WO2012174728A1 - Method, gateway and system for obtaining time of timer - Google Patents

Abstract

A method, gateway and system for assigning time of a timer are provided by the invention. A method includes receiving a router request message transmitted from a terminal equipment, or a creating session request message transmitted from a mobility management network element, wherein the router request message or the creating session request message includes infrequent transmission characteristic information of the terminal equipment (101); assigning time for a timer according to the infrequent transmission characteristic information (102). Because the assigned time for the timer according to the infrequent transmission characteristic information is more than the default time of the timer, many unnecessary calls caused by router advertisement message are reduced, the waste of wireless channel resources and terminal equipment resources is avoided, and normal operation of network is ensured.

Description

 Method, gateway and system for acquiring timer time

 The present invention relates to the field of communications technologies, and in particular, to a method, a gateway, and a system for acquiring a timer time. Background technique

 With the advent of the mobile broadband era, users need to use broadband access services anytime, anywhere. When a User Equipment (User Equipment) that supports IPv6 (Internet Protocol Version 6) is connected to the network, the stateless address auto-configuration technology can be used to obtain the IPv6 address prefix from the network side, and the default router survives. Time and other information, and set accordingly. The default router lifetime indicates the time available for the default router relative to the UE. After the default lifetime of the default router expires, the UE cannot find the default router and cannot send upstream data.

 In the 3GPP (The 3rd Generation Partnership Project) network, RA (Router Advertisement, Router Advertisement) messages need to be sent periodically to ensure the correctness of the UE address information. After receiving the new RA message, the UE obtains the updated default router lifetime, which avoids the default router lifetime expiration and causes the default router information loss on the UE. Therefore, a timer is set on the network side, and an RA message is periodically sent to the UE, which includes information such as a default router lifetime.

Currently, the operator sets the same default timer time and the same default default router lifetime for all terminal devices on the network. With the popularity of, for example, MTC (Machine Type Communications) applications, there are a large number of terminal devices with infrequent transmission characteristics in the network, and thus there are a large number of unnecessary pagings caused by router advertisement messages in the network. This can result in wasted wireless channel resources and terminal device resources. Summary of the invention

 In order to reduce the number of unnecessary paging caused by the router advertisement message, to avoid the waste of the wireless channel resources and the terminal device resources, and to ensure the normal operation of the network, the embodiment of the invention provides a method, a gateway and a system for acquiring the timer time. And a method for processing infrequent transmission characteristic information and a mobility management network element, as follows:

 An embodiment of the present invention provides a method for acquiring a timer time, including:

 Receiving a router request message sent by the terminal device or a create session request message sent by the mobility management network element; the router request message or the create session request message includes infrequent transmission characteristic information of the terminal device;

 The timer time is allocated according to the infrequent transmission characteristic information.

 The embodiment of the present invention further provides a method for processing infrequent transmission characteristic information, including: receiving an attach request message sent by a terminal device, where the attach request message includes infrequent transmission characteristic information; or receiving a home location register or a home subscription server The subscription data of the sent terminal device, where the received subscription data includes infrequent transmission characteristic information;

 A create session request message is sent, the create session request message containing infrequent transfer characteristic information. Correspondingly, the embodiment of the present invention provides a gateway for acquiring a timer time, including: a receiving module, configured to receive a router request message sent by a terminal device or a create session request message sent by a mobility management network element; the router request message Or creating a session request message that includes infrequent transmission characteristic information of the terminal device;

 An allocation module, configured to allocate a timer time according to the infrequent transmission characteristic information.

 The embodiment of the invention further provides a mobility management network element for processing infrequent transmission characteristic information, including:

 a receiving module, configured to receive an attach request message sent by the terminal device, where the attach request message includes infrequent transmission characteristic information; or, receive the subscription data of the terminal device sent by the home location register or the home subscription server, and the received subscription data includes Frequent transmission of characteristic information;

a sending module, configured to send a create session request message, where the create session request message includes a non-frequency Complex transmission characteristics information.

 The embodiment of the present invention further provides a system for acquiring a timer time, including the foregoing gateway and a mobility management network element, where the mobility management network element sends a create session request message to the gateway, where the create session request message includes infrequent transmission characteristic information. .

 According to the foregoing technical solution, the embodiment of the present invention includes the infrequent transmission characteristic information of the terminal device by using the router request message sent by the terminal device or the creation session request message sent by the mobility management network element, and is allocated according to the infrequent transmission characteristic information. The timer time is reduced because the timer time allocated according to the infrequent transmission characteristic information is greater than the default timer time, which reduces the paging caused by a large number of unnecessary router advertisement messages, thereby avoiding waste of wireless channel resources and terminal equipment resources. The normal operation of the network. DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

 FIG. 1 is a schematic flowchart of a method for acquiring a timer time according to a first embodiment of the present invention; FIG. 2 is a schematic flowchart of a second method for acquiring a timer time according to Embodiment 1 of the present invention; FIG. 4 is a schematic flowchart of a fourth method for acquiring a timer time according to Embodiment 1 of the present invention; FIG. 5 is a schematic diagram of a first method for processing infrequent transmission according to Embodiment 2 of the present invention; Schematic diagram of the method of characteristic information;

 6 is a schematic flow chart of a second method for processing infrequent transmission characteristic information according to Embodiment 2 of the present invention;

 7 is a schematic flowchart of a method according to Embodiment 3 of the present invention;

8 is a schematic flowchart of a method according to Embodiment 4 of the present invention; 9 is a schematic flowchart of a method according to Embodiment 5 of the present invention;

 10 is a schematic structural diagram of a first gateway according to Embodiment 6 of the present invention;

 11 is a schematic structural diagram of a second gateway according to Embodiment 6 of the present invention;

 12 is a schematic structural diagram of a third gateway according to Embodiment 6 of the present invention;

 13 is a schematic structural diagram of a fourth gateway according to Embodiment 6 of the present invention;

 14 is a schematic structural diagram of a first mobility management network element according to Embodiment 7 of the present invention; FIG. 15 is a schematic structural diagram of a second mobility management network element according to Embodiment 7 of the present invention; . detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is only a part of the embodiments of the invention, not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any inventive effort are within the scope of the present invention.

