Bandwidth selection method and base station for citizens broadband radio service

Abstract

This invention provides a bandwidth selection method and a base station for citizen broadband radio services. The bandwidth selection method includes: receiving a spectrum resource configuration from a spectrum access system, wherein the spectrum resource configuration indicates at least one available frequency band, and the at least one available frequency band includes a priority access licensed frequency band or a normal licensed access frequency band; determining a selected bandwidth from the spectrum of citizen broadband radio services as the operating bandwidth of the base station, wherein the selected bandwidth includes part or all of the available frequency band; and selecting a candidate frequency band from the available frequency band within the selected bandwidth, and configuring the candidate frequency band to activate a portion of its bandwidth.

Description

Technical Field

[0001] This invention pertains to wireless communication technology and relates to a bandwidth selection method and base station for citizens' broadband radio service (CBRS). Background Technology

[0002] CBRS refers to the spectrum resources available in the United States ranging from 3550 to 3700 MHz, corresponding to the n48 band for 5G communication. CBRS spectrum resources can include basic channels (e.g., 10, 20, and 40 MHz) in Incumbent Uses (IU) bands, Priority Access Licenses (PAL) bands, and General Authorized Access (GAA) bands. Figure 1 As shown. Authorized users of the PAL band can obtain a maximum of one PAL band of 40MHz. General users can obtain one or more GAA bands. Unauthorized users of the PAL band can typically obtain one or more GAA bands totaling no more than 80MHz.

[0003] In a CBRS system, the spectrum resources available to users can comprise multiple non-contiguous frequency bands, and the allocation of these bands is often unpredictable. Base stations need to employ multi-cell or carrier-aggregation technologies to effectively utilize these frequency bands. Compared to using single-cell technologies, the hardware and deployment costs of base stations will increase.

[0004] Therefore, how to effectively utilize multiple discontinuous frequency bands within a single cell is one of the important issues in this field. Summary of the Invention

[0005] This invention proposes a bandwidth selection method and base station for citizen broadband radio services, which can effectively utilize the discontinuous frequency bands of the CBRS system.

[0006] This invention relates to a bandwidth selection method for citizen broadband radio services. The bandwidth selection method is applicable to a base station and includes: receiving a spectrum resource configuration from a spectrum access system, wherein the spectrum resource configuration indicates at least one available frequency band, the at least one available frequency band including a priority access licensed frequency band or a normal licensed access frequency band; determining a selected bandwidth from the spectrum of the citizen broadband radio service as the operating bandwidth of the base station, wherein the selected bandwidth includes part or all of the available frequency band; and selecting a candidate frequency band from the available frequency band within the selected bandwidth, and configuring the candidate frequency band to activate a portion of its bandwidth.

[0007] This invention relates to a base station comprising a transceiver and a processor. The transceiver receives a spectrum resource configuration from a spectrum access system, wherein the spectrum resource configuration indicates at least one available frequency band, the at least one available frequency band including a priority access licensed frequency band or a normal licensed access frequency band. The processor is coupled to the transceiver and configured to perform: determining a selected bandwidth from the spectrum of citizen broadband radio services as the operating bandwidth of the base station, wherein the selected bandwidth includes part or all of the available frequency band; and selecting candidate frequency bands from the available frequency bands within the selected bandwidth, and configuring the candidate frequency bands to activate a portion of the bandwidth.

[0008] Based on the above, the base station of the present invention can utilize the existing multi-part bandwidth technology of the 5G standard to achieve effective utilization of CBRS spectrum resources, thus reducing the hardware and deployment costs of the base station. Attached Figure Description

[0009] Figure 1 A schematic diagram showing the spectrum resources for citizen bandwidth radio services;

[0010] Figure 2 A flowchart of a bandwidth selection method for CBRS is shown according to an embodiment of the present invention;

[0011] Figure 3 A flowchart illustrating a detailed implementation of step S202 is shown according to an embodiment of the present invention;

[0012] Figure 4 A flowchart of a method for updating available frequency band information is shown according to an embodiment of the present invention;

[0013] Figure 5 A flowchart of a method for comparing the priorities of a first consecutive bandwidth and a second consecutive bandwidth is shown according to an embodiment of the present invention;

[0014] Figure 6 An embodiment of the present invention illustrates a signaling diagram for switching a user equipment from a first candidate frequency band to a second candidate frequency band;

[0015] Figure 7 A schematic diagram of a network node is shown according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures

[0017] 61, 700: Base stations;

[0018] 62: Central Unit;

[0019] 63: Distribution unit;

[0020] 64: User equipment;

[0021] 710: Processor;

[0022] 720: Storage medium;

[0023] 730: Transceiver;

[0024] S201, S202, S203, S204, S301, S302, S303, S304, S305, S401, S402, S403, S404, S405, S406, S407, S501, S502, S503, S504, S505, S506, S507, S508, S601, S602, S603, S604, S605, S606, S607, S608, S609, S610, S611, S612: Steps. Detailed Implementation

[0025] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same component reference numerals are used in the drawings and description to denote the same or similar parts.

[0026] Figure 2 A flowchart of a bandwidth selection method for CBRS is shown according to an embodiment of the present invention. Figure 2 Each step can be implemented by the base station. The base station can be a NodeB, eNB, or gNB, and in some embodiments, the base station may further include a Centralized Unit (CU) or a Distributed Unit (DU), etc., but the present invention is not limited thereto.

[0027] In step S201, the base station receives a spectrum resource configuration from the Spectrum Access System (SAS), wherein the spectrum resource configuration indicates at least one available frequency band, which includes a priority access licensed frequency band or a normal licensed access frequency band. Next, in step S202, the base station determines a selected bandwidth from the spectrum of the Citizen Broadband Radio Service (CBRS) as the base station's operating bandwidth, wherein the selected bandwidth includes part or all of the available frequency bands. Then, in step S203, the base station selects candidate frequency bands from the available frequency bands within the selected bandwidth. Furthermore, in step S204, the base station configures the candidate frequency bands to activate a portion of the bandwidth. Specifically, in step S201, the base station may receive a spectrum resource configuration from the Spectrum Access System (SAS). The spectrum resource configuration can be used to indicate the CBRS spectrum (i.e., such as...). Figure 1One or more available frequency bands (3550MHz to 3700MHz) are shown. In this invention, a frequency band [x,y] (or bandwidth [x,y]) can be used to represent an available frequency band indicated by a spectrum resource configuration, where x is the starting frequency of the frequency band (in MHz) and y is the ending frequency of the frequency band (in MHz). The spectrum resource configuration can also indicate whether each available frequency band belongs to a PAL band or a GAA band.

[0028] Generally, system operators (e.g., base station owners) can pre-register / lease a fixed-width PAL band, such as 40MHz, from the spectrum access system administrator. When a base station transmits a request to the SAS, the spectrum resource configuration returned by the SAS indicates the start and end frequencies of this 40MHz PAL band. On the other hand, since the use of spectrum in the CBRS has different priority levels, the GAA band in the spectrum resource configuration returned by the SAS refers to the frequency band within the CBRS spectrum that is still unoccupied and available for base station use when the base station transmits a request to the SAS. For example, the GAA band could be part or all of the frequency band in the CBRS spectrum that is not occupied by existing access bands or PAL bands at the time the SAS receives the request. Depending on the actual usage, the available frequency bands indicated by the spectrum resource configuration may be one or more consecutive or discontinuous frequency bands. In some practical situations, even if the base station operator has pre-registered and obtained a 40MHz frequency band, the available frequency bands assigned by the SAS may still be multiple discontinuous available frequency bands totaling 40MHz. In some practical situations, the available frequency bands in the CBRS spectrum indicated by the spectrum resource configuration will change over time, and the base station must periodically obtain the spectrum resource configuration from the SAS to obtain the corresponding available frequency band information. In other words, the location of a pre-approved 40MHz PAL frequency band in the CBRS spectrum may be multiple discontinuous available frequency bands, and may also change over time.

