CN112969190B - Method and terminal for selecting carrier aggregation cell main carrier - Google Patents

Method and terminal for selecting carrier aggregation cell main carrier Download PDF

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Publication number
CN112969190B
CN112969190B CN202110207695.0A CN202110207695A CN112969190B CN 112969190 B CN112969190 B CN 112969190B CN 202110207695 A CN202110207695 A CN 202110207695A CN 112969190 B CN112969190 B CN 112969190B
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base station
current
terminal
service
azimuth angle
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CN112969190A (en
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许珺
周晶
严斌峰
栾帅
师瑜
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The present disclosure provides a method, a terminal, a computer device, and a readable storage medium for selecting a carrier aggregation cell primary carrier, where the method includes: the terminal periodically reads the current beam azimuth of the uplink service and judges whether the current beam azimuth is in a critical state or not; if yes, starting to monitor other working frequency bands except the current main carrier and the auxiliary carrier so as to search candidate base stations for use; calculating a beam azimuth angle pointing to the candidate base station through a terminal array antenna; selecting the optimal service beam and the target base station according to the current beam azimuth angle of the uplink service and the beam azimuth angle pointing to the candidate base station; reside in the target base station. According to the technical scheme, the dominant main carrier can be autonomously selected based on the self-beam state sensing of the terminal so as to obtain optimal coverage and rate experience of the user, and terminal service interruption caused by pilot frequency measurement when the base station initiates a complex pilot frequency switching process is avoided.

Description

Method and terminal for selecting carrier aggregation cell main carrier
Technical Field
The disclosure belongs to the technical field of communication, and in particular relates to a method for selecting a carrier aggregation cell main carrier, a terminal, a computer device and a computer readable storage medium.
Background
Mobile spectrum is the core competitiveness of operators, and the use of spectrum resources concerns network construction costs, perceived network advantages (network coverage, capacity performance). In the long term, the commercial scale of 5G ultimately depends on how the sub6G band is planned for use. At present, the domestic sub6G mobile frequency band can be divided into three layers: a low frequency band below 1GHz, a medium frequency band between 1GHz and 3GHz, and a high frequency band between 3GHz and 6 GHz. It is known that the lower the frequency band is, the better the coverage effect is, but the frequency spectrum supply of the middle and low frequency bands in China is insufficient and fragmented, and the problem of 5G network coverage can only be solved by utilizing the middle and low frequency bands, so that the network capacity cannot be converted. But in contrast to 4G networks, the core user experience of 5G networks is a shift from network coverage capability to network capacity.
Network coverage is a precondition for network capacity. With the advent of the 5G age, requirements on data rate and network coverage are increasing, and carrier aggregation becomes a necessary choice for operators in the future. In short, carrier aggregation is to combine the scattered bands into a virtual, wider band to increase the data rate of a single user. Therefore, the carrier aggregation strategy of high-low frequency combination becomes a preferable deployment scheme with both network coverage and network capacity.
The sharing of base station resources means the sharing of spectrum resources. For example, the total of 5G frequency bands of two operators in China is 200MHz (namely 3400-3500MHz+3500-3600 MHz), further, two 2.1G frequency spectrums are considered to have n1 continuous frequency bands, the frequency bands are re-cultivated for 5G in future, abundant frequency spectrum resources can be provided for further improving the network speed, and better 5G network experience is brought;
according to the above frequency situation, as shown in fig. 1, considering configuration and management of carrier aggregation, there are two options:
TDD (Time-division Duplex mode) +tdd carrier aggregation: 3400-3600 100MHz+100MHz, configuring and optimizing cell_1 or cell_2 as a main carrier, and guaranteeing optimal user experience rate;
FDD (Frequency-division Duplex mode) +tdd carrier aggregation: 2.1G FDD frequency band +3400/3500 100MHz, configuring and optimizing cell_3 as a main carrier, and increasing user coverage experience;
according to the selection, the optimal scheme is to select a TDD+TDD combination in the coverage area of F1 and a FDD+TDD combination in the coverage area of F2.
When the network configures multiple carriers as selectable main carriers at the same time, the current technical mechanism is that the user terminal selects the initially resided carrier as the main carrier until the channel quality of the initially resided main carrier is reduced to trigger the inter-frequency cell switching operation with complex flow, and the optimal main carrier cell resided cannot be selected in real time as required. In addition, the inter-frequency switching needs to enable the UE to temporarily interrupt the service and enter a measurement gap state, so that measurement can be performed on the inter-frequency neighbor cell, and the use experience of the user is influenced.
Disclosure of Invention
The disclosure provides a method, a terminal, a computer device and a computer readable storage medium for selecting a carrier aggregation cell main carrier, which can autonomously select an advantageous main carrier based on the self beam state perception of the terminal so as to obtain optimal coverage and rate experience of a user, and avoid terminal service interruption caused by pilot frequency measurement when a base station initiates a complex pilot frequency switching process.
In a first aspect, an embodiment of the present disclosure provides a method for selecting a carrier aggregation cell primary carrier, which is applied to a terminal side, and includes:
periodically reading the current beam azimuth angle of the uplink service, and judging whether the current beam azimuth angle is in a critical state or not;
if yes, starting to monitor other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search candidate base stations for use;
calculating a beam azimuth angle pointing to the candidate base station through a terminal array antenna;
selecting a target base station according to the current beam azimuth angle of the uplink service and the beam azimuth angle pointing to the candidate base station;
reside in the target base station.
Further, the determining whether the current beam azimuth is in a critical state includes:
judging whether a service beam of the uplink service is still in the capacity range of antenna beam forming, and judging whether an angle difference value between the current beam azimuth angle of the uplink service and the boundary of the capacity range of antenna beam forming is in a preset threshold value;
and if the current beam azimuth angle is in the critical state, judging that the current beam azimuth angle is in the critical state.
Further, the selecting the target base station according to the current beam azimuth of the uplink service and the beam azimuth pointing to the candidate base station includes:
selecting the beam closest to the normal line from the beam corresponding to the current beam azimuth of the uplink service and the beam corresponding to the beam azimuth pointing to the candidate base station;
and taking the beam closest to the normal as an optimal service beam, and taking a base station corresponding to the optimal service beam as a target base station.
Further, the camping on the target base station comprises:
if the optimal service beam is the beam corresponding to the current beam azimuth angle of the uplink service, judging that the terminal has selected the optimal service beam and remaining resident in the current carrier and the base station;
if the optimal service beam is not the beam corresponding to the current beam azimuth angle of the uplink service, reporting the target base station corresponding to the optimal service beam to the current base station, so that the current base station skips the pilot frequency measurement flow, the base station switching operation is scheduled to be completed, and the terminal resides in the working frequency band of the target base station.
In a second aspect, an embodiment of the present disclosure provides a terminal, including:
the terminal service beam sensing module is used for periodically reading the current beam azimuth angle of the uplink service and judging whether the current beam azimuth angle is in a critical state or not;
the base station interception module is configured to, if the terminal service beam sensing module determines that the current beam azimuth is in a critical state, start intercepting other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search for available candidate base stations;
a calculation module arranged to calculate a beam azimuth directed to the candidate base station by a terminal array antenna;
a selecting module, configured to select a target base station according to a current beam azimuth of the uplink service and a beam azimuth directed to the candidate base station;
a camping module configured to camp a terminal on the target base station.
Further, the terminal service beam sensing module is specifically configured to:
judging whether a service beam of the uplink service is still in the capacity range of antenna beam forming, and judging whether an angle difference value between the current beam azimuth angle of the uplink service and the boundary of the capacity range of antenna beam forming is in a preset threshold value;
and if the current beam azimuth angle is in the critical state, judging that the current beam azimuth angle is in the critical state.
Further, the selection module is specifically configured to:
selecting the beam closest to the normal line from the beam corresponding to the current beam azimuth of the uplink service and the beam corresponding to the beam azimuth pointing to the candidate base station;
and taking the beam closest to the normal as an optimal service beam, and taking a base station corresponding to the optimal service beam as a target base station.
Further, the residence module is specifically configured to:
if the optimal service beam selected by the selection module is the beam corresponding to the azimuth angle of the current beam of the uplink service, judging that the terminal has selected the optimal service beam and keeping residing in the current carrier and the base station;
if the optimal service beam selected by the selection module is not the beam corresponding to the azimuth angle of the current uplink service beam, reporting the target base station corresponding to the optimal service beam to the current base station, so that the current base station skips the pilot frequency measurement flow, the base station switching operation is scheduled and completed, and the terminal resides in the working frequency band of the target base station.
In a third aspect, an embodiment of the present disclosure further provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor performs the method for selecting a carrier aggregation cell primary carrier according to any one of the first aspects.
In a fourth aspect, embodiments of the present disclosure also provide a computer-readable storage medium, comprising: a computer program which, when run on a computer, causes the computer to perform the method of selecting a carrier aggregation cell primary carrier as claimed in any one of the first aspects.
The beneficial effects are that:
the method, the terminal, the computer equipment and the computer readable storage medium for selecting the carrier aggregation cell main carrier provided by the disclosure periodically read the current beam azimuth angle of the uplink service and judge whether the current beam azimuth angle is in a critical state or not; if yes, starting to monitor other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search candidate base stations for use; the method comprises the steps of carrying out a first treatment on the surface of the Calculating a beam azimuth angle pointing to the candidate base station through a terminal array antenna; selecting a target base station according to the current beam azimuth angle of the uplink service and the beam azimuth angle pointing to the candidate base station; reside in the target base station. According to the technical scheme, the dominant main carrier can be autonomously selected based on the self-beam state sensing of the terminal so as to obtain optimal coverage and rate experience of the user, and terminal service interruption caused by pilot frequency measurement when the base station initiates a complex pilot frequency switching process is avoided.
Drawings
Fig. 1 is a schematic diagram of carrier aggregation cell primary carrier selection;
fig. 2 is a flowchart of a method for selecting a primary carrier of a carrier aggregation cell according to a first embodiment of the present disclosure;
FIG. 3 is a schematic view of azimuth threshold according to one embodiment of the present disclosure;
fig. 4 is a flowchart of a method for selecting a carrier aggregation cell primary carrier according to a second embodiment of the present disclosure;
fig. 5 is a schematic diagram of a terminal according to a third embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and examples.
Wherein the terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure of embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
When the network configures multiple carriers as selectable main carriers at the same time, the current technical mechanism is that the user terminal selects the initially resided carrier as the main carrier until the channel quality of the initially resided main carrier is reduced to trigger the inter-frequency cell switching operation with complex flow, and the optimal main carrier cell resided cannot be selected in real time as required. In addition, the inter-frequency switching needs to enable the UE to temporarily interrupt the service and enter a measurement gap state, so that measurement can be performed on the inter-frequency neighbor cell, and the use experience of the user is influenced.
The following describes the technical solutions of the present disclosure and how the technical solutions of the present disclosure solve the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 2 is a flowchart of a method for selecting a primary carrier of a carrier aggregation cell according to a first embodiment of the present disclosure, which is applied to a terminal side, as shown in fig. 2, and includes:
step S101: the terminal periodically reads the current beam azimuth of the uplink service and judges whether the current beam azimuth is in a critical state or not;
step S102: if yes, the terminal starts to monitor other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search candidate base stations for use;
step S103: the terminal calculates the beam azimuth angle pointing to the candidate base station through the terminal array antenna;
step S104: the terminal selects a target base station according to the current beam azimuth angle of the uplink service and the beam azimuth angle pointing to the candidate base station;
step S105: the terminal resides to the target base station.
