WO2013113286A1 - 解调导频信号处理方法、基站及用户设备 - Google Patents

解调导频信号处理方法、基站及用户设备 Download PDF

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Publication number
WO2013113286A1
WO2013113286A1 PCT/CN2013/071266 CN2013071266W WO2013113286A1 WO 2013113286 A1 WO2013113286 A1 WO 2013113286A1 CN 2013071266 W CN2013071266 W CN 2013071266W WO 2013113286 A1 WO2013113286 A1 WO 2013113286A1
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Prior art keywords
dmrs
pdcch
initial value
base station
pseudo
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PCT/CN2013/071266
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English (en)
French (fr)
Inventor
刘鹍鹏
刘江华
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华为技术有限公司
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Priority to EP13744252.1A priority Critical patent/EP2804355B1/en
Priority to RU2014135416/07A priority patent/RU2589733C2/ru
Priority to EP17166013.7A priority patent/EP3264664B1/en
Priority to IN1656KON2014 priority patent/IN2014KN01656A/en
Publication of WO2013113286A1 publication Critical patent/WO2013113286A1/zh
Priority to US14/448,187 priority patent/US10158471B2/en
Priority to US16/175,431 priority patent/US20190074949A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/261Details of reference signals
    • H04L27/2613Structure of the reference signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the downlink control channel region occupies the first N orthogonal frequency division multiplexing (OFDM) symbols, and N is less than or equal to 3; the downlink data channel region occupies the remaining OFDM symbols.
  • Physical Downlink Control Channel (PDCCH) is used to transmit scheduling indication signaling for user uplink or downlink data transmission, such as resource channel resource allocation, modulation and coding mode, multi-antenna transmission, and hybrid automatic repeat request (Hybrid Automatic). Repeat Request, HARQ) Process related information, etc.
  • the PDCCH of multiple users shares the time-frequency resources of the downlink control channel region.
  • the Physical Downlink Shared Channel (PDSCH) is used to transmit user downlink data and occupy time-frequency resources of the downlink data channel region.
  • the capacity of the downlink control channel region is a key factor affecting the number of users that the cell can simultaneously schedule.
  • CoMP Coordinated Multiple Points
  • MU-MIMO Multiple User Multiple-Input Multiple-Output
  • the downlink control channel region of the three OFDM symbols in the LTE system cannot meet the requirement, and an Extended Physical Downlink Control Channel (E-PDCCH) is generated, so as to transmit a scheduling indication of uplink or downlink data transmission of more users.
  • E-PDCCH Extended Physical Downlink Control Channel
  • the E-PDCCH occupies a part of the time-frequency resource in the downlink data channel region, and shares the downlink with the PDSCH through a combination of Frequency-Division Multiplexing (FDM) or Time Division Multiplex (TDM) and frequency division multiplexing. Time-frequency resources of the data channel area.
  • the E-PDCCH is demodulated based on a Demodulation Reference Signal (DMRS), and the DMRS is User Equipment (UE) specific.
  • DMRS is jointly determined based on the cell ID (Cell ID) and the scrambling code sequence identifier (SCID).
  • the SCID is notified to the UE together with the E-PDCCH, so that the UE cannot know the SCID in advance, and the DMRS required for demodulating the E-PDCCH cannot be obtained, and the E-PDCCH cannot be demodulated.
  • the present invention provides a method for processing a demodulation pilot signal, a base station, and a user equipment, which are used to provide a DMRS required for demodulating an E-PDCCH, and implement successful demodulation of the E-PDCCH.
  • An aspect of the present invention provides a method for processing a demodulated pilot signal, including:
  • the eNB generates a DMRS corresponding to the E-PDCCH according to information that the user equipment UE can obtain before receiving the extended physical downlink control channel E-PDCCH sent by the base station;
  • An aspect of the present invention provides a base station, including:
  • a first generation module configured to generate, according to information that the user equipment UE can obtain before the extended physical downlink control channel E-PDCCH sent by the base station, the DMRS corresponding to the E-PDCCH;
  • a sending module configured to: map the DMRS generated by the first generating module to a time-frequency resource of a transmission pilot corresponding to a downlink control channel region, and send the DMRS to the UE.
  • Another aspect of the present invention provides a method for processing a demodulated pilot signal, including:
  • the user equipment UE generates the DMRS corresponding to the E-PDCCH by using information that can be learned before receiving the extended physical downlink control channel E-PDCCH sent by the base station;
  • the UE detects the E-PDCCH according to the DMRS.
  • Another aspect of the present invention provides a user equipment, including:
  • a third generation module configured to generate, by using information that can be learned before receiving the extended physical downlink control channel E-PDCCH sent by the base station, to generate a DMRS corresponding to the E-PDCCH;
  • a detecting module configured to detect the E-PDCCH according to the DMRS generated by the third generating module.
  • the base station generates a DMRS required for demodulating an E-PDCCH according to information that the UE can obtain before receiving the E-PDCCH transmitted by the base station, and then sends the DMRS to the UE.
  • the UE can generate the DMRS by using the corresponding information before receiving the E-PDCCH, and then according to the The resulting DMRS completes demodulation of the E-PDCCH.
  • the problem that the UE cannot obtain the DMRS before the E-PDCCH is received cannot obtain the DMRS and the E-PDCCH cannot be demodulated is solved, and the solution of the E-PDCCH is solved. Tune the question.
  • a method for processing a demodulation pilot signal and a user equipment provided by another aspect of the present invention, the UE and the base station cooperate to generate a required demodulation E-PDCCH by using information that can be learned before receiving the E-PDCCH transmitted by the base station.
  • the DMRS then performs demodulation of the E-PDCCH based on the generated DMRS. Since the information used by the base station and the UE to generate the DMRS is no longer the SCID, the problem that the UE cannot obtain the DMRS before acquiring the E-PDCCH and cannot generate the DMRS, and thus the E-PDCCH cannot be demodulated is solved, and the solution of the E-PDCCH is solved. Tune the question.
  • FIG. 1 is a flowchart of a DMRS processing method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a DMRS processing method according to another embodiment of the present invention.
  • FIG. 3A is a schematic structural diagram of an implementation of a PDCCH for forming CCEs of different users according to an embodiment of the present disclosure
  • FIG. 3B is a schematic diagram of an E-CCE carrying an E-PDCCH in a control unit group according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a DMRS processing method according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a DMRS processing method according to another embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to another embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a UE according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a UE according to another embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the following will be incorporated in the embodiments of the present invention.
  • the drawings illustrate the technical solutions in the embodiments of the present invention clearly and completely. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • FIG. 1 is a flowchart of a DMRS processing method according to an embodiment of the present invention. As shown in FIG. 1, the method in this embodiment includes:
  • Step 101 The base station generates a DMRS corresponding to the E-PDCCH according to information that the UE can obtain before receiving the E-PDCCH sent by the base station.
  • the base station in this embodiment does not use the SCID to generate the E-PDCCH, but uses the UE to receive.
  • the information that can be obtained before the E-PDCCH such as the cell ID or the Radio Network Temporary Identifier (RNTI), generates a DMRS required for demodulating the E-PDCCH.
  • the information may be any information that the UE can learn before receiving the E-PDCCH.
  • the DMRS in this embodiment refers to a DMRS required by the base station to demodulate the E-PDCCH.
  • Step 102 The base station maps the DMRS to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region and sends the DMRS to the UE.
  • the base station generates the DMRS only when there is an E-PDCCH to be transmitted. After the DMRS is generated by the base station, the DMRS is mapped to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region and sent to the UE. In this embodiment, the base station also maps the E-PDCCH to a time-frequency resource for transmitting pilots in a downlink data channel region by frequency division multiplexing or a combination of time division multiplexing and frequency division multiplexing.
  • the downlink control channel region in this embodiment refers to a downlink control channel region in the prior art, that is, a time-frequency resource that is mainly used to carry a PDCCH of a user.
  • the downlink data channel region in this embodiment is The downlink data channel area in the prior art, that is, the time-frequency resource originally used to carry the PDSCH of the user.
  • the base station does not use the SCID to generate the DMRS required for demodulating the E-PDCCH, but uses the information that the UE can obtain before receiving the E-PDCCH to generate the DMRS. Accordingly, the UE is also based on receiving the DMRS.
  • the information that can be learned by the E-PDCCH is generated before the E-PDCCH is received, so that the demodulation of the E-PDCCH is completed based on the generated DMRS, which overcomes the defect that the UE cannot generate the DMRS based on the SCID as in the prior art, and solves the problem. Demodulation problem of E-PDCCH.
  • FIG. 2 is a flowchart of a DMRS processing method according to another embodiment of the present invention.
  • the method in this embodiment includes: Step 201: The base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to the cell ID and/or the RNTI of the cell where the UE is located.
  • Step 202 The base station generates a DMRS according to an initial value of the pseudo random sequence.
  • the base station generates the DMRS required for demodulating the E-PDCCH by using the information that the UE can learn before receiving the E-PDCCH as the cell ID and/or the RNTI, but the information used is not limited thereto.
  • the RNTI may be a cell radio network temporary identifier (Cell RNTI, C-RNTI), a system information radio network temporary identifier (System Information RNTI, SI-RNTI), a paging radio network temporary identifier (Paging RNTI, P-RNTI), or Random Access RNTI (Radio Access RNTI, RA-RNTI), Transmit Power Control-Physical Uplink Control Channel-RNTI (TPC-PUCCH-RNTI) Transmit Power Control Physics
  • the uplink shared channel radio network temporary identifier Transmit Power Control-Physical Uplink Shared Channel-RNTI, TPC-PUSCH-RNTI
  • the base station generates a first DMRS according to formula (1).
  • r(m) - ⁇ (1-2 ⁇ c(2w)+j (l -2 ⁇ c(2m + 1))
  • the base station If ⁇ is the number of resource blocks included in the bandwidth occupied by the pilot corresponding to the E-PDCCH, the base station generates a DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, that is, the base station generates a length.
  • the base station generates an initial value of the pseudo-random sequence c according to the cell ID and/or the RNTI of the cell in which the UE is located.
  • the base station may generate an initial value of the pseudo-random sequence c corresponding to the DMRS according to formula (2).
  • t L "s / 2" 29 + (2) wherein an initial value corresponding to the DMRS of the pseudo-random sequence c; "s of the corresponding DMRS transmission slot number, i.e., the transmission time slot number of the DMRS; Vro is the cell ID of the cell where the UE is located.
  • the base station may further generate an initial value of the pseudo-random sequence c corresponding to the DMRS according to the formula (3).
  • c imt (L" s /2" + l) ' (2A ⁇ + l) .2 9 + ⁇ ( 3 )
  • the base station only the ID of the cell where the UE is located is included, that is, the base station only The pseudo-random sequence c is scrambled with the cell ID to generate an initial value of the pseudo-random sequence c.
  • the base station may further generate an initial value of the pseudo-random sequence c corresponding to the DMRS according to formula (4).
  • c imt (L"s/ 2 " + l) '( 2 ⁇ +l)' 2 16 +"
  • both the cell ID and the RNTI are included, and the base station scrambles the pseudo-random sequence using the RNTI to generate a pseudo The initial value of the random sequence c.
  • L" S /2" represents rounding down the quotient obtained by dividing the slot number by 2.
  • the base station After the base station generates an initial value of the pseudo-random sequence c corresponding to the DMRS according to formula (2) or (3) or (4), the base station generates a DMRS according to formula (1).
  • the base station can also generate an initial value of the pseudo-random sequence using the variant formula of equation (2) or (3) or (4).
  • the base station can also generate an initial value of the pseudo-random sequence using only the RNTI.
  • Step 203 The base station maps the DMRS to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region and sends the DMRS to the UE.
  • the base station If the base station generates the DMRS according to the maximum system bandwidth, the base station intercepts the corresponding sequence from the DMRS to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region according to the resource location of the DMRS, and sends the DMRS to the UE.
  • the base station If the base station generates the DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, the base station directly maps the generated DMRS to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region and sends the DMRS to the UE.
  • the base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to the cell ID and/or the RNTI of the cell where the UE is located, and further generates a DMRS according to the initial value of the pseudo-random sequence, the used cell ID and/or
  • the RNTI is the information that the UE can learn before receiving the E-PDCCH. Therefore, the UE can generate the DMRS before receiving the E-PDCCH by using the same generation manner as the base station, and lay a foundation for successfully demodulating the E-PDCCH by using the generated DMRS.
  • the problem that the UE cannot generate the DMRS according to the SCID and cannot demodulate the E-PDCCH is solved in the prior art.
  • the first embodiment in which the base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to formula (2) or (3) or (4) is related to the aggregation level of the E-PDCCH.
  • the Long Term Evolution (LTE) system defines a Control Channel Element (CCE) as a PDCCH resource component, and each CCE is mapped to a specific time-frequency grid point in the downlink control channel region, that is, a resource element. (Resource Element, RE).
