CN102696193B - The method and apparatus generating reference signal sequence in a wireless communication system - Google Patents

Abstract

The invention provides the method and apparatus that one is generated reference signal sequence by subscriber equipment (UE) in a wireless communication system.UE receives UE particular sequence group frequency hopping (SGH) parameter specific to its own, and generates reference signal sequence based on basic sequence in each slot unit.Basic sequence is divided into the sequence group number and basic sequence number determined in each slot unit by the UE indicating whether to have performed SGH specific SGH parameter.

Description

The method and apparatus generating reference signal sequence in a wireless communication system

Technical field

The present invention relates to radio communication, more particularly, to the side generating reference signal sequence in a wireless communication system Method and device.

Background technology

Multiple-input and multiple-output (MIMO) technology can be used for raising and utilize multiple transmission antenna and multiple reception antenna Data send and receive efficiency.MIMO technology may include that space-frequency block codes (SFBC), space-time block code (STBC), cyclic delay diversity (CDD), frequency error factor launch diversity (FSTD), time-switching transmitting diversity (TSTD), precoding vectors switching (PVS), spatial reuse (SM) are to realize diversity.According to reception antenna number The mimo channel matrix of amount and transmission antenna quantity can be broken down into multiple independent channel.Each independent channel All it is referred to as layer or stream.The quantity of layer is referred to as order (rank).

In a wireless communication system, for sending and receive data, obtaining system synchronization and the mesh of feedback channel information , it is necessary to estimating uplink channel or downlink channel.In wireless communication system environments, because of multi path time Postpone and produce decline.Come extensive by compensating the distorted signals being caused change suddenly in environment by this decline thus produce The process of the recurrence number of delivering letters is referred to as channel and estimates.For the community belonging to subscriber equipment or other community, also The state of channel must be measured.For estimating channel or measuring the state of channel, it is possible to use to transmitters and receivers Reference signal known to Yan Jun (RS).

It is referred to as reference signal subcarrier for sending the subcarrier of this reference signal, and for sending the subcarrier of data It is referred to as data subcarrier.In an ofdm system, the method for assignment reference signal includes: refer to all subcarriers The method joining reference signal and the method assigning reference signal between data subcarrier.Utilize and only include reference signal Signal (such as targeting signal) performs the method to all subcarriers assignment reference signal, in order to obtain what channel was estimated Handling capacity.If making in this way, then because the density of reference signal is generally the highest, thus with at data subcarrier Between assign the method for reference signal and compare, the performance that channel is estimated can be improved.But, because to all subcarriers The method of assignment reference signal sending data volume less, between data subcarrier, assigning reference signal so using Method, in order to increase and send data volume.If use between data subcarrier, assign reference signal method, then because of Density for reference signal is relatively low, so the performance that channel is estimated may deterioration.Therefore, it should reference is suitably set Signal, in order to minimize this deterioration.

Receptor can estimate channel, because it is known by separating the information about reference signal from received signal Road is about the information of reference signal, and by the channel value estimated by compensation, receptor can accurately be estimated to send The data that stage sends.Assume that the reference signal that transmitter sends is p, the letter that reference signal is experienced during sending Road information is h, and the thermal noise occurred in receptor is n, and receptor received signal is y, it can be deduced that y=h p+n. Here, because already known reference signal p of receptor, so in the case of using least square (LS) method, it Equation 1 can be utilized to carry out estimating channel information value

[equation 1]

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

Utilize the channel estimation value that reference signal p is estimated Precision by being worth Determine.For accurately estimated value h, Value 0 must be converged on.For that purpose it is necessary to by utilizing substantial amounts of reference signal to estimate, signal minimizes value Shadow Ring.The many algorithms for more preferable channel estimating performance can be there is.

In order to minimize the presence of intercell interference (ICI) when sending reference signal, can be to reference signal sequence application sequence Group frequency hopping (SGH) or sequence hopping (SH).When applying SGH, the reference letter sent in each time slot The sequence set index of number sequence can change.

In multi-user (MU) MIMO environment, orthogonal in order to ensure between the reference signal that multiple UE sends Property, it is possible to use orthogonal covering codes (OCC).When applying OCC, it is ensured that orthogonality and the improvement of handling capacity. Meanwhile, in MU-MIMO environment, multiple UE can use different bandwidth.If for having different bandwidth The reference signal that sends of multiple UE perform to apply while SCH OCC, then add the complexity of plot planning. I.e., it is difficult to ensure the orthogonality between the reference signal that multiple UE sends.

Accordingly, it would be desirable to be carried out SGH for instruction for reference signal sequence be also carried out the another kind of method of SH.

Summary of the invention

Technical problem

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

Technical scheme

On the one hand, it is provided that one is generated reference signal sequence by subscriber equipment (UE) in a wireless communication system Method.Described method includes: receive UE particular sequence group frequency hopping (SGH) parameter specified for UE；And Generating reference signal sequence for each time slot based on basic sequence, wherein, described basic sequence is according to by indicating Whether perform sequence group number that the UE specific SGH parameter of SGH determines for each time slot and basic sequence number comes Classification.

Described UE specific SGH parameter can be sent by higher.

Described reference signal sequence can be to use physical uplink link shared channels (PUSCH) resource and demodulate The sequence of the demodulated reference signal (DMRS) of signal.

When described UE specific SGH parameter instruction do not perform SGH time, the sequence group number of the time slot in a subframe with Basic sequence number in sequence set can be mutually the same.

When the instruction of described UE specific SGH parameter does not perform sequence hopping (SH), the time slot in a subframe Sequence group number can be mutually the same with the basic sequence number in sequence set.

When the instruction of described UE specific SGH parameter does not performs SGH, the sequence group number of all time slots in a frame can With mutually the same.

Described method can also include: receives the community specific SGH parameter indicating whether to perform SGH, or instruction is The community specific SH parameter of no execution SH.When specific GH parameter instruction in community performs SGH, described UE is special Determine SGH parameter and can have precedence over described community specific SGH parameter in terms of indicating whether to perform SGH.When described When community specific SH parameter instruction performs SH, described UE specific SGH parameter is in terms of indicating whether to perform SH Described community specific SH parameter can be had precedence over.

Described method also includes: send described reference signal sequence by described reference signal sequence maps to subcarrier Row.

Described reference signal sequence is also based on cyclic shift and generates.

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

Orthogonal covering codes (OCC) can be applied to described reference signal sequence.Can be with being sent by higher OCC index indicates whether to apply OCC.

On the other hand, it is provided that a kind of device for generating reference signal sequence.Described device includes: radio frequency (RF) unit, is configured to receive subscriber equipment (UE) particular sequence group frequency hopping (SGH) parameter, and processes Device, coupled to RF unit, and is configured to each time slot and generates signal sequence based on basic sequence, its In, described basic sequence is according to by indicating whether that the UE specific SGH parameter performing SGH is for each time slot The sequence group number and the basic sequence number that determine are classified.

Beneficial effect

In MU-MIMO environment, it is ensured that utilize the orthogonality between multiple UE of different bandwidth.

Accompanying drawing explanation

Fig. 1 shows wireless communication system.

