CN102036354A - Method and device for allocating power to downlink control channel, and base station - Google Patents

Abstract

The invention discloses a method and a device for allocating power to a downlink control channel, and a base station. By the invention, the power is dynamically allocated to the downlink control channel, the reasonableness of allocating the power to the downlink control channel is improved, the receiving performance of the downlink control channel of each user is improved, and same frequency interference among cells of the downlink control channel is reduced. The method comprises the following steps of: determining the received signal-to-noise ratio of the downlink control channel of the user according to downlink channel information of the user; determining the target signal-to-noise ratio of the downlink control channel of the user; and determining the transmitting power of the downlink control channel of the user according to the received signal-to-noise ratio and the target signal-to-noise ratio. Due to the technical scheme, the reasonableness of allocating the power to the downlink control channel of the user is improved, so that the receiving performance of the downlink control channel of each user is improved, and the same frequency interference among the cells of the downlink control channel is reduced.

Description

A kind of method, device and base station of distributing power for down control channel

Technical field

The present invention relates to the communications field, relate in particular to a kind of method, device and base station of distributing power for down control channel.

Background technology

At present, at LTE (Long Term Evolution, Long Term Evolution) in the system, disturb for reducing in the sub-district, the mode of mainly taking is to adopt OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) technical transmission data in down control channel, though having reduced in the sub-district, this kind mode disturbs, disturb but increased ICI (Inter-Cell Interference, presence of intercell interference), compare particularly remarkable with traditional 3G system.Be to reduce presence of intercell interference, the mode of mainly taking is that frequency multiplexing mode transmission data are adopted in the minizone, promptly uses different band networkings between neighbor cell, is 3,4 or 7 networking mode as adopting frequency reuse; This kind networking mode proposes challenge greatly for the LTE system that system bandwidth is 20MHz to the maximum, as: when the networking bandwidth is 20MHz,, then need the LTE system that the bandwidth of 60MHz can be provided if the employing frequency reuse is 3 networking mode; If the employing frequency reuse is 4 networking mode, then need the LTE system that the bandwidth of 80MHz can be provided; If the employing frequency reuse system is 7 networking mode, then need the LTE system that the bandwidth of 140MHz can be provided; But frequency resource is comparatively in short supply at present, provides the difficulty of above-mentioned bandwidth bigger.

For realizing that frequency reuse is 1 networking mode, studied multiple minizone IM (IM in the standardisation process of LTE, Interference Mitigation, interference mitigation) technology, and carried out standardization to carrying out the required load information of the semi-static ICIC of uplink and downlink (Inter-Cell Interference Coordination, Inter-Cell Interference Coordination).But standardized semi-static ICIC only is provided with at the uplink and downlink shared channel, and for down control channel, can't take above-mentioned semi-static ICIC.

At present, PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) resource is very limited, based on present understanding to identical networking in the LTE system, performance how to guarantee control channel will become bottleneck and the key that realizes identical networking in the LTE system: if carry out identical networking, the interference that PDCCH is subjected to neighbor cell is bigger, thereby has limited the receptivity of PDCCH; And the schedule information of uplink and downlink shared channel and resource allocation information all carry by down control channel (as PDCCH), receive the correctness of information if can't guarantee PDCCH, will be bigger to QoS (Qualityof Service, the service quality) influence of customer service.

In the LTE system, PDCCH is used to carry user's DCI (Downlink ControlInformation, Downlink Control Information), this DCI comprises: the uplink power control command word information of uplink scheduling authorization information, downlink resource assignment information, multi-user association coding etc.; For supporting different kinds of information, DCI information can be divided into multiple form (being DCI format), and DCI format is different, and its pairing information bit length is also inequality.In a subframe, user's DCI message bit stream is by after cyclic redundancy check (CRC), coding, sub-block interleaving, rate-matched, scrambling, modulation, layer mapping, the precoding, be mapped on actual physical REG (Resource Element Group, the resource particle group) resource.

