WO2013029521A1 - 用于数据传输的方法、分流点设备、用户终端和系统 - Google Patents

用于数据传输的方法、分流点设备、用户终端和系统 Download PDF

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Publication number
WO2013029521A1
WO2013029521A1 PCT/CN2012/080635 CN2012080635W WO2013029521A1 WO 2013029521 A1 WO2013029521 A1 WO 2013029521A1 CN 2012080635 W CN2012080635 W CN 2012080635W WO 2013029521 A1 WO2013029521 A1 WO 2013029521A1
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WIPO (PCT)
Prior art keywords
air interface
service
user terminal
context information
connection context
Prior art date
Application number
PCT/CN2012/080635
Other languages
English (en)
French (fr)
Inventor
吴晔
张伟
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to RU2014111461/07A priority Critical patent/RU2565583C1/ru
Priority to KR1020147008029A priority patent/KR101557479B1/ko
Priority to BR112014004309A priority patent/BR112014004309A2/pt
Priority to EP12828860.2A priority patent/EP2741544B1/en
Publication of WO2013029521A1 publication Critical patent/WO2013029521A1/zh
Priority to US14/189,539 priority patent/US9451516B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/22Performing reselection for specific purposes for handling the traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18Negotiating wireless communication parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface
    • H04W36/144Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/24Connectivity information management, e.g. connectivity discovery or connectivity update

Definitions

  • the present invention relates to the field of communications and, more particularly, to a method, a point of sale device, a user terminal and a system for data transmission in the field of communications. Background technique
  • Multi-RAT multi-standard radio access technology
  • UE user equipment
  • the user's throughput can be improved and the user experience can be improved.
  • a WLAN Wireless Local Area Network
  • 3G The Third Generation
  • the WiFi-based shunting in the tightly coupled manner the data exchanged between the user terminal and the packet network can be performed through the 3G air interface provided by the 3G core network, the 3G access network, and the 3G access network, or through the 3G core network.
  • the WLAN access network and the WiFi air interface provided by the WLAN access network can also be performed through the 3G air interface and the WiFi air interface at the same time.
  • the CAM and 3G networks are used as an example to illustrate the tight coupling mode in the above examples, those skilled in the art may think that the tight coupling mode may also appear in other network architectures, such as WLAN and LTE networks.
  • WLAN and LTE networks In the existing Multi-RAT scenario, if the data transmission is provided to the UE through multiple air interfaces, when the air interface is unavailable, the service currently carried by the air interface is interrupted, causing the data transmission failure on the air interface. Due to the lack of a processing mechanism for services that are not available for air interface in the case of Multi-RAT, the data transmission of the UE is affected. Summary of the invention
  • the present invention provides a method for data transmission, a distribution point device, a user terminal, and a system, which can process services carried on an unavailable air interface in a Multi-RAT scenario, thereby providing a mechanism for processing a traffic failure mechanism for the data offload transmission mechanism. It is beneficial to avoid all interruption of the service corresponding to the data transmission performed by the UE through the air interface.
  • the present invention provides a method for data transmission, including: updating, when a first air interface is unavailable, connection context information corresponding to a service of a user terminal on the first air interface, where the user terminal passes the The first air interface is connected to the core network via the first access network; the first message is sent to the user terminal, and the first message carries update information related to the updated connection context information, and is used to enable the user
  • the terminal updates the connection context information corresponding to the service on the first air interface according to the update information to obtain the updated connection context information, and performs the updated connection context information and the user terminal according to the updated connection context information.
  • data transmission including: updating, when a first air interface is unavailable, connection context information corresponding to a service of a user terminal on the first air interface, where the user terminal passes the The first air interface is connected to the core network via the first access network; the first message is sent to the user terminal, and the first message carries update information related to the updated connection context information, and is used to enable the user
  • the terminal updates the connection context information corresponding
  • the present invention provides a method for data transmission, including: receiving, when a first air interface is unavailable, a first message sent by a power distribution point device, where the first message is carried by the device with the power distribution point Update information related to the connection context information corresponding to the service of the user terminal on the first air interface when the first air interface is unavailable, wherein the user terminal is connected to the core through the first air interface through the first access network And updating, according to the update information, connection context information currently corresponding to the service on the first air interface; and performing data transmission with the distribution point device according to the updated connection context information.
  • the present invention provides a distribution point device, including: an update module, configured to update connection context information corresponding to a service of the user terminal on the first air interface when the first air interface is unavailable, where the user The terminal is connected to the core network by using the first air interface, and the sending module is configured to send a first message to the user terminal, where the first message carries an update related to the updated connection context information.
  • the information is used to enable the user terminal to update the connection context information currently corresponding to the service on the first air interface according to the update information.
  • the updated connection context information is used by the transmission module, and configured to perform data transmission according to the updated connection context information and the user terminal.
  • the present invention provides a user terminal, including: a receiving module, configured to receive a first message sent by a distribution point device when the first air interface is unavailable, where the first message carries the device with the distribution point Update information related to the connection context information corresponding to the service of the user terminal updated on the first air interface when the first air interface is unavailable, wherein the user terminal is connected to the first air interface via the first access network a core network; an update module, configured to: update, according to the update information, connection context information that is currently corresponding to the service on the first air interface; and a transmission module, configured to use the updated connection context information and the distribution point The device performs data transmission.
  • a receiving module configured to receive a first message sent by a distribution point device when the first air interface is unavailable, where the first message carries the device with the distribution point Update information related to the connection context information corresponding to the service of the user terminal updated on the first air interface when the first air interface is unavailable, wherein the user terminal is connected to the first air interface via the first access network a core network
  • the present invention provides a system for data transmission, the system comprising a distribution point device and a user terminal.
  • the distribution point device is configured to: when the first air interface is unavailable, update the connection context information corresponding to the service of the user terminal on the first air interface, where the user terminal passes the first interface through the first air interface. Connecting to the core network; sending a first message to the user terminal, where the first message carries update information related to the updated connection context information; and the updated connection context information and the user terminal Data transfer.
  • the user terminal is configured to: when the first air interface is unavailable, receive the first message sent by the traffic point device; according to the update information, connect the current service corresponding to the service on the first air interface
  • the context information is updated; data transmission is performed with the distribution point device according to the updated connection context information.
  • the distribution point device may update the connection context information corresponding to the service carried by the first air interface and notify the user terminal, so that the traffic distribution device and the user terminal are related to the service on the first air interface.
  • the connection context information is consistent so that data can be successfully transmitted through consistent connection context information.
  • the traffic point device and the user terminal can still have the same connection context information, so that the data transmission can continue, so that the service carried by the current first air interface can be processed. It is beneficial to avoid the interruption of the service corresponding to the data transmission performed by the UE through the first air interface, and to ensure the continuity of the UE service as much as possible, thereby facilitating the communication experience of the user.
  • FIG. 1 is a flow chart of a method for data transmission in accordance with an embodiment of the present invention.
  • Figure 2 is an example of a network architecture for data offloading in a tightly coupled manner.
  • connection context information 3 is a flow chart of a method of updating connection context information in accordance with an embodiment of the present invention.
  • FIG. 4 is a flow chart of another method of updating connection context information in accordance with an embodiment of the present invention.
  • Figure 5 is a flow diagram of another method for data transmission in accordance with an embodiment of the present invention.
  • Figure 6 is a first example of a protocol stack in a Multi-RAT scenario.
  • Figure 7 is a second example of a protocol stack in a Multi-RAT scenario.
  • Fig. 8 is an example of an encapsulation format of application layer signaling between an access device and a branch point device of the first air interface in the first example and the second example.
  • Fig. 9 is an example of an encapsulation format of application layer signaling between an access device and a user terminal of the first air interface in the first and second examples.
  • FIG. 10 is a flow chart of still another method for data transmission in accordance with an embodiment of the present invention.
  • FIG. 11 is a flow chart of still another method for data transmission in accordance with an embodiment of the present invention.
  • FIG. 12 is a block diagram showing the structure of a power distribution point device according to an embodiment of the present invention.
  • Figure 13 is a block diagram showing the structure of another power distribution point device according to an embodiment of the present invention.
  • Figure 14 is a block diagram showing the structure of a further shunt point device according to an embodiment of the present invention.
  • FIG. 15 is a structural block diagram of a user terminal according to an embodiment of the present invention.
  • FIG. 16 is a structural block diagram of another user terminal according to an embodiment of the present invention.
  • 17 is a schematic diagram of a system for data transmission in accordance with an embodiment of the present invention. detailed description
  • the method 100 includes: In S110, when the first air interface is unavailable, the connection context information corresponding to the service of the user terminal on the first air interface is updated, where the user terminal is connected to the core network through the first access network through the first air interface;
  • the first message is sent to the user terminal, where the first message carries update information related to the updated connection context information, and is used to enable the user terminal to connect to the current service corresponding to the service on the first air interface according to the update information.
  • the context information is updated to obtain updated connection context information;
  • data transmission is performed according to the updated connection context information and the user terminal.
  • method 100 can be performed by a tap point device.
  • the uplink data is aggregated to the power distribution point device through the second air interface and the first air interface.
  • the packet data network sends the downlink data to the UE
  • the downlink data is diverted by the data at the branching point device, and the branching point device sends the other part of the data to the UE through the second air interface, and sends another part of the data to the UE through the first air interface.
  • the Radio Network Controller is a split point device.
  • the UE may access the 3G/UMTS core network through a UTRAN (UMTS Terrestrial Radio Access Network) including a Node B (Node B) and an RNC.
  • the UE may also access the 3G/UMTS core network through a WLAN access network including an Access Point (AP), where an Interworking Unit (IWU) is used to connect the AP to the RNC o.
  • a UTRAN UMTS Terrestrial Radio Access Network
  • AP Access Point
  • IWU Interworking Unit
  • the SGSN Server GPRS Support Node
  • GGSN Gateway GPRS Support Node
  • the UE can further access the Internet and receive packet data services.
  • the data transmitted by the UE to the Internet whether through the UMTS air interface provided by the UTRAN or the WiFi (Fireless Fidelity) air interface provided by the WLAN, will arrive at the RNC, and then the RNC transmits the data to the 3G/UMTS core network, thereby Data to the internet.
  • the data transmitted by the Internet to the UE will arrive at the RNC through the 3G/UMTS core network, and then the data will be shunted by the RNC, which can be transmitted to the UE through the UMTS air interface, and can also be transmitted to the UE through the WiFi air interface, and can also pass through the UMTS air interface and The WiFi air interface is transmitted to the UE.
  • the distribution point device is an RNC.
  • the distribution point device can also be SGSN, GGSN, PDN-GW (Packet Data Network-Gateway, Packet Data Network Gateway), S-GW (Serving-Gateway, Service).
  • the gateway or the base station integrated with multiple access systems, etc., the present invention does not limit the specific form of the distribution point device.
  • the branch point device can update the first air interface because the corresponding relationship between the service carried on the first air interface and the connection context information is saved on the distribution point device.
  • the connection context information corresponding to the service processes the data transmission on the first air interface.
  • the first air interface is unavailable.
  • the air interface transmits data such that the first air interface is unavailable to the user terminal.
  • the first air interface is unavailable.
  • the uplink of the first air interface is unavailable.
  • the downlink of the first air interface is unavailable.
  • the uplink and downlink of the first air interface are also unavailable.
  • connection context information corresponding to the service is used to represent the connection information involved in the service that the UE accepts the service.
  • the connection context information it can be determined by what resource transmission of the data of the service, so that the transmission path of the service and the change of the connection context information can be determined. Means a change in the service transmission path.
  • the connection context may include, but is not limited to, at least one of a Radio Access Bearer Identification (RAB ID) and a Packet Data Network Internet Protocol (PDN-IP) address, through the RAB ID.
  • RAB ID Radio Access Bearer Identification
  • PDN-IP Packet Data Network Internet Protocol
  • the UE accesses the core network through the second air interface and the first air interface at the same time.
  • the second air interface may be an air interface that provides a reliable wireless connection.
  • the UE may always camp on the second air interface and transmit on the second air interface.
  • the wireless access system corresponding to the second air interface may be referred to as a primary RAT. Whether the first air interface can provide a reliable wireless connection is not limited.
  • the wireless access system corresponding to the first air interface may be referred to as a secondary RAT, and the Multi-RAT does not guarantee the reliability of the link between the secondary RAT and the UE.
  • the reliability of the link between the secondary RAT and the UE in the data transmission may not be guaranteed because the secondary RAT itself lacks the reliability guarantee of the necessary data transmission link, such as the WiFi air interface provided by the WLAN; it may also be due to the Multi-RAT In the design, the reliability of the data link reliability in the original RAT is weakened in the design. For example, the signaling guarantee is used to ensure reliable signaling. .
  • the distribution point device updates the connection context letter corresponding to the service interacting with the UE on the first air interface.
  • the first air interface in which the problem occurs can be processed, so that the problem that the service can only be completely interrupted without the processing mechanism as in the prior art can be avoided, and the continuity of the UE service can be ensured as much as possible.
  • connection context information involved in the first air interface may be updated by the method 300 as shown in FIG.
  • the traffic distribution device caches the downlink data that is currently ready to be sent to the UE through the first air interface.
  • the data can be restored to the original IP packet and the IP packet is pushed into the temporary cache.
  • connection context corresponding to the service in the first service set to which the downlink data belongs is updated.
  • the downlink data buffered by the distribution point device may belong to different services, and the set of services to which the downlink data belongs is referred to as a first service set, and at least one service is included in the service set.
  • the distribution point device may update the connection context information corresponding to the service in the first service centralized manner by using S322 to S326.
  • the downlink information related to the downlink data buffered in S310 may be beneficial to the branch point device to determine whether the service to which the downlink data belongs can be moved to the second air interface for transmission.
  • the downlink information can be determined by the distribution point device in the process of buffering the downlink data.
  • the downlink information may include, but is not limited to, at least one of the following: how long it takes for the distribution point device to buffer the downlink data, the service to which the downlink data belongs, the amount of data of the downlink data, the QoS required for the downlink data, and the like.
  • the traffic distribution device can compare the QoS achieved after the migration with the QoS required by the downlink data to determine whether the QoS requirement is met when moving to the second air interface.
  • the service A represents any service in the first service set. For example, if the downlink data of the service A is transported from the first air interface to the second air interface and the transmission exceeds the maximum delay required by the service A, the service A is moved to the second air interface and the transmission does not satisfy the QoS requirement.
  • the maximum delay may be due to the excessive delay of the first air interface being unavailable by the distribution point device, and possibly due to the number of buffered downlinks. According to the excessive delay of the downlink data to start processing the service A, the processing delay of moving the downlink data of the service A from the first air interface to the second air interface may be too large.
  • the downlink data of service A is transported from the first air interface to the second air interface and the transmission cannot meet the throughput required by service A, then the service A is moved to the second air interface and the transmission does not meet the QoS requirement.
  • the inability to achieve the required throughput may be due to the limited wireless resources of the second air interface, or it may be due to the limitation of the way the second air interface transmits data.
  • connection context information corresponding to the service in the first service set that does not satisfy the QoS requirement is deleted and moved to the second air interface.
  • the service in the first service set is originally transmitted on the first air interface. Since the first air interface is not available, the service in the first service set needs to be moved to the second air interface for transmission. However, if the QoS requirement of the service cannot be satisfied if the migration is performed, the service transmission data transmission that does not satisfy the QoS requirement in the case of the handover is interrupted, and the connection context information corresponding to the service is deleted.
  • connection context information corresponding to the service in the first service set that meets the QoS requirement is moved to the second air interface, and is changed from being transmitted through the first air interface to being transmitted through the second air interface.
  • the data of the service may be transmitted through the second air interface, so that the connection context information corresponding to the service may be modified to be transmitted through the second air interface.
  • S326 is executed after S324, S326 may also be executed before S324, and may also be performed simultaneously with S324, and the order of execution thereof is not limited to the scope of protection of the present invention.
  • the buffered downlink data may also be processed according to the updated result.
  • the downlink data that is moved to the second air interface and transmits the service in the first service set that meets the QoS requirement is sent to the user terminal through the second air interface.
  • the distribution point device finds that the first air interface is unavailable, the downlink data is buffered, and the downlink data is determined to belong to services A, B, and C, respectively. If the services A and C are moved to the second air interface, the transmission cannot meet the maximum delay required by services A and C, and the service B is moved to the second air interface for transmission. To meet the QoS requirements of the service B, the distribution point device deletes the connection context information corresponding to the services A and C, and discards the downlink data of the cached services A and C. At the same time, the distribution point device associates the connection context information corresponding to the service B. The transmission is changed from being transmitted through the first air interface to being transmitted through the second air interface, and the downlink data of the buffered service B is sent to the UE through the second air interface.
  • the service that the UE interacts with the network on the first air interface may have other services in addition to the services corresponding to the buffered downlink data.
  • the method 300 can also execute S330.
  • connection context information corresponding to the other service is deleted or changed to be transmitted through the second air interface.
  • connection context information For the service originally transmitted on the first air interface, if the connection context information is not processed according to S310 and S320, the connection context information may be deleted or changed according to the preset setting to be transmitted through the second air interface, so that the device is saved at the distribution point device. In the corresponding relationship between the service and the connection context information, the service transmitted through the first air interface is no longer displayed, so that the service on the first air interface that is unavailable is effectively processed, and all service interruptions on the first air interface are avoided as much as possible.
  • the distribution point device can effectively process the service on the first air interface by determining how to update the connection context information according to the quality of service requirement, so as to maintain the continuity of the service as much as possible without adversely affecting the service quality of the service, thereby Efficient use of network resources to avoid wasting network resources in the transmission of services that do not meet the quality of service requirements.
