CN104767601B - The method and system of reference signal are assigned under multiple antennas environment - Google Patents

The method and system of reference signal are assigned under multiple antennas environment Download PDF

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Publication number
CN104767601B
CN104767601B CN201510120974.8A CN201510120974A CN104767601B CN 104767601 B CN104767601 B CN 104767601B CN 201510120974 A CN201510120974 A CN 201510120974A CN 104767601 B CN104767601 B CN 104767601B
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reference signal
antenna
type
node
wireless communication
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CN104767601A (en
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阿娜伊德·罗伯特萨法维
刘江华
马蒂尔斯·温斯特姆
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority claimed from PCT/CN2009/072388 external-priority patent/WO2010148550A1/en
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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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

The present invention discloses a kind of antenna into wireless communication system and node assigns the method and system of reference signal, and the wireless communication system includes N number of transmitting node, and wherein N is integer, and N >=1.The transmitting node is via same band transmitted reference signal in the first time slot and the second time slot in subframe.Each node has at least one transmitting antenna, wherein different nodes can have different number transmitting antennas.The reference signal is there are two types of different type, and the reference signal of the first kind is for demodulating, and the reference signal of Second Type is for measuring.It assigns the reference signal of the first kind to multiple transmitting nodes at least one transmitting antenna in first and second described time slot in predefined bandwidth, and assigns the reference signal of the Second Type at least one transmitting node at least transmitting antenna at least one of first and second described time slot in predefined bandwidth.

Description

The method and system of reference signal are assigned under multiple antennas environment
Technical field
The antenna and node that the present invention relates to a kind of into wireless communication system assign the method and system of reference signal.
Further relate to the computer program for the method and system.
Background technique
In a communications system, using different types of reference signal.A kind of reference signal is enabled for estimating containing control And channel needed for the coherent demodulation of the received signal of data information.Another reference signal is for channel quality measurement and opens With scheduling.
For example, in 3GPP LTE uplink, the reference signal for coherent demodulation is known as demodulated reference signal (DRS), the reference signal for being used for channel quality measurement is known as detection reference signal (SRS).
SRS and DRS reference signal in LTE includes cell adhoc basis sequence, with predefined length and time domain On correspondence cyclic shift.In LTE uplink, the basic sequence is that Zadoff-Chu (ZC) sequence or computer generate (CG) sequence.When the length of basic sequence is greater than 24 subcarriers, ZC sequence is used as basic sequence.Otherwise, using calculating Machine generates (CG) sequence.Both sequences have the advantages that there is uniform amplitude in time domain and frequency domain, and this point just meets uplink The needs of link reference signal (RS).Cyclic shift is that the linear phase rotation of basic sequence is applied on frequency domain.On this frequency domain Linear phase shift be equal to the cyclic shift in time domain.The different value of cyclic shift is used to generate from a basic sequence one small Different orthogonal reference signal in area.
In multi-user comm, wherein multiple users with a transmitting antenna send out in same frequency band simultaneously It penetrates, with the LTE uplink DRS corresponding to multiuser MIMO or LTE uplink SRS, a cyclic shift is used for Generate the reference signal of each user.Due to correspond to user reference signal be it is orthogonal, so cyclic shift value and reference Signal can be used for separating different user in receiver-side.
In LTE uplink, the predefined and different symbol in uplink subframe is exclusively used in transmitted reference signal (RS), it is illustrated in Fig. 1.In the case where normal cyclic prefix (CP), DRS occupies the of each uplink time slot 4 symbols, and SRS emits in the last symbol of some subframes configured by eNB.The DRS of each user equipment (UE) And the transmitting of SRS is independent.If dispatching a UE in multiple resource blocks (RB) in a subframe, for emitting physics Uplink shared channel (PUSCH), then this UE will emit length etc. on the 4th of the two of the subframe time slots the symbol In the DRS of scheduled bandwidth.The transmitted bandwidth and subframe of SRS is configured by eNB.Even if UE is not scheduled for data or control Transmitting still can emit SRS in the last symbol of the second time slot in the SRS transmitting subframe being configured.