The service beam sensing unit of the terminal obtains the current main carrier service beam azimuth angle of the terminal, namely the current beam azimuth angle of the uplink service by reading the service beam information; and then judging whether the current beam azimuth angle is in a critical state or not. If the current beam azimuth angle is in a critical state; the base station interception unit of the terminal intercepts candidate 5G base station working frequency bands except for the current main carrier and the auxiliary carrier, discovers the 5G base stations which can be accessed potentially on the frequency bands, then the beam comparing unit of the terminal estimates the beam azimuth angle pointing to the candidate 5G base stations, the terminal is configured with an array antenna, and the broadcasting signals of the candidate base stations can be analyzed by utilizing a direction-of-arrival estimation method (such as MUSIC, ESPRIT and improved methods thereof, etc.), so that the beam azimuth angles of the terminal pointing to the candidate base stations respectively are obtained. Then according to the beam azimuth angles pointing to the candidate base stations and the azimuth angle of the current beam, the optimal service beam and the optimal target base station of the terminal are selected together; determining whether to output a switching request according to whether the target base station is a current connection base station or not, and outputting the switching request to the base station when the target base station is not the current connection base station, wherein a request receiving unit of the base station receives and processes a request of a terminal for rapidly switching the target base station; the starting indication unit indicates the scheduler to skip the measurement flow, the switching operation is completed by scheduling, and the terminal resides in the frequency band of the target base station.
Further, the determining whether the current beam azimuth is in the critical state includes:
judging whether a service beam of the uplink service is still in the capacity range of antenna beam forming, and judging whether an angle difference value between the current beam azimuth angle of the uplink service and the boundary of the capacity range of antenna beam forming is in a preset threshold value;
and if the current beam azimuth angle is in the critical state, judging that the current beam azimuth angle is in the critical state.
Fig. 3 is a schematic view of azimuth critical, and as shown in fig. 3, the critical state refers to that the azimuth of the terminal beam is still within the beamforming capability range θ of the antenna t Within, but not more than a threshold value theta from the boundary of the range x The method comprises the following steps: θ t -θ A ＜θ x (θx > 0); in the figure, θ A Is critical state, θ A’ Not critical.
Further, the selecting the target base station according to the current beam azimuth of the uplink service and the beam azimuth pointing to the candidate base station includes:
selecting the beam closest to the normal line from the beam corresponding to the current beam azimuth of the uplink service and the beam corresponding to the beam azimuth pointing to the candidate base station;
and taking the beam closest to the normal as an optimal service beam, and taking a base station corresponding to the optimal service beam as a target base station.
The terminal array antenna estimates the beam azimuth angle phi pointing to the candidate 5G base station(s) (possibly multiple) B 、φ C … … and current beam θ A And comparing the service beam optimal for the terminal with the target base station. Determining whether the terminal is currently in the optimal beam, i.e., θ A 、φ B 、φ C … … beam α closest to the normal direction. And determining the optimal service beam, and taking the base station pointed by the optimal service beam as a target base station.
Further, the camping on the target base station comprises:
if the optimal service beam is the beam corresponding to the current beam azimuth angle of the uplink service, judging that the terminal has selected the optimal service beam and remaining resident in the current carrier and the base station;
if the optimal service beam is not the beam corresponding to the current beam azimuth angle of the uplink service, reporting the target base station corresponding to the optimal service beam to the current base station, so that the current base station skips the pilot frequency measurement flow, the base station switching operation is scheduled to be completed, and the terminal resides in the working frequency band of the target base station.
As described above, the current beam azimuth angle θ A If the beam azimuth angle of the optimal service beam is theta A Judging that the terminal has selected the optimal service beam, keeping the current carrier and the base station resident, and periodically returning to the step S101;
if it is not theta A Judging that the terminal is not in the optimal main carrier wave, and reporting the target switching base station Z pointed by the optimal service beam alpha to the current base station; the base station skips the pilot frequency measurement flow, the switching operation is scheduled to be completed, and the terminal resides in the f frequency band of the base station Z.
