CN117956531A

CN117956531A - Base station switching method, device and system

Info

Publication number: CN117956531A
Application number: CN202211287026.XA
Authority: CN
Inventors: 韩丽; 李必奇; 曲峰
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2024-04-30

Abstract

The invention provides a base station switching method, device and system, and belongs to the technical field of communication. The base station switching method is applied to a service macro base station, the service macro base station controls a plurality of micro base stations, and the base station switching method comprises the following steps: receiving a measurement report of a service micro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station; when the first measurement quantity is lower than a preset first threshold value, determining whether the target micro base station is a micro base station controlled by the target micro base station; and if the target micro base station is the micro base station controlled by the target micro base station, switching the use frequency of the target micro base station into the use frequency of the service micro base station. The invention can improve the success rate of terminal switching and ensure that the service of the terminal is not interrupted.

Description

Base station switching method, device and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a base station switching method, device, and system.

Background

When the location of a mobile terminal using network services changes, the mobile terminal moves from one cell to another cell, or due to the reasons of adjusting the load of wireless transmission service, maintenance activation operation, equipment failure, etc., in order to ensure the uninterrupted communication and the quality of service, the communication link between the mobile terminal and the original serving base station needs to be switched to a new target cell, which is called handover.

When the mobile terminal moves rapidly, for example, the mobile terminal is located on a high-speed rail, the time that the mobile terminal stays in the same cell is very short, and the mobile terminal needs to be rapidly switched to a new target cell, but the switching time required by the existing switching algorithm is relatively long, so that the situation that the mobile terminal moves rapidly cannot be met, the success rate of switching of the mobile terminal is reduced, and the probability of communication interruption of the mobile terminal is increased.

Disclosure of Invention

The invention aims to solve the technical problem of providing a base station switching method, a base station switching device and a base station switching system, which can improve the success rate of terminal switching and ensure that the service of a terminal is not interrupted.

In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:

In one aspect, a base station switching method is provided, and is applied to a serving macro base station, where the serving macro base station controls a plurality of micro base stations, and the base station switching method includes:

Receiving a measurement report of a service micro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station;

When the first measurement quantity is lower than a preset first threshold value, determining whether the target micro base station is a self-controlled micro base station or not;

And if the target micro base station is the micro base station controlled by the target micro base station, switching the use frequency of the target micro base station into the use frequency of the service micro base station.

In some embodiments, before the receiving the measurement report of the serving micro base station, the method further includes:

Mapping a plurality of frequencies to wavelengths used by a plurality of micro base stations controlled by the micro base stations, and modulating signals of corresponding wavelengths by using the frequencies;

Combining the modulated signals with a plurality of wavelengths into a first signal, and transmitting the first signal to a plurality of micro base stations controlled by the micro base stations;

The different micro base stations use different wavelengths, and frequencies corresponding to adjacent micro base stations are different.

In some embodiments, after the determining whether the target micro base station is a self-controlled micro base station, the method further includes:

If the target micro base station is not a self-controlled micro base station, judging whether the terminal moves in a direction away from the service micro base station;

if the terminal moves in a direction away from the service micro base station, sending a switching request to the target macro base station, wherein the switching request comprises an identifier of the terminal, occupied resources and a used frequency band;

receiving a switching response returned by the target macro base station;

And switching the terminal to the target micro base station, and switching the terminal to the target macro base station when the second measurement quantity is lower than a preset second threshold value.

In some embodiments, the determining whether the terminal moves away from the serving micro base station includes:

judging whether the terminal moves in a direction away from the service micro base station or not according to the transmitting frequency of the service micro base station, the speed of the terminal and the included angle between the service micro base station and the movement direction of the terminal.

In some embodiments, the second threshold is lower than the first threshold.

The embodiment of the invention also provides a base station switching method which is applied to the service micro base station, wherein the service micro base station is one of a plurality of micro base stations controlled by the service macro base station, and the base station switching method comprises the following steps:

Receiving a measurement result sent by a terminal;

Transmitting a measurement report to the service macro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station;

And when the first measurement quantity is lower than a preset first threshold value and the use frequency of the target micro base station is consistent with the use frequency of the target micro base station, routing the data packet of the terminal to the target micro base station.

In some embodiments, before the sending the measurement report to the serving macro base station, the method further includes:

receiving a first signal sent by the service macro base station, wherein the first signal comprises signals with a plurality of wavelengths after combination, and the signals with the plurality of wavelengths are modulated by different frequencies;

the first signal is demultiplexed, signals on a first wavelength in the first signal are demodulated, the use frequency of the first signal is determined, and the first wavelength is the wavelength used by the service micro base station;

In some embodiments, the method further comprises:

When the first measurement quantity is lower than a preset first threshold value and the use frequency of the target micro base station is inconsistent with the self use frequency;

judging whether the terminal moves in a direction away from the service micro base station;

and if the terminal moves in a direction away from the service micro base station, switching the terminal to the target micro base station.

