WO2014114113A1 - Dispositif et procédé de traitement dmrs - Google Patents

Dispositif et procédé de traitement dmrs Download PDF

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Publication number
WO2014114113A1
WO2014114113A1 PCT/CN2013/085510 CN2013085510W WO2014114113A1 WO 2014114113 A1 WO2014114113 A1 WO 2014114113A1 CN 2013085510 W CN2013085510 W CN 2013085510W WO 2014114113 A1 WO2014114113 A1 WO 2014114113A1
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Prior art keywords
dmrs
index
resource allocation
sequence
length
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PCT/CN2013/085510
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English (en)
Chinese (zh)
Inventor
罗薇
陈宪明
关艳峰
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中兴通讯股份有限公司
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Publication of WO2014114113A1 publication Critical patent/WO2014114113A1/fr

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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
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation

Definitions

  • the present invention relates to the field of wireless communications, and in particular to an uplink demodulation reference signal (DMRS) processing method.
  • DMRS uplink demodulation reference signal
  • 3G Third Generation
  • 4G fourth generation of mobile communication technology
  • OFDM Orthogonal Frequency Division Multiplexing
  • MIMO Multiple Inputs and Multiple Outputs
  • LTE-Advanced LTE-Advanced
  • LTE-A Advanced Long Term Evolution
  • carrier aggregation carrier aggregation
  • coordinated multi-point transmission and reception relay transmission
  • multi-antenna enhancement Similar to the downlink (Downlink, DL for short), the uplink (Uplink, UL for short) multi-antenna enhancement also includes single-user (Single User, SU) multi-antenna enhancement and multi-user (Multiple User). , referred to as MU) Multi-antenna enhancement.
  • the uplink reference signals in LTE are mostly based on ZC (Zadoflf-Chu) sequences. These sequences satisfy the ideal characteristics of Reference Signal (referred to as RS), Odb Cubic Metric (CM), ideal cycle. Autocorrelation and optimal cross-correlation. A good cross-correlation makes the received signal and the target sequence correlated in time domain, and the average spread of the interference signal in the time domain ensures more reliable detection of the desired channel tap. However, in practice, the CM of a ZC sequence is reduced from the theoretical Odb sampling rate at the Nylonst, due to the presence of unused guard subcarriers at both ends of the sequence and the ZC sequence equivalent in the time domain. Oversampling.
  • the length of the RS sequence is equal to the number of allocated word carriers, which is a multiple of the number of sub-carriers per Resource Block (RB).
  • RB Resource Block
  • the actually used RS sequence is different for the basic RS sequence of the corresponding length. Cyclic shift is obtained.
  • User equipment User Equipment, UE for short
  • UE User Equipment allocated to different subcarriers or RB groups, and RS signals are transmitted on these subcarriers, and thus RS separation is implemented by FDM. However, in some cases, UEs are allocated in the same group. Transmission on subcarriers, such as uplink multi-user MIMO.
  • the RSs have interference with each other, so some methods are needed to separate RSs from different transmitters.
  • Different base sequences used in different UEs transmitted in the same RB are not. Rational As a result, because the non-zero cross-correlation between base sequences can degrade the channel estimation performance of the eNodeB, a more suitable method is to make the RSs of different UEs completely orthogonal.
  • FDM implementation of the RS within the same subcarrier group can be achieved, which then reduces the RS sequence length and the number of different RS sequences available, which is particularly disadvantageous for low bandwidth transmission.
  • the orthogonality between RSs occupying the same subcarrier utilizes a characteristic implementation of the ZC sequence, that is, the correlation between a ZC sequence and any cyclic shift of the same ZC sequence is 0, when the channel impacts
  • different transmitters can use different cyclic shifts of the same RS base sequence, and the RSs can remain orthogonal as long as the cyclic shift is longer than the channel impulse response.
  • the DMRS occupies the same RB position. Therefore, the RB sequence length is equal to the number of subcarriers allocated to the UE for PUSCH or PUCCH transmission.
  • the DMRS transmitted on the PUSCH will adaptively match the allocation of such resources, and according to the total number of allocated RBs, a DMRS base sequence is generated and then decomposed into the RBs of the PUSCH transmission.
  • the DMRS sequence length can only be a multiple of 12.
