CN101360264B - Data transmission method and apparatus based on IP Abis interface - Google Patents
Data transmission method and apparatus based on IP Abis interface Download PDFInfo
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Abstract
The invention discloses a data transmission method based on an IP Abis interface and a device, and the method comprises: a data transmission sending terminal of the IP Abis interface utilizes business payload data and control parameters to set up a business frame; a field containing business description information is added in the business frame, and the business frame is encapsulated in a real-time transmission protocol frame; the real-time transmission protocol frame is encapsulated in a network protocol frame, and is transmitted through an IP network; and a data transmission receiving terminal of the IP Abis interface analyses the real-time transmission protocol frame from received network protocol frame, analyses the business frame from the real-time transmission protocol frame, and then obtains the business payload data and the control parameters according to the analysis to the business frame. Through the use of the data transmission method, the invention can simplify the structure of the business frame, ensure transmission reliability and save network bandwidth resources.
Description
Technical field
The present invention relates to the mobile data transmission technology, particularly relate to a kind of data transmission method and device based on the IP Abis interface.
Background technology
Global system for mobile communications (GSM, Global System for Mobile Communications) be most popular a kind of communication system in the mobile communication, its equipment for radio access network is commonly referred to base station sub-system (BSS, Base Station System).The effect that BSS plays in GSM is: on the one hand, BSS links to each other by the same portable terminal of wireless network (MS, Mobile Station), carries out transmission, reception and the RRM of wireless signal; On the other hand, BSS and the (MSC of mobile switching centre, Mobile SwitchingCenter) or Mobile Switching Center Server (MSC Server, Mobile Switching Center Server) links to each other, realize functions such as communicating to connect between the MS or between MS and the fixed network users, transfer system information and user profile.
As shown in Figure 1, typical B SS comprises two logical nodes: base station controller (BSC, Base StationController) 1 and base transceiver station (BTS, Base Transceiver Station) 2.BSC1 connects MSC3 by the A interface, and BTS2 connects MS4 by Um Interface.Communication interface between BSC1 and the BTS2 is called Abis interface, is used to realize that the far-end between BSC1 and the BTS2 interconnects.Generally, Abis interface adopts the 2.048Mbps of standard or pulse code modulation (PCM, the Pulse CodeModulation) digital transmission link of 64Kbps to realize transfer of data, carry voice traffic channel on the PCM digital transmission link.The frame structure that transmits in the Abis interface meets the structure of code conversion and Rate Adapter Unit (TRAU, Transcoding and Rate Adaptation Unit) frame.
Every trau frame of 20ms transmission, this trau frame comprises 320bit or 160bit data, corresponds respectively to the full speed channel of 16Kbps and the half-rate channel of 8Kbps between BSC1 and the BTS2.The TRAU frame can be divided into speech business frame, Operation and Maintenance frame, Frame and empty frame again by business or function, wherein the speech business frame comprises full rate (FR, Full Rate) speech business frame, enhanced full rate (EFR, EnhancedFull Rate) speech business frame, half rate (HR, Half Rate) speech business frame, adaptive multi-rate coding (AMR, Adaptive Multi-rate) speech business frame.In the trau frame, generally comprise synchronous head, data bit and Control Parameter and compare top grade.
Traditional Abis interface is based on Circuit-switched, so the trau frame that transmits in the Abis interface be in order to satisfy Circuit-switched requirement, has defined a large amount of and the closely-related Control Parameter bit of circuit-switched transfer, as synchronous bit etc.; And defined some and the multiplexing closely-related Control Parameter bit of pcm stream, adjust parameter TA than top grade as Timing Advance, and some useless packing ratio top grades; Also comprise the D bit that carries professional payload data in the trau frame and carry the C bit of Control Parameter.In addition, the trau frame that transmits in the Abis interface, corresponding different business has different structure and parameter definition modes, causes the frame structure complexity, and causes the rate adapted operation at Abis interface two ends also too complicated thereupon.
As shown in Figure 2, comprise the sign indicating number type converting unit 101 and the Rate Adapter Unit 102 of BSC side in the prior art based on the data transmission device of Abis interface, and the Rate Adapter Unit 201 of BTS side.Wherein, sign indicating number type converting unit 101 is used for professional payload data and Control Parameter are carried out code conversion in the transmitting uplink data process, and the data after the code conversion are sent to the A interface; In the downlink data transmission process, be used for the data that transmission comes to the A interface and carry out code conversion, produce digital coding and Control Parameter.
The Rate Adapter Unit 202 of BTS side, in the transmitting uplink data process, be used for the professional payload data of extracting data that sends from its follow-up processing unit, and determine Control Parameter according to type of service, set up traffic frame, again traffic frame is sent to the Rate Adapter Unit 102 of BSC side; In the downlink data transmission process, the Rate Adapter Unit 202 of BTS side is used for parsing professional payload data and Control Parameter from the traffic frame that the BSC side is sent, and should the business payload data and Control Parameter pass to its follow-up processing unit.Here, the subsequent treatment unit comprises unit such as coded modulation, transmission control, and its function and structure and content of the present invention are irrelevant, no longer give unnecessary details at this.
Recently, along with Softswitch technology is introduced core net, IP-based switching network framework forms gradually.Wherein,, be called for short the IP Abis interface, have higher efficiency of transmission and flexibility, will be based on the important component part in the switching network framework of IP transmission with respect to traditional Abis interface based on PCM transmission link based on the Abis interface of IP transmission means.The IP Abis interface no longer is confined to Circuit-switched mode, if continue to keep the various Control Parameter bits of setting for circuit-switched adapted requires, and maintenance and the similar transmission means of primary circuit exchange, will cause waste of network resources.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of data transmission method and device based on the IPAbis interface, can solve the trau frame complex structure of Abis interface transmission in the prior art, the problem of bandwidth resources waste, satisfying under the prerequisite that reduces bandwidth resources, realize reliable transmission.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of data transmission method based on the IP Abis interface, this method comprises: the transfer of data transmitting terminal of IP Abis interface utilizes professional payload data and Control Parameter to set up traffic frame; In described traffic frame, add the field that comprises service description information, and described traffic frame is encapsulated in the RTP frame; Described RTP frame is encapsulated in the procotol frame, transmits by IP network; The transfer of data receiving terminal of IP Abis interface parses the RTP frame from the procotol frame of receiving, and parses traffic frame from the RTP frame, again according to professional payload data and Control Parameter are obtained in the parsing of traffic frame.
Wherein, be the procotol frame with described RTP frame by the UDP/IP protocol encapsulation.
Wherein, when described transfer of data receiving terminal is base station controller, obtains professional payload data and Control Parameter and also further comprise step afterwards: base station controller carries out the code conversion operation to professional payload data and Control Parameter, and is sent to the A interface; Perhaps, when described transfer of data receiving terminal is base transceiver station, obtains professional payload data and Control Parameter and also further comprise step afterwards: base transceiver station carries out the coded modulation operation to professional payload data.
Wherein, described traffic frame comprises frame header and payload section part, and frame header comprises frame type indication and length field field, and payload section partly comprises professional payload data and Control Parameter.And described service description information comprises sub-district, place, carrier frequency, channel and traffic type information.
Wherein, in the described RTP frame, be packaged with the traffic frame that comprises the service description information field more than simultaneously.
Wherein, the described traffic frame that comprises the service description information field more than comes from the business of same sub-district same carrier.
