CN102696193A - Method and apparatus for generating a reference signal sequence in a wireless communication system - Google Patents

Abstract

The present invention provides a method and apparatus for generating a reference signal sequence by user equipment (UE) in a wireless communication system. The UE receives a UE-specific sequence group hopping (SGH) parameter that is specific to itself, and generates a reference signal sequence based on a base sequence in each slot unit. The base sequence is classified into sequence-group numbers determined in each of the slot units by the UE-specific SGH parameter indicating whether SGH has been carried out, and base sequence numbers.

Description

In wireless communication system, generate the method and apparatus of reference signal sequence

Technical field

The present invention relates to radio communication, more specifically, relate to the method and apparatus that in wireless communication system, generates reference signal sequence.

Background technology

Multiple-input and multiple-output (MIMO) technology can be used to improve data transmission that utilizes a plurality of transmitting antennas and a plurality of reception antennas and the efficient that receives.The MIMO technology can comprise: empty block code (SFBC) frequently, space-time block code (STBC), cyclic delay diversity (CDD), frequency switched transmit diversity (FSTD), time switched transmit diversity (TSTD), precoding vectors switch (PVS), spatial reuse (SM) to realize dividing collection.Mimo channel matrix according to reception antenna quantity and number of transmit antennas can be broken down into a plurality of independent channels.Each independent channel all is known as layer or stream.The quantity of layer is known as order (rank).

In wireless communication system, the purpose from transmitting and receive data, obtain system synchronization and feedback channel information is necessary estimating uplink channel or downlink channel.In wireless communication system environments, because of the multipath time delay produces decline.Thereby causing in the environment changing suddenly the distorted signals that produces through compensation by this decline recovers to send Signal Processing and is called as channel estimating.The sub-district or other sub-district that belong to for subscriber equipment, the also state of essential measured channel.For estimating the state of channel or measured channel, can use transmitter and all known reference signal (RS) of receiver.

The subcarrier that is used to send this reference signal is called as the reference signal subcarrier, and the subcarrier that is used to send data is called as data subcarrier.In ofdm system, the method for assignment reference signal comprises: to the method for all subcarrier assignment reference signals and between data subcarrier the method for assignment reference signal.Utilize only to comprise that the signal (like targeting signal) of reference signal carries out the method to all subcarrier assignment reference signals, so that obtain the throughput of channel estimating.If make in this way, then,, can improve performance for estimating channel so compare with the method for assignment reference signal between data subcarrier because the density of reference signal is higher usually.Yet,,, send data volume so that increase so use the method for assignment reference signal between data subcarrier because the transmission data volume is less in the method for all subcarrier assignment reference signals.If use the method for assignment reference signal between data subcarrier, then because the density of reference signal is lower, so performance for estimating channel maybe deterioration.Therefore, reference signal should be set suitably, so that minimize this deterioration.

Receiver can be estimated channel through the information of from received signal, separating relevant reference signal, because it knows the information of relevant reference signal, and through the estimated channel value of compensation, receiver can accurately be estimated the data that the transmission stage sends.Suppose that the reference signal that transmitter sends is p, the channel information that reference signal experienced during sending is h, and the thermal noise that occurs in the receiver is n, and the signal that receiver received is y, can draw y=hp+n.Here; Because receiver has been known reference signal p; So under the situation of using least square (LS) method, it can utilize equality 1 to come estimating channel information value

[equality 1]

$\hat{h}=y/p=h+n/p=h+\hat{n}$

P estimated using the reference signal channel estimation value

accuracy by the value

to determine.For estimated value h accurately, value

must converge on 0.For this reason, must come the influence of minimized value

through utilizing a large amount of reference signal estimated signal.Can there be the multiple algorithm that is used for better channel estimating performance.

Presence of intercell interference (ICI) when sending reference signal in order to minimize can be to reference signal sequence application sequence group frequency hopping (SGH) or sequence hopping (SH).When using SGH, the sequence set index of the reference signal sequence that in each time slot, sends can change.

In multi-user (MU) MIMO environment,, can use quadrature overlay code (OCC) for the orthogonality between the reference signal that guarantees a plurality of UE transmissions.When using OCC, can guarantee the improvement of orthogonality and throughput.Simultaneously, in the MU-MIMO environment, a plurality of UE can use different bandwidth.If when the reference signal of sending to a plurality of UE with different bandwidth is carried out SCH, use OCC, then increased the complexity of plot planning.That is, be difficult to guarantee orthogonality between the reference signal that a plurality of UE send.

Therefore, need be used to indicate to reference signal sequence is the another kind of method of carrying out SGH or carrying out SH.

Summary of the invention

Technical problem

The invention provides a kind of method and apparatus that in wireless communication system, generates reference signal sequence.

Technical scheme

On the one hand, a kind of method that in wireless communication system, is generated reference signal sequence by subscriber equipment (UE) is provided.Said method comprises: receive UE particular sequence group frequency hopping (SGH) parameter to the UE appointment; And generate reference signal sequence based on basic sequence to each time slot, wherein, said basic sequence according to by the specific SGH parameter of UE that indicates whether to carry out SGH to each time slot and definite sequence group number and basic sequence number are classified.

The specific SGH parameter of said UE can be through more high-rise transmission.

Said reference signal sequence can be to use the sequence of the demodulated reference signal (DMRS) of physical uplink link sharing channel (PUSCH) resource and restituted signal.

When the indication of the specific SGH parameter of said UE was not carried out SGH, the interior basic sequence of the sequence group number of the time slot in the sub-frame and sequence set number can be mutually the same.

When sequence hopping (SH) was not carried out in the indication of the specific SGH parameter of said UE, the interior basic sequence of the sequence group number of the time slot in the sub-frame and sequence set number can be mutually the same.

When the specific SGH parameter indication of said UE was not carried out SGH, the sequence group number of all time slots in the frame can be mutually the same.

Said method can also comprise: reception indicates whether to carry out the specific SGH parameter in sub-district of SGH, or indicates whether to carry out the specific SH parameter in sub-district of SH.When SGH was carried out in the indication of the specific GH parameter in sub-district, the specific SGH parameter of said UE can have precedence over the specific SGH parameter in said sub-district aspect the SGH indicating whether to carry out.When SH was carried out in the indication of the specific SH parameter in said sub-district, the specific SGH parameter of said UE can have precedence over the specific SH parameter in said sub-district aspect the SH indicating whether to carry out.

Said method also comprises: send said reference signal sequence through said reference signal sequence is mapped to subcarrier.

Said reference signal sequence can also generate based on cyclic shift.

Said basic sequence can be based on Zadoff-Chu (ZC) sequence.

Quadrature overlay code (OCC) can be applied to said reference signal sequence.Can be with indicating whether to use OCC through the more high-rise OCC index that sends.

On the other hand, a kind of device that is used to generate reference signal sequence is provided.Said device comprises: radio frequency (RF) unit; Be configured to receive subscriber equipment (UE) particular sequence group frequency hopping (SGH) parameter; And processor, be coupled to the RF unit, and be configured to generate burst based on basic sequence to each time slot; Wherein, said basic sequence according to by the specific SGH parameter of UE that indicates whether to carry out SGH to each time slot and definite sequence group number and basic sequence number are classified.

Beneficial effect

In the MU-MIMO environment, can guarantee to utilize the orthogonality between a plurality of UE of different bandwidth.

Description of drawings

Fig. 1 shows wireless communication system.

Fig. 2 shows the structure of the radio frame among the 3GPP LTE.

Fig. 3 shows the example of the resource grid of single downlink time slots.

Fig. 4 shows the structure of downlink subframe.

Fig. 5 shows the structure of uplink sub-frames.

Fig. 6 shows the example of the structure of the transmitter in the SC-FDMA system.

Fig. 7 shows the example of subcarrier mapper with the scheme of the respective sub of complex value sign map to frequency domain.

Fig. 8 shows the example of the structure of the reference signal transmitter that is used for demodulation.

Fig. 9 shows the example of the subframe that is used to send reference signal.

Figure 10 shows an example of the transmitter of the DFT-s OFDM delivery plan that utilizes sub-clustering.

Figure 11 shows another example of the transmitter of the DFT-s OFDM delivery plan that utilizes sub-clustering.

Figure 12 is another example of transmitter of utilizing the DFT-s OFDM delivery plan of sub-clustering.

Figure 13 shows example from OCC to reference signal that use.

Figure 14 is that a plurality of UE utilize different bandwidth to carry out the example that MU-MIMO sends.

Figure 15 is an example of not carrying out SGH and SH according to the specific SGH parameter of the UE that is proposed.

Figure 16 is the execution mode of the method for the generation reference signal sequence that proposes.

Figure 17 illustrates the BS of realization execution mode of the present invention and the block diagram of UE.

Embodiment

Following technology can be used for various wireless communication systems, like code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), OFDM (OFDMA), single-carrier frequency division multiple access (SC-FDMA) etc.CDMA can be implemented as the radiotechnics that inserts (UTRA) or CDMA 2000 such as general continental rise radio.TDMA can be implemented as the radiotechnics such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for gsm evolution (EDGE).OFDMA can realize through the radiotechnics such as Institute of Electrical and Electric Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, E-UTRA (evolution UTRA) etc.IEEE 802.16m (evolution of IEEE 802.16e) provides back compatible property to the system based on IEEE 802.16e.UTRA is the part of Universal Mobile Telecommunications System (UMTS).3GPP (third generation partner program) LTE (Long Term Evolution) is a part of utilizing the evolution UMTS (E-UMTS) of E-UTRA, and it adopts OFDMA and in up link, adopts SC-FDMA in down link.LTE-A (advanced person) is the evolution of 3GPP LTE.

Below, for the purpose of clarification, will mainly describe, but technological concept of the present invention is not limited thereto LTE-A.

Fig. 1 shows wireless communication system.

Wireless communication system 10 comprises at least one base station (BS) 11.Each BS 11 provides communication service to specific geographic area 15a, 15b, 15c (so-called sub-district).Each sub-district can be divided into a plurality of zones (being called the sector).Subscriber equipment (UE) 12 can be that fix or mobile; And can be known as other name, like MS (mobile radio station), MT (portable terminal), UT (user terminal), SS (subscriber station), wireless device, PDA (personal digital assistant), radio modem, handheld device.BS 11 is often referred to the fixed station of communicating by letter with UE 12, and can be known as other name, like eNB (evolution NodeB), BTS (basic transceiver system), access point (AP) etc.

In general, UE belongs to a sub-district, and the sub-district under the UE is called Serving cell.Provide the BS of communication service to be called serving BS broadcasts to Serving cell.This wireless communication system is a cellular system, thereby the existence different districts adjacent with Serving cell.The different districts adjacent with Serving cell is called neighbor cell.Provide the BS of communication service to be called neighbor bss to neighbor cell.Serving cell and neighbor cell are relatively confirmed based on UE.

This technology can be used for down link or up link.In general, down link refers to from the communication of BS 11 to UE 12, and up link refers to from the communication of UE 12 to BS 11.In down link, transmitter can be used as the part of BS 11, and receiver can be used as the part of UE 12.In up link, transmitter can be used as the part of UE 12, and receiver can be used as the part of BS 11.

This wireless communication system can be any in multiple-input and multiple-output (MIMO) system, the single output of many inputs (MISO) system, single input single output (SISO) system and the many output of single input (SIMO) system.Mimo system uses a plurality of transmitting antennas and a plurality of reception antenna.The MISO system uses a plurality of transmitting antennas and single receive antenna.The SISO system uses single transmitting antenna and single receive antenna.The SIMO system uses single transmitting antenna and a plurality of reception antenna.Below, transmitting antenna refers to be used to send the physics or the logical antenna of signal or stream, and reception antenna refers to be used to receive the physics or the logical antenna of signal or stream.

Fig. 2 shows the structure of the radio frame among the 3GPP LTE.

Can be with reference to " Technical Specification Group Radio Access Network to 3GPP (third generation partner program) TS 36.211 V8.2.0 (2008-03); Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8) " paragraph 5.With reference to Fig. 2, radio frame comprises 10 sub-frame, and a sub-frame comprises two time slots.Time slot in this radio frame is numbered with #0 to #19.Being used to send the time that a sub-frame spent is called transmission time interval (TTI).TTI is used for the thread that data are sent.For example, a radio frame can have the length of 10ms, and a subframe can have the length of 1ms, and a time slot can have the length of 0.5ms.

Time slot comprises a plurality of OFDMs (OFDM) symbol and a plurality of subcarriers in the frequency domain in the time domain.Because 3GPP LTE uses OFDMA in down link, so the OFDM symbol is used to represent the symbol period.Can the OFDM symbol be called other name according to the multiple access scheme.For example, when using single-carrier frequency division multiple access (SC-FDMA) as up link multiple access scheme, the OFDM symbol can be called the SC-FDMA symbol.Resource Block (RB) (resource allocation unit) comprises a plurality of continuous subcarrier in the time slot.The structure of this radio frame only is an example.That is the quantity of the OFDM symbol that comprises in the quantity of the time slot that comprises in the quantity of the subframe that, comprises in the radio frame, the subframe or the time slot can change.

3GPP LTE definition: a time slot comprises seven OFDM symbols in normal cyclic prefix (CP), and a time slot comprises six OFDM symbols in expansion CP.

Wireless communication system can be divided into FDD (FDD) scheme and time division duplex (TDD) scheme.According to the FDD scheme, carry out up link transmission and down link at the different frequency bands place and send.According to the TDD scheme, during same frequency band is in the different periods, carry out up link transmission and down link and send.The channel response of TDD scheme is reciprocal basically.This means downlink channel response and uplink response in allocated frequency band much at one.Thus, be, can obtain downlink channel response according to uplink channel responses based on the favourable part of the wireless communication system of TDD.In the TDD scheme, whole frequency band is sent to up link and the down link transmission is carried out the time-division, thereby can carry out the down link transmission of BS and the up link transmission of UE simultaneously.Up link transmission therein and down link send in the TDD system of distinguishing by subframe unit, in different subframes, carry out up link transmission and down link and send.

Fig. 3 shows the example of the resource grid of single downlink time slots.

Downlink time slots comprises a plurality of OFDM symbols and the N in the frequency domain in the time domain _RBThe Resource Block of quantity (RB).Be included in the N of the Resource Block in the downlink time slots _RBQuantity depends on that the down link that is provided with in the sub-district sends bandwidth.For example, in the LTE system, N _RBCan be any in 60 to 110.A Resource Block comprises a plurality of subcarriers in the frequency domain.Uplink time slot can have the structure identical with downlink time slots.

Each unit on the resource grid all is known as Resource Unit.In time slot, can index of reference to (k l) distinguishes Resource Unit on the resource grid.Here, and k (k=0 ..., N _RB* 12-1) be sub-carrier indices in the frequency domain, and l is the OFDM notation index in the time domain.

Here, illustration Resource Block comprise 7 * 12 Resource Units that constitute by seven OFDM symbols in the time domain and 12 number of sub-carrier in the frequency domain, but the quantity of the OFDM symbol in the Resource Block and the quantity of subcarrier are not limited thereto.The quantity of OFDM symbol and the quantity of subcarrier can be according to changes such as the length of Cyclic Prefix (CP), frequency intervals.For example, for the situation of normal CP, the quantity of OFDM symbol is 7, and for the situation of expanding CP, the quantity of OFDM symbol is 6.128, in 256,512,1024,1536 and 2048 can be by optionally as the quantity of the subcarrier in the OFDM symbol.

Fig. 4 shows the structure of downlink subframe.

In time domain, downlink subframe comprises two time slots, and in normal CP, each time slot comprises seven OFDM symbols.First three OFDM symbol of first time slot in the subframe (being maximum four OFDM symbols to the 1.4MHz bandwidth) is corresponding to the controlled area of having distributed control channel, and other residue OFDM symbol is corresponding to the data field of having distributed physical down link sharing channel (PDSCH).

PDCCH can deliver the paging information of the transmission form of downlink sharied signal channel (DL-SCH) and resource allocation, the resource allocation information of uplink shared channel (UL-SCH), relevant PCH, relevant DL-SCH system information, via PDSCH send such as the resource allocation of the more high-rise control messages of accidental access response, to one group of transmission power control commands of each UE in the particular UE group, the activation of internet protocol voice (VoIP) etc.Can in the controlled area, send a plurality of PDCCH, and UE can keep watch on a plurality of PDCCH.Send in PDCCH in a plurality of continuous control Channel Elementss (CCE) or the polymerization.CCE is the logical allocation unit that provides encoding rate to use according to wireless channel state.CCE is corresponding to a plurality of resource element groups.Incidence relation between the encoding rate that the form of PDCCH and the available bit number of PDCCH provide according to quantity and the CCE of CCE is confirmed.

The BS basis will be confirmed the PDCCH form to the DCI that UE sends, and Cyclic Redundancy Check is attached to DCI.Owner or purpose according to PDCCH are sheltered unique radio net temporary identifier (RNTI) on CRC.For the situation of the PDCCH that is used for particular UE, can on CRC, shelter unique identifier (for example, the sub-district RNTI (C-RNTI) of UE.Perhaps, for the situation of the PDCCH that is used for beep-page message, can on CRC, shelter paging indicator identifiers (for example, paging RNTI (P-RNTI)).For the situation of the PDCCH that is used for system information block (SIB), can be on CRC masking system information identifier (for example, system information RNTI (SI-RNTI)).In order to indicate accidental access response, that is,, can on CRC, shelter and insert RNTI (RA-RNTI) at random to the response of the random access guiding that sends UE.

Fig. 5 shows the structure of uplink sub-frames.

In frequency domain, uplink sub-frames can be divided into controlled area and data field.The physical uplink control channel (PUCCH) that is used to send uplink control information is assigned to the controlled area.The physical uplink link sharing channel (PUSCH) that is used to send data is assigned to the data field.If more high-rise indication is sent when then subscriber equipment can be supported PUCCH and PUSCH.

PUCCH to a UE presses RB to distributing.Belong in the right RB of this RB each time slot in first time slot and second time slot and take different subcarriers.Belonging to the right shared frequency of RB of RB of distributing to PUCCH changes at the boundary of time slot place.This be known as distribute to PUCCH RB to frequency hopping at the boundary of time slot place.Because UE through different sub carrier along with the time is sent the UL control information, so can obtain frequency diversity gain.In the figure, m is that the location index of the RB of PUCCH to the logic frequency domain position in subframe distributed in indication.

The uplink control information that on PUCCH, sends can comprise: the CQI (CQI) of the state of HARQ ACK/NACK, indicating downlink link channel, as dispatch request (SR) of uplink radio resource allocation request etc.

PUSCH is mapped to uplink shared channel (UL-SCH) (transmission channel).At the uplink data that sends on the PUSCH can be transmission block (data block of the UL-SCH that is used for during TTI, sending).Transmission block can be a user profile.Perhaps, uplink data can be a multiplex data.This multiplex data can be the data that obtain through the transmission block of the multiplexing UL-SCH of being used for and control information.For example, multiplexing control information to data can comprise: CQI, precoding matrix indicators (PMI), HARQ, order designator (RI) etc.Perhaps, uplink data can only comprise control information.

Fig. 6 shows the example of the structure of the transmitter in the SC-FDMA system.

With reference to Fig. 6, transmitter 50 comprises: DFT (DFT) unit 51, subcarrier mapper 52, invert fast fourier transformation (IFFT) unit 53 and Cyclic Prefix (CP) insert unit 54.Transmitter 50 can comprise: scramble unit (not shown), modulation mapper (not shown), layer mapper (not shown) and layer interchanger (not shown), they can be placed on the front of DFT unit 51.

The complex value symbol is exported through incoming symbol is carried out DFT in DFT unit 51.For example, when Ntx symbol of input (wherein, Ntx is a natural number), the DFT size is Ntx.DFT unit 51 can be known as the conversion precoder.Subcarrier mapper 52 is with the respective sub of complex value sign map to frequency domain.This complex value symbol can be mapped to and divide the corresponding Resource Unit of Resource Block that is used in the data transmission.Subcarrier mapper 52 can be known as the Resource Unit mapper.The baseband signal (that is time-domain signal) that is used for data is exported through incoming symbol is carried out IFFT in IFFT unit 53.CP inserts some of rear portion that unit 54 duplicates the baseband signal that is used for data, and the part that will duplicate is inserted into the front portion of the baseband signal that is used for data.Because insert through CP and to prevent intersymbol interference (ISI) and inter-carrier interference (ICI), so even in multipath channel, also can keep orthogonality.

Fig. 7 shows the example of subcarrier mapper with the scheme of the respective sub of complex value sign map to frequency domain.With reference to Fig. 7 (a), the subcarrier that subcarrier mapper will be adjacent to each other from complex value sign map to the frequency domain of DFT unit output." 0 " is inserted in the subcarrier that does not shine upon the complex value symbol.This is called the localization mapping.In 3GPP LTE system, use the localization mapping scheme.With reference to Fig. 7 (b), subcarrier mapper is whenever at a distance from two " 0 " (L are a natural number) in abutting connection with complex value symbol insertion (L-1) quantity of exporting from the DFT unit.That is the complex value sign map that, will export from the DFT unit is to the subcarrier that frequency domain, distributes by equal intervals.This is known as distributed mapping.If subcarrier mapper is used as the localization mapping scheme of Fig. 7 (a) perhaps like the distributed mapping scheme of Fig. 7 (b), then keep single-carrier property.

Fig. 8 shows the example of the structure of the reference signal transmitter that is used for demodulation.

With reference to Fig. 8, reference signal transmitter 60 comprises: subcarrier mapper 61, IFFT unit 62 and CP insert unit 63.The transmitter 50 that is different from Fig. 6 in reference signal transmitter 60, directly generates reference signal and need not pass through DFT unit 51 in frequency domain, map to subcarrier through subcarrier mapper 61 then.Here, subcarrier mapper can utilize the localization mapping scheme of Fig. 7 (a) that reference signal is mapped to subcarrier.

Fig. 9 shows the example of the subframe that is used to send reference signal.The structure of the subframe among Fig. 9 (a) shows the situation of normal CP.This subframe comprises first time slot and second time slot.In first time slot and second time slot each all comprises 7 OFDM symbols.14 OFDM symbols in this subframe are assigned notation index 0 to 13 respectively.Can send reference signal through OFDM symbol with notation index 3 and 10.This reference signal can utilize a sequence to send.Can be with Zadoff-Chu (ZC) sequence as reference signal sequence.Can generate multiple ZC sequence according to root index and cyclic shift value.BS can come to estimate through orthogonal sequence or accurate orthogonal sequence the channel of these UE through different cyclic shift value are distributed to a plurality of UE.Can be mutually the same or differ from one another in the position that reference signal takies in two time slots in the subframe in frequency domain.In these two time slots, use the same reference burst.Can send data through the residue SC-FDMA symbol outside the SC-FDMA symbol that sends reference signal.The structure of the subframe among Fig. 9 (b) shows the situation of expansion CP.This subframe comprises first time slot and second time slot.In first time slot and second time slot each all comprises 6 SC-FDMA symbols.12 SC-FDMA symbols in this subframe are assigned notation index 0 to 11.SC-OFDM symbol through having notation index 2 and 8 sends reference signal.Residue SC-FDMA symbol through outside the SC-FDMA symbol that sends reference signal sends data.

Although Fig. 9 is not shown, can send detection reference signal (SRS) through the OFDM symbol in this subframe.SRS sends, is used for the reference signal of UL scheduling to BS from UE.BS estimates the UL channel through the SRS that receives of institute, and in UL dispatches the estimated UL channel of use.

The DFT-s OFDM delivery plan of sub-clustering is the revision of existing SC-FDMA delivery plan, be with the data symbol that stands precoder be divided into many sub-block, separate this a little and in frequency domain this method of a little of mapping.

Figure 10 shows an example of the transmitter of the DFT-s OFDM delivery plan that utilizes sub-clustering.With reference to Figure 10, transmitter 70 comprises: DFT unit 71, subcarrier mapper 72, IFFT unit 73 and CP insert unit 74.Transmitter 70 can also comprise: scramble unit (not shown), modulation mapper (not shown), layer mapper (not shown) and layer interchanger (not shown), they can be placed on the front of DFT unit 71.

The complex value symbol of 71 outputs is divided into N sub-block (N is a natural number) from the DFT unit.This N sub-block can use sub-piece #1, sub-piece #2 ..., sub-piece #N representes.Subcarrier mapper 72 this N sub-block that in frequency domain, distributes, and this N sub-block mapped to subcarrier.Can whenever insert NULL at a distance from two sub-pieces of adjacency.Complex value symbol in one sub-block can map to the subcarrier that in frequency domain, is adjacent to each other.That is, can in a sub-block, use the localization mapping scheme.

The transmitter 70 of Figure 10 can be used in SCPC transmitter or the multicarrier transmitter.If transmitter 70 is used in the SCPC transmitter, then whole N sub-block are corresponding to a carrier wave.If transmitter 70 is used in the multicarrier transmitter, then each in the N sub-block can be corresponding to a carrier wave.Alternatively, even transmitter 70 is used in the multicarrier transmitter, the many sub-block in the N sub-block also can be corresponding to a carrier wave.Simultaneously, in the transmitter 70 of Figure 10, generate time-domain signal through an IFFT unit 73.Therefore, for the transmitter 70 that makes Figure 10 is used in the multicarrier transmitter, in must aligned abutment allocation of carriers situation in abutting connection with the subcarrier spacing between the carrier wave.

Figure 11 shows another example of the transmitter of the DFT-s OFDM delivery plan that utilizes sub-clustering.With reference to Figure 11, transmitter 80 comprises: DFT unit 81, subcarrier mapper 82, a plurality of IFFT unit 83-1,83-2 ..., 83-N (N is a natural number) and CP insert unit 84.Transmitter 80 can also comprise: scramble unit (not shown), modulation mapper (not shown), layer mapper (not shown) and layer interchanger (not shown), they can be placed on the front of DFT unit 71.

To each the independent IFFT that carries out in the N sub-block.N IFFT unit 38-n through antithetical phrase piece #n carry out IFFT export n baseband signal (n=1,2 ..., N).N baseband signal multiply by n carrier signal, to generate n radio signal.After having added N the radio signal that generates by the N sub-block, insert unit 314 through CP and insert CP.The transmitter 80 of Figure 11 can with the carrier wave of distributing to transmitter therein each other not adjacency not in the allocation of carriers situation.

Figure 12 is another example of transmitter of utilizing the DFT-s OFDM delivery plan of sub-clustering.Figure 12 is to be the specific DFT-s ofdm system of block that the DFT precoding is carried out on the basis with the block.This can be known as NxSC-FDMA.With reference to Figure 12, transmitter 90 comprises: code block division unit 91, block division unit 92, a plurality of chnnel codings unit 93-1 ..., 93-N, a plurality of modulator 94-1 ..., 94-N, a plurality of DFT unit 95-1 ..., 95-N, a plurality of subcarrier mapper 96-1 ..., 96-N, a plurality of IFFT unit 97-1 ..., 97-N and CP insert unit 98.Here, N can be the quantity of the multicarrier of multicarrier transmitter use.Chnnel coding unit 93-1 ..., among the 93-N each can comprise scramble unit (not shown).Modulator 94-1 ..., 94-N can also be known as modulation mapper.Transmitter 90 can also comprise can be placed on DFT unit 95-1 ..., 95-N the layer mapper (not shown) and the layer interchanger (not shown) of front.

Code block division unit 91 will be sent piece and will be divided into a plurality of code blocks.Block division unit 92 is divided into a plurality of blocks with these code blocks.Here, code block can be the data that multicarrier transmitter sends, and block can be the data slot through a transmission in the multicarrier.Transmitter 90 is that DFT is carried out on the basis with the block.Transmitter 90 can be used in not in abutting connection with the allocation of carriers situation or in the allocation of carriers situation.

Below, the UL reference signal is described.

In general, reference signal is sent by the form of sequence.Can particular sequence be used as reference signal sequence, and not need special restriction.Computer formation sequence based on phase shift keying (PSK) can be used as reference signal sequence.The example of PSK comprises binary phase shift keying (BPSK) and QPSK (QPSK).Alternatively, can be with permanent envelope zero automatically relevant (CAZAC) sequence as reference signal sequence.The example of CAZAC sequence comprises: based on the sequence of Zadoff-Chu (ZC), have the ZC sequence of cyclic extensions and have the ZC sequence of blocking.Alternatively, can be with pseudorandom (PN) sequence as reference signal sequence.The example of PN sequence comprises: m sequence, computer formation sequence, gold sequence and Kasami sequence.Can be with cyclically shifted sequences as reference signal sequence.

The UL reference signal can be divided into demodulated reference signal (DMRS) and detection reference signal (SRS).DMRS is the reference signal of using in the channel estimating that is used for the demodulation received signal.DMRS can be associated with the transmission of PUSCH or PUCCH.SRS is the reference signal that is used for the UL scheduling of sending to BS from UE.The SRS that BS passes through to be received estimates the UL channel, and in the UL scheduling, uses estimated UL channel.SRS is not associated with the transmission of PUSCH or PUCCH.Can be used to DMRS and SRS with a kind of basic sequence.Simultaneously, in the many antenna transmission of UL, the precoding that is applied to DMRS can be identical with the precoding that is applied to PUSCH.It is the major programme that is used for multiplexing DMRS that cyclic shift is separated.In the LTE-A system, SRS can be by precoding, and can be the antenna specific reference signals.

Can be according to equality 2 based on basic sequence b _{U, v}(n) and cyclic shift α define reference signal sequence r _{U, v} ^(α)(n).

[equality 2]

$r_{u,v}^{\left(\mathrm{\&alpha;}\right)}\left(n\right)=e^{\mathrm{j\&alpha;n}}{b}_{u,v}\left(n\right),0\&le;n<M_{\mathrm{sc}}^{\mathrm{RS}}$

In equality 2, M _Sc ^RS(1≤m≤N _RB ^{Max, UL}) be the length of reference signal sequence, and M _Sc ^RS=m*N _Sc ^RBN _Sc ^RBIt is size by the indicated Resource Block of the quantity of frequency domain sub-carriers.N _RB ^Max, UL indicates by N _Sc ^RBThe maximum of UL bandwidth of multiple indication.Can be through defining a plurality of reference signal sequences according to different ground of basic sequence application cycle shift value α.

Basic sequence b _{U, v}(n) be divided into a plurality of groups.Here, u ∈ 0,1 ..., 29} indicates group index, and the basic sequence index in the v indication group.Basic sequence depends on the length M of basic sequence _Sc ^RSTo m (1≤m≤5), each group all comprises having M _Sc ^RSThe basic sequence (v=0) of length, to m (6≤m≤n _RB ^{Max, UL}), each group all comprises having M _Sc ^RS(2 basic sequences (v=0,1) of length.Sequence set index u in the group and basic sequence index v can be as changing according to the time in group frequency hopping or the sequence hopping.

And, if the length of reference signal sequence is 3N _Sc ^RBOr bigger, then can define basic sequence through equality 3.

[equality 3]

$b_{u,v}\left(n\right)=x_q\left(n\mathrm{mod}{N}_{\mathrm{ZC}}^{\mathrm{RS}}\right),0\&le;n<M_{\mathrm{sc}}^{\mathrm{RS}}$

In equality 3, the root index of q indication Zadoff-Chu (ZC) sequence.N _ZC ^RSBe the length of ZC sequence, and can be to compare M _Sc ^RSLittle largest prime number.ZC sequence with root index q can define through equality 4.

[equality 4]

$x_q\left(m\right)=e^{-j\frac{\mathrm{\&pi;qm}(m+1)}{N_{\mathrm{ZC}}^{\mathrm{RS}}}},0\&le;m<N_{\mathrm{ZC}}^{\mathrm{RS}}-1$

Q can provide through equality 5.

[equality 5]

$\stackrel{\&OverBar;}{q}=N_{\mathrm{ZC}}^{\mathrm{RS}}\&CenterDot;(u+1)/31$

If the length of reference signal sequence is 3N _Sc ^RBOr littler, then can define basic sequence through equality 6.

[equality 6]

$b_{u,v}=\left(n\right)=e^{\mathrm{j\&phi;}\left(n\right)\mathrm{\&pi;}/4},0\&le;n<M_{\mathrm{sc}}^{\mathrm{RS}}-1$

Table 1 is at M _Sc ^RS=N _Sc ^RBShi Dingyi

Example.

[table 1]

Table 2 is at M _Sc ^RS=2*N _Sc ^RBShi Dingyi

Example.

[table 2]

The frequency hopping of reference signal can be used as follows.

Can be according to equality 7 based on group frequency-hopping mode f _Gh(n _s) and sequence shift mode f _SsDefine and have time slot index n _sSequence set index u.

[equality 7]

u＝(f _gh(n _s)+f _ss)mod?30

Can there be 17 not different sequence shift modes of frequency-hopping mode on the same group with 30.Can indicate whether the set of applications frequency hopping by high level more.

PUCCH can have identical group frequency-hopping mode with PUSCH.Can come definitions section frequency-hopping mode f through equality 8 _Gh(n _s).

[equality 8]

In equality 8, c (i) is the pseudo random sequence as the PN sequence, and can be that 31 Gold sequence defines through length.Equality 9 shows the example of gold sequence c (n).

[equality 9]

c(n)＝(x ₁(n+N _c)+x ₂(n+N _c))mod?2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod?2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₁(n+1)+x ₁(n))mod?2

Here, Nc=1600, x ₁(i) be a m sequence, and x ₂(i) be the 2nd m sequence.For example, a m sequence or the 2nd m sequence can be according to coming initialization to the number of timeslots in the cell identifier (ID) of each OFDM symbol, the radio frame, OFDM notation index and the type of CP in the time slot.In in each radio frame first, pseudo-random sequence generator can be initialized as

PUCCH can have identical sequence shift mode with PUSCH.The sequence shift mode of PUCCH can be f _Ss ^PUCCH=N _ID ^CellMod 30.The sequence shift mode of PUSCH can be f _Ss ^PUSCH=(f _Ss ^PUCCH+ Δ _Ss) mod30, and Δ _Ss∈ 0,1 ..., 29} can be disposed by high level more.

Sequence hopping can only be applied to has the 6N of ratio _Sc ^RBThe reference signal sequence of longer length.Here, can define through equality 10 and have time slot index n _sThe basic sequence group in basic sequence index v.

[equality 10]

Can represent c (i) with the example of equality 9.The application sequence frequency hopping can be indicated by high level more.In in each radio frame first, pseudo-random sequence generator can be initialized as

DMRS sequence to PUSCH can define through equality 11.

[equality 11]

$r^{\mathrm{PUSCH}}(m\&CenterDot;M_{\mathrm{sc}}^{\mathrm{RS}}+n)=r_{u,v}^{\left(\mathrm{\&alpha;}\right)}\left(n\right)$

In equality 11, m=0,1 ... And n=0 ..., M _Sc ^RS-1.M _sc ^RS=M _sc ^PUSCH。

α=2 π n _Cs/ 12, that is, in time slot, provide cyclic shift value, and n _CsCan define through equality 12.

[equality 12]

$n_{\mathrm{cs}}=(n_{\mathrm{DMRS}}^{\left(1\right)}+n_{\mathrm{DMRS}}^{\left(2\right)}+n_{\mathrm{PRS}}\left(n_s\right))\mathrm{<figure-callout\; id="12"\; label="mod"\; filenames="HDA00001865948600011.png"\; state="\{\{state\}\}">mod</figure-callout>}12$

In equality 12, indicate n with more high-rise parameter of sending _DMRS ⁽¹⁾, and table 3 shows this parameter and n _DMRS ⁽¹⁾Between the example of corresponding relation.

[table 3]

Parameter	n	DMRS (1)
			0	0
1	2
		2	3
3	4
		4	6
5	8
		6	9
7	10

Return equality 12, can be through defining n to the cyclic shift field of sending in the DCI form 0 of corresponding transmission piece with PUSCH _DMRS ⁽²⁾This DCI form sends in PDCCH.The cyclic shift field can have the length of 3 bits.

Table 4 shows this cyclic shift field and n _DMRS ⁽²⁾Between the example of corresponding relation.

[table 4]

Cyclic shift field in the DCI form 0	n DMRS (2)
		000	0
001	6
		010	3
011	4
		100	2
101	8
		110	10
111	9

If in same transmission piece, do not send the PDCCH that comprises DCI form 0; If semi-static ground (semi-persistently) scheduling the one PUSCH in same transmission piece; If perhaps in same transmission piece, utilize accidental access response to permit dispatching a PUSCH, then n _DMRS ⁽²⁾Can be 0.

n _PRS(n _s) can define through equality 13.

[equality 13]

$n_{\mathrm{PRS}}\left(n_s\right)={\mathrm{\&Sigma;}}_{i=0}^{7}c(8N_{\mathrm{symb}}^{\mathrm{UL}}\&CenterDot;n_s+i)\&CenterDot;2^i$

Can represent c (i) with the example of equality 9, and can use c (i) by the sub-district ad hoc fashion of c (i).In in each radio frame first, pseudo-random sequence generator can be initialized as

DMRS sequence r ^PUSCHMultiply by amplitude zoom factor β _PUSCH, and from the initial r of sequence ^PUSCH(0) maps to the physics that in relevant PUSCH sends, uses and send piece.Under the situation of normal CP, the DMRS sequence is mapped to the 4th OFDM symbol (OFDM notation index 3) in the time slot, and under the situation of expansion CP, the DMRS sequence is mapped to the 3rd OFDM symbol (OFDM notation index 2) in the time slot.

Definition SRS sequence r _SRS(n)=r _{U, v} ^(α)(n).U indication PUCH sequence set index, and v indication basic sequence index.Cyclic shift value α defines through equality 14.

[equality 14]

$\mathrm{\&alpha;}=2\mathrm{\&pi;}\frac{n_{\mathrm{SRS}}^{\mathrm{cs}}}{8}$

n _SRS ^CsBe the value relevant, and can be from 0 to 7 the integer any with each UE by more high-rise configuration.

Simultaneously, orthogonal code covers (OCC) and can be applied to reference signal sequence.OCC means the code that has different orthogonal property and can be applied to sequence.In general,, different sequences can be used, but the OCC said a plurality of channel that is distinguished from each other can be utilized for a plurality of channels that are distinguished from each other.

OCC can be used to following purpose.

1) can use OCC, so that increase the amount of the radio resource of distributing to uplink reference signals.

For example, the cyclic shift value of the reference signal of supposing in first time slot and second time slot, to send is assigned to a, then can symbol (-) be distributed to the reference signal of in second time slot, sending.That is, first user can send the reference signal with cyclic shift value a and symbol (+) in second time slot, and second user can send the reference signal with cyclic shift value a and symbol (-) in second time slot.BS can estimate first user's channel in the Calais mutually through the reference signal that will in second time slot, send and the reference signal of in first time slot, sending.And BS can be through deducting the channel that the reference signal of in second time slot, sending is estimated second user from the reference signal of first time slot, sending.That is, if use OCC, then BS can distinguish reference signal of being sent by first user and the reference signal of being sent by second user.Therefore, the amount of radio resource can double because of at least two users use different OCC when utilizing the same reference burst.

2) can use OCC, so that increase the interval between the cyclic shift value of a plurality of antennas distribute to unique user or a plurality of layers.Below, the cyclic shift value of distributing to a plurality of layers is described, but also can be used the cyclic shift value of distributing to a plurality of antennas.

Uplink reference signals is based on the cyclic shift value channel that is distinguished from each other.For a plurality of layers that in multiaerial system, are distinguished from each other, can different cyclic shift value be distributed to the reference signal to each layer.The quantity of the cyclic shift value of distributing must increase according to the increase of the number of plies, has reduced the interval between the cyclic shift value thus.Therefore, channel estimating performance reduces because of a plurality of channels that are difficult to be distinguished from each other.In order to address this problem, can use OCC to each layer.For example, suppose cyclic shift deviation 0,6,3,9 is distributed to the corresponding reference signal of four layers.Be spaced apart 3 between the cyclic shift value of the reference signal of equivalent layer.Interval between the cyclic shift value of reference signal that here, can be through symbol being applied to the 3rd layer and the 4th layer layer that makes antenna for the OCC of (-) increases to 6.Therefore, can increase performance for estimating channel.

3) can use OCC, so that increase the interval between the cyclic shift value of distributing to unique user.

In comprising a plurality of users' with a plurality of antennas MU-MIMO system, can OCC be applied to cyclic shift value.For example, the unique user angle from execution MIMO sends for a plurality of antennas or a plurality of layer of being distinguished from each other, can be applied in the cyclic shift value that has the distance interval between antenna or the layer.Yet from a plurality of users' angle, the cyclic shift interval between the user is constriction possibly.In order to address this problem, can use OCC.When using OCC, can between a plurality of users, use same cyclic shift value according to the type of OCC.

Figure 13 shows the example that OCC is applied to reference signal.

Reference signal sequence that is used for layer 0 in one sub-frame and the reference signal sequence that is used for layer 1 are mapped to the 4th SC-FDMA symbol of first time slot and the 4th SC-FDMA symbol of second time slot.Same sequence is mapped to two SC-FDMA symbols in each layer.Here, the reference signal sequence that is used for layer 0 multiply by orthogonal sequence [+1+1], maps to the SC-FDMA symbol then.The reference signal sequence that is used for layer 1 multiply by orthogonal sequence [+1-1], maps to the SC-FDMA symbol then.That is, when the reference signal sequence that will be used for layer 1 maps to second time slot in the sub-frame, reference signal sequence multiply by-1 mapping then.

If use OCC as stated, the BS that then receives reference signal can estimate the channel of layer 0 in the Calais mutually through reference signal sequence that will in first time slot, send and the reference signal sequence that in second time slot, sends.And BS can estimate the channel of layer 1 through deduct the reference signal sequence that in second time slot, sends from the reference signal sequence that first time slot, sends.That is, BS can be through using the reference signal that OCC is distinguished from each other and in equivalent layer, sends.Therefore, can utilize same asset to send a plurality of reference signals.The quantity of cyclic shift value if possible is 6, then can utilize OCC multiplexing layer or number of users can increase to 12.

In this example, suppose binary format [+1+1] or [+1-1] are used as OCC, but be not limited thereto, but can be with various orthogonal sequences as OCC.For example, can the orthogonal sequence such as Walsh sign indicating number, DFT coefficient and CAZAC sequence be applied to OCC.And, can have more easily multiplexing reference signal between the user of different bandwidth through using OCC.

Below, the method for the generation reference signal sequence that proposes is described.

As stated, can indicate in LTE version 8 whether reference signal sequence is carried out sequence set frequency hopping (SGH) by the signal that sends by the sub-district ad hoc fashion.Indicate whether below the sub-district signal specific of reference signal sequence execution SGH, to be known as the specific GH parameter in sub-district.Although LTE version 8UE and LTE-AUE coexist in a sub-district, it is identical in LTE version 8 and LTE-AUE whether reference signal sequence to be carried out SGH.Can carry out the SGH or the sequence hopping (SH) of current definition to each time slot.The specific GH parameter in sub-district can be to launch parameter by the more high-rise group frequency hopping that provides.The value of launching parameter when the group frequency hopping is a true time, carries out the SGH to reference signal sequence, but does not carry out SH.The value of launching parameter when the group frequency hopping is a fictitious time, does not carry out the SGH to reference signal sequence, and according to determining whether to carry out SH by the more high-rise specific SH parameter in sub-district of carrying out SH that indicates whether that provides.The specific SH parameter in this sub-district can be to launch parameter by the more high-rise sequence hopping that provides.

Simultaneously, in LTE-A, LTE version 8UE and LTE-AUE can carry out MU-MIMO and send, and perhaps LTE-A UE can carry out the MU-MIMO transmission.Here, for the MU-MIMO of the UE that supports to have different bandwidth sends, can use OCC.When using OCC, can improve the orthogonality between the UE that carries out the MU-MIMO transmission and can improve throughput.Yet; If UE has different bandwidth; And the specific GH in sub-district or SH parameter according to definition in LTE version 8 determine whether to carry out SGH or SH to reference signal sequence, then can not guarantee the orthogonality between the reference signal that each UE sends fully.

Figure 14 is that a plurality of UE utilize different bandwidth to carry out the example that MU-MIMO sends.In Figure 14 (a), a UE UE1 and the 2nd UE UE2 carry out same band.In this case, can determine whether to carry out SGH or SH according to the specific GH in sub-district or the SH parameter of definition in LTE version 8 to the basic sequence of reference signal.In Figure 14 (b), the bandwidth that a UE UE1 uses be the bandwidth used of the 2nd UE UE2 and the 3rd UE UE3 with.That is, a UE, the 2nd UE and the 3rd UE use different bandwidth.In this case, need utilize new method to determine whether basic sequence execution SGH or SH to the reference signal of each UE transmission.

Therefore, except the specific SH parameter of specific GH parameter in existing sub-district and existing sub-district, can also the specific SGH parameter of redetermination UE.The specific SGH parameter of UE is the information that is used for particular UE, and can only be sent to this particular UE.The specific SGH parameter of this UE can be applied to the DMRS that utilizes the PUSCH resource transmission of distributing to particular UE.That is, the specific SGH parameter of this UE can indicate whether to carry out SGH/SH to the basic sequence of the DMRS that utilizes the PUSCH resource to send.For ease of following description, only describe to the basic sequence execution SGH of reference signal and the example of SH, but be not limited thereto determining whether by the specific SGH parameter of UE.Can determine whether basic sequence application of SH by the UE specific SH parameter different with the specific SGH parameter of UE to reference signal.And, described the example that the present invention is applied to the basic sequence of the DMRS that utilizes the transmission of PUSCH resource, but be not limited thereto.The present invention can also be applied to by variety of way and utilize DMRS that the PUCCH resource sends, SRS etc.And, supposed that wherein a plurality of UE have the MU-MIMO environment of different bandwidth, but the present invention can be applied to MU-MIMO or SU-MIMO environment that wherein a plurality of UE have same band.

When the value of specific GH parameter in sub-district or the specific SH parameter in sub-district is when very thus the basic sequence of reference signal being carried out SGH or SH, to DMRS that utilizes the PUSCH resource and timeslot-level SGH or the SH of the common execution of DMRS that utilizes the PUCCH resource and STS.That is, the sequence set index of the basic sequence of reference signal (or number) changes to each time slot, and perhaps basic sequence index (or number) changes in sequence set.Here, can indicate whether to carry out SGH or SH with the specific SGH parameter of UE once more to the DMRS that utilizes the PUSCH resource.In other words, the specific SGH parameter of UE has precedence over the specific SGH parameter of specific GH parameter in sub-district or sub-district.The specific SGH parameter of UE can be a forbidding sequence set frequency parameter.That is,, then can not carry out SGH and SH if the value of the specific SGH parameter of UE is true, and irrelevant with the specific SH parameter of specific GH parameter in sub-district or sub-district.More particularly, when the value of the specific SGH parameter of UE is a true time,, can not carry out SGH and SH to the basic sequence of reference signal although specific GH parameter in sub-district or sub-district specific SH parameter pointer are carried out SGH or SH to the basic sequence of reference signal.If do not carry out SGH, then the sequence set index of the basic sequence of reference signal can not change to each time slot.And, as under the situation of the specific GH parameter execution SGH through the sub-district, because do not carry out SH, so the basic sequence index of the basic sequence of reference signal does not change to each time slot.Here, two time slots in the subframe send the basic sequence of the reference signal with basic sequence index (like the identical sequence group index), because only in a sub-frame, do not carry out SGH and SH, but can between subframe, use SGH or SH.Alternatively, because in all subframes, do not use SGH and SH, so all time slots can send the basic sequence of the reference signal with identical sequence group index and identical basic sequence index.Simultaneously, when the value of the specific SGH parameter of UE is a fictitious time, can carry out SGH or SH according to the specific SH parameter of specific GH parameter in sub-district or sub-district to the basic sequence of reference signal.

Figure 15 is an example of not carrying out SGH and SH according to the specific SGH parameter of the UE that is proposed.With reference to Figure 15, when in LET version 8 or 9, carrying out SGH and SH, the sequence set index of the basic sequence of the reference signal of in each time slot, sending or basic sequence index are different.Method 1 is wherein in a subframe, not carry out the situation of SGH and SH according to the specific SGH parameter of UE.Two time slots in each subframe generate the basic sequences of the reference signal with identical sequence group index and identical basic sequence index, and sequence set index or basic sequence index change between subframe.Method 2 is wherein in all subframes, not carry out the situation of SGH and SH according to the specific SGH parameter of UE.Therefore, all subframes generate the basic sequence of the reference signal with identical sequence group index and identical basic sequence index.

Figure 16 is the execution mode of the method for the generation reference signal sequence that proposes.

At step S100, UE receives the specific SGH parameter of UE.The specific SGH parameter of UE can be provided by high level more.At step S110, UE generates reference signal sequence to each time slot based on basic sequence.Basic sequence can according to by the specific SGH parameter of UE that indicates whether to carry out SGH and SH to each time slot and definite sequence group number and basic sequence number are classified.

Can utilize following the whole bag of tricks whether to carry out SGH and SH according to the specific SGH parameter of UE to the UE notice.

1) is included in the effect that the frequency hopping sign that is used for the DCI form that up link sends can play the specific SGH parameter of UE.For example, if launch frequency hopping, then can carry out timeslot-level SGH or SH through the frequency hopping sign.And, if forbid frequency hopping, then can not carry out SGH and SH to the basic sequence of the DMRS that utilizes the PUSCH resource through the frequency hopping sign.Alternatively, can carry out SGH or SH to each subframe.

2) can indicate whether to carry out SGH and SH with the masking information of carrying out SGH and SH to the basic sequence of reference signal that indicates whether that indication is included in the bit of the UE ID that is used for the DCI form that up link sends.

3) when appointment is included in the particular index of the cyclic shift designator that is used for the DCI form that UL sends, can indicate whether to carry out SGH and SH to the basic sequence of reference signal.

4) can comprise the specific SGH parameter of UE that indicates whether to carry out SGH and SH at the DCI form that is used for the UL transmission to the basic sequence of reference signal.

5) can the specific SGH parameter of UE be sent to particular UE through more high-level signaling to particular UE.

6) if use the DFT-s OFDM delivery plan of sub-clustering, then can not carry out SGH and SH to the basic sequence of reference signal.

Simultaneously, when not carrying out according to the specific SGH parameter of UE, can OCC be applied to the coherent reference signal to the SGH of the basic sequence of reference signal and SH.If carry out SGH or SH, then can not use OCC to the basic sequence of reference signal.

Can use several different methods to indicate whether to use OCC.At first; When indicating the cyclic shift index through the DCI form; And send when indicating whether to use the OCC index of OCC through more high-rise,, then can use steadily whether according to OCC indexes applications OCC if do not carry out SGH and SH to the basic sequence of reference signal.For example,, then can not use OCC if the OCC index is 0, and if the OCC index is 1, then can use OCC.Alternatively,, then can not use OCC if the OCC index is 1, and if the OCC index is 0, then can use OCC.And, if carry out SGH or SH, then can determine whether to use OCC by the mode opposite with the OCC index to the basic sequence of reference signal.For example,, then can use OCC if the OCC index is 0, and if the OCC index is 1, then can not use OCC.Alternatively,, then can use OCC if the OCC index is 1, and if the OCC index is 0, then can not use OCC.

Alternatively, can not define the OCC index that indicates whether to use OCC individually, but can indicate specific OCC, thereby specific OCC is applied to the particular cyclic shift index through the cyclic shift index and the OCC index of combination 3 bits in the DCI form.Here, if carry out the SGH to the basic sequence of reference signal, then the OCC index by the indication of associated cyclic displacement index can reverse once more, thereby does not use OCC.And, if do not carry out SGH and SH, then can utilize steadily by the OCC index of associated cyclic displacement index indication and use OCC to the basic sequence of reference signal according to the specific SGH parameter of UE.Therefore, can reduce interference between the reference signal of distributing to each layer.

In the superincumbent description, to wherein determining whether that by the specific SGH parameter of UE the example of carrying out SGH and SH to the basic sequence of reference signal is described.Yet in the MU-MIMO environment, the orthogonality between the reference signal that further guarantees UE can further define the new argument that indicates whether to carry out SH.The new argument that indicates whether to carry out SH can be the specific SH parameter of UE.The specific SH parameter of this UE can be utilized with the identical method of the specific SGH parameter of UE and use.That is, the specific SH parameter of UE can have precedence over the specific SH parameter in sub-district.The specific SGH parameter of above-mentioned UE can only determine whether to carry out SGH.That is,, do not carry out SGH to the basic sequence of reference signal when the value of the specific SGH parameter of UE is a true time.And, determine whether to carry out SH by the specific SH parameter of UE to the basic sequence of reference signal.When the value of the specific SH parameter of UE is a true time, do not carry out SH to the basic sequence of reference signal.When the value of the specific SH parameter of UE is a fictitious time, can determine whether to carry out SH by the specific SH parameter in sub-district to the basic sequence of reference signal.Can utilize signaling impliedly or clearly dynamically to signal the specific SH parameter of UE through PDCCH, perhaps can impliedly or clearly provide the specific SH parameter of UE by more high-rise (like the RRC signaling).

Simultaneously, in the superincumbent description, described that the specific SGH parameter of UE, the specific GH parameter of UE or the specific SH parameter of UE have precedence over the specific SH parameter of specific GH parameter in sub-district or sub-district and irrelevant, but can change according to sending mode with the UL sending mode.In LTE version 8/9, support the individual antenna sending mode basically.Yet in LTE-A, the efficient for UL sends can define many antenna transmission pattern, be used for the sending mode of discontinuous distribution etc.Here, can determine whether to carry out the specific SGH parameter of UE, the specific GH parameter of UE or the specific SH parameter of UE according to sending mode.For example; In the individual antenna sending mode; Although the specific SGH parameter of UE has precedence over the specific SH parameter of specific GH parameter in sub-district or sub-district, can determine whether to carry out SGH or SH by the specific SH parameter of specific GH parameter in sub-district or sub-district to the basic sequence of reference signal.

Figure 17 illustrates the BS of realization execution mode of the present invention and the block diagram of UE.

BS 800 comprises: processor 810, memory 820 and radio frequency (RF) unit 830.Function, processing and/or method that processor 810 realizations are proposed.A plurality of layers of Radio interface protocols can be realized through processor 810.Memory 820 is coupled to processor 810, and its storage is used to drive the various information of processor 810.RF unit 830 is coupled to processor 810, and it sends the specific SGH parameter of UE to UE.

UE 900 comprises: processor 910, memory 920 and RF unit 930.RF unit 930 is coupled to processor 910, and it receives the specific SGH parameter of UE.Function, processing and/or method that processor 910 realizations are proposed.A plurality of layers of Radio interface protocols can be realized through processor 910.Processor 910 is configured to generate reference signal sequence to each time slot based on basic sequence.Basic sequence according to by the specific SGH parameter of UE that indicates whether to carry out SGH to each time slot and definite sequence group number and basic sequence number are classified.Memory 920 is coupled to processor 910, and its storage is used to drive the various information of processor 910.

Processor 810,910 can comprise application-specific integrated circuit (ASIC) (ASIC), other chipset, logical circuit with and/or data processing equipment.Memory 820,920 can comprise: read-only memory (ROM), random-access memory (ram), flash memory, storage card, storage medium with and/or other storage device.RF unit 830,930 can comprise the baseband circuit that is used to handle radiofrequency signal.When realizing execution mode, can utilize the module (for example, process, function etc.) of carrying out function described here to realize technology described here with software.These modules can be stored in the memory 820,920, and carry out through processor 810,910.Memory 820,920 can be realized in processor 810,910, perhaps is in processor 810,910 outsides, and in this case, memory can be coupled to processor 810,910 with communication mode via variety of way known in the art.

About example system described here, the several flow charts of reference are to being described according to the method that disclosed theme is realized.Though from the purpose of simplifying; Method is illustrated and is described as series of steps or frame; But understand and be clear that; Theme required for protection is not limited by the order of these steps or frame, can occur or occur simultaneously with other step of describing at this and describe by different order like some steps.And, it will be appreciated by those skilled in the art that illustrative step is not exclusive in the flow chart, but under the situation that does not influence the scope of the present disclosure and spirit, can comprise other step, perhaps can delete one or more step in the example flow diagram.

Above the described example that comprises various aspects.Certainly, can not describe each combination imagined of a plurality of assemblies or method, but one skilled in the art will recognize that many further combinations and displacement all are fine from the purpose of describing various aspects.Therefore, this specification is intended to contain spirit and interior all these change examples, modification and the modified example of scope that falls into appended claims.

Claims (15)

1. method that in wireless communication system, generates reference signal sequence by subscriber equipment (UE), said method comprises:

Receive UE particular sequence group frequency hopping (SGH) parameter to the UE appointment; And

Generate reference signal sequence to each time slot based on basic sequence,

Wherein, said basic sequence according to by the specific SGH parameter of UE that indicates whether to carry out SGH to each time slot and definite sequence group number and basic sequence number are classified.

2. method according to claim 1, wherein, the specific SGH parameter of said UE is through more high-rise transmission.

3. method according to claim 1, wherein, said reference signal sequence is to use the sequence of the demodulated reference signal (DMRS) of physical uplink link sharing channel (PUSCH) resource and restituted signal.

4. method according to claim 1, wherein, when the indication of the specific SGH parameter of said UE was not carried out SGH, the interior basic sequence of the sequence group number of the time slot in the sub-frame and sequence set was number mutually the same.

5. method according to claim 1, wherein, when sequence hopping (SH) was not carried out in the indication of the specific SGH parameter of said UE, the interior basic sequence of the sequence group number of the time slot in the sub-frame and sequence set was number mutually the same.

6. method according to claim 1, wherein, when the specific SGH parameter indication of said UE was not carried out SGH, the sequence group number of all time slots in the frame was mutually the same.

7. method according to claim 1, said method also comprises: reception indicates whether to carry out the specific SGH parameter in sub-district of SGH, or indicates whether to carry out the specific SH parameter in sub-district of SH.

8. method according to claim 7, wherein, when SGH was carried out in the indication of the specific GH parameter in sub-district, the specific SGH parameter of said UE had precedence over the specific SGH parameter in said sub-district aspect the SGH indicating whether to carry out.

9. method according to claim 7, wherein, when SH was carried out in the indication of the specific SH parameter in said sub-district, the specific SGH parameter of said UE had precedence over the specific SH parameter in said sub-district aspect the SH indicating whether to carry out.

10. method according to claim 1, said method also comprises: send said reference signal sequence through said reference signal sequence is mapped to subcarrier.

11. method according to claim 1, wherein, said reference signal sequence also generates based on cyclic shift.

12. method according to claim 1, wherein, said basic sequence is based on Zadoff-Chu (ZC) sequence.

13. method according to claim 1, wherein, quadrature overlay code (OCC) is applied to said reference signal sequence.

14. method according to claim 13 wherein, is used through the more high-rise OCC index that sends to indicate whether to use OCC.

15. a device that is used to generate reference signal sequence, this device comprises:

Radio frequency (RF) unit, this radio frequency (RF) unit is configured to receive subscriber equipment (UE) particular sequence group frequency hopping (SGH) parameter; With

Processor, this processor is coupled to the RF unit, and is configured to generate burst to each time slot based on basic sequence,

Wherein, said basic sequence according to by the specific SGH parameter of UE that indicates whether to carry out SGH to each time slot and definite sequence group number and basic sequence number are classified.

Images