CN109151938B - Method, device and equipment for multi-base station roaming switching - Google Patents
Method, device and equipment for multi-base station roaming switching Download PDFInfo
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- CN109151938B CN109151938B CN201811191351.XA CN201811191351A CN109151938B CN 109151938 B CN109151938 B CN 109151938B CN 201811191351 A CN201811191351 A CN 201811191351A CN 109151938 B CN109151938 B CN 109151938B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a method, a device, equipment and a computer readable storage medium for multi-base station roaming switching, wherein the method comprises the following steps: determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations; if the signal-to-noise ratio of the first base station is larger than the signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that the base station does not need to be switched; otherwise, determining that the second base station, the signal-to-noise ratio of which is greater than the signal-to-noise ratio threshold value and the distance between which and the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as the base station to which the terminal should be switched. The method and the device ensure higher efficiency of data transmission of the terminal, are simple in implementation mode, and further ensure higher implementation efficiency.
Description
Technical Field
The present invention relates to the field of wireless communication systems, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for roaming handover of multiple base stations.
Background
In the existing wireless communication system, in order to expand the coverage requirement of the broadband mobile multimedia communication system, a plurality of base stations are required to be erected. At this time, the terminal of the mobile station needs to perform automatic roaming handover between the multiple base stations.
An LTE system and a WCDMA system both disclose terminal roaming switching strategies under a public network system, and take the LTE system as an example, the method is that a terminal reports measurement results (including RSRP and RSRQ) based on received signals; the reporting is divided into periodic reporting and event-triggered reporting, the periodic reporting is configured by a base station, and a terminal directly reports a measurement result; the event triggering report is divided into events between systems with the same frequency and events between different systems, and the events comprise that a service cell is better than an absolute threshold and is worse than the absolute threshold, a neighbor cell is better than the service cell, the neighbor cell is better than the absolute threshold, the service cell is worse than the absolute threshold, and the neighbor cell is better than the absolute threshold. And then realize the switch of the base station on the basis of the result reported, this method of switching needs the terminal to realize the more complicated reporting mechanism, and then lead to the complicated switching mode, switch the inefficiency.
In summary, the technical solutions for implementing multi-base-station roaming handover in the prior art have the problems of complex handover mode and low handover efficiency.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a computer readable storage medium for multi-base station roaming handover, which can solve the problems of complex handover mode and low handover efficiency in the technical scheme for realizing multi-base station roaming handover in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for multi-base station roaming handover, comprising:
determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations;
if the signal-to-noise ratio of the first base station is larger than a signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that base station switching is not needed; otherwise, determining that the signal-to-noise ratio is greater than the signal-to-noise ratio threshold value and a second base station, of which the distance to the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as a base station to which the terminal should be switched.
Preferably, after determining that the signal-to-noise ratio of the first base station is not greater than a signal-to-noise ratio threshold, and/or that the distance between the first base station and the terminal is not less than the distance between any of the second base stations and the terminal, the method further includes:
and if a second base station which has the signal-to-noise ratio larger than the signal-to-noise ratio threshold value and the distance between the second base station and the terminal smaller than the distance between the first base station and the terminal does not exist, determining that the base station does not need to be switched.
Preferably, before determining whether the snr of the first base station is greater than the snr threshold, the method further includes:
correcting the signal-to-noise ratio of each base station according to the following formula:
wherein a and b are respectively preset forgetting factor and correction factor, i is the number of the second base station, SNR _ BS (t) at the left of equal sign represents the SNR at the current time of the first base station after correction, SNR _ BS (t) at the right of equal sign represents the SNR at the current time of the first base station before correction, SNR _ BS (t-1) represents the SNR at the last time of the first base station after correction, and SNR _ CUR _ BS at the left of equal sign represents the SNR at the current time of the first base station after correctioni(t)' represents the modified SNR of the second BS i at the current time, and the SNR _ CUR _ BS on the right of the equal signi(t) represents the signal-to-noise ratio, SNR _ CUR _ BS, of the second base station i at the current moment before correctioni(t-1) represents the signal-to-noise ratio at a time instant at the second base station i.
