Priority forwarding for improving the TCP performance in mobile IP based networks with packet buffering

22nd International Conference on Advanced Information Networking and Applications (Aina 2008)

Lim

Chung

2008

Proxy Mobile IPv6 is one of network-based mobility support protocols which does not require a mobile host to be involved in mobility support signaling. Even though Proxy Mobile IPv6 has many advantages than client-based mobility support protocols such as Mobile IPv6, unfortunately, it may cause an out-of-sequence problem during its route optimization procedure. Thus, in this paper, we develop an estimation function for an outof-sequence time period and reveal the out-of-sequence problem caused by the route optimization procedure. Then we propose a scheme which minimizes the arrival of out-of-sequence packets to the mobile host and analyze the impact of out-of-sequence packets. The performance evaluation results demonstrate that the traffic rate and out-of-sequence time period mainly have an effect on the out-of-sequence problem.

Section: B Traffic Variationmentioning

confidence: 97%

Section: Mhs Variationmentioning

confidence: 99%

Preventing Out-of-Sequence Packets on the Route Optimization Procedure in Proxy Mobile IPv6

22nd International Conference on Advanced Information Networking and Applications (Aina 2008)

Lim

Chung

2008

“…For instance, it generates duplicate acknowledgements at the TCP layer so that the CN falls into the fast retransmit and fast recovery phases [19]. Thus, the congestion window in the TCP layer is reduced and the throughput of the CN thus is significantly decreased.…”

Section: Traffic Variationmentioning

confidence: 98%

“…The size of the buffered packets is proportional to λ and is hard to determine within various traffic environments. However, we can consider that the transmission buffer in an access point settles λ of MNs [19,20]. In other words, λ is always less than or equal to the size of transmission buffer in the access point.…”

Section: Mns Variationmentioning

confidence: 99%

Tunnel Restraint to Prevent Out-of-Order Packets for Route Optimization in Proxy Mobile IPv6

Kim

2011

Wireless Pers Commun

Route optimization (RO) developed for Proxy Mobile IPv6 (PMIPv6) aims at reducing the packet transmission cost. However, as we present in this paper, the RO procedure may cause out-of-order packets. In this paper, we propose a tunnel restraint scheme to minimize out-of-order packets during a mobile node (MN)'s handover by utilizing a developed estimation function that calculates an amount of out-of-order packets in the RO procedure. In the proposed tunnel restraint scheme, buffering techniques at proxy mobility agents are adopted to minimize the arrival of out-of-order packets to the MN. The proxy mobility agents taking part in the RO procedure buffer the packets for the MN until they establish the RO tunnel between them. The conducted performance evaluation results show that the traffic rate and the time period of out-of-order packets mainly have effects on the out-of-order packets problem. We also demonstrate that the proposed tunnel restraint scheme enhances the performance of PMIPv6 RO by minimizing the number of out-of-order packets.

2012 IEEE/ACIS 11th International Conference on Computer and Information Science

“…A separate RED packet buffer will be used for each and every hand-overed mobile node to store its in-flight packets at base station [11]. A priority buffer [16] is used to store the buffered forwarded packets of mobile node whenever the usual input RED buffer of current mobile node base station is congested. Network simulator (NS2-2.29) is used for simulating the mobile network and to calculate the packet loss at foreign agents, packet delivery ratio, throughput and performance of Transmission Control Protocol.…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement of TCP in Mobile IP Based Networks

Anamalamudi

Liu

2012

In mobile IP based networks, most of the packet drops occur due to mobile handoff from one sub-network to another sub-network or larger delays in between sender and receiver due to encapsulation and tunnelling of packets. Packet loss during the handoff operation in mobile IP with route optimization and smooth handover will degrade the performance of Transmission Control Protocol (TCP). To prevent performance degradation due to mobile handover packet drops, a number of packet buffering and packet forwarding mechanisms have been proposed. However, mobile user continually change its point-of-attachment and can sometimes move into congested base station of foreign agent sub network, its buffered forwarded packets are likely to be dropped at the new base station. This can lead to decrease in congestion window size at the sender TCP, which will severely degrade the performance of TCP even though there is no congestion within the network. In this approach, hardware resources (packet buffers) are efficiently utilized, at the same time performance degradation of TCP due to congested base station of current mobile node is minimized through packet buffers, markers and with modification in Mobile IP binding update message.