CN117641577B

CN117641577B - Communication method and related equipment

Info

Publication number: CN117641577B
Application number: CN202410104761.5A
Authority: CN
Inventors: 单宝堃
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2024-01-25
Filing date: 2024-01-25
Publication date: 2024-06-11
Anticipated expiration: 2044-01-25
Also published as: CN117641577A

Abstract

The application provides a communication method and related equipment, comprising the following steps: the core network distributes a terminal identifier for the terminal, wherein the terminal identifier is used for paging the terminal based on a wake-up signal WUS, and the length of the terminal identifier is smaller than that of the S-TMSI of the terminal; the core network sends a terminal identification to the terminal; when paging a terminal in an idle state, the core network transmits a paging message to the base station, the paging message including a terminal identification.

Description

Communication method and related equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and related devices.

Background

When paging a terminal in an idle state, a paging message sent by a core network to a base station and a paging message sent by the base station to the terminal generally include a temporary mobile subscriber identity (subscriber temporary mobile subscriber identity, S-TMSI) used for identifying the terminal. The S-TMSI has a length of 48 bits,

In the case of directly waking up the terminal using a low power Wake Up Signal (WUS), WUS needs to carry the terminal identity. If the WUS is used to carry an existing terminal identity, for example, a 48-bit S-TMSI, the information amount of the terminal identity may exceed the maximum information amount that the WUS can carry, resulting in difficulty in implementation.

Disclosure of Invention

The application provides a communication method and related equipment, which realize the allocation of the identifier special for WUS paging, and the identifier of a new terminal with shorter length compared with S-TMSI is used under the scene of using the WUS to wake up the terminal to access a network, so that the information quantity of the WUS is reduced, and the difficulty of using the WUS to wake up the terminal directly is further reduced. The technical proposal is as follows.

A first aspect of the present application provides a communication method, the method comprising: the core network distributes a terminal identifier for the terminal, wherein the terminal identifier is used for paging the terminal based on a wake-up signal WUS, and the length of the terminal identifier is smaller than that of the S-TMSI of the terminal; the core network sends a terminal identification to the terminal; when paging a terminal in an idle state, the core network transmits a paging message to the base station, the paging message including a terminal identification.

The terminal identity is also called WUS identity or paging identity. In the method, the core network distributes the terminal identifier special for WUS paging for the idle terminal, and the length of the terminal identifier special for WUS paging is shorter than that of the existing S-TMS, so that the information quantity of the terminal identifier is reduced, the expenditure of the terminal identifier is reduced, the resources occupied by the receiving and transmitting terminal identifier when the WUS is used for directly waking up the terminal are further reduced, the information quantity of the WUS needing to carry the terminal identifier is further reduced, and the implementation difficulty of directly waking up the terminal by using the WUS is further reduced.

In some possible implementations, the core network sends a terminal identifier to the terminal, including: and the core network sends NAS signaling to the terminal, wherein the NAS signaling carries the terminal identification.

The terminal identification which is specially used for WUS paging is issued by multiplexing NAS signaling, the terminal identification is more matched with the interaction scene between the core network and the terminal, a new terminal identification which is specially used for WUS paging is not required to be defined by the NAS signaling, and the cost is low.

In some possible implementations, before the core network sends the terminal identifier to the terminal, the method further includes: the core network receives a capability identification from the terminal, the capability identification indicating that the terminal supports paging the terminal based on the wake-up signal WUS. Optionally, the capability identity indicates that the terminal supports reception of WUS containing a terminal identity shorter than the S-TMS length. Or the capability identity indicates that the terminal supports receiving a terminal identity shorter than the S-TMS length. The core network determines that the terminal supports paging the terminal based on the wake-up signal WUS based on the capability identification of the terminal, and then allocates a new terminal identification to the terminal. The terminal reporting capability identifier is equivalent to the notification that the core network home terminal supports WUS paging or supports receiving the WUS containing the shorter terminal identifier, and the core network can allocate a new terminal identifier for the terminal supporting WUS paging or the WUS needing to receive the shorter terminal identifier according to the requirements of the terminal, and does not need to allocate a new terminal identifier for the terminal not supporting WUS paging or the terminal not supporting to receive the terminal identifier shorter than the S-TMS length, thereby being beneficial to reducing the expenditure of the core network.

In some possible implementations, the core network receives a capability identification from the terminal, including: the core network receives NAS signaling from the terminal, and the NAS signaling carries a capability identifier.

In some possible implementations, the core network allocates a terminal identifier to the terminal, including: the core network intercepts at least one bit from the rightmost side of the S-TMSI of the terminal to obtain the terminal identification.

By truncating the S-TMSI to assign a new terminal identity, the existing S-TMSI can be reused to realize the identity dedicated to WUS paging without generating the new terminal identity from scratch, thereby reducing the overhead generated by assigning the new terminal identity.

A second aspect of the present application provides a communication method, the method comprising: the base station receives paging information from a core network, wherein the paging information comprises a terminal identifier, and the terminal identifier is used for paging the terminal based on a wake-up signal WUS; the base station generates WUS based on the terminal identification, wherein the WUS comprises the terminal identification; the base station transmits WUS to the terminal. In some possible implementations, the length of the terminal identity is smaller than the length of the S-TMSI of the terminal.

A third aspect of the present application provides a communication method, the method comprising: the terminal receives a terminal identifier from a core network, wherein the terminal identifier is used for paging the terminal based on a wake-up signal WUS, and the length of the terminal identifier is smaller than that of an S-TMSI of the terminal; the terminal receives WUS from the base station, wherein the WUS comprises a terminal identifier; the terminal sends a paging response to the base station, the paging response including the terminal identification.

In some possible implementations, the terminal sends a paging response to the base station, including: the terminal sends a message 3 (message 3) to the base station, the message 3 comprising the terminal identity.

