Title :
Adaptive handoff algorithms using absolute and relative thresholds for cellular mobile communication systems
Author :
Senarath, Gamini ; Abu-Dayya, Adnan ; Matyas, Rolbert
Author_Institution :
Dept 2W21, Nortal, Ottawa, Ont., Canada
Abstract :
In cellular mobile networks, efficient handoff performance entails minimizing unnecessary handoffs without risking desired handoffs which could lead to increased dropped calls. An adaptive relative-threshold (hysteresis) algorithm has been proposed by Senarath and Everitt (see Proc. VTC´93, 1993) to effectively identify and prevent unnecessary handoffs. However, results here show that this adaptive algorithm can cause undesired cell-dragging. We propose an adaptive, absolute-threshold algorithm to be used in combination with the adaptive relative-threshold algorithm to mitigate cell dragging. The performance of the algorithm is investigated for an IS-136 TDMA system using a powerful network level simulator. Results show that, depending on the propagation environment, the proposed algorithm can reduce received signal strength (RSS) based handoff triggers by up to 75% while maintaining a lower call drop-rate and less cell dragging than fixed threshold algorithms
Keywords :
adaptive systems; cellular radio; digital simulation; radio networks; time division multiple access; IS-136 TDMA system; adaptive absolute-threshold algorithm; adaptive relative-threshold algorithm; call drop-rate; cell-dragging; cellular mobile communication systems; cellular mobile networks; dropped calls; fixed threshold algorithms; handoff performance; hysteresis algorithm; network level simulator; propagation environment; received signal strength; Adaptive algorithm; Base stations; Bit error rate; Cellular networks; Hysteresis; Interference; Mobile communication; Relays; Switches; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686560