A kind of data transmission device based on the IP Abis interface, described device comprises the Rate Adapter Unit of base transceiver station side, Rate Adapter Unit, RTP realization unit and the network-driven unit that RTP is realized unit and network-driven unit and side of base station controller, wherein
The Rate Adapter Unit of base transceiver station side, in the transmitting uplink data process, be used for from the professional payload data of the extracting data that receives, and determine Control Parameter according to type of service, set up traffic frame, in the downlink data transmission process, be used for parsing professional payload data and Control Parameter from traffic frame;
The RTP of base transceiver station side is realized the unit, the traffic frame that is used for the Rate Adapter Unit of this side is set up in the transmitting uplink data process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame, in the downlink data transmission process, be used to resolve the RTP frame, extract the Rate Adapter Unit that traffic frame is given this side;
The network-driven unit of base transceiver station side and side of base station controller during as transmitting terminal, is used for utilizing the network transmission protocol that the RTP frame is encapsulated in the procotol frame, and sends this procotol frame by IP network; During as receiving terminal, be used for the receiving network protocol frame, therefrom parse the RTP frame then, give the RTP realization unit of side separately respectively;
The RTP of side of base station controller is realized the unit, in the transmitting uplink data process, be used to resolve the RTP frame, extract traffic frame and give the Rate Adapter Unit of this side, the traffic frame that is used for the Rate Adapter Unit of this side is set up in the downlink data transmission process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame;
The Rate Adapter Unit of side of base station controller is used for parsing professional payload data and Control Parameter from traffic frame in the transmitting uplink data process, is used for setting up traffic frame according to digital coding and Control Parameter in the downlink data transmission process.
In addition, this device also comprises the sign indicating number type converting unit of side of base station controller, and described sign indicating number type converting unit is used for professional payload data and Control Parameter are carried out code conversion in the transmitting uplink data process, and the data after the code conversion are sent to the A interface; In the downlink data transmission process, be used for the data that transmission comes to the A interface and carry out code conversion, produce digital coding and Control Parameter.
A kind of base station controller based on the IP Abis interface, described base station controller comprise Rate Adapter Unit, RTP realization unit and network-driven unit, wherein,
The network-driven unit during as transmitting terminal, is used for utilizing the network transmission protocol that the RTP frame is encapsulated in the procotol frame, and sends the procotol frame of encapsulation by IP network; During as receiving terminal, be used for the receiving network protocol frame, therefrom parse the RTP frame then, give RTP and realize the unit;
RTP is realized the unit, in the transmitting uplink data process, be used to resolve the RTP frame, extract traffic frame and give Rate Adapter Unit, the traffic frame that is used for Rate Adapter Unit is set up in the downlink data transmission process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame;
Rate Adapter Unit is used for parsing professional payload data and Control Parameter from traffic frame in the transmitting uplink data process, is used for setting up traffic frame according to digital coding and Control Parameter in the downlink data transmission process.
In addition, described base station controller also comprises a yard type converting unit, and described sign indicating number type converting unit is used for professional payload data and Control Parameter are carried out code conversion in the transmitting uplink data process, and the data after the code conversion are sent to the A interface; In the downlink data transmission process, be used for the data that transmission comes to the A interface and carry out code conversion, produce digital coding and Control Parameter.
A kind of base transceiver station based on the IP Abis interface, described base transceiver station comprise Rate Adapter Unit, RTP realization unit and network-driven unit, wherein,
Rate Adapter Unit, in the transmitting uplink data process, be used for from the professional payload data of the extracting data that receives, and determine Control Parameter according to type of service, and set up traffic frame, in the downlink data transmission process, be used for parsing professional payload data and Control Parameter from traffic frame;
RTP is realized the unit, the traffic frame that is used for Rate Adapter Unit is set up in the transmitting uplink data process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame, in the downlink data transmission process, be used to resolve the RTP frame, extract traffic frame and give Rate Adapter Unit;
The network-driven unit during as transmitting terminal, is used for utilizing the network transmission protocol that the RTP frame is encapsulated in the procotol frame, and sends this procotol frame by IP network; During as receiving terminal, be used for the receiving network protocol frame, therefrom parse the RTP frame then, give RTP and realize the unit.