At present, for improving the utilance of PDCCH resource, for PDCCH has defined 4 kinds of forms (being PDCCH format), as shown in table 1 in the LTE system, these the 4 kinds of pairing PDCCH polymerization of PDCCH form grades are respectively 1,2,4,8; PDCCH polymerization grade is high more, and the shared physics REG resource of the PDCCH of user's correspondence is many more, and it is many more promptly to carry a DCI information resource needed, that is to say that the efficiency of transmission of this PDCCH channel of DCI information of the identical size of transmission is low more; Accordingly, receive PDCCH from the user, the PDCCH received signal to noise ratio of its requirement is low more.Adopting the DCI information of which kind of PDCCH form transmission user not make clear and definite regulation in the LTE standard, mainly is the product that depends on each equipment vendor.

Table 1 is the four kinds of forms of PDCCH in the LTE system

The PDCCH form	The polymerization grade	The REG number	Can data carried by data bit number
				o	1	9	72
1	2	18	144
				2	4	36	288
3	8	72	576

At present for the receptivity of the PDCCH that improves user's correspondence, improve utilance simultaneously to the PDCCH resource, main mode is: the constant power distribution principle is adopted to the PDCCH of each user's correspondence in the base station, and the specified transmitting power that is about to the base station is all distributed to the interior physics REG resource of an OFDM symbol.The power division of this kind PDCCH channel only adopts the strategy of power-sharing, the foundation of choosing the PDCCH form for user DCI information is the bit length of user's channel condition and user's DCI information, except the handling process of LTE standard code, each user's PDCCH performance guarantees that only relying on limited several polymerization grades (being generally 4) carries out link circuit self-adapting, can not guarantee the receptivity of PDCCH, may also can have the more serious problem of co-channel interference.

Summary of the invention

The invention provides a kind of method, device and base station of distributing power for down control channel, be embodied as down control channel dynamic assignment power, distribute rational power to rise to down control channel, thereby improve the receptivity and the minizone co-channel interference that reduces down control channel of each user's down control channel.

A kind of method for down control channel distribution power comprises:

According to user's descending channel information, determine the received signal to noise ratio of described user's down control channel;

Determine the target signal to noise ratio of described user's down control channel;

According to described received signal to noise ratio and described target signal to noise ratio, determine the transmitting power of described user's down control channel.

A kind of device for down control channel distribution power comprises:

The received signal to noise ratio determining unit is used for the descending channel information according to the user, determines the received signal to noise ratio of described user's down control channel;

The target signal to noise ratio determining unit is used to determine the target signal to noise ratio of described user's down control channel;

The transmitting power determining unit is used for the described target signal to noise ratio that the described received signal to noise ratio determined according to described received signal to noise ratio determining unit and described target signal to noise ratio unit are determined, and determines the transmitting power of described user's down control channel.

A kind of base station comprises: the aforementioned device that distributes power for down control channel.

Adopt technical solution of the present invention,, determine the received signal to noise ratio of described user's down control channel according to the descending channel information of user's correspondence; Determine the target signal to noise ratio of described user's down control channel; According to the received signal to noise ratio and the target signal to noise ratio of described user's down control channel, determine the transmitting power of described user's down control channel.Adopt technical solution of the present invention, coming according to the received signal to noise ratio of user's down control channel and target signal to noise ratio is that this down control channel distributes transmitting power, thereby make the receiving ability that to guarantee this down control channel for the transmitting power of down control channel distribution, having improved is down control channel distribution rational power, thereby has improved the receptivity and the minizone co-channel interference that has reduced down control channel of each user's down control channel.

Description of drawings

Fig. 1 is the method flow diagram that distributes power in the embodiment of the invention for down control channel;

Fig. 2 is the structural representation that distributes the device of power in the embodiment of the invention for down control channel.

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

Embodiment

Above-mentioned technical problem at the prior art existence, the embodiment of the invention provides a kind of method, device and base station of distributing power for down control channel, to be embodied as down control channel dynamic assignment power, distribute rational power to rise to down control channel, thereby improve the receptivity and the minizone co-channel interference that reduces down control channel of each user's down control channel.This method comprises: according to user's descending channel information, determine the received signal to noise ratio of described user's down control channel; Determine the target signal to noise ratio of described user's down control channel; According to described received signal to noise ratio and described target signal to noise ratio, determine the transmitting power of described user's down control channel.Adopt technical solution of the present invention, be embodied as down control channel dynamic assignment power, distribute rational power to rise to down control channel, thereby improve the receptivity and the minizone co-channel interference that reduces down control channel of each user's down control channel.

