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Overview of QoS Solutions
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A number of solutions have been developed to address the QoS issue These solutions approach the problem from various angles One approach is to ensure that resources for a given session are available and reserved for that session prior to establishing the session Conceptually, this approach has certain similarities to circuit switching, where the bandwidth needed for a call is reserved for that call before the called party s phone rings Another approach is to categorize traffic into different classes or priorities with higher-priority values assigned to real-time applications, such as voice, and lower-priority values assigned to non-real-time traffic, such as email In some ways, this approach is easier to implement, but it requires that no one application can totally shut another out Just because there is voice on a network that supports voice and data applications does not mean that the data never gets a reasonable share of resources Therefore, the need exists to implement fair resource allocation techniques Finally, perhaps the most common technique today is overprovisioning the network, that is, provisioning greater bandwidth than the traffic
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Quality of Service (QoS)
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demand would require After all, a lack of bandwidth is often the reason for packet delay or loss Bandwidth costs money, however, and needs to be utilized efficiently
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Allocating more bandwidth might sound like a very simplistic and expensive approach to QoS simple because it does not require major system development, but expensive because it means significant overbuild This overbuild would need to exist so that network resources would be available in times of traffic bursts Unfortunately, the additional bandwidth would remain unused for most of the time That method would be a very inefficient way of solving the QoS problem, but it does have some merit and should not be dismissed completely We live in an age where huge advances continue to be made in squeezing bandwidth from facilities that appeared to have reached their limit Not that long ago, a 9,600-baud modem was considered almost a utopian situation for a modem connection Now, 56 Kbps modems are standard for dialup access, and Digital Subscriber Line (DSL) technology means that homes can have several megabits per second in each direction1 And this is just in the access part of the network In the core of the network, we now have Dense Wave Division Multiplexing (DWDM) offering the capability to support tens of gigabits per second and hundreds of gigabits per second in the future on a single optical fiber Consequently, as these new transmission techniques have become available, the cost of bandwidth has been decreasing and will likely continue to decrease On the other hand, however, Moore s Law says that computing power doubles roughly every 18 months, which means that applications are demanding bandwidth at an ever-increasing rate In addition, the number of Internet users continues to increase The result is that the demand for bandwidth is increasing rapidly Although we currently have a glut of transmission capacity (a good deal of excess dark fiber currently exists), that situation will not last forever Historically, bandwidth availability and bandwidth demand have tended to move almost in lock-step This is simply a supply and demand issue If bandwidth is scarce, then applications that
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DSL has many variants The most common is Asymmetric DSL (ADSL), which can theoretically provide up to 640 Kbps uplink and up to 9 Mbps downlink Whether a given customer experiences these rates is a different issue with commercial as well as technical considerations
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Quality of Service (QoS)
Quality of Service (QoS)
require high bandwidth are either not developed because they would be impossible or too expensive to use, or they are deployed only in a limited scope Once more bandwidth becomes available, however, a major barrier to the deployment of such applications is removed and application developers can proceed with implementing new ideas They can do so without worrying about a bandwidth demand that might have been unconscionable a short time earlier Therefore, excess bandwidth is often needed, if only to support additional traffic as demand continues to grow Although additional bandwidth is a necessity for a network that is required to support voice in addition to the data traffic that may have been carried all along, excess bandwidth is not by itself a complete solution to the QoS issue Mechanisms need to be in place to manage the available bandwidth so that it is used most effectively to support the services provided
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