CN1647468A

CN1647468A - Method and system for compressing and transmitting multimedia data

Info

Publication number: CN1647468A
Application number: CNA038087235A
Authority: CN
Inventors: 李所暎; 李承俊; 李英大
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2002-08-14
Filing date: 2003-08-13
Publication date: 2005-07-27
Anticipated expiration: 2023-08-13
Also published as: EP1532777A4; AU2003252556A1; WO2004017577A1; KR20040016063A; KR100889864B1; EP1532777A1; CN1647468B

Abstract

In a system in which multimedia data is compressed and broadcast or multicast to downlink, UTRAN is quickly transited to a full context formation state or a dynamic context formation state if plural terminals fail to form a full context or a dynamic context. Accordingly, the plural terminals can normally receive a header-compressed MBMS data in a U-mode of an ROHC technique.

Description

The method and system of compression and transmitting multimedia data

Technical field

The present invention relates to the data compression in mobile radio system and the method for transmission, relate in particular to about being used in UMTS (universal mobile telecommunications system) and compress method and system with transmitting multimedia data.

Technical background

Because the significant development of wireless mobile communications, mobile phone is used more widely than telephone.Yet, just mobile phone being provided than with regard to the bigger quantity data communication service of common Speech Communication by radio access network, wireless mobile communications is after the performance of existing cable communication system.

Allow the communication system of mass data to be called as IMT-2000, its technological development is encouraged in a lot of countries and its standardization is just being begun international cooperation.

Universal mobile telecommunications system (UMTS) is a 3-G (Generation Three mobile communication system), and it is from being called " global system for mobile communications (GSM) standard evolution.This standard is an European standard, and target is based on the GSM core network and Wideband Code Division Multiple Access (W-CDMA) technology provides improved mobile communication service.

In December, 1988, it is to set up to make the standardized standard of UMTS that the TTA of the ARIB/TTC of the ETSI in Europe, Japan, the TI of the U.S. and Korea S has set up " third generation cooperative programme (3GPP) " purpose.

The work of the standardization UMTS that is finished by 3GPP has caused having made up five technical specification group (TSG), and wherein each group has the network element of independent operation at structure.

More particularly, each TSG develops, ratifies and manage the standard criterion of a relevant range.Wherein, the standard of the interface of radio frequency accesses network (RAN) group (TSG-RAN) development function, required term and UMTS land radio frequency accesses network (UTRAN), and UTRN is a new RAN who is used for supporting at UTMS the W-CDMA access technique.

Fig. 1 represents the network configuration of a general UMTS.

As shown in Figure 1, UMTS is divided into terminal, UTRAN and core network roughly.

This UTRAN comprises one or more radio frequency network subsystems (RNS).Each RNS comprises a RNC and one or more Node B s by the RNCs management.

This RNC handles the distribution and the management of radio frequency resource, and as the accessing points for core network.Node B s receives the information that the physical layer by terminal (for example mobile radio station, subscriber equipment and/or user's set) sends by up link, and by down link data is sent to terminal.Node B s operates the accessing points of terminal as UTRAN like this.

Core network comprises: be used for support circuit-switched serving mobile switching center (MSC), GMSC (gateway mobile switching center) (GMSC), be used to support the Serving GPRS Support Node (SGSN) and the Gateway GPRS Support Node (GGSN) of packet-switched services.

The service that particular terminal is provided is divided into circuit switched service and packet-switched services haply.For example, universal phonetic call service belongs to circuit switched service, and serves classified in packet-switched services by the Web browsing that the internet connects.

Under the situation of support circuit-switched service, RNC is connected to the MSC of core network, and this MSC is connected to the GMSC (GMSC (gateway mobile switching center)) of management to the connection of other network.

Simultaneously, under the situation of packet-switched services, service is provided by the SGSN (Serving GPRS Support Node) and a GGSN (Gateway GPRS Support Node) of core network.

This SGSN supports to move towards the packet communication of RNC, and this GGSN management is to the connection of other packet switching network (for example internet).

The interface that exists between the diverse network parts allows network components to send and obtain information each other in order to intercom mutually.Cable interface between RNC and the core network is defined as the Iu interface.

Iu interface and being connected of packet switching zone are defined as Iu-PS, Iu interface and being connected of circuit switching zone are defined as Iu-CS.

Radio frequency access interface between terminal and the UTRAN is defined as the Uu interface.

Fig. 2 represents the structure of radio frequency access interface agreement between terminal and UTRAN based on 3GPP radio frequency accesses network standard.

This radio frequency access interface agreement constitutes, can be divided in the horizontal direction the user's face of data information and the chain of command of transmission control signal in vertical direction by physical layer, data link layer and network layer.

User's face is the scope that is transmitted user's business information (as voice or IP grouping) to it.Chain of command is the scope to its communicating control information (as the interface of network or the maintenance and management of a calling).

