CN101237612B - Code conversion system of voice signal and its voice signal transmission method - Google Patents
Code conversion system of voice signal and its voice signal transmission method Download PDFInfo
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Abstract
The invention discloses a code pattern transformation system of speech signal and a speech signal transmission method thereof, wherein the method comprises the following: step S202: one or more than one base station controller sends received speech signal to one or more than one code pattern converter resource pool; step S204: the code pattern converter resource pool carries out code pattern transformation of the speech signal and sends the transformed speech signal to the corresponding mobile service switching center of one or more than one mobile service switching center. An Ater-Flex interface and equipment are realized through adopting the invention. Compared with the prior art, the system and the method which realize the share of code pattern converter resource among a plurality of base station controllers save transmission resources.
Description
Technical field
The present invention relates to GSM mobile communication network field, relate in particular to voice code conversion system and speech signal transmission method thereof in the GSM mobile communication network.
Background technology
According to GSM900 and GSM1800 standard, bit rate in the air interface is 13Kbits/s, and is 64Kbits/s in the bit rate of mobile services switching centre (MSC) and PSTN (public switchedtelephone network public switched telephone network) interface.This means after BTS (Base Transceiver Station base station transceiver) received signal and before it is sent to other network, have to be transformed in certain node bit rate.Where conversion should not take place but standard limits definitely.Realization is called as TransCoder or TC, i.e. code pattern converter from the conversion of 13Kbits/s to 64Kbits/s and the actual hardware of inverse process thereof.In theory, this equipment belongs to the base station.Yet by TC being placed different places, we can reduce some benefits of acquisition on the transport overhead.
If TC (code pattern converter) is placed on nearly BTS limit (at the BSC interface), the user data rate of (BSC) will be 64Kbits/s from BTS to base station controller so.This transmission will be similar with the Standard PC M line transmission of each PCM (pulse code modulation Pulse Code Modulation) cable 30 channels, and same situation also can be applicable between BSC and the MSC.
At present be equipment vendor and operator to cost very sensitivity all, the demand that reduces relevant cost is very urgent.Need a kind of new mode improve its utilance for a large amount of TC resources of using in the gsm system and the transfer resource that takies.
In the present practical application networking, TC is generally between MSC and BSC, down direction with 64Kbit/s speech speed by 1: 4 or 1: 8 boil down to 16Kbit/s or 8Kbit/S, the lang sound of going forward side by side coding, up direction is converted to 64Kbit/s with voice rate and is sent to MSC by the A interface.
TC can adopt mode or the external mode that is built in BSC, at present basically all with built-in networking mode networking.Under this mode, in the BSC equipment of TC resources integration under it, can only be used by place BSC equipment, code conversion is finished in BSC inside, and MSC transmits with 64Kbit/s to the speech speed between the BSC.Because the deployment of MSC and BSC distance is generally all far, that is to say that this section is 4 times that eat dishes without rice or wine for taking of transmission bandwidth at least from BSC to MSC, also just need more transfer resource.
At present, it is that tc unit is physically separated with BSC that a kind of networking mode is arranged, and TC is external with the form of autonomous device, can save a large amount of transfer resources and take with the TC deployed with devices in the very near position of distance MSC like this.This mode networking solved the problem of transfer resource to a certain extent, but TC can only be used still by the BSC under it.Because the different time of telephone traffic of BSC, different zones is also unbalanced, and the TC resource generally will be according to configuration at full capacity, and for relatively expensive TC resource, utilance is not very high, has waste to a certain degree.
European patent WO0191481A1 has proposed a kind of the use and has simplified the method that BSC comes networking, this patent is delivered MSC with all mobile functions of exchange and is handled, BSC only realizes comprising other household functions of code conversion, can not reach saving transfer resource of the presently claimed invention and realize the purpose that TC shares.
Therefore, need the solution of a kind of voice signal code conversion system and data transmission method thereof, can solve the problem in the above-mentioned correlation technique.
Summary of the invention
The present invention be intended to overcome the transfer resource that exists in existing GSM networking mode and the technology take big and the TC resource can not be between BSC sharing problem and defective, introduce Ater Interface, a kind of TC resource pool (TCPool) equipment is provided, realize Ater-Flex.
