CN107567053B - Data transmission method, equipment and system - Google Patents

Data transmission method, equipment and system Download PDF

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Publication number
CN107567053B
CN107567053B CN201610514737.4A CN201610514737A CN107567053B CN 107567053 B CN107567053 B CN 107567053B CN 201610514737 A CN201610514737 A CN 201610514737A CN 107567053 B CN107567053 B CN 107567053B
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base station
terminal
serviceable
data
ith
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CN107567053A (en
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庄宏成
张洁涛
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off

Abstract

The invention relates to the technical field of wireless communication, in particular to a method, equipment and a system for data transmission, which are used for solving the problem of low efficiency of data transmission based on an ultra-dense network. The method comprises the following steps: the controller determines a scheduling policy of at least one serviceable base station for servicing the jth terminal and a cache policy of at least one candidate base station after determining that the jth terminal of the N terminals serviced by the M base stations needs to acquire data, and respectively sends the scheduling policy to the at least one serviceable base station and the cache policy to the at least one candidate base station. According to the technical scheme, the controller can determine the scheduling strategy of the serviceable base station for serving the terminal and the cache strategy of the candidate base station for serving the terminal aiming at the terminal needing to acquire data, so that the loss of the data acquired by the terminal in the process of switching the base stations is avoided, and the data transmission efficiency is improved.

Description

Data transmission method, equipment and system
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method, a device, and a system for data transmission.
Background
UDN (Ultra Dense Network) is a powerful candidate technology of 5G, and by increasing the deployment density of base stations, the frequency reuse efficiency is greatly improved, and the system capacity is greatly improved.
However, intensive base station deployment in the network causes high dynamic change of the base station serving the terminal when the terminal moves dynamically, which easily causes loss of data in the transmission process or repeated transmission of a large amount of data, and causes great waste of spectrum resources and the like.
In summary, the efficiency of data transmission based on the ultra-dense network in the prior art is low.
Disclosure of Invention
The invention provides a data transmission method, equipment and a system, which are used for solving the problem of low data transmission efficiency based on an ultra-dense network in the prior art.
In a first aspect, a method for data transmission is provided, including:
the controller determines a scheduling policy of at least one serviceable base station for servicing the jth terminal and a cache policy of at least one candidate base station after determining that the jth terminal of the N terminals serviced by the M base stations needs to acquire data, and respectively sends the scheduling policy to the at least one serviceable base station and the cache policy to the at least one candidate base station. The scheduling policy of the ith serviceable base station in the at least one serviceable base station is used for indicating parameter information of data sent by the ith serviceable base station to the jth terminal, and the caching policy of the kth candidate base station in the at least one candidate base station is used for indicating data cached by the kth candidate base station.
The controller can determine a scheduling strategy of a serviceable base station for serving a terminal and a cache strategy of a candidate base station for serving the terminal aiming at the terminal needing to acquire data, so that the loss of the data acquired by the terminal in the process of switching base stations is avoided.
On the basis of the first aspect, optionally, the scheduling policy of the ith serviceable base station includes a rate at which the ith serviceable base station transmits data to the jth terminal, where the rate at which the ith serviceable base station transmits data to the jth terminal satisfies the following expression:
Figure BDA0001037498170000021
wherein r isi,jRate of data transmission r for ith serviceable base station to jth terminalj minMinimum data transmission rate required for the jth terminal; rhoiThe load of the ith serviceable base station; rhoaThe load of the a-th serviceable base station; s is the set of serviceable base stations.
On the basis of the first aspect, optionally, the scheduling policy of the ith serviceable base station includes a rate at which the ith serviceable base station transmits data to the jth terminal, and the controller determines the set of serviceable base stations and the rate at which the ith serviceable base station transmits data to the jth terminal according to the following expressions:
Figure BDA0001037498170000022
Figure BDA0001037498170000023
Figure BDA0001037498170000024
Figure BDA0001037498170000025
Figure BDA0001037498170000026
where M is a set of potentially serviceable base stations serving the jth terminal, i is the ith base station in the set M, Δ t is the size of each slot, eiFor the static energy consumption of the ith base station per time slot, fi(ρi) For the dynamic energy consumption of the ith base station per time slot,
Figure BDA0001037498170000031
to predict the rate at which the ith base station will transmit data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000032
to the rate at which the ith base station actually transmits data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000033
the buffer size for the jth terminal at the tth slot,
Figure BDA0001037498170000034
buffer area for jth terminal in t-1 time slotSize of (A), KiIs the total number of resource blocks of the ith base station,
Figure BDA0001037498170000035
for the load of the ith base station in the t-th time slot,
Figure BDA0001037498170000036
minimum data transmission rate required for the jth terminal, N being the set of terminals, MjIs the set serving the jth terminal.
On the basis of the first aspect, optionally, if it is determined that the candidate base station for serving the jth terminal cannot provide service for the jth terminal after the jth terminal is moved out of the serviceable base station, the controller determines a first duration and a second duration, and updates the rate at which the ith serviceable base station transmits data to the jth terminal according to the first duration and the second duration; determining a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the jth terminal; and sending the updated data transmission rate of the ith serviceable base station to the jth terminal and sending a new cache strategy to at least one candidate base station to the ith serviceable base station, wherein the first time length is the time length required by the jth terminal to pass through the ith serviceable base station, and the second time length is the time length required by the jth terminal to pass through the candidate base station incapable of providing service for the jth terminal.
Because the candidate base station can provide service for the terminal after the terminal moves out of the base station or not, in order to reduce the probability that the candidate base station cannot provide service for the terminal after the terminal moves out of the base station, whether the candidate base station can provide service for the terminal after the terminal moves out of the base station or not is judged again, if the candidate base station cannot provide service for the terminal, the speed and the cache strategy of the data transmission from the serviceable base station to the jth terminal are updated, and the interruption of data transmission caused by the fact that the candidate base station cannot provide service for the terminal is reduced.
On the basis of the first aspect, optionally, the updated data transmission rate of the ith serviceable base station to the jth terminal satisfies the following expression:
r′i,j＝(αj+βj)ri,j*(Ti+Tk)/Ti；
wherein r'i,jFor the updated i-th serving base station to transmit data to the j-th terminal, ri,jFor the ith serving base station transmitting data to the jth terminal, αjAs a predictive compensation factor for the jth terminal, αj＞1，βjAs a backhaul compensation factor for the j terminal, βj＞0，TiDuration T for jth terminal to pass ith serviceable base stationkThe duration for the jth terminal to pass the kth candidate base station.