  • connection context information related to the first air interface may also be updated by the method 400 shown in FIG.
  • S410 the downlink data to be sent to the user terminal through the first air interface is buffered. This step is the same as S310.
  • uplink information related to uplink data buffered by the user terminal is obtained.
  • the user terminal may cache the uplink data that is to be sent to the network side through the first air interface.
  • the UE may restore the data packet that has been packaged to be sent through the first air interface to the original IP data packet, and push the IP data packet into the temporary cache. If the UE still retains the original IP data packet and is ready to be packaged to be transmitted through the first air interface, the UE directly pushes these original IP data packets into the temporary cache. If the UE newly generates data to be sent through the first air interface, the processing is stopped first. After the user terminal buffers the uplink data, the uplink information related to the uplink data may be notified to the distribution point device.
  • the uplink information can help the distribution point device determine whether the service to which the uplink data belongs can be moved to the second air interface for transmission.
  • the uplink information related to the uplink data may include, but is not limited to, at least one of the following: how long the UE caches the uplink data, the service to which the uplink data belongs, the data volume of the uplink data, and the service corresponding to the uplink data.
  • the connection context information, whether the service to which the uplink data determined by the UE belongs can be moved to the determination result transmitted on the second air interface.
  • connection context information corresponding to the first service set to which the downlink data belongs and the service in the second service set based on the uplink information is updated.
  • the service that the cached uplink data belongs to may be determined by referring to the uplink information.
  • the uplink data buffered by the UE may belong to different services, and the set of services to which the uplink data belongs is referred to as a second service set, and at least one service is included in the second service set.
  • the set of services to which the downlink data belongs is referred to as a first service set, and at least one service is concentrated in the first service.
  • the first service set and the second service set may or may not overlap at all; the first service set and the second service set may include all services that interact with the UE through the first air interface switch point device, or may be A subset of all services that the distribution point device interacts with the UE.
  • the distribution point device After the distribution point device determines the first service set and the second service set, the corresponding connection context information may be updated, so that the first service set and the second service set that are originally transmitted on the first air interface do not pass the first Air interface transmission.
  • the distribution point device can determine whether the service can be moved to the second air interface for transmission by referring to the QoS requirement of the service. For example, the distribution point device may update the connection context information corresponding to the services in the first service set and the second service set in a manner of S432 to S437.
  • the service B represents any of the services in the second service.
  • the traffic distribution device can determine whether the transmission of the service B to the second air interface is satisfied according to the uplink information.
  • the distribution point device may determine that the UE caches the uplink data of the service B and how long it takes in the caching process. The distribution point device needs this time and the moving service B. The sum of the time spent is the delay introduced by the service B through the second air interface. If the delay exceeds the maximum delay required by service B, then moving service B to the second air interface does not satisfy the QoS requirement.
  • the distribution point device determines the uplink data of the buffer service B, and if the transmission of the service B to the first air interface takes 1 second, then the QoS requirement of the service B is 2 In the second, the distribution point device determines that the service B is moved to the second air interface and the transmission will not meet the QoS requirement.
  • the QoS requirement of the service B is 5 seconds, the distribution point device determines to move the service B to the second air interface to transmit the QoS. Claim.
  • the distribution point device can determine how much data the UE has the uplink data of the service B and the uplink data of the service B. With this amount of data, the distribution point device can calculate how much bandwidth will be allocated if the uplink data is transmitted through the second air interface within a predetermined time.
  • the bandwidth calculated by the distribution point device is smaller than the throughput required by the service B, the distribution point device determines that the transmission of the service B to the second air interface will not satisfy the QoS requirement; when the bandwidth calculated by the distribution point device is greater than or equal to the service B
  • the distribution point device determines to move the service B to the second air interface to transmit the QoS requirements.
  • connection context information corresponding to the service in the first service set and the second service set that does not satisfy the QoS requirement is deleted and moved to the second air interface.
  • connection context information corresponding to the service of the first service set and the second service set that meets the QoS requirement is transmitted to the second air interface, and is changed from being transmitted through the first air interface to being transmitted through the second air interface.
  • the following results can be achieved by executing S436 and S437: If a service belongs to both the first service set and the second service set, then when it is determined in S432 and S434 that the service is moved to the second air interface and the transmission meets the QoS requirement, The connection context information corresponding to the service is changed from being transmitted through the first air interface to being transmitted through the second air interface, otherwise the connection context information corresponding to the service is deleted; if one service belongs to the first service set and the second service set Set, then according to the determination result in S432 or S434, it can be determined whether the connection context information is deleted or the connection context information is changed.
  • S434 is executed after S432
  • the order of execution of S434 and S432 is not limited as long as S434 and S432 are executed before S436 and S437.
  • S437 is executed after S436, the order of execution of S437 and S436 is not limited as long as S436 and S437 are executed after S434 and S432.
  • the service on the first air interface can be effectively processed by using the QoS requirements to update the downlink data buffered by the traffic distribution device and the connection context information of the service corresponding to the uplink data cached by the UE, so as to maintain the continuity of the service, but not the service.
  • the quality of service has an adverse effect, so that network resources can be utilized more effectively, and network resources are avoided from being transmitted in services that do not meet QoS requirements.
  • the traffic distribution device may further process the buffered downlink data according to the updated result.
  • the downlink data discarding of the service in the first service set that does not satisfy the QoS requirement is transmitted to the second air interface.
  • the downlink data that is moved to the second air interface and transmits the service in the first service set that meets the QoS requirement is sent to the user terminal through the second air interface.
  • the traffic distribution device finds that the first air interface is unavailable, the downlink data is buffered, and the downlink data is determined to belong to services 8, 8 and (..
  • the traffic point device obtains uplink information from the UE, and determines that the UE caches service A, (and 0)
  • the branch point device determines that if the service A is moved to the second air interface for transmission, the maximum delay required by the service A cannot be satisfied, that is, the QoS requirement of the service A is not satisfied, if If the service B and the service C are moved to the second air interface for transmission, the QoS requirements of the service B and the service C can be satisfied.
  • the time-slot device determines whether the time for the UE to buffer the uplink data indicated by the uplink information reported by the UE, etc. If services A and D are moved to the second air interface for transmission, the QoS requirements of services A and D can be met. If the service C is moved to the second air interface for transmission, the maximum delay required by service C cannot be met. Therefore, the distribution point device The connection context information corresponding to each of the service A and the service C is deleted, and the service B and the service D are respectively corresponding to each other. The context information is changed from being transmitted through the first air interface to being transmitted through the second air interface. And, the traffic distribution device discards the downlink data of the buffered service A and the service C, and sends the downlink data of the buffered service B to the UE through the second air interface. .
  • the service that the UE interacts with the network on the first air interface may have other services in addition to the downlink data buffered by the sink device and the uplink data buffered by the UE.
  • the method 400 can also perform S440.
  • connection context information corresponding to the other services is deleted or changed to be transmitted through the second air interface.
  • connection context information For the service originally transmitted on the first air interface, if the connection context information is not processed, The connection context information may be deleted or changed to be transmitted through the second air interface according to the preset setting, so that the service transmitted through the first air interface does not appear in the correspondence between the service saved by the distribution point device and the connection context information, thereby Effectively deal with services on the first air interface that are not available, and try to avoid all service interruptions on the first air interface.
  • the service By determining whether to move the service to the second air interface according to the QoS requirements of the service, the service can be continued to be transmitted to the second air interface to transmit the service satisfying the QoS requirement, thereby ensuring the continuity of the service and moving to the second.
  • a service interruption service that does not meet the QoS requirement is transmitted on the air interface, thereby eliminating the waste of resources by allocating resources of the second air interface for services that do not meet the QoS requirement.
  • connection point device updates the connection context information on the first air interface
  • the first message needs to be sent to the UE to notify the UE of the updated connection context information, so that the UE can remain the same as the distribution point device.
  • Connection context information
  • the update information carried in the first message may be the updated connection context information itself, for example, the value of the updated connection context information is directly carried in the first message.
  • the update information may also be an input parameter that can be used to derive the connection context information.
  • the first message carries the amount of change of the connection context information, and the UE can derive the updated connection context information by changing the amount.
  • the data transmission may be performed with the UE according to the updated connection context information.
  • connection context information corresponding to the current first air interface
  • data transmission is performed with the UE according to the updated connection context information. Since the distribution point device receives the response of the successful update, the distribution point device may determine that the connection context information of the UE has been successfully updated. At this time, the connection context information of the UE and the distribution point device are consistent, and then the data transmission is performed according to the updated connection context information. , can guarantee the success of data transmission.
  • the traffic point device may update the connection context information corresponding to the service carried by the first air interface and notify the user terminal, so that the traffic point device And the user terminal can continue to perform data transmission based on the same connection context information, so that the service carried by the current first air interface can be processed, which is beneficial to avoid all interruption of the service corresponding to the data transmission performed by the UE through the first air interface, and to ensure the UE service as much as possible. Continuity, which helps to improve the user's communication experience.
  • a flow chart of a method 500 for data transmission in accordance with an embodiment of the present invention is described with reference to FIG. Through S502 and S504 in method 500, the distribution point device can determine that the first air interface is unavailable.
  • a second message generated and sent by the user terminal indicating that the first air interface is unavailable is received.
  • a second message that is generated and sent by the user terminal to indicate that the first air interface is unavailable may be received: when the number of times the data packet is retransmitted to the access device of the first air interface exceeds a predetermined number. The number of times, or when the time when the data packet is retransmitted to the access device exceeds the first predetermined time, or the response returned by the access device in response to the data packet sent by the user terminal is not received within the second predetermined time Time.
  • the description is made by taking the case that the UE finds that the WiFi air interface is unavailable.
  • the present invention is not limited to the WiFi air port being unavailable, and may be another air interface whose unreliable air interface or reliability function is weakened.
  • the RTS/CTS mechanism When the UE transmits uplink data through the WiFi link, when the transmitted data packet is larger than a certain threshold, the RTS (Request to Send)/CTS (Clear to Send) mechanism can be enabled.
  • the UE may first send an RTS message to an access point (AP). If the UE receives the CTS message returned by the AP, the UE may start to send the data packet, and if the AP successfully decodes the received data, The packet returns an Acknowledge (ACK) message to the UE.
  • the AP is an access device for the WiFi air interface.
  • the UE When the UE sends an RTS message to the AP, the UE does not receive the CTS message within the second predetermined time due to network congestion or other reasons, then the UE determines that the WiFi uplink is unavailable, so that the WiFi air interface is unavailable. During the second predetermined time, the UE may retransmit the RTS message to the AP multiple times.
  • the UE When the UE receives the CTS message and starts to send the data packet, if the UE does not receive the ACK message returned by the AP, the UE retransmits the data packet until receiving the ACK message returned by the AP. However, if the number of retransmissions of the data packet by the UE exceeds a predetermined number of times, for example, 7 times, the UE judges that the WiFi uplink is unavailable, so that the WiFi air interface is unavailable.
  • the UE When the UE receives the CTS message and starts to send the data packet, if the UE retransmits the data packet for more than the first predetermined time, but has not received the ACK message returned by the AP, the UE determines that the WiFi uplink is unavailable, thereby WiFi air port is not available.
  • the UE may also directly send the data packet to the AP.
  • the UE may also directly send the data packet to the AP.
  • the data packet is retransmitted until the ACK message returned by the AP is received.
  • the UE retransmits the packet to the AP The number of times exceeds the predetermined number of times, but the response returned by the AP has not been received, and the UE determines that the WiFi uplink is unavailable.
  • the UE determines that the WiFi uplink is unavailable. If the UE does not receive a response returned by the AP within a second predetermined time after transmitting the data packet to the AP, the UE determines that the WiFi uplink is unavailable.
  • the user terminal may periodically generate and send a data packet for detecting the availability of the first air interface to the access device of the first air interface.
  • the UE may periodically generate and send a data packet for detecting the availability of the WiFi air interface to the AP. Since the data packet does not need to carry uplink data, the data packet for detecting the availability of the WiFi air interface is also simply referred to as a small data packet.
  • the UE determines whether the WiFi uplink is available by periodically generating small packets.
  • the small data packet can be randomly generated, and its function is to detect the availability of the WiFi link, which has nothing to do with data transmission.
  • the UE when the UE is ready to send small data packets to the AP, the UE first sends an RTS message to the AP, and then sends a small data packet after receiving the CTS message.
  • the small data packet can also be configured in the form of direct transmission.
  • the UE wants to detect the availability of the WiFi uplink, it directly sends a small data packet to the AP to see whether it can receive the ACK message returned by the AP.
  • the RTS required to send a small packet or the small packet sent directly can be sent for a longer period of time, so that it does not conflict with the WLAN retransmission mechanism.
  • the UE may not perform any buffering.
  • the UE directly generates small data packets and sends the small data packets without buffering, so that the storage space is not wasted.
  • the UE may determine that the WiFi uplink is unavailable, so that the WiFi air interface is unavailable.
  • a second message that is generated and sent by the access device that receives the first air interface and indicates that the first air interface is unavailable is used.
  • the access device that receives the first air interface may generate and send a second message indicating that the first air interface is unavailable in one of the following situations: when the number of times the data packet is retransmitted to the user terminal exceeds a predetermined number When the number of times, or when the data packet is resent to the user terminal exceeds the first pre- At a fixed time, or when the response returned by the user terminal in response to the data packet transmitted by the access device is not received within the second predetermined time.
  • the AP finds that the WiFi air interface is unavailable.
  • the present invention is not limited to the WiFi air interface being unavailable, and may be another air interface whose unreliable air interface or reliability function is weakened.
  • the AP may first send an RTS message to the UE when the RTS/CTS mechanism is used. If the AP receives the CTS message returned by the UE, the AP may start to send the data packet. If the received packet is successfully decoded, an ACK message is returned to the AP.
  • the AP When the AP sends an RTS message to the UE, the AP does not receive the CTS message within the second predetermined time due to network congestion or other reasons, and the AP determines that the WiFi downlink is unavailable, so that the WiFi airspace is unavailable. During the second predetermined time, the AP may resend the RTS message to the UE multiple times.
  • the AP When the AP receives the CTS message and starts to send the data packet, if the AP does not receive the ACK message returned by the UE, the AP retransmits the data packet until receiving the ACK message returned by the UE. However, if the number of retransmissions of the data packet by the AP exceeds a predetermined number of times, for example, 7 times, the AP determines that the WiFi downlink is unavailable, so that the WiFi air interface is unavailable.
  • the AP When the AP receives the CTS message and starts to send the data packet, if the AP retransmits the data packet for more than the first predetermined time, but has not received the ACK message returned by the UE, the AP determines that the WiFi downlink is unavailable. WiFi air port is not available.
  • the AP may also directly send a data packet to the UE. After the AP sends a data packet to the UE, if the AP does not receive the ACK message returned by the UE, the AP retransmits the data packet until receiving the ACK message returned by the UE. However, if the AP retransmits the data packet to the UE more than a predetermined number of times but has not received the response returned by the UE, the AP determines that the WiFi downlink link is unavailable.
  • the AP determines that the WiFi downlink is unavailable. If the AP does not receive a response returned by the UE within a second predetermined time after transmitting the data packet to the UE, the AP determines that the WiFi downlink is unavailable.
  • the access device of the first air interface may periodically generate and send a data packet for detecting the availability of the first air interface to the user terminal.
  • the AP may periodically generate and send a data packet for detecting the availability of the WiFi air interface to the UE.
  • This packet does not need to carry downstream data, so It can also be referred to simply as a small data packet.
  • the AP determines whether the WiFi downlink is available by periodically generating small data packets.
  • the small data packet can be randomly generated, and its function is to detect the availability of the WiFi link, which has nothing to do with data transmission.
  • the AP when the AP is ready to send a small data packet to the UE, the AP first sends an RTS message to the UE, and then sends the small data packet after receiving the CTS message.
  • the small data packet can also be configured in the form of direct transmission.
  • the AP wants to detect the availability of the WiFi downlink, the AP directly sends a small data packet to the UE to see whether it can receive the ACK message returned by the UE.
  • the RTS required to send a small packet or the small packet sent directly can be sent for a longer period of time, so that it does not conflict with the WLAN retransmission mechanism.
  • the AP may not perform any buffering.
  • the AP directly generates small data packets and sends the small data packets without buffering, so that no storage space is wasted.
  • the AP may determine that the WiFi downlink is unavailable, so that the WiFi air interface is unavailable.
  • the second message received in S502 may be application layer signaling, indicating that the data packet carries application layer signaling by carrying a predetermined identifier in a header of the data packet.
  • the application layer signaling can be used to change the existing signaling structure, so that the message indicating that the air interface is unavailable can be easily introduced into the existing system, which is convenient to implement.
  • the distribution point device may determine that the first air interface is unavailable.
  • S510, S520, and S530 are the same as S110, S120, and S130. To avoid repetition, details are not described herein.
  • Application layer signaling for indicating that the first air interface is unavailable may have the form as shown in FIGS. 8 and 9.
  • the application layer signaling can also convey other information.
  • FIG. 8 and FIG. 9 application layer signaling is encapsulated in a data packet, and by setting a predetermined identifier at the head of the data packet, it can be indicated that the data packet carries application layer signaling.
  • the predetermined identifier may be any character or string that is pre-set to send and receive double-consistent, and the character or string does not conflict with existing standards.
  • the data packet is carried by carrying a predetermined IP address in the header of the data packet.
  • the primary RAT is an access technology of the LTE
  • the secondary RAT is an access technology of the WLAN. Therefore, the second air interface is an LTE air interface, and the first air interface is a WiFi air interface.
  • the UE has an LTE protocol stack and a WLAN protocol stack.
  • the UE's WLAN protocol stack is peered with the AP's WLAN protocol stack.
