CN101888692A

CN101888692A - Downlink power control method and device

Info

Publication number: CN101888692A
Application number: CN2009100840003A
Authority: CN
Inventors: 徐婧; 潘学明; 肖国军; 孙韶辉
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2009-05-13
Filing date: 2009-05-13
Publication date: 2010-11-17
Anticipated expiration: 2029-05-13
Also published as: CN101888692B

Abstract

The invention discloses a downlink power control method and a downlink power control device. The method comprises the following steps that: a base station side sends the cell dedicated parameter of EPRE information which at least contains common pilot frequency and user dedicated EPRE related information, and sends the correction information of different user power to a terminal side; the terminal side detects and recovers the received data from the base station side according to the cell dedicated parameter, the user dedicated EPRE related information and the correction information of different user power; and the base station side distributes each symbol power value on a resource block to be sent according to the cell dedicated parameter, the user dedicated EPRE related information and the correction information of different user power and sending the resource block. The method can well improve the error code performance and the capacity of a system.

Description

A kind of method for controlling downlink power and device

Technical field

The present invention relates to communication technical field, be meant a kind of method for controlling downlink power and device especially.

Background technology

The MIMO technology is played an important role in communication system of new generation as the important raising transmission quality and the physical layer multi-antenna technology of efficient.For example, the LTE system just supports transmit diversity, space multiplexing technique and beam shaping multiple MIMO technology such as (BF, Beam forming).At present, in the LTE system, downlink precoding (percoding) can be handled a plurality of code word (codewords simultaneously, a plurality of code words may also may be from same user's different data source from same user's same data source), in order to improve the throughput and different form of services of system under better transmission conditions; Then only support single data stream (the corresponding data source of data flow of stream) transmission for beam shaping.Along with the further evolution of LTE standard, downlink transfer is supported 8 streams at most, and BF supports 2 streams.The pilot configuration based on stream of user commissioner's office, i.e. dedicated pilot (DRS) are adopted in descending demodulation.Down-run survey adopts the pilot configuration of sub-district commissioner's office, i.e. public guide frequency.

Transmission has following regulation to the downlink wave beam excipient in the LTE system:

The beam shaping user uses user dedicated reference symbols (UE-specific reference signals) the descending shared service channel of demodulation (PDSCH); User dedicated reference symbols only is mapped in excipient and transmits in the employed Resource Block; User dedicated reference symbols only takies an antenna port (being antenna port 5) and shines upon; Whether the high-rise notice terminal that needs has used user dedicated reference symbols (promptly whether carrying out beamforming transmission); When carrying out beamforming transmission, the sub-district dedicated reference symbols on the reserved port 0,1 (Cell-specific reference signals), the sub-district dedicated reference symbols on the port 2,3 is no longer available.

The resource of user dedicated reference symbols is shone upon as shown in Figure 1, and wherein the space is the Resource Unit (RE) of data symbol mapping, and grid is the mapping RE of sub-district dedicated reference symbols (CRS), and R5 is the mapping RE of user dedicated reference symbols.The symbol energy that defines simultaneously on each RE is EPRE.

The LTE standard was determined already at present, and user dedicated reference symbols only takies port 5 and transmits.Also want reserved port 0 when carrying out the excipient transmission, sub-district dedicated reference symbols on 1, be for the non-excipient control channel in demodulation part (this local channel uses beamforming transmission never), as: down control channel (PDCCH:Physical Downlink Control channel), broadcast channel (PBCH:Physical Broadcast channel), Dynamic Broadcast Channel (DBCH:Dynamic BCH) etc., guarantee that simultaneously CQI estimates and carry out the sub-district to switch preceding to RSRP (Reference Signal Received Power, Reference Signal Received Power), the surveying work of RSRQ (Reference Signal Received Quality, Reference Signal Received Quality) can normally carry out.

The detailed process of the CRS power control of LTE regulation is as follows at present:

(1) the broadcast channel broadcasts parameter P of base station side _CRSAnd p _BP wherein _CRSEPRE for cell reference symbols.p _BThe ratio of the actual EPRE of the data in the EPRE that expression comprises the data symbol in OFDM (OFDM) symbol of common reference symbol and the OFDM symbol that does not comprise cell reference symbols.Wherein, the ratio (ρ that does not comprise the EPRE of the actual EPRE of the data in the OFDM symbol of cell reference symbols and cell reference signals _A) be:

When terminal has received the data of the transmission diversity mode transmission of adopting 4 antenna ports,

ρ _A＝δ _power-offset+P _A+10log ₁₀

Other situations, ρ _A=δ _Power-offset+ P _A

(2) base station side RRC signaling sends parameter p _A, p _ABe the initial EPRE of data in the OFDM symbol that does not include reference symbol among Fig. 1 and the ratio of the EPRE of cell reference symbols.

