Self-Configuration and Administration of Wireless Grids - Cloud, Grid and High Performance Computing: Emerging Applications - page 262

SELF-CONFIGURING AND SELF-
ADMINISTERING DYNAMIC
ADDRESS SERVICES ACROSS
VIRTUAL ORGANIZATIONS

due to the mobile nature of the grid com-
ponents. Grids should provide self-config-
uring and self-administering capability to
allow these dynamic changes for all pos-
sible grid layouts.
• Routing Plasticity: Efficient routing pro-
tocols are required to address the power
limitation of the end devices along with
the consideration for stable wireless con-
nectivity, route optimization and efficient
use of the limited bandwidth.
• Discovery Semantics and Protocols:
Service description protocols are needed to
describe the services provided by various
components of the wireless grid. Once the
services are published, a discovery proto-
col is needed to map the mobile resources
to the services.
• Security: Because of the inherent nature
of the wireless connection, the diversity of
the link quality, the potential unreliability
of the end-devices, the power constraints
of the mobile device, and the enforcement
of security and privacy policies all present
major challenges in the wireless grid en-
vironment. Effective security requires ad-
equate computational power to execute the
security algorithms in acceptable times. In
addition, sufficient radio power is required
to achieve an effective signal-to-noise ratio
(in the face of encrypted signaling streams)
and to close the link. This suggests a care-
ful husbanding of access points and the
hand-over to ensure that the minimum pos-
sible power is required from each of the
wireless devices.
• Policy Management: Grid architecture
designers need to address policies that
govern the usage, privileges, access to re-
sources, sharing level agreements, quality
of service, and the composability and the
automated resolution of contradictory poli-
cies among organizations; as well as other
technical issues mentioned above.

To flourish, grids must exist for the benefit of the
members and users. To add tangible value, infra-
structures that support wireless grids must address
the issue of dynamic updates to the grid to account
for network node failure, and the entry or exit of
nodes. Previous work on Self-Configuring and
Self-Administering Domain Name Service (DNS)
has led to a reliable, intelligent and distributed
lightweight protocol for automatically adapting to
the changes in the networks (Huck et. al., 2002);
this protocol can be modified and extended for
use in the wireless grid environment.

Grid Topology

Several researchers have evaluated the topology
and configuration of mobile networks (Nesargi
and Prakash, 2002; Vaidya, 2002; Mohsin and
Prakash, 2002; Weniger and Zitterbart, 2004).
However, these ad hoc systems are standalone
in nature. We believe that the commercial grids
will possess some access to the wired Internet
infrastructure and thereby follow a hybrid model
(figure 2). It will consist of Mobile Ad-hoc Net-
works (MANET) type systems with multiple-hop
paths between mobile nodes and access points
to the wired network. An application of this hy-
brid setup has been the Mesh Networks (Bruno
et al. 2005). Data will need to flow across the
grid using a combination of Mobile IP (Perkins,
2002) or the new Mobile IPv6 and Ad-Hoc rout-
ing protocols such as Dynamic Source Routing
Protocol (DSR) (Hu, Perrig and Johnson, 2005)
and Ad hoc On-Demand Distance Vector Routing
(AODV) (Perkins and Royer, 1999; Papadimitra-
tos and Haas, 2005).At a high level, one needs to
support the critical role of the management and
composition of subnets and arbitrary collections
of wireless members. There must be a Root Sta-