  • the Ethernet protocol stack of the AP is peered with the Ethernet protocol stack of the S-GW of the distribution point device.
  • the LTE protocol stack of the UE is converted by the protocol stack in the base station, and can communicate with the protocol stack of the LTE S1 user plane of the S-GW.
  • the primary RAT is the UMTS access technology
  • the secondary RAT is the WLAN access technology. Therefore, the second air interface is a UMTS air interface, and the first air interface is a WiFi air interface.
  • the UE has a UMTS protocol stack and a WLAN protocol stack.
  • the UE's WLAN protocol stack is peered with the AP's WLAN protocol stack.
  • the Ethernet protocol stack of the AP is peered with the Ethernet protocol stack of the RNC.
  • the UE's UMTS protocol stack is translated by the protocol stack in the base station and can communicate with the RNC's UMTS protocol stack.
  • the UE can notify the power distribution point device that the WiFi air interface is unavailable by using the application layer signaling in the LTE protocol stack or the application layer signaling in the UMTS protocol stack.
  • the encapsulation format of Figure 8 shows the application layer signaling packet format for the UE communicated between the AP and the distribution point device RNC/S-GW.
  • the application layer signaling data packet between the AP and the branch point device RNC/S-GW includes an IP header, a TCP (Transmission Control Protocol), and a SCTP (Stream Control Transmission Protocol). Transport Protocol) Header, Tunnel Layer Header, and Application Layer Signaling Load.
  • the tunnel layer header includes an IP header and a TCP/UDP (User Datagram Protocol) header, and the information that the first air interface is unavailable is carried in the application layer signaling load.
  • the source IP address field carries the IP address of the AP
  • the destination IP address field carries the IP address of the RNC/S-GW.
  • the UE is distinguished by the source port field.
  • the source IP address field carries the IP address of the UE
  • the destination IP address field carries the predetermined IP address
  • the predetermined IP address indicates that the data packet carries the application layer signaling.
  • the AP When the AP receives application layer signaling from the distribution point device, in the IP header, in the source IP address field The IP address of the RNC/S-GW of the distribution point device is carried, and the IP address of the AP is carried in the destination IP address field.
  • the UE In the TCP/SCTP header, the UE is distinguished by the destination port.
  • the source IP address field In the IP header of the tunnel layer, the source IP address field carries a predetermined IP address, and the predetermined IP address indicates that the data packet carries application layer signaling, and the destination IP address field carries the IP address of the UE.
  • the encapsulation format of Figure 9 shows the application layer signaling packet format for the UE communicated between the AP and the UE.
  • the application layer signaling data packet between the AP and the UE includes a MAC header, a tunnel layer header, and an application layer signaling payload.
  • the tunnel layer header includes an IP header and a TCP/UDP header, and the information that the first air interface is unavailable is carried in the application layer signaling load.
  • the source MAC address field carries the MAC address of the AP
  • the destination MAC address field carries the MAC address of the UE.
  • the source IP address field carries a predetermined IP address, which is used to indicate that the data packet carries application layer signaling
  • the destination IP address field carries the IP address of the UE.
  • the source IP address field carries the MAC address of the UE
  • the destination IP address field carries the MAC address of the AP.
  • the source IP address field carries the IP address of the UE
  • the destination IP address field carries a predetermined IP address, which is used to indicate that the data packet carries application layer signaling.
  • Application layer signaling can be used not only to indicate that the first air interface is unavailable, but also to transmit other control information.
  • application layer signaling By using application layer signaling, the existing signaling structure is not affected, and the implementation is convenient, and the scalability of the system can be improved.
  • the method for data transmission according to an embodiment of the present invention is described above from the network side, and the method 1000 and method 1100 for user data transmission according to an embodiment of the present invention are described below from the user side.
  • method 1000 includes:
  • the first message sent by the power distribution point device is received, where the first message carries a connection corresponding to the service of the user terminal that is updated on the first air interface when the first air interface is unavailable.
  • Context information related update information where the user terminal is connected to the core network through the first access network through the first air interface;
  • connection context information corresponding to the service on the first air interface is updated
  • method 1000 can be performed by a user terminal.
  • the UE is simultaneously connected to the core network through the second air interface and the first air interface, and the data distribution transmission is provided by the power distribution point device for the UE.
  • the traffic distribution device may send a first message to the UE, so that the UE updates the connection context information related to the service originally transmitted on the first air interface, so that the problem that the first air interface is unavailable may be processed. Since the operation of the UE corresponds to the operation of the distribution point device, in order to avoid duplication, the operation of the UE may refer to the corresponding description in the above methods 100, 300, 400 to 500.
  • the user terminal may update the connection context information corresponding to the service carried by the first air interface according to the first message sent by the traffic distribution device.
  • the traffic distribution device and the user terminal can continue to perform data transmission based on the same connection context information, so that the service carried by the current first air interface can be processed, which is beneficial to avoid all interruption of the service corresponding to the data transmission performed by the UE through the first air interface.
  • the continuity of the UE service is beneficial to improve the communication experience of the user.
  • FIG. 11 is a flow diagram of another method 1100 for data transmission in accordance with an embodiment of the present invention.
  • S1102 a second message indicating that the first air interface is unavailable is sent to the distribution point device.
  • the UE may send a second message to the distribution point device in a plurality of cases where it detects that the first air interface is unavailable. For example, when the number of times the data packet is retransmitted to the access device of the first air interface exceeds the predetermined number of times, or when the time for retransmitting the data packet to the access device exceeds the first predetermined time, or when at the second predetermined time There is no response received from the access device.
  • the above can refer to the description in S502.
  • the second message may be application layer signaling, indicating that the data packet carries application layer signaling by carrying a predetermined identifier in a header of the data packet.
  • application layer signaling can use the encapsulation format shown in Figure 9. By using application layer signaling, it does not affect the existing signaling structure and is easy to implement.
  • the UE may buffer the uplink data that is currently to be sent through the first air interface, and wait for the control of the traffic point device to process the uplink data.
  • uplink information related to the uplink data is transmitted to the branch point device, so that the branch point device updates the connection context information according to the uplink information.
  • the uplink information may be sent to the distribution point device, and the uplink information may be used to help the distribution point device determine whether the service related to the uplink data is deleted or moved to the second air interface. Transfer.
  • the uplink information sent by the UE may include the time taken to buffer the uplink data, the service to which the uplink data belongs, the data amount of the uplink data, the QoS requirement of the uplink data, and the connection context information corresponding to the uplink data. The above can refer to the description in S420.
  • the first message sent by the distribution point device is received, and the first message carries update information related to the connection context information corresponding to the service of the user terminal on the first air interface that is updated when the first air interface is unavailable.
  • the update information carried in the first message may be determined by the distribution point device according to the uplink data reported by the UE.
  • the update information may be used to instruct the UE to update the connection context information of the service originally transmitted on the first air interface.
  • connection context information indicated by the update information indicates that there is uplink data of the service in which the connection context information is deleted in the uplink data
  • the uplink data is discarded; or, the connection context information indicated by the update information indicates that the uplink data exists.
  • the connection context information is changed to the uplink data of the service transmitted through the second air interface
  • the uplink data is sent to the distribution point device through the second air interface.
  • the UE processes the uplink data buffered in S1104 according to the updated connection context information.
  • S1115 can be executed after S1110, and has no relationship with the execution order of S1120 and S1130.
  • connection context information corresponding to the service on the first air interface is updated.
  • the UE After receiving the first message sent by the distribution point device, the UE updates the connection context information according to the update information, because the update information carried by the first message indicates how to update the connection context information. For example, when the update information indicates that the connection context information of the service A is deleted, the UE deletes the connection context information of the service A. For another example, when the update information indicates that the connection context information of the service B is modified to be transmitted through the second air interface, the UE will modify the connection context information of the service B accordingly.
  • the UE After the UE updates the connection context information, it performs subsequent data transmission with the distribution point device according to the updated connection context information.
  • the user terminal helps the distribution point device to update the connection context information by buffering the uplink data and reporting the uplink information, which is beneficial to the branch point device to more comprehensively consider how to update the connection context information. , which can improve the connection up and down The validity of the text information update, the continuity of the service that meets the quality of service requirements, and the interruption of services that do not meet the service quality requirements continue to provide services, thereby saving network resources.
  • FIG. 12 is a block diagram showing the structure of a power distribution point device 1200 according to an embodiment of the present invention.
  • the distribution point device 1200 may be a network device such as an RNC, an S-GW, a GGSN, an SGSN, or a P-GW.
  • the distribution point device 1200 can include an update module 1210, a transmission module 1220, and a transmission module 1230, wherein the update module 1210 can be implemented by a processor, the transmission module 1220 can be implemented by a transmission interface, and the transmission module 1230 can be implemented by a transceiver interface.
  • the update module 1210 is configured to update the connection context information corresponding to the service of the user terminal on the first air interface when the first air interface is unavailable, wherein the user terminal is connected to the core network through the first access network through the first air interface.
  • the sending module 1220 is configured to send a first message to the user terminal, where the first message carries update information related to the updated connection context information, and is used to enable the user terminal to correspond to the current service on the first air interface according to the update information.
  • the connection context information is updated to obtain the updated connection context information.
  • the transmission module 1230 is operable to perform data transmission based on the updated connection context information and the user terminal.
  • the distribution point device may update the connection context information corresponding to the service carried by the first air interface and notify the user terminal when the first air interface is unavailable, so that the distribution point device and the user terminal may be based on the same
  • the connection context information continues to be transmitted, so that the service carried by the first air interface can be processed, which is beneficial to avoid the interruption of the service corresponding to the data transmission performed by the UE through the first air interface, thereby ensuring the continuity of the UE service, thereby facilitating the continuity of the UE service.
  • FIG. 13 is a block diagram showing the structure of a power distribution point device 1300 according to an embodiment of the present invention.
  • the update module 1310, the transmission module 1320, and the transmission module 1330 of the distribution point device 1300 are substantially the same as the update module 1210, the transmission module 1220, and the transmission module 1230 of the distribution point device 1200.
  • the update module 1310 includes a cache unit 1312 and a first update unit 1314.
  • the buffer unit 1312 can be configured to buffer the downlink data to be sent to the user terminal through the first air interface.
  • the first update unit 1314 is configured to update connection context information corresponding to the service in the first service set to which the downlink data belongs.
  • the user terminal is connected through the first access network through the first air interface.
  • the second air interface can also be connected to the core network via the second access network.
  • the update module 1310 may further include a second update unit
  • the second update unit 1316 is configured to delete or change the connection context information corresponding to the other service to be transmitted through the second air interface if there is another service of the user terminal other than the service in the first service set on the first air interface.
  • the first update unit 1314 may include a determination subunit
  • the determining subunit 1314-2 is configured to determine whether the transmission of the traffic in the first service set to the second air interface is satisfied according to the downlink information related to the downlink data.
  • the deletion sub-unit 1314-4 can be used to delete the connection context information corresponding to the service in the first service set that does not satisfy the QoS requirement by moving to the second air interface.
  • the change subunit 1314-6 can be used to transfer the connection context information corresponding to the service in the first service set that meets the QoS requirement to be moved to the second air interface, and change from the first air interface transmission to the second air interface transmission.
  • the update module 1310 may further include a discarding unit 1318 and/or a transmitting unit 1319.
  • the discarding unit 1318 can be configured to move the downlink data to the second air interface to transmit downlink data of the service in the first service set that does not meet the QoS requirement.
  • the sending unit 1319 is configured to send the downlink data that is transported to the second air interface and transmit the service in the first service set that meets the QoS requirement to the user terminal by using the second air interface.
  • the distribution point device 1300 may further include a receiving module 1302 and a determining module 1304.
  • the receiving module 1302 is configured to receive a second message that is generated and sent by the user terminal, indicating that the first air interface is unavailable, or a second message that is generated and sent by the access device that receives the first air interface and that indicates that the first air interface is unavailable.
  • the determining module 1304 is configured to determine, according to the second message, that the first air interface is unavailable.
  • the receiving module 1302 is configured to receive, by the user terminal, a second message that is generated and sent by the user terminal, indicating that the first air interface is unavailable. : when the number of times of resending the data packet to the access device of the first air interface exceeds the predetermined number of times, or when the time for resending the data packet to the access device exceeds the first predetermined time, or when in the second predetermined time The response returned by the access device in response to the data packet sent by the user terminal is not received.
  • the data packet sent by the user equipment may be periodically generated by the user equipment and sent to the access device of the first air interface for detecting the availability of the first air interface. Sexual data packets.
  • the access device that is used by the receiving module 1302 to receive the first air interface is generated and sent in the case of one of the following: a second message indicating that the first air interface is unavailable: when the number of times the data packet is retransmitted to the user terminal exceeds a predetermined number of times, or when the time for resending the data packet to the user terminal exceeds the first predetermined time, or when When the response returned by the user terminal in response to the data packet sent by the access device is not received within the second predetermined time.
  • the data packet sent by the access device of the first air interface may be a data packet periodically generated by the access device and sent to the user terminal for detecting the availability of the first air interface.
  • the second message received by the receiving module 1302 may be application layer signaling, which indicates that the data packet carries application layer signaling by carrying a predetermined identifier in the header of the data packet.
  • the above and other operations and/or functions of module 1304 can be referred to in the descriptions of methods 100, 300, and 500. To avoid repetition, details are not described herein.
  • the traffic distribution point device by determining how to update the connection context information of the service corresponding to the downlink data buffered by the distribution point device according to the quality of service requirement, the service on the first air interface can be effectively processed, and the continuity of the service is maintained as much as possible. Sexuality, but does not adversely affect the service quality of the service, so that network resources can be utilized more effectively, and network resources are avoided from being transmitted in services that do not meet the quality of service requirements.
  • Figure 14 is a block diagram showing the structure of a power distribution point device 1400 according to an embodiment of the present invention.
  • the update module 1410, the transmission module 1420, and the transmission module 1430 of the distribution point device 1400 are substantially the same as the update module 1210, the transmission module 1220, and the transmission module 1230 of the distribution point device 1200.
  • the update module 1410 may include a cache unit 1412, an acquisition unit 1414, and a first update unit 1416.
  • the buffer unit 1412 can be configured to buffer downlink data to be sent to the user terminal through the first air interface.
  • the obtaining unit 1414 is configured to obtain uplink information related to uplink data buffered by the user terminal.
  • the first update unit 1416 is configured to update connection context information corresponding to the first service set to which the downlink data belongs and the service in the second service set based on the uplink information.
  • the user terminal may be connected to the core network through the second access network through the second air interface, in addition to being connected to the core network via the first air interface.
  • the update module 1410 may further include a second update unit 1417.
  • the second update unit 1417 is configured to: if there is another service on the first air interface of the user terminal other than the first service set and the second service set, the connection context information corresponding to the other service is used. Delete or change to transfer through the second air interface.
  • the first update module 1416 may include a first determining subunit 1416-2, a second determining subunit 1416-4, a deleting subunit 1416-6, and a changing subunit 1416-8.
  • the first determining sub-unit 1416-2 is configured to determine, according to the downlink information related to the downlink data, whether the transmission of the service in the first service set to the second air interface satisfies the QoS requirement.
  • the second determining sub-unit 1416-4 is configured to determine, according to the uplink information, that the service in the second service set is moved to the second air interface, and whether the transmission meets the QoS requirement.
  • the deletion sub-unit 1416-6 can be used to move the connection to the second air interface to delete the connection context information corresponding to the service in the first service set and the second service set that do not meet the QoS requirement.
  • the change subunit 1416-8 can be used to transfer the connection context information corresponding to the service of the first service set and the second service set that meet the QoS requirement to be moved to the second air interface, and change from the first air interface transmission to the second air interface transmission.
  • Update module 1410 may also include a discarding unit 1418 and/or a transmitting unit 1419, in accordance with an embodiment of the present invention.
  • the discarding unit 1418 can be configured to move the downlink data to the second air interface to transmit downlink data of the service in the first service set that does not meet the QoS requirement.
  • the sending unit 1419 is configured to send the downlink data that is transported to the second air interface and transmit the service in the first service set that meets the QoS requirement to the user terminal by using the second air interface.
  • the above and other operations and/or functions of the discarding unit 1418 and the transmitting unit 1419 can be referred to the description in the above method 400. To avoid repetition, details are not described herein again.
  • the distribution point device by determining how to update the downlink data buffered by the distribution point device and the connection context information of the service corresponding to the uplink data buffered by the user terminal according to the quality of service requirement, the first air interface can be effectively processed.
  • the service tries to maintain the continuity of the service, but does not adversely affect the service quality of the service, so that the network resources can be utilized more effectively, and the network resources are avoided from being transmitted in the service that does not meet the service quality requirements.
  • Figure 15 is a block diagram showing the structure of a user terminal 1500 according to an embodiment of the present invention.
  • the user terminal 1500 can be a device such as a cell phone, a personal computer, a digital assistant, or the like.
  • User terminal 1500 The receiving module 1510, the updating module 1520, and the transmitting module 1530 may be included.
  • the receiving module 1510 may be implemented by a receiving interface
  • the updating module 1520 may be implemented by a processor
  • the transmitting module 1530 may be implemented by a transceiver interface.
  • the receiving module 1510 is configured to receive, when the first air interface is unavailable, the first message sent by the power distribution point device, where the first message carries a service corresponding to the service of the user terminal that is updated on the first air interface when the first air interface is unavailable.
  • the update information related to the context information is connected, wherein the user terminal is connected to the core network via the first access network through the first air interface.
  • the update module 1520 is configured to update the connection context information currently corresponding to the service on the first air interface according to the update information.
  • the transmission module 1530 is configured to perform data transmission with the distribution point device according to the updated connection context information.
