CN104780559A - Method and device for quickly receiving and sending downlink data and uplink data - Google Patents
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- H—ELECTRICITY
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- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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Abstract
The invention discloses a method for quickly receiving and sending downlink data and uplink data. The method comprises the following steps: UE processing downlink synchronization according to DiS, or DiS and a CRS after a cell X is opened; the UE measuring RSRP/RSRQ and/or CSI information of the cell X based on DiS, and reporting to a service cell currently in work; the UE receiving PDCCH and PDSCH on the cell X, detecting trigger information in a random access process on the cell X, and executing the random access process; the UE measuring and reporting the CSI information. Through the adoption of the method and device disclosed by the invention, the uplink synchronization process of the UE can be accelerated, the UE measurement process and the CSI feedback process are accelerated, required conversion time from the condition that the cell is opened to the condition that the cell is capable of really receiving and sending the uplink data and the downlink data is reduced, thereby effectively supporting the ON/OFF operation of the cell, and improving the system performance.
Description
Technical field
The present invention relates to wireless communication system, relate in particular and a kind ofly open a Serving cell fast and receive and dispatch the method and apparatus of downlink data and upstream data.
Background technology
In 3GPP LTE system, the length of each radio frames is 10ms, is divided into 10 subframes.A downlink times interval (TTI) is exactly be defined in a subframe.A subframe structure schematic diagram as shown in Figure 1.Each descending sub frame comprises two time slots, and to general Cyclic Prefix (CP) length, each time slot comprises 7 OFDM symbol; To expansion CP length, each time slot comprises 6 OFDM symbol.Resource allocation granularity in subframe is Physical Resource Block PRB.A PRB comprises 12 continuous print subcarriers in frequency, in time a corresponding time slot.Two PRB in two time slots in a subframe in same sub-carrier are called a PRB couple.At each PRB to interior, each Resource Unit (RE) is the least unit of running time-frequency resource, namely frequency is a subcarrier, the time is an OFDM symbol.RE can be respectively used to different functions, and such as, a part of RE can be respectively used to transmission cell specific reference signal (CRS), the specific demodulated reference signal of user (DMRS), channel quality instruction reference signal (CSI-RS) etc.
Front n OFDM symbol of each descending sub frame may be used for transmitting Downlink Control Information, and comprise Physical Downlink Control Channel (PDCCH) and other control informations, n equals 0,1,2,3 or 4; Remaining OFDM symbol can be used for transmitting PDSCH or strengthening PDCCH(EPDCCH).In LTE system, PDCCH is the Downlink Control Information (DCI) that carrying distributes uplink channel resources or down channel resources, is called downstream grants signaling and uplink authorization signaling.The authorization signaling of different UE independently sends.Downstream grants signaling and uplink authorization signaling independently send.
In LTE system, be based on hybrid automatic repeat-request (HARQ) machine-processed transmitting downlink data.In order to support channel self-adapting thus optimize downlink transfer performance, UE needs feedback current channel condition information (CSI) at up direction.CSI can divide into channel sequence instruction (RI), encoder matrix instruction (PMI) and channel quality instruction (CQI) etc. further.According to defining multiple downlink transfer pattern in LTE system.Such as, to down direction, comprise closed loop multiple-input, multiple-output (MIMO) transmission mode, open-loop MIMO mode, transmit diversity transmission mode etc.Corresponding different transmission modes, the form of its CSI feedback is also different.
In order to improve hardware circuit solution further, LTE system supports carrier aggregation (CA).Specifically, network can be that a UE configures multiple carrier wave, and one of them is main Serving cell (Pcell), other be time Serving cell (Scell).The initial state of the Scell of a configuration is unactivated.Network can when sending downlink data, and the indication information controlled with medium access in the control unit (CE) of (MAC) activates or deexcitation Scell.Suppose that UE activates the Scell of a configuration at subframe n by MAC CE, then UE could carry out general downstream transmission at this Scell from subframe n+8, comprises SRS transmission, CSI feedback, the PDCCH etc. that detects PDCCH and detect on homophony community this Scell on this Scell.Briefly, after UE receives the MAC CE activating Scell, the time of 8ms is had at least actual not work on Scell.
To CSI(A-CSI aperiodic) report, the fastest situation can only be that UE receives the uplink scheduling signaling (UL Grant) triggering A-CSI at subframe n+8, then A-CSI information is fed back at n+8+k, k is more than or equal to 4, after certain processing delay, the information that base station could really utilize A-CSI to report is to carry out downlink data transmission.To uplink, if Scell is up be in desynchronizing state, then UE can detect at subframe n+8 the instruction (PDCCH order) triggering Scell random access procedure the earliest; Then, UE could send arbitrary access front signal (Preamble) at subframe n+8+k2, and k2 is more than or equal to 6; Then, UE could obtain uplink synchronous after receiving Stochastic accessing response message (RAR), thus carries out uplink.
In the further evolution version of LTE system, a kind of important technology point is the further enhancing to small-cell.Specifically, 3 kinds of scenes can be comprised.The first scene is the situation that macrocell and small-cell are deployed in same frequency, and wherein, macrocell provides covering, and completes focus enhancing by dense deployment small-cell, and here, small-cell can be divided into one or more cell cluster.The second scene is the situation that macrocell and small-cell are deployed in different frequency, and similar, macrocell provides covering, and completes focus enhancing by dense deployment small-cell, and here, small-cell can be divided into one or more cell cluster.Here, cluster small-cell can be deployed in same storied building room.The third scene is the situation of only disposing small-cell, and small-cell can be divided into one or more cell cluster, dense deployment small-cell in each bunch, and cluster small-cell can be deployed in same storied building room.In these three kinds of scenes, common problem is that it disturbs very large mutually, also has the interference from macrocell, so the interference problem how processed in the scene of above-mentioned small-cell is the problem that will solve to the first scene because the ratio comparatively dense disposed of small-cell.
According to the discussion in current RAN1, a kind of up-and-coming technology only waits when needed just to open a small-cell, and close those unwanted small-cells, thus reduce the interference level of whole network thus the user throughput of raising system.Following this technology is called small-cell ON/OFF.This is because in existing LTE system, even if any UE is not served in a small-cell, this small-cell still needs to send CRS, and CRS needs with higher power emission, thus has caused to other active services the interference of the small-cell of UE.More intuitively, by the small-cell of these current not service UE is closed, thus do not send CRS, reduced to adjacent active service the interference of the small-cell of UE, the systematic function of raising.Unwanted small-cell is closed, also reduces the energy loss of base station equipment.But the closedown of small-cell and open and need the time, if these processing delay are too large, this small-cell ON/OFF technology may, without any benefit, even cause systematic function to decline.
In order to effectively support that small-cell ON/OFF operates, the closedown reducing small-cell and the impact of change-over time of opening, in current RAN1 discusses, introduce and find reference signal (Discovery Signal, DiS).As shown in Figure 2, under power saving prerequisite, to small-cell when being in OFF, still its channel status can be measured, such as Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ), thus network according to the service distribution of UE and channel status, can be selected optimum small-cell, and utilizes this small-cell to carry out the up-downgoing transfer of data of service UE rapidly.In addition after cell switch is the state of ON, still likely continue to send DiS.In order to avoid the larger time delay caused because of switching cell, in current RAN1 discusses, can utilize CA technology or dual link (Dual Connectivity) technology, namely UE remains on the upper connection of setting up in a community (being generally macrocell), thus avoids switching flow; Meanwhile, utilize CA or dual link technology, utilize another community to realize transmission to strengthen downstream transmission, because do not need to switch, the change-over time that UE needs is shorter.As shown in Figure 3, for CA, when small-cell is in OFF state, UE still can carry out the relevant measurement of RRM (RRM) based on DiS, and report its another community (such as, macrocell) connected, according to practical business and channel status, small-cell can be converted to ON state by macrocell, and send Scell activate be indicated to UE(and be designated as subframe n).Like this, small-cell is converted to ON state, and UE can detect the PDCCH of small-cell at subframe n+8 and report CSI information.
The above-mentioned DiS technology of reasonable application and CA or dual link technology, the closedown reducing small-cell further and the impact of change-over time of opening, thus optimize the performance of small-cell ON/OFF, be the problem to be solved in the present invention.
Summary of the invention
This application discloses and a kind ofly open a Serving cell fast and receive and dispatch the method and apparatus of downlink data and upstream data.
For achieving the above object, the application adopts following technical scheme:
A method for quick transmitting-receiving downlink data and upstream data, comprising:
UE is according to DiS, or the CRS process down-going synchronous after opening according to DiS and community X;
UE measures RSRP/RSRQ and/or the CSI information of community X based on DiS, and is reported to the Serving cell of work at present;
UE receives PDCCH and PDSCH on the X of community, the trigger message of the random access procedure on the X of detected cells, and performs random access procedure; UE measures and reports CSI information to community X.
Preferably, based on the reception timing of the DiS of community X, obtain the transmission timing of PRACH targeting signal in described random access procedure.
