CN103166710B - Downlink signal transmission, access device and trunking - Google Patents
Downlink signal transmission, access device and trunking Download PDFInfo
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Abstract
The invention provides a kind of downlink signal transmission, access device and trunking.The method comprises: receive at least two-way downstream signal, carry business datum in this downstream signal; Business datum entrained in this at least two-way downstream signal is mapped in common public radio interface CPRI frame, to make to carry this business datum that at least two-way downstream signal is corresponding in each CPRI frame; The signal of the CPRI frame composition mapping this business datum is converted to light signal; This light signal is sent to trunking.This access device comprises: receiver module, processing module, modular converter and sending module.This trunking comprises: receiver module, modular converter, the first processing module and sending module.Technical scheme of the present invention, by mapping in CPRI frame by business datum entrained at least two-way downstream signal, realizing will at least two-way downstream signal mixed transfer, simplifies the conjunction road access of multisystem signal, reduces and build and O&M cost.
Description
Technical field
The present invention relates to the communication technology, particularly relate to a kind of downlink signal transmission, access device and trunking.
Background technology
Data service is occurred frequently in indoor scene, and in order to meet the demand of user to high-speed data and multimedia service, indoor optical fiber distribution system is the major way solving in-door covering.
In prior art, indoor optical fiber distribution system is to WLAN (wireless local area network) (WirelessLocalAreaNetworks, WLAN) data-signal and broadband services data-signal and 2G, 3G and Long Term Evolution (LongTermEvolution, etc. LTE) multisystem signal closes road access, usual employing multisystem mixing platform (PointofInterface, POI) headend equipment realizes.POI realizes mainly through three decibels (Decibel, dB) electric bridge and mixer.3dB electric bridge is also same frequency combiner, and it can determine to through-put power continuous sampling on direction along transmission line is a certain, an input signal can be divided into two constant amplitudes and have the signal of 90 ° of phase differences each other, and 3dB electric bridge can realize closing road with simple two-way signal frequently.Mixer is that road is closed in frequency-selecting, with the work of filtering multiplexed fashion, can realize the above signal syntheses of two-way.POI is usually used in the large-scale indoor distribution scenes such as subway, station, large-scale exhibition center and airport, and its cost is high, and system is complicated, usually also needs machine room resource.Therefore, adopt in indoor optical fiber distribution system POI system carry out multisystem signal conjunction road access, realize complexity high, build and O&M cost high.
Summary of the invention
The invention provides a kind of downlink signal transmission and system, to simplify the conjunction road access of multisystem signal in indoor optical fiber distribution system, reduce and build and O&M cost.
For realizing object of the present invention, on the one hand, the invention provides a kind of downlink signal transmission, comprising:
Receive at least two-way downstream signal, in described downstream signal, carry business datum;
Business datum entrained in described at least two-way downstream signal is mapped in common public radio interface CPRI frame, with the business datum that at least two-way downstream signal is corresponding described in making to carry in each CPRI frame;
The signal of the CPRI frame composition mapping described business datum is converted to light signal;
Described light signal is sent to trunking.
Present invention also offers a kind of downlink signal transmission, it is characterized in that, comprising:
Receive the light signal that access device sends;
Be converted to the signal of telecommunication to described light signal, the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame;
The business datum mapped in described CPRI frame is mapped in ethernet data frame;
The signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), described signal is converted to after rf signal by radiofrequency signal described in antenna transmission to make described remote radio unit (RRU).
On the other hand, the invention provides a kind of access device, comprising:
Receiver module, for receiving at least two-way downstream signal, carries business datum in described downstream signal;
Processing module, for mapping in common public radio interface CPRI frame by business datum entrained in described at least two-way downstream signal, with the business datum that at least two-way downstream signal is corresponding described in making to carry in each CPRI frame;
Modular converter, for being converted to light signal by the signal of the CPRI frame composition mapping described business datum;
Sending module, for sending to trunking by described light signal.
Present invention also offers a kind of trunking, comprising:
Receiver module, for receiving the light signal that access device sends;
Modular converter, for being converted to the signal of telecommunication to described light signal, the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame;
First processing module, for mapping in ethernet data frame by the business datum mapped in described CPRI frame;
Sending module, for the signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), to be converted to described signal after rf signal by radiofrequency signal described in antenna transmission to make described remote radio unit (RRU).
