Trigger method and equipment that SRS signal is sentPresent patent application is to submit Patent Office of the People's Republic of China, Application No. 201010111748.0, invention name on 2 11st, 2010The referred to as divisional application of the Chinese patent application of " SRS signal sending method and its triggering method and equipment ".
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of triggering SRS（Upstream detection pilot frequency signal）LetterNumber send method and equipment.
Background technology
In LTE-A（Long Term Evolution-Advanced）In system, due to Uplink MIMO（Mult-InputMult-Output, multiple-input and multiple-output）Multi-antenna transmission is supported, in order to preferably carry out CQI（Channel QualityIndicator, CQI）Estimation and up precoding selection are, it is necessary to support UE（User Equipment, userEquipment）Can multiple antennas independence carry out upstream detection pilot frequency signal（Sounding Reference Signals, SRS）BiographyIt is defeated.
In REL-8 systems, SRS resource is period assignment, and each UE SRS signal is periodically to send, and it is sent outSend parameter（Such as cycle, subframe, frequency band, frequency hopping configuration）It is high-level signaling RRC（Radio Resource Control, wireless moneySource is controlled）Information configuration, UE is received to be started to send SRS signal after the instruction of base station.SRS signal is not received in UE to closeBefore, UE carries out SRS signal transmission always, therefore SRS signal configuration becomes slowly.
As, to the greater demand of SRS resource, simple being semi-statically configured can not meet demand in lte-a system.Therefore, industry proposes that SRS signal can carry out dynamic configuration, that is, passes through down physical layer control channel PDCCH（Special control letterRoad）Signaling is configured.A kind of typical mode increases by 1 bit triggering SRS signal and sent when being and carrying out uplink scheduling to UE,It can indicate that UE carries out SRS signal transmission with an independently transmitted PDCCH signaling.The former, SRS configuration parameters are that high-level signaling is matched somebody with somebodyPut, PDCCH signalings are to carry out the triggering of SRS transmissions；The latter, SRS configuration parameters are directly set in PDCCH instructions.This twoThe mode of kind is all that independent configuration is carried out to UE.
In view of the realizability and efficiency of system, during the present invention is realized, inventor has found prior art extremelyIt is few that there are the following problems：
On the one hand, the mode that unique user equipment sends SRS signal is triggered using PDCCH signalings, it is larger to overhead,Especially when needing the UE for carrying out SRS transmission triggerings in this way more, descending control PDCCH signalings need very big consumptionTake；
On the other hand, by the way of uplink scheduling signaling carries out SRS triggerings to UE, it can make UE is actual to send SRS signalWhen, its resource distribution is easily produced and collided with each other with other users, that is, allows to collision free, but understand in scheduling byConsiderable restraint.
The content of the invention
Method and equipment that SRS signal is sent are triggered The embodiment provides a kind of, to realize under useRow transmitting and scheduling signaling instruction user equipment sends SRS signal.
The method that triggering SRS signal provided in an embodiment of the present invention is sent, network side in advance matches somebody with somebody detecting pilot frequency signal SRSParameter configuration is put to user equipment, this method includes：
Base station sends downlink transmitting and dispatching signaling to user equipment, wherein carrying for indicating that the user equipment is sentThe configured information of SRS signal.
Detecting pilot frequency signal SRS configuration parameters are configured to user by base station provided in an embodiment of the present invention, network side in advanceEquipment, the base station includes：
Sending module, for sending downlink transmitting and dispatching signaling to user equipment, wherein carrying for indicating the userEquipment sends the configured information of SRS signal.
The above embodiment of the present invention, due to sending SRS signal using downlink transmitting and dispatching signaling instruction user equipment, makesUser equipment can send uplink SRS signal when carrying out downlink transfer, be conducive to preferably supporting wave beam forming, descending non-The transmission means such as code book, because these transmission means need to utilize up-downgoing channel reciprocity, pass through uplink SRS signal base station sideThe uplink channel information of user equipment can be obtained.
Brief description of the drawings
, below will be to the present invention or prior art in order to illustrate more clearly of technical scheme of the invention or of the prior artThe accompanying drawing used required in description is briefly described, it should be apparent that, drawings in the following description are only the present invention'sSome embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to thisA little accompanying drawings obtain other accompanying drawings.
Fig. 1 sends and sent the flow signal of SRS signal for the triggering SRS signal that one embodiment of the invention is providedFigure；
Fig. 2 and Fig. 3 are respectively the configuration for transmitting subframe used in SRS signal under TDD system provided in an embodiment of the present inventionParameter schematic diagram；
The structural representation for the base station equipment that Fig. 4 provides for one embodiment of the invention；
The structural representation for the user equipment that Fig. 5 provides for one embodiment of the invention；
Fig. 6 sends and sent the flow signal of SRS signal for the triggering SRS signal that one embodiment of the invention is providedFigure；
The structural representation for the base station equipment that Fig. 7 provides for one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the present invention, clear, complete description is carried out to the technical scheme in the present invention, is shownSo, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the implementation in the present inventionExample, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made all belongs toIn the scope of protection of the invention.
Embodiment one
The present embodiment is in order to alleviate SRS resource capacity limited situation, and uplink SRS signal, which is sent, can use aperiodic sideFormula, i.e., send a trigger signal by base station and enable UE to carry out SRS signal transmission.Furthermore it is possible to be controlled using sending oneSignaling processed indicates that multiple UE carry out the transmission of SRS signal.
Fig. 1 shows that the flow and user equipment for the base station triggers SRS signal transmission that the present embodiment is provided are triggeredThe flow of SRS signal is sent, wherein, SRS configuration parameters can be by high-level signaling configured in advance to user equipment, and configuration parameter can be withIncluding information such as corresponding signal sequence, band informations.The flow can include：
Step 101, determination need to send the user equipment of SRS signal.
In the step, that or which can be determined by business demand or data-transmission mode of the high level according to each user equipmentA little user equipmenies need to send SRS signal, and determine the mark of these user equipmenies.SRS signal is sent the need for determiningUser equipment can be multiple（Such as one group）.
Step 102, base station send PDCCH signalings, wherein carrying and the mark corresponding to this group of user equipment, the mark pairShould be determined by step 101 one group needs to send the user equipment of SRS signal, and every in user equipment to that should organizeIndividual user equipment, is both provided with a SRS signal and sends sign, and send sign value by different SRS signalsTo indicate whether to require that user equipment sends SRS signal.
Entrained SRS signal sends the mark that sign can be 1 bit length in PDCCH signalings, to reduceThe expense of PDCCH signalings.If using the mark of 1 bit length, can represent to require that user equipment is sent using definition value as 0SRS signal, is worth and represents not requiring that user equipment sends SRS signal for 1, vice versa.
So far, complete and multiple user equipmenies are indicated by a PDCCH signaling（Such as one group of user equipment）Send SRS lettersNumber flow.
It is to use blinded fashion to receive PDCCH signalings in view of user equipment, i.e., user equipment does not know current DCI typically（Downlink Control Information）What is transmitted is what format information, and the information oneself needed is not known yetIn which position.But user equipment knows that oneself is current in what information of expectation, such as may currently expect that SRS sends instructionInformation.For the different corresponding X-RNTI of expectation information user's equipment（Radio network temporary identifier）Go and CCE（Control Channel Element, that is, carry DCI elementary cell）.Information does CRC check, if CRC check success,So user equipment is known that this information is oneself needs, it is also known that corresponding DCIformat, so as to further solveDCI contents.Therefore, in the present embodiment, base station can use SRS-RNTI as No. ID of PDCCH signalings, to indicate one group of useFamily equipment this PDCCH signalings are indicated for user equipment and send SRS, so as to improve blind check of the user equipment to PDCCHEfficiency.Wherein, SRS-RNTI can correspond to one group of user equipment.
Public search space and specific search space can be divided into view of PDCCH space, is set with improving userStandby blind check efficiency.In the present embodiment, base station sends this using public search space is used for instruction user equipment transmission SRS'sPDCCH signalings, so that user equipment detects the PDCCH signalings in public search space, to reduce the complexity of user's blind check.
Further, in order to reduce in blind check number of times, the present embodiment, base station can be according to the length of existing PDCCH signalingsConstructing this is used for the PDCCH signalings that instruction user equipment sends SRS signal.
A kind of typical PDCCH DCI formats example is as follows：
Assuming that the effective information position of the DCI is 20bit, 20 users, the index of 20 users can be supported（User marksKnow）For one in sequence number 1-20, the corresponding information bit of each sequence number can represent the user for 1 or 0,1 and be triggered hairSRS signal is sent, 0 representative does not trigger the user and sends SRS signal.UE, can be first to the DCI information when sending the DCI informationCRC check is carried out, check information and SRS-RNTI carry out XOR and generate new check bit, effective information position and check bit joint groupInto the information bit that the DCI is last, sent carrying out channel coding, data mapping.
The PDCCH signalings that user equipment is sent according to base station, trigger SRS signal transmission flow, including：
Step 103, user equipment monitor PDCCH in predetermined instant, if reading the SRS network marks corresponding to the userKnow symbol, then understand PDCCH signalings.
In the step, the above-mentioned base station of correspondence sends the mode of PDCCH signalings, and user equipment is in blind check PDCCH, publicRegion of search detects whether the PDCCH signalings that signaling ID is SRS-RNTI, if so, then performing step 104.
In the present embodiment, in the user equipment being one group of user equipment that the SRS-RNTI in PDCCH signalings is identifiedOne exemplified by be described.
Step 104, the PDCCH signalings that receive of user equipment parsing, read wherein carry with the customer equipment identificationCorresponding SRS signs.
If step 105, the value of the SRS signs demonstrate the need for user equipment and send SRS signal, step is performed106, otherwise perform step 107.
Step 106, user equipment send SRS signal according to the SRS configuration parameters for being pre-configured with the user equipment.
Step 107, user equipment do not perform SRS signal transmission.
In above-mentioned flow, user equipment can send SRS according to system for the resource that its transmission SRS signal is reserved to be believedNumber.In order to reduce the conflict between resource, base station can be used according to situations such as service conditions and the transmission mode of each userFamily is grouped, and carries out resource allocation, and each user equipment is then notified with high-level signaling, it is preferred that system is the PDCCH signalingsThe resource that one group of indicated user equipment is reserved is mutually orthogonal.
In above-mentioned flow, user equipment can send SRS signal according to sequential as defined in system, and such as user is in n-th of sonFrame is received after the PDCCH, and SRS signal is sent in defined k-th of subframe thereafter.K can provide by agreement, k valuePrinciple is：On the one hand, ensure that user equipment receives, parsed PDCCH time delay, and the SRS signal that processing needs are reported as far as possibleTime delay；On the other hand, because agreement may further specify the transmission position of other information, therefore it should avoid and these as far as possibleInformation sends the conflict of position.
In the specific implementation, for FDD（Frequency division duplex system）User, can carry out the hair of SRS signal in n+4 subframesSend, wherein, n is the subframe for receiving PDCCH signalings；For TDD（Tdd systems）User then needs to carry out in n+k subframeSend, wherein, n is receives the subframe of PDCCH signalings, and configuring k values for different time-gap can be with different.Fig. 2 and Fig. 3 differenceGive in TDD system, the value of the k under different time-gap configuration.
As shown in Fig. 2 for different time slot configurations（TDD UL/DL Configuration in figure）Mode, is connecingThe subframe for receiving PDCCH signalings is DL subframe number n（Descending sub frame number n）When, the value that the numeral in form is k.For example, when TDD UL/DL Configuration are 0, if the subframe for receiving PDCCH signalings is subframe 0, k=4；If the subframe for receiving PDCCH signalings is subframe 1, k=6, k value under other time slot configurations and so on.
In another embodiment of the invention, SRS configuration parameters can also be carried in PDCCH signalings, so, base station is logicalCan also be these user device configurations SRS while crossing PDCCH signaling and trigger multiple user equipmenies and send SRS signalThe transmission parameter of signal, makes these user equipmenies send SRS signal according to the transmission parameter, it is achieved thereby that SRS configuration parametersDynamic configuration.
Based on identical technical concept, the embodiment of the present invention also each provides a kind of base station equipment and a kind of user setsIt is standby.
As shown in figure 4, base station equipment provided in an embodiment of the present invention can include：
Sending module 401, for sending PDCCH signalings, wherein identification information corresponding with multiple user equipmenies is carried, withAnd configured information is sent with the one-to-one SRS of the multiple user equipment, the SRS, which sends configured information, to be used to indicate accordinglyUser equipment whether send SRS signal.
SRS radio network temporary identifiers can be used as the mark corresponding with multiple user equipmenies in sending module 401Information；The PDCCH signalings can also be sent in the public search space of PDCCH channels.
SRS transmitted by sending module 401 sends the sign that configured information is 1 bit.
SRS configuration parameters are also carried in PDCCH signalings transmitted by sending module 401, wherein may include signal sequence, frequencyInformation.
Above-mentioned base station, may also include：
Resource reservation module 402, for being the multiple user before sending module 401 sends the PDCCH signalingsEquipment reserves the resource for sending SRS signal respectively, or will be used to send SRS signal for the multiple user equipment is reserved respectivelyResource be indicated to the multiple user equipment, wherein, be that resource that the multiple user equipment is reserved respectively can be mutualIt is orthogonal.
As shown in figure 5, user equipment provided in an embodiment of the present invention can include：
Receiving module 501, for user equipment with PDCCH signalings described in it is corresponding with multiple user equipmenies markWhen knowing the user equipment corresponding to information, receive in the PDCCH signalings, the PDCCH signalings and include and the user equipment pairThe SRS answered sends configured information.The module is that can search for PDCCH in public search space monitoring PDCCH；
Sending module 502, configured information is sent for the SRS in the PDCCH signalings that receiving module 501 is receivedInstruction user equipment sends SRS signal when sending SRS signal.It is preferred that can be sent out according to the SRS send configurations information being pre-configured withSend SRS signal, it is possible to use the reserved resource of SRS signal is sent by the user equipment and sends SRS signal；
Sending module 502 can send SRS signal in n-th of subframe after receiving the subframe of the PDCCH signalings, itsIn, n is default setting, be can refer to shown in Fig. 2, Fig. 3.
As described above as can be seen that because base station is carried and multiple user equipmenies in the PDCCH signalings of transmissionOne-to-one SRS, which is sent, to be indicated, so as to once indicate that multiple user equipmenies send SRS letters by a PDCCH signalingNumber.Accordingly, the user equipment being instructed to can send according to the SRS wherein carried and indicate after the PDCCH signalings are receivedTrigger the transmission process of SRS signal.As can be seen that above example, which realizes a PDCCH signaling, triggers multiple user equipmeniesSend the effect of SRS signal.
Embodiment two
In the present embodiment, SRS configuration parameters can be configured to user equipment by network side in advance, when network side dispatches certainDuring individual user equipment, it can be sent out by sending downlink transmitting and dispatching signaling to the user equipment with the signaling come instruction user equipmentSend SRS signal.
As shown in fig. 6, the SRS signal transmission flow that the present embodiment is provided can include：
The downlink resource of step 601, base station scheduling user equipment, and send downlink transmitting and dispatching letter to the user equipmentOrder, and send uplink SRS signal using the signaling instruction user equipment.
Step 602, user equipment send SRS after the downlink transmitting and dispatching signaling is received according to the instruction of the signalingSignal.
In above-mentioned flow, base station can be with by way of downlink transmitting and dispatching signaling instruction user equipment sends SRS signalBy the way of dominant instruction, it would however also be possible to employ the mode that recessiveness is indicated.
If by the way of explicit instruction, base station can carry the transmission of instruction user equipment in the downlink transfer signalingThe configured information of SRS signal.Preferably, the configured information can be the sign of 1 bit length, and this is specified to refer to by systemShow the concrete meaning of ident value, e.g., when the sign is 1, expression requires that user equipment sends SRS signal, when the instructionWhen being designated 0, expression does not require that user equipment sends SRS signal., can be in DL grant when implementing（Descending scheduling is believedOrder）It is middle to carry the sign that SRS signal is sent for instruction user equipment.
If by the way of implicit instruction, can in advance be arranged by system, may be taken with downlink transmitting and dispatching signalingThe other information of band, or the combination of other information come indicate whether to need user equipment send SRS signal.For example, using LVRB/DVRB information bit indicates triggering SRS signal, if the information bit indicates that LVRB, triggering SRS send, otherwise do not triggered.
Preferably, to reduce user equipment to the blind check number of times of downlink transmitting and dispatching signaling, the downlink transmitting and dispatching signalingCan be using the form with certain existing PDCCH format length.
Based on identical technical concept, the embodiment of the present invention additionally provides a kind of base station equipment.Network side in advance will detectionPilot signal SRS configuration parameters are configured to user equipment.
As shown in fig. 7, the base station can include：
Sending module 701, for sending downlink transmitting and dispatching signaling to user equipment, wherein carrying for indicating the useFamily equipment sends the configured information of SRS signal.The configured information that sending module 701 is sent is the sign of 1 bit.HairThe configured information for sending module 701 to send can also be LVRB/DVRB information bit, and if the information bit indicates LVRB,Represent that instruction user equipment sends SRS signal.
By above description as can be seen that sending SRS signal by downlink transmitting and dispatching signaling instruction user equipment so thatUser equipment can send uplink SRS signal when carrying out downlink transfer, be conducive to preferably supporting wave beam forming, descending non-codeThe transmission means such as this.Prior art sends SRS signal using uplink scheduling signaling triggering user equipment, and uplink scheduling signaling is notUser can be used for and carry out downlink transfer.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be bySoftware adds the mode of required general hardware platform to realize, naturally it is also possible to which by hardware, but in many cases, the former is moreGood embodiment.Understood based on such, what technical scheme substantially contributed to prior art in other wordsPart can be embodied in the form of software product, and the computer software product is stored in a storage medium, if includingDry instruction is to cause a station terminal equipment（Can be mobile phone, personal computer, server, or network equipment etc.）Perform sheetInvent the method described in each embodiment.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the artFor member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also shouldDepending on protection scope of the present invention.