CN109168170A - Cloud Radio Access Network dispatching method and relevant device, medium - Google Patents
Cloud Radio Access Network dispatching method and relevant device, medium Download PDFInfo
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- CN109168170A CN109168170A CN201710517560.8A CN201710517560A CN109168170A CN 109168170 A CN109168170 A CN 109168170A CN 201710517560 A CN201710517560 A CN 201710517560A CN 109168170 A CN109168170 A CN 109168170A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
- H04W56/00—Synchronisation arrangements
- 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
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Abstract
This application involves mobile communication technology fields, more particularly to cloud Radio Access Network dispatching method and relevant device, medium, to solve Radio Access Network existing in the prior art be terminal select cooperative base station when, it is at high cost, complexity is high, signaling overheads is big, select base station link performance it is to be improved the problems such as；In the embodiment of the present application, it when cooperative base station set can acquire the time bias amount of terminal, its difference between Timing Advance is made to be less than or equal to preset value, can be realized the signal alignment of terminal Yu each base station, improve link performance.Also, it, being capable of save the cost without obtaining the device of location information when the embodiment of the present application is that terminal selects cooperative base station；It is solved using simple method, without solving the complexity that can reduce selection cooperative base station by way of numerical integration；In addition, system processing resources can be saved without constantly estimation instantaneous channel state information.
Description
Technical field
This application involves field of communication technology more particularly to cloud Radio Access Network dispatching methods and relevant device, medium.
Background technique
In the communication of terminal and base station, such as in OFDMA system, due to terminal movement and channel status difference, together
The received multiple signals in one base station, which reach the base station, can generate intersymbol interference between signal.In order to solve this problem, traditional bee
In nest network, i.e., for single user in single base station point to point link, base station obtains the time migration of user, can be sent to user one
TA (Timing Advance, Timing Advance), to carry out signal alignment.This is that traditional single-point is communicated to single-point.However with
Being continuously increased for terminal quantity, individually to single-point communicate be difficult to meet more user demands.It is wirelessly connect so there is cloud
Enter network.
In cloud Radio Access Network, multiple base stations can provide service with frequency simultaneously for multiple terminals.So for one
How to be selected for a terminal then as the base station of its service, in order to be able to the more preferable system resource for utilizing cloud Radio Access Network,
As focus in the industry.
In the related technology, include: for the method for terminal selection cooperative base station in cloud curve access network
(1), MichdeZorzi in 2003 et al. proposes the Partnership Selection Method based on geographical location information.This method
By known pilot signal, channel estimation is carried out using common signal channel, obtains the location information of all nodes.(i.e. by source node
Terminal) message comprising oneself and destination node location information is broadcasted first, after all active nodes listen to message, than
Compared with oneself at a distance from destination node.The node nearest from destination node is selected as terminal and provides service.
(2), Hunter T.E. et al. proposes the collaboration diversity method based on channel coding, i.e., based on channel coding
Collaboration diversity, and the network structure of collaboration diversity is studied.In channel state informations all known to master controller
In the case of, affiliate is exchanged one by one by searching method thoroughly, compares the average interrupt probability of all users in whole network, to seek
It is averaging the minimum affiliate of outage probability.
(3), opportunistic relay selection algorithm is selected from M (M is positive integer) a alternative relaying according to instantaneous channel conditions
One relay node with maximum channel capacity, for participating in source node and purpose in the coherence time before channel variation
Collaboration communication between node.
However, it is found by the inventors that:
In the above method (1), due to needing to know or estimate the distance between all relay nodes and destination node,
Need to be equipped with distance or position estimation device, thus higher cost in system.
In the above method (2), the collaboration diversity based on channel coding is a kind of local optimum algorithm, and this method by
In the closure expression formula that cannot get user's outage probability, need to solve by way of numerical integration, so, the complexity of this method
Degree is high.
In the above method (3), opportunistic relay selection algorithm needs constantly estimation instantaneous channel state information, brings very big
Signaling overheads, and when multiple nodes simultaneously compete best relay when can cause to conflict, so as to cause selection failure, and with
The increase probability of failure of competition interstitial content significantly improves.
In addition, inventor also found, in cloud Radio Access Network, more base station collaborations provide clothes for one or more users
Business.And in the prior art, terminal is selected as the TA value of a base station of its service, to adjust oneself launch time.It is right in this way
For remaining base station, it is possible to will appear the case where uplink transmission time is not aligned (signal is misaligned between i.e. each base station).
Therefore in uplink coordinated more base station transmission, whether the time is synchronized between more base stations, is a key factor for influencing link performance.
In conclusion needing a kind of new cloud wireless access dispatching method, the base station of its service is selected as terminal.
Summary of the invention
The embodiment of the present application provides cloud Radio Access Network dispatching method and relevant device, medium, to solve existing skill
The problems in art Radio Access Network be terminal select cooperative base station when, it is at high cost, complexity is high, signaling overheads is big, select
Base station link performance equal problem to be improved.
The embodiment of the present application provides a kind of cloud Radio Access Network dispatching method, which comprises
It is determined to provide the idle base station of service for terminal；
At least two idle base stations are selected from idle base station constitutes a cooperative base station set；And it determines each other not
Same cooperative base station set；
For the idle base station of each of each cooperative base station set, solves the terminal and the time of the free time base station is mended
The amount of repaying, so that the time bias amount and the free time base station are less than or equal in advance the difference between the Timing Advance of the terminal
If value；
For each cooperative base station set, if in the cooperative base station set it is each free time base station can solve arrive it is corresponding when
Between compensation rate, then the cooperative base station set is determined as alternative cooperative base station set；
Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.
The embodiment of the present application also provides a kind of base station, including processor and transceiver, in which:
The transceiver, the networking for receiving terminal are requested；
The processor provides the idle base station of service for the terminal for being determined to；It is selected from idle base station
At least two idle base stations constitute a cooperative base station set out；And determine cooperative base station set different from each other；For every
A cooperative base station set solves the time bias amount of the idle base station of each of the cooperative base station set, so that the time bias
Amount and the free time base station are less than or equal to preset value to the difference between the Timing Advance of the terminal；And if cooperation base
Each idle base station can be solved to corresponding time bias amount in set of standing, then be determined as alternatively assisting by the cooperative base station set
Make collection of base stations；Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.
The embodiment of the present application also provides a kind of cloud Radio Access Network dispatching device, and described device includes:
Idle base station determining module provides the idle base station of service for terminal for being determined to；
Cooperative base station set determining module constitutes an association for selecting at least two idle base stations from idle base station
Make collection of base stations；And determine cooperative base station set different from each other；
Time bias amount solves module, for being directed to each cooperative base station set, solves every in the cooperative base station set
The time bias amount of a free time base station, so that the time bias amount and the free time base station are between the Timing Advance of the terminal
Difference be less than or equal to preset value；
Alternative set determining module, if can be solved for idle base station each in the cooperative base station set when arriving corresponding
Between compensation rate, then the cooperative base station set is determined as alternative cooperative base station set；
Cooperative base station selecting module, for selecting a cooperative base station set for taking from alternative cooperative base station set
It is engaged in the terminal.
The embodiment of the present application also provides a kind of electronic equipment, comprising: one or more processors；And one or more meters
Calculation machine readable medium is stored with the program for executing the scheduling of cloud Radio Access Network on the readable medium, wherein the journey
When sequence is executed by one or more of processors, the step of the cloud Radio Access Network dispatching method in the embodiment of the present application is realized
Suddenly.
The embodiment of the present application also provides one or more computer-readable mediums, is stored on the readable medium for holding
The program of the Radio Access Network that racks scheduling, wherein when described program is executed by one or more processors, so that communication equipment
Execute cloud Radio Access Network dispatching method.
