CN104955089A - Wireless access network, signal sending method and signal receiving method - Google Patents

Abstract

The embodiment of the invention provides a wireless access network, a signal sending method and a signal receiving method. When any one RRU in multiple RRUs is failed, according to a BBU, for a downlink, the downlink optical signal of a modulated downlink signal is respectively sent to adjacent RRUs. All RRUs as failed RRU subordinate equipment between the failed RRU and the BBU when a ring is not failed to transmit a downlink optical signal along the direction opposite to direction of downlink optical signal transmission when the ring is not failed. For an uplink, all RRUs as failed RRU superior equipment between the failed RRU and the BBU when the ring is not failed to transmit an uplink optical signal along the direction opposite to direction of uplink optical signal transmission when the ring is not failed. A plurality of RRUs are used for transmitting the optical signal according to indication when the indication of the BBU is received. Otherwise, the optical signal is transmitted along the direction of transmitting the optical signal when a ring is not failed. The link protection is realized. The invention relates to the field of wireless communication.

Description

A wireless access network, signal sending method and receiving method

technical field

The invention relates to the technical field of mobile communication, in particular to a wireless access network, a signal sending method and a receiving method.

Background technique

With the development of the mobile Internet, the future mobile communication is gradually developing in the direction of "mobile broadband, broadband mobility". User business needs are increasing, which requires high-quality, high-capacity network coverage, so the number of base stations needs to be increased. Increasing the number of base stations will not only consume more manpower and material resources, but also consume more resources.

Therefore, Centralized Radio Access Network (C-RAN, Centralized Radio Access Network), a new type of wireless access network architecture, came into being. C-RAN is a green wireless network based on centralized processing, cooperative radio and real-time cloud computing architecture. Access network architecture. The C-RAN network usually includes a baseband unit (BBU, Baseband Unit) based on a centralized baseband processing pool, as well as a remote radio frequency unit (RRU, Remote Radio Unit) and antennas. The connection mode between the BBU and the RRU may be a star structure or a ring structure.

In the prior art, the C-RAN with a ring structure includes a BBU and multiple RRUs connected in series to form a ring. For the downlink, in this ring, the downlink optical signal is sent by the BBU and moves clockwise or counterclockwise along the ring. One-way transmission, each device in the downlink receives the downlink optical signal sent by its own upper-level device in the link, and transmits the downlink optical signal to its own lower-level device in the link; for the uplink Link, in this ring, the uplink optical signal is sent by the RRU, and is transmitted clockwise or counterclockwise along the ring, and each device in the uplink receives the signal sent by its own upper-level device in the link Uplink optical signal, and transmit uplink optical signal to its own next-level equipment in the link.

Then, when a certain RRU in the ring fails, whether it is the transmission link of the uplink optical signal or the transmission link of the downlink optical signal, the faulty RRU cannot send the optical signal sent by the upper-level equipment in the link where it is located to the local The next-level equipment in the link causes the ring to be disconnected, making C-RAN unable to work normally.

Contents of the invention

The embodiment of the present invention provides a wireless access network, a signal sending method and a receiving method, which are used to solve the problem that the C-RAN cannot work normally when any RRU in the C-RAN based on the ring structure fails in the prior art .

An embodiment of the present invention provides a wireless access network, including: a BBU and multiple RRUs, and the one BBU and multiple RRUs are connected in series through optical fibers to form a ring; when any one of the multiple RRUs fails , including:

The BBU is configured to send the downlink optical signal modulated with the downlink signal to two RRUs adjacent to the BBU for the downlink; and indicate between the faulty RRU and the BBU, when the ring is not faulty All RRUs serving as subordinate devices of the faulty RRU transmit downlink optical signals in a direction opposite to the direction in which the downlink optical signals are transmitted when the ring is not faulty;

For the uplink, instruct all RRUs between the faulty RRU and the BBU, which are the superior equipment of the faulty RRU when the ring is not faulty, to transmit uplink optical signals in the direction opposite to the direction when the ring is not faulty transmit uplink optical signal;

The plurality of RRUs are configured to transmit optical signals according to the indication when receiving the indication from the BBU; when not receiving the indication from the BBU, transmit the optical signal in the direction in which the ring is not faulty light signal.

An embodiment of the present invention provides a signal sending method, including:

When any RRU in the multiple RRUs of the radio access network fails, the BBU sends the optical signal modulated with the downlink signal to two RRUs adjacent to the BBU, wherein the multiple RRUs are connected to the The BBUs are connected in series through optical fibers to form a wireless access network; and

Instructing all RRUs between the faulty RRU and the BBU, and when the ring is not faulty, to be subordinate to the faulty RRU, to transmit downlink optical signals in a direction opposite to the direction in which the downlink optical signals are transmitted when the ring is not faulty;

For each RRU, when receiving the instruction sent by the BBU, transmit the downlink optical signal according to the received instruction;

Otherwise, the downlink optical signal is transmitted according to the direction in which the downlink optical signal is transmitted when the ring is not faulty.

An embodiment of the present invention provides a signal receiving method, including:

When any RRU in the multiple RRUs of the radio access network fails, the BBU instructs all RRUs between the faulty RRU and the BBU, and when the ring is not faulty, to be the superior device of the faulty RRU, along with the ring When there is no failure, the upstream optical signal is transmitted in the opposite direction to the upstream optical signal,

Wherein, the plurality of RRUs and the BBU are connected in series through optical fibers to form a wireless access network;

For each RRU, when receiving the instruction sent by the BBU, transmit the uplink optical signal according to the received instruction,

Otherwise, the uplink optical signal is transmitted according to the direction in which the uplink optical signal is transmitted when the ring is not faulty.

The beneficial effects of the embodiments of the present invention include:

A wireless access network, a signal sending method, and a receiving method provided by an embodiment of the present invention provide a wireless access network, including a BBU and multiple RRUs, and the one BBU and multiple RRUs are connected in series through an optical fiber to form a ring , when any one of the multiple RRUs fails, the BBU is used to send the downlink optical signal modulated with the downlink signal to its adjacent RRUs for the downlink; When a fault occurs, all RRUs that are subordinate to the faulty RRU transmit downlink optical signals in the direction opposite to the direction in which the downlink optical signal is transmitted when the ring is not faulty; for the uplink, indicate between the faulty RRU and the BBU, and when the ring is not faulty, they are used as faulty RRUs All RRUs of the upper-level equipment transmit uplink optical signals in the direction opposite to the direction of transmitting uplink optical signals when the ring is not faulty; multiple RRUs are used to transmit optical signals according to the instructions when receiving instructions from the BBU; when the BBU is not received When indicated by , the optical signal is transmitted in the direction that the optical signal was transmitted when the ring was not faulty. In the wireless access network proposed by the embodiment of the present invention, when any RRU fails, for the downlink, the two RRUs adjacent to the BBU are used as the transmission starting point, and the downlink is transmitted in two directions close to the faulty RRU in the ring. Optical signals, for the uplink, start from two RRUs adjacent to the faulty RRU, and transmit downlink optical signals in two directions away from the faulty RRU in the ring, that is, when any RRU in the ring fails At this time, the normal data transmission of the ring C-RAN network is guaranteed by bidirectional transmission of optical signals, and link protection is realized.

Description of drawings

FIG. 1 is a schematic structural diagram of a wireless access network provided by an embodiment of the present invention;

FIG. 2 is a flowchart of a signal sending method provided by an embodiment of the present invention;

FIG. 3 is a flowchart of a signal receiving method provided by an embodiment of the present invention;

4a-4b are schematic diagrams of wireless access network signal transmission provided in Example 1 of the embodiment of the present invention;

5a-5e are schematic diagrams of the signal structure of the wireless access network provided in Example 2 of the embodiment of the present invention;

FIG. 6 is a flowchart of a signal sending method provided by Embodiment 3 of the present invention;

FIG. 7 is a flow chart of a signal receiving method provided by Embodiment 4 of the present invention.

Detailed ways

The embodiment of the present invention provides a wireless access network, a signal sending method, and a receiving method. The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only for illustration and explanation The present invention is not intended to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

An embodiment of the present invention provides a wireless access network, as shown in FIG. 1 , including: a BBU101 and multiple RRU102, and the one BBU101 and multiple RRU102 are connected in series through an optical fiber to form a ring. When any one of the multiple RRU102 RRU102 When a failure occurs,

The BBU101 is used to send the downlink optical signal modulated with the downlink signal to the two RRU102 adjacent to the BBU101 for the downlink; and indicate the connection between the faulty RRU102 and the BBU101, when the ring is not faulty, as the subordinate device of the faulty RRU102 All RRUs 102 transmit downlink optical signals in the direction opposite to the direction in which the downlink optical signals are transmitted when the ring is not faulty;

For the uplink, instruct all the RRU102 between the faulty RRU102 and the BBU101 and as the upper-level device of the faulty RRU102 when the ring is not faulty, to transmit the uplink optical signal in the direction opposite to the direction of the uplink optical signal when the ring is not faulty;

The multiple RRUs 102 are configured to transmit optical signals according to the instructions when receiving instructions from the BBU 101 ; when not receiving instructions from the BBU 101 , transmit optical signals according to the direction in which the optical signals are transmitted when the ring is not faulty.

