enerated to other transmission, the second best user according to the simultaneously transmitting terminals in the cell must scheduling strategy is selected and assigned (a fraction be taken into account. Stated differently, the received of) the residual resources and SO on. power (and thus the data rate) is, thanks to power Finally, it should also be noted that the scheduling control, in principle constant, regardless of the channel algorithm typically is a base-station-implementation conditions at the time of transmission, while the issue and nothing that is normally specified in any stan- transmitted power depends on the channel conditions at dard. What needs to be specified in a standard to support the time of transmission. Hence, even though channel- channel-dependent scheduling is channel-quality mea- dependent scheduling in this example does not give surements/reports and the signaling needed for dynamic a direct gain in terms of a higher data rate from the resource allocation. terminal, channel-dependent scheduling will still pro- vide a gain for the system in terms of lower intra-cell 4.5.2.2 Uplink scheduling interference. The above discussion on non-orthogonal multiple The previous section discussed scheduling from a down- access was simplified in the sense that no bounds on the link perspective. However, scheduling is equally appli- terminals transmission power were assumed. In practice, cable to uplink transmissions and to a large extent the the transmission power of a terminal is upper-bounded, same principles can be reused although there are some both due to implementation and regulatory reasons, and differences between the two. scheduling a terminal for transmission in favorable chan- Fundamentally, the uplink power resource is distrib- nel conditions decreases the probability that the terminal uted among the users, while in the downlink the power has insufficient power to utilize the channel capacity. resource is centralized within the base station. Further- In case of orthogonal multiple-access 