According to an aspect of the present invention, a kind of code conversion system of voice signal is provided, comprise a plurality of base station controllers and one or more mobile services switching centre, also comprise: one or more code pattern converter resource pools, each code pattern converter resource pool is connected to a plurality of base station controllers, be used for the voice signal from a plurality of base station controllers is carried out code conversion, and the voice signal after the conversion is sent to corresponding mobile service switching center in one or more mobile services switching centres.
In one or more code pattern converter resource pools each includes: control module, and the code pattern converter unit allocation request message, the answer code code converter unit allocation request message that are used to receive from a plurality of base station controllers come voice signal to be carried out code conversion and controls voice signal transmit between a plurality of base station controllers and one or more mobile services switching centre for voice signal assigned code code converter unit, control code code converter unit; Interface module, comprise first interface module with a plurality of first interfaces and second interface module with a plurality of second interfaces, a plurality of base station controllers are connected to one or more code pattern converter resource pools by a plurality of first interfaces and one or more code pattern converter resource pool is connected to one or more mobile services switching centres by a plurality of second interfaces; A plurality of code pattern converters unit is used for voice signal is carried out code conversion; And connecting module, be used for coming voice signal to be routed to a plurality of code pattern converters unit, and will output to a plurality of second interfaces through the voice signal after the unit conversion of a plurality of code pattern converters by a plurality of first interfaces according to the indication of control module.
First interface module is the Ater Interface module, and second interface module is the A interface module; And first interface be Ater Interface, and second interface is the A interface.
Wherein, the A interface only provides repeat circuit, and Ater Interface is supported the bearing mode of E1, STM-1 and IP.
According to another aspect of the present invention, provide a kind of speech signal transmission method that is used for said system, may further comprise the steps: step S202, a plurality of base station controllers are sent to one or more code pattern converter resource pools with the voice signal that receives; And step S204, one or more code pattern converter resource pools carry out code conversion to voice signal, and the voice signal after the conversion is sent to corresponding mobile service switching center in one or more mobile services switching centre mobile services switching centres.
Step S202 may further comprise the steps: after a plurality of base station controllers receive voice signal, to one or more code pattern converter resource pool request code code converter resources; One or more code pattern converter resource pools come to be voice signal assigned code code converter resource according to the type of service of its current code pattern converter resource operating position and voice signal; And a plurality of base station controllers are sent to voice signal the code pattern converter resource of being distributed.
Step S204 may further comprise the steps: the code pattern converter resource of being distributed is carried out code conversion to voice signal, is transformed to second speed with the transmission rate with voice signal from first rate; And the voice signal of one or more code pattern converter resource pools after with conversion is sent to corresponding mobile service switching center in one or more mobile services switching centres.
In the method, first rate is 16Kbit/s or 8Kbit/s, and second speed is 64Kbit/s.
The Ater-Flex interface and the equipment that adopt the present invention to realize are compared with common technology, and the present invention is by increasing TCPool equipment newly, support that a BSC is linked into a plurality of TCPool, a TCPool can insert a plurality of BSC, has realized Ater-Flex, has increased the reliability of system; By introducing Ater Interface, saved the transfer resource of A interface, realized that the TC resource is shared between a plurality of BSC, improved the utilance of TC resource.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the block diagram according to voice signal code conversion system of the present invention;
Fig. 2 shows the flow chart that is used for the speech signal transmission method of voice signal code conversion system according to of the present invention;
Fig. 3 shows the block diagram according to the TCPool of the embodiment of the invention; And
Fig. 4 shows the flow chart of speech signal transmission method according to an embodiment of the invention.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Fig. 1 shows the block diagram according to voice signal code conversion system of the present invention.With reference to Fig. 1, voice signal code conversion system according to the present invention comprises: comprise one or more base station controllers 102 and one or more MSC 106, this system also comprises: one or more TCPool 104, be used for the voice signal from one or more base station controllers is carried out code conversion, and the voice signal after the conversion is sent to corresponding M SC among one or more MSC.