In Fig. 2, protocol layer can be based on low three layers of well-known OSI(Open Systems Interconnection) master pattern in communication system, and are divided into ground floor (L1), the second layer (L2) and the 3rd layer (L3).

Ground floor L1 is a physical layer, provides information transfer service to the second layer (upper strata) by using various radio frequency tranmission techniques.

This physical layer is connected to the MAC layer on upper strata by transmission channel, and data are transmitted between PHY layer and MAC layer by transmission channel.

The L2 layer comprises media interviews controls (MAC) layer, radio frequency link control (RLC) layer and packet data convergence protocol (PDCP) layer.

The MAC layer is provided for the service of the MAC parameter reallocation of the distribution of radio frequency resource or reallocation, and is connected to radio frequency link control (RLC) layer by a logic channel.

Various logical channels provides according to the kind of transmission information.Usually, when the information of chain of command is transmitted, use control channel, and when the information of user's face is transmitted, use Traffic Channel.

The reliable transfer of data of LRC layer support splits a RLC service data unit (SDC) that receives from the upper strata and reorganization with playing a part.

The size of this RLC SDU that receives from the upper strata is controlled to adapt to the ability of being handled by rlc layer, and stem joins RLC SDU and is transferred to the MAC layer with the form of protocol Data Unit (PDU).The RLC buffer that RLC SDUs that storage receives from the upper strata or RLC PDUs use is present among this rlc layer.

It is the last layer of rlc layer that grouped data is assembled control (PDCP) layer.By procotol, (for example IPv4 (internet protocol version four) or IPv6 (IPv 6), the data of transmission can be transmitted on radio frequency interface effectively by means of the PDCP layer.

For this purpose, this PDCP layer plays a part minimizing and is used for the unnecessary control information of cable system, and it is called as header compressed.

As header compressed, the header compressed technology (robust header compression (ROHC)) that is called RFC2507 or RFC3095 is defined by the Internet Standard group that is called IETF (internet engineering task team).

With this header compressed technology, only the requisite information of stem part is transmitted, thereby less control information is transmitted, and makes the data volume that is transmitted reduce like this.

Be positioned at the 3rd layer lowermost portion rrc layer only the control aspect be defined and control transfer channel and physical channel foundation, reconfigure and the release of RF carrier (RBs).

Broadcast/group broadcast control (BMC) arrangement layer is sent to specific sub-district from Cell Broadcast CB (CB) message of core network reception and it, thereby each terminal that is positioned at the sub-district can receive this cell broadcast messages.The BMC layer is used for handling broadcast capability, and DB message is short message, and it only is made up of character and numeral and is included in 1230 eight hytes of maximum between the terminal or between terminal and system.

At UTRAN on one side, information, for example message id, sequence number or encoding scheme are added to from last layer and receive the CB message, and are transferred to rlc layer with the BMC message format.This BMC message is transferred to the MAC layer by the logic channel of CTCH (" CTCH Common Traffic Channel "), and this moment, the CTCH logic channel shines upon with FACH (" access channel forward ") transmission channel, and this FACH transmission channel shines upon with SCCPCH (" Secondary Common Control Physical Channel ").

Rrc layer is positioned at the lowermost portion of the 3rd layer (L3).This rrc layer only defines in the control aspect, and the foundation of control logic channel, transmission channel and physical channel, reconfigures and the release of RBs.This RB represent the service of transfer of data between terminal and UTRAN that provides by the second layer, the foundation of RB mean for needed protocol layer of special services and channel regulation feature are provided and set separately detail parameters and the process of method of operation.

As reference, rlc layer can be included among user's face and the chain of command according to the layer that is connected to the upper strata.When rlc layer belongs to chain of command, accept data from radio frequency resource control (RRC) layer.In other situation, rlc layer belongs to user's face.

As shown in Figure 2, under rlc layer and PDCP layer situation, a plurality of entities can be present among the layer.Usually this is because a terminal has a plurality of RBs, and has only a RLC entity and have only a PDCP entity to be used to a RB.

To describe the PDCP layer now utilizes header compressed ROHC (robust header compression) technology to carry out header compressed.

The ROHC technology is used to reduce the header information of RTP (RTP)/DUP (User Datagram Protoco (UDP))/IP (IP(Internet Protocol)) grouping usually.

The grouping that the RTP/UDP/IP grouping refers to have relevant stem, these stems are to add after this RTP, UDP and IP are passed through in the grouping that the last layer transmission comes.This grouping comprises for data can be transmitted via Internet to destination and being recovered and required different and a lot of header messages.

The ROHC technology is based on a kind of fact, and each field value of packet header that promptly belongs to the grouping that links up of a stream of packets is almost fixed.This ROHC technology does not transmit the whole group header field and just transmits vicissitudinous field like this.

