WO2017190350A1

WO2017190350A1 - Coverage level-based paging method, core network device and base station

Info

Publication number: WO2017190350A1
Application number: PCT/CN2016/081291
Authority: WO
Inventors: 刘清顺
Original assignee: 华为技术有限公司
Priority date: 2016-05-06
Filing date: 2016-05-06
Publication date: 2017-11-09

Abstract

The present application relates to a coverage level-based paging method, a core network device and a base station. The method comprises: receiving a current coverage level of a terminal and the maximum coverage level of the terminal from a first base station; sending a first paging message to the first base station so as to notify the first base station to page the terminal under the current coverage level of the terminal, wherein the first paging message comprises the current coverage level of the terminal; and if a paging response message of the first paging message is not received within a pre-set time, determining a first coverage level of the terminal according to the current coverage level of the terminal and the maximum coverage level of the terminal, and sending a second paging message to the first base station so as to notify the first base station to page the terminal under the first coverage level, wherein the second paging message comprises the first coverage level, and the first coverage level is greater than the current coverage level of the terminal and is less than or equal to the maximum coverage level of the terminal. The embodiments of the present application save paging channel resources.

Description

Coverage method based on coverage level, core network equipment and base station

Technical field

The present application relates to the field of communication technologies, and in particular, to coverage level paging.

Background technique

Internet of Things (IoT) is an important application in the future communication field, covering intelligent meter reading, medical inspection and monitoring, logistics detection, industrial inspection and monitoring, automotive networking, smart communities and wearable devices. . One type of important IoT communication system is a communication system based on the existing cellular network infrastructure. This type of communication system is called Cellular IoT (CIoT). The 3GPP (3rd generation partner ship project) standards organization has been paying attention to the development of CIoT and actively carrying out standardization of related technologies.

The CIoT system needs to support large/deep coverage. For terminals in different communication environments, the scheduling strategy of the base station will be completely different. In order to ensure the reliability of communication and save the transmission power of the terminal, it is necessary to distinguish terminals of different channel conditions to facilitate the base station to perform scheduling. For this reason, the concept of coverage level is introduced in the CIoT system. For terminals at the same coverage level, the channel transmission conditions are similar. The base station can use the same channel parameters for such terminals, for example, using the same number of subcarriers, modulation and coding scheme, and coding block. Size and so on.

1 is a schematic diagram of coverage levels in a prior art CIoT system. Fig. 1 only schematically describes three coverage levels, and in fact the number of coverage levels is not limited. In Figure 1, the CIoT system can be divided into three coverage levels. The coverage level of the terminal closer to the base station is the coverage level 1. The coverage level of the terminal farther from the base station is the coverage level 2, and the coverage of the terminal farther from the base station. The rating is coverage level 3. The terminal selects appropriate channel parameters according to the coverage level and performs data transmission. The CIoT system uses different coverage levels to make the wireless channel corresponding to each coverage level adopt the most suitable modulation and coding scheme and The repetitive scheme improves the system capacity under the premise of ensuring coverage, and saves the power consumption of the terminal battery and reduces the service delay because the channel rate is improved.

Currently, the paging is performed on the UE, and the maximum paging set by the core network device, such as the Mobility Management Entity (MME)/CIoT Serving Gateway Node (C-SGN). The number of times to page the UE. For example, the CIoT system is divided into three coverage levels, and the core network device, such as the MME/C-SGN, sets each coverage level for paging 4 times, and the maximum paging number is 12. Therefore, the prior art paging terminal has a simple manner, resulting in an excessive number of pagings, wasting unnecessary paging channel resources, and causing problems such as excessively long downlink packets to be buffered.

Summary of the invention

The coverage level-based paging method, the core network device, and the base station provided by the present application solve the problem that the paging channel resources are wasted in the prior art by paging the terminal according to the maximum number of paging times.

In a first aspect, the present application provides a paging method based on coverage level. The method receives a current coverage level of the terminal and a maximum coverage level of the terminal from the first base station. And transmitting, to the first base station, a first paging message, where the first paging message includes a current coverage level of the terminal, to notify the first base station to page the terminal at a current coverage level of the terminal. If the paging response message of the first paging message is not received within a preset time, determining a first coverage level of the terminal according to a current coverage level of the terminal and a maximum coverage level of the terminal, and to the first The base station sends a second paging message, where the second paging message includes the first coverage level to notify the first base station to page the terminal at the first coverage level. The first coverage level is greater than a current coverage level of the terminal and is less than or equal to a maximum coverage level of the terminal.

According to the current coverage level of the terminal from the base station and the maximum coverage level of the terminal, the paging terminal is reduced in comparison with the prior art paging terminal using a fixed number of paging times, thereby saving the number of paging terminals. Paging channel resources.

In a design of the present application, before sending the first paging message to the first base station, the method includes: Dividing the maximum coverage level of the terminal and the current coverage level difference of the terminal by the step size, then rounding up and adding 1, and multiplying by the paging number of each coverage level to obtain the maximum paging number of the terminal; The maximum number of pagings determines the buffering time of the downlink data.

Further, receiving a downlink data notification message from the serving gateway, and sending a response message to the serving gateway according to the downlink data notification message, where the response message carries the downlink data buffering time. The embodiment of the present application estimates that the downlink data buffering time is more accurate than the prior art, and reduces resources required for buffering downlink data packets.

In a design of the present application, a third paging request message is sent to the second base station, where the third paging request message includes a second coverage level to notify the second base station to page the terminal at the second coverage level. The second coverage level is less than or equal to the maximum coverage level supported by the second base station; wherein the second base station and the first base station belong to the same tracking area or the same tracking area list.

In a second aspect, the present application provides a paging method based on coverage level. First, the base station receives the current coverage level of the terminal, and determines the maximum coverage level of the terminal. The base station then transmits the current coverage level of the terminal and the maximum coverage level of the terminal to the core network device. The base station receives a first paging message from the core network device, the first paging message including a current coverage level of the terminal. The base station pages the terminal at the current coverage level of the terminal. The base station receives a second paging message from the core network device, where the second paging message includes a first coverage level of the terminal, where the first coverage level is greater than a current coverage level of the terminal and is less than or equal to a maximum coverage of the terminal. grade. The base station pages the terminal at the first coverage level.

In a third aspect, the present application provides a core network device. The core network device includes an interface and a processor. The interface is configured to receive a current coverage level of the terminal and a maximum coverage level of the terminal from the first base station, and send a first paging message to the first base station, where the first paging message includes a current coverage level of the terminal. In order to notify the first base station to page the terminal under the current coverage level of the terminal. The processor is configured to: if the paging response message of the first paging message is not received within a preset time, determine a first coverage level of the terminal according to a current coverage level of the terminal and a maximum coverage level of the terminal. The interface is further configured to send a second paging message to the first base station, where the second paging message includes The first coverage level is used to notify the first base station to page the terminal at the first coverage level; wherein the first coverage level is greater than a current coverage level of the terminal and less than or equal to a maximum coverage level of the terminal.