In order to more clearly describe the technical solution of the present disclosure, a second embodiment of the present disclosure provides a method for selecting a carrier aggregation cell primary carrier, which is applied to a terminal side, as shown in fig. 3, and includes:
step S1: periodically reading current main carrier wave base station beam azimuth angle
Step S2: judging whether the current beam azimuth angle is critical or not, if so, performing step S3, and if not, returning to step S1;
step S3: intercepting network system information and demodulating a currently selectable base station; determining an optimal beam
Step S4: judging whether the current beam is in the optimal beam, if so, performing step S5, and if not, performing step S6;
step S5: continuing to reside in the current main carrier base station, and returning to the step S1;
step S6: reporting a target switching base station to a base station;
step S7: and (3) finishing switching operation according to the base station scheduling information, and after the target base station is resided, returning to the step (S1).
Fig. 5 is a schematic diagram of a terminal according to a third embodiment of the present disclosure, as shown in fig. 5, including:
the terminal service beam sensing module 1 is configured to periodically read a current beam azimuth of the uplink service and judge whether the current beam azimuth is in a critical state or not;
the base station interception module 2 is configured to, if the terminal service beam sensing module determines that the current beam azimuth is in a critical state, start to intercept other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search for available candidate base stations;
a calculation module 3 arranged to calculate the beam azimuth angle directed to the candidate base station by means of the terminal array antenna;
a selection module 4 configured to select a target base station according to a current beam azimuth of the uplink traffic and a beam azimuth directed to the candidate base station;
a camping module 5 arranged to camp the terminal on said target base station.
Further, the terminal service beam sensing module 1 is specifically configured to:
judging whether a service beam of the uplink service is still in the capacity range of antenna beam forming, and judging whether an angle difference value between the current beam azimuth angle of the uplink service and the boundary of the capacity range of antenna beam forming is in a preset threshold value;
and if the current beam azimuth angle is in the critical state, judging that the current beam azimuth angle is in the critical state.
Further, the selection module 4 is specifically configured to:
selecting the beam closest to the normal direction from the beam corresponding to the current beam azimuth of the uplink service and the beam corresponding to the beam azimuth pointing to the candidate base station;
and taking the beam closest to the normal as an optimal service beam, and taking a base station corresponding to the optimal service beam as a target base station.
Further, the residence module 5 is specifically configured to:
if the optimal service beam selected by the selection module 4 is the beam corresponding to the azimuth angle of the current beam of the uplink service, judging that the terminal has selected the optimal service beam and keeping residing in the current carrier and the base station;
if the optimal service beam selected by the selection module 4 is not the beam corresponding to the azimuth angle of the current service beam, reporting the target base station corresponding to the optimal service beam to the current base station, so that the current base station skips the pilot frequency measurement flow, and the base station switching operation is scheduled to be completed, so that the terminal resides in the working frequency band of the target base station.
The method for selecting a carrier aggregation cell primary carrier in the first embodiment of the method is relatively simple, and may be specifically described with reference to the related description in the first embodiment of the method, which is not repeated herein.
In addition, the embodiment of the disclosure also provides a system for selecting a carrier aggregation cell main carrier, which comprises a base station and any one of the terminals.
The base station comprises a request receiving unit and a starting indicating unit; the request receiving unit is configured to receive and process a request for the terminal to rapidly switch the target base station; the starting indication unit is set to instruct the base station scheduler to skip the measurement flow to switch the base station.
Furthermore, the embodiment of the disclosure also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the possible methods.
Furthermore, embodiments of the present disclosure provide a computer-readable storage medium having stored therein computer-executable instructions that, when executed by at least one processor of a user device, perform the various possible methods described above.
Among them, computer-readable media include computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC (Application Specific Integrated Circuit ). In addition, the ASIC may reside in a user device. The processor and the storage medium may reside as discrete components in a communication device.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.

