gher requirements for transmission link capacity. Figure 9.4 shows the transmission bit rates for the single-peak/all- average (Alterna- tive A) and the single user peak rate requirement (Alternative B). Each has its merits; in practice, one consideration is how costly it is to carry out possible capacity upgrades in the future, if dimensioning follows the lower end. With the assumption of a sub-6-GHz band, a macro-cell site (three-sector configu- ration, 100 MHz bandwidth) needs around 2.0-4.3 Gbps capacity. The single user peak rate (2 Gbps) requirement is lower than the single sector peak rate in this case. 1 Gbps Ethernet port speed is inadequate, and this makes the 10 Gbps port the preferred choice for F1 and NG interface links. 9 Transport Air interface Transmission bit rates Frequency Bandwidth Sector Single User Alternative A: Alternative B: streams streams Air if based Single-user peak rate based 2 sector config. >60 GHz 5 GHz TDD 50 Gbps 25 Gbps F1: 58 Gbps F1: 29 Gbps NG: 59 Gbps NG: 30 Gbps 800 MHz 2 sector config. 24-39 F1: 6.9 Gbps 12 Gbps 6 Gbps F1: 14 Gbps NG: 14 Gbps NG: 7.1 Gbps 3.3-4.8 100 MHz 3 sector config. F1: 2.3 Gbps 4 Gbps 2 Gbps F1: 4.6 Gbps NG: 4.7 Gbps NG: 2.4 Gbps 20 MHz 3 sector config. F1: 0.29 Gbps <1 GHz 0.2 Gbps 0.2 Gbps F1: 0.29 Gbps NG: 0.30 Gbps NG: 0.30 Gbps Figure 9.4 Backhaul capacity (NG, F1) requirement. On higher frequency bands, capacities of the air interface grow rapidly, and tens of Gbps rates are needed to match the air interface, going to more than 50 Gbps if 5 GHz air bandwidth is available in the future with >60 GHz frequencies. The single user peak rate requirement on the 24-39 GHz band is 6 Gbps, which can be fulfilled by around 7 Gbps transport capacity and again with a 10 Gbps port. In addition to user plane flows, transport links carry the mobile network control plane, management plane, some transport control flows, and possibly synchronization plane flows. While important in other respects, these traffic types typically require orders of magnitude less tha