CN100479618C - Mobile communication base station system and its backpu protecting method - Google Patents
Mobile communication base station system and its backpu protecting method Download PDFInfo
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- CN100479618C CN100479618C CNB2005100309340A CN200510030934A CN100479618C CN 100479618 C CN100479618 C CN 100479618C CN B2005100309340 A CNB2005100309340 A CN B2005100309340A CN 200510030934 A CN200510030934 A CN 200510030934A CN 100479618 C CN100479618 C CN 100479618C
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Abstract
The present invention discloses mobile base station system and backing up protection method relating to mobile communication technology, to make CPRI interface based mobile base station system reliable transmission between base band control unit and radio frequency unit. The present invention adopts single fiber annular networking to realize CPRI interface transmitting and backing up, base band control unit all transmitting downlink data in two different directional channel, each radio frequency unit node in two channel intercepting said node downlink data and adding node sending base band control unit uplink data, then continue back pass to base band, thereby to realize to up-down going data channel backing up protection, in backing up protected two way data, base band control unit or radio frequency unit selected receiving one preferable data, base band control unit also making time delay correcting to IQ data.
Description
Technical field
The present invention relates to mobile communication base station system, particularly a kind of mobile communication base station system and backpu protecting method thereof.
Background technology
Common public radio interface (Common Public Radio Interface is called for short " CPRI ") is the standard of being published by the many companies of industry cooperation about mobile communication wireless electricity inside of base station key interface.The CPRI standard is industry first public standard about this key interface, and the universal standard of the crucial internal interface in a cover base station is provided.
The cooperation of CPRI industry is absorbed in one about the third generation (3rd Generation, abbreviation " 3G ") design of base stations in mobile communication system, this design is divided into radio part and a control section to radio base station by specifying a new interface, this interface be inside of base station only and unique by wireless electrically driven (operated) interconnection point.This makes the various piece of base station can both be better benefit from the technological progress in field separately.
For whole wireless industry is benefited, the CPRI standard can obtain from the channel that is disclosed.For Virtual network operator, crucial benefit is can obtain abundanter radio base station product line and dispose planning with the shorter temporal adaptation of introducing to the market in all-network.The CPRI standard also makes base station manufacturer and parts suppliers can be absorbed in the relevant research and development activity of its core competitiveness simultaneously.The CPRI standard also can be used for new architecture, and is not subject to module measure or the division of predefined function.
The cooperation of CPRI industry can not only make base station manufacturer concentrate on energy in the research and development of core technology ability, and can realize the compatibility of the equipment that different vendor makes.The topmost benefit that this standard is brought is, allows the new technology that is introduced into be able to faster development, and makes base station manufacturer provide abundant more product line for operator, with the shorter time product invested market simultaneously.Simultaneously operator can benefit from also that product is more widely selected, the further raising of solution and network design efficient.
The original enterprise of CPRI is devoted to start emulative mobile network's parts industry with of one mind, and by open CPRI interface, whole wireless industry is benefited.CPRI will be to existing standardization body, as 3G (Third Generation) Moblie partner program (3rd Generation Partnership Project, be called for short " 3GPP ") play supplementary function, the general-purpose interface of its exploitation will be applied in the wireless base station product of mobile system.
For the 3G mobile communication system, such as Wideband Code Division Multiple Access (WCDMA) (Wideband Code DivisionMultiple Access, be called for short " WCDMA "), the CPRI standard is used to realize first and second layer (L1, the L2) communication protocol between baseband control unit and the radio frequency unit.Based on the CPRI standard, can improve the versatility of interface between Base Band Unit and the radio frequency unit, also help realizing between the base band of different vendor and the radio-frequency module interconnected.
The signal packet that transmits between base band and the radio frequency in the CPRI interface contains data and signaling.Wherein data comprise up (radio frequency is to base band), descending (base band is to radio frequency) two paths of signals, every road signal is owing to be complex signal, be divided into homophase (In-Phase again, be called for short " I ") and quadrature (Quarduture, abbreviation " Q ") two mutually orthogonal components, therefore being commonly referred to the IQ signal, is exactly the IQ data flow in real system.The IQ data just, are modulated preceding data behind the coding that data after the radiofrequency signal demodulation that receives on the up direction before the decoding and down direction send with respect to the base station.The signaling that interface between base band and the radio frequency transmits is that baseband control unit is carried out operation and maintenance (Operations﹠amp to radio frequency unit; Maintenance is called for short " O﹠amp; M ") signaling, also promptly corresponding to High level data link control passage (High-level Data Link Control is called for short " HDLC ").