Preferably, the determining whether the snr of the first base station is greater than an snr threshold and the distance between the first base station and the terminal is smaller than the distance between any of the second base stations and the terminal includes:
calculating handover information R1(t) of the first base station according to the following formula:
R1(t)＝(SNR_BS(t)'-SNR_0-S)&&(MIN(D_CUR_BSi(t))-(D_BS(t)+D_0))；
wherein, SNR _0 represents a signal-to-noise ratio switching threshold, D _0 represents a distance switching threshold, S represents a signal-to-noise ratio protection value, D _ bs (t) represents a distance between a first base station and a terminal, and D _ CUR _ bsi (t) represents a distance between a second base station i and the terminal;
if R1(t) is greater than 0, then determining that the signal-to-noise ratio of the first base station is greater than a signal-to-noise ratio threshold and the distance between the first base station and the terminal is less than the distance between any of the second base stations and the terminal; if R1(t) is not greater than 0, then it is determined that the signal-to-noise ratio of the first base station is not greater than a signal-to-noise ratio threshold, and/or the distance between the first base station and the terminal is not less than the distance between any of the second base stations and the terminal.
Preferably, determining a second base station, as a candidate base station, where a signal-to-noise ratio is greater than the signal-to-noise ratio threshold and a distance between the second base station and the terminal is smaller than a distance between the first base station and the terminal, includes:
the handover information R1_ curi (t) of the second base station i is calculated according to the following formula:
R1_CURi(t)＝
(SNR_CUR_BSi(t)'-SNR_0-S)&&(D_BS(t)+D_0+D-D_CUR_BSi(t))；
wherein D _ CUR _ bsi (t) represents a distance between the second base station i and the terminal, and D represents a distance protection value;
determining the second base station with the R1_ CURI (t) being greater than 0 as a candidate base station with the signal-to-noise ratio being greater than the signal-to-noise ratio threshold and the distance to the terminal being less than the distance between the first base station and the terminal.
Preferably, selecting a second base station from the candidate base stations as a base station to which the terminal should be switched includes:
the signal strength information R2_ curi (t) of the second base station i is calculated according to the following formula:
R2_CURi(t)＝SNR_CUR_BSi(t)'-20log(D_CUR_BSi(t))；
and selecting the second base station with the largest R2_ CURI (t) in the candidate base stations as the base station to which the terminal is to be switched.
Preferably, the determining the signal-to-noise ratio of each base station includes:
and determining the signal-to-noise ratio of each base station by receiving the downlink broadcast channel of each base station.
An apparatus for multi-base station roaming handover, comprising:
a determination module to: determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations;
a decision module to: if the signal-to-noise ratio of the first base station is larger than a signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that base station switching is not needed; otherwise, determining that the signal-to-noise ratio is greater than the signal-to-noise ratio threshold value and a second base station, of which the distance to the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as a base station to which the terminal should be switched.
An apparatus for multi-base station roaming handover, comprising:
a memory for storing a computer program;
a processor configured to implement the steps of the method for multi-base station roaming handover as described in any one of the above when executing the computer program.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for multi-base station roaming handover as described in any one of the above.
The invention provides a method, a device, equipment and a computer readable storage medium for multi-base station roaming switching, wherein the method comprises the following steps: determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations; if the signal-to-noise ratio of the first base station is larger than a signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that base station switching is not needed; otherwise, determining that the signal-to-noise ratio is greater than the signal-to-noise ratio threshold value and a second base station, of which the distance to the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as a base station to which the terminal should be switched. In the technical scheme disclosed by the invention, if the signal-to-noise ratio of a first base station currently registered by the terminal is greater than the signal-to-noise ratio threshold value and the distance between the first base station and the terminal is less than the distance between any other base station and the terminal, the base station does not need to be switched, and if not, the base station with the signal-to-noise ratio greater than the signal-to-noise ratio threshold value and the distance between the base station and the terminal less than the distance between the first base station and the terminal is selected as the base station to which. The higher the signal-to-noise ratio is, the shorter the distance between the base station and the terminal is, the more beneficial the realization of data transmission of the terminal is, so that whether the base station needs to be switched is determined based on the signal-to-noise ratio and the distance between the base station and the terminal, so as to determine that the data transmission of the terminal is realized by the base station with higher signal-to-noise ratio among all the base stations and shorter distance between the base stations and the terminal, and ensure the higher efficiency of data transmission of the terminal; in addition, a terminal does not need to realize a complex reporting mechanism as in the prior art, but the switching of the base station can be realized through the signal-to-noise ratio of the base station and the distance between the base station and the terminal, the realization mode is simple, and the higher realization efficiency is further ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for multi-base station roaming handover according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for multi-base station roaming handover according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a method for multi-base station roaming handover according to an embodiment of the present invention is shown, where the method includes:
s11: and determining each base station in the wireless system, the signal-to-noise ratio of each base station and the distance between each base station and the terminal, and determining the base station currently registered by the terminal as a first base station, wherein all the base stations except the first base station are second base stations.