On the basis of the first aspect, optionally, if it is determined that the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited after the jth terminal moves out of the serviceable base station, the controller updates a rate at which the ith serviceable base station transmits data to the jth terminal in the following manner;
r′i,j＝(1+βj)ri,j，
wherein r'i,jFor the updated i-th serving base station to transmit data to the j-th terminal, ri,jFor the ith serving base station transmitting data to the jth terminal, βjAs a backhaul compensation factor for the j terminal, βj＞0；
The controller determines a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the terminal; and sending the updated data transmission rate of the ith serviceable base station to the jth terminal and sending a new buffering strategy to at least one candidate base station to the ith serviceable base station.
After determining that the jth terminal is moved out of the serviceable base station, the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited, and by updating the rate of transmitting data to the terminal by the ith serviceable base station and the cache policy of the candidate base station, the efficiency of data transmission is improved.
On the basis of the first aspect, optionally, the controller determines that the jth terminal acquires transmission capability information of the candidate base station before moving out of the serviceable base station; and judging whether the candidate base station can provide service for the jth terminal according to the transmission capability information of the candidate base station, and judging whether a backhaul link of the candidate base station is limited.
On the basis of the first aspect, optionally, the caching policy includes a starting position of the candidate base station caching data, and the controller determines the starting position of the candidate base station caching data according to the following manner:
Figure BDA0001037498170000041
wherein D isjCaching the starting position of data for the jth terminal candidate base station, Tj' average duration of serving jth terminal for ith serviceable base station, S is set of serviceable base stations, rh,jThe rate at which data is transmitted to the jth terminal for the h serviceable base station.
On the basis of the first aspect, optionally, before determining that the jth terminal needs to acquire data, the controller receives at least one pilot signal strength sent by the jth terminal, where each pilot signal strength is used to indicate that the jth terminal receives the strength of a pilot signal sent by the base station; selecting a base station with the load lower than a second preset threshold value from the base stations with the pilot signal strength higher than the first preset threshold value; then, the selected base station is used as a serviceable base station.
On the basis of the first aspect, optionally, before determining that the jth terminal needs to acquire data, the controller determines, according to the movement information of the jth terminal, a candidate base station serving the jth terminal, where a load of the candidate base station is lower than a third preset threshold.
In a second aspect, a method for data transmission is provided, including:
the base station receives a scheduling strategy sent by the controller, wherein the scheduling strategy is used for indicating the base station to send the indication information of the data to the terminal; and sending data to the terminal according to the scheduling policy.
On the basis of the second aspect, optionally, the scheduling policy includes a rate of transmitting data to the terminal by the base station, and the rate of transmitting data to the terminal by the base station satisfies the following expression:
Figure BDA0001037498170000051
wherein r is the rate of data transmission from the base station to the terminal, rminMinimum data transmission rate required for the terminal; rho is the load of the base station;
Figure BDA0001037498170000052
the load of all base stations serving the terminal; s is the set of all base stations serving the terminal.
On the basis of the second aspect, optionally, the scheduling policy includes a rate of data transmitted by the base station to the terminal, and the rate of data transmitted by the base station to the terminal satisfies the following expression:
Figure BDA0001037498170000061
Figure BDA0001037498170000062
Figure BDA0001037498170000063
Figure BDA0001037498170000064
0≤d(t)
wherein M is a set of potential base stations serving the terminal in the control range of the controller, i is the ith base station in the set M, delta t is the size of each time slot, eiFor the static energy consumption of the ith base station per time slot, fi(ρi) For the dynamic energy consumption of the ith base station per time slot,
Figure BDA0001037498170000065
to predict the rate at which the ith base station will transmit data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000066
for the rate at which the ith base station actually transmits data to the jth terminal in the tth slot on one resource block, d(t)Size of buffer for terminal at t time slot, d(t-1)The size of a buffer area, K, of the terminal in the t-1 th time slotiIs the total number of resource blocks of the ith base station,
Figure BDA0001037498170000067
for the load of the ith base station in the t time slot, rminMinimum data transmission rate required for a terminal, N is the set of terminals served by base stations within the control authority, MjServing a set of terminals.
On the basis of the second aspect, optionally, the base station receives the updated data transmission rate to the terminal sent by the controller; and sending the data to the terminal according to the updated data transmission rate to the terminal.
In a third aspect, a method for data transmission is provided, including:
the base station receives a caching strategy sent by the controller, wherein the caching strategy is used for indicating the base station to cache data needing to be sent to the terminal; caching data according to a caching strategy; and after determining to serve the terminal, transmitting the cached data to the terminal.
On the basis of the third aspect, optionally, the caching policy includes a starting position of the candidate base station caching data, and the controller determines the starting position of the candidate base station caching data according to the following manner:
Figure BDA0001037498170000068
wherein D is the initial position of the data buffered by the terminal base station, and T' is the position of the terminal served by the serving base stationAverage duration, S is the set of serviceable base stations, rhFor the h-th serviceable base station's rate of data transmission to the terminal, the serviceable base station serves the base station that served the terminal before the terminal.
On the basis of the third aspect, optionally, before the base station receives the caching policy sent by the controller, the base station sends transmission capability information to the controller, so that the base station controls to determine whether to update the caching policy.
In a fourth aspect, a method for data transmission is provided, including:
the terminal determines data needing to be acquired; notifying the controller that data needs to be acquired; receiving data sent by a serviceable base station, and receiving data sent by candidate base stations after the serviceable base station is moved out; the base station capable of being served transmits data to the terminal through a scheduling strategy determined by the controller, wherein the scheduling strategy is used for indicating the base station capable of being served to transmit the indication information of the data to the terminal; the candidate base station caches the data sent to the terminal according to a caching strategy sent by the controller, and the caching strategy is used for indicating the data cached by the candidate base station.
On the basis of the fourth aspect, optionally, before the terminal determines that data acquisition is required, the measured pilot signal strength of at least one base station is sent to the controller.
In a fifth aspect, there is provided a device for data transmission, comprising a processing unit and a transceiving unit, wherein, the processing unit is configured to, after determining that a jth terminal of the N terminals served by the M base stations needs to acquire data, determining a scheduling policy of at least one serviceable base station for serving a jth terminal and a caching policy of at least one candidate base station, wherein the at least one serviceable base station is a base station currently serving the jth terminal, the at least one candidate base station is a base station serving the jth terminal after the jth terminal moves out of the serviceable base station, the scheduling policy of an ith serviceable base station in the at least one serviceable base station is used for indicating parameter information of data sent by the ith serviceable base station to the jth terminal, and the caching policy of a kth candidate base station in the at least one candidate base station is used for indicating data cached by the kth candidate base station; the transceiver unit is configured to transmit the scheduling policy to at least one serviceable base station and the buffering policy to at least one candidate base station, respectively.
On the basis of the fifth aspect, optionally, the scheduling policy of the ith serviceable base station includes a rate at which the ith serviceable base station transmits data to the jth terminal, where the rate at which the ith serviceable base station transmits data to the jth terminal satisfies the following expression:
Figure BDA0001037498170000071
wherein r isi,jRate of data transmission r for ith serviceable base station to jth terminalj minMinimum data transmission rate required for the jth terminal; rhoiThe load of the ith serviceable base station; rhoaThe load of the a-th serviceable base station; s is the set of serviceable base stations.
On the basis of the fifth aspect, optionally, the scheduling policy of the ith serviceable base station includes a rate at which the ith serviceable base station transmits data to the jth terminal, and the processing unit determines the set of serviceable base stations and the rate at which the ith serviceable base station transmits data to the jth terminal according to the following expressions:
Figure BDA0001037498170000081
Figure BDA0001037498170000082
Figure BDA0001037498170000083
Figure BDA0001037498170000084
Figure BDA0001037498170000085
where M is a set of potentially serviceable base stations serving the jth terminal, i is the ith base station in the set M, Δ t is the size of each slot, eiFor the static energy consumption of the ith base station per time slot, fi(ρi) For the dynamic energy consumption of the ith base station per time slot,
Figure BDA0001037498170000086
to predict the rate at which the ith base station will transmit data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000087
to the rate at which the ith base station actually transmits data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000088
the buffer size for the jth terminal at the tth slot,
Figure BDA0001037498170000089
the size of the buffer for the jth terminal in the t-1 th time slot, KiIs the total number of resource blocks of the ith base station,
Figure BDA00010374981700000810
for the load of the ith base station in the t-th time slot,
Figure BDA00010374981700000811
minimum data transmission rate required for the jth terminal, N being the set of terminals, MjIs the set serving the jth terminal.
On the basis of the fifth aspect, optionally, the processing unit is further configured to determine a first time duration and a second time duration if it is determined that the candidate base station for serving the jth terminal cannot provide a service for the jth terminal after the jth terminal is moved out of the serviceable base station, where the first time duration is a time duration required by the jth terminal to pass through the ith serviceable base station, and the second time duration is a time duration required by the jth terminal to pass through the candidate base station that cannot provide a service for the jth terminal; updating the data transmission rate of the ith serving base station to the jth terminal according to the first time length and the second time length; determining a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the jth terminal;
the transceiver unit is further configured to send the updated data transmission rate of the ith serviceable base station to the jth terminal to the ith serviceable base station, and send a new buffering policy to at least one candidate base station.
On the basis of the fifth aspect, optionally, the processing unit is further configured to update a rate at which the ith serviceable base station transmits data to the jth terminal according to the following manner if it is determined that, after the jth terminal moves out of the serviceable base station, the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited;
r′i,j＝(1+βj)ri,j，
wherein r'i,jFor the updated i-th serving base station to transmit data to the j-th terminal, ri,jFor the ith serving base station transmitting data to the jth terminal, βjAs a backhaul compensation factor for the j terminal, βj＞0；
Determining a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serviceable base station to the terminal;
the transceiver unit is further configured to send the updated data transmission rate of the ith serviceable base station to the jth terminal to the ith serviceable base station, and send a new buffering policy to at least one candidate base station.
On the basis of the fifth aspect, optionally, the caching policy includes a starting position of the candidate base station caching data, and the processing unit determines the starting position of the candidate base station caching data according to the following manner:
Figure BDA0001037498170000091
wherein D isjCaching data for a candidate base station for a jth terminalStarting position of, Tj' average duration of serving jth terminal for ith serviceable base station, S is set of serviceable base stations, rh,jThe rate at which data is transmitted to the jth terminal for the h serviceable base station.
On the basis of the fifth aspect, optionally, the transceiver unit is further configured to receive at least one pilot signal strength sent by the jth terminal before the processing unit determines that the jth terminal needs to acquire data, where each pilot signal strength is used to indicate that the jth terminal receives the strength of the pilot signal sent by the base station;
the processing unit is further configured to select a base station with a load lower than a second preset threshold from the base stations with the pilot signal strength greater than the first preset threshold; and the selected base station is taken as a serviceable base station.
The sixth aspect provides a data transmission terminal, which includes a processing unit and a transceiver unit, wherein the processing unit is configured to determine that data needs to be acquired; the receiving and transmitting unit is used for informing the controller of the need of acquiring data; receiving data sent by a serviceable base station, wherein the serviceable base station sends the data to the terminal through a scheduling policy determined by the controller, and the scheduling policy is used for indicating information indicating that the serviceable base station sends the data to the terminal; and after the terminal moves out of the serviceable base station, receiving data sent by the candidate base station, wherein the candidate base station caches the data sent to the terminal according to a caching strategy sent by the controller, and the caching strategy is used for indicating the data cached by the candidate base station.
On the basis of the sixth aspect, optionally, the transceiver unit is further configured to send the measured pilot signal strength of the at least one base station to the controller before the processing unit determines that data acquisition is required.
In a seventh aspect, a controller for data transmission is provided, including: a processor, a transceiver, and a memory; the memory is used for storing data to be transmitted and a program of the technical scheme of the data transmission designed by the processor in the first aspect; the transceiver is used for receiving and sending data to be transmitted; the processor is configured to execute the program of any of the data transmission aspects of the first aspect.
In an eighth aspect, a terminal for data transmission is provided, which includes: a processor, a transceiver, and a memory; the memory is used for storing data to be transmitted and the processor executes the program of the technical scheme of data transmission designed in the fourth aspect; the transceiver is used for receiving and sending data to be transmitted; the processor is configured to execute the program of any of the embodiments of the fourth aspect for data transmission.
A ninth aspect of the present invention provides a system for data transmission, including any controller, any terminal, at least one serviceable base station, and at least one candidate base station, where the at least one serviceable base station is a base station currently serving the terminal, and the at least one candidate base station is a base station serving the terminal after the terminal moves out of the serviceable base station.
Drawings
FIG. 1 is a diagram illustrating a network system architecture according to an embodiment of the present invention;
FIG. 2 is a method of data transmission according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a network system architecture according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a device for data transmission according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a hardware structure of a device for data transmission according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal for data transmission according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a hardware structure of a terminal for data transmission according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present application will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a network system architecture diagram applied in the embodiment of the present invention includes a controller 100, a base station 111, a base station 112, a base station 113, a terminal 121, and a terminal 122, where in the network architecture shown in fig. 1, only the base station 111, the base station 112, and the base station 113 are shown, the number of the base stations is not limited in the embodiment of the present invention, the network system includes at least one base station, and in the network system shown in fig. 1, only two terminals, namely the terminal 121 and the terminal 122, are shown, but in the embodiment of the present invention, the number of the terminals is not limited to two.
In the prior art, the capacity of a network system is increased by increasing the number of base stations, so that frequent switching of the base stations serving a terminal is easily caused, when the terminal acquires data from a network in a dynamic movement, the frequent switching of the base stations serving the terminal easily causes loss of transmitted data, and in the case of video data, if the data is lost, the video playing of the terminal is not smooth.
To solve the above problem, as shown in fig. 2, an embodiment of the present invention provides a data transmission method, including:
step 200, after determining that data needs to be acquired, a jth terminal of N terminals served by M base stations within a control jurisdiction informs a controller of the need of acquiring data.
Step 201, after determining that a jth terminal needs to acquire data, a controller determines a scheduling policy of at least one serviceable base station for serving the jth terminal and a cache policy of at least one candidate base station, where each serviceable base station is a base station currently serving the jth terminal, each candidate base station is a base station serving the jth terminal after the jth terminal moves out of the serviceable base station, the scheduling policy of an ith serviceable base station in the at least one serviceable base station is used to instruct the ith serviceable base station to send parameter information of the data to the jth terminal, and the cache policy of a kth candidate base station in the at least one candidate base station is used to instruct the data cached by the kth candidate base station; wherein M, N, i, j and k are positive integers greater than zero, j is greater than 0 and less than or equal to N, i is greater than 0 and less than or equal to M, and k is greater than 0 and less than or equal to M.
In step 202, the controller respectively transmits a scheduling policy to at least one serviceable base station and a buffering policy to at least one candidate base station.
Step 203, each serviceable base station receives its own scheduling policy, each candidate base station receives its own caching policy, and each candidate base station caches data according to its own caching policy.
And step 204, each serviceable base station respectively sends data to the jth terminal according to the respective scheduling strategies.
In step 205, the jth terminal receives data transmitted by each of the served base stations.
In step 206, the candidate base station sends the buffered data to the jth terminal after determining to serve the jth terminal.
Step 207, the jth terminal receives the data transmitted by each candidate base station.
In the embodiment of the invention, the controller can determine the scheduling strategy of the serviceable base station for serving the terminal and the cache strategy of the candidate base station for serving the terminal aiming at the terminal needing to acquire data, so that the loss of the data acquired by the terminal in the process of switching the base stations is avoided.
It should be noted that, in the embodiment of the present invention, the scheduling policy includes information such as a rate at which the serving base station can transmit data to the terminal, a priority scheduling indication, and the like, and the caching policy includes a start position at which data needs to be cached, a size of the cached data, indication information of a priority cache, and the like.
The method for data transmission according to the embodiment of the present invention is specifically described below with reference to fig. 3 as an example, where in fig. 3, the method includes a controller 300, a base station 311, a base station 312, a base station 313, a base station 314, a base station 315, and a terminal 321, where the base station 311, the base station 312, and the base station 313 are served base stations of the terminal 321, and the base station 314 and the base station 315 are candidate base stations of the terminal 321.
The controller 300 determines a scheduling policy of the base station 311, a scheduling policy of the base station 312, and a scheduling policy of the base station 313, and a caching policy of the base station 314 and a caching policy of the base station 315, respectively, and transmits the scheduling policy of the base station 311 to the base station 311, the scheduling policy of the base station 312 to the base station 312, the scheduling policy of the base station 313 to the base station 313, the caching policy of the base station 314 to the base station 314, and the caching policy of the base station 315 to the base station 315.
It should be noted that, in the embodiment of the present invention, before determining the scheduling policy of the serviceable base station of the jth terminal and the buffer policy of the candidate base station, the controller determines the serviceable base station and the candidate base station of the jth terminal.
An implementation manner of optionally determining a serviceable base station of a jth terminal: the jth terminal receives the pilot signals transmitted by the surrounding base stations, measures the received pilot signal strength of each base station, and transmits the measured pilot signal strength of each base station to the controller. After receiving the measured pilot signal intensity of each base station sent by the jth terminal, the controller selects a base station with a load lower than a second preset threshold value from the base stations with the pilot signal intensity greater than the first preset threshold value, and takes the selected base station as a serviceable base station.
It should be understood that, in the embodiment of the present invention, the first preset threshold and the second preset threshold may be set according to actual needs.
An alternative implementation of determining candidate base stations: after determining that data needs to be acquired, the jth terminal sends mobile information of the jth terminal to the controller, the controller receives the mobile information of the jth terminal, and determines a candidate base station serving the jth terminal according to the mobile information of the jth terminal, wherein the load of the candidate base station is lower than a third preset threshold.
The movement information of the jth terminal includes information related to the terminal movement, such as the position, the speed, and the direction of the terminal movement. The controller determines base stations through which the jth terminal moves according to the movement information of the jth terminal, selects base stations with loads lower than a third threshold from the base stations through which the jth terminal moves, and takes the selected base stations as candidate base stations.
In addition, the embodiment of the present invention further provides an implementation manner of optionally determining a serviceable base station:
Figure BDA0001037498170000141
Figure BDA0001037498170000142
Figure BDA0001037498170000143
Figure BDA0001037498170000144
Figure BDA0001037498170000145
where M is a set of potentially serviceable base stations serving the jth terminal, i is the ith base station in the set M, Δ t is the size of each slot, eiFor the static energy consumption of the ith base station per time slot, fi(ρi) For the dynamic energy consumption of the ith base station per time slot,
Figure BDA0001037498170000146
to predict the rate at which the ith base station will transmit data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000147
to the rate at which the ith base station actually transmits data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000148
the buffer size for the jth terminal at the tth slot,
Figure BDA0001037498170000149
the size of the buffer for the jth terminal in the t-1 th time slot, KiIs the total number of resource blocks of the ith base station,
Figure BDA00010374981700001410
for the load of the ith base station in the t-th time slot,
Figure BDA00010374981700001411
minimum data transmission rate required for the jth terminal, N being the set of terminals, MjIs the set serving the jth terminal.
In particular, in a second implementation of determining a serviceable base station, an objective function
Figure BDA00010374981700001412
To minimize the total energy consumption of a network of M base stations, eiRepresenting static energy consumption, fi(ρi) The dynamic energy consumption is represented by the dynamic energy consumption,
Figure BDA00010374981700001413
it is ensured that each base station is not overloaded,
Figure BDA00010374981700001414
the terminal is guaranteed to obtain the required data transmission rate,
Figure BDA00010374981700001415
for indicating the buffer status of the terminal.
The objective function of the optimization problem is non-convex and can be solved by using a optimization-Minimization method. If it is found out
Figure BDA00010374981700001416
If not, the ith base station is a serving base station with a data transmission rate of
Figure BDA00010374981700001417
For obtained
Figure BDA0001037498170000151
The base station with zero is a shutdown base station, a sleep base station, a heavy load base station or a weak coverage base station, and is not a serviceable base station.
Thus, in a second implementation of determining a serviceable base station, not only the set of serviceable base stations but also the rate at which the serviceable base station transmits data to the terminal can be determined.
In addition, in the embodiment of the present invention, a selectable way of determining the data transmission rate from the ith serving base station to the jth terminal is further provided:
Figure BDA0001037498170000152
wherein r isi,jRate of data transmission r for ith serviceable base station to jth terminalj minMinimum data transmission rate required for the jth terminal; rhoiThe load of the ith serviceable base station; rhoaThe load of the a-th serviceable base station; s is the set of serviceable base stations.
After the controller determines the rate at which the serviceable base station transmits data to the terminal, optionally, the manner in which the controller determines the starting position of the candidate base station for caching data is as follows:
Figure BDA0001037498170000153
wherein D isjCaching the starting position of data for the jth terminal candidate base station, Tj' average duration of serving jth terminal for ith serviceable base station, S is set of serviceable base stations, rh,jThe rate at which data is transmitted to the jth terminal for the h serviceable base station.
Since the candidate base station can determine the initial position of the cached data, the possibility that the terminal repeatedly acquires the data or loses the data in the data acquiring process is reduced.
However, since the state of whether the base station can send data to the terminal is dynamically changed, the controller acquires the transmission capability information of the candidate base station, determines whether the candidate base station can provide service for the jth terminal according to the transmission capability information of the candidate base station, and determines whether a backhaul link of the candidate base station is limited.
It should be noted that, in the embodiment of the present invention, the transmission capability information includes information such as access load and capacity of the backhaul link, and load of the backhaul link.
If the controller determines that the candidate base station for serving the jth terminal cannot provide service for the jth terminal after the jth terminal is moved out of the serviceable base station, determining a first time length and a second time length, wherein the first time length is a time length required by the jth terminal to pass through the ith serviceable base station, and the second time length is a time length required by the jth terminal to pass through the candidate base station which cannot provide service for the jth terminal; updating the data transmission rate of the ith serving base station to the jth terminal according to the first time length and the second time length; then, the controller determines a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the jth terminal; and finally, the controller sends the updated data transmission rate of the ith serviceable base station to the jth terminal and sends a new buffer strategy to at least one candidate base station to the ith serviceable base station.
Specifically, in the embodiment of the present invention, the updated data transmission rate of the ith serviceable base station to the jth terminal satisfies the following expression:
r′i,j＝(αj+βj)ri,j*(Ti+Tk)/Ti；
wherein r'i,jFor the updated i-th serving base station to transmit data to the j-th terminal, ri,jFor the ith serving base station transmitting data to the jth terminal, αjAs a predictive compensation factor for the jth terminal, αj＞1，βjAs a backhaul compensation factor for the j terminal, βj＞0，TiDuration T for jth terminal to pass ith serviceable base stationkThe duration for the jth terminal to pass the kth candidate base station.
By the method, the rate of transmitting data to the terminal by the serving base station is increased, so that the possibility of service suspension caused by the fact that the terminal does not receive the data when the candidate base station cannot provide service to the terminal due to an accident is reduced.
If the controller determines that the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited after the jth terminal moves out of the serviceable base station, updating a rate of data transmission from the ith serviceable base station to the jth terminal according to the following mode;
r′i,j＝(1+βj)ri,j，
wherein r'i,jFor the updated i-th serving base station to transmit data to the j-th terminal, ri,jFor the ith serving base station transmitting data to the jth terminal, βjAs a backhaul compensation factor for the j terminal, βj＞0；
The controller determines a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the terminal; and sending the updated data transmission rate of the ith serviceable base station to the jth terminal and sending a new buffering strategy to at least one candidate base station to the ith serviceable base station.
Because the return link of the candidate base station is limited, the rate of the candidate base station for acquiring data from the core network is reduced, and in order not to influence the terminal to acquire the data, in the embodiment of the invention, the rate of the serving base station for transmitting the data to the terminal is increased, so that the influence of the return link limitation of the candidate base station on the data acquisition of the terminal is reduced.
Based on the same inventive concept, the embodiment of the present invention further provides a device for data transmission, and as the method corresponding to the device for data transmission is the method for data transmission in the embodiment of the present invention, reference may be made to the implementation of the method for implementing the device for data transmission in the embodiment of the present invention, and repeated details are not described again.
As shown in fig. 4, the apparatus for data transmission according to the embodiment of the present invention includes a processing unit 400 and a transceiver unit 401, wherein, the processing unit 400 is configured to, after determining that the jth terminal of the N terminals served by the M base stations needs to acquire data, determining a scheduling policy of at least one serviceable base station for serving a jth terminal and a caching policy of at least one candidate base station, wherein the at least one serviceable base station is a base station currently serving the jth terminal, the at least one candidate base station is a base station serving the jth terminal after the jth terminal moves out of the serviceable base station, the scheduling policy of an ith serviceable base station in the at least one serviceable base station is used for indicating parameter information of data sent by the ith serviceable base station to the jth terminal, and the caching policy of a kth candidate base station in the at least one candidate base station is used for indicating data cached by the kth candidate base station; the transceiver unit 401 is configured to transmit a scheduling policy to at least one serviceable base station and a buffering policy to at least one candidate base station, respectively.
Optionally, the scheduling policy of the ith serviceable base station includes a rate at which the ith serviceable base station transmits data to the jth terminal, where the rate at which the ith serviceable base station transmits data to the jth terminal satisfies the following expression:
Figure BDA0001037498170000181
wherein r isi,jRate of data transmission r for ith serviceable base station to jth terminalj minMinimum data transmission rate required for the jth terminal; rhoiThe load of the ith serviceable base station; rhoaThe load of the a-th serviceable base station; s is the set of serviceable base stations.
Optionally, the scheduling policy of the ith serviceable base station includes a rate at which the ith serviceable base station transmits data to the jth terminal, and the processing unit 400 determines the set of serviceable base stations and the rate at which the ith serviceable base station transmits data to the jth terminal by the following expressions:
Figure BDA0001037498170000182
Figure BDA0001037498170000183
Figure BDA0001037498170000184
Figure BDA0001037498170000185
Figure BDA0001037498170000186
where M is a set of potentially serviceable base stations serving the jth terminal, i is the ith base station in the set M, Δ t is the size of each slot, eiFor the static energy consumption of the ith base station per time slot, fi(ρi) For the dynamic energy consumption of the ith base station per time slot,
Figure BDA0001037498170000187
to predict the rate at which the ith base station will transmit data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000188
to the rate at which the ith base station actually transmits data to the jth terminal on one resource block in the tth slot,
Figure BDA0001037498170000189
the buffer size for the jth terminal at the tth slot,
Figure BDA00010374981700001810
the size of the buffer for the jth terminal in the t-1 th time slot, KiIs the total number of resource blocks of the ith base station,
Figure BDA00010374981700001811
for the load of the ith base station in the t-th time slot,
Figure BDA00010374981700001812
minimum data transmission rate required for jth terminal, N being the set of terminals，MjIs the set serving the jth terminal.
