
Incentives 125
by interchanging the roles of j and k in Equation (5.56). Let us illustrate the
peer-to-peer relationship with the following numerical example.
Consider three neighboring c lients: x, y, and z whose types are 0.65, 0.45,
and 0.45, respectively. If they indepe ndently stream the media from the server,
x will subsc ribe to 6 stripes while both y and z will subscribe to 4 stripes.
However, they may collaborate and form a peer-to-peer r e lationship for media
streaming, as illustrated in Figure 5 .25(b). For y a nd z, each of them subsc ribes
to 3 stripes from the server and pe riodically sends them to the coordinator,
x. On the other hand, ...