It is determined to provide the idle base station of service for terminal in the embodiment of the present application；It is selected at least from idle base station
Two idle base stations constitute a cooperative base station set；And determine cooperative base station set different from each other；For each cooperation
Collection of base stations solves the time bias amount of the idle base station of each of the cooperative base station set so that the time bias amount with should
Idle base station is less than or equal to preset value to the difference between the Timing Advance of the terminal；And if cooperative base station set
In each idle base station can solve and arrive corresponding time bias amount, then the cooperative base station set is determined as alternative cooperative base station
Set；Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.In this way, when cooperation base
Set of standing has solution, i.e., the time bias amount of each free time base station and free time base station are to the Timing Advance of the terminal in the set
Between equal difference when being less than or equal to preset value, illustrate that each idle base station in terminal and the set can realize signal
Alignment can realize time synchronization between more base stations, improve link performance.Also, the embodiment of the present application is terminal selection cooperation
It, being capable of save the cost without obtaining the device of location information when base station；It is solved using simple method, without logical
The mode for crossing numerical integration solves the complexity that can reduce selection cooperative base station；In addition, without constantly estimation transient channel shape
State information can save system processing resources.
Detailed description of the invention
Fig. 1 is the flow diagram for the Radio Access Network dispatching method that the embodiment of the present application one provides；
Fig. 2 is the flow diagram for the Radio Access Network dispatching method that the embodiment of the present application two provides；
Fig. 3 is the structural schematic diagram for the Radio Access Network dispatching device that the embodiment of the present application three provides；
Fig. 4 is the structure chart for the calculating equipment that the embodiment of the present application four provides；
Fig. 5 is the structural schematic diagram for the computer program product that the embodiment of the present application four provides；
Fig. 6 is the structural schematic diagram for the base station that the embodiment of the present application five provides.
Specific embodiment
The embodiment of the present application provides a kind of cloud Radio Access Network dispatching method.This method includes being determined to mention for terminal
For the idle base station of service；At least two idle base stations are selected from idle base station constitutes a cooperative base station set；And really
Make cooperative base station set different from each other；For each cooperative base station set, each sky in the cooperative base station set is solved
The time bias amount of not busy base station, so that the time bias amount and the free time base station are to the difference between the Timing Advance of the terminal
Value is less than or equal to preset value；And if each equal can solve in free time base station arrives corresponding time bias in the cooperative base station set
Amount, then be determined as alternative cooperative base station set for the cooperative base station set；An association is selected from alternative cooperative base station set
Make collection of base stations for servicing the terminal.
In this way, when cooperative base station set has solution, i.e., the time bias amount of each free time base station and the free time base station in the set
To the equal difference between the Timing Advance of the terminal be less than or equal to preset value when, illustrate terminal with it is each in the set
Idle base station can realize signal alignment, and time synchronization can be realized between more base stations, improve link performance.Also, this Shen
Please embodiment be terminal select cooperative base station when, being capable of save the cost without obtaining the device of location information；Using simple side
Method is solved, without solving the complexity that can reduce selection cooperative base station by way of numerical integration；In addition, nothing
It need to constantly estimate instantaneous channel state information, system processing resources can be saved.
The embodiment of the present application is described in further detail with reference to the accompanying drawings of the specification.
As shown in Figure 1, be the flow diagram of cloud Radio Access Network dispatching method provided by the embodiments of the present application, including
Following steps:
Step 101: being determined to provide the idle base station of service for terminal.
Wherein, the method that step 101 determines idle base station realizes that the application does not limit this according to the prior art
It is fixed.
Step 102: selecting at least two idle base stations from idle base station and constitute a cooperative base station set；And it determines
Cooperative base station set different from each other out.
Wherein, cooperative base station set different from each other, i.e., the element between different cooperative base station set are not exactly the same.Also
It is to say, there can be intersection between different cooperative base station set, can also have intersection.
For example, the number for the idle base station determined is respectively 1,3,5,7.Then cooperative base station set can for (1,3),
(3,5), (1,3,7) etc..
Step 103: for the idle base station of each of each cooperative base station set, solving the terminal to the free time base station
Time bias amount so that the time bias amount and the free time base station are less than the difference between the Timing Advance of the terminal
Or it is equal to preset value.
Step 104: each cooperative base station set is directed to, if each equal can solve in free time base station is arrived in the cooperative base station set
The cooperative base station set is then determined as alternative cooperative base station set by corresponding time bias amount.
Step 105: selecting a cooperative base station set for servicing the terminal from alternative cooperative base station set.
Further, go out cooperative base station collection in order to better choice and be combined into terminal and service is provided, make cloud wirelessly then
The power system capacity of network is maximum, and in the embodiment of the present application, step 105 can be executed specifically are as follows: calculates each alternative cooperative base station set
Channel capacity, and select the maximum cooperative base station set of channel capacity.
Further, for the ease of further appreciating that cloud Radio Access Network dispatching method provided by the embodiments of the present application,
The core procedure of this method 103 is described further below, specific:
When in order to determine whether each free time base station meets signal alignment, as same terminal service in cooperative base station set,
The terminal can be aligned with each idle base station uplink transmission time for the service that provides, and in the embodiment of the present application, step 103 can be held
Behavior:
Step A1: for the idle base station of each of each cooperative base station set, by the terminal to the free time base station
Time bias amount, with the free time base station to difference the compareing as the free time base station between the Timing Advance of the terminal
Value.
Step A2: solving the compensation rate of each idle base station, so that the control value of each free time base station is equal.
For example, can be illustrated with formula (1) to above-mentioned steps A1 and step A2:
T1,k-x1=T2,k-x2==Tm,K-xm (1)
In formula (1), 1,2 ..., m be respectively in cooperative base station set it is each free time base station mark；M is indicated should
M idle base station is shared in set；T1,k…..Tm,KTerminal is respectively indicated to the Timing Advance of respective free base station；x1…
..xmTerminal is respectively indicated to the time bias amount of corresponding base station.
By publicity (1) it is found that for a cooperative base station set, if each base station corresponding time free time in the set
Difference between compensation rate and Timing Advance is equal, then illustrates that the cooperative base station set can be realized letter for the terminal
Number alignment.
In the more base station systems of cooperation of cloud Radio Access Network, due between the branch between each base station-terminal
Lack of uniformity, under normal circumstances, the restricted application of formula (1).It is mended partially when being not easily accomplished ideal base station/terminal
It repays.
In order to make up this deficiency, blanket solution can be obtained, in the embodiment of the present application, invention human hair
Existing, there are inclined when protection interval, i.e. maximum tolerance for the time synchronization between terminal and base station.If in more base stations-single user combination
Be not above partially when the maximum of any one branch road it is inclined when maximum tolerance, then being just not necessarily to carry out partial compensation for the time.That is,
The preset value is less than or equal to time synchronization protection interval.
Further, in order to solve the problems, such as it is above-mentioned can not ideal base station/terminal partial compensation for the time, by above-mentioned formula
(1) optimization relaxation condition is added, under the premise of constraint partially when meeting system maximum tolerance, above-mentioned formula (1) be can be changed to such as formula
(2) described, it can the preset value in step 103 is determined according to formula (2):
Δ t=CP-hτ (2)
Wherein, Δ t indicates preset value；CP indicates circulating prefix-length；hτIndicate maximum multipath time delay.Wherein, for one
A cooperative base station set, maximum multipath time delay can be maximum of the terminal relative to each idle base station in the cooperative base station set
Timing Advance.
Based on formula (2), when it is implemented, it is to solve whether following equation group (3) have solution that step 103, which can be executed specifically:
M (m is positive integer) a idle base station is shared in formula (3), in cooperative base station set, wherein 1,2 ...,
M is respectively the mark of each free time base station in cooperative base station set；T1,k…..Tm,KTerminal is respectively indicated to respective free base station
Timing Advance；x1…..xmTerminal is respectively indicated to the time bias amount of corresponding base station；Δ t indicates preset value.
Illustrate that the set can be used as alternative association if the formula (3) of the set has solution for any cooperative base station set
Make collection of base stations, otherwise, which cannot function as alternative cooperative base station set.
Further, after selecting cooperative base station set, in order to the system for preferably utilizing cloud Radio Access Network
Resource more efficiently utilizes the system, in the embodiment of the present application, be embodied as the suitable function of terminal distribution using precoding technique
Rate.Specifically, in order to reduce computation complexity, the method also includes:
Step B1: for the data for being sent to the terminal, the data are handled using Linear Precoding.
When it is implemented, the precoding coefficients matrix of the Linear Precoding is the alternative cooperative base station set of selection
To the channel Inverted matrix of the terminal.
Step B2: treated data are sent to the terminal by the alternative cooperative base station set of selection.Do not lose one
As property, enable puIndicate the signal that be sent to u-th of user,Indicate the down channel between idle base station and user u, zu
For noise, the reception signal of so u-th user can be expressed as shown in formula (4):
After the data of terminal will be needed to be sent to multiplied by precoding coefficients matrix (i.e. above-mentioned channel Inverted matrix), pass through
Channel is sent to terminal.Since channel is just precoding coefficients inverse of a matrix matrix, so terminal can be right according to formula (5)
Received signal directly decodes out oneself information needed multiplied by channel Inverted matrix.
Wherein, identical as the identical meaning of parameters met in formula (4) in formula (5), details are not described herein.It needs to illustrate
Be that W in formula (5) indicates precoding coefficients matrix.
In conclusion when cooperative base station set has solution, i.e., the time bias amount of each free time base station and the free time in the set
When base station is less than or equal to preset value to the equal difference between the Timing Advance of the terminal, illustrate in terminal and the set
Each free time base station can realize signal alignment, and time synchronization can be realized between more base stations, improves link performance.Also,
It, being capable of save the cost without obtaining the device of location information when the embodiment of the present application is that terminal selects cooperative base station；Using simple
Method solved, without solved by way of numerical integration can reduce selection cooperative base station complexity；This
Outside, without constantly estimation instantaneous channel state information, system processing resources can be saved.
In addition, can be the suitable power of terminal distribution, improve the service performance of system using Linear Precoding.
Embodiment two
Cloud Radio Access Network dispatching method provided by the embodiments of the present application in order to facilitate understanding, to apply using distribution
This method is illustrated for formula antenna scene.The scene uses RRU (Radio Remote Unit, remote radio list
Member) to disperse to be deployed in cell coverage area, each radio frequency remote unit RRU forms the mutiple antennas point of base station, and each point passes through
Optical fiber and BBU (Building Base band Unit, baseband processing unit) are connected, i.e. cloud Radio Access Network.Such as Fig. 2
It is shown, for the flow diagram of cloud Radio Access Network dispatching method under the scene, comprising the following steps:
Step 201:BBU receives the networking request that terminal is sent.
Wherein, it for terminal, when booting or networking, is carried out by common signal channel with cloud Radio Access Network
Data interaction to realize channel estimation, and transmits into net request.
Step 202:BBU is determined to provide the idle base station of service for terminal.
Step 203:BBU selects at least two idle base stations from idle base station and constitutes a cooperative base station set；And
Determine cooperative base station set different from each other.
Step 204: for each cooperative base station set of building, whether which being determined according to formula (3)
There is solution, if there is solution to then follow the steps 206, if thening follow the steps 205 without solution.
Wherein, formula (3) illustrates in example 1, repeats no more secondary.
Step 205:BBU rejects the cooperative base station set of no solution.
Step 206:BBU is by the cooperative base station set for having solution alternately cooperative base station set.
Step 207:BBU calculates the channel capacity of each alternative cooperative base station set, and selects the maximum cooperation of channel capacity
Collection of base stations.
The data for being sent to the terminal and precoding coefficients matrix are sent to the standby of selection by step 208:BBU
Select each RRU in cooperative base station set.
Step 209: each RRU sends the data to terminal according to precoding coefficients matrix.
Wherein, each RRU can use DS (data-sharing, data sharing mode) or CAP (compression-
After-precoding compresses pass-through mode) send the data to terminal
Wherein, there are multiple base stations for terminal service in the cooperative base station set selected, which is constituted more than one days
Linear system system, each base station send a certain column data of precoding coefficients matrix to terminal, needed for obtaining itself in order to terminal
Information.
Cloud wireless network dispatching method provided by the embodiments of the present application is also applied for the scene using centralized antenna, i.e., often
A base station BS constitutes MIMO (Multiple-Input Multiple-Output, multi-input multi-output system) single-point, more
A base station can be formed by multiple transmission point, i.e. CoMP (Coordinated Multiple Points Transmission/
Reception, cooperative multipoint transmission).
Times of BBU in above-described embodiment two is executed by the central processing unit in the application scenarios in the application scenarios
Business.
Embodiment three
Based on the same inventive concept, a kind of and cloud Radio Access Network dispatching method pair is additionally provided in the embodiment of the present application
The cloud wireless access device answered, since the principle that the device solves the problems, such as is similar to the method for the embodiment of the present application, the dress
The implementation set may refer to the implementation of method, and overlaps will not be repeated.
As shown in figure 3, being apparatus structure schematic diagram provided by the embodiments of the present application, comprising:
Idle base station determining module 301 provides the idle base station of service for terminal for being determined to；
Cooperative base station set determining module 302 constitutes one for selecting at least two idle base stations from idle base station
A cooperative base station set；And determine cooperative base station set different from each other；
Time bias amount solves module 303, for being directed to each cooperative base station set, solves in the cooperative base station set
The time bias amount of each free time base station so that the time bias amount and free time base station to the Timing Advance of the terminal it
Between difference be less than or equal to preset value；
It is alternative to gather determining module 304, if can solve for idle base station each in the cooperative base station set to correspondence
Time bias amount, then the cooperative base station set is determined as alternative cooperative base station set；
Cooperative base station selecting module 305, for selecting a cooperative base station collection to share from alternative cooperative base station set
In the service terminal.
Wherein, in one embodiment, the preset value is less than or equal to time synchronization protection interval.
Wherein, in one embodiment, described device further include:
Preset value determining module, application determine the preset value according to the following formula:
Δ t=CP-hτ
Wherein, Δ t indicates preset value；
CP indicates circulating prefix-length；
hτIndicate maximum multipath time delay.
Wherein, in one embodiment, time bias amount solves module 303, specifically includes:
Control value determination unit, for being directed to the idle base station of each of each cooperative base station set, by the terminal pair
The time bias amount of the free time base station, with the free time base station to the difference between the Timing Advance of the terminal as the free time
The control value of base station；
Unit is solved, for solving the compensation rate of each idle base station, so that the control value of each free time base station is equal.
Wherein, in one embodiment, cooperative base station selecting module 305 is specifically used for calculating each alternative cooperative base station collection
The channel capacity of conjunction, and select the maximum cooperative base station set of channel capacity.
Wherein, in one embodiment, described device further include:
Precoding technique processing module, for being selected from alternative cooperative base station set in cooperative base station selecting module 305
A cooperative base station set is selected for after servicing the terminal, for the data for being sent to the terminal, using linear pre-
Coding techniques handles the data；
Sending module, for treated data to be sent to the terminal by the alternative cooperative base station set of selection.
Wherein, in one embodiment, the precoding coefficients matrix of the Linear Precoding is the alternative association of selection
Make collection of base stations to the channel Inverted matrix of the terminal.
Device provided by the embodiments of the present application, when cooperative base station set has solution, i.e., the time of each free time base station in the set
When compensation rate and the free time base station are less than or equal to preset value to the equal difference between the Timing Advance of the terminal, illustrate end
End can realize signal alignment with each idle base station in the set, and time synchronization can be realized between more base stations, is improved
Link performance.Also, when the embodiment of the present application is that terminal selects cooperative base station, without obtaining the device of location information, Neng Goujie
About cost；It is solved using simple method, can reduce selection cooperation without solving by way of numerical integration
The complexity of base station；In addition, system processing resources can be saved without constantly estimation instantaneous channel state information.
Example IV
The embodiment of the present application also provides a kind of calculating equipment, which is specifically as follows desktop computer, portable
Formula computer, smart phone, tablet computer, personal digital assistant (Personal Digital Assistant, PDA) etc..Such as
Shown in Fig. 4, which may include processor (Center Processing Unit, CPU) 401, memory 402, defeated
Enter equipment 403, output equipment 404 etc., input equipment may include keyboard, mouse, touch screen etc., and output equipment may include showing
Show equipment, as liquid crystal display (Liquid Crystal Display, LCD), cathode-ray tube (Cathode Ray Tube,
CRT) etc..
Memory may include read-only memory (ROM) and random access memory (RAM), and provide storage to processor
The program instruction and data stored in device.In the embodiment of the present application, memory can be used for storing cloud Radio Access Network tune
The program of degree method.
Processor is by the program instruction for calling memory to store, and processor according to the program instruction of acquisition for executing:
It is determined to provide the idle base station of service for terminal；At least two idle base stations are selected from idle base station constitutes an association
Make collection of base stations；And determine cooperative base station set different from each other；For the idle base of each of each cooperative base station set
It stands, solves the terminal to the time bias amount of the free time base station, so that the time bias amount and the free time base station are to the end
Difference between the Timing Advance at end is less than or equal to preset value；For each cooperative base station set, if the cooperative base station collection
Each free time base station can be solved to corresponding time bias amount in conjunction, then the cooperative base station set is determined as the base that alternatively cooperates
It stands set；Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.
In addition, the embodiment of the present application provides a kind of computer storage medium, for being stored as used in above-mentioned calculating equipment
Computer program instructions, it includes the programs for executing above-mentioned Radio Access Network dispatching method.
The computer storage medium can be any usable medium or data storage device that computer can access, packet
Include but be not limited to magnetic storage (such as floppy disk, hard disk, tape, magneto-optic disk (MO) etc.), optical memory (such as CD, DVD,
BD, HVD etc.) and semiconductor memory (such as it is ROM, EPROM, EEPROM, nonvolatile memory (NAND FLASH), solid
State hard disk (SSD)) etc..
It is produced as shown in figure 5, describing according to the program for the scheduling of cloud Radio Access Network of presently filed embodiment
Product 50, can be using portable compact disc read only memory (CD-ROM) and including program code, and can be in terminal device
Upper operation.However, program product of the invention is without being limited thereto, in this document, readable storage medium storing program for executing can be it is any include or
The tangible medium of program is stored, which can be commanded execution system, device or device use or in connection.
Readable signal medium may include in a base band or as the data-signal that carrier wave a part is propagated, wherein carrying
Readable program code.The data-signal of this propagation can take various forms, including --- but being not limited to --- electromagnetism letter
Number, optical signal or above-mentioned any appropriate combination.Readable signal medium can also be other than readable storage medium storing program for executing it is any can
Read medium, the readable medium can send, propagate or transmit for by instruction execution system, device or device use or
Program in connection.
The program for executing operation of the present invention can be write with any combination of one or more programming languages
Code, described program design language include object oriented program language-Java, C++ etc., further include conventional
Procedural programming language-such as " C " language or similar programming language.Program code can be fully in user
It is executed in equipment, part executes on a user device, part executes on a remote computing or sets completely in remote computation
It is executed on standby or server.In the situation for being related to remote computing device, remote computing device can pass through the net of any kind
Network --- it is connected to user equipment including local area network (LAN) or wide area network (WAN)-, or, it may be connected to outside calculates and sets
It is standby.
Embodiment five
The embodiment of the present application also provides a kind of base station, as shown in fig. 6, the base station may include processor 601 and transceiver
602, in which:
The transceiver, the networking for receiving terminal are requested；
The processor provides the idle base station of service for the terminal for being determined to；It is selected from idle base station
At least two idle base stations constitute a cooperative base station set out；And determine cooperative base station set different from each other；For every
A cooperative base station set solves the time bias amount of the idle base station of each of the cooperative base station set, so that the time bias
Amount and the free time base station are less than or equal to preset value to the difference between the Timing Advance of the terminal；And if cooperation base
Each idle base station can be solved to corresponding time bias amount in set of standing, then be determined as alternatively assisting by the cooperative base station set
Make collection of base stations；Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although
The application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (11)
1. a kind of cloud Radio Access Network dispatching method, which is characterized in that the described method includes:
It is determined to provide the idle base station of service for terminal；
At least two idle base stations are selected from idle base station constitutes a cooperative base station set；And it determines different from each other
Cooperative base station set；
For the idle base station of each of each cooperative base station set, the terminal is solved to the time bias of the free time base station
Amount is preset so that the time bias amount and the free time base station are less than or equal to the difference between the Timing Advance of the terminal
Value；
For each cooperative base station set, if each free time base station can be solved to benefit of corresponding time in the cooperative base station set
The cooperative base station set is then determined as alternative cooperative base station set by the amount of repaying；
Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.
2. the method according to claim 1, wherein the preset value is less than or equal between time synchronization protection
Every.
3. according to the method described in claim 2, it is characterized in that, the method also includes:
The preset value is determined according to the following formula:
Δ t=CP-hτ
Wherein, Δ t indicates preset value；
CP indicates circulating prefix-length；
hτIndicate maximum multipath time delay.
4. the method according to claim 1, wherein for the idle base of each of each cooperative base station set
It stands, solves the terminal to the time bias amount of the free time base station, so that the time bias amount and the free time base station are to the end
Difference between the Timing Advance at end is less than or equal to preset value, specifically includes:
For the idle base station of each of each cooperative base station set, by the terminal to the time bias amount of the free time base station,
With the control value of the free time base station to the difference between the Timing Advance of the terminal as the free time base station；
The compensation rate of each idle base station is solved, so that the control value of each free time base station is equal.
5. method according to any one of claims 1-4, which is characterized in that select one from alternative cooperative base station set
A cooperative base station set is used to service the terminal, specifically includes:
The channel capacity of each alternative cooperative base station set is calculated, and selects the maximum cooperative base station set of channel capacity.
6. the method according to claim 1, wherein selecting a cooperation base from alternative cooperative base station set
After set stand for servicing the terminal, the method also includes:
For the data for being sent to the terminal, the data are handled using Linear Precoding；
Treated data are sent to the terminal by the alternative cooperative base station set of selection.
7. according to the method described in claim 6, it is characterized in that, the precoding coefficients matrix of the Linear Precoding is
Channel Inverted matrix of the alternative cooperative base station set of selection to the terminal.
8. a kind of base station, which is characterized in that including processor and transceiver, in which:
The transceiver, the networking for receiving terminal are requested；
The processor provides the idle base station of service for the terminal for being determined to；Selected from idle base station to
Few two idle base stations constitute a cooperative base station set；And determine cooperative base station set different from each other；For each association
Make collection of base stations, solve the time bias amount of the idle base station of each of the cooperative base station set so that the time bias amount with
The free time base station is less than or equal to preset value to the difference between the Timing Advance of the terminal；And if cooperative base station collection
Each free time base station can be solved to corresponding time bias amount in conjunction, then the cooperative base station set is determined as the base that alternatively cooperates
It stands set；Select a cooperative base station set for servicing the terminal from alternative cooperative base station set.
9. a kind of cloud Radio Access Network dispatching device, which is characterized in that described device includes:
Idle base station determining module provides the idle base station of service for terminal for being determined to；
Cooperative base station set determining module constitutes a cooperation base for selecting at least two idle base stations from idle base station
It stands set；And determine cooperative base station set different from each other；
Time bias amount solves module, for being directed to each cooperative base station set, solves each sky in the cooperative base station set
The time bias amount of not busy base station, so that the time bias amount and the free time base station are to the difference between the Timing Advance of the terminal
Value is less than or equal to preset value；
Alternative set determining module is mended if can solve to the corresponding time for idle base station each in the cooperative base station set
The cooperative base station set is then determined as alternative cooperative base station set by the amount of repaying；
Cooperative base station selecting module, for selecting a cooperative base station set for servicing institute from alternative cooperative base station set
State terminal.
10. a kind of electronic equipment characterized by comprising one or more processors；And it is one or more computer-readable
Medium is stored with the program for executing the scheduling of cloud Radio Access Network on the readable medium, wherein described program is described
When one or more processors execute, realize such as the step of any one of claim 1~7 the method.
11. one or more computer-readable mediums, which is characterized in that be stored on the readable medium wireless for executing cloud
Access the program of network scheduling, wherein when described program is executed by one or more processors, so that communication equipment is executed as weighed
Benefit require any one of 1~7 described in method.
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