CN1992671A - Method for transmitting IP header compression data packet in the third-generation evolution system - Google Patents
Method for transmitting IP header compression data packet in the third-generation evolution system Download PDFInfo
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Abstract
The invention discloses a transmitting IP header compression data packet method in the third-generation evolution system, which compressing the IP header in the user equipment and core network equipment, and respectively creating user context in core network equipment and evolution wireless access network equipment for each user; and between these two equipments establishing a tunnel for this user; according to the user context information, the evolution wireless access network equipment maps the wireless interface QoS parameters of user IP header compression data packets to the QoS parameters of the bearing network, or vice versa; using the QoS parameters of the bearing network to package the user's IP header compression data packets, and transmitting through the corresponding tunnel; between the evolution wireless access network equipment and user device, using the channel corresponding to the wireless interface QoS parameters to send the user's IP header compression data packets. Using the invention, it can simply and effectively realize the IP header compression technology of the user equipment and core network equipment in the evolutionary 3GPP system, to increase the wireless transmission efficiency.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to the method for IP compressed data packets of transmission in a kind of third generation evolution system.
Background technology
Because FP (Frame Protocol) frame of speech business is less than 40 bytes, the expense that traditional UDP/IP (user datagram protocol/Internet Protocol) head produces reaches 50～100%, therefore adopt the IP head compression technology expense that UDP/IP produces can be reduced to 2～3 bytes from 28 bytes, thereby greatly reduce the expense that short grouping transmits, improve the efficient of grouping service wireless transmission.
In traditional 3GPP system, in the RNC (radio network controller) of UE (user terminal) and UTRAN (Universal Terrestrial Radio Access Network), realize the compression of IP head, as shown in Figure 1:
In Fig. 1, the function of IP head compression is on the RNC in UE and wireless access network, to preserve the context that relevant IP head compresses among the RNC.When user UE when a wireless access network (as the UTRAN A the figure) moves to another wireless access network (as the UTRAN B among the figure), then IP compressed context in the former wireless access network (as the RNC among the UTRAN A) to be transferred to new wireless access network (RNC among the UTRAN B).When the user when UTRAN B moves to UTRAN C, the equipment of the core network SGSN A of service UE switches to SGSN B, irrelevant because of SGSN and the compression of IP head, SGSN does not have the context of relevant IP head compression.When therefore between SGSN, switching, in SGSN, there is not the relevant contextual transmission of IP head compression.
Between RNC and UE, exist another network entity Node B, Node B transmits pellucidly to the IP packet of compression.Carry out transfer of data by ATM (asynchronous transfer mode) or IP (Internet Protocol) bearer network between Node B and the RNC.When carrying out transfer of data by the ATM bearer network between Node B and the RNC,, can guarantee the QoS of different business because of the ATM bearer network has the assurance mechanism of QoS.When adopting the UDP/IP transmission between Node B and the RNC, the centre also might exist ip router and IP Switch etc., because of not needing to adopt TOS (COS) in the IP head or Traffic Class to identify to be provided with the scheduling of IP priority of data packets, it mainly is to realize assurance to the QoS of different business by IP switching technology at a high speed.
For the correct transmission that the IP that guarantees the compression of IP head flows, need to use tunneling technique.In the Release version of 3GPP before Release7, between the SGSN of RNC and core net (GPRS serving GPRS support node), used GTP (GPRS Tunnel Protocol) agreement, and for each user, if its IP address is different or/differently with the QoS of use Session (session) all to use a different GTP tunnel; The tunnel of this GTP has determined the QoS of Session in the above.The QoS difference is just set up different tunnels; Even and QoS is identical,, equally also can use different tunnels if APN (Access Point Name) is different.
And, in traditional 3GPP system, has the Iur interface between the different RNCs, like this when UE switches between different RNCs, between DRNC (Drift Radio Network Controller) and SRNC (Serving RNC), also will set up the tunnel of a plurality of GTP-U (GPRS Tunnel Protocol user face) as RNC and SGSN: IP difference (being actually the APN difference) is or/and the different Session of QoS all will set up a plurality of GTP tunnels between SRNC and the DRNC when switching; Simultaneously between RNC after the SRNS reorientation and SGSN, also to set up a plurality of GTP tunnels.
