Patent Description:
A Network Slice usually refers to slicing a hardware infrastructure into multiple virtual end-to-end networks, each slice can have independent network resources, and all slices are logically isolated from each other. If one of the slices fails, the operations of the other slices will not be affected. Combined with the application scenario of the fifth generation mobile communication system (<NUM>), operators can define different slices according to different service types, which can satisfy the different requirements of different users for delay, throughput, capacity, efficiency and the like, and bring better experience to users.

When the terminal device needs to use one or more network slices, the terminal device needs to request the use of the slices from network device first. After the network device agrees, the terminal device can establish a session and transmit data in the slices. However, there is a situation that when the terminal device has a new service demand and enters the connected mode, an accessed cell may not support the network slice required for the new service, which leads to the failure to successfully complete the new service, thereby reducing the user experience.

Document <CIT>) discloses a network access method and a communication device, and the method comprises the steps: obtaining, by terminal device, a first frequency point list after determining a first frequency point cell, wherein the first frequency point list comprises at least one frequency point, and it is determined by the terminal device that each frequency point contained in the first frequency point list does not support a slicing service requested by the terminal device; and if the first frequency point corresponding to the first frequency point cell is located in the first frequency point list, determining a second frequency point cell, wherein the second frequency point corresponding to the second frequency point cell is not located in the first frequency point list.

Document <CIT>) discloses a cell reselection method and device, and communication equipment. The cell reselection method, applied to a terminal, includes: receiving system messages, wherein the system messages include network slice information of network slices supported by neighboring cells; and performing cell reselection according to the network slice information.

In view of this, embodiments of the present disclosure provide a method for entering a connected mode, a terminal device and a chip mounted on the terminal device, which can optimize a mechanism for the terminal device to enter the connected mode.

With the embodiments of the present disclosure, the terminal device does not directly enter the connected mode when the service transmission requirements occurs in an idle mode or an inactive mode, but the terminal device determines, based on the network slice information that needs to be used, whether to perform a cell reselection, so that a suitable cell can be selected before entering the connected mode. In this way, it can be ensured that the accessed cell supports the network slice required for a current service after the terminal device enters the connected mode, and the service interruption caused by the cell reselection can be avoided after the terminal device accesses the cell.

The technical solutions in the embodiments of the present disclosure will be described below with reference to the accompanying drawings in the embodiments of the present disclosure.

The technical solutions of the embodiments of the present disclosure can be applied to various communication systems, such as: New Radio (NR) system, an evolution system of the NR system, a NR-based access to unlicensed spectrum (NR-U) system, a Non-Terrestrial Networks (NTN) system, a Wireless Local Area Network (WLAN), a Wireless Fidelity (WiFi), a 5th-Generation (<NUM>) system or other communication systems, and the like.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. Embodiments of the present disclosure can also be applied to these communication systems.

In the embodiment of the present disclosure, the communication system can be applied to a Carrier Aggregation (CA) scenario, a Dual Connectivity (DC) scenario, and a Standalone (SA) network distribution scenario.

Embodiments of the present disclosure describe various embodiments in conjunction with a terminal device. The terminal device may also be referred to as User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile radio station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, a user device or a vehicle, etc..

In an embodiment of the present disclosure, the terminal device may be a station (ST) in a WLAN, and may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) telephone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device having wireless communication function, a computing device or another processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in the next-generation communication system such as an NR network, or a terminal device in the future evolved Public Land Mobile Network (PLMN) network.

In an embodiment of the present disclosure, the terminal device may be deployed on land including indoors or outdoors, hand-held, wearable or vehicle-mounted. The terminal device can also be deployed on the water (such as ships, and the like). The terminal device can also be deployed in the air (such as airplanes, balloons and satellites, and the like).

In an embodiment of the present disclosure, the terminal device can be a Mobile Phone, a Pad, a computer with a wireless transceiver function, a Virtual Reality (VR) terminal device, a Augmented Reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city or smart home, etc..

In an embodiment of the present disclosure, the terminal device may also be a wearable device. The wearable device may also be called a wearable intelligent device, which is generic term of a wearable device developed by applying wearable technology to intelligently design daily wear, such as glasses, gloves, watches, clothing and shoes. The wearable device is a portable device that is worn on the body directly or integrated into user's clothes or accessories. The wearable device is not only a hardware device, but also a powerful function realized through software support, data interaction and cloud interaction. A generalized wearable intelligent device includes full-featured, large size and complete or partial functions realized without relying on smart phones, such as smart watches or smart glasses, and includes only a certain application function, which is necessary to be used in conjunction with other devices such as a smart phone, such as various smart bracelets for monitoring physical signs, or smart jewelry and the like.

In an embodiment of the present disclosure, the network device may be a device that communicates with a mobile device. The network device may be an Access Point (AP) in the WLAN, a Base Transceiver Station (BTS) in the GSM or the CDMA, a NodeB (NB) in the WCDMA, an Evolved Node B (eNB or eNodeB) in the LTE, a relay station or an access point, a vehicle-mounted device, a wearable device, a network device (gNB) in a NR network, a network device in the future evolved PLMN network or the like.

In embodiments of the present disclosure, the network device may have mobility characteristics, for example, the network device may be a mobile device. In one example, the network device may be a satellite or a balloon station. For example, the satellite may be a Low Earth Orbit (LEO) satellite, a Medium Earth Orbit (MEO) satellite, a Geostationary Earth Orbit (GEO) satellite, a High Elliptical Orbit (HEO) satellite, and the like. In one example, the network device may also be a base station arranged on land, water and the like.

In an embodiment of the present disclosure, the network device provides services for a cell, and the terminal device communicates with the network device through transmission resources used by the cell (such as, frequency domain resources or spectrum resources). The cell may be a cell corresponding to the network device (such as, a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell. The small cell here may include a metro cell, a micro cell, a pico cell, or a femto cell and the like. These small cells have characteristics of small coverage and low transmission power, which are suitable for providing high-speed data transmission services.

It is to be understood that terms "system" and "network" in the disclosure may usually be exchanged in the disclosure. In the disclosure, term "and/or" is only an association relationship describing associated objects, for example, represents that previous and next associated objects may have three relationships. For example, A and/or B may represent three conditions: i.e., independent existence of A, existence of both A and B, and independent existence of B. The character "/" in the disclosure usually represents that previous and next associated objects form an "or" relationship. In the description of embodiments of the present disclosure, the term "correspondence" may indicate a direct or indirect correspondence between the two elements, or may indicate an association between the two elements, or may indicate a relationship of indicating and being indicated, configuring and being configured, etc..

In order to clearly illustrate the ideas of the embodiments of the present disclosure, the contents related to the terminal device entering the connected mode in the communication system is described in brief firstly.

<FIG> shows a system architecture diagram of a <NUM> network where a network slice has been deployed. <FIG> shows an architectural of a network slice. In <FIG>, a network slice <NUM> and a network slice <NUM> are provided, each network slice includes an Access and Mobility Management Function (AMF), a Session Management Function (SMF) and a User Plane Function (UPF). Different network slices can share a same AMF.

A network slice can be identified by Single Network Slice Selection Assistance Information (S-NSSAI). Considering a scenario where the UE may use multiple network slices, an NSSAI may be used to represent a set of S-NSSAIs, and the NSSAI indicates one or more S-NSSAIs.

When the UE needs to use one or more network slices according to a service requirement, the UE needs to request the network to use slices firstly, and specifically the following three processes can be performed.

During network deployment, the coverage of each slice may be different. When the core network device such as the AMF determines the allowed NSSAI, it is needed to ensure that all slices indicated by the allowed NSSAI can cover a "Registration area" (such as tracking area TA list) allocated by AMF to UE. The AMF can obtain the S-NSSAI of one or more network slices supported by the base station and corresponding Tracking Area (TA) information from the base station through a "NG setup request" signaling or a "RAN configuration update" signaling.

For the UE in the idle mode or in the inactive mode, with regard to the allowed NSSAI, the following processing can be performed: the UE in the idle mode or in the inactive mode can obtain information about one or more slices supported by the base station and priority information of frequencies supported by the slices by reading the information broadcast by the cell; and the UE in the idle mode or in the inactive mode selects a slice supporting the current service and a cell corresponding a frequency with a high priority. The non-access stratum (NAS) layer of the UE can provide allowed NSSAI to the access layer, thereby ensuring that the UE can select a suitable cell for access to prepare for subsequent service transmission.

When a new service requirement occurs for the UE in the idle mode or in the inactive mode and a network slice corresponding to the service is not one of the one or more network slices indicated by the allowed NSSAI, the UE still needs to access a currently selected cell firstly (only allowed NSSAI is considered), after a connection with the network is established, the UE requests a new network slice from the core network device. However, the currently accessed cell may not support the new network slice or the currently accessed cell is not the cell with a high priority frequency corresponding to the new network slice. The network may reject the new network slice requested by the UE, and release the connection to make the UE enter the idle mode, then the UE needs to perform cell reselection again to access a suitable cell. The above process may cause the interruption of the UE service, affect the user experience and waste signaling.

To this end, embodiments of the present disclosure provide a method for entering a connected mode, which is applied to a terminal device. With reference to <FIG>, the method includes the following operation.

In S101, before the terminal device enters the connected mode, the terminal device determines, based on information of a network slice that needs to be used, whether to perform a cell reselection before entering the connected mode.

Before entering the connected mode includes a duration between a time when the terminal device has a service requirement and a time before the terminal device enters the connected mode; or a duration between a time after an access layer of the terminal device receives a trigger from an NAS layer and a time before the terminal device enters the connected mode. That is to say, when a new service transmission requirement occurs or an access layer is triggered, the UE does not directly enter the connected mode, but the UE first determines, based on information of a network slice that needs to be used, whether to perform a cell reselection before entering the connected mode, so that a suitable cell can be selected before entering the connected mode. In this way, it can be ensured that the accessed cell supports the network slice required for a current service after the terminal device enters the connected mode, and the service interruption caused by the cell reselection can be avoided after the terminal device accesses the cell, which affects the user experience.

According to the embodiment of the present disclosure, optionally, the information of the network slice that needs to be used includes at least one of: information of a network slice that needs to be used by a current service of the terminal device; allowed NSSAI; or network slice information of a PDU session.

According to an embodiment of the present disclosure, optionally, the access layer or the NAS layer of the terminal device may determine whether to perform the cell reselection before entering the connected mode. Multiple embodiments are provided below to describe the implementations.

Manner <NUM>, the access layer determines whether to perform the cell reselection before entering the connected mode.

According to an embodiment of the present disclosure, optionally, it is assumed that the current service of the terminal device needs to use a first network slice, any one of the following four processes may be performed.

According to an embodiment of the present disclosure, optionally, after the access layer of the terminal device receives the information of the first network slice sent by the NAS layer, when the information of the first network slice is in the one or more network slices indicated by the allowed NSSAI and when a priority of a frequency corresponding to the first network slice of a camping cell (i.e., a cell on which the terminal device is currently camping) is higher, the access layer of the terminal device determines that no cell reselection is performed before entering the connected mode.

In this case, optionally, the case where the priority of the frequency corresponding to the first network slice of the camping cell is higher may be any one of the following two cases.

The camping cell supports the first network slice, and the camping cell is a cell with the highest priority of the frequency corresponding to the first network slice.

·The camping cell supports the first network slice, and the camping cell is not a cell with the lowest priority of the frequency corresponding to the first network slice.

For example, the frequency <NUM> corresponding to the first network slice has a highest priority, the frequency <NUM> has a lowest priority, and the priority of the frequency <NUM> is between the highest priority and the lowest priority. Then the camping cell can be a cell corresponding to the frequency <NUM> or a cell corresponding to the frequency <NUM>.

According to an embodiment of the present application, optionally, after the access layer of the terminal device receives the information of the first network slice sent by the NAS layer, the access layer of the terminal device determines to perform the cell reselection before entering the connected mode, when at least one of the following is satisfied: the information of the first network slice is not in the one or more network slices indicated by the allowed NSSAI; or the priority of the frequency corresponding to the first network slice of the camping cell is lower.

In this case, optionally, the case where the priority of the frequency corresponding to the first network slice of the camping cell is lower may be any one of the following two cases.

·The camping cell supports the first network slice, and the camping cell is the cell with the lowest priority of the frequency corresponding to the first network slice.

·The camping cell supports the first network slice, and the camping cell is not the cell with the highest priority of the frequency corresponding to the first network slice.

For example, the frequency <NUM> corresponding to the first network slice has the highest priority, the frequency <NUM> has the lowest priority, and the priority of the frequency <NUM> is between the highest priority and the lowest priority. Then the camping cell can be the cell corresponding to the frequency <NUM> or the cell corresponding to the frequency <NUM>.

According to the embodiment of the present disclosure, optionally, if the access layer of the terminal device determines to perform the cell reselection before entering the connected mode, when the terminal device performs the cell reselection, the terminal device selects a cell with a highest priority of the frequency corresponding to the first network slice among cells supporting the first network slice to enter the connected mode.

Manner <NUM>: The NAS layer determines whether to perform the cell reselection before entering the connected mode.

According to an embodiment of the present application, optionally, after the access layer of the terminal device selects the camping cell, the access layer sends information of the network slice supported by the camping cell and priority information of a frequency corresponding to the network slice supported by the camping cell to the NAS layer.

According to an embodiment of the present disclosure, optionally, the access layer also sends information of a network slice supported by a neighbour cell of a camping cell and priority information of a frequency corresponding to the network slice supported by the neighbour cell to the NAS layer.

According to an embodiment of the present disclosure, optionally, it is assumed that a current service of the terminal device needs to use a second network slice, the following processing can be performed. The NAS layer determines whether to perform the cell reselection before entering the connected mode by determining whether the camping cell supports the second network slice and whether a frequency corresponding to the camping cell has a highest priority.

Optionally, further processing can be performed according to any one of the following two situations.

According to an embodiment of the present disclosure, the access layer optionally determines, according to an instruction of the NAS layer, to perform the cell reselection or not to perform the cell reselection before entering the connected mode.

According to an embodiment of the present disclosure, the access layer of the terminal device can select the network slice supporting the new service and the cell with the highest priority of the frequency before entering the connected mode, thus avoiding unnecessary cell re-selection, thereby ensuring that the subsequent session establishment and service transmission are not affected.

The implementations of the method for entering the connected mode according to the embodiments of the present disclosure has been described above by the embodiments, and the specific implementation process of the embodiments of the present disclosure will be described below by multiple specific examples.

In this example, the access layer of the terminal device determines whether to perform a cell reselection before entering the connected mode. <FIG> schematically shows a process of a terminal device entering a connected mode according to an embodiment of the present disclosure. The processing procedure disclosed in this example is described below according to <FIG>.

In this example, the NAS layer of the terminal device determines whether to perform the cell reselection before entering the connected mode. <FIG> schematically shows a process of a terminal device entering a connected mode according to an embodiment of the present disclosure. The processing procedure disclosed in this example is described below according to <FIG>.

Taking <FIG> as an example, the process of cell reselection will be explained below. The UE in <FIG> is located in an area jointly covered by cell <NUM> and cell <NUM>. The cell <NUM> supports slice <NUM> and slice <NUM>.

·The slice <NUM> supports frequency <NUM> and frequency <NUM>, and the priority of frequency <NUM> is higher than that of frequency <NUM>.

In <FIG>, the cell <NUM> supports slice <NUM> and slice <NUM>.

·The slice <NUM> supports frequency <NUM>.

For the UE in <FIG>, when the UE is in the idle mode or in the inactive mode, the UE can obtain the above slice information of the cell <NUM> and the cell <NUM> through the system broadcast. According to the above at least one embodiment of the present disclosure, if UE determines that the cell reselection is performed before entering the connected mode, and the current service of the UE needs to use the slice <NUM>, then the cell (cell <NUM>) corresponding to the frequency <NUM> with higher priority in the slice <NUM> is selected for access. If the current service of the UE needs to use the slice <NUM>, the cell (cell <NUM>) corresponding to the frequency <NUM> with higher priority in the slice <NUM> is selected for access.

According to at least one embodiment of the present disclosure, the access layer can select the cell supporting the slice of the new service and corresponding to the frequency with the highest priority in the slice before entering the connected mode, so as to ensure that the processes of the subsequent session establishment and the service transmission are not interrupted due to the cell reselection.

The specific arrangements and implementations of the embodiments of the present disclosure have been described above from different aspects through multiple embodiments. The embodiments of the present disclosure also provide a terminal device <NUM> corresponding to the processing method of at least one embodiment described above, with reference to <FIG>, the terminal device <NUM> includes a determining module <NUM>.

The determining module <NUM> is configured to determine, based on information of a network slice that needs to be used, whether to perform a cell reselection before entering the connected mode, before the terminal device enters the connected mode.

Optionally, the determining module includes an access layer logic module. The access layer logic module is configured to determine, based on the information of the network slice that needs to be used, whether to perform the cell reselection before entering the connected mode.

Optionally, the determining module also includes a non-access layer logic module. In a case where a current service of the terminal device needs to use a first network slice, when the terminal device determines that the first network slice is a network slice among one or more network slices indicated by an allowed NSSAI, the non-access layer logic module is configured to send information of the first network slice to the access layer logic module; or, when the terminal device determines that the first network slice is a network slice among one or more network slices indicated by an allowed NSSAI, the non-access layer logic module is configured to send, no information of a network slice to the access layer logic module.

Optionally, the determining module also includes a non-access layer logic module. In a case where a current service of the terminal device needs to use a first network slice, when it is determined that the first network slice is not a network slice among one or more network slices indicated by an allowed NSSAI, the non-access layer logic module of the terminal device is configured to send information of the first network slice to the access layer logic module; or when it is determined that the first network slice is not a network slice among one or more network slices indicated by an allowed NSSAI, the non-access layer logic module is configured to send information of the first network slice and the allowed NSSAI to the access layer logic module.

Optionally, after the access layer logic module receives the information of the first network slice sent by the non-access layer logic module, the access layer logic module is configured to determine that no cell reselection is performed before entering the connected mode, when the information of the first network slice is in the one or more network slices indicated by the allowed NSSAI and when a priority of a frequency corresponding to the first network slice of a camping cell is higher.

Optionally, after the access layer logic module receives the information of the first network slice sent by the non-access layer logic module, the access layer logic module is configured to determine to perform the cell reselection before entering the connected mode, in a case where at least one of the following is satisfied: the information of the first network slice is not in the one or more network slices indicated by the allowed NSSAI; or a priority of a frequency corresponding to the first network slice of a camping cell is lower.

Optionally, during performing the cell reselection, the terminal device is configured to select a cell with a highest priority of the frequency corresponding to the first network slice among cells supporting the first network slice to enter the connected mode.

Optionally, the determining module includes a non-access layer logic module configured to determine, based on the information of the network slice that needs to be used, whether to perform the cell reselection before entering the connected mode.

Optionally, the determining module further includes an access layer logic module. The access layer logic module is configured to, after an access layer of the terminal device selects a camping cell, send information of a network slice supported by the camping cell and priority information of a frequency corresponding to the network slice supported by the camping cell to the non-access layer logic module.

Optionally, the access layer logic module is further configured to send information of a network slice supported by a neighbour cell of a camping cell and priority information of a frequency corresponding to the network slice supported by the neighbour cell to the non-access layer logic module.

Optionally, in a case where a current service of the terminal device needs to use a second network slice, the non-access layer logic module is configured to determine whether to perform the cell reselection before entering the connected mode by determining whether the camping cell supports the second network slice and whether a frequency corresponding to the camping cell has a highest priority.

Optionally, when the camping cell does not support the second network slice, or when the camping cell supports the second network slice but the frequency corresponding to the second network slice of the camping cell does not have the highest priority, the non-access layer logic module is configured to determine that the cell reselection needs to be performed before entering the connected mode and notify the access layer logic module to perform the cell reselection.

Optionally, the non-access layer logic module is also configured to determine that no cell reselection is performed before entering the connected mode and notify the access layer logic module when the camping cell supports the second network slice and the frequency corresponding to the camping cell has the highest priority.

Optionally, the access layer logic module is further configured to determine, according to an instruction of the non-access layer logic module, to perform the cell reselection or not to perform the cell reselection before entering the connected mode.

Before entering the connected mode includes: a duration between a time after an access layer of the terminal device receives a trigger from an NAS layer and a time before the terminal device enters the connected mode; or before entering the connected mode includes: a duration between a time when the terminal device has a service requirement and a time before the terminal device enters the connected mode.

The terminal device <NUM> in the embodiments of the present disclosure can implement the corresponding functions of the device in the aforementioned method embodiments. The flow, function, implementation and beneficial effects corresponding to each module (sub-module, unit or component, etc.) in the terminal device <NUM> can be referred to the corresponding description in the above method embodiments, and will not be described repeatedly herein.

It is to be noted that, the functions described with respect to modules (sub-modules, units or components, etc.) in the terminal device <NUM> of the embodiments of the present disclosure may be implemented by different modules (sub-modules, units or components, etc.) or by the same module (sub-module, unit or component, etc.). For example, a first sending module and a second sending module may be different modules or the same module, which all can implement the corresponding functions of the terminal device according to the embodiments of the present disclosure. In addition, the transmitting module and the receiving module in the embodiments of the present disclosure can be implemented by a transceiver of the device, and some or all of the remaining modules can be implemented by the processor of the device.

<FIG> is a schematic structural diagram of a communication device <NUM> according to an embodiment of the present disclosure. The communication device <NUM> includes a processor <NUM>. The processor <NUM> may call and run computer programs from a memory to cause the communication device <NUM> to implement the method for entering the connected mode in the embodiments of the present disclosure.

Optionally, the communication device <NUM> may also include a memory <NUM>. The processor <NUM> may call and run computer programs from the memory <NUM> to implement the method for entering the connected mode in the embodiments of the present disclosure.

Optionally, the communication device <NUM> may also include a transceiver <NUM>. The processor <NUM> may control the transceiver <NUM> to communicate with other devices and specifically, may send information or data to other devices or receive information or data from other devices. The transceiver <NUM> may further include an antenna(s), and the number of the antenna(s) may be one or more.

Optionally, the communication device <NUM> may be a network device of the embodiments not being part of the present invention, and the communication device <NUM> may implement corresponding flows implemented by the network device in each method of the embodiments of the present disclosure, which will not be elaborated herein for brevity.

Optionally, the communication device <NUM> may be the terminal device in the embodiments of the present disclosure, and the communication device <NUM> may implement corresponding flows implemented by the terminal device in each method of the embodiments of the present disclosure, which will not be elaborated herein for brevity.

<FIG> is a schematic structural diagram of a chip according to an embodiment of the present disclosure. The chip <NUM> includes a processor <NUM>, and the processor <NUM> may call and run computer programs from a memory to implement the method for entering the connected mode in the embodiments of the disclosure. The processor <NUM> may include at least one processor circuit.

Optionally, the chip <NUM> may also include a memory <NUM>. The processor <NUM> may call and run the computer programs from the memory <NUM> to implement the method of entering a connected mode in embodiments of the present disclosure. The memory <NUM> may be a separate device independent of or integrated into the processor <NUM>.

Optionally, the chip <NUM> may also include an input interface <NUM>. The processor <NUM> may control the input interface <NUM> to communicate with another device or chip, and specifically to acquire information or data from the another device or chip.

Optionally, the chip <NUM> may also include an output interface <NUM>. The processor <NUM> may control the output interface <NUM> to communicate with another device or chip, and specifically to output information or data to the another device or chip.

Optionally, the chip may be applied to the network device in the embodiments of the present disclosure, and the chip may implement corresponding flows implemented by the network device in each method of the embodiments of the present disclosure, which will not be elaborated herein for brevity.

Optionally, the chip may be applied to the terminal device in the embodiments of the present disclosure in <FIG>, and the chip may implement corresponding flows implemented by the terminal device in each method of the embodiments of the present disclosure, which will not be elaborated herein for brevity.

It is to be understood that the chips mentioned in the embodiments of the present disclosure may also be referred to as system level chips, system chips, chip systems or on-chip system chips, etc..

The above processors may be general purpose processors, Digital Signal Processors (DSPSs), Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components. The general-purpose processor may be a microprocessor or any conventional processor or the like.

The memory mentioned above may be a volatile memory or a non-volatile memory or may include both the volatile memory and the non-volatile memory. The non-volatile memory may be Read-only Memory (ROM), Programmable ROM (PROM), Erasable programmable ROM (EPROM), Electrically EPROM (EEPROM) or flash memory. The volatile memory may be a Random Access Memory (RAM).

It is to be understood that the above memory is exemplary but not restrictive. For example, the memory in the embodiments of the present disclosure may also be Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synch Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), etc. That is to say, the memory in the embodiments of the present disclosure is intended to include, but is not limited to, these and any other suitable types of memory.

<FIG> is a schematic diagram of a communication system <NUM> according to an embodiment of the present disclosure. The communication system <NUM> includes a terminal device <NUM> and a network device <NUM>.

The terminal device <NUM> may be configured to implement corresponding functions implemented by the terminal device in the methods for entering the connected mode in various embodiments of the present disclosure, and the network device <NUM> may be configured to implement corresponding functions implemented by the network device in the methods of various embodiments of the present disclosure. For the sake of brevity, it will not be elaborated herein.

The foregoing embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed by a computer, all or part of the processes or functions according to the embodiments of the present disclosure are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from a computer-readable storage medium to another computer-readable storage medium. The computer instructions may be transmitted from a website site, computer, server, or data center to another website site, computer, server, or data center in a wired (such as a coaxial cable, an optical fiber, and a Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, and microwave) manner. The computer-readable storage medium may be any available medium that may be accessed by a computer or a data storage device such as a server including one or more available medium integrations and a data center. The available medium may be a magnetic medium (such as a floppy disk, a hard disk, and a magnetic tape), an optical medium (such as a Digital Versatile Disc (DVD)), a semiconductor medium (such as a Solid State Disk (SSD)), or the like.

Claim 1:
A method for entering a connected mode, performed by a terminal device, the method comprising:
before the terminal device enters the connected mode, determining (S101), by the terminal device based on information of a network slice that needs to be used, whether to perform a cell reselection before entering the connected mode,
characterized in that before entering the connected mode comprises:
a duration between a time after an access layer of the terminal device receives a trigger from an non-access stratum, NAS, layer and a time before the terminal device enters the connected mode.