WO2012009971A1

WO2012009971A1 - Method and device for rate self-negotiation of optical interfaces

Info

Publication number: WO2012009971A1
Application number: PCT/CN2011/070473
Authority: WO
Inventors: 董耀荣
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-20
Filing date: 2011-01-21
Publication date: 2012-01-26
Also published as: CN102340352A; CN102340352B

Abstract

The present invention provides a method and device for rate self-negotiation of optical interfaces. In the prior art, there is a problem that the system rate configuration has low flexibility, because the rate of one end is unchangeable when the rate configuration is performed by the devices which communicate with each other using the optical interfaces. The method includes: the two ends implement a self-negotiation for synchronization with a handshake optical signal, configure the rate according to a rate selected from multiple rates, and receive data according to the configured rate simultaneously, wherein the rate of the data transmitted by the transmission end is the same as the configured rate; the received data is parsed, and whether the rate self-negotiation is successful is determined according to the parsing result; if the parsing result indicates that the received data is correct, the rate self-negotiation is successful. In the solution, the rate can be selected from multiple rates, so that the self-negotiation of optical interfaces can be implemented actively, which improves the flexibility of the system rate configuration.

Description

Method and device for optical port rate auto-negotiation

The present invention relates to the field of optical transmission, and in particular, to a method and apparatus for optical port rate auto-negotiation. Background technique

At present, some devices that use optical ports for communication can communicate with each other at various data rates. For example, base stations for wireless communication mainly use a baseband unit (BBU) and a radio remote unit (RRU). Part of the interconnection is through fiber optics, and the communication protocol generally uses the Common Public Radio Interface (CPRI) protocol. The CPRI protocol can support multiple data rates, including: 614.4 Mbit/s, 1228.8 Mbit/s, 2457.6 Mbit/s, 3072 Mbit/s, 4915.6 Mbit/s, 6144 Mbit/s, 98304 Mbit/s.

To communicate between the BBU and the RRU, you need to establish a physical layer connection between the optical interface between the BBU and the RRU. When there are multiple rate interfaces on the BBU and the RRU, the current technology is that the rate is fixed at one end and the rate is configured passively at the opposite end.

However, for an optical interface with multiple rate specifications on the BBU, the RRU may have multiple specifications (there is only one optical port rate for each RRU) or may support multiple optical port rates. Because one end must be rate fixed, it limits the flexibility of system rate configuration. Summary of the invention

The present invention provides a method and apparatus for auto-negotiation of optical port rate, in order to solve the problem that the rate of one end is fixed, and the rate of configuration of the system is poor. .

A method for automatically negotiating an optical interface rate according to an embodiment of the present invention includes:

Receiving a handshake optical signal sent by the transmitting end;

Selecting an optical port rate from a plurality of rates according to a predetermined policy; According to the time of receiving the handshake optical signal, the data is received at the selected optical port rate while the transmitting end sends the handshake optical signal, and the rate at which the transmitting end sends the data is selected from the multiple rates according to the predetermined policy, and is sent. The rate at which the data is sent is the same as the rate at which the receiver receives the data;

The received data is parsed. If the data is successfully parsed, the rate auto-negotiation is successful. Otherwise, the rate auto-negotiation is unsuccessful.

An embodiment of the present invention further provides an apparatus for controlling network usage, including:

a handshake optical signal receiving module, configured to receive a handshake optical signal sent by the transmitting end;

a selection module, configured to select an optical port rate from a plurality of rates according to a predetermined policy;

The data receiving module is configured to: according to the time of receiving the handshake optical signal, send data at the transmitting end after transmitting the handshake optical signal, and perform data reception at the selected rate, and the rate at which the transmitting end sends the data is from the multiple rate according to the predetermined policy. In the selection, the sending end sends the data at the same rate as the receiving end receives the data;

The state control module is configured to parse the received data. If the data is successfully parsed, the rate auto-negotiation is successful. Otherwise, the rate auto-negotiation is unsuccessful.