The embodiment of the invention also provides a base station switching device, which is applied to a service macro base station, wherein the service macro base station controls a plurality of micro base stations, and the base station switching device comprises:

the first receiving module is used for receiving a measurement report of a service micro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station;

The determining module is used for determining whether the target micro base station is a micro base station controlled by the target micro base station or not when the first measurement quantity is lower than a preset first threshold value;

and the processing module is used for switching the use frequency of the target micro base station into the use frequency of the service micro base station if the target micro base station is the micro base station controlled by the processing module.

In some embodiments, the base station switching apparatus further includes:

The modulation module is used for mapping a plurality of frequencies to the wavelengths used by the micro base stations controlled by the modulation module, and modulating signals of the corresponding wavelengths by utilizing the frequencies;

the first transmitting module is used for combining the modulated signals with the multiple wavelengths into a first signal and transmitting the first signal to the multiple micro base stations controlled by the first transmitting module;

The embodiment of the invention also provides a base station switching device, which is applied to a service micro base station, wherein the service micro base station is one of a plurality of micro base stations controlled by a service macro base station, and the base station switching device comprises:

the second receiving module is used for receiving the measurement result sent by the terminal;

The second sending module is used for sending a measurement report to the service macro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station;

and the switching module is used for routing the data packet of the terminal to the target micro base station when the first measurement quantity is lower than a preset first threshold value and the use frequency of the target micro base station is consistent with the use frequency of the target micro base station.

In some embodiments, the second receiving module is further configured to receive a first signal sent by the serving macro base station, where the first signal includes signals of multiple wavelengths after being combined, and the signals of multiple wavelengths are modulated with different frequencies;

the base station switching device further includes:

the demodulation module is used for demultiplexing the first signals, demodulating signals on a first wavelength in the first signals, and determining the use frequency of the signals, wherein the first wavelength is the wavelength used by the service micro base station;

The embodiment of the invention also provides a base station switching system, which comprises:

the system comprises a service macro base station, a plurality of micro base stations and a plurality of micro base stations, wherein the service macro base station controls the plurality of micro base stations and is used for receiving measurement reports of the service micro base stations, the measurement reports comprise measurement results of terminals, and the measurement results comprise first measurement amounts of the service micro base stations and second measurement amounts of the service macro base stations; when the first measurement quantity is lower than a preset first threshold value, determining whether the target micro base station is a self-controlled micro base station or not; if the target micro base station is a self-controlled micro base station, switching the use frequency of the target micro base station into the use frequency of the service micro base station;

The service micro base station is one of a plurality of micro base stations controlled by a service macro base station and is used for receiving a measurement result sent by a terminal; transmitting a measurement report to the service macro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station; and when the first measurement quantity is lower than a preset first threshold value and the use frequency of the target micro base station is consistent with the use frequency of the target micro base station, routing the data packet of the terminal to the target micro base station.

In some embodiments, the serving macro base station is further configured to map a plurality of frequencies to wavelengths used by a plurality of micro base stations controlled by the serving macro base station, and modulate signals of corresponding wavelengths with the frequencies; combining the modulated signals with a plurality of wavelengths into a first signal, and transmitting the first signal to a plurality of micro base stations controlled by the micro base stations;

The service micro base station is further configured to receive a first signal sent by the service macro base station, where the first signal includes signals with multiple wavelengths after being combined, and the signals with multiple wavelengths are modulated by using different frequencies; the first signal is demultiplexed, signals on a first wavelength in the first signal are demodulated, the use frequency of the first signal is determined, and the first wavelength is the wavelength used by the service micro base station;

Embodiments of the present invention also provide a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the base station handover method as described above.

The embodiment of the invention has the following beneficial effects:

In the scheme, when the switching between the micro base stations is performed under the same macro base station, the use frequency of the target micro base station is switched to the use frequency of the service micro base station, so that the working frequency band of the terminal does not need to be changed, the terminal does not need to interrupt the connection with the original service micro base station, tune to a new frequency and then get in contact with the target micro base station, the short-time communication interruption possibly occurring in the switching process is avoided, and the switching speed of the terminal can be improved. Through the technical scheme of the embodiment, the switching times among macro base stations can be reduced, so that the switching success probability is further improved, and the communication continuity is ensured.

