07-05-2012, 04:21 PM
Context management for efficient mobile multicast services
[attachment=21494]
INTRODUCTION
With the rapid deployment of different kind of wireless
technologies and building of heterogeneous mobile networking
environments, the issue of adapting of existing and design of
novel services based on context considerations of different
wireless networks for efficient handover and QoS support
increased in importance. For example, context could be used for
rapid reestablishment of mobile services in case of handover and
failure, as well as for user driven wireless network selection in
case of multiple wireless network interfaces.
Actual challenge of heterogeneous mobile networking is to
support different handover scenarios considering context data and
offer context-aware interfaces for user interaction. Handover
issues of current applications need to be considered, such as
vertical handover, when the mobile node is changing the type of
wireless network and horizontal handover; based on which the
mobile node changes the attachment point (interface) using the
same type of wireless network for the delivery of the mobile
service.
MOBILE MULTICAST CONTEXT
MANAGEMENT
CONTEXT AWARE USER INTERFACE
The CARD protocol was designed to support the exchange of
context information about the capabilities of wireless network
interfaces (data link layer) and access routers (network layer) that
are candidates for the mobile node's next handover [19].
Attributes describing active multicast groups with established
routing contexts to specific sources at the candidate access routers
for a given wireless network interface were proposed to be
included in the capability descriptions of access routers and
wireless networks [11].
For the mobile user, it is important to have an Application
Programming Interface (for instance API based on socket calls) to
obtain the context (capability) information of attached wireless
networks and candidate access routers. This allows to evaluate
characteristics of possible multicast candidate access routers and
to select the optimal router for multicast service delivery in case
of handover and failure without to restart the multicast service.
MULTICAST CONTEXT TRANSFER
Context Transfer is a technology used at access networks to
transfer states (control data) related to the mobile node’s services
changing their point of attachment. It is aimed at support of the
seamless handover (roaming) based on service continuation using
contexts and could be used for transfer of different kind of control
data and resources, supporting AAA (Authentication,
Authorization and Accounting), security, and QoS based services.
Context Transfer Protocol proposed by Seamoby Working Group
[18] could be used to define control messages and procedures for
initiation and authorisation of context transfer between access
routers, as well as for transferring control data states (contexts)
related to the mobile user and its active services before, during
and after handover (roaming).
The multicast context transfer is aimed to establish the listening
and routing context data to multicast groups and optionally
specific sources required by the active multicast services of the
mobile user. It could be used in case of handover, roaming and
failures.
CONTEXT AWARE RELIABLE MULTICAST
Depending on the underlying mobile networking infrastructure,
user and application requirements, context-based approaches
could be integrated to support reliable mobile multicast:
- Context based selection of reliable multicast service
based on underlying wireless and broadcast network in
heterogeneous mobile environment
- Context transfer to support continuation of reliable
mobile multicast transmission during handover using
access routers for retransmissions.
CONCLUSION
In this paper, different aspects of context aware reliable mobile
multicast transport in heterogeneous networking environment are
discussed, which are further deployed in DAIDALOS project [3]:
- User interfaces for selection of multicast wireless
networks and access routers for seamless handover.
- Context transfer of multicast states related to mobile
node’s services during the handover.
- Integration and utilization of appropriate reliable mobile
multicast mechanisms dependent on application and
wireless network characteristics (context)
- Efficient end-to-end reliable mobile multicast schemes
supported by the access routers using contexts.
[attachment=21494]
INTRODUCTION
With the rapid deployment of different kind of wireless
technologies and building of heterogeneous mobile networking
environments, the issue of adapting of existing and design of
novel services based on context considerations of different
wireless networks for efficient handover and QoS support
increased in importance. For example, context could be used for
rapid reestablishment of mobile services in case of handover and
failure, as well as for user driven wireless network selection in
case of multiple wireless network interfaces.
Actual challenge of heterogeneous mobile networking is to
support different handover scenarios considering context data and
offer context-aware interfaces for user interaction. Handover
issues of current applications need to be considered, such as
vertical handover, when the mobile node is changing the type of
wireless network and horizontal handover; based on which the
mobile node changes the attachment point (interface) using the
same type of wireless network for the delivery of the mobile
service.
MOBILE MULTICAST CONTEXT
MANAGEMENT
CONTEXT AWARE USER INTERFACE
The CARD protocol was designed to support the exchange of
context information about the capabilities of wireless network
interfaces (data link layer) and access routers (network layer) that
are candidates for the mobile node's next handover [19].
Attributes describing active multicast groups with established
routing contexts to specific sources at the candidate access routers
for a given wireless network interface were proposed to be
included in the capability descriptions of access routers and
wireless networks [11].
For the mobile user, it is important to have an Application
Programming Interface (for instance API based on socket calls) to
obtain the context (capability) information of attached wireless
networks and candidate access routers. This allows to evaluate
characteristics of possible multicast candidate access routers and
to select the optimal router for multicast service delivery in case
of handover and failure without to restart the multicast service.
MULTICAST CONTEXT TRANSFER
Context Transfer is a technology used at access networks to
transfer states (control data) related to the mobile node’s services
changing their point of attachment. It is aimed at support of the
seamless handover (roaming) based on service continuation using
contexts and could be used for transfer of different kind of control
data and resources, supporting AAA (Authentication,
Authorization and Accounting), security, and QoS based services.
Context Transfer Protocol proposed by Seamoby Working Group
[18] could be used to define control messages and procedures for
initiation and authorisation of context transfer between access
routers, as well as for transferring control data states (contexts)
related to the mobile user and its active services before, during
and after handover (roaming).
The multicast context transfer is aimed to establish the listening
and routing context data to multicast groups and optionally
specific sources required by the active multicast services of the
mobile user. It could be used in case of handover, roaming and
failures.
CONTEXT AWARE RELIABLE MULTICAST
Depending on the underlying mobile networking infrastructure,
user and application requirements, context-based approaches
could be integrated to support reliable mobile multicast:
- Context based selection of reliable multicast service
based on underlying wireless and broadcast network in
heterogeneous mobile environment
- Context transfer to support continuation of reliable
mobile multicast transmission during handover using
access routers for retransmissions.
CONCLUSION
In this paper, different aspects of context aware reliable mobile
multicast transport in heterogeneous networking environment are
discussed, which are further deployed in DAIDALOS project [3]:
- User interfaces for selection of multicast wireless
networks and access routers for seamless handover.
- Context transfer of multicast states related to mobile
node’s services during the handover.
- Integration and utilization of appropriate reliable mobile
multicast mechanisms dependent on application and
wireless network characteristics (context)
- Efficient end-to-end reliable mobile multicast schemes
supported by the access routers using contexts.