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The allocation of functions between the RU and CU, i.e., the functional split, has a major impact on the transport network and the corresponding NGFI requirements regarding data rate, latency, and synchronization.
The I-T functional split correlates closely with the argument structure of the base verb an I-function is associated with a transitive verb but its T-function counterpart with a ditransitive verb, as nicely predicted by the generalization in 47.
Fig. 1 Functional split options.
In this regard, this functional split is very similar to BH links in current networks.
Figure 4 shows the current approach for this functional split in 3GPP.
The chapter discusses the functional split between radio access network and core network.
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For the lower functional splits, the data rates range from 35 to almost 200 Gbps per cell.
Therefore, functional splits, where the transport rates are proportional to the actual utilization, should be considered for future 5G systems.
Hence, it is important to understand the transport requirements introduced by the 5G RATs and functional splits considered under practical network conditions as done in the following.
In this work, we focus on three functional splits, which are capturing the most relevant trade-offs, denoted as A, B, and C1 in Fig. 1.
We showed how new functional splits can avoid a costly increase in necessary transport capacity which, otherwise, would be required by new technologies like mmWave and massive MIMO.
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