Drawings

Fig. 1 is a flow chart of a method for serving macro base station side base station handover according to an embodiment of the present invention;

fig. 2 is a schematic diagram of network architecture of macro base stations and micro base stations according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a serving macro base station mapping a plurality of frequencies to a plurality of wavelengths according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a serving macro base station transmitting signals to a micro base station according to an embodiment of the present invention;

fig. 5 is a flow chart of a method for switching a base station on a serving micro base station according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a base station switching device on a macro base station side according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a base station switching device at a serving micro base station according to an embodiment of the present invention;

fig. 8 is a schematic diagram of the composition of the terminal;

Fig. 9 is a schematic diagram of the composition of a base station.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention more apparent, the following detailed description will be given with reference to the accompanying drawings and the specific embodiments.

The embodiment of the invention provides a base station switching method, a base station switching device and a base station switching system, which can improve the success rate of mobile terminal switching and ensure that the service of a mobile terminal is not interrupted.

An embodiment of the present invention provides a base station switching method, which is applied to a serving macro base station, where the serving macro base station controls a plurality of micro base stations, as shown in fig. 1, and includes:

Step 101: receiving a measurement report of a service micro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station;

In this embodiment, in order to improve the success rate of handover of the terminal and ensure the continuity of communication, as shown in fig. 2, a network architecture of macro base station 10+micro base station 11 is adopted, and 1 macro base station 10 controls a plurality of micro base stations 11, so that the radio frequency coverage of the macro base station 10 can be enlarged. The 1 macro base station 10 can control 2 or more micro base stations 11, the macro base station sends measurement control commands to the micro base stations, the micro base stations forward the measurement control commands to the terminal, the terminal periodically sends measurement results to the service micro base stations, and the service micro base stations report the measurement results to the service macro base stations. The service micro base station is a micro base station which provides service for the terminal currently, and the service macro base station is a macro base station which controls the service micro base station.

The measurement result of the terminal may include a first measurement amount of the serving micro base station, a second measurement amount of the serving macro base station, a third measurement amount of the target macro base station, and a fourth measurement amount of the target micro base station, where the target micro base station is a micro base station to be switched after the service quality of the current serving micro base station of the terminal drops to a certain extent, and the target macro base station is a macro base station for controlling the target micro base station.

In addition to reporting the measurement result of the terminal to the serving macro base station, the serving micro base station may also report its own base station identifier to the serving macro base station, and report the base station identifier of the target micro base station to the serving macro base station.

Specifically, the terminal may report measurement amounts of a plurality of micro base stations to the service micro base station, the service micro base station may report the measurement amounts of the micro base stations as measurement amounts of candidate target micro base stations to the service macro base station, the service macro base station maintains a candidate target micro base station list according to the measurement amounts of the micro base stations, wherein the base station identifier of the candidate target micro base station and the corresponding measurement amounts are recorded, the service macro base station monitors a change condition of the measurement amounts of each candidate target micro base station according to a measurement report reported by the service micro base station, may determine a movement trend of the terminal according to the change condition, and periodically update the candidate target micro base station list, specifically, may select a candidate target micro base station with the best measurement amount in the candidate target micro base station list as a target micro base station, and the service macro base station may send the base station identifier of the target micro base station to the service micro base station, and report a third measurement amount of the target micro base station by the service micro base station; or the service micro base station selects the micro base station with the best measurement quantity as a target micro base station according to the measurement quantity of a plurality of micro base stations reported by the terminal, and reports a third measurement quantity of the target micro base station to the service macro base station. When the embodiment is applied to a high-speed railway scene, the base stations along the railway are in linear coverage, and the micro base station in the terminal advancing direction can be generally considered as a target micro base station, and the next macro base station is considered as a target macro base station.

The measurement may specifically use reference signal received Power (REFERENCE SIGNAL RECEIVED Power, RSRP), and of course, the measurement is not limited to RSRP, and may also use other parameters, such as signal-to-noise ratio, as long as the current communication quality of the terminal can be measured.

Step 102: when the first measurement quantity is lower than a preset first threshold value, determining whether the target micro base station is a micro base station controlled by the target micro base station;

And when the first measurement quantity is lower than a preset first threshold value, the communication quality of the terminal at the current serving micro base station is poor, and the terminal needs to be switched.

The service macro base station side stores the base station identification of the micro base station controlled by the service macro base station, and the service macro base station can judge whether the target micro base station is the micro base station controlled by the service macro base station according to the stored base station identification.

