CN100455038C - Method of data transmission in enhanced GPRS system - Google Patents

Abstract

The present invention relates to a data transmission method in a mobile communication system, which discloses a data transmission method for an enhanced general packet radio service system. The present invention enables the defined frame format (E_TRAU) of transmission codes and a control flow to complete the transmission of an EDGE service through links as few as possible. A brand new E_TRAU frame structure is designed by the data transmission method for an enhanced general packet radio service system so that the brand new E_TRAU frame structure is applicable to the EDGE service with various encoding modes; in order to transmit data as much as possible, E_TRAU frames of different types are used on each link in various encoding modes; a variable length method is used for indicating the encoding modes, and data bits which are originally idle are used as control bits.

Description

Data transmission method in the Enhanced GPRS system

Technical field

The present invention relates to the data transmission method in the mobile communication system, particularly the data transmission method between packet control unit and the enhancing transceiver station in the Enhanced GPRS system.

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.Belong 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.The radio link control of EDGE (Radio Link Control, being called for short " RLC ") some is different with GPRS, EDGE realizes higher bit rate by multi-slot operation (Multislot Connection), and by link circuit self-adapting (Link Adaptation, abbreviation " LA ") and progressively increase redundant (Incremental Redundancy, abbreviation " IR ") and control link-quality.The raising of RFDC speed has proposed new requirement to existing GSM network configuration, but because GPRS node, SGSN and GGSN are independent of subscriber data traffic speed more or less, so EDGE will not need to dispose new hardware.

Because the number of users of gsm system is bigger, thoroughly to regenerate be impossible in innovation, and EDGE can progressively introduce in existing network, changes also very for a short time, looked after operator and user's interests preferably.In addition, by revising modulation system, EDGE finally can be smoothly transitted into UMTS.EDGE also brings more wireless application to us, as radio multimedium, push mail and wireless video conference.The advantage of EDGE system has: system operation more flexibly, data transfer mode is various, support that high-speed packet inserts, communication system performance is better, support symmetry and asymmetric transmission, effectively reduce operation and access fee uses.

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 ").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.

Fig. 1 shows the building-block of logic of EGPRS system.Wherein SGSN links to each other by Gs interface and mobile switching center (Mobile Switching Center/Visit Location Register is called for short " MSC/VLR "); Interconnect by Gp between the GGSN in SGSN and other Public Land Mobile Nerwork (Public Land MobileNetwork is called for short " PLMN "); SGSN links to each other with GGSN by gn interface, and GGSN then connects by Gi interface and public data network (Public Data Network is called for short " PDN "); SGSN links to each other by Gd interface and short message service center's (Short Message Center is called for short " SMC "); SGSN is by Gr interface and attaching position register (Home LocationRegister is called for short " HLR ").Interface between GSM base station sub-system (Base Station Subsystem is called for short " BSS ") and the core net is a Gb Interface in addition, and directly the equipment that links to each other is exactly SGSN; And the wave point of GSM is the Um Interface between BSS and the portable terminal (Mobile Terminator is called for short " MT ").SGSN finishes the route and the functions such as forwarding, encryption and authentication, session management, mobile management, Logical Link Management, ticket generation and output of packet data package in network, be in core position.

EDGE mainly is Abis interface to the influence of gsm system architecture.Abis interface is the interface between base station and the base station controller, observes the ISDN(Integrated Service Digital Network) data link layer protocol of (Integrated Service DigitalNetwork is called for short " ISDN "), is used to provide D path data link to connect; Frame boundary location, order control; Error detection occurs and control; Functions such as flow control.In the gsm system, the physical layer of the Abis interface between BSC and the BTS is E1, and protocol layer is code check adaptation unit (TransferRate Adapter Unit is called for short " TRAU ") frame structure.In general the speed of trau frame is 16K, also is each link transmit-receive 320bit data of 20ms.The trau frame structure of forming at this 320bit 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 (Packet ControlUnit 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. 2 shows Abis interface present position in gprs system.In the EGPRS system, the CCU of described BTS inside is enhanced transceiver station (Enhanced Transceiver, be called for short " ETRX ") and replaces, so data transmission method is also referred to as data transmission method between PCU and the ETRX on the Abis interface.The EGPRS system is the system that upgrading forms on gprs system, and basic framework is constant, and the hardware of PCU is constant, a upgrade software, and the software and hardware of ETRX is all upgraded.

In order to finish gprs service, at People's Republic of China's patent " the transfer of data implementation method in the gprs system between CCU and PCU " (application number: 00100063.2) in the described technical scheme, design Z_TRAU frame structure and the synchronous flow process of relevant control, realized the transfer of data of Abis interface in the gprs service.In the described gprs system between CCU and PCU the implementation method of transfer of data may further comprise the steps: the transmission code frame format (Z_TRAU) that is provided with between CCU and the PCU is made up of frame head, control bit and data bit; Wherein, the piece of transmission block number in transmission channel coding mode, the current data position in control bit, and when up between transmission CCU and the PCU the current piece of transmission block of wanting synchronous; In addition, when transmitting uplink data, transmitting burst pulse train type in the control bit when being normal burst pulse train, also will be transmitted this transmission frame type, the quality of reception, received signal intensity, and data bit is determined according to above-mentioned channel coding method; When being access burst pulse train, also to transmit the number of access burst pulse train of figure place, the decoding success of Packet Random Access Channel, data bit is then transmitted corresponding access burst pulse train; When downlink data transmission, burst sequence type position is empty in the above-mentioned control bit.In the Z_TRAU frame structure, defined control bit first and second the position (C1 C2) is used to indicate used coding and decoding scheme: CS-1, CS-2, CS-3, CS-4.

