CN109168170B - Cloud wireless access network scheduling method, related equipment and medium - Google Patents
Cloud wireless access network scheduling method, related equipment and medium Download PDFInfo
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- CN109168170B CN109168170B CN201710517560.8A CN201710517560A CN109168170B CN 109168170 B CN109168170 B CN 109168170B CN 201710517560 A CN201710517560 A CN 201710517560A CN 109168170 B CN109168170 B CN 109168170B
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
Abstract
The application relates to the technical field of mobile communication, in particular to a cloud wireless access network scheduling method, related equipment and media, which are used for solving the problems that in the prior art, when a wireless access network selects a cooperative base station for a terminal, the cost is high, the complexity is high, the signaling overhead is large, the performance of a selected base station link needs to be improved and the like; in the embodiment of the application, when the cooperative base station set can obtain the time compensation amount of the terminal and the difference between the time compensation amount and the time advance amount is smaller than or equal to the preset value, the signal alignment between the terminal and each base station can be realized, and the link performance is improved. In addition, when the cooperative base station is selected for the terminal, a device for acquiring the position information is not needed, so that the cost can be saved; the method is simple, and the complexity of selecting the cooperative base station can be reduced without solving in a numerical integration mode; in addition, the instantaneous channel state information does not need to be estimated continuously, and the system processing resources can be saved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a cloud wireless access network scheduling method, and related devices and media.
Background
In communication between a terminal and a base station, for example, in an OFDMA system, multiple signals received by the same base station arrive at the base station due to terminal motion and different channel conditions, which may cause inter-signal inter-symbol interference. In order to solve this problem, in a conventional cellular network, i.e. in a single-user to single-base-station to point communication, a base station acquires a time offset of a user and sends the time offset to the user a Timing Advance (TA) for signal alignment. This is conventional point-to-point communication. However, as the number of terminals increases, it is difficult to satisfy more user demands from single-point communication alone. As such, a cloud wireless access network has emerged.
In the cloud wireless access network, a plurality of base stations can provide services for a plurality of terminals at the same time and the same frequency. How to select a base station serving a terminal so as to better utilize system resources of a cloud radio access network becomes an interest in the industry.
In the related art, a method for selecting a cooperative base station for a terminal in a cloud curve access network includes:
(1) MichdeZorzi et al, 2003, proposed a partner selection method based on geographical location information. The method uses a common channel to carry out channel estimation through a known pilot signal to acquire the position information of all nodes. The source node (i.e. terminal) firstly broadcasts a message containing the position information of the source node and the destination node, and all the active nodes compare the distance between the source node and the destination node after monitoring the message. And selecting the node closest to the destination node to provide service for the terminal.
(2) Hunter t.e. et al have proposed a cooperative diversity method based on channel coding, i.e. cooperative diversity based on channel coding, and have studied the network structure of cooperative diversity. Under the condition that the central controller knows all channel state information, the cooperation partners are exchanged one by one through a poor search method, the average interruption probability of all users in the whole network is compared, and therefore the cooperation partner with the lowest average interruption probability is sought.
(3) And the opportunistic relay selection algorithm is to select one relay node with the maximum channel capacity from M (M is a positive integer) alternative relays according to the instantaneous channel condition, and the relay node is used for participating in cooperative communication between the source node and the destination node within the coherence time before the channel changes.
However, the inventors found that:
in the above method (1), since it is necessary to know or estimate the distances between all the relay nodes and the destination node, it is necessary to install a distance or position estimation device in the system, and thus the cost is high.
In the method (2), the cooperative diversity based on the channel coding is a local optimal algorithm, and the method needs to solve in a numerical integration manner because a closed expression of the user interruption probability cannot be obtained, so that the complexity of the method is high.
In the method (3), the opportunistic relay selection algorithm needs to estimate the instantaneous channel state information continuously, which brings great signaling overhead, and when a plurality of nodes compete for the optimal relay simultaneously, collision is caused, which results in selection failure, and the failure probability is obviously improved along with the increase of the number of competing nodes.
