Image Processing Reference
In-Depth Information
than a CoS may need currently, the resource over-reservation. In this way, several
requests can be processed without instant signaling as long as previous reservation
surplus is sufficient to accommodate new requests [
16
,
17
]. However, the approach
imposes a trade-off between signaling overhead reduction and waste of resources
including QoS violations [
18
]. The waste occurs when residual resources (over-
reserved but unused) cannot be properly reused, while QoS violations happen when
wrong admission decisions lead to accepting more requests than a reservation can
accommodate. In view of this, recent findings [
19
] claimed that resource over-
reservation solution can avoid waste by implementing adequate networking archi-
tecture and resource distribution protocol that are able to monitor network resource
conditions without signaling the network unnecessarily.
Furthermore, it is broadly accepted in the research community that the Internet
design needs urgent reconsideration. Many proposals [
20
] including “clean slate”
approach have been put forward. The Open Networking Foundation (ONF), a
non-profit and mutually beneficial trade organization, was founded to improve
networking performance through the Software Defined Networking (SDN) [
21
]
and its OpenFlow protocol [
22
] standard. SDN is a networking paradigm which
consists of decoupling the control plane (software that controls network behaviour)
from the data plane (the devices that forward traffic). The main idea is to make
networking control and the management flexible, so one can build the network in
many different ways by programming the control logic in terms of architectures,
protocols and policies through the control plane. Hence, the SDN deployment
cannot simply rely on the traditional control algorithms or solutions to optimize
QoS and energy saving performance in a scalable manner.
Therefore, this chapter aims to provide a cooperative communication approach
that is able to integrate with advanced resource over-reservation techniques [
23
]in
such a way as to improve energy efficiency, QoS and scalability in an end-to-end
fashion. In particular, an SDN controller will be deployed in service provider
'
s
network to assure a proper control of the provider
s overall infrastructure on one
hand and the cooperative communication behaviours on the other hand. This will
allow taking into account not only the access network and users
'
context informa-
tion, but also the impact of cooperative communication on the control plane in such
a way as to optimize the overall performance. For example, a user may not be
handed over to another base station unless it ensures better performance in terms of
both energy efficiency and QoS guarantee on end-to-end basis, depending on the
SDN local control policies. Hence, there is a big potential for further energy
efficiency improvement by integrating the wired and the wireless networks and
centralizing the resource management of the whole network in a single SDN entity.
This chapter is organized as follows. Section
8.2
explores cooperative commu-
nications with focus on the most related work and proof-of-concept for energy
saving. Section
8.3
focuses on QoS control mechanisms and provides the most
related work and proof-of-concept for efficient signaling overhead reduction.
Then, Sect.
8.4
describes our novel approach and key guidelines for efficient
integration of cooperative communications and resource over-reservation, aiming
at end-to-end energy saving and QoS support towards the future network control
designs. Finally, Sect.
8.5
concludes the chapter.
'