 The serial numbers of the following embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

 In the following embodiments, the Infrequent Transmission characteristic indicates that, for example, the mobile terminal may perform communication on average every hour, and the meter reading terminal having infrequent transmission characteristics may perform communication for 10 hours, 1 day, or 1 week. In particular, the characteristics can be defined. Terminal devices below the threshold do not have infrequent transmission characteristics. The operator can set the threshold according to the specific conditions of the network.

In the following embodiments, the infrequent transmission characteristic information is information indicating that the terminal device has infrequent transmission characteristics. The information may be one or several infrequent transmission characteristic flags, such as Infrequent Mobile, Low Mobile, etc. It can be any periodic location update timer time, such as the Periodic Tracking Area Update timer value, the periodic location area i or the update timer time (Registration Area Update timer value), and the periodic routing area. The value of the service interval of the terminal device, the timer time that the terminal device wants to obtain, and the like, or the infrequent transmission characteristic flag and the periodic location. Update any combination of timer time, business interval, and so on. The examples herein do not become limitations on infrequent transmission characteristic information. It is foreseeable that with the development of protocols, standards, and specifications, any information capable of indicating that a terminal device has infrequent transmission characteristics can be infrequently defined as the present invention. Transfer characteristic information.

 In the following embodiments, the timer time indicates a time interval at which the network side periodically sends a router advertisement message to the terminal device.

 In the following embodiments, the default timer time is a timer time set by the operator for all terminal devices in the network, that is, the time interval of the router advertisement message sent by each terminal device in the network side network is the same. The default timer time is the timer time set by the operator for the general terminal device, that is, the terminal device that does not have the infrequent transmission feature, according to the specific conditions of the network. For example, most networks The default timer time is set to 56 minutes.

 In the following embodiments, the infrequent transmission characteristic timer time is a timer time that is preset by an operator or obtained by an operator policy and greater than a default timer time.

 In the following embodiments, the default router lifetime indicates the length of time that the default router is available to the terminal device. When the default router lifetime expires, the terminal device cannot find the default router and cannot send uplink data.

 The following is a detailed description in conjunction with the embodiments of the present invention.

 Embodiment 1

 FIG. 1 is a schematic flowchart of a method for acquiring a timer time according to Embodiment 1 of the present invention. As shown in FIG. 1, the process of this embodiment is specifically as follows:

101: Receive a router request message sent by the terminal device or a mobility generated by the mobility management network element. Establishing a session request message; the router request message or the create session request message includes infrequent transmission characteristic information of the terminal device;

 102: The timer time is allocated according to the infrequent transmission characteristic information.

 The timer value of the terminal device with the infrequent transmission feature is greater than the default timer time, and the specific value of the allocated timer time may be determined according to the carrier. Strategy, or the situation of the network.

 In this embodiment and the following embodiments, in different scenarios, the executed network entities may be different gateway devices. For example, a scenario based on the GTP (GPRS Tunneling Protocol) may be a PDN-GW (Packet Data Network Gateway); a scenario based on PMIP (Proxy Mobile IP), which may be S- GW (Serving Gateway, Yueliang Gateway).

 In this embodiment and the following embodiments, the terminal devices may be different in different scenarios. For example, UE, MN (Mobile Node), MS (Mobile Station, mobile station), etc.

 The method for allocating the timer time according to the infrequent transmission characteristic information specifically includes, but is not limited to, one of the following three methods or any combination:

 Manner 1: When the non-frequent transmission characteristic information includes the service interval of the terminal device, the timer time is allocated according to the service interval of the terminal device, and the allocated timer time is less than the service interval time of the terminal device.

 By assigning a timer time that is smaller than the service interval of the terminal device, when the user equipment performs the next service transmission, valid routing information (ie, routing information from the user equipment to the gateway) can be obtained to ensure correct transmission of the service.

 Manner 2: When the infrequent transmission characteristic information includes the periodic location update timer time, the timer time is allocated according to the periodic location update timer, and the allocated timer time is greater than or equal to the periodic location update timer time.

Since the allocated timer time is greater than or equal to the periodic position update timer time can be reduced The sending frequency of router advertisement messages reduces the occupation of air interface resources and saves power consumption of terminal devices. Manner 3: When the infrequent transmission characteristic information is a non-frequent transmission characteristic flag, the infrequent transmission characteristic timer time is obtained according to the infrequent transmission characteristic flag and the operator policy, and the infrequent transmission characteristic timer time is greater than the default timer time. ; The timer time is allocated, and the allocated timer time is equal to the acquired infrequent transmission characteristic timer time.

 According to the method of the third method, the timer time can be flexibly allocated according to the operator's policy; and, when the infrequent transmission characteristic information satisfies the conditions required for any combination of the above modes, a more reasonable and scientific timer time can be allocated. .

 In the third mode, the operator policy refers to a series of rules for how the network side receives different infrequent transmission characteristic flags and how the infrequent transmission characteristic timer time is obtained. Through these rules, the infrequent transmission can be obtained. The transmission characteristic timer time, the infrequent transmission characteristic timer time is greater than the default timer time.

 The non-frequent transmission characteristic timer is obtained according to the carrier policy. The scenario is as follows: Scenario 1: The network side presets an infrequent transmission characteristic timer time. When the infrequent transmission characteristic information is a non-frequent transmission characteristic flag, The timer time is allocated, and the allocated timer time is equal to the infrequent transmission characteristic timer time. In this scenario, there is only one carrier policy, that is, the non-frequent transmission characteristic flag is allocated regardless of the non-frequent transmission characteristic flag. Transmission characteristic timer time.

Scenario 2: The network side presets a correspondence table between the infrequent transmission characteristic flag and the infrequent transmission characteristic timer time, and can obtain the unique corresponding infrequent transmission characteristic timer time by identifying the infrequent transmission characteristic flag. When the frequent transmission characteristic information is a non-frequent transmission characteristic flag, the infrequent transmission characteristic flag is first identified, and then the infrequent transmission characteristic timer time is obtained through the correspondence table, and the timer time is finally allocated, and the allocated timer time is equal to that obtained through the correspondence table. Infrequent transmission characteristic timer time; in this scenario, there are multiple carrier policies, for example, policy 1: through the preset correspondence table, the terminal device with the frequent mobility flag obtains the first infrequent transmission characteristic timer time; Strategy 2: With a preset correspondence table, with a low mobility flag The terminal device obtains the second infrequent transmission characteristic timer time and the like.

