CN102118191B - Method, equipment and system for transmitting common public radio interface data - Google Patents
Method, equipment and system for transmitting common public radio interface data Download PDFInfo
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- CN102118191B CN102118191B CN201010002214.4A CN201010002214A CN102118191B CN 102118191 B CN102118191 B CN 102118191B CN 201010002214 A CN201010002214 A CN 201010002214A CN 102118191 B CN102118191 B CN 102118191B
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Abstract
The embodiment of the invention provides a method, equipment and a system for transmitting common public radio interface data. The method comprises the following steps of: receiving the common public radio interface data; performing a synchronization processing on the common public radio interface data to generate a hyper-frame frame head index signal of a common public radio interface; generating the frame format information of a basic frame of the common public radio interface according to the hyper-frame frame head index signal of the common public radio interface and a predetermined adaptive modulation parameter; generating a compressed frame of the common public radio interface according to the hyper-frame frame head index signal of the common pubic radio interface, the adaptive modulation parameters and the frame format information of the basic frame of the common pubic radio interface; and generating microwave data according to the compressed frame of the common pubic radio interface and the frame format information of the basic frame and transmitting the microwave data. In the method, the equipment and the system, the common public radio interface data can be transmitted by using microwave equipment, so that a distributed base station system can use the microwave equipment and the flexibility of equipment deployment is improved.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of transmission method, equipment and system of common public radio interface data.
Background technology
Mobile communication system is comprised of core net (Core Network, CN), wireless access network (UniversalTerrestrial Radion Access Network, UTRAN) and subscriber equipment (User Equipment, UE).Wherein wireless access network is by wireless base station (Base Transceiver Station, BTS) and base station controller (the Base Transceriver Control for controlling a plurality of base stations, BSC) or radio network controller (Radio Network Control, RNC) form, Base Band Unit and the radio frequency unit of conventional wireless base station integrate, can't separate fully, also must increase radio frequency unit when increasing Base Band Unit, cause the radio frequency unit wasting of resources, be unfavorable for networking.
A kind of more effective solution that the distributed base station technology proposes for this problem just, distributed base station system is divided into baseband processing unit (Base Band Unit by wireless base station, BBU) and Remote Radio Unit (Remote Radio Unit, RRU) two parts, connect by optical fiber or cable between the two.Aspect deployed with devices, core net, radio network controller and baseband processing unit are concentrated on to the three unities, planning website deploy radio frequency remote equipment to realize wireless coverage.Because RRU have volume little, lightweight, the characteristics such as simple and convenient are installed, can directly be installed near on the metal mast or metope of aerial position, so the characteristics such as distributed base station system has low cost, disposes flexibly, dilatation is convenient.
Common public radio interface (Common Pubilic Radio Interface; CPRI) be a kind of standard interface between BBU and RRU; in the CPRI standard, the CPRI protocol stack is divided into three planes: user plane (User Plane), control and management plane (C& M Plane) and synchronous plane (SYNC).Wherein, user plane is for transmitting user data, control and management plane is used for transmitting agreement in the L1 layer band that requirement of real-time is higher, based on high speed data link, controls (HDLC) and the two-layer protocol based on Ethernet (Ethernet) and User Defined field, and synchronous plane is for synchronous and timing.The data on these three planes are transmitted on cable or optical fiber in the mode of time division multiplexing (Time Division Multiple, TDM).
Microwave (Microwave, MW) transmit owing to not needing to lay optical fiber or cable, directly by space, transmit data, so in city, remote districts or special area (such as river etc.) have obvious engineering advantage, therefore be applied in traditional mobile communication system, for example, for transmitting the client signal between BBU and RNC, TDM E1 business datum and Ethernet (Ethernet, ETH) business datum.
In realizing process of the present invention, the inventor finds that in prior art, at least there are the following problems: traditional wireless base station is integrated in RRU and BBU on an equipment, but distributed base station system separates RRU setting with BBU, cause between RRU and BBU existing the inaccessible problem of optical fiber, and existing microwave equipment is only supported the client signals such as E1 and ETH, do not support a kind of so new client signal of CPRI.
Summary of the invention
In order to overcome defect of the prior art, the embodiment of the present invention provides a kind of transmission method, equipment and system of CPRI data, to support microwave transfer CPRI data.
A kind of common public radio interface data sending method of the embodiment of the present invention, the method comprises: receive common public radio interface data; Described common public radio interface data is carried out to synchronous the processing with generation common public radio interface superframe frame head index signal; Generate the basic frame frame format information of common public radio interface according to described common public radio interface superframe frame head index signal and default adaptive modulation parameter; Generate the common public radio interface condensed frame according to the basic frame frame format information of described common public radio interface superframe frame head index signal, adaptive modulation parameter and common public radio interface; Generate microwave data and send according to described common public radio interface condensed frame and the basic frame frame format information of common public radio interface.
The embodiment of the present invention is a kind of common public radio interface data method of reseptance also, and the method comprises: receive microwave data; Described microwave data is carried out synchronously to extract microwave payload and microwave expense; Resolve described microwave expense to extract the basic frame frame format information of common public radio interface; Separate adaptive described microwave payload to extract the common public radio interface condensed frame; Generate common public radio interface superframe frame head index signal according to described common public radio interface condensed frame; Generate common public radio interface data and send according to described common public radio interface superframe frame head index signal and the basic frame frame format information of common public radio interface.
Another common public radio interface data dispensing device of the embodiment of the present invention, this device comprises: the uplink receiving unit, for receiving common public radio interface data; The uplink synchronous unit, for carrying out synchronous the processing with generation common public radio interface superframe frame head index signal to described parallel common public radio interface data; The frame format information acquiring unit, for generating the basic frame frame format information of common public radio interface according to described common public radio interface superframe frame head index signal and default adaptive modulation parameter; Compression unit, for generating the common public radio interface condensed frame according to the basic frame frame format information of described common public radio interface superframe frame head index signal, adaptive modulation parameter and common public radio interface; The microwave data generation unit, for generating microwave data according to described common public radio interface condensed frame and the basic frame frame format information of common public radio interface; Up transmitting element, for sending described microwave data.
Another common public radio interface data receiving system of the embodiment of the present invention, this device comprises: descending receiving element, for receiving microwave data; Microwave solution Multi-connection unit, for carrying out microwave data synchronously to extract microwave payload and microwave expense; Microwave expense resolution unit, for resolving described microwave expense to extract the basic frame frame format information of common public radio interface; Microwave payload solution adaptation unit, for going out the common public radio interface condensed frame from described microwave payload solution adaptation; The down-going synchronous unit, for carrying out described common public radio interface condensed frame synchronously to generate common public radio interface superframe frame head index signal; Decompression unit, for the common public radio interface data that decompresses out according to described common public radio interface superframe frame head index signal and the basic frame frame format information of common public radio interface; Descending transmitting element, for sending described common public radio interface data.
The embodiment of the present invention is a kind of transmission system of common public radio interface data also, and this system comprises: the first microwave equipment and the second microwave equipment; The first microwave equipment is connected with Remote Radio Unit, and the common public radio interface data sent for the received RF extension unit, be converted to described common public radio interface data microwave data and be sent to the second microwave equipment; And, receive the microwave data that the second microwave equipment sends, this microwave data is converted to common public radio interface data and is sent to Remote Radio Unit; The second microwave equipment is connected with baseband processing unit, and the microwave data sent for receiving described the first microwave equipment, be converted to described microwave data common public radio interface data and be sent to baseband processing unit; And, receive the common public radio interface data that baseband processing unit sends, this common public radio interface data is converted to microwave data and is sent to the first microwave equipment.
Technique scheme has following advantage or beneficial effect: by transmission method, the equipment and system that a kind of CPRI data are provided, can use microwave equipment to transmit the CPRI data, thereby make the distributed base station system can applied microwave equipment, the flexibility that has improved deployed with devices.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 provides a kind of flow chart of CPRI data transmission method for uplink for the embodiment of the present invention;
Fig. 2 provides a kind of flow chart of CPRI data transmission method for uplink for the embodiment of the present invention;
Fig. 3 provides a kind of structural representation of the CPRI of compression base frame for the embodiment of the present invention;
Fig. 4 provides a kind of flow chart of CPRI data transmission method for uplink for the embodiment of the present invention;
Fig. 5 provides a kind of flow chart of CPRI data receive method for the embodiment of the present invention;
Fig. 6 provides a kind of flow chart of CPRI data receive method for the embodiment of the present invention;
Fig. 7 provides a kind of structure chart of CPRI data sending device for the embodiment of the present invention;
Fig. 8 provides the structure chart of compression unit in a kind of CPRI data sending device for one embodiment of the present invention;
Fig. 9 provides the structure chart of microwave data generation unit in a kind of CPRI data sending device for one embodiment of the present invention;
Figure 10 provides a kind of structure chart of CPRI data sending device for the embodiment of the present invention;
Figure 11 provides a kind of structure chart of CPRI data sink for the embodiment of the present invention;
Figure 12 provides a kind of structure chart of CPRI data sink for the embodiment of the present invention;
Figure 13 provides a kind of structure chart of transmission system of CPRI data for the embodiment of the present invention;
Figure 14 provides a kind of structure chart for the microwave equipment that transmits the CPRI data for the embodiment of the present invention;
Figure 15 provides a kind of structure chart for the microwave equipment CPRI frame compression unit that transmits the CPRI data for one embodiment of the present invention;
Figure 16 provides a kind of structure chart for the microwave equipment CPRI condensed frame lock unit that transmits the CPRI data for one embodiment of the present invention;
The schematic diagram of the clock scheme of the microwave equipment up direction be connected with baseband processing unit BBU that Figure 17 provides for one embodiment of the present invention;
The schematic diagram of the clock scheme of the microwave equipment down direction be connected with baseband processing unit BBU that Figure 18 a, Figure 18 b provide for one embodiment of the present invention;
The schematic diagram of the clock scheme of the microwave equipment down direction be connected with radio frequency remote unit RRU that Figure 19 provides for one embodiment of the present invention;
The schematic diagram of the clock scheme of the microwave equipment up direction be connected with radio frequency remote unit RRU that Figure 20 a, Figure 20 b provide for one embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
Embodiment mono-
The embodiment of the present invention provides a kind of common public radio interface data sending method, and as shown in Figure 1, the method comprises:
In the present embodiment, common public radio interface (CPRI) data are carried out to synchronous the processing and be specially: the control word sync byte K28.5 Z.0.0 in search CPRI superframe, and control word Hyper Frame Number HFN Z.64.0, thus obtain the CPRI superframe-synchronized.Then can on the basis of CPRI superframe-synchronized, further realize CPRI frame synchronization, obtain CPRI superframe frame head index signal;
The transmission method of a kind of common public radio interface data that the embodiment of the present invention provides, can be used microwave equipment to transmit common public radio interface data, thereby make the distributed base station system can applied microwave equipment, the flexibility that has improved deployed with devices.
Embodiment bis-
The embodiment of the present invention provides a kind of common public radio interface data sending method, and as shown in Figure 2, the method comprises:
Step 201, receive common public radio interface (CPRI) data;
Step 202, carry out synchronous the processing with generation CPRI superframe frame head index signal to the CPRI data;
In the present embodiment, parallel C PRI data are carried out to synchronous the processing and be specially: the control word sync byte K28.5 Z.0.0 in search CPRI superframe, and control word Hyper Frame Number HFN Z.64.0, thus obtain the CPRI superframe-synchronized.Then can on the basis of CPRI superframe-synchronized, further realize CPRI frame synchronization, obtain CPRI superframe frame head index signal;
Step 203, generate the basic frame frame format information of CPRI according to CPRI superframe frame head index signal and default adaptive modulation parameter;
The basic frame frame format information of this CPRI comprises: effectively the position of AxC in the basic frame of CPRI, effectively bit number, the CPRI condensed frame of AxC byte number and effectively AxC in the position of CPRI condensed frame;
Affected by the extraneous factors such as weather, when the extraneous factors such as weather change, the link performance that microwave is eated dishes without rice or wine also can change, in order to guarantee certain error rate or the availability of microwave system, microwave system will be adjusted the modulation and demodulation algorithm of transmitting terminal and receiving terminal automatically, i.e. Adaptive Modulation AM (Adaptive Modulate).The major function of Adaptive Modulation is to detect the link performance index that receiving terminal is eated dishes without rice or wine, and, according to testing result, consults and switch modulation, the rectification algorithm of transmitting terminal and receiving terminal.When the modulation and demodulation algorithm of microwave changes, after microwave is done the Adaptive Modulation operation, the transfer rate that microwave is eated dishes without rice or wine will change, and the traffic data rate that microwave equipment can transmit also can change thereupon.After modulation and demodulation algorithm changes, usually, microwave multiple connection/solution multiple connection also may change, with the modulation and demodulation algorithm after Adaptive change.
Wherein, the present embodiment provides following two kinds of methods that generate the basic frame frame format information of CPRI:
1,, according to described CPRI superframe frame head index signal, extract the control word of the basic frame of CPRI; Resolve high speed data link that the control word of the basic frame of described CPRI supports and control (HDLC, High DataLink Control) or EtherChannel with the position of effective AxC in the basic frame of CPRI that obtain the basic frame of this CPRI and comprise and the effective bit number of AxC;
According to described adaptive modulation parameter and effectively the bit number of AxC calculate the byte number of CPRI condensed frame and effectively AxC in the position of CPRI condensed frame;
According to the CPRI standard, CPRI supports the C& at a slow speed based on HDLC; M (controlling and management) channel and the quick C& based on Ethernet; The M channel, the position of each AxC container in the basic frame of CPRI etc. is by being carried on this two class C& at the basic frame frame format information of interior CPRI; The not standardized control of CPRI standard on the M channel itself and managing signaling exchange between RRU and BBU, therefore in order to extract this information in order to carry out the compression of CPRI frame, microwave equipment need to carry out frame synchronization to the CPRI link, then monitors C& Control on the M channel and managing signaling, thus the basic frame frame format information of CPRI extracted.
2, monitor that according to described CPRI superframe frame head index signal the data field of the basic frame of CPRI is to obtain significant bit position information;
Calculate the position of effective AxC in the basic frame of CPRI that the basic frame of this CPRI comprises and the effective bit number of AxC according to described significant bit position information;
According to described adaptive modulation parameter and effectively the bit number of AxC calculate the byte number of CPRI condensed frame and effectively AxC in the position of CPRI condensed frame.
This scheme is monitored without control and the managing signaling of the nonstandardized technique on the above-mentioned HDLC of being carried on or Ethernet, and the analysis of directly passing through the CPRI link data is flowed obtains the basic frame frame format information of CPRI.Because, in the basic frame frame structure of CPRI, the position of control word is fixed, and if comprise in the IQ data block and retain position, these filling bits that retain on position are changeless, every frame is variable for the contrary occupied bit of AxC container.Therefore, can utilize this character directly by the analysis to CPRI link data stream, to obtain the basic frame frame format information of CPRI.
Step 204, generate the CPRI condensed frame according to the basic frame frame format information of CPRI superframe frame head index signal, adaptive modulation parameter and CPRI;
The step of the generation condensed frame that the present embodiment provides is specially: the position according to CPRI superframe frame head index signal, effective AxC in the basic frame of CPRI and the bit number of effective AxC extract control word and effective AxC data of the basic frame of CPRI;
Select to need effective AxC data of transmission according to described adaptive modulation parameter;
The control word of the basic frame of described CPRI and the effective AxC data that need to transmit are generated to the CPRI condensed frame according to time-multiplexed mode.
According to the CPRI standard, the I/Q data be take antenna carrier frequency container (AxC Container) and are mapped in a basic frame as unit, I/Q sampled data in a UMTS chip of the carrier frequency that AxC container has comprised a road antenna, and a basic frame can comprise a plurality of AxC containers, therefore a CPRI link just can carry the IQ sampled data of a plurality of carrier frequency of multi-path antenna simultaneously.The AxC container can be taked compact placement (Packed Positon) and (Flexible Position) the two kinds of modes of placing flexibly are mapped in a basic frame, compact modes of emplacement refers to that each AxC container is in order in Continuous Mappings to a basic frame, remaining bit is for retaining position, and modes of emplacement refers to that each AxC container is mapped in a basic frame by the position of application specifies flexibly, in frame, other bit do not taken by the AxC container is for retaining position.
As shown in Figure 3, for the structure of the compression CPRI base frame after the removal reservation bit, wherein up front, each AxC container is the order continuous arrangement successively for control word, due to the AxC container, not necessarily by byte-aligned, therefore in the end a byte may comprise filling bit.Like this, the basic frame of the CPRI after compression just be take byte as unit and is only comprised control word in the basic frame of former CPRI and the useful information such as each effective AxC container.Take because the CPRI link after compression remains the synchronization link that the basic frame of the fixing compression of length is unit, therefore still can obtain according to the frame synchornization method of former CPRI link the frame synchronization of compression CPRI link.In order again to recover in opposite end the position of each AxC container in the basic frame of CPRI, can transmit by the corresponding expense of microwave channel at this CPRI link of carrying and comprise that the positional information of each AxC container in the basic frame of CPRI etc. is at interior relevant CPRI frame format information.Receiving terminal is known the positional information of each AxC container in the basic frame of CPRI by extracting expense, thereby the compression CPRI base frame of reception is reverted to the CPRI base frame of standard.
Step 205, be converted to parallel C PRI data by serial CPRI data, and carry out 10Bit and decode to 8Bit.
CPRI has defined four kinds of line speeds altogether at present, be 614.4Mbit/s, 1228.8Mbit/s, 2457.6Mbit/s and 3072.0Mbit/s, the frame structure of every kind of speed CPRI circuit is identical, but the word length of corresponding basic frame different (word length is respectively 8,16,32,40 bits or is respectively 1,2,4,5 bytes).The physical circuit of CPRI adopts the 8B/10B line coding, and CPRI data link line speed after the 8B/10B line coding that for example speed is 491.52Mbit/s is 614.4Mbit/s.
Wherein, CPRI is a kind of synchronous transmission link based on certain frame structure, the width that the length of its basic frame is a WCDMA chip (chip), be l/3.84MHz=260.416667ns, a basic frame is by numbering W=0,16 words (word) of 15 form (word of numbering W=0 is control word, and for transmitting the information such as control and management panel data and synchronous plane data, all the other are for transmitting the I/Q data).On the basis of basic frame, every 256 basic frames further form a superframe, 150 superframe physical frames that length of a corresponding universal mobile telecommunications system (Universal Mobile TelecommunicationsSystem, UMTS) is 10ms.For the ease of meaning, use Z (Z=0 in the CPRI standard ... 149) mean the Hyper Frame Number of corresponding certain superframe in the UMTS physical frame of a 10ms, with X (x=0 ... 255) mean the frame number of corresponding certain basic frame in a superframe, the numbering that means corresponding certain word (word) in a basic frame with W (W=0..15), the numbering that means in a basic frame to form the respective byte (byte) of certain word with Y (Y=0..3), mean the numbering of the corresponding positions (bit) of certain word of formation in a basic frame with B (B=0..31).According to the CPRI standard, CPRI is that sync byte K28.5 Z.0.0 and control word Hyper Frame Number HFN (Hyperframe Number) Z.64.0 obtain superframe-synchronized by the control word in each superframe, and then realizes CPRI frame synchronization.
Step 206, generate microwave data and send according to described CPRI condensed frame and the basic frame frame format information of CPRI.
The step of the generation microwave data that the present embodiment provides is specially: the payload section that described CPRI condensed frame is fitted to microwave frame;
The basic frame frame format information of described CPRI is fitted to the overhead area of microwave frame;
Described microwave payload and microwave expense are carried out to multiple connection to form microwave data according to time-multiplexed mode.
Because the microwave transmission bandwidth is generally less than 1Gbit/s, and CPRI data link minimum bandwidth is 614.4Mbit/s, so directly by microwave transparent transmission CPRI data link, can cause bandwidth waste or can't transmit, therefore need to compress processing to the basic frame of CPRI, generally, antenna carrier AxC in the basic frame of CPRI (Antenna Carrier) always can not just in time take the IQ data division position in whole CPRI base frame, for example the WCDMA up data link adopts the 8bit sampling width, 2 * 3.84MHz sampling rate and dual-antenna diversity receive, the speed of 1 AxC is 122.88Mbit/s, if adopt the CPRI link (linear speed is 614.4Mbit/s) that speed is 491.52Mbit/s to transmit 2 AxC, remove control word, the idle bandwidth that 215.04MHz is arranged.For this reason, the present invention is compressed the basic frame of CPRI, after the removal reservation bit, is mapped in the microwave frame structure again.Above-described embodiment provides a kind of CPRI data transmission method for uplink, by microwave, sends the CPRI data, can make between BBU and RRU by microwave transmission CPRI data.
Step 205: serial CPRI data are converted to parallel C PRI data, and carry out 10Bit and decode to 8Bit.
CPRI has defined four kinds of line speeds altogether at present, be 614.4Mbit/s, 1228.8Mbit/s, 2457.6Mbit/s and 3072.0Mbit/s, the frame structure of every kind of speed CPRI circuit is identical, but the word length of corresponding basic frame different (word length is respectively 8,16,32,40 bits or is respectively 1,2,4,5 bytes).The physical circuit of CPRI adopts the 8B/10B line coding, and CPRI data link line speed after the 8B/10B line coding that for example speed is 491.52Mbit/s is 614.4Mbit/s.
Wherein, CPRI is a kind of synchronous transmission link based on certain frame structure, the width that the length of its basic frame is a WCDMA chip (chip), be l/3.84MHz=260.416667ns, a basic frame is by numbering W=0,16 words (word) of 15 form (word of numbering W=0 is control word, and for transmitting the information such as control and management panel data and synchronous plane data, all the other are for transmitting the I/Q data).On the basis of basic frame, every 256 basic frames further form a superframe, 150 superframe physical frames that length of a corresponding universal mobile telecommunications system (Universal Mobile TelecommunicationsSystem, UMTS) is 10ms.For the ease of meaning, use Z (Z=0 in the CPRI standard ... 149) mean the Hyper Frame Number of corresponding certain superframe in the UMTS physical frame of a 10ms, with X (X=0 ... 255) mean the frame number of corresponding certain basic frame in a superframe, the numbering that means corresponding certain word (word) in a basic frame with W (W=0..15), the numbering that means in a basic frame to form the respective byte (byte) of certain word with Y (Y=0..3), mean the numbering of the corresponding positions (bit) of certain word of formation in a basic frame with B (B=0..31).According to the CPRI standard, CPRI is that sync byte K28.5 Z.0.0 and control word Hyper Frame Number HFN (Hyperframe Number) Z.64.0 obtain superframe-synchronized by the control word in each superframe, and then realizes CPRI frame synchronization.
Embodiment tri-
The embodiment of the present invention provides a kind of common public radio interface data sending method, and as shown in Figure 4, the method comprises:
Wherein, the detailed process that described CPRI data are converted to microwave data is same as the previously described embodiments, does not repeat them here.
Above-described embodiment provides a kind of CPRI data transmission method for uplink, can be compressed to be converted to microwave data to the CPRI data and send, thereby can make between BBU and RRU by microwave transmission CPRI data.
Embodiment tetra-
The embodiment of the present invention provides a kind of common public radio interface data method of reseptance, and as shown in Figure 5, the method comprises:
For sync byte K28.5 and the control word Hyper Frame Number HFN Z.64.0 Z.0.0 of the control word in superframe corresponding to search CPRI condensed frame obtains superframe-synchronized and then realize that the CPRI condensed frame is synchronous, obtain CPRI superframe frame head index signal in the present embodiment;
In one embodiment of the present invention, the basic frame frame format information of this common public radio interface comprises:
The position of antenna carrier in the basic frame of common public radio interface, effectively bit number, the common public radio interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame.
Above-described embodiment provides a kind of CPRI data receive method, can be decompressed to be converted to the CPRI data to microwave data and send, thereby can make BBU obtain the data by microwave transmission CPRI.
Embodiment five
The embodiment of the present invention provides a kind of common public radio interface data method of reseptance, and as shown in Figure 6, the method comprises:
Wherein, the detailed process that described CPRI data are converted to microwave data is same as the previously described embodiments, does not repeat them here.
Above-described embodiment provides a kind of CPRI data receive method, can be decompressed to be converted to the CPRI data to microwave data and send, thereby can make RRU obtain the data by microwave transmission CPRI.
Embodiment six
The embodiment of the present invention provides a kind of common public radio interface data dispensing device, and as shown in Figure 7, this device comprises:
Uplink receiving unit 701, for receiving common public radio interface data;
Up converting unit 702, for carrying out synchronous the processing with generation common public radio interface superframe frame head index signal to described parallel common public radio interface data;
Frame format information acquiring unit 703, for generating the basic frame frame format information of common public radio interface according to described common public radio interface superframe frame head index signal and default adaptive modulation parameter; The basic frame frame format information of this CPRI comprises: effectively the position of AxC in the basic frame of CPRI, effectively bit number, the CPRI condensed frame of AxC byte number and effectively AxC in the position of CPRI condensed frame;
Microwave data generation unit 705, for generating microwave data according to described common public radio interface condensed frame and the basic frame frame format information of common public radio interface;
Up transmitting element 706, for sending described microwave data.
In an embodiment of the present invention, described frame format information acquiring unit 703 further comprises:
The first monitor unit, be used for according to described CPRI superframe frame head index signal, extract the control word of the basic frame of CPRI, resolve HDLC channel that the control word of the basic frame of described CPRI supports or EtherChannel with the position of AxC in the basic frame of CPRI that obtain the basic frame of this CPRI and comprise and the effective bit number of AxC;
The first computing unit, for according to described adaptive modulation parameter and effectively the bit number of AxC calculate the byte number of CPRI condensed frame and effectively AxC in the position of CPRI condensed frame.
In another embodiment of the present invention, described frame format information acquiring unit 703 further comprises:
The second monitor unit, for the data field that monitors the basic frame of CPRI according to described CPRI superframe frame head index signal to obtain significant bit position information; Calculate the position of AxC in the basic frame of CPRI that the basic frame of this CPRI comprises and the effective bit number of AxC according to described significant bit position information;
The second computing unit, according to described adaptive modulation parameter and effectively the bit number of AxC calculate the byte number of CPRI condensed frame and effectively AxC in the position of CPRI condensed frame.
In an embodiment of the present invention, as shown in Figure 8, described compression unit 704 further comprises:
In an embodiment of the present invention, as shown in Figure 9, described microwave data generation unit 705 further comprises:
Above-described embodiment provides a kind of CPRI data sending device, can be compressed to be converted to microwave data to the CPRI data and send, thereby can make between BBU and RRU by microwave transmission CPRI data.
Embodiment seven
The embodiment of the present invention provides a kind of common public radio interface data dispensing device, and as shown in figure 10, this device comprises:
Uplink receiving unit 1001, the CPRI data that send for receiving baseband processing unit BBU;
Up converting unit 1002, for being converted to microwave data by described CPRI data;
Up transmitting element 1003, for being sent to described microwave data the microwave equipment be connected with radio frequency remote unit RRU.
Wherein, described up converting unit comprises uplink synchronous unit, frame format information acquiring unit, compression unit, the microwave data generation unit in above-described embodiment, and the function realized is also identical, does not repeat them here.
Above-described embodiment provides a kind of CPRI data sending device, can be compressed to be converted to microwave data to the CPRI data and send, thereby can make between BBU and RRU by microwave transmission CPRI data.
Embodiment eight
The embodiment of the present invention provides a kind of common public radio interface data receiving system, and as shown in figure 11, this device comprises:
Descending receiving element 1101, for receiving microwave data;
Microwave solution Multi-connection unit 1102, for carrying out microwave data synchronously to extract microwave payload and microwave expense;
Microwave expense resolution unit 1103, for resolving described microwave expense to extract the basic frame frame format information of CPRI;
The basic frame frame format information of this CPRI comprises: effectively the position of AxC in the basic frame of CPRI, effectively bit number, the CPRI condensed frame of AxC byte number and effectively AxC in the position of CPRI condensed frame;
Microwave payload solution adaptation unit 1104, for going out the CPRI condensed frame from described microwave payload solution adaptation;
Down-going synchronous unit 1105, for carrying out described CPRI condensed frame synchronously to generate CPRI superframe frame head index signal;
Decompression unit 1106, for the parallel C PRI data that decompress out according to described CPRI superframe frame head index signal and the basic frame frame format information of CPRI;
Descending transmitting element 1107, for sending described CPRI data.
Above-described embodiment provides a kind of CPRI data sink, can be decompressed to be converted to the CPRI data to microwave data and send, thereby can make BBU obtain the data by microwave transmission CPRI.
Embodiment nine
The embodiment of the present invention provides a kind of common public radio interface data receiving system, and as shown in figure 12, this device comprises:
Descending receiving element 1201, for receiving the microwave data of the microwave equipment transmission be connected with baseband processing unit BBU;
Down conversion unit 1202, for being converted to the CPRI data by described microwave data;
Descending transmitting element 1203, for sending described CPRI data to radio frequency remote unit RRU.
Wherein, described down conversion unit comprise with above-described embodiment in microwave solution Multi-connection unit, microwave expense resolution unit, microwave payload solution adaptation unit, decompression unit, the function of its realization is also identical, does not repeat them here.
Above-described embodiment provides a kind of CPRI data sink, can be decompressed to be converted to the CPRI data to microwave data and send, thereby can make RRU obtain the data by microwave transmission CPRI.
Embodiment ten
The embodiment of the present invention provides a kind of transmission system of common public radio interface data, and as shown in figure 13, this system comprises: the first microwave equipment 1301 and the second microwave equipment 1302;
The first microwave equipment 1301 is connected with radio frequency remote unit RRU, and the CPRI data that send for received RF extension unit RRU, be converted to described CPRI data microwave data and be sent to the second microwave equipment 1302; And, receive the microwave data that the second microwave equipment 1302 sends, this microwave data is converted to the CPRI Data Concurrent and delivers to RRU;
The second microwave equipment 1302 is connected with baseband processing unit BBU, and the microwave data sent for receiving described the first microwave equipment 1301, be converted to the CPRI Data Concurrent by described microwave data and deliver to BBU; And, receive the CPRI data that BBU sends, these CPRI data are converted to microwave data and are sent to the first microwave equipment 1301.
Above-described embodiment provides a kind of CPRI data transmission system, can use microwave transfer CPRI data, thereby microwave equipment is applied to distributed base station system, has solved the inaccessible problem of optical fiber between BBU and RRU.
Embodiment 11
The embodiment of the present invention provides that a kind of this microwave equipment is applied to distributed base station system, can connect BBU or RRU for transmitting the microwave equipment of CPRI data, and as shown in figure 14, this microwave equipment comprises:
10B/8B decoding unit 1401, be converted to parallel C PRI data for serial CPRI data, and carry out 10Bit and decode to 8Bit.This 10B/8B decoding unit 1401 can also be lost for detection of line signal (Loss Of Signal, LOS) state, if the CPRI link is cable, 10B/8B decoding unit 1401 also is responsible for detecting the los state of CPRI circuit, at least 16 8B/10B for example in a super frame period, detected and break rules, report the LOS alarm.If the CPRI link is optical cable, can by detecting, whether received optical power is out-of-limit reports the LOS alarm.
CPRI frame synchronization unit 1402: for described parallel C PRI data being carried out to synchronous the processing with generation CPRI superframe frame head index signal;
In one embodiment of the present invention, parallel C PRI data are carried out to synchronous the processing to be specially: the control word sync byte K28.5 Z.0.0 in search CPRI superframe, and control word Hyper Frame Number HFN Z.64.0 obtains superframe-synchronized, and then realize CPRI frame synchronization, obtain CPRI superframe frame head index signal; Before CPRI frame synchronization, output frame is lost (Loss Of Frame, LOF) alarm, after CPRI frame synchronization, exports CPRI superframe frame head index signal to C& M channel or data flow monitor unit 1403 and CPRI compression unit 1404.
C& M channel or data flow monitor unit 1403, for according to CPRI superframe frame head index signal, extract the control word of CPRI base frame, passes to CPRI frame format information extraction unit 1404; Perhaps, monitor each bit of the IQ data field of CPRI base frame, determine which bit belongs to reservation bit, for example monitor the transition times of each bit N continuous frame (N is much larger than 1), transition times be 0 for retaining position, transition times is not 0 the bit occupied for effective AxC, and significant bit position information is sent to CPRI frame format information extraction unit 1404.
CPRI frame format information extraction unit 1404, for resolve HDLC channel that control word supports or EtherChannel with effective AxC of obtaining the basic frame of this CPRI and comprising at the position of the basic frame of CPRI and the effective bit number of AxC; According to described adaptive modulation parameter and effectively the bit number of AxC calculate the byte number of CPRI condensed frame and effectively AxC in the position of CPRI condensed frame.
Perhaps, monitor that according to described CPRI superframe frame head index signal the data field of the basic frame of CPRI is to obtain significant bit position information; Calculate the position of AxC in the basic frame of CPRI that the basic frame of this CPRI comprises and the effective bit number of AxC according to described significant bit position information; According to described adaptive modulation parameter and effectively the bit number of AxC calculate the byte number of CPRI condensed frame and effectively AxC in the position of CPRI condensed frame.
To comprise the position of effective AxC in the basic frame of CPRI, effectively bit number, the CPRI condensed frame of AxC byte number and effectively AxC pass to expense at the basic frame format information of the CPRI of the position of CPRI condensed frame and form unit and CPRI frame compression unit;
CPRI frame compression unit 1405: for according to the basic frame frame format information of described CPRI superframe frame head index signal, adaptive modulation parameter and CPRI, generating the CPRI condensed frame;
As shown in figure 15, in one embodiment of the present invention, described CPRI frame compression unit 1405 comprises:
Control word and effective AxC extraction unit 1501, for according to CPRI superframe frame head index signal, AxC the position of the basic frame of CPRI and effectively the bit number of AxC extract the control word of the basic frame of CPRI and effective AxC data;
AxC selected cell 1502, for select to need effective AxC data of transmission according to described adaptive modulation parameter, if modulating mode is high and Microwave bandwidth enough transmits all effective AxC, send to subordinate's module by control word and effective AxC; If modulating mode is low, Microwave bandwidth can not transmit all effective AxC, according to AxC priority, control word is sent to subordinate's module with effective AxC that can transmit.
The CPRI condensed frame forms unit 1503 by the control word of CPRI and needs effective AxC of transmission to generate the CPRI condensed frame according to time-multiplexed mode; And the CPRI condensed frame is write in FIFO1 for writing clock with the processing clock of up CPRI.
FIFO1 (First Input First Output) unit 1504 buffer memory CPRI condensed frames.
Payload adaptation unit 1406: with the Microwave Treatment clock, for reading clock, read the CPRI condensed frame from FIFO1, the CPRI condensed frame is encapsulated in the adaptation layer frame structure of microwave frame, and carry out CPRI speed to the adaptation of microwave speed, different Payload Unit adds corresponding adaptation layer frame head label, so that can carry out multiple connection in the microwave frame Multi-connection unit.Rate adapted adopts and automatically inserts the realization of adaptation layer idle frame method.If FIFO1 is empty, automatically insert the frequency difference of adaptation layer idle frame with processing clock clock and the Microwave Treatment clock of adaptive CPRI.Discontented for guaranteeing FIFO1, can be greater than the payload section of CPRI condensed frame at the total bytes of 125us for CPRI distributes.
Wherein, the adaptation layer of microwave frame can adopt GEM (G-PON Encapsulation Method, the GPON packing forms) adaptation layer or GFP (Generic Framing Procedure, Generic Framing Procedure) adaptation layer or other packing forms below describe as example based on the GEM adaptation layer take:
GEM is GPON (Gigabit Passive Optical Network, Gigabit Passive Optical Network) service adapting layer, it is a kind of link layer protocol with exchange capacity, both be suitable for the encapsulation of the business datums such as Ethernet, also be suitable for the encapsulation of the business datums such as TDM, be that a kind of integrated service accesses more satisfactory scheme, its frame structure is as shown in table 1.
| PLI 12bit | PortID 12bit | PTI 3bit | HEC 13bit | Pavload |
Table 1GEM frame structure
Ethernet service and TDM business can be mapped to the GEM frame.GEM has payload user data Length Indication PLI, and PLI length can change, and has guaranteed that TDM business and Ethernet service can be that 1byte adjusts and is fitted to the GEM frame by particle.The GPON system is a bit in the network architecture of multiple spot, has port indication Port-ID, can carry out multiplexing or exchange by Port-ID.Payload type indication PTI has indicated payload type, and whether burst is indicated to be mainly used in the Ethernet data bag.
CPRI is mapped to GEM and adopts the TDM mode to shine upon.Every CPRI link takies 1 or a plurality of GEM, and the port indication PortID of the GEM of identical CPRI link is the same, and the PortID of the GEM of different CPRI links not bit is the same.
Microwave frame Multi-connection unit 1408: for each payload part and overhead part are carried out to multiple connection according to time-multiplexed mode, form complete microwave frame structure, send to the microwave modulating unit.Wherein, 1 microwave equipment can transmit many CPRI links, and many CPRI links can carry out time division multiplexing in microwave frame, also can carry out time division multiplexing in microwave frame with other business (such as E1 and ETH).
Microwave sends modulating unit 1409, for the data flow that microwave frame Multi-connection unit 1408 is generated, carries out modulation conversion and becomes intermediate-freuqncy signal, if microwave has adopted multichannel technology, this module also completes the passage distribution function.
IF/RF/ROF unit 1410, process for carrying out intermediate frequency/radio frequency/optical fiber radio frequency transmission technology, and the intermediate-freuqncy signal that up direction sends microwave after modulating unit 1409 is modulated is processed, and obtains the IF/RF/ROF signal, by microwave antenna 1411, sends.The signal that down direction will receive from microwave antenna 1411, after the ROF/RF/IF signal is processed, obtain intermediate-freuqncy signal, sends to microwave receiving modulating unit 1412.
Microwave receiving modulating unit 1412, receive the intermediate-freuqncy signal from the IF/RF/ROF unit, obtains the microwave data of complete digital signal through rectification.
Microwave frame solution Multi-connection unit 1413, carry out frame synchronization to microwave frame, separates multiple connection and go out overhead part and GEM payload part, according to the PortID distribution GEM frame of GEM, arrives each CPRI link processing unit; Perhaps, according to fixing time slot configuration, distribute each GEM frame to each CPRI link processing unit.
Payload solution adaptation unit 1415 is separated adaptation and is gone out the CPRI condensed frame from payload adaptation layer frame structure.Separate adaptation and be specially search adaptation layer valid frame, remove idle frame to extract the CPRI condensed frame, and the CPRI condensed frame is written in FIFO2 for writing clock with the Microwave Treatment clock.When do not search correct adaptation layer frame head in the microwave frame payload section, report adaptation layer LOF alarm.
For example according to the head mistake, control (HEC, Header Error Check) algorithm search GEM frame head, then according to the frame originating point information PLI of GEM, determine payload length.If PLI equals 0, mean that this GEM frame is idle frame, remove idle frame; If PLI is not equal to 0, extract the CPRI condensed frame; If all do not search the GEM frame head in whole microwave payload section, report GEM LOF alarm (LCDG).
CPRI condensed frame lock unit 1416, for carrying out described CPRI condensed frame synchronously to generate CPRI superframe frame head index signal;
As shown in figure 16, in one embodiment of the present invention, described CPRI condensed frame lock unit 1416 comprises:
CPRI frame decompression unit 1417, recover former CPRI frame signal for the basic frame format information of CPRI of the CPRI superframe frame head index signal according to CPRI condensed frame lock unit 1416 output and 1414 outputs of overhead processing unit.
8B/10B coding unit 1418, for carrying out the conversion to serial data of 8B/10B coding and parallel data.
Above-described embodiment provides a kind of microwave equipment of the CPRI of transmission data, the CPRI data can be compressed to be converted to microwave data sends, and can be decompressed to be converted to the transmission of CPRI data to microwave data, thereby can make RRU or BBR receive by the CPRI data of microwave transmission.
Case study on implementation 13
Because wireless base system is the whole network clock system, each RRU clock must be followed the tracks of the clock of BBU, so, by microwave transfer CPRI data the time, microwave equipment also must be followed the tracks of the clock of BBU.
The clock scheme that Figure 17 is the microwave equipment up direction that is connected with baseband processing unit BBU.The present embodiment provides two schemes: a kind of is to adopt global common clock scheme, and microwave equipment obtains the frequency reference of high stability from synchronous clock distribution nets such as global positioning systems (GPS), as the clock source of CPRI link.Another scheme is to adopt to recover the CPRI line clock from the serial data stream of CPRI link.For example adopt PHASE-LOCKED LOOP PLL TECHNIQUE to recover, require this phase-locked loop performance to meet the CPRI standard.
The clock scheme that Figure 18 a and Figure 18 b are the microwave equipment down direction that is connected with baseband processing unit BBU.The present embodiment provides two schemes: a kind of is to adopt the clock of Clock Extraction module output of up direction as the work clock of down direction.Another kind is to adopt the adaptive clock recovery technology, and this technology utilization is carried out the phase-locked loop (PLL) of loop control or the link clock that immediate data frequency synthesizer (DDS) recovers former CPRI based on the empty full scale of FIFO2.
Above embodiment provides a kind of clock processing method of the microwave equipment be connected with BBU, so that microwave equipment can be followed the tracks of the clock of BBU.
Case study on implementation 14
In mobile communication system, the frequency stability of base station radio-frequency unit R RU is had relatively high expectations, and often needs to reach the precision of 0.05ppm, so RRU need to obtain the frequency reference of high stability.Although CPRI itself is the synchronization link of high stable, but due to CPRI in the present invention via microwave transmission, and the GEM adaptation layer is dynamically inserted byte of padding because adaptation rate is adaptive, so CPRI needs again to recover original high stable clock after via the transmission of GEM/ microwave channel.
The clock scheme that Figure 19 is the microwave equipment down direction that is connected with radio frequency remote unit RRU.The present embodiment provides two schemes: a kind of is to adopt global common clock scheme, be that microwave equipment obtains the frequency reference of high stability from synchronous clock distribution nets such as global positioning systems (GRS), as the clock source of CPRI link, so just can guarantee at the microwave equipment of RRU side the high stable requirement of CPRI line clock.Another kind is to adopt the adaptive clock recovery technology, and this technology utilization is carried out the phase-locked loop (PLL) of loop control or the link clock that immediate data frequency synthesizer (DDS) recovers former CPRI based on the empty full scale of FIFO2.
The clock scheme that Figure 20 a and Figure 20 b are the microwave equipment up direction that is connected with radio frequency remote unit RRU.The present embodiment provides two schemes: a kind of is to adopt the clock of clock recovery module output of down direction as the work clock of up direction.Another scheme is to adopt to recover the CPRI line clock from the serial data stream of CPRI link.For example adopt PHASE-LOCKED LOOP PLL TECHNIQUE to recover, require this phase-locked loop performance to meet the CPRI standard.
Above embodiment provides a kind of clock processing method of the microwave equipment be connected with RRU, so that the microwave equipment clock of RRU side can be followed the tracks of the microwave equipment clock of BBU side, thereby RRU can follow the tracks of the clock of BBU.
The above transmission method to a kind of CPRI data provided by the present invention, equipment and system are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (14)
1. a common public radio interface data sending method, is characterized in that, the method comprises:
Receive common public radio interface data;
Described common public radio interface data is carried out to synchronous the processing with generation common public radio interface superframe frame head index signal;
Generate the basic frame frame format information of common public radio interface according to described common public radio interface superframe frame head index signal and default adaptive modulation parameter;
Generate the common public radio interface condensed frame according to the basic frame frame format information of described common public radio interface superframe frame head index signal, adaptive modulation parameter and common public radio interface;
Generate microwave data and send according to described common public radio interface condensed frame and the basic frame frame format information of common public radio interface;
Wherein, according to described common public radio interface condensed frame and the basic frame frame format information generation of common public radio interface microwave data, comprise:
Described common public radio interface condensed frame is fitted to the payload section of microwave frame, the basic frame frame format information of described common public radio interface is fitted to the overhead area of microwave frame;
Described microwave payload and microwave expense are carried out to multiple connection to form microwave data according to time-multiplexed mode.
2. common public radio interface data sending method according to claim 1, is characterized in that, the basic frame frame format information of this common public radio interface comprises:
The position of antenna carrier in the basic frame of common public radio interface, effectively bit number, the common public radio interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame.
3. common public radio interface data sending method according to claim 1, is characterized in that, describedly described common public radio interface data is carried out to synchronous the processing to generate common public radio interface superframe frame head index signal comprises:
The serial common public radio interface data is converted to parallel common public radio interface data;
Described parallel common public radio interface data is carried out to synchronous the processing with generation common public radio interface superframe frame head index signal.
4. common public radio interface data sending method according to claim 1, it is characterized in that, wherein comprise according to described common public radio interface superframe frame head index signal and the default basic frame frame format information of adaptive modulation parameter generation common public radio interface:
According to described common public radio interface superframe frame head index signal, extract the control word of the basic frame of common public radio interface;
Resolve high speed data link control channel that the control word of the basic frame of described common public radio interface supports or EtherChannel with the position of effective antenna carrier in the basic frame of common public radio interface that obtain the basic frame of this common public radio interface and comprise and the effective bit number of antenna carrier;
According to described adaptive modulation parameter and effectively the bit number computer general common wireless interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame; Or
Monitor that according to described common public radio interface superframe frame head index signal the data field of the basic frame of common public radio interface is to obtain significant bit position information;
Calculate the position of effective antenna carrier in the basic frame of common public radio interface that the basic frame of this common public radio interface comprises and the effective bit number of antenna carrier according to described significant bit position information;
According to described adaptive modulation parameter and effectively the bit number computer general common wireless interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame.
5. common public radio interface data sending method according to claim 1, it is characterized in that, wherein according to the basic frame frame format information of described common public radio interface superframe frame head index signal, adaptive modulation parameter and common public radio interface, generate the common public radio interface condensed frame and comprise:
Position according to common public radio interface superframe frame head index signal, effective antenna carrier in the basic frame of common public radio interface and the bit number of effective antenna carrier extract control word and effective antenna carrier data of the basic frame of common public radio interface;
Select to need effective antenna carrier data of transmission according to described adaptive modulation parameter;
The control word of the basic frame of described common public radio interface and the effective antenna carrier data that need transmission are formed to the common public radio interface condensed frame by time-multiplexed mode.
6. a common public radio interface data method of reseptance, is characterized in that, the method comprises:
Receive microwave data;
Described microwave data is carried out synchronously to extract microwave payload and microwave expense;
Resolve described microwave expense to extract the basic frame frame format information of common public radio interface;
Separate adaptive described microwave payload to extract the common public radio interface condensed frame;
Generate common public radio interface superframe frame head index signal according to described common public radio interface condensed frame;
Generate common public radio interface data and send according to described common public radio interface superframe frame head index signal and the basic frame frame format information of common public radio interface.
7. method according to claim 6, is characterized in that, the basic frame frame format information of this common public radio interface comprises:
The position of antenna carrier in the basic frame of common public radio interface, effectively bit number, the common public radio interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame.
8. a common public radio interface data dispensing device, is characterized in that, this device comprises:
The uplink receiving unit, for receiving common public radio interface data;
The uplink synchronous unit, for carrying out synchronous the processing with generation common public radio interface superframe frame head index signal to described parallel common public radio interface data;
The frame format information acquiring unit, for generating the basic frame frame format information of common public radio interface according to described common public radio interface superframe frame head index signal and default adaptive modulation parameter;
Compression unit, for generating the common public radio interface condensed frame according to the basic frame frame format information of described common public radio interface superframe frame head index signal, adaptive modulation parameter and common public radio interface;
The microwave data generation unit, for generating microwave data according to described common public radio interface condensed frame and the basic frame frame format information of common public radio interface;
Up transmitting element, for sending described microwave data;
Wherein, described microwave data generation unit comprises:
The payload adaptation unit, for being fitted to described common public radio interface condensed frame the payload section of microwave frame structure;
Expense forms unit, for according to the basic frame frame format information of described common public radio interface, generating the microwave expense;
The microwave Multi-connection unit, for carrying out multiple connection to form microwave data to described microwave payload and microwave expense according to time-multiplexed mode.
9. common public radio interface data dispensing device according to claim 8 also comprises:
String converting unit, for being converted to parallel common public radio interface data by the serial common public radio interface data.
10. common public radio interface data dispensing device according to claim 8, is characterized in that, described frame format information acquiring unit comprises:
The first monitor unit, for according to described common public radio interface superframe frame head index signal, monitor that HDLC channel that the control word of the basic frame of common public radio interface is supported or EtherChannel are with the position of effective antenna carrier in the basic frame of common public radio interface that obtain the basic frame of this common public radio interface and comprise and the effective bit number of antenna carrier;
The first computing unit, for according to described adaptive modulation parameter and effectively the bit number computer general common wireless interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame.
11. common public radio interface data dispensing device according to claim 8, is characterized in that, described frame format information acquiring unit comprises:
The second monitor unit, for the data field that monitors the basic frame of common public radio interface according to described common public radio interface superframe frame head index signal to obtain significant bit position information; Calculate the position of antenna carrier in the basic frame of common public radio interface that the basic frame of this common public radio interface comprises and the effective bit number of antenna carrier according to described significant bit position information;
The second computing unit, according to described adaptive modulation parameter and effectively the bit number computer general common wireless interface condensed frame of antenna carrier byte number and effectively antenna carrier in the position of common public radio interface condensed frame.
12. common public radio interface data dispensing device according to claim 8, is characterized in that, described compression unit comprises:
Extraction unit, for according to common public radio interface superframe frame head index signal, effectively antenna carrier the position of the basic frame of common public radio interface and effectively the bit number of antenna carrier extract the control word of the basic frame of common public radio interface and effective antenna carrier data;
Selected cell, for selecting to need effective antenna carrier data of transmission according to described adaptive modulation parameter;
Generation unit, for generating the common public radio interface condensed frame to described control word and the effective antenna carrier data that need transmission by time-multiplexed mode.
13. a common public radio interface data receiving system, is characterized in that, this device comprises:
Descending receiving element, for receiving microwave data;
Microwave solution Multi-connection unit, for carrying out microwave data synchronously to extract microwave payload and microwave expense;
Microwave expense resolution unit, for resolving described microwave expense to extract the basic frame frame format information of common public radio interface;
Microwave payload solution adaptation unit, for going out the common public radio interface condensed frame from described microwave payload solution adaptation;
The down-going synchronous unit, for carrying out described common public radio interface condensed frame synchronously to generate common public radio interface superframe frame head index signal;
Decompression unit, for the common public radio interface data that decompresses out according to described common public radio interface superframe frame head index signal and the basic frame frame format information of common public radio interface;
Descending transmitting element, for sending described common public radio interface data.
14. the transmission system of a common public radio interface data, is characterized in that, this system comprises: the first microwave equipment and the second microwave equipment;
The first microwave equipment is connected with Remote Radio Unit, and the common public radio interface data sent for the received RF extension unit, be converted to described common public radio interface data microwave data and be sent to the second microwave equipment; And, receive the microwave data that the second microwave equipment sends, this microwave data is converted to common public radio interface data and is sent to Remote Radio Unit;
The second microwave equipment is connected with baseband processing unit, and the microwave data sent for receiving described the first microwave equipment, be converted to described microwave data common public radio interface data and be sent to baseband processing unit; And, receive the common public radio interface data that baseband processing unit sends, this common public radio interface data is converted to microwave data and is sent to the first microwave equipment.
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| EP3294001A4 (en) * | 2015-08-11 | 2018-07-11 | Huawei Technologies Co., Ltd. | Digital fronthaul data transmission method, device and system |
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| CN102118191A (en) | 2011-07-06 |
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