CN112840703A

CN112840703A - Method for selecting cell and terminal equipment

Info

Publication number: CN112840703A
Application number: CN201880098644.5A
Authority: CN
Inventors: 欧阳晓宇; 胡筱
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-10-15
Filing date: 2018-10-15
Publication date: 2021-05-25
Anticipated expiration: 2038-10-15
Also published as: WO2020077486A1; CN115379517A; CN112840703B

Abstract

The application provides a method for selecting a cell and terminal equipment. The method for selecting the cell comprises the following steps: before entering a low power consumption mode PSM, terminal equipment acquires first information, wherein the first information comprises information of a plurality of frequency points, at least two frequency points are different, and the frequency points are used for cell search; after exiting the PSM, the terminal equipment searches the cell based on the stored multiple frequency points and selects a proper serving cell. The technical scheme provided by the application can enable the terminal equipment to withdraw from the PSM to select the cell, and can search the cell according to a plurality of frequency points and select the service cell in time.

Description

Method for selecting cell and terminal equipment

Technical Field

The present application relates to the field of communications, and in particular, to a method for selecting a cell and a terminal device.

Background

Due to the advantages of low power consumption, wide coverage, low cost, high capacity and the like of the narrow-band Internet of things technology, the narrow-band Internet of things technology can be widely applied to the field of Internet of things. However, the application of the narrowband internet of things technology is not wide in the mobile scene of the terminal device. The reason is that network services are constantly changing in the scenario where the terminal device is moving. The terminal equipment needs to switch the serving cell in time, and the terminal equipment cannot be always in an activated state to detect the change of the network service due to the consideration of the service life of the terminal equipment.

In the prior art, in order to prolong the service life of a terminal device, the terminal device is operated in a Power Saving Mode (PSM). However, when exiting the PSM, the terminal device can only perform cell search based on the last resident frequency point and select a suitable cell, so that the terminal device can only perform full-band network search when selecting a cell in the pilot frequency networking mode. Therefore, how to select a serving cell in time by the terminal device in the inter-frequency networking manner becomes an urgent problem to be solved.

Disclosure of Invention

The application provides a cell selection method and terminal equipment, so that the terminal equipment can select a serving cell in time in a pilot frequency networking mode.

In a first aspect, a method for selecting a cell is provided, including: before entering a low power consumption mode PSM, terminal equipment acquires first information, wherein the first information comprises information of a plurality of frequency points, the frequency points are used for cell search, and at least two frequency points in the plurality of frequency points are different; and after the terminal equipment exits the PSM, selecting a cell according to the first information.

According to the method for selecting the cell provided by the embodiment of the application, the terminal equipment can acquire and store the information of a plurality of frequency points before entering the PSM. Then, the terminal equipment can perform cell search based on the stored multiple frequency points when exiting the PSM, and select a suitable cell to camp on. The time delay and the power consumption of the terminal equipment when the terminal equipment selects the cell can be reduced.

With reference to the first aspect, in some implementations of the first aspect, the selecting, by the terminal device, a cell according to the first information includes: the terminal equipment reads the multiple frequency points when exiting the PSM; the terminal equipment carries out energy detection on the multiple frequency points; and the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point in the plurality of frequency points to search the cells and select the cells.

According to the method for selecting the cell provided by the embodiment of the application, the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point based on the different energy of the frequency points to search the cell and select a proper service cell. So that the terminal device can select a suitable cell as soon as possible.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the first information further includes information of a public land mobile network PLMN of at least one network, where the PLMN of the one network corresponds to one or more frequency points, and the one frequency point corresponds to one or more PLMNs of the network; the terminal device acquiring the first information comprises: and the terminal equipment acquires and stores the corresponding relation between the PLMN of the at least one network and the plurality of frequency points.

According to the method for selecting a cell provided by the embodiment of the application, the first information acquired by the terminal device may further include information of a PLMN of a network. Specifically, the PLMN of the network in the first information has a correspondence with the multiple frequency points. The terminal equipment stores the corresponding relation between the PLMN of the network and the plurality of frequency points, so that the terminal equipment can quickly determine the frequency points which can be used for selecting the cells based on the corresponding relation between the PLMN of the network and the plurality of frequency points. And the time delay when the terminal equipment selects the cell is reduced.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the method further includes: after exiting the PSM, the terminal equipment extracts a first frequency point set corresponding to the PLMN of the surrounding network from the first information according to the PLMN of the surrounding network of the terminal equipment, wherein the first frequency point set comprises at least one frequency point; the terminal equipment selects the cell according to the first information, and the method comprises the following steps: the terminal equipment carries out energy detection on the first frequency point set; and the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point in the first frequency point set to search the cells and select the cells.

According to the method for selecting the cell provided by the embodiment of the application, when the terminal equipment stores the corresponding relation between the PLMN of at least one network and a plurality of frequency points and exits from the PSM, the terminal equipment extracts the first frequency point set corresponding to the PLMN of the surrounding network from the stored first information according to the PLMN of the surrounding network, and then sequentially selects the frequency points from large to small according to the energy of each frequency point in the first frequency point set to search the cell. So that the terminal device can select a suitable cell as soon as possible.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, before the terminal device enters PSM, the method further includes: and the terminal equipment detects a first frequency point and stores the first frequency point, wherein the first frequency point is a frequency point other than the plurality of frequency points.

According to the method for selecting the cell provided by the embodiment of the application, when the terminal equipment detects a new frequency point, the new frequency point is stored. Frequency points needing to be stored can be avoided being omitted. The performance of the terminal equipment for selecting the cell is improved.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the method further includes: the terminal equipment reads system information of a service cell and acquires the information of the multiple frequency points; or, the terminal equipment acquires the information of the multiple frequency points when residing in multiple cells corresponding to the multiple frequency points one by one.