Claims (6)

1. A method for selecting a carrier aggregation cell primary carrier, applied to a terminal side, comprising:
periodically reading the current beam azimuth angle of the uplink service, and judging whether the current beam azimuth angle is in a critical state or not;
if yes, starting to monitor other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search candidate base stations for use;
calculating a beam azimuth angle pointing to the candidate base station through a terminal array antenna;
selecting a target base station according to the current beam azimuth angle of the uplink service and the beam azimuth angle pointing to the candidate base station;
camping on the target base station;
the selecting the target base station according to the current beam azimuth of the uplink service and the beam azimuth pointing to the candidate base station comprises:
selecting the beam closest to the normal line from the beam corresponding to the current beam azimuth of the uplink service and the beam corresponding to the beam azimuth pointing to the candidate base station;
taking the beam closest to the normal as an optimal service beam, and taking a base station corresponding to the optimal service beam as a target base station;
the camping on the target base station comprises:
if the optimal service beam is the beam corresponding to the current beam azimuth angle of the uplink service, judging that the terminal has selected the optimal service beam and remaining resident in the current carrier and the base station;
if the optimal service beam is not the beam corresponding to the current beam azimuth angle of the uplink service, reporting the target base station corresponding to the optimal service beam to the current base station, so that the current base station skips the pilot frequency measurement flow, the base station switching operation is scheduled to be completed, and the terminal resides in the working frequency band of the target base station.
2. The method of claim 1, wherein said determining whether the current beam azimuth angle is in a critical state comprises:
judging whether a service beam of the uplink service is still in the capacity range of antenna beam forming, and judging whether an angle difference value between the current beam azimuth angle of the uplink service and the boundary of the capacity range of antenna beam forming is in a preset threshold value;
and if the current beam azimuth angle is in the critical state, judging that the current beam azimuth angle is in the critical state.
3. A terminal, comprising:
the terminal service beam sensing module is used for periodically reading the current beam azimuth angle of the uplink service and judging whether the current beam azimuth angle is in a critical state or not;
the base station interception module is configured to, if the terminal service beam perception module judges that the current beam azimuth is in a critical state, begin to intercept other working frequency bands except the working frequency bands of the current main carrier and the auxiliary carrier so as to search for available candidate base stations;
a calculation module arranged to calculate a beam azimuth directed to the candidate base station by a terminal array antenna;
a selecting module, configured to select a target base station according to a current beam azimuth of the uplink service and a beam azimuth directed to the candidate base station;
a camping module configured to camp a terminal on the target base station;
the selection module is specifically configured to:
selecting the beam closest to the normal line from the beam corresponding to the current beam azimuth of the uplink service and the beam corresponding to the beam azimuth pointing to the candidate base station;
taking the beam closest to the normal as an optimal service beam, and taking a base station corresponding to the optimal service beam as a target base station;
the residence module is specifically configured as follows:
if the optimal service beam selected by the selection module is the beam corresponding to the azimuth angle of the current beam of the uplink service, judging that the terminal has selected the optimal service beam and keeping residing in the current carrier and the base station;
if the optimal service beam selected by the selection module is not the beam corresponding to the azimuth angle of the current uplink service beam, reporting the target base station corresponding to the optimal service beam to the current base station, so that the current base station skips the pilot frequency measurement flow, the base station switching operation is scheduled and completed, and the terminal resides in the working frequency band of the target base station.
4. A terminal according to claim 3, wherein the terminal service beam sensing module is specifically configured to:
judging whether a service beam of the uplink service is still in the capacity range of antenna beam forming, and judging whether an angle difference value between the current beam azimuth angle of the uplink service and the boundary of the capacity range of antenna beam forming is in a preset threshold value;
and if the current beam azimuth angle is in the critical state, judging that the current beam azimuth angle is in the critical state.
5. A computer device comprising a memory and a processor, the memory having stored therein a computer program, which when executed by the processor performs the method of selecting carrier aggregation cell primary carriers according to claim 1 or 2.
6. A computer-readable storage medium, comprising: computer program which, when run on a computer, causes the computer to perform the method of selecting carrier aggregation cell primary carriers according to claim 1 or 2.
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