  • the corresponding DMRS-based sequence is defined as a cyclic extension of the Zadoff-Chu sequence of length MZC, where MZC is the largest prime number less than or equal to the length of the DMRS sequence.
  • the corresponding DMRS base sequence is defined as a special Quadrature Phase Shift Keying (QPSK) sequence obtained by computer search.
  • QPSK Quadrature Phase Shift Keying
  • Each DMRS sequence length corresponds to 30 base sequence sets, and each base sequence set includes one or two base sequences.
  • the DMRS sequence actually used in a certain slot is a cyclic shift of a base sequence in a certain DMRS base sequence group of the corresponding length (corresponding to a linear phase shift in the frequency domain), and each DMRS base sequence can be defined at most. 12 cyclic shifts.
  • the Multiple User-Multiple Inputs and Multiple Outputs (MU-MIMO) transmission is divided into two types, that is, the uplink MU-MIMO transmission with completely overlapping bandwidth. (Different UE bandwidths multiplexed completely overlap) Uplink MU-MIMO transmissions partially overlapping the bandwidth (the multiplexed different UE bandwidths partially overlap).
  • the DMRSs transmitted by different multiplexed UEs in the bandwidth overlapping portion should preferably be orthogonal to each other.
  • the uplink MU-MIMO transmission with completely overlapping bandwidth as shown in FIG. 1, FIG. 2 and FIG. 3, by using the same DMRS motif Different Cyclic Shift (CS) sequences and/or Orthogonal Cover Codes (OCCs) of the columns, different DMRSs from different multiplexed UEs can be mutually orthogonal.
  • CS Cyclic Shift
  • OCCs Orthogonal Cover Codes
  • the uplink MU-MIMO transmission type with partially overlapping bandwidth will become an important and universal transmission mode for the subsequent evolved network.
  • the existing methods of mutually orthogonalizing different DMRSs of different multiplexed UEs that partially overlap bandwidth by using OCC have the following drawbacks: (1) The number of supported maximum multiplexed UEs is two, which limits network capacity. Further improvement; (2) If the coherence time of the channel is greater than the time domain span of the subframe (including two time slots), the method can be used, that is, its application or performance is limited by the UE moving speed or Doppler shift .
  • a DMRS processing method including: receiving, by a UE, first signaling from a base station; and generating, by the UE, a plurality of first DMRS sequences according to the first signaling; The DMRS sequences are combined to generate a second DMRS sequence.
  • the UE in a case that the first signaling includes resource allocation index indication information and virtual cell identity ID information of the UE, the UE according to the resource allocation index indication information and virtual cell ID information of the UE Generating a plurality of first DMRS sequences, and combining the plurality of first DMRS sequences according to the resource allocation index indication information.
  • the UE generates a plurality of first DMRS sequences according to the resource allocation index indication information and the virtual cell ID information of the UE, and combines the multiple first DMRS sequences according to the resource allocation index indication information.
  • the UE generates, according to the resource allocation index indication information and the virtual cell ID information of the UE, N first DMRS sequences of length T resource blocks RB; and according to the resource allocation index indication information combination Deriving a first DMRS sequence of length T RBs to generate a complete second DMRS sequence; wherein, N is a natural number greater than or equal to 1, and the T is a natural number greater than or equal to 1.
  • the generating, by the UE, the N first DMRS sequences of length T T resource blocks RB according to the resource allocation index indication information and the virtual cell ID information of the UE includes: the UE according to the resource allocation The index indication information and the virtual cell ID information of the UE determine a cyclic shift index and a base sequence index of each transport layer of the UE; the UE generates a DMRS base sequence of length T RBs according to the base sequence index; The UE generates N first DMRS sequences of length T RBs according to the DMRS base sequence of T RBs and the cyclic shift index of each transport layer.
  • combining the N first DMRS sequences of length T RBs according to the resource allocation index indication information to generate the complete second DMRS sequence includes: the UE, according to a resource allocation index, the N The first DMRS sequence of T RBs is combined to obtain the complete second DMRS sequence, where the resource allocation index is obtained according to the resource allocation index indication information.
  • the first signaling includes: a transport layer cyclic shift index and a base sequence index of the DMRS
  • the UE generates according to the transport layer cyclic shift index and the base sequence index. a plurality of first DMRS sequences, and combining the plurality of first DMRS sequences.
