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WO2011095009A1 - Procédé et système de transmission de signaux de référence de sondage - Google Patents

Procédé et système de transmission de signaux de référence de sondage Download PDF

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Publication number
WO2011095009A1
WO2011095009A1 PCT/CN2010/077040 CN2010077040W WO2011095009A1 WO 2011095009 A1 WO2011095009 A1 WO 2011095009A1 CN 2010077040 W CN2010077040 W CN 2010077040W WO 2011095009 A1 WO2011095009 A1 WO 2011095009A1
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WO
WIPO (PCT)
Prior art keywords
reference signal
measurement reference
terminal
indication information
srs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2010/077040
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English (en)
Chinese (zh)
Inventor
王瑜新
戴博
郝鹏
梁春丽
喻斌
朱鹏
张禹强
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ZTE Corp
Original Assignee
ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2011095009A1 publication Critical patent/WO2011095009A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for transmitting a Sounding Reference Signal (SRS).
  • the uplink physical channel of the Long Term Evolution (LTE) system includes a Physical Random Access Channel (PRACH), and a Physical Uplink Shared Channel (PUSCH). Physical Uplink Control Channel (PUCCH for short).
  • PUSCH has two different Cyclic Prefix (CP) lengths, which are Normal Cyclic Prefix (Normal CP) and Extended Cyclic Prefix (Extended Cyclic Prefix).
  • CP Cyclic Prefix
  • Each sub-frame of a PUSCH consists of two slots (Slots). For different cyclic prefix lengths, the position of the Demodulation Reference Signal (DMRS) in the subframe will not be located.
  • DMRS Demodulation Reference Signal
  • FIG. 1 is a schematic diagram of a time domain position of a demodulation reference signal according to the prior art.
  • each subframe contains two DMRS symbols
  • FIG. 1(a) is a schematic diagram of the DMRS time domain position when a normal cyclic prefix is used
  • each subframe contains 14 orthogonal frequency division multiplexing ( Orthogonal Frequency Division Multiplexing (OFDM) symbol, including DMRS symbol, OFDM symbol represents the time domain position of one subframe
  • OFDM Orthogonal Frequency Division Multiplexing
  • Figure 1 (b) is a schematic diagram of i or position of DMRS when using extended cyclic prefix, each subframe Contains 12 or OFDM symbols.
  • the physical downlink control channel PDCCH is used for 7-load uplink and downlink scheduling information, and uplink power control information.
  • the Downlink Control Information (DCI) format is divided into DCI formats 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
  • may configure a terminal device User Equipment, UE for short
  • the terminal device accepts a higher layer configuration, which is also configured by high layer signaling.
  • UE User Equipment
  • SRS is a signal used between a terminal device and a base station to measure Channel State Information (CSI).
  • CSI Channel State Information
  • the UE is instructed by the eNB. Parameters such as bandwidth, frequency domain position, sequence cyclic shift, period and subframe offset, and timing send the uplink SRS on the last data symbol of the transmission subframe.
  • 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 transmitted by the UE is obtained by cyclically shifting a root sequence v (") in the time domain.
  • Equation (1) where n Rs is indicated by 3 bit signaling, which are 0, 1, 2, 3, 4, 5, 6, and 7, respectively. That is to say, in the same time-frequency resource, the UE in the cell has 8 available code resources, and the eNB can configure up to 8 UEs to simultaneously send the SRS on the same time-frequency resource. Equation (1) can be considered 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. In the LTE system, 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) corresponds to the maximum SRS bandwidth of the SRS bandwidth configuration, or SRS bandwidth. range.
  • the UE After calculating the SRS bandwidth of the base station according to the signaling indication of the base station, the UE determines the initial frequency domain position of the SRS to be sent according to the frequency domain location of the upper layer signaling sent by the eNB.
  • 2 is a schematic diagram of a frequency domain initial position for transmitting a SRS by a UE that allocates different Wrrcs according to the prior art. As shown in FIG.
  • the sequence used by the SRS is selected from the demodulation pilot sequence group, and the SRS bandwidth of the UE is 4
  • a resource block abbreviated as RB
  • a computer generated (Computer Generated) sequence is used; when the SRS bandwidth of the UE is greater than 4 RBs, 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 in a comb structure, and the number of frequency combs in the LTE system is 2 , also corresponds to the time domain repeat coefficient value (Repetition Factor, abbreviated as RPF) is 2.
  • RPF time domain repeat coefficient value
  • FIG. 3 is a schematic diagram of a comb structure of a prior art SRS.
  • each UE transmits an SRS
  • the UE transmits the SRS using only subcarriers whose frequency domain index is even or odd according to the indication of the upper layer signaling of 1 bit.
  • This comb structure allows more UEs to transmit SRS within the same SRS bandwidth.
  • multiple UEs can use different cyclic shifts on the same frequency, and then send SRS through code division multiplexing, or two UEs can be combed on different frequencies, through frequency division multiplexing.
  • Send SRS is a schematic diagram of a comb structure of a prior art SRS.
  • 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, so the UE has a total of 16 A resource that can be used to send SRS, that is, up to 16 SRSs can be sent simultaneously within this SRS bandwidth.
  • the Single User Multiple Input Multiple Output (SU-MI MO) is not supported in the LTE system, the UE can only send one SRS at each time, so only one UE needs one. SRS resources, therefore, within the above SRS bandwidth, the system can simultaneously multiplex up to 16 UEs.
  • the LTE-Advanced (LTE-Advanced) system is a next-generation evolution system of the LTE system, supports SU-MIMO in the uplink, and can use up to four antennas as uplink transmitting antennas. That is, 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.
  • non-pre-coded (ie antenna-specific) SRS should be used.
  • the UE when 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 by using downlink control information or higher layer signaling. For example, within a certain SRS bandwidth (4 RBs), if each UE transmits SRS using 4 antennas, then the number of resources required for each UE is 4. According to the above, the total number of SRS resources that can be supported in one SRS bandwidth is 16, so that it can be reused within this SRS bandwidth. The number of UEs is reduced to four.
  • a primary object of the present invention is to provide a transmission scheme for measuring a reference signal to at least solve the above problems.
  • a method for transmitting a measurement reference signal including the steps of: receiving, by a terminal, indication information sent by a base station; and performing, by the terminal, two orthogonal frequency division multiplexing in one subframe indicated by the indication information
  • the first measurement reference signal and the second measurement reference signal are simultaneously transmitted to the base station on the OFDM symbol.
  • the two OFDM symbols are two uplink demodulation reference signal symbols of the subframe.
  • the method further includes: the terminal transmitting the third measurement reference signal on the last OFDM symbol of the subframe indicated by the indication information while transmitting the first measurement reference signal and the second measurement reference signal.
  • the method further includes: when the periodic measurement reference signal and the aperiodic measurement reference signal are configured to be transmitted in the same subframe, the terminal only sends the aperiodic measurement reference signal, or the terminal simultaneously transmits the periodic measurement.
  • Reference signal and aperiodic measurement reference signal Preferably, the first measurement reference signal and the second measurement reference signal are code-multiplexed with two orthogonal demodulation reference signals of the terminal or other terminal by using an orthogonal mask, or with the terminal or other terminal Subframes Two OFDM symbols in other OFDM symbols are code division multiplexed with an orthogonal mask.
  • the orthogonal mask is: [+1, +1] or [+1, -1].
  • the base station indicates, by signaling, an orthogonal mask used by the first measurement reference signal and the second measurement reference signal of the terminal.
  • the frequency domain transmission position of the first measurement reference signal and the second measurement reference signal is the same as the reference signal sequence used.
  • the transmission bandwidth of the first measurement reference signal and the second measurement reference signal, the cyclic displacement value used, and the frequency are the same.
  • the first measurement reference signal and the second measurement reference signal are capable of using a cyclic shift value of 8, 12 or 16.
  • the number of frequency combs that can be used by the first measurement reference signal and the second measurement reference signal is two, three or four.
  • the method before the terminal receives the indication information sent by the base station, the method further includes: the base station configuring the terminal to send the time domain location of the measurement reference signal, and sending the indication information to the terminal, where the time domain location is two orthogonal frequencies of the subframe The last OFDM symbol of the OFDM symbol and/or subframe is divided and multiplexed.
  • the indication information is indicated by downlink control information or higher layer signaling.
  • a transmission system for measuring a reference signal including a base station and a terminal, where the base station includes: a first sending module, configured to send indication information to the terminal, where the indication information is used to indicate that the terminal sends Measure a time domain position of the reference signal; the terminal includes: a receiving module, configured to receive the indication information; and a second sending module, configured to respectively perform two orthogonal frequency division multiplexing OFDM symbols in one subframe indicated by the indication information
  • the base station simultaneously transmits the first measurement reference signal and the second measurement reference signal.
  • the base station further includes: a configuration module, configured to configure a time domain location at which the terminal sends the measurement reference signal.
  • the configuration module is configured to configure a time domain location where the two uplink demodulation reference signal symbols of the subframe are located, where the terminal sends the time domain location of the first measurement reference signal and the second measurement reference signal, where the indication information is used to indicate Whether to transmit the measurement reference signal in the time domain position where the two uplink demodulation reference signal symbols of the subframe are located, or the indication information is used to indicate the time domain position where the two uplink demodulation reference signal symbols are located.
