CN109219132B

CN109219132B - Channel selection method and device

Info

Publication number: CN109219132B
Application number: CN201710518683.3A
Authority: CN
Inventors: 尤肖虎; 汪茂; 张军; 刘亚林
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-06-29
Filing date: 2017-06-29
Publication date: 2021-02-09
Anticipated expiration: 2037-06-29
Also published as: CN109219132A

Abstract

The embodiment of the invention relates to a channel selection method and a channel selection device. The method comprises the following steps: a base station sends a system broadcast signal to a terminal, wherein the system broadcast signal comprises first indication information, the first indication information is used for indicating at least one group of first frequency band sets, the first frequency band sets comprise at least one first frequency band, and the at least one group of first frequency band sets are used for the terminal to determine at least one second frequency band in all frequency bands included in the at least one group of first frequency band sets; the base station receives an uplink random access signal sent by the terminal, wherein the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band; the first frequency band is a frequency band available for communication with the terminal.

Description

Channel selection method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a channel selection method and apparatus.

Background

At present, in a communication system, interference situations in multiband communication are complex. In China, the 230MHz band consists of 480 bands, occupying 12MHz (223MHz to 235MHz) bandwidth, each band being 25 KHz. Of the 480 bands, only 40 discrete bands are licensed for the power system, while the remaining bands are used by other systems (hydrological monitoring of water systems, power load monitoring of energy systems, military use, etc.).

Therefore, when the 40 frequency bands authorized by the power system are used for transmitting signals, the signals are interfered by the non-power system authorized frequency bands.

In the existing Long Term Evolution (LTE) 230 system, a traditional Time Division Long Term Evolution (TD-LTE) mode is adopted for channel selection. TD-LTE is a Time Division Duplex (TDD) system. TDD systems generally have reciprocity of default channels, i.e. the uplink and downlink channel quality is the same. That is, when the base station obtains the interference information of a certain frequency band from the uplink channel, the interference condition of the downlink channel of the frequency band is defaulted to be the same as that of the uplink channel; when the terminal obtains the interference information of a certain frequency band from the downlink channel, the interference condition of the uplink channel of the frequency band is defaulted to be the same as that of the downlink channel.

However, in the 230MHz multiband system, the interference sources of the base station and the terminal are different, and therefore, the uplink interference and the downlink interference received when the signals are transmitted are also different. However, as the LTE230 does not have a mechanism for optimizing the channel, the default channel still has reciprocity, and for a 230MHz multiband system susceptible to adjacent channel interference, when the base station and the terminal communicate by using the LTE230, the channel cannot be optimized, which reduces the communication quality and the system coverage performance.

Disclosure of Invention

The embodiment of the invention provides a channel selection method and a channel selection device, which realize the simultaneous bidirectional selection of a base station and a terminal on a channel, improve the anti-interference capability of a communication system, and also improve the quality of receiving uplink random access signals and the detection rate of the uplink random access signals.

In a first aspect, an embodiment of the present invention provides a channel selection method, where the method includes:

the base station sends a system broadcast signal to the terminal; the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one group of first frequency band sets, where the first frequency band set includes at least one first frequency band, and the at least one group of first frequency band sets is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets;

the base station receives an uplink random access signal sent by the terminal, wherein the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band;

the first frequency band is a frequency band available for communication with the terminal.

With reference to the first aspect, in a first possible implementation manner, before the sending, by the base station, a system broadcast signal to a terminal, the method includes:

the base station carries out grouping processing on all authorized frequency bands to obtain at least two groups of frequency band sets; the authorized frequency band is a frequency band allocated to the base station and the terminal for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent;

forming a plurality of combination modes comprising at least one group of frequency band sets according to the at least two groups of frequency band sets, and establishing a corresponding relation between the first indication information and each combination mode in the plurality of combination modes by the base station;

and the base station sends a notification message to the terminal, wherein the notification message is used for informing the terminal of the corresponding relation.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, after the sending, by the base station, the notification message to the terminal, the method includes:

the base station determines the number of frequency bands of which the noise interference value of the frequency band in each group of frequency band set is smaller than a preset first threshold;

the base station takes the frequency band set with the number value larger than a preset second threshold value as the first frequency band set;

and the base station generates the first indication information according to the first frequency band set and the corresponding relation, wherein the frequency band set included in the combination mode corresponding to the first indication information is the same as the first frequency band set.

With reference to the first aspect, in a third possible implementation manner, after the receiving, by the base station, an uplink random access signal sent by the terminal, the method includes:

and the base station takes any second frequency band of the uplink random access signal sent by the terminal as a communication frequency band for communicating with the terminal.

With reference to the first aspect, in a fourth possible implementation manner, the second frequency band is specifically a frequency band corresponding to an SINR value, where an SINR value of a signal to interference plus noise ratio is not less than a preset third threshold, in all frequency bands included in the at least one group of first frequency band sets.

With reference to any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner, all frequency bands included in the at least one group of first frequency band sets are power licensed frequency bands.

In a second aspect, an embodiment of the present invention provides a channel selection method, where the method includes:

a terminal receives a system broadcast signal sent by a base station, wherein the system broadcast signal comprises first indication information;

the terminal determines at least one group of first frequency band sets correspondingly indicated by the first indication information according to the first indication information, wherein the first frequency band sets comprise at least one first frequency band, and the first frequency band is a frequency band which is determined by the base station and can be used for communicating with the terminal;

the terminal determines at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets;

and the terminal sends an uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band.

With reference to the second aspect, in a first possible implementation manner, before the terminal receives a system broadcast signal sent by a base station, the method includes:

the terminal receives a notification message sent by the base station;

according to the notification message, the terminal determines the corresponding relation of each combination mode in a plurality of combination modes comprising at least one group of frequency band sets formed by the first indication information and the at least two groups of frequency band sets;

the determining, by the terminal, at least one group of first frequency band sets indicated by the first indication information according to the first indication information specifically includes:

the terminal determines at least one group of first frequency band sets correspondingly indicated by the first indication information according to the first indication information and the corresponding relation;

the frequency band set included in the combination mode corresponding to the first indication information is the same as the first frequency band set;

the authorized frequency bands are frequency bands allocated to the terminal and the base station for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the first frequency band set is specifically a frequency band set in which the noise interference value of the frequency band in each group of frequency band sets is smaller than a number of frequency bands of a preset first threshold, and the number of frequency bands is greater than a preset second threshold.

With reference to the second aspect, in a third possible implementation manner, the determining, by the terminal, at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets specifically includes:

the terminal calculates the SINR value of the downlink signal sent by the base station and received by the terminal at each frequency band included in the at least one group of first frequency band sets;

and the terminal takes the frequency band corresponding to the SINR value not less than the preset third threshold value as the second frequency band.

With reference to the second aspect, in a fourth possible implementation manner, the sending, by the terminal, an uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band specifically includes:

the terminal randomly selects any frequency band in the at least one second frequency band, and sends the uplink random access signal to the base station through the randomly selected subcarrier of any frequency band;

alternatively, the first and second electrodes may be,

the terminal calculates the SINR value of the signal to interference plus noise ratio (SINR) of the downlink signal sent by the base station and received by the terminal at each second frequency band;

and the terminal sends an uplink random access signal to the base station through the subcarrier of the frequency band corresponding to the maximum value of the SINR value.

With reference to any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner, all frequency bands included in the at least one group of first frequency band sets are power licensed frequency bands.

In a third aspect, an embodiment of the present invention provides a base station, where the base station includes:

a processor, configured to generate a system broadcast signal, and transmit the system broadcast signal to a transmitter, where the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one group of first frequency band sets, where the first frequency band set includes at least one first frequency band, and the at least one group of first frequency band sets is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets;

a transmitter for receiving the system broadcast signal transmitted by the processor and transmitting the system broadcast signal to a terminal;

a receiver, configured to receive an uplink random access signal sent by the terminal and transmit the uplink random access signal to the processor, where the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band;

the processor is further configured to receive the uplink random access signal transmitted by the receiver;

With reference to the third aspect, in a first possible implementation manner, the processor is further configured to perform grouping processing on all authorized frequency bands to obtain at least two groups of frequency band sets; the authorized frequency band is a frequency band allocated to the base station and the terminal for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent;

establishing a corresponding relation between the first indication information and each combination mode in the multiple combination modes according to multiple combination modes comprising at least one group of frequency band sets formed by the at least two groups of frequency band sets;

generating a notification message and transmitting the notification message to the sender, wherein the notification message is used for informing the terminal of the corresponding relationship;

the transmitter is further configured to receive the notification message transmitted by the processor, and transmit the notification message to the terminal.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, the processor is further configured to determine a number of frequency bands of which noise interference values of the frequency bands in each group of frequency band sets are smaller than a preset first threshold;

taking the frequency band set corresponding to the frequency band set with the number larger than a preset second threshold value as the first frequency band set;

and generating the first indication information according to the first frequency band set and the corresponding relation, wherein the frequency band set included in the corresponding combination mode of the first indication information is the same as the first frequency band set.

