WO2011120316A1 - 一种lte-a系统中测量参考信号的配置方法和系统 - Google Patents

一种lte-a系统中测量参考信号的配置方法和系统 Download PDF

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Publication number
WO2011120316A1
WO2011120316A1 PCT/CN2010/079944 CN2010079944W WO2011120316A1 WO 2011120316 A1 WO2011120316 A1 WO 2011120316A1 CN 2010079944 W CN2010079944 W CN 2010079944W WO 2011120316 A1 WO2011120316 A1 WO 2011120316A1
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Prior art keywords
srs
subframe
base station
frequency domain
aperiodic srs
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English (en)
French (fr)
Inventor
郝鹏
喻斌
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ZTE Corp
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ZTE Corp
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Priority to US13/638,004 priority Critical patent/US20130028138A1/en
Priority to EP10848774.5A priority patent/EP2542004B1/en
Publication of WO2011120316A1 publication Critical patent/WO2011120316A1/zh
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094Indication of how sub-channels of the path are allocated
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078Timing of allocation
    • H04L5/0082Timing of allocation at predetermined intervals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0092Indication of how the channel is divided

Definitions

  • the present invention relates to the field of communications, and in particular to a method and system for configuring a reference signal in a Long Term Evolution Advanced (LTE-A) system.
  • LTE-A Long Term Evolution Advanced
  • a user equipment uses a certain resource period according to configuration information of a base station (e-node-B, eNB) at a certain time and frequency position.
  • e-node-B e-node-B
  • Send a Sounding Reference Signal SRS
  • the eNB measures radio channel state information (CSI) according to the received SRS, and performs operations such as scheduling, power control, and resource allocation according to the obtained CSI.
  • CSI radio channel state information
  • the frame structure of the Frequency Division Duplex (FDD) mode of the LTE system also known as the frame structure type 1
  • the frame structure of the Time Division Duplex (TDD) mode also known as a frame structure type 2 (frame structure type 2).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the special subframe in the TDD mode includes three special time slots, which are Downlink Pilot Time Slot (DwPTS) and guard interval. (Guard Period, GP) and Uplink Pilot Time Slot (UpPTS).
  • DwPTS Downlink Pilot Time Slot
  • Guard interval Guard Period, GP
  • UpPTS Uplink Pilot Time Slot
  • the resource allocation in the LTE system is a resource block (RB or a physical resource block (PRB)), and one RB occupies 12 resource elements (Resources) in the frequency domain.
  • RB resource block
  • PRB physical resource block
  • One time slot in the time domain that is, 7 (Normal cyclic prefix (Normal CP)) or 6 (Extended cyclic prefix) Single Carrier Frequency-Division Multiple Access (Single Carrier Frequency-Division Multiple Access, SC-FDMA) symbol.
  • N is the number of subcarriers corresponding to one RB in the frequency domain.
  • the structure of RB is shown in Figure 3 (taking the ordinary CP as an example).
  • the SRS is periodically sent, and its configuration information includes the following:
  • each SRS bandwidth configuration corresponds to a tree structure.
  • B-SRS The SRS bandwidth (SRS-Bandwidth) of 0) corresponds to the maximum bandwidth (or SRS bandwidth range) of this SRS bandwidth configuration.
  • Tables 1 through 4 show the SRS bandwidth configurations for different upstream bandwidth ranges.
  • the bandwidth corresponding to 32 RBs is the maximum SRS bandwidth of the SRS bandwidth configuration
  • the SRS bandwidth of this layer is the bandwidth corresponding to 4 RBs, and one SRS bandwidth of the upper layer is split into two 3 layers of SRS bandwidth.
  • M SRS 0 M SRS, ⁇ N, M SRS, 2 N 2 M SRS, 3
  • the SRS sequence sent by the UE is obtained by cyclically shifting a root sequence. Different SRS sequences can be obtained by performing different cyclic shifts on the same root sequence, and the obtained SRS sequences are orthogonal to each other, so these SRS sequences can be allocated to different UEs, so that these UEs are in the same
  • the SRS signal is simultaneously transmitted on the time and frequency resources.
  • the SRS sequence defines eight cyclic shifts, which are: 0, 1, 2, 3, 4, 5, 6, 7 , indicated by 3 bit signaling. That is to say, under the same time and frequency resources, the UEs in the small area have 8 available code resources, and the eNB can configure up to 8 UEs to simultaneously send SRS.
  • the UE determines the frequency domain initial position of the SRS to be transmitted according to the upper layer signaling sent by the eNB. As shown in Figure 6, the UEs with different signaling will transmit SRS in different areas of the SRS bandwidth of the cell.
  • the SRS will calculate the SRS of each SRS transmission period according to the starting position of the frequency domain and a certain frequency hopping rule. The starting position of the signal frequency domain.
  • the base station first allocates an SRS bandwidth configuration index for all UEs in the cell, according to the number of RBs corresponding to the current uplink system bandwidth (N ⁇ ), which table in Table 1 to Table 4 is used, and then Based on this, the SRS bandwidth configuration used by the current cell can be determined.
  • the base station For a UE, the base station also assigns an SRS bandwidth index to it (or the index of the layer). According to the SRS bandwidth configuration and the bandwidth index in the cell, the UE can obtain the SRS bandwidth used by the UE. In addition, the base station also specifies the frequency domain start position of its SRS for each UE, and the UE calculates the frequency domain start position of each subsequent SRS transmission time according to the start position and a certain frequency hopping rule.
  • SRS period From the time domain, the UE only transmits the SRS on the last SC-FDMA symbol of the subframe.
  • the configuration of transmitting the SRS in the time domain is related to four parameters: Cell-specific Period (T SFC ) and subframe offset ( SFC ) , and UE-specific period ( r SRS ) and subframe offset ( T ffset ) as shown in Table 5 or Table 6, cell-specific periods and subframes
  • T SFC Cell-specific Period
  • r SRS UE-specific period
  • T ffset subframe offset
  • the offset gives the time domain subframe position that all UEs in the cell may send SRS, such as configuration 8 in Table 5, the period is 5 subframes, and the subframe offset is ⁇ 2, 3 ⁇ , which means the SRS in the cell.
  • the shortest period is 5ms, and there are only two in this 5ms
  • the locations may be used to transmit SRS, which are subframe 2 and subframe 3 in 5 subframes (subframe 0, subframe subframe 4, respectively) within 5 ms.
  • the UE-specific period and subframe offsets give specific time domain periods and subframe positions for a certain UE to transmit SRS.
  • configuration 2 in Table 7 indicates that the SRS period of a certain UE is 5 ms, and is transmitted in subframe 0 of 5 subframes (subframe 0, subframe subframe 4) within 5 ms.
  • the sending location specified by the UE-specific parameter must be included in the cell-specific sending location.
  • the LTE-Advanced system is a further evolution of the LTE system.
  • the base station needs to obtain channel information more quickly for uplink resource allocation, scheduling, power control, and estimation of the downlink channel using channel reciprocity.
  • the current periodic SRS cannot meet the channel measurement needs.
  • the technical problem to be solved by the present invention is to provide a method, a system, a base station, and a user equipment for configuring a reference signal in an LTE-A system, so that the base station can trigger the UE to transmit an SRS signal at any time, and measure the channel at any time.
  • the present invention provides a configuration of a measurement reference signal in an LTE-A system.
  • the method includes: the base station triggers one or more user equipments (UEs) to send aperiodic measurement reference signal (SRS) on one or more uplink subframes by using downlink control signaling.
  • the number of the uplink subframes is notified by the base station to the UE through high layer signaling or physical layer signaling, or the number of the uplink subframes is agreed by the base station and the UE.
  • the method further includes: after receiving the downlink control signaling sent by the base station, the UE sends the aperiodic SRS by using the aperiodic SRS resource on the uplink subframe according to the trigger of the base station.
  • the first subframe in the uplink subframe is: a subframe that is pre-agreed by the base station and the UE, or a subframe in which the base station implicitly notifies the UE by sending a downlink control signaling, or a downlink control of the base station.
  • the subframe of the UE is signaled.
  • the remaining uplink subframes except the first subframe in the uplink subframe are subframes pre-agreed by the base station and the UE, or the UE is notified by the base station by using downlink control signaling.
  • frame The base station implicitly notifying the first subframe in the uplink subframe of the UE by using a downlink subframe that sends downlink control signaling refers to:
  • the UE obtains the offset A in advance, and the base station sends the downlink control signaling in the downlink subframe X in the downlink radio frame m, and the UE sends the first one on the uplink subframe y in the corresponding uplink radio frame n.
  • the uplink subframe belongs to a cell specific period of the periodic SRS and a subframe range specified by the subframe offset.
  • the UE transmits the aperiodic SRS on a last single carrier frequency division multiplexing (SC-FDMA) symbol of the uplink subframe.
  • SC-FDMA single carrier frequency division multiplexing
  • the frequency domain location of the UE transmitting the aperiodic SRS is determined by the configuration related to the frequency domain, and the configuration related to the frequency domain is agreed by the base station and the UE, or And transmitting, by the base station, part or all of the configuration related to the frequency domain to the UE by using downlink control signaling, where the configuration related to the frequency domain includes: transmitting a frequency domain bandwidth of the aperiodic SRS and The frequency domain start position; when the base station triggers the UE to send the aperiodic SRS on the multiple uplink subframes, the frequency domain position of the multiple subframes in which the UE sends the aperiodic SRS is determined by the configuration related to the frequency domain, and the frequency is determined.
