CN100341292C - Distributed substation network combining method - Google Patents
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- CN100341292C CN100341292C CNB2004100004776A CN200410000477A CN100341292C CN 100341292 C CN100341292 C CN 100341292C CN B2004100004776 A CNB2004100004776 A CN B2004100004776A CN 200410000477 A CN200410000477 A CN 200410000477A CN 100341292 C CN100341292 C CN 100341292C
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Abstract
The present invention discloses a network combing method of distributed base stations. In the method, two or more optical ports are arranged on a baseband part and radio frequency parts in a distributed base station; the baseband part and the radio frequency parts are connected in series to form a loop network; after the radio frequency parts are started, an optical fiber link is monitored; after the baseband part is started, a section of optical fiber is arranged in the loop network as spare optical fiber, and main and spare properties of the optical fiber and upper properties and lower properties of the radio frequency parts are added in interface information; the baseband part transmits the interface information to all the serial radio frequency parts step by step to inform the main and the spare properties of all the radio frequency parts; one radio frequency part transmits interface information to the next radio frequency part to indicate the identity; a radio frequency part obtains the main and the spare properties of the optical fiber link and the upper properties and the lower properties of the radio frequency part from the baseband part or interface information transmitted from the upper radio frequency part. After the present invention is used, chain or loop networks can be realized, transmission resources are saved, and the reliability of the whole system is enhanced.
Description
Technical field
The present invention relates to the base station in the wireless communication system, particularly a kind of network-building method of distributed base station.
Background technology
In the distributed base station of wireless communication system, a baseband portion (REC) can be controlled a plurality of radio frequency part (RE).At present, do not consider the situation of cascade in the interface standard of baseband portion and radio frequency part (CPRI) standard as yet, therefore, chain, tree-like, annular all can't be supported, if a REC will be with a plurality of RE, can only adopt Y-connection.
Referring to Fig. 1, Fig. 1 is a distributed base station star net forming schematic diagram in the prior art.A REC links to each other respectively with RE1, RE2, three RE of RE3 among Fig. 1, and under the situation of this Y-connection, REC draws a pair of optical fiber separately for each RE, and REC provides a light mouth for each RE simultaneously.Under some occasion, star net forming is more serious to the waste of transfer resource.For example, when on highway, REC, RE may be in-line and arrange, suppose between REC and first RE at a distance of 5Km, be 5Km also apart between per two RE, if the employing communication link protection, the optical fiber that can connect a pair of 5Km from REC connects the light of a pair of 5Km to second level RE2 from first order RE1 again to first order RE1.But when star net forming, the optical fiber that can only draw 5Km and 10Km respectively from REC has been used the optical fiber of 5Km than communication link protection more, and has been taken the light mouth of REC more to RE1 and RE2.This is very uneconomic when a big capacity REC is with a lot of low capacity RE.
So, how to adopt the mode of cascade to realize chain, annular networking, reducing transmission resource waste is urgent problem in the present distributed base station technology.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of network-building method of distributed base station, radio frequency part level in the distributed base station can be linked up, and reduces the waste of transfer resource, reduces networking cost.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of network-building method of distributed base station, this method may further comprise the steps:
1) for the baseband portion in the distributed base station and each radio frequency part two or more light mouths is set respectively;
2) use the optical fiber cascade to circularize net by the described light mouth of step 1) baseband portion in the distributed base station and radio frequency part;
3) after radio frequency part starts, monitor the interface message of transmitting on the coupled optical fiber;
4) after baseband portion started, the one section optical fiber that is provided with in the ring network was standby optical fiber, and the superior and the subordinate's attribute of the radio frequency part that the active and standby attribute of increase optical fiber is connected with this optical fiber in interface message;
5) baseband portion each radio frequency part by cascade is step by step to each radio frequency part transmission interface information, notify each radio frequency part its connect the active and standby attribute of optical fiber; Radio frequency part indicates oneself and is higher level's radio frequency part in the interface message that sends to the next stage radio frequency part;
6) after radio frequency part listens to the interface message of transmitting on the coupled optical fiber, from the interface message of baseband portion or the transmission of higher level's radio frequency part, obtain the active and standby attribute of this optical fiber link and the superior and the subordinate's attribute of this radio frequency part.
