will, no matter what the need or

application. Local siting and mounting regulations may apply, but the

overall process is far easier than with licensed technologies.

Installation flexibilitySimilarly, capabilities based on unlicensed technologies can be

deployed wherever required. Temporary installations are an especially

important opportunity, but permanent facilities are also possible with

the usual local permits and approvals relating to installation and safety.

New business opportunitiesAnd because unlicensed systems can be deployed at will, new

business opportunities can be rapidly addressed, again at minimal

expense. Theres no need to wait for carrier build-outs that could take

yearsnew and valuable services can be on the air quickly and easily

with faster time-to solution and time-to-market.

xMax against WiMax IEEE 802.16e

Technology AssumptionsTechnology

Assumptions

IEEE 802.16e xMax

Frequency Band 2.5 GHz 902-928

MHz

Spectrum Used (MHz) 20 20

BTS Coverage Radius

(Km)

0.953 2.3


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Frequency Reuse 1x3x3 1x3x3

Duplexing Scheme TDD TDD

Service Assumptions (Voice)Target Penetration (%

of Pops)

9 9

Allocation To Voice

Traffic (%)

7 7

Aggregate Voice

Throughput Per BTS

(Mbps)

1 1

EffectiveBandwidth Per

Voice Channel (Mbps) 0.03 0.030

Number of

Simultaneous VoIP

Users Per BTS

47 37

EquivalentErlangs @

2% Blocking Probability

37.5 28.3

Avg. Busy Hour Erlangs

Per Subscriber

0.03 0.03

Voice Subscribers Per

BTS

1249 942

% of Voice Subscriberson Unlimited Plan

50 50

Unlimited Voice Plan

Pricing ($/month)

40 40

% of Voice Subscribers

on Per Minute Plan

50 50

Cost Per Minute (Per

Minute Plan) ($)

0.10 0.10

Voice ARPU

($/month/voicesubscriber/BTS)

30.00 30.00


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Figure 12: xMax vs. WiMax For Generic Metro Area

SUMMARY

The xMax cognitive radio cellular system from xG Technology

represents a complete, scalable mobile wideband solution that is capable of

supporting a wide range of smartphones, tablets, netbooks and other end-user

devices. The coverage and capacity of the network can be tailored to the

market and business model at hand and can be rapidly reconfigured to supportnew or expanded applications or territories.

The system has been deployed and demonstrated in disparate settings

including a military environment at Fort Bliss and at rural cellular operator

sites in Florida and Arkansas. This flexibility to serve disparate markets stems

from the xG Technology affordable and rapidly deployable all-IP architecture.

While xMax incorporates several state-of-the-art and proprietary

technologies such as dynamic spectrum access and multi-spatial interference

mitigation, it also leverages COTS end user devices including 3G and 4G


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smartphones, tablets, netbooks, etc. These advanced features increase

operational and deployment flexibility while also improving the utilization of

scarce spectrum resources. xMaxs cognitive networking technology is

frequency agnostic and can be adapted to a wide array of TV white spaces,

unlicensed and licensed frequency bands.

The xMax systems cognitive networking capability allows it to

dynamically access and optimize available spectrum resources, while also

enabling it to optimize its own RF plan. Future software releases will enable

an automatically self-organizing network (SON) in direct support of xMaxs

operation as a mobile ad hoc network (MANET and MESH).

Finally, its end-to-end IP network architecture supports mobile voice,

wideband data, real time video, chat and other apps over a single integrated

network, unlike typical 3G and 4G networks that require separate voice and

data network equipment and transport layers.

For all these reasons, operators seeking to enter the mobile business

either domestically or internationally will find that xMax represents a practical

and attractive technical solution.


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REFERENCE:

WWW.CONNECTED-ANALYSIS.COM

WWW.FARPOINTGROUP.COM

WWW.SALBAC.COM

WWW.xGTECHNOLOGY.COM
http://www.connected-analysis.com/http://www.farpointgroup.com/http://www.salbac.com/http://www.xgtechnology.com/http://www.xgtechnology.com/http://www.salbac.com/http://www.farpointgroup.com/http://www.connected-analysis.com/


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CONCLUSION

This xMax Seminar Helps us to understand the basic concept of

xMax Network Structure and itapplications,About the cognitive radio. The

seminar also introduces the new Technology i.e. xMax Patented technology,

its Specification and Applications.

Documents

Xmax Seminar