Data transmission method provided by the present invention and device, traffic frame is encapsulated in RTP (RTP, Real Time Transport Protocol) in the frame, processing by the Real-time Transport Protocol mode, multiple services such as sequential reorganization, LOF detection can be provided, therefore can guarantee the transmission reliability of IP Abis interface.Because the present invention simplified the trau frame structure, removed that some IP transmit unwanted Control Parameter bit or filling bit in the trau frame, therefore can the conserve network bandwidth resource.In addition, the present invention is encapsulated in a plurality of traffic frames in the RTP frame, realizes the multiplexing of RTP frame, therefore further conserve network bandwidth resource.
Description of drawings
Fig. 1 is BSS structure and an interface schematic diagram in the prior art;
Fig. 2 is the data transmission device high-level schematic functional block diagram of Abis interface in the prior art;
Fig. 3 among the present invention based on the data transmission device high-level schematic functional block diagram of IP Abis interface;
Fig. 4 among the present invention based on the data transmission method flow chart of IP Abis interface;
Fig. 5 among the present invention based on the trau frame structural representation of the simplification that data transmission method sends of IP Abis interface;
Send the structural representation of procotol frame among Fig. 6 the present invention based on the data transmission method of IP Abis interface.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Core concept of the present invention is: the structure of simplifying trau frame, remove and the irrelevant Control Parameter of IP transmission, a kind of traffic frame of simplifying the trau frame structure is proposed thus, utilize the traffic frame after the Real-time Transport Protocol transmission is simplified, and a plurality of traffic frames are encapsulated in the Real-time Transport Protocol frame, realize the multiplexing of Real-time Transport Protocol frame.
In order to realize the present invention is based on the data transmission method of IP Abis interface, the present invention has adopted the data transmission device based on the IP Abis interface as shown in Figure 3, this device realizes that with respect to the RTP that prior art has increased the BTS side RTP of unit 203 and network-driven (NetDr, Net Driver) unit 204 and BSC side realizes unit 103 and NetDr unit 104.Wherein,
The Rate Adapter Unit 202 of BTS side in the transmitting uplink data process, is used for the professional payload data of extracting data that sends from its follow-up processing unit, and determines Control Parameter according to type of service, sets up traffic frame; In the downlink data transmission process, be used for parsing professional payload data and Control Parameter from traffic frame, offer its follow-up processing unit and finish the coded modulation operation.
The RTP of BTS side realizes unit 203, and in the transmitting uplink data process, the traffic frame that is used for the Rate Adapter Unit 202 of this side is set up adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame; In the downlink data transmission process, be used to resolve the RTP frame, extract traffic frame and give the Rate Adapter Unit 202 of this side.
The NetDr unit 204 of BTS side and the NetDr unit 104 of BSC side are used to utilize the network transmission protocol during as transmitting terminal, the RTP frame is encapsulated in the procotol frame, and sends the procotol frame by IP network; NetDr unit 204,104 is during as receiving terminal, and the receiving network protocol frame parses the RTP frame then, and the RTP that gives BTS side and BSC side respectively realizes unit 203,103.
The RTP of BSC side realizes unit 103, in the transmitting uplink data process, is used to resolve the RTP frame, extracts traffic frame and gives the Rate Adapter Unit 102 of this side; In the downlink data transmission process, the traffic frame that is used for the Rate Adapter Unit 102 of this side is set up adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame, sends to NetDr unit 104.
The Rate Adapter Unit 102 of BSC side in the transmitting uplink data process, is used for parsing professional payload data and Control Parameter from traffic frame; In the downlink data transmission process, be used for utilizing yard digital coding that type converting unit 101 is sent and Control Parameter to set up traffic frame.
Sign indicating number type converting unit 101 in the transmitting uplink data process, is used for professional payload data and Control Parameter that the Rate Adapter Unit 102 to this side sends and carries out code conversion, and the data after the code conversion are sent to the A interface; In the downlink data transmission process, be used for the data that transmission comes to the A interface and carry out code conversion, produce the Rate Adapter Unit 102 that digital coding and Control Parameter send to the BSC side.In actual applications, if adopt identical coded system in the IP Abis interface with in the A interface, sign indicating number type converting unit 101 also can be omitted.
Based on structure shown in Figure 3, the data transmission method that the present invention is based on the IP Abis interface comprises transmitting uplink data process and downlink data transmission process.In the transmitting uplink data process, BTS is a transmitting terminal, and BSC is a receiving terminal; In the downlink data transmission process, BSC is a transmitting terminal, and BTS is a receiving terminal.With the upstream data transmission course is example, and the transmitting uplink data process of data transmission method of the present invention comprises following steps as shown in Figure 4:
Step 301:BTS is from the professional payload data of the extracting data that self receives, and determines Control Parameter according to type of service, utilizes the professional payload data that extracts and the Control Parameter of determining to set up traffic frame.
For can conserve network resources, to save with IP and transmit incoherent Control Parameter, the structure of traffic frame described here can be different with the structure of traditional trau frame, are defined as general TRAU (G-TRAU, General TRAU) frame.As shown in Figure 5, this frame comprises two parts: frame header 401 and payload section part 402, frame header 401 comprises frame type indication 403 and length field field again, frame type indication 403 these traffic frames of sign belong to speech business frame, Operation and Maintenance frame, Frame or empty frame, the length field field comprises two fields: be respectively the field parameter length 404 of the length of sign Control Parameter part, and the field data length 405 of the length of identification service payload part.
Payload section partly comprises professional payload data 407 and Control Parameter 406, and professional payload data 407 has carried the D bit in the former trau frame, carrying be the net load data of miscellaneous service, for example voice signal or data service signal etc.And Control Parameter 406 mainly is the C bit that carries in the former trau frame, its content is closely related with frame type, for example: for the traffic frame of uplink uncontinuous speec transmission, Control Parameter 406 has just comprised bad frame indication (BFI, Bad Frame Indication), quiet indication (SID, SilenceDescriptor), time unifying sign parameters such as (TAF, Time Alignment Flag); Transmit for down discontinuousness voice, Control Parameter 406 has just comprised SP than top grade parameter, for the conserve network resources bandwidth, saved the Control Parameter bit relevant in the G-TRAU frame with circuit-switched transfer, as synchronous bit etc., the perhaps multiplexing closely-related Control Parameter bit of pcm stream is adjusted parameter TA than top grade as Timing Advance, and useless filling bit, tail compare top grade.
Certainly, for compatible with Abis interface data transmission method of the prior art and device, traffic frame herein also can directly adopt the structure of traditional trau frame, can not produce other influences to enforcement of the present invention.
Step 302: traffic frame is added the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame.
In order to guarantee the transmission reliability of IP Abis interface, the data transmission method that the present invention is based on the IP Abis interface has selected to utilize the mode of Real-time Transport Protocol bearer service frame, Real-time Transport Protocol can provide the Real-time Data Transfer Method based on clean culture or multicast network, and multiple services such as sequential reorganization, LOF detection are provided.It relies on RTCP Real-time Transport Control Protocol (RTCP, Real Time Transport Control Protocol) to come the monitor data transmission quality, can effectively guarantee transmission reliability.
If each traffic frame is put into a RTP frame separately to be transmitted, because the UDP of RTP frame and carrying Real-time Transport Protocol, the expense of the packet header of IP protocol frame is all fixed, if the packet payload is smaller in the frame, for example the length of traffic frame is not more than 20 bytes during half rate traffic, less than RTP/UDP/IP packet header length, redundancy overhead based on the transfer of data of IP Abis interface will be bigger so, thereby reduced efficiency of transmission, so, angle from the conserve network bandwidth resource, a plurality of traffic frames can be encapsulated in the RTP frame and transmit, carry out the multiplexing of RTP frame.
Consider the problem of time delay, and be not suitable for a plurality of traffic frames in the front and back of a MS are encapsulated in the same RTP frame, be encapsulated in mode in the same RTP frame so select to come from the traffic frame that a plurality of MS produced of same sub-district in the embodiment of the invention.As a preferred embodiment, select a plurality of traffic frames that belong to same carrier of same sub-district are encapsulated in the same RTP frame.
For a plurality of traffic frames being encapsulated in the same RTP frame, should add the field that comprises service description information to traffic frame, described service description information comprises sub-district, place, carrier frequency, channel and traffic type information.Claim that this service description information field is the TrafficIE field.Therefore, concrete packaged type is in the present embodiment: in the payload section behind Real-time Transport Protocol packet header, fill in the TrafficIE field of each traffic frame and the payload of being made up of traffic frame successively.
Because the RTP frame after the encapsulation is the payload of the network transmission protocol such as UDP/IP, whether can exceed the restriction of procotol frame transmission length so should consider the RTP frame.Under the situation of RTP frame length minimum, if in the RTP frame in the packaged sub-district single carrier frequency only carry a half-rate speech business, then the traffic frame of G-TRAU frame structure is not more than 20 bytes, and the expense of TrafficIE field is 2～4 bytes, so the payload of RTP frame is less than 24 bytes.The situation of RTP frame length maximum is single carrier frequency carrying grouping busihess data, and 8 channels of single carrier frequency all adopt the most complicated Modulation and Coding Scheme 9 (MCS9, Modulation andCoding Schemes9) encodes, in this case, the total payload of RTP frame is in 1400 bytes, transmit the restriction of 1500 bytes less than ethernet ip, can not cause losing of data.
Certainly, also can not adopt in this step and the RTP frame be carried out multiplexing, only single traffic frame and TrafficIE field thereof are encapsulated in the RTP frame, and can the realization of the data transmission method based on the IP Abis interface of the present invention not impacted.
Step 303: utilize UDP/IP agreement framing.
For by IP network transmission RTP frame, utilize UDP/IP protocol transmission RTP frame usually.A structure of utilizing the procotol frame that the UCP/IP agreement sets up as shown in Figure 6.This procotol frame comprises IP packet header 501, UDP packet header 502, RTP packet header 503 and RTP payload 504, wherein, encapsulated the one group of above payload 506 be made up of traffic frame and the TrafficIE field 505 corresponding with it in the RTP payload, the mode of framing is consistent with the method for Network Transmission framing in the prior art.
Certainly, the transmission of RTP frame not merely is restricted to utilizes udp protocol, also can use Transmission Control Protocol or other procotols carrying RTP frame, can not cause other influences for realization of the present invention.
Step 304: the procotol frame of being organized by IP network transmitting step 303.
Step 305:BSC receiving network protocol frame utilizes the UDP/IP agreement to carry out frame and resolves, and parses the RTP frame from the procotol frame.
Parsing in this step, corresponding with the framing in the step 303, from the procotol frame, parse the RTP frame, to separate package operation consistent for the UDP/IP agreement in analytic method and the prior art.If what utilize in the step 303 is other agreement carryings RTP frame, then in this step, adopt other agreements from the procotol frame that utilizes other agreements establishments, to parse the RTP frame.
Step 306: the RTP frame is resolved, obtain traffic frame and corresponding TrafficIE field thereof.
Parsing in this step, corresponding with the frame encapsulation in the step 302, at first the RTP frame is carried out the relevant treatment of Real-time Transport Protocol,, from the RTP frame, parse traffic frame and its corresponding TrafficIE field more than one group then as sequential control, anti-shake operation etc.
Step 307: the traffic frame that parses is carried out rate adapted, from traffic frame, take out Control Parameter and professional payload data.
