CN101742519B - Frequency resource allocation method and device - Google Patents
Frequency resource allocation method and device Download PDFInfo
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- CN101742519B CN101742519B CN 200810226072 CN200810226072A CN101742519B CN 101742519 B CN101742519 B CN 101742519B CN 200810226072 CN200810226072 CN 200810226072 CN 200810226072 A CN200810226072 A CN 200810226072A CN 101742519 B CN101742519 B CN 101742519B
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Abstract
The invention discloses a frequency resource allocation method and device, applied to the coverage constrained environment in mobile communication system. The method of the invention includes that users of each cell are divided into inner users and outer users; a first frequency band is allocated to the outer users of each cell and adjacent cells thereof; a second frequency band is allocated to the inner users of each cell and adjacent cells thereof; and the first frequency band and the second frequency band are the subsets of system frequency band and the intersection of the two is empty. The frequency resource allocation method and device provided by the invention solves the problem of intercell interference under the existing coverage constrained environment.
Description
Technical field
The present invention relates to mobile communication system, relate in particular to a kind of frequency resource allocation method and device.
Background technology
In that (Orthogonal Frequency Division Multiplex in cellular mobile communication networks OFDM), influences the main interference of systematic function from presence of intercell interference based on OFDM.
The interference coordination technique of minizone is one of effective means that improves systematic function.Interference coordination is called " interference is avoided ", " soft-frequency reuse " or " partial frequency multiplexing " again, is that (Long Term Evolution, LTE) one of interference control method of Kao Lving is mainly used in up present 3G Long Term Evolution.Existing disturbance coordination method is divided into several channeling collection with frequency resource.The user of center of housing estate can adopt lower power emission and reception, can not cause stronger presence of intercell interference even the central area user of neighbor cell takies identical frequency yet, thus center of housing estate zone user to be dispensed on the multiplexing factor be 1 channeling collection.And the user of cell edge region might cause stronger presence of intercell interference, so the cell edge region user is dispensed on the channeling collection that frequency duplex factor as one is N owing to need to adopt higher power to send and receive signal.
The basic principle of existing interference coordination as shown in Figure 1, Fig. 1 has described prior art medium frequency resource allocative decision spatially.As shown in Figure 1, each residential quarter is divided into inside and outside two-layer, and the foundation of division can be the quality of Radio Link etc.A user of external layer region, the subcarrier that it can be assigned to (group) can only be some subclass of whole system bandwidth, and the subclass that use in the outer zone of neighbor cell (the outer field different different frequency subsets of filling pattern representative in each residential quarter among Fig. 1) inequality, namely outer frequency duplex factor as one can only reach 3.And remaining frequency can be used in the middle white zone of each residential quarter, 7 residential quarters of Fig. 1, that is to say that the frequency duplex factor as one of residential quarter internal layer area is approximately 1.
By the frequency resource splitting scheme in the above-mentioned inter-cell interference coordination method and frequency resource allocation of space scheme, by the effective distribution to system resource, can guarantee the subcarrier non-overlapping copies that the fringe region of neighbor cell is assigned to, thereby improved the service quality of residential quarter outer users, even the service quality of whole system.
In the method for existing Inter-Cell Interference Coordination, because the prerequisite of its use is that radius of society is less, interference is caused in outer users easy adjacent residential quarter in residential quarter, so, existing inter-cell interference coordination method is applicable to interference-limited environment, the characteristics of interference-limited environment radius of society just are less, path loss between user and access base station is smaller, the covering of residential quarter outer users is out of question, but because the radius ratio less (about station spacing 500m) of residential quarter, under the interference-limited condition, the residential quarter outer users is bigger to the interference of adjacent residential quarter than residential quarter inner users to the interference that neighbor cell produces.
But if cover constrained environment, for example the station spacing of stipulating among the existing 3GPP TR25.814 is under the scene of 1732m, application scenarios is mainly suburb or rural area, the radius ratio of its residential quarter is bigger, path loss between user and access base station is relatively big, covering under the limited situation, with interference-limited environment antithesis, the interference that the residential quarter outer users that path loss is bigger produces neighbor cell, the residential quarter inner users littler than path loss is little to the interference that neighbor cell produces, therefore, covering under the constrained environment, the precondition of existing inter-cell interference coordination method institute foundation is no longer set up, and also just no longer is applicable to the covering constrained environment.