  • the domain-related configuration is all agreed by the base station and the UE, or the base station sends the configuration related to the frequency domain of all the uplink subframes to the UE by using the downlink control signaling, or the base station and the UE agree on the configuration of the partial uplink subframe, and the other part of the uplink subframe.
  • the configuration of the frame is sent to the UE by using downlink control signaling, and the configuration related to the frequency domain includes a frequency domain bandwidth and a frequency domain start position for transmitting the aperiodic SRS.
  • the bandwidth of the aperiodic SRS is the same as the bandwidth of the UE transmission period SRS.
  • the frequency domain start position of the aperiodic SRS on the first subframe in the uplink subframe is the same as the frequency domain start location of the UE transmitting the periodic SRS at a certain time.
  • the frequency domain start position of the aperiodic SRS on the first subframe in the uplink subframe is the same as the frequency domain start location of the next periodic SRS to be transmitted, or with the previous transmitted periodic SRS
  • the starting position of the frequency domain is the same.
  • the base station triggers the UE to send the aperiodic SRS in the multiple uplink subframes, except for the first uplink subframe in the uplink subframe, the frequency domain start position of the aperiodic SRS in the remaining uplink subframes and the first
  • the frequency domain start position of the aperiodic SRS on one uplink subframe is the same; or calculated according to the frequency hopping rule of the periodic SRS.
  • the frequency domain start position of the periodic SRS after the aperiodic SRS is not affected by the aperiodic SRS, or the UE starts with the frequency domain position of the aperiodic SRS on the first uplink subframe in the uplink subframe.
  • the method further includes: if the UE determines that there is still a periodic SRS to be sent on the uplink subframe, the UE selects to send: a periodic SRS and/or a non- Cycle SRS.
  • the base station reserves resources for the aperiodic SRS, and the reserved resource is used by one or more UEs, and the base station pre-configures one or more of the following resources as the acyclic SRS reserved resources: , frequency domain resources, and time domain resources;
  • the base station enables the UE to learn the reserved code resources by configuring a cyclic shift of the SRS root sequence and/or the sequence;
  • the base station configures the comb (Comb) information and/or the frequency band information to enable the UE to learn the reserved frequency domain.
  • the resource where the frequency band information includes a frequency domain start point and a bandwidth; the base station configures a subframe that sends an aperiodic SRS, so that the UE learns the reserved time domain resource.
  • the base station indicates the reserved resources for aperiodic SRS transmission through radio resource control layer signaling.
  • the downlink control signaling is physical layer signaling; the physical layer signaling is signaling in a physical downlink control channel.
  • the present invention further provides a base station in an Advanced Long Term Evolution (LTE-A) system, where the base station includes: a sending module, configured to: trigger one or more user equipments by using downlink control signaling ( Transmitting a non-periodic measurement reference signal (SRS) on one or more uplink subframes, so that after receiving the downlink control signaling sent by the base station, the UE uses the uplink subframe according to the trigger of the base station.
  • LTE-A Advanced Long Term Evolution
  • the aperiodic SRS resource sends an aperiodic SRS.
  • the present invention further provides a user equipment in an Advanced Long Term Evolution (LTE-A) system, where the user equipment includes: a receiving module, configured to: receive a base station for triggering the user equipment in one Or a downlink control signaling for transmitting a non-periodic measurement reference signal (SRS) on the uplink subframe; and a sending module, configured to: after receiving the downlink control signaling sent by the base station, according to the trigger of the base station, in the uplink sub Aperiodic SRS is transmitted on the frame using aperiodic SRS resources.
  • LTE-A Advanced Long Term Evolution
  • the aperiodic SRS configuration method and system provided by the present invention can determine the resources used by the aperiodic SRS, improve the channel measurement frequency of the UE, and better meet the channel measurement requirements of the LTE-A system. In addition, by reserving aperiodic SRS resources, the effects and conflicts of periodic and aperiodic SRS in the LTE-A system can be effectively avoided.
  • FIG. 1 is a schematic diagram of a frame structure of an LTE FDD mode
  • FIG. 2 is a schematic diagram of a frame structure of an LTE TDD mode
  • FIG. 3 is a resource block structure diagram
  • FIG. 4 is a schematic diagram of a tree structure of an SRS bandwidth
  • 6 is a schematic diagram of a frequency domain start position of an SRS bandwidth
  • FIG. 7 is a schematic diagram of a time-frequency position of a periodic and aperiodic SRS according to Embodiment 1 of the present invention
  • FIG. 8 is a time-frequency location of a periodic and aperiodic SRS according to Embodiment 2 of the present invention
  • FIG. 9 is a schematic diagram of time-frequency positions of periodic and aperiodic SRSs according to Embodiment 3 of the present invention
  • FIG. 10 is a schematic diagram of time-frequency positions of periodic and aperiodic SRSs according to Embodiment 4 of the present invention
  • FIG. FIG. 12 is a schematic diagram showing time-frequency positions of periodic and aperiodic SRSs according to Embodiment 6 of the present invention
  • FIG. 13 is a schematic diagram showing time-frequency positions of periodic and aperiodic SRSs according to Embodiment 7 of the present invention
  • FIG. 15 is a schematic diagram of time-frequency positions of periodic and aperiodic SRSs according to Embodiment 9 of the present invention
  • FIG. 16 is a timing diagram of periodic and aperiodic SRS according to Embodiment 9 of the present invention.
  • Frequency position FIG. 17 is a schematic diagram of time-frequency positions of periodic and aperiodic SRSs according to Embodiment 11 of the present invention.
  • FIG. 18 is a schematic diagram of time-frequency positions of periodic and aperiodic SRSs according to Embodiment 12 of the present invention;
  • FIG. FIG. 20 is a schematic diagram of a time-frequency position of a periodic and aperiodic SRS according to another embodiment of the present invention;
  • FIG. 21 is a schematic diagram of a method for configuring a measurement reference signal according to the present invention.
  • the present invention proposes an aperiodic SRS configuration mechanism, so that the base station can trigger the UE to transmit the SRS at any time (whenever it deems it is needed), and the channel is ready for use. Make measurements.
  • the resource for transmitting the periodic SRS is called a periodic SRS resource
  • the resource for transmitting the aperiodic SRS is called a non-periodic SRS resource.
  • the inventive concept includes: the base station triggers one or more UEs to send an aperiodic SRS on one or more uplink subframes by using downlink control signaling.
  • the method further includes: after receiving the downlink control signaling sent by the base station, the UE sends the aperiodic SRS by using the aperiodic SRS resource on the uplink subframe according to the trigger of the base station.
  • the number of the uplink subframes is notified by the base station to the UE or the base station and the UE through high layer signaling or physical layer signaling.
  • the first one of the uplink subframes described below refers to the uplink subframe; if the trigger transmits the aperiodic SRS on multiple uplink subframes, The first one of the uplink subframes described below refers to the latest uplink subframe in the time domain of the multiple uplink subframes.
  • the base station can be configured with the UE to configure the time-frequency configuration of the aperiodic SRS.
  • the base station can trigger the UE to send the aperiodic SRS only through the downlink control signaling of the lbit, and the overhead is small.
  • the downlink control signaling can be in the physical.
  • the downlink control channel is sent to the UE together with other signaling.
  • the base station may pre-configure the time-frequency configuration of the aperiodic SRS with the UE, and the other part is configured to be sent by using the downlink control signaling, and triggering the UE to send the aperiodic SRS by using the downlink control signaling;
  • the configuration and the time-frequency configuration delivered by the base station determine the time-frequency location for transmitting the aperiodic SRS.
  • the base station may also send all the configurations by using the downlink control signaling, and trigger the UE to send the aperiodic SRS by using the downlink control signaling, which requires a large overhead.
  • the time-frequency configuration of the aperiodic SRS described above includes a time domain related configuration and a frequency domain related configuration, where:
  • the time domain related configuration is used to enable the UE to know the time domain location of sending the aperiodic SRS, specifically The UE is informed that: the base station and the UE pre-arrange the subframes for transmitting the aperiodic SRS, so that after receiving the downlink control signaling, the UE sends the aperiodic SRS in the pre-agreed subframe; or, the base station sends the subframe.
  • the downlink subframe of the downlink control signaling implicitly informs the UE to send the uplink subframe of the aperiodic SRS.
  • the specific manner may be: the subframe number of the downlink subframe in which the base station sends the downlink control signaling is X, and the UE may be in the corresponding
  • the aperiodic SRS is transmitted on the uplink subframe, that is, the aperiodic SRS is sent in the uplink subframe with the subframe number X; or the subframe number and the subframe offset A of the downlink subframe according to the base station transmitting the downlink control signaling.
  • the uplink subframe that sends the aperiodic SRS is determined.
  • the subframe offset A can be configured in advance to the UE or pre-agreed with the UE. In summary, the UE needs to know the offset A in advance.
  • the UE and the base station agree.
  • the base station may directly notify the UE to send an uplink subframe of the aperiodic SRS through signaling.
  • the first subframe in the uplink subframe (including the case of triggering one uplink subframe and multiple uplink subframes) is a subframe that is pre-agreed by the base station and the UE, or is a downlink subframe that the base station sends downlink control signaling.
  • the frame implicitly notifies the subframe of the UE, or the base station directly notifies the subframe of the UE by using downlink control signaling.
  • the remaining uplink subframes are subframes pre-arranged by the base station and the UE, or subframes notified by the base station to the UE by using downlink control signaling. Further, the UE preferably transmits on the last SC-FDMA symbol of the determined subframe.
  • the base station controls the UE to send the aperiodic SRS in the subframe range of the periodic SRS, that is, the base station triggers the UE to send the aperiodic SRS in the subframe range, so as to avoid the collision between the aperiodic SRS and the PUCCH, the sub-SRS sub-segment
  • the frame range refers to the cell-specific period of the periodic SRS and the subframe range specified by the subframe offset.
  • the frequency domain related configuration is used to enable the UE to learn the frequency domain location for transmitting the aperiodic SRS, including the frequency domain bandwidth and the frequency domain starting position of the aperiodic SRS, where:
  • the base station triggers the UE to send the aperiodic SRS in an uplink subframe
  • the frequency domain location of the UE transmitting the aperiodic SRS is determined by the configuration related to the frequency domain, and the configuration related to the frequency domain is agreed by the base station and the UE, or
  • the base station sends part or all of the configuration related to the frequency domain to the UE by using downlink control signaling.
  • the frequency domain locations of the multiple subframes in which the UE sends the aperiodic SRS are determined by the configuration related to the frequency domain, and the configurations related to the frequency domain are all
  • the base station and the UE are in agreement, or the base station sends the configuration related to the frequency domain of all the uplink subframes to the UE by using the downlink control signaling, or the base station and the UE agree on the configuration of the partial uplink subframe, and the configuration of the other uplink subframe is controlled by the downlink. Signaling is sent to the UE.
  • the aperiodic SRS frequency domain bandwidth may be the same as or different from the frequency domain bandwidth of the periodic SRS sent by the UE (for example, an integer multiple thereof).
  • the frequency domain start position of the aperiodic SRS in the first subframe of the downlink subframe is the same as the frequency domain start location of the UE in the transmission period SRS of a certain subframe n.
  • the subframe n is a transmission subframe of the first periodic SRS after the subframe is transmitted for the aperiodic SRS, that is, a frequency domain start position of the aperiodic SRS on the first subframe in the downlink subframe.
  • the frequency domain start position of the aperiodic SRS on the frame is the same as the frequency domain start position of the previous transmitted period SRS.
  • the frequency domain start position of the aperiodic SRS in the remaining uplink subframes is the same as the first uplink subframe in the uplink subframe.
  • the frequency domain start position of the aperiodic SRS on the first uplink subframe is the same; or is calculated according to the frequency hopping rule of the periodic SRS.
  • the frequency domain start position of the aperiodic SRS is the same as the frequency domain start position of the next periodic SRS to be transmitted, the frequency domain start position of the next periodic SRS to be transmitted may be unchanged, that is, the aperiodic
  • the frequency domain start position of the periodic SRS after the SRS is not affected by the aperiodic SRS, or is changed according to the frequency domain position of the aperiodic SRS.
  • the UE starts with the frequency domain position of the aperiodic SRS in the first uplink subframe of the uplink subframe, and combines the frequency hopping rule of the periodic SRS, and recalculates the frequency domain of the SRS transmission time after each period. Starting position. If a plurality of uplink subframes are configured to transmit the aperiodic SRS, the UE uses the frequency domain position of the aperiodic SRS on the first uplink subframe in the uplink subframe. To initiate, in conjunction with the frequency hopping rule of the periodic SRS, the frequency domain start position of each periodic SRS and/or the aperiodic SRS triggered by the same downlink control signaling is calculated.
  • the UE before transmitting the aperiodic SRS, if it is determined that there is a periodic SRS to be transmitted on the subframe in which the base station triggers transmitting the aperiodic SRS, the UE selects to transmit: a periodic SRS and/or an aperiodic SRS, when the UE is When the transmission period SRS transmits the aperiodic SRS again, it can be transmitted in a frequency division manner, that is, the periodic SRS is transmitted in one frequency band, and the aperiodic SRS is transmitted in another frequency band.
  • the base station may also reserve aperiodic SRS resources for one or more UEs, and the reserved aperiodic SRS resources may be shared by multiple UEs, and the reserved aperiodic SRS resources are reserved.
  • the base station pre-configures (by convention or signaling) one or more of the following resources as reserved aperiodic SRS resources: code resources, frequency domain resources, and time domain resources. The base station enables the UE to learn the reserved code resources by configuring a cyclic shift of the SRS root sequence and/or sequence.
  • the base station obtains the reserved frequency domain resources by configuring the Comb and/or the frequency band information, where the frequency band information includes a frequency domain start point and a bandwidth.
  • the base station configures the subframe in which the aperiodic SRS is sent, so that the UE learns the reserved time domain resource.
  • the base station indicates, by using Radio Resource Control (RRC) layer signaling, resources reserved for one or more UEs for aperiodic SRS, that is, the reserved resources are allocated to the UE by using RRC layer signaling. .
  • RRC Radio Resource Control
  • the downlink control signaling is preferably physical layer signaling.
  • the base station triggers the aperiodic SRS by using the physical layer signaling
  • the UE sends the aperiodic SRS signal by using the aperiodic SRS resource.
  • the physical layer signaling is signaling in the PDCCH.
  • a configuration system for implementing the foregoing method including a base station and a UE, where: the base station is configured to: trigger one or more UEs to send an aperiodic SRS on one or more uplink subframes by using downlink control signaling; After receiving the downlink control signaling sent by the base station, the aperiodic SRS is sent by using the aperiodic SRS resource on the uplink subframe according to the trigger of the base station. Further, the base station and the UE have configuration modules, and the configuration module is configured to: save the configuration agreed by the two parties or learned by a certain mechanism, and also have sending and receiving modules, which are used to complete the interaction between the two.
  • Embodiment 1 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position "" in Figure 7.
  • the time domain location shown in the middle is used to send the aperiodic SRS using the pre-configured aperiodic SRS resource.
  • the aperiodic SRS has no effect on the periodic SRS to be sent later.
  • the pre-configured aperiodic SRS resource time-frequency configuration The bandwidth of the aperiodic SRS is the same as the bandwidth of the periodic SRS, and the frequency domain start position of the non-periodic SRS is the same as the frequency domain start position of the next periodic SRS to be transmitted, that is, with the radio frame m+1 subframe 0.
  • the frequency domain start position of the upper periodic SRS is the same, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0 does not change.
  • the subframe in which the aperiodic SRS is transmitted belongs to the cell.
  • Embodiment 2 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position in FIG.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is the same as the bandwidth of the periodic SRS, and the frequency domain start position of the aperiodic SRS and the frequency domain start position of the previous transmitted periodic SRS The same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m subframe 0, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m subframe 0 does not change.
  • the subframe in which the aperiodic SRS is transmitted belongs to a subframe range in which the cell may transmit the periodic SRS.
  • Embodiment 3 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position "" in Figure 9.
  • the periodic SRS to be transmitted after the aperiodic SRS changes due to the transmission of the aperiodic SRS.
  • the periodic SRS sent at the position shown in " ⁇ , is recalculated by the UE.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is the same as the bandwidth of the periodic SRS, and the frequency domain start position of the aperiodic SRS and the frequency domain start position of the next periodic SRS to be transmitted The same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0, and after the aperiodic SRS, the frequency domain start position and the lower period of the periodic SRS on the radio frame m+1 subframe 0
  • the frequency domain start position of one periodic SRS is the same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+2, and so on.
  • the subframe in which the aperiodic SRS is transmitted belongs to a subframe range in which the cell may transmit the periodic SRS.
  • Embodiment 4 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (i.e., configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7 , and the transmission timing of the periodic SRS is as shown in the "1" position in FIG.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is different from the bandwidth of the periodic SRS (in this embodiment, twice the periodic SRS bandwidth), and the frequency domain start of the aperiodic SRS
  • the location is the same as the frequency domain start position of the next SRS to be transmitted, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0, and after the aperiodic SRS, the radio frame m+ 1
  • the frequency domain start position of the periodic SRS on subframe 0 is unchanged.
  • the subframe in which the aperiodic SRS is transmitted belongs to a subframe range in which the cell may transmit the periodic SRS.
  • Embodiment 5 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, Configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position in Figure 11.
  • the time domain location shown in the middle is used to send the aperiodic SRS using the pre-configured aperiodic SRS resource.
  • the aperiodic SRS has no effect on the periodic SRS to be sent later.
  • the pre-configured aperiodic SRS resource time-frequency configuration Including: the bandwidth of the aperiodic SRS is different from the bandwidth of the periodic SRS (in this embodiment, twice the periodic SRS bandwidth), and the frequency domain start position of the aperiodic SRS and the frequency domain of the previous transmitted periodic SRS
  • the start position is the same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m subframe 0, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m subframe 0 does not change.
  • the subframe in which the aperiodic SRS is transmitted belongs to the cell possible transmission period SRS The range of sub-frames.
  • Embodiment 6 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position "" in Figure 12.
  • the periodic SRS to be transmitted after the aperiodic SRS changes due to the transmission of the aperiodic SRS.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: aperiodic The bandwidth of the SRS is different from the bandwidth of the periodic SRS (in this embodiment, the periodic SRS)
  • the frequency domain start position of the aperiodic SRS is the same as the frequency domain start position of the next periodic SRS to be transmitted, that is, the frequency domain start of the periodic SRS on the radio frame m+1 subframe 0.
  • the location is the same, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0 is the same as the frequency domain start position of the next period SRS, that is, with the radio frame m+2
  • the frequency domain start position of the periodic SRS is the same, and so on.
  • the subframe in which the aperiodic SRS is transmitted belongs to a subframe range in which the cell may transmit the periodic SRS.
  • the cell-specific period and subframe offset of the periodic SRS are configured to be 7 (that is, configuration 7 in Table 5).
  • the aperiodic SRS has no effect on the periodic SRS to be sent later.
  • the pre-configured aperiodic SRS resource time-frequency configuration The bandwidth of the aperiodic SRS is the same as the bandwidth of the periodic SRS, and the frequency domain start position of the non-periodic SRS is the same as the frequency domain start position of the next periodic SRS to be transmitted, that is, with the radio frame m+1 subframe 0.
  • the frequency domain start position of the upper periodic SRS is the same, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0 does not change.
  • the subframe in which the aperiodic SRS is transmitted does not belong to the cell. May send a sub-frame of the periodic SRS Wai.
  • the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position "" in FIG.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is the same as the bandwidth of the periodic SRS, and the frequency domain start position of the aperiodic SRS and the frequency domain start position of the previous transmitted periodic SRS The same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m subframe 0, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m subframe 0 does not change.
  • the subframe in which the aperiodic SRS is transmitted does not belong to the subframe range in which the cell may transmit the periodic SRS.
  • Embodiment 9 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the "I" position in FIG.
  • the periodic SRS to be transmitted after the aperiodic SRS changes in the frequency domain position due to the transmission of the aperiodic SRS.
  • the periodic SRS that should have been sent at the location shown in is recalculated by the UE, and the actual transmission location is seen as " , .
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is the same as the bandwidth of the periodic SRS, and the frequency domain start position of the aperiodic SRS and the frequency domain start position of the next periodic SRS to be transmitted The same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0, and after the aperiodic SRS, the radio frame m+1
  • the frequency domain start position of the periodic SRS on subframe 0 is the same as the frequency domain start position of the next periodic SRS, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+2, and so on.
  • the subframe in which the aperiodic SRS is transmitted does not belong to the subframe range in which the cell may transmit the periodic SRS
  • the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (i.e., configuration 7 in Table 5).
  • the aperiodic SRS has no effect on the periodic SRS to be sent later.
  • the pre-configured aperiodic SRS resource time-frequency configuration Including: the bandwidth of the aperiodic SRS is different from the bandwidth of the periodic SRS (in this embodiment, twice the periodic SRS bandwidth), and the frequency domain start position of the aperiodic SRS and the frequency domain of the next upcoming transmission period SRS
  • the start position is the same, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0, and after the aperiodic SRS, the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0 No change.
  • Send the aperiodic SRS The subframe does not belong to the subframe range in which the cell may transmit the periodic SRS.
  • Embodiment 11 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the position of "" in Figure 17.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is different from the bandwidth of the periodic SRS (in this embodiment, twice the periodic SRS bandwidth), and the frequency domain start of the aperiodic SRS
  • the location is the same as the frequency domain start position of the previous transmitted periodic SRS, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m subframe 0, and after the aperiodic SRS, the radio frame m subframe 0
  • the frequency domain start position of the upper cycle SRS does not change.
  • the subframe in which the aperiodic SRS is transmitted does not belong to the subframe range in which the cell may transmit the periodic SRS.
  • Embodiment 12 Taking the FDD system as an example, the cell-specific period and the subframe offset of the periodic SRS are configured to be 7 (ie, configuration 7 in Table 5).
  • the UE specific SRS period and subframe offset configuration of UE1 is 7, and the transmission timing of the periodic SRS is as shown in the "I" position in FIG.
  • the periodic SRS to be transmitted after the aperiodic SRS changes in the frequency domain position due to the transmission of the aperiodic SRS.
  • the pre-configured aperiodic SRS resource time-frequency configuration includes: the bandwidth of the aperiodic SRS is different from the bandwidth of the periodic SRS (in this embodiment, twice the periodic SRS bandwidth), and the frequency domain start of the aperiodic SRS
  • the location is the same as the frequency domain start position of the next SRS to be transmitted, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+1 subframe 0, and after the aperiodic SRS, the radio frame m+
  • the frequency domain start position of the periodic SRS on the subframe 0 is the same as the frequency domain start position of the next periodic SRS, that is, the same as the frequency domain start position of the periodic SRS on the radio frame m+2, and so on.
  • the subframe in which the aperiodic SRS is transmitted does not belong to