Optionally, the processing unit 400 is further configured to determine a first duration and a second duration if it is determined that the candidate base station for serving the jth terminal cannot provide a service for the jth terminal after the jth terminal is moved out of the serviceable base station, where the first duration is a duration required by the jth terminal to pass through the ith serviceable base station, and the second duration is a duration required by the jth terminal to pass through the candidate base station that cannot provide a service for the jth terminal; updating the data transmission rate of the ith serving base station to the jth terminal according to the first time length and the second time length; determining a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the jth terminal;
the transceiver unit 401 is further configured to send the updated data transmission rate of the ith serviceable base station to the jth terminal to the ith serviceable base station, and send a new buffering policy to at least one candidate base station.
Optionally, the processing unit 400 is further configured to update a rate at which the ith serviceable base station transmits data to the jth terminal according to the following manner if it is determined that, after the jth terminal moves out of the serviceable base station, the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited;
r′i,j＝(1+βj)ri,j，
wherein r'i,jFor the updated i-th serving base station to transmit data to the j-th terminal, ri,jFor the ith serving base station transmitting data to the jth terminal, βjAs a backhaul compensation factor for the j terminal, βj＞0；
Determining a new cache strategy of at least one candidate base station according to the updated data transmission rate of the ith serviceable base station to the terminal;
the transceiver unit 401 is further configured to send the updated data transmission rate of the ith serviceable base station to the jth terminal to the ith serviceable base station, and send a new buffering policy to at least one candidate base station.
Optionally, the caching policy includes an initial position of the candidate base station caching data, and the processing unit 400 determines the initial position of the candidate base station caching data according to the following manner:
Figure BDA0001037498170000191
wherein D isjCaching the starting position of data for the jth terminal candidate base station, Tj' average duration of serving jth terminal for ith serviceable base station, S is set of serviceable base stations, rh,jThe rate at which data is transmitted to the jth terminal for the h serviceable base station.
Optionally, the transceiver unit 401 is further configured to receive at least one pilot signal strength sent by the jth terminal before the processing unit determines that the jth terminal needs to acquire data, where each pilot signal strength is used to indicate that the jth terminal receives the strength of the pilot signal sent by the base station;
the processing unit 400 is further configured to select a base station with a load lower than a second preset threshold from the base stations with the pilot signal strength greater than the first preset threshold; and the selected base station is taken as a serviceable base station.
It should be noted that, in the embodiment of the present invention, the processing unit 400 may be implemented by a processor, and the transceiver unit 401 may be implemented by a transceiver. As shown in fig. 5, the hardware structure of the apparatus 500 for data transmission may include a processor 510, a transceiver 520, and a memory 530. The memory 530 may be used to store a program/code preinstalled at the factory of the device 500, or may store a code or the like used when the processor 510 executes it.
The various components in device 500 are coupled together by a bus system 540, wherein bus system 540 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
The processor 510 may be a general Central Processing Unit (CPU), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, configured to perform related operations to implement the technical solution provided by the embodiment of the present invention.
It should be noted that although the apparatus 500 shown in fig. 5 only shows the processor 510, the transceiver 520 and the memory 530, in a specific implementation, it should be understood by those skilled in the art that the base station also contains other components necessary for normal operation. Also, it will be apparent to those skilled in the art that the base station may also include hardware components to implement other additional functions, according to particular needs. Furthermore, those skilled in the art will appreciate that the base station may also contain only the devices or modules necessary to implement embodiments of the present invention, and need not contain all of the devices shown in fig. 5.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Based on the same inventive concept, the embodiment of the present invention further provides a data transmission terminal, and as the method corresponding to the data transmission terminal is the data transmission method in the embodiment of the present invention, reference may be made to the implementation of the method for implementing the data transmission terminal in the embodiment of the present invention, and repeated details are not repeated.
As shown in fig. 6, the terminal for data transmission according to the embodiment of the present invention includes a processing unit 600 and a transceiver unit 601, where the processing unit 600 is configured to determine that data needs to be acquired; the transceiver 601 is used to notify the controller that data needs to be acquired; receiving data sent by a serviceable base station, wherein the serviceable base station sends the data to the terminal through a scheduling policy determined by the controller, and the scheduling policy is used for indicating information indicating that the serviceable base station sends the data to the terminal; and after the terminal moves out of the serviceable base station, receiving data sent by the candidate base station, wherein the candidate base station caches the data sent to the terminal according to a caching strategy sent by the controller, and the caching strategy is used for indicating the data cached by the candidate base station.
Optionally, the transceiver 601 is further configured to send the measured pilot signal strength of at least one base station to the controller before the processing unit determines that data acquisition is required.
It should be noted that in the embodiment of the present invention, the processing unit 600 may be implemented by a processor, and the transceiver unit 601 may be implemented by a transceiver. As shown in fig. 7, the hardware structure of the terminal 700 for data transmission may include a processor 710, a transceiver 720, and a memory 730. The memory 730 may be used to store a program/code preinstalled at the time of shipment of the terminal 700, or may store a code or the like used when the processor 710 executes.
The various components in terminal 700 are coupled together by a bus system 740, wherein bus system 740 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
The processor 710 may be a general Central Processing Unit (CPU), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, configured to perform related operations to implement the technical solution provided by the embodiment of the present invention.
It should be noted that although the terminal 700 shown in fig. 7 only shows the processor 710, the transceiver 720 and the memory 730, in a specific implementation, it will be understood by those skilled in the art that the base station also comprises other components necessary for normal operation. Also, it will be apparent to those skilled in the art that the base station may also include hardware components to implement other additional functions, according to particular needs. Furthermore, those skilled in the art will appreciate that the base station may also contain only the devices or modules necessary to implement embodiments of the present invention, and need not contain all of the devices shown in fig. 7.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Based on the same inventive concept, the embodiment of the present invention further provides a data transmission system, as shown in fig. 1, for executing the data transmission method shown in fig. 2, so that the implementation of the data transmission system in the embodiment of the present invention may refer to the implementation of the method, and repeated details are not repeated.
From the above, it can be seen that: the controller determines a scheduling policy of at least one serviceable base station for servicing the jth terminal and a cache policy of at least one candidate base station after determining that the jth terminal of the N terminals serviced by the M base stations needs to acquire data, and respectively sends the scheduling policy to the at least one serviceable base station and the cache policy to the at least one candidate base station. The scheduling policy of the ith serviceable base station in the at least one serviceable base station is used for indicating parameter information of data sent by the ith serviceable base station to the jth terminal, and the caching policy of the kth candidate base station in the at least one candidate base station is used for indicating data cached by the kth candidate base station. According to the technical scheme, the controller can determine the scheduling strategy of the serviceable base station for serving the terminal and the cache strategy of the candidate base station for serving the terminal aiming at the terminal needing to acquire data, so that the loss of the data acquired by the terminal in the process of switching the base stations is avoided.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (19)

1. A method of data transmission, comprising:
after determining that a jth terminal in N terminals served by M base stations needs to acquire data, a controller determines a scheduling policy of at least one serviceable base station for serving the jth terminal and a cache policy of at least one candidate base station, where the at least one serviceable base station is a base station currently serving the jth terminal, the at least one candidate base station is a base station for serving the jth terminal after the jth terminal moves out of the serviceable base station, the scheduling policy of an ith serviceable base station in the at least one serviceable base station is used for instructing the ith serviceable base station to send parameter information of the data to the jth terminal, and the cache policy of a kth candidate base station in the at least one candidate base station is used for instructing the data cached by the kth candidate base station; the scheduling policy of the ith serviceable base station includes a rate and a priority scheduling indication of data transmission from the ith serviceable base station to the jth terminal, and the caching policy of the kth candidate base station includes a starting position of data to be cached, a size of the cached data, and indication information of priority caching;
the controller transmits a scheduling policy to at least one serviceable base station and a buffering policy to at least one candidate base station, respectively.
2. The method of claim 1, wherein the scheduling policy of the ith serving base station comprises a rate at which the ith serving base station transmits data to the jth terminal, wherein the rate at which the ith serving base station transmits data to the jth terminal satisfies the following expression:
Figure FDA0002387734240000011
wherein r isi,jA rate, r, for transmitting data from the ith serviceable base station to the jth terminalj minA minimum data transmission rate required for the jth terminal; rhoiA load for the i-th serviceable base station; rhoaA load for the a-th serviceable base station; s is the set of serviceable base stations.
3. The method of claim 1, wherein the scheduling policy of the ith serviceable base station comprises a rate at which the ith serviceable base station transmits data to the jth terminal, and wherein the controller determines the set of serviceable base stations and the rate at which the ith serviceable base station transmits data to the jth terminal by:
Figure FDA0002387734240000021
Figure FDA0002387734240000022
Figure FDA0002387734240000023
Figure FDA0002387734240000024
Figure FDA0002387734240000025
wherein M is a set of potential serviceable base stations serving the jth terminal, i is the ith base station in the set M, Δ t is the size of each time slot, eiStatic energy consumption, f, for each time slot of the ith base stationi(ρi) For the dynamic energy consumption of each time slot of the ith base station,
Figure FDA0002387734240000026
in order for the ith base station to anticipate the rate of data transmission to the jth terminal on one resource block in the tth slot,
Figure FDA0002387734240000027
for the rate at which the ith base station actually transmits data to the jth terminal on one resource block in the tth slot,
Figure FDA0002387734240000028
the buffer size of the jth terminal in the tth time slot,
Figure FDA0002387734240000029
the size of a buffer area of the jth terminal in the t-1 th time slot, KiIs the total number of resource blocks of the ith base station,
Figure FDA00023877342400000210
for the load of the ith base station in the t-th time slot,
Figure FDA00023877342400000211
minimum data transmission rate required for said jth terminal, N being a set of terminals, MjIs the set serving the jth terminal.
4. The method of claim 2 or 3, wherein the method further comprises:
if the controller determines that the candidate base station for serving the jth terminal cannot provide service for the jth terminal after the jth terminal is moved out of the serviceable base station, determining a first time duration and a second time duration, wherein the first time duration is a time duration required by the jth terminal to pass through the ith serviceable base station, and the second time duration is a time duration required by the jth terminal to pass through the candidate base station which cannot provide service for the jth terminal;
the controller updates the data transmission rate of the ith serving base station to the jth terminal according to the first duration and the second duration;
the controller determines a new caching strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the jth terminal;
and the controller sends the updated data transmission rate of the ith serviceable base station to the jth terminal and sends a new caching strategy to at least one candidate base station to the ith serviceable base station.
5. The method of claim 2 or 3, wherein the method further comprises:
if the controller determines that the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited after the jth terminal moves out of the serviceable base station, updating a data transmission rate of the ith serviceable base station to the jth terminal in the following manner;
r′i,j＝(1+βj)ri,j，
wherein r'i,jFor the updated i-th serving base station to the j-th terminal transmission data rate, ri,jFor the ith serving base station transmitting data to the jth terminal βjIs a backhaul compensation factor for the j terminal, βj＞0；
The controller determines a new caching strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the terminal;
and the controller sends the updated data transmission rate of the ith serviceable base station to the jth terminal and sends a new caching strategy to at least one candidate base station to the ith serviceable base station.
6. The method according to any one of claims 1 to 3, wherein the buffering strategy comprises a starting position of the candidate base station for buffering data, and the controller determines the starting position of the candidate base station for buffering data according to the following manner:
Figure FDA0002387734240000031
wherein D isjCaching a start position, T, of data for the jth terminal candidate base stationj' serving the ith serving base station the average duration of the jth terminal, S is the set of serving base stations, rh,jAnd transmitting data rate to the jth terminal for the h serving base station.
7. The method of claim 1 or 2, wherein the controller, prior to determining that the jth terminal needs to acquire data, further comprises:
the controller receives at least one pilot signal strength sent by the jth terminal, and each pilot signal strength is respectively used for indicating the jth terminal to receive the strength of the pilot signal sent by the base station;
the controller selects a base station with the load lower than a second preset threshold value from the base stations with the pilot signal intensity higher than the first preset threshold value;
the controller takes the selected base station as a serviceable base station.
8. A method of data transmission, comprising:
the terminal determines data needing to be acquired;
the terminal informs a controller that the data needs to be acquired;
the terminal receives data sent by a serviceable base station, wherein the serviceable base station sends the data to the terminal through a scheduling policy determined by the controller, the scheduling policy is used for indicating indication information of sending the data to the terminal by the serviceable base station, and the scheduling policy comprises a rate and a priority scheduling indication of transmitting the data to the terminal by the serviceable base station;
and after the terminal is moved out of the serviceable base station, receiving data sent by a candidate base station, wherein the candidate base station caches the data sent to the terminal according to a caching strategy sent by the controller, the caching strategy is used for indicating the data cached by the candidate base station, and the caching strategy of the candidate base station comprises an initial position of the data needing to be cached, the size of the cached data and indication information of priority caching.
9. The method of claim 8, wherein before the terminal determines that data acquisition is required, further comprising:
the terminal transmits the measured pilot signal strength of at least one base station to the controller.
10. An apparatus for data transmission, comprising:
a processing unit, configured to determine, after determining that a jth terminal of N terminals served by M base stations needs to obtain data, a scheduling policy of at least one serviceable base station and a cache policy of at least one candidate base station, where the at least one serviceable base station is a base station currently serving the jth terminal, the at least one candidate base station is a base station that the jth terminal serves the jth terminal after moving out of the serviceable base station, a scheduling policy of an ith serviceable base station of the at least one serviceable base station is used to instruct the ith serviceable base station to send parameter information of data to the jth terminal, and a cache policy of a kth candidate base station of the at least one candidate base station is used to instruct data cached by the kth candidate base station; the scheduling policy of the ith serviceable base station includes a rate and a priority scheduling indication of data transmission from the ith serviceable base station to the jth terminal, and the caching policy of the kth candidate base station includes a starting position of data to be cached, a size of the cached data, and indication information of priority caching;
a transceiver unit, configured to send a scheduling policy to at least one serviceable base station and a buffering policy to at least one candidate base station, respectively.
11. The apparatus of claim 10, wherein the scheduling policy of the ith serviceable base station comprises a rate at which the ith serviceable base station transmits data to the jth terminal, wherein the rate at which the ith serviceable base station transmits data to the jth terminal satisfies the following expression:
Figure FDA0002387734240000051
wherein r isi,jA rate, r, for transmitting data from the ith serviceable base station to the jth terminalj minA minimum data transmission rate required for the jth terminal; rhoiA load for the i-th serviceable base station; rhoaA load for the a-th serviceable base station; s is the set of serviceable base stations.
12. The apparatus of claim 10, wherein the scheduling policy of the ith serviceable base station comprises a rate at which the ith serviceable base station transmits data to the jth terminal, and wherein the processing unit determines the set of serviceable base stations and the rate at which the ith serviceable base station transmits data to the jth terminal by:
Figure FDA0002387734240000052
Figure FDA0002387734240000053
Figure FDA0002387734240000054
Figure FDA0002387734240000055
Figure FDA0002387734240000056
wherein M is a set of potential serviceable base stations serving the jth terminal, i is the ith base station in the set M, Δ t is the size of each time slot, eiStatic energy consumption, f, for each time slot of the ith base stationi(ρi) For the dynamic energy consumption of each time slot of the ith base station,
Figure FDA0002387734240000061
in order for the ith base station to anticipate the rate of data transmission to the jth terminal on one resource block in the tth slot,
Figure FDA0002387734240000062
for the rate at which the ith base station actually transmits data to the jth terminal on one resource block in the tth slot,
Figure FDA0002387734240000063
the buffer size of the jth terminal in the tth time slot,
Figure FDA0002387734240000064
the size of a buffer area of the jth terminal in the t-1 th time slot, KiIs the total number of resource blocks of the ith base station,
Figure FDA0002387734240000065
for the load of the ith base station in the t-th time slot,
Figure FDA0002387734240000066
minimum data transmission rate required for said jth terminal, N being a set of terminals, MjIs the set serving the jth terminal.
13. The device of claim 11 or 12, wherein the processing unit is further to:
if it is determined that the candidate base station for serving the jth terminal cannot provide service for the jth terminal after the jth terminal is moved out of the serviceable base station, determining a first time duration and a second time duration, wherein the first time duration is a time duration required by the jth terminal to pass through the ith serviceable base station, and the second time duration is a time duration required by the jth terminal to pass through the candidate base station which cannot provide service for the jth terminal; updating the data transmission rate of the ith serving base station to the jth terminal according to the first duration and the second duration; determining a new caching strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the jth terminal;
the transceiver unit is further configured to:
and sending the updated data transmission rate of the ith serviceable base station to the jth terminal and sending a new buffer strategy to at least one candidate base station to the ith serviceable base station.
14. The device of claim 11 or 12, wherein the processing unit is further to:
if it is determined that the candidate base station for serving the jth terminal can provide service for the jth terminal but a backhaul link is limited after the jth terminal moves out of the serviceable base station, updating a rate at which the ith serviceable base station transmits data to the jth terminal in the following manner;
r′i,j＝(1+βj)ri,j，
wherein r'i,jTo the updated ithRate, r, at which the serving base station transmits data to said jth terminali,jFor the ith serving base station transmitting data to the jth terminal βjIs a backhaul compensation factor for the j terminal, βj＞0；
Determining a new caching strategy of at least one candidate base station according to the updated data transmission rate of the ith serving base station to the terminal;
the transceiver unit is further configured to:
and sending the updated data transmission rate of the ith serviceable base station to the jth terminal and sending a new buffer strategy to at least one candidate base station to the ith serviceable base station.
15. The apparatus according to any of claims 10 to 12, wherein the buffering policy includes a starting position of the candidate base station for buffering data, and the processing unit determines the starting position of the candidate base station for buffering data according to the following manner:
Figure FDA0002387734240000071
wherein D isjCaching a start position, T, of data for the jth terminal candidate base stationj' serving the ith serving base station the average duration of the jth terminal, S is the set of serving base stations, rh,jAnd transmitting data rate to the jth terminal for the h serving base station.
16. The apparatus of claim 10 or 11, wherein the transceiver unit is further configured to:
before the processing unit determines that the jth terminal needs to acquire data, receiving at least one pilot signal strength sent by the jth terminal, wherein each pilot signal strength is used for indicating the jth terminal to receive the strength of a pilot signal sent by a base station;
the processing unit is further configured to:
selecting a base station with the load lower than a second preset threshold value from the base stations with the pilot signal intensity higher than the first preset threshold value; and using the selected base station as a serviceable base station.
17. A terminal for data transmission, comprising:
the processing unit is used for determining data needing to be acquired;
a transceiver unit for informing the controller that the data needs to be acquired; receiving data transmitted by a serviceable base station, wherein the serviceable base station transmits the data to a terminal through a scheduling policy determined by the controller, and the scheduling policy is used for indicating information indicating that the serviceable base station transmits the data to the terminal; and after the terminal moves out of the serviceable base station, receiving data sent by a candidate base station, wherein the candidate base station caches the data sent to the terminal according to a caching strategy sent by the controller, the caching strategy is used for indicating the data cached by the candidate base station, the scheduling strategy comprises a rate of transmitting the data to the terminal by the serviceable base station and a priority scheduling indication, and the caching strategy of the candidate base station comprises a starting position of the data needing to be cached, the size of the cached data and indication information of priority caching.
18. The terminal of claim 17, wherein the transceiver unit is further configured to:
sending the measured pilot signal strength of the at least one base station to the controller before the processing unit determines that data acquisition is required.
19. A system for data transmission, comprising the apparatus for data transmission according to any one of claims 10 to 16, the terminal according to claim 17 or 18, at least one serviceable base station, and at least one candidate base station, wherein the at least one serviceable base station is a base station currently serving the terminal, and the at least one candidate base station is a base station serving the terminal after the terminal moves out of the serviceable base station.
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