According to the method for selecting a cell provided by the embodiment of the present application, the information of the multiple frequency points acquired by the terminal device may be extracted from the system information, or may be the frequency points of the cell where the terminal device resides. And a flexible selection scheme is provided for the terminal equipment to acquire the first information.

In a second aspect, a terminal device is provided, where the terminal device is configured to perform the method for selecting a cell in the first aspect or any possible implementation manner of the first aspect.

In particular, the terminal device may include means for performing the method of the first aspect or any possible implementation manner of the first aspect for selecting a cell.

In a third aspect, a terminal device is provided that includes a processor and a transceiver. Wherein the processor and the transceiver communicate with each other through an internal connection path.

Optionally, the terminal device further comprises a memory for storing instructions, and the processor is configured to execute the instructions stored by the memory.

As an alternative implementation, the processor performs the method of the first aspect or any possible implementation of the first aspect.

In a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of the first aspect or any of its possible implementations.

In a fifth aspect, there is provided a computer program product comprising: computer program code which, when run by a communication unit, a processing unit or a transceiver, a processor of a terminal device, causes the terminal device to perform the method of the first aspect as described above.

In a sixth aspect, a chip system is provided, comprising: a processor configured to support a terminal device to implement the method of the first aspect.

According to the method for selecting the cell and the terminal equipment provided by the embodiment of the application, the terminal equipment stores the information of the multiple frequency points before entering the PSM, and searches the cell based on the multiple frequency points when exiting the PSM, so that a proper cell is selected. The time delay and the power consumption of the terminal equipment when the terminal equipment selects the cell can be reduced.

Drawings

Fig. 1 is a schematic diagram of a system 100 to which the method for selecting a cell according to the embodiment of the present application can be applied.

Fig. 2 is a schematic diagram of intra-frequency networking.

Fig. 3 is a schematic diagram of inter-frequency networking.

Fig. 4 is a schematic diagram of a terminal device operating in a DRX mode.

Fig. 5 is a schematic diagram of a terminal device provided in the present application operating in PSM.

Fig. 6 is a schematic diagram of a method for selecting a cell according to an embodiment of the present application.

Fig. 7 a is a flowchart of a method for using a shared bicycle according to an embodiment of the present application; fig. 7 b is a schematic diagram of a shared bicycle network service switching according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a terminal device 20 provided in the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application is applied to a communication system in which the terminal equipment can work in a Power Saving Mode (PSM).

For example: the method is applied to a narrowband internet of things (NB-IoT) system, or an Enhanced Machine Type Communication (EMTC) system; also for example, it is applied to a future fifth generation (5G) system. Or in mass machine type of communication (mtc) systems, etc.

It should be understood that the technical solutions of the embodiments of the present application can be applied to an NB-IoT communication system or a 5G communication system, which is only an example and is not intended to limit the scope of the present application, and other communication systems capable of supporting a terminal device to operate in PSM are also within the scope of the present application. And are not illustrated one by one here.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

The network device in the embodiment of the present application may be a device for communicating with a terminal device, and the network device may be a network device in the NB-IoT, the EMTC communication system, or the 5G, mMTC communication system, which is not limited in the embodiment of the present application.

In the embodiment of the application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes. Such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system, among others. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided by the embodiment of the present application, as long as the communication can be performed according to the method provided by the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, for example, the execution main body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

In addition, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

As shown in fig. 1, the system 100 includes a network device 102, and the network device 102 may include 1 antenna or multiple antennas. Such as

antennas

104, 106, 108, 110, 112, and 114. Additionally, network device 102 may additionally include: a transmitter chain and a receiver chain.

It will be appreciated by those of ordinary skill in the art that the transmitter and receiver chains can each comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.).

Network device 102 may communicate with a plurality of terminal devices (e.g., terminal device 116 and terminal device 122 shown in fig. 1). However, it is understood that network device 102 may communicate with any number of terminal devices similar to terminal device 116 or terminal device 122.

End devices

116 and 122 may be various devices that communicate with network device 102, for example, end device 116 may be a cellular phone, a smart phone, a laptop, a handheld communication device, a handheld computing device, a satellite radio, a global positioning system, a PDA, and/or any other suitable device for communicating over wireless communication system 100.

As shown in fig. 1, terminal device 116 is in communication with

antennas

112 and 114. Where

antennas

112 and 114 transmit information to terminal device 116 over a forward link (also called a downlink) 118 and receive information from terminal device 116 over a reverse link (also called an uplink) 120.

In addition, terminal device 122 is in communication with

antennas

104 and 106. Where

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

For example, in a Frequency Division Duplex (FDD) system. For example, forward link 118 may use a different frequency band than reverse link 120, and forward link 124 may use a different frequency band than reverse link 126.

As another example, in Time Division Duplex (TDD) systems and full duplex (full duplex) systems, forward link 118 and reverse link 120 may utilize a common frequency band and forward link 124 and reverse link 126 may utilize a common frequency band.

Each antenna (or group of antennas consisting of multiple antennas) and/or area designed for communication is referred to as a sector of network device 102.

For example, antenna groups may be designed to communicate to terminal devices in a sector of the areas covered by network device 102. A network device may transmit signals to all terminal devices in its corresponding sector through single-antenna or multi-antenna transmit diversity. During communication by network device 102 with

terminal devices

116 and 122 over

forward links

118 and 124, respectively, the transmitting antennas of network device 102 may also utilize beamforming to improve signal-to-noise ratio of

forward links

118 and 124.

