CN101765119B - Dynamic fractional frequency reuse method based on OFDMA wireless cellular network - Google Patents
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Abstract
The invention discloses a dynamic fractional frequency reuse method based on an OFDMA wireless cellular network. The method is characterized in that in the OFDMA wireless cellular network, each cell sends the interference avoiding request on a respective priority sub band to an adjacent interference cell, each cell lowers the corresponding sending frequency on the interference avoiding sub bands when receiving the interference avoiding request on the respective priority sub band, at the time, the fractional frequency reuse patterns of marginal mobile terminals can be favorably and dynamically obtained, and the inter-cell interference (ICI) of the marginal mobile terminals of each cell distributed to the priority sub bands can be effectively reduced. The method of the invention can effectively lower the ICI in the OFDMA wireless cellular network under the condition of not lowering the frequency spectrum utilizing rate and the total network volume, so the throughput performance of the marginal mobile terminals can be improved.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a dynamic fractional frequency reuse method based on an Orthogonal Frequency Division Multiple Access (OFDMA) wireless cellular network.
Background
In order to provide high-speed data services for mobile terminals in next generation wireless cellular networks (e.g., LTE), OFDMA is proposed as an effective multiple access scheme. In OFDMA, multi-mobile terminal access may be achieved by providing different available subcarriers for each mobile terminal in different time slices. Fig. 1 shows an OFDMA scheme in which different colors represent different mobile terminals, occupying different spectral resources at different times. After each timeslot is over, the cell resources will be newly allocated. In the OFDMA cellular network downlink, since orthogonality exists between subcarriers within a single cell, interference between mobile terminals of the same cell hardly exists. However, when the frequency reuse factor of each cell of the OFDMA cellular network is 1, severe inter-cell interference (ICI) is generated, which will degrade the overall throughput of the system. ICI suffered by cell-edge mobile terminals is particularly severe and their throughput performance is very poor. Therefore, how to reduce ICI in OFDMA cellular networks without reducing spectrum utilization and overall system capacity, improving the throughput of cell-edge mobile terminals remains a challenging problem. Currently, the relevant methods for reducing ICI are:
(1) the frequency Reuse factor is 3(Reuse 3) method, see s.e. elayoubi, o.benhaddada, and b.fourier, "Performance evaluation of frequency planning in OFDMA-based networks," IEEE Transactions on wireless communications, vol.7, No.5, pp.1623-1633, 2008, which equally divides the entire available frequency band into 3 parts for three adjacent cells, thereby greatly reducing co-channel interference between adjacent cells. However, since each cell can only use 1/3 of bandwidth, the spectrum utilization is low.
(2) In a Soft Frequency Reuse (SFR) method, see 3GPP, R1-050507, Huawei, "soft frequency reuse scheme for UTRAN LTE," 2005, a frequency reuse factor of a cell center region is 1 and a frequency reuse factor of a cell edge region is 3.
The above methods are all static frequency reuse schemes, and cannot meet the dynamic channel environment change requirement.
Disclosure of Invention
The invention aims to provide a dynamic fractional frequency reuse method based on an OFDMA wireless cellular network, which can reduce the inter-cell interference in the OFDMA wireless cellular network and improve the throughput of a cell edge mobile terminal under the condition of not reducing the frequency spectrum utilization rate and the total network capacity.
The invention provides a dynamic fractional frequency reuse method based on an OFDMA wireless cellular network, which is characterized by comprising the following steps:
And 2, planning sub-bands by each cell: each cell selects a part of sub-bands as a public sub-band of the cell, then selects a part of sub-bands as a priority sub-band of the cell, and selects the rest sub-bands as interference avoidance sub-bands of the cell, wherein the following conditions are met in the selection process: all cells select subbands with the same frequency as a public subband of the cell, adjacent cells select subbands with different frequencies as a priority subband of the cell, and the public subband and the priority subband of each cell are arranged in a dressing mode on a frequency axis;
and 6, after each cell base station receives the interference avoidance request, reducing corresponding transmitting power on corresponding interference avoidance sub-bands.
The method of the invention is a dynamic fractional frequency reuse method based on OFDMA wireless cellular network. In an OFDMA wireless cellular network, each cell sends an interference avoidance request to an adjacent interfering cell on its respective priority subband. And when each cell receives the interference avoidance request on the respective interference avoidance sub-band, corresponding transmitting power is reduced on the interference avoidance sub-bands. At this time, the fractional frequency reuse pattern beneficial to the edge mobile terminal is dynamically obtained, and the ICI suffered by the edge mobile terminal allocated to the priority sub-band by each cell is effectively reduced. Therefore, the method of the invention can effectively reduce ICI in the OFDMA wireless cellular network under the condition of not reducing the frequency spectrum utilization rate and the total network capacity, thereby improving the throughput performance of the edge mobile terminal.
Drawings
FIG. 1 is a diagram of OFDMA in the background art;
FIG. 2 is a flow chart of the method of the present invention;
figure 3.1 is a schematic diagram of an OFDMA wireless cellular network; FIG. 3.2 is a schematic diagram of different types of subband planning in neighboring cells according to the present invention;
fig. 4 is a diagram illustrating different types of sub-band assignments in accordance with the present invention.
Detailed Description
The present invention is explained in more detail below by means of examples, which are only illustrative and the scope of protection of the present invention is not limited by these examples.
As shown in fig. 2, the present invention specifically includes the following steps:
1. an OFDMA wireless cellular network consists of several cells, each cell having a base station and several mobile terminals. In the downlink channel of the OFDMA wireless cellular network, each cell uniformly divides frequency resources allowed to be used by the network into a plurality of sub-bands, and each sub-band is called a sub-band. The network classifies these subbands into three types, the names of which are: a common subband, a priority subband and an interference avoidance subband. The transmit power for each type of subband is limited as follows:
the transmission power of the common sub-band and the priority sub-band is constant at Pmax(PmaxMaximum transmit power per subband), transmit power P of the interference avoidance subbandIASBIs variable and has a value range of 0-PIASB≤Pmax。
Maximum transmission power P on each sub-band using the following formulamaxAnd (3) calculating:
wherein, PcellIs the maximum transmit power, N, of the cell base stationSBIs the number of subbands per cell.
2. And planning a public sub-band, a priority sub-band and an interference avoidance sub-band in each cell.
When planning different types of sub-bands of each cell, each cell selects a part of sub-bands as a common sub-band of the cell, selects a part of sub-bands as a priority sub-band of the cell, and uses the rest sub-bands as interference avoidance sub-bands of the cell. The sub-bands are selected randomly on the premise of meeting the following selection principle:
principle one: all cells select the sub-band with the same frequency as the common sub-band of the cell.
Principle two: in order to more effectively reduce the interference between cells, adjacent cells select subbands of different frequencies as the priority subbands of the cell.
Principle three: in order to obtain a large frequency diversity gain, the common and priority subbands of the cells are comb-arranged on the frequency axis.
Assume that there are J (J ═ 7) cells in the OFDMA wireless cellular network, one base station per cell, as shown in fig. 3.1. As shown in fig. 3.2, each cell allows all subbands to be allocated, assuming that the total number of subbands in each cell is 16. For convenience of description, each sub-band is assigned a unique logical number. Logically numbered subbands means that they are subbands of the same frequency. All cells (cells 1 to 7) choose subbands 1, 5, 9, 13 as common subbands in the cell. The sub-band {2, 6, 10, 14} is selected as the priority sub-band of the local cell in the cell 1, the sub-band {3, 7, 11, 15} is selected as the priority sub-band of the local cell in the cell {2, 4, 6}, and the sub-band {4, 8, 12, 16} is selected as the priority sub-band of the local cell in the cell {3, 5, 7 }. Therefore, the priority subbands of the neighboring cells are orthogonal to each other. And each cell takes the rest sub-bands as interference avoidance sub-bands of the cell.
3. On the common subband, the mobile terminal measures the strength of a useful signal from the cell and the strength of interference signals from surrounding adjacent cells, and the mobile terminal feeds back the information to the base station of the cell. And the cell base station divides the mobile terminal into a central mobile terminal or an edge mobile terminal according to the information fed back by the mobile terminal.
The specific process is as follows:
let i, j denote the serial numbers of two different cells, uiIndicating the number of mobile terminals in cell i, ciIndicating the sequence number of the common subband in cell i. Common subband c in cell iiUp, mobile terminal uiMeasuring useful signal strength from own cellAnd interfering signal strength from surrounding neighbor cell j
Mobile terminal uiWill be provided with
And
and feeding back to the base station of the cell i.
Base station of cell i according to mobile terminal uiWith feedback
And
calculating the mobile terminal u using the formulaiIn the common sub-band ciSignal to interference ratio of
Where J represents the total number of cells in the cellular network.
Base station acquisition for cell iThen, the mobile terminal u is estimated by using the following formulaiAverage signal-to-interference ratio over all sub-bands
Wherein A isCSB，iSet representing common subband sequence numbers in cell i, NCSB，iRepresenting the total number of common subbands in cell i.
Base station acquisition for cell i
After, handleComparing with a division threshold delta (the division threshold delta is determined in network planning and determines the proportion of the central mobile terminal and the edge mobile terminal, generally 0 & ltdelta & lt & lt10 & gt) preset by the edge mobile terminal, if the division threshold delta is larger than the division threshold delta & ltdelta & lt 10 & gt, comparing the division threshold delta & ltdelta & gt with the division threshold delta & ltdelta & lt 10 & gt <math>
<mrow>
<msub>
<mi>γ</mi>
<msub>
<mi>u</mi>
<mi>i</mi>
</msub>
</msub>
<mo>></mo>
<mi>δ</mi>
<mo>,</mo>
</mrow>
</math> Then the mobile terminal u is connected toiDivision into central mobile terminals, otherwise the mobile terminal uiDivided into edge mobile terminals.
4. The cell base station allocates the sub-bands to the mobile terminals according to the division information of the mobile terminals.
The principle of allocation is:
as shown in fig. 4, edge mobile terminals are allowed to be assigned to all types of sub-bands, but center mobile terminals are allowed to be assigned to only two types of sub-bands: a common subband and an interference avoidance subband.
5. For the edge mobile terminals assigned to the priority sub-band, the cell base station sends a plurality of Interference Avoidance Requests (IAR) to the base stations of the adjacent interfering cells for the edge mobile terminals, and requests the interfering base stations to reduce the sending power on the same frequency sub-band.
The specific process is as follows:
base station of cell i according to average signal-to-interference ratio of edge mobile terminal
All edge mobile terminals are divided into Q (Q is a positive integer, generally, Q is more than or equal to 2 and less than or equal to 10, and the parameter is determined in network planning) levels. The average signal-to-interference ratio interval of the Q (Q ═ 1, 2.. Q) th level edge terminal is [ gamma ]q-1，γq]，γqIs defined as:
where g (γ) is the edge mobile terminal average signal-to-interference ratio
Is defined as:
on each priority subband, the level 1 edge terminal with the lowest average signal-to-interference ratio is allowed to use Imax(ImaxThe upper limit of the number of IARs allowed to be used by each edge terminal is a positive integer, and generally, I is more than or equal to 5max≦ 50, this parameter is determined at network planning) IARs. In two adjacent stages, m (m is the difference of the allowed numbers of IAR used by the edge terminal at the lower stage compared with the edge terminal at the higher stage, the value is a positive integer, generally 1 ≦ m ≦ 10, and the parameter is determined during network planning) IAR, the allowed number of IAR used by the edge terminal at the Q (Q ═ 1, 2.. Q) stage is max {0, I ≦ Q)max-m × (q-1) }. Wherein, each IAR represents that the corresponding interference base station is requested to reduce epsilon dB (epsilon is the power value reduced by each interference avoidance request, and is generally more than 0 epsilon and less than or equal to 10, and the parameter is determined during network planning) on the corresponding interference avoidance subcarrier.
For example, in cell 1, let Q be 2, δ be 5, [ γ ═ y [ Q ] ]0，γ1，γ2]＝[0，1，5]，Imax20, 5 and 3. If the average signal-to-interference ratio of an edge mobile terminal belonging to cell 1 is 2, andand is assigned to priority subband 2. Then the edge mobile terminal belongs to level 2 edge mobile terminal, which allows to use max {0, 20-5 × (2-1) } 15 IARs on priority subband 2. The base station sends a total of 15 IARs to the adjacent interfering cells {2, 3, 4, 5, 6, 7} for the edge mobile terminals requesting them to reduce the transmit power on subband 2 in each cell. Where each IAR indicates a request to the corresponding cell base station to reduce its transmit power by 3dB on subband 2.
6. And after each cell base station receives the interference avoidance request, reducing corresponding transmitting power on corresponding interference avoidance sub-bands.
The specific process is as follows:
let aiThe sequence number of the interference avoidance sub-band of the cell i is shown, and the cell i is positioned in the interference avoidance sub-band aiThe number of IARs received over cell j isThen cell i will be in the interference avoidance subband aiUpper reduction
The transmission power.
Wherein, <math>
<mrow>
<msub>
<mi>K</mi>
<msub>
<mi>a</mi>
<mi>i</mi>
</msub>
</msub>
<mo>=</mo>
<munder>
<mi>max</mi>
<mrow>
<mi>j</mi>
<mo>∈</mo>
<msub>
<mi>BS</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<msub>
<mi>a</mi>
<mi>i</mi>
</msub>
</mrow>
</msub>
</mrow>
</munder>
<msub>
<mi>K</mi>
<mrow>
<mi>j</mi>
<mo>,</mo>
<msub>
<mi>a</mi>
<mi>i</mi>
</msub>
</mrow>
</msub>
<mo>,</mo>
</mrow>
</math> indicating an interference avoidance subband a towards cell iiThe set of cell sequence numbers of the IAR is sent.
Thus, cell i is in interference avoidance sub-band aiTransmit power of
Comprises the following steps:
for example, assuming cell 1 is on subband 2, the number of IARs received from cells {2, 4, 6} are: 3, 5 and 4. Then, the transmission power P of the cell 1 on the interference avoidance subband 21，2Comprises the following steps:
P1，2＝Pmax-(5×εdB)
when the cell base station transmits data through a downlink, the cell base station transmits data to the mobile terminal according to the sub-band allocated to the mobile terminal and the corresponding transmission power, and the mobile terminal receives the data at the same time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A dynamic fractional frequency reuse method based on OFDMA wireless cellular networks, characterized in that it comprises the steps of:
step 1, uniformly dividing frequency resources which can be used by each cell of the OFDMA wireless cellular network into a plurality of sub-bands, wherein each sub-band is called a sub-band, classifying the sub-bands into a public sub-band, a priority sub-band and an interference avoidance sub-band, and the transmission power of the public sub-band and the priority sub-band is constant to the maximum transmission power P on each sub-bandmaxTransmitting power P of interference avoidance sub-bandIASBIs a variable in that it is,its value range is P is more than or equal to 0IASB≤Pmax；
And 2, planning sub-bands by each cell: each cell selects a part of sub-bands as a public sub-band of the cell, then selects a part of sub-bands as a priority sub-band of the cell, and selects the rest sub-bands as interference avoidance sub-bands of the cell, wherein the following conditions are met in the selection process: all cells select subbands with the same frequency as a common subband of the cell, adjacent cells select subbands with different frequencies as priority subbands of the cell, and the common subbands and the priority subbands of each cell are arranged in a comb shape on a frequency axis;
step 3, on the public sub-band, the mobile terminal measures the useful signal intensity from the cell and the interference signal intensity from the adjacent cells around, the mobile terminal feeds back the information to the cell base station, and the cell base station divides the mobile terminal into a central mobile terminal or an edge mobile terminal according to the information fed back by the mobile terminal;
step 4, the base station of the cell allocates the sub-band to the mobile terminal according to the division information of the mobile terminal, the edge mobile terminal is allowed to be allocated to all types of sub-bands, but the central mobile terminal is only allowed to be allocated to a public sub-band and an interference avoidance sub-band;
step 5, for the edge mobile terminal distributed to the priority sub-band, the cell base station sends an interference avoidance request to the base stations of the adjacent interference cells for the edge mobile terminal, and requests the interference base stations to reduce the sending power on the same frequency sub-band;
and 6, after each cell base station receives the interference avoidance request, reducing corresponding transmitting power on corresponding interference avoidance sub-bands.
2. The dynamic fractional frequency reuse method according to claim 1, wherein step 3 comprises the following processes:
step 3.1 with i, j representing the serial numbers of two different cells, uiIndicating the number of mobile terminals in cell i, ciIndicating the sequence number of the common sub-band in the cell i; common subband c in cell iiUpper, mobile terminaluiMeasuring useful signal strength from own cell
And interfering signal strength from surrounding neighbor cell j
Mobile terminal uiWill be provided with
And
feeding back to the base station of the cell i;
step 3.2 base station of cell i according to mobile terminal uiWith feedbackAnd
calculating the mobile terminal u using the formulaiIn the common sub-band ciSignal to interference ratio of
Wherein J represents the total number of cells in the cellular network;
step 3.3 base station acquisition of cell i
Then, the mobile terminal u is estimated by using the following formulaiAverage signal-to-interference ratio over all sub-bands
Wherein A isCSB，iSet representing common subband sequence numbers in cell i, NCSB，iRepresenting the total number of common subbands in cell i;
the base station of step 3.4 cell i will average the signal to interference ratioComparing with a preset edge mobile terminal division threshold delta if
Then the mobile terminal u is connected toiDivision into central mobile terminals, otherwise the mobile terminal uiDivided into edge mobile terminals.
3. The dynamic fractional frequency reuse method according to claim 2, wherein step 5 comprises the following processes:
step 5.1 base station of cell i according to average signal-to-interference ratio of edge mobile terminalDividing all edge mobile terminals into Q levels according to a preset Q value, wherein the average signal-to-interference ratio interval of the Q level edge terminal is
Is defined as:
wherein g (γ) is edgeAverage signal-to-interference ratio of mobile terminal
Is defined as:
step 5.2, on each priority subband, according to the preset upper limit value I of the number of the interference avoidance requests allowed to be used by each edge terminalmaxSetting the number of the interference avoidance requests allowed to be used by the level 1 edge terminal with the lowest average signal-to-interference ratio as Imax(ii) a In the adjacent two-stage edge terminals, according to a preset interference avoidance request number difference m value, the number of interference avoidance requests allowed to be used more by the edge terminal at the lower stage than the edge terminal at the higher stage is set as m; the number of the interference avoidance requests allowed to be used by the q-th-level edge terminal is max {0, Imax-m × (q-1) }; and according to the preset power value epsilon reduced by each interference avoidance request, each interference avoidance request indicates that the corresponding interference base station is requested to reduce epsilon dB sending power on the corresponding interference avoidance subcarrier.
4. The dynamic fractional frequency reuse method according to claim 3, wherein step 6 comprises the following processes:
step 6.1 order aiThe sequence number of the interference avoidance sub-band of the cell i is shown, and the cell i is positioned in the interference avoidance sub-band aiThe number of interference avoidance requests received from cell j isCalculating the interference avoidance sub-band a of the cell iiUp reduced transmission power having a value of
Wherein,
indicating an interference avoidance subband a towards cell iiSending a set of cell sequence numbers of interference avoidance requests;
step 6.2, setting the cell i in an interference avoidance sub-band aiAt a transmission power of
The value of the transmission power is
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| KR20140017575A (en) | 2011-04-13 | 2014-02-11 | 엘지전자 주식회사 | Method for sending and receiving signals for alleviating inter-cell interference in a wireless communication system and a device therefor |
| WO2013044486A1 (en) * | 2011-09-29 | 2013-04-04 | 富士通株式会社 | Method and apparatus for allocating frequency resources |
| CN102843699B (en) * | 2012-08-17 | 2015-02-18 | 天津大学 | Wireless transmission method under application scenes of macro base stations and family base stations |
| US10085154B2 (en) | 2012-10-17 | 2018-09-25 | Huawei Technologies Co., Ltd. | System and method for dynamic inter-cell interference coordination |
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