CN105072590B - Multi-user's frequency point interlock method and system in a kind of point-to-multipoint microwave telecommunication system - Google Patents
Multi-user's frequency point interlock method and system in a kind of point-to-multipoint microwave telecommunication system Download PDFInfo
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- CN105072590B CN105072590B CN201510570293.1A CN201510570293A CN105072590B CN 105072590 B CN105072590 B CN 105072590B CN 201510570293 A CN201510570293 A CN 201510570293A CN 105072590 B CN105072590 B CN 105072590B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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Abstract
The present invention discloses multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system, it include: that central station initiates working frequency points switching, including central station broadcast frequency handover request to all subscriber stations, subscriber station is responded after receiving request, central station broadcasts frequency handover confirmation after situation is handled according to response, subscriber station changes local terminal frequency point after receiving confirmation, and central station is handled according to subscriber station frequency handover situation and modifies local terminal frequency point；Initiate working frequency points switching in any user station, it requests including subscriber station unicast frequency handover to central station, broadcast is transmitted to all subscriber stations after central station receives request, subscriber station is responded after receiving request, central station after situation is handled according to response broadcast transmission frequency handover confirm, subscriber station changes local terminal frequency point after receiving confirmation, and central station is handled according to subscriber station frequency handover situation and modifies local terminal frequency point.It, being capable of fast switching system working frequency points after any website initiation frequency handover request can be achieved.
Description
Technical field
The present invention relates to be mostly used in microwave transmission system technical field more particularly to a kind of point-to-multipoint microwave telecommunication system
Family frequency point interlock method and system.
Background technique
Point-to-multipoint microwave telecommunication system includes a central station and multiple subscriber stations, and central station can be logical with any subscriber station
It crosses microwave signal to be communicated, is that can not carry out microwave communication between any two subscriber station, typical networking mode such as Fig. 8 institute
Show, four big entities, the indoor unit (IDU) of central station and the outdoor unit (ODU) of central station, the interior of subscriber station can be divided into
The outdoor unit (ODU) of unit (IDU) and subscriber station.Central station/subscriber station IDU and ODU is by IF cable or light
Fibre connection is to realize information exchange by microwave signal between the ODU of central station and the ODU of subscriber station to realize information exchange.
In practical application, central station and subscriber station are usually relatively far apart.
The central station and subscriber station of point-to-multipoint microwave telecommunication system need work in identical frequency point, use OFDM technology
So that each subscriber station work is on the different subcarriers under the frequency point.Once change, which occurs, for the frequency point of certain one end leads to both ends
On different frequency points, microwave communication will be forced to interrupt for work.When needing the working frequency points of switching system, it usually needs go to
Each website is switched to target frequency point, and this maintenance mode is very inconvenient, cost of idleness, thereby increases and it is possible to cause disconnected station for a long time, shadow
Ring user experience.It is more obvious due to switching the problem of frequency point causes in especially point-to-multipoint microwave telecommunication system.
Summary of the invention
Aiming at the problem that background technique proposes, the present invention provides multi-user's frequency point in a kind of point-to-multipoint microwave telecommunication system
Interlock method and system, when switching the working frequency points of any website, the frequency point of other websites can be quickly switched to automatically
Target frequency point, to realize the working frequency points that can fast and effeciently switch whole system, the handoff procedure used time is short, easy to operate.
In order to solve the above-mentioned technical problem, technical solution of the present invention is specific as follows:
Multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system, the point-to-multipoint microwave telecommunication system
Including central station and multiple subscriber stations；
When central station initiates frequency handover, comprising the following steps:
S110, central station send frequency handover request to all subscriber stations, and broadcast the target frequency point for needing to be switched to；
S120, subscriber station receive frequency handover request and target frequency point after to central station send response message；
S130, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
S140, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；
After S150, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are cut
Change to target frequency point；
When any subscriber station initiates frequency handover, comprising the following steps:
S210, a certain subscriber station send frequency handover request to central station, and inform the target that central station needs to be switched to
Frequency point；
S220, central station transfer it to all subscriber stations after receiving frequency handover request, and broadcast what needs were switched to
Target frequency point；
S230, subscriber station receive frequency handover request and target frequency point after to central station send response message；
S240, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
S250, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；
After S260, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are cut
Change to target frequency point.
Wherein, the step S110, central station send frequency handover request to all subscriber stations, and broadcast needs and be switched to
Target frequency point；Specifically:
Central station detects whether to need switch operating frequency point, if so, group claim frame and by microwave link to broadcast
Mode is sent to all subscriber stations, wherein frequency handover request flag, target frequency point and target user are carried in the claim frame
It stands id information；
The S120, subscriber station receive frequency handover request and target frequency point after to central station send response message；Specifically
Are as follows:
After subscriber station receives the claim frame that central station is sent, organizes response frame and central station is sent to by microwave link,
Instruction has been received by frequency handover claim frame, and frequency handover response mark, target frequency point and subscriber station mark are carried in the response frame
Will information；
The S130, central station handle and disappear to all subscriber station broadcast acknowledgements after receiving the response message of subscriber station
Breath；Specifically:
Central station judges whether that all subscriber stations all receive frequency handover request according to the response frame received；If
All subscriber stations all receive frequency handover request, then group acknowledge frame and by microwave link be sent in a broadcast manner it is all
Accessing user station indicates that all accessing users stand by frequency handover to target frequency point；If certain user station does not receive frequency
Point switching request, repeats step S110 and S120, has then detected whether that subscriber station does not receive frequency handover request again, if
Have, then record the information of these subscriber stations and report, then group acknowledge frame and is sent in a broadcast manner by microwave link
Accessed user station indicates the subscriber station accessed by frequency handover to target frequency point；
The S140, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；Specifically:
Subscriber station receives frequency handover to target frequency point after frequency handover acknowledgement frame；
After the S150, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal is worked frequently
Point is switched to target frequency point；Specifically:
Central station detects whether that all subscriber stations accessed are all switched to target frequency point, if having detected subscriber station not
It is switched to target frequency point, then after sending a frequency handover acknowledgement frame again, detects whether there is the subscriber station not switched again,
If so, then reporting the subscriber station for not switching to target frequency point, the working frequency points of our station are finally switched to target value.
Wherein, the step S210, a certain subscriber station send frequency handover request to central station, and inform central station needs
The target frequency point being switched to；Specifically:
Subscriber station detects whether to need switch operating frequency point, if so, organizing claim frame and by microwave link with unicast
Mode is sent to central station, wherein frequency handover request flag, target frequency point and calling subscriber station ID are carried in the claim frame
Information；
The S230, subscriber station receive frequency handover request and target frequency point after to central station send response message；Specifically
Are as follows:
After subscriber station receives the claim frame that central station is sent, organizes response frame and sent out in a manner of unicast microwave link
Central station is given, instruction has been received by frequency handover claim frame, and frequency handover response mark, target frequency point are carried in the response frame
And subscriber station flag information；
The S240, central station handle and disappear to all subscriber station broadcast acknowledgements after receiving the response message of subscriber station
Breath；Specifically:
Central station judges whether that all subscriber stations all receive frequency handover request according to the response frame received；If
All subscriber stations all receive frequency handover request, then group acknowledge frame and by microwave link be sent in a broadcast manner it is all
Accessing user station indicates that all accessing users stand by frequency handover to target frequency point；If certain user station does not receive frequency
Point switching request, repeats step S220 and S230, has then detected whether that subscriber station does not receive frequency handover request again, if
Have, then record the information of these subscriber stations and report, then group acknowledge frame and is sent in a broadcast manner by microwave link
Accessed user station indicates the subscriber station accessed by frequency handover to target frequency point；
The S250, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；Specifically:
Subscriber station receives frequency handover to target frequency point after frequency handover acknowledgement frame；
After the S260, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal is worked frequently
Point is switched to target frequency point；Specifically:
Central station detects whether that all subscriber stations accessed are all switched to target frequency point, if having detected subscriber station not
It is switched to target frequency point, then after sending a frequency handover acknowledgement frame again, detects whether there is the subscriber station not switched again,
If so, then reporting the subscriber station for not switching to target frequency point, the working frequency points of our station are finally switched to target value.
Wherein, the method, further includes: after central station sends frequency handover claim frame, opening timing device has in timer
The response for carrying out transmission from subscriber station in the effect time at interval of certain time reception, after timer time arrives, if not receiving all stations
Response frame then retransmits frequency handover claim frame.
Wherein, the method, further includes: after central station forwards frequency handover claim frame, opening timing device has in timer
The response for carrying out transmission from subscriber station in the effect time at interval of certain time reception, after timer time arrives, if not receiving all stations
Response frame then forwards frequency handover claim frame again.
Wherein, three kinds of frame types that the information interactive process between central station and subscriber station uses, including claim frame, response
Frame and acknowledgement frame, the frame structure of the claim frame, response frame and acknowledgement frame, including frame head, CRC check, content frame and postamble；Institute
Frame head and postamble are stated using different spcial characters to identify；The content frame includes frame type, data overall length, User ID and frequency
Point, the data overall length indicate the content frame length in addition to frame type, are mainly used for later period extension, the User ID is for transmitting
Subscriber station information in interactive process, the User ID of central station are a distinctive mark 0xff, and the frequency point is needed for transmitting
The target frequency point being switched to.
A kind of system using multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system described above,
The system, including central station, subscriber station and microwave link；
The central station between microwave link and subscriber station by being communicated.
The utility model has the advantages that
Multi-user's frequency point interlock method and system in a kind of point-to-multipoint microwave telecommunication system of the present invention, Neng Goushi
Now when switching the working frequency points of any website, the frequency point of other websites can quickly be switched to target frequency point automatically, with reality
It now can fast and effeciently switch the working frequency points of whole system, the handoff procedure used time is short, easy to operate.
Detailed description of the invention
Stand centered on Fig. 1 initiation frequency handover when central station and subscriber station interaction diagrams.
The interaction diagrams of central station and subscriber station when Fig. 2 is the frequency handover of subscriber station initiation.
The information interaction frame structure stood centered on Fig. 3 with subscriber station.
Central station flow chart during the frequency handover of initiation of standing centered on Fig. 4.
Subscriber station flow chart/some subscriber station initiates frequency handover mistake during the frequency handover of initiation of standing centered on Fig. 5
Other users station flow chart in journey.
Fig. 6 is the subscriber station flow chart of initiation request during the frequency handover that subscriber station is initiated.
Fig. 7 is central station flow chart during the frequency handover that subscriber station is initiated.
Fig. 8 is point-to-multipoint microwave telecommunication system schematic diagram.
English-Chinese table:
IDU:indoor unit, indoor unit.
ODU:outdoor unit, outdoor unit.
CRC:cyclic redundancy check, cyclic redundancy check code.
ID:identity, identity.
OFDM:Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing.
Specific embodiment
Below in conjunction with drawings and examples the present invention will be described in detail technical solution.
According to the initiator of frequency handover, multi-user's frequency point linkage scheme proposed by the present invention mainly includes that central station is sent out
Frequency handover two parts that the frequency handover and subscriber station risen is initiated.
The method provided in the embodiment of the present invention includes following procedure:
Stand centered on Fig. 1 initiation frequency handover when central station and subscriber station interaction diagrams.As shown in Figure 1, center
When initiation frequency handover of standing, comprising the following steps:
S110, central station initiate frequency handover request to all subscriber stations, and broadcast the target frequency point for needing to be switched to；
Specifically, central station detects whether to need switch operating frequency point, if so, organizing claim frame as required and passing through microwave
Link is sent to all subscriber stations in a broadcast manner, wherein frequency handover request flag, target frequency are carried in the claim frame
Point and calling subscriber station id information.
S120, subscriber station receive frequency handover request and target frequency point after to central station send response message；
Specifically, it after subscriber station receives the claim frame that central station is sent, organizes response frame and is sent to by microwave link
Central station, instruction have been received by frequency handover claim frame, and frequency handover response mark, target frequency point and use are carried in the response frame
Family station indicator information.
S130, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
Specifically, central station judges whether that all subscriber stations all receive frequency handover and ask according to the response frame received
It asks；If all subscriber stations all receive frequency handover request, group acknowledge frame is simultaneously sent by microwave link in a broadcast manner
It stands to all accessing users, indicates that all accessing users stand by frequency handover to target frequency point；If certain user stands
Frequency handover request is not received, is repeated step S110 and S120, has then been detected whether that subscriber station does not receive frequency handover again
Then request group acknowledge frame and passes through side of the microwave link to broadcast if so, then record the information of these subscriber stations and report
Formula is sent to accessed user station, indicates the subscriber station accessed by frequency handover to target frequency point.
S140, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；
Specifically, subscriber station receives frequency handover to target frequency point after frequency handover acknowledgement frame.
After S150, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are cut
Change to target frequency point；
Specifically, central station detects whether that all subscriber stations accessed are all switched to target frequency point, if detected
Subscriber station does not switch to target frequency point, then again send a frequency handover acknowledgement frame after, detect whether again exist do not switch
Subscriber station the working frequency points of our station are finally switched to mesh if so, then reporting the subscriber station for not switching to target frequency point
Scale value.
The interaction diagrams of central station and subscriber station when Fig. 2 is the frequency handover of subscriber station initiation.As shown in Fig. 2, any
When subscriber station initiates frequency handover, comprising the following steps:
S210, a certain subscriber station send frequency handover request to central station, and inform the target that central station needs to be switched to
Frequency point；
Specifically: subscriber station detects whether to need switch operating frequency point, if so, group claim frame and by microwave link with
The mode of unicast is sent to central station, wherein carries frequency handover request flag, target frequency point and target in the claim frame and uses
Family station id information.
S220, central station transfer it to all subscriber stations after receiving frequency handover request, and broadcast what needs were switched to
Target frequency point；
After central station receives frequency handover request, by microwave link in a broadcast manner by frequency handover request and mesh
Mark frequency point is forwarded to the subscriber station of all accesses.
S230, subscriber station receive frequency handover request and target frequency point after to central station send response message；
Specifically, after subscriber station receives the claim frame that central station is sent, response frame is organized and by microwave link with unicast
Mode be sent to central station, instruction has been received by frequency handover claim frame, carried in the response frame frequency handover response mark,
Target frequency point and subscriber station flag information.
The S240, central station handle and disappear to all subscriber station broadcast acknowledgements after receiving the response message of subscriber station
Breath；
Specifically: central station judges whether that all subscriber stations all receive frequency handover and ask according to the response frame received
It asks；If all subscriber stations all receive frequency handover request, group acknowledge frame is simultaneously sent by microwave link in a broadcast manner
It stands to all accessing users, indicates that all accessing users stand by frequency handover to target frequency point；If certain user stands
Frequency handover request is not received, is repeated step S220 and S230, has then been detected whether that subscriber station does not receive frequency handover again
Then request group acknowledge frame and passes through side of the microwave link to broadcast if so, then record the information of these subscriber stations and report
Formula is sent to accessed user station, indicates the subscriber station accessed by frequency handover to target frequency point.
The S250, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；
Specifically: subscriber station receives frequency handover to target frequency point after frequency handover acknowledgement frame.
After the S260, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal is worked frequently
Point is switched to target frequency point；
Specifically: central station detects whether that all subscriber stations accessed are all switched to target frequency point, if detected
Subscriber station does not switch to target frequency point, then again send a frequency handover acknowledgement frame after, detect whether again exist do not switch
Subscriber station the working frequency points of our station are finally switched to mesh if so, then reporting the subscriber station for not switching to target frequency point
Scale value.
In summary, it is seen then that multi-user's frequency point linkage side in a kind of point-to-multipoint microwave telecommunication system of the present invention
Method and system, the frequency point that can be realized other websites when switching the working frequency points of any website can quickly switch automatically
To target frequency point, to realize the working frequency points that can fast and effeciently switch whole system, the handoff procedure used time is short, operation letter
It is single.
The information interaction frame structure stood centered on Fig. 3 with subscriber station.As shown in figure 3, in the present solution, central station and use
Three kinds of frame types that information interactive process between the station of family uses, including claim frame, response frame and acknowledgement frame, the claim frame,
The frame structure of response frame and acknowledgement frame, including frame head, CRC check, content frame and postamble；The frame head and postamble are using different
Spcial character identifies；The content frame includes frame type, data overall length, User ID and frequency point, and the data overall length instruction removes
Content frame length outside frame type, is mainly used for later period extension, and the User ID is used to transmit the subscriber station letter in interactive process
Breath, the User ID of central station are a distinctive mark 0xff, the frequency point, for transmitting the target frequency point for needing to be switched to.
Frame head: for detecting the beginning of a whole frame, with a special character come the starting of mark one frame.
CRC check: verifying content frame using sixteen bit CRC check multinomial, generate 16 CRC check and.
Content frame: content frame is used to transmit the effective information during frequency handover, including frame type, data overall length, frequency
Point and four parts of User ID.Frame type is used to indicate the type of transmitted frame, the frame type transmitted during frequency handover
Including three kinds of claim frame (0x01), response frame (0x02) and acknowledgement frame (0x03)；Data overall length is used to indicate in addition to frame type
Content frame length is mainly used for later period extension；Frequency point is used to indicate the target frequency point of switching；User ID is for transmitting interactive process
In subscriber station information, the User ID of central station is a distinctive mark 0xff.
Postamble: the ending of one whole frame of mark is indicated with a special character, in order to distinguish the postamble of previous frame
With the frame head of next frame, postamble and frame head use different characters.
The method also includes, after central station sends frequency handover claim frame, opening timing device, in timer effective time
The interior response for carrying out transmission from subscriber station at interval of certain time reception, after timer time arrives, if not receiving the response frame at all stations,
Then retransmit frequency handover claim frame.
The method also includes, after central station forwards frequency handover claim frame, opening timing device, in timer effective time
The interior response for carrying out transmission from subscriber station at interval of certain time reception, after timer time arrives, if not receiving the response frame at all stations,
Frequency handover claim frame is then forwarded again.
The frequency handover initiated for central station requests process, including central station process and subscriber station process two parts, tool
Body implementation steps are as follows:
Central station flow chart during the frequency handover of initiation of standing centered on Fig. 4.As shown in figure 4,
In step sl, central station starts to initiate frequency handover request；Subsequently into step S2.
In step s 2, central station detects and judges whether to need switching system frequency point, if you do not need to switching system frequency
Point, then enter step S14；Otherwise S3 is entered step.
In step s3, for central station according to frame structure group frequency handover claim frame shown in Fig. 3, frame type is claim frame
(0x01), frequency point are station (0xff) centered on the target frequency point for needing to switch, User ID；And by the claim frame of composition to broadcast
Mode is sent to all subscriber stations, opens a timer, the response of subscriber station is received in timing, subsequently into step
Rapid S4.
In step s 4, central station, which waits for a period of time, starts to receive the response frame for carrying out transmission from subscriber station, subsequently into step
S5。
In step s 5, central station judges whether timer timing reaches, if timing does not arrive, enters step
Rapid S4；If timing reaches, S6 is entered step.
In step s 6, central station judges whether that all users receive frequency handover by received subscriber station response frame
Request, if it is, entering step S9；Otherwise S7 is entered step.
In the step s 7, central station judges whether frequency handover claim frame was retransmitted, if do not retransmitted, returns to step
Rapid S3；Otherwise S8 is entered step.
In step s 8, central station will still not receive the subscriber station information reporting of frequency handover request, subsequently into step
Rapid S9.
In step s 9, for central station according to frame structure group frequency handover acknowledgement frame shown in Fig. 3, frame type is acknowledgement frame
(0x03), frequency point are station (0xff) centered on the target frequency point for needing to switch, User ID；And by the acknowledgement frame of composition to broadcast
Mode is sent to all subscriber stations, a timer is opened, subsequently into step S10.
In step slo, judge whether that all subscriber stations all complete frequency handover after central station waiting timer time-out, such as
Fruit is then to enter step S13；Otherwise S11 is entered step.
In step s 11, central station judges whether frequency handover acknowledgement frame was retransmitted, if retransmitted, enters step
S12；Otherwise return step S9.
In step s 12, central station reports the subscriber station information of unfinished frequency handover.Subsequently into step S13.
In step s 13, central station is by the frequency handover of our station to target frequency point, subsequently into step S14.
In step S14, central station terminates the frequency handover process of central station initiation.
Subscriber station flow chart during the frequency handover of initiation of standing centered on Fig. 5.As shown in figure 5,
In step s101, subscriber station begins to respond to the frequency handover process initiated by central station, enters step S102.
In step s 102, subscriber station detects whether to receive frequency handover claim frame, if do not received, enters step
S107；Otherwise S103 is entered step.
In step s 103, for set of subscriber stations according to frame structure group frequency handover acknowledgement frame shown in Fig. 3, frame type is response
Frame (0x02), frequency point are the target frequency point for needing to switch, the ID that User ID is subscriber station itself；And by the acknowledgement frame of composition with list
The mode broadcast is sent to corresponding central station, subsequently into step S104.
In step S104, the message to be received from central station such as subscriber station, subsequently into step S105.
In step s105, subscriber station judges whether to receive frequency handover acknowledgement frame, enters step if receiving
S106, otherwise return step S104.
In step s 106, system frequency handover is target frequency point by subscriber station, subsequently into step S107.
In step s 107, subscriber station terminates the frequency handover responding process initiated by central station.
The frequency handover initiated for subscriber station requests process, subscriber station process, central station process including initiating request
With other users station process three parts, specific implementation step is as follows:
Fig. 6 is the subscriber station flow chart of initiation frequency handover request during the frequency handover that subscriber station is initiated.Such as Fig. 6 institute
Show,
In step s 201, subscriber station starts to initiate frequency handover process, subsequently into step S202.
In step S202, subscriber station judges whether to need switching system frequency point, enters step S203 if necessary；It is no
Then enter step S210.
In step S203, for subscriber station according to frame structure group frequency handover claim frame shown in Fig. 3, frame type is claim frame
(0x02), frequency point are the target frequency point for needing to switch, the ID that User ID is subscriber station itself；And by the claim frame of composition with unicast
Mode be sent to corresponding central station, a timer is opened, subsequently into step S204.
In step S204, subscriber station receives the message from central station, subsequently into step S205.
In step S205, subscriber station judge whether to receive the frequency handover from central station request, if it is into
Enter step S207；Otherwise S206 is entered step.
In step S206, subscriber station is when judging whether the timer expires or not；The return step S203 if time-out；Otherwise it returns
Step S204.
In step S207, subscriber station receives the message from central station；Subsequently into step S208.
In step S208, subscriber station judges whether to receive the frequency handover acknowledgement frame from central station, if it is, into
Enter step S209；Otherwise return step S207.
In step S209, subscriber station is by the frequency handover of oneself to target frequency point, subsequently into step S210.
In step S210, subscriber station terminates to request process by the frequency handover oneself initiated.
Fig. 7 is central station flow chart during the frequency handover that subscriber station is initiated.As shown in fig. 7,
In step S301, central station begins to respond to the frequency handover request process of subscriber station initiation, subsequently into step
S302。
In step s 302, central station judges whether to receive the frequency handover request that subscriber station is sent, if do not received,
Enter step S314；Otherwise S303 is entered step.
In step S303, the frequency handover received request is sent all users in a broadcast manner by central station
It stands, opens a timer, the response of subscriber station is received in timing, subsequently into step S304.
In step s 304, central station, which waits for a period of time, starts to receive the response frame for carrying out transmission from subscriber station, subsequently into step
Rapid S305.
In step S305, central station judges whether timer timing reaches, if timing does not arrive, enters
Step S304；If timing reaches, S306 is entered step.
In step S306, central station judges whether that all users receive frequency point and cut by received subscriber station response frame
Request is changed, if it is, entering step S309；Otherwise S307 is entered step.
In step S307, central station judges whether frequency handover claim frame was retransmitted, if do not retransmitted, returns
Step S303；Otherwise S308 is entered step.
In step S308, central station will still not receive the subscriber station information reporting of frequency handover request, subsequently into
Step S309.
In step S309, for central station according to frame structure group frequency handover acknowledgement frame shown in Fig. 3, frame type is acknowledgement frame
(0x03), frequency point are station (0xff) centered on the target frequency point for needing to switch, User ID；And by the acknowledgement frame of composition to broadcast
Mode is sent to all subscriber stations, a timer is opened, subsequently into step S310.
In step s310, judge whether that all subscriber stations all complete frequency handover after central station waiting timer time-out,
If it is, entering step S313；Otherwise S311 is entered step.
In step S311, central station judges whether frequency handover acknowledgement frame was retransmitted, if retransmitted, enters step
S312；Otherwise return step S309.
In step S312, central station reports the subscriber station information of unfinished frequency handover.Subsequently into step S313.
In step S313, central station is by the frequency handover of our station to target frequency point, subsequently into step S314.
In step S314, central station terminates the frequency handover process initiated by subscriber station.
Fig. 5 is other non-initiator's subscriber station flow charts during the frequency handover that some subscriber station is initiated.Such as Fig. 5 institute
Show,
In step s101, other users station begins to respond to the frequency handover process initiated by some subscriber station, into step
Rapid S102.
In step s 102, subscriber station detects whether to receive frequency handover claim frame, if do not received, enters step
S107；Otherwise S103 is entered step.
In step s 103, for set of subscriber stations according to frame structure group frequency handover acknowledgement frame shown in Fig. 3, frame type is response
Frame (0x02), frequency point are the target frequency point for needing to switch, the ID that User ID is subscriber station itself；And by the acknowledgement frame of composition with list
The mode broadcast is sent to corresponding central station, subsequently into step S104.
In step S104, the message to be received from central station such as subscriber station, subsequently into step S105.
In step s105, subscriber station judges whether to receive frequency handover acknowledgement frame, enters step if receiving
S106, otherwise return step S104.
In step s 106, system frequency handover is target frequency point by subscriber station, subsequently into step S107.
In step s 107, subscriber station terminates the frequency handover responding process initiated by central station.
Above embodiment contains multi-user's frequency point linkage scheme overall process, so that any one website needs to switch frequency
When point, it can automatically and efficiently switch the frequency point of whole system, it is ensured that the communication of whole system is normal.
Fig. 8 is point-to-multipoint microwave telecommunication system schematic diagram.As shown in figure 8, a kind of arrived using a kind of point described above
The system of multi-user's frequency point interlock method, the system, including central station, subscriber station and microwave links in multiple spot microwave telecommunication system
Road；
The central station between microwave link and subscriber station by being communicated.
As shown in figure 8, the system includes a central station and the multiple users communicated with central station by microwave link
It stands；Communication between subscriber station need to be by central station as terminal.Central station includes central station IDU and central station ODU, described
Central station IDU is connect by optical cable/cable with central station ODU；Subscriber station includes subscriber station IDU and subscriber station ODU, the user
The IDU that stands is connect by optical cable/cable with subscriber station ODU.
By using the system of above-mentioned multi-user's frequency point interlock method, can be realized when any one website needs to switch system
When system frequency point, it can automatically and efficiently switch the frequency point of whole system, it is ensured that the communication of whole system is normal.
Embodiment is illustrated technical solution of the present invention and non-limiting.Pass through the description of above embodiments, ability
Field technique personnel can clearly understand that technical solution of the present invention, and can modify to embodiment or equally replace
It changes, without departing from the spirit and scope of the present invention, should be included in the claimed scope of the claims of the present invention.
Claims (7)
1. multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system, which is characterized in that described point-to-multipoint micro-
Communi-cation system includes central station and multiple subscriber stations；
When central station initiates frequency handover, comprising the following steps:
S110, central station send frequency handover request to all subscriber stations, and broadcast the target frequency point for needing to be switched to；
S120, subscriber station receive frequency handover request and target frequency point after to central station send response message；
S130, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
S140, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；
After S150, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are switched to
Target frequency point；
When any subscriber station initiates frequency handover, comprising the following steps:
S210, a certain subscriber station send frequency handover request to central station, and inform the target frequency point that central station needs to be switched to；
S220, central station transfer it to all subscriber stations after receiving frequency handover request, and broadcast the target for needing to be switched to
Frequency point；
S230, subscriber station receive frequency handover request and target frequency point after to central station send response message；
S240, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
S250, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；
After S260, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are switched to
Target frequency point；
The S130, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
Specifically:
Central station judges whether that all subscriber stations all receive frequency handover request according to the response frame received；If all
Subscriber station all receives frequency handover request, then group acknowledge frame and is sent to all accesses in a broadcast manner by microwave link
Subscriber station indicates that all accessing users stand by frequency handover to target frequency point；If certain user station does not receive frequency point and cuts
Request is changed, step S110 and S120 are repeated, has then detected whether that subscriber station does not receive frequency handover request again, if so,
It then records the information of these subscriber stations and reports, then group acknowledge frame and be sent to connect in a broadcast manner by microwave link
Access customer station indicates the subscriber station accessed by frequency handover to target frequency point；
After the S150, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are cut
Change to target frequency point；Specifically:
Central station detects whether that all subscriber stations accessed are all switched to target frequency point, if having detected that subscriber station does not switch
To target frequency point, then after sending a frequency handover acknowledgement frame again, detect whether there is the subscriber station not switched again, if
Have, then report the subscriber station for not switching to target frequency point, the working frequency points of our station are finally switched to target value；
The S230, subscriber station receive frequency handover request and target frequency point after to central station send response message；Specifically:
After subscriber station receives the claim frame that central station is sent, organizes response frame and be sent in a manner of unicast microwave link
Central station, instruction have been received by frequency handover claim frame, and frequency handover response mark, target frequency point and use are carried in the response frame
Family station indicator information；
The S250, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；Specifically:
Subscriber station receives frequency handover to target frequency point after frequency handover acknowledgement frame.
2. multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system according to claim 1, feature
It is, the step S110, central station send frequency handover request to all subscriber stations, and broadcast the target frequency for needing to be switched to
Point；Specifically:
Central station detects whether to need switch operating frequency point, if so, organizing claim frame and passing through microwave link in a broadcast manner
It is sent to all subscriber stations, wherein frequency handover request flag, target frequency point and calling subscriber station ID are carried in the claim frame
Information；
The S120, subscriber station receive frequency handover request and target frequency point after to central station send response message；Specifically:
After subscriber station receives the claim frame that central station is sent, organizes response frame and central station is sent to by microwave link, indicate
Frequency handover claim frame is had been received by, frequency handover response mark, target frequency point and user's station indicator letter are carried in the response frame
Breath；
The S140, subscriber station receive and working frequency points are switched to target frequency point after confirmation message；Specifically:
Subscriber station receives frequency handover to target frequency point after frequency handover acknowledgement frame.
3. multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system according to claim 1, feature
It is, the step S210, a certain subscriber station send frequency handover request to central station, and inform what central station needed to be switched to
Target frequency point；Specifically:
Subscriber station detects whether to need switch operating frequency point, if so, organizing claim frame and microwave link in a manner of unicast
It is sent to central station, wherein frequency handover request flag, target frequency point and calling subscriber station ID letter are carried in the claim frame
Breath；
The S240, central station, which receive, carries out processing after the response message of subscriber station and to all subscriber station broadcast acknowledgements message；
Specifically:
Central station judges whether that all subscriber stations all receive frequency handover request according to the response frame received；If all
Subscriber station all receives frequency handover request, then group acknowledge frame and is sent to all accesses in a broadcast manner by microwave link
Subscriber station indicates that all accessing users stand by frequency handover to target frequency point；If certain user station does not receive frequency point and cuts
Request is changed, step S220 and S230 are repeated, has then detected whether that subscriber station does not receive frequency handover request again, if so,
It then records the information of these subscriber stations and reports, then group acknowledge frame and be sent to connect in a broadcast manner by microwave link
Access customer station indicates the subscriber station accessed by frequency handover to target frequency point；
After the S260, central station detect subscriber station working frequency points switch instances and handle accordingly, local terminal working frequency points are cut
Change to target frequency point；Specifically:
Central station detects whether that all subscriber stations accessed are all switched to target frequency point, if having detected that subscriber station does not switch
To target frequency point, then after sending a frequency handover acknowledgement frame again, detect whether there is the subscriber station not switched again, if
Have, then report the subscriber station for not switching to target frequency point, the working frequency points of our station are finally switched to target value.
4. multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system according to claim 2, feature
It is, the method, further includes: after central station sends frequency handover claim frame, opening timing device, within timer effective time
The response for carrying out transmission from subscriber station at interval of certain time reception, after timer time arrives, if not receiving the response frame at all stations,
Retransmit frequency handover claim frame.
5. multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system according to claim 3, feature
It is, the method, further includes: after central station forwards frequency handover claim frame, opening timing device, within timer effective time
The response for carrying out transmission from subscriber station at interval of certain time reception, after timer time arrives, if not receiving the response frame at all stations,
Again frequency handover claim frame is forwarded.
6. multi-user's frequency point interlock method in a kind of point-to-multipoint microwave telecommunication system according to claim 2 or 3, special
Sign is, three kinds of frame types that the information interactive process between central station and subscriber station uses, including claim frame, response frame and really
Recognize frame, the frame structure of the claim frame, response frame and acknowledgement frame, including frame head, CRC check, content frame and postamble；The frame head
It is identified with postamble using different spcial characters；The content frame includes frame type, data overall length, User ID and frequency point, institute
It states data overall length and indicates the content frame length in addition to frame type, be mainly used for later period extension, the User ID is for transmitting interaction
Subscriber station information in the process, the User ID of central station are a distinctive mark 0xff, and the frequency point needs to switch for transmitting
The target frequency point arrived.
7. a kind of using multi-user's frequency point linkage in a kind of described in any item point-to-multipoint microwave telecommunication systems of claim 1-5
The system of method, which is characterized in that the system, including central station, subscriber station and microwave link；
The central station between microwave link and subscriber station by being communicated.
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| WO2012155699A1 (en) * | 2011-07-19 | 2012-11-22 | 中兴通讯股份有限公司 | Method and device for implementing multi-frequency point indoor wireless network channel |
| CN103703609A (en) * | 2012-07-04 | 2014-04-02 | 华为技术有限公司 | Microwave communication device and microwave communication system |
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| CN1207853A (en) * | 1996-03-27 | 1999-02-10 | 罗伯特·博施有限公司 | Point-multipoint radio transmission system |
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| WO2012155699A1 (en) * | 2011-07-19 | 2012-11-22 | 中兴通讯股份有限公司 | Method and device for implementing multi-frequency point indoor wireless network channel |
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