In some possible implementations, before the terminal receives the terminal identification from the core network, the method further includes: the terminal sends a capability identification to the core network, the capability identification indicates that the terminal supports paging the terminal based on the wake-up signal WUS. In some possible implementations, the sending, by the terminal, the capability identification to the core network includes: and the terminal sends NAS signaling to the core network, wherein the NAS signaling carries the capability identifier.

A fourth aspect of the present application provides a communication method, the method comprising: the core network generates an interception instruction, the interception instruction is used for indicating an S-TMSI of an interception terminal to obtain a terminal identification, the terminal identification is used for paging the terminal based on a wake-up signal WUS, and the length of the terminal identification is smaller than that of the S-TMSI of the terminal; the core network sends an interception instruction to the terminal; when paging the terminal in idle state, the core network sends paging message to the base station, the paging message includes S-TMSI and interception instruction.

In some possible implementations, the interception indication includes an interception rule including at least one of an interception location or/and an amount of intercepted bits.

In some possible implementations, the interception rules include intercepting k bits from the rightmost side of the S-TMSI as the terminal identity, k being greater than 12.

In some possible implementations, the core network sends an interception indication to the terminal, including:

the core network sends NAS signaling to the terminal, wherein the NAS signaling carries an interception instruction.

A fifth aspect of the present application provides a communication method, the method comprising: the base station receives an interception instruction from a core network, wherein the interception instruction is used for indicating an S-TMSI of an interception terminal to obtain a terminal identifier, and the terminal identifier is used for paging the terminal based on a wake-up signal WUS; based on the interception instruction, the base station intercepts a terminal identifier from the S-TMSI of the terminal, wherein the length of the terminal identifier is smaller than that of the S-TMSI of the terminal; the base station generates WUS based on the terminal identification, wherein the WUS comprises the terminal identification; the base station transmits WUS to the terminal.

In some possible implementations, the interception indication includes an interception rule including at least one of an interception location and/or an amount of intercepted bits, and the base station intercepts the terminal identification from the S-TMSI of the terminal based on the interception indication, including:

The base station intercepts bits corresponding to the bit number from the interception position in the S-TMSI of the terminal to obtain the terminal identification.

A sixth aspect of the present application provides a communication method, the method comprising: the terminal receives an interception instruction from a core network, wherein the interception instruction is used for indicating an S-TMSI of the intercepted terminal to obtain a terminal identifier, and the terminal identifier is used for paging the terminal based on a wake-up signal WUS; based on the interception instruction, the terminal intercepts a terminal identifier from the S-TMSI of the terminal, and the length of the terminal identifier is smaller than that of the S-TMSI of the terminal; the terminal receives WUS from the base station, wherein the WUS comprises a terminal identifier; the terminal sends a paging response to the base station, the paging response including the terminal identification.

In some possible implementations, the interception indication includes an interception rule including at least one of an interception location and/or an amount of intercepted bits, and the terminal intercepts a terminal identification from an S-TMSI of the terminal based on the interception indication, including:

The terminal intercepts bits corresponding to the number of bits from the interception position in the S-TMSI of the terminal to obtain the terminal identification.

A seventh aspect of the present application provides an electronic device, comprising: a memory, and at least one processor. The memory is configured to store a program, and the at least one processor is configured to execute the program to cause the electronic device to implement the communication method provided in the first aspect of the present application.

An eighth aspect of the present application provides an electronic apparatus, comprising: a memory, and at least one processor. The memory is for storing a program and the at least one processor is for running the program to cause the electronic device to implement the communication method provided by the second aspect of the present application.

A ninth aspect of the present application provides an electronic apparatus, comprising: a memory, and at least one processor. The memory is for storing a program and the at least one processor is for running the program to cause the electronic device to implement the communication method provided by the third aspect of the present application.

A tenth aspect of the present application provides an electronic apparatus, comprising: a memory, and at least one processor. The memory is for storing a program and the at least one processor is for running the program to cause the electronic device to implement the communication method provided in the fourth aspect of the present application.

An eleventh aspect of the present application provides an electronic apparatus, comprising: a memory, and at least one processor. The memory is configured to store a program, and the at least one processor is configured to execute the program to cause the electronic device to implement the communication method provided in the fifth aspect of the present application.

A twelfth aspect of the present application provides an electronic device comprising: a memory, and at least one processor. The memory is configured to store a program, and the at least one processor is configured to execute the program to cause the electronic device to implement the communication method provided in the sixth aspect of the present application.

A thirteenth aspect of the present application provides a communication system comprising the electronic device as provided in the seventh aspect, the electronic device as provided in the eighth aspect, and the electronic device as provided in the ninth aspect.

A fourteenth aspect of the present application provides a communication system comprising the electronic device as provided in the tenth aspect, the electronic device as provided in the eleventh aspect, and the electronic device as provided in the twelfth aspect.

A fifteenth aspect of the present application provides a computer storage medium storing a computer program for implementing the communication method provided in any of the first to sixth aspects of the present application when the computer program is executed.

Drawings

Fig. 1 is a diagram illustrating a scenario in which a base station communicates with a terminal according to an embodiment of the present application;

FIG. 2 is a flow chart of paging (IDLE PAGING) in an idle state provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a WUS-based wake-up provided by an embodiment of the present application;

FIG. 4 is a flow chart of another communication method disclosed in an embodiment of the present application;

FIG. 5 is a flow chart of yet another communication method disclosed in an embodiment of the present application;

Fig. 6 is a diagram illustrating a structure of an electronic device according to an embodiment of the present application;

fig. 7 is a diagram illustrating a structure of another electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

The application scenario of the embodiment of the present application is illustrated below.