Fig. 2 shows the structure of the radio frame in 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 SC-FDMA system.

Fig. 7 shows that complex-valued symbol is mapped to the example of the scheme of the corresponding subcarrier of frequency domain by subcarrier mapper.

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

Fig. 9 shows the example of the subframe for sending reference signal.

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

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

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

Figure 13 shows the example to reference signal application OCC.

Figure 14 is that multiple UE utilizes different bandwidth to perform the example that MU-MIMO sends.

Figure 15 is the example not performing SGH and SH according to the UE proposed specific SGH parameter.

Figure 16 is the embodiment of the method generating reference signal sequence proposed.

Figure 17 is the block diagram illustrating BS and UE realizing embodiments of the present invention.

Detailed description of the invention

Following technology may be used for various wireless communication system, as CDMA (CDMA), frequency division multiple access (FDMA), Time division multiple acess (TDMA), OFDM (OFDMA), single-carrier frequency division multiple access (SC-FDMA) etc.. CDMA can be implemented as such as Universal Terrestrial radio and accesses (UTRA) or the radiotechnics of CDMA 2000. TDMA can be implemented as such as global system for mobile communications (GSM)/general packet radio service (GPRS)/ The radiotechnics of enhanced data rates for gsm evolution (EDGE).OFDMA can by such as electrically and Electronic Engineering Association (IEEE) 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, E-UTRA(evolution UTRA) etc. radiotechnics realize.IEEE 802.16m(IEEE 802.16e drills Enter) provide backward compatibility to system based on IEEE 802.16e.UTRA is Universal Mobile Telecommunications System (UMTS) A part.3GPP(third generation partner program) LTE(Long Term Evolution) it is the evolution utilizing E-UTRA UMTS(E-UMTS) a part, it uses OFDMA to use in the uplink in the downlink SC-FDMA.LTE-A(is advanced) it is the evolution of 3GPP LTE.

Below, for the sake of clarification, mainly LTE-A will be described, but the technological concept of the present invention is not limited to this.

Fig. 1 shows wireless communication system.

Wireless communication system 10 includes at least one base station (BS) 11.Each BS 11 to specific geographical area 15a, The so-called community of 15b, 15c() communication service is provided.Each community may be divided into multiple region and (claims Make sector).Subscriber equipment (UE) 12 can be fixing or movement, and can be referred to as other name, as MS(movement station), MT(mobile terminal), UT(user terminal), SS(subscriber station), wireless device, PDA (personal digital assistant), radio modem, handheld device.It is fixing that BS 11 is often referred to communicate with UE 12 Stand, and other name can be referred to as, such as eNB(evolution NodeB), the basic transceiver system of BTS(), connect Access point (AP) etc..

In general, UE belongs to a community, and the community belonging to UE is referred to as Serving cell.To Serving cell The BS providing communication service referred to as services BS.This wireless communication system is cellular system, thus exists and clothes The different districts that business community is adjacent.The different districts adjacent with Serving cell is referred to as neighbor cell.There is provided to neighbor cell The BS of communication service is referred to as neighbor bss.Serving cell and neighbor cell relatively determine based on UE.

This technology may be used for downlink or up-link.In general, downlink refers to from BS 11 to UE 12 Communication, and up-link refers to the communication from UE 12 to BS 11.In the downlink, transmitter can conduct A part of BS 11, and receptor can be as a part of UE 12.In the uplink, transmitter can be made For a part of UE 12, and receptor can be as a part of BS 11.

This wireless communication system can be multiple-input and multiple-output (MIMO) system, multiple input single output (MISO) Any one in system, single-input single-output (SISO) system and single input and multi-output (SIMO) system.MIMO System uses multiple transmission antennas and multiple reception antenna.MISO system uses multiple transmission antennas and single reception sky Line.SISO system uses single transmission antenna and single reception antenna.SIMO system use single transmission antenna and Multiple reception antennas.Below, transmission antenna refers to the physically or logically antenna for sending signal or stream, and reception antenna Refer to the physically or logically antenna for receiving signal or stream.

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

It is referred to for 3GPP(third generation partner program) TS 36.211 V8.2.0(2008-03) “Technical Specification Group Radio Access Network;Evolved Universal Terrestrial Radio Access(E-UTRA);Physical channels and modulation (Release 8) " paragraph 5.Reference Fig. 2, radio frame includes that 10 subframes, a subframe include two time slots.Time slot #0 in this radio frame Number to #19.The time spent for sending a subframe is referred to as transmission time interval (TTI).TTI can be The thread sent for data.Such as, a radio frame can have the length of 10ms, and a subframe can have There is the length of 1ms, and a time slot can have the length of 0.5ms.

One time slot includes multiple OFDMs (OFDM) symbol in time domain and the multiple subcarriers in frequency domain. Because 3GPP LTE uses OFDMA in the downlink, so OFDM symbol is used for representing the symbol period.Root According to Multiple Access scheme, OFDM symbol can be referred to as other name.Such as, when using single-carrier frequency division multiple access (SC-FDMA), time as uplink multiple access scheme, OFDM symbol can be referred to as SC-FDMA symbol.Money Source block (RB) (resource allocation unit) includes the multiple continuous subcarrier in time slot.The structure of this radio frame is only It it is an example.That is, the quantity or one of the time slot that the quantity of subframe that one radio frame includes, a subframe include The quantity of the OFDM symbol that time slot includes can change.

3GPP LTE defines: a time slot includes seven OFDM symbol in normal cyclic prefix (CP), and One time slot includes six OFDM symbol at extension CP.

Wireless communication system can be divided into FDD (FDD) scheme and time division duplex (TDD) scheme.Root According to FDD scheme, at different frequency bands, carry out up-link send and downlink transmission.According to TDD scheme, Same frequency band carries out up-link and sends and downlink transmission during being in different periods.The channel of TDD scheme rings Should be substantially reciprocal.This means downlink channel response and uplink response almost phase in allocated frequency band With.Thus, being advantageous in that of wireless communication system based on TDD, can be according to uplink channel responses Obtain downlink channel response.In TDD scheme, whole frequency band sends and downlink for up-link Transmission is carried out the time-division, thus the downlink that can simultaneously perform BS sends and the up-link of UE sends.At it Middle up-link sends and downlink sends and presses in the TDD system that subframe unit is distinguished, and performs in different subframes Up-link sends and downlink sends.

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

Downlink time slots includes the multiple OFDM symbol in time domain and the N in frequency domain_RBThe Resource Block of quantity (RB).The N of the Resource Block being included in downlink time slots_RBQuantity depends on that the downlink arranged in community is sent out Send bandwidth.Such as, in LTE system, N_RBCan be any one in 60 to 110.One Resource Block includes Multiple subcarriers in frequency domain.Uplink time slot can have the structure identical with downlink time slots.

Each unit on resource grid is referred to as Resource Unit.In a slot, can be with index of reference to (k l) comes Distinguish the Resource Unit on resource grid.Here, k(k=0 ..., N_RB× 12-1) it is the sub-carrier indices in frequency domain, And l is the OFDM symbol index in time domain.

