CN1929634A - Method and system for sectionalized wireless data-transmission between base station and base station controllers - Google Patents
Method and system for sectionalized wireless data-transmission between base station and base station controllers Download PDFInfo
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Abstract
This invention relates to mobile communication area and discloses one wireless data transmission method and system of station to station, which can make use of small Abis linkage materials to realize EGPRS business group transmission. This invention determines minimum linkage number n according to group wireless data and its information length and sends wireless data and its information to receive end through n Abis interface linkage ETRAU frame composed of one set of information.
Description
Technical field
The present invention relates to moving communicating field, particularly the data transmission technology between base station and the base station controller.
Background technology
Global system for mobile communications (Global System of Mobile communication is called for short " GSM ") is maximum at present digital cellular communication system, belongs to second generation mobile communication system.
GPRS (General Packet Radio Service is called for short " GPRS ") network is a kind of cellular mobile communication networks of new generation based on the GSM network.In order to support the GPRS function, in existing GSM network, need to increase some nodes, as Gateway GPRS Support Node (GatewayGPRS Support Node, abbreviation " GGSN "), Serving GPRS Support Node (Serving GPRSSupport Node, be called for short " SGSN "), they all belong to GPRS Support Node (GPRS SupportNode is called for short " GSN ").In addition, at 3G (Third Generation) Moblie (The Third Generation, be called for short " 3G ") universal mobile telecommunications system (Universal Mobile Telecommunications System, abbreviation " UMTS ") in the core net, also support the GPRS function, GSN nodes such as GGSN and SGSN are arranged equally.
The GSM evolution scheme (Enhanced Data Rates for GSMEvolution is called for short " EDGE ") that strengthens data rate is the expansion scheme of GSM network, can make full use of existing resources, does little change slightly, and finally seamlessly transits to third generation system.Existing gsm system, the general circuit type data service that 9.6kbit/s only can be provided, low like this data communication rates obviously can't satisfy the demand of mobile multimedia data communication, therefore, producers one after another exploitation new, speed mobile data communication technology faster, wherein most typical is exactly GPRS and two-forty circuit switched data (High-rate Circuit Switching Data is called for short " HCSD ").GPRS has introduced the mode that classification exchanges first at core network, becomes GSM the only way which must be passed to the evolution of third generation network, and can provide flank speed to the user is the link of 171kbit/s, and general is 108kbit/s only.GSM and gprs system can adopt a kind of EDGE of new high level modulation mode to improve the validity of modulation, and it can make that user data rate reaches 384kbit/s.This wireless access technology EDGE based on the second generation is for GSM development third generation business on existing frequency range provides possibility.In existing GSM network, introduce the EDGE technology and will inevitably bring influence existing network infrastructure and mobile communication equipment, mainly that influence is accessing wirelessly part base station system (Base Station System, abbreviation " BSS ") base transceiver station (Base Transceiver Station, be called for short " BTS ") and base station controller (Base StationControl, be called for short " BSC "), for not influence of network interface.
EDGE comprises a packet-switched transmission pattern Enhanced GPRS (EnhancedGPRS, be called for short " EGPRS ") and circuit-switched transfer pattern enhanced circuit switched data (Enhanced Circuit Switching Data is called for short " ECSD ").Wherein, EGPRS has defined 9 kinds of Modulation and Coding Scheme: MCS-1, MCS-2, MCS-3, MCS-4, MCS-5, MCS-6, MCS-7, MCS-8, MCS-9, the business of corresponding different rates.
EGPRS mainly is Abis interface to the influence of gsm system architecture.Abis interface is the interface between base station and the base station controller, and in gsm system, the physical layer of the Abis interface between BSC and the BTS is E1, and protocol layer is code check adaptation unit (Transfer Rate Adapter Unit is called for short " TRAU ") frame structure.In general the speed of trau frame is 16K, and also promptly interior each link of frame timing cycle 20ms can be received and dispatched the 320bits data.The trau frame structure of forming at this 320bits generally comprises synchronous head, control bit, data bit.The structure of trau frame also can define voluntarily according to the standard of agreement.Abis interface extends to packet control unit (PacketControl Unit in the GPRS/GSM system, be called for short " PCU "), chnnel coding unit (Channel Coding Unit, be called for short " CCU ") send the trau frame data to BSC, BSC gives PCU with the trau frame data penetration transmission again, so Abis interface also is the interface between PCU and the BTS, basic structure also is the trau frame of 16k.Fig. 1 shows Abis interface present position in gprs system.
In gprs system, the Abis interface bandwidth of each BTS is limited.Usually, each BTS can be assigned to some E1 transmission bandwidths, and the transmission rate of every E1 is 2M, can be divided into the time slot of 32 64K, and each time slot can be divided into 2 32K sub-slots again, or 4 16K sub-slots, or 8 8K sub-slots.
In order to realize the transfer of data of Abis interface in GPRS and the EGPRS business, in the prior art, Um mouth wireless channel for each carrying EGPRS business distributes the Abis link of a 64K bandwidth, and this link can be received and dispatched the 1280bit data in each frame timing cycle (20ms).Transmitting terminal will need Radio Link control (the Radio Link Controller of the various speed transmitted, be called for short " RLC ")/media interviews control (Medium Access Control, be called for short " MAC ") layer data block, add a last frame synchronization head, some in-band information bits and some rate adapted bits, form a Frame, the Abis link transmission of this Frame being passed through the 64K bandwidth is to the opposite end.
Yet, because existing gprs service has 4 kinds of coded modulation speed, the EGPRS business has 9 kinds of coded modulation speed, need the data quantity transmitted difference under the different coding modulation system, specifically as shown in table 1, be under the situation of MCS-1 to MCS-5 in coded system, need the data of transmission that 209bits to 487bits is only arranged, use the Abis interface link of 64K this moment, wasted the Abis interface bandwidth resources to a great extent.
| Modulation coding mode | Downlink data block (bits) | Uplink data block (bits) | Frame number |
| MCS-1 | 209 | 209 | 1 |
| Mcs-2 | 257 | 257 | 1 |
| Mcs-3 | 329 | 329 | 2 |
| Mcs-4 | 385 | 385 | 2 |
| Mcs-5 | 478 | 487 | 2 |
| Mcs-6 | 622 | 631 | 2 |
| Mcs-7 | 940 | 946 | 3 |
| Mcs-8 | 1132 | 1138 | 4 |
| Mcs-9 | 1228 | 1234 | 4 |
Table 1
For fear of the waste of Abis interface bandwidth resources, the Abis interface traffic channel resource can be managed by 16K link circuit resource pond, that is to say each link transmit-receive 320bit data in every 20ms.But in 9 kinds of code modulation modes of EGPRS business, adopt under the situation of code modulation mode MCS-6 to MCS-9, need the more data of transmission, the link of a 16K can't in time be finished.Such as shown in table 1, under the MCS-6 coded system, the up data that need to transmit in the back of encoding are 631bits, and the descending data that need to transmit are 622bits, and the Abis link of a 16K once can only transmit 320bits.
At this point, prior art is divided into some with the EGPRS RLC/MAC data block of different rates, adds frame synchronization head and certain in-band information bit and filling bit on each data block, constitutes some Frames that are less than or equal to 320 bits.
Afterwards, on pre-assigned some 16KAbis interface links, will cut apart the disposable receiving terminal that is transferred to of each Frame of formation.Wherein, the Abis interface link number of pre-assigned 16K is to determine according to the highest service rate that current Um mouth wireless channel carries.
Receiving terminal receives each Frame respectively from the Abis interface link of each bar 16K, after removing the first-class information of frame synchronization, the data bit that is wherein belonged to same RLC/MAC data block is reformulated complete RLC/MAC data block according to the in-band information bit with it afterwards.
In actual applications, have following problem: still there is the wasting phenomenon of Abis interface bandwidth resources in the Abis interface link transmission data piece of employing 16K.
Cause the main cause of this situation to be, since in the prior art when the bigger RLC/MAC data block of transmission, it need be divided into a few height pieces, and for each is cut apart the data sub-block that obtains is added the frame synchronization head and the in-band information bit is formed Frame, too much frame synchronization head and in-band information bit make originally can be by the data block of 4 Abis interface link transmission, must could transmit by 5 Abis interface links, as under the MCS-9 code modulation mode, the size of a data block is 1228bits, do not having under the situation of out of Memory, can be divided to the Abis interface link transmission of 4 16K, yet, make this data block can only pass through 5 Abis interface link transmission owing to must carry a large amount of headers and in-band information bit on each data block.And under code modulation modes such as MSC-6 to MCS-8, also there is same problem, the table of comparisons 1, data block in the practical application under the MCS-8 coded system must be divided into 5, divide and in 5 16K Abis links, transmit, data block under the MCS-7 coded system must be divided in 4 16K Abis links and transmitted, and the data block under the MCS-6 coded system must be divided in 3 Abis links and transmitted or the like, has still wasted the bandwidth resources of some Abis interface.
Summary of the invention
In view of this, main purpose of the present invention is to provide packet radio data transmission method and system thereof between a kind of base station and the base station controller, makes it possible to realize with less Abis link circuit resource the transmission of EGPRS business grouping data.
For achieving the above object, the invention provides packet radio data transmission method between a kind of base station and the base station controller, comprise following steps:
Bandwidth according to Abis interface link between the total length of packet radio data and in-band information bit thereof and base station and the base station controller is determined minimal chain way n;
Transmitting terminal is transferred to receiving terminal with described packet radio data and in-band information bit thereof by n frame on the n bar Abis interface link;
Described receiving terminal receives a described n frame by described n bar Abis interface link, therefrom obtains described packet radio data and in-band information bit thereof.
Wherein, the length V of described frame is the bandwidth of Abis interface link and the product of frame timing cycle;
Described minimal chain way n is rounded up divided by the merchant of V gained by the total length of described packet radio data and in-band information thereof and obtains.
In this external described method, also comprise following steps:
If in described frame, except that described packet radio data and in-band information thereof, also have remaining bits, then in these remaining bits, frame sync identifications is set, if after frame sync identifications is set, also have remaining bits, then in these remaining bits, filling bit is set;
Described receiving terminal receives this frame synchronously according to described frame sync identifications.
In this external described method, when not comprising described frame sync identifications in the described frame, described receiving terminal receives this frame synchronously according to frame sync identifications and the frame timing cycle in the frame that receives before in the same Abis interface link.
In this external described method, every described Abis link transmits a frame that comprises described frame sync identifications at least in scheduled duration.
In this external described method, described packet radio data are radio link control layer/MAC layer grouped datas of non-modulated coding in Enhanced GPRS or the GPRS.
The present invention also provides packet radio data transmission system between a kind of base station and the base station controller, comprises:
Computing module is used for determining minimal chain way n according to the total length of described packet radio data and in-band information thereof and the bandwidth of Abis interface link;
Sending module is used for described packet radio data and in-band information thereof are sent from described n bar Abis interface link by n frame;
Receiver module is used for therefrom obtaining described packet radio data and in-band information by n the frame of described n bar Abis interface link reception from described sending module.
Wherein, described sending module also is used in the remaining bits of described frame except that described packet radio data and in-band information thereof frame sync identifications being set;
Described receiver module also is used for receiving this frame synchronously according to the frame sync identifications of described sending module setting.
In this external described system, described receiver module also is used for when described frame does not comprise described frame sync identifications, receives this frame synchronously according to the frame sync identifications and the frame timing cycle of the frame that receives before in the same Abis interface link.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, by determining minimal chain way n according to the length of packet radio data and in-band information thereof and the bandwidth of Abis interface link, transmitting terminal is transferred to receiving terminal with packet radio data and in-band information thereof by n Frame on the n bar Abis interface link; Receiving terminal receives n Frame by this n bar Abis interface link, and therefrom obtains this packet radio data and in-band information.Owing to can only comprise a cover in-band information in n the Frame, with carry in each frame in the prior art one the cover in-band information compare, significantly reduced and sent the shared bandwidth of in-band information, make identical packet radio data to transmit, saved the limited link circuit resource of eating dishes without rice or wine by Abis interface link still less.
When transmitting terminal also leaves remaining bits except that packet radio data or in-band information in Frame, frame sync identifications and/or filling bit are set in remaining bits, are not making receiving terminal to receive this Frame synchronously in the occupying volume external space according to frame sync identifications.
When not comprising frame sync identifications in Frame, receiving terminal receives this Frame synchronously according to the frame sync identifications and the frame timing cycle of the Frame that receives before in the same Abis interface link.Make that when not having remaining space in Frame, receiving terminal also can correctly receive this Frame, obtains packet radio data wherein.
Every the Abis link transmits the Frame that a frame comprises frame sync identifications at least in scheduled duration.Thereby make receiving terminal can regularly upgrade the time of its synchronous receiving data frame, prevent receiving terminal deviation lock in time, influence the Frame of receiving terminal accurate synchronization reception from the opposite end by long-term accumulated.
Description of drawings
Fig. 1 is the connection diagram of Abis interface in gprs system in the prior art;
Fig. 2 is according to packet radio data transmission method flow chart between the base station of first embodiment of the invention and the base station controller;
Fig. 3 is the reception schematic diagram according to Frame in the packet radio data transmission method between the base station of first embodiment of the invention and the base station controller;
Fig. 4 is according to packet radio data transmission system structure chart between the base station of second embodiment of the invention and the base station controller.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, transmitting terminal is divided into n Frame according to the length of packet radio data and in-band information thereof and the bandwidth of Abis interface link with this wireless packet data, wherein have only a Frame to carry in-band information, give receiving terminal by n bar Abis interface link transmission this n Frame; Receiving terminal receives n Frame by this n bar Abis interface link synchronization, therefrom obtains this packet radio data and in-band information.Owing to can only comprise a cover in-band information in n the Frame, with carry in each frame in the prior art one the cover in-band information compare, significantly reduced the shared bandwidth of transmission in-band information, made identical packet radio data to transmit by Abis interface link still less.
According to inventive principle packet radio data transmission method between first embodiment of the invention base station and the base station controller is described below.
In the present embodiment, the packet radio data are the RLC/MAC packet data block of non-modulated coding among the EGPRS.Specifically as shown in Figure 2, in step 210, transmitting terminal is determined minimal chain way n according to the total length of RLC/MAC packet data block and in-band information bit thereof and the bandwidth of Abis interface link.
Specifically, the transmitting terminal at first product of the bandwidth by the Abis interface link and frame timing cycle obtains the length V of the Frame on this Abis interface link, and the total length of this RLC/MAC packet data block and in-band information thereof is rounded up divided by V and with the merchant of gained obtains required minimal chain way n again.Such as, for the descending RLC/MAC packet data block under the MCS-9 code rate, its length is 1228bits, suppose that its in-band information bit length is 32bits, then amount to 1260bits, when this packet data block passes through the Abis interface link transmission of 16K, because Frame length V=16 * 20=320bits on the Abis interface link of 16K, the numerical value 4 that obtains after then the merchant that obtains divided by the length 320bits of Frame of the minimal chain way n of this packet data block total length 1260bits that is this data block and in-band information thereof rounds up.
Then enter step 220, transmitting terminal is with the Frame on this RLC/MAC packet data block and n 16K Abis interface link of in-band information formation thereof.Specifically, transmitting terminal is divided into n data sub-block with this RLC/MAC packet data block, and each data sub-block length is all smaller or equal to the length V of Frame, each data sub-block can be five equilibrium also can be not of uniform size.Form n Frame by this n data sub-block, the in-band information of this packet data block is carried in one of them Frame.Owing to only comprise a cover in-band information in n the Frame, with carry in each frame in the prior art one the cover in-band information compare, significantly reduced and sent the shared bandwidth of in-band information, make the packet radio data of identical size to transmit, saved the limited link circuit resource of eating dishes without rice or wine by Abis interface link still less.If in these Frames, except that data sub-block and in-band information, also have remaining bits, then in these remaining bits, frame sync identifications is set, if after frame sync identifications is set, also have remaining bits, then in these remaining bits, filling bit is set.Owing to only frame sync identifications and filling bit are set in remaining bits, are not making receiving terminal to receive this Frame synchronously in the occupying volume external space according to frame sync identifications
Then enter step 230, the n Frame after transmitting terminal will be provided with is given receiving terminal by the Abis interface link transmission of n bar 16K.
Then enter step 240, receiving terminal receives the Frame from each Abis interface link, judges in the Frame on each Abis interface link whether comprise frame sync identifications, if comprise then enter step 250, otherwise then enters step 260.
In step 250, receiving terminal receives Frame on this Abis interface link synchronously according to frame sync identifications.
