CN1968198A - Wireless access loaded packet data service QoS management method. - Google Patents

Abstract

The invention relates to a QoS manage method of wireless access support group data service, wherein it comprises that: judging the service type of data supported by wireless access; based on said type, finding the sending priority of data pack; projecting the data pack with high priority to the channel with high priority, to be sent out. When the time delay demand of application service, based on the data flux of target address, classifying the priorities; projecting the data pack with low data flux to the logic channel with high priority, to confirm the application data pack with high time delay demand to be sent quickly, to meet the service quality QoS of different application services.

Description

A kind of QoS management method of wireless access loaded packet data service

Technical field

The present invention relates to communication technical field, specifically, relate to the QoS management method of wireless access loaded packet data service.

Technical background

Along with the development and the wireless communication technology evolution of the Internet, data communication, 3G (Third Generation) Moblie (3G) technology has become the emphasis and the focus of research in the industry.The 3G system has spectral efficient, the whole world popularizes and seamless roam, support multimedia service, be convenient to transition and features such as evolution, high quality-of-service, can better satisfy the demand of the quick growth of data service (as IP operation).The framework of 3G system is to the direction evolution of all-IP and development, and wherein professional carrying, network exchange and calling control such as voice, data, multimedia is all based on the IP agreement.

In the 3G standard system, (UMTS, Universal MobileTelecommunications System) for the user provides abundant business, comprises voice call, Various types of data business as universal mobile telecommunications system.At third generation partner program (3GPP, 3rd GenerationPartnership Project) in the R99 version, provide maximum rate can reach the dedicated channel RAB of 2M, and along with 3GPP R5, the R6 version is released high speed downlink packet and is inserted (HSDPA, high speed downlink packet access) and high speed uplink packet insert (HSUPA, high speed uplink packet access) technology, the up-downgoing speed of data service can reach about 10M especially, can fully satisfy the user radio online, wireless video, the demand of wireless data application such as wireless downloading service, we can say that third generation wireless communication system has been opened brand-new wireless digital epoch.

Packet data domain (PS, Packet switched) RAB (RAB, Radioaccess bearer) business can be divided into four kinds of business by transport-type: session service (Conversational), stream professional (Streaming), interactive service (Inter-active) and background service (Background), the data application service of having relatively high expectations in real time such as respective session and Streaming Media respectively of preceding two kinds of business, then two kinds of business are called best effort (BE again, BestEffort) business, corresponding to delay requirement is lower but the business that accuracy requirement is higher, as web page browsing, FTP download etc., specifically as shown in table 1.

Table 1

Class of service	Traffic performance	For example professional	Time delay and rate requirement
				Session service	There is cross correlation closely between each information unit of Business Stream, the most responsive to time delay	Speech business, VoIP visual telephone	80-D max(ms) ＜2.048(Mb/s)
Stream is professional	There is cross correlation closely between each information unit of Business Stream, responsive to time delay	The video flowing audio stream	250-D max(ms) ＜2.048(Mb/s)
				Interactive service	The request response model, the Payload content needs higher fail safe	Www web page browsing database retrieval	Without limits
Background service	Do not need to finish at the appointed time response, the Payload content needs higher fail safe	E-mail SMS	Without limits

In actual applications, a RAB often will carry multiple application data: the user may carry out operations such as web page browsing, FTP download or transmitting-receiving E-Mail simultaneously after setting up wireless connections, the packet of various application all can send and receive by this RAB.Obviously, because the application feature difference, different business is expected also to be not quite similar to the speed of transfer of data to the requirement difference of service quality (QoS).How to embody the QoS demand that satisfies different application on same RAB and become the problem that each producer pays close attention to.

In the Packet data service QoS of existing realization RAB management method, for different RAB, according to class of service and core net (CN, Core Network) the distribution preempting priority of specify message is determined the priority of RAB, and when data dispatch the higher RAB packet of priority treatment priority.In a RAB, no longer distinguish the character of packet, and unified be mapped to transmission channel (as, the Mac-d flow channel under dedicated channel DCH or the HSDPA) by a logic channel and send.

