In order to guarantee the quantity of data traffic delivered in the network, congestion control strategy is adopted.
According to the study of many active queue management (AQM) algorithms, this paper proposes a novel active queue
management algorithm named JFED. JFED can stabilize queue length at a desirable level by adjusting output traffic rate
and adopting a reasonable calculation of packet drop probability based on buffer queue length and traffic jitter; and it
support burst packet traffic through the packet delay jitter, so that it can traffic flow medium data. JFED impose effective
punishment upon non-responsible flow with a full stateless method. To verify the performance of JFED, it is
implemented in NS2 and is compared with RED and CHOKe with respect to different performance metrics. Simulation
results show that the proposed JFED algorithm outperforms RED and CHOKe in stabilizing instantaneous queue length
and in fairness. It is also shown that JFED enables the link capacity to be fully utilized by stabilizing the queue length at
a desirable level, while not incurring excessive packet loss ratio.
This paper proposed a scalable architecture of IPv4-IPv6 internetworking gateway based on EZchip 10Gbps network processor NP-1c. The Application Layer Gateway(ALG) of control plane can be upgraded without needing to modify the data forwarding plane.A SIP ALG of 3GPP IMS(IP Multimedia Subsystem)was implemented and tested under real China Next Generation Internet(CNGI) network environment.IPv4 SIP UEs can communicate with IPv6 SIP UEs through the gateway.
With the rapid increase of Ethernet speed, it is of necessity to improve transport performance of Ethernet physical
channel. Based on frame structure defined in IEEE Std 802.3, a kind of frame structure comprising forward error
correction (FEC) contents is presented. A FEC method based on the frame structure is brought forward. The method
includes error correction functions as well as a mechanism to detect the performance of the physical channel and adjust
the FEC configuration adaptively in order to decrease the cost brought by the FEC method. An Ethernet interface using
the FEC method can interwork with an ordinary non FEC Ethernet interface. Detailed analysis for performance of the
FEC method is given too. A kind of network device that realizes the FEC functions is designed and a test topology is set
up to test and evaluate the FEC method.
It is necessary to transport TDM (time division multiplexing) over packet network such as IP and Ethernet, and
synchronization is a problem when carrying TDM over the packet network. Clock methods for TDM over packet
network are introduced. A new adaptive clock method is presented. The method is a kind of timestamp based adaptive
method, but no timestamp needs transporting over packet network. By using the local oscillator and a counter, the
timestamp information (local timestamp) related to the service clock of the remote PE (provide edge) and the near PE
can be attained. By using D-EWMA filter algorithm, the noise caused by packet network can be filtered and the useful
timestamp can be extracted out. With the timestamp and a voltage-controlled oscillator, clock frequency of near PE can
be adjusted the same as clock frequency of the remote PE. A kind of simulation device is designed and a test network
topology is set up to test and verify the method. The experiment result shows that synthetical performance of the new
method is better than ordinary buffer based method and ordinary timestamp based method.
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