scheme, intra- more, the maximum uplink transmission power of cell power control is fundamentally not necessary and the a single terminal is typically significantly lower than the benefits with channel-dependent scheduling become output power of a base station. This has a significant more similar to the downlink case. In principle, from an impact on the scheduling strategy. Unlike the downlink, intra-cell perspective, a terminal can transmit at full where pure TDMA often can be used, uplink scheduling power and the scheduler assigns a suitable part of the typically has to rely on sharing in the frequency and/or orthogonal resources (in practice a suitable part of the code domain in addition to the time domain as a single overall bandwidth) to the terminal for transmission. terminal may not have sufficient power for efficiently The remaining orthogonal resources can be assigned to utilizing the link capacity. other users. However, implementation constraints, for Channel-dependent scheduling is, similar to the example leakage between the received signals or limited downlink case, beneficial also in the uplink case. How- dynamic range in the receiver circuitry, may pose re- ever, the characteristics of the underlying radio interface, strictions on the maximum tolerable power difference most notably whether the uplink relies on orthogonal or between the signals from simultaneously transmitting non-orthogonal multiple access and the type of link terminals. As a consequence, a certain degree of power adaptation scheme used, also have a significant impact on control may be necessary, making the situation somewhat the uplink scheduling strategy. similar to the non-orthogonal case. In case of a non-orthogonal multiple-access scheme The discussion on non-orthogonal and orthogonal such as CDMA, power control is typically essential for multiple access mainly considered intra-cell multiple proper operation. As discussed earlier in this chapter, the access. However, in many practical systems universal purpose of power control 