It should be noted that the subject of the method for performing roaming handover between multiple base stations according to the embodiment of the present invention may be a corresponding device for performing roaming handover between multiple base stations, and the device may be implemented by using a digital integrated circuit chip. In addition, the wireless system in the present invention is a wireless communication system in the background art, and may refer to a single-transmission single-reception OFDM system, or may refer to an OFDM system with multiple transmissions and multiple receptions but orthogonal pilot positions, or may refer to other wireless systems that need to be applied and to which the technical solution provided by the present invention can be applied, and is not limited herein.
The signal-to-noise ratio refers to the ratio of a signal to noise in an electronic device or electronic system, and in the present application, the signal-to-noise ratio refers to the ratio of a signal to noise in a base station; specifically, the base station (first base station) to which the terminal is currently registered may be denoted as N _ BS, and the remaining base stations (second base stations) may be denoted as CUR _ BSi, where i is the number of the second base station and N is the total number of the second base stations. The distance between each base station and the terminal may refer to an absolute distance between each base station and the terminal, and it is generally considered that the closer the distance between the base station and the terminal is, the better the effect of data transmission can be achieved.
S12: if the signal-to-noise ratio of the first base station is larger than the signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that the base station does not need to be switched; otherwise, determining that the second base station, the signal-to-noise ratio of which is greater than the signal-to-noise ratio threshold value and the distance between which and the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as the base station to which the terminal should be switched.
It should be noted that the snr threshold may be set according to actual needs, and since the higher the snr is, the less the corresponding signal contains noise, in the present application, if the snr of the first base station is greater than the snr threshold, the snr of the first base station is higher, which meets the requirement, otherwise, the snr of the first base station is considered too low, which does not meet the requirement. In addition, in the wireless system, the closer the distance between the base station and the terminal is, the more favorable the terminal is to use the base station to realize data transmission, so in the present application, if the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, it is stated that the first base station is the base station most favorable for the terminal to realize data transmission in terms of the distance from the terminal, otherwise, it is stated that the other base stations are more favorable for the terminal to realize data transmission in terms of the distance from the terminal than the first base station. In order to ensure that the terminal can realize data transmission in the best state, as long as the signal-to-noise ratio of the first base station and the distance between the first base station and the terminal are not in accordance with requirements, the better base station is selected as the base station registered by the terminal at the next moment, namely the second base station with the signal-to-noise ratio larger than the signal-to-noise ratio threshold value and the distance between the second base station and the terminal smaller than the distance between the second base station and the terminal is selected to realize the data transmission of the terminal.
In the technical scheme disclosed by the invention, if the signal-to-noise ratio of a first base station currently registered by the terminal is greater than the signal-to-noise ratio threshold value and the distance between the first base station and the terminal is less than the distance between any other base station and the terminal, the base station does not need to be switched, and if not, the base station with the signal-to-noise ratio greater than the signal-to-noise ratio threshold value and the distance between the base station and the terminal less than the distance between the first base station and the terminal is selected as the base station to which. The higher the signal-to-noise ratio is, the shorter the distance between the base station and the terminal is, the more beneficial the realization of data transmission of the terminal is, so that whether the base station needs to be switched is determined based on the signal-to-noise ratio and the distance between the base station and the terminal, so as to determine that the data transmission of the terminal is realized by the base station with higher signal-to-noise ratio among all the base stations and shorter distance between the base stations and the terminal, and ensure the higher efficiency of data transmission of the terminal; in addition, a terminal does not need to realize a complex reporting mechanism as in the prior art, but the switching of the base station can be realized through the signal-to-noise ratio of the base station and the distance between the base station and the terminal, the realization mode is simple, and the higher realization efficiency is further ensured.
The method for roaming handover of multiple base stations provided in the embodiment of the present invention may further include, after determining that the signal-to-noise ratio of the first base station is not greater than the signal-to-noise ratio threshold, and/or the distance between the first base station and the terminal is not less than the distance between any second base station and the terminal:
and if no second base station exists, the signal-to-noise ratio of which is greater than the signal-to-noise ratio threshold value and the distance between the second base station and the terminal is less than the distance between the first base station and the terminal, determining that the base station does not need to be switched.
It should be noted that, if there is no second base station whose snr is greater than the snr threshold and whose distance to the terminal is less than the distance between the first base station and the terminal, it is indicated that, in view of the two factors of snr and distance between terminals, there is no second base station that completely meets the data transmission requirement of the terminal, and it takes time and resources to implement the base station handover.
