WO2014173225A1

WO2014173225A1 - User plane congestion handling method, device and serving gateway

Info

Publication number: WO2014173225A1
Application number: PCT/CN2014/074611
Authority: WO
Inventors: 朱进国
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-04-23
Filing date: 2014-04-02
Publication date: 2014-10-30
Also published as: CN104125607A

Abstract

Provided are a user plane congestion handling method, device and serving gateway (S-GW), the method comprising: receiving congestion information of base station user plane congestion; caching a data packet according to the data packet priority issued to the base station; and issuing the cached data packet according to the priority. The present invention solves the problems in the relevant art of handling capacity congestion of a base station, and link congestion between the base station and an S-GW in case of base station user plane congestion, so as to effectively address the wireless resource congestion on an air interface of a cell without additional handling by the base station, and further effectively alleviate link congestion between the base station and the S-GW by reducing the rate of transmitting data packets from an S-GW to the base station when the user plane of the base station is congested.

Description

The present invention relates to the field of communications, and in particular to a user plane congestion processing method, apparatus, and service gateway. 1 is a schematic diagram of a wireless communication system in the related art. As shown in FIG. 1, the main functions of each device in the wireless communication system are as follows: Terminal: User equipment (User Equipment, UE for short), user equipment through wireless Accessing the base station, the terminal and the mobility management unit of the core network communicate with each other through a Non-Access Stratum (NAS) interface. Radio Access Network (RAN): Responsible for managing the establishment and maintenance of over-the-air radio resources between the UE and the radio access nodes (NodeB and/or evolved NodeB). The processing strength of the data packet of the base station is a bearer, and each bearer has a QoS Class Identifier (QII) to identify a required Quality of Service (abbreviated as) class, and the base station carries the bearer. All packets transmitted are processed using the same QoS class. The mobility management entity is a control plane entity that temporarily stores user data. It is responsible for managing and storing UE contexts (such as UE/user identity, mobility management status, user security parameters, etc.), responsible for mobility management and establishing user planes. Hosted. The mobility management entity is called MME (Mobility Management Entity) in the 4G system, and is called the Serving GPRS Support Node (SGSN) in the 2G and 3G systems. The MME and the RAN are connected by an SI-C interface, and the SGSN and the RAN are connected by an Iu-C interface, and C represents a control plane. Home Location Register (HLR), located in the home network, the main function is to provide subscription information and authentication. When the user accesses the mobility management unit from the visited location, the authentication information needs to be obtained from the HLR and the terminal is authenticated. If the authentication is successful, the subscription information is continuously obtained from the HLR. The HLR also checks to see if the user is allowed to roam to the visited mobile management unit. The Serving Gateway (S-GW) is a user plane anchor that moves between 2/3G and the evolved 3G system. The S-GW is also responsible for receiving the downlink when the user is idle. Data When the packet is cached, the data is cached and the mobility management unit is triggered to initiate paging to the user. The S-GW and the mobility management entity are connected through an interface, which is based on the GPRS Tunneling Protocol-C (GTP-C), where C is the control panel; and the S-GW is connected to the base station through an interface. , the interface is based on GTP-U,

U represents the user plane. Packet Data Network Gateway (PDN GW or P-GW for short). The packet data gateway is responsible for the gateway function of the UE accessing the Packet Data Network (PDN), and assigns a user IP (Internet Protocol) address to the user. When the bearer is established, the PDN GW determines the QoS parameters corresponding to the bearer, including the QoS Class Identifier (QCI), the Address Resolution Protocol (ARP), and the cumulative maximum rate (Maximum). The Bit Rate (MBR) and the Aggregate Maximum Bit Rate (AMBR) are sent to the S-GW and the MME. In the related art, the PDN GW and the Serving GW may be combined in one physical entity. The P-GW and the S-GW are connected through an S5/S8 interface. The S5 and S8 interfaces have user planes and control planes. The S5/S8 interfaces are based on GTP or Proxy Mobile Internet Protocol version 6, referred to as PMIPv6. Policy and Charging Rules Function (Policy and Charging Rules Function, referred to as