Or the service macro base station can also judge whether the target micro base station is the micro base station controlled by the service micro base station according to whether the service micro base station is the last micro base station controlled by the service micro base station or not, and can judge that the target micro base station is the micro base station controlled by the service micro base station when the service micro base station is not the last micro base station controlled by the service micro base station; when the serving micro base station is the last micro base station under the control of the serving micro base station, the target micro base station can be judged not to be the micro base station controlled by the serving micro base station.

The service macro base station stores the base station identification and the position information of the micro base station controlled by the service macro base station, and can judge whether the service micro base station is the last micro base station under the control of the service macro base station according to the position information of the service micro base station, for example, the service micro base station is the micro base station at the edge in the coverage area of the service macro base station according to the position information of the service micro base station, and can judge that the service micro base station is the last micro base station under the control of the service macro base station; and judging that the service micro base station is the micro base station in the middle of the coverage range of the service macro base station according to the position information of the service micro base station, and judging that the service micro base station is not the last micro base station under the control of the service micro base station.

Step 103: and if the target micro base station is the micro base station controlled by the target micro base station, switching the use frequency of the target micro base station into the use frequency of the service micro base station.

If the target micro base station is the micro base station controlled by the service macro base station or the service micro base station is not the last micro base station controlled by the service macro base station, the terminal does not need to switch between macro base stations, but only needs to switch between micro base stations under the same macro base station.

In order to ensure the success rate of the handover, in this embodiment, when the handover is performed between the micro base stations under the same macro base station, the frequency of use of the target micro base station is switched to the frequency of use of the serving micro base station, so that the working frequency band of the terminal does not need to be changed, the terminal does not need to interrupt the connection with the original serving micro base station, tune to a new frequency, and then get in contact with the target micro base station, thereby avoiding short-time interruption of communication which may occur in the handover process, and improving the handover speed of the terminal. Through the technical scheme of the embodiment, the switching times among macro base stations can be reduced, so that the switching success probability is further improved, and the communication continuity is ensured.

In order to realize the switching between the micro base stations under the same macro base station, in the embodiment, the service macro base station needs to map a plurality of frequencies to the wavelengths used by a plurality of micro base stations controlled by the service macro base station, and modulates the signals of the corresponding wavelengths by using the frequencies; combining the modulated signals with a plurality of wavelengths into a first signal, and transmitting the first signal to a plurality of micro base stations controlled by the micro base stations; the different micro base stations use different wavelengths, and frequencies corresponding to adjacent micro base stations are different.

As shown in fig. 3 and 4, the serving macro base station controls four micro base stations, each micro base station corresponds to a fixed wavelength, and the micro base station demodulates only signals on the corresponding fixed wavelength, for example, the micro base station n1 demodulates only signals on the fixed wavelength λ1, the micro base station n2 demodulates only signals on the fixed wavelength λ2, the micro base station n3 demodulates only signals on the fixed wavelength λ3, and the micro base station n4 demodulates only signals on the fixed wavelength λ4. In order to prevent co-channel interference, the serving macro base station modulates signals of multiple wavelengths with different frequencies, for example, four micro base stations can correspond to four different frequencies, and in order to save spectrum resources, four micro base stations can also correspond to three different frequencies, so long as the frequencies corresponding to the adjacent micro base stations are ensured to be different. As shown in fig. 3, four micro base stations may be modulated with frequencies f1, f2, f3, at time a, the four micro base stations corresponding to frequencies f1, f2, f3, f1, respectively, serving macro base stations activating radio frequency switches to modulate signals at wavelength λ1 with a selected frequency f1, modulating signals at wavelength λ2 with a selected frequency f2, modulating signals at wavelength λ3 with a selected frequency f3, modulating signals at wavelength λ4 with a selected frequency f 1; and combining the multiplexed signals through a wavelength division multiplexer to obtain a first signal, and transmitting the first signal to the four micro base stations. The micro base station n1 receives the first signal, demultiplexes, and the micro base station n1 only demodulates the signal with the fixed wavelength lambda 1 to obtain the frequency f1 modulated on the wavelength lambda 1, and updates the frequency f1 to the current frequency of the micro base station n 1; the micro base station n2 receives the first signal, demultiplexes, and the micro base station n2 only demodulates the signal with the fixed wavelength lambda 2 to obtain the frequency f2 modulated on the wavelength lambda 2, and updates the frequency f2 into the current frequency of the micro base station n 2; the micro base station n3 receives the first signal, demultiplexes, and the micro base station n3 only demodulates the signal with the fixed wavelength lambda 3 to obtain the frequency f3 modulated on the wavelength lambda 3, and updates the frequency f3 into the current frequency of the micro base station n 3; the micro base station n4 receives the first signal, demultiplexes, and the micro base station n4 only demodulates the signal on the fixed wavelength lambda 4 to obtain the frequency f1 modulated on the wavelength lambda 4, and updates the frequency f1 to the current frequency.