The embodiment of the application is applied to a communication system, which can be a second generation (2G) communication system and a third generation (3G) communication system, can be a long-term evolution (LTE) system, can be a fifth generation (5G) communication system, can be a mixed architecture of LTE and 5G, can be a 5G new wireless (5G New Radio,5G NR) system, can be a new communication system in future communication development, and the like.

The communication system comprises a terminal, a core network and a base station. The core network and the base station may be devices on the network side for providing network communication functions, sometimes referred to as network devices, network elements, which may typically be base stations (including functional units of base stations, or a combination of functional units of base stations) or core network units, wherein the core network units may be functional units in the core network, including but not limited to access and mobility management function (ACCESS AND mobility management function, AMF) units or session management function (session management function, SMF) units. A terminal may also be referred to as a device accessing a network. An example of a communication system is shown in fig. 1, which fig. 1 comprises a base station 1 and a terminal 2.

In the embodiment provided by the application, the base station may be any device with a wireless transceiving function, including but not limited to: an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in long term evolution (long term evolution, LTE), a base station (gNodeB or gNB) or transceiver point (transmission receiving point/transmission reception point, TRP) in New Radio (NR), a base station for 3GPP subsequent evolution, an access node in Wi-Fi system, a wireless relay node, a wireless backhaul node, etc. The base station may be: macro base station, micro base station, pico base station, small station, relay station, balloon station, or the like. A base station may include one or more co-sited or non-co-sited transmission points (Transmission Reception Point, TRP). The base station may also be a radio controller, a centralized unit (centralized unit, CU), and/or a Distributed Unit (DU) in the cloud radio access network (cloud radio access network, CRAN) scenario. The base station may communicate with the terminal or may communicate with the terminal through a relay station. The terminal may communicate with a plurality of base stations of different technologies, for example, the terminal may communicate with a base station supporting an LTE network, may communicate with a base station supporting a 5G network, and may perform dual connectivity with the base station supporting the LTE network and the base station supporting the 5G network.

In the embodiments provided by the present application, the terminal may be in various forms, such as a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a vehicle-mounted terminal device, a wireless terminal in unmanned (SELF DRIVING), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (SMART GRID), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (SMART CITY), a wireless terminal in smart home (smart home), a wearable terminal device, and the like. A terminal may also be referred to as a terminal device, user Equipment (UE), access terminal device, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, remote terminal device, mobile device, UE terminal device, wireless communication device, UE agent, UE apparatus, or the like. The terminal may also be a fixed terminal or a mobile terminal.

The embodiment of the application is suitable for being applied to a scene of paging by adopting a low-power consumption Wake Up Signal (WUS) aiming at an idle terminal. For ease of understanding, idle state terminal paging and WUS will be explained first.

In a cellular communication system such as 4G or 5G, a network serves a terminal in units of cells. After selecting a Cell, a terminal (UE) resides in the Cell, and can initiate uplink traffic at any time and prepare to receive downlink traffic of the network at any time. From the radio access network point of view, there are three different traffic states for a terminal in one cell.

Rrc_idle (IDLE state): the UE camps on a cell without ongoing traffic and is not visible to both the base station and the core network UE. The UE only monitors the system broadcast, ensures that the latest system information is stored at all times, so as to monitor paging (triggering cell access to perform uplink service) and initiate Random access (Random access) at any time as required, and actively accesses the network to perform uplink service

The page includes a downlink traffic trigger for the network, or a system message change, a multicast traffic start indication, etc.

Rrc_connected: the UE responds to the network paging or initiatively initiates random access, and establishes RRC connection with the base station to carry out service transmission. The UE is visible to both the base station and the core network.

Rrc_inactive (INACTIVE): the UE camps on a cell with no ongoing traffic, typically the base station configures the terminal to enter when the connection state is released. The terminal is still considered to be in a connected state for the core network, not visible to the base station. The UE behaves similarly to the idle state, mainly listening to paging and system messages, and differs from the RAN paging, which is mainly sent by the base station.

In a cellular system, no matter which state is adopted, for downlink control information and data sent by a base station, the terminal is considered to be possible to happen at any time from the macro time granularity, so that in theory, the UE needs to monitor various control channels and data channels at any time in a cell, and the downlink control information and data sent by a network are ensured not to be missed. However, for a terminal, the time for actually receiving the network downlink control information and data is relatively short, so that the monitoring logic has a great influence on the power consumption of the terminal, and a large amount of monitoring is idle.

Therefore, for part of downlink control information or data, 4G 5G designs DRX (Discontinuous Reception, discontinuous reception, especially from the terminal angle, namely discontinuous reception of downlink information) at the beginning of design, in DRX mechanism, base station and terminal transmit and receive according to period aiming at specific downlink control information or data in appointed form, reduce monitoring power consumption of terminal on the premise of meeting downlink delay, mainly comprising the following contents

The DRX of IDLE/INACTIVE is mainly called paging in the protocol. The terminal monitors the paging message which may exist at the appointed time-frequency position according to the period.

The DRX of the CONNECTED is mainly called DRX in the protocol. In the connection state service process, the terminal is not required to monitor the scheduling information continuously, but monitors according to the sparseness of the service and the period.

The aim of various periodic monitoring is to avoid the terminal to monitor downlink data and information continuously by the mode agreed by the terminal and the base station, so as to save the electric quantity of the terminal. Nevertheless, various discontinuous reception optimization schemes are continuously researched in the standard evolution of 3GPP, and two main directions are currently: aiming at the continuous optimization of the downlink DRX of the terminal view angle, the purpose is to continuously reduce the energy consumption consumed in the downlink monitoring process of the terminal through various optimizations. Rel-16/17 power saving, rel-18/19 low power Wake Up Signal (WUS)/Wake Up Receiver (WUR), and the like.

For terminals without services, it is not necessary to keep in a connected state all the time, occupying the radio resources of the base station. Under the condition that the terminal is only in the idle state and is in the cell, the terminal periodically monitors paging according to the paging flow and responds to the downlink service request of the network at any time.

Referring to fig. 2, fig. 2 is a flowchart of an idle state paging (IDLE PAGING) according to an embodiment of the present application, where the idle state paging procedure includes the following procedures.

The base station broadcasts paging related configuration to the terminal, wherein the paging related configuration comprises period, other time information, paging frequency domain resource information and the like. For example, the base station transmits a system information block (System Information Block, SIB) including paging related configuration.

The terminal receives the broadcasted SIB, and monitors Paging according to the information of the SIB configuration and the Paging period in a Paging subframe (PO) in a corresponding Paging frame (PAGING FRAME, PF).

In the corresponding PO, the terminal decodes the Physical downlink control channel (Physical Downlink Control Channel, PDCCH) using a Physical Random access radio network temporary identifier (P-RNTI), tries to receive downlink control information (Downlink Control Information, DCI) including paging message scheduling information, and if DCI is received, receives the paging message on the Physical downlink shared channel (Physical Downlink SHARED CHANNEL, PDSCH) according to the scheduling information of the DCI.

When the core network has downlink service, the core network sends paging information containing terminal identification to one or more base stations, and the terminal identification is S-TMSI. Since the idle state terminal is invisible to the core network, the core network may send paging messages containing the terminal identity to a possible plurality of base stations.

The base station receives the paging message containing the terminal identification, the base station determines the PO of the terminal according to the system broadcast configuration by itself by using the same method as the terminal as agreed by the 304 protocol, and sends the paging message containing the terminal identification, wherein the terminal identification is a temporary mobile subscriber identification (Subscriber Temporary Mobile Subscriber Identity, S-TMSI).

If the terminal receives the paging message at any time and the paging message contains the identifier of the terminal's own terminal, the terminal confirms that the terminal is paged, initiates a connection establishment (RRC conncection setup) request to establish connection with the base station and the core network, enters RRC_CONNECTED, and receives or transmits data.

After the service is completed, the base station releases the terminal by using RRC RELEASE messages, and the terminal recovers the idle state.

In the paging process, the terminal identifier carried in the paging message sent by the core network to the base station is S-TMSI, and the terminal identifier carried in the paging message sent by the base station to the terminal is S-TMSI. The S-TMSI is a terminal identification configured by an authentication management function (Authentication Management Function, AMF), and is unique in an AMF control area. The S-TMSI is typically 48 bits in length.

Rel-18/19 paging enhancement-WUS/WUR

Rel-19 introduces Wake up signal/receiver (WUS/WUR) to further reduce paging reception power consumption. In the paging mechanism before Rel-17, the terminal needs to monitor PDCCH before PO and PO, decode DCI of paging advance indication (PEI) or P-RNTI, and therefore needs to wake up the primary receiver before PO (MAIN RECEIVER, MR). In Rel-18, the introduction of lower power receivers, i.e. low power receivers (Low power Receiver, LR) or WUR, is considered. Such a receiver may receive simpler WUS (possibly only sequence dependent, without PDCCH decoding) and therefore lower power consumption. Thus, as shown in fig. 3, for a terminal that is not paged, it is only necessary to start LR before PO, detect WUS, and if not, continue dormancy. If WUS is detected, the MR is awakened and pages are listened to.

As a result of the above scene research analysis, the longer the length of the terminal identifier represents the information amount of the terminal identifier, the larger the information amount of the terminal identifier is represented, and the larger the resource required for receiving and transmitting the terminal identifier is. The WUS has limited amount of information that can be carried, so if a terminal is directly indicated to be paged by the WUS, this means that the WUS includes a terminal identifier of the terminal, and if the WUS uses an existing terminal identifier, it is difficult to design the WUS, because it is difficult to indicate 48 bits of information with a signal. Further, since WUS needs to carry more information, the overhead of WUS will be large, and the amount of resources needed to send and receive WUS will be large.

In view of this, in some embodiments of the present application, the network side (e.g., the core network or the base station) allocates a terminal identifier dedicated to WUS paging for the terminal in an idle state, where the length of the terminal identifier dedicated to WUS paging is shorter than that of the existing terminal identifier, so as to reduce the information amount of the terminal identifier, reduce the overhead of the terminal identifier, and further reduce the resources occupied by receiving and transmitting the terminal identifier when the WUS is used to directly wake up the terminal. For example, the length of the terminal identity is shorter than the 48-bit S-TMSI. The specific length of the terminal identity may be determined based on the accuracy requirements for identifying the terminal and the requirements for resource overhead.

The manner of allocating terminal identities for terminals in idle state includes the manner of allocating new terminal identities and truncating S-TMSI, which are illustrated by the embodiments of fig. 4 and 5, respectively.

Referring to fig. 4, fig. 4 shows a flow chart of a communication method according to an embodiment of the present application. The flow shown in fig. 4 is interactively performed by the core network, the terminal and the base station. The flow shown in fig. 4 includes the following steps.

Step S310, the terminal sends the capability identification to the core network.

The capability identity indicates that the terminal supports WUS paging based terminals, i.e. the terminal has WUS paging based capabilities. The terminal sends the capability identifier, which is equivalent to reporting the receiving capability supporting WUS paging to the core network, so that the core network perceives that the terminal can receive the WUS including the new terminal identifier, and triggers the core network to allocate the new terminal identifier to the terminal.

In some embodiments, the terminal generates and transmits upstream non-access stratum (network access stratum, NAS) signaling to the core network. The uplink NAS signaling carries the capability identification. For example, uplink NAS signaling carries a capability field. When the value of the capability field is 1, it indicates that the terminal supports paging the terminal based on WUS, that is, the uplink NAS signaling carries the capability identifier. When the value of the capability field is 0, it indicates that the terminal supports the WUS-based paging terminal, i.e. the uplink NAS signaling does not carry the capability identification.

In other embodiments, the terminal sends the capability identity through signaling other than NAS signaling.

In step S320, the core network allocates a new terminal identifier to the terminal.

In some embodiments, the core network receives a capability identification from the terminal, determines that the terminal supports the capability of paging the terminal based on WUS based on the capability identification, and performs the act of assigning the terminal identification.

In some embodiments, the step of assigning the terminal identity is performed by the AMF. Considering that the core network is generally responsible for sending the paging message by the AMF, the AMF is responsible for allocating a new terminal identifier, so that the AMF can perceive the new terminal identifier before paging the terminal, and in addition, the method is also helpful for distinguishing different terminals within the range of the AMF.

The new terminal identity is used for WUS based paging terminals. For example, a new terminal identification is used to be carried in WUS to wake up a specific terminal. The new terminal identity is different from the S-TMSI of the terminal. The new terminal identity has a length smaller than the length of the S-TMSI of the terminal. The new terminal identity is less than 48 bits in length. The new terminal identifier can uniquely identify the corresponding terminal within the control range of the core network (for example, AMF), in other words, the terminal identifiers of different terminals within the control range of the core network (for example, AMF) are different, so that the risk that the terminal a should be awakened and the terminal B should be awakened by mistake is reduced.

In step S330, the core network sends the new terminal identifier to the terminal.

In some embodiments, the core network generates downlink NAS signaling based on the allocated new terminal identification, and sends the downlink NAS signaling to the terminal. The downlink NAS signaling carries a new terminal identifier.

In other embodiments, the core network sends the new terminal identity through signaling other than NAS signaling. For example, a new terminal identity is carried by a new design of signaling.

In step S332, the terminal receives a new terminal identification from the core network.

In some embodiments, the terminal receives the downlink NAS signaling, and the terminal acquires a new terminal identifier carried by the downlink NAS signaling.

Step S340, when paging the idle state terminal, the core network sends a paging message to the base station. The paging message includes the new terminal identification of the idle state terminal.

In some embodiments, the paging message further includes an S-TMSI for the idle state terminal. Considering that the core network may not be able to perceive whether the base station supports paging based on WUS, the base station can adopt a WUS paging terminal based on a new terminal identifier and a traditional paging mode to page the terminal by carrying the S-TMSI and the new terminal identifier in the paging message, so that the flexibility is higher.

In some embodiments, the paging message further includes a paging type, the paging type identifying a paging mode. For example, the paging types include a first paging type indicating that the terminal is paged based on WUS and a second paging type indicating that the terminal is paged in a legacy paging manner.

In step S350, the base station receives the paging message from the core network.

In step S360, the base station generates WUS based on the new terminal identifier carried in the paging message.

The present embodiment is described by taking a WUS paging method as an example for a base station. In other embodiments, the base station adopts a conventional paging mode, the base station acquires the S-TMSI of the terminal carried in the paging message, and the terminal is paged based on the S-TMSI of the terminal by adopting the conventional paging mode.

How the base station determines which paging mode to employ includes a variety of implementations.

In some embodiments, the base station determines the paging mode to employ based on the indication carried in the paging message. For example, the base station acquires the paging type carried in the paging message. If the paging message carries the first paging type, the base station generates a WUS based on the new terminal identification, and the WUS is used for waking up the idle terminal. If the paging message carries the second paging type, the base station generates the paging message based on the S-TMSI of the terminal, wherein the paging message comprises the S-TMSI of the terminal, and the paging message is used for paging the terminal in a traditional paging mode.

In other embodiments, the base station determines the length of the terminal identifier carried in the paging message. If the length of the terminal identification is 48 bits, the base station determines that the terminal identification carried in the paging message is S-TMSI, and the base station pages the terminal by adopting a traditional paging mode based on the S-TMSI. If the length of the terminal identification is less than 48 bits, the base station determines that the terminal identification carried in the paging message is a new terminal identification for WUS paging, and the base station adopts WUS paging terminal based on the new terminal identification.

In other embodiments, the base station determines to use WUS paging mode or to use conventional paging mode based on configuration information maintained by the base station.

In other embodiments, the base station determines whether to employ WUS paging mode or conventional paging mode based on the paging capabilities of the base station. For example, if the base station supports the use of WUS paging terminals, the base station uses WUS paging terminals based on the new terminal identification. If the base station does not support the WUS paging terminal, the terminal is paged by adopting a traditional paging mode based on the S-TMSI of the terminal.

As another example, if the base station's functionality to employ WUS paging terminals has been activated, the base station employs WUS paging terminals based on the new terminal identification. If the function of the base station adopting the WUS paging terminal is not activated or fails, the base station adopts a traditional paging mode to page the terminal based on the S-TMSI of the terminal.

WUS is used to wake up the idle state terminal. WUS includes a new terminal identity. For example, WUS represents a terminal identity by a state of a value. For example, WUS includes a binarization sequence in which different values represent different information. For example, if the terminal identification has 10 bits, then the terminal identifications of all terminals total 210=1024, and the WUS sequence contains at least 1024 distinguishable different states, indicating the correct terminal.

In step S370, the base station transmits WUS.

In step S380, the terminal receives WUS.

The terminal includes a primary receiver and a low power consumption receiver. The terminal detects WUS through the low power receiver, and in response to detecting WUS, the terminal wakes up the main receiver and further listens for pages.

In step S390, the terminal determines that WUS includes the new terminal identifier of the home terminal, generates a paging response, and the paging response includes the new terminal identifier.

In some embodiments, the terminal determines the paging category the terminal listens to. If the monitored paging type is WUS paging, the terminal monitors WUS, the terminal determines whether the terminal identifier indicated by WUS is the new terminal identifier received in step S332, and if the terminal identifier indicated by WUS is the new terminal identifier received in step S332, the terminal determines that the local terminal is paged, and generates a paging response.

Because the paging response carries the terminal identification, the method is equivalent to informing the base station that the paging message sent previously by the base station has been responded by the terminal, and reduces the cost caused by repeatedly paging the same terminal by the base station.

In step S392, the terminal transmits a paging response to the base station.

In some embodiments, the paging response sent by the terminal is message 3, message 3 including the new terminal identity.

The implementation procedure for allocating a new terminal identifier in the embodiment of fig. 4 is illustrated above, and the implementation procedure for truncating S-TMSI in the embodiment of fig. 5 is illustrated below. The following fig. 5 embodiment, in which the same and similar parts as those of the fig. 4 embodiment are referred to, will focus on the differences from the fig. 4 embodiment described above.

Referring to fig. 5, fig. 5 shows a flow chart of a communication method according to an embodiment of the present application. The flow shown in fig. 5 is interactively performed by the core network, the terminal and the base station. The flow shown in fig. 5 includes the following steps.

In step S410, the terminal sends the capability identification to the core network.

The terminal reports the receiving capability supporting WUS paging to the core network by sending the capability identifier, so that the core network perceives that the terminal can receive the WUS comprising the new terminal identifier, and triggers the core network to instruct to truncate the S-TMSI.

In step S420, the core network generates an intercept indication.

The intercept indication is used to indicate the S-TMSI of the intercept terminal to obtain the terminal identity for WUS paging. The truncated indication may also be referred to as a truncated indication.

In some embodiments, the truncated indication indicates the rightmost k bits in the S-TMSI of the truncated terminal as the new terminal identity for WUS paging, k is greater than 1, k represents the number of truncated bits, and k also represents the length of the new terminal identity.

In some embodiments, the left-most k bits in the S-TMSI indicating the intercept terminal are used as new terminal identities for WUS paging, k being greater than 1.

In still other embodiments, the truncated indication indicates k bits in the middle of the S-TMSI for the truncated terminal as the new terminal identity for WUS paging, k being greater than 1.

By indicating to truncate the S-TMSI, the existing S-TMSI can be reused to realize the identification dedicated to WUS paging without retransmitting the new terminal identification to the terminal, thereby reducing signaling overhead generated by transmitting the new terminal identification among the terminal, the base station and the core network.

The truncated S-TMSI has similar functions to the allocated new terminal identification, and can also play a role in realizing a paging terminal based on WUS, and can also serve as a WUS identification or a paging identification. And the truncated S-TMSI is shorter than the original S-TMSI. The truncated S-TMSI can uniquely identify the corresponding terminal within the control range of the core network (e.g., AMF), in other words, the terminal identifiers (truncated S-TMSI) of different terminals within the control range of the core network (e.g., AMF) are different, so as to reduce the risk that the terminal a should be awakened and the terminal B should be awakened by mistake.

Step S430, the core network sends an interception instruction to the terminal.

In some implementations, the intercept indication includes an intercept rule. The intercept rules are used to indicate the manner in which the identity for WUS paging is intercepted from the S-TMSI. The intercept rules include parameters based on which the identity for WUS paging is intercepted from the S-TMSI. Illustratively, the interception rule includes at least one of an interception location and/or an intercepted number of bits. The core network makes the way of intercepting the identification for WUS paging from the S-TMSI more flexible and variable by sending the interception rules to the terminal.

The interception location refers to the location in the S-TMSI used to intercept the WUS paging identity. For example, the intercept position includes a start intercept position and an end cut-off position.

The start interception location is used to indicate a bit identifier in the S-TMSI corresponding to the start bit in the identifier of the new terminal. For example, the start intercept location is the bit index of the first bit of the new terminal identity (identity for WUS paging) in the S-TMSI. For example, the starting interception location is m, indicating that the interception of a new terminal identity starts from the mth bit in the S-TMSI. m may be any position in the S-TMSI.

The ending cut-off position is used for indicating bit identification corresponding to the last bit in the identification of the new terminal in the S-TMSI.

The number of bits truncated refers to the number of bits truncated in the S-TMSI as the identity for WUS paging. The number of bits intercepted is also the number of bits in the identity used for WUS paging. For example, the number of bits truncated is k, indicating that the length of the terminal identity for WUS paging is k bits.

In some embodiments, the interception rule includes intercepting k bits from the rightmost side of the S-TMSI as the terminal identification. For example, the intercept rules include intercepting 20 bits from the rightmost side of the S-TMSI as the terminal identity, indicating that the 29 th bit through 48 th bit of the intercept S-TMSI is the identity for WUS paging.

In other embodiments, the intercept rules are not included in the intercept indication. For example, the intercept indication is an opcode corresponding to the intercept operation. As another example, the intercept indication is 1, indicating that the S-TMSI of the terminal is intercepted to obtain the terminal identification for WUS paging.

In some embodiments, the core network generates downlink NAS signaling based on the intercept indication and sends the downlink NAS signaling to the terminal. The downlink NAS signaling carries an intercept indication.

In other embodiments, the core network sends the new intercept indication through other signaling than NAS signaling. For example, the interception indication is carried by a new design of signaling.

In step S432, the terminal receives an interception instruction from the core network.

In some embodiments, the terminal receives the downlink NAS signaling, and the terminal acquires an interception instruction carried by the downlink NAS signaling.

In step S434, the terminal intercepts a new terminal identifier from the S-TMSI of the terminal based on the interception indication, and the length of the new terminal identifier is smaller than the length of the S-TMSI of the terminal.

For example, the terminal intercepts k rightmost bits in the S-TMSI of the terminal as a new terminal identifier; in another example, the terminal intercepts the leftmost k bits in the S-TMSI of the terminal as a new terminal identifier. For another example, the terminal intercepts k bits in the middle of the S-TMSI of the terminal as a new terminal identifier.