With reference to the third aspect, in a third possible implementation manner, the processor is further configured to use any one of the second frequency bands, where the uplink random access signal is sent by the terminal, as a communication frequency band for communicating with the terminal.

With reference to the third aspect, in a fourth possible implementation manner, the second frequency band is specifically a frequency band corresponding to an SINR value, where an SINR value of a signal to interference plus noise ratio SINR in all frequency bands included in the at least one group of first frequency band sets is not less than a preset third threshold.

With reference to any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner, all frequency bands included in the at least one group of first frequency band sets are power licensed frequency bands.

In a fourth aspect, an embodiment of the present invention provides a terminal, where the terminal includes:

the receiver is used for receiving a system broadcast signal sent by a base station, wherein the system broadcast signal comprises first indication information;

a processor, configured to receive the system broadcast signal transmitted by the receiver, and determine, according to the first indication information, at least one group of first frequency band sets indicated by the first indication information, where the first frequency band set includes at least one first frequency band, and the first frequency band is a frequency band determined by the base station and available for communication with the terminal;

the processor is further configured to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets, select any one second frequency band from the at least one second frequency band, and transmit an identifier of the any one second frequency band to the transmitter;

and the transmitter is used for receiving the identifier of any second frequency band transmitted by the processor and transmitting an uplink random access signal to the base station on the subcarrier corresponding to any second frequency band through the identifier of any second frequency band.

With reference to the fourth aspect, in a first possible implementation manner, the receiver is further configured to receive a notification message sent by the base station and transmit the notification message to the processor;

the processor is further configured to receive the notification message transmitted by the receiver,

determining the corresponding relation of each combination mode in a plurality of combination modes comprising at least one group of frequency band sets formed by the first indication information and at least two groups of frequency band sets according to the notification message;

the processor is further specifically configured to determine, according to the first indication information and the correspondence, at least one group of first frequency band sets indicated by the first indication information;

the at least two groups of frequency band sets are obtained after the base station groups all authorized frequency bands, the authorized frequency bands are frequency bands which are allocated to the terminal and the base station and used for communication transmission, each group of frequency band set in the at least two groups of frequency band sets comprises at least two frequency bands, and any two frequency bands in the at least two frequency bands are not adjacent.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the first frequency band set is specifically a frequency band set in which the noise interference value of the frequency band in each group of frequency band sets is smaller than a number of frequency bands of a preset first threshold, and the number of frequency bands is greater than a preset second threshold.

With reference to the fourth aspect, in a third possible implementation manner, the processor is specifically configured to calculate a signal to interference plus noise ratio SINR value of the terminal receiving the downlink signal sent by the base station at each frequency band included in the at least one group of first frequency band sets;

and taking the frequency band corresponding to the SINR value not less than the preset third threshold value as the second frequency band.

With reference to the fourth aspect, in a fourth possible implementation manner, the processor is specifically configured to randomly select any frequency band in the at least one second frequency band, and transmit an identifier of any randomly selected frequency band to the transmitter;

alternatively, the first and second electrodes may be,

the processor 1020 is specifically configured to calculate a signal to interference plus noise ratio SINR value of the downlink signal sent by the base station and received by the terminal at each of the second frequency bands;

and transmitting the identification of the frequency band corresponding to the maximum value of the SINR value to the transmitter.

With reference to any one of the first to fourth possible implementation manners of the fourth aspect, in a fifth possible implementation manner, all frequency bands included in the at least one group of first frequency band sets are power licensed frequency bands.

In a fifth aspect, an embodiment of the present invention provides a channel selection apparatus, where the apparatus includes:

a transmitting unit for transmitting a system broadcast signal to a terminal; the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one set of first frequency band set, where the first frequency band set includes at least one first frequency band, and the at least one set of first frequency band set is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one set of first frequency band set

A receiving unit, configured to receive an uplink random access signal sent by the terminal, where the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band;

With reference to the fifth aspect, in a first possible implementation manner, the apparatus further includes:

the grouping unit is used for grouping all authorized frequency bands to obtain at least two groups of frequency band sets; the authorized frequency band is a frequency band allocated to the device and the terminal for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent;

the establishing unit is used for forming a plurality of combination modes comprising at least one group of frequency band sets according to the at least two groups of frequency band sets, and the base station establishes the corresponding relation between the first indication information and each combination mode in the plurality of combination modes;

the sending unit is further configured to send a notification message to the terminal, where the notification message is used to notify the terminal of the correspondence.

With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner, the apparatus further includes:

the determining unit is used for determining the number of frequency bands of which the noise interference value of the frequency band in each group of frequency band set is smaller than a preset first threshold;

a forming unit, configured to use a frequency band set corresponding to the frequency band set with the number greater than a preset second threshold as the first frequency band set;

and a generating unit, configured to generate the first indication information according to the first frequency band set and the corresponding relationship, where a frequency band set included in a combination mode corresponding to the first indication information is the same as the first frequency band set.

With reference to the fifth aspect, in a third possible implementation manner, the apparatus further includes:

and the processing unit is used for taking any second frequency band of the uplink random access signal sent by the terminal as a communication frequency band for communicating with the terminal.

With reference to the fifth aspect, in a fourth possible implementation manner, the second frequency band is specifically a frequency band corresponding to an SINR value, where an SINR value of a signal to interference plus noise ratio SINR in all frequency bands included in the at least one group of first frequency band sets is not less than a preset third threshold. With reference to any one of the first to fourth possible implementation manners of the fifth aspect, in a fifth possible implementation manner, all frequency bands included in the at least one group of first frequency band sets are power licensed frequency bands.

In a sixth aspect, an embodiment of the present invention provides a channel selection apparatus, where the apparatus includes:

the receiving unit is used for receiving a system broadcast signal sent by a base station, wherein the system broadcast signal comprises first indication information;

a determining unit, configured to determine, according to the first indication information, at least one group of first frequency band sets indicated by the first indication information, where the first frequency band set includes at least one first frequency band, and the first frequency band is a frequency band determined by the base station and available for communicating with the terminal;

the determining unit is further configured to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets;

and the sending unit is used for sending the uplink random access signal to the base station through the subcarrier corresponding to any one of the at least one second frequency band.

With reference to the sixth aspect, in a first possible implementation manner, the receiving unit is further configured to receive a notification message sent by the base station;

the determining unit is further configured to determine, according to the notification message, a correspondence relationship between the first indication information and each of multiple combination modes, which include at least one group of frequency band sets, formed by at least two groups of frequency band sets;

the determining unit is specifically configured to determine, according to the first indication information and the corresponding relationship, at least one group of first frequency band sets indicated by the first indication information;

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner, the first frequency band set is specifically a frequency band set in which the noise interference value of the frequency band in each group of frequency band sets is smaller than a number of frequency bands of a preset first threshold, and the number of frequency bands is larger than a preset second threshold.

With reference to the sixth aspect, in a third possible implementation manner, the determining unit is specifically configured to calculate a signal to interference plus noise ratio, SINR, value at which the apparatus receives a downlink signal sent by the base station at each frequency band included in the at least one group of first frequency band sets;

With reference to the sixth aspect, in a fourth possible implementation manner, the sending unit is specifically configured to randomly select any frequency band in the at least one second frequency band, and send the uplink random access signal to the base station through a subcarrier of any randomly selected frequency band;

alternatively, the first and second electrodes may be,

the sending unit is specifically configured to calculate a signal to interference plus noise ratio SINR value at each of the second frequency bands at which the apparatus receives the downlink signal sent by the base station;

and sending an uplink random access signal to the base station through the subcarrier of the frequency band corresponding to the maximum value of the SINR value.

With reference to any one of the first to fourth possible implementation manners of the sixth aspect, in a fifth possible implementation manner, all frequency bands included in the at least one group of first frequency band sets are power licensed frequency bands.

In a seventh aspect, an embodiment of the present invention provides a computer-readable storage medium storing a program, where the program includes instructions for executing the method in the foregoing first aspect.

In an eighth aspect, the present invention provides a computer-readable storage medium storing a program, where the program includes instructions for executing the method of the second aspect.

