CN105553602B - The method and apparatus for sending/receiving reference signal in a wireless communication system - Google Patents

Abstract

The present invention relates to the method and apparatus for sending/receiving reference signal in a wireless communication system.For sending in a wireless communication system in the base station apparatus of reference signal, processor be distribute to each layer resource element (RE) generation identical scramble sequence, for reference signal transmission, and extend or cover Walsh (Walsh) code, so that it can be mutually orthogonal directions on a timeline for the scramble sequence of resource element generation, to generate reference signal sequence.Herein, based on multiple resource blocks (RB) or based on resource block to applying the walsh code extension or covering that are carried out by processor on the frequency axis, enabling mutually different sequence of the mapping with mutually different sequential value between resource block or between paired resource block.Via each layer, the reference signal that the reference signal sequence so generated is applied to is sent to user equipment by transport module.

Description

The method and apparatus for sending/receiving reference signal in a wireless communication system

The application be on April 27th, 2012 international filing date submitted be in September, 2010 Application No. of 7 days (201080048850.9 PCT/KR2010/006071's), entitled " transmission/reception reference in a wireless communication system The divisional application of the method and apparatus of signal " patent application.

Technical field

The present invention relates to a kind of wireless communication system, and relate more specifically to a kind of reference signal being used for using generation Sequence sends/received the method and apparatus of reference signal.

Background technology

Provide for 3GPP LTE (third generation partner program Long Term Evolutions；Hereinafter referred to as " LTE ") retouch State, using the example mobile communication system that can be applied to as the present invention.

Fig. 1 illustrates E-UMTS (evolved Universal Mobile Telecommunications System) network as example mobile communication system. E-UMTS be from UMTS (UMTS) evolution come system, and for E-UMTS basic standardization currently by 3GPP is performed.E-UMTS can be considered as LTE system.The details of UMTS and E-UMTS technical specification are respectively with reference to " the Third generation partnership project；The version 7 and version 8 of Radio Access Network technical specification group ".

With reference to figure 1, E-UMTS is including being located at the end of user equipment (UE), e nodes B and network (E-UTRAN) simultaneously And the access gateway (AG) linked with external network.E nodes B can simultaneously send for broadcast service, multicast service and/or Multiple data flows of unicast services.

One or more cells belong to an e nodes B.Cell is arranged to 1.25,2.5,5,10,15 and 20MHz's One in bandwidth, and provide downlink or uplink transmission services to multiple UE.Different cells, which can be configured, to be made Obtain them and different bandwidth are provided.Transmission of the e nodes B controls to multiple UE data and the reception to the data from multiple UE. By the way that the downlink schedule information about down link data is sent into UE, e nodes B will wherein down link data will be by Time domain/frequency domain of transmission, encoding scheme, information of size of data including hybrid automatic repeat-request (HARQ) etc. are sent out with signal It is sent to corresponding UE.

By the way that the uplink scheduling information about uplink data is sent into UE, e nodes B can be used by UE Time domain/frequency domain, encoding scheme, size of data including HARQ information etc. be sent to UE.Use can be used between e nodes B In customer flow or the interface of control flow transmission.Core net (CN) can be by AG and for UE user's registration network node To form.AG manages UE mobility based on the tracing area (TA) for being configured with multiple cells.

Although wireless communication technology is developed into LTE based on WCDMA (WCDMA), to The demand and expectation of family and common carrier are constantly increasing.In addition, wireless access technology constantly develops, and therefore need The evolution of technology is wanted to improve competitiveness.The evolution of technology includes the increasing in terms of the reduction of the cost per bit, service availability Add, the flexible use of frequency band, the interface of simple structure and opening, appropriate UE power consumptions etc..

Recently, 3GPP has been carried out the standardization of the technology for following LTE.This technology is claimed in this manual For " advanced LTE " or " LTE-A ".One of main distinction between LTE and LTE-A is system bandwidth.It is more that LTE-A is intended to support Up to 100MHz broadband.In order to realize this, carrier aggregation or bandwidth for using multiple frequency chunks to realize broadband have been used Polymerization.Multiple frequency chunks are used as a logic frequency band to obtain broader frequency band by carrier aggregation.It can be based on using in LTE System block bandwidth define the bandwidth of each frequency chunks.Each frequency chunks are sent using component carrier.

However, LTE-A is not discussed also when eight layers carry reference signal, generate and passed for the reference signal in each layer The method of defeated reference sequences.

The content of the invention

Technical problem

It is an object of the invention to provide a kind of method for being used to sending/receiving in a wireless communication system reference signal.

It is a further object of the present invention to provide a kind of dress for being used to sending/receiving in a wireless communication system reference signal Put.

Treat by present invention solves the technical problem that be not limited to above-mentioned technical problem, and from the following description, ability The technical staff in domain is it can be clearly understood that the other technical problems do not mentioned hereinbefore.

Technical solution

In terms of the present invention, a kind of method bag for being used to send reference signal at e nodes B in a wireless communication system Include：The pseudo-random sequence for each layer is generated using the first m-sequence and the second m-sequence；Use generated pseudorandom sequence Arrange with walsh code to generate reference signal sequence；And for each layer, the reference signal sequence that will be generated for each layer The reference signal being applied to is sent to user equipment (UE), wherein, pseudo-random sequence is generated using sequence initialization value, is made Generated with the timeslot number in radio frame, physical-layer cell ID values and instruction by the value of the layer index group of frequency separation The sequence initialization value.

In another aspect of this invention, in a wireless communication system at e nodes B send reference signal method bag Include：Resource element (RE) to distribute to each layer generates identical scramble sequence, for reference signal transmission；Pass through extension Or cover walsh code and generate reference signal sequence so that the scramble sequence for RE generations is orthogonal on a timeline 's；And the reference signal that the reference signal sequence generated is applied to is sent to UE via each layer, wherein, based on more Individual resource block (RB) or based on resource block to apply on the frequency axis the walsh code extension or covering so that have mutually not The mutually different sequence of same sequential value is mapped between resource block or between paired resource block.

In walsh code extends and covers, in the first resource block of multiple resource blocks pair, walsh code element can be with Applied to the first code division multiplexing (CDM) group so that the walsh code element arrives on the direction of the time shaft, by one-to-one mapping The RE of the first subcarrier of first resource block is distributed to, in the opposite direction of the time shaft, by one-to-one mapping to the second son The RE of carrier wave, and the RE on the direction of the time shaft, by one-to-one mapping to the 3rd subcarrier, and in multiple resource blocks To Secondary resource block in, the walsh code element goes for the first CDM groups so that the walsh code element is in the time RE in the opposite direction of axle, by one-to-one mapping to the first subcarrier for distributing to Secondary resource block, in the side of the time shaft Upwards, the RE by one-to-one mapping to the second subcarrier, and in the opposite direction of the time shaft, by one-to-one mapping to The RE of three subcarriers.

In the first and second resource block pairs, the walsh code element can with the Walsh suitable for the first CDM groups The different order of the order of data code and be applied to the 2nd CDM groups.

, can be on the frequency axis based on two resource blocks to different repeatedly to have in the generation of reference signal sequence The different sequences of sequential value.

The walsh code element of CDM groups can be used as (1,1,1,1) and be applied to layer 1, be applied as (1, -1,1, -1) In layer 2, it is applied to layer 3 as (1,1, -1, -1), and is applied to layer 4 as (1, -1, -1,1).

In another aspect of this invention, include for sending the e Node-B devices of reference signal in a wireless communication system： Processor, the processor generates the pseudo-random sequence for each layer using the first m-sequence and the second m-sequence, and makes Reference signal sequence is generated with the pseudo-random sequence and walsh code that are generated；And transport module, the transport module pin To each layer, the reference signal that the reference signal sequence generated for each layer has been applied to is sent to UE, wherein, at this Reason device generate the pseudo-random sequence using sequence initialization value, using the timeslot number in radio frame, physical-layer cell ID values, And instruction generates the sequence initialization value by the value of the layer index group of frequency separation.

In another aspect of this invention, include for sending the e Node-B devices of reference signal in a wireless communication system： Processor, the processor be distribute to each layer resource element (RE) generation identical scramble sequence, for reference to believe Number transmission, and generates reference signal sequence so that for the scramble sequence of RE generations by extending or covering walsh code It is mutually orthogonal directions on a timeline；And transport module, the reference signal that the transport module will be generated via each layer The reference signal that sequence has been applied to is sent to UE, wherein, the walsh code extension or covering of the processor are based on multiple moneys Source block (RB) is employed on the frequency axis based on resource block pair so that has the mutually different of mutually different sequential value Sequence is mapped between resource block or between paired resource block.

Beneficial effect

3GPP LTE- can be significantly improved according to the method for being used to generate and send reference signal sequence of the present invention The communication performance of e nodes B and UE in A systems.

It should be appreciated that the foregoing general description of the present invention and to the following specifically describes all be exemplary and explanatory , and aim to provide and of the invention be explained further to as claimed in claim.

Brief description of the drawings

Be included to provide a further understanding of the present invention and be merged in here form the application a part it is attached Embodiments of the invention are illustrated, and for explaining principle of the invention together with explanation.In the accompanying drawings：

Fig. 1 illustrates the E-UMTS networks as example mobile communication system；

The control that Fig. 2 illustrates the Radio interface protocols between UE and E-UTRAN based on 3GPP Radio Access Networks is put down Face and the structure of user plane；

Fig. 3 be with to the physical channel used in a 3 gpp system and the universal signal transmission method for using the physical channel The figure of the description correlation carried out；

Fig. 4 illustrates the exemplary radio frame knot used in the 3GPP LTE systems for one of GSM Structure；

Fig. 5 illustrates the downlink and uplink subframe structure of 3GPP LTE systems；

Fig. 6 illustrates running time-frequency resource grid (grid) structure for the downlink in 3GPP LTE systems；

Fig. 7 illustrates the modeling of multiple-input and multiple-output (MIMO) communication system；

Fig. 8 illustrates N_TIndividual T_XAntenna and R_XChannel between antenna i；

Fig. 9 illustrates the general framework for SC-FDMA and OFDMA；

Figure 10 illustrates the example uplink SC-FDMA system architectures for 3GPP LTE systems；

Figure 11 illustrates the example uplink SC-FDMA transmission frame structure for 3GPP LTE systems；

Figure 12 illustrates the example of the data-signal mapping relations for the mimo system based on SC-FDMA；

Figure 13 illustrates the example reference signal pattern for 3GPP LTE systems；

Figure 14 is illustrated in RB as the exemplary RE patterns of the coded multiplexing of DRS layers 1 and 2；

Figure 15 illustrates the illustrative methods for generating DRS sequences；

Figure 16 illustrates the illustrative methods for generating DRS sequences；

Figure 17 illustrates the illustrative methods for generating DRS sequences；

Figure 18 illustrates the illustrative methods for the formation sequence in RB；

Figure 19 illustrates the illustrative methods for generating DRS sequences；

Figure 20 illustrates the illustrative methods for the formation sequence in RB；

Figure 21 illustrates the illustrative methods for generating DRS sequences in RB；

Figure 22 is illustrated in the case of two cells, for sending DRS illustrative methods using DRS sequences；

Figure 23 illustrates the illustrative methods for the formation sequence in RB；

Figure 24 illustrates the illustrative methods for being used for that DRS is sent using DRS sequences in the case of two cells；

Figure 25 is illustrated precoding being applied to two DRS layers, DRS layers are mapped to four Tx antennas and send DRS The illustrative methods of layer, and the power difference when sending DRS using this method between OFDM symbol；

Figure 26 illustrates the illustrative methods for generating DRS sequences；

Figure 27 illustrates the exemplary side for sending DRS using the DRS sequences generated according to the method shown in Figure 26 Method；

Figure 28 (a) and 28 (b) illustrate the illustrative methods for generating DRS sequences；

Figure 29 (a) and 29 (b) illustrate the illustrative methods for generating DRS sequences；

Figure 30 illustrates the example for sending DRS signals using DRS sequences in the case of two cells；

Figure 31 illustrates the alternative of the DRS sequence generating methods shown in Figure 26；

Figure 32 (a) and 32 (b) illustrate the illustrative methods for generating DRS sequences for each OFDM symbol；

Figure 33 illustrates the sequence mapping method relevant with the method shown in Figure 32 (a) and 32 (b)；

Figure 34 (a) illustrates the exemplary orthogonal code overlay code pattern for specific DRS layers；

Figure 34 (b) and 34 (c) illustrate the example for using walsh code in RB；

Figure 35 illustrates the illustrative methods for mapping walsh code in frequency CDM RE set；

Figure 36 (a) and 36 (b) illustrate the example of the frame hopping for two layers；

Figure 37 illustrates the example of the frame hopping for two layers；

Figure 38 (a) and 38 (b) illustrate the example of the frame hopping for four layers；

Figure 39 illustrates the illustrative methods for generating two sequences；

Figure 40 illustrates the example for sending DRS using DRS sequences in the case of two cells；

Figure 41 illustrates the example for sending DRS using DRS sequences in the case of two cells；

Figure 42 illustrates the example for sending DRS using DRS sequences in the case of two cells；

Figure 43 (a) illustrates the example that DRS is sent using the DRS sequences of generation；

Figure 43 (b) illustrates the transmit power according to the transmission plan shown in Figure 43 (a)；

Figure 44 illustrates the example that DRS is sent using the DRS sequences of generation；

Figure 45 is illustrated for by the illustrative methods of each layer of CDM code division dispensings；

Figure 46 (a) illustrates the example for sending DM RS sequences；

Figure 46 (b) illustrates the transmit power of the transmission plan according to Figure 46 (a)；

Figure 47 illustrates exemplary DRS sequence mapping methods；

Figure 48 illustrates the example that DRS is sent using the DRS sequences of generation；

Figure 49 is illustrated using the illustrative methods that walsh code is applied to DM RS；

Figure 50 and 51 illustrates the illustrative methods that walsh code is applied to four DM RS；

Figure 52 illustrates exemplary DM RS sequence mapping methods；And

Figure 53 is the block diagram of devices in accordance with embodiments of the present invention 50.