Moreover, mobile devices in neighboring cells can experience less interference when network device 102 utilizes beamforming to transmit to

terminal devices

116 and 122 scattered randomly through an associated coverage area, as compared to a manner in which the network device transmits signals to all of its terminal devices through single-antenna or multi-antenna transmit diversity.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting apparatus and/or a wireless communication receiving apparatus. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (e.g., generate, receive from other communication devices, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.

In addition, the system 100 may be a PLMN network, a D2D network, an M2M network, an IoT network, or other networks, fig. 1 is a simplified schematic diagram for example, and other network devices may be included in the network, which are not shown in fig. 1.

It should be understood that fig. 1 is only a simple schematic diagram for illustrating a scenario in which the method for selecting a cell provided in the embodiment of the present application is applicable, and does not constitute any limitation to the present application.

In the following, to facilitate understanding of the method for selecting a cell provided in the embodiments of the present application, several basic concepts are first introduced.

1. And (4) networking with the same frequency.

In the divided cells, the same carrier frequency is uniformly used. The same frequency networking mode is suitable for the conditions that the frequency spectrum resources of operators are short and the bandwidth of a communication system is wide. As shown in fig. 2.

Fig. 2 is a schematic diagram of intra-frequency networking. The diagram includes a plurality of cells using carrier frequency 1.

The advantages of the same-frequency networking include:

1) the minimum frequency spectrum resources are utilized, and the frequency spectrum efficiency is high;

2) the interference problem can be overcome to a certain extent by the edge position of the cell, and the user experience is improved.

Disadvantages of on-channel networking include:

1) the difficulty of network construction is high, the control requirement on overlapping coverage is high, and the requirements on network structure and station site conditions are strict;

2) the performance of the same-frequency network is rapidly reduced along with the increase of the load, the edge rate is low, and the user perception capability is poor.

2. And (4) carrying out pilot frequency networking.

In the divided cells, different carrier frequencies are used. As shown in fig. 3.

Fig. 3 is a schematic diagram of inter-frequency networking. The diagram includes a plurality of cells using different carrier frequencies.

The advantages of inter-frequency networking include:

1) the difficulty of network construction is low, the control requirement on overlapping coverage and the requirements on network structure and site conditions are low;

2) the performance of the same-frequency network is slightly influenced by network load, and the user perception is good;

3) the same frequency interference can be greatly reduced, higher throughput rate is easy to realize, and the network competition advantage is improved;

4) when the frequency spectrum resources are sufficient, the throughput rate can be effectively improved.

The disadvantages of inter-frequency networking include:

1) more frequency spectrum resources are utilized;

2) a small amount of power consumption for cell reselection increases.

3. And (5) system information.

The system message includes 1 Master Information Block (MIB) and a plurality of System Information Blocks (SIBs).

Wherein, the MIB message is broadcasted on a Physical Broadcast Channel (PBCH); the SIB is issued by Radio Resource Control (RRC) messages of a Physical Downlink Shared Channel (PDSCH).

In particular, the present application relates primarily to SIB1 and SIB5 of the above SIBs. The following briefly introduces SIB1 and SIB 5.

1) The SIB1 includes information required for terminal cell access and scheduling information of other SIBs in a system information block type 1(system information block type1) message:

a Public Land Mobile Network (PLMN) identity of the network;

tracking Area Code (TAC) and cell Identification (ID);

a cell forbidden state indicating whether a user can reside in a cell;

selecting a cell criterion indicating a minimum level of acceptance required;

transmission times and periods of other SIBs.

2) The SIB5 includes neighbor cell information for inter-frequency cell reselection, such as: neighbor list, carrier frequency, cell reselection priority, threshold of user from current serving cell to other high or low priority frequencies, etc.

With the rapid development of communication technology, mobile communication is moving from human-to-human connection to human-to-object and object-to-object connection, and the trend of everything interconnection is inevitable.

However, the object-to-object connectivity is insufficient based on the current 4G network. In fact, compared with short-distance communication technologies such as bluetooth and wireless personal area network (ZigBee), a cellular network has the characteristics of wide coverage, mobility, a large number of connectable terminal devices, and the like, and the cellular network can bring a richer application scene for connection between objects. The cellular network communication technology is supposed to become the main connection technology of the internet of things.

NB-IoT is an emerging technology in the field of internet of things. The NB-IoT is built into the cellular network, consuming only about 180KHz of bandwidth. The NB-IoT may be directly deployed in a global system for mobile communications (GSM) network, a Universal Mobile Telecommunications System (UMTS) network, or a Long Term Evolution (LTE) network, so as to reduce the deployment cost of the NB-IoT and achieve smooth upgrade of the communication technology.

Specifically, NB-IoT includes the following four major features:

one, wide coverage. Under the same frequency band, the gain of NB-IoT is 20dB greater than that of the existing network, which is equivalent to improving the capacity of 100 times of the coverage area;

and secondly, the capacity of supporting mass connection is achieved. One sector of the NB-IoT can support 10 ten thousand connections, and support low delay sensitivity, ultra-low equipment cost, low equipment power consumption and optimized network architecture;

and thirdly, the power consumption is lower. NB-IoT connected terminals can support standby times up to 10 years;

and fourthly, the cost is lower. Enterprises expect that the individual connected modules of NB-IoT do not exceed $ 5.

Because of the advantages of low power consumption, wide coverage, low cost, large capacity and the like of the NB-IoT. The NB-IoT communication technology can be widely applied to various industries. Such as remote meter reading, smart parking, smart city, etc.

However, the application scenarios of NB-IoT communication technologies are currently limited to fixed reporting services. The application in the mobile scenario is not very wide, because the network service in the mobile scenario is constantly changing and needs to be switched in time, but due to the consideration of service life, the terminal device cannot be always in an activated state to detect the change of the network service.

