CN1332941A - Data transmission method between base station and mobile switching center - Google Patents

Data transmission method between base station and mobile switching center Download PDF

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Publication number
CN1332941A
CN1332941A CN99815359A CN99815359A CN1332941A CN 1332941 A CN1332941 A CN 1332941A CN 99815359 A CN99815359 A CN 99815359A CN 99815359 A CN99815359 A CN 99815359A CN 1332941 A CN1332941 A CN 1332941A
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data
individuality
ttl
data message
base station
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CN99815359A
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B·舍奎斯特－艾利松
I·约翰松
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Abstract

The present invention provides a system and method for merging packet data, speech and fax/modem communications within the same communication protocol. According to exemplary embodiments of the present invention, the unused mode code values of a conventional TTL frame are tailored so as to allow for the integration of packet data together with speech and fax/modem in a TTL frame. As a result, communication resources are more efficiently utilized.

Description

Data transmission method between base station and the mobile switching centre
Background of invention
The present invention relates in general to wireless communication system, and specially refers in low-cost mode the system and method for integrated speech, fax/modem and grouped data.
The growth at full speed of the growth of business communications system, particularly cellular radiotelephone system forces system designer to go to seek a kind of method, can either improve power system capacity, can not make communication quality be reduced to the user again and tolerate below the limit degree.Meanwhile, the user has used transfer of data (rather than voice transfer) mobile communication equipment more and more at large.Can send and receive e-mail and can utilize web browser to realize the access of World Wide Web (WWW), this is the business that the user often discusses, and also the desired wireless communication system can provide this business.For this being made response, require communication system designer will find a kind of method, can send to the mobile subscriber to data message effectively, perhaps from mobile subscriber's receiving data information.
Have essential difference between data communication and the voice communication.For example, voice communication to the requirement of time delay than higher (promptly requiring is real time business), and data communication to the accuracy requirement of transmission than higher, and can reduce relatively the requirement of time delay.Packet data protocol is applicable to the transmission data more than circuit switched protocol, and packet data protocol has begun to seek the method that it incorporates cellular communication system.In order to handle frequent low discharge business or burst service (for example those business relevant) with internet browsing, require packet switching network preferably can provide mobile pocket data business, this business can be defined by following standard: for example GPRS (GPRS), Cellular Digital Packet Data (CDPD) and personal digital cellular system (PDC).Not as circuit switched data services, mobile pocket data business does not also require appointment use particular radio resource.For example in the GPRS standard, all include destination address in each packet, be used to set up short calling, and allow a plurality of users to enjoy Radio Resource jointly.
In global mobile communication cellular system (GSM) and digital senior mobile phone cellular system (D-AMPS), the integrated standardisation process that carrying out of Packet Service.At present, gsm system can provide circuit switched data services, and this business can be used to connect outer data network.In order to make packet switched data communication more effective, need in gsm system, introduce a kind of new packet switched data service that is referred to as GPRS (GPRS), as a part of gsm system.Because GPRS is a kind of business in the gsm system, therefore may use part GSM structure.In 300 574 kinds of these parts of having described gsm communication system of the document ETS of ETSI (ETSI), be incorporated herein as reference.
GPRS can allow packet switching communication, and can support connectionless protocol (for example IP) and Connection-oriented Protocol (for example X.25).Each channel all is arranged to circuit switching or packet switching service.Adopt a benefit of packet switched data communication to be: a plurality of users can share single transfer resource.So for example in the GSM cellular system, a time slot of radio-frequency carrier can offer several mobile subscribers and use, and realizes the transmission and the reception of data.For the transmission of down link and up link, shared transfer resource all will be subjected to the management of cellular system networks one side.
Fig. 1 has illustrated in a kind of gprs system employed, can support circuit-switched and the demonstration radio frequency band of packet switching service.By shown in Figure 1, this demonstration radio frequency band can be divided into 8 time slots.A time slot can be supported an audio call, and a fax/modem is called out perhaps one or more packet data users.For example time slot 1 is assigned to audio call 1, and time slot 2 can be shared by GPRS user 1-3.
Because GPRS can allow integrated speech and Packet data service on single carrier wave, so GPRS is very flexibly.Yet its desired bandwidth will be higher than other block data system significantly.GPRS requires the 25KHz/ time slot, and other system (for example CDPD) only requires the 10KHz/ time slot.
Be different from above-mentioned method, all proposed the different schemes that block data communication is provided as the cdpd system and the PDC system of a D-AMPS part.In cdpd system, specific base stations is dedicated to handle packet data transmission.Like this, voice and Packet data service just can not be mixed together.In the PDC system, comprise in the base station that independent being used to handle the transceiver of block data communication.In cdpd system, voice and Packet data service can not be mixed together yet like this.
Provide the conventional method of grouped data can not be effectively together grouped data, voice and fax/modem business integration.In the trial that grouped data and voice communication are provided, need to specify special base station, transceiver and channel to be used to handle packet data transmission in the legacy system.Resulting like this result is: can not effectively utilize the communication resource.And since the cost that takies transmission channel normally than higher, so the cost that these conventional methods can not the reduction system.
Therefore there is a kind of like this requirement:, realize the integrated of voice, fax/modem and block data communication promptly in low-cost mode.
Summary of the invention
The present invention seeks to overcome top pointed shortcoming by be provided for the system and method that integrated grouped data, voice and fax/modem are communicated by letter in same communication protocol.According to example embodiment of the present invention,, need make amendment to the schema code value that was not used in traditional TTL frame in order to allow integrated grouped data and voice, fax/modem information in a TTL frame.So just can effectively utilize the communication resource more.
The accompanying drawing summary
With reference to the accompanying drawings,, can see above-mentioned purpose of the present invention and feature more significantly according to the description of preferred embodiment subsequently, wherein:
Fig. 1 illustrates in the gprs system, the demonstration radio frequency band of support circuit-switched and packet switching service;
Fig. 2 illustrates traditional PDC wireless communication system;
Base station 210 and MSC220 that Fig. 3 provides in the key diagram 2 in further detail;
Fig. 4 illustrates traditional TTL frame, wherein can comprise voice and/or transmission/3com modem information 3Com or packetized digital information; And
Fig. 5 illustrates base station and MSC according to example embodiment of the present invention.
Describe in detail
In description subsequently, in order to understand the present invention all sidedly, need mention some specific detail, for example particular electrical circuit, electric circuit element, technology or the like, but this only is for purposes of illustration, rather than for restriction purpose of the present invention.Yet clearly, concerning those skilled in the art, among the present invention embodiment that can be implemented in other, that break away from these specific detail.In other situation, for causing, obscures the description of this invention not, can dispense the detailed description of some accepted method, equipment and circuit.
Can be described to adopt TRA-TRX link (TTL) agreement in this exemplary wireless communications systems of discussing, wherein realize communicating by letter between base station and the mobile services switching centre by the TTL frame.Yet those skilled in the art are appreciated that notion described herein is applicable to other agreement too.Similarly, can provide the exemplary case of relevant PDC system in some example embodiment, yet technology described herein goes for any intrasystem wireless base station too.
Fig. 2 has illustrated traditional PDC wireless communication system.In Fig. 2, comprise a plurality of travelling carriages (MS) 200 in the legacy system 1-200 N, 210, one mobile switching centres in a base station (BS) (MSC) 200 are connected to the grouping mobile services switching centre (PMSC) 230 on the packet network (for example internet), and public switch telephone network (PSTN) 240.In operating process, a plurality of travelling carriages 200 1-200 NCommunicate with base station 210 in known manner.Each travelling carriage 200 1-200 NCan both send voice, fax/modem data with and/or grouped data.Base station 210 is handled this information, and treated information forward direction is sent to MSC 220 by the information of transceiver reception from travelling carriage.It will be appreciated by those skilled in the art that base station 210 also can receive the information from MSC 220, and this information is passed to one or more travelling carriages.According to this legacy system, can comprise independent transceiver in the base station, be used for processed voice independently and communicate by letter, and be used to handle block data communication with fax/modem.
At MSC220, information from base station 210 is sent to its destination address (promptly when information is voice or fax/modem data by route, this target is PSTN240, and when information is grouped data, then will arrive the destination of Packet Data Network 250 by PMSC230).It will be appreciated by those skilled in the art that, can also typically comprise other parts in the network illustrated in fig. 2, router (not shown) for example, this router help to receive, handle and send the information in the network.And given components number only is the purpose in order to simplify among Fig. 2.Usually can comprise a plurality of base stations, MSC, PMSC or the like in the wireless communication system.
Fig. 3 has illustrated base station 210 and MSC220 given among Fig. 2 in further detail.In Fig. 3, comprise two transceiver TRX212 and TRX213 in the base station 210, respectively by antenna 215 and 216, from travelling carriage 200 1-200 NReception information or send information to travelling carriage.One of them transceiver (for example TRX212) is only handled block data communication, and another transceiver (TRX213) processing comprises communicating by letter of voice and fax/modem transmission.Base station 210 also comprises control unit (CU) 214, is used for the route of the information on the circuit 250 between control connection base station 210 and the MSC220.
Comprise a code converter and rate adaptor plate (TRAB) 222 in the MSC220, wherein handle the received information of MSC220 according to known mode.TRAB222 is relevant with transceiver 213.Like this, TRAB222 processed voice and modem/fax information, and transmit the information that receives from PSTN240.On the other hand, TRX212 is not relevant with TRAB.Like this, TRX212 is directly connected to PMSC230.MSC220 also comprises exchange terminal circuit 221,224 and 225, and these circuit can be used for data passes to its appropriate purpose ground as switch.Those skilled in the art are appreciated that, exemplary base station and MSC generally can comprise more parts (more than parts illustrated in fig. 3), and these parts help reception, transmission and the processing of information.
As noted above, comprise in the base station 210 that is used for the transceiver TRX213 that processed voice is communicated by letter with fax/modem, and the transceiver TRX212 that is used to handle block data communication.Transceiver 212 and 213 communicates with MSC by circuit 250.Communication between TRX213 and the TRAB222 need utilize the TTL agreement.(10/15 14-ANT 244 02 has described this TTL agreement in Rev.A), is incorporated herein as reference, sees appendix A at the document that is entitled as " signal description, the TRA-TRX of band IMUX/HR ".On the other hand, the communication between TRX212 and the PMSC230 can be used different agreement (after this as " legacy packets data protocol ").This protocol requirement possesses independent channel on circuit 250.
Fig. 4 has illustrated traditional TTL frame, wherein can comprise voice and/or fax/modem information.In Fig. 4, comprise frame head (comprising synchronizing information), two subframes and tail frame (tail frame) in traditional TTL frame.Comprise the individual and extension field of three TTL in each subframe.Term " TTL individuality " is used to identify the TTL resource of distributing to specific T RX and TRAB group.Each TTL individuality comprises a data field and a control domain.As mentioned above, all comprise voice and/or fax/modem information in each data field in particular frame.Intraindividual each control domain of TTL all comprises following subdomain: quality information subdomain, virtual data indication subdomain, schema code subdomain and Cyclic Redundancy Check subdomain.
Say on the traditional sense, utilize the schema code subdomain to go to identify/distinguish dissimilar and business different rates in the TTL agreement.Traditional schema code subdomain is provided in following table 1.As shown in Table, do not use schema code value 8-14 in traditional TTL agreement.Therefore, these values can be used to revise the TTL agreement, for following professional the use.
Table 1
Code value Code Code purpose
????0 ????0000 Do not use
????1 ????0001 Standby code
????2 ????0010 The A-S/FR pattern
????3 ????0011 The A-S/HR pattern
????4 ????0100 The T-C/FR pattern
????5 ????0101 Be preserved for " T-C/HR pattern "
????6 ????0110 The N-S/FR pattern
????7 ????0111 Be preserved for " N-S/FR pattern "
????8 ????1000 Standby code
????9 ????1001 Standby code
????10 ????1010 Standby code
????11 ????1011 Standby code
????12 ????1100 Standby code
????13 ????1101 Standby code
????14 ????1110 Standby code
????15 ????1111 Bell idles
In table 1, " A-S/FR " represents voice activated full-rate mode, " A-S/HR " represents voice activated half-rate mode, " T-C/FR " expression connects full-rate mode, " T-C/HR " expression connects half-rate mode, " N-S/FR " expression non-voice full-rate mode, and " N-S/HR " expression non-voice half-rate mode.
As implied above, traditional TTL agreement can not be provided at the ability of interior integrated speech of single TTL frame and packetized digital information.Like this, the TTL frame just can only be dedicated to voice and/or fax/modem information, thereby causes transceiver and TRAB also only can be dedicated to voice and/or fax/modem information.It will be appreciated by those skilled in the art that,, when promptly traditional TTL frame is sent out, may have idle TTL individuality in the frame in addition, will waste the valuable communication resource like this because therefore this restriction can exist following situation.For example consider following situation, send voice messaging (it can take the data field of four TTL individualities) and grouped data (its inromation bandwidth satisfies the data field of two TTL individualities just) from the base station to MSC.Utilize traditional TTL agreement, voice messaging can for example transmit in the TTL individuality 0,1,3 and 4 in the TTL frame, and it is unoccupied to stay TTL individual 2 and 5.Even grouped data can be transmitted in the data field of two TTL individualities, take TTL individual 2 and 5, tradition TTL agreement also can be refused packet data transmission, and requires to utilize the channel of independent MSC to BS, transmits grouped data through the legacy packets data protocol.
In wireless communications environment, tradition provides the trial of block data communication needing can cause certain base station, transceiver or channel to be used to handle this communication like this.These conventional methods can not effectively be utilized the communication resource.The present invention can provide the method and system of integrated speech, fax/modem and block data communication in low-cost mode.
Fig. 5 illustrates base station 310 and MSC320 according to example embodiment of the present invention.As shown in the figure, comprise two transceiver TRX312 and TRX313 in the base station 310, they respectively by antenna 315 and 316 and one or more travelling carriage communicate.According to the present invention, two transceivers 312 and 313 can both be handled grouped data, voice and fax/modem and communicate by letter.Be similar to the illustrated system of top Fig. 3, the transmission of the information on the circuit 250 of control unit (CU) 314 control connection base stations 310 and MSC320.Comprise two code converters and rate adaptor plate, TRAB322 and TRAB323 among the demonstration MSC320.According to the present invention, TRAB322 and TRAB323 can handle grouped data, voice and fax/modem information.Like this, each TRAB is connected to PMSC230 and PSTN240.For voice above-mentioned and/or fax/modem transmission, TRAB comes process information according to known mode.On the other hand, for packet data transmission, TRAB is delivered to its desired destination address to data by route simply.Can revise traditional TRAB, by software programming, the function of being mentioned above carrying out.
Be similar to traditional system, utilize the TTL agreement to communicate between base station 310 and the MSC320.Yet according to the present invention, the TTL agreement allows grouped data, voice and fax/modem are integrated in the single time slot.The present invention utilizes the schema code value 8-13 that is not used in the individual control domain of TTL to remove to indicate packetized digital information.The new model code value 8-13 of explanation TTL agreement in the table 2.
Table 2
Code value Code Code purpose
????8 ????1000 Indicate this grouping neither, also in this TTL individuality, do not finish from this TTL individuality
????9 ????1001 The indication grouped data is individual from this TTL
????10 ????1010 The indication grouped data finishes (comprising the message end pointer in 8 bits of numerical value meaning minimum in this TTL individuality) in this TTL individuality
????11 ????1011 The indication grouped data begins in this TTL individuality, and finishes (comprising the message end pointer in 8 bits of numerical value meaning minimum in this TTL individuality)
????12 ????1100 The end of a packet data message of indication, and the beginning of another grouped data
????13 ????1101 The beginning and the knot of a packet data message of indication
After the bundle, follow the beginning that makes a packet data message
It will be appreciated by those skilled in the art that the schema code that provides above only for the purpose of demonstration, and in order to satisfy the particular network demand, should remove to revise schema code according to other mode.
Benefit of the present invention has been described in the example subsequently.Suppose that once more the base station will send voice messaging (taking the data field of four TTL individualities) and grouped data (its inromation bandwidth takies the data field of two TTL individualities) to MSC.According to conventional art, voice messaging and grouped data must be transmitted in the BS channel at independent MSC, wherein comprise a pair of TRAB-TRX group in voice transfer, comprise another one TRX in packet data transmission.Yet, need utilize single TRX-TRAB group and single MSC to go to send voice messaging and grouped data to the BS channel according to the present invention.And the TTL agreement made amendment, can allow grouped data in a TTL frame, be transmitted with voice and/or fax/modem information.Such result is to effectively utilize the valuable communication resource more.
Be used for integrated grouped data, voice are communicated by letter with fax/modem in single TTL frame said system and method, can implement in low-cost mode at an easy rate.The integrating process of these grouped data/voice/fax/modem can be realized by the method for software programming, and not needed to change hardware component.Communicate by letter with fax/modem by integrated grouped data, voice in a TTL frame, the present invention can use inromation bandwidth more effectively.The present invention also can allow to dispose single transceiver, goes to handle grouped data, voice and fax/modem and communicates by letter, and can cancel the needs to special transceivers thus.Such result is that the present invention can effectively utilize the communication resource.
Principle of the present invention, preferred embodiment and operator scheme have more than been described.Yet the present invention should not be restricted to the specific embodiment of above-mentioned discussion.The above embodiments should be regarded explanation like this, rather than limit purposes of the present invention, and those skilled in the art is to be understood that, can do various variations to these embodiment, and not break away from the defined scope of the present invention of claim subsequently.

Claims (18)

1. method of utilizing communication protocol to transmit data and non-data message between base station and mobile services switching centre, this method comprises the steps:
These data of transmission and this non-data message in the single frame of in this communication protocol this.
2. the process of claim 1 wherein that this non-data message is a voice messaging.
3. the process of claim 1 wherein that this non-data message is a fax/modem information.
4. the process of claim 1 wherein that this communication protocol is the TTL agreement.
5. the method for claim 4 wherein comprises a plurality of individualities in this single frame, and should go to carry these data by at least one central individuality of individuality, and at least one individuality in this individuality removes this non-data message of carrying.
6. the method for claim 5 wherein comprises a plurality of subdomains in each individuality, and one of them subdomain be used to identify this individuality be the carrying data or the carrying non-data message.
7. system comprises:
Be used in the single frame of communication protocol, transmitting the device of data and non-data;
Be used to receive the device of this single frame, be used for these data are delivered to first destination address by route, and be used for this non-data message is delivered to second destination address by route.
8. the method for claim 7, this non-data message is a voice messaging.
9. the method for claim 7, this non-data message is a fax/modem information.
10. the system of claim 7, wherein this non-data message is voice and fax/modem information.
11. the system of claim 7, wherein this communication protocol is the TTL agreement.
12. the method for claim 11 wherein comprises a plurality of individualities in this single frame, at least one individuality in the middle of this individuality goes to carry these data, and at least one individuality in should individuality goes these non-data of carrying.
13. the method for claim 12 wherein comprises a plurality of subdomains in each individuality, and one of them subdomain be used to identify individuality be the carrying data or the carrying non-data message.
14. the system of claim 7, wherein this first destination address is a packet data network, and this second destination address is a telephone network.
15. a base station comprises:
At least one transceiver is used for deal with data and non-data message, and according to communication protocol these data and non-data message is transmitted by route,
Wherein data in the single frame in this communication protocol and non-data message all will be through the transmission of this at least one transceiver.
16. the base station of claim 15, wherein this communication protocol is the TTL agreement.
17. the base station of claim 16 wherein comprises a plurality of individualities in this single frame, at least one individuality in the middle of this individuality goes to carry these data, and at least one individuality in should individuality goes these non-data of carrying.
18. the system of claim 17 wherein comprises a plurality of subdomains in each individuality, and one of them subdomain be used to identify this individuality be the carrying data or the carrying non-data message.
CN99815359A 1998-12-31 1999-12-14 Data transmission method between base station and mobile switching center Pending CN1332941A (en)

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US09/224,802 1998-12-31

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