Here, include by seven OFDM symbol in time domain and 12 sons in frequency domain exemplified with a Resource Block 7 × 12 Resource Units that carrier wave is constituted, but the quantity of the quantity of the OFDM symbol in Resource Block and subcarrier does not limits In this.The quantity of OFDM symbol and the quantity of subcarrier can be according between the length of Cyclic Prefix (CP), frequencies Change every waiting.Such as, when normal CP for, the quantity of OFDM symbol is 7, and for extension CP Situation for, the quantity of OFDM symbol is 6.128, in 256,512,1024,1536 and 2048 The quantity of one subcarrier that can selectively act as in an OFDM symbol.

Fig. 4 shows the structure of downlink subframe.

In the time domain, downlink subframe includes two time slots, and in normal CP, each time slot includes seven OFDM symbol.First three OFDM symbol of the first time slot in subframe (carries a width of maximum four for 1.4MHz Individual OFDM symbol) corresponding to being assigned with the control zone controlling channel, and other residue OFDM symbol is corresponding to dividing Join the data field of physical down link sharing channel (PDSCH).

PDCCH can deliver the transmission form of downlink sharied signal channel (DL-SCH) and resource distribution, up The resource allocation information of link shared channels (UL-SCH), the paging information about PCH, relevant DL-SCH System information, via PDSCH send such as accidental access response higher control message resource distribution, One group of transmission power control order, internet protocol voice (VoIP) for each UE in a particular UE group Activation etc..Multiple PDCCH can be sent in control zone, and UE can monitor multiple PDCCH.PDCCH It is transmitted in multiple continuous control Channel Elements (CCE) one or polymerization.CCE is according to wireless communication The logical allocation unit that the state in road provides encoding rate and uses.CCE corresponds to multiple resource element groups.PDCCH Form and the encoding rate that provides with CCE according to the quantity of CCE of the available bit number of PDCCH between associate System determines.

BS is according to determine PDCCH form to the DCI that UE sends, and by Cyclic Redundancy Check It is attached to DCI.Owner or purpose according to PDCCH are sheltered unique radio net on CRC and are marked temporarily Know symbol (RNTI).For when for the PDCCH of particular UE, can shelter UE's on CRC Unique identifier (such as, community RNTI(C-RNTI).Or, for the PDCCH's for beep-page message For situation, paging indicator identifiers (such as, paging RNTI(P-RNTI) can be sheltered on CRC).Right For the situation for the PDCCH of system information block (SIB), can on CRC masking system message identification Symbol (such as, system information RNTI(SI-RNTI)).In order to indicate accidental access response, i.e. for sending UE The response of random access guiding, Stochastic accessing RNTI(RA-RNTI can be sheltered on CRC).

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

In a frequency domain, uplink sub-frames can be divided into control zone and data field.For sending up-link control The physical uplink control channel (PUCCH) of information is assigned to control zone.For sending data physically Ink Shared Channel (PUSCH) is assigned to data field.If higher indicates, then subscriber equipment can prop up Send while holding PUCCH and PUSCH.

PUCCH for a UE presses RB to distribution.Belong to this RB of RB couple at the first time slot and second Each time slot in time slot takies different subcarriers.Belong to shared by the RB of RB couple that distributes to PUCCH Frequency change at boundary of time slot.This is referred to as the RB distributing to PUCCH at hopped at slot boundaries. Because UE sends UL over time by different sub carrier controls information, it is possible to obtain frequency diversity gain. In the figure, m is that the RB of the PUCCH location index to the logic frequency domain position in subframe is distributed in instruction.

The uplink control information sent on PUCCH may include that HARQ ACK/NACK, indicating downlink The CQI (CQI) of the state of link channel, tune as uplink radio resource allocation request Degree request (SR) etc..

PUSCH is mapped to uplink shared channel (UL-SCH) (transmission channel).PUSCH sends Uplink data can be transmission block (data block of UL-SCH for sending during TTI).Transmission block Can be user profile.Or, uplink data can be multiplex data.This multiplex data can be to pass through multiplexing The data obtained for transmission block and the control information of UL-SCH.Such as, multiplexing is permissible to the control information of data Including: CQI, precoding matrix indicators (PMI), HARQ, order designator (RI) etc..Or, uplink Circuit-switched data can only include control information.

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

With reference to Fig. 6, transmitter 50 includes: discrete Fourier transform (DFT) (DFT) unit 51, subcarrier mapper 52, Fast Flourier inverse transformation (IFFT) unit 53 and Cyclic Prefix (CP) insert unit 54.Transmitter 50 can To include: scrambling unit (not shown), modulation mapper (not shown), layer mapper (not shown) and layer are handed over Parallel operation (not shown), they can be placed on before DFT unit 51.

DFT unit 51 exports complex-valued symbol by incoming symbol is performed DFT.Such as, when Ntx symbol of input Time number (wherein, Ntx is natural number), DFT size is Ntx.DFT unit 51 can be referred to as conversion and prelist Code device.Complex-valued symbol is mapped to the corresponding subcarrier of frequency domain by subcarrier mapper 52.This complex-valued symbol can be reflected It is incident upon and distributes the corresponding Resource Unit of Resource Block sent for data.Subcarrier mapper 52 can be referred to as Resource unit mapping device.The base band that IFFT unit 53 exports for data by incoming symbol performs IFFT is believed Number (that is, time-domain signal).CP insertion unit 54 replicates some of the rear portion of the baseband signal for data, and will The front portion being inserted partially into the baseband signal for data replicated.Because being inserted by CP and preventing intersymbol interference (ISI) and inter-carrier interference (ICI), even if so orthogonality can also be maintained in multipath channel.

Fig. 7 shows that complex-valued symbol is mapped to the example of the scheme of the corresponding subcarrier of frequency domain by subcarrier mapper.Ginseng According to Fig. 7 (a), the complex-valued symbol exported from DFT unit is mapped to son adjacent to each other in frequency domain by subcarrier mapper Carrier wave." 0 " is inserted in the subcarrier not mapping complex-valued symbol.This mapping that referred to as localizes.At 3GPP LTE In system, use localization mapping scheme.With reference to Fig. 7 (b), subcarrier mapper every two from DFT unit The adjacent complex-valued symbol of output inserts " 0 " (L is natural number) of (L-1) quantity.That is, will be defeated from DFT unit The complex-valued symbol gone out maps to the subcarrier being distributed in a frequency domain by equal intervals.This is referred to as distributed mapping.If Subcarrier mapper uses the localization mapping scheme such as Fig. 7 (a) or the distributed mapping scheme such as Fig. 7 (b), Then maintain single-carrier property.