PCRF) is mainly responsible for determining the formulation and control of QoS policies and charging policies that carry dynamics. When the user establishes a bearer, the PCRF sends the QoS rule to the P-GW for execution through the Gx interface. In a wireless communication system, radio resources are limited. When a user residing in a certain cell initiates a large amount of traffic, it is very easy to cause user congestion of the cell. The base station user plane congestion has the following three possibilities: 1) cell air interface radio resource congestion 2) base station processing capacity congestion 3) link congestion between the base station and the S-GW. 2 is a flowchart of a method for processing user plane congestion in the related art. As shown in FIG. 2, the main idea of the method is that the P-GW adds a priority indication to the GTP-U packet header, and when the base station generates a cell user plane, When congestion occurs, the base station needs to process the corresponding data packet according to the priority, thereby alleviating user plane congestion. The main steps of the method are as follows: Step S202: The PCRF sends a policy to the P-GW, according to which the P-GW can select a downlink packet setting priority of a specific application. Generally, the P-GW only sets priorities for different application packets on the default bearer (QCI=8 or QCI=9), and does not set for dedicated bearers. For the same application, different users may have different priorities, which can reflect the difference of the contract. The P-GW can also configure a universal priority setting policy for all users locally. Step S204: When the P-GW receives the downlink data packet, the P-GW detects the application information of the data packet by using the deep packet check, and according to the foregoing policy, sets the GTP-U header of the downlink data packet. The corresponding priority. Step S206, the P-GW sends the GTP-U packet with priority to the S-GW through the S5\S8 user plane. Step S208, the S-GW replaces the GTP-U header of the data packet with the SI GTP-U header. If the priority is received on the S5\S8 interface, the same priority is set on the SI GTP-U header. Step S210: After receiving the S1 GTP-U data packet, the base station first performs scheduling according to the bearer QCI where the data packet is located. If the packet header includes the priority indication information, the base station needs to consider the priority indication of the data packet. For example, if the base station determines that user plane congestion has occurred, it preferentially allocates resources for the data packet indicated by the high priority. The base station sends the data packet to the terminal through the air interface. Through the foregoing method, the base station can perform different priority processing on each data packet on the default bearer, which can limit the excessive bandwidth of the wireless bandwidth of some applications, thereby alleviating wireless resource congestion. However, the above method also increases the processing of the priority indication for the base station, which further deteriorates the processing capability of the base station, and the above method cannot alleviate the link congestion between the base station and the S-GW. Therefore, in the related art, when the base station user plane is congested, there is still congestion of the base station processing capability and link congestion between the base station and the S-GW. SUMMARY OF THE INVENTION The present invention provides a user plane congestion processing method, apparatus, and service gateway to address at least the congestion of a base station user plane in a related art, or a base station processing capability congestion, and a chain between a base station and an S-GW. Road congestion problem. According to an aspect of the present invention, a user plane congestion processing method is provided, including: receiving congestion information of a user plane congestion at a base station; and performing the data packet according to a priority of a data packet sent to the base station Caching; delivering the cached packet according to the priority. Preferably, the buffering the data packet according to the priority of the data packet sent to the base station comprises: setting different queues according to different priorities of the data packet; The queue corresponding to the priority caches the data packet. Preferably, the data packet that is buffered according to the priority level includes: setting a time interval for sending the data packet to the base station according to the priority; and buffering according to the time interval The data packet. Preferably, the congestion information of the user plane congestion is received by the base station by: at least one of: receiving, by the control plane, the congestion information of the user plane congestion at the base station; receiving the base station by using a user plane The congestion information of the user plane congestion occurs; and the congestion information of the user plane congestion of the base station is received from the network information collection unit. Preferably, the receiving, by the control plane, the congestion information of the user plane congestion occurs by: receiving the congestion information sent by the mobility management entity by using a control plane message, where the congestion information carries the user a user identifier of a user in the cell under the base station that is congested; and/or receiving the congestion information sent by the mobility management entity by using a control plane message, where the congestion information carries a user plane congestion The base station identifier of the base station. Preferably, before the buffering the data packet according to the priority of the data packet sent to the base station, the method