[0029] Table 1 shows examples of available frequency bands indicated by spectrum resource configurations. For example, the spectrum resource configuration received by the base station from the SAS can be one of spectrum resource configurations #1 to #6 in Table 1. Taking spectrum resource configuration #4 in Table 1 as an example, spectrum resource configuration #4 can, for example, indicate that the available frequency bands include band [3550, 3650] (i.e., band 3550-3650MHz) and band [3660, 3700] (i.e., band 3660-3700MHz). In some embodiments, spectrum resource configuration #4 can further indicate that the available frequency band [3550, 3650] is a PAL band and the available frequency band [3660, 3700] is a GAA band.

[0030] Table 1

[0031] Index of spectrum resource configuration SAS provides one or more available frequency bands #1 [0,0] #2 [3550,3700] #3 [3560,3700] #4 [3550,3650],[3660,3700] #5 [3550,3560],[3570,3590],[3600,3650] #6 [3550,3560],[3570,3600],[3600,3670] #7 [3550,3560],[3580,3600],[3600,3650],[3660,3700] … …

[0032] Generally, a base station can set the transmission frequency of uplink and / or downlink signals within its operating bandwidth to communicate with user equipment within its signal coverage area. In step S202, the base station can determine a selected bandwidth from the CBRS spectrum as its operating bandwidth. In some practical applications, the preset width of the base station's cell bandwidth is 100MHz, and the aforementioned operating bandwidth can be set to a continuous 100MHz band in the CBRS spectrum to match the cell bandwidth width. In some embodiments, the base station can further divide this operating bandwidth into one or more Bandwidth Parts (BWPs), allowing the base station to communicate with user equipment more flexibly in a resource-saving and bandwidth-saving manner.

[0033] In simple terms, partial bandwidth is a technology used in 5G systems. Generally, partial bandwidth divides a large bandwidth into multiple smaller, time-divided bandwidths. Each smaller bandwidth can have different parameter configurations to accommodate different types of terminals (e.g., user equipment served by the base station) and service requirements. The benefits of partial bandwidth include reduced terminal power consumption, improved spectrum utilization, and support for slicing in various scenarios. Overall, partial bandwidth is an important feature of flexible and scalable design in 5G systems.

[0034] Next, the selected bandwidth may include part or all of the available frequency bands indicated by the spectrum resource configuration. In most cases, the selected bandwidth should cover all available frequency bands indicated by the spectrum resource configuration as much as possible. Taking the spectrum resource configuration received by the base station as Spectrum Resource Configuration #5 in Table 1 as an example, if the selected bandwidth is set to [3550, 3650], then the selected bandwidth [3550, 3650] covers all the available frequency bands indicated by Spectrum Resource Configuration #5 (i.e., available frequency bands [3550, 3560], [3570, 3590], and [3600, 3650]). Assuming the selected bandwidth is [3560, 3660], then the selected bandwidth [3560, 3660] only includes a portion of the available frequency bands indicated by Spectrum Resource Configuration #5 (i.e., available frequency bands [3570, 3590] and [3600, 3650]). In other words, within a 100MHz operating bandwidth of [3550, 3650], there are three discontinuous available frequency bands: 10MHz, 20MHz, and 50MHz; while within a 100MHz operating bandwidth of [3560, 3660], only two discontinuous available frequency bands, 20MHz and 50MHz, are available.

[0035] In order to maximize the available frequency bands covered in the selected bandwidth, in some embodiments, the base station may use a sliding window with a width equal to the cell bandwidth (e.g., 100MHz as above) to obtain multiple consecutive bandwidths from the CBRS spectrum, and select one of the multiple consecutive bandwidths as the selected bandwidth, which will be described in detail below with reference to the figures.

[0036] Figure 3 A flowchart illustrating a detailed implementation of step S202 according to an embodiment of the present invention is shown. In step S301, the base station can determine whether the sliding window exceeds the spectral range of the CBRS (i.e., 3550MHz to 3700MHz). If the sliding window exceeds the spectral range of the CBRS, then proceed to step S305. If the sliding window has not exceeded the spectral range of the CBRS, then proceed to step S302.

[0037] Specifically, the base station can store a pre-configured sliding window, which can be represented as [i,j], where i is the starting frequency (in MHz) of the sliding window and j is the ending frequency (in MHz) of the sliding window. The initial starting frequency, initial ending frequency, window size, or step size (i.e., the frequency width of each sliding window movement) of the sliding window can be pre-configured in the base station. For example, the window size can be pre-configured to 100MHz and the step size can be pre-configured to 5MHz. In some embodiments, if the starting frequency of the sliding window exceeds the spectral range of the CBRS (i.e., the starting frequency is less than or equal to 3550MHz or greater than or equal to 3700MHz), the base station can determine that the sliding window exceeds the spectral range of the CBRS. If the starting frequency of the sliding window does not exceed the spectral range of the CBRS (i.e., the starting frequency is greater than 3550MHz and less than 3700MHz), the base station can determine that the sliding window does not exceed the spectral range of the CBRS. In some embodiments, if the ending frequency of the sliding window exceeds the spectral range of the CBRS (i.e., the ending frequency is less than or equal to 3550MHz or greater than or equal to 3700MHz), the base station can determine that the sliding window exceeds the spectral range of the CBRS. If the ending frequency of the sliding window does not exceed the spectral range of the CBRS (i.e., the ending frequency is greater than 3550MHz and less than 3700MHz), the base station can determine that the sliding window does not exceed the spectral range of the CBRS.

[0038] In step S302, the base station can obtain the continuous bandwidth from the CBRS spectrum according to the sliding window. For example, at the first time point, the starting and ending frequencies of the sliding window are [3550, 3650], at which time the base station can obtain the continuous bandwidth with the starting and ending frequencies of [3550, 3650] (e.g., the first continuous bandwidth). Then, at the second time point, the sliding window moves to the position with the starting and ending frequencies of [3555, 3655], at which time the base station can obtain the continuous bandwidth with the starting and ending frequencies of [3555, 3655] (e.g., the second continuous bandwidth), and so on.

[0039] Next, in step S303, the base station can obtain available frequency band information of the continuous bandwidth based on the spectrum resource configuration detection and record the available frequency band information, wherein the available frequency band information is used to indicate the available frequency bands within the continuous bandwidth. Specifically, the base station can read the start frequency and end frequency of the continuous bandwidth, and can obtain the start frequency and end frequency of the available frequency band indicated by the spectrum resource configuration from the spectrum resource configuration. The available frequency bands within the continuous bandwidth indicated by the available frequency band information may include available frequency bands that partially overlap with the continuous bandwidth, or available frequency bands that are completely located within the continuous bandwidth. In some embodiments, the base station determines whether the available frequency band is located within this continuous bandwidth based on the start frequency of the available frequency band. That is, if the base station determines that the start frequency of an available frequency band is located between the start frequency and end frequency of the continuous bandwidth, the base station will record this available frequency band in the available frequency band information of this continuous bandwidth.

[0040] Taking spectrum resource configuration #6 in Table 1 as an example, assume the continuous bandwidth obtained by the sliding window is [3550, 3650]. Spectrum resource configuration #6 includes three available frequency bands: [3550, 3560], [3570, 3600], and [3600, 3670]. Based on the starting frequencies of these three available frequency bands (i.e., 3550, 3570, and 3600MHz), the base station can determine that all three available frequency bands are located within the continuous bandwidth [3550, 3650]. Therefore, the base station can record all three available frequency bands in the available frequency band information corresponding to the continuous bandwidth [3550, 3650]. In this way, the available frequency band information of the continuous bandwidth [3550, 3650] can indicate that the available frequency bands within the continuous bandwidth [3550, 3650] include available frequency bands [3550, 3560], available frequency bands [3570, 3600], and available frequency bands [3600, 3670]. It is worth noting that frequency bands [3550, 3560] and frequency bands [3570, 3600] are completely located within the continuous bandwidth [3550, 3650], while frequency bands [3600, 3670] partially overlap with the continuous bandwidth [3550, 3650].