In the current mobile scenario, the terminal device mainly adopts two schemes for switching network services:

first, the terminal device operates in an extended discontinuous reception (eDRX) mode, or the terminal device operates in a Discontinuous Reception (DRX) mode. The terminal equipment realizes the switching of network services through a cell reselection mechanism;

and secondly, the terminal equipment works in the PSM. And the terminal equipment realizes the switching of the network service by exiting the PSM network re-searching mechanism.

The terminal equipment works in eDRX, DRX and PSM, and is a technology capable of saving power consumption when the terminal equipment in NB-IoT carries out network service switching.

The principle of the terminal equipment working in the PSM is to allow the terminal equipment to close the receiving and sending of signals and the related functions of an access layer after entering an idle state for a period of time, which is equivalent to partial shutdown, thereby reducing the power consumption of antennas, radio frequencies, signaling processing and the like. The terminal device does not accept paging of any network device during PSM. For the network device side, the terminal device in PSM is not reachable.

The terminal equipment works in DRX, which supports that the terminal equipment does not continuously detect the signal quality of a service cell and a neighbor cell any more, thereby achieving the purpose of saving power consumption.

eDRX is an enhancement to DRX technology. Therefore, when the terminal device works in the eDRX, a longer detection period of the terminal device is supported, so that the purpose of saving power consumption is achieved.

The DRX mode and PSM described above will be briefly described below with reference to fig. 4 and 5.

In a scenario that a terminal device moves, a common operating mode of the terminal device is to operate in a DRX mode, and implement a handover of a network service through a cell reselection mechanism.

Fig. 4 is a schematic diagram of a terminal device operating in a DRX mode. The schematic includes seven steps S410-S470, which are described in detail below.

S410, the terminal equipment enters an idle state.

The terminal device returns to the idle state after the connection is released. The IDLE state refers to a state in which the terminal device is in a radio resource control IDLE (RRC IDLE) state. In particular, the IDLE state may also be referred to as an IDLE state.

Further, the terminal device in the idle state measures the signal of the serving cell at intervals of one DRX cycle.

Specifically, the measuring, by the terminal device, the signal of the serving cell includes: a value of Reference Signal Received Power (RSRP) of a measurement serving cell, a value of Reference Signal Received Quality (RSRQ) of a measurement serving cell, and a signal to interference plus noise ratio (SINR) and a Received Signal Strength Indicator (RSSI).

In this embodiment, a signal value of a serving cell measured by a terminal device or a measurement value based on a signal of the serving cell is referred to as a first measurement value.

S420, determining whether the first measurement value is lower than a reselection measurement starting threshold.

Specifically, the reselection measurement starting threshold refers to a threshold at which the terminal device starts cell reselection measurement. Specifically, the threshold for cell reselection measurement is a reselection measurement threshold specified by a cell reselection criterion when the terminal device performs cell reselection measurement in the prior art. This is not limited by the present application and is not specifically described.

When the first measurement value is lower than the reselection measurement starting threshold, the terminal device performs S430. And when the first measurement value is not lower than the reselection measurement starting threshold, the terminal equipment does not perform cell reselection measurement and is still in an idle state.

S430, the terminal equipment starts the measurement of the same frequency or different frequencies.

And when the first measurement value is lower than the reselection measurement starting threshold, the terminal equipment starts the same-frequency or different-frequency measurement and measures the signals of the adjacent cells by taking one DRX period as a time interval.

Specifically, the measuring, by the terminal device, signals of the neighboring cells includes: measuring the value of the RSRP of the neighbor cell and measuring the value of the RSRQ of the neighbor cell as well as the SINR and RSSI.

In this embodiment, the signal value of the neighboring cell measured by the terminal device or the measurement value based on the signal of the neighboring cell is referred to as a second measurement value.

Further, whether the terminal equipment performs the same-frequency or different-frequency measurement is related to the condition met by the first measurement value. This is not referred to in the present application and will not be described in detail here.

And S440, judging whether the second measured value meets a preset condition.

And when the signal quality of the adjacent cell is higher than that of the serving cell for a period of time, cell reselection is started. And switching to the network service of the adjacent cell. It should be understood that the specific duration of the "period of time" referred to in this application is dictated by the communication system and the application is not limited.

That is, when the second measurement value satisfies the reselection criterion, the terminal device executes S450 to perform cell reselection. When the second measurement value does not satisfy the reselection criterion, the terminal device continues to perform S430 to perform intra-frequency or inter-frequency measurement.

And S460, judging whether the cell reselection is successful.

When the cell reselection is successful, the terminal equipment is continuously in an idle state; when the cell reselection fails, the terminal device needs to perform S470, and then continues to camp on the current serving cell.

The terminal device shown in fig. 4 operates in DRX mode. Before finishing cell reselection, the terminal equipment needs to keep measuring a serving cell signal and a neighboring cell signal with a DRX period as a time interval; after the cell reselection is completed, the terminal device still needs to maintain the signal of the cell serving the terminal device after the measurement reselection, in order to ensure that the network service does not change.

Further, the terminal device shown in fig. 4 operates in the DRX mode. The terminal device needs to spend a lot of time to complete cell reselection, i.e. the time delay and power consumption required for network service handover are very large.

It should be understood that fig. 4 illustrates that when the terminal device operates in the DRX mode, the terminal device also operates in the eDRX mode, which may cause a delay and power consumption required for network service handover to be very large, and will not be described herein again.

In a scenario that the terminal device is mobile, another common operating mode of the terminal device is that the terminal device operates in the PSM, and the terminal device searches for a network again by exiting the PSM to implement a handover of a network service.

Fig. 5 is a schematic diagram of a terminal device provided in the present application operating in PSM. The schematic includes six steps S510-S560, which are described in detail below.

S510, the terminal equipment enters an idle state.

The terminal device returns to the idle state after the connection is released.