Further, in the above-mentioned ring radio access network composed of BBU101 and RRU102 provided by the embodiment of the present invention, signals can be transmitted clockwise or counterclockwise. Then, for the BBU101 and each RRU102, the device that is adjacent to the device and sends an optical signal to the device can be used as the upper-level device of the device, and the upper-level device of the device and the upper-level device can be connected to the The initiating device that sends the optical signal is regarded as all the upper-level devices of the device, the device adjacent to the device that sends the optical signal is the lower-level device of the device, the lower-level device of the device and the lower-level device The device to the terminating device that sends the optical signal acts as all subordinate devices of the device.

Specifically, for the downlink, if the BBU 101 sends a signal to the RRU 102 with the ID 1 adjacent to itself, then the signal transmission direction of the downlink is clockwise. The RRU102 with 3 sends a signal, then the signal transmission direction of the downlink is counterclockwise; for the uplink, if the RRU102 marked as 1 sends a signal to the RRU102 marked as 2 adjacent to itself, then the uplink The signal transmission direction of the link is clockwise. Correspondingly, if the RRU 102 marked with 3 sends a signal to the RRU 102 adjacent to itself, then the signal transmission direction of the uplink is counterclockwise.

Further, in the transmission direction of the downlink signal in the above-mentioned ring, it is assumed that the first device is adjacent to the second device and the third device respectively, and the first device receives a signal from the second device, and the first device sends a signal to the third device To send a signal, then, the second device can be used as the upper-level device of the first device in the downlink, and the third device can be used as the lower-level device of the first device in the downlink, and the second device and the first device can be used The devices are all used as the superior device of the third device in the downlink, and the first device and the third device are regarded as the subordinate devices of the second device in the downlink; similarly, in the uplink signal transmission direction of the above ring, it is assumed that The first device receives a signal from the second device, and the first device sends a signal to the third device, then the second device can be used as the upper-level device of the first device in the uplink, and the third device can be used as the uplink The second device and the first device can both be used as the upper-level device of the third device in the uplink, and the first device and the third device can be used as the lower-level device of the second device in the uplink equipment.

Based on the wireless access network shown in FIG. 1 above, an embodiment of the present invention also provides a signal sending method, as shown in FIG. 2 , including:

S201. When any one of the multiple RRUs in the wireless access network fails, the BBU sends the optical signal modulated with the downlink signal to two RRUs adjacent to the BBU, wherein the multiple RRUs are connected in series with the BBU through an optical fiber A loop forms a wireless access network.

S202. Instruct the RRU between the faulty RRU and the BBU, and when the ring is not faulty, as the subordinate device of the faulty RRU, to transmit the downlink optical signal in a direction opposite to the direction in which the downlink optical signal is transmitted when the ring is not faulty.

S203. For each RRU, when receiving the instruction sent by the BBU, transmit the downlink optical signal according to the received instruction.

S204. Otherwise, transmit the downlink optical signal according to the direction in which the downlink optical signal is transmitted when the ring is not faulty.

Based on the wireless access network shown in FIG. 1 above, an embodiment of the present invention also provides a signal receiving method, as shown in FIG. 3 , including:

S301. When any RRU in the multiple RRUs of the radio access network fails, the BBU instructs all RRUs between the faulty RRU and the BBU and as the superior device of the faulty RRU when the ring is not faulty, to transmit uplink light along the ring and when the ring is not faulty. Uplink optical signals are transmitted in the direction opposite to the signal direction, wherein multiple RRUs and BBUs are connected in series through optical fibers to form a ring to form a wireless access network.

S302. For each RRU, when receiving the instruction sent by the BBU, transmit the uplink optical signal according to the received instruction.

S303. Otherwise, transmit the uplink optical signal according to the direction in which the uplink optical signal is transmitted when the ring is not faulty.

The method and related equipment provided by the present invention will be described in detail below with specific embodiments in conjunction with the accompanying drawings.

Example 1:

In Embodiment 1 of the present invention, a wireless access network is provided, as shown in FIG. 1 , including: a BBU101 and multiple RRU102, and the one BBU101 and multiple RRU102 are connected in series through optical fibers to form a ring;

When the ring is not faulty, it works as follows:

For the downlink 103, the BBU 101 can be used to use optical carriers of different wavelengths corresponding to multiple RRUs 102 to modulate the downlink signals that need to be sent through multiple RRUs 102 to optical carriers of different wavelengths, and the generated modulation After the optical signal is multiplexed, it is sent to the next-level RRU102 of the BBU101 in the ring through an optical fiber;

Each RRU102 in the multiple RRU102 except the upper-level RRU102 of the BBU101 can be used to receive the optical signal sent by the upper-level device of the RRU102 in the ring; send a part of the optical signal to the ring. The next-level equipment of the RRU102 separates and demodulates the optical signal corresponding to the wavelength of the RRU102 in another part of the optical signal, and then sends the obtained downlink signal that needs to be sent by the RRU102;

The upper-level RRU102 of the BBU101 can be used to receive the optical signal sent by the upper-level device of the RRU102 in the ring; separate and demodulate the optical signal corresponding to the wavelength of the RRU102 in the optical signal from the optical signal, and obtain the required The downlink signal sent by the RRU102 is sent;

For the uplink 104, the BBU101 can be used to demodulate the modulated optical signal when receiving the modulated optical signal of multiple RRU102 sent by the upper-level RRU102 of the BBU101 in the ring, and obtain the transmitted signal of multiple RRU102. Uplink signal to BBU101;

Each RRU102 in the plurality of RRU102 can be used to modulate the received uplink signal to an optical carrier with a wavelength corresponding to the RRU102 to obtain a modulated optical signal; when receiving the optical signal sent by the upper-level device of the RRU102 signal, couple the received optical signal with the modulated optical signal, and send the coupled optical signal to the next-level equipment of the RRU102; otherwise, send the modulated optical signal to the next-level equipment of the RRU102, Wherein, the above-mentioned device is RRU102 or BBU101.

Further, for the downlink 103, each RRU102 in the multiple RRU102 can also be used to receive the optical signal sent by the upper-level equipment of the RRU102 in the ring; send a part of the optical signal to the ring The next-level equipment of the RRU 102 separates and demodulates the optical signal corresponding to the wavelength of the RRU 102 in another part of the optical signal, and sends the obtained downlink signal that needs to be sent by the RRU 102 .

Further, in the radio access network provided by the embodiment of the present invention, for the downlink 103, the upper-level RRU 102 of the BBU 101 may, after receiving the optical signal sent by the upper-level device of the upper-level RRU 102 , In the optical signal, the optical signal corresponding to the wavelength of the upper-level RRU102 is separated and demodulated, and the obtained downlink signal is sent. Instead of sending the optical signal to the BBU101, it can also be sent to the upper-level device that receives the upper-level RRU102 After receiving the optical signal, perform the same processing as the RRU102 other than the upper-level RRU102, that is, send a part of the received optical signal to the BBU101, and send the other part of the optical signal to the wavelength corresponding to the upper-level RRU102 In the downlink, BBU101 and its own upstream The link between the first-level RRUs 102 may not be used to transmit downlink data, but to transmit control information, such as fault information.

For the uplink 104, the lower-level RRU 102 of the BBU 101 may not receive the optical signal sent by the BBU 101, but directly modulates the uplink signal received by itself to the optical carrier of the wavelength corresponding to the lower-level RRU 102, and the modulated optical signal, and send the modulated optical signal to the next-level device of the next-level RRU102.

Further, when any RRU 102 among the plurality of RRUs 102 fails, the BBU 101 is used to send the downlink optical signal modulated with the downlink signal to the two adjacent RRUs 102 of the BBU 101 for the downlink 103; and indicate the failure Between the RRU102 and the BBU101, when the ring is not faulty, all the RRU102s that are subordinate to the faulty RRU102 transmit the downlink optical signal in the direction opposite to the direction in which the downlink optical signal is transmitted when the ring is not faulty;

For the uplink 104, instruct all the RRU102 between the faulty RRU102 and the BBU101, which is the upper-level device of the faulty RRU102 when the ring is not faulty, to transmit the uplink optical signal in the direction opposite to the direction in which the uplink optical signal is transmitted when the ring is not faulty;

The multiple RRUs 102 are configured to transmit optical signals according to the instructions when receiving instructions from the BBU 101 ; when not receiving instructions from the BBU 101 , transmit optical signals according to the direction in which the optical signals are transmitted when the ring is not faulty.

