CN104244429A - Scheduling method for cells, and scheduling equipment thereof - Google Patents
Scheduling method for cells, and scheduling equipment thereof Download PDFInfo
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Abstract
The invention provides a scheduling method for cells, and scheduling equipment thereof. The scheduling method comprises the steps of: determining the switching state of the cell on a plurality of frequency resources; exchanging the switching state on the plurality of frequency resources with adjacent cells of the cell; and scheduling based on a plurality of kinds of channel state information which is fed back from a user of the cell and switching states of the adjacent cells on the plurality of frequency resources. Through the scheduling method and scheduling equipment, scheduling can be performed in an ultra-short time interval. Furthermore channel state information which is fed back from the user is considered when scheduling is performed, so that a scheduling result can be better adapted for wireless environment change, thereby improving system performance.
Description
Technical field
The present invention relates to wireless communication field, and be specifically related to a kind of dispatching method for community and controlling equipment.
Background technology
In coordinate multipoint (Comp) transmission technology, the multiple communities (or base station) comprising the neighbor cell of Serving cell and this Serving cell send signal/from travelling carriage Received signal strength to travelling carriage to cooperatively, to reduce the interference between community, improve the received signal quality of base station/travelling carriage, thus improve the throughput of communication system.For this reason, need to carry out cooperative scheduling between described multiple community.Propose concentrated cooperative scheduling method, in this approach, intensively processed the information (such as channel condition information) of the scheduling for each community by central scheduler and intensively each community dispatched based on these information.But owing to needing to carry out the process relevant with multiple community and scheduling simultaneously, the Method compare of this centralized dispatching is complicated, and proposes higher requirement to the disposal ability of central scheduler.
In order to solve the problem, propose distributed collaborative scheduling, wherein, replacing carrying out centralized dispatching to multiple community, the scheduling of a scheduler for this community is arranged to each community.Distributed collaborative scheduling complexity is lower, also reduces the requirement of the disposal ability of scheduler.Develop two kinds of distributed collaborative dispatching methods, namely strengthen Inter-Cell Interference Coordination (eICIC) and proportional frequency is reused (FFR).EICIC method is used in the cooperative scheduling carrying out time domain in heterogeneous network, and FFR method is used in the cooperative scheduling carrying out frequency domain in homogeneous network.But these two kinds of methods all belong to semi-static cooperative scheduling method.Such as, in FFR, dispatch with the longer time interval (such as hundreds of millisecond), this makes scheduling result can not adapt to vertiginous wireless environment, thus the performance gain brought to system is limited.
Therefore, a kind of method and apparatus that dynamically can carry out distributed scheduling when multi-cell cooperating is needed.
Summary of the invention
Consider above problem and propose the present invention.An object of the present invention is to provide a kind of dispatching method for community and controlling equipment, it can be dispatched each community in a distributed fashion dynamically when multi-cell cooperating, make scheduling result can be adapted to the change of wireless environment, thus effectively improve the performance of system.
According to an aspect of the present invention, provide a kind of dispatching method for community, comprising: determine the on off state of described community in multiple frequency resource; The on off state in the described multiple frequency resource of each leisure is exchanged with the neighbor cell of described community; And dispatch based on multiple channel condition information and the described neighbor cell on off state in described multiple frequency resource of the user feedback of described community.
According to a further aspect in the invention, provide a kind of controlling equipment for community, comprising: pre-scheduling device, be configured to determine the on off state of described community in multiple frequency resource; Communicator, is configured to exchange the on off state in the described multiple frequency resource of each leisure with the neighbor cell of described community; And dispatching device, multiple channel condition information and the described neighbor cell on off state in described multiple frequency resource be configured to based on the user feedback of described community is dispatched.
By according to the dispatching method of the above-mentioned aspect of the present invention and controlling equipment, can dispatch independently each community in a frequency domain, instead of carry out centralized dispatching to multiple community, thus scheduler is without the need for very high disposal ability.In addition, in dispatching method in above-mentioned according to the present invention and controlling equipment, can dispatch with the very short time interval (such as 1 millisecond), and the channel condition information considered when operation dispatching from user feedback, because described channel condition information can reflect the dynamic change of wireless environment, therefore, relative to traditional Semi-static scheduling method, scheduling result can be adapted to the change of wireless environment better, thus improves the performance of communication system.
Accompanying drawing explanation
Embodiments of the present invention is described in detail in conjunction with the drawings, and above and other objects of the present invention, feature, advantage will become apparent, wherein:
Figure 1A and Figure 1B schematically illustrates the application scenarios of embodiments of the invention.
Fig. 2 is the flow chart of the dispatching method for community illustrated according to a first embodiment of the present invention.
Fig. 3 is the flow chart of the detailed operation that the step S201 shown in Fig. 2 is shown.
Fig. 4 be illustrate according to a second embodiment of the present invention, the flow chart of determining the detailed operation of the on off state of described community on multiple frequency subband.
Fig. 5 be illustrate according to a third embodiment of the present invention, the flow chart of determining the detailed operation of the on off state of described community on multiple frequency subband.
Fig. 6 is the block diagram of the controlling equipment for community illustrated according to the embodiment of the present invention.
Fig. 7 is the block diagram of the example arrangement that the dispatching device 603 shown in Fig. 6 is shown.
Fig. 8 is the block diagram of the first example arrangement that the pre-scheduling device 601 shown in Fig. 6 is shown.
Fig. 9 is the block diagram of the second example arrangement that the pre-scheduling device 601 shown in Fig. 6 is shown.
Figure 10 is the block diagram of the 3rd example arrangement that the pre-scheduling device 601 shown in Fig. 6 is shown.
Embodiment
The dispatching method for community according to the embodiment of the present invention and controlling equipment are described below with reference to accompanying drawings.In the accompanying drawings, identical reference number represents identical element from start to finish.Be to be understood that: the embodiments described herein is only illustrative, and should not be interpreted as limiting the scope of the invention.
First, the exemplary application scene of the embodiment of the present invention is described with reference to Figure 1A and Figure 1B.
Figure 1A shows the first exemplary application scene.This scene is based on centralized Radio Access Network (C-RAN) framework, wherein, by control unit (such as Base Band Unit (BBU)) and be connected to this Base Band Unit multiple (for the sake of simplicity, illustrating three in figure ia) long distance wireless head RRH forms centralized base station eNB, each RRH and can form a community.These three communities form the collaboration set of CoMP.Can arrange a BBU for each community (or RRH), described BBU can serve as scheduler to carry out the scheduling of respective cell.Figure 1B shows the second exemplary application scene, and wherein three base station eNB form three communities respectively.These three communities form collaboration set.A scheduler (not shown) can be set in each eNB to carry out the scheduling of respective cell.Will be appreciated that, although only illustrate that in Figure 1A and Figure 1B the quantity of three RRH and three eNB, RRH and eNB is not limited to 3, but can be any right quantity determined according to actual needs.
Below, reference Fig. 2 describes the dispatching method for community according to a first embodiment of the present invention.As mentioned above, the method can by for the scheduler of each community or BBU(BBU1, BBU2 or BBU3 such as shown in Figure 1A) perform to carry out the scheduling of respective cell, thus realize the distributed scheduling in multi-cell cooperating situation.In an embodiment of the present invention, using frequency subband or Resource Block as the example of described frequency resource, will be appreciated that, described frequency resource also can be can by the frequency resource of the other types of the elementary cell worked as dispatcher.
As shown in Figure 2, for the community of wanting operation dispatching, in step s 201, the on off state of described community on multiple frequency subband is determined.Hereinafter, for convenience of description, the current community of operation dispatching of wanting is called Serving cell.
In Comp transmission technology, cooperative scheduling is carried out to the multiple communities belonging to same collaboration set, to coordinate transmission and the reception of each community, thus reduce the interference between community.In an embodiment of the present invention, by for each frequency subband in described multiple frequency subband, optionally close the one or more communities in (mute) described multiple community, namely make described one or more community not send data on this frequency subband, reduce the interference that other communities are subject to.Therefore, need to determine the on off state of each community on each frequency subband (or being called switching mode (pattern)), that is, each community is opened or is closed on each frequency subband, and this can be called the pre-scheduling of community.
Below, be described in greater detail in step S201 with reference to Fig. 3 the method determining the on off state of described Serving cell on multiple frequency subband.
As shown in Figure 3, in step S2011, calculate the performance loss of the Serving cell when each frequency subband of Serving cell in described multiple frequency subband is closed.
Particularly, suppose total n frequency subband, the maximum performance P of this Serving cell that can obtain when Serving cell is not closed on all n frequency subband can be calculated
max., can dispatch on each frequency subband, to determine the user distributing to each frequency subband for this reason.Such as, for each frequency subband, can according to the CSI(of each user feedback from Serving cell as mentioned below) calculate the performance corresponding with this user, and the best user of selectivity is as the user distributing to this frequency subband.Then, can estimate that the user being assigned to each frequency subband carries out the performance sum of the Serving cell that communication can obtain, this corresponds to the maximum performance of Serving cell.Described performance can be the throughput of community, in this case, can calculate the throughput sum that can be realized by distributed user on each frequency subband, as the maximum performance of this Serving cell.The method of the performance of the Serving cell that estimation can obtain on each frequency subband is well known in the art, here repeats no more.
Next, the performance of the Serving cell when each frequency subband of Serving cell in described multiple frequency subband is closed can be calculated.Particularly, the estate performance P when the first frequency subband of Serving cell in this n frequency subband is closed can be calculated
sb1-mute.Such as, can dispatch on each frequency subband of other except first frequency subband, to determine the user distributing to other each frequency subbands, then calculate the performance P of the Serving cell that can obtain when being communicated by distributed user on each frequency subband of other except first frequency subband
sb1-mute.Similarly, can calculate when Serving cell second frequency subband, the 3rd frequency subband ... the performance P of the Serving cell that can obtain when the n-th frequency subband is closed
sb2-mute, P
sb3-mute..., P
sbn-mute.
Then, based on the maximum performance P of Serving cell
maxwith the performance P of the community when Serving cell is closed on each frequency subband
sb1-mute, P
sb2-mute, P
sb3-mute..., P
sbn-mute, the estate performance loss when Serving cell is closed on each frequency subband can be calculated.In an embodiment of the present invention, the performance P of the community when Serving cell is closed on each frequency subband can be calculated respectively
sb1-mute, P
sb2-mute, P
sb3-mute..., P
sbn-mutewith described maximum performance P
maxbetween ratio r
sb1-mute, r
sb2-mute, r
sb3-mute..., r
sbn-mute, because this ratio can reflect that the estate performance caused because Serving cell is closed on each frequency subband is relative to described maximum performance P
maxreduction degree, therefore it can reflect described performance loss indirectly.In another embodiment, can the maximum performance P of calculation services community
maxwith the performance P of the community when Serving cell is closed on each frequency subband
sb1-mute, P
sb2-mute, P
sb3-mute..., P
sbn-mutebetween difference, and use each difference with maximum performance P
maxbetween ratio directly reflect described performance loss.In an embodiment again, also can directly use each difference described as described performance loss.
Next, in step S2012, whether the performance loss according to the Serving cell when Serving cell is closed on each frequency subband exceedes loss threshold value, determines the on off state of Serving cell on this frequency subband.In an embodiment of the present invention, can respectively by ratio r
sb1-mute, r
sb2-mute, r
sb3-mute..., r
sbn-muterespectively with rate threshold r
thresholdcompare, to determine whether described performance loss exceedes loss threshold value, wherein, loss threshold value may be calculated 1-r
threshold.Such as, when with frequency subband i(1≤i≤n) corresponding ratio r
sbi-mutebe greater than rate threshold r
thresholdtime, if this illustrates that Serving cell is closed on frequency subband i, then the performance loss of Serving cell is less than loss threshold value, namely, this frequency subband is closed the performance impact of Serving cell to this Serving cell less, therefore, can determine that the on off state of Serving cell on this frequency subband is for closing.Otherwise, if ratio r
sbi-mutebe less than rate threshold r
thresholdif this illustrates that Serving cell is closed on frequency subband i, and the performance loss of Serving cell is greater than loss threshold value, that is, this frequency subband is closed Serving cell comparatively large to the performance impact of this Serving cell, therefore, can determine should not close this Serving cell.Can see, described rate threshold is larger, and namely loss threshold value is less, then Serving cell is closed on fewer frequency subband, otherwise described rate threshold is less, and namely loss threshold value is larger, then Serving cell is closed on more frequency subbands.Described rate threshold can need according to design and/or other factors set neatly.Rate threshold can be set to fixed value.Such as, this rate threshold can be set to (n-1)/n, this means that Serving cell can be closed at least one frequency subband.Or this rate threshold can be set to loss threshold value corresponding to 0.95(is 5%), therefore, work as ratio r
sbi-muteduring more than 95%, described community is closed on this frequency subband i, otherwise described community is opened on this frequency subband i.In addition, also rate threshold can be set to variable value.Such as rate threshold can be set to the value that dynamically can change according to the business load of network, make when business load is larger, rate threshold can be increased, thus the frequency subband that described community may be closed thereon reduces, and when business load is less, rate threshold can be reduced, thus the frequency subband that described community may be closed increases thereon.
By performing the operation shown in Fig. 3 for each frequency subband, the on off state of described community on each frequency subband can be determined.
Return Fig. 2, in step S202, exchange the on off state (or switching mode) on the described multiple frequency subband of each leisure with the neighbor cell of described Serving cell.Such as, back haul link (backhaul) can be passed through between Serving cell and neighbor cell, exchange on off state on the described multiple frequency subband of each leisure.Like this, the on off state of other communities on each frequency subband can be known in each community in collaboration set.
Then, in step S203, the multiple channel condition information that the user's (travelling carriage) based on Serving cell feeds back and the neighbor cell on off state on described multiple frequency subband is dispatched.
Particularly, for each frequency subband, in order to the user's (travelling carriage) to Serving cell dispatches, need to know the radio channel state between this user and base station of Serving cell.For this reason, the channel condition information (CSI) of described radio channel state can be reflected from this user to base station feedback, such as CQI (CQI).In an embodiment of the present invention, for each frequency subband, can from multiple CSI corresponding to the different on off states of user feedback and Serving cell and described neighbor cell.Such as, when collaboration set comprises multiple community, these communities can have all open, Close All and partially opening and multiple on off state such as part closedown etc.The different on off states of described Serving cell and described neighbor cell can be all or part of in these on off states.Particularly, described user can calculate and all or part of the corresponding CSI in these on off states, and is fed back to Serving cell (base station).The concrete grammar that described user calculates the CSI corresponding with various on off state is well known in the art, here repeats no more.In an embodiment of the present invention, described user can be the edge customer of Serving cell, and in other embodiments, described user can be any user of Serving cell.
Owing to having known the on off state of the neighbor cell of Serving cell on each frequency subband in step S202, therefore, for each frequency subband, the CSI corresponding with the on off state of described neighbor cell can be selected from the multiple CSI of user feedback, then dispatch based on selected CSI, such as carry out the selection of the MCS grade of the user distributing to this frequency subband, make user use this MSC grade to carry out the transmission of data.Such as, Liang Ge community is comprised (namely in collaboration set, Serving cell and a neighbor cell) when, if for certain frequency subband, the on off state of Serving cell is for opening, the on off state of neighbor cell, then can from the multiple CSI of user feedback for closing, select to open with Serving cell and CSI corresponding to the neighbor cell state of closing to carry out described scheduling.As another example, (Serving cell, three communities is comprised in collaboration set, neighbor cell 1, neighbor cell 2) when, if for certain frequency subband, the on off state of Serving cell is for opening, the on off state of neighbor cell 1 is for opening, the on off state of neighbor cell 2 is for closing, and the cooperation cell distributing to the user of this frequency subband is community 3, then can from distribute to this frequency subband user feedback multiple CSI select to open with Serving cell, neighbor cell 1 is opened and CSI corresponding to state that close of neighbor cell 2, and carry out described scheduling based on this CSI.