Among one or more TCPool each includes: control module, be used to receive tc unit allocation request message from one or more base station controllers, in response to the tc unit allocation request message come for voice signal distribution T C unit, voice signal is carried out code conversion to the control tc unit and the control voice signal transmits between one or more base station controllers and one or more MSC; Interface module, comprise first interface module with a plurality of first interfaces and second interface module with a plurality of second interfaces, one or more base station controllers are connected to one or more TCPool by a plurality of first interfaces and one or more TCPool is connected to one or more MSC by a plurality of second interfaces; A plurality of tc units are used for voice signal is carried out code conversion; And connecting module, be used for coming voice signal to be routed to a plurality of tc units, and will output to a plurality of second interfaces through the voice signal after a plurality of tc unit conversion by a plurality of first interfaces according to the indication of control module.
First interface module is the Ater Interface module, and second interface module is the A interface module, and first interface is an Ater Interface, and second interface is the A interface.
Wherein, the A interface only provides repeat circuit, and Ater Interface is supported the bearing mode of E1, STM-1 and IP.
Fig. 2 shows the flow chart that is used for the speech signal transmission method of voice signal code conversion system according to of the present invention.With reference to Fig. 2, this speech signal transmission method may further comprise the steps: step S202, and one or more base station controllers are sent to one or more TCPool with the voice signal that receives; And step S204, one or more TCPool carry out code conversion to voice signal, and the voice signal after the conversion is sent to corresponding M SC among one or more MSC.
Step S202 may further comprise the steps: after one or more base station controllers receive voice signal, to one or more TCPool request TC resources; One or more TCPool come the resource for voice signal distribution T C according to the type of service of its current TC resource operating position and voice signal; And one or more base station controllers are sent to voice signal the TC resource of being distributed.
Step S204 may further comprise the steps: the TC resource of being distributed is carried out code conversion to voice signal, is transformed to second speed with the transmission rate with voice signal from first rate; And the voice signal of one or more TCPool after with conversion is sent to corresponding M SC among one or more MSC.
In the method, first rate is 16Kbit/s or 8Kbit/s, and second speed is 64Kbit/s.
Below in conjunction with Fig. 1～Fig. 3 one embodiment of the present of invention are described.
In this embodiment, according to present network presence, introduced a kind of external TC equipment that a large amount of all kinds code pattern converters are provided, be code pattern converter pond (TransCoderPool, hereinafter to be referred as TCPool), TC resource in the pond is distributed dynamically, and for each BSC that is connected on the TCPool shares use, the interface between TCPool and the BSC is called Ater Interface at this moment.Operator can come construction network with the BSC of low capacity (not being with TC) in remote area, and the place of jumbo TCPool centre city near MSC, so not only reduced the transmission cost at construction network from far-off regions, the TC resource can also accomplish that the overall situation is shared between a plurality of BSC.And can be connected to a plurality of TCPool for BSC on Ater Interface, the Ater Interface of TCPool also supports a plurality of BSC network elements to insert, and realizes Ater-Flex.
