CN112423371A

CN112423371A - Method, system and device for selecting cell

Info

Publication number: CN112423371A
Application number: CN201910770060.4A
Authority: CN
Inventors: 王宏; 李秉肇; 王学龙; 陈磊; 许斌
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2021-02-26
Anticipated expiration: 2039-08-20
Also published as: CN112423371B; WO2021031932A1

Abstract

The embodiment of the application provides a cell selection method, which is applied to the field of wireless communication and comprises the following steps: the method comprises the steps that User Equipment (UE) receives first power information corresponding to a first cell from first network equipment, wherein the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer larger than 1, and M is smaller than or equal to N; the UE determines whether to select the first cell according to the first power information. On one hand, by configuring corresponding power parameters, the UE with different power levels can have the same cell selection threshold, namely, the cell selection is performed fairly; on the other hand, since UEs of different power classes have different uplink powers, their uplink transmissions may require different numbers of repetitions when transmitting the same content. For this reason, the first network device may configure respective power parameters for UEs of different power classes, so that the UEs of different power classes have a difficulty in selecting a cell.

Description

Method, system and device for selecting cell

Technical Field

The present application relates to the field of wireless communications, and in particular, to a method, a system, and an apparatus for cell selection.

Background

In a cellular communication system, when a User Equipment (UE) performs cell selection, it needs to measure a cell first and determine a suitable cell according to the measurement result. In the prior art, the UE determines whether a cell is a suitable cell by using a cell selection criterion (i.e., S-criterion), wherein the S-criterion is a cell reception level value S_rxlevGreater than zero and cell signal quality value S_qualGreater than zero.

In the S-criterion, UEs of different power classes (power classes) may be based on S_rxlevDetermining different downlink signal coverage areas in which the UE can communicate, wherein the power level defines the maximum output power of the UE, the lower the power level of the UE is, the smaller the maximum output power is, and further the uplink signal coverage area is, and as the cell selection refers to the received power and the signal quality of the downlink signal, considering the uplink signal coverage area, according to S_rxlevThe smaller the coverage of the determined downlink signal, i.e. the UE farther away from the network device may not be able to select the cell corresponding to the network device.

In a cellular communication system, a UE with a smaller maximum output power (or a UE with a smaller power class, or a UE with a lower power) is introduced, and since a network is already deployed, for a UE with a larger maximum output power (or a UE with a larger power class, or a UE with a higher power), full coverage of uplink signals and downlink signals thereof can be ensured, but for a UE with a lower power, due to a limited maximum output power, a coverage area of downlink signals where the UE can reside is reduced, and in some areas among a plurality of network devices, such a UE cannot normally communicate. For such a UE with lower power, it may normally receive a downlink signal sent by the network device, but when performing cell selection, since it is limited by the maximum output power, that is, the uplink transmission power is limited, the coverage area of selecting a cell for normal communication may become smaller. With the introduction of the uplink coverage enhancement technology, the performance of uplink transmission can be improved, and further, the uplink coverage of the UE with lower power can be improved. However, in the prior art, the cell selection criterion limits the cell selection of the UE with lower power, i.e. the UE cannot select the cell in the coverage area where downlink communication is possible but uplink communication is not possible, so that even if the uplink coverage enhancement technique is introduced, the UE cannot perform normal communication in the coverage area since the UE does not select a cell in the coverage area.

Disclosure of Invention

The application provides a method, a system and a device for cell selection. The network device may configure power parameters corresponding to power classes for UEs of different power classes. In one aspect, by configuring the corresponding power parameter, UEs with different power classes can have the same cell selection threshold, i.e., cell selection is performed fairly. The cell selection can be easily performed without the difference of difficulty in cell selection due to different power levels of different UEs, that is, the UE with higher power has a larger signal coverage area and can select the cell without being close to the network device, which can be called as the UE with easier cell selection, while the UE with lower power has a smaller signal coverage area and can select the cell without being close to the network device, which can be called as the UE with difficulty in cell selection. On the other hand, since UEs of different power classes have different uplink powers, their uplink transmissions may require different numbers of repetitions when transmitting the same content. For example, the UE with smaller power needs to repeat the transmission for a plurality of times, so that the UE uses a plurality of uplink resources, and for this reason, the first network device may configure respective power parameters for the UEs with different power classes, so that the UEs with different power classes have a difficulty in selecting a cell.

In a first aspect, a method for cell selection is provided, where the method includes: the method comprises the steps that User Equipment (UE) receives first power information corresponding to a first cell from first network equipment, wherein the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer larger than 1, and M is smaller than or equal to N; the UE determines whether to select the first cell according to the first power information.

According to the embodiment of the present application, a first network device may configure first power parameters corresponding to power classes of UEs of different power classes, and on one hand, by configuring corresponding first power parameters, it may be implemented that the UEs of different power classes may have the same cell selection threshold, that is, perform cell selection fairly, and there is no difference that it is difficult to select a cell due to different power classes of different UEs, that is, a higher-power UE has a larger signal coverage of its cell, and can select the cell without being very close to the network device, which may be referred to as easier selection of the cell, and a lower-power UE has a smaller signal coverage of its cell, and can select the cell without being close to the network device, which may be referred to as not easy selection of the cell. On the other hand, since UEs of different power classes have different uplink powers, when the same content is transmitted, different numbers of repetitions may be required for uplink transmission, for example, a UE with a smaller power needs to repeat transmission more times, so that there are more uplink resources used by such UEs, and for this reason, the first network device may configure respective first power parameters for the UEs of different power classes, so that the UEs of different power classes have a difficulty in selecting a cell.

An alternative design, in which the UE determines whether to select the first cell according to the first power information, includes: and the UE determines whether to select the first cell according to the ith first power parameter in the M first power parameters indicated by the first power information, wherein the ith first power parameter corresponds to the first power level in the N power levels, and the first power level is the power level of the UE.

According to the embodiment of the present application, a plurality of power levels in the N power levels may correspond to one first power parameter, or the N power levels may correspond to M first power parameters one to one, where M is equal to N. The first network device may configure respective first power parameters for UEs of different power classes such that the UEs of different power classes have a difficulty in selecting a cell.

In an alternative design, the ith first power parameter is a maximum output power P allowed to be used by the UE by the first network device corresponding to the first power class_EMAXiOr the ith first power parameter is a power offset P corresponding to the first power level_offsetiI belongs to {1, M }.

An alternative design, in which the UE determines whether to select the first cell according to the first power information, includes: the UE determines a cell selection reception level value S according to the first power information_rxlevWhether a first criterion is met to determine whether to select a first cell; wherein S is_rxlevIs based on the power compensation value P_compensationAnd (4) obtaining the product.

An alternative design, P_compensation＝max(P_EMAXi–P_PowerClass0), wherein P_PowerClassMaximum output power for the UE; or, P_compensation＝max(P_EMAX–(P_PowerClass–P_offseti) 0), or, P_compensation＝max(P_EMAX+P_offseti0), wherein P_EMAXA maximum output power allowed for the UE for the first network device.

According to the embodiment of the present application, the first network device may determine whether to select the first cell according to the calculation method in the embodiment of the present application by configuring corresponding first power parameters for UEs of different power classes.

An alternative design is that the UE is a UE of mass machine type communication mMTC, orThe UE supporting uplink coverage enhancement, or lower power, e.g. P for the UE_PowerClassLess than 23 decibel milliwatts (dBm).

According to the embodiment of the application, the first network device may configure the first power parameter corresponding to the power class for the UEs with different power classes, and by configuring the corresponding first power parameter, the UEs with different power classes may have the same cell selection threshold, that is, the cell selection may be performed fairly, and there is no difference that it is difficult to select the cell due to different power classes of different UEs.

An optional design, the method further comprising: the UE receives first information sent by first network equipment, wherein the first information is used for indicating the corresponding relation between the M first power parameters and the N power levels.

In a second aspect, a method for cell selection is provided, the method comprising: the first network equipment sends first power information corresponding to a first cell to the UE, wherein the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer larger than 1, and M is smaller than or equal to N.

An optional design, the method further comprising: the first network equipment sends first information to the UE, wherein the first information is used for indicating the corresponding relation between the M first power parameters and the N power levels.

In a third aspect, a communication apparatus is provided, which includes: a receiving module, configured to receive first power information corresponding to a first cell from a first network device, where the first power information includes M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N; and the processing module is used for determining whether to select the first cell according to the first power information.

In an alternative design, the processing module is configured to determine whether to select the first cell based on the first power information, and includes: the processing module determines whether to select the first cell according to an ith first power parameter of the M first power parameters indicated by the first power information, wherein the ith first power parameter corresponds to a first power class of the N power classes, and the first power class is a power class of the UE.

With reference to the third aspect, in some implementations of the third aspect, the determining, by the processing module, whether to select the first cell according to the first power information includes: the processing module determines a cell selection reception level value S according to the first power information_rxlevWhether a first criterion is met to determine whether to select a first cell; wherein S is_rxlevIs based on the power compensation value P_compensationAnd (4) obtaining the product.

In an alternative design, the communication device is a mass machine type communication mtc communication device, or the communication device supports uplink coverage enhancement, or a lower power communication device, such as a P-communication device of the communication device_PowerClassLess than 23 dBm.

In an optional design, the receiving module is further configured to receive first information sent from the first network device, where the first information is used to indicate a correspondence between the M first power parameters and the N power levels.

In a fourth aspect, a communication apparatus is provided, the communication apparatus comprising: a sending module, configured to send first power information corresponding to the first cell to the UE, where the first power information includes M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N.

In an optional design, the sending module is further configured to send first information to the UE, where the first information is used to indicate a correspondence between the M first power parameters and the N power levels.

In a fifth aspect, a network system is provided, which comprises at least one communication apparatus of the third aspect and at least one communication apparatus of the fourth aspect.

In a sixth aspect, another method for cell selection is provided, the method comprising: the UE receives second power information corresponding to the first cell from the first network device, the second power information including a second power parameter, which may be a maximum output power P determined according to a power class of the UE_PowerClass1Or the maximum output power P allowed by the network equipment to be used by the UE_EMAX1And the UE determines whether to select the first cell according to the second power information.

An alternative design, in which the UE determines whether to select the first cell according to the first power information, includes: the UE determines a cell selection reception level value S according to the second power information_rxlevWhether a first criterion is met to determine whether to select a first cell; wherein S is_rxlevIs based on the power compensation value P_compensationAnd (4) obtaining the product.

An alternative design, P_compensation＝max(P_EMAX–P_PowerClass10), wherein P_EMAXMaximum output power, P, allowed for the UE to be used by the first network device_PowerClass1May be a positive integer.

An alternative design, P_compensation＝max(P_EMAX+P_PowerClass10), wherein P_EMAXMaximum output power, P, allowed for the UE to be used by the first network device_PowerClass1May be a positive integer.

An alternative design, P_compensation＝max(P_EMAX1–P_PowerClass0), wherein P_PowerClassIs the maximum output power, P, of the UE_EMAX1May be a positive integer.

In an alternative design, the first and second parts of the device,P_compensation＝max(P_EMAX1+P_PowerClass0), wherein P_PowerClassIs the maximum output power, P, of the UE_EMAX1May be a positive integer.

In an alternative design, the UE is a mtc UE, or the UE supports uplink coverage enhancement, or a UE with lower power, such as a P of the UE_PowerClassLess than 23 dBm.

In a seventh aspect, a method for cell selection is provided, where the method includes: the first network device sends second power information corresponding to the first cell to the UE, where the second power information includes a second power parameter, and the second power parameter may be a maximum output power P determined according to a power class of the UE_PowerClass1Or the maximum output power P allowed by the network equipment to be used by the UE_EMAX1。

In an eighth aspect, a communication device is provided, which may perform any one of the methods of the fifth aspect.

In a ninth aspect, there is provided a communication device that can perform any one of the methods of the sixth aspect.

In a tenth aspect, there is provided a method of cell selection, the method comprising: the first network equipment sends second information to the UE, wherein the second information comprises a first random access preamble and/or a first time-frequency resource; a first network device receives a first random access preamble from a UE; the first network equipment sends a first random access response message to the UE; the method comprises the steps that first network equipment receives a first message from UE, and the first message is used for requesting to establish or recover RRC connection; the first network device sends an RRC connection setup message or an RRC connection resume message to the UE for establishing or resuming the RRC connection.

In an alternative design, the first random access preamble and/or the first time-frequency resource are used for a UE of mtc and/or a UE supporting uplink coverage enhancement and/or a lower power UE.

In an alternative design, the second information may further include a first partial Bandwidth (BWP), and the first BWP may be used to indicate Bandwidth information for the UE to receive the first random access response message.

In an alternative design, the first random access response message includes an R bit, and when R is 1, the first random access response message is used to indicate a number of repetitions of the UE sending the first message.

In an eleventh aspect, there is provided another cell selection method, including: the UE receives second information from the first network equipment, wherein the second information comprises a first random access lead code and/or a first time-frequency resource, and the UE sends the first random access lead code to the first network equipment; the UE receives a first random access response message from the first network equipment; the UE sends a first message to the first network equipment, wherein the first message is used for requesting to establish or recover RRC connection; the UE receives an RRC connection setup message or an RRC connection resume message from the first network device for establishing or resuming the RRC connection.