  • the user terminal when the first air interface is found to be unavailable, may update the connection context information corresponding to the service carried by the first air interface according to the first message sent by the distribution point device, such that the distribution point device and the user terminal
  • the data transmission can be continued based on the same connection context information, so that the service carried by the current first air interface can be processed, which is beneficial to avoid the interruption of the service corresponding to the data transmission performed by the UE through the first air interface, and the continuity of the UE service is ensured as much as possible. Thereby, it is beneficial to improve the communication experience of the user.
  • Figure 16 is a block diagram showing the structure of a user terminal 1600 according to an embodiment of the present invention.
  • the receiving module 1610, the updating module 1620, and the transmitting module 1630 of the user terminal 1600 are substantially the same as the receiving module 1510, the updating module 1520, and the transmitting module 1530 of the user terminal 1500.
  • User terminal 1600 may also include a first transmitting module 1602, in accordance with an embodiment of the present invention.
  • the first sending module 1602 is configured to: when the number of times the data packet is retransmitted to the access device of the first air interface exceeds a predetermined number of times, send a second message indicating that the first air interface is unavailable to the power distribution point device; or, when accessing the access device When the time when the data packet is retransmitted exceeds the first predetermined time, the second message indicating that the first air interface is unavailable is sent to the power distribution point device; or, when the response returned by the access device is not received within the second predetermined time, The distribution point device sends a second message indicating that the first air interface is unavailable.
  • the second message may be application layer signaling, indicating that the data packet carries application layer signaling by carrying a predetermined identifier in a header of the data packet.
  • User terminal 1600 may also include a cache module 1604, in accordance with an embodiment of the present invention.
  • the cache module 1604 can be configured to cache uplink data to be sent to the distribution point device through the first air interface.
  • the user terminal 1600 may further include a second sending module 1606.
  • the second sending module 1606 is configured to send uplink information related to the uplink data to the power distribution point device, so that the power distribution point device updates the connection context information according to the uplink information.
  • the user terminal 1600 may be connected to the core network via the second air interface via the second air interface, in addition to being connected to the core network via the first air interface via the first air interface.
  • User terminal 1600 may also include a discarding module 1640 and/or a third transmitting module 1650, in accordance with an embodiment of the present invention.
  • the discarding module 1640 is configured to discard the uplink data when the connection context information indicated by the update information indicates that there is uplink data of the service in which the connection context information is deleted in the uplink data.
  • the third sending module 1650 is configured to: when the connection context information indicated by the update information indicates that the connection context information is changed to the uplink data of the service transmitted through the second air interface, the uplink data is sent to the distribution point device through the second air interface. send.
  • the foregoing and other operations and/or functions of the first sending module 1602, the buffering module 1604, the second sending module 1606, the discarding module 1640, and the third sending module 1650 may refer to the description in the foregoing method 1100. To avoid repetition, Let me repeat.
  • the user terminal helps the distribution point device to update the connection context information by buffering the uplink data and reporting the uplink information, which is beneficial to the branch point device to more comprehensively consider how to update the connection context information, thereby improving the connection context.
  • the effectiveness of information updates, maintaining the continuity of services that meet the quality of service requirements, and disrupting services that do not meet the quality of service requirements continue to provide services, thereby saving network resources.
  • System 1700 includes a distribution point device 1710 and a user terminal 1720.
  • the distribution point device 1710 is configured to: when the first air interface is unavailable, update connection context information corresponding to the service of the user terminal 1720 on the first air interface, where the user terminal 1720 is connected to the core network through the first access network through the first air interface; The user terminal 1720 sends a first message, the first message carries update information related to the updated connection context information; and the data transmission is performed according to the updated connection context information and the user terminal 1720.
  • the user terminal 1720 is configured to: when the first air interface is unavailable, receive the first message sent by the distribution point device 1710; update the connection context information currently corresponding to the service on the first air interface according to the update information; according to the updated connection context Information and traffic point device 1710 for data transmission Lose.
  • split point device 1710 can be described with reference to the methods 100, 300, 400, and 500 described above, and the above and other operations and/or functions of the user terminal 1720 can be referred to the descriptions of the methods 1000 and 1100 described above. .
  • the traffic point device may update the connection context information corresponding to the service carried by the first air interface and notify the user terminal, so that the power distribution point device And the user terminal can continue to perform data transmission based on the same connection context information, so that the service carried by the current first air interface can be processed, which is beneficial to avoid all interruption of the service corresponding to the data transmission performed by the UE through the first air interface, and to ensure the UE service as much as possible. Continuity, which helps to improve the user's communication experience.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM or technology Any other form of storage medium known.

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Abstract

本发明实施例提供了用于数据传输的方法、分流点设备、用户终端和系统。该方法包括:当第一空口不可用时,更新用户终端在第一空口上的业务对应的连接上下文信息,其中用户终端通过第一空口经由第一接入网连接到核心网;向用户终端发送第一消息,第一消息携带有与更新后的连接上下文信息相关的更新信息,用于使用户终端根据更新信息,对当前与第一空口上的业务对应的连接上下文信息进行更新得到更新后的连接上下文信息;根据更新后的连接上下文信息和用户终端进行数据传输。。根据上述技术方案,有利于避免在第一空口不可用时通过第一空口进行的数据传输所对应的业务全部中断,尽量保证业务的连续性,从而有利于提高用户的通信体验。

Description

用于数据传输的方法、 分流点设备、 用户终端和系统 本申请要求于 2011 年 8 月 26 日提交中国专利局、 申请号为 201110249387.0, 发明名称为 "用于数据传输的方法、 分流点设备、 用户终端 和系统"的中国专利申请优先权, 上述专利的全部内容通过引用结合在本申请 中。 技术领域
本发明涉及通信领域, 并且更具体地, 涉及通信领域中用于数据传输的 方法、 分流点设备、 用户终端和系统。 背景技术
随着无线通信技术的发展, 诸如 GSM ( Global System of Mobile Communication, 全球移动通信系统)、 UMTS ( Universal Mobile Telecommunications System,通用移动通信系统)、I TE(Long Term Evolution, 长期演进)、 LTE-A ( Long Term Evolution-Advanced, 高级长期演进) 之类 的各种制式在各自发展的过程中也在互相融合, 特别是在接入网侧, 各种无 线制式正在朝着具有统一 RRM (Radio Resource Management, 无线资源管理) 的方向进行演进。
当多制式无线接入技术(Multiple Radio Access Technology, Multi- RAT) 支持用户终端 (User Equipment, UE) 同时进行多制式数据传输时, 可以提 高用户的吞吐量并提升用户体验。 例如, 在 WiFi 分流技术中, 可以将 WLAN (Wireless Local Area Network,无线局域网)作为 3G(The thrid Generation, 第三代) 核心网的接入网, 这样 UE可以同时通过 WiFi空口和 3G空口进行数 据传输。 在紧耦合方式实现 WiFi分流的情况下, 用户终端与分组网之间交互 的数据既可以通过 3G核心网、 3G接入网和 3G接入网提供的 3G空口进行, 也 可以通过 3G核心网、 WLAN接入网和 WLAN接入网提供的 WiFi空口进行, 还可 以同时通过 3G空口和 WiFi空口进行。 虽然在上述例子中以 WLAN与 3G网络 为例说明了紧耦合方式, 但是本领域技术人员可以想到紧耦合方式也可以出 现在其他网络架构中, 例如 WLAN与 LTE网络。 在现有的 Multi-RAT场景中,如果通过多个空口同时向 UE提供数据传输, 那么当有空口不可用时, 该空口当前承载的业务中断, 造成该空口上数据传 输的失败。 由于缺少在 Multi-RAT情况下对不可用的空口承载的业务的处理 机制, 使得 UE的数据传输受到影响。 发明内容
