Polling-Based High-Bit-Rate Packet Transfer in a Microcellular Network to Allow Fast Terminals

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概要

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• A microcellular network will be a good candidate for the future broadband mobile network. It is expected to support high-bit-rate connection for many fast mobile users if the handover is processed fast enough to lessen its impact on QoS requirements. One of the promising techniques is believed to use for the wireless interface in such a microcellular network is the WLAN (Wireless LAN) technique due to its very high wireless channel rate. However, the less capability of mobility support of this technique must be improved to be able to expand its utilization for the microcellular environment. The reason of its less support mobility is large handover latency delay caused by contention-based handover to the new BS (base station) and delay of re-forwarding data from the old to new BS. This paper presents a proposal of multi-polling and dynamic LMC (Logical Macro Cell) to reduce mentioned above delays. Polling frame for an MT (Mobile Terminal) is sent from every BS belonging to the same LMC — a virtual single macro cell that is a multicast group of several adjacent micro-cells in which an MT is communicating. Instead of contending for the medium of a new BS during handover, the MT responds to the polling sent from that new BS to enable the transition. Because only one BS of the LMC receives the polling ACK (acknowledgement) directly from the MT, this ACK frame has to be multicast to all BSs of the same LMC through the terrestrial network to continue sending the next polling cycle at each BS. Moreover, when an MT hands over to a new cell, its current LMC is switched over to a newly corresponding LMC to prevent the future contending for a new LMC. By this way, an MT can do handover between micro-cells of an LMC smoothly because the redundant resource is reserved for it at neighboring cells, no need to contend with others. Our simulation results using the OMNeT++ simulator illustrate the performance achievements of the multi-polling and dynamic LMC scheme in eliminating handover latency, packet loss and keeping mobile users throughput stable in the high traffic load condition though it causes somewhat overhead on the neighboring cells.

• 2009-11-01

著者

• Hoa Phan

  Ritsumeikan University

• LAMBERTSEN Gaute

  Ritsumeikan University

• YAMADA Takahiko

  Ritsumeikan University

• Yamada Takahiko

  Ritsumeikan Univ. Kusatsu‐shi Jpn

• Hoa Phan

  Ritsumeikan Univ. Kusatsu‐shi Jpn

関連論文

• Polling-Based High-Bit-Rate Packet Transfer in a Microcellular Network to Allow Fast Terminals
• BS-3-15 PON as a terrestrial network for a unified micro-cellular network(BS-3. Network Management Technologies for Next Generation Network)
• BS-10-10 Unified micro-cellular network towards 4G mobile network(BS-10. Network Controls for High-Quality Communications)
• BS-10-15 Pico-cell in a unified microcellular network to release the local congestion(BS-10. Network Planning, Control, and Management)
• SB-10-4 PON as an access network for an IP-based micro-cellular network

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