In some embodiments, the terminal acquires the interception rule carried by the interception instruction, and intercepts the new terminal identifier from the S-TMSI of the terminal according to the interception position or/and the intercepted bit number in the interception rule.

Illustratively, the interception position in the interception instruction is the mth bit, the number of the intercepted bits is k, the terminal intercepts k bits from the mth bit in the S-TMSI, and takes the mth bit to the (m+k-1) th bit in the S-TMSI as a new terminal identifier.

Illustratively, the starting interception position in the interception instruction includes an mth bit, the ending interception position is an nth bit, the terminal intercepts from the mth bit in the S-TMSI until the interception of the nth bit in the S-TMSI is ended, and the mth bit to the nth bit in the S-TMSI are used as new terminal identifiers.

In other embodiments, the interception indication itself does not include an interception rule, and the terminal intercepts a new terminal identification from the S-TMSI of the terminal according to an interception rule pre-stored by the terminal. For example, the interception rules are provided by standard protocols. As another example, the intercept rule is one of a plurality of candidate values in a table configured by the base station. As another example, the interception rules are determined by the terminal negotiating with the base station.

In step S440, when paging the idle terminal, the core network sends a paging message to the base station. The paging message includes an intercept indication.

The interception indication sent by the core network to the base station is the same as the interception indication sent by the core network to the terminal in step S430. Because the core network sends the same interception instruction to the terminal and the base station respectively, the terminal and the base station intercept new terminal identifications from the S-TMSI in the same interception mode based on the same interception instruction.

For example, the core network sends the same interception position and the same number of bits to the terminal and the base station respectively, so that the terminal and the base station intercept the same number of bits from the same position in the S-TMSI to obtain the same terminal identifier for WUS paging.

In step S450, the base station receives the paging message from the core network, and the base station obtains the interception instruction carried in the paging message.

In step S452, the base station intercepts a new terminal identification from the S-TMSI of the terminal based on the interception instruction.

In some embodiments, the new terminal identity is less than the length of the S-TMSI of the terminal.

In step S460, the base station generates WUS based on the new terminal identification.

WUS is used to wake up the idle state terminal. WUS includes a new terminal identity.

In step S470, the base station transmits WUS to the terminal.

In step S480, the terminal receives WUS from the base station. WUS includes a new terminal identity.

In step S490, the terminal determines that WUS includes the new terminal identifier of the home terminal, generates a paging response, and the paging response includes the new terminal identifier.

In step S492, the terminal transmits a paging response to the base station.

The obtained terminal identification can be used for paging the terminal based on WUS whether a new terminal identification allocation mode or a shortened S-TMSI mode is adopted.

Further, whether a new terminal identifier is allocated or a truncated S-TMSI is adopted, the obtained terminal identifier is shorter than the S-TMSI in length, so that the information quantity of the WUS carrying the terminal identifier can be reduced.

Fig. 6 is a composition example of an electronic device according to an embodiment of the present application. The electronic device may be a base station, a core network or a terminal, taking the electronic device as an example of a base station. Fig. 6 shows a simplified schematic diagram of a base station structure. The base station includes portions 610, 620 and 630. The 610 part is mainly used for baseband processing, control of the base station, etc.; portion 610 is typically a control center of the base station, and may be generally referred to as a processor, for controlling the base station to perform the processing operations on the base station side in the above-described method embodiment. Section 620 is mainly used for storing computer program code and data. The 630 part is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals; section 630 may be generally referred to as a transceiver module, transceiver circuitry, or transceiver, etc. The transceiver module of section 630, which may also be referred to as a transceiver or transceiver, includes an antenna 633 and radio frequency circuitry (not shown) that is primarily used for radio frequency processing. Alternatively, the means for implementing the receiving function in section 630 may be regarded as a receiver and the means for implementing the transmitting function as a transmitter, i.e. section 630 comprises a receiver 632 and a transmitter 631. The receiver may also be referred to as a receiving module, receiver, or receiving circuit, etc., and the transmitter may be referred to as a transmitting module, transmitter, or transmitting circuit, etc.

Portions 610 and 620 may include one or more boards, each of which may include one or more processors and one or more memories. The processor is used for reading and executing the program in the memory to realize the baseband processing function and control of the base station. If there are multiple boards, the boards can be interconnected to enhance processing power. As an alternative implementation manner, the multiple boards may share one or more processors, or the multiple boards may share one or more memories, or the multiple boards may share one or more processors at the same time.

For example, in one implementation, the transceiver module of section 630 is configured to perform the transceiver-related procedures performed by the base station in the foregoing method embodiments. The processor of portion 610 is configured to perform the processes associated with the processing performed by the base station in the foregoing method embodiments.

It should be understood that fig. 6 is merely an example and not a limitation, and that the network device including the processor, memory, and transceiver described above may not rely on the structure shown in fig. 6.

Fig. 7 is a composition example of another electronic device provided in an embodiment of the present application. The electronic device may be a terminal, including but not limited to, a mobile phone, a smart wearable device (e.g., a smart watch), and the like. In the following, taking a mobile phone as an example, the electronic device may include a processor 310, an external memory interface 320, an internal memory 321, a display 330, a camera 340, an antenna 1, an antenna 2, a mobile communication module 350, a wireless communication module 360, and the like.

It is to be understood that the structure illustrated in the present embodiment does not constitute a specific limitation on the electronic apparatus. In other embodiments, the electronic device may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 310 may include one or more processing units, such as: the processor 310 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a video codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural-Network Processor (NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

It should be understood that the connection relationship between the modules illustrated in this embodiment is only illustrative, and does not limit the structure of the electronic device. In other embodiments of the present application, the electronic device may also use different interfacing manners, or a combination of multiple interfacing manners in the foregoing embodiments.

The external memory interface 320 may be used to connect an external memory card, such as a Micro SD card, to enable expansion of the memory capabilities of the electronic device. The external memory card communicates with the processor 310 through an external memory interface 320 to implement data storage functions. For example, files such as music, video, etc. are stored in an external memory card.