Technical scheme of the present invention, by business datum entrained at least two-way downstream signal is mapped in CPRI frame, realizing will at least two-way downstream signal mixed transfer, simplifies the conjunction road access of multisystem signal in indoor optical fiber distribution system, reduces and build and O&M cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the embodiment of downlink signal transmission provided by the invention;
Fig. 2 is the flow chart of the another embodiment of downlink signal transmission provided by the invention;
Fig. 3 be embodiment illustrated in fig. 2 in the form of ethernet data frame;
Fig. 4 is the structural representation of the embodiment of access device provided by the invention;
Fig. 5 is the structural representation of the embodiment of trunking provided by the invention;
Fig. 6 is the structural representation of the another embodiment of trunking provided by the invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The techniques described herein may be used in the mixed transfer of at least two-way downstream signal in various communication system, such as current 2G, 3G communication system and next generation communication system, such as global system for mobile communications (GSM, GlobalSystemforMobilecommunications), code division multiple access (CDMA, CodeDivisionMultipleAccess) system, time division multiple access (TDMA, TimeDivisionMultipleAccess) system, Wideband Code Division Multiple Access (WCDMA) (WCDMA, WidebandCodeDivisionMultipleAccessWireless), frequency division multiple access (FDMA, FrequencyDivisionMultipleAddressing) system, OFDM (OFDMA, OrthogonalFrequency-DivisionMultipleAccess) system, Single Carrier Frequency Division Multiple Access (SC-FDMA) system, GPRS (GPRS, GeneralPacketRadioService) system, Long Term Evolution (LTE, LongTermEvolution) system, and other these type of communication systems.The mixed transfer of the downstream signal in WLAN data signal and/or broadband services data-signal and above-mentioned various communication system can also be used for.
Fig. 1 is the flow chart of the embodiment of downlink signal transmission provided by the invention, technical scheme of the present invention is applied to indoor optical-fibre distribution, the indoor optical fiber distribution system framework that is suitable for can by base station, access device, trunking, remote radio unit (RRU) and antenna are formed, following steps can be performed by the access device in indoor optical fiber distribution system, this access device is for realizing the access control function of downstream signal, it realizes access control function specifically by software, the mode that hardware or software and hardware combine realizes, as shown in Figure 1, the concrete steps of the downlink signal transmission of the present embodiment are as follows:
S11: receive at least two-way downstream signal, carry business datum in this downstream signal.
The downstream signal related in the present invention, it can be at least two-way downstream signal that base station sends, these downstream signals can be the downstream signals of the plurality of communication systems used in the present invention of foregoing description, such as: the rf signals such as LTE downstream signal, 3G downstream signal and 2G downstream signal, can also comprise the rf signal such as broadband downstream signal and WLAN downstream signal.At least two-way downstream signal received can from same communication system, also can from different communication systems.
It should be noted that, the downstream signal that access device receives is generally rf signal, radiofrequency signal can be converted to medium frequency electric signal, then medium frequency electric signal is converted to light signal, by optical fiber by above-mentioned Signal transmissions to trunking.
In the present embodiment, receive at least two-way downstream signal, this downstream signal is the digital electric signal of rf signal after intermediate frequency conversion and analog-to-digital conversion that base station sends, and wherein carries business datum.
S12: business datum entrained in this at least two-way downstream signal is mapped to common public radio interface (TheCommonPublicRadioInterface, CPRI) in frame, to make to carry this business datum that at least two-way downstream signal is corresponding in each CPRI frame.
CPRI normalized definition base station data processing and control element (PCE) (RadioEquipmentControl, REC) with base transceiver unit (RadioEquipment, RE) interface relationship between, the data that its data structure can be directly used in repeater carry out far-end transmission.CPRI adopts the mode of numeral to carry out transmission base band.
In the present embodiment, access device receives at least two-way downstream signal, resolve and obtain business datum entrained in this downstream signal, this business datum is mapped in CPRI frame, orthogonal in the same way (In-phase/Quadrature can be passed through, I/Q) data carry this business datum, transmit to be carried this business datum that at least two-way downstream signal is corresponding by CPRI frame.Dissimilar downstream signal is due to bandwidth requirement difference, then can according to the bandwidth requirement of dissimilar downstream signal, the quantity that the business datum preset entrained by unlike signal maps to the I/Q data in CPRI frame is also different, such as, whole world GSM signal bandwidth requires as 200K bits per second (bitspersecond, bps), then can preset in pair I/Q data of data-mapping to 200 entrained by GSM signal, and Wideband Code Division Multiple Access (WCDMA) (WidebandCodeDivisionMultipleAccess, WCDMA) signal bandwidth requires as 2Mbps, then can preset in pair I/Q data of data-mapping to 800 entrained by WCDMA signal.Wherein, a group can be formed by 200 to the I/Q data of 2 bytes.
S13: the signal of the CPRI frame composition mapping this business datum is converted to light signal;
S14: this light signal is sent to trunking.
Because access device in the system architecture of indoor optical-fibre distribution is usually in side, base station, trunking is then set up in roof etc. usually more close to the region of user, distant between access device and trunking, therefore, the signal of the CPRI frame composition mapping this business datum can be changed by electrical-optical, be converted to light signal, by optical fiber, this light signal sent to trunking.
Business datum entrained in described at least two-way downstream signal is mapped in CPRI frame and can adopt multiple mapping method, as a kind of feasible execution mode, can be mapped in the group of the setting quantity of each CPRI frame by the business datum of carrying in the downstream signal of every road, each group is carried by least one subcarrier.Such as: for GSM signal, each group can carry GSM signal by multiple subcarrier, and business datum entrained in GSM signal is mapped in 1 group; WCDMA signal, each group carries WCDMA signal by a subcarrier, and business datum entrained in WCDMA signal can be mapped in 4 groups.
The present invention expands CPRI agreement, and each group forms the I/Q data of 2 bytes by 200, then the length of each group is 6400 bits (bit).The quantity of the group comprised in each CPRI frame can be arranged according to the size of service data transmission amount, according to CPRI protocol specification, the transmission duration of each CPRI frame is 10 milliseconds (ms), if comprise 192 groups in each CPRI frame, then transmission line speed is 1228.8 Gigabits per seconds (Gbps).Also the transmission duration of each CPRI frame can be set to 5ms, if comprise 192 groups in each CPRI frame, then transmission line speed is 2457.6Gbps.
The technical scheme of the present embodiment, by business datum entrained at least two-way downstream signal is mapped in CPRI frame, to at least two-way downstream signal mixed transfer, simplify the conjunction road access of multisystem signal in indoor optical fiber distribution system, reduce and build and O&M cost.
Fig. 2 is the flow chart of the another embodiment of downlink signal transmission provided by the invention, following steps can be performed by the trunking in indoor optical fiber distribution system, this trunking can be such as: near-end machine, can also be a module on near-end machine or unit, for realizing the transmission extension function of downstream signal, the mode that the realization of its function specifically combines by software, hardware or software and hardware realizes, as shown in Figure 2, the concrete steps of the downlink signal transmission of the present embodiment are as follows:
S21: receive the light signal that access device sends;
S22: be converted to the signal of telecommunication to this light signal, this signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in this CPRI frame.
The downstream signal that access device receives is generally rf signal, radiofrequency signal can be converted to medium frequency electric signal, then medium frequency electric signal is converted to light signal, by optical fiber by above-mentioned Signal transmissions to trunking.Trunking then completes down link intermediate frequency light-electricity conversion, transfers to remote radio unit (RRU), also above-mentioned downstream signal can not be converted to the signal of telecommunication, and be transmitted through the fiber to remote radio unit (RRU) by category-5 cable.The signal received is converted to radiofrequency signal by remote radio unit (RRU), and is sent to each receiving terminal by antenna.
In the present embodiment, after trunking receives the light signal that access device sends, this light signal is converted to the signal of telecommunication by light-electricity, and this signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in this CPRI frame.Described at least two-way downstream signal comprises the combination of following any one or two or more downstream signal: LTE downstream signal, 3G downstream signal, 2G downstream signal, broadband downstream signal and WLAN downstream signal.
S23: the business datum mapped in this CPRI frame is mapped in ethernet data frame.
Can be connected by category-5 cable between trunking with remote radio unit (RRU) in system architecture due to indoor optical-fibre distribution, also Fiber connection can be passed through, therefore framing to be carried out to data respectively for Optical Fiber Transmission and category-5 cable transmission, in order to avoid the redundant operation of above-mentioned repetition framing, in the present embodiment, the business datum mapped in this CPRI frame transmitted in a fiber is mapped in ethernet data frame, then this ethernet data frame can transmit in category-5 cable, if pass through Optical Fiber Transmission, then only need to convert electrical signals to light signal, then this ethernet data frame both also can be transmitted through the fiber to remote radio unit (RRU) by category-5 cable.
In Ethernet protocol, possess frame gap except in transmitting data frame, outside the lead code of 16 byte longs, the check bit field of 2 byte longs, valid data length is the indefinite length of 64-1500 bytes (Byte), i.e. 512-12000bit.Then can map in ethernet data frame by the business datum mapped in CPRI frame, namely resolve the business datum in CPRI frame, the check bit field of the lead code and 2 byte longs that this business datum are increased by 16 byte longs forms ethernet data frame.
S24: the signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), to be converted to this signal after rf signal by this radiofrequency signal of antenna transmission to make remote radio unit (RRU).
The business datum mapped in this CPRI frame is mapped to after in ethernet data frame, by category-5 cable or optical fiber, this ethernet data frame is sent to remote radio unit (RRU), remote radio unit (RRU) then needs, by intermediate frequency conversion, the signal that this ethernet data frame forms is converted to radiofrequency signal, then by antenna transmission, this radiofrequency signal is received to make each terminal.
The technical scheme of the present embodiment, by the CPRI frame of access device mixed transfer, ethernet data frame is reassembled as after separating frame, both also remote radio unit (RRU) can be transmitted through the fiber to by category-5 cable to make this ethernet data frame, then without the need to the difference according to transmission medium, repetition framing is carried out to transmitted data, simplify the transfer of data between trunking and remote radio unit (RRU), reduce construction and O&M cost.
Further, broadband downstream signal and/or WLAN downstream signal can also from relaying equipment access, then before the signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), trunking also may receive broadband downstream signal and/or WLAN downstream signal, carries business datum in this broadband downstream signal and/or this WLAN downstream signal.Trunking can map to carrying business datum in this broadband downstream signal and/or described WLAN downstream signal in ethernet data frame.
In the system architecture of indoor optical-fibre distribution, trunking is set up in roof etc. usually more close to the region of user, and therefore broadband downstream signal and WLAN downstream signal also can access from trunking.Can be connected by category-5 cable between trunking with remote radio unit (RRU), also Fiber connection can be passed through, therefore framing to be carried out to data respectively for Optical Fiber Transmission and category-5 cable transmission, in order to avoid the redundant operation of above-mentioned repetition framing, in the present embodiment, the business datum mapped in this CPRI frame transmitted in a fiber is mapped in ethernet data frame, then this ethernet data frame can transmit in category-5 cable, if pass through Optical Fiber Transmission, then only need to convert electrical signals to light signal, then this ethernet data frame both also can be transmitted through the fiber to remote radio unit (RRU) by category-5 cable.In Ethernet protocol, possess frame gap except in transmitting data frame, outside the lead code of 16 byte longs, the check bit field of 2 byte longs, valid data length is the indefinite length of 64-1500 bytes (Byte), i.e. 512-12000bit.
Receive broadband downstream signal and/or WLAN downstream signal, in this broadband downstream signal and/or this WLAN downstream signal, carry business datum.Mapping in ethernet data frame by carrying business datum in broadband downstream signal and/or described WLAN downstream signal, forming ethernet data frame by the check bit field of carrying lead code and 2 byte longs that business datum increases by 16 byte longs in broadband downstream signal and/or described WLAN downstream signal.
The technical scheme of the present embodiment, by the data-mapping in the broadband downstream signal that accessed by trunking and/or WLAN downstream signal in ethernet data frame, both also remote radio unit (RRU) can be transmitted through the fiber to by category-5 cable to make this ethernet data frame, then without the need to the difference according to transmission medium, repetition framing is carried out to transmitted data, simplify the transfer of data between trunking and remote radio unit (RRU), reduce construction and O&M cost.Wherein, the Ethernet data frame length that the embodiment of the present invention relates to can be 818 bytes, comprising: the Frame Check Sequence fields of the extended byte field that the protocol type field that the destination address field (DAF) that the source address field that length is 6 bytes, length are 6 bytes, length are 2 bytes, length are 2 bytes, length to be the data field of 800Byte and length be 2 bytes, see Fig. 3; This extended byte comprises the data type field that length field that length is 1 byte and length are 1 byte, and this length field is for storing the data length in the group of this CPRI frame, and this data type field is for storing the data type in this group.
At access device to when at least two-way downstream signal carries out conjunction road, the business datum of carrying in the downstream signal of every road can be mapped in the group of the setting quantity of each CPRI frame, and each group can form the I/Q data of 2 bytes by 200.Then the length of each group is 6400bit, i.e. 800Byte.Therefore the business datum in CPRI frame is mapped to ethernet data frame and by the data-mapping in broadband downstream signal and/or WLAN downstream signal to ethernet data frame time, using the data in each group as the valid data in ethernet data frame, increase the source address field that length is 6 bytes, length is the destination address field (DAF) of 6 bytes, length is the protocol type field of 2 bytes, length is the lead code of the extended byte field of 2 bytes, extended byte wherein comprises the data type field that length field that length is 1 byte and length are 1 byte, this length field is for storing this as the data length in the group of valid data, this data type field is for storing the data type in this group.The data type field of this 1 byte, available 16 different system numbers represent the data type existed in each group.As shown in table 1, in table there are the type data in 1 representative, and 0 representative does not exist the type data.
Table 1
| Hexadecimal number | GSM | WCDMA | LTE | Broadband signal | WLAN |
| 0X10 | 1 | 0 | 0 | 0 | 0 |
| 0X08 | 0 | 1 | 0 | 0 | 0 |
| 0X04 | 0 | 0 | 1 | 0 | 0 |
| 0X02 | 0 | 0 | 0 | 1 | 0 |
| 0X01 | 0 | 0 | 0 | 0 | 1 |
Then can fix the length of valid data in ethernet data frame, both also remote radio unit (RRU) can be transmitted through the fiber to by category-5 cable to make this ethernet data frame, then without the need to the difference according to transmission medium, repetition framing is carried out to transmitted data, the transfer of data between trunking and remote radio unit (RRU) can be simplified, reduce construction and O&M cost.
Fig. 4 is the structural representation of the embodiment of access device provided by the invention, and as shown in Figure 4, the access device of the present embodiment, comprising: receiver module 11, processing module 12, modular converter 13 and sending module 14.
Receiver module 11, for receiving at least two-way downstream signal, carries business datum in this downstream signal;
Processing module 12, for mapping in common public radio interface CPRI frame, to make to carry this business datum that at least two-way downstream signal is corresponding in each CPRI frame by business datum entrained in this at least two-way downstream signal;
Modular converter 13, for being converted to light signal by the signal of the CPRI frame composition mapping this business datum;
Sending module 14, for sending to trunking by this light signal.
The downstream signal related in the present invention, it can be at least two-way downstream signal that base station sends, these downstream signals can be the downstream signals of the plurality of communication systems used in the present invention of foregoing description, such as: the rf signals such as LTE downstream signal, 3G downstream signal and 2G downstream signal, can also comprise the rf signal such as broadband downstream signal and WLAN downstream signal.At least two-way downstream signal received can from same communication system, also can from different communication systems.
It should be noted that, the downstream signal that access device receives is generally rf signal, radiofrequency signal can be converted to medium frequency electric signal, then medium frequency electric signal is converted to light signal, by optical fiber by above-mentioned Signal transmissions to trunking.
In the present embodiment, receiver module 11 receives at least two-way downstream signal, and this downstream signal is the digital electric signal of rf signal after intermediate frequency conversion and analog-to-digital conversion that base station sends, and wherein carries business datum.
CPRI normalized definition base station data processing and control element (PCE) (RadioEquipmentControl, REC) with base transceiver unit (RadioEquipment, RE) interface relationship between, the data that its data structure can be directly used in repeater carry out far-end transmission.CPRI adopts the mode of numeral to carry out transmission base band.
In the present embodiment, receiver module 11 receives at least two-way downstream signal, resolve and obtain business datum entrained in this downstream signal, this business datum maps in CPRI frame by processing module 12, this business datum can be carried by I/Q data, transmit to be carried this business datum that at least two-way downstream signal is corresponding by CPRI frame.Dissimilar downstream signal is due to bandwidth requirement difference, then can according to the bandwidth requirement of dissimilar downstream signal, the quantity that the business datum preset entrained by unlike signal maps to the I/Q data in CPRI frame is also different, such as, whole world GSM signal bandwidth requires as 200Kbps, then can preset in pair I/Q data of data-mapping to 200 entrained by GSM signal, and WCDMA signal bandwidth requires for 2Mbps, then can preset in pair I/Q data of data-mapping to 800 entrained by WCDMA signal.Wherein, a group can be formed by 200 to the I/Q data of 2 bytes.
Because access device in the system architecture of indoor optical-fibre distribution is usually in side, base station, trunking is then set up in roof etc. usually more close to the region of user, distant between access device and trunking, therefore, the signal of the CPRI frame composition mapping this business datum can be changed by electrical-optical, be converted to light signal, by optical fiber, this light signal sent to trunking.
Business datum entrained in described at least two-way downstream signal maps in CPRI frame by processing module 12 can adopt multiple mapping method, as a kind of feasible execution mode, can be mapped in the group of the setting quantity of each CPRI frame by the business datum of carrying in the downstream signal of every road, each group is carried by least one subcarrier.Such as: for GSM signal, each group can carry GSM signal by multiple subcarrier, and business datum entrained in GSM signal is mapped in 1 group; WCDMA signal, each group carries WCDMA signal by a subcarrier, and business datum entrained in WCDMA signal can be mapped in 4 groups.
The present invention expands CPRI agreement, and each group forms the I/Q data of 2 bytes by 200, then the length of each group is 6400bits.The quantity of the group comprised in each CPRI frame can be arranged according to the size of service data transmission amount, and according to CPRI protocol specification, the transmission duration of each CPRI frame is 10ms, if comprise 192 groups in each CPRI frame, then transmission line speed is 1228.8Gbps.Also the transmission duration of each CPRI frame can be set to 5ms, if comprise 192 groups in each CPRI frame, then transmission line speed is 2457.6Gbps.
The technical scheme of the present embodiment, by business datum entrained at least two-way downstream signal is mapped in CPRI frame, to at least two-way downstream signal mixed transfer, simplify the conjunction road access of multisystem signal in indoor optical fiber distribution system, reduce and build and O&M cost.
The access device that the present embodiment provides, corresponding with the downlink signal transmission shown in Fig. 1, specifically can see the associated description in the method embodiment.
Fig. 5 is the structural representation of the embodiment of trunking provided by the invention, and as shown in Figure 5, the trunking of the present embodiment, comprising: the first receiver module 1, modular converter 2, first processing module 3 and sending module 4.
First receiver module 1, for receiving the light signal that access device sends;
Modular converter 2, for being converted to the signal of telecommunication to described light signal, the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame;
First processing module 3, for mapping in ethernet data frame by the business datum mapped in described CPRI frame;
Sending module 4, for the signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), to be converted to described signal after rf signal by radiofrequency signal described in antenna transmission to make described remote radio unit (RRU).
The downstream signal that access device receives is generally rf signal, radiofrequency signal can be converted to medium frequency electric signal, then medium frequency electric signal is converted to light signal, by optical fiber by above-mentioned Signal transmissions to trunking.Trunking then completes down link intermediate frequency light-electricity conversion, transfers to remote radio unit (RRU), also above-mentioned downstream signal can not be converted to the signal of telecommunication, and be transmitted through the fiber to remote radio unit (RRU) by category-5 cable.The signal received is converted to radiofrequency signal by remote radio unit (RRU), and is sent to each receiving terminal by antenna.
In the present embodiment, after first receiver module 1 receives the light signal of access device transmission, this light signal is converted to the signal of telecommunication by light-electricity by modular converter 2, and this signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in this CPRI frame.Described at least two-way downstream signal comprises the combination of following any one or two or more downstream signal: LTE downstream signal, 3G downstream signal, 2G downstream signal, broadband downstream signal and WLAN downstream signal.
Can be connected by category-5 cable between trunking with remote radio unit (RRU) in system architecture due to indoor optical-fibre distribution, also Fiber connection can be passed through, therefore framing to be carried out to data respectively for Optical Fiber Transmission and category-5 cable transmission, in order to avoid the redundant operation of above-mentioned repetition framing, in the present embodiment, the business datum mapped in this CPRI frame transmitted in a fiber maps in ethernet data frame by the first processing module 3, then this ethernet data frame can transmit in category-5 cable, if pass through Optical Fiber Transmission, then only need to convert electrical signals to light signal, then this ethernet data frame both also can be transmitted through the fiber to remote radio unit (RRU) by category-5 cable.
In Ethernet protocol, possess frame gap except in transmitting data frame, outside the lead code of 16 byte longs, the check bit field of 2 byte longs, valid data length is the indefinite length of 64-1500Bytes, i.e. 512-12000bit.Then can map in ethernet data frame by the business datum mapped in CPRI frame, namely resolve the business datum in CPRI frame, the check bit field of the lead code and 2 byte longs that this business datum are increased by 16 byte longs forms ethernet data frame.
The business datum mapped in this CPRI frame is mapped to after in ethernet data frame, this ethernet data frame is sent to remote radio unit (RRU) by category-5 cable or optical fiber by sending module 4, remote radio unit (RRU) then needs, by intermediate frequency conversion, the signal that this ethernet data frame forms is converted to radiofrequency signal, then by antenna transmission, this radiofrequency signal is received to make each terminal.
The technical scheme of the present embodiment, by the CPRI frame of access device mixed transfer, ethernet data frame is reassembled as after separating frame, both also remote radio unit (RRU) can be transmitted through the fiber to by category-5 cable to make this ethernet data frame, then without the need to the difference according to transmission medium, repetition framing is carried out to transmitted data, simplify the transfer of data between trunking and remote radio unit (RRU), reduce construction and O&M cost.
The trunking that the present embodiment provides, corresponding with the downlink signal transmission shown in Fig. 2, specifically can see the associated description in the method embodiment.
On basis embodiment illustrated in fig. 6, access device can also comprise: the second receiver module 5 and the second processing module 6.
Second receiver module 5, for receiving broadband downstream signal and/or WLAN downstream signal, carries business datum in described broadband downstream signal and/or described WLAN downstream signal;
Second processing module 6, for mapping to carrying business datum in described broadband downstream signal and/or described WLAN downstream signal in ethernet data frame.
