30-05-2012, 01:19 PM
WIRELESS COMMUNICATIONS IN NETWORKED ROBOTICS
[attachment=23516]
Wireless multihop communications: Wireless multihop
communications has been a key research issue in recent
years in both academia and the wireless industry. It
includes ad hoc radio networks, sensor networks, wireless
mesh networks, and mobile multihop relay systems. With multihop
capability, wireless communications can be combined
with cooperative communications and network coding,
which have attracted even more researchers. In many
wireless multihop networks the merits of capacity enhancement
and coverage extension go beyond the delay caused
by multihop relay. However, there are unresolved issues
that may not necessarily be technical; one question regards
the motivation of a relay node to allow packet relay for
others by consuming its own energy. There is also a security
issue in multihop communications: one’s own data
transmission is received by someone else in close proximity.
Multiple hops also increase latency and jitter, which is problematic
if real-time communication is needed. In this
regard there is still controversy over commercialization of
wireless multihop communications.
Node mobility: In wireless communications node mobility
is an important service to users. On the other hand,
mobility does not come free, as one needs to deal with
channel fading on both large and small scales. Handling
node mobility has been a difficult task in all layers of communication
protocols. Recently, there has been a group of
researchers investigating exploitation of node mobility for
enhancing network capacity. Nevertheless, node mobility is
regarded as uncontrollable in wireless system design. However,
if we could control node mobility (position, speed, etc.), we
might then think of cross-layer optimization with node
mobility (e.g., mobility and MAC, mobility and routing,
mobility and transport control). Still, it is not clear in which
applications we can control node mobility and take that into
acount for cross-layer optimization.
Networked robots: Multiple robots with communication
functions have been studied in the automatic control and
robotics society. While it started with a client-server type communication
prototype
between robots and an
access point, it has now
evolved toward teams of
robots supported by wireless
ad hoc networks. The main
motivation for connecting
the robots is to achieve a
common mission of the
robots in a distributed and
parallel manner. In many practical applications this approach
is more efficient and economical than the approach with a single
intelligent robot. Recently, many researchers note
group behaviors found in small insects or animals such as ants,
birds, and fish,
[attachment=23516]
Wireless multihop communications: Wireless multihop
communications has been a key research issue in recent
years in both academia and the wireless industry. It
includes ad hoc radio networks, sensor networks, wireless
mesh networks, and mobile multihop relay systems. With multihop
capability, wireless communications can be combined
with cooperative communications and network coding,
which have attracted even more researchers. In many
wireless multihop networks the merits of capacity enhancement
and coverage extension go beyond the delay caused
by multihop relay. However, there are unresolved issues
that may not necessarily be technical; one question regards
the motivation of a relay node to allow packet relay for
others by consuming its own energy. There is also a security
issue in multihop communications: one’s own data
transmission is received by someone else in close proximity.
Multiple hops also increase latency and jitter, which is problematic
if real-time communication is needed. In this
regard there is still controversy over commercialization of
wireless multihop communications.
Node mobility: In wireless communications node mobility
is an important service to users. On the other hand,
mobility does not come free, as one needs to deal with
channel fading on both large and small scales. Handling
node mobility has been a difficult task in all layers of communication
protocols. Recently, there has been a group of
researchers investigating exploitation of node mobility for
enhancing network capacity. Nevertheless, node mobility is
regarded as uncontrollable in wireless system design. However,
if we could control node mobility (position, speed, etc.), we
might then think of cross-layer optimization with node
mobility (e.g., mobility and MAC, mobility and routing,
mobility and transport control). Still, it is not clear in which
applications we can control node mobility and take that into
acount for cross-layer optimization.
Networked robots: Multiple robots with communication
functions have been studied in the automatic control and
robotics society. While it started with a client-server type communication
prototype
between robots and an
access point, it has now
evolved toward teams of
robots supported by wireless
ad hoc networks. The main
motivation for connecting
the robots is to achieve a
common mission of the
robots in a distributed and
parallel manner. In many practical applications this approach
is more efficient and economical than the approach with a single
intelligent robot. Recently, many researchers note
group behaviors found in small insects or animals such as ants,
birds, and fish,