  • the frequency domain start positions of the second aperiodic SRS and the subsequent periodic SRS may be obtained based on the periodic frequency hopping rule, as shown in FIG. 19 and FIG. 20, respectively.
  • the embodiment further provides a base station in an Advanced Long Term Evolution (LTE-A) system, where the base station includes: a sending module, configured to: trigger one or more user equipments (UEs) in one or more by using downlink control signaling Transmitting aperiodic measurement reference signal (SRS) on multiple uplink subframes, so that after receiving the downlink control signaling sent by the base station, the UE sends the aperiodic SRS resource on the uplink subframe according to the trigger of the base station.
  • LTE-A Advanced Long Term Evolution
  • the embodiment further provides a user equipment in an advanced long-term evolution (LTE-A) system, where the user equipment includes: a receiving module, configured to: the receiving base station is configured to trigger the user equipment to be in one or more uplinks a downlink control signaling for transmitting a non-periodic measurement reference signal (SRS) on the subframe; and a sending module, configured to: after receiving the downlink control signaling sent by the base station, using the non-period on the uplink subframe according to the trigger of the base station
  • the periodic SRS resource sends an aperiodic SRS.
  • the aperiodic SRS configuration method and system provided by the present invention can determine the resources used by the aperiodic SRS, improve the channel measurement frequency of the UE, and better meet the channel measurement requirements of the LTE-A system. In addition, by reserving aperiodic SRS resources, the effects and conflicts of periodic and aperiodic SRS in the LTE-A system can be effectively avoided.

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Description

一种 LTE-A系统中测量参考信号的配置方法和系统
技术领域 本发明涉及通信领域, 具体而言, 涉及一种高级长期演进( Long Term Evolution Advanced, LTE-A ) 系统中测量参考信号的配置方法和系统。
背景技术
在长期演进 ( Long Term Evolution , LTE ) 系统中, 用户设备(User Equipment, UE)根据基站( e-node-B , eNB)的配置信息, 在一定的时、 频位 置, 使用一定的资源周期的发送测量参考信号 (Sounding Reference Signal, SRS ) 。 eNB 根据接收到的 SRS 测量无线信道状态信息 (Channel State Information, CSI ) , 并根据得到的 CSI进行调度、 功控、 以及资源分配等操 作。
LTE系统频分双工 ( Frequency Division Duplex, FDD )模式的帧结构(又 称为第一类帧结构 (frame structure type 1 ) )和时分双工 (Time Division Duplex, TDD )模式的帧结构(又称为第二类帧结构( frame structure type 2 ) ) 分别如图 1和图 2所示, 其中, 一个 10ms ( 307200Ts, 1ms = 30720 Ts ) 的 无线帧由 10个 1ms的子帧组成, 每个普通子帧分为两个时隙, 每个时隙为 0.5ms , TDD模式中的特殊子帧包含三个特殊时隙, 分别是下行导频时隙 ( Downlink Pilot Time Slot, DwPTS ) 、 保护间隔( Guard Period, GP )及上 行导频时隙 (Uplink Pilot Time Slot, UpPTS ) 。
LTE系统中的资源分配以资源块(Resource Block, RB或称为物理资源 块(Physical Resource Block, PRB ) )为单位, 一个 RB在频域上占 12个资 源单元( Resource Element, RE ) , 在时域上占一个时隙, 即 7 (普通循环前 缀 ( Normal cyclic prefix, Normal CP ) )或 6个(扩展 CP ( Extended cyclic prefix ) )单载波频分复用 ( Single Carrier Frequency-Division Multiple Access, SC-FDMA )符号。 如果定义上行系统带宽在频域上对应的 RB总数为 , N 为一个 RB在频域上所对应的子载波数。 RB的结构如图 3所示(以普通 CP为例) 。 在 LTE系统中, SRS是周期发送的, 其配置信息包括如下 ^容:
• SRS带宽配置及 SRS带宽 LTE系统中, SRS信号的频域带宽采用树型结构进行配置。如图 4所示, 每一种 SRS带宽配置(即 SRS bandwidth configuration )对应一个树型结构, 在图 4的结构中, 有 B— SRS=0 ~ 4共四层, 最高层( B— SRS=0 )的 SRS带宽 ( SRS-Bandwidth )对应了这种 SRS带宽配置的最大带宽(或称为 SRS带宽 范围) 。 表 1〜表 4给出了不同上行带宽范围内的 SRS带宽配置。 以表 1中 SRS带宽配置( CSRS ) =1为例, B— SRS (即表 1中的 BSRS ) = 0为 0层, 是 树型结构的最高层, 这一层所对应的 SRS带宽为 32个 RB所对应的带宽, 是这种 SRS带宽配置的最大 SRS带宽; B一 SRS =1为 1层, 这一层 SRS带宽 为 16个 RB对应的带宽, 且上一层的一个 SRS带宽拆分成 2个 1层的 SRS 带宽; B— SRS =2为 2层, 这一层 SRS带宽为 8个 RB对应的带宽, 且上一 层的一个 SRS带宽拆分成 2个 2层的 SRS带宽; B— SRS = 3为 3层, 这一层 的 SRS带宽为 4个 RB对应的带宽, 且上一层的一个 SRS带宽拆分成 2个 3 层的 SRS带宽。
表 1 ( 6 < N"L < 40 )
Figure imgf000004_0001
表 2 ( 40 < N"L < 60 )
替换页(细则第 26条) SRS bandwidth SRS-Bandwidth SRS-Bandwidth SRS-Bandwidth SRS-Bandwidth configuration
BSRS = 0 BSRS = 1 BSRS = 2 BSRS = 3 r ^SRS
MSRS,0 MSRS,\ N、 MSRS,2 N2 MSRS,3
0 48 1 24 2 12 2 4 3
1 48 1 16 3 8 2 4 2
2 40 1 20 2 4 5 4 1
3 36 1 12 3 4 3 4 1
4 32 1 16 2 8 2 4 2
5 24 1 4 6 4 1 4 1
6 20 1 4 5 4 1 4 1
7 16 1 4 4 4 1 4 1 表 3 ( 60 < N"L < 80 )
Figure imgf000005_0001
表 4 ( 80 < NRB < 110 )
Figure imgf000005_0002
• Comb配置信息 在同一个 SRS频带内 SRS信号的子载波是间隔放置的, 也就是说, SRS 的发送采用梳状结构, 其中频率梳 ( frequency comb )的个数为 2。 如图 5所 示 ,每个 UE发送 SRS时,只使用两个频率梳中的一个( comb=0或者 comb=l ), 对应于 UE只使用频域索引为偶数或者奇数的子载波( sub-carrier )发送 SRS。 这种梳状结构允许更多的用户在同一 SRS带宽内发送 SRS信号。
3
替换页(细则第 26条) • 序列配置信息
UE发送的 SRS序列是通过对一条根序列进行循环移位得到的。 对同一 条根序列进行不同的循环移位 就能够得到不同的 SRS序列, 并且得到的这 些 SRS序列之间相互正交,所以可以将这些 SRS序列分配给不同的 UE使用, 使这些 UE在相同的时、 频资源上同时发送 SRS信号。 在 LTE中, SRS序列 定义了 8个循环移位, 分别为: 0, 1 , 2, 3 , 4, 5, 6, 7 , 用 3bit信令指示。 也就是说, 在同一时、 频资源下, 小区内的 UE有 8个可用的码资源, eNB 最多可以配置 8个 UE同时发送 SRS
• 频域起始位置及跳频信息
UE根据 eNB发送来的上层信令《 来确定自己发送 SRS的频域初始位 置。 如图 6所示, 分配了不同 信令的 UE, 将会在小区 SRS带宽的不同区 域发送 SRS UE将根据这个频域起始位置以及一定的跳频规则计算出之后 每个 SRS发送周期的 SRS信号频域起始位置。 在 LTE系统中,基站首先为小区内的所有 UE分配一个 SRS带宽配置索 引 根据当前的上行系统带宽所对应的 RB数(N^ )可以确定使用表 1 ~ 表 4中的哪一个表, 然后再根据 就可以确定当前小区使用的 SRS带宽配 置。 对于某个 UE, 基站还会为其分配一个 SRS带宽索引¾^ (或称为所在 层的索引 ) 。 根据小区内的 SRS带宽配置和带宽索引¾^ , UE就可以得到 它使用的 SRS带宽。另外,基站还会为每个 UE指定其 SRS的频域起始位置, UE根据这个起始位置以及一定的跳频规则计算出之后每个发送 SRS时刻的 频域起始位置。
• SRS周期、 子帧偏置 从时域上看, UE只在子帧的最后一个 SC-FDMA符号上发送 SRS UE 在时域发送 SRS 的配置与四个参数有关: 小区专有 (cell-specific ) 的周期 ( TSFC )和子帧偏置( SFC ) ,及 UE-specific的周期( rSRS )和子帧偏置( T。ffset ) 如表 5或表 6所示, cell-specific的周期和子帧偏置给出了小区内所有 UE可 能发送 SRS的时域子帧位置, 如表 5中的配置 8, 周期为 5个子帧, 子帧偏 移为 {2, 3} , 意思是本小区内 SRS的最短周期为 5ms, 且在这 5ms内只有两 个位置可能用于发送 SRS, 分别是这 5ms内 5个子帧 (分别为: 子帧 0, 子 帧 子帧 4 ) 中的子帧 2和子帧 3。 如表 7或表 8所示, UE-specific的周 期和子帧偏置给出了某个 UE发送 SRS的具体时域周期和子帧位置。 比如表 7中的配置 2, 表示某个 UE的 SRS周期为 5ms, 且在这 5ms内的 5个子帧 (分别为子帧 0,子帧 子帧 4 )中的子帧 0发送。需要注意的是 , UE-specific 参数指定的发送位置必须包含在 cell-specific发送位置之中。
