24-03-2011, 11:56 AM
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WIRELESS INTERNET ACCESS: 3G VS .Wifi?
ABSTRACT:
This paper compares and contrasts two technologies for delivering broadband wireless Internet access services:"3G" VS."WiFi". The former, 3G, refers to the collection of third generation mobile technologies that are designed to allow mobile operators to offer integrated data and voice services over mobile networks .The latter, WiFi, refers to the 802.11b wireless Ethernet standard that was designed to support wireless LANs. Although the two technologies reflect fundamentally different service, industry and architectural design goals, origins and philosophies, each has recently attracted a lot of attention as candidates for the dominant platform for providing broadband wireless access to the Internet. It remains an open question as to the extent to which these two technologies are in competition or, perhaps, may be complementary. If they are viewed as in competition, then the triumph of one at the expense of the other would be likely to have profound implications for the evolution of the wireless internet and structure of the service provider industry.
INTRODUCTION:
The two most important phenomena impacting telecommunications over the past decade have been explosive parallel growth of both the internet and mobile telephone services. The internet brought the benefits of data communications to the masses with email, the web, and ecommerce; while mobile service has enabled "follow-me anywhere/always on" telephony. The internet helped accelerate the trend from voice-centric to data-centric networking. Data already exceeds voice traffic and the data share continues to grow. Now these two worlds are converging. This convergence offers the benefits of new interactive multimedia services coupled to the flexibility and mobility of wireless. To realize the full potential of this convergence, however, we need broadband access connections.
Here we compare and contrast two technologies that are likely to play important roles: Third Generation mobile ("3G") and Wireless Local Area Networks ("WLAN") . The former represents a natural evolution and extension of the business models of existing mobile providers. In contrast, the WiFi approach would leverage the large installed base of WLAN infrastructure already in place. We use 3G and WiFi as
shorthand for the broad classes of related technologies that have two quiet distinct industry origins and histories.
Speaking broadly, 3G offers a vertically -integrated , top -down , service -provider approach to delivering wireless internet access , while WiFi offers an end -user -centric , decentralized approach to service provisioning. We use these two technologies to focus our speculations on the potential tensions between these two alternative world views. The wireless future will include a mix of heterogenous wireless access technologies. Moreover, we expect that the two world views will converge such that vertically-integrated service providers will integrate WiFi or other WLAN technologies into their 3G or wire line infrastructure when this make sense. The multiplicity of potential wireless access technologies and /or business models provided some hope that we may be able to realize robust facilities - based competition for broadband local access services. If this occurs, it would help solve the "last mile" competition problem that has been deviled telecommunication policy.
SOME BACKGROUND ON WiFi AND 3G
3G:
3G is a technology for mobile service providers. Mobile services are provided by service providers that own and operate their own wireless networks and sell mobile services to and -users. Mobile service providers use licensed spectrum to provide wireless telephone coverage over some relatively large contiguous geographic service area. Today it may include the entire country. From a user's perspective, the key feature of mobile service is that it offers ubiquitous and continuous coverage. To support the service, mobile operators maintain a network of interconnected and overlapping mobile base stations that hand-off customers as those customers move among adjacent cells. Each mobile base station may support user's upto several kilometers away. The cell towers are connected to each other by a backhaul network that also provides interconnection to the wire line Public Switched Telecommunications Network (PSTN) and other services. The mobile system operator owns the end-to-end network from the base stations to the backhaul networks to the point of interconnection to the PSTN. Third Generations (3G) mobile technologies will support higher bandwidth digital communications. To expand the range and capability of data services that can be supported by digital mobile systems, service providers will have to upgrade their networks to one of the 3G technologies which can support data rates of from 384Kbps up to 2Mbps.
WiFi
WiFi is the popular name for the wireless Ethernet 802.11b standard for WLANs . WiFi allows collections of PCs, terminals ,and other distributed computing devices to share resources and peripherals such as printers, access servers etc. One of the most popular LAN technologies was Ethernet.
WiFi LANs operate using unlicensed spectrum in the 2.4 GHz band . The current generation of WLANs supports upto 11Mbps, data rates within 300 feet of the
base station. Most typically , WLANs are deployed in a distributed way to offer last -few - hundred - feet connectivity to a wire line backbone corperate or campus network. Typically, the WLANs are implemented as part of a private network. The base station equipment is owned and operated by the end-user community .Although each base station can support connections only over a range of few hundred feet, it is possible to provide contiguous coverage over a wider area by using multiple base stations. Still, the WLAN technology was not designed to support high-speed hand - off associated with users moving between base station coverage areas.
There has been an emergence of a number of service providers that are offering WiFi services for a fee in selected local areas . In addition, there is a growing movement of so - called "Free Nets" where individuals or organizations are providing open access to subsidized WiFi networks
HOW ARE WiFi AND 3G SAME
From the preceding discussion, it might appear that 3G and WiFi address completely different user needs in quiet distinct markets that do not overlap. While this was certainly more true about earlier generations of mobile services when compared with wired LANs or earlier versions of WLANs , it is increasingly not the case. The end- user does not care what technology is used to support his service. What matter is that both of these technologies are providing platforms for wireless access to the internet and other communication services.
We shall focus on the ways in which the two technologies may be thought of as
similar.
A.BOTH ARE WIRELESS
Both technologies are wireless which
(1) Avoids need to install cable drops to each device when compared to wire line
alternatives.
(2) Facilities mobility,
Wireless infrastructure may be deployed more rapidly than wire line alternatives to respond to new market opportunities or changing demand. Wireless technologies also facilitate mobility. This includes both
(1) The ability to move devices around having to move cables and furniture and
(2) The ability to stay continuously connected over wider serving areas.
3G offers much narrower bandwidth but over a wider covering area and with more support for rapid movement between base stations. Although it is possible to cover a wide area with WiFi , it is most commonly deployed in a local area with one or a few base stations being managed as a separate WLAN .
This has implications for the magnitude of initial investment required to bring up WLAN or 3G wireless service .It is unclear at this time which type of network might be lower cost for equivalent scale deployments.
B. BOTH ARE ACCESS TECHNOLOGIES.
Both 3G and WiFi are access or edge/network technologies. This means they offer alternatives to the last- mile wireline network. Beyond the last -mile , both rely on similar network connections and transmission support infrastructure. For 3G, the wireless page link is from the end- user device to the cell base station ( up to a few kilometers) and then dedicated wireline facilities to interconnect base station to the carrier's backbone
For WiFi , the wireless page link is a few hundred feet from the end-user device to the base station. The base station is then connected either into the wireline LAN or enterprise network infrastructure or to a wireline access line to a carrier's backbone network and then eventually to the internet . Wireless service are part of an end-to-end value chain that includes , in its coarsest delineation atleast
(1) The internet backbone ( the cloud )
(2) The second mile network providers (ILEC ,mobile , cable, or a NextGen carrier (1) The last mile access facilities ( and, beyond them, the end-user devices ).
WIRELESS INTERNET ACCESS: 3G VS .Wifi?
ABSTRACT:
This paper compares and contrasts two technologies for delivering broadband wireless Internet access services:"3G" VS."WiFi". The former, 3G, refers to the collection of third generation mobile technologies that are designed to allow mobile operators to offer integrated data and voice services over mobile networks .The latter, WiFi, refers to the 802.11b wireless Ethernet standard that was designed to support wireless LANs. Although the two technologies reflect fundamentally different service, industry and architectural design goals, origins and philosophies, each has recently attracted a lot of attention as candidates for the dominant platform for providing broadband wireless access to the Internet. It remains an open question as to the extent to which these two technologies are in competition or, perhaps, may be complementary. If they are viewed as in competition, then the triumph of one at the expense of the other would be likely to have profound implications for the evolution of the wireless internet and structure of the service provider industry.
INTRODUCTION:
The two most important phenomena impacting telecommunications over the past decade have been explosive parallel growth of both the internet and mobile telephone services. The internet brought the benefits of data communications to the masses with email, the web, and ecommerce; while mobile service has enabled "follow-me anywhere/always on" telephony. The internet helped accelerate the trend from voice-centric to data-centric networking. Data already exceeds voice traffic and the data share continues to grow. Now these two worlds are converging. This convergence offers the benefits of new interactive multimedia services coupled to the flexibility and mobility of wireless. To realize the full potential of this convergence, however, we need broadband access connections.
Here we compare and contrast two technologies that are likely to play important roles: Third Generation mobile ("3G") and Wireless Local Area Networks ("WLAN") . The former represents a natural evolution and extension of the business models of existing mobile providers. In contrast, the WiFi approach would leverage the large installed base of WLAN infrastructure already in place. We use 3G and WiFi as
shorthand for the broad classes of related technologies that have two quiet distinct industry origins and histories.
Speaking broadly, 3G offers a vertically -integrated , top -down , service -provider approach to delivering wireless internet access , while WiFi offers an end -user -centric , decentralized approach to service provisioning. We use these two technologies to focus our speculations on the potential tensions between these two alternative world views. The wireless future will include a mix of heterogenous wireless access technologies. Moreover, we expect that the two world views will converge such that vertically-integrated service providers will integrate WiFi or other WLAN technologies into their 3G or wire line infrastructure when this make sense. The multiplicity of potential wireless access technologies and /or business models provided some hope that we may be able to realize robust facilities - based competition for broadband local access services. If this occurs, it would help solve the "last mile" competition problem that has been deviled telecommunication policy.