Step 308: Control Parameter and the professional payload data that obtains carried out code conversion.
Professional payload data lotus and Control Parameter are carried out the code conversion operation, send to the A interface.
Downlink voice transmission course based on the IP Abis interface is similar with the ascending voice transmission course, does not repeat them here.
The above is preferred embodiment of the present invention only, is not to be used for limiting protection scope of the present invention.Those skilled in that art should be able to associate; traffic frame adopts different frame structures; the different Control Parameter of definition in the traffic frame; adopt other network transmission protocol carryings RTP frame; the RTP frame is adopted the multiplex mode of other types; service description information to traffic frame adds other guide all should belong to protection scope of the present invention.
Claims (12)
1. the data transmission method based on the IP Abis interface is characterized in that, this method comprises:
The transfer of data transmitting terminal of A, IP Abis interface utilizes professional payload data and Control Parameter to set up traffic frame;
B, in described traffic frame, add the field comprise service description information, and described traffic frame is encapsulated in the RTP frame;
C, described RTP frame is encapsulated in the procotol frame, transmits by IP network;
The transfer of data receiving terminal of D, IP Abis interface parses the RTP frame from the procotol frame of receiving, and parses traffic frame from the RTP frame, again according to professional payload data and Control Parameter are obtained in the parsing of traffic frame.
2. the data transmission method based on the IP Abis interface according to claim 1 is characterized in that, is the procotol frame with described RTP frame by the UDP/IP protocol encapsulation among the step C.
3. the data transmission method based on the IP Abis interface according to claim 1 is characterized in that,
Described transfer of data receiving terminal is a base station controller, also further comprises step after the step D: base station controller carries out the code conversion operation to professional payload data and Control Parameter, and is sent to the A interface;
Perhaps,
Described transfer of data receiving terminal is a base transceiver station, also further comprises step after the step D: base transceiver station carries out the coded modulation operation to professional payload data.
4. the data transmission method based on the IP Abis interface according to claim 1, it is characterized in that, traffic frame described in the steps A comprises frame header and payload section part, and frame header comprises frame type indication and length field field, and payload section partly comprises professional payload data and Control Parameter.
5. the data transmission method based on the IP Abis interface according to claim 1 is characterized in that, the information of service description described in the step B comprises sub-district, place, carrier frequency, channel and traffic type information.
6. the data transmission method based on the IP Abis interface according to claim 1 is characterized in that, among the step B, in the described RTP frame, is packaged with the traffic frame that comprises the service description information field more than simultaneously.
7. the data transmission method based on the IPAbis interface according to claim 6 is characterized in that the described traffic frame that comprises the service description information field more than comes from the business of same sub-district same carrier.
8. data transmission device based on the IP Abis interface, it is characterized in that, described device comprises the Rate Adapter Unit of base transceiver station side, Rate Adapter Unit, RTP realization unit and the network-driven unit that RTP is realized unit and network-driven unit and side of base station controller, wherein
The Rate Adapter Unit of base transceiver station side, in the transmitting uplink data process, be used for from the professional payload data of the extracting data that receives, and determine Control Parameter according to type of service, set up traffic frame, in the downlink data transmission process, be used for parsing professional payload data and Control Parameter from traffic frame;
The RTP of base transceiver station side is realized the unit, the traffic frame that is used for the Rate Adapter Unit of this side is set up in the transmitting uplink data process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame, in the downlink data transmission process, be used to resolve the RTP frame, extract the Rate Adapter Unit that traffic frame is given this side;
The network-driven unit of base transceiver station side and side of base station controller during as transmitting terminal, is used for utilizing the network transmission protocol that the RTP frame is encapsulated in the procotol frame, and sends this procotol frame by IP network; During as receiving terminal, be used for the receiving network protocol frame, therefrom parse the RTP frame then, give the RTP realization unit of side separately respectively;
The RTP of side of base station controller is realized the unit, in the transmitting uplink data process, be used to resolve the RTP frame, extract traffic frame and give the Rate Adapter Unit of this side, the traffic frame that is used for the Rate Adapter Unit of this side is set up in the downlink data transmission process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame;
The Rate Adapter Unit of side of base station controller is used for parsing professional payload data and Control Parameter from traffic frame in the transmitting uplink data process, is used for setting up traffic frame according to digital coding and Control Parameter in the downlink data transmission process.
9. the data transmission device based on the IP Abis interface according to claim 8, it is characterized in that, this device also comprises the sign indicating number type converting unit of side of base station controller, described sign indicating number type converting unit is used for professional payload data and Control Parameter are carried out code conversion in the transmitting uplink data process, and the data after the code conversion are sent to the A interface; In the downlink data transmission process, be used for the data that transmission comes to the A interface and carry out code conversion, produce digital coding and Control Parameter.
10. the base station controller based on the IP Abis interface is characterized in that, described base station controller comprises Rate Adapter Unit, RTP realization unit and network-driven unit, wherein,
The network-driven unit during as transmitting terminal, is used for utilizing the network transmission protocol that the RTP frame is encapsulated in the procotol frame, and sends the procotol frame of encapsulation by IP network; During as receiving terminal, be used for the receiving network protocol frame, therefrom parse the RTP frame then, give RTP and realize the unit;
RTP is realized the unit, in the transmitting uplink data process, be used to resolve the RTP frame, extract traffic frame and give Rate Adapter Unit, the traffic frame that is used for Rate Adapter Unit is set up in the downlink data transmission process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame;
Rate Adapter Unit is used for parsing professional payload data and Control Parameter from traffic frame in the transmitting uplink data process, is used for setting up traffic frame according to digital coding and Control Parameter in the downlink data transmission process.
11. the base station controller based on the IP Abis interface according to claim 10, it is characterized in that, described base station controller also comprises a yard type converting unit, described sign indicating number type converting unit is used for professional payload data and Control Parameter are carried out code conversion in the transmitting uplink data process, and the data after the code conversion are sent to the A interface; In the downlink data transmission process, be used for the data that transmission comes to the A interface and carry out code conversion, produce digital coding and Control Parameter.
12. the base transceiver station based on the IPAbis interface is characterized in that, described base transceiver station comprises Rate Adapter Unit, RTP realization unit and network-driven unit, wherein,
Rate Adapter Unit, in the transmitting uplink data process, be used for from the professional payload data of the extracting data that receives, and determine Control Parameter according to type of service, and set up traffic frame, in the downlink data transmission process, be used for parsing professional payload data and Control Parameter from traffic frame;
RTP is realized the unit, the traffic frame that is used for Rate Adapter Unit is set up in the transmitting uplink data process adds the field that comprises service description information, and this traffic frame is encapsulated in the RTP frame, in the downlink data transmission process, be used to resolve the RTP frame, extract traffic frame and give Rate Adapter Unit;
The network-driven unit during as transmitting terminal, is used for utilizing the network transmission protocol that the RTP frame is encapsulated in the procotol frame, and sends this procotol frame by IP network; During as receiving terminal, be used for the receiving network protocol frame, therefrom parse the RTP frame then, give RTP and realize the unit.
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| CN101990241B (en) * | 2009-08-06 | 2013-08-07 | 中兴通讯股份有限公司 | Packet data transmission system and method |
| CN101742569B (en) * | 2009-11-13 | 2013-01-16 | 中兴通讯股份有限公司 | Base station and data transmission switching method thereof |
| CN104796225B (en) * | 2015-03-23 | 2018-12-11 | 中国铁路总公司 | 4.8kb/s data business transmission method based on IPization GSM-R network |
| CN112888049B (en) * | 2021-01-26 | 2022-08-26 | 展讯半导体(成都)有限公司 | Data transmission control method, function machine and related product |
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