 In other scenarios, for example, after obtaining the infrequent transmission characteristic flag, the infrequent transmission characteristic timer time can be obtained by obtaining the subscription data of the terminal device, calculating the infrequent transmission characteristic timer time according to the formula, and the like. limited.

 It can be seen that in some scenarios, or when multiple scenarios are mixed, multiple carrier policies exist. Specific infrequent transmission characteristic flags, such as infrequent mobility flags, low mobility flags, and combinations thereof, may be used to determine an operator policy and obtain an infrequent transmission characteristic timer time by the operator policy.

 Further, as shown in FIG. 2, the method for acquiring the timer time in this embodiment may further include the following steps:

 103: Generate a default router lifetime according to the allocated timer time;

 105: Send a router advertisement message to the terminal device, where the router advertisement message includes the generated default router lifetime.

 To ensure that the upstream data fails due to the expiration of the default router lifetime before the router advertisement message arrives, the generated default router lifetime is greater than the allocated timer time. The default router lifetime is generated according to the allocated timer time and sent to the terminal device through the router advertisement message. When the terminal device comes to the next router advertisement message, the upload data will not fail due to the default router lifetime failure.

The value of the default router lifetime in the router advertisement message is limited by the packet structure. When the timer time is set to be greater than 2 ¹⁶ seconds, the default router lifetime value can be set to a maximum value less than the timer time. This will cause the default. The router lifetime expires, and eventually the uplink data transmission fails.

 Therefore, this embodiment also provides a method for carrying a default router lifetime generated by the router advertisement message:

Optionally, as shown in FIG. 3, the method for obtaining a timer time in this embodiment may further include the following steps: 104a: In the reserved field of the router advertisement message, two bits are used to generate the unit of the default router lifetime.

 By using 2 bits in the reserved domain to indicate the unit of the default router lifetime, the default router lifetime that can be carried by the original router advertisement message can be expanded.

 It should be noted that the two bits are only specific examples in the embodiment. In actual application, one bit or three bits, or other number of bits, may be used to indicate the default router lifetime.

 Optionally, as shown in FIG. 4, the method for obtaining a timer time in this embodiment may further include the following steps:

 104b: In the router advertisement message, increase the extended time option and store the generated default router lifetime in the extended time option.

 By increasing the extended time option to store the generated default router lifetime, it also increases the default router lifetime that can be carried by the original router advertisement message.

 Through the combination of the above two methods, the default router lifetime that can be carried by the original router advertisement message can also be expanded. It can be foreseen that the combination of the above two methods can also store the time value with higher precision requirement and more complicated unit configuration. .

In this embodiment, the network side can allocate the timer time according to the infrequent transmission characteristic information by using the router request message sent by the terminal device or the creation session request message sent by the mobility management network element to include the infrequent transmission characteristic information of the terminal device. Since the timer time allocated according to the infrequent transmission characteristic information is greater than the default timer time, a large number of unnecessary paging caused by the router advertisement message are reduced, which can avoid waste of wireless channel resources and terminal equipment resources, and ensure normal network. run. In this embodiment, by using two bits in the reserved field of the router advertisement message to represent the unit of the time value or by adding an extended time option in the router advertisement message, the generated default router lifetime is greater than 2 ¹⁶ seconds. The default router lifetime can also be included in the router advertisement message, which avoids the default router lifetime expired and the uplink data transmission failure before the router advertisement message arrives. Embodiment 2

 FIG. 5 is a schematic flow chart of a method for processing infrequent transmission characteristic information provided by this embodiment, as shown in the figure, including:

 201: receiving an attach request message sent by the terminal device, where the attach request message includes infrequent transmission characteristic information; or receiving subscription data of the terminal device sent by the home location register or the home subscription server, where the received subscription data includes infrequent transmission Characteristic information;

 203: Send a create session request message, where the create session request message includes infrequent transfer characteristic information.

 The execution entity of the method is a mobility management network element.

 The subscription data of the terminal device sent by the home location register or the home subscription server may be sent actively or may be sent after the request.

 The infrequent transmission characteristic information included in the created session request message may not be completely equal to the infrequent transmission characteristic information included in the attached request message sent by the terminal device or the home location register or the terminal device sent by the home subscription server. The infrequent transmission characteristic information included in the subscription data may be extracted by transmitting a part of the received infrequent transmission characteristic information, or may be added with additional information.

 The step 201 may include: receiving an attach request message sent by the terminal device, where the attach request includes an infrequent transmission characteristic flag of the terminal device, a service interval time, a period tracking area update timer time, a period position area update timer time, and Receiving at least one of the periodic routing area update timer times; or receiving the subscription data of the terminal device sent by the home location register or the home subscription server, the subscription data including the infrequent transmission characteristic flag, the service interval time, and the periodic tracking area of the terminal device Updating at least one of a timer time, a cycle location area update timer time, and a periodic routing area update timer time.

 Further, as shown in FIG. 6, the method for processing infrequent transmission characteristic information provided by this embodiment may further include:

202: 4: Generate new infrequent transmission characteristic information according to the operator generation policy. The operator generation policy refers to the infrequent transmission characteristic information included in the attachment request message sent by the received terminal device or the infrequent transmission characteristic information included in the home location register or the subscription data of the terminal device sent by the home subscription server. , How to generate a new set of rules for infrequent transfer of feature information.

 The infrequent transmission characteristic information included in the created session creation request message is generated new infrequent transmission characteristic information.

 The method provided in this embodiment obtains the infrequent transmission characteristic information of the terminal device by using the attach request message sent by the terminal device or the subscription data sent by the home location register or the home subscription server, and directly transmits or passes the infrequent transmission characteristic information. After processing, it is sent out, which is convenient for the third embodiment.

