Performance evaluation of a DECT based wireless PABX

Abstract

The DECT standard, born to meet the increasing demand for cordless communications, faces the necessify to tu? gexible enough to hold high traffic in small ranges. rc ?void frequency planning in such limited areas as offices or airport halls, a new radio feature has been developed: Dynamic Channel Selection (DCS).This feature has been investigated to see its effect on capacity in high traffic indoor environment, in the most typical operating conditions.

Mobility modeling and traffic analysis in three-dimensional indoor environments

“…1) A three-story building of 60 m 60 m 9 m is considered [10], [11]. The increase in the ratio of vertical motions yields more handoffs because the mean number of vertical motion handoffs is larger than that of horizontal motion handoffs under the given assumptions.…”

“…If we especially consider the horizontal motion at the boundary of the staircase region on the th floor, we have the following relation: (10) Equation (10) can be rewritten as (11) For vertical motion, we have a similar relation (12) The right term in (8), that is, the mean number of handoffs in the staircase region can be converted into this form (13) From (7)-(9), we can see that and are required in order to obtain the mean number of handoffs during a call. Utilizing (11)-(13), we obtain (14) From (11), (12), and (14), we can determine and to satisfy the balance equation 12when and is fixed or vice versa. Using , we can obtain in (11).…”

“…Utilizing (11)-(13), we obtain (14) From (11), (12), and (14), we can determine and to satisfy the balance equation 12when and is fixed or vice versa. Using , we can obtain in (11). If we consider the mean number of handoffs on the first floor, we can obtain the similar equations given in (10)- (14).…”

Mobility modeling and traffic analysis in three-dimensional high-rise building environments

“…The number of handoffs during a call, is expressed as (12) where and are random variables representing the number of cells visited and handoffs during a call, respectively. The mean number of cells visited during a call in nonblocking models is given by (13) Combining (12) and (13) yields (14) From 14, we can observe that is obtained by the mean number of handoffs during a call. The ratio of mean call to idle durations with mobility is (15) where is both blocking and handoff failure probabilities when a handoff call has no priority over a new call and is the ratio of mean call to idle durations of stationary users [9].…”

Industrial wireless networking with resource constraint devices

“…The robust communication performance we are targeting in a harsh industrial environment, seems achievable with a digital communication standard developed by the European Telecommunications Standards Institute (ETSI), namely DECT [64][65][66][67][68][69]. Thus, we use DECT as a reference point for this chapter.…”