In addition, the inventor also finds that in the cloud wireless access network, multiple base stations cooperatively provide services for one or more users. In the prior art, the terminal selects the TA value of one base station serving the terminal to adjust its own transmission time. Thus, for the remaining base stations, the uplink transmission time may not be aligned (i.e., the signals between the base stations are not aligned). Therefore, in the transmission of multiple base stations in uplink cooperation, whether the time between the multiple base stations is synchronous or not is an important factor influencing the performance of a link.
In summary, a new cloud wireless access scheduling method is needed to select a base station serving a terminal for the terminal.
Disclosure of Invention
The embodiment of the application provides a cloud wireless access network scheduling method, related equipment and media, which are used for solving the problems that in the prior art, when a wireless access network selects a cooperative base station for a terminal, the cost is high, the complexity is high, the signaling overhead is large, the performance of a selected base station link needs to be improved, and the like.
The embodiment of the application provides a cloud wireless access network scheduling method, which comprises the following steps:
determining an idle base station capable of providing service for a terminal;
selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets;
for each idle base station in each cooperative base station set, solving the time compensation quantity of the idle base station by the terminal, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value;
for each cooperative base station set, if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set;
selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
An embodiment of the present application further provides a base station, including a processor and a transceiver, where:
the transceiver is used for receiving a network access request of a terminal;
the processor is configured to determine an idle base station capable of providing a service for the terminal; selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets; for each cooperative base station set, solving the time compensation quantity of each idle base station in the cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set; selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
The embodiment of the present application further provides a cloud wireless access network scheduling apparatus, the apparatus includes:
an idle base station determining module, configured to determine an idle base station capable of providing a service for a terminal;
a cooperative base station set determining module, configured to select at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets;
the time compensation quantity solving module is used for solving the time compensation quantity of each idle base station in each cooperative base station set aiming at each cooperative base station set, so that the difference value between the time compensation quantity and the time advance quantity of the idle base station to the terminal is smaller than or equal to a preset value;
the alternative set determining module is used for determining the cooperative base station set as an alternative cooperative base station set if each idle base station in the cooperative base station set can solve the corresponding time compensation amount;
and the cooperative base station selection module is used for selecting one cooperative base station set from the alternative cooperative base station sets to serve the terminal.
An embodiment of the present application further provides an electronic device, including: one or more processors; and one or more computer readable media having stored thereon a program for performing cloud radio access network scheduling, wherein the program, when executed by the one or more processors, implements the steps of the cloud radio access network scheduling method in the embodiments of the present application.
One or more computer-readable media having stored thereon a program for performing cloud radio access network scheduling is also provided, wherein the program, when executed by one or more processors, causes a communication device to perform a cloud radio access network scheduling method.
Determining an idle base station capable of providing service for a terminal in the embodiment of the application; selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets; for each cooperative base station set, solving the time compensation quantity of each idle base station in the cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set; selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal. Therefore, when the cooperative base station set has a solution, that is, the mean-difference value between the time compensation quantity of each idle base station in the set and the time advance of the idle base station to the terminal is less than or equal to the preset value, it is indicated that the terminal and each idle base station in the set can realize signal alignment, time synchronization can be realized among multiple base stations, and link performance is improved. In addition, when the cooperative base station is selected for the terminal, a device for acquiring the position information is not needed, so that the cost can be saved; the method is simple, and the complexity of selecting the cooperative base station can be reduced without solving in a numerical integration mode; in addition, the instantaneous channel state information does not need to be estimated continuously, and the system processing resources can be saved.
Drawings
Fig. 1 is a flowchart illustrating a radio access network scheduling method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a radio access network scheduling method according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a radio access network scheduling apparatus according to a third embodiment of the present application;
FIG. 4 is a block diagram of a computing device according to a fourth embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a computer program product according to a fourth embodiment of the present application;
fig. 6 is a schematic structural diagram of a base station according to a fifth embodiment of the present application.
Detailed Description
The embodiment of the application provides a cloud wireless access network scheduling method. The method comprises the steps of determining an idle base station capable of providing service for a terminal; selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets; for each cooperative base station set, solving the time compensation quantity of each idle base station in the cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set; and selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
Therefore, when the cooperative base station set has a solution, that is, the mean difference value between the time compensation quantity of each idle base station in the set and the time advance quantity of the idle base station to the terminal is less than or equal to the preset value, the terminal and each idle base station in the set can realize signal alignment, time synchronization can be realized among multiple base stations, and the link performance is improved. In addition, when the cooperative base station is selected for the terminal, a device for acquiring the position information is not needed, so that the cost can be saved; the method is simple, and the complexity of selecting the cooperative base station can be reduced without solving in a numerical integration mode; in addition, the instantaneous channel state information does not need to be estimated continuously, and the system processing resources can be saved.
The embodiments of the present application will be described in further detail with reference to the drawings attached hereto.
As shown in fig. 1, a schematic flow diagram of a cloud radio access network scheduling method provided in the embodiment of the present application includes the following steps:
step 101: an idle base station capable of serving the terminal is determined.
The method for determining the idle base station in step 101 may be implemented according to the prior art, which is not limited in this application.
Step 102: selecting at least two idle base stations from the idle base stations to form a cooperative base station set; and determines a set of cooperative base stations that are different from each other.
Wherein elements of different sets of cooperative base stations, i.e. different sets of cooperative base stations, are not identical. That is, there may be an intersection or no intersection between different sets of cooperative base stations.
For example, the numbers of the determined idle base stations are 1, 3, 5 and 7 respectively. The set of cooperating base stations may be (1, 3), (3, 5), (1, 3, 7), etc.
Step 103: and solving the time compensation quantity of the idle base station by the terminal aiming at each idle base station in each cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value.
Step 104: and for each cooperative base station set, if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set.
Step 105: selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
Further, in order to better select a cooperative base station set to provide a service for the terminal and maximize the system capacity of the cloud wireless network, in this embodiment of the present application, step 105 may be specifically executed as: and calculating the channel capacity of each candidate cooperative base station set, and selecting the cooperative base station set with the maximum channel capacity.
Further, in order to further understand the cloud radio access network scheduling method provided in the embodiment of the present application, the following further describes core step 103 of the method, specifically:
in order to determine whether each idle base station in the cooperative base station set satisfies signal alignment, that is, when the same terminal is served, the terminal can be aligned with uplink transmission time of each idle base station providing service, in this embodiment of the present application, step 103 may be performed as:
step A1: and aiming at each idle base station in each cooperative base station set, taking the difference value between the time compensation quantity of the terminal to the idle base station and the time advance quantity of the idle base station to the terminal as the comparison value of the idle base station.
Step A2: and solving the compensation quantity of each idle base station to ensure that the comparison values of the idle base stations are equal.
For example, the above step a1 and step a2 can be explained by formula (1):
T1,k-x1＝T2,k-x2＝＝Tm,K-xm (1)
in the formula (1), 1,2. .., m is the mark of each idle base station in the cooperative base station set; m represents a total of m idle base stations in the set; t is1,k…..Tm,KRespectively representing the time advance of the terminal to the corresponding idle base station; x is the number of1…..xmRespectively, indicating the amount of time compensation for the terminal to the corresponding base station.
As can be seen from the disclosure (1), for a cooperative base station set, if the difference between the time offset and the time advance corresponding to each idle base station in the set is equal, it indicates that the cooperative base station set can achieve signal alignment for the terminal.
In a cooperative multi-base station system of a cloud wireless access network, due to imbalance among branches between base stations and terminals, the application range of formula (1) is generally limited. Ideal base station/terminal time offset compensation is not easily achieved.
To remedy this deficiency, a generally applicable solution can be obtained, and in the embodiments of the present application, the inventors found that there is a guard interval, i.e. a maximum tolerated time offset, in the time synchronization between the terminal and the base station. If the maximum time bias on any one branch in the multi-base station-single user combination does not exceed the maximum allowable time bias, then no time bias compensation is needed. That is, the preset value is less than or equal to the time synchronization guard interval.
Further, in order to solve the problem of time offset compensation of the base station/terminal that cannot be ideal, by adding an optimized relaxation condition to the formula (1), on the premise of satisfying the maximum system tolerance time offset constraint, the formula (1) may be changed to the formula (2), that is, the preset value in step 103 may be determined according to the formula (2):
Δt＝CP-hτ (2)
wherein Δ t represents a preset value; CP denotes a cyclic prefix length; h isτRepresenting the maximum multipath delay. For a cooperative base station set, the maximum multipath delay may be the maximum time advance of the terminal relative to each idle base station in the cooperative base station set.