In a fourth aspect, an embodiment of the present application provides a base station. The base station includes a receiver, a processor, and a transmitter. The receiver is configured to receive the current coverage level of the terminal. The processor is used to determine the maximum coverage level of the terminal. The transmitter is configured to send the current coverage level of the terminal and the maximum coverage level of the terminal to the core network device. The receiver is further configured to receive a first paging message from the core network device, the first paging message including a current coverage level of the terminal. The processor is further configured to page the terminal at a current coverage level of the terminal. The receiver is further configured to receive a second paging message from the core network device, where the second paging message includes a first coverage level of the terminal, the first coverage level is greater than a current coverage level of the terminal, and is less than or equal to the The maximum coverage level of the terminal. The processor is further configured to page the terminal at the first coverage level.

In a fifth aspect, an embodiment of the present application provides a paging device based on a coverage level. The coverage level-based paging device includes an overlay level receiving module, a paging message sending module, and a coverage level determining module. The coverage level receiving module is configured to receive, from the first base station, a current coverage level of the terminal and a maximum coverage level of the terminal. The paging message sending module is configured to send a first paging message to the first base station, where the first paging message includes a current coverage level of the terminal, to notify the first base station to page at a current coverage level of the terminal. The terminal. The coverage level determining module is configured to: if the paging response message of the first paging message is not received within a preset time, determine the first coverage of the terminal according to the current coverage level of the terminal and the maximum coverage level of the terminal. grade. The paging message sending module is further configured to send a second paging message to the first base station, where the second paging message includes the first coverage level, to notify the first base station to page the first coverage level. terminal. The first coverage level is greater than a current coverage level of the terminal and is less than or equal to a maximum coverage level of the terminal.

In a sixth aspect, an embodiment of the present application provides another paging device based on coverage level. The coverage level-based paging device includes a current coverage level receiving module, a maximum coverage level determining module, an overlay level sending module, a paging message receiving module, and a paging terminal module. The current coverage level is connected The receiving module is used to receive the current coverage level of the terminal. The maximum coverage level determining module is configured to determine a maximum coverage level of the terminal. The coverage level sending module is configured to send, to the core network device, a current coverage level of the terminal and a maximum coverage level of the terminal. The paging message receiving module is configured to receive a first paging message from the core network device, where the first paging message includes a current coverage level of the terminal. The paging terminal module is configured to page the terminal at the current coverage level of the terminal. The paging message receiving module is further configured to receive, by the core network device, a second paging message, where the second paging message includes a first coverage level of the terminal, where the first coverage level is greater than a current coverage level of the terminal and is less than Or equal to the maximum coverage level of the terminal. The paging terminal module is further configured to page the terminal under the first coverage level.

Compared with the prior art, the embodiment of the present application reduces the number of paging retransmissions, saves the paging channel resources, and improves the paging success rate, and the embodiment of the present application estimates the downlink data buffering time more accurately than the prior art. , reducing the resources required to cache downstream packets.

DRAWINGS

1 is a schematic diagram of coverage levels in a CIoT system in the prior art;

2 is a schematic diagram of an EPS network system architecture;

Figure 3 is a structural diagram of a non-roaming CIoT system;

Figure 4 is a schematic diagram of a roaming CIoT system;

FIG. 5 is a schematic diagram of obtaining a current coverage level and a maximum coverage level of a terminal according to an embodiment of the present disclosure;

6 is a coverage level paging method when a coverage level of a terminal is deteriorated according to an embodiment of the present disclosure;

FIG. 7 is a method for paging a coverage level when a coverage level of a terminal is improved according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a core network device according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a base station according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a coverage level based paging apparatus according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a coverage level based paging apparatus according to another embodiment of the present application.

detailed description

Embodiments of the present application will be described below with reference to the accompanying drawings.

The coverage level is introduced by the CIoT system, but the coverage level is not limited to the application in the CIoT system. Therefore, the coverage level paging method provided by the embodiment of the present application is applicable to any existing coverage level paging. Wireless communication systems, such as the traditional Evolved Packet System (EPS) and CIoT systems.

2 is a schematic diagram of an EPS network system architecture. FIG. 2 only schematically illustrates an EPS system architecture. In fact, an EPS network architecture typically includes more or fewer components than illustrated.

In FIG. 2, an EUTRAN (Evolved Universal Terrestrial Radio Access Network) is a network composed of a plurality of eNBs (E-UTRAN NodeBs, E-UTRAN Node Bs, LTE base stations) for implementing Wireless physical layer, wireless data link layer, radio resource scheduling and management, wireless access control and mobility management functions. Each base station eNB in the EUTRAN is connected to an S-GW (Serving Gateway) through a user plane interface S1-U for transmitting user data. Each base station eNB in the EUTRAN is connected to the MME through the control plane interface S1-MME to implement functions such as radio access bearer control.

The mobility management entity MME is mainly responsible for all control plane functions of the session management, including NAS (Non-access stratum) signaling and security, tracking area management, and P-GW (Packet data network gateway). Gateway) and S-GW selection.

The S-GW is mainly responsible for data transmission, forwarding, and routing handover of the UE, and serves as a local mobility anchor point when the UE switches between the base station eNBs, that is, for each UE, only one S-GW is used at each moment. service.

P-GW as an anchor point for PDN (Packet Data Network) connection, negative The IP address allocation of the UE, the data packet filtering of the UE, the rate control, and the generation of charging information are performed.

It can be seen from FIG. 2 that in the EPS wireless network, the MME is separated from the S-GW and the P-GW, and respectively implements corresponding functions as different logical network elements in the EPS wireless network. In fact, in some wireless communication systems, the MME may synthesize one logical network element with one or both of the S-GW and the P-GW, and when the MME synthesizes a core network device with the S-GW and/or the P-GW. When it is called C-SGN, as shown in Figure 3 and Figure 4.

In the non-roaming CIoT system, as shown in FIG. 3, the C-SGN is a core network device synthesized by the MME, the S-GW, and the P-GW. In the roaming CIoT system, as shown in FIG. 4, the C-SGN is a core network device synthesized by the MME and the S-GW, and the C-SGN and the P-GW are deployed separately, and the C-SGN and the P-GW are deployed. Interconnected through the S8 interface.

The C-SGN in FIG. 3 has the same function as the MME, P-GW, and S-GW in FIG. 2, and the C-SGN in FIG. 4 has the same function as the MME and S-GW in FIG. 2. For example, C-SGN can be used to support mobility management processes, support efficient small data transmission processes, support the secure processes necessary for efficient transmission of small data, support short message transmission based on packet switched domain, and support coverage level paging.

In FIG. 3 and FIG. 4, the UE determines its own coverage level by means of downlink measurement. For example, the UE determines its coverage level according to the pilot channel quality of the cell, the synchronization channel quality, and the physical downlink control channel quality. When the UE is in the connected state, the coverage level of the UE is reported to the base station eNB/C-BS (CIoT Base Station), and the base station eNB/C-BS reports the coverage level of the UE to the core network device, such as the MME/ C-SGN, the MME/C-SGN holds the coverage level of the UE. However, in the idle state, since the base station eNB/C-BS has released the context about the UE, the base station eNB/C-BS does not have any information of the UE in the idle state, and the UE coverage level is provided by the MME/C-SGN.