But for the 3GPP evolution system, network element between UE and the core net is E UTRAN (an evolution wireless access network), when on UE and core net, realizing the compression of IP head, being located at the network element of realizing the compression of IP head in the core net is the connecting system gateway, then in the connecting system gateway of UE and core net, all preserve the context of its IP head compression, as shown in Figure 2:
When UE switches, if the core net access point that UE inserts is constant, as process among Fig. 2 1. shown in, UE switches to wireless access network B from the wireless access network A of connecting system net A, then the IP of core net connecting system compressed context content remains unchanged; If the access point of the core net that UE inserts changes, then former core net access point need be delivered to new core net access point with IP compressed context.Be positioned at the network node of the centre of IP compression position (UE and core net), then because of there not being IP compressed context, therefore in the process of switching, just do not exist the process of transmitting IP compressed context as E UTRAN.As shown in Figure 2, process 2. in, UE moves to wireless access network C from wireless access network B, the connecting system gateway A of core net needs its IP compressed context is delivered to connecting system gateway B.
When the connecting system gateway of core net and UE realized the compression of IP head, the connecting system gateway of core net and UE must preserve IP compressed context, and will transmit between the connecting system gateway in the process of switching.Intermediate node connecting system between this moment connecting system gateway and the UE, then there are not IP compressed context data as 3GPP E_UTRAN, like this, this IP head compresses the obtaining, be provided with and dispatch then and have difficulties of qos parameter of pairing IP traffic, is embodied in following several respects:
1.QoS parameter can't be obtained.Because of the connecting system gateway and the compression of UE use IP head of core net, the network node E_UTRAN between connecting system gateway and the UE is invisible to the content of IP head, therefore can't know IP entrained qos parameter of IP traffic.
2. the qos parameter of air interface can't match mutually with the QoS of ip-layer flow.Because of using the compression of IP head, E UTRAN can't be known the identification parameter in the IP head, also just can't be with the data map with qos parameter that obtains from air interface to the IP traffic of corresponding QoS; Similarly, also the data that the IP head that obtains from the connecting system gateway can't be compressed send to UE with the qos parameter of the air interface of correspondence, thereby can not be provided with, dispatch Radio Resource with suitable qos parameter.
3. be similar between the RNC and SGSN of traditional 3GPP system, need between the different RNCs, between E UTRAN and connecting system gateway, also need to use tunneling technique to transmit IP compressed data packets between the different E UTRAN for each user sets up one or more GTP tunnels.The complexity that the foundation of a plurality of GTP tunnels will the increase system realizes and switches, and can reduce the probability of performance of handoffs and reliability success.
Summary of the invention
The method that the purpose of this invention is to provide IP compressed data packets of transmission in a kind of third generation evolution system, E_UTRAN can't be known the qos parameter in the IP head when using the IP head compression technology to solve in the 3GPP evolution system, making whole wireless air interface and bearer network can't carry out QoS is provided with and scheduling, and between E_UTRAN and connecting system gateway, also need to use a plurality of tunnels between the different E UTRAN, the system that makes realizes complicated, influence the problem of performance of handoffs, simply, in the 3GPP of evolution system, realize the IP head compression technology effectively, improve wireless transmission efficient.
For this reason, the invention provides following technical scheme:
The method of IP compressed data packets of transmission in a kind of third generation evolution system, described third generation evolution wireless communication system comprises core net, evolution wireless access network and subscriber equipment, and on subscriber equipment and equipment of the core network, the IP head is compressed, described method comprises:
On equipment of the core network and evolution wireless access network equipment, be respectively each user and create user's context;
In the time that IP compressed data packets of user need be transmitted, set up the tunnel of a correspondence for this user between evolution wireless access network equipment and equipment of the core network;
The wave point service quality QoS parameter of a user uplink IP compressed data packets is mapped as the bearer network qos parameter or the bearer network qos parameter of user's downstream IP compressed data packets is mapped as the wave point qos parameter according to its user context information by the evolution wireless access network equipment;
Encapsulate this user's IP compressed data packets with described bearer network qos parameter, and between evolution wireless access network equipment and equipment of the core network by transmitting in the tunnel corresponding with this user;
Between evolution wireless access network equipment and subscriber equipment, transmit this user's IP compressed data packets with the channel corresponding with described wave point qos parameter.
