Abstract— This paper introduces a multiple access scheme called
CDMA/PRMA with Piggybacked Reservation, which employ High
Altitude Platforms (HAPs) as innovative wireless base station with
balanced cell coverage, to achieve higher statistical multiplexing
efficiency in the mixed CBR / VBR /ABR (constant, variable, and
available bit rate) traffic environment. The idea is to use HAP as
mobile communication assisted system with almost equal paths to
communication nodes, while reducing signal impairment. The
adopted scheme exploits reservation access mechanism. The
reservation is assigned in a separate slice of the frame (reservation
mini frame) while the rest of the frame is allotted to the
communication traffic. The second level exploits the piggybacked
reservation with multimode video encoder to deal with the
dynamic nature of VBR traffic in order to increase the channel
access efficiency. The expediency of the adopted schemes is
insured through the simulation of an isolated cell environment.
The obtained results indicated that, a substantial increase in the
number of heterogeneous users is attained within the intended
QoS level. |