Based on equation (2), in specific implementation, step 103 may be specifically executed to solve whether the following equation set (3) has a solution:
in formula (3), m (m is a positive integer) idle base stations are in total in the cooperative base station set, wherein 1, 2, ·.. and m are identifiers of the idle base stations in the cooperative base station set respectively; t is1,k…..Tm,KRespectively representing the time advance of the terminal to the corresponding idle base station; x is the number of1…..xmRespectively representing the time compensation quantity of the terminal to the corresponding base station; Δ t represents a preset value.
For any cooperative base station set, if the formula (3) of the set has a solution, it indicates that the set can be used as an alternative cooperative base station set, otherwise, the set cannot be used as an alternative cooperative base station set.
Further, after the cooperative base station set is selected, in order to better utilize system resources of the cloud wireless access network and more efficiently utilize the system, in the embodiment of the present application, a precoding technology is adopted to realize allocation of appropriate power to the terminal. Specifically, in order to reduce the computational complexity, the method further includes:
step B1: and aiming at the data to be sent to the terminal, processing the data by adopting a linear precoding technology.
In specific implementation, the precoding coefficient matrix of the linear precoding technology is a channel inversion matrix of the selected candidate cooperative base station set to the terminal.
Step B2: and sending the processed data to the terminal through the selected alternative cooperative base station set. Without loss of generality, let puIndicating a signal to be transmitted to the u-th user,
indicating the downlink channel between the idle base station and the user u, zuThe received signal of the u-th user, which is noise, can be expressed as shown in equation (4):
the data to be transmitted to the terminal is multiplied by a precoding coefficient matrix (i.e., the above-mentioned channel inversion matrix), and then transmitted to the terminal through the channel. Since the channel is exactly the inverse matrix of the precoding coefficient matrix, the terminal can multiply the received signal by the channel inverse matrix according to formula (5) and directly decode the information required by itself.
The same parameters in formula (5) and formula (4) have the same meanings, and are not described herein again. Note that W in equation (5) represents a precoding coefficient matrix.
In summary, when the cooperative base station set has a solution, that is, the average difference value between the time offset of each idle base station in the set and the time advance of the idle base station to the terminal is less than or equal to the preset value, it is indicated that the terminal and each idle base station in the set can achieve signal alignment, and time synchronization can be achieved between multiple base stations, thereby improving link performance. In addition, when the cooperative base station is selected for the terminal, a device for acquiring the position information is not needed, so that the cost can be saved; the method is simple, and the complexity of selecting the cooperative base station can be reduced without solving in a numerical integration mode; in addition, the instantaneous channel state information does not need to be estimated continuously, and the system processing resources can be saved.
In addition, by adopting the linear precoding technology, proper power can be distributed to the terminal, and the service performance of the system is improved.
Example two
In order to facilitate understanding of the cloud wireless access network scheduling method provided in the embodiment of the present application, the method is described by taking an application in a distributed antenna scenario as an example. In this scenario, RRUs (Radio Remote units) are deployed in a cell coverage area in a distributed manner, each RRU forms a plurality of antenna points of a Base station, and each point is connected to a BBU (Base band Unit) through an optical fiber, that is, a cloud Radio access network. As shown in fig. 2, a schematic flow chart of a cloud radio access network scheduling method in this scenario includes the following steps:
step 201: and the BBU receives a network access request sent by the terminal.
When the terminal is started or accesses the network, data interaction is carried out with the cloud wireless access network through the public channel so as to realize channel estimation, and a network request is sent in.
Step 202: the BBU determines an idle base station capable of providing service for the terminal.
Step 203: the BBU selects at least two idle base stations from the idle base stations to form a cooperative base station set; and determines a set of cooperative base stations that are different from each other.
Step 204: and (3) determining whether the cooperative base station set has a solution or not according to the formula (3) for each constructed cooperative base station set, and if so, executing the step 206, and if not, executing the step 205.
The formula (3) is described in the first embodiment, and is not described again.
Step 205: and the BBU rejects the set of the non-solution cooperative base stations.
Step 206: and the BBU takes the cooperative base station set with the solution as an alternative cooperative base station set.
Step 207: and the BBU calculates the channel capacity of each alternative cooperative base station set, and selects the cooperative base station set with the maximum channel capacity.
Step 208: and the BBU sends the data to be sent to the terminal and the precoding coefficient matrix to each RRU in the selected alternative cooperative base station set.
Step 209: and each RRU sends data to the terminal according to the precoding coefficient matrix.
Wherein, each RRU may send data to the terminal by using a DS (data-sharing) or CAP (compression-after-decoding) method
And each base station sends a certain column of data of the precoding coefficient matrix to the terminal so that the terminal can obtain the information required by the terminal.
The cloud wireless network scheduling method provided by the embodiment of the application is also applicable to a scene adopting a centralized antenna, that is, each base station BS forms a single point of MIMO (Multiple-Input Multiple-Output) system, and a plurality of base stations can form a plurality of Transmission Points, that is, CoMP (Coordinated Multiple Points Transmission/Reception, Coordinated multipoint Transmission).
In the application scenario, the central processing unit in the application scenario may execute the task of the BBU in the second embodiment.
EXAMPLE III
Based on the same inventive concept, the embodiment of the present application further provides a cloud wireless access device corresponding to the cloud wireless access network scheduling method, and as the principle of the device for solving the problem is similar to the method of the embodiment of the present application, the implementation of the device may refer to the implementation of the method, and repeated details are not repeated.
As shown in fig. 3, a schematic structural diagram of an apparatus provided in the embodiment of the present application includes:
an idle base station determining module 301, configured to determine an idle base station capable of providing a service for a terminal;
a cooperative base station set determining module 302, configured to select at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets;
a time compensation solving module 303, configured to solve, for each cooperative base station set, a time compensation of each idle base station in the cooperative base station set, so that a difference between the time compensation and a time advance of the idle base station for the terminal is smaller than or equal to a preset value;
an alternative set determining module 304, configured to determine the cooperative base station set as an alternative cooperative base station set if each idle base station in the cooperative base station set can solve the corresponding time compensation amount;
a cooperative base station selection module 305, configured to select a cooperative base station set from alternative cooperative base station sets for serving the terminal.
Wherein, in one embodiment, the preset value is less than or equal to the time synchronization guard interval.
Wherein, in one embodiment, the apparatus further comprises:
the preset value determining module is used for determining the preset value according to the following formula:
Δt＝CP-hτ
wherein Δ t represents a preset value;
CP denotes a cyclic prefix length;
hτrepresenting the maximum multipath delay.
In an embodiment, the time compensation solving module 303 specifically includes:
a comparison value determining unit, configured to use, for each idle base station in each cooperative base station set, a difference between a time offset of the terminal to the idle base station and a time advance of the idle base station to the terminal as a comparison value of the idle base station;
and the solving unit is used for solving the compensation quantity of each idle base station so that the comparison values of each idle base station are equal.
In an embodiment, the cooperative base station selection module 305 is specifically configured to calculate channel capacities of the candidate cooperative base station sets, and select a cooperative base station set with a largest channel capacity.
Wherein, in one embodiment, the apparatus further comprises:
a precoding technique processing module, configured to, after the cooperative base station selection module 305 selects one cooperative base station set from the alternative cooperative base station sets to serve the terminal, process data to be sent to the terminal by using a linear precoding technique;
and the sending module is used for sending the processed data to the terminal through the selected alternative cooperative base station set.
In an embodiment, the precoding coefficient matrix of the linear precoding technique is a channel inversion matrix of the selected candidate cooperative base station set to the terminal.
According to the device provided by the embodiment of the application, when the cooperative base station set has a solution, that is, the mean difference value between the time compensation amount of each idle base station in the set and the time advance amount of the idle base station to the terminal is less than or equal to the preset value, it is indicated that the terminal and each idle base station in the set can realize signal alignment, time synchronization can be realized among multiple base stations, and the link performance is improved. In addition, when the cooperative base station is selected for the terminal, a device for acquiring the position information is not needed, so that the cost can be saved; the method is simple, and the complexity of selecting the cooperative base station can be reduced without solving in a numerical integration mode; in addition, the instantaneous channel state information does not need to be estimated continuously, and the system processing resources can be saved.
Example four
The embodiment of the present application further provides a computing device, which may specifically be a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), and the like. As shown in fig. 4, the computing device may include a processor (CPU) 401, a memory 402, an input device 403, an output device 404, and the like, the input device may include a keyboard, a mouse, a touch screen, and the like, and the output device may include a Display device such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), and the like.
The memory may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides the processor with program instructions and data stored in the memory. In an embodiment of the present application, the memory may be configured to store a program of the cloud wireless access network scheduling method.
The processor is used for executing the following steps according to the obtained program instructions by calling the program instructions stored in the memory: determining an idle base station capable of providing service for a terminal; selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets; for each idle base station in each cooperative base station set, solving the time compensation quantity of the idle base station by the terminal, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; for each cooperative base station set, if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set; selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
Furthermore, the present application provides a computer storage medium for storing computer program instructions for the above computing device, which includes a program for executing the above radio access network scheduling method.
The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.
As shown in fig. 5, a program product 50 for cloud radio access network scheduling according to an embodiment of the present application is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device. However, the program product of the present invention is not limited in this regard and, in the present document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device.
EXAMPLE five
An embodiment of the present application further provides a base station, as shown in fig. 6, the base station may include a processor 601 and a transceiver 602, where:
the transceiver is used for receiving a network access request of a terminal;
the processor is configured to determine an idle base station capable of providing a service for the terminal; selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets; for each cooperative base station set, solving the time compensation quantity of each idle base station in the cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set; selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.
Claims (9)
1. A cloud wireless access network scheduling method, the method comprising:
determining an idle base station capable of providing service for a terminal;
selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets;
for each idle base station in each cooperative base station set, solving the time compensation quantity of the idle base station by the terminal, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; the preset value is less than or equal to the time synchronization protection interval; for each idle base station in each cooperative base station set, solving a time compensation amount of the terminal to the idle base station, so that a difference between the time compensation amount and a time advance of the idle base station to the terminal is less than or equal to a preset value, specifically comprising:
aiming at each idle base station in each cooperative base station set, taking the difference between the time compensation quantity of the idle base station by the terminal and the time lead quantity of the idle base station to the terminal as a comparison value of the idle base station;
solving the compensation quantity of each idle base station to ensure that the comparison values of the idle base stations are equal;
for each cooperative base station set, if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set;
selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
2. The method of claim 1, further comprising:
determining the preset value according to the following formula:
Δt＝CP-hτ
wherein Δ t represents a preset value;
CP denotes a cyclic prefix length;
hτrepresenting the maximum multipath delay.
3. The method according to any of claims 1-2, wherein selecting a cooperative base station set from alternative cooperative base station sets for serving the terminal comprises:
and calculating the channel capacity of each candidate cooperative base station set, and selecting the cooperative base station set with the maximum channel capacity.
4. The method of claim 1, wherein after selecting a set of cooperative base stations from an alternative set of cooperative base stations for serving the terminal, the method further comprises:
aiming at data to be sent to the terminal, processing the data by adopting a linear pre-coding technology;
and sending the processed data to the terminal through the selected alternative cooperative base station set.
5. The method according to claim 4, wherein the precoding coefficient matrix of the linear precoding technique is a channel inversion matrix of the selected candidate cooperative base station set to the terminal.
6. A base station comprising a processor and a transceiver, wherein:
the transceiver is used for receiving a network access request of a terminal;
the processor is configured to determine an idle base station capable of providing a service for the terminal; selecting at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets; for each cooperative base station set, solving the time compensation quantity of each idle base station in the cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value; the preset value is less than or equal to the time synchronization protection interval; for each idle base station in each cooperative base station set, solving the time compensation quantity of the idle base station by the terminal, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is less than or equal to a preset value, specifically comprising: aiming at each idle base station in each cooperative base station set, taking the difference value between the time compensation quantity of the terminal to the idle base station and the time lead quantity of the idle base station to the terminal as the comparison value of the idle base station; solving the compensation quantity of each idle base station to ensure that the comparison values of the idle base stations are equal; if each idle base station in the cooperative base station set can solve the corresponding time compensation amount, determining the cooperative base station set as an alternative cooperative base station set; and selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
7. A cloud radio access network scheduling apparatus, the apparatus comprising:
an idle base station determining module, configured to determine an idle base station capable of providing a service for a terminal;
a cooperative base station set determining module, configured to select at least two idle base stations from the idle base stations to form a cooperative base station set; determining different cooperative base station sets;
the time compensation quantity solving module is used for solving the time compensation quantity of each idle base station in each cooperative base station set aiming at each cooperative base station set, so that the difference between the time compensation quantity and the time advance quantity of the idle base station to the terminal is smaller than or equal to a preset value; the preset value is less than or equal to the time synchronization protection interval; for each idle base station in each cooperative base station set, solving a time compensation amount of the terminal to the idle base station, so that a difference between the time compensation amount and a time advance of the idle base station to the terminal is less than or equal to a preset value, specifically comprising: aiming at each idle base station in each cooperative base station set, taking the difference value between the time compensation quantity of the terminal to the idle base station and the time lead quantity of the idle base station to the terminal as the comparison value of the idle base station; solving the compensation quantity of each idle base station to ensure that the comparison values of the idle base stations are equal;
an alternative set determining module, configured to determine the cooperative base station set as an alternative cooperative base station set if each idle base station in the cooperative base station set can solve the corresponding time compensation amount;
and the cooperative base station selection module is used for selecting one cooperative base station set from the alternative cooperative base station sets for serving the terminal.
8. An electronic device, comprising: one or more processors; and one or more computer readable media having stored thereon a program for performing cloud radio access network scheduling, wherein the program when executed by the one or more processors implements the steps of the method as recited in any of claims 1-5.
9. One or more computer readable media having stored thereon a program for performing cloud radio access network scheduling, wherein the program, when executed by one or more processors, causes a communication device to perform the method of any of claims 1-5.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711186A (en) * | 2012-05-10 | 2012-10-03 | 中国科学院计算技术研究所 | Method and device for selecting time advanced-adjustment reference nodes in CoMP (coordinated multi-point) uplinks |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN101895921B (en) * | 2009-05-18 | 2012-10-10 | 普天信息技术研究院有限公司 | Method for selecting coordinated multipoint cell |
| WO2011032308A1 (en) * | 2009-09-15 | 2011-03-24 | 华为技术有限公司 | Uplink synchronization processing method, user equipment and base station |
| CN102740447B (en) * | 2011-04-13 | 2016-05-25 | 华为技术有限公司 | Determine method, terminal device and the network equipment of Timing Advance |
| WO2013122164A1 (en) * | 2012-02-14 | 2013-08-22 | 京セラ株式会社 | Mobile communication system, base station, and communication control method |
| US20140071856A1 (en) * | 2012-09-10 | 2014-03-13 | At&T Mobility Ii Llc | Timing advance information for adapting neighbor relations |
| WO2014043870A1 (en) * | 2012-09-20 | 2014-03-27 | 华为技术有限公司 | Coordinated multi-point communication method, base station and user equipment |
| CN104754665B (en) * | 2013-12-30 | 2018-05-25 | 上海诺基亚贝尔股份有限公司 | A kind of switching method and equipment being used for user equipment under CoMP patterns |
-
2017
- 2017-06-29 CN CN201710517560.8A patent/CN109168170B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711186A (en) * | 2012-05-10 | 2012-10-03 | 中国科学院计算技术研究所 | Method and device for selecting time advanced-adjustment reference nodes in CoMP (coordinated multi-point) uplinks |
Non-Patent Citations (6)
| Title |
|---|
| amp ; Text Proposal".《3GPP tsg_ran\WG1_RL1》.2009, * |
| Huawei等.R1-090823 "Discussion on Timing Advance issue in CoMP amp * |
| R1-090518 "Discussion on Timing Advance issue in CoMP";Huawei等;《3GPP tsg_ran\WG1_RL1》;20090114;全文 * |
| R1-112072 "On timing advance calculation using time difference measurement";Ericsson等;《3GPP tsg_ran\WG1_RL1》;20110816;全文 * |
| R1-112216 "Discussion on RAN2 LS - timing advance calculation using time difference";Intel Corporation;《3GPP tsg_ran\WG1_RL1》;20110815;全文 * |
| 基于跨层机制的最佳协作中继选择及其系统实现;邹玉龙等;《通信学报》;20080815(第08期);全文 * |
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