Due to the solution provided by the embodiment of the present invention, the optical port auto-negotiation can be actively performed by selecting multiple rates, so that the system rate configuration flexibility is better. DRAWINGS

1 is a schematic diagram of a negotiation pulse format according to an embodiment of the present invention;

2 is a flowchart of a method according to an embodiment of the present invention;

FIG. 3 is a structural diagram of an apparatus according to an embodiment of the present invention. detailed description

The technical solution of the embodiment of the present invention will be described in detail with reference to the accompanying drawings, in order to solve the problem that the rate of one end is fixed when the rate is configured by the devices that communicate with each other. The problem of poor flexibility in the configuration of the rate is that the receiver needs to receive the handshake optical signal sent by the sender. After the sender sends the handshake signal, the sender sends data at a certain time. After receiving the handshake signal, the receiver supports multiple rates from the optical port. Selecting, selecting a rate, according to the pre-policy, the sending data is sent at the same rate as the selected one, and the receiving party synchronizes with the transmitting data according to the time of receiving the handshake optical signal, and performs data reception at the selected rate. After receiving the data, the receiver determines the rate auto-negotiation based on the parsing result of parsing the received data. If the parsing result is successful, the rate auto-negotiation is unsuccessful. In this way, the optical port auto-negotiation can be actively performed by selecting the rate.

Specifically, the status of the optical signal of the optical port is first monitored, and the status is counted when the optical signal is monitored from being lost to returning to normal. For convenience of description, the status is recorded as the optical interface status (OIS), the count value is recorded as the optical interface status count value (OISN), an OIS status is detected, OISN is incremented by 1, the OIS record is checked, and the rate auto-negotiation is initiated. process. The OIS is cleared, and the power-off command is sent to the optical port, so that the opposite end can detect the lost state of the optical signal. After the optical port performs the optical power-off command, the feedback execution completes the response, and then sends the optical power to open the command to the optical port. When the optical port performs a shutdown and turns on the optical power, it sends a handshake optical signal to the opposite end. After the optical power is turned on, the OISN value is monitored. The optical power of the opposite end is turned off and then the response is sent to wait for the handshake signal sent by the opposite end. signal. The peer end may also actively send a handshake optical signal. The local end monitors the OISN value and then performs an optical power off operation, and responds to the handshake signal of the opposite end to complete the handshake at both ends. After completing the handshake, wait for a long time. During this time, you will receive the second handshake signal from the opposite end, and then clear the OISN count value. After clearing, wait for a long time, and the optical power will stabilize. After the above operations are performed, the rate selection command is sent to the optical port to prepare for rate adaptation. In this embodiment, the first rate selection starts from 1228.8 Mbit/s. After the optical interface receives the rate selection command, the optical interface is configured as required by the command. After the configuration is complete, the configuration result is reported and the negotiation pulse from the peer is started. According to the configuration result, if the rate configuration is successful, a command for generating a negotiation pulse is sent, a negotiation pulse is generated according to the currently selected rate, and the generated negotiation pulse is sent to the optical port, and is sent to the optical port. The peer end (the RRU needs to lock the clock from the BBU and sends it). If the optical port only supports 2457.6 Mbit/s, but the optical port is configured to send the negotiation pulse at 1228.8 Mbit/s, in fact, the optical path in this case There is no optical signal transmission that can be recognized by the peer.

According to the negotiation pulse format shown in Figure 1, the negotiation pulse includes: check field, service rate, service type, service version, device model, link status, protocol version, and the timer is turned on at the same time, and the sending time continues to be appropriate. At the RRU end, this time guarantees that the RRU side parallel/serial-to-serial converter (serdes) can lock the link clock from the BBU and can send enough negotiation pulses. If it is a cascaded RRU (the lower RRU end needs to lock the time negotiation pulse from the upper RRU. At the same time as the negotiation pulse step is sent, the negotiation pulse of the opposite end is received and parsed, and when the time is up, the received and parsed will be received. Device information record, of course, the local end sends the negotiation pulse and the local end receives the negotiation pulse. It may not be the same at the same time. However, according to the time of receiving the handshake optical signal, the opposite end sends the negotiation pulse and the local end receives the negotiation pulse to leave a window large enough in time. The size of the window ensures that there is enough time at both ends to send and receive negotiation pulses at the same rate. The windows at both ends do not require strict time alignment. Determine whether to initiate the rate selection configuration and negotiate the pulse transmission process according to the analysis result. If the rate negotiation succeeds, the data can be parsed correctly. Then, the optical port is reconfigured according to the negotiated rate. Otherwise, the next rate is 2457.6 Mbit/s. In this embodiment, the rate specification is selected from small to large. The result of the analysis has not been successful in rate negotiation. Then, it is repeated until the maximum rate of the system or the CPRI protocol is reached, so that the negotiation is performed at each rate. Of course, the negotiation can be performed from the large to the small. If the rate selection and the configuration reach the maximum rate, the OISN value is checked. If it is still zero, the auto-negotiation process is stopped, and the negotiation unsuccessful state is retained. If the OISN value is non-zero, the step of returning the optical status signal of the monitoring optical port, so three times, still fails to stop the auto-negotiation process, retaining the current state.

The scheme in the embodiment of the present invention is specifically described below with reference to FIG. 2. First, it is assumed that the BBU model is A, and the RRUs of the models A1 and A2 can be accessed, and the highest speed supported by the A1. The rate is 2457.6 Mbit/s, and the maximum rate supported by A2 is 4915.2 Mbit/s. The assumed RRU is A2, the minimum optical port rate of A2 is 2457.6 Mbit/s, and the minimum BBU rate is 2457.6 Mbit/s. As shown in Figure 2, the BBU is used as an example to describe the specific implementation process:

Step 10: The BBU is in the optical port monitoring state detection OIS state.

During the optical port monitoring process, the BBU and the RRU power on and access the optical fiber, or replace the RRU and access the optical fiber, or replace the optical interface and access the optical fiber. The optical signal will be lost to the recovery state. OISN = 1 will be detected.

Step 20: Determine whether OISN is 0. If it is 0, go to step 10. Otherwise, go to step 30.

In step 30, the OISN value is cleared.

In step 40, the optical power is turned off and the operation is turned on, and the first handshake optical signal is sent to the RRU. Step 50: Monitor whether the value of the OISN is 1 and open the timer. If yes, go to step 80. Otherwise, go to step 60.

By monitoring whether the value of the OISN is 1 and turning on the timer, it is to ensure that the first handshake optical signal of the RRU is received within a predetermined time.

In step 60, it is determined whether the timeout is 1 second. If yes, step 70 is performed, otherwise step 80 is performed. In this embodiment, if the timeout is 1 second, it is considered that the first handshake handshake signal is not received by the RRU. Of course, depending on the actual needs, the timeout period can be different, such as a timeout of 0.5 seconds or 2 seconds.

Step 70: Set OISN to 0, and return to step 10 for optical port monitoring.

Step 80: After receiving the first optical signal handshake of the RRU, perform optical power shutdown and open operation, and start transmitting the second handshake optical signal.

Similar to the foregoing, by monitoring the value of the OISN, it is determined whether the first handshake optical signal sent by the RRU is received. If the value of the OISN is equal to 1, it indicates that the first handshake optical signal sent by the RRU is received.

Step 90: Monitor the value of the OISN, determine whether the OISN is equal to 2, and open the timer. If yes, go to step 120. Otherwise, go to step 100. Step 100, determining whether the timeout is 1 second, if yes, executing step 70, otherwise performing the step

110.

If the OISN is equal to 2, it indicates that the second handshake optical signal sent by the RRU is received, and the handshake is successful.

Step 110: Start the rate configuration, start configuration from 1228.8 Mbit/s, and send the negotiation burst according to the configured rate to open the timer.

After the RRU sends the second handshake optical signal, it will send a negotiation burst with a rate of 1228.8 Mbit/s to the BBU according to a prior strategy, such as the next 2 seconds. The BBU also according to the time of receiving the handshake optical signal, after the next 2 The negotiation burst is received at a rate of 1228.8 Mbit/s in seconds, so that the time and rate at which the transmitting end RRU sends the negotiation burst is ensured, which is the same as the time and rate at which the receiving BBU receives the negotiation burst, in this embodiment, from the CPRI protocol. Supported 1228.8Mbit/s, 2457.6Mbit/s, 3072Mbit/s, 4915.6Mbit/s, 6144Mbit/s multiple speeds, from low to high.