As a reference, the whole header size of non-compressed rtp/UDP/IP grouping is 40 eight hytes under IPv4 (IP version 4) situation, and be 60 eight hytes under the IPv6 situation, and usually, the clear data field of pay(useful) load has the size of 15-20 eight hytes.

Like this, for non-compressed rtp/UDP/IP grouping, the control information that is included in the data has also more much bigger than the actual data that will be transmitted.This efficient that just means its transmission is very low.

Therefore, header compressed technology can reduce the quantity of control information significantly and have the size of about 1 eight hytes to 3, eight hyte with the stem of ROHC technique compresses usually.

This ROHC technology is divided into unidirectional mode (hereinafter referred to as ' U-pattern ') haply, bidirectional optimistic mode (hereinafter referred to as ' O-pattern '), and bidirectional reliable mode (hereinafter referred to as ' R-pattern ').

In the U-pattern, from the transmitter side to the receiver side, carry out one-way communication.

Simultaneously, in O-pattern and R-pattern, transmitter side transmits grouping on real-time basis, and receiver side transmits transmitting state information to transmitter side.Therefore, ROHC also controls reverse real-time circulation transmission packets in O-pattern and R-pattern, and this is in the header compressed grouping of transmission, also receives ROHC state information (ACK or NACK) from receiver side.

The application target that transmits the ROHC state information from the receiver side to the transmitter side can be according to the pattern of ROHC technology and difference.

Receiver side increases compression efficiency by main transmission and NACK relevant information in the O-pattern.And in the R-pattern, receiver side uses the accurate logic utilize the ROHC state information to support the header compressed of robust more.

The U-pattern of ROHC technology will go through following.

Condensing routine has complete context and makes up three kinds of states that state, dynamic context make up state and complete context completion status.The dissimilar compressed header grouping of transmission in every kind of state, and method of operation is also different in every kind of state.

As shown in Figure 3, complete context structure state refers to should to set up because there not being complete context the state that complete context or complete context have been destroyed fully and should rebuild its.

So dynamic context structure state is meant the destroyed state that should rebuild its of the dynamic context part of complete context.The complete context completion status is meant that complete context is done and not ruined state.

Each state overtime on each cycle (timeout) with transfer to different states, and each cycle is different.The change-over period that for example makes up state from the complete context completion status to complete context is also bigger than the change-over period that makes up state from the complete context completion status to dynamic context.

Multi-medium broadcast/group broadcast service (MBMS) will be described now.

MBMS is proposed existing sub-district (Cell) broadcast service (CBS) that is provided by the BMC layer is provided, and it fails to provide multicast functionality, and the size of propagable short message is restricted to maximum 1230 eight hytes.

As shown in Figure 4, MBMS is used for by using unidirectional point-to-multipoint carrying service transmitting multimedia data such as audio frequency, video or pictorial data to the service of a plurality of terminals.This MBMS supports broadcast mode and multicast pattern.That is, this MBMS supports MBMS broadcast service and MBMS multicast services.

This MBMS broadcast mode is used for to the service at each user's transmitting multimedia data of broadcast area.One or more broadcast areas may reside among the PLMN, can provide one or more broadcast service in a broadcast area, and a broadcast service can offer several broadcast areas.Broadcast area is meant effectively zone of broadcast service.

The MBMS multicast pattern is the service that only is used for the particular group of users transmitting multimedia data of multicast area.One or more multicast area can be present among the PLMN, can provide one or more multicast services in a multicast area, and a kind of multicast services can offer several multicast area.This multicast area is meant effectively zone of multicast services.

When MBMS transmission during as the multi-medium data of broadcasting or multicast, the volume of grouping is often quite big, has therefore occupied the very most stem of grouping and has partly adopted header compressed technology to compress to improve the efficient of transfer of data.Utilize ROHC as the header compressed technology that is used for the MBMS service this moment.

Yet, the MBMS of unidirectional point-to-multipoint service can not receive the ROHC state information and only the U-pattern in three kinds of states of ROHC can be applied.

As shown in Figure 5, whether the recipient of tube terminal, MBMS has not successfully received the full header grouping and has normally made up complete context, perhaps whether dynamic context is damaged, and this receiver side all divides into groups to one of transmitter side UTRAN transmission accordingly at each state of three states.

In other words, in MBMS,, adopt the ROHC technology that the stem of multi-medium data partly is compressed into 1-2 eight hytes, and in this regard, only the U-pattern of ROHC technology can be used owing to the feature of its one directional service in order to improve data transmission efficiency.Yet in fact the U-pattern is a method header compressed in the point-to-point link, thereby in statu quo can cause problem when the U-pattern is applied to point-to-multipoint link such as MBMS.

The caused by operations problem is as follows in the point-to-multipoint link of U-pattern.

For example, when multi-medium data is header compressed and by broadcasting and multicast when being transferred to several terminals of wanting the service that receives simultaneously, UTRAN sends complete stem grouping or dynamic context to each terminal and makes up grouping, and each divides into groups to make up complete context or dynamic context according to the type of the grouping that is received.At this moment, if each terminal successfully makes up context, it just can successfully recover after this will be transmitted the stem grouping of compression.But, if context makes up failure, the just stem of the compression that can not recover after this to be transmitted grouping.Just, terminal can not receive the MBMS service.

Therefore, in traditional technology, if terminal receives complete stem grouping or dynamic context makes up grouping and can not make up complete context or dynamic context, it just should be waited for until the change-over period, be transformed in this complete context completion status of this cycle that dynamic context makes up state or this complete context completion status is transformed into complete context structure state, just, up to overtime, and with complete context structure state resume operations.Like this, the terminal that makes up the context failure can not receive the MBMS service with the quite long cycle, thereby causes the decline of the validity of service.

As mentioned above, when the MBMS data with point-to-multipoint feature use that the U-pattern of POHC is compressed on point-to-point link, traditional technology has such problem, if a plurality of terminals are failed when making up complete context, the compressed MBMS data of this stem can not be received, unless UTRAN (this transmitter side) is converted into complete context and makes up state, perhaps under the situation of terminal structure dynamic context failure, convert dynamic context to and make up state.

The list of references of above-mentioned suitable conduct details, characteristics and/or technical background additional or that replace is included in this by reference.

Announcement of the present invention

Therefore, target of the present invention provides the system and method for a kind of compression and transmitting multimedia data, in the time of wherein can not making up complete context as if a plurality of terminals, UTRAN (this transmitter side) will be transformed into complete context fast and make up state, and when if a plurality of terminals can not make up dynamic context, UTRAN will convert dynamic context fast to and make up state, normally receive header compressed MBMS data by the U-pattern of ROHC technology to allow a plurality of terminals, thereby improve efficiency of transmission.

For all or at least in part realizing above-mentioned target, compression of multi-medium data and transmission system are provided, described system comprises: UTRAN, the type that is used for based on context making up state uses the U-pattern of ROHC technology to compress the MBMS data and transmit it; Make up corresponding contextual terminal with the grouping that is used for from receiving, and the corresponding context damage information of transmission arrives UTRAN (this transmitter side) under structure context failure scenarios.

The complete context that UTRAN accumulative total receives from terminal by rrc layer is damaged the quantity that information and dynamic context damage information, and by the quantity of rrc layer or the header compressed processing layer context damage information by relatively judging each accumulative total whether more than or equal to the threshold value that presets.

If the quantity of each context infringement information is more than or equal to the threshold value that presets, this rrc layer or header compressed processing layer will be transformed into former respective contexts fast and make up state.

If terminal can not make up context, the rrc layer of terminal arrives the rrc layer of UTRAN as the context damage message transmission of the respective type of RRC message according to the type handle.

For all or at least in part realizing these advantages, the method that a multi-medium data compression further is provided and has transmitted, described method comprises: if receiver side can not make up context, then add up the quantity of context damage information; And whether the quantity of context damage information of measuring accumulative total more than or equal to threshold value, and if the quantity of the context damage information of accumulative total during more than or equal to this threshold value, the corresponding context before being transformed into apace makes up state.

Therefore, under the situation that the U-pattern of using the ROHC technology is compressed MBMS and transmit, if the terminal of receiver side can not make up complete context with the full header grouping, just complete context is damaged, this terminal is damaged message transmission to complete context to transmitter side UTRAN, if and damage the quantity of information greater than the threshold value that presets from the complete context that receiver side receives, UTRAN allows the condensing routine of header compressed processing layer to be transformed into complete context and makes up state, divide into groups to transmit this full header, thereby this complete context can be made up apace and terminal can receive the MBMS service.

Simultaneously, if terminal can not make up dynamic context with the dynamic context information block, just dynamic context is damaged, this terminal arrives transmitter side UTRAN to dynamic context infringement message transmission, if and the dynamic context that receives from receiver side damages the quantity of information greater than the threshold value that presets, UTRAN allows condensing routine to be transformed into dynamic context and makes up state, make up grouping with the transmission dynamic context, thereby this dynamic context can make up apace and this terminal can receive the MBMS service.

Additional advantage of the present invention, target and characteristics will partly propose in the following description, and partly partly will learn perhaps from the practice of the present invention to become apparent in following by studying for those of ordinary skill in the art.Target of the present invention and advantage can be understood and reach by quilt as point out especially at additional claims.

The brief description of illustration

The present invention describes in detail with reference to the following drawings, and wherein same label refers to same element, wherein:

Fig. 1 represents the structure of a general UMTS system;

Fig. 2 represents the structure according to the terminal of 3GPP radio frequency network standard and the radio frequency access interface agreement between the UTRAN;

Fig. 3 represents the state and the transmission course of a general ROHC U-mode compression program;

Fig. 4 represents the exemplary diagram of the point of general MBMS to the multiple spot feature;

Fig. 5 is the flow chart according to the U-pattern operation of the ROHC of conventional art;

Fig. 6 be expression according to preferred embodiment of the present invention, utilize the ROHC technology to be used to compress block diagram with the system of MBMS transmission data; With

Fig. 7 is according to preferred embodiment of the present invention, utilizes the flow chart of the method for ROHC technique compresses and MBMS transmission data.

Carry out the mode of preferred embodiment

Below will at length be described preferred embodiment of the present invention, its example will illustrate in conjunction with legend.

Fig. 6 is a block diagram, and the ROHC technology of expression employing preferred embodiment of the present invention is compressed the system with the MBMS transmission data.

As shown in Figure 6, adopt the system of ROHC technique compresses and transmission data to comprise: UTRAN620, the type that is used for based on context making up state adopts the U-mode compression MBMS data of ROHC technology and transmits it; With terminal 610, be used for making up corresponding context, and can not making up following corresponding context damage message transmission of contextual situation to transmitter side UTRAN620 from receiving grouping.

UTRAN620 receives this complete context damage information that receives by rrc layer 621 from terminal 610, and totally each quantity, and this rrc layer 621 or header compressed processing layer 622 judge that whether the quantity of the context damage information that each adds up is more than or equal to preset threshold value.

If the quantity of context damage information is more than or equal to preset threshold value, header compressed processing layer 622 makes state transfer to previous corresponding context apace and makes up state.Can there be rrc layer 621 in this threshold value or in the header compressed processing layer of UTRAN.

Now operation of the present invention and effect will be described.

In preferred embodiment of the present invention, the U-pattern of ROHC technology, the header compressed technology that is used for the UTRAN of MBMS service is not only transmitted and is used to make up contextual grouping, and receive whether successfully to have made up contextual information about it from terminal (at receiver side), be used for maintenance and management so that context make up can be succeeing in terminal greater than certain speed, thereby improve the efficient of transmission.

As shown in Figure 6, if the packet corruption context that receives from the header compressed processing layer 622 of UTRAN620, the header compressed processing layer 612 transmission context damage information of terminal 610 are to rrc layer 611, and rrc layer 611 then, by using rrc layer 611 transmission of messages context damage information.Based on context this rrc layer 621 of UTRAN620 makes up the context damage information that the type accumulative total of state receives from terminal.

After this, the header compressed processing layer 622 of rrc layer 621 or UTRAN620 judges that whether the quantity of context damage information is more than or equal to threshold value.

If the quantity of context damage information is more than or equal to threshold value, header compressed processing layer 622 is transformed into previous complete context and makes up state or dynamic context structure state, is used to make up corresponding contextual grouping with transmission.

With step in brief, the first step, if terminal 610 can not make up context, the quantity of the context damage information that UTRAN620 accumulative total receives from receiver side, second step, whether the quantity that checks the context damage information that adds up is more than or equal to threshold value, and state will be transformed into corresponding context apace and make up state, divides into groups with the stem that conversion has been compressed.

Fig. 7 is a flow chart, and the method for ROHC technique compresses and MBMS transmission data is used in expression according to preferred embodiment of the present invention.

At first, will introduce because complete context is not fabricated or is damaged in the zone that a kind of MBMS service is provided, the operating process of the stem grouping that the UTRAN transmission is complete promptly, makes up the operating process of state with the complete context of UTRAN.

When transmitter side is in complete context structure state (step S701), UTRAN initializing variable (Failure ₁), be used to store the complete context that has damage that receives from terminal terminal quantity (step S702) and the full header grouping is sent to this terminal (step S703).

Next step, whether UTRAN begins to transmit the stem grouping of compression, be grouped in the terminal with this full header with complete context and normally made up have nothing to do (step S704).

If UTRAN receives complete context damage information (step S708 and S709) from terminal, then confirm complete context because this full header grouping in terminal is damaged, increase the terminal quantity of the complete context have damage, and it is stored in (step S710) among this variable.

UTRAN is the terminal quantity and the threshold value (N1 that are stored in the complete context that has damage of accumulative total in the variable _Threshold) (step S711) compares.If the terminal quantity of accumulative total is more than or equal to this threshold value, it turns back to that complete context makes up state and this full header packet transmission is repeated to carry out (step S701～S703).

Yet, if the quantity of terminal of complete context that has damage is less than threshold value, the accumulated quantity of the terminal of the complete context that has damage of storing in variable is kept initial value, and the stem transmission packets process of compression also continues to carry out (step S704).

As mentioned above, in the present invention, if complete context is to be damaged in the receiver side terminal, the rrc layer of this terminal damages information to complete context as the rrc layer (transmitter side) of a RRC transmission of messages to UTRAN.At this moment, UTRAN has the threshold value that is used to the terminal quantity of the complete context of damage.This threshold value can be present in the rrc layer or header compressed processing layer of UTRAN.

If threshold value is present among the rrc layer of UTRAN, rrc layer is the quantity and the threshold of the complete context terminal that has damage of the accumulative total that is transmitted from terminal, if the terminal quantity of accumulative total is greater than threshold value, this RRC makes up state to header compressed state exchange to transmit the full header grouping again to complete context.

Simultaneously, if the territory is present in the header compressed processing layer of UTRAN, the RRC of UTRAN is transferred to header compressed processing layer to the quantity of terminal of the complete context that has damage, makes this header compressed processing layer can be it and threshold.If the terminal quantity of complete context that has damage is greater than threshold value, it makes up state to header compressed state exchange to complete context, to transmit the full header grouping again.

Such as mentioned above, when the quantity that has the terminal of damaging complete context made header compressed state exchange become complete context to make up state more than or equal to threshold value, the accumulative total that has the terminal of damaging complete context was initialized to 0.

Secondly, will introduce now because dynamic context is not built into or damages in the zone that a MBMS service is provided, UTRAN transmits the operating process of dynamic stem grouping,, makes up the operating process of state with the dynamic context of UTRAN that is.

When transmitter side is in the dynamic context structure state (step S705), UTRAN initializing variable (Failure ₁), be used to store the quantity (step S706) of the terminal that has impaired dynamic context and give this terminal (step S707) dynamic stem transmitted in packets.

Next step, whether UTRAN begins to transmit the stem grouping of compression, and be grouped in the terminal by structure normally have nothing to do (step S704) with this dynamic stem with dynamic context.

If UTRAN receives dynamic context from terminal and damages information (step S708 and S709), it confirms dynamic context because the dynamic stem grouping in terminal damages, increase the quantity that has the terminal of damaging dynamic context, and it is stored in (step S712) in this variable.

UTRAN is the accumulated quantity and the threshold value (N1 that are stored in the terminal of the dynamic context that has damage in the variable _Threshold) relatively.If the number of terminals of accumulative total is more than or equal to threshold value (S713), the process that it turns back to dynamic context structure state and dynamic stem transmitted in packets repeats to carry out (step S705-S707).

Yet, if having damage dynamic context number of terminals less than threshold value, the terminal accumulated quantity that is stored in the dynamic context that has damage in the variable keeps initial value, and stem packet transmission that should compression continues to carry out (step S704).

As mentioned above, in the present invention, if dynamic context is damaged in terminal, the rrc layer of terminal damages by this dynamic context of rrc layer of RRC message informing UTRAN.At this moment, UTRAN has the threshold value that is used to the quantity of the terminal of the dynamic context of damage.This threshold value can be present in the rrc layer or header compressed processing layer of UTRAN.

If this threshold value is present in the rrc layer of UTRAN, this rrc layer is the dynamic context terminal quantity and the threshold that have damage of the accumulative total of coming from terminal transmission, if the terminal quantity of accumulative total is greater than threshold value, this RRC just makes up state to header compressed state exchange to dynamic context, to transmit dynamic stem grouping again.

Simultaneously, if this threshold value is present in the header compressed processing layer of UTRAN, the rrc layer of UTRAN is transferred to header compressed processing layer to the terminal quantity that has a dynamic context of damage, makes the header compressed processing layer can be it and threshold.If the terminal quantity of accumulative total of dynamic context that has damage is greater than threshold value, it makes up state to header compressed state exchange to dynamic context, to transmit dynamic stem grouping again.

Such as described, when the terminal quantity of the dynamic context that has damage made header compressed state exchange become dynamic context to make up state more than or equal to threshold value, the accumulative total terminal quantity that has the dynamic context of damage was initialized to 0.

Particularly, make up in the method for operation of state in complete context, thereby making header compressed state exchange more than or equal to threshold value at the accumulated quantity of the terminal of the complete context that has damage is that complete context makes up under the situation of state, has the accumulated quantity of terminal of dynamic context of damage and the accumulated quantity of terminal that has a complete context of damage and is both initialized to 0.

Discuss this, the method and system that is used to compress with transmitting multimedia data of the present invention has following advantage.

That is exactly, if being structured in a plurality of terminals of complete context failed, UTRAN (transmitter side) is transformed into complete context apace and makes up state, if and the structure of dynamic context is failed, UTRAN is transformed into dynamic context apace and makes up state, and therefore a plurality of terminals can normally receive header compressed MBMS data with ROHC technology U-pattern.Like this, efficiency of transmission can be enhanced.

