CN102625336B - Interference management method and device in heterogenous network - Google Patents

Abstract

The invention discloses an interference management method and a device in a heterogenous network. The method comprises the steps of determining respectively reference signal received quality (RSRQ) of base stations and RSRQ of low-power nodes, comparing the ratio between the RSRQ of the base stations and the RSRQ of the low-power nodes with a set threshold value, and performing an interference management on user equipment (UE) in accordance with a comparison result. The method and the device can reduce remarkably interference among cells through resource allocation, power control and configuration of control channels on the premise that communication quality of the base stations and the low-power nodes is guaranteed, guarantee the support for downward compatible/non-downward compatible UE by setting all resource element (RE) control channel information on a main carrier/auxiliary carrier, implement a novel UE cell selection and switch strategy through RSRQ reference values of the base stations and the low-power nodes so as to prevent low-power node auxiliary (or service) UE from being reduced remarkably, and, through a RSRQ weighting mode, solve the problem of interference among the cells caused by the fact that resource elements of control channels cannot perform effective power control when spreading all over system bandwidths.

Description

Interference management method and device in heterogeneous network

Technical field

The present invention relates to interference management techniques, particularly relate to interference management method and device in a kind of heterogeneous network.

Background technology

In NGBW communication network, how to support that more large bandwidth becomes the key factor improving inter-cell user terminal throughput and user terminal average throughput.

At present, at the Long Term Evolution (LTE of third generation partner program, Long Term Evolution) propose in system to adopt the mode of carrier aggregation to support larger bandwidth, to meet the demand to the index such as throughput, peak rate in new generation of wireless standard.Carrier aggregation supports the key technology of more large bandwidth in future broadband wireless communication systems, it is by being polymerized different carrier waves, form the carrier wave of more large bandwidth, bandwidth is after polymerisation supported the subscriber equipment (UE, User Equipment) with stronger ability.Such as, support the bandwidth more than 100MHz in enhancement mode Long Term Evolution (LTE-Advanced, Long Term Evolution-Advanced) system.

Based in the heterogeneous network system of carrier aggregation, interference management faces three major issues:

(1), in heterogeneous network, low power nodes mainly refers to the such as transmitting power low network node more remarkable in macro base station such as remote radio node (RRH, Remote Radio Head), Pico cell Node, Home eNodeB, via node.For outdoor deployment scenario 9-26dB lower than macro base station, for indoor deployment scene 26dB lower than macro base station, therefore, the UE of low power nodes service will be subject to the severe jamming with the macrocell of its covering area overlapping;

(2) current, in typical heterogeneous network, community is selected to be that UE attached (or service) namely has the community of the strongest received signal strength in the strongest service signal community with the rule of access.Because low power nodes transmitting power is very low, therefore, UE prioritizing selection will be made, be linked into macrocell, thus the UE of low power nodes attached (or service) is significantly reduced, and then coverage is significantly reduced;

(3) traditional interference management or avoiding method and strategy can not be applied to control channel, main cause is, Resource Unit (the RE of formation control channel, Resource Element) (namely physical control format indicator channel (PCFICH, Physical Control Format Indicator CHannel), physical downlink control channel (PDCCH, Physical Downlink Control CHannel), Physical HARQ Indicator Channel (PHICH, Physical Hybrid-ARQ Indicator CHannel)) spread all over whole system bandwidth.

There is no the related art scheme solving above-mentioned technical problem at present.

Summary of the invention

In view of this, main purpose of the present invention is to provide interference management method and device in a kind of heterogeneous network, can notify that UE carry out preferably community selection and switch, carry out resource and power division or control channel information for base station and low power nodes carry according to current channel quality status.

For achieving the above object, technical scheme of the present invention is achieved in that

Interference management method in a kind of heterogeneous network, comprising:

Determine the RSRQ of base station, low power nodes respectively, the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold are compared, according to comparative result, interference management is carried out to user equipment (UE).