In step 120, it is determined whether the negotiation burst is correctly parsed. If yes, step 130 is performed; otherwise, step 170 is performed.

The optical interface of the RRU locks the link clock and sends the negotiation burst according to the configured rate. In this case, the timer does not time out. The timer timeout period is set to 1 second. After the BBU receives the packet, the negotiation burst is parsed. The information includes not only the optical port rate of the RRU, but also other device information required for the RRU to establish a high-level connection, and can determine whether it is in an auto-negotiation state according to the link status.

In this embodiment, it can be determined whether the parsing is correct by the check field included in the negotiation burst in FIG. 2. Since the minimum optical port rate of both ends is 2457.6 Mbit/s, the negotiation burst will not be correctly parsed after the first rate configuration. When this timeout occurs, the second rate configuration and negotiation burst transmission are started, and the rate configured at both ends is 2457.6 Mbit/s. When the rate is set to 2457.6 Mbit/s, both ends of the RRU and the BBU receive the negotiation burst sent by the peer and parse it correctly. Step 130: Record the device information obtained by the parsing, and perform matching processing according to the parsed device information.

The analysis result in this step is correct. The device information is: 4915.6 Mbit/s, the service type is LTE, the service version is V1.0, the model number is A2, and the protocol version is V4.1. The BBU matches the device information of the RRU carried by the negotiation pulse according to the device information of the RRU that can be connected in advance. The above device information is device information required for establishing a high-level connection.

Step 140: Determine whether the matching is correct. If step 150 is performed, otherwise step 160 is performed. Step 150: Report the background RRU device information.

Step 160: Configure an optical port rate according to the service rate in the device information.

As the result of the auto-negotiation is correct, the device information is matched according to the device information obtained by the parsing. The RRU and the BBU will communicate with the optical port at the configured optical port rate of 4915.6 Mbit/s.

Step 170, determining whether the timeout is 1 second, if yes, executing step 180, otherwise performing the step

130.

Step 180: Determine whether the rate configuration is equal to 6144 Mbit/s. If yes, go to step 200. Otherwise, go to step 190.

Step 190, increasing the rate configuration and transmitting the negotiation burst.

In step 200, it is determined that the rate negotiation fails and the negotiation failure count is performed.

Step 210: Determine whether the number of negotiation failures is greater than 3. If yes, execute step 220. Otherwise, go to step 70.

Step 220, set OISN to 1, and repeat step 10.

Assume that the accessed RRU is A2 and the RRU device information matches. According to the result of the matching, the rate of the final link communication is 4.9152 Gbit/s, and the physical link auto-negotiation process is completed. If the result of the negotiation is not matched, the RRU device information accessed in the background can be reported. For example, if the RRU model is connected incorrectly, the device information of the RRU can also be negotiated in the highest and lowest rate ranges. The result of the judgment is that it does not match. If the rate is set to the highest, the negotiation cannot be successful. If the negotiation fails successfully for three consecutive times, the status of the negotiation failure is recorded and the status of the optical port monitoring is returned. For example, if the optical port of one end is damaged, or the range of optical port rates at both ends does not overlap, the negotiation cannot be successful.

Of course, the use of the negotiation pulse in this embodiment is only a preferred embodiment of the present embodiment, so that the process of synchronizing with the CPRI frame is better, and the CPRI frame can be used instead of the negotiation pulse.

The embodiment of the invention further provides a device for auto-negotiation of optical port rate. As shown in FIG. 3, the device includes:

The handshake optical signal receiving module 310 is configured to receive the handshake optical signal sent by the sending end, and the selecting module 320 is configured to select the optical port rate from the multiple rates according to a predetermined policy. The data receiving module 330 is configured to receive the handshake optical signal according to the received signal. Time, when the transmitting end sends the handshake optical signal and then sends the data, the data is received at the selected rate, and the rate at which the transmitting end sends the data is selected from the multiple rates according to the predetermined policy, and the rate at which the transmitting end sends the data and the receiving end Receive data at the same rate;

The state control module 340 is configured to parse the received data. If the data is successfully parsed, the rate auto-negotiation is successful. Otherwise, the rate auto-negotiation is unsuccessful.