Wherein, on the coupled optical fiber of the described monitoring of step 3) the method for transmission interface message can for: radio frequency part is to baseband portion that is adjacent or radio frequency part transmission interface information, notify described baseband portion or the unknown of radio frequency part optical fiber attributes, wait for that this baseband portion or radio frequency part return the superior and the subordinate's attribute of the active and standby attribute of optical fiber and this baseband portion or radio frequency part.
When known its of radio frequency part is the subordinate of adjacent baseband portion or radio frequency part, can be to this baseband portion or radio frequency part transmission interface information, notify this baseband portion or the unknown of radio frequency part optical fiber attributes, wait for that this baseband portion or radio frequency part return the active and standby attribute of optical fiber.
This method may further include: when radio frequency part and baseband portion were out of touch, radio frequency part was monitored the interface message of transmitting on the coupled optical fiber again.
When this method was applied to the interface standard CPRI interface of baseband portion and radio frequency part, the active and standby attribute of described optical fiber can be multiplexing with original Service Access point faulty indication SDI bit in the interface message.
Described step 5) to step 6) comprises the ring network start-up course, and this process may further comprise the steps:
A, start baseband portion, baseband portion is learnt according to configuration information and the structure of whole ring is determined that then which section optical fiber is standby optical fiber;
All radio frequency part of B, baseband portion and the first order obtain mutually respectively synchronously;
C, baseband portion use HDLC link or Ethernet to send the Operation and Maintenance information that has comprised interface message respectively to all radio frequency part of the first order, the active and standby attribute of all radio frequency part optical fiber of the notice first order;
The radio frequency part of D, the corresponding levels and all radio frequency part of next stage obtain mutually respectively synchronously; And indicate this radio frequency part for the higher level;
E, baseband portion are set up with all radio frequency part of next stage step by step and are got in touch;
F, baseband portion use HDLC link or Ethernet to send the Operation and Maintenance information that has comprised interface message respectively to all radio frequency part of next stage step by step, the active and standby attribute of all radio frequency part optical fiber of notice next stage;
If G also has next stage radio frequency part, then repeated execution of steps D-G; Otherwise start-up course is finished.
Baseband portion can be learnt the structure of whole ring according to the system configuration information of the hardware annexation between each radio frequency part, each radio frequency part in the steps A, and determines which section to be standby optical fiber.
Synchronizing process among the step B between baseband portion and radio frequency part can for both sides from starting the process that the back can proper communication to mutually, comprise rate adapted, clock synchronization, interface format checking procedure at least.
The process of the described foundation of step e contact can for: baseband portion sends to first order radio frequency part and sets up baseband portion to the Operation and Maintenance information of getting in touch between the target radio frequency part, after first order radio frequency part is received this information, judge this information according to wherein HDLC address or IP address and whether send to oneself, if not, then this information is passed through next stage, next stage passes through next stage more in the same way, up to the target radio frequency part, target radio frequency is promptly set up contact after partly receiving this information.
Step F is described notify step by step optical fiber active and standby attribute process can for: baseband portion sends the active and standby property operations maintenance information of notification target radio frequency part optical fiber to first order radio frequency part, after first order radio frequency part is received this information, judge according to wherein HDLC address or IP address whether this information sends to oneself, if not, then this information is passed through next stage, next stage passes through next stage more in the same way, up to the target radio frequency part.
This method may further include the business datum repeating process, and this process comprises:
A, baseband portion are carrying out determining good each radio frequency part business datum position in interface frame earlier before business datum transmits, and with the position of business datum in interface frame by high-level signaling by each radio frequency part of baseband portion dispensing; Each radio frequency part writes down this position;
When B, radio frequency part are received the business datum that the higher level sends,, read the business datum of this position according to the position of this radio frequency part business datum in interface frame of record; Return business datum to the higher level if desired, then the business datum that will return is filled into the position in the above-mentioned interface frame, returns to the higher level; For the business datum of non-radio frequency part in the interface frame, then pass through next stage or the transparent upper level that returns to.
This method can further include time-delay measuring method, it is: self is measured and write down to baseband portion to the propagation delay time of next stage radio frequency part and the processing delay of self, radio frequency part is measured this equipment to the propagation delay time of next stage equipment, and and self processing delay report baseband portion together; Baseband portion is according to network configuration, and the uplink time delay that each radio frequency part is reported adds up, and adds this baseband portion and obtains total uplink time delay to the uplink time delay of next stage radio frequency part and the processing delay of this baseband portion; With the descending time delay that each radio frequency part reports, add this baseband portion and add up to the processing delay of the downlink transfer time delay of next stage radio frequency part and this baseband portion and obtain total descending time delay.
This method can further include the link failure processing procedure, and this process may further comprise the steps:
A, radio frequency part are given baseband portion the report information that the link to the next stage radio frequency part breaks down, and behind the baseband portion analysis of failure, determine to need to activate standby optical fiber;
The radio frequency part of B, baseband portion notice report fault changes the optical fiber that link failure occurs over to standby attitude;
The radio frequency part that C, baseband portion notice link to each other with former standby optical fiber changes this section optical fiber over to the main attitude of using;
The radio frequency part of the other end of described radio frequency part of D, step C and link failure obtains synchronously, and baseband portion and this radio frequency part are set up and got in touch then; The optical fiber that baseband portion notifies this radio frequency part link failure will occur changes standby attitude over to;
E, baseband portion redistribute bandwidth newly changing on the main optical fiber with attitude.
This method can further include the radio frequency part fault treating procedure, and this process may further comprise the steps:
A, baseband portion are analyzed fault, determine which radio frequency part breaks down;
B, baseband portion change former standby optical fiber over to the main attitude of using;
C, change main radio frequency part with attitude optical fiber two ends over to and obtain synchronously, baseband portion is got in touch with the radio frequency part that links to each other with the fault radio frequency part then; Baseband portion notifies this radio frequency part to change the optical fiber that its other end links to each other with the fault radio frequency part over to standby attitude;
D, baseband portion redistribute bandwidth newly changing on the main optical fiber with attitude.
As seen from the above technical solutions, the network-building method of this distributed base station of the present invention, for the baseband portion in the distributed base station and each radio frequency part are provided with two or more light mouths respectively, and use the optical fiber cascade to circularize net by described light mouth the baseband portion in the distributed base station and the radio frequency part, radio frequency part level in the distributed base station can be linked up, reduce the waste of transfer resource, reduce networking cost.
Description of drawings
Fig. 1 is a distributed base station star net forming schematic diagram in the prior art;
Fig. 2 is the distributed base station annular networking schematic diagram of the present invention's first preferred embodiment;
Fig. 3 is for carrying out the principle schematic of uplink and downlink latency measurement in embodiment illustrated in fig. 2;
Fig. 4 is the link topological diagram after link failure embodiment illustrated in fig. 2 is handled;
Fig. 5 is the link topological diagram after the RE troubleshooting embodiment illustrated in fig. 2;
Fig. 6 is the distributed base station annular networking schematic diagram of the present invention's second preferred embodiment.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The network-building method of this distributed base station of the present invention, for the baseband portion in the distributed base station and each radio frequency part are provided with two or more light mouths respectively, and use the optical fiber cascade to circularize net by above-mentioned light mouth the baseband portion in the distributed base station and radio frequency part.
Use the inventive method and can realize chain, annular networking.Referring to Fig. 2, Fig. 2 is the distributed base station annular networking schematic diagram of the present invention's first preferred embodiment.Wherein, REC and each RE provide two pairs of light mouths.REC links to each other with RE4, RE1 respectively by two pairs of optical fiber; RE1 links to each other with RE2 to optical fiber by another; RE2 links to each other with RE3 to optical fiber by another; RE3 links to each other with RE4 to optical fiber by another.
Like this, in the ring of forming by a REC and N RE, always total N+1 section optical fiber.Wherein, it is that what service to be provided is the main optical fiber of use that N section optical fiber is arranged, and remaining one section then is used for standbyly, determines to allow which section optical fiber be in standby attitude by REC.For any one RE in the ring, its uplink and downlink path is opposite.Solid line represents that the main optical fiber, its transmitting-receiving two-end used carries out normal professional transmitting-receiving among Fig. 2.Dotted line is represented standby optical fiber, does not pass business on it, only is used between two RE the control information of sending out basic mutually, and whether being used for both sides, to detect link normal.That is to say that RE2 is standby optical fiber to the optical fiber between the RE3, other REC are the main optical fiber of using to the optical fiber between RE and the RE.
Though in physical layer, REC and RE have formed a ring, be standby owing to always one section optical fiber is arranged, therefore, concerning business, topological structure is one or two chains.As seen, the networking that standby optical fiber is not set is exactly a chain net, and communication link protection can be looked and be a kind of of annular networking, does not just use standby optical fiber.
In the enforcement shown in Figure 2, REC has had four RE under its command, concerning business, has formed two chains of REC-RE1-RE2 and REC-RE4-RE3.
Under the situation of looped network, the relationship between superior and subordinate between the adjacent R E is uncertain, need indicate in interface message.Need the activestandby state that also comprises link that indicates simultaneously.Therefore, the present invention has increased be used to indicate the superior and the subordinate and active and standby usefulness active and standby and has used control information in interface message, and to every pair of optical fiber of REC or RE, what all be provided with two base attributes comprising as shown in Table 1 active and standbyly uses control information:
| Attribute | Explanation |
| The active and standby attribute of using | Represent that this optical fiber is main usefulness or standby |
| The superior and the subordinate | Represent that this RE is higher level or subordinate on this optical fiber |
Table one
These two base attributes are all only effective in current interval, that is to say comprise in the interface message that RE receives active and standby with control information only to it self useful, when it is transmitted toward next stage RE, then fill in this two base attributes active and standby in control information again according to actual conditions.Specific to CPRI, comprise the active and standby of above-mentioned two base attributes with control information can (SAP Defect Indication, SDI) bit be multiplexing with Service Access point faulty indication bit.This SDI bit is the optical fiber level, is not under the jurisdiction of Operation and Maintenance or business datum, indication be the state of whole piece optical fiber.Interface message as herein described refers to all information on the optical fiber, and information such as Operation and Maintenance and business datum are played transmission together in interface frame according to certain frame format.Described herein higher level, the RE of subordinate: be meant in a cascade chain, among two adjacent RE, be called the higher level, be called subordinate away from the side of REC near the side of REC.Up, descending: from REC toward the direction of RE, perhaps the direction from higher level RE to the RE of subordinate be called descending, otherwise then be up.
Under the situation of prior art star net forming, can use High-level Data Link Control (HDLC) link or Ethernet to come transmission information.So, when cascade, also can use HDLC link or Ethernet to come passing interface information, wherein, OM channel (OM) is shared for all RE, discerns different RE by HDLC address or IP address.
After physically ring network being set up, can start RE earlier.
When RE started, the attribute of all light mouths did not know also that all RE begins monitored link.RE at first attempts receiving the interface message that send the opposite end when listening state, judge that by the interface message of receiving the optical fiber that links to each other with the opposite end is to lead with attitude or standby attitude and oneself is higher level or subordinate on this section optical fiber.
Certainly, the RE of listening state also can at first attempt to opposite end transmission interface information, and the unknown of notice opposite equip. optical fiber attributes waits for that opposite equip. returns the active and standby attribute of optical fiber and the superior and the subordinate's attribute of opposite equip..But send then is that optionally it can not send.
If knowing the opposite end is the higher level, when for example the opposite end was REC, RE also can be to REC transmission interface information, notice opposite end optical fiber attributes the unknown in transmission information, and indication is certainly as subordinate.
If the opposite end is subordinate or optical fiber is standby optical fiber, then only need to keep monitoring.
After successfully detecting the main higher level of using optical fiber, RE just can receive the Operation and Maintenance information of REC, if REC notice RE also needs the cascade next stage, then indicating in the Operation and Maintenance information that corresponding optical fiber sends oneself is the higher level.
A RE has and only has a pair of master to use higher level's optical fiber, and when this fiber failure, RE and REC are out of touch, and RE is monitored link again.
RE can start the full annular net after starting.Flow process when ring network normally starts in the present embodiment may further comprise the steps:
Step 1: start REC, learn according to configuration information the structure of whole ring to determine that then which section optical fiber is standby, in the present embodiment, standby optical fiber is between RE2 and RE3.As REC and RE all after the installation, generally speaking, have the configuration information of the in store necessity of configuration file in the system, but its specific implementation can have nothing in common with each other.This step mainly is to learn the structure of whole ring according to the information such as system configuration of the hardware annexation between each RE, each RE, and determines which section for standby optical fiber.
Step 2:REC and RE1, RE4 obtain mutually respectively synchronously.Synchronizing process between REC and RE is meant that both sides from starting the process that the back can proper communication to mutually, generally comprise rate adapted, clock synchronization, interface format verification or the like step.At different wireless systems, its synchronizing process also is different.Synchronous process between REC and RE is same as the prior art, repeats no more here.
Step 3, REC use HDLC link or Ethernet to RE1, RE4 transmit operation maintenance information, and notice RE1:RE1 is that the next stage master uses optical fiber to the optical fiber between RE2; Notice RE4:RE4 is that the next stage master uses optical fiber to the optical fiber between RE3.
Step 4, RE1 and RE2 obtain mutually synchronously, and notice RE2:RE1 is the higher level; RE4 and RE2 obtain mutually synchronously, and notice RE3:RE4 is the higher level.Synchronizing process between synchronous and REC and RE between RE is identical, and difference only is that synchronous entity both sides are RE.
Step 5:REC sends to RE1 and sets up REC to the Operation and Maintenance information of getting in touch between the RE2, after RE 1 receives this information, judges this information according to wherein HDLC address or IP address and sends to RE2, then this information is passed through RE2; REC sends to RE4 and sets up REC to the Operation and Maintenance information of getting in touch between the RE2, after RE4 receives this information, judges this information according to wherein HDLC address or IP address and sends to RE3, then this information is passed through RE3 and sets up contact.
After step 6:REC and RE2 set up and get in touch, it is the Operation and Maintenance information of standby optical fiber to the next stage optical fiber between the RE3 that REC sends notice RE2 to RE1, after RE1 receives this information, judge this information according to wherein HDLC address or IP address and send to RE2, then this information is passed through RE2; After REC and RE3 set up and get in touch, it is the Operation and Maintenance information of standby optical fiber to the next stage optical fiber between the RE2 that REC sends notice RE3 to RE4, after RE4 receives this information, judge this information according to wherein HDLC address or IP address and send to RE3, then this information is passed through RE3.
Step 7:RE2 and RE3 obtain synchronously.Synchronous process is identical with step 4.
Like this, ring network has just normally started, and just can carry out business datum then and transmit.The method that the present embodiment business datum is transmitted and the difference of prior art data forwarding are to have increased following two steps:
Because the bandwidth of a pair of light is 1.25G or 2.5G normally, behind the 8B/10B coding, available bandwidth is about 1G or 2G, generally, it is needed that this bandwidth is far longer than single RE, so interface frame has comprised the business datum of all RE on this cascade chain in the present embodiment.Therefore, in the present embodiment, first step of increase is: REC is carrying out determining good each RE business datum position in interface frame earlier before business datum transmits, and with the position of business datum in interface frame by high-level signaling by each RE of REC dispensing.Each RE writes down this position.
Second step is: when RE receives the business datum that the higher level sends, according to the position of this RE business datum in interface frame of record, read the business datum of this position; Return business datum to the higher level if desired, then the business datum that will return is filled into the position in the above-mentioned interface frame, returns to the higher level.For the business information of other bits, then pass through next stage or the transparent upper level that returns to.In most wireless systems, WCDMA system for example, therefore the propagation delay time that REC needs to know RE need carry out latency measurement to make corresponding compensation.During the prior art star net forming, method of measurement is fairly simple, and its uplink and downlink time delay equates, is the mean value of REC inner time delay and RE inner time delay difference.The present invention also provides a kind of method of latency measurement.
Referring to Fig. 3, Fig. 3 is for carrying out the principle schematic of uplink and downlink latency measurement in embodiment illustrated in fig. 2.
REC is to the descending time delay T17=T13+T35+T57 of RE2, uplink time delay T82=T86+T64+T42.REC is responsible for the time delay between measure R EC and the RE1: T13=T42=(T12-T34)/2, and T12 is that the REC inner time delay can be recorded by REC, is the attribute of RE1 and T34 is the inner time delay of RE1, can report REC by high-level signaling.RE1 is responsible for the time delay between measure R E1 and the RE2: T57=T86=(T56-T78)/2, and in like manner, T56 can be recorded by RE1, and that T78 is RE2 is known.Like this, T57 that the RE1 handle records and T86 and the processing of self time-delay T35 and T64 report REC, and then REC just can calculate T17 and T82.