[0041] In step S304, the base station can move the sliding window according to the step size of the sliding window. Assume the sliding window size is 100MHz and the step size is 5MHz. As explained above, the initial position of the sliding window is [3550, 3650]. The base station can move the sliding window from [3550, 3650] to [3555, 3655] by 5MHz according to the step size of 5MHz. After executing step S304, the base station re-executes step S301 to obtain the continuous bandwidth with a start frequency and an end frequency of [3555, 3655], and records the corresponding available frequency band information (steps S302-S303). Thus, before the sliding window exceeds the CBRS spectrum range, the base station can repeatedly execute steps S301 to S304 to obtain multiple continuous bandwidths and further obtain multiple available frequency band information corresponding to the multiple continuous bandwidths.

[0042] It should be noted that the present invention does not limit the direction of movement of the sliding window. In the above embodiments, the sliding window moves from a low frequency to a high frequency, but in some embodiments, the sliding window can also be set to move from a high frequency to a low frequency. In embodiments where the sliding window moves from a high frequency to a low frequency, the base station can also determine whether the available frequency band is located within this continuous bandwidth based on the end frequency of the available frequency band.

[0043] When the base station determines that the sliding window has exceeded the CBRS spectrum range (step S301, Yes), the base station may then execute step S305. At this time, the base station has obtained information on multiple consecutive bandwidths within the CBRS spectrum range and the available frequency bands corresponding to these consecutive bandwidths through the sliding window. In step S305, the base station may select one of the multiple consecutive bandwidths as the selected bandwidth based on the available frequency band information. The base station may obtain the available frequency bands within the selected bandwidth based on the available frequency band information corresponding to the selected bandwidth.

[0044] In some practical situations, the multiple available frequency bands included in the spectrum resource configuration received from SAS may actually be consecutive frequency bands that can be connected end-to-end. Additionally, via... Figure 3 The steps involved in obtaining the available frequency band information recorded in the corresponding continuous bandwidth may include some frequency bands that extend beyond this continuous bandwidth. Therefore, to address these issues, in some embodiments, before selecting a selected bandwidth from multiple continuous bandwidths, the base station may first update the available frequency band information for each continuous bandwidth, so that the base station can select the best one from the multiple continuous bandwidths as the selected bandwidth.

[0045] Figure 4 A flowchart of a method for updating available frequency band information is shown according to an embodiment of the present invention. Figure 4 The described steps and procedures can be used to achieve Figure 3Part of step S305. In step S401, the base station can detect one or more available frequency bands located within the continuous bandwidth based on the available frequency band information of the continuous bandwidth. In some embodiments, information related to the available frequency bands within this continuous bandwidth has been recorded in the available frequency band information corresponding to this continuous bandwidth (e.g., obtained and recorded via step S303 above), and the base station only needs to read the available frequency bands from the available frequency band information. In some embodiments, the base station can determine whether the available frequency band is located within the continuous bandwidth based on the start frequency of the available frequency band, the start frequency of the continuous bandwidth, and the end frequency of the continuous bandwidth. If the start frequency of the available frequency band is greater than or equal to the start frequency of the continuous bandwidth and less than or equal to the end frequency of the continuous bandwidth, the base station can determine that the available frequency band is located within the continuous bandwidth. If the start frequency of the available frequency band is less than the start frequency of the continuous bandwidth or greater than the end frequency of the continuous bandwidth, the base station can determine that the available frequency band is located outside the continuous bandwidth. Taking the available frequency band [3550, 3560] indicated by spectrum resource configuration #6 in Table 1 as an example, suppose the base station wants to determine whether the frequency band [3550, 3560] is located within the continuous bandwidth [3550, 3650]. Since the starting frequency of the frequency band [3550, 3560] is 3550MHz, which is greater than or equal to the starting frequency of the continuous bandwidth [3550, 3650] and less than or equal to the ending frequency of the continuous bandwidth [3550, 3650], which is 3650MHz, the base station can determine that the frequency band [3550, 3560] is located within the continuous bandwidth [3550, 3650].

[0046] In one embodiment, the base station can determine whether the available frequency band is located within the continuous bandwidth based on the end frequency of the available frequency band, the start frequency of the continuous bandwidth, and the end frequency of the continuous bandwidth. If the end frequency of the available frequency band is greater than or equal to the start frequency of the continuous bandwidth and less than or equal to the end frequency of the continuous bandwidth, the base station can determine that the available frequency band is located within the continuous bandwidth. If the end frequency of the available frequency band is less than the start frequency of the continuous bandwidth or greater than the end frequency of the continuous bandwidth, the base station can determine that the available frequency band is located outside the continuous bandwidth. Taking the available frequency band [3550, 3560] indicated by spectrum resource configuration #6 in Table 1 as an example, suppose the base station wants to determine whether the frequency band [3550, 3560] is located within the continuous bandwidth [3550, 3650]. Since the end frequency of frequency band [3550,3560] is 3560MHz, which is greater than or equal to the start frequency of continuous bandwidth [3550,3650] is 3550MHz, and less than or equal to the end frequency of continuous bandwidth [3550,3650] is 3650MHz, the base station can determine that frequency band [3550,3560] is located within continuous bandwidth [3550,3650].

[0047] In step S402, the base station can determine whether there are mutually matching available frequency bands within the continuous bandwidth. More specifically, the base station can determine whether there is a first available frequency band and a second available frequency band within the continuous bandwidth, wherein the ending frequency of the first available frequency band and the starting frequency of the second available frequency band match (e.g., the ending frequency of the first available frequency band and the starting frequency of the second available frequency band are the same). If the base station determines that there are mutually matching available frequency bands within the continuous bandwidth, it proceeds to step S403. If the base station determines that there are no mutually matching available frequency bands within the continuous bandwidth, it proceeds to step S404.

[0048] For example, suppose the spectrum resource configuration received from the SAS is spectrum resource configuration #6, with a continuous bandwidth frequency of [3550, 3650]. Within the continuous bandwidth [3550, 3650], there are available frequency bands [3550, 3560], [3570, 3600], and [3600, 3670]. Since the end frequency of the available frequency band [3570, 3600] (3600MHz) matches the start frequency of the available frequency band [3600, 3670], the base station can determine that there are matching available frequency bands within the continuous bandwidth [3550, 3650]. As another example, suppose the spectrum resource configuration received from the SAS is spectrum resource configuration #5, with the same continuous bandwidth frequency of [3550, 3650]. The continuous bandwidth [3550, 3650] encompasses the available frequency bands [3550, 3560], [3570, 3590], and [3600, 3650]. Since the end frequency (3560MHz) of the available frequency band [3550, 3560] does not match the start frequency (3570MHz) of the available frequency band [3570, 3590], and the end frequency (3590MHz) of the available frequency band [3570, 3590] does not match the start frequency (3600MHz) of the available frequency band [3600, 3650], the base station can determine that there are no matching available frequency bands within the continuous bandwidth [3550, 3650].

[0049] When matching available frequency bands exist within a continuous bandwidth, it means that these matching available frequency bands can be interconnected and can be considered as a single continuous available frequency band. In step S403, the base station can merge the matching available frequency bands into a new available frequency band. For example, suppose the spectrum resource configuration received by the base station from the SAS is spectrum resource configuration #6 in Table 1, and the current continuous bandwidth is set to [3550, 3650]. Based on the start and end frequencies of each available frequency band indicated by spectrum resource configuration #6, the base station can determine that there are matching available frequency bands [3570, 3600] and available frequency band [3600, 3670] within the continuous bandwidth [3550, 3650]. The base station can merge available frequency bands [3570, 3600] and available frequency band [3600, 3670] into a new available frequency band [3570, 3670].

