CN102238582A

CN102238582A - Method for determining neighboring cell interference, system and apparatus thereof

Info

Publication number: CN102238582A
Application number: CN2010101598207A
Authority: CN
Inventors: 高秋彬; 缪德山; 孙韶辉
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2010-04-23
Filing date: 2010-04-23
Publication date: 2011-11-09
Anticipated expiration: 2030-04-23
Also published as: CN102238582B

Abstract

An embodiment of the invention relates to the wireless communication technology, especially relates to a method for determining neighboring cell interference, a system and an apparatus thereof. In the prior art, if a cell employs a resource element (RE) MUTING scheme, neighboring cell interference precision determined by a user terminal is low. The invention can solve the above problem. The method in the embodiment of the invention comprises the following steps that: s base station in a first cell determines a first interference power parameter value, wherein the first interference power parameter value is used for determining the interference generated by the user terminal in a second cell to the user terminal in the first cell; the base station in the first cell sends the first interference power parameter value to the user terminal so as to instruct the user terminal to determine a neighboring cell interference value according to the first interference power parameter value. By using the embodiment of the invention, the user terminal determines the neighboring cell interference according to the first interference power parameter value so that the precision of interference estimate can be raised.

Description

The mthods, systems and devices that disturb a kind of definite adjacent area

Technical field

The present invention relates to wireless communication technology, the mthods, systems and devices that disturb particularly a kind of definite adjacent area.

Background technology

Each sub-district has a base station and user terminal communication usually in the wireless cellular network system.Before data transmission procedure began, the base station can send reference signal (pilot signal) to user terminal, and user terminal then obtains channel estimation value according to these reference signals.Reference signal is to appoint at special time the known signal sequence that sends on the characteristic frequency.Factors such as interference and noise all can influence the quality of channel estimating.

Usually user terminal is to be positioned at different geographical position, has different received signal intensity and noise and interference intensity.Therefore, some user terminals can be with higher rate communication, as is positioned at the terminal of center of housing estate, and the other user terminal then can only be with than low rate communication, as the terminal of cell edge.In order to make full use of the transmission bandwidth of user terminal, the data format that sends to user terminal preferably can be complementary with the channel condition of this user terminal.Make and to send to the data format of user terminal and technology that its channel condition is complementary is called link circuit self-adapting.

In order to help the base station to realize link circuit self-adapting, user terminal need be according to its channel condition reporting channel quality indication (CQI) information (CQI).The CQI correspondence of user terminal to send up certain running time-frequency resource, that is to say, the CQI of user terminal to send up is the transmittability on these running time-frequency resources of expression.The calculating of CQI needs user terminal to record the interference of the adjacent sub-district that self is subjected to, and comprises and disturbs I and noise power N0.

As shown in Figure 1, pilot tone and the data map relation in the PRB (Physical Resource Block, Physical Resource Block).Preceding two OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol is used for the transmission of control information, is the data area from the 3rd OFDM sign-on.Comprise pilot tone RE (Resource Element, resource element) and data RE in the data area.The pilot tone of different districts can be mapped on the different RE.This is because usually the power of pilot tone RE can be higher, and it is very strong to be mapped between the pilot tone on the identical RE interference meeting, influences channel estimated accuracy.Still can be subjected to the interference of neighbor cell data when even so, user terminal utilizes pilot tone RE to carry out channel estimating.The interference that the terminal of cell edge is subjected to is especially strong.For addressing this problem, those RE that neighbor cell can be sent out pilot tone in the sub-district are available, and promptly send data 0, and this scheme is called RE MUTING, specifically referring to Fig. 1.

User terminal feedback CQI need estimate the interference of the adjacent sub-district that self is subjected to, and the interference of adjacent sub-district has not had in the position of pilot tone in the scheme of RE MUTING.Because the interference of neighbor cell is normally the strongest, will be in the interference that pilot frequency locations is calculated far below the actual interference that is subjected to.

In sum, if RE MUTING scheme is adopted in the sub-district at present, the adjacent area that user terminal is determined disturbs ratio of precision lower.

Summary of the invention

The mthods, systems and devices that the embodiment of the invention provides a kind of definite adjacent area to disturb, if adopt RE MUTING scheme in order to solve the sub-district that exists in the prior art, the lower problem of ratio of precision is disturbed in the adjacent area that user terminal is determined.

The method that the embodiment of the invention provides a kind of definite adjacent area to disturb, this method comprises:

The first interference power parameter value is determined in the base station of first sub-district, and the wherein said first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district;

The base station of described first sub-district sends to described user terminal with the described first interference power parameter value, is used to indicate described user terminal according to the described first interference power parameter value, determines the adjacent area interference value.

The method that the embodiment of the invention also provides a kind of definite adjacent area to disturb, this method comprises:

User terminal receives the first interference power parameter value from the base station of first sub-district, and the wherein said first interference power parameter value is used for determining the interference of second sub-district to user terminal generation in this first sub-district;

Described user terminal is determined the adjacent area interference value according to the described first interference power parameter value.

The system that the embodiment of the invention provides a kind of definite adjacent area to disturb, this system comprises:

The base station of first sub-district is used for determining and sending the first interference power parameter value;

User terminal is used for determining the adjacent area interference value according to the described first interference power parameter value;

Wherein, the described first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district.

The embodiment of the invention provides a kind of base station, and this base station comprises:

The parameter value determination module is used for determining the first interference power parameter value, and the wherein said first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district;

The parameter value sending module is used for the described first interference power parameter value is sent to described user terminal, is used to indicate described user terminal according to the described first interference power parameter value, determines the adjacent area interference value.

The embodiment of the invention provides a kind of user terminal, and this user terminal comprises:

The parameter value receiver module is used to receive the first interference power parameter value from the base station of first sub-district, and the wherein said first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district;

The interference value determination module is used for determining the adjacent area interference value according to the described first interference power parameter value.