Like this, by the mode of measuring piecemeal and adding up, REC just can record the up-downgoing time delay of all RE.It should be noted that under the situation of cascade the time-delay of up-downgoing may be different, this be connected at point-to-point different.
Time-delay measuring method among the present invention can record the uplink and downlink time delay simultaneously, is respectively T82 and T17 in the present embodiment.The present invention is the same with prior art to the use of the time delay of measurement, and this paper repeats no more.
Because present embodiment is provided with standby optical fiber, so can handle some faults, has improved the reliability of system.
For example, the system of present embodiment is in running, and optical fiber between RE1 and the RE2 or light mouth have been broken, and then the process that this fault is handled may further comprise the steps:
Optical fiber between step 1:RE1 and the RE2 or light mouth fault, RE2 this moment and REC have lost contact.
Step 2:RE1 reports to REC to fault message, behind the REC analysis of failure, determines to activate the optical fiber between RE2 and the RE3.
Step 3:REC notice RE1 changes the optical fiber between RE1 and the RE2 over to standby attitude.
Step 4:REC notice RE3 changes the optical fiber between RE3 and the RE2 over to the main attitude of using.
Step 5:RE3 and RE2 obtain synchronously, and REC and RE2 get in touch then.
Step 6:REC notice RE2 changes the optical fiber between RE2 and the RE1 over to standby attitude.
Step 7:REC on optical fiber for RE2 redistributes bandwidth, and the notice RE2.
At this moment, though the optical fiber between RE2 and the RE1 is standby attitude, because link failure, so can not transmit basic control information on the optical fiber between actual RE2 and the RE1.This moment system the link topological diagram as shown in Figure 4, Fig. 4 be the link topological diagram after the link failure embodiment illustrated in fig. 2 processing.At this moment, ring has become two chain: REC-RE1 and two chains of REC-RE4-RE3-RE2.If after maintenance, the link-recovery between RE2 and the RE1 is normal, can transmit basic control information on the optical fiber between RE2 and the RE1.
In the present embodiment, when a node was the RE fault, the residue node can also operate as normal.For example fault has appearred in RE1 in the present embodiment.Its handling process may further comprise the steps:
Step 1:RE1 fault causes REC and RE1 out of touch, and RE2 and RE1 are also out of touch.
Step 2:REC analysis of failure information is assert the RE1 fault, and RE2 need change route.
Step 3:REC notice RE3 changes the optical fiber between RE3 and the RE2 over to the main attitude of using.
Step 4:RE3 and RE2 obtain synchronously, and REC and RE2 get in touch then.
Step 5:REC notice RE2 changes the optical fiber between RE2 and the RE1 over to standby attitude.
Step 6:REC on optical fiber for RE2 redistributes bandwidth, and the notice RE2.
This moment system the link topological diagram as shown in Figure 5, referring to Fig. 5, Fig. 5 is the link topological diagram after the RE troubleshooting embodiment illustrated in fig. 2.At this moment, ring has become chain a: REC-RE4-RE3-RE2.
This shows that no matter other nodes can both operate as normal when still being node failure at link failure for the distributed base station of using the inventive method networking, has guaranteed the reliability of system.
Present embodiment is that REC and each RE have been formed a ring, and REC and each RE provide two light mouths.In fact, also can form a plurality of looped networks as required.Referring to Fig. 6, Fig. 6 is the distributed base station annular networking schematic diagram of the present invention's second preferred embodiment.In the present embodiment, formed 3 rings, wherein REC provides 4 pairs of light mouths, has formed two rings of REC-RE1-RE2-RE3-RE4-REC and REC-RE5-RE6-RE7-REC; RE2 also provides 4 light mouths, except above-mentioned first ring, has also formed another one ring: RE2-RE8-RE9-RE10-RE2.The mode of a ring of this networking mode and group relatively, the principle of handling is identical, this ring of treatment step relative complex, particularly RE2-RE8-RE9-RE10-RE2 need be set up by ring REC-RE1-RE2-RE3-RE4-REC and REC and get in touch and the transparent transmission interface message.But this mode is fit to the situation that REC connects a lot of RE.When a REC was connected to a ring with a lot of RE, if two sections link failures or two node failures, the node that has just possibly can't be connected on other nodes, so that the node that does not have fault that has can't continue operate as normal.If adopt a plurality of rings, the node that each ring connects can reduce the generation of this situation less relatively.
