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

case shown in Figure 4.17 is similar to the first case but there is not any creation for new
BNR, the data packet delivery is similar to case1.

Therefore, SReM is effective and of less latency in delivering of multicast packets.

RqM0

RpMo

RqM0

RpMo

RqMo

RpMo

RqM0

RpMo

RqMo

RqM0

RpMo

RpMo

Figure 4.17 Data packet delivery in MCM in case no new BNR created

4.5.3 Multicasting in unconfirmed mode

In some circumstance, the multicast source doesn’t need to be aware of which are receiving
the data packets sent, but it needs to know the receivers in a statistical point of view. In this
case, BNRs and LMRs do not need to wait for registration reply messages (RpMs) from the
source and can immediately multicast packets to receivers as soon as they are in place to
deliver multicast packets. Clearly, this process of delivery of multicast packets is faster than
that in MCM, referred as multicasting in unconfirmed mode (MUCM) in this thesis. This
process of delivering of multicast packets has two cases, depending on the presence of new
BNR formed, which are similar to the previous multicasting mode cases and shown in Figure
4.18 shows the data packet delivery in MUCM in case a new BNR created and Figure 4.19
shows the data packet delivery in MUCM in case no new BNR created.

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