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| Now, the Internet of IPv4 only provides “best-effort” service. But the real-time applications have developed widely such as voice over IP(VoIP) and video-on-demand(VoD), and they need higher QoS(Quality of Service). The core of any QoS scheme will be how to monitor and manage traffic flows that have guaranteed QoS. The two QoS approaches used in the literature are Int-Serv(Integrated service) and Diff-Serv(Differentiated service). Int-Serv uses the resource reservation protocol(RSVP)for signaling the path. Decisions on QoS requests are taken by each router independently. Diff-Serv uses bandwidth brokers as a QoS Management model to negotiate request, communicate with edge nodes and track reservations. To support QoS, Flow Label field has been proposed in the IPv6 header, which can be used to specify the QoS requirements. In this paper, we propose a QoS scheme using a modified Flow Label. We discuss how to process the Flow Label field in the Int-Serv and Diff-Serv models respectively and we give a detail specification of the 20 bits of the Flow Label field. |
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| Keywords:QoS,Int-Serv,Diff-Serv,IPv6,Flow Label. |
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