In dispatching method according to a first embodiment of the present invention, dispatch based on multiple channel condition information and the neighbor cell on off state on described multiple frequency subband from user feedback, this make by be scheduling to user select MCS grade be adapted to better dispatch time radio channel state, namely, scheduling result is made to be adapted to the change of wireless environment better, thus can systematic function be improved, the throughput of such as system.
Will be appreciated that, dispatching method according to a first embodiment of the present invention mentioned above is illustrative, and nonrestrictive.Those skilled in the art can need to make a change it according to design, and do not deviate from the spirit and scope of the present invention.Such as, in above-mentioned steps S201, calculate the performance loss of the Serving cell when Serving cell is closed on a frequency subband, and whether exceed loss threshold value according to this performance loss, determine the on off state of Serving cell at this frequency subband.Alternatively, the performance loss of the Serving cell when Serving cell is closed on two or more frequency subbands can be calculated, and whether exceed loss threshold value according to this performance loss, determine the on off state of Serving cell on two or more frequency subbands described.In this case, can the maximum performance P of calculation services community as described above
max, then can calculate the performance of the Serving cell when Serving cell is closed on two or more frequency subbands described simultaneously, thus obtain the performance loss of the Serving cell when Serving cell is closed on two or more frequency subbands described simultaneously.Subsequently, whether can exceed loss threshold value according to described performance loss, determine the on off state of Serving cell on two or more frequency subbands described.Such as, when described performance loss exceedes loss threshold value, can determine that Serving cell is opened on two or more frequency subbands described, and when described performance loss is no more than loss threshold value, can determine that Serving cell is closed on two or more frequency subbands described simultaneously.Described loss threshold value can be arranged in as described above such, here repeats no more.
In dispatching method according to a first embodiment of the present invention, when determining the on off state of Serving cell on multiple frequency subband in step s 201, only considering the information (such as CSI) of Serving cell, and not considering the information of adjacent base station.From the angle of whole collaboration set, the on off state determined like this is not necessarily optimal.Particularly, the method closes this Serving cell when oneself performance loss of Deterministic service community is less, the interference to neighbor cell is reduced with hope, but, owing to not considering neighbor cell when determining on off state, if therefore on certain frequency subband, the on off state of Serving cell is confirmed as closing, this may produce two kinds of results: (1) makes the performance of this Serving cell reduce although Serving cell is closed, but therefore neighbor cell but can obtain larger performance gain, in this case, from the angle of whole collaboration set, can think that determined on off state is suitable, (2) Serving cell is closed and the performance of this Serving cell is reduced, and this self-sacrifice of Serving cell simultaneously but can not make neighbor cell obtain larger performance gain, and in this case, determined on off state is obviously unsuitable.In order to address this problem, propose dispatching method according to a second embodiment of the present invention, in this approach, when determining the on off state of Serving cell, consider the information from neighbor cell.
Compared with each step S201-S203 of dispatching method according to a first embodiment of the present invention, the difference of method according to a second embodiment of the present invention is only to perform step S201(namely, determines the on off state of Serving cell on each frequency subband) concrete mode different.For the sake of simplicity, hereinafter, only will be described this difference, and omit the detailed description to same section.
Fig. 4 show according to a second embodiment of the present invention for the dispatching method of community in perform step S201(namely, determine the on off state of Serving cell on described multiple frequency subband) concrete mode.
As shown in Figure 4, in step S2011 ', pre-scheduling is carried out to determine to distribute to the user of this frequency subband to each frequency subband in described multiple frequency subband.The user distributing to each frequency subband can be determined according to the mode described with reference to Fig. 3 hereinbefore.
Next, in step S2012 ', for each frequency subband, determine whether distributed user is edge customer, if the user distributed is edge customer, then the turn-off request of closing on this frequency subband described cooperation cell is sent request to the cooperation cell (neighbor cell) of this edge customer.It should be noted that if the user distributed for certain frequency subband is not edge customer, then do not send described turn-off request, in other words, for this frequency subband, do not need to perform step S2012 '.Any method well known in the art can be used to determine, and whether distributed user is edge customer, omits it here and describes in detail.
Then, in step S2013 ', receive from neighbor cell, turn-off request that request service community is closed on this frequency subband.Particularly, because the neighbor cell in collaboration set is also performing dispatching method according to a second embodiment of the present invention, therefore neighbor cell also may send described turn-off request to Serving cell, and correspondingly, Serving cell can receive the turn-off request from neighbor cell.
Next, in step S2014 ', according to the quantity of turn-off request of transmission and the quantity of the turn-off request of reception, determine the on off state of Serving cell on this frequency subband.
Particularly, a counter can be set for each frequency subband, its initial value can be set to 0, and whenever sending a turn-off request from Serving cell to other communities, just the value of this counter is reduced 1, and when cell receiver is to a turn-off request from neighbor cell, just the value of the counter arranged for this frequency subband is increased by 1.Therefore, the value of described counter is the difference of the quantity of the quantity of the turn-off request of cell receiver and the turn-off request of transmission, like this, the value of this counter can be used to determine the on off state of Serving cell on this frequency subband.Such as, an amount threshold can be set, and whether be greater than this amount threshold according to the value of counter and determine whether Serving cell should be closed on this frequency subband.Described amount threshold can be set as any suitable value neatly according to many factors (such as according to the closeness of community).Preferably, described amount threshold can be set to the value being not less than 1, such as 1 or 2.Described amount threshold is being set in the example of 1, for certain frequency subband, if the value of counter is greater than this amount threshold 1, this illustrates at least more than sent turn-off request one of the turn-off request received, in other words, the quantity of the neighbor cell that the quantity of neighbor cell that request service community is closed is closed more than serviced cell request, therefore, Serving cell can be closed, make neighbor cell can obtain larger performance gain, otherwise, then can open Serving cell, make Serving cell can obtain larger performance gain.Can recognize, set amount threshold is larger, and Serving cell is more difficult to be closed, and in other words, in each community of collaboration set, pent community is fewer.
After determining the on off state of Serving cell on each frequency subband as mentioned above, the step identical with S203 with the step S202 described with reference to Fig. 2 can be performed, thus realize the scheduling of community user.Here repeat no more.
In dispatching method according to a second embodiment of the present invention, consider that the turn-off request that sends to neighbor cell from Serving cell and the relative populations of turn-off request that sends to Serving cell from neighbor cell are to determine the on off state of Serving cell.This makes when determining the on off state of Serving cell, has taken into account the impact that may cause the performance of neighbor cell, thus avoids as much as possible bringing significant harmful effect to the performance of neighbor cell.
The dispatching method for community is according to a third embodiment of the present invention described below.Compared with each step S201-S203 of dispatching method according to a first embodiment of the present invention, the difference of method according to a third embodiment of the present invention is only to perform step S201(namely, determine the on off state of Serving cell on described multiple frequency subband) concrete mode different, it have also contemplated that the information from adjacent base station.For the sake of simplicity, hereinafter, only will be described this difference, and omit the description to same section.
Below, with reference to Fig. 5 be described according to a third embodiment of the present invention for performing step S201(namely in the dispatching method of community, determine the on off state of Serving cell on multiple frequency subband) concrete mode.
As shown in Figure 5, in step S2011 ' ', pre-scheduling is carried out to determine to distribute to the user of this frequency subband to each frequency subband in described multiple frequency subband.The user distributing to each frequency subband can be determined according to the mode described with reference to Fig. 3 hereinbefore.
In step S2012 ' ', for each frequency subband, determine whether distributed user is edge customer, if the user distributed is edge customer, then the first information is sent to the cooperation cell of this edge customer, the performance gain (when not closing relative to described cooperation cell) that the instruction of this first information will bring to described community when described cooperation cell is closed in this frequency resource.
Particularly, for each frequency subband, can a definition performance gain table in advance, the gamut of its performance gain each community in collaboration set on this frequency subband can closed due to other communities and can obtain is divided into multiple interval, and represents each interval with corresponding many bit informations.Such as, whole performance gain scope can be divided into 4 intervals, and represent each interval with 2 bit values, in this case, an example of described performance gain table is as shown in table 1 below:
| Performance gain | 2 bit values | Explanation |
| （-∞,1） | 00 | If cooperation cell is closed, performance gain very little (being less than 1) |
| （1，3） | 01 | If cooperation cell is closed, in performance gain is positioned at (1,3) interval |
| （3，5） | 10 | If cooperation cell is closed, in performance gain is positioned at (3,5) interval |
| （5，∞） | 11 | If cooperation cell is closed, performance gain is greater than 5 |
Table 1
Like this, when carrying out the scheduling of Serving cell, if for certain frequency subband, the user distributed is edge customer, then can determine the performance gain that Serving cell will obtain when the cooperation cell of this user is closed, and according to performance gain table mentioned above, the information of the described performance gain of corresponding instruction is sent (namely to described cooperation cell, the first information), make when described cooperation cell receives this first information, can know according to this performance gain table and oneself close the performance gain will brought to described Serving cell.Such as, when described performance gain is 4, binary value " 10 " can be sent to cooperation cell as the described first information, make the cooperation cell receiving this binary value obtain oneself closedown and the performance gain brought to Serving cell is in interval (3,5).It should be noted that if the user distributed to certain frequency subband is not edge customer, then do not send the described first information, in other words, for this frequency subband, do not need to perform step S2012 ' '.
Next, in step S2013 ', receive the second information from neighbor cell, the performance gain that the instruction of this second information will bring to described neighbor cell when Serving cell is closed on this frequency subband.Particularly, because the neighbor cell in collaboration set is also performing dispatching method according to a third embodiment of the present invention, therefore neighbor cell also may to send according to mode mentioned above the information of performance gain that instruction will bring to described neighbor cell when Serving cell is closed on this frequency subband, i.e. the second information to Serving cell.Correspondingly, Serving cell can receive this second information.
Then, in step S2014 ' ', according to the first information and the second information, determine the on off state of described community on this frequency subband.Such as, for this frequency subband, if the performance gain (or performance gain sum) of the first information instruction that Serving cell sends is less than the performance gain (or performance gain sum) of the second information instruction received from neighbor cell, then can determine that the on off state of Serving cell on this frequency subband is for closing, otherwise can determine that Serving cell is opened on this frequency subband.Particularly, can arrange a counter for each frequency subband, its initial value can be set to 0.In addition, different increments can be given to different performance gains interval, make when receiving the second information between instruction different performance gain region, the value of counter is increased corresponding increment, and when have sent the first information between instruction different performance gain region, the value of counter is reduced corresponding increment.Then, whether be greater than predetermined threshold according to the value of counter and determine the on off state of Serving cell on this frequency subband.Described predetermined threshold can need to arrange neatly according to design, and such as 0.In example shown in table 1, such as can be arranged so that if send or have received binary value " 00 ", then keep Counter Value constant, if send/receive binary value " 01 ", then Counter Value is reduced/increase by 2, if send/receive binary value " 10 ", then Counter Value is reduced/increase by 4, if send/receive binary value " 11 ", then Counter Value is reduced/has increased by 6.Then, by Counter Value and the threshold value 0 preset are compared.If Counter Value is greater than 0, this illustrates that Serving cell is closed the performance gain brought to neighbor cell and is greater than neighbor cell and closes the performance gain brought to Serving cell, considers, should close Serving cell from the angle of whole collaboration set.Otherwise if Counter Value is less than 0, this illustrates that Serving cell is closed the performance gain brought to neighbor cell and is less than neighbor cell and closes the performance gain brought to Serving cell, considers, should open Serving cell from the angle of whole collaboration set.
After determining the on off state of Serving cell on multiple frequency subband as mentioned above, the step identical with S203 with the step S202 described with reference to Fig. 2 can be performed, thus realize the scheduling of community user.Here repeat no more.
Relative to dispatching method according to a first embodiment of the present invention, dispatching method is according to a third embodiment of the present invention when determining the on off state of Serving cell on each frequency subband, have also contemplated that the information from neighbor cell, thus taken into account the impact that may cause the performance of neighbor cell, avoid bringing significant harmful effect to the performance of neighbor cell.In addition, relative to dispatching method according to a second embodiment of the present invention, in dispatching method according to a third embodiment of the present invention, because described first and second information show to close the performance gain that brings to neighbor cell and owing to closing the performance gain brought to Serving cell in neighbor cell due to Serving cell more accurately, therefore, the scheduling result of such acquisition has considered the performance of each community in collaboration set, thus effectively improves the performance of whole collaboration set.
Below, describe the controlling equipment for community according to the embodiment of the present invention with reference to Fig. 6, it can perform the dispatching method for community described hereinbefore.As described above, for each community in collaboration set arranges a controlling equipment.Such as, in the application scenarios shown in Figure 1A and Figure 1B, for community 1-3 arranges controlling equipment respectively.These three controlling equipments can be connected via back haul link.These controlling equipments can be arranged on as BBU in the control unit shown in Figure 1A, or are separately positioned in each eNB shown in Figure 1B.In figure 6, show three controlling equipments being respectively used to community 1-3, because their structure is substantially identical with operation, be therefore described for example for the controlling equipment 600 of community 1 hereinafter.
As shown in Figure 6, controlling equipment 600 comprises pre-scheduling device 601, communicator 602 and dispatching device 603.
Pre-scheduling device 601 determines Serving cell (the being community 1 in figure 6) on off state (i.e. switching mode) on multiple frequency subband.Pre-scheduling device 601 can be realized with various ways, pre-scheduling device 601 will be described in detail after a while.
Communicator 602 exchanges the on off state on the described multiple frequency subband of each leisure with the neighbor cell (being community 2 and 3 in figure 6) of Serving cell.Such as, communicator 602 can communicate with the communicator (not shown) of neighbor cell via back haul link, to exchange described on off state.
Dispatching device 603 is dispatched based on multiple CSI and the described neighbor cell on off state on described multiple frequency subband of the user feedback of Serving cell.As described above, described multiple CSI comprises CSI corresponding from the different on off states of described community and described neighbor cell respectively.Fig. 7 shows the concrete structure of dispatching device 603.As shown in Figure 7, dispatching device 603 can comprise selected cell 6031 and scheduling unit 6032.Selected cell 6031 for each frequency subband, can select the CSI corresponding with the on off state of described neighbor cell from described multiple CSI.Scheduling unit 6032 can be dispatched based on selected CSI.Such as, scheduling unit 6031 can be dispatched the user distributing to this frequency subband based on selected CSI, selects the MCS grade of this user, makes user use this MSC grade to carry out the transmission of data.Selected cell 6031 and scheduling unit 6032 can perform its operation according to the mode described with reference to Fig. 2 hereinbefore, omit its detailed description for the sake of simplicity here.
Below, pre-scheduling device 601 will be described in detail.As mentioned below, pre-scheduling device 601 can be realized with various ways.
Fig. 8 shows the first example arrangement of pre-scheduling device 601.As shown in Figure 8, pre-scheduling device 601 comprises computing unit 6011 and determining unit 6012.Computing unit 6011 can calculate the performance loss of the Serving cell when the one or more frequency subbands of Serving cell in described frequency subband are closed.As described above, computing unit 6011 can calculate the performance loss of the Serving cell when Serving cell is closed on each frequency subband, also can calculate the performance loss of the Serving cell when Serving cell is closed on two or more frequency subbands simultaneously.Whether determining unit 6012 can exceed loss threshold value according to this performance loss, determines the on off state of Serving cell on described one or more frequency subband.Computing unit 6011 and determining unit 6012 can perform respective operation according to the method described with reference to Fig. 3 hereinbefore, omit it here describe in detail in order to avoid repetition.
Fig. 9 shows the second example arrangement of pre-scheduling device 601.As shown in Figure 9, pre-scheduling device 601 comprises pre-scheduling unit 6011 ', communication unit 6012 ' and determining unit 6013 '.
Pre-scheduling unit 6011 ' can carry out pre-scheduling to each frequency subband, to determine the user distributing to this frequency subband.In addition, pre-scheduling unit 6011 ' can also determine whether the user distributing to each frequency subband is edge customer.Pre-scheduling unit 6011 ' can perform pre-scheduling according to the mode described with reference to Fig. 4 hereinbefore and determines edge customer, omits it here and describes in detail.
When communication unit 6012 ' can be edge customer the user distributing to this frequency subband, the cooperation cell of this edge customer is sent request to the turn-off request of closing on this frequency subband described cooperation cell.In addition, communication unit 6012 ' can also receive from neighbor cell, the turn-off request of asking described community to be closed on this frequency subband.Communication unit 6012 ' can send described turn-off request by back haul link and receive the turn-off request sent from neighbor cell to cooperation cell.Equally, if described user is not edge customer, then communication unit 6012 ' can not perform above-mentioned transmit operation.
Determining unit 6013 ' according to the quantity of turn-off request sent and the quantity of the turn-off request of reception, can determine the on off state of Serving cell on this frequency subband.Such as, when for certain frequency subband, when the difference of the quantity of the quantity of the turn-off request received and the turn-off request of transmission is greater than predetermined amount threshold, determining unit 6013 ' can determine that described Serving cell is closed on this frequency subband.Determining unit 6013 ' can determine the on off state of described community according to the mode described with reference to Fig. 4 hereinbefore, here repeat no more.In addition, can described amount threshold be set according to mode mentioned above.
Figure 10 shows the third example arrangement of pre-scheduling device 601.As shown in Figure 10, pre-scheduling device 601 comprises pre-scheduling unit 6011 ' ', communication unit 6012 ' ' and determining unit 6013 ' '.
Identical with the pre-scheduling unit 6011 ' shown in Fig. 9, pre-scheduling unit 6011 ' ' pre-scheduling can be carried out to determine to distribute to the user of this frequency subband to each frequency subband.In addition, pre-scheduling unit 6011 ' ' can also determine whether the user distributing to each frequency subband is edge customer.
Communication unit 6012 ' can be edge customer when the user distributing to frequency subband, the first information is sent to the cooperation cell of this edge customer, this first information indicates the performance gain will brought to Serving cell when described cooperation cell is closed in this frequency resource, as described above.In addition, communication unit 6012 ' ' the second information from neighbor cell, the performance gain that the instruction of this second information will bring to described neighbor cell when Serving cell is closed on this frequency subband can also be received.
Determining unit 6013 ' ' according to the first information and the second information, the on off state of described Serving cell on this frequency subband can be determined.Such as, when for certain frequency subband, when the performance gain of first information instruction is less than the performance gain of the second information instruction, described determining unit 6013 ' ' determine that described Serving cell is closed on this frequency subband.Determining unit 6013 ' ' on off state of described Serving cell on frequency subband can be determined according to the mode described with reference to Fig. 5 hereinbefore, omit its detailed description for the sake of simplicity here.
By the dispatching method for community according to the above embodiment of the present invention and controlling equipment, can dispatch with the very short time interval (such as 1ms), and the channel condition information that can consider when operation dispatching from user feedback, because described channel condition information can reflect the dynamic change of wireless environment, therefore, use the scheduling result obtained according to dispatching method and the controlling equipment of the embodiment of the present invention can be adapted to the change of wireless environment better, thus improve systematic function.
In addition, above-mentioned scheduler can pass through hardware implementation, also can be implemented by the software module performed by processor, also can be implemented by both combinations.Software module also can be arranged on RAM(random access memory), flash memory, ROM(read-only memory), EPROM(erasable programmable ROM), EEPROM(electric erasable and programming ROM), register, hard disk, the arbitrary form such as removable dish or CD-ROM storage medium in.This storage medium is connected to processor, makes this processor can to this storage medium reading writing information.In addition, this storage medium also can be integrated into processor.In addition, this storage medium and processor also can be arranged in application-specific integrated circuit (ASIC) (ASIC).This ASIC also can be arranged in above-mentioned control unit or wireless base station eNB.In addition, this storage medium and processor also can be arranged on as discrete component in above-mentioned control unit or wireless base station eNB.
Although illustrate and described example embodiment of the present invention, those skilled in the art are to be understood that, when not deviating from the scope and spirit of the present invention limited in claim and equivalent thereof, the change in various forms and details can be made to these example embodiment.
Claims (16)
1., for a dispatching method for community, comprising:
Determine the on off state of described community in multiple frequency resource;
The on off state in the described multiple frequency resource of each leisure is exchanged with the neighbor cell of described community; And
Multiple channel condition information and the described neighbor cell on off state in described multiple frequency resource based on the user feedback of described community is dispatched.
2. the method for claim 1, wherein determine that the on off state of described community in multiple frequency resource comprises:
Calculate the performance loss of the community when the one or more frequency resources of described community in described multiple frequency resource are closed;
Whether exceed loss threshold value according to described performance loss, determine the on off state of described community in described one or more frequency resource.
3. the method for claim 1, wherein determine that the on off state of described community in multiple frequency resource comprises:
Pre-scheduling is carried out to determine to distribute to the user of this frequency resource to each frequency resource;
If the user distributing to this frequency resource is edge customer, then the cooperation cell of this edge customer is sent request to the turn-off request of closing in this frequency resource described cooperation cell;
Receive from neighbor cell, the turn-off request of asking described community to be closed in this frequency resource; And
According to the quantity of turn-off request of transmission and the quantity of the turn-off request of reception, determine the on off state of described community in this frequency resource.
4. method as claimed in claim 3, wherein, when for certain frequency resource, when the difference of the quantity of the quantity of the turn-off request of described reception and the turn-off request of transmission is greater than amount threshold, determines that described community is closed in this frequency resource.
5. the method for claim 1, wherein determine that the on off state of described community in multiple frequency resource comprises:
Pre-scheduling is carried out to determine to distribute to the user of this frequency resource to each frequency resource;
If the user distributing to this frequency resource is edge customer, then the first information is sent to the cooperation cell of this edge customer, the performance gain that the instruction of this first information will bring to described community when described cooperation cell is closed in this frequency resource;
Receive the second information from neighbor cell, the performance gain that the instruction of this second information will bring to described neighbor cell when described community is closed in this frequency resource; And
According to the first information and the second information, determine the on off state of described community in this frequency resource.
6. method as claimed in claim 5, wherein, when for certain frequency resource, when the performance gain of first information instruction is less than the performance gain of the second information instruction, determines that described community is closed in this frequency resource.
7. the method as described in one of claim 1 to 6, wherein, the multiple channel condition information of the user feedback of described community comprises channel condition information corresponding from the different on off states of described community and described neighbor cell respectively.
8. the method as described in one of claim 1 to 6, wherein, multiple channel condition information and the described neighbor cell on off state in described multiple frequency resource based on the user feedback of described community carries out scheduling and comprises:
For each frequency resource, from described multiple channel condition information, select the channel condition information corresponding with the on off state of described neighbor cell; And
Dispatch based on selected channel condition information.
9., for a controlling equipment for community, comprising:
Pre-scheduling device, is configured to determine the on off state of described community in multiple frequency resource;
Communicator, is configured to exchange the on off state in the described multiple frequency resource of each leisure with the neighbor cell of described community; And
Dispatching device, multiple channel condition information and the described neighbor cell on off state in described multiple frequency resource be configured to based on the user feedback of described community is dispatched.
10. equipment as claimed in claim 9, wherein, described pre-scheduling device comprises:
Computing unit, is configured to the performance loss calculating the community when the one or more frequency resources of described community in described frequency resource are closed;
Determining unit, is configured to whether exceed loss threshold value according to this performance loss, determines the on off state of described community in described one or more frequency resource.
11. equipment as claimed in claim 9, wherein, described pre-scheduling device comprises:
Pre-scheduling unit, is configured to carry out pre-scheduling to determine to distribute to the user of this frequency resource to each frequency resource;
Communication unit, if the user being configured to distribute to this frequency resource is edge customer, then the cooperation cell of this edge customer is sent request to the turn-off request of closing in this frequency resource described cooperation cell, and be configured to receive from neighbor cell, the turn-off request of asking described community to be closed in this frequency resource; And
Determining unit, is configured to the quantity according to the quantity of turn-off request sent and the turn-off request of reception, determines the on off state of described community in this frequency resource.
12. equipment as claimed in claim 11, wherein, when for certain frequency resource, when the difference of the quantity of the quantity of the turn-off request of described reception and the turn-off request of transmission is greater than amount threshold, described determining unit determines that described community is closed in this frequency resource.
13. equipment as claimed in claim 9, wherein, described pre-scheduling device comprises:
Pre-scheduling unit, is configured to carry out pre-scheduling to determine to distribute to the user of this frequency resource to each frequency resource;
Communication unit, if the user being configured to distribute to this frequency resource is edge customer, then the first information is sent to the cooperation cell of this edge customer, the performance gain that the instruction of this first information will bring to described community when described cooperation cell is closed in this frequency resource, and it is also configured to receive the second information from neighbor cell, the performance gain that the instruction of this second information will bring to described neighbor cell when described community is closed in this frequency resource; And
Determining unit, is configured to, according to the first information and the second information, determine the on off state of described community in this frequency resource.
14. equipment as claimed in claim 13, wherein, when for certain frequency resource, when the performance gain of first information instruction is less than the performance gain of the second information instruction, described determining unit determines that described community is closed in this frequency resource.
15. equipment as described in one of claim 9 to 14, wherein, the multiple channel condition information of the user feedback of described community comprises channel condition information corresponding from the different on off states of described community and described neighbor cell respectively.
16. equipment as described in one of claim 9 to 14, wherein, described dispatching device comprises:
Selected cell, is configured to for each frequency resource, from described multiple channel condition information, select the channel condition information corresponding with the on off state of described neighbor cell; And
Scheduling unit, is configured to dispatch based on selected channel condition information.
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| CN201310227420.9A CN104244429B (en) | 2013-06-08 | 2013-06-08 | Dispatching method and controlling equipment for cell |
| JP2014117801A JP6404000B2 (en) | 2013-06-08 | 2014-06-06 | Scheduling method and scheduling device for cell |
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| JP6404000B2 (en) | 2018-10-10 |
| JP2014239439A (en) | 2014-12-18 |
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