In an alternative design, the second information may further include a first BWP, and the first BWP may be used to indicate bandwidth information for the UE to receive the first random access response message.

In a twelfth aspect, there is provided a communication device that can perform any one of the methods of the eleventh aspect.

In a thirteenth aspect, there is provided a communication device that can perform any one of the methods of the tenth aspect.

In a fourteenth aspect, a communication apparatus is provided, which includes: the communication device comprises at least one processor, at least one memory and a communication interface, wherein the communication interface is used for information interaction between the communication device and other communication devices, the memory is used for storing first power information corresponding to a first cell from first network equipment, the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N; when the program instructions are executed in the at least one processor, the processor may determine whether to select the first cell based on the first power information.

In a fifteenth aspect, a communication device is provided, comprising: the communication interface is used for information interaction between the communication device and other communication devices, the memory is used for storing first power information, the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is smaller than or equal to N; the program instructions, when executed in the at least one processor, cause the communication device to perform the above method.

In a sixteenth aspect, a chip is provided, the chip comprising: at least one processor and a communication interface for the communication device to interact with other communication devices, the program instructions when executed in the at least one processor causing the method above to be performed.

In a seventeenth aspect, a computer-readable storage medium is provided, having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the above aspects.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system suitable for use in embodiments of the present application.

Fig. 2 is a diagram illustrating coverage of UEs of different power classes in the same cell.

Fig. 3 is a schematic diagram of coverage of UEs of different power classes.

Fig. 4 is a schematic flowchart of a method for cell selection according to an embodiment of the present application.

Fig. 5 is a schematic interaction diagram of a method for cell selection according to an embodiment of the present application.

Fig. 6 is a schematic flow chart of another method for cell selection according to an embodiment of the present application.

Fig. 7 is a schematic interaction diagram of a method for cell selection according to an embodiment of the present application.

Fig. 8 is a schematic interaction diagram of a UE establishing a connection with a first cell according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a format of a first random access response message provided in an embodiment of the present application.

Fig. 10 is a schematic configuration diagram of a communication apparatus according to an embodiment of the present application.

Fig. 11 is a schematic configuration diagram of a communication apparatus according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a communication device according to an embodiment of the present application.

Fig. 13 is a schematic diagram of a communication device according to an embodiment of the present application.

Detailed Description

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

Fig. 1 is a schematic architecture diagram of a mobile communication system suitable for use in the embodiments of the present application.

As shown in fig. 1, the mobile communication system 100 may include at least one network device 101 and at least one UE 102. Fig. 1 is a schematic diagram, and other network devices, such as a wireless relay device and a wireless backhaul device, may also be included in the communication system, which are not shown in fig. 1. The embodiments of the present application do not limit the number and specific types of network devices and UEs included in the mobile communication system.

The UE102 in the embodiments of the present application may refer to an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The user equipment 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 user equipment in a 5G network or a user equipment in a Public Land Mobile Network (PLMN) for future evolution, a user equipment in a 6G network and a user equipment in a 7G network for future evolution, and the like, which are not limited in this embodiment.

The network device 101 in this embodiment may be a device for communicating with a user equipment, and the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, a network device (nodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, an evolved network device (e-nodeB, eNB, or eNodeB) in an LTE system, a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or a relay station, an access point, a vehicle-mounted device, a wearable device, a network device (nodeB, or G) in a 5G network, or a network device in a future network such as a PLMN, a nodeB, or G7 in a future network, or a PLMN G network, the embodiments of the present application are not limited.

Optionally, the communication method of the present application may also be extended to various communication systems, such as a GSM system, a CDMA system, a WCDMA system, a General Packet Radio Service (GPRS), an LTE system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a 5G system, or a New Radio (NR).

When selecting a cell, the UE typically applies S-criteria to determine whether a cell is a suitable cell, where S-criteria are:

S_rxlev>0, and S_qual>0，

Wherein the content of the first and second substances,

S_rxlev＝Q_rxlevmeas–(Q_rxlevmin+Q_{rxlevminoffset})–P_compensation–Q_offsettemp，

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Q_offsettemp。

wherein the content of the first and second substances,

Q_rxlevmeasa measured cell RX level value (RSRP) for a measured cell received level value (reference signal received power);

Q_rxlevmina minimum required RX level in the cell;

Q_{rxlevminoffset}is Q_rxlevminThe offset of (2);

P_compensationis max (P)_EMAX–P_PowerClass,，0)，P_EMAXMaximum output power (maximum TX power level of UE may use transmitting on the uplink in the cell), P, allowed by the network device_PowerClassIs the maximum output power (maximum output power) determined according to the power class of the UE, wherein P_PowerClassFor the transmitting capability of the UE itself, i.e. the maximum output power, P, determined by the UE according to the power class_EMAXA maximum output power allowed for the UE for the network device;

Q_offsettempis an offset temporary applied to a cell;

Q_qualmeasmeasured cell quality value (reference signal received quality) (RSRQ)) for a measured cell;

Q_qualmina minimum required quality level in the cell;

Q_{qualminoffset}is Q_qualminThe amount of offset of (c).

In a simplest case, e.g. Q_{rxlevminoffset}、P_compensation、Q_offsettemp、Q_{qualminoffset}、Q_offsettempAre all zero, and the total number of the active carbon particles is zero,then S_rxlev>0 and S_qual>0, equivalent to Q_rxlevmeas>Q_rxlevminAnd Q_qualmeas>Q_qualminI.e. the RSRP value and RSRQ value measured by the terminal are greater than the required minimum receive level value and the required minimum signal quality value.

Current communication systems support UEs of different power classes, i.e. different UEs may have different maximum output powers, e.g. 23dBm, 26 dBm. From the perspective of the UE, different power levels correspond to different uplink coverage ranges, in other words, on the premise that the network device can receive/decode uplink data transmitted by the UE, the UE with larger output power may be farther from the network device. Thus, at S_rxlevIn the formula (1), P is introduced_compensationParameter, maximum output power P available for UE when indicated by network equipment_EMAXGreater than P_PowerClassWhen is, P_compensation＝P_EMAX–P_PowerClassFirst, without considering Q_{rxlevminoffset}、Q_offsettempThen S is_rxlev＝Q_rxlevmeas–Q_rxlevmin–P_compensationDue to P_compensationGreater than 0, so Q is required_rxlevmeasLarger, i.e. the UE needs to be closer to the network device. P_EMAXThe parameter is a parameter that the network device sends to the UE through the system message, and is a maximum output power that the network device allows the UE to use, and its value is generally not changed, and different UEs may have different P_PowerClass，P_PowerClassThe smaller, P_compensationThe larger, if S is required_rxlevAbove 0, Q is required_rxlevmeasThe larger, i.e. the closer the UE needs to be to the network device, it can be understood that the downlink coverage of the UE becomes smaller. The farther away from the network device, Q_rxlevmeasThe smaller the size, the inability to satisfy Srxlev greater than 0, the UE may not be able to select to that cell.