In the system architecture of indoor optical-fibre distribution, trunking is set up in roof etc. usually more close to the region of user, and therefore broadband downstream signal and WLAN downstream signal also can access from trunking.Can be connected by category-5 cable between trunking with remote radio unit (RRU), also Fiber connection can be passed through, therefore framing to be carried out to data respectively for Optical Fiber Transmission and category-5 cable transmission, in order to avoid the redundant operation of above-mentioned repetition framing, in the present embodiment, the business datum mapped in this CPRI frame transmitted in a fiber is mapped in ethernet data frame, then this ethernet data frame can transmit in category-5 cable, if pass through Optical Fiber Transmission, then only need to convert electrical signals to light signal, then this ethernet data frame both also can be transmitted through the fiber to remote radio unit (RRU) by category-5 cable.In Ethernet protocol, possess frame gap except in transmitting data frame, outside the lead code of 16 byte longs, the check bit field of 2 byte longs, valid data length is the indefinite length of 64-1500 bytes (Byte), i.e. 512-12000bit.
Second receiver module 5 receives broadband downstream signal and/or WLAN downstream signal, carries business datum in this broadband downstream signal and/or this WLAN downstream signal.Second processing module 6 maps to carrying business datum in broadband downstream signal and/or described WLAN downstream signal in ethernet data frame.Both also remote radio unit (RRU) can be transmitted through the fiber to by category-5 cable to make this ethernet data frame, then without the need to the difference according to transmission medium, repetition framing is carried out to transmitted data, simplify the transfer of data between trunking and remote radio unit (RRU), reduce construction and O&M cost.
Wherein, the Ethernet data frame length that the embodiment of the present invention relates to can be 818 bytes, comprising: the Frame Check Sequence fields of the extended byte field that the protocol type field that the destination address field (DAF) that the source address field that length is 6 bytes, length are 6 bytes, length are 2 bytes, length are 2 bytes, length to be the data field of 800Byte and length be 2 bytes, can see Fig. 3; This extended byte comprises the data type field that length field that length is 1 byte and length are 1 byte, and this length field is for storing the data length in the group of this CPRI frame, and this data type field is for storing the data type in this group.
At access device to when at least two-way downstream signal carries out conjunction road, the business datum of carrying in the downstream signal of every road can be mapped in the group of the setting quantity of each CPRI frame, and each group can form the I/Q data of 2 bytes by 200.Then the length of each group is 6400bit, i.e. 800Byte.Therefore the business datum in CPRI frame is mapped to ethernet data frame and by the data-mapping in broadband downstream signal and/or WLAN downstream signal to ethernet data frame time, using the data in each group as the valid data in ethernet data frame, increase the source address field that length is 6 bytes, length is the destination address field (DAF) of 6 bytes, length is the protocol type field of 2 bytes, length is the lead code of the extended byte field of 2 bytes, extended byte wherein comprises the data type field that length field that length is 1 byte and length are 1 byte, this length field is for storing this as the data length in the group of valid data, this data type field is for storing the data type in this group.The data type field of this 1 byte, available 16 different system numbers represent the data type existed in each group.As shown in table 2, in table there are the type data in 2 representatives, and 0 representative does not exist the type data.
Table 2
| Hexadecimal number | GSM | WCDMA | LTE | Broadband signal | WLAN |
| 0X10 | 1 | 0 | 0 | 0 | 0 |
| 0X08 | 0 | 1 | 0 | 0 | 0 |
| 0X04 | 0 | 0 | 1 | 0 | 0 |
| 0X02 | 0 | 0 | 0 | 1 | 0 |
| 0X01 | 0 | 0 | 0 | 0 | 1 |
Then can fix the length of valid data in ethernet data frame, both also remote radio unit (RRU) can be transmitted through the fiber to by category-5 cable to make this ethernet data frame, then without the need to the difference according to transmission medium, repetition framing is carried out to transmitted data, the transfer of data between trunking and remote radio unit (RRU) can be simplified, reduce construction and O&M cost.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (12)
1. a downlink signal transmission, is characterized in that, comprising:
Receive at least two-way downstream signal, in described downstream signal, carry business datum;
Business datum entrained in described at least two-way downstream signal is mapped in common public radio interface CPRI frame, with the business datum that at least two-way downstream signal is corresponding described in making to carry in each CPRI frame;
The signal of the CPRI frame composition mapping described business datum is converted to light signal;
Described light signal is sent to trunking, makes:
Described trunking is converted to the signal of telecommunication to described light signal, and the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame;
The business datum mapped in described CPRI frame is mapped in ethernet data frame;
The signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), described signal is converted to after rf signal by rf signal described in antenna transmission to make described remote radio unit (RRU).
2. method according to claim 1, is characterized in that, describedly business datum entrained in described at least two-way downstream signal is mapped in CPRI frame, comprising:
The business datum of carrying in the downstream signal of every road be mapped in the group of the setting quantity of each CPRI frame, each described group is carried by least one subcarrier.