  • CCE Control Channel Element
  • the PDCCH may be composed of 1, 2, 4, and 8 CCEs, which respectively correspond to different coding rate, that is, the PDCCH has four aggregation levels, and each aggregation level includes CCEs of 1, 2, 3, and 4.
  • An implementation structure of a CPDCCH composed of different users is shown in FIG. 3A.
  • CCE0-CCE3 constitutes the PDCCH of UE1;
  • CCE4-CCE5 constitutes the PDCCH of UE2;
  • CCE6-CCE7 constitutes the PDCCH of UE3;
  • CCE8, CCE9, and CCE10 form the PDCCH of UE4, UE5 and UE6, respectively.
  • the PDCCH of the user is composed of several CCEs and is determined by the base station according to the channel condition of the user, and is notified to the UE after the base station determines.
  • the LTE system Similar to the PDCCH, the LTE system also defines an extended control channel unit for the E-PDCCH (Extended
  • E-CCE Control Channel Element
  • E-PDCCH can also allocate resources in units of E-CCE.
  • Each E-CCE is mapped at a specific time-frequency grid point within the downlink data channel region carrying the E-PDCCH.
  • the aggregation level of multiple E-PDCCHs is defined according to the number of E-CCEs constituting the E-PDCCH. For example, the aggregation level of the E-PDCCH is k, and the number of E-CCEs respectively included are M1, M2, ..., Mk.
  • the base station determines the time-frequency resource used for transmitting the E-PDCCH, and determines the aggregation level of the E-PDCCH or the aggregation level of the UE that receives the E-PDCCH. For example, if the base station determines that the aggregation level of the E-PDCCH or the UE receiving the E-PDCCH is i, the number of corresponding E-CCEs included is Mi, where 0 ⁇ i k.
  • the base station determines that the time-frequency resource used for transmitting the E-PDCCH is also an E-CCE that allocates the E-PDCCH, and the E-CCE that the time-frequency resource used for transmitting the E-PDCCH belongs to, and the E-CCE is considered to be allocated.
  • the E-PDCCH is carried.
  • the base station further divides all E-CCEs according to a preset granularity to form a resource set. For example, the base station divides the E-CCE according to the granularity to form a physical resource block (PRB), a physical resource block pair (PRB pair), a precoding resource block group (PRG), and a resource block group. (Resource Block Group, RBG) or CCE group.
  • PRB Physical resource block
  • PRB pair physical resource block pair
  • PRG precoding resource block group
  • RBG Resource Block Group
  • CCE group Resource Block Group
  • the E-CCE carrying the E-PDCCH may be one E-CCE in the resource set, or may be multiple E-CCEs therein.
  • a resource set includes four E-CCEs, namely E-CCE1, E-CCE2, E-CCE3, and P E-CCE4.
  • the E-CCE carrying the E-PDCCH includes E-CCEK E-CCE2, E-CCE3, and P E-CCE4.
  • the block shown by the oblique line in FIG. 3B indicates the time-frequency resource used for transmitting the E-PDCCH.
  • the first embodiment in which the base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to the formula (2) or (3) or (4) includes:
  • the base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to formula (2) or formula (3).
  • the base station If the total number of E-CCEs included in the resource set is less than or equal to the number of E-CCEs carrying the E-PDCCH included in the resource set, the base station generates an initial pseudo-random sequence corresponding to the DMRS according to formula (4). value.
  • the resource set includes a total of four E-CCEs, and the number of E-CCEs carrying the E-PDCCH is also four, so the base station uses the formula (4) to generate an initial pseudo-random sequence of the DMRS. value.
  • the base station calculates different initial values of the pseudo-random sequence by using different methods for the DMRS of the E-PDCCH transmitted in different time-frequency resources according to the aggregation level of the E-PDCCH, and can reduce transmission on different time-frequency resources.
  • the collision between DMRSs reduces interference and improves the performance of channel estimation, thereby improving the demodulation performance of E-PDCCH.
  • the second implementation manner in which the base station generates the initial value of the pseudo-random sequence corresponding to the DMRS according to the formula (2) or (3) or (4) is related to the space of the downlink control channel region to which the E-CCE carrying the E-PDCCH belongs.
  • the downlink control channel region is divided into a common search space and a user search space.
  • the public search space is used to transmit common control information, for example, system broadcast messages, paging messages, and random access messages, etc.
  • the user search space is used to transmit scheduling indication signaling for user uplink and downlink data transmission.
  • the common search space is fixed with a CCE with a sequence number of 0 to 15.
  • the CCE of the user search space is determined by the user ID and the PDCCH aggregation format.
  • the downlink control channel region carrying the E-PDCCH is also divided into a common search space and a user search space.
  • the base station Based on the above, the base station generates an initial pseudo-random sequence corresponding to the DMRS according to formula (2) or (3) or (4).
  • a second implementation of the initial value includes:
  • the base station If the E-CCE carrying the E-PDCCH belongs to a common search space of the downlink control channel region carrying the E-PDCCH, the base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to formula (2) or (3).
  • the base station If the E-CCE carrying the E-PDCCH belongs to the user search space of the downlink control channel region carrying the E-PDCCH, the base station generates an initial value of the pseudo-random sequence corresponding to the DMRS according to formula (4).
  • the base station calculates the initial value of the pseudo-random sequence by using different methods for calculating the DMRS of the E-PDCCH transmitted in different search spaces according to the search space of the downlink control channel region carrying the E-PDCCH, which may be reduced.
  • the collision between the DMRSs of the E-PDCCH transmitted in the search space reduces the interference, which is beneficial to improve the performance of the channel estimation and further improve the demodulation performance of the E-PDCCH.
  • the base station may use different initial values of pseudo-random sequences to generate corresponding DMRSs. For example, the base station may pre-store a correspondence between each DCI format and an initial value of the corresponding pseudo-random sequence. If the E-PDCCH of the different DCI format uses the initial value of the different pseudo-random sequence to generate the corresponding DMRS, the base station may determine the initial value of the pseudo-random sequence used by the E-PDCCH according to the DCI format of the E-PDCCH. Specifically, the base station may determine, according to the DCI format of the E-PDCCH, which formula in the formula (2) - formula (4) is used to generate an initial value of the pseudo-random sequence used by the E-PDCCH.
  • DCI downlink control information
  • the base station may use the initial value of the different pseudo-random sequence for the E-PDCCH of different aggregation levels to generate the corresponding DMRS according to the aggregation level of the E-PDCCH.
  • the base station may pre-store the correspondence between the aggregation levels and the initial values of the corresponding pseudo-random sequences. If the E-PDCCH of different aggregation levels uses the initial values of different pseudo-random sequences to generate the corresponding DMRS, the base station may determine the initial value of the pseudo-random sequence used by the E-PDCCH according to the aggregation level of the E-PDCCH. Specifically, the base station may determine, according to the aggregation level of the E-PDCCH, which formula in the formula (2) - formula (4) is used to generate an initial value of the pseudo-random sequence used by the E-PDCCH.
  • the base station may use the initial value of the same pseudo random sequence to generate a corresponding DMRS for the E-PDCCHs.
  • the base station determines the initial values of different pseudo-random sequences according to the DCI format or the E-PDCCH with different aggregation levels or aggregation levels, and generates DMRSs, which can reduce interference between E-PDCCHs of different DCI formats or aggregation levels. It is beneficial to improve the performance of channel estimation and further improve the demodulation performance of the E-PDCCH.
  • the extension scheduled by the E-PDCCH is also transmitted.
  • Extended Physical Downlink Shared Channel E-PDSCH. If the E-PDSCH is to be transmitted, the base station also needs to generate a DMRS for the E-PDSCH and send it to the UE to facilitate demodulation of the E-PDSCH by the UE.
  • the base station may generate an initial value of the pseudo-random sequence corresponding to the DMRS of the E-PDSCH according to the initial value of the pseudo-random sequence of the already generated DMRS corresponding to the E-PDCCH and the preset correspondence.
  • the corresponding relationship can be obtained by statistical analysis of the actual application data.
  • This embodiment can save resources compared with the process in the prior art that the base station directly generates the initial value of the pseudo-random sequence of the DMRS for the E-PDSCH.
  • FIG. 4 is a flowchart of a DMRS processing method according to another embodiment of the present invention. As shown in FIG. 4, the method in this embodiment includes:
  • Step 401 The UE generates information that is available before receiving the E-PDCCH sent by the base station.
  • the DMRS corresponding to the E-PDCCH is the DMRS corresponding to the E-PDCCH.
  • the UE generates a DMRS by using a method suitable for the base station, that is, using the information that can be learned before receiving the E-PDCCH instead of using the SCID to generate the DMRS required for demodulating the E-PDCCH.
  • the DMRS in this embodiment refers to a DMRS required for demodulating an E-PDCCH generated by the UE using previously known information.
  • Step 402 The UE detects the E-PDCCH according to the generated DMRS.
  • the UE when receiving the E-PDCCH, the UE generates a DMRS by using information that can be learned before receiving the E-PDCCH. At the same time, the UE also receives the DMRS sent by the base station.
  • the DMRS sent by the base station is generated and sent by the base station according to information that the UE can learn before receiving the E-PDCCH. For the process of generating DMRS by the base station, refer to the description of the previous embodiment of FIG. 4, which is described herein.
  • the UE performs channel estimation using the DMRS generated by itself, and acquires channel characteristics of the transmitted E-PDCCH. Then, the UE detects the E-PDCCH according to the result of the channel estimation.
  • the UE does not know the time-frequency resource used by the E-PDCCH or the E-CCE that carries the E-PDCCH. Therefore, for the UE, it is necessary to perform blind detection on the possible CCE combination until it detects its own E-PDCCH.
  • the UE generates demodulation using information that can be learned before receiving the E-PDCCH.
  • the DMRS required for the E-PDCCH solves the problem that the E-PDCCH cannot be demodulated by using the DMRS in which the SCID cannot generate the E-PDCCH, and the E-PDCCH is demodulated.
  • FIG. 5 is a flowchart of a DMRS processing method according to another embodiment of the present invention. As shown in FIG. 5, the method in this embodiment includes:
  • Step 501 The UE generates a pseudo random corresponding to the DMRS according to the cell ID and/or the RNTI of the cell where the UE is located. The initial value of the sequence.
  • Step 502 The UE generates a DMRS according to an initial value of the generated pseudo random sequence.
  • the initial value of the pseudo-random sequence corresponding to the DMRS generated by the UE is similar to the process of generating the initial value of the pseudo-random sequence corresponding to the DMRS by the base station, and details are not described herein again.
  • the UE may also generate an initial value of the pseudo-random sequence corresponding to the DMRS according to formula (2) or (3) or (4). The difference is that, for the UE, the sequence number of the receiving time slot corresponding to the DMRS in the formula, that is, the sequence number of the time slot of the DMRS sent by the receiving base station.
  • the process of generating the DMRS by the UE according to the initial value of the pseudo-random sequence is similar to the process of generating the DMRS by the base station according to the initial value of the pseudo-random sequence, and details are not described herein again.
  • the UE may also generate a DMRS according to formula (1).
  • the UE If the eNB generates the DMRS according to the maximum system bandwidth, the UE generates the DMRS according to the maximum system bandwidth, that is, the UE generates the DMRS whose length is the length corresponding to the maximum system bandwidth. If the eNB generates the DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, the UE generates the DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, that is, the UE also generates the pilot station corresponding to the E-PDCCH. The DMRS of the length corresponding to the bandwidth.
  • Step 503 The UE performs channel estimation according to the generated DMRS.
  • Step 504 The UE detects the E-PDCCH sent by the received base station according to the result of the channel estimation. Specifically, if the UE generates the DMRS according to the maximum system bandwidth, the UE intercepts the corresponding sequence from the generated DMRS according to the resource location where the generated DMRS is located, and performs channel estimation according to the intercepted sequence, that is, according to the intercepted sequence pair. The E-PDCCH is detected.
  • the UE If the UE generates the DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, the UE directly performs channel estimation according to the generated DMRS, that is, the UE directly detects the E-PDCCH according to the generated DMRS.
  • the UE uses the information that can be learned before the E-PDCCH is received to generate the DMRS required for demodulating the E-PDCCH, and solves the problem that the DMRS that cannot generate the E-PDCCH using the SCID can not be demodulated. , Demodulation of the E-PDCCH is implemented.
  • the process of the UE generating the initial value of the pseudo-random sequence corresponding to the DMRS according to the formula (2) or (3) or (4) includes:
  • the UE performs blind detection on various combinations of E-CCEs. If the UE performs blind detection, the total number of E-CCEs included in the resource set is greater than the number of E-CCEs that carry the E-PDCCH included in the resource set, and the UE according to formula (2) or (3), The initial value of the pseudo-random sequence corresponding to the DMRS is generated. If the result of the blind detection by the UE is that the total number of E-CCEs included in the set of resources is less than or equal to the bearer included in the resource set. The number of E-CCEs of the E-PDCCH, and the UE generates an initial value of the pseudo-random sequence corresponding to the DMRS according to the formula (4).
  • the base station After the base station divides all the E-CCEs according to the preset granularity to form a resource set, the base station advertises the total number of E-CCEs included in each resource set to the UE. That is to say, the UE knows in advance the total number of E-CCEs included in each resource set.
  • the process of the UE generating the initial value of the pseudo-random sequence corresponding to the DMRS according to the formula (2) or (3) or (4) includes:
  • the UE performs blind detection on various combinations of E-CCEs. If the E-CCE carrying the E-PDCCH belongs to the common search space of the downlink control channel region carrying the E-PDCCH, the UE generates a pseudo-random sequence corresponding to the DMRS according to formula (2) or (3). Initial value. If the result of the blind detection by the UE is that the E-CCE carrying the E-PDCCH carries the user search space of the downlink control channel region of the E-PDCCH, the UE generates an initial value of the pseudo-random sequence corresponding to the DMRS according to the formula (4).
  • the DMRS processing method has the following beneficial effects: 1.
  • the DMRS is generated by using the information that the UE can obtain before receiving the E-PDCCH, and the DMRS that the UE cannot generate the E-PDCCH according to the SCID is solved.
  • the problem solves the demodulation problem of the E-PDCCH.
  • 2. Generate various initial values of pseudo-random sequences for the DMRS of the E-PDCCH by various methods, such as aggregation level, control unit size, search space, and DCI format, which is beneficial for saving signaling and can be performed well. Interference randomization improves the performance and demodulation performance of the channel estimation of the E-PDCCH.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station of this embodiment includes: a first generation module 61 and a transmission module 62.
  • the first generation module 61 is configured to generate, according to information that the UE can obtain before receiving the E-PDCCH sent by the base station in this embodiment, the DMRS corresponding to the E-PDCCH.
  • the sending module 62 is connected to the first generating module 61, and is configured to send the DMRS generated by the first generating module 61 to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region, and send the DMRS to the UE.
  • the function modules of the base station in this embodiment can be used to perform the process of the DMRS processing method shown in FIG. 1.
  • the specific working principle is not described here. For details, refer to the description of the method embodiment.
  • the base station in this embodiment does not use the SCID to generate the DMRS required for demodulating the E-PDCCH, but generates the DMRS by using the information that the UE can obtain before receiving the E-PDCCH. Accordingly, the UE is also based on receiving the E- The information that can be learned before the PDCCH generates a DMRS before receiving the E-PDCCH, thereby completing demodulation of the E-PDCCH based on the generated DMRS, and overcoming that the UE cannot generate the DMRS based on the SCID as in the prior art. The defect solves the demodulation problem of the E-PDCCH.
  • FIG. 7 is a schematic structural diagram of a base station according to another embodiment of the present invention. The embodiment is implemented based on the embodiment shown in FIG. 6. As shown in FIG. 7, the base station in this embodiment includes a first generating module 61 and a sending module 62.
  • the first generation module 61 may specifically generate a DMRS required for demodulating the E-PDCCH according to the formula (1).
  • the first generation module 61 is specifically configured to generate the DMRS according to the maximum system bandwidth, that is, the first generation module 61 generates the length of the maximum system, if the number of the resource blocks included in the maximum system bandwidth is in the formula (1).
  • the sending module 62 is specifically configured to: according to the resource location where the DMRS generated by the first generating module 61 is located, intercept the corresponding sequence from the DMRS generated by the first generating module 61 and map to the transmission pilot corresponding to the downlink control channel region.
  • the time-frequency resource is sent to the UE.
  • the first generation module 61 If the ⁇ in the formula (1) is the number of resource blocks included in the bandwidth occupied by the pilot corresponding to £0011, the first generation module 61 generates the DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, that is, The first generation module 61 generates a DMRS having a length corresponding to the bandwidth occupied by the pilot corresponding to the E-PDCCH.
  • the sending module 62 is specifically configured to directly map the DMRS generated by the first generating module 61 to the time-frequency resource of the transmission pilot corresponding to the downlink control channel region, and send the DMRS to the UE.
  • the first generation module 61 of this embodiment includes: a first initial value generating unit 611 and a first pilot generating unit 612.
  • the first initial value generating unit 611 is configured to generate an initial value of the pseudo random sequence corresponding to the DMRS according to the cell identifier and/or the RNTI of the cell where the UE is located.
  • the first pilot generating unit 612 is connected to the first initial value generating unit 611 and the transmitting module 62, and is configured to generate a DMRS according to an initial value of the pseudo random sequence, and provide the generated DMRS to the sending module 62.
  • the first initial value generating unit 611 is specifically configured to generate an initial value of the pseudo random sequence corresponding to the DMRS according to the formula (2) or (3) or (4).
  • the RNTI in the formula (2) or the formula (3) or the formula (4) may be a C-RNTI, an SI-RNTI, a P-RNTI, a RA-RNTI, a TPC-PUCCH-RNTI, or a TPC-PUSCH-RNTI, but is not limited thereto. this.
  • the first initial value generating unit 611 is specifically configured to: when the total number of E-CCEs included in the resource set is greater than the number of E-CCEs carrying the E-PDCCH included in the resource set, according to formula (2) Or formula (3), generating an initial value of the pseudo-random sequence corresponding to the DMRS, and the total number of E-CCEs included in the resource set is less than or equal to the E-CCE carrying the E-PDCCH included in the resource set At the time of the number, the initial value of the pseudo-random sequence corresponding to the DMRS is generated according to the formula (4).
  • the resource set in this embodiment may be a PRB, a PRB pair, a PRG, or an RBG.
  • the first initial value generating unit 611 of the embodiment may be further configured to generate a pseudo corresponding to the DMRS according to the formula (2) or the formula (3) when the E-CCE carrying the E-PDCCH belongs to the common search space.
  • the initial value of the random sequence, and when the E-CCE carrying the E-PDCCH belongs to the user search space, the initial value of the pseudo-random sequence corresponding to the DMRS is generated according to the formula (4).
  • the base station of this embodiment includes: a determining module 63 in addition to the first generating module 61 and the sending module 62.
  • the determining module 63 is connected to the first generating module 61, and more specifically, is connected to the first pilot generating unit 612, and is configured to generate corresponding DMRSs by using initial values of different pseudo-random sequences in E-PDCCHs of different DCI formats.
  • the E-PDCCH of the different aggregation level is used to generate the corresponding DMRS by using the initial value of the different pseudo-random sequence
  • the pseudo-random used by the E-PDCCH is determined according to the DCI format of the E-PDCCH or the aggregation level of the E-PDCCH.
  • the initial value of the sequence is supplied to the first pilot generating unit 612.
  • the first pilot generating unit 612 is specifically configured to generate the DMRS corresponding to the E-PDCCH according to the initial value of the pseudo random sequence determined by the determining module 63.
  • the base station in this embodiment may further include: a second generation module 64.
  • the second generation module 64 is connected to the first initial value generating unit 611, and configured to generate a unit according to the first initial value.
  • the initial value of the pseudo-random sequence corresponding to the DMRS generated by the 611 and the preset correspondence relationship are generated, and an initial value of the pseudo-random sequence corresponding to the DMRS of the E-PDCCH scheduled by the E-PDCCH is generated.
  • Each of the foregoing functional modules or units may be used to perform the method flow for processing the DMRS by the foregoing base station, and the specific working principle is not described herein.
  • the base station in this embodiment does not use the SCID to generate the DMRS required for demodulating the E-PDCCH, but generates the DMRS by using the information that the UE can obtain before receiving the E-PDCCH. Accordingly, the UE is also based on receiving the E- The information that can be learned before the PDCCH is generated by the DMRS before the E-PDCCH is received, so that the demodulation of the E-PDCCH is completed based on the generated DMRS, and the defect that the UE cannot generate the DMRS based on the SCID as in the prior art is overcome, and the E- Demodulation problem of PDCCH.
  • FIG. 8 is a schematic structural diagram of a UE according to an embodiment of the present invention. As shown in FIG. 8, the UE in this embodiment includes: a third generation module 81 and a detection module 82.
  • the third generation module 81 is configured to generate a DMRS corresponding to the E-PDCCH by using information that can be learned before receiving the E-PDCCH sent by the base station.
  • the detecting module 82 is connected to the third generating module 81, and configured to detect the E-PDCCH according to the DMRS generated by the third generating module 81.
  • the function modules of the UE in this embodiment can be used to execute the process of the DMRS processing method shown in FIG. 4, and the specific working principle is not described here. For details, refer to the description of the method embodiment.
  • the UE in this embodiment cooperates with the base station provided by the embodiment of the present invention to generate a DMRS required for demodulating the E-PDCCH by using information that can be learned before receiving the E-PDCCH, and solves the problem that the DMRS that cannot generate the E-PDCCH by using the SCID is solved. Furthermore, the problem of the E-PDCCH cannot be demodulated, and demodulation of the E-PDCCH is realized.
  • FIG. 9 is a schematic structural diagram of a UE according to another embodiment of the present invention. The embodiment is implemented based on the embodiment shown in FIG. 8. As shown in FIG. 9, the UE in this embodiment also includes: a third generation module 81 and a detection module 82.
  • the third generation module 81 may generate a DMRS required for demodulating the E-PDCCH according to the formula (1).
  • the third generation module 81 is specifically configured to generate the DMRS according to the maximum system bandwidth, that is, the third generation module 81 generates the length of the maximum system, if the number of resource blocks included in the maximum system bandwidth is in the formula (1).
  • the detecting module 82 is specifically configured to: according to the resource location where the DMRS generated by the third generating module 81 is located, intercept the corresponding sequence from the DMRS generated by the third generating module 81, and detect the E-PDCCH according to the intercepted sequence. .
  • the third generation module 81 If the ⁇ in the formula (1) is the number of resource blocks included in the bandwidth occupied by the pilot corresponding to £0011, the third generation module 81 generates the DMRS according to the bandwidth occupied by the DMRS corresponding to the E-PDCCH, that is, The third generation module 81 generates a DMRS having a length corresponding to the bandwidth occupied by the pilot corresponding to the E-PDCCH.
  • the detecting module 82 is specifically configured to directly detect the E-PDCCH according to the DMRS generated by the third generating module 81.
  • the third generation module 81 of this embodiment includes: a second initial value generating unit 811 and a second pilot generating unit 812.
  • the second initial value generating unit 811 is configured to generate an initial value of the pseudo random sequence corresponding to the DMRS according to the cell identifier and/or the RNTI of the cell where the UE is located.
  • the second pilot generating unit 812 is connected to the second initial value generating unit 811 and the detecting module 82, and configured to generate a DMRS according to an initial value of the pseudo random sequence generated by the second initial value generating unit 811, and provide the generated DMRS.
  • the detection module 82 is provided.
  • the second initial value generating unit 811 is specifically configured to generate an initial value of the pseudo random sequence corresponding to the DMRS according to the formula (2) or (3) or (4).
  • the RNTI in the formula (2) or the formula (3) or the formula (4) may be a C-RNTI, an SI-RNTI, a P-RNTI, a RA-RNTI, a TPC-PUCCH-RNTI, or a TPC-PUSCH-RNTI, but is not limited thereto. this.
  • the second initial value generating unit 811 is specifically configured to use the total number of E-CCEs included in the resource set.
  • the initial value of the pseudo-random sequence corresponding to the DMRS is generated according to formula (2) or formula (3), and is included in the resource set.
  • the total number of E-CCEs is less than or equal to the number of E-CCEs carrying the E-PDCCH included in the resource set, an initial value of the pseudo-random sequence corresponding to the DMRS is generated according to formula (4).
  • the resource set in this embodiment may be a PRB, a PRB pair, a PRG, or an RBG.
  • the second initial value generating unit 811 of the embodiment may be further configured to generate a pseudo corresponding to the DMRS according to the formula (2) or the formula (3) when the E-CCE carrying the E-PDCCH belongs to the common search space.
  • Each of the foregoing functional modules or units may be used to perform the foregoing method for processing the DMRS by the UE, and the specific working principle is not described herein.