In step 260, owing to do not comprise frame sync identifications in the Frame on the Abis interface link, receiving terminal receives this Frame synchronously according to frame sync identifications and the frame timing cycle in the Frame that receives before in the same Abis interface link.Such as, as shown in Figure 3, transmitting terminal is by the packet data block under Abis interface link 1 to the 4 transmission MCS-9 coded system, when receiving terminal receives each link, owing to do not comprise frame sync identifications in the Frame 2 on the Abis interface link 2, then the Frame that comprises frame sync identifications that receives according to the 3rd time slot before on this Abis interface link 2 of receiving terminal writes down the frame timing on this Abis interface link, and calculate the zero-time of this Frame 2 in conjunction with frame timing cycle 20ms, thereby synchronous receiving data frame 2, when guaranteeing that there is not remaining space in receiving terminal in Frame, also can correctly receive Frame from transmitting terminal.
Then enter step 270, receiving terminal obtains the sub-piece and the in-band information of this RLC/MAC packet data block from n the Frame that n bar Abis interface link is received, and, obtain this RLC/MAC packet data block, process ends according to the sub-piece of this in-band information reorganization gained.
What deserves to be mentioned is that every Abis link transmits the Frame that a frame comprises frame sync identifications at least in the present embodiment in scheduled duration.That is to say, at regular intervals, transmitting terminal transmits the Frame of a frame band frame sync identifications at least on 16K Abis interface link, so that receiving terminal can regularly upgrade the zero-time of its synchronous receiving data frame, prevent receiving terminal deviation lock in time by long-term accumulated, influence the Frame of receiving terminal accurate synchronization reception from the opposite end.
Realize that every Abis link transmits the method that a frame comprises the Frame of frame sync identifications at least and has multiple in scheduled duration.For example, can establish a timer for every Abis link, be length of timer with described scheduled duration, when having sent a frame that has a frame sync identifications in each Abis link, restarts corresponding timer.If timer expiry then suspends the transmission of current data, force to send a frame that has frame sync identifications.And for example, setting a unified periodicity timer, is length of timer with described scheduled duration, when this timer cycle is overtime, suspends the transmission of current data, forces to send a frame that has frame sync identifications.During described scheduled duration long enough, above-mentioned two schemes can be ignored to the influence of transfer of data.
The packet radio data transmission system comprises computing module, sending module and receiver module as shown in Figure 4 between second embodiment of the invention base station and the base station controller.Wherein, computing module is used for determining minimal chain way n according to the total length of packet radio data and in-band information thereof and the bandwidth of Abis interface link; Sending module is used for packet radio data and in-band information thereof are sent from n bar Abis interface link by n Frame; Receiver module is used for therefrom obtaining packet radio data and in-band information by n the frame of n bar Abis interface link reception from sending module.
Specifically, when needs transmission EGPRS packet radio data, the packet radio data transmission system is determined required minimal chain way n by computing module according to the total length of these packet radio data and in-band information thereof and the bandwidth of Abis interface link, by sending module these packet radio data and in-band information thereof are formed n Frame, in the remaining bits in formed Frame except that these packet radio data and in-band information thereof frame sync identifications and filling bit are set, and the Frame of the n after will being provided with sends to receiver module by n bar Abis interface link.Owing to only comprise a cover in-band information in n the Frame, with carry in each frame in the prior art one the cover in-band information compare, significantly reduced and sent the shared bandwidth of in-band information, make identical packet radio data to transmit, saved the limited link circuit resource of eating dishes without rice or wine by Abis interface link still less.At receiving terminal, for the Frame that comprises frame sync identifications, receiver module receives this Frame synchronously according to the frame sync identifications of this sending module setting; For the Frame that does not comprise frame sync identifications, receiver module receives current Frame synchronously according to the frame sync identifications and the frame timing cycle of the Frame that receives before in the same Abis interface link.Because when in Frame, not comprising frame sync identifications, receiving terminal also can correctly receive this Frame, obtain packet radio data wherein, make when there is not remaining space in transmitting terminal in Frame, need not to take additional space, further saved the required Abis interface link circuit resource of transferring data frames.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (9)
1. packet radio data transmission method between base station and the base station controller is characterized in that, comprises following steps:
Bandwidth according to Abis interface link between the total length of packet radio data and in-band information bit thereof and base station and the base station controller is determined minimal chain way n;
Transmitting terminal is transferred to receiving terminal with described packet radio data and in-band information bit thereof by n frame on the n bar Abis interface link;
Described receiving terminal receives a described n frame by described n bar Abis interface link, therefrom obtains described packet radio data and in-band information bit thereof.