After CPRI successfully releases, how the system configuration and the networking mode of retrofit 3G wireless base station are the current problems that presses for solution, for a general base band and the interface between the radio frequency, need to propose corresponding system configuration that can make full use of its advantage and networking mode.Simultaneously on this system construction, also to provide Network Transmission reliability solution, under the general-purpose interface framework, under a plurality of different vendors manufacturing equipment collaboration situation, can guarantee globality, compatibility and the reliability of base station system.
The annular networking mode that at present relatively more good is between baseband control unit and the radio frequency unit can make full use of the versatility of CPRI interface by annular networking, makes networking, maintenance etc. become convenient.In a looped network, at least two passes to be arranged, one be from the base band to the radio frequency down going channel, another is the data feedback channel from the radio frequency to the base band.According to CPRI regulation, each radio frequency unit extracts the downlink data block of self from down going channel, continues then remaining data are passed backward, and the while also is added on the back with self uplink data block and continues to pass backward again in data feedback channel.
Because the time-delay that same radio frequency unit process up-downgoing passage arrives baseband control unit in the ring network is not quite similar, this has produced certain influence to the IQ data in addition.Therefore CPRI also provides by the baseband control unit method of proofreading and correct of delaying time and has made that the up-downgoing time-delay of IQ data is identical.
In actual applications, there is following problem in such scheme: because this scheme does not provide corresponding backup protection scheme, this has a strong impact on the transmission reliability between base band and the radio frequency.Such as the ring network for a single fiber bi-directional, two passage just in time is the uplink and downlink passage, does not have unnecessary backup protection passage.In case link occurs fault will cause serious consequences such as communication disruption.
Cause the main cause of this situation to be, the prior art scheme does not have the backup protection of realization to communication link, seriously reduces the transmission reliability between base band and the radio frequency unit.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of mobile communication base station system and backpu protecting method thereof, makes based on can reliable transmission between baseband control unit and the radio frequency unit in the mobile communication base station system of CPRI interface.
For achieving the above object, the invention provides a kind of mobile communication base station system, comprise baseband control unit and at least one radio frequency unit, wherein,
Described baseband control unit is used to handle baseband signal, finish data and Signalling exchange with described radio frequency unit;
Described radio frequency unit is used to handle radiofrequency signal, realizes air interface communication under described baseband control unit control;
Described baseband control unit and described radio frequency unit are by the networking of single fiber ring network;
Described single fiber ring network comprises two passages of different directions, is used to realize the backup protection to the up-downgoing passage between described baseband control unit and the described radio frequency unit.
Wherein, described baseband control unit all sends to the downlink data block of each described radio frequency unit successively at described two optical channels, and from described two optical channels selective reception from the uplink data block of each described radio frequency unit;
The downlink data block of described radio frequency unit selective reception self from described two optical channels, the uplink data block of self is all added in the position of correspondence self downlink data block in described two optical channels then, and continues to pass in this passage backward.
In this external described system, described baseband control unit is multiplexing on identical described optical channel by different subchannels with in-phase component data, quadrature component data and operation and maintenance signaling between the described radio frequency unit;
Wherein, described in-phase component data, the quadrature component data of each described radio frequency unit all independently take described subchannel, and the described operation and maintenance signaling of all described radio frequency units is shared described subchannel.
In this external described system, described radio frequency unit obtains the descending in-phase component, quadrature component data block of self from the described subchannel of the correspondence self of described two optical channels after, in this subchannel, add self up in-phase component, quadrature component data block, and continue in this passage, to pass backward.
In this external described system, described radio frequency unit extracts the downstream operation of self and safeguards signaling from the corresponding described subchannel of described two optical channels after, in this subchannel, insert the upstream operation of self and safeguard signaling, and continue in this passage, to pass backward.
In this external described system, described baseband control unit all carries out delay correction to described in-phase component data, the quadrature component data in described two optical channels, then described in-phase component data, the quadrature component data in one of them optical channel of selective reception.
