CN101617489A - In wireless communication system, send the method for detection reference signal - Google Patents
In wireless communication system, send the method for detection reference signal Download PDFInfo
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Abstract
A kind of method that sends detection reference signal comprises: generation physical uplink control channel (PDCCH) makes carries uplink control information on subframe, this subframe comprises a plurality of SC-FDMA (single-carrier frequency division multiple access) code element, wherein deletes on the SC-FDMA code element in subframe and cuts described uplink control information; And side by side sending described uplink control information on the PUCCH and sending described detection reference signal on the SC-FDMA code element of cutting through deleting.Can under the situation that does not influence single-carrier property, send uplink control information and detection reference signal simultaneously.
Description
Technical field
The present invention relates to radio communication, and more specifically, relate to the method that in wireless communication system, sends detection reference signal (sounding reference signal).
Background technology
In the next generation wireless communication system, can under the limited wireless electric resources, send multi-medium data at a high speed in high quality.In order to realize this target, because radio channel has limited bandwidth, so need maximum spectral efficiency.In addition, need overcome inter symbol interference and the frequency selective fading that during sending at a high speed, takes place.
In order to improve the performance of wireless communication system, introduced the closed loop delivery plan of the channel conditions of a kind of use between base station (BS) and subscriber equipment (UE).Adaptive modulation and coding (AMC) scheme has been improved link performance by the feedback of using channel condition information by adjusting modulation and encoding scheme (MCS).
In general, UE notifies downlink channel conditions with the known form of for example CQI (CQI) to BS.BS can be from all UE receiving downlink channel conditions, and carry out frequency selective scheduling.In order to carry out frequency selective scheduling in up link, BS must know uplink channel conditions.
Reference signal is used to estimate channel conditions.BS and UE had before known this reference signal, and this reference signal also is called as pilot tone.Uplink reference signals has two types signal, that is, and and demodulated reference signal and detection reference signal.Demodulated reference signal is used to estimate to be used for the channel of data demodulates.Detection reference signal is used for not considering that the user that data send dispatches.
On uplink control channel, send various uplink control signals.The example of uplink control signal is to be used for carrying out the certainty that mixes automatic repeat requests (HARQ) to confirm the CQI (CQI) of (ACK)/negative acknowledgement (NACK) signal, indicating downlink link channel quality, pre-coding matrix index (PMI), order designator (RI) etc.
Carrying out up link by UE sends.Therefore, in order to reduce battery consumption, it is important making UE have low peak-to-average power ratio (PAPR).For this reason, can in sending, up link use modulation scheme with single-carrier property.Detection reference signal and uplink control signal are uncorrelated.Therefore, when on uplink control channel, sending detection reference signal, be difficult to keep single-carrier property.In addition, if send uplink control signal and detection reference signal separately, then be difficult to improve frequency efficiency.
Summary of the invention
Technical barrier
Seek a kind of being used in the method for wireless communication system transmission detection reference signal together with uplink control signal.
Technical solution
On the one hand, provide a kind of method that in wireless communication system, sends detection reference signal.This method comprises: generation physical uplink control channel (PUCCH) makes carries uplink control information on subframe, this subframe comprises a plurality of SC-FDMA (single-carrier frequency division multiple access) code element, wherein, delete section (puncture) uplink control information on the SC-FDMA code element in subframe; And side by side sending uplink control information on the PUCCH and sending detection reference signal through deleting on the SC-FDMA code element of cutting.
Subframe can comprise two time slots, and PUCCH can use a Resource Block in each of these two time slots in subframe.Come the extended uplink control information by orthogonal sequence in each of these two time slots that can be in subframe with different length.
In a further aspect, provide a kind of method that in wireless communication system, sends detection reference signal.This method comprises: generation physical uplink control channel (PUCCH) makes carries uplink control information on subframe, this subframe comprises first time slot and second time slot, time slot comprises a plurality of SC-FDMA code elements, come the extended uplink control information by first orthogonal sequence in first time slot and second orthogonal sequence in second time slot, wherein, the length of first orthogonal sequence is shorter than the length of second orthogonal sequence; And sending uplink control information on the PUCCH and on the SC-FDMA of first time slot code element, sending detection reference signal.
Can from the set of orthogonal sequence (1,1,1), (1, e
J2 π/3, e
J4 π/3), (1, e
J4 π/3, e
J2 π/3) middle first orthogonal sequence of selecting, and can from the set { (1,1,1,1), (1 ,-1,1 ,-1), (1 ,-1 ,-1,1) } of orthogonal sequence, select second orthogonal sequence.
In a further aspect, provide a kind of method that in wireless communication system, receives detection reference signal.This method comprises: be received in the uplink control information on the physical uplink control channel (PUCCH), this PUCCH comprises a plurality of SC-FDMA code elements, and wherein, a SC-FDMA code element is deleted cuts; And be received in the detection reference signal of deleting on the SC-FDMA code element of cutting.
Beneficial effect
Can under the situation that does not influence single-carrier property, send uplink control information and detection reference signal simultaneously, thereby reduce the battery consumption of subscriber equipment.In addition, spectrum efficiency can be improved, and the scheduling overhead that the transmission owing to detection reference signal causes can be reduced.
Description of drawings
Fig. 1 is the block diagram according to the transmitter of the embodiment of the invention.
Fig. 2 is the block diagram according to the signal generator of single-carrier frequency division multiple access (SC-FDMA) scheme.
Fig. 3 shows the structure of radio frame.
Fig. 4 shows the example of the resource grid that is used for a uplink time slot.
Fig. 5 shows the structure of uplink sub-frames.
Fig. 6 shows the structure of certainty affirmation (ACK)/negative acknowledgement (NACK) channel in subframe.
Fig. 7 shows the structure of CQI (CQI) channel in subframe.
Fig. 8 shows the example of the subframe that is used to send detection reference signal.
Fig. 9 shows the structure of the ACK/NACK channel that can be sent out simultaneously with detection reference signal.
Figure 10 shows the structure of the CQI channel that can be sent out simultaneously with detection reference signal.
Figure 11 shows the example that sends detection reference signal and ACK/NACK information in subframe simultaneously.
Figure 12 shows the example of two types physical uplink control channel (PUCCH).
Figure 13 shows subscriber equipment under the situation that is used to be described in the help that does not have other element (UE) can know that existence is from the situation of the signaling of base station (BS) and the example of reverse situation.
Figure 14 shows the example of the situation that Class1 control channel and type 2 control channels do not coexist in a subframe.
Figure 15 shows another example of the situation that Class1 control channel and type 2 control channels do not coexist in a subframe.
Figure 16 shows the example that is used to describe dissimilar operations.
Figure 17 is by using probe indicator to send the flow chart of the method for detection reference signal.
Figure 18 shows the Class1 control channel in a subframe and the example of the compossibility between type 2 control channels.
Figure 19 shows Class1 control channel in a subframe and another example of the compossibility between type 2 control channels.
Figure 20 shows the example of the dispatching method of being carried out by BS.
Figure 21 shows at 4 UE and organizes the example that sends detection reference signal.
Figure 22 shows at 9 UE and organizes the example that sends detection reference signal.
Figure 23 shows at 9 UE and organizes another example that sends detection reference signal.
Figure 24 shows the example that sends detection reference signal.
Figure 25 shows another example that sends detection reference signal.
Figure 26 shows Class1 control channel and type 2 control channels when using the CQI channel.
Figure 27 shows the example that sends CQI and detection reference signal simultaneously.
Figure 28 shows another example that sends CQI and detection reference signal simultaneously.
Embodiment
In below open, down link is represented from the base station (BS) to the communication link of subscriber equipment (UE), and up link is represented the communication link from UE to BS.In down link, transmitter can be the part of BS, and receiver can be the part of UE.In up link, transmitter can be the part of UE, and receiver can be the part of BS.UE can be that fix or mobile, and can be called as another term, such as mobile radio station (MS), user terminal (UT), subscriber station (SS), wireless device etc.The fixed station that BS normally communicates by letter with UE, and can call with other term, such as Node B, base transceiver systems (BTS), access point etc.In the coverage of BS, there are one or more sub-districts.
Fig. 1 is the block diagram according to the transmitter of the embodiment of the invention.
With reference to figure 1, transmitter 100 comprises detection reference signal maker 110, control channel maker 120, data processor 130, physical resource mapper 140 and signal generator 150.
Detection reference signal maker 110 generates detection reference signal.Reference signal has two types signal, that is, and and demodulated reference signal and detection reference signal.Demodulated reference signal is used for the channel estimating of data demodulates.Detection reference signal is used for uplink scheduling.The employed reference signal sequence of demodulated reference signal can be identical with the employed reference signal sequence of detection reference signal.
To suppose that hereinafter signal generator 150 uses the SC-FDMA scheme.Yet this only is used for exemplary purpose, and the present invention can also be applicable to other multiple access scheme.For example, the present invention goes for various multiple access schemes, such as OFDMA, code division multiple access (CDMA), time division multiple access (TDMA) and frequency division multiple access (FDMA).
Fig. 2 is the block diagram according to the signal generator of SC-FDMA scheme.
With reference to figure 2, signal generator 200 comprises discrete Fourier transform (DFT) (DFT) unit 220, the subcarrier mapper 230 of carrying out discrete Fourier transform (DFT) and Fast Fourier Transform Inverse (IFFT) unit 240 of carrying out Fast Fourier Transform Inverse (IFFT).DFT unit 220 pairs of inputs data are carried out DFT, and therefore export frequency domain symbols.Subcarrier mapper 230 is mapped to this frequency domain symbols on each subcarrier.The 230 pairs of input symbols in IFFT unit are carried out IFFT, and therefore export time-domain signal.
Fig. 3 shows the structure of radio frame.
With reference to figure 3, radio frame comprises 10 subframes.A subframe comprises two time slots.The time that is used to send a subframe is defined as transmission time interval (TTI).For example, a subframe can have the length of 1ms, and a time slot can have the length of 0.5ms.A time slot comprises a plurality of SC-FDMA code elements in time domain, and comprises a plurality of Resource Block in frequency domain.
The radio frame of Fig. 3 is the purpose of property and illustrating presented for purpose of illustration only.Therefore, can revise the number that is included in the subframe in the radio frame or be included in the number of the time slot in the subframe or be included in the number of the SC-FDMA code element in the time slot in every way.
Fig. 4 shows the example of the resource grid that is used for a uplink time slot.
With reference to figure 4, uplink time slot comprises a plurality of SC-FDMA code elements in time domain, and comprises a plurality of Resource Block in frequency domain.Shown in Figure 4: a uplink time slot comprises 7 SC-FDMA code elements, and a Resource Block comprises 12 subcarriers.Yet this only is used for exemplary purpose, and the present invention is not limited thereto.