If the current serving micro base station is the micro base station n1 and the target micro base station to be switched by the terminal is the micro base station n2, the frequency of the micro base station n2 can be updated to f1, and the frequency is consistent with the micro base station n 1. As shown in fig. 3 and fig. 4, at time B, the terminal needs to be switched from the micro base station n1 to the micro base station n2, the micro base station n1 and the micro base station n2 are controlled by the same macro base station, and the macro base station controls the frequency mapping sequence through the radio frequency switch, so that the four micro base stations respectively correspond to the frequencies f1, f1, f2 and f3, and the service macro base station starts the radio frequency switch to modulate the signal on the wavelength λ1 with the selected frequency f1, modulate the signal on the wavelength λ2 with the selected frequency f1, modulate the signal on the wavelength λ3 with the selected frequency f2, and modulate the signal on the wavelength λ4 with the selected frequency f 3; and combining the multiplexed signals through a wavelength division multiplexer to obtain a first signal, and transmitting the first signal to the four micro base stations. The micro base station n1 receives the first signal, demultiplexes, and the micro base station n1 only demodulates the signal with the fixed wavelength lambda 1 to obtain the frequency f1 modulated on the wavelength lambda 1, and updates the frequency f1 to the current frequency of the micro base station n 1; the micro base station n2 receives the first signal, demultiplexes, and the micro base station n2 only demodulates the signal with the fixed wavelength lambda 2 to obtain the frequency f1 modulated on the wavelength lambda 2, and updates the frequency f1 into the current frequency of the micro base station n 2; the micro base station n3 receives the first signal, demultiplexes, and the micro base station n3 only demodulates the signal with the fixed wavelength lambda 3 to obtain the frequency f2 modulated on the wavelength lambda 3, and updates the frequency f2 into the current frequency of the micro base station n 3; the micro base station n4 receives the first signal, demultiplexes, and the micro base station n4 only demodulates the signal on the fixed wavelength lambda 4 to obtain the frequency f3 modulated on the wavelength lambda 4, and updates the frequency f3 to the current frequency. At this time, frequencies used by the micro base stations n1, n2, n3 and n4 are f1, f2 and f3, respectively, thereby realizing switching of the frequency of use of the target micro base station to the frequency of use of the serving micro base station.

After the handover is completed, in order to avoid co-channel interference, the frequency of the micro base station n1 may be adjusted to be different from f1, for example, may be f2 or f3.

Because the frequency of the micro base station n2 is along with the frequency f1 of the service micro base station n1, the terminal does not need to interrupt the connection with the original micro base station, tune to a new frequency and then get in contact with the new micro base station, so that short-time communication interruption possibly occurring in the switching process is avoided.

The present embodiment is described by taking the serving macro base station as an example to control four micro base stations, and of course, the serving macro base station is not limited to controlling four micro base stations, and may control more or fewer micro base stations.

After the use frequency of the target micro base station is switched to the use frequency of the service micro base station, the service micro base station transmits the terminal related information to the target micro base station in a signaling mode, and directly switches the downlink flow of the service micro base station to the target micro base station, and then reroutes all upcoming and buffered data packets to the port of the target micro base station, so that the switching is completed. The terminal related information includes identity information of the terminal, resource information required by the terminal, and the like.

In this embodiment, if the target micro base station is not a micro base station controlled by itself, a handover between macro base stations is required. Firstly, judging whether the terminal moves in a direction away from the service micro base station; if the terminal moves in a direction away from the service micro base station, sending a switching request to the target macro base station, wherein the switching request comprises an identifier of the terminal, occupied resources and a used frequency band; receiving a switching response returned by the target macro base station; and switching the terminal to the target micro base station, and switching the terminal to the target macro base station when the second measurement quantity is lower than a preset second threshold value.

Whether the terminal moves away from the service micro base station can be judged according to the transmitting frequency of the service micro base station, the speed of the terminal and the included angle between the service micro base station and the movement direction of the terminal, and when the terminal is positioned on a train, the included angle is the included angle between the connecting line between the service micro base station and the train and the movement direction of the train.

The specific method is to calculate Doppler frequency shift fr: fr=fs (1+2v·cos θ/c), where fs is the emission frequency of the source micro base station, c is the speed of light, v is the speed of the terminal, and θ is the angle between the serving micro base station and the direction of motion of the terminal. When the terminal is far from the serving micro base station, the doppler shift is negative and its absolute value becomes larger and larger. Therefore, whether the terminal moves in a direction away from the service micro base station can be judged through Doppler frequency shift.