 FIG. 7 is a schematic flow chart of a method according to Embodiment 3 of the present invention. This embodiment is based on a GTP scenario, in which the P匪-GW performs a router function, allocates an IPv6 address prefix to the UE, and allocates a timer time and a default router lifetime. In the scenario of the embodiment, the infrequent transmission characteristic timer time is preset for the terminal device having the infrequent transmission characteristic, and when the request message includes the infrequent transmission characteristic information, the timer time is allocated, and the allocated timer time is allocated. It is equal to the infrequent transmission characteristic timer time, and then generates the default router lifetime according to the allocated timer time, and sends it to the terminal device through the router advertisement message. As shown in Figure 7, the specific process of this embodiment is as follows:

 301: setting an infrequent transmission characteristic timer time on the PDW-GW;

Specifically, the infrequent transmission characteristic timer time for the UE having the infrequent transmission characteristic is preset on the PDN-GW, where the infrequent transmission characteristic timer time may be according to most terminal devices in the network that have infrequent transmission characteristics. The distribution of communication intervals depends on the distribution. For example, the default timer time set for a normal UE on the P匪-GW is 30 minutes, and the communication interval of the UE with infrequent transmission characteristics under the network is mostly more than 5 hours, for infrequent transmission characteristics. For the UE, there may be 4-5 RA pagings in the communication interval, and the infrequent transmission characteristic timer can be set to 3 hours or 4 hours, etc., thereby reducing the infrequent The number of times the router of the transmission characteristic broadcasts the message of the router announcement message during its communication interval. According to different network requirements, an appropriate interval time can be selected as the infrequent transmission characteristic timer time, so that most UEs with infrequent transmission characteristics have only 1-2 RA pages during their communication interval.

 302: The UE sends an attach request to the MME.

 Specifically, the UE with the infrequent transmission feature may include the infrequent transmission characteristic information when transmitting the request attached to the network, indicating that the UE has a long interval between each communication, and wants to allocate a long timer time. . In addition, the MN can learn the subscription data of the UE from the home subscription server, and the subscription data includes the infrequent transmission characteristic information.

 303: The MN sends a create session request carrying the information of the infrequent transmission characteristic, and sends the request to the P匪-GW through the S-GW.

 Specifically, the MME receives the attach request message sent by the UE, and creates a request for the bearer type that supports the IPv6 bearer. When the MME detects that the request of the UE carries the infrequent transmission characteristic information or the subscription data of the UE includes the infrequent transmission characteristic information, The E-input transmission of the infrequent transmission characteristic information in the creation session request or the generation of the new infrequent transmission characteristic information by the operator generation policy is carried in the creation session request, and is sent to the PDN-GW through the S-GW, where the non-frequent The transmission characteristic information may include a non-frequent transmission characteristic flag, a service interval time, a periodic tracking area update timer time, a periodic position area update timer time, a periodic routing area update timer time, and the like.

 304: The PDN-GW sends a session creation response message, and sends it to the MN through the S-GW.

 Specifically, after receiving the create session request sent by the MME, the P匪-GW allocates the required bearer resource to the UE, and sends a create session response message to the MME. At the same time, the P匪-GW detects whether the request carries the infrequent transmission characteristic information, and if the infrequent transmission characteristic information is carried, the synchronization starts execution 306.

 305: The MME sends an attach accept message to the UE.

Specifically, after receiving the create session response message sent by the PDN-GW, the MN sends an attach accept message to the UE, indicating that the network side has allocated a corresponding bearer resource for the UE for data transmission of the UE. 306: The PDN-GW allocates a timer time, and the allocated timer time is equal to the infrequent transmission characteristic timer time, and generates a default router lifetime;

 Specifically, when the creation session response request received by the P匪-GW carries the infrequent transmission characteristic information, the timer time is allocated, and the allocated timer time is equal to the infrequent transmission characteristic timer time. The allocated timer time of this embodiment indicates the interval at which the P匪-GW sends an RA message to the UE. After the timer time is allocated, the default router lifetime is generated according to the allocated timer time, so that the UE does not fail the uplink data due to the expiration of the default router lifetime before the RA message sent by the P匪-GW arrives.

 Optionally, the UE may also send an RS message to the P匪-GW to obtain the RA message sent by the PDN-GW. As shown in 307 in Figure 7:

 307: The UE sends an RS message to the P匪-GW;

 308: The P-GW sends an RA message carrying the generated default router lifetime to the UE. Specifically, the P-GW sends an RA message carrying the generated default router lifetime to the UE. Generally, the RA is in the RA. There are 16 bits in the message's Rou t er L i fe T ime field to record the value of the generated default router lifetime, but when the default router lifetime is more than the value range indicated by 16 bits, As a result, the timer time is greater than the default router lifetime, which may cause the UE to upload data. Therefore, this embodiment also provides two methods for carrying the generated default router lifetime in the RA message:

 Method 1: In the reserved field of the RA message, two bits are used to describe the unit of the generated default router lifetime;

 For example, in the following RA message, the bit where X and Y are located is used to indicate the unit of the generated default router lifetime.

 8 bits 8 bits 16 bits

 Type code check value

 Cur Hop L imi t M 0 X Y Reserved Domain Router Lifetime

Time to reach Retransmission timer

 Option

 Where X is in the 3rd bit of the 6th byte of the RA message, Y is in the 4th bit of the 6th byte of the RA message, and the reserved field becomes the 5th of the 6th byte. Bits to the 8th bit.

 Among them, the X, Y bit combination can be defined as follows:

 a) X=0, Y=0, indicating that the unit is second;

 b) X=0, Y=0, indicating that the unit is minutes;

 c) X=0, Y=0, indicating that the unit is hour;

 d) X=0, Y=0, indicating that the unit is day.

 The above-mentioned X, Υ bit selection and bit bit combination are only used as a general reference, and do not constitute a limitation on the technical solution. In practice, it can be defined as needed.

 By setting the unit of the generated default router lifetime, you can greatly increase the range of time that can be represented. Defining X=0, Y=0 is defined as seconds, which is convenient for compatibility with existing systems.

 Method 2: Add an extended time option to the RA message;

 For example, the structure of the new extended time option is:

Specifically, the router lifetime time domain has 32 bits, and the range that can be represented is 0 - 2 ³² seconds. The router can send this option to the UE in the option field of the RA.

 The definition of the above options is for general reference only and does not constitute a limitation on the technical solution. In fact, it can be defined as needed.

By setting the extended time option, you can store time values in excess of 2 ¹⁶ seconds in the RA message. In this embodiment and the following embodiments, the terminal device carries the infrequent transmission characteristic by using an attach message. The information is sent to the MN, or the MN receives the infrequent transmission characteristic information of the terminal device from the home subscription server after receiving the attachment message. In fact, there are other ways to enable the MN to obtain the infrequent transmission characteristic information of the terminal device, for example. The infrequent transmission feature of the terminal device can be obtained from the application server, and the infrequent transmission characteristic of the terminal device can be obtained from a specific UE feature message, which can be detected from a DPI (Deep Packet Inspect IO) device. As a result, the infrequent transmission characteristics of the terminal device are acquired, and the like.

