RFCPRI Line Rates Explained: Rate-1 to Rate-10
cpri
line rate
wcdma
lte
transport capacity
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This page covers CPRI line rates. The table covers CPRI line rate-1,2,3,4,5,6,7A,7,8,9 and 10. The transport capacity of WCDMA and LTE AxC are also mentioned.
Introduction
The CPRI (Common Public Radio Interface) is a popular standard to transport baseband I/Q signals to the radio unit in a Base Station. It allows efficient as well as flexible I/Q data interface for various wireless standards such as GSM, WCDMA, LTE etc. It uses one physical connection for user data, management and control signaling and synchronization.
CPRI Line Rate Table
| CPRI Line Rate | Line Bit Rate | Line Coding | Bits per word | Transport capacity (#WCDMA AxC) | Transport capacity (#20 MHz LTE AxC) |
|---|---|---|---|---|---|
| Rate-1 | 0.6144 Gbps | 8B/10B | 8 | 4 | - |
| Rate-2 | 1.2288 Gbps | 8B/10B | 16 | 8 | 1 |
| Rate-3 | 2.4576 Gbps | 8B/10B | 32 | 16 | 2 |
| Rate-4 | 3.0720 Gbps | 8B/10B | 40 | 20 | 2 |
| Rate-5 | 4.9152 Gbps | 8B/10B | 64 | 32 | 4 |
| Rate-6 | 6.1440 Gbps | 8B/10B | 80 | 40 | 5 |
| Rate-7A | 8.1100 Gbps | 64B/66B | 128 | 64 | 8 |
| Rate-7 | 9.8304 Gbps | 8B/10B | 128 | 64 | 8 |
| Rate-8 | 10.1376 Gbps | 64B/66B | 160 | 80 | 10 |
| Rate-9 | 12.1651 Gbps | 64B/66B | 192 | 96 | 12 |
| Rate-10 | 24.3302 Gbps | 64B/66B | 384 | 192 | 24 |
CPRI transports I/Q data of particular antenna and particular carrier. This “unit” is called an AxC unit or Antenna-Carrier unit.
Example: In LTE system, if I=16 bits and Q=16 bits then one AxC is of length 32 bits.
