WO2011157042A1 - Procédé de transmission à antennes multiples destiné à un signal de référence de sondage, terminal et station de base associés - Google Patents

Procédé de transmission à antennes multiples destiné à un signal de référence de sondage, terminal et station de base associés Download PDF

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Publication number
WO2011157042A1
WO2011157042A1 PCT/CN2010/080437 CN2010080437W WO2011157042A1 WO 2011157042 A1 WO2011157042 A1 WO 2011157042A1 CN 2010080437 W CN2010080437 W CN 2010080437W WO 2011157042 A1 WO2011157042 A1 WO 2011157042A1
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WIPO (PCT)
Prior art keywords
antenna
reference signal
terminal
srs
measurement reference
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PCT/CN2010/080437
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English (en)
Chinese (zh)
Inventor
王瑜新
朱鹏
郝鹏
梁春丽
喻斌
Original Assignee
中兴通讯股份有限公司
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Publication of WO2011157042A1 publication Critical patent/WO2011157042A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • Multi-antenna transmitting method terminal and base station for measuring reference signal
  • the present invention relates to the field of communications, and in particular, to a multi-antenna transmission method, a terminal, and a base station for measuring a Sounding Reference Signal (SRS).
  • SRS Sounding Reference Signal
  • the uplink physical channel of the Long Term Evolution (LTE) system includes a Physical Random Access Channel (PRACH), a Physical Uplink Shared Channel (PUSCH), and a physical uplink. Control channel (Physical uplink control channel, abbreviated as PUCCH).
  • the PUSCH has two different cyclic prefixes (Cyclic Prefix, CP for short), which are Normal Cyclic Prefix (Normal CP) and Extended Cyclic Prefix (Extended Cyclic Prefix).
  • Each sub-frame of a PUSCH consists of two slots (Slots).
  • the Demodulation Reference Signal (DMRS) is different in the sub-frame.
  • FIG. 1 is a schematic diagram of a time domain position of a demodulation reference signal according to the prior art.
  • each subframe includes two DMRS symbols
  • FIG. 1(a) is a schematic diagram of DMRS time domain positions when a normal cyclic prefix is used
  • each subframe contains 14 orthogonal frequency division multiplexing ( The Orthogonal Frequency Division Multiplexing (OFDM) symbol, including the DMRS symbol, the OFDM symbol represents the time domain position of one subframe
  • FIG. 1 (b) is a schematic diagram of the DMRS time domain position when the extended cyclic prefix is used, and each subframe includes 12 time domain OFDM symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a physical downlink control channel (PDCCH) is used to carry uplink and downlink scheduling information, and uplink power control information.
  • the Downlink Control Information (DCI) format is divided into DCI format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, and so on.
  • the base station e-Node-B, referred to as eNB for short
  • UE User Equipment
  • SRS is used to measure wireless channel information between a terminal device and a base station (Channel State) Information, referred to as CSI).
  • CSI Channel State Information
  • the UE sends an uplink SRS on the last data symbol of the transmission subframe according to the bandwidth indicated by the eNB, the frequency domain location, the sequence cyclic shift, the period, and the subframe offset.
  • the eNB determines the uplink CSI of the UE according to the received SRS, and performs operations such as frequency domain selection scheduling, closed loop power control, and the like according to the obtained CSI.
  • the SRS sequence sent by the UE is obtained by cyclically shifting a root sequence » in the time domain. By performing different cyclic shifts on the same root sequence, different SRS sequences can be obtained, and The obtained SRS sequences are mutually orthogonal to each other, and therefore, these SRS sequences can be allocated to different UEs to implement code division multiple access between UEs.
  • Equation (1) can be regarded as dividing the SRS sequence into 8 parts at equal intervals in the time domain, but since the SRS sequence length is a multiple of 12, the minimum length of the SRS sequence is 24.
  • the frequency domain bandwidth of the SRS is configured in a tree structure.
  • Each SRS bandwidth configuration corresponds to a tree structure.
  • the SRS bandwidth of the highest layer (or the first layer) (SRS-Bandwidth) corresponds to the maximum SRS bandwidth of the SRS bandwidth configuration, or SRS bandwidth. range.
  • Tables 1 to 4 show the SRS bandwidth configurations in different uplink SRS bandwidths, where N is the number of resource blocks (RBs) corresponding to the uplink SRS bandwidth.
  • the SRS bandwidth of this layer is 32.