Coverage level is also called coverage enhancement (CE). It is divided into static CE and dynamic CE. Static CE means that the UE cannot change the coverage level when the UE is idle. Dynamic CE means that the UE can change when it is idle. The level of coverage is not notified to the network devices without notifying the MME/C-SGN. That is, when the UE is released from the connected state to the idle state, the UE may change the coverage level for the dynamic CE, and if the UE changes the coverage level when the UE is in the idle state, the UE will not change. The changed coverage level, ie the current coverage level, is reported to the base station eNB/C-BS and MME/C-SGN.

The present application is implemented in the user equipment after the UE establishes a connection with the base station eNB/C-BS and the core network device MME/C-SGN, and when the base station eNB/C-BS and the core network device MME/C-SGN release the connection. The current coverage level of the UE and the maximum coverage level of the UE in the UE Context Release Complete message are saved to the MME/C-SGN. When paging the UE, the core network device MME/C-SGN sends a first paging message for paging the UE to the base station eNB/C-BS, and the first paging message includes the current coverage level of the UE. The base station eNB/C-BS pages the UE at the current coverage level of the UE. If the core network device MME/C-SGN does not receive the paging response message of the first paging message within a preset time, determining the first of the UE according to the current coverage level of the UE and the maximum coverage level of the UE. Covering the level, and sending a second paging message to the base station eNB/C-BS, the second paging message includes the first coverage level, and the first coverage level is greater than a current coverage level of the UE and less than or equal to the UE The maximum coverage level. The base station eNB/C-BS pages the UE according to the first coverage level.

The following describes how the MME/C-SGN obtains the current coverage level and the maximum coverage level of the UE in conjunction with FIG. 5.

Step 501: The base station eNB/C-BS sets the maximum coverage level of the terminal for the terminal. Specifically, the base station sets the maximum coverage level of each terminal for the terminal in the coverage area of the base station.

In one example, for a terminal under dynamic CE (coverage level), the base station eNB/C-BS sets the maximum coverage level of the terminal to the coverage level maximum supported by the base station eNB/C-BS. In addition, for a terminal that is in a static CE (coverage level), the base station eNB/C-BS sets the maximum coverage level of the terminal to the current coverage level of the terminal, that is, for the terminal under the static CE, the current coverage level is equal to Maximum coverage level.

Step 502: The base station eNB/C-BS broadcasts the coverage level supported by the system, and the physical downlink control channel PDCCH resource and the random access channel RACH resource corresponding to each coverage level. The random access channel RACH is the uplink transmission. channel.

Step 503: The UE tests the downlink channel quality, and receives the system cancellation of the base station eNB/C-BS broadcast. The PDCCH resource and the RACH resource corresponding to the coverage level and the PDCCH resource and the RACH resource corresponding to each coverage level are read by the UE according to the coverage level supported by the base station eNB/C-BS and the RACH resource. The current coverage level of the UE is determined, and the current coverage level of the UE is the initial coverage level of the UE.

Step 504: The UE initiates a random access request to the base station eNB/C-BS, and carries the initial coverage level of the UE in the random access request message.

In an example, when the UE needs to initiate an MO (Mobile originated) service or an Attach/TAU procedure, the UE initiates a random connection on the RACH resource corresponding to its current coverage level (ie, the initial coverage level of the UE). The request is received, and the random access request message includes the current coverage level of the UE, that is, the initial coverage level of the UE. Therefore, the UE may carry the initial coverage level of the UE when performing the MO service or the Attach/TAU procedure. The MO service is an uplink data service; the Attach process is used to complete the registration of the UE on the network and is used to complete the establishment of the default bearer of the UE by the core network; the TAU process refers to the UE moving from one tracking area TA to another tracking area TA. At the time, the process of re-registering the location on the new TA.

Step 505: The base station eNB/C-BS receives a random access request message from the UE, obtains an initial coverage level of the UE from the random access request message, and saves an initial coverage level of the UE.

It should be noted that the foregoing steps 501 to 504 are an implementation manner of the base station eNB/C-BS acquiring the initial coverage level of the UE, which is an optional step. The method for obtaining the initial coverage level of the UE is not limited in this embodiment of the present application. The initial coverage level of the UE may be obtained in any manner.

In step 506, an RRC connection is established between the UE and the base station eNB/C-BS.

In an example, the UE establishes a connection with the base station eNB/C-BS by initiating RRC (Radio Resource Control) signaling to the base station eNB/C-BS.

Step 507, after the UE establishes a connection with the base station eNB/C-BS, the base station eNB/C-BS establishes an S1 connection with the core network device, such as the MME/C-SGN, that is, the base station eNB/C-BS and the core network device MME/C - SGN establishes a connection through interface S1.

For example, when the UE needs to initiate an Attach/TAU procedure, the UE first sends an RRC signaling party. The connection is established with the base station eNB/C-BS, and then the base station eNB/C-BS establishes a connection with the core network device MME/C-SGN through the interface S1.

Step 508: After the UE enters the connected state, it detects whether the coverage level changes.

In an example, the UE obtains its current coverage level. For example, the UE determines the current coverage of the UE by testing the downlink channel quality, and receiving the coverage level of the base station eNB/C-BS broadcast and the PDCCH resources and RACH resources corresponding to the coverage levels. Level: The UE then compares the current coverage level of the UE with the initial coverage level of the UE obtained in step 503. If they are consistent, the coverage level of the UE does not change. If not, the coverage level of the UE is indicated. A change has taken place.

Step 509: If the UE detects that its coverage level changes, the new coverage level is reported to the base station eNB/C-BS.

In step 510, the base station eNB/C-BS receives a new coverage level from the UE and saves the new coverage level of the UE.

In step 511, the base station eNB/C-BS initiates RRC signaling, and releases the RRC connection between the base station eNB/C-BS and the UE.

For example, after the data transmission between the UE and the base station eNB/C-BS is completed, the base station eNB/C-BS releases the connection with the UE by initiating RRC signaling.

Step 512: After the base station eNB/C-BS releases the connection with the UE, the base station eNB/C-BS sends a Context Release Complete message to the core network device MME/C-SGN, and carries the message in the message. The current coverage level of the UE and the maximum coverage level of the UE. At this time, the current coverage level of the UE is the new coverage level of the UE.

It should be noted that the current coverage level of the UE is the current coverage level of the UE reported by the base station eNB/C-BS to the core network device MME/C-SGN when the UE is in the connected state. The terminal may change its coverage level in the idle state. In the idle state, the terminal cannot report its coverage level to the core network device MME/C-SGN; therefore, the current UE is saved by the MME/C-SGN. The coverage level may not be the actual current coverage level of the UE, but the coverage level reported by the UE to the MME/C-SGN and saved by the MME/C-SGN when the UE is in the connected state.

It can be seen from step 501 that for a terminal under a dynamic CE (coverage level), the maximum coverage level of the terminal is the maximum coverage level supported by the base station eNB/C-BS. For a terminal in a static CE (coverage level), the maximum coverage level of the terminal is the current coverage level of the terminal.