With reference to Fig. 1, in this embodiment, the system that is used for phonetic modification comprises BSC, three parts of TC resource pool and MSC, and wherein BSC does not contain the TC resource, supports to insert a plurality of TCPool, and MSC is identical with the MSC of existing network.TCPool is a newly added equipment, and it is mainly by form (as shown in Figure 3) with lower module:
Control module 304, the responsible TC resource request that receives BSC, allocation manager TC resource, the control tc unit is finished the code conversion of voice, and the transmission of control Media Stream between MSC and BSC;
Interface module comprises Ater Interface module 310 and A interface module 312, docks with BSC and MSC respectively;
TC resource pool 308 is responsible for finishing the code conversion of voice;
Connecting module 306 is responsible for Media Stream is finished connection between each interface according to the indication of control module;
Wherein the Ater Interface of TCPool equipment supports a plurality of BSC network elements to insert, and BSC supports to insert a plurality of TCPool, has realized Ater-Flex, and A interface control section is still provided by BSC, supports to insert a plurality of MSC, and the A interface on the TCPool only provides repeat circuit.Present embodiment has been simplified the processing of BSC to a certain extent, and compatible with the system specifications of GSM fully.The processing procedure of whole speech business may further comprise the steps (as Fig. 4):
Step S402, BSC are after receiving speech business, by the control module 304 request TC resources of Ater Interface module 310 to TCPool;
Step S404, certain the submodule C1 320 that is responsible for this BSC business in the control module are according to the resource situation of current TCPool and the type of service of being applied for, indexed resource administration module 302 distributes corresponding TC resource;
Step S406, resource management module 302 return the TC resource identification of distribution;
Step S408, control submodule C1 320 specify BSC speech to be linked on the port of Ater Interface 314 of distribution;
Step S410, indication connecting module 306 is linked into speech in the tc unit of distribution to be handled, as certain subpool TC1 322 of TC resource pool 308;
Step S412, the code stream after control submodule C1 320 indication connecting modules 306 will be changed TC output on certain A mouth 316 relaying of A interface module 312 of appointment, and MSC sent in voice.
Below in conjunction with accompanying drawing an enforcement of the present invention is described in further detail.
With reference to Fig. 1 as can be seen, group network system of the present invention is by a plurality of BSC 102, and a plurality of TCPool 104 and a plurality of MSC 106 have formed a topological structure of supporting Ater-Flex.A plurality of BSC are connected to MSC by TCPool.Consider internet security, realize backup and load sharing mutually between a plurality of TCPool, TCPool also supports to be connected to a plurality of MSC, has so just constituted the structure of TCPool in POOL, MSC in POOL.
With reference to Fig. 3, in the composition of TCPool, resource management module 302 is responsible for the management of the TC resource of whole TCPool, control module 304 is made up of a plurality of sub-control modules, be responsible for receiving the resource bid request that Ater comes, to resource management module 302 application TC resource and Ater Interface resources, resource management module 302 carries out resource allocation according to the TC resource operating position of TC resource pool 308 and the operating position of Ater Interface resource, return to control module 304, a sub-control module of control module 304 is according to the resource of distributing, and A interface 316 resource informations that transmit of Ater Interface 314, the notice connecting module is routed to TC with the speech code stream from Ater Interface 314 and handles, and the code stream after will handling is routed to the A interface, delivers to corresponding M SC.The dispose procedure of speech channel and related resource is identical with it, be corresponding process be that resource discharges and the disconnection process of speech channel.
For this networking mode can normally effectively be moved, need handle BSC well, interface bearing mode between TCPool and the MSC, the realization of Ater-Flex, the communication channel between the three and the selection of speech channel, the detection of failure path and processing, the processing of the switching of faulty channel and fault speech channel, the problem of several aspects such as load balancing processing of the management of TC resource and conflict processing and TCPool.
The bearing mode of interface
The interface of considering should have high efficiency of transmission, and the network standard that meet gsm system is arranged, and is different in the selection of interface bearing.Ater Interface 118 among Fig. 1 can be supported multiple bearing mode owing to be the internal interface of system, comprises E1, usual ways such as STM-1 and IP.A interface 120 is subjected to the restriction of GSM network standard as standard interface, is still the PCM circuit carrying of 64K, does not need to support IP.
The realization of Ater-Flex
BSC and TCPool are independent network element equipment among the present invention, all distribute sign unique a system in for each BSC and ITC, and this sign can be brand-new distribution, also can use the office direction between Signaling System 7(SS-7) number to do sign.BSC and the TCPool that each is belonged to set up communication link, TCPool inside to each communication channel all by a sub-control module management (see among Fig. 3 304 form), BSC can be according to the TCPool of this service access of policy selection of oneself, and TCPool manages the business realizing that each BSC inserts by the network element ID that carries on the channel.
BSC, the communication link between TCPool and the MSC and the selection of speech channel
Under this networking model, BSC equipment does not dispose the TC resource, but to the TCPool application that it connected, its speech also must be through the TCPool transmission.Because each BSC can receive a plurality of TCPool, it all promptly has signaling link to have speech channel to connect again with the TCPool that links to each other.Current business should to which TCPool application TC resource, and which TCPool speech channel is routed to all needs decision-making.According to the standard of GSM, also in order to reduce the complexity of system handles, the circuit that the A interface uses is by the MSC decision simultaneously, and MSC adopts in the method for poll and distributes available A interface circuit according to the BSC sign of bearer service.BSC is according to the circuit indication of MSC, and the TCPool that enquiry circuit belonged to initiates resource bid to it, TCPool distribution T C resource, and the Ater Interface resource, and finish speech channel at Ater Interface, continuing between TC and the A interface.
The detection of failure path and processing
BSC under this networking model, the communication link between TCPool and the MSC adopt the method for shaking hands to realize the detection of fault.The signaling link aspect, fault between the Ater is detected by regularly shaking hands by BSC and TCPool, fault between the A interface is replied in case continuous several times can not receive shaking hands of the other side by the detection of regularly shaking hands between BSC and the MSC, then judges this communication link fault.In case the whole faults of link of certain TCPool are led in judgement, the associated transport resource that then will put the A interface is unavailable, notifies MSC simultaneously for BSC, avoids the MSC mistake to distribute.
The processing of the switching of faulty channel and fault speech channel
Under this networking model,,, can switch to the good TCPool of link immediately and go up processing in case find certain bar link failure owing to realized Ater-Flex.As can be seen from Figure 3, switch for fear of frequent TCPool, the control module 304 of TCPool is made up of the experimental process control module, each sub-control module is set up communication link with the BSC of some respectively, each BSC can with a plurality of sub-control module configuration multiple communication links of certain TCPool.In most cases, handle on professional other sub-control modules that can switch to same TCPool after the communication link fault.After breaking down, originally the business of initiating by faulty link must obtain discharging, and at first the relevant sub-control module of notice is responsible for discharging related resource by sub-control module.If transfer resource breaks down, the user will experience in the very first time, and initiatively discharge, and system needn't special processing.
The management of TC resource and conflict are handled
Under this networking model, TCPool is a TC resource pool that capacity is huge, in order to reach between all BSC the purpose that the overall situation is shared, and can not influence the efficient of processing again, and TCPool has adopted a kind of distribution type processing method.As can be seen from Figure 3, TC resource pool 308 can be divided into a plurality of sub-TC resource pools according to the type of service of physical configuration or processing, the different sub-control module of each subpool ownership.During resource management module 302 Resources allocation, the resource of the subpool under the sub-control module of priority allocation application resource.
Because resource management is finished by module independently, has avoided resource status inconsistent situation between each module, also just avoided taking place the possibility of resource contention.
The load balancing of TCPool is handled
TCPool is as the key equipment in this networking, and the control of its load is very important.
One side is the interior method that adopts distributed treatment of equipment in design, controlling and processing services is divided into a plurality of sub-control modules, the communication link that will link to each other with each BSC disperses to be based upon on each sub-control module, and the business that certain bar link is initiated is only by the resume module that is connected.BSC is when initiating business simultaneously, and it is professional to adopt simple polling method or other strategies to initiate on each link selectively, has so just realized evenly distribution of load, has also reduced the risk of the system failure.
On the other hand, when TCPool detects the overload of oneself, when perhaps the business of certain bar link is too much, can send professional control command to corresponding BSC, indication the other side controls the service traffics of this link, treats that reinforming the other side after load descends removes control.
By above-mentioned disclosed technical scheme as seen, the present invention increases TCPool equipment, has realized the Ater-Flex interface, has reached the saving transfer resource, improves the utilance of TC resource, increased the purpose of the reliability of system, is a kind of advanced person, real possible technique.
The Ater-Flex interface and the equipment that adopt the present invention to realize are compared with common technology, and the present invention is by increasing TCPool equipment newly, support that a BSC is linked into a plurality of TCPool, a TCPool can insert a plurality of BSC, has realized Ater-Flex, has increased the reliability of system; By introducing Ater Interface, saved the transfer resource of A interface, realized that the TC resource is shared between a plurality of BSC, improved the utilance of TC resource.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the code conversion system of a voice signal comprises a plurality of base station controllers and one or more mobile services switching centre, it is characterized in that, also comprises:
One or more code pattern converter resource pools, each described code pattern converter resource pool is connected to a plurality of described base station controllers, be used for the voice signal from described a plurality of base station controllers is carried out code conversion, and the described voice signal after the conversion is sent to corresponding mobile service switching center in described one or more mobile services switching centre;
Wherein, each in described one or more code pattern converter resource pool includes:
Control module, the code pattern converter unit allocation request message, the described code pattern converter of the response unit allocation request message that are used to receive from described a plurality of base station controllers come described voice signal to be carried out code conversion and control described voice signal transmitting between described a plurality of base station controllers and described one or more mobile services switching centre for described voice signal assigned code code converter unit, the described code pattern converter of control unit;
Interface module, comprise first interface module with a plurality of first interfaces and second interface module with a plurality of second interfaces, described a plurality of base station controllers are connected to described one or more code pattern converter resource pool by described a plurality of first interfaces and described one or more code pattern converter resource pool is connected to described one or more mobile services switching centre by described a plurality of second interfaces;
A plurality of code pattern converters unit is used for described voice signal is carried out code conversion; And
Connecting module, be used for coming described voice signal to be routed to described a plurality of code pattern converters unit, and will output to described a plurality of second interface through the described voice signal after described a plurality of code pattern converters unit conversion by described a plurality of first interfaces according to the indication of described control module.
2. system according to claim 1 is characterized in that, described first interface module is the Ater Interface module, and described second interface module is the A interface module.
3. system according to claim 2 is characterized in that, described first interface is an Ater Interface, and described second interface is the A interface.
4. system according to claim 3 is characterized in that, described A interface only provides repeat circuit.
5. system according to claim 3 is characterized in that, described Ater Interface is supported the bearing mode of E1, STM-1 and IP.
6. a speech signal transmission method that is used for each described code conversion system of claim 1 to 5 is characterized in that, may further comprise the steps:
Step S202, a plurality of base station controllers are sent to the voice signal that receives the code pattern converter resource of being distributed, wherein, described step S202 may further comprise the steps: after described a plurality of base station controllers receive described voice signal, to one or more code pattern converter resource pool request code code converter resources; Described one or more code pattern converter resource pool comes to be described voice signal assigned code code converter resource according to the type of service of its current code pattern converter resource operating position and described voice signal; And described a plurality of base station controller is sent to described code pattern converter resource of distributing with described voice signal; And
Step S204, described code pattern converter resource of distributing is carried out code conversion to described voice signal, and the described voice signal after the conversion is sent to corresponding mobile service switching center in one or more mobile services switching centres.
7. method according to claim 6 is characterized in that, described step S204 may further comprise the steps:
The code pattern converter resource of being distributed is carried out code conversion to described voice signal, is transformed to second speed with the transmission rate with described voice signal from first rate; And
The described voice signal of described one or more code pattern converter resource pool after with conversion is sent to corresponding mobile service switching center in described one or more mobile services switching centre.
8. method according to claim 7 is characterized in that, described first rate is 16Kbit/s or 8Kbit/s, and described second speed is 64Kbit/s.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143442A (en) * | 1994-03-09 | 1997-02-19 | 诺基亚电信公司 | Mobile communication system and call control method |
| WO1997046035A3 (en) * | 1996-05-31 | 1997-12-31 | Ericsson Telefon Ab L M | Ussd-scheduler in msc |
| CN1276134A (en) * | 1997-10-16 | 2000-12-06 | 诺基亚网络有限公司 | Mobile communications system and transcoder unit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143442A (en) * | 1994-03-09 | 1997-02-19 | 诺基亚电信公司 | Mobile communication system and call control method |
| WO1997046035A3 (en) * | 1996-05-31 | 1997-12-31 | Ericsson Telefon Ab L M | Ussd-scheduler in msc |
| CN1276134A (en) * | 1997-10-16 | 2000-12-06 | 诺基亚网络有限公司 | Mobile communications system and transcoder unit |
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