The method for roaming handover of multiple base stations provided in the embodiments of the present invention may further include, before determining whether the signal-to-noise ratio of the first base station is greater than the signal-to-noise ratio threshold:
correcting the signal-to-noise ratio of each base station according to the following formula:
wherein a and b are respectively preset forgetting factor and correction factor, i is the number of the second base station, SNR _ BS (t) at the left of equal sign represents the SNR at the current time of the first base station after correction, SNR _ BS (t) at the right of equal sign represents the SNR at the current time of the first base station before correction, SNR _ BS (t-1) represents the SNR at the last time of the first base station after correction, and SNR _ CUR _ BS at the left of equal sign represents the SNR at the current time of the first base station after correctioni(t)' represents the modified SNR of the second BS i at the current time, and the SNR _ CUR _ BS on the right of the equal signi(t) represents the signal-to-noise ratio, SNR _ CUR _ BS, of the second base station i at the current moment before correctioni(t-1) represents the signal-to-noise ratio at a time instant at the second base station i.
The specific values of a and b can be set according to actual needs, such as 1< a <8, and 1< b < 10. It should be noted that, for any base station, an abnormal situation may occur in which the signal-to-noise ratio changes greatly in an instant, and the abnormal situation may not reflect a real signal-to-noise ratio under a normal situation of the corresponding base station, and correspondingly, it is unreasonable to determine whether the signal-to-noise ratio of the corresponding base station meets a data transmission requirement of the terminal based on the abnormal situation, so that in the present application, the weighting calculation is implemented by the signal-to-noise ratio at the previous time and the signal-to-noise ratio at the current time through the above formula, so that even under the abnormal situation in which the signal-to-noise ratio changes greatly in an instant, the abnormality can be corrected by using the signal-to-noise ratio at the previous time, and it is further ensured that the signal-to-noise ratio used for implementing the determination of step S12 can reflect a real situation under a. And the actual measurement proves that the correction mode can achieve a better correction effect.
The method for roaming handover of multiple base stations, provided by the embodiment of the present invention, for determining whether a signal-to-noise ratio of a first base station is greater than a signal-to-noise ratio threshold, and whether a distance between the first base station and a terminal is smaller than a distance between any one second base station and the terminal, may include:
the handover information R1(t) of the first base station is calculated according to the following formula:
R1(t)＝(SNR_BS(t)'-SNR_0-S)&&(MIN(D_CUR_BSi(t))-(D_BS(t)+D_0))；
wherein, SNR _0 represents a signal-to-noise ratio switching threshold, D _0 represents a distance switching threshold, S represents a signal-to-noise ratio protection value, D _ bs (t) represents a distance between a first base station and a terminal, and D _ CUR _ bsi (t) represents a distance between a second base station i and the terminal;
if R1(t) is greater than 0, then it is determined that the signal-to-noise ratio of the first base station is greater than the signal-to-noise ratio threshold and the distance between the first base station and the terminal is less than the distance between any of the second base stations and the terminal; if R1(t) is not greater than 0, then it is determined that the signal-to-noise ratio of the first base station is not greater than the signal-to-noise ratio threshold and/or the distance between the first base station and the terminal is not less than the distance between any of the second base stations and the terminal.
It should be noted that MIN (D _ CUR _ bsi (t)) represents the minimum distance between the second base station and the terminal, and the signal-to-noise ratio threshold includes a signal-to-noise ratio switching threshold and a signal-to-noise ratio protection value, and in order to reduce the overhead of resource, time, and the like brought by switching base stations, in the present application, the distance between the first base station and the terminal and the distance between any other second base station and the terminal are compared, and a distance switching threshold is added to the distance between the first base station and the terminal, thereby increasing the requirement for determining the base station to be switched, and further reducing frequent switching between base stations.
The embodiment of the invention provides a method for multi-base station roaming switching, which determines a second base station as a candidate base station, wherein the signal-to-noise ratio of the second base station is greater than the signal-to-noise ratio threshold, and the distance between the second base station and a terminal is less than the distance between a first base station and the terminal, and the method comprises the following steps:
the handover information R1_ curi (t) of the second base station i is calculated according to the following formula:
R1_CURi(t)＝
(SNR_CUR_BSi(t)'-SNR_0-S)&&(D_BS(t)+D_0+D-D_CUR_BSi(t))；
wherein D _ CUR _ bsi (t) represents a distance between the second base station i and the terminal, and D represents a distance protection value;
and determining the second base station with the R1_ CURI (t) being greater than 0 as a candidate base station with the signal-to-noise ratio being greater than the signal-to-noise ratio threshold and the distance to the terminal being smaller than the distance between the first base station and the terminal.