Further, for the downlink 103, when any one of the multiple RRUs 102 fails, the BBU 101 multiplexes the generated modulated optical signals and sends them to the upper-level RRU 102 and the lower-level RRU 102 of the BBU 101 respectively; And send instructions to the upper-level RRU 102 of the BBU 101 when no fault occurs in the ring, and each RRU 102 between the upper-level RRU 102 and the faulty RRU 102;

Each RRU102, when receiving the instruction sent by the BBU101, according to the instruction, the lower-level device of the RRU102 when the ring is not faulty is the upper-level device of the RRU102, and the upper-level device of the RRU102 is the RRU102. Lower-level equipment; when any RRU102 fails, the downlink optical signal starts from the upper-level RRU102 and the lower-level RRU102 of the BBU101, and transmits the downlink optical signal to two directions close to the faulty RRU102;

For the uplink 104, the BBU 101 sends an indication to the lower-level RRU 102 of the BBU 101 when no failure occurs, and to each RRU 102 between the lower-level RRU 102 and the faulty RRU 102;

Each RRU102, when receiving the instruction sent by the BBU101, when the ring does not fail, the lower-level device of the RRU102 is the upper-level device of the RRU102, and the upper-level device of the RRU102 is the lower-level device of the RRU102 equipment. When any RRU 102 fails, the upstream optical signal starts from the upstream RRU 102 and the downstream RRU 102 of the faulty RRU 102 , and transmits the upstream optical signal in two directions away from the faulty RRU 102 . The following example illustrates:

Example 1: It is assumed that the radio access network includes a BBU401, and RRU402 to RRU407, and the BBU401, RRU402 to RRU407 are connected in series through an optical fiber to form a ring. Figures 4a-4b are schematic diagrams of wireless access network signal transmission provided in Example 1 of the embodiment of the present invention, Figure 4a is a schematic diagram of signal transmission when none of the devices in the wireless access network fail, and Figure 4b is a schematic diagram of a certain wireless access network in the wireless access network Schematic diagram of signal transmission when a device fails.

As shown in Fig. 4a, it is assumed that both downlink 408 and uplink 409 in the radio access network transmit signals in a clockwise direction. For the downlink 408, BBU401 can use the optical carriers of different wavelengths (λ1 to λ6) corresponding to the six RRUs from RRU402 to RRU407 to modulate the downlink signals that need to be sent by RRU402 to RRU407 to λ1 to λ6 respectively, and generate After the modulated optical signal is multiplexed, it is sent to the next-level equipment of BBU401 through optical fiber, that is, the equipment RRU402 adjacent to BBU401 in the optical signal transmission direction, RRU402 receives the optical signal sent by its own upper-level equipment BBU401, Send a part of the optical signal to its own next-level device RRU403 in the ring, and separate and demodulate the optical signal corresponding to the wavelength λ1 of the RRU402 from the other part of the optical signal to obtain the signal that needs to be sent by the RRU402 Downlink signal and send it; similarly, when RRU403 receives the optical signal sent by its upper-level equipment RRU402, it sends a part of the optical signal in the optical signal to its own next-level equipment RRU404 in the ring, and sends the other part of the optical signal The optical signal corresponding to the wavelength λ2 of the RRU 403 is separated from the other part of the optical signal and demodulated to obtain the downlink signal that needs to be sent by the RRU 403 and send it; and so on.

Further, in the downlink, the RRU is used to send the downlink signal sent by the BBU to the RRU. For the BBU401 and its upper-level equipment RRU407, when all the RRUs in the ring are working normally, the RRU407 may not transmit optical signals to the BBU401, That is, when RRU407 receives the optical signal sent by its upper-level device RRU406, it may not send a part of the optical signal in the optical signal to its own lower-level device BBU401 in the ring, but combine the received optical signal with RRU407 The optical signal corresponding to the wavelength λ6 is separated from the optical signal and demodulated to obtain the downlink signal that needs to be sent by the RRU 407 and send it. It may also send a part of the received optical signals to the BBU401 like other RRUs in the ring, and the BBU401 may not process the received optical signals sent to the RRU407. The specific implementation manner may be determined according to actual needs.

Further, assuming that the downlink 408 in the radio access network transmits signals counterclockwise, then the lower-level device of the BBU401 is the RRU407, the upper-level device of the BBU401 is the RRU402, and so on.

For the uplink 409, the RRU402 can modulate the received uplink signal to an optical carrier with a wavelength λ1 corresponding to the RRU402, and send the modulated optical signal to the next-level device RRU403 of the RRU402, and the RRU403 modulates the received uplink signal to the optical carrier of the wavelength λ2 corresponding to RRU403, and receive the optical signal sent by RRU402, couple the received optical signal with the modulated optical signal, and send the coupled optical signal to RRU404, the next-level device of RRU403, so as to analogy.

Furthermore, if a certain RRU in the ring does not receive the uplink signal, nor does it receive the optical signal sent by the upper-level equipment of the RRU, then the RRU may not send an optical signal to the lower-level equipment of the RRU, then the The next-level RRU modulates the uplink signal received by itself and sends it to its own next-level RRU.

As shown in Figure 4b, assuming that the RRU404 fails, for the downlink 408, the BBU401 multiplexes the generated modulated optical signal and sends it to the upper-level RRU407 and the lower-level RRU402 of the BBU401, and sends the signal to the upper-level RRU407 and the lower-level RRU402 of the BBU in the ring. The first-level equipment RRU407, and the RRU405 and RRU406 between RRU407 and RRU404 send instructions; when the RRU407 according to the instructions, when no failure occurs, the lower-level equipment BBU401 of the RRU407 is used as the upper-level equipment, and the upper-level equipment RRU406 of the RRU407 is used as the upper-level equipment. As a lower-level device; when RRU406 receives the instruction, the RRU407, the lower-level device of RRU406 when no failure occurs, is used as the upper-level device, and the upper-level device RRU405 of RRU406 is used as the lower-level device; when RRU405 receives After this instruction, the RRU406, the lower-level equipment of the RRU405 when no failure occurs, is used as the upper-level equipment, and the upper-level equipment RRU404 of the RRU405 is used as the lower-level equipment, and the optical signal modulated with the downlink signal can be sent to the RRU404. The optical signal modulated with the downlink signal is not sent to RRU404.

For the uplink 409, the BBU 401 is also used to send instructions to the next-level RRU 402 of the BBU 401 and the RRU 403 between the RRU 402 and the RRU 404 when no failure occurs; direction, to send an optical signal to RRU402, the next-level device of RRU403; when RRU405 receives the instruction, it sends an optical signal to RRU406, the next-level device of RRU405, along the direction away from RRU404 in the ring, that is, clockwise; when RRU402 receives When indicating, when there is no fault in the ring, the lower-level equipment RRU403 of RRU402 is used as the upper-level equipment of RRU402, and the upper-level equipment BBU401 of RRU402 is used as the lower-level equipment of RRU402; When a fault occurs, RRU404, the lower-level device of RRU403, acts as the upper-level device of RRU403, and RRU402, the upper-level device of RRU403, acts as the lower-level device of RRU403.

That is to say, for downlink 408, BBU401, RRU407, RRU406, and RRU405, after RRU404 fails, the optical signal transmission direction is opposite to that when no failure occurs. After the failure, the optical signal transmission direction is opposite to that when no failure occurs. When the RRU404 does not fail, the downlink 408 and the uplink 409 are all unidirectional transmissions, but after the RRU404 fails, the downlink 408 and the uplink Road 409 adopts two-way transmission, and isolates the faulty device RRU404 from the link, so that the non-faulty device will not be unable to complete the signal transmission because of the faulty device. The wireless access provided by the embodiment of the present invention Network, not only realizes the ring network architecture, but also ensures the normal operation of RRUs other than the faulty RRU through clockwise and counterclockwise bidirectional transmission along the ring when a certain RRU fails, and realizes link protection.

Example 2:

The wireless access network provided in Embodiment 2 of the present invention is a specific implementation of the wireless access network proposed in Embodiment 1 of the present invention, as shown in FIG. 5a:

The BBU101 includes: a data sending unit, an optical modulator, a laser, a data receiving unit, and an optical demodulator; each of the RRU102 includes: a first downlink circulator 501, a second downlink circulator 502, a first power splitter, optical splitter, optical demodulator, transmitter, first uplink looper 503, second uplink looper 504, first optical coupler, optical external modulator, receiver;

Wherein, for the downlink 103, in the BBU101, the data sending unit and the laser are respectively connected to the optical modulator; in each RRU102, the first interface of the first downlink circulator 501 and the second downlink circulator 502 The first interface of the first power divider is respectively connected with the first power splitter, and the first power splitter, the optical splitter, the optical demodulator, and the transmitter are connected in sequence; The second interface of the second downlink circulator 502 of the first-level RRU102 is connected; between the BBU101 and the next-level RRU102 of the BBU101, the BBU101 is connected with the second interface of the first downlink circulator 501 of the next-level RRU102 ; Between two adjacent RRUs 102, the second interface of the second downlink circulator 502 of the RRU 102 of the upper level is connected to the second interface of the first downlink circulator 501 of the RRU 102 of the lower level;

For the uplink 104, in the BBU101, the data receiving unit is connected to the optical demodulator; in each RRU, the first interface of the first uplink circulator 503 and the first interface of the second uplink circulator 504 are respectively Connected to the first optical coupler, the first optical coupler, the optical external modulator, and the receiver are connected in sequence; between the BBU101 and the upper-level RRU102 of the BBU101, the second uplink loop between the BBU101 and the upper-level RRU102 connected to the second interface of the device 504; between the BBU101 and the next-level RRU102 of the BBU101, the BBU101 is connected to the second interface of the first uplink circulator 503 of the next-level RRU102; between two adjacent RRU102, as The second interface of the second uplink circulator 504 of the upper-level RRU102 is connected to the second interface of the first uplink circulator 503 of the lower-level RRU102;

For the downlink 103, the BBU101 is specifically used to send the downlink signal that needs to be sent through multiple RRUs to the optical modulator through the data sending unit; the optical modulator uses the light of different wavelengths generated by the laser and corresponds to multiple RRUs The carrier wave modulates the downlink signals onto optical carriers of different wavelengths, and multiplexes the generated modulated optical signals and sends them to the next-level RRU 102 of the BBU 101 through an optical fiber;

Each RRU102 in the plurality of RRU102 except the upper-level RRU102 of the BBU101 is specifically used to receive the optical signal sent by the upper-level device of the RRU102 through the second interface of the first downlink circulator 501; The line circulator 501 sends the optical signal to the first power splitter through the first interface; the first power splitter divides the optical signal into two optical signals, sends one of the optical signals to the optical splitter, and sends the other optical signal to the optical splitter. The optical signal is sent to the second downlink circulator 502 through the first interface of the second downlink circulator 502; the second downlink circulator 502 sends another received optical signal to the next stage of the RRU through the second interface Equipment; the optical splitter separates the optical signal corresponding to the wavelength of the RRU102 from the received optical signal and sends it to the optical demodulator; the optical demodulator demodulates the received optical signal and obtains the required RRU102 The transmitted downlink signal is sent to the transmitter for transmission through the antenna;

The upper-level RRU102 of the BBU101 is specifically used to receive the optical signal sent by the upper-level equipment of the RRU102 through the second interface of the first downlink circulator 501; the first downlink circulator 501 transmits the optical signal through the first interface The signal is sent to the first power splitter; the first power splitter sends the optical signal to the optical splitter; the optical splitter separates the optical signal corresponding to the wavelength of the RRU102 from the received optical signal and sends it to the optical demodulator; The modulator demodulates the received optical signal, and sends the obtained downlink signal that needs to be sent by the RRU to the transmitter for transmission through the antenna;

Further, each RRU102 in the plurality of RRU102 can also be specifically used to receive the optical signal sent by the upper-level device of the RRU102 through the second interface of the first downlink looper 501; the first downlink loop The device 501 sends the optical signal to the first power splitter through the first interface; the first power splitter divides the optical signal into two optical signals, sends one of the optical signals to the optical splitter, and passes the other optical signal through the The first interface of the second downlink circulator 502 sends to the second downlink circulator 502; the second downlink circulator 502 sends another optical signal received to the next-level device of the RRU through the second interface; The optical device separates the optical signal corresponding to the wavelength of the RRU102 from the received optical signal and sends it to the optical demodulator; the optical demodulator demodulates the received optical signal and obtains the downlink signal that needs to be sent by the RRU102 The signal is sent to the transmitter for transmission through the antenna.

For the uplink 104, the BBU101 is specifically used for when the optical demodulator receives the modulated optical signals of multiple RRU102 sent by the upper-level RRU102 of the BBU101 in the ring, the optical demodulator converts the modulated optical signal Signal demodulation to obtain uplink signals sent by multiple RRU102 to BBU101, and send the uplink signals to the receiving module for processing;

Each RRU102 in the plurality of RRU102 is specifically used for the optical external modulator to use the optical carrier of the wavelength corresponding to the RRU102 to modulate the uplink signal received by the receiver onto the optical carrier of the wavelength corresponding to the RRU102, and obtain the modulated The optical signal is sent to the first optical coupler; when the first uplink circulator 503 receives the optical signal sent by the upper-level device of the RRU102 through the second interface, and sends it to the first optical coupler through the first interface , the first optical coupler couples the optical signal sent by the first uplink circulator 503 and the modulated optical signal sent by the optical external modulator, and after the coupled optical signal is multiplexed, it passes through the second uplink loop Otherwise, the first optical coupler sends the modulated optical signal sent by the optical external modulator through the first interface of the second uplink circulator 504 to The second uplink circulator 504 ; the second uplink circulator 504 sends the received optical signal to the next-level device of the RRU 102 through the second interface.

Further, in the uplink 104, when the optical external modulator uses the optical carrier of the wavelength corresponding to the RRU102 to modulate the uplink signal received by the receiver to the optical carrier of the wavelength corresponding to the RRU102 where it is located, the RRU102 can provide a laser or Other devices are used to provide the light source of the optical carrier of the wavelength corresponding to the RRU 102, so that the optical external modulator can use the optical carrier of the corresponding wavelength to modulate the uplink signal.

Further, the optical external modulator can also use the downlink 103 to obtain an optical carrier with a wavelength corresponding to the RRU where it is located, as shown in Figure 5b:

In the wireless access network provided in this embodiment, each RRU may further include: an RSOA, wherein the RSOA is respectively connected to an optical splitter and an optical external modulator.

For the downlink 103, each RRU in the plurality of RRUs is specifically used for an optical splitter to separate the optical signal corresponding to the wavelength of the RRU 102 from the received optical signal, and divide the separated optical signal into two paths, and divide the optical signal into two paths. One optical signal is sent to the optical demodulator, and the other optical signal is sent to RSOA; RSOA filters out the downlink signal carried by the received optical signal to obtain the optical carrier corresponding to the wavelength of RRU102, and the corresponding wavelength The optical carrier is provided to the optical external modulator;

For the uplink 104, each RRU 102 in the plurality of RRUs 102 is specifically used for the optical external modulator to use the optical carrier of the corresponding wavelength obtained from the RSOA to modulate the uplink signal received by the receiver onto the optical carrier of the corresponding wavelength.

Further, the embodiment of the present invention also provides a specific implementation of optical signal transmission in the downlink 103 and uplink 104 when a certain RRU 102 fails, as shown in Figure 5c:

In the radio access network provided in this embodiment, each RRU 102 further includes: a second power divider and a second optical coupler;

Wherein, the second power divider is respectively connected with the third interface of the first downlink circulator 501 and the third interface of the second downlink circulator 502; the second optical coupler is respectively connected with the third interface of the first uplink circulator 503 The third interface and the third interface of the second uplink looper 504 are connected; the first power divider and the second power divider are connected to the optical splitter through a single-pole double-throw switch; the first optical coupler and the second optical coupler are connected through The SPDT switch is connected to the optical external modulator;

The BBU101 is specifically used for when any RRU in the multiple RRU102 fails, for the downlink 103, instruct all the RRU102 between the faulty RRU102 and the BBU101 and as the subordinate device of the faulty RRU102 when the ring is not faulty, so that the single pole of the RRU102 The double-throw switch is connected to the second power splitter and the optical splitter;

For the uplink 104, indicate between the faulty RRU102 and the BBU101, and all RRU102s that are the superior equipment of the faulty RRU102 when the ring is not faulty, so that the single-pole double-throw switch of the RRU102 is connected to the second optocoupler and the optical external modulator;

Each RRU102 in the plurality of RRU102 is specifically used for the downlink, when receiving the instruction sent by the BBU101, the single-pole double-throw switch of the RRU is connected to the second power splitter and the optical splitter; the second downlink loop The device connected to the second interface of the circulator 502 acts as the upper-level device of the RRU in the downlink, and receives the optical signal sent by the upper-level device; the second downlink circulator 502 sends the optical signal to the The second power splitter; the second power splitter divides the optical signal into two optical signals, sends one of the optical signals to the optical splitter, and passes the other optical signal through the third interface of the first downlink looper 501 Send to the first downlink circulator 501; use the device connected to the second interface of the first downlink circulator 501 as the next-level device of the RRU102 in the downlink, and send another optical signal to the next level equipment;

For the uplink, when the instruction sent by the BBU101 is received, the SPDT switch of the RRU102 is connected to the second optical coupler and the optical external modulator; the optical external modulator sends the modulated optical signal to the second optical coupler ; Use the device connected to the second interface of the second uplink circulator 504 as the upper-level device of the RRU in the uplink, and send the received optical signal sent by the upper-level device through the third interface To the second optical coupler; the second optical coupler couples the optical signal sent by the second uplink circulator with the modulated optical signal sent by the optical external modulator, and multiplexes the coupled optical signal , sent to the first uplink circulator through the third interface of the first uplink circulator; the device connected to the second interface of the first uplink circulator is used as the next-level device of the RRU102 in the uplink, and will receive The coupled optical signal is sent to the next-level device.

Further, in this embodiment, the first power divider and the second power divider are connected to the optical splitter through a single-pole double-throw switch; the first optical coupler and the second optical coupler are connected to the optical external modulator through a single-pole double-throw switch connected; for the downlink 103, as shown in Figure 5d, when the RRU102 does not fail, the SPDT switch connects the first power splitter and the optical splitter, as shown in Figure 5e, when the RRU02 fails, the first power splitter is received The RRU 102 of a fault handling instruction disconnects the first power splitter connected to the SPDT switch from the optical splitter, and connects the SPDT switch to the second power splitter and the optical splitter; for the uplink 104, as shown in Figure 5d As shown, when the RRU102 does not fail, the SPDT switch connects the first optocoupler and the optical external modulator, as shown in Figure 5e (assuming that a certain RRU102 omitted in Figure 5e fails), when the RRU02 fails , the RRU 102 receiving the third fault handling instruction disconnects the first optocoupler connected to the SPDT switch from the optical external modulator, and connects the SPDT switch to the second optocoupler and the optical external modulator. That is to say, by using the switching of the SPDT switch, the upper-level device of the RRU 102 that received the instruction becomes the lower-level device, and the lower-level device becomes the upper-level device, thereby realizing the change of the optical signal transmission direction .

Further, in the uplink 104, before the first optical coupler or the second optical coupler sends the coupled optical signal to the next-level equipment, the coupled optical signal needs to be multiplexed, which can be used for multiplexing The device multiplexes the coupled optical signals, and then sends them to the first uplink circulator 503 or the second uplink circulator 504, and the specific implementation manner will not be repeated here.

Furthermore, the embodiment of the present invention realizes the ring architecture of C-RAN, and further realizes the link protection of bidirectional transmission for the uplink and downlink, but the C-RAN architecture still faces a problem that is BBU and RRU The problem of how to transmit high-speed I/Q digital signals between them, in the prior art, the method to solve this problem mainly adopts the data compression technology that reduces the interface transmission rate (CPRI/Ir/OBRI), including the time domain compression scheme ( Such as downsampling rate, nonlinear quantization, IQ data compression, etc.) and frequency domain compression schemes (such as subcarrier compression, etc.). However, these solutions do not have a high data compression rate and cannot meet the bandwidth requirements of the C-RAN architecture. In order to solve this problem, the RoF (radio-over-fiber) technology can be used, that is, the RF analog signal is directly transmitted between the BBU and the RRU through the optical fiber, and the RF unit only needs to be responsible for the photoelectric conversion. For the radio access network provided by the embodiment of the present invention, the RRU can be newly split:

For the downlink, divide between the upconverter and the power amplifier, and for the uplink, divide between the LNA and the downconverter. The RF channel before down-conversion, the RF channel after up-conversion, and the light source signal are placed together with the BBU in a centralized manner. This BBU can be referred to as an enhanced BBU; the power amplifier and antenna, as well as the low-noise amplifier and remote antenna are placed in the RRU. , this RRU can be referred to as a simplified RRU for short. The enhanced BBU and the simplified RRU are connected through optical fibers and various optical devices are added to realize multiple RRUs cascaded into a ring. The uplink and downlink of the same RRU occupy one optical wavelength. At the same time, both uplink and downlink have the function of loop protection: when a certain point on the loop fails to work normally, the reverse direction of the original loop will start to work to ensure the security of the loop. The specific implementation can be as follows:

BBU101, specifically for the downlink 103, the data sending unit converts the baseband digital signal that needs to be sent by multiple RRU102 into a baseband analog signal, and converts the baseband analog signal into an intermediate frequency analog signal, and sends the intermediate frequency analog signal as a downlink signal to The optical modulator; for the uplink 104, the optical demodulator demodulates the received modulated optical signal, obtains an intermediate frequency analog signal sent by a plurality of RRU102 to the BBU101 as an uplink signal, and sends the intermediate frequency analog signal Processing for the receiving module, the receiving module converts the intermediate frequency analog signal into a baseband analog signal, and converts the baseband analog signal into a baseband digital signal for processing;

RRU102, specifically for the downlink 103, the optical demodulator demodulates the optical signal received from the optical splitter, and sends the obtained intermediate frequency analog signal that needs to be sent by the RRU102 as a downlink signal to the transmitter, and the transmitter will The received intermediate frequency analog signal is sent through the antenna after power amplification; for the uplink 104, the optical external modulator uses the optical carrier of the corresponding wavelength obtained from the RSOA to modulate the intermediate frequency analog signal received by the receiver as an uplink signal to on the optical carrier corresponding to the wavelength, and send the obtained modulated optical signal to the first optical coupler.

Further, in the prior art, digital signals are transmitted between BBU101 and RRU02, and between RRU102 and RRU102 through optical fiber, and the implementation of the present invention also supports, as follows:

BBU101, specifically for the downlink 103, the data sending unit sends the baseband digital signal that needs to be sent by multiple RRU102 as a downlink signal to the optical modulator; for the uplink 104, the optical demodulator receives the modulated Demodulate the optical signal to obtain baseband digital signals sent by multiple RRUs 102 to the BBU 101 as uplink signals, and send the baseband digital signals to the receiving module for processing;

RRU102, specifically for the downlink 103, the optical demodulator demodulates the optical signal received from the optical splitter, and sends the obtained baseband digital signal that needs to be sent by the RRU102 as a downlink signal to the transmitter, and the transmitter will The received baseband digital signal is converted into a baseband analog signal, and the baseband analog signal is converted into an intermediate frequency analog signal, and the power of the intermediate frequency analog signal is amplified and then sent through the antenna; for the uplink 104, the receiver converts the received intermediate frequency analog signal Convert the baseband analog signal into a baseband digital signal, and send the baseband digital signal as an uplink signal to the optical external modulator. The baseband digital signal is modulated onto the optical carrier of the corresponding wavelength, and the obtained modulated optical signal is sent to the first optical coupler.

Example 3:

Based on the wireless access network provided by the foregoing embodiments of the present invention, the embodiments of the present invention also provide a signal sending method, as shown in FIG. 6 , specifically including:

S601. The BBU sends downlink signals to be sent by multiple RRUs to the optical modulator of the BBU through the data sending unit of the BBU, wherein the multiple RRUs and the BBU are connected in series through optical fibers to form a ring to form a wireless access network.

S602. The optical modulator uses the optical carriers of different wavelengths generated by the laser of the BBU and corresponds to the plurality of RRUs one-to-one to modulate downlink signals onto the optical carriers of different wavelengths.

S603. The BBU multiplexes the modulated optical signal generated in S602 and sends it to the next-level RRU of the BBU in the ring through an optical fiber.

S604. For each RRU in the ring, when the optical signal sent by the upper-level device of the RRU is received through the second interface of the first downlink circulator of the RRU, the first downlink circulator passes the first The interface sends the optical signal to the first power splitter of the RRU.

S605. The first power splitter divides the optical signal into two optical signals, and sends one of the optical signals to the optical splitter of the RRU.

S606. The optical splitter separates the optical signal of the wavelength corresponding to the RRU from the optical signal received in S605, and sends it to the optical demodulator of the RRU.

S607. The optical demodulator demodulates the optical signal received in S606, and sends the obtained downlink signal to be sent by the RRU to the transmitter through the antenna.

S608. The first power divider sends the other optical signal of the two optical signals divided in S605 to the second downlink circulator through the first interface of the second downlink circulator of the RRU.

S609. The second downlink circulator sends the other optical signal received in S608 to the next-level device of the RRU through the second interface.

Further, step S604 to step S609 can be performed for each RRU in the ring except the upper-level RRU of the BBU, then, for the upper-level RRU of the BBU, perform the following steps:

Step 1. When the optical signal sent by the upper-level equipment of the RRU is received through the second interface of the first downlink circulator of the RRU, the first downlink circulator sends the optical signal to the The first power divider of the RRU.

Step 2. The first power splitter sends the optical signal received in step 1 to the optical splitter of the RRU.

Step 3: The optical splitter separates the optical signal of the wavelength corresponding to the RRU from the optical signal received in step 2 and sends it to the optical demodulator of the RRU.

Step 4: The optical demodulator demodulates the optical signal received in Step 3, and sends the obtained downlink signal that needs to be sent by the RRU to the transmitter for transmission through the antenna.

Further, both step S606 and step 3 can be specifically implemented as the following steps:

Step 1. The optical splitter separates the optical signal corresponding to the wavelength of the RRU from the received optical signal, and divides the separated optical signal into two paths; sends one of the optical signals to the optical demodulator of the RRU ;

Step 2. Send the other optical signal to the RSOA of the RRU, wherein the RSOA is used to filter out the downlink signal carried in the received optical signal to obtain an optical carrier with a wavelength corresponding to the RRU.

S610. When any RRU among the multiple RRUs fails, the BBU sends the optical signal modulated with the downlink signal to two RRUs adjacent to the BBU.