3. method according to claim 2, is characterized in that, each described group forms the I/Q data of 2 bytes by 200.
4. a downlink signal transmission, is characterized in that, comprising:
Receive the light signal that access device sends; Access device described in described optical signals is adopted and is obtained with the following method:
Receive at least two-way downstream signal, in described downstream signal, carry business datum;
Business datum entrained in described at least two-way downstream signal is mapped in common public radio interface CPRI frame, with the business datum that at least two-way downstream signal is corresponding described in making to carry in each CPRI frame;
The signal of the CPRI frame composition mapping described business datum is converted to described light signal;
Be converted to the signal of telecommunication to described light signal, the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame;
The business datum mapped in described CPRI frame is mapped in ethernet data frame;
The signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), described signal is converted to after rf signal by rf signal described in antenna transmission to make described remote radio unit (RRU).
5. method according to claim 4, is characterized in that, the described signal by the ethernet data frame composition mapping business datum also comprises before being sent to remote radio unit (RRU):
Receive broadband downstream signal and/or WLAN downstream signal, in described broadband downstream signal and/or described WLAN downstream signal, carry business datum;
Map to carrying business datum in described broadband downstream signal and/or described WLAN downstream signal in ethernet data frame.
6. the method according to claim 4 or 5, it is characterized in that, described Ethernet data frame length is 818 bytes, comprising: the Frame Check Sequence fields of the extended byte field that the protocol type field that the destination address field (DAF) that the source address field that length is 6 bytes, length are 6 bytes, length are 2 bytes, length are 2 bytes, length to be the data field of 800 bytes and length be 2 bytes; Described extended byte comprises the data type field that length field that length is 1 byte and length are 1 byte, and described length field is for storing the data length in the group of described CPRI frame, and described data type field is for storing the data type in described group.
7. an access device, is characterized in that, comprising:
Receiver module, for receiving at least two-way downstream signal, carries business datum in described downstream signal;
Processing module, for mapping in common public radio interface CPRI frame by business datum entrained in described at least two-way downstream signal, with the business datum that at least two-way downstream signal is corresponding described in making to carry in each CPRI frame;
Modular converter, for being converted to light signal by the signal of the CPRI frame composition mapping described business datum;
Sending module, for described light signal is sent to trunking, make: described trunking is converted to the signal of telecommunication to described light signal, the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame; The business datum mapped in described CPRI frame is mapped in ethernet data frame; The signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), described signal is converted to after rf signal by rf signal described in antenna transmission to make described remote radio unit (RRU).
8. access device according to claim 7, is characterized in that, described processing module specifically for:
The business datum of carrying in the downstream signal of every road be mapped in the group of the setting quantity of each CPRI frame, each described group is carried by least one subcarrier.
9. access device according to claim 8, is characterized in that, each described group forms the I/Q data of 2 bytes by 200.
10. a trunking, is characterized in that, comprising:
First receiver module, for receiving the light signal that access device sends, wherein, described access device receives at least two-way downstream signal, carries business datum in described downstream signal; Business datum entrained in described at least two-way downstream signal is mapped in common public radio interface CPRI frame, with the business datum that at least two-way downstream signal is corresponding described in making to carry in each CPRI frame; The signal of the CPRI frame composition mapping described business datum is converted to described light signal;
Modular converter, for being converted to the signal of telecommunication to described light signal, the described signal of telecommunication is made up of CPRI frame, is mapped with the business datum of carrying at least two-way downstream signal in described CPRI frame;
First processing module, for mapping in ethernet data frame by the business datum mapped in described CPRI frame;
Sending module, for the signal of the ethernet data frame composition mapping business datum is sent to remote radio unit (RRU), to be converted to described signal after rf signal by rf signal described in antenna transmission to make described remote radio unit (RRU).
11. trunkings according to claim 10, is characterized in that, also comprise:
Second receiver module, for receiving broadband downstream signal and/or WLAN downstream signal, carries business datum in described broadband downstream signal and/or described WLAN downstream signal;
Second processing module, for mapping to carrying business datum in described broadband downstream signal and/or described WLAN downstream signal in ethernet data frame.
12. trunkings according to claim 10 or 11, it is characterized in that, described Ethernet data frame length is 818 bytes, comprising: the Frame Check Sequence fields of the extended byte field that the protocol type field that the destination address field (DAF) that the source address field that length is 6 bytes, length are 6 bytes, length are 2 bytes, length are 2 bytes, length to be the data field of 800 bytes and length be 2 bytes; Described extended byte comprises the data type field that length field that length is 1 byte and length are 1 byte, and described length field is for storing the data length in the group of described CPRI frame, and described data type field is for storing the data type in described group.
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