CN103476035A - Method for inter-cell interference coordination based on subframe alignment on TD-LTE-A heterogeneous network - Google Patents

Abstract

The invention discloses a method for inter-cell interference coordination based on subframe alignment on a TD-LTE-A heterogeneous network. The method for inter-cell interference coordination based on subframe alignment on the TD-LTE-A heterogeneous network comprises the steps that (1) a macro base station divides mobile terminals into mobile terminals in two areas according to received signal interference noise ratios of the mobile terminals within the coverage area, when the received signal interference noise ratio of each mobile terminal is larger than a threshold value gamma, the mobile terminal is placed into an internal area, and when the signal interference noise ratio of each received mobile terminal is smaller than the threshold value gamma, the mobile terminal is placed into an external area; (2) available frequency bands are divided into two parts, and the power of reserved frequency bands is 1/N of the power of distributable frequency bands; (3) the distributable frequency bands are distributed to the mobile terminals in the external area for use, and the reserved frequency bands are distributed to the mobile terminals in the internal area for use; (4) a micro base station divides the available frequency bands into distributable frequency bands and reserved frequency bands, the reserved frequency bands are distributed to mobile terminals in a wireless signal extension range area, and the distributable frequency bands are distributed to mobile terminals in a non-extension range area. The method for inter-cell interference coordination based on subframe alignment on the TD-LTE-A heterogeneous network reduces interference of the mobile terminals in an extension area of the range of the micro base station, improves the signal interference noise ratio of a system, and increases throughput of the system.

Description

Inter-cell interference coordination method for the TD-LTE-A heterogeneous network based on the subframe alignment

Technical field

The present invention relates to a kind of inter-cell interference coordination method alignd based on subframe for the TD-LTE-A heterogeneous network, belong to network communications technology field.

Background technology

In order to promote the overall performance of network, be conceived to improve the spectrum efficiency in per unit zone, heterogeneous network is proposed by LTE-A standardization body, has become one of key technology of considering in the LTE-A standard formulation.Heterogeneous network adopts the base node of different radio access technologies to form by some, and they have different capacity, constraints and function.In the LTE-A system, traditional macrocellular can newly add far-end radio node (RRH) and some low power nodes under covering, as comprises Pico cell, Home eNodeB and relaying.The deployment of new node can effectively alleviate the macrocellular load, improve the covering quality of specific region, improve the performance of edge customer.

The introducing of heterogeneous network is faced with some allowed important technical challenges such as self-organizing, self-optimizing, backhaul design, switching, presence of intercell interference, and wherein due to network topology structure, to change the problem of inter-cell interference bring particularly important.Under macrocellular and microcellulor scene, the terminal use in the macrocell edge can cause larger uplink interference to micro-base station.Scope expansion technique (Range Expansion) has solved this problem by the macrocell edge customer is accessed to micro-base station, has enlarged the coverage of micro-base station.But this technology has also increased the descending interference of the macro base station that the Microcell edge customer is subject to simultaneously, and side-play amount is larger, and the impact of interference is more obvious.

For this reason, need a kind of effective method, overcome the shortcoming of above scope expansion technique, reduce the descending interference that Microcell edge termination user is subject to, improve the total capacity of system.

Summary of the invention

Goal of the invention: with not enough, the invention provides a kind of inter-cell interference coordination method alignd based on subframe for the TD-LTE-A heterogeneous network for problems of the prior art, to reduce the interference of scope expansion area intra domain user, improve power system capacity.

Technical scheme: a kind of inter-cell interference coordination method alignd based on subframe for the TD-LTE-A heterogeneous network comprises following step:

The first step: the macro base station utilization in network

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\ζL}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{macro}}}{{\mathrm{\ξP}}_{\mathrm{macro}}+{\mathrm{\ψ\σ}}^2+P_{m\_\mathrm{interfer}}+P_{p\_\mathrm{interfer}}}$ [rule 1]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage.L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected macro base station (m=0) and the large scale between interference base station.ζ and ξ mean channel estimation errors, and ψ means the enhancing noise of ZF receiver, σ ²mean receiver noise.

Or directly obtain the Signal to Interference plus Noise Ratio size of reception.

Macro base station basis in [rule 1]

$P_{m\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{macro}}-1}{\mathrm{\Σ}}}{\mathrm{\θL}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 2]

Calculate and disturb the interference size of macro base station to the terminal in coverage.N wherein _macrothe sum that means macro base station, P _macromean the power of macro base station, θ means interference factor.