The specific value of the distance protection value may be set according to actual needs, and is not specifically limited herein. It should be noted that when it is determined that the signal-to-noise ratio of the first base station is not greater than the signal-to-noise ratio threshold, and/or the distance between the first base station and the terminal is not less than the distance between any second base station and the terminal, that is, it is determined that the base station handover needs to be implemented, the candidate base station can be determined through the above formula. The reason why the distance between the second base station and the terminal is added with the distance switching threshold and the distance protection value and then compared with the distance between the first base station and the terminal is to reduce the requirement of selecting the base station to which the terminal needs to be switched when the switching is determined, so that the number of the selected second base stations is increased, and more second base stations with potential switching conditions are measured. .
The method for roaming handover of multiple base stations provided by the embodiment of the present invention selects a second base station from candidate base stations as a base station to which a terminal should be handed over, and may include:
the signal strength information R2_ curi (t) of the second base station i is calculated according to the following formula:
R2_CURi(t)＝SNR_CUR_BSi(t)'-20log(D_CUR_BSi(t))；
and selecting the second base station with the largest R2_ CURI (t) in the candidate base stations as the base station to which the terminal should be switched.
It should be noted that 20log (D _ CUR _ bsi (t)) represents a reduction influence of a distance between the second base station i and the terminal on a signal corresponding to the second base station i, and when the signal-to-noise ratio of the second base station i and the distance between the second base station i and the terminal are taken into consideration comprehensively by subtracting the reduction influence from the signal-to-noise ratio of the second base station i, the signal strength that the second base station i can realize is higher, which is more favorable for realizing data transmission, so that the second base station with the largest signal strength is selected as the base station to which the terminal should be switched, and the high efficiency and high effectiveness of the terminal in realizing data transmission are further ensured.
The method for roaming switching of multiple base stations provided by the embodiment of the invention determines the signal-to-noise ratio of each base station, and can comprise the following steps:
and determining the signal-to-noise ratio of each base station by receiving the downlink broadcast channel of each base station.
It should be noted that the signal-to-noise ratio of each base station may be determined by a worker and input to the multi-base-station roaming switching device, or may be determined by receiving the downlink broadcast channel of each base station, so that manual participation is not required, and labor cost and time consumption are reduced. The implementation principle of the technical scheme for calculating the signal-to-noise ratio of the corresponding base station by receiving the downlink broadcast channel is consistent with the implementation principle of the corresponding technical scheme in the prior art, and further description is omitted here.
In this embodiment, the technical solution disclosed in the present invention is specifically described by taking an example that both the base station and the terminal perform communication by using the OFDM technology, and the number of the base stations is set to be 4.
(1) Setting a current registered base station of a terminal in a wireless system as N _ BS, and setting other base stations as CUR _ BSi, wherein i is 1,2.. N;
(2) by receiving downlink broadcast channels of all base stations, calculating the signal-to-noise ratio SNR _ BS (t) of the current registered base station (first base station), the distance D _ BS (t) between the current registered base station and the terminal, and the signal-to-noise ratio SNR _ CUR _ BS of the rest base stations (second base stations)i(t), the distance D _ Cur _ BSi (t) between the other base stations and the terminal;
(3) the signal-to-noise ratio of each base station is corrected according to the following formula:
wherein, a takes the value of 5, and b takes the value of 3.
(4) Setting SNR _0 as 5, S as 1, D as 0.5, and calculating the corresponding information according to the following formula:
R1(t)＝(SNR_BS(t)'-SNR_0-S)&&(MIN(D_CUR_BSi(t))-(D_BS(t)+D_0))；
R1_CURi(t)＝
(SNR_CUR_BSi(t)'-SNR_0-S)&&(D_BS(t)+D_0+D-D_CUR_BSi(t))；
R2_CURi(t)＝SNR_CUR_BSi(t)'-20log(D_CUR_BSi(t))。
(5) judging a switching base station:
if R1(t) is larger than 0, the original base station is kept and no switching is carried out;
if R1(t) is not more than 0, calculating all other base stations with R1_ CURI (t) >0 as candidate base stations, and selecting the largest R2_ CURI (t) from all the candidate base stations with R1_ CURI (t) >0 as a new registered base station for switching; if all other base stations do not conform to R1_ CURI (t) >0, the original base station is still maintained, and no switching is performed;
through practical tests, the technical scheme provided by the invention greatly reduces the calculation complexity and ensures the switching sensitivity.
An embodiment of the present invention further provides a device for multi-base station roaming handover, as shown in fig. 2, the device may include:
a determining module 11, configured to: determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations;
a first decision module 12 for: if the signal-to-noise ratio of the first base station is larger than the signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that the base station does not need to be switched; otherwise, determining that the second base station, the signal-to-noise ratio of which is greater than the signal-to-noise ratio threshold value and the distance between which and the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as the base station to which the terminal should be switched.
The apparatus for multi-base station roaming handover provided by the embodiment of the present invention may further include:
a second decision module configured to: and after the signal-to-noise ratio of the first base station is determined to be not larger than the signal-to-noise ratio threshold value and/or the distance between the first base station and the terminal is determined to be not smaller than the distance between any second base station and the terminal, if no second base station exists, the signal-to-noise ratio of which is larger than the signal-to-noise ratio threshold value and the distance between the second base station and the terminal is smaller than the distance between the first base station and the terminal, determining that the base station does not need.
The apparatus for multi-base station roaming handover provided by the embodiment of the present invention may further include:
a correction module to: before judging whether the signal-to-noise ratio of the first base station is larger than the signal-to-noise ratio threshold value, correcting the signal-to-noise ratio of each base station according to the following formula:
wherein a and b are respectively preset forgetting factor and correction factor, i is the number of the second base station, SNR _ BS (t) at the left of equal sign represents the SNR at the current time of the first base station after correction, SNR _ BS (t) at the right of equal sign represents the SNR at the current time of the first base station before correction, SNR _ BS (t-1) represents the SNR at the last time of the first base station after correction, and SNR _ CUR _ BS at the left of equal sign represents the SNR at the current time of the first base station after correctioni(t)' represents the modified SNR of the second BS i at the current time, and the SNR _ CUR _ BS on the right of the equal signi(t) represents the signal-to-noise ratio, SNR _ CUR _ BS, of the second base station i at the current moment before correctioni(t-1) represents the signal-to-noise ratio at a time instant at the second base station i.
In an embodiment of the present invention, a first determining module of a device for multi-base station roaming handover may include: a first decision unit for: the handover information R1(t) of the first base station is calculated according to the following formula:
R1(t)＝(SNR_BS(t)'-SNR_0-S)&&(MIN(D_CUR_BSi(t))-(D_BS(t)+D_0))；
wherein, SNR _0 represents a signal-to-noise ratio switching threshold, D _0 represents a distance switching threshold, S represents a signal-to-noise ratio protection value, D _ bs (t) represents a distance between a first base station and a terminal, and D _ CUR _ bsi (t) represents a distance between a second base station i and the terminal; and if R1(t) is greater than 0, determining that the signal-to-noise ratio of the first base station is greater than the signal-to-noise ratio threshold and the distance between the first base station and the terminal is less than the distance between any of the second base stations and the terminal; if R1(t) is not greater than 0, then it is determined that the signal-to-noise ratio of the first base station is not greater than the signal-to-noise ratio threshold and/or the distance between the first base station and the terminal is not less than the distance between any of the second base stations and the terminal.
In an embodiment of the present invention, a first determining module of a device for multi-base station roaming handover may include:
a second decision unit configured to: the handover information R1_ curi (t) of the second base station i is calculated according to the following formula:
R1_CURi(t)＝
(SNR_CUR_BSi(t)'-SNR_0-S)&&(D_BS(t)+D_0+D-D_CUR_BSi(t))；
wherein D _ CUR _ bsi (t) represents a distance between the second base station i and the terminal, and D represents a distance protection value; and determining that the second base station with the R1_ CURI (t) being greater than 0 is a candidate base station with the signal-to-noise ratio being greater than the signal-to-noise ratio threshold and the distance to the terminal being less than the distance between the first base station and the terminal.
In an embodiment of the present invention, a first determining module of a device for multi-base station roaming handover may include:
a selecting unit for: the signal strength information R2_ curi (t) of the second base station i is calculated according to the following formula:
R2_CURi(t)＝SNR_CUR_BSi(t)' -20log (D _ CUR _ BSi (t)); and selecting the second base station with the largest R2_ CURI (t) in the candidate base stations as the base station to which the terminal should be switched.
In an apparatus for multi-base station roaming handover provided in an embodiment of the present invention, a determining module may include:
a determination unit configured to: and determining the signal-to-noise ratio of each base station by receiving the downlink broadcast channel of each base station.