S611, the BBU instructs all RRUs between the faulty RRU and the BBU, and when the ring is not faulty, as the subordinate equipment of the faulty RRU, so that the single-pole double-throw switch of the RRU disconnects the first power splitter of the RRU and the optical splitter of the RRU and connect the second power splitter of the RRU with the optical splitter of the RRU.

S612. For each RRU in the plurality of RRUs, judge whether the RRU has received the instruction sent by the BBU. If yes, go to step S613; if not, go to step S618.

S613. According to the instruction, the RRU uses the single pole double throw switch of the RRU to connect the second power splitter and the optical splitter.

S614. Set the device connected to the second interface of the second downlink circulator of the RRU as an upper-level device of the RRU, and receive the modulated optical signal sent by the upper-level device.

S615. The second downlink circulator sends the modulated optical signal to the second power divider of the RRU through the third interface.

S616. The second power divider divides the modulated optical signal into two optical signals, and sends one of the optical signals to the optical splitter, and passes the other optical signal through the first downlink circulator of the RRU. The three interfaces are sent to the first downlink circulator.

S617. Use the device connected to the first downlink circulator through the second interface as a lower-level device of the RRU, and send another optical signal to the lower-level device. This process ends.

S618. Transmit the downlink optical signal according to the direction in which the downlink optical signal is transmitted when the ring is not faulty. This process ends.

Example 4:

Based on the wireless access network provided by the foregoing embodiments of the present invention, the embodiments of the present invention also provide a signal receiving method, as shown in FIG. 7 , specifically including:

S701. For each RRU in the multiple RRUs, the optical external modulator of the RRU uses the optical carrier of the wavelength corresponding to the RRU to modulate the uplink signal received by the receiver of the RRU onto the optical carrier of the corresponding wavelength.

Further, this step can be specifically implemented as: for each RRU in the plurality of RRUs, the optical external modulator of the RRU uses the optical carrier of the wavelength corresponding to the RRU obtained from the RSOA of the RRU to receive The uplink signal received by the machine is modulated onto the optical carrier of the corresponding wavelength, wherein the RSOA is used to filter out the downlink signal carried in the optical signal of the corresponding wavelength of the RRU when the RRU receives the optical signal of the corresponding wavelength of the RRU , to obtain the optical carrier of the wavelength corresponding to the RRU.

S702. Send the modulated optical signal obtained in S701 to the first optical coupler of the RRU.

S703. Whether the first uplink circulator of the RRU receives the optical signal sent by the upper-level equipment of the RRU through the second interface, and sends it to the first optical coupler through the first interface, if so, enter step S704, Otherwise, go to step S707.

S704. The first optical coupler couples the optical signal sent by the first uplink circulator with the modulated optical signal sent by the optical external modulator in S702.

S705. After multiplexing the optical signal coupled in S704, send it to the second uplink circulator through the first interface of the second uplink circulator of the RRU.

S706. The second uplink circulator sends the coupled optical signal received in S705 to the next-level device of the RRU through the second interface. Go to step S709.

S707. The first optical coupler sends the modulated optical signal sent by the optical external modulator in S702 to the second uplink circulator through the first interface of the second uplink circulator.

S708. The second uplink circulator sends the coupled optical signal received in S707 to the next-level device of the RRU through the second interface.

S709. When the BBU receives the modulated optical signals of multiple RRUs sent by the upper-level equipment of the BBU in the ring through the optical demodulator of the BBU, the optical demodulator demodulates the modulated optical signals to obtain multiple An uplink signal sent by RRUs to the BBU.

S710. Send the uplink signal obtained in S709 to the receiving module for processing.

S711. When any RRU in the multiple RRUs of the radio access network fails, the BBU indicates between the faulty RRU and the BBU, and all RRUs that are the superior device of the faulty RRU when the ring is not faulty, so that the The single pole double throw switch of the RRU disconnects the connection between the first optical coupler of the RRU and the optical external modulator of the RRU, and connects the second optical coupler of the RRU with the optical external modulator of the RRU.

S712. For each RRU in the multiple RRUs, judge whether the RRU has received the instruction sent by the BBU. If yes, go to step S713; if not, go to step S718.

S713. According to the instruction, the RRU uses the single pole double throw switch of the RRU to connect the second optical coupler and the optical external modulator of the RRU.

S714. The optical external modulator sends the modulated optical signal to the second optical coupler.

S715. Use the device connected to the second interface of the second uplink circulator of the RRU as the upper-level device of the RRU, and send the received optical signal sent by the upper-level device to the second optocoupler.

Further, in this step, if the optical signal sent by the upper-level equipment is not received, no optical signal is sent to the second optical coupler.

S716. The second optical coupler couples the optical signal sent by the second uplink circulator with the modulated optical signal sent by the optical external modulator, and after the coupled optical signal is multiplexed, passes through the RRU The third interface of the first uplink looper sends to the first uplink looper.

Further, in this step, if the second optical coupler does not receive an optical signal from the upper-level equipment connected to the second uplink looper, then in this step, the second optical coupler directly transmits the optical signal sent by the optical external modulator The modulated optical signal is multiplexed and sent to the first uplink circulator through the third interface of the first uplink circulator.

S717. Use the device connected to the second interface of the first uplink circulator as a lower-level device of the RRU, and send the received coupled optical signal to the lower-level device. This process ends.

S718. Otherwise, the RRU transmits the uplink optical signal in the direction in which the uplink optical signal is transmitted when the ring is not faulty. This process ends.

A wireless access network, a signal sending method, and a receiving method provided by an embodiment of the present invention provide a wireless access network, including a BBU and multiple RRUs, and the one BBU and multiple RRUs are connected in series through an optical fiber to form a ring , when any one of the multiple RRUs fails, the BBU is used to send the downlink optical signal modulated with the downlink signal to its adjacent RRUs for the downlink; When a fault occurs, all RRUs that are subordinate to the faulty RRU transmit downlink optical signals in the direction opposite to the direction in which the downlink optical signal is transmitted when the ring is not faulty; for the uplink, indicate between the faulty RRU and the BBU, and when the ring is not faulty, they are used as faulty RRUs All RRUs of the upper-level equipment transmit uplink optical signals in the direction opposite to the direction of transmitting uplink optical signals when the ring is not faulty; multiple RRUs are used to transmit optical signals according to the instructions when receiving instructions from the BBU; when the BBU is not received When indicated by , the optical signal is transmitted in the direction that the optical signal was transmitted when the ring was not faulty. In the wireless access network proposed by the embodiment of the present invention, when any RRU fails, for the downlink, the two RRUs adjacent to the BBU are used as the transmission starting point, and the downlink is transmitted in two directions close to the faulty RRU in the ring. Optical signals, for the uplink, start from two RRUs adjacent to the faulty RRU, and transmit downlink optical signals in two directions away from the faulty RRU in the ring, that is, when any RRU in the ring fails At this time, the normal data transmission of the ring C-RAN network is guaranteed by bidirectional transmission of optical signals, and link protection is realized.

The functions of the above units may correspond to the corresponding processing steps in the flow charts shown in FIGS. 2 to 3 and 6 to 7 , and will not be repeated here.

Through the above description of the implementation manners, those skilled in the art can clearly understand that the embodiments of the present invention can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions of the embodiments of the present invention can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), Several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, or can be located in one or more devices different from the embodiment according to corresponding changes. The modules in the above embodiments can be combined into one module, and can also be further split into multiple sub-modules.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (14)

1. a wireless access network, comprises a BBU and multiple RRU, and a described BBU and multiple RRU is connected into ring by optical fiber, it is characterized in that, when any one RRU in described multiple RRU breaks down, comprising:

Described BBU, for for down link, two RRU sending to described BBU adjacent respectively the downlink optical signal modulating downstream signal; And between indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU subordinate equipment, transmit downlink optical signal in the opposite direction along transmitting downlink optical signal side during fault non-with described ring;

For up link, indicate between described fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU higher level equipment, transmit uplink optical signal in the opposite direction along transmitting uplink optical signal side during fault non-with described ring;

Described multiple RRU, for when receiving the instruction of described BBU, according to described instruction transmitting optical signal; Otherwise, the direction transmitting optical signal of transmitting optical signal during fault non-according to described ring.

