CN102572844A - Method and device for distributing cell resources - Google Patents
Method and device for distributing cell resources Download PDFInfo
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- CN102572844A CN102572844A CN2010106095666A CN201010609566A CN102572844A CN 102572844 A CN102572844 A CN 102572844A CN 2010106095666 A CN2010106095666 A CN 2010106095666A CN 201010609566 A CN201010609566 A CN 201010609566A CN 102572844 A CN102572844 A CN 102572844A
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Abstract
The invention discloses a method and a device for distributing cell resources. The method includes that a home position of a user terminal in a main service cell is determined; if the home position of the user terminal is a cell edge position, subcarrier is selected to be distributed by the user terminal according to a sequence of a subcarrier group preferentially used by edge users, a subcarrier group used in mixed mode and a subcarrier group preferentially used by central users; and if the home position of the user terminal is a cell central position, a subcarrier is selected for the user terminal to be distributed according to a sequence of a subcarrier group preferentially used by the central users, a subcarrier group used in mixed mode and a subcarrier group preferentially used by edge users. Co-channel interference and frequency resource waste are effectively avoided by distributing subcarrier resources dynamically, and whole throughput volume of the cell is improved as much as possible.
Description
Technical field
The present invention relates to communication technical field, refer to a kind of local resource distribution method and device that is applicable to cordless communication network especially.
Background technology
Continuous development along with mobile communication technology; The user has higher requirement to the content and the quality of mobile communication; Therefore obtain higher data rate and quality services (Quality of Service; QoS) guarantee, reach the first-selection that LTE system that high spectrum efficiency and lower operation cost be target becomes future broadband wireless communication systems naturally.
Physical layer adopts the access technology based on the OFDM technology in the LTE system, is that a plurality of rate data streams are transmitted on mutually orthogonal subcarrier with a high-speed data-flow through serial to parallel conversion.Because the frequency that the user uses in the sub-district is mutually orthogonal, does not exist interference interfering with each other, all to come from other sub-districts between the user in the sub-district, i.e. the interference of minizone.In order to pursue higher transmission rate, the LTE system uses bigger system bandwidth usually, just can not weaken the minizone in this case through the traditional frequency multiplexing method that uses higher reuse with disturbing frequently.
In order to solve the problem in the cell edge serious interference that causes owing to presence of intercell interference in the LTE system, 3GPP has proposed multiple solution, comprises interference randomization, interference eliminated and interference coordination technique.Wherein the statistical property of interference randomization utilization interference suppresses interference, and error is bigger.Interference cancellation techniques utilizes the processing gain of receiver from receive signal, to eliminate interference components, and to having relatively high expectations synchronously of minizone, the receiver complexity is bigger, owing to realize that complicacy is unfavorable for applying.The core concept of interference coordination technique is to adopt the channeling technology, and it makes that the distance of the interference signal source between the neighbor cell is far away as far as possible, thereby suppresses interference among adjacent cells.It is realized simple relatively and for interference the better inhibited effect is arranged, becomes the focus of present industry research.
Interference coordination technique commonly used is at present mainly used static and semi-static method is carried out Inter-Cell Interference Coordination, mainly is based on improving one's methods of partial frequency multiplexing, soft-frequency reuse.
The basic principle of partial frequency multiplexing is: for the user of center of housing estate and cell edge distributes on the sub-carrier set of the multiplexing factor of different frequency.Though this mode is simple, strict to the use restriction of subcarrier, though, sacrificed flexibility and spectrum efficiency that subcarrier uses for having played good inhibitory effect with disturbing frequently.One type of user in Cell Edge User and Cell Center User is more, and another kind of user can cause the concentrated subcarrier of a number of sub-carrier not enough, and the subcarrier in another sub-carrier set is idle, thereby is had a strong impact on the overall throughput of sub-district more after a little while.
Subcarrier with all frequency ranges in soft-frequency reuse is divided into two groups of subcarriers: boss's carrier wave and auxilliary subcarrier.Boss's carrier wave can be in the use Anywhere of sub-district, and auxilliary subcarrier then can only be used at center of housing estate.User according to the residing place-centric of user position can use all subcarriers, and the user of marginal position can only use boss's carrier wave.This mode is many when the Cell Edge User number, business demand is big, and the central user business demand hour can take place that the part edge user can't insert and the remaining situation of auxilliary subcarrier of central area user use, thereby has a strong impact on the overall throughput of sub-district.
Summary of the invention
The embodiment of the invention provides a kind of local resource distribution method and device, in order to problems such as the same frequency interference that solves cell carrier and power division existence in the prior art, frequency resource wastes.
A kind of local resource distribution method comprises:
Confirm the homing position of user terminal in main Serving cell;
If the homing position of user terminal is the cell edge position, be that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of central user;
If the homing position of user terminal is the center of housing estate position, be that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of edge customer.