The embodiment of the invention also provides a device for multi-base station roaming switching, which can comprise:
a memory for storing a computer program;
a processor configured to implement the steps of the method for multi-base station roaming handover as described above when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for performing roaming handover between multiple base stations are implemented as described above.
It should be noted that for the description of the related parts in the apparatus, the device, and the computer-readable storage medium for multi-base station roaming handover provided in the embodiments of the present invention, reference is made to the detailed description of the corresponding parts in the method for multi-base station roaming handover provided in the embodiments of the present invention, and details are not repeated herein. In addition, parts of the technical solutions provided in the embodiments of the present invention that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for multi-base station roaming handover, comprising:
determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations;
if the signal-to-noise ratio of the first base station is larger than a signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that base station switching is not needed; otherwise, determining that the signal-to-noise ratio is greater than the signal-to-noise ratio threshold value and a second base station, of which the distance to the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as a base station to which the terminal should be switched;
after determining that the signal-to-noise ratio of the first base station is not greater than a signal-to-noise ratio threshold and/or that the distance between the first base station and the terminal is not less than the distance between any of the second base stations and the terminal, the method further includes:
if a second base station which has a signal-to-noise ratio larger than the signal-to-noise ratio threshold value and has a distance with the terminal smaller than the distance between the first base station and the terminal does not exist, determining that the base station does not need to be switched;
before judging whether the signal-to-noise ratio of the first base station is greater than a signal-to-noise ratio threshold, the method further includes:
correcting the signal-to-noise ratio of each base station according to the following formula:
wherein a and b are respectively preset forgetting factor and correction factor, i is the number of the second base station, SNR _ BS (t) at the left of equal sign represents the SNR at the current time of the first base station after correction, SNR _ BS (t) at the right of equal sign represents the SNR at the current time of the first base station before correction, SNR _ BS (t-1) represents the SNR at the last time of the first base station after correction, and SNR _ CUR _ BS at the left of equal sign represents the SNR at the current time of the first base station after correctioni(t)' indicates that the second base station i is currently present after the correctionSignal-to-noise ratio at time, SNR _ CUR _ BS to the right of equal signi(t) represents the signal-to-noise ratio, SNR _ CUR _ BS, of the second base station i at the current moment before correctioni(t-1) represents the signal-to-noise ratio at a time instant at the second base station i.
2. The method of claim 1, wherein determining whether the snr of the first base station is greater than an snr threshold and whether the distance between the first base station and the terminal is less than the distance between any of the second base stations and the terminal comprises:
calculating handover information R1(t) of the first base station according to the following formula:
R1(t)＝(SNR_BS(t)'-SNR_0-S)&&(MIN(D_CUR_BSi(t))-(D_BS(t)+D_0))；
wherein, SNR _0 represents a signal-to-noise ratio switching threshold, D _0 represents a distance switching threshold, S represents a signal-to-noise ratio protection value, D _ bs (t) represents a distance between a first base station and a terminal, and D _ CUR _ bsi (t) represents a distance between a second base station i and the terminal;
if R1(t) is greater than 0, then determining that the signal-to-noise ratio of the first base station is greater than a signal-to-noise ratio threshold and the distance between the first base station and the terminal is less than the distance between any of the second base stations and the terminal; if R1(t) is not greater than 0, then it is determined that the signal-to-noise ratio of the first base station is not greater than a signal-to-noise ratio threshold, and/or the distance between the first base station and the terminal is not less than the distance between any of the second base stations and the terminal.
3. The method of claim 2, wherein determining that the second base station having a signal-to-noise ratio greater than the signal-to-noise ratio threshold and a distance to the terminal less than the distance between the first base station and the terminal is a candidate base station comprises:
the handover information R1_ curi (t) of the second base station i is calculated according to the following formula:
R1_CURi(t)＝(SNR_CUR_BSi(t)'-SNR_0-S)&&(D_BS(t)+D_0+D-D_CUR_BSi(t))；
wherein D _ CUR _ bsi (t) represents a distance between the second base station i and the terminal, and D represents a distance protection value;
determining the second base station with the R1_ CURI (t) being greater than 0 as a candidate base station with the signal-to-noise ratio being greater than the signal-to-noise ratio threshold and the distance to the terminal being less than the distance between the first base station and the terminal.
4. The method of claim 3, wherein selecting a second base station from the candidate base stations as a base station to which the terminal should be handed over comprises:
the signal strength information R2_ curi (t) of the second base station i is calculated according to the following formula:
R2_CURi(t)＝SNR_CUR_BSi(t)'-20log(D_CUR_BSi(t))；
and selecting the second base station with the largest R2_ CURI (t) in the candidate base stations as the base station to which the terminal is to be switched.
