Abstract
In this paper, we address adaptive link switching over heterogeneous wireless access networks including IEEE 802.11. When an IEEE 802.11 link is congested, the transmission link of a terminal with multi-RATs (radio access technologies) is switched to another radio access systems. To this end, we propose link-level metrics of LC (link cost) and AC (access cost) for quantifying TCP congestion over IEEE 802.11 networks. The proposed metric can be easily measured at a local wireless terminal, and that enables each multi-RAT terminal to work in a distributed way. Through various indoor and outdoor experiments using a test-bed system, we verify that the proposed link level metrics are good indicators of TCP traffic congestion. Experimental results show that the proposed metrics can detect congestion occurrence quickly, and avoid the TCP throughput degradation of other neighboring terminals, when they are used for transmission link switching.
Original language | English |
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Pages (from-to) | 1043-1052 |
Number of pages | 10 |
Journal | IEICE Transactions on Communications |
Volume | E94-B |
Issue number | 4 |
DOIs | |
Publication status | Published - 2011 Apr |
Keywords
- Congestion metric
- Heterogeneous wireless network
- IEEE 802.11
- Link-level measurement
- Transmission link switching
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering