CN101448306A - Method and system for GSM circuit domain service station address selection, and radio frequency remote unit - Google Patents
Method and system for GSM circuit domain service station address selection, and radio frequency remote unit Download PDFInfo
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- CN101448306A CN101448306A CNA200810220478XA CN200810220478A CN101448306A CN 101448306 A CN101448306 A CN 101448306A CN A200810220478X A CNA200810220478X A CN A200810220478XA CN 200810220478 A CN200810220478 A CN 200810220478A CN 101448306 A CN101448306 A CN 101448306A
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Abstract
The embodiment of the invention provides a method for GSM circuit domain service station address selection, which is used for multi-station address co-district relay reversion and comprises the steps as follows: when a mobile station is accessed, the radio frequency remote unit RRU with the best signal quality is used as the current service station address of the mobile station; when a basic station controller BSC activates the channel of the mobile station, the previously selected RRU is used as the service station address of the activated channel; the radio frequency remote unit RRU with the best signal quality is periodically updated to be the service station address of the mobile station. The embodiment of the invention also provides a system and a radio frequency remote unit of the GSM circuit domain service station address selection. The technical proposal takes the signal quality as the basis and combines the filtering smoothing algorithm to select the service station address, greatly reducing the possibility of mistakenly selected service station addresses caused by the uncertainty of wireless link.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method, system and Remote Radio Unit of GSM circuit domain service station address selection.
Background technology
Along with The development in society and economy, people's work and rhythm of life are more and more faster, for adapting to allegro work of people and living needs, have occurred various rapid transit solutions in the global range, and wherein high-speed railway is the most representative land rapid transit.
It mainly is to adopt " macro base station+narrow beam high-gain aerial " that existing high-speed railway covers scheme, cooperates various algorithms and the main covering method of parameter configuration conduct under the high speed scene.By adopting the narrow beam high-gain aerial, optimize handoff algorithms and parameter configuration, effectively improved single sub-district coverage distance, reduce overlapping coveredly, covering performance is optimized.But common relatively handoff algorithms, the high speed handoff algorithms after the optimization has shortened time decision, but still needs long time decision; The overlay area time spent that bullet train passes through single macro base station, seldom the overlay area of passing through 1km according to the speed of 250km/h was an example, only needs 14.4s, switched still relatively more frequent; For guaranteeing handover success, grow overlapping covered need be set between two sub-districts, speed with 250km/h is example equally, suppose the overlapping covered of 10s is set, then respective distances is 694m, overlapping covered setting causes station spacing to reduce, and covers efficient and reduces underutilization of resources; The frequent switching causes quality to descend.
The inventor finds in realizing process of the present invention, high-speed railway is when bringing people's efficient operation and life, be subjected to the frequent switching in the high-speed mobile process, fast slow fading, Doppler effect, the car body material influence to factors such as wireless signal decay, network performance and user experience and descend obviously.
Summary of the invention
In view of this, be necessary to provide a kind of method, system and Remote Radio Unit of GSM circuit domain service station address selection, so that promote network performance and user's impression.
The embodiment of the invention provides a kind of method of GSM circuit domain service station address selection, is used for multistation location district relay altogether, comprising:
When travelling carriage inserted, selecting the radio frequency remote unit RRU of signal quality the best was described travelling carriage current service site;
When base station controller BSC activates the channel of described travelling carriage, with the RRU of aforementioned selection service site as the described channel that is activated;
Periodically just the radio frequency remote unit RRU of signal quality the best is updated to the service site of described travelling carriage.
The embodiment of the invention also provides a kind of Remote Radio Unit, comprising:
Selected cell is used for when travelling carriage inserts, and the radio frequency remote unit RRU of selecting signal quality the best is as described travelling carriage current service site;
Determining unit is used for when base station controller BSC activates the channel of described travelling carriage, with the RRU of the aforementioned selection service site as the described channel that is activated;
Updating block is used for periodically the RRU of signal quality the best being updated to the service site of described travelling carriage.
The embodiment of the invention also provides a kind of system of GSM circuit domain service station address selection, is used for multistation location district relay altogether, comprises first radio frequency remote unit RRU and at least one the 2nd RRU, and a described RRU comprises:
Selected cell is used for when travelling carriage inserts, and the radio frequency remote unit RRU of selecting signal quality the best is as described travelling carriage current service site;
Determining unit is used for when base station controller BSC activates the channel of described travelling carriage, with the RRU of the aforementioned selection service site as the described channel that is activated;
Updating block is used for periodically the RRU of signal quality the best being updated to the service site of described travelling carriage;
Described the 2nd RRU is used for signal quality data is reported a described RRU.
Is foundation by the embodiment of the invention with the signal quality, selects to serve the technical scheme of site, greatly reduces because the uncertainty of wireless link causes selecting the possibility of wrong service site, has promoted network performance and user impression.
Description of drawings
Fig. 1 is the method flow schematic diagram of the embodiment of the invention one GSM circuit domain service station address selection;
Fig. 2 is the method flow schematic diagram of the embodiment of the invention two GSM circuit domain service station address selections;
Fig. 3 is the structural representation of the embodiment of the invention three radio frequency extension units;
Fig. 4 is based on the concrete structure schematic diagram of the embodiment of the invention three radio frequency extension units of Fig. 3;
Fig. 5 is the structural representation of the system of the embodiment of the invention four GSM circuit domain service station address selections.
Embodiment
By with RRU (Remote Radio Unit, Remote Radio Unit) zooms out, make all RRU under the BBU (BasebandControl Unit, baseband control unit) adhere to different sites physically separately, be same sub-district in logic, thereby form multistation location cell scenario altogether.All keep receiving all RRU of sub-district constantly at up direction altogether, and all RRU of down direction have only BCCH channel carrier wave to keep emission, the RRU emission that other channel carrier waves are the best in quality according to the selective reception of travelling carriage present position.All RRU of sub-district keep having avoided delay dispersion synchronously on eating dishes without rice or wine altogether.Travelling carriage is between the different sites of sub-district altogether during fast moving, relay between different sites is switched and has been replaced the switching of original minizone, has effectively reduced switching times, simultaneously, altogether do not need to be provided with overlapping covered between a plurality of sites of sub-district, improved covering efficient.
Selection to the service site in the relay process between different sites is a key point.The service site is meant the RRU of travelling carriage wireless link the best of using with certain, generally is from closer one of this terminal.Yet under the environment of high-speed mobile, the uncertainty of wireless link will increase the possibility of wrong certain the service site of choosing greatly, and the travelling carriage that causes using can't provide service by the RRU of wireless link the best, has reduced network performance and user impression.
The method of GSM circuit domain service station address selection, can be size, received signal according to incoming level quality (signal to noise ratio (Signal To Noise Ratio, SNR)), distance (TA) thus wait to compare and determine.The inventor finds that in implementing process of the present invention signal quality is preferable foundation, and considers multipath and rapid fading, and it is also preferable that signal quality is carried out the effect that compares after the Filtering Processing.Therefore, the embodiment of the invention is foundation with the signal quality, in conjunction with the filtering smoothing algorithm, comes correct selection service site.
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Please refer to shown in Figure 1ly, the method for the embodiment of the invention one GSM circuit domain service station address selection is used for altogether district relay of multistation location, comprising:
Step S1, when travelling carriage inserted, the radio frequency remote unit RRU of selecting signal quality the best was as this travelling carriage current service site;
Step S2 is when base station controller BSC activates the channel of described travelling carriage, with the RRU of the aforementioned selection service site as the described channel that is activated;
Step S3 periodically is updated to the radio frequency remote unit RRU of signal quality the best the service site of described travelling carriage.
Referring again to shown in Figure 2, the method for the embodiment of the invention two GSM circuit domain service station address selections is used for multistation location district relay altogether, comprising:
Travelling carriage rigidly connects fashionable, owing to can't determine which RRU to provide service by for it, each RRU all deciphers, data after will deciphering after successfully decoded send to main RRU (main RRU also can be used as the service site), comprise information such as up signal quality (being SNR), position group number in the data that report.The position group number is used for distinguishing mutually with other RRU of this sub-district in the sign that each RRU distributed of same sub-district, and for example same sub-district comprises the individual RRU of N (N〉1), with A
1, A
2... A
N-1, A
NPosition group number as each RRU.
Main RRU logic receives the signal quality that all RRU (comprising main RRU self) report, and gives main RRU digital signal processor DSP (Digital Signal Processor) according to the line data on the way that algorithm filters out signal quality the best; After main RRU DSP receives, extract wherein " position group number ", report the access request message, carry " service RRU position group number " in the message to BSC." service RRU position group number " is used to identify the RRU that the service carrier wave is provided, and when signal quality the best that a certain RRU reports, then its position group number will report as " service RRU position group number ", and for example the position group number is A
2Signal quality the best of reporting of RRU, A then
2To report as service RRU position group number.
After BSC receives and inserts request message, to issue channel to main RRU DSP and activate message, what described message will be informed the current activation of main RRU is which channel (comprising signaling channel or Traffic Channel), and carry in the message " service RRU position group number ", main RRU DSP RRU that " the service RRU position group number " of carrying in the message is corresponding is as the current service site of described travelling carriage.
When step 204, channel activated, will the be activated service RRU position group number of channel of main RRU was broadcast on all RRU.
In the present embodiment, it is at starting stage (about one-period that channel is activated that main RRU continues service site as the channel that is activated with described service RRU position group number, 52 multi-frames for example), after starting stage because travelling carriage present position might change, therefore the signal quality between itself and each RRU also will change, need reselect the service site for it, descend to avoid network performance.
Each RRU (comprising main RRU) to up signal quality (SNR carries out smoothing processing), periodically is reported to main RRU according to filtering algorithm.In the present embodiment, the cycle is 52 multi-frames.
As previously mentioned, after the starting stage that channel activates, need reselect the service site to travelling carriage, the mode of selecting is the signal quality that each RRU of comparison reports, and selects the service site of the RRU of signal quality the best as travelling carriage, in this process, if each RRU all reports signal quality to main RRU all the time, then will consume a large amount of Internet resources, and cause network quality to descend, influence the normal use of travelling carriage; And if main RRU compares selection to the signal quality of each RRU of receiving all the time, it is bad that self performance also will become.Therefore, present embodiment takes each RRU periodically to report signal quality to main RRU, both can select to serve the site efficiently and accurately for travelling carriage, can avoid waste of network resources again.
Because each RRU periodically reports signal quality, main RRU also will periodically filter out the RRU of signal quality the best according to algorithm this moment, and the extracting position group number, be broadcast on all RRU.
After each RRU demodulation, judge whether the service RRU position group number of upgrading is the self-position group number, if then think it oneself is service site (service RRU), and data after demodulating is sent to main RRU, otherwise data can not send and directly abandon.Like this, have only selected RRU just to send data, help saving CPRI (Common Public Radio Interface, general common radio-frequency interface) transmission bandwidth.
Main RRU is by receiving the data after demodulating that the service site sends, and knows and determines described new service site, will obtain data from described service site, to carry out flow processing such as follow-up decoding.
In the present embodiment, RRU is during as the service site, and it is mutual that this channel uplink has only the RRU of this service site and travelling carriage to carry out signal.
Is foundation by present embodiment with signal quality (SNR), in conjunction with the technical scheme that the filtering smoothing algorithm selects to serve the site, greatly reduces because the uncertainty of wireless link causes selecting the possibility of wrong service site; Switch by periodicity (52 multi-frame) simultaneously and select the service site, select to serve the site efficiently and accurately, can avoid waste of network resources again for travelling carriage; Have only selected RRU just to send data, saved the CPRI transmission bandwidth; Thereby promoted network performance and user impression.