(3) the base station side physical layer signaling sends parameter δ _Power-offset, under its expression multi-user mode, the correction of different user power.Under the single user mode, δ _Power-offset=0dB, under the multi-user mode, δ _Power-offsetIndicate by DCI.

(4) base station side will distribute the data of power and reference symbol to send by the modulation back in the lump according to parameter and transmission pattern sets in (1), (2), (3).

(5) end side receives broadcasting, signaling and the information symbol that base station side sends.

(6) end side receives broadcast message, the RRC signaling information, and DCI information, and can draw the EPRE of corresponding data symbol and the ratio of reference signal EPRE by calculating.

(7) end side is carried out channel estimating by cell reference symbols, and the ratio of the EPRE of the data symbol that is calculated in the associating (6) and reference signal EPRE detects recovery to receiving data.

The used parameter and the flow process of the control of the CRS of LTE system power have more than been narrated.

At present in the LTE standard, CRS has supported pilot power to promote, and pilot power promotes obviously under the result QPSK modulation system that promotes, and the lifting effect of 64QAM is also not obvious.But the LTE-A system does not stipulate the downlink reference signal power ascension, but the downlink reference signal power ascension provides the support on the systematic function for the user.

Summary of the invention

The invention provides a kind of method for controlling downlink power and device, in order to improve the error performance of system.

A kind of method for controlling downlink power that the embodiment of the invention provides comprises:

Base station side sends the exclusive parameter in sub-district of the EPRE information contain public guide frequency at least by high-level signaling and at user's EPRE relevant information, and sends the update information of different user power to end side;

The exclusive parameter in described sub-district, be used to offer described end side at the update information of user's EPRE relevant information and different user power the data that the base station side that receives sends are detected recovery;

Base station side is distributed each the symbol power value on the Resource Block that will send according to the exclusive parameter in described sub-district, at the parameter in the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.

A kind of base station that the embodiment of the invention provides comprises:

Power divider is used for according to channel quality status, determines corresponding sending mode and power contorl parameters;

Signaling is broadcast device, is used to send the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at user's EPRE relevant information; Send the update information of different user power to end side;

The information symbol generator is used for according to the exclusive parameter in described sub-district, distributes each symbol power value on the Resource Block that will send at the parameter of the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.

A kind of method that receives data that the embodiment of the invention provides comprises:

End side receives and demodulation obtains the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least that base station side sends, at user's the EPRE relevant information and the update information of different user power;

End side receives reference symbol and carries out channel estimating, data symbol EPRE that utilizes the exclusive parameter in described sub-district, calculates at the update information of user's EPRE relevant information and different user power and the ratio of demodulation pilot frequency EPRE detect recovery to the reference symbol that receives.

A kind of terminal that the embodiment of the invention provides comprises:

The control information receiver, be used to receive and demodulation obtains the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least that base station side sends, at user's the EPRE relevant information and the update information of different user power;

Channel estimator is used to receive reference symbol and carries out channel estimating;

The information symbol demodulator, data symbol EPRE that is used to utilize the exclusive parameter in described sub-district, calculates at the update information of user's EPRE relevant information and different user power and the ratio of demodulation pilot frequency EPRE detect recovery to the reference symbol that receives.

In the embodiment of the invention, base station side sends the exclusive parameter in sub-district of the EPRE information contain public guide frequency at least and at user's EPRE relevant information, and sends the update information of different user power to end side; Base station side is distributed each the symbol power value on the Resource Block that will send according to the exclusive parameter in described sub-district, at the parameter in the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.End side receives reference symbol and carries out channel estimating, data symbol EPRE that utilizes the EPRE information of described public guide frequency, calculates at the update information of user's EPRE relevant information and different user power and the ratio of demodulation pilot frequency EPRE detect recovery to the reference symbol that receives.Use this method, can improve the error performance and the capacity of system preferably.

Description of drawings

Fig. 1 is user's DRS (Dedicated Reference Signal) mapping schematic diagram;

Fig. 2 is the schematic flow sheet of the method for the embodiment of the invention;

Fig. 3 is the embodiment of the invention realizes descending power control in base station side a schematic flow sheet;

Fig. 4 detects the schematic flow sheet of recovery to the reception data in end side for the embodiment of the invention;

Fig. 5 is the system configuration schematic diagram of the embodiment of the invention.

Embodiment

In embodiments of the present invention, base station side sends the exclusive parameter in sub-district of the EPRE information contain public guide frequency at least and at user's EPRE relevant information, and sends the update information of different user power to end side; The exclusive parameter in described sub-district, be used to offer described end side at the update information of user's EPRE relevant information and different user power the data that the base station side that receives sends are detected recovery; Base station side is distributed each the symbol power value on the Resource Block that will send according to the exclusive parameter in described sub-district, at the parameter in the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.