Present trau frame structure and method for synchronous can be competent at gprs service.But in the EGPRS system, if provide EDGE business with this method, following problem occurs: at first, because EDGE coding and decoding scheme kind has increased by 9 kinds, feasible indicating means for coding and decoding scheme just needs to revise; Secondly, the data that the coded system that has need be transmitted are a lot, and a link can't in time be finished, so also need secondary link to come together to finish transmission except primary link.So, since EDGE business datum amount increase the increase in demand that makes to the 16k link of physical layer, the e1 resource that also promptly needs increases.Such as, the MCS-6 coded system, the up transmission 631bits that needs, the descending transmission 622bits that needs, according to existing method, there is 280bits each Z_TRAU frame data position, except primary link, at least also needs 2 secondary links just can satisfy the demand so.If but optimize the trau frame structure, analyze from all 320bits of each trau frame, can be only finish the transmission of MCS-6 with a primary link and secondary link.

In actual applications, there is following problem in such scheme: when being applied in the EGPRS system, the kind of coding and decoding scheme can't be indicated, and has caused the waste of physical layer E1 link circuit resource, has increased operating cost of operator.

Cause the main cause of this situation to be, current Z_TRAU frame structure and method for synchronous are not supported for the EDGE business in the EGPRS system at the gprs service design; And the design underaction of Z_TRAU frame structure, cause the waste of physical layer link resource.

Summary of the invention

In view of this, main purpose of the present invention is to provide the data transmission method in a kind of Enhanced GPRS system, makes and uses defined transmission code frame format (E_TRAU) and control flow can finish the transmission of EDGE business with few link of trying one's best.

For achieving the above object, the invention provides the data transmission method in a kind of Enhanced GPRS system, described Enhanced GPRS system comprises packet control unit and strengthens transceiver station, comprises following steps:

A is provided with between described packet control unit and the described enhancing transceiver station transmission code frame format for strengthening the code check adapter unit frame, and described enhancing code check adapter unit frame comprises up, descending Frame load mode and content; Adopt elongated method indication coded system; Use data bit Central Plains spare bits transmission data;

B selects the described enhancing code check adapter unit frame of respective type to carry out transfer of data on each the bar link under the various coded systems as required;

C is according to the enhancing code check adapter unit frame of described setting, interface flow process with described enhancing code check adapter unit frame transmission data is set between described enhancing transceiver station and the described packet control unit, is used to describe sequential and step that described enhancing transceiver station and described packet control unit are handled described all kinds enhancing code check adapter unit frame.

Wherein, the link under various coded systems described in the step B is divided into two kinds of primary link and secondary links at least; Described steps A comprises following substep:

Three types described enhancing code check adapter unit frame is set, is applied on each the bar link under the described various coded system;

Wherein, the frame length of described enhancing code check adapter unit frame is 40 bytes;

First kind of enhancing code check adapter unit frame divides information frame and Frame, comprises frame head, control bit, data bit;

Described frame head is used to carry out frame synchronization; Indication is Frame or information frame in described control bit, if Frame then also need be indicated its coded system, if information frame then also need be indicated its expansion type; Transmission block number in described control bit;

And, when described first kind of enhancing code check adapter unit frame transmits, also comprise following steps on primary link:

When transmitting uplink data, transmitting burst pulse train type in described control bit, if normal burst pulse train, then also need: the transmission block synchronizing information, and indicate this frame whether successfully decoded, the data bit of Frame is according to form transmission data, received signal quality, the received signal intensity of corresponding encoded mode defined simultaneously, and the data bit of information frame is transmitted corresponding information; If access burst pulse train, the access burst pulse train number that then also needs transmission success decoding, and the figure place of indication Packet Random Access Channel, the data bit of Frame is transmitted the burst sequence of corresponding number simultaneously, and the data bit of information frame is transmitted corresponding information;

When downlink data transmission, also transmission power control information, modulation type information in described control bit, and the data bit of Frame is according to the form transmission data of respective coding mode defined, the data bit of information frame is transmitted corresponding information;

Second kind of enhancing code check adapter unit frame comprises control bit and data bit, indicates coded system in described control bit; In addition, described control bit transmission received signal quality, received signal intensity when transmitting uplink data, described control bit transmits next up burst sequence type, next modulation type of up, power control information when downlink data transmission; The form transmission data that described data bit is stipulated according to the corresponding encoded mode;

The third strengthens the code check adapter unit frame and comprises data bit, and the form according to corresponding encoded mode defined in described data bit transmits data.

Described coded system comprises: CS-1, CS-2, CS-3, CS-4, MCS-1, MCS-2, MCS-3, MCS-4, MCS-5, MCS-6, MCS-7, MCS-8, MCS-9, and CS-1, CS-2, CS-3, MCS-1, MCS-2 only need a primary link; CS-4, MCS-3, MCS-4, MCS-5, MCS-6 need 1 primary link and 1 secondary link; MCS-7 needs 1 primary link and 2 secondary links; MCS-8, MCS-9 need 1 primary link and 3 secondary links.

Described first kind of enhancing code check adapter unit frame is made up of 20 words, wherein,

When on primary link, transmitting, everybody is the 0th word the 0, the 1st word and the 2nd word the 0th and is 1, form frame head by these positions, the the 1st to 15 the 1st to 15 of being respectively control bit of the 1st word, the the 1st to 7 of the 2nd word is the 16th to 22 of control bit, the 8th since the 2nd word is data bit up to frame end backward, is respectively the 1st to 280 of data bit;

The 1st version that gets up to represent the E_TRAU frame to the 3rd bit combination of control bit is set;

If transmission is information frame then the 4th of control bit is set is 0, the 5th to 8 that control bit is set for empty, and the 9th to 12 bit representation information frame expansion type of control bit is set;

If transmission is Frame then the 4th of control bit is set is 1, the 5th to 8 bit combination that control bit is set gets up to represent various coded systems, be provided with control bit the 9th to 12 bit representation control bit check and;

The get up current piece that will transmit number of the 13rd to 16 bit combination that control bit is set;

When uplink, two kinds of burst sequence types of the 21st bit representation transmission of control bit are set: on duty is 1 o'clock, is normal burst pulse train, and on duty is 0 o'clock, is access burst pulse train;

When uplink, under described normal burst pulse train situation, be provided with the 22nd of control bit represent current frame be successfully decoded Frame or decoding failure after the information frame filled out; The the 17th to 20 bit combination that control bit is set gets up to represent described enhancing transceiver station and described packet control unit is current wants the piece between the transmission block poor, and this moment, being provided with according to coded system of data bit finished;