Preferably, the trigger message of the random access procedure on the PDCCH detected cells X on described UE reception community X comprises: described UE receives the PDCCH on the X of community before n+t0 subframe, the trigger message of the random access procedure on described PDCCH on the X of detected cells; Wherein, n is the subframe numbers that UE detects the indication information of activation cell X, and t0 is a constant.
Preferably, t0 equals 8.
Preferably, the trigger message of the random access procedure on described PDCCH on the X of detected cells is: UE starts to detect PDCCH order, 0≤k3<t0 in n+k3 subframe.
Preferably, the trigger message of the random access procedure on described PDCCH on the X of detected cells is: UE before the indication information receiving activation cell X, the trigger message PDCCHorder of the random access procedure on the X of detected cells.
Preferably, UE sends the PRACH targeting signal in described random access procedure before the subframe of indication information receiving activation cell X; Or UE, after receiving the activation indication information of community X, community X sends described PRACH targeting signal; Or after receiving the activation indication information of community X, then after postponing T ms, UE sends PRACH targeting signal on the X of community, 0≤T<t0.
Preferably, the trigger message of the random access procedure on described detected cells X comprises: UE extracts the trigger message of described random access procedure from the indication information of the activation cell X received.
Preferably, top n sub-frame of uplink after community X opens or the some subframes received before community X activation indication information, for the Random Access Channel PRACH resource that configuration UE uses in described random access procedure, wherein, N<t0, t0 are a constant.
Preferably, the subframe for PRACH is implicit or explicit configuration.
Preferably, the mode of described explicit configuration is: when the Serving cell of allocating cell X as Scell or dual link, be configured in which subframe when community X just opens and comprise the PRACH channel of configuration; Or, in described trigger message, indicate which subframe to comprise the PRACH channel of configuration.
Preferably, RSRP/RSRQ and the CSI information that described UE measures community X based on DiS comprises:
UE measures the RSRP/RSRQ of community X based on DiS, measures the CSI information of community X simultaneously, and described RSRP/RSRQ and CSI information is together reported to the current Serving cell activated of UE; Or,
UE reports a measuring amount to the current Serving cell activated, and is used to indicate RSRQ characteristic and CSI characteristic.
Preferably, when described UE measures the CSI information of community based on DiS, network sends to community X by measuring the CSI information obtained, for the PDSCH scheduling of community X before n+t0 subframe; Wherein, t0 is a constant.
Preferably, describedly measuring the RSRQ of community X based on DiS and comprise: measure RSRP based on DiS, and on the running time-frequency resource measuring RSSI, measure RSSI in high-level signaling configuration, according to measuring RSRP and RSSI obtained, determining RSRQ;
Wherein, for measuring the running time-frequency resource of RSSI be: one or more OFDM symbol of period assignment, or one or more subframes of period assignment; Or take RE as the running time-frequency resource of granularity, period assignment, the RE in each cycle is distributed in one or more OFDM symbol, or in one or more subframe.
Preferably, the described CSI information based on DiS measurement community X comprises: the running time-frequency resource for interferometry utilizing high-level signaling configuration UE, and the running time-frequency resource of this configuration is measured CSI information;
Wherein, the described running time-frequency resource for interferometry is: adopt the collocation method of ZP CSI-RS to be configured for the running time-frequency resource of interferometry; Or, in a subframe, adopt CRS-RS multiplexing method to expand obtain ZP CSI-RS, and indicate the ZP CSI-RS for interferometry of UE in the ZP CSI-RS obtained in described expansion with high-level signaling; Or, adopt the self-defined RE pattern of period assignment; Or, all RE of an OFDM symbol of period assignment, or all RE of multiple OFDM symbol, or all RE of a subframe, or all RE of multiple subframe.
Preferably, when described CSI information is A-CSI information, described UE measures and reports CSI information to community X and comprises: described UE receives the PDCCH on the X of community before n+t0 subframe, the trigger message of the A-CSI on described PDCCH on the X of detected cells, measures CSI and sends A-CSI report; Wherein, n is the subframe numbers that UE detects the indication information of activation cell X, and t0 is a constant.
Preferably, the trigger message of the A-CSI on described PDCCH on the X of detected cells comprises: UE starts in n+k1 subframe the trigger message detecting A-CSI, 0≤k1<t0.
Preferably, the trigger message of the A-CSI on described PDCCH on the X of detected cells comprises: before the indication information receiving activation cell X, the A-CSI trigger message of UE detected cells X.
Preferably, UE, after receiving the activation indication information of community X, this community X sends A-CSI report; Or after receiving the activation indication information of community X, then after postponing T ms, UE sends A-CSI report on the X of community, 0≤T<t0.
Preferably, the indication information of activation cell X is utilized to trigger the A-CSI report reporting of UE at community X.
Preferably, when the CSI information measurement of described UE is the measurement pattern based on CSI-RS, in the extra NZP CSI-RS divided in M subframe before after community X opens except the NZP CSI-RS except period allocated and CSI-IM resource being used in CSI measurement and CSI-IM resource, M<t0, t0 are a constant.
Preferably, when described UE is configured with two CSI subframe collection and reports the CSI information of corresponding subframe collection respectively, then to described two CSI subframe collection, described extra NZP CSI-RS and CSI-IM resource is configured respectively.
Preferably, to TDD system, front N1 the sub-frame of uplink that community X has just opened, community X works in and strengthens interference coordination and service adaptation eIMTA pattern or carry out work according to descending sub frame; Wherein, N1<t0.
Preferably, described extra NZP CSI-RS and CSI-IM resource are implicit configurations, and the cycle NZP CSI-RS of multiplexing high-level signaling configuration and the RE resource distribution of CSI-IM resource; Or described extra NZP CSI-RS and CSI-IM resource are explicit configurations.
Preferably, the mode of described explicit configuration is: be configured in high-level signaling NZP CSI-RS and the CSI-IM resource which subframe when community X just opens comprises additional configuration; Or, in the DL Grant sending to UE, increase the NZP CSI-RS of additional configuration and the indication information of CSI-IM resource; Or, while the X of activation cell, indicate the configuration information of extra CSI-RS and CSI-IM resource.
Preferably, in the subframe at described extra NZP CSI-RS and CSI-IM resource place, which RE is indicated not to be used for PDSCH transmission.
A terminal equipment for quick transmitting-receiving downlink data and upstream data, comprising: DiS receives and down-going synchronous unit, the first channel status are measured and report unit, Stochastic accessing unit, second channel state measurement and report unit; Wherein,
Described DiS receives and down-going synchronous unit, for receiving DiS, and the CRS process down-going synchronous after opening according to DiS or according to DiS and community X;
Described first channel status is measured and reports unit, for measuring RSRP/RSRQ and/or the CSI information of community X based on DiS, and is reported to the Serving cell of work at present;
Described downlink information receiving element, for receiving PDCCH and PDSCH on the X of community;
Described Stochastic accessing unit, the trigger message of the random access procedure on the X of detected cells, and perform random access procedure;
Described second channel state measurement and report unit, for measuring and reporting CSI information to community X.
Adopt method and apparatus of the present invention, the uplink synchronous process of UE can be accelerated, accelerate the process that UE measures and feeds back CSI, reduce community from the change-over time opened to required for the up-downgoing data really can receiving and dispatching UE, thus effectively support that community ON/OFF operates, and improves systematic function.
Accompanying drawing explanation
Fig. 1 is subframe structure schematic diagram;
Fig. 2 is that DiS transmits schematic diagram;
Fig. 3 is the flow chart opening community based on DiS;
Fig. 4 is flow chart of the present invention;
Fig. 5 is the flow chart based on DiS measurement report CSI;
Fig. 6 is the basic structure schematic diagram of terminal equipment in the application.
Embodiment
In order to make the object of the application, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the application is described in further details.
For the purpose of being described clearly, below the community performing community ON/OFF operation is designated as community X.The ON/OFF operation of effective support community X, need to reduce community X from the change-over time opened to required for the up-downgoing data really can receiving and dispatching UE, based on this, the present invention proposes community X is measured in base station DiS by configuration UE, accelerate the uplink synchronous process of UE, accelerate the process that UE measures and feeds back CSI, thus ShiUE community X can start to receive and dispatch up-downgoing data at faster speed after opening.
The basic flow sheet of method of the present invention as shown in Figure 4.
Step 401:UE can according to the down-going synchronous of DiS acquisition to community X of community X; Or after community X opens, the CRS after UE can open according to community X further strengthens down-going synchronous precision.
The most basically, directly can obtain the down-going synchronous to community X according to the DiS of community X, thus enable UE realize down-going synchronous as early as possible, accelerate the transmission of Downlink Control Information.Further, after community X opens, the CRS after can also opening according to community X further strengthens down-going synchronous precision.
Step 402:UE based on RSRP/RSRQ and/or the CSI information of the DiS measurement community X of community X, and is reported to the Serving cell of work at present.