Each element of resource grid is called as resource element.A Resource Block comprises 12 * 7 resource elements.The number N UL that is included in the Resource Block in the uplink time slot depends on that the up link of determining sends bandwidth in cellular cell.
Fig. 5 shows the structure of uplink sub-frames.
With reference to figure 5, uplink sub-frames is divided into control area and data area, the control area is assigned to the physical uplink control channel (PUCCH) that is used to carry uplink control information, and the data area is assigned to the physical uplink link sharing channel (PUSCH) that is used for carrying user data.The mid portion of subframe is assigned to PUSCH.The both sides of uplink sub-frames are assigned to PUCCH.A UE does not send PUCCH and PUSCH simultaneously.
The example of the uplink control information that sends on PUCCH is the certainty that is used for carry out mixing automatic repeat requests (HARQ) CQI (CQI) of confirming (ACK)/negative acknowledgement (NACK) signal, indicating downlink link channel conditions, be used to ask the scheduling request signal of uplink radio resource allocation etc.
The PUCCH use that is used for a UE takies a Resource Block of different frequency in each time slot of two time slots of subframe.These two time slots use the different resource piece (or subcarrier) in the subframe.In other words, two Resource Block distributing to PUCCH are the frequency hoppings in boundary of time slot.Here suppose PUCCH is distributed to the subframe that is used for 4 UE being associated with PUCCH (m=0), PUCCH (m=1), PUCCH (m=2), PUCCH (m=3) respectively.
PUCCH can support multiple form.That is, can send the uplink control information that has different bit numbers at each subframe according to modulation scheme.For example, when using binary phase shift keying (BPSK), can on PUCCH, send the uplink control information of 1 bit.And when using quarternary phase-shift keying (QPSK) (QPSK), can on PUCCH, send the uplink control information of 2 bits.
Fig. 6 shows the structure of the ACK/NACK channel in subframe.This ACK/NACK channel is the control channel that is used for sending ack/nack signal on PUCCH.Ack/nack signal is the uplink control information of 1 bit or 2 bits.For the sake of clarity, suppose that a time slot comprises 7 SC-FDMA code elements, and a subframe comprises two time slots.When transmitting control signal in preallocated frequency band, frequency domain expansion and time domain expansion are used to increase the number of reusable UE or the number of control channel simultaneously.
With reference to figure 6, in 7 SC-FDMA code elements in being included in a time slot, on 3 SC-FDMA code elements, carry demodulated reference signal (in the drawings by RC indication), and on remaining 4 SC-FDMA code element loading ACK/NACK signal.On 3 continuous SC-FDMA code elements, carry demodulated reference signal.The position of the code element of using in demodulated reference signal and number can change.The position of the code element of therefore, using in ack/nack signal and number also can change.Ack/nack signal is transmission and/or the confirmation of receipt signal that is used for down link data.
The frequency domain expansion sign indicating number is used for expanding ack/nack signal at frequency domain.First orthogonal code is used as the frequency domain expansion sign indicating number.Zadoff-Chu (ZC) sequence is in the permanent width of cloth zero auto-correlation (CAZAC) sequence, and is used as first orthogonal code.Yet this is the purpose of property presented for purpose of illustration only, also can use other sequence with fabulous correlation properties.Particularly, can identify each control channel by the ZC sequence that use has different cyclic shift value.
Can generate ZC sequence c (k) according to following formula with length N:
[mathematical formulae 1]
Wherein, 0≤k≤N-1, and M is radical exponent and is the natural number that is equal to or less than N that wherein N and M are relatively prime.This means that in case determined N, then the number of radical exponent just equals the number of available ZC sequence.
ZC sequence c (k) has following three characteristics.
[mathematical formulae 2]
| c (k, N, M) |=1 is used for all k, N, M
[mathematical formulae 3]
[mathematical formulae 4]
Ack/nack signal expands and stands IFFT on frequency domain.After this, be that second orthogonal code of time domain extended code is expanded ack/nack signal on time domain by use.Second orthogonal code can be Walsh (Walsh) sign indicating number.Here, 4 walsh code w0, w1, w2 and w3 that are respectively applied for 4 SC-FDMA code elements by use realize expansion.Though walsh code is used as second orthogonal code, can also use other code, such as the ZC sequence with fabulous correlation properties.
Though described before carrying out the time domain expansion and carried out frequency domain expansion, this only is used for exemplary purpose.Therefore, the invention is not restricted to carry out the order of frequency domain expansion and time domain expansion.Can before carrying out frequency domain expansion, carry out the time domain expansion.Can carry out time domain expansion and frequency domain expansion simultaneously by the sequence that use has a form of combination.
Described the ZC sequence as being first orthogonal code of frequency domain expansion sign indicating number, and with walsh code as being second orthogonal code of time domain extended code.Yet the present invention is not limited thereto.Therefore, can also use DFT sign indicating number or other sign indicating number with fabulous correlation properties.
Can make and to support the more UE of more number in the bidimensional ground expansion control information in the two of frequency domain and time domain.Suppose when carrying out frequency domain expansion, can use 6 orthogonal codes by cyclic shift by use ZC sequence.For 3 demodulated reference signals, can support 6 * 3=18 UE altogether based on the extended code of DFT by in time domain, using.In this case, the ack/nack signal that be sent out uses the orthogonal code with length 4 as the time domain extended code, thereby makes it possible to carry out coherent detection.
Fig. 7 shows the structure of the CQI channel in subframe.This CQI channel is the control channel that is used for sending CQI on PUCCH.