Please refer to shown in Figure 3ly, 31 kinds of Remote Radio Unit of the embodiment of the invention comprise:
Selected cell 31 is used for when travelling carriage inserts, and the radio frequency remote unit RRU of selecting signal quality the best is as described travelling carriage current service site;
Determining unit 32 is used for when base station controller BSC activates the channel of described travelling carriage, with the RRU of the aforementioned selection service site as the described channel that is activated;
Updating block 33 is used for periodically the RRU of signal quality the best being updated to the service site of described travelling carriage.
Referring again to shown in Figure 4, as further improvement of this embodiment, described selected cell 31 comprises:
Obtain subelement 311, be used for when travelling carriage inserts, obtain signal quality and position group number information that each RRU of sub-district, described RRU place reports;
The first chooser unit 312 is used to select the RRU of signal quality the best, and its position group number is reported base station controller BSC as the service RRU position group number at described travelling carriage;
First determines subelement 313, is used to receive the service RRU position group number that BSC issues, and determines the service site that described travelling carriage is current according to described service RRU position group number.
As further improvement of this embodiment, described determining unit 32 comprises:
Broadcasting subelement 321 when being used for channel and activating, is broadcast to the service RRU position group number of the channel that is activated on all RRU;
Second determines subelement 322, is used for the service site of described service RRU position group number continuation as the channel that is activated.
As further improvement of this embodiment, described updating block 33 comprises:
Second obtains subelement 331, is used to obtain the signal quality data of the Filtering Processing that each RRU periodically reports;
The second broadcasting subelement 332, the position group number that is used for the RRU of the signal quality the best that will select is broadcast to all RRU as the position group number of service RRU.
As further improvement of this embodiment, also comprise:
Receiving element 34 is used to receive the data after demodulating that described service RRU sends.
Is foundation by present embodiment with signal quality (SNR), in conjunction with the technical scheme that the filtering smoothing algorithm selects to serve the site, greatly reduces because the uncertainty of wireless link causes selecting the possibility of wrong service site; Switch by periodicity (52 multi-frame) simultaneously and select the service site, select to serve the site efficiently and accurately, can avoid waste of network resources again for travelling carriage; Have only selected RRU just to send data, saved the CPRI transmission bandwidth; Thereby promoted network performance and user impression.
Please refer to shown in Figure 5, the embodiment of the invention four provides a kind of system of GSM circuit domain service station address selection, be used for multistation location district relay altogether, comprise first radio frequency remote unit RRU 41 and at least one second radio frequency remote unit RRU 42, a described RRU 41 is identical with Remote Radio Unit among the embodiment three, and this does not give unnecessary details; Described the 2nd RRU is used for signal quality data is reported a described RRU, and a described RRU selects the RRU of signal quality the best as the service site according to described signal quality data.Be to be understood that, present embodiment GSM circuit domain service station address selection system in, to be sub-districts, place report the general designation of the RRU of a RRU 41 with self signal quality data to the 2nd RRU 42, according to the configuration of sub-district, place, the 2nd RRU 42 can be one, also can be a plurality of.
Is foundation by present embodiment with signal quality (SNR), in conjunction with the technical scheme that the filtering smoothing algorithm selects to serve the site, greatly reduces because the uncertainty of wireless link causes selecting the possibility of wrong service site; Switch by periodicity (52 multi-frame) simultaneously and select the service site, select to serve the site efficiently and accurately, can avoid waste of network resources again for travelling carriage; Have only selected RRU just to send data, saved the CPRI transmission bandwidth; Thereby promoted network performance and user impression.
Use the method that apparatus of the present invention and system embodiment realize the GSM circuit domain service station address selection, similar substantially with the inventive method embodiment description, repeat no more herein.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (11)
1, a kind of method of GSM circuit domain service station address selection is used for multistation location district relay altogether, comprising:
When travelling carriage inserted, the radio frequency remote unit RRU of selecting signal quality the best was as described travelling carriage current service site;
When base station controller BSC activates the channel of described travelling carriage, with the RRU of aforementioned selection service site as the described channel that is activated;
Periodically the radio frequency remote unit RRU of signal quality the best is updated to the service site of described travelling carriage.