 The technical solution of this embodiment is also applicable to a PMPI scenario. In the PMPI scenario, the S-GW performs the function of the router, assigns an IPv6 address prefix to the UE, and sets an appropriate timer time and default router lifetime.

In this embodiment, the infrequent transmission characteristic timer is set in advance. When the session request message carries the infrequent transmission characteristic message, the allocated timer time is equal to the infrequent transmission characteristic timer time, that is, the infrequent transmission characteristic timing is The device time is used as the interval for the P-GW to send the RA message to the UE, and the default router lifetime is generated. Finally, the generated default router lifetime is sent to the UE, because the timer time allocated according to the infrequent transmission characteristic information is greater than the default. The provincial timer time reduces a large number of unnecessary paging caused by router advertisement messages, which can avoid waste of wireless channel resources and terminal equipment resources, and ensure normal operation of the network. In this embodiment, when the generated default router lifetime is greater than 2 ¹⁶ seconds, it is avoided by using two bits in the reserved field of the RA message to represent the unit of the time value or by adding an extended time option in the RA message. Before the RA message arrives, the default router lifetime expires and the uplink data transmission fails.

 Embodiment 4:

FIG. 8 is a schematic flow chart of a method according to Embodiment 4 of the present invention. This embodiment is based on a GTP scenario, in which the P匪-GW performs a router function, allocates an IPv6 address prefix to the UE, and sets a timer time and a default router lifetime. In the scenario of the embodiment, the correspondence table between the infrequent transmission characteristic flag and the preset infrequent transmission characteristic timer time is preset for the terminal device having the infrequent transmission characteristic, and the request message has the infrequent transmission characteristic flag. When obtaining the right and wrong through the correspondence table The infrequent transmission characteristic timer time corresponding to the frequent transmission characteristic flag, the timer time allocated, the allocated timer time is equal to the obtained infrequent transmission characteristic timer time, and the default router survival is generated according to the allocated timer time. Time, and sent to the terminal device through the RA message. As shown in FIG. 8, the specific process of this embodiment is as follows:

 401: Set a correspondence table between the infrequent transmission characteristic flag and the preset infrequent transmission characteristic timer time on the P匪-GW, and obtain a unique corresponding non-frequency transmission characteristic timer time by identifying the infrequent transmission characteristic flag;

Specifically, a correspondence table between the infrequent transmission characteristic flag of the UE having the infrequent transmission characteristic and the preset infrequent transmission characteristic timer time is preset on the PDN-GW, where the infrequent transmission characteristic flag may be a single flag information. Or a combination of multiple flag information, the flag information may be a non-frequent mobility flag or a low mobility flag; for example, the definition is as follows:

 The definition of the above-mentioned correspondence table is only for general reference, and does not constitute a limitation on the technical solution. In practice, it can be defined as needed.

 Through the correspondence table, different infrequent transmission characteristic flags can be configured to obtain different preset infrequent transmission characteristic timer times.

 In addition, when the infrequent transmission characteristic information includes the infrequent transmission characteristic flag and the periodic location update timer time, the embodiment may further set a correspondence table between the time interval and the preset infrequent transmission characteristic timer time, and determine the period by The time interval in which the sexual location update timer time is located can obtain a unique corresponding preset infrequent transmission characteristic timer time.

 402: The UE sends an attach request to the MME.

Specifically, the UE with the non-frequent transmission feature may carry the infrequent transmission characteristic flag when transmitting the request attached to the network, indicating that the UE has a long interval of communication each time, and wants to allocate a long timer time. . In addition, after receiving the attach request message, the MN may obtain the UE from the home subscription server regardless of whether the attach request message includes infrequent transmission characteristic information. The contract data includes the infrequent transmission characteristic flag.

 403: 丽 E sends a create session request message carrying the infrequent transmission feature flag, and passes through the S-GW to the P匪-GW;

 Specifically, the MME receives the attach request message sent by the UE, and creates a request for the bearer type that supports the IPv6 bearer. When the MME detects that the request of the UE carries the infrequent transmission characteristic flag or the subscription data of the UE includes the infrequent transmission characteristic flag, The E-instance carries the infrequent transmission characteristic flag in the creation session request or generates a new infrequent transmission characteristic flag generated by the operator generation policy in the creation session request, and sends it to the P匪_GW through the S-GW.

 404: P匪 _GW sends a create session response message, and passes through the S-GW to the MME;

 Specifically, after receiving the create session request sent by the MME, the P匪-GW allocates the required bearer resource to the UE, and sends a create session response message to the MME. At the same time, the P匪-GW detects whether the request carries the infrequent transmission characteristic flag, and if the infrequent transmission characteristic flag is carried, the synchronization starts execution 406.

 405: The MME sends an attach accept message to the UE.

 Specifically, after receiving the create session response message sent by the PDN-GW, the MN sends an attach accept message to the UE, indicating that the network side has allocated corresponding bearer resources for the UE for data transmission of the UE.

 406: The PDN-GW identifies the infrequent transmission characteristic flag, obtains a preset infrequent transmission characteristic timer time corresponding to the identified infrequent transmission characteristic flag, allocates a timer time, and allocates a timer time equal to the acquired time. Infrequent transmission characteristic timer time, which generates a default router lifetime according to the allocated timer time;

Specifically, when the non-frequent transmission characteristic flag is carried in the creation session response request received by the P-GW, the acquired infrequent transmission characteristic flag is identified, and the preset corresponding to the infrequent transmission characteristic flag is obtained through the foregoing correspondence table. Infrequently transmitting the characteristic timer time, and allocating the timer time, the allocated timer time is equal to the acquired infrequent transmission characteristic timer time, that is, the interval at which the P匪-GW sends the RA message to the UE is equal to the acquired infrequent transmission. Feature timer time. Assignment After the timer time, the default router lifetime is generated according to the assigned timer to ensure that each time

Before the RA message sent by the P匪-GW arrives, the UE will not fail the uplink data because the default router lifetime expires.

 In addition, when the infrequent transmission characteristic information includes the infrequent transmission characteristic flag and the periodic location update timer time, the embodiment may further determine a time interval in which the periodic location update timer time is located, and obtain a time interval corresponding to the time interval by using the correspondence table. The preset infrequent transmission characteristic timer time, the allocated timer time, and the allocated timer time are equal to the corresponding preset infrequent transmission characteristic timer time.

 Optionally, the UE may also send an RS message to the P匪-GW to obtain the RA message sent by the PDN-GW. As shown at 407 in Figure 8:

 407: The UE sends an RS message to the P匪-GW;

 408: The P-GW sends an RA message carrying the generated default router lifetime to the UE. Generally, 16 bits in the router lifetime time domain of the RA message can record the generated default router lifetime, but When the generated default router lifetime exceeds the value range indicated by 16 bits, there are two methods for carrying the generated default router lifetime:

 Method 1: In the reserved field of the RA message, two bits are used to describe the unit of the generated default router lifetime;

 Method 2: Add an extended time option to the RA message;

 For a specific method, reference may be made to Embodiment 3, and details are not described herein.

 The technical solution of this embodiment is also applicable to a PMPI scenario. In the PMPI scenario, the S-GW performs the function of the router, assigns an IPv6 address prefix to the UE, and sets an appropriate timer time and default router lifetime.

In this embodiment, by setting a correspondence table between the infrequent transmission characteristic flag and the infrequent transmission characteristic timer time in advance, it is possible to obtain a unique corresponding infrequent transmission characteristic timer time by identifying the non-frequent transmission characteristic flag, when creating a session request message. Infrequent transmission characteristic flag The time of the timer is allocated, the timer time is allocated, and the allocated timer time is equal to the acquired infrequent transmission characteristic timer time. The infrequent transmission characteristic timer time obtained by the correspondence table is used as the P匪-GW to send the RA message to the UE. Interval, and the default router lifetime is generated according to the allocated timer time. Finally, the generated default router lifetime is sent to the UE. The timer time allocated according to the infrequent transmission characteristic information is greater than the default timer time. Unnecessary paging caused by router advertisement messages can avoid waste of wireless channel resources and terminal equipment resources, and ensure normal operation of the network.

 Embodiment 5

 FIG. 9 is a schematic flow chart of a method according to Embodiment 5 of the present invention. This embodiment is based on a GTP scenario, in which the P匪-GW performs a router function, allocates an IPv6 address prefix to the UE, and sets an appropriate timer time and a default router lifetime. In the scenario of the embodiment, the non-frequent transmission characteristic information in the request message includes a periodic location update timer time and/or a service interval time, and the timer time is allocated according to the periodic location update timer time and/or the service interval time. Then, the default router lifetime is generated according to the allocated timer time, and is sent to the terminal device through the RA message. The allocated timer time in this embodiment is the timer time allocated by the PDN-GW to the UE, and the generated default router lifetime is P默认-GW is the default router lifetime allocated to the UE. As shown in Figure 9, the specific process of this embodiment is as follows:

 501: The UE sends an attach request to the MME.

 Specifically, the UE with the infrequent transmission feature may carry the periodic location update timer time and/or the service interval time when transmitting the request attached to the network, indicating that the UE has a long interval of communication each time. In addition, the MN can learn the subscription data of the UE from the home subscription server, and the subscription data includes the periodic location update timer time and/or the service interval time of the infrequent transmission characteristic.

502: The MME sends a create session request message carrying a periodic location update timer time and/or a service interval time, and passes through the S-GW to the P匪-GW. Specifically, the MME receives the attach request message sent by the UE, and the MME detects that the request of the UE carries the periodic location update timer time and/or the service interval time or the subscription data of the UE. When the periodic location update timer time and/or the service interval time are included, the MME carries the periodic location update timer time and/or the service interval time in the create session request or generates a new periodicity by using the operator generation policy. The location update timer time and/or the service interval time are carried in the create session request and sent to the P匪-GW through the S-GW.

 503: P匪 _GW sends a create session response message, and passes through the S-GW to the MME.

 Specifically, after receiving the create session request sent by the MME, the P匪-GW allocates the required bearer resource to the UE, and sends a create session response message to the MME. At the same time, the P匪-GW detects whether the request carries a combination of the identification information of the infrequent transmission characteristic and the time value. If the periodic location update timer time and/or the service interval time is carried, the synchronization starts execution 505.

 504: The MME sends an attach accept message to the UE.

 Specifically, after receiving the create session response message sent by the PDN-GW, the MN sends an attach accept message to the UE, indicating that the network side has allocated corresponding bearer resources for the UE for data transmission of the UE.

 505: Allocate a timer time according to a periodic location update timer time and/or a service interval time, and generate a default router lifetime according to the allocated timer time;

 Specifically, when the periodic session update timer time and/or the service interval time are received in the create session response request received by the P匪-GW, the timer time is allocated, as follows:

 When the infrequent transmission characteristic information includes the service interval of the terminal device, the timer time is allocated, and the allocated timer time is less than the service interval time of the terminal device;

 When the infrequent transmission characteristic information includes the periodic location update timer time, the timer time is allocated, and the allocated timer time is greater than or equal to the periodic location update timer time;

 The periodic location update timer time includes a periodic tracking area update timer time, a periodic location area update timer time, a periodic routing area update timer time, and the like.

The timer time allocated in this embodiment indicates the interval at which the P-GW sends an RA message to the UE. After the timer time is allocated, the default router lifetime is generated according to the allocated timer time to ensure that the UE does not fail the uplink data due to the expiration of the default router lifetime before the RA message sent by the P-GW.

 Optionally, the UE may also send an RS message to the P匪-GW to obtain the RA message sent by the PDN-GW. As shown at 506 in Figure 9:

 506: The UE sends an RS message to the P匪-GW.

 507: The P匪-GW sends an RA message carrying the generated default router lifetime to the UE; in general, 16 bits in the router lifetime time domain of the RA message can record the generated default router lifetime value, but When the generated default router lifetime exceeds the value range indicated by 16 bits, there are two methods for carrying the generated default router lifetime:

 Method 1: In the reserved field of the RA message, two bits are used to describe the unit of the generated default router lifetime;

 Method 2: Add an extended time option to the RA message;

 For a specific method, reference may be made to Embodiment 3, and details are not described herein.

 The technical solution of this embodiment is also applicable to a PMPI scenario. In the PMPI scenario, the S-GW performs the function of the router, assigns an IPv6 address prefix to the UE, and sets an appropriate timer time and default router lifetime.

 In this embodiment, the request message includes the periodic location update timer time and/or the service interval time, and the timer time is allocated according to the periodic location update timer time and/or the service interval time. - The interval at which the GW sends the RA message to the UE, and generates a default router lifetime according to the allocated timer time, and finally sends the generated default router lifetime to the UE, because the timer time allocated according to the infrequent transmission characteristic information is greater than The default timer time reduces a large number of unnecessary paging caused by router advertisement messages, which can avoid waste of wireless channel resources and terminal equipment resources, and ensure normal operation of the network.

Embodiment 6 FIG. 10 is a schematic structural diagram of a first gateway according to Embodiment 6 of the present invention. As shown in FIG. 10, the gateway includes:

 The receiving module 601 is configured to receive a router request message sent by the terminal device or a create session request message sent by the mobility management network element; the router request message or the create session request message includes infrequent transmission characteristic information of the terminal device;

 The allocating module 602 is configured to allocate a timer time according to the infrequent transmission characteristic information.

 The timer time allocated by the allocation module can reduce the frequency at which the network side sends the router advertisement message to the terminal device, and reduces a large number of unnecessary paging caused by the router advertisement message.

 Optionally, the allocating module 602 is further configured to allocate a timer time according to a service interval of the terminal device, where the allocated timer time is less than a service interval time of the terminal device.

 Optionally, the allocating module 602 is further configured to update the timer time according to the periodic location, and the allocated timer time is greater than or equal to the periodic location update timer time.

 Optionally, as shown in FIG. 11, the allocating module 602 may further include:

 The obtaining module 602a is configured to obtain an infrequent transmission characteristic timer time according to the infrequent transmission characteristic flag and the operator policy.

 The first allocation module 602b is configured to allocate a timer time, and the allocated timer time is equal to the acquired infrequent transmission characteristic timer time.

 Further, the obtaining module 602a may include:

 A determining module 602a-l for determining a carrier policy based on the infrequent mobility flag and/or the low mobility flag;

 The first obtaining module 602a-2 is configured to obtain an infrequent transmission characteristic timer time according to the determined operator policy.

 Further, as shown in FIG. 12, the gateway may further include:

The generating module 603 is configured to generate a default router lifetime according to the allocated timer time. The sending module 604 is configured to send a router advertisement message to the terminal device, where the router advertisement message includes the generated default router lifetime. Optionally, as shown in FIG. 13, the generating module 603 includes:

 The unit module 603a is configured to generate a unit of a default router lifetime by using two bits in a reserved field of the router advertisement message; or

 Option module 603b, used to add an extended time option in the router advertisement message, and store the generated default router lifetime in the extended time option.

 The gateway of the embodiment, by processing the terminal infrequent transmission characteristic information, allocates a timer time greater than the default timer time to the terminal device having the infrequent transmission characteristic, and reduces a large number of unnecessary router advertisement messages. The paging can avoid the waste of wireless channel resources and terminal equipment resources, and ensure the normal operation of the network.

 Example 7

 As shown in FIG. 14, this embodiment provides a mobility management network element, including:

 The receiving module 701 is configured to receive an attach request message sent by the terminal device, where the attach request message includes infrequent transmission characteristic information; or, receive the subscription data of the terminal device sent by the home location register or the home subscription server, and the received subscription data The infrequent transmission characteristic information is included; the sending module 703 is configured to send a create session request message, where the create session request message includes infrequent transmission characteristic information.

 As shown in FIG. 15, further, the mobility management network element further includes:

 The generating module 702 is configured to generate new infrequent transmission characteristic information according to the operator generation policy. The infrequent transmission characteristic information included in the creation session request message sent by the sending module 703 is a new infrequent transmission characteristic generated by the generating module 702. information.

 Further, the receiving module 701 is specifically configured to receive an attach request message sent by the terminal device, where the attach request message includes an infrequent transmission characteristic flag of the terminal device, a service interval time, a periodic tracking area update timer time, and a periodic location area update timer. At least one of a time and period routing area update timer time; or,

The receiving module 701 is specifically configured to receive the subscription data of the terminal device sent by the home location register or the home subscription server, where the subscription data includes the infrequent transmission characteristic flag and service of the terminal device. At least one of an interval time, a period tracking area update timer time, a period position area update timer time, and a periodic routing area update timer time.

 The mobility management network element of this embodiment passes the processing for the final infrequent transmission characteristic information, and the eighth embodiment

 This embodiment is an embodiment of a system for acquiring timer time. As shown in FIG. 16, the system may include a gateway specifically shown in any of FIG. 10 to FIG. 13 and a mobility management network element shown in any of FIG. 14 to FIG. 15, and the mobility management network element sends a creation session to the gateway. A request message, the create session request message contains infrequent transfer characteristic information.

In this embodiment, by including a gateway that acquires a timer time in the system and a timer time for processing the inefficient transmission of the special timer time, a large number of unnecessary paging caused by the router advertisement message are reduced, and the wireless channel resource and the wireless channel resource can be avoided. The waste of terminal equipment resources ensures the normal operation of the network. The network side can allocate the timer time according to the infrequent transmission characteristic information and generate the default router lifetime, because the timer time allocated according to the infrequent transmission characteristic information is greater than the default timer time, and a large number of unnecessary routers are reduced. The paging caused by the announcement message can avoid the waste of wireless channel resources and terminal equipment resources, and ensure the normal operation of the network. In the embodiment of the present invention, when the generated default router lifetime is greater than 2 ¹⁶ seconds, by using two bits in the reserved field of the RA message to represent the unit of the time value or by adding an extended time option in the RA message, Before the RA message arrives, the default router lifetime expires and the uplink data transmission fails.

 It will be understood by those of ordinary skill in the art that the drawings are only a schematic representation of one embodiment, and the modules or processes in the drawings are not necessarily required to practice the invention.

A person skilled in the art may understand that the modules in the gateway in the embodiment may be distributed in the gateway of the embodiment according to the embodiment, or may be changed according to the embodiment. One or more gateways. The modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

 A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

 It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are replaced by equivalents; and the modifications or substitutions do not deviate from the spirit of the technical solutions of the embodiments of the present invention. range.