When the terminal is determined to move in a direction away from the service micro base station, the service macro base station sends a switching request to the target macro base station in advance, so that the target macro base station and the target micro base station can perform admission control in advance, and whether sufficient resources are provided for the terminal is judged, wherein the switching request can comprise the identification of the terminal, occupied resources, used frequency bands and the like; and after the admission control is completed and the resources are reserved, the target macro base station transmits a switching response to the service macro base station.

And when the signal intensity from the serving micro base station is lower than a second threshold value, switching between macro base stations is performed. According to the actual scene, the micro base station switching threshold (i.e. the first threshold) and the macro base station switching threshold (the second threshold) are adjusted, for example, the second threshold is set to be lower than the first threshold, so that the micro base station switching occurs before the macro base station, and the macro base station switching occurs after the micro base station switching is completed, thus ensuring that the terminal still keeps communication with at least one of the macro base station and the micro base station during the switching period, and avoiding communication interruption of the terminal. After the switching is completed, the terminal can synchronize with the target micro base station and release the channel resources occupied on the frequency domain and the time domain.

The technical scheme of the embodiment can be applied to a scene of high-speed movement of the terminal, such as that the terminal is positioned on a high-speed rail or the terminal is a high-speed rail, and of course, the technical scheme of the embodiment is not limited to be applied to a scene of high-speed movement of the terminal, and can be applied to a scene of low-speed movement of the terminal.

The embodiment of the invention also provides a base station switching method, which is applied to a service micro base station, wherein the service micro base station is one of a plurality of micro base stations controlled by a service macro base station, as shown in fig. 5, and the base station switching method comprises the following steps:

step 201: receiving a measurement result sent by a terminal;

The measurement result of the terminal may include a first measurement amount of the serving micro base station, a second measurement amount of the serving macro base station, a third measurement amount of the target macro base station, and a fourth measurement amount of the target micro base station, where the target micro base station is a micro base station to be switched after the service quality of the current serving micro base station of the terminal drops to a certain extent, and the target macro base station is a macro base station for controlling the target micro base station. When the embodiment is applied to a high-speed railway scene, the base stations along the railway are in linear coverage, and the micro base station in the terminal advancing direction can be generally considered as a target micro base station, and the next macro base station is considered as a target macro base station.

Step 202: transmitting a measurement report to the service macro base station, wherein the measurement report comprises a measurement result of a terminal, and the measurement result comprises a first measurement quantity of the service micro base station and a second measurement quantity of the service macro base station;

Specifically, the terminal may report measurement amounts of a plurality of micro base stations to the service micro base station, the service micro base station may report the measurement amounts of the micro base stations as measurement amounts of candidate target micro base stations to the service macro base station, the service macro base station maintains a candidate target micro base station list according to the measurement amounts of the micro base stations, wherein the base station identifier of the candidate target micro base station and the corresponding measurement amounts are recorded, the service macro base station monitors a change condition of the measurement amounts of each candidate target micro base station according to a measurement report reported by the service micro base station, may determine a movement trend of the terminal according to the change condition, and periodically update the candidate target micro base station list, specifically, may select a candidate target micro base station with the best measurement amount in the candidate target micro base station list as a target micro base station, and the service macro base station may send the base station identifier of the target micro base station to the service micro base station, and report a third measurement amount of the target micro base station by the service micro base station; or the service micro base station selects the micro base station with the best measurement quantity as a target micro base station according to the measurement quantity of a plurality of micro base stations reported by the terminal, and reports a third measurement quantity of the target micro base station to the service macro base station.

Step 203: and when the first measurement quantity is lower than a preset first threshold value and the use frequency of the target micro base station is consistent with the use frequency of the target micro base station, routing the data packet of the terminal to the target micro base station.

In order to realize the switching between the micro base stations under the same macro base station, in this embodiment, a service micro base station receives a first signal sent by the service macro base station, where the first signal includes signals with multiple wavelengths after being combined, and the signals with multiple wavelengths are modulated by using different frequencies; the first signal is demultiplexed, signals on a first wavelength in the first signal are demodulated, the use frequency of the first signal is determined, and the first wavelength is the wavelength used by the service micro base station; the different micro base stations use different wavelengths, and frequencies corresponding to adjacent micro base stations are different.

In this embodiment, if the target micro base station is not a micro base station controlled by itself, a handover between macro base stations is required. When the first measurement quantity is lower than a preset first threshold value and the use frequency of the target micro base station is inconsistent with the self use frequency; judging whether the terminal moves in a direction away from the service micro base station; and if the terminal moves in a direction away from the service micro base station, switching the terminal to the target micro base station.

The embodiment of the invention also provides a base station switching device, which is applied to a service macro base station, wherein the service macro base station controls a plurality of micro base stations, as shown in fig. 6, and the base station switching device comprises:

a first receiving module 31, configured to receive a measurement report of a serving micro base station, where the measurement report includes a measurement result of a terminal, and the measurement result includes a first measurement quantity of the serving micro base station and a second measurement quantity of the serving macro base station;

A determining module 32, configured to determine whether the target micro base station is a micro base station controlled by itself when the first measurement quantity is lower than a preset first threshold value;

And the processing module 33 is configured to switch the frequency of use of the target micro base station to the frequency of use of the serving micro base station if the target micro base station is a micro base station controlled by the target micro base station.

In some embodiments, the base station switching apparatus further includes:

In some embodiments, the processing module 33 is further configured to determine whether the terminal moves away from the serving micro base station if the target micro base station is not a self-controlled micro base station; if the terminal moves in a direction away from the service micro base station, sending a switching request to the target macro base station, wherein the switching request comprises an identifier of the terminal, occupied resources and a used frequency band; receiving a switching response returned by the target macro base station; and switching the terminal to the target micro base station, and switching the terminal to the target macro base station when the second measurement quantity is lower than a preset second threshold value.

The processing module 33 is specifically configured to determine whether the terminal moves in a direction away from the serving micro base station according to the transmitting frequency of the serving micro base station, the speed of the terminal, and an included angle between the serving micro base station and the moving direction of the terminal.

The embodiment of the invention also provides a base station switching device, which is applied to a serving micro base station, wherein the serving micro base station is one of a plurality of micro base stations controlled by a serving macro base station, as shown in fig. 7, and the base station switching device comprises:

a second receiving module 41, configured to receive a measurement result sent by the terminal;

A second sending module 42, configured to send a measurement report to the serving macro base station, where the measurement report includes a measurement result of a terminal, and the measurement result includes a first measurement quantity of the serving micro base station and a second measurement quantity of the serving macro base station;

And the switching module 43 is configured to route the data packet of the terminal to the target micro base station when the first measurement quantity is lower than a preset first threshold value and the usage frequency of the target micro base station is consistent with the own usage frequency.

the base station switching device further includes:

In some embodiments, the switching module 43 is further configured to, when the first measurement quantity is lower than a preset first threshold value and the usage frequency of the target micro base station is inconsistent with the own usage frequency; judging whether the terminal moves in a direction away from the service micro base station; and if the terminal moves in a direction away from the service micro base station, switching the terminal to the target micro base station.

In some embodiments, the switching module 43 is specifically configured to determine whether the terminal moves in a direction away from the serving micro base station according to a transmission frequency of the serving micro base station, a speed of the terminal, and an included angle between the serving micro base station and a movement direction of the terminal.

The system comprises a service macro base station, a plurality of micro base stations and a plurality of micro base stations, wherein the service macro base station controls the plurality of micro base stations and is used for receiving measurement reports of the service micro base stations, the measurement reports comprise measurement results of terminals, and the measurement results comprise first measurement amounts of the service micro base stations and second measurement amounts of the service macro base stations; when the first measurement quantity is lower than a preset first threshold value, determining whether the target micro base station is a micro base station controlled by the target micro base station; if the target micro base station is a self-controlled micro base station, switching the use frequency of the target micro base station into the use frequency of the service micro base station;

In this embodiment, when the handover is performed under the same macro base station and between the micro base stations, the frequency of use of the target micro base station is switched to the frequency of use of the serving micro base station, so that the working frequency band of the terminal does not need to be changed, the terminal does not need to interrupt the connection with the original serving micro base station, tune to a new frequency, and then get in contact with the target micro base station, thereby avoiding short-time interruption of communication which may occur in the handover process, and improving the handover speed of the terminal. Through the technical scheme of the embodiment, the switching times among macro base stations can be reduced, so that the switching success probability is further improved, and the communication continuity is ensured.

In this embodiment, as shown in fig. 8, the macro base station includes an antenna system, a radio frequency unit, an interface processing unit, a baseband system, a control system, a transmission system, and the like, where the transmission system can communicate with a core network element AMF and a UPF, and the radio frequency unit includes a wavelength division multiplexer, a filter, PALNA, and the like. The antenna system comprises an antenna, a feeder line, a jumper wire and other devices and is used for receiving and transmitting radio frequency signals. The radio frequency unit is mainly responsible for the functions of modulation and demodulation, data processing, combining and branching and the like of radio frequency signals and baseband signals. The interface processing unit, the baseband system, the control system and the transmission system complete the processing of baseband signals and signaling together, perform functions of encoding and decoding, checking, correcting errors and the like on various data, and perform signaling exchange with the core network. The architecture of the micro base station refers to the architecture of the macro base station, and will not be described here.

As shown in fig. 9, the terminal may include an antenna, a switch, a duplexer, a filter, an LNA, a PA, a transceiver chip, a baseband chip, and the like. The antenna is responsible for receiving electromagnetic waves, the transceiver chip is responsible for mutually converting electromagnetic wave signals and binary digital numbers, the baseband chip is responsible for modulating intermediate frequency signals into baseband signals for processing, and the radio control functions such as signal generation, modulation, coding and frequency shift are managed.

The measurement result of the terminal may include a first measurement amount of the serving micro base station, a second measurement amount of the serving macro base station, a third measurement amount of the target macro base station, and a fourth measurement amount of the target micro base station, where the target micro base station is a micro base station to be switched after the service quality of the current serving micro base station of the terminal drops to a certain extent, and the target macro base station is a macro base station for controlling the target micro base station. In addition to reporting the measurement result of the terminal to the serving macro base station, the serving micro base station may also report its own base station identifier to the serving macro base station, and report the base station identifier of the target micro base station to the serving macro base station.

The specific method is to calculate Doppler frequency shift fr: fr=fs (1+2v·cos θ/c), where fs is the emission frequency of the source micro base station, c is the speed of light, v is the speed of the terminal, and is the angle between the serving micro base station and the direction of motion of the terminal. When the terminal is far from the serving micro base station, the doppler shift is negative and its absolute value becomes larger and larger. Therefore, whether the terminal moves in a direction away from the service micro base station can be judged through Doppler frequency shift.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip comprises a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running programs or instructions, the processes of the base station switching method embodiment can be realized, the same technical effects can be achieved, and the repetition is avoided, and the repeated description is omitted.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product stored in a storage medium, where the computer program/program product is executed by at least one processor to implement each process of the above-mentioned base station handover method embodiment, and achieve the same technical effects, and are not repeated herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A base station switching method, applied to a serving macro base station, the serving macro base station controlling a plurality of micro base stations, the base station switching method comprising:

2. The base station handover method according to claim 1, wherein before the receiving the measurement report of the serving micro base station, the method further comprises:

3. The base station switching method according to claim 1, wherein after said determining whether the target micro base station is a self-controlled micro base station, the method further comprises:

receiving a switching response returned by the target macro base station;

4. The base station switching method according to claim 3, wherein the determining whether the terminal moves in a direction away from the serving micro base station comprises:

5. A base station handover method according to claim 3, wherein the second threshold is lower than the first threshold.

6. A base station switching method, which is applied to a serving micro base station, wherein the serving micro base station is one of a plurality of micro base stations controlled by a serving macro base station, the base station switching method comprising:

Receiving a measurement result sent by a terminal;

7. The base station handover method according to claim 6, wherein before the sending of the measurement report to the serving macro base station, the method further comprises:

8. The base station switching method according to claim 6, further comprising:

9. The base station switching method according to claim 8, wherein the determining whether the terminal moves in a direction away from the serving micro base station comprises:

10. A base station switching apparatus applied to a serving macro base station that controls a plurality of micro base stations, the base station switching apparatus comprising:

11. The base station switching apparatus according to claim 10, wherein the base station switching apparatus further comprises:

12. A base station switching apparatus applied to a serving micro base station, the serving micro base station being one of a plurality of micro base stations controlled by a serving macro base station, the base station switching apparatus comprising:

13. The base station switching apparatus according to claim 12, wherein,

The second receiving module is further configured to receive a first signal sent by the serving macro base station, where the first signal includes signals of multiple wavelengths after being combined, and the signals of multiple wavelengths are modulated by using different frequencies;

the base station switching device further includes:

14. A base station handoff system comprising:

15. The base station switching system of claim 14, wherein,

The service macro base station is also used for mapping a plurality of frequencies to the wavelengths used by a plurality of micro base stations controlled by the service macro base station, and modulating signals of the corresponding wavelengths by using the frequencies; combining the modulated signals with a plurality of wavelengths into a first signal, and transmitting the first signal to a plurality of micro base stations controlled by the micro base stations;

16. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the base station handover method according to any of claims 1-5 or the steps of the base station handover method according to any of claims 6-9.