UE can measure RSRP/RSRQ and/or CSI information according to DiS before the X of un-activation community, and reports, thus the information such as network RSRP/RSRQ and/or CSI that can report according to each UE determine the need of opening community X.Preferably, if reported in un-activation community X pre-test CSI information, CSI information of this report on the one hand can be used as the reference that network determines whether open community X; On the other hand, compared to the current CSI information measurement based on CRS, more early can obtain the state information of down channel, thus can start to send downlink data within the shorter time after community X opens.
Step 403:UE receives PDCCH and PDSCH on the X of community, the trigger message of the random access procedure on the X of detected cells, and performs random access procedure; UE measures and reports accurate CSI information.
The mode of carrying out Stochastic accessing and CSI information reporting in this step can adopt existing mode to carry out.But because in step 401, DiS based on community X accelerates the speed that UE obtains down-going synchronous, therefore, preferably, UE earlier can receive PDCCH and PDSCH on the X of community in this step, earlier trigger random access procedure, realize the uplink synchronous of UE and community X as early as possible, and then carry out the measurement of CSI information in advance and report.
So far, the flow process shown in Fig. 4 terminates.From above-mentioned Fig. 4 flow process, in the application, can following three kinds of process be passed through, effectively support the ON/OFF of community X operation: one, carry out down-going synchronous in advance according to DiS, accelerate the uplink synchronous process of UE; Two, before the X un-activation of community, the CSI information of community X is measured according to DiS; Three, carry out down-going synchronous in advance according to DiS, accelerate the process that UE measures and feeds back accurate CSI information.Below by three preferred embodiments, the specific implementation of above-mentioned three kinds of processing modes is described.
Embodiment one
The preferred implementation of UE uplink synchronous process is accelerated in the present embodiment introduction.
In order to transmit uplink control signal and upstream data at community X, first UE has needed the uplink synchronous with community X.In existing CA mechanism, suppose the Timing Advance group (TAG) that Scell and Pcell belongs to different, then need to trigger the random access procedure of UE on this Scell to obtain uplink synchronous.Suppose that UE receives the indication information activating this Scell at subframe n, then UE just starts the PDCCH order detecting the random access procedure triggering this Scell from subframe n+t0; Then, UE at least could send arbitrary access front signal (Preamble) at subframe n+t0+k2, and wherein k2 is more than or equal to 6, subframe n+t0+k2 is assigned with PRACH resource; Then, UE could obtain uplink synchronous after receiving Stochastic accessing response message (RAR).Wherein, t0 is a constant.Such as, in LTE CA system, t0 equals 8.Suppose that the time delay of RAR is 3ms, then in above-mentioned mechanism, in at least 17ms after sending from base station the indication information activating this Scell, UE can not carry out uplink, comprising can not feedback of down channel CSI information, and this must have impact on the performance of the downstream transmission based on community ON/OFF mechanism works.
In fact, because the DiS of community X carrys out cycle transmission with certain long period, be the reception timing of the downstream signal can determining community X based on this DiS, UE, namely complete down-going synchronous.Receive timing based on this, UE can obtain the transmission timing of PRACH targeting signal.Such as, the transmission timing using the reception of DiS timing as PRACH targeting signal.Depend on the design of DiS, UE obtains downlink reception precision regularly according to DiS can be different accordingly, but it is general or PRACH targeting signal can be sent according to this descending timing, because community X is after receiving PRACH targeting signal, TA order can be sent to adjust UE uplink thus to make UE obtain accurately uplink timing.The method of the random access procedure of process community X of the present invention is described below.According to different designs, the method for improvement random access procedure in various degree can be had, be described respectively below.
First the method that the present invention accelerates to trigger random access procedure is described.
First method is that hypothesis UE remains after the indication information receiving activation cell X, just starts the trigger message PDCCH order checking random access procedure.Note UE detects the indication information of activation cell X at subframe n.According to the hypothesis of current CA, UE can send the information such as SRS and CSI report in the n+t0 moment, and such UE is inevitable also can send PRACH targeting signal.So, the present invention proposes, because UE has obtained the down-going synchronous of community X according to DiS by the process of step 401, UE can not need n+t0 subframe by the time, but just can be able to start to detect PDCCH order in n+k3 subframe, k3 is less than t0 and is more than or equal to 0.Here, k3 be according to some other physical constraints UE activate Scell because of usually determining, k3 can provide some change-over times for the PRACH targeting signal of community X reception UE.Like this, UE can send the initial subframe number of PRACH targeting signal is the PRACH channel resource that n+k3+k2, subframe n+k3+k2 contain configuration.Based on the timing relationship of existing PDCCH order and PRACH targeting signal, namely k2 is more than or equal to 6.Especially, can be that k3 equals 2, then UE can send the initial subframe number of PRACH targeting signal be n+k3+k2=n+8, thus meets the restriction in existing CA system, UE being carried out on the Scell just activated to uplink.Or, because community X just opened with uplink synchronous before, UE does not have other uplink on the X of community, so can consider that configuration UE responds PDCCH order at faster speed, that is, the minimum value of k2 can be less than 6.
Second method supposes that UE is before the indication information receiving activation cell X, just can detect the PDCCH order of the random access procedure of triggering cell X.Adopt this method, PDCCH order needs send, namely with transmission across the PRACH targeting signal method triggering cell X of carrier dispatching on upper in another Serving cell (such as Pcell) activated of UE.This method is directly applied for situation about being configured with based on the downstream transmission across carrier dispatching community X.If allocating cell X adopts self scheduling, then need to process especially its PDCCH order.Specifically, can be all PDCCHorder to this community X, be all send upper in another Serving cell activated (such as Pcell) of UE; Also can be only the X of activation cell while, send PDCCHorder in another Serving cell being in state of activation, and remain at other moment UE detect PDCCH order on the X of community.
Suppose that UE detects that the subframe of PDCCH order is that subframe m, UE send PRACH targeting signal at subframe m+k4, subframe m+k4 is configured with PRACH channel here.If still use the timing relationship sending PRACH targeting signal from PDCCH order to UE in existing LTE CA, then k4 is more than or equal to 6.
Here, UE can not be limited and send the precedence that the subframe of PRACH targeting signal and UE receive the subframe of the indication information of activation cell X.Like this, when the subframe m+k4 that UE sends PRACH targeting signal to receive the subframe n of the indication information of activation cell X early than UE, network needs to enter so a kind of state sending before community X activates instruction just allocating cell X to UE: although community X does not send any signal at down direction, community X has started to detect arbitrary access front signal.And to RAR, then could send after needing Shi community X activation.
Or another kind of timing relationship is, restriction UE is after receiving the activation indication information of community X, just on the X of this community, sends PRACH targeting signal.Note UE detects PDCCH order at subframe m, then UE sends the subframe m+k4 of PRACH targeting signal must be after the subframe n of the indication information receiving activation cell X.Further, the subframe m+k4 that can limit UE transmission PRACH targeting signal must be that T is greater than 0ms but is less than or equal to t0ms after the subframe n of the indication information receiving activation cell X superposes a time delay T again.Here time delay T can provide some times for the PRACH targeting signal of community X reception UE.
The third method is the X of activation cell while, triggers the random access procedure of UE.Here, can be the parameter of the PRACH targeting signal by high-level signaling configuration UE, receive the indication information of activation cell X at UE after, just can carry out initiating random access procedure according to the parameter of the PRACH targeting signal of configuration.In the method, the trigger message of random access procedure just can not adopt PDCCH order, but is directly carried in the activation indication information of community X.Particularly, activating signaling can be indicating cell X activates while, imply the random access procedure indicating UE and need to start community X; Or, also can be increase new indication information, such as 1 bit in activation signaling, come explicitly to indicate whether to trigger UE at the random access procedure of community X.Or, also can be the signaling structure of amendment activation cell X, increase the necessary configuration parameter to PRACH targeting signal, thus UE be after the new signaling receiving this activation cell X, can initiating random access procedure.Note UE detects the indication information of activation cell X at subframe n, the initial subframe number that UE can send PRACH targeting signal is the PRACH channel resource that n+k2, subframe n+k2 contain configuration.Based on the timing relationship of existing PDCCHorder and PRACH targeting signal, namely k2 is more than or equal to 6.Or, if with the restriction of existing LTE system to the uplink on the Scell just activated, k2 can be defined and be more than or equal to t0.
Above in the description of random access procedure, be all define UE from receiving the trigger message (such as the activation instruction of PDCCH order or community X) of random access procedure to the timing relationship sending PRACH targeting signal, and require it is send PRACH targeting signal a subframe being configured with PRACH channel resource.The subframe of the PRACH of being configured with channel resource mentioned here can refer to and configure to UE's by high-level signaling, such as, at allocating cell X as Scell, or during dual link Serving cell, by the configuration information of the PRACH channel resource of this configuration signal configuration when community X opens.According to the mechanism of existing LTE CA system, PRACH resource of this configuration is according to certain period allocated.Like this, UE, meeting the activation instruction of PDCCHorder or community X under the prerequisite of timing relationship sending PRACH targeting signal, must wait until that the PRACH channel resource of period allocated could send arbitrary access front signal.
A kind of method increasing the PRACH channel resource of distribution is described below.In fact, because community X is when just opening, before it, in several sub-frame of uplink, generally upstream data can not be sent.Such as, because transmitting uplink data is generally need first to detect UL Grant, then postponing at least 4 ms really could send upstream data, then community X open after at least front 4 sub-frame of uplink be idle.Or if according to the restriction of existing LTE CA system, UE just can send upward signal at subframe n+t0, then community X after opening before be all idle in t0 sub-frame of uplink.The present invention proposes, configuring on the basis of the period allocated PRACH resource of UE, to configure extra PRACH resource, thus make UE can send PRACH targeting signal faster.Here, extra PRACH resource can be configured in UE to receive community X and activate in several subframes front after indication information.Such as, extra PRACH resource can Shi community X open after above-mentioned idle subframe in distribute; Or, also can be configure in the more subframe within the above-mentioned idle subframe after comprising community X and opening; Or suppose that UE is when receiving the activation indication information of community X, community X has opened and has served the uplink of some other UE, still can UE receive activate indication information subframe near PRACH resource outside allocation.Here, can also have other timing demands, such as, the subframe after only receiving the activation indication information of community X and after postponing a period of time T could distribute PRACH channel, and T is greater than 0 and is less than or equal to t0.Or, if community X just have activated uplink receiving operation before starting to send downstream signal, the ascending resource of the sub-frame of uplink before these communities X starts to send downstream signal also may be used for distributing PRACH channel resource, correspondingly, community X will detect PRACH targeting signal before starting to send downstream signal.Like this, meeting the trigger message (such as the activation instruction of PDCCHorder or community X) of random access procedure under the prerequisite of timing relationship sending PRACH targeting signal, do not need the PRACH channel resource that latent period distributes, UE can send PRACH targeting signal with speed fast as far as possible, thus obtains uplink synchronous fast.Thus UE can send upstream data and control information, wherein, the transmission of up CSI information is the necessary condition of the allocation of downlink channel resource that community X can optimize.
The PRACH resource that these newly increase can be implicit configuration.Such as, adopt certain principle, UE can judge can be extra in its p sub-frame of uplink receiving after the subframe n of activation cell X be exclusively used in and distribute PRACH channel resource.Such as, when considering the scheduling relation of UL Grant, p is more than or equal to 4; If according to the definition of existing LTE CA system, UE is when subframe n+t0 just can send upward signal, and p is more than or equal to t0.
Or the PRACH resource that these newly increase can be explicit configuration.Such as, at allocating cell X as Scell, or dual link Serving cell, during the PRACH resource of distributing in configuration cycle, can additional configuration PRACH channel in which subframe being simultaneously configured in community X.Or, in the PDCCH order sending to UE, increase the indication information that those subframes of instruction comprise the PRACH channel of additional configuration.Such as, suppose that PDCCH order place subframe is m, and suppose that UE sends PRACH targeting signal on subframe m+k2, wherein k2 is more than or equal to 6, then which subframe from subframe m+6 or which subframe can be indicated in PDCCH order to be assigned with extra PRACH channel resource.Or supposing to trigger random access procedure by the signaling of activation cell X, then can be activating in signaling the indication information increasing those subframes of instruction and comprise the PRACH channel of additional configuration simultaneously.
Above emphasis describes the PRACH channel subframe position in time of additional allocation, its frequency location independently can configure with high-level signaling, or also can give tacit consent to whole bandwidth according to 6 PRB is that unit is divided into multiple PRACH channel and may be used to the transmission of PRACH targeting signal, or maximum 6 the PRACH channels configured in whole bandwidth may be used for the transmission of PRACH targeting signal, or a PRACH channel is only had to can be used for the transmission of PRACH targeting signal in a configuration subframe.
Here, when UE receives the activation indication information of community X, community X had both been likely just open-minded, was also likely opened and served the uplink of some other UE.The method of the outer PRACH resource of the present invention's allocation presented above can be only for just opening the situation of community X, and is not used in community X in the situation of other UE of service.At this moment, can be message (the PDCCH order at the random access procedure triggering UE, or the signaling of activation cell X) a middle increase indication information, such as 1 bit, indicates the extra PRACH resource whether UE can determine except the PRACH resource of period allocated according to the method above the present invention.Or, the method for the outer PRACH resource of the present invention's allocation presented above can both for just open community X situation also for community X in the situation of other UE of service.At this moment, the collision of the PRACH resource of additional allocation and the uplink of other UE can be avoided by the uplink scheduling of community X.Adopt this method, because accelerate random access procedure, although the PRACH resource outside allocation adds ascending resource expense can improve downstream transmission efficiency on the whole.
Embodiment two
The preferred implementation measuring RSRP/RSRQ and CSI information according to DiS is provided in the present embodiment.
In order to effectively transmit downgoing control signal and downlink data at community X, the CSI information of down link is necessary condition.In existing LTE CA mechanism, suppose that UE receives the indication information of an activation Scell at subframe n, then UE just starts to feed back CSI information from subframe n+t0.Such as, in LTE CA system, t0 equals 8.In fact, the feedback of CSI information also depends on some other factor, such as, current whether uplink synchronous, whether there is available cycle CSI feedback channel resource, and trigger the time delay of CSI report aperiodic and report the time delay etc. that this CSI can be utilized to report the downlink data of scheduling UE from the CSI that community X receives UE.Like this, according to the mechanism of existing LTE CA, in general, do not have the CSI information of down channel to support the downlink transfer of UE in the time of ms more than ten after sending from base station the indication information activating this Scell, this must have impact on the performance of the downlink transfer based on community ON/OFF mechanism works.
In fact, in order to support that the ON/OFF of community X operates, DiS is introduced.DiS has possessed the function of down-going synchronous, also can measure RSRP and RSRQ of community X.The present invention proposes further, and design DiS, UE measures based on the CSI of DiS to make it support.The present invention is based on the basic flow sheet that DiS measures the CSI information of community X as shown in Figure 5.
The present invention proposes UE when measuring the RSRP/RSRQ of community X based on DiS, measures the CSI information of community X simultaneously, and RSRP/RSRQ and this CSI information are together reported to the current Serving cell (such as Pcell, macrocell) activated of UE.RSRP/RSRQ and the CSI information of this report can judge whether as network the foundation needing to open community X service UE, thus the ON/OFF of the process community X that can more optimize, whether CSI information more accurately reflects community X than RSRP/RSRQ and is applicable to serve this UE after all.In conjunction with RSRP/RSRQ and CSI information, how the present invention not limiting network determines that community X is the need of opening and closing.Here, in general, in order to realize power saving and reduce the function disturbed, when community X is in OFF state, DiS sends with long period, and its each cycle sends the running time-frequency resource taken also can not be too many, so be generally the long-time quality embodying down link based on the CSI information of DiS measurement, such as, long term channel (CQI) characteristic, and also general DiS is for measuring broadband CQI characteristic.Here, the present invention does not limit, and can only measure the long-term broadband CQI of down link based on DiS.In fact, depend on design and the transmission cycle of DiS, the subband CQI of down link can be measured based on DiS; When a community X sends DiS on multiple antenna port, UE even can measure the pre-coding matrix for MIMO transmission of down link based on DiS.As a special case, because RSRQ itself is also the characteristic embodying useful signal and interference, it and CSI have certain similitude, by defining the method for measurement of interference signal, also can be that UE reports a measuring amount to the current Serving cell activated and indicates RSRQ characteristic and CSI characteristic simultaneously.
Next, when network determines to open community X, network can send to community X using the CSI information of UE as a parameter, thus community X obtains the information about UE channel status.Here CSI can be CSI information that is long-term and broadband, but it provides reference for the descending scheduling of community X to UE in a word, avoids downlink data transmission blindly.Or depend on the design of DiS, CSI information has here been more accurate ground information, thus community X directly can compare accurately descending scheduling to this UE.Because this can CSI information, community X does not need by the time subframe n+t0 just can compare the downlink transfer of efficient scheduling UE.Here, can be define UE from the activation indication information place subframe n receiving community X just detect PDCCH and PDSCH of Scell; Or can be define UE from the next subframe of activation indication information place subframe n receiving community X, namely subframe n+1 starts PDCCH and PDSCH detecting Scell; Or consider other timing requirements, can be define UE from the activation indication information place subframe n receiving community X and after postponing T subframe, namely subframe n+T starts PDCCH and PDSCH detecting Scell, T be greater than 0 and be less than or equal to t0 here.Here time delay T can provide some times for transmitting between X and UE of community PDCCH and PDSCH.
Next, UE, while PDCCH and PDSCH receiving community X, can also measure the accurately CSI information of community X, and be reported to community X, or be reported to another Serving cell (such as, Pcell, macrocell), thus indirectly reports the CSI of community X; Like this, community X can with PDCCH and PDSCH of CSI message scheduling UE more accurately and timely.
The method that the present invention measures RSRQ and CSI is described below.
In existing LTE system, RSRQ is defined as RSRP divided by RSSI.Wherein RSRP be CRS the average energy of RE that takies of CRS on the ofdm symbols, RSSI is defined as CRS institute overall average energy on the ofdm symbols.That is in the definition of RSSI, to this community, it contain CRS in this cell signal the overall average energy of CRS RE on the ofdm symbols and data RE; To adjacent cell, it contain CRS in adjacent cell signal the overall average energy of CRS RE on the ofdm symbols and data RE.But consider the demand of the detecting reliability of DiS, DiS generally needs to configure larger frequency reuse.That is, send a community on the RE of DiS, its neighbor cell does not generally send any signal on these RE.The benefit done like this is the increase in the detecting reliability of the DiS of community, but it result also in the characteristic of RSRQ measured based on DiS and is different from existing LTE system and measures based on the RSRQ of CRS, thus can not the characteristic of actual embodiment interference signal.Different from DiS, on the RE of a community transmission CRS, neighbor cell can send data-signal.
First the present invention proposes the method for measurement of a kind of RSRQ based on DiS.Because according to analysis above, the OFDM symbol at DiS place is also not suitable for measuring RSSI, so the running time-frequency resource for measuring RSSI of proposition high-level signaling configuration UE of the present invention.This high-level signaling can be broadcast, also can to each UE assignment configuration.Here running time-frequency resource can be that granularity configures with OFDM symbol, also can be granularity with RE.Such as, for measuring the OFDM symbol that the running time-frequency resource of RSSI can be period assignment, or multiple OFDM symbol, or a subframe, or multiple subframe.Here, concerning a UE, the OFDM symbol for rssi measurement of high-level signaling configuration can be other OFDM symbol except the OFDM symbol at the DiS place distributing this UE; Or, also can be that all OFDM symbol in a subframe all can be joined, but depending on base station realizes whether configuration packet contains the OFDM symbol of DiS for rssi measurement.Concerning a UE, high-level signaling configuration in the subframe of rssi measurement, if comprise DiS in subframe, can be that other OFDM symbol except the OFDM symbol that takies of the DiS except distributing this UE may be used for RSSI; Or, which by the OFDM symbol in another high-level signaling configuration subframe can not be used for measuring RSSI, such as, the superset of a configuration OFDM symbol taken by the DiS of multiple user, be designated as R, then other OFDM symbol be configured in the subframe of rssi measurement except set R may be used for rssi measurement; Or UE also can measure RSSI in all OFDM symbol of the subframe for rssi measurement of high-level signaling configuration.Or, only can be distributed in an OFDM symbol for the RE measuring RSSI in one-period, or in multiple OFDM symbol, or in a subframe, or in multiple subframe.Cycle for measuring the running time-frequency resource of RSSI generally can be identical with the transmission cycle of DiS, its time location and DiS close.Specifically, the above-mentioned OFDM symbol for rssi measurement can be positioned at same subframe with DiS, or is positioned at other subframes near the subframe of DiS place; The above-mentioned subframe for rssi measurement can be DiS place subframe, or other subframes near the subframe of DiS place.Here, when UE needs the RSRQ measuring community X, need Received signal strength in the frequency of community X, the length that UE measures the window of community X can comprise multiple subframe, thus UE a subframe in window can measure RSRP based on DiS, and another subframe simultaneously in window measures RSSI.Like this, UE measures the RSRP of community X based on DiS, and utilizes the running time-frequency resource for measuring RSSI to measure the RSSI of community X, thus UE can complete the measurement of RSRP and RSSI within a bit of time receiving DiS simultaneously, then determines RSRQ according to the two.
In existing LTE system, the CRS of this community and the power of other downstream signals are also contained in rssi measurement value, but adopt method above, when DiS place OFDM symbol is not used in and measures RSSI, namely the RSSI that said method is measured does not comprise any signal of this community, the deviation of the rssi measurement value of this RSSI causing said method measurement to obtain and existing LTE system.According to based on the RSRP measured value RSRP of DiS and above-mentioned rssi measurement value RSSI
nODiS, according to the number of the CRS RE of actual measurement in the rssi measurement of existing LTE system and the power of CRS RE, above-mentioned rssi measurement value can be revised thus make it closer to the rssi measurement value of existing LTE system.
Because the power of the power of CRS RE and DiS RE can be different, can revise with the power ratio p of CRS RE and DiS RE, i.e. RSRP
diS=
prSRP.Parameter p can configure with high-level signaling, or can calculate by other parameters.If do not revise this power difference, then RSRP
diS=RSRP.
A kind of RSSI of existing LTE system is defined as the mean receiving power on each PRB comprised in the OFDM symbol of CRS.To the community only configuring CRS port 0, an OFDM symbol of a PRB has two CRS RE, so superposed the value of the RSRP of twice in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 2RSRP
diS+ RSSI
nODiS.To the community of configuration CRS port 0 and 1, or the community of configuration CRS port 0,1,2 and 3, an OFDM symbol of a PRB has four CRS RE, so superposed the value of the RSRP of 4 times in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 4RSRP
diS+ RSSI
nODiS.
The RSSI of another kind of existing LTE system is the mean receiving power of all OFDM symbol on a PRB of a measurement subframe.To the community only configuring CRS port 0, a PRB of subframe has 8 CRS RE, so superposed the value of 8/Nsym RSRP doubly in the rssi measurement value of existing LTE system, Nsym has equaled 14 or 12.Correspondingly, when measuring based on DiS, RSSI can be modified to 8RSRP
diS/ Ns
ym+RSSI
nODiS.To the community configuring CRS port 0 and CRS port one, a PRB of subframe has 16 CRS RE, so superposed the value of 16/Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 16RSRP
diS/ Ns
ym+RSSI
nODiS.To the community of configuration CRS port 0,1,2 and 3, a PRB of subframe has 24 CRS RE, so superposed the value of 24/Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 24RSRP
diS/ Nsym+RSSI
nODiS.
The calculating of the above-mentioned RSSI to existing LTE system is configured with general CRS pattern in hypothesis subframe, and namely CRS port 0 takies 4 OFDM symbol.If the subframe of allocating and measuring RSSI is MBSFN sub-frame, then because the CRS resource occupation of MBSFN is less, the modifying factor of RSSI is also different.To the community only configuring CRS port 0, a PRB of subframe has 2 CRS RE, so superposed the value of 2/Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 2RSRP
diS/ Nsym+RSSI
nODiS.To the community configuring CRS port 0 and CRS port one, a PRB of subframe has 4 CRS RE, so superposed the value of 4/Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 4RSRP
diS/ N
sym+RSSI
nODiS.To the community of configuration CRS port 0,1,2 and 3, a PRB of subframe has 8 CRS RE, so superposed the value of 8/Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 8RSRP
diS/ Nsym+RSSI
nODiS.
In addition, suppose in subframe, to be configured with general CRS pattern, if UE is the data area in subframe in realizing, such as, other OFDM symbol before removing beyond n OFDM symbol measures RSSI, then can carry out modified R/S SI according in esse CRS RE number.Such as, suppose that front 2 OFDM symbol of subframe are not used in and measure RSSI.To the community only configuring CRS port 0, a PRB of subframe has 6 CRS RE, so superposed the value of 6Nsym RSRP doubly in the rssi measurement value of existing LTE system, Nsym has equaled 14 or 12.Correspondingly, when measuring based on DiS, RSSI can be modified to 6RSRP
diS/ N
sym+RSSI
nODiS.To the community configuring CRS port 0 and CRS port one, a PRB of subframe has 12 CRS RE, so superposed the value of 12/Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 12RSRP
diS/ Nsym+RSSI
nODiS.To the community of configuration CRS port 0,1,2 and 3, a PRB of subframe has 16 CRS RE, so superposed the value of 16Nsym RSRP doubly in the rssi measurement value of existing LTE system.Correspondingly, when measuring based on DiS, RSSI can be modified to 16RSRP
diS/ Nsym+RSSI
nODiS.
To MBSFN sub-frame, if UE is the data area in subframe in realizing, such as, other OFDM symbol before removing beyond n OFDM symbol measures RSSI, because data area does not exist CRS RE, then measures the value RSSI of the RSSI obtained in the method above
nODiSconsistent with existing LTE system, thus do not need to revise.
As mentioned above, what need under different situations is different to the weighted factor of RSRP, so can be configure a weighted factor f with high-level signaling, thus UE can according to the weighted factor f modified R/S SI of this configuration, namely UE is when measuring based on DiS, and RSSI can be modified to fRSRP
diS+ RSSI
nODiS.
Can be only only send out the situation of DiS for the current OFF of the being in state of community X to the modification method of RSSI above, or, also can be that community X is in the state of OFF and ON simultaneously.
Like this, UE measures the RSRP of community X based on DiS, and utilize the running time-frequency resource for measuring RSSI to measure the correction value of the RSSI of community X, thus UE can complete the measurement of the correction value of RSRP and RSSI within a bit of time receiving DiS simultaneously, then determine RSRQ according to the two.In addition, when being in ON state in current area, measure the RSRP of community X based on DiS, when measuring RSSI, remain and measure based on the mean receiving power on each PRB comprised in the OFDM symbol of CRS, thus be consistent with the rssi measurement of existing LTE system, thus do not need to revise.Or, when being in ON state in current area, the RSRP of community X is measured based on DiS, when measuring RSSI, remain the mean receiving power of all OFDM symbol on a PRB of a measurement subframe, at this moment the power of CRS is included in rssi measurement, thus is consistent with the rssi measurement of existing LTE system, does not need to revise.Like this, UE measures the RSRP of community X based on DiS, and adopts the method consistent with existing LTE system to measure RSSI, thus UE can complete the measurement of the correction value of RSRP and RSSI within a bit of time receiving DiS simultaneously, then determines RSRQ according to the two.
The present invention also proposes the method for measurement of a kind of CSI based on DiS.Here, the channel strip of the downlink characteristics of UE can obtain based on DiS measurement.To the measurement of the interference sections of downlink characteristics, the running time-frequency resource for interferometry of proposition high-level signaling configuration UE of the present invention.This high-level signaling can be broadcast, also can configure respectively each UE.In fact, when community X is in OFF state, except the RE that the DiS of community X takies, every other RE can as interferometry resource.Here, the present invention proposes, still can the collocation method of multiplexing existing ZP CSI-RS, namely with 4 RE for granularity configures CSI-IM.Or the present invention proposes, in a subframe, according to existing CRS-RS multiplexing method, namely time upper length is Walsh (Walsh) code of 2, can expand more ZP CSI-RS, and carrys out the ZP CSI-RS for interferometry of configuration UE with high-level signaling.Here, can not need to limit the relation of ZP CSI-RS when this ZP CSI-RS and UE carry out normal downlink data transmission, such as, not need all ZP CSI-RS of restriction must be contained in same more short-period empty ZP CSI-RS.Or the present invention proposes, and the running time-frequency resource for interferometry of UE can adopt the new RE pattern of period assignment, in one-period, these RE are configured in an OFDM symbol, or in multiple OFDM symbol, or in a subframe, or in multiple subframe.Such as, in a subframe, the RE of interferometry resource occupation breaks up in whole subframe.Here, all RE in the subframe of DiS place may be used to configuration interferometry resource, and this may be used for the situation of other sub-frame configuration interferometry resources beyond the subframe at DiS place; Or, other RE except the RE that can be used for DiS in the subframe of DiS place just can configure interferometry resource, such as, may be used for the situation configuring interferometry resource in the subframe at DiS place.Or the present invention proposes, and the running time-frequency resource for interferometry of UE can be all RE of an OFDM symbol of period assignment, or all RE of multiple OFDM symbol, or all RE of a subframe, or all RE of multiple subframe.Cycle for the running time-frequency resource of interferometry generally can be identical with the transmission cycle of DiS, its time location and DiS close, thus UE can complete the channel strip of CSI and the measurement of interference sections within a bit of time receiving DiS simultaneously, thus obtain complete CSI information.
Embodiment three
The present embodiment provides accelerates measurement and the preferred implementation reporting accurate CSI information to community X.
In order to effectively transmit downgoing control signal and downlink data at community X, the CSI information of down link is necessary condition.In existing LTE CA mechanism, suppose that UE receives the indication information of an activation Scell at subframe n, then UE just starts to feed back CSI information from subframe n+t0.Such as, in LTE CA system, t0 equals 8.In fact, the feedback of CSI information also depends on some other factor, such as, current whether uplink synchronous, whether there is available cycle CQI feedback channel resource, and trigger the time delay of CSI report aperiodic and report the time delay etc. that this CSI can be utilized to report the downlink data of scheduling UE from the CSI that community X receives UE.Like this, according to the mechanism of existing LTE CA, in general, do not have the CSI information of down channel to the downlink transfer of a UE in the time of ms more than ten after sending from base station the indication information activating this Scell, this must have impact on the performance of the downlink transfer based on community ON/OFF mechanism works.
In fact, in order to support that the ON/OFF of community X operates, DiS signal is introduced.DiS signal has possessed the function of down-going synchronous, thus after UE carries out down-going synchronous according to DiS signal, can accelerate the process that its CSI measures and reports.The method that the CSI that process UE of the present invention is described below measures and feeds back.According to different designs, can have CSI in various degree measure and feedback improve one's methods, be described respectively below.
First describe the present invention and accelerate the method for UE to the accurate CSI information feed back of community X.
First method is that hypothesis UE remains after the indication information receiving activation cell X, just starts to measure CRS or NZP CSI-RS and CSI-IM of community X thus obtains accurate CSI feedback information, and being reported to community X.According to the hypothesis of current LTE CA, note UE receives at subframe n and activates the indication information of Scell, then UE could reporting CSI information as far back as the n+t0 moment.The present invention proposes, because UE has obtained the down-going synchronous of community X according to DiS, UE can not need n+t0 by the time, but just can start at n+k1 the trigger message detecting A-CSI.K1 is less than t0 and is more than or equal to 0.Here, when k1 is greater than 0, some times can be provided for transmitting between X and UE of community PDCCH.A-CSI can use UL Grant to trigger, and DL Grant also can be used to trigger, and correspondingly, needs in DL Grant, increase the bit triggering A-CSI.Like this, UE can feed back A-CSI report at subframe n+k1+k.Here, subframe n+k1+k is sub-frame of uplink, and its UL Grant can be consistent with existing LTE system with the timing relationship of the sub-frame of uplink sending A-CSI, and namely to FDD system, k equals 4; To TDD system, k determines according to the timing relationship of TDD uplink-downlink configuration, and k is more than or equal to 4.Especially, for FDD, can be that k1 equals 4, then UE sends the subframe of A-CSI aperiodic be n+k1+k=n+8, thus meets the restriction in existing CA system, UE being carried out on the Scell just activated to uplink.Or, also can regulation UE be at subframe max(n+k1+k, n+t0) feed back A-CSI report, thus meet the restriction in existing CA system, UE being carried out on the Scell just activated to uplink.
Second method supposes that UE is before the indication information receiving activation cell X, just can detect the A-CSI trigger message of triggering cell X.A-CSI can use UL Grant to trigger, and DL Grant also can be used to trigger.Adopt this method, A-CSI trigger message needs send, namely with transmission across the A-CSI method triggering cell X of carrier dispatching on upper in another Serving cell (such as Pcell) activated of UE.This method is directly applied for the situation of configuration based on the downstream transmission across carrier dispatching community X.If allocating cell X adopts self scheduling, then need to trigger its A-CSI to process especially.Specifically, can be trigger all A-CSI of this community X, be all send upper in another Serving cell activated (such as Pcell) of UE; Also can be only when activation cell X, obtain another Serving cell and send A-CSI trigger message being in state of activation, and remain at other moment UE detect A-CSI trigger message on the X of community.
Suppose that UE detects that the subframe of A-CSI trigger message is that subframe m, UE send A-CSI report at subframe m+k5, subframe m+k5 is sub-frame of uplink here.Here, although A-CSI trigger message can send before UE receives the indication information of activation cell X, can limit UE is after receiving the activation indication information of community X, on the X of this community, just send A-CSI report.Namely remember that UE detects A-CSI trigger message at subframe m, then UE sends the subframe m+k5 of A-CSI report must be after the subframe n of the indication information receiving activation cell X.Further, the subframe m+k5 that can limit UE transmission A-CSI report must be that T is greater than 0ms but is less than or equal to t0ms after the subframe n receiving the indication information activating Scell superposes a time delay T again.Here time delay T can carry some change-over times for the A-CSI report of community X reception UE.
The third method is the X of activation cell while, triggers UE and reports at the A-CSI of community X.Here, can be the indication information of the A-CSI that will feed back by high-level signaling configuration UE and the running time-frequency resource that will take, receive the indication information of activation cell X at UE after, just can feed back A-CSI on the running time-frequency resource of this configuration and report.Here, activating signaling can be that the implicit UE that indicates needs to report A-CSI indicating cell X activates while; Or, also can be increase new indication information, such as 1 bit in activation signaling, carry out the explicit A-CSI report indicating whether to trigger UE.Or, also can be the signaling structure of amendment activation cell X, the indication information increasing the A-CSI that will feed back and the running time-frequency resource that will take, thus UE is after the new signaling receiving this activation cell X, can measure and report A-CSI.Note UE detects that at subframe n initial subframe number that the indication information of activation cell X, UE can send A-CSI be n+k6, subframe n+k6 is sub-frame of uplink, and according to the timing relationship of existing LTE system, k6 is more than or equal to 4.Or, if with the restriction of existing LTE system to the uplink on the Scell just activated, k6 can be defined and be more than or equal to t0.
According to the difference of the downlink transfer pattern of UE, the CSI measurement method of UE is different.To the measurement pattern based on CRS, after community X opens and sends CRS, just can start CSI and measure; And to the measurement pattern based on CSI-RS, then after Shi community opens, and when configuration all occurs to NZP CSI-RS and CSI-IM of this UE, just likely must carry out CSI measurement.Here, at allocating cell X as Scell, or during dual link Serving cell, by NZP CSI-RS and CSI-IM of the distribution UE of high-rise configuration signal configuration when community X opens.NZP CSI-RS and CSI-IM is that in existing LTE system, its minimum period is 5ms according to certain period allocated.That is, UE measures based on NZP CSI-RS and CSI-IM and reports that the process of CSI is generally measured slow than the CSI based on CRS.Method disclosed in the following description of the invention proposes how to accelerate UE and measures and report based on NZP CSI-RS and CSI-IM.