  • the UE generates a plurality of first DMRS sequences according to the transport layer cyclic shift index and the base sequence index, and combining the plurality of first DMRS sequences includes: the UE according to the base The sequence index generates a DMRS base sequence of length T RBs; the UE generates N lengths of T RBs according to the DMRS base sequence of length T RBs and the cyclic shift index of each transport layer a first DMRS sequence, where the UE combines the N first DMRS sequences of length T RBs according to a resource allocation index, to obtain a complete second DMRS sequence, where the resource allocation index It is obtained according to the resource allocation index indication information sent by the base station.
  • a DMRS processing apparatus including: a receiving module, configured to receive first signaling from a base station; and a generating module, configured to generate a plurality of first DMRSs according to the first signaling a sequence; a combining module, configured to combine the DMRS sequences by the UE to generate a second DMRS sequence.
  • the generating module is further configured to, according to the resource allocation index indication information, the UE, in a case that the first signaling includes resource allocation index indication information and virtual cell identity ID information of the UE
  • the virtual cell ID information generates a plurality of first DMRS sequences
  • the combining module is further configured to: if the first signaling includes resource allocation index indication information, combine the multiple according to the resource allocation index indication information First DMRS sequences.
  • the generating module includes: a first generating unit, configured to generate, according to the resource allocation index indication information and the virtual cell ID information of the UE, N first DMRS sequences of length T resource blocks RB a second generating unit, configured to combine the N first DMRS sequences of length T RBs according to the resource allocation index indication information to generate a complete second DMRS sequence; wherein, the N is greater than or equal to A natural number of 1, the T being a natural number greater than or equal to 1.
  • the generating module is further configured to: when the first signaling includes a transport layer cyclic shift index and a base sequence index of the DMRS, according to the transport layer cyclic shift index and the base a plurality of first DMRS sequences generated by the sequence index; the combining module is further configured to combine the plurality of first DMRS sequences generated according to the transport layer cyclic shift index and the base sequence index.
  • the generating module includes: a third generating unit, configured to generate a DMRS base sequence of length T RBs according to the base sequence index; and a fourth generating unit, configured to be according to the DMRS whose length is T RBs
  • the base sequence and the cyclic shift index of each of the transport layers generate N first DMRS sequences of length T RBs
  • the combining module includes: a combining unit, configured to set the N lengths according to a resource allocation index Combining the first DMRS sequences of the T RBs to obtain the complete second DMRS sequence, where the resource allocation index is obtained according to the resource allocation index indication information sent by the base station.
  • the embodiment of the present invention adopts the following method: the UE receives the first signaling from the base station; the UE generates multiple first DMRS sequences according to the first signaling; and the UE combines the DMRS sequences to generate the first Two DMRS sequences.
  • the problem that the DMRS cannot be orthogonal between different users in the MU-MIMO partial bandwidth overlap situation is solved, and the absolute orthogonality of two or more user DMRSs that allocate the same resource location is supported, and any bandwidth is supported.
  • DMRS orthogonality in partially overlapping scenarios overcomes the scheduling limitations in multi-user MIMO scenarios, thereby improving the transmission performance of the system.
  • FIG. 1 is a schematic diagram of different DMRS orthogonalizations of different multiplexed UEs that achieve full bandwidth overlap by using different CS sequences of a DMRS base sequence according to the related art
  • FIG. 2 is a complete bandwidth using OCC by using a related art.
  • FIG. 5 is a flowchart of a DMRS processing method according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram 1 of a DMRS processing apparatus according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a DMRS processing apparatus according to an embodiment of the present invention
  • FIG. 9 is a schematic structural diagram 3 of a DMRS processing apparatus according to an embodiment of the present invention
  • 10 is a schematic diagram of a DMRS sequence corresponding to two UEs performing MU-MIMO pairing on a scheduled RB according to a preferred embodiment of the present invention
  • FIG. 11 is a scheduling of UE1 and UE2 according to Embodiment 1 of the preferred embodiment of the present invention.
  • FIG. 12 is a DMRS sequence corresponding to UE1 and UE2 on a scheduled RB according to Embodiment 1 of the preferred embodiment of the present invention.
  • Step S506 Step S502: The UE receives the first signaling from the base station.
  • Step S504 The UE generates multiple first DMRS sequences according to the first signaling.
  • Step S506 The UE combines the DMRS sequences to generate a second DMRS sequence.
  • the problem that the DMRS cannot be orthogonal between different users in the MU-MIMO partial bandwidth overlap in the related art can be solved, and the absolute orthogonality of the DMRSs of two or more users allocating the same resource location is supported.
  • the UE may carry a variety of information, such as resource allocation index indication information and a virtual cell identifier (ID) information of the UE. In this case, the UE may generate and generate according to the foregoing information. Second DMRS sequence.
  • the first signaling may further carry a transport layer cyclic shift index and a base sequence index of the DMRS, where the base station that sends the first signaling calculates a transport layer cyclic shift index and a base sequence of the DMRS for the UE.
  • the first signaling includes the resource allocation index indication information and the virtual cell ID information of the UE
  • the UE may generate a plurality of first DMRS sequences according to the resource allocation index indication information and the virtual cell ID information of the UE, and indicate the information according to the resource allocation index. A plurality of first DMRS sequences are combined.
  • the UE generates N first DMRS sequences of length T resource blocks RB according to the resource allocation index indication information and the virtual cell ID information of the UE, and combines N lengths of T RBs according to the resource allocation index indication information.
  • a DMRS sequence is used to generate a complete second DMRS sequence, where N is a natural number greater than or equal to 1, and T is a natural number greater than or equal to 1, wherein the number T of RBs is an optimal choice.
  • the UE determines a cyclic shift index and a base sequence index of each transport layer of the UE according to the resource allocation index indication information and the virtual cell ID information of the UE; after determining the cyclic shift index and the base sequence index, the UE according to the UE
  • the base sequence index generates a DMRS base sequence of length T RBs; and then generates N first DMRS sequences of length T RBs according to a DMRS base sequence of length T RBs and a cyclic shift index of each transport layer.
  • the UE obtains a resource allocation index from the resource allocation index indication information, and then combines N first DMRS sequences of length T RBs according to the resource allocation function to obtain a complete second DMRS sequence.
  • the idea of the foregoing implementation process is to combine the short DMRS sequences into a long DMRS sequence, which avoids the UEs performing coordinated transmission in different cells in the related art and the MU-MIMO paired UEs in the same cell cannot implement absolute orthogonality and existing scheduling.
  • the problem of limited capacity and DMRS multiplexing capacity is insufficient, thereby improving the transmission performance of the system.
  • the UE If the first signaling includes a transport layer cyclic shift index and a base sequence index of the DMRS, the UE generates a plurality of first DMRS sequences according to the transport layer cyclic shift index and the base sequence index, and combines the plurality of first DMRS sequences to A second DMRS sequence is obtained.
  • the UE generates a DMRS base sequence of length T RBs according to the base sequence index, and generates N lengths of T RBs according to the DMRS base sequence of length T RBs and the cyclic shift index of each transport layer.
  • a DMRS sequence N lengths according to the resource allocation index Combining the first DMRS sequences of the T RBs to obtain a complete second DMRS sequence, where the resource allocation index is also obtained according to the resource allocation index indication information sent by the base station.
  • the present embodiment further provides a DMRS processing apparatus, which may implement the foregoing method, and the structure thereof may be as shown in FIG. 6, including: a receiving module 10 configured to receive first signaling from a base station; and a generating module 20, And the receiving module 10 is configured to generate a plurality of first DMRS sequences according to the first signaling.
  • the combining module 30 is coupled to the generating module 20, and is configured to combine the DMRS sequences to generate a second DMRS sequence.
  • different modules may perform different functions according to different information carried by the first signaling, for example, the first signaling includes resource allocation index indication information and a virtual cell identifier ID of the UE.
  • the generating module 20 is further configured to generate a plurality of first DMRS sequences according to the resource allocation index indication information and the virtual cell ID information of the UE.
  • the combining module 30 is further configured to include a resource allocation index indication in the first signaling. In the case of information, a plurality of first DMRS sequences are combined according to the resource allocation index indication information.
  • FIG. 7 is a schematic structural diagram of the generating module 20, including: a first generating unit 202, configured to generate N lengths of T resource blocks RB according to resource allocation index indication information and virtual cell ID information of the UE. a DMRS sequence, the second generating unit 204, coupled to the first generating unit 202, configured to combine N first DMRS sequences of length T RBs according to resource allocation index indication information to generate a complete second DMRS sequence, where N is a natural number greater than 1, and T is a natural number greater than or equal to 1.
  • the generating module 20 may further be configured to generate a plurality of first DMRSs according to the transport layer cyclic shift index and the base sequence index.
  • the combination module 30 may be further configured to combine the plurality of first DMRS sequences generated according to the transport layer cyclic shift index and the base sequence index.
  • the generating module 20 includes: a third generating unit 206, configured to generate a DMRS base sequence of length T RBs according to a base sequence index; a fourth generating unit 208, coupled with the third generating unit 206, configured to generate N first DMRS sequences of length T RBs according to a DMRS base sequence of length T RBs and a cyclic shift index of each transport layer; the combining module 30 includes: The combining unit 302 is configured to combine the first DMRS sequences of length T RBs according to the resource allocation index to obtain a complete second DMRS sequence, where the resource allocation index is based on the resource allocation index indication information sent by the base station owned.
  • the device may further include the mapping module 40 and the sending module 50 shown in FIG. 9 , where the mapping module 40 is coupled to the combining module 30 and configured to set the second DMRS.
  • the sequence is mapped to the RB subcarrier corresponding to the resource allocation index.
  • the sending module 50 is coupled to the mapping module 40, and is configured to send the second DMRS sequence mapped to the RB subcarrier on the PUSCH channel corresponding to the RB subcarrier.
  • the embodiment of the present invention further provides a method for processing a DMRS in a MU-MIMO transmission system, where the base station sends user-specific indication signaling for determining a DMRS for one or more coordinated transmission user terminal UEs that perform MU-MIMO transmission;
  • a RB RS sequence of one RB is synthesized according to the allocated RB index, and a plurality of DMRS sequences of length 1 RB are synthesized, and the synthesized sequence implements group/sequence jump (SGH) and cyclic shift jump with RB granularity.
  • SGH group/sequence jump
  • CSH cyclic shift jump with RB granularity.
  • the method for generating a DMRS sequence includes: the UE generates, according to a predetermined criterion, an M RS base sequence of length 1 RB according to a predetermined criterion, where M indicates the number of RBs allocated by the UE, and the generated base sequence index number Related to the RB position index, the base sequence has an ideal cyclic autocorrelation and an optimal cross-correlation.
  • a method for synthesizing a long DMRS sequence by using a short DMRS sequence includes: performing a corresponding plurality of DMRS base sequences of length T RBs according to the allocated RB index. Synthetic, synthetic sequences are granulated with T RBs.
  • Cyclic shift hopping (CSH) with T RB granularity may include: Cyclic shift hopping (CSH) in the same RB position of different UEs is the same, cyclic shift hopping (CSH) between different RBs of the same UE The way can be different.
  • the preferred value of T is 1.
  • the DRMS generated by the solution supports the absolute orthogonality of two or more user DMRSs located at the same resource location, and supports DMRS orthogonality in an overlapping scenario of any bandwidth, overcomes the limitation of scheduling in a multi-user MIMO scenario, and adjusts the cyclic shift by adjusting
  • the bit interval can be adapted to different multipath delays, is not limited to the user's moving speed, has no loss of user spectrum efficiency, enhances the multiplexing capacity of the DMRS, and avoids UEs that perform cooperative transmission in different cells in the related art and in the same cell.
  • FIG. 10 is a schematic diagram of a DMRS sequence corresponding to two UEs performing MU-MIMO pairing on a scheduled RB according to an embodiment of the present invention, where DMRS of UE1 and UE2 are both It is synthesized by multiple DMRS sequences of length 1 RB.
  • the synthesized sequence implements group/sequence jump (SGH) and cyclic shift jump (CSH) with RB granularity.
  • the specific base sequence and cyclic shift are related to RB position.
  • the method for generating and transmitting the DMRS by the UE1/UE2 may include the following steps 1 to 7.
  • Step 1 The UE receives signaling for the UE to determine the DMRS, where the signaling includes resource allocation index indication information, and UE-specific virtual cell ID information.
  • Step 2 The UE determines a cyclic shift index and a base sequence index of each transport layer according to the virtual cell ID information and the resource allocation index indication information.
  • Step 3 The UE generates a DMRS base sequence of one RB length according to the DMRS base sequence index.
  • Step 4 The UE generates a temporary DMRS sequence with a length of 1 RB per user transport layer according to a DMRS base sequence of one RB and a cyclic shift index of each transport layer.
  • Step 5 returning to step 3, repeating steps 3 to 4 to generate N temporary DMRS sequences of length 1 RB, where N is the number of RBs allocated by the UE.
  • Step 6 The UE synthesizes N temporary DMRS sequences of length 1 RB according to the allocated resource index, and determines a complete DMRS sequence.
  • Step 7 The UE maps the sequence to the corresponding RB subcarrier, and the transmitting module sends the DMRS on the corresponding PUSCH channel.
  • the UE determines the DMRS generation mode according to the received DMRS user-specific signaling.
  • the UE determines the length of the RB according to the user-specific virtual cell ID information.
  • Basic sequences eg, special QPSK-keyed sequences obtained by computer search, and a total of 30 different sequences
  • DMRS sequences from different base sequences have lower but non-zero cross-correlation, but from the same basic
  • the DMRS sequences with different cyclic shifts have perfect orthogonality (no interference with each other), and the UE determines the cyclic shift jump and the group jump manner of each sequence of 1 RB length according to the allocated resource block index.
  • the final determined DMRS sequence assignment is then mapped onto each RB for transmission.
  • the communication system supports the absolute orthogonality of two or more user DMRSs located at the same resource location, supports DMRS orthogonality in an overlapping scenario of any bandwidth, overcomes the limitation of scheduling in a multi-user MIMO scenario, and adjusts the cyclic shift by adjusting The interval can adapt to different multipath delays, and is not limited to the user's moving speed.
  • the multiplexing capacity of the DMRS is enhanced, and the UEs that perform cooperative transmission in different cells in the related art and the MU-MIMO paired UEs in the same cell cannot achieve absolute orthogonality, scheduling constraints, and DMRS multiplexing.
  • the problem of insufficient capacity increases the transmission performance of the system.
  • Embodiment 1 assumes that the base station determines that two terminals performing MU-MIMO paired transmission in the cell are UE1 and UE2, respectively.
  • the base station determines an uplink transmission resource (ie, an RB index) allocated by each UE, and UE1 allocates resources to ⁇ RB1, RB2 ⁇ , and UE2 allocates resources to ⁇ RB1, RB2, RB3 ⁇ .
  • the base station will be used to determine UE1 and UE2
  • UE1 and RRC configure N sets of UE-specific DMRS parameters, which are indicated by uplink dynamic signaling (ULDCI) UE1 UE2
  • UFDCI uplink dynamic signaling
  • Step 1 The UE1 receives the signaling sent by the base station for determining the DMRS by the UE1, where the signaling includes the resource allocation indication information, and the UE1 is proprietary.
  • Virtual cell ID information D S UE1 determines a cyclic shift index of each transport layer according to the virtual cell ID information and the resource allocation index indication information ⁇ RB1, RB2 ⁇ .
  • UFDCI uplink dynamic signaling
  • cell N cell
  • RIV indicates the corresponding RB index.
  • RIV indicates the corresponding RB index.
  • the base station configures the same virtual cell ID information s for UE1 and UE2 performing MU-MIMO pairing. Therefore, the parameters R ⁇ PN ( « S ) indicated by UE1 and UE2 are the same on the same RB. Then, the allocated 2 ⁇ values must be different, so that the two-water UE performing MU-MIMO pairing can use different cyclic shifting steps.
  • the UE1 uses the virtual cell ID information and the resource allocation index indication information ⁇ RB1, RB2.
  • ⁇ Determine the base sequence group index.
  • the calculation method of the base sequence group index in the time slot is as follows: " / ⁇ + y ⁇ modSO , where:
  • the function C (8w s + ) is a pseudo-random variable whose initial value is ] nit
  • the base station configures the same virtual cell S for UE1 and UE2 performing MU-MIMO pairing.
  • Step 4 UE1 determines a DMRS base sequence v of one RB according to the DMRS base sequence group index.
  • Method 1 30 sequences of length 12 are obtained by computer search, and the number is 0 ⁇ 29, according to the value of "determine the corresponding sequence;
  • Step 5 the UE is based on a DM with a length of RB
  • Step 7 UE1 sets two temporary DMRS sequences of length 1 RB according to the allocated resource index.
  • Step 8 UE1 sends DMRS on the corresponding PUSCH channel.
  • the second embodiment of the present embodiment is different from the first embodiment in the third step.
  • « ⁇ is a unique virtual cell ID, which is signaled by the upper layer or indicated by the DCI; / ss mod 30 According to the above method, the base station configures the same virtual cell for UE1 and UE2 performing MU-MIMO pairing.
  • Base sequence group index but the base sequence group indexes owned on different RBs may be the same or different.
  • the third embodiment assumes that the base station determines that the two terminals performing MU-MIMO pairing transmission in the cell are UE1 and UE2, and the base station determines the uplink transmission resource (ie, RB index) allocated by each UE, and the UE1 allocates resources to ⁇ RB1, RB2 ⁇ , UE2.
  • the resource allocation is ⁇ RBI , RB2, RB3 ⁇ , and the base station uses the user-specific signaling for determining the DMRS of UE1 and UE2 to be sent to UE1 and UE2 respectively in the following manner: Mode 1, Dynamic signaling notification: First, configure RRC by RRC
  • the UE-specific DMRS parameter is used by the uplink dynamic signaling (UL DCI) to indicate which set of parameters are specifically used by UE1 and UE2, and the parameters include each user transport layer cyclic shift index and DMRS base sequence group index.
  • UL DCI uplink dynamic signaling
  • the UE-specific DMRS parameters are directly configured and notified by the RRC semi-statically to UE1 and UE2, and the parameters include each user transport layer cyclic shift index and DMRS base sequence group index.
  • the base station determines a cyclic shift index of each user transport layer according to a certain criterion.
  • the criterion includes: UE1 and UE2 have different cyclic shift indexes on the same RB and the same transport layer, and the base sequence group index is the same.
  • the UE1 performing the MU-MIMO pairing transmission performs the following processing steps: Step 1: The UE1 receives the user-specific signaling sent by the base station for determining the DMRS by the UE1, and the signaling includes: a per-user transport layer cyclic shift index ⁇ and a DMRS The base sequence group index ". In this embodiment, it is a transport layer cyclic shift index ⁇ and a DMRS base sequence group index" directly transmitted by the base station.
  • Step 3 UE1 generates a length of RB according to the DMRS base sequence group index ⁇ /1 ( ⁇ /2) DMRS of the base sequence ⁇ v), which is implementing methods may be implemented in a four step embodiment, the steps identical thereto.
  • step four the length of the UE1 according to a DMRS of the base sequence of each RB and transmitting each generated cyclic shift index layer
  • the temporary DMRS sequence r M ( ⁇ ( «) of the transmission layer is 1 RB.
  • Step 5 repeat steps 3 to 4, respectively, to generate N Temporary DMRS sequence of 1 RB in length
  • Step 6 UE1 synthesizes two temporary DMRS sequences ( ⁇ ( «) and r M ( 2 ( «) of length 1 RB according to the allocated resource index, maps to RB1, and maps r a ( «)
  • Step VII UE1 sends a DMRS sequence on the PUSCH channel.
  • Embodiment 4 The base station determines that two terminals performing MU-MIMO pairing transmission in the cell are UE1 and UE2 and UE3, and the UE2 base station determines each The uplink transmission resource allocated by the UE (ie, the RB index), and the UE1 allocates the resource to be ⁇ RB 1, RB2 ⁇ , UE2 allocates resources to ⁇ RB1, RB2, RB3 ⁇ , and the resource allocated by UE3 is ⁇ RB3 ⁇ , and the base station transmits user-specific signaling for determining DMRS of UE1, UE2, and UE3 to UE1 in the following manner, UE2 and UE3: Mode 1, dynamic signaling notification: First, N sets of UE-specific DMRS parameters are configured by RRC, and uplink dynamic signaling (UL DCI) indicates which set of parameters are specifically used by UE1, UE2, and UE3.
  • UL DCI uplink dynamic signaling
  • Manner 2 Semi-static signaling: The RRC semi-static configuration is directly configured and a set of UE-specific DMRS parameters are notified to UE1, UE2, and UE3. As shown in FIG. 12, the UE2 performing the MU-MIMO pairing transmission performs the following processing steps: Step 1: The UE2 receives the signaling sent by the base station for determining the DMRS by the UE2, where the signaling includes the resource allocation index indication information, and the UE2 is virtual. Cell ID information. S
  • Step 2 UE2 according to the virtual cell ID information and the resource allocation index indication information ⁇ RB1, RB2,
  • RB3 ⁇ determines the cyclic shift index of each transport layer.
  • the base station configures the same virtual cell ID information "I R D S for UE1, UE2, and UE3 performing MU-MIMO pairing. Therefore, the parameters indicated by UE1, UE2, and UE3 are " ⁇ Rs and" PN (" S ) are " ⁇ Rs and" PN (" S ) are
  • Step 3 UE2 according to the virtual cell ID information and the resource allocation index indication information ⁇ RB1, RB2, RB3 ⁇ determine the base sequence group index.
  • the specific method of the base sequence group index in the time slot can be seen in step three in the first embodiment.
  • f ss the resource blocks allocated by UE1 are RB1 and RB2
  • / ss mod30, the value of / ss is independent of the allocated RB index, and the values of / ss are the same on RB1 and RB2 and RB3.
  • Step 4 The UE2 generates a DMRS base sequence of the RB, which is a RB, according to the DMRS base sequence group index, UtV (n), and the specific implementation method can be the same as the fourth step of the first embodiment.
  • Step 5 UE2 generates a temporary DMRS sequence r_( «) with a length of 1 RB per transport layer according to a DMRS base sequence of one RB and a cyclic shift index of each transport layer.
  • the specific method may be compared with the embodiment. The same is true in step five.
  • Step 7 UE2 synthesizes two temporary DMRS sequences (n) and ⁇ of length 1 RB according to the allocated resource, and maps to RB1, maps r a ( «) to RB2, and determines completeness.
  • DMRS sequence DMRS sequence.
  • Step VIII UE2 sends a DMRS on the PUSCH channel.
  • the granularity unit generated by the DMRS sequence is one RB, that is, the value of T is the optimal value of 1, but T can also take other values.
  • the value of T is 2. It is assumed that the base station determines that the two terminals performing MU-MIMO paired transmission in the cell are UE1 and UE2, and the base station determines the uplink transmission resource (ie, RB index) allocated by each UE, and the UE1 allocates resources to ⁇ RB1, RB2 ⁇ . The UE2 allocates resources to ⁇ RBI, RB2, RB3, and RB4 ⁇ .
  • the UE1 in step four determines "a DMRS base sequence ⁇ , ⁇ (/7) having a length of two RBs according to the DMRS base sequence group index;
  • the communication system can support the absolute orthogonality of two or more user DMRSs located at the same resource location, and support overlapping of arbitrary bandwidths.
  • the DMRS orthogonality in the scenario overcomes the limitation of scheduling in the multi-user MIMO scenario.
  • the multi-path delay can be adapted by adjusting the cyclic shift interval.
  • the multiplexing capacity avoids the problem that the UEs that perform cooperative transmission in different cells in the related art and the MU-MIMO paired UEs in the same cell cannot achieve absolute orthogonality, there are scheduling restrictions, and the DMRS multiplexing capacity is insufficient, thereby improving the system. Transmission performance.
  • a general-purpose computing device which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the 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 can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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

Abstract

L'invention concerne un dispositif et un procédé de traitement DMRS. Le procédé comprend les étapes suivantes : un UE reçoit un premier signalement d'une station de base; l'UE génère de multiples premières séquences DMRS en fonction du premier signalement; et l'UE combine les séquences DMRS pour générer une seconde séquence DMRS. La présente invention permet de résoudre le problème en l'état de la technique, selon lequel les DMRS entre différents utilisateurs ne sont pas orthogonaux lorsqu'une largeur de bande partielle du MU-MIMO se chevauche, ce qui permet non seulement de supporter l'orthogonalité absolue des DMRS de plus de deux utilisateurs ayant reçu la même position de ressources, mais aussi l'orthogonalité des DMRS lorsqu'une largeur de bande partielle se chevauche et surmonte la restriction de planification dans le scénario de MIMO multi-utilisateur, ce qui améliore les performances de transmission du système.
PCT/CN2013/085510 2013-01-24 2013-10-18 Dispositif et procédé de traitement dmrs WO2014114113A1 (fr)

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