further includes: receiving the data packet sent to the base station; At least one of determining whether the data packet needs to be buffered, and if the determination result is yes, buffering the data packet: determining whether the destination address of the data packet is an overload base station; determining the data packet Whether the corresponding user is located in a cell of the base station that is congested by the user plane. According to another aspect of the present invention, a user plane congestion processing apparatus is provided, including: a first receiving module, configured to receive congestion information of a user plane congestion at a base station; and a buffering module, configured to be configured according to the base station The priority of the sent data packet, the data packet is cached; and the sending module is configured to deliver the cached data packet according to the priority. Preferably, the cache module includes: a first setting unit, configured to set different queues according to different priorities of the data packet; and a buffer unit configured to be according to the queue pair corresponding to the priority The packet is cached. Preferably, the sending module includes: a second setting unit, configured to set a time interval for sending the data packet to the base station according to the priority; a sending unit, configured to be according to the time The buffered packet is sent at intervals. Preferably, the first receiving module includes at least one of the following: a first receiving unit, configured to receive, by using a control plane, the congestion information that is generated by the base station to be congested by a user plane; and the second receiving unit is configured to pass the user And receiving, by the network, the congestion information that is generated by the user base station congestion; and the third receiving unit is configured to receive, by the network information collection unit, the congestion information that is generated by the base station. Preferably, the first receiving unit includes: a first receiving subunit, configured to receive the congestion information sent by the mobility management entity by using a control plane message, where the congestion information carries the user plane congestion The user identifier of the user in the cell under the base station; and/or the second receiving subunit is configured to receive the congestion information sent by the mobility management entity by using a control plane message, where the congestion information carries the user plane The base station identity of the base station that is congested. Preferably, the device further includes: a second receiving module, configured to receive the data packet that is sent to the base station; and a determining module, configured to determine, by at least one of the following manners, whether the data packet needs to be cached, If the result of the determination is yes, the data packet is buffered: determining whether the destination address of the data packet is an overloaded base station; determining whether the user corresponding to the data packet is located at the base station that is congested by the user plane Small area. According to still another aspect of the present invention, a service gateway S-GW is provided, comprising the apparatus of any of the above. According to the present invention, the congestion information of the user plane is received by the base station; the data packet is buffered according to the priority of the data packet sent to the base station; and the cached data is sent according to the priority The packet solves the problem of congestion of the base station processing capability and the link congestion between the base station and the S-GW in the related art when the base station user plane is congested, thereby achieving the reduction of the S when the base station user plane is congested. - The rate at which the GW sends data packets to the base station not only effectively solves the congestion of the radio resource of the cell air interface, but also does not add additional processing to the base station, and the link between the base station and the S-GW is effectively alleviated. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic diagram of a wireless communication system in the related art; FIG. 2 is a flowchart of a processing method for solving user plane congestion in the related art; FIG. 3 is a flowchart of a user plane congestion processing method according to an embodiment of the present invention; Figure 4 is a block diagram showing the structure of a user plane congestion processing apparatus according to an embodiment of the present invention; 5 is a block diagram showing a preferred structure of a buffer module 44 in a user plane congestion processing apparatus according to an embodiment of the present invention; FIG. 6 is a block diagram showing a preferred structure of a sending module 46 in a user plane congestion processing apparatus according to an embodiment of the present invention; A preferred block diagram of the first receiving module 42 in the user plane congestion processing apparatus according to the embodiment of the present invention; FIG. 8 is a preferred embodiment of the first receiving unit 72 in the first receiving module 42 in the user plane congestion processing apparatus according to the embodiment of the present invention. FIG. 9 is a block diagram showing a preferred configuration of a user plane congestion processing apparatus according to an embodiment of the present invention; FIG. 10 is a service gateway according to an embodiment of the present invention; FIG. 11 is a user plane congestion processing method according to a preferred embodiment of the present invention. FIG. 12 is a flowchart of a method for an S-GW to learn user plane congestion on a base station according to an embodiment of the present invention; FIG. 13 is a schematic diagram of a S-GW obtaining a user plane generated by a base station according to an embodiment of the present invention; FIG. 14 is a flowchart of a method for congestion of a base station by a network information collection unit according to an embodiment of the present invention; FIG. FIG. 15 is a flowchart of a process for generating a queue overflow in an S-GW according to an embodiment of the present invention. FIG. 16 is a schematic structural diagram of an S-GW device according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In this embodiment, a user plane congestion processing method is provided. FIG. 3 is a flowchart of a user plane congestion processing method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps: Step S302, receiving The base station generates congestion information of the user plane congestion; Step S304, buffering the data packet according to the priority of the data packet sent to the base station; Step S306, the buffered data packet is delivered according to the priority. Through the above steps, by buffering the data packets sent to the base station, the problem of the base station user plane congestion is solved in the related art, and only the data packet is processed according to the priority at the base station, which not only increases the processing of the base station. The burden is not effective, and the congestion problem of the link between the S-GW and the base station cannot be effectively solved. When congestion occurs on the user plane of the base station, the data packet is cached according to the priority before the data packet is sent to the base station, which is effective not only effective. The rate of sending data packets to the base station is reduced, and the problem of link congestion between the S-GW and the base station is effectively alleviated, and the base station does not need to prioritize the received data packets, which can effectively reduce the processing load of the base station. The problem of congestion of the base station user plane is effectively solved. When the data packet is cached according to the priority of the data packet sent to the base station, multiple methods may be used, and the cache may be cached in the form of a queue. First, different settings are set according to the priority of the data packet. Queue; then cache the packet according to the queue corresponding to the priority. Cacheing packets in the form of queues is not only simple but also intuitive. Of course, other caching methods can also be used. For example, the data packets can be numbered according to the priority of the data packet, and cached according to the order of the numbers. The data packet that is buffered according to the priority may also be used in various manners. For example, the time interval for sending data packets to the base station may be set according to the priority; the buffered data packet is sent according to the time interval, for example, When the congestion can be effectively alleviated, the transmission time interval of the packet with the higher priority is shorter, and the transmission time of the packet with the lower priority is longer. By such processing, the congestion problem can be effectively alleviated. And can also effectively distinguish between different priority packets. The method for receiving user plane congestion on the receiving base station may also be multiple. For example, the congestion information of the user plane congestion may be received by the base station by using at least one of the following methods: receiving congestion information of user plane congestion at the base station by using the control plane; Receiving congestion information of user plane congestion at the base station; receiving congestion information of user plane congestion at the base station from the network information collection unit. Preferably, when the congestion information of the user plane congestion occurs on the base station, the congestion information sent by the mobility management entity through the control plane message is received, where the congestion information carries the congestion information. The user identifier of the user in the cell under the base station where the user plane is congested; and/or receiving the congestion information sent by the mobility management entity through the control plane message, where the congestion information carries the base station identifier of the base station where the user plane congestion occurs. . In order to determine that the destination address of the delivered data packet is indeed the base station where the user plane is congested, before receiving the data packet according to the priority of the data packet sent to the base station, the received data packet may be judged once, that is, First, the data packet sent to the base station is received; determining whether the data packet needs to be buffered, wherein the manner of determining may be multiple, for example, determining whether the destination address of the data packet is an overloaded base station; Whether the user is located in the cell of the base station where the user plane is congested, and if the judgment result is yes, that is, it is determined that the data packet is cached when the data packet needs to be cached. In the embodiment, a user plane congestion processing device is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and has not been described again. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable. 4 is a structural block diagram of a user plane congestion processing apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes a first receiving module 42, a cache module 44, and a sending module 46. The apparatus will be described below. The first receiving module 42 is configured to receive the congestion information of the user plane congestion at the base station, and the buffering module 44 is connected to the first receiving module 42 and configured to perform the data packet according to the priority of the data packet sent to the base station. The cache module is connected to the cache module 44, and is configured to deliver the cached data packet according to the priority. FIG. 5 is a block diagram showing a preferred structure of a cache module 44 in a user plane congestion processing apparatus according to an embodiment of the present invention. As shown in FIG. 5, the cache module 44 includes a first setting unit 52 and a cache unit 54, and the cache module is provided below. 44 for explanation. The first setting unit 52 is configured to set different queues according to different priorities of the data packets. The buffer unit 54 is connected to the first setting unit 52, and is configured to buffer the data packets according to the queue corresponding to the priority. FIG. 6 is a block diagram of a preferred structure of a sending module 46 in a user plane congestion processing apparatus according to an embodiment of the present invention. As shown in FIG. 6, the sending module 46 includes a second setting unit 62 and a sending unit 64. The delivery module 46 will be described. The second setting unit 62 is configured to set a time interval for sending a data packet to the base station according to the priority; the sending unit 64 is connected to the second setting unit 62, and is configured to send the buffered data packet according to the time interval. . FIG. 7 is a block diagram of a preferred structure of the first receiving module 42 in the user plane congestion processing apparatus according to the embodiment of the present invention. As shown in FIG. 7, the first receiving module 42 includes at least one of the following: a first receiving unit 72, The second receiving unit 74 and the third receiving unit 76 will be described below. The first receiving unit 72 is configured to receive the congestion information of the user plane congestion caused by the base station by using the control plane; the second receiving unit 74 is configured to receive the congestion information of the user plane congestion caused by the base station by using the user plane; the third receiving unit 76, It is set to receive congestion information of user plane congestion at the base station from the network information collecting unit. FIG. 8 is a block diagram showing a preferred structure of the first receiving unit 72 in the first receiving module 42 in the user plane congestion processing apparatus according to the embodiment of the present invention. As shown in FIG. 8, the first receiving unit 72 includes a first receiving subunit 82. And/or the second receiving subunit 84, the first receiving unit 72 will be described below. The first receiving sub-unit 82 is configured to receive the congestion information sent by the mobility management entity by using the control plane message, where the congestion information carries the user identifier of the user in the cell under the base station where the user plane is congested; and/or The second receiving sub-unit 84 is configured to receive the congestion information sent by the mobility management entity by using the control plane message, where the congestion information carries the base station identifier of the base station where the user plane is congested. FIG. 9 is a block diagram of a preferred structure of a user plane congestion processing apparatus according to an embodiment of the present invention. As shown in FIG. 9, the structure includes a second receiving module 92 and a determining module 94, in addition to all the modules shown in FIG. The preferred structure will be described below. The second receiving module 92 is connected to the first receiving module 42 and configured to receive the data packet sent to the base station. The determining module 94 is connected to the second receiving module 92 and the buffer module 44, and is configured to be at least If it is determined whether the data packet needs to be buffered, if the judgment result is yes, the data packet is cached: determining whether the destination address of the data packet is an overloaded base station; determining whether the user corresponding to the data packet is located at the user plane Within the cell of the base station. FIG. 10 is a serving gateway according to an embodiment of the present invention. As shown in FIG. 10, the serving gateway 100 includes the user plane congestion processing apparatus 102 of any of the above. In the embodiment, by processing the data packet in the S-GW or the SGSN, it is possible to effectively solve the above-mentioned congestion of the base station user plane, the base station processing capability congestion, and the link congestion between the base station and the S-GW. problem. The user plane congestion processing method provided in this embodiment mainly includes the following processes: S-GW sets multiple queues with different priorities for each accessed base station; when the user of the base station experiences user plane congestion, the congestion is performed. The information is notified to the S-GW. After receiving the downlink data packet whose destination address is the congestion base station, the S-GW distributes the data packet to the queue of the corresponding priority according to the priority of the data packet header, so as to reduce the transmission of the data packet to the base station. speed. It should be noted that when the S-GW sends downlink data to the base station, the priority in the GTP-U header can be removed. In addition, if the packet is full and the packet is lost, the S-GW returns an error indication to the P-GW, indicating that packet loss occurs, because the user is congested, and the P-GW may initiate a bearer modification process.