Summary of the invention
The embodiment of the invention provides a kind of frequency resource allocation method, is used for solving the problem that existing mobile communications network covers presence of intercell interference under the constrained environment.
The method that the embodiment of the invention provides is applied to the coverage constrained environment in the mobile communication system, comprising:
Whether judge the value of geometrical factor of reporting of user greater than preset threshold, if divide described user and be inner users; If not, divide described user and be outer users; Described geometrical factor is that the user arrives the path loss of Serving cell divided by the path loss sum of this user to one or several the strongest non-service cell; Or
Whether judge the downlink path loss value of reporting of user greater than preset threshold, if divide described user and be outer users; If not, divide described user and be inner users;
For the outer users of each residential quarter and neighbor cell thereof is distributed first frequency band;
For the inner users of each residential quarter and neighbor cell thereof is distributed second frequency band; Described first frequency band is each a part of frequency band sum of band system band two ends, and described second frequency band is the frequency band that band system band is removed the first frequency band remainder.
Distribute first frequency band for the outer users of each residential quarter and neighbor cell thereof, also comprise:
Outer users to residential quarter and neighbor cell thereof is used frequency hopping in described first frequency band that distributes.
Distribute second frequency band for the inner users of each residential quarter and neighbor cell thereof, also comprise:
Detectable signal according to described inner users sends obtains the channel quality information of described inner users on described second frequency band;
According to described channel quality information, inner users is carried out the scheduling of time-frequency selectivity at described second frequency band.
The embodiment of the invention provides a kind of frequency resource allocation device, comprising:
Division unit is used for judging that whether the value of geometrical factor of reporting of user is greater than preset threshold, if dividing described user is inner users; If not, divide described user and be outer users; Described geometrical factor is that the user arrives the path loss of Serving cell divided by the path loss sum of this user to one or several the strongest non-service cell; Or
Whether judge the downlink path loss value of reporting of user greater than preset threshold, if divide described user and be outer users; If not, divide described user and be inner users;
Allocation units are used to the outer users of each residential quarter and neighbor cell thereof to distribute first frequency band; And distribute second frequency band for the inner users of each residential quarter and neighbor cell thereof; Described first frequency band is each a part of frequency band sum of band system band two ends, and described second frequency band is the frequency band that band system band is removed the first frequency band remainder.
Allocation units in the frequency resource allocation device that the embodiment of the invention provides also are used for the outer users of residential quarter and neighbor cell thereof is used frequency hopping at described first frequency band that distributes.
Allocation units in the frequency resource allocation device that the embodiment of the invention provides also are used for the detectable signal according to described inner users transmission, obtain the channel quality information of described inner users on described second frequency band;
According to described channel quality information, inner users is carried out the scheduling of time-frequency selectivity at described second frequency band.
The beneficial effect of the embodiment of the invention is as follows:
A kind of frequency resource allocation method and device that the embodiment of the invention provides, be applied to the coverage constrained environment of mobile communication system, the frequency resource allocation method that the embodiment of the invention provides taken full advantage of under the coverage constrained environment residential quarter outer users to neighbor cell produce disturb less, and the residential quarter inner users produces the bigger characteristics of disturbing to neighbor cell, for the outer users of each residential quarter and neighbor cell thereof is distributed identical frequency band (first frequency band), for the inner users of each residential quarter and neighbor cell thereof is distributed identical frequency band (second frequency band), first frequency band and second frequency band are that subclass and both common factors of band system band is sky, such frequency resource allocation scheme, the frequency band that allows the outer users of one or more neighbor cells use is identical, make that the interference ratio that the more sensitive residential quarter of interference ratio outer users is born is less, improved the service quality of residential quarter outer users.
Further, the frequency resource allocation method that the embodiment of the invention provides, each residential quarter outer users each a part of frequency band at the two ends of whole system frequency band is carried out frequency hopping, can obtain frequency diversity gain and cell interference diversity gain, in addition, inner users to each residential quarter is carried out the scheduling of time-frequency selectivity at the frequency band of remainder, maximizes the throughput of system, has further improved the overall performance of system.
Description of drawings
Fig. 1 is prior art medium frequency resource allocative decision schematic diagram spatially;
The frequency resource allocation method flow chart that Fig. 2 provides for the embodiment of the invention;
The frequency resource allocation method schematic diagram spatially that Fig. 3 provides for the embodiment of the invention;
The division schematic diagram of frequency resource allocation method on band system band that Fig. 4 provides for the embodiment of the invention;
The frequency resource allocation apparatus structure schematic diagram that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, with specific embodiment a kind of frequency resource allocation method provided by the invention and device are described in detail.
The designer is according under the existing coverage constrained environment, the residential quarter outer users is less to neighbor cell generation interference, and the residential quarter inner users produce to be disturbed bigger characteristics to neighbor cell, has proposed to be applied to the new distribution method of frequency resource under the existing coverage constrained environment.Frequency resource allocation method that the embodiment of the invention proposes also is based on the basic norm of the interference coordination of minizone, this criterion namely: relatively poor for link-quality in this residential quarter, distribute identical frequency band to disturbing the smaller user of presence of intercell interference who produces in more sensitive user and the neighbor cell; And distribute identical frequency band for the bigger user of link-quality is better, antijamming capability is more intense in this residential quarter user and the presence of intercell interference of the interior generation of neighbor cell.
Specifically, a kind of frequency resource allocation method that the embodiment of the invention provides as shown in Figure 2, may further comprise the steps:
Step S201, the user of each residential quarter is divided into inner users and outer users.
The user of each residential quarter is divided into inner users and outer users, the mode of dividing can have following two kinds: a kind of is that the size of the value of the geometrical factor (Geometry) according to reporting of user is divided, geometrical factor refer to this user to the path loss of Serving cell divided by the path loss sum of this user to one or several the strongest non-service cell.The value that geometrical factor was measured and calculated to user place terminal can report system afterwards.Whether system judges the value of geometrical factor of this reporting of user greater than preset threshold, if, divide it and be the inner users of residential quarter, if not, divide it and be the outer users of residential quarter.
Another kind of mode is to divide according to the size of the value of the downlink path loss (path loss) of reporting of user.The terminal measurement of user place can report system after calculating the downlink path loss, system judges that whether the downlink path loss of this reporting of user is greater than preset threshold, if divide it for the outer users of residential quarter, if not, divide it and be the inner users of residential quarter.
Residential quarter in the embodiment of the invention can be a cellular cell under the omnidirectional antenna, also can be a sector under the sectorized antennas.
S202, distribute first frequency band for the outer users of each residential quarter and neighbor cell thereof; For the inner users of each residential quarter and neighbor cell thereof is distributed second frequency band.
First frequency band and second frequency band are that subclass and both common factors of band system band is sky.
Covering under the constrained environment, for each residential quarter, this residential quarter in link-quality relatively poor, be the outer users of this residential quarter to disturbing more sensitive user, the smaller user of presence of intercell interference of generation then is the outer users of neighbor cell in the neighbor cell; And the user that link-quality is better in this residential quarter, antijamming capability is more intense is the inner users of this residential quarter, the bigger user of presence of intercell interference who produces in the neighbor cell then is the inner users of neighbor cell, so, criterion according to aforementioned Inter-Cell Interference Coordination, the frequency allocation method that the embodiment of the invention provides is for the outer users of each residential quarter and adjacent residential quarter thereof is distributed identical frequency band (i.e. first frequency band); And, for the inner users of each residential quarter and adjacent residential quarter thereof is distributed identical frequency band (i.e. second frequency band).First frequency band and second frequency band are some subclass of whole system frequency band, and do not occur simultaneously between the two.
Certainly, the frequency range of above-mentioned first frequency band and second frequency band can equate with the whole system frequency band, also can be less than the whole system frequency band.Certainly, in order to take full advantage of frequency resource, can set second frequency band and remove the frequency band of the first frequency band remainder for the whole system frequency band, that is to say that the frequency range sum of first frequency band and second frequency band equals the whole system frequency band.
According to the said frequencies Resource Allocation Formula, the band resource that each residential quarter is distributed distribution signal spatially as shown in Figure 3, the outer users of residential quarter 1 and neighbor cell thereof (residential quarter 2 to residential quarter 7) is used i.e. first frequency band (filling part of tiltedly ruling) of identical frequency band, and the inner users of each residential quarter of residential quarter 1 to residential quarter 7 uses the whole system frequency band to remove the frequency band of the first frequency band remainder.Fig. 3 is a signal, and when practical application, the internal layer of each residential quarter and outer field division spatially may be irregular.
Among this step S202, on the basis of the above-mentioned new frequency allocation plan that the embodiment of the invention provides, can be optimized further.
As shown in Figure 4, distribute to each residential quarter outer users be each component frequency resource at the two ends of whole system frequency band, remaining frequency band is then distributed to the inner users of each residential quarter and is used.Black part divides expression to distribute to first frequency band that the residential quarter outer users is used among Fig. 4, white portion represents to distribute to second frequency band that the residential quarter inner users is used, first frequency band that the residential quarter outer users is used can be corresponding with the quantity of residential quarter ectonexine user and residential quarter inner users with the amount of bandwidth of second frequency band that the residential quarter inner users is used, that is to say, if inner users is more, the bandwidth of distributing to the frequency band of inner users so can be big relatively, otherwise, if inner users is few, the bandwidth of distributing to the frequency band of inner users so can be smaller relatively.
Because covering under the constrained environment, the outer link-quality of residential quarter is relatively poor, the power limited of its outer users, the quality that is to say the detectable signal (sounding) that the outer users of residential quarter sends can not be guaranteed, necessity, the reliability of the residential quarter outer users being carried out the scheduling of time-frequency selectivity reduce, so can use frequency hopping at employed first frequency band to the outer users of residential quarter, make the carrier frequency of its use in the scope of first frequency band, carry out saltus step by certain sequence, thereby obtain certain frequency diversity gain and cell interference diversity gain.And in the embodiment of the invention, because first frequency band is each a part of frequency band at the two ends of whole system frequency band, using such frequency band to carry out frequency hopping can be so that frequency diversity gain be bigger, better effects if.
On the other hand, in the embodiment of the invention, the residential quarter outer users is in another layer reason that use first frequency band carries out frequency hopping, present 3GPP Long Term Evolution (Long Term Evolution, what LTE) system uplink adopted is the single-carrier frequency division multiple access access mechanism, the frequency of distributing for each user must be continuous, if distributing a part of frequency band at the two ends of whole system frequency band is the outer users use of residential quarter, the frequency band of the centre of whole system frequency band remainder is exactly continuous so, can better meet the requirement of inner users uplink single-carrier transmission like this.
The inner users of residential quarter is because its power is not limited, therefore, system can also be by receiving the detectable signal that the residential quarter inner users sends, obtain the channel quality information of this user on the frequency band that distributes, and according to the channel quality information that gets access to, the residential quarter inner users is carried out the scheduling of time-frequency selectivity, the throughput of maximization system.
According to the said frequencies resource allocation methods, the embodiment of the invention also provides a kind of frequency resource allocation device, as shown in Figure 5, comprising: division unit 501 and allocation units 502; Wherein:
A kind of frequency resource allocation method and device that the embodiment of the invention provides, be applied to the coverage constrained environment of mobile communication system, the frequency resource allocation method that the embodiment of the invention provides taken full advantage of under the coverage constrained environment residential quarter outer users to neighbor cell produce disturb less, and the residential quarter inner users produces the bigger characteristics of disturbing to neighbor cell, for the outer users of each residential quarter and neighbor cell thereof is distributed identical frequency band (first frequency band), for the inner users of each residential quarter and neighbor cell thereof is distributed identical frequency band (second frequency band), first frequency band and second frequency band are that subclass and both common factors of band system band is sky, such frequency resource allocation scheme, the frequency band that allows the outer users of one or more neighbor cells use is identical, make that the interference ratio of the more sensitive residential quarter of interference ratio outer users being born in the residential quarter is less, improved the service quality of residential quarter outer users.
Further, the frequency resource allocation method that the embodiment of the invention provides, each residential quarter outer users each a part of frequency band at the two ends of whole system frequency band is carried out frequency hopping, can obtain frequency diversity gain and cell interference diversity gain, in addition, inner users to each residential quarter is carried out the scheduling of time-frequency selectivity at the frequency band of remainder, maximizes the throughput of system, has further improved the overall performance of system.
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, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. a frequency resource allocation method is applied to the coverage constrained environment in the mobile communication system, it is characterized in that, comprising:
Whether judge the value of geometrical factor of reporting of user greater than preset threshold, if divide described user and be inner users; If not, divide described user and be outer users; Described geometrical factor is that the user arrives the path loss of Serving cell divided by the path loss sum of this user to one or several the strongest non-service cell; Or
Whether judge the downlink path loss value of reporting of user greater than preset threshold, if divide described user and be outer users; If not, divide described user and be inner users;
For the outer users of each residential quarter and neighbor cell thereof is distributed first frequency band;
For the inner users of each residential quarter and neighbor cell thereof is distributed second frequency band; Described first frequency band is each a part of frequency band sum of band system band two ends, and described second frequency band is the frequency band that band system band is removed the first frequency band remainder.
2. the method for claim 1 is characterized in that, distributes first frequency band for the outer users of each residential quarter and neighbor cell thereof, also comprises:
Outer users to residential quarter and neighbor cell thereof is used frequency hopping in described first frequency band that distributes.
3. the method for claim 1 is characterized in that, distributes second frequency band for the inner users of each residential quarter and neighbor cell thereof, also comprises:
Detectable signal according to described inner users sends obtains the channel quality information of described inner users on described second frequency band;
According to described channel quality information, inner users is carried out the scheduling of time-frequency selectivity at described second frequency band.
4. a frequency resource allocation device is characterized in that, comprising:
Division unit is used for judging that whether the value of geometrical factor of reporting of user is greater than preset threshold, if dividing described user is inner users; If not, divide described user and be outer users; Described geometrical factor is that the user arrives the path loss of Serving cell divided by the path loss sum of this user to one or several the strongest non-service cell; Or
Whether judge the downlink path loss value of reporting of user greater than preset threshold, if divide described user and be outer users; If not, divide described user and be inner users;
Allocation units are used to the outer users of each residential quarter and neighbor cell thereof to distribute first frequency band; And distribute second frequency band for the inner users of each residential quarter and neighbor cell thereof; Described first frequency band is each a part of frequency band sum of band system band two ends, and described second frequency band is the frequency band that band system band is removed the first frequency band remainder.
5. device as claimed in claim 4 is characterized in that, described allocation units also are used for the outer users of residential quarter and neighbor cell thereof is used frequency hopping at described first frequency band that distributes.
6. device as claimed in claim 4 is characterized in that, described allocation units also are used for the detectable signal according to described inner users transmission, obtain the channel quality information of described inner users on described second frequency band;
According to described channel quality information, inner users is carried out the scheduling of time-frequency selectivity at described second frequency band.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102316467B (en) * | 2010-07-02 | 2016-04-13 | 中兴通讯股份有限公司 | The method and apparatus of allocate communications resource |
| CN102340776B (en) * | 2010-07-20 | 2014-06-11 | 中兴通讯股份有限公司 | Time frequency resource classification method and base station |
| CN102811458B (en) * | 2011-06-01 | 2017-04-12 | 中兴通讯股份有限公司 | Inter-cell interference coordination method and base station |
| CN102857929B (en) * | 2011-06-29 | 2015-10-14 | 中国普天信息产业股份有限公司 | A kind of disturbance coordination method of sectorization identical networking communication system |
| CN107251445B (en) * | 2015-03-04 | 2019-12-17 | 华为技术有限公司 | transmission device, system and method based on frequency hopping |
| WO2016149916A1 (en) * | 2015-03-25 | 2016-09-29 | 华为技术有限公司 | Data transmission method and apparatus |
| CN107484203A (en) * | 2017-07-24 | 2017-12-15 | 武汉虹信通信技术有限责任公司 | A kind of data transmission method for being used to support spread bandwidth |
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| CN101145827A (en) * | 2006-09-12 | 2008-03-19 | 中兴通讯股份有限公司 | Channel allocation method of multi-carrier cell in TD-SCDMA system |
| CN101247165A (en) * | 2007-02-16 | 2008-08-20 | 中兴通讯股份有限公司 | Networking system of TD-SCDMA system multi-frequency point community |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101145827A (en) * | 2006-09-12 | 2008-03-19 | 中兴通讯股份有限公司 | Channel allocation method of multi-carrier cell in TD-SCDMA system |
| CN101247165A (en) * | 2007-02-16 | 2008-08-20 | 中兴通讯股份有限公司 | Networking system of TD-SCDMA system multi-frequency point community |
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