Compared with the prior art, in the channel selection method and apparatus provided in the embodiments of the present invention, after determining at least one group of first frequency band sets, the base station sends a system broadcast signal to the terminal, where the system broadcast signal includes first indication information for indicating the at least one group of first frequency band sets. And the terminal determines at least one second frequency band from all the frequency bands included in at least one group of first frequency band set indicated by the first indication information according to the first indication information. And the terminal sends the uplink random signal to the base station through the subcarrier corresponding to any one of the at least one second frequency band, so that the base station takes the frequency band for sending the uplink random signal as a communication frequency band for communicating with the terminal. The base station and the terminal can simultaneously select the channel in two directions, the anti-interference capability of the communication system is improved, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are also improved.

Drawings

Fig. 1 is a diagram of an application scenario of an electrical power system according to an embodiment of the present invention;

fig. 2 is a flowchart of a channel selection method according to an embodiment of the present invention;

fig. 3 is a flowchart of another channel selection method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of 40 authorized power bands and groups according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a base station broadcasting a first set of frequency bands according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a terminal determining a second frequency band according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a channel selection apparatus according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another channel selection apparatus according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a hardware structure of a base station according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a terminal hardware structure according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one skilled in the art from the embodiments given herein are intended to be within the scope of the invention.

Referring to fig. 1, fig. 1 is a diagram illustrating an application scenario of an electrical power system to which the embodiment of the invention can be applied. The system is composed of a plurality of terminals, a base station and a network element. The terminal is specifically an intelligent terminal with functions of receiving, sending, processing and displaying messages, and the intelligent terminal may include a desktop computer, a personal computer, a tablet computer, a vehicle-mounted computer, and the like.

As shown in fig. 1, the terminal is located at a residential user area, a commercial office building, a power distribution room, a vehicle in a moving state, and the like. Residential user areas and commercial office buildings are connected with transformer substations through power distribution rooms, and the transformer substations are connected with power supply buildings. The base station is located at a substation. The terminal is responsible for collecting power utilization information of the region (position), current network state information and the like. The terminal establishes a connection with the base station through a wireless network. The base station can be in communication interaction with the terminal. For example: the terminal sends the collected information to the base station, and the base station processes the information and feeds the processed information back to the terminal after receiving the information sent by the terminal; the base station transmits an access instruction to the terminal, receives an access result transmitted by the terminal, and the like.

The embodiment of the invention provides a channel selection method. The base station broadcasts the first indication information to the terminal, the terminal determines at least one second frequency band from all frequency bands included in the first frequency band set according to the first frequency band set indicated by the first indication information, and then selects a bidirectional optimal second frequency band from the second frequency band to communicate with the base station. The channel selection method provided by the invention can quickly optimize the communication frequency band, and is particularly suitable for the application scene of the Internet of things.

The scheme provided by the embodiment of the invention is explained in the following with reference to the attached figure 2. Fig. 2 is a flowchart of a channel selection method according to an embodiment of the present invention. In the method, the execution subject is a base station. The method can be applied in an IoT230 system or other multiband systems. The method specifically comprises the following steps:

step 210, the base station sends a system broadcast signal to the terminal, where the system broadcast signal includes first indication information, the first indication information is used to indicate at least one group of first frequency band sets, each first frequency band set includes at least one first frequency band, and the at least one group of first frequency band sets is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets.

Specifically, the base station determines at least one group of first frequency band sets. The first set of frequency bands includes at least one first frequency band. The base station indicates at least one group of first frequency band sets by using the first indication information. The terminal carries the first indication information in the system broadcast signal. The base station transmits a system broadcast signal to the terminal.

The first frequency band is a frequency band which is determined by the base station and can be used for carrying out uplink communication with the terminal; the second frequency band is specifically a frequency band corresponding to an SINR value of which a Signal to Interference plus Noise Ratio (SINR) value is not less than a preset third threshold in all frequency bands included in the at least one group of first frequency band sets.

As an example and not by way of limitation, in the IoT230 System, a base station transmits a System Information Block (SIB) to a terminal through a Physical Broadcast Channel (PBCH), where the SIB includes first indication Information for indicating at least one set of first frequency band sets.

After receiving the system broadcast signal, the terminal acquires first indication information from the system broadcast signal. And determining at least one group of first frequency band sets corresponding to the indication of the first indication information according to the first indication information, and determining at least one first frequency band from the first frequency band sets. The terminal determines at least one second frequency band from all frequency bands included in at least one group of first frequency band sets.

In one implementation manner, the terminal calculates that the terminal receives an SINR value of a downlink signal transmitted by the base station at each frequency band included in at least one first set of frequency bands. And the terminal sorts the calculated SINR values. And according to the sorting result, the terminal compares each SINR value with a preset third threshold value to obtain the SINR value not less than the third threshold value. And the terminal takes the frequency band corresponding to the SINR value not less than the third threshold value as the second frequency band.

Step 220, the base station receives an uplink random access signal sent by the terminal, where the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band.

Specifically, in an implementation manner, after determining at least one second frequency band, the terminal randomly selects any frequency band from the at least one second frequency band, and sends an uplink random access signal in a subcarrier of the any frequency band.

In another implementation manner, the terminal calculates the SINR value of the downlink signal transmitted by the base station at each second frequency band. The terminal sorts the SINR values. And according to the sequencing result, the terminal takes the frequency band corresponding to the maximum value of the SINR value as the frequency band for sending the uplink random access signal, and sends the uplink random access signal to the base station on the subcarrier of the frequency band.

And the base station receives an uplink random access signal sent by the terminal.

Therefore, by applying the channel selection method provided by the embodiment of the present invention, after determining at least one group of first frequency band sets, the base station sends a system broadcast signal to the terminal, where the system broadcast signal includes first indication information for indicating at least one group of first frequency band sets. And the terminal determines at least one second frequency band from all the frequency bands included in at least one group of first frequency band set indicated by the first indication information according to the first indication information. And the terminal sends the uplink random signal to the base station through the subcarrier corresponding to any one of the at least one second frequency band, so that the base station takes the frequency band for sending the uplink random signal as a communication frequency band for communicating with the terminal. The base station and the terminal can simultaneously select the channel in two directions, the anti-interference capability of the communication system is improved, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are also improved.

Optionally, before step 210 in the embodiment of the present invention, the method further includes grouping, by the base station, all authorized frequency bands to obtain at least two sets of frequency band sets. And forming a plurality of combination modes including at least one group of frequency band set according to at least two groups of frequency band sets, establishing a corresponding relation between the first indication information and each combination mode in the plurality of combination modes, and informing the terminal of the corresponding relation. Through the step, the terminal determines the grouping result of the base station to all authorized frequency bands and determines the corresponding relation between the first indication information and each combination mode in the multiple combination modes, and the terminal can make sure at least one group of first frequency band set indicated by the first indication information after receiving the system broadcast signal subsequently through the corresponding relation.

Specifically, the base station performs grouping processing on all authorized frequency bands to obtain at least two groups of frequency band sets. The authorized frequency band is a frequency band allocated to the base station and the terminal for communication transmission. Each set of frequency bands in the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands in the at least two frequency bands are not adjacent. And the base station establishes a corresponding relation between the first indication information and each combination mode in the multiple combination modes according to multiple combination modes comprising at least one group of frequency band sets formed by at least two groups of frequency band sets. And the base station sends a notification message to the terminal, wherein the notification message is used for informing the terminal of the corresponding relation.

Optionally, after the base station sends the notification message to the terminal, the base station further includes a step of determining, by the base station, the first frequency band set and the first frequency band from the at least two sets of frequency band sets. Through the step, the base station determines at least one group of first frequency band sets available when the terminal and the base station carry out uplink communication, and notifies the determined at least one group of first frequency band sets to the terminal, so that the terminal determines at least one second frequency band on the basis of the at least one first frequency band. The second frequency band is not only the frequency band preferred by the base station for the communication with the terminal, but also the frequency band preferred by the terminal for the communication with the base station, so that the two-way selection of the base station and the terminal to the channel is realized, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are improved.

Specifically, the base station calculates the noise interference value of the frequency band in each set of frequency bands. The base station judges whether the noise interference value of the frequency band is smaller than a preset first threshold value, and if the noise interference value of the frequency band is smaller than the first threshold value, the base station determines the numerical value of the frequency band with the noise interference value smaller than the preset first threshold value. And the base station judges whether the number value of the frequency bands with the noise interference value smaller than the first threshold value is larger than a preset second threshold value. And if the number value is greater than the second threshold value, the base station takes the frequency band set corresponding to the number value greater than the second threshold value as a first frequency band set, and the frequency band included in the first frequency band set is a first frequency band. If the number is not greater than the second threshold, the base station still determines the first frequency band set, but the base station sets the first frequency band set as an empty set. When the base station sends a system broadcast signal to the terminal, the first indication information carried in the system broadcast information is an indication for prohibiting the terminal from accessing the base station. And the terminal determines that the base station cannot be accessed currently according to the indication.