In this external described system, described radio frequency unit is selected described in-phase component data, quadrature component data in one road optical channel wherein to carry out delay correction by the described baseband control unit of described operation and maintenance signaling and is received.
The present invention also provides a kind of mobile communication base station system backpu protecting method, comprises following steps:
The A baseband control unit all sends to the downlink data block of each radio frequency unit successively on two passages of single fiber looped network;
After the described radio frequency unit of B was selected to obtain the downlink data block of self from described two passages, the uplink data block of self was all added in the position of correspondence self downlink data block in described two passages, and continues to pass in this passage backward;
The described baseband control unit of C from described two passages selective reception from the described uplink data block of each described radio frequency unit.
Wherein, described baseband control unit is multiplexing on identical described optical channel by different subchannels with in-phase component data, quadrature component data and operation and maintenance signaling between the described radio frequency unit;
Wherein, described in-phase component data, the quadrature component data of each described radio frequency unit all independently take described subchannel, and the described operation and maintenance signaling of all described radio frequency units is shared described subchannel.
In this external described method, described step B comprises following substep,
Described radio frequency unit obtains descending in-phase component, the quadrature component data block of self from the described subchannel of the correspondence self of described two optical channels;
Described radio frequency unit adds up in-phase component, the quadrature component data block of self in this subchannel;
Described radio frequency unit continues this subchannel is passed in this passage backward.
In this external described method, described step B comprises following substep,
Described radio frequency unit extracts the downstream operation of self and safeguards signaling from the corresponding described subchannel of described two optical channels;
Described radio frequency unit inserts the upstream operation of self and safeguards signaling in this subchannel;
Described radio frequency unit continues this subchannel is passed in this passage backward.
In this external described method, described step C comprises following substep,
Described baseband control unit all carries out delay correction to described in-phase component data, the quadrature component data in described two optical channels;
Described then baseband control unit is according to described in-phase component data, quadrature component data in one of them optical channel of communication quality contrast selective reception.
In this external described method, described step C comprises following substep,
Described radio frequency unit is by wherein one road optical channel of the current correct transmission of the described baseband control unit of described operation and maintenance signaling;
Described baseband control unit is selected this optical channel, and wherein described in-phase component data, the quadrature component data back that carries out delay correction is received.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, adopt the single fiber annular networking to realize transmission of CPRI interface and backup, baseband control unit all transmits downlink data at the passage of two different directions, each radio frequency unit node is behind the downlink data of this node of intercepting on two passages, on the position of former downlink data, add the upstream data that this node is issued baseband control unit, and then continue to pass backward, up to baseband control unit, thereby realization is to the backup protection of up-downgoing data channel;
Baseband control unit or radio frequency unit selective reception one road data preferably wherein in the two paths of data of backup protection, baseband control unit also is responsible for the IQ data are carried out delay correction;
Baseband control unit all carries out delay correction to two paths of data simultaneously, and selective reception wherein a tunnel; Perhaps, pass through O﹠amp by radio frequency unit; The selective reception of M signaling baseband control unit is which data, and only this circuit-switched data carried out delay correction.
Difference on this technical scheme has brought comparatively significantly beneficial effect, promptly passes through the realization of the backup protection of single fiber looped network, improves the transmission reliability between baseband control unit and the radio frequency unit greatly, thereby improves the reliability of whole base station system; By the time delay adjustment of base band to the IQ data, improve professional service quality, reduce the influence time of link failure simultaneously to business.
Description of drawings
Fig. 1 is the mobile communication base station system networking schematic diagram based on the CPRI standard of first embodiment of the invention;
Fig. 2 be second embodiment of the invention handle the schematic diagram of IQ data backup link based on the mobile communication base station system radio frequency unit of CPRI standard;
Fig. 3 is the mobile communication base station system backpu protecting method flow chart based on the CPRI standard according to the 3rd execution mode of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Based on the CPRI standard, the present invention adopts baseband control unit and the radio frequency unit networking of single fiber looped network to mobile communication base station system.Two-way IQ data and O﹠amp between base band and the radio frequency; The M signaling is carried on the common physical link simultaneously according to the CPRI agreement, and is multiplexing by different subchannels.Send downlink data block simultaneously by the bi-directional light passage, and download downlink data, and fill uplink data block in situ, send back baseband control unit, thereby realize backup protection at the node of each radio frequency unit.