The internal memory 321 may be used to store computer executable program code that includes instructions. The processor 310 executes various functional applications of the electronic device and data processing by executing instructions stored in the internal memory 321. The internal memory 321 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data created during use of the electronic device (e.g., audio data, phonebook, etc.), and so forth. In addition, the internal memory 321 may include a high-speed random access memory, and may also include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and the like. The processor 310 performs various functional applications of the electronic device and data processing by executing instructions stored in the internal memory 321, and/or instructions stored in a memory provided in the processor.

The wireless communication function of the electronic device may be implemented by the antenna 1, the antenna 2, the mobile communication module 350, the wireless communication module 360, a modem processor, a baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the electronic device may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 350 may provide a solution for wireless communication including 2G/3G/4G/5G, etc. applied on an electronic device. The mobile communication module 350 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), or the like. The mobile communication module 350 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 350 may amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate the electromagnetic waves. In some embodiments, at least some of the functional modules of the mobile communication module 350 may be disposed in the processor 310. In some embodiments, at least some of the functional modules of the mobile communication module 350 may be provided in the same device as at least some of the modules of the processor 310.

In some embodiments, the electronic device initiates or receives a call request through the mobile communication module 350 and the antenna 1.

In addition, an operating system is run on the components. Such as iOS operating systems, android operating systems, windows operating systems, etc. Running applications may be installed on the operating system. It can be clearly understood by those skilled in the art that, for convenience and brevity, any explanation and beneficial effects of the related content in the electronic device provided above may refer to the corresponding method embodiments provided above, and are not repeated herein.

The present application also provides a communication system that may include an electronic device (e.g., a network device such as a base station, a core network, etc.) as shown in fig. 6 and an electronic device (e.g., a terminal such as a mobile phone) as shown in fig. 7.

In the present application, the terminal, the core network, or the base station may include a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer may include a central processing unit (central processing unit, CPU), a memory management module (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system of the operating system layer may be any one or more computer operating systems that implement business processing through processes (processes), for example, a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or windows operating system, etc. The application layer may include applications such as a browser, address book, word processor, instant messaging software, and the like.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are referred to each other, and each embodiment is mainly described as a difference from other embodiments.

A refers to B, referring to a simple variation where A is the same as B or A is B.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.

The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.

The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, a substantial portion of the technical solution of the present application, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the procedures of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the technical scope of the embodiments of the present application.

Claims

1. A method of communication, the method comprising:

the core network receives a capability identifier from a terminal, wherein the capability identifier indicates that the terminal supports paging the terminal based on a wake-up signal WUS;

the core network determines that the terminal supports WUS-based paging based on the capability identification;

The core network generates an interception rule, wherein the interception rule is used for intercepting a temporary mobile subscriber identity S-TMSI of a terminal to obtain a terminal identity, the interception rule comprises an interception position and the number of intercepted bits, the terminal identity is used for paging the terminal based on a wake-up signal WUS, and the length of the terminal identity is smaller than that of the S-TMSI of the terminal;

the core network sends the interception rule to the terminal;

And when paging the terminal in an idle state, the core network sends a paging message to a base station, wherein the paging message comprises the S-TMSI, a first paging type and the interception rule, and the first paging type indicates paging the terminal based on WUS.

2. The method of claim 1, wherein the interception rule comprises intercepting k bits from a rightmost side of the S-TMSI as the terminal identity, the k being greater than 12.

3. The method according to claim 1, wherein the core network sending the interception rule to a terminal comprises:

And the core network sends NAS signaling of a non-access stratum to the terminal, wherein the NAS signaling carries the interception rule.

4. A method of communication, the method comprising:

The base station receives paging information from a core network, wherein the paging information comprises a temporary mobile subscriber identity S-TMSI of a terminal, a paging type and an interception rule, the interception rule is used for intercepting the S-TMSI of the terminal to obtain a terminal identity, the interception rule comprises an interception position and the number of intercepted bits, and the terminal identity is used for paging the terminal based on a wake-up signal WUS;

If the paging type is a first paging type, the base station intercepts bits corresponding to the number of bits from the interception position of the S-TMSI of the terminal based on the interception rule to obtain the terminal identification, wherein the first paging type indicates a terminal based on WUS paging, and the length of the terminal identification is smaller than that of the S-TMSI of the terminal;

The base station generates a WUS based on the terminal identity, the WUS including the terminal identity;

The base station transmits the WUS to the terminal.

5. A method of communication, the method comprising:

The terminal sends a capability identifier to a core network, wherein the capability identifier indicates that the terminal supports paging the terminal based on a wake-up signal WUS;

The terminal receives an interception rule from the core network, wherein the interception rule is used for intercepting an S-TMSI of the terminal to obtain a terminal identifier, the interception rule comprises an interception position and an intercepted bit number, and the terminal identifier is used for paging the terminal based on a wake-up signal WUS;

based on the interception rule, the terminal intercepts bits corresponding to the number of bits from the interception position of the S-TMSI of the terminal to obtain the terminal identifier, wherein the length of the terminal identifier is smaller than that of the S-TMSI of the terminal;

the terminal receives a WUS from a base station, the WUS including the terminal identity;

And the terminal sends a paging response to the base station, wherein the paging response comprises the terminal identification.

6. An electronic device, the electronic device comprising:

A memory for storing a computer program or computer instructions;

A processor for executing a computer program or computer instructions stored in the memory, causing the electronic device to perform the method of any one of claims 1 to 5.

7. A communication system, characterized in that the system comprises a terminal, a core network and a base station, the system being adapted to perform the method according to any of claims 1 to 5.

8. A computer storage medium storing a computer program for implementing the method of any one of claims 1 to 5 when executed.