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

With reference to Fig. 8, reference signal transmitter 60 includes: subcarrier mapper 61, IFFT unit 62 and CP Insert unit 63.It is different from the transmitter 50 of Fig. 6, in reference signal transmitter 60, generates the most in a frequency domain Reference signal, without through DFT unit 51, then maps to subcarrier by subcarrier mapper 61.This In, 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 for sending reference signal.The structure of the subframe in Fig. 9 (a) shows The situation of normal CP.This subframe includes the first time slot and the second time slot.Each in first time slot and the second time slot All include 7 OFDM symbol.14 OFDM symbol in this subframe are assigned notation index 0 to 13 respectively. Reference signal can be sent by the OFDM symbol with notation index 3 and 10.This reference signal can utilize One sequence sends.Can be by Zadoff-Chu(ZC) sequence be used as reference signal sequence.Can index according to root Multiple ZC sequence is generated with cyclic shift value.BS can by difference cyclic shift value is distributed to multiple UE, The channel of these UE is estimated by orthogonal sequence or quasi orthogonal sequences.In reference signal subframe in a frequency domain two The position taken in time slot can be mutually the same or different from each other.In the two time slot, use same reference signal Sequence.Number can be sent by the residue SC-FDMA symbol outside the SC-FDMA symbol of transmission reference signal According to.The structure of the subframe in Fig. 9 (b) shows the situation of extension CP.This subframe includes the first time slot and when second Gap.Each in first time slot and the second time slot includes 6 SC-FDMA symbols.In this subframe 12 SC-FDMA symbol is assigned notation index 0 to 11.By having the SC-OFDM symbol of notation index 2 and 8 Send reference signal.Come by the residue SC-FDMA symbol outside the SC-FDMA symbol of transmission reference signal Send data.

Although Fig. 9 is not shown, detection reference signal (SRS) can be sent by the OFDM symbol in this subframe. The reference signal that SRS sends to BS from UE, dispatches for UL.BS estimates UL by received SRS Channel, and use estimated UL channel in UL dispatches.

The DFT-s OFDM delivery plan of sub-clustering is the revision of existing SC-FDMA delivery plan, is pre-by standing The data symbol of encoder is divided into multiple sub-block, separates these sub-blocks and map the side of these sub-blocks in a frequency domain Method.

Figure 10 shows an example of the transmitter of the DFT-s OFDM delivery plan utilizing sub-clustering.With reference to Figure 10, Transmitter 70 includes: DFT unit 71, subcarrier mapper 72, IFFT unit 73 and CP insert unit 74. Transmitter 70 can also include: scrambling unit (not shown), modulation mapper (not shown), layer mapper are (not Illustrate) and layer exchanger (not shown), they can be placed on before DFT unit 71.

It is divided into N number of sub-block (N is natural number) from the complex-valued symbol of DFT unit 71 output.This N number of sub-block Sub-block #1, sub-block #2 ..., sub-block #N can be used to represent.Subcarrier mapper 72 is distributed this N in a frequency domain Individual sub-block, and this N number of sub-block is mapped to subcarrier.NULL can be inserted every two adjacent sub-blocks.One Complex-valued symbol in individual sub-block can map to subcarrier the most adjacent to each other.I.e., it is possible in a sub-block Use localization mapping scheme.

The transmitter 70 of Figure 10 can be used in SCPC transmitter or multicarrier transmitter.If transmitter 70 is used In SCPC transmitter, whole N number of sub-blocks correspond to a carrier wave.If transmitter 70 is used in multicarrier and sends out Sending in device, each in the most N number of sub-block can correspond to a carrier wave.Alternatively, though transmitter 70 Being used in multicarrier transmitter, the multiple sub-blocks in N number of sub-block may correspond to a carrier wave.Meanwhile, at figure In the transmitter 70 of 10, generate time-domain signal by an IFFT unit 73.Therefore, in order to make Figure 10's Transmitter 70 is used in multicarrier transmitter, it is necessary to the son between adjacent carrier wave in aligned abutment carrier wave distribution condition Intercarrier every.

Figure 11 shows another example of the transmitter of the DFT-s OFDM delivery plan utilizing sub-clustering.With reference to Figure 11, Transmitter 80 includes: DFT unit 81, subcarrier mapper 82, multiple IFFT unit 83-1,83-2 ..., 83-N(N is natural number) and CP insertion unit 84.Transmitter 80 can also include: scrambling unit (does not shows Go out), modulation mapper (not shown), layer mapper (not shown) and layer exchanger (not shown), they can To be placed on before DFT unit 71.

IFFT is individually performed for each in N number of sub-block.N-th IFFT unit 38-n is by sub-block #n Perform IFFT export the n-th baseband signal (n=1,2 ..., N).N-th baseband signal is multiplied by the n-th carrier wave letter Number, to generate the n-th radio signal.After with the addition of the N number of radio signal generated by N number of sub-block, Insert unit 314 by CP and insert CP.The transmitter 80 of Figure 11 can be by the load distributing to transmitter wherein The most not adjacent not the adjoining in carrier wave distribution condition of ripple.

Figure 12 is another example of the transmitter of the DFT-s OFDM delivery plan utilizing sub-clustering.Figure 12 Shi Yi district The block specific DFT-s ofdm system of DFT precoding is performed based on block.This can be referred to as Nx SC-FDMA.With reference to Figure 12, transmitter 90 includes: code block division unit 91, block division unit 92, multiple Channel encoding unit 93-1 ..., 93-N, multiple manipulator 94-1 ..., 94-N, multiple DFT unit 95-1 ..., 95-N, multiple subcarrier mapper 96-1 ..., 96-N, multiple IFFT unit 97-1 ..., 97-N and CP Insert unit 98.Here, N can be the quantity of the multicarrier that multicarrier transmitter uses.Channel encoding unit Each in 93-1 ..., 93-N can include scrambling unit (not shown).Manipulator 94-1 ..., 94-N It is also referred to as modulation mapper.Transmitter 90 can also include being placed on DFT unit 95-1 ..., 95-N Before layer mapper (not shown) and layer exchanger (not shown).

Transmission block is divided into multiple code block by code block division unit 91.These code blocks are divided into by block division unit 92 Multiple blocks.Here, code block can be the data that multicarrier transmitter sends, and block can be by multicarrier One data slot sent.Transmitter 90 performs DFT based on block.Transmitter 90 can be used in the most adjacent Carry in ripple distribution condition or adjacent carrier wave distribution condition.

Below, UL reference signal is described.

In general, reference signal is sent by the form of sequence.Particular sequence can be used as reference signal sequence, Without limiting especially.Computer formation sequence based on phase-shift keying (PSK) (PSK) is used as reference signal sequence Row.The example of PSK includes binary phase shift keying (BPSK) and QPSK (QPSK).Alternatively, Permanent envelope zero relevant (CAZAC) sequence automatically can be used as reference signal sequence.The example bag of CAZAC sequence Include: based on Zadoff-Chu(ZC) sequence, there is the ZC sequence of cyclic extensions and there is the ZC sequence blocked Row.Alternatively, pseudorandom (PN) sequence can be used as reference signal sequence.The example of PN sequence includes: M-sequence, computer formation sequence, gold sequence and Kasami sequence.Cyclically shifted sequences can be used as ginseng Examine signal sequence.

