Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems

Definitions

• Baseband radio frequency interface bearer transmission method device and system
• the present invention relates to the field of communications technologies, and in particular, to a baseband radio frequency interface bearer transmission method, apparatus, and system.
• a wireless access network provides a wireless access function for a user.
• RRU Radio
• the remote unit (radio remote unit) and the BBU (Building Base Band Unit) are connected by optical fiber to realize the transmission of baseband data between the RRU and the BBU.
• a CPRI Common Public Radio Interface
• OBSAI Open Base Station Architecture Initiative
• the interface is generally used only by the device itself.
• a base station or an access device needs to share transmission by wavelength division multiplexing, the cost is high.
• the BBU hotel which stacks multiple BBUs together
• the transmission between the RRU and the BBU faces the problem of how to share more.
• FIG. 1 it is a schematic diagram of a prior art transmission sharing between a RRU and a BBU by using a wavelength division technique.
• the return link has only one fiber, and the RRU and PHS (Personal Handy-phone System) base stations need to pass the service to the BBU and ITX control devices on the right (which are the central office devices of the PHS). Therefore, on a single fiber, four wavelengths are required to carry two uplink and downlink signals.
• ⁇ ⁇ is the CPRI signal sent by the RRU to the BBU
• ⁇ 3 is the CPRI signal sent by the BBU to the RRU
• ⁇ 2 is the signal sent by the PHS base station to the
• ⁇ 4 is ⁇ Ethernet sent to the PHS base station signal.
• the corresponding transceiver wavelength between the transceivers needs to be fixed and cannot be replaced at will. If additional uplink and downlink applications need to be added to a single fiber, the new wavelength cannot conflict with the originally planned wavelength.
• the prior art method for implementing transmission sharing between the RRU and the BBU by using the wavelength division technology has the following disadvantages:
• the wavelength of the signal carried on the optical fiber needs one-to-one correspondence planning, which increases the network design and maintenance cost; and the multiplexer (WDM MUX) /DEMUX device, hereinafter referred to as MUX) is a passive device.
• MUX multiplexer
• aspects of the present invention provide a baseband radio frequency interface bearer transmission method, apparatus, and system for mapping a service signal of a client device external to a remote system to a baseband signal for transmission, which is low in cost and easy to monitor.
• An aspect of the present invention provides a baseband radio frequency interface bearer transmission method, including: converting a service signal of a client device into a first baseband signal; the client device is a radio remote module RRU and an indoor baseband processing unit BBU Remote device of the remote system;
• the second baseband signal is carried on the baseband radio frequency interface and transmitted through a line between the RRU and the BBU.
• Another aspect of the present invention provides a baseband radio frequency interface bearer transmission method, including: receiving a second baseband signal from a baseband radio frequency interface; the second baseband signal multiplexing is performed by converting a service signal of a client device Obtaining a first baseband signal, and an original baseband signal between the RRU and the BBU; the client device is an external device of the RRU and the remote system to which the BBU belongs; and a transmission rate of the second baseband signal The transmission rate of the original baseband signal is greater than; the second baseband signal is separated, the first baseband signal and the original baseband signal are obtained, and the original baseband signal is transmitted to the RRU or the BBU;
• the first baseband signal is restored to a traffic signal and passed to the client device.
• Another aspect of the present invention provides a base station data processing control apparatus, including:
• a conversion module configured to convert a service signal of the client device into a first baseband signal
• the client device is an external device of the remote system of the radio remote module RRU and the indoor baseband processing unit BBU;
• the multiplexing module multiplexes the first baseband signal and the original baseband signal between the RRU and the BBU into a second baseband signal; the transmission rate of the second baseband signal is greater than the original Baseband signal transmission rate; and, And a sending module, configured to carry the second baseband signal on the baseband radio frequency interface, and transmit the data between the RRU and the BBU.