Because community X is when just opening, do not have the accurately downlink data transmission of CSI Informational support before it in several descending sub frame, down transmission efficiency is not high.So, although NZP CSI-RS and CSI-IM outside allocation adds resource overhead can improve down transmission efficiency on the whole.In order to accelerate the measurement of UE based on NZPCSI-RS and CSI-IM, the present invention proposes after community X opens, on the period allocated NZP CSI-RS of configuration UE and the basis of CSI-IM resource, the NZP CSI-RS in former subframes after community X opens outside allocation and CSI-IM resource.Thus UE can utilize these extra resources to accelerate CSI measurement, thus feed back accurately CSI information as far as possible fast.If do not send downlink data in several descending sub frame before community X just opens, then NZP CSI-RS and CSI-IM outside allocation can not bring any downlink throughput capacity loss.
Here, if there are other timing demands, the subframe after can being the activation indication information only receiving community X and after postponing a period of time T could distribute NZP CSI-RS and CSI-IM resource.Here, T is greater than 0 and is less than or equal to t0.Here, newly assigned NZP CSI-RS distributes by one or more subframe after UE receives the activation indication information of community X.And for CSI-IM, can be consistent with NZP CSI-RS, distribute in one or more subframe after UE receives the activation indication information of community X; Or, also can using the resource of the subframe before UE receives the activation indication information of community X as CSI-IM, but this increases the process of UE, namely before receiving the activation indication information of community X, also must process CSI-IM, cause extra complexity and energy loss.Here, if during the normal downlink data transmission of UE on the X of community, be configured with two subframe collection and report CSI information respectively, then can be these two CSI subframe collection corresponding, configure extra NZP CSI-RS and CSI-IM resource respectively.
To TDD system, suppose that front M the sub-frame of uplink that community X has just opened is disabled (M<t0), former subframes when then a kind of method Shi Shi community X just opens carry out work according to the TDD uplink-downlink configuration that a kind of descending sub frame ratio is larger, after the accurate CSI information obtaining UE, just convert back normal TDD uplink-downlink configuration, be namely equivalent to community X and work in enhancing interference coordination and service adaptation (eIMTA) pattern.Further, in former the subframes of community X, can according to the work pattern of full downlink sub-frame.Can only for distributing NZP CSI-RS and CSI-IM resource in these descending sub frames newly increased; Or, in these descending sub frames newly increased, CRS, NZP CSI-RS and CSI-IM resource can be transmitted simultaneously; Or, downlink data and downgoing control signal can also be sent according to the method for normal sub-frames in the descending sub frame that these newly increase.Adopt in this way, can to TDD system, accelerate UE and obtain accurate down-going synchronous, and accelerate UE and feed back accurately CSI information, and accelerate the transmission of downlink data.
The NZP CSI-RS that these newly increase and CSI-IM resource can be implicit configurations.Such as, adopt certain principle, UE can judge the subframe at NZP CSI-RS and CSI-IM resource place.Can be NZP CSI-RS and the CSI-IM resource of only additional allocation in a subframe, such as, can be the NZP CSI-RS on the activation indication information place subframe n that UE receives community X outside allocation and CSI-IM resource; Or, can be the next subframe receiving the activation indication information place subframe n of community X at UE, the NZP CSI-RS namely on subframe n+1 outside allocation and CSI-IM resource; Or considering other timing requirements, can be receive the activation indication information place subframe n of community X and after postponing T subframe, the NZP CSI-RS namely on subframe n+T outside allocation and CSI-IM resource, T is greater than 0 and is less than or equal to t0 here at UE.Or, also can be NZP CSI-RS and the CSI-IM resource of all additional allocation in multiple subframe.Here, in a subframe, the resource newly increased can be the cycle NZP CSI-RS of multiplexing high-level signaling configuration and the RE resource distribution of CSI-IM resource.
Or the NZP CSI-RS that these newly increase and CSI-IM resource can be explicit configurations.Such as, at allocating cell X as Scell, or dual link Serving cell, when NZPCSI-RS and the CSI-IM resource of configuration cycle distribution, being configured in can additional configuration NZP CSI-RS and CSI-IM resource in those subframes when community X just opens simultaneously.Or, in the DL Grant sending to UE, increase the instruction NZP CSI-RS of additional configuration and the indication information of CSI-IM resource.Here, in order to reduce signaling consumption, it can be the RE resource distribution with high-level signaling configuration NZP CSI-RS and CSI-IM resource, or the cycle NZP CSI-RS of multiplexing high-level signaling configuration and the RE resource distribution of CSI-IM resource, thus only need to indicate the NZP CSI-RS and the CSI-IM resource that whether there is additional allocation in present sub-frame.Or, change the mechanism of an activation community, thus while the X of activation cell, indicate the configuration information of extra CSI-RS and CSI-IM resource.
Above emphasis describes NZP CSI-RS and the CSI-IM resource subframe position in time of additional allocation, its RE position taken in a subframe independently can configure by signaling, also can be that acquiescence configures NZP CSI-RS with high-level signaling and CSI-IM resource adopts identical RE resource.
Here, when UE receives the activation indication information of community X, community X had both been likely just open-minded, was also likely opened and served the downlink transfer of some other UE.The method of the outer NZP CSI-RS of the present invention's allocation presented above and CSI-IM resource can be situation about only just having opened for community X, and is not used in community X in the situation of other UE of service.At this moment, can be message (the UL Grant in the A-CSI report triggering UE, DL Grant, or the signaling of activation cell X) a middle increase indication information, such as 1 bit, indicates UE whether can determine extra NZP CSI-RS except the NZP CSI-RS of period allocated and CSI-IM resource and CSI-IM resource according to the method above the present invention.Or, the method for the outer NZP CSI-RS of the present invention's allocation presented above and CSI-IM resource can both for just open community X situation also for community X in the situation of other UE of service.At this moment, need to consider that the NZP CSI-RS of these additional allocation and CSI-IM resource are carrying out the impact of the UE of downlink transfer on other.
The method above of employing, on the basis of cycle NZP CSI-RS and CSI-IM resource, is assigned with extra NZP CSI-RS and CSI-IM resource.Which in order to avoid the impact that these extra resources map the RE of PDSCH, in the subframe of these additional allocation NZP CSI-RS and CSI-IM resource, need to indicate RE not to be used for PDSCH transmission.This can imply and obtain, and such as, obtaining which RE according to the configuration of ZPCSI-RS during normal downlink transfer can not be used for PDSCH transmission, and namely the ZP CSI-RS of additional configuration takies identical RE resource in a subframe.This also can use explicit configuration signal to realize, and such as, is configured in these subframes sending extra NZP CSI-RS and CSI-IM resource, has which RE to be not used in PDSCH transmission with high-level signaling.This signaling can be broadcast, also can configure respectively each UE.
As above, the specific implementation of transmitting-receiving downlink data and upstream data method fast in the application is.Present invention also provides a kind of terminal equipment, may be used for the method implementing above-mentioned the application.Fig. 6 is the basic structure schematic diagram of this equipment.As shown in Figure 6, this equipment comprises: DiS receives and down-going synchronous unit, the first channel status are measured and report unit, Stochastic accessing unit, second channel state measurement and report unit.
In the said equipment, DiS receives and down-going synchronous unit, for receiving DiS, and realizes down-going synchronous according to DiS, or the CRS process down-going synchronous after opening according to DiS and community X;
First channel status is measured and is reported unit, for measuring RSRP/RSRQ and/or the CSI information of community X based on DiS, and is reported to the Serving cell of work at present.This unit can adopt the mode of embodiment two to carry out the measurement of RSRP/RSRQ and/or CSI information.
Downlink information receiving element, for receiving PDCCH and PDSCH on the X of community.
Stochastic accessing unit, the trigger message of the random access procedure on the X of detected cells, and perform random access procedure.This unit specifically can adopt the mode in embodiment one to accelerate random access procedure.
Second channel state measurement and report unit, for measuring and reporting CSI information to community X.This unit can adopt the mode in embodiment three carry out the measurement of accurate CSI information and report.
From the specific implementation of above-mentioned the application, in the application, effectively reduce community X from the change-over time opened to required for transmitting-receiving up-downgoing data, more effectively support the ON/OFF operation of community X.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (27)
1. receive and dispatch a method for downlink data and upstream data fast, comprising:
UE is according to DiS, or the CRS process down-going synchronous after opening according to DiS and community X;
UE measures RSRP/RSRQ and/or the CSI information of community X based on DiS, and is reported to the Serving cell of work at present;
UE receives PDCCH and PDSCH on the X of community, the trigger message of the random access procedure on the X of detected cells, and performs random access procedure; UE measures and reports CSI information to community X.
