CN102118842B - Downlink power control method and device applied to long term evolution (LTE) system - Google Patents

Downlink power control method and device applied to long term evolution (LTE) system Download PDF

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CN102118842B
CN102118842B CN 201110066894 CN201110066894A CN102118842B CN 102118842 B CN102118842 B CN 102118842B CN 201110066894 CN201110066894 CN 201110066894 CN 201110066894 A CN201110066894 A CN 201110066894A CN 102118842 B CN102118842 B CN 102118842B
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power
crs
physical
ofdm symbol
sub frame
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CN 201110066894
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CN102118842A (en
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任斌
李琼
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电信科学技术研究院
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Abstract

The invention discloses a downlink power control method and a downlink power control device applied to a long term evolution (LTE) system. The method comprises the following steps of: configuring an absolute power value ECRS_dBm for a resource element (RE) including a cell reference signal (CRS); configuring parameters indicating a transmission power of a same type for all downlink physical channels or downlink physical signals except the CRS according to the ECRS_dBm; and performing power control on the transmission of the downlink physical channels or the downlink physical signals according to the ECRS_dBm and the parameters indicating the transmission power. In the invention, the method for configuring the power value of the all downlink physical channels or the all downlink physical signals in the implementation of an LTE product is provided, so that the correct demodulation of receiving data by user equipment can be guaranteed, and the safety of network-side base station equipment can be guaranteed.

Description

A kind of method for controlling downlink power and device that is applied to the LTE system

Technical field

The present invention relates to wireless communication technology field, relate in particular to method for controlling downlink power and the device of a kind of LTE of being applied to system.

Background technology

Power control is a critical function in cellular mobile communication.Power is controlled and to be made the signal power that receiving terminal receives remain in a suitable scope, has both compensated channel fading, has guaranteed that again transmitted power is unlikely to excessive and has affected user's proper communication, is one of important measures that promote the cellular system performance.LTE(Long Term Evolution, Long Term Evolution) target controlled of system down link power is under the prerequisite that satisfies user's quality of reception, and the transmitting power of reduce down channel reaches the purpose that alleviates presence of intercell interference.

The descending power that defines in the LTE standard distributes decision EPRE(Energy Per Resource Element, the energy of every Resource Unit).The energy definition of Resource Unit is for inserting CP(Cyclic Prefix, Cyclic Prefix) before energy, also represent the average energy on all constellation point under applied modulation system simultaneously.

For downlink power control, at present the LTE normalized definition CRS(Cell-specific Reference Signal, cell reference signals), UE-RS(User Equipment-specific Reference Signal, the UE reference signal), PDSCH(Physical Downlink Shared Channel, Physical Downlink Shared Channel) and PMCH(Physical Multicast Channel, Physical Multicast Channel) parameter that the power division mode that adopts and notice UE use, specific as follows.

1) descending CRS(also claims the residential quarter exclusive reference signal Cell-specific RS) power division

The CRS transmitting power is defined as in the whole system bandwidth, comprises the RE(Resource Element of CRS, Resource Unit) the linear average of gross power.Be that base station broadcast should be the EPRE of CRS to the CRS power of terminal.

The EPRE of CRS is by the RRC(Radio Resource Control of base station, and Radio Resource is controlled) layer parameter-reference signal power Reference-signal-power notification terminal.

Terminal is based on Reference-signal-power value and the RSRP(Reference Signal Receiving Power of base station broadcast, Reference Signal Received Power) measured value calculating path loss.

2) power division of Physical Downlink Shared Channel PDSCH

The upper REs(Resource Elements of PDSCH) EPRE is divided into two classes: type A and type B.Wherein, type A is not for comprising the OFDM(Orthogonal Frequency Division Multiplexing of CRS, OFDM) Resource Unit (REs) of symbol, type B is the Resource Unit (REs) that comprises the OFDM symbol of CRS.

As shown in Figure 1, definition E AEvery Resource Unit ENERGY E PRE of the PDSCH RE of expression type A, unit is W; E BEvery Resource Unit ENERGY E PRE of the PDSCH RE of expression type B, unit is W.In figure, 1 little lattice represents 1 Resource Unit RE, and 1 vertical setting of types represents the resource that the OFDM notation index in 1 time slot takies.

In the UE side, for each UE, do not comprise the EPRE of each PDSCH RE on the OFDM symbol of CRS and the EPRE(E of CRS CRS) more identical than PDSCH-to-RS EPRE, be designated as ρ A:

ρ A = E A E CRS .

In the UE side, for each UE, the EPRE that comprises each PDSCH RE on the OFDM symbol of CRS is identical with the ratio than PDSCH-to-RS EPRE of the EPRE of CRS, is designated as ρ B:

ρ B = E B E CRS .

What UE directly obtained from the network side high level is not to be parameter ρ AAnd ρ B, but P AAnd P B, P wherein BThe cell-level parameter, P AIt is the parameter of UE level.

P AValue by the parameter PDSCH-ConfigDedicated IE of rrc layer notice, be the amount of an enumeration type, it may value be [6 ,-4.77 ,-3 ,-1.77,0,1,2,3].P BPossible span as shown in table 1 below.

Table 1:P BPossible span

UE is obtaining P AAnd P BAfter, determine according to the following rules ρ AAnd ρ B

Under 4 antenna port configurations, if adopt the mode of transmission diversity,

ρ A=δ power-offset+P A+10log 10(2);

In other situation,

ρ A=δ power-offset+P A

ρ AAfter determining, ρ B=P B* ρ A

δ Power-offset7.1.5 joint definition in the TS36.211 agreement, be and MU-MIMO(Multi-user Multi-input Multi-output, multi-user-multiple-input and multiple-output) relevant power excursion, its value is by DCI(Downlink Control Information, Downlink Control Information) the descending power offset domain Downlink Power offset field of 1D determines, and is as shown in table 2:

Table 2: δ Power-offsetValue

3) UE-RS(also claims UE DRS (Dedicated Reference Signal) UE-specific RS) power division

Each in PDSCH subframe (having comprised two slot s lot) comprised on the OFDM symbol of UE-specific RS, and EPRE and the EPRE ratio that comprises the RE of UE-specificRS that does not comprise the PDSCH RE of UE-specific RS is a constant value.For 16QAM(Quadrature Amplitude Modulation quadrature amplitude modulation) and 64QAM for, UE can suppose that this ratio is 0dB.

4) power division of Physical Multicast Channel PMCH

When PMCH uses 16QAM or 64QAM modulation, UE can suppose to comprise the EPRE of the RE of PMCH, with comprise MBSFN(Multimedia Broadcast multicast service Single Frequency Network, multi-medium multi-packet broadcasting broadcast single frequency network network) the EPRE ratio of the RE of RS is 0dB.

do not define PBCH(Physical Broadcast Channel in the LTE standard at present, Physical Broadcast Channel), PCFICH(Physical Control Format Indicator Channel, Physical Control Format Indicator Channel), PDCCH(Physical Downlink Control Channel, Physical Downlink Control Channel), PHICH(Physical HARQ indicator Channel, physical mixed automatic repeat request indicating channel), PSS(Primary Synchronization Signal, master sync signal)/SSS(Secondary Synchronization Signal, auxiliary synchronous signals) power division.Distribute by descending scheduling and resource and can determine the resource that various down physical channels take, as shown in Figure 2, provided the resource schematic diagram that under TD-LTE system convention CP, various down physical channels and downlink physical signal (PBCH and PSS/SSS) take.Fig. 3 a~Fig. 3 c provides the resource schematic diagram that under TD-LTE system convention CP, CRS takies.

For down public common and physical signallings such as PBCH, CRS and PSS/SSS, the processing that power reduces can have influence on residential quarter covering, RSRP/RSRQ(Reference Signal Received Quality, Reference Signal Received Quality) problem such as measurement should not carried out in principle power and be reduced operation; If but do not reduce CRS power, process and only the RE power of data is reduced, will affect demodulation performance because this moment P A, P BNot the value that configures in the RRC signaling, and UE correctly demodulation under the condition of the performance number of the RE that does not obtain correct data.In addition, during greater than the maximum transmit power of equipment, need to carry out the transmitted power protection when the gross power on an OFDM symbol.

It is a Realization of Product problem that the LTE descending power distributes, and does not provide complete definition in the LTE agreement.The high-rise configuration parameter of LTE descending power basic of distribution is controlled at the transmission energy of each Resource Unit part down physical channel and physics reference signal.But there is the problem of two aspects in existing scheme: the 1) power level of how to confirm other downlink physical signal/physics reference signal except the physical channel that has defined power allocation scheme now/physics reference signal, and notice is to physical layer; 2) how how the down transmitting power after the guaranteed output configuration in the scope that system allows, namely during greater than the maximum transmit power of equipment, carries out transmitted power protection when the gross power on an OFDM symbol.

Summary of the invention

The invention provides method for controlling downlink power and the device of a kind of LTE of being applied to system, in order to propose a kind of scheme that the power of all down physical channel/physical signallings is controlled.

The invention provides the method for controlling downlink power of a kind of LTE of being applied to system, comprising:

For comprising the Resource Unit configuration absolute power level E of cell reference signals CRS CRS_dBm

The maximum transmitting power that allows of configuration

According to described E CRS_dBm, to the parameter of all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type;

According to E CRS_dBmAnd the parameter of indication transmitted power, according to the result of descending scheduling and resource distribution, determine the maximum of the transmitted power of each OFDM symbol in descending sub frame

Will With Compare, carry out the transmitted power protection according to comparative result,, wherein, carry out the transmitted power protection according to comparative result, comprising: determine Surpass The time, stop current descending scheduling and resource and distribute; Perhaps, determine Surpass The time, according to With Proportionate relationship,, the transmitted power of all OFDM symbols in descending sub frame is adjusted during at resource mapping in physical layer.

The present invention also provides a kind of LTE of the being applied to downlink power control device of system, comprising:

The first configuration module is used to the Resource Unit configuration absolute power level E that comprises cell reference signals CRS CRS_dBm

The second configuration module is used for according to described E CRS_dBm, to the parameter of all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type;

The 3rd configuration module is used for the maximum transmitting power that allows of configuration

Power control module is used for according to E CRS_dBmAnd the parameter of indication transmitted power, power is carried out in the transmission of down physical channel/downlink physical signal control;

The maximum determination module is used for the result according to descending scheduling and resource distribution, determines the maximum of the transmitted power of each OFDM symbol in descending sub frame

The power protection module is used for when described power control module carries out power control to the transmission of down physical channel/downlink physical signal, will With Compare,, wherein, determine the transmission of down physical channel/downlink physical signal being carried out carry out the transmitted power protection when power is controlled according to comparative result Surpass The time, stop current descending scheduling and resource and distribute; Perhaps, determine Surpass The time, according to With Proportionate relationship,, the transmitted power of all OFDM symbols in descending sub frame is adjusted during at resource mapping in physical layer.

Utilize method for controlling downlink power and the device of the LTE of being applied to provided by the invention system, have following beneficial effect: provided a kind of simple LTE descending power allocation plan, made the power of each down physical channel/physical signalling controlled.

Description of drawings

Fig. 1 is the RE schematic diagram of type A and type B;

Fig. 2 is the resource schematic diagram of PBCH and primary and secondary synchronization signals under TD-LTE system convention CP;

Fig. 3 a is the resource schematic diagram that under 1 antenna port of TD-LTE system, conventional CP, CRS takies;

Fig. 3 b is the resource schematic diagram that under 2 antenna ports of TD-LTE system, conventional CP, CRS takies;

Fig. 3 c is the resource schematic diagram that under 3 antenna ports of TD-LTE system, conventional CP, CRS takies;

Fig. 4 is the method for controlling downlink power flow chart that is applied to the LTE system provided by the invention;

The downlink power control structure drawing of device that Fig. 5 provides for the embodiment of the present invention 1;

The downlink power control structure drawing of device that Fig. 6 provides for the embodiment of the present invention 2.

Embodiment

, illustrate in greater detail method for controlling downlink power and the device that is applied to the LTE system provided by the invention below in conjunction with drawings and Examples.

Problem for the power level of determining other downlink physical signal/physics reference signal except the down physical channel that has defined power allocation scheme now/physics reference signal, the invention provides the method for controlling downlink power of a kind of LTE of being applied to system, as shown in Figure 4, comprising:

Step S401 is for comprising the Resource Unit RE configuration absolute power level E of cell reference signals CRS CRS_ dBm, the unit of absolute power level is dBm, the Resource Unit of the CRS here refers to comprise the resource of CRS, i.e. the Resource Unit that takies of CRS;

Step S402 is according to described E CRS_dBm, to the parameter of all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type, the parameter of the indication transmitted power that all down physical channels except CRS/downlink physical signal configures is of the same type is and E CRS_dBmBe associated, preferably, the parameter of the indication transmitted power that this is of the same type is E CRS_dBmRelative value;

Step S403 is according to E CRS_dBmAnd the parameter of indication transmitted power, power is carried out in the transmission of down physical channel/downlink physical signal control.

In the method for controlling downlink power that is applied to the LTE system of the present embodiment, provided in the LTE Realization of Product, configure the method for all down physical channels/downlink physical signal power value, owing to having provided the power absolute value that adopts CRS, the method of all the other physical channels and physical signalling indicated horsepower parameter of the same type such as relative value configuration, realization is controlled the power of all down physical channels/downlink physical signal, and network side base station rrc layer is with E simultaneously CRS_dBmAnd indicate the parameter of transmitted power to notify to base station MAC layer, and like this, guaranteed the safety of network side base station equipment, can guarantee the correct demodulation of the descending receive data of UE docking simultaneously.

Preferably, the down physical channel of all except CRS specifically comprises PDSCH, PDCCH, PBCH, PSS, SSS, PHICH, PCFICH and PMCH.UE-RS will configure according to the identical EPRE of PDSCH in belonging to same PRB with it, certainly, if existing physical channel or physical signalling are carried out new definition, as increasing or reducing also corresponding adjustment of the scope of above-mentioned all down physical channel/physical signallings.

Parameter to all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type, realize that by unified standard be its allocating power parameter, preferably, every Resource Unit ENERGY E PRE and the E of all down physical channels except CRS of concrete configuration/downlink physical signal in the present embodiment CRS_dBmLinear ratio, owing to being linear ratio, be therefore relative value, there is no unit.Like this, if UE obtains E CRS_dBmThe linear ratio corresponding with each down physical channel/downlink physical signal, just can determine the EPRE of each down physical channel/downlink physical signal, the EPRE of each down physical channel/downlink physical signal refers to every Resource Unit energy in the shared Resource Unit of each down physical channel/downlink physical signal.

According to whether comprising CRS in an orthogonal frequency division multiplex OFDM symbol, carrying out needing differentiated treatment when power is controlled, preferably, in the Resource Unit that each down physical channel/the downlink physical signal takies, for the Resource Unit of the OFDM symbol that does not comprise CRS, and the Resource Unit that comprises the OFDM symbol of CRS configures respectively linear ratio, particularly, for the Resource Unit of the OFDM symbol that does not comprise CRS, configuration the first linear ratio η P*CH_CRS_AFor the Resource Unit of the OFDM symbol that comprises CRS, configuration the second linear ratio η P*CH_CRS_Bη P*CH_CRS_AWith η P*CH_CRS_BValue preferably get different values, η P*CH_CRS_AValue be preferably greater than η P*CH_CRS_BValue.Certainly, both also can get identical value, but will be represented by different parameters.The η of each down physical channel/downlink physical signal P*CH_CRS_AValue can be the same or different, the η of each down physical channel/downlink physical signal P*CH_CRS_BValue can be the same or different, according to actual needs flexible configuration.

The method for controlling downlink power that is applied to the LTE system in the present invention's proposition; guaranteed the correct demodulation of UE to receive data; further; for guaranteed output configures down transmitting power afterwards in the scope that the network side base station system allows; namely when the gross power on an OFDM symbol during greater than the maximum transmit power of base station equipment; how to carry out the transmitted power protection, also comprise in the present embodiment: the maximum transmitting power that allows of configuration Each network equipment has maximum transmission power, configures The maximum transmission power of the actual permission of the equipment that is not more than; Power is carried out in the transmission of down physical channel/downlink physical signal control, specifically comprise: according to the result of descending scheduling and resource distribution, determine the maximum of the transmitted power of each OFDM symbol in descending sub frame Will With Compare, carry out the transmitted power protection according to comparative result.According to the result of descending scheduling and resource distribution, can determine the Resource Unit that each down physical channel/the downlink physical signal takies, according to power configuration before, can determine the maximum of the transmitted power of each OFDM symbol in descending sub frame.Gross power on OFDM symbol should be not more than the maximum transmit power of equipment, and the present embodiment is by finding out the maximum of the transmitted power of OFDM symbol in descending sub frame Realize the purpose of power protection.

Preferably, carry out the transmitted power protection according to comparative result, the present embodiment has provided two kinds of power protection schemes:

1) determine Surpass The time, stop current descending scheduling and resource and distribute.

2) determine Surpass The time, according to With Proportionate relationship,, the transmitted power of all OFDM symbols in descending sub frame is adjusted during at resource mapping in physical layer, thereby the maximum of the transmitted power of OFDM symbol in descending sub frame after adjustment is not more than

As seen; first kind of way is to adopt to stop current scheduling and resource distribution; no longer realize the power protection by current scheduling and allocative decision to the mode that UE sends data; the second way is not stop current descending scheduling and resource distribution; but adjust transmitting power in physical layer; continuation sends data to UE, and the situation that the downlink gross power that two kinds of transmitted power protected modes can be avoided causing due to the power configuration mistake surpasses capacity of equipment occurs.

In the second way, determine With Proportionate relationship be specially and calculate ratio value λ: Transmitted power to all OFDM symbols in descending sub frame is adjusted, and specifically comprises: the transmitted power of all OFDM symbols in descending sub frame be multiply by λ, the maximum of the transmitted power of OFDM symbol in the descending sub frame after adjustment is not more than

In above-mentioned dual mode, all need to calculate the physical channel of all OFDM symbols carry of this subframe/physical signalling power sum, find power on the OFDM symbol maximum and with the maximum transmit power of configuration relatively.

Preferably, determine the maximum of the transmitted power of each OFDM symbol in descending sub frame Specifically comprise:

According to the cyclic prefix CP type of descending sub frame, determine the OFDM symbol numbers that descending sub frame comprises, according to existing LTE agreement, under conventional CP and the OFDM number that comprises in expansion CP descending sub frame determine;

Determine the transmitted power of each OFDM symbol in descending sub frame, and definite maximum Can adopt endless form to calculate successively.

Determine the transmitted power of each OFDM symbol in descending sub frame, the down physical channel that the definite OFDM symbol of needs carries/downlink physical signal, and the down physical channel that the OFDM symbol carries/downlink physical signal is in existing agreement, call number according to subframe numbers and the OFDM of descending sub frame defines.Table 3~table 5 has provided the physical channel of each OFDM symbols carry in TD-LTE system convention CP, descending sub frame.In each table, CRS provides according to 1,2 port arrangement, and 4 port case see also Fig. 3 c.Down physical channel/physical signalling that each OFDM symbol in table 3TD-LTE system convention CP, subframe #0 carries

OFDM notation index number Down physical channel/the physical signalling of carrying 0 CRS、PCFICH、PDCCH、PHICH 1 PDCCH, PHICH(are in the light of actual conditions) 2 PDCCH, PHICH(are in the light of actual conditions) 3 PDSCH 4 CRS、PDSCH 5 PDSCH 6 PDSCH 7 CRS、PBCH、PDSCH 8 PBCH、PDSCH 9 PBCH、PDSCH 10 CRS、PBCH、PDSCH 11 PDSCH 12 PDSCH 13 SSS、PDSCH

In the TD-LTE system, subframe #0 fixed configurations is descending sub frame, wherein:

OFDM symbol #0 carrying CRS, PCFICH, PDCCH, PHICH channel;

OFDM symbol #1 and #2 carrying PDCCH and PHICH channel.

OFDM symbol #3, #5, #6, #11, #12 only carry the PDSCH channel;

OFDM symbol #4 carrying CRS and PDSCH channel;

OFDM symbol #7 and #10 carrying CRS, PBCH and PDSCH channel;

OFDM symbol #8 and #9 carrying PBCH and PDSCH channel;

OFDM symbol #13 carrying SSS and PDSCH channel.