Aforesaid embodiment and advantage only are examples and and are not interpreted as limitation of the present invention.Present technique can easily be applied to the device of other type.Description of the invention does not limit the scope of the claims just as example.A variety of replacements, modifications and variations are apparent for those skilled in the art.In the claims, the clause that method adds function is intended to cover structure described herein when carrying out described function, and covers to be not only and structurally be equal to and be equivalent configurations.

Claims

1, the method for a kind of compression of wireless system and transmitting multimedia data, wherein, multi-medium data is with header compressed technique compresses and broadcast or multicast to down link,

It is characterized in that based on the complete context that receives from terminal-damage information, the complete context that is transformed into header compressed technology makes up state, and uses the grouping that receives from terminal successfully to make up a complete context to be higher than particular rate.

2, the method for claim 1 is characterized in that, the described complete context structure state that is transformed into comprises:

Based on the complete context-damage information of terminal transmission when complete context is damaged, accumulative total has impaired complete contextual terminal quantity; With

Whether inspection has the accumulated quantity of impaired complete contextual terminal more than or equal to threshold value, if and the accumulated quantity that has an impaired complete contextual terminal makes up state to header compressed state exchange to complete context during more than or equal to threshold value.

3, the method for claim 1 is characterized in that, if multi-medium data is compressed with this complete context structure state, then this compressed multi-medium data is transferred to a plurality of terminals with the form of full header grouping.

4, the method for claim 1 is characterized in that, this compress technique is the U-pattern of ROHC (robust header compression) technology.

5, method as claimed in claim 2 is characterized in that, threshold value is arranged in radio frequency resource control (RRC) layer of UTRAN.

6, method as claimed in claim 2 is characterized in that, threshold value is arranged in the header compressed processing layer of UTRAN.

7, method as claimed in claim 2 is characterized in that, the terminal quantity that has impaired complete context is by accumulative total in the rrc layer of transmitter side UTRAN.

8, method as claimed in claim 3, it is characterized in that, when terminal used the full header grouping to make up the context failure, it sent to its rrc layer to complete context-damage information, and the rrc layer of this terminal is the rrc layer of this complete context-damage message transmission to UTRAN then.

9, method as claimed in claim 8 is characterized in that, the complete context of this terminal-damage information is sent to UTRAN with RRC message.

As claim 1 or 5 described methods, it is characterized in that 10, relatively is to carry out at the rrc layer place of transmitter side UTRAN between terminal quantity that has impaired complete context and the threshold value in the rrc layer setting of UTRAN.

As claim 1 or 6 described methods, it is characterized in that 11, relatively is to carry out at the header compressed processing layer place of UTRAN between terminal quantity that has impaired complete context and the threshold value in the rrc layer setting of UTRAN.

12, method as claimed in claim 10, it is characterized in that, if the accumulated quantity of terminal that has impaired complete context is more than or equal to threshold value, the header compressed processing layer of this UTRAN of rrc layer order of this UTRAN is transformed into complete context and makes up state.

13, method as claimed in claim 12 is characterized in that, the header compressed processing layer of this UTRAN makes up state to header compressed state exchange to complete context.

14, method as claimed in claim 11 is characterized in that, if the accumulated quantity of terminal that has impaired complete context more than or equal to threshold value, the header compressed processing layer of this UTRAN makes up state to header compressed state exchange to complete context.

As claim 13 and 14 described methods, it is characterized in that 15, when header compressed state was switched to complete context structure state, the accumulated quantity that has the terminal of impaired complete context was initialized to 0.

16, a kind of in wireless system the compression and the described method of transmitting multimedia data, wherein, multi-medium data is by header compressed technique compresses and broadcast or multicast to down link,

It is characterized in that based on the dynamic context-damage information that receives from terminal, the dynamic context that is transformed into header compressed technology makes up state, and uses the grouping that receives from terminal successfully to make up a dynamic context to be higher than certain speed.

17, method as claimed in claim 16 is characterized in that, the described context structure state that is transformed into comprises:

Based on the dynamic context-damage information of terminal transmission when dynamic context is damaged, accumulative total has the terminal quantity of impaired dynamic context; With

Whether inspection has the accumulated quantity of terminal of impaired dynamic context more than or equal to threshold value, if and the accumulated quantity of terminal that has an impaired dynamic context makes up state to header compressed state exchange to dynamic context during more than or equal to threshold value.

18, method as claimed in claim 16 is characterized in that, if data are compressed with this dynamic context structure state, then these compressed data are transferred to a plurality of terminals with the form that dynamic context makes up grouping.

19, method as claimed in claim 16 is characterized in that, this compress technique is the U-pattern of ROHC (robust header compression) technology.

20, method as claimed in claim 17 is characterized in that, threshold value is arranged in radio frequency resource control (RRC) layer of UTRAN.