2. wireless access network as claimed in claim 1, it is characterized in that, described BBU comprises: data transmission unit, optical modulator, laser, data receipt unit and optical demodulator; Each described RRU comprises: the first descending loop device, the second descending loop device, the first power splitter, optical splitter, optical demodulator, transmitter, the first up loop device, the second up loop device, the first optical coupler, light external modulator, receiver;

Wherein, for down link, in described BBU, described data transmission unit is connected with described optical modulator respectively with described laser; In each described RRU, the first interface of described first descending loop device and the first interface of described second descending loop device are connected with described first power splitter respectively, and described first power splitter, described optical splitter, described optical demodulator and described transmitter are connected in turn; Between described BBU and the upper level RRU of described BBU, described BBU is connected with the second interface of the second descending loop device of described upper level RRU; Between described BBU and the next stage RRU of described BBU, described BBU is connected with the second interface of the first descending loop device of described next stage RRU; Between adjacent two described RRU, be connected as second interface of the second interface of the second descending loop device of the RRU of upper level with the first descending loop device of the RRU as next stage;

For up link, in described BBU, described data receipt unit is connected with described optical demodulator; In each described RRU, the first interface of described first up loop device and the first interface of described second up loop device are connected with described first optical coupler respectively, and described first optical coupler, described smooth external modulator and described receiver are connected in turn; Between described BBU and the upper level RRU of described BBU, described BBU is connected with the second interface of the second up loop device of described upper level RRU; Between described BBU and the next stage RRU of described BBU, described BBU is connected with the second interface of the first up loop device of described next stage RRU; Between adjacent two described RRU, be connected as second interface of the second interface of the second up loop device of the RRU of upper level with the first up loop device of the RRU as next stage.

3. wireless access network as claimed in claim 2, is characterized in that, for down link, described BBU, specifically for sending to described optical modulator by described data transmission unit by needing the downstream signal sent by described multiple RRU; Described optical modulator utilize described laser to produce with the light carrier of described multiple RRU different wave length one to one, described downstream signal is modulated to respectively on the light carrier of described different wave length, and by the rear next stage RRU being sent to described BBU by optical fiber of the optical multiplexed signal after the modulation of generation;

Each RRU in described multiple RRU except the upper level RRU of described BBU, the light signal that the upper level equipment specifically for the second interface to described RRU that pass through the first descending loop device sends; Described light signal is sent to described first power splitter by first interface by described first descending loop device; Described light signal is divided into two ways of optical signals by described first power splitter, and wherein will send to described optical splitter by a road light signal, and wherein another road light signal is sent to described second descending loop device by the first interface of described second descending loop device; Another road light signal described in reception is sent to the next stage equipment of this RRU by described second descending loop device by the second interface; The light signal of this RRU corresponding wavelength, from the described road light signal received, is separated and sends to described optical demodulator by described optical splitter; The optical signal demodulation that described optical demodulator will receive, and send to described transmitter to be sent by antenna the downstream signal needing this RRU to send obtained;

The upper level RRU of described BBU, the light signal that the upper level equipment specifically for the second interface to described RRU that pass through the first descending loop device sends; Described light signal is sent to described first power splitter by first interface by described first descending loop device; Described light signal is sent to described optical splitter by described first power splitter; The light signal of described RRU corresponding wavelength, from the light signal received, is separated and sends to described optical demodulator by described optical splitter; The optical signal demodulation that described optical demodulator will receive, and send to described transmitter to be sent by antenna the downstream signal needing this RRU to send obtained;

For up link, described BBU, specifically for send as the upper level RRU being received BBU described in described ring by described optical demodulator, light signal after the modulation of described multiple RRU time, described optical demodulator is by the optical signal demodulation after described modulation, obtain the upward signal that described multiple RRU sends to described BBU, and send to described receiver module to process described upward signal;

Each RRU in described multiple RRU, the light carrier with described RRU corresponding wavelength is utilized specifically for described smooth external modulator, the upward signal that described receiver receives is modulated on the light carrier of this RRU corresponding wavelength, and the light signal after the modulation obtained is sent to described first optical coupler; When the light signal that the upper level equipment of the described RRU arrived by the second interface is sent by described first up loop device, and when sending to described first optical coupler by first interface, light signal after the modulation of the light signal that described first up loop device sends by described first optical coupler and described smooth external modulator transmission is coupled, and by the light signal after coupling after multiplexing process, send to described second up loop device by the first interface of described second up loop device; Otherwise the light signal after the modulation that described smooth external modulator sends by described first optical coupler sends to described second up loop device by the first interface of described second up loop device; The light signal received is sent to the next stage equipment of described RRU by described second up loop device by the second interface.

4. wireless access network as claimed in claim 2, is characterized in that, for down link, described BBU, specifically for sending to described optical modulator by described data transmission unit by needing the downstream signal sent by described multiple RRU; Described optical modulator utilize described laser to produce with the light carrier of described multiple RRU different wave length one to one, described downstream signal is modulated to respectively on the light carrier of described different wave length, and by the rear next stage RRU being sent to described BBU by optical fiber of the optical multiplexed signal after the modulation of generation;

Each RRU in described multiple RRU, the light signal that the upper level equipment specifically for the second interface to described RRU that pass through the first descending loop device sends; Described light signal is sent to described first power splitter by first interface by described first descending loop device; Described light signal is divided into two ways of optical signals by described first power splitter, and wherein will send to described optical splitter by a road light signal, and wherein another road light signal is sent to described second descending loop device by the first interface of described second descending loop device; Another road light signal described in reception is sent to the next stage equipment of this RRU by described second descending loop device by the second interface; The light signal of this RRU corresponding wavelength, from the described road light signal received, is separated and sends to described optical demodulator by described optical splitter; The optical signal demodulation that described optical demodulator will receive, and send to described transmitter to be sent by antenna the downstream signal needing this RRU to send obtained;

For up link, described BBU, specifically for send as the upper level RRU being received BBU described in described ring by described optical demodulator, light signal after the modulation of described multiple RRU time, described optical demodulator is by the optical signal demodulation after described modulation, obtain the upward signal that described multiple RRU sends to described BBU, and send to described receiver module to process described upward signal;

Each RRU in described multiple RRU, the light carrier with described RRU corresponding wavelength is utilized specifically for described smooth external modulator, the upward signal that described receiver receives is modulated on the light carrier of this RRU corresponding wavelength, and the light signal after the modulation obtained is sent to described first optical coupler; When the light signal that the upper level equipment of the described RRU arrived by the second interface is sent by described first up loop device, and when sending to described first optical coupler by first interface, light signal after the modulation of the light signal that described first up loop device sends by described first optical coupler and described smooth external modulator transmission is coupled, and by the light signal after coupling after multiplexing process, send to described second up loop device by the first interface of described second up loop device; Otherwise the light signal after the modulation that described smooth external modulator sends by described first optical coupler sends to described second up loop device by the first interface of described second up loop device; The light signal received is sent to the next stage equipment of described RRU by described second up loop device by the second interface.

5. wireless access network as claimed in claim 2, it is characterized in that, each RRU also comprises: RSOA;

Wherein, described RSOA is connected with described optical splitter and light external modulator respectively;

For down link, in described multiple RRU each RRU specifically for described optical splitter from the light signal received, the light signal of described RRU corresponding wavelength is separated, and the light signal separated is divided into two-way, wherein described optical demodulator will be sent to by a road light signal, wherein described RSOA will be sent to by another road light signal; Described RSOA is by the light signal that receives, and the downstream signal filtering of carrying, obtains the light carrier with described RRU corresponding wavelength, and the light carrier of described corresponding wavelength is supplied to described smooth external modulator;

For up link, in described multiple RRU, each RRU utilizes the light carrier of the described corresponding wavelength obtained from described RSOA specifically for described smooth external modulator, is modulated to by the upward signal that described receiver receives on the light carrier of described corresponding wavelength.

6. the wireless access network as described in any one of claim 2-5, is characterized in that, each RRU also comprises: the second power splitter and the second optical coupler;

Wherein, described second power splitter is connected with the 3rd interface of described first descending loop device and the 3rd interface of described second descending loop device respectively; Described second optical coupler is connected with the 3rd interface of described first up loop device and the 3rd interface of described second up loop device respectively; Described first power splitter is connected with described optical splitter by single-pole double-throw switch (SPDT) with described second power splitter; Described first optical coupler is connected with described smooth external modulator by single-pole double-throw switch (SPDT) with described second optical coupler;

Described BBU, specifically for when any one RRU in described multiple RRU breaks down, for down link, between indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU subordinate equipment, make the described single-pole double-throw switch (SPDT) of this RRU connect described second power splitter and described optical splitter;

For up link, indicate between described fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU higher level equipment, make the described single-pole double-throw switch (SPDT) of this RRU connect described second optical coupler and described smooth external modulator;

Each RRU in described multiple RRU, specifically for for down link, when receiving the instruction that described BBU sends, makes the described single-pole double-throw switch (SPDT) of this RRU connect described second power splitter and described optical splitter; The equipment connected by second interface of described second descending loop device as the upper level equipment of this RRU in down link, and receives the light signal of this upper level equipment transmission; Described light signal is sent to described second power splitter by the 3rd interface by described second descending loop device; Described light signal is divided into two ways of optical signals by described second power splitter, wherein will send to described optical splitter by a road light signal, wherein another road light signal is sent to described first descending loop device by the 3rd interface of described first descending loop device; Another road light signal described as the next stage equipment of this RRU in down link, and is sent to this next stage equipment by the equipment connected by described first descending loop device second interface;

For up link, when receiving the instruction that described BBU sends, the described single-pole double-throw switch (SPDT) of this RRU is made to connect described second optical coupler and described smooth external modulator; Light signal after modulation is sent to described second optical coupler by described smooth external modulator; The equipment connected by described second up loop device second interface as the upper level equipment of this RRU in up link, and by the light signal that this upper level equipment received sends, sends to described second optical coupler by the 3rd interface; The light signal that described second up loop device sends by described second optical coupler, be coupled with the light signal after the modulation that described smooth external modulator sends, and by the light signal after coupling after multiplexing process, send to described first up loop device by the 3rd interface of described first up loop device; Light signal after the described coupling received as the next stage equipment of this RRU in up link, and is sent to this next stage equipment by the equipment connected by described first up loop device second interface.

7. a signaling method, is characterized in that, comprising:

When in multiple RRU of wireless access network, any one RRU breaks down, the light signal modulating downstream signal is sent to two RRUs adjacent with described BBU by BBU respectively, wherein, described multiple RRU and described BBU is connected into ring by optical fiber and forms wireless access network; And

Between indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU subordinate equipment, transmit downlink optical signal in the opposite direction along transmitting downlink optical signal side during fault non-with described ring;

For each RRU, when receiving the instruction that described BBU sends, according to the instruction transmission downlink optical signal received;

Otherwise, during fault non-according to described ring, transmit the direction transmission downlink optical signal of downlink optical signal.

8. method as claimed in claim 7, is characterized in that, when described wireless access network does not break down, also comprise:

The optical modulator that BBU will need the downstream signal sent by described multiple RRU to send to described BBU by the data transmission unit of described BBU;

Described optical modulator utilize the laser of described BBU to produce with the light carrier of described multiple RRU different wave length one to one, described downstream signal is modulated to respectively on the light carrier of described different wave length;

BBU is by the rear next stage RRU being sent to BBU described in described ring by optical fiber of the optical multiplexed signal after the modulation of described generation;

For each RRU in described ring, when the light signal sent to the upper level equipment of this RRU by the second interface of the first descending loop device of this RRU, described light signal is sent to first power splitter of this RRU by described first descending loop device by first interface;

Described light signal is divided into two ways of optical signals by described first power splitter, and a wherein road light signal is sent to the optical splitter of this RRU;

The light signal of this RRU corresponding wavelength, from the described road light signal received, is separated and sends to the optical demodulator of this RRU by described optical splitter;

The optical signal demodulation that described optical demodulator will receive, and send to described transmitter to be sent by antenna the downstream signal that described for the needs obtained RRU sends;

Another road light signal in described two ways of optical signals is sent to described second descending loop device by the first interface of the second descending loop device of this RRU by described first power splitter;

Another road light signal described in reception is sent to the next stage equipment of this RRU by described second descending loop device by the second interface.

9. method as claimed in claim 8, it is characterized in that, the light signal of this RRU corresponding wavelength, from the light signal received, is separated and sends to the optical demodulator of this RRU, specifically comprising by described optical splitter:

The light signal of this RRU corresponding wavelength, from the light signal received, is separated by described optical splitter, and the light signal separated is divided into two-way;

A wherein road light signal is sent to the optical demodulator of this RRU;

Wherein another road light signal is sent to the RSOA of this RRU, and wherein, described RSOA is used for the downstream signal filtering will carried in the light signal received, and obtains the light carrier with described RRU corresponding wavelength.

10. method as claimed in claim 8 or 9, it is characterized in that, between BBU indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU subordinate equipment, transmitting downlink optical signal in the opposite direction along transmitting downlink optical signal side during fault non-with described ring, specifically comprising:

Between BBU indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU subordinate equipment, make the single-pole double-throw switch (SPDT) of this RRU disconnect connection between first power splitter of this RRU and the optical splitter of this RRU, and connect second power splitter of this RRU and the optical splitter of this RRU;

When RRU receives the instruction of described BBU transmission, according to the instruction transmission downlink optical signal received, specifically comprise:

For each RRU receiving the instruction that described BBU sends, this RRU according to described instruction, the described single-pole double-throw switch (SPDT) of this RRU is used to connect described second power splitter and described optical splitter;

The equipment connected by second interface of second of this RRU the descending loop device as the upper level equipment of this RRU, and receives the light signal after the modulation of this upper level equipment transmission;

Light signal after described modulation is sent to second power splitter of this RRU by described second descending loop device by the 3rd interface;

Light signal after described modulation is divided into two ways of optical signals by described second power splitter, and wherein will send to described optical splitter by a road light signal, wherein another road light signal is sent to described first descending loop device by the 3rd interface of the first descending loop device of this RRU;

Described first descending loop device is passed through the next stage equipment of equipment as this RRU of the second interface connection, and another road light signal described is sent to this next stage equipment.

11. 1 kinds of signal acceptance methods, is characterized in that, comprising:

When in multiple RRU of wireless access network, any one RRU breaks down, between BBU indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU higher level equipment, uplink optical signal is transmitted in the opposite direction along transmitting uplink optical signal side during fault non-with described ring

Wherein, described multiple RRU and described BBU is connected into ring by optical fiber and forms wireless access network;

For each RRU, when receiving the instruction that described BBU sends, according to the instruction transmission uplink optical signal received,

Otherwise, when not breaking down according to described ring, transmit the direction transmission uplink optical signal of uplink optical signal.

12. methods as claimed in claim 11, is characterized in that, when described wireless access network does not break down, also comprise:

Light external modulator for each RRU in multiple RRU, this RRU utilizes the light carrier with this RRU corresponding wavelength, is modulated to by the upward signal that the receiver of this RRU receives on the light carrier of described corresponding wavelength;

And the light signal after the modulation obtained is sent to first optical coupler of this RRU;

When the light signal that the upper level equipment of this RRU arrived by the second interface is sent by the first up loop device of this RRU, and when sending to described first optical coupler by first interface, the light signal after the light signal that described first up loop device sends by described first optical coupler and the modulation that described smooth external modulator sends is coupled;

And by the light signal after coupling after multiplexing process, send to described second up loop device by the first interface of the second up loop device of this RRU;

Light signal after the described coupling received is sent to the next stage equipment of this RRU by described second up loop device by the second interface;

Otherwise the light signal after the modulation that described smooth external modulator sends by described first optical coupler sends to described second up loop device by the first interface of described second up loop device;

Light signal after the described coupling received is sent to the next stage equipment of this RRU by described second up loop device by the second interface;

When described BBU to receive the light signal after modulation that the upper level equipment of BBU described in described ring sends, described multiple RRU by the optical demodulator of described BBU, described optical demodulator, by the optical signal demodulation after described modulation, obtains the upward signal that described multiple RRU sends to described BBU; And

Described receiver module is sent to process described upward signal.

13. methods as claimed in claim 12, it is characterized in that, the light external modulator for each RRU in multiple RRU, this RRU utilizes the light carrier with this RRU corresponding wavelength, the upward signal that the receiver of this RRU receives is modulated on the light carrier of described corresponding wavelength, specifically comprises:

Light external modulator for each RRU in multiple RRU, this RRU utilize obtain from the RSOA of this RRU, with the light carrier of this RRU corresponding wavelength, the upward signal that the receiver of this RRU receives is modulated on the light carrier of described corresponding wavelength,

Wherein, described RSOA is used for when this RRU receives the light signal of this RRU corresponding wavelength, by the downstream signal filtering carried in the light signal of this RRU corresponding wavelength, obtains the light carrier with this RRU corresponding wavelength.

14. methods as described in claim 12 or 13, it is characterized in that, between BBU indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU higher level equipment, transmitting uplink optical signal in the opposite direction along transmitting uplink optical signal side during fault non-with described ring, specifically comprising:

Between BBU indication fault RRU and described BBU, described ring non-fault time as all RRU of described fault RRU higher level equipment, make the single-pole double-throw switch (SPDT) of this RRU disconnect connection between first optical coupler of this RRU and the light external modulator of this RRU, and connect second optical coupler of this RRU and the light external modulator of this RRU;

When RRU receives the instruction of described BBU transmission, according to the instruction transmission uplink optical signal received, specifically comprise:

For each RRU receiving the instruction that described BBU sends, this RRU according to described instruction, the described single-pole double-throw switch (SPDT) of this RRU is used to connect the light external modulator of described second optical coupler and this RRU;

Light signal after modulation is sent to described second optical coupler by described smooth external modulator;

The equipment connected by second of this RRU up loop device second interface as the upper level equipment of this RRU, and by the light signal that this upper level equipment received sends, sends to described second optical coupler by the 3rd interface;

The light signal that described second up loop device sends by described second optical coupler, be coupled with the light signal after the modulation that described smooth external modulator sends, and by the light signal after coupling after multiplexing process, send to described first up loop device by the 3rd interface of the first up loop device of this RRU;

Light signal after the described coupling received as the next stage equipment of this RRU, and is sent to this next stage equipment by the equipment connected by described first up loop device second interface.