UL reference signal can be divided into demodulated reference signal (DMRS) and detection reference signal (SRS).DMRS It is for demodulating during the channel of received signal is estimated the reference signal used.DMRS can with PUSCH or The transmission of PUCCH is associated.SRS is the reference signal for UL scheduling sent to BS from UE.BS leads to Cross received SRS and estimate UL channel, and use estimated UL channel in UL dispatches.SRS not with The transmission of PUSCH or PUCCH is associated.Same basic sequence can be used for DMRS and SRS.Meanwhile, In UL multiple antennas sends, the precoding of application to DMRS can be identical to the precoding of PUSCH with application. It is the major programme for multiplexing DMRS that cyclic shift separates.In lte-a system, SRS can not be prelisted Code, and can be antenna specific reference signals.

Can be according to equation 2 based on basic sequence b_u,vN () and cyclic shift α define reference signal sequence r_u,v ^(α)(n)。

[equation 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 equation 2, M_sc ^RS(1≤m≤N_RB ^max,UL) it is the length of reference signal sequence, and M_sc ^RS=m*N_sc ^RB。 N_sc ^RBIt it is the size of Resource Block indicated by the quantity by frequency domain sub-carriers.N_RB ^max, UL indicates by N_sc ^RBMultiple The maximum of the UL bandwidth of instruction.Can be by differently applying cyclic shift value α to determine according to a basic sequence The multiple reference signal sequences of justice.

Basic sequence b_u,vN () is divided into multiple groups.Here, u ∈ 0,1 ..., 29} indicates group index, and v instruction group Interior basic sequence index.Basic sequence depends on length M of basic sequence_sc ^RS.For m(1≤m≤5), each Individual group all includes having M_sc ^RSThe basic sequence (v=0) of length, for m(6≤m≤n_RB ^max,UL), each Individual group all includes having M_sc ^RS(2 basic sequences (v=0,1) of length.Sequence set index u in group is with basic Sequence index v can change according to the time as in group frequency hopping or sequence hopping.

And, if a length of 3N of reference signal sequence_sc ^RBOr bigger, then can be defined substantially by equation 3 Sequence.

[equation 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 equation 3, q indicate Zadoff-Chu(ZC) sequence root index.N_ZC ^RSIt is the length of ZC sequence, And can be to compare M_sc ^RSLittle largest prime number.The ZC sequence with root index q can be defined by equation 4.

[equation 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 be given by equation 5.

[equation 5]

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

If a length of 3N of reference signal sequence_sc ^RBOr less, then can define basic sequence by equation 6.

[equation 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 applied as follows.

Can be according to equation 7 based on group frequency-hopping mode f_gh(n_s) and sequential shift pattern f_ssDefine and there is time slot index n_sSequence set index u.

[equation 7]

U=(f_gh(n_s)+f_ss)mod 30

17 different group frequency-hopping modes and 30 different sequential shift patterns can be there are.Can be indicated by higher Whether set of applications frequency hopping.

PUCCH and PUSCH can have identical group frequency-hopping mode.Group frequency hopping can be defined by equation 8 Pattern f_gh(n_s).

[equation 8]

In equation 8, c (i) is the pseudo-random sequence as PN sequence, and can be by the Gold of a length of 31 Sequence defines.Equation 9 shows the example of gold sequence c (n).

[equation 9]

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)+x₁(n+1)+x₁(n))mod 2

Here, Nc=1600, x₁I () is the first m-sequence, and x₂I () is the second m-sequence.Such as, a m sequence Row or the second m-sequence can be according to for the cell identifier (ID) of each OFDM symbol, radio The type of the number of timeslots in frame, the OFDM symbol in time slot index and CP initializes.In each nothing In in line electricity frame first, pseudo-random sequence generator can be initialized as

PUCCH and PUSCH can have identical sequential shift pattern.The sequential shift pattern of PUCCH is permissible For f_ss ^PUCCH=N_ID ^cellmod 30.The sequential shift pattern of PUSCH can be f_ss ^PUSCH=(f_ss ^PUCCH+Δ_ss)mod 30, and Δ_ss∈ 0,1 ..., 29} can be configured by higher.

Sequence hopping can be applied only to have and compare 6N_sc ^RBThe reference signal sequence of longer length.Here it is possible to it is logical Cross equation 10 define have time slot index n_sBasic sequence group in basic sequence index v.

[equation 10]

C (i) can be represented by the example of equation 9.Whether application sequence frequency hopping can be indicated by higher.Often In in one radio frame first, pseudo-random sequence generator can be initialized as

DMRS sequence for PUSCH can be defined by equation 11.

[equation 11]

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

In equation 11, m=0,1 ... and n=0 ..., M_sc ^RS-1。M_sc ^RS=M_sc ^PUSCH。

α=2πn_cs/ 12, i.e. in time slot, provide cyclic shift value, and n_csCan be defined by equation 12.

[equation 12]

$n_{\mathrm{cs}}=(n_{\mathrm{DMRS}}^{\left(1\right)}+n_{\mathrm{DMRS}}^{\left(2\right)}+n_{\mathrm{PRS}}\left(n_s\right))\mathrm{mod}12$

In equation 12, the parameter sent by higher indicates n_DMRS ⁽¹⁾, and table 3 show this parameter with n_DMRS ⁽¹⁾Between the example of corresponding relation.

[table 3]

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

Return equation 12, can be by sending in the corresponding DCI format 0 sending block for PUSCH Cyclic shift field defines n_DMRS ⁽²⁾.This DCI format sends in PDCCH.Cyclic shift field can have There is 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 DCI format 0	nDMRS (2)
		000	0
001	6
		010	3
011	4
		100	2
101	8
		110	10
111	9

If not sending the PDCCH including DCI format 0 in same transmission block, if in same transmission block partly (semi-persistently) dispatches a PUSCH statically, if or utilizing in same transmission block and connect at random Enter to respond allowance and dispatch a PUSCH, then n_DMRS ⁽²⁾Can be 0.

n_PRS(n_s) can be defined by equation 13.

[equation 13]

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

C (i) can be represented by the example of equation 9, and can be by community ad hoc fashion application c (i) of c (i).? In in each radio frame first, pseudo-random sequence generator can be initialized as

DMRS sequence r^PUSCHIt is multiplied by amplitude scaling factor β_PUSCH, and the r initiateed from sequence^PUSCH(0) map to The physics used in relevant PUSCH sends sends block.In the case of normal CP, DMRS sequence is mapped The 4th OFDM symbol (OFDM symbol index 3) to a time slot, and in the case of extension CP, DMRS The 3rd OFDM symbol (OFDM symbol index 2) that sequence is mapped in a time slot.

Definition SRS sequence r_SRS(n)=r_u,v ^(α)(n).U instruction PUCH sequence set index, and v indicates basic sequence rope Draw.Cyclic shift value α is defined by equation 14.

[equation 14]

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

n_SRS ^csIt is the value relevant with each UE configured by higher, and can be from the integer of 0 to 7 Any one.

Meanwhile, orthogonal code covers (OCC) and can be applied to reference signal sequence.OCC means just have difference Hand over property and the code to sequence can be applied.In general, for multiple channel that is distinguished from each other, it is possible to use different Sequence, but OCC can be utilized to be distinguished from each other the plurality of channel.

OCC can be used for following purpose.