S520, the terminal enters PSM.

Specifically, the PSM may be entered after the terminal device is in the idle state for a period of time. The duration of the idle state for a period of time is not limited in the present application, and may be specified by a protocol or notified to the terminal device by the network device.

It should be understood that the terminal does not detect the surrounding network in PSM. That is, the terminal equipment in PSM does not detect signals of the serving cell and the neighboring cell as shown in fig. 4, which can save power consumption.

S530, the terminal exits PSM.

Specifically, when the terminal needs to be woken up, the terminal exits PSM and enters an idle state. The terminal device is awakened, that is, the terminal device may need to receive information sent by the network device, or the terminal device is awakened when the terminal device meets a preset awakening condition.

For example, the terminal device satisfying the preset wake-up condition may be when a Tracking Area Update (TAU) period request timer expires, or the terminal device actively exits the PSM due to mobile dream (MO) service to be processed.

In the present application, under what kind of condition the terminal device is, the preset wake-up condition is satisfied and is not limited, and the preset wake-up condition may be any one of the wake-up conditions in the prior art.

And S540, the terminal equipment searches the last resident frequency point.

And the terminal equipment selects the cell according to the frequency point of the cell which is resided last time. The cell in which the terminal device resides last time is the cell in which the terminal device resides before entering the idle state.

And S550, judging whether the cell is found.

When the terminal equipment selects the cell according to the frequency point of the cell which is resided last time, if the suitable cell cannot be found under the frequency point, the terminal equipment executes S560 to perform full-band network searching.

The full-band network searching refers to that the terminal equipment performs full-band searching according to self capacity and setting and tries to read information of a strongest signal cell on each frequency point. Once the terminal device performs the full-band network searching, the power consumption of the terminal device is large, and the time delay for selecting the cell is large.

As shown in fig. 5, the terminal device operates in PSM. And the network service switching is realized by exiting the PSM network searching mechanism again. Under the same-frequency networking mode, the mode has lower time delay and power consumption; however, in the pilot frequency networking mode, since the frequency points deployed by each cell are different, the cell cannot be directly selected according to the frequency point of the last resident cell, and the time delay and power consumption for performing full-band network searching are very large, or the service time delay and power consumption are very large because the terminal device selects a poor cell, or the terminal device cannot select a cell with the same frequency.

The method aims to solve the problems of time delay and power consumption in network service switching. The application provides a method for selecting a cell. The time delay and the power consumption during network service switching can be reduced, and the terminal equipment can quickly and accurately select a proper serving cell after exiting the PSM. The method for selecting a cell according to the embodiment of the present application is described in detail below with reference to fig. 6.

Fig. 6 is a schematic diagram of a method for selecting a cell according to an embodiment of the present application. The schematic includes S610-S620. Two steps, which are described in detail below.

S610, the terminal device obtains the first information.

The method comprises the steps that terminal equipment obtains first information before entering a low power consumption mode PSM, wherein the first information comprises information of a plurality of frequency points, and the frequency points are used for searching cells. At least two of the frequency points are different, for example, the frequency points include frequency point information of a serving cell of the current terminal device and different frequency points different from the frequency point of the serving cell, and the serving cell provides a serving cell for the terminal device.

Optionally, in some embodiments, the terminal device reads system information of the serving cell to obtain the first information.

For example, after the terminal device enters the idle state, the terminal device reads the system message of the serving cell. And acquiring PLMN and frequency point information of the serving cell in the SIB1 and pilot frequency point information in the SIB 5.

Optionally, in other embodiments, when the terminal device resides in a plurality of cells corresponding to the plurality of frequency points one to one, the information of the plurality of frequency points is obtained.

For example, the first information includes A, B, C, D, E information of five frequency points. The information of the frequency points A-E is respectively the information of the frequency points acquired by the terminal equipment when the cell A-cell E resides.

That is, the terminal device may obtain the first information by reading a system message of the serving cell, or by obtaining information of different frequency points when camping in different cells. Specifically, the terminal device may also obtain the first information by other manners, which are not illustrated here.

Optionally, the first information further includes information of a PLMN of at least one network, where the PLMN of the one network corresponds to one or more frequency points, and the one frequency point corresponds to one or more PLMNs of the network;

the terminal device obtaining the first information further comprises:

and the terminal equipment acquires the corresponding relation between the PLMN of the at least one network and the plurality of frequency points.

For example, a PLMN of a network in the first information corresponds to one or more frequency bins.

The first information comprises information of PLMN (A, B, C) of 3 networks and information of 9 frequency points (a1, a2, a3, b1, b2, b3, c1, c2 and c 3). Wherein, A corresponds to a1, a2 and a 3; b corresponds to B1, B2, B3; c corresponds to C1, C2, C3. Then, the terminal device obtains and stores the correspondence between the PLMN of the at least one network and the multiple frequency points, which is referred to in table 1 below.

PLMN of a network	Frequency point
A	a1、a2、a3
B	b1、b2、b3
C	c1、c2、c3

Or, one frequency point corresponds to one or more PLMNs of the network.

The first information comprises information of PLMN (A, B, C) of 3 networks and information of 3 frequency points (a1, a2 and a 3). Wherein a1 corresponds to A, B, C; a2 corresponds to A, B, C; a3 corresponds to A, B, C. Then, the terminal device stores the correspondence between the PLMN of the at least one network and the multiple frequency points, which is referred to in table 2 below.

Frequency point	PLMN of a network
a1	A、B、C
a2	A、B、C
a3	A、B、C

Optionally, fig. 6 further includes S611, where the terminal device stores the first frequency point.

Specifically, before the terminal device acquires and stores the first information, the method further includes:

and when the terminal equipment detects a first frequency point, storing the first frequency point, wherein the first frequency point is a frequency point other than the plurality of frequency points in the S610.

For example, when the terminal device detects that the surrounding network environment changes, the first frequency point is detected, or the number of the frequency points deployed by the network device changes, and the terminal device is notified that the first frequency point is added. Specifically, the terminal device stores the first frequency point in a storage unit of the terminal device, which can be understood as updating the first information and updating the corresponding relationship between the PLMN of the network and the plurality of frequency points.

It should be understood that the change in the network around the terminal device may be any change in the network environment. This is not further enumerated here. The present application is not limited to this, and as long as the terminal device detects that the information of the frequency point or the information of the PLMN of the network changes, the terminal device may update the stored first information.

Specifically, the terminal device may save the acquired first information in a memory of the terminal device. For example, in a flash memory (flash) of the terminal device.

Further, fig. 6 also includes S612, and the terminal device enters PSM.

The terminal equipment enters the PSM when a first preset condition is met. Specifically, the first preset condition may be that the terminal device is in an idle state for a period of time, or the first preset condition may be that a timer set by the terminal device for entering the PSM reaches a preset time, or the first preset condition may be any condition that the terminal device can enter the PSM in the prior art. This is not limited by the present application.

S620, the terminal equipment selects a cell.

And after exiting the PSM, the terminal equipment selects a cell according to the first information.

For example, the terminal device exits the PSM when a second preset condition is met, where the second preset condition may be that a TAU period request timer of the terminal device expires, or that the terminal device has an MO service to process and actively exits the PSM, or the second preset condition may be any condition in the prior art that enables the terminal device to exit the PSM. This is not limited by the present application.

Optionally, in some embodiments, the selecting, by the terminal device, a cell according to the first information includes: after exiting the PSM, the terminal device reads the multiple frequency points stored in S610, and performs energy detection on the multiple frequency points; and the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point in the plurality of frequency points to search the cells and select the cells.

For example, the terminal device stores N frequency points before entering the PSM, where N is an integer greater than 1. Then, the terminal device reads the N frequency points from the storage unit after exiting the PSM. And detecting the energy of the N frequency points, and sequentially selecting the frequency points from large to small according to the energy of each frequency point to search the cells. When the cell search is carried out based on the frequency point with the maximum energy to find a proper cell, the cell selection is completed; and when the cell search is carried out based on the frequency point with the maximum energy and a proper cell is not found, carrying out the cell search based on another frequency point with the energy second to the frequency point with the maximum energy. And so on, until a suitable cell is found. If the terminal equipment performs cell search based on the N frequency points, and still does not find a suitable cell, the terminal equipment performs full-band network search.

Optionally, in other embodiments, after the terminal device exits PSM, a first frequency point set corresponding to a PLMN of a surrounding network of the terminal device is extracted from the first information according to the PLMN of the surrounding network, where the first frequency point set includes at least one frequency point; the terminal equipment selects the cell according to the first information, and the method comprises the following steps: the terminal equipment carries out energy detection on the first frequency point set; and the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point in the first frequency point set to search the cells and select the cells.

For example, after the terminal exits PSM, PLMNs of the surrounding network of the location where the terminal is located include: A. and B.

When the terminal device stores the correspondence between the PLMN of the at least one network and the plurality of frequency points as shown in table 1 above. The first set of bins is 6 bins (a1, a2, a3, b1, b2, b 3). And according to the acquired information of the 6 frequency points, carrying out energy detection on the 6 frequency points. And preferentially selecting the frequency point with the highest energy to search the cell and selecting the cell.

When the terminal device stores the correspondence between the PLMN of the at least one network and the plurality of frequency points as shown in table 2 above. The first set of bins is 3 bins (a1, a2, a 3). And according to the acquired information of the 3 frequency points, carrying out energy detection on the 3 frequency points. And preferentially selecting the frequency point with the highest energy to search the cell and selecting the cell.

And if no suitable cell is found based on the stored multiple frequency points, performing full-band network searching.

The method for selecting a cell provided by the present application is described below with reference to specific embodiments.

Fig. 7 is a schematic diagram of an embodiment provided by an embodiment of the present application. Fig. 7 a is a flowchart of a method for using a shared bicycle according to an embodiment of the present application.

Specifically, a in fig. 7 shows that in the use process of the shared bicycle, the narrowband internet of things, the internet of things platform, the shared bicycle service platform, and an application (App) corresponding to the mobile phone are required to provide support.

Further, a detailed description is given with reference to b in fig. 7 to describe how to perform network service switching when the shared bicycle is connected in the narrowband internet of things.

Fig. 7 b is a schematic diagram of a shared bicycle network service switching according to an embodiment of the present application. The schematic includes S710-S793.

And S710, the shared bicycle intelligent lock enters an idle state.

In the driving process, the bicycle lock module chip of the shared bicycle enters an idle state.

S720, the intelligent lock acquires a system message.

And after the bicycle lock module chip of the shared bicycle enters an idle state, the system information of the service cell is acquired.

Specifically, a shared bicycle is taken as an example of a shared bicycle in a pilot frequency networking. Then, the lock module chip of the sharing bicycle receives SIB1 and SIB5 in the system information of the serving cell. Acquiring frequency points of PLMN and serving cells of the shared-bicycle surrounding network in SIB1, and acquiring pilot frequency points in SIB 5.

For example, the smart lock reads the system message, and obtains the PLMN information of the surrounding networks as A, B; further, a corresponds to two bins (a1, a2) and B corresponds to three bins (B1, B2, B3).

And S730, updating the frequency point information by the intelligent lock.

The intelligent lock detects that the surrounding network environment changes and a new frequency point exists. And updating the corresponding relation between the PLMN of the network maintained by the intelligent lock and the plurality of frequency points.

For example, the smart lock detects that the PLMN of the network is a, and newly deploys a frequency point a 3. Then, the correspondence between the PLMN of the network and the multiple frequency points in S720 is updated as:

a corresponds to three frequency points (a1, a2, a3), and B corresponds to three frequency points (B1, B2, B3).

And S740, intelligently latching frequency storage point information.

And the vehicle lock module chip of the shared bicycle stores the acquired information of the frequency points, the information of the PLMN of the network and the corresponding relation between the PLMN of the network and the plurality of frequency points into a flash of the vehicle lock module chip.

For example, assume that the smart lock acquires information as shown in S730. Then, the above-mentioned intelligent lock stores the frequency points, the PLMN of the network and the corresponding relationship between the PLMN of the network and the plurality of frequency points, see the following table-table 3

PLMN of a network	Frequency point
A	a1、a2、a3
B	b1、b2、b3

S750, the intelligent lock enters the PSM.

When the shared bicycle is driven for a long enough time, the lock module chip enters the PSM.

S760, the intelligent lock exits the PSM.

And after the shared bicycle reaches the destination, the bicycle lock module chip exits the PSM.

And S770, reading the frequency point information by the intelligent lock.

After the destination is reached, the vehicle lock module chip wakes up from the PSM mode, and at the moment, the network condition around the shared bicycle is changed. And the vehicle lock module chip reads out the frequency point information of the network around the shared bicycle stored in the flash.

For example, when the PLMN sharing the network around the bicycle is a after the destination is reached, the frequency point information read from the flash by the car lock module chip is a1, a2, a 3.

And S780, the intelligent lock performs energy detection on frequency points corresponding to the PLMN of the surrounding network. And according to the energy of each frequency point, sequencing from large to small, and sequentially selecting the frequency points from high to low according to the energy sequencing to search and select the cells.

And S790, selecting the frequency point with the highest energy by the intelligent lock to search the cell.

And S791, judging whether a suitable cell is found.

If a suitable cell has been found, the cell search is completed. If no suitable cell is found, S792 is executed to judge whether other frequency points exist. Namely, whether the frequency points read from the flash are searched is judged.

And if no other frequency points exist, executing S793 and searching the network in the full frequency band.

If there are other frequency points, executing S790, selecting the frequency point with the highest energy from the rest frequency points to search the cell.

For example, the energy ordering of the frequency points a1, a2 and a3 in S770 is a1> a2> a 3. Then the smart lock selects a1, a2, a3 in turn for cell search and selects a cell. Specifically, when the smart lock selects a1 to perform cell search and successfully select a cell, the smart lock completes cell selection; when the cell search is not successfully selected by the intelligent lock selection a1, the cell search is performed by the intelligent lock selection a 2; when the cell search is not successfully selected by the intelligent lock selection a2, the cell search is performed by the intelligent lock selection a 3; when the intelligent lock selects a3 to search the cell, the intelligent lock searches the network in the full frequency band.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The method for selecting a cell provided in the embodiment of the present application is described in detail above with reference to fig. 6 and 7, and the terminal device in the embodiment of the present application is described in detail below with reference to fig. 8 and 9.

According to the foregoing method, fig. 8 is a schematic diagram of a terminal device 10 provided in this embodiment of the present application, and as shown in fig. 8, the apparatus 10 may be a terminal device (e.g., the terminal device described above), or may be a chip or a circuit, such as a chip or a circuit that may be disposed on the terminal device. The terminal device may correspond to the terminal device in the method.

The apparatus 10 may include a processor 11 (i.e., an example of a processing unit) and a memory 12 (i.e., an example of a storage unit). The memory 12 is configured to store instructions, and the processor 11 is configured to execute the instructions stored by the memory 12 to enable the apparatus 10 to implement the steps performed by the terminal device (e.g., terminal device) in the corresponding methods shown in fig. 6 and 7.

Further, the terminal device 10 may further include an input port 13 (i.e., one example of a receiving unit) and an output port 14 (i.e., another example of a transmitting unit). Further, the processor 11, the memory 12, the input port 13 and the output port 14 may communicate with each other via internal connection paths, passing control and/or data signals. The memory 12 is used for storing a computer program, and the processor 11 may be used for calling and running the computer program from the memory 12 to control the input port 13 to receive a signal and the output port 14 to send a signal, so as to complete the steps of the terminal device in the above method. The memory 12 may be integrated in the processor 11 or may be provided separately from the processor 11.

Alternatively, if the device 10 is a terminal, the input port 13 is a receiver and the output port 14 is a transmitter. Wherein the receiver and the transmitter may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver.

Alternatively, if the device 10 is a chip or a circuit, the input port 13 is an input interface, and the output port 14 is an output interface.

As an implementation manner, the functions of the input port 13 and the output port 14 may be implemented by a transceiver circuit or a dedicated chip for transceiving. The processor 11 may be considered to be implemented by a dedicated processing chip, processing circuitry, a processor, or a general purpose chip.

As another implementation manner, a manner of using a general-purpose computer to implement the terminal device provided in the embodiment of the present application may be considered. Program codes that will implement the functions of the processor 11, the input port 13 and the output port 14 are stored in the memory 12, and a general-purpose processor implements the functions of the processor 11, the input port 13 and the output port 14 by executing the codes in the memory 12.

In the embodiment provided by the present application, the memory 12 is configured to acquire and store first information, where the first information includes multiple frequency points, where the frequency points are used for cell search, and at least two of the multiple frequency points are different;

a processor 11, configured to select a cell according to the first information after the terminal equipment exits PSM.

The terminal device 10 corresponds exactly to the terminal device in the method embodiment, and the corresponding units of the terminal device 10 are configured to perform the corresponding steps performed by the terminal device in the method embodiments shown in fig. 6 and 7.