The S-GW can be configured to detect congestion on the user plane of the base station. For example, the user plane of the base station is congested, and the MME is notified, and the MME notifies the S-GW. The base station can directly notify the S-GW of user plane congestion through the user plane message. The base station may also notify the S-GW of user plane congestion through the network information collecting unit. Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 11 is a flowchart of a method for processing user plane congestion according to a preferred embodiment of the present invention. As shown in FIG. 11, the process includes the following steps: Step S1102: S-GW sets different priorities for each connected base station. Multiple queues; this queue is used on the S1-U interface of the S-GW to the base station. Step S1104: The PCRF sends the QoS policy to the P-GW, where the policy includes which QCIs of the user enable the priority flag, and the correspondence between the application and the priority. Generally, the P-GW is only for the default bearer.

The priority of different application packets on (QCI=8 or QCI=9) is not set for dedicated bearers. For the same application, different users may have different priorities, which can reflect the difference of the contract. The P-GW can also configure a universal priority setting policy for all users locally. Step S1106: When the P-GW receives the downlink data packet, the P-GW detects the application information of the data packet by using the deep packet check, according to the policy obtained from the PCRF, if necessary, the S5 of the data packet. /S8 Set the corresponding priority in the GTP-U header. Step S1108: The P-GW sends the GTP-U data packet to the S-GW. Step S1110: After the S-GW receives the downlink data packet sent from the P-GW, the S-GW changes the data packet header of the GTP-U to the GTP-U data packet header of the S1-U interface, and then passes the data packet through the S1. The -U interface is forwarded to the base station. The S-GW does not set a priority indication of the data packet. Step S1112: The base station performs QoS control according to the QCI corresponding to the bearer, and sends the data packet to the terminal by using an air interface. Step S1114: The base station detects that the user plane of the radio cell is congested. For example, if the radio resource is insufficient, the base station processing capability is insufficient, or the link between the base station and the S-GW is congested, the base station notifies the S-GW that user plane congestion occurs, and the specific information is notified. The method is as described in the above embodiments and preferred embodiments. Step S1116: After the S-GW receives the downlink data packet sent from the P-GW, the S-GW changes the data packet header of the GTP-U to the GTP-U data packet header of the S1-U interface, and determines whether the cache is needed. If necessary, the data packet is distributed to the queues with different priorities for buffering according to the priority indicated by the data packet header sent by the P-GW; if the downlink data packet does not indicate the priority, the S-GW is distributed to the default. The queue is processed. The S-GW can make the above judgment according to whether the destination address is an overloaded base station, or whether it is a specific user, and the user is located in a congested cell. Step S1118: The S-GW sends the buffered data packet to the base station according to the set different priorities. An example of an implementation is: There are two queues in the S-GW, queue 1 is high priority, and queue 2 is low priority. Correct For the data in queue 1, a packet is sent every T1. For the data in queue 2, a packet is sent every T2, where T2>T1 is set. Step S1120: The base station performs QoS control according to the QCI corresponding to the bearer, and sends the data packet to the terminal by using an air interface. By introducing a priority queue on the S-GW, the rate at which the S-GW sends downlink packets to the base station can be reduced, thereby alleviating user plane congestion of the base station; for the base station, the QoS processing is still performed according to the original QCI, and no additional is introduced. The user plane is processed, so it does not cause the user plane to be more congested; the mechanism can also effectively alleviate the link congestion between the base station and the S-GW by buffering the data packet. Therefore, the three possibilities mentioned in the related art can be effectively solved: 1) cell air interface radio resource congestion 2) base station processing capability congestion 3) link congestion between the base station and the S-GW. FIG. 12 is a flowchart of a method for an S-GW to learn user plane congestion on a base station according to an embodiment of the present invention. As shown in FIG. 12, the process includes the following steps: Step S1202: A base station determines that a user is about to occur in a certain cell. Congestion, then send a user plane overload notification to the MME, with the identity of the above cell. There are two implementations of the following steps. The first method is as follows: Step S1204a: The MME finds all users in the cell according to the cell identifier, and notifies the S-GW of the congestion information according to the user through the control plane message. Step S1206a, the S-GW starts a queuing mechanism for the user: distributing the downlink data packet to a buffer queue of a corresponding priority. The second mode is as follows: Step S1204b: The MME sends an overload message to the S-GW by controlling, where the message includes a base station identifier. Step S1206b: The S-GW enables the queuing mechanism for the base station: all downlink packets whose destination address is the base station are distributed to the buffer queue of the corresponding priority. Compared with the second method, the S-GW can accurately control the users in the overloaded cell, but also increases the MME's process of searching for all the uses in the cell, and increases the signaling load to the S-GW. FIG. 13 is a flowchart of a method for a user plane to learn user plane congestion on a base station according to an embodiment of the present invention. As shown in FIG. 13, the process includes the following steps: Step S1302: The base station determines that a user plane congestion is about to occur in the cell. Then, the user plane message is sent to the S-GW to notify the base station that the user is overloaded. The base station acquires all bearers of the users residing in the cell, and then each bearer sends a notification message, which is placed in the GTP-U message header of the data packet, or placed in the outer IP packet header, and brought to the S -GW. Step S1304: After receiving the S-GW, the S-GW learns that the user plane is congested, and then starts the user's caching mechanism: distribute the carried downlink data packet to the buffer queue of the corresponding priority. FIG. 14 is a flowchart of a method for an S-GW to learn that a user plane is congested by a base station according to an embodiment of the present invention, as shown in FIG. 14. A network information collection unit is set up in the network to collect some information in the mobile network. Step S1402: The base station determines that user plane congestion is about to occur, and reports user plane congestion to the network information unit. Step S1404: The S-GW knows from the network information unit whether the user base station currently connected has user plane congestion. Step S1406: If it is already congested, the corresponding queue function of the corresponding base station is used: All downlink data packets whose destination address is the base station are distributed to the buffer queue of the corresponding priority. If the base station user plane congestion has been alleviated, the base station can notify the S-GW in a similar manner. The S-GW does not enable the above-mentioned queuing mechanism and directly delivers data to the corresponding base station. 15 is a flowchart of a process for generating a queue overflow in an S-GW according to an embodiment of the present invention. As shown in FIG. 15, the process includes the following steps: Step S1502: When the S-GW caches data, if the data arrives very much Fast, will cause the queue to overflow. In step S1504, the S-GW discards the first-time data packet in the overflow queue according to the principle of first-in-first-out. Step S1506: The S-GW reports that the data is discarded to the P-GW, and the S-GW sends the number of lost data packets to the P-GW periodically to perform charging adjustment. The message can be sent via a control plane message or via a user plane message. Step S1508: The P-GW may interact with the PCRF to initiate a bearer modification process to reduce the bearer rate, thereby controlling the downlink bearer. FIG. 16 is a schematic structural diagram of an S-GW device according to an embodiment of the present invention. As shown in FIG. 16, the S-GW device includes the following structure: a control plane processing module 162: mainly responsible for control plane processing of the S-GW, Processing the GTP-C message of the S-GW to the MME and the GTP-C message to the P-GW; the user plane processing module 164: is connected to the control plane processing module 162, and is mainly responsible for the user plane processing of the S-GW, and the main work is For the downlink data packet, replace the downlink GTP-U packet header on the S5/S8 interface with the downlink GTP-U packet header of the S1 interface. For the uplink data, replace the uplink GTP-U packet header on the S1 interface with S5/. Upstream GTP-U packet header on the S8 interface. For downstream packets, the module no longer sets the priority of the packet. The base station user plane congestion detection module 166 (functions as the first receiving module 42 and/or the determining module 94 described above): the module is a new module connected to the control plane processing module 162 and the user plane processing module 164, and the S-GW The control panel processing module or the user plane processing module knows whether the base station has user plane congestion, and if so, enables the cache queue module. The cache queue module 168 (functioning with the cache module 44 described above): The module is a new module connected to the base station user plane congestion detection module 166 and the user plane processing module 164, located on the S1 interface of the S-GW. The module is configured with a queue of different priorities for each base station. If the base station user plane congestion detection module 166 detects that the user plane congestion occurs in the cell of the base station, the S-GW is the user or base station designated by the base station or the MME according to the destination address. For the specified bearer, the buffer queue module 168 is called: the downlink data packet is distributed to the corresponding queue according to the priority set by the P-GW for buffering, and the data packet is delivered according to the corresponding priority. A preferred embodiment is: There are two queues in the cache queue module, queue 1 is high priority, and queue 2 is low priority. For the data in queue 1, a packet is sent every T1. For the data in queue 2, a packet is sent every T2, where T2>T1 is set. It should be noted that the above embodiments and preferred embodiments are directed to a 4G system and can be easily extended to a 3G system. For example, the SGSN has a control plane and a user plane, and an associated priority queue can be set in the SGSN. After the GGSN sets the priority of the data packet, if the SGSN finds that the user plane congestion occurs in the base station cell, the SGSN can perform corresponding buffer processing on the downlink data packet, thereby effectively alleviating the user plane congestion of the base station cell. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention. INDUSTRIAL APPLICABILITY As described above, a user plane congestion processing method, apparatus, and service gateway provided by an embodiment of the present invention have the following beneficial effects: Resolving the congestion of a base station processing capability when a base station user plane is congested in the related art, and The problem of link congestion between the base station and the S-GW, and thus, when the congestion occurs on the user plane of the base station, by reducing the rate at which the S-GW sends data packets to the base station, the radio resource congestion of the cell air interface is effectively solved, and the base station is not Additional processing is added, and the link between the base station and the S-GW is also effectively mitigated.

Claims

Claim

A user plane congestion processing method, including:

Receiving congestion information of user plane congestion at the base station;

And buffering the data packet according to the priority of the data packet sent to the base station; and sending the cached data packet according to the priority.

2. The method according to claim 1, wherein, according to the priority of the data packet delivered to the base station, buffering the data packet comprises:

Setting different queues according to different priorities of the data packets;

The data packet is cached according to the queue corresponding to the priority.

3. The method according to claim 1, wherein the data packet that is buffered according to the priority includes:

And setting a time interval for sending the data packet to the base station according to the priority; and sending the buffered data packet according to the time interval.

The method according to claim 1, wherein the congestion information of the user plane congestion is received by the base station by at least one of the following manners:

Receiving, by the control plane, the congestion information of the user plane being congested by the base station; receiving, by the user plane, the congestion information of the user plane being congested by the user plane; receiving the user plane congestion of the base station from the network information collection unit The congestion information.

The method of claim 4, wherein the receiving, by the control plane, the congestion information that the user base station is congested by the base station comprises:

And receiving, by the mobility management entity, the congestion information sent by the control plane message, where the congestion information carries a user identifier of a user in a cell under the base station where user plane congestion occurs; and/or,

And receiving, by the mobility management entity, the congestion information sent by the control plane message, where the congestion information carries a base station identifier of the base station where user plane congestion occurs.

The method according to any one of claims 1 to 5, wherein before the buffering the data packet according to the priority of the data packet delivered to the base station, the method further includes:

Receiving the data packet delivered to the base station;

Determining whether the data packet needs to be buffered by at least one of the following methods: if the determination result is yes, buffering the data packet: determining whether the destination address of the data packet is an overloaded base station; Whether the user corresponding to the data packet is located in a cell of the base station that is congested by the user plane.

7. A user plane congestion processing apparatus, comprising:

The first receiving module is configured to receive the congestion information of the user plane congestion at the base station, and the buffering module is configured to cache the data packet according to the priority of the data packet sent to the base station;

The sending module is configured to deliver the cached data packet according to the priority.

The device according to claim 7, wherein the cache module comprises: a first setting unit, configured to set different queues according to different priorities of the data packets;

The cache unit is configured to cache the data packet according to the queue corresponding to the priority.

9. The device according to claim 7, wherein the sending module comprises:

a second setting unit, configured to set a time interval for sending the data packet to the base station according to the different priority levels;

The sending unit is configured to send the cached data packet according to the time interval.

The device according to claim 7, wherein the first receiving module comprises at least one of the following: a first receiving unit, configured to receive, by using a control plane, the congestion information that is generated by the base station to be user plane congested;

a second receiving unit, configured to receive, by using a user plane, the congestion information that is generated by the base station to be user plane congested;

The third receiving unit is configured to receive, from the network information collecting unit, the congestion information that the base station generates user plane congestion.

The device according to claim 10, wherein the first receiving unit comprises: a first receiving subunit, configured to receive the congestion information sent by the mobility management entity by using a control plane message, where the congestion information carries a user identifier of a user in a cell under the base station where user plane congestion occurs; and / or,

The second receiving subunit is configured to receive the congestion information sent by the mobility management entity by using a control plane message, where the congestion information carries a base station identifier of the base station where user plane congestion occurs.

The device according to any one of claims 7 to 11, further comprising: a second receiving module, configured to receive the data packet delivered to the base station;

The determining module is configured to determine, by at least one of the following methods, whether to cache the data packet, and if the determination result is yes, buffer the data packet: determining whether the destination address of the data packet is excessive The load base station determines whether the user corresponding to the data packet is located in a cell of the base station that is congested by the user plane.

A service gateway S-GW, comprising the apparatus of any one of claims 7 to 12.