表 5 FDD Cell Specific SRS周期及子帧偏移配置
Figure imgf000007_0001
5
替换页(细则第 26条) 3 0011 5 {1,4}
4 0100 5 {1,2,3}
5 0101 5 {1,2,4}
6 0110 5 {1,3,4}
7 0111 5 {1,2,3,4}
8 1000 10 {1,2,6}
9 1001 10 {1,3,6}
10 1010 10 {1,6,7}
11 1011 10 {1,2,6,8}
12 1100 10 {1,3,6,9}
13 1101 10 {1,4,6,7}
14 1110 reserved reserved
15 1111 reserved reserved 表 7 FDD UE Specific SRS周期及子帧偏移配置
Figure imgf000008_0001
6
替换页(细则第 26条) 1 2 0,2
2 2 1,2
3 2 0,3
4 2 1,3
5 2 0,4
6 2 1,4
7 2 2,3
8 2 2,4
9 2 3,4
10-14 5 I .\Q
15-24 10
1 si<s -\5
25-44 20 I SRS -25
45-84 40 .45
85-164 80 as—85
165-324 160
7^ -165
325-644 320
—325
645-1023 reserved reserved
LTE-Advanced系统是 LTE系统的进一步演进。 在这个系统中, 基站需 要更加快速的获得信道信息以便进行上行资源分配、 调度、 功控、 以及利用 信道互易性估计下行信道。 但目前的周期 SRS不能满足信道测量需要。
发明内容 本发明要解决的技术问题是提供一种 LTE-A 系统中测量参考信号的配 置方法、 系统、 基站和用户设备, 便于基站随时触发 UE发送 SRS信号, 随 时对信道进行测量。 为解决上述技术问题,本发明提供一种 LTE-A系统中测量参考信号的配
7
替换页(细则第 26条) 置方法, 该方法包括: 基站通过下行控制信令触发一个或多个用户设备 ( UE )在一个或多个上 行子帧上发送非周期测量参考信号 (SRS ) 。 所述上行子帧的数量由基站通过高层信令或物理层信令通知 UE或所述 上行子帧的数量由基站与 UE约定。 所述方法还包括, 所述 UE接收到基站发送的下行控制信令后, 根据基站的触发在所述上 行子帧上使用非周期 SRS资源发送非周期 SRS。 所述上行子帧中的第一个子帧为: 基站与 UE预先约定的子帧, 或者为 基站通过发送下行控制信令的下行子帧隐含通知 UE的子帧, 或为基站通过 下行控制信令通知 UE的子帧。 当所述上行子帧有多个时, 除上行子帧中的第一个子帧之外的其余上行 子帧为基站与 UE预先约定的子帧或由基站通过下行控制信令通知 UE的子 帧。 所述基站通过发送下行控制信令的下行子帧隐含通知所述 UE的所述上 行子帧中的第一个子帧是指:
UE预先获知偏移量 A, 设基站在下行无线帧 m中的下行子帧 X中发送 下行控制信令, 则 UE在对应的上行无线帧 n中的上行子帧 y上发送第一个 所述上行子帧上的非周期 SRS, 其中 0<=A<=320。 所述上行子帧属于周期 SRS的小区专有( cell specific )周期及子帧偏移 所规定的子帧范围。 所述 UE在所述上行子帧的最后一个单载波频分复用( SC-FDMA )符号 上发送所述非周期 SRS。 基站触发 UE在一个上行子帧上发送非周期 SRS时, 所述 UE发送非周 期 SRS的频域位置由与频域有关的配置决定,所述与频域有关的配置由基站 与 UE约定, 或者基站通过下行控制信令将所述与频域有关的配置的部分或 全部发送给 UE, 所述与频域有关的配置包括发送非周期 SRS的频域带宽和 频域起始位置; 基站触发 UE在多个上行子帧上发送非周期 SRS时, 所述 UE发送非周 期 SRS的多个子帧的频域位置由与频域有关的配置决定,所述与频域有关的 配置全部由基站与 UE约定, 或者基站通过下行控制信令将所有上行子帧的 与频域有关的配置发送给 UE, 或者基站与 UE约定部分上行子帧的配置, 另 一部分上行子帧的配置通过下行控制信令发送给 UE, 所述与频域有关的配 置包括发送非周期 SRS的频域带宽和频域起始位置。 所述非周期 SRS的带宽与所述 UE发送周期 SRS的带宽相同。 所述上行子帧中第一个子帧上的非周期 SRS的频域起始位置与所述 UE 在某时刻发送周期 SRS的频域起始位置相同。 所述上行子帧中第一个子帧上的所述非周期 SRS 的频域起始位置与下 一个即将发送的周期 SRS的频域起始位置相同,或者与前一个已发送的周期 SRS的频域起始位置相同。 基站触发 UE在多个上行子帧上发送非周期 SRS时, 除所述上行子帧中 第一个上行子帧外,其余上行子帧中的非周期 SRS的频域起始位置与所述第 一个上行子帧上的非周期 SRS的频域起始位置相同; 或者根据周期 SRS的 跳频规则计算得到。 所述非周期 SRS之后的周期 SRS的频域起始位置不受非周期 SRS的影 响, 或者 UE以所述上行子帧中第一个上行子帧上的非周期 SRS的频域位置 为起始, 结合周期 SRS的跳频规则, 计算之后每个周期 SRS和 /或由同一个 下行控制信令触发的非周期 SRS的频域起始位置。 所述 UE在发送非周期 SRS 的步骤之前, 所述方法还包括: 如果所述 UE判断在所述上行子帧上还有周期 SRS需要发送, 则所述 UE选择发送: 周期 SRS和 /或非周期 SRS。 所述基站为非周期 SRS预留资源, 一个所述预留资源被一个或多个 UE 使用, 所述基站向 UE预先配置以下资源的一种或几种作为非周期 SRS预留 资源: 码资源、 频域资源、 以及时域资源; 所述基站通过配置 SRS根序列和 /或序列的循环移位,使 UE获知预留的 码资源; 所述基站通过配置梳(Comb )信息和 /或频带信息, 使 UE获知预 留的频域资源, 其中所述频带信息包括频域起点和带宽; 所述基站通过配置 发送非周期 SRS的子帧, 使 UE获知预留的时域资源。 所述基站通过无线资源控制层信令指示预留的用于非周期 SRS 发送的 资源。 所述下行控制信令为物理层信令; 所述物理层信令为物理下行控制信道 中的信令。 为解决上述技术问题, 本发明还提供一种高级长期演进(LTE-A ) 系统 中的基站, 所述基站包括: 发送模块,其设置为:通过下行控制信令触发一个或多个用户设备(UE ) 在一个或多个上行子帧上发送非周期测量参考信号 (SRS ) , 以使所述 UE 在接收到基站发送的下行控制信令后, 根据基站的触发在所述上行子帧上使 用非周期 SRS资源发送非周期 SRS。 为解决上述技术问题, 本发明还提供一种高级长期演进(LTE-A ) 系统 中的用户设备, 所述用户设备包括: 接收模块, 其设置为: 接收基站用于触发所述用户设备在一个或多个上 行子帧上发送非周期测量参考信号 (SRS ) 的下行控制信令; 以及 发送模块, 其设置为: 接收到基站发送的下行控制信令后, 根据基站的 触发在所述上行子帧上使用非周期 SRS资源发送非周期 SRS。
本发明提供的非周期 SRS配置方法和系统, 可以确定非周期 SRS所使 用的资源, 能够提高 UE信道测量频率, 更好的满足 LTE-A系统对信道测量 的要求。 另外, 通过预留非周期 SRS资源, 可以有效的避免在 LTE-A系统 中周期和非周期 SRS的影响和冲突。
附图概述 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中:
图 1为 LTE FDD模式的帧结构示意图; 图 2为 LTE TDD模式的帧结构示意图; 图 3为资源块结构图; 图 4为 SRS带宽的树状结构示意图; 图 5为 SRS的梳状结构示意图; 图 6为 SRS带宽的频域起始位置示意图; 图 7为本发明实施例 1周期与非周期 SRS的时频位置示意图; 图 8为本发明实施例 2周期与非周期 SRS的时频位置示意图; 图 9为本发明实施例 3周期与非周期 SRS的时频位置示意图; 图 10为本发明实施例 4周期与非周期 SRS的时频位置示意图; 图 11为本发明实施例 5周期与非周期 SRS的时频位置示意图; 图 12为本发明实施例 6周期与非周期 SRS的时频位置示意图; 图 13为本发明实施例 7周期与非周期 SRS的时频位置示意图; 图 14为本发明实施例 8周期与非周期 SRS的时频位置示意图; 图 15为本发明实施例 9周期与非周期 SRS的时频位置示意图; 图 16为本发明实施例 10周期与非周期 SRS的时频位置示意图; 图 17为本发明实施例 11周期与非周期 SRS的时频位置示意图; 图 18为本发明实施例 12周期与非周期 SRS的时频位置示意图; 图 19为本发明另一实施例周期与非周期 SRS的时频位置示意图; 图 20为本发明另一实施例周期与非周期 SRS的时频位置示意图; 图 21为本发明中测量参考信号的配置方法的示意图。 本发明的较佳实施方式 本发明为了满足 LTE-Advanced系统的信道测量需要, 提出一种非周期 SRS配置机制, 以便基站可以随时 (在其认为需要的任何时候)触发 UE发 送 SRS, 随时对信道进行测量。 本文中, 发送周期 SRS的资源称为周期 SRS 资源, 发送非周期 SRS的资源称为非周期 SRS资源。 本发明的发明构思如图 21所示, 包括:基站通过下行控制信令触发一个 或多个 UE在一个或多个上行子帧上发送非周期 SRS。 还包括: UE接收到基站发送的下行控制信令后, 根据基站的触发在所 述上行子帧上使用非周期 SRS资源发送非周期 SRS。 所述上行子帧的数量由基站通过高层信令或物理层信令通知 UE或基站 与 UE约定。 如果触发在一个上行子帧上发送非周期 SRS, 则下文中所述的上行子帧 中的第一个是指该个上行子帧;如果触发在多个上行子帧上发送非周期 SRS, 则下文中所述的上行子帧中的第一个是指该多个上行子帧中时域上最近的上 行子帧。 具体地, 基站可以与 UE预先配置好发送非周期 SRS的时频配置, 此时 基站可以仅通过 lbit的下行控制信令触发 UE发送非周期 SRS, 开销较小, 该下行控制信令可以在物理下行控制信道 ( Physical Downlink Control Channel, PDCCH ) 中与其他信令一起发送给 UE。 或者, 基站也可以与 UE 预先配置好一部分非周期 SRS的时频配置,另一部分配置通过下行控制信令 下发, 并通过该下行控制信令触发 UE发送非周期 SRS; UE根据预先的时频 配置以及基站下发的时频配置确定发送非周期 SRS的时频位置。 或者, 基站 也可以通过下行控制信令下发全部配置, 同时通过该下行控制信令触发 UE 发送非周期 SRS, 此种方法需要的开销较大。 上述非周期 SRS 的时频配置包括与时域有关的配置和与频域有关的配 置, 其中:
与时域有关的配置用于使 UE获知发送非周期 SRS的时域位置, 具体可 以通过以下方式使 UE获知: 基站与 UE预先约定发送非周期 SRS的子帧, 这样, UE在收到下行控 制信令后, 在预先约定的子帧上发送非周期 SRS; 或者, 基站通过发送下行控制信令的下行子帧隐含地告知 UE发送非周期 SRS 的上行子帧, 具体方式可以是: 基站发送下行控制信令的下行子帧的子帧号 为 X, 则 UE可以在对应的上行子帧上发送非周期 SRS, 即在子帧号为 X的 上行子帧发送非周期 SRS; 或者, UE根据基站发送下行控制信令的下行子 帧的子帧号以及子帧偏移量 A计算后确定发送非周期 SRS的上行子帧,该子 帧偏移量 A可以预先通过信令配置给 UE或与 UE预先约定, 总之 UE需预 先获知该偏移量 A, 例如, UE与基站约定子帧偏移量为 2, 且基站在下行无 线帧 m中的子帧 X ( =5 )上发送下行控制信令, UE接收到下行控制信令后, 计算发送非周期 SRS的上行子帧为 5+2=7, 则 UE在上行无线帧 n ( n=m ) 中的子帧 y ( =7 )上发送非周期 SRS, 0<=A<=320, A=(10*n+y)-(10*m+x)。 当然, 在其他实施例中, 基站也可以通过信令显示地直接通知 UE发送非周 期 SRS的上行子帧。 所述上行子帧中的第一个子帧 (包括触发一个上行子帧和多个上行子帧 的情况) 为基站与 UE预先约定的子帧, 或者为基站通过发送下行控制信令 的下行子帧隐含通知 UE的子帧,或者由基站通过下行控制信令直接通知 UE 的子帧。 当所述上行子帧有多个时, 其余上行子帧为基站与 UE预先约定的 子帧或由基站通过下行控制信令通知 UE的子帧。 进一步地, UE优选在所确定的子帧的最后一个 SC-FDMA符号上发送。 优选地, 基站控制 UE在周期 SRS的子帧范围内发送非周期 SRS, 即基 站在该子帧范围内触发 UE发送非周期 SRS, 这样可以避免非周期 SRS与 PUCCH冲突, 所述周期 SRS的子帧范围是指周期 SRS的 cell-specific周期 和子帧偏置所规定的子帧范围。
