CN102316467B - The method and apparatus of allocate communications resource - Google Patents
The method and apparatus of allocate communications resource Download PDFInfo
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- CN102316467B CN102316467B CN201010223305.0A CN201010223305A CN102316467B CN 102316467 B CN102316467 B CN 102316467B CN 201010223305 A CN201010223305 A CN 201010223305A CN 102316467 B CN102316467 B CN 102316467B
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Abstract
The invention discloses a kind of method and apparatus of allocate communications resource, to solve the problem that there is more serious interference in prior art between different sector between inner ring user and outer shroud user.The method comprises: be divided into inner ring user and outer shroud user to the user in community; Outer shroud user in different for described community sector is divided to different frame.Adopt technical scheme of the present invention, the interference between different sector inner ring user and outer shroud user can be suppressed, thus improve system spectrum utilance, increase the capacity of system.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a method and an apparatus for allocating communication resources.
Background
The frequency reuse technology is a networking technology proposed to improve spectrum utilization and expand system capacity. Conventional frequency multiplexing techniques can be classified into an inter-frequency multiplexing technique and an intra-frequency multiplexing technique. The same-frequency reuse technology can make the frequency reuse factor 1, that is, the cells in the coverage area of the whole system use the same frequency band to serve the users in the cell. The different-frequency multiplexing technology combines a plurality of cells using different frequency bands in a system into a multiplexing cluster, and the frequency bands occupied in the multiplexing cluster are all the frequency bands allowed to be used by the system. And the whole system is composed of one multiplexing cluster.
The same-frequency multiplexing technology has high spectrum utilization rate and system capacity because the multiplexing factor is only 1. However, since all cells use the same frequency band, edge users are subject to co-channel interference from other neighboring cells, and the communication quality is seriously affected, and thus is rarely used in an actual cellular system. The different-frequency multiplexing technology can well inhibit the same-frequency interference because the physical positions of the same-frequency cells are far away from each other. However, as the number of wireless users increases, the system capacity of the inter-frequency multiplexing system is greatly tested.
The fractional frequency reuse FFR technique is a new technique for increasing the system capacity. The idea of FFR is: the user in the center of the cell has better channel condition, and is distributed on a reuse set with a frequency reuse factor of 1 because the physical positions are far apart and the interference to other cells is not large; the cell edge users are distributed on a reuse set with a frequency reuse factor of 3 because the cell edge users are far away from the base station, the channel conditions are poor, and the interference with the users of other cells is large.
In the OFDMA system, the users are orthogonal in frequency, so the interference of all users in the cell comes from other cells, and the Carrier Interference Noise Ratio (CINR) of the users in the center of the cell is greatly improved. However, the users located at the edge of the cell are far away from the base station and are interfered by the users using the same carrier resources in the adjacent cell, so that the communication quality of the edge users is poor, and the throughput of the system is reduced.
Fig. 1 is a schematic diagram of the division of the inner and outer ring regions of a cell according to the prior art, in which a system divides the inner and outer rings according to signal quality, the region with strong signal is divided into the inner ring, and the region with weak signal is divided into the outer ring, where a0, a1, a2 respectively represent the outer ring regions of sector 0, sector 1 and sector 2, and B0, B1, B2 respectively represent the inner ring regions of sector 0, sector 1 and sector 2. For convenience of description, the total bandwidth of the system is set to be S.
The conventional frequency division FFR scheme uses frequency resources of 2/3, i.e., 2S/3, of the entire frequency band for the inner loop region and 1/3, i.e., S/3, of the entire frequency band for the outer loop region. Fig. 2 is a schematic diagram of time-frequency domain resource occupation of inner and outer rings in a conventional frequency division FFR method according to the prior art. As shown in fig. 2, the method divides the inner ring and the outer ring into frequency domains, the inner and outer ring regions in the same sector do not have interference problems, and the inner ring uses 2/3 total frequency band, which improves the spectrum utilization rate to a certain extent. However, since different sector users use frequency resources simultaneously, there is more serious interference between inner-loop users and outer-loop users between different sectors.
In carrying out the present invention, the inventors have discovered that, according to the prior art, there is more severe interference between inner-loop users and outer-loop users among different sectors.
Disclosure of Invention
The present invention mainly aims to provide a method and a device for allocating communication resources, so as to solve the problem of the prior art that serious interference exists between inner-loop users and outer-loop users in different sectors.
To solve the above problem, according to an aspect of the present invention, there is provided a method of allocating communication resources, comprising: dividing users in a cell into inner ring users and outer ring users; and dividing the outer ring users in different sectors of the cell into different frames.
To solve the above problem, according to another aspect of the present invention, there is provided an apparatus for allocating communication resources, comprising: the storage module is used for storing the division results of the inner ring users and the outer ring users in the cell; and the allocation module is used for dividing the outer ring users in different sectors of the cell into different frames according to the division result of the inner ring users and the outer ring users in the cell.
According to the technical scheme of the invention, the interference between the inner-loop users and the outer-loop users in different sectors can be inhibited, so that the frequency spectrum utilization rate of the system is improved, and the throughput of the system is increased.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic illustration of the division of inner and outer ring regions of a cell according to the prior art;
fig. 2 is a schematic diagram of the resource occupation of inner and outer rings in a conventional frequency division FFR method according to the prior art;
fig. 3 is a flow chart of a method of allocating communication resources according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating providing time-frequency resources for different outer rings of sectors in different frames according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an arrangement for allocating communication resources according to an embodiment of the present invention; and
fig. 6 is a flowchart of an implementation manner of providing time-frequency resources for a user according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 3 is a flow chart of a method of allocating communication resources according to an embodiment of the present invention.
As shown in fig. 3, the method for allocating communication resources in the embodiment of the present invention mainly includes the following steps:
step S32: the users in the cell are divided into inner-loop users and outer-loop users.
Step S34: and dividing the outer ring users in different sectors of the cell into different frames.
The above steps are further described below. Fig. 4 is a schematic diagram of providing time-frequency resources for different outer rings of sectors in different frames according to an embodiment of the present invention. Referring to fig. 4, in different frames, namely, the 3m frame, the 3m +1 frame, the 3m +2 frame and the 3(m +1) frame, time-frequency resources are divided for outer ring regions a0, a1, a2 and a0 of sector 0, sector 1, sector 2 and sector 0, respectively, and as the time axis extends, the time-frequency resources can continue to be divided for the outer ring regions according to the rule shown in the figure. Fig. 4 is merely an example, and other division manners may be adopted as long as time-frequency resources can be provided for different outer rings of sectors in different frames. For example, 0 to S/3 or 2S/3 to S in the frequency range may be divided into outer loop regions in the second frame. It can be seen that by adopting the method, the interference between the inner-loop users and the outer-loop users in different sectors can be inhibited, thereby improving the utilization rate of the system frequency spectrum and increasing the throughput of the system.
In step S32, the users in the cell may be specifically divided into inner-loop users and outer-loop users according to the signal quality information reported by the users. The signal quality information may specifically be a carrier to interference plus noise ratio. The uplink frame structure may be divided into an inner ring region and an outer ring region before dividing the inner ring users and the outer ring users. If the cell includes 3 sectors, the inner-loop region may occupy 2/3 total bands in the frequency domain, and the outer-loop region may occupy 1/3 total bands; generally, if a cell includes N sectors, an inner-loop region may occupy (N-1)/N total frequency band in a frequency domain, and an outer-loop region may occupy 1/N total frequency band.
Fig. 5 is a diagram illustrating a structure of an apparatus for allocating communication resources according to an embodiment of the present invention. As shown in fig. 5, in the embodiment of the present invention, an apparatus 50 for allocating communication resources mainly includes a storage module 51 and an allocation module 53, where the storage module is configured to store a division result of inner-loop users and outer-loop users in a cell; the allocation module is used for dividing the outer ring users in different sectors of the cell into different frames according to the division result of the inner ring users and the outer ring users in the cell.
The apparatus 50 for allocating communication resources may further include a receiving module and a user dividing module, wherein the receiving module is configured to receive signal quality information reported by a user; and the user dividing module is used for dividing the users of the cell into inner-ring users and outer-ring users according to the signal quality information reported by the users.
The apparatus 50 for allocating communication resources may further include a region dividing module for dividing the uplink frame structure into an inner ring region and an outer ring region, wherein the inner ring region occupies 2/3 the total frequency band in the frequency domain, and the outer ring region occupies 1/3 the total frequency band.
The allocation module 53 may be configured to partition time-frequency resources occupied by the outer-ring area for the sector 0 in the N × m frame, partition time-frequency resources occupied by the outer-ring area for the sector 1 in the N × m +1 frame, and so on, and partition time-frequency resources occupied by the outer-ring area for the sector (N-1) in the N × m + (N-1) frame; where N is the number of sectors of the cell.
An optional specific implementation flow of the technical solution of the embodiment of the present invention is described below with reference to fig. 6. Fig. 6 is a flowchart of an implementation manner of providing time-frequency resources for a user according to an embodiment of the present invention.
Firstly, dividing inner and outer ring areas in an uplink frame of a system according to a frame number. The division can be done in the manner of fig. 4. The method specifically comprises the following steps:
(1) if the frame needing to be transmitted is a 3m frame (wherein m is 0, 1, 2.. said.), an inner ring area and an outer ring area are divided for the sector 0 in the frame: the frequency domain 0 to S/3 frequency bands occupy S/3 frequency band which is the frequency domain resource occupied by the outer ring of the sector, and the other S/3 to S frequency bands occupy 2S/3 frequency band which is the frequency domain resource occupied by the inner ring of the system; (2) similarly, if the transmission frame is the 3m +1 th frame, the outer ring area is divided for the sector 1 in the frame: the S/3 frequency band occupied by the S/3 to 2S/3 frequency bands of the frequency domain is the frequency domain resource occupied by the outer ring of the sector, and the rest 2S/3 frequency bands are the frequency domain resource occupied by the inner ring of the system; (3) and if the transmission frame is the 3m +2 th frame, dividing the outer ring area for the sector 2 in the frame: the S/3 frequency bands occupied by the 2S/3 to S frequency bands are the frequency domain resources occupied by the outer ring of the sector, and the rest 2S/3 frequency bands are the frequency domain resources occupied by the inner ring of the system.
Next, the user inner and outer ring types are determined. And the base station calculates a statistical mean value of the CINR reported by the terminal user. If the CINR mean value reported by the terminal is greater than the threshold TH, the terminal user is judged as an inner-loop user; otherwise, if the CINR mean value reported by the terminal user is less than or equal to the threshold TH, the terminal user is determined as an outer-loop user.
And then provides corresponding time-frequency resources for the users. Firstly, judging the types of an inner ring and an outer ring of a user, if the user is an inner ring user, allocating time-frequency resources to the user in an inner ring area of any frame to be transmitted, and providing services required by the user for transmitting data; if the user is an outer-loop user, determining a frame for providing time-frequency resources for the user according to the sector where the user is located: i.e., the users of sector i (where i is 0, 1, 2) need to use the time-frequency resources provided by the 3m + i frame (where m is 0, 1. The time-frequency resources are then provided to the user in the outer annular region in the selected frame. The flow ends so far.
In the above specific description, the three-sector cell is taken as an example, and the practical application scenario includes cells with other sectors. If the number of sectors in a cell is N, when an uplink frame structure is divided into an inner ring area and an outer ring area, the inner ring area occupies (N-1)/N total frequency bands in a frequency domain, and the outer ring area occupies 1/N total frequency bands. In this way, a similar FFR scheme based on time domain frame division can be adopted to eliminate the interference between the outer ring users and the inner ring users of different sectors, thereby improving the frequency spectrum utilization rate and achieving the purpose of improving the system capacity.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for allocating communication resources, comprising:
dividing users in a cell into inner-loop users and outer-loop users, wherein if the average value of carrier to interference and noise ratios (CINR) reported by a terminal is greater than a threshold TH, the user corresponding to the terminal is determined as the inner-loop user; otherwise, if the CINR mean value reported by the terminal user is less than or equal to the threshold TH, determining the user corresponding to the terminal as an outer-loop user;
dividing outer ring users in different sectors of the cell into different frames;
wherein,
the cell comprises N sectors, wherein an inner ring area occupies (N-1)/N total frequency bands in a frequency domain, and an outer ring area occupies 1/N total frequency bands;
dividing outer-loop users in different sectors of the cell into different frames comprises: time-frequency resources occupied by the outer ring area divided for the sector 0 in the Nx m frame, time-frequency resources occupied by the outer ring area divided for the sector 1 in the Nx m +1 frame, and so on, time-frequency resources occupied by the outer ring area divided for the sector (N-1) in the Nx m + (N-1) frame; wherein m is an integer of not less than 0.
2. The method of claim 1, wherein the dividing users in a cell into inner-loop users and outer-loop users comprises:
and dividing users of the cell into inner-ring users and outer-ring users according to the signal quality information reported by the users.
3. The method of claim 2, wherein the signal quality information comprises a carrier-to-interference-and-noise ratio.
4. The method of claim 1,
the cell comprises 3 sectors;
before dividing users of a cell into inner ring users and outer ring users, the method further comprises the following steps:
the uplink frame structure is divided into an inner loop region and an outer loop region, wherein the inner loop region occupies 2/3 total frequency band in the frequency domain, and the outer loop region occupies 1/3 total frequency band.
5. The method of claim 1,
the cell includes N sectors;
before dividing users of a cell into inner ring users and outer ring users, the method further comprises the following steps:
the uplink frame structure is divided into an inner ring area and an outer ring area, wherein the inner ring area occupies (N-1)/N total frequency bands in a frequency domain, and the outer ring area occupies 1/N total frequency bands.
6. An apparatus for allocating communication resources, comprising:
a storage module, configured to store a result of dividing an inner-loop user and an outer-loop user in a cell, where if a mean value of carrier to interference noise ratios CINR reported by a terminal is greater than a threshold TH, a user corresponding to the terminal is determined as an inner-loop user; otherwise, if the CINR mean value reported by the terminal user is less than or equal to the threshold TH, determining the user corresponding to the terminal as an outer-loop user;
the distribution module is used for dividing the outer ring users in different sectors of the cell into different frames according to the division result of the inner ring users and the outer ring users in the cell; the cell comprises N sectors, an inner ring area occupies (N-1)/N total frequency bands in a frequency domain, and an outer ring area occupies 1/N total frequency bands;
the distribution module is also used for dividing time-frequency resources occupied by the outer ring area for the sector 0 in the Nx m frame, dividing time-frequency resources occupied by the outer ring area for the sector 1 in the Nx m +1 frame, and so on, and dividing time-frequency resources occupied by the outer ring area for the sector (N-1) in the Nx m + (N-1) frame; where N is the number of sectors of the cell.
7. The apparatus of claim 6, further comprising:
the receiving module is used for receiving signal quality information reported by a user;
and the user dividing module is used for dividing the users of the cell into inner-ring users and outer-ring users according to the signal quality information reported by the users.
8. The apparatus of claim 6, further comprising a region dividing module for dividing the uplink frame structure into an inner ring region and an outer ring region, wherein the inner ring region occupies 2/3 total frequency band in the frequency domain, and the outer ring region occupies 1/3 total frequency band.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222728A (en) * | 2007-01-09 | 2008-07-16 | 华为技术有限公司 | Method and system for using time frequency resource in OFDMA system |
| EP2079257A1 (en) * | 2008-01-10 | 2009-07-15 | Nokia Siemens Networks Oy | Time based and hybrid resource partitioning |
| CN101742519A (en) * | 2008-11-05 | 2010-06-16 | 中国移动通信集团公司 | A frequency resource allocation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222728A (en) * | 2007-01-09 | 2008-07-16 | 华为技术有限公司 | Method and system for using time frequency resource in OFDMA system |
| EP2079257A1 (en) * | 2008-01-10 | 2009-07-15 | Nokia Siemens Networks Oy | Time based and hybrid resource partitioning |
| CN101742519A (en) * | 2008-11-05 | 2010-06-16 | 中国移动通信集团公司 | A frequency resource allocation method and device |
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