When uplink, under described access burst pulse train situation, the figure place of the 22nd bit representation Packet Random Access Channel of control bit is set; The the 17th to 20 bit combination that control bit is set gets up to represent the number of the access burst pulse train of decoding success, the the 1st to 48 of data bit is the 1st access burst pulse train at this moment, the the 49th to 96 of data bit is the 2nd access burst pulse train, the the 97th to 144 of data bit is the 3rd access burst pulse train, and the 145th to 192 of data bit is the 4th access burst pulse train;

When downlink transfer, the the 17th to 20 bit combination that control bit is set gets up to represent the power controlling grade of described enhancing transceiver station, the 21st of control bit is not had definition, the modulation system of the next uplink data block of the 22nd bit representation of control bit is set, and being provided with according to coded system of data bit finished;

When on secondary link, transmitting, form frame head, the 1st to 13 the 1st to 13 of being respectively control bit of the 1st word for the 0th of the 0th word and the 1st word; The 14th since the 1st word is data bit up to frame end backward, is respectively the 1st to 290 of data bit;

Be provided with the 1st of control bit and get up to represent the current piece that will transmit number to the 4th bit combination; The the 5th to 12 bit combination that control bit is set get up to represent verification and; The 13rd that control bit is set for empty;

When uplink, the 1st to 4 bit combination that data bit is set gets up to represent described enhancing transceiver station and described packet control unit is current wants the piece between the transmission block poor; When up-downgoing was transmitted, being provided with according to coded system of other data bit finished;

And described first kind strengthens the code check adapter unit frame at CS-4, MCS-3, MCS-4, MCS-5, the secondary link transmission of MCS-8.

Described second type of enhancing code check adapter unit frame is made up of 20 words, in the primary link of CS-3, MCS-6, MCS-7, transmit, adopt the different coded system of variable-length encoding indication: if coded system is CS-3, the 1st that this frame then is set is 1, and all the other positions all can be used to transmit data and control information; Otherwise the 1st that this frame is set is 0, and then is that MCS-6 or MCS-7 are provided with the 2nd, 3 according to coded system, 10 expression MCS-6,11 expression MCS-7;

When coded system is CS-3, the 2nd bit representation verification of this frame and, in the transmitting uplink data, the 3rd to 5 bit representation received signal quality is got 4 idle data bit representation received signal intensity; In the downlink data transmission, the 3rd next up burst sequence type of indication, the 4th next up modulation type of indication, the 5th and 4 idle data positions be transmission power control information together;

When coded system is MCS-6 or MCS-7, this frame the 4th bit representation verification and, in the transmitting uplink data, the 5th, 6 the two gap informations of transmission, the 7th to 9 transmission received signal quality, the spare bits transmission received signal intensity of the position of fetching data and piece number; In the transmitting uplink data, the 5th next up burst sequence type of indication, the 6th next up modulation type of indication, the 7th to 14 next two gap information of up of transmission, the 15th to 18 transmission power control information.

Described the third type strengthens the code check adapter unit frame to be made up of 20 words, is data bit all, is used to transmit in MCS-6, MCS-7, the secondary link of MCS-9.

Described information frame comprises 5 kinds of expansion types: synchronization frame, quick synchronization frame, idle information frame, test frame, Operation and Maintenance frame.

Described step C comprises following substep:

Formulate the link initialization flow process, that link is carried out initialization is synchronous by sending described synchronization frame;

Formulate the fast synchronous flow process of link, realize the synchronous recovery of link under the abnormality, wherein in the data bit of described quick synchronization frame, carry link statistics information by sending described quick synchronization frame;

Formulate the link idle flow process,, wherein in the data bit of described idle information frame, carry link statistics information by sending the synchronous regime that idle information frame is checked link when the link idle state;

The synchronously unusual flow process of formulation is used for occurring alarming and handling unusually and under the situation about can't recover synchronously;

Formulate the Link State testing process, detect the state of link by sync status and check results, wherein said enhancing transceiver station is given described packet control unit by transmitting idle information frame reporting links state information;

Formulate testing process,, finish link performance evaluation and test and fault and solve by the issuing and return and test of detecting information frame;

Formulate the Operation and Maintenance flow process, issuing and returning and realize attendant's Operation and Maintenance to described enhancing transceiver station on described packet control unit platform by the Operation and Maintenance frame;

Formulate data traffic flows, be used to transmit data, comprise following steps: transmit leg transmits with data encapsulation and on link according to described enhancing code check adaptation unit frame format, and the recipient receives and according to described this frame of enhancing code check adaptation unit frame format decapsulation.

By relatively finding that technical scheme difference with the prior art of the present invention is that the present invention designs brand-new E_TRAU frame structure, make it be applicable to the EDGE business of various coded systems; For transmission data as much as possible, the present invention uses dissimilar E_TRAU frames on each the bar link under the various coded systems, has also adopted elongated method indication coded system, has used as control bit with idle originally data bit; In addition, the present invention has also formulated a series of control flow, as the synchronous flow process of link initialization, the fast synchronous flow process of link, link idle flow process, synchronously unusual flow process, Link State testing process, testing process, Operation and Maintenance flow process and data traffic flows etc., with solving problems such as E_TRAU frame synchronization, professional transmission, link management and Operation and Maintenance.

Difference on this technical scheme, bring comparatively significantly beneficial effect, promptly made gprs system on the basis of former network architecture and PCU hardware, to use the transfer of data between method realization PCU of the present invention and the ETRX, EDGE is provided business, upgrades to the EGPRS system; Simultaneously, make that the transfer of data on the Abis interface is more convenient, efficient, reliable; And used physical layer E1 link circuit resource when having significantly reduced the transfer of data on Abis interface has reduced the operation cost of communication system.

Description of drawings

Fig. 1 is the building-block of logic of EGPRS system;

Fig. 2 is Abis interface present position schematic diagram in the EGPRS system;

Fig. 3 is according to an embodiment of the invention and requires schematic diagram synchronously.

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.