By the above embodiments as seen, the network-building method of this distributed base station of the present invention has been realized chain, annular networking, has saved transfer resource, has improved the reliability of whole system.
Claims (14)
1, a kind of network-building method of distributed base station is characterized in that, this method may further comprise the steps:
1) for the baseband portion in the distributed base station and each radio frequency part two or more light mouths is set respectively;
2) use the optical fiber cascade to circularize net by the described light mouth of step 1) baseband portion in the distributed base station and radio frequency part;
3) after radio frequency part starts, monitor the interface message of transmitting on the coupled optical fiber;
4) after baseband portion started, the one section optical fiber that is provided with in the ring network was standby optical fiber, and the superior and the subordinate's attribute of the radio frequency part that the active and standby attribute of increase optical fiber is connected with this optical fiber in described interface message;
5) baseband portion each radio frequency part by cascade is step by step to each radio frequency part transmission interface information, notify each radio frequency part its connect the active and standby attribute of optical fiber; Radio frequency part indicates oneself and is higher level's radio frequency part in the interface message that sends to the next stage radio frequency part;
6) after radio frequency part listens to the interface message of transmitting on the coupled optical fiber, from the interface message of baseband portion or the transmission of higher level's radio frequency part, obtain the active and standby attribute of this optical fiber and the superior and the subordinate's attribute of this radio frequency part.
2, the method for claim 1, it is characterized in that, the method of transmission interface message is on the coupled optical fiber of the described monitoring of step 3): radio frequency part is to baseband portion that is adjacent or radio frequency part transmission interface information, notify described baseband portion or the unknown of radio frequency part optical fiber attributes, wait for that this baseband portion or radio frequency part return the superior and the subordinate's attribute of the active and standby attribute of optical fiber and this baseband portion or radio frequency part.
3, the method for claim 1, it is characterized in that, when known its of radio frequency part is the subordinate of adjacent baseband portion or radio frequency part, to this baseband portion or radio frequency part transmission interface information, notice baseband portion or the unknown of radio frequency part optical fiber attributes, wait baseband portion or radio frequency part are returned the active and standby attribute of optical fiber.
4, as claim 1,2 or 3 described methods, it is characterized in that this method further comprises: when radio frequency part and baseband portion were out of touch, radio frequency part was monitored the interface message of transmitting on the coupled optical fiber again.
5, the method for claim 1 is characterized in that, when this method was applied to the interface standard CPRI interface of baseband portion and radio frequency part, original Service Access point faulty indication SDI bit was multiplexing in the active and standby attribute of described optical fiber and the interface message.
6, the method for claim 1 is characterized in that, described step 5) to step 6) comprises the ring network start-up course, and this process may further comprise the steps:
A, start baseband portion, baseband portion is learnt according to configuration information and the structure of whole ring is determined that then which section optical fiber is standby optical fiber;
All radio frequency part of B, baseband portion and the first order obtain mutually respectively synchronously;
C, baseband portion use High-level Data Link Control HDLC link or Ethernet to send the Operation and Maintenance information that comprises interface message respectively to all radio frequency part of the first order, the active and standby attribute of all radio frequency part optical fiber of the notice first order;
The radio frequency part of D, the corresponding levels and all radio frequency part of next stage obtain mutually respectively synchronously; And indicate this radio frequency part for the higher level;
E, baseband portion are set up with all radio frequency part of next stage step by step and are got in touch;
F, baseband portion use HDLC link or Ethernet to send the Operation and Maintenance information that has comprised interface message respectively to all radio frequency part of next stage step by step, the active and standby attribute of all radio frequency part optical fiber of notice next stage;
If G also has next stage radio frequency part, then repeated execution of steps D-G; Otherwise start-up course is finished.
7, method as claimed in claim 6 is characterized in that, baseband portion is learnt the structure of whole ring according to the system configuration information of the hardware annexation between each radio frequency part, each radio frequency part in the steps A, and determines which section to be standby optical fiber.
8, method as claimed in claim 6, it is characterized in that, synchronizing process among the step B between baseband portion and radio frequency part for both sides from starting the process that the back can proper communication to mutually, comprise rate adapted, clock synchronization, interface format checking procedure at least.
9, method as claimed in claim 6, it is characterized in that, the process of the described foundation contact of step e is: baseband portion sends the Operation and Maintenance information of baseband portion to contact between the target radio frequency part of setting up to first order radio frequency part, after first order radio frequency part is received this information, judge this information according to wherein HDLC address or IP address and whether send to oneself, if not, then this information is passed through next stage, next stage passes through next stage more in the same way, up to the target radio frequency part, target radio frequency is promptly set up contact after partly receiving this information.
10, method as claimed in claim 6, it is characterized in that, the described process of the active and standby attribute of optical fiber of notifying step by step of step F is: baseband portion sends the active and standby property operations maintenance information of notification target radio frequency part optical fiber to first order radio frequency part, after first order radio frequency part is received this information, judge according to wherein HDLC address or IP address whether this information sends to oneself, if not, then this information is passed through next stage, next stage passes through next stage more in the same way, up to the target radio frequency part.
11, the method for claim 1 is characterized in that, this method further comprises the business datum repeating process, and this process comprises:
A, baseband portion are determined good each radio frequency part business datum position in interface frame earlier before carrying out the business datum forwarding, and the position of business datum in interface frame distributed to each radio frequency part by high-level signaling by baseband portion; Each radio frequency part writes down this position;
When B, radio frequency part are received the business datum that the higher level sends,, read the business datum of this position according to the position of this radio frequency part business datum in interface frame of record; Return business datum to the higher level if desired, then the business datum that will return is filled into the position in the above-mentioned interface frame, returns to the higher level; For the business datum of non-radio frequency part in the interface frame, then pass through next stage or the transparent upper level that returns to.
12, the method for claim 1, it is characterized in that, this method further comprises time-delay measuring method, it is: self is measured and write down to baseband portion to the propagation delay time of next stage radio frequency part and the processing delay of self, radio frequency part is measured this equipment to the propagation delay time of next stage equipment, and and self processing delay report baseband portion together; Baseband portion is according to network configuration, and the uplink time delay that each radio frequency part is reported adds up, and adds this baseband portion and obtains total uplink time delay to the uplink time delay of next stage radio frequency part and the processing delay of this baseband portion; The descending time delay that each radio frequency part is reported adds up, and adds this baseband portion and obtains total descending time delay to the downlink transfer time delay of next stage radio frequency part and the processing delay of this baseband portion.
13, the method for claim 1 is characterized in that, this method further comprises the link failure processing procedure, and this process may further comprise the steps:
A, radio frequency part are given baseband portion the report information that the link to the next stage radio frequency part breaks down, and behind the baseband portion analysis of failure, determine to need to activate standby optical fiber;
The radio frequency part of B, baseband portion notice report fault changes the optical fiber that link failure occurs over to standby attitude;
The radio frequency part that C, baseband portion notice link to each other with former standby optical fiber changes this section optical fiber over to the main attitude of using;
The radio frequency part of the other end of described radio frequency part of D, step C and link failure obtains synchronously, and baseband portion and this radio frequency part are set up and got in touch then; The optical fiber that baseband portion notifies this radio frequency part link failure will occur changes standby attitude over to;
E, baseband portion redistribute bandwidth newly changing on the main optical fiber with attitude.
14, the method for claim 1 is characterized in that, this method further comprises the radio frequency part fault treating procedure, and this process may further comprise the steps:
A, baseband portion are analyzed fault, determine which radio frequency part breaks down;
B, baseband portion change former standby optical fiber over to the main attitude of using;
C, change main radio frequency part with attitude optical fiber two ends over to and obtain synchronously, baseband portion is got in touch with the radio frequency part that links to each other with the fault radio frequency part then; Baseband portion notifies this radio frequency part to change the optical fiber that its other end links to each other with the fault radio frequency part over to standby attitude;
D, baseband portion redistribute bandwidth newly changing on the main optical fiber with attitude.
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