Usually, the user carries out the operation of multiple application on a RAB, various application are had nothing in common with each other for the rate requirement of transfer of data, download and web page browsing as carrying out FTP simultaneously, the user wishes that obviously the webpage of asking is responded fast, and to the not special concern that whether slightly descends of FTP downloading rate.

In such scheme, a RAB packet is without any distinguishing the measure that class of data traffic is according to priority handled, all application datas are dispatched according to arriving first the principle of sending out earlier fully, the application data bag One's name is legion that the time ductility that sends if desired requires is lower (download as FTP etc.), will cause other time ductility to have relatively high expectations application data bag the blocking up to a certain degree of (as web page browsing etc.), this does not obviously meet the design requirement that the 3G system demonstrates fully miscellaneous service QoS characteristic, can't satisfy the performance requirement of user's practical operation yet.

Summary of the invention

In view of this, the technical problem to be solved in the present invention provides a kind of QoS management method of wireless access loaded packet data service, with the performance requirement according to various application, improves wireless packet data service service quality.

For addressing the above problem, the present invention adopts following technical scheme:

QoS management method according to a kind of wireless access loaded packet data service provided by the invention comprises:

Differentiate the affiliated applied business classification of packet of RAB;

Determine the transmission priority of described packet according to the applied business classification;

The channel that the packet that priority is high is mapped to high priority transmits.

Ground preferably preestablishes the priority value of types of applications business according to the characteristic of applied business, by inquiring about the transmission priority that this priority preset value is determined described packet.

According to the transmission priority of the delay character specified data bag of applied business, the applied business that delay requirement is high, the transmission priority height of its packet.

As preferably, according to the delay character dynamic-configuration priority of applied business.

Determine the applied business classification that each packet is relevant according to the classification in IP, TCP/UDP in the RAB packet and application layer protocol packet header.

For sending the identical packet of priority, to determine to send priority according to the data traffic of packet destination address, described data traffic is more little, and the transmission priority of corresponding data bag is high more.

Ground preferably, preestablish a data transmission rate value, when the transmission rate of user terminal requests during greater than this scheduled transmission rate value, it is mapped to high speed shared channels, when the transmission rate of user terminal requests during, it is mapped to dedicated channel or forward access channel less than this scheduled transmission rate value.

When described packet is carried on the high speed shared channels, the logic channel of different priorities is mapped in the formation of different dispatching priorities in the data flow of respective protocol entity, according to the order of transmission of the priority attribute decision corresponding data bag of formation.

When described packet is carried on dedicated channel or the forward access channel, during transmission according to the order of transmission of the dispatching priority determination data bag of logic channel.

Based on the wireless transmission channel condition be transferred to each user's data flow, adopt packet scheduling algorithm to transmit packet data package.

In sum, method provided by the invention is by the applied business classification under the packet data package of identification RAB; Determine the transmission priority of described packet according to the characteristic of applied business; Logic channel or transmission channel that the packet that priority is high is mapped to high priority transmit.When the delay requirement performance rate of applied business is identical, then distinguish priority according to the data traffic of destination address, the packet that data traffic is little is mapped on the logic channel of higher priority, the application data bag that ductility is had relatively high expectations when guaranteeing sends fast, satisfy the performance requirement of user for the different application operation, further improve running efficiency of system, thereby satisfy service quality (QoS) requirement of different application business in the Packet Service RAB.

Description of drawings

Fig. 1 is the configuration diagram of WCDMA system;

Figure 2 shows that the Protocol REference Model schematic diagram of Uu interface;

Fig. 3 is a method flow diagram according to a particular embodiment of the invention.

Embodiment

Core concept of the present invention is the class of service by the packet that sends among the identification RAB, and according to this professional delay requirement, according to corresponding priority is this business data packet assignment logic channel, the packet of high priority can guarantee the promptness that data send by logic channel or the transmission channel that is mapped to higher priority, and the application data bag that ductility is had relatively high expectations when guaranteeing sends fast.When the delay requirement performance rate of business is identical, then distinguish priority according to the data traffic of destination address, the packet that data traffic is little is mapped on the logic channel of higher priority, thereby realizes the service quality QoS management of different application business in the Packet Service RAB.

The structure of WCDMA system as shown in Figure 1.Whole WCDMA system is made up of 3 parts, i.e. core network subsystem (CN), radio network controller (RNC), base station node B and subscriber equipment (UE).Core net handles that audio call in the WCDMA system is connected with data and the exchange and the route of external network.RNS RNC links to each other with core net by the Iu interface, and Node B links to each other with RNC by Iub interface.UE is undertaken alternately by the Uu interface (wave point) and the network equipment, and the miscellaneous service function for the user provides circuit domain and packet domain comprises normal speech, mobile multimedia, Internet application etc.

The Protocol REference Model of Uu interface as shown in Figure 2, the Uu interface is divided into three protocol layers: physical (L1), data link layer (L2) and network layer (L3).Layer L2 is further divided into following sublayer: medium insert (MAC), Radio Link control (RLC), packet data convergence protocol (PDCP) and broadcast/multi broadcast control (BMC).The RLC sublayer of layer L3 and layer L2 is divided into control plane and user plane, and PDCP and BMC sublayer exist only in user plane.At control plane, layer L3 is divided into different sublayers, and lowermost layer is Radio Resource control (RRC), is positioned at Access Layer, with layer L2 interface, ends at UTRAN.

Physical layer is the bottom of Uu interface, major function: the multiplexing encoding and decoding demultiplexing of transmission channel, rate-matched, coded combination transmission channel to the modulating/demodulating of the mapping of physical channel, physical channel and spread spectrum/despreading, frequency and time synchronously, closed power control, radio frequency processing etc.

Physical layer provides information transfer service by the SAP with the MAC interlayer to the MAC layer;

The MAC layer utilizes data delivery that physical layer provides to provide business such as the redistributing of data passes, Radio Resource and MAC parameter, measurement report to high level.The MAC layer by and rlc layer between SAP provide logic channel to rlc layer.Logic channel is divided into two classes: control channel and Traffic Channel.

Control channel is used for transmitting control plane information, comprise Broadcast Control Channel (BCCH, Broadcasting Control Channel), Paging Control Channel (PCCH, Paging ControlChannel), Dedicated Control Channel (DCCH, Dedicated Control CHannel), Common Control Channel (CCCH, Common Control CUannel), SHCCH Shared Channel Control Channel logic channels such as (SHCCH, Shared Channel Control Channel).

Traffic Channel is used for transmitting user plane information, comprises Dedicated Traffic Channel (DTCH, Dedicated Traffic Channel), CTCH Common Traffic Channel (CTCH, Common TrafficChannel).

MAC layer major function: logic channel is mapped to suitable transmission channel, selects suitable transformat, selects between different transformat combination, different UEs to be undertaken by dynamic dispatching the identification, traffic supervision, transmission channel kinds switching, encryption etc. of UE on processed, the Common transport channel according to the priority of same UE different data streams for each transmission channel according to the momentary rate of information source.

Rlc layer provides business such as RRC establishment of connection/release, transparent mode data passes, unacknowledged mode data transmission, acknowledged mode data transmission, QoS setting to high level.The major function that rlc layer is finished has: the transmission of Segmentation and Reassembly, user data, send high level data, flow control etc. according to the order of sequence.

Rrc layer is the minimum protocol sublayers of Uu interface layer L3.RRC handles the control plane signaling of UE and UTRAN interbed L3, RRC finishes major function: RRC establishment of connection, reconstruction, maintenance and release between UE and UTRAN, the foundation of User Plane Radio Bearers, reprovision and release, the assignment of the Radio Resource that RRC connects, reshuffle and discharge, RRC connects mobility functions, for high-rise PDU routing by, control required QoS etc.

RRC provides signaling to connect to support the mutual of upper layer information stream to the upper strata.The signaling connection is the affirmation mode link between UE and core net, is used for transmitting upper layer information.

For the ease of understanding the present invention, the operation principle to the RAB RAB in packet switching PS territory describes below.

For packet switching PS (Packet switched) data service, Iu interface user plane (IuUP, Iu User-Plane) adopts transparent mode.The downlink grouped swap data is (as PPP, IPV4, the IPV6 message) by after the GTPU encapsulation, send to RNC by GSN, data convergence protocol PDCP (Packet Data Convergence Protocol) is present in user plane, the protocol Data Unit PDU (Protocol Data Unit) that be responsible for to handle Packet Service (if disposed a compression function, finishing the head compression of grouped data) and form PDCP is submitted to wireless connection control (RLC, Radio Link Control) entity and sends.

Because the RAB RAB in packet switching (PS) territory can only corresponding PDCP entity, therefore can carry out packet header in PDCP to all packets that are carried on this RAB resolves, determine the practical application class of service that each packet is relevant according to the classification in IP, TCP/UDP in the packet and subsequent applications layer protocol packet header, and according to affiliated applied business to the time ductility height that requires with its logic channel that is mapped to different dispatching priorities, embody the QoS characteristic of different application in the same RAB.

Need the corresponding delay requirement grade of various applied business category settings among the present invention to RAB.

Have multiplely owing to be based upon applied business on the RAB, and will constantly expand from now on.Therefore, can carry out the dynamic-configuration of relative time delay grade at current typical applied business: be configured to high-grade relatively as time ductility grade with application such as video request program, Streaming Medias; The time ductility grade of application such as web page browsing, instant messaging ranges medium range; And FTP downloads, and the time delay grade of application such as transmitting-receiving EMAIL is configured to relative inferior grade.

By dynamic-configuration, not only can be easily to newly-increased application settings grade in relative time delay, and can dispose relativeness flexibly, to satisfy client's demand according to the residing different scenes of system.

For making principle of the present invention, characteristic and advantage clearer, the present invention is described in further detail below in conjunction with specific embodiment.

In packet switching PS business, no matter the process of transmitting of grouped data is descending or up in the RAB RAB, send data via related protocol entity PDCP-〉RLC-〉MAC-d etc. handles successively, transmits, therefore, on the QoS method of descending, up realization different application packet is consistent, is the transmission flow of example explanation grouped data below with the downlink data.

Fig. 3 is the method flow diagram according to the Packet data service QoS management of realization RAB provided by the invention, with reference to Fig. 3.

Transmission priority for the ease of the specified data bag, the present invention preestablishes the priority value of types of applications business according to the characteristic (as the delay requirement characteristic) of applied business, as determining priority by the time delay requirement, the delay requirement of applied business is high more, and its priority is high more.By inquiring about the transmission priority that this priority preset value is determined described packet.

Step S01: the data of packet switching PS business are encapsulated according to general packet radio service gprs (General Packet Radio Service), send to RNC afterwards; Because Iu interface user plane IuUP is a transparent mode, therefore, the GPRS packet directly sends to the PDCP entity of RAB correspondence;

Step S02:PDCP entity is resolved the agreement packet header of downlink grouped data, the protocol layer of resolving comprises network layer protocol (as the IP bag), transport layer protocol (as TCP bag, UDP bag) and follow-up application layer protocol etc., determines which class is this packet data package belong to and specifically use.

Usually, packet switching service carrying mostly be IP (network layer) packet greatly, such as IP+TCP (transport layer) bag is arranged, IP+UDP (transport layer) and IP+ICMP and IP+IGMP or the like, wherein IP+TCP and IP+UDP are more commonly used, the application that is carried on the IP+UDP allows the low volume data packet loss, but the transmission rate height is used for real-time video broadcast etc. such as IP+UDP+RTP (multimedia transmission agreement).Be carried on application on the IP+TCP to data accuracy requirement height, download IP+TCP+FTP or the like as HTTP web page browsing IP+TCP+HTTP, FTP.These packet header that specifically are applied in application layer generally just comprise " HTTP " multimedia transmission agreement RFT such as HTTP and also comprise the specific frame head of Real-time Transport Protocol all by its customizing messages, so the data packet head of each application is all by its application protocol definition.Such as: what the web stream media application was used is the RTP application protocol, and whether its IP header structure is IP+UDP+RTP, according to the definition of these three kinds of headers, can the specified data bag be RTP applied business packet just.The File Transfer Protocol of down load application, whether its IP header structure is IP+TCP+FTP, according to the definition of these three kinds of headers, can the specified data bag be FTP applied business packet just.Whether the net industry is browsed the general http protocol of using, and its IP header structure is IP+TCP+HTTP so, according to the definition of these three kinds of headers, can the specified data bag be that HTTP uses just.And TELNET IP+TCP+TELNET or the like of telnet use.

The packet that can't classify belongs to " other application " classification.

Step S03: the delay requirement grade corresponding priorities of this PS applied business that inquiry sets, if delay requirement is higher, promptly the priority height then is mapped to this packet in the logic channel of higher priority; Otherwise the application for delay requirement lower (being that priority is lower) then is mapped to the lower priority logic channel with its packet.

Transmission channel comprises high speed shared channels (HS-DSCH in the RAB, High SpeedShared Channel), dedicated channel (DCH, Dedicated Channel) or forward access channel (FACH, Forward Link Access Channel), these transmission channels can receive the data of a plurality of logic channels simultaneously, dispatch when transmitting data according to the priority of each logic channel then.

Be mapped to a transmission channel as a plurality of logic channels, when in transmission channel, carrying out transfer of data so, will dispatch according to the priority of logic channel.If the priority height of logic channel then preferentially transmits the data of this logic channel.Among the present invention during according to the application under the packet ductility require height and data volume to come the specified data bag to be mapped to the logic channel of which priority, disposed the applied business of 3 kinds of priority such as the backstage, be respectively applied business I (as, VOIP voice, real-time video traffic): the priority height; Applied business II (as, www web page browsing, database retrieval): in the priority; Applied business III (as, FTP downloads or transmitting-receiving E-Mail): priority is low.Suppose the logic channel of 15 priority of transmission channel support, the packet of using I so just is mapped to high priority logic channel CH1-CH5; The packet of using II just is mapped to time high priority logic channel CH6-CH10; The packet of using III just is mapped to lower priority logic channel CH11-CH15.

If the delay requirement grade of affiliated application is identical, then calculate the data traffic of different IP destination address, determine priority according to the data traffic of destination address, the packet that data traffic is little is mapped on the logic channel of higher priority.For example, the packet among the above-mentioned logic channel CH1-CH5 can decide by the IP destination address, and the IP destination address corresponding data flow amount of packet is more little, and this priority of data packets is high more, the preferential transmission, on the contrary low more.

Step S04: whether the transmission channel of judging this PS business is high speed downlink shared channel HS-DSCH.If HS-DSCH, execution in step S05 then, otherwise, execution in step S06.

Step S05: if the professional downlink bearing of PS is on HS-DSCH, then the logic channel of different priorities is mapped in the formation (Queue) of different dispatching priorities of data flow of protocol entity MAC-d, by the order of transmission of Node B according to the priority attribute decision corresponding data bag of formation (Queue).

Step S06: if the PS service bearer on dedicated channel (DCH) or forward access channel (FACH), then transmission channel is according to the order of transmission of the dispatching priority determination data bag of logic channel, guarantees that the high data of priority are in time sent.

In addition, for guaranteeing the quality of service requirement (QoS) of different business stream,, adopt the packet scheduling algorithm support to transmit grouped data fast based on wireless transmission channel condition and the data traffic that is transferred to different user.Packet scheduling algorithm such as self adaptation equitable proportion (APF, Adaptive ProportionalFair) algorithm adopts this algorithm, and the user has higher priority when experiencing more multichannel variation, thereby obtains higher data speed; Improved weight limit preferential M-LWDF (the ModifiedLargest Weighted Delay First) algorithm of delaying time, the main thought of this algorithm is the time delay of packet data package and how effectively utilizes the channel information balance to consider, the calculating of its User Priority is not only relevant with the current channel quality of user, and is also relevant with the formation time delay of bag.

In addition, preestablish a data transmission rate value, after the transmission priority of determining the PS packet, transmission rate according to user's request, packet is mapped to corresponding transmission channel,, it is mapped to high speed shared channels (HS-DSCH) when the transmission rate of user terminal requests during greater than predetermined transmission rate value, when the transmission rate of user terminal requests during, it is mapped to dedicated channel (DCH) or forward access channel (FACH) less than predetermined transmission rate value.

High speed shared channels (HS-DSCH), dedicated channel (DCH) or forward access channel (FACH) can receive the data of a plurality of logic channels simultaneously, dispatch when transmitting data according to the priority of each logic channel then.

The foregoing description is used for description and interpretation principle of the present invention.Be appreciated that the specific embodiment of the present invention is not limited thereto.To those skilled in the art, various changes of carrying out under the prerequisite that does not break away from the spirit and scope of the invention and modification all fall within protection scope of the present invention.Therefore, protection scope of the present invention is determined by claim.

Claims (10)

1, a kind of QoS management method of wireless access loaded packet data service is characterized in that, comprising:

Differentiate the affiliated applied business classification of packet of RAB;

Determine the transmission priority of described packet according to the applied business classification;

The channel that the packet that priority is high is mapped to high priority transmits.

2, Packet data service QoS management method as claimed in claim 1 is characterized in that, this method further comprises:

Preestablish the priority value of types of applications business according to the characteristic of applied business, by inquiring about the transmission priority that this priority preset value is determined described packet.

3, Packet data service QoS management method as claimed in claim 2 is characterized in that, this method also comprises:

According to the transmission priority of the delay character specified data bag of applied business, the applied business that delay requirement is high, the transmission priority height of its packet.

4, Packet data service QoS management method as claimed in claim 3 is characterized in that, according to the delay character dynamic-configuration priority of applied business.

5, Packet data service QoS management method as claimed in claim 2 is characterized in that, determines the applied business classification that each packet is relevant according to the classification in IP, TCP/UDP in the RAB packet and application layer protocol packet header.

6, Packet data service QoS management method as claimed in claim 1 or 2, it is characterized in that,, determine to send priority according to packet destination address corresponding data flow amount for sending the identical packet of priority, described data traffic is more little, and the transmission priority of corresponding data bag is high more.

7, Packet data service QoS management method as claimed in claim 1, it is characterized in that, this method also comprises: preestablish a data transmission rate value, when the transmission rate of user terminal requests during greater than this scheduled transmission rate value, it is mapped to high speed shared channels, when the transmission rate of user terminal requests during, it is mapped to dedicated channel or forward access channel less than this scheduled transmission rate value.

8, Packet data service QoS management method as claimed in claim 7, it is characterized in that, when described packet is carried on the high speed shared channels, the logic channel of different priorities is mapped in the formation of different dispatching priorities in the data flow of respective protocol entity, according to the order of transmission of the priority attribute decision corresponding data bag of formation.

9, Packet data service QoS management method as claimed in claim 7 is characterized in that, when described packet is carried on dedicated channel or the forward access channel, during transmission according to the order of transmission of the dispatching priority determination data bag of logic channel.

10, Packet data service QoS management method as claimed in claim 8 is characterized in that, this method further comprises:

Based on the wireless transmission channel condition be transferred to each user's data flow, adopt packet scheduling algorithm to transmit packet data package.

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