CN103796291A - SRS power control method for auxiliary service district in carrier wave polymerization TDD system - Google Patents

Abstract

The invention provides an SRS power control method for an auxiliary service district in a carrier wave polymerization TDD system. The method comprises steps that: when all the uplink subframes in the auxiliary service district have no corresponding uplink scheduling commands, through a downlink scheduling command for the auxiliary service district, UE schedules an uplink scheduling command of which a CIF (Carrier Indication Field) domain points to the auxiliary service district or acquires an SRS power control command according to certain fields contained in 3/3A in DCI format bounded with the service district, and thereby SRS normal power control is realized.

Description

The SRS Poewr control method of auxiliary serving cell in carrier aggregation TDD system

Technical field

The present invention relates to the power control techniques in communication system, particularly the SRS Poewr control method in auxiliary serving cell in the TDD system of carrier aggregation.

Background technology

Long Term Evolution (LTE) system of 3GPP standardization body is supported Frequency Division Duplexing (FDD) (FDD) and two kinds of duplex modes of time division duplex (TDD).In LTE TDD, the length of each radio frames is 10ms, and it is divided into the field that two length are 5ms.And each field comprises time slot and 3 special domain that 8 length are 0.5ms, these 3 special domain comprise descending pilot frequency time slot (DwPTS), protection interval (GP) and uplink pilot time slot (UpPTS), the length of these 3 special domain be 1ms.In addition, each subframe of LTE tdd frame structure is made up of two continuous time slots, and k subframe comprises time slot 2k and time slot 2k+1.

LTE TDD supports 7 kinds of upstream and downstream configurations, and as shown in table 1, wherein, the D in table 1 represents descending sub frame, and U represents sub-frame of uplink, and S represents the special subframe that comprises above-mentioned 3 special domain.

In LTE-A, obtain larger bandwidth of operation by combining multiple member carriers (CC:Component Carrier), this technology is called carrier aggregation (Carrier Aggregation).For example, in order to support the bandwidth of 100MHz, can obtain by the CC that combines 5 20MHz.Here, each CC is called a Serving cell.Base station can configure a UE and work in multiple Serving cells, and one of them is called main Serving cell (PCell), and other Cell are called auxiliary serving cell (SCell).

In addition, also defined two kinds of scheduling strategies in LTE-A: the first is across carrier dispatching (cross-carrierscheduling), the second right and wrong are across carrier dispatching (non cross-carrier scheduling).Refer to that across carrier dispatching PUSCH transfer of data on a Serving cell is with the uplink scheduling command scheduling sending on another Serving cell, at this moment the community at dispatching command place is called master scheduling Serving cell, and the community at PUSCH place is called the Serving cell that is scheduled; But not refer to that across carrier dispatching PUSCH transfer of data on a Serving cell is with the uplink scheduling command scheduling sending on this Serving cell.Main Serving cell and auxiliary serving cell can be dispatched as master scheduling Serving cell the PUSCH of other Serving cells that are scheduled.

In existing LTE/LTE-A system, SRS(Sounding Reference Signal) transmitting power controlled by eNB, and SRS adopts and PUSCH(Physical Uplink Shared CHannel) identical power control process, eNB notifies UE by broadcast and rrc layer message by static and semi-static SRS power contorl parameters, at each sub-frame of uplink, power control field or DCI form 3/3A(the uplink scheduling order (UL Grant) that UE can receive from PDCCH (PhysicalDownlink Control CHannel) channel by these uplink power control parameters with are before only applicable to the SRS power control in main Serving cell) in the power control field of carrying determine the transmitting power of the SRS in current subframe.

Table 1 uplink-downlink configuration table

For example, for community c, the SRS power on subframe i is by formula is definite below:

$P_{\mathrm{PUSCH},c}\left(i\right)=\min \left\{\begin{array}{c}{P}_{\mathrm{CMAX},c}\left(i\right),\\ P_{\mathrm{SRS}\_\mathrm{OFFSET}}\left(m\right)+10{\log }_{10}\left(M_{\mathrm{SRS},c}\right)+P_{O\_\mathrm{PUSCH},c}\left(j\right)+{\mathrm{\α}}_c\left(j\right)\·{\mathrm{PL}}_c+f_c\left(i\right)\end{array}\right\}\left[\mathrm{dBm}\right]$

Wherein P _{cMAX, c}(i), P _{sRS_OFFSET}, M _sRS,c, P _{o_PUSCH, c}(j), α _cand PL (j) _cconcrete meaning referring to 3GPP agreement 36.213.

F _c(i) be the corrected value of each SRS transmitting power, if the accumulation function (Accumulation) of capability correction value in state of activation, f _c(i)=f _c(i-1)+δ _{pUSCH, c}(i-K _pUSCH); And if the accumulation function of capability correction value is in closed condition, f _c(i)=δ _{pUSCH, c}(i-K _pUSCH); Wherein δ _{pUSCH, c}be called power control commands (TPCcommand), indicated by the power control field of carrying in the power control field in uplink scheduling order or DCI form 3/3A; K _pUSCHfor carrying the uplink scheduling order of power control commands or the interval of the subframe position at DCI form 3/3A place and the subframe position at SRS place, K in TDD system _pUSCHvalue in different uplink-downlink configuration is as shown in table 2.It should be noted that the accumulation function of capability correction value can only be in state of activation in the time carrying out power control by DCI form 3/3A.

Table 2K _pUSCHvalue in different TDD uplink-downlink configuration

And in current research, multiple Serving cells of carrier aggregation can adopt incomplete same TDD upstream and downstream configuration, the in the situation that of some carrier aggregation, all upstream dispatching instructions for the Serving cell sub-frame of uplink that is scheduled all cannot send.And in some cases, in order to simplify system complexity, there is no the PUSCH scheduling timing relation of definition for the Serving cell that is scheduled.Such as, if master scheduling Serving cell is TDD uplink-downlink configuration #0, the Serving cell that is scheduled is TDD uplink-downlink configuration #2, if adopt timing relationship corresponding to TDD uplink-downlink configuration #2 to carry out across carrier wave uplink scheduling, the be scheduled descending sub frame position at the uplink scheduling order place that sub-frame of uplink #2 and sub-frame of uplink #7 are corresponding in Serving cell is respectively subframe #8 and subframe #3, and in master scheduling Serving cell, subframe #8 and subframe #3 are sub-frame of uplink, so all sub-frame of uplink that are scheduled in Serving cell all do not have corresponding uplink scheduling order; If adopt timing relationship corresponding to TDD uplink-downlink configuration #0 to carry out across carrier wave uplink scheduling, although can dispatch all sub-frame of uplink that are scheduled in Serving cell, but can increase like this scheduler complexity of eNB, consider for system simplification, do not support this dispatching across carrier wave PUSCH in Serving cell that be scheduled.

In these cases, because there is no uplink scheduling order, the SRS power control commands being scheduled in Serving cell cannot send, and this will affect the result of the up channel that eNB estimates by SRS.If now Installed System Memory is estimating the demand (in descending employing beamforming transmission pattern) of down channel by TDD channel reciprocity, the downlink data transmission being scheduled in Serving cell also can be affected because SRS cannot realize power control.

For the SRS Power Control Problem in the auxiliary serving cell without up dispatching command, with regard to current achievement in research, also there is no the solution of this respect.

Summary of the invention

The invention provides the SRS Poewr control method in auxiliary serving cell in the TDD system of carrier aggregation, can realize the SRS power control of auxiliary serving cell, no matter whether have the uplink scheduling order of this auxiliary serving cell.

For achieving the above object, the present invention adopts following technical scheme:

A SRS Poewr control method in the TDD system of carrier aggregation in auxiliary serving cell, comprising:

UE receives the descending scheduling order for described auxiliary serving cell on the descending sub frame corresponding with SRS place sub-frame of uplink;

UE determines the power control commands of described SRS according to the DAI field in described descending scheduling order;

UE calculates the transmitted power of SRS according to this power control commands, and sends SRS signal.

Preferably, describedly determine that according to DAI field the power control instruction of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of DAI field are set up to one-to-one relationship;

According to the value of DAI field in described descending scheduling order, determine SRS power control commands.

Preferably, the corresponding relation of the value of described DAI field and SRS power control commands is:

When the accumulation function of SRS power control is during in state of activation, the power control commands value that described DAI field value is 0 corresponding SRS is-1, the power control commands value that described DAI field value is 1 corresponding SRS is 0, the power control commands value that described DAI field value is 2 corresponding SRS is 1, and the power control commands value that described DAI field value is 3 corresponding SRS is 3;

When the accumulation function of SRS power control is during in closed condition, the power control commands value that described DAI field value is 0 corresponding SRS is-4, the power control commands value that described DAI field value is 1 corresponding SRS is-1, the power control commands value that described DAI field value is 2 corresponding SRS is 1, and the power control commands value that described DAI field value is 3 corresponding SRS is 4.

Preferably, the method further comprises: UE receives PDSCH according to the described descending scheduling order detecting in auxiliary serving cell, and determines that the DAI of this PDSCH is 1.

A SRS Poewr control method in the TDD system of carrier aggregation in auxiliary serving cell, comprising:

UE receives the uplink scheduling order of pointing to described auxiliary serving cell for dispatching the PUSCH of master scheduling Serving cell and CIF territory on the descending sub frame corresponding with SRS place sub-frame of uplink;

According to the PUSCH power control field in described uplink scheduling order, determine the power control commands of described SRS;

Calculate the transmitted power of SRS according to this power control commands, and send SRS.

Preferably, describedly determine that according to PUSCH power control field the power control instruction of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of PUSCH power control field are set up to one-to-one relationship;

According to the value of PUSCH power control field in described uplink scheduling order, determine SRS power control commands.

Preferably, the value of described PUSCH power control field and the corresponding relation of SRS power control commands are:

When the accumulation function of SRS power control is during in state of activation, the power control commands value that described PUSCH power control field value is 0 corresponding SRS is-1, the power control commands value that described PUSCH power control field value is 1 corresponding SRS is 0, the power control commands value that described PUSCH power control field value is 2 corresponding SRS is 1, and the power control commands value that described PUSCH power control field value is 3 corresponding SRS is 3;

When the accumulation function of SRS power control is during in closed condition, the power control commands value that described PUSCH power control field value is 0 corresponding SRS is-4, the power control commands value that described PUSCH power control field value is 1 corresponding SRS is-1, the power control commands value that described PUSCH power control field value is 2 corresponding SRS is 1, and the power control commands value that described PUSCH power control field value is 3 corresponding SRS is 4.

Preferably, the method further comprises: UE sends PUSCH in master scheduling Serving cell according to the described uplink scheduling order detecting, and determine that the PUSCH of this master scheduling Serving cell and the power control commands of SRS are 0.

A SRS Poewr control method in the TDD system of carrier aggregation in auxiliary serving cell, comprising:

The uplink scheduling order of described auxiliary serving cell is pointed in PUSCH and CIF territory that UE receives for dispatching master scheduling Serving cell on the descending sub frame corresponding with SRS place sub-frame of uplink, and receives the PDCCH that DCI form is 3/3A;

UE, according to the power control field corresponding with the power control index of this UE in described DCI form 3/3A, determines the power control commands of described SRS;

UE calculates the transmitted power of SRS according to this power control commands, and sends SRS signal.

10, method according to claim 9, is characterized in that, describedly determines that according to described power control field the power control commands of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of DCI form 3 are set up to one-to-one relationship, two kinds of values and the two kinds of SRS power control commands of DCI form 3A are set up to one-to-one relationship;

According to the value of power control field described in described DCI form 3/3A, determine SRS power control commands.

Preferably, the corresponding relation of the value of DCI form 3 and SRS power control commands is:

The power control commands value that described DCI form 3 values are 0 corresponding SRS is-1, the power control commands value that described DCI form 3 values are 1 corresponding SRS is 0, the power control commands value that described DCI form 3 values are 2 corresponding SRS is 1, and the power control commands value that described DCI form 3 values are 3 corresponding SRS is 3;

The value of DCI form 3A and the corresponding relation of SRS power control commands are:

The power control commands value that described DCI form 3A value is 0 corresponding SRS is-1, and the power control commands value that described DCI form 3A value is 1 corresponding SRS is 1.

Preferably, the method further comprises: UE sends PUSCH in master scheduling Serving cell according to the described uplink scheduling order detecting.

A SRS Poewr control method in the TDD system of carrier aggregation in auxiliary serving cell, comprising:

UE obtains its TPC-RNTI and the power control index of UE in corresponding TPC group in auxiliary serving cell;

Described UE receives the PDCCH that is 3/3A by the DCI form of described TPC-RNTI scrambling on the descending sub frame corresponding with SRS place sub-frame of uplink;

UE, according to the power control field corresponding with the described power control index of this UE in described DCI form 3/3A, determines the power control commands of described SRS;

Calculate the transmitted power of SRS according to this power control commands, and send SRS signal.

Preferably, describedly determine that according to described power control field the power control instruction of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of DCI form 3 are set up to one-to-one relationship, two kinds of values and the two kinds of SRS power control commands of DCI form 3A are set up to one-to-one relationship;

According to the value of the described power control field of extracting in described DCI form 3/3A, determine SRS power control commands.

Preferably, the corresponding relation of the value of DCI form 3 and SRS power control commands is:

The power control commands value that described DCI form 3 values are 0 corresponding SRS is-1, the power control commands value that described DCI form 3 values are 1 corresponding SRS is 0, the power control commands value that described DCI form 3 values are 2 corresponding SRS is 1, and the power control commands value that described DCI form 3 values are 3 corresponding SRS is 3;

The value of DCI form 3A and the corresponding relation of SRS power control commands are:

The power control commands value that described DCI form 3A value is 0 corresponding SRS is-1, and the power control commands value that described DCI form 3A value is 1 corresponding SRS is 1.

As seen from the above technical solution, in the present invention, UE can be by the descending scheduling order for this auxiliary serving cell, CIF(Carrier Indication Field) territory points to the uplink scheduling order of this auxiliary serving cell, or be tied to some field of carrying in the DCI form 3/3A of this Serving cell and obtain the power control commands of SRS.

The scheme providing by the application, can change the SRS power control realizing in auxiliary serving cell by very little system.

Accompanying drawing explanation

Fig. 1 is the particular flow sheet of SRS Poewr control method in embodiment mono-;

Fig. 2 is the particular flow sheet of SRS Poewr control method in embodiment bis-;

Fig. 3 is the particular flow sheet of SRS Poewr control method in embodiment tri-;

Fig. 4 is the particular flow sheet of SRS Poewr control method in embodiment tetra-.

Embodiment

For making object of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing, the present invention is described in further details.

According to the explanation in background technology, in the TDD of carrier aggregation system, if the uplink scheduling order corresponding with all sub-frame of uplink in certain auxiliary serving cell all cannot send, in this case, if realize the SRS power control in this auxiliary serving cell, cannot, by the method for existing normalized definition, realize the adjustment of SRS transmitting power according to the power control commands of carrying in uplink scheduling order.

The basic thought that the application addresses the above problem is, if the uplink scheduling order corresponding with all sub-frame of uplink in auxiliary serving cell c all cannot send or be undefined, UE is according to the descending scheduling order for auxiliary serving cell c, or but the PUSCH CIF territory of scheduling homophony community points to the uplink scheduling order of auxiliary serving cell c, or according to the DCI form 3/3A of Serving cell c binding in respective field obtain SRS power control commands.

Particularly, the application provides four kinds of SRS power control commands indicating modes, is specifically introduced below by four embodiment.In ensuing embodiment, the operation result that variable i participates in all needs 10 deliverys to obtain effective value.

Embodiment mono-:

In the present embodiment, UE is according to for the DAI(Downlink Assignment Index in the descending scheduling order without up dispatching command auxiliary serving cell c) power control commands of field acquisition SRS.Due to except TDD uplink-downlink configuration #0 and #6, under other TDD uplink-downlink configuration, DAI field in descending scheduling order has other indicative functions, therefore, for not destroying original indication of DAI field, preferably, the method for the present embodiment is only applicable to the state of carrier aggregation that master scheduling Serving cell is TDD uplink-downlink configuration #0 or #6, as shown in Figure 1, the SRS Poewr control method of embodiment mono-comprises the following steps:

Step 101, UE receives the descending scheduling order for auxiliary serving cell c in the descending sub frame position corresponding with SRS place sub-frame of uplink i.

Here descending scheduling order refers to be used to indicate the DCI form of downlink data transmission.UE mainly according to the CIF territory in descending scheduling order judge current descending scheduling order for community, if the value in this CIF territory is identical with the index of auxiliary serving cell c, think that current descending scheduling order is the descending scheduling order for auxiliary serving cell c.

The descending sub frame position corresponding with sub-frame of uplink i is i-K _pUSCH, wherein K _pUSCHrelevant with TDD uplink-downlink configuration and the i of master scheduling Serving cell, for the different TDD uplink-downlink configuration in master scheduling Serving cell, K _pUSCHvalue when in table 3, TDD uplink-downlink configuration is #0 and #6 as shown in, wherein TDD uplink-downlink configuration is #0 subframe index while being #2 and #7, K _pUSCHcan only be 7.

UE is according to subframe i-K _pUSCHon descending scheduling order receive PDSCH at auxiliary serving cell c, and think that the DAI of this PDSCH is 1, no matter in descending scheduling order, the actual value of DAI field is how many.

K corresponding to different subframes when table 3TDD uplink-downlink configuration #0～#6 _pUSCHvalue

Step 102, UE obtains the power control commands of the SRS on sub-frame of uplink i according to the DAI field in descending scheduling order.

The power control commands δ of SRS on sub-frame of uplink i _{pUSCH, c}by descending sub frame i-K _pUSCHon descending scheduling order in DAI field indication.Whether the corresponding relation between the concrete value of DAI field and the power control commands of SRS can be set up in advance, wherein, activate according to the accumulation function of capability correction value, and the SRS power control commands corresponding to value of DAI field also can be different.In the present embodiment, provide a kind of δ _{pUSCH, c}with the corresponding relation of DAI field, as shown in table 4.Certainly the corresponding relation shown in table 4 is only an example, also can adopt other corresponding relation.

The corresponding relation of table 4 power control commands and DAI field

For example, when master scheduling Serving cell is TDD uplink-downlink configuration #0, and the Serving cell c that is scheduled is while being TDD uplink-downlink configuration #2, be scheduled in Serving cell and have two sub-frame of uplink, be subframe #2 and subframe #7, according to table 3, UE should monitor respectively the descending scheduling order for Serving cell c on subframe #5 and subframe #0.If UE detects the descending scheduling order that CIF territory is identical with the index of auxiliary serving cell c on subframe #5 or subframe #0, UE should receive PDSCH according to this descending scheduling order on auxiliary serving cell c, and thinks that the DAI of this PDSCH is 1.On subframe #2 or subframe #7, the power control commands of SRS can be determined by the value in the DAI territory on subframe #5 and subframe #0 and corresponding relation that table 4 is specified.

Step 103, the power control commands that UE obtains according to step 102 is calculated the transmitted power of SRS, and sends SRS.

The processing of this step is identical with existing SRS Poewr control method, just repeats no more here.

Embodiment bis-:

In the present embodiment, UE basis is used for dispatching the PUSCH of master scheduling Serving cell but the PUSCH power control commands (TPC command for scheduledPUSCH) of the uplink scheduling order of auxiliary serving cell c is pointed in CIF territory, obtain the power control commands of SRS, as shown in Figure 2, comprise the following steps:

Step 201, UE receive in the descending sub frame position corresponding with SRS place sub-frame of uplink i CIF territory point to auxiliary serving cell c, for dispatching the uplink scheduling order of master scheduling Serving cell PUSCH.

The descending sub frame position corresponding with sub-frame of uplink i is i-K _pUSCH, wherein K _pUSCHrelevant with TDD uplink-downlink configuration and the i of master scheduling Serving cell, for the different TDD uplink-downlink configuration in master scheduling Serving cell, K _pUSCHvalue as shown in table 3.

UE is according to i-K _pUSCHthe uplink scheduling order that on position, auxiliary serving cell c is pointed in CIF territory is at master scheduling Serving cell transmission PUSCH, and think in this subframe, in master scheduling Serving cell, the power control commands of PUSCH and SRS is zero, and the actual value of the PUSCH power control commands of no matter carrying in uplink scheduling order is how many.

Step 202, UE obtains the power control commands of the SRS on sub-frame of uplink i according to the PUSCH power control field in uplink scheduling order.

The power control commands δ of SRS on sub-frame of uplink i _{pUSCH, c}by descending sub frame i-K _pUSCHon uplink scheduling order in PUSCH power control field indication.Whether the corresponding relation between the concrete value of PUSCH power control field and the power control commands of SRS can be set up in advance, wherein, activate according to the accumulation function of capability correction value, and the SRS power control commands corresponding to value of PUSCH power control field also can be different.In the present embodiment, provide a kind of δ _{pUSCH, c}as shown in table 4 with the corresponding relation of PUSCH power control field, wherein the value of DAI field should replace with the value of PUSCH power control field.

Step 203, the power control commands that UE obtains according to step 202 is calculated the transmitted power of SRS, and sends SRS.

The processing of this step is identical with existing SRS Poewr control method, just repeats no more here.

Embodiment tri-:

In the present embodiment, UE obtains the power control commands of SRS according to the indication of the DCI form 3/3A in the uplink scheduling order place descending sub frame of CIF territory sensing auxiliary serving cell c.Due in existing protocol, only have main Cell just can send the PDCCH of DCI form 3/3A, therefore, for with existing protocol compatibility, preferably, the method of the present embodiment is applicable to the situation that master scheduling Serving cell is main Cell, and as shown in Figure 3, the SRS Poewr control method in the present embodiment comprises the following steps:

Step 301, UE receives CIF territory and points to the uplink scheduling order of auxiliary serving cell c and the PDCCH that DCI form is 3/3A in the descending sub frame position corresponding with SRS place sub-frame of uplink i.

The descending sub frame position corresponding with sub-frame of uplink i is i-K _pUSCH, wherein K _pUSCHrelevant with TDD uplink-downlink configuration and the i of master scheduling Serving cell, for the different TDD uplink-downlink configuration in master scheduling Serving cell, K _pUSCHvalue as shown in table 3.

UE is according to i-K _pUSCHthe uplink scheduling order that on position, auxiliary serving cell c is pointed in CIF territory is at master scheduling Serving cell transmission PUSCH.

Step 302, UE, according to power control field corresponding with UE power control index in DCI form 3/3A, obtains the power control commands of the SRS on sub-frame of uplink i.

If UE is at descending sub frame i-K _pUSCHon both detected that CIF territory pointed to the uplink scheduling order of auxiliary serving cell c, the PDCCH that DCI form is 3/3A detected again, UE obtains the power control commands δ of the SRS on sub-frame of uplink i according to power control field A corresponding with the power control index (tpc-Index) of this UE in DCI form 3/3A _{pUSCH, c}.Specifically in DCI form 3, in the corresponding relation between the value of power control field and the power control commands of SRS, DCI form 3A, the value of power control field can be set up in advance with the corresponding relation of two kinds of SRS power control commands choosing.In the present embodiment, provide a kind of δ _{pUSCH, c}as shown in secondary series in table 4, wherein the value of DAI field should replace with the value of power control field corresponding with this UE in DCI form 3 with the corresponding relation of power control field in DCI form 3; Provide again a kind of δ _{pUSCH, c}as shown in table 5 with the corresponding relation of power control field in DCI form 3A.

Power control field in DCI form 3A	δ PUSCH,c[dB]
		0	-1
1	1

The corresponding relation of power control field in table 5 power control commands and DCI form 3A

Step 303, the power control commands that UE obtains according to step 302 is calculated the transmitted power of SRS, and sends SRS.

The processing of this step is identical with existing SRS Poewr control method, just repeats no more here.

Embodiment tetra-:

In the present embodiment, UE obtains the power control commands of SRS according to the indication of 3/3A of the TPC-RNTI scrambling in auxiliary serving cell c by it.Due in existing protocol, only have main Cell just can send the PDCCH of DCI form 3/3A, therefore, for with existing protocol compatibility, preferably, the method of the present embodiment is applicable to the situation that master scheduling Serving cell is main Cell, and as shown in Figure 4, the SRS Poewr control method in the present embodiment comprises the following steps:

Step 401, UE receives rrc layer message, obtains its TPC-RNTI in auxiliary serving cell c, and the power control index (TPC-Index) of UE in this TPC group.

This TPC-RNTI is different from UE any other RNTI for scrambling PDCCH in all Serving cells.

Step 402, UE receives in the descending sub frame position corresponding with SRS place sub-frame of uplink i the PDCCH that is 3/3A by the DCI form of the TPC-RNTI scrambling in auxiliary serving cell c.

The descending sub frame position corresponding with sub-frame of uplink i is i-K _pUSCH, wherein K _pUSCHrelevant with TDD uplink-downlink configuration and the i of master scheduling Serving cell, for the different TDD uplink-downlink configuration in master scheduling Serving cell, K _pUSCHvalue as shown in table 3, wherein TDD uplink-downlink configuration is #0 subframe index while being #2 and #7, K _pUSCHcan only be 7.

Step 403, UE, according to power control field corresponding with UE power control index in DCI form 3/3A, obtains the power control commands of the SRS on sub-frame of uplink i.

If UE is at descending sub frame i-K _pUSCHon PDCCH that to detect by the DCI form of the TPC-RNTI scrambling in auxiliary serving cell c be 3/3A, UE obtains the power control commands δ of the SRS on sub-frame of uplink i according to power control field corresponding with the power control index of this UE in DCI form 3/3A _{pUSCH, c}.Specifically in DCI form 3, in the corresponding relation between the value of power control field and the power control commands of SRS, DCI form 3A, the value of power control field can be set up in advance with the corresponding relation of two kinds of SRS power control commands choosing.In the present embodiment, provide a kind of δ _{pUSCH, c}as shown in secondary series in table 4, wherein the value of DAI field should replace with the value of power control field corresponding with this UE in DCI form 3 with the corresponding relation of power control field in DCI form 3; Provide again a kind of δ _{pUSCH, c}as shown in table 5 with the corresponding relation of power control field in DCI form 3A.

Step 404, the power control commands that UE obtains according to step 403 is calculated the transmitted power of SRS, and sends SRS.

The processing of this step is identical with existing SRS Poewr control method, just repeats no more here.

Four kinds of SRS Poewr control methods that provide in the above-mentioned the application of being.The scheme providing by the application, can change the SRS power control realizing in auxiliary serving cell by very little system.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (15)

1. the SRS Poewr control method in auxiliary serving cell in the TDD system of carrier aggregation, is characterized in that, comprising:

UE receives the descending scheduling order for described auxiliary serving cell on the descending sub frame corresponding with SRS place sub-frame of uplink;

UE determines the power control commands of described SRS according to the DAI field in described descending scheduling order;

UE calculates the transmitted power of SRS according to this power control commands, and sends SRS signal.

2. method according to claim 1, is characterized in that, describedly determines that according to DAI field the power control instruction of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of DAI field are set up to one-to-one relationship;

According to the value of DAI field in described descending scheduling order, determine SRS power control commands.

3. method according to claim 2, is characterized in that, the corresponding relation of the value of described DAI field and SRS power control commands is:

When the accumulation function of SRS power control is during in state of activation, the power control commands value that described DAI field value is 0 corresponding SRS is-1, the power control commands value that described DAI field value is 1 corresponding SRS is 0, the power control commands value that described DAI field value is 2 corresponding SRS is 1, and the power control commands value that described DAI field value is 3 corresponding SRS is 3;

When the accumulation function of SRS power control is during in closed condition, the power control commands value that described DAI field value is 0 corresponding SRS is-4, the power control commands value that described DAI field value is 1 corresponding SRS is-1, the power control commands value that described DAI field value is 2 corresponding SRS is 1, and the power control commands value that described DAI field value is 3 corresponding SRS is 4.

4. according to arbitrary described method in claim 1 to 3, it is characterized in that, the method further comprises: UE receives PDSCH according to the described descending scheduling order detecting in auxiliary serving cell, and determines that the DAI of this PDSCH is 1.

5. the SRS Poewr control method in auxiliary serving cell in the TDD system of carrier aggregation, is characterized in that, comprising:

UE receives the uplink scheduling order of pointing to described auxiliary serving cell for dispatching the PUSCH of master scheduling Serving cell and CIF territory on the descending sub frame corresponding with SRS place sub-frame of uplink;

According to the PUSCH power control field in described uplink scheduling order, determine the power control commands of described SRS;

Calculate the transmitted power of SRS according to this power control commands, and send SRS.

6. method according to claim 5, is characterized in that, describedly determines that according to PUSCH power control field the power control instruction of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of PUSCH power control field are set up to one-to-one relationship;

According to the value of PUSCH power control field in described uplink scheduling order, determine SRS power control commands.

7. method according to claim 6, is characterized in that, the value of described PUSCH power control field and the corresponding relation of SRS power control commands are:

When the accumulation function of SRS power control is during in state of activation, the power control commands value that described PUSCH power control field value is 0 corresponding SRS is-1, the power control commands value that described PUSCH power control field value is 1 corresponding SRS is 0, the power control commands value that described PUSCH power control field value is 2 corresponding SRS is 1, and the power control commands value that described PUSCH power control field value is 3 corresponding SRS is 3;

When the accumulation function of SRS power control is during in closed condition, the power control commands value that described PUSCH power control field value is 0 corresponding SRS is-4, the power control commands value that described PUSCH power control field value is 1 corresponding SRS is-1, the power control commands value that described PUSCH power control field value is 2 corresponding SRS is 1, and the power control commands value that described PUSCH power control field value is 3 corresponding SRS is 4.

8. according to arbitrary described method in claim 5 to 7, it is characterized in that, the method further comprises: UE sends PUSCH in master scheduling Serving cell according to the described uplink scheduling order detecting, and determine that the PUSCH of this master scheduling Serving cell and the power control commands of SRS are 0.

9. the SRS Poewr control method in auxiliary serving cell in the TDD system of carrier aggregation, is characterized in that, comprising:

The uplink scheduling order of described auxiliary serving cell is pointed in PUSCH and CIF territory that UE receives for dispatching master scheduling Serving cell on the descending sub frame corresponding with SRS place sub-frame of uplink, and receives the PDCCH that DCI form is 3/3A;

UE, according to the power control field corresponding with the power control index of this UE in described DCI form 3/3A, determines the power control commands of described SRS;

UE calculates the transmitted power of SRS according to this power control commands, and sends SRS signal.

10. method according to claim 9, is characterized in that, describedly determines that according to described power control field the power control commands of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of DCI form 3 are set up to one-to-one relationship, two kinds of values and the two kinds of SRS power control commands of DCI form 3A are set up to one-to-one relationship;

According to the value of power control field described in described DCI form 3/3A, determine SRS power control commands.

11. methods according to claim 10, is characterized in that, the corresponding relation of the value of DCI form 3 and SRS power control commands is:

The power control commands value that described DCI form 3 values are 0 corresponding SRS is-1, the power control commands value that described DCI form 3 values are 1 corresponding SRS is 0, the power control commands value that described DCI form 3 values are 2 corresponding SRS is 1, and the power control commands value that described DCI form 3 values are 3 corresponding SRS is 3;

The value of DCI form 3A and the corresponding relation of SRS power control commands are:

The power control commands value that described DCI form 3A value is 0 corresponding SRS is-1, and the power control commands value that described DCI form 3A value is 1 corresponding SRS is 1.

12. according to arbitrary described method in claim 9 to 11, it is characterized in that, the method further comprises: UE sends PUSCH in master scheduling Serving cell according to the described uplink scheduling order detecting.

SRS Poewr control method in the TDD system of 13. 1 kinds of carrier aggregation in auxiliary serving cell, is characterized in that, comprising:

UE obtains its TPC-RNTI and the power control index of UE in corresponding TPC group in auxiliary serving cell;

Described UE receives the PDCCH that is 3/3A by the DCI form of described TPC-RNTI scrambling on the descending sub frame corresponding with SRS place sub-frame of uplink;

UE, according to the power control field corresponding with the described power control index of this UE in described DCI form 3/3A, determines the power control commands of described SRS;

Calculate the transmitted power of SRS according to this power control commands, and send SRS signal.

14. methods according to claim 13, is characterized in that, describedly determine that according to described power control field the power control instruction of described SRS comprises:

In advance four kinds of values and four kinds of SRS power control commands of DCI form 3 are set up to one-to-one relationship, two kinds of values and the two kinds of SRS power control commands of DCI form 3A are set up to one-to-one relationship;

According to the value of the described power control field of extracting in described DCI form 3/3A, determine SRS power control commands.

15. methods according to claim 14, is characterized in that, the corresponding relation of the value of DCI form 3 and SRS power control commands is:

The power control commands value that described DCI form 3 values are 0 corresponding SRS is-1, the power control commands value that described DCI form 3 values are 1 corresponding SRS is 0, the power control commands value that described DCI form 3 values are 2 corresponding SRS is 1, and the power control commands value that described DCI form 3 values are 3 corresponding SRS is 3;

The value of DCI form 3A and the corresponding relation of SRS power control commands are:

The power control commands value that described DCI form 3A value is 0 corresponding SRS is-1, and the power control commands value that described DCI form 3A value is 1 corresponding SRS is 1.

Images