Wherein the memory 12 in the terminal device 10 performs the steps stored in the method embodiments. For example, step S610 in fig. 6 in which the terminal device acquires and stores the first information is performed. The processor 11 performs the steps implemented or processed internally by the terminal device in the method embodiment. For example, step S620 in fig. 6 is executed in which the terminal device selects a cell.

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the terminal device 10, please refer to the descriptions of the foregoing methods or other embodiments, which are not described herein again.

Fig. 9 is a schematic structural diagram of a terminal device 20 provided in the present application. The terminal device 20 is applicable to the system shown in fig. 1. For convenience of explanation, fig. 9 shows only main components of the terminal device. As shown in fig. 9, the terminal device 20 includes a processor, a memory, a control circuit, an antenna, and an input-output means.

The processor is mainly configured to process a communication protocol and communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above embodiment of the method for indicating a transmission precoding matrix. The memory is mainly used for storing software programs and data, for example, the codebook described in the above embodiments. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 9 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal device, execute a software program, and process data of the software program.

The processor in fig. 9 integrates the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

For example, in the embodiment of the present application, the antenna and the control circuit having the transceiving function may be regarded as the transceiving unit 201 of the terminal device 20, and the processor having the processing function may be regarded as the processing unit 202 of the terminal device 20. As shown in fig. 9, the terminal device 20 includes a transceiving unit 201 and a processing unit 202. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Optionally, a device for implementing the receiving function in the transceiver 201 may be regarded as a receiving unit, and a device for implementing the transmitting function in the transceiver 201 may be regarded as a transmitting unit, that is, the transceiver 201 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitting circuit, etc.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for selecting a cell, comprising:

before entering a low power consumption mode PSM, terminal equipment acquires first information, wherein the first information comprises information of a plurality of frequency points, the frequency points are used for cell search, and at least two frequency points in the plurality of frequency points are different;

and after exiting the PSM, the terminal equipment selects a cell according to the first information.
The method of claim 1, wherein the terminal device selecting a cell according to the first information comprises:

the terminal equipment respectively detects the energy of the frequency points;

and the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point in the plurality of frequency points to search the cells and select the cells.
The method according to claim 1 or 2, wherein the first information further comprises information of at least one network of public land public mobile network, PLMN, wherein the PLMN of the one network corresponds to one or more frequency points corresponding to PLMNs of the one or more networks;

the terminal device obtaining the first information further comprises:

and the terminal equipment acquires the corresponding relation between the PLMN of the at least one network and the plurality of frequency points.
The method of claim 3, wherein the method further comprises:

after exiting the PSM, the terminal equipment acquires a first frequency point set corresponding to the PLMN of the surrounding network from the first information according to the PLMN of the surrounding network of the terminal equipment, wherein the first frequency point set comprises at least one frequency point;

the terminal equipment selects the cell according to the first information, and the method comprises the following steps:

the terminal equipment carries out energy detection on each frequency point in the first frequency point set;

and the terminal equipment selects the frequency points in sequence from large to small according to the energy of each frequency point in the first frequency point set to search the cells and select the cells.
The method of any one of claims 1-4, wherein prior to the terminal device entering PSM, the method further comprises:

and the terminal equipment detects a first frequency point and stores the first frequency point, wherein the first frequency point is a frequency point other than the plurality of frequency points.
The method of any one of claims 1-5, further comprising:

the terminal equipment reads system information and acquires the information of the multiple frequency points; alternatively, the first and second electrodes may be,

and the terminal equipment respectively acquires the information of the frequency points when residing in a plurality of cells corresponding to the frequency points one by one.
A terminal device, comprising:

a storage unit, configured to obtain first information before the terminal device enters a low power consumption mode PSM, where the first information includes information of multiple frequency points, where the frequency points are used for cell search, and at least two of the multiple frequency points are different;

a processing unit, configured to select a cell according to the first information after the terminal equipment exits PSM.
The terminal device of claim 7, wherein the processing unit to select a cell based on the first information comprises:

the processing unit respectively detects the energy of the frequency points;

and the processing unit selects the frequency points in sequence from large to small according to the energy of each frequency point in the plurality of frequency points to search the cells and select the cells.
The terminal device of claim 7 or 8, wherein the first information further comprises information of a public land mobile network, PLMN, of at least one network, wherein the PLMN of the one network corresponds to one or more frequency points, and the one frequency point corresponds to a PLMN of the one or more networks;

the obtaining of the first information by the storage unit further includes:

and the storage unit acquires the corresponding relation between the PLMN of the at least one network and the plurality of frequency points.
The terminal device of claim 9, wherein the processing unit is further to:

after the terminal equipment exits the PSM, reading a first frequency point set corresponding to the PLMN of the surrounding network from the first information according to the PLMN of the surrounding network of the terminal equipment, wherein the first frequency point set comprises at least one frequency point;

the processing unit selecting a cell according to the first information comprises:

the processing unit carries out energy detection on each frequency point in the first frequency point set;

and the processing unit selects the frequency points in sequence from large to small according to the energy of each frequency point in the first frequency point set to search the cells and select the cells.
The terminal device of any of claims 7-10, wherein prior to the terminal device entering PSM, the memory unit is further to:

and when the processing unit detects a first frequency point, storing the first frequency point, wherein the first frequency point is a frequency point other than the plurality of frequency points.
The terminal device according to any one of claims 7 to 11, wherein the processing unit is further configured to read system information of a serving cell, and obtain information of the multiple frequency points; alternatively, the first and second electrodes may be,

the storage unit is further configured to, when the terminal device resides in a plurality of cells corresponding to the plurality of frequency points one to one, respectively obtain information of the plurality of frequency points.