CN102625336A - 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 the heterogeneous network

Technical field

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

Background technology

In the NGBW communication network, how to support bigger bandwidth to become the key factor that improves inter-cell user terminal throughput and user terminal average throughput.

At present, in Long Term Evolution (LTE, the Long Term Evolution) system of third generation partner program, propose to adopt the mode of carrier aggregation to support bigger bandwidth, to satisfy in the new generation of wireless standard demand to indexs such as throughput, peak rates.Carrier aggregation is to support the key technology of bigger bandwidth in the future broadband wireless communication systems; It is through carrying out polymerization to different carrier waves; Form the carrier wave of bigger bandwidth, on the bandwidth after the polymerization, support to have the subscriber equipment (UE, User Equipment) of stronger ability.For example support to surpass the bandwidth of 100MHz in enhancement mode Long Term Evolution (LTE-Advanced, the Long Term Evolution-Advanced) system.

In the heterogeneous network system based on carrier aggregation, interference management faces three major issues:

(1) in the heterogeneous network, low power nodes mainly is meant such as radio frequency and zooms out transmitting powers such as node (RRH, Remote Radio Head), Pico sub-district node, Home eNodeB, via node than the remarkable low network node of macro base station.Than the low 9-26dB of macro base station, than the low 26dB of macro base station, therefore, the UE of low power nodes service will receive the serious interference with the macrocell of its covering area overlapping for the indoor deployment scene for outdoor deployment scenario;

(2) present, in the typical heterogeneous network, the rule of cell selecting and access is UE attached (or service) promptly has the strongest reception signal strength signal intensity in the strongest service signal sub-district sub-district.Because the low power nodes transmitting power is very low, therefore, will make UE preferentially select, be linked into macrocell, thereby the UE of low power nodes attached (or service) is significantly reduced, and then the coverage is significantly reduced;

(3) traditional interference management or avoiding method and strategy can not be applied to control channel; Main cause is; Form the Resource Unit (RE of control channel; Resource Element) (just physical control format identifies 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 bandwidths.

Still there is not at present the related art scheme that solves above-mentioned technical problem.

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 carry out preferable cell selecting and switching according to current channel quality status notice UE, be that base station and low power nodes are carried out resource and power division or control channel information carrying.

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

Interference management method in a kind of heterogeneous network comprises:

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

Preferably, the said RSRQ that confirms base station, low power nodes respectively, for:

Confirm the RSRP and the RSSI of base station, low power nodes respectively, further confirm base station, the RSRP of low power nodes and the ratio of RSSI respectively, with the needed Physical Resource Block PRB sum of said ratio and transmission N _PRBIntegration not as the RSRQ of base station, low power nodes.

Preferably, confirm 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 on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _RS, and obtain the path loss PL that said UE reports respectively, with P _RSWith the integration of PL not as the RSRP of base station, low power nodes;

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

The average transmit power P of PRB on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _PRB, with P _PRB, N _PRB, PL makes Lian Jihou, with the OFDM symbolic number N among the PRB _SymbolDiscuss, with quotient respectively as the RSSI of base station, low power nodes.

Preferably, said method also comprises:

To P _RS, P _PRBCarry out weighting normalization and handle, 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 time slot sum in the setting-up time frame, δ (i),

Be respectively P in each time slot _RSAnd P _PRBWeights; δ (i),

Set according to load balancing, presence of intercell interference, coverage adjustment;

The said RSRQ that confirms base station, low power nodes respectively, for:

With the P after the weighting normalization processing _RS, P _PRBConfirm the RSRQ of base station, low power nodes.

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

Said interference management comprises cell selecting and switching, resource and power division or control channel information carrying;

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

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

Preferably, said interference management strategy comprises:

Greater than switching threshold, carry out the sub-district and switch;

Smaller or equal to switching threshold during greater than first resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information is all sending on the RE, and when carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of main composition carrier wave;

Smaller or equal to first resource and power division threshold value during greater than second resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information sends on the RE of all full power emissions; When carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of master's composition carrier wave of all full power emissions;

Smaller or equal to second resource and power division threshold value during greater than information resources and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information of base station sends on the RE of full power emission, and the controlling links channel information of low power nodes sends on the RE of non-full power emission; When carrier wave was not supported backward compatibility, the controlling links channel information of base station sent on the RE of non-full power emission, and the controlling links channel information of low power nodes sends on the RE of full power emission.

Preferably, said interference management strategy comprises:

Launch with full power when the carrier resource of base station or low power nodes is quadrature and/or accurate quadrature, when nonopiate and/or quadrature and/or accurate quadrature to reduce power emission.

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

Confirm the unit, confirm the RSRQ of base station, low power nodes respectively;

Comparing unit is used for the RSRQ of base station and the RSRQ ratio and the setting threshold of low power nodes are compared;

The interference management unit is used for according to comparative result UE being carried out interference management.

Preferably, said definite unit also is used for, and confirms the RSRP and the RSSI of base station, low power nodes respectively, further confirms base station, the RSRP of low power nodes and the ratio of RSSI respectively, with the needed PRB sum of said ratio and transmission N _PRBIntegration not as the RSRQ of base station, low power nodes.

Preferably, said definite unit also is used for, the linear average P of all RE received powers of the cell reference signals on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _RS, and obtain the path loss PL that said UE reports respectively, with P _RSWith the integration of PL not as the RSRP of base station, low power nodes;

The average transmit power P of PRB on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _PRB, with P _PRB, N _PRB, PL makes Lian Jihou, with the OFDM symbolic number N among the PRB _SymbolDiscuss, with quotient respectively as the RSSI of base station, low power nodes.

Preferably, said device also comprises:

Weighting normalization processing unit is used for P _RS, P _PRBCarry out weighting normalization and handle, 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 time slot sum in the setting-up time frame, δ (i),

Be respectively P in each time slot _RSAnd P _PRBWeights; δ (i),

Set according to load balancing, presence of intercell interference, coverage adjustment;

Said definite unit also is used for, the P after handling with weighting normalization _RS, P _PRBConfirm the RSRQ of base station, low power nodes.

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

Said interference management comprises cell selecting and switching, resource and power division or control channel information carrying;

Said interference management unit also is used for, and according to RSRQ and the RSRQ ratio of low power nodes and the comparing result and the predefined interference management strategy of setting threshold of base station, confirms corresponding interference management mode.

Preferably, said interference management strategy comprises:

Greater than switching threshold, carry out the sub-district and switch;

Smaller or equal to switching threshold during greater than first resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information is all sending on the RE, and when carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of main composition carrier wave;

Smaller or equal to first resource and power division threshold value during greater than second resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information sends on the RE of all full power emissions; When carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of master's composition carrier wave of all full power emissions;

Smaller or equal to second resource and power division threshold value during greater than information resources and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information of base station sends on the RE of full power emission, and the controlling links channel information of low power nodes sends on the RE of non-full power emission; When carrier wave was not supported backward compatibility, the controlling links channel information of base station sent on the RE of non-full power emission, and the controlling links channel information of low power nodes sends on the RE of full power emission;

And/or, launch with full power when the carrier resource of base station or low power nodes is quadrature and/or accurate quadrature, when nonopiate and/or quadrature and/or accurate quadrature to reduce power emission.

Among the present invention; Confirm base station (BS respectively; Base Station), the Reference Signal Received Quality (RSRQ of low power nodes; Reference Signal Receiving Quality), the RSRQ of base station and the RSRQ ratio and the setting threshold of low power nodes are compared, user equipment (UE) is carried out interference management according to comparative result.Interference management of the present invention comprises cell selecting and switching, resource and power division or control channel information carrying; According to RSRQ and the RSRQ ratio of low power nodes and the comparing result and the predefined interference management strategy of setting threshold of base station, confirm corresponding interference management mode.

The present invention can significantly reduce the interference of minizone through the configuration of resource allocation, power control, control channel under the prerequisite of guaranteeing base station and low power nodes communication quality; Through setting, guaranteed support for backward compatibility/non-backward compatible UE to all RE control channel information on the primary/secondary carrier wave; RSRQ reference value through base station, low power nodes is implemented new UE cell selecting and switchover policy, has avoided the UE of low power nodes attached (or service) significantly to reduce; The Resource Unit that mode through the RSRQ weighting has solved control channel can't carry out effective power control when spreading all over whole system bandwidth, and then causes the problem of presence of intercell interference.

Description of drawings

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

Fig. 2 is the composition structural representation of interference management device in the heterogeneous network of the present invention's enforcement.

Embodiment

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

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

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

Here, at first RSRQ is carried out brief account.RSRQ need pass through Reference Signal Received Power (RSRP; Reference Signal Receiving Power) and receive signal strength signal intensity indication (RSSI; Confirm that Received Signal Strength Indicator) wherein, RSRP is for carrying the mean value of the signal power that receives on all RE of reference signal (Reference Signal) in certain Symbol; RSSI then is that all signals that in this Symbol, receive (comprise pilot signal and data-signal; Adjacent area interference signal, noise signal etc.) mean value of power, RSRQ then is the ratio of RSRP and RSSI.Since RSRP and RSSI when measuring based on bandwidth possible different, can use a coefficient to adjust the ratio of RSRP and RSSI, as RSRQ.

How the RSRQ that below describes the embodiment of the invention in detail confirms.

For 3GPP LTE, RSRQ can be confirmed by the computing formula shown in the formula (1).

V _RSRQ＝V _RSRP×N _PRB/V _RSSI (1)

Wherein, V _RSRQBe Reference Signal Received Quality RSRQ value to be determined, V _RSRPBe Reference Signal Received Power RSRP, N _PRBBe needed Physical Resource Block in the downlink transfer (PRB, Physical Resource Block) sum, V _RSSIFor carrier wave receives signal strength signal intensity indication RSSI.

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

V _RSRP＝P _RS×PL (2)

Wherein, P _RSFor in system receives bandwidth, the linear averaging of each reference signal resource unit (RS-RE, Reference Signal Resource Element) received power of corresponding cell reference signals on two time slots.PL is a path loss, and wherein, the 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 receive in the bandwidth PRB average transmit power on two time slots in system; N _SymbolBe the OFDM symbolic number on each PRB.

Formula (2) and (3) substitution formula (1) can be got:

V _RSRQ＝(P _RS×N _Symbol)/P _PRB (4)

The RE that considers control channel spreads all over whole system bandwidths, and therefore, the embodiment of the invention also will be to P _RSAnd P _PRBCarry out weighting normalization and handle the P that promptly respectively aforementioned calculation is gone out by following formula (5), (6) respectively _RS, P _PRBCarry out handled:

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

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

Wherein, N is the time slot sum in the setting-up time frame, δ (i), Be respectively P in each time slot _RSAnd P _PRBWeights, method to set up can for, when all equal continuous distribution of RE, δ (i),

Be 1, when all discontinuously arranged, δ (i),

Be 0.1.δ,

can be identical; Also can be different, can set respectively.Because rule of thumb δ (i),

being set is to realize that very easily the embodiment of the invention no longer provides other setting means.Also can dynamically adjust the size of δ (i), like load balancing, presence of intercell interference, coverage adjustment etc. according to the demand between BS in the system and low power nodes.

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

T _SH＝V _RSRQ-BS/V _RSRQ-LP (7)

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

Above-mentioned formula (4), (5), (6) substitution formula (7) can be got:

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

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

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

After determining the RSRQ ratio of RSRQ and low power nodes of base station, compare with prior preset threshold.

The setting means of threshold value specifically be regulatory requirement according to operator and definite, the mode of setting threshold has a variety of.Below through an example, illustrate threshold value of the present invention and how to set, this example is not the setting means that is used to limit threshold value.

Suppose, set threshold value have four, be respectively: T _SH-HandoverAnd T _SH-RP1, T _SH-RP2, T _SH-RP3, T _SH-HandoverRepresent switching threshold, T _SH-RPExpression resource and power division threshold value, T _SH-RP1, T _SH-RP2, T _SH-RP3The grade of resource and power division institute foundation is carried out in expression respectively, and the relation of above-mentioned threshold value is T _SH-Handover＞T _SH-RP1＞T _SH-RP2＞T _SH-RP3

Step 103 is carried out interference management according to comparative result to user equipment (UE).

Table 1 shows T _SHThe interference management strategy corresponding with the setting threshold comparative result also is the example that BS, low power nodes are carried cell selecting and switching, resource and power division, the control channel information of UE.

Table 1

In the table 1, compatible indicating device is meant mainly whether the UE of access base station, low power nodes supports backward compatibility.In the embodiments of the invention; When UE is backward compatibility; BS, low power nodes are confirmed the backward compatibility characteristic of carrier wave according to the control channel information of carrying on the carrier wave; When UE was non-backward compatible, BS, the whole carrier waves of low power nodes were set to non-backward compatible, correctly were linked into BS, low power nodes to guarantee UE.Table 2 has been explained the set-up mode of the compatible indicating device of carrier wave (CC) of the embodiment of the 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 represent carrier wave compatibility indicating device be backward compatibility.Simultaneously, when primary/secondary composition carrier wave was provided with, the main carrier wave of forming was configured to the CC that compatible indicating device is 0 value; For backward compatibility; The auxilliary carrier wave of forming can be configured to the CC that compatible indicating device is 0/1 value, and for non-backward compatible, the auxilliary carrier wave of forming can only be configured to the CC that compatible indicating device is 0 value.

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

Table 3

In the table 3,0 expression quadrature or accurate quadrature, the nonopiate or non-accurate quadrature of 1 expression.A bit position is corresponding to the base station in above-mentioned 00,01,10,11, is used for indicating base station carrier wave whether quadrature or accurate quadrature, and the 2nd bit position is corresponding to low power nodes, is used for indicating low power nodes carrier wave whether quadrature or accurate quadrature.

Low power nodes is for to zoom out transmitting powers such as node, Pico sub-district node, Home eNodeB, via node than the remarkable low network node of macro base station like radio frequency.

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

Confirm unit 20, confirm the RSRQ of base station, low power nodes respectively;

Comparing unit 21 is used for the RSRQ of base station and the RSRQ ratio and the setting threshold of low power nodes are compared;

Interference management unit 22 is used for according to comparative result UE being carried out interference management.

Wherein, said definite unit 20 also is used for, and confirms the RSRP and the RSSI of base station, low power nodes respectively, further confirms base station, the RSRP of low power nodes and the ratio of RSSI respectively, with the needed PRB sum of said ratio and transmission N _PRBIntegration not as the RSRQ of base station, low power nodes.

Wherein, said definite unit 20 also is used for, the linear average P of all RE received powers of the cell reference signals on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _RS, and obtain the path loss PL that said UE reports respectively, with P _RSWith the integration of PL not as the RSRP of base station, low power nodes; And, the average transmit power P of PRB on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _PRB, with P _PRB, N _PRB, PL makes Lian Jihou, with the OFDM symbolic number N among the PRB _SymbolDiscuss, with quotient respectively as the RSSI of base station, low power nodes.

The interference management device also comprises in the heterogeneous network of the embodiment of the invention:

Weighting normalization processing unit 23 is used for P _RS, P _PRBCarry out weighting normalization and handle, 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 time slot sum in the setting-up time frame, δ (i), Be respectively P in each time slot _RSAnd P _PRBWeights; δ (i),

Set according to load balancing, presence of intercell interference, coverage adjustment;

Said definite unit 20 also is used for, the P after handling with weighting normalization _RS, P _PRBConfirm 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 for the technical scheme of optimizing interference management device in the heterogeneous network of the present invention is provided with, and is not to be the necessary technology means that realize interference management device in the heterogeneous network of the embodiment of the invention.

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

Said interference management comprises cell selecting and switching, resource and power division or control channel information carrying;

Said interference management unit 22 also is used for, and according to RSRQ and the RSRQ ratio of low power nodes and the comparing result and the predefined interference management strategy of setting threshold of base station, confirms corresponding interference management mode.

Wherein, above-mentioned interference management strategy comprises:

Greater than switching threshold, carry out the sub-district and switch;

Smaller or equal to switching threshold during greater than first resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information is all sending on the RE, and when carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of main composition carrier wave;

Smaller or equal to first resource and power division threshold value during greater than second resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information sends on the RE of all full power emissions; When carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of master's composition carrier wave of all full power emissions;

Smaller or equal to second resource and power division threshold value during greater than information resources and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information of base station sends on the RE of full power emission, and the controlling links channel information of low power nodes sends on the RE of non-full power emission; When carrier wave was not supported backward compatibility, the controlling links channel information of base station sent on the RE of non-full power emission, and the controlling links channel information of low power nodes sends on the RE of full power emission.

Perhaps, above-mentioned interference management strategy comprises: launch with full power when the carrier resource of base station or low power nodes is quadrature and/or accurate quadrature, when nonopiate and/or quadrature and/or accurate quadrature to reduce power emission.

Interference management strategy shown in above-mentioned can be used in combination.

In the embodiment of the invention, above-mentioned low power nodes is for to zoom out transmitting powers such as node, Pico sub-district node, Home eNodeB, via node than the remarkable low network node of macro base station like radio frequency.

The realization function that it will be appreciated by those skilled in the art that each processing unit in the interference management device in the heterogeneous network shown in Fig. 2 can be with reference to the associated description of interference management method in the aforementioned heterogeneous network and is understood.It will be appreciated by those skilled in the art that in the heterogeneous network shown in Figure 2 that the function of each processing unit can realize through the program that runs on the processor in the interference management device, also can realize through concrete logical circuit.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims (13)

1. interference management method in the heterogeneous network is characterized in that said method comprises:

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

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

Confirm the Reference Signal Received Power RSRP of base station, low power nodes respectively and receive signal strength signal intensity indication RSSI; Further confirm base station, the RSRP of low power nodes and the ratio of RSSI respectively, with the needed Physical Resource Block PRB sum of said ratio and transmission N _PRBIntegration not as the RSRQ of base station, low power nodes.

3. method according to claim 2 is characterized in that, confirms 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 on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _RS, and obtain the path loss PL that said UE reports respectively, with P _RSWith the integration of PL not as the RSRP of base station, low power nodes;

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

The average transmit power P of PRB on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _PRB, with P _PRB, N _PRB, PL makes Lian Jihou, with the OFDM symbolic number N among the PRB _SymbolDiscuss, with quotient respectively as the RSSI of base station, low power nodes.

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

To P _RS, P _PRBCarry out weighting normalization and handle, 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 time slot sum in the setting-up time frame, δ (i),

Be respectively P in each time slot _RSAnd P _PRBWeights; δ (i),

Set according to load balancing, presence of intercell interference, coverage adjustment;

The said RSRQ that confirms base station, low power nodes respectively, for:

With the P after the weighting normalization processing _RS, P _PRBConfirm the RSRQ of base station, low power nodes.

5. method according to claim 1 is characterized in that, said setting threshold comprises switching threshold, resource and power division threshold value;

Said interference management comprises cell selecting and switching, resource and power division or control channel information carrying;

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

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

6. method according to claim 5 is characterized in that, said interference management strategy comprises:

Greater than switching threshold, carry out the sub-district and switch;

Smaller or equal to switching threshold during greater than first resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information is all sending on the RE, and when carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of main composition carrier wave;

Smaller or equal to first resource and power division threshold value during greater than second resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information sends on the RE of all full power emissions; When carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of master's composition carrier wave of all full power emissions;

Smaller or equal to second resource and power division threshold value during greater than information resources and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information of base station sends on the RE of full power emission, and the controlling links channel information of low power nodes sends on the RE of non-full power emission; When carrier wave was not supported backward compatibility, the controlling links channel information of base station sent on the RE of non-full power emission, and the controlling links channel information of low power nodes sends on the RE of full power emission.

7. method according to claim 1 is characterized in that, said interference management strategy comprises:

Launch with full power when the carrier resource of base station or low power nodes is quadrature and/or accurate quadrature, when nonopiate and/or quadrature and/or accurate quadrature to reduce power emission.

8. interference management device in the heterogeneous network is characterized in that said device comprises definite unit, comparing unit and interference management unit, wherein:

Confirm the unit, confirm the RSRQ of base station, low power nodes respectively;

Comparing unit is used for the RSRQ of base station and the RSRQ ratio and the setting threshold of low power nodes are compared;

The interference management unit is used for according to comparative result UE being carried out interference management.

9. device according to claim 8; It is characterized in that said definite unit also is used for, confirm the RSRP and the RSSI of base station, low power nodes respectively; Further confirm base station, the RSRP of low power nodes and the ratio of RSSI respectively, with the needed PRB sum of said ratio and transmission N _PRBIntegration not as the RSRQ of base station, low power nodes.

10. device according to claim 9 is characterized in that, said definite unit also is used for, the linear average P of all RE received powers of the cell reference signals on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _RS, and obtain the path loss PL that said UE reports respectively, with P _RSWith the integration of PL not as the RSRP of base station, low power nodes;

The average transmit power P of PRB on interior two time slots of reception bandwidth of definite respectively base station, low power nodes _PRB, with P _PRB, N _PRB, PL makes Lian Jihou, with the OFDM symbolic number N among the PRB _SymbolDiscuss, with quotient respectively as the RSSI of base station, low power nodes.

11. device according to claim 10 is characterized in that, said device also comprises:

Weighting normalization processing unit is used for P _RS, P _PRBCarry out weighting normalization and handle, 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 time slot sum in the setting-up time frame, δ (i),

Be respectively P in each time slot _RSAnd P _PRBWeights; δ (i),

Set according to load balancing, presence of intercell interference, coverage adjustment;

Said definite unit also is used for, the P after handling with weighting normalization _RS, P _PRBConfirm the RSRQ of base station, low power nodes.

12. device according to claim 8 is characterized in that, said setting threshold comprises switching threshold, resource and power division threshold value;

Said interference management comprises cell selecting and switching, resource and power division or control channel information carrying;

Said interference management unit also is used for, and according to RSRQ and the RSRQ ratio of low power nodes and the comparing result and the predefined interference management strategy of setting threshold of base station, confirms corresponding interference management mode.

13. device according to claim 12 is characterized in that, said interference management strategy comprises:

Greater than switching threshold, carry out the sub-district and switch;

Smaller or equal to switching threshold during greater than first resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information is all sending on the RE, and when carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of main composition carrier wave;

Smaller or equal to first resource and power division threshold value during greater than second resource and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information sends on the RE of all full power emissions; When carrier wave was not supported backward compatibility, the controlling links channel information sent on whole RE of master's composition carrier wave of all full power emissions;

Smaller or equal to second resource and power division threshold value during greater than information resources and power division threshold value; When carrier wave is supported backward compatibility; The controlling links channel information of base station sends on the RE of full power emission, and the controlling links channel information of low power nodes sends on the RE of non-full power emission; When carrier wave was not supported backward compatibility, the controlling links channel information of base station sent on the RE of non-full power emission, and the controlling links channel information of low power nodes sends on the RE of full power emission;

And/or, launch with full power when the carrier resource of base station or low power nodes is quadrature and/or accurate quadrature, when nonopiate and/or quadrature and/or accurate quadrature to reduce power emission.

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