本发明提供了用于数据传输的方法、 分流点设备、 用户终端和系统, 可 以在 Multi-RAT场景下处理不可用的空口上承载的业务, 从而为数据分流传 输机制提供处理空口故障的机制, 有利于避免 UE通过该空口进行的数据传输 所对应的业务全部中断。
一方面, 本发明提供了一种用于数据传输的方法, 包括: 当第一空口不 可用时, 更新用户终端在所述第一空口上的业务对应的连接上下文信息, 其 中所述用户终端通过所述第一空口经由第一接入网连接到核心网; 向所述用 户终端发送第一消息, 所述第一消息携带有与更新后的连接上下文信息相关 的更新信息, 用于使所述用户终端根据所述更新信息, 对当前与所述第一空 口上的业务对应的连接上下文信息进行更新得到所述更新后的连接上下文信 息; 根据所述更新后的连接上下文信息和所述用户终端进行数据传输。
另一方面, 本发明提供了一种用于数据传输的方法, 包括: 当第一空口 不可用时, 接收分流点设备发送的第一消息, 所述第一消息携带有与所述分 流点设备在所述第一空口不可用时更新的用户终端在所述第一空口上的业务 对应的连接上下文信息相关的更新信息, 其中所述用户终端通过所述第一空 口经由第一接入网连接到核心网; 根据所述更新信息, 对当前与所述第一空 口上的业务对应的连接上下文信息进行更新; 根据更新后的连接上下文信息 与所述分流点设备进行数据传输。
再一方面, 本发明提供了一种分流点设备, 包括: 更新模块, 用于当第 一空口不可用时, 更新用户终端在所述第一空口上的业务对应的连接上下文 信息, 其中所述用户终端通过所述第一空口经由第一接入网连接到核心网; 发送模块, 用于向所述用户终端发送第一消息, 所述第一消息携带有与更新 后的连接上下文信息相关的更新信息, 用于使所述用户终端根据所述更新信 息, 对当前与所述第一空口上的业务对应的连接上下文信息进行更新得到所 述更新后的连接上下文信息; 传输模块, 用于根据所述更新后的连接上下文 信息和所述用户终端进行数据传输。
又一方面, 本发明提供了一种用户终端, 包括: 接收模块, 用于当第一 空口不可用时, 接收分流点设备发送的第一消息, 所述第一消息携带有与所 述分流点设备在所述第一空口不可用时更新的用户终端在所述第一空口上的 业务对应的连接上下文信息相关的更新信息, 其中所述用户终端通过所述第 一空口经由第一接入网连接到核心网; 更新模块, 用于根据所述更新信息, 对当前与所述第一空口上的业务对应的连接上下文信息进行更新; 传输模块, 用于根据更新后的连接上下文信息与所述分流点设备进行数据传输。
又一方面, 本发明提供了一种用于数据传输的系统, 所述系统包括分流 点设备和用户终端。 所述分流点设备, 用于当第一空口不可用时, 更新所述 用户终端在所述第一空口上的业务对应的连接上下文信息, 其中所述用户终 端通过所述第一空口经由第一接入网连接到核心网; 向所述用户终端发送第 一消息, 所述第一消息携带有与更新后的连接上下文信息相关的更新信息; 根据所述更新后的连接上下文信息和所述用户终端进行数据传输。 所述用户 终端, 用于当所述第一空口不可用时, 接收所述分流点设备发送的所述第一 消息; 根据所述更新信息, 对当前与所述第一空口上的业务对应的连接上下 文信息进行更新; 根据更新后的连接上下文信息与所述分流点设备进行数据 传输。
根据上述技术方案, 分流点设备在发现第一空口不可用时, 可以更新第 一空口承载的业务所对应的连接上下文信息并通知给用户终端, 使得分流点 设备和用户终端关于第一空口上的业务的连接上下文信息保持一致, 从而可 以通过相一致的连接上下文信息成功进行数据传输。 这样, 当分流点设备改 变第一空口上的连接上下文信息之后, 分流点设备和用户终端仍然可以具有 同样的连接上下文信息来使数据传输可以继续进行, 从而可以处理当前第一 空口承载的业务, 有利于避免 UE通过第一空口进行的数据传输所对应的业务 全部中断, 尽量保证 UE服务的连续性, 从而有利于提高用户的通信体验。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例中所需要 使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的 一些实施例, 对于本领域技术人员来讲, 在不付出创造性劳动的前提下, 还 可以根据这些附图获得其他的附图。
图 1是根据本发明实施例的用于数据传输的方法的流程图。
图 2是在紧耦合方式下进行数据分流的网络架构的例子。
图 3是根据本发明实施例的更新连接上下文信息的方法的流程图。
图 4是根据本发明实施例的更新连接上下文信息的另一方法的流程图。 图 5是根据本发明实施例的用于数据传输的另一方法的流程图。
图 6是 Multi-RAT场景下的协议栈的第一例子。
图 7是 Multi-RAT场景下的协议栈的第二例子。
图 8是在第一例子和第二例子中的第一空口的接入设备与分流点设备之 间的应用层信令的封装格式的例子。
图 9是在第一例子和第二例子中的第一空口的接入设备与用户终端之间 的应用层信令的封装格式的例子。
图 10是根据本发明实施例的用于数据传输的再一方法的流程图。
图 11是根据本发明实施例的用于数据传输的又一方法的流程图。
图 12是根据本发明实施例的分流点设备的结构框图。
图 13是根据本发明实施例的另一分流点设备的结构框图。
图 14是根据本发明实施例的再一分流点设备的结构框图。
图 15是根据本发明实施例的用户终端的结构框图。
图 16是根据本发明实施例的另一用户终端的结构框图。
图 17是根据本发明实施例的用于数据传输的系统的示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例的技术方案进行清 楚、 完整地描述。 显然, 所描述的实施例是本发明的一部分实施例, 而不是 全部实施例。 基于本发明中的所述实施例, 本领域技术人员在没有做出创造 性劳动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
首先, 结合图 1, 描述根据本发明实施例的用于数据传输的方法 100。 如图 1所示, 方法 100包括: 在 S110中, 当第一空口不可用时, 更新用户终端在第一空口上的业务对 应的连接上下文信息, 其中用户终端通过第一空口经由第一接入网连接到核 心网;
在 S120中, 向用户终端发送第一消息, 第一消息携带有与更新后的连接 上下文信息相关的更新信息, 用于使用户终端根据更新信息, 对当前与第一 空口上的业务对应的连接上下文信息进行更新得到更新后的连接上下文信 息;
在 S130中, 根据更新后的连接上下文信息和用户终端进行数据传输。 例如, 方法 100可以由分流点设备执行。 当 UE通过第二空口和第一空口 发送上行数据时, 上行数据将通过第二空口和第一空口汇聚到分流点设备。 当分组数据网向 UE发送下行数据时, 下行数据在分流点设备处实现数据的分 流, 分流点设备将其它一部分数据通过第二空口向 UE发送, 将另一部分数据 通过第一空口向 UE发送。
在图 2 所示的网络架构的例子中, 无线网络控制器 (Radio Network Controller, RNC) 是分流点设备。
如图 2所示, UE可以通过包括节点 B (Node B) 和 RNC的 UTRAN (UMTS Terrestrial Radio Access Network, UMTS 陆地无线接入网) 接入 3G/UMTS 核心网。 UE还可以通过包括接入点 (Access Point, AP) 的 WLAN接入网接入 3G/UMTS核心网, 其中 IWU ( Interworking Unit, 互通实体) 用于将 AP连接 到 RNC o 在 3G/UMTS核心网中包括 SGSN (Serving GPRS Support Node, GPRS 服务支持节点)和 GGSN (Gateway GPRS Support Node, GPRS网关支持节点)。
UE通过接入 3G/UMTS核心网, 可以进一步接入互联网, 进而接收分组数据服 务。 UE向互联网传输的数据无论是通过 UTRAN提供的 UMTS空口还是通过 WLAN 提供的 WiFi (Fireless Fidelity, 无线保真)空口, 都将到达 RNC, 再由 RNC 将数据传输到 3G/UMTS核心网, 进而使数据到互联网。 互联网向 UE传输的数 据都将经过 3G/UMTS核心网到达 RNC, 再由 RNC对数据进行分流, 既可以通过 UMTS空口向 UE传输,又可以通过 WiFi空口向 UE传输,还可以同时通过 UMTS 空口和 WiFi空口向 UE传输。由此可见,在该网络建构下,分流点设备为 RNC。
除了图 2所示的例子外,分流点设备也可以是 SGSN、GGSN,PDN-GW(Packet Data Network-Gateway, 分组数据网网关)、 S-GW (Serving-Gateway, 服务 网关) 或集成有多种接入制式的基站等, 本发明对分流点设备的具体形式不 作限定。
在 S110中, 当分流点设备发现第一空口不可用时, 由于在分流点设备上 保存有第一空口上承载的业务和连接上下文信息的对应关系, 因此分流点设 备可以通过更新第一空口上的业务所对应的连接上下文信息来对第一空口上 的数据传输进行处理。
第一空口不可用是指对某一用户终端而言, 虽然该用户终端原本可通过 第一空口传输数据, 但由于某些网络故障或网络拥塞等的出现, 使得该用户 终端不能再使用第一空口传输数据, 从而第一空口对于该用户终端不可用。 第一空口不可用可以是指第一空口的上行链路不可用, 也可以是指第一空口 的下行链路不可用, 还可以同时指第一空口的上行链路和下行链路不可用。
业务对应的连接上下文信息用于表征 UE接受该业务的服务所涉及的连接 信息, 通过参考连接上下文信息可以确定该业务的数据通过什么资源传输, 从而可以确定业务的传输路径, 连接上下文信息的改变意味着业务传输路径 的改变。例如,连接上下文可以包括但不限于无线接入承载标识(Radio Access Bearer Identification, RAB ID) 和分组数据网互连网协议 (Packet Data Network Internet Protocol, PDN-IP) 地址中的至少一项, 通过 RAB ID可 以唯一确定在接入网侧分配给 UE的无线资源, 通过 PDN-IP地址可以确定在 核心网侧对业务数据进行路由所占用的资源。
根据本发明的实施例, 在 Multi-RAT场景中, UE同时通过第二空口和第 一空口接入核心网。 第二空口可以是提供可靠无线连接的空口, UE可以总是 驻留在第二空口上并在第二空口上进行传输, 第二空口对应的无线接入制式 可以被称为主 RAT。第一空口是否可以提供可靠无线连接不作限制, 第一空口 对应的无线接入制式可以被称为次 RAT, Multi-RAT并不保证次 RAT与 UE的 链路的可靠性。 不保证次 RAT在数据传输中与 UE之间链路的可靠性可能是由 于次 RAT本身缺乏必要的数据传输链路的可靠性保证,例如 WLAN提供的 WiFi 空口; 还可能是由于在 Multi-RAT设计时由于存在主 RAT数据链路可靠性的 保证, 而在设计中对原本次 RAT 中存在的数据链路可靠性保证进行了弱化, 例如通过信令裁剪的方法将保证可靠性的信令丢弃。
分流点设备通过更新第一空口上与 UE交互的业务对应的连接上下文信 息, 可以对出现问题的第一空口进行处理, 从而可以避免如现有技术那样没 有处理机制而导致业务只能全部中断的问题, 并且可以尽量保证 UE服务的连 续性。
根据本发明的一个实施例, 可以如图 3所示的方法 300来更新第一空口 涉及的连接上下文信息。
在 S310中, 缓存待通过第一空口向用户终端发送的下行数据。
当分流点设备发现第一空口不可用时, 分流点设备将当前准备通过第一 空口向 UE发送的下行数据进行缓存。 缓存下行数据时, 可以将数据重新恢复 为原始 IP数据包, 并将 IP数据包压入临时缓存。
在 S320中, 更新下行数据所属的第一业务集中的业务对应的连接上下文 倍息
分流点设备缓存的下行数据可以属于不同的业务, 将下行数据所属于的 业务构成的集合称为第一业务集, 在该业务集中至少包括一个业务。
分流点设备可以采用 S322至 S326的方式更新第一业务集中业务对应的 连接上下文信息。
在 S322中, 根据与下行数据相关的下行信息, 确定将第一业务集中的业 务搬移到第二空口上传输是否满足服务质量 (Quality of Service, QoS) 要 求。
与 S310中缓存的下行数据相关的下行信息可以有利于分流点设备判断下 行数据所属的业务是否可以搬移到第二空口上进行传输。 下行信息可以由分 流点设备在缓存下行数据的过程中确定。 例如, 下行信息可以包括但不限于 如下至少一项: 分流点设备缓存该下行数据花费了多长时间、 该下行数据所 属的业务、 该下行数据的数据量、 该下行数据要求的 QoS等。
分流点设备基于将下行数据搬移到第二空口的假设, 可以将搬移后达到 的 QoS与下行数据要求的 QoS进行比较, 从而确定搬移到第二空口是否满足 QoS要求。
用业务 A表示第一业务集中的任一业务。 例如, 如果将业务 A的下行数 据从第一空口上传输搬移到第二空口上传输超过了业务 A要求的最大延时, 则将业务 A搬移到第二空口上传输不满足 QoS要求。 超过最大延时可能是由 于分流点设备发现第一空口不可用的延时过大, 还有可能是由于缓存下行数 据至开始处理业务 A的下行数据的延时过大, 也有可能是由于将业务 A的下 行数据从第一空口搬移到第二空口的处理延时过大等。
再例如, 如果将业务 A的下行数据从第一空口上传输搬移到第二空口上 传输不能达到业务 A要求的吞吐量, 则将业务 A搬移到第二空口上传输不满 足 QoS 要求。 不能达到要求的吞吐量可能是由于第二空口的无线资源有限, 也有可能是由于第二空口传输数据的方式的限制。
如果将业务 A的下行数据搬移到第二空口上传输可以达到业务 A的 QoS 要求, 则确定满足 QoS要求。
在 S324中,将搬移到第二空口上传输不满足 QoS要求的第一业务集中的 业务对应的连接上下文信息删除。
第一业务集中的业务原本在第一空口上传输, 由于现在第一空口不可用, 所以需要将第一业务集中的业务搬移到第二空口上传输。 但是, 如果搬移的 话不能满足业务的 QoS要求, 那么对搬移情况下不满足 QoS要求的业务中断 数据传输, 于是将该业务对应的连接上下文信息删除。
在 S326中,将搬移到第二空口上传输满足 QoS要求的第一业务集中的业 务对应的连接上下文信息从通过第一空口传输改变为通过第二空口传输。
如果搬移的话可以满足业务的 QoS要求, 那么不需要对该业务的数据中 断传输。 此时, 可以通过第二空口来传输该业务的数据, 从而可以将该业务 对应的连接上下文信息修改为通过第二空口传输的形式。
虽然 S326在 S324之后执行, 但是 S326也可以在 S324之前执行, 还可 以与 S324同时执行, 其执行顺序对本发明的保护范围没有限制。
更新了下行数据对应的业务的连接上下文信息之后, 还可以根据更新后 的结果对缓存的下行数据进行处理。
在 S328中,将搬移到第二空口上传输不满足 QoS要求的第一业务集中的 业务的下行数据丢弃。
在 S329中,将搬移到第二空口上传输满足 QoS要求的第一业务集中的业 务的下行数据通过第二空口向用户终端发送。
举例来说, 当分流点设备发现第一空口不可用时, 缓存下行数据, 确定 下行数据分别属于业务 A、 B和 C。 如果将业务 A和 C搬移到第二空口上传输 不能满足业务 A和 C要求的最大延时, 而将业务 B搬移到第二空口上传输可 以满足业务 B要求的 QoS,则分流点设备将业务 A和 C对应的连接上下文信息 删除, 并将缓存的业务 A和 C的下行数据丢弃, 同时, 分流点设备将业务 B 对应的连接上下文信息从通过第一空口传输改变为通过第二空口传输, 并将 缓存的业务 B的下行数据通过第二空口向 UE发送。
此外, UE在第一空口上与网络交互的业务除了缓存的下行数据对应的业 务之外, 可能还有其他业务存在。 为了有效解决第一空口上的所有业务, 方 法 300还可以执行 S330。
在 S330中, 如果第一空口上存在除了第一业务集中的业务之外的用户终 端的其他业务, 则将所述其他业务对应的连接上下文信息删除或改变为通过 第二空口传输。
对于原本在第一空口上传输的业务, 如果按照 S310和 S320没有处理其 连接上下文信息, 则可以根据预先设置将这些连接上下文信息删除或改变为 通过第二空口传输, 使得在分流点设备保存的业务与连接上下文信息的对应 关系中, 不再出现通过第一空口传输的业务, 从而可以有效处理不可用的第 一空口上的业务, 尽量避免第一空口上的所有业务中断。 此外, 分流点设备 通过根据服务质量要求来确定如何更新连接上下文信息, 可以有效处理第一 空口上的业务, 以尽量维持业务的连续性、 但又不对业务的服务质量产生不 利影响, 从而可以更有效的利用网络资源, 避免网络资源浪费在传输不符合 服务质量要求的业务上。
根据本发明的一个实施例, 还可以如图 4所示的方法 400来更新第一空 口涉及的连接上下文信息。
在 S410中, 缓存待通过第一空口向用户终端发送的下行数据。 该步骤与 S310相同。
在 S420中, 获取与用户终端缓存的上行数据相关的上行信息。
当用户终端发现第一空口不可用时, 用户终端可以将准备通过第一空口 向网络侧发送的上行数据缓存起来。 在缓存上行数据时, UE可以将已打包成 通过第一空口发送的形式的数据包还原为原始的 IP数据包, 并将 IP数据包 压入临时缓存。 如果 UE还保留有原始 IP数据包、 正准备打包成通过第一空 口发送的形式, 则 UE直接将这些原始 IP数据包压入临时缓存。 如果 UE又新 生成了准备通过第一空口发送的数据, 则先停止处理。 用户终端缓存上行数据之后, 可以将与上行数据有关的上行信息通知给 分流点设备。 上行信息可以帮助分流点设备判断上行数据所属的业务是否可 以搬移到第二空口上进行传输。 与上行数据相关的上行信息可以包括但不限 于如下至少一项: UE缓存该上行数据花费了多长时间、 该上行数据所属的业 务、 该上行数据的数据量、 该上行数据所属的业务对应的连接上下文信息、 UE确定的上行数据所属的业务是否可搬移到第二空口上传输的确定结果。
在 S430中, 更新与下行数据所属的第一业务集和基于上行信息的第二业 务集中的业务对应的连接上下文信息。
分流点设备获取上行信息之后, 可以通过参考上行信息确定 UE缓存的上 行数据所属的业务。 UE缓存的上行数据可以属于不同的业务, 将上行数据所 属的业务构成的集合称为第二业务集, 在该第二业务集中至少包括一个业务。 如 S320所述, 将下行数据所属的业务构成的集合称为第一业务集, 在该第一 业务集中至少一个业务。 第一业务集和第二业务集可能有交集, 也可能完全 不重合; 第一业务集和第二业务集的并集可能包含通过第一空口分流点设备 与 UE交互的所有业务, 也可能是分流点设备与 UE交互的所有业务的子集。
当分流点设备确定了第一业务集和第二业务集之后, 可以更新相应的连 接上下文信息, 使得原本在第一空口上传输的第一业务集和第二业务集中的 业务不再通过第一空口传输。 根据本发明的实施例, 分流点设备可以通过参 考业务的 QoS 要求来确定是否可以将业务搬移到第二空口上传输。 例如, 分 流点设备可以采用 S432至 S437的方式更新第一业务集和第二业务集中的业 务所对应的连接上下文信息。
在 S432中, 根据与下行数据有关的下行信息, 确定将第一业务集中的业 务搬移到第二空口上传输是否满足 QoS要求。 该步骤与 S322相同。