SOME BACKGROUND ON WiFi AND 3G
3G:
3G is a technology for mobile service providers. Mobile services are provided by service providers that own and operate their own wireless networks and sell mobile services to and -users. Mobile service providers use licensed spectrum to provide wireless telephone coverage over some relatively large contiguous geographic service area. Today it may include the entire country. From a user's perspective, the key feature of mobile service is that it offers ubiquitous and continuous coverage. To support the service, mobile operators maintain a network of interconnected and overlapping mobile base stations that hand-off customers as those customers move among adjacent cells. Each mobile base station may support user's upto several kilometers away. The cell towers are connected to each other by a backhaul network that also provides interconnection to the wire line Public Switched Telecommunications Network (PSTN) and other services. The mobile system operator owns the end-to-end network from the base stations to the backhaul networks to the point of interconnection to the PSTN. Third Generations (3G) mobile technologies will support higher bandwidth digital communications. To expand the range and capability of data services that can be supported by digital mobile systems, service providers will have to upgrade their networks to one of the 3G technologies which can support data rates of from 384Kbps up to 2Mbps.
WiFi
WiFi is the popular name for the wireless Ethernet 802.11b standard for WLANs . WiFi allows collections of PCs, terminals ,and other distributed computing devices to share resources and peripherals such as printers, access servers etc. One of the most popular LAN technologies was Ethernet.
WiFi LANs operate using unlicensed spectrum in the 2.4 GHz band . The current generation of WLANs supports upto 11Mbps, data rates within 300 feet of the
base station. Most typically , WLANs are deployed in a distributed way to offer last -few - hundred - feet connectivity to a wire line backbone corperate or campus network. Typically, the WLANs are implemented as part of a private network. The base station equipment is owned and operated by the end-user community .Although each base station can support connections only over a range of few hundred feet, it is possible to provide contiguous coverage over a wider area by using multiple base stations. Still, the WLAN technology was not designed to support high-speed hand - off associated with users moving between base station coverage areas.
There has been an emergence of a number of service providers that are offering WiFi services for a fee in selected local areas . In addition, there is a growing movement of so - called "Free Nets" where individuals or organizations are providing open access to subsidized WiFi networks
HOW ARE WiFi AND 3G SAME
From the preceding discussion, it might appear that 3G and WiFi address completely different user needs in quiet distinct markets that do not overlap. While this was certainly more true about earlier generations of mobile services when compared with wired LANs or earlier versions of WLANs , it is increasingly not the case. The end- user does not care what technology is used to support his service. What matter is that both of these technologies are providing platforms for wireless access to the internet and other communication services.
We shall focus on the ways in which the two technologies may be thought of as
similar.
A.BOTH ARE WIRELESS
Both technologies are wireless which
(1) Avoids need to install cable drops to each device when compared to wire line
alternatives.
(2) Facilities mobility,
Wireless infrastructure may be deployed more rapidly than wire line alternatives to respond to new market opportunities or changing demand. Wireless technologies also facilitate mobility. This includes both
(1) The ability to move devices around having to move cables and furniture and
(2) The ability to stay continuously connected over wider serving areas.
3G offers much narrower bandwidth but over a wider covering area and with more support for rapid movement between base stations. Although it is possible to cover a wide area with WiFi , it is most commonly deployed in a local area with one or a few base stations being managed as a separate WLAN .
This has implications for the magnitude of initial investment required to bring up WLAN or 3G wireless service .It is unclear at this time which type of network might be lower cost for equivalent scale deployments.
B. BOTH ARE ACCESS TECHNOLOGIES.
Both 3G and WiFi are access or edge/network technologies. This means they offer alternatives to the last- mile wireline network. Beyond the last -mile , both rely on similar network connections and transmission support infrastructure. For 3G, the wireless page link is from the end- user device to the cell base station ( up to a few kilometers) and then dedicated wireline facilities to interconnect base station to the carrier's backbone
For WiFi , the wireless page link is a few hundred feet from the end-user device to the base station. The base station is then connected either into the wireline LAN or enterprise network infrastructure or to a wireline access line to a carrier's backbone network and then eventually to the internet . Wireless service are part of an end-to-end value chain that includes , in its coarsest delineation atleast
(1) The internet backbone ( the cloud )
(2) The second mile network providers (ILEC ,mobile , cable, or a NextGen carrier (1) The last mile access facilities ( and, beyond them, the end-user devices ).