With reference to figure 7, in 7 SC-FDMA code elements in being included in a time slot, on 2 SC-FDMA code elements of 3 SC-FDMA code elements of each interval, carry demodulated reference signal (in the drawings by the RS indication), and on remaining 5 SC-FDMA code element, carry CQI.This only is used for exemplary purpose, and the position or the number of the position of the SC-FDMA code element of therefore using in demodulated reference signal and number or the code element used in CQI can change.When on a SC-FDMA code element, carrying out the QPSK mapping, the CQI value that can carry 2 bits.Therefore, on a time slot, can carry the CQI value of 10 bits.For a subframe, can carry the CQI value of maximum 20 bits.Except QPSK, CQI can use other modulation scheme, for example, and the 16-quadrature amplitude modulation (qam).
On frequency domain, expand CQI by using the frequency domain expansion sign indicating number.The frequency domain expansion sign indicating number can be the ZC sequence.
Different with the two-dimensional expansion in the ACK/NACK channel, the CQI channel only uses One-Dimensional Extended, and therefore improves CQI transmission capacity.Though only described frequency domain expansion here as example, the CQI channel also can use the time domain expansion.
Can be in a control channel control signal of multiplexing particular type and the control signal of other type.For example, can be in a control channel multiplexing CQI signal and ack/nack signal.
Now, subframe structure and the control channel structure that is used to send detection reference signal will be described.
Fig. 8 shows the example of the subframe that is used to send detection reference signal.This subframe can be a uplink sub-frames.
With reference to figure 8, on a SC-FDMA code element, send detection reference signal.To the position of the SC-FDMA that wherein arranges detection reference signal and number without limits.Therefore, can in two or more SC-FDMA code elements, send detection reference signal.By UE detection reference signal is sent to BS, make and to measure the uplink channel responses that is used for uplink scheduling as far as possible exactly.Detection reference signal can be sent out with once spreading all over whole uplink band, perhaps can several times spreads all over a plurality of frequency bands ground and is sent in proper order.
Detection reference signal takies a SC-FDMA code element in the subframe.Therefore, in any one of two time slots, send detection reference signal.Depend on system, do not force in each subframe, all to send detection reference signal.Can be periodically or aperiodicity ground send detection reference signal.
UE can't send PUCCH and PUSCH simultaneously.Therefore, UE can send detection reference signal and PUCCH simultaneously, and can send detection reference signal and PUSCH simultaneously, but can't send detection reference signal, PUCCH and PUSCH simultaneously.
Can in the specific SC-FDMA code element of first time slot that adjoins second time slot, send detection reference signal.This only is used for exemplary purpose, and therefore can send detection reference signal in any SC-FDMA code element of first time slot.For example, send detection reference signal in first SC-FDMA code element that can be in subframe or last the SC-FDMA code element.
When in the SC-FDMA code element that is used for sending detection reference signal thereon neither during also not multiplexing any other control information of multiplexing demodulation reference signal, can remain on the orthogonality of the control information that sends on the control channel.That is to say, in ACK/NACK channel or CQI channel, come management system, make and not arrange ack/nack signal, CQI and demodulated reference signal in the SC-FDMA code element arrange detection reference signal thereon by the design channel format.Alternatively, system is managed, and makes not generate the resource area that wherein control information and detection reference signal overlap each other.For this reason, when the resource area of wherein having distributed detection reference signal (for example, the SC-FDMA code element) when being furnished with ack/nack signal or CQI in advance, overlapping resource area is deleted cuts.
Can allow not send detection reference signal by the Resource Block that is assigned with PUCCH.Alternatively, can send detection reference signal by the Resource Block that is assigned with PUCCH.
Fig. 9 shows the structure of the ACK/NACK channel that can be sent out simultaneously with detection reference signal.
With reference to figure 9, on a SC-FDMA code element of first time slot, send detection reference signal.A quilt that is used for sending the SC-FDMA code element of ack/nack signal is deleted and is cut.Between two time slots, expand ack/nack signal asymmetricly.This is because spread all over 3 SC-FDMA code element expansion ack/nack signals in first time slot, and spreads all over 4 SC-FDMA code element expansion ack/nack signals in second time slot.
In a pair of time slot, carry out expansion by the orthogonal sequence that uses each all to have different length.For example, in first time slot, can from the set of sequence spreading (1,1,1), (1, e
J2 π/3, e
J4 π/3), (1, e
J4 π/3, e
J2 π/3) the middle sequence spreading (w that selects
0, w
1, w
2).In second time slot, can from the set { (1,1,1,1), (1 ,-1,1 ,-1), (1 ,-1 ,-1,1) } of sequence spreading, select sequence spreading (w '
0, w '
1, w '
2, w '
3).
Detection reference signal can use the ZC sequence, and is mapped to the SC-FDMA code element after carrying out IFFT.Here, for example use frequency-region signal, detection reference signal is carried out IFFT as detection reference signal.Yet, when using time-domain signal, can not carry out IFFT as detection reference signal.
In the ACK/NACK channel, on sequential and frequency domain, expand ack/nack signal.Therefore, in order to keep the orthogonality of ack/nack signal, should there be UE to send ack/nack signal being used to send on the SC-FDMA code element of detection reference signal.That is to say, send at the same time under the situation of detection reference signal and ack/nack signal that all UE in the sub-district use has the identical ACK/NACK channel of cutting off structure of deleting.
Here, last SC-FDMA code element of first time slot is deleted to cut and is used for detection reference signal.Yet the position through deleting the SC-FDMA code element of cutting is not limited thereto.Therefore, for detection reference signal, can be first SC-FDMA code element of first time slot or last SC-FDMA code element of second time slot through deleting the SC-FDMA code element of cutting.
Figure 10 shows the structure of the CQI channel that can be sent out simultaneously with detection reference signal.
With reference to Figure 10, on a SC-FDMA code element of first time slot, send detection reference signal.A quilt that is used for the SC-FDMA code element that CQI sends is deleted and is cut.In a subframe, expand CQI asymmetricly.This is because CQI spreads all over 4 SC-FDMA code elements in first time slot expands, and spreads all over 5 SC-FDMA code elements and expand in second time slot.
Detection reference signal can use the ZC sequence, and is mapped to the SC-FDMA code element after carrying out IFFT.Be different from the ACK/NACK channel, CQI only expands on frequency domain.Therefore, even a UE side by side sends detection reference signal together with CQI, other UE also can use existing C QI channel under the situation that does not have change.Though sent detection reference signal and CQI simultaneously,, need not to use the CQI channel of same structure for for all UE in the sub-district.
As mentioned above, can have with the control channel that detection reference signal is sent out simultaneously and structure that can't be different with the control channel that detection reference signal is sent out simultaneously.Can't be called as symmetrical control channel or Class1 control channel with the control channel that detection reference signal is sent out simultaneously.This is because as shown in Figure 6 and Figure 7, the resource area that is assigned to each time slot has identical size at control information.By comparison, can be called as asymmetric control channel or type 2 control channels with the control channel that detection reference signal is sent out simultaneously.This is because shown in Fig. 9 to 10, the resource area that is assigned to each time slot has different sizes at control information.
The operation of detection reference signal and control channel will be described now.
According to the PUCCH structure that proposes, in the resource area that sends detection reference signal thus (that is, the SC-FDMA code element), control information is deleted to cut, and makes side by side not send control information and detection reference signal by identical resource area.For example, on identical SC-FDMA code element, do not send ack/nack signal and detection reference signal simultaneously.Further, on identical SC-FDMA code element, do not send CQI and detection reference signal simultaneously.In addition, the signal and the detection reference signal that on identical SC-FDMA code element, have not sent ack/nack signal and CQI simultaneously wherein multiplexing.Here, term " simultaneously " means that signal is overlapping on time domain and/or frequency domain.
When on surveying the SC-FDMA code element, sending detection reference signal, on detection SC-FDMA code element, only send detection reference signal.We can say that surveying SC-FDMA is to obtain by a SC-FDMA code element in PUCCH being deleted cut.In the resource area that the transmission that is subjected to detection reference signal influences, specific UE (under the situation of CQI channel) or all UE (under the situation of ACK/NACK channel) dispose control channel by using remaining SC-FDMA code element rather than detection SC-FDMA code element.
Figure 11 shows the example that sends detection reference signal and ACK/NACK information in subframe simultaneously.
With reference to Figure 11, when surveying on the SC-FDMA code element, a UE (being called as ' UE1 ' hereinafter simply) sends detection reference signal when (being called as ' SRS ' hereinafter simply), in order to keep the single-carrier property of SC-FDMA, UE1 does not send ack/nack signal on detection SC-FDMA code element.Further, in order to keep orthogonality, other UE can't send SRS on detection SC-FDMA code element.
When sending ack/nack signal and SRS simultaneously,, when another UE sends detection SC-FDMA code element, should not send another control information in order to keep orthogonality at a UE.In addition, signal is not taken in the frequency domain and overlaps each other.
Can come multiplexing and transmission SRS and uplink control information (ack/nack signal particularly) with following variety of way.
First embodiment: the operation of two types of PUCCH
According in a subframe, defining two types PUCCH with the compossibility of SRS.For example, Class1 control channel (or symmetrical control channel) can't coexist with SRS, and type 2 control channels (or asymmetric control channel) can coexist with SRS.
Figure 12 shows the example of two types PUCCH.The Class1 control channel is general PUCCH, and when need not to send ack/nack signal and SRS simultaneously at least one Resource Block of any subframe, this general PUCCH is used to the ACK/NACK channel.During the subframe of type of service 1 control channel, another UE can send SRS by using Resource Block.Type 2 control channels are to consider the transmission of SRS and the optional PUCCH that provides.First time slot comprises is deleted the SC-FDMA code element of cutting with transmission SRS.The spreading factor (SF) that is used for sending the zone of ack/nack signal is 3 and is 4 in second time slot at first time slot.
In order to make BS successfully receive SRS, need scheduling scheme or predetermined rule, make UE not type of service 1 control channel and type 2 control channels together in identical Resource Block.Can in different Resource Block, use dissimilar control informations.
Figure 13 shows that UE can know that existence is from the situation of the signaling of BS and the example of reverse situation under the situation that is used to be described in the help that does not have other element.If the UE in the sub-district knows the SRS that is used for this UE itself and other UE and sends regularly, then need not the scheduling or the signaling of adding.This is because UE can send based on SRS and regularly independently select the PUCCH type.Send ack/nack signal and SRS simultaneously on type 2 control channels of UE in the sub-district in first subframe, and send ack/nack signal on the Class1 control channel in N subframe.In this case, Class1 control channel and type 2 control channels do not coexist in a subframe.
Figure 14 shows the example of the situation that Class1 control channel and type 2 control channels do not coexist in a subframe.In N subframe, on the Class1 control channel, do not send SRS.When type of service 2 control channels in (N+1) individual subframe, can send uplink control information and SRS simultaneously.
In addition, according to the type of the control channel described in the embodiment of Figure 13 and Figure 14, can come the executive system operation by estimated rate.For example, if in first sends type of service 1 control channel, then can type of service 2 control channels in the second and the 3rd sends, make that the Class1 control channel is 1: 2 to the ratio of type 2 control channels.Again for example, can alternately use two types control channel, make that the Class1 control channel can be 1: 1 or another ratio to the ratio of type 2 control channels.
Figure 15 shows another example of the situation that Class1 control channel and type 2 control channels do not coexist in a subframe.In N subframe, on the Class1 control channel, do not send SRS.When type of service 2 control channels in (N+1) individual subframe, can send uplink control information and SRS simultaneously.In this case, do not deleted and cut owing in type 2 control channels, survey the SC-FDMA code element, so can on PUCCH and PUSCH, send SRS simultaneously.This is an example, and this example is used to illustrate: cause must using a plurality of Resource Block or must how sending SRS effectively in the anisopleual ground of frequency domain distributes resource blocks in typical case in the increase owing to the number of control channel.In this case, spread all over whole frequency band and send SRS.
Figure 16 shows the example that is used to describe dissimilar operations.The UE that belongs to group 1 can type of service 1 control channel.The UE that belongs to group 2 can type of service 2 control channels.Therefore, Class1 control channel and type 2 control channels can coexist in a subframe.In this case, only send SRS by remaining zone (for example, interior zone) rather than by the zone that control channel uses.Can define remaining zone in every way.This be because, the number of variations of the Resource Block that uses by control channel.Therefore, can define remaining zone, make the bandwidth of SRS change along with the variation of the number of Resource Block.Further, can determine and use in-band method (in-band) arbitrarily in operation.Can provide various methods of operation to promote the operation of frequency band of detection.For example, if control channel uses altogether M Resource Block in N the Resource Block, then by using general (N-M) individual frequency band of detection to send SRS.The accurate adjusting of value (N-M) may be difficult.In this case, can use approximation to promote the transmission of SRS and multiplexing.
Probe indicator is the field that BS gives the control channel type notification UE.Probe indicator can be the part of system information, and can wait and send by using broadcast channel, downlink control channel, radio resource control (RRC) message.Can be periodically or send probe indicator aperiodically.Further, can be when UE asks or do not consider the request of UE and send probe indicator.
To the bit number of probe indicator without limits.Owing to provide two types control channel, so can represent probe indicator with a bit.The probe indicator of 1 bit can have and ' opening ' or ' pass ' corresponding value, wherein ' open ' indication and use asymmetric control channel, and symmetrical control channel is used in ' pass ' indication.This means that if probe indicator indication ' opening ', then UE can be sent in uplink control information and the SRS on detection SC-FDMA code element on the asymmetric control channel simultaneously.
Figure 17 is by using probe indicator to send the flow chart of the method for SRS.In step S310, BS sends probe indicator to UE.In step S320, UE can carry out following operation according to the indication of probe indicator.
When probe indicator indication ' opening ', the UE operation is as follows, (1) in order (for example to send uplink control information, ack/nack signal), UE is deleted the PUCCH that cuts (promptly by wherein surveying the SC-FDMA code element, asymmetric control channel) sends uplink control information, and side by side, send SRS by surveying the SC-FDMA code element.(2) if there is uplink data, then UE sends uplink data and/or control signal by PUSCH.Yet UE does not send uplink data or control signal on the SC-FDMA code element of the transmission SRS in a subframe.In fact, the frequency band of transmission SRS may be narrower than predetermined frequency band.Therefore,, then can notify this information, make and in data send, to use remaining resource if after sending SRS, also have remaining resource.
When probe indicator indication ' pass ', the UE operation is as follows.(1) in order to send uplink control information, UE sends uplink control information by general PUCCH (that is symmetrical control channel).(2) if there is uplink data, then UE sends uplink data and/or control information by PUSCH.
Figure 18 shows the Class1 control channel in a subframe and the example of the compossibility between type 2 control channels.Detection SC-FDMA code element is deleted in type 2 control channels cuts.Therefore, can on detection SC-FDMA code element, send SRS by PUSCH and PUCCH.On the Class1 control channel, do not send SRS.
Figure 19 shows Class1 control channel in a subframe and another example of the compossibility between type 2 control channels.Owing to added the Class1 control channel, reduced the zone that sends SRS on the SC-FDMA code element surveying.
Second embodiment: by the scheduling of BS execution
The BS operation dispatching makes UE not send uplink control information and SRS simultaneously.
Figure 20 shows the example of the dispatching method of being carried out by BS.If UE1 wants to send SRS in specific subframe, then send ack/nack signal on the PUCCH of BS prevention UE1 in this subframe.On the contrary, BS dispatches, and makes another UE rather than UE1 send ack/nack signal in this subframe.That is to say that BS dispatches, make a UE can't be sent in simultaneously one in the subframe SRS and the uplink control information on PUCCH.This can be by using additional signaling or realizing by sending predetermined SRS.
On the contrary, send if need not to limit the down link that is used for UE1, then BS can stop send SRS in subframe.
The 3rd embodiment: the operation of the PUCCH of single type
Can design the PUCCH in the use, make not send uplink control information and SRS by identical resource area.No matter whether send SRS, PUCCH has identical structure.That is to say, (for example be used for specific resources zone that SRS sends when sending SRS, always being to use only to specify, SC-FDMA code element (a plurality of)) under the hypothesis, no matter whether send SRS, PUCCH has this structure: only send SRS by this specific resources zone in this structure, and only transmit control signal by all the other zones except this specific resources zone.
For this reason, aforesaid asymmetric control channel structure can be used as fixing PUCCH structure.For example, in the ACK/NACK channel, first time slot uses 3 demodulated reference signal code elements and 3 ACK/NACK code elements, and all the other code elements are deleted and cut to be exclusively used in SRS.Second time slot uses 3 demodulated reference signal code elements and 4 ACK/NACK code elements.
The 4th embodiment
UE can be divided into a plurality of groups, and can organize based on these and send SRS.The one group of UE that sends SRS does not transmit control signal in corresponding subframe.
Figure 21 shows at 4 UE and organizes the example that sends SRS.Here, UE is divided into 4 groups (that is, first group, second group, the 3rd group and the 4th group).The number that is included in the UE in each group can be at least 1.These 4 groups only are used for exemplary purpose, and therefore the present invention is not limited thereto.
In Figure 21, suppose that at least one UE that belongs to group 1 sends SRS in first subframe.In this first subframe, control channel is not assigned to the UE that belongs to group 1, and is assigned to the UE that belongs to all the other groups 2,3 and 4.By only using the resource area except control channel to send SRS.Present embodiment is observed in the same asset district the not rule of demultiplex control signal and SRS.
Similarly, in second subframe, the UE that belongs to group 2 sends SRS, and control channel is assigned to the UE that belongs to group 1,3 and 4.In the 3rd subframe, the UE that belongs to group 3 sends SRS, and control channel is assigned to the UE that belongs to group 1,2 and 4.In the 4th subframe, the UE that belongs to group 4 sends SRS, and control channel is assigned to the UE that belongs to group 1,2 and 3.
In such a way, send 4 subframes, and therefore can send the SRS that is used for all groups.
Figure 22 shows at 9 UE and organizes the example that sends SRS.Than the embodiment of Figure 21, provide more group (that is, group 1 to 9), and more resources piece (or being called RB simply) is assigned to the control area.
With reference to Figure 22, organize 1 SRS if in first subframe, sent, then when sending SRS, the UE that belongs to except organizing all the other groups 2 to 9 of 1 can send control information on control channel.The SRS of group 1 and the control channel of all the other groups use the resource area of mutual exclusion, rather than use identical resource area simultaneously.Be assigned to the resource area that is used to organize 2 to 9 control channel and only be used for exemplary purpose and illustrate, and therefore the present invention is not limited to this layout.
Organize 2 SRS if sent in second subframe, then when sending SRS, the UE that belongs to except organizing all the other groups of 2 can send control information on control channel.With different in first subframe, can see that the number that is assigned to the RB of control area reduces at the place, both sides, and the index of the group of having distributed also changes in the control area.
Figure 23 shows another example that sends SRS at 9 UE.
With reference to Figure 23, organize 1 SRS if in first subframe, sent, then when sending SRS, the UE that belongs to except organizing all the other groups 2 to 9 of 1 can send control information on control channel.Than the embodiment of the Figure 21 in first time slot and second time slot, in frequency domain, arrange the control channel that is used for all the other groups symmetrically.
Can be in each subframe operation dispatching.Therefore, the number of the RB that is assigned to the control area in each subframe, the index of the group that transmits control signal be can change aperiodically, the code element of SRS or the position and the resource area scope of set of symbols are used to send.
Basically, in aforesaid method, can in subframe unit, revise configuration, and have the needs of supporting this characteristic.Change if be assigned to the number of the RB of control area, the resource area that then is assigned to SRS associated therewith also can change.The increase of number that is assigned to the RB of control area may cause being assigned to the reducing of resource area size of SRS.When the resource area that is assigned to SRS reduced, the multiplexing scheme of the SRS that uses between UE and be applied to each UE also can change.That is to say, need between SRS, revise multiplexing scheme and hopping scheme.Can transmit this information by downlink signaling.In addition, can obtain this information by using the information of distributing about uplink control channel.
Now, the various examples that will describe multiplexing SRS and uplink control information and send multiplexing signal.
Figure 24 shows the example that sends SRS.On type 2 control channels, send control information, and side by side, send SRS deleting on the detection SC-FDMA code element of cutting.In this case, not only can also on PUSCH, send SRS on the PUCCH.
Figure 25 shows another example that sends SRS.Type of service 2 control channels, and on whole frequency band, send SRS based on surveying the SC-FDMA code element.
Figure 26 shows Class1 control channel and type 2 control channels when using the CQI channel.The Class1 control channel is general PUCCH, uses this general PUCCH by CQI when need not to send SRS.During the subframe of type of service 1 channel, other UE can't send SRS on whole bandwidth.Type 2 control channels are to consider the transmission of SRS and the optional PUCCH that provides.If having arranged to be deleted in first time slot cuts the SC-FDMA code element that is used to send SRS, the number that then is used to the SC-FDMA code element of CQI transmission is 4 in first time slot and is 5 in second time slot.
Figure 27 shows the example that sends CQI and SRS simultaneously.Detection SC-FDMA code element is deleted in type 2 control channels cuts.Therefore, can on detection SC-FDMA code element, send SRS by PUSCH and PUCCH.Do not send SRS by the zone except type 2 control channels.Have only UE type of service 2 control channels that send SRS.Other UE can send CQI on the Class1 control channel.