For uplink DRS, multiple users use the different cyclic shifts of basic sequence, and only multi-purpose in uplink Family MIMO is just emitted simultaneously in the case where emitting.Otherwise, different user is separated by FDM and TDM.More precisely, When in LTE uplink one group of resource block and a subframe in scheduled single user when, due to only having a transmitting antenna, So only needing a DRS, and a cyclic shift is therefore used only, remaining cyclic shift is idle.On the other hand, for SRS, usually dispatches multiple users in same running time-frequency resource, and by the different cyclic shifts of basic sequence by the multiple use Family separates.
In the case where MU-MIMO and SRS, for DRS, it is necessary to so that the correspondence time shift between two users is greater than letter The mode of road delay extension is to different user distributing cyclic shift.Otherwise, when executing channel estimation at receiver, correspond to The channel of different user will be interfering with each other.Therefore, actually not all available cycles displacement of basic sequence can be used.
Assuming that such situation：Under Typical Urban (TU) channel model, LTE system 5MHz bandwidth operation, wherein UE Speed is 3km/h.This is typical radio communication channel.According to LTE version 8, a total of eight cyclic shifts can be used for SRS and DRS, that is, up to eight users code can multiplex together.If distributing continuous circulation to different user in a frequency domain Displacement, then the time shift between user is about 32 samples, this is less than TU channel delay spread (39 samples).Therefore, in order to Enough protection of each user for multipath is given at receiver, it is necessary at most recycle every one to each user distribution Displacement, it means that under the hypothesis of TU channel, four in eight users together code can only be multiplexed.
Advanced LTE is the evolution of LTE, and wherein user equipment (UE) or relay node (RN) have up to four transmitting days Line, and it is important to know from all emitter antennas to the channel of receiver antenna, because information is used to send out for data thus The pre-coding matrix penetrated selection modulation and coding scheme, and be also used to select to be ready to use in transmitting.From the code of available pre-coding matrix The pre-coding matrix taken out in book is selected by receiver, with channel matched and improve launch mass.Data and DRS are by same pre- Encoder matrix precoding, and SRS is not pre-coded.Thus, it is supposed that SRS distribution is considered to this situation, then needing to emit from UE Each of antenna emits a SRS.When supporting has the user equipment or relay node of mutiple antennas, compared with LTE, Every UE or RN must distribute greater number cyclic shift, to distinguish each antenna and each user.In the case, it can use Eight detection sequences exhaust rapidly.
Therefore, problem is how to estimate the channel from multiple transmitting antennas to obtain quality estimation and scheduling, that is, how Detect the channel from UE or RN with multiple transmitting antennas.
Another problem is how to detect the channel from multiple users, it is assumed that some users have multiple transmitting antennas.
In addition, a related problem is that signaling overheads and reference signal expense how to be made to be maintained at floor level.
It is that interference level how to be made to keep as low as possible there are one relevant issues.
No. 2009/017363 patent document of WO is related to a kind of for making from corresponding transmission time interval (TTI) Without any other signal transmitting user equipment (UE) reference signal with from also in corresponding TTI have data emit Another UE reference signal, or to emit control signal from another UE in corresponding TTI and reference signal multichannel is multiple Method and apparatus.Multiplexed reference signal from the UE without the transmitting of any other signal in corresponding TTI can Detection reference signal is served as, so that the follow-up signal application link that serving BS can be emitted to UE is adaptive or described Reference signal may act as conveying the reference signal of the status information such as resource request or service request.In this document, it only solves The problem of SRS for limited number of having determined.Other the problem of mentioning, still have.
Summary of the invention
Pass through the antenna and node appointment reference signal according to the appended claims into wireless communication system Method and system solve the above problems.
One according to the method for the present invention is the advantage is that assigning more detection to different user and different transmitting antennas When reference signal (SRS), expense is identical with LTE.
Another advantage is that the interference level between different reference signals is minimized.
Another advantage according to the method for the present invention be used to indicate cyclic shift value signaling overheads it is less.
If to the first timeslot assignments correspond at least one transmitting antenna Second Type reference signal, and if to Second timeslot assignments correspond to the reference signal of the Second Type of remaining transmitting antenna, then realizing another excellent under this environment Point.Another advantage is realized whereby：In the case where the total transmission power of user equipment is constant, the transmission power of each antenna becomes It is high.
It according to another embodiment, is advantage below：Correspond to the Second Type of at least one node to the first timeslot assignments Reference signal, and to the second timeslot assignments correspond to remaining node Second Type reference signal.
It according to yet another embodiment, is advantage below：Correspond to the second of at least one first node to the first timeslot assignments The reference signal of type corresponds to the reference signal of the Second Type of at least one second node to the second timeslot assignments, and Correspond to the reference signal of the Second Type of at least one transmitting antenna of at least one third node to the first timeslot assignments, and Correspond to the reference signal of the Second Type of remaining transmitting antenna of at least one third node to the second timeslot assignments.
In addition, following in the environment is advantage：To the Second Type for being assigned to the first time slot assignment of reference signals with The cyclic shift value different to the cyclic shift value of the assignment of reference signals for the Second Type for being assigned to the second time slot.
It according to another embodiment, is advantage below：To the Second Type for being assigned to the first time slot assignment of reference signals with The cyclic shift value equal to the cyclic shift value of the assignment of reference signals for the Second Type for being assigned to the second time slot.
If antenna is virtual-antenna and if the method also includes following steps, realize another under this environment Advantage：
Before transmission, to each reference signal application pre-coding matrix/vector.
In addition, following in the 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), another advantage under this environment is realized.
In addition, following in the environment is advantage：The reference signal of the first kind by pre-coding matrix/vector precoding, And the reference signal of Second Type is not by pre-coding matrix/vector precoding.
In addition, following in the environment is advantage：Node is the use in the wireless communication system such as LTE or advanced LTE The mixing of family equipment (UE), relay node (RN) or UE and RN.
One of the system according to the present invention is the advantage is that assigning more detection to different user and different transmitting antennas When reference signal (SRS), expense is identical with LTE.
Another advantage is that the interference level between different reference signals is minimized.
The another advantage of the system according to the present invention be used to indicate cyclic shift value signaling overheads it is less.
If control device also corresponds to the reference letter of the Second Type of at least one transmitting antenna to the first timeslot assignments Number, and the reference signal to the second timeslot assignments corresponding to the Second Type of remaining transmitting antenna, then realizing under this environment Another advantage.Another advantage is realized whereby：In the case where the total transmission power of user equipment is constant, the transmitting function of each antenna Rate is got higher.
It according to another embodiment, is advantage below：Wireless communication system includes P scheduled nodes, and wherein P is integer, And P >=2.Control device also corresponds to the reference signal of the Second Type of at least one scheduled node to the first timeslot assignments. Control device also corresponds to the reference signal of the Second Type of remaining scheduled node to the second timeslot assignments.
In addition, following in the environment is advantage：Control device also to the first timeslot assignments correspond at least one first The reference signal of the Second Type of scheduled node corresponds to the of at least one the second scheduled node to the second timeslot assignments The reference signal of two types.Control device also corresponds at least the one of the scheduled node of at least one third to the first timeslot assignments The reference signal of the Second Type of a transmitting antenna, and correspond to the scheduled section of at least one described third to the second timeslot assignments The reference signal of the Second Type of remaining transmitting antenna of point.
If control device also to the assignment of reference signals for the Second Type for being assigned to the first time slot with to being assigned to second The different cyclic shift value of the cyclic shift value of the assignment of reference signals of the Second Type of time slot, then realizing another under this environment One advantage.
It according to another embodiment, is advantage below：Control device also to the assignment of reference signals of Second Type with to appointment Give the cyclic shift value of the assignment of reference signals of the Second Type of the second time slot equal cyclic shift value.
In addition, the following are advantages in the 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), another advantage under this situation is realized.
In addition, the following are advantages in the environment：Node is the use in the wireless communication system such as LTE or advanced LTE The mixing of family equipment (UE), relay node (RN) or UE and RN.
Also solved the above problems with according at least one computer program product described in technical solution 21.It is described at least One computer program product can be loaded directly into the internal storage of at least one digital computer, and including when at least The software code partition for the step of being executed according to the method for the present invention when running at least one described product on one computer.
One of this solution to different user and different transmitting antennas the advantage is that assigning more detection with reference to letter When number (SRS), expense is identical with LTE.
Another advantage is that the interference level between different reference signals is minimized.
The another advantage of this solution be used to indicate cyclic shift value signaling overheads it is less.
It incites somebody to action note that term " includes " used in this description is intended to mean that in the presence of given characteristic, step or component, but is not arranged Except there are one or more other characteristics, feature, integer, component or its groups.The present invention is described referring now to attached drawing Embodiment, wherein：
Detailed description of the invention
Fig. 1 is painted the diagram illustrating of the position DRS and SRS in the uplink subframe of LTE；
Fig. 2 is the process for the method that the antenna into wireless communication system and node according to the present invention assign reference signal Figure；
Fig. 3 is shown in multiple SRS that transmitting on two time slots has a user equipment (UE) of mutiple antennas；
Fig. 4 schematically discloses the relationship between virtual-antenna and physical antenna；
Fig. 5 is shown in multiple SRSs of the transmitting from different user devices on two time slots；
Fig. 6 is painted the first alternative that must support to have the scene of multiple user equipmenies of multiple transmitting antennas；
Fig. 7 is painted the second alternative that must support to have the scene of multiple user equipmenies of multiple transmitting antennas；
Fig. 8 is painted the mixing transmitting of multiple SRS from different user devices and different antennae；
Fig. 9 is shown in the scene for only emitting SRS on the DRS symbol of each time slot；
Figure 10, which schematically discloses to use to be multiplexed on time slot the code of the different nodes with mutiple antennas, to be referred to Send the distinct methods of reference signal；
Figure 11 discloses SRS and DRS and uses the case where different bandwidth of orthogonalization distributes due to a certain code in the time domain；
Figure 12 is the frame for the system that the antenna into wireless communication system and node according to the present invention assign reference signal Figure；And
Figure 13 is schematically painted computer program product according to the present invention.
Specific embodiment
The method of the antenna into wireless communication system and node appointment reference signal according to the present invention is disclosed in Fig. 2 Flow chart.The wireless communication system includes N number of transmitting node, and wherein N is integer, and N >=1.Transmitting node is via identical band Transmitted reference signal in wide the first time slot and the second time slot in subframe.In addition, each node has at least one transmitting day Line, and different nodes can have different number transmitting antennas.There are two types of different type, the references of the first kind to believe for reference signal Number for demodulating, the reference signal of Second Type is for measuring.Method starts from frame 50.Method continues in frame 52, proposes following Problem：There are the reference signals of any first kind？If answer is negative, method continues to execute step 52 again. On the other hand, if answer is affirmative, method continues following steps in frame 54：First in predefined bandwidth and The reference signal of the first kind is assigned in two time slots to multiple transmitting nodes at least one transmitting antenna.Hereafter, method Continue following steps in frame 56：To at least two at least one of first and second time slot in the predefined bandwidth At least one transmitting node of a transmitting antenna assigns the reference signal of Second Type.Method is completed in frame 58.
According to the preferred embodiment of method according to the present invention, correspond at least one transmitting antenna to the first timeslot assignments Second Type reference signal, and to the second timeslot assignments correspond to remaining transmitting antenna Second Type reference signal.
According to another preferred embodiment, the reference letter of the Second Type of at least one node is corresponded to the first timeslot assignments Number, and the reference signal to the second timeslot assignments corresponding to the Second Type of remaining node.
According to another preferred embodiment, the ginseng of the Second Type of at least one first node is corresponded to the first timeslot assignments Signal is examined, the reference signal of the Second Type of at least one second node is corresponded to the second timeslot assignments, and to the first time slot The reference signal for corresponding to the Second Type of at least one transmitting antenna of at least one third node is assigned, and to the second time slot Assign the reference signal for corresponding to the Second Type of remaining transmitting antenna of at least one third node.
According to the first alternative of method according to the present invention, to the reference signal for the Second Type for being assigned to the first time slot Assign the cyclic shift value different from the cyclic shift value of the assignment of reference signals to the Second Type for being assigned to the second time slot.
According to the second alternative, to the Second Type for being assigned to the first time slot assignment of reference signals with to being assigned to second The equal cyclic shift value of the cyclic shift value of the assignment of reference signals of the Second Type of time slot.
In LTE or advanced LTE, using physical downlink control channel (PDCCH) or on a physical layer square any In another channel at layer, reality described herein is executed by the control signaling slave receiver to transmitter in physical layer Apply the appointment in example.
In addition, if transmitting antenna is virtual-antenna, then the method also includes following steps：
Before transmission, to each demodulated reference signal application pre-coding matrix/vector.
According to the preferred embodiment of the method, the reference signal of the first kind is demodulated reference signal (DRS), by pre- Encoder matrix/vector precoding, and the reference signal of Second Type is detection reference signal (SRS), not by pre-coding matrix/ Vector precoding, but emitted by antenna.
Assume to consider only to detect a node with mutiple antennas in the case where without loss of generality.In order to detect tool There is the channel of the node of mutiple antennas, each antenna needs a SRS.The mutiple antennas of a node to be detected is divided into two A antenna groups.The cyclic shift in the SRS group of the first time slot is assigned, because of the SRS of the antenna in the first group and second SRS of the available cycles displacement for the antenna in the second group in the SRS group of time slot.The cyclic shift of each antenna groups It may be the same or different.In the case, be multiplexed in using SRS and DRS emit in subframe each antenna SRS it is primary.Cause It is low for performance requirement ratio DRS of the SRS for demodulation, so the transmitting of SRS may be sparse compared with DRS.In LTE, SRS is only Emitted in being configured subframe by the eNB to emit SRS, and SRS only emits in the last symbol for being configured subframe. According to the method, in one time slot, the only a part of the antenna of specific node emits SRS on DRS symbol.
It should be noted that terms user equipment (UE) will be used as node in described in detail below and associated figure Embodiment, but those skilled in the art is it is clear that the node in the present invention is not limited to user equipment, but wirelessly communicates Other types of node in system, such as relay node, also in description and the scope of the appended claims.
The transmitting on two time slots is disclosed in Fig. 3 has multiple SRS of a UE of mutiple antennas.Assuming that available DRS The sum of cyclic shift is eight, i.e. CS0 to CS7, and is the multiple resource blocks (RB) of UE A scheduling with individual antenna, with into Row physical uplink shared channel (PUSCH) transmitting.CS0 is used for the DRS of this UE to demodulate PUSCH, and CS1 to CS7 is unused. Unused cyclic shift CS1 to CS7 on two time slots is respectively formed Liang Ge SRS group.UE B has two emitting antennas (antenna 1 and antenna 2), and two SRS is needed to detect respective channels.
Therefore, unused DRS cyclic shift can be used to emit two SRS of UE B, i.e., using CDM by the SRS of UE B with The DRS of UE A is multiplexed.The SRS of transmitting antenna 1 and antenna 2 in time slot 1 and time slot 2 respectively.For antenna 1 and antenna 2 The cyclic shift of SRS distribution may be the same or different, such as CS4 is respectively used to antenna 1 and 2 for antenna 1 and 2 or CS4 and CS5 SRS.Due to realizing preferable distribution of the cyclic shift on each time slot, so between the DRS of the SRS and UE A of UE B Interference level is minimized.When assigning identical cyclic shift to each group, to indicate that the signaling of cyclic shift value is opened Pin is also reduced, because only needing to indicate a cyclic shift.In addition, full power can be transmitted in antenna 1 and antenna 2, if distribution is It is carried out on single time slot, then being not the case.
" antenna " mentioned above can be physical antenna or virtual-antenna.Virtual-antenna and object are schematically disclosed in Fig. 4 Manage the relationship between antenna.For each virtual-antenna, the SRS emitted is the SRS through precoding.For example, UE has Four physical antennas, and two precoding vectors are [1 11 1]TAnd [1-1 1-1]TOr the column of any other orthogonal matrix. In the first slot, the SRS emitted is [1 11 1]T* CS4, and the SRS in the second time slot is [1-1 1-1]T*CS4。
Liang Ge SRS resource group on two time slots can also be assigned by user mode.In the case, by multiple users It is divided into Liang Ge group.By cyclic shift available on the first time slot or the first SRS group, it is assigned to the first groups of users, and will Available cyclic shift is assigned to second user group on second time slot.This situation be based on it is assumed hereinafter that：As described above, UE is not It needs to emit SRS twice in a subframe, and therefore can support different user equipmenies on each time slot.With previous occasion Lower the same, the cyclic shift value that user equipment is distributed on each time slot may be the same or different.It is noted that through prelisting The case where code, can also be applied to by user's separation scene.
It is disclosed in Fig. 5 and emits multiple SRS from different user devices on two time slots.Assuming that UE A is used only one Cyclic shift CS0 demodulates PUSCH as DRS, and implements frequency hopping.For each SRS resource group, there are seven available cycles Displacement, i.e. CS1 to CS7.UE B and UE C need to emit SRS for detecting uplink channel.Every UE needs one SRS.Emit the SRS of UE B in the first slot using the assigned cyclic shift (CS4) from the first SRS resource group, and UE C emits SRS in the second time slot using the assigned cyclic shift (CS4) from the second SRS resource group.For UE B and The SRS sequence of UE C distribution may be the same or different.The multiplexing being painted in Fig. 5 between SRS and DRS.
The scene that must support to have multiple user equipmenies of multiple transmitting antennas will now be described.In the case, have Multiple user equipmenies emit SRS, and every UE needs multiple SRS.It is that every UE assigns two SRS resources there are two types of alternative Available cycles displacement in group.
The first alternative is disclosed in Fig. 6 or is separated by antenna.The mutiple antennas of every UE is divided into Liang Ge group, and each Antenna groups emit SRS in one time slot.
The second alternative is disclosed in Fig. 7 or is separated by user.The user equipment of all transmitting SRS is divided into Liang Ge group, Each group of user equipment emits SRS in one time slot.
Hypothesis about PUSCH transmitting UE A is identical with first the first two example.In this example, it is not assumed that frequency hopping.Have Two user equipmenies (UE B and UE C) emit SRS, and every UE has two emitting antennas.
Mixed allocation will now be described.In this method, the different groups of two will distributed on two time slots are separated into It is to be carried out on the basis of antenna separation and on user separates basis.Each group is contained for certain antennas and certain user SRS, and it is assigned to different time-gap as previously noted.
The mixing transmitting of multiple SRS from different user devices and different antennae is disclosed in Fig. 8.Assuming that considering following feelings Condition：There is UE (UE A) sending DRS, and there are three different user equipmenies (UE B, UE C and UE D), it is each own Two emitting antennas will detect.UE B and UE C can be separated by user mode, and the different antennae corresponding to UE D can be by Antenna mode separates.
ENB will dispatch multiple RB and be used for DRS transmitting, and indicate the cyclic shift for being used for DRS.Emit scheduling in PDCCH Information, comprising RB distribution, for index, MCS of cyclic shift of DRS etc..UE receive the scheduling information in PDCCH it Afterwards, data and DRS will be emitted in specific institute's bandwidth allocation.SRS is emitted, PDCCH can be used to indicate to be distributed The index or this information of bandwidth and the cyclic shift for SRS can be matched by eNB by higher level signaling (such as RRC signaling) It sets.
All example given above assume have a UE to dispatch.It is actually sometimes scheduled without UE.For This situation, all cyclic shifts are available, and can be used for emitting SRS, i.e., only emit in the DRS character position of each time slot SRS, this is illustrated in Fig. 9.
It schematically discloses to use in Figure 10 and the code of the different nodes with mutiple antennas is multiplexed on time slot Assign the distinct methods of reference signal.Figure 10 is separated by user by summarizing or is summarized in a scheme by antenna separation Example and scene.The different groups corresponding to the detection reference signal of user or antenna are painted by number 1,2 and 3.Such as It is upper described, multiplex detection with demodulated reference signal.Method C instruction only carries out detection reference signal over a slot The case where distribution.In this method, group 1,2 and 3 together code is multiplexed.Method B and method A is described at two The case where detection distribution is carried out in gap.Method B instruction is divided on two time slots using different cyclic shifts with group 1 and 2 Match.In the case, cyclic shift is distributed on two time slots, thus compared with the first situation, provides therebetween better Separation and less interference.Method A is described the case where distributing on two time slots, is moved wherein circulation is used only for different distribution Position.As described above, ensure that less interference and less signaling overheads using this solution.
SRS bandwidth and DMRS the bandwidth unequal situation as long as keeping orthogonal are disclosed in Figure 11.Preferably, this is orthogonal Property is realized by means of the orthogonal covering codes in time domain.
Disclose that the antenna into wireless communication system 12 and node according to the present invention assign reference signal in Figure 12 is The block diagram of system 10.Under normal circumstances, wireless communication system 12 includes N number of transmitting node 141,…,14N, wherein N is integer, and N≥1.For simplicity two transmitting nodes 14 are only disclosed in Figure 121、142.Transmitting node is via same band in subframe Transmitted reference signal in interior the first time slot and the second time slot.Each transmitting node has at least one transmitting antenna 1611,…, 16N1,16N2, and different nodes can have different number transmitting antennas.In the system 10 disclosed in Figure 12, transmitting node 141 With two emitting antennas 1611And 1612, and transmitting node 142Only there is a transmitting antenna 1621.It is noted that reference signal There are two types of different type, the reference signal of the first kind is for demodulating, and the reference signal of Second Type is for measuring.From Figure 12 It is clear that system 10 further includes control device 18, be connected to wireless communication system 12, and in predefined bandwidth To at least one transmitting antenna 16 in first time slot and the second time slot21Multiple transmitting nodes 14x, it is 14 in Figure 122, Assign the reference signal of the first kind.Control device 18 also in predefined bandwidth in the first time slot and the second time slot at least To at least two transmitting antennas 16 in one11And 1612At least one transmitting node 14y, it is 14 in Figure 121, assign The reference signal of Second Type.
According to the preferred embodiment of system 10 according to the present invention, control device 18 also corresponds to extremely to the first timeslot assignments A few transmitting antenna 1611Second Type reference signal, and to the second timeslot assignments correspond to remaining transmitting antenna 1612 Second Type reference signal.
According to another embodiment, under normal circumstances, wireless communication system 12 includes P scheduled user equipmenies 201,…,20P, wherein P is integer, and P >=2.In Figure 12, two scheduled user equipmenies 20 are only disclosed1And 202.Control Device 18 also corresponds at least one scheduled user equipment 20 to the first timeslot assignments1Second Type reference signal.Control Device 18 processed also corresponds to remaining scheduled user equipment 20 to the second timeslot assignments2Second Type reference signal.
According to another embodiment of system 10, control device 18 also corresponds at least one first warp to the first timeslot assignments The reference signal of the Second Type of scheduling user's set, and correspond at least one second scheduled user to the second timeslot assignments The reference signal of the Second Type of equipment.Control device 18 also corresponds to the scheduled use of at least one third to the first timeslot assignments The reference signal of the Second Type of at least one transmitting antenna of family equipment, and to the second timeslot assignments correspond at least one the The reference signal of the Second Type of remaining transmitting antenna of three scheduled user equipmenies.
In addition, control device 18 is also to the reference signal for the Second Type for being assigned to the first time slot according to another alternative Assign the cyclic shift value different from the cyclic shift value of the assignment of reference signals to the Second Type for being assigned to the second time slot.
According to another alternative, control device 18 also to the assignment of reference signals of Second Type with to being assigned to the second time slot Second Type assignment of reference signals the equal cyclic shift value of cyclic shift value.
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).
Some computer program products 102 according to the present invention are schematically painted in Figure 131,…,102n.N is painted in Figure 13 A different digital computer 1001,…,100n, wherein n is integer.N different computer program products are painted in Figure 13 1021,…,102n, this form for sentencing CD CD is painted.Different computer program products 1021,…,102nIt can be loaded directly into The computer 100 different to n1,…,100nInternal storage in.Each computer program product 1021,…,102nIncluding For in computer 1001,…,100nUpper operation product 1021,…,102nThe software generation of all steps of Shi Zhihang according to fig. 2 Code part.For example, computer program product 1021,…,102nFloppy disc, ram disc, tape, magneto-optic disk or certain can be used The form of other proper products.
The present invention is not limited to described embodiments.It will be apparent to those skilled in the art that being wanted in appended right In the range of seeking book, many different modifications are feasible.

Claims (19)

1. a kind of method that antenna and node into wireless communication system assign reference signal, the method are characterized in that institute Stating reference signal, there are two types of different types, and the reference signal of the first kind is for demodulating, and the reference signal of Second Type is used for Measurement, and be the method includes：
To multiple transmitting nodes at least one transmitting antenna in the first time slot and the second time slot in predefined bandwidth Assign the reference signal of the first kind；And
To at least two hairs at least one of first time slot and second time slot in predefined bandwidth At least one transmitting node for penetrating antenna assigns the reference signal of the Second Type.
2. the method that the antenna and node according to claim 1 into wireless communication system assigns reference signal, special Sign is to assign the predefined bandwidth of the reference signal of the first kind and assigns the reference signal of the Second Type The predefined bandwidth it is equal.
3. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that
Correspond to the reference signal of the Second Type of at least one transmitting antenna to first timeslot assignments；And
Correspond to the reference signal of the Second Type of remaining transmitting antenna to second timeslot assignments.
4. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that
Correspond to the reference signal of the Second Type of at least one node to first timeslot assignments；And
Correspond to the reference signal of the Second Type of remaining node to second timeslot assignments.
5. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that
Correspond to the reference signal of the Second Type of at least one first node to first timeslot assignments；
Correspond to the reference signal of the Second Type of at least one second node to second timeslot assignments；And
Correspond to the Second Type of at least one transmitting antenna of at least one third node to first timeslot assignments The reference signal, and correspond to second timeslot assignments remaining described transmitting day of at least one third node The reference signal of the Second Type of line.
6. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that the reference signal for the Second Type for being assigned to first time slot and to when being assigned to described second The different cyclic shift value of the assignment of reference signals cyclic shift value of the Second Type of gap.
7. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that the reference signal for the Second Type for being assigned to first time slot and to when being assigned to described second The equal cyclic shift value of the assignment of reference signals cyclic shift value of the Second Type of gap.
8. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that the antenna is virtual-antenna, and is that the method also includes pre- to the application of each reference signal before transmission Encoder matrix or vector.
9. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, The reference signal for being characterized in that the first kind is demodulated reference signal DRS.
10. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that the reference signal of the Second Type is detection reference signal SRS.
11. the method that the antenna and node according to claim 1 or 2 into wireless communication system assigns reference signal, It is characterized in that the reference signal of the first kind is by pre-coding matrix or vector precoding, and the reference of Second Type Signal is not by pre-coding matrix or vector precoding.
12. a kind of system that antenna and node into wireless communication system assign reference signal, the system are characterized in that There are two types of different types for the reference signal, and the reference signal of the first kind is for demodulating, and the reference signal of Second Type is used In measurement, and be the system comprises：
Control device, in predefined bandwidth in the first slot and in the second time slot, to at least one transmitting day Multiple transmitting nodes of line assign the reference signal of the first kind；And
Control device, also in predefined bandwidth at least one of first time slot and second time slot, to The reference signal of the Second Type is assigned at least one transmitting node of at least two transmitting antennas.
13. the system that the antenna and node according to claim 12 into wireless communication system assigns reference signal, It is characterized in that the control device assigns the reference of the first kind and the Second Type to believe in identical predefined bandwidth Number.
14. what the antenna and node according to claim 12 or 13 into wireless communication system assigned reference signal is System, it is characterised in that
The control device corresponds to first timeslot assignments described in the Second Type of at least one transmitting antenna Reference signal；And
The control device corresponds to second timeslot assignments described in the Second Type of remaining transmitting antenna Reference signal.
15. what the antenna and node according to claim 12 or 13 into wireless communication system assigned reference signal is System, it is characterised in that
The wireless communication system includes P scheduled nodes, and wherein P is integer, and P >=2, and the control device is to described the One timeslot assignments correspond to the reference signal of the Second Type of at least one scheduled node；And
The control device corresponds to the institute of the Second Type of remaining scheduled node to second timeslot assignments State reference signal.
16. what the antenna and node according to claim 12 or 13 into wireless communication system assigned reference signal is System, it is characterised in that the reference signal from the control device to the Second Type for being assigned to first time slot with to It is assigned to the different cyclic shift value of the assignment of reference signals cyclic shift value of the Second Type of second time slot.
17. what the antenna and node according to claim 12 or 13 into wireless communication system assigned reference signal is System, it is characterised in that the reference signal from the control device to the Second Type with to being assigned to second time slot The equal cyclic shift value of the assignment of reference signals cyclic shift value of the Second Type.
18. what the antenna and node according to claim 12 or 13 into wireless communication system assigned reference signal is System, it is characterised in that the reference signal of the first kind is demodulated reference signal DRS.
19. what the antenna and node according to claim 12 or 13 into wireless communication system assigned reference signal is System, it is characterised in that the reference signal of the Second Type is detection reference signal SRS.
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