  • FIG. 3 is a schematic diagram of a frequency domain initial position for transmitting SRSs of different UEs allocated by different UEs in the prior art. As shown in FIG.
  • the sequence used by the SRS is selected from the demodulation pilot sequence group.
  • the SRS bandwidth of the UE is 4 Resource Blocks (RBs)
  • RBs Resource Blocks
  • a sequence of CG Computer Generated, referred to as A sequence of CG
  • a Zadoff-Chu sequence of a corresponding length is used.
  • the sub-carriers of the SRS are placed at intervals, that is, the SRS is transmitted using a comb structure, and the number of frequency combs in the LTE system is used. 2, which also corresponds to the time domain repeat coefficient value (Repetition Factor, RPF for short) is 2.
  • RPF Reference Factor
  • multiple UEs may use different cyclic shifts on the same frequency comb, and then send SRS through code division multiplexing, or two UEs may be combed on different frequencies and transmitted by frequency division multiplexing.
  • SRS For example, in an LTE system, a UE that transmits an SRS within a certain SRS bandwidth (4 RBs) can use 8 cyclic shifts and 2 frequency combs that can be used. Therefore, the UE has a total of 16 resources that can be used to transmit SRS, that is, up to 16 SRSs can be simultaneously transmitted within this SRS bandwidth.
  • the UE can only transmit one SRS at each time, so only one SRS resource is required for one UE. Therefore, within the above SRS bandwidth, the system can simultaneously multiplex up to 16 UEs.
  • SU-MIMO single-user multiple input multiple output
  • the LTE-Advanced (LTE-A) system is the next-generation advanced system of the LTE system. It supports SU-MIM0 in the uplink and can use up to four antennas as uplink transmitting antennas. That is to say, the UE can simultaneously transmit SRS on multiple antennas at the same time, and the eNB needs to estimate the state on each channel according to the SRS received on each antenna. However, in some cases, such as Antenna Gain Imbalance (AGI) between the terminal antennas of LTE-A, or when the terminal of LTE-A accesses the LTE network, the terminal can use a single antenna.
  • the transmission mode that is, the terminal transmits SRS using only one antenna at the same time.
  • the terminal of the 4 antenna can select 2 antennas to transmit the SRS, and how to effectively select the antenna to transmit the SRS is a problem to be solved.
  • non-pre-coded (ie antenna-specific) SRS should be used.
  • the UE transmits the non-precoded SRS by using multiple antennas, the SRS resources required by each UE are increased, which causes the number of UEs that can be simultaneously multiplexed in the system to decrease.
  • the UE may also be configured to transmit the SRS by aperiodic transmission by using downlink control information or higher layer signaling.
  • each UE uses 4 antennas to simultaneously transmit SRS, then each UE needs 4 orthogonal resources.
  • the number of UEs that can be multiplexed is reduced to four.
  • the number of users that can be simultaneously multiplexed in the system will be 1/4 of the original LTE.
  • the technical problem to be solved by the present invention is to provide a multi-antenna transmitting method, a terminal and a base station for measuring a reference signal.
  • the present invention provides a multi-antenna transmission method for measuring a reference signal, including:
  • the antenna transmission mode of the terminal or the number of antenna ports that measure the reference signal and transmit the measurement reference signal (SRS) according to the antenna transmission mode or the number of antenna ports that measure the reference signal.
  • SRS measurement reference signal
  • the sending of the measurement reference signal includes:
  • the terminal When the antenna selection is not enabled, the terminal sends a measurement reference signal on a fixed antenna; when the antenna selection is enabled and the terminal supports 4 transmit antennas, the terminal sends the first measurement reference signal on the antenna with the antenna index , wherein the antenna index is determined as follows:
  • the frequency hopping is not enabled.
  • the frequency hopping is enabled.
  • each set of transmit antennas includes at least two transmit antennas, and the terminal needs Select one of the transmit antennas to transmit the measurement reference signal
  • the sending of the measurement reference signal includes:
  • the terminal transmits an nth SRS measurement reference signal on an antenna or an antenna group whose antenna index or group index is, wherein the antenna index or the group index ⁇ (3 ⁇ 4 ⁇ is determined according to the following manner:
  • n SRS n SRS mod 2;
  • the transmitting the measurement reference signal includes: the terminal acquiring the antennas allocated by the base station for transmitting the measurement reference. An orthogonal resource of the signal, the measurement reference signal is transmitted on the orthogonal resources on each antenna.
  • the orthogonal resource is allocated by the base station to each of the resources by a combination of one or more of code division multiplexing (CDM), time division multiplexing (TDM), or frequency division multiplexing (FDM). antenna.
  • Configuring orthogonal code domain resources; allocating orthogonal resources by TDM resource allocation manner includes allocating orthogonal time domain resources by TDM manner; and allocating orthogonal resources by FDM resource allocation manner, including allocating orthogonal frequency domain resources by FDM manner
  • the code domain resource is: a cyclic shift of a root sequence and/or a root sequence; the time domain resource is: a subframe position or a subframe offset; and the frequency domain resource is: a frequency band and/or a frequency comb.
  • the orthogonal resources are allocated to the antennas by using CDM and TDM resource allocation.
  • the orthogonal resources are allocated to the antennas by using a CDM and a FDM resource allocation manner.
  • each set of transmit antennas includes at least two transmit antennas
  • the CDM or FDM resource allocation manner is used to allocate orthogonal resources for transmitting the measurement reference signal to each antenna in the group of transmitting antennas.
  • the terminal directly obtains, by using the high layer signaling or the downlink control signaling, the orthogonal resources used by the antennas to send the measurement reference signal; or the terminal is configured by a high layer signaling or a downlink control signal. And obtaining, in the partial antenna, the orthogonal resources used to send the measurement reference signal, and determining the orthogonal resources used to send the measurement reference signal on each antenna according to the resource allocation manner and the implicit mapping relationship of the configuration.
  • the terminal obtains the resource allocation manner according to the following manner:
  • the determining, by the user terminal, the measurement reference signal period, the resource allocation manner includes:
  • the resource allocation manner of the CDM or the FDM is used, otherwise the TDM is used, or the TDM is combined with the CDM, or the TDM is combined with the FDM resource allocation manner, and the M is 5 to 320.
  • the determining, according to whether the measurement reference signal is frequency hopping in the frequency domain, determining the resource allocation manner includes:
  • the TDM resource allocation mode is used; when the frequency domain hopping is enabled, the CDM or FDM resource allocation mode is used.
  • the cyclic shift (CS) interval of each antenna should be maximized.
  • the CS resources are allocated as follows:
  • n CS (o - n cs j + i - N IT x ) o& N
  • the antenna transmission mode of the terminal refers to a physical uplink shared channel or a physical uplink control channel or an antenna transmission mode of a measurement reference signal, and the terminal determines, by using high layer signaling or downlink control signaling, that the antenna transmission mode is single antenna transmission.
  • the mode is also the multi-antenna transmission mode.
  • the present invention further provides a terminal, wherein: the terminal is configured to: acquire an antenna transmission mode or a number of antenna ports for measuring a reference signal, and perform transmission of a measurement reference signal (SRS) according to an antenna transmission mode.
  • the terminal is configured to: acquire an antenna transmission mode or a number of antenna ports for measuring a reference signal, and perform transmission of a measurement reference signal (SRS) according to an antenna transmission mode.
  • SRS measurement reference signal
  • the terminal is further configured to: when in the single antenna transmission mode or the number of antenna ports for measuring the reference signal is 1:
  • the measurement reference signal is sent on the fixed antenna
  • the first measurement reference signal is transmitted on the antenna with the antenna index, wherein the antenna index ⁇ ) is determined according to the following manner:
  • the SRS does not have frequency hopping in the frequency domain
  • the SRS is enabled in the frequency domain
  • the number of branches corresponding to the 6' layer when the shape structure is allocated ⁇ is the transmission counter of the SRS, and the user-specific SRS bandwidth is 3 ⁇ 4 ⁇ .
  • P is the user-specific frequency hopping bandwidth, and ⁇ is the operation of multiplying multiple numbers.
  • the terminal is configured to: when supporting two transmit antennas and in a single antenna transmission mode, or supporting two sets of transmit antennas, each set of transmit antennas includes at least two transmit antennas, and one of the transmit antennas needs to be selected.
  • the measurement reference signal is sent: Sending an nth SRS measurement reference signal on an antenna or an antenna group with an antenna index or a group index, wherein the antenna index or the group index ⁇ is determined as follows:
  • N b is the SRS bandwidth tree, and the number of branches corresponding to the 6' layer of the other Y[N structure allocation
  • ⁇ is the SRS transmission counter
  • the user-specific SRS bandwidth is 3 ⁇ 4 ⁇
  • P is the user-specific frequency hopping bandwidth
  • ⁇ is the operation of multiplying multiple numbers.
  • the terminal is further configured to: when the number of antenna ports in the multi-antenna transmission mode or the measurement reference signal is 2 or 4, acquire orthogonal resources for transmitting measurement reference signals on each antenna allocated by the base station, A measurement reference signal is transmitted on the orthogonal resources on the antenna.
  • the orthogonal resource is allocated by the base station to each of the resources by a combination of one or more of code division multiplexing (CDM), time division multiplexing (TDM), or frequency division multiplexing (FDM). antenna.
  • CDM code division multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • Configuring orthogonal code domain resources; allocating orthogonal resources by TDM resource allocation manner includes allocating orthogonal time domain resources by TDM manner; and allocating orthogonal resources by FDM resource allocation manner, including allocating orthogonal frequency domain resources by FDM manner
  • the code domain resource is: a cyclic shift of a root sequence and/or a root sequence; the time domain resource is: a subframe position or a subframe offset; and the frequency domain resource is: a frequency band and/or a frequency comb.
  • the terminal is configured to: directly obtain, by using the high layer signaling or the downlink control signaling, the orthogonal resources used to send the measurement reference signal on each antenna; or, from high layer signaling or downlink control Obtaining, in the signaling, the orthogonal resources used to send the measurement reference signal on a part of the antenna, and determining the orthogonal resources used to send the measurement reference signal on each antenna according to the resource allocation manner and the implicit mapping relationship of the configuration. .
  • the terminal is configured to: obtain a resource allocation manner according to the following manner:
  • the terminal is configured to: obtain a resource allocation manner according to the following manner:
  • the resource allocation manner of the CDM or the FDM is used, otherwise the TDM is used, or the TDM is combined with the CDM, or the TDM is combined with the FDM resource allocation manner, and the M is 5 to 320.
  • the terminal is configured to: obtain a resource allocation manner according to the following manner:
  • the TDM resource allocation mode is used; when the frequency domain hopping is enabled, the CDM or FDM resource allocation mode is used.
  • the antenna transmission mode of the terminal refers to a physical uplink shared channel or a physical uplink control channel or an antenna transmission mode of a measurement reference signal, where the terminal is configured to: determine an antenna transmission mode by using high layer signaling or downlink control signaling. Is the single antenna transmission mode or the multi-antenna transmission mode.
  • the present invention further provides a base station, where the base station is configured to: allocate a positive resource allocation method by one or more of code division multiplexing (CDM), time division multiplexing (TDM), or frequency division multiplexing (FDM) And assigning resources to the antennas, so that the antennas transmit measurement reference signals on the orthogonal resources.
  • CDM code division multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the base station is configured to: allocate, for the periodic measurement reference signal, the orthogonal resources to the antennas by using a CDM and a TDM resource allocation manner. Wherein, the base station is set to: for non-periodic measurement reference signals, use CDM combined with FDM
  • the base station is configured to: when the terminal supports two sets of transmit antennas, each set of transmit antennas includes at least two transmit antennas, and the terminal selects one of the transmit antennas to transmit a measurement reference signal, and uses CDM or FDM resources.
  • the allocation method allocates orthogonal resources for transmitting measurement reference signals for each of the set of transmit antennas.
  • the base station is configured to: when the CDM resource allocation mode is used, or the CDM resource allocation mode is combined with other resource allocation modes to allocate orthogonal resources to the antennas, the cyclic shift (CS) interval of each antenna should be maximized. Chemical.
  • the base station is configured to: allocate CS resources as follows:
  • n CS (o -n csj +iN IT x ) o&N
  • j the cyclic shift used by the known antenna port j to transmit the measurement reference signal
  • ⁇ the cyclic shift
  • the terminal transmits the SRS by using the antenna to select the transmission mode, which solves the SRS transmission problem in the single antenna mode or the dual antenna mode in the LTE-A system of the prior art, and proposes a multi-antenna allocation scheme for the SRS resource.
  • the channel measurement performance of the SRS is guaranteed under the premise of saving resource overhead.