The described user's context of creating for each user on equipment of the core network comprises at least: User Identity, tunnel context;
The described user's context of creating for each user on the evolution wireless access network equipment comprises at least: wave point user ID, wave point up-downgoing qos parameter set, tunnel context, QoS mapping table;
Described tunnel context comprises at least: local tunnel node identification, far-end tunnel node identification, bearer network type, bearer network up-downgoing QoS.
Each user has a unique described wave point user ID on wave point, and corresponding with the described local tunnel node identification TEID of its use in the evolution wireless access network equipment.
Each user has an international mobile subscriber identity IMSI and a plurality of other Non-Access Stratum signs, and corresponding with the described local tunnel node identification of its use in equipment of the core network.
Describedly according to its user context information the step that the wave point qos parameter of a user uplink IP compressed data packets is mapped as the bearer network qos parameter is comprised by the evolution wireless access network equipment:
The evolution wireless access network equipment is according to the channel of IP the compressed data packets that receives the subscriber equipment transmission and the wave point qos parameter that radio interface parameter obtains this packet;
According to the QoS mapping table in the user context information corresponding described wave point qos parameter is mapped as the bearer network qos parameter with this user.
Describedly according to its user context information the step that the bearer network qos parameter of user's downstream IP compressed data packets is mapped as the wave point qos parameter is comprised by the evolution wireless access network equipment:
The evolution wireless access network equipment obtains equipment of the core network by the bearer network qos parameter in the IP head of IP compressed data packets of tunnel transmission;
According to the QoS mapping table in the user context information corresponding described bearer network qos parameter is mapped as the wave point qos parameter with this user.
Described method further comprises:
To be carried on for the tunnel that the user sets up based on Internet Protocol the 4th version IPv4 agreement or Internet Protocol sixth version this IPv6 agreement or the bearer network based on multiprotocol label switching MPLS.
If the tunnel of setting up for the user is carried on the bearer network based on the IPv4 agreement, the bearer network up-downgoing QoS in the then described tunnel context is corresponding with the COS TOS parameter in the IPv4 head;
If the tunnel of setting up for the user is carried on the bearer network based on the IPv6 agreement, the bearer network up-downgoing QoS in the then described tunnel context is corresponding with the discharge pattern Traffic Class parameter in the IPv6 head;
If the tunnel of setting up for the user is carried on the bearer network based on MPLS, the bearer network up-downgoing QoS in the then described tunnel context is corresponding with differentiated services code-point territory DSCP in the MPLS head.
Preferably, evolution wireless access network equipment and equipment of the core network are removed tunnel that should the user according to the active state of subscriber equipment and/or available resources state, and deletion or forbid on evolution wireless access network equipment and the equipment of the core network tunnel context information that should the user.
Preferably, when subscriber equipment shutdown or subscriber equipment move to new wireless access system, remove tunnel that should the user, and deletion or forbid on evolution wireless access network equipment and the equipment of the core network tunnel context information that should the user.
Preferably, when subscriber equipment switches between different evolution wireless access networks, between source wireless access network equipment and purpose wireless access network equipment,, also do not send to the data of subscriber equipment with the transmission sources wireless access network equipment for this user sets up one and the handover tunnel of a correspondence only.
Preferably, set switching timer; After described handover tunnel is set up, start this switching timer; After the described switching timer time arrived, deletion was to handover tunnel that should the user.
Described equipment of the core network is specially: connecting system gateway or Mobility Management Entity/user plane entity.
Described evolution wireless access network equipment is specially: radio network controller and/or base station.
By above technical scheme provided by the invention as can be seen, the present invention in the evolution system of 3GPP when core net and UE carry out the compression of IP head to each user between equipment of the core network (for example connecting system gateway A SGW) and E UTRAN, and between source E UTRAN and purpose E UTRAN, only set up a tunnel corresponding when switching with this user, make that the transmission of IP compressed data packets is more succinct, improved reliability of data transmission and real-time.
By setting up user's context on net equipment, solved the qos parameter invisible problem of IP packet after because of the compression of IP head at E UTRAN equipment and nuclear.
The mutual mapping of the qos parameter of bearer network up-downgoing qos parameter and bearer network in the qos parameter of bearer network up-downgoing qos parameter and user radio interface, the Tunnel context in bearer network up-downgoing qos parameter, the Tunnel context in QoS by IP compressed data packets and the Tunnel context has solved the problems such as setting, scheduling of the invisible QoS that causes of qos parameter after the compression of IP head.
In addition, in the mapping one by one of the sign of wave point, solved the identified problems a when user only uses a tunnel by IMSI User Identity such as (international mobile subscriber identitys) and tunnel node identification TEID (local tunnel node identification, far-end tunnel node identification) and user.
Description of drawings
Fig. 1 is a theory diagram of realizing IP compressed data packets transmission in the traditional 3G system;
Fig. 2 is a theory diagram of realizing IP compressed data packets transmission in the 3GPP evolution system;
Fig. 3 is the realization flow figure of the inventive method;
Fig. 4 is the encapsulation process schematic diagram of IP packet when core net is transmitted of subscriber equipment;
Fig. 5 is the encapsulation process schematic diagram of IP packet when user device transmissions of core net;
Fig. 6 is the transmitted in both directions process schematic diagram of IP compressed data packets;
Fig. 7 is the mapping schematic diagram of QoS in the IP packet transmitted in both directions process.
Embodiment
Core of the present invention is when on the core net of 3GPP evolution wireless communication system and subscriber equipment the IP head being compressed, on equipment of the core network and evolution wireless access network equipment, be respectively each user and create a user's context, in this user's context, comprise information such as user ID and tunnel context.In the time that IP compressed data packets of user need be transmitted, set up the tunnel of a correspondence for this user between evolution wireless access network equipment and equipment of the core network; The wave point qos parameter of a user uplink IP compressed data packets is mapped as the bearer network qos parameter or the bearer network qos parameter of user's downstream IP compressed data packets is mapped as the wave point qos parameter according to its user context information by the evolution wireless access network equipment.Like this, encapsulate this user's IP compressed data packets, make the bearer network can be according to this QoS, to transmit IP compressed data packets in the tunnel of certain priority this user's correspondence between evolution wireless access network equipment and equipment of the core network by the bearer network qos parameter; And between evolution wireless access network equipment and subscriber equipment, transmit this user's IP compressed data packets with the channel corresponding with described wave point qos parameter.
For the evolution wireless access network equipment, need comprise wave point user ID, wave point up-downgoing qos parameter set, tunnel context, QoS mapping table at least for the context that each user creates.
Such as, the user's context of creating on the evolution wireless access network equipment comprises following content:
■ wave point user ID USID
■ wave point up-downgoing qos parameter set
■ Tunnel context
{
● local tunnel node identification TEID_A, far-end tunnel node identification TEID_B;
● the bearer network type;
● bearer network address, transport layer protocol, port numbers etc.;
● bearer network up-downgoing QoS;
●N_PDU(UL/DL)；
●......
}
■ QoS mapping table
{
● bearer network QoS_1, { wave point qos parameter set 1};
● bearer network QoS_2, { wave point qos parameter set 2};
● bearer network QoS_3, { wave point qos parameter set 3};
●......
}
For equipment of the core network, need comprise User Identity, tunnel context at least for the context that each user creates.
Such as, the user's context of creating on equipment of the core network comprises following content:
The ■ user ID
{
● international mobile subscriber identity IMSI
●E.164
● SIP URL (session initiation protocol unified resource identifier)
● provisional sign (being similar to grouping temporarily moved subscriber identification P-TMSI)
●.....
}
■ Tunnel context
{
● local tunnel node identification TEID_B, far-end tunnel node identification TEID_A;
● the bearer network type;
● bearer network address, transport layer protocol, port numbers etc.;
● bearer network up-downgoing QoS;
●N_PDU(UL/DL)
●......
}
Wherein, the up-downgoing sequence number of N_PDU (UL/DL) expression PDU.PDU is an IP compressed data packet, and UL represents up, and DL represents descending.N_PDU (UL/DL) is up-downgoing IP packed data packet number just.
Each user has a unique described wave point user ID USID on wave point, and corresponding with the local tunnel node identification of its use in the evolution wireless access network equipment.
Equally, each user has an international mobile subscriber identity IMSI and a plurality of other Non-Access Stratum signs, and corresponding with the local tunnel node identification of its use in equipment of the core network.Because of an IMSI user can have a plurality of Non-Access Stratum user ID simultaneously, therefore each Non-Access Stratum sign can only be corresponding to an IMSI, also just can only identify, but a TEID sign is corresponding to one or more Non-Access Stratum user ID corresponding to a TEID.
In addition, owing to be on subscriber equipment and equipment of the core network, to carry out the compression of IP head, therefore on equipment of the core network, also preserve IP compressed context.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 3, Fig. 3 shows the realization flow of the inventive method, may further comprise the steps:
Step 301: on equipment of the core network and E_UTRAN (evolution wireless access network) equipment, be respectively each user and create user's context.
The content of user's context can be with reference to the description of front.
Step 302: in the time need between evolution wireless access network equipment and equipment of the core network, transmitting IP compressed data packets of user, set up the tunnel of a correspondence for this user.
For example, the IP head of the data of the IP stream between the connecting system gateway of UE and core net compresses, and then must use tunneling technique between connecting system gateway and the connecting system.The method of use tunneling technique has multiple, such as, can adopt GTP (GPRS Tunnel Protocol) agreement etc.
The tunnel header structure of the tunnel protocol that uses can adopt the header structure of existing tunnel agreement, also can be self-defined, comprise following content such as definition of T unnel header structure:
■Version
■Message?Type
■ QoS (optional)
■Length
■TEID
■UL?N_PDU
■DL?N_PDU
■Next?Extension?Header?TYpe
■Data
Wherein, the data item before the Data is the Tunnel head, and Data is the data of Tunnel encapsulation.
Version is a version number;
Message Type is the message name of Tunnel, then is not control messages when Tunnel transmits data, and Message Type is the retention of a special use, as-1.
QoS is the employed QoS of Tunnel data for this reason, and this parameter is an option.
Length is the length of data package of whole Tunnel.The packet header that the length of Tunnel data deducts Tunnel just can obtain its concrete length scale.
TEID is recipient's a tunnel node identification TEID value.
UL N_PDU: the sequence number of up PDU (protocol Data Unit).Be similar to the sequence number in TCP (transmission control protocol) head: for ASGW (connecting system gateway), be the sequence number of the PDU that next time receives, ASGW notifies E_UTRAN (evolution wireless access network) to send to the Data Position of ASGW or the position that ASGW receives data next time by the sequence number of UL N_PDU next time.The UL N_PDU of ASGW increases according to the length that receives the Tunnel data.E_UTRAN is by the position of the data of the Tunnel of the sequence number notice ASGW E_UTRAN transmission next time of ULN_PDU or the position that ASGW receives data next time.The UL N_PDU of E_UTRAN increases according to the length that sends the Tunnel data.
DL N_PDU: the sequence number of descending PDU.Be similar to the sequence number in the TCP head equally: for ASGW, be the sequence number of the PDU that next time sends, the sequence number notice E_UTRAN of ASGW by DL N_PDU be ASGW position that the Data Position that sends or E_UTRAN are received data next time next time.The DL N_PDU of ASGW increases according to the length that sends the Tunnel data.The position of the data of the Tunnel that the sequence number notice ASGW of E_UTRAN by DL N_PDU receives next time or the position that ASGW sends data next time.The UL N_PDU of E_UTRAN increases according to the length that sends the Tunnel data.
Next Extension Header TYpe defines for the Tunnel head of supporting expansion.
In the present invention, reaching when switching between wireless access network equipment and the equipment of the core network is that a user only sets up a tunnel between source wireless access network equipment and purpose wireless access network equipment, rather than different business sets up different tunnels, can reduce contextual number widely like this.
The tunnel of each user between wireless access network equipment and equipment of the core network all has one and have only a Tunnel context corresponding with it on wireless access network equipment and equipment of the core network.When do switching, the tunnel of the user between source wireless access network equipment and purpose wireless access network equipment also all has one and have only a Tunnel context corresponding with it on these two equipment.Each tunnel is identified uniquely by among the TEID of tunnel two end nodes any.The tunnel terminal device guarantees the uniqueness of the TEID of its distribution.
To be carried on for the tunnel that the user sets up based on IPv4 (Internet Protocol the 4th version) agreement or IPv6 (Internet Protocol sixth version this) agreement or the bearer network based on MPLS (multiprotocol label switching) etc.Therefore, need define the type of the bearer network in tunnel at tunnel context, address and the source port in the IP network, destination interface and the employed transport layer protocol of each end points of tunnel is UDP or other agreements.
Like this, the bearer network up-downgoing QoS in the tunnel context is then corresponding with TOS (COS) parameter, Traffic Class (discharge pattern) parameter in the IPv6 head, DSCP (differentiated services code-point territory) in the MPLS head in the IPv4 head respectively.
Step 303: according to its user context information the wave point qos parameter of a user uplink IP compressed data packets is mapped as the bearer network qos parameter or the bearer network qos parameter of user's downstream IP compressed data packets is mapped as the wave point qos parameter by the evolution wireless access network equipment.
Step 304: encapsulate this user's IP compressed data packets with the bearer network qos parameter, and between evolution wireless access network equipment and equipment of the core network by transmitting in the tunnel corresponding with this user.
Step 305: IP the compressed data packets that between evolution wireless access network equipment and subscriber equipment, transmits this user with the channel corresponding with the wave point qos parameter.
Be example with ASGW in the 3GPP evolution system and E_UTRAN below, describe IP packed data in detail and wrap in encapsulation and transmission course between UE and the ASGW.
Fig. 4 shows the process of the IP data packet transmission of subscriber equipment to core net:
Wherein, UP1 represents the unpressed IP packet of UE, comprises the TOS parameter in the IP head; UE compresses according to IP compressed context of its preservation IP head with UP1, and the IP packet after the compression is UP2, because the IP head compresses, so the QoS in the TOS parameter is invisible in UP2.UP2 after UE will compress sends to E_UTRAN.
After E_UTRAN receives this packet,, be used to transmit this user's IP compressed data packets for this user sets up corresponding tunnel; Tunnel head, i.e. UP3 are gone up in IP the packed data encrust encapsulation of receiving; Then, the tunnel is carried on the IP network transmits,, also need the qos parameter in the IP head of the unpressed packet UP1 of UE be mapped in this outer IP head of Tunnel head at Tunnel outer package one deck IP head for this reason, the IP data after the encapsulation are UP4.
Fig. 5 shows the process of the IP data packet transmission of core net to subscriber equipment:
Wherein, DN1 represents the unpressed IP packet of ASGW, comprises the TOS parameter in the IP head; ASGW compresses according to IP compressed context of its preservation IP head with UP1, and the IP packet after the compression is DN2, because the IP head compresses, so the QoS in the TOS parameter is invisible, need transmit by the tunnel in DN2.ASGW is used to transmit this user's IP compressed data packets for this user sets up corresponding tunnel; Tunnel head, i.e. DN3 are gone up in IP packed data encrust encapsulation; Then, the tunnel is carried on the IP network transmits,, also need the qos parameter in the IP head of unpressed packet DN1 be mapped in this outer IP head of Tunnel head at Tunnel outer package one deck IP head for this reason, the IP data after the encapsulation are DN4.
For same user, between UE and ASGW, only set up a tunnel for it, determine by local tunnel node identification in the tunnel context and far-end tunnel node identification.The transmitted in both directions process of IP compressed data packets as shown in Figure 6.
The mapping process of the qos parameter in the above-mentioned IP head is as shown in Figure 7:
In E_UTRAN, qos parameter in the tunnel context and the qos parameter in the wave point shine upon mutually.Tunneling data that E_UTRAN will receive from core net or the data of when switching, receiving from the source connecting system, obtain the qos parameter in tunnel, then this QoS is mapped to the qos parameter of wave point, the qos parameter of the wave point that the compressed data packets of the IP in its tunnel packet is obtained according to mapping sends to UE then.Equally, E_UTRAN obtains IP compressed data packets with the qos parameter of certain wave point, then the qos parameter of this wave point is mapped as the qos parameter in tunnel, and encapsulate this IP compressed data packets with the qos parameter in this tunnel that shines upon, IP compressed data packets after the encapsulation sent to core net.
In user's context, the qos parameter in the tunnel context and the qos parameter of bearer network (as IP network) are prepared and mapping mutually mutually.
When ASGW when UE sends the IP data, the qos parameter of IP data is set to the qos parameter in tunnel, after this IP packet carried out IP head compression, through unique tunnel of setting up in advance, send this IP compressed data packets to E_UTRAN by bearer network, bearer network is provided with according to this QoS and transmits this packet to E_UTRAN with certain priority.
When E_UTRAN receives the packet that receives with certain wireless qos parameter from air interface, just after IP compressed data packets, according to its wireless qos parameter setting, be mapped to a qos parameter in tunnel, then IP the compressed data packets of receiving encapsulated by the Tunnel head with the qos parameter that is mapped to, bearer network is sent to ASGW with certain priority with this packet according to the QoS in this tunnel.
Though above be example with ASGW and E_UTRAN, IP of the present invention compressed data packets transmission course is described, among the present invention, equipment of the core network is not defined as ASGW, such as, can also be MME/UPE (Mobility Management Entity/user plane entity) etc.; And the evolution wireless access network equipment can be radio network controller and/or base station.
Evolution wireless access network equipment and equipment of the core network are removed tunnel that should the user according to the active state of subscriber equipment and/or available resources state, and deletion or forbid on evolution wireless access network equipment and the equipment of the core network tunnel context information that should the user.
When subscriber equipment switches between different evolution wireless access networks, the handover tunnel that yet needs to set up for this user a correspondence between source wireless access network equipment and purpose wireless access network equipment does not also send to the data of subscriber equipment with the transmission sources wireless access network equipment.Simultaneously, also need the partial content with the user's context of former E_UTRAN, such as the up-downgoing sequence number in tunnel, copy among the new E_UTRAN, other content is then directly created in purpose E_UTRAN.
Switch finish after, deletion is to handover tunnel that should the user.Can set a switching timer, after handover tunnel is set up, start this switching timer, after the switching timer time arrives, can delete handover tunnel that should the user.
When subscriber equipment shutdown or subscriber equipment move to new wireless access system, remove tunnel that should the user, and deletion or forbid on evolution wireless access network equipment and the equipment of the core network tunnel context information that should the user.
The present invention can support to whole Tunnel packet or only to the encryption or the integrity protection of IP compressed data packets encapsulating in the Tunnel.Because of bearer network IP head or MPLS encapsulation header are not encrypted, therefore the QoS of the contextual QoS of Tunnel and bearer network can be done to shine upon and do not influence.And, can guarantee the transmission sequence of IP compressed data packets owing in tunnel context information, comprised the sequence number of up-downgoing packet, improve the efficient of IP head compression.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (14)
1, the method for IP compressed data packets of transmission in a kind of third generation evolution system, described third generation evolution wireless communication system comprises core net, evolution wireless access network and subscriber equipment, and on subscriber equipment and equipment of the core network, the IP head is compressed, it is characterized in that described method comprises:
On equipment of the core network and evolution wireless access network equipment, be respectively each user and create user's context;
In the time that IP compressed data packets of user need be transmitted, set up the tunnel of a correspondence for this user between evolution wireless access network equipment and equipment of the core network;
The wave point service quality QoS parameter of a user uplink IP compressed data packets is mapped as the bearer network qos parameter or the bearer network qos parameter of user's downstream IP compressed data packets is mapped as the wave point qos parameter according to its user context information by the evolution wireless access network equipment;
Encapsulate this user's IP compressed data packets with described bearer network qos parameter, and between evolution wireless access network equipment and equipment of the core network by transmitting in the tunnel corresponding with this user;
Between evolution wireless access network equipment and subscriber equipment, transmit this user's IP compressed data packets with the channel corresponding with described wave point qos parameter.
2, method according to claim 1 is characterized in that,
The described user's context of creating for each user on equipment of the core network comprises at least: User Identity, tunnel context;
The described user's context of creating for each user on the evolution wireless access network equipment comprises at least: wave point user ID, wave point up-downgoing qos parameter set, tunnel context, QoS mapping table;
Described tunnel context comprises at least: local tunnel node identification, far-end tunnel node identification, bearer network type, bearer network up-downgoing QoS.
3, method according to claim 2 is characterized in that, each user has a unique described wave point user ID on wave point, and corresponding with the described local tunnel node identification TEID of its use in the evolution wireless access network equipment.
4, method according to claim 2 is characterized in that, each user has an international mobile subscriber identity IMSI and a plurality of other Non-Access Stratum signs, and corresponding with the described local tunnel node identification of its use in equipment of the core network.
5, method according to claim 2 is characterized in that, describedly the step that the wave point qos parameter of a user uplink IP compressed data packets is mapped as the bearer network qos parameter is comprised according to its user context information by the evolution wireless access network equipment:
The evolution wireless access network equipment is according to the channel of IP the compressed data packets that receives the subscriber equipment transmission and the wave point qos parameter that radio interface parameter obtains this packet;
According to the QoS mapping table in the user context information corresponding described wave point qos parameter is mapped as the bearer network qos parameter with this user.
6, method according to claim 2 is characterized in that, describedly the step that the bearer network qos parameter of user's downstream IP compressed data packets is mapped as the wave point qos parameter is comprised according to its user context information by the evolution wireless access network equipment:
The evolution wireless access network equipment obtains equipment of the core network by the bearer network qos parameter in the IP head of IP compressed data packets of tunnel transmission;
According to the QoS mapping table in the user context information corresponding described bearer network qos parameter is mapped as the wave point qos parameter with this user.
7, method according to claim 2 is characterized in that, described method further comprises:
To be carried on for the tunnel that the user sets up based on Internet Protocol the 4th version IPv4 agreement or Internet Protocol sixth version this IPv6 agreement or the bearer network based on multiprotocol label switching MPLS.
8, method according to claim 7 is characterized in that,
If the tunnel of setting up for the user is carried on the bearer network based on the IPv4 agreement, the bearer network up-downgoing QoS in the then described tunnel context is corresponding with the COS TOS parameter in the IPv4 head;
If the tunnel of setting up for the user is carried on the bearer network based on the IPv6 agreement, the bearer network up-downgoing QoS in the then described tunnel context is corresponding with the discharge pattern Traffic Class parameter in the IPv6 head;
If the tunnel of setting up for the user is carried on the bearer network based on MPLS, the bearer network up-downgoing QoS in the then described tunnel context is corresponding with differentiated services code-point territory DSCP in the MPLS head.
9, method according to claim 1 is characterized in that, described method further comprises:
Evolution wireless access network equipment and equipment of the core network are removed tunnel that should the user according to the active state of subscriber equipment and/or available resources state, and deletion or forbid on evolution wireless access network equipment and the equipment of the core network tunnel context information that should the user.
10, method according to claim 1 is characterized in that, described method further comprises:
When subscriber equipment shutdown or subscriber equipment move to new wireless access system, remove tunnel that should the user, and deletion or forbid on evolution wireless access network equipment and the equipment of the core network tunnel context information that should the user.
11, method according to claim 1 is characterized in that, described method further comprises:
When subscriber equipment switches between different evolution wireless access networks, between source wireless access network equipment and purpose wireless access network equipment,, also do not send to the data of subscriber equipment with the transmission sources wireless access network equipment for this user sets up one and the handover tunnel of a correspondence only.
12, method according to claim 11 is characterized in that, described method further comprises:
Set switching timer;
After described handover tunnel is set up, start this switching timer;
After the described switching timer time arrived, deletion was to handover tunnel that should the user.
13, method according to claim 1 is characterized in that, described equipment of the core network is specially: connecting system gateway or Mobility Management Entity/user plane entity.
14, method according to claim 1 is characterized in that, described evolution wireless access network equipment is specially: radio network controller and/or base station.
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