17-11-2012, 02:20 PM
The 4G report
[attachment=39992]
Overlay Networks
An overlay network is a virtual network that is implemented "on
top of" another network, typically for the purpose of performing a
specific function. Examples of overlay networks in the Internet
include virtual private networks (VPNs) and Peer-to-Peer
networks. The purpose of an overlay-network approach in 4G is to
integrate the variety of network access methods, providing
seamless communications access to users.
UAPs
Universal access points (UAPs) make up the primary point-ofpresence
of an overlay network. When a user accesses a UAP,
the user's device selects a wireless network based on availability,
QoS specifications, and any other user-defined choices if
required. The UAP may store user, network, and device
information, capabilities, and preferences, and performs protocol
and frequency translation, content adaptation, and QoS
negotiation-renegotiation on behalf of the user. The overlay
network also performs handoffs as the user moves from one UAP
to another. Because UAPs can track resource usage by user, this
architecture provides one way of enabling single-source billing
and subscription.
IPv6 Enables Wide Variety of Access
Devices
The adoption of IPv6 will allow the acceptance of a wide variety of
devices onto the network. Devices will be developed for an
unlimited variety of tasks, of which voice-related applications will
be but one variant.
These heterogeneous devices will provide specialized functions
- that is, future mobile devices may perform only some of the
roles that today's mobile devices perform and several devices
(some mobile, some not) will work in concert to the benefit of the
user. For example, a stationary large-screen device may be
designed to sense the presence of a nearby mobile terminal
(known today as a "cell phone") and serve as its display on an
ad-hoc basis - depending on the preferences, capabilities, and
pre-existing business arrangements associated with the owner
of the mobile terminal.
NTT DoCoMo
DoCoMo, NEC and Fujitsu have proposed a technology for an
orthogonal frequency and code division multiplexing (OFCDM)
system as a candidate for 4G which increases throughput to
1Gbps at a bandwidth of 100MHz. DoCoMo is also currently
experimenting with Variable Spreading Factor-Orthogonal
Frequency and Code Division Multiplexing (VSF-OFCDM).
DoCoMo expects VSF-OFCDM to enable transmission at up to
100Mbps outdoors and up to 1Gbps indoors.
[attachment=39992]
Overlay Networks
An overlay network is a virtual network that is implemented "on
top of" another network, typically for the purpose of performing a
specific function. Examples of overlay networks in the Internet
include virtual private networks (VPNs) and Peer-to-Peer
networks. The purpose of an overlay-network approach in 4G is to
integrate the variety of network access methods, providing
seamless communications access to users.
UAPs
Universal access points (UAPs) make up the primary point-ofpresence
of an overlay network. When a user accesses a UAP,
the user's device selects a wireless network based on availability,
QoS specifications, and any other user-defined choices if
required. The UAP may store user, network, and device
information, capabilities, and preferences, and performs protocol
and frequency translation, content adaptation, and QoS
negotiation-renegotiation on behalf of the user. The overlay
network also performs handoffs as the user moves from one UAP
to another. Because UAPs can track resource usage by user, this
architecture provides one way of enabling single-source billing
and subscription.
IPv6 Enables Wide Variety of Access
Devices
The adoption of IPv6 will allow the acceptance of a wide variety of
devices onto the network. Devices will be developed for an
unlimited variety of tasks, of which voice-related applications will
be but one variant.
These heterogeneous devices will provide specialized functions
- that is, future mobile devices may perform only some of the
roles that today's mobile devices perform and several devices
(some mobile, some not) will work in concert to the benefit of the
user. For example, a stationary large-screen device may be
designed to sense the presence of a nearby mobile terminal
(known today as a "cell phone") and serve as its display on an
ad-hoc basis - depending on the preferences, capabilities, and
pre-existing business arrangements associated with the owner
of the mobile terminal.
NTT DoCoMo
DoCoMo, NEC and Fujitsu have proposed a technology for an
orthogonal frequency and code division multiplexing (OFCDM)
system as a candidate for 4G which increases throughput to
1Gbps at a bandwidth of 100MHz. DoCoMo is also currently
experimenting with Variable Spreading Factor-Orthogonal
Frequency and Code Division Multiplexing (VSF-OFCDM).
DoCoMo expects VSF-OFCDM to enable transmission at up to
100Mbps outdoors and up to 1Gbps indoors.