Referring to shown in Figure 2, base station side realizes that the detailed process of descending power control is as follows in the embodiment of the invention:

Step 201: base station side sends the exclusive parameter in sub-district of the EPRE information contain public guide frequency at least and at user's EPRE relevant information, and sends the update information of different user power to end side;

The exclusive parameter in described sub-district, be used to offer described end side at the update information of user's EPRE relevant information and different user power the data that the base station side that receives sends are detected recovery.

Base station side sends the exclusive parameter in sub-district of the EPRE information contain public guide frequency at least and can realize like this at user's EPRE relevant information: base station side broadcasting contains the exclusive parameter in sub-district of the EPRE information of public guide frequency at least, and sends EPRE relevant information at the user by the RRC signaling to end side.Base station side also can be broadcasted the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at the exclusive part in sub-district in user's the EPRE relevant information, and by RRC signaling user-specific part in end side sends at user's EPRE relevant information.

Step 202: base station side is distributed each the symbol power value on the Resource Block that will send according to the exclusive parameter in described sub-district, at the parameter in the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.

Describedly comprise at least: the EPRE relevant information that does not comprise the data in the OFDM symbol of reference signal at user-specific part in user's the EPRE relevant information, can further include: only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) and/or the EPRE relevant information of dedicated pilot, can further include: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal, and/or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously.

The EPRE relevant information of the data in the described OFDM symbol that does not comprise reference signal comprises: do not comprise the EPRE information of the data in the OFDM symbol of reference signal, or do not comprise the EPRE correlation ratio value information of the data in the OFDM symbol of reference signal;

Data EPRE relevant information in the described OFDM symbol that only comprises DRS (Dedicated Reference Signal), comprise: only comprise the data EPRE information in the OFDM symbol of DRS (Dedicated Reference Signal), or only comprise the data EPRE correlation ratio value information in the OFDM symbol of DRS (Dedicated Reference Signal);

The EPRE relevant information of described dedicated pilot comprises: the EPRE information of dedicated pilot, or the EPRE correlation ratio value information of dedicated pilot.

The EPRE relevant information of the data in the described OFDM symbol that only comprises public reference signal, comprise: only comprise the EPRE information of the data in the OFDM symbol of public reference signal and only comprise the EPRE correlation ratio value information of the data in the OFDM symbol of public reference signal.

The EPRE relevant information of the data in the described OFDM symbol that does not comprise reference signal comprises:

ρ _A/ P _DRSOr E (A)/E (DRS),

Wherein, E (A) expression does not comprise the primary power on each resource element of the data correspondence in the OFDM symbol of reference signal, ρ _AExpression does not comprise the actual energy on each resource element of the data correspondence in the OFDM symbol of reference signal, the primary power on each resource element of E (DRS) expression user-specific pilot tone correspondence, P _DRSActual energy on each resource element of expression user-specific pilot tone correspondence.

Data EPRE relevant information in the described OFDM symbol that only comprises DRS (Dedicated Reference Signal) comprises:

ρ _C/P _DRS、E(C)/E(DRS)、

Wherein, the primary power on each resource element of E (DRS) expression user-specific pilot tone correspondence, P _DRSActual energy on each resource element of expression user-specific pilot tone correspondence, E (C) expression only comprise the primary power on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal), ρ _CExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal).

The EPRE relevant information of the data in the described OFDM symbol that only comprises public reference signal, comprise: do not comprise the data EPRE correlation ratio parameter information in the OFDM symbol of reference signal, or at the indication information of the data EPRE in the described OFDM symbol that does not comprise reference signal;

Data EPRE correlation ratio parameter information in the described OFDM symbol that does not comprise reference signal is:

ρ _B/ P _DRSOr E (B)/E (DRS),

Described indication information at the data EPRE in the described OFDM symbol that does not comprise reference signal is: ρ _B=ρ _COr ρ _B=ρ _A

Wherein, ρ _AExpression does not comprise the actual energy on each resource element of the data correspondence in the OFDM symbol of reference signal, the primary power on each resource element of E (DRS) expression user-specific pilot tone correspondence, P _DRSActual energy on each resource element of expression user-specific pilot tone correspondence, E (B) expression only comprise the primary power on each resource element of the data correspondence in the OFDM symbol of public reference signal, ρ _BExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of public reference signal.

The EPRE relevant information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises:

The EPRE correlation ratio parameter information that comprises the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously, or at the indication information of the EPRE of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency,

The EPRE correlation ratio parameter information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises: ρ _D/ P _DRSOr E (D)/E (DRS),

The indication information of described EPRE at the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency comprises: ρ _D=ρ _C, ρ _D=ρ _B, ρ _D=ρ _AOr ρ _D=ρ _B,

Wherein, ρ _AExpression does not comprise the actual energy on each resource element of the data correspondence in the OFDM symbol of reference signal, the primary power on each resource element of E (DRS) expression user-specific pilot tone correspondence, P _DRSActual energy on each resource element of expression user-specific pilot tone correspondence, ρ _CExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal), ρ _BExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of public reference signal; E (D) expression comprises the primary power on each resource element of the data correspondence in the OFDM symbol of dedicated pilot and public guide frequency, ρ simultaneously _DExpression comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of dedicated pilot and public guide frequency simultaneously.

Each parameter that comprises in the described EPRE relevant information at the user is passed through bit quantization.

The update information of described different user power sends to described end side by DCI, or is included in described at sending to described end side in the actual EPRE information of the dedicated pilot in user's the EPRE relevant information.

Describedly further comprise: ρ at the exclusive part in sub-district in user's the EPRE relevant information _C/ ρ _A, E (C)/E (A), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _A, E (B)/E (A), ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _CAnd among E (D)/E (C) one or several,

Wherein, ρ _AExpression does not comprise the actual energy on each resource element of the data correspondence in the OFDM symbol of reference signal, ρ _BExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of public reference signal, ρ _CExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal), ρ _DExpression comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of dedicated pilot and public guide frequency simultaneously, E (A) expression does not comprise the primary power on each resource element of the data correspondence in the OFDM symbol of reference signal, E (B) expression only comprises the primary power on each resource element of the data correspondence in the OFDM symbol of public reference signal, E (C) expression only comprises the primary power on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal), and E (D) expression comprises the primary power on each resource element of the data correspondence in the OFDM symbol of dedicated pilot and public guide frequency simultaneously.

Referring to shown in Figure 3, receiving data at control procedure end-on shown in Figure 2 in the embodiment of the invention, to detect the method for recovery as follows:

Step 301: end side receives and demodulation obtains the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least that base station side sends, at user's the EPRE relevant information and the update information of different user power;

Step 302: end side receives reference symbol and carries out channel estimating, data symbol EPRE that utilizes the exclusive parameter in described sub-district, calculates at the update information of user's EPRE relevant information and different user power and the ratio of demodulation pilot frequency EPRE detect recovery to the reference symbol that receives.

Be that subsequent descriptions simplifies, data are classified by following rule and name:

The category-A data: do not comprise the data in the OFDM symbol of reference signal, the primary power (EPRE) on its each resource element is with E (A) expression, and actual energy (EPRE) is used ρ _ABoth differences are relevant with transmission mode and list/multi-user mode, and the definition of back is identical.

The category-B data: only comprise the data in the OFDM symbol of public reference signal, the primary power (EPRE) on its each resource element is with E (B) expression, and actual energy (EPRE) is used ρ _B

C class data: only comprise the data in the OFDM symbol of DRS (Dedicated Reference Signal), the primary power (EPRE) on its each resource element is with E (C) expression, and actual energy (EPRE) is used ρ _C

D class data: comprise the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously, the primary power (EPRE) on its each resource element is with E (D) expression, and actual energy (EPRE) is used ρ _D

Dedicated pilot: the pilot tone of user-specific, the primary power (EPRE) on its each resource element, with E (DRS) expression, actual energy (EPRE) is used P _DRSExpression.

Public guide frequency: the pilot tone that the sub-district is exclusive, the energy (EPRE) on its each resource element is used P _CRSExpression.

The scheme of the embodiment of the invention need define new power ratio parameter to LTE-A, directly or indirectly indicates the ratio between various data symbol EPRE and the dedicated pilot EPRE.

The embodiment of the invention is carried out as giving a definition:

(1) P _CRSThe EPRE of expression public guide frequency is by the system broadcasts notice terminal of base station.

(2) δ _Power-offset=Δ/E (DRS), Δ are the corrected outputs of different user.Under this parametric representation multi-user mode, the correction of different user power.Under the single user mode, δ _Power-offset=0dB.This parameter can send to the user by DCI, or is included among the actual EPRE of dedicated pilot.

(3) the user-specific parameter of the relevant ratio of category-A data, indicating means following (wherein a kind of, but be not limited to following definition):

(i) ρ _A/ P _DRSOr E (A)/E (DRS)

(4) parameter of the relevant ratio of C class data, indicating means following (wherein a kind of, but be not limited to following definition):

(i) ρ _C/ P _DRSOr E (C)/E (DRS), the user-specific parameter;

(ii) ρ _C/ ρ _AOr E (C)/E (A), the exclusive parameter in sub-district;

(5) distribution method of category-B data power:

(i) independent allocation increases the parameter of a category-B data EPRE or relevant ratio, its indicating means following (wherein a kind of, but be not limited to following definition):

(i-1) ρ _B/ P _DRSOr E (B)/E (DRS), the user-specific parameter;

(i-2) ρ _B/ ρ _COr E (B)/E (C), the exclusive parameter in sub-district;

(i-3) ρ _B/ ρ _AOr E (B)/E (A), the exclusive parameter in sub-district;

(ii) identical with certain class data, ρ _B=ρ _COr ρ _B=ρ _A

(6) distribution method of D class data power:

(i) identical with certain class data, ρ _D=ρ _COr ρ _D=ρ _BOr ρ _D=ρ _A

(ii) independent allocation, its indicating means of parameter that increases a D class data EPRE or relevant ratio following (wherein a kind of, but be not limited to following definition):

(ii-1) ρ _D/ P _DRSOr E (D)/E (DRS), the user-specific parameter;

(ii-2) ρ _D/ ρ _AOr E (D)/E (A), the exclusive parameter in sub-district;

(ii-3) ρ _D/ ρ _BOr E (D)/E (B), the exclusive parameter in sub-district;

(ii-4) ρ _D/ ρ _COr E (D)/E (C), the exclusive parameter in sub-district, this scheme are only used under C class data EPRE or relevant ratio situation as can be known;

(iii) ρ _D=ρ _B, but the power of the dedicated pilot on this symbol is different with other symbols, and P _DRS=ρ _D

Above-mentioned two parameters are by the N bit quantization, for example with the N=2 bit represent 00,01,10,11}, so the user-specific parameter for dedicated pilot can be expressed as 3,0,3,6}dB, the user-specific parameter of C class data then be expressed as 0.5,0,0.5,1}dB.More than provided an example, wherein N can be other natural number.

Referring to shown in Figure 4, the flow process of embodiment of the invention method is as follows:

Step 401: the broadcast channel broadcasts of base station side comprises the exclusive parameter in sub-district of the EPRE information of public guide frequency, the EPRE information such as the P of public guide frequency at least _CRS

Certainly, the exclusive parameter in described sub-district also can further include: ρ _C/ ρ _A, E (C)/E (A), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _A, E (B)/E (A), ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _CAnd among E (D)/E (C) one or several.

Step 402: base station side sends the RRC signaling, comprising the EPRE relevant information at the user, as category-A data, category-B data, C class data, D class data, the EPRE of dedicated pilot or the parameter of relevant ratio.Wherein, the relevant parameter of category-B data and D class data does not always send, and is relevant with its distribution method.These parameters can adopt the part combined coding, or indication respectively.

Such as: user-specific EPRE correlation ratio value information is: ρ _A/ P _DRS, E (A)/E (DRS), ρ _C/ P _DRS, E (C)/E (DRS), ρ _B/ P _DRS, E (B)/E (DRS), ρ _D/ P _DRSOr E (D)/E (DRS) etc.

Perhaps comprise being expressed as the indication identical with certain class data, such as: ρ _B=ρ _COr ρ _B=ρ _Aρ _D=ρ _C, ρ _D=ρ _B, ρ _D=ρ _AOr ρ _D=ρ _B

Step 403: the base station side physical layer signaling sends power control signaling parameter δ _Power-offset, under its expression multi-user mode, the correction of different user power.Under the single user mode, δ _Power-offset=0dB, under the multi-user mode, δ _Power-offsetIndicate by DCI.δ _Power-offsetIf be included among the EPRE of dedicated pilot, then do not need this step.

Step 404: base station side is distributed each the symbol power value that sends on the Resource Block according to parameter in 401～403 and is sent.

Step 405: end side receives broadcast message, signaling information and the data message that base station side sends.

Step 406: end side demodulates the exclusive parameter in sub-district.

Step 407: end side demodulates the EPRE relevant information at the user in the RRC signaling, as the category-A data, and category-B data, C class data, D class data, the user-specific parameter of the EPRE of dedicated pilot or relevant ratio.Wherein, the user-specific parameter of category-B data and D class data does not always send, and is relevant with its distribution method.

Step 408: end side demodulates power control signaling parameter δ among the DCI _Power-offset, δ _Power-offsetIf be included among the EPRE of dedicated pilot, then do not need this step.

Step 409: end side receives reference symbol and also carries out channel estimating, and the data symbol EPRE and the ratio of demodulation pilot frequency EPRE that unite in 406～408 to be calculated, and the reception data are detected recovery.

Referring to shown in Figure 5, the descending power control device that the embodiment of the invention provides comprises base station 60 and terminal 70.

Base station 60 comprises: power divider 61, broadcast message are broadcast device 62 and information symbol generator 63.

Power divider 61 is used for according to channel quality status, determines corresponding sending mode and power contorl parameters;

Signaling is broadcast device 62, is used to send the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at user's EPRE relevant information; Send the update information of different user power to end side;

Information symbol generator 63 is used for according to the exclusive parameter in described sub-district, distributes each symbol power value on the Resource Block that will send at the parameter of the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.

Signaling is broadcast device 62 and comprised: broadcast message is broadcast device 621 and at user's EPRE relevant information and power correction information distributing device 622.

Broadcast message is broadcast device 621, is used to broadcast the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least;

At user's EPRE relevant information and power correction information distributing device 622, be used for sending and comprise at the RRC signaling of user's EPRE relevant information and the update information of different user power to end side;

Described EPRE relevant information and power correction information distributing device 622 at the user, comprising: the RRC signaling broadcasts device 6221 and physical layer signaling is broadcast device 6222.The RRC signaling is broadcast device 6221, is used for sending the RRC signaling that comprises at user's EPRE relevant information to end side; Physical layer signaling is broadcast device 6222, is used for sending to end side by DCI the update information of different user power.

