CN102217348A - A method and system for assigning reference signals in a multi-antenna context - Google Patents
A method and system for assigning reference signals in a multi-antenna context Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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Abstract
A method and system of assigning reference signals to antennas and nodes in a wireless communication system comprising N number of transmitting nodes, wherein N is an integer, N = 1, is disclosed. The transmitting nodes are transmitting reference signals in a first slot and a second slot within sub-frames, over the same bandwidth. Each node has at least one transmit antenna, wherein different nodes can have different number of transmit antennas. The reference signals are of two different types, a first type of reference signals used for demodulation, and a second type of reference signals used for measurements. Reference signals of the first type is assigned to a number of transmitting nodes with at least one transmit antenna in the first and second slot in a predefined bandwidth; and reference signals of the second are type to at least one transmitting node with at least transmit antennas in at least one of the first and second slot in a predefined bandwidth.
Description
Technical field
The present invention relates to a kind of antenna and node method and system of assigning reference signal in wireless communication system.Also relate to the computer program that is used for described method and system.
Background technology
In communication system, use different types of reference signal.A kind of reference signal is used to estimate to enable the required channel of coherent demodulation of the received signal that contains control and data message.Another kind of reference signal is used for channel quality measurement and enables scheduling.
For instance, in 3GPP LTE up link, the reference signal that is used for coherent demodulation is called demodulated reference signal (DRS), and the reference signal that is used for channel quality measurement is called detection reference signal (SRS).
SRS among the LTE and DRS reference signal include sub-district adhoc basis sequence, and it has the corresponding cyclic shift on predefine length and the time domain.In the LTE up link, described basic sequence is that Zadoff-Chu (ZC) sequence or computer produce (CG) sequence.When the length of basic sequence during greater than 24 subcarriers, with the ZC sequence as basic sequence.Otherwise generation (CG) sequence uses a computer.These two kinds of sequences have the advantage that uniform amplitude is arranged on time domain and frequency domain, this point is just meeting the needs of uplink reference signals (RS).Cyclic shift is the linear phase rotation that puts on basic sequence on the frequency domain.Linear phase shift on this frequency domain is equal to the cyclic shift on the time domain.The different value of cyclic shift is used for producing different orthogonal reference signal in the sub-district from a basic sequence.
In multi-user comm, the a plurality of users that wherein have a transmitting antenna launch in same frequency band simultaneously, with the same among the LTE up link DRS corresponding to multiuser MIMO or LTE up link SRS, a cyclic shift is used to produce each user's reference signal.Because the reference signal corresponding to the user is a quadrature,, cyclic shift value and reference signal separate different user so being used in receiver-side.
In the LTE up link, predefine in the uplink sub-frames and different symbols are exclusively used in transmitted reference signal (RS), and it is graphic extension in Fig. 1.Under the situation of normal cyclic prefix (CP), DRS takies the 4th symbol of each uplink time slot, and SRS launches in last symbol of some subframes that disposed by eNB.DRS of each subscriber equipment (UE) and the emission of SRS are independently.If UE of scheduling in a plurality of Resource Block (RB) in a subframe, to be used for transmit physical uplink shared channel (PUSCH), so this UE will be on the 4th symbol of two time slots of described subframe emission length equal the DRS of the bandwidth of being dispatched.Transmitted bandwidth and the subframe of SRS are disposed by eNB.Even UE is not scheduled for data or control emission, it still can launch SRS in last symbol of second time slot in the SRS emission subframe that is configured.
For up link DRS, a plurality of users use the different cyclic shifts of basic sequence, and only just launch simultaneously under the situation of uplink multiuser MIMO emission.Otherwise, different user is separated by FDM and TDM.More precisely, when having dispatched unique user in one a group of Resource Block in the LTE up link and the subframe, because a transmitting antenna is only arranged, thus only need a DRS, and therefore only use a cyclic shift, remaining cyclic shift is idle.On the other hand, for SRS, in same running time-frequency resource, dispatch a plurality of users usually, and described a plurality of users are separated by the different cyclic shifts of basic sequence.
Under the situation of MU-MIMO and SRS, for DRS, must so that the corresponding time shift between two users greater than the mode of channel delay spread to the different user distributing cyclic shift.Otherwise, when carrying out channel estimating at the receiver place, corresponding to the channel of different user with interfering with each other.Therefore, in fact be not that all available cycles displacement of basic sequence all can be used.