• a base transceiver apparatus including:
• a receiving module configured to receive a second baseband signal from the baseband radio frequency interface; the second baseband signal is multiplexed with a first baseband signal obtained by converting a service signal of the client device, and between the RRU and the BBU The original baseband signal; the client device is an external device of the RRU and the remote system to which the BBU belongs; the transmission rate of the second baseband signal is greater than the transmission rate of the original baseband signal;
• a separating module configured to separate the second baseband signal, obtain a first baseband signal and an original baseband signal, and transmit the original baseband signal to the RRU or the BBU;
• a restoration module configured to restore the first baseband signal to a service signal and deliver the signal to the client device.
• Another aspect of the present invention provides a baseband radio frequency interface bearer transmission system, including a BBU and an RRU;
• a base station data processing control device is disposed on the BBU side, and a base station transceiver device is disposed on the RRU side;
• a base station data processing control device is disposed on the RRU side, and a base station transceiver device is disposed on the BBU side;
• a base station data processing control device and a base transceiver station are disposed on the BBU side, and a base station data processing control device and a base transceiver device are disposed on the RRU side.
• the service signal of the client device outside the remote system is converted into a baseband signal, and then the original baseband signal between the RRU and the BBU is multiplexed into a high-speed baseband signal, thereby realizing the RRU and The original baseband signal and the service signal of the client device are simultaneously transmitted on a single physical medium between the BBUs.
• the present invention can provide a high-bandwidth, low-cost information transmission service in a baseband link without adding physical resources; and by detecting a signal on the RRU side or the BBU side, it can determine whether the transmission line is faulty. , easy to monitor.
• 1 is a schematic diagram of the prior art implementing transmission sharing between an RRU and a BBU by using a wavelength division technique
• FIG. 2 is a schematic flowchart of a method for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention
• FIG. 3 is a schematic diagram of converting an Ethernet signal into a baseband signal according to an embodiment of the present invention
• FIG. 5 is a schematic diagram of another Ethernet signal converted to a baseband signal according to an embodiment of the present invention
• FIG. 6 is another baseband radio frequency interface bearer transmission according to an embodiment of the present invention
• FIG. 7 is a schematic structural diagram of a base station data processing control apparatus according to an embodiment of the present invention
• FIG. 8 is a schematic structural diagram of a base station transceiver apparatus according to an embodiment of the present invention.
• FIG. 9 is a schematic structural diagram of a system for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention
• FIG. 10 is a schematic structural diagram of another system for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention
• FIG. 11 is a schematic structural diagram of another system for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention.
• FIG. 2 it is a schematic flowchart of a method for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention.
• the method for carrying and transmitting a baseband radio frequency interface provided by this embodiment includes the following steps:
• the client device Convert the service signal of the client device into a first baseband signal; the client device is an external device of the remote system of the radio remote module RRU and the indoor baseband processing unit BBU.
• the first baseband signal, and the original baseband signal between the RRU and the BBU, are multiplexed into a second baseband signal; the second baseband signal has a transmission rate greater than the original baseband signal. Transmission rate.
• the second baseband signal is carried on a baseband radio frequency interface, and is transmitted through a line between the RRU and the BBU.
• the client device is a device other than the remote system to which the RRU and the BBU belong, and needs to share the physical line between the RRU and the BBU to transmit service data.
• the client device is a device externally accessed by a distributed base station, a video monitoring device, or the like.
• the service signal of the client device may be a synchronization signal or an asynchronous signal.
• asynchronous signals include, but are not limited to, Ethernet (Ethernet) signals and ATM (Asynchronous Transfer Mode) signals.
• the first baseband signal is a baseband signal in a CPRI format of a common public radio interface
• the original baseband signal is a baseband signal in a CPRI format
• the second baseband signal is a baseband in a CPRI format.
• Signal, the baseband radio frequency interface is a CPRI interface.
• the first baseband signal is an open base station architecture protocol.
• the baseband signal in the OBSAI format is a baseband signal in an OBSAI format
• the second baseband signal is a baseband signal in an OBSAI format
• the baseband radio frequency interface is an OBSAI interface.
• steps S21 to S23 may be performed by the RRU built-in or external base station data processing control device, or by the BBU built-in or external base station data processing control device, or built in by the client device or The external base station data processing control device executes.
• the service signal of the client device is an Ethernet signal
• the original baseband signal, the first baseband signal, and the second baseband signal are both CPRI signals
• the service in the above step S21 is taken as an example.
• a method of converting a signal into a baseband signal will be described in detail.
• step S21 the converting the service signal of the client device into the first baseband signal includes: mapping the Ethernet signal of the client device to the CPRI report after being encoded by the 4B/5B In the air interface user plane data area of the text, a first baseband signal in a CPRI format is generated.
• the format of a commonly used Ethernet packet includes: Preamble, SFD (Start Frame Delimiter), and DA (Destination Address). , SA (Source Address), L/T (Length or Type), Data/Padding, FCS (Frame Check Sequence), and Extension (tail extension) ).
• the converted 5Bit data stream is directly mapped into the air interface user data area ( IQ Data Block) of the CPRI message, and the CPRI format can be obtained.
• Baseband signal The data of the air interface user plane data area is digitized baseband data.
• the converting the service signal of the client device to the first baseband signal comprises: encapsulating the Ethernet signal of the client device into a general-purpose encapsulation protocol GFP signal, and then The GFP signal is converted to generate a first baseband signal in CPRI format.
• the 3 ⁇ 4 port is shown in Figure 4.
• the GFP (Generic Framing Procedure) message contains: Core Header, Payload Header, and Ethernet Packet. (Ethernet packet) and Cyclic Redundancy Check (CRC).
• the first four bytes of the GFP packet are the kernel header, the first two bytes indicate the length of the GFP packet, and the last two bytes are the first two bytes of the check.
• the payload header includes: a Payload Type Identifier (PTI), a Payload FCS Indicator (PFI), and an Extension Header Identifier. , referred to as EHI), User Payload Identifier (UPI), Type Header Error Control, and Extension Header.
• the Ethernet packet when the Ethernet signal is encapsulated into the GFP signal, the Ethernet packet is directly encapsulated in the GFP payload; and 0x1 is indicated in the user payload identifier, indicating the Ethernet payload.
• the other fields of the GFP message are generated according to the GFP protocol.
• the Ethernet packet has the same structure as the general Ethernet packet shown in Figure 3, that is, the Ethernet packet starts from the DA and ends at the Extension.
• the encapsulated GFP signal is encapsulated by CPRI to obtain a baseband signal in the CPRI format.
• the "GFP-F" shown in FIG. 4 is one of the methods of encapsulating a client frame into a general-purpose encapsulation frame in a general encapsulation protocol.
• the converting the service signal of the client device to the first baseband signal includes: according to HDLC (High-Level Data Link Control, high)
• the data link control protocol encapsulates the Ethernet signal of the client device into the air interface user plane data area of the CPRI message to generate a first baseband signal in the CPRI format.
• Ethernet signals such as PPP (Point to Point) and LAPS (Link) can be encapsulated according to other series of HDLC-like protocols (HDLC-Link protocol).
• HDLC-Link protocol a series of HDLC-like protocols
• the main feature of the HDLC-Link protocol is to use 0x7E as the framing byte to determine the message length. Use 0x7D5E bytes instead of 0x7E in the original message.
• the Ethernet packet has the same structure as the general Ethernet packet shown in FIG. 3, that is, the Ethernet packet starts from the DA and ends at the Extension.
• the present invention can provide high bandwidth, easy to monitor, and low cost information transmission services by utilizing unused bandwidth in the baseband radio frequency CPRI or OBSAI band.
• the following uses the baseband signal as the CPRI signal as an example.
• the CPRI signal is one of the following seven signals:
• the transmission rate of the original baseband signal (original air interface signal) between the RRU and the BBU is 2457.6 Mbits.
• CPRI can provide a transmission rate of 4915.2 Mbits. If only the original air interface signal is transmitted, that is, the transmission line actually uses only 2457.6 Mbits, then the remaining part is the unused bandwidth in the baseband radio frequency CPRI band.
• the baseband signal with a transmission rate of 2457.6 Mbits is a low-speed baseband signal relative to a baseband signal with a transmission rate of 4915.2 Mbits.
• the service signal of the client device is converted into a baseband signal, and then the low-speed original baseband signal (2457.6 Mbits) between the RRU and the BBU is multiplexed into a high-speed baseband signal. (4915.2 Mbits of data), then transmitted over the 4915.2 Mbits transmission line, enabling the use of unused bandwidth within the baseband radio frequency CPRI band to provide high bandwidth, easy to monitor, low cost information transmission services.
• the original baseband signal and the service signal of the client device are simultaneously transmitted on a single physical medium without adding physical resources.
• FIG. 6 is a schematic flowchart diagram of another method for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention.
• the method for carrying and transmitting a baseband radio frequency interface provided by this embodiment includes the following steps:
• the second baseband signal is multiplexed with a first baseband signal obtained by converting a service signal of the client device, and an original baseband between the RRU and the BBU.
• the client device is an external device of the RRU and the remote system to which the BBU belongs; the transmission rate of the second baseband signal is greater than the transmission rate of the original baseband signal.
• the client device is a device other than the remote system to which the RRU and the BBU belong, and needs to share the physical line between the RRU and the BBU to transmit service data.
• the client device is a device externally accessed by a distributed base station, a video monitoring device, or the like.
• the service signal of the client device may be a synchronization signal or an asynchronous signal.
• asynchronous signals include, but are not limited to, Ethernet (Ethernet) signals and ATM (Asynchronous Transfer Mode) signals.
• the first baseband signal is a baseband signal in a CPRI format of a common public radio interface
• the original baseband signal is a baseband signal in a CPRI format
• the second baseband signal is a baseband in a CPRI format.
• Signal, the baseband radio frequency interface is a CPRI interface.
• the service signal of the client device is an Ethernet signal
• the first baseband signal is mapped to the air interface user plane data area of the CPRI file after the Ethernet signal of the client device is encoded by 4B/5B. And generating a baseband signal in the CPRI format;
• the first baseband signal is a baseband signal in a CPRI format generated by encapsulating an Ethernet signal of the client device into a general encapsulation protocol GFP signal and then converting the GFP signal;
• the first baseband signal is a baseband signal of a CPRI format generated by encapsulating an Ethernet signal of the client device into an air interface user plane data area of a CPRI message according to an advanced data link control HDLC protocol.
• the first baseband signal is a baseband signal in an open base station architecture protocol OBSAI format
• the original baseband signal is a baseband signal in an OBSAI format
• the second baseband signal is in an OBSAI format.
• the baseband signal, the baseband radio frequency interface is an OBSAI interface.
• FIG. 7 is a schematic structural diagram of a base station data processing control apparatus according to an embodiment of the present invention.
• the base station data processing control device (Radio Equipment Control, REC for short) provided in this embodiment can implement the baseband radio frequency interface bearer transmission method in the foregoing embodiment of FIG. 2.
• the base station data processing control apparatus includes a conversion module 71, a multiplexing module 72, and a transmitting module 73, as follows:
• the conversion module 71 is configured to convert the service signal of the client device into the first baseband signal; the client device is an external device of the remote system of the radio remote module RRU and the indoor baseband processing unit BBU.
• the multiplexing module 72 is configured to multiplex the first baseband signal and the original baseband signal between the RRU and the BBU into a second baseband signal; the second baseband signal has a higher transmission rate than the The transmission rate of the original baseband signal is described.
• the sending module 73 is configured to carry the second baseband signal on the baseband radio frequency interface, and transmit the data between the RRU and the BBU.
• the client device is a device other than the remote system to which the RRU and the BBU belong, and needs to share the physical line between the RRU and the BBU to transmit service data.
• the client device is a device externally accessed by a distributed base station, a video monitoring device, or the like.
• the service signal of the client device may be a synchronization signal or an asynchronous signal.
• asynchronous signals include, but are not limited to, Ethernet (Ethernet) signals and ATM (Asynchronous Transfer Mode) signals.
• the first baseband signal is a general public radio interface CPRI
• the baseband signal of the format, the original baseband signal is a baseband signal in a CPRI format, the second baseband signal is a baseband signal in a CPRI format, and the baseband radio frequency interface is a CPRI interface.
• the conversion module 71 When the service signal of the client device is an Ethernet signal, the conversion module 71 performs the 4B/5B encoding on the Ethernet signal of the client device, and then maps the data to the air interface user plane data area of the CPRI file to generate a CPRI format.
• the conversion module 71 encapsulates the Ethernet signal of the client device into a general-purpose encapsulation protocol GFP signal, and then converts the GFP signal to generate a first baseband signal in a CPRI format; or, the conversion module 71 is configured according to The advanced data link controls the HDLC protocol, and encapsulates the Ethernet signal of the client device into the air interface user plane data area of the CPRI message to generate a first baseband signal in the CPRI format.
• the first baseband signal is an open base station architecture protocol.
• FIG. 8 is a schematic structural diagram of a base transceiver apparatus according to an embodiment of the present invention.
• the base station transceiver device (Radio Equipment, RE for short) provided in this embodiment can implement the method for baseband radio frequency interface bearer transmission in the embodiment of FIG. 6.
• the base transceiver device includes a receiving module 81, a separating module 82, and a restoring module 83, as follows:
• the receiving module 81 is configured to receive a second baseband signal from the baseband radio frequency interface; the second baseband signal is multiplexed with a first baseband signal obtained by converting a service signal of the client device, and between the RRU and the BBU The original baseband signal; the client device is an external device of the RRU and the remote system to which the BBU belongs; the transmission rate of the second baseband signal is greater than the transmission rate of the original baseband signal.
• the separating module 82 is configured to separate the second baseband signal, obtain a first baseband signal and an original baseband signal, and transmit the original baseband signal to the RRU or the BBU.
• the restoration module 83 is configured to restore the first baseband signal to a service signal and transmit the signal to the client device.
• the service signal of the client device may be a synchronization signal or an asynchronous signal.
• asynchronous signals include, but are not limited to, Ethernet (ATM) signals and ATM (Asynchronous Transfer Mode) signals.
• ATM ATM
• the first baseband signal is a baseband signal in a CPRI format of a common public radio interface
• the original baseband signal is a baseband signal in a CPRI format
• the second baseband signal is a baseband in a CPRI format.
• the baseband radio frequency interface is a CPRI interface.
• the first baseband signal is an air interface user plane data area that is mapped to a CPRI message after the Ethernet signal of the client device is encoded by 4B/5B.
• the first baseband signal is a baseband signal in a CPRI format generated by encapsulating an Ethernet signal of the client device into a general-package protocol GFP signal and then converting the GFP signal;
• the first baseband signal is a baseband signal in a CPRI format generated by encapsulating an Ethernet signal of the client device into an air interface user plane data area of a CPRI message according to an advanced data link control HDLC protocol.
• the first baseband signal is a baseband signal in an open base station architecture protocol OBSAI format
• the original baseband signal is a baseband signal in an OBSAI format
• the second baseband signal is in an OBSAI format.
• the baseband signal, the baseband radio frequency interface is an OBSAI interface.
• FIG. 9 is a schematic structural diagram of a system for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention.
• the baseband radio frequency interface bearer transmission system provided in this embodiment includes an indoor baseband processing unit 91 (hereinafter referred to as BBU) and a radio remote module 92 (hereinafter referred to as RRU).
• BBU indoor baseband processing unit 91
• RRU radio remote module
• the base station data processing control device 93 (hereinafter referred to as REC) in the above-described embodiment is disposed on the BBU side, and the base transceiver station 94 (hereinafter referred to as RE) in the above-described embodiment of Fig. 8 is disposed on the RRU side.
• the first client device 95 is disposed near the BBU, and the second client device 96 is disposed near the RRU, and the first client device 95 needs to send a service signal to the line between the BBU and the RRU.
• the second client device 96 is taken as an example to describe a method for carrying and transmitting a baseband radio frequency interface.
• the traffic signal from the first client device 95 into a first baseband signal in the REC in the direction in which the signal is transmitted from the REC to the RE; then the first baseband signal, and the low speed in the BBU to RRU direction
• the original baseband signals are multiplexed together into a high-speed second baseband signal, and the high-speed second baseband signal is transmitted to the RE near-end through the optical fiber line between the BBU and the RRU.
• the RE receives the high speed second baseband signal and separates the high speed second baseband signal to obtain the original baseband signal and the first baseband signal.
• the original baseband signal is then transmitted to the RRU for processing by the original wireless module. And, the first baseband signal is restored to a traffic signal and transmitted to the second client device 96.
• FIG. 10 is a schematic structural diagram of another system for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention.
• the baseband radio frequency interface bearer transmission system provided in this embodiment includes an indoor baseband processing unit 101 (hereinafter referred to as BBU) and a radio remote module 102 (hereinafter referred to as RRU).
• BBU indoor baseband processing unit 101
• RRU radio remote module 102
• the base station transceiver 103 (hereinafter referred to as RE) in the above-described embodiment of Fig. 8 is disposed on the BBU side, and the base station data processing control device 104 (hereinafter referred to as REC) in the above-described embodiment of Fig. 7 is disposed on the RRU side.
• a client device 105 is taken as an example to describe a method for carrying and transmitting a baseband radio frequency interface.
• FIG. 11 is a schematic structural diagram of another system for carrying and transmitting a baseband radio frequency interface according to an embodiment of the present invention.
• the baseband radio frequency interface bearer transmission system provided in this embodiment includes an indoor baseband processing unit 111 (hereinafter referred to as BBU) and a radio remote module 112 (hereinafter referred to as RRU).
• the BBU side is configured with the base station data processing control apparatus in the above-described embodiment and the base station transceiver apparatus in the above-described embodiment of FIG. 8. Further, the RRU side is also configured with the base station data processing in the above-described embodiment of FIG. The control device and the base transceiver device in the above-described embodiment of FIG.
• only the first client device 113 is disposed near the BBU, and is set near the RRU.
• a second client device 114 is taken as an example to describe a method for carrying and transmitting a baseband radio frequency interface.
• the bidirectional data transmission can be implemented, and the service signals of the first client device 113 to the second client device 114 are multiplexed in the baseband signal for transmission in the downlink direction, and the transmission method thereof is the same as the embodiment of FIG. 9 described above.
• the service signal of the second client device 114 to the first client device 113 is multiplexed in the baseband signal for transmission, and the transmission method is the same as the embodiment of FIG. 10 described above, and is not allowed here. Narration.
• the base station data processing control device when the base station data processing control device is disposed on the BBU side, the base station data processing control device may be provided inside the BBU or may be provided outside the BBU.
• the base transceiver device When the base transceiver device is configured on the BBU side, the base transceiver device may be disposed inside the BBU or external to the BBU.
• the base station data processing control device When the base station data processing control device is configured on the RRU side, the base station data processing control device may be disposed inside the RRU or may be disposed outside the RRU.
• the base transceiver device When the base transceiver device is configured on the RRU side, the base transceiver device may be disposed inside the RRU or external to the RRU.
• the baseband radio frequency interface bearer transmission system provided by the embodiment of the present invention, since the unit for processing the baseband signal and the service signal is disposed on the BBU side and the RRU side, the transmission line can be determined by detecting the signal on the RRU side or the BBU side. Whether a fault occurs (for example, whether the fiber between the RRU and the MUX device is interrupted), fault isolation and positioning are good, and it is easy to monitor.
• the method, device and system for carrying and transmitting a baseband radio frequency interface provided by an embodiment of the present invention, by converting a service signal of a client device external to the remote system into a baseband signal, and then combining the original baseband signal between the RRU and the BBU It is multiplexed into the high-speed baseband signal to simultaneously transmit the original baseband signal and the service signal of the client device on a single physical medium between the RRU and the BBU.
• the present invention can provide a high-bandwidth, low-cost information transmission service in a baseband link without adding physical resources. Moreover, by detecting signals on the RRU side or the BBU side, it can be determined whether the transmission line is faulty. , easy to monitor.
• the storage medium may be a magnetic disk, an optical disk, or a read-only memory (Read-Only Memory, ROM) or random access memory (RAM).
• ROM Read-Only Memory
• RAM random access memory

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• 2012
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