1) OCC can be applied, in order to increase the amount of the radio resource distributing to uplink reference signals.

For example, it is assumed that the cyclic shift value of the reference signal sent in the first time slot and the second time slot is assigned to a, Symbol (-) then can be distributed to the reference signal sent in the second time slot.That is, first user can be second Time slot sends have cyclic shift value a and symbol (+) reference signal, and the second user can be at the second time slot Middle transmission has cyclic shift value a and the reference signal of symbol (-).BS can be by sending in the second time slot Reference signal and the reference signal phase Calais that sends in the first slot estimate the channel of first user.And, BS Can estimate by deducting the reference signal sent in the second time slot from the reference signal sent in the first slot The channel of the second user.If that is, application OCC, then BS can distinguish the reference signal that sent by first user and The reference signal sent by the second user.Therefore, the amount of radio resource can because of at least two user utilize identical Different OCC is used to double while reference signal sequence.

2) OCC can be applied, in order to increase and distribute to multiple antennas of unique user or the cyclic shift value of multiple layers Between interval.Below, the cyclic shift value distributing to multiple layers is described but it also may application is distributed to many The cyclic shift value of individual antenna.

Uplink reference signals is distinguished from each other channel based on cyclic shift value.In order to be distinguished from each other in multi-antenna systems Different cyclic shift value can be distributed to the reference signal for each layer by multiple layers.Cyclic shift value to be distributed Quantity must increase according to the increase of the number of plies, thus reduce the interval between cyclic shift value.Therefore, channel Estimate that performance reduces because being difficult to be distinguished from each other multiple channel.In order to solve this problem, can be to each layer of application OCC.For example, it is assumed that cyclic shift deviation 0,6,3,9 to be distributed to the corresponding reference signal of four layers.Accordingly Layer reference signal cyclic shift value between be spaced apart 3.Here it is possible to by being the OCC of (-) by symbol Application makes the interval between the cyclic shift value of the reference signal of the layer of antenna increase to 6 to third layer and the 4th layer. It is thus possible to increase the performance that channel is estimated.

3) OCC can be applied, in order to increase the interval between the cyclic shift value distributing to unique user.

Including having in the MU-MIMO system of multiple users of multiple antenna, can be by OCC application to circulation Shift value.Such as, from perform MIMO send unique user angle from the point of view of, in order to be distinguished from each other multiple antenna or Multiple layers, can apply the cyclic shift value between antenna or layer with distance interval.But, from multiple users' From the point of view of angle, the cyclic shift interval between user may constriction.In order to solve this problem, it is possible to use OCC. When applying OCC, same cyclic shift value can be applied between a plurality of users according to the type of OCC.

Figure 13 shows the example of OCC application to reference signal.

By the reference signal sequence being used for layer 0 in a subframe be used for the reference signal sequence of layer 1 and map to 4th SC-FDMA symbol of the first time slot and the 4th SC-FDMA symbol of the second time slot.By same sequence mapping Two SC-FDMA symbols to each layer.Here, the reference signal sequence for layer 0 is multiplied by orthogonal sequence [+1+1], then maps to SC-FDMA symbol.Reference signal sequence for layer 1 is multiplied by orthogonal sequence [+1-1], Then SC-FDMA symbol is mapped to.That is, when the reference signal sequence being used for layer 1 is mapped in a subframe During the second time slot, reference signal sequence is multiplied by-1 and then maps.

Apply OCC if as discussed above, then the BS receiving reference signal can be by sending in the first slot Reference signal sequence and the reference signal sequence phase Calais sent in the second time slot estimate the channel of layer 0.And, BS can be by deducting, from the reference signal sequence sent in the first slot, the reference signal sent the second time slot Sequence estimates the channel of layer 1.That is, the ginseng that BS can send by applying OCC be distinguished from each other in equivalent layer Examine signal.Therefore, it can utilize same asset to send multiple reference signal.The number of cyclic shift value if possible Amount is 6, then the layer of OCC multiplexing or the quantity of user can be utilized can to increase to 12.

In this illustration, it is assumed that binary format [+1+1] or [+1-1] are used as OCC, but are not limited to this, and It is various orthogonal sequences can be used as OCC.For example, it is possible to by such as Walsh code, DFT coefficient and CAZAC The orthogonal sequence of sequence is applied to OCC.Furthermore, it is possible to by application OCC and have different bandwidth user it Between more easily multiplexing reference signal.

Below, the method that proposition generates reference signal sequence is described.

As set forth above, it is possible to whether indicated in LTE version 8 to ginseng by the signal sent by community ad hoc fashion Examine signal sequence and perform sequence set frequency hopping (SGH).Indicate whether that the community that reference signal sequence performs SGH is specific Signal is hereinafter referred to as community specific GH parameter.Although LTE version 8UE and LTE-AUE is total in a community Deposit, but it is identical in LTE version 8 with LTE-AUE whether reference signal sequence performs SGH.Can be for Each time slot performs SGH or the sequence hopping (SH) currently defined.Community specific GH parameter can be by The group frequency hopping that higher provides enables parameter.It is true time when group frequency hopping enables the value of parameter, performs for reference signal sequence The SGH of row, but do not perform SH.It is fictitious time when group frequency hopping enables the value of parameter, does not perform for reference signal sequence SGH, and according to provided by higher indicate whether perform SH community specific SH parameter determine whether Perform SH.This community specific SH parameter can be that the sequence hopping provided by higher enables parameter.

Meanwhile, in LTE-A, LTE version 8UE and LTE-AUE can perform MU-MIMO and send, or Person LTE-A UE can perform MU-MIMO and send.Here, in order to support to have the UE's of different bandwidth MU-MIMO sends, and can apply OCC.When applying OCC, execution MU-MIMO can be improved and send UE between orthogonality and also handling capacity can be improved.But, if UE has different bandwidth, and root Determine whether to perform for reference signal sequence according in specific GH or the SH parameter of the community defined in LTE version 8 SGH or SH, then can not ensure the orthogonality between the reference signal that each UE sends fully.

Figure 14 is that multiple UE utilizes different bandwidth to perform the example that MU-MIMO sends.In Figure 14 (a), Oneth UE UE1 and the 2nd UE UE2 performs same band.In such a case, it is possible to according at LTE version 8 Defined in community specific GH or SH parameter determine whether for reference signal basic sequence perform SGH or SH.In Figure 14 (b), a width of 2nd UE UE2 of band and the 3rd UE UE3 that a UE UE1 uses use The sum of bandwidth.That is, the oneth UE, the 2nd UE and the 3rd UE use different bandwidth.In this case, The basic sequence of the reference signal needing to utilize new method to determine whether for each UE to send perform SGH or SH。

Therefore, in addition to existing community specific GH parameter and existing community specific SH parameter, it is also possible to new Definition UE specific SGH parameter.UE specific SGH parameter is the information for particular UE, and can only send out Deliver to this particular UE.This UE specific SGH parameter can be applied to utilizing the PUSCH money distributing to particular UE The DMRS that source sends.That is, this UE specific SGH parameter may indicate whether for utilizing PUSCH resource to send out The basic sequence of the DMRS sent performs SGH/SH.For ease of description below, only join by the specific SGH of UE Number determines whether that the example performing SGH and SH for the basic sequence of reference signal is described, but is not limited to this. Can by the UE specific SH parameter that SGH parameter specific from UE is different determine whether for reference signal basic Sequence application SH.And, describe the basic of the DMRS that the present invention is applied to utilize PUSCH resource to send The example of sequence, but it is not limited to this.The present invention is also applicable to variously utilize PUCCH resource to send DMRS, SRS etc..Further it is assumed that plurality of UE has a MU-MIMO environment of different bandwidth, but this Invention can be applied to plurality of UE has MU-MIMO or the SU-MIMO environment of same band.