  • 1 is a schematic diagram of a time domain position of a prior art demodulation reference signal
  • FIG. 2 is a schematic diagram of a tree structure of SRS bandwidth
  • FIG. 3 is a schematic diagram of a frequency domain initial position of a prior art SRS for transmitting SRSs according to the prior art
  • FIG. 4 is a schematic diagram of a comb structure of a prior art SRS.
  • the present invention provides a multi-antenna transmission method for measuring a reference signal, including:
  • the antenna transmission mode refers to a physical uplink shared channel or a physical uplink control channel or an antenna transmission mode for measuring a reference signal, which may be a single antenna transmission mode or a multi-antenna transmission mode.
  • the terminal determines whether the antenna transmission mode is through high layer signaling or downlink control.
  • the single antenna transmission mode is also the multi-antenna transmission mode. Wherein, when the number of antenna ports in the single antenna transmission mode or the measurement reference signal is 1, an antenna is selected, and the base station can configure one SRS resource to the terminal by using high layer signaling or downlink control signaling, and the terminal is in the selected antenna.
  • the SRS resource on the SRS is sent; the number of antenna ports in the multi-antenna transmission mode or the measurement reference signal is 2 or 4, and the base station allocates orthogonal resources for transmitting measurement reference signals on each antenna, and the terminal acquires each antenna allocated by the base station.
  • An orthogonal resource for transmitting a measurement reference signal, the measurement reference signal is transmitted on the orthogonal resources on each antenna.
  • the following describes further the antenna selection mode in the single antenna transmission mode or when the number of antenna ports for measuring the reference signal is 1, and the allocation method of the orthogonal resources when the number of antenna ports in the multi-antenna transmission mode or the measurement reference signal is 2 or 4. .
  • the present invention provides an antenna selection method for an SRS in a single antenna transmission mode or when the number of antenna ports for measuring a reference signal is 1, including:
  • the terminal transmits an SRS on a fixed antenna
  • N b is the number of branches corresponding to the b layer when the SRS bandwidth tree structure is allocated.
  • n SRS is the transmission counter of the SRS
  • P is the user-specific frequency hopping bandwidth
  • ⁇ is the operation of multiplying multiple numbers.
  • each set of transmit antennas includes at least two transmit antennas, and the terminal needs to select one of the transmit antennas for measurement reference signal transmission, the antenna group index ⁇ % ⁇ is determined according to the following manner:
  • n SRS n SRS mod 2;
  • the antenna index ⁇ (3 ⁇ 4 ⁇ is calculated as:
  • the calculation formula of the antenna index is:
  • N b the number of branches corresponding to the b layer when the SRS bandwidth tree structure is allocated.
  • n SRS is the transmission counter of the SRS
  • P is the user-specific frequency hopping bandwidth
  • ⁇ is the operation of multiplying multiple numbers.
  • the terminal uses only one antenna to transmit the SRS at the same time. Therefore, the terminal only occupies one SRS resource at the same time, and the base station can pass the high-layer signaling or Downlink control signaling configures one SRS resource for the terminal.
  • the SRS resource includes at least one of the following: a cyclic shift of the root sequence and/or the root sequence, a subframe position or subframe offset, a frequency band, and/or a frequency comb.
  • the base station configures a multi-antenna terminal to adopt a single antenna transmission mode or a multi-antenna transmission mode by using high layer signaling or downlink control signaling.
  • the present invention further provides a method for allocating SRS resources in a multi-antenna transmission mode, including:
  • Different antennas are allocated by means of Code Division Multiplexing (CDM), Time-Division Multiplexing (TDM), or Frequency Division Multiplexing (FDM), or any combination of the above.
  • CDM Code Division Multiplexing
  • TDM Time-Division Multiplexing
  • FDM Frequency Division Multiplexing
  • the orthogonal resources are allocated, and each antenna transmits an SRS (referred to as an uplink SRS) on orthogonal resources.
  • the orthogonal resources are allocated to different antennas by using the CDM method, including:
  • the code domain resource is: a cyclic shift of a root sequence and/or a root sequence; the time domain resource is: a subframe position or a subframe offset; the frequency domain resource is: a frequency band and/or a frequency comb.
  • different antennas are allocated by using CDM combined with TDM.
  • orthogonal antennas are allocated for different antennas by means of CDM or FDM.
  • each set of transmit antennas includes at least two transmit antennas, and the terminal selects one of the transmit antennas to transmit a measurement reference signal
  • the CDM or FDM resource allocation mode is the set of transmit antennas.
  • Each of the antennas is allocated an orthogonal resource for transmitting a measurement reference signal. For example, when the terminal can support up to 4 transmit antennas but only 2 of the 4 antennas are selected, the 2 antennas are grouped into two groups, such as antenna 0 and antenna 2, and the antenna 1 and antenna 3 are a group, or any combination, select a group of antennas from two groups to transmit SRS, select the selection method of one transmitting antenna by using the two transmissions described above; pass CDM or FDM
  • the base station notifies the antennas of the terminal equipment (UE) to send the uplink SRS resources through the high layer signaling or the downlink control signaling, and the terminal directly obtains the antennas from the high layer signaling or the downlink control signaling.
  • Send SRS resources Send SRS resources.
  • the resource allocation mode is configured by the base station by using the high layer signaling or the downlink control signaling; or the UE determines the resource allocation manner according to the measurement reference signal period specific to the user terminal, as described in the method 1 Or the UE determines the resource allocation manner according to whether the measurement reference signal is frequency hopping in the frequency domain, as described in the second method.
  • the implicit mapping relationship includes: When the CDM mode is used, the implicit mapping relationship refers to determining the CS of other antennas according to the principle of maximizing the CS interval, or pre-agreed by the base station and the terminal; when the FDM mode is used, such as part of the antenna The first frequency comb is used, and the terminal receives the resource allocation mode indicated by the base station as FDM, then uses the second frequency comb on other antennas, and the like.
  • the SRS resource allocation mode is configured according to the length of the UE-specific SRS period.
  • the resources are configured by CDM or FDM; otherwise, the combination of CDM or TDM is used to combine FDM or TDM. Way to configure resources.
  • M is an integer between 5 and 320 and is a multiple of 5 in milliseconds (ms)
  • the SRS resource allocation mode is configured according to whether the SRS is hopping in the frequency domain.
  • the frequency domain hopping is not enabled (hopping disabled), for example, when b hop ⁇ B SRS , the TDM mode is used; when the frequency domain hopping enabled (hopping enabled), for example, when b ⁇ BsRS , then Use CDM or FDM.
  • the antennas should be made. Maximize CS intervals, such as using the following formula to allocate CS resources:
  • n CS (o -n cs j +iN IT x ) o&N
  • CSJ the cyclic shift used by the transmitting uplink SRS for the known antenna port j
  • W the cyclic shift
  • the base station configures a multi-antenna terminal to adopt a single antenna transmission mode or a multi-antenna transmission mode by using high layer signaling or downlink control signaling.
  • the terminal When the antenna selection is not enabled, the terminal sends an SRS on a fixed antenna; When the antenna selection is enabled,
  • the calculation formula of the antenna index is:
  • the number of branches corresponding to the b layer when the SRS bandwidth tree structure is allocated is the transmission counter of the SRS, which is the user-specific SRS bandwidth.
  • P is the user-specific frequency hopping bandwidth
  • ⁇ is the operation of multiplying multiple numbers.
  • the base station configures a multi-antenna terminal to adopt a single antenna transmission mode or a multi-antenna transmission mode by using high layer signaling or downlink control signaling.
  • the terminal When the antenna selection is not enabled, the terminal sends an SRS on a fixed antenna;
  • the terminal can support up to 4 transmit antennas, use the following methods to transmit antennas:
  • the calculation formula of the antenna index is:
  • N b is the number of branches corresponding to the b layer when the SRS bandwidth tree structure is allocated.
  • n SRS is the transmission counter of the SRS
  • P is the user-specific frequency hopping bandwidth
  • ⁇ is the operation of multiplying multiple numbers.
  • the base station configures the multi-antenna terminal to adopt a single antenna transmission mode or a multi-antenna transmission mode by using high layer signaling or downlink control signaling.
  • Different antennas are allocated orthogonal resources by code division multiplexing (CDM), or time division multiplexing (TDM), or frequency division multiplexing (FDM), or any combination of the above, and each antenna is transmitted on orthogonal resources.
  • CDM code division multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the resource allocation mode is configured by the base station by using high layer signaling or downlink control signaling;
  • the base station notifies the antennas of the terminal equipment (UE) to transmit the uplink SRS resources through the high layer signaling or the downlink control signaling; or the eNB passes the high layer signaling or the downlink control.
  • the signaling and the resource allocation mode of the uplink SRS are sent by the UE, and the UE determines the resources for sending the SRS by each antenna according to the configured implicit mapping relationship.
  • the allocating orthogonal resources to different antennas by using a CDM manner includes: Including FDM
  • the code domain resource is: a cyclic shift of a root sequence and/or a root sequence;
  • the time domain resource is: a subframe position or a subframe offset;
  • the frequency domain resource is: a frequency band and/or a frequency Comb
  • the orthogonal resources are allocated to different antennas by using CDM combined with TDM, or
  • orthogonal antennas are allocated for different antennas by means of CDM or FDM;
  • the terminal can support up to 4 transmit antennas but only 2 of the 4 antennas are selected, the antennas are grouped into two groups, such as antenna 0 and antenna 2, Antenna 1 and antenna 3 are a group, or any combination, and a group of antennas is selected from two groups to transmit SRS, and the selection method of selecting one transmitting antenna by using the two transmissions described above is adopted; the method by CDM or FDM is simultaneous The two antennas transmitting the SRS allocate orthogonal resources.
  • the base station configures a multi-antenna terminal to adopt a single antenna transmission mode or a multi-antenna transmission mode by using high layer signaling or downlink control signaling.
  • the terminal may configure the multi-antenna SRS resource by the following two methods: Method 1: According to the user terminal-specific (The length of the SRS period of the UE-specific is configured to configure the SRS resource allocation mode. When the configuration period is longer than a certain threshold value M, the resources are configured by using CDM or FDM; otherwise, the resources are configured by combining TDM or TDM with CDM or TDM combined with FDM. Where M is an integer between 5 and 320 and is a multiple of 5, The unit is milliseconds (ms).
  • Method 2 Configure the SRS resource allocation mode according to whether the SRS is hopping in the frequency domain.
  • the frequency domain hopping is not enabled (hopping disabled), for example, when b hop ⁇ B SRS , the TDM mode is used; when the frequency domain hopping is enabled (Hopping enabled), for example, when ⁇ ⁇ j8 ⁇ , Then use CDM or FDM.
  • the resource allocation method used includes the CDM mode
  • the CS interval of each antenna should be maximized, for example, the following formula is used to allocate CS resources:
  • c j the known antenna port transmitting uplink SRS cyclic shift used
  • W is the total number of cyclic shifts
  • 2 is the number of antennas simultaneously transmit the SRS
  • i 0X...
  • T x - ⁇ , j 0X... x - ⁇
  • SRS antenna transmission mode
  • the terminal is configured to: when in a single antenna transmission mode:
  • the measurement reference signal is sent on the fixed antenna
  • the first measurement reference signal is transmitted on the antenna with the antenna index, wherein the antenna index ⁇ ) is determined according to the following manner:
  • the SRS does not have frequency hopping in the frequency domain
  • the SRS is enabled in the frequency domain
  • the number of branches corresponding to the 6' layer when the shape structure is allocated which is the transmission counter of the SRS, which is user-specific.
  • SRS bandwidth, . P is the user-specific frequency hopping bandwidth, and ⁇ is the operation of multiplying multiple numbers.
  • the terminal is configured to: when it supports two transmit antennas and is in a single antenna transmission mode, or support two sets of transmit antennas, each set of transmit antennas includes at least two transmit antennas, and one of the transmit antennas needs to be selected.
  • n SRS n SRS mod 2;
  • the other Y[N b , N bhgp is 1, N b , the number of branches corresponding to the 6 ' layer when the SRS bandwidth tree structure is allocated, ⁇ is the transmission counter of the SRS, and the user-specific SRS bandwidth. P is the user-specific frequency hopping bandwidth, and ⁇ is the operation of multiplying multiple numbers.
  • the terminal is configured to: when in a multi-antenna transmission mode, acquire orthogonal resources for transmitting measurement reference signals on each antenna allocated by the base station, and send measurement reference on the orthogonal resources on each antenna. signal.
  • the orthogonal resource is allocated by the base station to each of the resources by a combination of one or more of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM). antenna.
  • CDM code division multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • Configuring orthogonal code domain resources; allocating orthogonal resources by TDM resource allocation manner includes allocating orthogonal time domain resources by TDM manner; and allocating orthogonal resources by FDM resource allocation manner, including allocating orthogonal frequency domain resources by FDM manner
  • the code domain resource is: a cyclic shift of a root sequence and/or a root sequence; the time domain resource is: a subframe position or a subframe offset; and the frequency domain resource is: a frequency band and/or a frequency comb.
  • the terminal is configured to: directly obtain, by using the high layer signaling or the downlink control signaling, the orthogonal resources used to send the measurement reference signal on each antenna; or Determining, in the downlink control signaling, the orthogonal resources used to send the measurement reference signal on a part of the antenna, and determining the positive for transmitting the measurement reference signal on each antenna according to the resource allocation manner and the implicit mapping relationship of the configuration. Hand over resources.
  • the terminal is configured to obtain a resource allocation manner according to the following manner:
  • the terminal is configured to obtain a resource allocation manner according to the following manner:
  • the resource allocation manner of the CDM or the FDM is used, otherwise the TDM is used, or the TDM is combined with the CDM, or the TDM is combined with the FDM resource allocation manner, and the M is 5 to 320.
  • the terminal is configured to obtain a resource allocation manner according to the following manner:
  • the TDM resource allocation mode is used; when the frequency domain hopping is enabled, the CDM or FDM resource allocation mode is used.
  • the antenna transmission mode of the terminal refers to a physical uplink shared channel or a physical uplink control channel or an antenna transmission mode of a measurement reference signal, where the terminal is configured to determine, by using high layer signaling or downlink control signaling, that the antenna transmission mode is
  • the single antenna transmission mode is also the multi-antenna transmission mode.
  • the present invention also provides a base station, where the base station is configured to allocate orthogonality by combining resource allocation modes of one or more of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM). Resources are provided to the antennas such that the antennas transmit measurement reference signals on the orthogonal resources.
  • CDM code division multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the base station is configured to allocate the orthogonal resources to the antennas by using a CDM and a TDM resource allocation manner for the periodic measurement reference signal.
  • the base station is configured to: use a CDM combined with an FDM for a non-periodic measurement reference signal
  • the base station is configured to: when the terminal supports two sets of transmit antennas, each set of transmit antennas includes at least two transmit antennas, and the terminal selects one of the transmit antennas to transmit a measurement reference signal, and uses CDM or FDM resources.
  • the allocation method is for each antenna in the group of transmit antennas to be allocated for transmission An orthogonal resource that measures the reference signal.
  • the base station is configured to: when the CDM resource allocation mode is used, or the CDM resource allocation mode is combined with other resource allocation modes to allocate orthogonal resources to the antennas, the cyclic shift (CS) interval of each antenna should be maximized. Chemical.
  • the base station is configured to: allocate CS resources as follows:
  • n CS (o -n csj +iN IT x ) o&N
  • j the cyclic shift used by the known antenna port j to transmit the measurement reference signal
  • ⁇ the cyclic shift
  • the terminal transmits the SRS in the transmission mode selected by the antenna, and solves the problem of SRS transmission in the single antenna mode or the dual antenna mode in the LTE-A system of the prior art, and proposes a multi-antenna allocation scheme for the SRS resource.
  • the channel measurement performance of the SRS is guaranteed under the premise of saving resource overhead.

Abstract

Un procédé de transmission à antennes multiples destiné à un signal de référence de sondage (SRS) est fourni, et le procédé inclut les étapes consistant à : acquérir le mode de transmission d'antenne du terminal ou la quantité du port d'antenne SRS, transmettre le signal de référence de sondage (SRS) selon le mode de transmission d'antenne du terminal ou la quantité du port d'antenne SRS. Un terminal est également décrit, et le terminal est utilisé pour acquérir le mode de transmission d'antenne du terminal, et transmettre le signal de référence de sondage (SRS) selon le mode de transmission d'antenne du terminal ou la quantité du port d'antenne SRS. Grâce à la présente invention, le problème de la transmission SRS en mode simple antenne ou en mode d'antennes multiples dans le système de technologie d'évolution à long terme avancée (LTE-A) rencontré dans l'art antérieur est résolu ; en même temps, un procédé d'affectation d'antennes multiples destiné à une ressource SRS est proposé, et les performances de mesure de canal du SRS sont garanties tout en économisant le coût lié à la ressource.
PCT/CN2010/080437 2010-06-13 2010-12-29 Procédé de transmission à antennes multiples destiné à un signal de référence de sondage, terminal et station de base associés WO2011157042A1 (fr)

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CN116506094A (zh) * 2023-06-27 2023-07-28 深圳国人无线通信有限公司 5g小基站设备基于多用户的srs资源分配方法和装置

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