Embodiment

The preferred embodiments of the present invention are carried out with detailed reference referring now to accompanying drawing.Refer to the attached drawing, will hereinafter The specific descriptions provided are intended to explain the exemplary embodiment of the present invention, rather than are intended to show that and can be realized according to the present invention Only embodiment.Although for example, the following specifically describes including specific detail so as to provide the present invention complete understanding, To those skilled in the art it is evident that this can be realized in the case of not such specific detail Invention.For example, it is assumed that just using the situation of third generation partner program Long Term Evolution (3GPP LTE) GSM Under give and the following specifically describes.However, in addition to the intrinsic special characteristic of 3GPP LTE systems, description is applied to any other GSM.

In some cases, it is known that structure and equipment be omitted, or to concentrate on the important feature of structure and equipment Block diagram form known structure and equipment be shown, so as not to obscure idea of the invention.In this specification, Identical reference will be used to refer to same or similar part.

In the following description, user equipment (UE) is assumed to refer to such as movement station (MS), advanced movement station Etc. (AMS) mobile or fixed subscriber terminal equipment, and term " base station (BS) " is assumed to be and refers to what is communicated with UE Any node of the network terminal of Node B, the node B (eNB or e node B) of enhancing, access point (AP) etc..

In mobile communication system, UE can be on the uplink from e Node-B receiver information, and on uplink It will send information to e nodes B.The information that MS sends or received includes data and various types of control information.Sent according to MS Or there are many physical channels in the type and purposes of the information received.

Technology, device and system described herein can be used in various wireless access technologys, such as code Divide multiple access (CDMA), time division multiple acess (TDMA), OFDM (OFDMA), single-carrier frequency division multiple access (SC-FDMA) etc.. CDMA can be realized using such as universal terrestrial radio access (UTRA) or CDMA 2000 radiotechnics.TDMA It can be drilled using such as global system for mobile communications (GSM)/GPRS (GPRS)/enhanced data rates for gsm Enter the radiotechnics of (EDGE) to realize.OFDMA can use such as electronics and the Institution of Electrical Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, UTRA (E-UTRA) etc. the wireless technology of evolution are realized. UTRA is UMTS (UMTS) part.Third generation partner program (3GPP) Long Term Evolution (LTE) is Use E-UTRA evolved UMTS (E-UMTS) part.3GPP LTE use OFDMA in the downlink, and upper SC-FDMA is used in line link.Advanced LTE (LTE-A) is 3GPP LTE evolution.

For clarity, the present invention concentrates on 3GPP LTE/LTE-A.However, the technical characteristic not limited to this of the present invention.

The control that Fig. 2 illustrates the Radio interface protocols between UE and E-UTRAN based on 3GPP Radio Access Networks is put down Face and the structure of user plane.

With reference to figure 2, control plane is to be sent for UE's 120 by it and disappeared for managing the network-based control called The path of breath.User plane is the data in application layer generation, i.e. voice data, internet packet data etc. pass through the logical of its Road.

Physical layer, i.e. first layer provides information transfer service using physical channel to higher layer.Physical layer passes through transmission Channel, and the medium plan corresponding with higher layer (MAC) layer link.By transmitting channel come in MAC layer and physics Data are sent between layer.Data are sent via the physical channel between emitter and the physical layer of receiver.Physical layer by when Between and frequency be used as Radio Resource.Specifically, physical layer is adjusted by OFDM (OFDMA) in the downlink System, and modulated in the uplink using single-carrier frequency division multiple access (SC-FDMA).

The MAC layer corresponding with the second layer is by logic channel, to the wireless spread-spectrum technology corresponding with higher layer (RLC) layer provides service.Rlc layer supports reliable data transfer.The function of rlc layer may be implemented as the function in MAC layer Block.Packet data convergence protocol (PDCP) layer of the second layer is performed for being reduced using narrow bandwidth in wave point to such as The header suppression function of the unnecessary control information of efficient transmission of IPv4 or IPv6 IP packets.

Wireless heterogeneous networks (RRC) layer corresponding with the lowermost layer of third layer only defines in the control plane.Rrc layer control The configuration with radio bearer is made, reconfigures and discharges associated logic channel, transmit channel and physical channel.Nothing Line carrying means the service that the data transfer between UE and network is provided by the second layer.For this, the RRC of UE and network Layer exchanges RRC information.When UE is that RRC is connected with the rrc layer of network, UE is in RRC connection modes, and when they are not It is in during RRC connections in idle pulley.Non-access rank (NAS) layer corresponding with the higher layer of rrc layer performs session management And mobile management.

Composition e nodes B 110 cell is arranged to one in 1.25,2.5,5,10,15 and 20MHz bandwidth It is individual, and provide downlink or uplink transmission services to UE.Different cells may be configured to provide different bands It is wide.

Downlink transport channel for data to be sent to UE from network includes the broadcast channel of bearing system information (BCH), the downlink sharied signal channel of the PCH (PCH) of bearing call message, transmission customer flow or control message (SCH) etc..The flow or control message of Downlink multicast or broadcast service can be by downlink SCH or by independent Downlink Multicast Channel (MCH) send.Uplink transfer channel for data to be sent to network from UE includes Send the RACH (RACH) and the shared letter of the up-link of carrying customer flow or control message of initial control message Road (SCH).Include BCCH positioned at the logic channel for transmitting on channel and be mapped to the transmission channel (BCCH), Paging Control Channel (PCCH), public control channel (CCCH), multicast control channel (MCCH), multicast traffic channel (MTCH) etc..

Fig. 3 illustrates the physical channel used in 3GPP system and using the universal signal transmission method of physical channel.

With reference to figure 3, when electricity on UE or the new cell of entrance, UE execution includes and e nodes B synchronous acquisition Search of initial zone (S310).For search of initial zone, the UE from e Node-B receivers primary synchronization channel (P-SCH) and time Synchronizing channel (S-SCH), and obtain such as cell ID (ID) synchronous with e nodes B's and from P-SCH and S-SCH Information.Then UE can obtain the broadcast message in cell from e Node-B receivers Physical Broadcast Channel (PBCH) and from PBCH. In search of initial zone step, UE can check downlink channel by receiving downlink reference signal (DL RS) State.

After search of initial zone is completed, UE can be by according to the information carried on PDCCH, receiving physical down Link control channel (PDCCH) and receive physical down link sharing channel (PDSCH) and obtain more particular system information (S320)。

Then, UE can perform random access procedure (S330 to S360) to be accomplished to BS access.It is random for this Access procedure, UE can send leading (S330 and S350) on Physical Random Access Channel (PRACH), and corresponding thereto Received on the PDCCH and PDSCH answered to the leading response message (S340 and S360).If random access procedure is to be based on striving , then UE can extraly perform contention resolution process.

After above-mentioned random access procedure, UE can connect in general uplink/downlink signals transmission Receive PDCCH/PDSCH (S370) and send physical uplink link shared channels (PUSCH)/physical uplink control channel (PUCCH)(S380).The control information that UE is sent to e nodes B includes downlink/uplink affirmative acknowledgement/negative-ACK (ACK/NACK) signal, channel quality instruction (CQI), pre-coding matrix index (PMI) and order instruction (RI).In 3GPP In the case of LTE system, UE can send such as CQI/PMI/RI control information by PUSCH and/or PUCCH.

Fig. 4 illustrates the exemplary radio frame knot used in the 3GPP LTE systems as one of GSM Structure.

With reference to figure 4, radio frame has 10ms (327200T_s) length and including 10 subframes.Each subframe tool There is 1ms length and including two time slots.Each time slot has 0.5ms (15360T_s) length.Herein, T_sExpression is adopted The sample time, and it is represented as T_s=1/ (15kHz × 2048)=3.2552 × 10^-8(about 33ns).One time slot includes more Multiple resource blocks in individual OFDM symbol or SC-FDMA symbols and frequency domain.

In LTE, a resource block includes 12 subcarrier × 7 (6) OFDM symbols or SC-FDMA symbols.As for The Transmission Time Interval (TTI) of the unit interval of data transfer can be configured using one or more subframes.Radio is shown The purpose of the being given for example only property of structure of frame.Therefore, the time slot that the number for the subframe that radio frame includes or subframe include Number or the OFDM symbol that includes of time slot or the number of SC-FDMA symbols can change in a variety of ways.

Fig. 5 illustrates the downlink and UL subframe for the 3GPP LTE systems as one of GSM The structure of frame.

With reference to figure 5 (a), downlink subframe includes two time slots in the time domain.First in downlink subframe Most three OFDM symbols in the forward part of time slot correspond to the control zone to be dispensed for having control channel.Remaining OFDM symbols Number correspond to the data field to be dispensed for having physical down link sharing channel (PDSCH).

The example of the downlink control channel used in 3GPP LTE includes Physical Control Format Indicator Channel (PCFICH), physical downlink control channel (PDCCH), physical mixed-ARQ instruction channels etc..PCFICH in subframe Sent at one OFDM symbol and carry the number of the OFDM symbol about the transmission for the control channel in subframe (i.e., The size of control zone) information.Down link control information (DCI) is referred to as by the PDCCH control information sent.DCI bags Include and send (Tx) work(for the uplink resource allocation information, downlink resource allocations information, up-link of any UE groups Rate control command etc..PHICH carries affirmative acknowledgement (ACK)/negative response for up-link mixed automatic retransfer (HARQ) (NACK) signal.That is, PHICH is carried in response to the ack/nack signal of the uplink data sent by UE.

PDCCH description will be provided.

PDCCH can carry PDSCH resource allocation and transformat (DL licenses), PUSCH resource allocation information (UL License), the activation etc. of one group of Tx power control command about the individual UE in any UE groups, voice-over ip (VoIP). Multiple PDCCH can be sent in control zone.UE can monitor multiple PDCCH.PDCCH uses one or several continuous controls The polymerization of channel element (CCE) configures, and can be sent after experience sub-block is interlocked by control zone.CCE is to use To provide the assignment of logical unit of code rate to PDCCH based on the state of radio channel.CCE corresponds to multiple resource elements Group.The number of PDCCH form and PDCHH available bits is by between the quantity according to CCE and the code rate by CCE offers Correlation determine.

The control information sent on PDCCH is referred to as DCI.Table 1 shows the DCI according to DCI format.

[table 1]

DCI format 0 corresponds to uplink resource allocation information, DCI format 1 and DCI format 2 corresponding to downlink point With information, and DCI format 3 and DCI format 3A corresponds to the up-link transmission power control command about any UE groups.

With reference to figure 5 (b), uplink sub-frames can be divided into control zone and data field in a frequency domain.Control zone is distributed Have for carrying the physical uplink control channel of uplink control information (PUCCH).Data separation, which is furnished with, to be used to carry The physical uplink link shared channels (PUSCH) of user data.In order to maintain single carrier property, a UE is not sent simultaneously PUCCH and PUSCH.PUCCH for a UE is assigned to RB pairs in subframe.Belong to RB couples of the RB and take corresponding two Different subcarriers in individual time slot.PUCCH RB is distributed to being frequency hopping on the slot boundary.

Fig. 6 illustrates the running time-frequency resource for the downlink in the 3GPP LTE systems as one of GSM Lattice structure.

With reference to figure 6, the down link signal sent in each time slot can by includingIndividual subcarrier andThe resource grid of individual OFDM symbol describes.Herein,The number of the RB in DL time slots is represented, andRepresent Form the number of RB subcarrier.Represent the number of the OFDM symbol in downlink time slots.Depending on small The downlink transmission bandwidth in area and it must is fulfilled forHerein,Represent by wireless The minimum downlink bandwidth that communication system is supported, andRepresent the maximum downstream chain supported by wireless communication system Road bandwidth.AlthoughAndBut their not limited to this.The OFDM symbols included in one time slot Number number can depend on cyclic prefix (CP) length and subcarrier spacing., can be each in the case of multi-antenna transmission Antenna port defines a resource grid.

For each resource element (RE) in the resource grid of each antenna port can by the index in time slot to (k, L) uniquely identify.Herein, k is that frequency domain is indexed and hadValue in a value, and l is When Domain Index and with 0 ...,Value in one value.

RB shown in Fig. 6 is used to describe the mapping relations between particular physical channel and RE.RB can be divided into Physical Resource Block (PRB) and virtual resource blocks (VRB).

PRB is defined as in time domainIn individual continuous OFDM symbol and frequency domainIndividual continuous subcarrier.WithIt can be predefined value.For example,WithIt can be provided by shown in table 2.Therefore, one PRB includesIndividual RE.The time slot that one PRB can correspond in time domain, and correspond to 180kHz, but PRB Not limited to this.

[table 2]

PRB have in frequency domain scope from 0 toValue.PRB numbers n in frequency domain in a time slot_PRBWith RE (k, L) relation between meets

VRB and PRB has identical size.VRB can be divided into local VRB (LVRB) and virtual reality B (DVRB).For the VRB of each type, single VRB numbers n_VRBOne be assigned in two time slots in a subframe To VRB.In other words, first time slot belonged in two time slots for forming a subframeVRB be assigned 0 toIndex in an index, and the second time slot belonged in two time slotsVRB is also assignedIt is individual An index in index.