Below in conjunction with Figure of description technical solution of the present invention is described in detail.

Referring to Fig. 1, for distribute the method flow diagram of power in the embodiment of the invention for down control channel, this method comprises:

Step 101, according to user (the follow-up UE that uses _iExpression) descending channel information is determined the received signal to noise ratio SINR of described user's down control channel _{Receive (i)}

Step 102, determine the target signal to noise ratio SINR of described user's down control channel _{Targ et (i)}

Step 103, according to the received signal to noise ratio SINR of described user's down control channel _{Receive (i)}With target signal to noise ratio SINR _{Targ et (i)}, determine the transmitting power of described user's down control channel.

In the step in 101, UE _iCorresponding descending channel information comprises: UE _iThe received signal to noise ratio SINR of corresponding PDSCH (PhysicalDownlink Share Channel, Physical Downlink Shared Channel) _{Receive_PDSCH (i)}This SINR _{Receive_PDSCH (i)}Can determine according to following mode: obtain UE _iBroadband CQI (Channel QualityInformation, channel quality information) information, and from the broadband CQI information of obtaining, obtain CQI grade I _CQI(this I _CQIValue is by UE _iReport and in base station side according to this UE _iThe transmission situation of historical data revise obtain); Determine and described I according to link simulation _CQICorresponding SINR _{Receive_PDSCH (i)}SINR in the embodiment of the invention _{Receive_PDSCH (i)}Also can be called the signal to noise ratio under the target BLER (Block Loss Error Ratio, Block Error Rate), this target BLER and UE _iThe target BLER of down control channel identical; Such as UE _iThe target BLER of down control channel be 1%, SINR then _{Receive_PDSCH (i)}For target BLER is a signal to noise ratio under 1%.

In the above-mentioned steps 101, can be according to UE _iThe SINR of PDSCH correspondence _{Receive_PDSCH (i)}Determine UE _iThe received signal to noise ratio SINR of down control channel _{Receive (i)}Specifically can be as follows: with described SINR _{Receive_PDSCH (i)}Be defined as the received signal to noise ratio SINR of down control channel _{Receive (i)}, i.e. SINR _{Receive (i)}=SINR _{Receive_PDSCH (i)}Perhaps, for considering coded system difference, code length difference, the antenna transmission mode difference between PDSCH and the down control channel, to the received signal to noise ratio SINR of described PDSCH _{Receive_PDSCH (i)}Revise or reconstruct, obtain the received signal to noise ratio SINR that received signal to noise ratio is defined as down control channel _{Receive (i)}, can be as shown in the formula shown in (1):

SINR _{Receive (i)}=g (SINR _{Receive_PDSCH (i)})=SINR _{Receive_PDSCH (i)}-δ _{Diff_channel (i)}Formula (1)

In the formula (1), SINR _{Receive (i)}Be UE _iThe received signal to noise ratio of down control channel, SINR _{Receive_PDSCH (i)}Be UE _iThe received signal to noise ratio of PDSCH correspondence, δ _{Diff_channel (i)}Be correction value, this correction value is used to compensate UE _iPDSCH and coded system difference, code length difference, the antenna transmission mode difference of down control channel, concrete can determine to obtain according to link simulation.

In the step 102 of above-mentioned flow process, determine UE _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}, can be in the following ways: choose DCI form and multiple polymerization grade (as choosing 1,2,4,8 polymerization grade); At every kind of polymerization grade, determine described DCI form and adopt the needed receiving terminal signal to noise ratio of this kind polymerization grade, obtain the receiving terminal signal to noise ratio as the mode that can adopt link simulation; According to this, obtain a plurality of one to one receiving terminal signal to noise ratios of a plurality of and described multiple polymerization grade; Determine described UE according to described a plurality of receiving terminal signal to noise ratios _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}

Determine UE according to described a plurality of receiving terminal signal to noise ratios _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}, can adopt following four kinds of modes to obtain:

Mode one, directly the receiving terminal signal to noise ratio of value minimum in a plurality of receiving terminal signal to noise ratios (is supposed the receiving terminal signal to noise ratio SINR of polymerization grade l correspondence _{Targ et_aggre_l}The value minimum) is defined as UE _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}

Mode two, with the receiving terminal signal to noise ratio SINR of value minimum _{Targ et_aggre_l}With presence of intercell interference undulating value δ _DepravationAnd value, be defined as the target signal to noise ratio SINR of described user's down control channel _{Targ et (i)}, can be as shown in the formula shown in (2):

SINR _{Targ et (i)}=SINR _{Targ et_aggre_l}+ δ _DepravationFormula (2)

In the formula (2), SINR _{Targ et (i)}Be UE _iThe target signal to noise ratio of down control channel, SINR _{Targ et_aggre_l}Be the receiving terminal signal to noise ratio of polymerization grade l correspondence, δ _DepravationBe the presence of intercell interference undulating value, this δ _DepravationBe used to compensate the fluctuation of introducing the presence of intercell interference that the down control channel power distribution strategies brings.

Mode three, from described a plurality of receiving terminal signal to noise ratios, select and UE _iSINR _{Receive (i)}The most approaching receiving terminal signal to noise ratio (is supposed the receiving terminal signal to noise ratio SINR of polymerization grade k correspondence _{Targ et_aggre_k}With UE _iSINR _{Receive (i)}The most approaching), and with the received signal to noise ratio SINR that chooses _{Targ et_aggre_k}Be defined as the target signal to noise ratio SINR of described user's down control channel _{Targ et (i)}, i.e. SINR _{Targ et (i)}=SINR _{Targ et_aggre_k}

Mode four, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching and (suppose the receiving terminal signal to noise ratio SINR that polymerization grade k is corresponding with described received signal to noise ratio _{Targ et_aggre_k}With UE _iSINR _{Receive (i)}The most approaching), and with the received signal to noise ratio SINR that chooses _{Targ et_aggre_k}With presence of intercell interference undulating value δ _DepravationAnd value, be defined as the target signal to noise ratio SINR of described user's down control channel _{Targ et (i)}, can be as shown in the formula shown in (3):

SINR _{Targ et (i)}=SINR _{Targ et_aggre_k}+ δ _DepravationFormula (3)

In the formula (3), SINR _{Targ et (i)}Be UE _iThe target signal to noise ratio of down control channel, SINR _{Targ et_aggre_k}Be the receiving terminal signal to noise ratio of polymerization grade k correspondence, δ _DepravationBe the presence of intercell interference undulating value, this δ _DepravationBe used to compensate the fluctuation of introducing the presence of intercell interference that the down control channel power distribution strategies brings.

In the step 103 of above-mentioned flow process, determine UE _iThe transmitting power of down control channel

Comprise:

At UE _iDown control channel in each physical resource particle group REG _mThis physical resource particle group REG is determined and distributed to (supposing to comprise in the down control channel M REG) according to the rated power of base station _mPower P _{Uniform_allocation (m)}According to UE _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}With received signal to noise ratio SINR _{Receive (i)}Difference (SINR _{Targ et (i)}-SINR _{Receive (i)}) and P _{Uniform_allocation (m)}Determine and to distribute to REG _mTransmitting power P _{Dym_PA (m)}, as with (SINR _{Targ_et (i)}-SINR _{Receive (i)}) and P _{Uniform_allocation (m)}Be defined as distributing to REG with value _mTransmitting power P _{Dyn_PA (m)}The embodiment of the invention is at target signal to noise ratio SINR _{Targ et (i)}With received signal to noise ratio SINR _{Receive (i)}Magnitude relationship, can basis | SINR _{Targ et (i)}-SINR _{Receive (i)}| and P _{Uniform_allocation (m)}, determine and to distribute to REG _mTransmitting power P _{Dyn_PA (m)}With UE _iDown control channel in the transmitting power of all REG correspondences and the value transmitting power that is defined as down control channel

Can be as shown in the formula shown in (4):

$P_{{\mathrm{UE}}_i}=\underset{1}{\overset{M}{\mathrm{\Σ}}}{P}_{\mathrm{dyn}\_\mathrm{PA}\left(m\right)}$ Formula (4)

Above-mentioned according to UE _iDown control channel received signal to noise ratio SINR _{Receive (i)}With target signal to noise ratio SINR _{Targ et (i)}Difference | SINR _{Targ et (i)}-SINR _{Receive (i)}| and P _{Uniform_allocation (m)}, determine to distribute to REG _mTransmitting power P _{Dyn_PA (m)}, can be as follows:

Work as SINR _{Receive (i)}〉=SINR _{Targ et (i)}The time, determine to distribute to REG _mTransmitting power P _{Dyn_PA (m)}Can be as shown in the formula shown in (5):

P _{Dyn_PA (m)}=P _{Uniform_allocation (m)}-| SINR _{Targ et (i)}-SINR _{Receive (i)}| formula (5);

Work as SINR _{Receive (i)}＜SINR _{Targ et (i)}The time, determine to distribute to REG _mTransmitting power P _{Dyn_PA (m)}Can be as shown in the formula shown in (6):

P _{Dyn_PA (m)}=P _{Uniform_allocation (m)}+ | SINR _{Targ et (i)}-SINR _{Receive (i)}| formula (6).

In above-mentioned formula (5) and the formula (6), P _{Dyn_PA (m)}For distributing to REG _mTransmitting power, P _{Uniform_allocation (m)}For the rated power according to the base station is distributed to REG _mPower, | SINR _{Targ et (i)}-SINR _{Receive (i)}| be received signal to noise ratio SINR _{Receive (i)}With target signal to noise ratio SINR _{Targ et (i)}Difference.

Preferably, the down control channel in the embodiment of the invention is the PDCCH channel.

Preferably, above-mentioned flow process can also comprise:

Step 104, with UE _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}Send to the link circuit self-adapting unit of base station, so that this link circuit self-adapting unit is according to this target signal to noise ratio SINR _{Targ et (i)}With this UE _iThe DCI information of down control channel carrying, determine UE _iThe PDCCH form.

UE is determined in the link circuit self-adapting unit _iThe PDCCH form, can obtain in the following ways: according to UE _iThe target signal to noise ratio SINR of down control channel _{Targ et (i)}, determine UE _iThe highest code check CR of current support _{UE (i)}According to the highest code check CR _{UE (i)}And UE _iThe bit length of DCI information, determine UE _iThe PDCCH form.

In the embodiment of the invention, determining UE _iThe PDCCH form after, can also be according to UE _iRNTI (Radio Network Temporary Identity, Radio Network Temporary Identifier) and current time slots number determine corresponding polymerization grade (this polymerization grade is meant the aforementioned polymerization grade that is used for determining the receiving terminal signal to noise ratio correspondence of target signal to noise ratio) PDCCH search volume down; And when carrying out the PDCCH resource allocation, seek available resources in the PDCCH search volume of this polymerization grade and finish the PDCCH resource allocation.

In the embodiment of the invention, at the time domain scheduling output uplink and downlink UE formation in each UE, according to (the Multiple-Input Multiple-Out-put of MIMO in the present mode, multiple-input and multiple-output) result of the selection of mode or switching, determine the DCI format that this UE uses, and determine the information bit number of the employed DCI format of described UE according to system bandwidth, antenna port number, system's duplex mode.As: at FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) in the system, system bandwidth is 20M, and the antenna port number is 2, determines that then PDCCH resource (the PDCCH resource is represented with CCE quantity) required after the information bit number of each DCI format and 1/3 convolutional encoding is as shown in table 2; At TDD ((TimeDivision Duplex, time division duplex) in the system, system bandwidth is 20M, and the antenna port number is 2, determines that then PDCCH resource (the PDCCH resource is represented with CCE quantity) required after the information bit number of each DCI format and 1/3 convolutional encoding is as shown in table 3.