Macro base station basis in [rule 1]

$P_{p\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{pico}}}{\mathrm{\Σ}}}{\mathrm{\θL}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 3]

Calculate and disturb the interference size of micro-base station to the terminal in coverage.N wherein _picothe sum that means micro-base station, P _picothe power that means micro-base station.

Second step: macro base station, according to the size of the Signal to Interference plus Noise Ratio of the terminal in coverage, is divided into two zones by terminal, and an area judging threshold value γ is set, the macro base station basis in interior zone and perimeter

SINR _i>=γ [rule 4]

Terminal in the judgement coverage is divided into perimeter, otherwise is divided into interior zone.

The 3rd step: but macro base station is divided into allocated frequency band and reserved frequency band two parts by available band, according to

BW _reserved=β * BW _all[rule 5]

Calculate the size of reserved frequency band in available band.BW wherein _reservedmean reserved frequency band, BW _allmean available band, β means the frequency band division factor.

Macro base station basis in [rule 5]

$\mathrm{\β}=\frac{N_{\mathrm{RE}}}{N_{\mathrm{total}}}$ [rule 6]

Calculate the size of the frequency band division factor.N wherein _rEmean the number of terminals in the scope extended area of micro-base station, N _totaltotal number of terminals in the expression system.The angle of power, the macro base station basis

P _reserved=(1/N) P _macro[rule 7]

Calculate the watt level of reserved frequency band.Wherein N means that power reduces the factor, P _macrothe power that means macro base station, but the watt level of allocated frequency band also meaned.But macro base station is distributed to the perimeter terminal by allocated frequency band and is used, and will reserve bandwidth assignment and use to the interior zone terminal.

The 4th step: the micro-base station in network utilizes

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{pico}}}{{\mathrm{\&xi;P}}_{\mathrm{pico}}+{\mathrm{\&psi;\&sigma;}}^2+{\mathrm{<figure-callout\; id="2"\; label="P\; m"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_m+{\mathrm{<figure-callout\; id="2"\; label="P\; p"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_p}$ [rule 8]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage.L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected micro-base station (m=0) and the large scale between interference base station.Micro-base station basis in [rule 8]

${\mathrm{<figure-callout\; id="2"\; label="P\; m"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_m=\underset{m}{\overset{N_{\mathrm{macro}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 9]

Calculate and disturb the interference of macro base station to the terminal in coverage.Micro-base station basis in [rule 8]

${\mathrm{<figure-callout\; id="2"\; label="P\; p"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_p=\underset{m}{\overset{N_{\mathrm{pico}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 10]

Calculate and disturb the interference of micro-base station to the terminal in coverage.

The 5th step: but the micro-base station in network is divided into allocated frequency band and reserved frequency band by available band, by reserved bandwidth assignment to the terminal in the scope extended area, but allocated frequency band is distributed to the terminal in non-scope extended area.

The 6th step: the macro base station in network sends blank frame in the even frame of reserved frequency band.

Beneficial effect: compared with prior art, the inter-cell interference coordination method alignd based on subframe for the TD-LTE-A heterogeneous network provided by the invention, by coordinating time, frequency, the power resource of macro base station and micro-base station, effectively reduce the interference of macro base station to terminal use in Microcell scope extended area, improved the total throughout of system.

The accompanying drawing explanation

The flow chart that Fig. 1 is the embodiment of the present invention;

The network structure that Fig. 2 is the embodiment of the present invention.

Embodiment

Below in conjunction with specific embodiment, further illustrate the present invention, should understand these embodiment only is not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.

Embodiment mono-

Construct as shown in Figure 2 a TD-LTE-A network, one has 7 communities, and each community comprises 3 sectors, and 4 Microcells are arranged in each sector, and the frequency duplex factor as one of minizone is 1.Each Physical Resource Block bandwidth is 180kHz, and the distance between neighbor cell is 500 meters.In this example, each sector is uniform-distribution with 30 users.Other important parameters in system are as shown in table 1 below:

System parameters in table 1: embodiment mono-

The first step: the macro base station utilization in network

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{macro}}}{{\mathrm{\&xi;P}}_{\mathrm{macro}}+{\mathrm{\&psi;\&sigma;}}^2+P_{m\_\mathrm{interfer}}+P_{p\_\mathrm{interfer}}}$ [rule 1]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage.L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected macro base station (m=0) and the large scale between interference base station.ζ and ξ mean channel estimation errors, and ψ means the enhancing noise of ZF receiver, σ ²mean receiver noise.Macro base station basis in [rule 1]

$P_{m\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{macro}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 2]

Calculate and disturb the interference size of macro base station to the terminal in coverage.N wherein _macrothe sum that means macro base station, P _macromean the power of macro base station, θ means interference factor.Macro base station basis in [rule 1]

$P_{p\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{pico}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 3]

Calculate and disturb the interference size of micro-base station to the terminal in coverage.N wherein _picothe sum that means micro-base station, P _picothe power that means micro-base station.

As shown in Figure 1: second step: macro base station, according to the size of the Signal to Interference plus Noise Ratio of the terminal in coverage, is divided into two zones by terminal, and an area judging threshold value γ is set, the macro base station basis in interior zone and perimeter

SINR _i>=γ [rule 4]

Terminal in the judgement coverage is divided into perimeter, otherwise is divided into interior zone.

The 3rd step: but macro base station is divided into allocated frequency band and reserved frequency band two parts by available band, according to

BW _reserved=β * BW _all[rule 5]

Calculate the size of reserved frequency band in available band.BW wherein _reservedmean reserved frequency band, BW _allmean available band, β means the frequency band division factor.Macro base station basis in [rule 5]

$\mathrm{\&beta;}=\frac{N_{\mathrm{RE}}}{N_{\mathrm{total}}}$ [rule 6]

Calculate the size of the frequency band division factor.N wherein _rEmean the number of terminals in the scope extended area of micro-base station, N _totaltotal number of terminals in the expression system.The angle of power, the macro base station basis

P _reserved=(1/N) P _macro[rule 7]

Calculate the watt level of reserved frequency band.Wherein N means that power reduces the factor, P _macrothe power that means macro base station, but the watt level of allocated frequency band also meaned.But macro base station is distributed to the perimeter terminal by allocated frequency band and is used, and will reserve bandwidth assignment and use to the interior zone terminal.

The 4th step: the micro-base station in network utilizes

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{pico}}}{{\mathrm{\&xi;P}}_{\mathrm{pico}}+{\mathrm{\&psi;\&sigma;}}^2+{\mathrm{<figure-callout\; id="2"\; label="P\; m"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_m+{\mathrm{<figure-callout\; id="2"\; label="P\; p"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_p}$ [rule 8]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage.L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected micro-base station (m=0) and the large scale between interference base station.Micro-base station basis in [rule 8]

${\mathrm{<figure-callout\; id="2"\; label="P\; m"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_m=\underset{m}{\overset{N_{\mathrm{macro}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 9]

Calculate and disturb the interference of macro base station to the terminal in coverage.Micro-base station basis in [rule 8]

${\mathrm{<figure-callout\; id="2"\; label="P\; p"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_p=\underset{m}{\overset{N_{\mathrm{pico}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 10]

Calculate and disturb the interference of micro-base station to the terminal in coverage.

The 5th step: but the micro-base station in network is divided into allocated frequency band and reserved frequency band by available band, by reserved bandwidth assignment to the terminal in the scope extended area, but allocated frequency band is distributed to the terminal in non-scope extended area.

The 6th step: the macro base station in network sends blank frame in the even frame of reserved frequency band.

Embodiment bis-

Construct as shown in Figure 2 a TD-LTE-A network, one has 7 communities, and each community comprises 3 sectors, and 2 Microcells are arranged in each sector, and the frequency duplex factor as one of minizone is 1.Each Physical Resource Block bandwidth is 180kHz, and the distance between neighbor cell is 500 meters.In this example, each sector is uniform-distribution with 20 users.Other important parameters in system are as shown in table 2 below:

System parameters in table 2: embodiment bis-

The first step: the macro base station utilization in network

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{macro}}}{{\mathrm{\&xi;P}}_{\mathrm{macro}}+{\mathrm{\&psi;\&sigma;}}^2+P_{m\_\mathrm{interfer}}+P_{p\_\mathrm{interfer}}}$ [rule 1]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage.L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected macro base station (m=0) and the large scale between interference base station.ζ and ξ mean channel estimation errors, and ψ means the enhancing noise of ZF receiver, σ ²mean receiver noise.Macro base station basis in [rule 1]

$P_{m\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{macro}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 2]

Calculate and disturb the interference size of macro base station to the terminal in coverage.N wherein _macrothe sum that means macro base station, P _macrothe power that means macro base station, θ means to disturb.Macro base station basis in [rule 1]

$P_{p\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{pico}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 3]

Calculate and disturb the interference size of micro-base station to the terminal in coverage.N wherein _picothe sum that means micro-base station, P _picothe power that means micro-base station.

As shown in Figure 1, second step: macro base station, according to the size of the Signal to Interference plus Noise Ratio of the terminal in coverage, is divided into two zones by terminal, and an area judging threshold value γ is set, the macro base station basis in interior zone and perimeter

SINR _i>=γ [rule 4]

Terminal in the judgement coverage is divided into perimeter, otherwise is divided into interior zone.

The 3rd step: but macro base station is divided into allocated frequency band and reserved frequency band two parts by available band, according to

BW _reserved=β * BW _all[rule 5]

Calculate the size of reserved frequency band in available band.BW wherein _reservedmean reserved frequency band, BW _allmean available band, β means the frequency band division factor.Macro base station basis in [rule 5]

$\mathrm{\&beta;}=\frac{N_{\mathrm{RE}}}{N_{\mathrm{total}}}$ [rule 6]

Calculate the size of the frequency band division factor.N wherein _rEmean the number of terminals in the scope extended area of micro-base station, N _totaltotal number of terminals in the expression system.The angle of power, the macro base station basis

P _reserved=(1/N) P _macro[rule 7]

Calculate the watt level of reserved frequency band.Wherein N means that power reduces the factor, P _macrothe power that means macro base station, but the watt level of allocated frequency band also meaned.But macro base station is distributed to the perimeter terminal by allocated frequency band and is used, and will reserve bandwidth assignment and use to the interior zone terminal.

The 4th step: the micro-base station in network utilizes

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{pico}}}{{\mathrm{\&xi;P}}_{\mathrm{pico}}+{\mathrm{\&psi;\&sigma;}}^2+{\mathrm{<figure-callout\; id="2"\; label="P\; m"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_m+{\mathrm{<figure-callout\; id="2"\; label="P\; p"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_p}$ [rule 8]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage.L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected micro-base station (m=0) and the large scale between interference base station.Micro-base station basis in [rule 8]

${\mathrm{<figure-callout\; id="2"\; label="P\; m"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_m=\underset{m}{\overset{N_{\mathrm{macro}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 9]

Calculate and disturb the interference of macro base station to the terminal in coverage.Micro-base station basis in [rule 8]

${\mathrm{<figure-callout\; id="2"\; label="P\; p"\; filenames="HDA0000380567040000021.png"\; state="\{\{state\}\}">P</figure-callout>}}_p=\underset{m}{\overset{N_{\mathrm{pico}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 10]

Calculate and disturb the interference of micro-base station to the terminal in coverage.

The 5th step: but the micro-base station in network is divided into allocated frequency band and reserved frequency band by available band, by reserved bandwidth assignment to the terminal in the scope extended area, but allocated frequency band is distributed to the terminal in non-scope extended area.

The 6th step: the macro base station in network sends blank frame in the even frame of reserved frequency band.

Claims (7)

1. the inter-cell interference coordination method alignd based on subframe for the TD-LTE-A heterogeneous network, is characterized in that, the method periodically repeats following step:

The first step: the macro base station in network calculates and disturbs macro base station to the interference size of the terminal in coverage and disturb the interference size of micro-base station to the terminal in coverage, thereby further calculates the size of the Signal to Interference plus Noise Ratio of the terminal in coverage; Simultaneously, macro base station is divided into two zones by terminal, interior zone and perimeter, set a fixed gate limit value γ, carry out zoning, if the Signal to Interference plus Noise Ratio of terminal is greater than threshold value γ, this terminal is divided into to interior zone, if the Signal to Interference plus Noise Ratio of terminal is less than γ, this terminal is divided into to perimeter;

Second step: but the macro base station in network is divided into allocated frequency band and reserved frequency band two parts by available band, calculates the size of reserved frequency band in available band according to the frequency band division factor, calculates the watt level of reserved frequency band; But macro base station is distributed to the perimeter terminal by allocated frequency band and is used, and will reserve bandwidth assignment and use to the interior zone terminal;

The 3rd step: the micro-base station in network is according to disturbing macro base station to the interference size of the terminal in coverage and disturbing micro-base station the interference size of the terminal in coverage to be calculated to the size of the Signal to Interference plus Noise Ratio of terminal in coverage; But simultaneously micro-base station is divided into allocated frequency band and reserved frequency band by available band, by reserved bandwidth assignment to the terminal in wireless signal spreading range zone, but allocated frequency band is distributed to the terminal in the unextended range zone;

The 4th step: the macro base station in network sends blank frame in the even frame of reserved frequency band;

The Inter-Cell Interference Coordination process of at every turn aliging based on subframe is that the even multiples in each system cycle of operation repeats the above first step to the four steps.