  • the UE in this embodiment cooperates with the base station provided by the embodiment of the present invention to generate a DMRS required for demodulating the E-PDCCH by using information that can be learned before receiving the E-PDCCH, and solves the problem that the DMRS that cannot generate the E-PDCCH by using the SCID is solved. Furthermore, the problem of the E-PDCCH cannot be demodulated, and demodulation of the E-PDCCH is realized.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

本发明提供一种解调导频信号处理方法、基站及用户设备。其中,一种处理方法包括:基站根据UE在接收到基站发送的E-PDCCH之前可以获知的信息,生成E-PDCCH对应的DMRS;基站将DMRS映射到下行控制信道区域对应的传输导频的时频资源上发送给UE。在本发明技术方案中,基站和UE不再使用SCID生成DMRS,解决了因UE在接收到E-PDCCH之前无法获取SCID无法生成DMRS,进而无法解调E-PDCCH的问题,解决了E-PDCCH的解调问题。

Description

解调导频信号处理方法、 基站及用户设备 本申请要求于 2012年 2月 1日提交中国专利局、 申请号为 CN 201210022525. 6、 发 明名称为 "解调导频信号处理方法、 基站及用户设备"的中国专利申请的优先权, 其全 部内容通过引用结合在本申请中。 技术领域 本发明涉及移动通信技术, 尤其涉及一种解调导频信号处理方法基站及用户设备。 背景技术 第三代合作伙伴计划(3rd Generation Partnership Project, 3 GPP)长期演进(Long Term Evolution, LTE) 通信系统中, 每个下行子帧中的时频资源被划分为两个区域: 下行控 制信道区域和下行数据信道区域; 其中, 下行控制信道区域占用前 N个正交频分复用 (Orthogonal Frequency Division Multiplexing, OFDM) 符号, N小于等于 3 ; 下行数据 信道区域占用剩余的 OFDM 符号。 物理下行控制信道 (Physical Downlink Control Channel, PDCCH) 用于传输用户上行或下行数据传输的调度指示信令, 例如数据信道 的资源分配、调制编码方式、 多天线传输、 混合自动重传请求(Hybrid Automatic Repeat Request, HARQ) 过程相关信息等。 多个用户的 PDCCH共享下行控制信道区域的时频 资源。 物理下行共享信道 (Physical Downlink Shared Channel, PDSCH) 用于传输用户 下行数据, 占用下行数据信道区域的时频资源。
由于每个用户的上行和下行数据调度都需要通过 PDCCH指示, 因此, 下行控制信 道区域的容量是影响小区可同时调度的用户数量的关键因素。 而引入了多点协作 ( Coordinated Multiple Points, CoMP) 和更加灵活的多用户多入多出 (Multiple User Multiple-Input Multiple-Output, MU-MIMO) 调度机制, 不仅提供了更高的频谱效率和 小区边缘用户性能, 同时显著增加了小区可同时服务的用户数量。 这样, LTE系统中 3 个 OFDM符号的下行控制信道区域无法满足需求, 于是出现了扩展 PDCCH (Extended Physical Downlink Control Channel, E-PDCCH), 以便于传输更多用户的上行或下行数 据传输的调度指示信令。 E-PDCCH 占用下行数据信道区域的部分时频资源, 通过频分 复用 (Frequency-Division Multiplexing, FDM) 或时分复用 (Time Division Multiplex, TDM) 和频分复用结合的方式与 PDSCH共享下行数据信道区域的时频资源。 E-PDCCH基于解调导频信号 (Demodulation Reference Signal, DMRS) 进行解调, 而 DMRS是用户设备(User Equipment, UE)特定的。 DMRS是根据小区标识(Cell ID) 和扰码序列标识( SCID)联合确定初始值的。对于 E-PDCCH来说, SCID会与 E-PDCCH 一起通知给 UE, 这样 UE就无法提前获知 SCID, 就无法获知解调 E-PDCCH所需的 DMRS, 也就无法对 E-PDCCH进行解调。 发明内容 本发明提供一种解调导频信号处理方法、基站及用户设备,用以提供解调 E-PDCCH 所需的 DMRS, 实现 E-PDCCH的成功解调。
本发明一方面提供一种解调导频信号处理方法, 包括:
基站根据用户设备 UE在接收到所述基站发送的扩展物理下行控制信道 E-PDCCH 之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS;
所述基站将所述 DMRS 映射到下行控制信道区域对应的传输导频的时频资源上发 送给所述 UE。
本发明一个方面提供一种基站, 包括:
第一生成模块, 用于根据用户设备 UE在接收到所述基站发送的扩展物理下行控制 信道 E-PDCCH之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS;
发送模块, 用于将所述第一生成模块生成的 DMRS 映射到下行控制信道区域对应 的传输导频的时频资源上发送给所述 UE。
本发明另一方面提供一种解调导频信号处理方法, 包括:
用户设备 UE使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH之前可以 获知的信息, 生成所述 E-PDCCH对应的 DMRS;
所述 UE根据所述 DMRS对所述 E-PDCCH进行检测。
本发明另一方面提供一种用户设备, 包括:
第三生成模块, 用于使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH之 前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS;
检测模块, 用于根据所述第三生成模块生成的 DMRS对所述 E-PDCCH进行检测。 本发明一方面提供的解调导频信号处理方法及基站, 基站根据 UE在接收到基站发 送的 E-PDCCH之前能够获知的信息, 生成解调 E-PDCCH所需的 DMRS, 然后发送给 UE, 这样 UE就能够在接收到 E-PDCCH之前使用相应的信息生成 DMRS, 进而根据生 成的 DMRS完成对 E-PDCCH的解调。由于基站和 UE生成 DMRS所使用的信息不再是 SCID, 解决了因 UE在接收到 E-PDCCH之前无法获取 SCID无法生成 DMRS, 进而无 法解调 E-PDCCH的问题, 解决了 E-PDCCH的解调问题。
本发明另一方面提供的解调导频信号处理方法及用户设备, UE与基站相配合, 通 过使用在接收到基站发送的 E-PDCCH之前能够获知的信息, 生成解调 E-PDCCH所需的 DMRS, 然后基于所生成的 DMRS完成对 E-PDCCH的解调。 由于基站和 UE生成 DMRS 所使用的信息不再是 SCID,解决了因 UE在接收到 E-PDCCH之前无法获取 SCID无法生成 DMRS, 进而无法解调 E-PDCCH的问题, 解决了 E-PDCCH的解调问题。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实施例或现有 技术描述中所需要使用的附图作一简单地介绍, 显而易见地, 下面描述中的附图是本发 明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动性的前提下, 还 可以根据这些附图获得其他的附图。
图 1为本发明一实施例提供的 DMRS处理方法的流程图;
图 2为本发明另一实施例提供的 DMRS处理方法的流程图;
图 3A为本发明一实施例提供的 CCE组成不同用户的 PDCCH的一种实现结构示意 图;
图 3B为本发明一实施例提供的承载 E-PDCCH的 E-CCE在控制单元组中的是一种 示意图;
图 4为本发明又一实施例提供的 DMRS处理方法的流程图;
图 5为本发明又一实施例提供的 DMRS处理方法的流程图;
图 6为本发明一实施例提供的基站的结构示意图;
图 7为本发明另一实施例提供的基站的结构示意图;
图 8为本发明一实施例提供的 UE的结构示意图;
图 9为本发明另一实施例提供的 UE的结构示意图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发明实施例中 的附图, 对本发明实施例中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例 是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技 术人员在没有作出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范 围。
图 1为本发明一实施例提供的 DMRS处理方法的流程图。 如图 1所示, 本实施例 的方法包括:
步骤 101、 基站根据 UE在接收到基站发送的 E-PDCCH之前可以获知的信息, 生 成 E-PDCCH对应的 DMRS。
为了解决 UE无法在接收到 E-PDCCH之前获知 SCID, 无法根据 SCID和小区 ID 生成解调 E-PDCCH的 DMRS的问题, 本实施例基站不再使用 SCID生成 E-PDCCH, 而是使用 UE在接收到 E-PDCCH之前可以获知的信息,例如小区 ID或无线网络临时标 识(Radio Network Temporary Identifier, RNTI)等, 生成解调 E-PDCCH所需的 DMRS。 其中, 所述信息可以是 UE在接收 E-PDCCH之前可以获知的任何信息。
其中, 本实施例的 DMRS是指由基站生成的用于解调 E-PDCCH所需的 DMRS。 步骤 102、基站将 DMRS映射到下行控制信道区域对应的传输导频的时频资源上发 送给 UE。
具体的,只有在有 E-PDCCH要发送的时候,基站才会生成 DMRS。基站生成 DMRS 后, 将 DMRS映射到下行控制信道区域对应的传输导频的时频资源上发送给 UE。 在本 实施例中, 基站还会以频分复用或者以时分复用和频分复用联合的方式等将 E-PDCCH 映射到下行数据信道区域中用于传输导频的时频资源上。
在此说明, 本实施例所述的下行控制信道区域是指现有技术中的下行控制信道区 域, 即主要用于承载用户的 PDCCH的时频资源, 本实施例所述的下行数据信道区域是 指现有技术中的下行数据信道区域, 即原来主要用于承载用户的 PDSCH的时频资源。
在本实施例中, 基站不再使用 SCID生成解调 E-PDCCH所需的 DMRS, 而是使用 UE在接收到 E-PDCCH之前可以获知的信息生成 DMRS, 相应的, UE也会基于在接收 到 E-PDCCH之前能够获知的信息在接收到 E-PDCCH之前生成 DMRS, 从而基于生成 的 DMRS完成对 E-PDCCH的解调, 克服了 UE无法像现有技术那样基于 SCID生成 DMRS的缺陷, 解决了 E-PDCCH的解调问题。
图 2为本发明另一实施例提供的 DMRS处理方法的流程图。 如图 2所示, 本实施 例的方法包括: 步骤 201、 基站根据 UE所在小区的小区 ID和 /或 RNTI, 生成 DMRS对应的伪随 机序列的初始值。
步骤 202、 基站根据伪随机序列的初始值, 生成 DMRS。
在本实施例中, 基站以 UE在接收到 E-PDCCH之前可以获知的信息为小区 ID和 / 或 RNTI为例生成解调 E-PDCCH所需的 DMRS ,但所使用的信息不限于此。其中, RNTI 可以是小区无线网络临时标识 (Cell RNTI , C-RNTI ) 、 系统消息无线网络临时标识 ( System Information RNTI, SI-RNTI)、寻呼无线网络临时标识(Paging RNTI, P-RNTI) 或随机接入无线网络临时标识(Random Access RNTI, RA-RNTI) 、 发送功率控制物理 上行控制信道无线网络临时标识 (Transmit Power Control-Physical Uplink Control Channel-RNTI, TPC-PUCCH-RNTI) 发送功率控制物理上行共享信道无线网络临时标 识(Transmit Power Control-Physical Uplink Shared Channel-RNTI, TPC-PUSCH-RNTI) , 但不限于此。 具体的, 基站根据公式 (1 ) 生成第一 DMRS。 r(m) = -^(1-2 · c(2w》+j (l -2 · c(2m + 1))
2 V2 ( D 其中, 表示 DMRS的序列; = 0,1 ,12N^ _ 1 ; c表示伪随机序列。其中, 是最大系统带宽包含的资源块的个数, 或者是 E-PDCCH对应的导频, 即 DMRS , 所占 的带宽包含的资源块个数。 其中, 如果 是最大系统带宽包含的资源块的个数, 则基站会按照最大系统带宽 生成 DMRS , 即基站会生成长度为该最大系统带宽对应的长度的 DMRS。 如果 ^^是 E-PDCCH对应的导频所占的带宽包含的资源块个数, 则基站会按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS , 即基站会生成长度为该 E-PDCCH对 应的导频所占的带宽对应的长度的 DMRS。
在本实施例中,基站根据 UE所在小区的小区 ID和 /或 RNTI生成伪随机序列 c的初 始值。
举例说明, 基站可以根据公式 (2), 生成 DMRS对应的伪随机序列 c的初始值。 t =L"s/2」29 + ( 2 ) 其中, 为 DMRS对应的伪随机序列 c的初始值; "s为 DMRS对应的发送时隙的 序号, 即发送 DMRS的时隙的序号; Vro为 UE所在小区的小区 ID
又例如, 基站还可以根据公式 (3 ) 生成 DMRS对应的伪随机序列 c的初始值。 cimt = (L"s/2」+l)' (2A^ +l) .29 +^ ( 3 ) 在公式 (2) 和公式 (3 ) 中仅包括 UE所在小区的 ID, 即基站仅用小区 ID对伪随 机序列 c进行加扰, 生成伪随机序列 c的初始值。
再例如, 基站还可以根据公式 (4) 生成 DMRS对应的伪随机序列 c的初始值。 cimt = (L"s/2」 + l) '(2^ +l)' 216 +" 在公式 (4) 中同时包括小区 ID和 RNTI, 基站使用 RNTI对伪随机序列进行加扰 生成伪随机序列 c的初始值。 在此说明, 在上述公式 (2) -公式 (4) 中, L"S/2」表示对时隙序号除以 2所得的 商向下取整。
当基站根据公式 (2) 或 (3 ) 或 (4) 生成 DMRS对应的伪随机序列 c的初始值后, 基站根据公式 (1 ) 生成 DMRS
除了上述公式 (2) -公式 (4) 夕卜, 基站还可以使用公式 (2) 或 (3 ) 或 (4) 的变 形公式生成伪随机序列的初始值。 另外, 基站还可以仅使用 RNTI生成伪随机序列的初 始值。
步骤 203、基站将 DMRS映射到下行控制信道区域对应的传输导频的时频资源上发 送给 UE
其中, 如果基站按照最大系统带宽生成 DMRS, 则基站按照 DMRS所在的资源位 置, 从 DMRS 中截取相应的序列映射到下行控制信道区域对应的传输导频的时频资源 上发送给 UE
如果基站按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS,则基站会直接将所 生成的 DMRS映射到下行控制信道区域对应的传输导频的时频资源上发送给 UE
在本实施例中, 基站具体根据 UE所在小区的小区 ID禾 P/或 RNTI生成 DMRS对应 的伪随机序列的初始值, 进而根据伪随机序列的初始值生成 DMRS, 所使用的小区 ID 和 /或 RNTI都是 UE在接收到 E-PDCCH之前可以获知的信息, 因此, UE可以使用与 基站相同的生成方式在接收到 E-PDCCH之前生成 DMRS,为使用生成的 DMRS成功解 调 E-PDCCH打下基础, 解决了现有技术中 UE无法根据 SCID生成 DMRS而无法解调 E-PDCCH的问题。 其中, 由于公式 (2) 或 (3 ) 或 (4) 不同, 故基站根据公式 (2) 或 (3 ) 或 (4) 生成的 DMRS 对应的伪随机序列的初始值也会不同。 下面实施例提供几种基站根据公 式 (2) 或 (3 ) 或 (4) 生成 DMRS对应的伪随机序列的初始值的实施方式。
基站根据公式 (2) 或 (3 ) 或 (4) 生成 DMRS对应的伪随机序列的初始值的第一 种实施方式与 E-PDCCH的聚合级别有关。 在介绍 E-PDCCH的聚合级别之前, 先介绍 一下现有技术中 PDCCH的聚合级别。 长期演进(Long Term Evolution, LTE)系统定义 了控制信道单元 (Control Channel Element, CCE) 作为 PDCCH资源组成单元, 每个 CCE映射于下行控制信道区域内的一组特定时频格点, 即资源元素(Resource Element, RE) 上。 PDCCH可以由 1, 2, 4, 8个 CCE组成, 分别对应不同的编码码率, 也就是 说 PDCCH有 4个聚合级别, 每个聚合级别包含的 CCE个数为 1, 2, 3, 4。 CCE组成 不同用户的 PDCCH 的一种实现结构如图 3A所示。 其中, CCE0-CCE3 组成 UE1 的 PDCCH; CCE4-CCE5组成 UE2的 PDCCH; CCE6-CCE7组成 UE3的 PDCCH; CCE8、 CCE9、 CCE10分别组成 UE4、 UE5和 UE6的 PDCCH。 其中, 用户的 PDCCH由几个 和哪几个 CCE构成是由基站根据用户信信道条件决定的, 基站确定后会通告给 UE。
与 PDCCH相类似, LTE系统也为 E-PDCCH定义了扩展控制信道单元 (Extended
Control Channel Element, E-CCE), 并且 E-PDCCH也可以以 E-CCE为单元进行资源分 配。每个 E-CCE映射在承载 E-PDCCH的下行数据信道区域内的特定时频格点上。其中, 根据构成 E-PDCCH的 E-CCE的数量不同, 定义出多个 E-PDCCH的聚合级别。 例如 E-PDCCH的聚合级别有 k种, 分别包含的 E-CCE的个数分别为 Ml, M2, ..., Mk。
具体的, 基站在发送 E-PDCCH给 UE之前, 基站会确定发送 E-PDCCH使用的时 频资源, 也就确定了 E-PDCCH的聚合级别或接收该 E-PDCCH的 UE的聚合级别。 例 如, 如果基站确定 E-PDCCH或接收该 E-PDCCH的 UE的聚合级别为 i, 则对应的包含 的 E-CCE的个数为 Mi, 其中, 0<i k。 其中, 基站确定发送 E-PDCCH使用的时频资 源也可以说是分配承载 E-PDCCH的 E-CCE, 发送 E-PDCCH使用的时频资源属于哪个 E-CCE, 则认为分配该 E-CCE来承载 E-PDCCH。
进一步, 基站还会将所有 E-CCE按照预设的粒度进行划分, 从而形成资源集合。 例如, 基站按照粒度对 E-CCE进行划分, 形成物理资源块 (Physical Resource Block, PRB), 物理资源块对 (PRB pair), 预编码资源块组 (Precoding Resource Block Group, PRG), 资源块组(Resource Block Group, RBG)或 CCE组(group)。其中, PRB, PRB pair, PRG, RBG或 CCE组即为所述资源集合。 基于上述, 当基站分配承载 E-PDCCH的 E-CCE后, 结合每个 E-CCE的位置以及 划分出的每个资源集合的范围,就可以确定出承载 E-PDCCH的 E-CCE分别位于哪个资 源集合。 其中, 承载 E-PDCCH的 E-CCE可以是资源集合中的一个 E-CCE, 也可能是 其中的多个 E-CCE。 如图 3B所示, 一个资源集合包括 4个 E-CCE, 分别为 E-CCE1、 E-CCE2、 E-CCE3禾 P E-CCE4。 在图 3B中, 承载 E-PDCCH的 E-CCE包括 E-CCEK E-CCE2、 E-CCE3禾 P E-CCE4。 其中, 图 3B中斜线示出的方块表示发送 E-PDCCH使用 的时频资源。
基于上述, 基站根据公式 (2 ) 或 (3 ) 或 (4 ) 生成 DMRS对应的伪随机序列的初 始值的第一种实施方式包括:
如果资源集合所包含的 E-CCE的总个数大于该资源集合所包含的承载 E-PDCCH的
E-CCE的个数, 基站根据公式 (2 ) 或公式 (3 ) , 生成 DMRS对应的伪随机序列的初 始值。
如果资源集合所包含的 E-CCE 的总个数小于或等于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数, 基站根据公式 (4) , 生成 DMRS对应的伪随机序列的初 始值。
以图 3B为例,资源集合一共包括 4个 E-CCE,而所包含的承载 E-PDCCH的 E-CCE 的个数也是 4个, 故基站使用公式 (4 ) 生成 DMRS的伪随机序列的初始值。
在本实施方式中, 基站根据 E-PDCCH 的聚合级别, 对在不同时频资源中传输的 E-PDCCH的 DMRS使用不同的方法计算伪随机序列的初始值, 可以降低在不同时频资 源上传输的 DMRS 之间的碰撞, 降低干扰, 有利于提高信道估计的性能, 进而提高 E-PDCCH的解调性能。
基站根据公式 (2 ) 或 (3 ) 或 (4 ) 生成 DMRS对应的伪随机序列的初始值的第二 种实施方式与承载 E-PDCCH的 E-CCE所属的下行控制信道区域的空间有关。 在 LTE 系统中, 下行控制信道区域被划分为公共搜索空间和用户搜索空间。 其中, 公共搜索空 间用于传输公共控制信息, 比如, 系统广播消息、 寻呼消息和随即接入消息等, 的调度 指示信令; 用户搜索空间用于传输用户上下行数据传输的调度指示信令。 公共搜索空间 固定包含序号为 0〜15的 CCE,用户搜索空间的 CCE由用户 ID和 PDCCH聚合格式决 定。 与下行控制信道区域相类似, 承载 E-PDCCH的下行控制信道区域也被划分为公共 搜索空间和用户搜索空间。
基于上述, 基站根据公式 (2 ) 或 (3 ) 或 (4 ) 生成 DMRS对应的伪随机序列的初 始值的第二种实施方式包括:
如果承载 E-PDCCH的 E-CCE属于承载 E-PDCCH的下行控制信道区域的公共搜索 空间, 基站根据公式 (2) 或 (3 ) , 生成 DMRS对应的伪随机序列的初始值。
如果承载 E-PDCCH的 E-CCE属于承载 E-PDCCH的下行控制信道区域的用户搜索 空间, 基站根据公式 (4) , 生成 DMRS对应的伪随机序列的初始值。
在本实施方式中, 基站根据承载 E-PDCCH的下行控制信道区域的搜索空间, 对在 不同搜索空间中传输的 E-PDCCH的 DMRS使用不同的方法计算伪随机序列的初始值, 可以降低在不搜索空间中传输的 E-PDCCH的 DMRS之间的碰撞, 降低干扰, 有利于提 高信道估计的性能, 进而提高 E-PDCCH的解调性能。
进一步, 对于不同下行控制信息 (DCI) 格式 (format) 的 E-PDCCH, 基站可以使 用不同的伪随机序列的初始值为其生成对应的 DMRS。例如, 基站可以预先存储各 DCI 格式与对应的伪随机序列的初始值的对应关系。如果不同 DCI格式的 E-PDCCH使用不 同伪随机序列的初始值生成所对应的 DMRS, 则基站可以根据 E-PDCCH的 DCI格式, 确定该 E-PDCCH使用的伪随机序列的初始值。具体的,基站可以根据 E-PDCCH的 DCI 格式, 确定使用公式 (2) -公式 (4) 中哪个公式来生成该 E-PDCCH使用的伪随机序列 的初始值。
或者, 基站也可以根据 E-PDCCH的聚合级别, 对于不同聚合级别的 E-PDCCH使 用不同伪随机序列的初始值为其生成对应的 DMRS。例如, 基站可以预先存储各聚合级 别与对应的伪随机序列的初始值的对应关系。 如果不同聚合级别的 E-PDCCH使用不同 伪随机序列的初始值生成所对应的 DMRS, 则基站可以根据 E-PDCCH的聚合级别, 确 定该 E-PDCCH使用的伪随机序列的初始值。 具体的, 基站可以根据 E-PDCCH的聚合 级别, 确定使用公式 (2) -公式 (4) 中哪个公式来生成该 E-PDCCH使用的伪随机序列 的初始值。
优选的, 对于 DCI格式相同或聚合级别相同的 E-PDCCH, 基站可以使用相同的伪 随机序列的初始值为该这些 E-PDCCH生成对应的 DMRS。
其中,基站根据 DCI format或聚合级别为不同 DCI格式或聚合级别的 E-PDCCH确 定不同的伪随机序列的初始值, 进而生成 DMRS, 可以降低不同 DCI格式或聚合级别 的 E-PDCCH之间的干扰, 有利于提高信道估计的性能, 进而提高 E-PDCCH的解调性 能。
对基站来说, 除了要发送 E-PDCCH之外, 还会发送该 E-PDCCH所调度的扩展物 理下行共享信道 (Extended Physical Downlink Shared Channel, E-PDSCH) 。 如果要发 送 E-PDSCH,基站也需要为 E-PDSCH生成 DMRS,并发送给 UE以便于 UE对 E-PDSCH 进行解调。
优选的,基站可以根据 E-PDCCH对应的已经生成的 DMRS的伪随机序列的初始值 和预设对应关系, 生成 E-PDSCH的 DMRS对应的伪随机序列的初始值。 其中, 对应关 系可以通过对实际应用数据进行统计分析来获取。该实施方式与现有技术中基站直接为 E-PDSCH生成 DMRS的伪随机序列的初始值的过程相比, 可以节省资源。
图 4为本发明又一实施例提供的 DMRS处理方法的流程图。 如图 4所示, 本实施 例的方法包括:
步骤 401、 UE 使用在接收到基站发送的 E-PDCCH之前可以获知的信息, 生成
E-PDCCH对应的 DMRS。
在本实施例中, UE 使用与基站相适应的方法生成 DMRS , 即使用在接收到 E-PDCCH之前可以获知的信息而不是使用 SCID生成解调 E-PDCCH所需的 DMRS。
其中, 本实施例的 DMRS是指由 UE使用预先可获知的信息生成的解调 E-PDCCH 所需的 DMRS。
步骤 402、 UE根据生成的 DMRS对 E-PDCCH进行检测。
具体的, UE在接收到 E-PDCCH时, 使用在接收到 E-PDCCH之前可以获知的信息 生成 DMRS。 同时, UE还会接收到基站发送的 DMRS。 其中, 基站发送的 DMRS是基 站根据 UE在接收到 E-PDCCH之前可以获知的信息生成并发送的。关于基站生成 DMRS 的过程可参见图 4之前实施例的描述, 在此赘述。
UE使用自己生成的 DMRS进行信道估计, 获取传输 E-PDCCH的信道特性。然后, UE根据信道估计的结果, 对 E-PDCCH进行检测。
其中, UE并不知道 E-PDCCH所使用的时频资源或承载 E-PDCCH的 E-CCE。故对 UE来说, 需要对可能的 CCE组合进行盲检测, 直到检测到自己的 E-PDCCH。
在本实施例中, UE 使用在接收到 E-PDCCH 之前可以获知的信息生成解调
E-PDCCH所需的 DMRS, 解决了使用 SCID无法生成 E-PDCCH的 DMRS进而无法解 调 E-PDCCH的问题, 实现了对 E-PDCCH的解调。
图 5为本发明又一实施例提供的 DMRS处理方法的流程图。 如图 5所示, 本实施 例的方法包括:
步骤 501、 UE根据 UE所在小区的小区 ID和 /或 RNTI, 生成 DMRS对应的伪随机 序列的初始值。
步骤 502、 UE根据生成的伪随机序列的初始值, 生成 DMRS。
其中, UE生成 DMRS对应的伪随机序列的初始值与基站生成 DMRS对应的伪随机 序列的初始值的过程相类似, 在此不再赘述。 优选的, UE也可以根据公式 (2) 或(3 ) 或(4)生成 DMRS对应的伪随机序列的初始值。其区别在于, 对 UE来说, 公式中的 为 DMRS对应的接收时隙的序号, 即接收基站发送的 DMRS的时隙的序号。
UE 根据伪随机序列的初始值生成 DMRS 与基站根据伪随机序列的初始值生成 DMRS的过程相类似, 在此不再赘述。 优选的, UE也可以根据公式 (1 ) 生成 DMRS。
其中, 如果基站按照最大系统带宽生成 DMRS, 相应的, UE按照最大系统带宽生 成 DMRS , 即 UE 生成长度为该最大系统带宽对应的长度的 DMRS。 如果基站按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS, 相应的, UE按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS, 即 UE也会生成长度为该 E-PDCCH对应的导频所占的 带宽对应的长度的 DMRS。
步骤 503、 UE根据生成的 DMRS进行信道估计。
步骤 504、 UE根据信道估计的结果, 对接收到的基站发送的 E-PDCCH进行检测。 具体的, 如果 UE按照最大系统带宽生成 DMRS, 则 UE按照所生成的 DMRS所在 的资源位置, 从生成的 DMRS 中截取相应的序列, 根据所截取的序列进行信道估计, 即根据所截取的序列对 E-PDCCH进行检测。
如果 UE按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS, 则 UE直接根据所 生成的 DMRS进行信道估计, 即 UE直接根据所生成的 DMRS对 E-PDCCH进行检测。
在本实施例中, UE 使用在接收到 E-PDCCH 之前可以获知的信息生成解调 E-PDCCH所需的 DMRS, 解决了使用 SCID无法生成 E-PDCCH的 DMRS进而无法解 调 E-PDCCH的问题, 实现了对 E-PDCCH的解调。
进一步, 如果基站采用第一种实施方式生成 DMRS 对应的伪随机序列的初始值, 则 UE根据公式 (2) 或 (3 ) 或 (4) 生成 DMRS对应的伪随机序列的初始值的过程包 括:
UE对 E-CCE的各种组合进行盲检测。 如果 UE进行盲检测的结果为资源集合所包 含的 E-CCE的总个数大于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数, UE根 据公式 (2)或(3 ) , 生成 DMRS对应的伪随机序列的初始值。 如果 UE进行盲检测的 结果为资源哪集合所包含的 E-CCE 的总个数小于或等于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数, UE根据公式 (4) , 生成 DMRS对应的伪随机序列的初 始值。
其中, 基站按照预设粒度对所有 E-CCE进行划分形成资源集合后, 会将每个资源 集合所包含的 E-CCE的总个数通告给 UE。 也就是说, UE会预先获知每个资源集合所 包含的 E-CCE的总个数。
如果基站采用第二种实施方式生成 DMRS对应的伪随机序列的初始值,则 UE根据 公式 (2) 或 (3 ) 或 (4) 生成 DMRS对应的伪随机序列的初始值的过程包括:
UE对 E-CCE的各种组合进行盲检测。如果 UE进行盲检测的结果为承载 E-PDCCH 的 E-CCE属于承载 E-PDCCH的下行控制信道区域的公共搜索空间, UE根据公式 (2) 或 (3 ) , 生成 DMRS对应的伪随机序列的初始值。 如果 UE进行盲检测的结果为承载 E-PDCCH的 E-CCE承载 E-PDCCH的下行控制信道区域的用户搜索空间, UE根据公式 (4) , 生成 DMRS对应的伪随机序列的初始值。
综上所述, 本发明各实施例提供的 DMRS 处理方法具有以下有益效果: 1、 使用 UE在接收 E-PDCCH之前可以获取的信息生成 DMRS,解决了 UE无法根据 SCID生成 E-PDCCH的 DMRS的问题, 解决了 E-PDCCH的解调问题。 2、 通过各种方式, 例如聚 合级别, 控制单元大小, 搜索空间以及 DCI format等, 为 E-PDCCH的 DMRS生成不同 的伪随机序列的初始值, 有利于节约信令, 并可以很好的进行干扰随机化, 提高了 E-PDCCH的信道估计的性能和解调性能。
图 6为本发明一实施例提供的基站的结构示意图。 如图 6所示, 本实施例的基站包 括: 第一生成模块 61和发送模块 62。
其中, 第一生成模块 61, 用于根据 UE在接收到本实施例的基站发送的 E-PDCCH 之前可以获知的信息, 生成 E-PDCCH对应的 DMRS。
发送模块 62, 与第一生成模块 61连接, 用于将第一生成模块 61生成的 DMRS映 射到下行控制信道区域对应的传输导频的时频资源上发送给 UE。
本实施例基站的各功能模块可用于执行图 1所示 DMRS处理方法的流程, 其具体 工作原理不再赘述, 详见方法实施例的描述。
本实施例的基站不再使用 SCID生成解调 E-PDCCH所需的 DMRS, 而是使用 UE 在接收到 E-PDCCH之前可以获知的信息生成 DMRS, 相应的, UE也会基于在接收到 E-PDCCH之前能够获知的信息在接收到 E-PDCCH之前生成 DMRS, 从而基于生成的 DMRS完成对 E-PDCCH的解调,克服了 UE无法像现有技术那样基于 SCID生成 DMRS 的缺陷, 解决了 E-PDCCH的解调问题。
图 7为本发明另一实施例提供的基站的结构示意图。本实施例基于图 6所示实施例 实现, 如图 7所示, 本实施例的基站包括第一生成模块 61和发送模块 62。
其中, 第一生成模块 61具体可根据公式 (1 ) 生成解调 E-PDCCH所需的 DMRS。 其中, 如果公式 (1 ) 中的 是最大系统带宽包含的资源块的个数, 则第一生成 模块 61具体用于按照最大系统带宽生成 DMRS,即第一生成模块 61会生成长度为该最 大系统带宽对应的长度的 DMRS。 相应地, 发送模块 62具体用于按照第一生成模块 61 生成的 DMRS所在的资源位置,从第一生成模块 61所生成的 DMRS中截取相应的序列 映射到下行控制信道区域对应的传输导频的时频资源上发送给 UE。 如果公式(1 )中的 ^^是£ 00 11对应的导频所占的带宽包含的资源块个数, 则 第一生成模块 61会按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS, 即第一生成 模块 61会生成长度为该 E-PDCCH对应的导频所占的带宽对应的长度的 DMRS。 相应 地, 发送模块 62具体用于直接将第一生成模块 61生成的 DMRS映射到下行控制信道 区域对应的传输导频的时频资源上发送给 UE。
进一步, 本实施例的第一生成模块 61包括: 第一初始值生成单元 611和第一导频 生成单元 612。
其中, 第一初始值生成单元 611, 用于根据 UE所在小区的小区标识和 /或 RNTI, 生成 DMRS对应的伪随机序列的初始值。
第一导频生成单元 612,和第一初始值生成单元 611和发送模块 62连接,用于根据 伪随机序列的初始值, 生成 DMRS, 并将生成的 DMRS提供给发送模块 62。
进一步,第一初始值生成单元 611具体用于根据公式(2)或(3 )或(4)生成 DMRS 对应的伪随机序列的初始值。
其中, 公式 (2) 或公式 (3 ) 或公式 (4) 中的 RNTI可以是 C-RNTI、 SI-RNTI、 P-RNTI RA-RNTI TPC-PUCCH-RNTI或 TPC-PUSCH-RNTI, 但不限于此。
更进一步, 第一初始值生成单元 611具体用于在资源集合所包含的 E-CCE的总个 数大于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数时, 根据公式 (2) 或公式 ( 3 ), 生成 DMRS对应的伪随机序列的初始值, 而在资源集合所包含的 E-CCE的总个 数小于或等于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数时, 根据公式(4) , 生成 DMRS对应的伪随机序列的初始值。
其中, 本实施例的资源集合可以是 PRB、 PRB对、 PRG或 RBG等。 更进一步, 本实施例的第一初始值生成单元 611还可以具体用于在承载 E-PDCCH 的 E-CCE属于公共搜索空间时, 根据公式 (2) 或公式 (3 ) , 生成 DMRS对应的伪随 机序列的初始值, 而在承载 E-PDCCH的 E-CCE属于用户搜索空间时, 根据公式(4) , 生成 DMRS对应的伪随机序列的初始值。
进一步, 本实施例的基站除了包括第一生成模块 61和发送模块 62之外, 还包括: 确定模块 63。
其中, 确定模块 63与第一生成模块 61, 更为具体的是与第一导频生成单元 612连 接, 用于在不同 DCI 格式的 E-PDCCH 使用不同伪随机序列的初始值生成所对应的 DMRS时, 或者在不同聚合级别的 E-PDCCH使用不同伪随机序列的初始值生成所对应 的 DMRS时, 根据 E-PDCCH的 DCI格式或 E-PDCCH的聚合级别, 确定该 E-PDCCH 使用的伪随机序列的初始值, 并将确定的结果提供给第一导频生成单元 612。
相应地, 第一导频生成单元 612具体用于根据确定模块 63确定的伪随机序列的初 始值, 生成该 E-PDCCH对应的 DMRS。
进一步, 本实施例的基站还可以包括: 第二生成模块 64。
第二生成模块 64, 与第一初始值生成单元 611连接,用于根据第一初始值生成单元
611生成的 DMRS对应的伪随机序列的初始值和预设对应关系, 生成 E-PDCCH调度的 E-PDSCH的 DMRS对应的伪随机序列的初始值。
上述各功能模块或单元可用于执行上述基站对 DMRS 进行处理的方法流程, 其具 体工作原理不再赘述。
本实施例的基站不再使用 SCID生成解调 E-PDCCH所需的 DMRS, 而是使用 UE 在接收到 E-PDCCH之前可以获知的信息生成 DMRS, 相应的, UE也会基于在接收到 E-PDCCH之前能够获知的信息在接收到 E-PDCCH之前生成 DMRS, 从而基于生成的 DMRS完成对 E-PDCCH的解调,克服了 UE无法像现有技术那样基于 SCID生成 DMRS 的缺陷, 解决了 E-PDCCH的解调问题。
图 8为本发明一实施例提供的 UE的结构示意图。 如图 8所示, 本实施例的 UE包 括: 第三生成模块 81和检测模块 82。
其中, 第三生成模块 81, 用于使用在接收到基站发送的 E-PDCCH之前可以获知的 信息, 生成 E-PDCCH对应的 DMRS。
检测模块 82, 与第三生成模块 81连接, 用于根据第三生成模块 81生成的 DMRS 对 E-PDCCH进行检测。 本实施例 UE的各功能模块可用于执行图 4所示 DMRS处理方法的流程,其具体工 作原理不再赘述, 详见方法实施例的描述。
本实施例的 UE与本发明实施例提供的基站相配合, 使用在接收到 E-PDCCH之前 可以获知的信息生成解调 E-PDCCH 所需的 DMRS , 解决了使用 SCID 无法生成 E-PDCCH的 DMRS进而无法解调 E-PDCCH的问题, 实现了对 E-PDCCH的解调。
图 9为本发明另一实施例提供的 UE的结构示意图。 本实施例基于图 8所示实施例 实现, 如图 9所示, 本实施例的 UE也包括: 第三生成模块 81和检测模块 82。
其中, 第三生成模块 81可根据公式 (1 ) 生成解调 E-PDCCH所需的 DMRS。 其中, 如果公式 (1 ) 中的 是最大系统带宽包含的资源块的个数, 则第三生成 模块 81具体用于按照最大系统带宽生成 DMRS,即第三生成模块 81会生成长度为该最 大系统带宽对应的长度的 DMRS。 相应地, 检测模块 82具体用于按照第三生成模块 81 生成的 DMRS所在的资源位置,从第三生成模块 81所生成的 DMRS中截取相应的序列, 根据所截取的序列对 E-PDCCH进行检测。 如果公式(1 )中的 ^^是£ 00 11对应的导频所占的带宽包含的资源块个数, 则 第三生成模块 81会按照 E-PDCCH对应的 DMRS所占的带宽生成 DMRS, 即第三生成 模块 81会生成长度为该 E-PDCCH对应的导频所占的带宽对应的长度的 DMRS。 相应 地,检测模块 82具体用于直接根据第三生成模块 81所生成的 DMRS对 E-PDCCH进行 检测。
进一步, 本实施例的第三生成模块 81包括: 第二初始值生成单元 811和第二导频 生成单元 812。
其中, 第二初始值生成单元 811, 用于根据 UE所在小区的小区标识和 /或 RNTI, 生成 DMRS对应的伪随机序列的初始值。
第二导频生成单元 812,和第二初始值生成单元 811和检测模块 82连接,用于根据 第二初始值生成单元 811生成的伪随机序列的初始值, 生成 DMRS, 并将生成的 DMRS 提供给检测模块 82。
进一步,第二初始值生成单元 811具体用于根据公式(2)或(3 )或(4)生成 DMRS 对应的伪随机序列的初始值。
其中, 公式 (2) 或公式 (3 ) 或公式 (4) 中的 RNTI可以是 C-RNTI、 SI-RNTI、 P-RNTI RA-RNTI TPC-PUCCH-RNTI或 TPC-PUSCH-RNTI, 但不限于此。
更进一步, 第二初始值生成单元 811具体用于在资源集合所包含的 E-CCE的总个 数大于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数时, 根据公式 (2) 或公式 (3 ), 生成 DMRS对应的伪随机序列的初始值, 而在资源集合所包含的 E-CCE的总个 数小于或等于该资源集合所包含的承载 E-PDCCH的 E-CCE的个数时, 根据公式(4), 生成 DMRS对应的伪随机序列的初始值。
其中, 本实施例的资源集合可以是 PRB、 PRB对、 PRG或 RBG等。
更进一步, 本实施例的第二初始值生成单元 811还可以具体用于在承载 E-PDCCH 的 E-CCE属于公共搜索空间时, 根据公式 (2) 或公式 (3 ) , 生成 DMRS对应的伪随 机序列的初始值, 而在承载 E-PDCCH的 E-CCE属于用户搜索空间时, 根据公式(4), 生成 DMRS对应的伪随机序列的初始值。
上述各功能模块或单元可用于执行上述 UE对 DMRS进行处理的方法流程,其具体 工作原理不再赘述。
本实施例的 UE与本发明实施例提供的基站相配合, 使用在接收到 E-PDCCH之前 可以获知的信息生成解调 E-PDCCH 所需的 DMRS , 解决了使用 SCID 无法生成 E-PDCCH的 DMRS进而无法解调 E-PDCCH的问题, 实现了对 E-PDCCH的解调。
本领域普通技术人员可以理解: 实现上述各方法实施例的全部或部分步骤可以通过 程序指令相关的硬件来完成。 前述的程序可以存储于一计算机可读取存储介质中。 该程 序在执行时,执行包括上述各方法实施例的步骤;而前述的存储介质包括: ROM, RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是: 以上各实施例仅用以说明本发明的技术方案, 而非对其限制; 尽 管参照前述各实施例对本发明进行了详细的说明, 本领域的普通技术人员应当理解: 其 依然可以对前述各实施例所记载的技术方案进行修改, 或者对其中部分或者全部技术特 征进行等同替换; 而这些修改或者替换, 并不使相应技术方案的本质脱离本发明各实施 例技术方案的范围。

Claims

权利要求
1、 一种解调导频信号 DMRS处理方法, 其特征在于, 包括:
基站根据用户设备 UE在接收到所述基站发送的扩展物理下行控制信道 E-PDCCH 之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS;
所述基站将所述 DMRS 映射到下行控制信道区域对应的传输导频的时频资源上发 送给所述 UE。
2、 根据权利要求 1所述的 DMRS处理方法, 其特征在于, 所述基站根据用户设备 UE在接收到所述基站发送的扩展物理下行控制信道 E-PDCCH之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS包括:
所述基站根据所述 UE所在小区的小区标识和 /或无线网络临时标识 RNTI, 生成所 述 DMRS对应的伪随机序列的初始值;
所述基站根据所述伪随机序列的初始值, 生成所述 DMRS。
3、 根据权利要求 2所述的 DMRS处理方法, 其特征在于, 所述基站根据所述 UE 所在小区的小区标识和 /或无线网络临时标识 RNTI,生成所述 DMRS对应的伪随机序列 的初始值包括: 所述基站根据公式 t = L"s/229 + N^,生成所述 DMRS对应的伪随机序列的初始 值; 或者 所述基站根据公式^ ^(^ +^ ί^^ +^'^+^11 , 生成所述 DMRS 对应的 伪随机序列的初始值; 或者 所述基站根据公式 ^ = (^/2+ 1) ' (2^" + 1)' , 生成所述 DMRS对应的 伪随机序列的初始值; 其中, 为所述 DMRS对应的伪随机序列的初始值; 为所述 DMRS对应的发送时隙的序号; 为所述小区标识; "RNTi为所述 RNTI。
4、 根据权利要求 3所述的 DMRS处理方法, 其特征在于, 所述 RNTI为小区无线 网络临时标识 C-RNTI、 系统消息无线网络临时标识 SI-RNTI、 寻呼无线网络临时标识 Ρ-RNT 随机接入无线网络临时标识 RA-RNTI、 发送功率控制物理上行控制信道无线 网络临时标识 TPC-PUCCH-RNTI或发送功率控制物理上行共享信道无线网络临时标识 TPC-PUSCH-RNTI。
5、 根据权利要求 3 所述的 DMRS 处理方法, 其特征在于, 所述基站根据公式 =L"s/2」29 + 或
Figure imgf000019_0001
C« = ( L"s /2 J + 1 ) · (2 ' + 1 ) · 216 + "ΚΝΓΙ ? 生成所述 DMRS对应的伪随机序列的初始值包 括:
如果资源集合所包含的扩展控制信道单元 E-CCE 的总个数大于所述资源集合所包 含的承载所述 E-PDCCH的 E-CCE的个数, 所述基站根据公式^:^ 22 ^1
Cinit = (L"s/2」 +1)· (2iV^ +129 , 生成所述 DMRS对应的伪随机序列的初始值; 如果资源集合所包含的 E-CCE 的总个数小于或等于所述资源集合所包含的承载所 述 E-PDCCH 的 E-CCE 的 个 数 , 所 述 基 站 根 据 公 式
Cinit =(^/2+ 1)'(^1+1)'2ΐ6+"皿 ι, 生成所述 DMRS对应的伪随机序列的初始值; 其中, 所述资源集合是物理资源块 PRB、 物理资源块对 PRB对、 预编码资源块组 PRG或资源块组 RBG。
6、 根据权利要求 3 所述的 DMRS 处理方法, 其特征在于, 所述基站根据公式
=L"s/2」29 + 或
Figure imgf000019_0002
c ini, = ( L"s /2 J + 1 ) · (2 ' + 1 ) · 216 + "ΚΝΓΙ ? 生成所述 DMRS对应的伪随机序列的初始值包 括:
如果承载所述 E-PDCCH的扩展控制信道单元 E-CCE属于公共搜索空间,所述基站 棚公式 ^4"s/2」29 + 或^ =^/2」+1)·(2 +129+ , 生成所述 DMRS 对应的伪随机序列的初始值;
如果承载所述 E-PDCCH 的 E-CCE 属于用户搜索空间, 所述基站根据公式
Cinit =(^/2+ 1)'(^1+1)'2ΐ6+"皿 ι, 生成所述 DMRS对应的伪随机序列的初始值。
7、 根据权利要求 2或 3或 4所述的 DMRS处理方法, 其特征在于, 还包括: 如果不同下行控制信息 DCI格式的 E-PDCCH使用不同伪随机序列的初始值生成所 对应的 DMRS, 所述基站根据所述 E-PDCCH的 DCI格式, 确定所述 E-PDCCH使用的 伪随机序列的初始值; 所述基站根据所述伪随机序列的初始值, 生成所述 DMRS包括:
所述基站根据确定的伪随机序列的初始值, 生成所述 DMRS。
8、 根据权利要求 2或 3或 4所述的 DMRS处理方法, 其特征在于, 还包括: 如果不同聚合级别的 E-PDCCH 使用不同伪随机序列的初始值生成所对应的 DMRS, 所述基站根据所述 E-PDCCH的聚合级别, 确定所述 E-PDCCH使用的伪随机 序列的初始值;
所述基站根据所述伪随机序列的初始值, 生成所述 DMRS包括:
所述基站根据确定的伪随机序列的初始值, 生成所述 DMRS。
9、 根据权利要求 2或 3或 4或 5或 6所述的 DMRS处理方法, 其特征在于, 还包 括:
所述基站根据所述 DMRS 对应的伪随机序列的初始值和预设对应关系, 生成所述 E-PDCCH调度的扩展下行物理共享信道 E-PDSCH的 DMRS对应的伪随机序列的初始 值。
10、 根据权利要求 2或 3或 4或 5或 6所述的 DMRS处理方法, 其特征在于, 所 述基站根据用户设备 UE在接收到所述基站发送的扩展物理下行控制信道 E-PDCCH之 前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS包括:
所述基站按照最大系统带宽, 生成长度为所述最大系统带宽对应的长度的所述 DMRS;
所述基站将所述 DMRS 映射到下行控制信道区域对应的传输导频的时频资源上发 送给所述 UE包括:
所述基站按照所述 DMRS所在的资源位置, 从所述 DMRS中截取相应的序列映射 到所述下行控制信道区域对应的传输导频的时频资源上发送给所述 UE。
11、 根据权利要求 2或 3或 4或 5或 6所述的 DMRS处理方法, 其特征在于, 所 述基站根据用户设备 UE在接收到所述基站发送的扩展物理下行控制信道 E-PDCCH之 前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS包括:
所述基站按照所述 E-PDCCH对应的 DMRS所占的带宽,生成长度为所述 E-PDCCH 对应的 DMRS所占的带宽对应的长度的所述 DMRS;
所述基站将所述 DMRS 映射到下行控制信道区域对应的传输导频的时频资源上发 送给所述 UE包括:
所述基站直接将所述 DMRS 映射到所述下行控制信道区域对应的传输导频的时频 资源上发送给所述 UE。
12、 一种解调导频信号 DMRS处理方法, 其特征在于, 包括:
用户设备 UE使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH之前可以 获知的信息, 生成所述 E-PDCCH对应的 DMRS;
所述 UE根据所述 DMRS对所述 E-PDCCH进行检测。
13、根据权利要求 12所述的 DMRS处理方法,其特征在于,所述 UE根据所述 DMRS 对所述 E-PDCCH进行检测包括:
所述 UE根据所述 DMRS进行信道估计;
所述 UE根据信道估计的结果, 对所述 E-PDCCH进行检测。
14、 根据权利要求 12或 13所述的 DMRS处理方法, 其特征在于, 所述用户设备 UE使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS包括:
所述 UE根据所述 UE所在小区的小区标识和 /或无线网络临时标识 RNTI, 生成所 述 DMRS对应的伪随机序列的初始值;
所述 UE根据所述伪随机序列的初始值, 生成所述 DMRS。
15、根据权利要求 14所述的 DMRS处理方法, 其特征在于, 所述 UE根据所述 UE 所在小区的小区标识和 /或无线网络临时标识 RNTI,生成所述 DMRS对应的伪随机序列 的初始值包括: 所述 UE根据公式 t = L"s/229 + N^,生成所述 DMRS对应的伪随机序列的初始 值; 或者 所述 UE根据公式 e'mt = (L"s/2」 (^η +1)'29 +^",生成所述 DMRS对应的伪 随机序列的初始值; 或者 所述 UE根据公式^ t =(L"s/2+ 1)'(2A^U +1)'2l6 +"皿1, 生成所述 DMRS对应的 伪随机序列的初始值; 其中, 为所述 DMRS对应的伪随机序列的初始值; 为所述 DMRS对应的接收时隙的序号; 为所述小区标识
"RNTI为所述 RNTI。 16、 根据权利要求 15所述的 DMRS处理方法, 其特征在于, 所述 RNTI为小区无 线网络临时标识 C-RNTI、 系统消息无线网络临时标识 SI-RNTI、 寻呼无线网络临时标 识 P-RNTI、 随机接入无线网络临时标识 RA-RNTI、 发送功率控制物理上行控制信道无 线网络临时标识 TPC-PUCCH-RNTI或发送功率控制物理上行共享信道无线网络临时标 识 TPC-PUSCH-RNTI。
17、 根据权利要求 15所述的 DMRS处理方法, 其特征在于, 所述 UE根据公式 =L"s/2」29 + 或
Figure imgf000022_0001
c ini, = ( L"s /2 J + 1 ) · (2 ' + 1 ) · 216 + "ΚΝΓΙ ? 生成所述 DMRS对应的伪随机序列的初始值包 括:
如果所述 UE进行盲检测的结果为资源集合所包含的扩展控制信道单元 E-CCE的总 个数大于所述资源集合所包含的承载所述 E-PDCCH的 E-CCE的个数,所述 UE根据公 式^ =L"s/ + 或^ = (「"8/2」+1)' (2 + 1 ) . 29 + ,生成所述 dmrs对雌 伪随机序列的初始值;
如果所述 UE进行盲检测的结果为资源集合所包含的 E-CCE的总个数小于或等于所 述资源集合所包含的承载所述 E-PDCCH 的 E-CCE 的个数, 所述 UE 根据公式
Cinit = (^/2+ 1) ' (^1 + 1)' 2ΐ6 +"皿 ι, 生成所述 DMRS对应的伪随机序列的初始值; 其中, 所述资源集合是物理资源块 PRB、 物理资源块对 PRB对、 预编码资源块组 PRG或资源块组 RBG。
18、 根据权利要求 15所述的 DMRS处理方法, 其特征在于, 所述 UE根据公式 =L"s/2」29 + 或
Figure imgf000022_0002
c ini, = ( L"s /2 J + 1 ) · (2 ' + 1 ) · 216 + "ΚΝΓΙ ? 生成所述 DMRS对应的伪随机序列的初始值包 括:
如果所述 UE进行盲检测的结果为承载所述 E-PDCCH的扩展控制信道单元 E-CCE 属 于 公 共 搜 索 空 间 , 所 述 UE 根 据 公 式 ^ =L"S/229 + A^ 或 cell 1 9 Λ 7"cell
, 生成所述 DMRS对应的伪随机序列的初始值; 如果所述 UE进行盲检测的结果为承载所述 E-PDCCH的 E-CCE属于用户搜索空间, 所述 UE根据公式 Cirit = ( L"s / + 1 ) · ( 生成所述 DMRS对应的伪随 机序列的初始值。
19、 根据权利要求 12或 13或 15或 16或 17或 18所述的 DMRS处理方法, 其特 征在于, 所述用户设备 UE使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH 之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS包括:
所述 UE 按照最大系统带宽, 生成长度为所述最大系统带宽对应的长度的所述
DMRS;
所述 UE根据所述 DMRS对所述 E-PDCCH进行检测包括:
所述 UE按照所述 DMRS所在的资源位置, 从所述 DMRS中截取相应的序列, 根 据所截取的序列对所述 E-PDCCH进行检测。
20、 根据权利要求 12或 13或 15或 16或 17或 18所述的 DMRS处理方法, 其特 征在于, 所述用户设备 UE使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH 之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS包括:
所述 UE按照所述 E-PDCCH对应的 DMRS所占的带宽,生成长度为所述 E-PDCCH 对应的 DMRS所占的带宽对应的长度的所述 DMRS;
所述 UE根据所述 DMRS对所述 E-PDCCH进行检测包括:
所述 UE直接根据所述 DMRS对所述 E-PDCCH进行检测。
21、 一种基站, 其特征在于, 包括:
第一生成模块, 用于根据用户设备 UE在接收到所述基站发送的扩展物理下行控制 信道 E-PDCCH之前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS;
发送模块, 用于将所述第一生成模块生成的 DMRS 映射到下行控制信道区域对应 的传输导频的时频资源上发送给所述 UE。
22、 根据权利要求 21所述的基站, 其特征在于, 所述第一生成模块包括: 第一初始值生成单元,用于根据所述 UE所在小区的小区标识和 /或无线网络临时标 识 RNTI, 生成所述 DMRS对应的伪随机序列的初始值;
第一导频生成单元,用于根据所述第一初始值生成单元生成的所述伪随机序列的初 始值, 生成所述 DMRS。
23、 根据权利要求 22所述的基站, 其特征在于, 所述第一初始值生成单元具体用 于根据公式 1 = ^8 /229 + ^ 生成所述 DMRS对应的伪随机序列的初始值;或者根 据公式^ ^(^ +^^^^+^'^+^11 , 生成所述 DMRS 对应的伪随机序列的初 始值; 或者根据公式 Cimt =(L"s/2+ 1)'(2A^1 +1)'2l6 生成所述 DMRS对应的伪 随机序列的初始值; 其中, 为所述 DMRS对应的伪随机序列的初始值; 为所述 DMRS对应的发送时隙的序号;
cell
为所述小区标识;
"RNTI为所述 RNTI
24、 根据权利要求 23所述的基站, 其特征在于, 所述 RNTI为小区无线网络临时 标识 C-RNTI、 系统消息无线网络临时标识 SI-RNTI、 寻呼无线网络临时标识 P-RNTI 随机接入无线网络临时标识 RA-RNTI、 发送功率控制物理上行控制信道无线网络临时 标识 TPC-PUCCH-RNTI 或发送功率控制物理上行共享信道无线网络临时标识 TPC-PUSCH-RNTI
25、 根据权利要求 23所述的基站, 其特征在于, 所述第一初始值生成单元更为具 体的用于在资源集合所包含的扩展控制信道单元 E-CCE 的总个数大于所述资源集合所 包含的承载所述 E-PDCCH 的 E-CCE 的个数时, 根据公式^:^ ^^ + ^^或
cell 1 \ 9 7"cell
, 生成所述 DMRS 对应的伪随机序列的初始值; 在资源集合所包含的 E-CCE 的总个数小于或等于所述资源集合所包含的承载所述
E-PDCCH的 E-CCE的个数时, 根据公式^ ' = (L"s/2+ 1) '(2A +1)· 216 生成 所述 DMRS对应的伪随机序列的初始值;
其中, 所述资源集合是物理资源块 PRB、 物理资源块对 PRB对、 预编码资源块组 PRG或资源块组 RBG
26、 根据权利要求 23所述的基站, 其特征在于, 所述第一初始值生成单元更为具 体的用于在承载所述 E-PDCCH的扩展控制信道单元 E-CCE属于公共搜索空间时,根据 公式 ^4"8/2」29 + 或^=^/2+1)'(2 +1)'29+ ,生成所述 DMRS对应 的伪随机序列的初始值; 在承载所述 E-PDCCH的 E-CCE属于用户搜索空间时, 根据公 式^ 1 =(^/2」+ 1)'(2^^+1)'216+" 1,生成所述0 8对应的伪随机序列的初始值。
27、 根据权利要求 22或 23或 24所述的基站, 其特征在于, 还包括:
确定模块,用于在不同下行控制信息 DCI格式的 E-PDCCH使用不同伪随机序列的 初始值生成所对应的 DMRS时,或者在不同聚合级别的 E-PDCCH使用不同伪随机序列 的初始值生成所对应的 DMRS时,根据所述 E-PDCCH的 DCI格式或所述 E-PDCCH的 聚合级别, 确定所述 E-PDCCH使用的伪随机序列的初始值;
所述第一导频生成单元具体用于根据所述确定模块确定的伪随机序列的初始值, 生 成所述 DMRS。
28、 根据权利要求 22或 23或 24或 25或 26所述的基站, 其特征在于, 还包括: 第二生成模块, 用于根据所述 DMRS对应的伪随机序列的初始值和预设对应关系, 生成所述 E-PDCCH调度的扩展下行物理共享信道 E-PDSCH的 DMRS对应的伪随机序 列的初始值。
29、 根据权利要求 22或 23或 24或 25或 26所述的基站, 其特征在于, 所述第一 生成模块具体用于按照最大系统带宽, 生成长度为所述最大系统带宽对应的长度的所述 DMRS;
所述发送模块具体用于按照所述第一生成模块生成的 DMRS 所在的资源位置, 从 所述 DMRS 中截取相应的序列映射到所述下行控制信道区域对应的传输导频的时频资 源上发送给所述 UE。
30、 根据权利要求 22或 23或 24或 25或 26所述的基站, 其特征在于, 所述第一 生成模块具体用于按照所述 E-PDCCH对应的 DMRS 所占的带宽, 生成长度为所述 E-PDCCH对应的 DMRS所占的带宽对应的长度的所述 DMRS;
所述发送模块具体用于直接将所述第一生成模块生成的 DMRS 映射到所述下行控 制信道区域对应的传输导频的时频资源上发送给所述 UE。
31、 一种用户设备 UE, 其特征在于, 包括:
第三生成模块, 用于使用在接收到基站发送的扩展物理下行控制信道 E-PDCCH之 前可以获知的信息, 生成所述 E-PDCCH对应的 DMRS;
检测模块, 用于根据所述第三生成模块生成的 DMRS对所述 E-PDCCH进行检测。 32、 根据权利要求 31所述的 UE, 其特征在于, 所述检测模块包括:
信道估计单元, 用于根据所述第三生成模块生成的 DMRS进行信道估计; 检测单元, 用于根据所述信道估计单元的信道估计结果, 对所述 E-PDCCH进行检 或 32所述的 UE, 其特征在于, 所述第三生成模块包括:
Figure imgf000025_0001
用于根据所述 UE所在小区的小区标识和 /或无线网络临时标 识 RNTI, 生成所述 DMRS对应的伪随机序列的初始值;
第二导频生成单元, 用于根据所述伪随机序列的初始值, 生成所述 DMRS
34、 根据权利要求 33所述的 UE, 其特征在于, 所述第二初始值生成单元具体用于 根据公式 1 =^8/229 + ^ 生成所述 DMRS对应的伪随机序列的初始值;或者根据 公式^ =(L"s/2+1)'(2^n+1)'29+A , 生成所述 DMRs 对应的伪随机序列的初始 值; 或者根据公式 Cimt =(L"s/2+ 1)'(2A^1 +1)'2l6 生成所述 DMRS对应的伪随 机序列的初始值; 其中, 为所述 DMRS对应的伪随机序列的初始值; 为所述 DMRS对应的接收时隙的序号;
ATcel 一
Vro 为所述小区标识
"RNTI为所述 RNTI
35、 根据权利要求 34所述的 UE, 其特征在于, 所述 RNTI为小区无线网络临时标 识 C-RNTI、 系统消息无线网络临时标识 SI-RNTI、 寻呼无线网络临时标识 P-RNTI、 随 机接入无线网络临时标识 RA-RNTI、 发送功率控制物理上行控制信道无线网络临时标 识 TPC-PUCCH-RNTI 或发送功率控制物理上行共享信道无线网络临时标识 TPC-PUSCH-RNTI
36、 根据权利要求 34所述的 UE, 其特征在于, 所述第二初始值生成单元更为具体 的用于在盲检测的结果为资源集合所包含的扩展控制信道单元 E-CCE 的总个数大于所 述资源集合所包含的承载所述 E-PDCCH 的 E-CCE 的个数时, 根据公式 =L"s/2」29 + A ^或^ =(L"s/2」+l)'(2 ^++l\))'.2299 ++WN] l
,生成所述 DMRS对应的伪 随机序列的初始值; 在盲检测的结果为资源集合所包含的 E-CCE 的总个数小于或等于 所述资源集合所包含的承载所述 E-PDCCH 的 E-CCE 的个数时, 根据公式
Cinit =(^/2+ 1)'(^1+1)'2ΐ6+"皿 ι, 生成所述 DMRS对应的伪随机序列的初始值; 其中, 所述资源集合是物理资源块 PRB、 物理资源块对 PRB对、 预编码资源块组 PRG或资源块组 RBG
37、 根据权利要求 34所述的 UE, 其特征在于, 所述第二初始值生成单元更为具体 的用于在盲检测的结果为承载所述 E-PDCCH的扩展控制信道单元 E-CCE属于公共搜索 空间时, 棚公式 ^ =L"s/229 (L"s/2+ 1)' ( +1)'29 + , 生成所 述 DMRS对应的伪随机序列的初始值;在盲检测的结果为承载所述 E-PDCCH的 E-CCE 属于用户搜索空间时,根据公式 Cimt =(L"s /2+ 1)'(2A^1 +1)'2l6 生成所述 DMRS 对应的伪随机序列的初始值。
38、 根据权利要求 31或 32或 34或 35或 36或 37所述的 UE, 其特征在于, 所述 第三生成模块具体用于按照最大系统带宽, 生成长度为所述最大系统带宽对应的长度的 所述 DMRS;
所述检测模块具体用于按照所述 DMRS所在的资源位置, 从所述 DMRS中截取相 应的序列, 根据所截取的序列对所述 E-PDCCH进行检测。
39、 根据权利要求 31或 32或 34或 35或 36或 37所述的 UE, 其特征在于, 所述 第三生成模块具体用于按照所述 E-PDCCH对应的 DMRS所占的带宽,生成长度为所述 E-PDCCH对应的 DMRS所占的带宽对应的长度的所述 DMRS;
所述检测模块具体用于直接根据所述 DMRS对所述 E-PDCCH进行检测。
PCT/CN2013/071266 2012-02-01 2013-02-01 解调导频信号处理方法、基站及用户设备 WO2013113286A1 (zh)

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