RBB 6601 Radio Building Block

2.1 RBBs Each RBB defines a unique way of combining RUs or RRUs in one sector with connections to DUs and the antenna system.

RBBs are named as follows: RBB[Tx][Rx]_[C][V], where: Tx Number of Transmitter (TX) branches Rx

Number of Receiver (RX) branches (excluding co-siting RX ports)

C

Number of CPRI links

V

Version

Example: RBB12_1A     2.1.1

One TX branch Two RX branches One CPRI link between DU and RU or RRU Version A

RBB10_1A

RBB10_1A is used for sectors with one TX branch, two external RX branches, and one CPRI connection. Figure 2 shows the RBB10_1A block diagram.

Figure 2 2.1.2

RBB10_1A Block Diagram

RBB11_1A

RBB11_1A is used for sectors with one TX branch, two RX branches, of which one is an external RX branch for antenna sharing, and one CPRI connection. Figure 3 shows the RBB11_1A block diagram.

Figure 3 2.1.3

RBB11_1A Block Diagram

RBB12_1A

RBB12_1A is used for sectors with one TX branch, two RX branches, and one CPRI connection. Figure 4 shows the RBB12_1A block diagram.

Figure 4 2.1.4

RBB12_1A Block Diagram

RBB22_1A

RBB22_1A is used for sectors with two TX branches, two RX branches, and one CPRI connection. There is an analog cross-connection between the RUs or RRUs. Figure 5 shows the RBB22_1A block diagram.

Figure 5 2.1.5

RBB22_1A Block Diagram

RBB22_1B

RBB22_1B is used for sectors with two TX branches, two RX branches, and one CPRI connection. Note:

It is also possible to use only one TX branch.

Figure 6 shows the RBB22_1B block diagram.

Figure 6 2.1.6

RBB22_1B Block Diagram

RBB22_1C

RBB22_1C is used for sectors with two TX branches, two RX branches, and one CPRI connections. There is a digital cross-connection between the RUs or RRUs. Figure 7 shows the RBB22_1C block diagram.

Figure 7 2.1.7

RBB22_1C Block Diagram

RBB12_2A

RBB12_2A is used for sectors with one TX branch, two RX branches, and two CPRI connection. This RBB is used for Mixed Mode with no CPRI sharing. Figure 8 shows the RBB12_2A block diagram.

Figure 8

RBB12_2A Block Diagram

2.1.8

RBB22_2A

RBB22_2A is used for sectors with two TX branches, two RX branches, and two CPRI connections. This RBB uses a digital RX cross-connection. Figure 9 shows the RBB22_2A block diagram.

Figure 9 2.1.9

RBB22_2A Block Diagram

RBB22_2B

RBB22_2B is used for sectors with two TX branches, two RX branches, and two CPRI connections. There is an analog cross-connection between the RUs or RRUs. Figure 10 shows the RBB22_2B block diagram.

Figure 10 2.1.10

RBB22_2B Block Diagram

RBB22_2E

RBB22_2B is used for sectors with two TX branches, two RX branches, and two CPRI connections. This RBB is used for Cross-Sector Antenna Sharing Redundancy. Each RRU can serve two different sectors. Figure 11 shows the RBB22_2E block diagram.

Figure 11 2.1.11

RBB22_2E Block Diagram

RBB22_4B

RBB22_4B is used for sectors with two TX branches, two RX branches, and four CPRI connections. This RBB uses an analog RX cross-connection. This RBB is used for Mixed Mode with no CPRI sharing. Figure 12 shows the RBB22_4B block diagram.

Figure 12

RBB22_4B Block Diagram

2.1.12

RBB24_2A

RBB24_2A is used for sectors with two TX branches, four RX branches, and two CPRI connections. This RBB uses a digital RX cross-connection. Figure 13 shows the RBB24_2A block diagram.

Figure 13 2.1.13

RBB24_2A Block Diagram

RBB32_3A

RBB32_3A is used for sectors with three TX branches, two RX branches, and three CPRI connections. There is an analog cross-connection between the RUs or RRUs. Figure 14 shows the RBB32_3A block diagram.

Figure 14 2.1.14

RBB32_3A Block Diagram

RBB32_3B

RBB32_3B is used for sectors with three TX branches, two RX branches and one external RX cross connection, and three CPRI connections. There is an analog cross-connection between the RUs or RRUs. Figure 15 shows the RBB32_3B block diagram.

Figure 15 2.1.15

RBB32_3B Block Diagram

RBB43_4A

RBB43_4A is used for sectors with four TX branches, three RX branches, and four CPRI connections. There is an analog cross-connection between the RUs or RRUs. Figure 16 shows the RBB43_4A block diagram.

Figure 16

RBB43_4A Block Diagram