WO2011137620A1 - Procédé et système d'indication pour signaux montants de référence de démodulation - Google Patents

Procédé et système d'indication pour signaux montants de référence de démodulation Download PDF

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Publication number
WO2011137620A1
WO2011137620A1 PCT/CN2010/077165 CN2010077165W WO2011137620A1 WO 2011137620 A1 WO2011137620 A1 WO 2011137620A1 CN 2010077165 W CN2010077165 W CN 2010077165W WO 2011137620 A1 WO2011137620 A1 WO 2011137620A1
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Prior art keywords
demodulation reference
reference signal
layer
indication information
user equipment
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PCT/CN2010/077165
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English (en)
Chinese (zh)
Inventor
王瑜新
梁春丽
郝鹏
戴博
喻斌
朱鹏
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中兴通讯股份有限公司
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Publication of WO2011137620A1 publication Critical patent/WO2011137620A1/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
    • H04L5/0091—Signaling for the administration of the divided path
    • 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
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular to a method and system for indicating an uplink demodulation reference signal.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • UE User Equipment
  • PUSCH Physical Uplink Shared Channel
  • the uplink scheduling information (Uplink Scheduling Information) of the PUSCH is sent by the base station to the target UE through a Physical Downlink Control Channel (PDCCH).
  • PDCCH Physical Downlink Control Channel
  • the uplink scheduling information includes: resource allocation, a modulation and coding scheme related to the physical uplink shared channel, and a cyclic shift (Cyclic Shift) of the Demodulation Reference Signal (DMRS).
  • DMRS Demodulation Reference Signal
  • the physical uplink shared channel is transmitted by a single antenna port.
  • a system frame (frame) contains 10 subframes, each of which contains 2 slots.
  • FIG. 1 is a schematic diagram of a cyclic prefix in a time slot according to the related art. As shown in FIG. 1, for a normal cyclic prefix (Normal CP), each time slot is composed of 6 data symbols and 1 demodulation reference signal; for extended cyclic prefix (Extended CP), each time slot consists of 5 data symbols and 1 demodulation reference signal.
  • Normal CP normal cyclic prefix
  • Extended CP extended cyclic prefix
  • the demodulation reference signal DM RS consists of a sequence in the frequency domain which is a cyclic shift of the reference signal sequence.
  • the reference signal sequence of the demodulation reference signal may implement a sequence hopping or a group hopping according to the configuration of the base station, which is also called a time slot.
  • the SGH way to jump. That is, according to the configuration of the base station, the demodulation reference signals of one user equipment in two time slots in one subframe are different, and vary with the time slot in one system frame according to a certain jump pattern.
  • 3 ⁇ 4 ⁇ is configured by the uplink scheduling information.
  • the uplink scheduling information is carried on the physical downlink control channel, with a certain downlink.
  • the Downlink Control Information Format (DCI format) is sent by the base station to the target user equipment.
  • DCI format Downlink Control Information Format
  • the downlink control information format is divided into the following types: DCI format 0, 1, 1A, 1B, 1C, 1D 2, 2A, 3, 3A, etc., wherein the DCI format 0 includes uplink scheduling information, which is used to indicate scheduling of the physical uplink shared channel PUSCH.
  • DCI format 0 indicates that the cyclic shift of the demodulation reference signal for the scheduled PUSCH is as shown in Table 1 below.
  • the LTE-Advanced system (referred to as LTE-A system) is a next-generation evolution system of the LTE system.
  • the physical uplink shared channel can be transmitted by using a single antenna port or by using multiple antenna ports.
  • 2 is a schematic diagram of a baseband signal processing of a transmitting end of a physical uplink shared channel transmitted by a multi-antenna port according to the related art LTE-A system.
  • the LTE-A system supports spatial multiplexing based on one or two codewords (CW), and each codeword corresponds to one transport block (TB).
  • the codewords are further mapped to layers, and each codeword is mapped to one or two layers of data.
  • LTE-A uses a codebook (codebook), which is a precoding technique (Precoding).
  • codebook which is a precoding technique (Precoding).
  • Coding technology is a method of preprocessing the signal at the transmitting end by using Channel Status Information (CSI) to improve multi-antenna system performance.
  • CSI Channel Status Information
  • One way for the transmitter to acquire CSI is through feedback from the receiver.
  • the general method is to save the same codebook at the receiving end and the transmitting end.
  • the receiving end selects a suitable precoding matrix in the codebook according to the current channel condition and sets its index value in the set.
  • Precoding Matrix Index (Precoding Matrix Index, referred to as PMI) is fed back to the transmitting end, and the transmitting end finds the precoding matrix according to the feedback precoding matrix index, and precodes the transmitted signal.
  • the demodulation reference signal (DM RS ) of each layer of data is precoded in the same manner as the data of each layer.
  • Demodulation reference signals for different layer data including demodulation reference signals for multi-layer data of the same user equipment for single-user multiple input multiple output system (SU-MIMO), and multi-user multiple input multiple output system (MU-MIMO)
  • Demodulation reference signals of multi-layer data of a plurality of user equipments are orthogonally used by using different demodulation reference signal cyclic shifts (CS) and/or Orthogonal Cover Codes (OCCs).
  • CS demodulation reference signal cyclic shifts
  • OCCs Orthogonal Cover Codes
  • the orthogonal mask OCC is [+1, +1] and [+1, -1], and acts on the demodulation reference signal on two slots (Slot) in one subframe (Subframe).
  • the base station needs to jointly detect the demodulation reference signals on the two slots in one subframe, thus requiring one user equipment to be two in one subframe.
  • the demodulation reference signal on the time slot must be the same.
  • the SGH mode of slot jump in the LTE system cannot be used.
  • the SGH method of the subframe jump is proposed in the related art.
  • the demodulation reference signals of one user equipment in two slots in one subframe are the same, and the demodulation reference signals on each subframe in a system frame are different, according to a certain The jump pattern changes with the sub-frame within one system frame.
  • the LTE standard version is Release 8 and Release 9
  • the LTE-A standard is Release 10, which is abbreviated as Rel. -8, Rel-9 and Rel-10
  • LTE-A standards may also include subsequent versions; systems and user devices that conform to the corresponding standard versions are called Rel-8 versions of systems and user devices, and Rel-9 versions of systems and User equipment, and Rel-10 version of the system and user equipment.
  • the Rel-10 version of the user equipment can work in the Rel-8/9 version of the system, and the Rel-8/9 version of the user equipment can be in the Rel-10 version of the system. jobs.
  • the Rel-10 version of the user equipment is required to work in the Rel-8/9 version.
  • the cyclic shift of the demodulation reference signal can be correctly configured according to the signaling in the DCI format 0. It should be noted that the current DCI format 0 does not support multi-antenna port transmission.
  • a primary object of the present invention is to provide an indication scheme for an uplink demodulation reference signal to solve at least one of the above problems.
  • a method for indicating an uplink demodulation reference signal comprising: the base station transmitting indication information to the user equipment, the indication information being used to indicate at least one of: a cyclic shift of the demodulation reference signal And a sequence jump/sequence group jump SGH mode of demodulating the reference signal; and the user equipment sends the data and the demodulation reference signal to the base station according to the received indication information.
  • the indication information is carried in a downlink control information format, where the downlink control information format includes a downlink control information format of a physical uplink shared channel for scheduling single antenna port transmission and/or a physical uplink for scheduling multi-antenna port transmission.
  • the base station configures, by using the high layer signaling, whether the orthogonal mask of the demodulation reference signal of the user equipment is enabled; if the base station does not configure the orthogonal mask of the demodulation reference signal of the user equipment, the demodulation of the user equipment The orthogonal mask of the reference signal is disabled by default.
  • the protocol of the user equipment only supports the case where the user equipment uses a single antenna port to transmit on the physical uplink shared channel, or the orthogonal mask of the demodulation reference signal of the user equipment is not enabled at the base station.
  • the indication information is used to indicate a cyclic shift of the demodulation reference signal.
  • the indication information is used to indicate the demodulation reference signal.
  • the cyclic shift and demodulation of the reference signal are orthogonal mask and / or SGH mode.
  • the format of the downlink control information where the indication information is located includes: a downlink control information format DCI format 0.
  • the indication information is used to indicate a cyclic shift of the demodulation reference signal
  • the indication information is used to indicate a cyclic shift of the demodulation reference signal of one layer
  • the cyclic shift of the demodulation reference signal of the layer indicated by the indication information The bits calculate the cyclic shift of the demodulation reference signals of the other layers.
  • the indication information is used to indicate that the orthogonal mask includes at least one of: indicating that the demodulation reference signals of the respective layers use the same orthogonal mask; indicating that the orthogonal mask indexes of the first layer and the second layer are the same, The orthogonal mask indices of Layer 3 and Layer 4 are the same, and the orthogonal mask indices of Layer 3 and Layer 4 are different from the orthogonal mask indices of Layer 1 and Layer 2; indicating Layer 1 and The orthogonal mask index of the third layer is the same, the orthogonal mask indexes of the second layer and the fourth layer are the same, and the orthogonal mask indexes of the second layer and the fourth layer are different from those of the first layer and the third layer. Orthogonal mask index.
  • the indication information is used to indicate the orthogonal mask, where the indication information indicates demodulation of each layer, where the downlink control information format where the indication information is located is used to schedule the user equipment to send the spatial multiplexing layer number less than or equal to two.
  • the reference signal uses the same orthogonal mask.
  • the indication information is used to indicate the orthogonal mask, where: the downlink control information format where the indication information is used is used to schedule the user equipment to send the spatial multiplexing layer number to be greater than two, and the SGH mode indicated by the indication information is a sub When the frame is jumped, the indication information indicates that the demodulation reference signals of the respective layers use the same orthogonal mask.
  • the range of the cyclic shift value of the demodulation reference signal indicated by the indication information is: 0, 2. 3, 4, 6, 8, 9, 10.
  • the SGH mode includes one of the following: slot mega-transition, sub-frame mega-transition. Further, whether the SGH is enabled by the high layer signaling, or the SGH is configured by the high layer signaling, or the SGH is enabled and the SGH mode is jointly configured by the high layer signaling. Further, the indication information is 3-bit signaling.
  • an indication system for an uplink demodulation reference signal including: a base station and a user equipment, where the base station is configured to send indication information to the user equipment, where the indication information is used to indicate at least one of the following: The cyclic shift of the reference signal, the orthogonal mask of the demodulation reference signal, and the sequence jump/sequence group jump SGH mode of the demodulation reference signal; the user equipment is configured to send data to the base station according to the received indication information.
  • the base station is further configured to carry the indication information in a downlink control information format, where the downlink control information format includes a downlink control information format for scheduling a physical uplink shared channel for single antenna port transmission, and/or for scheduling multiple antennas.
  • the base station transmits indication information to the user equipment, the indication information being used to indicate at least one of: cyclic shift of the demodulation reference signal, orthogonal mask of the demodulation reference signal, and sequence of the demodulation reference signal
  • the jump/sequence group jumps to the SGH mode; the user equipment performs uplink transmission according to the received indication information.
  • FIG. 1 is a schematic diagram of a cyclic prefix in a time slot according to the related art
  • FIG. 2 is a baseband of a transmitting end of a physical uplink shared channel transmitted by a multi-antenna port in an LTE-A system according to the related art
  • 3 is a schematic diagram of precoding of an LTE-A system according to the related art
  • FIG. 4 is a flowchart of a method for indicating an uplink demodulation reference signal according to an embodiment of the present invention.
  • the newly added downlink control information format may be referred to as DCI format X; or may be extended signaling by using an existing signaling type.
  • FIG. 4 is a flowchart of a method for indicating an uplink demodulation reference signal according to an embodiment of the present invention.
  • Step S402 The base station sends indication information to a user equipment, where the indication information is used to indicate at least one of the following: : a cyclic shift of the demodulation reference signal, an orthogonal mask of the demodulation reference signal, and a sequence jump/sequence group jump SGH mode of the demodulation reference signal;
  • Step S404 the user equipment according to the received indication information
  • the base station transmits data and demodulates the reference signal.
  • the base station since the base station has the ability to identify the protocol version of the user equipment and select an indication according to the protocol version, forward or backward compatibility can be achieved relatively easily.
  • the foregoing indication information is carried in a downlink control information format, where the downlink control information format includes a downlink control information format for scheduling a physical uplink shared channel for single antenna port transmission, and/or for scheduling multi-antenna port transmission.
  • the downlink control information format of the physical uplink shared channel Preferably, when the protocol of the user equipment only supports the user equipment to use the single antenna port transmission on the physical uplink shared channel, or the base station configures the orthogonal mask of the demodulation reference signal of the user equipment to be disabled.
  • the indication information is used to indicate a cyclic shift of the demodulation reference signal.
  • the indication information is used to indicate cyclic shift and demodulation of the demodulation reference signal.
  • the SGH can be configured by the higher layer signaling, or the SGH is configured by the high layer signaling, or the SGH is enabled and the SGH mode is configured by the high layer signaling.
  • the indication information is 3-bit (bit) signaling.
  • the 3-bit signaling and the protocol supported by the user equipment are divided into Rel-10 and its subsequent versions and Release-8/9.
  • 3 bits signaling used for the user equipment of Rel-10 and its subsequent versions to jointly indicate the CS, OCC and sequence/group hopping (SGH) modes of the demodulation reference signal; also used for the Rel-8/9 version
  • the user equipment indicates the CS of the demodulation reference signal.
  • the 3 bits signaling is included in a downlink control information format (DCI format).
  • the downlink control information format is sent by the base station to the target user equipment through the physical downlink control channel.
  • the SGH mode includes a SGH mode of slot hopping and subframe hopping.
  • the sequence hopping and the group hopping are enabled by the high layer signaling; when the SGH mode is configured as a subframe hopping In the case of transition, the enabling and jumping mode of the subframe hopping is configured by the high layer signaling; preferably, the value of the 3bits signaling is in the range of ⁇ 000, 001, 010, 011, 100, 101, 110, 111 ⁇ set.
  • the 3bits signaling is used to indicate the CS of the demodulation reference signal of the Rel-8/9 version of the user equipment as shown in Table 1: Table 1
  • the 3bits signaling can be included in DCI format 0.
  • the 3 bits signaling is used for the CS, OCC, and SGH modes of the demodulation reference signal jointly indicated by the user equipment of Rel-10 and subsequent versions.
  • the following are the configuration of CS, OCC and SGH The methods are explained separately.
  • Configure CS When the downlink control information format is scheduled to be sent by the target user equipment to the PUSCH transmitted by the single-antenna port, the 3 bits signaling indicates “ ⁇ s , as shown in Table 1 , and details are not described herein again.
  • the 3 bits are used to indicate a cyclic shift of the demodulation reference signal of one layer; the demodulation reference signal of the layer indicated by the 3bits signaling
  • the cyclic shift calculates the cyclic shift of the demodulation reference signals of the other layers.
  • the method of indicating and calculating is exemplified below.
  • the 3bits signaling indicates "g ⁇ s ( , where ( is the cyclic shift of the demodulation reference signal of the d-th layer data, 0 ⁇ ⁇ / ⁇ ⁇ _1. Then the cyclic shift of the demodulation reference signal of the layer 1 data) for
  • ⁇ ⁇ is the inter-layer cyclic shift difference of the demodulation reference signal, or cyclic shift offset.
  • the 3bits signaling indicates 3 ⁇ 4R S (0), where (0) is a cyclic shift of the demodulation reference signal of the layer 0 data. Bit.
  • the inter-layer cyclic shift difference ⁇ ⁇ of the demodulation reference signal is determined by the number of spatial multiplexing layers of the PUSCH. Table 2 below is an example of this. Table 2
  • the SGH mode indicating the demodulation reference signal is a slot jump; when the value of the 3bits signaling belongs to the complement of the true subset, the solution is indicated
  • the SGH mode of the reference signal is a sub-frame jump.
  • the 3bits signaling ⁇ value range is ⁇ 000, 001, 010, 011, 100, 101, 110, 111 ⁇ , when the value of the 3bits signaling belongs to ⁇ 000, 001, 010, 011 ⁇ , the SGH mode indicating the demodulation reference signal is a slot jump; when the value of the 3 bits signaling belongs to ⁇ 100, 101, 110, 111 ⁇ , indicating that the SGH mode of the demodulation reference signal is a subframe jump .
  • the SGH mode indicating the demodulation reference signal is Time slot megatransition; when the value of the 3bits signaling belongs to ⁇ 011, 100, 101 ⁇ , the SGH mode indicating the demodulation reference signal is a subframe hop.
  • the foregoing configuration mode is only used when the downlink control information format scheduling target user equipment sends the PUSCH transmitted by the multi-antenna port, and when the downlink control information format scheduling target user equipment sends the PUSCH transmitted by the single antenna port, the demodulation reference signal is demodulated.
  • the SGH mode does not use the subframe jump, and the 3 bit signaling is not used to configure the SGH mode.
  • Configuring the OCC The base station configures, by using the high layer signaling, whether the orthogonal mask of the demodulation reference signal of the user equipment is enabled; if the base station does not configure the orthogonal mask of the demodulation reference signal of the user equipment, the user The orthogonal mask of the demodulation reference signal of the device is disabled by default. For example, the user equipment first determines whether the OCC enable/disable signaling from the base station is received.
  • the user equipment does not use the OCC for the uplink demodulation reference signal; if the signaling is received, The user equipment continues to determine whether the OCC indicated by the signaling is enabled. When the OCC indicated by the signaling is not enabled, the user equipment does not use the OCC for the uplink demodulation reference signal. When the OCC indicated by the signaling is enabled, the user equipment The OCC is used for the uplink demodulation reference signal.
  • the indication information is used to indicate the cyclic shift of the demodulation reference signal and the orthogonal mask of the demodulation reference signal, and all states indicated by the indication information include one or more of the following:
  • the demodulation reference signals of the layers use the same orthogonal mask, that is, the orthogonal mask index of each layer is the same as the orthogonal mask index of the first layer;
  • the indication information is used to indicate the cyclic shift of the demodulation reference signal and the orthogonal mask and the SGH mode of the demodulation reference signal.
  • the 3 bits signaling indicates that the SGH mode of the demodulation reference signal is a subframe jump: each layer The demodulation reference signal of the data uses the same OCC.
  • the 3 bits signaling indicates that the SGH mode of the demodulation reference signal is a time slot hopping: when the downlink control information format scheduling target user equipment transmits the PUSCH transmitted by the multi-antenna port with the spatial multiplexing layer ⁇ ⁇ 2, the data of each layer The demodulation reference signal uses the same OCC;
  • the 3 bits signaling indicates the OCC; when the downlink control information format schedules the target user equipment to transmit the PUSCH transmitted by the multi-antenna port with the spatial multiplexing layer ⁇ > 2, the demodulation reference signals of the respective layers of data use different OCCs. For example, when the downlink control information format scheduling target user equipment transmits a PUSCH transmitted by a multi-antenna port with a spatial multiplexing layer number v>2, and the 3 bits signaling indicates that the SGH mode of the demodulation reference signal is a time slot jump, each layer The demodulation reference signals for the data use different OCCs.
  • each The demodulation reference signals of the layer data use the same OCC.
  • the 3 bits signaling and the spatial multiplexing layer ⁇ and the layer sequence number 1 jointly indicate the OCC used by the demodulation reference signal of the corresponding layer data.
  • the downlink control information format schedules the target user equipment to transmit the single antenna port transmission
  • the demodulation reference signal does not use OCC, and the 3bits signaling is not used to configure the OCC.
  • the downlink control information format schedules the target user equipment to transmit the single antenna port transmission
  • the demodulation reference signal uses OCC
  • the downlink control information format of the PUSCH transmitted by the scheduling target user equipment for transmitting the single antenna port includes DCI format 0.
  • an indication system for demodulating a reference signal including: a base station and a user equipment, where: the base station is configured to send indication information to the user equipment, where the indication information is used to indicate at least one of the following: The cyclic shift of the reference signal, the orthogonal mask of the demodulation reference signal, and the sequence jump/sequence group jump SGH mode of the demodulation reference signal; the user equipment is configured to send data to the base station according to the received indication information. Demodulate the reference signal.
  • the base station is further configured to carry the indication information in a downlink control information format, where the downlink control information format includes a downlink control information format for scheduling a physical uplink shared channel for single antenna port transmission, and/or for scheduling multiple antennas.
  • the downlink control information format of the physical uplink shared channel transmitted by the port Modifications of the above various embodiments will be described below.
  • the SGH method of Table 8 among the eight states indicated by the 3bits signaling, there are n states in which the SGH mode is a time slot mega-transition, and there are 8-n kinds of ⁇ !
  • the SGH mode of the state is a sub-frame mega-transition, and ⁇ is an integer between 0 and 8.
  • the inter-layer cyclic shift difference ⁇ 6
  • the 3bits signaling is shown in Table 9: Table 9
  • Manner 2 Use a uniform representation for different spatial multiplexing layers.
  • the following table shows the cyclic shift used by the layer indicated by the cyclic shift domain in the downlink control signaling. [w ( (0) indicates the layer The orthogonal mask used.
  • the above embodiment of the present invention solves the problem that the indication method in the related art cannot be satisfied.
  • the requirement of uplink multi-antenna port transmission can further indicate the parameters of the demodulation reference signal to meet the requirements of uplink multi-antenna port transmission.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they 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.

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Abstract

La présente invention décrit un procédé d'indication et un système d'indication pour des signaux montants de référence de démodulation. Le procédé comprend les étapes suivantes : une station de base transmet des informations d'indication à un équipement utilisateur ; les informations d'indication sont utilisées pour indiquer au moins l'un des éléments suivants : les changements cycliques des signaux de référence de démodulation, les masques orthogonaux des signaux de référence de démodulation, et les modes de saut de séquences/saut de groupes de séquences des signaux de référence de démodulation ; l'équipement utilisateur transmet des données et les signaux de référence de démodulation de la station de base selon les informations d'indication reçues. La présente invention peut indiquer les paramètres des signaux de référence de démodulation pour répondre aux exigences de la transmission montante de ports multi-antennes.
PCT/CN2010/077165 2010-05-06 2010-09-20 Procédé et système d'indication pour signaux montants de référence de démodulation WO2011137620A1 (fr)

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