As shown in fig. 2, under the coverage of the same network device 201, by Q_rxlevminThe determined downlink coverage may be represented by 206 in fig. 2, i.e., satisfying Q_rxlevmeas>Q_rxlevminCoverage, P of UE202_PowerClassP smaller than UE203_PowerClassIf the uplink coverage of the UE202 is smaller than the uplink coverage of the UE203, in order to enable the UE202 to normally communicate with the network device 201, the downlink coverage 204 of the UE202 should also be smaller than the downlink coverage 205 of the UE203, that is, the network device 201 has different downlink coverage for UEs with different power levels, that is, the UE202 can normally communicate within the range of 204, and the UE203 can normally communicate within the range of 205.

In future communication systems, a UE with lower power is introduced, since the network device is already deployed, the UE with higher power can guarantee full coverage of its signal, but for a UE with lower power, because its uplink power is limited, the coverage area where it can camp is reduced, as shown in fig. 3, each first area 301 (i.e. area a, indicated by the upper diagonal line) in fig. 3 can be regarded as the downlink coverage area of one cell, an existing UE or a UE with higher power determines that the corresponding cell is a cell suitable for camping in the first area 301, and if a UE is not in any first area 301, the UE determines that it is not in the service area of the wireless network; accordingly, each second area 302 (i.e., area B, indicated by the lower diagonal line) may be considered a downlink coverage area for one cell of lower power UEs, which may be determined not to be within the service area of the wireless network if one lower power UE is not within any of the second areas 302. In fig. 3, the diamond-shaped area is an overlapping area of the area a and the area B. As can be seen from fig. 3, for existing UEs or UEs with higher power, the areas that can be selected by the cells are consecutive (i.e. there is no area between the first areas 301 in fig. 3 that is not covered by the first areas 301), while for UEs with lower power, there is an area between the second areas 302 that is not covered by the first areas 302, so that the UEs with lower power have no cells between the second areas 302 that can be selected, i.e. no cell can be found to satisfy the S criterion, i.e. the second areas 302 are not consecutive, so that for the UEs with lower power, the signal coverage is no longer consecutive, and in some areas, such UEs cannot communicate normally.

For such a UE with lower power, considering that it is affected by uplink transmit power rather than downlink receive power when performing cell selection, that is, the UE may receive downlink data sent by the network device, if an uplink enhancement technique is introduced to improve the performance of uplink transmission, the coverage of the UE with lower power may be improved. Thus, one problem to be solved is how to implement a lower power UE to select a suitable cell at the cell edge, e.g., outside the second area 302 in fig. 3.

The application provides a method for selecting a cell, which enables a UE with lower power to select a cell in a larger range, so that the cell has a signal coverage range for connection.

Fig. 4 is a schematic flow chart of a method for cell selection provided in an embodiment of the present application, where the method of fig. 4 may be performed by the UE102 of fig. 1.

S401, the UE receives first power information corresponding to a first cell from a first network device, where the first power information may include M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N.

Wherein the power class defines a maximum output power of the UE, and the UE may determine the maximum output power according to the power class.

For example, the correspondence of power class to maximum output power is given in the third generation partnership project (3 GPP) TS 38.101-1-g 00, as shown in table 1:

TABLE 1

It should be understood that there may be multiple power levels in the N power levels corresponding to the same first power parameter, or that the N power levels may correspond to M first power parameters one-to-one, in which case M is equal to N.

Optionally, the first power information may carry a correspondence between the M first power parameters and the N power classes, or the UE may receive first information sent by the first network device, where the first information may be used to indicate a correspondence between the M first power parameters and the N power classes.

Optionally, the UE may determine whether to select the first cell according to an ith first power parameter of the M first power parameters indicated by the first power information. Wherein, the ith first power parameter in the M first power parameters corresponds to a first power class in the N power classes, and the first power class is a power class of the UE.

Optionally, the corresponding relationship between the ith first power parameter and the first power level may be indicated by the first power information, or may also be indicated by the first information received by the UE.

Optionally, the ith first power parameter is a maximum output power P allowed to be used by the UE by the first network device corresponding to the first power class_EMAXiOr the ith first power parameter is the power offset P_offsetiI belongs to {1, M }.

It should be understood that when the first power parameter is P_EMAXiThen, it can be understood that the network device reconfigures the maximum output power allowed to be used by the UE for the UE.

Optionally, the first power information may be included in a system message sent by the first network device, for example, the M first power parameters may be included in a system information block 1(system information block type1, SIB 1).

Optionally, the values of the M first power parameters are positive integers.

S402, the UE determines whether to select the first cell according to the first power information.

Optionally, the UE determining whether to select the first cell according to the first power information may include: the UE determines S according to the first power information_rxlevWhether a first criterion is met to determine whether to select the first cell, wherein the S_rxlevIs based on P_compensationAnd (4) obtaining the product. Wherein, the first criterion may be an S criterion, S, in cell selection_rxlevCan root upThe calculation is made according to the following formula:

S_rxlev＝Q_rxlevmeas–(Q_rxlevmin+Q_{rxlevminoffset})–P_compensation–Q_offsettemp。

optionally, when the UE determines whether to select the first cell according to the S criterion, S may also be determined_qual，S_qualThe calculation can be made according to the following formula:

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Q_offsettemp，

when S is_rxlev>0, and S_qual>0, the UE may select the first cell.

Optionally, the UE may determine P according to the first power information_compensation。

Alternatively, the first power parameter may be that the first power parameter corresponding to the first power level is P_EMAXiOr the first power parameter may be that the first power parameter corresponding to the first power level is P_offseti。

Alternatively, if the UE is a massive machine type of communication (mtc) UE, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, such as a P of the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_EMAXiWhen it is, then P_compensation＝max(P_EMAXi–P_PowerClass,0)，P_EMAXiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_EMAXiWhen it is, then P_compensation＝max(P_EMAXi+P_PowerClass,0)，P_EMAXiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_offsetiWhen it is, then P_compensation＝max(P_EMAX–(P_PowerClass–P_offseti),0)，P_offsetiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

The first network device may configure P corresponding to its power class for UEs of different power classes_EMAXiReconfiguring the maximum output power allowed by the network equipment to the UE, on the one hand, by configuring the corresponding P_EMAXiThe UE with different power classes can have the same cell selection threshold, that is, perform cell selection fairly, and there is no difference that it is difficult to select a cell due to different power classes of different UEs, that is, the UE with higher power has a larger signal coverage area of the cell, and can select the cell without being very close to the network device, which can be called as selecting the cell easily, while the UE with lower power has a smaller signal coverage area of the cell, and needs to be close to the network device to select the cell, which can be called as selecting the cell difficultly. On the other hand, since UEs with different power classes have different uplink powers, uplink transmission may require different numbers of repetitions when transmitting the same content, for example, UEs with smaller power need more repetitions, and thus, such UEs use more uplink resources, and for this reason, the first network device may configure respective P for UEs with different power classes_EMAXiThe UEs with different power levels are allowed to have a difficulty in selecting cells, which is fair from the network resource perspective, because the UEs occupy more resources, the network can control the UEs to make it difficult to select one cell, so as to reduce the excessive consumption of system resources.

Alternatively, ifThe UE is a mMTC UE, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., a P for the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_offsetiWhen it is, then P_compensation＝max(P_EMAX–(P_PowerClass+P_offseti),0)，P_offsetiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_offsetiWhen it is, then P_compensation＝max(P_EMAX–P_offseti,0)，P_offsetiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_offsetiWhen it is, then P_compensation＝max(P_EMAX+P_offseti,0)，P_offsetiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

The first network device may configure P corresponding to its power class for UEs of different power classes_offsetiOn the one hand, by configuring the corresponding P_offsetiThe UE with different power classes can have the same cell selection threshold, i.e. cell selection is performed fairly, and there is no difference that it is difficult to select a cell due to different power classes of different UEs, i.e. the UE with higher power has larger signal coverage of the cell, and can select the cell without being very close to the network device, which can be called as easier selection of the cellThe UE with lower power may have a smaller signal coverage of a cell, and need to be closer to the network device to select the cell, which may be referred to as not easy to select the cell. On the other hand, since UEs with different power classes have different uplink powers, uplink transmission may require different numbers of repetitions when transmitting the same content, for example, UEs with smaller power need more repetitions, and thus, such UEs use more uplink resources, and for this reason, the first network device may configure respective P for UEs with different power classes_offsetiThe UEs with different power levels are allowed to have a difficulty in selecting cells, which is fair from the network resource perspective, because the UEs occupy more resources, the network can control the UEs to make it difficult to select one cell, so as to reduce the excessive consumption of system resources.

Optionally, when the UE is a UE in mtc or a low-cost and low-complexity UE, the UE may have at least one of the following features:

(1) the maximum bandwidth supported by the UE is 5 MHz;

(2) the UE is provided with a radio frequency channel or a radiation antenna;

(3) the UE has a reduced peak rate;

(4) the UE supports half-duplex FDD;

(5) the maximum transmission block size transmitted by the UE is 1000 bits;

(6) the maximum output power of the UE is less than 23 dBm;

(7) the UE supports uplink coverage enhancement;

(8) the highest modulation mode supported by the UE is 16 QAM.

Optionally, the UE supports uplink coverage enhancement, which may refer to at least one of the following:

(1) the UE supports bundling of uplink transmission;

(2) UE supports binding of uplink transmission in a random access process;

(3) the UE supports repeated transmission (retransmission) of uplink transmissions.

Optionally, P of the UE_PowerClassLess than 23dBm, may refer to at least one of:

(1) p of UE_PowerClassMay be 20dBm or 17dBm or 14dBm or 11 dBm;

(2) p of UE_PowerClassIs X1, where X1 may be 20dBm or 17dBm or 14dBm or 11dBm, the UE may choose to use P_PowerClassWork for X2, where X2 is less than X1.

Fig. 5 is a schematic interaction diagram of a method for cell selection according to an embodiment of the present application, where the method of fig. 5 may be performed by the network device 101 and the UE102 of fig. 1.

S501, a first network device may send first power information corresponding to a first cell to a UE, where the first power information may include M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N.

It should be understood that there may be multiple power levels in the N power levels corresponding to one first power parameter, or that the N power levels may correspond to M first power parameters one-to-one, in which case M is equal to N.

Optionally, the first power information may carry a correspondence between the M first power parameters and the N power classes, or the first network device may send the first information to the UE, where the first information may be used to indicate a correspondence between the M first power parameters and the N power classes.

Optionally, the UE may determine whether to select the first cell according to an ith first power parameter of the M first power parameters indicated by the first power information, where the ith first power parameter corresponds to a first power class of the N power classes, and the first power class is a power class of the UE.

Optionally, the ith first power parameter is allowed for the first network device corresponding to the first power classMaximum output power P allowed for UE_EMAXiOr the ith first power parameter is a power offset P corresponding to the first power level_offsetiI belongs to {1, M }.

Optionally, the first power information may be included in a system message sent by the first network device, for example, the M first power parameters may be included in the SIB1 in the system message.

Optionally, values of the M first power parameters are all positive integers.

S502, the UE determines whether to select the first cell according to the first power information.

Optionally, the UE determining whether to select the first cell according to the first power information may include: the UE determines S according to the first power information_rxlevWhether a first criterion is met to determine whether to select the first cell, wherein the S_rxlevIs based on P_compensationAnd (4) obtaining the product. Wherein the first criterion may be an S criterion in cell selection, and S is_rxlevThen the calculation can be made according to the following formula:

optionally, when the UE determines whether to select the first cell according to the S criterion, S may also be determined_qualAnd S is_qualThe calculation can be made according to the following formula:

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Q_offsettemp，

when S is_rxlev>0, and S_qual>0, the UE may select the first cell.

Optionally, if the UE is a mtc UE, and/or the UE supports uplink coverageCover enhancement, and/or lower power UEs, e.g., P for UEs_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_EMAXiWhen it is, then P_compensation＝max(P_EMAXi–P_PowerClass,0)，P_EMAXiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the first power parameter corresponding to the first power level in the first power information is P_offsetiWhen it is, then P_compensation＝max(P_EMAX–(P_PowerClass+P_offseti),0)，P_offsetiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm and corresponding in the first power informationThe first power parameter at the first power level is P_offsetiWhen it is, then P_compensation＝max(P_EMAX+P_offseti,0)，P_offsetiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

The first network device may configure P corresponding to its power class for UEs of different power classes_offsetiOn the one hand, by configuring the corresponding P_offsetiThe UE with different power levels can have the same cell selection threshold, namely, the cell selection is performed fairly, and the difficult difference of cell selection caused by different power levels of different UE is avoided. On the other hand, since UEs with different power classes have different uplink powers, uplink transmission may require different numbers of repetitions when transmitting the same content, for example, UEs with smaller power need more repetitions, and thus, such UEs use more uplink resources, and for this reason, the first network device may configure respective P for UEs with different power classes_offsetiThe UEs with different power levels are allowed to have a difficulty in selecting cells, which is fair from the network resource perspective, because the UEs occupy more resources, the network can control the UEs to make it difficult to select one cell, so as to reduce the excessive consumption of system resources.

S503, the UE may establish a connection with the first cell.

(1) the maximum bandwidth supported by the UE is 5 MHz;

(2) the UE is provided with a radio frequency channel or a radiation antenna;

(3) the UE has a reduced peak rate;

(4) the UE supports half-duplex FDD;

(5) the maximum transmission block size transmitted by the UE is 1000 bits;

(6) the maximum output power of the UE is less than 23 dBm;

(7) the UE supports uplink coverage enhancement;

(8) the highest modulation mode supported by the UE is 16 QAM.

(1) UE supports binding of uplink transmission;

(2) UE supports binding of uplink transmission in a random access process;

(3) the UE supports repeated transmission of uplink transmissions.

(1) p of UE_PowerClassMay be 20dBm or 17dBm or 14dBm or 11 dBm;

Alternatively, when S_rxlev>0, and S_qual>0, the UE may select a first cell to establish a communication connection with the first network device.

Fig. 6 is a schematic flow chart of another method for cell selection provided in an embodiment of the present application, where the method of fig. 6 may be performed by UE102 of fig. 1.

S601, the UE receives second power information corresponding to the first cell from the first network device, where the second power information may include a second power parameter, and the number of the second power parameters may be one.

Alternatively, the second power parameter may be a maximum output power P determined according to a power class of the UE_PowerClass1Or the maximum output power P allowed by the first network device to be used by the UE_EMAX1。

Optionally, the second power information may be a system message sent by the first network device, or may be a part of a system message sent by the first network device, and the second power parameter included in the system message may be located in the SIB 1.

Alternatively, the second power parameter may be a positive integer.

S602, the UE determines whether to select the first cell according to the second power information.

Optionally, the UE determining whether to select the first cell according to the second power information may include: the UE determines S according to the second power information_rxlevWhether a first criterion is met to determine whether to select the first cell, wherein the S_rxlevIs based on P_compensationAnd (4) obtaining the product. Wherein, the first criterion may be an S criterion, S, in cell selection_rxlevThen the calculation can be made according to the following formula:

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Q_offsettemp，

when S is_rxlev>0, and S_qual>0, the UE may select the first cell.

Optionally, the UE may determine P according to the second power information_compensation。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the second power parameter in the second power information is P_PowerClass1When it is, then P_compensation＝max(P_EMAX–P_PowerClass1,0)，P_PowerClass1May be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the second power parameter in the second power information is P_PowerClass1When it is, then P_compensation＝max(P_EMAX+P_PowerClass1,0)，P_PowerClass1May be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the second power parameter in the second power information is P_EMAX1When it is, then P_compensation＝max(P_EMAX1–P_PowerClass,0)，P_EMAX1May be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX1–P_PowerClass,0)。

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the second power parameter in the second power information is P_EMAX1When it is, then P_compensation＝max(P_EMAX1+P_PowerClass,0)，P_EMAX1May be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

The first network device may configure the same power parameter for the UEs of different power classes, so that all the UEs in the first cell use the same power parameter, and the UEs of different power classes may have the same uplink coverage, so that the UEs of different power classes have fairness when selecting the cell to camp on.

(1) the maximum bandwidth supported by the UE is 5 MHz;

(2) the UE is provided with a radio frequency channel or a radiation antenna;

(3) the UE has a reduced peak rate;

(4) the UE supports half-duplex FDD;

(5) the maximum transmission block size transmitted by the UE is 1000 bits;

(6) the maximum output power of the UE is less than 23 dBm;

(7) the UE supports uplink coverage enhancement;

(8) the highest modulation mode supported by the UE is 16 QAM.

(1) UE supports binding of uplink transmission;

(2) UE supports binding of uplink transmission in a random access process;

(3) the UE supports repeated transmission of uplink transmissions.

(1) p of UE_PowerClassMay be 20dBm or 17dBm or 14dBm or 11 dBm;

Fig. 7 is a schematic interaction diagram of a method for cell selection according to an embodiment of the present application, where the method of fig. 7 may be performed by the network device 101 and the UE102 of fig. 1.

S701, the first network device sends, to the UE, second power information corresponding to the first cell, where the second power information may include a second power parameter, and the number of the second power parameters may be one.

Alternatively, the second power parameter may be a maximum output power P determined according to a power class of the UE_PowerClass1Or the maximum output power P allowed by the network equipment to be used by the UE_EMAX1。

Optionally, the second power information may be a system message sent by the first network device, or may be a system message included in the first network device, and the included power parameter may be located in the SIB1 in the system message.

Alternatively, the second power parameter may be a positive integer.

S702, the UE determines whether to select the first cell according to the second power information.

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Q_offsettemp，

when S is_rxlev>0, and S_qual>0, the UE may select the first cell.

Optionally, if the UE is a UE of mMTC, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g., P for the UE_PowerClassLess than 23dBm, and the second power parameter in the second power information is P_EMAX1When it is, then P_compensation＝max(P_EMAX1+P_PowerClass,0)，P_EMAXiMay be a positive integer. If the above condition is not satisfied, P_compensation＝max(P_EMAX–P_PowerClass,0)。

S703, the UE may establish a connection with the first cell.

(1) the maximum bandwidth supported by the UE is 5 MHz;

(2) the UE is provided with a radio frequency channel or a radiation antenna;

(3) the UE has a reduced peak rate;

(4) the UE supports half-duplex FDD;

(5) the maximum transmission block size transmitted by the UE is 1000 bits;

(6) the maximum output power of the UE is less than 23 dBm;

(7) the UE supports uplink coverage enhancement;

(8) the highest modulation mode supported by the UE is 16 QAM.

(1) UE supports binding of uplink transmission;

(2) UE supports binding of uplink transmission in a random access process;

(3) the UE supports repeated transmission of uplink transmissions.

(1) p of UE_PowerClassMay be 20dBm or 17dBm or 14dBm or 11 dBm;

It should be understood that this is only one method for establishing a connection between the UE and the cell for communication, and the present application is not limited thereto.

S801, the UE determines whether to select a first cell.

The UE may determine whether to select the first cell according to the first power information or the second power information, and the UE may determine P according to a power parameter in the first power information or the second power information_compensationThen according to P_compensationDetermination of S_rxlevAt the same time, S can also be determined_qualThe determination method is as follows:

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Q_offsettemp。

if S_rxlev>0 and S_qual>0, the UE selects the cell, and can establish a communication connection with the cell.

The power parameter may be a first power parameter in the first power information, or may be a second power parameter in the second power information.

The first network device may send second information to the UE, which may include the first random access preamble and/or the first time-frequency resource S802.

Optionally, the first random access preamble and/or the first time-frequency resource are used for UEs of mtc, and/or UEs supporting uplink coverage enhancement, and/or lower power UEs, such as P of UE_PowerClassLess than 23 dBm.

Alternatively, the second information may be system information, and the second information may also be a part included in the system information.

Optionally, the second information may further include a first BWP, and the first BWP may be used to instruct the UE to receive bandwidth information of the first random access response message.

S803, the UE sends the first random access preamble to the first network device according to the first time-frequency resource.

Optionally, the UE is an mtc UE, and/or the UE supports uplink coverage enhancement, and/or a lower power UE, e.g. a P of the UE_PowerClassLess than 23 dBm.

S804, the first network device sends a first random access response message to the UE, where the first random access response message may indicate the number of times that the UE sends the first message.

The format of the first random access response message is as shown in fig. 9, where the first random access response message includes an R bit, and if R ═ 1, the first random access response message may be used to indicate the number of times that the UE transmits the first message.

Optionally, the first random access response message may include uplink resource Grant information (UL Grant), the content of which is shown in table 2 below.

TABLE 2

If R ═ 1, X bits in the random access response grant field are used to indicate the number of repetitions of the first message.

Alternatively, the X bits may be X-1 bits in the MCS and 1 bit in the CSI request.

Alternatively, the X bits may be X bits in the frequency domain resource allocation of the physical uplink shared channel.

Alternatively, if R ═ 1, then repeated transmission of the first message is indicated, and the number of times of repetition may be fixed Y times, for example, Y may be a positive integer such as 4, 8, and the like.

Optionally, the first random access response message includes a second BWP indicating a bandwidth for the UE to transmit the first message.

S805, the UE sends a first message to the first network device according to the UL grant, where the UL grant may be used to indicate the number of times the UE sends the first message.

Alternatively, the number of times of repeatedly transmitting the first message may be indicated by X bits in the UL grant, or may be a fixed number of times Y.

Alternatively, the first message may be a Radio Resource Control (RRC) connection setup request message.

S806, the first network device may send an RRC connection setup message or an RRC connection resume message to the UE, and then the UE enters an RRC connected state and may perform data transmission with the first network device.

As shown in fig. 10, the communication device may include a receiving module 1001 and a processing module 1002.

The receiving module 1001 may be configured to receive first power information corresponding to a first cell from a first network device, where the first power information includes M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N.

The processing module 1002 may be configured to determine whether to select the first cell based on the first power information.

Optionally, the processing module 1002 is configured to determine whether to select the first cell according to the first power information, and includes: the processing module 1002 determines whether to select the first cell according to an ith first power parameter of the M first power parameters indicated by the first power information, where the ith first power parameter corresponds to a first power class of the N power classes, and the first power class is a power class of the UE.

Optionally, the ith first power parameter is P corresponding to the first power level_EMAXiOr is P_offsetiI belongs to {1, M }.

Optionally, the processing module 1002 determines whether to select the first cell according to the first power information, including: the processing module 1002 determines S according to the first power information_rxlevWhether a first criterion is met to determine whether to select a first cell; wherein S is_rxlevIs based on P_compensationAnd (4) obtaining the product.

Alternatively, P_compensationCan be determined according to the following ways:

P_compensation＝max(P_EMAXi–P_PowerClass0), wherein P_PowerClassMaximum output power for the UE; alternatively, the first and second electrodes may be,

P_compensation＝max(P_EMAX–(P_PowerClass–P_offseti) 0), or, P_compensation＝max(P_EMAX+P_offseti0), wherein P_EMAXA maximum output power allowed for the UE for the first network device.

Alternatively, the communication device may be a communication device that is an mtc, and/or the communication device supports uplink coverage enhancement, and/or a lower power communication device, e.g. a P of communication devices_PowerClassLess than 23 dBm.

Optionally, the receiving module 1001 is further configured to receive first information sent from the first network device, where the first information is used to indicate a correspondence between the M first power levels and the N power levels.

As shown in fig. 11, the communication apparatus may include a transmitting module 1101.

The sending module 1101 may be configured to send first power information corresponding to a first cell, where the first power information includes M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N.

Optionally, the sending module 1101 may be further configured to send, to the UE, first information, where the first information is used to indicate a correspondence relationship between the M first power parameters and the N power classes.

In another implementation, a wireless communication apparatus is provided that may be configured to perform the steps of the above-described method flows. The wireless communication device comprises a processor and an interface circuit, and when the processor calls an instruction through the interface circuit, the steps in the flow of the method can be executed. The instructions may be stored in a storage medium. The storage medium storing the instructions may be a component of the wireless communication device or may be external to the wireless communication device. The wireless communication device may be a user equipment or a network device, or a chip device.

Fig. 12 shows a schematic structural diagram of a communication device according to an embodiment of the present application. For implementing the operation of the user equipment in the above embodiments.

As shown in fig. 12, the communication apparatus includes: antenna 810, radio frequency device 820, baseband device 830. Antenna 810 is coupled to radio 820. In the downlink direction, rf apparatus 820 receives information transmitted by the network device through antenna 810, and transmits the information transmitted by the network device to baseband apparatus 830 for processing. In the uplink direction, the baseband device 830 processes the information of the communication device and sends the information to the rf device 820, and the rf device 820 processes the information of the communication device and sends the processed information to the network device through the antenna 810.

The baseband apparatus 830 may include a modem subsystem for implementing processing of various communication protocol layers of data; the system also comprises a central processing subsystem used for realizing the processing of a terminal operating system and an application layer; in addition, other subsystems, such as a multimedia subsystem for enabling control of a communication device camera, screen display, etc., peripheral subsystems for enabling connection to other devices, and the like, may also be included. The modem subsystem may be a separate chip. Alternatively, the above means for the communication device may be located at the modem subsystem.

The modem subsystem may include one or more processing elements 831, including, for example, a host CPU and other integrated circuits. The modem subsystem may also include a storage element 832 and an interface circuit 833. The storage element 832 is used to store data and programs, but programs for performing the methods performed by the communication device in the above methods may not be stored in the storage element 832, but in a memory external to the modem subsystem. The interface circuit 833 is used to communicate with other subsystems. The above apparatus for a communication device may be located in a modem subsystem, which may be implemented by a chip comprising at least one processing element for performing the steps of any of the methods performed by the above communication device and interface circuitry for communicating with other devices. In one implementation, the unit of the communication device for implementing the steps of the above method may be implemented in the form of a processing element scheduler, for example, an apparatus for a communication device includes a processing element and a storage element, and the processing element calls a program stored in the storage element to execute the method executed by the terminal in the above method embodiment. The memory elements may be memory elements with the processing elements on the same chip, i.e. on-chip memory elements.

Fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application. For implementing the operation of the network device in the above embodiments.

As shown in fig. 13, the communication apparatus includes: antenna 901, radio frequency device 902, baseband device 903. The antenna 901 is connected to a radio frequency device 902. In the uplink direction, the rf apparatus 902 receives information transmitted by the terminal through the antenna 901, and transmits the information transmitted by the user equipment to the baseband apparatus 903 for processing. In the downlink direction, the baseband device 903 processes the information of the terminal and sends the information to the radio frequency device 902, and the radio frequency device 902 processes the information of the user equipment and sends the information to the terminal through the antenna 901.

The baseband device 903 may include one or more processing elements 9031, including, for example, a host CPU and other integrated circuits. In addition, the baseband device 903 may further include a storage element 9032 and an interface 9033, where the storage element 9032 is configured to store programs and data; the interface 9033 is used for exchanging information with the radio frequency device 902, and is, for example, a Common Public Radio Interface (CPRI). The above means for communication means may be located on the baseband means 903, for example, the above means for communication means may be a chip on the baseband means 903, the chip comprising at least one processing element for performing the steps of any of the methods performed by the above communication means and interface circuitry for communicating with other devices. In one implementation, the unit of the communication device for implementing the steps of the above method may be implemented in the form of a processing element scheduler, for example, an apparatus for a communication device includes a processing element and a storage element, and the processing element calls a program stored in the storage element to execute the method executed by the communication device in the above method embodiment. The memory elements may be memory elements on the same chip as the processing element, i.e. on-chip memory elements, or may be memory elements on a different chip than the processing element, i.e. off-chip memory elements.

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.

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.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

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

1. A method of cell selection, the method comprising:

receiving first power information corresponding to a first cell from a first network device, wherein the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N;

determining whether to select the first cell according to the first power information.

2. The method of claim 1, wherein determining whether to select the first cell based on the first power information comprises:

determining whether to select the first cell according to an ith first power parameter of the M first power parameters indicated by the first power information, wherein the ith first power parameter corresponds to a first power level of the N power levels, and the first power level is a power level of User Equipment (UE).

3. The method of claim 2, wherein the ith first power parameter is a maximum output power P allowed to be used by the UE by the first network device corresponding to the first power class_EMAXiOr the ith first power parameter is a power offset P corresponding to the first power level_offsetiI belongs to {1, M }.

4. The method of claim 3, wherein determining whether to select the first cell based on the first power information comprises:

determining a cell selection reception level value S based on the first power information_rxlevWhether a first criterion is met to determine whether to select the first cell;

wherein, the S_rxlevIs based on the power compensation value P_compensationAnd (4) obtaining the product.

5. The method of claim 4,

the P is_compensation＝max(P_EMAXi–P_PowerClass0), wherein P_PowerClassIs the maximum output power of the UE; alternatively, the first and second electrodes may be,

the P is_compensation＝max(P_EMAX–(P_PowerClass–P_offseti) 0), or, said P_compensation＝max(P_EMAX+P_offseti0), wherein P_EMAXA maximum output power allowed for the UE to use for the first network device.

6. The method according to any one of claims 2 to 5, wherein the UE is a UE of massive machine type communication (mMTC), or the UE supports uplink coverage enhancement, or P of the UE_PowerClassLess than 23db mw.

7. The method according to any one of claims 1 to 6, further comprising:

receiving first information sent by the first network device, where the first information is used to indicate a correspondence between the M first power parameters and the N power levels.

8. A method of cell selection, the method comprising:

sending first power information corresponding to a first cell to User Equipment (UE), wherein the first power information comprises M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is smaller than or equal to N.

9. The method of claim 8, further comprising:

and sending first information to the UE, wherein the first information is used for indicating the corresponding relation between the M first power parameters and the N power levels.

10. A communication apparatus, characterized in that the communication apparatus comprises:

a receiving module, configured to receive first power information corresponding to a first cell from a first network device, where the first power information includes M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N;

a processing module to determine whether to select the first cell based on the first power information.

11. The communications apparatus of claim 10, wherein the processing module is configured to determine whether to select the first cell according to the first power information, and comprises:

the processing module determines whether to select the first cell according to an ith first power parameter of the M first power parameters indicated by the first power information, where the ith first power parameter corresponds to a first power class of the N power classes, and the first power class is a power class of the UE.

12. The communications apparatus of claim 11, wherein the ith first power parameter is a maximum output power P allowed to be used by the UE by the first network device corresponding to the first power class_EMAXiOr the ith first power parameter is a power offset P corresponding to the first power level_offsetiI belongs to {1, M }.

13. The communications apparatus of claim 12, wherein the processing module determines whether to select the first cell based on the first power information comprises:

the processing module determines a cell selection reception level value S according to the first power information_rxlevWhether a first criterion is met to determine whether to select the first cell;

14. The communication device of claim 13,

15. The communication device according to any one of claims 10 to 14, wherein the communication device is a mass machine type communication mtc communication device, or the communication device supports uplink coverage enhancement, or P of the communication device_PowerClassLess than 23 dBm.

16. The apparatus according to any one of claims 10 to 15, wherein the receiving module is further configured to receive first information sent from the first network device, where the first information is used to indicate correspondence between the M first power parameters and the N power levels.

17. A communications apparatus, comprising:

a sending module, configured to send, by a UE, first power information corresponding to a first cell, where the first power information includes M first power parameters, the M first power parameters correspond to N power levels, M is an integer greater than 1, and M is less than or equal to N.

18. The communications apparatus of claim 17, wherein the means for transmitting is further configured to transmit first information to the UE, the first information indicating a correspondence between the M first power parameters and the N power levels.

19. A network system, characterized in that the network system comprises a terminal device for performing the method according to any of claims 1 to 7 and a network device for performing the method according to any of claims 8 to 9.

20. A computer storage medium for storing computer-executable instructions which, when executed by a computer, implement the method of any one of claims 1 to 7.

21. A computer storage medium for storing computer-executable instructions which, when executed by a computer, implement the method of any one of claims 8 to 9.