  • the second sending module is further configured to send the third measurement reference signal on the last OFDM symbol of the subframe indicated by the indication information while transmitting the first measurement reference signal and the second measurement reference signal.
  • the terminal respectively transmits the first measurement reference signal and the second measurement reference signal to the base station simultaneously on the OFDM symbols in the two time domains in one subframe indicated by the indication information sent by the base station, thereby solving the present situation.
  • the problem of a decrease in the number of users when multiple antennas transmit SRS increases the number of SRS resources available in the LTE-A system, and increases the number of users that can be accommodated in the LTE-A system.
  • FIG. 1 is a schematic diagram of a time domain position of a demodulation reference signal in the prior art
  • FIG. 2 is a schematic diagram of a frequency domain initial position of a prior art UE transmitting SRSs with different "e"
  • FIG. 4 is a block diagram showing a structure of a transmitting system of an SRS according to an embodiment of the present invention
  • FIG. 5 is a block diagram showing a preferred structure of a transmitting system of an SRS according to an embodiment of the present invention
  • FIG. 7 is a flowchart 1 of a method for transmitting a preferred SRS according to an embodiment of the present invention
  • FIG. 8 is a preferred embodiment of the present invention.
  • a SRS transmission system including a base station and a terminal.
  • Figure 4 is a structural block diagram of a SRS transmission system according to an embodiment of the present invention.
  • the base station includes: a first sending module 44
  • the terminal includes: receiving Module 46, second transmitting module 48, the system will be described in detail below.
  • the base station includes: a first sending module 44, configured to send the indication information to the terminal, where the indication information is indicated by the downlink control information or the high layer signaling, where the indication information is used to indicate the time domain location of the SRS sent by the terminal.
  • the terminal includes: a receiving module 46, configured to receive the indication information; the second sending module 48 is coupled to the receiving module 46, where the module is configured to respectively perform two orthogonal frequency division multiplexing OFDM symbols in one subframe indicated by the indication information Up, the first SRS (Measurement Reference Signal 1) and the second SRS (Measurement Reference Signal 2) are simultaneously transmitted to the base station.
  • FIG. 5 is a block diagram of a preferred structure of a SRS transmission system according to an embodiment of the present invention. As shown in FIG. 5, the base station further includes a configuration module 42 configured to configure a time domain location in which the terminal transmits the SRS.
  • the configuration module 42 can configure whether the matching terminal sends the measurement reference signal in a time domain position where two uplink demodulation reference signal symbols of one subframe are located.
  • the indication information may directly indicate the time domain position where the two uplink demodulation reference signal symbols are located, or may also indicate whether to transmit the measurement reference signal in the time domain position where the two uplink demodulation reference signal symbols are located.
  • the second sending module 48 is further configured to send the third SRS in a time domain location where the last data symbol of the subframe indicated by the indication information is located while transmitting the first SRS and the second SRS.
  • a method for transmitting an SRS is provided corresponding to the foregoing system, and FIG.
  • FIG. 6 is a flowchart of a method for transmitting an SRS according to an embodiment of the present invention.
  • the process includes The following steps are as follows: Step S602: The terminal receives the indication information sent by the base station. Step S604: The terminal separately sends the first measurement reference signal and the second measurement reference signal to the base station on the two OFDM symbols in one subframe indicated by the indication information. Through the above system and steps S602 to S604, the number of measurement reference signal resources in the LTE-A system is effectively increased.
  • FIG. 7 is a flowchart 1 of a method for transmitting a preferred SRS according to an embodiment of the present invention. As shown in FIG.
  • Step S702 A terminal receives indication information (for example, signaling) sent by a base station. [Instruction); Step S704, the terminal respectively demodulates the two uplink demodulation references in one subframe indicated by the indication information At the time domain location where the signal symbol is located, the first SRS and the second SRS are simultaneously transmitted to the base station.
  • the flow in FIG. 8 can also be used.
  • FIG. 8 is a flowchart of a preferred SRS sending method according to an embodiment of the present invention, as shown in FIG. The difference from the flowchart of FIG. 7 and FIG.
  • step S804 the terminal sends the third SRS on the last OFDM symbol of the subframe indicated by the indication information while transmitting the first SRS and the second SRS.
  • the base station may configure the terminal to send the time domain location of the measurement reference signal, where the time domain location may be the last symbol of the subframe and/or two OFDM symbols of the subframe (for example, The time domain location where the two DMRS symbols are located.
  • the reference signal 1 and the measurement reference signal 2 are measured with two of the terminal or other terminal
  • the DMRS symbol is code division multiplexed with an orthogonal mask.
  • the orthogonal mask used may be [+1, +1] or [+1, -1].
  • the orthogonal mask used to measure the reference signal 1 and the measurement reference signal 2 is [+1, -1]; or, the orthogonal mask used by the measurement reference signal 1 and the measurement reference signal 2 is indicated by signaling.
  • the frequency domain transmission position of the measurement reference signal 1 and the measurement reference signal 2 is the same as the reference signal sequence used.
  • the transmission bandwidth of the measurement reference signal 1 and the measurement reference signal 2, the cyclic shift value used, and the frequency comb are the same.
  • the measurement reference signal 1 and the measurement reference signal 2 can be used with 8 cyclic shifts.
  • the terminal may only transmit the aperiodic measurement reference signal, or the terminal may simultaneously transmit the periodic measurement reference.
  • Signal and aperiodic measurement reference signals are configured to be transmitted in the same subframe.
  • the base station sends control information to the UE to instruct the UE to send the SRS.
  • the control information may be downlink control information and/or high layer signaling, including: when sending the SRS
  • the time domain location indication information of the SRS may be 1 bit, 2 bits, or 3 bits, and is used to indicate a time domain location where the UE sends the SRS, where the time domain location is a time domain location where the two uplink DMRS symbols are located;
  • the bit index value is 3 bits or 4 bits, which is used to indicate the cyclic shift used by the UE when sending the SRS, and may be 8, 12 or 16;
  • the RPF value is 1 bit or 2 bits, and the value may be 2 or 3 or 4;
  • the frequency comb position used by the UE uses 1 bit or 2 bits, and the corresponding value ranges from 0 to 1 or 0 to 3, respectively.
  • the signaling indication of the base station of the UE transmits the measurement reference signal 1 and the measurement reference signal 2 simultaneously in the time domain position of the two uplink DMRS symbols of the transmission subframe, where the transmission bandwidth of the reference signal 1 and the measurement reference signal 2 are measured.
  • the cyclic shift value used, the value of the RPF, and the frequency comb position used by the UE are the same.
  • the base station sends control information to the UE, where it is used to indicate that the UE sends the SRS, where the control information may be downlink control information and/or high layer signaling, including: sending time domain location indication information of the SRS, sending Bandwidth, cyclic shift index value, value of RPF, frequency ⁇ position used by the UE.
  • the time domain location indication information of the sending SRS may be 1 bit, 2 bits, or 3 bits, and is used to indicate a time domain location where the UE sends the SRS, where the time domain location is the time domain location and the last one where the two uplink DMRS symbols are located.
  • the time domain position where the data symbol is located; the cyclic shift index value is 3 bits or 4 bits, which is used to indicate the cyclic shift used by the UE when transmitting the SRS, and the value may be 8, 12 or 16; the value of the RPF is 1 bit.
  • the value may be 2 or 3 or 4; the frequency used by the UE is 1 bit or 2 bits, and the value ranges from 0 to 3.
  • the signaling of the UE base station indicates that the measurement reference signal 1, the measurement reference signal 2, and the measurement reference signal 3 are simultaneously transmitted in the time domain position of the two uplink DMRS symbols of the transmission subframe and the time domain position where the last data symbol is located.
  • the measurement reference signal 1, the transmission bandwidth of the measurement reference signal 2 and the measurement reference signal 3, the cyclic shift value used, the value of the RPF, and the frequency comb position used by the UE are the same.
  • the foregoing embodiment of the present invention solves the problem that the number of users decreases when multiple antennas transmit SRS in the LTE-A system in the prior art, and increases the number of SRS resources available in the LTE-A system, thereby improving the number of SRS resources available in the LTE-A system.
  • 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.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.

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

Abstract

La présente invention concerne un procédé et un système de transmission de signaux de référence de sondage (SRS). Le procédé comprend les étapes suivantes : réception par un terminal d'informations d'indication envoyées par une station de base ; et émission par le terminal d'un premier signal de référence de sondage (SRS) et d'un second signal SRS vers la station de base, en même temps, sur des symboles de multiplexage par répartition orthogonale de la fréquence (OFDM) placés dans une sous-trame indiquée dans les informations d'indication, respectivement. Grâce à l'invention, le nombre des utilisateurs qui peuvent être contenus dans un système LTE-A est accru.
PCT/CN2010/077040 2010-02-08 2010-09-17 Procédé et système de transmission de signaux de référence de sondage Ceased WO2011095009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010110955.4A CN101795145B (zh) 2010-02-08 2010-02-08 测量参考信号的发送方法及系统
CN201010110955.4 2010-02-08

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