[0050] In step S404, the base station can determine whether there is an available frequency band exceeding the range of the continuous bandwidth. If the base station determines that there is an available frequency band exceeding the range of the continuous bandwidth, it proceeds to step S405. If the base station determines that there is no available frequency band exceeding the range of the continuous bandwidth, it proceeds to step S406.

[0051] In some embodiments, the base station has already determined whether the available frequency band is within a continuous bandwidth based on the start frequency of the available frequency band in a previous step (e.g., step S303 or S401). Here, the base station can determine whether each available frequency band exceeds the range of the continuous bandwidth based on whether the end frequency of each available frequency band within the continuous bandwidth is greater than the end frequency of the continuous bandwidth. In some embodiments, the base station has already determined whether the available frequency band is within a continuous bandwidth based on the end frequency of the available frequency band in a previous step (e.g., step S303 or S401). Here, the base station can determine whether each available frequency band exceeds the range of the continuous bandwidth based on whether the start frequency of each available frequency band within the continuous bandwidth is less than the start frequency of the continuous bandwidth.

[0052] For example, suppose the base station receives spectrum resource configuration #6 from the SAS as shown in Table 1, and the current sliding window is moved to the frequency range of [3550, 3650] with a continuous bandwidth of [3550, 3650]. The base station can determine, based on the start and end frequencies of the continuous bandwidth [3550, 3650] and the start frequencies of each available frequency band in spectrum resource configuration #6, that the continuous bandwidth [3550, 3650] covers available frequency bands [3550, 3560], [3570, 3600], and [3600, 3670]. The base station can determine that the available frequency band [3600, 3670] exceeds the range of the continuous bandwidth [3550, 3650] if the end frequency of the available frequency band [3600, 3670] is greater than the end frequency of 3650MHz of the continuous bandwidth [3550, 3650].

[0053] In step S405, the base station can truncate available frequency bands that exceed the continuous bandwidth. Specifically, if the end frequency of the available frequency band is greater than the end frequency of the continuous bandwidth, the base station can update the end frequency of the available frequency band to the end frequency of the continuous bandwidth. On the other hand, if the start frequency of the available frequency band is less than the start frequency of the continuous bandwidth, the base station can update the start frequency of the available frequency band to the start frequency of the continuous bandwidth.

[0054] Continuing the example above, the base station determines that the available frequency band [3600, 3670] exceeds the range of the continuous bandwidth [3550, 3650] because the ending frequency of the available frequency band [3600, 3670] is greater than the ending frequency of the continuous bandwidth [3550, 3650] (3650MHz). Specifically, since the ending frequency of the available frequency band [3600, 3670] (3670MHz) is greater than the ending frequency of the continuous bandwidth [3550, 3650] (3650MHz), the base station can update the ending frequency of the available frequency band [3600, 3670] (3670MHz) to the ending frequency of the continuous bandwidth [3550, 3650] (3650MHz), thereby obtaining the updated available frequency band [3600, 3650].

[0055] In step S406, the base station can record the start and end frequencies of a new available frequency band (e.g., via merging) or an updated available frequency band (e.g., via truncation and subsequent updating) in the available frequency band information of the continuous bandwidth, thereby updating the available frequency band information. Continuing with the example above where the base station determines the start and end frequencies of the continuous bandwidth [3550, 3650] and the start frequencies of each available frequency band in spectrum resource configuration #6, the continuous bandwidth [3550, 3650] includes available frequency bands [3550, 3560], [3570, 3600], and [3600, 3670]. Through steps S402 and S403, the base station can determine that available frequency bands [3570, 3600] and [3600, 3670] are mutually matched and can be merged into a new available frequency band [3570, 3670]. Following steps S404 and S405, the base station can determine that the available frequency band [3570, 3670] exceeds the continuous bandwidth and needs to be truncated. The base station can then update this new available frequency band [3570, 3670] to [3570, 3650]. Therefore, in step S406, the base station can update the available frequency band information to include the available frequency bands [3550, 3560] and [3570, 3650].

[0056] In some embodiments, the base station may further segment the available frequency bands in the continuous bandwidth according to a default length, thereby updating the available frequency band information of the continuous bandwidth. Specifically, the default length may include 10MHz, 20MHz, 30MHz, or 40MHz. In some embodiments, these default lengths are related to the setting of a portion of the bandwidth. For example, based on system settings, the base station can only activate a portion of the bandwidth within these default lengths, but the present invention is not limited thereto. The aforementioned default lengths may vary depending on the system settings. In some embodiments, the base station may determine whether the available frequency bands in the continuous bandwidth match the default length. If the available frequency bands do not match any of the default lengths, the base station may segment the available frequency bands into multiple available frequency bands according to the default length that is the largest but shorter than the available frequency band, and record the start and end frequencies of the multiple available frequency bands in the available frequency band information corresponding to the continuous bandwidth to update the available frequency band information.

[0057] For example, suppose there is a usable frequency band [3550, 3650] within a continuous bandwidth [3550, 3650]. Since the width of the usable frequency band [3550, 3650] is 100MHz, it does not match the default lengths of 10MHz, 20MHz, 30MHz, or 40MHz. Therefore, the base station can divide the usable frequency band [3550, 3650] into multiple usable frequency bands based on a length shorter than the default length of the usable frequency band [3550, 3650]. For example, the base station can divide the usable frequency band [3550, 3650] into a usable frequency band [3550, 3590] with a width of 40MHz and a usable frequency band [3590, 3650] with a width of 60MHz based on the default length of 40MHz. Next, the base station can further divide the 60MHz wide available frequency band [3590, 3650] into a 40MHz wide available frequency band [3590, 3630] and a 20MHz wide available frequency band [3630, 3650], based on the default length of 40MHz. The 20MHz wide available frequency band [3630, 3650] matches the default length of 20MHz, so no further division is required. Therefore, the original available frequency band [3550, 3650] can be divided into three available frequency bands: a 40MHz wide available frequency band [3550, 3590], a 40MHz wide available frequency band [3590, 3630], and a 20MHz wide available frequency band [3630, 3650].

[0058] To give another example, suppose there is a usable frequency band [3600, 3650] within the contiguous bandwidth [3550, 3650]. Since the width of the usable frequency band [3600, 3650] is 50MHz, it does not match the default lengths of 10MHz, 20MHz, 30MHz, or 40MHz. Therefore, the base station can divide the usable frequency band [3600, 3650] into multiple usable frequency bands based on a length shorter than the default length of the usable frequency band [3600, 3650]. For example, the base station can divide the usable frequency band [3600, 3650] into a 40MHz wide usable frequency band [3600, 3640] and a 10MHz wide usable frequency band [3640, 3650] based on the default length of 40MHz. The available frequency band [3600, 3640] with a width of 40MHz matches the default length of 40MHz, and the available frequency band [3640, 3650] with a width of 10MHz matches the default length of 10MHz, so no further segmentation is needed. Therefore, the original available frequency band [3600, 3650] can be divided into two available frequency bands: the 40MHz wide band [3600, 3640] and the 10MHz wide band [3640, 3650].

[0059] In some embodiments, to save data space, improve computing efficiency, and reduce energy consumption, the base station may selectively store only a fixed number of high-priority available frequency bands (e.g., four groups) in the available frequency band information of a continuous bandwidth. Here, the priority may include the type of frequency band (e.g., PAL bands take precedence over GAA bands) or the size of the frequency band (e.g., prioritizing the storage of 40MHz available frequency bands), etc., and the present invention is not limited thereto.