2. method according to claim 1, is characterized in that, based on the reception timing of the DiS of community X, obtains the transmission timing of PRACH targeting signal in described random access procedure.
3. method according to claim 1, it is characterized in that, the trigger message of the random access procedure that described UE receives on the PDCCH detected cells X on the X of community comprises: described UE receives the PDCCH on the X of community before n+t0 subframe, the trigger message of the random access procedure on described PDCCH on the X of detected cells; Wherein, n is the subframe numbers that UE detects the indication information of activation cell X, and t0 is a constant.
4. method according to claim 3, is characterized in that, t0 equals 8.
5. method according to claim 4, is characterized in that, the trigger message of the random access procedure on described PDCCH on the X of detected cells is: UE starts to detect PDCCH order, 0≤k3<t0 in n+k3 subframe.
6. method according to claim 4, it is characterized in that, the trigger message of the random access procedure on described PDCCH on the X of detected cells is: UE before the indication information receiving activation cell X, the trigger message PDCCH order of the random access procedure on the X of detected cells.
7. method according to claim 6, is characterized in that, UE sends the PRACH targeting signal in described random access procedure before the subframe of indication information receiving activation cell X; Or UE, after receiving the activation indication information of community X, community X sends described PRACH targeting signal; Or after receiving the activation indication information of community X, then after postponing T ms, UE sends PRACH targeting signal on the X of community, 0≤T<t0.
8. method according to claim 1, is characterized in that, the trigger message of the random access procedure on described detected cells X comprises: UE extracts the trigger message of described random access procedure from the indication information of the activation cell X received.
9. method according to claim 1, it is characterized in that, top n sub-frame of uplink after community X opens or the some subframes received before community X activation indication information, for the Random Access Channel PRACH resource that configuration UE uses in described random access procedure, wherein, N<t0, t0 are a constant.
10. method according to claim 9, is characterized in that, the subframe for PRACH is implicit or explicit configuration.
11. methods according to claim 10, is characterized in that, the mode of described explicit configuration is: when the Serving cell of allocating cell X as Scell or dual link, be configured in which subframe when community X just opens and comprise the PRACH channel of configuration; Or, in described trigger message, indicate which subframe to comprise the PRACH channel of configuration.
12. methods according to claim 1, is characterized in that, RSRP/RSRQ and the CSI information that described UE measures community X based on DiS comprises:
UE measures the RSRP/RSRQ of community X based on DiS, measures the CSI information of community X simultaneously, and described RSRP/RSRQ and CSI information is together reported to the current Serving cell activated of UE; Or,
UE reports a measuring amount to the current Serving cell activated, and is used to indicate RSRQ characteristic and CSI characteristic.
13. methods according to claim 1, is characterized in that, when described UE measures the CSI information of community based on DiS, network sends to community X by measuring the CSI information obtained, for the PDSCH scheduling of community X before n+t0 subframe; Wherein, t0 is a constant.
14. methods according to claim 12, it is characterized in that, describedly measure the RSRQ of community X based on DiS and comprise: measure RSRP based on DiS, and on the running time-frequency resource measuring RSSI, measure RSSI in high-level signaling configuration, according to measuring RSRP and RSSI obtained, determine RSRQ;
Wherein, for measuring the running time-frequency resource of RSSI be: one or more OFDM symbol of period assignment, or one or more subframes of period assignment; Or take RE as the running time-frequency resource of granularity, period assignment, the RE in each cycle is distributed in one or more OFDM symbol, or in one or more subframe.
15. methods according to claim 12, is characterized in that, the described CSI information based on DiS measurement community X comprises: the running time-frequency resource for interferometry utilizing high-level signaling configuration UE, and the running time-frequency resource of this configuration is measured CSI information;
Wherein, the described running time-frequency resource for interferometry is: adopt the collocation method of ZP CSI-RS to be configured for the running time-frequency resource of interferometry; Or, in a subframe, adopt CRS-RS multiplexing method to expand obtain ZP CSI-RS, and indicate the ZP CSI-RS for interferometry of UE in the ZP CSI-RS obtained in described expansion with high-level signaling; Or, adopt the self-defined RE pattern of period assignment; Or, all RE of an OFDM symbol of period assignment, or all RE of multiple OFDM symbol, or all RE of a subframe, or all RE of multiple subframe.
16. methods according to claim 1, it is characterized in that, when described CSI information is A-CSI information, described UE measures and reports CSI information to community X and comprises: described UE receives the PDCCH on the X of community before n+t0 subframe, the trigger message of the A-CSI on described PDCCH on the X of detected cells, measures CSI and sends A-CSI report; Wherein, n is the subframe numbers that UE detects the indication information of activation cell X, and t0 is a constant.
17. methods according to claim 16, is characterized in that, the trigger message of the A-CSI on described PDCCH on the X of detected cells comprises: UE starts in n+k1 subframe the trigger message detecting A-CSI, 0≤k1<t0.
18. methods according to claim 16, is characterized in that, the trigger message of the A-CSI on described PDCCH on the X of detected cells comprises: before the indication information receiving activation cell X, the A-CSI trigger message of UE detected cells X.
19. methods according to claim 18, is characterized in that, UE, after receiving the activation indication information of community X, this community X sends A-CSI report; Or after receiving the activation indication information of community X, then after postponing T ms, UE sends A-CSI report on the X of community, 0≤T<t0.
20. methods according to claim 16, is characterized in that, utilize the indication information of activation cell X to trigger the A-CSI report reporting of UE at community X.
21. methods according to claim 1, it is characterized in that, when the CSI information measurement of described UE is the measurement pattern based on CSI-RS, in the extra NZP CSI-RS divided in M subframe before after community X opens except the NZP CSI-RS except period allocated and CSI-IM resource being used in CSI measurement and CSI-IM resource, M<t0, t0 are a constant.
22. methods according to claim 21, it is characterized in that, when described UE is configured with two CSI subframe collection and reports the CSI information of corresponding subframe collection respectively, then to described two CSI subframe collection, configure described extra NZP CSI-RS and CSI-IM resource respectively.
23. method according to claim 21, is characterized in that, to TDD system, the front N that community X has just opened
1individual sub-frame of uplink, community X works in and strengthens interference coordination and service adaptation eIMTA pattern or carry out work according to descending sub frame; Wherein, N
1<t0.
24. methods according to claim 21, is characterized in that, described extra NZP CSI-RS and CSI-IM resource are implicit configurations, and the cycle NZP CSI-RS of multiplexing high-level signaling configuration and the RE resource distribution of CSI-IM resource; Or described extra NZP CSI-RS and CSI-IM resource are explicit configurations.
25. methods according to claim 21, is characterized in that, the mode of described explicit configuration is: be configured in high-level signaling NZP CSI-RS and the CSI-IM resource which subframe when community X just opens comprises additional configuration; Or, in the DL Grant sending to UE, increase the NZP CSI-RS of additional configuration and the indication information of CSI-IM resource; Or, while the X of activation cell, indicate the configuration information of extra CSI-RS and CSI-IM resource.
26. methods according to claim 21, is characterized in that, in the subframe at described extra NZP CSI-RS and CSI-IM resource place, indicate which RE not to be used for PDSCH transmission.
The terminal equipment of 27. 1 kinds of quick transmitting-receiving downlink datas and upstream data, it is characterized in that, this equipment comprises: DiS receives and down-going synchronous unit, the first channel status are measured and report unit, Stochastic accessing unit, second channel state measurement and report unit; Wherein,
Described DiS receives and down-going synchronous unit, for receiving DiS, and the CRS process down-going synchronous after opening according to DiS or according to DiS and community X;
Described first channel status is measured and reports unit, for measuring RSRP/RSRQ and/or the CSI information of community X based on DiS, and is reported to the Serving cell of work at present;
Described downlink information receiving element, for receiving PDCCH and PDSCH on the X of community;
Described Stochastic accessing unit, the trigger message of the random access procedure on the X of detected cells, and perform random access procedure;
Described second channel state measurement and report unit, for measuring and reporting CSI information to community X.
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| PCT/KR2015/000240 WO2015105378A1 (en) | 2014-01-09 | 2015-01-09 | Method and device for fast receiving and transmitting ul data and dl data |
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| WO2021057980A1 (en) * | 2019-09-27 | 2021-04-01 | 中兴通讯股份有限公司 | Information reporting and receiving methods, apparatus, terminal, service node, and storage medium |
| WO2021223052A1 (en) * | 2020-05-04 | 2021-11-11 | Qualcomm Incorporated | Early channel state information reporting in random access channel |
| CN115442196A (en) * | 2022-08-24 | 2022-12-06 | 成都中科微信息技术研究院有限公司 | Method for enhancing NR PRACH _ format _0 coverage capability |
| CN115442196B (en) * | 2022-08-24 | 2024-05-28 | 成都中科微信息技术研究院有限公司 | Method for enhancing NR PRACH_format_0 coverage capability |
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| WO2015105378A1 (en) | 2015-07-16 |
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