CN103813468A - Downlink data transmission method and equipment - Google Patents

Abstract

The invention discloses a PDSCH transmission method. The method comprises the following steps: control signaling of PDSCH transmission dispatched by a base station is received by UE; and PDSCH dispatched by the base station is received by the UE, and on a PRB pair including REs for P-BCH, DMRS demodulation PDSCH information of the P-BCH is multiplexed. By adopting the method and equipment of the invention, a method for transmitting PDSCH on residual REs of the PRB pair including the REs for the P-BCH is provided, and the interference on the P-BCH transmission can be avoided.

Description

A kind of method and apparatus of transmitting downlink data

Technical field

The present invention relates to wireless communication system, relate in particular in the time that Physical Resource Block (PRB) is used for sending the broadcast message of main broadcast channel (P-BCH) to a part of running time-frequency resource of (PRB Pair), on remaining running time-frequency resource, send the method for other downlink informations.

Background technology

In 3GPP LTE/LTE-Advanced system, the length of each radio frames is 10ms, is divided into 10 subframes.A downlink transfer time interval (TTI) is exactly to be defined in a subframe.Be the frame structure of FDD system as shown in Figure 1, each descending sub frame comprises two time slots, and to general Cyclic Prefix (CP) length, each time slot comprises 7 OFDM symbols; To expansion CP length, each time slot comprises 6 OFDM symbols.Be the frame structure of TDD system as shown in Figure 2, each radio frames is divided into the field that two length are 5ms; Subframe 1 and subframe 6 comprise respectively 3 special domain, i.e. descending pilot frequency time slot (DwPTS), protection interval (GP) and uplink pilot time slot (UpPTS), the length of these 3 special domain be 1ms.

The descending sub frame structure in LTE system as shown in Figure 3.Wherein, front n OFDM symbol (n equals 1,2 or 3) is down control channel region, for transmission user Downlink Control Information, comprise Physical Control Format Indicator Channel (PCFICH), Physical HARQ Indicator Channel (PHICH) and Physical Downlink Control Channel (PDCCH); Remaining OFDM symbol is used for transmission user downlink data, for example, and Physical Downlink Shared Channel (PDSCH).Down physical channel is the set of a series of Resource Units (RE).RE is the least unit of running time-frequency resource, in frequency, is a subcarrier, is an OFDM symbol on the time.The granularity of physical source distributing is Physical Resource Block PRB, and a PRB comprises 12 continuous subcarriers in frequency, in time a corresponding time slot.Two PRB in two time slots in a subframe in same sub-carrier are called a PRB to (PRB pair).RE can be for different functions, and the not corresponding physical channel above-mentioned of some RE is the transmission for downlink physical signal, comprising downlink reference signal and synchronizing signal.According to different functions, LTE downlink reference signal comprises cell specific reference signal (CRS), the specific demodulated reference signal of user (DMRS) and channel quality indication reference signal (CSI-RS).Wherein, being divided into two code division multiplexings (CDM) collection for the RE of DMRS, is frequency division and time division multiplexing between two CDM collection; In each CDM collection, be further multiplexing two the DMRS ports of mode with CDM.

In LTE system, the transmission cycle of main broadcast channel (P-BCH) is 40ms, is divided into 4 P-BCH bursts in one-period, and is mapped to respectively the time slot 1 of 4 radio frames in one-period.A P-BCH burst is front 4 the OFDM symbols that are mapped to time slot 1 in time, is all 72 of the centres subcarrier of occupied bandwidth on frequency domain.In LTE system, to having adopted the transmission mode of UE specific reference signals, comprise for the PRB of the RE of synchronizing channel and P-BCH to, UE does not receive PDSCH transmission.

In LTE system, downlink data transmission can be based on CRS or DMRS.A benefit of the PDSCH transmission based on DMRS is the interference coordination facilitating between multiple communities, and this is because reference signal DMRS just sends in to resource at the PRB distributing.

In the further evolution system of LTE system, reduce the expense of follow-up compatible control signal and CRS, reduce the interference because of follow-up compatible control signal and CRS introducing simultaneously, be conducive to improve the availability of frequency spectrum of UE.Because reduced CRS expense, be also an improvement for system power saving performance.The ePDCCH of such system and PDSCH transmit generally based on DMRS demodulation, are generally called at present new carrier type (NCT).

To the NCT system of can work alone (Standalone), the channel in all LTE all needs to define accordingly the substitute technology in NCT, and especially, synchronizing channel and P-BCH need transmission.Like this, in the NCT system working alone, also can there are some PRB couple, its a part of RE resource is taken by synchronizing channel and P-BCH, and other remaining RE can transmit for PDSCH, so sending PDSCH on other RE beyond the RE how to take at synchronizing channel and the P-BCH of NCT is the problem that needs solve.

Summary of the invention

The invention provides when the right a part of running time-frequency resource of PRB is when sending P-BCH, on remaining running time-frequency resource, send the method for other downlink informations.

A method of transmitting PDSCH, comprising:

UE receives the control signal of base station scheduling PDSCH transmission;

UE receives the PDSCH of base station scheduling, wherein, is comprising for the PRB of the RE of P-BCH, the DMRS demodulation PDSCH information of multiplexing P-BCH.

Preferably, the division methods that PRB is right in the frequency resource for P-BCH is: fixing according to system bandwidth be even number PRB to time PRB division methods is divided.

Preferably, the DMRS sequence of described P-BCH determines that mode is: produce the long scrambler sequence of regular length, and corresponding PRB index range in described long scrambler sequence

sequence fragment or the centre of described long scrambler sequence individual PRB is the DMRS transmission for P-BCH to upper sequence fragment; Wherein,

that the PRB that takies of P-BCH is to number.

Preferably, the DMRS demodulation PDSCH information of described multiplexing P-BCH comprises:

For the broadcast message of other except P-BCH in PDSCH, other broadcast messages described in the DMRS demodulation of multiplexing described P-BCH;

For the specific PDSCH of the UE in PDSCH, utilize the specific PDSCH information of UE described in the special DMRS sequence demodulation of the specific PDSCH of UE.

Preferably, to PRB in the frequency resource for P-BCH to dividing mode with the PRB of system actual bandwidth to the consistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprising: to comprising the PRB couple for the RE of P-BCH, utilize the DMRS of described P-BCH to carry out channel estimating, and this PRB of demodulation is to upper described other broadcast messages;

The method further comprises: to do not comprise for the PRB of the RE of P-BCH to, generates DMRS sequence according to the DMRS sequence generating method of described other broadcast messages and carry out channel estimating, and this PRB of demodulation is to upper described other broadcast messages.

Preferably, to PRB in the frequency resource for P-BCH to dividing mode with the PRB of system actual bandwidth to the consistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: adopt the method identical with the DMRS sequence that generates P-BCH to generate the DMRS sequence of described other broadcast messages, comprise for the PRB of the RE of P-BCH to, utilize the DMRS modulation symbol sequence fragment of other broadcast messages identical with the DMRS modulation symbol sequence fragment of described P-BCH, carry out channel estimating, and this PRB of demodulation is to upper described other broadcast messages.