The description of MIMO technology will be provided.MIMO technology is the abbreviation of MIMO technique.MIMO technology uses more It is individual to transmit (Tx) antenna and multiple reception (Rx) antennas to improve the efficiency of Tx/Rx data, on the contrary previously conventional technique was general Use single Tx antennas and single Rx antennas.In other words, MIMO technology allows the transmission end or receiving terminal of wireless communication system Use multiple antennas, enabling improve capacity or performance.For convenience of description, term " MIMO " can also be considered as more Antenna technology.

In more detail, MIMO technology receives single total message not against individual antenna path, and it is collected via some days Multiple data slices that line receives, and make it that total message is complete.Therefore, the data that MIMO technology can be improved in particular range pass Defeated speed, or can increase with the system scope of particular data transmission speed.

The data transmission higher than the data transfer rate of normal mobile communication technology of next generation mobile communication technical requirements Speed, enabling it is essential for next generation mobile communication technology to be contemplated that effective MIMO technology.At this Under individual hypothesis, the MIMO communication technologys are the next generation mobile communication technologies to be applied to mobile communication terminal or repeater, and It is capable of the scope of extended data communication scope so that it can overcome other movements caused by various limited situations The limited amount of the transmission data of communication system.

Meanwhile come self energy improve data transmission efficiency various technologies among MIMO technology can greatly improve it is logical Believe the amount and Tx/Rx performances of capacity, and without distributing extra frequency or increasing extra power.Due to these technological merits, This MIMO technology is given and greatly paid close attention in the region of most of companies or developer.

Fig. 7 illustrates general MIMO communication system.

With reference to figure 7, if the number of Tx antennas increases to N_T, while the number of Rx antennas increases to N_R, then MIMO lead to The paper channel transmission capacity of letter system and the number of antenna proportionally increase, and make different from wherein only emitter or receiver If with the above situation of dry aerial so that transfer rate and frequency efficiency can greatly increase.In this case, increasing is passed through The transmission capacity that adds and the transfer rate that obtains is equal to acquired maximum transfer rate (Ro) when using individual antenna With the product of rate increment (Ri), and can increase in theory.Rate increment (Ri) can be represented by equation 1 below：

[equation 1]

R_i=min (N_T,N_R)

The mathematical modeling of the communication means for being used in above-mentioned mimo system will be described in detail herein below.

First, if from seen in fig. 7, it is assumed that N be present_TIndividual Tx antennas and N_RIndividual Rx antennas.

In the case of Tx signals, N is being used_TThe maximum number that message slot is transmitted under conditions of individual Tx antennas is N_TSo that Tx signals can be represented by the specific vector shown in equation 2 below：

[equation 2]

Meanwhile individually transmit message slot s₁、s₂、…、S_NTThere can be different transimission powers.In this case, If single transimission power passes through p₁、p₂、…、p_NTTo represent, then the transmission information with the transimission power of adjustment can lead to The specific vector shown in equation 3 below is crossed to represent.

[equation 3]

In equation 3,It is the diagonal matrix of transimission power, and can be represented by equation 4 below.

[equation 4]

The information vector of transimission power with adjustment is multiplied by weight matrix W so that treats the N actually sent_TIndividual biography Defeated (Tx) signal x₁、x₂、…、x_NTIt is configured.In this case, weight matrix is applied to appropriate according to transmission channel situation Ground is distributed to information is transmitted on single antenna.Said transmission signal x₁、x₂、…、x_NTCan be by using the following of vector x Equation 5 represents.

[equation 5]

In equation 5, w_ijIt is the weight between i-th of Tx antenna and j-th of Tx information, and W is to indicate the weight Matrix.Matrix W is referred to as weight matrix or pre-coding matrix.

Meanwhile, it is capable to consider above-mentioned Tx signals (x) by different way according to two kinds of situations, i.e. wherein using space point The first situation of collection and second of situation for wherein using spatial reuse.

In the case of using spatial reuse, different signals is re-used and the signal through multiplexing is sent to purpose Ground so that information vector s element has different values.Otherwise, in the case of using space diversity, identical signal is passed through Repeatedly sent by some channel paths so that information vector s element has identical value.

Needless to say, it is also contemplated that the combination of spatial multiplex scheme and space diversity scheme.In other words, according to space point Collection scheme, identical signal is sent via three Tx antennas, and remaining signal is spatially multiplexed and is subsequently sent to mesh Ground.If next, use N_RThe Rx signals y of individual Rx antennas, then single antenna₁、y₂、...、y_NRCan be by such as the following Specific vector y shown in formula 6 is represented.

[equation 6]

When being modeled in mimo wireless communication system to channel, can be distinguished according to the index of Tx and Rx antennas They.Channel between j-th of Tx antenna and i-th of Rx antenna passes through h_ijTo represent.It is interesting to note that in h_ijMiddle Rx antennas Index before the index of Tx antennas.Channel can be universally expressed as vector or matrix.Describe vector representation Example.

Fig. 8 is illustrated from N_TIndividual Tx antennas to i-th of Rx antenna channel.

As shown in Figure 8, from N_TThe channel of individual Tx antennas to i-th of Rx antenna can be represented by equation 7 below.

[equation 7]

Therefore, from N_TIndividual Tx antennas are to N_RAll channels of individual Rx antennas can be represented by equation 8 below.

[equation 8]

Actual channel undergoes above-mentioned channel matrix H, and is then added with additive Gaussian type white noise (AWGN).It is added to N_RThe AWGN of individual Rx antennasIt is given following vector.

[equation 9]

According to above-mentioned mathematical modeling, received signal vector is given：

[equation 10]

Represent that the number of the row and column in the channel matrix H of channel status is determined by the number according to Rx and Tx antennas. Specifically, the number of the row in channel matrix H is equal to the number N of Rx antennas_R, and the number of the row in channel matrix H is equal to Tx The quantity N of antenna_T.Therefore, channel matrix H is N_R×N_TSize.

Rank of matrix is defined as the smaller between the number of the uncorrelated row in the matrix and the number of uncorrelated row. Therefore, number of the rank of matrix no more than the row or column of the matrix.The order rank (H) of channel matrix H meets following constrain.

[equation 11]

rank(H)≤min(N_T, N_R)

On the other hand, it is able to observe that the attribute of pre-coding matrix.Do not consider that the channel matrix H of pre-coding matrix can Represented by equation 12 below.

[equation 12]

If in general, provided least mean-square error (MMSE) receiver, k-th of signal received and interference Noise ratio (STNR) ρ_kIt is defined as equation 13.

[equation 13]

However, it is reflected in the efficient channel on pre-coding matrixH can carry out table by using the W shown in equation 14 Show.

[equation 14]

Thus, it is supposed that MMSE receivers have been used, k-th of SNIR ρ effectively received_kIt is defined as equation 15 below.

[equation 15]

Herein, theoretical background can be based on, is observed according to the change of pre-coding matrix about the SINR that receives Some effectiveness.First, the effectiveness of the column permutation in a pre-coding matrix can be verified.In other words, in i-th of row Vectorial w_iWith j-th of column vector w_jBetween displacement in the case of, the pre-coding matrix through displacementBelow equation can be passed through 16 represent.

[equation 16]

Therefore, there is pre-coding matrix W efficient channelWith with precoding squareThe efficient channel replaced of battle arrayIt can be represented respectively by equation 17.

[equation 17]

According to equation 17, even if having replaced two column vectors, the SINR value received is not changed in addition to order in itself, Allow channel capacity/and speed be constant.Therefore equation 14 and 15 is similar to, the efficient channel through displacement can be obtained With k-th of SINR received.

[equation 18]

[equation 19]

According to equation 19, it is noted that interference and noise section are equal to each other, as shown in equation 20：

[equation 20]

Recently received SINRIt can be represented by equation 2 below 1.

[equation 21]

Secondly, can be to by e^-jθThe effectiveness for the specific column vector that (0≤θ≤2 π) is multiplexed into a pre-coding matrix is entered Row verification.Simply, ± 1, ± j can be the possible values such as some examples.

E wherein^-jθIt is multiplexed to k-th rowIt can be represented by equation 2 below 2.

[equation 22]

Herein, the SINR receivedIt can be represented by equation 2 below 3.

[equation 23]

As equation 23 as a result, it is possible to it was observed that, only by e^-jθThe specific column vector being multiplexed into pre-coding matrix It is useless in terms of SINR and channel capacity/and speed is received.

Fig. 9 illustrates the general-purpose system structure for OFDMA and SC-FDMA.

In the general mimo antenna system based on OFDM or SC-FDMA, data-signal is in transmission symbol by complexity Mapping relations.First, data to be sent are divided into code word.For most applications, code word would be equivalent to by matchmaker Transmission block given by body Access Control (MAC) layer.Each code word is encoded using such as Turbo or the channel of tail-biting convolutional code is compiled Code device individually encodes.After coding, code word is to match the speed of appropriate size, and is then mapped to layer.It is right For SC-FDMA transmission, discrete Fourier transform (DFT) precoding is completed for each layer, and for OFDM transmission For do not apply DFT transform as shown in Figure 9.

Therefore, the signal of the DFT transform in each layer is multiplied by precoding vector/matrix, and is mapped to Tx antenna ends Mouthful.Pay attention to, Tx antenna ports can be a port for being mapped to actual physics antenna again by antenna virtualization.

The general cubic metric (CM) of single-carrier signal (such as SC-FDMA transmission signal) is more much lower than multi-carrier signal. This generic concept is also identical for papr (PAPR).Both CM and PAPR and emitter power amplifier (PA) dynamic range that must be supported is relevant.Under identical PA, with relatively low CM or PAPR and then with some other forms Any transmission signal of signal can be sent with higher transmit power.On the contrary, if PA peak power is fixed, And emitter is wanted to send high CM or PAPR signals, then it must reduce the transmit power for being slightly more than low CM signals.Why It is in multi-carrier signal that single-carrier signal, which has the reason for CM lower than multi-carrier signal, and the signal of multiple quantity is overlapping And the same phase for occasionally resulting in signal is added.This possibility can produce big signal amplitude.Here it is why OFDM systems System has the reason for big PAPR or CM values.

If the signal y finally obtained is only by signal code x₁Composition, then this signal is considered such as y=x₁ Single-carrier signal.But if the signal y finally obtained is by multiple signal code x₁、x₂、x₃、…、x_NComposition, then signal can To be considered as such as y=x₁+x₂+x₃+…+x_NMulti-carrier signal.PAPR or CM with coherently together with add and finally obtaining Signal waveform in signal code number it is proportional, but after certain amount of information symbol, the value tends to saturation. So if the signal waveform finally obtained is produced by a small amount of addition of single-carrier signal, then CM or PAPR will compare multi-carrier signal Much less, but slightly higher than pure single-carrier signal.

Figure 10 illustrates the example uplink SC-FDMA system architectures for 3GPP LTE systems, and Figure 11 figures The example uplink SC-FDMA transmission frame structure for 3GPP LTE systems is shown.

In version 8LTE systems, employ system architecture and transmission frame for uplink SC-FDMA, such as Figure 10 and Shown in Figure 11.BTU Basic Transmission Unit is a subframe.Two time slots form a subframe, and depending on cyclic prefix is matched somebody with somebody Put (for example, the normal CP or CP of extension), the number of the SC-FDMA in time slot is 7 or 6.Exist in each time slot at least One reference signal SC-FDMA symbol, it is not used for data transfer.Multiple subcarriers be present in single SC-FDMA symbols. Resource element (RE) is the composite information symbol for being mapped to single sub-carrier.In the case of using DFT transform precoding, due to DFT transform size and the number of the subcarrier used in the transmission are identicals for SC-FDMA, so RE is to be mapped to DFT The single information symbol of manipulative indexing.

In lte-a system, transmitted for up-link, it is contemplated that up to four layers of spatial reuse.In up-link list In user's space multiplexing, up to two transmission can be sent from scheduled terminal in the subframe of every uplink component carrier Block.Depending on the number of transport layer, identical principle, the teaching with transmission block are multiplexed according to version 8LTE downlink spatials Associated modulation symbol is mapped on one or two layer.In addition, in the case where lacking or Existential Space being multiplexed, DFT The OFDM of precoding is adopted to the Multiple Access scheme for uplink data transmission.In the case of multiple component carriers, often A DFT be present in component carrier.In LTE-A, specifically, support that frequency is continuous and frequency is non-on each component carrier Continuous both resource allocations.

Figure 12 illustrates the example of the data-signal mapping relations for the mimo system based on SC-FDMA.

If the number of code word is N_cAnd the number of layer is N_L, then N_cThe information symbol of individual quantity, or multiple N_cNumber Information symbol will be mapped to that N_LThe symbol of individual quantity or multiple N_L.DFT transform precoding for SC-FDMA does not change layer Size.When performing precoding to layer, the number of information symbol will pass through N_TWith N_LMatrix multiplication is from N_LChange to N_T.It is generally empty Between the transmission " order " of data that is multiplexed be equal to the quantity for the layer that data are transmitted within given transmission moment (in Figure 12 example N_L)。

In order to which the communication system in future supports such as 1Gbps extremely high data rate, it is necessary to support such as data of order 8 biography Defeated higher order data transfer.The information being multiplexed for the space layer for treating correctly to be sent and received is, it is necessary to for adjusting The reference signal sequence of the good design of system and channel estimation.Consider control signal arrangement and measure its required for rear IE Its reference signal, the reference signal sequence for the data message design of space layer multiplexing are complicated and difficult.The present invention It is proposed a kind of method that DRS (Dedicated Reference Signal) sequence is inserted in the RB comprising data message.