Further, the handshake optical signal receiving module 310 is further configured to receive the handshake optical signal sent by the transmitting end, and turn off the optical power and turn on the signal as a handshake optical signal.

Further, the handshake optical signal receiving module 310 is further configured to receive the number of times that the optical power sent by the transmitting end is turned off and the signal is turned on twice;

The selecting module 320 is further configured to: according to the time of receiving the second handshake optical signal, send data according to the selected rate and send data while transmitting the handshake optical signal at the transmitting end.

Further, the data receiving module 330 is further configured to: according to the time of receiving the handshake optical signal, send the handshake pulse signal after the transmitting end sends the negotiation burst, and at the same time, negotiate the burst reception, and the sender sends the negotiation burst. The rate is the same as the configured rate, negotiating the pulse The number includes the device information needed to establish a high-level connection.

Further, the state control module 340 is further configured to perform matching processing on device information required for establishing a high-level connection. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Claim

A method for auto-negotiation of an optical port rate, comprising:

Receiving a handshake optical signal sent by the transmitting end;

Selecting an optical port rate from a plurality of rates according to a predetermined policy;

According to the time of receiving the handshake optical signal, the data is received at the selected optical port rate while the transmitting end sends the handshake optical signal, and the rate at which the transmitting end sends the data is selected from the multiple rates according to the predetermined policy, and is sent. The rate at which the data is sent is the same as the rate at which the receiver receives the data;

2. The method according to claim 1, wherein the receiving hand optical signal sent by the transmitting end is: receiving a handshake optical signal sent by the transmitting end, turning off the optical power and turning on the signal as the handshake optical signal.

The method of claim 2, wherein the receiving light signal sent by the receiving end is:

The number of times the optical power transmitted by the receiving end is turned off and the signal is turned on twice;

According to the time of receiving the handshake optical signal, while the transmitting end sends the handshake optical signal and then sends the data, the data reception at the selected rate is specifically as follows:

According to the time of receiving the second handshake optical signal, the data is received at the selected rate while the data is transmitted after the handshake signal is sent by the transmitting end.

The method according to claim 1, wherein, according to the time of receiving the handshake optical signal, the data is received at the selected rate and the data is sent by the transmitting end while the transmitting end sends the handshake optical signal and then transmits the data. The rate is the same as the configured rate:

According to the time of receiving the handshake optical signal, after the handshake signal is sent by the transmitting end, the negotiation burst is sent, the negotiation burst is received at the selected rate, and the transmitting end sends the negotiation burst. The rate is the same as the configured rate, and the negotiation pulse signal includes the device information needed to establish a high-level connection.

The method according to claim 4, wherein, after the rate auto-negotiation is successful, the method further comprises: performing matching processing on device information required for establishing a high-level connection.

6. A device for auto-negotiation of optical port rate, characterized in that:

The device according to claim 6, wherein the handshake optical signal receiving module is further configured to receive a handshake optical signal sent by the transmitting end, and turn off the optical power and turn on the signal as a handshake optical signal.

The device of claim 7, wherein the handshake optical signal receiving module is further configured to receive the number of times that the optical power sent by the transmitting end is turned off and the signal is turned on twice;

The selection module is further configured to perform data reception at a selected rate while transmitting data by transmitting a handshake optical signal according to a time when the second handshake optical signal is received.

The device according to claim 6, wherein the data receiving module is further configured to: according to the time of receiving the handshake optical signal, send the handshake optical signal after the transmitting end sends the negotiation burst, and at the selected rate Negotiation burst reception, the rate at which the transmitting end sends the negotiation burst is the same as the configured rate, and the negotiation pulse signal includes the device information required for establishing a high-level connection.

The device according to claim 9, wherein the state control module is further configured to perform matching processing on device information required for establishing a high-level connection.