Another execution mode, broadcast message are broadcast device 621, can be used for broadcasting the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at the exclusive part in sub-district of user's EPRE relevant information; At user's EPRE relevant information and power correction information distributing device 622, be used for sending and comprise at the RRC signaling of user's EPRE relevant information remainder and the update information of different user power to end side.The RRC signaling is broadcast device 6221, is used for sending the RRC signaling that comprises at user's EPRE relevant information user-specific part to end side; Physical layer signaling is broadcast device 6222, is used for sending to end side by DCI the update information of different user power.

Terminal 70 comprises: control information receiver 71, channel estimator 72 and information symbol demodulator 73.

Control information receiver 71, be used to receive and demodulation obtains the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least that base station side sends, at user's the EPRE relevant information and the update information of different user power;

Channel estimator 72 is used to receive reference symbol and carries out channel estimating;

Information symbol demodulator 73, data symbol EPRE that is used to utilize the exclusive parameter in described sub-district, calculates at the update information of user's EPRE relevant information and different user power and the ratio of demodulation pilot frequency EPRE detect recovery to the reference symbol that receives.

In embodiments of the present invention, described EPRE relevant information and power correction information distributing device at the user can include only: the RRC signaling is broadcast device.The RRC signaling was broadcast device and was used for sending the RRC signaling that comprises at user's EPRE relevant information to end side this moment, wherein, described EPRE relevant information at the user comprises in the actual EPRE information of dedicated pilot at least, and the actual EPRE information of described dedicated pilot comprises the update information of different user power.

Described EPRE relevant information at the user comprises at least: do not comprise the EPRE relevant information of the data in the OFDM symbol of reference signal, further can also comprise: only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) and/or the EPRE relevant information of dedicated pilot.

Described EPRE relevant information at the user also further comprises: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal and/or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously.

ρ _A/ P _DRSOr E (A)/E (DRS),

ρ _C/ P _DRS, E (C)/E (DRS), ρ _C/ ρ _AOr E (C)/E (A),

ρ _B/ P _DRS, E (B)/E (DRS), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _AOr E (B)/E (A),

Described indication information to the data EPRE in the described OFDM symbol that does not comprise reference signal is: ρ _B=ρ _COr ρ _B=ρ _A

The EPRE relevant information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously, comprise: the EPRE correlation ratio parameter information that comprises the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously, or at the indication information of the EPRE of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency

The EPRE correlation ratio parameter information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises: ρ _D/ P _DRS, E (D)/E (DRS), (ii-2) ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _COr E (D)/E (C),

Wherein, E (A) expression does not comprise the primary power on each resource element of the data correspondence in the OFDM symbol of reference signal, ρ _AExpression does not comprise the actual energy on each resource element of the data correspondence in the OFDM symbol of reference signal, the primary power on each resource element of E (DRS) expression user-specific pilot tone correspondence, P _DRSActual energy on each resource element of expression user-specific pilot tone correspondence, E (C) expression only comprise the primary power on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal), ρ _CExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of DRS (Dedicated Reference Signal), and E (B) expression only comprises the primary power on each resource element of the data correspondence in the OFDM symbol of public reference signal, ρ _BExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of public reference signal; E (D) expression comprises primary power (EPRE) on each resource element of the data correspondence in the OFDM symbol of dedicated pilot and public guide frequency simultaneously with representing ρ _DExpression comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of dedicated pilot and public guide frequency simultaneously.

The embodiment of the invention has provided Downlink Power Control Schemes and corresponding device thereof, when realizing descending power control, can reduce the expense of LTE-A system control signaling, reduce the complexity that the reference symbol wattmeter promotes, and help improving the error performance of system.User's information throughput is increased.

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. a method for controlling downlink power is characterized in that, this method may further comprise the steps:

Base station side sends the exclusive parameter in sub-district of the symbol energy EPRE information contain public guide frequency at least and at user's OFDM EPRE relevant information, and sends the update information of different user power to end side;

The EPRE information of described public guide frequency, be used to offer described end side at the update information of user's EPRE relevant information and different user power the data that the base station side that receives sends are detected recovery;

Base station side is according to the EPRE information of described public guide frequency, distribute each symbol power value on the Resource Block that will send at the parameter in the update information of user's EPRE relevant information and described different user power, and sends described Resource Block.

2. the method for claim 1 is characterized in that, described base station side sends the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at user's EPRE relevant information, comprising:

Base station side broadcasting contains the exclusive parameter in sub-district of the EPRE information of public guide frequency at least, and passes through the RRC signaling to the EPRE relevant information of end side transmission at the user.