[0060] In step S407, the base station can select one of multiple consecutive bandwidths as the selected bandwidth based on the available frequency band information of each consecutive bandwidth. In some embodiments, the base station can determine which of the multiple consecutive bandwidths is the selected bandwidth based on the priority of each consecutive bandwidth. For example, the base station can select the consecutive bandwidth with the highest priority from among the consecutive bandwidths as the selected bandwidth. In some embodiments, the priority of each consecutive bandwidth is related to the priority of the available frequency bands included in each consecutive bandwidth. For example, having a higher priority available frequency band (e.g., a PAL band, or a wider available frequency band) or having more higher priority available frequency bands in a consecutive bandwidth can increase the priority of the consecutive bandwidth. The base station can combine these factors (e.g., the degree to which the PAL band increases the priority, or the priority of a wider available frequency band) according to various conditions and weights to prioritize these consecutive bandwidths. The base station can then select the selected bandwidth based on the ranking result of the consecutive bandwidths according to priority, for example, selecting the consecutive bandwidth with the highest priority (i.e., the first one in the ranking) as the selected bandwidth.

[0061] Figure 5 A flowchart of a method for comparing the priorities of a first consecutive bandwidth and a second consecutive bandwidth is shown according to an embodiment of the present invention. For the sake of brevity, Figure 5 The first and second consecutive bandwidths mentioned can be some or all of the aforementioned multiple consecutive bandwidths. When the number of consecutive bandwidths is greater than two, it should still be possible to use [the same method / mechanism]. Figure 5 The steps described in the same / similar way sort these consecutive bandwidths.

[0062] Additionally, in some embodiments... Figure 5 The steps shown may be part of step S407. Please refer to... Figure 5In step S501, the base station can determine whether only one of the available frequency bands of the first continuous bandwidth or the second continuous bandwidth contains a PAL band. If only one of the available frequency bands of the first continuous bandwidth or the second continuous bandwidth contains a PAL band, then proceed to step S502. In step S502, since only one of them, for example, the first continuous bandwidth, contains a PAL band, the priority of the first continuous bandwidth should be higher than that of the second continuous bandwidth, which does not have an available PAL band. Therefore, the base station can determine that the priority of the first continuous bandwidth, which includes an available PAL band, is greater than the priority of the second continuous bandwidth. That is, if the first continuous bandwidth and the second continuous bandwidth are available for the base station to choose from, the base station can select the first continuous bandwidth as the selected bandwidth.

[0063] Next, if it is not only one of the available frequency bands of the first continuous bandwidth and the second continuous bandwidth that includes the PAL band (i.e., both the available frequency bands of the first continuous bandwidth and the second continuous bandwidth include the PAL band), or if neither the available frequency bands of the first continuous bandwidth nor the second continuous bandwidth includes the PAL band, then proceed to step S503. In step S503, the base station can determine whether both the available frequency bands of the first continuous bandwidth and the second continuous bandwidth include the PAL band. If both the available frequency bands of the first continuous bandwidth and the second continuous bandwidth include the PAL band, then proceed to step S504. If neither the available frequency bands of the first continuous bandwidth nor the second continuous bandwidth includes the PAL band, then proceed to step S505.

[0064] If both the available frequency bands of the first and second consecutive bandwidths contain PAL bands, in step S504, the base station can determine the priority of each consecutive bandwidth based on the width of the PAL bands. Specifically, assuming the width of the PAL band in the first consecutive bandwidth is greater than the width of the PAL band in the second consecutive bandwidth, the base station can determine that the priority of the first consecutive bandwidth is greater than the priority of the second consecutive bandwidth in response to the fact that the width of the PAL band in the first consecutive bandwidth is greater than the width of the PAL band in the second consecutive bandwidth. For example, assuming the available frequency bands of the first consecutive bandwidth contain PAL bands [3570, 3590] and the available frequency bands of the second consecutive bandwidth contain PAL bands [3550, 3560], the base station can determine that the priority of the first consecutive bandwidth is greater than the priority of the second consecutive bandwidth in response to the fact that the width of the PAL bands [3570, 3590] (20MHz) is greater than the width of the PAL bands [3550, 3560] (10MHz).

[0065] In some embodiments, the available frequency bands in the available frequency band information of the first and second continuous bandwidths are presented in descending order of their width. If neither the available frequency band of the first nor the available frequency band of the second continuous bandwidth contains a PAL band (step S505, Yes), in step S505, the base station can detect the width of the k-th widest GAA band in the available frequency band of the first continuous bandwidth and the width of the k-th widest GAA band in the available frequency band of the second continuous bandwidth, where k is a positive integer with an initial value of zero. The base station can compare the widths of the two GAA bands and determine whether the widths of the two GAA bands are different. If the base station determines that the widths of the two GAA bands are different, it proceeds to step S506. If the base station determines that the widths of the two GAA bands are the same, it proceeds to step S507.

[0066] In step S506, the base station can determine the priority of the continuous bandwidth based on the width of the GAA band. Specifically, the initial value of k can be set to 1. The base station can determine that the priority of the first continuous bandwidth is greater than the priority of the second continuous bandwidth in response to the fact that the width of the k-th widest GAA band in the first continuous bandwidth is greater than the width of the k-th widest GAA band in the second continuous bandwidth. For example, suppose the first widest (i.e., k=1) GAA band in the available bands of the first continuous bandwidth is band [3660, 3700] and the first widest GAA band in the available bands of the second continuous bandwidth is band [3550, 3560]. The base station can determine that the priority of the first continuous bandwidth is greater than the priority of the second continuous bandwidth in response to the fact that the width of the GAA band [3660, 3700] of the first continuous bandwidth is 40MHz greater than the width of the GAA band [3550, 3560] of the second continuous bandwidth is 10MHz.

[0067] In step S507, the base station can determine whether the available frequency bands of the first continuous bandwidth and the available frequency bands of the second continuous bandwidth each contain GAA frequency bands whose widths have not yet been compared. If the available frequency bands of the first continuous bandwidth contain GAA frequency bands whose widths have not yet been compared, and the available frequency bands of the second continuous bandwidth also contain GAA frequency bands whose widths have not yet been compared, the base station can increment the value of the positive integer k by one and re-execute step S505. If the available frequency bands of the first continuous bandwidth do not contain GAA frequency bands whose widths have not yet been compared, and / or the available frequency bands of the second continuous bandwidth do not contain GAA frequency bands whose widths have not yet been compared, then proceed to step S508.

[0068] In step S508, the base station randomly determines whether the first continuous bandwidth or the second continuous bandwidth has higher priority. Simply put, steps S505 to S508 involve a series of comparisons of the widths of all available frequency bands for both the first and second continuous bandwidths. That is, the continuous bandwidth including the wider available frequency band has higher priority. If the widths of the widest available frequency bands in both the first and second continuous bandwidths are the same, then the width of the next widest available bandwidth is compared, and so on. If all available frequency bands are compared but no higher priority can be determined, in step S508, since the comparison is based on frequency band type and frequency band width, the first and second continuous bandwidths essentially have the same priority. However, for the sake of simplicity in subsequent steps, ... Figure 5 In the illustrated embodiment, the base station can randomly determine which one has a higher priority.

[0069] It is worth mentioning that, Figure 5 The steps shown are merely illustrative, and the order of the steps can be adjusted or changed according to actual circumstances. For example, in some embodiments, the base station may perform the judgment in step S303 before performing the judgment in S301. In some embodiments, both the first continuous bandwidth and the second continuous bandwidth include more than one available frequency band that is a PAL band. In these embodiments, the width of each PAL band in the first continuous bandwidth and the second continuous bandwidth is further compared (e.g., using the logic of steps S505 to S508). In some embodiments, the factors for comparing priority include not only the frequency band type and frequency band width, but also other factors (e.g., the concentration of available frequency bands, or the proximity of available frequency bands to lower frequencies). These factors can be introduced in step S508 for further comparison, instead of randomly determining the priority. Return to Figure 2 After determining the selected bandwidth as the base station's operating bandwidth and obtaining the available frequency band information of the selected bandwidth, in step S203, the base station can obtain the available frequency bands within the selected bandwidth based on the available frequency band information, and select one or more candidate frequency bands from the available frequency bands. In some embodiments, the base station can determine the candidate frequency bands based on the priority of each available frequency band. For example, the priority of an available frequency band belonging to the PAL band is higher than the priority of an available frequency band belonging to the GAA band. If two available frequency bands are both GAA bands, the priority of the GAA band with wider bandwidth is higher than the priority of the GAA band with narrower bandwidth. In short, the detailed method for determining the priority of available frequency bands can be found in... Figure 5 The methods are similar.

[0070] For example, suppose the base station receives spectrum resource configuration #6 from the SAS as shown in Table 1, and the selected bandwidth is [3550, 3650]. In this case, the available frequency bands within the selected bandwidth [3550, 3650] include bands [3550, 3560], [3570, 3600], [3600, 3640], and [3640, 3670]. Band [3550, 3560] is a PAL band, and the remaining bands are GAA bands. The base station can determine that band [3550, 3560] has the highest priority because it is a PAL band. On the other hand, the base station can determine that the priority of frequency band [3600, 3640] is greater than that of frequency band [3570, 3600] (40MHz) and frequency band [3640, 3670] (30MHz) because the bandwidth of frequency band [3600, 3640] is greater than that of frequency band [3570, 3600] and frequency band [3640, 3670]. Therefore, according to the above priority ranking, the available frequency band [3550, 3560] belonging to the PAL band can be set as the first candidate frequency band, the available frequency band [3600, 3640] with a bandwidth of 40MHz can be set as the second candidate frequency band, and the available frequency bands [3570, 3600] and [3640, 3670] with a bandwidth of 30MHz can be set as the third and fourth candidate frequency bands, respectively.

[0071] Furthermore, in step S204, the base station can configure candidate frequency bands to activate a portion of the bandwidth (BWP), allowing user equipment (UE) served by the base station to camp on the base station via the candidate frequency bands. In some embodiments, after the base station determines multiple candidate frequency bands, including a first candidate frequency band and a second candidate frequency band, the base station can select a first candidate frequency band from the multiple candidate frequency bands based on, for example, the priority of the candidate frequency bands, and configure the first candidate frequency band to activate a portion of the bandwidth to serve multiple UEs. To avoid excessive UEs camping on the portion of the bandwidth activated by the first candidate frequency band, causing excessive load on the portion of the bandwidth, the base station can determine if the number of UEs served by the first candidate frequency band exceeds a threshold, activate a portion of the bandwidth in the second candidate frequency band, and switch some of the UEs from the first candidate frequency band to the second candidate frequency band. The threshold can be set according to actual conditions, such as the bandwidth of the first candidate frequency band, the ratio of the first candidate frequency band to the selected bandwidth, or the upper limit of the number of portion bandwidths that can be technically operated. In practice, the threshold can be, for example, 8 or 16. In some embodiments, the base station may determine whether a user equipment (UE) should be switched to a second candidate frequency band based on the duration of its presence on the base station via the first candidate frequency band. Specifically, assume that multiple UEs, including a first UE and a second UE, are present on the base station via the first candidate frequency band. If the first UE's presence on the base station via the first candidate frequency band is longer than the second UE's presence on the first candidate frequency band, the base station may select the first UE from the first UE and the second UE and switch it from the first candidate frequency band to the second candidate frequency band. In some embodiments, the base station may also determine whether a UE should be reassigned to the second candidate frequency band based on other conditions, such as, but not limited to, the user's device type, the user's tariff plan, and whether the user is an external network or roaming user.

[0072] Figure 6 According to an embodiment of the present invention, a signaling diagram for switching a user equipment from a first candidate frequency band to a second candidate frequency band is shown. The above method can be executed by a base station 61, wherein the base station 61 includes a central unit 62 and a distribution unit 63. In some embodiments, the central unit 62 and the distribution unit 63 of the base station 61 can be implemented by software modules or hardware. It should be noted that, for ease of explanation, Figure 6 Only one user device 64 is shown as an example. Although Figure 6 Only one user equipment 64 is shown, but the present invention does not limit the number of user equipment that a base station can serve.

[0073] In step S601, the central unit 62 and the distribution unit 63 may exchange signaling to prepare to attach the user equipment 64 to the initial partial bandwidth activated by the first candidate frequency band (hereinafter referred to as "BWP 0"), so that the user equipment 64 camps on the base station 61 via the first candidate frequency band (i.e., BWP 0). The central unit 62 or the distribution unit 63 may complete step S601, for example, through message signaling such as RRC_RECFG, RRC_RECFG_COMPLETE, UE_CONTEXT_MODIFICATION_REQ, or UE_CONTEXT_MODIFICATION_RSP.

[0074] In step S602, the central unit 62 and the distribution unit 63 determine that the user equipment 64 has successfully attached to BWP 0. The central unit 62 and the distribution unit 63 can attach multiple other user equipments to BWP 0 through actions similar to those in step S601. Therefore, when multiple other user equipments have also successfully attached to BWP 0, multiple user equipments can simultaneously camp on base station 61 via the first candidate frequency band.

[0075] In step S603, the distribution unit 63 can monitor the number of multiple user equipments residing in the base station via the first candidate frequency band.

[0076] In step S604, by monitoring, the distribution unit 63 can determine whether the number of multiple user equipments residing at the base station 61 via the first candidate frequency band is greater than a threshold. If the number is greater than the threshold, it indicates that BWP 0 is overloaded. Accordingly, the base station 61 can perform the following steps to switch user equipment 64 to other portions of the bandwidth (i.e., the second candidate frequency band or "BWP1").

[0077] In step S605, the distribution unit 63 may transmit a user equipment configuration change request to the central unit 62. The user equipment configuration change request may include information indicating a second candidate frequency band, such as the firstActvBwp-Id parameter corresponding to the second candidate frequency band. The distribution unit 63 may transmit the user equipment configuration change request to the central unit 62, for example, via a US_CONTEXT_MODIFICATION_RQRD message. When the central unit 62 receives the user equipment configuration change request, it can select, according to the above method (e.g., dwell time), the user equipment 64 to be reconfigured to the second candidate frequency band from among the multiple user equipments residing on the base station 61 via the first candidate frequency band. For ease of explanation, Figure 6 User equipment 64 is one of the user equipment selected by the central unit 62 to be reconfigured to the second candidate frequency band.

[0078] In step S606, the central unit 62 may transmit a Radio Resource Control (RRC) reconfiguration (RRC_RECFG) message to the distribution unit 63 according to the information. The RRC reconfiguration message is used to instruct the user equipment 64 to switch to the second candidate frequency band.

[0079] In step S607, the distribution unit 63 forwards the RRC reconfiguration message to the user equipment 64 via the first candidate frequency band.

[0080] In step S608, the distribution unit 63 switches to the second candidate frequency band to monitor signaling.

[0081] In step S609, user equipment 64 may switch to transmit a scheduling request (SR) to distribution unit 63 via the second candidate frequency band (or BWP 1 activated by the second candidate frequency band) in response to the RRC reconfiguration message. Distribution unit 63 may receive the scheduling request corresponding to the RRC reconfiguration message from user equipment 64 via the second candidate frequency band.

[0082] In step S610, in response to the determination that a scheduling request has been received, the distribution unit 63 may transmit an RRC reconfiguration complete (RRC_RECFG_COMPLETE) message to the central unit 62, thereby switching the operating frequency band of the user equipment 64 from the first candidate frequency band to the second candidate frequency band according to the scheduling request.

[0083] In step S611, user equipment 64 transmits and receives data using the radio resources of the second candidate frequency band (or BWP 1).

[0084] Figure 7 A schematic diagram of a network node 700 is shown according to an embodiment of the present invention. The network node 700 can be used to perform the functions of the aforementioned base station, central unit, or distribution unit. The network node 700 may include a processor 710, a storage medium 720, and a transceiver 730.