Claims

Claim  A method for obtaining a timer time, comprising:  Receiving a router request message sent by the terminal device or a create session request message sent by the mobility management network element; the router request message or the create session request message includes non-frequency transmission characteristic information of the terminal device;  The timer time is allocated according to the infrequent transmission characteristic information.  The method according to claim 1, wherein the infrequent transmission characteristic information includes a service interval time of the terminal device, and the allocating the timer time according to the infrequent transmission characteristic information includes:  And allocating the timer time according to the service interval time of the terminal device, where the allocated timer time is less than the service interval time of the terminal device.  The method according to claim 1, wherein the infrequent transmission characteristic information includes a periodic location update timer time, and the scheduling time according to the infrequent transmission characteristic information includes:  The timer time is allocated according to the periodic location update timer time, and the allocated timer time is greater than or equal to the periodic location update timer time.  The method according to claim 1, wherein the infrequent transmission characteristic information is a non-frequent transmission characteristic flag, and the allocating a timer time according to the infrequent transmission characteristic information comprises: according to the infrequent transmission characteristic The flag and the carrier policy obtain the infrequent transmission characteristic timer time;  The timer time is allocated, and the allocated timer time is equal to the acquired infrequent transmission characteristic timer time. The method of claim 4, wherein the obtaining the infrequent transmission characteristic timer time according to the infrequent transmission characteristic flag and the operator policy comprises: acquiring the non-according according to the operator policy The feature timer is transmitted frequently. The method according to claim 1, wherein the method further comprises: generating a default router lifetime according to the allocated timer time;  And sending a router advertisement message to the terminal device, where the router advertisement message includes the generated default router lifetime.  The method according to claim 6, wherein before the sending the router advertisement message to the terminal device, the method further includes:  Generating, in the reserved field of the router advertisement message, two units of bits to generate a unit of the generated default lifetime of the default router; or  In the router advertisement message, an extended time option is added, and the generated default router lifetime is stored in the extended time option.  8. A method for processing infrequent transmission characteristic information, comprising:  Receiving an attach request message sent by the terminal device, where the attach request message includes the infrequent transmission characteristic information; or receiving the subscription data of the terminal device sent by the home location register or the home subscription server, and the received subscription data The infrequent transmission characteristic information is included; a create session request message is sent, where the create session request message includes the infrequent transmission characteristic information.  The method according to claim 8, wherein the method further comprises:  Generating new infrequent transmission characteristic information according to the operator generation policy;  The infrequent transmission characteristic information included in the create session request message is the generated new non-frequent transmission characteristic information.  The method of claim 8, wherein the receiving the request message sent by the terminal device or the receiving the home location register or the subscription data of the terminal device sent by the home subscription server comprises: Receiving an attach request message sent by the terminal device, where the attach request message includes an infrequent transmission characteristic flag, a service interval time, a periodic tracking area update timer time, a periodic location area update timer time, and a periodic routing area update of the terminal device. At least one of the timer times; or,  Receiving subscription data of the terminal device sent by the home location register or the home subscription server, where the subscription data includes the infrequent transmission characteristic flag, the service interval time, the periodic tracking area update timer time, and the periodic location area update of the terminal device At least one of a timer time and a periodic routing area update timer time.  A gateway for obtaining a timer time, comprising:  a receiving module, configured to receive a router request message sent by the terminal device or a create session request message sent by the mobility management network element; the router request message or the create session request message includes infrequent transmission characteristic information of the terminal device;  And an allocating module, configured to allocate a timer time according to the infrequent transmission characteristic information.  12. The gateway of claim 11 wherein:  The allocating module is configured to allocate the timer time according to the service interval of the terminal device, where the allocated timer time is less than the service interval time of the terminal device.  13. The gateway of claim 11 wherein:  The allocating module is specifically configured to allocate the timer time according to a periodic location update timer time, where the allocated timer time is greater than or equal to the periodic location update timer time.  The gateway according to claim 11, wherein the allocation module comprises: an obtaining module, configured to acquire an infrequent transmission characteristic timer time according to the infrequent transmission characteristic flag and the operator policy;  And a first allocation module, configured to allocate the timer time, where the allocated timer time is equal to the acquired infrequent transmission characteristic timer time.  The gateway according to claim 14, wherein the obtaining module comprises: a determining module, configured to determine an operator policy according to the infrequent mobility flag and/or the low mobility flag; The first obtaining module is configured to acquire the infrequent transmission characteristic timer time according to the operator policy. The gateway according to claim 11, wherein the gateway further comprises: a generating module, configured to generate a default router lifetime according to the allocated timer time; and a sending module, configured to send a router advertisement message To the terminal device, the router advertisement message includes the generated default router lifetime.  The gateway according to claim 16, wherein the generating module further comprises: a unit module, configured to generate the generated default router by using two bits in a reserved field of the router advertisement message Unit of survival time; or,  And an option module, configured to add an extended time option in the router advertisement message, where the generated default router lifetime is stored in the extended time option.  18. A mobility management network element for processing infrequent transmission characteristic information, comprising:  a receiving module, configured to receive an attach request message sent by the terminal device, where the attach request message includes the infrequent transmission characteristic information; or, receiving, by the home location register or the subscription data of the terminal device sent by the home subscription server, The received subscription data includes the infrequent transmission characteristic information;  And a sending module, configured to send a create session request message, where the create session request message includes the infrequent transfer characteristic information.  The mobility management network element according to claim 18, further comprising: a generating module, configured to generate new infrequent transmission characteristic information according to the operator generation policy; and create a session request sent by the sending module The infrequent transmission characteristic information included in the message is the generated new infrequent transmission characteristic information.  20. The mobility management network element of claim 18, wherein: The receiving module is specifically configured to receive an attach request message sent by the terminal device, where the attach request message includes an infrequent transmission characteristic flag, a service interval time, a periodic tracking area update timer time, and a periodic location area update timing of the terminal device. At least one of a timer time and a periodic routing area update timer time; or The receiving module is specifically configured to receive the subscription data of the terminal device sent by the home location register or the home subscription server, where the subscription data includes the infrequent transmission characteristic flag, the service interval time, and the periodic tracking area update timing of the terminal device. At least one of a timer time, a periodic location area update timer time, and a periodic routing area update timer time.  A system for acquiring a timer, characterized by comprising the gateway according to any one of claims 11-17 and the mobility management network element according to any one of claims 18-20, said mobility The management network element sends a create session request message to the gateway, where the create session request message includes infrequent transfer characteristic information.