The another kind that the embodiment of the invention provides is determined the method that disturb the adjacent area, and this method comprises:

The transmit power parameter value is determined in the base station of second sub-district;

The base station of described second sub-district is determined according to described transmit power parameter value and is sent the second interference power parameter value, be used to indicate the base station of receiving the described second interference power parameter value, determine the first interference power parameter value according to the described second interference power parameter value, and this first interference power parameter value sent to user terminal, determine the adjacent area interference value for described user terminal;

The wherein said first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in the adjacent area.

The base station of the embodiment of the invention first sub-district sends to user terminal with the first interference power parameter value, be used for indicating user terminal according to the first interference power parameter value, determine the adjacent area interference value, wherein the first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district.Because user terminal is determined the adjacent area interference according to the first interference power parameter value, thereby improved the precision of Interference Estimation;

Further, determine CQI, can also improve the precision of CQI, and then make the base station can better realize link circuit self-adapting, improve the efficient of transfer of data if disturb the adjacent area that user terminal utilizes the embodiment of the invention to determine.

Description of drawings

Fig. 1 is a RE MUTING schematic diagram in the background technology;

Fig. 2 determines the system configuration schematic diagram that disturb the adjacent area for the embodiment of the invention;

Fig. 3 is the structural representation of embodiment of the invention base station;

Fig. 4 is the structural representation of embodiment of the invention user terminal;

Fig. 5 is the method flow schematic diagram that disturb first kind of definite adjacent area of the embodiment of the invention;

Fig. 6 is the method flow schematic diagram that disturb second kind of definite adjacent area of the embodiment of the invention;

The third determines the method flow schematic diagram that disturb the adjacent area to Fig. 7 for the embodiment of the invention.

Embodiment

The base station of the embodiment of the invention first sub-district sends to user terminal with the first interference power parameter value, be used for indicating user terminal according to the first interference power parameter value, determine the adjacent area interference value, wherein the first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district.Because user terminal is determined the adjacent area interference according to the first interference power parameter value, thereby improved the precision of Interference Estimation.

Below in conjunction with Figure of description the embodiment of the invention is described in further detail.

As shown in Figure 2, the embodiment of the invention determines that the system that disturb the adjacent area comprises: the base station 10 of first sub-district and user terminal 20.

The base station 10 of first sub-district is used for determining and sending the first interference power parameter value, and wherein the first interference power parameter value is used for determining the interference of second sub-district (being sub-district B) to the generation of the user terminal in this first sub-district (being sub-district A).

In specific implementation process, first sub-district and second sub-district are adjacent or non-conterminous two sub-districts.

User terminal 20 is used to receive the first interference power parameter value, and according to the first interference power parameter value, determines the adjacent area interference value.

Wherein, the embodiment of the invention determines that the system that disturb the adjacent area can further include: the base station 30 of second sub-district.

The base station 30 of second sub-district is used for determining the transmit power parameter value, determines the second interference power parameter value according to the transmit power parameter value, and the second interference power parameter value is sent to the base station 10 of first sub-district.

The base station 10 of first sub-district is different base stations with the base station 30 of second sub-district, also can be same base station.

If base station 10 and base station 30 are different base stations, then transmit by the interface between the base station (such as X2 interface); If base station 10 and base station 30 are same base stations, then the interface by inside of base station transmits.

Wherein, the base station 30 of second sub-district can also be notified to a plurality of sub-districts with the second interference power parameter value, and wherein each sub-district all is the neighbor cell of sub-district B, wherein comprises sub-district A certainly.

Concrete, if the base station 30 of second sub-district is notified to sub-district A with the second interference power parameter value, if then second sub-district does not send signal (being that sub-district B has been REMUTTING) on the pilot tone RE of first sub-district, the average transmit power of the pilot tone RE in the bandwidth will be measured divided by the average transmit power of measuring the data RE in the bandwidth in the base station 30 of second sub-district, and the value that obtains is as the transmit power parameter value; If second sub-district sends signal (being that sub-district B is not REMUTTING) on the pilot tone RE of first sub-district, the base station 30 of second sub-district determines that the transmit power parameter value is infinitely great.

If the base station 30 of second sub-district is notified to a plurality of sub-districts with the second interference power parameter value, the average transmit power of the pilot tone RE in the bandwidth will be measured divided by the average transmit power of measuring the data RE in the bandwidth in the base station 30 of second sub-district, and the value that obtains is as the transmit power parameter value.

For guaranteeing the orthogonality of pilot tone between antenna, every antenna all can not send any signal on some specific pilot tone RE.There is dual mode the base station 30 of second sub-district when calculating the average transmit power of this root antenna:

The pilot tone RE that the base station 30 of mode one, second sub-district will not send any signal counts;

The pilot tone RE that the base station 30 of mode two, second sub-district will not send any signal counts, but makes the average transmit power of these pilot tones RE equal 0.

When measuring the average transmit power of the data RE in the bandwidth, the base station 30 of second sub-district can calculate in a period of time, measure the average transmit power of the pilot tone RE in the bandwidth W1 and the average transmit power of data RE with the average transmit power of measuring the pilot tone RE in the bandwidth.

If do not dispatch any terminal in a Resource Block, the base station 30 of second sub-district is designated as 0 with the transmitting power of the data RE in this Resource Block.

If there are many transmit antennas the base station 30 of second sub-district, then average transmit power can be the average power of a transmit antennas wherein; Also can be the average power sum or the average of all transmitting antennas, average power sum such as all transmitting antennas is exactly that the average power of determining every transmit antennas is earlier sued for peace then, and the average of all transmitting antennas is exactly that the average power of all transmitting antennas is sued for peace then divided by antenna amount.

The transmit power parameter value that the average transmit power of measuring the pilot tone RE in the bandwidth is obtained divided by the average transmit power of measuring the data RE in the bandwidth can be the statistical value in the past period, also can be the predicted value to a period of time in future.