2. packet radio data transmission method between base station according to claim 1 and the base station controller is characterized in that, the length V of described frame is the bandwidth of Abis interface link and the product of frame timing cycle;
Described minimal chain way n is rounded up divided by the merchant of V gained by the total length of described packet radio data and in-band information thereof and obtains.
3. packet radio data transmission method between base station according to claim 1 and the base station controller is characterized in that, also comprises following steps:
If in described frame, except that described packet radio data and in-band information thereof, also have remaining bits, then in these remaining bits, frame sync identifications is set, if after frame sync identifications is set, also have remaining bits, then in these remaining bits, filling bit is set;
Described receiving terminal receives this frame synchronously according to described frame sync identifications.
4. packet radio data transmission method between base station according to claim 3 and the base station controller, it is characterized in that, when not comprising described frame sync identifications in the described frame, described receiving terminal receives this frame synchronously according to frame sync identifications and the frame timing cycle in the frame that receives before in the same Abis interface link.
5. packet radio data transmission method between base station according to claim 4 and the base station controller is characterized in that, every described Abis link transmits a frame that comprises described frame sync identifications at least in scheduled duration.
6. according to packet radio data transmission method between each described base station and the base station controller in the claim 1 to 5, it is characterized in that described packet radio data are radio link control layer/MAC layer grouped datas of non-modulated coding in Enhanced GPRS or the GPRS.
7. packet radio data transmission system between base station and the base station controller is characterized in that, comprises:
Computing module is used for determining minimal chain way n according to the total length of described packet radio data and in-band information thereof and the bandwidth of Abis interface link;
Sending module is used for described packet radio data and in-band information thereof are sent from described n bar Abis interface link by n frame;
Receiver module is used for therefrom obtaining described packet radio data and in-band information by n the frame of described n bar Abis interface link reception from described sending module.
8. packet radio data transmission system between base station according to claim 7 and the base station controller, it is characterized in that described sending module also is used in the remaining bits of described frame except that described packet radio data and in-band information thereof frame sync identifications being set;
Described receiver module also is used for receiving this frame synchronously according to the frame sync identifications of described sending module setting.
9. packet radio data transmission system between base station according to claim 7 and the base station controller, it is characterized in that, described receiver module also is used for when described frame does not comprise described frame sync identifications, receives this frame synchronously according to the frame sync identifications and the frame timing cycle of the frame that receives before in the same Abis interface link.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009036681A1 (en) * | 2007-09-17 | 2009-03-26 | Huawei Technologies Co., Ltd. | A method, system and device for transmitting trau frame in packet network |
| CN101257657B (en) * | 2008-03-14 | 2012-02-29 | 上海华为技术有限公司 | Method, apparatus and system for code conversion and velocity adaptation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7181223B1 (en) * | 2000-06-21 | 2007-02-20 | Motorola, Inc. | Method for rapid uplink access by GSM GPRS/EDGE mobile stations engaged in voice over internet protocol packet transfer mode |
| SE0401669D0 (en) * | 2004-06-24 | 2004-06-24 | Ericsson Telefon Ab L M | Method and system for saving bandwidth |
| BRPI0419252A (en) * | 2004-12-28 | 2007-12-18 | Zte Corp | method for dynamically assigning open time for transmission time on abis interface of mobile communication system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009036681A1 (en) * | 2007-09-17 | 2009-03-26 | Huawei Technologies Co., Ltd. | A method, system and device for transmitting trau frame in packet network |
| CN101394336B (en) * | 2007-09-17 | 2012-02-22 | 华为技术有限公司 | Method, system and equipment for transmitting TRAU frame in packet network |
| US8295283B2 (en) | 2007-09-17 | 2012-10-23 | Huawei Technologies Co., Ltd. | Method, system, and device for transmitting TRAU frame over a packet network |
| CN101257657B (en) * | 2008-03-14 | 2012-02-29 | 上海华为技术有限公司 | Method, apparatus and system for code conversion and velocity adaptation |
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