When the value of community specific GH parameter or community specific SH parameter is the most thus to hold the basic sequence of reference signal During row SGH or SH, for utilize PUSCH resource DMRS and utilize PUCCH resource DMRS and STS performs timeslot-level SGH or SH jointly.That is, sequence set index (or number) of the basic sequence of reference signal Change for each time slot, or basic sequence index (or number) change in sequence set.Here it is possible to again Indicate whether that the DMRS for utilizing PUSCH resource performs SGH or SH by UE specific SGH parameter. In other words, UE specific SGH parameter has precedence over community specific GH parameter or community specific SGH parameter.UE Specific SGH parameter can be disabling sequence set frequency parameter.That is, if the value of UE specific SGH parameter is true, Then can not perform SGH and SH, and GH parameter specific with community or community specific SH parameter are unrelated.More specifically Ground is said, when the value of UE specific SGH parameter is true time, although community specific GH parameter or community specific SH parameter Indicate the basic sequence for reference signal to perform SGH or SH, but the basic sequence for reference signal can not be performed SGH and SH of row.If not performing SGH, then the sequence set index of the basic sequence of reference signal can not pin Each time slot is changed.And, as in the case of by community specific GH parameter execution SGH, because of For not performing SH, so the basic sequence index of the basic sequence of reference signal is not for each time slot and changes.This In, two time slots in subframe send the base of the reference signal with basic sequence index (such as identical sequence group index) This sequence, because only not performing SGH and SH in a subframe, but can apply SGH or SH across the sub-frames. Alternatively, because not applying SGH and SH in all subframes, all time slots can send has identical sequence The basic sequence of row group index and the reference signal of identical basic sequence index.Meanwhile, when UE specific SGH parameter Value be fictitious time, can perform for reference signal according to community specific GH parameter or community specific SH parameter SGH or SH of basic sequence.

Figure 15 is the example not performing SGH and SH according to the UE proposed specific SGH parameter.With reference to Figure 15, When performing SGH and SH in LET version 8 or 9, in each time slot, the reference signal of transmission is basic The sequence set index of sequence or basic sequence index difference.Method 1 be wherein according to UE specific SGH parameter one The situation of SGH and SH is not performed in subframe.Two time slots in each subframe generate has identical sequence group rope Draw the basic sequence of reference signal with identical basic sequence index, and sequence set index or basic sequence index at son Change between frame.Method 2 is wherein not perform SGH and SH in all subframes according to UE specific SGH parameter Situation.Therefore, all subframes generate and have the identical sequence group index reference signal with identical basic sequence index Basic sequence.

Figure 16 is the embodiment of the method generating reference signal sequence proposed.

In step S100, UE receives UE specific SGH parameter.UE specific SGH parameter can be given by higher Go out.In step S110, UE generates reference signal sequence for each time slot based on basic sequence.Basic sequence Can be according to by indicating whether that the UE specific SGH parameter performing SGH and SH determines for each time slot Sequence group number and basic sequence number are classified.

Can utilize whether following various method performs SGH and SH according to UE specific SGH parameter to UE notice.

1) the frequency hopping mark being included in the DCI format that up-link sends can play UE specific SGH ginseng The effect of number.Such as, if enabling frequency hopping by frequency hopping mark, then can perform timeslot-level SGH or SH. And, if disabling frequency hopping by frequency hopping mark, then can not perform for the DMRS utilizing PUSCH resource SGH and SH of basic sequence.Alternatively, SGH or SH can be performed for each subframe.

2) instruction can being included in the bit of the UE ID in the DCI format that up-link sends with instruction Whether the basic sequence for reference signal perform the masking information of SGH and SH indicate whether to perform SGH and SH。

3) when specifying the particular index of the cyclic shift designator being included in the DCI format that UL sends, May indicate whether to perform SGH and SH for the basic sequence of reference signal.

4) can include indicating whether to hold for the basic sequence of reference signal in the DCI format sent for UL The UE specific SGH parameter of row SGH and SH.

5) by the higher signaling for particular UE, specific for UE SGH parameter can be sent to particular UE.

6) if using the DFT-s OFDM delivery plan of sub-clustering, then can not perform for reference signal is basic SGH and SH of sequence.

Meanwhile, as SGH and SH not performing the basic sequence for reference signal according to UE specific SGH parameter Time, OCC can be applied to associated reference signal.If perform for reference signal basic sequence SGH or SH, then can not apply OCC.

Multiple method can be used to indicate whether to apply OCC.First, when indicating cyclic shift by DCI format Index, and when sending, by higher, the OCC index indicating whether to apply OCC, if do not performed for reference Whether SGH and SH of the basic sequence of signal, then can use steadily according to OCC indexes applications OCC. Such as, if OCC index be 0, then can not apply OCC, and if OCC index be 1, then can apply OCC.Alternatively, if OCC index be 1, then can not apply OCC, and if OCC index be 0, Then can apply OCC.And, if performing SGH or SH of the basic sequence for reference signal, the most permissible Determine whether to apply OCC by the mode contrary with OCC index.Such as, if OCC index is 0, then may be used To apply OCC, and if OCC index be 1, then can not apply OCC.Alternatively, if OCC rope Be cited as 1, then can apply OCC, and if OCC index be 0, then can not apply OCC.

Alternatively, the OCC index indicating whether to apply OCC can not be defined individually, and can be by In DCI format, cyclic shift index and the OCC index of combination 3 bits indicate specific OCC, thus by specific OCC application indexes to particular cyclic shift.Here, if performing the SGH of the basic sequence for reference signal, Then can again be inverted by the OCC index of associated cyclic displacement index instruction, thus not apply OCC.And, as Fruit does not perform SGH and SH of the basic sequence for reference signal according to UE specific SGH parameter, then can nothing The OCC index by associated cyclic displacement index instruction is alternatively utilized to apply OCC.Therefore, it can reduce distribution To the interference between the reference signal of each layer.