Suppose such situation: under the channel model of typical urban district (TU), LTE system 5MHz bandwidth operation, wherein UE speed is 3km/h.This is typical radio communication channel.According to LTE version 8, always have eight cyclic shifts and can be used for SRS and DRS, that is, code is multiplexed together to reaching eight users.If distribute continuous cyclic shift to different user in frequency domain, the time shift between the user is about 32 samples so, and this is less than TU channel delay spread (39 samples).Therefore, in order to give each user enough protections at the receiver place, must be dispensed to each user and manyly this means under the hypothesis of TU channel every a cyclic shift for multipath, only can code be multiplexed together with four among eight users.
Senior LTE is the evolution of LTE, wherein subscriber equipment (UE) or via node (RN) have to reaching four transmitting antennas, and importantly to know channel from all emitter antennas to the receiver antenna, because this information is used to data transmission to select modulation and encoding scheme, and also be used to select to be ready to use in the pre-coding matrix of emission.Select by receiver from the pre-coding matrix that the sign indicating number of available pre-coding matrix takes out the book, with channel matched and improve launch mass.Data and DRS are by same pre-coding matrix precoding, and SRS is not by precoding.Therefore, suppose this situation is considered that SRS distributes, need the SRS of each emission from the UE transmitting antenna so.When the subscriber equipment of supporting to have a plurality of antennas or via node, compare with LTE, every UE or RN must distribute a more number cyclic shift, so that distinguish each antenna and each user.In the case, eight available detection sequences exhaust rapidly.
Therefore, problem is how to estimate from the channel of a plurality of transmitting antennas to obtain quality to estimate and scheduling promptly, how to survey the channel from UE with a plurality of transmitting antennas or RN.
Another problem is the channel of how surveying from a plurality of users, supposes that some users have a plurality of transmitting antennas.
In addition, a relevant problem is how to make signaling consumption and reference signal expense remain on floor level.
Also have relevant issues are how to make interference level keep low as far as possible.
No. 2009/017363 patent documentation of WO relate to a kind of be used for making come comfortable corresponding Transmission Time Interval (TTI) do not have the reference signal of any other signal transmitting users equipment (UE) with from the reference signal that also in corresponding TTI, has another UE of data transmission, or with control signal and the multiplexed method and apparatus of reference signal in corresponding TTI, launched from another UE.The UE's of no any other signal emission can serve as detection reference signal through multiplexed reference signal among the next comfortable corresponding TTI, so that serving BS can be to the follow-up signal application link self adaptation that UE launched, perhaps described reference signal can be served as and passed on for example reference signal of state information such as resource request or service request.In this document, only solved the problem of the SRS of limited number.Other problem of mentioning still exists.
Summary of the invention
By assigning the method and system of reference signal to solve the problems referred to above according to described antenna and the node in wireless communication system of appended claims.
An advantage of the method according to this invention is, and is when different user and different transmit antennas are assigned more detection reference signal (SRS), identical among expense and the LTE.
Another advantage is that the interference level between the different reference signals is minimized.
The another advantage of the method according to this invention is to be used to indicate the signaling consumption of cyclic shift value less.
If to the reference signal of first time slot appointment corresponding to second type of at least one transmitting antenna, and if to the reference signal of second time slot appointment corresponding to second type of all the other transmitting antennas, realize another advantage under this environment so.Realize another advantage whereby: under the constant situation of total transmitting power of subscriber equipment, the transmitting power of each antenna uprises.
According to another embodiment, below be advantage: to the reference signal of first time slot appointment corresponding to second type of at least one node, and to the reference signal of second time slot appointment corresponding to second type of all the other nodes.
According to another embodiment, below be advantage: to the reference signal of first time slot appointment corresponding to second type of at least one first node, to the reference signal of second time slot appointment corresponding to second type of at least one Section Point, and to the reference signal of first time slot appointment, and to the reference signal of second time slot appointment corresponding to second type of all the other transmitting antennas of described at least one the 3rd node corresponding to second type of at least one transmitting antenna of at least one the 3rd node.
In addition, below in this environment is advantage: to the assignment of reference signals of second type that is assigned to first time slot and the different cyclic shift value of cyclic shift value to the assignment of reference signals of second type that is assigned to second time slot.
It according to another embodiment, below is advantage: the cyclic shift value that equates with cyclic shift value to the assignment of reference signals of second type that is assigned to first time slot to the assignment of reference signals of second type that is assigned to second time slot.
If, realize another advantage under this environment so if antenna is that virtual-antenna and described method are further comprising the steps of:
-before emission, use pre-coding matrix/vector to each reference signal.
In addition, below in this environment is advantage: the reference signal of the first kind is demodulated reference signal (DRS).
If the reference signal of second type is detection reference signal (SRS), realize another advantage under this environment so.
In addition, be advantage below in this environment: the reference signal of the first kind is by pre-coding matrix/vectorial precoding, and the reference signal of second type be can't help pre-coding matrix/vectorial precoding.