21, method as claimed in claim 17 is characterized in that, threshold value is arranged in the header compressed processing layer of UTRAN.

22, method as claimed in claim 17 is characterized in that, the terminal quantity that has impaired dynamic context is by accumulative total in the rrc layer of transmitter side UTRAN.

23, method as claimed in claim 18, it is characterized in that, when terminal used dynamic stem grouping to make up the context failure, it sent to its rrc layer to dynamic context-damage information, and the rrc layer of this terminal is the rrc layer of this dynamic context-damage message transmission to UTRAN then.

24, method as claimed in claim 23 is characterized in that, this dynamic context-damage information uses RRC message to be transferred to UTRAN.

As claim 16 or 20 described methods, it is characterized in that 25, relatively is to carry out at the rrc layer place of transmitter side UTRAN between the threshold value that is provided with in terminal quantity that has impaired dynamic context and the rrc layer at UTRAN.

As claim 16 or 21 described methods, it is characterized in that 26, relatively is to carry out at the header compressed processing layer place of UTRAN between the threshold value that is provided with in terminal quantity that has impaired dynamic context and the rrc layer at UTRAN.

27, method as claimed in claim 25, it is characterized in that, if the accumulated quantity of terminal that has impaired dynamic context is more than or equal to threshold value, the header compressed processing layer of this UTRAN of rrc layer order of this UTRAN is transformed into dynamic context and makes up state.

28, method as claimed in claim 27 is characterized in that, the header compressed processing layer of this UTRAN makes up state to header compressed state exchange to dynamic context.

29, method as claimed in claim 26 is characterized in that, if the accumulated quantity of terminal that has impaired dynamic context more than or equal to threshold value, the header compressed processing layer of this UTRAN makes up state to header compressed state exchange to dynamic context.

As claim 28 or 29 described methods, it is characterized in that 30, when header compressed state was switched to dynamic context structure state, the accumulated quantity that has the terminal of impaired dynamic context was initialized to 0.

31, as claim 28 or 29 described methods, it is characterized in that, when header compressed state was switched to dynamic context structure state, the accumulated quantity that has the terminal of impaired complete context was both initialized to 0 with the terminal quantity that has impaired dynamic context.

32, a kind of multi-medium data compression and system for transmitting, wherein, multi-medium data is with header compressed technique compresses and broadcast or multicast to down link, it is characterized in that described system comprises:

UTRAN, the type that is used for based on context making up state is used the U-mode compression MBMS data of ROHC technology and is transmitted it; With

Terminal is used for making up corresponding context from the grouping that receives, and arrives transmitter side UTRAN in following the corresponding context-damage message transmission of situation that makes up the context failure.

33, system as claimed in claim 32 is characterized in that, the terminal quantity that has impaired complete context adds up by rrc layer with the terminal quantity that has impaired dynamic context.

34, system as claimed in claim 32 is characterized in that, UTRAN is provided with threshold value at rrc layer and header compressed processing layer, so that the terminal quantity that has impaired complete context and the terminal quantity that has impaired dynamic context and they are compared.

35, system as claimed in claim 32, it is characterized in that, when have be damaged contextual terminal quantity and threshold ratio than the time, if have when being damaged contextual terminal quantity and being equal to or greater than the threshold value that presets, UTRAN order this header compressed processing layer header compressed state exchange to complete context structure state or dynamic context structure state.

36, a kind of multi-medium data of wireless system compresses and transmits described method, and wherein, multi-medium data uses specific compress technique transmission, it is characterized in that described method comprises:

Grouping in real time is transferred to mobile radio station from fixed station;

Be received in state information in this grouping in real time from this mobile radio station;

Number count to the state information that receives; With

Result according to this counting changes header compressed state.

37, method as claimed in claim 36 is characterized in that, described method further comprises:

The quantity of count status information and threshold ratio; With

If count value more than or equal to threshold value, makes up state to header compressed state exchange to complete context.

38, method as claimed in claim 37 is characterized in that, this threshold value is to be transmitted from rrc layer.

39, method as claimed in claim 36 is characterized in that, this compress technique is the U-pattern of ROHC (robust header compression) technology.

40, method as claimed in claim 36 is characterized in that, this state information is context-damage information.

41, method as claimed in claim 40 is characterized in that, this context-damage information is complete context-damage information or dynamic context-damage information.

42, method as claimed in claim 36 is characterized in that, this header compressed state is converted and overtime irrelevant with current context state.

43, a kind of multi-medium data of wireless system compresses and transmits described method, and wherein, multi-medium data is with header compressed technique compresses and broadcast or multicast to down link,

It is characterized in that the conversion of the context structure state of described header compressed technology is based on the context-damage information that receives from terminal and decides.

44, method as claimed in claim 43 is characterized in that, described context-damage information is complete context-damage information or dynamic context-damage information.