[0085] Processor 710 may be, for example, a Central Processing Unit (CPU), or other programmable general-purpose or special-purpose microcontrollers (MCUs), microprocessors, digital signal processors (DSPs), programmable controllers, application-specific integrated circuits (ASICs), graphics processing units (GPUs), image signal processors (ISPs), image processing units (IPUs), arithmetic logic units (ALUs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), or other similar components or combinations thereof. Processor 710 may be coupled to storage medium 720 and transceiver 730, and access and execute multiple modules and various applications stored in storage medium 720.

[0086] Storage medium 720 may be, for example, any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory, hard disk drive (HDD), solid state drive (SSD), or similar components or combinations thereof, for storing multiple modules or various applications that can be executed by processor 710.

[0087] Transceiver 730 transmits and receives signals wirelessly or via a wired connection. Transceiver 730 can also perform operations such as low-noise amplification, impedance matching, mixing, up- or down-frequency conversion, filtering, amplification, and similar functions.

[0088] Based on the above, the base station of the present invention can utilize a sliding window to detect spectrum resources to obtain multiple consecutive bandwidths from the CBRS spectrum. For each consecutive bandwidth, the base station can perform merging or truncation processing on one or more available frequency bands within the consecutive bandwidth to obtain available frequency band information for each consecutive bandwidth. The base station can select its operating bandwidth from the multiple consecutive bandwidths based on an optimized frequency selection strategy for PAL and GAA bands, and further select frequency bands with higher priority from the operating bandwidth as candidate frequency bands. The base station can configure the candidate frequency bands to activate a portion of the bandwidth to serve multiple user equipment. The base station of the present invention can utilize the existing multi-part bandwidth technology of the 5G standard to achieve effective utilization of CBRS spectrum resources and further reduce the hardware and deployment costs of the base station, especially the setup of 5G base stations, small cells, or 5G customer premises equipment (CPE).

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bandwidth selection method for Citizens Broadband Radio Service, applicable to a base station, characterized in that, The bandwidth selection method comprises: receiving a spectrum resource configuration from a spectrum access system, wherein the spectrum resource configuration indicates at least one available frequency band, and the at least one available frequency band comprises a priority access licensed frequency band or a general authorized access frequency band; detecting a plurality of contiguous bandwidths according to the spectrum resource configuration to obtain available frequency band information of the contiguous bandwidths; selecting a first contiguous bandwidth from the plurality of contiguous bandwidths as a selected bandwidth from the Citizens Broadband Radio Service according to the available frequency band information, wherein the selected bandwidth comprises part or all of the available frequency bands, and wherein first available frequency band information corresponding to the first contiguous bandwidth indicates that the available frequency bands in the first contiguous bandwidth comprise a first priority access licensed frequency band; and selecting a candidate frequency band from the available frequency bands in the selected bandwidth, and configuring the candidate frequency band to activate a partial bandwidth.

2. The bandwidth selection method of claim 1, wherein the bandwidth selection method further comprises: obtaining a plurality of contiguous bandwidths from a spectrum of the Citizens Broadband Radio Service according to a sliding window, wherein the available frequency band information of the contiguous bandwidths indicates the available frequency bands in the contiguous bandwidths.

3. The bandwidth selection method of claim 2, wherein the plurality of contiguous bandwidths further comprises a second contiguous bandwidth, and wherein the step of selecting the first contiguous bandwidth from the contiguous bandwidths as the selected bandwidth from the Citizens Broadband Radio Service according to the available frequency band information comprises: comparing a first priority access licensed frequency band and a second priority access licensed frequency band in response to second available frequency band information of the second contiguous bandwidth indicating that at least one available frequency band in the second contiguous bandwidth comprises the second priority access licensed frequency band; and selecting the first contiguous bandwidth as the selected bandwidth in response to a width of the first priority access licensed frequency band being greater than a width of the second priority access licensed frequency band.

4. The bandwidth selection method of claim 2, wherein the plurality of contiguous bandwidths further comprises a second contiguous bandwidth, wherein first available frequency band information corresponding to the first contiguous bandwidth indicates that the available frequency bands in the first contiguous bandwidth comprise a first general authorized access frequency band, second available frequency band information corresponding to the second contiguous bandwidth indicates that the available frequency bands in the second contiguous bandwidth comprise a second general authorized access frequency band, and a width of the first general authorized access frequency band is greater than a width of the second general authorized access frequency band.

5. The bandwidth selection method of claim 2, wherein the step of obtaining the available frequency band information of the contiguous bandwidths comprises: determining that a first available frequency band is included in the first contiguous bandwidth from the contiguous bandwidths according to the spectrum resource configuration; segmenting the first available frequency band into a second available frequency band and a third available frequency band according to a default length in response to the first available frequency band not matching the default length, wherein the default length is shorter than the first available frequency band; and determining the available frequency band information corresponding to the first contiguous bandwidth according to the second available frequency band and the third available frequency band. ​ ​ 6. The bandwidth selection method of claim 2, wherein the available frequency bands indicated in the available frequency band information of each of the contiguous bandwidths comprise at least one of: a first available frequency band, wherein the first available frequency band overlaps with the contiguous bandwidth; and a second available frequency band, wherein the second available frequency band is located in the contiguous bandwidth.

7. The bandwidth selection method of claim 2, wherein the available frequency bands comprise a first available frequency band and a second available frequency band, and the step of detecting the plurality of contiguous bandwidths from the spectrum resource configuration to obtain the available frequency band information of each of the contiguous bandwidths comprises: reading a start frequency and an end frequency of the first contiguous bandwidth among the contiguous bandwidths; obtaining start frequencies and end frequencies of the first available frequency band and the second available frequency band from the spectrum resource configuration; and determining whether the first available frequency band and the second available frequency band are located in the first contiguous bandwidth according to the start frequency of the first contiguous bandwidth, the end frequency of the first contiguous bandwidth, and the start frequency of the first available frequency band and the second available frequency band.

8. The bandwidth selection method of claim 7, wherein the bandwidth selection method further comprises: in response to a determination that the first available frequency band and the second available frequency band are located in the first contiguous bandwidth and the end frequency of the first available frequency band matches the start frequency of the second available frequency band, merging the first available frequency band and the second available frequency band to generate a third available frequency band; and recording a start frequency and an end frequency of the third available frequency band in the available frequency band information corresponding to the first contiguous bandwidth.

9. The bandwidth selection method of claim 7, wherein the bandwidth selection method further comprises: in response to a determination that the start frequency of the first available frequency band is between the start frequency and the end frequency of the first contiguous bandwidth, determining that the first available frequency band is located in the first contiguous bandwidth; in response to a determination that the first available frequency band is located in the first contiguous bandwidth and the end frequency of the first available frequency band is greater than the end frequency of the first contiguous bandwidth, updating the end frequency of the first available frequency band to be the end frequency of the first contiguous bandwidth; and recording a start frequency and an end frequency of the updated first available frequency band in the available frequency band information corresponding to the first contiguous bandwidth.

10. The bandwidth selection method of claim 1, wherein the available frequency bands in the selected bandwidth comprise a first candidate frequency band and a second candidate frequency band, the bandwidth selection method further comprising: selecting the first candidate frequency band and configuring the first candidate frequency band to activate the partial bandwidth to serve a plurality of user equipments; and in response to a determination that a number of the plurality of user equipments served by the first candidate frequency band is greater than a threshold, activating the partial bandwidth at the second candidate frequency band and switching a first user equipment among the plurality of user equipments from the first candidate frequency band to the second candidate frequency band. ​ ​ 11. The bandwidth selection method of claim 10, wherein, The first candidate frequency band has a wider bandwidth than the second candidate frequency band, or the first candidate frequency band is the priority access licensed frequency band and the second candidate frequency band is the general authorized access frequency band.

