Base band unit (BBU) and method for measuring optical fiber delay thereof
A baseband processing and processing unit technology, applied in optical fiber transmission, optical fiber radio, electrical components, etc., to reduce the number of detection times, the algorithm and process are simple and clear, and the measurement efficiency is improved
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Embodiment 1
[0057] The applicant of the present invention considers that when the main optical port of the BBU is the home optical port of a certain RRU, the standby optical port of the BBU is the home optical port of another RRU, and there is no optical fiber directly connected between the two RRUs. When establishing a C&M channel, it can be calculated that the fiber delay between the two RRUs is equal to half of the delay difference of the 5ms frame header of the downlink optical port of a certain RRU. Wherein, the home optical port refers to the BBU optical port carrying the RRU C&M data, that is, the C&M channel is established on the optical fiber directly or indirectly connected between the main optical port or the backup optical port of the BBU and the RRU. In this way, the number of detection times of RRU parameters can be reduced, and the measurement efficiency is also greatly improved.
[0058] Based on the above ideas, this embodiment provides an optimal solution for the BBU to ...
Embodiment 2
[0071] The following takes the redundant fiber delay measurement between two directly connected RRUs in the RRU ring networking mode as an example, and introduces the process of the BBU calculating the fiber delay between the two RRUs.
[0072] Such as Figure 4 As shown, RRU1 and RRU2 are connected to the BBU through a ring network. Among them, RRU1 establishes a C&M channel with the BBU through the uplink optical fiber Tx-A_Rx-X and downlink optical fiber Tx-X_Rx-A; RRU2 establishes a C&M channel with the BBU through the uplink optical fiber Tx-D_Rx-Y and downlink optical fiber Tx-Y_Rx-D. In this way, the delay measurement of the optical fiber with the C&M channel can be completed through the standard procedure specified in the IR protocol. However, for the fibers directly connected between RR1 and RRU2 (Tx-B_Rx-C and Tx-C_Rx-B), since the C&M channel has not been established, the C optical port transmit and receive buffer delay Trxc_txc of RRU2 cannot be reported to the BB...
Embodiment 3
[0082] In this embodiment, the fiber delay measurement of the optical fiber between the BBU and the RRU is taken as an example in the RRU multi-point connection networking mode, and introduces the process of the BBU calculating the optical fiber delay of the optical fiber between the BBU and the RRU. Among them, the first optical port of the BBU is connected to the uplink optical port of the RRU by an optical fiber, and a control and maintenance channel is established on the optical fiber, and the second optical port of the BBU is directly connected by an optical fiber to the downlink optical port of the RRU, and no control and maintenance is established on the optical fiber. aisle. When the BBU calculates the fiber delay of the fiber for which no control and maintenance channel has been established between the BBU and the RRU, half of the delay difference of the 5ms frame header of the downlink optical port of the RRU, or the 5ms of the second optical port of the BBU Half of ...
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