与频域有关的配置用于使 UE获知发送非周期 SRS的频域位置, 包括发 送非周期 SRS的频域带宽及频域起始位置, 其中: 基站触发 UE在一个上行子帧上发送非周期 SRS时, 所述 UE发送非周 期 SRS的频域位置由与频域有关的配置决定,所述与频域有关的配置由基站 与 UE约定, 或者基站通过下行控制信令将所述与频域有关的配置的部分或 全部发送给 UE。 基站触发 UE在多个上行子帧上发送非周期 SRS时, 所述 UE发送非周 期 SRS的多个子帧的频域位置由与频域有关的配置决定,所述与频域有关的 配置全部由基站与 UE约定, 或者基站通过下行控制信令将所有上行子帧的 与频域有关的配置发送给 UE, 或者基站与 UE约定部分上行子帧的配置, 另 一部分上行子帧的配置通过下行控制信令发送给 UE。 所述非周期 SRS频域带宽可以与所述 UE发送的周期 SRS的频域带宽相 同或者不同 (例如是其整数倍) 。 所述下行子帧中第一个子帧上的非周期 SRS的频域起始位置与所述 UE 在某子帧 n发送周期 SRS的频域起始位置相同。 优选地, 所述子帧 n为此非 周期 SRS发送子帧之后第一个周期 SRS的发送子帧, 即所述下行子帧中第 一个子帧上的非周期 SRS的频域起始位置与下一个即将发送的周期 SRS的 频域起始位置相同; 或者所述子帧 n为此非周期 SRS发送子帧前一个周期 SRS的发送子帧,即所述下行子帧中第一个子帧上的非周期 SRS的频域起始 位置与前一个已发送的周期 SRS的频域起始位置相同。 当基站触发 UE在多 个上行子帧上发送非周期 SRS时, 除所述上行子帧中第一个上行子帧外, 其 余上行子帧中的非周期 SRS 的频域起始位置与所述第一个上行子帧上的非 周期 SRS的频域起始位置相同; 或者根据周期 SRS的跳频规则计算得到。 当所述非周期 SRS的频域起始位置与下一个即将发送的周期 SRS的频 域起始位置相同时, 下一个即将发送的周期 SRS的频域起始位置可不变, 即 所述非周期 SRS之后的周期 SRS的频域起始位置不受非周期 SRS的影响, 或根据所述非周期 SRS的频域位置做改变, 具体地, 如果仅配置在一个上行 子帧上发送非周期 SRS, 则 UE以所述上行子帧中第一个上行子帧上的非周 期 SRS的频域位置为起始, 并结合周期 SRS的跳频规则, 重新计算之后每 个周期 SRS发送时刻的频域起始位置。如果配置有多个上行子帧发送非周期 SRS, 则 UE以所述上行子帧中第一个上行子帧上的非周期 SRS的频域位置 为起始, 结合周期 SRS的跳频规则, 计算之后每个周期 SRS和 /或由同一个 下行控制信令触发的非周期 SRS的频域起始位置。
对于 UE而言, 其在发送非周期 SRS之前, 如果判断在基站触发发送非 周期 SRS的子帧上有周期 SRS需要发送, 则此 UE选择发送: 周期 SRS和 / 或非周期 SRS, 当 UE既发送周期 SRS又发送非周期 SRS时, 可釆用频分方 式发送, 即周期 SRS在一个频带上发送, 非周期 SRS在另一个频带上发送。
为了避免与其他 UE 的周期 SRS发生冲突, 基站还可以为一个或多个 UE预留非周期 SRS资源, 该预留的非周期 SRS资源可供多个 UE共享, 该 预留的非周期 SRS资源仅用于 UE发送非周期 SRS,基站向 UE预先配置(通 过约定或信令配置)以下资源的一种或几种作为预留的非周期 SRS资源: 码 资源、 频域资源、 时域资源。 基站通过配置 SRS根序列和 /或序列的循环移位,使 UE获知预留的码资 源。 基站通过配置 Comb和 /或频带信息, 使 UE获知预留的频域资源, 其中 所述频带信息包括频域起点和带宽。 基站通过配置发送非周期 SRS的子帧, 使 UE获知预留的时域资源。 优选地, 基站通过无线资源控制 (Radio Resource Control, RRC )层信 令指示为一个或多个 UE预留的用于非周期 SRS的资源, 即通过 RRC层信 令将预留的资源配置给 UE。
所述下行控制信令优选为物理层信令, 基站通过物理层信令触发非周期 SRS时, UE使用所述的非周期 SRS资源发送非周期 SRS信号。 优选地, 所 述物理层信令为 PDCCH中的信令。
本文所述的约定包括基站和 UE直接约定配置的情况, 以及通过约定好 的参数和规则计算获知配置的情况。 实现上述方法的配置系统, 包括基站和 UE, 其中: 所述基站设置为: 通过下行控制信令触发一个或多个 UE在一个或多个 上行子帧上发送非周期 SRS; 所述 UE设置为: 在接收到基站发送的下行控制信令后, 根据基站的触 发在所述上行子帧上使用非周期 SRS资源发送非周期 SRS。 进一步地, 基站和 UE均有配置模块, 配置模块设置为: 保存两方约定 的或通过某种机制获知的配置, 也均有发送和接收模块, 用于完成两者之间 的交互。
下面将结合实施例, 来详细说明本发明。 需要说明的是, 在不冲突的情 况下, 本申请中的实施例及实施例中的特征可以相互任意组合。 实施例 1 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 7中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 5, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽相同, 且非周期 SRS的频域起始 位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1 子帧 0上周期 SRS的频域起始位置相同,且在有非周期 SRS后,无线帧 m+1 子帧 0上周期 SRS的频域起始位置不变。 发送该非周期 SRS的子帧属于小 区可能发送周期 SRS的子帧范围。 实施例 2 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 8中 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 5, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽相同, 且非周期 SRS的频域起始 位置与前一个已发送的周期 SRS的频域起始位置相同,即与无线帧 m子帧 0 上周期 SRS的频域起始位置相同, 且在有非周期 SRS后, 无线帧 m子帧 0 上周期 SRS的频域起始位置不变。 发送该非周期 SRS的子帧属于小区可能 发送周期 SRS的子帧范围。
实施例 3 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 9中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 5, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 在该非周期 SRS之后即将发送的周期 SRS由于该非周期 SRS的发送, 频域位置发生变化。 原本应在 "^, 所示位置发送的周期 SRS, 经 UE重新计 算后, 实际发送位置见 " " 。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽相同, 且非周期 SRS的频域起始 位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1 子帧 0上周期 SRS的频域起始位置相同,且在有非周期 SRS后,无线帧 m+1 子帧 0上周期 SRS的频域起始位置与下一个周期 SRS的频域起始位置相同, 即与无线帧 m+2上的周期 SRS的频域起始位置相同, 且以此类推。 发送该 非周期 SRS的子帧属于小区可能发送周期 SRS的子帧范围。
实施例 4 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 10中 "1" 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 5 , 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽不相同(在本实施例中为周期 SRS 带宽的两倍), 且非周期 SRS的频域起始位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1子帧 0上周期 SRS的频域起始位置 相同, 且在有非周期 SRS后, 无线帧 m+1子帧 0上周期 SRS的频域起始位 置不变。 发送该非周期 SRS的子帧属于小区可能发送周期 SRS的子帧范围。
实施例 5 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 11中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 5 , 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽不相同(在本实施例中为周期 SRS 带宽的两倍) , 且非周期 SRS 的频域起始位置与前一个已发送的周期 SRS 的频域起始位置相同, 即与无线帧 m子帧 0上周期 SRS的频域起始位置相 同, 且在有非周期 SRS后, 无线帧 m子帧 0上周期 SRS的频域起始位置不 变。 发送该非周期 SRS的子帧属于小区可能发送周期 SRS的子帧范围。
实施例 6 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 12中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 5 , 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 在该非周期 SRS之后即将发送的周期 SRS由于该非周期 SRS的发送, 频域位置发生变化。 原本应在 " , 所示位置发送的周期 SRS, 经 UE重新计 算后, 实际发送位置见 " , , 且周期 SRS的频域带宽不变。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽不相同(在本实施例中为周期 SRS 带宽的两倍), 且非周期 SRS的频域起始位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1子帧 0上周期 SRS的频域起始位置 相同, 且在有非周期 SRS后, 无线帧 m+1子帧 0上周期 SRS的频域起始位 置与下一个周期 SRS的频域起始位置相同, 即与无线帧 m+2上的周期 SRS 的频域起始位置相同, 且以此类推。 发送该非周期 SRS的子帧属于小区可能 发送周期 SRS的子帧范围。
实施例 7
以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 13中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 4, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽相同, 且非周期 SRS的频域起始 位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1 子帧 0上周期 SRS的频域起始位置相同,且在有非周期 SRS后,无线帧 m+1 子帧 0上周期 SRS的频域起始位置不变。 发送该非周期 SRS的子帧不属于 小区可能发送周期 SRS的子帧范围。
实施例 8
以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 14中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 4, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽相同, 且非周期 SRS的频域起始 位置与前一个已发送的周期 SRS的频域起始位置相同,即与无线帧 m子帧 0 上周期 SRS的频域起始位置相同, 且在有非周期 SRS后, 无线帧 m子帧 0 上周期 SRS的频域起始位置不变。 发送该非周期 SRS的子帧不属于小区可 能发送周期 SRS的子帧范围。
实施例 9 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 15中 "I" 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 4, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 在该非周期 SRS之后即将发送的周期 SRS由于该非周期 SRS的发送, 频域位置发生变化。 原本应在 " , 所示位置发送的周期 SRS, 经 UE重新计 算后, 实际发送位置见 " , 。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽相同, 且非周期 SRS的频域起始 位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1 子帧 0上周期 SRS的频域起始位置相同,且在有非周期 SRS后,无线帧 m+1 子帧 0上周期 SRS的频域起始位置与下一个周期 SRS的频域起始位置相同, 即与无线帧 m+2上的周期 SRS的频域起始位置相同, 且以此类推。 发送该 非周期 SRS的子帧不属于小区可能发送周期 SRS的子帧范围。
实施例 10 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 16中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 4, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽不相同(在本实施例中为周期 SRS 带宽的两倍) , 且非周期 SRS 的频域起始位置与下一个即将发送周期 SRS 的频域起始位置相同, 即与无线帧 m+1子帧 0上周期 SRS的频域起始位置 相同, 且在有非周期 SRS后, 无线帧 m+1子帧 0上周期 SRS的频域起始位 置不变。 发送该非周期 SRS的子帧不属于小区可能发送周期 SRS的子帧范 围。
实施例 11 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 17中 " , 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 4, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 且该非周期 SRS 对后面即将发送的周期 SRS没有影响。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽不相同(在本实施例中为周期 SRS 带宽的两倍) , 且非周期 SRS 的频域起始位置与前一个已发送的周期 SRS 的频域起始位置相同, 即与无线帧 m子帧 0上周期 SRS的频域起始位置相 同, 且在有非周期 SRS后, 无线帧 m子帧 0上周期 SRS的频域起始位置不 变。 发送该非周期 SRS的子帧不属于小区可能发送周期 SRS的子帧范围。
实施例 12 以 FDD系统为例,周期 SRS的 cell-specific周期和子帧偏移配置为 7(即 表 5中的配置 7 ) 。 UE1的 UE specific的 SRS周期和子帧偏移配置为 7 , 则 周期 SRS的发送时刻如图 18中 "I" 位置所示。 基站在下行无线帧 m 的子帧 1 (在所有无线帧内的子帧编号为 x=10*m+l ) , 使用下行控制信令触发一个上行子帧上的非周期 SRS; UE收 到所述下行控制信令后, 在上行无线帧 m的子帧 4, 即图中 "圍" 所示时域 位置, 使用预先配置的非周期 SRS资源发送非周期 SRS。 在该非周期 SRS之后即将发送的周期 SRS由于该非周期 SRS的发送, 频域位置发生变化。 原本应在 所示位置发送的周期 SRS, 经 UE重新计 算后, 实际发送位置见 "I" , 且周期 SRS的频域带宽不变。 所述预先配置的非周期 SRS资源时频配置包括: 非周期 SRS的带宽与周期 SRS的带宽不相同(在本实施例中为周期 SRS 带宽的两倍), 且非周期 SRS的频域起始位置与下一个即将发送的周期 SRS 的频域起始位置相同, 即与无线帧 m+1子帧 0上周期 SRS的频域起始位置 相同, 且在有非周期 SRS后, 无线帧 m+1子帧 0上周期 SRS的频域起始位 置与下一个周期 SRS的频域起始位置相同, 即与无线帧 m+2上的周期 SRS 的频域起始位置相同, 且以此类推。 发送该非周期 SRS的子帧不属于小区可 能发送周期 SRS的子帧范围。
当基站通过下行控制信令触发多个(例如两个)非周期 SRS时, 可基于 周期跳频规则得到第二个非周期 SRS和后续周期 SRS的频域起始位置, 分 别参见图 19和 20。
本实施例还提供了一种高级长期演进(LTE-A ) 系统中的基站, 该基站 包括: 发送模块,其设置为:通过下行控制信令触发一个或多个用户设备(UE ) 在一个或多个上行子帧上发送非周期测量参考信号 (SRS ) , 以使所述 UE 在接收到基站发送的下行控制信令后, 根据基站的触发在所述上行子帧上使 用非周期 SRS资源发送非周期 SRS。
本实施例还提供了一种高级长期演进(LTE-A ) 系统中的用户设备, 所 述用户设备包括: 接收模块, 其设置为: 接收基站用于触发所述用户设备在一个或多个上 行子帧上发送非周期测量参考信号 (SRS ) 的下行控制信令; 以及 发送模块, 其设置为: 接收到基站发送的下行控制信令后, 根据基站的 触发在所述上行子帧上使用非周期 SRS资源发送非周期 SRS。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。
工业实用性 本发明提供的非周期 SRS配置方法和系统, 可以确定非周期 SRS所使 用的资源, 能够提高 UE信道测量频率, 更好的满足 LTE-A系统对信道测量 的要求。 另外, 通过预留非周期 SRS资源, 可以有效的避免在 LTE-A系统 中周期和非周期 SRS的影响和冲突。

Claims

权 利 要 求 书
1、 一种高级长期演进(LTE-A )系统中测量参考信号的配置方法, 该方 法包括: 基站通过下行控制信令触发一个或多个用户设备 ( UE )在一个或多个上 行子帧上发送非周期测量参考信号 (SRS ) 。
2、 如权利要求 1所述的方法, 其中, 所述上行子帧的数量由基站通过高层信令或物理层信令通知 UE或所述 上行子帧的数量由基站与 UE约定。
3、 如权利要求 1所述的方法, 其还包括, 所述 UE接收到基站发送的下行控制信令后, 根据基站的触发在所述上 行子帧上使用非周期 SRS资源发送非周期 SRS。
4、 如权利要求 1或 3所述的方法, 其中, 所述上行子帧中的第一个子帧为: 基站与 UE预先约定的子帧, 或者为 基站通过发送下行控制信令的下行子帧隐含通知 UE的子帧, 或为基站通过 下行控制信令通知 UE的子帧。
5、 如权利要求 4所述的方法, 其中, 当所述上行子帧有多个时, 除上行子帧中的第一个子帧之外的其余上行 子帧为基站与 UE预先约定的子帧或由基站通过下行控制信令通知 UE的子 帧。
6、 如权利要求 4所述的方法, 其中, 所述基站通过发送下行控制信令的下行子帧隐含通知所述 UE的所述上 行子帧中的第一个子帧是指:
UE预先获知偏移量 A, 设基站在下行无线帧 m中的下行子帧 X中发送 下行控制信令, 则 UE在对应的上行无线帧 n中的上行子帧 y上发送第一个 所述上行子帧上的非周期 SRS, 其中 0<=A<=320。
7、 如权利要求 3所述的方法, 其中, 所述上行子帧属于周期 SRS的小区专有( cell specific )周期及子帧偏移 所规定的子帧范围。
8、 如权利要求 3所述的方法, 其中, 所述 UE在所述上行子帧的最后一个单载波频分复用( SC-FDMA )符号 上发送所述非周期 SRS。
9、 如权利要求 3所述的方法, 其中, 基站触发 UE在一个上行子帧上发送非周期 SRS时, 所述 UE发送非周 期 SRS的频域位置由与频域有关的配置决定,所述与频域有关的配置由基站 与 UE约定, 或者基站通过下行控制信令将所述与频域有关的配置的部分或 全部发送给 UE, 所述与频域有关的配置包括发送非周期 SRS的频域带宽和 频域起始位置; 基站触发 UE在多个上行子帧上发送非周期 SRS时, 所述 UE发送非周 期 SRS的多个子帧的频域位置由与频域有关的配置决定,所述与频域有关的 配置全部由基站与 UE约定, 或者基站通过下行控制信令将所有上行子帧的 与频域有关的配置发送给 UE, 或者基站与 UE约定部分上行子帧的配置, 另 一部分上行子帧的配置通过下行控制信令发送给 UE, 所述与频域有关的配 置包括发送非周期 SRS的频域带宽和频域起始位置。
10、 如权利要求 9所述的方法, 其中, 所述非周期 SRS的带宽与所述 UE发送周期 SRS的带宽相同。
11、 如权利要求 9所述的方法, 其中, 所述上行子帧中第一个子帧上的非周期 SRS的频域起始位置与所述 UE 在某时刻发送周期 SRS的频域起始位置相同。
12、 如权利要求 11所述的方法, 其中, 所述上行子帧中第一个子帧上的所述非周期 SRS 的频域起始位置与下 一个即将发送的周期 SRS的频域起始位置相同,或者与前一个已发送的周期 SRS的频域起始位置相同。
13、 如权利要求 11或 12所述的方法, 其中, 基站触发 UE在多个上行子帧上发送非周期 SRS时, 除所述上行子帧中 第一个上行子帧外,其余上行子帧中的非周期 SRS的频域起始位置与所述第 一个上行子帧上的非周期 SRS的频域起始位置相同; 或者根据周期 SRS的 跳频规则计算得到。
14、 如权利要求 11或 12所述的方法, 其中, 所述非周期 SRS之后的周期 SRS的频域起始位置不受非周期 SRS的影 响, 或者 UE以所述上行子帧中第一个上行子帧上的非周期 SRS的频域位置 为起始, 结合周期 SRS的跳频规则, 计算之后每个周期 SRS和 /或由同一个 下行控制信令触发的非周期 SRS的频域起始位置。
15、 如权利要求 3所述的方法, 其中, 所述 UE在发送非周期 SRS 的步骤之前, 所述方法还包括: 如果所述 UE判断在所述上行子帧上还有周期 SRS需要发送, 则所述 UE选择发送: 周期 SRS和 /或非周期 SRS。
16、 如权利要求 1所述的方法, 其中, 所述基站为非周期 SRS预留资源, 一个所述预留资源被一个或多个 UE 使用, 所述基站向 UE预先配置以下资源的一种或几种作为非周期 SRS预留 资源: 码资源、 频域资源、 以及时域资源; 所述基站通过配置 SRS根序列和 /或序列的循环移位,使 UE获知预留的 码资源; 所述基站通过配置梳(Comb )信息和 /或频带信息, 使 UE获知预 留的频域资源, 其中所述频带信息包括频域起点和带宽; 所述基站通过配置 发送非周期 SRS的子帧, 使 UE获知预留的时域资源。
17、 如权利要求 16所述的方法, 其中, 所述基站通过无线资源控制层信令指示预留的用于非周期 SRS 发送的 资源。
18、 如权利要求 1所述的方法, 其中, 所述下行控制信令为物理层信令; 所述物理层信令为物理下行控制信道 中的信令。
19、 一种高级长期演进(LTE-A ) 系统中的基站, 所述基站包括: 发送模块,其设置为:通过下行控制信令触发一个或多个用户设备(UE ) 在一个或多个上行子帧上发送非周期测量参考信号 (SRS ) , 以使所述 UE 在接收到基站发送的下行控制信令后, 根据基站的触发在所述上行子帧上使 用非周期 SRS资源发送非周期 SRS。
20、 一种高级长期演进(LTE-A ) 系统中的用户设备, 所述用户设备包 括: 接收模块, 其设置为: 接收基站用于触发所述用户设备在一个或多个上 行子帧上发送非周期测量参考信号 (SRS ) 的下行控制信令; 以及 发送模块, 其设置为: 接收到基站发送的下行控制信令后, 根据基站的 触发在所述上行子帧上使用非周期 SRS资源发送非周期 SRS。
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