| Presentation | 2006-01-26 A study on method for increasing capacity in mobile IP phone systems using the W-CDMA systems during large scale disasters Yoshitaka KAWADE, Kazunori OKADA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | When a massive disaster occurs, communication demands increase suddenly and greatly because people want to check on their families and friends in the stricken area. Mobile phones are very useful communication tools for these situations because of their portability. However, increasing the capacity of mobile systems is difficult due to limited radio-frequency resources. Therefore, we propose the lower limit of voice quality call admission control (LLQCAC) for mobile IP telephone systems using W-CDMA systems, which will be widespread in the future. This control will increase the number of admitted calls in order to surpass the system capacity by decreasing voice quality to a lower limit for conversation. Furthermore, we propose the reduction control of forced call termination (RCFCT) to combat the increase in the number of forced call terminations by using the LLQCAC. This will adjust the threshold of the decision for forced call termination properly. We evaluated the basic characteristics of the LLQCAC and the RCFCT through computer simulations. The call blocking rate was much reduced by admitting calls at the lowest limit of voice quality, and forced call termination was reduced by increases in the number of continuous packet loss allowed, which is the threshold of the decision for forced call termination. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Emergency communications / Congestion control / W-CDMA / VoIP / QoS / Forced call termination |
| Paper # | CQ2005-85 |
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| Conference Information | |
| Committee | CQ |
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| Conference Date | 2006/1/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Communication Quality (CQ) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A study on method for increasing capacity in mobile IP phone systems using the W-CDMA systems during large scale disasters |
| Sub Title (in English) | |
| Keyword(1) | Emergency communications |
| Keyword(2) | Congestion control |
| Keyword(3) | W-CDMA |
| Keyword(4) | VoIP |
| Keyword(5) | QoS |
| Keyword(6) | Forced call termination |
| 1st Author's Name | Yoshitaka KAWADE |
| 1st Author's Affiliation | National Institute of Information and Communications Technology, Information Security Center:The University of Electro-Communications, Graduate School of Information Systems() |
| 2nd Author's Name | Kazunori OKADA |
| 2nd Author's Affiliation | National Institute of Information and Communications Technology, Information Security Center:The University of Electro-Communications, Graduate School of Information Systems |
| Date | 2006-01-26 |
| Paper # | CQ2005-85 |
| Volume (vol) | vol.105 |
| Number (no) | 564 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |