CN102413572B - The sending method and device of DMRS and its signaling - Google Patents
The sending method and device of DMRS and its signaling Download PDFInfo
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- CN102413572B CN102413572B CN201110302150.4A CN201110302150A CN102413572B CN 102413572 B CN102413572 B CN 102413572B CN 201110302150 A CN201110302150 A CN 201110302150A CN 102413572 B CN102413572 B CN 102413572B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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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
- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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Abstract
本发明公开了一种DMRS及其信令的发送方法及装置，其中，DMRS的发送方法包括：UE接收基站发送的用于该UE确定DMRS的用户专有的信令配置信息；该UE使用该用户专有的信令配置信息确定该DMRS；该UE发送该DMRS。通过本发明，提高了接收端对上行CoMP用户的信道估计质量的准确率。
The present invention discloses a DMRS and a signaling method and device thereof, wherein the DMRS sending method includes: UE receiving user-specific signaling configuration information sent by a base station for the UE to determine the DMRS; the UE using the The user-specific signaling configuration information determines the DMRS; the UE sends the DMRS. Through the present invention, the accuracy rate of channel estimation quality of uplink CoMP users at the receiving end is improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a Demodulation reference signal (DMRS) and a method and apparatus for transmitting signaling thereof.
Background
In a Long Term Evolution (LTE) system of The third Generation Partnership Project (3 GPP), a base station centralized scheduling method is used to control transmission of a Physical Uplink Shared Channel (PUSCH) of a User Equipment (UE).
Uplink Scheduling Information (Uplink Scheduling Information) for the PUSCH is sent to the target UE by the base station through a Physical Downlink Control Channel (PDCCH for short). The uplink scheduling information includes: and control information such as resource allocation, modulation and coding scheme, Cyclic Shift (Cyclic Shift) of the DMRS and the like related to the physical uplink shared channel.
In the LTE system, a physical uplink shared channel adopts single antenna port transmission. One system frame (frame) contains 10 subframes (subframes), each containing 2 slots (slots). Fig. 1 is a diagram illustrating a conventional cyclic prefix in a slot according to the related art, and as shown in fig. 1, for a conventional cyclic prefix (normalccp), each slot is composed of 6 data symbols and 1 demodulation reference signal. Fig. 2 is a diagram of an Extended cyclic prefix (Extended CP) in one slot according to the related art, where each slot is composed of 5 data symbols and 1 demodulation reference signal (dm CP).
The demodulation reference signal DM RS is composed of a sequence in the frequency domain, which is a cyclic shift of the reference signal sequence. In order to randomize inter-cell interference, a reference signal Sequence of a demodulation reference signal may implement Sequence hopping (Sequence hopping) or Sequence Group hopping (Group hopping) based on a time slot according to a base station configuration, which is also called an SGH method of time slot hopping. That is, according to the base station configuration, the demodulation reference signals of a ue on two slots in a subframe are different and vary with the slots in a system frame according to a certain hopping pattern.
In time slot nsIn the above embodiments, the cyclic shift amount α of the demodulation reference signal is α ═ 2 π ncsAnd/12, wherein,within a radio frame, ns＝0,1,...,19；Is configured by the parameters of the higher layer,configured by uplink scheduling information. n isPRS(ns) Generated by a pseudo-random generator following a time slot nsThe variable parameter being expressed in particular asThe pseudo-random sequence generator is initialized once in each radio frame under the initial condition thatThe initialization value is related to the associated cell ID and is a cell-specific parameter.
The uplink scheduling Information is carried in a physical downlink control channel, and is sent to the target ue from the base station in a certain downlink control Information format (DCI format). In the LTE system, the formats of downlink control information are divided into the following: DCI format0, 1A, 1B, 1C, 1D, 2A, 3A, and the like, where DCI format0 includes uplink scheduling information for indicating scheduling of a physical uplink shared channel PUSCH.
An LTE-Advanced system (LTE-a system for short) is a next-generation evolution system of the LTE system. In the LTE-a system, the physical uplink shared channel may be transmitted through a single antenna port or through multiple antenna ports. Fig. 3 is a schematic diagram of baseband processing at a transmitting end of a physical uplink shared channel in an LTE-a system using multi-antenna port transmission in the related art, and as shown in fig. 3, during multi-antenna port transmission, the LTE-a system supports spatial multiplexing based on one or two Codewords (CW), where each Codeword corresponds to a Transport Block (TB). Fig. 4 is a diagram illustrating uplink codeword to layer mapping of a related art LTE-a system, where, as shown in fig. 4, codewords are further mapped to layers (layers), and each codeword is mapped to one or two layers of data.
LTE-a adopts a Codebook (Codebook) based linear Precoding technique (Precoding), as shown in fig. 2, the Precoding technique is a technique that utilizes Channel State Information (CSI) to preprocess signals at a transmitting end to improve the performance of a multi-antenna system. One way for the transmitting end to obtain the CSI is through feedback from the receiving end. In order to reduce the feedback overhead, the common approach is to store the same codebook at the receiving end and the transmitting end. The receiving end selects a proper Precoding Matrix in the codebook according to the current channel condition, and feeds back an Index value (Precoding Matrix Index, PMI for short) of the proper Precoding Matrix in the set to the transmitting end, and the transmitting end finds the Precoding Matrix according to the fed-back Precoding Matrix Index and precodes the transmitted signal. The mathematical model of data precoding is that y is HWs + n, where y is the received signal vector, H is the channel coefficient matrix, W is the precoding matrix, s is the signal vector, and n is the noise vector.
In the LTE-A system, when the physical uplink shared channel adopts multi-antenna port transmission, the DMRS of each layer of data is precoded as same as each layer of data. And the demodulation reference signals of different layer data, including the demodulation reference signals of multi-layer data of the same user equipment in a single-user multiple-input multiple-output system (SU-MIMO) and the demodulation reference signals of multi-layer data of a plurality of user equipments in a multi-user multiple-input multiple-output system (MU-MIMO), are orthogonalized by using different demodulation reference signal Cyclic Shifts (CS) and/or Orthogonal masks (OCC) to distinguish different layer data spatially multiplexed by users or different users. Wherein, the orthogonal mask OCC is [ +1, +1] and [ +1, -1 ], and acts on the demodulation reference signals on two slots (slots) within one Subframe (Subframe).
Currently, in the standard Release established by 3GPP, the LTE standard Release is Release 8 (Release 8) and Release 9 (Release 9), the LTE-a standard Release is Release 10 (Release 10), which is abbreviated as Release-8, Release-9 and Release-10, respectively, and the LTE-a standard may also include subsequent releases, such as Release-11. In the current Rel-10 release, the base station may indicate cyclic shift/OCC information of the demodulation reference signal for the scheduled PUSCH through DCIformat0 and DCI format 4, as shown in table 1.
TABLE 1 Cyclic Shift regions of uplink-related DCI FormatAnd [ w(λ)(0) w(λ)(1)]Mapping table
When orthogonalizing the demodulation reference signals using the orthogonal mask OCC, the base station needs to jointly detect the demodulation reference signals on two slots in one subframe, and thus requires that the demodulation reference signals on two slots in one subframe are the same for one ue. In this case, the SGH scheme of slot hopping in the LTE system cannot be used. However, in order to randomize inter-cell interference as much as possible, an SGH scheme for subframe hopping is proposed in the related art. That is, according to the base station configuration, the demodulation reference signals of a ue in two slots in a subframe are the same, the demodulation reference signals in each subframe in a system frame are different, and the demodulation reference signals vary from subframe to subframe in a system frame according to a certain hopping pattern.
The coordinated multi-point transmission technology realizes higher capacity and reliable transmission of a wireless link at the edge of a cell by utilizing the coordinated transmission of transmitting antennas of a plurality of cells, and can effectively solve the problem of cell edge interference. Fig. 5 is a schematic diagram of downlink coordinated multipoint transmission in the related art, and as shown in fig. 5, downlink CoMP can be divided into two types: joint processing/Joint Transmission (JP/JT for short) and coordinated scheduling/Beamforming (CS/CB for short). In JT, data is transmitted simultaneously from multiple cells, and the transmit data, scheduling, and channel state information are only interacted between multiple transmission points in the cooperating set; in CS/CB, only the serving cell sends data to the UE, and scheduling and Beamforming information interact in the CoMP coordination set. Different cells participating in transmission or cooperation form a cooperation set, and for a certain UE, 1 cell in the cooperation set is a serving cell, and the rest cells are cooperation cells.
Fig. 6 is a schematic diagram of uplink coordinated multi-point transmission in the related art, and as shown in fig. 6, a UE1 sends data to a serving cell and a base station or a Remote Radio Head (RRH) of the serving cell, and the cooperating cell and the serving cell perform combined receiving processing on the received data. According to the current uplink DMRS signaling configuration method, the sequence group number of the uplink DMRS is defined by u ═ (f)gh(ns)+fss) mod30, where group-hopping pattern fgh(ns) Sequence-shift pattern (sequence-shift pattern) f determined by cell IDssAnd is divided into two categories, for PUCCH,is defined as:for the PUSCH, the channel estimation is performed,is defined as:△ thereinss∈ {0, 1.,. 29} is configured by high-level RRC signaling, and is a cell specific (cell specific) parameter, when UE1 of cell 1 and cell 2 perform uplink coordinated multipoint transmission and uplink DMRS of UE1 overlaps with UE2 in frequency domain, in order to make uplink DMRS of UE1 and UE2 orthogonal, it is possible to use△ of over-setting cell 1ssThe sequence group numbers of UE1 and UE2 are made the same, but if UE4 of cell 1 and cell 3 also perform uplink coordinated multipoint transmission at this time, since △ssIs a cell-specific parameter, it is no longer possible to set △ for cell 1ssMake UE4 of cell 1 orthogonal to UE3 of cell 3 besides, △ is set for making UE of uplink coordinated multipoint transmission orthogonal to UE of other coordinated cellsssDue to △ssThe DMRS sequence group number of other users in the cell is the same as that of the coordinated cell, so that the multiplexing capacity of the uplink DMRS is reduced. In addition, cyclic shift hopping pattern (cyclic shift pattern) n due to uplink DMRS sequencePRS(ns) Is associated with a time slot nsDue to the changed cell-specific variables, when users between cells use the OCC for orthogonality, since cyclic shift hopping patterns of users in different cells are different, the orthogonality of the OCC is damaged, and the channel estimation quality of the receiving end to the UE1 is affected, so that the transmission performance of uplink CoMP is reduced.
Aiming at the problem that UE among different cells can not realize orthogonality in the related technology, and therefore the channel estimation quality of a receiving end to an uplink CoMP user is poor, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a DMRS and a method and a device for sending signaling thereof, aiming at the problem that UE among different cells in the related art can not realize orthogonality, so that the channel estimation quality of a receiving end to an uplink CoMP user is poor.
According to an aspect of the present invention, there is provided a method for transmitting a DMRS, including: the method comprises the steps that UE receives user-specific signaling configuration information which is sent by a base station and used for determining a DMRS by the UE; the UE determining the DMRS using the user-specific signaling configuration information; the UE transmits the DMRS.
Preferably, the user-specific signaling configuration information comprises at least one of: user-specific sequence group number offsets, user-specific cell Identification (ID) number offsets, user-specific sequence shift pattern offsets.
Preferably, the UE determining the DMRS using the user-specific signaling configuration information comprises: the UE determines initialization conditions of a pseudo-random sequence generator of a sequence group number of the DMRS, the sequence shift pattern, and/or a cyclic shift hopping pattern of the DMRS using the user-specific signaling configuration information.
Preferably, the UE determining the sequence group number of the DMRS includes: the UE determines a sequence group number u of the DMRS using one of the following formulas:
u＝[fgh(ns)+fss+△u]mod 30; or
u＝[fgh(ns)+(fss+△u)mod30]mod30；
Wherein f isgh(ns) Is a group hopping pattern and is determined by a cell identification ID, fssIs a sequence shift pattern, △uAn offset is numbered for the user-specific sequence group, and △u∈{0,1,...,29}。
Preferably, the UE determining an initialization condition of a pseudo-random sequence generator of a cyclic shift hopping pattern of the DMRS includes: the UE determines an initialization condition c of a pseudo-random sequence generator of a cyclic shift hopping pattern of the DMRS using one of the following formulasinit：
Wherein,is a cell ID number, △IDA cell ID number offset specific to the user, and △ID∈{0,1,...,16}；Denotes an integer of from △'ssShift a pattern bias for the user-specific sequence, and △'ss∈{0,1,...,29}，Is the sequence shift pattern of the physical uplink shared channel.
Preferably, the sequence shift pattern is determined by one of the following formulas:
wherein,is a sequence shift pattern of a physical uplink control channel PUCCH,is the sequence shift pattern of the physical uplink shared channel, PUSCH, △ssBiasing for cell-specific sequence shift patterns, △ss∈{0,1,...,29}；△'ssShift pattern bias for the user-specific sequence, △'ss∈{0,1,...,29}，Is a cell ID number that is a unique identifier,a sequence shift pattern bias specific to the user.
Preferably, the DMRS comprises: DMRS of PUSCH or DMRS of PUCCH.
Preferably, the UE receives the user-specific signaling configuration information sent by the base station through DCI signaling or higher layer RRC signaling.
Preferably: the user-specific signaling configuration information includes a parameter having a value of 0 when one of:
the UE does not receive the signaling configuration information specific to the user;
the user-specific signaling configuration information is not activated;
the user specific signaling configuration information is not enabled.
According to another aspect of the present invention, there is provided a method for signaling DMRS, including: a base station determines user-specific signaling configuration information used by UE for configuring DMRS; and the base station sends the signaling configuration information special for the user to the UE.
Preferably, the user-specific signaling configuration information comprises at least one of: user-specific sequence group number offsets, user-specific cell Identification (ID) number offsets, user-specific sequence shift pattern offsets.
Preferably, the DMRS comprises: DMRS of PUSCH or DMRS of PUCCH.
Preferably, the base station sends the signaling configuration information specific to the user to the UE through DCI signaling or higher layer RRC signaling.
Preferably, the user-specific signaling configuration information includes a parameter having a value of 0 when one of the following conditions:
the base station does not send the user-specific signaling configuration information to the UE;
the user-specific signaling configuration information is not activated;
the user specific signaling configuration information is not enabled.
According to another aspect of the present invention, there is provided a transmission apparatus for a DMRS, including: the base station comprises a receiving module and a sending module, wherein the receiving module is used for receiving user-specific signaling configuration information which is sent by the base station and used for the UE to determine a demodulation reference signal (DMRS); a first determining module to determine the DMRS using the user-specific signaling configuration information; a first transmitting module, configured to transmit the DMRS.
According to another aspect of the present invention, there is provided a signaling apparatus for DMRS, comprising: a second determining module, configured to determine user-specific signaling configuration information that is used by the user equipment UE to configure the DMRS; a second sending module, configured to send the user-specific signaling configuration information to the UE.
According to the invention, the UE is adopted to receive the user-specific signaling configuration information which is sent by the base station and used for the UE to determine the DMRS so as to determine the DMRS, so that the DMRS of the UE among different cells are orthogonal, the problem that the UE among different cells in the related technology cannot be orthogonal is avoided, the problem that the channel estimation quality of the receiving end to the uplink CoMP user is poor is solved, the DMRS orthogonality of the UE among different cells is realized, and the accuracy of the channel estimation quality of the receiving end to the uplink CoMP user is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a diagram of a conventional cyclic prefix in one slot of the related art;
fig. 2 is a diagram of an extended cyclic prefix in one slot of the related art;
fig. 3 is a schematic diagram of a transmit end baseband signal processing of a physical uplink shared channel transmitted by a multi-antenna port in a related art LTE-a system;
fig. 4 is a diagram illustrating uplink codeword to layer mapping of a related art LTE-a system;
fig. 5 is a diagram of a downlink coordinated multipoint transmission of the related art;
fig. 6 is a diagram of uplink coordinated multipoint transmission of the related art;
FIG. 7 is a diagram of a related art MU-MIMO transmission;
fig. 8 is a schematic diagram of a related art CoMP scenario 3 or scenario 4;
fig. 9 is a flowchart of a transmission method of a DMRS according to an embodiment of the present invention;
fig. 10 is a flowchart of a signaling method for DMRS according to an embodiment of the present invention;
fig. 11 is a block diagram of a structure of a transmission apparatus for DMRS according to an embodiment of the present invention; and
fig. 12 is a block diagram of a structure of a signaling transmission apparatus for DMRS according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The present embodiment provides a method for transmitting DMRS, and fig. 9 is a flowchart of the method for transmitting DMRS according to an embodiment of the present invention, and as shown in fig. 9, the method includes steps S902 to S906 as follows.
Step S902: the UE receives user-specific signaling configuration information sent by a base station and used for determining a demodulation reference signal (DMRS) by the UE.
Step S904: the UE determines the DMRS using the user-specific signaling configuration information.
Step S906: the UE transmits the DMRS.
Through the steps, the UE receives the user-specific signaling configuration information which is sent by the base station and used for the UE to determine the DMRS, and sends the DMRS, so that the DMRS of the UE among different cells are enabled to be orthogonal, the problem that the UE among different cells in the related technology cannot be orthogonal is avoided, the problem that the channel estimation quality of the receiving end to the uplink CoMP user is poor is solved, the DMRS of the UE among different cells is enabled to be orthogonal, and the accuracy of the channel estimation quality of the receiving end to the uplink CoMP user is improved.
As a preferred embodiment, the user-specific signaling configuration information may include at least one of: user-specific sequence group number offsets, user-specific cell Identification (ID) number offsets, user-specific sequence shift pattern offsets.
As a preferred embodiment, the step S704 may determine the DMRS using the user-specific signaling configuration information in various ways, including: the UE determines initialization conditions of a pseudo-random sequence generator of a sequence group number, a sequence shift pattern, and/or a cyclic shift hopping pattern of the DMRS. That is, the UE may select an initialization condition of the pseudo-random sequence generator that determines the sequence group number of the DMRS, the sequence shift pattern, or the cyclic shift hopping pattern of the DMRS as needed; or a combination of initialization conditions of a pseudo-random sequence generator that determines a sequence group number of the DMRS, a sequence shift pattern, and a cyclic shift hopping pattern of the DMRS.
In implementation, the UE may determine the sequence group number of the DMRS through various embodiments, and preferably, the UE may determine the sequence group number u of the DMRS by using one of the following formulas:
u＝[fgh(ns)+fss+△u]mod 30; or
u＝[fgh(ns)+(fss+△u)mod30]mod30；
Wherein f isgh(ns) Is a group hopping pattern and is determined by a cell identification ID, fssIs a sequence shift pattern, △uSequence group numbering offsets that are user specific, and △u∈ {0, 1.,. 29 }. the configuration provided in the preferred embodiment can configure the same uplink DMRS sequence group number for Mu-MIMO paired users of different cells, or for uplink CoMP users and interfering users of a cooperating cell, thereby achieving orthogonality between users without affecting other users in the cell.
In implementation, the UE may determine an initialization condition of a pseudo-random sequence generator of a cyclic shift hopping pattern of the DMRS through various embodiments. Preferably, the initialization condition c of the pseudo-random sequence generator for determining the cyclic shift hopping pattern of the DMRS may be determined using one of the following formulasinit：
Wherein,is a cell ID number, △IDCell ID number offset specific to the user, and △ID∈{0,1,...,16}；Denotes an integer of from △'ssIs user-specific sequence shift pattern offset, and △'ss∈{0,1,...,29}，Is the sequence shift pattern of the physical uplink shared channel, it should be noted that △ in the above formulaIDIs c for two users that can be used to implement different cellsinitSame cell-ID related parameters, i.e. c for two users as long as different cells can be implementedinitSimilarly, the parameter associated with the cell ID can replace △ in the above equationIDFor determining cinitIn the same way, △ 'in the formula'ssIs c for two users that can be used to implement different cellsinitSame cell-ID related parameters, i.e. c for two users as long as different cells can be implementedinitSimilarly, △ 'in the above formula may be replaced by user specific parameters related to the sequence shift pattern'ssFor determining cinit. The initial value of DMRS configured in this preferred embodiment may make the cyclic shift pattern of the CoMP user consistent with the cyclic shift pattern of the cooperative cell user, thereby ensuring that DMRSs between users are orthogonal.
As another preferred embodiment, the sequence shift pattern of PUSCH or PUCCH can be determined by one of the following formulas:
wherein, △ssBiasing for cell-specific sequence shift patterns, △ss∈{0,1,...,29}；△'ssOffset by user-specific sequence shift pattern, △'ss∈{0,1,...,29}，Is a cell ID number that is a unique identifier,a user-specific sequence shift pattern bias,note that △ 'in the above formula'ssOf two users who can be used to implement different cellsThe same user specific parameters related to the sequence shift pattern, i.e. for two users as long as they can implement different cellsSimilarly, △ 'in the above formula may be replaced by user specific parameters related to the sequence shift pattern'ssFor determiningSimilarly, in the above formulaCan be used for realizing two purposes of different cellsOf a houseThe same user specific parameters related to the sequence shift pattern, i.e. for two users as long as they can implement different cellsThe same user-specific parameters associated with the sequence shift pattern can be substituted for those in the above formulaFor determiningAlternatively, it should be noted that △ 'in the above formula'ssIs available to implement two users in the same cellDifferent parameters, i.e. of as long as two users in the same cell can be achievedInstead, the user-specific parameters associated with the sequence shift pattern may replace △ 'in the above equation'ssFor determiningSimilarly, in the above formulaIs available to implement two users in the same cellDifferent parameters, i.e. of as long as two users in the same cell can be achievedDifferent from and shifted by sequencePattern dependent user specific parameters may be substituted for those in the above formulaFor determiningThe preferred embodiment provides multiple ways of determining the sequence shift pattern so that different ways can be selected as needed to determine the sequence shift pattern, thereby increasing the flexibility of determining the sequence shift pattern.
Preferably, the DMRS includes: DMRS of PUSCH or DMRS of PUCCH.
Preferably, the UE receives the user-specific signaling configuration information sent by the base station through Downlink Control Information (DCI) signaling or higher layer Radio Resource Control (RRC) signaling.
Preferably: the user-specific signaling configuration information includes a parameter having a value of 0 when one of: the UE does not receive the signaling configuration information special for the user; the user-specific signaling configuration information is not activated; user specific signaling configuration information is not enabled.
The present embodiment provides a signaling method for DMRS, and fig. 10 is a flowchart of the signaling method for DMRS according to the embodiment of the present invention, and as shown in fig. 10, the method includes the following steps S1002 to S1004.
Step S1002: a base station determines user-specific signaling configuration information used by UE for configuring DMRS;
step S1004: the base station sends the signaling configuration information specific to the user to the UE.
Through the steps, the base station sends the user-specific signaling configuration information used by the UE for configuring the DMRS to the UE, so that the UE can determine the DMRS according to the user-specific signaling configuration information, the DMRS of the UE among different cells can be orthogonal, and the problem that the channel estimation quality of the receiving end to the uplink CoMP user is poor due to the fact that the UE among different cells cannot be orthogonal in the related technology is solved, the DMRS orthogonality of the UE among different cells is achieved, and the channel estimation quality of the receiving end to the uplink CoMP user is improved.
As a preferred embodiment, the user-specific signaling configuration information may include at least one of: user-specific sequence group number offsets, user-specific cell Identification (ID) number offsets, user-specific sequence shift pattern offsets.
Preferably, the DMRS includes: DMRS of PUSCH or DMRS of PUCCH.
Preferably, the base station transmits the user-specific signaling configuration information to the UE through Downlink Control Information (DCI) signaling or higher layer Radio Resource Control (RRC) signaling.
Preferably, the user-specific signaling configuration information includes a parameter having a value of 0 when one of the following conditions: the base station does not send the signaling configuration information special for the user to the UE; the user-specific signaling configuration information is not activated; user specific signaling configuration information is not enabled.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
In another embodiment, there is further provided software for transmitting a DMRS, where the software is configured to implement the technical solutions described in the foregoing embodiments and the preferred embodiments.
In another embodiment, a storage medium is further provided, where the storage medium stores the transmission software for the DMRS, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The embodiment of the present invention further provides a sending apparatus for DMRS, which can be applied to UE, and the data transmission apparatus can be used to implement the data transmission method and the preferred embodiment, which have been described and are not described again, and the modules involved in the sending apparatus for DMRS are described below. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the systems and methods described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
Fig. 11 is a block diagram of a structure of a transmission apparatus for a DMRS according to an embodiment of the present invention, as shown in fig. 11, the apparatus including: a receiving module 112, a first determining module 114 and a first sending module 116, which are described in detail below.
A receiving module 112, configured to receive user-specific signaling configuration information sent by a base station and used for the UE to determine a demodulation reference signal DMRS; a first determining module 114, connected to the receiving module 112, for determining the DMRS using the user-specific signaling configuration information received by the receiving module 112; and a first transmitting module 116, connected to the first determining module 114, for transmitting the DMRS determined by the first determining module 114.
In another embodiment, there is further provided signaling software for DMRS, where the signaling software is used to implement the technical solutions described in the foregoing embodiments and the preferred embodiments.
In another embodiment, a storage medium is further provided, where the signaling software for DMRS is stored in the storage medium, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The embodiment of the present invention further provides a signaling sending apparatus for DMRS, which can be applied to a base station, and the signaling sending apparatus for DMRS can be used to implement the data transmission method and the preferred embodiment, which have been described and are not described again, and modules involved in the signaling sending apparatus for DMRS are described below. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the systems and methods described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
Fig. 12 is a block diagram of a structure of a signaling apparatus for DMRS according to an embodiment of the present invention, as shown in fig. 10, the apparatus including: the second determining module 122 and the second sending module 124, which are described in detail below.
A second determining module 122, configured to determine user-specific signaling configuration information that is used by the user equipment UE to configure the DMRS;
and a second sending module 124, connected to the second determining module 122, for sending the user-specific signaling configuration information determined by the second determining module 122 to the UE.
Reference will now be made in detail to the preferred embodiments, which are a combination of the above embodiments and preferred embodiments.
Preferred embodiment 1
The preferred embodiment provides a signaling configuration method for an uplink demodulation reference signal, which includes: and the base station transmits signaling configuration information for sending the uplink demodulation reference signal to the user. Preferably, the signaling configuration information includes one or more of the following information: a user specific (UE specific) sequence group number offset, a user specific cell ID number offset, a user specific sequence shift pattern offset.
As a preferred embodiment, the user-specific sequence group number offset is used to determine the sequence group number of the uplink DMRS: u ═ fgh(ns)+fss+△u]mod30, or u ═ fgh(ns)+(fss+△u)mod30]mod30, where △uI.e., user-specific sequence group number offsets, △u∈{0,1,...,29}。
As another preferred embodiment, use is made ofUser-specific cell ID number offset and user-specific sequence shift pattern offset for determining a cyclic shift hopping pattern nPRS(ns) The initialization condition of the pseudo-random sequence generator of (1):
the first method is as follows:wherein, △IDI.e. cell ID number offset specific to the user, △ID∈{0,1,...,16}；Denotes an integer of from △'ssI.e., user-specific sequence shift pattern bias, △'ss∈{0,1,...,29}。
The second method comprises the following steps:wherein, △IDI.e. cell ID number offset specific to the user, △ID∈{0,1,...,16}。
Preferably, it can be determined by one of the following ways
The first method is as follows: is determined by the following formula△'ssI.e., user-specific sequence shift pattern bias, △ss∈{0,1,...,29}；
The second method comprises the following steps: is determined by the following formula△ssBiasing for cell-specific sequence shift patterns, △ss∈{0,1,...,29}，△'ssI.e., user-specific sequence shift pattern bias, △'ss∈{0,1,...,29}。
Wherein the determination can be made by the following formulaOrWhereinA user-specific sequence shift pattern offset.
Preferably, the uplink demodulation reference signal includes: a demodulation reference signal of PUSCH and a demodulation reference signal of PUCCH.
As a preferred embodiment, the base station issues signaling configuration information for sending the uplink demodulation reference signal to the user through DCI signaling or higher layer RRC signaling.
Preferably, when the base station does not have signaling configuration information issued to the user, or the signaling configuration information is not activated or enabled (not active or active-signaling configuration information is not set), or the user does not receive the signaling configuration information, the signaling configuration information defaults to 0, that is △uAnd/or △IDAnd/or △'ssAnd/orAnd/or △ssIs 0.
By the preferred embodiment, the base station issues the user-specific signaling configuration information for sending the uplink demodulation reference signal to the user, so that the uplink DMRS of different users in a cell can be orthogonalized without affecting other users in the cell, the cell users in the same cell ID can use different uplink DMRS sequence group numbers, the problems that the UE in different cells in the related technology cannot be orthogonalized and the channel estimation quality of the receiving end to the uplink CoMP user is low in the related technology can be solved, and the problems that the channel estimation quality of the receiving end to the uplink CoMP user is low and the uplink DMRS multiplexing capacity is limited in the related technology can be solved, so that the multiplexing capacity of the uplink DMRS is improved, and the system performance is optimized.
Preferred embodiment two
The embodiment provides a signaling configuration method of an uplink demodulation reference signal, which includes: and the base station transmits signaling configuration information for sending the uplink demodulation reference signal to the user. Wherein the signaling configuration information includes one or more of the following information: user-specific cell ID number offset, user-specific sequence shift pattern offset.
The preferred embodiment takes the schematic diagram of uplink coordinated multi-point transmission in fig. 5 as an example, and assumes the cell ID number of cell 10, the cell ID number of the cell 2 is 30, and the uplink coordinated multipoint transmission cells of the UE1 are the cell 1 and the cell 2. If the time-frequency positions of the UE1 and the UE2 overlap, in order to reduce mutual interference, it is necessary to make uplink DMRS sequences of the UE1 and the UE2 orthogonal by means of cyclic shift or OCC multiplexing.
According to the 3GPP Rel-10 signaling configuration mechanism in the related art, the cyclic shift amount α of the uplink demodulation reference signal is α ═ 2 π ncsAnd/12, wherein,within a radio frame, ns＝0,1,...,19；Is configured by the parameters of the higher layer,configured by uplink scheduling information. n isPRS(ns) Generated by a pseudo-random generator following a time slot nsThe variable parameter being expressed in particular asThe pseudo-random sequence generator is initialized once in each radio frame under the initial condition thatWherein △ssBiasing for cell-specific sequence shift patterns, △ss∈ {0, 1.., 29 }. assume △ for cell 1ssTaking 0, the cyclic shift hopping pattern n for UE1 and UE2 may be calculatedPRS(ns) The initial values of the pseudo-random sequence generator of (1) are 0 and 2, respectively5And the initial values are not equal, the orthogonality of the uplink DMRS sequences of UE1 and UE2 cannot be strictly guaranteed, and in addition, △ of cell 1 or cell 2 cannot be guaranteedssTaking any value, the cyclic shift hopping pattern n of UE1 and UE2 cannot be madePRS(ns) The initial values of the pseudo-random sequence generators of (2) are equal, so that the orthogonality of the uplink DMRS sequences of the UE1 and the UE2 cannot be guaranteed. Through the above description, it can be seen that the configuration method in the related art cannot implement DMRS orthogonality of the UE.
The signaling configuration method of the preferred embodiment is described in detail below. In the preferred embodiment, the base station issues a user-specific cell ID number offset and/or a user-specific sequence shift pattern offset for sending the uplink demodulation reference signal to the user for determining the cyclic shift hopping pattern nPRS(ns) The initialization condition of the pseudo-random sequence generator.
The initialization conditions of the pseudo-random sequence generator may be determined in one of the following ways in the preferred embodiment.
The first method is as follows:wherein, △IDI.e. cell ID number offset specific to the user, △ID∈{0,1,...,16}；△'ssI.e., user-specific sequence shift pattern bias, △'ss∈{0,1,...,29}。
The second method comprises the following steps:wherein, △IDI.e. cell ID number offset specific to the user, △ID∈{0,1,...,16}；
By the method of the preferred embodiment, the adjustment of the cyclic shift hopping pattern n of the uplink CoMP user can be realizedPRS(ns) Cyclic shift hopping pattern n with cooperative cell usersPRS(ns) The coordination cell user and the uplink CoMP user are overlapped in time-frequency position, or the cyclic shift hopping pattern n of the MU-MIMO paired users between the cells is adjustedPRS(ns) And the orthogonality among users cannot be damaged due to the inconsistency of the cyclic shift hopping patterns, so that the mutual orthogonality among the users is ensured.
Preferred embodiment three
The embodiment provides a signaling configuration method of an uplink demodulation reference signal, which includes: and the base station transmits signaling configuration information for sending the uplink demodulation reference signal to the user. Wherein the signaling configuration information comprises one or more of the following information: a user specific (UE specific) sequence group number offset, a user specific sequence shift pattern offset.
In the preferred embodiment, the user determines the sequence group number of the uplink DMRS by using a user-specific sequence group number offset and/or a user-specific sequence shift pattern offset in one of the following manners.
The first method is as follows: u ═ fgh(ns)+fss+△u]mod30, or u ═ fgh(ns)+(fss+△u)mod30]mod30, where △uI.e. a sequence group specific to the userNumber offset, △u∈{0,1,...,29}。
The second method comprises the following steps: u ═ fgh(ns)+fss]mod30。
Preferably, for PUCCH, the determination may be made in one of the following ways
The first method is as follows:
the second method comprises the following steps:whereinA user-specific sequence shift pattern offset.
Preferably, for PUSCH, one of the following ways may be used
The first method is as follows:△'ssi.e., a user-specific sequence shift pattern offset.
The second method comprises the following steps:△ssbiasing for cell-specific sequence shift patterns, △ss∈{0,1,...,29}，△'ssOffset by user-specific sequence shift pattern, △'ss∈{0,1,...,29}。
By the signaling configuration method of the preferred embodiment, the base station may configure the same uplink DMRS sequence group number for MU-MIMO paired users in different cells (different cell IDs), or for uplink CoMP users (e.g., CoMP scene 3) and interfering users in a cooperating cell, so as to implement orthogonality between users and not affect other users in the cell.
Taking the transmission scheme in the schematic diagram of MU-MIMO transmission in FIG. 6 as an example, assume the cell ID number of cell 10, cell ID number 2 for cell 2, UE1 and UE2 are users of MU-MIMO pairing of cell 2 base stations, sequence group hopping for UE1 and UE2 is not enabledu2 and 0 respectively, so that the uplink DMRS sequence group numbers of UE1 and UE2 are both 2, so that the uplink DMRSs of UE1 and UE2 can be orthogonal through CS and/or OCC, while not affecting other users of cell 1. If the user-specific sequence shift pattern offsets of UE1 and UE2 are set by way of the second preferred embodimentOr user-specific sequence shift pattern bias △'ss/△ssThe uplink DMRSs of the UE1 and the UE2 may be finally orthogonal.
Preferred embodiment four
The embodiment provides a method for configuring DMRS, which includes that a base station can configure different uplink DMRS sequence group numbers for users (such as CoMP scene 4) with the same cell ID, so that the purpose of increasing uplink DMRS multiplexing capacity is achieved.
Taking CoMP scenario 3 or CoMP scenario 4 shown in fig. 7 as an example, if the cell IDs of the macro base station and the low power node below the macro base station are the same, CoMP scenario 4 is obtained, and if the cell IDs are not the same, CoMP scenario 3 is obtained. Taking CoMP scenario 4 as an example, according to the configuration method of the 3GPP Rel-10 protocol in the related art, the numbers of the uplink DMRS sequence groups of users belonging to the macro base station are the same, and the numbers of the uplink DMRS sequence groups of users belonging to the low power node are the same, but the number of users in CoMP scenario 4 is generally large, and the problem of DMRS resource collision due to insufficient multiplexing capacity is likely to occur. By the method and the device, the base station can configure different uplink DMRS sequence group numbers for users (such as CoMP scene 4) with the same cell ID, so that the multiplexing capacity of the DMRS is increased.
Through the embodiment, the DMRS and the signaling sending method and device thereof are provided, the DMRS is determined by the UE receiving the signaling configuration information which is sent by the base station and is used by the UE for determining the DMRS, so that the DMRS of the UE among different cells are orthogonal, and the problem that the channel estimation quality of the receiving end to the uplink CoMP user is poor due to the fact that the UE among different cells cannot be orthogonal in the related technology is solved, thereby realizing the DMRS orthogonality of the UE among different cells and improving the accuracy of the channel estimation quality of the receiving end to the uplink CoMP user. It should be noted that these technical effects are not possessed by all the embodiments described above, and some technical effects are obtained only by some preferred embodiments.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or they may be separately fabricated into various integrated circuit modules, or multiple modules or steps thereof may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A method for transmitting a demodulation reference signal (DMRS), the method comprising:
user Equipment (UE) receives user-specific signaling configuration information which is sent by a base station and used for determining a DMRS by the UE;
the UE determining the DMRS using the user-specific signaling configuration information, wherein the UE determining the DMRS using the user-specific signaling configuration information comprises: the UE determining initialization conditions of a pseudo-random sequence generator of a sequence group number of the DMRS, the sequence shift pattern, and/or a cyclic shift hopping pattern of the DMRS using the user-specific signaling configuration information;
the UE transmits the DMRS.
2. The method of claim 1, wherein the user-specific signaling configuration information comprises at least one of: user-specific sequence group number offsets, user-specific cell Identification (ID) number offsets, user-specific sequence shift pattern offsets.
3. The method of claim 1, wherein the UE determining the sequence group number for the DMRS comprises:
the UE determines a sequence group number u of the DMRS using one of the following formulas:
u＝[fgh(ns)+fss+△u]mod30；
u＝[fgh(ns)+(fss+△u)mod30]mod30；
wherein f isgh(ns) Is a group hopping pattern and is determined by a cell identification ID, fssIs a sequence shift pattern, △uAn offset is numbered for the user-specific sequence group, and △u∈{0,1,...,29}。
4. The method of claim 1, wherein the UE determining initialization conditions for a pseudo-random sequence generator of a cyclic shift hopping pattern for the DMRS comprises:
the UE determines an initialization condition c of a pseudo-random sequence generator of a cyclic shift hopping pattern of the DMRS using one of the following formulasinit：
Wherein,is a cell ID number, △IDA cell ID number offset specific to the user, and △ID∈{0,1,...,16}；Denotes an integer of from △'ssShift a pattern bias for the user-specific sequence, and △'ss∈{0,1,...,29}，Is the sequence shift pattern of the physical uplink shared channel.
5. The method of any one of claims 1, 3, or 4, wherein the sequence shift pattern is determined by one of the following equations:
wherein,is a sequence shift pattern of a physical uplink control channel PUCCH,is the sequence shift pattern of the physical uplink shared channel, PUSCH, △ssBiasing for cell-specific sequence shift patterns, △ss∈{0,1,...,29}；△'ssShift pattern bias for the user-specific sequence, △'ss∈{0,1,...,29}，Is a cell ID number that is a unique identifier,a sequence shift pattern bias specific to the user.
6. The method according to any one of claims 1 to 4, wherein the DMRS comprises: DMRS of PUSCH or DMRS of PUCCH.
7. The method according to any of claims 1 to 4, wherein the UE receives the user-specific signaling configuration information sent by the base station through Downlink Control Information (DCI) signaling or higher layer Radio Resource Control (RRC) signaling.
8. The method according to any of claims 1 to 4, wherein the user specific signalling configuration information comprises a parameter with a value of 0, when one of:
the UE does not receive the signaling configuration information specific to the user;
the user-specific signaling configuration information is not activated;
the user specific signaling configuration information is not enabled.
9. A signaling method for demodulation reference signals (DMRS), comprising:
a base station determines user-specific signaling configuration information used by a User Equipment (UE) to configure a DMRS, wherein the UE configures the DMRS using the user-specific signaling configuration information by: the UE determining initialization conditions of a pseudo-random sequence generator of a sequence group number of the DMRS, the sequence shift pattern, and/or a cyclic shift hopping pattern of the DMRS using the user-specific signaling configuration information;
and the base station sends the signaling configuration information special for the user to the UE.
10. The method of claim 9, wherein the user-specific signaling configuration information comprises at least one of: user-specific sequence group number offsets, user-specific cell Identification (ID) number offsets, user-specific sequence shift pattern offsets.
11. The method of claim 9 or 10, wherein the DMRS comprises: DMRS of PUSCH or DMRS of PUCCH.
12. The method according to claim 9 or 10, wherein the base station sends the user-specific signaling configuration information to the UE through downlink control information, DCI, signaling or higher layer radio resource control, RRC, signaling.
13. The method according to claim 9 or 10, wherein the user specific signaling configuration information comprises a parameter with a value of 0, when one of:
the base station does not send the user-specific signaling configuration information to the UE;
the user-specific signaling configuration information is not activated;
the user specific signaling configuration information is not enabled.
14. A transmitting device of a demodulation reference signal (DMRS) is applied to User Equipment (UE), and is characterized by comprising the following components:
the base station comprises a receiving module and a sending module, wherein the receiving module is used for receiving user-specific signaling configuration information which is sent by the base station and used for the UE to determine the DMRS;
a first determining module to determine the DMRS using the user-specific signaling configuration information, wherein the UE determining the DMRS using the user-specific signaling configuration information comprises: the UE determining initialization conditions of a pseudo-random sequence generator of a sequence group number of the DMRS, the sequence shift pattern, and/or a cyclic shift hopping pattern of the DMRS using the user-specific signaling configuration information;
a first transmitting module, configured to transmit the DMRS.
15. A signaling transmission device for a demodulation reference signal (DMRS) is applied to a base station, and is characterized by comprising the following components:
a second determining module, configured to determine user-specific signaling configuration information used by a User Equipment (UE) to configure the DMRS, wherein the UE configures the DMRS using the user-specific signaling configuration information by: the UE determining initialization conditions of a pseudo-random sequence generator of a sequence group number of the DMRS, the sequence shift pattern, and/or a cyclic shift hopping pattern of the DMRS using the user-specific signaling configuration information; a second sending module, configured to send the user-specific signaling configuration information to the UE.
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