In the TD-LTE system, subframe #5 fixed configurations is descending sub frame.

Physical channel/signal (CRS provides according to 1,2 port arrangement, and 4 port case see also Fig. 3 c) that each OFDM symbol under table 4:TD-LTE system convention CP in subframe #5 carries

OFDM notation index number Down physical channel/the signal of carrying 0 CRS、PCFICH、PDCCH、PHICH 1 PDCCH, PHICH(are in the light of actual conditions) 2 PDCCH, PHICH(are in the light of actual conditions) 3 PDSCH 4 CRS、PDSCH 5 PDSCH 6 PDSCH 7 CRS、PDSCH 8 PDSCH 9 PDSCH 10 CRS、PDSCH 11 PDSCH 12 PDSCH 13 SSS、PDSCH

Under table 5:TD-LTE system convention CP condition, OFDM notation index that in subframe, each physical channel takies number

The present embodiment stipulates based on existing LTE agreement, according to the call number of each OFDM symbol in the subframe numbers of descending sub frame and descending sub frame, determines physical channel/physical signalling that in described descending sub frame, each OFDM symbol carries; According to E CRS_dBmReach the parameter of indication transmitted power, determine the transmitted power sum of all physical channel/physical signallings that each OFDM symbol carries.

The power division of each the down physical channel/physical signalling that proposes based on the present invention is namely according to E CRS_dBmAnd EPRE and the E of each physical channel/physical signalling of carrying of OFDM symbol CRS_dBmLinear ratio, can determine the EPRE of each physical channel/physical signalling that the OFDM symbol carries; Each physical channel that the OFDM symbol carries should comprise a plurality of RE, and the Resource Unit RE number that therefore takies according to each physical channel/physical signalling in the OFDM symbol is determined the gross power on each physical channel/physical signalling in the OFDM symbol; The gross power of each the physical channel/physical signalling in the OFDM symbol is converted to linear value and addition.Being converted to linear value is that unit is mW, and the permission maximum transmission power of above-mentioned setting is also mW, realizes the power ratio of practical significance.

Based on same inventive concept, a kind of LTE of the being applied to downlink power control device of system also is provided in the embodiment of the present invention, because the principle of these device solves problems is similar to a kind of method for controlling downlink power that is applied to the LTE system, therefore the enforcement of these devices can referring to the enforcement of said method, repeat part and repeat no more.

The downlink power control device that is applied to the LTE system provided by the invention as shown in Figure 5, comprising:

The first configuration module 501 is used to the Resource Unit configuration absolute power level E that comprises cell reference signals CRS CRS_dBm

The second configuration module 502 is used for according to described E CRS_dBm, to the parameter of all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type;

Power control module 503 is used for according to E CRS_dBmAnd the parameter of indication transmitted power, power is carried out in the transmission of down physical channel/downlink physical signal control.

Preferably, described the second configuration module 502 specifically is used for, every Resource Unit ENERGY E PRE and the E of configuration all down physical channels/downlink physical signal except CRS CRS_dBmLinear ratio.

Preferably, described the second configuration module 502 specifically is used at each down physical channel/downlink physical signal, for the Resource Unit of the orthogonal frequency division multiplex OFDM symbol that does not comprise CRS, and comprise the Resource Unit of the OFDM symbol of CRS, configure respectively linear ratio.

Preferably, the downlink power control device that is applied to the LTE system also comprises: the 3rd configuration module 504 is used for the maximum transmitting power that allows of configuration

Power control module 503 specifically comprises: maximum determination module 51, be used for the result according to descending scheduling and resource distribution, and determine the maximum of the transmitted power of each OFDM symbol in descending sub frame Power protection module 52, being used for will With Compare, the transmission of down physical channel/downlink physical signal is being carried out carry out the transmitted power protection when power is controlled according to comparative result

Preferably, described power protection module 52 is concrete for determining Surpass The time, stop current descending scheduling and resource and distribute.

Preferably, power protection module 52 is concrete for determining Surpass The time, according to With Proportionate relationship,, the transmitted power of all OFDM symbols in descending sub frame is adjusted during at resource mapping in physical layer.

Preferably, described power protection module 52 specifically comprises: the ratio-dependent module is used for determining ratio value λ: Power regulation module is used for the transmitted power of all OFDM symbols in descending sub frame be multiply by λ.

Preferably, maximum determination module 51 comprises: the symbolic number determination module, be used for the CP type according to descending sub frame, and determine the OFDM symbol numbers that descending sub frame comprises; Maximum screening module, for the transmitted power of determining each OFDM symbol in descending sub frame, and definite maximum

Preferably, maximum determination module 51 specifically comprises: the carrying determination module, be used for the call number according to each OFDM symbol in the subframe numbers of descending sub frame and descending sub frame, determine down physical channel/physical signalling that in described descending sub frame, each OFDM symbol carries; The power summation module is used for according to E CRS_dBmReach the parameter of indication transmitted power, determine the transmitted power sum of all down physical channel/physical signallings that each OFDM symbol carries.