Since the dynamic CE (coverage level) or the static CE (coverage level), as long as the current coverage level is the same as the maximum coverage level, there is no need to adjust the coverage level to page the UE, but only need to increase the paging range to the UE. Paging. The base station eNB/C-BS does not need to carry the dynamic CE and static CE flags in the user equipment context release complete message sent to the core network device MME/C-SGN. That is to say, the current coverage level of the UE and the maximum coverage level of the UE may be carried in the user equipment context release completion message, and the dynamic CE and the static CE flag are no longer required to be carried.

Step 513: The core network device MME/C-SGN receives the user equipment context release complete message from the base station eNB/C-BS, and obtains the current coverage level of the UE and the maximum coverage level of the UE from the message, and then saves The current coverage level of the UE and the maximum coverage level of the UE.

In summary, the foregoing steps 501 to 513 are an implementation manner in which the core network device receives the current coverage level of the terminal and the maximum coverage level of the terminal from the base station.

After the core network device receives the current coverage level of the terminal from the resident base station of the terminal and the maximum coverage level of the terminal, the core network device sends a paging message to the base station, where the paging message includes the current coverage of the terminal. grade. The base station then pages the terminal at the current coverage level of the terminal. If the core network device does not receive the paging response message of the paging message within a preset time, determining a first coverage level of the terminal according to the current coverage of the terminal and a maximum coverage level of the terminal, and to the base station Sending a second paging message, the second paging message including the first coverage level. The first coverage level is greater than a current coverage level of the terminal and is less than or equal to a maximum coverage level of the terminal. Finally, the base station pages the terminal at the first coverage level.

Further, the core network device sends a paging message to the second base station, where the paging message includes a second coverage level to notify the second base station to page the terminal at the second coverage level. And the second coverage level is less than or equal to a maximum coverage level supported by the second base station. Wherein the second base station and the end The base stations that reside at the end belong to the same tracking area or the same tracking area list.

The following is an example of how the coverage level of the UE is degraded and the coverage level of the UE becomes better. The embodiment of the present application is based on the current coverage level of the terminal and the maximum coverage level of the terminal (through the foregoing step 501 to Step 513 results in a paging terminal.

The coverage level-based paging method when the coverage level of the UE provided by the embodiment of the present application is deteriorated is described below with reference to FIG. 2-4 and FIG.

6 is a coverage area of the UE in the base station eNB1/C-BS1, and the coverage level of the UE is changed from CE2 (coverage level 2) to CE3 (cover level 3), and the maximum coverage level supported by the base station eNB1/C-BS1 is As an example, CE3 describes a coverage level-based paging method when the coverage level of the UE is deteriorated.

In step 601, the core network device MME/C-SGN stores the current coverage level CE2 of the UE and the maximum coverage level CE3 of the UE. The current coverage level of the UE is the UE and the base station eNB1/C-BS1 and the core network device MME/ When the C-SGN is in the connected state, the UE transmits to the base station, and the base station reports to the core network device, and the coverage level of the UE stored by the core network device. The maximum coverage level of the UE is reported by the base station eNB1/C-BS1 and reported to the core network device MME/C-SGN. Therefore, the current coverage level of the UE saved by the core network device is not necessarily the same as the actual current coverage level of the UE. When the UE is in the idle state, the coverage level changes and the base station eNB1/C-BS1 and the core network device MME/C-SGN cannot be reported.

For how the specific core network device MME/C-SGN obtains the current coverage level of the UE and the maximum coverage level of the UE, refer to FIG. 5 and the corresponding content description.

In step 602, the UE detects that its coverage level changes from CE2 to CE3, and the UE coverage level deteriorates.

Step 603: When there is downlink data to be transmitted to the UE, the core network device MME receives the downlink data notification message DDN from the serving gateway S-GW; or the core network device C-SGN receives the data from the PDN gateway P-GW or from the server. package.

Specifically, for the EPS system in FIG. 2, the server sends a data packet to the S-GW through the P-GW, and the S-GW receives the data packet and sends a downlink data notification message DDN to the MME, and the MME receives the downlink data notification message.

For the non-roaming CIoT system in Figure 3, the server sends a data packet to the C-SGN, which receives the data packet.

For the roaming CIoT system in FIG. 4, the server sends a data packet to the C-SGN through the P-GW, and the C-SGN receives the data packet.

Step 604: The core network device MME/C-SGN obtains the maximum paging number of the UE according to the current coverage level of the UE and the maximum coverage level of the UE (obtained by FIG. 5 and its corresponding steps), according to the maximum The number of pagings determines the maximum downlink data buffering time, referred to as the DL Buffering Duration. The maximum number of pagings refers to the number of times the UE is paged in the worst case.

In an example, the maximum coverage level of the UE is divided by the current coverage level difference of the UE by the step size, and then rounded up by 1 and multiplied by the paging number of each coverage level to obtain the maximum of the UE. Number of pagings.

For example, the CIoT system has five coverage levels, namely coverage level 1, coverage level 2, coverage level 3, coverage level 4, coverage level 5, the current coverage level of the UE is coverage level 2, and the maximum coverage level of the UE is coverage level. 5, the step size is 2, and the paging number of each coverage level is 2; then the maximum paging number calculation method of the UE is: (5-2)/2 is rounded up to get 2, then 2 plus 1 gets 3, 3 The number of paging times multiplied by each coverage level is 6, so the maximum paging number of the UE is 6. A method for paging a UE is to first page 2 times at the current coverage level 2, and if the paging is not available, then page 2 times at the coverage level 4, and if the paging is still not available, the paging at the coverage level 5 2 times, a total of 6 pages, which is the maximum number of pages.

Step 605: For the EPS system, the core network device MME returns a DDN response message to the S-GW to notify the S-GW of the time for buffering the downlink data according to the obtained downlink data buffer time. For the CIoT system, the core network device C-SGN is based on The downlink data buffer time buffers the downlink data.

Specifically, if the UE, the base station, and the core network device are in the EPS system, the core network device MME returns a response message DDN Ack of the downlink data notification to the serving gateway S-GW after obtaining the downlink data buffering time, and in the message. Carry the DL Buffering Duration, To inform the S-GW of the time required to buffer the downlink data. If the UE, the base station, and the core network device are in the CIoT system, the core network device C-SGN caches the downlink data according to the cache time after obtaining the downlink data buffering time.

How to obtain the downlink data buffering time and how to buffer the downlink data based on the buffering time for the core network device MME/C-SGN in the EPS system, the non-roaming CIoT system, and the roaming CIoT system, with reference to FIGS. 2, 3, and 4; Detailed.

In the EPS system, the core network devices MME, S-GW, and P-GW are deployed separately. As shown in FIG. 2, when downlink data from the server reaches the S-GW through the P-GW, the S-GW sends downlink data to the MME. The notification message DDN, after the MME receives the DDN of the message, the MME according to the downlink data to reach the current coverage level of the terminal and the maximum coverage level of the terminal (the current coverage level is a value stored in the MME, not necessarily the actual UE) Current coverage level), and determining the maximum number of paging times for paging the UE in the paging mode according to the manner in which the MME sets the paging UE. The MME then obtains the maximum buffer time of the downlink data required by the terminal in the S-GW according to the maximum number of paging times, that is, the DL Buffering Duration is obtained; wherein the manner of paging the UE can be set by the user. Or the MME selects a paging mode according to statistics on the paging success rate in various paging modes. For example, one paging mode is to page the UE under the current coverage level of the UE, and if the paging is not available, increase the coverage level paging UE. After the MME obtains the buffering time of the downlink data, the MME returns a DDN Ack (DDN Ack) message to the S-GW, and carries the downlink data buffering time in the DDN acknowledgment message to notify the S-GW of the buffering time of the downlink data. If the UE is not paged within the downlink data buffering time, the S-GW discards the downlink data packet it receives after the buffering time of the downlink data is reached.