3. method as claimed in claim 2 is characterized in that, described EPRE relevant information at the user comprises at least: the EPRE relevant information that does not comprise the data in the OFDM symbol of reference signal; Only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) and/or the EPRE relevant information of dedicated pilot,

4. method as claimed in claim 3, it is characterized in that, described EPRE relevant information at the user also further comprises: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal, or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously;

5. the method for claim 1 is characterized in that, described base station side sends the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at user's EPRE relevant information, comprising:

Base station side broadcasting contain at least public guide frequency EPRE information the exclusive parameter in sub-district and at the exclusive part in sub-district in user's the EPRE relevant information;

Base station side is by the part of RRC signaling user-specific in end side sends at user's EPRE relevant information.

6. method as claimed in claim 5 is characterized in that, described part at user-specific in user's the EPRE relevant information comprises at least: do not comprise the EPRE relevant information of the data in the OFDM symbol of reference signal,

Described part at user-specific in user's the EPRE relevant information also further comprises: only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) and/or the EPRE relevant information of dedicated pilot,

7. method as claimed in claim 6, it is characterized in that, described part at user-specific in user's the EPRE relevant information also further comprises: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal, or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously;

8. as claim 3 or 6 described methods, it is characterized in that the EPRE relevant information of the data in the described OFDM symbol that does not comprise reference signal comprises:

ρ _A/ P _DRSOr E (A)/E (DRS),

9. as claim 3 or 6 described methods, it is characterized in that the data EPRE relevant information in the described OFDM symbol that only comprises DRS (Dedicated Reference Signal) comprises:

ρ _C/P _DRS、E(C)/E(DRS)、

10. as claim 4 or 7 described methods, it is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that only comprises public reference signal, comprise: do not comprise the data EPRE correlation ratio parameter information in the OFDM symbol of reference signal, or at the indication information of the data EPRE in the described OFDM symbol that does not comprise reference signal;

ρ _B/ P _DRSOr E (B)/E (DRS),

11., it is characterized in that the EPRE relevant information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises as claim 4 or 7 described methods:

12. the method for claim 1 is characterized in that, described each parameter that comprises at the part of user-specific in user's the EPRE relevant information is passed through bit quantization.

13. the method for claim 1, it is characterized in that, the update information of described different user power sends to described end side by DCI, or is included in described at sending to described end side in the actual EPRE information of the dedicated pilot in user's the EPRE relevant information.

14. method as claimed in claim 5 is characterized in that, describedly further comprises at the exclusive part in sub-district in user's the EPRE relevant information: ρ _C/ ρ _A, E (C)/E (A), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _A, E (B)/E (A), ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _CAnd among E (D)/E (C) one or several,

15. a base station is characterized in that, comprising:

16. base station as claimed in claim 15 is characterized in that, described signaling is broadcast device, comprising:

Broadcast message is broadcast device, is used to broadcast the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least;

At user's EPRE relevant information and power correction information distributing device, be used for sending and comprise at the RRC signaling of user's EPRE relevant information and the update information of different user power to end side.

17. base station as claimed in claim 15 is characterized in that, described signaling is broadcast device, comprising:

Broadcast message is broadcast device, is used for broadcasting the exclusive parameter in sub-district of the EPRE information that contains public guide frequency at least and at user's the exclusive part in EPRE relevant information sub-district;

At user's EPRE relevant information and power correction information distributing device, be used for sending and comprise at the RRC signaling of the part of user's EPRE relevant information user-specific and the update information of different user power to end side.

18. base station as claimed in claim 16 is characterized in that, described EPRE relevant information and power correction information distributing device at the user comprise:

The RRC signaling is broadcast device, is used for sending the RRC signaling that comprises at user's EPRE relevant information to end side;

Physical layer signaling is broadcast device, is used for sending to end side by DCI the update information of different user power.

19. base station as claimed in claim 15 is characterized in that, described EPRE relevant information and power correction information distributing device at the user, for:

The RRC signaling is broadcast device, be used for sending the RRC signaling that comprises at user's EPRE relevant information to end side, wherein, described EPRE relevant information at the user comprises in the actual EPRE information of dedicated pilot at least, and the actual EPRE information of described dedicated pilot comprises the update information of different user power.