Figure 28 shows another example that sends CQI and SRS simultaneously.Detection SC-FDMA code element is deleted in type 2 control channels cuts.Therefore, can on detection SC-FDMA code element, send SRS by PUSCH.Have only UE type of service 2 control channels that send SRS.Other UE can send CQI on the Class1 control channel.
If send CQI and SRS simultaneously, then Class1 control channel and type 2 control channels always can coexist in a subframe.This is providing convenience aspect scheduling of being carried out by BS.
Different with ACK/NACK, CQI needs the SC-FDMA code element to be deleted a section user who only is used for sending simultaneously SRS and CQI.Cut and do not influence under the situation of orthogonality need not deleting, share and identically delete another user that cut position puts and to send CQI with typical form.Therefore, than the situation that sends ACK/NACK and SRS simultaneously, can further promote system operation.
The step of the method for describing in conjunction with embodiment disclosed herein can make up by hardware, software and its and realize.Hardware can be by being designed to carry out above function application-specific integrated circuit (ASIC) (ASIC), Digital Signal Processing (DSP), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microprocessor, other electronic unit or its make up and realize.The module that is used to carry out above function can realize software.Software can be stored in the memory cell, and is carried out by processor.Memory cell or processor can adopt various device known in those skilled in the art.
Owing under the situation that does not deviate from spirit of the present invention and necessary characteristic, can embody the present invention with some forms, so it should also be understood that, unless otherwise, the foregoing description is not subjected to the restriction of any details of aforementioned description, on the contrary, should in the spirit and scope of the present invention defined in claim, broadly explain.Therefore, fall into that institute in the equivalent of the border of claim and boundary or such border and boundary changes and modification is intended to be comprised by claim.
Claims (20)
1. method that in wireless communication system, sends detection reference signal, described method comprises:
Generate physical uplink control channel (PUCCH) and be used on subframe, carrying uplink control information, described subframe comprises a plurality of SC-FDMA (single-carrier frequency division multiple access) code element, wherein, delete a section described uplink control information on the SC-FDMA code element in described subframe; And
Sending described uplink control information on the described PUCCH and sending detection reference signal through deleting on the SC-FDMA code element of cutting simultaneously described.
2. method according to claim 1, wherein, described subframe comprises two time slots, and described PUCCH uses a Resource Block in each time slots of described two time slots in the described subframe.
3. method according to claim 2, wherein, described two time slots that are used for described uplink control information use different Resource Block at frequency domain.
4. method according to claim 2 wherein, is expanded described uplink control information by the orthogonal sequence with different length in each time slot of described two time slots in described subframe.
5. method according to claim 4 wherein, is used to comprise that the length of described orthogonal sequence of a described time slot through deleting the SC-FDMA code element of cutting is shorter than the length of the described orthogonal sequence that is used for another time slot.
6. method according to claim 1, wherein, be used for described detection reference signal described be first SC-FDMA code element through deleting the SC-FDMA code element of cutting in described subframe.
7. method according to claim 1, wherein, be used for described detection reference signal described be last SC-FDMA code element through deleting the SC-FDMA code element of cutting in described subframe.
8. method according to claim 1, wherein, the bit number of described uplink control information is 1 bit or 2 bits.
9. method according to claim 1, wherein, described uplink control information is to be used for carrying out ACK (certainty affirmation)/NACK (negative acknowledgement) signal that mixes automatic repeat requests (HARQ).
10. method according to claim 1 further comprises:
Receive probe indicator from the base station, whether described probe indicator is used for indicating described detection reference signal to be sent simultaneously at described PUCCH.
11. method according to claim 1 further comprises:
Send at least one demodulated reference signal on described PUCCH, described demodulated reference signal is used to modulate described uplink control information.
12. a method that sends detection reference signal in wireless communication system, described method comprises:
Generate physical uplink control channel (PUCCH) and be used on subframe, carrying uplink control information, described subframe comprises first time slot and second time slot, time slot comprises a plurality of SC-FDMA code elements, expand described uplink control information by first orthogonal sequence in described first time slot and second orthogonal sequence in described second time slot, wherein, the length of described first orthogonal sequence is shorter than the length of described second orthogonal sequence; And
Send described uplink control information on the described PUCCH and on the SC-FDMA of described first time slot code element, sending described detection reference signal.
13. method according to claim 12, wherein, from the set of orthogonal sequence (1,1,1), (1, e
J2 π/3, e
J4 π/3), (1, e
J4 π/3, e
J2 π/3) described first orthogonal sequence of middle selection.
14. method according to claim 12 wherein, is selected described second orthogonal sequence from the set { (1,1,1,1), (1 ,-1,1 ,-1), (1 ,-1 ,-1,1) } of orthogonal sequence.
15. method according to claim 12, wherein, described first time slot that is used for described uplink control information uses different subcarriers with described second time slot.
16. method according to claim 12, wherein, the described SC-FDMA code element that is used for described detection reference signal is deleted a SC-FDMA code element of cutting on described PUCCH.
17. method according to claim 12 wherein, sends described uplink control information and described detection reference signal simultaneously in subframe.
18. a method that receives detection reference signal in wireless communication system, described method comprises:
Be received in the uplink control information on the physical uplink control channel (PUCCH), described PUCCH comprises a plurality of SC-FDMA code elements, and wherein, a SC-FDMA code element is deleted cuts; And
Be received in described through deleting the detection reference signal on the SC-FDMA code element of cutting.
19. method according to claim 18 wherein, sends described uplink control information and described detection reference signal simultaneously by subscriber equipment.
20. method according to claim 18 further comprises:
Use described detection reference signal to measure uplink channel conditions.
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