Optionally, in this embodiment of the present invention, the base station identifies the first indication information by using a binary bitmap. The base station reserves at least 2 bits in the system broadcast signal to represent the binary bit map.

Specifically, the base station represents the first indication information by at least 2 bits according to the grouping result of all authorized frequency bands. The first indication information is used for indicating at least one group of first frequency band sets. I.e. the base station may represent the first set of frequency bands by at least 2 bits.

In one example, when the base station divides all the licensed frequency bands into two groups, the base station obtains a frequency band set 1 and a frequency band set 2. The base station determines the noise interference value of each frequency band in the frequency band set 1, and if the noise interference value of each frequency band in the frequency band set 1 is smaller than a first threshold, the base station determines the number of the frequency bands with the noise interference value smaller than the first threshold. And the base station judges whether the number of the frequency bands with the noise interference values smaller than the first threshold value is larger than a second threshold value. If the number is greater than the second threshold, the base station takes the frequency band set 1 as a first frequency band set, the frequency band included in the first frequency band set is the first frequency band, otherwise, the frequency band set 1 is not the first frequency band set. Similarly, if the noise interference value of each frequency band in the frequency band set 2 is smaller than the first threshold, the base station determines the number of frequency bands with the noise interference value smaller than the first threshold. And the base station judges whether the number of the frequency bands with the noise interference values smaller than the first threshold value is larger than a second threshold value. If the number is greater than the second threshold, the base station uses the frequency band set 2 as a first frequency band set, the frequency band included in the first frequency band set is the first frequency band, otherwise, the frequency band set 2 is not the first frequency band set.

Thus, in this example, the first set of frequency bands may be formed by a combination of the following sets of frequency bands: a frequency band set 1; a frequency band set 2; frequency band set 1 and frequency band set 2. That is, the frequency bands included in the first frequency band set are formed by the frequency bands included after the frequency band set 1 and the frequency band set 2 are combined. In the embodiment of the present invention, the base station may indicate the first frequency band set by using 1 bit originally used for indicating access barring (access barring) and 1 bit reserved in the system broadcast signal. 00 indicates an access barring function, namely when the first frequency band set is a null set, the terminal is forbidden to access the base station; 01 indicates that the first frequency band set is a frequency band set 1, and the frequency band set 1 is the optimal frequency band; 10 indicates that the first frequency band set is a frequency band set 2, and the frequency band set 2 is the optimal frequency band; 11 indicates that the first band set is a band set 1 and a band set 2, and the band set 1 and the band set 2 are both preferred bands.

It is understood that "00", "01", "10", and "11" are the first indication information.

In another example, when the base station groups all the licensed bands into three groups, the base station obtains a band set 1, a band set 2, and a band set 3. The base station determines the noise interference value of each frequency band in the frequency band set 1, and if the noise interference value of each frequency band in the frequency band set 1 is smaller than a first threshold, the base station determines the number of the frequency bands with the noise interference value smaller than the first threshold. And the base station judges whether the number of the frequency bands with the noise interference values smaller than the first threshold value is larger than a second threshold value. If the number is greater than the second threshold, the base station takes the frequency band set 1 as a first frequency band set, the frequency band included in the first frequency band set is the first frequency band, otherwise, the frequency band set 1 is not the first frequency band set. Similarly, the base station determines whether the noise interference value of each frequency band in the frequency band set 2 and the frequency band set 3, and the number of frequency bands with the noise interference value smaller than the first threshold value are larger than the second threshold value.

In this example, the first set of frequency bands may be formed by a combination of the following sets of frequency bands: a frequency band set 1; a frequency band set 2; a frequency band set 3; a frequency band set 1 and a frequency band set 2; a frequency band set 1 and a frequency band set 3; a frequency band set 2 and a frequency band set 3; frequency band set 1, frequency band set 2, and frequency band set 3. That is, the frequency bands included in the first frequency band set are formed by the frequency bands included after the frequency band set 1, the frequency band set 2, and the frequency band set 3 are combined.

In the embodiment of the present invention, the base station may indicate the first frequency band set by using 1 bit for indicating access barring (access barring) and 2 bits reserved in the system broadcast signal. 000 indicating access barring function, namely prohibiting the terminal from accessing the base station when the first frequency band set is a null set; 001 indicates that the first frequency band set is a frequency band set 1, and the frequency band set 1 is the optimal frequency band; 010 indicates that the first frequency band set is a frequency band set 2, and the frequency band set 2 is the optimal frequency band; 011 indicates that the first frequency band set is a frequency band set 1 and a frequency band set 2, and the frequency band set 1 and the frequency band set 2 are both frequency bands with excellent quality; 100 indicates that the first frequency band set is a frequency band set 3, and the frequency band set 3 is the optimal frequency band; 101 indicates that the first frequency band set is a frequency band set 1 and a frequency band set 3, and the frequency band set 1 and the frequency band set 3 are both excellent frequency bands; 110 indicates that the first band set is band set 2 and band set 3, and the band set 2 and the band set 3 are both preferred bands; 111 indicates that the first frequency band set is a frequency band set 1, a frequency band set 2, and a frequency band set 3, and the frequency band set 1, the frequency band set 2, and the frequency band set 3 are all preferred.

It is understood that "000", "001", "010", "011", "100", "101", "110", and "111" are the first indication information.

The foregoing description takes the base station dividing all authorized frequency bands into two groups and three groups as an example. In practical application, the base station may also divide all the licensed frequency bands into multiple groups according to needs, but the process is similar to the foregoing process, and will not be repeated here.

It should be noted that, since the number of all authorized frequency bands is 40, when the 40 frequency bands are equally divided into even number of frequency band sets, the second threshold may be the same value for each frequency band set. For example, when the 40 frequency bands are equally divided into four frequency band sets, each frequency band set includes 10 frequency bands, the second threshold may be 5.

When the 40 frequency bands are divided into an odd number of frequency band sets, the second threshold value is not the same value for each frequency band set. For example, when the 40 frequency bands are divided into three frequency band sets, two frequency band sets include 13 frequency bands, and one frequency band set includes 14 frequency bands, the second threshold may be 40% of the total number of frequency bands in each frequency band set.

When the 40 frequency bands are divided into odd frequency band sets, the 40 frequency bands should be equally divided as much as possible.

Optionally, after step 220 in the embodiment of the present invention, the method further includes that the base station uses any second frequency band for sending the uplink random access signal as a communication frequency band for communicating with the terminal. Through the step, the frequency band of the base station for receiving the uplink signal is a communication frequency band which is selected bidirectionally by the base station and the terminal, so that the base station and the terminal can simultaneously select channels bidirectionally, and the anti-interference capability and the communication coverage performance of the multi-band system are improved.

Specifically, after receiving an uplink random access signal sent by a terminal, a base station determines a frequency band for sending the uplink random access signal. The frequency band is randomly selected by the terminal in at least one second frequency band; or, the frequency band is a frequency band corresponding to the maximum value of the SINR value after the terminal calculates the SINR value of the downlink signal sent by the base station at each second frequency band. And after determining the frequency band, the base station records the corresponding relation between the frequency band and the terminal. In subsequent communication with the terminal, the base station takes the frequency band as a frequency band for communication with the terminal (the communication comprises uplink communication and downlink communication).

Optionally, in an embodiment of the present invention, all frequency bands included in the at least one first set of frequency bands are power licensed frequency bands.

The scheme provided by the embodiment of the invention is explained in the following with reference to fig. 3. Fig. 3 is a flowchart of another channel selection method according to an embodiment of the present invention. In the method, the execution subject is a terminal. The method can be applied in an IoT230 system or other multiband systems. The method specifically comprises the following steps:

step 310, the terminal receives a system broadcast signal sent by the base station, where the system broadcast signal includes first indication information.

Specifically, the base station determines at least one group of first frequency band sets. The first set of frequency bands includes at least one first frequency band. The base station generates first indication information and indicates at least one group of first frequency band sets by the first indication information. The terminal carries the first indication information in the system broadcast signal.

The base station transmits a system broadcast signal to the terminal. In this embodiment of the present invention, the at least one first set of frequency bands is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one first set of frequency bands.

The first frequency band set is specifically a frequency band set in which the noise interference value of the frequency bands in the at least two groups of frequency band sets is smaller than a preset first threshold, and the number is greater than a preset second threshold, the frequency band included in the first set is a first frequency band, and the first frequency band is also a frequency band determined by the base station and available for communication with the terminal.

It is understood that the procedures of determining the first frequency band set and the first frequency band, generating the first indication information, and generating the system broadcast signal by the base station are described in detail in the foregoing embodiments, and will not be repeated herein.