在 S434中, 根据上行信息, 确定将第二业务集中的业务搬移到第二空口 上传输是否满足 QoS要求。
用业务 B表示第二业务中的任一业务。 UE向分流点设备上传了业务 B的 上行信息之后, 分流点设备可以根据上行信息判断将业务 B搬移到第二空口 上传输是否满足 QoS要求。
例如, 根据上行信息, 分流点设备可以确定 UE缓存有业务 B的上行数据 以及在缓存过程中花费了多长时间。 分流点设备将该时间与搬移业务 B还需 花费的时间之和作为业务 B通过第二空口发送引入的延时。 如果该延时超过 业务 B要求的最大延时, 那么将业务 B搬移到第二空口上传输不满足 QoS要 求。 举例来说, 根据上行信息, 分流点设备确定缓存业务 B 的上行数据花费 了 2秒, 而如果将业务 B搬移到第一空口上传输还需要花费 1秒, 那么当业 务 B的 QoS要求为 2秒时, 分流点设备确定将业务 B搬移到第二空口上传输 将不满足 QoS要求, 当业务 B的 QoS要求为 5秒时, 分流点设备确定将业务 B 搬移到第二空口上传输满足 QoS要求。
再例如, 根据上行信息, 分流点设备可以确定 UE缓存有业务 B的上行数 据以及业务 B 的上行数据有多少数据量。 通过该数据量, 分流点设备可以计 算如果通过第二空口在预定时间内发送该上行数据将分配多少带宽。 当分流 点设备计算出的带宽小于业务 B要求的吞吐量时, 分流点设备确定将业务 B 搬移到第二空口上传输将不满足 QoS 要求; 当分流点设备计算出的带宽大于 或等于业务 B要求的吞吐量时, 分流点设备确定将业务 B搬移到第二空口上 传输满足 QoS要求。
在 S436中,将搬移到第二空口上传输不满足 QoS要求的第一业务集和第 二业务集中的业务对应的连接上下文信息删除。
在 S437中,将搬移到第二空口上传输满足 QoS要求的第一业务集和第二 业务集中的业务对应的连接上下文信息从通过第一空口传输改变为通过第二 空口传输。
通过执行 S436和 S437可以实现如下结果: 如果一个业务既属于第一业 务集又属于第二业务集, 那么当在 S432和 S434中都确定将该业务搬移到第 二空口上传输满足 QoS 要求时, 才将该业务对应的连接上下文信息从通过第 一空口传输改变为通过第二空口传输, 否则将该业务对应的连接上下文信息 删除; 如果一个业务属于第一业务集和第二业务集中的一个业务集, 那么根 据 S432或 S434中的确定结果就可以确定是删除连接上下文信息还是改变连 接上下文信息。
虽然 S434在 S432之后执行, 但是 S434和 S432的执行顺序不受限制, 只要 S434和 S432在 S436和 S437之前执行即可。 虽然 S437在 S436之后执 行,但是 S437和 S436的执行顺序不受限制,只要 S436和 S437在 S434和 S432 之后执行即可。 通过根据 QoS要求来确定如何更新分流点设备缓存的下行数据和 UE缓存 的上行数据对应的业务的连接上下文信息, 可以有效处理第一空口上的业务, 尽量维持业务的连续性, 但又不对业务的服务质量产生不利影响, 从而可以 更有效的利用网络资源, 避免网络资源浪费在传输不符合 QoS要求的业务上。
更新了下行数据和上行数据对应的业务的连接上下文信息之后, 分流点 设备还可以根据更新后的结果对缓存的下行数据进行处理。
在 S438中,将搬移到第二空口上传输不满足 QoS要求的第一业务集中的 业务的下行数据丢弃。
在 S439中,将搬移到第二空口上传输满足 QoS要求的第一业务集中的业 务的下行数据通过第二空口向用户终端发送。
举例来说, 当分流点设备发现第一空口不可用时, 缓存下行数据, 确定 下行数据分别属于业务八、 8和(。 分流点设备从 UE获取上行信息, 确定 UE 缓存有业务 A、(和0。分流点设备根据缓存下行数据的过程中花费的时间等, 确定如果将业务 A搬移到第二空口上传输, 则不能满足业务 A要求的最大延 时即不满足业务 A的 QoS要求, 如果将业务 B和业务 C搬移到第二空口上传 输, 则可以满足业务 B和业务 C的 QoS要求。 此外, 分流点设备根据 UE上报 的上行信息指示的 UE缓存上行数据花费的时间等, 确定如果将业务 A和 D搬 移到第二空口上传输, 则可以满足业务 A和 D的 QoS要求, 如果将业务 C搬 移到第二空口上传输则不能满足业务 C要求的最大延时。 因此, 分流点设备 将业务 A和业务 C各自对应的连接上下文信息删除, 将业务 B和业务 D各自 对应的连接上下文信息从通过第一空口传输改变为通过第二空口传输。 并且, 分流点设备将缓存的业务 A和业务 C的下行数据丢弃, 将缓存的业务 B的下 行数据通过第二空口向 UE发送。
此外, UE在第一空口上与网络交互的业务除了分流点设备缓存的下行数 据和 UE缓存的上行数据对应的业务之外, 可能还有其他业务存在。 为了有效 解决第一空口上的所有业务, 方法 400还可以执行 S440。
在 S440中, 如果第一空口上存在除了第一业务集和第二业务集中的业务 之外的用户终端的其他业务, 则将其他业务对应的连接上下文信息删除或改 变为通过第二空口传输。
对于原本在第一空口上传输的业务, 如果连接上下文信息没有得到处理, 则可以根据预先设置将这些连接上下文信息删除或改变为通过第二空口传 输, 使得在分流点设备保存的业务与连接上下文信息的对应关系中, 不再出 现通过第一空口传输的业务, 从而可以有效处理不可用的第一空口上的业务, 尽量避免第一空口上的所有业务中断。
通过根据业务的 QoS要求来确定是否将业务搬移到第二空口上, 可以对 搬移到第二空口上传输满足 QoS 要求的业务继续提供服务, 从而可以保证业 务的连续性, 而对搬移到第二空口上传输不满足 QoS 要求的业务中断服务, 从而可以省去为不满足 QoS 要求的业务分配第二空口的资源而造成资源的浪 费。
返回图 1, 在 S120中, 分流点设备更新了第一空口上的连接上下文信息 之后, 需要向 UE发送第一消息以向 UE通知更新后的连接上下文信息, 这样 UE可以与分流点设备保持相同的连接上下文信息。
第一消息中携带的更新信息可以是更新后的连接上下文信息本身, 例如, 直接在第一消息中携带更新后的连接上下文信息的数值。 更新信息也可以是 能够推导出连接上下文信息所需的输入参数, 例如, 在第一消息中携带连接 上下文信息的改变量, UE通过改变量可以推导出更新后的连接上下文信息。
在 S130中, 分流点设备向 UE发送第一消息之后, 可以根据更新后的连 接上下文信息与 UE进行数据传输。
根据本发明的一个实施例, 如果收到 UE返回的成功将当前第一空口对应 的连接上下文信息进行更新的响应, 则根据更新后的连接上下文信息与 UE进 行数据传输。 由于分流点设备收到了成功更新的响应, 那么分流点设备可以 确定 UE已成功更新连接上下文信息, 此时 UE和分流点设备的连接上下文信 息保持一致, 于是根据更新后的连接上下文信息进行数据传输, 可以保证数 据传输的成功。
根据本发明实施例提供的用于数据传输的方法, 分流点设备在发现第一 空口不可用时, 可以更新第一空口承载的业务所对应的连接上下文信息并通 知给用户终端, 这样, 分流点设备和用户终端可以基于同样的连接上下文信 息继续进行数据传输, 从而可以处理当前第一空口承载的业务, 有利于避免 UE通过第一空口进行的数据传输所对应的业务全部中断,尽量保证 UE服务的 连续性, 从而有利于提高用户的通信体验。 接下来, 参考图 5描述根据本发明实施例的用于数据传输的方法 500的 流程图。通过方法 500中的 S502和 S504, 分流点设备可以确定第一空口不可 用。
在 S502中,接收用户终端生成并发送的指示第一空口不可用的第二消息。 根据本发明的实施例, 可以接收用户终端在如下之一的情形下生成并发 送的指示第一空口不可用的第二消息: 当向第一空口的接入设备重发数据包 的次数超过预定次数时, 或者, 当向接入设备重发数据包的时间超过第一预 定时间时, 或者, 当在第二预定时间内没有收到接入设备响应于用户终端发 送的数据包而返回的响应时。
以 UE发现 WiFi空口不可用为例进行描述,但是本发明并不限于 WiFi空 口不可用, 还可以是其它不可靠空口或者可靠性功能被弱化的空口。
UE通过 WiFi链路进行上行数据发送时, 当发送的数据包大于某个门限 时, 可以启用 RTS (Request to Send, 请求发送) /CTS (Clear to Send, 允 许发送)机制。 在 RTS/CTS机制中, UE可以先向接入点 (Access Point, AP) 发送 RTS消息, 如果 UE收到 AP返回的 CTS消息, 那么 UE可以开始发送数据 包, AP如果成功解码收到的数据包, 则向 UE返回确认 (Acknowledge, ACK) 消息。 其中, AP是 WiFi空口的接入设备。
当 UE向 AP发送 RTS消息时, 由于网络拥塞或其它原因, UE在第二预定 时间内没有收到 CTS消息, 那么 UE判断 WiFi上行链路不可用, 从而 WiFi空 口不可用。 在第二预定时间内, UE可能向 AP重发了多次 RTS消息。
当 UE收到 CTS消息并开始发送数据包时,如果 UE没有收到 AP返回的 ACK 消息, 那么 UE对数据包进行重传直到收到 AP返回的 ACK消息。 但是, 如果 UE对数据包的重传次数超过了预定次数, 例如 7次, 那么 UE判断 WiFi上行 链路不可用, 从而 WiFi空口不可用。
当 UE收到 CTS消息并开始发送数据包时, 如果 UE重传数据包的时间超 过了第一预定时间, 但还没有收到 AP返回的 ACK消息, 于是 UE判断 WiFi上 行链路不可用, 从而 WiFi空口不可用。
此外, 当 UE通过 WiFi链路进行上行数据发送时, UE也可以直接向 AP 发送数据包。 UE向 AP发送数据包之后,如果 UE没有收到 AP返回的 ACK消息, 则重发数据包直到收到 AP返回的 ACK消息。 但是, 如果 UE向 AP重发数据包 的次数超过预定次数, 但仍没有收到 AP返回的响应, 则 UE确定 WiFi上行链 路不可用。 如果 UE重发数据包的时间超过第一预定时间, 但在第一预定时间 内仍没有收到 AP返回的响应, 则 UE确定 WiFi上行链路不可用。 如果 UE向 AP发送数据包之后在第二预定时间内没有收到 AP返回的响应,则 UE确定 WiFi 上行链路不可用。
另外, 根据本发明的一个实施例, 用户终端可以周期性生成并向第一空 口的接入设备发送用于检测第一空口的可用性的数据包。 具体到 WiFi空口的 例子中, 当 UE没有上行数据需要发送时, UE可以周期性生成并向 AP发送用 于检测 WiFi空口的可用性的数据包。 该数据包由于无需携带上行数据, 因此 在下文中也将用于检测 WiFi空口的可用性的数据包简称为小数据包。 UE通过 周期性生成小数据包来判断 WiFi上行链路是否可用。 该小数据包可以随机生 成, 其作用是检测 WiFi链路的可用性, 与数据传输没有关系。
例如, 如果对于小数据包需要通过 RTS/CTS交互, 那么当 UE准备向 AP 发送小数据包时, UE先向 AP发送 RTS消息, 当收到 CTS消息之后再发送小数 据包。 当然, 也可以对小数据包配置直接发送的形式, 当 UE希望检测 WiFi 上行链路的可用性时, 直接向 AP发送小数据包, 看是否可以收到 AP返回的 ACK消息。发送小数据包所需的 RTS或者直接发送下的小数据包的发送周期可 以较长, 这样不会与 WLAN的重发机制相冲突。 并且, 由于这些随机生成的小 数据包不是 UE需要发送的业务数据, 因此 UE可以不进行任何缓存。 当 UE需 要检测第一空口的可用性时, UE直接生成小数据包并将小数据包发送出去, 无需缓存, 从而不会浪费存储空间。
在 UE发送小数据包的过程中, 当向 AP重发小数据包的次数超过预定次 数时, 或者, 当向 AP重发小数据包的时间超过第一预定时间时, 或者, 当在 第二预定时间内没有收到 AP响应于 UE发送的小数据包而返回的响应时, UE 可以确定 WiFi上行链路不可用, 从而 WiFi空口不可用。
根据另一实施例, 在 S502中, 接收第一空口的接入设备生成并发送的指 示第一空口不可用的第二消息。
根据本发明的实施例, 可以接收第一空口的接入设备在如下之一的情形 下生成并发送的指示第一空口不可用的第二消息: 当向用户终端重发数据包 的次数超过预定次数时, 或者, 当向用户终端重发数据包的时间超过第一预 定时间时, 或者, 当在第二预定时间内没有收到用户终端响应于接入设备发 送的数据包而返回的响应时。
以 AP发现 WiFi空口不可用为例进行描述,但是本发明并不限于 WiFi空 口不可用, 还可以是其它不可靠空口或者可靠性功能被弱化的空口。
当 AP通过 WiFi链路进行下行数据发送时, 在使用 RTS/CTS机制的情况 下, AP可以先向 UE发送 RTS消息, 如果 AP收到 UE返回的 CTS消息, 那么 AP可以开始发送数据包, UE如果成功解码收到的数据包, 则向 AP返回 ACK 消息。
当 AP向 UE发送 RTS消息时, 由于网络拥塞或其它原因, AP在第二预定 时间内没有收到 CTS消息, 那么 AP判断 WiFi下行链路不可用, 从而 WiFi空 口不可用。 在第二预定时间内, AP可能向 UE重发了多次 RTS消息。
当 AP收到 CTS消息并开始发送数据包时,如果 AP没有收到 UE返回的 ACK 消息, 那么 AP对数据包进行重传直到收到 UE返回的 ACK消息。 但是, 如果 AP对数据包的重传次数超过了预定次数, 例如 7次, 那么 AP判断 WiFi下行 链路不可用, 从而 WiFi空口不可用。
当 AP收到 CTS消息并开始发送数据包时, 如果 AP重传数据包的时间超 过了第一预定时间, 但还没有收到 UE返回的 ACK消息, 于是 AP判断 WiFi下 行链路不可用, 从而 WiFi空口不可用。
此外, 当 AP通过 WiFi链路进行下行数据发送时, AP也可以直接向 UE 发送数据包。 AP向 UE发送数据包之后,如果 AP没有收到 UE返回的 ACK消息, 则重发数据包直到收到 UE返回的 ACK消息。 但是, 如果 AP向 UE重发数据包 的次数超过预定次数, 但仍没有收到 UE返回的响应, 则 AP确定 WiFi下行链 路不可用。 如果 AP重发数据包的时间超过第一预定时间, 但在第一预定时间 内仍没有收到 UE返回的响应, 则 AP确定 WiFi下行链路不可用。 如果 AP向 UE发送数据包之后在第二预定时间内没有收到 UE返回的响应,则 AP确定 WiFi 下行链路不可用。
另外, 根据本发明的一个实施例, 第一空口的接入设备可以周期性生成 并向用户终端发送用于检测第一空口的可用性的数据包。 具体到 WiFi空口的 例子中, 当 AP没有下行数据需要发送时, AP可以周期性生成并向 UE发送用 于检测 WiFi空口的可用性的数据包。 该数据包由于无需携带下行数据, 因此 也可被简称为小数据包。 AP通过周期性生成小数据包来判断 WiFi下行链路是 否可用。 该小数据包可以随机生成, 其作用是检测 WiFi链路的可用性, 与数 据传输没有关系。
例如, 如果对于小数据包需要通过 RTS/CTS交互, 那么当 AP准备向 UE 发送小数据包时, AP先向 UE发送 RTS消息, 当收到 CTS消息之后再发送小数 据包。 当然, 也可以对小数据包配置直接发送的形式, 当 AP希望检测 WiFi 下行链路的可用性时, 直接向 UE发送小数据包, 看是否可以收到 UE返回的 ACK消息。发送小数据包所需的 RTS或者直接发送下的小数据包的发送周期可 以较长, 这样不会与 WLAN的重发机制相冲突。 并且, 由于这些随机生成的小 数据包不是 AP需要发送的业务数据, 因此 AP可以不进行任何缓存。 当 AP需 要检测第一空口的可用性时, AP直接生成小数据包并将小数据包发送出去, 无需缓存, 从而不会浪费存储空间。
在 AP发送小数据包的过程中, 当向 UE重发小数据包的次数超过预定次 数时, 或者, 当向 UE重发小数据包的时间超过第一预定时间时, 或者, 当在 第二预定时间内没有收到 UE响应于 AP发送的小数据包而返回的响应时, AP 可以确定 WiFi下行链路不可用, 从而 WiFi空口不可用。
根据本发明的实施例, 在 S502中接收的第二消息可以是应用层信令, 通 过在数据包的头部携带预定标识来指示该数据包携带有应用层信令。 采用应 用层信令的方式可以不改变现有的信令结构, 从而可以容易地将指示空口不 可用的消息引入现有系统, 实现方便。
在 S504中, 根据第二消息, 确定第一空口不可用。
分流点设备收到 S502的第二消息之后, 可以确定第一空口不可用。
S510、 S520和 S530与 S110、 S120和 S130相同, 为了避免重复, 在此不 再赘述。
用于指示第一空口不可用的应用层信令可以具有如图 8和图 9所示的形 式。应用层信令除了指示第一空口不可用之外, 还可以传递其它信息。 在图 8 和图 9中将应用层信令封装在数据包中, 通过在数据包的头部设置预定标识, 可以表明数据包携带有应用层信令。 预定标识可以是预先设定的收发双发达 成一致的任何字符或字符串, 该字符或字符串不会与现有标准发生冲突。 例 如, 在图 8和图 9中通过在数据包的头部携带预定 IP地址来说明该数据包携 带有应用层信令。 在描述封装形式之前, 先参考图 6和图 7描述 Multi-RAT 下的协议栈, 这样对封装形式会有更好的理解。
在图 6所示的协议栈的第一例子中, 主 RAT为 LTE的接入技术, 次 RAT 为 WLAN的接入技术, 因此第二空口为 LTE空口, 第一空口为 WiFi空口。
UE具有 LTE协议栈和 WLAN协议栈。 UE的 WLAN协议栈与 AP的 WLAN协议 栈对等。 AP的以太网协议栈与分流点设备 S-GW的以太网协议栈对等。 UE的 LTE协议栈通过基站内的协议栈转换, 可以与 S-GW的 LTE S1用户面的协议栈 进行通信。
在图 7所示的协议栈的第二例子中, 主 RAT为 UMTS的接入技术, 次 RAT 为 WLAN的接入技术, 因此第二空口为 UMTS空口, 第一空口为 WiFi空口。
UE具有 UMTS协议栈和 WLAN协议栈。 UE的 WLAN协议栈与 AP的 WLAN协 议栈对等。 AP的以太网协议栈与分流点设备 RNC的以太网协议栈对等。 UE的 UMTS协议栈通过基站内的协议栈转换, 可以与 RNC的 UMTS协议栈进行通信。
从图 6和图 7可以看到, 当 WiFi空口不可用时, UE可以通过使用 LTE 协议栈中的应用层信令或者 UMTS协议栈中的应用层信令来向分流点设备通知 WiFi空口不可用。
图 8的封装格式示出了 AP和分流点设备 RNC/S-GW之间传递的关于 UE的 应用层信令数据包格式。
如图 8所示, AP和分流点设备 RNC/S-GW之间的应用层信令数据包包括 IP头部、 TCP (Transmission Control Protocol,传输控制协议)/SCTP ( Stream Control Transmission Protocol, 流控制传输协议) 头部、 隧道层头部和应 用层信令负载。 其中, 隧道层头部包括 IP头部和 TCP/UDP (User Datagram Protocol, 用户数据报协议) 头部, 第一空口不可用的信息携带在应用层信 令负载中。
当 AP向分流点设备发送应用层信令时, 在 IP头部中, 在源 IP地址字段 携带 AP的 IP地址,在目的 IP地址字段携带分流点设备 RNC/S-GW的 IP地址。 在 TCP/SCTP头部中, 通过源端口字段区分 UE。 在隧道层的 IP头部中, 在源 IP地址字段携带 UE的 IP地址, 在目的 IP地址字段携带预定 IP地址, 通过 该预定 IP地址表示该数据包携带有应用层信令。
当 AP从分流点设备接收应用层信令时, 在 IP头部中, 在源 IP地址字段 携带分流点设备 RNC/S-GW的 IP地址,在目的 IP地址字段携带 AP的 IP地址。 在 TCP/SCTP头部中, 通过目的端口区分 UE。 在隧道层的 IP头部中, 在源 IP 地址字段中携带预定 IP地址, 通过预定 IP地址指示该数据包携带有应用层 信令, 在目的 IP地址字段携带 UE的 IP地址。
图 9的封装格式示出了 AP和 UE之间传递的关于 UE的应用层信令数据包 格式。
如图 9所示, AP和 UE之间的应用层信令数据包包括 MAC头部、隧道层头 部和应用层信令负载。 其中, 隧道层头部包括 IP头部和 TCP/UDP头部, 第一 空口不可用的信息携带在应用层信令负载中。
当 AP向 UE发送应用层信令时, 在 MAC头部中, 在源 MAC地址字段携带 AP的 MAC地址, 在目的 MAC地址字段携带 UE的 MAC地址。 在隧道层的 IP头 部中, 在源 IP地址字段携带预定 IP地址, 用于指示该数据包携带有应用层 信令, 在目的 IP地址字段携带 UE的 IP地址。
当 AP从 UE接收应用层信令时,在 MAC头部中,在源 IP地址字段携带 UE 的 MAC地址,在目的 IP地址字段携带 AP的 MAC地址。在隧道层的 IP头部中, 在源 IP地址字段携带 UE的 IP地址, 在目的 IP地址字段携带预定 IP地址, 用于指示该数据包携带有应用层信令。
应用层信令不仅可以用于指示第一空口不可用, 还可以用于传递其它控 制信息。 通过使用应用层信令, 不会对现有的信令结构产生影响, 实现方便, 可以提高系统的扩展性。
上面从网络侧描述了根据本发明实施例的用于数据传输的方法, 下面从 用户侧描述根据本发明实施例的用户数据传输的方法 1000和方法 1100。
如图 10所示, 方法 1000包括:
在 S1010中, 当第一空口不可用时, 接收分流点设备发送的第一消息, 第一消息携带有与分流点设备在第一空口不可用时更新的用户终端在第一空 口上的业务对应的连接上下文信息相关的更新信息, 其中用户终端通过第一 空口经由第一接入网连接到核心网;
在 S1020中, 根据更新信息, 对当前与第一空口上的业务对应的连接上 下文信息进行更新;
在 S1030中,根据更新后的连接上下文信息与分流点设备进行数据传输。 例如,方法 1000可以由用户终端执行。 UE同时通过第二空口和第一空口 连接到核心网, 由分流点设备为 UE提供数据分流传输。当第一空口不可用时, 分流点设备可以向 UE发送第一消息, 来使 UE更新与原本在第一空口上传输 的业务相关的连接上下文信息, 从而可以处理第一空口不可用的问题。 由于 UE的操作与分流点设备的操作相对应, 为了避免重复, UE的操作可以参考上 述方法 100、 300、 400至 500中的相应描述。
根据本发明实施例提供的用于数据传输的方法, 用户终端在发现第一空 口不可用时, 可以根据分流点设备发送的第一消息更新第一空口承载的业务 所对应的连接上下文信息, 这样, 分流点设备和用户终端可以基于同样的连 接上下文信息继续进行数据传输, 从而可以处理当前第一空口承载的业务, 有利于避免 UE通过第一空口进行的数据传输所对应的业务全部中断, 尽量保 证 UE服务的连续性, 从而有利于提高用户的通信体验。
图 11是根据本发明实施例的用于数据传输的另一方法 1100的流程图。 在 S1102中, 向分流点设备发送指示第一空口不可用的第二消息。
UE可以在它检测到第一空口不可用的多种情况下向分流点设备发送第二 消息。 例如, 当向第一空口的接入设备重发数据包的次数超过预定次数时, 或者, 当向接入设备重发数据包的时间超过第一预定时间时, 或者, 当在第 二预定时间内没有收到接入设备返回的响应时。 上述内容可以参考 S502中的 描述。
根据本发明的一个实施例, 第二消息可以是应用层信令, 通过在数据包 的头部携带预定标识来指示该数据包携带有应用层信令。 例如, 应用层信令 可以采用图 9所示的封装格式。 通过使用应用层信令, 不会对现有的信令结 构产生影响, 且实现方便。
在 S1104中, 缓存待通过第一空口向分流点设备发送的上行数据。
当 UE检测到第一空口不可用时, UE可以将当前准备通过第一空口发送的 上行数据缓存起来, 以等待分流点设备的控制而对上行数据进行处理。
在 S1106中, 向分流点设备发送与上行数据有关的上行信息, 以使分流 点设备根据上行信息更新连接上下文信息。
UE缓存上行数据之后, 可以向分流点设备发送上行信息, 上行信息可以 帮助分流点设备判断对与上行数据相关的业务是删除还是搬移到第二空口上 进行传输。 UE发送的上行信息可以包括缓存上行数据所花费的时间, 上行数 据所属的业务, 上行数据的数据量、 上行数据的 QoS 要求、 上行数据对应的 连接上下文信息等。 上述内容可以参考 S420中的描述。
在 S1110中, 接收分流点设备发送的第一消息, 第一消息携带有与分流 点设备在第一空口不可用时更新的用户终端在第一空口上的业务对应的连接 上下文信息相关的更新信息。
第一消息中携带的更新信息可以是分流点设备根据 UE上报的上行数据确 定的, 通过更新信息可以指示 UE对原本在第一空口上传输的业务的连接上下 文信息进行更新。
在 S1115 中, 当更新信息指示的连接上下文信息表明上行数据中存在连 接上下文信息被删除的业务的上行数据时, 将该上行数据丢弃; 或者, 当更 新信息指示的连接上下文信息表明上行数据中存在连接上下文信息被改变为 通过第二空口传输的业务的上行数据时, 将该上行数据通过第二空口向分流 点设备发送。
UE根据更新后的连接上下文信息, 对在 S1104中缓存的上行数据进行处 理。 S1115在 S1110之后执行即可, 与 S1120和 S1130的执行顺序没有关系。
在 S1120中, 根据更新信息, 对当前与第一空口上的业务对应的连接上 下文信息进行更新。
UE收到分流点设备发送的第一消息之后, 由于第一消息携带的更新信息 指示了如何更新连接上下文信息, 因此 UE根据更新信息, 对连接上下文信息 进行更新。 例如, 当更新信息指示删除业务 A的连接上下文信息时, UE删除 业务 A的连接上下文信息。 再例如, 当更新信息指示将业务 B的连接上下文 信息修改为通过第二空口传输时, UE将对业务 B的连接上下文信息进行相应 修改。
在 S1130中,根据更新后的连接上下文信息与分流点设备进行数据传输。
UE更新连接上下文信息之后, 则按照更新后的连接上下文信息与分流点 设备进行后续的数据传输。
根据本发明实施例提供的用于数据传输的方法, 用户终端通过缓存上行 数据并上报上行信息来帮助分流点设备进行连接上下文信息的更新, 有利于 分流点设备更全面的考虑如何更新连接上下文信息, 从而可以提高连接上下 文信息更新的有效性, 保持符合服务质量要求的业务的连续性, 而中断为不 符合服务质量要求的业务继续提供服务, 从而节省网络资源。
接下来,参考图 12至 16描述根据本发明实施例的相关装置的结构框图。 图 12是根据本发明实施例的分流点设备 1200的结构框图。
分流点设备 1200可以是 RNC、 S-GW、 GGSN、 SGSN、 P-GW等网络设备。 分 流点设备 1200可以包括更新模块 1210、 发送模块 1220和传输模块 1230, 其 中更新模块 1210可以由处理器实现, 发送模块 1220可以由发送接口实现, 传输模块 1230可以由收发接口实现。 更新模块 1210可用于当第一空口不可 用时, 更新用户终端在第一空口上的业务对应的连接上下文信息, 其中用户 终端通过第一空口经由第一接入网连接到核心网。 发送模块 1220可用于向用 户终端发送第一消息, 第一消息携带有与更新后的连接上下文信息相关的更 新信息, 用于使用户终端根据更新信息, 对当前与第一空口上的业务对应的 连接上下文信息进行更新得到更新后的连接上下文信息。 传输模块 1230可用 于根据更新后的连接上下文信息和用户终端进行数据传输。
更新模块 1210、 发送模块 1220和传输模块 1230的上述和其他操作和 / 或功能可以参考上述方法 100中的描述, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的分流点设备, 在发现第一空口不可用时, 可以 更新第一空口承载的业务所对应的连接上下文信息并通知给用户终端, 这样, 分流点设备和用户终端可以基于同样的连接上下文信息继续进行数据传输, 从而可以处理当前第一空口承载的业务, 有利于避免 UE通过第一空口进行的 数据传输所对应的业务全部中断, 尽量保证 UE服务的连续性, 从而有利于提 高用户的通信体验。
图 13是根据本发明实施例的分流点设备 1300的结构框图。 分流点设备 1300的更新模块 1310、 发送模块 1320和传输模块 1330与分流点设备 1200 的更新模块 1210、 发送模块 1220和传输模块 1230基本相同。
根据本发明的实施例, 更新模块 1310包括缓存单元 1312和第一更新单 元 1314。缓存单元 1312可用于缓存待通过第一空口向用户终端发送的下行数 据。 第一更新单元 1314可用于更新下行数据所属的第一业务集中的业务对应 的连接上下文信息。
根据本发明的实施例, 用户终端除了通过第一空口经由第一接入网连接 到核心网之外, 还可以通过第二空口经由第二接入网连接到核心网。 根据本发明的一个实施例, 更新模块 1310 还可以包括第二更新单元
1316。 第二更新单元 1316可用于如果第一空口上存在除了第一业务集中的业 务之外的用户终端的其他业务, 则将所述其他业务对应的连接上下文信息删 除或改变为通过第二空口传输。
根据本发明的一个实施例, 第一更新单元 1314 可以包括确定子单元
1314-2、 删除子单元 1314-4和改变子单元 1314-6。 确定子单元 1314-2可用 于根据与下行数据相关的下行信息, 确定将第一业务集中的业务搬移到第二 空口上传输是否满足 QoS要求。 删除子单元 1314-4可用于将搬移到第二空口 上传输不满足 QoS 要求的第一业务集中的业务对应的连接上下文信息删除。 改变子单元 1314-6可用于将搬移到第二空口上传输满足 QoS要求的第一业务 集中的业务对应的连接上下文信息从通过第一空口传输改变为通过第二空口 传输。
根据本发明的一个实施例,更新模块 1310还可以包括丢弃单元 1318和 / 或发送单元 1319。 丢弃单元 1318可用于将搬移到第二空口上传输不满足 QoS 要求的第一业务集中的业务的下行数据丢弃。 发送单元 1319可用于将搬移到 第二空口上传输满足 QoS 要求的第一业务集中的业务的下行数据通过第二空 口向用户终端发送。
根据本发明的一个实施例, 分流点设备 1300还可以包括接收模块 1302 和确定模块 1304。接收模块 1302可用于接收用户终端生成并发送的指示第一 空口不可用的第二消息, 或者接收第一空口的接入设备生成并发送的指示第 一空口不可用的第二消息。 确定模块 1304可用于根据所述第二消息, 确定第 一空口不可用。
例如, 当指示第一空口不可用的第二消息由用户终端生成并发送时, 接 收模块 1302可用于接收用户终端在如下之一的情形下生成并发送的指示第一 空口不可用的第二消息: 当向第一空口的接入设备重发数据包的次数超过预 定次数时, 或者, 当向接入设备重发数据包的时间超过第一预定时间时, 或 者, 当在第二预定时间内没有收到接入设备响应于用户终端发送的数据包而 返回的响应时。 根据本发明的一个实施例, 用户设备发送的数据包可以是用 户设备周期性生成并向第一空口的接入设备发送的用于检测第一空口的可用 性的数据包。
再例如, 当指示第一空口不可用的第二消息由第一空口的接入设备生成 并发送时, 接收模块 1302可用于接收第一空口的接入设备在如下之一的情形 下生成并发送的指示第一空口不可用的第二消息: 当向用户终端重发数据包 的次数超过预定次数时, 或者, 当向用户终端重发数据包的时间超过第一预 定时间时, 或者, 当在第二预定时间内没有收到用户终端响应于接入设备发 送的数据包而返回的响应时。 根据本发明的一个实施例, 第一空口的接入设 备发送的数据包可以是接入设备周期性生成并向用户终端发送的用于检测第 一空口的可用性的数据包。
接收模块 1302接收的第二消息可以是应用层信令,通过在数据包的头部 携带预定标识来指示该数据包携带有应用层信令。
缓存单元 1312、 第一更新单元 1314、 第二更新单元 1316、 确定子单元 1314-2、 删除子单元 1314-4、 改变子单元 1314-6、 丢弃单元 1318、 发送单元 1319、 接收模块 1302和确定模块 1304的上述和其他操作和 /或功能可以参考 方法 100、 300和 500中的描述, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的分流点设备, 通过根据服务质量要求来确定如 何更新分流点设备缓存的下行数据对应的业务的连接上下文信息, 可以有效 处理第一空口上的业务, 尽量维持业务的连续性, 但又不对业务的服务质量 产生不利影响, 从而可以更有效的利用网络资源, 避免网络资源浪费在传输 不符合服务质量要求的业务上。
图 14是根据本发明实施例的分流点设备 1400的结构框图。 分流点设备 1400的更新模块 1410、 发送模块 1420和传输模块 1430与分流点设备 1200 的更新模块 1210、 发送模块 1220和传输模块 1230基本相同。
根据本发明的实施例,更新模块 1410可以包括缓存单元 1412、获取单元 1414和第一更新单元 1416。 缓存单元 1412可用于缓存待通过第一空口向用 户终端发送的下行数据。 获取单元 1414可用于获取与用户终端缓存的上行数 据相关的上行信息。 第一更新单元 1416可用于更新与下行数据所属的第一业 务集和基于上行信息的第二业务集中的业务对应的连接上下文信息。
根据本发明的实施例, 用户终端除了通过第一空口经由第一接入网连接 到核心网之外, 还可以通过第二空口经由第二接入网连接到核心网。 根据本发明的一个实施例, 更新模块 1410还可以包括第二更新单元 1417。 第二更新单元 1417可用于如果第一空口上存在除了第一业务集和第二 业务集中的业务之外的用户终端在第一空口上的其他业务, 则将所述其他业 务对应的连接上下文信息删除或改变为通过第二空口传输。
根据本发明的一个实施例,第一更新模块 1416可以包括第一确定子单元 1416-2、 第二确定子单元 1416-4、 删除子单元 1416-6和改变子单元 1416-8。 第一确定子单元 1416-2可用于根据与下行数据相关的下行信息, 确定将第一 业务集中的业务搬移到第二空口上传输是否满足 QoS要求。 第二确定子单元 1416-4可用于根据上行信息, 确定将第二业务集中的业务搬移到第二空口上 传输是否满足 QoS要求。 删除子单元 1416-6可用于将搬移到第二空口上传输 不满足 QoS要求的第一业务集和第二业务集中的业务对应的连接上下文信息 删除。 改变子单元 1416-8可用于将搬移到第二空口上传输满足 QoS要求的第 一业务集和第二业务集中的业务对应的连接上下文信息从通过第一空口传输 改变为通过第二空口传输。
根据本发明的一个实施例,更新模块 1410还可以包括丢弃单元 1418和 / 或发送单元 1419。 丢弃单元 1418可用于将搬移到第二空口上传输不满足 QoS 要求的第一业务集中的业务的下行数据丢弃。 发送单元 1419可用于将搬移到 第二空口上传输满足 QoS要求的第一业务集中的业务的下行数据通过第二空 口向用户终端发送。
缓存单元 1412、获取单元 1414、第一更新单元 1416、第二更新单元 1417、 第一确定子单元 1416-2、第二确定子单元 1416-4、删除子单元 1416-6、改变 子单元 1416-8、丢弃单元 1418和发送单元 1419的上述和其他操作和 /或功能 可以参考上述方法 400中的描述, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的分流点设备, 通过根据服务质量要求来确定如 何更新分流点设备缓存的下行数据和用户终端缓存的上行数据对应的业务的 连接上下文信息, 可以有效处理第一空口上的业务, 尽量维持业务的连续性, 但又不对业务的服务质量产生不利影响, 从而可以更有效的利用网络资源, 避免网络资源浪费在传输不符合服务质量要求的业务上。
图 15是根据本发明实施例的用户终端 1500的结构框图。
用户终端 1500可以是手机、个人计算机、数字助手等设备。用户终端 1500 可以包括接收模块 1510、 更新模块 1520和传输模块 1530, 接收模块 1510可 以由接收接口实现, 更新模块 1520可以由处理器实现, 传输模块 1530可以 由收发接口实现。 接收模块 1510可用于当第一空口不可用时, 接收分流点设 备发送的第一消息, 第一消息携带有与分流点设备在第一空口不可用时更新 的用户终端在第一空口上的业务对应的连接上下文信息相关的更新信息, 其 中述用户终端通过第一空口经由第一接入网连接到核心网。 更新模块 1520可 用于根据更新信息, 对当前与第一空口上的业务对应的连接上下文信息进行 更新。 传输模块 1530可用于根据更新后的连接上下文信息与分流点设备进行 数据传输。
接收模块 1510、 更新模块 1520和传输模块 1530的上述和其他操作和 / 或功能可以参考上述方法 1000中的描述, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的用户终端, 在发现第一空口不可用时, 可以根 据分流点设备发送的第一消息更新第一空口承载的业务所对应的连接上下文 信息, 这样, 分流点设备和用户终端可以基于同样的连接上下文信息继续进 行数据传输, 从而可以处理当前第一空口承载的业务, 有利于避免 UE通过第 一空口进行的数据传输所对应的业务全部中断, 尽量保证 UE服务的连续性, 从而有利于提高用户的通信体验。
图 16是根据本发明实施例的用户终端 1600的结构框图。 用户终端 1600 的接收模块 1610、更新模块 1620和传输模块 1630与用户终端 1500的接收模 块 1510、 更新模块 1520和传输模块 1530基本相同。
根据本发明的一个实施例, 用户终端 1600 还可以包括第一发送模块 1602。 第一发送模块 1602可用于当向第一空口的接入设备重发数据包的次数 超过预定次数时, 向分流点设备发送指示第一空口不可用的第二消息; 或者, 当向接入设备重发数据包的时间超过第一预定时间时, 向分流点设备发送指 示第一空口不可用的第二消息; 或者, 当在第二预定时间内没有收到接入设 备返回的响应时, 向分流点设备发送指示第一空口不可用的第二消息。
根据本发明的一个实施例, 第二消息可以是应用层信令, 通过在数据包 的头部携带预定标识来指示该数据包携带有应用层信令。
根据本发明的一个实施例,用户终端 1600还可以包括缓存模块 1604。缓 存模块 1604可用于缓存待通过第一空口向分流点设备发送的上行数据。 根据本发明的一个实施例, 用户终端 1600 还可以包括第二发送模块 1606。 第二发送模块 1606可用于向分流点设备发送与上行数据有关的上行信 息, 以使分流点设备根据上行信息更新连接上下文信息。
根据本发明的实施例,用户终端 1600除了通过第一空口经由第一接入网 连接到核心网之外, 还可以通过第二空口经由第二接入网连接到核心网。
根据本发明的一个实施例,用户终端 1600还可以包括丢弃模块 1640和 / 或第三发送模块 1650。丢弃模块 1640可用于当更新信息指示的连接上下文信 息表明上行数据中存在连接上下文信息被删除的业务的上行数据时, 将该上 行数据丢弃。 第三发送模块 1650可用于当更新信息指示的连接上下文信息表 明上行数据中存在连接上下文信息被改变为通过第二空口传输的业务的上行 数据时, 将该上行数据通过第二空口向分流点设备发送。
第一发送模块 1602、缓存模块 1604、第二发送模块 1606、丢弃模块 1640 和第三发送模块 1650的上述和其他操作和 /或功能可以参考上述方法 1100中 的描述, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的用户终端, 通过缓存上行数据并上报上行信息 来帮助分流点设备进行连接上下文信息的更新, 有利于分流点设备更全面的 考虑如何更新连接上下文信息, 从而可以提高连接上下文信息更新的有效性, 保持符合服务质量要求的业务的连续性, 而中断为不符合服务质量要求的业 务继续提供服务, 从而节省网络资源。
接下来, 结合图 17描述根据本发明实施例的用于数据传输的系统 1700 的示意图。
系统 1700包括分流点设备 1710和用户终端 1720。
分流点设备 1710可用于当第一空口不可用时, 更新用户终端 1720在第 一空口上的业务对应的连接上下文信息, 其中用户终端 1720通过第一空口经 由第一接入网连接到核心网; 向用户终端 1720发送第一消息, 第一消息携带 有与更新后的连接上下文信息相关的更新信息; 根据更新后的连接上下文信 息和用户终端 1720进行数据传输。
用户终端 1720可用于当第一空口不可用时, 接收分流点设备 1710发送 的第一消息; 根据更新信息, 对当前与第一空口上的业务对应的连接上下文 信息进行更新; 根据更新后的连接上下文信息与分流点设备 1710进行数据传 输。
分流点设备 1710 的上述和其他操作和 /或功能可以参考上述方法 100、 300、 400和 500中的描述, 用户终端 1720的上述和其他操作和 /或功能可以 参考上述方法 1000和 1100中的描述。
根据本发明实施例提供的用于数据传输的系统, 分流点设备在发现第一 空口不可用时, 可以更新第一空口承载的业务所对应的连接上下文信息并通 知给用户终端, 这样, 分流点设备和用户终端可以基于同样的连接上下文信 息继续进行数据传输, 从而可以处理当前第一空口承载的业务, 有利于避免 UE通过第一空口进行的数据传输所对应的业务全部中断,尽量保证 UE服务的 连续性, 从而有利于提高用户的通信体验。
本领域技术人员可以意识到, 结合本文中所公开的实施例中描述的各方 法步骤和单元, 能够以电子硬件、 计算机软件或者二者的结合来实现, 为了 清楚地说明硬件和软件的可互换性, 在上述说明中已经按照功能一般性地描 述了各实施例的步骤及组成。 这些功能究竟以硬件还是软件方式来执行, 取 决于技术方案的特定应用和设计约束条件。 本领域技术人员可以对每个特定 的应用使用不同方法来实现所描述的功能, 但是这种实现不应认为超出本发 明的范围。
结合本文中所公开的实施例描述的方法步骤可以用硬件、 处理器执行的 软件程序、或者二者的结合来实施。软件程序可以置于随机存取存储器(RAM)、 内存、 只读存储器 (R0M)、 电可编程 R0M、 电可擦除可编程 R0M、 寄存器、 硬 盘、可移动磁盘、 CD-ROM或技术领域内所公知的任意其它形式的存储介质中。
尽管已示出和描述了本发明的一些实施例, 但本领域技术人员应该理解, 在不脱离本发明的原理和精神的情况下, 可对这些实施例进行各种修改, 这 样的修改应落入本发明的范围内。

Claims

权 利 要 求
1. 一种用于数据传输的方法, 其特征在于, 包括:
当第一空口不可用时,更新用户终端在所述第一空口上的业务对应的连接 上下文信息,其中所述用户终端通过所述第一空口经由第一接入网连接到核心 网;
向所述用户终端发送第一消息,所述第一消息携带有与更新后的连接上下 文信息相关的更新信息, 用于使所述用户终端根据所述更新信息,对当前与所 述第一空口上的业务对应的连接上下文信息进行更新得到所述更新后的连接 上下文信息;
根 述更新后的连接上下文信息和所述用户终端进行数据传输。
2. 根据权利要求 1所述的方法, 其特征在于, 所述更新用户终端在所述 第一空口上的业务对应的连接上下文信息包括:
缓存待通过所述第一空口向所述用户终端发送的下行数据;
更新所述下行数据所属的第一业务集中的业务对应的连接上下文信息。
3. 根据权利要求 2所述的方法, 其特征在于, 所述用户终端还通过第二 空口经由第二接入网连接到所述核心网;所述更新用户终端在所述第一空口上 的业务对应的连接上下文信息还包括:
如果所述第一空口上存在除了所述第一业务集中的业务之外的所述用户 终端的其他业务,则将所述其他业务对应的连接上下文信息删除或改变为通过 所述第二空口传输。
4. 根据权利要求 2所述的方法, 其特征在于, 所述用户终端还通过第二 空口经由第二接入网连接到所述核心网;所述更新所述下行数据所属的第一业 务集中的业务对应的连接上下文信息包括:
根据与所述下行数据相关的下行信息,确定将所述第一业务集中的业务搬 移到所述第二空口上传输是否满足服务质量要求;
将搬移到所述第二空口上传输不满足服务质量要求的所述第一业务集中 的业务对应的连接上下文信息删除;
将搬移到所述第二空口上传输满足服务质量要求的所述第一业务集中的 业务对应的连接上下文信息从通过所述第一空口传输改变为通过所述第二空 口传输。
5. 根据权利要求 1所述的方法, 其特征在于, 所述更新用户终端在所述 第一空口上的业务对应的连接上下文信息包括:
缓存待通过所述第一空口向所述用户终端发送的下行数据;
获取与所述用户终端缓存的上行数据相关的上行信息;
更新与所述下行数据所属的第一业务集和基于所述上行信息的第二业务 集中的业务对应的连接上下文信息。
6. 根据权利要求 5所述的方法, 其特征在于, 所述用户终端还通过第二 空口经由第二接入网连接到所述核心网;所述更新用户终端在所述第一空口上 的业务对应的连接上下文信息还包括:
如果所述第一空口上存在除了所述第一业务集和所述第二业务集中的业 务之外的所述用户终端的其他业务,则将所述其他业务对应的连接上下文信息 删除或改变为通过所述第二空口传输。
7. 根据权利要求 5所述的方法, 其特征在于, 所述用户终端还通过第二 空口经由第二接入网连接到所述核心网;所述更新与所述下行数据所属的第一 业务集和基于所述上行信息的第二业务集中的业务对应的连接上下文信息包 括:
根据与所述下行数据有关的下行信息,确定将所述第一业务集中的业务搬 移到所述第二空口上传输是否满足服务质量要求;
根据所述上行信息,确定将所述第二业务集中的业务搬移到所述第二空口 上传输是否满足服务质量要求;
将搬移到所述第二空口上传输不满足服务质量要求的所述第一业务集和 所述第二业务集中的业务对应的连接上下文信息删除;
将搬移到所述第二空口上传输满足服务质量要求的所述第一业务集和所 述第二业务集中的业务对应的连接上下文信息从通过所述第一空口传输改变 为通过所述第二空口传输。
8. 根据权利要求 4或 7所述的方法, 其特征在于, 所述更新用户终端在 所述第一空口上的业务对应的连接上下文信息还包括:
将搬移到所述第二空口上传输不满足服务质量要求的所述第一业务集中 的业务的下行数据丢弃; 或者
将搬移到所述第二空口上传输满足服务质量要求的所述第一业务集中的 业务的下行数据通过所述第二空口向所述用户终端发送。
9. 根据权利要求 1所述的方法, 其特征在于, 所述更新用户终端在所述 第一空口上的业务对应的连接上下文信息之前, 还包括:
接收所述用户终端生成并发送的指示所述第一空口不可用的第二消息,或 者接收所述第一空口的接入设备生成并发送的指示所述第一空口不可用的第 二消息;
根据所述第二消息, 确定所述第一空口不可用。
10. 根据权利要求 9所述的方法, 其特征在于, 所述接收所述用户终端生 成并发送的指示所述第一空口不可用的第二消息包括:
接收所述用户终端在如下之一的情形下生成并发送的指示所述第一空口 不可用的第二消息:
当向所述第一空口的接入设备重发数据包的次数超过预定次数时, 或者 当向所述接入设备重发数据包的时间超过第一预定时间时, 或者 当在第二预定时间内没有收到所述接入设备响应于所述用户终端发送的 数据包而返回的响应时;
其中,所述接收所述第一空口的接入设备生成并发送的指示所述第一空口 不可用的第二消息包括:
接收所述第一空口的接入设备在如下之一的情形下生成并发送的指示所 述第一空口不可用的第二消息:
当向所述用户终端重发数据包的次数超过预定次数时, 或者
当向所述用户终端重发数据包的时间超过第一预定时间时, 或者 当在第二预定时间内没有收到所述用户终端响应于所述接入设备发送的 数据包而返回的响应时。
11. 根据权利要求 10所述的方法, 其特征在于, 所述数据包是周期性生 成并发送的用于检测所述第一空口的可用性的数据包。
12. 根据权利要求 9所述的方法, 其特征在于, 所述第二消息是应用层信 令, 通过在数据包的头部携带预定标识来指示该数据包携带有应用层信令。
13. 一种用于数据传输的方法, 其特征在于, 包括:
当第一空口不可用时,接收分流点设备发送的第一消息, 所述第一消息携 带有与所述分流点设备在所述第一空口不可用时更新的用户终端在所述第一 空口上的业务对应的连接上下文信息相关的更新信息,其中所述用户终端通过 所述第一空口经由第一接入网连接到核心网;
根据所述更新信息,对当前与所述第一空口上的业务对应的连接上下文信 息进行更新;
根据更新后的连接上下文信息与所述分流点设备进行数据传输。
14. 根据权利要求 13所述的方法, 其特征在于, 所述接收分流点设备发 送的第一消息之前, 还包括:
当向所述第一空口的接入设备重发数据包的次数超过预定次数时,向所述 分流点设备发送指示所述第一空口不可用的第二消息; 或者
当向所述接入设备重发数据包的时间超过第一预定时间时,向所述分流点 设备发送指示所述第一空口不可用的第二消息; 或者
当在第二预定时间内没有收到所述接入设备响应于所述用户终端发送的 数据包而返回的响应时,向所述分流点设备发送指示所述第一空口不可用的第 二消息。
15. 根据权利要求 14所述的方法, 其特征在于, 所述数据包是周期性生 成并发送的用于检测所述第一空口的可用性的数据包。
16. 根据权利要求 14所述的方法, 所述第二消息是应用层信令, 通过在 数据包的头部携带预定标识来指示该数据包携带有应用层信令。
17. 根据权利要求 13所述的方法, 其特征在于, 所述接收分流点设备发 送的第一消息之前, 还包括:
缓存待通过所述第一空口向所述分流点设备发送的上行数据。
18. 根据权利要求 17所述的方法, 其特征在于, 所述缓存待通过所述第 一空口向所述分流点设备发送的上行数据之后, 还包括:
向所述分流点设备发送与所述上行数据有关的上行信息,以使所述分流点 设备根据所述上行信息更新所述连接上下文信息。
19. 根据权利要求 17或 18所述的方法, 其特征在于, 所述用户终端还通 过第二空口经由第二接入网连接到所述核心网;所述接收分流点设备发送的第 一消息之后, 还包括:
当所述更新信息指示的连接上下文信息表明所述上行数据中存在连接上 下文信息被删除的业务的上行数据时, 将该上行数据丢弃; 或者
当所述更新信息指示的连接上下文信息表明所述上行数据中存在连接上 下文信息被改变为通过所述第二空口传输的业务的上行数据时,将该上行数据 通过所述第二空口向所述分流点设备发送。
20. 一种分流点设备, 其特征在于, 包括:
更新模块, 用于当第一空口不可用时, 更新用户终端在所述第一空口上的 业务对应的连接上下文信息,其中所述用户终端通过所述第一空口经由第一接 入网连接到核心网;
发送模块, 用于向所述用户终端发送第一消息,所述第一消息携带有与更 新后的连接上下文信息相关的更新信息,用于使所述用户终端根据所述更新信 息,对当前与所述第一空口上的业务对应的连接上下文信息进行更新得到所述 更新后的连接上下文信息;
传输模块,用于根据所述更新后的连接上下文信息和所述用户终端进行数 据传输。
21. 根据权利要求 20所述的分流点设备, 其特征在于, 所述更新模块包 括:
缓存单元, 用于缓存待通过所述第一空口向所述用户终端发送的下行数 据.
第一更新单元,用于更新所述下行数据所属的第一业务集中的业务对应的 连接上下文信息。
22. 根据权利要求 21所述的分流点设备, 其特征在于, 所述用户终端还 通过第二空口经由第二接入网连接到所述核心网; 所述更新模块还包括: 第二更新单元,用于如果所述第一空口上存在除了所述第一业务集中的业 务之外的所述用户终端的其他业务,则将所述其他业务对应的连接上下文信息 删除或改变为通过所述第二空口传输。
23. 根据权利要求 21所述的分流点设备, 其特征在于, 所述用户终端还 通过第二空口经由第二接入网连接到所述核心网; 所述第一更新单元包括: 确定子单元,用于根据与所述下行数据相关的下行信息, 确定将所述第一 业务集中的业务搬移到所述第二空口上传输是否满足服务质量要求;
删除子单元,用于将搬移到所述第二空口上传输不满足服务质量要求的所 述第一业务集中的业务对应的连接上下文信息删除;
改变子单元,用于将搬移到所述第二空口上传输满足服务质量要求的所述 第一业务集中的业务对应的连接上下文信息从通过所述第一空口传输改变为 通过所述第二空口传输。
24. 根据权利要求 20所述的分流点设备, 其特征在于, 所述更新模块包 括:
缓存单元, 用于缓存待通过所述第一空口向所述用户终端发送的下行数 据.
获取单元, 用于获取与所述用户终端缓存的上行数据相关的上行信息; 第一更新单元,用于更新与所述下行数据所属的第一业务集和基于所述上 行信息的第二业务集中的业务对应的连接上下文信息。
25. 根据权利要求 24所述的分流点设备, 其特征在于, 所述用户终端还 通过第二空口经由第二接入网连接到所述核心网; 所述更新模块还包括: 第二更新单元,用于如果所述第一空口上存在除了所述第一业务集和所述 第二业务集中的业务之外的所述用户终端的其他业务,则将所述其他业务对应 的连接上下文信息删除或改变为通过所述第二空口传输。
26. 根据权利要求 24所述的分流点设备, 其特征在于, 所述用户终端还 通过第二空口经由第二接入网连接到所述核心网; 所述第一更新单元包括: 第一确定子单元, 用于根据与所述下行数据有关的下行信息, 确定将所述 第一业务集中的业务搬移到所述第二空口上传输是否满足服务质量要求; 第二确定子单元, 用于根据所述上行信息, 确定将所述第二业务集中的业 务搬移到所述第二空口上传输是否满足服务质量要求;
删除子单元,用于将搬移到所述第二空口上传输不满足服务质量要求的所 述第一业务集和所述第二业务集中的业务对应的连接上下文信息删除;
改变子单元,用于将搬移到所述第二空口上传输满足服务质量要求的所述 第一业务集和所述第二业务集中的业务对应的连接上下文信息从通过所述第 一空口传输改变为通过所述第二空口传输。
27. 根据权利要求 23或 26所述的分流点设备, 其特征在于, 所述更新模 块还包括:
丢弃单元,用于将搬移到所述第二空口上传输不满足服务质量要求的所述 第一业务集中的业务的下行数据丢弃; 或者
发送单元,用于将搬移到所述第二空口上传输满足服务质量要求的所述第 一业务集中的业务的下行数据通过所述第二空口向所述用户终端发送。
28. 根据权利要求 20所述的分流点设备, 其特征在于, 还包括: 接收模块,用于接收所述用户终端生成并发送的指示所述第一空口不可用 的第二消息,或者接收所述第一空口的接入设备生成并发送的指示所述第一空 口不可用的第二消息;
确定模块, 用于根据所述第二消息, 确定所述第一空口不可用。
29. 根据权利要求 28所述的分流点设备, 其特征在于, 所述接收模块用 于接收所述用户终端在如下之一的情形下生成并发送的指示所述第一空口不 可用的第二消息: 当向所述第一空口的接入设备重发数据包的次数超过预定次数时, 或者 当向所述接入设备重发数据包的时间超过第一预定时间时, 或者 当在第二预定时间内没有收到所述接入设备响应于所述用户终端发送的 数据包而返回的响应时;
或者,所述接收模块用于接收所述第一空口的接入设备在如下之一的情形 下生成并发送的指示所述第一空口不可用的第二消息:
当向所述用户终端重发数据包的次数超过预定次数时, 或者
当向所述用户终端重发数据包的时间超过第一预定时间时, 或者 当在第二预定时间内没有收到所述用户终端响应于所述接入设备发送的 数据包而返回的响应时。
30. 根据权利要求 28所述的分流点设备, 其特征在于, 所述第二消息是 应用层信令,通过在数据包的头部携带预定标识来指示该数据包携带有应用层 信令。
°
31 . 一种用户终端, 其特征在于, 包括:
接收模块, 用于当第一空口不可用时, 接收分流点设备发送的第一消息, 所述第一消息携带有与所述分流点设备在所述第一空口不可用时更新的用户 终端在所述第一空口上的业务对应的连接上下文信息相关的更新信息,其中所 述用户终端通过所述第一空口经由第一接入网连接到核心网;
更新模块, 用于根据所述更新信息,对当前与所述第一空口上的业务对应 的连接上下文信息进行更新;
传输模块,用于根据更新后的连接上下文信息与所述分流点设备进行数据 传输。
32. 根据权利要求 31所述的用户终端, 其特征在于, 还包括:
第一发送模块,用于当向所述第一空口的接入设备重发数据包的次数超过 预定次数时, 向所述分流点设备发送指示所述第一空口不可用的第二消息; 或 者, 当向所述接入设备重发数据包的时间超过第一预定时间时, 向所述分流点 设备发送指示所述第一空口不可用的第二消息; 或者, 当在第二预定时间内没 有收到所述接入设备响应于所述用户终端发送的数据包而返回的响应时,向所 述分流点设备发送指示所述第一空口不可用的第二消息。
33. 根据权利要求 32所述的用户终端, 所述第二消息是应用层信令, 通 过在数据包的头部携带预定标识来指示该数据包携带有应用层信令。
34. 根据权利要求 31所述的用户终端, 其特征在于, 还包括:
缓存模块,用于缓存待通过所述第一空口向所述分流点设备发送的上行数 据。
35. 根据权利要求 34所述的用户终端, 其特征在于, 还包括:
第二发送模块,用于向所述分流点设备发送与所述上行数据有关的上行信 息, 以使所述分流点设备根据所述上行信息更新所述连接上下文信息。
36. 根据权利要求 34或 35所述的用户终端, 其特征在于, 所述用户终端 还通过第二空口经由第二接入网连接到所述核心网; 所述用户终端还包括: 丢弃模块,用于当所述更新信息指示的连接上下文信息表明所述上行数据 中存在连接上下文信息被删除的业务的上行数据时,将该上行数据丢弃; 或者 第三发送模块,用于当所述更新信息指示的连接上下文信息表明所述上行 数据中存在连接上下文信息被改变为通过所述第二空口传输的业务的上行数 据时, 将该上行数据通过所述第二空口向所述分流点设备发送。
37. 一种用于数据传输的系统, 其特征在于, 所述系统包括分流点设备和 用户终端, 其中:
所述分流点设备, 用于当第一空口不可用时, 更新所述用户终端在所述第 一空口上的业务对应的连接上下文信息,其中所述用户终端通过所述第一空口 经由第一接入网连接到核心网; 向所述用户终端发送第一消息, 所述第一消息 携带有与更新后的连接上下文信息相关的更新信息;根据所述更新后的连接上 下文信息和所述用户终端进行数据传输;
所述用户终端,用于当所述第一空口不可用时,接收所述分流点设备发送 的所述第一消息; 根据所述更新信息, 对当前与所述第一空口上的业务对应的 连接上下文信息进行更新;根据更新后的连接上下文信息与所述分流点设备进 行数据传输。
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