A kind of local resource distributor comprises:
Position determination module is used for confirming the homing position of user terminal at main Serving cell;
First distribution module; Being used for if said position determination module confirms that the homing position of user terminal is the cell edge position, is that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of central user;
Second distribution module; Being used for if said position determination module confirms that the homing position of user terminal is the center of housing estate position, is that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of edge customer.
A kind of base station comprises: above-mentioned local resource distributor.
Beneficial effect of the present invention is following:
Local resource distribution method and device that the embodiment of the invention provides; Available subcarrier in the sub-district is divided into groups; User terminal to different homing positions; Adopting the different subcarriers allocation rule, is the user terminal of cell edge position to homing position, is that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of central user; To homing position is the user terminal of center of housing estate position, is that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of edge customer.Thereby realized the dynamic assignment of sub-carrier resources; Effectively avoided with disturbing frequently and the frequency resource waste; Also avoided effectively more also can having the idle possibility of parton carrier resource, improved the overall throughput of sub-district as much as possible at number of users.
Description of drawings
Fig. 1 is the flow chart of local resource distribution method in the embodiment of the invention;
Fig. 2 is the sketch map that the sub-district sub-carriers is divided into groups in the embodiment of the invention;
Fig. 3 is a Cell Edge User subcarrier allocation sketch map in the embodiment of the invention;
Subcarrier allocation sketch map when Fig. 4 increases for Cell Edge User in the embodiment of the invention;
Subcarrier allocation sketch map when Fig. 5 further increases for Cell Edge User in the embodiment of the invention;
Fig. 6 is a Cell Center User subcarrier allocation sketch map in the embodiment of the invention;
Fig. 7 is the structural representation of local resource distributor in the embodiment of the invention.
Embodiment
Divide timing to sub-district carrier resource in the prior art, adopt frequency multiplexing mode to carry out Inter-Cell Interference Coordination, very flexible, the frequency efficiency of existence are low; Some problems such as assigning process complicacy; A kind of local resource distribution method that the embodiment of the invention provides is user's distributing carrier wave and power resource according to user residing position in the sub-district, to reduce with disturbing frequently and the frequency resource waste; The flow process of the inventive method is as shown in Figure 1, specifically comprises following implementation procedure:
At first, all subcarriers of sub-district are divided into groups, and it is regular with the central user subcarrier allocation that edge customer subcarrier allocation rule is set.
All available subcarriers of sub-district are divided into three groups, and are labeled as the sub carrier group of the preferential sub carrier group of using of central user, the preferential use of edge customer, the sub carrier group that the center and peripheral user mixes use (be called for short and mix the sub carrier group of using) respectively.
Preferably; In order better to avoid the interference between the neighbor cell; When the available subcarrier in the sub-district is divided into groups; The sub-carrier frequencies that the sub-carrier frequencies that each groups of subcarriers comprised that will mark off the as much as possible subcarrier corresponding with neighbor cell divides into groups to be comprised staggers, and the sub-carrier frequencies that the same sub-carrier group of neighbor cell is comprised is different.
For example: the principle schematic that the subcarrier in the sub-district is divided into groups that is as shown in Figure 2.Wherein, The preferential subcarrier that uses of edge customer among the CELL1 of sub-district divides into groups to take 1/3 subcarrier of low frequency one end; The preferential subcarrier that uses of central user divides into groups to take 1/3 subcarrier of high-frequency one end, mixes 1/3 the subcarrier that the sub carrier group of using takies remaining mid portion; Sub-district CELL2 then is 1/3 the subcarrier that the preferential sub carrier group of using of central user takies low frequency one end; The subcarrier that mix to use divides into groups to take 1/3 subcarrier of high-frequency one end, and the preferential subcarrier that uses of edge customer divides into groups to take 1/3 subcarrier of remaining mid portion; Sub-district CELL3 then is 1/3 the subcarrier that the subcarrier that mix to use divides into groups to take low frequency one end; The preferential sub carrier group of using of edge customer takies 1/3 subcarrier of high-frequency one end, and the preferential subcarrier that uses of central user divides into groups to take 1/3 subcarrier of remaining mid portion.The frequency of the subcarrier of Cell Edge User, Cell Center User priority allocation then can be not identical in the neighbor cell like this, thus big to the greatest extent possible having avoided with disturbing frequently.Certainly; Above-mentioned only be subcarrier divide into groups for example; Can not adopt in the practical application in such a way and divide into groups; As long as make Cell Edge User preferentially use the frequency of sub carrier group and the preferential sub carrier group of using of Cell Center User not intersect as far as possible, realize optimizing subcarrier and divide into groups to avoid as far as possible purpose to get final product with disturbing frequently.
After available subcarrier in the sub-district divided into groups, corresponding setting edge customer subcarrier allocation rule was regular with the central user subcarrier allocation.
Edge customer subcarrier allocation rule comprises: the selective sequential subcarrier according to the preferential sub carrier group of using of edge customer, the sub carrier group of mixing use, the preferential sub carrier group of using of central user is the user terminal allocation of subcarriers of homing position as the cell edge position.Specifically comprise: for homing position is the subcarrier during the preferential subcarrier that uses of user terminal priority allocation edge customer of cell edge position divides into groups; After subcarrier allocation during the subcarrier of user priority use divides into groups on the edge of is intact; For homing position is the subcarrier during subcarrier that the user terminal of cell edge position distribute to mix uses divides into groups; The subcarrier that uses of user priority divides into groups and mixes after the subcarrier of the subcarrier that uses in dividing into groups all distribute on the edge of, is the subcarrier in the sub carrier group used of the user terminal distributing center user priority of cell edge position for homing position.
The allocation rule of central user subcarrier allocation rule comprises: the order of the sub carrier group that sub carrier group, the sub carrier group of mixing use, the edge customer that preferentially uses according to central user preferentially uses is the Cell Edge User allocation of subcarriers.Specifically comprise: for homing position is the subcarrier during the preferential subcarrier that uses of user terminal priority allocation central user of center of housing estate position divides into groups; After subcarrier allocation in the preferential subcarrier that uses of central user divides into groups is intact; For homing position is the subcarrier during subcarrier that the user terminal of center of housing estate position distribute to mix uses divides into groups; Dividing into groups and mix after the subcarrier of the subcarrier that uses in dividing into groups all distribute at the preferential subcarrier that uses of central user, is the subcarrier in the sub carrier group used of the user terminal allocations of edge user priority of center of housing estate position for homing position.
Comprise the steps: for the detailed process of user terminal allocation of subcarriers in back that subcarrier is divided into groups
Step S11: confirm the homing position of user terminal in main Serving cell.
Obtain user terminal measurement to first signal strength signal intensity and the signal strength signal intensity of main Serving cell be only second to the secondary signal intensity of time strong Serving cell of main Serving cell; Whether less than the strength threshold value of setting, the homing position of confirming user terminal is the cell edge position or the center of housing estate position of main Serving cell according to the difference of first signal strength signal intensity and secondary signal intensity.Be specially when difference during less than the strength threshold value set, the homing position of confirming user terminal is the cell edge position, otherwise the homing position of confirming user terminal is the center of housing estate position.
The signal strength signal intensity of user terminal measurement generally is meant reference signal (Reference Signal, RS) signal power strength.
The RS signal power strength of the main Serving cell that user terminal measurement receives reaches time RS signal power strength of strong Serving cell, and this information is sent to the base station.After the main Serving cell that the base station gets access to user terminal to send up and time RS signal power strength of strong Serving cell; The RS signal power strength of calculating these two sub-districts is poor; If less than predefined strength threshold value; Judge that then this homing position that is used for the terminal is the cell edge position, promptly this user is an edge customer.The homing position of above-mentioned user terminal is the cell edge position; Comprise that not only the geographical position of user terminal in the sub-district is positioned at the edge of sub-district; Be in the center of sub-district though also comprise the geographical position of user terminal, because the more weak situation of useful signal that channel fading or communication environments complicacy cause user terminal to receive.This decision procedure is not only applicable to the judgement of the hexagon honeycomb residence user terminal attaching position of rule, judges for the user terminal homing position in the sub-district of judging irregular topology structure in the real network to have more practical significance.
Step S12: the homing position of user terminal is cell edge position or center of housing estate position.
If cell edge position execution in step S13; If center of housing estate position execution in step S17.
Step S13: the edge customer subcarrier allocation rule according to setting is the user terminal allocation of subcarriers.
When the homing position of user terminal is the cell edge position, be the user terminal allocation of subcarriers according to the edge customer subcarrier allocation rule of setting.Promptly when allocation of subcarriers, distribute as user terminal according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the sub carrier group that central user is preferentially used.
Number of users is not for a long time on the edge of; Be specially the needed number of subcarriers of user terminal under the edge customer when being not more than the number of subcarriers in the preferential sub carrier group of using of edge customer; For homing position is the subcarrier in the sub carrier group used of the user terminal allocations of edge user priority of marginal position; In a minute timing, distribute as user terminal by the subcarrier that hangs down in the preferential sub carrier group of using of paramount selective sequential edge customer according to frequency.Be illustrated in figure 3 as Cell Edge User subcarrier allocation sketch map, the part that Fig. 3 bend is filled is the subcarrier that distributes use, the arrow logo subcarrier allocation frequency choice direction that oblique line is filled.
Under above-mentioned preferred subcarrier grouping situation shown in Figure 3; Because the subcarrier of the preferential sub carrier group of using of the edge customer of neighbor cell staggers; Therefore; When the edge customer negligible amounts of CELL1, CELL2, CELL3 in the sub-district, required sub-carrier number are not more than the number of subcarriers in the preferential sub carrier group of using of edge customer, the subcarrier that the edge customer of neighbor cell can frequency of utilization staggers fully; What use like the edge customer among the CELL1 of sub-district is 1/3rd subcarrier part of low frequency one end; What the edge customer of sub-district CELL2 used is the subcarrier of mid portion 1/3rd, and the edge customer of sub-district CELL3 uses is 1/3rd subcarrier of high-frequency one end, thereby reduces greatly with disturbing frequently.
When Cell Edge User quantity increases; Be specially the affiliated needed number of subcarriers of user terminal of edge customer greater than the number of subcarriers in the preferential sub carrier group of using of edge customer; But less than the preferential sub carrier group of using of edge customer during with the number of subcarriers sum of mixing in the sub carrier group of using, begin for homing position be that the user terminal of marginal position distributes the subcarrier that mixes in the sub carrier group of using.In a minute timing; Be that user terminal distributes according to frequency by the subcarrier that hangs down in the preferential sub carrier group of using of paramount selective sequential edge customer earlier, and then the subcarrier that mixes in the sub carrier group of using according to frequency selective sequential from high to low distribute as user terminal.Subcarrier allocation sketch map when being illustrated in figure 4 as the increase of Cell Edge User quantity, the part that Fig. 4 bend is filled is the subcarrier that distributes use, the arrow logo subcarrier allocation frequency choice direction that oblique line is filled.
Under above-mentioned preferred subcarrier grouping situation shown in Figure 4; The edge customer quantity of (for example sub-district CELL1) more for a long time a sub-district; Distribute after the subcarrier in the preferential sub carrier group of using of edge customer, begin to distribute the subcarrier that mixes in the sub carrier group of using to use to edge customer.When at this moment the chooser allocation of carriers is given edge customer in mixing the sub carrier group of using, distribute to low-frequency selective sequential subcarrier from the high-frequency of this sub carrier group.Edge customer in neighbor cell CELL2 more still can make the sub-carrier frequencies of the edge customer use of different districts stagger as much as possible like this, thereby the same frequency that alleviates the minizone to the full extent disturbs.
When Cell Edge User quantity further increases; Be specially the needed number of subcarriers of user terminal under the edge customer greater than the preferential sub carrier group of using of edge customer during with the number of subcarriers sum of mixing in the sub carrier group of using, begin for homing position be the subcarrier in the sub carrier group used of the user terminal distributing center user priority of marginal position.In a minute timing; Distribute as user terminal by the subcarrier that hangs down in the preferential sub carrier group of using of paramount selective sequential edge customer according to frequency earlier; The subcarrier that mixes in the sub carrier group use according to frequency selective sequential from high to low again distributes as user terminal, and then the subcarrier in the sub carrier group of preferentially using according to frequency selective sequential central user from high to low distributes as user terminal.Subcarrier allocation sketch map when being illustrated in figure 5 as Cell Edge User quantity and further increasing, the part that Fig. 5 bend is filled is the subcarrier that distributes use, the arrow logo subcarrier allocation frequency choice direction that oblique line is filled.
Under above-mentioned preferred subcarrier grouping situation shown in Figure 5; When the edge customer quantity of (for example sub-district CELL1) is a lot of a sub-district; Distribute after the preferential sub carrier group of using of edge customer and the subcarrier that mixes in the sub carrier group of using, the subcarrier in the sub carrier group that beginning distributing center user priority uses uses to edge customer.When at this moment the chooser allocation of carriers is given edge customer in the preferential sub carrier group of using of central user, distribute to low-frequency selective sequential subcarrier from the high-frequency of this sub carrier group.Edge customer in neighbor cell CELL3 more still can make the sub-carrier frequencies of the edge customer use of different districts stagger as much as possible like this, thereby the same frequency that alleviates the minizone to the full extent disturbs.
It is thus clear that; Among the present invention when for homing position being user terminal (or saying Cell Edge User) allocation of subcarriers of cell edge position; Preferably; By the subcarrier in the low paramount preferential sub carrier group of using of selective sequential edge customer, mix the subcarrier in the sub carrier group of using according to frequency according to frequency selective sequential from high to low, and according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential central user from high to low; For homing position is the said user terminal distribution of cell edge position, disturb to realize the same frequency that farthest alleviates the minizone.
Preferably; When the angelica position is the needed number of subcarriers of the user terminal of cell edge position greater than the number of subcarriers in the preferential sub carrier group of using of institute's edge customer; Confirm that homing position is the User Priority of the user terminal of cell edge position, be preferably the subcarrier in the sub carrier group that the high user terminal allocations of edge user priority of User Priority uses.
For example; Can sort to Cell Edge User according to situation such as desired QoS grade of Cell Edge User and rate requirement; Guarantee that the high Cell Edge User of priority at first is assigned to the subcarrier in the preferential sub carrier group of using of edge customer, thereby make the high edge customer of priority obtain better channel quality.
Step S14: the central user subcarrier allocation rule according to setting is the user terminal allocation of subcarriers.
When the homing position of user terminal is the center of housing estate position, be the user terminal allocation of subcarriers according to the central user subcarrier allocation rule of setting.Promptly when allocation of subcarriers, distribute as user terminal according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the sub carrier group that edge customer preferentially uses.
Implementation procedure and the above-mentioned steps S13 that for homing position is the user terminal allocation of subcarriers of center of housing estate position is that homing position is that the realization principle of user terminal allocation of subcarriers of cell edge position is similar; During reallocation; Preferably; According to frequency by the subcarrier in the low paramount preferential sub carrier group of using of selective sequential central user; Mix the subcarrier in the sub carrier group of using according to frequency by hanging down paramount selective sequential, and, be the user terminal distribution of center of housing estate position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential edge customer from high to low.
Further preferred; When the angelica position is the needed number of subcarriers of the user terminal of center of housing estate position greater than the number of subcarriers in the preferential sub carrier group of using of central user; Confirm that homing position is the User Priority of the user terminal of center of housing estate position, be preferably the subcarrier in the sub carrier group that the high user terminal distributing center user priority of User Priority uses.
For example; Can sort to Cell Center User according to situation such as desired QoS grade of Cell Center User and rate requirement; Guarantee that the high Cell Center User of priority at first is assigned to the subcarrier in the preferential sub carrier group of using of central user; Thereby make central user obtain better channel quality, simultaneously also the sub-carrier frequencies with the edge customer of neighbor cell is different as much as possible.
The Cell Center User subcarrier allocation sketch map that is shown in Figure 6, the part that horizontal line is filled among Fig. 6 is the subcarrier that distributes use, the arrow logo subcarrier allocation frequency choice direction that horizontal line is filled.Similar with the distribution principle that the subcarrier allocation of edge customer is complementary; As the center user; Be that homing position is the user terminal negligible amounts of center of housing estate position; When for example the needed number of subcarriers of the central user among CELL1, CELL2, the CELL3 is less than the number of subcarriers in the preferential sub carrier group of using of central user among Fig. 6, give central user by the subcarrier that hangs down in the preferential sub carrier group of using of paramount order assignment central user according to frequency; When the center user increases the number of subcarriers to the sub carrier group that needed number of subcarriers is preferentially used greater than central user; When for example the central user quantity among the CELL1 increases, begin to distribute the subcarrier that mixes in the sub carrier group of using for central user; When the center user further increases the number of subcarriers sum to the sub carrier group that needed number of subcarriers is used greater than the sub carrier group and the mixing of the preferential use of central user; When for example the further central user quantity among the CELL1 increases, the subcarrier in the sub carrier group that just begins to use for central user allocations of edge user priority.
Realize being that the different user terminal of homing position distributes the subcarrier in the sub carrier group corresponding with its homing position in the sub-district in the sub-district as much as possible through step S13 and step S14.
Use above-mentioned sub-carrier wave distribution method; When occurring under the very unbalanced situation of cell edge and center of housing estate traffic carrying capacity; Cell Edge User can first-selectedly use the subcarrier in the preferential sub carrier group of using of Cell Edge User; Inferior choosing mixes the subcarrier in the sub carrier group of using, and when Cell Center User preferentially uses subcarrier in the sub carrier group that residue is arranged, also can hold over Cell Center User and preferentially use the subcarrier in the sub carrier group.And the center of housing estate traffic carrying capacity is when big; Cell Center User can first-selectedly use the subcarrier in the preferential sub carrier group of using of Cell Center User; Inferior choosing mixes the subcarrier in the sub carrier group of using, and takies the subcarrier in the preferential sub carrier group of using of part Cell Edge User at last.Thereby the dynamic coordinate that can reach sub-carrier resources distributes, and has also avoided the same frequency between the user of neighbor cell to disturb as far as possible.
Preferably, the above-mentioned local resource distribution method that the embodiment of the invention provides also comprises: according to the homing position of user terminal in main Serving cell is that user terminal distributes power resource.Homing position according to user terminal is that user terminal distributes the process of transmitting power specifically to comprise: execution in step S15 after step S13, execution in step S16 after step S14.
Wherein the execution sequence of step S13 and step S15 can exchange, and the execution sequence of step S14 and step S16 can exchange.
Step S15: for user terminal distributes more than or equal to the power of setting first power threshold.
Be the transmitting power of the user terminal distribution of cell edge position just more than or equal to first power threshold of setting for homing position.The user terminal that is embodied as the cell edge position through first power threshold that is provided with distributes a bigger transmitting power.
Step S16: for user terminal distributes smaller or equal to the power of setting second power threshold.
Be the transmitting power of the user terminal distribution of center of housing estate position just smaller or equal to second power threshold of setting for homing position.
Preferably, second power threshold of setting is smaller or equal to first power threshold, and the user terminal that is embodied as the cell edge position through second power threshold that is provided with distributes a less transmitting power.
Be embodied as the different different big or small transmitting powers of user terminal distribution of homing position in the sub-district through step S13 and step S14; Thereby make that homing position is that the user terminal of cell edge position can use bigger power; Homing position is that the user of center of housing estate position then uses less power; Thereby further avoided with the generation of interference frequently, the same frequency that has especially reduced between the edge customer disturbs, and can further improve the throughput of Cell Edge User.
Preferably, to take subcarrier in the sub carrier group that sub carrier group that mix to use or central user preferentially use, homing position is the user terminal of cell edge position, the mode of employing open Loop Power control is adjusted its transmitting power.When thereby subscriber traffic took more sub-carrier resources more greatly on the edge of, control and the maximum use of the possibility of regulate to take place disturbing mixed the transmitting power of the user terminal of the sub carrier group used or the subcarrier in the preferential sub carrier group of using of central user.
According to the local resource distribution method that the embodiment of the invention provides, can make up a kind of local resource distributor, this device can be provided with in the base station of LTE system, also the network equipment that other are used to user terminal allocation of subcarriers and power resource can be set.The structure of this device is as shown in Figure 7, comprising: position determination module 10, first distribution module 20 and second distribution module 30.
Position determination module 10 is used for confirming the homing position of user terminal at main Serving cell.
Preferably; Above-mentioned position determination module 10; Specifically be used for: obtain user terminal measurement to first signal strength signal intensity and the signal strength signal intensity of main Serving cell be only second to the secondary signal intensity of time strong Serving cell of main Serving cell; Whether less than the strength threshold value of setting, the homing position of confirming user terminal is the cell edge position or the center of housing estate position of main Serving cell according to the difference of first signal strength signal intensity and secondary signal intensity.
First distribution module 20; Be used for if position determination module 10 confirms that the homing position of user terminal is the cell edge position;, be that said user terminal distributes then according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of central user according to the edge customer subcarrier allocation rule of setting.
Preferably, above-mentioned first distribution module 20 specifically comprises: first assignment control 201 and second assignment control 202.
First assignment control 201; Be used for according to frequency by the subcarrier that hangs down the preferential sub carrier group of using of paramount selective sequential edge customer; Mix the subcarrier in the sub carrier group of using according to frequency selective sequential from high to low; And, be the said user terminal distribution of cell edge position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential central user from high to low.
Second assignment control 202; The needed number of subcarriers of user terminal that is used for the angelica position and is the cell edge position is during greater than the number of subcarriers of the preferential sub carrier group of using of said edge customer; Confirm that homing position is the User Priority of the user terminal of cell edge position, be preferably the subcarrier in the sub carrier group that the high user terminal allocations of edge user priority of User Priority uses.
Second distribution module 30; Be used for if said position determination module 10 confirms that the homing position of user terminal is the center of housing estate position;, be that said user terminal distributes then according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of edge customer according to the central user subcarrier allocation rule of setting.
Preferably, above-mentioned second distribution module 30 specifically comprises: the 3rd assignment control 301 and the 4th assignment control 302.
The 3rd assignment control 301; Be used for according to frequency by the subcarrier that hangs down the preferential sub carrier group of using of paramount selective sequential central user; Mix the subcarrier in the sub carrier group of using according to frequency by low paramount selective sequential; And, be the user terminal distribution of center of housing estate position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential edge customer from high to low.
The 4th assignment control 302; The needed number of subcarriers of user terminal that is used for the angelica position and is the center of housing estate position is during greater than the number of subcarriers of the preferential sub carrier group of using of central user; Confirm that homing position is the User Priority of the user terminal of center of housing estate position, be preferably the subcarrier in the sub carrier group that the high user terminal distributing center user priority of User Priority uses.
Preferable; Above-mentioned local resource distributor; Also comprise: preset value module 40, be used for all subcarriers of sub-district are divided into groups, be divided into the preferential sub carrier group of using of edge customer, the preferential sub carrier group of using of central user and mix the sub carrier group of using; And it is regular with the central user subcarrier allocation that edge customer subcarrier allocation rule is set.
Preferable; Above-mentioned local resource distributor; Also comprise: power division module 50; The homing position that is used for according to user terminal is that user terminal distributes transmitting power, specifically comprises: for homing position is the transmitting power of the user terminal distribution of cell edge position more than or equal to first power threshold of setting; For homing position is the transmitting power of the user terminal distribution of center of housing estate position smaller or equal to second power threshold of setting.
Preferably; Above-mentioned power division module 50; Also be used for: to the subcarrier that takies the sub carrier group that sub carrier group that mix to use or central user preferentially use, homing position is the user terminal of cell edge position, the mode of employing open Loop Power control is adjusted its transmitting power.
Local resource distribution method and device that the embodiment of the invention provides; Available subcarrier in the sub-district is divided into groups; User terminal to different homing positions; Adopting the different subcarriers allocation rule, is the user terminal of cell edge position to homing position, distributes as user terminal according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the sub carrier group that central user is preferentially used; To homing position is the user terminal of center of housing estate position, distributes as user terminal according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the sub carrier group that edge customer preferentially uses.Thereby realized the dynamic assignment of sub-carrier resources; Effectively avoided with disturbing frequently and the frequency resource waste; Also avoided effectively more also can having the idle possibility of parton carrier resource, improved the overall throughput of sub-district as much as possible at number of users.
In the said method to homing position is the user terminal of center of housing estate position with homing position is the cell edge position user terminal according to the subcarrier in the ready-portioned in advance sub carrier group of different rules selection that is provided with in advance; Selecting sequence when selecting subcarrier for use is different; Thereby at number of users more after a little while; Make that as much as possible the sub-carrier frequencies of using is different, when number of users increases, adopt certain choice mechanism; Begin the chooser carrier wave from the two ends of the sub carrier group of same frequency range, avoid the identical situation of frequency as much as possible.
In a minute timing; It is also conceivable that user's priority; Especially to the edge customer that is easier to disturb; Make the high user of priority who is had relatively high expectations in aspects such as QoS be assigned to the subcarrier in the preferential sub carrier group of using of edge customer as far as possible, reduce the possibility that the high user of this type priority disturbs.
The said method implementation procedure is simple, convenient, matches with the transmit power allocations of subcarrier, and the same frequency that can better reduce inter-cell user disturbs.Owing to adopt dynamic assignment and adjustment mechanism, improved the complexity that the availability of frequency spectrum is low and distribute, improve the performance of Cell Edge User.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1. a local resource distribution method is characterized in that, comprising:
Confirm the homing position of user terminal in main Serving cell;
If the homing position of user terminal is the cell edge position, be that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of central user;
If the homing position of user terminal is the center of housing estate position, be that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of edge customer.
2. the method for claim 1 is characterized in that, the position at the place of said definite user terminal in main Serving cell specifically comprises:
Obtain user terminal measurement to first signal strength signal intensity and the signal strength signal intensity of main Serving cell be only second to the secondary signal intensity of time strong Serving cell of main Serving cell; Whether less than the strength threshold value of setting, the homing position of confirming user terminal is the cell edge position or the center of housing estate position of main Serving cell according to the difference of first signal strength signal intensity and secondary signal intensity.
3. the method for claim 1 is characterized in that, also comprises for before the user terminal allocation of subcarriers:
All subcarriers in the sub-district are divided into groups, be divided into the preferential sub carrier group of using of edge customer, the preferential sub carrier group of using of central user and mix the sub carrier group of using; And
Edge customer subcarrier allocation rule and central user subcarrier allocation rule are set.
4. method as claimed in claim 3; It is characterized in that; When all subcarriers in the sub-district are divided into groups; The preferential sub carrier group of using of the edge customer that marks off, the preferential sub carrier group of using of central user and the frequency of mixing the subcarrier that comprises in the sub carrier group of using are different with the frequency of the corresponding sub carrier group of neighbor cell.
5. the method for claim 1; It is characterized in that; When the angelica position is the needed number of subcarriers of the user terminal of cell edge position greater than the number of subcarriers in the preferential sub carrier group of using of said edge customer; Confirm that homing position is the User Priority of the user terminal of cell edge position, be preferably the subcarrier in the sub carrier group that the high user terminal allocations of edge user priority of User Priority uses.
6. the method for claim 1; It is characterized in that; Said selective sequential subcarrier according to the preferential sub carrier group of using of edge customer, the sub carrier group of mixing use and the preferential sub carrier group of using of central user is that said user terminal distributes, and specifically comprises:
According to frequency by the subcarrier in the low paramount preferential sub carrier group of using of selective sequential edge customer; Mix the subcarrier in the sub carrier group of using according to frequency selective sequential from high to low; And, be the said user terminal distribution of cell edge position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential central user from high to low.
7. the method for claim 1; It is characterized in that; When the angelica position is the needed number of subcarriers of the user terminal of center of housing estate position greater than the number of subcarriers in the preferential sub carrier group of using of said central user; Confirm that homing position is the User Priority of the user terminal of center of housing estate position, be preferably the subcarrier in the sub carrier group that the high user terminal distributing center user priority of User Priority uses.