12. The bandwidth selection method of claim 10, wherein the base station comprises a central unit and a distributed unit, and the switching the first one of the user equipments from the first candidate frequency band to the second candidate frequency band comprises: monitoring, via the distributed unit of the base station, a number of the user equipments camped on the base station via the first candidate frequency band; in response to a determination that the number of the user equipments camped on the base station via the first candidate frequency band is greater than a threshold, transmitting, via the distributed unit, a user equipment configuration change request to the central unit, wherein the user equipment configuration change request comprises information indicating the second candidate frequency band; transmitting, by the central unit, a radio resource control reconfiguration message to the distributed unit according to the information, wherein the radio resource control reconfiguration message indicates to switch the first user equipment to the second candidate frequency band; forwarding, by the distributed unit, the radio resource control reconfiguration message to the first user equipment via the first candidate frequency band, and switching to the second candidate frequency band to receive a scheduling request corresponding to the radio resource control reconfiguration message from the first user equipment; and in response to a determination that the scheduling request has been received, switching, by the distributed unit, the first user equipment from the first candidate frequency band to camp on the base station via the second candidate frequency band according to the scheduling request.

13. The bandwidth selection method of claim 10, wherein, The plurality of user equipments further comprises a second user equipment, wherein a time that the first user equipment camps on the base station via the first candidate frequency band is longer than a time that the second user equipment camps on the base station via the first candidate frequency band.

14. A base station, characterized by comprises: a transceiver configured to receive a spectrum resource configuration from a spectrum access system, wherein the spectrum resource configuration indicates at least one available frequency band, the at least one available frequency band comprising a priority access licensed frequency band or a general authorized access frequency band; and a processor coupled to the transceiver and configured to perform: detecting a plurality of contiguous bandwidths according to the spectrum resource configuration to obtain available frequency band information of the respective contiguous bandwidths; selecting a first contiguous bandwidth from the plurality of contiguous bandwidths as a selected bandwidth from the Citizens Broadband Radio Service according to the available frequency band information to be a working bandwidth of the base station, wherein the selected bandwidth comprises part or all of the available frequency bands, and wherein first available frequency band information corresponding to the first contiguous bandwidth indicates that the available frequency bands within the first contiguous bandwidth comprise a first priority access licensed frequency band; and selecting a candidate frequency band from the available frequency bands within the selected bandwidth, and configuring the candidate frequency band to activate a partial bandwidth.

15. The base station of claim 14, wherein the processor is further configured to perform: obtaining a plurality of contiguous bandwidths from the spectrum of the Citizens Broadband Radio Service according to a sliding window, wherein the available frequency band information of each contiguous bandwidth indicates the available frequency bands within the each contiguous bandwidth.

16. The base station of claim 15, wherein the plurality of contiguous bandwidths further comprises a second contiguous bandwidth, and the processor is further configured to perform: in response to second available frequency band information of the second contiguous bandwidth indicating that at least one available frequency band within the second contiguous bandwidth comprises a second priority access licensed frequency band, comparing the first priority access licensed frequency band with the second priority access licensed frequency band; and in response to a width of the first priority access licensed frequency band being greater than a width of the second priority access licensed frequency band, selecting the first contiguous bandwidth as the selected bandwidth.

17. The base station of claim 15, wherein the plurality of contiguous bandwidths further comprises a second contiguous bandwidth, wherein first available frequency band information corresponding to the first contiguous bandwidth indicates that the available frequency bands within the first contiguous bandwidth comprise a first general authorized access frequency band, second available frequency band information corresponding to the second contiguous bandwidth indicates that the available frequency bands within the second contiguous bandwidth comprise a second general authorized access frequency band, and a width of the first general authorized access frequency band is greater than a width of the second general authorized access frequency band.

18. The base station of claim 15, wherein the processor is further configured to perform: determining, according to the spectrum resource configuration, that the first contiguous bandwidth of the contiguous bandwidths comprises a first available frequency band; in response to the first available frequency band not matching a default length, partitioning the first available frequency band into a second available frequency band and a third available frequency band according to the default length, wherein the default length is shorter than the first available frequency band; and determining the available frequency band information corresponding to the first contiguous bandwidth according to the second available frequency band and the third available frequency band.

19. The base station of claim 15, wherein the available frequency bands indicated by the available frequency band information within the corresponding contiguous bandwidths comprise at least one of: a first available frequency band, wherein the first available frequency band partially overlaps with the contiguous bandwidth; and a second available frequency band, wherein the second available frequency band is located in the contiguous bandwidth.

20. The base station of claim 15, wherein the available frequency bands comprise a first available frequency band and a second available frequency band, and the processor is further configured to perform: reading a start frequency and an end frequency of the first contiguous bandwidth of the contiguous bandwidths; obtaining start frequencies and end frequencies of the first available frequency band and the second available frequency band from the spectrum resource configuration; and determining whether the first available frequency band and the second available frequency band are located in the first contiguous bandwidth according to the start frequency of the first contiguous bandwidth, the end frequency of the first contiguous bandwidth, the start frequency of the first available frequency band, and the start frequency of the second available frequency band.

21. The base station of claim 20, wherein the processor is further configured to perform: in response to a determination that the first available frequency band and the second available frequency band are located in the first contiguous bandwidth and the end frequency of the first available frequency band matches the start frequency of the second available frequency band, merging the first available frequency band and the second available frequency band to generate a third available frequency band; and recording a start frequency and an end frequency of the third available frequency band in the available frequency band information corresponding to the first contiguous bandwidth.

22. The base station of claim 20, wherein the processor is further configured to perform: in response to a determination that the start frequency of the first available frequency band is between the start frequency and the end frequency of the first contiguous bandwidth, determining that the first available frequency band is located in the first contiguous bandwidth; in response to a determination that the first available frequency band is located in the first contiguous bandwidth and the end frequency of the first available frequency band is greater than the end frequency of the first contiguous bandwidth, updating the end frequency of the first available frequency band to be the end frequency of the first contiguous bandwidth; and recording a start frequency and an end frequency of the updated first available frequency band in the available frequency band information corresponding to the first contiguous bandwidth.

23. The base station of claim 14, wherein the available frequency bands in the selected bandwidth include a first candidate frequency band and a second candidate frequency band, and the processor is further configured to perform: selecting the first candidate frequency band and configuring the first candidate frequency band to activate the partial bandwidth to serve a plurality of user equipments; and in response to a determination that a number of the plurality of user equipments served by the first candidate frequency band is greater than a threshold, activating the partial bandwidth at the second candidate frequency band and switching a first user equipment of the plurality of user equipments from the first candidate frequency band to the second candidate frequency band.

24. The base station of claim 23, wherein, the first candidate frequency band has a wider bandwidth than the second candidate frequency band, or the first candidate frequency band is the priority access licensed frequency band and the second candidate frequency band is the normal granted access frequency band.

25. The base station of claim 23, wherein the base station further comprises a central unit and a distributed unit, and is configured to perform: monitoring, via the distributed unit of the base station, a number of the plurality of user equipments camped on the base station via the first candidate frequency band; in response to a determination that the number of the plurality of user equipments camped on the base station via the first candidate frequency band is greater than a threshold, transmitting, via the distributed unit, a user equipment configuration change request to the central unit, wherein the user equipment configuration change request includes information indicating the second candidate frequency band; transmitting, by the central unit, a radio resource control reconfiguration message to the distributed unit according to the information, wherein the radio resource control reconfiguration message indicates to switch the first user equipment to the second candidate frequency band; forwarding, by the distributed unit, the radio resource control reconfiguration message to the first user equipment via the first candidate frequency band, and switching to the second candidate frequency band to receive a scheduling request corresponding to the radio resource control reconfiguration message from the first user equipment; and in response to a determination that the scheduling request has been received, switching, by the distribution unit, the first user equipment from camping on the base station at the first candidate frequency band to camping on the base station at the second candidate frequency band in accordance with the scheduling request.

26. The base station of claim 23, wherein, the plurality of user equipments further comprises a second user equipment, wherein a time for the first user equipment to camp on the base station at the first candidate frequency band is longer than a time for the second user equipment to camp on the base station at the first candidate frequency band.

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