All monopolize antenna container (AntennaContainer is called for short " AxC ") subchannel according to each radio-frequency module IQ data of CPRI standard, and the O﹠amp of all radio frequency units; The M signaling is but shared a subchannel.Such multiplex mode also makes IQ and O﹠amp; The back mechanism of M is different, and wherein each radio frequency unit only needs the IQ data of whole AxC container are downloaded and displacement, and O﹠amp; The M signaling then needs to extract the signaling of self and replace it from same subchannel or CPRI frame data.
Each radio frequency unit arrives the time delay difference of baseband control unit, wherein O﹠amp in the communication data stream of two-way optical channel; The M signaling is not high so do not relate to delay problem to delay requirement, can easily realize Hot Spare, but the IQ data relates to delay problem, need carry out delay correction.The invention provides two kinds of methods and realize that time delay adjustment to the IQ data, wherein a kind of method are baseband control unit two paths of data is all proofreaied and correct wherein one tunnel correct signal of selective reception then; Another kind method is to pass through O﹠amp by radio frequency unit; The selective reception of M notice baseband control unit is which signal, and baseband control unit carries out delay correction to this road signal and receives.
In order more clearly to describe principle of the present invention, the ins and outs of the specific implementation in a plurality of execution mode of the present invention have been provided below.Fig. 1 is the base station system networking schematic diagram based on the CPRI standard of first execution mode of the present invention.
This system comprises a baseband control unit and a plurality of radio frequency unit.Baseband control unit is used to handle baseband signal, finish data and Signalling exchange with radio frequency unit, and the control radio frequency unit carries out the radio communication with travelling carriage.Radio frequency unit is used to handle radiofrequency signal, realizes the air interface communication of sub-district under baseband control unit control.Communication all meets the CPRI standard between baseband control unit and the radio frequency unit, even therefore a plurality of radio frequency units are diverse or even are made by different vendor, as long as it provides CPRI interface, just can work on this annular networking.Promptly encircling head from the top port of baseband control unit is connected by the single fiber ring network with N radio frequency unit successively.
In this single fiber ring network, each node promptly by forward or clockwise optical channel send to downstream node from the upstream node received signal, also by reverse or counterclockwise optical channel from the downstream node received signal and send to upstream node.Therefore this single fiber ring network comprises two optical channels of different directions, and first execution mode of the present invention promptly utilizes the backup protection of this single-fiber bidirectional looped realization to the up-downgoing passage between baseband control unit and the radio frequency unit.
As follows by the single-fiber bidirectional looped main thought that backs up: baseband control unit all sends to the downlink data block of each radio frequency unit successively at two optical channels, and from two optical channels selective reception from the uplink data block of each radio frequency unit; Radio frequency unit obtains the downlink data block of self from two optical channels after, add the uplink data block of self in the position of this downlink data block, and continue in this passage, to pass backward.
As seen the present invention utilizes the key point of single-fiber bidirectional looped realization backup to be: each circuit-switched data is not only finished the purpose with the downlink data block movement when each radio frequency unit is sent and arrived to baseband control unit, also through after each radio frequency unit, finished the uplink data block that this radio frequency unit is put into and brought back to baseband control unit simultaneously.Therefore the two-way ring of light of different directions has not only been finished the up-downgoing passage, and has realized mutual backup protection.
Yet according to the CPRI standard, for IQ data flow from the base band to the frequency band and the O﹠amp from the control unit to the radio frequency unit; These two kinds of different data of M signaling are to adopt different multiplex modes to be implemented in multiplexing on the same physical link.Because O﹠amp; The data volume of M signaling is less relatively, so the O﹠amp of all radio frequency units; The M signaling only need be shared the bandwidth of CPRI agreement, and the IQ data are each radio frequency unit bandwidth of monopolizing an AxC container then.
Thus for IQ data and O﹠amp; The backup protection mechanism of M signaling is some difference also, and second execution mode of the present invention is on the basis of first execution mode, respectively to IQ data and O﹠amp; The M signaling is carried out backup protection.Each node is for IQ data and O﹠amp; The M data processing is different.