The present invention has designed new trau frame structure, be called and strengthen code check adaptation unit (EnhancedTransfer Rate Adapter Unit, be called for short " E_TRAU ") frame, comprise up, descending Frame load mode and content, make it be applicable to the EDGE business of various coded systems; Adopt elongated method indication coded system simultaneously, saved control bit quantity, made the needed physical layer link of the various data of transmission few as far as possible; Used data bit Central Plains spare bits transmission data, few link of having realized trying one's best is finished the transmission of various coded system frames; And formulated control flow and solved various trau frames, particularly do not had the stationary problem of the trau frame of synchronous head, and problems such as professional transmission, link management.

In one embodiment of the invention, for satisfying the different demands of multilink under the various coded systems, three types ETRX and the transfer of data sign indicating number frame format (E_TRAU) between the PCU are set.All E_TRAU frames are formed by 40 bytes (20 words).Wherein, first kind of E_TRAU frame is made up of frame head, control bit and data bit; Second kind of E_TRAU frame is made up of control bit and data bit; The third E_TRAU is made up of data bit.

According to analysis, under 13 kinds of coded systems, CS-1, CS-2, CS-3, MCS-1, MCS-2 only need a link, i.e. 1 primary link; CS-4, MCS-3, MCS-4, MCS-5, MCS-6 need 2 links, i.e. 1 primary link and 1 secondary link; MCS-7 needs 3 links, i.e. 1 primary link and 2 secondary links; MCS-8, MCS-9 need 4 links, i.e. 1 primary link and 3 secondary links.

The present invention uses dissimilar E_TRAU frame formats with the major-minor link that the restriction of data capacity is distributed under the various coded systems according to actual needs.In one embodiment of the invention, it is as follows to define the frame format that the major-minor link of various coded systems uses: second kind of E_TRAU frame only is used for the primary link transmission, comprises CS-3 primary link, MCS-6 primary link, MCS-7 primary link; The third E_TRAU frame only is used for secondary link transmission, comprises the secondary link of MCS-6, the secondary link of MCS-7, the secondary link of MCS-9; And all the other links all adopt first kind of E_TRAU frame transmission.

At first set forth the definition of first kind of E_TRAU frame below.As previously mentioned, because first kind of E_TRAU frame may be used in primary link and secondary link, so divide the major-minor link two kinds of situation explanations here.

Table one shows, in one embodiment of the invention, and the frame format when first kind of E_TRAU frame is used to the primary link transmission and content-defined.Wherein form frame head for the 0th of the 0th word and the 1st, 2 words the, be used for synchronous detecting, so also claim synchronous head; The the 1st to 15 of the 1st word is respectively control bit C1-C15, and the 1-7 position of the 2nd word is control bit C16-C22; The 8th since the 2nd word is data bit up to frame end backward, is respectively D1-D280.

Table one

Table two, table three show, in one embodiment of the invention, and each control bit when first kind of E_TRAU frame is used to the primary link transmission, the detailed establishing method and the meaning of data bit.

Wherein, the 0th word everybody to be 0, the 1 word and the 2nd word the 0th be 1, by the frame head of these hyte cost frames, be used for determining the border of each E_TRAU frame, and extract each complete E_TRAU frame.

When up-downgoing is transmitted, be provided with the 1st of control bit to the 3rd (C3C2C1) the combine version of expression E_TRAU frame.

When up-downgoing is transmitted, the 4th (C4) of control bit according to circumstances is set, if being Frame then being set to 1 of transmission, if being information frame then being set to 0 of transmission.Information frame does not comprise data.

When up-downgoing is transmitted, be provided with the 5th of control bit to the 8th (C8C7C6C5) the various coded systems of expression that combine.

When up-downgoing is transmitted, the 9-12 position (C12C11C10C9) of control bit according to circumstances is set, when C8C7C6C5=1111, the expansion of C12C11C10C9 combination expression information frame type; Other situation be provided with C12C11C10C9 represent control bit check and, be used for the control bit error correction.

When up-downgoing is transmitted, the 13-16 position (C16C15C14C13) that control bit is set combine expression ETRX or the current piece that will transmit of PCU number.

When uplink, the setting of the 17-20 position (C20C19C18C17) of control bit is relevant with the burst sequence, mentions hereinafter; When downlink transfer, the 17-20 position (C20C19C18C17) that control bit is set combines and represents the power controlling grade of ETRX.

When uplink, two kinds of burst sequence types of the 21st (C21) expression transmission of control bit are set: on duty is 1 o'clock, is normal burst pulse train (Normal Burst, be called for short " NB "), on duty is 0 o'clock, is access burst pulse train (Access Burst is called for short " AB ").

During uplink, under described NB situation, the 22nd (C22) that control bit is set represent current frame be successfully decoded Frame or decoding failure after the information frame filled out; Combine expression ETRX and PCU is current wants the piece between the transmission block poor of the 17-20 position (C20C19C18C17) that control bit is set, it is synchronous to be used for piece; This moment, being provided with according to coded system of data bit finished, and method to set up is referring to table three in detail.

During uplink, under described AB situation, the figure place of the 22nd (C22) expression Packet Random Access Channel (Packet Random Access Channel is called for short " PRACH ") of control bit is set; The combine number of access burst pulse train of expression decoding success of the 17-20 position (C20C19C18C17) that control bit is set; This moment, the 1-48 position of data bit was the 1st an access burst pulse train, the 49-96 position of data bit is the 2nd an access burst pulse train, the 97-144 position of data bit is the 3rd an access burst pulse train, and the 145-192 position of data bit is the 4th an access burst pulse train.

When downlink transfer, the 21st (C21) of control bit do not have definition, and the next uplink data block of the 22nd (C22) expression that control bit is set is GMSK modulation or 8PSK modulation.Being provided with to adopt according to coded system of data bit finished, and method to set up is referring to table three in detail.

Table two

Table three

Table four shows, in one embodiment of the invention, and the frame format when first kind of E_TRAU frame is used to secondary link transmission and content-defined.Wherein form frame head for the 0th of the 0th word and the 1st word the, be used for synchronous detecting; The 1-13 position of the 1st word is respectively control bit C1-C13; The 14th since the 1st word is data bit up to frame end backward, is respectively D1-D290.

Table four

In one embodiment of the invention, the detailed establishing method and the meaning of each control bit when first kind of E_TRAU frame is used to secondary link transmission are as follows: everybody of the 0th word is 0, the 0th of the 1st word is 1, form frame head, be used for determining the border of each E_TRAU, to utilize each the complete E_TRAU frame that extracts on the secondary link; When up-downgoing is transmitted, be provided with the 1st of control bit to the 4th (C4C3C2C1) combine expression ETRX or the current piece that will transmit of PCU number; When up-downgoing is transmitted, be provided with the 5th to 12 of control bit (C12～C5) combine the vice link verification and; The 13rd that control bit is set for empty.

Table five shows, in one embodiment of the invention, and the detailed establishing method and the meaning of each data bit when first kind of E_TRAU frame is used to secondary link transmission.When uplink, (combine expression ETRX and PCU is current wants the piece between the transmission block poor of D4～D1), it is synchronous to be used for piece to be provided with the 1st to 4 of data bit.When up-downgoing was transmitted, being provided with according to coded system of other data bit finished.

Table five

Coded system	Up	Descending
			MCS-8	D1～D290: data bit	D1～D290: data bit
MCS-5	D4～D1: the synchronous D5～D42 of piece: spare bits	D1～D42: spare bits D43～D290: data bit

	D43～D290: data bit
			MCS-4	D4～D1: the synchronous D5～D146 of piece: spare bits D147～D290: data bit	D1～D146: spare bits D147～D290: data bit
MCS-3	D4～D1: the synchronous D5～D202 of piece: spare bits D203～D290: data bit	D1～D202: spare bits D203～D290: data bit
			CS-4	D4～D1: the synchronous D5～D114 of piece: spare bits D115～D290: data bit	D1～D114: spare bits D115～D290: data bit

Set forth the definition of second kind of E_TRAU frame below.As previously mentioned, second kind of E_TRAU frame is made up of control bit and data bit, do not have frame head.Be used in CS-3, MCS-6, the MCS-7 primary link.

In one embodiment of the invention, pass CS-3 with 1 16k link, so descending have only 5 bits vacant, adds 3 original idle bits, has 8 bits to can be used as the control bit order that is used for delivering a letter.In addition, finish MCS-6 with 2 16k links, 3 16k links are finished MCS-7, and the both of these case remaining bits also seldom.The present invention adopts does not have the E_TRAU of frame head to transmit the frame of these three kinds of coded systems, and adopts elongated method to indicate different coded systems.

The resource of considering CS-3 is the most nervous, so represent whether be CS-3:H1=1 with first bit H1 of every frame, then is the frame of CS-3 coded system; H1=0 then is not the frame of CS-3 coded system.The bit that can then see the back determines it is the frame of which kind of coded system.When H1=0, judge whether it is that MCS-6, MCS-7:H1H2H3=010 represent MCS-6 according to H2H3 again; H1H2H3=011 represents MCS-7.Being provided with here can prevent to occur erroneous judgement under the slip situation, such as when representing that with 01 MCS-6,001 represents MCS-7, when slip occurring, is easy to 001 as 01.

Set forth under CS-3, MCS-6, three kinds of situations of MCS-7 the structure of described second kind of E_TRAU frame and definition below respectively.

Table six shows second kind of E_TRAU frame structure of CS-3 coded system, and table seven shows second kind of E_TRAU frame everybody definition and the method to set up of CS-3 coded system.Here owing to there not being unnecessary bit to pass Timing Advance and Timing Advance deviation, so will limit under two time slot situations professional without the CS-3 biography at PCU.

Table six

Table seven

Table eight shows second kind of E_TRAU frame structure of MCS-6 coded system, up-downgoing difference; Table nine shows second kind of E_TRAU frame everybody definition and the method to set up of MCS-6 coded system.

Table eight

Table nine

Table ten shows second kind of E_TRAU frame structure of MCS-7 coded system, up-downgoing difference; Table ten one shows second kind of E_RAU frame everybody definition and the method to set up of MCS-7 coded system.

Table ten

Table ten one

Elaborate the definition of the third E_TRAU frame below.As previously mentioned, the third E_TRAU frame only is made up of data bit, does not have frame head and control bit.Be used in MCS-6, MCS-7, the secondary link of MCS-9, in one embodiment of the invention, the third E_TRAU frame format under three kinds of coded systems is all identical, and every of the 0-19 word is data bit, is respectively D0-D320 since the 0th of the 0th word to frame end.

Elaborate the formal definition of the information frame in aforementioned first kind of E_TRAU frame below.What in one embodiment of the invention, the frame format of information frame and table one were described is identical; Realize the control method for synchronous because information frame is specifically designed to, the detailed establishing method of its each control bit, data bit and meaning are as providing in table ten two.Here the establishing method of data bit provides at synchronization frame etc., need carry information for other information frames, such as statistical information or Debugging message, then sets forth in the explanation of related procedure.

Table ten two

Information frame is used to realize control flow.According to the difference of information expansion type, can be divided into the information frame of different purposes, in one embodiment of the invention, information frame comprises: synchronization frame, quick synchronization frame, free time (Idle) information frame, test frame, Operation and Maintenance frame.The information frame of different expansion types is used to corresponding control flow involved in the present invention respectively.Setting meaning and using method about information frame will be set forth in related procedure.

In one embodiment of the invention, according to the definition of above-mentioned E_TRAU frame, formulated relevant control method for synchronous.Elaborate below, between ETRX and PCU,, comprising: the synchronous flow process of link initialization, the fast synchronous flow process of link, link idle (Idle) flow process, synchronously unusual flow process, Link State testing process, testing process, Operation and Maintenance flow process and data traffic flows with the interface flow process of E_TRAU transmission frame number certificate.The method and the sequential of three kinds of E_TRAU frames of processing of these flow processs regulation ETRX and PCU.

Elaborate each control flow below respectively.

