Integrating SIP-Based Network Mobility into IP Multimedia Subsystem

Route optimization for roaming heterogeneous multi-homed mobile networks

“…According to our literature survey, the only noteworthy initiation made towards this is available in [7]. Despites its comprehensive overview on various coupling architectures [7] and their vertical session handoff capabilities, seamless session continuity was not guaranteed [8]. For that reason, we argue that, this article proposes a novel framework capable of collectively handling seamless session handoffs and optimizing data routes for the nodes of a mobile network travelling through interworked heterogeneous wireless networks by using the SIP-NEMO protocol.…”

“…According to our literature survey, the only noteworthy initiation made towards this is available in [7]. Despites its comprehensive overview on various coupling architectures [7] and their vertical session handoff capabilities, seamless session continuity was not guaranteed [8].…”

“…The point to note in this case is that, our proposed solution is based on a make-before-break handoff, which is therefore capable of assuring seamless session handoffs for the SIP-NMS clients, unlike the solution given in [7]. Next, a REGISTER request is sent to the mobile network's SIP-HS by the SIP-NMS.…”

An optimized QoS scheme for IMS‐NEMO in heterogeneous networks

“…Then, it works by processing the sessions with the number of media flows from k to 1. For the session with the number of media flows as l, each of its service s l,i is processed as follows (lines [5][6][7][8][9][10][11][12][13][14][15]: if its number of non-real-time flow (i.e. n v,s i,l ) is 0 or idle is 0 (line 14), it means that this service needs to request l units of bandwidth and thus l is increased by s l,i (i.e.…”

“…Otherwise, it first checks whether current idle bandwidth idle can serve the non-real-time flows of all its sessions (line 6). If so (lines [11][12], it means that this service needs to request l −n nr,s l,i units of bandwidth and thus (l−n nr,s l,i ) is increased by s l,i and idle is decreased by n nr,s l,i s l,i ; otherwise, the idle bandwidth can only serve the non-real-time flows of idle /n nr,s l,i sessions, and for the other s l,i − idle /n nr,s l,i sessions, each still needs to request l units of bandwidth, thus s l,i is decreased by idle /n nr,s l,i , (l−n nr,s l,i ) is increased by idle /n nr,s l,i and idle is set to 0 (lines 7-9).…”