Preferably, the power summation module specifically comprises: RE power determination module is used for according to E CRS_dBmAnd EPRE and the E of each physical channel/physical signalling of carrying of OFDM symbol CRS_dBmLinear ratio, determine the EPRE of each physical channel/physical signalling; Total RE power determination module for the Resource Unit RE number that takies according to each physical channel/physical signalling of OFDM symbol, is determined the gross power on each physical channel/physical signalling in the OFDM symbol; Laminating module is used for the gross power of each physical channel/physical signalling of OFDM symbol is converted to linear value and addition.

Provide the Poewr control method of the LTE of being applied to provided by the invention system and two kinds of preferred embodiments of device below in conjunction with accompanying drawing 5 and accompanying drawing 6.

Embodiment 1

In the present embodiment, the power protection scheme adopts first kind of way, i.e. the power protection scheme of RRC+MAC.As shown in Figure 5, the first configuration module 501, the second configuration module 502 and the 3rd configuration module 504 are positioned at rrc layer; Power control module 503 is positioned at the MAC layer, and MAC also has existing descending scheduling and the resource distribution module that carries out descending scheduling and resource distribution, and is used for the module of assembling MAC packet.

In the present embodiment in the present embodiment Poewr control method comprise following 5 steps, power control module 503 completing steps 2, step 3 and step 4.

Step 1, the initialization operation that rrc layer and MAC layer are correlated with respectively specifically comprises:

Step 1.1, the following parameter of rrc layer initialization:

1) the first configuration module 501 is for comprising the Resource Unit configuration absolute power level E of cell reference signals CRS CRS_dBm, unit is dBm;

2) the second configuration module 502 is according to E CRS_dBm, every Resource Unit ENERGY E PRE and the E of configuration all down physical channels/downlink physical signal (comprising PDSCH, PDCCH, PBCH, PSS, SSS, PHICH and PCFICH) except CRS CRS_dBmLinear ratio η P*CH_CRS

Wherein the second configuration module 502, in each down physical channel/downlink physical signal, for the Resource Unit of the orthogonal frequency division multiplex OFDM symbol that does not comprise CRS, configure η P*CH_CRS_AIn each down physical channel/downlink physical signal, for the Resource Unit of the OFDM symbol that comprises CRS, configuration η P*CH_CRS_B

For example: for the PDSCH that does not comprise CRS and PBCH channel, the linear ratio of corresponding configuration is η PDSCH_CRS_AAnd η PBCH_CRS_AFor the PDSCH that comprises CRS and PBCH channel, the linear ratio of corresponding configuration is η PDSCH_CRS_BAnd η PBCH_CRS_B

3) the 3rd configuration module 504, the maximum of configuration device such as evolution base station eNB allows transmitting power: Unit is mW, for the protection of not surpassing the maximum transmission power that eNB allows.

Step 1.2, the descending scheduling of MAC layer and resource distribution module notify the result of descending scheduling and resource distribution to the downlink power control module, and the descending power module can be determined the subframe numbers of each descending sub frame, the physical channel/physical signalling of each OFDM carrying of descending sub frame and shared Resource Unit thereof like this.

Step 2, in the current descending sub frame of initialization, the maximum of the physical channel that carries on each OFDM symbol/physical signalling EPRE performance number sum OFDM notation index value G with correspondence Index=0; Determine the OFDM symbol numbers MAX_OFDM_SYMBOL_PER_SUBSFRAME that comprises in descending sub frame according to the CP type of descending sub frame: for conventional CP, value 14; For expansion CP, value 12;

Step 3 is carried out following cycle calculations to the OFDM symbol in descending sub frame, obtains OFDM notation index G with correspondence Index:

for?Index_Sym=1:MAX_OFDM_SYMBOL_PER_SUBSFRAME

{

Step 3.1: the EPRE performance number sum of the physical channel/physical signalling that carries on the current OFDM symbol of initialization And obtain the number MAX_CHNANNEL_PER_OFDM_SYMBOL of physical channel/physical signalling that current OFDM symbol comprises;

Step 3.2, each physical channel in this OFDM symbol/physical signalling is calculated the performance number that consumes:

for?Index_Channel=1:MAX_CHNANNEL_PER_OFDM_SYMBOL

{

Step 3.2.1, according to E CRS_dBM and η P*CH_CRSCalculate RE performance number on this physical channel

For example, for the RE of PDSCH channel use in the OFDM symbol that does not comprise CRS, E Index _ Sym , Index _ Channel EPRE = E Index _ Sym , PDSCH _ A EPRE = E CRS _ dBm + 10 log 10 ( η PDSCH _ CRS _ A ) dBm

Wherein, η PDSCH_CRS_ANot comprise the PDSCH channel EPRE of OFDM symbol of CRS and the linear ratio of CRS EPRE;

Step 3.2.2 calculates the gross power of RE on Index_Channel physical channel/physical signalling

E Index _ Sym , Index _ Channel Total _ dBm = E Index _ Sym , Index _ Channel EPRE + 10 log 10 ( N Index _ Channel ) dBm

Wherein, N Index_ChannelIt is the RE number that in current OFDM symbol, this physical channel/physical signalling takies;

Step 3.2.3 is dBm's with the above-mentioned unit of calculating Be converted to linear value

E Index _ Sym , Index _ Channel Total _ linear = 10 E Index _ Sym , Index _ Channel Total _ dBm 10 mW

Step 3.2.4, the linear value addition the power of all channels in each OFDM symbol obtains

E Index _ Sym Total _ linear + = E Index _ Sym , Index _ Channel Total _ linear mW

Wherein, Index_Sym is the call number for the OFDM symbol, N Index_SymBe the physical channel that comprises of this OFDM symbol/physical signalling number, in different descending sub frames, all physical channels of each OFDM symbols carry and physical signalling are as shown in above-mentioned table 3~table 5.

} // step 3.2:for Index_Channel=1:MAX_CHNANNEL_PER_OFDM_SYMBOL

Step3.3 judges whether total transmitted power of current OFDM symbol is maximum, keeps maximum:

} // step 3:for Index_Channel=1:MAX_CHNANNEL_PER_OFDM_SYMBOL

Step 4 is obtained the maximum of the transmitted power of each OFDM symbol in current subframe by step 3 And the call number G of this OFDM symbol Index, and with this power (mW) maximum transmit power that allows with eNB (mW) compare, if The overload of expression current area power is unsuccessfully (FLAG_PT=ERROR) with descending power protective emblem position, otherwise, be successfully (FLAG_PT=SUCCESS) with descending power protective emblem position.Then, notify module and rrc layer to descending scheduling and resource distribution module, assembling MAC packet flag bit FLAG_PT.

Step 5, when FLAG_PT=ERROR, descending scheduling and resource distribution module divide this scheduling result and resource and are configured to invalidly, stop current scheduling and resource and distribute, the operation that do not package of the module of assembling MAC packet; When FLAG_PT=SUCCESS, descending scheduling and resource distribution module judge this scheduling and resource allocation result effective, assemble the module of MAC packet and carry out follow-up normal group package operation.

Embodiment 2

In the present embodiment, the power protection scheme adopts the second way, i.e. RRC+MAC+PL(physical layer, Physical Layer) the power protection scheme.As shown in Figure 6, the first configuration module 501, the second configuration module 502 and the 3rd configuration module 504 are positioned at rrc layer; Ratio-dependent module in power control module 503 in maximum determination module 51 and power protection module 52 is positioned at the MAC layer; power regulation module 522 can be arranged on the downlink resource mapping block that is used for the downlink resource mapping of PL; PL also comprises the downstream transmitter of transmitted signal; MAC also has existing descending scheduling and the resource distribution module that carries out descending scheduling and resource distribution, and is used for the module of assembling MAC packet.

Embodiment 2 comprises 6 steps, and wherein step 1 is identical with embodiment 1 to step 3.

Step 4 is obtained the maximum of the transmitted power of each OFDM symbol in current subframe by step 3 And the call number G of this OFDM symbol Index, and with this power (mW) with eNB product maximum transmit power (mW) compare, if Obtain ratio &lambda; = E MAX _ Power eNB / E MAX Total _ linear ( 0 < &lambda; < 1 ) , Enter step 5; Otherwise, enter step 6;

Step 5, downlink resource mapping block notice λ value to PL, indicating downlink resource mapping module all multiply by coefficient lambda to the transmitted power of all OFDM symbols of current subframe when resource mapping, make the maximum transmit power after adjustment be not more than eNB product maximum transmit power;

Step 6 is normally carried out subsequent operation.

The embodiment of the present invention has provided a kind of simple LTE descending power allocation plan; Down transmitting power after guaranteeing to configure has been guaranteed the safety of base station equipment in the scope that system allows; Can guarantee that the UE side comprises PDSCH, PBCH etc. at the demodulation performance of interior down physical channel and downlink physical signal under the prerequisite that guarantees device security.

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

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

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

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

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

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

Claims (14)

1. a method for controlling downlink power that is applied to the LTE system, is characterized in that, comprising:
For comprising the Resource Unit configuration absolute power level E of cell reference signals CRS CRS_dBm
According to described E CRS_dBm, to the parameter of all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type;
The maximum transmitting power that allows of configuration
According to E CRS_dBmAnd the parameter of indication transmitted power, according to the result of descending scheduling and resource distribution, determine the maximum of the transmitted power of each OFDM symbol in descending sub frame
Will With Compare, carry out the transmitted power protection according to comparative result, wherein, carry out the transmitted power protection according to comparative result, comprising: determine Surpass The time, stop current descending scheduling and resource and distribute; Perhaps, determine Surpass The time, according to With Proportionate relationship,, the transmitted power of all OFDM symbols in descending sub frame is adjusted during at resource mapping in physical layer.
2. the method for claim 1, is characterized in that, the parameter to all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type comprises:
Every Resource Unit ENERGY E PRE and the E of configuration all down physical channels/downlink physical signal except CRS CRS_dBmLinear ratio.
3. method as claimed in claim 2, is characterized in that, EPRE and the E of configuration all down physical channels/downlink physical signal except CRS CRS_dBmLinear ratio, specifically comprise:
In each down physical channel/downlink physical signal, for the Resource Unit of the orthogonal frequency division multiplex OFDM symbol that does not comprise CRS, and the Resource Unit that comprises the OFDM symbol of CRS configures respectively linear ratio.
4. the method for claim 1, is characterized in that, determines With Proportionate relationship be specially and calculate ratio value λ:
&lambda; = E MAX _ Power eNB / E MAX Total _ linear ;
Transmitted power to all OFDM symbols in descending sub frame is adjusted, and specifically comprises:
The transmitted power of all OFDM symbols in descending sub frame be multiply by λ.
5. the method for claim 1, is characterized in that, determines the maximum of the transmitted power of each OFDM symbol in descending sub frame Specifically comprise:
According to the CP type of descending sub frame, determine the OFDM symbol numbers that descending sub frame comprises;
Determine the transmitted power of each OFDM symbol in descending sub frame, and definite maximum
6. the method for claim 1, is characterized in that, determines the transmitted power of each OFDM symbol in descending sub frame, specifically comprises:
According to the call number of each OFDM symbol in the subframe numbers of descending sub frame and descending sub frame, determine physical channel/physical signalling that in described descending sub frame, each OFDM symbol carries;
According to E CRS_dBmReach the parameter of indication transmitted power, determine the transmitted power sum of all physical channel/physical signallings that each OFDM symbol carries.
7. method as claimed in claim 6, is characterized in that, determines the transmitted power sum of all physical channel/physical signallings that each OFDM symbol carries, and specifically comprises:
According to E CRS_dBmAnd EPRE and the E of each physical channel/physical signalling of carrying of OFDM symbol CRS_dBmLinear ratio, determine the EPRE of each physical channel/physical signalling;
According to the Resource Unit RE number that each physical channel/physical signalling in the OFDM symbol takies, determine the gross power on each physical channel/physical signalling in the OFDM symbol;
The gross power of each the physical channel/physical signalling in the OFDM symbol is converted to linear value and addition.
8. a downlink power control device that is applied to the LTE system, is characterized in that, comprising:
The first configuration module is used to the Resource Unit configuration absolute power level E that comprises cell reference signals CRS CRS_dBm
The second configuration module is used for according to described E CRS_dBm, to the parameter of all down physical channels except CRS/downlink physical signal configures indication transmitted power of the same type;
The 3rd configuration module is used for the maximum transmitting power that allows of configuration
Power control module is used for according to E CRS_dBmAnd the parameter of indication transmitted power, power is carried out in the transmission of down physical channel/downlink physical signal control;
The maximum determination module is used for the result according to descending scheduling and resource distribution, determines the maximum of the transmitted power of each OFDM symbol in descending sub frame
The power protection module is used for when described power control module carries out power control to the transmission of down physical channel/downlink physical signal, will With Compare,, wherein, determine the transmission of down physical channel/downlink physical signal being carried out carry out the transmitted power protection when power is controlled according to comparative result Surpass The time, stop current descending scheduling and resource and distribute; Perhaps, determine Surpass The time, according to With Proportionate relationship,, the transmitted power of all OFDM symbols in descending sub frame is adjusted during at resource mapping in physical layer.
9. device as claimed in claim 8, is characterized in that, described the second configuration module specifically is used for, every Resource Unit ENERGY E PRE and the E of configuration all down physical channels/downlink physical signal except CRS CRS_dBmLinear ratio.
10. device as claimed in claim 9, it is characterized in that, described the second configuration module, concrete being used at each down physical channel/downlink physical signal, Resource Unit for the orthogonal frequency division multiplex OFDM symbol that does not comprise CRS, and comprise the Resource Unit of the OFDM symbol of CRS, configure respectively linear ratio.
11. device as claimed in claim 8 is characterized in that, described power protection module specifically comprises:
The ratio-dependent module is used for determining ratio value λ:
Power regulation module is used for the transmitted power of all OFDM symbols in descending sub frame be multiply by λ.
12. device as claimed in claim 8 is characterized in that, the maximum determination module comprises:
The symbolic number determination module is used for the CP type according to descending sub frame, determines the OFDM symbol numbers that descending sub frame comprises;
Maximum screening module, for the transmitted power of determining each OFDM symbol in descending sub frame, and definite maximum
13. device as claimed in claim 8 is characterized in that, the maximum determination module specifically comprises:
The carrying determination module is used for the call number according to each OFDM symbol in the subframe numbers of descending sub frame and descending sub frame, determines physical channel/physical signalling that in described descending sub frame, each OFDM symbol carries;
The power summation module is used for according to E CRS_dBmReach the parameter of indication transmitted power, determine the transmitted power sum of all physical channel/physical signallings that each OFDM symbol carries.
14. device as claimed in claim 13 is characterized in that, the power summation module specifically comprises:
RE power determination module is used for according to E CRS_dBmAnd EPRE and the E of each physical channel/physical signalling of carrying of OFDM symbol CRS_dBmLinear ratio, determine the EPRE of each physical channel/physical signalling;
Total RE power determination module for the Resource Unit RE number that takies according to each physical channel/physical signalling of OFDM symbol, is determined the gross power on each physical channel/physical signalling in the OFDM symbol;
Laminating module is used for the gross power of each physical channel/physical signalling of OFDM symbol is converted to linear value and addition.
CN 201110066894 2011-03-18 2011-03-18 Downlink power control method and device applied to long term evolution (LTE) system CN102118842B (en)

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