The synchronous flow process of link initialization is the synchronizing process that is used to finish at the beginning of the link establishment.Comprise that synchronously frame synchronization and piece are synchronous, frame synchronization is used to guarantee that PCU and BTS can determine the original position of trau frame, comes the content of true parse for frame simultaneously according to the frame structure of this interface protocol definition.Piece is used for guaranteeing synchronously, PCU finishes RLC, medium access control (Media Access Control is called for short " the MAC ") data block of processing, behind the process transmission delay, all channel links can arrive BTS on appropriate opportunity, and are just in time corresponding with the frame number of radio open.Initialization link or newly-increased link all will carry out the synchronous flow process of link initialization.This flow process is exactly that PCU and BTS are undertaken by sending synchronization frame.The employed information frame expansion type of this flow process is a synchronization frame.

New EDGE coded system requires the data of transmission too many, and the remaining signaling bit of Abis interface causes some type of service not have synchronous head such as the Frame of MCS6 and MCS7 very little.The method of frame synchronization will be in two kinds of situation like this: first kind of situation, and the Frame that synchronous head arranged is the search synchronous head earlier, just can find complete trau frame then; Second kind of situation do not have the Frame of synchronous head must know the synchronous head position of each link earlier, is the border of E_TRAU frame with this location definition, had this border just can obtain complete E_TRAU frame.The synchronous flow process of link initialization is necessary for the frame synchronization of second kind of situation, before passing data, to carry out initialization earlier and allow two ends all know the place, position of synchronous head, thereby determine that according to this position frame boundaries obtains complete Frame after receiving the Frame that does not have synchronous head then with a kind of information frame of self-defining band synchronous head.

In addition, Fig. 3 shows according to an embodiment of the invention synchronous requirement.When downlink coding, if receive a complete E_TRAU frame at least on all links, and piece is number identical, simultaneously and the frame number correspondence of eating dishes without rice or wine, illustrates that then PCU and BTS have gone up synchronously.Here can carry out separately synchronously by by-link, promptly newly-increased link all will carry out the synchronous flow process of link initialization.The time bunch information of the frame number information that transmits of synchronization frame and PCU is that piece uses when synchronous in this example.Certain piece also can pass other information synchronously and realize with additive method.

In one embodiment of the invention, PCU and BTS only just search for synchronous head on a large scale when the synchronous flow process of link initialization, other flow process all be about original sync bit among a small circle in the search.Fall data or signaling very lowly when the probability of synchronous head when the benefit of doing like this is transmitting-receiving out of Memory frame or Frame.And the design of aforementioned synchronizing information frame has avoided occurring 16 0 situation of asynchronous head just.

In one embodiment of the invention, do not tear chain open and do not have transfer of data, will receive and dispatch synchronization frame yet, be used to check whether link condition and synchronous head position change when link.

The link effect of flow process synchronously fast is, when occurring making BTS asynchronous with PCU unusually in communication process, weighs apace and sets up synchronous regime earlier, and upload statistical information by way of parenthesis.Such as, when frame transmission slide block or BTS occur and do not have correct decoding,, report a quick synchronization frame by BTS in order to shorten lock in time, finish the heavy of synchronous regime and set up earlier, and statistical information is attached in the data bit of quick synchronization frame and is uploaded to PCU.Here link statistics information can be: receive number of times, link error rates of the quantity of various frames, the quantity that sends various frames, TRAU link abnormality processing or the like.And PCU handles after receiving this quick synchronization frame, thereby makes the link-recovery synchronous regime.This flow process information needed frame expansion type is quick synchronization frame.

Wherein, the situation of slide block is meant owing to make synchronously the piece of communicating pair transmission number differ 1 unusually, such as: the clock of eating dishes without rice or wine of physical layer link E1 clock and BTS is asynchronous, accumulated certain hour after, BTS will adjust the reception that E1 receives data, so just slide block may occur; Perhaps the synchronous head of the synchronous head of newly-increased link and other link differs greatly, and has surpassed certain scope, so also can occur satisfying the requirement that earlier figures 3 is described, and BTS also slide block can occur after adjustment so.

Link idle (Idle) flow process is used for checking the synchronous regime of link when link is in idle condition.Finish link initialization synchronously after, the state that may occur link idle in the communication process, temporarily there is not data block to transmit or the previous up residing state of link when not deciphering such as both sides, under idle condition, the link idle flow process makes and not only is used to idle link transceiving idle (Idle) information frame check the link synchronization state but also transmits aforementioned link statistics information.The expansion type of the information frame that this flow process is used is idle (Idle) information frame.

In one embodiment of the invention, the statistical information that data bit transmitted of idle (Idle) information frame is shown in table ten three.Those of ordinary skill in the art are appreciated that the setting of information frame content that data bit transmits can design according to actual needs here, are used for the transmission link statistical information, do not influence the spirit and scope of the invention.

Table ten three

Synchronously unusual flow process is used for occurring alarming and handling unusually and under the situation about can't recover synchronously.Such as, under the situation of slip, original synchronous head positional information is not right, causes and can't correctly take out complete frame data.This is passing MCS-6, and MCS-7 etc. are fatal mistakes when not having the trau frame of synchronous head.If transmission is the coded system that synchronous head is arranged, after detecting the synchronous head position so and changing, readjust the synchronous head position, be not to carry out other processing at once.When transmission does not have the synchronous head trau frame, changing more fast if find the synchronous head position, such as variation in average per 10 minutes once, then PCU reports prompt alarm, and decision stops using the coded system that does not have synchronous head to transmit data.This flow process only detects and handles abnormality, does not transmit information frame.

The Link State testing process is used to detect the communication quality of link.The synchronous head of system by checking trau frame, verification and etc. information finish this flow process.In up link, when if PCU finds that checksum error is too many, or search in the time less than synchronous head at 16s always, then start the link initialization flow process earlier, send synchronization frame link is reinitialized, check the frame of receiving then, if can also receive synchronization frame, then continue the link initialization flow process, and carry out operate as normal; Otherwise think that this link broken, carry out corresponding other processing.In down link, BTS checks link, if communication disruption or wrong too many, then by would transmitting idle (Idle) information frame reporting links state.

Testing process is used to finish about link performance evaluation and test and fault solution.PCU can start testing process and locate some problems or measure some performance index.Such as, PCU issues the detecting information frame by the order platform, carries detecting information in the data bit of detecting information frame, BTS is according to receiving that the detecting information frame does corresponding processing, return the detecting information frame again, report test result, perhaps when loopback test, directly descending detecting information former state is returned.The information frame expansion type that this flow process is used is the detecting information frame.Those of ordinary skill in the art are appreciated that the detecting information that the data bit of described detecting information frame is carried can design voluntarily according to the test needs, and do not influence the spirit and scope of the invention.

The Operation and Maintenance flow process is used to realize attendant's Operation and Maintenance to BTS on the PCU platform.Basic process is to send downstream operation maintenance frame notice BTS by PCU order platform to begin to carry out the Operation and Maintenance flow process, and BTS return maintenance frame is given PCU and is presented on the PCU platform then.The expansion type of the information frame that this flow process is used is the Operation and Maintenance frame.The data bit of Operation and Maintenance frame is carried is the debug results information that the debug command that issues of PCU or BTS report.

Control flow noted earlier all is only to use information frame that link is controlled and managed.And data traffic flows is to finish the main flow process of transfer of data.When transmission EDGE was professional, PCU and ETRX carried out transfer of data according to aforesaid E_TRAU frame.Transmit leg passes data encapsulation according to aforementioned form with institute and becomes the E_TRAU frame and transmit on link, and the recipient receives this E_TRAU frame and according to aforementioned form decapsulation.

In the EGPRS system, packaged E_TRAU frame should comprise with the lower part: E_TRAU frame head, mac frame head, RLC frame head, llc protocol data unit when bottom transmits in order.Because mac frame head and RLC frame head are not the bit numbers of whole byte, in order to make PCU to handle by whole byte, in the preferred embodiment of the present invention, the method of idle bit is added in employing between self-defining control bit and data bit, make the end of data bit and the end of E_TRAU frame overlap just; Data for the major-minor link split, and then the forethought this point makes the various piece of last framing satisfy the requirement of whole byte.

Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.

Claims (8)

1. the data transmission method in the Enhanced GPRS system, described Enhanced GPRS system comprises packet control unit and strengthens transceiver station, it is characterized in that, comprises following steps:

A is provided with between described packet control unit and the described enhancing transceiver station transmission code frame format for strengthening the code check adapter unit frame, and described enhancing code check adapter unit frame comprises up, descending Frame load mode and content; Adopt elongated method indication coded system; Use data bit Central Plains spare bits transmission data; The enhancing code check adapter unit frame of described setting comprises three types, is applied on each the bar link under the various coded systems,

First kind strengthens the code check adapter unit frame and is divided into information frame and Frame, comprise frame head, control bit and data bit, described frame head is used for frame synchronization, and indication is Frame or information frame in described control bit, if Frame then also need be indicated its coded system, if information frame then also need be indicated its expansion type; Transmission block number in described control bit;

Second kind of enhancing code check adapter unit frame comprises control bit and data bit, indicates coded system in described control bit;

The third strengthens the code check adapter unit frame and comprises data bit, and the form according to corresponding encoded mode defined in described data bit transmits data;

B selects the described enhancing code check adapter unit frame of respective type to carry out transfer of data on each the bar link under the various coded systems as required; Described coded system comprises: CS-1, CS-2, CS-3, CS-4, MCS-1, MCS-2, MCS-3, MCS-4, MCS-5, MCS-6, MCS-7, MCS-8, MCS-9;

C is according to the enhancing code check adapter unit frame of described setting, interface flow process with described enhancing code check adapter unit frame transmission data is set between described enhancing transceiver station and the described packet control unit, is used to describe sequential and step that described enhancing transceiver station and described packet control unit are handled described all kinds enhancing code check adapter unit frame.

2. the data transmission method in the Enhanced GPRS according to claim 1 system is characterized in that, the link under various coded systems described in the step B is divided into two kinds of primary link and secondary links at least;

The frame length of described enhancing code check adapter unit frame is 40 bytes;

When described first kind of enhancing code check adapter unit frame transmits, also comprise following steps on primary link:

When transmitting uplink data, transmitting burst pulse train type in described control bit, if normal burst pulse train, then also need: the transmission block synchronizing information, and indicate this frame whether successfully decoded, the data bit of Frame is according to form transmission data, received signal quality, the received signal intensity of corresponding encoded mode defined simultaneously, and the data bit of information frame is transmitted corresponding information; If access burst pulse train, the access burst pulse train number that then also needs transmission success decoding, and the figure place of indication Packet Random Access Channel, the data bit of Frame is transmitted the burst sequence of corresponding number simultaneously, and the data bit of information frame is transmitted corresponding information;

When downlink data transmission, also transmission power control information, modulation type information in described control bit, and the data bit of Frame is according to the form transmission data of respective coding mode defined, the data bit of information frame is transmitted corresponding information;

Described second kind strengthens code check adapter unit frame described control bit transmission received signal quality, received signal intensity when transmitting uplink data, and described control bit transmits next up burst sequence type, next modulation type of up, power control information when downlink data transmission; The form transmission data that described data bit is stipulated according to the corresponding encoded mode;

3. the data transmission method in the Enhanced GPRS according to claim 2 system is characterized in that, in the described coded system, CS-1, CS-2, CS-3, MCS-1, MCS-2 only need a primary link; CS-4, MCS-3, MCS-4, MCS-5, MCS-6 need 1 primary link and 1 secondary link; MCS-7 needs 1 primary link and 2 secondary links; MCS-8, MCS-9 need 1 primary link and 3 secondary links.

4. the data transmission method in the Enhanced GPRS according to claim 3 system is characterized in that, described first kind strengthens the code check adapter unit frame and be made up of 20 words, wherein,

When on primary link, transmitting, everybody is the 0th word the 0, the 1st word and the 2nd word the 0th and is 1, form frame head by these positions, the the 1st to 15 the 1st to 15 of being respectively control bit of the 1st word, the the 1st to 7 of the 2nd word is the 16th to 22 of control bit, the 8th since the 2nd word is data bit up to frame end backward, is respectively the 1st to 280 of data bit;

The 1st version that gets up to represent the E trau frame to the 3rd bit combination of control bit is set;

If transmission is information frame then the 4th of control bit is set is 0, the 5th to 8 that control bit is set for empty, and the 9th to 12 bit representation information frame expansion type of control bit is set;

If transmission is Frame then the 4th of control bit is set is 1, the 5th to 8 bit combination that control bit is set gets up to represent various coded systems, be provided with control bit the 9th to 12 bit representation control bit check and;

The get up current piece that will transmit number of the 13rd to 16 bit combination that control bit is set;

When uplink, two kinds of burst sequence types of the 21st bit representation transmission of control bit are set: on duty is 1 o'clock, is normal burst pulse train, and on duty is 0 o'clock, is access burst pulse train;

When uplink, under described normal burst pulse train situation, be provided with the 22nd of control bit represent current frame be successfully decoded Frame or decoding failure after the information frame filled out; The the 17th to 20 bit combination that control bit is set gets up to represent described enhancing transceiver station and described packet control unit is current wants the piece between the transmission block poor, and this moment, being provided with according to coded system of data bit finished;

When uplink, under described access burst pulse train situation, the figure place of the 22nd bit representation Packet Random Access Channel of control bit is set; The the 17th to 20 bit combination that control bit is set gets up to represent the number of the access burst pulse train of decoding success, the the 1st to 48 of data bit is the 1st access burst pulse train at this moment, the the 49th to 96 of data bit is the 2nd access burst pulse train, the the 97th to 144 of data bit is the 3rd access burst pulse train, and the 145th to 192 of data bit is the 4th access burst pulse train;

When downlink transfer, the the 17th to 20 bit combination that control bit is set gets up to represent the power controlling grade of described enhancing transceiver station, the 21st of control bit is not had definition, the modulation system of the next uplink data block of the 22nd bit representation of control bit is set, and being provided with according to coded system of data bit finished;

When on secondary link, transmitting, form frame head, the 1st to 13 the 1st to 13 of being respectively control bit of the 1st word for the 0th of the 0th word and the 1st word; The 14th since the 1st word is data bit up to frame end backward, is respectively the 1st to 290 of data bit;

Be provided with the 1st of control bit and get up to represent the current piece that will transmit number to the 4th bit combination; The the 5th to 12 bit combination that control bit is set get up to represent verification and; The 13rd that control bit is set for empty;

When uplink, the 1st to 4 bit combination that data bit is set gets up to represent described enhancing transceiver station and described packet control unit is current wants the piece between the transmission block poor; When up-downgoing was transmitted, being provided with according to coded system of other data bit finished;

And described first kind strengthens the code check adapter unit frame at CS-4, MCS-3, MCS-4, MCS-5, the secondary link transmission of MCS-8.

5. the data transmission method in the Enhanced GPRS according to claim 3 system, it is characterized in that, described second type of enhancing code check adapter unit frame is made up of 20 words, in the primary link of CS-3, MCS-6, MCS-7, transmit, adopt the different coded system of variable-length encoding indication: if coded system is CS-3, the 1st that this frame then is set is 1, and all the other positions all can be used to transmit data and control information; Otherwise the 1st that this frame is set is 0, and then is that MCS-6 or MCS-7 are provided with the 2nd, 3 according to coded system, 10 expression MCS-6,11 expression MCS-7;

When coded system is CS-3, the 2nd bit representation verification of this frame and, in the transmitting uplink data, the 3rd to 5 bit representation received signal quality is got 4 idle data bit representation received signal intensity; In the downlink data transmission, the 3rd next up burst sequence type of indication, the 4th next up modulation type of indication, the 5th and 4 idle data positions be transmission power control information together;

When coded system is MCS-6 or MCS-7, this frame the 4th bit representation verification and, in the transmitting uplink data, the 5th, 6 the two gap informations of transmission, the 7th to 9 transmission received signal quality, the spare bits transmission received signal intensity of the position of fetching data and piece number; In the transmitting uplink data, the 5th next up burst sequence type of indication, the 6th next up modulation type of indication, the 7th to 14 next two gap information of up of transmission, the 15th to 18 transmission power control information.

6. the data transmission method in the Enhanced GPRS according to claim 3 system, it is characterized in that, described the third type strengthens the code check adapter unit frame to be made up of 20 words, is data bit all, is used to transmit in MCS-6, MCS-7, the secondary link of MCS-9.

7. the data transmission method in the Enhanced GPRS according to claim 2 system is characterized in that described information frame comprises 5 kinds of expansion types: synchronization frame, synchronization frame, idle information frame, test frame, Operation and Maintenance frame fast.

8. the data transmission method in the Enhanced GPRS according to claim 7 system is characterized in that described step C comprises following substep:

Formulate the link initialization flow process, that link is carried out initialization is synchronous by sending described synchronization frame;

Formulate the fast synchronous flow process of link, realize the synchronous recovery of link under the abnormality, wherein in the data bit of described quick synchronization frame, carry link statistics information by sending described quick synchronization frame;

Formulate the link idle flow process,, wherein in the data bit of described idle information frame, carry link statistics information by sending the synchronous regime that idle information frame is checked link when the link idle state;

The synchronously unusual flow process of formulation is used for occurring alarming and handling unusually and under the situation about can't recover synchronously;

Formulate the Link State testing process, detect the state of link by sync status and check results, wherein said enhancing transceiver station is given described packet control unit by transmitting idle information frame reporting links state information;

Formulate testing process,, finish link performance evaluation and test and fault and solve by the issuing and return and test of detecting information frame;

Formulate the Operation and Maintenance flow process, issuing and returning and realize attendant's Operation and Maintenance to described enhancing transceiver station on described packet control unit platform by the Operation and Maintenance frame;

Formulate data traffic flows, be used to transmit data, comprise following steps: transmit leg transmits with data encapsulation and on link according to described enhancing code check adaptation unit frame format, and the recipient receives and according to described this frame of enhancing code check adaptation unit frame format decapsulation.

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