5. The method of claim 4, wherein determining the signal-to-noise ratio for each base station comprises:
and determining the signal-to-noise ratio of each base station by receiving the downlink broadcast channel of each base station.
6. An apparatus for multi-base station roaming handover, comprising:
a determination module to: determining each base station in a wireless system, the signal-to-noise ratio of each base station and the distance between each base station and a terminal, and determining that the base station currently registered by the terminal is a first base station, and all base stations except the first base station are second base stations;
a decision module to: if the signal-to-noise ratio of the first base station is larger than a signal-to-noise ratio threshold value, and the distance between the first base station and the terminal is smaller than the distance between any second base station and the terminal, determining that base station switching is not needed; otherwise, determining that the signal-to-noise ratio is greater than the signal-to-noise ratio threshold value and a second base station, of which the distance to the terminal is less than the distance between the first base station and the terminal, is a candidate base station, and selecting one second base station from the candidate base stations as a base station to which the terminal should be switched;
the device further comprises:
a second decision module configured to: after determining that the signal-to-noise ratio of the first base station is not greater than a signal-to-noise ratio threshold value and/or the distance between the first base station and the terminal is not less than the distance between any second base station and the terminal, if no second base station exists, the signal-to-noise ratio of which is greater than the signal-to-noise ratio threshold value and the distance between the second base station and the terminal is less than the distance between the first base station and the terminal, determining that base station handover is not required;
a correction module to: before judging whether the signal-to-noise ratio of the first base station is larger than a signal-to-noise ratio threshold value, correcting the signal-to-noise ratio of each base station according to the following formula:
wherein a and b are respectively preset forgetting factor and correction factor, i is the number of the second base station, SNR _ BS (t) at the left of equal sign represents the SNR at the current time of the first base station after correction, SNR _ BS (t) at the right of equal sign represents the SNR at the current time of the first base station before correction, SNR _ BS (t-1) represents the SNR at the last time of the first base station after correction, and SNR _ CUR _ BS at the left of equal sign represents the SNR at the current time of the first base station after correctioni(t)' represents the modified SNR of the second BS i at the current time, and the SNR _ CUR _ BS on the right of the equal signi(t) before correctionSignal-to-noise ratio, SNR _ CUR _ BS, of the second base station i at the current timei(t-1) represents the signal-to-noise ratio at a time instant at the second base station i.
7. An apparatus for multi-base station roaming handover, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for multi-base station roaming handover as claimed in any one of claims 1 to 5 when executing the computer program.
8. A computer-readable storage medium, having a computer program stored thereon, which, when executed by a processor, performs the steps of the method for multi-base station roaming handover as claimed in any one of claims 1 to 5.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2601372B (en) | 2020-11-30 | 2022-12-14 | British Telecomm | Wireless telecommunications network |
| CN115190554B (en) | 2022-07-08 | 2023-07-14 | 未岚大陆(北京)科技有限公司 | Base station switching method of mower, mower and multi-base station working system |
| CN115767653B (en) * | 2022-10-25 | 2024-03-22 | 上海幄萨信息技术有限公司 | Unmanned aerial vehicle control method based on multi-base station communication mode |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8054802B2 (en) * | 2007-10-29 | 2011-11-08 | Alcatel Lucent | Hand-off trigger at access technology borders |
| CN101557628B (en) * | 2008-04-11 | 2011-04-20 | 大唐移动通信设备有限公司 | Measurement starting method of cell reselection and mobile terminal thereof |
| US20100113035A1 (en) * | 2008-11-05 | 2010-05-06 | Suat Eskicioglu | Location-based handovers from a macrocell to a femtocell using event-triggered measurement reporting |
| US8442538B2 (en) * | 2009-12-29 | 2013-05-14 | Trueposition, Inc. | Cooperating receiver selection for UMTS wireless location |
| CN102158920A (en) * | 2011-05-13 | 2011-08-17 | 新邮通信设备有限公司 | Selecting method of target base station during switching of base station and base station |
| CN102724725A (en) * | 2012-06-27 | 2012-10-10 | 中国科学技术大学 | Load transfer method for home evolved node base station network |
-
2018
- 2018-10-12 CN CN201811191351.XA patent/CN109151938B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 一种散射通信信噪比估计算法的仿真与实现;孙柏昶，卢坡;《计算机与网络》;20120630;全文 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023016714A1 (en) * | 2021-08-10 | 2023-02-16 | British Telecommunications Public Limited Company | Wireless telecommunications network |
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