Wherein, radio frequency unit obtains the descending IQ data block of self from the AxC container of the correspondence self of two optical channels after, in this AxC container, add the up IQ data block of self, and continue in this passage, to pass backward for the IQ data flow.Promptly from the reception (Receive of a port, abbreviation " R ") passage receives the downlink data of self, then up IQ data are inserted into the identical AxC passage that uses with descending IQ data then at the transmission (Transmit of another one port, be called for short " T ") passage sends, thereby to bandwidth without any influence.
And for O﹠amp; M signaling, radio frequency unit are then extracted the descending O﹠amp of self from the correspondence of two optical channels transmits the signaling of all radio frequency units the subchannel of signaling; The M signaling is inserted the Shang HangO ﹠amp of self then in this subchannel; The M signaling, and continue in this passage, to pass backward.According to the CPRI agreement, all radio frequency units can only be shared the bandwidth of arranging in the CPRI agreement, so the O﹠amp of all radio frequency units; M is packaged in together.Through after the processing of intermediate node, to the O﹠amp of a CPRI frame; The M data may comprise the descending O﹠amp in part unit; The Shang HangO ﹠amp of M data and part unit; The M data.
Fig. 2 shows the schematic diagram of each radio frequency unit processing IQ data backup second embodiment of the invention.The radio frequency unit of each node sends at two CRPI ports the data of self issuing baseband control unit simultaneously.For the IQ data, can be according to the bigger fixing up-downgoing AxC container path that distributes equal number for each radio frequency unit of up-downlink direction data volume.The descending IQ data of receiving this radio frequency unit are identical, are the time delay difference, and radio frequency unit can be selected one tunnel good receiving arbitrarily; To up IQ data, radio frequency unit sends at two ports simultaneously, is received from two tops and terminal prot by baseband control unit.
O﹠amp to the HDLC link; The M signaling, the O﹠amp of each radio frequency unit from receiving; Take out the data of oneself in the M data, data and the remaining data of then oneself being issued baseband control unit issue according to original data flow together, and radio frequency unit need guarantee each O﹠amp of oneself; The M packet sends to the port of both direction, and baseband control unit receives respectively from two ports that link to each other with radio frequency unit, selects wherein one the tunnel for use, no matter selects which baseband control unit can receive the O﹠amp that any one radio frequency unit is sent; The M data, just time delay may be different, but O﹠amp; The M data do not require time delay, and therefore the data of selecting which road to send all are that correct data can guarantee the communication between baseband control unit and the radio frequency unit.
As previously mentioned, because the IQ data are relatively stricter for delay requirement, therefore need provide corresponding time delay adjustment scheme.In the WCDMA system, the transmitting-receiving of rf data and processing are very strict to the requirement of time delay, and in order to compensate the data delay of base band to radio-frequency transmissions point, baseband processing unit need carry out the time delay lead to the IQ data to be handled.In order to guarantee that base band arrives the accuracy of radio frequency unit time delay, mutually redundant two-way IQ passage all needs the calculating time delay amount, because the node number of path length between from the base band to the radio frequency unit and middle process may be different.
In fact, provide method in the CPRI standard for the IQ time delay adjustment.But under the mutually redundant two paths of signals of single fiber looped network, need provide the time delay adjustment strategy, make to guarantee that time delay adjustment accurately realizes, and do not influence the backup protection performance, promptly link failure can not exert an influence to quality of service.The present invention according to the time elongatedness and transmit the different of reliability requirement and provide two kinds of IQ data to realize correcting schemes.
First kind of IQ time delay adjustment strategy is: baseband control unit all carries out delay correction to the IQ data in two optical channels, then selective reception one of them transmit IQ data in the normal optical channel.In the enough situations of downgoing baseband disposal ability, base band can be calculated the time delay from top port and terminal prot to radio frequency unit simultaneously, concrete computational methods can be with reference to the CPRI standard, identical two paths of data is carried out the time delay lead according to different retardations respectively handle, send to corresponding ports then.No matter radio frequency unit receives data from which port, and the time delay of its data all is correct.The advantage of this scheme is simple, but the prerequisite base band will have enough disposal abilities, can handle the delay compensation of two paths of data simultaneously.Under the not enough situation of disposal ability, because unnecessary amount of calculation can increase processing delay on the contrary.Therefore provide the scheme of second kind of compromise.