2, method according to claim 1 is characterized in that: when described travelling carriage inserted, selecting the radio frequency remote unit RRU of signal quality the best was its current service site, specifically comprises:
When travelling carriage inserted, main radio frequency remote unit RRU was obtained signal quality and the position group number information that described main RRU place each RRU of sub-district reports;
Main RRU selects the RRU of signal quality the best, and its position group number is reported base station controller BSC as the service RRU position group number at described travelling carriage;
Main RRU receives the service RRU position group number that BSC issues, and determines the service site that described travelling carriage is current according to described service RRU position group number.
3, method according to claim 1 and 2 is characterized in that: described when base station controller BSC activates the channel of described travelling carriage, with the RRU of aforementioned selection service site, specifically comprise as the described channel that is activated:
When channel activated, will the be activated service RRU position group number of channel of main RRU was broadcast on all RRU;
Main RRU is with the service site of described service RRU position group number continuation as the channel that is activated.
4, method according to claim 1 and 2 is characterized in that: the described service site that periodically radio frequency remote unit RRU of signal quality the best is updated to described travelling carriage specifically comprises:
Main RRU obtains the signal quality data of the Filtering Processing that each RRU periodically reports;
Main RRU selects the RRU of signal quality the best, and its position group number is broadcast on all RRU as service RRU position group number.
5, method according to claim 1 is characterized in that: also comprise:
Each RRU judges whether the service RRU position group number of upgrading is the self-position group number, if then confirm certainly as the location, service station;
Main RRU receives the data after demodulating that described service site sends.
6, a kind of Remote Radio Unit is characterized in that: comprising:
Selected cell is used for when travelling carriage inserts, and the radio frequency remote unit RRU of selecting signal quality the best is as described travelling carriage current service site;
Determining unit is used for when base station controller BSC activates the channel of described travelling carriage, with the RRU of the aforementioned selection service site as the described channel that is activated;
Updating block is used for periodically the RRU of signal quality the best being updated to the service site of described travelling carriage.
7, Remote Radio Unit according to claim 6 is characterized in that: described selected cell comprises:
Obtain subelement, be used for when travelling carriage inserts, obtain signal quality and position group number information that each RRU of sub-district, described RRU place reports;
The first chooser unit is used to select the RRU of signal quality the best, and its position group number is reported base station controller BSC as the service RRU position group number at described travelling carriage;
First determines subelement, is used to receive the service RRU position group number that BSC issues, and determines the service site that described travelling carriage is current according to described service RRU position group number.
8, according to claim 6 or 7 described Remote Radio Unit, it is characterized in that: described determining unit comprises:
The broadcasting subelement when being used for channel and activating, is broadcast to the service RRU position group number of the channel that is activated on all RRU;
Second determines subelement, is used for the service site of described service RRU position group number continuation as the channel that is activated.
9, according to claim 6 or 7 described Remote Radio Unit, it is characterized in that: described updating block comprises:
Second obtains subelement, is used to obtain the signal quality data of the Filtering Processing that each RRU periodically reports;
The second broadcasting subelement, the position group number that is used for the RRU of the signal quality the best that will select is broadcast to all RRU as service RRU position group number.
10, Remote Radio Unit according to claim 6 is characterized in that: also comprise:
Receiving element is used to receive the data after demodulating that described service site sends.
11, a kind of system of GSM circuit domain service station address selection, be used for multistation location district relay altogether, it is characterized in that: comprise as each described first radio frequency remote unit RRU among the claim 6-10, and at least one the 2nd RRU, described the 2nd RRU is used for signal quality data is reported a described RRU.
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| CN104202752A (en) * | 2014-09-18 | 2014-12-10 | 湖南华凯文化创意股份有限公司 | Method and system for adjusting sensing distances of Bluetooth base stations |
| CN104301270A (en) * | 2014-10-27 | 2015-01-21 | 大唐移动通信设备有限公司 | Received signal processing method and device applied to railway system |
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