By way of example and not limitation, in the IoT230 system, the base station transmits a SIB to the terminal through PBCH, where the SIB includes first indication information indicating at least one set of the first frequency band set.

Step 320, the terminal determines, according to the first indication information, at least one group of first frequency band sets indicated by the first indication information, where the first frequency band sets include at least one first frequency band.

Specifically, after receiving a system broadcast signal, the terminal acquires first indication information from the system broadcast signal. And determining at least one group of first frequency band sets correspondingly indicated by the first indication information according to the first indication information.

It should be noted that, before step 310 in this embodiment, the terminal receives a notification message sent by the base station, and the terminal obtains, through the notification message, a corresponding relationship between the first indication information established by the base station and at least two sets of frequency band sets obtained after performing grouping processing on all authorized frequency bands, where each of the multiple combination modes includes at least one set of frequency band set.

And the terminal determines at least one group of first frequency band sets corresponding to the indication of the first indication information through the corresponding relation.

It is to be understood that the process of the base station establishing the corresponding relationship between the first indication information and each of the plurality of combinations is described in detail in the foregoing embodiment, and will not be repeated here.

Step 330, the terminal determines at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets.

Specifically, after determining at least one group of first frequency band sets indicated by the first indication information according to the corresponding relationship, the terminal acquires all frequency bands included in the first frequency band sets. The terminal determines at least one second frequency band from all frequency bands included in at least one group of first frequency band sets.

In one implementation manner, the terminal calculates that the terminal receives an SINR value of a downlink signal transmitted by the base station at each frequency band included in at least one first set of frequency bands. And determining the second frequency band by comparing the plurality of SINR values with a preset third threshold value. Step 340, the terminal sends an uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band.

Specifically, after determining the second frequency band, the terminal selects any frequency band from at least one second frequency band, and sends the uplink random access signal in a subcarrier corresponding to the any frequency band.

Optionally, before step 310 in the embodiment of the present invention, a step of receiving, by the terminal, a notification message sent by the base station is further included. Through the step, the terminal determines the grouping result of the base station to all authorized frequency bands and determines the corresponding relation between the first indication information and each combination mode in the multiple combination modes, and the terminal can make sure at least one group of first frequency band set indicated by the first indication information after receiving the system broadcast signal subsequently through the corresponding relation.

Specifically, the terminal receives a notification message sent by the base station. According to the notification message, the terminal determines the corresponding relation of each combination mode in a plurality of combination modes which are formed by at least two groups of frequency band sets and comprise at least one group of frequency band sets. And the terminal determines at least one group of first frequency band set indicated by the first indication information when receiving the system broadcast signal carrying the first indication information according to the corresponding relation.

The frequency band set included in the combination mode corresponding to the first indication information is the same as the first frequency band set; the at least two groups of frequency band sets form a corresponding relation of each combination mode in multiple combination modes comprising the at least one group of frequency band sets, the authorized frequency band is a frequency band which is distributed to the terminal and the base station and used for communication transmission, each group of frequency band set in the at least two groups of frequency band sets comprises at least two frequency bands, and any two frequency bands in the at least two frequency bands are not adjacent.

Optionally, in step 320 of the embodiment of the present invention, the terminal determines at least one second frequency band from all frequency bands included in at least one group of the first frequency band sets, and the specific process is as follows:

and the terminal calculates the SINR value of the downlink signal sent by the base station at each frequency band included in at least one group of first frequency band sets. And the terminal sorts the calculated SINR values. And according to the sorting result, the terminal compares each SINR value with a preset third threshold value to obtain the SINR value not less than the third threshold value. And the terminal takes the frequency band corresponding to the SINR value not less than the third threshold value as the second frequency band.

Optionally, before step 330 in the embodiment of the present invention, the terminal determines at least one third frequency band from all the licensed frequency bands.

In step 330 of the embodiment of the present invention, the terminal determines at least one second frequency band from all frequency bands included in at least one group of first frequency band sets, and the specific process is as follows:

the terminal acquires the same frequency band from all frequency bands and at least one third frequency band included in at least one group of first frequency band sets. The terminal takes the same frequency band as a second frequency band.

Optionally, in the embodiment of the present invention, the terminal determines at least one third frequency band from all authorized frequency bands, and the specific process is as follows: the terminal determines all authorized frequency bands. In the embodiment of the present invention, the total authorized frequency bands are discrete 40 frequency bands allocated to the power system, and any two frequency bands in the 40 frequency bands are not adjacent to each other. And the terminal calculates the SINR value of the downlink signal sent by the base station at each frequency band in all the authorized frequency bands. The terminal sorts the SINR values. And according to the sorting result, the terminal acquires an SINR value not less than a preset fourth threshold. And the terminal takes the frequency band corresponding to the SINR value not less than the fourth threshold value as a third frequency band.

Optionally, in step 340 of the embodiment of the present invention, the terminal sends the uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band, where the specific process is as follows:

in one implementation manner, in at least one second frequency band, the terminal randomly selects any frequency band, and sends an uplink random access signal to the base station in a subcarrier of any randomly selected frequency band.

In another implementation manner, the terminal calculates the SINR value of the downlink signal transmitted by the base station at each second frequency band. The terminal sorts the SINR values. And according to the sequencing result, the terminal takes the frequency band corresponding to the maximum value of the SINR value as the frequency band for sending the uplink random access signal, and sends the uplink random access signal to the base station in the subcarrier of the frequency band.

In the embodiment of the invention, the terminal can not only select the optimal frequency band according to the SINR value of the downlink signal received at the frequency band, but also sequence the SINR values of the frequency band, thereby finding the optimal frequency band for communicating with the base station.

Optionally, in this embodiment of the present invention, all the frequency band power grant frequency bands included in the at least one first set of frequency bands are included.

The scheme provided by the embodiment of the invention is described below with reference to fig. 4, 5 and 6. Fig. 4 is a schematic diagram of 40 power authorized bands and groups according to an embodiment of the present invention. Fig. 5 is a schematic diagram of a base station broadcasting a first frequency band set according to an embodiment of the present invention. Fig. 6 is a schematic diagram illustrating that the terminal determines the second frequency band according to the embodiment of the present invention. The channel selection methods provided in fig. 4-6 can be applied in the IoT230 system or other multiband systems.

The base station carries out grouping processing on 40 electric power authorized frequency bands in 230MHz frequency bands of the electric power wireless communication system to obtain three groups of frequency band sets. It can be understood that, in order to distinguish the 40 licensed frequency bands, in the embodiment of the present invention, a reference number is given to each licensed frequency band. Such as band 1, band 2, band 3 … … band 40. For convenience of the following description, the corresponding frequency bands are denoted by the reference numerals of the frequency bands.

Please refer to fig. 4. Frequency band set G consisting of first 13 power authorized frequency bands in 40 power authorized frequency bands ₁1.. 13 }. Middle 13 electric power authorized frequency bands form a frequency band set G ₂14.. 26 }. The last 14 power authorized frequency bands form a frequency band set G₃＝{j|j＝27，...40}。

As can be seen from fig. 4, each set of frequency bands in the set of frequency bands includes at least two frequency bands, and any two frequency bands in the at least two frequency bands are not adjacent to each other.

After the base station groups the 40 power authorized frequency bands, the base station uses a binary bit map to represent various combinations of the three groups of frequency band sets, and uses at least two bits in the binary bit map to represent various combinations of specific frequency band sets. It will be appreciated that the bits used by the base station are related to the number of packets. If the base station divides the 40 power authorized frequency bands into two groups, the base station uses 2 bits to represent various combinations of the frequency band sets; if the base station groups the 40 power grant bands into three groups, the base station uses 3 bits to represent various combinations of band sets. The specific meanings are shown in Table 1.

TABLE 1 multiple combinations of frequency band sets represented by three-bit two-level bit map

8 combination	Means of
		000	Access barring
001	G₁Group band optimization
		010	G₂Group band optimization
011	G₁Group and G₂Group frequency band is all excellent
		100	G₃Group band optimization
101	G₁Group and G₃Group frequency band is all excellent
		110	G₂Group and G₃Group frequency band is all excellent
111	G₁Group G₂Group and G₃Group frequency band is all excellent

In table 1, 000 indicates an access barring function, that is, when the first frequency band set is an empty set, the terminal is barred from accessing the base station, and the function is indicated by 1 bit originally in the system broadcast signal. In the embodiment of the invention, the base station represents the function through 000, and 1 bit in the broadcast signal of the original system can be saved. Therefore, the base station only needs to reserve 2 bits in practice to represent various combinations of the three sets of frequency bands in table 1.

And the base station calculates the noise interference value of each frequency band in each group of frequency band sets and determines the numerical value of the frequency band of which the noise interference value is smaller than a preset threshold value 1 in each group of frequency band sets. And the base station takes the frequency band set with the number greater than the preset threshold value 2 as a first frequency band set. In the present example, if G₁The number of frequency bands in the set smaller than the threshold 1 is smaller than the threshold 2, G₂The number of frequency bands smaller than the threshold value 1 in the set is larger than the threshold value 2, G₃The number of frequency bands in the set smaller than the threshold 1 is larger than the threshold 2. The base station determines the frequency bands in the G set as interference frequency bands, determines the G set as an interference frequency band set, and determines the G set as an interference frequency band set₂Set and G₃Set as a first set of frequency bands

G is to be₂Frequency band included in set and G₃The set includes a frequency band as the first frequency band. Namely, it is

The base station obtains the representation from table 1

Corresponding bit "110" and carrying the bit "110" as the first indication information in the system broadcast signal.

Please refer to fig. 5. The base station transmits a system broadcast signal to the terminal. It will be appreciated that the base station transmits system broadcast signals to a plurality of terminals within its cell coverage area. In the embodiment of the present invention, a base station is described as an example of transmitting a system broadcast signal to two terminals.

Please refer to fig. 6. After receiving the base station system broadcast signal, the terminal 1 acquires first indication information from the system broadcast signal. Determining a first frequency band set corresponding to the indication according to the first indication information

And determining the first frequency band set according to the corresponding relation between the first indication information included in the notification message sent by the base station and each combination mode in the multiple combination modes of at least one group of frequency band sets

The frequency bands included are { j | j ═ 14.. 40}, i.e., 27 frequency bands.

In one implementation, the terminal 1 calculates an SINR value of the terminal 1 receiving the downlink signal transmitted by the base station at each frequency band included in the first set of frequency bands. The terminal 1 sorts the calculated 27 SINR values. According to the sorting result, the terminal 1 compares each SINR value with a preset threshold value 3 (for example, the threshold value 3 is-20 dB), and acquires a plurality of SINR values not less than the threshold value 3 (for example, 10 SINR values not less than the threshold value 3). The terminal 1 sets 10 frequency bands (for example, the frequency bands 31 to 40) corresponding to the 10 SINR values as the second frequency band. The terminal 1 also groups the 10 second frequency bands into a second set of frequency bands.

After receiving the base station system broadcast signal, the terminal 2 acquires the first indication information from the system broadcast signal. Determining a first frequency band set corresponding to the indication according to the first indication information

To obtain { j | j ═ 14,. 40} or 27 bins.

In one implementation, the terminal 2 calculates an SINR value of the terminal 2 receiving the downlink signal transmitted by the base station at each frequency band included in the first set of frequency bands. The terminal 2 sorts the calculated 27 SINR values. According to the sorting result, the terminal 2 compares each SINR value with a preset threshold value 4 (for example, the threshold value 4 is-15 dB), and acquires a plurality of SINR values not less than the threshold value 4 (for example, 10 SINR values not less than the threshold value 4). The terminal 2 sets 10 frequency bands (for example, the frequency bands 26 to 35) corresponding to the 10 SINR values as the second frequency band. The terminal 2 also groups the 10 second frequency bands into a second set of frequency bands.

It is understood that the preset threshold 3 and the preset threshold 4 may be different thresholds, because the terminals are located at different positions in the cell and each terminal is at a different distance from the interference source and thus is interfered by different degrees. However, in practical applications, the preset threshold 3 and the preset threshold 4 may be the same threshold. After determining the respective second frequency band set, the terminal selects any second frequency band from at least one second frequency band included in the second frequency band set, and sends the uplink random access signal in the subcarrier corresponding to the any second frequency band. And the base station receives an uplink random access signal sent by the terminal.

As can be seen from the foregoing examples, each terminal-determined second frequency band set includes at least one second frequency band that is not only an uplink preferred frequency band determined by the base station but also a downlink preferred frequency band determined by the terminal. Any second frequency band selected by the terminal in the second frequency band set is a bidirectional preferred frequency band of the base station and the terminal. And sending the uplink random access signal in the subcarrier corresponding to any second frequency band, thereby realizing the optimization of the base station and the terminal to the channel and improving the quality and the detection rate of receiving the uplink random access signal.

And avoiding that different terminals with similar second frequency band sets select the sub-carriers corresponding to the same frequency band to send uplink random access signals to the base station. In one implementation manner, different terminals randomly select any frequency band in the second frequency band set of the terminals to transmit the uplink random access signal, so that the collision probability of the uplink random access signal is reduced.

Referring to the foregoing example, 5 bands of bands 31-35 exist in the second band set of each of the terminal 1 and the terminal 2. However, if the terminal 1 and the terminal 2 can randomly select one frequency band in the second frequency band set of the terminal 1 and the terminal 2, the probability that the terminal 1 and the terminal 2 simultaneously select the same frequency band is reduced. If the terminal 1 randomly selects the frequency band 35 to transmit the uplink random access signal, and the terminal 2 randomly selects the frequency band 27 to transmit the uplink random access signal.

In another implementation manner, the terminal calculates the SINR value of the downlink signal transmitted by the base station at each second frequency band. The terminal sorts the plurality of SINR values. And according to the sequencing result, the terminal takes the frequency band corresponding to the maximum value of the SINR value as the frequency band for sending the uplink random access signal, and sends the uplink random access signal to the base station in the subcarrier corresponding to the frequency band.

Referring to the foregoing example, the terminal 1 calculates an SINR value at which the terminal 1 receives a downlink signal transmitted by the base station at each second frequency band (e.g., frequency band 31-frequency band 40). Terminal 1 obtains 10 SINR values. Terminal 1 orders the 10 SINR values. According to the ranking result, the terminal 1 sets the frequency band (for example, the frequency band 35) corresponding to the maximum SINR value as the frequency band for transmitting the uplink random access signal, and transmits the uplink random access signal to the base station in the subcarrier corresponding to the frequency band.

The terminal 2 calculates an SINR value at which the terminal 2 receives a downlink signal transmitted by the base station at each second frequency band (e.g., frequency band 26-frequency band 35). Terminal 2 obtains 10 SINR values. Terminal 2 orders the 10 SINR values. According to the ranking result, the terminal 2 sets the frequency band (for example, the frequency band 27) corresponding to the maximum SINR value as the frequency band for transmitting the uplink random access signal, and transmits the uplink random access signal to the base station in the subcarrier corresponding to the frequency band.

After receiving an uplink random access signal sent by a terminal, a base station determines a frequency band for sending the uplink random access signal. And after determining the frequency band, the base station records the corresponding relation between the frequency band and the terminal. In subsequent communication with the terminal, the base station takes the frequency band as a frequency band for communication with the terminal (the communication comprises uplink communication and downlink communication).

Referring to the foregoing example, after receiving the uplink random access signal sent by the terminal 1, the base station determines the frequency band 35 as the frequency band where the terminal 1 sends the uplink random access signal. The terminal records the correspondence between the frequency band 35 and the terminal 1. I.e. frequency band 35, is a bi-directional preferred frequency band for terminal 1, and therefore the base station communicates subsequently with terminal 1 on the sub-carriers corresponding to frequency band 35. Similarly, after receiving the uplink random access signal sent by the terminal 2, the base station determines the frequency band 27 as the frequency band where the terminal 2 sends the uplink random access signal. The terminal records the correspondence between the frequency band 27 and the terminal 2. I.e. frequency band 27, is a bi-directional preferred frequency band for terminal 2, and therefore the base station communicates subsequently with terminal 2 on the sub-carriers corresponding to frequency band 27.

The content described in the foregoing embodiments can all implement the channel selection method, and accordingly, an embodiment of the present invention further provides a channel selection apparatus, so as to implement the channel selection method provided in the foregoing embodiments, as shown in fig. 7, the apparatus includes: a transmitting unit 710 and a receiving unit 720.

The transmitting unit 710 is configured to transmit a system broadcast signal to a terminal; the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one group of first frequency band sets, where the first frequency band set includes at least one first frequency band, and the at least one group of first frequency band sets is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets;

a receiving unit 720, configured to receive an uplink random access signal sent by the terminal, where the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band;

Further, the apparatus further comprises: a grouping unit 730, configured to perform grouping processing on all authorized frequency bands to obtain at least two groups of frequency band sets; the authorized frequency band is a frequency band allocated to the device and the terminal for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent;

a establishing unit 740, configured to form multiple combination manners including at least one group of frequency band sets according to the at least two groups of frequency band sets, where the base station establishes a corresponding relationship between the first indication information and each combination manner in the multiple combination manners;

the sending unit 710 is further configured to send a notification message to the terminal, where the notification message is used to inform the terminal of the correspondence.