8. the method for claim 1; It is characterized in that; Said selective sequential subcarrier according to the preferential sub carrier group of using of central user, the sub carrier group of mixing use and the preferential sub carrier group of using of edge customer is that said user terminal distributes, and specifically comprises:
According to frequency by the subcarrier in the low paramount preferential sub carrier group of using of selective sequential central user; Mix the subcarrier in the sub carrier group of using according to frequency by low paramount selective sequential; And, be the said user terminal distribution of center of housing estate position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential edge customer from high to low.
9. like the arbitrary described method of claim 1-8, it is characterized in that, also comprise: the homing position according to user terminal is that user terminal distributes transmitting power, specifically comprises:
For homing position is the transmitting power of the user terminal distribution of cell edge position more than or equal to first power threshold of setting;
For homing position is the transmitting power of the user terminal distribution of center of housing estate position smaller or equal to second power threshold of setting.
10. like the arbitrary described method of claim 1-8; It is characterized in that; Also comprise: to take subcarrier in the sub carrier group that sub carrier group that mix to use or central user preferentially use, homing position is the user terminal of cell edge position, the mode of employing open Loop Power control is adjusted its transmitting power.
11. a local resource distributor is characterized in that, comprising:
Position determination module is used for confirming the homing position of user terminal at main Serving cell;
First distribution module; Being used for if said position determination module confirms that the homing position of user terminal is the cell edge position, is that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of edge customer, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of central user;
Second distribution module; Being used for if said position determination module confirms that the homing position of user terminal is the center of housing estate position, is that said user terminal distributes according to the sub carrier group of the preferential sub carrier group of using of central user, mixing use and the selective sequential subcarrier of the preferential sub carrier group of using of edge customer.
12. device as claimed in claim 11 is characterized in that, said position determination module specifically is used for:
Obtain user terminal measurement to first signal strength signal intensity and the signal strength signal intensity of main Serving cell be only second to the secondary signal intensity of time strong Serving cell of main Serving cell; Whether less than the strength threshold value of setting, the homing position of confirming user terminal is the cell edge position or the center of housing estate position of main Serving cell according to the difference of first signal strength signal intensity and secondary signal intensity.
13. device as claimed in claim 11 is characterized in that, also comprises:
The preset value module is used for all subcarriers of sub-district are divided into groups, and is divided into the preferential sub carrier group of using of edge customer, the preferential sub carrier group of using of central user and mixes the sub carrier group of using; And it is regular with the central user subcarrier allocation that edge customer subcarrier allocation rule is set.
14. device as claimed in claim 11 is characterized in that, said first distribution module specifically comprises:
First assignment control; Be used for according to frequency by the subcarrier that hangs down the preferential sub carrier group of using of paramount selective sequential edge customer; Mix the subcarrier in the sub carrier group of using according to frequency selective sequential from high to low; And, be the said user terminal distribution of cell edge position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential central user from high to low;
Second assignment control; The needed number of subcarriers of user terminal that is used for the angelica position and is the cell edge position is during greater than the number of subcarriers of the preferential sub carrier group of using of said edge customer; Confirm that homing position is the User Priority of the user terminal of cell edge position, be preferably the subcarrier in the sub carrier group that the high user terminal allocations of edge user priority of User Priority uses.
15. device as claimed in claim 11 is characterized in that, said second distribution module specifically comprises:
The 3rd assignment control; Be used for according to frequency by the subcarrier that hangs down the preferential sub carrier group of using of paramount selective sequential central user; Mix the subcarrier in the sub carrier group of using according to frequency by low paramount selective sequential; And, be the said user terminal distribution of center of housing estate position for homing position according to the subcarrier in the preferential sub carrier group of using of frequency selective sequential edge customer from high to low;
The 4th assignment control; The needed number of subcarriers of user terminal that is used for the angelica position and is the center of housing estate position is during greater than the number of subcarriers of the preferential sub carrier group of using of said central user; Confirm that homing position is the User Priority of the user terminal of center of housing estate position, be preferably the subcarrier in the sub carrier group that the high user terminal distributing center user priority of User Priority uses.
16. like the arbitrary described device of claim 11-15, it is characterized in that, also comprise:
The power division module, the homing position that is used for according to user terminal is that user terminal distributes transmitting power, specifically comprises:
For homing position is the transmitting power of the user terminal distribution of cell edge position more than or equal to first power threshold of setting; For homing position is the transmitting power of the user terminal distribution of center of housing estate position smaller or equal to second power threshold of setting.
17. device as claimed in claim 16 is characterized in that, said power division module also is used for:
To take subcarrier in the sub carrier group that sub carrier group that mix to use or central user preferentially use, homing position is the user terminal of cell edge position, the mode of employing open Loop Power control is adjusted its transmitting power.
18. a base station is characterized in that, comprising: like the arbitrary described local resource distributor of claim 11-17.
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| CN102572844B (en) | 2015-03-11 |
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