When the base station 30 of second sub-district determines that the transmit power parameter value is infinitely great (∞), can make directly that the transmit power parameter value is infinitely great, also can make the average transmit power of measuring the data RE in the bandwidth is 0, the average transmit power that to measure the pilot tone RE in the bandwidth then is divided by the average transmit power of measuring the data RE in the bandwidth, and the value that obtains must be infinitely great.

When the second interference power parameter value is determined according to the transmit power parameter value in the base station 30 of second sub-district, actual is exactly that the transmit power parameter value that will determine quantizes, and with the numerical value that quantizes to obtain as the second interference power parameter value, do the bit number that to save the base station 10 that sends to first sub-district like this, thereby save resource.

The mode that the transmit power parameter value is quantized has a lot.Such as: from numerical value set, select one to be worth immediate numerical value with definite transmit power parameter, and with this numerical value as the second interference power parameter value;

Such as the transmit power parameter value of determining being carried out the log-domain conversion, from the numerical value set, select one with carry out the immediate numerical value of value that log-domain is converted to, and with this numerical value as the second interference power parameter value.The assumed transmit power parameter value is ρ _B, quantize again being transformed into log-domain earlier.Promptly

Check then { 4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6,7,8,9,10, ∞ } set in ρ _B ^DBImmediate numerical value, and with this numerical value as the second interference power parameter value.

If in the numerical value set a plurality of immediate numerical value are arranged, be 3.5 such as the transmit power parameter value, have 3 and 4 in the numerical value set, then can select one at random, also can select big or little numerical value as required.

Need to prove that the embodiment of the invention is carried out quantification manner to the transmit power parameter value and is not limited to above-mentioned two kinds, other modes that the transmit power parameter value can be quantized all are suitable for the embodiment of the invention.

Accordingly, the first interference power parameter value according to the second interference power parameter value of receiving, is determined in the base station 10 of first sub-district after the signal of determining neighbor cell is interference signal;

After the signal of determining neighbor cell is not interference signal, determine that the first interference power parameter value is infinitely great.

It is a variety of that the base station 10 of first sub-district judges that whether the signal of neighbor cell is that the mode of interference signal has, and such as for specific transmission plan, the signal of neighbor cell just is not to disturb, but useful signal.Multi-point cooperative transmission scheme for example, the base station of a plurality of sub-districts is simultaneously to a user terminal to transmit data, and at this moment, the signal that sends to the sub-district of user terminal to transmit data is exactly a useful signal, rather than interference signal.

If after determining that the signal of neighbor cell is interference signal, the base station 10 of first sub-district is according to the second interference power parameter value, and the mode of determining the first interference power parameter value includes but not limited to a kind of in the following manner:

With the second interference power parameter value received as the first interference power parameter value;

To carry out the second interference power parameter value that log-domain transforms, carry out the conversion of linear territory (promptly

The numerical value that obtains is as the first interference power parameter value.

The base station 10 of first sub-district can send by a kind of mode in system broadcasts, high-level signaling, the physical layer signaling when sending the first interference power parameter value to user terminal.

Concrete, the base station 10 of first sub-district can send to user terminal 20 with the first interference power parameter value after determining to satisfy the transmission condition.

Satisfy the transmission condition and include but not limited in the following condition one or more:

The transmitting time of setting arrives, and sends such as the cycle;

The absolute value of the difference between current second interference power parameter value of receiving and the last second interference power parameter value of receiving is greater than threshold value;

When the user terminal of new access is arranged, first power parameter value is sent to this user terminal;

Receive the request of obtaining that user terminal sends.

In specific implementation process, the base station 10 of first sub-district can also send to user terminal 20 with the first interference power parameter value together with the cell ID of neighbor cell (being sub-district B), make user terminal 20 know corresponding which sub-district of this first interference power parameter value, thereby when needs are adjusted interference value, can determine it is which sub-district.

Wherein, user terminal 20 according to neighbor cell mean receiving power value and the first interference power parameter value of receiving, determines to disturb adjusted value after receiving the first interference power parameter value, according to disturbing adjusted value that the initial interference value is adjusted, with adjusted numerical value as the adjacent area interference value.

Concrete, if user terminal 20 is infinitely great at the first interference power parameter value of receiving, then can directly makes and disturb adjusted value to equal 0;

If user terminal 20 is not infinitely great at the first interference power parameter value of receiving, then can determine to disturb adjusted value according to the neighbor cell mean receiving power value and the first interference power parameter value determined.

Further, user terminal 20 is adjusted the initial interference value after having determined the interference adjusted value, with adjusted numerical value as the adjacent area interference value.

If the first interference power parameter value that user terminal 20 is received then needs to be converted to linear value earlier (promptly through the log-domain conversion

).

Wherein, user terminal 20 can be determined the initial interference value according to following manner:

User terminal 20 is determined the initial interference value according to other area interference and the noise power that are subjected on the pilot tone RE that measures in first sub-district that estimates in the bandwidth W2.

If the neighbor cell B of user terminal sends at sub-district A on the RE of pilot tone and do not send any data and pilot tone (being that sub-district B has been RE MUTTING), then the interference that records of user terminal does not comprise the interference of sub-district B.

Wherein, user terminal 20 can be determined neighbor cell mean receiving power value according to following manner:

User terminal 20 is measured the mean receiving power (such as being mean value in the certain hour) of the pilot tone REs of neighbor cells (being sub-district B) in measuring bandwidth W3, is designated as I ₁This received power can be calculated with the pilot tone RE of 1 transmit antennas, also can calculate with the pilot tone RE of many transmit antennas.This received power calculates according to the base station 30 of second sub-district under the B of the sub-district channel information to user terminal 20, that is to say that user terminal 20 will estimate channel information, calculates average power again.

In specific implementation process, if mode one is adopted in the base station 30 of second sub-district when calculating the average transmit power of antenna, then user terminal 20 can adopt formula one to calculate the mean receiving power value of second sub-district.