Further, the apparatus further comprises: a determining unit 750, configured to determine a number of frequency bands in each group of frequency band sets, where a noise interference value of the frequency band is smaller than a preset first threshold;

a forming unit 760, configured to use a frequency band set corresponding to the number greater than a preset second threshold as the first frequency band set;

a generating unit 770, configured to generate the first indication information according to the first frequency band set and the corresponding relationship, where a frequency band set included in a combination manner corresponding to the first indication information is the same as the first frequency band set.

Further, the apparatus further comprises: the processing unit 780 is configured to use the any second frequency band of the uplink random access signal sent by the terminal as a communication frequency band for communicating with the terminal.

Further, the second frequency band is specifically a frequency band corresponding to an SINR value of a signal to interference plus noise ratio SINR value not less than a preset third threshold in all frequency bands included in the at least one group of first frequency band sets.

Further, all bands included in the at least one first set of bands are power licensed bands.

Therefore, by applying the channel selection apparatus provided by the embodiment of the present invention, after determining the at least one set of first frequency band sets, the apparatus transmits a system broadcast signal to the terminal, where the system broadcast signal includes first indication information for indicating the at least one set of first frequency band sets. And the terminal determines at least one second frequency band from all the frequency bands included in at least one group of first frequency band set indicated by the first indication information according to the first indication information. And the terminal sends the uplink random signal to the device through a subcarrier corresponding to any one of the at least one second frequency band, so that the device takes the frequency band for sending the uplink random signal as a communication frequency band for communicating with the terminal. The base station and the terminal can simultaneously select the channel in two directions, the anti-interference capability of the communication system is improved, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are also improved.

The content described in the foregoing embodiments can all implement a channel selection method, and accordingly, another channel selection apparatus is further provided in an embodiment of the present invention to implement the channel selection method provided in the foregoing embodiments, as shown in fig. 8, the apparatus includes: a receiving unit 810, a determining unit 820 to transmit the receiving unit 830.

The receiving unit 810 is configured to receive a system broadcast signal sent by a base station, where the system broadcast signal includes first indication information;

a determining unit 820, configured to determine, according to the first indication information, at least one group of first frequency band sets indicated by the first indication information correspondingly, where the first frequency band set includes at least one first frequency band, and the first frequency band is a frequency band determined by the base station and available for communicating with the terminal;

the determining unit 820 is further configured to determine at least one second frequency band from all frequency bands included in the at least one first set of frequency bands;

a sending unit 830, configured to send an uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band.

Further, the receiving unit 810 is further configured to receive a notification message sent by the base station;

the determining unit 820 is further configured to determine, according to the notification message, a corresponding relationship between the first indication information and each of multiple combination manners formed by at least two sets of frequency band sets, where the multiple combination manners include at least one set of frequency band set;

the determining unit 820 is specifically configured to determine, according to the first indication information and the corresponding relationship, at least one group of first frequency band sets indicated by the first indication information;

Further, the first frequency band set is specifically a frequency band set in which the noise interference value of the frequency band in each group of frequency band sets is smaller than the number of frequency bands of a preset first threshold, and the number is greater than a preset second threshold.

Further, the determining unit 820 is specifically configured to calculate a signal to interference plus noise ratio, SINR, value of the apparatus receiving the downlink signal transmitted by the base station at each frequency band included in the at least one first set of frequency bands;

Further, the transmitting unit 830 is specifically configured to randomly select any frequency band from the at least one second frequency band, and transmit the uplink random access signal to the base station through a randomly selected subcarrier of any frequency band;

alternatively, the first and second electrodes may be,

the sending unit 830 is specifically configured to calculate a signal to interference plus noise ratio SINR value of the downlink signal sent by the base station and received by the apparatus at each of the second frequency bands;

Therefore, by applying the channel selection apparatus provided by the embodiment of the present invention, after determining at least one set of first frequency band sets, the base station transmits a system broadcast signal to the apparatus, where the system broadcast signal includes first indication information for indicating at least one set of first frequency band sets. The device determines at least one second frequency band from all frequency bands included in at least one group of first frequency band sets indicated by the first indication information according to the first indication information. The device sends the uplink random signal to the base station through the subcarrier corresponding to any one of the at least one second frequency band, so that the base station takes the frequency band for sending the uplink random signal as a communication frequency band for communicating with the device. The base station and the terminal can simultaneously select the channel in two directions, the anti-interference capability of the communication system is improved, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are also improved.

In addition, an embodiment of the present invention further provides a base station, configured to implement the channel selection method in the foregoing embodiment of the present invention, as shown in fig. 9, where the base station includes: a receiver 910, a processor 920, a transmitter 930, and a memory 940. The receiver 910, the processor 920, the transmitter 930, and the memory 940 are connected to each other by a bus 950; the bus 950 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus.

The receiver 910 and the transmitter 930 are communication interfaces for the apparatus to perform communication interaction with other devices. May be a wired communication access port, a wireless communication interface, or a combination thereof, wherein the wired communication interface may be, for example, an ethernet interface. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The Wireless communication interface may be a Wireless Local Area Network (WLAN) interface, a cellular network communication interface, or a combination thereof.

The processor 920 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.

The processor 920 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

The memory 940 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (such as a flash memory), a hard disk (HDD) or a Solid State Drive (SSD); memory 740 may also include a combination of the above types of memories.

Optionally, the memory 940 may also be used to store program instructions, and when the processor 920 is a CPU, the processor 920 calls the program instructions stored in the memory 940; when the processor 920 is hardware such as an FPGA or an ASIC, the processor 920 does not need the memory 940 to store program instructions, and a technician can directly write the program instructions into the hardware processor of the FPGA or the ASIC, and the FPGA or the ASIC can directly execute the program instructions.

The program instructions may implement one or more steps in the embodiments shown in fig. 2-6, or alternative embodiments thereof, so that the data updating apparatus implements the functions of the data updating in the above-described method.

In this embodiment of the present invention, the processor 920 is configured to generate a system broadcast signal, and transmit the system broadcast signal to the transmitter 930, where the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one first frequency band set, where the first frequency band set includes at least one first frequency band, and the at least one first frequency band set is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one first frequency band set;

a transmitter 930 configured to receive the system broadcast signal transmitted by the processor 920 and transmit the system broadcast signal to a terminal;

a receiver 910, configured to receive an uplink random access signal sent by the terminal, and transmit the uplink random access signal to the processor 920, where the uplink random access signal is sent by the terminal through a subcarrier corresponding to any one of the at least one second frequency band;

the processor 920 is further configured to receive the uplink random access signal transmitted by the receiver 910;

Further, the processor 920 is further configured to perform grouping processing on all authorized frequency bands to obtain at least two groups of frequency band sets; the authorized frequency band is a frequency band allocated to the base station and the terminal for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent;

generating a notification message for informing the terminal of the correspondence, and transmitting the notification message to the transmitter 930;

the transmitter 930 is further configured to receive the notification message transmitted by the processor 920, and transmit the notification message to the terminal.

Further, the processor 920 is further configured to determine a number of frequency bands in each group of frequency band sets, where a noise interference value of the frequency band is smaller than a preset first threshold;

Further, the processor 920 is further configured to use the any second frequency band of the uplink random access signal sent by the terminal as a communication frequency band for communicating with the terminal.

Therefore, by applying the base station provided by the embodiment of the present invention, after determining at least one set of first frequency band sets, the base station sends a system broadcast signal to the terminal, where the system broadcast signal includes first indication information for indicating at least one set of first frequency band sets. And the terminal determines at least one second frequency band from all the frequency bands included in at least one group of first frequency band set indicated by the first indication information according to the first indication information. And the terminal sends the uplink random signal to the base station through the subcarrier corresponding to any one of the at least one second frequency band, so that the base station takes the frequency band for sending the uplink random signal as a communication frequency band for communicating with the terminal. The base station and the terminal can simultaneously select the channel in two directions, the anti-interference capability of the communication system is improved, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are also improved.

In addition, an embodiment of the present invention further provides a terminal, configured to implement the channel selection method in the foregoing embodiment of the present invention, as shown in fig. 10, where the terminal includes: a receiver 1010, a processor 1020, a transmitter 1030, and a memory 1040. The receiver 1010, processor 1020, transmitter 1030, and memory 1040 are interconnected by a bus 1050.

The receiver 1010, the processor 1020, the transmitter 1030, the memory 1040 and the bus 1050 are the same in construction and type as those of each component included in the base station in the foregoing embodiment, and will not be repeated here.

In this embodiment of the present invention, the receiver 1010 is configured to receive a system broadcast signal sent by a base station, where the system broadcast signal includes first indication information;

a processor 1020, configured to receive the system broadcast signal transmitted by the receiver 1010, and determine, according to the first indication information, at least one group of first frequency band sets indicated by the first indication information correspondingly, where the first frequency band set includes at least one first frequency band, and the first frequency band is a frequency band determined by the base station and available for communication with the terminal;

the processor 1020 is further configured to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency bands, select any one second frequency band from the at least one second frequency band, and transmit an identifier of the any one second frequency band to the transmitter 1030;

a transmitter 1030, configured to receive the identifier of any second frequency band transmitted by the processor 1020, and send an uplink random access signal to the base station on a subcarrier corresponding to any second frequency band through the identifier of any second frequency band.

Further, the receiver 1010 is further configured to receive a notification message sent by the base station and transmit the notification message to the processor 1020;

the processor 1020 is further configured to receive the notification message transmitted by the receiver 1010, and determine, according to the notification message, a correspondence relationship between the first indication information and each of multiple combination modes, which are formed by at least two sets of frequency band sets and include at least one set of frequency band set;

the processor 1020 is specifically configured to determine, according to the first indication information and the corresponding relationship, at least one group of first frequency band sets indicated by the first indication information;

Further, the processor 1020 is specifically configured to calculate a signal to interference plus noise ratio, SINR, value of the terminal receiving the downlink signal sent by the base station at each frequency band included in the at least one first set of frequency bands;

Further, the processor 1020 is specifically configured to randomly select any frequency band from the at least one second frequency band, and transmit an identifier of the randomly selected any frequency band to the transmitter 1030;

alternatively, the first and second electrodes may be,

and transmitting the identifier of the frequency band corresponding to the maximum SINR value to the transmitter 1030.

Therefore, by applying the terminal provided by the embodiment of the present invention, after determining at least one set of first frequency band sets, the base station sends a system broadcast signal to the terminal, where the system broadcast signal includes first indication information for indicating at least one set of first frequency band sets. And the terminal determines at least one second frequency band from all the frequency bands included in at least one group of first frequency band set indicated by the first indication information according to the first indication information. And the terminal sends the uplink random signal to the base station through the subcarrier corresponding to any one of the at least one second frequency band, so that the base station takes the frequency band for sending the uplink random signal as a communication frequency band for communicating with the terminal. The base station and the terminal can simultaneously select the channel in two directions, the anti-interference capability of the communication system is improved, and the quality of receiving the uplink random access signal and the detection rate of the uplink random access signal are also improved.

Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. 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 invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like, which are within the principle of the present invention, should be included in the scope of the present invention.

Claims

1. A method for channel selection, the method comprising:

the base station sends a system broadcast signal to the terminal; the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one group of first frequency band sets, where the first frequency band set includes at least one first frequency band, and the at least one group of first frequency band sets is used for the terminal to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets, where the first frequency band is a frequency band that can be used for communication with the terminal;

before the base station sends a system broadcast signal to a terminal, the method includes:

the base station sends a notification message to the terminal, wherein the notification message is used for informing the terminal of the corresponding relationship;

after the base station sends the notification message to the terminal, the method includes:

the base station determines the first frequency band set, and generates the first indication information according to the first frequency band set and the corresponding relation, wherein the frequency band set included in the combination mode corresponding to the first indication information is the same as the first frequency band set.

2. The method of claim 1, wherein the base station determines the first set of frequency bands, comprising:

and the base station takes the frequency band set corresponding to the frequency band set with the number greater than a preset second threshold value as the first frequency band set.

3. The method of claim 1, wherein after the base station receives the uplink random access signal transmitted by the terminal, the method comprises:

4. The method according to claim 1, wherein the second frequency band is specifically a frequency band corresponding to an SINR value of not less than a preset third threshold among all frequency bands included in the at least one group of first frequency band sets.

5. The method according to any of claims 1-3, wherein all bands included in the at least one first set of bands are power licensed bands.

6. A method for channel selection, the method comprising:

the terminal sends an uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band;

before the terminal receives a system broadcast signal sent by a base station, the method includes:

the terminal receives a notification message sent by the base station;

the at least two groups of frequency band sets are obtained by grouping all authorized frequency bands by the base station, the authorized frequency bands are frequency bands which are allocated to the terminal and the base station for communication transmission, each group of frequency band set in the at least two groups of frequency band sets comprises at least two frequency bands, and any two frequency bands in the at least two frequency bands are not adjacent;

and the first indication information is generated by the base station according to the first frequency band set and the corresponding relation.

7. The method according to claim 6, wherein the first frequency band set is specifically a frequency band set in which a noise interference value of a frequency band in each group of frequency band sets is smaller than a number of frequency bands of a preset first threshold, and the number of frequency bands is larger than a preset second threshold.

8. The method according to claim 6, wherein the terminal determines at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets, and specifically includes:

9. The method according to claim 6, wherein the terminal sends the uplink random access signal to the base station through a subcarrier corresponding to any one of the at least one second frequency band, specifically including:

alternatively, the first and second electrodes may be,

10. The method according to any of claims 6-9, wherein all bands included in the at least one first set of bands are power licensed bands.

11. A base station, characterized in that the base station comprises:

a processor, configured to generate a system broadcast signal, and transmit the system broadcast signal to a transmitter, where the system broadcast signal includes first indication information, where the first indication information is used to indicate at least one group of first frequency band sets, where the first frequency band set includes at least one first frequency band, and the at least one group of first frequency band sets is used for a terminal to determine at least one second frequency band from all frequency bands included in the at least one group of first frequency band sets;

the first frequency band is a frequency band which can be used for communicating with the terminal;

the processor is further configured to group all authorized frequency bands to obtain at least two groups of frequency band sets; the authorized frequency band is a frequency band allocated to the base station and the terminal for communication transmission, each set of the at least two sets of frequency band sets comprises at least two frequency bands, and any two frequency bands of the at least two frequency bands are not adjacent;

the sender is further configured to receive the notification message transmitted by the processor, and send the notification message to the terminal;

the processor is further configured to determine the first frequency band set, and generate the first indication information according to the first frequency band set and the correspondence, where a frequency band set included in a combination manner corresponding to the first indication information is the same as the first frequency band set.

12. The base station of claim 11, wherein the processor is further configured to determine a number of frequency bands in each set of frequency bands for which a noise interference value of the frequency band is smaller than a preset first threshold;

and taking the frequency band set corresponding to the frequency band set with the number larger than a preset second threshold value as the first frequency band set.

13. The base station of claim 11, wherein the processor is further configured to use any one of the second frequency bands for the terminal to transmit the uplink random access signal as a communication frequency band for communicating with the terminal.

14. The base station according to claim 11, wherein the second frequency band is specifically a frequency band corresponding to an SINR value of not less than a preset third threshold among all frequency bands included in the at least one group of first frequency band sets.

15. The base station according to any of claims 11-14, wherein all frequency bands included in said at least one first set of frequency bands are power licensed frequency bands.

16. A terminal, characterized in that the terminal comprises:

a transmitter, configured to receive the identifier of any second frequency band transmitted by the processor, and send an uplink random access signal to the base station on a subcarrier corresponding to any second frequency band through the identifier of any second frequency band;

the receiver is further configured to receive a notification message sent by the base station and transmit the notification message to the processor;

the processor is specifically configured to determine, according to the first indication information and the correspondence, at least one group of first frequency band sets indicated by the first indication information;

17. The terminal according to claim 16, wherein the first frequency band set is specifically a frequency band set in which a noise interference value of a frequency band in each frequency band set is smaller than a number of frequency bands of a preset first threshold, and the number of frequency bands is larger than a preset second threshold.

18. The terminal of claim 16, wherein the processor is specifically configured to calculate a signal to interference plus noise ratio SINR value at each frequency band included in the at least one first set of frequency bands for the terminal to receive downlink signals transmitted by the base station;

19. The terminal of claim 16, wherein the processor is specifically configured to randomly select any one of the at least one second frequency band, and to transmit an identification of any one of the randomly selected frequency bands to the transmitter;

alternatively, the first and second electrodes may be,

the processor is specifically configured to calculate a signal to interference plus noise ratio SINR value of the downlink signal sent by the base station and received by the terminal at each of the second frequency bands;

20. The terminal according to any of claims 16-19, wherein all frequency bands included in the at least one first set of frequency bands are power licensed frequency bands.

21. A computer-readable storage medium storing a program, characterized in that the program comprises instructions for performing the method of any of claims 1-5.

22. A computer-readable storage medium storing a program, characterized in that the program comprises instructions for performing the method of any of claims 6-10.