Preferably, the described RSRQ determining base station, low power nodes respectively, for:

Determine RSRP and RSSI of base station, low power nodes respectively, determine the ratio of RSRP and RSSI of base station, low power nodes further respectively, by described ratio and the Physical Resource Block PRB sum N required for transmission _pRBthe long-pending RSRQ respectively as base station, low power nodes.

Preferably, determine the RSRP of base station, low power nodes, for:

The linear average P of all Resource Unit RE received powers of the cell reference signals in the reception bandwidth determining base station, low power nodes respectively on two time slots _rS, and obtain the path loss PL that described UE reports respectively, with P _rSwith the long-pending RSRP respectively as base station, low power nodes of PL;

Determine the RSSI of base station, low power nodes, for:

The average transmit power P of PRB on two time slots in the reception bandwidth determining base station, low power nodes respectively _pRB, by P _pRB, N _pRB, PL makes Lian Jihou, with the OFDM symbol number N in PRB _symboldo business, using quotient as base station, the RSSI of low power nodes.

Preferably, described method also comprises:

To P _rS, P _pRBbe weighted normalized, for: $P_{\mathrm{RS}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\mathrm{\δ}\left(i\right)\×P_{\mathrm{RS}}\left(i\right))/N,$ $P_{\mathrm{PRB}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\∂\left(i\right)\×P_{\mathrm{PRB}}\left(i\right))/N,$ Wherein, N is the total number of timeslots in setting-up time frame, δ (i), be respectively P in each time slot _rSand P _pRBweights; δ (i), adjust according to load balancing, presence of intercell interference, coverage and set;

The described RSRQ determining base station, low power nodes respectively, for:

With the P after weighting normalization process _rS, P _pRBdetermine the RSRQ of base station, low power nodes.

Preferably, described setting threshold comprises switching threshold, resource and power division threshold value;

Described interference management comprises community and selects to carry with switching, resource and power division or control channel information;

Described the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold to be compared, according to comparative result, interference management is carried out to UE, for:

According to the comparing result of the RSRQ of base station and the RSRQ ratio of low power nodes and setting threshold and the interference management strategy that presets, determine corresponding interference management mode.

Preferably, described interference management strategy comprises:

Be greater than switching threshold, carry out cell merge;

When being less than or equal to switching threshold and being greater than first resource and power division threshold value, when carrier wave supports backward compatibility, link control channel information sends on whole RE, and when carrier wave does not support backward compatibility, link control channel information sends on whole RE of main component carrier;

Be less than or equal to first resource and power division threshold value when being greater than Secondary resource and power division threshold value, when carrier wave supports backward compatibility, the RE that link control channel information is launched in whole full power sends, when carrier wave does not support backward compatibility, whole RE of the main component carrier that link control channel information is launched in whole full power send;

Be less than or equal to Secondary resource and power division threshold value when being greater than information resources and power division threshold value, when carrier wave supports backward compatibility, the RE that the link control channel information of base station is launched in full power sends, and the link control channel information of low power nodes sends on the RE of non-full power emission; When carrier wave does not support backward compatibility, the link control channel information of base station sends on the RE of non-full power emission, and the RE that the link control channel information of low power nodes is launched in full power sends.

Preferably, described interference management strategy comprises:

The carrier resource of base station or low power nodes be orthogonal and/or accurate orthogonal time launch with full power, nonopiate and/or orthogonal and/or accurate orthogonal time to reduce power emission.

Interference management device in a kind of heterogeneous network, comprises determining unit, comparing unit and interference management unit, wherein:

Determining unit, determines the RSRQ of base station, low power nodes respectively;

Comparing unit, for comparing the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold;

Interference management unit, for carrying out interference management according to comparative result to UE.

Preferably, described determining unit also for, determine RSRP and RSSI of base station, low power nodes respectively, determine the ratio of RSRP and RSSI of base station, low power nodes further respectively, by described ratio and the PRB sum N required for transmission _pRBthe long-pending RSRQ respectively as base station, low power nodes.

Preferably, described determining unit is also for, the linear average P of all RE received powers of the cell reference signals in the reception bandwidth determining base station, low power nodes respectively on two time slots _rS, and obtain the path loss PL that described UE reports respectively, with P _rSwith the long-pending RSRP respectively as base station, low power nodes of PL;

The average transmit power P of PRB on two time slots in the reception bandwidth determining base station, low power nodes respectively _pRB, by P _pRB, N _pRB, PL makes Lian Jihou, with the OFDM symbol number N in PRB _symboldo business, using quotient as base station, the RSSI of low power nodes.

Preferably, described device also comprises:

Weighting normalization processing unit, for P _rS, P _pRBbe weighted normalized, for: $P_{\mathrm{RS}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\mathrm{\δ}\left(i\right)\×P_{\mathrm{RS}}\left(i\right))/N,$ $P_{\mathrm{PRB}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\∂\left(i\right)\×P_{\mathrm{PRB}}\left(i\right))/N,$ Wherein, N is the total number of timeslots in setting-up time frame, δ (i), be respectively P in each time slot _rSand P _pRBweights; δ (i), adjust according to load balancing, presence of intercell interference, coverage and set;

Described determining unit also for, with the P after weighting normalization process _rS, P _pRBdetermine the RSRQ of base station, low power nodes.

Preferably, described setting threshold comprises switching threshold, resource and power division threshold value;

Described interference management comprises community and selects to carry with switching, resource and power division or control channel information;

Described interference management unit also for, according to the comparing result of the RSRQ of base station and the RSRQ ratio of low power nodes and setting threshold and the interference management strategy that presets, determine corresponding interference management mode.

Preferably, described interference management strategy comprises:

Be greater than switching threshold, carry out cell merge;

When being less than or equal to switching threshold and being greater than first resource and power division threshold value, when carrier wave supports backward compatibility, link control channel information sends on whole RE, and when carrier wave does not support backward compatibility, link control channel information sends on whole RE of main component carrier;

Be less than or equal to first resource and power division threshold value when being greater than Secondary resource and power division threshold value, when carrier wave supports backward compatibility, the RE that link control channel information is launched in whole full power sends, when carrier wave does not support backward compatibility, whole RE of the main component carrier that link control channel information is launched in whole full power send;

Be less than or equal to Secondary resource and power division threshold value when being greater than information resources and power division threshold value, when carrier wave supports backward compatibility, the RE that the link control channel information of base station is launched in full power sends, and the link control channel information of low power nodes sends on the RE of non-full power emission; When carrier wave does not support backward compatibility, the link control channel information of base station sends on the RE of non-full power emission, and the RE that the link control channel information of low power nodes is launched in full power sends;

And/or, the carrier resource of base station or low power nodes be orthogonal and/or accurate orthogonal time launch with full power, nonopiate and/or orthogonal and/or accurate orthogonal time to reduce power emission.

In the present invention, determine base station (BS respectively, Base Station), the Reference Signal Received Quality (RSRQ of low power nodes, Reference Signal Receiving Quality), the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold are compared, according to comparative result, interference management is carried out to user equipment (UE).Interference management of the present invention comprises community and selects to carry with switching, resource and power division or control channel information; According to the comparing result of the RSRQ of base station and the RSRQ ratio of low power nodes and setting threshold and the interference management strategy that presets, determine corresponding interference management mode.

The present invention is controlled by Resourse Distribute, power, the configuration of control channel, under the prerequisite guaranteeing base station and low power nodes communication quality, can significantly reduce the interference of minizone; By the setting to RE control channel information all on primary/secondary carrier wave, ensure that the support for backward compatibility/non-backward compatible UE; Implement Xin UE community by the RSRQ reference value of base station, low power nodes to select and switchover policy, the UE avoiding low power nodes attached (or service) significantly reduces; The Resource Unit solving control channel by the mode of RSRQ weighting cannot carry out effective power control when spreading all over whole system bandwidth, and then causes the problem of presence of intercell interference.

Accompanying drawing explanation

Fig. 1 is the flow chart of interference management method in the heterogeneous network of the embodiment of the present invention;

Fig. 2 is the composition structural representation of interference management device in heterogeneous network of the invention process.

Embodiment

Basic thought of the present invention is: the RSRQ determining base station, low power nodes respectively, the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold is compared, carries out interference management according to comparative result to user equipment (UE).

Fig. 1 is the flow chart of interference management method in the heterogeneous network of the embodiment of the present invention, and as shown in Figure 1, in the heterogeneous network of this example, interference management method specifically comprises the following steps:

Step 101, determines the RSRQ of base station, low power nodes respectively.

Here, first RSRQ is simply introduced.RSRQ needs by reference to Signal reception power (RSRP, Reference Signal Receiving Power) and received signal strength indicator (RSSI, Received Signal Strength Indicator) determine, wherein, RSRP for carrying the mean value of the signal power that all RE of reference signal (Reference Signal) receive in certain Symbol, RSSI is then that all signals received in this Symbol (comprise pilot signal and data-signal, adjacent area interference signal, noise signal etc.) mean value of power, RSRQ is then the ratio of RSRP and RSSI.Due to RSRP with RSSI when measuring institute based on bandwidth possible different, a coefficient can be used to adjust the ratio of RSRP and RSSI, as RSRQ.

How the RSRQ below describing the embodiment of the present invention in detail determines.

Can be determined by the computing formula shown in formula (1) for 3GPP LTE, RSRQ.

V _RSRQ＝V _RSRP×N _PRB/V _RSSI (1)

Wherein, V _rSRQfor Reference Signal Received Quality RSRQ value to be determined, V _rSRPfor Reference Signal Received Power RSRP, N _pRBfor Physical Resource Block (PRB, Physical Resource Block) required in downlink transfer sum, V _rSSIfor carrier received signal intensity instruction RSSI.

Following formula (2) shows the computing formula of RSRP.

V _RSRP＝P _RS×PL (2)

Wherein, P _rSfor in system acceptance bandwidth, the linear averaging of each reference signal resource unit (RS-RE, the Reference Signal Resource Element) received power of corresponding cell reference signals on two time slots.PL is path loss, and wherein, PL value is measured by UE and reported.

Formula (3) shows V _rSSIcomputing formula.

V _RSSI＝(P _PRB×N _PRB×PL)/N _Symbol (3)

Wherein, P _pRBfor PRB average transmit power on two time slots in system acceptance bandwidth; N _symbolfor the OFDM symbol number on each PRB.

Formula (2) and (3) are substituted into formula (1) can obtain:

V _RSRQ＝(P _RS×N _Symbol)/P _PRB (4)

Consider that the RE of control channel spreads all over whole system bandwidth, therefore, the embodiment of the present invention also will to P _rSand P _pRBbe weighted normalized, namely respectively by following formula (5), (6) respectively to the above-mentioned P calculated _rS, P _pRBcarry out respective handling:

$P_{\mathrm{RS}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\mathrm{\δ}\left(i\right)\×P_{\mathrm{RS}}\left(i\right))/N---\left(5\right)$

$P_{\mathrm{PRB}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\∂\left(i\right)\×P_{\mathrm{PRB}}\left(i\right))/N---\left(6\right)$

Wherein, N is the total number of timeslots in setting-up time frame, δ (i), be respectively P in each time slot _rSand P _pRBweights, method to set up can be, when the equal continuous distribution of all RE, δ (i), be 1, time all discontinuously arranged, δ (i), be 0.1.δ, can be identical, also can be different, can set respectively.Due to rule of thumb to δ (i), carrying out setting is be very easy to realize, and the embodiment of the present invention no longer provides other setting means.Also can according to the demand in system between BS and low power nodes, as dynamic conditioning δ (i) such as load balancing, presence of intercell interference, coverage adjustment, size.

Use T _sHrepresent the BS of weighting, the RSRQ reference value of low power nodes of the embodiment of the present invention, have:

T _SH＝V _RSRQ-BS/V _RSRQ-LP (7)

Wherein, in formula (7), V _rSRQ-BSfor the RSRQ value of BS, V _rSRQ-LPfor the RSRQ value of low power nodes, subscript BS represents base station, and subscript LP represents low power nodes.

Above-mentioned formula (4), (5), (6) are substituted into formula (7) and can obtain:

$T_{\mathrm{SH}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}({\mathrm{\δ}}_{\mathrm{BS}}\left(i\right)\×P_{\mathrm{RS}-\mathrm{BS}}\left(i\right)\×{\∂}_{\mathrm{LP}}\left(i\right)\×P_{\mathrm{PRB}-\mathrm{LP}}\left(i\right))/\underset{i=1}{\overset{N}{\mathrm{\Σ}}}({\mathrm{\δ}}_{\mathrm{LP}}\left(i\right)\×P_{\mathrm{RS}-\mathrm{LP}}\left(i\right)\×{\∂}_{\mathrm{BS}}\left(i\right)\×P_{\mathrm{PRB}-\mathrm{BS}}\left(i\right))---\left(8\right)$

Step 102, compares the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold.

The T that above-mentioned formula (8) is determined _sHbe the RSRQ of base station and the RSRQ ratio of low power nodes.In embodiments of the invention, the RSRQ of the base station after non-weighting and the RSRQ ratio of low power nodes also can be used as the basis of interference management.

After determining the RSRQ of base station and the RSRQ ratio of low power nodes, compare with the threshold value set in advance.

The setting means of threshold value is specifically determined according to the regulatory requirement of operator, and the mode of setting threshold has a variety of.Below by way of an example, illustrate threshold value of the present invention and how to set, this example is not intended to limit the setting means of threshold value.

Assuming that set threshold value has four, is respectively: T _sH-Handoverand T _sH-RP1, T _sH-RP2, T _sH-RP3, T _sH-Handoverrepresent switching threshold, T _sH-RPrepresent resource and power division threshold value, T _sH-RP1, T _sH-RP2, T _sH-RP3represent the grade of carrying out resource and power division institute foundation respectively, the relation of above-mentioned threshold value is T _sH-Handover> T _sH-RP1> T _sH-RP2> T _sH-RP3.

Step 103, carries out interference management according to comparative result to user equipment (UE).

Table 1 shows T _sHthe example that the interference management strategy corresponding with setting threshold comparative result is also BS, the community selection of low power nodes to UE carries with switching, resource and power division, control channel information.

Table 1

In table 1, compatible indicating device mainly refers to an access base station, whether the UE of low power nodes supports backward compatibility.In embodiments of the invention, when UE is backward compatibility, BS, low power nodes determine the backward compatibility characteristic of carrier wave according to the control channel information that carrier wave carries, when UE is non-backward compatible, whole carrier wave is set to non-backward compatible by BS, low power nodes, to guarantee that UE is correctly linked into BS, low power nodes.Table 2 describes the set-up mode of the compatible indicating device (CC) of carrier wave of the embodiment of the present invention.

CC	RB1～4	RB5～12	RB13	RB14～17	RB18～20
						Backward compatibility	0	1	0	0	1
Non-backward compatible	0	0	0	0	0

Table 2

Wherein, 0 to represent the compatible indicating device of carrier wave be non-backward compatible, and 1 to represent the compatible indicating device of carrier wave be backward compatibility.Meanwhile, when primary/secondary component carrier is arranged, main component carrier is configured to the CC that compatible indicating device is 0 value, for backward compatibility, auxiliary component carrier can be configured to the CC that compatible indicating device is 0/1 value, and for non-backward compatible, auxiliary component carrier can only be configured to the CC that compatible indicating device is 0 value.

In addition, the embodiment of the present invention BS, low power nodes arranges resource and power distribution strategies is as shown in table 3.

Table 3

In table 3,0 represents orthogonal or accurate orthogonal, and 1 represents that nonopiate or non-standard is orthogonal.In above-mentioned 00,01,10,11, a bit position corresponds to base station, is used to indicate carrier wave in base station whether orthogonal or accurate orthogonal, and the 2nd bit position corresponds to low power nodes, is used to indicate carrier wave in low power nodes whether orthogonal or accurate orthogonal.

Low power nodes is as transmitting power low network nodes more remarkable in macro base station such as remote radio node, Pico cell Node, Home eNodeB, via nodes.

Fig. 2 is the composition structural representation of interference management device in the heterogeneous network of the embodiment of the present invention, as shown in Figure 2, and interference management device determining unit 20, comparing unit 21 and interference management unit 22 in the heterogeneous network of the embodiment of the present invention, wherein:

Determining unit 20, determines the RSRQ of base station, low power nodes respectively;

Comparing unit 21, for comparing the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold;

Interference management unit 22, for carrying out interference management according to comparative result to UE.

Wherein, described determining unit 20 also for, determine RSRP and RSSI of base station, low power nodes respectively, determine the ratio of RSRP and RSSI of base station, low power nodes further respectively, by described ratio and the PRB sum N required for transmission _pRBthe long-pending RSRQ respectively as base station, low power nodes.

Wherein, described determining unit 20 is also for, the linear average P of all RE received powers of the cell reference signals in the reception bandwidth determining base station, low power nodes respectively on two time slots _rS, and obtain the path loss PL that described UE reports respectively, with P _rSwith the long-pending RSRP respectively as base station, low power nodes of PL; And, the average transmit power P of PRB on two time slots in the reception bandwidth determining base station, low power nodes respectively _pRB, by P _pRB, N _pRB, PL makes Lian Jihou, with the OFDM symbol number N in PRB _symboldo business, using quotient as base station, the RSSI of low power nodes.

In the heterogeneous network of the embodiment of the present invention, interference management device also comprises:

Weighting normalization processing unit 23, for P _rS, P _pRBbe weighted normalized, for: $P_{\mathrm{RS}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\mathrm{\δ}\left(i\right)\×P_{\mathrm{RS}}\left(i\right))/N,$ $P_{\mathrm{PRB}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}(\∂\left(i\right)\×P_{\mathrm{PRB}}\left(i\right))/N,$ Wherein, N is the total number of timeslots in setting-up time frame, δ (i), be respectively P in each time slot _rSand P _pRBweights; δ (i), adjust according to load balancing, presence of intercell interference, coverage and set;

Described determining unit 20 also for, with the P after weighting normalization process _rS, P _pRBdetermine the RSRQ of base station, low power nodes.

Those skilled in the art are to be understood that, above-mentioned weighting normalization processing unit 23 is technical scheme for optimizing interference management device in heterogeneous network of the present invention and arranges, and is not the necessary technology means of interference management device in the heterogeneous network realizing the embodiment of the present invention.

Above-mentioned setting threshold comprises switching threshold, resource and power division threshold value;

Described interference management comprises community and selects to carry with switching, resource and power division or control channel information;

Described interference management unit 22 also for, according to the comparing result of the RSRQ of base station and the RSRQ ratio of low power nodes and setting threshold and the interference management strategy that presets, determine corresponding interference management mode.

Wherein, above-mentioned interference management strategy comprises:

Be greater than switching threshold, carry out cell merge;

When being less than or equal to switching threshold and being greater than first resource and power division threshold value, when carrier wave supports backward compatibility, link control channel information sends on whole RE, and when carrier wave does not support backward compatibility, link control channel information sends on whole RE of main component carrier;

Be less than or equal to first resource and power division threshold value when being greater than Secondary resource and power division threshold value, when carrier wave supports backward compatibility, the RE that link control channel information is launched in whole full power sends, when carrier wave does not support backward compatibility, whole RE of the main component carrier that link control channel information is launched in whole full power send;

Be less than or equal to Secondary resource and power division threshold value when being greater than information resources and power division threshold value, when carrier wave supports backward compatibility, the RE that the link control channel information of base station is launched in full power sends, and the link control channel information of low power nodes sends on the RE of non-full power emission; When carrier wave does not support backward compatibility, the link control channel information of base station sends on the RE of non-full power emission, and the RE that the link control channel information of low power nodes is launched in full power sends.

Or above-mentioned interference management strategy comprises: the carrier resource of base station or low power nodes be orthogonal and/or accurate orthogonal time launch with full power, nonopiate and/or orthogonal and/or accurate orthogonal time to reduce power emission.

Interference management strategy shown in above-mentioned can be combined.

In the embodiment of the present invention, above-mentioned low power nodes is as transmitting power low network nodes more remarkable in macro base station such as remote radio node, Pico cell Node, Home eNodeB, via nodes.

It will be appreciated by those skilled in the art that the practical function of each processing unit in the heterogeneous network shown in Fig. 2 in interference management device can refer to the associated description of interference management method in aforementioned heterogeneous network and understands.It will be appreciated by those skilled in the art that the function of each processing unit in interference management device in the heterogeneous network shown in Fig. 2 realizes by the program run on processor, also realize by concrete logical circuit.

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (8)

1. an interference management method in heterogeneous network, is characterized in that, described method comprises:

Determine the Reference Signal Received Quality RSRQ of base station, low power nodes respectively, the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold are compared, according to comparative result, interference management is carried out to user equipment (UE); Wherein, described setting threshold comprises switching threshold, resource and power division threshold value;

Described interference management comprises community and selects to carry with switching, resource and power division or control channel information;

Described the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold to be compared, according to comparative result, interference management is carried out to UE, for:

According to the comparing result of the RSRQ of base station and the RSRQ ratio of low power nodes and setting threshold and the interference management strategy that presets, determine corresponding interference management mode; Wherein, described interference management strategy comprises:

Be greater than switching threshold, carry out cell merge;

When being less than or equal to switching threshold and being greater than first resource and power division threshold value, when carrier wave supports backward compatibility, link control channel information sends on whole RE, and when carrier wave does not support backward compatibility, link control channel information sends on whole RE of main component carrier;

Be less than or equal to first resource and power division threshold value when being greater than Secondary resource and power division threshold value, when carrier wave supports backward compatibility, the RE that link control channel information is launched in whole full power sends, when carrier wave does not support backward compatibility, whole RE of the main component carrier that link control channel information is launched in whole full power send;

Be less than or equal to Secondary resource and power division threshold value when being greater than information resources and power division threshold value, when carrier wave supports backward compatibility, the RE that the link control channel information of base station is launched in full power sends, and the link control channel information of low power nodes sends on the RE of non-full power emission; When carrier wave does not support backward compatibility, the link control channel information of base station sends on the RE of non-full power emission, and the RE that the link control channel information of low power nodes is launched in full power sends;

And/or, the carrier resource of base station or low power nodes be orthogonal and/or accurate orthogonal time launch with full power, nonopiate and/or orthogonal and/or accurate orthogonal time to reduce power emission.

2. method according to claim 1, is characterized in that, the described RSRQ determining base station, low power nodes respectively, for:

Determine base station, the Reference Signal Received Power RSRP of low power nodes and received signal strength indicator RSSI respectively, determine the ratio of RSRP and RSSI of base station, low power nodes further respectively, by described ratio and the Physical Resource Block PRB sum N required for transmission _pRBthe long-pending RSRQ respectively as base station, low power nodes.

3. method according to claim 2, is characterized in that, determines the RSRP of base station, low power nodes, for:

The linear average P of all Resource Unit RE received powers of the cell reference signals in the reception bandwidth determining base station, low power nodes respectively on two time slots _rS, and obtain the path loss PL that described UE reports respectively, with P _rSwith the long-pending RSRP respectively as base station, low power nodes of PL;

Determine the RSSI of base station, low power nodes, for:

The average transmit power P of PRB on two time slots in the reception bandwidth determining base station, low power nodes respectively _pRB, by P _pRB, N _pRB, PL makes Lian Jihou, with the OFDM symbol number N in PRB _symboldo business, using quotient as base station, the RSSI of low power nodes.

4. method according to claim 3, is characterized in that, described method also comprises:

To P _rS, P _pRBbe weighted normalized, for: wherein, N is the total number of timeslots in setting-up time frame, δ (i), i () is respectively P in each time slot _rSand P _pRBweights; δ (i), i () adjusts according to load balancing, presence of intercell interference, coverage and sets;

The described RSRQ determining base station, low power nodes respectively, for:

With the P after weighting normalization process _rS, P _pRBdetermine the RSRQ of base station, low power nodes.

5. an interference management device in heterogeneous network, is characterized in that, described device comprises determining unit, comparing unit and interference management unit, wherein:

Determining unit, determines the RSRQ of base station, low power nodes respectively;

Comparing unit, for comparing the RSRQ ratio of the RSRQ of base station and low power nodes and setting threshold;

Interference management unit, for carrying out interference management according to comparative result to UE;

Wherein, described setting threshold comprises switching threshold, resource and power division threshold value;

Described interference management comprises community and selects to carry with switching, resource and power division or control channel information;

Described interference management unit also for, according to the comparing result of the RSRQ of base station and the RSRQ ratio of low power nodes and setting threshold and the interference management strategy that presets, determine corresponding interference management mode; Wherein, described interference management strategy comprises:

Be greater than switching threshold, carry out cell merge;

When being less than or equal to switching threshold and being greater than first resource and power division threshold value, when carrier wave supports backward compatibility, link control channel information sends on whole RE, and when carrier wave does not support backward compatibility, link control channel information sends on whole RE of main component carrier;

Be less than or equal to first resource and power division threshold value when being greater than Secondary resource and power division threshold value, when carrier wave supports backward compatibility, the RE that link control channel information is launched in whole full power sends, when carrier wave does not support backward compatibility, whole RE of the main component carrier that link control channel information is launched in whole full power send;

Be less than or equal to Secondary resource and power division threshold value when being greater than information resources and power division threshold value, when carrier wave supports backward compatibility, the RE that the link control channel information of base station is launched in full power sends, and the link control channel information of low power nodes sends on the RE of non-full power emission; When carrier wave does not support backward compatibility, the link control channel information of base station sends on the RE of non-full power emission, and the RE that the link control channel information of low power nodes is launched in full power sends;

And/or, the carrier resource of base station or low power nodes be orthogonal and/or accurate orthogonal time launch with full power, nonopiate and/or orthogonal and/or accurate orthogonal time to reduce power emission.

6. device according to claim 5, it is characterized in that, described determining unit also for, determine RSRP and RSSI of base station, low power nodes respectively, determine the ratio of RSRP and RSSI of base station, low power nodes further respectively, by described ratio and the PRB sum N required for transmission _pRBthe long-pending RSRQ respectively as base station, low power nodes.

7. device according to claim 6, is characterized in that, described determining unit is also for, the linear average P of all RE received powers of the cell reference signals in the reception bandwidth determining base station, low power nodes respectively on two time slots _rS, and obtain the path loss PL that described UE reports respectively, with P _rSwith the long-pending RSRP respectively as base station, low power nodes of PL;

The average transmit power P of PRB on two time slots in the reception bandwidth determining base station, low power nodes respectively _pRB, by P _pRB, N _pRB, PL makes Lian Jihou, with the OFDM symbol number N in PRB _symboldo business, using quotient as base station, the RSSI of low power nodes.

8. device according to claim 7, is characterized in that, described device also comprises:

Weighting normalization processing unit, for P _rS, P _pRBbe weighted normalized, for: wherein, N is the total number of timeslots in setting-up time frame, δ (i), i () is respectively P in each time slot _rSand P _pRBweights; δ (i), i () adjusts according to load balancing, presence of intercell interference, coverage and sets;

Described determining unit also for, with the P after weighting normalization process _rS, P _pRBdetermine the RSRQ of base station, low power nodes.