In such as LTE particular communications system, for the reference signal (RS) of data demodulation and for multiple space layers Channel estimation can be inserted in the RE in subframe as shown in Figure 13.

By provide it is being sent between the emitter in GSM and receiver and and receive RS description.

In a wireless communication system, when packet (or signal) is sent to receiver from emitter, it is contemplated that wireless The property of radio channel, being grouped during the transmission may distortion.In order to be successfully received the signal, receiver should be believed using channel The distortion of the received signal of breath compensation.In order to enable a receiver to obtain channel information, emitter send to emitter and The all known signal of both receivers, and receiver obtains channel based on the distortion of the signal received over a radio channel The knowledge of information.This signal is referred to as reference signal or pilot signal.

For from the packet of transmitted from transmitter to receiver transmission, single Tx antennas and single Rx days are generally used for Line.However, most of nearest GSMs improve transmission and connect by using multiple Tx antennas or multiple Rx antennas Receive data efficiency.Data are being transmitted and are receiving by multiple antennas, in the emitter of GSM or reception In the case of the purpose that capacity increase and communication performance at machine improve, reference signal exists for each Tx antennas.Receiver The signal sent from each Tx antennas can be successfully received using the reference signal for each Tx antennas.

In mobile communication system, two are mainly categorized as according to their purposes, reference signal.Reference signal bag Include the reference signal for channel information acquisition, and the reference signal for data demodulation.Because the former is used for UE, to obtain To the channel information of downlink, so its needs is sent in broadband, and even by under the reception not in specific sub-frame The UE of uplink data is received and measured.In addition, this reference signal for channel measurement can be used for handover measurement. When e nodes B sends down link signal, the latter with the e nodes B of corresponding resource by sending.UE can be by connecing This reference signal is received to perform channel estimation and data demodulation.Reference signal for data demodulation needs to send number wherein According to area in send.

Version 8LTE systems as one of GSM define two kinds of for the descending of unicast services Link reference signal, i.e. for the public RS (CRS) for the information for obtaining the measurement on channel status and switching, and for counting According to the special RS (DRS) (corresponding to UE DRS (Dedicated Reference Signal)s) of demodulation.In version 8LTE systems, the special RS of UE are only used for counting According to demodulation, and CRS is used for both channel information acquisition and data demodulation.CRS is the specific reference signal of cell, and e is saved Point B sends the CRC for each subframe by broadband.CRS was by most four days of the number for the Tx antennas according to e nodes B Line end mouth is sent.For example, when the number of e nodes B Tx antennas is 2, the CRS for antenna port #0 and #1 is sent；Instead When e nodes B Tx antennas number be 4 when, send the CRS for antenna port #0 and #3.

Figure 13 (a), 13 (b) and 13 (c) illustrate the exemplary RS patterns for 3GPP LTE systems.

Figure 13 (a), 13 (b) and 13 (c) show that the RS in a RB is laid out.In the RB, there may be for not With purpose and multiple RS for sending.Common reference signal (CRS) shown in Figure 13 is cell common reference signal, its by across More whole system bandwidth is sent.CRS can be used for the demodulation of data transfer, channel estimation, channel tracking, cell detection and Extra purpose.DRS (Dedicated Reference Signal) (DRS) can be used to the reference signal of data demodulation, and its only wherein UE is just Sent in the RB for receiving data transfer.DRS is sent as the specific signals of UE, therefore generally UE may not recognize other UE's DRS is transmitted.In order to support up to N number of space layer data transfer, it should up to N number of DRS be present.

In the following example, it is assumed that system supports multiple 8 space layer data transfers.For supporting good multi-user For the system of MIMO (MU-MIMO) transmission, the DRS that is sent for each UE should be eight orthogonal or with very good Correlation properties.In addition, the system for supporting up to 8 layers, which can be each layer, sends DRS, wherein UE various combination can be with One or more layers are exclusively used by, for its data transfer.In lte-a system, DRS can be referred to as data demodulation RS (DM RS)。

If it can be multiplexed for each layer of DRS with drying method.These methods can be code division multiplexing (CDM), frequency Divide multiplexing (FDM) and the combination of time division multiplexing (TDM).Figure 13 (a), 13 (b) and 13 (c) are shown based on CDM's and FDM The example of DRS multiplexings.Consider that (DRS layers 3 and 4 or even layer 5,6,7 and 8 will use mapping for 12 RE of layer 1 and layer 2 The similar approach of DRS sequences), 12 RE in single RB are as shown in Figure 14.

Figure 14 illustrates the exemplary RE patterns that the DRS layers 1 and 2 being multiplexed by the code in single RB take.

With reference to figure 14, the code of such as Walsh-Hadamard codes can be used on RE 1410 and 1420 (that is, in RE 1410 superior+1 and in RE 1420 superior+1, or in RE 1410 superior+1 and in RE 1420 superior -1 so that in time domain Two continuous RE be multiplied by walsh code again).How each DRS RE will will be applied to the DRS sequences about reality Method be described.In general, it can be for using available whole RB in systems to distribute for the RB of particular UE Subset.

Figure 15 illustrates the illustrative methods for generating DRS sequences.

With reference to figure 15, in whole system bandwidth, for example, some RB can be assigned to particular UE for scheduling.Such as Shown in Figure 15, e nodes B can generate the DRS sequences equal to the RB size corresponding with whole system bandwidth.E nodes B can The DRS sequence corresponding using the RB with distributing to UE from the DRS sequences of all generations performs the scheduling for particular UE.

Figure 16 illustrates the another exemplary method for generating DRS sequences.

With reference to figure 16, had any different with the DRS sequence generating methods shown in Figure 15, e nodes B can be generated to be equal to and distributed to The DRS sequences of the data RB of particular UE size.In this case, e nodes B can pass through such as MU-MIMO spatial domain It is multiplexed to be scheduled to the multiple UE for being assigned different RB.It is raw when the UE of spatial domain multiplexing is assigned different RB Into the DRS sequences for being used for each UE so that the sequence used in the RB of spatial reuse will be different.

As shown in Figure 16 (a), the part represented by oblique line is assigned to DRS being sent to the RB of particular UE.E nodes B can generate DRS sequences by application equal to the RS sequences of the size for the data RS for distributing to particular UE.

Figure 16 (b) is shown in which that e nodes B is that different DRS sequences are generated as each in UE UE1 and UE2 Situation.In this case, the DRS for each UE will not be orthogonal, and cause the channel estimation of difference and final Cause performance loss.In order to utilize orthogonal DRS to each transport layer for multiple UE, the DRS for the layer of code multiplexing is needed There is identical sequence.There need not be identical sequence in the case of the DRS for the layer of channeling.

Figure 17 illustrates the illustrative methods for generating DRS sequences.

In the presence of the method for each generation DRS sequence in the RB for distribution.Sequence for DRS can be directed to each The RB of distribution is generated.In order to be randomized the sequence pattern used in each RB, different DRS sequences by for each RB come Generation.It is to place RB indexes as the initial of sequence systematic function that one of different mode of sequence is generated for different RB A part for change value.

It will be given with reference to figure 18 for the RE collection of the CDM in a RB and add three methods of (or insertion) sequence Description.

Figure 18 (a), 18 (b) and 18 (c) illustrate the illustrative methods for generating the sequence in a RB.

Sequence generating method shown in Figure 18 (a), 18 (b) and 18 (c) generates the RE collection for the CDM in a RB Sequence.

First ray generation method shown in Figure 18 (a) generates the single DRS sequences of the DRS RE layers for code multiplexing. In this First ray generation method, long sequence is generated and is mapped to the DRS RE position public to all CDM DRS layers Put.For each DRS layers, different walsh codes is employed (Walsh cover) to provide between different DRS layers Orthogonality.It is DRS in the possibility with different sequential elements on the RE for be multiplied by walsh code and with the advantages of long sequence RE is effectively randomized, and causes more random interference to other cells.

The second sequence generating method shown in Figure 18 (b) generates the one or more of the DRS RE layers for being multiplied by code DRS sequences.In the second sequence generating method, long sequence is generated, and is mapped to identical sequence walsh code wherein The DRS RE positions that will be repeated in the resource of (Walsh extension) to be applied.Can be different for each layer of sequence. For each DRC layers, different walsh codes is used to provide the orthogonality between different DRS layers.In this side In method, because identical sequence is along the RE for wherein applying walsh code and repetition, so different layers can have difference DRS sequences, and still there is orthogonality between different DRS layers.This makes it possible to realize even in different cells Between possible orthogonal DRS transmission, wherein, DRS sequences are different.In the second sequence mapping method, layer index can be with It is the input to DRS sequences generation initialization value.

The 3rd sequence generating method shown in Figure 18 (c) is Figure 18 (a) and 18 (b) first and second sequence generation side Mixed method between method.Possible different DRS sequences are mapped to DRS RE, for being multiplied by the RE of walsh code set Each element.In example shown in Figure 18 (c), two different DRS sequences are mapped to DRS RE positions so that Walsh code is applied in different DRS sequences.In this approach, it may be possible to configure the DRS sequences so that the 2nd DRS Sequence is actually identical with the first DRS sequences.In the case where different DRS sequences are configured to identical, the life of the 3rd sequence It can be seen as the second sequence generating method into method.In DRS sequences event different from each other, the 3rd sequence generating method First ray generation method can be similar to.This method may be configured to the DRS interference being randomized between other cells, and And maintain the orthogonality of the DRS transmission between cell.

In the 3rd sequence generating method, the possibility identical between layer index and the RE set instructions for being multiplied by walsh code Or different DRS sequences can be the input to DRS sequences generation initialization value.

Figure 19 illustrates the illustrative methods for generating DRS sequences.

In the second approach, the sequence for DRS is generated for whole system bandwidth, and the RB each distributed makes With the subdivision of long DRS sequences.Describe three methods of the insertion for the CDM RE sequences gathered.

Figure 20 (a), 20 (b) and 20 (c) illustrate the illustrative methods for the formation sequence in a RB.

Figure 20 (a), 20 (b) and 20 (c) show and inserted in a RB for the RE of the CDM schemes sequences gathered Method.

First ray generation method is depicted in Figure 20 (a).Long DRS sequences are generated, and one of long DRS sequences Divide the DRS for being used for specific RB.Can be by long DRS sequences from the subcarrier maps of low-limit frequency position to highest frequency position Subcarrier.Depending on which RB is just used for data transfer, for specific RB DRS sequences will use have been mapped to it is whole A part in the long DRS sequences of individual system bandwidth.In First ray generation method, identical DRS sequences are used for wherein It has been multiplied by the different OFDM symbols of single group walsh code (Walsh extension).This allows the different DRS sequences between layer, and And the orthogonality between DRS layers is still assigned, and extraly assign the DRS orthogonalities between different cells.

In the second sequence generating method shown in Figure 20 (b), long DRS sequences are generated, and in the long DRS sequences A part be used for specific RB DRS.Can be by long DRS sequences from the subcarrier maps of low-limit frequency position to highest frequency The subcarrier of position.Depending on which RB is just used for data transfer, the DRS sequences for specific RB, which will use, has been reflected The part being mapped in the long DRS sequences of whole system bandwidth.In the second sequence generating method, possible different DRS sequences It is used for the different OFDM symbols for being wherein multiplied by single group walsh code.In this case, for by the layer of code division multiplexing In the basic DRS sequences of each be identical, and different DRS layers make on the top of given basic DRS sequences With different walsh codes.

The DRS of different layers for being frequency division multiplexed can have basic DRS sequences.Can be by with for each The different DRS sequences of OFDM symbol apply the second sequence generating method.Layer index, OFDM symbol index and it is possible Timeslot number (or subframe numbers) can be the input to long DRS sequences generation initialization value.

In addition, for the second sequence generating method, the DRS sequences for different OFMD symbols can be configured to by system It is identical so that the First ray generation method as shown in Figure 20 (a), identical DRS sequences are used for by with Walsh The RE that code character is multiplied.In Figure 20 (b) example, DRS sequences b_iAnd d_iDifference can be with DRS sequences a_iAnd c_iIt is identical.This makes figure First ray generation method shown in 20 (a) can be configured the second sequence generating method as shown in Figure 20 (b). In this case, the same or different DRS sequences for different OFDM symbol configuration instructions can be to DRS sequences Generate the input of initialization value.

The 3rd sequence generating method shown in Figure 20 (c) be substantially the first and second sequence generating methods element with The multiplication of element.The DRS sequences generated by the method as shown in the left part such as Figure 20 (c) correspond to a RB, and by such as scheming The DRS sequences of method generation shown in the right part of 20 (c) also correspond to a RB.The element multiplication that will can be generated in RB, To regenerate DRS sequences.In this case, the generation of two RB DRS sequences can be recycled and reused for.If 3GPP LTE System has the system bandwidth corresponding with 12 RB, then the generation for two RB DRS sequences can be repeated six times.

In this approach, can be by the way that there are the different RS sequences of different sequential values in all RE come extra Ground scrambles to Walsh extension RS sequences.Using this method, cause to reduce due to fertile because secondary RS sequences scramble Interference randomization effect loss (the identical sequence in DRS OFDM symbols) caused by your assorted extension RS sequences.3rd sequence Column-generation method can also be by making two input fields change to the sequence generation value for controlling different sequence properties and single RS Sequence is realized.If the group of cell is cooperating so that the cell in group shares different walsh codes, while not Cell in same group needs to be randomized, then the 3rd sequence generating method is particularly useful.

By provide generation DRS sequences required for sequence initialization value description.

In order to support effective MU-MIMO, DRS sequences can not be initialized using UE ID, but cell is used only ID, subframe numbers (or timeslot number), OFDM symbol (in subframe or time slot) index, layer index, normal or extension CP instructions Etc. the combination of (that is, the same or different DRS sequences for different OFDM symbol configuration instructions) initialize.Additionally Sequence initialization parameter can be that layer index (being calculated in CDM DRS layers) and frequency shift (FS) are indexed (between FDM DRS layers Calculate, to distinguish the DRS for being mapped to entirely different RE time-frequency location set).

Furthermore it is possible to extend DRS sequences over time with walsh code, or walsh code is covered and (is multiplied by) and is arrived The mode of DRS sequences, by DRS sequence mappings to DRS layers RE.Because walsh code sequence spreading assigns more preferable orthogonality category Property, and the sequence of Walsh cover assigns more preferable cross-correlation property.The side of walsh code is utilized in DRS mappings processing It is possible to carry out configuration to system in method.

Here, it is assumed that all DRS sequences are generated using pseudo-random binary sequence maker.Pseudo-random sequence passes through The Gold sequence of length 31 defines.The length M of output_PNSequence c (n), wherein n=0,1 ..., M_PN- 1, by such as the following Formula 24 defines.

[equation 24]

C (n)=(x₁(n+N_C)+x₂(n+N_C))mod 2

x₁(n+31)=(x₁(n+3)+x₁(n))mod 2

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod 2

Wherein N_C=1600 and first m-sequence will use x₁(0)=1, x₁... ,=0, n=1,2, (n) 30 initialize.

The initialization of second m-sequence is passed through using the value of the application depending on sequenceRepresent. Here, x₁(i) represent Gold sequence maker the first m-sequence and x₂(i) the second m-sequence of Gold sequence maker is represented.Remove Non-designated, otherwise the initialization value of Gold sequence will describe the initialization value of the second m-sequence.

For all DRS sequence generating methods, it is proposed that having layer index value, it indicates all CDM/FDM Which of CDM RE set in DRS RS set set is used as a part for sequence generation initialization value.Herein, And it is different that not all layer index indicated value, which must be directed to all DRS layers,.Some DRS layers can have identical layer index Instruction.Layer index instruction can be represented as frequency shift (FS) instruction.

In Figure 18 (a) and 18 (b) in the first and second sequence generating methods of diagram, available DRS sequences generate letter Number and its initialization value can be represented by equation 2 below 5 and 26.

[equation 25]

Herein, N_rbThe resource block index of PDSCH transmission corresponding to expression, and w (m) represents to take the fertile of DRS sequences The assorted code of that.The example of sequence initialization value is provided below by way of equation 26, whereinFloor (floor) function is represented, its In,For less than or equal to n_s/ 2 value.

[equation 26]

In Figure 18 (c) in the 3rd sequence mapping method of diagram, available DRS sequence-generating functions and its initialization value It can be represented by equation 2 below 7 and 28.Herein, N_FOIt is the function of DRS layer indexs, and is used as instruction and passes through The value of the layer group of frequency separation.

[equation 27]

Herein, N_rbThe resource block index of PDSCH transmission corresponding to expression, w (m) represent to take the Walsh of DRS sequences Code, N_layerIt is the layer index for basic DRS sequences, and l ' is the DRS sequence index as the function of OFDM symbol index. The use of two DRS sequence index of identical will be possible in RB.Different DRS layers can have identical basic sequence, with Just apply walsh code and assign the orthogonality between them.Exemplary sequence initialization value is given by equation 2 below 8 Go out.

[equation 28]

Herein, n_sIt is the timeslot number in radio frame,Represent physical-layer cell ID, and N_FOIt is DRS layer indexs Function, and represent the value for distinguishing layer index group different from each other by frequency.

In Figure 20 (a) in the First ray generation method of diagram, available DRS sequence-generating functions and its initialization value It can be represented by equation 2 below 9 and 30.Equation 29 represents the example of generation DRS sequences, and equation 30 represents to be used to give birth to Into the initial value of the DRS sequences.

[equation 29]

Herein, l is the OFDM symbol number in time slot, n_sIt is the timeslot number in a radio frame, andIt is to multiply With applied to there is timeslot number n_sIndex l OFDM symbol scrambled code sequence walsh code.

[equation 30]

Herein, l ' is for the DRS sequence index of the function of OFDM symbol index, and N_layerIt is to be used for basic DRS sequences The layer index of row.Different DRS layers can have identical basic sequence, so as to application walsh code and assign between them Orthogonality.DRS sequences can calculate the index of the OFDM symbol comprising the DRS RE in subframe.In different OFMD symbols In specific DRS sequences there is identical DRS sequences in the case of, l ' values can be selected as identical, its cause generate phase Same sequence.If two different DRS sequences are just being used for the DRS layers in RB, N_dmrsIt can be such as 2 value.It is specific Layer, which has, to be additionally inserted such as by the different basic sequence layer information in the initialization value of the expression of equation 3 below 1 and 32.

[equation 31]

Herein, n_sIt is the timeslot number in radio frame,It is physical-layer cell ID, andIt is to take to be applied to With there is timeslot number n_sIndex l OFDM symbol sequence walsh code.L is the OFDM symbol number in time slot.

Because DRS is DRS (Dedicated Reference Signal), it is possible to the sequence between normal CP and the CP of extension need not be distinguished, because This does not have CP information to be input into initialization value.Exemplary sequence initialization value can be provided by equation 3 below 2.

[equation 32]

Herein, n_sIt is the timeslot number in radio frame,It is physical-layer cell ID, and N_FOIt is indicated for a layer rope Draw the value of group, it is the function of DRS layer indexs.Layer index group can be distinguished by frequency.That is, N_FOIt is for DRS layers The frequency shift (FS) instruction (or 0 or 1) of the function of index.For the system with DRS layers, only up to two N_FOValue can be consolidated It is set to 0.N_FOThe example of value is illustrated in table 3 below, 4 and 5.

[table 3]

Layer index (from 1 number)	NFOValue
		1st, 2,5 or 7	0
3rd, 4,6 or 8	1

[table 4]

Layer index (from 1 number)	NFOValue
		1st, 2,5 or 6	0
3rd, 4,7 or 8	1

[table 5]

Layer index (from 1 number)	NFOValue
		1st, 2,3 or 4	0
5th, 6,7 or 8	1

In Figure 20 (b) in the second sequence generating method of diagram, available DRS sequence-generating functions and its initialization value It can be represented by equation 3 below 3 and 34.

[equation 33]

Herein, l ' is the DRS sequence index as the function of OFDM symbol index, andExpression, which is taken, to be had Time slot n_sDRS sequence index l ' walsh code.

[equation 34]

Herein, l ' is for the DRS sequence index of the function of OFDM symbol index.DRS sequence index can calculate bag The index of OFDM symbol containing the DRS RE in subframe.Specific DRS sequences in different OFMD symbols have identical DRS In the case of sequence, l ' values can be selected as identical, and it causes to generate identical sequence.Certain layer, which has, extraly to be inserted Different basic sequence layer information into initialization value.This can be represented by equation 3 below 5.

[equation 35]

The second sequence mapping method shown in Figure 20 (c) can be realized in a manner of three.

First embodiment method is by with the two Gold code sequences initialized by different initialization values.For giving birth to Represented into the example of DRS sequences by equation 3 below 6.

[equation 36]

Herein,WithBe respectively using with the Gold sequence of different initialization value initialization again The DRS sequences of generation.

It is to be used for First ray belowPossible Gold codes init attributes.

1. the layer of each code division multiplexing has different sequences

2. the layer of each frequency division multiplexing has different sequences

3. there is identical sequence between the RE that walsh code is multiplied

4. there is different sequences between cell

For First rayInitialization value can be by one in equation 3 below 7,38 and 39 come table Show.

[equation 37]

[equation 38]

[equation 39]

It is to be used for the second sequence belowPossible Gold codes init attributes.

1. the layer of all code division multiplexings has identical sequence

2. the layer of each frequency division multiplexing has same or different sequence

3. there is different sequences between the RE that walsh code is multiplied

4. there is different sequences between cell

For the second sequenceInitialization value can pass through one in equation 4 below 0,41,42 and 43 To represent.

[equation 40]

[equation 41]

[equation 42]

[equation 43]

In this example, the initialization value for the second sequence expressed in equation 40 to 43 can be reordered simultaneously And map.For example, defined as in the following manner：This will allow first and second sequence it Between different sequences generations, to create different sequences in the case of similar initialization value is created.

In Figure 20 (c) sequence generating method, one in RS sequences passes through cell ID, OFDM index (or DRS OFDM symbol counting/index), the combination of layer index and frequency shift (FS) index initializes.Other RS sequences pass through N_IIt is individual The combination of OFDM symbol index (or DRS OFDM symbols counting/index) initializes.First RS sequences will be in Walsh code-phase There is identical RS sequences on the RE multiplied, and do not have identical RS sequences on the RE that the 2nd RS sequences will be multiplexed in walsh code Row.

Value N_IIt can be the shared value of coordinate multipoint (CoMP) Cell Identity CI or multiple cells.Value N_INeed by with signal UE is sent to, so that RS sequences are correctly received in UE.It means that the base attribute of the first initialization value all including DRS OFDM symbol on do not change, and the second initialization value changes in all OFDM symbols including DRS.

Figure 21 illustrates the illustrative methods for generating DRS sequences in a RB.

Figure 21 is shown in which to generate different sequences for layer, and the situation for having used Walsh to extend.Scheming In 21, different sequences is used on all CDM DRS layers, and different walsh codes is used to keep on DRS layers Orthogonality.Each sequence for each CDM DRS layers is extended by walsh code.This means for passing through walsh code The single RE of extension, has used identical sequential value rather than walsh code element multiplication value.

Figure 22 is illustrated for sending DRS illustrative methods using the DRS sequences for generating two cells.

In the equation of the signal received by receiver shown in Figure 22 the right and for being received at Rx antenna ports The channel estimation of signal can be represented by equation 4 below 4 and 45.

[equation 44]

r₀=h₀·a_i+h₁·b_i+h₂·c_i+h₃·d_i+n₀

r₁=h₀·a_i-h₁·b_i+h₂·c_i-h₃·d_i+n₁

Herein, h₀、h₁、h₂And h₃Represent effective channel coefficients, a_iAnd b_iScrambled code sequence is represented, and is represented n₀And n₁Noise.

[equation 45]

From equation 44 and 45, it can be seen that be that estimated efficient channel coefficient has only one interference coefficient Z₁.Cause And the efficient channel coefficient estimated at receiver is interfered the influence of coefficient.

Figure 23 illustrates the illustrative methods for the formation sequence in a RB.

Figure 23 shows that e nodes B wherein generates the identical sequence for layer, and the feelings extended using Walsh Condition.In fig 23, different sequences has been used across all CDM DRS layers, and different Walsh codes is used across DRS layers To keep orthogonality.Section interference randomization between the example permission cell of the sequence utilized in method shown in Figure 23 is most Bigization.

Figure 24 is illustrated for sending DRS illustrative methods by the DRS sequences generated for it using two cells.

Received signal equation and estimated channel are for the viewpoint for receiving Rx antenna ports.

The signal received as the receiver shown in the right in Figure 24, and the signal for being received at Rx antenna ports The equation of channel estimation can be represented by equation 4 below 6 and 47.

[equation 46]

r₀=(h₀+h₁)·s_i+(h₂+h₃)·x_i+n₀

r₁=(h₀-h₁)·s_i+1+(h₂-h₃)·x_i+1+n₁

Herein, h0, h1, h2 and h3 represent effective channel coefficients, and ai and bi represent scrambled code sequence, and n0 and N1 represents noise.

[equation 47]

From equation 45, it can be seen that, estimated efficient channel coefficient has four different coefficient Z₁、Z₂、Z₃With And Z₄, wherein, the coefficient of randomization can be cancelled one another out so as to cause to be directed to h₀More accurate channel estimation.From equation, energy Enough it is appreciated that, the sequence mapping method illustrated in Figure 23 has the randomization for being four times in the sequence mapping method illustrated in Figure 21 Effect.

In order to be maximized from the interference randomization of the DRS sequences from other cells, DRS sequences ideally should be in institute Having has random value in RE, but simultaneously in order to keep the orthogonality between DRS layers to use identical in all DRS layers DRS sequences.It is that walsh code is led under specific precoding environment to have the problem of identical DRS sequence bands come in all layers Cause the serious power difference between OFDM symbol.

Figure 25 (a) and 25 (b), which illustrate, to be applied to two DRS layers by precoding and DRS layers is mapped into four Tx days Power difference between the illustrative methods of line, and the OFDM symbol neighbouring when sending DRS using this method.

With reference to figure 25 (a), precoding can be applied to two DRS layers by emitter, and be sent by four Tx antennas The DRS layers.During precoding shown in the application drawing 25, for each symbol by respective Tx antennas and the signal quilt that sends Right-hand component in Figure 25 (a) is shown.In the case of emitter sends signal in this way, between neighbouring OFDM symbol Power difference can about be approximately 2.25dB, as shown in Figure 25 (b).

Figure 26 illustrates the illustrative methods for generating DRS sequences.

In Figure 26 method, the different sequences for each layer are extended by walsh code, and then walsh code Sequence spreading is scrambled.

First sequence that ' a ' is expressed as in Figure 26 is used to distinguish the sequence between CDM layers.It is expressed as the second of ' s ' Individual sequence is used to distinguish the sequence between the mark of higher instruction.The mark of higher instruction can be following mark, Such as cell ID, CoMP cell group ID or in order to according to corresponding mark come other marks for distinguishing DRS sequences and providing.Phase Hope, the First ray for being expressed as ' a ' does not change the RE in the multiplication of Walsh code collection (for example, two OFDM symbols are continuous RE the value between).Walsh code can be multiplied by the top of First ray.Effectively, this can be by extending (by Walsh Code takes the sequence for creating longer sequence) wherein RE by for the DRS with Walsh-Hadamard codes come the time domain that positions In First ray realize.The second sequence for being expressed as ' s ' randomly changes value in all RE.Second sequence pair layer is not Become, and identical common sequence is therefore used in all layers.

Figure 27 is illustrated for sending the exemplary of DRS using the DRS sequences generated according to the method shown in Figure 26 Method.

The signal and the signal for being received in Rx antenna ports received by the receiver shown on the right of Figure 27 And the equation for the channel estimated can be represented by equation 4 below 8 and 49.

[equation 48]

r₀=(h₀·a_i+h₁·b_i)·s_i+(h₂·c_i+h₃·d_i)·x_i+n₀

r₁=(h₀·a_i-h₁·b_i)·s_i+1+(h₂·c_i-h₃·d_i)·x_i+1+n₁

[equation 49]

It can be seen that, estimated efficient channel coefficient has four different coefficient Z from equation 48 and 49₁、 Z₂、Z₃And Z₄, wherein the coefficient being randomized can be cancelled one another out so as to cause to be directed to h₀More accurate channel estimation.From etc. In formula, what is be able to know that is the sequence mapping method same stages that the sequence mapping method illustrated in Figure 27 has and illustrated in Figure 23 Other interference randomization effect, and it is four times in the randomization effect of the sequence mapping method described with reference to figure 21.

Figure 28 (a) and 28 (b) illustrate the illustrative methods for generating DRS sequences.

First sequence of layer can be generated by Gold codes sequence such as defined below.Or First ray can be solid Fixed sequence, wherein compared with the first sequence of layer, the sequence for second, third and the 4th layer is defined as some solid The unit circle complex values of phase bit skew.For example, as shown in Figure 28 (a), if the sequence of first layer is defined as wherein, Element in the sample table indicating value of sequence is { {+1 ,+1 ,+1 }, {+1 ,+1 ,+1 } } (before Walsh extension) in RB, Then the sequence for the second layer can be defined as

Specifically, it is assumed that the First ray for first layer be entirely ' 1 ' ({+1 ,+1 ,+1 } ,+1 ,+1 ,+ 1 } }), the First ray for other layers can be defined as Wherein k is layer index (being counted since 1), N is RB indexes, and f1 to f6 represents the time/frequency RE indexes in RB.Unit circle for layer in addition to first layer The example of value is Zadoff-Chu sequence, such asOr

In addition, the First ray for each layer can use fixed phase offset unit circle complex valued sequence and from all Generated such as the combination of the random complex value of the sequence generation of Gold codes.Such example is illustrated in Figure 29 (a) and 29 (b) In.Figure 29 (a) and 29 (b) illustrate the illustrative methods for generating DRS sequences.

The sequence generating method illustrated in Figure 21,23 and 26 can be redefined in a different manner.Figure 26 sequence Mapping method utilizes different sequences for different layers, and sequence in time does not change that (rather than walsh code is multiplied The factor).Or Figure 24 sequence mapping method utilizes identical sequence for different layers, and sequence in time changes. The potential problems that Figure 21 sequence mapping method is brought with the interference randomization from other cells, and Figure 23 sequence mapping Method has the potential problems that the PA designs at e nodes B are brought.Figure 26 sequence mapping method for different layers by making Figure 21 and 23 sequence mapping method is included with different sequences and using the different sequences across the time.In order to keep just The property handed over, two kinds of sequence is generated for Figure 26 sequence mapping method.One in sequence will manufacture difference between layers Sequence, and other sequences manufacture across the time different sequences.In addition, the value of two kinds of sequence types can change in frequency Become.

Figure 26 sequence mapping method can be realized in a variety of ways.First implementation will be directed to the generation of corresponding layer not Then same sequence, using walsh code sequence spreading, and is multiplied by for the second public sequence of all layers.Second implements Method is used for the common sequence of layer by generating, and covers the sequence using walsh code, and be then multiplied by different from each other second Sequence.Other alternative implementations need to reorganize the sequence mapping of the first and second sequences and multiplying for walsh code Method.

Or corresponding layer can be directed to and generate different sequences, and can be by alamouti coding applications to sequence.

Figure 30 illustrates the example that DRS signals are sent using the DRS sequences generated in two cells.

In this approach, different sequences is generated for corresponding layer, and by alamouti coding applications to often Individual sequence pair, to realize the orthogonality between layer.This method allow for the good interference from different cells with Machine, while effectively realizing different sequences for equivalent layer.

Figure 31 illustrates the alternative example of the DRS sequence mapping methods shown in Figure 26.

Figure 26 sequence mapping method can be multiplied together with a part for sequence, to form final DRS sequences.Change Sentence is talked about, and this method is by the specific sequence of extension layer, and it is specific with the public scramble sequence of layer to be multiplied by Walsh extension layer Some parts of sequence generate whole DRS sequences (being referred to as DM RS sequences in lte-a system).Specifically, the second sequence Row can be multiplied by the part of the First ray effectively extended by walsh code.It can be by only pair and in Figure 31 In a part for the second sequence that a part for Walsh sequence spreading (First ray) as shown in example is scrambled Realized with " 1 ".

Figure 32 (a) and 32 (b) illustrate the illustrative methods for generating the DRS sequences for each OFDM symbol.

With reference to figure 32 (a), in this DRS mapping method, according to the maximum belt in each OFDM symbol comprising the DRS Wide First ray and/or the sequence of the second sequence to generate for being used in the DRS for each layer.

The sequence of RB for distributing to each UE uses the sub-portion of the long sequence generated for whole bandwidth.Final SequenceIt can be defined as by represented by equation 5 below 0.Final sequence will be subframe in radio frame The function of OFDM symbol number in (or time slot) number, and the subframe.

[equation 50]

Herein,WithIt is the DRS for using the Gold sequence initialized with different initialization values to generate Sequence.

Can be that each subframe generates DRS sequences with reference to figure 32 (b).In this sequence mapping method, according to every height Maximum bandwidth in frame generates First ray and/or the sequence of the second sequence for being used in the DRS for each layer. In addition, before by the sequence mapping to next RB, the long sequence of generation will be mapped to that all RE in RB.For RB's Sequence uses the sub-portion in the long sequence generated for whole bandwidth.Final sequenceIt can be defined as passing through What equation 5 below 1 represented.Final sequence will be subframe (or time slot) number in radio frame, and the OFDM symbols in the subframe Number number function.

[equation 51]

In sequence mapping method shown in Figure 32 (b), because First ray is extended by Walsh-Hadamard codes The fact the reason for, the sequence length for the first and second sequences is different from each other.In the First ray finally extended To have and the second sequence identical sequence length.

Figure 33 illustrates the sequence mapping method relevant with the method shown in Figure 32 (a) and 32 (b) in more detail.

Normally, sequence frequency first is mapped in RB, and is then mapped to the OFDM symbol for including DRS RE.With institute There are CDM DRS layers to be mapped to frequency, and be then mapped into such mode of the OFDM symbol RE groups including DRS RE Perform scramble sequence mapping.By using this method, when UE has only been partially received downlink subframe, with UE generates DRS sequences, and UE can start to estimate channel.

The description of walsh code randomization will be provided.

In order to solve it is assumed that the high power transmission for specific T x antenna ports in the case of specific pre-coding matrix, It is contemplated that cyclic shift walsh code is used on whole frequency domain.This means from the perspective of single DRS layers, in frequency On walsh code be multiplied RE will change.Specifically, the walsh code for taking RE groups will be cyclic shift walsh code.It is assumed that It is defined as W using 2 Walsh code length, and for two orthogonal codes of given walsh code_0,1And W_1,1.This Outside, cyclic shift orthogonal code can be represented as W_0,2And W_1,2。

W_0,1={+1 ,+1 }

W_1,1={+1, -1 }

W_0,2={+1 ,+1 }

W_1,2={ -1 ,+1 }

It is assumed that it is defined W using Walsh code length 4, and for four orthogonal codes of given walsh code_0,1With W_1,1.In addition, cyclic shift orthogonal code is defined as W_0,k、W_1,k、W_2,kAnd W_3,k, wherein k is cyclic shift value.

W_0,1={+1 ,+1 ,+1 ,+1 }

W_1,1={+1, -1 ,+1, -1 }

W_2,1={+1 ,+1, -1, -1 }

W_3,1={+1, -1, -1 ,+1 }

W_0,2={+1 ,+1 ,+1 ,+1 }

W_1,2={ -1 ,+1, -1 ,+1 }

W_2,2={+1, -1, -1 ,+1 }

W_3,2={ -1, -1 ,+1 ,+1 }

W_0,3={+1 ,+1 ,+1 ,+1 }

W_1,3={+1, -1 ,+1, -1 }

W_2,3={ -1, -1 ,+1 ,+1 }

W_3,3={ -1 ,+1 ,+1, -1 }

W_0,4={+1 ,+1 ,+1 ,+1 }

W_1,4={ -1 ,+1, -1 ,+1 }

W_2,4={ -1 ,+1 ,+1, -1 }

W_3,4={+1 ,+1, -1, -1 }

Each DRS layers use walsh code W_n,mTo be multiplied by DRS sequences, wherein, n represents DRS layer indexs, and m is sub- load The function of ripple index.One example is m=k mod 2 or m=k mode 4, and wherein k is that only the subcarrier for carrying DRS is carried out The sub-carrier indices of counting.This means the orthogonal code overlay code for the specific DRS layers in RB can change between RB.

Figure 34 (a) illustrates the exemplary orthogonal code overlay code pattern for specific DRS layers, and Figure 34 (b) and 34 (c) Illustrate the example that the walsh code in RB uses.

From the perspective of single Tx antennas, by being multiplied by different cyclic shift walsh codes for each subcarrier (so that circulation walsh code pattern will repeat itself after 2 or 4 RB) helps to reduce the power difference between ODM symbols.

Because the power as shown in Figure 25 (b) of the power difference between causing OFDM symbol concentrates symbol (pre- 2*S after coding_iSymbol) substantially it is interleaved between multiple OFDM symbols.This to power by concentrating in time Symbol is randomized and mitigates the concentration of the power in single OFDM symbol.

Figure 35 illustrates the illustrative methods for mapping walsh code in frequency CDM RE groups.

Method of randomization using the method shown in Figure 35 is described.Can be in frequency CDM RE groups or time-frequency Walsh code is differently mapped in CDM RE groups.One example will be directed to specific first RB to (or 1RB) time forward mapping CDM Walsh element in RE groups, and in the neighbouring first RB pairs of the 2nd RB CDM RE groups different to time reverse Mapping Walsh code element.

It is applied to the first RB pairs and the neighbouring first RB pairs of the 2nd RB pairs of walsh code element and corresponds to Walsh code Element.Multiple CDM groups can be directed to one or more RB pairs and exist.For example, CDM groups 1 and CDM groups 2 can be directed to each RB Pair and exist.It is assumed that it is { a, b, c, d } by the walsh code set for being applied to each RB pairs.When walsh code is applied to During specific CDM groups (for example, CDM groups 1) of one RB centerings, walsh code element a, b, c in walsh code set { a, b, c, d } And d can be mapped to RE and cause walsh code element a, b, c and d (should by one-to-one mapping on the direction of time shaft With) RE is arrived, by one-to-one mapping to RE on the direction in opposite direction with time shaft, and then on the direction of time shaft By one-to-one mapping to RE.

When by walsh code be applied to the neighbouring first RB pairs the 2nd RB centerings specific CDM groups (for example, CDM groups 1) when, Walsh code element a, b, c and d in walsh code set { a, b, c, d } can be mapped to RE so that Walsh symbol Plain a, b, c and d first on the direction in opposite direction with time shaft by one-to-one mapping to RE, on the direction of time shaft By one-to-one mapping to RE, and then on the direction in opposite direction with time shaft by one-to-one mapping to RE.

In first and second RB pairs, walsh code is applied to by CDM groups 1 and CDM groups 2 with hop mode.For example, when fertile Your assorted data code a, b, c and d on the direction of time shaft by one-to-one mapping to RE in the first RB pairs of CDM groups 1 when, it is fertile Your assorted data code a, b, c and d can be with the hopping pattern of CDM groups 1 and by one-to-one mapping to CDM groups on the directions of time shaft RE (that is, the order for being applied to the walsh code element of CDM groups 1 and CDM groups 2 is different from each other) in 2.This is jumped Change can also be applied to the 2nd RB pairs.As described above, the walsh code element with hopping pattern can be applied to Each CDM groups in each RB.For the code interference between randomization layer, can utilize for every in time-frequency CDM RE set The code saltus step of individual layer.In this approach, each layer uses specific time-frequency CDM RE set (set for the RE that CDM is applied to) In walsh code.

Figure 36 (a) and 36 (b) illustrate the example of the code saltus step for two layers.

In example shown in 36 (a) and 36 (b), Walsh code length 2, W has been used_0,0Expression walsh code+1 ,+ , and W 1 }_1,0Represent {+1, -1 }.If the walsh code used in specific time-frequency CDM RE set is represented as W_k(wherein K represents code index), then k values can be the function of frequency or time-frequency.One example is to make k=(I_RB+I_freq+n_s) mod 2, its Middle I_RBIt is RB indexes, n_sIt is that time slot indexes, and I_freqIt is the frequency of CDM RE set that can be in the RB of value 0,1 and 2 Index.Other examples are k=(I_RB mod 3+I_freq)。

Figure 37 illustrates the example of the code saltus step for two layers.

In example shown in Figure 37, Walsh code length 4 has been used.When walsh code is W_kWhen, k represents code rope Draw.Walsh code W_kExample can be represented as it is as follows.

W₀={+1 ,+1 ,+1 ,+1 }

W₁={+1, -1 ,+1, -1 }

W₂={+1 ,+1, -1, -1 }

W₃={+1, -1, -1 ,+1 }

Or

W₀={+1 ,+1 ,+1 ,+1 }

W₁={+1, -1 ,+1, -1 }

W₂={+1, -1, -1 ,+1 }

W₃={+1 ,+1, -1, -1 }

In addition, can be combined together the saltus step in frequency or time-frequency CDM RE set and walsh code mapping, it is upper Mentioned in text.

Walsh code shown in application drawing 35 maps randomization, and during use Walsh code length 4, between layer Sequence is not randomized.

Figure 38 (a) and 38 (b) illustrate the example of the walsh code saltus step for four layers.

It can be seen that, the randomization of value is not completed between layer 1 and layer 4 from Figure 38 (a).For this specific feelings Condition, the symbol that can consider to be directed between all layers are randomized and utilize the code based on DFT.If use base as shown in Figure 38 (b) In DFT orthogonal code, then effective randomization of any combinations implementation value of layer can be directed to.Herein, it may be possible to use DFT Conversion code sequence, to substitute the DFT sequence value (DFT matrix columns vector) hereinafter mentioned.

Instead of DFT matrix column vectors are used as into code, to assign the orthogonality between layer, M ' column vector can be used (wherein M '=UM_DFT, and U is unitary matrice).Pay attention to, the code based on DFT, and this theory can be also utilized in code saltus step The further feature mentioned in bright book.

With reference to figure 38 (a), the walsh code mapping randomization shown in Figure 35 is applied to irrigating shown in Figure 38 (a) You are mapped assorted code, and during use Walsh code length 4, as described above, the sequence between layer is not randomized.Reference chart The walsh code element of 35 descriptions can represent that it can be applied to Figure 38 walsh code and reflect by following 4*4 matrixes Penetrate.

In this 4*4 matrix, walsh code element (a, b, c, d) can change in layer.For example, walsh code element (a, b, c, d) be (1,1,1,1) corresponding with the first row of 4*4 matrixes in layer 1, be in layer 2 with 4*4 matrixes second Arrange corresponding (1, -1,1, -1), be in layer 3 (1,1, -1, -1) corresponding with the 3rd row of 4*4 matrixes and in layer 4 In be (1, -1, -1,1) corresponding with the 4th row of 4*4 matrixes.

It can use to be mapped to walsh code element (a, b, c, d) with the method identical method illustrated in Figure 35 and be used for Multiple RB of each layer are to (for example, the first and second RB to).

With reference to figure 38 (a), (a, b, c, d)=(1,1,1,1) is mapped to RE on the direction of time shaft, (1,1,1,1) Be mapped to RE on the direction in opposite direction with time shaft, and then in layer 2 (1,1,1,1) in the direction of time shaft On be mapped to RE.Although Figure 38 (a) illustrate only the RE for two subcarriers in layer 1, walsh code element quilt Three subcarriers of a CDM group for a RB centering are applied to, as mentioned above.In layer 3, (a, b, c, d) =(1,1, -1, -1) is mapped to RE on the direction of time shaft, and (1,1, -1, -1) is by the side in opposite direction with time shaft RE is mapped to upwards, and then (1,1, -1, -1) is mapped to RE on the direction of time shaft.

As described above, it is capable of the walsh code sequences of the middle application of mapping graph 38 (a) so that it is repeated multiple frequencies Unit (for example, two RB).

The description of sequence initialization value will be provided.

It is assumed that all DRS sequences are generated using pseudorandom binary sequence maker.Pseudo-random sequence passes through length 31 Gold sequence defines.Length M_PNOutput sequence c (n), can be defined by equation 5 below 2, wherein n=0,1 ..., M_PN-1。

[equation 52]

C (n)=(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)=(x₁(n+3)+x₁(n))mod2

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2

Herein, N_C=1600 and first m-sequence should use x₁(0)=1, x₁... ,=0, n=1,2, (n) 30 Initialization.

The initialization of second m-sequence by using the application depending on sequence value byCarry out table Show.Herein, x₁(i) the first m-sequence of Gold sequence maker, and x are represented₂(i) the second of Gold sequence maker is represented M-sequence.Except non-designated, the initialization value of Gold sequence depicts the initialization value of the second m-sequence.According to this viewpoint, it is used for c^k(n) initialization value is represented as

Figure 39 illustrates the illustrative methods for generating two sequences.

The initiation parameter for being loaded into the shift register of the initialization value for the first and second sequences is used for every The shift register field of individual parameter.In addition, the initiation parameter for being loaded into First ray should not be with being loaded into the second sequence Initiation parameter together according to shift register positions it is common internally.This will ensure that two sequences do not generate identical sequence Train value.Equation 53 represents the example of formation sequence.

[equation 53]

Herein,WithRepresent to generate using the Gold sequence initialized with different initialization values DRS sequences, l ' be as OFDM symbol index function DRS sequence index, andRepresent timeslot number n_sWait be multiplied by DRS sequence index l ' walsh code.

The First ray for being responsible for scrambling value between different DRS layers may need the parameter in initialization value Combine below.N_layerIt is layer index, N_layerIt is cell ID, n_sIt is the time slot index in radio frame, l is the OFDM symbols in subframe Number index, and k be in subframe DRS OFDM symbols index.

The second sequence for being responsible for scrambling value between the ID of different higher instructions may need initialization value In parameter following combination.N_LH-IDIt is the ID (for example, cell ID, CoMP group ID etc.), N of higher instruction_cellidIt is cell ID, n_sIt is the time slot index in radio frame, 1 is the OFDM symbol index in subframe, and k is the OFDM symbol rope in subframe Draw.

Exemplary initialization value can be represented by equation 5 below 4 and 55.

[equation 54]

[equation 55]

In equation 54 and 55, it should select initialization value i₁、i₂、i₃And i₄So that it is carried in the displacement of initialization value Information on register is loaded into different shift register positions (for example, i₁=7, i₂=16, i₃=0, and i₄=3, It is assumed that N_layerIt is 3 bits, N_HL-IDIt is 9 bits, l can take the value from 0 to 13, and K can take the value from 0 to 3, and n_sEnergy Enough take the value from 0 to 20).

Describe another exemplary sequence mapping method.Equation 5 below 6 represents the example of formation sequence.

[equation 56]

Herein, l ' is the DRS sequence index of the function indexed for OFDM symbol, andRepresent time slot to be multiplied by Number n_sDRS sequence index l ' walsh code.

The First ray for being responsible for scrambling value between different DRS layers may need the parameter in initialization value Combine below.N_layerIt is layer index, and N_cellidIt is cell ID.

The second sequence for being responsible for scrambling value between the ID of different higher instructions may need initialization value In parameter following combination.N_LH-IDIt is the ID (for example, cell ID, CoMP group ID etc.) of higher instruction, and N_cellidIt is small Area ID, n_sIt is the time slot index in radio frame.

Exemplary initialization value can be represented by equation 5 below 7.

[equation 57]

In this illustration, it should select initialization value i₁、i₂And i₃So that it is carried in the shift register of initialization value On information be loaded into different shift register positions (for example, i₁=3, i₂=12, and i₃=0, it is assumed that N_layerIt is 3 Bit, N_HL-IDIt is the information of 9 bits).

Alternative sequence generation and mapping method

(it can also may be recorded as by the sequence length generated equal to the RB of distribution to generate and map First ray The Walsh fall-back sequence of layer specific).Similarly meanwhile, it is capable to which being equal to system bandwidth by generation (or is possibly even equal to quilt The maximum RB sizes that specification is supported) sequence length generate and map the second sequence (being recorded as a layer common sequence). In this case, sequence initialization value can be represented by equation 5 below 8.

[equation 58]

It is responsible for scrambling the value between different DRS layers and assigning the First ray of the orthogonality between DRS layers (the Walsh sequence spreading for being recorded as layer specific) may need the following combination of the parameter in initialization value, and it includes expression layer The N of index_layer, expression cell ID N_cellid, represent UE ID N_rntiAnd represent the n of the time slot index in radio frame_s。

It is responsible for indicating higher the second sequence (being recorded as a layer common sequence) that the value between ID is scrambled may need Want the following combination of the parameter in initialization value.Parameter includes representing higher instruction ID N_LH-ID(for example, cell ID, CoMP Group ID etc.), represent cell ID N_cellidAnd represent the n of the time slot index in radio frame_s。

Exemplary initialization value can be represented by equation 5 below 9.

[equation 59]

In the above example, initialization value being capable of value i₁=0, i₂=9, i₃=30, i₄=16 and i₅=0, and N_HL-IDIt is the information of 9 bits.

Even (layer specific can be recorded as by loading layer index in can be in the m-sequence for First ray one Walsh sequence spreading), and the value being made up of cell ID, UE ID and subframe index is loaded in other m-sequences.

Herein, the first m-sequence initialization value of the first Gold codes can be represented asAnd Second m-sequence initialization value of the first Gold codes can be expressed

Herein,AndOr

In this illustration, i₁=0, i₂=9, i₃=1, i₄=16, i₅=0, and N_HL-IDIt is the information of 9 bits.

Description will form the reason for randomization by carry out inter-cell interference with method of randomization.

Figure 40 illustrates sends DRS example using two cells by the DRS sequences generated for it.

Received signal equation and it is formulated as the channel estimated by the angle for Rx antenna ports Equation 60 and 61, as shown in Figure 40 right-hand component.

[equation 60]

r₀=h₀·a_i+h₁·b_i+h₂·c_i+h₃·d_i+n₀

r₁=h₀·a_i-h₁·b_i+h₂·c_i-h₃·d_i+n₁

Herein, h₀、h₁、h₂And h₃Represent effective channel coefficients, a_iAnd c_iExpression scrambled code sequence, and n₀And n₁Table Show noise.

[equation 61]

Figure 41 illustrates sends DRS example using two cells by the DRS sequences generated for it.

Received signal equation and it is formulated as the channel estimated by the angle for Rx antenna ports Equation 62 and 63, as shown in Figure 41.

[equation 62]

r₀=(h₀+h₁)·s_i+(h₂+h₃)·x_i+n₀

r₁=(h₀-h₁)·s_i+1+(h₂-h₃)·x_i+1+n₁

Herein, h₀、h₁、h₂And h₃Represent effective channel coefficients, s_iAnd x_iRepresent scrambled code sequence, and n₀And n₁ Represent noise.

[equation 63]

In the case of the equation 62 and 63 relevant with Figure 41, and compared with the equation 60 and 61 relevant with Figure 40, due to The interlayer interference from other cells is more caused to be deployed on whole all layers the reason for interference randomization factor.This Individual method can realize complete interference randomization.

Figure 42 illustrates sends DRS example using two cells by the DRS sequences generated for it.

Method shown in Figure 42 can be realized and imitated for the Walsh cover identical interference randomization of mixed method Fruit.

Received signal equation and it is formulated as the channel estimated by the angle for Rx antenna ports Equation 64 and 65, as shown in Figure 42.

[equation 64]

r₀=(h₀·a_i+h₁·b_i)·s_i+(h₂·c_i+h₃·d_i)·x_i+n₀

r₁=(h₀·a_i-h₁·b_i)·s_i+1+(h₂·c_i-h₃·d_i)·x_i+1+n₁

Herein, h₀、h₁、h₂And h₃Represent effective channel coefficients, s_iAnd x_iRepresent scrambled code sequence, and n₀And n₁ Represent noise.

[equation 65]

Figure 43 (a) illustrates the DRS sequences using generation to send DRS example, and Figure 43 (b) is illustrated according to figure The transmit power of transmission plan shown in 43 (a).

Under specific precoding environment shown in Figure 43 (b), there is two layers (possible even four for code division multiplexing Layer) identical DRS sequences can be by the transmit power difference between neighbouring OFDM symbol.

In Figure 43 (a), it is assumed that merely with layer common sequence.This means use identical sequence in each layer.This Outside, pre-coding matrix [+1, -1 ,+1, -1；+ 1 ,+j, -1 ,+1] the most UE broadband that be used to be directed in occupied bandwidth is pre- Coding.It is maximum caused by the walsh code combination of precoding compared with other OFDM symbols shown in Figure 43 (b) Transmit power difference can have up to+1dB~-1.25dB power differences.In the case of the possibility for LTE-A, wherein Four layers can be encoded being multiplexed, it is possible that maximum transmit power difference further increased to+2.4dB~-1.24dB.

Figure 44 illustrates the example that DRS is sent using the DRS sequences of generation.

As shown in Figure 44, if the sequence used in layer is allowed to have different sequential values, can be randomized Power collection neutralizes power nulling effect.After precoding as shown in Figure 43, when special symbol has 2*S_i(construction completely With) when, this power, which is concentrated, to be occurred, and when the special symbol of pre-coding matrix (destroy completely with) for 0, in specific frequency Power nulling is generated in subcarrier and OFDM symbol position.

Because sequential value changes with frequency and time, so construction and with destroying and being effectively randomized completely, And can avoid the worst situation scene (construction or destroy and occur over the whole width).Therefore in order to avoid certain day This power of line end mouth is concentrated, and should be different from each layer of sequence so that power concentration is dispersed in different Among RE, and preferably removed.

Description for solving the method for walsh code change and equal peak power problem by by forming.

Figure 45 is illustrated for by the illustrative methods of each layer of CDM code division dispensings.

When identical sequence is applied to all layers, DM is kept using different CDM codes for the DM RS of each layer Orthogonality between RS.It is for all in the RB that distributes to specify the simplest method of CDM codes by each DM RS layers Code {+1 ,+1 } is assigned to first layer by CDM RE set, and {+1, -1 } is assigned into the second layer, as shown in Figure 45.

Figure 46 (a) illustrates the example for sending DM RS sequences, and Figure 46 (b) illustrates the transmission side according to Figure 46 (a) The transmit power of case.

DM RS sequences for corresponding layer are multiplied by precoding elements, and are multiplexed together.This means for all Such as the specific pre-coding matrix row vector of [+1 ,+1] or [+1, -1], DM RS sequential values are combined and are sent to physical antenna On port, as shown in Figure 46 (b).Physical antenna port is combined to from CDM codes, the RE of specific precoding there can be zero power Rate and the RE of specific precoding can have twice of power.

Figure 46 (a) is shown before precoding and after precoding in the DM RS sequences of each transmission antenna.With reference to Figure 45 (b), when it is assumed that apply bandwidth precoding, and when have sent two layers, the physical antenna end in specific OFMD symbols Intraoral all DM RS RE can be with twice of power or zero energy.In addition, if it is assumed that be multiplexed four in a manner of CDM Layer and send, then the specific DM RS RE in specific OFDM symbol can with four times power and other DM RS RE can With with zero energy.Figure 46 (b) shows the specific physical antenna end of the average transmitting power change for each OFDM symbol The worst application scenarios of mouth.

Figure 47 illustrates exemplary DRS sequence mapping methods.

At e nodes B, the problem of high peak to average (PA) for specific RE power is key.Some needs in PA It is designed such that it can send higher power output in specific OFDM symbol.According to this viewpoint, it is to randomization CDM codes are favourable so that the DM RS values of precoding change in frequency.A method being randomized to CDM codes be Carry in DM RS each frequency sub-carrier and differently map walsh code, as shown in Figure 46.

Figure 48 illustrates the example that DRS is sent using the DRS sequences of generation.

Mean power from Tx antennas 1 can be the summation of the RE in subcarrier k and k+4.Although walsh code helps In somewhat mitigating peak power, but it not exclusively eliminates the problem.Therefore, it is necessary to consider solve peak power issue more General method.

Figure 49 is illustrated for the illustrative methods to DM RS application walsh codes.

It is for second layer randomization walsh code for solving the method for peak power issue.Carrying the every of DM RS In individual subcarrier, walsh code can be multiplied by different values, as shown in Figure 48.If realize the foot of each DM RS layers Enough randomizations, then it can remove the peak power issue even for four CDM layers.This means by by each Walsh Code is multiplied by the particular value in frequency domain or time domain, can be randomized the DM RS RE for the precoding of each physical antenna port.

Figure 50 and 51 is illustrated for the illustrative methods to four DM RS application walsh codes.

As illustrated in Figure 50 and 51, the sequence of different fixations is by a frequency domain (or even in the time domain, it is assumed that use The walsh code of length 2) it is multiplied by the walsh code of each DM RS layers.This allows each DM RS orthogonalization, and at random Peak power.

Figure 52 illustrates exemplary DM RS sequence mapping methods.

In order to allow the effective channel estimation at UE sides to realize that the scrambled code for DM RS needs to be mapped in it Middle UE generates scrambled code and performs the direction of channel estimation.Because DM RS CDM codes are employed in the time domain, so it may Realize it is favourable to specific UE, move on to DM RS sequence mappings to all CDM pairs and then next frequency Carrier wave.Proposed mapping method is shown in Figure 50.

Due to may be saved on different CDM RE collection using peak power issue caused by identical walsh code for e It is fastidious for point B PA designs.In order to solve this problem, the walsh code used in each layer can be multiplied by specific (or even random) value, this allow precoding DM RS RE randomization.This will be adjustable solution, especially It is even more so for determining with four CDM DM RS layers for LTE versions 10.Shown in Figure 50 for two The example of this method of CDM layers.Effective UE channel estimations embodiment can be realized by mapping DM RS scrambled codes, As shown in Figure 50.

Term 1RB described in the present invention includes 1 RB pairs.That is, 1RB include frequency domain in 12 subcarriers and 7 OFDM symbols in time domain, however, 1 RB is to including 14 OFDM symbols in time domain.In the present invention, made using 1RB Obtaining it is included with 1 RB to corresponding resource.

Figure 53 is the block diagram of devices in accordance with embodiments of the present invention 50.

With reference to figure 53, device 50 can be UE or e nodes B.Device 50 include processor 51, memory 52, RF units 53, Display unit 54 and user interface section 55.

The layer of Radio interface protocols is implemented in processor 51.Processor 51 provides control plane and user plane. The function of each layer can be realized in processor 51.Memory 52 is connected with processor 51, and storage program area, application Program and general file.

Display unit 54 shows various information, and can use known element, such as liquid crystal display (LCD), has Machine light emitting diode (OLED) etc..

User interface section 55 can be configured with the combination of user interface known to keypad, touch-screen etc..

RF units 53 are connected with processor 51, and send/receive RF signals.RF units 53 can be divided into processing Device transport module (not shown) and receiving module (not shown).

Based on low three layers of well known open system interconnection (OSI) model in communication system, the RF between UE and e nodes B The layer of interface protocol can be classified into first layer (L1), the second layer (L2) and third layer (L3).

Physical layer belongs to first layer, and provides information transfer service by physical channel.Wireless heterogeneous networks (RRC) layer Belong to third layer, and control Radio Resource is provided between UE and network.UE and network exchange RRC information by rrc layer.

The embodiments of the invention being described below are element and the combinations of feature of the present invention.Unless carry in addition Arrive, otherwise element or feature are considered selective.Put into practice in the case of can not being combined with other elements or feature Each element or feature.Furthermore it is possible to explain embodiments of the invention by combining the part of element and/or feature.Can be with Rearrange the operation order described in embodiments of the invention.Some structures of any one embodiment can be included in In another embodiment, and it can be replaced with the corresponding structure of another embodiment.To those skilled in the art Speech is it is readily apparent that the claim do not quoted each other clearly in the following claims can be as the reality of the present invention The combination for applying example is included as new claim to present, or by the subsequent modification after being submitted in application.

Various devices, such as hardware, firmware, software or its combination can be used to realize embodiments of the invention.Hard In part configuration, application specific integrated circuit (ASIC), digital signal processor (DSP), digital signal processing appts can be passed through (DSPD), PLD (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, Wei Chu One or more in reason device etc. realizes method according to an embodiment of the invention.

In firmware or software merit rating, embodiments of the invention can be realized in the form of module, process, function etc.. For example, software code can store in a memory cell, and performed by processor.Memory cell is located inside processor Or it is outside, and processor can be transmitted data to via various known devices and receives data from processor.

Those skilled in the art will be appreciated that, can in the case of without departing from the spirit or essential characteristics of the present invention To realize the present invention with other ad hoc fashions in addition to those set forth herein.Above-described embodiment is therefore all Aspect is interpreted illustrative and not restrictive.The scope of the present invention should be legal with theirs by appended claims Equivalent determines to determine, rather than by foregoing description, and falls into the meaning and equivalent scope of appended claims All changes, which are intended to, to be included therein.

Industrial usability

It can be applicable according to the apparatus and method for being used to send/receive in a wireless communication system reference signal of the present invention In wireless communication system, 3GPP LTE, the system of LTE-A, IEEE 802.16 etc..

Claims (14)

1. the specific reference signal of user equipment (UE) is sent to UE's by a kind of e nodes B being used in a wireless communication system Method, methods described include：

By the e nodes B by the way that walsh code set is applied into the reference signal sequence for resource element (RE) to generate The specific reference signal sequences of UE, the RE be assigned to for send the specific reference signals of the UE multiple layers in it is every One；And

The specific reference signal sequences of the UE generated are applied via each layer in the multiple layer by the e nodes B In the specific reference signals of the UE be sent to the UE,

Wherein, the walsh code set is described to being repeatedly applied in frequency domain direction for unit with two resource blocks (RB) Reference signal sequence,

Wherein, be mapped to first resource block (RB) to the mapping pattern of the walsh code set be different from being mapped to the Two RB pairs the walsh code set mapping pattern so that the walsh code set：

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the first subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described first RB pairs the second subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the 3rd subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the first subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the second subcarrier RE；And

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the 3rd subcarrier RE；With And

Wherein, the 2nd RB in frequency domain with the first RB to neighbouring.

2. the method according to claim 11, wherein：

The walsh code set includes the first walsh code for first layer group；And

First walsh code is applied to each layer of the first layer group.

3. according to the method for claim 2, wherein, first walsh code is：

[1 11 1] for first layer；

[1-1 1-1] for the second layer；

[1 1-1-1] for third layer；And

For the 4th layer of [1-1-1 1].

4. according to the method for claim 2, wherein, the walsh code set further comprises for second layer group Two walsh codes, and

Second walsh code, which is compared to first walsh code, has hopping pattern；

Second walsh code is applied to each layer of the second layer group.

5. a kind of user equipment (UE) being used in a wireless communication system is specifically joined from e Node-B receivers user equipment (UE) The method for examining signal, methods described include：

The specific reference signal sequences of UE are received by the UE via each layer in multiple layers from the e nodes B to be applied to The specific reference signals of the UE,

Wherein, the specific reference signal sequences of the UE are the multiple for being assigned to by the way that walsh code set is applied to The reference signal sequence of the resource element of each (RE) in layer generates,

Wherein, the walsh code set is described to being repeatedly applied in frequency domain direction for unit with two resource blocks (RB) Reference signal sequence,

Wherein, be mapped to first resource block (RB) to the mapping pattern of the walsh code set be different from being mapped to the Two RB pairs the walsh code set mapping pattern so that the walsh code set：

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the first subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described first RB pairs the second subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the 3rd subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the first subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the second subcarrier RE；And

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the 3rd subcarrier RE；With And

Wherein, the 2nd RB is in a frequency domain with the first RB to neighbouring.

6. the method according to claim 11, wherein：

The walsh code set includes the first walsh code of first layer group；And

First walsh code is applied to each layer of the first layer group.

7. according to the method for claim 6, wherein, first walsh code is：

[1 11 1] for first layer；

[1-1 1-1] for the second layer；

[1 1-1-1] for third layer；And

For the 4th layer of [1-1-1 1].

8. according to the method for claim 6, wherein, the walsh code set further comprises for second layer group Two walsh codes, and

Second walsh code, which is compared to first walsh code, has hopping pattern,

Second walsh code is applied to each layer of the second layer group.

9. one kind is used for the e nodes B for sending the specific reference signal of user equipment (UE) in a wireless communication system, the e sections Point B includes：

Processor, the processor are configured to：By the way that walsh code set to be applied to the reference for resource element (RE) Signal sequence generates the specific reference signal sequences of UE, and the RE is assigned to for sending the specific reference signals of the UE Multiple layers in each；And

RF units, the RF units are operationally connected to the processor and are configured to：Via each in the multiple layer Layer, the UE is sent to by the specific reference signals of the UE that the specific reference signal sequences of the UE generated are applied to,

Wherein, the walsh code set is described to being repeatedly applied in frequency domain direction for unit with two resource blocks (RB) Reference signal sequence,

Wherein, be mapped to first resource block (RB) to the mapping pattern of the walsh code set be different from being mapped to the Two RB pairs the walsh code set mapping pattern so that the walsh code set：

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the first subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described first RB pairs the second subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the 3rd subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the first subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the second subcarrier RE；And

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the 3rd subcarrier RE；With And

Wherein, the 2nd RB in frequency domain with the first RB to neighbouring.

10. e nodes B according to claim 9, wherein, the walsh code set includes first for first layer group Walsh code, and

First walsh code is applied to each layer of the first layer group.

11. e nodes B according to claim 10, wherein, first walsh code is：

[1 11 1] for first layer；

[1-1 1-1] for the second layer；

[1 1-1-1] for third layer；And

For the 4th layer of [1-1-1 1].

12. one kind is used for the user equipment (UE) for receiving the specific reference signal of user equipment (UE) in a wireless communication system, The UE includes：

Receiver；And

Processor, the processor are operatively coupled to the receiver and are configured to：Via each layer in multiple layers The specific reference signals of the UE that the specific reference signal sequences of UE are applied to are received,

Wherein, the specific reference signal sequences of the UE are assigned in the multiple layer by the way that walsh code set is applied to The reference signal sequence of the resource element of each (RE) generate,

Wherein, the walsh code set is described to being repeatedly applied in frequency domain direction for unit with two resource blocks (RB) Reference signal sequence,

Wherein, be mapped to first resource block (RB) to the mapping pattern of the walsh code set be different from being mapped to the Two RB pairs the walsh code set mapping pattern so that the walsh code set：

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the first subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described first RB pairs the second subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described first RB pairs the 3rd subcarrier RE；

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the first subcarrier RE；

The direction of time domain by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the second subcarrier RE；And

Time domain opposite direction by sequentially one-to-one mapping to distribute to the described 2nd RB pairs the 3rd subcarrier RE；With And

Wherein, the 2nd RB in frequency domain with the first RB to neighbouring.

13. UE according to claim 12, wherein, the walsh code set includes the first Walsh of first layer group Code, and

First walsh code is applied to each layer of the first layer group.

14. UE according to claim 13, wherein, first walsh code is：

[1 11 1] for first layer；

[1-1 1-1] for the second layer；

[1 1-1-1] for third layer；And

For the 4th layer of [1-1-1 1].