I_{1} = \frac{1}{N} Σ_{k = 1}^{N} Σ_{p = 1}^{P} {| h_{k}^{p} |}^{2}

... ... ... ... .. formula one.

H wherein _k ^pBe sub-district B at setting-up time and measure the Channel Transmission coefficient that p root antenna on k the pilot tone RE in the bandwidth W2 scope arrives terminal; N is the sum of pilot tone RE, and P is the antenna sum.

Perhaps, the channel estimation value that makes the pilot tone RE that does not send any signal of antenna p is 0, and then the base station 30 of second sub-district can adopt formula two to calculate the second sub-district mean receiving power value.

I_{1} = \frac{P}{N} Σ_{k = 1}^{N} Σ_{p = 1}^{P} {| h_{k}^{p} |}^{2}

... ... ... ... .. formula two.

The implication that physical parameter is concrete in the formula two is identical with formula one, does not repeat them here.

Accordingly, user terminal 20 can be determined the adjacent area interference value according to formula three.

X=I ₀+ N ₀+ I ₁/ ρ _B... ... ... formula three.

Wherein, X is the adjacent area interference value, I ₀+ N ₀Be the initial interference value, I ₁Be second sub-district (sub-district B) mean receiving power value, ρ _BIt is the first interference power parameter value.

If ρ as can be seen from formula three _BDuring=∞, then be equivalent to be not counted in the interference of neighbor cell (being sub-district B).

In specific implementation process, if mode two is adopted in the base station 30 of second sub-district when calculating the average transmit power of antenna, then user terminal 20 can adopt formula one to calculate the second sub-district mean receiving power value;

Accordingly, user terminal 20 can be determined the adjacent area interference value according to formula four.

X=I ₀+ N ₀+ I ₁/ (P ρ _B) ... ... ... formula four.

In the formula four, P is the antenna sum, and the implication that other physical parameters are concrete is identical with formula three, does not repeat them here.

Perhaps user terminal 20 is changed to 0 with the channel estimation value on the pilot tone RE that does not send any signal of respective antenna when calculating with formula one;

In specific implementation process, measurement bandwidth W1 above-mentioned, measurement bandwidth W2 and measurement bandwidth W3 can be that whole bandwidth also can be a subband.

If measuring bandwidth W1, measuring bandwidth W2 and measure bandwidth W3 is whole bandwidth, what user terminal 20 carried out when determining the initial interference value is bandwidth measurement, and 30 needs in the base station of second sub-district are determined one second interference power parameter value at every turn;

If measuring bandwidth W1, measuring bandwidth W2 and measure bandwidth W3 is a subband, what user terminal 20 carried out when determining the initial interference value is that subband is measured, the base station 30 of second sub-district needs each a plurality of second interference power parameter values of determining, corresponding subband of each second interference power parameter value wherein, and a plurality of second interference power parameter values are sent to the base station 10 of first sub-district, user terminal 20 is when determining area interference, and the interference of each subband need be adjusted with the first interference power parameter value of respective sub-bands.

In specific implementation process, be a subband if measure bandwidth W1, measure bandwidth W2 and measure bandwidth W3, the base station 10 of first sub-district can be in notice according to the subband order one by one correspondence notify the first interference power parameter value; Accordingly, user terminal 20 just can be determined corresponding subband according to the order of the first interference power parameter value of receiving.

The base station 10 of first sub-district can also be according to the corresponding relation of subband and subband sign, and the subband sign of the first interference power parameter value and corresponding subband is sent to user terminal 20 together; Accordingly, user terminal 20 just can be determined to identify the corresponding subband of receiving together of the first interference power parameter value with this subband according to the corresponding relation of subband and subband sign and the subband sign of receiving.

Need to prove that the embodiment of the invention determines that the mode of the subband of the first interference power parameter value correspondence is not limited to above-mentioned two kinds, other modes that can determine the subband of the first interference power parameter value correspondence are suitable for the embodiment of the invention equally.

Wherein, if the second interference power parameter value has all been transmitted to the base station of first sub-district in the base station of a plurality of neighbor cells of first sub-district, the first corresponding interference power parameter value (promptly determining a plurality of first interference power parameter values) need be determined according to each second interference power parameter value in the base station of first sub-district, the corresponding neighbor cell of each second an interference power parameter value subband of neighbor cell (perhaps corresponding to).The base station 10 of first sub-district is notified to user terminal 20 with these first interference power parameter values.User terminal 20 needs each neighbor cell is calculated mean receiving power, can adopt top mode that each neighbor cell is calculated mean receiving power, also can adopt formula five or formula six to calculate interference value:

X=I ₀+ N ₀+ I ₁/ ρ _B1+ I ₂/ ρ _B2+ ...+I _M/ ρ _BM... ... ... formula five.

X=I ₀+ N ₀+ I ₁/ (P ₁ρ _B1)+I ₂/ (P ₂ρ _B2)+...+I _M/ (P _Mρ _BM) ... ... formula six.

I wherein _mBe the mean receiving power of m neighbor cell, P _mBe the number of antennas of m neighbor cell, ρ _BmBe the first interference power parameter value corresponding to m sub-district, the implication that other physical parameters are concrete is identical with formula three, does not repeat them here.

The base station 10 of first sub-district can be notified a plurality of first interference power parameter values when notifying the first interference power parameter value to user terminal 20 simultaneously, perhaps notifies respectively.The cell ID of each sub-district can be notified together with the first interference power parameter value or notify respectively, and perhaps user terminal can be according to the implicit corresponding relation that obtains between first interference power parameter value and the cell ID of the rule of prior agreement.

In specific implementation process, user terminal 20 can calculate CQI according to the adjacent area interference value of determining, and CQI be reported the base station 10 of first sub-district behind the interference value of definite adjacent area.

Further, user terminal 20 can estimate the channel information of the base station 10 of first sub-district to user terminal 20 according to the pilot tone of first sub-district (being sub-district A) when definite initial interference value, is used for when CQI calculates selection pre-coding matrix etc.

Because user terminal 20 calculates CQI according to the adjacent area interference value of determining, the precision of the CQI that obtains is significantly increased, and then makes the base station 10 of first sub-district can better realize link circuit self-adapting, improves the efficient of transfer of data.

As shown in Figure 3, the base station of the embodiment of the invention comprises: parameter value determination module 100 and parameter value sending module 110.

Parameter value determination module 100 is used for determining the first interference power parameter value, and wherein the first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district.

Parameter value sending module 110 is used for the first interference power parameter value that parameter value determination module 100 is determined is sent to user terminal, is used for indicating user terminal according to the first interference power parameter value, determines the adjacent area interference value.

Wherein, parameter value determination module 100 according to the second interference power parameter value of receiving from the base station under second sub-district, is determined the first interference power parameter value after the signal of determining second sub-district is interference signal; After the signal of determining neighbor cell is not interference signal, determine that the first interference power parameter value is infinitely great.

Further, parameter value sending module 110 sends to user terminal with the first interference power parameter value after determining to satisfy the transmission condition.

Wherein, the base station of the embodiment of the invention can further include: power determination module 120.

Power determination module 120 is used for determining the transmit power parameter value, determines the second interference power parameter value according to the transmit power parameter value, and sends the second interference power parameter value to the adjacent area of the sub-district of self-management.

Wherein, power determination module 120 will be measured the average transmit power of the pilot tone RE in the bandwidth divided by the average transmit power of measuring the data RE in the bandwidth, and the value that obtains is as the transmit power parameter value; Perhaps

If neighbor cell sends signal on the pilot tone RE of first sub-district, power determination module 120 determines that the transmit power parameter value is infinitely great.

Preferable, power determination module 120 quantizes the transmit power parameter value of determining, and with the numerical value that quantizes to obtain as the second interference power parameter value.

Concrete, power determination module 120 selects one to be worth immediate numerical value with definite transmit power parameter from the numerical value set, and with this numerical value as the second interference power parameter value; Or

The transmit power parameter value of determining is carried out the log-domain conversion, from the numerical value set, select one with carry out the immediate numerical value of value that log-domain is converted to, and with this numerical value as the second interference power parameter value.

In specific implementation process, power determination module 120 can with parameter value determination module 100 and parameter value sending module 110 in an entity, also can with parameter value determination module 100 and parameter value sending module 110 in different entities.

As shown in Figure 4, the user terminal of the embodiment of the invention comprises: parameter value receiver module 200 and interference value determination module 210.

Parameter value receiver module 200 is used to receive the first interference power parameter value from the base station of first sub-district, and wherein the first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district;

Interference value determination module 210 is used for the first interference power parameter value determined according to parameter value receiver module 200, determines the adjacent area interference value.

Concrete, interference value determination module 210 determines to disturb adjusted value according to the neighbor cell mean receiving power value and the first interference power parameter value received, according to disturbing adjusted value that the initial interference value is adjusted, with adjusted numerical value as the adjacent area interference value.

As shown in Figure 5, the method for first kind of definite adjacent area interference of the embodiment of the invention comprises the following steps:

The first interference power parameter value is determined in the base station of step 501, first sub-district, and wherein the first interference power parameter value is used for determining the interference of second sub-district (being sub-district B) to the generation of the user terminal in this first sub-district (being sub-district A).

The base station of step 502, first sub-district sends to user terminal with the first interference power parameter value, is used for indicating user terminal according to the first interference power parameter value, determines the adjacent area interference value.

Wherein, can further include after the step 502:

Step 503, user terminal receive the first interference power parameter value from the base station of first sub-district.

Step 504, user terminal are determined the adjacent area interference value according to the first interference power parameter value.

Wherein, can further include before the step 501:

The transmit power parameter value is determined in the base station of step a500, second sub-district, determines the second interference power parameter value according to the transmit power parameter value, and the second interference power parameter value is sent to the base station of first sub-district.

The base station of step b500, first sub-district receives the second interference power parameter value of the base station transmission of second sub-district.

The base station of the base station of first sub-district and second sub-district is different base station, also can be same base station.

If base station and base station are different base stations, then transmit by the interface between the base station (such as X2 interface); If base station and base station are same base stations, then the interface by inside of base station transmits.

Among the step a500, the base station of second sub-district can also be notified to the second interference power parameter value and a plurality of sub-districts, and wherein each sub-district all is the neighbor cell of sub-district B, wherein comprises sub-district A certainly.

Concrete, if the base station of second sub-district is notified to sub-district A with the second interference power parameter value, among the step a500, if second sub-district does not send signal (being that sub-district B has been RE MUTTING) on the pilot tone RE of first sub-district, the average transmit power of the pilot tone RE in the bandwidth will be measured divided by the average transmit power of measuring the data RE in the bandwidth in the base station of second sub-district, and the value that obtains is as the transmit power parameter value; If second sub-district sends signal (being that sub-district B is not REMUTTING) on the pilot tone RE of first sub-district, the base station of second sub-district determines that the transmit power parameter value is infinitely great.

If the base station of second sub-district is notified to a plurality of sub-districts with the second interference power parameter value, in the step 500, the average transmit power of the pilot tone RE in the bandwidth will be measured divided by the average transmit power of measuring the data RE in the bandwidth in the base station of second sub-district, and the value that obtains is as the transmit power parameter value.

For guaranteeing the orthogonality of pilot tone between antenna, every antenna all can not send any signal on some specific pilot tone RE.Among the step a500, there is dual mode the base station of second sub-district when calculating the average transmit power of this root antenna:

The pilot tone RE that the base station of mode one, second sub-district will not send any signal counts;

The pilot tone RE that the base station of mode two, second sub-district will not send any signal counts, but makes the average transmit power of these pilot tones RE equal 0.

When measuring the average transmit power of the data RE in the bandwidth, the base station of second sub-district can calculate in a period of time, measure the average transmit power of the pilot tone RE in the bandwidth W1 and the average transmit power of data RE with the average transmit power of measuring the pilot tone RE in the bandwidth.

If do not dispatch any terminal in a Resource Block, the base station of second sub-district is designated as 0 with the transmitting power of the data RE in this Resource Block.

If there are many transmit antennas the base station of second sub-district, then average transmit power can be the average power of a transmit antennas wherein; Also can be the average power sum or the average of all transmitting antennas, average power sum such as all transmitting antennas is exactly that the average power of determining every transmit antennas is earlier sued for peace then, and the average of all transmitting antennas is exactly that the average power of all transmitting antennas is sued for peace then divided by antenna amount.

When the base station of second sub-district determines that the transmit power parameter value is infinitely great (∞), can make directly that the transmit power parameter value is infinitely great, also can make the average transmit power of measuring the data RE in the bandwidth is 0, the average transmit power that to measure the pilot tone RE in the bandwidth then is divided by the average transmit power of measuring the data RE in the bandwidth, and the value that obtains must be infinitely great.

Among the step a500, when the second interference power parameter value is determined according to the transmit power parameter value in the base station of second sub-district, actual is exactly that the transmit power parameter value that will determine quantizes, and with the numerical value that quantizes to obtain as the second interference power parameter value, do the bit number that to save the base station that sends to first sub-district like this, thereby save resource.

Such as the transmit power parameter value of determining being carried out the log-domain conversion, from the numerical value set, select one with carry out the immediate numerical value of value that log-domain is converted to, and with this numerical value as the second interference power parameter value.

Accordingly, in the step 501, the first interference power parameter value according to the second interference power parameter value of receiving, is determined in the base station of first sub-district after the signal of determining neighbor cell is interference signal;

It is a variety of that the base station of first sub-district judges that whether the signal of neighbor cell is that the mode of interference signal has, and such as for specific transmission plan, the signal of neighbor cell just is not to disturb, but useful signal.

If after determining that the signal of neighbor cell is interference signal, the base station of first sub-district is according to the second interference power parameter value, and the mode of determining the first interference power parameter value includes but not limited to a kind of in the following manner:

In the step 502, the base station of first sub-district can send by a kind of mode in system broadcasts, high-level signaling, the physical layer signaling when sending the first interference power parameter value to user terminal.

Concrete, the base station of first sub-district can send to user terminal with the first interference power parameter value after determining to satisfy the transmission condition.

The transmitting time of setting arrives, and sends such as the cycle;

Receive the request of obtaining that user terminal sends.

In specific implementation process, the base station of first sub-district can also send to user terminal with the first interference power parameter value together with the cell ID of second sub-district (being sub-district B), make user terminal know corresponding which sub-district of this first interference power parameter value, thereby when needs are adjusted interference value, can determine it is which sub-district.

In the step 504, user terminal according to the second sub-district mean receiving power value and the first interference power parameter value of receiving, determines to disturb adjusted value after receiving the first interference power parameter value, according to disturbing adjusted value that the initial interference value is adjusted, with adjusted numerical value as the adjacent area interference value.

Concrete, if user terminal is infinitely great at the first interference power parameter value of receiving, then can directly makes and disturb adjusted value to equal 0;

If user terminal is not infinitely great at the first interference power parameter value of receiving, then can determine to disturb adjusted value according to the neighbor cell mean receiving power value and the first interference power parameter value determined.

Further, user terminal is adjusted the initial interference value after having determined the interference adjusted value, with adjusted numerical value as the adjacent area interference value.

If the first interference power parameter value that user terminal is received then needs to be converted to linear value earlier (promptly through the log-domain conversion

).

Wherein, user terminal can be determined the initial interference value according to following manner:

User terminal is determined the initial interference value according to other area interference and the noise power that are subjected on the pilot tone RE that measures in first sub-district that estimates in the bandwidth W2.

Wherein, user terminal can be determined neighbor cell mean receiving power value according to following manner:

The mean receiving power (such as being certain hour) of the pilot tone RE of user terminal measurement neighbor cell (being sub-district B) in measuring bandwidth W3 is designated as I ₁This received power can be calculated with the pilot tone RE of 1 transmit antennas, also can calculate with the pilot tone RE of many transmit antennas.This received power calculates according to the base station of second sub-district under the B of the sub-district channel information to user terminal, that is to say that user terminal 20 will estimate channel information, calculates average power again.

In specific implementation process, if among the step a500, mode one is adopted in the base station of second sub-district when calculating the average transmit power of antenna, and then user terminal can adopt formula one to calculate the second sub-district mean receiving power value; Perhaps, the channel estimation value that makes the pilot tone RE that does not send any signal of antenna p is 0, and then user terminal can adopt formula two to calculate the second sub-district mean receiving power value.

Accordingly, user terminal can be determined the adjacent area interference value according to formula two.

In specific implementation process, if among the step a500, mode two is adopted in the base station of second sub-district when calculating the average transmit power of antenna, and then user terminal can adopt formula one to calculate the second sub-district mean receiving power value; Accordingly, user terminal 20 can be determined the adjacent area interference value according to formula four.

Perhaps user terminal is changed to 0 with the channel estimation value on the pilot tone RE that does not send any signal of respective antenna when calculating with formula one;

Accordingly, user terminal can be determined the adjacent area interference value according to formula three.

If measuring bandwidth W1, measuring bandwidth W2 and measure bandwidth W3 is whole bandwidth, what carry out when user terminal is determined the initial interference value is bandwidth measurement, and the base station of second sub-district only needs to determine one second interference power parameter value at every turn;

If measuring bandwidth W1, measuring bandwidth W2 and measure bandwidth W3 is a subband, what carry out when user terminal is determined the initial interference value is that subband is measured, the base station of second sub-district needs each a plurality of second interference power parameter values of determining, corresponding subband of each second interference power parameter value wherein, and a plurality of second interference power parameter values are sent to the base station of first sub-district, user terminal is when determining area interference, and the interference of each subband need be adjusted with the first interference power parameter value of respective sub-bands.

In specific implementation process, be a subband if measure bandwidth W1, measure bandwidth W2 and measure bandwidth W3, in the step 502, the base station of first sub-district can be in notice according to the subband order one by one correspondence notify the first interference power parameter value; Accordingly, in the step 504, user terminal just can be determined corresponding subband according to the order of the first interference power parameter value of receiving.

In the step 502, the base station of first sub-district can also be according to the corresponding relation of subband and subband sign, and the subband sign of the first interference power parameter value and corresponding subband is sent to user terminal together; Accordingly, in the step 504, user terminal just can be determined to identify the corresponding subband of receiving together of the first interference power parameter value with this subband according to the corresponding relation of subband and subband sign and the subband sign of receiving.

Wherein, if the second interference power parameter value has all been transmitted to the base station of first sub-district in the base station of a plurality of neighbor cells of first sub-district, the first corresponding interference power parameter value (promptly determining a plurality of first interference power parameter values) need be determined according to each second interference power parameter value in the base station of first sub-district, the corresponding neighbor cell of each second an interference power parameter value subband of neighbor cell (perhaps corresponding to).The base station of first sub-district is notified to user terminal with these first interference power parameter values.User terminal needs each neighbor cell is calculated mean receiving power, can adopt top mode that each neighbor cell is calculated mean receiving power, also can adopt formula five or formula six to calculate interference value:

The base station of first sub-district can be notified a plurality of first interference power parameter values when notifying the first interference power parameter value to user terminal simultaneously, perhaps notifies respectively.The cell ID of each sub-district can be notified together with the first interference power parameter value or notify respectively, and perhaps user terminal can be according to the implicit corresponding relation that obtains between first interference power parameter value and the cell ID of the rule of prior agreement.

In the step 504, user terminal can calculate CQI according to the adjacent area interference value of determining, and CQI be reported the base station of first sub-district behind the interference value of definite adjacent area.

Further, user terminal can estimate the channel information of the base station of first sub-district to user terminal according to the pilot tone of first sub-district (being sub-district A) when definite initial interference value, is used for when CQI calculates selection pre-coding matrix etc.

Because user terminal calculates CQI according to the adjacent area interference value of determining, the precision of the CQI that obtains is significantly increased, and then makes the base station of first sub-district can better realize link circuit self-adapting, improves the efficient of transfer of data.

As shown in Figure 6, the method for second kind of definite adjacent area interference of the embodiment of the invention comprises the following steps:

Step 601, user terminal receive the first interference power parameter value from the base station of first sub-district, and wherein the first interference power parameter value is used for determining the interference to the generation of the user terminal in first sub-district of second sub-district.

Step 602, user terminal are determined the adjacent area interference value according to the first interference power parameter value.

Wherein, step 601 and step 602 are identical with step 503 and step 504 among Fig. 5 respectively, do not repeat them here.

As shown in Figure 7, the third method of determining that the adjacent area is disturbed of the embodiment of the invention comprises the following steps:

The transmit power parameter value is determined in the base station of step 701, second sub-district.

The base station of step 702, second sub-district is determined according to the transmit power parameter value and is sent the second interference power parameter value, be used to indicate the base station of receiving the second interference power parameter value, determine the first interference power parameter value according to the second interference power parameter value, and this first interference power parameter value sent to user terminal, determine the adjacent area interference value for user terminal.

Wherein, the first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in the adjacent area.

Wherein, step 701 is identical with step a501 with step 702, does not repeat them here.

Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.

The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.

These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.

From the foregoing description as can be seen: the first interference power parameter value is determined in the base station of the embodiment of the invention first sub-district, and wherein the first interference power parameter value is used for the interference of determining that second sub-district produces the user terminal in this first sub-district; The base station of first sub-district sends to user terminal with the first interference power parameter value, is used for indicating user terminal according to the first interference power parameter value, determines the adjacent area interference value.

Because user terminal is determined the adjacent area interference according to the first interference power parameter value, thereby improved the precision of Interference Estimation;

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. method that disturb definite adjacent area is characterized in that this method comprises:

2. the method for claim 1 is characterized in that, the base station of described first sub-district is determined also to comprise before the first interference power parameter value:

Receive the second interference power parameter value of the base station transmission of second sub-district.

3. method as claimed in claim 2 is characterized in that, the base station of described first sub-district is determined also to comprise before the first interference power parameter value:

The transmit power parameter value is determined in the base station of described second sub-district;

The second interference power parameter value is determined according to described transmit power parameter value in the base station of described second sub-district, and the described second interference power parameter value is sent to the base station of described first sub-district.

4. method as claimed in claim 3 is characterized in that, the base station of described second sub-district determines that the transmit power parameter value comprises:

The average transmit power of the pilot tone RE in the bandwidth will be measured divided by the average transmit power of measuring the data RE in the bandwidth in the base station of described second sub-district, and the value that obtains is as the transmit power parameter value; Perhaps

If described second sub-district sends signal on the pilot tone RE of first sub-district, the base station of described second sub-district determines that the transmit power parameter value is infinitely great.

5. method as claimed in claim 4 is characterized in that, described average transmit power is the average transmit power of an antenna, or the average transmit power sum of many antennas or transmitting power average.

6. method as claimed in claim 4 is characterized in that, the base station of described second sub-district determines that the second interference power parameter value comprises:

The described transmit power parameter value that the base station of described second sub-district will be determined quantizes, and with the numerical value that quantizes to obtain as the second interference power parameter value.

7. method as claimed in claim 6 is characterized in that, the base station of described second sub-district determines that the second interference power parameter value comprises:

The base station of described second sub-district selects one to be worth immediate numerical value with definite transmit power parameter from numerical value set, and with this numerical value as the second interference power parameter value; Or

The log-domain conversion is carried out with the transmit power parameter value of determining in the base station of described second sub-district, from the numerical value set, select one with carry out the immediate numerical value of value that log-domain is converted to, and with this numerical value as the second interference power parameter value.

8. method as claimed in claim 3 is characterized in that, the base station of described first sub-district determines that the first interference power parameter value comprises:

The described first interference power parameter value according to the described second interference power parameter value of receiving, is determined in the base station of described first sub-district after the signal of determining described second sub-district is interference signal;

The base station of described first sub-district determines that the described first interference power parameter value is infinitely great after the signal of determining described second sub-district is not interference signal.

9. as the arbitrary described method of claim 1～8, it is characterized in that the base station of described first sub-district also comprises after sending the described first interference power parameter value:

Described user terminal determines to disturb adjusted value according to the second sub-district mean receiving power value and the described first interference power parameter value of receiving;

Described user terminal is adjusted the initial interference value according to described interference adjusted value, with adjusted numerical value as the adjacent area interference value.

10. as the arbitrary described method of claim 1～8, it is characterized in that the base station of described first sub-district sends the described first interference power parameter value and comprises:

The base station of described first sub-district sends to described user terminal with the described first interference power parameter value after determining to satisfy the transmission condition.

11. the method that disturb definite adjacent area is characterized in that this method comprises:

User terminal receives the first interference power parameter value from the base station of first sub-district, and the wherein said first interference power parameter value is used for determining the interference of second sub-district to the generation of the user terminal in this first sub-district;

12. method as claimed in claim 11 is characterized in that, described user terminal determines that the adjacent area interference value comprises:

13. the system that disturb definite adjacent area is characterized in that this system comprises:

14. system as claimed in claim 13 is characterized in that, described system also comprises:

The base station of second sub-district is used for determining the transmit power parameter value, determines the second interference power parameter value according to described transmit power parameter value, and the described second interference power parameter value is sent to the base station of described first sub-district.

15. system as claimed in claim 14 is characterized in that, the base station of described second sub-district specifically is used for:

To measure the average transmit power of the average transmit power of the pilot tone RE in the bandwidth divided by the data RE in the measurement bandwidth, the value that obtains is as the transmit power parameter value; Perhaps

If described second sub-district sends signal on the pilot tone RE of first sub-district, determine that the transmit power parameter value is infinitely great.

16. system as claimed in claim 14 is characterized in that, the base station of described second sub-district specifically is used for:

The described transmit power parameter value of determining is quantized, and with the numerical value that quantizes to obtain as the second interference power parameter value.

17. system as claimed in claim 16 is characterized in that, the base station of described second sub-district specifically is used for:

From numerical value set, select one to be worth immediate numerical value with definite transmit power parameter, and with this numerical value as the second interference power parameter value; Or

18. system as claimed in claim 14 is characterized in that, the base station of described first sub-district specifically is used for:

After the signal of determining described second sub-district is interference signal, according to the described second interference power parameter value of receiving, determine the described first interference power parameter value, after the signal of determining described second sub-district is not interference signal, determine that the described first interference power parameter value is infinitely great.

19., it is characterized in that described user terminal specifically is used for as the arbitrary described system of claim 13～18:

According to the second sub-district mean receiving power value and the described first interference power parameter value received, determine to disturb adjusted value, according to described interference adjusted value the initial interference value is adjusted, with adjusted numerical value as the adjacent area interference value.

20., it is characterized in that the base station of described first sub-district specifically is used for as the arbitrary described system of claim 13～18:

After determining to satisfy the transmission condition, the described first interference power parameter value is sent to described user terminal.

21. a base station is characterized in that, this base station comprises:

22. base station as claimed in claim 21 is characterized in that, described parameter value determination module specifically is used for:

After the signal of determining described second sub-district is interference signal,, determine the described first interference power parameter value according to the second interference power parameter value of receiving from the base station under second sub-district;

After the signal of determining described second sub-district is not interference signal, determine that the described first interference power parameter value is infinitely great.

23., it is characterized in that described parameter value sending module specifically is used for as claim 21 or 22 described base stations:

24. base station as claimed in claim 21 is characterized in that, described base station also comprises:

The power determination module is used for determining the transmit power parameter value, determines the second interference power parameter value according to described transmit power parameter value, and sends the described second interference power parameter value.

25. base station as claimed in claim 24 is characterized in that, described power determination module specifically is used for:

If neighbor cell sends signal on the pilot tone RE of first sub-district, determine that the transmit power parameter value is infinitely great.

26. base station as claimed in claim 24 is characterized in that, described power determination module specifically is used for:

27. base station as claimed in claim 24 is characterized in that, described power determination module specifically is used for:

28. a user terminal is characterized in that, this user terminal comprises:

29. user terminal as claimed in claim 28 is characterized in that, described interference value determination module specifically is used for:

According to neighbor cell mean receiving power value and the described first interference power parameter value received, determine to disturb adjusted value, according to described interference adjusted value the initial interference value is adjusted, with adjusted numerical value as the adjacent area interference value.

30. the method that disturb definite adjacent area is characterized in that this method comprises:

31. method as claimed in claim 30 is characterized in that, the base station of described second sub-district determines that the transmit power parameter value comprises:

32. method as claimed in claim 31 is characterized in that, described average transmit power is the average transmit power of an antenna, or the average transmit power sum of many antennas or transmitting power average.

33. method as claimed in claim 31 is characterized in that, the base station of described second sub-district determines that the second interference power parameter value comprises:

34. method as claimed in claim 33 is characterized in that, the base station of described second sub-district determines that the second interference power parameter value comprises: