Summary of the invention
The novel frame structure of one kind is devised to support to use based on existing LTE frame structure type 2 among the present inventionThe more flexible and reliable channel sense of SRS transmission on the carrier wave that do not permitted, and be able to maintain simultaneously existingThe advantages of LTE tdd frame structure.Therefore, according to it is above-mentioned to background technique and understanding, it is of the inventionFirst aspect propose it is a kind of in the base station of wireless communication system for being configured to realize based on LTE frame structure type 2The method for the uplink frame structures that session is listened to, wherein the first subframe of the uplink frame structures by user for being setThe standby transmission to implement detection reference signal, this method comprises:
(c) whether the last symbol of the type and first subframe that determine first subframe is configured for instituteState the transmission of detection reference signal；And
(d) uplink frame structures are configured according to the result of the determination.
The present inventor innovatively proposes so that the transmission of frame structure type and detection reference signal associates, fromAnd Channel Detection can or be realized by the transmission reserved part resource for detection reference signal or by other means,To provide sound assurance for the transmission of subsequent detection reference signal.Method according to the present invention just can improve detection referenceThe reliability of the transmission of signal listens to regular (Listen-Before-Talk) requirement with session progress row is met.
Among one embodiment according to the present invention, the step (d) further comprises:
(d1) when the last symbol that first subframe is common uplink subframe and first subframeWhen for transmission for the detection reference signal；And
(d2) idle characters or busy symbol are configured by the penultimate symbol of first subframe.
It in this way just can be by the use of the configuration of the penultimate symbol of first subframe and last symbolAssociation is made on way, further detects so as to subsequently provide necessary resource for the transmission of the detection reference signal to improveThe reliability of reference signal transmission.
Among one embodiment according to the present invention, the step (d2) further comprises:
(d21) when the penultimate symbol of first subframe is idle characters that the penultimate symbol is pre-Remain for implementing clear channel assessment (CCA) detection by the user equipment.
As long as making have user equipment that will visit on last symbol in a cell in this wayThe transmission for surveying reference signal, then penultimate symbol is remained for idle letter by the user equipment among all cells in advanceRoad assessment detection, and then provide channel quality relevant information for the transmission of subsequent detection reference signal, whether aid decisionCarry out the transmission of detection reference signal.
Among one embodiment according to the present invention, the step (d2) further comprises:
(d21 ') when the penultimate symbol of first subframe be busy symbol when, then limit cell it is specific onLine link detection reference signal (UDRS) is for assisting the clear channel assessment (CCA) of the detection reference signal to detect.
Those skilled in the art is it is to be appreciated that when completely empty penultimate reserved among first subframeIt also can be to pass through the specific uplink of cell to detect reference signal UDRS's by above-mentioned substitution form of implementation when symbolIt transmits to assist the clear channel assessment (CCA) for the detection reference signal to detect, and then is the biography of subsequent detection reference signalWhether the relevant information of defeated offer channel quality, aid decision carry out the transmission of detection reference signal.
Among one embodiment according to the present invention, the step (d) further comprises:
The symbol that (d1 ') will judge that the domain UpPTS of first subframe includes when first subframe is by special subframeNumber；And
(d2 ') configures the uplink frame structures according to the symbolic number.
Method according to the present invention also innovatively considers special subframe and by the frame structure of the special subframe and the spyThe symbolic number that the domain UpPTS of different subframe is included associates, and then provides for the transmission of subsequent probe reference signal more smartWhether quasi- information, the transmission of detection reference signal is carried out with aid decision.
Among one embodiment according to the present invention, the step (d2 ') further comprises:
When the symbolic number is one, then first subframe is not configured as being implemented to detect by the user equipmentReference signal transmission.
If clear channel assessment (CCA) detection just can not be can be carried out due to only having a symbol among first subframe,The transmission of detection reference signal at this time is not just reliably, therefore among method according to the present invention in this caseFirst subframe is not configured as implementing sounding reference signal transmission enhancement by the user equipment.
Among one embodiment according to the present invention, the step (d2 ') further comprises:
When the symbolic number is two, configure first symbol in the domain UpPTS to by user equipment Lai realClear channel assessment (CCA) is applied to detect and be configured to be implemented to visit by the user equipment by second symbol in the domain UpPTSSurvey reference signal transmission.
When the symbolic number in the domain UpPTS is two, that is to say, that the domain UpPTS is fully able to independently implement idle channelThe transmission of assessment detection and detection reference signal, so method according to the present invention is by first in the domain UpPTS hereinSymbol is configured to implement clear channel assessment (CCA) detection by user equipment and configures second symbol in the domain UpPTSTo implement sounding reference signal transmission enhancement by the user equipment, and then provide for the transmission of subsequent probe reference signal more smartWhether quasi- information, the transmission of detection reference signal is carried out with aid decision.
Among one embodiment according to the present invention, the wireless communication system is long term evolution auxiliary authorization access nothingLine communication system.LTE-LAA system defined herein is only what the method described according to the present invention may be implemented withinOne specific form of implementation of system, those skilled in the art it is to be appreciated that method according to the present invention implement sceneIncluding but not limited to long term evolution auxiliary authorization access to wireless communication system LTE-LAA system.
The second aspect of the present invention propose it is a kind of in the user equipment of wireless communication system for based on LTE frame structureType 2 is configured to realize the method for uplink frame structures that session is listened to, wherein the of the uplink frame structuresOne subframe is used to be implemented by the user equipment transmission of detection reference signal, this method comprises:
(p) user equipment assesses channel quality and implements the detection reference signal according to the assessment resultTransmission.
Method described in second aspect according to the present invention makes the detection reference signal on the frequency range that do not permittedTransmission will necessarily meet and first listen to rear session (LBT) rule, so as to provide different operators and communication equipmentCompossibility reduces mutual interference and at the same time improving the reliability and success rate of communication.
Among one embodiment according to the present invention, the step (p) further comprises:
If the penultimate symbol of first subframe is reserved for implementing clear channel assessment (CCA) detection, describedUser equipment only implements the transmission of the detection reference signal when the result of clear channel assessment (CCA) detection is idle.
Those skilled in the art must be listened to before any transmission it is to be appreciated that under LBT rule,That is, the clear channel assessment (CCA) detection for example implemented among this method, subsequent signal such as detection reference signalTransmission it is inevitable also must be using the result that the clear channel assessment (CCA) of front detects as foundation, i.e., the described user equipment is only in the skyThe result of channel assessment detection implements the transmission of the detection reference signal when being idle.
Among one embodiment according to the present invention, the step (p) further comprises:
When the penultimate symbol of first subframe is not reserved for implementing clear channel assessment (CCA) detection and userEquipment among first subframe have data transmission when, then the user equipment first subframe the last one symbolNumber implement the transmission of the detection reference signal.
It is just able to achieve the transmission of detection reference signal in this way, this is because if having before the user equipmentData transmission then means that the quality of the channel is reliable and the user equipment can be using the channel, this is so-called skyChannel assessment detection be it is extra, in other words, even if also can satisfy and first listen to without clear channel assessment (CCA) detectionThe LBT rule transmitted afterwards, can also guarantee that the transmission of subsequent detection reference signal is reliable.
Among one embodiment according to the present invention, the step (p) further comprises:
When the penultimate symbol of first subframe is not reserved for implementing clear channel assessment (CCA) detection and userWhen equipment does not have data transmission among first subframe, then user equipment blind examination among first subframe is sameThe specific uplink detection reference signal of the cell that other user equipmenies with data transmission of cell are transmitted(UDRS) to determine whether the user equipment implements the detection reference signal in the last symbol of first subframeTransmission.
Here, since penultimate symbol is not reserved for implementing clear channel assessment (CCA) detection and user equipment in instituteIt states among the first subframe and does not have data transmission, this is to carry out independent clear channel assessment (CCA) detection or according to the user equipmentThe transmission of previously performed data come substitute clear channel assessment (CCA) detection be all it is infeasible, at this moment the user equipment will blind examinationThe specific uplink detection reference signal UDRS of cell transmitted by other user equipmenies with cell is to determine other with smallInterference of the user equipment in area for the user equipment itself, and then the subsequent user equipment is in the last of first subframeWhether one symbol implements the transmission of the detection reference signal.
Among one embodiment according to the present invention, specific uplink detection reference signal (UDRS) of cellTransmission only take up the part resource among the third last symbol of first subframe.
The utilization efficiency of sign resources must can be improved in this way, this is because reserving individually second from the bottomA symbol is entirely used for clear channel assessment (CCA) detection but is passed by the part resource among such as third last symbolThe defeated specific uplink of cell detects the mode of reference signal UDRS to realize the evaluation and test of channel quality indirectly, is determined with auxiliaryWhether the subsequent user equipment of plan implements the transmission of the detection reference signal in the last symbol of first subframe.
Among one embodiment according to the present invention, the user equipment will be in the penultimate of first subframeThe energy detected in symbol subtract by the cell specific uplink detection reference signal (UDRS) it is calculated otherThe result that user equipment obtains the interference of the user equipment as the clear channel assessment (CCA) detect as a result, to determineWhether the user equipment implements the transmission of the detection reference signal in the last symbol of first subframe.
Those skilled in the art it is to be appreciated that algorithm presented herein is only exemplary, the present invention include butIt is not limited to method described herein, in contrast, the present invention includes that all detected using the specific uplink of cell is joinedExamine the form of implementation that signal UDRS carrys out the result of computation-free channel estimating detection.
Among one embodiment according to the present invention, the wireless communication system is long term evolution auxiliary authorization access nothingLine communication system.
LTE-LAA system defined herein is only the system that the method described according to the present invention may be implemented withinA specific form of implementation, those skilled in the art is it is to be appreciated that the implement scene of method according to the present invention includesBut it is not limited to long term evolution auxiliary authorization access to wireless communication system LTE-LAA system.
In conclusion the present inventor innovatively proposes so that the transmission of frame structure type and detection reference signal is closedConnection gets up, so as to or by for detection reference signal transmission reserved part resource or by other means realizeChannel Detection, so that the transmission for subsequent detection reference signal provides sound assurance.Method according to the present invention just can mentionThe reliability of the transmission of high detection reference signal listens to regular (Listen-Before-Talk) requirement with session progress row is met.
Specific embodiment
In the following detailed description of the preferred embodiment, reference is constituted to the appended attached drawing of present invention a part.InstituteAttached attached drawing, which has been illustrated by way of example, can be realized specific embodiment.Exemplary embodiment is not intended toExhaustive all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, can use otherEmbodiment can also carry out the modification of structure or logic.Therefore, it is below specific descriptions and it is unrestricted, and thisThe range of invention is defined by the claims appended hereto.
The first aspect of the present invention propose it is a kind of in the base station of wireless communication system for based on LTE frame structure type2 method to be configured to the uplink frame structures for realizing that session is listened to, Fig. 1 show the process of method according to the present inventionFigure 100.Wherein, the first subframe of uplink frame structures is used to be implemented by user equipment the transmission of detection reference signal, shouldMethod 100 includes:
Firstly, among method and step 110, it will determine the type of the first subframe and the last symbol of the first subframeWhether the transmission of detection reference signal is configured for；And
Next, among method and step 120, it will according to determining result come collocating uplink Link Frame Structure.
The present inventor innovatively proposes so that the transmission of frame structure type and detection reference signal associates, fromAnd Channel Detection can or be realized by the transmission reserved part resource for detection reference signal or by other means,To provide sound assurance for the transmission of subsequent detection reference signal.Method according to the present invention just can improve detection referenceThe reliability of the transmission of signal listens to regular (Listen-Before-Talk) requirement with session progress row is met.
Among one embodiment according to the present invention, step 120 further comprises:
Step 121 (not shown): when the first subframe is the last of common uplink subframe and the first subframeWhen one symbol is the transmission for detection reference signal；And step 122 (not shown): by reciprocal the of the first subframeTwo symbols are configured to idle characters or busy symbol.
It in this way just can be by the use of the configuration of the penultimate symbol of first subframe and last symbolAssociation is made on way, further detects so as to subsequently provide necessary resource for the transmission of the detection reference signal to improveThe reliability of reference signal transmission.
Among one embodiment according to the present invention, step 122 further comprises:
Step 1221 (not shown): when the penultimate symbol of the first subframe is empty by penultimate symbolRemain for implementing clear channel assessment (CCA) detection by user equipment in advance.
As long as making have user equipment that will visit on last symbol in a cell in this wayThe transmission for surveying reference signal, then penultimate symbol is remained for idle letter by the user equipment among all cells in advanceRoad assessment detection, and then provide channel quality relevant information for the transmission of subsequent detection reference signal, whether aid decisionCarry out the transmission of detection reference signal.
Among one embodiment according to the present invention, step 122 further comprises:
Step 1221 ' (not shown): when the penultimate symbol of the first subframe is non-empty, then cell spy is limitedFixed uplink detection reference signal (UDRS) is to assist the clear channel assessment (CCA) for detection reference signal to detect.
Those skilled in the art is it is to be appreciated that when completely empty penultimate reserved among first subframeIt also can be to pass through the specific uplink of cell to detect reference signal UDRS's by above-mentioned substitution form of implementation when symbolIt transmits to assist the clear channel assessment (CCA) for detection reference signal to detect, and then is mentioned for the transmission of subsequent detection reference signalFor the relevant information of channel quality, whether aid decision carries out the transmission of detection reference signal.
Among one embodiment according to the present invention, step 120 further comprises:
Step 121 ' (not shown): the domain the UpPTS institute when the first subframe will to judge the first subframe when special subframeThe symbolic number for including；And
Step 122 ' (not shown): carry out collocating uplink Link Frame Structure according to symbolic number.
Method according to the present invention also innovatively considers special subframe and by the frame structure of the special subframe and the spyThe symbolic number that the domain UpPTS of different subframe is included associates, and then provides for the transmission of subsequent probe reference signal more smartWhether quasi- information, the transmission of detection reference signal is carried out with aid decision.
Among one embodiment according to the present invention, step 122 ' further comprise:
When symbolic number is one, then the first subframe is not configured as implementing detection reference signal biography by user equipmentIt is defeated.
If clear channel assessment (CCA) detection just can not be can be carried out due to only having a symbol among first subframe,The transmission of detection reference signal at this time is not just reliably, therefore among method according to the present invention in this caseFirst subframe is not configured as implementing sounding reference signal transmission enhancement by user equipment.
Among one embodiment according to the present invention, step 122 ' further comprise:
When symbolic number is two, it is configured to first symbol in the domain UpPTS to implement idle letter by user equipmentRoad assessment detects and is configured to second symbol in the domain UpPTS to implement sounding reference signal transmission enhancement by user equipment.
When the symbolic number in the domain UpPTS is two, that is to say, that the domain UpPTS is fully able to independently implement idle channelThe transmission of assessment detection and detection reference signal, so method according to the present invention is by first symbol in the domain UpPTS hereinIt is configured to implement clear channel assessment (CCA) detection by user equipment and configures second symbol in the domain UpPTS to by userEquipment implements sounding reference signal transmission enhancement, and then provides more accurately information for the transmission of subsequent probe reference signal, withWhether aid decision carries out the transmission of detection reference signal.
Among one embodiment according to the present invention, wireless communication system is long term evolution auxiliary authorization access channel radioLetter system.LTE-LAA system defined herein is only the one of the system that method according to the present invention may be implemented withinA specific form of implementation, those skilled in the art is it is to be appreciated that the implement scene of method according to the present invention includes but notIt is limited to long term evolution auxiliary authorization access to wireless communication system LTE-LAA system.
The second aspect of the present invention propose it is a kind of in the user equipment of wireless communication system for based on LTE frame structureType 2 is come the method for being configured to the uplink frame structures for realizing that session is listened to, and Fig. 2 shows methods according to the present inventionFlow chart 200.Wherein, the first subframe of uplink frame structures is used to be implemented by user equipment the biography of detection reference signalDefeated, this method 200 includes:
Method and step 210: user equipment assesses channel quality and implements detection reference signal according to assessment resultTransmission.
The method of second aspect according to the present invention makes the biography of the detection reference signal on the frequency range that do not permittedIt is defeated will necessarily meet first listen to rear session (LBT) rule, so as to provide coexisting for different operators and communication equipmentProperty, reduce mutual interference and at the same time improving the reliability and success rate of communication.
Among one embodiment according to the present invention, step 210 further comprises:
If the penultimate symbol of the first subframe is reserved for implementing clear channel assessment (CCA) detection, user equipmentOnly implement the transmission of detection reference signal when the result of clear channel assessment (CCA) detection is idle.
Those skilled in the art must be listened to before any transmission it is to be appreciated that under LBT rule,That is, the clear channel assessment (CCA) detection for example implemented among this method, subsequent signal such as detection reference signalTransmission it is inevitable also must be using the result that the clear channel assessment (CCA) of front detects as foundation, i.e., user equipment is only commented in idle channelEstimate the transmission for implementing detection reference signal when the result of detection is idle.
Among one embodiment according to the present invention, step 210 further comprises:
When the penultimate symbol of the first subframe is not reserved for implementing clear channel assessment (CCA) detection and user equipmentWhen having data transmission among the first subframe, then user equipment implements detection with reference to letter in the last symbol of the first subframeNumber transmission.
It is just able to achieve the transmission of detection reference signal in this way, this is because if having before the user equipmentData transmission then means that the quality of the channel is reliable and the user equipment can be using the channel, this is so-called skyChannel assessment detection be it is extra, in other words, even if also can satisfy and first listen to without clear channel assessment (CCA) detectionThe LBT rule transmitted afterwards, can also guarantee that the transmission of subsequent detection reference signal is reliable.
Among one embodiment according to the present invention, step 210 further comprises:
When the penultimate symbol of the first subframe is not reserved for implementing clear channel assessment (CCA) detection and user equipmentAmong the first subframe do not have data transmission when, then user equipment among the first subframe blind examination with cell other have numberSpecific uplink detection reference signal (UDRS) of the cell transmitted according to the user equipment of transmission is to determine that user equipment existsWhether the last symbol of the first subframe implements the transmission of detection reference signal.
Here, since penultimate symbol is not reserved for implementing clear channel assessment (CCA) detection and user equipment theDo not have data among one subframe to transmit, this is to carry out independent clear channel assessment (CCA) detection or previous according to the user equipmentCarried out data transmission come substitute clear channel assessment (CCA) detection be all it is infeasible, at this moment the user equipment will collect otherThe specific uplink of cell transmitted by user equipment with cell detection reference signal UDRS and it is carried out blind examination withDetermine other interference for the user equipment itself of user equipment with cell, and then subsequent user equipment is in the first subframeWhether last symbol implements the transmission of detection reference signal.
Among one embodiment according to the present invention, the biography of specific uplink detection reference signal (UDRS) of cellPart resource among the defeated third last symbol for only taking up the first subframe.
The utilization efficiency of sign resources must can be improved in this way, this is because reserving individually second from the bottomA symbol is entirely used for clear channel assessment (CCA) detection but is passed by the part resource among such as third last symbolThe defeated specific uplink of cell detects the mode of reference signal UDRS to realize the evaluation and test of channel quality indirectly, is determined with auxiliaryWhether plan subsequent user equipment implements the transmission of detection reference signal in the last symbol of the first subframe.
Among one embodiment according to the present invention, user equipment will be examined in the penultimate symbol of the first subframeThe energy measured subtract by cell specific uplink detection reference signal (UDRS) calculated other users equipment toThe interference of family equipment and the result that obtains as clear channel assessment (CCA) detect as a result, to determine user equipment in the first subframeWhether last symbol implements the transmission of detection reference signal.
Those skilled in the art it is to be appreciated that algorithm presented herein is only exemplary, the present invention include butIt is not limited to method described herein, in contrast, the present invention includes that all detected using the specific uplink of cell is joinedExamine the form of implementation that signal UDRS carrys out the result of computation-free channel estimating detection.
Among one embodiment according to the present invention, wireless communication system is long term evolution auxiliary authorization access channel radioLetter system.
LTE-LAA system defined herein is only the one of the system that method according to the present invention may be implemented withinA specific form of implementation, those skilled in the art is it is to be appreciated that the implement scene of method according to the present invention includes but notIt is limited to long term evolution auxiliary authorization access to wireless communication system LTE-LAA system.
The frame structure signal that the method described according to the present invention below with reference to specific frame structure schematic diagram is realizedFigure.Fig. 3 shows a kind of possible form of implementation 300 of uplink frame structures according to the present invention.From figure 3, it can be seen thatAmong uplink subframe 300, last symbol is used for sounding reference signal transmission enhancement, and penultimate symbol is for idle letterRoad assessment detection, and remaining N-2 symbol is physical uplink shared channel, wherein N for uplink subframe itIncluded in symbolic number.
Fig. 4 shows a kind of possible form of implementation 400 of uplink frame structures according to the present invention.It can from Fig. 4Out, among uplink subframe 400, last symbol is used for sounding reference signal transmission enhancement, and penultimate symbol is notRemain for clear channel assessment (CCA) detection in advance, but the user equipment has data transmission on symbol before, so the useFamily equipment can directly carry out the transmission of detection reference signal on last symbol, and remaining N-1 symbol is objectManage uplink shared channel, wherein N is symbolic number included in a uplink subframe.It can be seen from the figure thatReference signal is detected with uplink among third last symbol and only takes up the resource of its part, the skill of this fieldArt personnel are it is to be appreciated that it is not restrictive, and only example that UDRS signal, which is arranged among third last symbol,Property, that is to say, that the uplink detection reference signal among the present invention can also be transmitted among other symbols.
Fig. 5 shows a kind of possible form of implementation 500 of uplink frame structures according to the present invention.It can from Fig. 5Out, among uplink subframe 500, last symbol is used for sounding reference signal transmission enhancement, and penultimate symbol is notRemain for clear channel assessment (CCA) detection in advance, but the user equipment does not have data on symbol before and transmits, so shouldUser equipment needs to detect other and carries out blind examination with the UDRS signal of the user equipment of cell and to it to obtain other usersThen interference of the equipment for the user equipment itself carries out clear channel assessment (CCA) detection, most among penultimate symbolThe idle channel that other users equipment carries out the interference of the user equipment itself on penultimate symbol is commented afterwardsEstimate and subtracts new result to detect as clear channel assessment (CCA) among the result of detection to judge channel quality, to determine mostWhether the transmission of detection reference signal is carried out on the latter symbol, and remaining N-1 symbol is physical uplink link sharingChannel, wherein N is symbolic number included in a uplink subframe.It can be seen from the figure that being accorded in third lastReference signal is detected with uplink among number and only takes up the resource of its part, and those skilled in the art shouldSolution, it is restrictive that UDRS signal, which is arranged among third last symbol not, and is only exemplary, that is to say, thatUplink detection reference signal among the present invention can also be transmitted among other symbols.
Fig. 6 shows a kind of possible form of implementation 600 of uplink frame structures according to the present invention.It can from Fig. 6Out, which is special subframe, and among special subframe 600, last symbol is passed for detection reference signalDefeated, penultimate symbol is detected for clear channel assessment (CCA), the two symbols have collectively constituted the UpPTS of the special subframeDomain, in other situations, i.e., in the case that the domain UpPTS of special subframe only includes a symbol, such special sonFrame will be not used for transmitting detection reference signal.
In conclusion the present inventor innovatively proposes so that the transmission of frame structure type and detection reference signal is closedConnection gets up, so as to or by for detection reference signal transmission reserved part resource or by other means realizeChannel Detection, so that the transmission for subsequent detection reference signal provides sound assurance, method so according to the present invention is justThe reliability of the transmission of detection reference signal can be improved, and then improves the performance of entire wireless communication system.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er QieIn the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matterHow from the point of view of, the present embodiments are to be considered as illustrative and not restrictive.In addition, it will be evident that " including " word is notOther elements and steps are excluded, and wording " one " is not excluded for plural number.The multiple element stated in device claim can alsoTo be implemented by one element.The first, the second equal words are used to indicate names, and are not indicated any particular order.