The current coverage level of the UE stored in the MME is CE2. In fact, the current coverage level of the UE has changed to CE3, and the maximum coverage level of the UE is CE3.

(1) The MME sets the mode of paging the UE. For example, the manner of paging the UE is: first paging the UE under the current coverage level CE2 of the UE of the current base station eNB1; if the paging is not available, increasing the search For the call range, the base station eNB1 and its neighboring base station eNB2 simultaneously initiate paging; if the paging is not available, the coverage level of the UE of the base station eNB1 is adjusted first, that is, the UE is paged under the coverage level CE3 of the base station eNB1, and is at the base station. The UE is advertised under the coverage level CE2 of eNB2; if the paging is not available, the UE is paged at the coverage level CE3 of the base station eNB2.

(2) The MME counts the maximum number of pagings according to the manner of paging the UE. Since each paging time is a fixed value, the MME can obtain the time for the S-GW to buffer the downlink data according to the maximum paging number. It should be noted that the maximum number of paging times calculated by the MME is a result obtained according to the worst case. In some cases, the UE is paged without paging. For example, the UE is paged under the coverage level CE3 of the base station eNB1, and if the paging is successful, the UE is not paged under the coverage level CE3 of the base station eNB2. Although the number of pagings required for the MME to page different UEs according to the same paging mode may be different, the MME calculates the maximum number of pagings in the paging mode, and the buffering time of the downlink data is obtained by the maximum paging number. .

In the non-roaming CIoT system, as shown in FIG. 3, the C-SGN receives the downlink data packet from the server, and the C-SGN is based on the maximum coverage level of the terminal and the current coverage level of the terminal (the current coverage level is stored in The value in the C-SGN, but most likely not the actual current coverage level of the UE), and the method of paging the UE according to the C-SGN setting, determining the maximum number of paging times for paging the UE in the mode, and according to the The maximum number of paging times is the downlink data buffering time of the paging UE. The C-SGN buffers the downlink data from the server according to the obtained downlink data buffering time. If the UE does not successfully page to the UE after the buffering time is reached, the downlink data packet is discarded.

In the roaming CIoT system, the core network device C-SGN is deployed separately from the P-GW. As shown in FIG. 4, the C-SGN receives the downlink data packet from the P-GW, and the C-SGN is based on the maximum coverage level of the terminal. The current coverage level of the terminal, and the manner of paging the UE according to the C-SGN setting, determines the maximum paging number of the paging UE, and obtains the downlink data buffering time of the paging according to the maximum paging number. The C-SGN buffers the downlink data from the server according to the downlink data buffering time, and discards the downlink data packet if the UE is not successfully paged after the buffering time of the downlink data is reached.

Step 606: The core network device MME/C-SGN first sends a paging cancellation to the current base station eNB1/C-BS1. The paging message includes the current coverage level CE2 of the terminal to notify the base station eNB1/C-BS1 to page the terminal under the current coverage level CE2 of the terminal. Step 607: The base station eNB1/C-BS1 sends a paging message on the PDCCH corresponding to the coverage level CE2 to page the UE.

Step 608, since the coverage level of the UE has changed from CE2 to CE3, the UE fails to decode the PDCCH message according to its current coverage level CE3, and the paging message reception fails, so the paging UE fails.

Step 609, because the paging fails, the paging timer of the core network device MME/C-SGN expires (the specific paging timing can be set, for example, the time for successfully paging the UE), that is, preset. The core network device MME/C-SGN does not receive the paging response message, the core network device MME/C-SGN increases the paging range, and the base station eNB1/C-BS1 and the base station eNB2/C-BS2 simultaneously initiate paging. And the paging coverage level is not adjusted first, and paging is still performed according to CE2. That is, the core network device MME/C-SGN simultaneously notifies the base station eNB1/C-BS1 and the base station eNB2/C-BS2 to page the UE, and informs the base station eNB1/C-BS1 and the base station eNB2/C-BS2 to page the respectively. The coverage level of the UE is the coverage level CE2.

Step 610: The base station eNB1/C-BS1 sends a paging message on the PDCCH corresponding to the coverage level CE2 to page the UE, and the base station eNB2/C-BS2 sends a paging message on the PDCCH corresponding to the coverage level CE2 to page the UE.

Step 611: The UE fails to decode the PDCCH message on the coverage level CE3 according to the base station eNB1/C-BS1, and the paging message fails to be received, so the paging UE fails.

Step 612, the paging timer of the core network device MME/C-SGN expires due to the paging failure, that is, the paging response message is not received within the preset time, and the core network device MME/C-SGN adjusts the base station eNB1/ The coverage level of the C-BS1 paging the UE is the coverage level CE3, and the eNB2/C-BS2 still pages the UE by the coverage level CE2.

Step 613: The base station eNB1/C-BS1 sends a paging message on the PDCCH corresponding to the coverage level CE3, and the base station eNB2/C-BS2 sends a paging message on the PDCCH corresponding to the coverage level CE2 to page the UE.

Step 614: The UE successfully decodes the PDCCH message according to the base station eNB1/C-BS1 at the coverage level CE3, and the paging message is successfully received, so the paging UE succeeds.

It should be noted that the above steps 605 to 610 are an example of the paging mode, specifically The paging method can be set. For example, the core network device MME/C-SGN selects a paging mode according to the paging success rate of various paging modes.

Step 615: The UE sends a Service Request message to the core network device MME/C-SGN as a paging response message, and notifies the MME/C-SGN to page the UE successfully.

It should be noted that FIG. 6 and steps 601 to 614 are examples of successfully paging to the UE. In fact, in some cases, if the paging is not available to the UE, the UE is not continuously paged. The core network device MME/C-SGN, in the downlink data buffering time (obtained by step 604), does not receive the paging success message, then the core network device MME/C-SGN will discard the downlink data packet.

The coverage level-based paging method when the coverage level of the UE is improved according to the embodiment of the present application is described below with reference to FIGS. 2-4 and FIG.

7 is a coverage area of the UE in the base station eNB1/C-BS1, and the coverage level of the UE is changed from CE2 (coverage level 2) to CE1 (coverage level 1), and the maximum coverage level supported by the base station eNB1/C-BS1 is As an example, CE3 describes a coverage level-based paging method when the coverage level of the UE becomes better.

In step 701, the core network device MME/C-SGN stores the current coverage level CE2 of the UE and the maximum coverage level CE3 of the UE. The current coverage level of the UE is the UE and the base station eNB1/C-BS1 and the core network device. When the MME/C-SGN is in the connected state, the UE transmits to the base station, and the base station reports to the core network device, and the coverage level of the UE stored by the core network device. The maximum coverage level of the UE is reported by the base station eNB1/C-BS1 and reported to the core network device MME/C-SGN. Therefore, the current coverage level of the UE saved by the core network device is not necessarily the same as the actual current coverage level of the UE. There is a case where the coverage level changes when the UE is in the idle state and cannot be reported to the base station eNB1/C-BS1 and the core network device MME/C-SGN.

For how the specific core network device MME/C-SGN obtains the current coverage level of the UE and the maximum coverage level of the UE, refer to FIG. 5 and the corresponding content description. .

In step 702, the UE detects that its coverage level changes from CE2 to CE1, and the coverage level of the UE becomes better.

Step 703: When there is downlink data to be transmitted to the UE, the core network device MME receives the service from the service. The downlink data notification message DDN of the gateway S-GW; or the core network device C-SGN receives the data packet from the PDN gateway P-GW or receives from the server.

Step 704: The core network device MME/C-SGN obtains the maximum paging number of the UE according to the current coverage level of the UE and the maximum coverage level of the UE (obtained by FIG. 5 and its corresponding steps), according to the maximum homing The number of calls determines the DL Buffering Duration. The maximum number of pagings of the paging UE refers to the number of times the UE is paged in the worst case.

In an example, the maximum coverage level of the UE is divided by the current coverage level difference of the UE by the step size, and then rounded up by 1 and multiplied by the paging number of each coverage level to obtain the maximum of the UE. Number of pagings. Step 705: For the EPS system, the core network device MME returns a DDN response message to the S-GW to notify the S-GW of the time for buffering the downlink data according to the obtained downlink data buffering time. For the CIoT system, the core network device C-SGN is based on The downlink data buffer time buffers the downlink data.

Specifically, if the UE, the base station, and the core network device are in the EPS system, the core network device MME returns a response message DDN Ack of the downlink data notification to the serving gateway S-GW after obtaining the downlink data buffering time, and in the message. The DL Buffering Duration is carried to notify the S-GW of the time required to buffer the downlink data. If the UE, the base station, and the core network device are in the CIoT system, the core network device C-SGN caches the downlink data according to the cache time after obtaining the downlink data buffering time.

How to obtain the downlink data buffer time and how to obtain the downlink data cache time for the EPS system, the non-roaming CIoT system, and the core network device MME/C-SGN in the roaming CIoT system, with reference to FIGS. 2, 3, and 4; The time buffered downlink data is described in detail.

In the EPS system, the core network devices MME, S-GW, and P-GW are deployed separately. As shown in FIG. 2, when downlink data from the server reaches the S-GW through the P-GW, the S-GW sends downlink data to the MME. The notification message DDN, after the MME receives the DDN of the message, the MME according to the downlink data to reach the maximum coverage level of the terminal and the current coverage level of the terminal (the current coverage level is a value stored in the MME, not necessarily the actual UE Current coverage level), and determining the maximum number of paging times for paging the UE in the paging mode according to the manner in which the MME sets the paging UE. The MME then obtains a DL Buffering Duration of the downlink data according to the maximum number of paging times. The manner in which the UE is paged can be set by the user, or the MME selects a type of homing according to the paging success rate in various modes. Call mode. After the MME obtains the buffering time of the downlink data, the MME returns a DDN Ack (DDN Ack) message to the S-GW, and carries the downlink data buffering time in the DDN acknowledgment message to notify the S-GW of the buffering time of the downlink data. If the UE is not paged within the downlink data buffering time, the S-GW discards the downlink data packet it receives after the buffering time of the downlink data is reached.

Specifically, in the CIoT system, including the roaming CIoT system and the non-roaming CIoT system, how to determine the buffering time of the downlink data, and how to buffer the downlink data packet according to the buffering time of the downlink data, refer to step 604 and step 605 above. This will not be repeated here. Step 706: The core network device MME/C-SGN sends a paging message to the current base station eNB1/C-BS1, where the paging message includes the current coverage level of the terminal is CE2. That is, the MME notifies the base station eNB1/C-BS1 to page the UE, and informs the base station eNB1/C-BS1 to page the coverage level of the terminal to CE2.

Step 707: The base station eNB1/C-BS1 sends a paging message on the PDCCH corresponding to the coverage level CE2 to page the UE.

Step 708, although the UE coverage level has changed from CE2 to CE1, since the UE coverage level becomes better, the base station eNB1/C-BS1 can still page the UE successfully on the coverage level CE2.

Step 709: After the base station eNB1/C-BS1 pages the UE successfully, the UE initiates a random access request. And carrying the current coverage level CE1 in the random access request message. In one example, the UE initiates a random access request on a random access channel corresponding to its current coverage level CE1.

Step 710: After receiving the random access request message including the current coverage level CE1 of the UE, the base station eNB1/C-BS1 saves the current coverage level CE1 of the UE.

Step 711: The UE sends a Service Request message to the core network device MME/C-SGN as a paging response message, and notifies the MME/C-SGN to page the UE successfully.

It should be noted that if the core network device MME/C-SGN does not receive the paging response message during the buffering time of the downlink data, the core network device MME/C-SGN will discard the downlink data packet.

Step 712: After receiving the paging response message, the core network device MME/C-SGN controls the paging timer to stop working, and the UE enters the connected state.

Step 713: After the UE completes the service (such as data transmission), the UE needs to release from the connected state to the idle state, and the base station eNB1/C-BS1 releases the connection between the UE and the base station.

In step 714, the base station eNB1/C-BS1 carries the current coverage level CE1 of the UE and the maximum coverage level CE3 of the UE in the UE Context Release Complete message.

Step 715: The core network device MME/C-SGN receives the user equipment context release complete message, and obtains the current coverage level of the UE and the maximum coverage level of the UE from the message, and saves the current coverage level CE1 of the UE. The maximum coverage level of the UE is CE3.

FIG. 8 is a schematic diagram of a core network device according to an embodiment of the present application.

The core network device can be in any of the existing wireless communication systems for coverage level paging. For example, the core network device MME in the Evolved Packet System EPS, for example, the core network device C-SGN in the CIoT system (including the roaming CIoT system and the non-roaming CIoT system).

In FIG. 8, the core network device 800 includes an interface 810 and a processor 820. Further, the core network device 800 also includes a memory 830. It should be noted that those skilled in the art can understand that the core network device 800 structure shown in FIG. 8 does not constitute a limitation on the core network device, and may include more or less components than those illustrated, or may combine certain components. Parts, or different parts.

The interface 810 is a communication interface. For example, when the core network device is the MME, the interface 810 can be the control plane interface S1-MME. When the core network device is the C-SGN, the interface 810 can be the S1-lite interface. Since the core network device and the base station are connected by wire, the information transmission between the core network device and the base station is completed through the interface 810.

The interface 810 is configured to receive, by the first base station, a current coverage level of the terminal and a maximum coverage level of the terminal, and send the first paging message to the first base station, where the first paging message includes a current coverage level of the terminal, Notifying the first base station to page the terminal at the current coverage level of the terminal.

In one example, interface 810 receives a message from the first base station that includes the current coverage level of the terminal and the maximum coverage level of the terminal. Further, when releasing the connection with the terminal, the interface 810 receives a Context Release Complete message of the user equipment, and the current coverage level of the terminal and the maximum coverage level of the terminal are carried in the user equipment context content release. Completed in the (Context Release Complete) message. For details, refer to step 506 to step 513 in FIG.

In one example, the maximum coverage level of the terminal is set by the first base station. Further, under the static coverage level, the maximum coverage level of the terminal is equal to the current coverage level of the terminal; in the dynamic coverage level, the maximum coverage level of the terminal is equal to the maximum coverage level supported by the first base station.

In an example, the current coverage level of the terminal is obtained by the terminal by testing the downlink channel quality, and by receiving the PDCCH resource and the RACH resource corresponding to the coverage levels broadcast by the first base station. For details, refer to step 501 to step 504 in FIG. 5 above.

The processor 820 is configured to: if the paging response message of the first paging message is not received within a preset time, determine the first coverage level of the terminal according to the current coverage of the terminal and the maximum coverage level of the terminal.

The interface 810 is further configured to send, to the first base station, a second paging message, where the second paging message includes the first coverage level, to notify the first base station to page the terminal at the first coverage level; The first coverage level is greater than a current coverage level of the terminal and less than or equal to a maximum coverage level of the terminal.

In an example, the interface 810 is further configured to send a third paging message to the second base station, where the third homing The call message includes a second coverage level to notify the second base station to page the terminal at the second coverage level; the second coverage level is less than or equal to a maximum coverage level supported by the second base station; wherein the second base station It belongs to the same tracking area or the same tracking area list as the first base station.

In an example, the processor 820 is further configured to divide the maximum coverage level of the terminal and the current coverage level difference of the terminal by the step size, and then round up and add 1 to multiply the number of paging times of each coverage level. Obtaining a maximum number of paging times of the terminal; determining a buffering time of the downlink data according to the maximum number of pagings.

In one example, the core network device also includes a memory 830 for storing downstream data from the server.

In one example, the interface 810 is configured to send the downlink data to the terminal after paging the terminal successfully.

In an example, the interface 810 is further configured to receive a downlink data notification message from the serving gateway, and configured to send, according to the downlink data notification message, a response message to the serving gateway, where the response message carries the downlink data cache time.

In another example, the interface 810 is further configured to receive a paging response message of the second paging message, and configured to send downlink data to the terminal according to the paging response message; or, the interface 810 is further configured to use the The response message is sent to the service gateway to notify the service gateway to send downlink data to the terminal.

The processor 820 is further configured to discard the downlink data when the time for paging the terminal exceeds the buffering time of the downlink data.

FIG. 9 is a schematic structural diagram of a base station according to an embodiment of the present application.

The base station can be in any of the existing wireless communication systems for coverage level paging. For example, a base station eNB in an evolved packet system EPS, for example, a base station C-BS in a CIoT system (including a roaming CIoT system and a non-roaming CIoT system).

In FIG. 9, the base station 900 includes a receiver 910, a processor 920, and a transmitter 930.

It should be noted that those skilled in the art can understand that the base station 900 shown in FIG. 9 has a structure and It does not constitute a limitation to a base station, and may include more or less components than those illustrated, or some components may be combined, or different component arrangements.

In Figure 9, the receiver 910 is configured to receive the current coverage level of the terminal. Specifically, the current coverage level of the terminal is obtained by the terminal by measuring the downlink channel quality, and by receiving the coverage level of the base station 900 corresponding to the PDCCH and the RACH.

In one example, the receiver 910 is configured to receive a message containing the current coverage level of the terminal, such as a random access request message.

The processor 920 is configured to determine a maximum coverage level of the terminal.

In one example, for a static coverage level terminal, the processor 920 sets the maximum coverage level of the terminal to be equal to the current coverage level of the terminal; for the dynamic coverage level terminal, the processor 920 sets the maximum coverage level of the terminal to the base station. The maximum coverage level supported by the 900.

The transmitter 930 is configured to send the current coverage level of the terminal and the maximum coverage level of the terminal to the core network device.

In one example, the sender 930 is configured to send a message including the current coverage level of the terminal and the maximum coverage level of the terminal to the core network element, and the message is a user equipment context content release complete message.

The receiver 910 is further configured to receive a first paging message from the core network device, where the first paging message includes a current coverage level of the terminal.

The processor 920 is further configured to page the terminal at a current coverage level of the terminal.

The receiver 910 is further configured to receive, by the core network device, a second paging message, where the second paging message includes a first coverage level of the terminal, where the first coverage level is greater than a current coverage level of the terminal and is less than or equal to the The maximum coverage level of the terminal.

The processor 920 is further configured to page the terminal at the first coverage level.

FIG. 10 is a schematic diagram of a coverage level based paging apparatus according to an embodiment of the present application.

The coverage level-based paging apparatus 100 includes an overlay level receiving module 101, a paging message transmitting module 102, and an overlay level determining module 103.

The coverage level receiving module 101 is configured to receive, from the first base station, a current coverage level of the terminal and a maximum coverage level of the terminal.

The paging message sending module 102 is configured to send a first paging message to the first base station, where the first paging message includes a current coverage level of the terminal, to notify the first base station to search for the current coverage level of the terminal. Call the terminal.

The coverage level determining module 103 is configured to: if the paging response message of the first paging message is not received within a preset time, determine the first of the terminal according to the current coverage level of the terminal and the maximum coverage level of the terminal Coverage level.

The paging message sending module 102 is further configured to send a second paging message to the first base station, where the second paging message includes the first coverage level, to notify the first base station to page at the first coverage level. The terminal.

The first coverage level is greater than a current coverage level of the terminal and is less than or equal to a maximum coverage level of the terminal.

In one example, the maximum coverage level of the terminal is the maximum coverage level supported by the first base station.

In one example, the current coverage level of the terminal and the maximum coverage level of the terminal are carried in a context content release complete message of the user equipment.

In one example, the coverage level based paging device further includes a paging number determination module 104 and a cache time determination module 105.

The paging number determining module 104 is configured to divide the maximum coverage level of the terminal and the current coverage level difference of the terminal by the step size, then round up and add 1, and then multiply the paging number of each coverage level to obtain The maximum number of pagings for this terminal.

The buffer time determining module 105 is configured to determine the maximum number of paging times determined by the module 104 according to the maximum number of paging times, to obtain a downlink data buffering time.

In an example, the paging message sending module 102 is further configured to send a third paging message to the second base station, where the third paging message includes a second coverage level to notify the second base station to be in the second coverage level. Paging the terminal; the second coverage level is less than or equal to the maximum coverage supported by the second base station, etc. level.

The second base station and the first base station belong to the same tracking area or the same tracking area list.

The coverage level-based paging device 110 includes a current coverage level receiving module 111, a maximum coverage level determining module 112, an overlay level transmitting module 113, a paging message receiving module 114, and a paging terminal module 115.

The current coverage level receiving module 111 is configured to receive a current coverage level of the terminal.

The maximum coverage level determining module 112 is configured to determine a maximum coverage level of the terminal.

The coverage level sending module 113 is configured to send the current coverage level of the terminal and the maximum coverage level of the terminal to the core network device.

The paging message receiving module 114 is configured to receive a first paging message from the core network device, where the first paging message includes a current coverage level of the terminal.

The paging terminal module 115 is configured to page the terminal at the current coverage level of the terminal.

The paging message receiving module 115 is further configured to receive, by the core network device, a second paging message, where the second paging message includes a first coverage level of the terminal, where the first coverage level is greater than a current coverage level of the terminal and Less than or equal to the maximum coverage level of the terminal.

The paging terminal module 115 is further configured to page the terminal under the first coverage level.

In one example, the maximum coverage level of the terminal is the maximum coverage level supported by the coverage level based paging device 110.

The specific embodiments of the present invention have been described in detail with reference to the specific embodiments of the present application. It is to be understood that the foregoing description is only The scope of protection, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application are intended to be included within the scope of the present application.

Claims

A coverage level based paging method, comprising:

Receiving, from the first base station, a current coverage level of the terminal and a maximum coverage level of the terminal;

Sending a first paging message to the first base station, where the first paging message includes a current coverage level of the terminal, to notify the first base station to page the terminal at a current coverage level of the terminal ;

If the paging response message of the first paging message is not received within a preset time, determining a first coverage level of the terminal according to a current coverage level of the terminal and a maximum coverage level of the terminal, and Sending, to the first base station, a second paging message, where the second paging message includes the first coverage level, to notify the first base station to page the terminal under the first coverage level;

The first coverage level is greater than a current coverage level of the terminal and is less than or equal to a maximum coverage level of the terminal.
The method according to claim 1, wherein the maximum coverage level of the terminal is a maximum coverage level supported by the first base station.
The method according to claim 1 or 2, wherein the current coverage level of the terminal and the maximum coverage level of the terminal are carried in a context content release completion message of the user equipment.
The method according to any one of claims 1 to 3, wherein before the sending the first paging message to the first base station, the method includes:

Dividing the maximum coverage level of the terminal and the current coverage level difference of the terminal by the step size, then rounding up and adding 1, and multiplying by the paging number of each coverage level to obtain the maximum paging of the terminal. frequency;

Determining a cache time of the downlink data according to the maximum number of pagings.
The method of claim 4, wherein the method further comprises:

Receiving a downlink data notification message from the serving gateway;

Sending a response message to the serving gateway according to the downlink data notification message, where the response is cancelled The information carries the downlink data buffering time.
The method according to any one of claims 1 to 5, further comprising:

Receiving a paging response message of the second paging message;

Sending downlink data to the terminal according to the paging response message; or

And sending a notification message to the serving gateway according to the paging response message, to notify the serving gateway to send downlink data to the terminal.
The method according to any one of claims 1 to 5, further comprising:

Sending, to the second base station, a third paging message, where the third paging message includes a second coverage level, to notify the second base station to page the terminal under the second coverage level; the second coverage The level is less than or equal to the maximum coverage level supported by the second base station;

The second base station and the first base station belong to the same tracking area or the same tracking area list.
A coverage level based paging method, comprising:

Receiving, by the base station, a current coverage level of the terminal, and determining a maximum coverage level of the terminal;

Sending, by the base station, a current coverage level of the terminal and a maximum coverage level of the terminal to a core network device;

Receiving, by the base station, a first paging message from the core network device, where the first paging message includes a current coverage level of the terminal;

The base station pages the terminal under the current coverage level of the terminal;

Receiving, by the base station, a second paging message from the core network device, where the second paging message includes a first coverage level of the terminal, where the first coverage level is greater than a current coverage level of the terminal and is less than or Equal to the maximum coverage level of the terminal;

The base station pages the terminal under the first coverage level.
The method according to claim 8, wherein the current coverage level of the terminal and the maximum coverage level of the terminal are carried in a context content release completion message of the user equipment.
Method according to claim 8 or 9, characterized in that

The maximum coverage level of the terminal is the maximum coverage level supported by the base station.
A core network device, comprising: an interface and a processor:

The interface is configured to receive a current coverage level of the terminal and a maximum coverage level of the terminal from the first base station, and send the first paging message to the first base station, where the first paging message includes the terminal Current coverage level to notify the first base station to page the terminal under the current coverage level of the terminal;

The processor is configured to: if the paging response message of the first paging message is not received within a preset time, determine, according to a current coverage level of the terminal and a maximum coverage level of the terminal, a coverage level;

The interface is further configured to send a second paging message to the first base station, where the second paging message includes the first coverage level, to notify the first base station to search for the first coverage level. And calling the terminal; wherein the first coverage level is greater than a current coverage level of the terminal and less than or equal to a maximum coverage level of the terminal.
The core network device according to claim 11, wherein the maximum coverage level of the terminal is a maximum coverage level supported by the first base station.
The core network device according to claim 11 or 12, wherein the current coverage level of the terminal and the maximum coverage level of the terminal are carried in a context content release completion message of the user equipment.
The core network device according to any one of claims 11 to 13, wherein the processor is further configured to divide a maximum coverage level of the terminal and a current coverage level difference of the terminal by a step size. After rounding up, add 1 and multiply the number of paging times of each coverage level to obtain the maximum paging number of the terminal; and determine the buffering time of the downlink data according to the maximum paging number.
The core network device according to claim 14, wherein the interface is further configured to receive a downlink data notification message from the serving gateway, and configured to send a response message to the serving gateway according to the downlink data notification message, The response message carries the downlink data buffer time.
The core network device according to any one of claims 11 to 15, wherein the interface is further configured to receive a paging response message of the second paging message, and is configured to use, according to the paging response message, Sending the downlink data to the terminal; or the interface is further configured to send a notification message to the serving gateway according to the paging response message, to notify the serving gateway to send downlink data to the terminal.
The core network device according to any one of claims 11 or 15, wherein the interface is further configured to send a third paging message to the second base station, where the third paging message includes a second coverage level, Notifying the second base station to page the terminal at the second coverage level; the second coverage level is less than or equal to a maximum coverage level supported by the second base station; wherein the second base station and the second base station The first base station belongs to the same tracking area or the same tracking area list.
A base station, comprising: a receiver, a processor, and a transmitter:

The receiver is configured to receive a current coverage level of the terminal;

The processor is configured to determine a maximum coverage level of the terminal;

The transmitter is configured to send, to the core network device, a current coverage level of the terminal and a maximum coverage level of the terminal;

The receiver is further configured to receive a first paging message from the core network device, where the first paging message includes a current coverage level of the terminal;

The processor is further configured to page the terminal under a current coverage level of the terminal;

The receiver is further configured to receive a second paging message from the core network device, where the second paging message includes a first coverage level of the terminal, where the first coverage level is greater than a current coverage of the terminal Level and less than or equal to the maximum coverage level of the terminal;

The processor is further configured to page the terminal under the first coverage level.
The base station according to claim 18, wherein the current coverage level of the terminal and the maximum coverage level of the terminal are carried in a context content release complete message of the user equipment.
The base station according to claim 18 or 19, wherein the maximum coverage level of the terminal is a maximum coverage level supported by the base station.