Second kind of IQ time delay adjustment strategy is: radio frequency unit passes through O﹠amp; IQ data in the M signaling baseband control unit selection optical channel that wherein one tunnel transmission is correct carry out delay correction and receive.Radio frequency unit is according to link circuit condition, at first selects one road data preferably, passes through O﹠amp then; The link of M passage notice baseband processing unit its selection at present, Base-Band Processing only carries out delay correction to a circuit-switched data of its selection according to the radio frequency unit notice.This scheme does not have extra requirement to the disposal ability of base band, but during the channel failure of current selection, professional can of short duration losing, this time is very short, because O﹠amp; The M data are Hot Spare all the time, and radio frequency unit can in time be notified baseband processing unit before switching.
Scheme provided by the invention has improved the reliability that adopts the CPRI agreement to carry out the networking of single fiber bi-directional annular, is guaranteeing to have realized backup protection under the prerequisite that time delay adjustment is finished, avoid or when having shortened link failure to the influence of business.
Those of ordinary skill in the art are appreciated that, in the statement of above-mentioned execution mode for some concrete ins and outs of 3G system all according to the WCDMA standard to describe, mobile communication system for other 3G or back 3G, only need to operate according to respective standard, can realize goal of the invention in the same old way, and not influence the spirit and scope of the invention.
With reference to mobile communication base station system and networking mode and back mechanism based on the CPRI standard recited above, Fig. 3 has provided the mobile communication base station system backpu protecting method flow chart based on the CPRI standard of the 3rd execution mode of the present invention.
In step 301, baseband control unit all sends to the downlink data block of each radio frequency unit successively on two optical channels of single fiber looped network, and wherein the IQ data of each radio frequency unit are multiplexing by the AxC container of unified amount of bandwidth, and the O﹠amp of all radio frequency units; The M data are then multiplexing on the subchannel of same agreement bandwidth.
In step 302, from two optical channels, select to obtain the downlink data block of self for each radio frequency unit, only need the data in the whole AxC container are downloaded for the IQ data, and for O﹠amp; The M signaling then will will be extracted the O﹠amp of self in the signaling of all radio frequency units in the whole subchannel; The M signaling.
In step 303, radio frequency unit also need all add the uplink data block of self in the position of correspondence self downlink data block in two optical channels, and continues to pass in this passage backward.This step has just been realized the backup key to downlink data.As previously mentioned because IQ data and O﹠amp; M method for transmitting signaling difference also needs to carry out accordingly with step 302 when therefore adding downlink data.For the IQ data, radio frequency unit adds the up IQ data block of self in corresponding A xC container, and continues to pass in this passage backward.For O﹠amp; The M signaling is inserted self downlink signaling in the subchannel get back to after the up signaling of original extraction, and packing continues this subchannel is passed in this passage backward.
In step 304, baseband control unit from two optical channels selective reception from the uplink data block of each radio frequency unit.As previously mentioned, baseband control unit also needs wherein IQ data are carried out delay correction in this step, and two kinds of implementations are arranged:
Corresponding first kind of scheme, baseband control unit all carries out delay correction to the IQ data in two optical channels; Then according to the IQ data in one of them optical channel of communication quality contrast selective reception.
Corresponding second kind of scheme, radio frequency unit passes through O﹠amp; Wherein one road optical channel of the current correct transmission of M signaling baseband control unit; Baseband control unit is selected this optical channel, only wherein IQ data carried out delay correction, and with its reception.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (12)
1. a mobile communication base station system is characterized in that, comprises baseband control unit and at least one radio frequency unit, wherein,
Described baseband control unit is used to handle baseband signal, finish data and Signalling exchange with described radio frequency unit;
Described radio frequency unit is used to handle radiofrequency signal, realizes air interface communication under described baseband control unit control;
Described baseband control unit and described radio frequency unit are by the networking of single fiber ring network; Described single fiber ring network comprises two passages of different directions;
Described baseband control unit all sends to the downlink data block of each described radio frequency unit successively at described two passages, and from described two passages selective reception from the uplink data block of each described radio frequency unit;
The downlink data block of described radio frequency unit selective reception self from described two passages, the uplink data block of self is all added in the position of correspondence self downlink data block in described two passages then, and continues to pass in this passage backward.
2. mobile communication base station system according to claim 1 is characterized in that,
Described two passages are two optical channels;
Described baseband control unit is multiplexing on identical described optical channel by different subchannels with in-phase component data, quadrature component data and operation and maintenance signaling between the described radio frequency unit;
Wherein, described in-phase component data, the quadrature component data of each described radio frequency unit all independently take described subchannel, and the described operation and maintenance signaling of all described radio frequency units is shared described subchannel.
3. mobile communication base station system according to claim 2, it is characterized in that, described radio frequency unit obtains the descending in-phase component, quadrature component data block of self from the described subchannel of the correspondence self of described two optical channels after, in this subchannel, add self up in-phase component, quadrature component data block, and continue in this passage, to pass backward.
4. mobile communication base station system according to claim 2, it is characterized in that, described radio frequency unit extracts the downstream operation of self and safeguards signaling from the corresponding described subchannel of described two optical channels after, in this subchannel, insert the upstream operation of self and safeguard signaling, and continue in this passage, to pass backward.
5. according to claim 3 or 4 described mobile communication base station systems, it is characterized in that, described baseband control unit all carries out delay correction to described in-phase component data, the quadrature component data in described two optical channels, then described in-phase component data, the quadrature component data in one of them optical channel of selective reception.
6. according to claim 3 or 4 described mobile communication base station systems, it is characterized in that described radio frequency unit is selected described in-phase component data, quadrature component data in one road optical channel wherein to carry out delay correction by the described baseband control unit of described operation and maintenance signaling and received.
7. a mobile communication base station system backpu protecting method is characterized in that, comprises following steps:
The A baseband control unit all sends to the downlink data block of each radio frequency unit successively on two passages of single fiber looped network;
After the described radio frequency unit of B was selected to obtain the downlink data block of self from described two passages, the uplink data block of self was all added in the position of correspondence self downlink data block in described two passages, and continues to pass in this passage backward;
The described baseband control unit of C from described two passages selective reception from the described uplink data block of each described radio frequency unit.
8. mobile communication base station system backpu protecting method according to claim 7, it is characterized in that described baseband control unit is multiplexing on identical described optical channel by different subchannels with in-phase component data, quadrature component data and operation and maintenance signaling between the described radio frequency unit;
Wherein, described in-phase component data, the quadrature component data of each described radio frequency unit all independently take described subchannel, and the described operation and maintenance signaling of all described radio frequency units is shared described subchannel.
9. mobile communication base station system backpu protecting method according to claim 8 is characterized in that described step B comprises following substep,
Described radio frequency unit obtains descending in-phase component, the quadrature component data block of self from the described subchannel of the correspondence self of described two optical channels;
Described radio frequency unit adds up in-phase component, the quadrature component data block of self in this subchannel;
Described radio frequency unit continues this subchannel is passed in this passage backward.
10. mobile communication base station system backpu protecting method according to claim 8 is characterized in that described step B comprises following substep,
Described radio frequency unit extracts the downstream operation of self and safeguards signaling from the corresponding described subchannel of described two optical channels;
Described radio frequency unit inserts the upstream operation of self and safeguards signaling in this subchannel;
Described radio frequency unit continues this subchannel is passed in this passage backward.
11. according to claim 9 or 10 described mobile communication base station system backpu protecting methods, it is characterized in that described step C comprises following substep,
Described baseband control unit all carries out delay correction to described in-phase component data, the quadrature component data in described two optical channels;
Described then baseband control unit is according to described in-phase component data, quadrature component data in one of them optical channel of communication quality contrast selective reception.
12. according to claim 9 or 10 described mobile communication base station system backpu protecting methods, it is characterized in that described step C comprises following substep,
Described radio frequency unit is by wherein one road optical channel of the current correct transmission of the described baseband control unit of described operation and maintenance signaling;
Described baseband control unit is selected this optical channel, and wherein described in-phase component data, the quadrature component data back that carries out delay correction is received.
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| CN101771591B (en) * | 2008-12-26 | 2011-09-28 | 大唐移动通信设备有限公司 | Service transmission method and system under RRU and BBU loop network |
| CN102316499A (en) * | 2010-07-07 | 2012-01-11 | 中兴通讯股份有限公司 | Method and system for transmitting data by ring networking |
| CN113259082B (en) * | 2021-06-08 | 2021-11-30 | 中汽创智科技有限公司 | Heterogeneous sensor synchronization method and device, vehicle and storage medium |
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