20. base station as claimed in claim 15 is characterized in that, described part at user-specific in user's the EPRE relevant information comprises at least: do not comprise the EPRE relevant information of the data in the OFDM symbol of reference signal,

Described part at user-specific in user's the EPRE relevant information further comprises: only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) and/or the EPRE relevant information of dedicated pilot;

21. base station as claimed in claim 20, it is characterized in that described part at user-specific in user's the EPRE relevant information further comprises: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal and/or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously;

22. base station as claimed in claim 20 is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that does not comprise reference signal comprises:

ρ _A/ P _DRSOr E (A)/E (DRS),

23. base station as claimed in claim 20 is characterized in that, the data EPRE relevant information in the described OFDM symbol that only comprises DRS (Dedicated Reference Signal) comprises:

ρ _C/ P _DRSOr E (C)/E (DRS),

24. base station as claimed in claim 20, it is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that only comprises public reference signal, comprise: do not comprise the data EPRE correlation ratio parameter information in the OFDM symbol of reference signal, or at the indication information of the data EPRE in the described OFDM symbol that does not comprise reference signal;

ρ _B/ P _DRSOr E (B)/E (DRS),

Wherein, the primary power on each resource element of E (DRS) expression user-specific pilot tone correspondence, P _DRSActual energy on each resource element of expression user-specific pilot tone correspondence, E (B) expression only comprise the primary power on each resource element of the data correspondence in the OFDM symbol of public reference signal, ρ _BExpression only comprises the actual energy on each resource element of the data correspondence in the OFDM symbol of public reference signal.

25. base station as claimed in claim 20 is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises:

The EPRE correlation ratio parameter information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises: ρ _D/ P _DRS, E (D)/E (DRS),

26. base station as claimed in claim 17 is characterized in that, describedly further comprises at the exclusive part in sub-district in user's the EPRE relevant information: ρ _C/ ρ _A, E (C)/E (A), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _A, E (B)/E (A), ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _CAnd among E (D)/E (C) one or several,

27. a method that receives data is characterized in that, this method may further comprise the steps:

28. method as claimed in claim 27 is characterized in that, described part at user-specific in user's the EPRE relevant information comprises at least: do not comprise the EPRE relevant information of the data in the OFDM symbol of reference signal, also further comprise:

Only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) and/or the EPRE relevant information of dedicated pilot,

29. method as claimed in claim 28, it is characterized in that described part at user-specific in user's the EPRE relevant information also further comprises: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal and/or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously;

30. method as claimed in claim 28 is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that does not comprise reference signal comprises:

ρ _A/ P _DRSOr E (A)/E (DRS),

31. method as claimed in claim 28 is characterized in that, the data EPRE relevant information in the described OFDM symbol that only comprises DRS (Dedicated Reference Signal) comprises:

ρ _C/P _DRS、E(C)/E(DRS)，

32. method as claimed in claim 29, it is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that only comprises public reference signal, comprise: do not comprise the data EPRE correlation ratio parameter information in the OFDM symbol of reference signal, or at the indication information of the data EPRE in the described OFDM symbol that does not comprise reference signal;

ρ _B/ P _DRSOr E (B)/E (DRS),

33. method as claimed in claim 29 is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises:

34. method as claimed in claim 27 is characterized in that, describedly further comprises at the exclusive part in sub-district in user's the EPRE relevant information: ρ _C/ ρ _A, E (C)/E (A), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _A, E (B)/E (A), ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _CAnd among E (D)/E (C) one or several,

35. a terminal is characterized in that, comprising:

36. terminal as claimed in claim 35 is characterized in that, described part at user-specific in user's the EPRE relevant information comprises at least: do not comprise the EPRE relevant information of the data in the OFDM symbol of reference signal, also further comprise:

Only comprise the data EPRE relevant information in the OFDM symbol of DRS (Dedicated Reference Signal) or the EPRE relevant information of dedicated pilot;

37. terminal as claimed in claim 36, it is characterized in that described part at user-specific in user's the EPRE relevant information also further comprises: only comprise the EPRE relevant information of the data in the OFDM symbol of public reference signal or comprise the EPRE relevant information of the data in the OFDM symbol of dedicated pilot and public guide frequency simultaneously;

38. terminal as claimed in claim 36 is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that does not comprise reference signal comprises:

ρ _A/ P _DRSOr E (A)/E (DRS),

39. terminal as claimed in claim 37 is characterized in that, the data EPRE relevant information in the described OFDM symbol that only comprises DRS (Dedicated Reference Signal) comprises:

ρ _C/ P _DRSOr E (C)/E (DRS),

40. terminal as claimed in claim 37, it is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that only comprises public reference signal, comprise: do not comprise the data EPRE correlation ratio parameter information in the OFDM symbol of reference signal, or at the indication information of the data EPRE in the described OFDM symbol that does not comprise reference signal;

ρ _B/ P _DRSOr E (B)/E (DRS),

41. terminal as claimed in claim 37 is characterized in that, the EPRE relevant information of the data in the described OFDM symbol that comprises dedicated pilot and public guide frequency simultaneously comprises:

42. terminal as claimed in claim 35 is characterized in that, describedly comprises at the exclusive part in sub-district in user's the EPRE relevant information: ρ _C/ ρ _A, E (C)/E (A), ρ _B/ ρ _C, E (B)/E (C), ρ _B/ ρ _A, E (B)/E (A), ρ _D/ ρ _A, E (D)/E (A), ρ _D/ ρ _B, E (D)/E (B), ρ _D/ ρ _CAnd among E (D)/E (C) one or several,