Table 2 is that 20M, antenna port are the signal table of information bit number of 2 o'clock various DCI format for system bandwidth in the FDD system

DCI?format	Information bit number	Coded data b it number/CCE number
			0	28	84/2
1	39	117/2
			1A	28	84/2
1B	30	90/2
			1C	15	45/4
1D	30	90/2
			2	51	153/4
2A	48	144/2
			2B	48	144/2
3/3A	28	84/2

Table 3 is in the TDD system, and system bandwidth is 20M, and antenna port is that the information bit of 2 o'clock various DCIformat counts the signal table

DCI?format	Information bit number	Coded data b it number/CCE number
			0	31	93/2
1	42	126/2
			1A	31	93/2

2	54	162/4
			2A	51	153/4
3/3A	31	93/2
			1B	33	99/2
1C	13	39/4
			1D	33	99/2

In above-mentioned table 2 and the table 3, when being 1C owing to DCI format form, only support the common search space, therefore minimum CCE number is 4.

Based on the identical design of said method flow process, the embodiment of the invention also provides a kind of device for down control channel distribution power, and the structure of this device as shown in Figure 2.

Referring to Fig. 2, for distribute the structural representation of the device of power in the embodiment of the invention for down control channel, this device comprises:

Received signal to noise ratio determining unit 21 is used for the descending channel information according to the user, determines the received signal to noise ratio of described user's down control channel;

Target signal to noise ratio determining unit 22 is used to determine the target signal to noise ratio of described user's down control channel;

Transmitting power determining unit 23 is used for the described target signal to noise ratio that the described received signal to noise ratio determined according to received signal to noise ratio determining unit 21 and target signal to noise ratio unit 22 are determined, and determines the transmitting power of described user's down control channel.

Preferably, received signal to noise ratio determining unit 21 specifically is used for: the received signal to noise ratio of determining described down control channel according to the received signal to noise ratio of described descending channel information Physical Downlink Shared Channel PDSCH.

Received signal to noise ratio determining unit 21 specifically is used for: according to the coded system difference between described PDSCH and the described down control channel, code length difference, antenna transmission mode difference, the received signal to noise ratio of described PDSCH is revised or reconstruct, obtain the received signal to noise ratio that received signal to noise ratio is described down control channel, concrete adopted aforementioned manner does not repeat them here.

Preferably, target signal to noise ratio determining unit 22 specifically is used for: choose DCI form and multiple polymerization grade; At every kind of polymerization grade, determine described DCI form and adopt the needed receiving terminal signal to noise ratio of this kind polymerization grade; According to this, obtain a plurality of one to one receiving terminal signal to noise ratios of a plurality of and described multiple polymerization grade; Determine the target signal to noise ratio of described user's down control channel according to described a plurality of receiving terminal signal to noise ratios.

Preferably, target signal to noise ratio determining unit 22 specifically is used for: the target signal to noise ratio that the receiving terminal signal to noise ratio of described a plurality of receiving terminal signal to noise ratio value minimums is defined as described user's down control channel; Perhaps, the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference is defined as the target signal to noise ratio of described user's down control channel with value; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching, and the received signal to noise ratio of choosing is defined as the target signal to noise ratio of described user's down control channel with described received signal to noise ratio; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching, and the received signal to noise ratio chosen and described presence of intercell interference undulating value be defined as the target signal to noise ratio of described user's down control channel with value with described received signal to noise ratio.Above-mentioned several mode can not repeat them here as previously mentioned.

Preferably, transmitting power determining unit 23 specifically is used for: at each physical resource particle group of down control channel of described user, determine and distribute to first transmitting power of this physical resource particle group according to the rated power of base station; According to the difference and described first transmitting power of described received signal to noise ratio and described target signal to noise ratio, determine second transmitting power that to distribute to described physical resource particle group; Second transmitting power of each physical resource particle group correspondence in described user's the down control channel is defined as the transmitting power of described down control channel with value.

Preferably, transmitting power determining unit 23 is determined second transmitting power that need distribute to described physical resource particle group, specifically be used for: with described difference and the described first transmitting power addition, what obtain is defined as distributing to second transmitting power of described physical resource particle group with value.

Preferably, the target signal to noise ratio of the described user's that target signal to noise ratio determining unit 22 will be determined down control channel sends to the link circuit self-adapting unit of base station, so that described link circuit self-adapting unit is according to described target signal to noise ratio, determine the highest code check of the current support of described user, and determine described user's PDCCH form according to the length of the highest described code check and described DCI information.

The embodiment of the invention also provides a kind of base station, is provided with the above-mentioned device that distributes power for down control channel in this base station.

In the embodiment of the invention, the base station can also comprise the link circuit self-adapting unit 31 that is connected with the target signal to noise ratio determining unit 22 of described device, the resource allocation unit 32 that is connected with transmitting power determining unit 23, and the structure of this base station can be as shown in Figure 3, wherein:

Link circuit self-adapting unit 31 is used for the target signal to noise ratio of the user's that receiving target signal to noise ratio determining unit 22 sends down control channel, and according to the DCI information of the down control channel carrying of this target signal to noise ratio and described user terminal, determines the PDCCH form;

Resource allocation unit 32, the PDCCH form that is used for determining, user's RNTI and current time slots number according to described link circuit self-adapting unit 31, determine the PDCCH search volume of this PDCCH form correspondence, and finish the PDCCH resource allocation according to this PDCCH search volume.

Link circuit self-adapting unit 31 in the embodiment of the invention and the functional unit of resource allocation unit 32 for having realized in the prior art base station do not repeat them here.

Adopt technical solution of the present invention,, determine the received signal to noise ratio of described user's down control channel according to user's descending channel information; Determine the target signal to noise ratio of described user's down control channel; According to the received signal to noise ratio and the target signal to noise ratio of described user's down control channel, determine the transmitting power of described user's down control channel.Adopt technical solution of the present invention, coming according to the received signal to noise ratio of user's down control channel and target signal to noise ratio is that this down control channel distributes transmitting power, thereby make the receiving ability that to guarantee this down control channel for the transmitting power of down control channel distribution, improved and be down control channel distribution rational power, thereby the receptivity and the minizone co-channel interference that has reduced down control channel of each user's down control channel have been improved, promote cell spectrum efficient, improved the reliability and stability of carrying out identical networking in the LTE system.

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 (17)

1. the method for down control channel distribution power is characterized in that, comprising:

According to user's descending channel information, determine the received signal to noise ratio of described user's down control channel;

Determine the target signal to noise ratio of described user's down control channel;

According to described received signal to noise ratio and described target signal to noise ratio, determine the transmitting power of described user's down control channel.

2. the method for claim 1 is characterized in that, described descending channel information comprises the received signal to noise ratio of described user's Physical Downlink Shared Channel PDSCH;

Determine the received signal to noise ratio of described user's down control channel, comprising:

According to the coded system difference between described PDSCH and the described down control channel, code length difference, antenna transmission mode difference, the received signal to noise ratio of described PDSCH is revised or reconstruct, obtained the received signal to noise ratio that received signal to noise ratio is defined as described down control channel.

3. the method for claim 1 is characterized in that, the described target signal to noise ratio of determining described user's down control channel comprises:

Choose Downlink Control Information DCI form and multiple polymerization grade;

At every kind of polymerization grade, determine described DCI form and adopt the needed receiving terminal signal to noise ratio of this kind polymerization grade; According to this, obtain a plurality of one to one receiving terminal signal to noise ratios of a plurality of and described multiple polymerization grade;

Determine the target signal to noise ratio of described user's down control channel according to described a plurality of receiving terminal signal to noise ratios.

4. method as claimed in claim 3 is characterized in that, describedly determines the target signal to noise ratio of described user's down control channel according to described a plurality of receiving terminal signal to noise ratios, comprising:

The receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as the target signal to noise ratio of described user's down control channel;

Perhaps, with the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference and value, be defined as the target signal to noise ratio of described user's down control channel;

Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching, and the received signal to noise ratio of choosing is defined as the target signal to noise ratio of described user's down control channel with described received signal to noise ratio;

Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio, and with the received signal to noise ratio chosen and described presence of intercell interference undulating value and value, be defined as the target signal to noise ratio of described user's down control channel.

5. the method for claim 1 is characterized in that, the described transmitting power of determining described user's down control channel comprises:

At each physical resource particle group in described user's the down control channel, determine and distribute to first transmitting power of this physical resource particle group according to the rated power of base station; According to the difference of described target signal to noise ratio and described received signal to noise ratio, described first transmitting power, determine second transmitting power that to distribute to described physical resource particle group;

Second transmitting power of each physical resource particle group correspondence in described user's the down control channel is defined as the transmitting power of described down control channel with value.

6. method as claimed in claim 5 is characterized in that, described second transmitting power that need distribute to described physical resource particle group of determining comprises:

With described difference and the described first transmitting power addition, what obtain is defined as distributing to second transmitting power of described physical resource particle group with value.

7. as each described method of claim 1～6, it is characterized in that described down control channel is a physical downlink control channel PDCCH.

8. method as claimed in claim 7 is characterized in that, also comprises:

The target signal to noise ratio of described user's down control channel is sent to the link circuit self-adapting unit of base station, so that described user's PDCCH form is determined in described link circuit self-adapting unit according to described target signal to noise ratio.

9. method as claimed in claim 8 is characterized in that, the described PDCCH form of determining described user comprises:

According to described target signal to noise ratio, determine the highest code check of the current support of described user;

Determine described user's PDCCH form according to the length of the highest described code check and described DCI information.

10. the device for down control channel distribution power is characterized in that, comprising:

The received signal to noise ratio determining unit is used for the descending channel information according to the user, determines the received signal to noise ratio of described user's down control channel;

The target signal to noise ratio determining unit is used to determine the target signal to noise ratio of described user's down control channel;

The transmitting power determining unit is used for the described target signal to noise ratio that the described received signal to noise ratio determined according to described received signal to noise ratio determining unit and described target signal to noise ratio unit are determined, and determines the transmitting power of described user's down control channel.

11. device as claimed in claim 10, it is characterized in that, the received signal to noise ratio determining unit specifically is used for: according to the coded system difference between described PDSCH and the described down control channel, code length difference, antenna transmission mode difference, the received signal to noise ratio of described PDSCH is revised or reconstruct, obtained the received signal to noise ratio that received signal to noise ratio is described down control channel.

12. device as claimed in claim 10 is characterized in that, described target signal to noise ratio determining unit specifically is used for: choose Downlink Control Information DCI form and multiple polymerization grade;

At every kind of polymerization grade, determine described DCI form and adopt the needed receiving terminal signal to noise ratio of this kind polymerization grade; According to this, obtain a plurality of one to one receiving terminal signal to noise ratios of a plurality of and described every kind of polymerization grade;

Determine the target signal to noise ratio of described user's down control channel according to described a plurality of receiving terminal signal to noise ratios.

13. device as claimed in claim 12 is characterized in that, described target signal to noise ratio determining unit specifically is used for:

The receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as the target signal to noise ratio of described user's down control channel;

Perhaps, the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference is defined as the target signal to noise ratio of described user's down control channel with value;

Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching, and the received signal to noise ratio of choosing is defined as the target signal to noise ratio of described user's down control channel with described received signal to noise ratio;

Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching, and the received signal to noise ratio chosen and described presence of intercell interference undulating value be defined as the target signal to noise ratio of described user's down control channel with value with described received signal to noise ratio.

14. device as claimed in claim 10, it is characterized in that, the transmitting power determining unit specifically is used for: at each physical resource particle group of down control channel of described user, determine and distribute to first transmitting power of this physical resource particle group according to the rated power of base station; According to the difference and described first transmitting power of described received signal to noise ratio and described target signal to noise ratio, determine second transmitting power that to distribute to described physical resource particle group;

Second transmitting power of each physical resource particle group correspondence in described user's the down control channel is defined as the transmitting power of described down control channel with value.

15. device as claimed in claim 14 is characterized in that, described transmitting power determining unit is determined second transmitting power that need distribute to described physical resource particle group, specifically is used for:

With described difference and the described first transmitting power addition, what obtain is defined as distributing to second transmitting power of described physical resource particle group with value.

16. as each described device of claim 10～15, it is characterized in that, the target signal to noise ratio of the described user's that described target signal to noise ratio determining unit will be determined down control channel sends to the link circuit self-adapting unit of base station, so that described link circuit self-adapting unit is according to described target signal to noise ratio, determine the highest code check of the current support of described user, and determine described user's PDCCH form according to the length of the highest described code check and described DCI information.

17. a base station is characterized in that, comprises as each described device of claim 10～16.

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