Cell selection method, service method, terminal device and network side device

Abstract

The application discloses a cell selection method, a service method, a terminal device and a network side device, and belongs to the technical field of communication. The cell selection method comprises the following steps: a low-capability terminal device performs cell search in a non-connected state; and the low-capability terminal device performs target service through a first cell in the case that no cell meeting the residence condition is found and the first cell is found; wherein the first cell is a cell in which the low-capability terminal device is prohibited from accessing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of communication, and particularly relates to a cell selection method, a service method, a terminal device and a network side device. BACKGROUND

[0002] There are various types of terminals in a communication network, for example: Reduced Capability (RedCap) terminals and non-RedCap terminals, wherein the RedCap terminal is a low-cost terminal, and its capability is lower than that of the non-RedCap terminal. The RedCap terminal can be further divided into at least two types: 1rx terminals and 2rx terminals, which correspond to RedCap terminals with one receiving antenna and terminals with two receiving antennas, respectively.

[0003] In the related art, different service cells in a communication network can serve different types of terminals. When a target cell does not support a certain type of terminal, the terminal regards the target cell as a barred cell. At this time, if the terminal cannot find a non-barred (i.e., not barred) cell, the terminal cannot obtain any service, thereby affecting the communication performance of the terminal. SUMMARY

[0004] Embodiments of the present application provide a cell selection method, a service method, a terminal device and a network side device, which can solve the problem that a terminal cannot obtain any service due to the terminal not being able to find a non-barred cell, thereby affecting the communication performance of the terminal.

[0005] In a first aspect, a cell selection method is provided, and the method comprises:

[0006] The low-capability terminal device performs cell search in a non-connected state;

[0007] The low-capability terminal device performs target service through the first cell when no cell meeting the camping condition is found and the first cell is found.

[0008] The first cell is a cell that bars the low-capability terminal device from accessing.

[0009] In a second aspect, a cell selection apparatus is provided, which is applied to a low-capability terminal, and the cell selection apparatus comprises:

[0010] A first search module is configured to perform cell search in a non-connected state.

[0011] A first execution module is configured to perform target service through the first cell when no cell meeting the camping condition is found and the first cell is found.

[0012] The first cell is a cell that prohibits the low-capability terminal device from accessing.

[0013] In a third aspect, a service method is provided, and the method comprises:

[0014] A network-side device provides a target service to a low-capability terminal device through a first cell, wherein the first cell is a cell that prohibits the low-capability terminal device from accessing.

[0015] In a fourth aspect, a service apparatus is provided, and the service apparatus is applied to a network-side device, and the service apparatus comprises:

[0016] A first service module is configured to provide a target service to a low-capability terminal device through a first cell, wherein the first cell is a cell that prohibits the low-capability terminal device from accessing.

[0017] In a fifth aspect, a terminal is provided, and the terminal comprises a processor, a memory, and a program or instructions stored in the memory and executable on the processor, and the program or instructions are executed by the processor to implement the steps of the method according to the first aspect.

[0018] In a sixth aspect, a terminal device is provided, and the terminal device comprises a processor and a communication interface, wherein the communication interface is configured to perform cell search in a non-connected state, and perform a target service through a first cell when no cell meeting a camping condition is found and the first cell is found.

[0019] In a seventh aspect, a network-side device is provided, and the network-side device comprises a processor, a memory, and a program or instructions stored in the memory and executable on the processor, and the program or instructions are executed by the processor to implement the steps of the method according to the first aspect.

[0020] In an eighth aspect, a network-side device is provided, and the network-side device comprises a processor and a communication interface, wherein the communication interface is configured to provide a target service to a low-capability terminal device through a first cell, wherein the first cell is a cell that prohibits the low-capability terminal device from accessing.

[0021] In a ninth aspect, a readable storage medium is provided, and the readable storage medium stores a program or instructions, and the program or instructions are executed by a processor to implement the steps of the method according to the first aspect, or implement the steps of the method according to the third aspect.

[0022] In a tenth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface and the processor are coupled, the processor is configured to run programs or instructions, and implement the method in the first aspect or implement the method in the third aspect.

[0023] In an eleventh aspect, a computer program / program product is provided, which is stored in a non-volatile storage medium, and the program / program product is executed by at least one processor to implement the steps of the cell selection method in the first aspect or implement the steps of the service method in the third aspect.

[0024] In the embodiments of the present application, a low-capability terminal device performs cell search in a non-connected state; the low-capability terminal device performs target service through a first cell when no cell meeting the camping condition is found and the first cell is found; and the first cell is a cell that prohibits the low-capability terminal device from accessing. In this way, even if the low-capability terminal device cannot find a non-barred cell, the terminal can obtain data interaction related to the target service through the first cell. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a block diagram of a wireless communication system to which embodiments of the present application can be applied;

[0026] Figure 2 FIG. 2 is a flowchart of a cell selection method according to an embodiment of the present application;

[0027] Figure 3 FIG. 3 is a flowchart of a service method according to an embodiment of the present application;

[0028] Figure 4 FIG. 4 is a structural diagram of a cell selection device according to an embodiment of the present application;

[0029] Figure 5 FIG. 5 is a structural diagram of a service device according to an embodiment of the present application;

[0030] Figure 6 FIG. 6 is a structural diagram of a communication device according to an embodiment of the present application;

[0031] Figure 7 FIG. 7 is a structural diagram of a terminal device according to an embodiment of the present application;

[0032] Figure 8 FIG. 8 is a structural diagram of a network-side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0034] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0035] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used not only in the systems and radio technologies mentioned above, but also in other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and NR terminology is used in most of the following description; however, these technologies can also be applied to applications beyond NR systems, such as 6th Generation (6G) communication systems.

[0036] Figure 1A block diagram of a wireless communication system to which embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 can also be referred to as a terminal device or a user terminal (UE). The terminal 11 can be a terminal side device such as a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a palm computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), a wearable device, or a vehicle-mounted device (VUE), a pedestrian terminal (PUE), etc. The wearable device includes a smart watch, a bracelet, a headset, glasses, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network side device 12 can be a base station or a core network. The base station can be referred to as a node B, an evolved node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, a transmitting receiving point (TRP), or some other appropriate terminology in the art, as long as the same technical effects are achieved. The base station is not limited to a specific technical term, and it should be noted that only a base station in an NR system is taken as an example in the embodiments of the present application, but the specific type of the base station is not limited.

[0037] With the development of mobile communication technology, there are more and more types of terminals, and the types of terminals served by different network side devices can be different. For example, a low-capability terminal (RedCap UE) is introduced in R17 (3GPP Release 17). The terminal capability of the RedCap terminal is lower than the minimum terminal capability specified in the R15 NR protocol, so that the network side device under the R16 or R15 standard cannot provide any service to the RedCap terminal under the R17 standard. In other words, the RedCap terminal regards the cell under the R16 or R15 standard as a barred cell.

[0038] In this way, if none of the cells near the RedCap terminal meets the camping condition of the RedCap terminal, for example, the signal quality does not meet the requirement or is barred from access, the RedCap terminal will not be able to determine a cell that can be camped on, resulting in the RedCap terminal being unable to obtain any service.

[0039] In the embodiments of the present application, in the case where the RedCap terminal cannot find any non-barred cell, the RedCap terminal can select one or more barred cells to perform target services through the selected barred cells. That is, in the case where the RedCap terminal cannot find any non-barred cell, the RedCap terminal can still obtain limited services through the barred cells in the embodiments of the present application.

[0040] The cell selection method, service method, terminal device and network side device provided by the embodiments of the present application will be described in detail in combination with the drawings and some embodiments and application scenarios.

[0041] Please refer to Figure 2 is a flowchart of a cell selection method provided by the embodiments of the present application. The execution subject of the cell selection method can be a low-capability terminal, such as a RedCap terminal. Figure 1 As shown in the figure, the cell selection method can include the following steps:

[0042] Step 201: The low-capability terminal device performs cell search in a non-connected state.

[0043] In specific implementations, the low-capability terminal device described above can be a RedCap terminal introduced in R17, and the cell search described above can include the cell selection and reselection mechanism specified in R16, for example, if all the cells detected by a UE do not meet the camping condition (for example, the signal quality does not meet the requirement or is barred), the UE will not be able to determine a cell that can be camped on. At this time, the UE enters an any cell selection state (Any Cell Selection state). In this state, the UE cannot obtain communication services and can only perform cell selection and reselection to try to find a cell that can be camped on.

[0044] Of course, in actual applications, the low-capability terminal device and the cell search mechanism described above can also be terminal devices and cell search mechanisms defined in subsequent possible R17, R18 and the like. For ease of description, in the following embodiments, the low-capability terminal device is taken as a RedCap terminal, and the cell search mechanism is taken as the cell selection and reselection mechanism specified in R16 for example, which does not constitute a limitation.

[0045] In addition, the non-connected state can include a radio resource control (RRC) idle state or an RRC inactive state.

[0046] In step 202, the low-capability terminal device performs a target service through the first cell when no cell meeting the camping condition is found and the first cell is found. The first cell is a cell that prohibits the low-capability terminal device from accessing.

[0047] In a specific implementation, when the low-capability terminal device does not find a cell meeting the camping condition, it can be understood that all cells near the low-capability terminal device prohibit the low-capability terminal device from camping (or accessing), or the signal quality of the cell that does not prohibit the low-capability terminal device from camping does not meet the requirements of the low-capability terminal device.

[0048] Correspondingly, when the low-capability terminal device finds the first cell, it can be understood that the low-capability terminal device finds a cell that prohibits the low-capability terminal device from camping, and the signal quality of the cell meets the requirements of the low-capability terminal device.

[0049] In addition, the first cell prohibits the low-capability terminal device from accessing or camping, but the first cell can allow normal terminal devices to access or camp, for example, the first cell can be a cell whose cell barred IE in the master information block (MIB) is set to not barred. The normal terminal device can also be referred to as a non-RedCap terminal device. In actual applications, some cells in a network system can support RedCap terminal access, and some cells can not support RedCap terminal access.

[0050] In the prior art, when all the cells detected by the RedCap terminal do not meet the camping condition, the RedCap terminal cannot determine a campable cell, and at this time, the RedCap terminal cannot obtain communication services.

[0051] The difference between the embodiment of the present application and the prior art is that if all the cells detected by the RedCap terminal do not meet the camping condition, the RedCap terminal can search based on a cell selection and reselection mechanism to try to find a campable cell or a first cell, and when no cell meeting the camping condition is found and the first cell is found, the target service can still be performed through the first cell.

[0052] As an optional implementation, the target service includes at least one of the following:

[0053] an Earthquake and Tsunami Warning System (ETWS) service;

[0054] a Commercial Mobile Alert System (CMAS) service;

[0055] an emergency call service.

[0056] In a specific implementation, when a disaster or emergency occurs, a cell of a mobile communication system can broadcast ETWS and CMAS information, that is, the ETWS service and the CMAS service described above belong to a broadcast service, at this time, the RedCap terminal performs the target service through the first cell, which can be understood as that the RedCap terminal listens to the first cell to obtain the broadcast message related to the ETWS service and / or the CMAS service.

[0057] It should be noted that in the existing R15 Cell bar mechanism, the UE is not allowed to camp on a cell barred from receiving ETWS and CMAS information. At this time, for a cell in a barred state, because the cell knows that no UE will camp, it can also not send ETWS and CMAS information. Moreover, even if there are some cells around the RedCap terminal that send ETWS and CMAS information (for example, cells that do not prohibit non-RedCap camping or access), because the RedCap terminal regards the cell as a barred cell, the RedCap terminal cannot receive ETWS and CMAS information.

[0058] However, in the embodiments of the present application, for the first cell that prohibits RedCap terminals or all terminals from accessing / camping, it still broadcasts ETWS and CMAS information, and the prohibited RedCap terminal can still listen to the broadcast message of the first cell to obtain the broadcast message related to the ETWS service and / or the CMAS service.

[0059] In addition, in the case where the target service includes the emergency call service described above, the RedCap terminal performing the target service through the first cell can be understood as that the RedCap terminal carries out data transmission related to the emergency call service based on the first cell.

[0060] Of course, in actual applications, according to the needs of different services, the first cell can also provide other types of services for the RedCap terminal, which is not limited here.

[0061] As an optional implementation, the first cell comprises at least one of a first type cell and a second type cell;

[0062] The first type cell is a cell that prohibits the low capability terminal device from accessing and meets the cell selection criterion of the low capability terminal device;

[0063] The second type cell is a cell in the first type cell that meets at least one of the following conditions:

[0064] Belongs to a Public Land Mobile Network (PLMN) corresponding to the low capability terminal device;

[0065] A broadcasted Tracking Area (TA) does not belong to a TA area forbidden by the low capability terminal device.

[0066] In implementation, the second type cell can be understood as a special case of the first type cell, i.e., the second type cell is a first type cell that meets at least one of the following conditions:

[0067] Belongs to a PLMN corresponding to the low capability terminal device;

[0068] A broadcasted TA area does not belong to a TA area forbidden by the low capability terminal device.

[0069] Wherein, the PLMN corresponding to the low capability terminal device can include at least one of the following PLMNs: a Selected PLMN, a Registered PLMN, and a PLMN in an Equivalent PLMN list; in addition, the TA area forbidden by the low capability terminal device can be understood as a TA area in a list of “Forbidden Tracking Areas” of the low capability terminal device. The cell selection criterion of the low capability terminal device can be understood as meeting a cell selection criterion specified in a standard communication protocol, for example, meeting a cell selection criterion in 3GPP protocol number TS36.304 or TS38.304.

[0070] It should be noted that compared to performing the target service through other cells of the first type cell, the RedCap terminal can avoid roaming charges and the like when performing the target service through the second type cell. At this time, the RedCap terminal can preferentially select to perform the target service through the second type cell in the following manner:

[0071] In the case that the low capability terminal device does not find a cell satisfying the camping condition and finds the first type of cell, the low capability terminal device performs the target service through the first type of cell, including at least one of the following:

[0072] In the case that the low capability terminal device does not find a cell satisfying the camping condition and finds the second type of cell, the low capability terminal device performs the target service through the second type of cell.

[0073] In the case that the low capability terminal device does not find a cell satisfying the camping condition and the second type of cell, and finds the first type of cell, the low capability terminal device performs the target service through the first type of cell.

[0074] In the implementation, in the case that the low capability terminal device does not find a cell satisfying the camping condition and finds the second type of cell, the low capability terminal device can find the second type of cell and other cells in the first type of cell except the second type of cell. At this time, the low capability terminal device preferentially selects the second type of cell to perform the target service.

[0075] Correspondingly, in the case that the low capability terminal device does not find a cell satisfying the camping condition and the second type of cell, and finds the first type of cell, it can be understood that the low capability terminal device only finds other cells in the first type of cell except the second type of cell. At this time, the low capability terminal device can only perform the target service through the other cells in the first type of cell except the second type of cell.

[0076] Further, after the low capability terminal device performs the target service through the first type of cell in the case that the low capability terminal device does not find a cell satisfying the camping condition and the second type of cell, and finds the first type of cell, the method further includes:

[0077] The low capability terminal device searches for cells on all supported frequency points and all RATs.

[0078] In the case that the low capability terminal device does not find a cell satisfying the camping condition and finds the second type of cell, the low capability terminal device performs the target service through the second type of cell.

[0079] In this embodiment, the RedCap terminal can continue or periodically search for cells on all supported frequency points and all RATs after performing the target service through the first type of cell, or during the process of performing the target service through the first type of cell, so as to find a more suitable cell.

[0080] In this way, in a case where the RedCap terminal subsequently discovers a second type of cell, the target service is performed through the second type of cell.

[0081] Of course, in a case where the RedCap terminal discovers a second cell, the RedCap terminal can camp on the second cell to obtain services including the target service.

[0082] That is, the priority of the second cell can be higher than the priority of the second type of cell, and the priority of the second type of cell can be higher than the priority of the first type of cell.

[0083] In this embodiment, the RedCap terminal timely discovers or searches for a more suitable cell to timely obtain services through the more suitable cell, which can improve the service quality of the RedCap terminal.

[0084] As an optional implementation, the low-capability terminal device performs cell search in a non-connected state, including:

[0085] The low-capability terminal device searches for cells on all supported frequency points and all radio access technologies (RATs);

[0086] In a case where the low-capability terminal device does not discover a cell that meets the camping condition and discovers a first cell, the low-capability terminal device performs the target service through the first cell, including:

[0087] In a case where the low-capability terminal device does not discover a cell that meets the camping condition on all supported frequency points and all RATs and discovers a first cell, the low-capability terminal device performs the target service through the first cell.

[0088] In this embodiment, the low-capability terminal device searches for cells on all supported frequency points and all RATs in a non-connected state to attempt to find a second cell that meets the camping condition or attempt to find a first cell. In this way, if a second cell that meets the camping condition is found, the target service is performed through the second cell; if no cell that meets the camping condition is found and a first cell is found, the target service is performed through the first cell.

[0089] The above searching for cells on all supported frequency points and all RATs can include intra-frequency cell reselection.

[0090] As an optional implementation, in a case where the low-capability terminal device performs the target service through the first cell, the method further includes:

[0091] The low-capability terminal device ignores fourth indication information received from the first cell, where the fourth indication information is used to indicate whether the low-capability terminal device is allowed or not allowed to perform intra-frequency cell selection or reselection.

[0092] In a specific implementation, the fourth indication information can be an intra-Frequency Reselection flag in the MIB introduced in the R15 NR protocol. In the R15 NR protocol, the following Cell bar mechanism is introduced:

[0093] In some cases, in order to prohibit the UE from accessing or attaching to the cell, the cell can broadcast a cellbarred indication in the system information. If the UE reads the system information and finds that the cellbarred IE is set to barred, the UE will avoid selecting or reselecting to the cell in the future for a period of time (the length of time is a preset value). When the UE finds that the cellbarred IE is set to barred, it will determine whether to select or reselect to other cells on the frequency point of the cell according to the intra-Frequency Reselection flag in the MIB. The intra-Frequency Reselection defines parameters related to intra-frequency cell reselection. If the intra-Frequency Reselection IE is set to not allowed, the UE will not be allowed to select or reselect to other cells on the frequency point of the cell in the future for a period of time (the length of time is a preset value); otherwise, the UE is allowed to select or reselect to other cells on the frequency point of the cell.

[0094] In other words, in the related art, when the cellbarred IE of the cell is set to barred, the UE needs to consider only the intra-Frequency Reselection IE in the system information, and does not need to consider other IEs, and in the case where the intra-Frequency Reselection IE is set to not allowed, no intra-frequency cell selection or reselection is performed.

[0095] In the embodiments of the present application, if the RedCap terminal selects the first cell to perform target service, even if the first cell sends the fourth indication information to the RedCap terminal for indicating whether it prohibits the RedCap terminal from selecting or reselecting to other cells on the frequency point of the first cell, the RedCap terminal can ignore the fourth indication information and continue to search for cells on all supported frequency points and all RATs, so as to find a more suitable second cell, and in the case where a more suitable second cell is found, the RedCap terminal can reselect the second cell as a serving cell.

[0096] It should be noted that in addition to the above intraFreqReselection, the fourth indication information can also be newly defined indication information, which is not specifically limited here.

[0097] Optionally, in the case that the low-capability terminal device does not find a cell meeting the camping condition and finds the first cell, after performing target service through the first cell, the method further includes:

[0098] The low-capability terminal device searches for cells on all supported frequency points and all RATs;

[0099] The low-capability terminal device camps on a second cell in the case that the second cell is found not to prohibit the low-capability terminal device from camping.

[0100] The second cell does not prohibit RedCap terminals from camping, so it is more convenient for RedCap terminals to camp, and thus is more suitable for providing service for RedCap terminals than the first cell.

[0101] The second cell can include at least one of a suitable cell and an acceptable cell matched with the low-capability terminal device.

[0102] The suitable cell belongs to a PLMN corresponding to the low-capability terminal device, meets the cell selection criteria of the low-capability terminal device, and the broadcast TA area does not belong to the TA area prohibited by the low-capability terminal device.

[0103] The acceptable cell meets the cell selection criteria of the low-capability terminal device.

[0104] Specifically, the suitable cell refers to a cell in which a RedCap terminal can camp and obtain normal service. The suitable cell at least meets the following conditions:

[0105] 1) The cell belongs to at least one of the following PLMNs of the RedCap terminal:

[0106] A PLMN in a Selected PLMN, a Registered PLMN, and an Equivalent PLMN list of the UE;

[0107] 2) The cell meets the cell selection criteria, for example, the cell selection criteria in 3GPP protocol No. TS36.304 or TS38.304;

[0108] 3) The cell is not prohibited from camping;

[0109] 4) The broadcasted TA information of the cell does not belong to the list of “Forbidden Tracking Areas”.

[0110] The acceptable cell refers to a cell that the RedCap terminal can camp on and obtain limited services (initiate emergency calls, receive ETWS and CMAS messages). The acceptable cell meets the following minimum requirements for initiating emergency calls and receiving ETWS and CMAS messages:

[0111] 1) The cell is not forbidden to camp on;

[0112] 2) The cell meets the cell selection criteria, for example: the cell selection criteria in 3GPP protocol number TS36.304 or TS38.304.

[0113] In the embodiment, after the RedCap terminal performs the target service through the first cell, or in the process of the RedCap terminal listening to the broadcast message on the first cell, the RedCap terminal can continuously or periodically search for cells on all supported frequency points and all RATs, so that in the presence of the second cell, the RedCap terminal camps on the second cell and is provided with services including the target service by the second cell, so as to improve the communication performance of the RedCap terminal.

[0114] In actual application, when the RedCap terminal camps on the acceptable cell, the RedCap terminal can only obtain limited services such as initiating emergency calls, receiving ETWS and CMAS messages, and when the RedCap terminal camps on the suitable cell, the RedCap terminal can also obtain more other services in addition to the limited services, for example: video calls, etc.

[0115] Further, the RedCap terminal can be made to preferentially camp on the suitable cell, so that the RedCap terminal can obtain more comprehensive services in time:

[0116] The low-capability terminal device camps on the second cell in the case of discovering that the low-capability terminal device is not forbidden to camp on the second cell, including at least one of the following:

[0117] The low-capability terminal device camps on the suitable cell in the case of discovering the suitable cell;

[0118] The low-capability terminal device camps on the acceptable cell in the case of not discovering the suitable cell and discovering the acceptable cell.

[0119] In this embodiment, the priority of the suitable cell is higher than the priority of the acceptable cell, so that the low-capability terminal device is preferentially camped on the suitable cell to obtain more comprehensive services.

[0120] In actual application, in view of the fact that there can be some second cells supporting RedCap terminal access and some first cells not supporting RedCap terminal access in the network, the terminal device can determine whether the searched cell is the first cell or the second cell based on the indication of the network side.

[0121] As an optional embodiment, the discovery of the first cell by the low-capability terminal device comprises at least one of the following:

[0122] The low-capability terminal device receives first indication information sent by the first cell, wherein the first indication information is used to indicate that the first cell prohibits low-capability terminal access;

[0123] The low-capability terminal device does not receive second indication information sent by the first cell, wherein the second indication information is used to indicate that the first cell allows low-capability terminal access.

[0124] Correspondingly, in the case that the low-capability terminal device receives third indication information sent by the second cell, it can be determined that the low-capability terminal device discovers the second cell that does not prohibit the low-capability terminal device to camp, wherein the third indication information is used to indicate that the second cell allows low-capability terminal access.

[0125] In specific implementation, the above-mentioned first indication information, second indication information and third indication information can be information carried in broadcast messages or system information. Specifically, the above-mentioned first indication information can be understood as a prohibition indication (RedCapbar) indicating a first preset value (such as barred); correspondingly, the above-mentioned second indication information and / or third indication information can be understood as a prohibition indication (RedCapbar) indicating a second preset value (such as not barred).

[0126] In wireless communication, a RedCap bar for RedCap terminal can be introduced, so that when the RedCap bar indication is not carried in the cell broadcast message or the RedCap bar is carried in the cell broadcast message and indicates the first preset value (such as barred) of the RedCap bar, the RedCap terminal is prohibited to access the cell; otherwise, the RedCap terminal is not prohibited to access the cell.

[0127] Of course, the RedCap bar can include multiple bars to correspond to different capabilities of RedCap terminals respectively, such as a RedCap terminal with 1 receive antenna (1rx) and a RedCap terminal with 2 receive antennas (2rx) can correspond to different RedCap bars.

[0128] In this way, the same cell can indicate that a certain type of terminal is prohibited to camp or access through a specific information field in the system message or broadcast message, for example: the RedCap bar of a cell can indicate at least one of the following information:

[0129] Prohibit 1rx RedCap UE camping;

[0130] Prohibit 2rx RedCap UE camping;

[0131] Prohibit non-RedCap UE camping;

[0132] Prohibit all UE camping.

[0133] In the embodiment of the present application, the low-capability terminal device performs cell search in the non-connected state; if the low-capability terminal device does not find a cell that meets the camping condition and finds a first cell, the low-capability terminal device performs target service through the first cell; wherein the first cell is a cell that prohibits the low-capability terminal device from accessing. In this way, even if the low-capability terminal device cannot find a non-barred cell, the terminal can obtain data interaction related to the target service through the first cell.

[0134] Please refer to Figure 3 is a flowchart of a service method provided by the embodiment of the present application, and the execution subject of the service method can be a network side device, such as Figure 3 As shown in the figure, the service method can include the following steps:

[0135] Step 301, the network side device provides target service to the low-capability terminal device through a first cell, wherein the first cell is a cell that prohibits the low-capability terminal device from accessing.

[0136] In a specific implementation, the first cell has the same meaning as the first cell in the method embodiment as shown in Figure 2 , and the first cell can not prohibit the normal terminal device from accessing or prohibit the normal terminal device from accessing, which will not be described here.

[0137] In the case that the first cell prohibits all terminal devices from accessing, the first cell can still broadcast ETWS service and CMAS service messages. In addition, whether the first cell prohibits all terminal devices from accessing or only prohibits low-capability terminal devices from accessing, the first cell can still provide emergency call services to low-capability terminal devices.

[0138] In addition, the low-capability terminal device has the same meaning as the RedCap terminal in the method embodiment as shown in Figure 2 The RedCap terminal in the method embodiment as shown in has the same meaning, and will not be repeated here.

[0139] Optionally, the first cell includes at least one of a first type of cell and a second type of cell.

[0140] The first type of cell is a cell that prohibits the low-capability terminal device from accessing and meets the cell selection criteria of the low-capability terminal device.

[0141] The second type of cell is a cell in the first type of cell that meets at least one of the following conditions:

[0142] Belongs to the PLMN corresponding to the low-capability terminal device.

[0143] The broadcast TA area does not belong to the TA area prohibited by the low-capability terminal device.

[0144] In specific implementations, the first type of cell and the second type of cell have the same meaning as the first type of cell and the second type of cell in the method embodiment as shown in Figure 2

[0145] Corresponding to the method embodiment as shown in Figure 2 In the case that the first cell includes the first type of cell and the second type of cell, the network side device can preferentially provide target services to the low-capability terminal device through the second type of cell.

[0146] In actual applications, the RedCap terminal can report the detection result related to the RRM measurement relaxation criterion (for example: mobility, located in which cell non-edge area) to the network side device, at this time, the network side device can determine which cells meet the conditions of the first type of cell or the second type of cell of the RedCap terminal, and preferentially provide target services to the RedCap terminal through the second type of cell.

[0147] ​Of course, the network side device can directly issue the RRC measurement relaxation criterion to the RedCap terminal, and the RedCap terminal can autonomously measure the mobility, whether it is located at the cell edge and other parameters, and determine which cells meet the conditions of the first type of cell or the second type of cell according to the measurement results, and report the determination result to the network side device. The network side device determines to preferentially provide the target service to the RedCap terminal through the second type of cell according to the determination result.

[0148] Optionally, before the network side device provides the target service to the low-capability terminal device through the first cell, the method further comprises:

[0149] The network side device sends first indication information to the low-capability terminal device, wherein the first indication information is used to indicate that the first cell prohibits low-capability terminal access.

[0150] In specific implementation, the first indication information has the same meaning and effect as the first indication information in the method embodiment as shown in Figure 2 The first indication information can also be carried in a broadcast message or a system message, which will not be described here.

[0151] Optionally, the target service includes at least one of the following:

[0152] ETWS service;

[0153] CMAS service;

[0154] Emergency call service.

[0155] In specific implementation, the first cell can broadcast ETWS and CMAS service messages, and the RedCap terminal can listen to the broadcast messages of the first cell to obtain the ETWS and CMAS service messages. Alternatively, when the RedCap terminal needs to initiate an emergency call, it can initiate an emergency call using the first cell.

[0156] It should be noted that, unlike the prior art, the first cell can still broadcast ETWS and CMAS service messages when it prohibits all cell access or camping.

[0157] Optionally, after the network side device provides the target service to the low-capability terminal device through the first cell, the method further comprises:

[0158] The network side device provides service to the low-capability terminal device through the second cell when it is determined that there is a second cell that does not prohibit the low-capability terminal device from camping.

[0159] In specific implementation, the second cell has the same meaning and effect as the second cell in the method embodiment as shown in Figure 2The second cell in the method embodiment has the same meaning, and compared with the first cell, the network side device preferentially provides service to the RedCap terminal through the second cell, which will not be repeated here.

[0160] Optionally, the second cell includes a suitable cell and / or an acceptable cell matched with the low-capability terminal device.

[0161] The suitable cell belongs to the PLMN corresponding to the low-capability terminal device, meets the cell selection criteria of the low-capability terminal device, and the broadcast TA area does not belong to the TA area prohibited by the low-capability terminal device.

[0162] The acceptable cell meets the cell selection criteria of the low-capability terminal device.

[0163] In specific implementation, the above-mentioned suitable cell and acceptable cell respectively correspond to the suitable cell and acceptable cell as described in the method embodiment. Figure 2 The suitable cell and acceptable cell in the method embodiment have the same meaning, and compared with the acceptable cell, the network side device can preferentially provide service to the RedCap terminal through the suitable cell, which will not be repeated here.

[0164] Optionally, before the network side device provides service to the low-capability terminal device through the second cell in the case that it is determined that there is a second cell in which the low-capability terminal device is not prohibited to camp on, the method further includes:

[0165] The network side device sends third indication information to the low-capability terminal device, wherein the third indication information is used to indicate that the second cell allows low-capability terminal access.

[0166] In specific implementation, the above-mentioned third indication information has the same meaning and effect as the third indication information as described in the method embodiment. Figure 2 The third indication information in the method embodiment has the same meaning and effect, which will not be repeated here.

[0167] Optionally, before the network side device provides target service to the low-capability terminal device through the first cell, the method further includes:

[0168] The network side device sends fourth indication information to the low-capability terminal device, wherein the fourth indication information is used to indicate whether the low-capability terminal device is allowed to perform intra-frequency cell selection or reselection.

[0169] In specific implementation, the above-mentioned fourth indication information has the same meaning and effect as the fourth indication information as described in the method embodiment. Figure 2The fourth indication information in the method embodiment has the same meaning and role, and when the network side device sends the fourth indication information to the RedCap terminal, the RedCap terminal can ignore the fourth indication information, so that the RedCap terminal can still perform intra-frequency cell reselection when performing target service through the first cell, so as to find a more suitable serving cell, and details are not repeated here.

[0170] The service method provided by the embodiments of the present application corresponds to the cell selection method as shown in Figure 2 , and can achieve similar beneficial effects. To avoid repetition, details are not repeated here.

[0171] In order to facilitate understanding of the cell selection method and the service method provided by the embodiments of the present application, the cell selection method and the service method provided by the embodiments of the present application are exemplified below by taking four specific embodiments as examples:

[0172] Embodiment 1

[0173] Step 1, the IDLE UE performs cell selection or reselection, and cannot detect any suitable and acceptable cell;

[0174] Step 2, the IDLE UE detects N first cells (including first type cells and second type cells);

[0175] Step 3, the UE selects a second type cell to listen to the EWTS and CMAS messages on the second type cell, and / or initiates an emergency call.

[0176] In the embodiment, the IDLE UE represents a RedCap terminal in an idle state.

[0177] It should be noted that in the case where the UE selects a second type cell to listen to the EWTS and CMAS messages on the second type cell, and / or initiates an emergency call, the UE can ignore the intra-frequency reselection indication broadcast by the selected first cell (i.e. consider that intra-frequency reselection is allowed), or the UE can ignore the intra-frequency reselection indication broadcast by all first type cells and / or second type cells, i.e. the fourth indication information in the method embodiment as shown in Figure 2 , details are not repeated here.

[0178] Embodiment 2

[0179] Step 1, the IDLE UE performs cell selection or reselection, and cannot detect any suitable and acceptable cell;

[0180] Step 2, the IDLE UE detects N first cells (only including one of the first type cells and the second type cells);

[0181] Step 3, the UE selects a detected first type cell or second type cell to listen to the EWTS and CMAS messages on the first type cell or second type cell and / or initiate an emergency call.

[0182] In this embodiment, the UE can also ignore the intra-frequency reselection indication broadcast by the first cell providing the target service, or the UE can ignore the intra-frequency reselection indication broadcast by all first type cells and / or second type cells, which will not be described herein again.

[0183] Embodiment 3

[0184] After the UE performs the target service through any first type cell or after performing the target service, the UE performs a search for cells on all supported frequency points and RATs, and once a suitable cell is found, selects the corresponding suitable cell for camping; or the UE performs a search for cells on all supported frequency points and RATs, and once an acceptable cell is found, selects the corresponding acceptable cell for camping in the absence of a suitable cell.

[0185] In this embodiment, the UE can also ignore the intra-frequency reselection prohibition indication broadcast by the camping cell, or the UE can ignore the intra-frequency reselection prohibition indication broadcast by all first type cells and / or second type cells, which will not be described herein again.

[0186] Embodiment 4

[0187] After the UE performs the target service through a first type cell or after performing the target service, the UE performs a search for cells on all supported frequency points and RATs, and once a second type cell is found, selects the corresponding second type cell to perform the target service through the second type cell in the absence of a suitable and acceptable cell.

[0188] In this embodiment, the UE preferentially selects a second type cell in the first cell to perform the target service through the second type cell.

[0189] It should be noted that the cell selection method provided in the embodiments of the present application can be executed by a cell selection device or a control module in the cell selection device for executing the cell selection method. In the embodiments of the present application, the cell selection device executing the cell selection method is taken as an example to describe the cell selection device provided in the embodiments of the present application.

[0190] Please refer to Figure 4 The cell selection device 400 provided in the embodiments of the present application is applied to a low-capability terminal, such as Figure 4As shown, the cell selection apparatus 400 comprises:

[0191] a first searching module 401, configured to perform cell searching in a non-connected state;

[0192] a first performing module 402, configured to perform a target service through the first cell in a case where no cell meeting a camping condition is found and the first cell is found.

[0193] The first cell is a cell that prohibits access of the low-capability terminal device.

[0194] Optionally, the first cell does not prohibit access of a normal terminal device.

[0195] Optionally, the first cell comprises at least one of a first type of cell and a second type of cell.

[0196] The first type of cell is a cell that prohibits access of the low-capability terminal device and meets a cell selection criterion of the low-capability terminal device.

[0197] The second type of cell is a cell that meets at least one of the following conditions in the first type of cell:

[0198] belongs to a PLMN corresponding to the low-capability terminal device;

[0199] a broadcast TA area does not belong to a TA area prohibited by the low-capability terminal device.

[0200] Optionally, the first performing module 402 is configured to perform at least one of the following:

[0201] perform the target service through the second type of cell in a case where no cell meeting the camping condition is found and the second type of cell is found;

[0202] perform the target service through the first type of cell in a case where no cell meeting the camping condition and the second type of cell is found and the first type of cell is found.

[0203] Optionally, the cell selection apparatus 400 further comprises:

[0204] a third searching module, configured to search for cells on all supported frequency points and all RATs;

[0205] a second performing module, configured to perform the target service through the second type of cell in a case where no cell meeting the camping condition is found and the second type of cell is found.

[0206] Optionally, the low-capability terminal device finding the first cell comprises at least one of the following:

[0207] The low-capability terminal device receives first indication information sent by the first cell, where the first indication information is used to indicate that the first cell prohibits low-capability terminal access;

[0208] The low-capability terminal device does not receive second indication information sent by the first cell, where the second indication information is used to indicate that the first cell allows low-capability terminal access.

[0209] Optionally, the target service includes at least one of the following:

[0210] ETWS service;

[0211] CMAS service;

[0212] Emergency call service.

[0213] Optionally, the first search module 401 is specifically configured to:

[0214] search for cells on all supported frequency points and all RATs;

[0215] The first execution module is specifically configured to:

[0216] in the case where it is found that none of the cells on all supported frequency points and all RATs meets the camping condition and the first cell is found, perform the target service through the first cell.

[0217] Optionally, the cell selection apparatus 400 further includes:

[0218] an ignoring module configured to ignore fourth indication information received from the first cell, where the fourth indication information is used to indicate whether the low-capability terminal device is allowed or not allowed to perform intra-frequency cell selection or reselection.

[0219] Optionally, the cell selection apparatus 400 further includes:

[0220] a second search module configured to search for cells on all supported frequency points and all RATs;

[0221] a camping module configured to camp on a second cell that does not prohibit the low-capability terminal device to camp in the case where it is found.

[0222] Optionally, the second cell includes a suitable cell and / or an acceptable cell that matches the low-capability terminal device;

[0223] wherein the suitable cell belongs to a PLMN corresponding to the low-capability terminal device, meets the cell selection criterion of the low-capability terminal device, and the broadcast TA area does not belong to the TA area prohibited by the low-capability terminal device.

[0224] The acceptable cell meets cell selection criteria of the low-capability terminal device.

[0225] Optionally, the camping module is specifically configured to perform at least one of the following:

[0226] camping on the suitable cell when the suitable cell is found;

[0227] camping on the acceptable cell when the suitable cell is not found and the acceptable cell is found.

[0228] Optionally, the low-capability terminal device discovers a second cell in which the low-capability terminal device is not prohibited from camping, including:

[0229] the low-capability terminal device receives third indication information sent by the second cell, where the third indication information is used to indicate that the second cell allows low-capability terminal access.

[0230] The cell selection apparatus provided in the embodiments of the present application can perform each process in the method embodiments as shown in Figure 2 The same beneficial effects can be achieved, and thus details are not repeated here.

[0231] The cell selection apparatus in the embodiments of the present application can be an apparatus, an apparatus with an operating system, or an electronic device, and can also be a component in a terminal, an integrated circuit, or a chip. The apparatus or the electronic device can be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal can include, but is not limited to, the types of the terminal 11 listed above, and the non-mobile terminal can be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a cashier machine, or a self-service machine, etc., and the embodiments of the present application are not limited in this regard.

[0232] It should be noted that the service method provided in the embodiments of the present application can be executed by a service apparatus, or a control module in the service apparatus for executing the service method. In the embodiments of the present application, the service apparatus executes the service method is taken as an example to illustrate the service apparatus provided in the embodiments of the present application.

[0233] Referring to Figure 5 , the service apparatus 500 provided in the embodiments of the present application is applied to a network side device, as shown in Figure 5 , the service apparatus 500 includes:

[0234] The first service module 501 is configured to provide target service for the low capability terminal device through the first cell, wherein the first cell is a cell that prohibits the low capability terminal device from accessing.

[0235] Optionally, the first cell does not prohibit the normal terminal device from accessing.

[0236] Optionally, the first cell includes at least one of a first type of cell and a second type of cell.

[0237] The first type of cell is a cell that prohibits the low capability terminal device from accessing and meets the cell selection criterion of the low capability terminal device.

[0238] The second type of cell is a cell in the first type of cell that meets at least one of the following conditions:

[0239] Belongs to a PLMN corresponding to the low capability terminal device.

[0240] The broadcast TA area does not belong to a TA area prohibited by the low capability terminal device.

[0241] Optionally, in the case where the first cell includes the first type of cell and the second type of cell, the first service module 501 is specifically configured to:

[0242] Preferentially provide target service for the low capability terminal device through the second type of cell.

[0243] Optionally, the service apparatus 500 further includes:

[0244] The first sending module is configured to send first indication information to the low capability terminal device, wherein the first indication information is used to indicate that the first cell prohibits low capability terminal devices from accessing.

[0245] Optionally, the target service includes at least one of the following:

[0246] ETWS service;

[0247] CMAS service;

[0248] Emergency call service.

[0249] Optionally, the service apparatus 500 further includes:

[0250] The second service module is configured to provide service for the low capability terminal device through a second cell in a case where it is determined that there is a second cell that does not prohibit the low capability terminal device from camping.

[0251] Optionally, the second cell includes a suitable cell and / or an acceptable cell that matches the low capability terminal device.

[0252] The suitable cell belongs to a PLMN corresponding to the low-capability terminal device, meets the cell selection criterion of the low-capability terminal device, and a broadcast TA area does not belong to a TA area forbidden by the low-capability terminal device.

[0253] The acceptable cell meets the cell selection criterion of the low-capability terminal device.

[0254] Optionally, when the network-side device determines that there is a second cell in which the low-capability terminal device is not barred from camping, the service apparatus 500 further includes:

[0255] A second sending module, configured to send third indication information to the low-capability terminal device, wherein the third indication information is used to indicate that the second cell allows low-capability terminal access.

[0256] Optionally, the service apparatus 500 further includes:

[0257] A third sending module, configured to send fourth indication information to the low-capability terminal device, wherein the fourth indication information is used to indicate whether the low-capability terminal device is allowed to perform inter-frequency cell selection or reselection.

[0258] The service apparatus provided in the embodiments of the present application can perform each process in the method embodiments as shown in Figure 3 , and can achieve the same beneficial effects. To avoid repetition, details are not described herein.

[0259] Optionally, as shown in Figure 6 , the embodiments of the present application further provide a communication device 600, which includes a processor 601, a memory 602, a program or instruction stored in the memory 602 and executable on the processor 601. For example, when the communication device 600 is a terminal, the program or instruction is executed by the processor 601 to implement each process of the cell selection method embodiments as shown in Figure 2 , and can achieve the same technical effects. When the communication device 600 is a network-side device, the program or instruction is executed by the processor 601 to implement each process of the service method embodiments as shown in Figure 3 , and can achieve the same technical effects. To avoid repetition, details are not described herein.

[0260] The terminal device provided in the embodiments of the present application also includes a processor and a communication interface. The communication interface is configured to perform cell search in a non-connected state; and perform target service through a first cell in a case where no cell meeting the camping condition is found and the first cell is found, wherein the first cell is a cell that prohibits access of the low-capability terminal device. The terminal device can be a low-capability terminal device, and the terminal device embodiments correspond to the method embodiments of the low-capability terminal device described above. Each implementation process and implementation manner of the method embodiments described above can be applied to the terminal device embodiments, and the same technical effects can be achieved. Specifically, Figure 7 A hardware structure diagram of a terminal device according to an embodiment of the present application is shown in FIG. 7.

[0261] The terminal device 700 is specifically a low-capability terminal device, and the terminal device 700 includes, but is not limited to, at least part of components such as a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, and a processor 710.

[0262] Those skilled in the art can understand that the terminal device 700 can also include a power supply (such as a battery) for supplying power to each component. The power supply can be logically connected to the processor 710 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. Figure 7 The terminal device structure shown in FIG. 7 does not constitute a limitation on the terminal device. The terminal device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components, which will not be described here.

[0263] It should be understood that in the embodiments of the present application, the input unit 704 can include a graphics processing unit (GPU) 7041 and a microphone 7042. The graphics processing unit 7041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 706 can include a display panel 7061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 707 includes a touch panel 7071 and other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 can include a touch detection device and a touch controller. The other input devices 7072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), a trackball, a mouse, a joystick, etc., which will not be described here.

[0264] In the embodiments of the present application, the radio frequency unit 701 receives the downlink data from the network side device, and then sends the data to the processor 710 for processing. In addition, the radio frequency unit 701 sends the uplink data to the network side device. Generally, the radio frequency unit 701 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

[0265] The memory 709 can be used to store software programs or instructions and various data. The memory 709 can mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area can store an operating system, application programs or instructions required by at least one function (such as a sound playing function, an image playing function, and the like), and the like. In addition, the memory 709 can include a high-speed random access memory, and can also include a non-volatile memory, which can be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically erasable programmable read-only memory (Electrically EPROM, EEPROM), or a flash memory. For example, at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device.

[0266] The processor 710 can include one or more processing units; optionally, the processor 710 can integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs or instructions, and the modem processor mainly processes wireless communication, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 710.

[0267] The radio frequency unit 701 is configured to perform cell search in a case where the low-capability terminal device is in an unconnected state.

[0268] The radio frequency unit 701 is further configured to perform target service through the first cell in a case where no cell meeting the camping condition is found and the first cell is found; wherein the first cell is a cell that prohibits access of the low-capability terminal device.

[0269] Optionally, the first cell does not prohibit access of a normal terminal device.

[0270] Optionally, the first cell includes at least one of a first type of cell and a second type of cell.

[0271] The first type of cell is a cell that prohibits access of the low-capability terminal device and meets the cell selection criteria of the low-capability terminal device.

[0272] The second type of cell is a cell in the first type of cell that satisfies at least one of the following conditions:

[0273] belongs to a PLMN corresponding to the low-capability terminal device;

[0274] broadcasts a TA area that does not belong to a TA area forbidden by the low-capability terminal device.

[0275] Optionally, the radio frequency unit 701 performs the following at least one of the following in the case where no cell satisfying the camping condition is found and the first cell is found:

[0276] performing the target service through the second type of cell in the case where no cell satisfying the camping condition is found and the second type of cell is found;

[0277] performing the target service through the first type of cell in the case where no cell satisfying the camping condition and the second type of cell is found and the first type of cell is found.

[0278] Optionally, after the radio frequency unit 701 performs the target service through the first type of cell in the case where no cell satisfying the camping condition and the second type of cell is found and the first type of cell is found, the radio frequency unit 701 further performs the following:

[0279] searching for cells on all supported frequency points and all RATs;

[0280] performing the target service through the second type of cell in the case where no cell satisfying the camping condition is found and the second type of cell is found.

[0281] Optionally, the radio frequency unit 701 finds the first cell by performing the following at least one of the following:

[0282] receiving first indication information sent by the first cell, wherein the first indication information is used to indicate that the first cell forbids low-capability terminal access;

[0283] not receiving second indication information sent by the first cell, wherein the second indication information is used to indicate that the first cell allows low-capability terminal access.

[0284] Optionally, the target service includes the following at least one of the following:

[0285] ETWS service;

[0286] CMAS service;

[0287] emergency call service.

[0288] Optionally, the radio frequency unit 701 performs the cell search in the case that the low capability terminal device is in the non-connected state, including:

[0289] searching all supported frequency points and all RATs;

[0290] In the case that the radio frequency unit 701 does not find a cell satisfying the camping condition and finds a first cell, the radio frequency unit 701 performs target service through the first cell, including:

[0291] In the case that the radio frequency unit 701 does not find a cell satisfying the camping condition and finds a first cell, the radio frequency unit 701 performs target service through the first cell.

[0292] Optionally, in the case that the radio frequency unit 701 performs target service through the first cell, the radio frequency unit 701 further ignores fourth indication information received from the first cell, wherein the fourth indication information is used to indicate whether the low capability terminal device is allowed to perform intra-frequency cell selection or reselection.

[0293] Optionally, after the radio frequency unit 701 performs target service through the first cell in the case that the radio frequency unit 701 does not find a cell satisfying the camping condition and finds a first cell, the radio frequency unit 701 further:

[0294] searches all supported frequency points and all RATs;

[0295] In the case that a second cell in which the low capability terminal device is not prohibited to camp is found, the radio frequency unit 701 camps on the second cell.

[0296] Optionally, the second cell includes a suitable cell and / or an acceptable cell matched with the low capability terminal device;

[0297] The suitable cell belongs to a PLMN corresponding to the low capability terminal device, satisfies a cell selection criterion of the low capability terminal device, and a broadcasted TA area does not belong to a TA area prohibited by the low capability terminal device.

[0298] The acceptable cell satisfies the cell selection criterion of the low capability terminal device.

[0299] Optionally, the radio frequency unit 701 performs, in the case that a second cell in which the low capability terminal device is not prohibited to camp is found, camping on the second cell, including at least one of the following:

[0300] In the case that the suitable cell is found, camping on the suitable cell;

[0301] In a case where the suitable cell is not found and the acceptable cell is found, camp on the acceptable cell.

[0302] Optionally, the radio frequency unit 701 performs the discovering of the second cell in which the low-capability terminal device is allowed to camp.

[0303] The radio frequency unit 701 receives third indication information sent by the second cell, where the third indication information is used to indicate that the second cell allows low-capability terminals to access.

[0304] The terminal device 700 provided by the embodiments of the present application can implement the processes performed by the low-capability terminal device in the method embodiments as shown in Figure 2 The processes performed by the low-capability terminal device in the method embodiments as shown in

[0305] The embodiments of the present application further provide a network side device, which comprises a processor and a communication interface, and the communication interface is used to provide target services for a low-capability terminal device through a first cell, where the first cell is a cell in which the low-capability terminal device is prohibited to access. The network side device embodiment is corresponding to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment and can achieve the same technical effects.

[0306] Specifically, the embodiments of the present application further provide a network side device. As shown in Figure 8 The network device 800 comprises an antenna 801, a radio frequency device 802, and a baseband device 803. The antenna 801 is connected with the radio frequency device 802. In the uplink direction, the radio frequency device 802 receives information through the antenna 801 and sends the received information to the baseband device 803 for processing. In the downlink direction, the baseband device 803 processes the information to be sent and sends the processed information to the radio frequency device 802, and the radio frequency device 802 processes the received information and sends the processed information out through the antenna 801.

[0307] The above frequency band processing device can be located in the baseband device 803, and the method performed by the network side device in the above embodiments can be implemented in the baseband device 803. The baseband device 803 comprises a processor 804 and a memory 805.

[0308] The baseband device 803 can comprise at least one baseband board, and a plurality of chips are arranged on the baseband board, as shown in Figure 8 One of the chips is, for example, the processor 804, which is connected with the memory 805 to call the program in the memory 805 and perform the network device operation shown in the above method embodiments.

[0309] The baseband device 803 can further include a network interface 806 for interacting with the radio frequency device 802, which is, for example, a common public radio interface (CPRI).

[0310] Specifically, the network side device of the embodiment of the present application further includes instructions or programs stored in the memory 805 and executable on the processor 804, and the processor 804 invokes the instructions or programs in the memory 805 to execute the methods performed by the modules in the service device shown and achieve the same technical effects. To avoid repetition, the details are not described here. Figure 5 The modules in the service device shown perform the methods and achieve the same technical effects. To avoid repetition, the details are not described here.

[0311] The embodiment of the present application further provides a readable storage medium, and the readable storage medium stores programs or instructions, and the programs or instructions are executed by a processor to implement the methods as shown in the above embodiments. Figure 2 Or Figure 3 The modules in the service device shown perform the methods and achieve the same technical effects. To avoid repetition, the details are not described here.

[0312] The processor is the processor in the terminal described in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, etc.

[0313] The embodiment of the present application further provides a chip, and the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run programs or instructions to implement the methods as shown in the above embodiments. Figure 2 Or Figure 3 The modules in the service device shown perform the methods and achieve the same technical effects. To avoid repetition, the details are not described here.

[0314] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0315] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or with intervening action that are carried out at the same time, in any order, or in an overlapping manner. For example, the described method can be performed in a different order or simultaneously, and the various steps can be combined or omitted, or additional steps can be added, without departing from the scope of the described method. Also, features described with respect to certain examples can be combined in other examples.

[0316] From the above description of the embodiments, it is apparent that the above-described method can be implemented by software and necessary universal hardware platform, of course, it can also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present application can be embodied in the form of computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) execute the method described in various embodiments of the present application.

[0317] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-described specific embodiments, which are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A cell selection method, characterized by, Comprising: The low-capability terminal device performs cell search in a non-connected state; In a case where all detected cells prohibit the low-capability terminal device from camping or the signal quality of a detected cell that does not prohibit the low-capability terminal device from camping does not meet the requirements of the low-capability terminal device, and a first cell is found, the low-capability terminal device performs a target service through the first cell, the target service including at least one of the following: a broadcast service, an emergency call service; The first cell is a cell that prohibits the low-capability terminal device from accessing; The first cell does not prohibit normal terminal devices from accessing; The low-capability terminal device finds a first cell, comprising: The low-capability terminal device receives first indication information sent by the first cell, wherein the first indication information is used to indicate that the first cell prohibits low-capability terminal devices from accessing; The first indication information used to indicate that the first cell prohibits low-capability terminal devices from accessing includes at least one of the following: The first indication information is used to indicate that 1rx RedCap UE is prohibited from camping; The first indication information is used to indicate that 2rx RedCap UE is prohibited from camping.

2. The cell selection method of claim 1, wherein, The first cell is a cell that meets the cell selection criteria of the low-capability terminal device.

3. The cell selection method according to claim 1 or 2, characterized by, The first cell includes at least one of a first type of cell and a second type of cell; The first type of cell is a cell that prohibits the low-capability terminal device from accessing and meets the cell selection criteria of the low-capability terminal device; The second type of cell is a cell in the first type of cell that meets at least one of the following conditions: Belongs to a public land mobile network (PLMN) corresponding to the low-capability terminal device; The broadcast tracking area (TA) does not belong to the TA area prohibited by the low-capability terminal device.

4. The cell selection method of claim 3, wherein, In a case where all detected cells prohibit the low-capability terminal device from camping or the signal quality of a detected cell that does not prohibit the low-capability terminal device from camping does not meet the requirements of the low-capability terminal device, and a first cell is found, the low-capability terminal device performs a target service through the first cell, including at least one of the following: The low-capability terminal device performs a target service through the second type of cell in a case where all detected cells prohibit the low-capability terminal device from camping and the second type of cell is found; The low-capability terminal device performs a target service through the first type of cell in a case where all detected cells prohibit the low-capability terminal device from camping or the signal quality of a detected cell that does not prohibit the low-capability terminal device from camping does not meet the requirements of the low-capability terminal device, the second type of cell is not found, and the first type of cell is found.

5. The cell selection method of claim 4, wherein, In a case that all the detected cells prohibit the low capability terminal device from camping or the signal quality of the detected cell which does not prohibit the low capability terminal device from camping does not meet the requirement of the low capability terminal device, and the second type of cell is not found, and the first type of cell is found, the method further comprises: The low capability terminal device searches for cells on all supported frequency points and all radio access technologies (RATs). In a case that all the detected cells prohibit the low capability terminal device from camping or the signal quality of the detected cell which does not prohibit the low capability terminal device from camping does not meet the requirement of the low capability terminal device, and the second type of cell is found, the low capability terminal device performs the target service through the second type of cell.

6. The cell selection method according to claim 1 or 2, characterized by, The low capability terminal device finds a first cell, and the method further comprises: The low capability terminal device does not receive second indication information sent by the first cell, wherein the second indication information is used to indicate that the first cell allows low capability terminals to access.

7. The cell selection method according to claim 1 or 2, characterized by, The broadcast service comprises at least one of: Earthquake and tsunami warning system (ETWS) service; Commercial mobile alert system (CMAS) service.

8. The cell selection method according to claim 1 or 2, characterized by, In a case that the low capability terminal device is in an idle state, the low capability terminal device performs cell search, and the method comprises: The low capability terminal device searches for cells on all supported frequency points and all radio access technologies (RATs). In a case that all the detected cells prohibit the low capability terminal device from camping or the signal quality of the detected cell which does not prohibit the low capability terminal device from camping does not meet the requirement of the low capability terminal device, and the first type of cell is found, the low capability terminal device performs the target service through the first type of cell, and the method comprises: In a case that all the detected cells prohibit the low capability terminal device from camping or the signal quality of the detected cell which does not prohibit the low capability terminal device from camping does not meet the requirement of the low capability terminal device, and the first type of cell is found, the low capability terminal device performs the target service through the first type of cell.

9. The cell selection method according to claim 1 or 2, characterized by, In a case that the low capability terminal device performs the target service through the first type of cell, the method further comprises: The low capability terminal device ignores fourth indication information received from the first type of cell, wherein the fourth indication information is used to indicate whether the low capability terminal device is allowed to perform intra-frequency cell selection or reselection.

10. The cell selection method according to claim 1 or 2, characterized by, In a case that all the detected cells prohibit the low capability terminal device from camping or the signal quality of the detected cell which does not prohibit the low capability terminal device from camping does not meet the requirement of the low capability terminal device, and the first type of cell is found, the method further comprises: The low capability terminal device searches for cells on all supported frequency points and all radio access technologies (RATs). In a case that the low capability terminal device finds a second cell which does not prohibit the low capability terminal device from camping, the low capability terminal device camps on the second cell.

11. The cell selection method of claim 10, wherein, The second cell includes a suitable cell and / or an acceptable cell matched with the low-capability terminal device; The suitable cell belongs to a PLMN corresponding to the low-capability terminal device, meets the cell selection criterion of the low-capability terminal device, and a broadcast TA area does not belong to a TA area forbidden by the low-capability terminal device. The acceptable cell meets the cell selection criterion of the low-capability terminal device.

12. The cell selection method of claim 11, wherein, The low-capability terminal device camps on a second cell in a case where it is found that the second cell does not forbid the low-capability terminal device to camp, including at least one of the following: The low-capability terminal device camps on the suitable cell in a case where the suitable cell is found. The low-capability terminal device camps on the acceptable cell in a case where the suitable cell is not found and the acceptable cell is found.

13. The cell selection method of claim 10, wherein, The low-capability terminal device finds a second cell that does not forbid the low-capability terminal device to camp, including: The low-capability terminal device receives third indication information sent by the second cell, where the third indication information is used to indicate that the second cell allows low-capability terminals to access.

14. The method of claim 1 or 2, wherein, The cell search includes cell selection and cell reselection.

15. The method of claim 1 or 2, wherein, The first cell does not forbid normal terminal devices to access, including that a cell forbidden indication in a master information block (MIB) of the first cell is set to non-forbidden.

16. The method of claim 1 or 2, wherein, The low-capability terminal includes at least one of the following: a 1rx RedCap UE and a 2rx RedCap UE.

17. A cell selection apparatus, characterized by comprising: The cell selection device applied to a low-capability terminal includes: A first search module configured to perform cell search in a non-connected state; A first execution module configured to perform a target service through a first cell in a case where all detected cells forbid the low-capability terminal device to camp or signal quality of a detected cell that does not forbid the low-capability terminal device to camp does not meet a requirement of the low-capability terminal device, and the first cell is found, where the target service includes at least one of the following: a broadcast service and an emergency call service. The first cell is a cell that forbids the low-capability terminal device to access, and the first cell does not forbid normal terminal devices to access. The low-capability terminal device finds the first cell, including: The low-capability terminal device receives first indication information sent by the first cell, where the first indication information is used to indicate that the first cell forbids low-capability terminals to access. The first indication information used to indicate that the first cell forbids low-capability terminals to access includes at least one of the following: The first indication information is used to indicate that 1rx RedCap UEs are forbidden to camp. The first indication information is used to indicate that 2rx RedCap UEs are forbidden to camp.

18. The cell selection apparatus of claim 17, wherein, The first cell includes at least one of the following: a first type of cell and a second type of cell. The first type of cell is a cell that forbids the low-capability terminal device to access and meets a cell selection criterion of the low-capability terminal device. The second type of cell is a cell that meets at least one of the following conditions in the first type of cell: The public land mobile network (PLMN) corresponding to the low capability terminal device; The tracking area (TA) of the broadcast does not belong to the TA area forbidden by the low capability terminal device.

19. The cell selection apparatus of claim 18, wherein, The first execution module is configured to execute at least one of the following: In a case where all the detected cells forbid the low capability terminal device to camp on and the second type of cell is found, the target service is executed through the second type of cell; In a case where all the detected cells forbid the low capability terminal device to camp on or the signal quality of the detected cell that does not forbid the low capability terminal device to camp on does not meet the requirement of the low capability terminal device and the first type of cell is found, the target service is executed through the first type of cell.

20. The cell selection apparatus of claim 17, wherein, Further comprising: The second search module is configured to search for cells on all supported frequency points and all RATs; The camping module is configured to camp on the second cell that does not forbid the low capability terminal device to camp on in a case where the second cell is found.

21. A service method characterized by, The method comprises: In a case where all the detected cells forbid the low capability terminal device to camp on or the signal quality of the detected cell that does not forbid the low capability terminal device to camp on does not meet the requirement of the low capability terminal device, a network side device provides a target service to a low capability terminal device through a first cell, and the target service includes at least one of the following: a broadcast service, an emergency call service; The first cell is a cell that forbids the low capability terminal device to access, and the first cell does not forbid the normal terminal device to access; Before the network side device provides the target service to the low capability terminal device through the first cell, the method further comprises: The network side device sends first indication information to the low capability terminal device, wherein the first indication information is used to indicate that the first cell forbids the low capability terminal to access; The first indication information used to indicate that the first cell forbids the low capability terminal to access includes at least one of the following: The first indication information is used to indicate that 1rx RedCap UE is forbidden to camp on; The first indication information is used to indicate that 2rx RedCap UE is forbidden to camp on.

22. The service method according to claim 21, wherein The first cell includes at least one of the first type of cell and the second type of cell; The first type of cell is a cell that forbids the low capability terminal device to access and meets the cell selection criteria of the low capability terminal device; The second type of cell is a cell that meets at least one of the following conditions in the first type of cell: The public land mobile network (PLMN) corresponding to the low capability terminal device; The tracking area (TA) of the broadcast does not belong to the TA area forbidden by the low capability terminal device.

23. The service method according to claim 22, wherein In a case where the first cell includes the first type of cell and the second type of cell, the network side device provides the target service to the low capability terminal device through the first cell, including: The network side device preferentially provides the target service to the low capability terminal device through the second type of cell.

24. The service method according to claim 21, wherein, The broadcast service includes at least one of the following: Earthquake and tsunami warning system (ETWS) service; Commercial mobile alert system (CMAS) service.

25. The service method according to claim 21, wherein After the network-side device provides the target service to the low-capability terminal device through the first cell, the method further includes: The network-side device provides service to the low-capability terminal device through the second cell in a case where it is determined that there is a second cell that is not prohibited for the low-capability terminal device to camp on.

26. The service method according to claim 25, wherein The second cell includes a suitable cell and / or an acceptable cell that match the low-capability terminal device; The suitable cell belongs to a public land mobile network (PLMN) corresponding to the low-capability terminal device, meets a cell selection criterion of the low-capability terminal device, and a broadcast TA area does not belong to a TA area that is prohibited by the low-capability terminal device. The acceptable cell meets the cell selection criterion of the low-capability terminal device.

27. The service method according to claim 25, wherein Before the network-side device provides service to the low-capability terminal device through the second cell in a case where it is determined that there is a second cell that is not prohibited for the low-capability terminal device to camp on, the method further includes: The network-side device sends third indication information to the low-capability terminal device, where the third indication information is used to indicate that the second cell allows low-capability terminals to access.

28. The service method according to claim 21, wherein Before the network-side device provides the target service to the low-capability terminal device through the first cell, the method further includes: The network-side device sends fourth indication information to the low-capability terminal device, where the fourth indication information is used to indicate whether the low-capability terminal device is allowed to perform inter-frequency cell selection or reselection.

29. A service device, characterized by The service apparatus applied to a network-side device includes: A first service module configured to provide a target service to a low-capability terminal device through a first cell in a case where all detected cells prohibit the low-capability terminal device from camping or signal quality of a detected cell that does not prohibit the low-capability terminal device from camping does not meet a requirement of the low-capability terminal device, the target service including at least one of the following: a broadcast service, an emergency call service. The first cell is a cell that prohibits the low-capability terminal device from accessing, and the first cell does not prohibit a general terminal device from accessing. The service apparatus further includes: A first sending module configured to send first indication information to the low-capability terminal device, where the first indication information is used to indicate that the first cell prohibits low-capability terminals from accessing. The first indication information used to indicate that the first cell prohibits low-capability terminals from accessing includes at least one of the following: The first indication information is used to indicate that 1rx RedCap UEs are prohibited from camping. The first indication information is used to indicate that 2rx RedCap UEs are prohibited from camping.

30. The service device of claim 29, wherein, The first cell includes at least one of a first type of cell and a second type of cell. The first type of cell is a cell that prohibits the low-capability terminal device from accessing and meets a cell selection criterion of the low-capability terminal device. The second type of cell is a cell in the first type of cell that meets at least one of the following conditions: Belongs to a public land mobile network (PLMN) corresponding to the low-capability terminal device. The broadcast tracking area (TA) does not belong to a TA area forbidden for the low capability terminal device.

31. The service device of claim 30, wherein, In a case where the first cell comprises the first type cell and the second type cell, the first service module is specifically configured to: Preferentially provide target service to the low capability terminal device through the second type cell.

32. The service device of claim 29, wherein, Further comprising: A second service module configured to provide service to the low capability terminal device through a second cell in a case where it is determined that there exists the second cell in which the low capability terminal device is allowed to camp on.

33. A terminal device, comprising: A processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the cell selection method according to any one of claims 1 to 16.

34. A network-side device, comprising: A processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the service method according to any one of claims 21 to 28.

35. A readable storage medium characterized by, A program or instructions stored in the readable storage medium, wherein the program or instructions, when executed by the processor, implement the steps of the cell selection method according to any one of claims 1 to 16, or implement the steps of the service method according to any one of claims 21 to 28.

Images