As claimed in claim 1 for the TD-LTE-A heterogeneous network inter-cell interference coordination method based on subframe alignment, it is characterized in that: macro base station calculate the terminal in coverage Signal to Interference plus Noise Ratio size or directly obtain the size of the Signal to Interference plus Noise Ratio of reception;

Macro base station basis wherein

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{macro}}}{{\mathrm{\&xi;P}}_{\mathrm{macro}}+{\mathrm{\&psi;\&sigma;}}^2+P_{m\_\mathrm{interfer}}+P_{p\_\mathrm{interfer}}}$ [rule 1]

Calculate the size of the Signal to Interference plus Noise Ratio of terminal in coverage; L _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected macro base station (m=0) and the large scale between interference base station; ζ and ξ mean channel estimation errors, and ψ means the enhancing noise of ZF receiver, σ ²mean receiver noise;

The macro base station basis

$P_{m\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{macro}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 2]

Calculate and disturb the interference size of macro base station to the terminal in coverage, N _macrothe sum that means macro base station, P _macromean the power of macro base station, θ means interference factor;

The macro base station basis

$P_{p\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{pico}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$ [rule 3]

Calculate and disturb the interference size of micro-base station to the terminal in coverage, N _picothe sum that means micro-base station, P _picothe power that means micro-base station.

As claimed in claim 2 for the TD-LTE-A heterogeneous network inter-cell interference coordination method based on subframe alignment, it is characterized in that:

The macro base station basis

SINR _i>=γ [rule 4]

Terminal in the judgement coverage is divided into perimeter, otherwise is divided into interior zone.

As claimed in claim 3 for the TD-LTE-A heterogeneous network inter-cell interference coordination method based on subframe alignment, it is characterized in that:

The macro base station basis

BW _reserved=β * BW _all[rule 5]

Calculate the size of reserved frequency band in available band; BW wherein _reservedmean reserved frequency band, BW _allmean available band, β means the frequency band division factor;

The macro base station basis

$\mathrm{\&beta;}=\frac{N_{\mathrm{RE}}}{N_{\mathrm{total}}}$ [rule 6]

Calculate the size of the frequency band division factor; N wherein _rEmean the number of terminals in the scope extended area of micro-base station, N _totaltotal number of terminals in the expression system.

As claimed in claim 4 for the TD-LTE-A heterogeneous network inter-cell interference coordination method based on subframe alignment, it is characterized in that:

The macro base station basis

P _reserved=(1/N) P _macro[rule 7]

Calculate the watt level of reserved frequency band; Wherein N means that power reduces the factor, P _macrothe power that means macro base station, but the watt level of allocated frequency band also meaned.

As claimed in claim 5 for the TD-LTE-A heterogeneous network inter-cell interference coordination method based on subframe alignment, it is characterized in that:

Micro-base station basis

$\mathrm{SIN}{R}_i=\frac{{\mathrm{\&zeta;L}}_{\mathrm{MP},0,i}{L}_{\mathrm{SF},0,i}{P}_{\mathrm{pico}}}{{\mathrm{\&xi;P}}_{\mathrm{pico}}+{\mathrm{\&psi;\&sigma;}}^2+P_{m2\_\mathrm{interfer}}+P_{p2\_\mathrm{interfer}}}$ [rule 8] calculates the size of the Signal to Interference plus Noise Ratio of terminal in coverage; L wherein _{mP, m, i}with L _{sF, m, i}mean that respectively terminal i declines and shadow fading be connected micro-base station (m=0) and the large scale between interference base station;

Micro-base station basis

$P_{m2\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{macro}}}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{macro}}$ [rule 9]

Calculate and disturb the interference of macro base station to the terminal in coverage;

Micro-base station basis

$P_{p2\_\mathrm{interfer}}=\underset{m}{\overset{N_{\mathrm{pico}}-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;L}}_{\mathrm{MP},m,i}{L}_{\mathrm{SF},m,i}{P}_{\mathrm{pico}}$

[rule 10] calculated and disturbed the interference of micro-base station to the terminal in coverage.

As claimed in claim 1 for the TD-LTE-A heterogeneous network inter-cell interference coordination method based on subframe alignment, it is characterized in that: the even multiples of each system cycle of operation specifically refers to j*TTI (j=2,4....), TTI is Transmission Time Interval in the LTE system.

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