In addition, below in this environment is advantage: node mixes for subscriber equipment (UE), via node (RN) or UE in the wireless communication system such as LTE or senior LTE for example and RN's.
An advantage according to system of the present invention is, and is when different user and different transmit antennas are assigned more detection reference signal (SRS), identical among expense and the LTE.
Another advantage is that the interference level between the different reference signals is minimized.
Another advantage according to system of the present invention is to be used to indicate the signaling consumption of cyclic shift value less.
If control device is also assigned reference signal corresponding to second type of at least one transmitting antenna to first time slot, and assign reference signal, realize another advantage under this environment so corresponding to second type of all the other transmitting antennas to second time slot.Realize another advantage whereby: under the constant situation of total transmitting power of subscriber equipment, the transmitting power of each antenna uprises.
According to another embodiment, below be advantage: wireless communication system comprises P through scheduling node, and wherein P is an integer, and P 〉=2.Control device is also assigned corresponding at least one reference signal through second type of scheduling node to first time slot.Control device is also assigned corresponding to all the other reference signals through second type of scheduling node to second time slot.
In addition, be advantage below in this environment: control device is also assigned corresponding at least one first reference signal through second type of scheduling node to first time slot, assigns corresponding at least one second reference signal through second type of scheduling node to second time slot.Control device is also assigned corresponding at least one the 3rd reference signal through second type of at least one transmitting antenna of scheduling node to first time slot, and assigns corresponding to described at least one the 3rd reference signal through second type of all the other transmitting antennas of scheduling node to second time slot.
If control device also to the assignment of reference signals of second type that is assigned to first time slot and the different cyclic shift value of cyclic shift value to the assignment of reference signals of second type that is assigned to second time slot, is realized another advantage under this environment so.
It according to another embodiment, below is advantage: the cyclic shift value that control device also equates with cyclic shift value to the assignment of reference signals of second type that is assigned to second time slot to the assignment of reference signals of second type.
In addition, be advantage below in this environment: the reference signal of the first kind is demodulated reference signal (DRS).
If the reference signal of second type is detection reference signal (SRS), realize another advantage under this situation so.
In addition, be advantage below in this environment: node mixes for subscriber equipment (UE), via node (RN) or UE in the wireless communication system such as LTE or senior LTE for example and RN's.
Also use according to technical scheme 21 described at least one computer program and solve the problems referred to above.Described at least one computer program can directly be loaded in the internal storage of at least one digital computer, and comprises the software code part of carrying out the step of the method according to this invention when described at least one product of operation at least one computer.
An advantage of this solution is, and is when different user and different transmit antennas are assigned more detection reference signal (SRS), identical among expense and the LTE.
Another advantage is that the interference level between the different reference signals is minimized.
The another advantage of this solution is to be used to indicate the signaling consumption of cyclic shift value less.
To notice that the term that uses during this describes " comprises " that being intended to expression exists given characteristic, step or assembly, does not exist one or more other characteristics, feature, integer, assembly or its group but do not get rid of.To embodiments of the invention be described referring to accompanying drawing now, wherein:
Description of drawings
Fig. 1 illustrates the DRS in the uplink sub-frames of LTE and the graphic extension of SRS position;
Fig. 2 be according to of the present invention in wireless communication system antenna and the flow chart of the node method of assigning reference signal;
Fig. 3 illustrates a plurality of SRS that launch the subscriber equipment (UE) with a plurality of antennas on two time slots;
Fig. 4 schematically discloses the relation between virtual-antenna and the physical antenna;
Fig. 5 illustrates a plurality of SRS that launch from different user devices on two time slots;
Fig. 6 illustrates first alternative of the scene of a plurality of subscriber equipmenies that must support to have a plurality of transmitting antennas;
Fig. 7 illustrates second alternative of the scene of a plurality of subscriber equipmenies that must support to have a plurality of transmitting antennas;
Fig. 8 illustrates the mixing emission from a plurality of SRS of different user devices and different antennae;
The scene of only launching SRS on the DRS symbol that Fig. 9 illustrates at each time slot;
Figure 10 schematically discloses use the code of different nodes with a plurality of antennas is multiplexed in the distinct methods of assigning reference signal on the time slot;
Figure 11 discloses SRS and DRS uses the situation of distributing because of the orthogonalized different bandwidth of a certain code in time domain;
Figure 12 be according to of the present invention in wireless communication system antenna and the block diagram of the node system that assigns reference signal; And
Figure 13 schematically illustrates according to computer program of the present invention.
Embodiment
Disclose among Fig. 2 according to antenna and the node flow chart of assigning the method for reference signal in wireless communication system of the present invention.Described wireless communication system comprises N transmitting node, and wherein N is an integer, and N 〉=1.Transmitting node via same band in subframe first time slot and second time slot in transmitted reference signal.In addition, each node has at least one transmitting antenna, and different node can have a different numbers transmitting antenna.Reference signal have two kinds dissimilar, the reference signal of the first kind is used for demodulation, the reference signal of second type is used for measuring.Method starts from frame 50.Method continues at frame 52, is following problem proposed: the reference signal that has any first kind? if answer is negated that method continues once more execution in step 52 so.On the other hand, if answer is sure, method continues following steps at frame 54 so: the reference signal of assigning the first kind in first and second time slot in the predefine bandwidth to a plurality of transmitting nodes with at least one transmitting antenna.After this, method continues following steps at frame 56: the reference signal of assigning second type at least one of first and second time slot in described predefine bandwidth at least one transmitting node with at least two transmitting antennas.Method is finished at frame 58.
According to preferred embodiment according to method of the present invention, to the reference signal of first time slot appointment corresponding to second type of at least one transmitting antenna, and to the reference signal of second time slot appointment corresponding to second type of all the other transmitting antennas.
According to another preferred embodiment, to the reference signal of first time slot appointment corresponding to second type of at least one node, and to the reference signal of second time slot appointment corresponding to second type of all the other nodes.
According to another preferred embodiment, to the reference signal of first time slot appointment corresponding to second type of at least one first node, to the reference signal of second time slot appointment corresponding to second type of at least one Section Point, and to the reference signal of first time slot appointment, and to the reference signal of second time slot appointment corresponding to second type of all the other transmitting antennas of described at least one the 3rd node corresponding to second type of at least one transmitting antenna of at least one the 3rd node.
According to according to first alternative of method of the present invention, to the assignment of reference signals of second type that is assigned to first time slot and the different cyclic shift value of cyclic shift value to the assignment of reference signals of second type that is assigned to second time slot.
According to second alternative, the cyclic shift value that equates with cyclic shift value to the assignment of reference signals of second type that is assigned to first time slot to the assignment of reference signals of second type that is assigned to second time slot.
In LTE or senior LTE, use in another channel at physical downlink control channel (PDCCH) or arbitrary layer of place above physical layer, carry out appointment among the embodiment described herein by the control signaling from the receiver to the reflector in the physical layer.
In addition, if transmitting antenna is a virtual-antenna, so described method is further comprising the steps of:
-before emission, use pre-coding matrix/vector to each demodulated reference signal.
Preferred embodiment according to described method, the reference signal of the first kind is demodulated reference signal (DRS), and it is by pre-coding matrix/vectorial precoding, and the reference signal of second type is detection reference signal (SRS), it can't help pre-coding matrix/vectorial precoding, but is launched by antenna.
Hypothesis considers only will survey a node with a plurality of antennas under situation about being without loss of generality.In order to survey the channel of the node with a plurality of antennas, each antenna needs a SRS.A plurality of antennas of a node to be detected are divided into two antenna groups.Assign the cyclic shift in the SRS group of first time slot, because the displacement of the available cycles in the SRS group of the SRS of the antenna in first group and second time slot is used for the SRS of the antenna of second group.The cyclic shift of each antenna groups can be identical or different.In the case, use SRS that SRS and DRS be multiplexed in each antenna of emission in the subframe once.Because SRS is lower than DRS for the performance requirement of demodulation, so compare with DRS may be more sparse in the emission of SRS.In LTE, SRS is only launched in being configured subframe by the eNB in order to emission SRS, and SRS only launches in being configured last symbol of subframe.According to the method, in a time slot, the only part of the antenna of specific node is launched SRS on the DRS symbol.
Should note, in following detailed description and the figure that is associated, will use terms user equipment (UE) to be used as the embodiment of node, but the those skilled in the art is apparent, node among the present invention is not limited to subscriber equipment, but the node of other type in the wireless communication system, via node for example, also describe and the scope of appended claims in.
Be disclosed in a plurality of SRS that launch a UE on two time slots among Fig. 3 with a plurality of antennas.Suppose add up to eight of available DRS cyclic shift, promptly CS0 is to CS7, and for the UE A with individual antenna dispatches a plurality of Resource Block (RB), to carry out physical uplink link sharing channel (PUSCH) emission.CS0 is used for the DRS of this UE with demodulation PUSCH, and CS1 does not use to CS7.Do not form two SRS groups respectively to CS7 on two time slots with cyclic shift CS1.UE B has two transmitting antennas (antenna 1 and antenna 2), and needs two SRS to survey respective channels.
Therefore, can use two SRS that do not launch UE B, promptly use CDM that the DRS of the SRS of UE B and UE A is multiplexed with the DRS cyclic shift.The SRS of transmitting antenna 1 and antenna 2 in time slot 1 and time slot 2 respectively.Can be identical or different for the cyclic shift that the SRS of antenna 1 and antenna 2 distributes, for example CS4 is used for antenna 1 and 2, or CS4 and CS5 are respectively applied for the SRS of antenna 1 and 2.Owing to realized the better distribution of cyclic shift on each time slot, so the interference level between the DRS of the SRS of UE B and UE A is minimized.When each group assigns identical cyclic shift, also reduce in order to the signaling consumption of indicating cyclic shift value, because only need to indicate a cyclic shift.In addition, antenna 1 and antenna 2 can send full power, carry out on single time slot if distribute, and or not this situation so.
" antenna " mentioned above can be physical antenna or virtual-antenna.Schematically disclose the relation between virtual-antenna and the physical antenna among Fig. 4.For each virtual-antenna, the SRS that is launched is the SRS through precoding.For instance, UE has four physical antennas, and two precoding vectors are [1 11 1]
TAnd [1-1 1-1]
TOr the row of any other orthogonal matrix.In first time slot, the SRS that is launched is [1 11 1]
T* CS4, and the SRS in second time slot is [1-1 1-1]
T* CS4.
Two SRS group of resources on two time slots also can be assigned by user mode.In the case, a plurality of users are divided into two groups.With cyclic shift available on first time slot, or a SRS group, be assigned to first groups of users, and cyclic shift available on second time slot is assigned to second groups of users.This situation is based on following hypothesis: as mentioned above, UE need not launch SRS twice in a subframe, and therefore can support different subscriber equipmenies on each time slot.With the same under the previous situation, the cyclic shift value of distributing to subscriber equipment on each time slot can be identical or different.What deserves to be mentioned is, also can be applicable to separation scene by the user through the situation of precoding.
Be disclosed in a plurality of SRS that launch on two time slots from different user devices among Fig. 5.Suppose that UE A only uses a cyclic shift CS0 to come demodulation PUSCH as DRS, and implement frequency hopping.For each SRS group of resources, there are seven available cycles displacements, promptly CS1 is to CS7.UE B and UE C need launch SRS to be used to survey uplink channel.Each UE needs a SRS.Use from a SRS group of resources the cyclic shift of assigning (CS4) in first time slot, launch the SRS of UE B, and UE C use from the 2nd SRS group of resources the cyclic shift of assigning (CS4) in second time slot, launch SRS.For the SRS sequence of UE B and UE C distribution can be identical or different.Illustrate multiplexed between SRS and the DRS among Fig. 5.
The scene of a plurality of subscriber equipmenies that must support to have a plurality of transmitting antennas will be described now.In the case, a plurality of subscriber equipment emission SRS are arranged, and each UE needs a plurality of SRS.There are two kinds of alternative to be shifted for each UE assigns the available cycles in two SRS group of resources.
Disclose first alternative among Fig. 6 or press the antenna separation.A plurality of antennas of each UE are divided into two groups, and each antenna groups is launched SRS in a time slot.
Disclose second alternative among Fig. 7 or press user's separation.The subscriber equipment of all emission SRS is divided into two groups, and each group of user equipment is launched SRS in a time slot.
About identical in the hypothesis of PUSCH emission UE A and previous two examples.In this example, do not suppose frequency hopping.Two subscriber equipmenies (UE B and UE C) emission SRS is arranged, and each UE has two transmitting antennas.
Now mixed allocation will be described.In the method, be separated into and separate on the basis and the user separates on the basis and carries out in two different groups that distribute on two time slots at antenna.Each group contains the SRS that is useful on some antenna and certain user, and as preceding institute mention and be assigned to different time-gap.
Disclose mixing emission among Fig. 8 from a plurality of SRS of different user devices and different antennae.Suppose to consider following situation: have a UE (UE A) sending DRS, and three different subscriber equipmenies (UE B, UE C and UED) are arranged, it each has two transmitting antennas and will survey.UE B and UE C can separate by user mode, and can separate by the antenna mode corresponding to the different antennae of UED.
ENB will dispatch a plurality of RB and be used for the DRS emission, and indication is used for the cyclic shift of DRS.In PDCCH, launch schedule information, comprise RB distribution, the index that is used for the cyclic shift of DRS, MCS etc.After UE receives schedule information among the PDCCH, it will distribute emission data and DRS in the bandwidth specific.For SRS emission, can use PDCCH to indicate the bandwidth of being distributed and be used for the index of the cyclic shift of SRS, or this information can be disposed by higher level signaling (for example RRC signaling) by eNB.
The example that provides more than all supposes to have a UE to dispatch.In fact sometimes there is not UE to be scheduled.For this situation, all cyclic shifts are all available, and can be used for launching SRS, promptly only launch SRS in the DRS of each time slot character position, and this gives graphic extension in Fig. 9.
Schematically disclose to use code to be multiplexed in the distinct methods of assigning reference signal on the time slot among Figure 10 to different nodes with a plurality of antennas.Figure 10 separates by the user by general description or separates by antenna and summarizes an example and a scene in the scheme.By numeral 1, the 2 and 3 different groups that illustrate corresponding to the detection reference signal of user or antenna.As mentioned above, make detection and demodulated reference signal multiplexed.Method C indication is only carried out the distribution of detection reference signal on a time slot situation.In the method, code is multiplexed together with group 1,2 and 3.Method B and method A all are described in the situation of surveying distribution on two time slots.Method B indication uses different cyclic shifts to distribute on two time slots with group 1 and 2.In the case, cyclic shift is distributed on two time slots, thereby compares with first kind of situation, and therebetween better separation and still less interference are provided.Method A is described in the situation of distributing on two time slots, wherein distributes for difference and only uses cyclic shift.As mentioned above, use this solution, guaranteed less interference and less signaling consumption.
Disclose SRS bandwidth and DMRS bandwidth among Figure 11 as long as keep quadrature with regard to unequal situation.Preferably, this property of orthogonality is to realize by means of the quadrature overlay code in the time domain.
Disclose among Figure 12 according to antenna and the node block diagram of assigning the system 10 of reference signal in wireless communication system 12 of the present invention.In the ordinary course of things, wireless communication system 12 comprises N transmitting node 14
1..., 14
N, wherein N is an integer, and N 〉=1.Two transmitting nodes 14 have only been disclosed among Figure 12 for simplicity
1, 14
2Transmitting node via same band in subframe first time slot and second time slot in transmitted reference signal.Each transmitting node has at least one transmitting antenna 16
11..., 16
N1, 16
N2, and different node can have a different numbers transmitting antenna.In the system 10 that in Figure 12, discloses, transmitting node 14
1Have two transmitting antennas 16
11And 16
12, and transmitting node 14
2Only has a transmitting antenna 16
21Should point out, reference signal have two kinds dissimilar, the reference signal of the first kind is used for demodulation, the reference signal of second type is used for measuring.Can be clear that from Figure 12 system 10 also comprises control device 18, it is connected to wireless communication system 12, and in the predefine bandwidth in first time slot and second time slot to having at least one transmitting antenna 16
21A plurality of transmitting nodes 14
x, be 14 in Figure 12
2, the reference signal of the appointment first kind.Control device 18 also in the predefine bandwidth at least one in first time slot and second time slot to having at least two transmitting antennas 16
11And 16
12At least one transmitting node 14
y, be 14 in Figure 12
1, assign the reference signal of second type.
According to the preferred embodiment according to system 10 of the present invention, control device 18 is also assigned corresponding at least one transmitting antenna 16 to first time slot
11The reference signal of second type, and assign corresponding to all the other transmitting antennas 16 to second time slot
12The reference signal of second type.
According to another embodiment, in the ordinary course of things, wireless communication system 12 comprises P through scheduling user's set 20
1..., 20
P, wherein P is an integer, and P 〉=2.In Figure 12, two have only been disclosed through scheduling user's set 20
1And 20
2 Control device 18 is also assigned corresponding at least one through scheduling user's set 20 to first time slot
1The reference signal of second type.Control device 18 is also assigned corresponding to all the other through scheduling user's set 20 to second time slot
2The reference signal of second type.
Another embodiment according to system 10, control device 18 is also assigned corresponding at least one first reference signal through second type of scheduling user's set to first time slot, and assigns corresponding at least one second reference signal through second type of scheduling user's set to second time slot.Control device 18 is also assigned corresponding at least one the 3rd reference signal through second type of at least one transmitting antenna of scheduling user's set to first time slot, and assigns corresponding at least one the 3rd reference signal through second type of all the other transmitting antennas of scheduling user's set to second time slot.
In addition, according to another alternative, control device 18 is also to the assignment of reference signals of second type that is assigned to first time slot and the different cyclic shift value of cyclic shift value to the assignment of reference signals of second type that is assigned to second time slot.
According to another alternative, the cyclic shift value that control device 18 also equates with cyclic shift value to the assignment of reference signals of second type that is assigned to second time slot to the assignment of reference signals of second type.
In addition, the reference signal of the first kind is demodulated reference signal (DRS), and the reference signal of second type is detection reference signal (SRS).
Schematically illustrate among Figure 13 according to computer programs 102 more of the present invention
1..., 102
nIllustrate n different digital computer 100 among Figure 13
1..., 100
n, wherein n is an integer.Illustrate n different computer program 102 among Figure 13
1..., 102
n, this form of sentencing the CD CD illustrates.Different computer programs 102
1..., 102
nCan directly be loaded into n different computer 100
1..., 100
nInternal storage in.Each computer program 102
1..., 102
nComprise and being used at computer 100
1..., 100
n Last operation product 102
1..., 102
nShi Zhihang according to Fig. 2 software code part in steps.For instance, computer program 102
1..., 102
nCan adopt the form of floppy disc, ram disc, tape, magneto optical disk or some other proper product.
The invention is not restricted to described embodiment.It will be apparent to those skilled in the art that within the scope of the appended claims many different modifications are feasible.
Claims (23)
1. antenna and node method of assigning reference signal in wireless communication system, described wireless communication system comprises N transmitting node, wherein N is an integer, and N 〉=1, described transmitting node transmitted reference signal in first time slot in subframe and second time slot on same band, wherein each node has at least one transmitting antenna, wherein different nodes can have a different numbers transmitting antenna, described method be characterised in that described reference signal have two kinds dissimilar, the reference signal of the first kind is used for demodulation, and the reference signal of second type is used for measuring, and is that described method comprises:
In the predefine bandwidth, in described first and second time slot, assign the reference signal of the described first kind to a plurality of transmitting nodes with at least one transmitting antenna; And
Assign the reference signal of described second type in the predefine bandwidth in described first and second time slot at least one at least one transmitting node with at least two transmitting antennas.
2. the method for appointment reference signal according to claim 1 is characterized in that assigning the described predefine bandwidth of the reference signal of the described first kind to equate with the described predefine bandwidth of the reference signal of assigning described second type.
3. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2 is characterized in that
To the described reference signal of described first time slot appointment corresponding to described second type of at least one transmitting antenna;
And
To the described reference signal of described second time slot appointment corresponding to described second type of all the other described transmitting antennas.
4. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2 is characterized in that
To the described reference signal of described first time slot appointment corresponding to described second type of at least one node; And
To the described reference signal of described second time slot appointment corresponding to described second type of all the other described nodes.
5. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2 is characterized in that
To the described reference signal of described first time slot appointment corresponding to described second type of at least one first node;
To the described reference signal of described second time slot appointment corresponding to described second type of at least one Section Point;
And
To the described reference signal of described first time slot appointment corresponding to described second type of at least one transmitting antenna of at least one the 3rd node, and to the described reference signal of described second time slot appointment corresponding to described second type of all the other described transmitting antennas of described at least one the 3rd node.
6. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2 is characterized in that to the described assignment of reference signals of described second type that is assigned to described first time slot and the different cyclic shift value of cyclic shift value to the described assignment of reference signals of described second type that is assigned to described second time slot.
7. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2 is characterized in that the cyclic shift value that equates with described cyclic shift value to the described assignment of reference signals of described second type that is assigned to described second time slot to the described assignment of reference signals of described second type that is assigned to described first time slot.
8. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2, it is characterized in that described antenna is a virtual-antenna, and be that described method also is included in emission and uses pre-coding matrix or vector to each reference signal before.
9. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2, the described reference signal that it is characterized in that the described first kind is demodulated reference signal (DRS).
10. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2, the described reference signal that it is characterized in that described second type is detection reference signal (SRS).
11. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2 is characterized in that described node is subscriber equipment (UE), via node (RN) or subscriber equipment and the mixing of via node.
12. antenna and the node method of assigning reference signal in wireless communication system according to claim 1 and 2, the described reference signal that it is characterized in that the first kind is by pre-coding matrix or vectorial precoding, and the described reference signal of second type be can't help pre-coding matrix or vectorial precoding.
13. an antenna and the node in wireless communication system (12) assigned the system (10) of reference signal, described wireless communication system comprises N transmitting node (14
1..., 14
N), wherein N is an integer, and N 〉=1, described transmitting node (14
1..., 14
N) transmitted reference signal in first time slot on same band in subframe and second time slot, wherein each node has at least one transmitting antenna (16
11, 16
12, 16
21...), wherein different nodes can have a different numbers transmitting antenna, described system be characterised in that described reference signal have two kinds dissimilar, the reference signal of the first kind is used for demodulation, and the reference signal of second type is used for measuring, and is that described system (10) comprising:
Control device (18), its in the predefine bandwidth in described first time slot and in described second time slot, to having at least one transmitting antenna (16
1) a plurality of transmitting nodes (14
x) assign the reference signal of the described first kind;
And
Control device (18), it is also in the predefine bandwidth at least one in described first and second time slot, to having at least two transmitting antennas (16
Y1, 16
Y2) at least one transmitting node (14
y) assign the reference signal of described second type.
14. system according to claim 13 is characterized in that described control device assigns the reference signal of the described first kind and described second type in identical predefine bandwidth.
15. assign the system (10) of reference signal according to claim 13 or 14 described antenna and nodes in wireless communication system (12), it is characterized in that
Described control device (18) is assigned corresponding at least one transmitting antenna (16 to described first time slot
11) the described reference signal of described second type; And
Described control device is assigned corresponding to all the other described transmitting antennas (16 to described second time slot
12) the described reference signal of described second type.
16. assign the system (10) of reference signal according to claim 13 or 14 described antenna and nodes in wireless communication system (12), it is characterized in that
Described wireless communication system (12) comprises P through scheduling node (20
1..., 20
P), wherein P is an integer, and P 〉=2, described control device (18) is assigned corresponding at least one through scheduling node (20 to described first time slot
1) the described reference signal of described second type; And
Described control device (18) is assigned described through scheduling node (20 corresponding to all the other to described second time slot
2..., 20
P) the described reference signal of described second type.
17. antenna and the node in wireless communication system (12) according to claim 16 assigned the system (10) of reference signal, it is characterized in that
Described control device (18) is assigned corresponding at least one first through scheduling node (20 to described first time slot
1) the described reference signal of described second type, assign corresponding at least one second through scheduling node (20 to described second time slot
2) the described reference signal of described second type; And
Described control device (18) is assigned corresponding at least one the 3rd through scheduling node (20 to described first time slot
3) at least one transmitting antenna (16
11) the described reference signal of described second type, and to described second time slot assign corresponding to described at least one the 3rd through scheduling node (20
3) all the other described transmitting antennas (16
12) the described reference signal of described second type.
18., it is characterized in that described control device (18) is to the described assignment of reference signals of described second type that is assigned to described first time slot and the different cyclic shift value of cyclic shift value to the described assignment of reference signals of described second type that is assigned to described second time slot according to claim 13 or 14 described antenna and the nodes systems (10) that assign reference signal in wireless communication system (12).
19., it is characterized in that the cyclic shift value that described control device (18) equates with described cyclic shift value to the described assignment of reference signals of described second type that is assigned to described second time slot to the described assignment of reference signals of described second type according to claim 13 or 14 described antenna and the nodes systems (10) that assign reference signal in wireless communication system (12).
20. assign the system (10) of reference signal according to claim 13 or 14 described antenna and nodes in wireless communication system (12), the described reference signal that it is characterized in that the described first kind is demodulated reference signal (DRS).
21. assign the system (10) of reference signal according to claim 13 or 14 described antenna and nodes in wireless communication system (12), the described reference signal that it is characterized in that described second type is detection reference signal (SRS).
22. assign the system (10) of reference signal according to claim 13 or 14 described antenna and nodes in wireless communication system (12), it is characterized in that described node is subscriber equipment (UE) or via node (RN).
23. one kind can directly be loaded at least one digital computer (100
1..., 100
n) internal storage in computer program (102
1..., 102
n), it comprises works as at described at least one computer (100
1..., 100
n) go up and move described at least one product (102
1..., 102
n) time carry out the software code part of step according to claim 1.
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| CN201080004447.6A CN102217348B (en) | 2009-06-22 | 2010-02-15 | A method and system for assigning reference signals in a multi-antenna context |
| CN201510120974.8A CN104767601B (en) | 2009-06-22 | 2010-02-15 | The method and system of reference signal are assigned under multiple antennas environment |
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| CNPCT/CN2009/072388 | 2009-06-22 | ||
| PCT/CN2009/072388 WO2010148550A1 (en) | 2009-06-22 | 2009-06-22 | A method and system for assigning reference signals in multi antenna context |
| PCT/IB2010/000638 WO2010150057A1 (en) | 2009-06-22 | 2010-02-15 | A method and system for assigning reference signals in a multi-antenna context |
| CN201080004447.6A CN102217348B (en) | 2009-06-22 | 2010-02-15 | A method and system for assigning reference signals in a multi-antenna context |
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Also Published As
| Publication number | Publication date |
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| CN104767601B (en) | 2018-11-20 |
| CN104767601A (en) | 2015-07-08 |
| CN102217348B (en) | 2015-02-25 |
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