Preferably, to PRB in the frequency resource for P-BCH to dividing mode with the PRB of system actual bandwidth to the consistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: comprise for the PRB of the RE of P-BCH to, adopt other broadcast messages and the DMRS sequence identical with the DMRS sequence of P-BCH described in being exclusively used in of transmitting on other DMRS ports except the DMRS port of described P-BCH to carry out channel estimating, and this PRB is carried out to demodulation to upper described other broadcast messages.

Preferably, to PRB in the frequency resource for P-BCH to the PRB of dividing mode and system actual bandwidth to the inconsistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: on the RE overlapping at the DMRS of the DMRS of P-BCH pattern and described other broadcast messages pattern, the DMRS sequence of multiplexing P-BCH is carried out channel estimating, and carries out the demodulation of described other broadcast messages; To being only present in the RE in the DMRS pattern of P-BCH, be not used in DMRS sequence and the modulation symbol of other broadcast messages of transmission; To being only present in the RE in the DMRS pattern of other broadcast messages, utilizing the DMRS sequence that is exclusively used in other broadcast messages to carry out channel estimating, and carry out the demodulation of described other broadcast messages.

Preferably, the generation method of the DMRS sequence of described other broadcast messages, identical or different with the DMRS sequence generating method of described P-BCH.

Preferably, to PRB in the frequency resource for P-BCH to the PRB of dividing mode and system actual bandwidth to the inconsistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: adopt the method identical with the DMRS sequence that generates P-BCH to generate the DMRS sequence of described other broadcast messages, comprise for the PRB of the RE of P-BCH to, utilize the DMRS sequence of described other broadcast messages to carry out the demodulation of channel estimating and described other broadcast messages.

Preferably, the method that generates the DMRS sequence of described other broadcast messages comprises: produce the long scrambler sequence of regular length, and corresponding in the middle of described long scrambler sequence individual PRB is the DMRS transmission for described other broadcast messages to the sequence fragment of upper DMRS RE number,

that the PRB of system bandwidth is to number.

Preferably, corresponding in the middle of by described long scrambler sequence when individual PRB transmits for the DMRS of described other broadcast messages the sequence fragment of upper DMRS RE number, RE to first for the CDM collection of the DMRS of described other broadcast messages, take DC as boundary, the little DMRS RE number of sub-carrier indices is than many one of the large DMRS RE number of sub-carrier indices; To second RE for the CDM collection of the DMRS of described other broadcast messages, the little DMRS RE number of sub-carrier indices is than few one of the large DMRS RE number of sub-carrier indices.

Preferably, the method further comprises: when described UE receives the specific PDSCH of UE of base station scheduling, to the specific PDSCH of UE, comprise for the PRB of the RE of P-BCH on do not receive for transmitting the specific PDSCH of UE.

Preferably, the method further comprises: when described UE receives the specific PDSCH of UE of base station scheduling, to the specific PDSCH of UE, comprise for the PRB of the RE of P-BCH to, if the running time-frequency resource that the DMRS of the specific PDSCH of UE of base station scheduling takies conflicts with the running time-frequency resource of the DMRS of P-BCH, at this PRB to the interior specific PDSCH of UE that do not receive.

Preferably, when described UE receives the specific PDSCH of UE of base station scheduling, if the DMRS port that the specific PDSCH of UE uses is a subset for the DMRS port of P-BCH, the PRB of the RE that comprises P-BCH on receive the specific PDSCH of described UE of base station scheduling.

Preferably, for the PRB couple comprising for the RE of P-BCH, on the RE overlapping of the DMRS of the specific PDSCH of UE pattern and the DMRS pattern of P-BCH, the DMRS signal of the multiplexing P-BCH of the specific PDSCH of UE; On the RE of DMRS signal that is exclusively used in the specific PDSCH of UE, generate DMRS sequence according to the DMRS sequence generating method of the DMRS sequence generating method of the specific PDSCH of UE or P-BCH, for carrying out channel estimating and the demodulation of the specific PDSCH of corresponding described UE;

Or,

Adopt the method identical with the DMRS sequence that generates P-BCH to generate the DMRS sequence of the specific PDSCH of described UE, comprise for the PRB of the RE of P-BCH to, utilize the DMRS sequence of the specific PDSCH of described UE to carry out the demodulation of channel estimating and the specific PDSCH of described UE.

A base station equipment that sends PDSCH, comprising:

Signal generator module, for downlink data is encoded, rate-matched and modulation operations, the modulation symbol that generation will send;

Multiplexing module, multiplexing for the modulation symbol of PDSCH being carried out to running time-frequency resource; Wherein, comprised for the PRB of the RE of P-BCH to, the modulation symbol of multiplexing P-BCH and the modulation symbol of PDSCH, the DMRS of other broadcast messages in the DMRS of multiplexing P-BCH and described PDSCH except described P-BCH;

Sending module, for sending multiplexing downstream signal afterwards.

A UE equipment that receives PDSCH, comprising:

Receiver module, for receiving the downstream signal of base station;

Demultiplexing module, obtains the modulation symbol of PDSCH for demultiplexing; Wherein, comprising for the PRB of the RE of P-BCH, demultiplexing DMRS, and the modulation symbol of demultiplexing PDSCH other RE beyond the RE taking from P-BCH;

Parsing module, for carrying out demodulation, rate de-matching and decode operation to the PDSCH modulation symbol of demultiplexing output; Wherein, other broadcast messages except described P-BCH in the DMRS demodulation PDSCH of multiplexing described P-BCH.

Adopt method and apparatus of the present invention, provide on having comprised for the right residue RE of the PRB of the RE of P-BCH and transmit the method for PDSCH, and avoid the interference to P-BCH transmission.

Accompanying drawing explanation

Fig. 1 is the frame structure schematic diagram of FDD system;

Fig. 2 is the frame structure schematic diagram of TDD system;

Fig. 3 is the descending sub frame structural representation in LTE system;

Fig. 4 is the schematic diagram that transmits other PDSCH on the residue RE outside the RE taking at P-BCH in the application;

Fig. 5 is that the PRB of P-BCH and system is to dividing the DMRS pattern schematic diagram of P-BCH and other PDSCH in inconsistent situation;

Fig. 6 is the structural representation that sends the base station equipment of PDSCH in the application;

Fig. 7 is the structural representation that receives the UE equipment of PDSCH in the application.

Embodiment

In order to make the application's object, technological means and advantage clearer, below in conjunction with accompanying drawing, the application is described in further details.

To the community based on DMRS demodulation down control channel and PDSCH, in the time that it is worked as an individual cell, P-BCH also need to transmit based on DMRS.For example, P-BCH takies some running time-frequency resources on middle 72 subcarriers of system bandwidth, is also to upload defeated at middle 72 subcarriers so for the DMRS of P-BCH.The PRB of carrying P-BCH on, in fact P-BCH has only taken a part of running time-frequency resource, and other remaining RE can be for other PDSCH transmission.

The process of transmitting other PDSCH on the residue RE outside the RE taking at P-BCH in the application as shown in Figure 4:

Step 401:UE receives the control signal of base station scheduling PDSCH transmission;

Step 402:UE receives the PDSCH of base station scheduling, wherein, is comprising for the PRB of the RE of P-BCH, the DMRS demodulation PDSCH information of multiplexing P-BCH.

In step 402, receive and when demodulation PDSCH DMRS that can multiplexing P-BCH for the DMRS of demodulation PDSCH at UE.Here, the PDSCH of base station scheduling comprises other broadcasts and the specific PDSCH of UE except P-BCH.

And in the time of the DMRS of multiplexing P-BCH, under different preconditions, the DMRS pattern of P-BCH may be identical with the DMRS pattern of PDSCH, also may be different, thereby concrete processing while causing multiplexing P-BCH also there are differences.Wherein, above-mentioned precondition may comprise the division right for the PRB of the frequency resource of P-BCH, the PRB that carries out according to real system bandwidth is to dividing and definite mode of DMRS sequence.

Next, first the problem of PRB to division be once discussed.

For the PRB of real system bandwidth, to dividing, in fact, the PRB comprising according to system bandwidth is odd number or even number to number, and the division methods that this PRB is right is different.If system bandwidth comprises even number PRB couple, the PRB couple of half number has respectively been divided in the both sides of DC; If system bandwidth comprises odd number PRB couple, the PRB in the middle of system bandwidth, to being divided into two parts by DC, respectively has 6 subcarriers in the both sides of DC.In other words, under two kinds of bandwidth of odd number even number, right being divided in of PRB has been offset 6 subcarriers in frequency.

To dividing, can there be following three kinds of division methods for the PRB in the frequency resource for P-BCH:

One, UE is not know that the PRB that system bandwidth comprises is right detecting before P-BCH, if do not increase the number of times of the hypothesis testing of UE, can be to be independent of the PRB of real system bandwidth to dividing for the PRB in P-BCH frequency resource to dividing.For example: the fixing hypothesis of UE P-BCH be according to system bandwidth be even number PRB to time PRB the same method of division methods is divided to PRB couple.Then, the PRB dividing for P-BCH on, send for the DMRS of P-BCH demodulation.Like this, if system bandwidth is even number PRB couple, obviously the actual PRB of the PRB of P-BCH division and system is consistent to dividing; If system bandwidth is odd number PRB couple, the PRB that P-BCH adopts to divide and the actual PRB of system to being different, and the DMRS pattern of PDSCH transmission is to accordingly with the PRB of real system bandwidth division, this causes for the DMRS pattern of the DMRS pattern of P-BCH demodulation and other PDSCH transmission is inconsistent, is equivalent to be offset 6 subcarriers in frequency.

Two, the another kind of PRB that determines P-BCH is that the PRB being used in P-BCH frequency resource is consistent to division methods to the PRB of division methods and real system bandwidth to division methods.Like this, because when system bandwidth be respectively even number PRB to odd number PRB to time, both PRB are inconsistent to the pattern of DMRS under division methods, so can pass through twice blind Detecting, be that corresponding bandwidth is that odd number or two kinds of DMRS patterns of even number carry out respectively channel estimating and P-BCH is decoded, and then judge the parity of the PRB number that bandwidth comprises.

Three, can also pass through to increase the hypothesis testing of P-SCH/S-SCH, thereby except the mark of indicating cell, the information of the parity of the system bandwidth of indication 1 bit.The parity of system bandwidth as indicated, guarantees that the PRB of P-BCH is consistent to dividing to dividing with the PRB of system actual bandwidth.

Adopt the second and the third method, the PRB division methods of P-BCH is consistent with the PRB division methods of other PDSCH, and correspondingly, in two kinds of situations, the pattern of DMRS is also consistent, thereby has simplified system operation.Carry out PDSCH transmission actual, when DMRS that can direct multiplexing P-BCH, also correspondingly simplified processing procedure.

In step 402, be identified for after the PRB division methods of P-BCH transmission, before P-BCH is carried out to channel estimating, UE also needs to know in advance the DMRS sequence for P-BCH, the DMRS sequence that is P-BCH need to be that community is specific, and with system bandwidth in PRB number irrelevant.Can there is several different methods to determine the scrambler sequence of the DMRS of P-BCH.

First method can be to be similar to the method that produces DRS sequence in downlink transfer mode 7, and the modulation symbol number of the PRB taking according to P-BCH to upper DMRS sequence, produces isometric DMRS sequence, and is mapped to each RE of the DMRS of P-BCH.

Or, second method can be to be similar to the method that produces the modulation symbol of DMRS in downlink transfer pattern 8/9/10, first produce long modulation symbol sequence, for example, produce described long modulation symbol sequence according to 110 right demands of PRB, corresponding PRB index range

sequence fragment for the DMRS transmission of P-BCH.Take general CP as example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively, in r (m) corresponding PRB to scope

dMRS fragment for the DMRS transmission of P-BCH.At the n of P-BCH _pRBindividual PRB to the modulation symbol of upper DMRS is $a_{k,l}^{\left(p\right)}=w_p\left(l^{\′}\right)\·r(3\·l^{\′}\·N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\·n_{\mathrm{PRB}}+m^{\′}),$ Wherein,

$w_p\left(i\right)=\left\{\begin{array}{cc}{\stackrel{\&OverBar;}{w}}_p\left(i\right)& (m^{\&prime;}+n_{\mathrm{PRB}})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">mod</figure-callout>}2=0\\ {\stackrel{\&OverBar;}{w}}_p(3-i)& (m^{\&prime;}+n_{\mathrm{PRB}})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">mod</figure-callout>}2=1\end{array}\right.$

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

Or, the third method can be to be similar to the method that produces the modulation symbol of DMRS in downlink transfer pattern 8/9/10, first produce long modulation symbol sequence, for example produce the long modulation symbol sequence of DMRS according to 110 right demands of PRB, then, the right method of division PRB that P-BCH adopts, description generates the method for the DMRS sequence of P-BCH respectively.

If P-BCH be according to system bandwidth be even number PRB to time PRB the same method of division methods is divided to PRB couple, fixing the correspondence of long modulation symbol sequence centre

individual PRB is the DMRS transmission for P-BCH to upper sequence fragment.Take general CP as example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively, corresponding PRB index range

dMRS fragment for the DMRS transmission of P-BCH.The n of P-BCH _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS $a_{k,l}^{\left(p\right)}=w_p\left(l^{\&prime;}\right)\&CenterDot;r(3\&CenterDot;l^{\&prime;}\&CenterDot;N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\&CenterDot;(\frac{N_{\mathrm{RB}}^{\max ,\mathrm{DL}}}{2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="N\; RB\; PBCH"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">N</figure-callout>}}_{\mathrm{RB}\mathrm{PBCH}}^{}}{2}+n_{\mathrm{PRB}})+m^{\&prime;}),$ Wherein,

$w_p\left(i\right)=\left\{\begin{array}{cc}{\stackrel{\&OverBar;}{w}}_p\left(i\right)& (m^{\&prime;}+\frac{N_{\mathrm{RB}}^{\max ,\mathrm{DL}}}{2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="N\; RB\; PBCH"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">N</figure-callout>}}_{\mathrm{RB}\mathrm{PBCH}}^{}}{2}+n_{\mathrm{PRB}})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">mod</figure-callout>}2=0\\ {\stackrel{\&OverBar;}{w}}_p(3-i)& (m^{\&prime;}+\frac{N_{\mathrm{RB}}^{\max ,\mathrm{DL}}}{2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="N\; RB\; PBCH"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">N</figure-callout>}}_{\mathrm{RB}\mathrm{PBCH}}^{}}{2}+n_{\mathrm{PRB}})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">mod</figure-callout>}2=1\end{array}\right.$

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m′=0，1，2

the Walsh extended code that DMRS port adopts, here w, _p(l ') adopted corresponding PRB index range

value.

If P-BCH be according to system bandwidth be odd number PRB to time PRB the same method of division methods is divided to PRB couple, fixing the correspondence of long modulation symbol sequence centre

individual PRB is the DMRS transmission for P-BCH to upper sequence fragment, and for example PRB to index range can be

for example, P-BCH takies 72 subcarriers in the middle of system, but because system bandwidth comprises odd number PRB couple, these 72 subcarriers be actually 7 PRB being positioned in the middle of system bandwidth to, be base station need to 7 PRB on send for the DMRS of P-BCH, but 72 subcarriers in the middle of the actual occupied bandwidth of the data RE of P-BCH.Take general CP as example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively, corresponding PRB index range

dMRS fragment for the DMRS transmission of P-BCH.The n of P-BCH _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS

wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l'mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

expression rounds up,

represent to round downwards.Here w, _p(l ') adopted corresponding PRB index range

value.

To above-mentioned the third method, if P-BCH be according to system bandwidth be odd number PRB to time PRB the same method of division methods is divided to PRB couple, fixing the correspondence of long modulation symbol sequence centre

the sequence fragment of the DMRS RE number that individual PRB is right is for the DMRS transmission of P-BCH.Take general CP as example, take DC as boundary, the RE to first for the CDM collection of DMRS, the little DMRS RE number of sub-carrier indices is than many one of the large DMRS RE number of sub-carrier indices; To second RE for the CDM collection of DMRS, sub-carrier indices little DMRS RE number than sub-carrier indices large few one of DMRS RE number.For example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively; Then, corresponding sequential element index range

sequence fragment for P-BCH

individual PRB is to the DMRS transmission on the RE of upper first CDM collection, i.e. n _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS

wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m'＝0,1,2

the Walsh extended code that DMRS port adopts,

here w, _p(l ') adopted corresponding sequential element index range

value; Corresponding sequential element index range

sequence fragment for P-BCH

individual PRB is to the DMRS transmission on the RE of upper second CDM collection.N _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS

wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

here w, _p(l ') adopted corresponding sequential element index range value.

Or, the index c of the CDM collection of introducing DMRS, to above-mentioned first CDM collection, c equals 0; To above-mentioned second CDM collection, c equals 1.Formula can unified representation be, fixing the correspondence of the centre of long modulation symbol sequence

the DMRS sequence fragment of the DMRS RE number that individual PRB is right is for the DMRS of downlink data transmission.Take general CP as example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively, corresponding sequential element index range

dMRS sequence fragment for P-BCH individual PRB is to the DMRS transmission on the RE of upper CDM collection c.N _pRBthe modulation symbol fragment of the upper DMRS of CDM collection c that individual PRB is right can be expressed as

wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

c=0,1, here, w _p(l ') adopted corresponding sequential element index range

value.

In step 402, the PRB of transmission P-BCH on, be in fact that a part of RE is taken by synchronizing channel and P-BCH etc., and other remaining RE still can be for other PDSCH transmission.Because P-BCH comprises the most important configuration information in Shi Dui community, so above-mentioned other PDSCH transmission can not be disturbed the transmission of P-BCH.To other PDSCH transmission, on the one hand, if should be used for P-BCH at a PRB to interior a part of RE, these RE can not be used further to other PDSCH transmission so; On the other hand, if carried the DMRS for P-BCH demodulation at a PRB on to interior a part of RE, can not carry again other the DMRS for other PDSCH demodulation at these RE.

Above-mentioned other PDSCH transmission except P-BCH can be divided into two classes.The first kind is other broadcast messages except P-BCH, for example SIB, and paging information (Paging), accidental access response information (RAR) etc., similar with P-BCH, these message also will cover full community user.Equations of The Second Kind is the specific PDSCH of UE, and the specific PDSCH of UE dispatches respectively for each UE, and the pre-coding matrix of its DMRS port also arranges respectively each UE.

To other PDSCH except P-BCH, can be to adopt the generation method of the DMRS in the downlink transfer pattern 9/10 that is similar to existing system to transmit DMRS.Or, to other PDSCH except P-BCH, also can adopt the method consistent with the DMRS generation method of P-BCH to transmit DMRS, on this RE that has guaranteed at least to overlap with the DMRS pattern of other PDSCH at the DMRS of P-BCH pattern, DMRS modulation symbol sequence fragment is identical.Further, can also distinguish other broadcast messages and the specific PDSCH of UE except P-BCH, can be to other broadcast messages except P-BCH, adopt the method consistent with the DMRS generation method of P-BCH to transmit DMRS; And to the specific PDSCH of UE, can be to adopt the generation method of the DMRS in the downlink transfer pattern 9/10 that is similar to existing system to transmit DMRS.Adopt this method, the DMRS signal of the convenient multiplexing P-BCH of other broadcast messages except P-BCH, the generation method that the while can multiplexing existing DMRS is transmitted the DMRS of the specific PDSCH of UE, has reduced complexity.

For distinguishing other broadcasts beyond above-mentioned P-BCH and the method for the specific PDSCH of UE, to the system based on DMRS demodulation down control channel and data channel, correspondingly can define two kinds of downlink transfer patterns.Transmission mode, for the treatment of other broadcast messages beyond P-BCH, is generally to adopt the technology of the transmit diversity based on DMRS demodulation to improve reliability.For example, the method such as SFBC or random precoding (RandomBeamforming); Another kind of transmission mode is for the treatment of the specific PDSCH of UE, this transmission mode can be with to send the method for dynamic PDSCH based on DMRS in existing system identical, the for example downlink transfer pattern 9/10 in existing system, send the reference signal of precoding by DMRS port, and PDSCH and DMRS adopt identical pre-coding matrix to carry out precoding.

To the broadcast of other except P-BCH in system, because these message also will cover full community user, thus the DMRS sequence that they can multiplexing P-BCH.

Suppose that P-BCH adopts the transmit diversity techniques of SFBC, and in the middle of occupied bandwidth

individual PRB couple can be at this

individual PRB on take two DMRS ports and send reference signals.To a DMRS port, can be all

individual PRB is identical to the pre-coding matrix of upper employing, thereby can be at this

individual PRB on carry out joint channel estimation strengthen channel estimating performance; Or, can be handle

individual PRB for example, to further grouping,

equal 6 and can resolve into two groups of 3+3, thus 3 continuous P RB of every group on pre-coding matrix be identical, can carry out joint channel estimation, two groups can adopt different pre-coding matrixes, thereby obtain space diversity gain.To a kind of rear method, when other broadcast messages are not the transmit diversity techniques that adopts SFBC, but while adopting the method for for example random pre-coding matrix of other technologies, because the pre-coding matrix of every group is different, these PRB for P-BCH on while sending other broadcast messages, increased space diversity gain.

Suppose that P-BCH adopts the transmit diversity techniques of random precoding, and in the middle of occupied bandwidth

individual PRB couple can be at this

individual PRB on take two DMRS ports and send reference signals.To a DMRS port, can be that each PRB is different to the pre-coding matrix of upper employing, thereby maximize space diversity gain; Or, can be handle

individual PRB for example, to further grouping,

equal 6 and can resolve into two groups of 2+2+2, thereby 2 continuous P RB of every group on pre-coding matrix be identical, can carry out joint channel estimation, strengthen channel estimating performance, three groups of PRB are to above adopting different pre-coding matrixes, thus acquisition space diversity gain.To a kind of rear method, when the DMRS sequence of the multiplexing P-BCH of other broadcast messages, also can correspondingly utilize joint channel estimation to improve channel estimating performance.

For other broadcasts except P-BCH, the concrete mode of introducing the DMRS sequence of multiplexing P-BCH is described in detail below.

In the time that the PRB of division that in the frequency resource for P-BCH, PRB is right and system actual bandwidth is consistent to dividing mode, because the PRB for P-BCH transmission is consistent to the PRB of division methods and PDSCH to division methods, therefore, the DMRS pattern of P-BCH and the DMRS pattern of PDSCH are also on all four, DMRS sequence that can direct multiplexing P-BCH.Wherein, in the time adopting the PRB of aforementioned the first P-BCH to dividing mode, the PRB that is fixedly installed P-BCH is that the situation that even number PRB is right is carried out to dividing according to system bandwidth, and current real system bandwidth comprises even number PRB couple; Or, adopt the PRB of aforementioned the second or the third P-BCH to dividing, all can make the PRB of P-BCH consistent to dividing with the PRB of system actual bandwidth to dividing.

The first is described below and determines the method for the DMRS sequence of other broadcast messages except P-BCH.The PRB of other broadcast messages of scheduled transmission to resource on, to comprising the PRB couple for the RE of P-BCH, directly utilize the DMRS sequence of P-BCH to carry out channel estimating; And to not comprising the PRB couple for the RE of P-BCH, generate DMRS sequence and carry out channel estimating according to the DMRS sequence generating method of other broadcast messages for except P-BCH.For example, for the DMRS sequence generating method of other broadcast messages except P-BCH can be the generation method of the DMRS of the downlink transfer pattern 9/10 of existing system.Take general CP as example, note DMRS modulation symbol sequence is r (m), and its total length is

described long sequence r (m) has comprised 110 PRB to upper DMRS fragment, and it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol, the n in system bandwidth successively _pRBindividual PRB to the modulation symbol of upper DMRS is $a_{k,l}^{\left(p\right)}=w_p\left(l^{\&prime;}\right)\&CenterDot;r(3\&CenterDot;l^{\&prime;}\&CenterDot;N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\&CenterDot;n_{\mathrm{PRB}}+m^{\&prime;}),$ $n_{\mathrm{PRB}}=\mathrm{0,1},...N_{\mathrm{RB}}^{\mathrm{DL}}-1,$

that the PRB of system bandwidth is to number.Adopt this method, the PRB of other broadcast messages of scheduled transmission to resource on, comprise for the PRB of the RE of P-BCH on and other PRB on adopted the generation method of different DMRS.

The second is described below and determines the method for the DMRS sequence of other broadcast messages except P-BCH.By P-BCH is adopted to consistent DMRS modulation symbol generation method with other broadcast messages, guarantee comprise for the PRB of the RE of P-BCH to, the DMRS modulation symbol sequence fragment of other broadcast messages is identical with the DMRS modulation symbol sequence fragment of P-BCH.For example, be similar to the method for the DMRS of above-mentioned the third generation P-BCH, if P-BCH be according to system bandwidth be even number PRB to time PRB the same method of division methods is divided to PRB couple, first adopt the method consistent with P-BCH to produce long modulation symbol sequence, for example produce the long modulation symbol sequence of DMRS according to 110 right demands of PRB, and fixing the correspondence in the middle of long modulation symbol sequence

the sequence fragment that individual PRB is right transmits for DMRS.Take general CP as example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively; System bandwidth is comprised to the situation that even number PRB is right, corresponding PRB is to index range

dMRS fragment for system bandwidth individual PRB is to upper DMRS transmission.N in system bandwidth _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS $a_{k,l}^{\left(p\right)}=w_p\left(l^{\&prime;}\right)\&CenterDot;r(3\&CenterDot;l^{\&prime;}\&CenterDot;N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\&CenterDot;(\frac{N_{\mathrm{RB}}^{\max ,\mathrm{DL}}}{2}-\frac{N_{\mathrm{RB}}^{\mathrm{PBCH}}}{2}+n_{\mathrm{PRB}})+m^{\&prime;}),$ Wherein,

$w_p\left(i\right)=\left\{\begin{array}{cc}{\stackrel{\&OverBar;}{w}}_p\left(i\right)& (m^{\&prime;}+\frac{N_{\mathrm{RB}}^{\max ,\mathrm{DL}}}{2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="N\; RB\; DL"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">N</figure-callout>}}_{\mathrm{RB}\mathrm{DL}}^{}}{2}+n_{\mathrm{PRB}})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">mod</figure-callout>}2=0\\ {\stackrel{\&OverBar;}{w}}_p(3-i)& (m^{\&prime;}+\frac{N_{\mathrm{RB}}^{\max ,\mathrm{DL}}}{2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="N\; RB\; DL"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">N</figure-callout>}}_{\mathrm{RB}\mathrm{DL}}^{}}{2}+n_{\mathrm{PRB}})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA00002382381000031.png"\; state="\{\{state\}\}">mod</figure-callout>}2=1\end{array}\right.$

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

here w, _p(l ') adopted corresponding PRB index range

value.Adopt this to generate the method for DMRS modulation symbol sequence, the PRB of other broadcast messages of scheduled transmission to resource on, no matter whether distributed the PRB couple comprising for the RE of P-BCH, can directly think that DMRS sequence produces according to the method for above-mentioned generation DMRS sequence.In other words, if when the PRB that this method guarantees automatically in other broadcast messages of transmission is used for P-BCH to the right a part of RE of a PRB in resource, the DMRS sequence obtaining is according to the method identical with the DMRS sequence of P-BCH.Thereby in the time of other broadcast messages of UE demodulation, UE can be simply only producing according to the method described above DMRS sequence carries out channel estimating, and do not distinguish PRB to whether having comprised the RE for P-BCH.

The method that the third determines the DMRS sequence of other broadcast messages except P-BCH is described below.The PRB of other broadcast messages of scheduled transmission to resource on, to comprising the PRB couple for the RE of P-BCH, adopt the DMRS sequence identical with the DMRS sequence of P-BCH, but on different DMRS ports the special DMRS that sends other broadcast messages.If for example P-BCH takies DMRS port 8 and 10, DMRS port 7 and 9 all can be with transmitting for the DMRS of other broadcast messages, here the DMRS sequence reason that requires multiplexing P-BCH is to guarantee that the DMRS of P-BCH and other broadcast messages is orthogonal on each CDM RE collection, thereby the channel estimating performance that guarantees P-BCH is unaffected, also guarantee the channel estimating performance to other broadcast messages simultaneously.Adopt this method, allow other broadcast messages beyond P-BCH, in the time that DMRS transmits, configuration is used the pre-coding matrix that is different from P-BCH.Or, if the DMRS of P-BCH just takies a CDM RE collection, for example DMRS port 7 and port 8, other broadcast messages can be to take another one CDM RE collection, for example DMRS port 9 and port one 0 so.Like this, DMRS sequence can not be subject to the restriction of P-BCH, can use the DMRS sequence for other broadcast messages according to the definition of system completely, and configuration is used the pre-coding matrix that is different from P-BCH.

The PRB adopting for P-BCH to divide and the actual PRB of system to dividing inconsistent situation, for example, adopt the PRB of aforementioned the first P-BCH to dividing mode, the PRB that is fixedly installed P-BCH is that the situation that even number PRB is right is carried out to dividing according to system bandwidth, when system bandwidth comprise odd number PRB to time, not exclusively overlapping for the time-frequency position of the DMRS pattern of P-BCH demodulation and the DMRS pattern of other broadcast messages.As shown in Figure 5, the DMRS pattern of P-BCH is to make DC component not in the frequency range of any one PRB; And DMRS pattern to other broadcast messages, centered by DC, a right frequency of PRB in the middle of system bandwidth is divided into two parts.As shown in Figure 5, on some RE, two kinds of PRB overlap to DMRS pattern corresponding to division methods, such RE has carried the DMRS of P-BCH, also be used as the DMRS signal of other broadcast messages simultaneously, on the RE of these coincidences, the DMRS signal that other broadcast messages can multiplexing P-BCH; To other RE, they are only for DMRS transmission in the DMRS of P-BCH pattern, and for fear of P-BCH is caused to interference, such RE is not used in and sends other broadcast messages; To other RE, they are only that such RE is the DMRS signal that is exclusively used in other broadcast messages for DMRS transmission in the DMRS of other broadcast messages pattern.As shown in Figure 5, be the situation that odd number PRB is right to bandwidth, subframe for the PRB that carries P-BCH to, except the RE that the DMRS of P-BCH takies, other RE are also as DMRS and be exclusively used in the demodulation of other broadcast messages.

The first is described below and determines the method for the DMRS sequence of other broadcast messages except P-BCH.The PRB of other broadcast messages of scheduled transmission to resource on, to not comprising the PRB couple for the RE of P-BCH, generate DMRS sequence and carry out channel estimating according to the DMRS sequence generating method of other broadcast messages for except P-BCH; To comprising the PRB couple for the RE of P-BCH, on the RE overlapping of the DMRS of other broadcast messages pattern and the DMRS pattern of P-BCH, the DMRS signal of direct multiplexing P-BCH.On the RE of DMRS signal that is exclusively used in other broadcast messages, can generate DMRS sequence according to the DMRS sequence generating method of other broadcast messages for except P-BCH, also can generate DMRS sequence according to the DMRS sequence generating method of P-BCH, then carry out channel estimating.And adopt this method, the PRB of other broadcast messages of scheduled transmission to resource on, comprise for the PRB of the RE of P-BCH on and other PRB on adopted the generation method of different DMRS.

The second is described below and determines the method for the DMRS sequence of other broadcast messages except P-BCH.By P-BCH is adopted to consistent DMRS modulation symbol generation method with other broadcast messages, guarantee that be identical comprising for the PRB of the RE of P-BCH to the DMRS modulation symbol on the RE of, the DMRS pattern of other broadcast messages and the intersection of the DMRS pattern of P-BCH.Be similar to the method for the DMRS of above-mentioned the third generation P-BCH, first adopt the method consistent with P-BCH to produce long modulation symbol sequence, for example produce the long modulation symbol sequence of DMRS according to 110 right demands of PRB, and fixing corresponding in the middle of long modulation symbol sequence

individual PRB is the DMRS for downlink data transmission to the sequence fragment of upper DMRS RE number.Take general CP as example, take DC as boundary, the RE to first for the CDM collection of DMRS, the little DMRS RE number below of DC sub-carrier indices is than many one of the DMRS RE number on the large DC of sub-carrier indices top; To second RE for the CDM collection of DMRS, the little DMRS RE number of sub-carrier indices is than few one of the large DMRS RE number of sub-carrier indices.For example, first adopt the method consistent with P-BCH to produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively; RE for the CDM collection of DMRS to first, corresponding sequential element index range

sequence fragment for system bandwidth

individual PRB is to the DMRS transmission on the RE of upper first CDM collection, i.e. n _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS

wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l'mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

here w _p(l ') adopted corresponding sequential element index range

value; To second RE for the CDM collection of DMRS, corresponding sequential element index range

sequence fragment for system bandwidth individual PRB is to the DMRS transmission on the RE of upper second CDM collection, i.e. n _pRBindividual PRB can be expressed as the modulation symbol fragment of upper DMRS

wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l′mod2+5

l′=0,1,2,3

m′=0,1,2

the Walsh extended code that DMRS port adopts,

here w _p(l ') adopted corresponding sequential element index range

value.

Or, the index c of the CDM collection of introducing DMRS, to above-mentioned first CDM collection, c equals 0; To above-mentioned second CDM collection, c equals 1.Formula can unified representation be, be similar to the method for the DMRS of above-mentioned the third generation P-BCH, first adopt the method consistent with P-BCH to produce long modulation symbol sequence, for example, according to the method that produces the modulation symbol of DMRS in downlink transfer pattern 8/9/10, produce the long modulation symbol sequence of DMRS according to 110 right demands of PRB, and fixing the correspondence of the centre of long modulation symbol sequence

individual PRB is the DMRS for downlink data transmission to upper DMRS sequence fragment.Take general CP as example, first produce the long sequence r (m) of DMRS modulation symbol, its total length is

it is divided into 4 parts, and every part is mapped to the RE of the DMRS that is useful on 110 PRB on an OFDM symbol successively, corresponding sequential element index range

dMRS sequence fragment for system bandwidth

individual PRB is to the DMRS transmission on the RE of upper CDM collection c.N _pRBthe modulation symbol fragment of the upper DMRS of CDM collection c that individual PRB is right can be expressed as wherein,

$k=5m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\&prime;}$

$k^{\&prime;}=\left\{\begin{array}{cc}1& p\&Element;\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\&Element;\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

l=l'mod2+5

l′=0,1,2,3

m′=0，1，2

the Walsh extended code that DMRS port adopts,

c=0,1, here, w _p(l ') adopted corresponding sequential element index range

value.

Adopt above-mentioned the second to generate the method for DMRS modulation symbol sequence, the PRB of other broadcast messages of scheduled transmission to resource on, no matter whether distributed the PRB couple comprising for the RE of P-BCH, can directly think that DMRS sequence produces according to the method for above-mentioned generation DMRS sequence.In other words, if when the PRB that this method guarantees automatically in other broadcast messages of transmission is used for P-BCH to the right a part of RE of a PRB in resource, on the coincidence RE of DMRS pattern, the DMRS sequence obtaining is according to the method identical with the DMRS sequence of P-BCH.Thereby in the time of other broadcast messages of UE demodulation, UE can be simply only producing according to the method described above DMRS sequence carries out channel estimating, and do not distinguish PRB to whether having comprised the RE for P-BCH.

The transmit diversity techniques that P-BCH adopts can be SFBC or random wave bundle figuration etc., other broadcast messages can adopt the transmit diversity techniques identical or different from P-BCH, but can determine according to method above for the DMRS sequence of other broadcast messages.

When need to be in the time that the PRB of the RE that has comprised P-BCH centering sends UE specific PDSCH, because PDSCH dispatches respectively for each UE, the pre-coding matrix of its DMRS port also arranges respectively each UE; And that the DMRS of P-BCH is community is specific, this is can receive because P-BCH needs UE all in community; So the dynamic PDSCH transmission of UE is generally not suitable for using the DMRS port of P-BCH.

To the specific PDSCH of UE, cause P-BCH hydraulic performance decline for fear of the interference to P-BCH, the following describes four kinds comprise for the PRB of the RE of P-BCH on process the method for the specific PDSCH of UE.

First method is, a PRB of the PDSCH of UE on, as long as comprised the running time-frequency resource for P-BCH, at such PRB to the interior PDSCH that does not transmit UE, thereby just do not need the interference of transmitting DMRS and then avoiding the DMRS to P-BCH yet.

Or, second method is, when a PRB of the PDSCH of UE is to having comprised the running time-frequency resource for P-BCH, and the running time-frequency resource that takies of the DMRS of PDSCH is while also conflicting with the running time-frequency resource of the DMRS of P-BCH, at such PRB to the interior PDSCH that does not send transmission UE.In other words, even when a PRB of the PDSCH of UE is to having comprised the running time-frequency resource for P-BCH, when but the running time-frequency resource that the DMRS of PDSCH takies does not conflict with the running time-frequency resource of the DMRS of P-BCH, still can carry out channel estimating based on this DMRS, and this PRB on not for the RE of P-BCH on receive transmission UE PDSCH.

Or, the third method is, comprise for a PRB of the running time-frequency resource of P-BCH to, send the DMRS of P-BCH, if base station scheduling the PDSCH of UE, and the DMRS port that scheduling PDSCH uses be a subset for the DMRS port of P-BCH, the channel estimating of DMRS that can be based on this subset, this PRB on the not RE for P-BCH on transmit the PDSCH of UE; On the contrary, if the DMRS port that the PDSCH of scheduling UE uses is not the subset for the DMRS port of P-BCH, do not transmit the PDSCH of UE.For example, suppose that P-BCH takies DMRS port 7 and DMRS port 9, if base station comprise for a PRB of the running time-frequency resource of P-BCH on dispatched UE the single current PDSCH transmission based on DMRS port 7, thereby this PRB on UE can multiplexing P-BCH DMRS port 7 carry out channel estimating and carry out single current PDSCH transmission.

To described the third method, further describe the method for the DMRS transmission of the specific PDSCH of UE.Can be PRB at scheduling UE specific PDSCH to resource on, to not comprising the PRB couple for the RE of P-BCH, generate DMRS sequence and carry out channel estimating according to the DMRS sequence generating method for the specific PDSCH of UE; To comprising the PRB couple for the RE of P-BCH, on the RE overlapping of the DMRS of the specific PDSCH of UE pattern and the DMRS pattern of P-BCH, the DMRS signal of direct multiplexing P-BCH; If exist the RE of the DMRS signal that is exclusively used in the specific PDSCH of UE upper, can generate DMRS sequence according to the DMRS sequence generating method of the specific PDSCH of UE, also can generate DMRS sequence according to the DMRS sequence generating method of P-BCH, then carry out channel estimating.And adopt this method, the PRB of the specific PDSCH of scheduled transmission UE to resource on, comprise for the PRB of the RE of P-BCH on and other PRB on adopted the transmission method of different DM RS.Or, by the specific PDSCH of P-BCH and UE being adopted to consistent DMRS modulation symbol generation method, guarantee comprise for the PRB of the RE of P-BCH to, at least the DMRS modulation symbol on the RE of the DMRS of the specific PDSCH of UE pattern and the intersection of the DMRS pattern of P-BCH is identical.Adopt this to generate the method for DMRS modulation symbol sequence, the PRB of scheduling UE specific PDSCH to resource on, no matter whether distributed the PRB couple comprising for the RE of P-BCH, can directly think that DMRS sequence produces according to the method for the DMRS sequence of the specific PDSCH of UE.Thereby in the time of the specific PDSCH of UE demodulation UE, UE can be simply only produces DMRS sequence according to the specific PDSCH of UE carry out channel estimating, and do not distinguish PRB to whether having comprised the RE for P-BCH.

Or the 4th kind of method be, comprise for a PRB of the running time-frequency resource of P-BCH to, as long as base station scheduling the PDSCH of UE, UE just such PRB on the DMRS port channel of PDSCH based on dispatching estimate and receive PDSCH.Base station dispatcher need to guarantee because the interference to P-BCH that the specific PDSCH of scheduling UE introduces is very little.Can only on the RE for P-BCH, not transmit PDSCH at PRB to interior, or can PRB on all RE on transmit PDSCH.

Corresponding to said method, the application provides respectively corresponding equipment, is described respectively below.

Fig. 6 is the structural representation that sends the base station equipment of PDSCH in the application, and this equipment comprises: signal generator module 601, Multiplexing module 602 and sending module 603.Wherein:

Signal generator module 601, for downlink data is encoded, the operation such as rate-matched and modulation, thereby generates the modulation symbol that will send;

Multiplexing module 602, carry out running time-frequency resource for the modulation symbol of PDSCH that module 601 is exported multiplexing, especially, comprised for the PRB of the RE of P-BCH to, the modulation symbol of multiplexing P-BCH and the modulation symbol of PDSCH according to the method described above, and the DMRS of multiplexing P-BCH and the DMRS of PDSCH.

Sending module 603, for sending multiplexing downstream signal afterwards.

Fig. 7 is the structural representation that receives the UE equipment of PDSCH in the application, and this equipment comprises: receiver module 701, demultiplexing module 702 and parsing module 703.Wherein:

Receiver module 701, for receiving the downstream signal of base station;

Demultiplexing module 702, obtains the modulation symbol of PDSCH for demultiplexing.Especially, comprised for the PRB of the RE of P-BCH to, according to the method described above, demultiplexing DMRS, and the modulation symbol of demultiplexing PDSCH other RE beyond the RE taking from P-BCH.

Parsing module 703, for carrying out the operations such as demodulation, rate de-matching and decoding to the PDSCH modulation symbol of demultiplexing output; Especially, according to the method described above, the DMRS demodulation PDSCH information of multiplexing P-BCH.

Adopt method and apparatus of the present invention, provide on having comprised for the right residue RE of the PRB of the RE of P-BCH and transmit the method for PDSCH, and avoid the interference to P-BCH transmission.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (18)

1. a method of transmitting PDSCH, comprising:

UE receives the control signal of base station scheduling PDSCH transmission;

UE receives the PDSCH of base station scheduling, wherein, is comprising for the PRB of the RE of P-BCH, the DMRS demodulation PDSCH information of multiplexing P-BCH.

2. method according to claim 1, is characterized in that, the division methods that PRB is right in the frequency resource for P-BCH is: fixing according to system bandwidth be even number PRB to time PRB division methods is divided.

3. method according to claim 1, is characterized in that, the DMRS sequence of described P-BCH determines that mode is: produce the long scrambler sequence of regular length, and corresponding PRB index range in described long scrambler sequence

sequence fragment or the centre of described long scrambler sequence individual PRB is the DMRS transmission for P-BCH to upper sequence fragment; Wherein,

that the PRB that takies of P-BCH is to number.

4. method according to claim 1, is characterized in that, the DMRS demodulation PDSCH information of described multiplexing P-BCH comprises:

For the broadcast message of other except P-BCH in PDSCH, other broadcast messages described in the DMRS demodulation of multiplexing described P-BCH;

For the specific PDSCH of the UE in PDSCH, utilize the specific PDSCH information of UE described in the special DMRS sequence demodulation of the specific PDSCH of UE.

5. method according to claim 4, is characterized in that, to PRB in the frequency resource for P-BCH to dividing mode with the PRB of system actual bandwidth to the consistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprising: to comprising the PRB couple for the RE of P-BCH, utilize the DMRS of described P-BCH to carry out channel estimating, and this PRB of demodulation is to upper described other broadcast messages;

The method further comprises: to do not comprise for the PRB of the RE of P-BCH to, generates DMRS sequence according to the DMRS sequence generating method of described other broadcast messages and carry out channel estimating, and this PRB of demodulation is to upper described other broadcast messages.

6. method according to claim 4, is characterized in that, to PRB in the frequency resource for P-BCH to dividing mode with the PRB of system actual bandwidth to the consistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: adopt the method identical with the DMRS sequence that generates P-BCH to generate the DMRS sequence of described other broadcast messages, comprise for the PRB of the RE of P-BCH to, utilize the DMRS modulation symbol sequence fragment of other broadcast messages identical with the DMRS modulation symbol sequence fragment of described P-BCH, carry out channel estimating, and this PRB of demodulation is to upper described other broadcast messages.

7. method according to claim 4, is characterized in that, to PRB in the frequency resource for P-BCH to dividing mode with the PRB of system actual bandwidth to the consistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource,

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: comprise for the PRB of the RE of P-BCH to, adopt other broadcast messages and the DMRS sequence identical with the DMRS sequence of P-BCH described in being exclusively used in of transmitting on other DMRS ports except the DMRS port of described P-BCH to carry out channel estimating, and this PRB is carried out to demodulation to upper described other broadcast messages.

8. method according to claim 4, it is characterized in that, to PRB in the frequency resource for P-BCH to the PRB of dividing mode and system actual bandwidth to the inconsistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: on the RE overlapping at the DMRS of the DMRS of P-BCH pattern and described other broadcast messages pattern, the DMRS sequence of multiplexing P-BCH is carried out channel estimating, and carries out the demodulation of described other broadcast messages; To being only present in the RE in the DMRS pattern of P-BCH, be not used in DMRS sequence and the modulation symbol of other broadcast messages of transmission; To being only present in the RE in the DMRS pattern of other broadcast messages, utilizing the DMRS sequence that is exclusively used in other broadcast messages to carry out channel estimating, and carry out the demodulation of described other broadcast messages.

9. method according to claim 8, is characterized in that, the generation method of the DMRS sequence of described other broadcast messages is identical or different with the DMRS sequence generating method of described P-BCH.

10. method according to claim 4, it is characterized in that, to PRB in the frequency resource for P-BCH to the PRB of dividing mode and system actual bandwidth to the inconsistent situation of dividing mode, scheduling for the PRB that transmits described other broadcast messages to resource

Other broadcast messages described in the DMRS demodulation of described multiplexing P-BCH, comprise: adopt the method identical with the DMRS sequence that generates P-BCH to generate the DMRS sequence of described other broadcast messages, comprise for the PRB of the RE of P-BCH to, utilize the DMRS sequence of described other broadcast messages to carry out the demodulation of channel estimating and described other broadcast messages.

11. methods according to claim 10, is characterized in that, the method that generates the DMRS sequence of described other broadcast messages comprises: produce the long scrambler sequence of regular length, and corresponding in the middle of described long scrambler sequence

individual PRB is the DMRS transmission for described other broadcast messages to the sequence fragment of upper DMRS RE number,

that the PRB of system bandwidth is to number.

12. methods according to claim 11, is characterized in that, corresponding in the middle of by described long scrambler sequence

when individual PRB transmits for the DMRS of described other broadcast messages the sequence fragment of upper DMRS RE number, RE to first for the CDM collection of the DMRS of described other broadcast messages, take DC as boundary, the little DMRS RE number of sub-carrier indices is than many one of the large DMRS RE number of sub-carrier indices; To second RE for the CDM collection of the DMRS of described other broadcast messages, the little DMRS RE number of sub-carrier indices is than few one of the large DMRS RE number of sub-carrier indices.

13. methods according to claim 4, it is characterized in that, the method further comprises: when described UE receives the specific PDSCH of UE of base station scheduling, to the specific PDSCH of UE, comprise for the PRB of the RE of P-BCH on do not receive for transmitting the specific PDSCH of UE.

14. methods according to claim 4, it is characterized in that, the method further comprises: when described UE receives the specific PDSCH of UE of base station scheduling, to the specific PDSCH of UE, comprise for the PRB of the RE of P-BCH to, if the running time-frequency resource that the DMRS of the specific PDSCH of UE of base station scheduling takies conflicts with the running time-frequency resource of the DMRS of P-BCH, at this PRB to the interior specific PDSCH of UE that do not receive.

15. methods according to claim 4, it is characterized in that, when described UE receives the specific PDSCH of UE of base station scheduling, if the DMRS port that the specific PDSCH of UE uses is a subset for the DMRS port of P-BCH, the PRB of the RE that comprises P-BCH on receive the specific PDSCH of described UE of base station scheduling.

16. methods according to claim 15, is characterized in that,

For the PRB couple comprising for the RE of P-BCH, on the RE overlapping of the DMRS of the specific PDSCH of UE pattern and the DMRS pattern of P-BCH, the DMRS signal of the multiplexing P-BCH of the specific PDSCH of UE; On the RE of DMRS signal that is exclusively used in the specific PDSCH of UE, generate DMRS sequence according to the DMRS sequence generating method of the DMRS sequence generating method of the specific PDSCH of UE or P-BCH, for carrying out channel estimating and the demodulation of the specific PDSCH of corresponding described UE;

Or,

Adopt the method identical with the DMRS sequence that generates P-BCH to generate the DMRS sequence of the specific PDSCH of described UE, comprise for the PRB of the RE of P-BCH to, utilize the DMRS sequence of the specific PDSCH of described UE to carry out the demodulation of channel estimating and the specific PDSCH of described UE.

17. 1 kinds send the base station equipment of PDSCH, it is characterized in that, comprising:

Signal generator module, for downlink data is encoded, rate-matched and modulation operations, the modulation symbol that generation will send;

Multiplexing module, multiplexing for the modulation symbol of PDSCH being carried out to running time-frequency resource; Wherein, comprised for the PRB of the RE of P-BCH to, the modulation symbol of multiplexing P-BCH and the modulation symbol of PDSCH, the DMRS of other broadcast messages in the DMRS of multiplexing P-BCH and described PDSCH except described P-BCH;

Sending module, for sending multiplexing downstream signal afterwards.

18. 1 kinds receive the UE equipment of PDSCH, it is characterized in that, comprising:

Receiver module, for receiving the downstream signal of base station;

Demultiplexing module, obtains the modulation symbol of PDSCH for demultiplexing; Wherein, comprising for the PRB of the RE of P-BCH, demultiplexing DMRS, and the modulation symbol of demultiplexing PDSCH other RE beyond the RE taking from P-BCH;

Parsing module, for carrying out demodulation, rate de-matching and decode operation to the PDSCH modulation symbol of demultiplexing output; Wherein, other broadcast messages except described P-BCH in the DMRS demodulation PDSCH of multiplexing described P-BCH.

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