Multimedia traffic is expected to be supported in the next generation wireless
networks. As in wireline networks, the wireless network must also be capable
of providing guaranteed quality of service (QoS) over the lifetime of mobile
connections. Some challenging problems that appear in multimedia wireless
networks, such as user mobility and shortage of bandwidth, influence the
QoS provisioning for the users.
In this thesis, we propose a new framework called Adaptive quality of service
(AdQoS) to guarantee the QoS of multimedia traffic. The objectives that
AdQoS framework tries to accomplish are minimum new call blocking and
handoff dropping rates. The key feature of this framework is the bandwidth reallocation scheme. This scheme is developed to control the bandwidth
operation of ongoing connections when the system is overloaded.
The other key feature is the bandwidth reservation scheme incorporating a
user mobility prediction to manage the QoS of the networks. Based on the
mobility prediction, bandwidth is reserved to guarantee the uninterrupted
hand off process. A comparison between existing user mobility prediction and
the proposed scheme is also presented.
An integrated system, which combines the Bandwidth Allocation Level
technique and the user mobility prediction, is also proposed. The proposed
user mobility prediction algorithm integrates the Received Signal Strength
(RSS) measurements for the mobile terminal's intra-cell movement and
aggregate history of mobile terminals for inter-cell movement.
When compared with the conventional scheme proposed in the literature, the
simulation results show that our proposed scheme reduces the new call
blocking probabilities, the handoff dropping probabilities and reduces
significantly the probability of terminating calls while still maintaining
efficient bandwidth usage
