tailieunhanh - Báo cáo "Estimation on efficient of distribute channel allocation schemes for cellular network "

The efficient management and sharing of the spectrum among the users is an important issue, frequency channels have to be reused as much as possible in order to support the many thousands of simultaneous call in any typical of mobile system. In cellular architecture, cell is serviced by a base station located at its center. A number of cells are linked to a mobile switching center which also acts as a gateway of the cellular network to | VNU Journal of Science Mathematics - Physics 24 2008 171-178 Estimation on efficient of distribute channel allocation schemes for cellular network Do Huu Tri1 Vu Duy Loi2 Bui Thien Minh3 1Ministry of Information and Communication MIC 18 Nguyen Du Street Ha Noi 2Center of Information Technology Office of Central Commitee of Communist Party of Vietnam 1 Hung Vuong Street Ha Noi 3Viet Nam Post and Telecommunication Group VNPT 1 Dao Duy Anh Dong Da Street Ha Noi Received 20 March 2008 received in revised form 20 May 2008 Abstract. The efficient management and sharing of the spectrum among the users is an important issue frequency channels have to be reused as much as possible in order to support the many thousands of simultaneous call in any typical of mobile system. In cellular architecture cell is serviced by a base station located at its center. A number of cells are linked to a mobile switching center which also acts as a gateway of the cellular network to the existing wired networks liked PSTN ISDN or LAN-WAN based networks. A base station communicates with the mobile station through wireless links and with the MSC s through wire-line links. This paper deals with some estimations on efficient of distribute channel allocation scheme for cellular networks and then LBSB scheme is selected to improve it s efficient that is the first channel borrowing is not only neighbours but in compact pattern and the second when a cell become hot it repeat to borrow channel until reaching average degree of coldness of networks that mean X C. dcavr-dc . 1. Introduction Efficient of distribute channel allocation scheme is estimated by new call blocking probability drop call number of hand off delay of channel assignment and traffic. In selecting a channel assignment method the objective is to gain a high degree of spectrum utilisation for a given a quality of service with the least possible number of database lookups and simplest possible algorithms at the base station or MSC. In .