In superincumbent description, to wherein by UE specific SGH parameter determination whether for the base of reference signal This sequence performs the example of SGH and SH and is described.But, in MU-MIMO environment, in order to enter one Step ensures the orthogonality between the reference signal of UE, can define the new parameter indicating whether to perform SH further. Indicate whether that the new parameter performing SH can be UE specific SH parameter.This UE specific SH parameter can utilize and The method that UE specific SGH parameter is identical is applied.That is, UE specific SH parameter can have precedence over the specific SH in community Parameter.Above-mentioned UE specific SGH parameter can only determine whether to perform SGH.That is, when UE specific SGH parameter Value be true time, do not perform the SGH of the basic sequence for reference signal.And, UE specific SH parameter come Determine whether to perform SH for the basic sequence of reference signal.When the value of UE specific SH parameter is true time, do not hold The hand-manipulating of needle SH to the basic sequence of reference signal.When the value of UE specific SH parameter is fictitious time, can be special by community Determine SH parameter to determine whether to perform SH for the basic sequence of reference signal.Letter can be utilized by PDCCH Order impliedly or the most dynamically signals UE specific SH parameter, or can be by higher (such as RRC Signaling) impliedly or clearly provide UE specific SH parameter.

Meanwhile, in superincumbent description, it has been described that UE specific SGH parameter, UE specific GH parameter or UE specific SH parameter has precedence over community specific GH parameter or community specific SH parameter and unrelated with UL sending mode, But can change according to sending mode.In LTE version 8/9, substantially support individual antenna sending mode.But, In LTE-A, the efficiency sent for UL, multiple antennas sending mode can be defined, for discontinuous distribution Sending mode etc..Here it is possible to determine whether that execution UE specific SGH parameter, UE are specific according to sending mode GH parameter or UE specific SH parameter.Such as, in individual antenna sending mode, although UE is specific SGH Parameter has precedence over community specific GH parameter or community specific SH parameter, but can be by community specific GH parameter or little District's specific SH parameter determines whether to perform SGH or SH for the basic sequence of reference signal.

Figure 17 is the block diagram illustrating BS and UE realizing embodiments of the present invention.

BS 800 includes: processor 810, memorizer 820 and radio frequency (RF) unit 830.Processor 810 is real Existing function, process and/or the method proposed.Multiple layers of Radio interface protocols can be realized by processor 810. Memorizer 820 coupled to processor 810, and its storage is for driving the various information of processor 810.RF is mono- Unit 830 coupled to processor 810, and it sends UE specific SGH parameter to UE.

UE 900 includes: processor 910, memorizer 920 and RF unit 930.RF unit 930 coupled to place Reason device 910, and its reception UE specific SGH parameter.Processor 910 realize proposed function, process and/ Or method.Multiple layers of Radio interface protocols can be realized by processor 910.Processor 910 be configured to for Each time slot generates reference signal sequence based on basic sequence.Basic sequence is according to by indicating whether execution SGH's Sequence group number and basic sequence number that UE specific SGH parameter determines for each time slot are classified.Memorizer 920 coupled to processor 910, and its storage is for driving the various information of processor 910.

Processor 810,910 can include special IC (ASIC), other chipset, logic circuit and/ Or data processing equipment.Memorizer 820,920 may include that read only memory (ROM), random access memory Device (RAM), flash memory, storage card, storage medium and/or other storage device.RF unit 830,930 is permissible Including the baseband circuit for processing radiofrequency signal.When realizing embodiment with software, it is possible to use perform to retouch at this The module (such as, process, function etc.) of the function stated realizes technology described here.These modules can store In memorizer 820,920, and performed by processor 810,910.Memorizer 820,920 can be Realizing in processor 810,910, or it is outside to be in processor 810,910, in this case, memorizer is permissible It is communicatively coupled to processor 810,910 via various modes known in the art.

About example system described here, with reference to several flow charts to realizing according to disclosed theme Method be described.Although for purposes of clarity, method is illustrated and is described as series of steps or frame, But will be apparent to and it is clear that theme required for protection is not limited by the order of these steps or frame, such as some steps Can occur in different order or occur with other step described at this and describe simultaneously.And, art technology Personnel it should be understood that the step illustrated in flow chart is not exclusive, but is not affecting the scope of the present disclosure and spirit In the case of, other step can be included, or one or more step in example flow diagram can be deleted.

The example including various aspects described above.Certainly, it is impossible to describe for the purpose describing various aspects Each of multiple assemblies or method is it is contemplated that combine, but it will be appreciated by the appropriately skilled person that many groups further Close and displacement is all possible.Therefore, this specification is intended to fall within the spirit and scope of the appended claims All these change examples, modification and modified example.

Claims (12)

1. the method being generated reference signal sequence by subscriber equipment (UE) in a wireless communication system, described side Method includes:

From specific group of reception community, base station frequency hopping (GH) parameter, specific GH parameter instruction in described community is to reference to letter Number sequence performs sequence set frequency hopping；

The UE specific SGH parameter specified for described subscriber equipment, the specific SGH of described UE is received from described base station Parameter instruction does not perform sequence set frequency hopping to described reference signal sequence, wherein, described community specific GH parameter refers to Show that described sequence set frequency hopping will be performed；And

Generate reference signal sequence for each time slot based on basic sequence, the sequence group number of described basic sequence by Described UE specific SGH parameter determines.

Method the most according to claim 1, wherein, described UE specific SGH parameter is sent by higher.

Method the most according to claim 1, wherein, described community specific GH parameter is sent by higher.

Method the most according to claim 1, wherein, the sequence group number of the time slot in a subframe is mutually the same.

Method the most according to claim 1, wherein, the sequence group number of all time slots in a frame is mutually the same.

Method the most according to claim 1, wherein, the sequence group number in each time slot is come by equation below Determine:

U=(f_gh(n_s)+f_ss) mod30,

Wherein, n_sRepresent time slot index, f_ssExpression sequential shift pattern, and f_gh(n_s) represent determined by equation below Group frequency-hopping mode:

7. the subscriber equipment (UE) generating reference signal sequence in a wireless communication system, this subscriber equipment (UE) Including:

Radio frequency (RF) unit, this radio frequency (RF) unit is used for sending or receiving radio signal；With

Processor, this processor is operably coupled to described RF unit, and is configured to:

From specific group of reception community, base station frequency hopping (GH) parameter, specific GH parameter instruction in described community is to reference to letter Number sequence performs sequence set frequency hopping；

The UE specific SGH parameter specified for described subscriber equipment, the specific SGH of described UE is received from described base station Parameter instruction does not perform sequence set frequency hopping to described reference signal sequence, wherein, described community specific GH parameter refers to Show that described sequence set frequency hopping will be performed；And

Generate reference signal sequence for each time slot based on basic sequence, the sequence group number of described basic sequence by Described UE specific SGH parameter determines.

Subscriber equipment the most according to claim 7, wherein, described UE specific SGH parameter passes through higher Send.

Subscriber equipment the most according to claim 7, wherein, described community specific GH parameter passes through higher Send.

Subscriber equipment the most according to claim 7, wherein, the sequence group number in time slot in a subframe that This is identical.

11. subscriber equipmenies according to claim 7, wherein, the sequence group number in all time slots in a frame that This is identical.

12. subscriber equipmenies according to claim 7, wherein, the sequence group number in each time slot is by following etc. Formula determines:

U=(f_gh(n_s)+f_ss) mod30,

Wherein, n_sRepresent time slot index, f_ssExpression sequential shift pattern, and f_gh(n_s) represent determined by equation below Group frequency-hopping mode: