Design and investigation of scalable multicast recursive protocols for wired and wireless ad hoc networks

In the second scenario a DBT change has happened because of roaming of mobile node x.
This scenario can happen in one of the following cases:

J Case 1 : the mobile receiver x is the last receiver attached to oLMR and it is not
the first mobile receiver attached to the nLMR.

J Case 2: the mobile receiver x is not the last receiver attached to oLMR but it is
the first mobile receiver attached to the nLMR.

J Case 3: the mobile receiver x is the last receiver attached to oLMR and it is the
first mobile receiver attached to the nLMR.

All of these cases will cause a DBT update, including BNRs update and MFTs update at

BNRs.

Figure 5.1 Roaming process in (case 1)

Starting with case 1, Figure 5.1 shows this case; when roaming is transport to the
receivers, it will send an Rm_out message towards its oLMR (M2). Upon receiving this
message and checking its MDT, x’s oLMR (M2) will be aware that it will no longer be a
multicast branch. As a result, N3 will delete its M2 entry in its MFT for the multicast

106

<<   117   118   119   120   121   122   123   >>

More intriguing information