Network configurations for seamless support of CDMA soft handoffs between cell clusters

Abstract

In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission.

Call admission control for wireless personal communications

“…During the call admission phase, the decision process of CAC is repeated over all the hops to ensure that sufficient resources are available to support the entire new connection. A significant amount of work on CAC has been done for the wireline domain alone [13,16,27,28,34,36,39,40,47,64,78,80], for the wireless domain alone [17,53,67], and for both [2,3,19,21,49,65,66,85]. The works on CAC for connection oriented wireline networks (such as ATM networks) are more matured and there are usually less challenges involved.…”

Network configurations for seamless support of CDMA soft handoffs between cell-clusters

“…The following mobility model is developed for stop-and-go vehicular traffic through microcells covering the city blocks in an urban center. While it is not considered here, the model is readily modified to account for pedestrian traffic with a lower level of mobility [17].…”

“…When the total number of channels is about 69, all three probabilities are approximately equalized. 17. New call and overall handoff blocking probability versus total number of channels in direct and crosslinks at o = 2300/h/cell in Configuration II.…”

“…can be expressed in terms of state probability and (13) where is given by the following equation [13]: (14) The blocking probability that a handoff call is blocked in direct link is given by (15) The weighted blocking probability of direct link for all calls is as follows: (16) For crosslink the probability that is blocked given that is not blocked is given by (3) with arrival rate mean service time and The probability that is blocked given that is blocked is given by the equation of a two-dimensional (2-D) Markov chain [22]: (17) where and The mean service time in the Erlang load is simply the sum of two mean service times and The blocking probability for crosslink is as follows: The blocking probability for handoffs between the two cell clusters is given by (19) Again, subject to the constraint that the total number of channels in and equals 62, the cell-cluster handoff blocking probability can be minimized with respect to the dimensions of links and For /h/cell, Fig. 9 shows that 52 channels should be assigned to direct link and the remaining ten channels to crosslink in order to minimize However, note that is much less sensitive to the channel partition compared to Table III shows the traffic parameters for scheme in Configuration I and the channel dimensions minimizing at /h/cell.…”

“…A secondary contribution of this paper is the development of a mobility model of vehicular users in stop-and-go traffic moving through the microcells covering the streets in a city center. Although we have not done so in this paper, the mobility model is easily extended to account for pedestrian users [17].…”