WO2011097995A1 - Srs信号发送方法及其触发方法以及设备 - Google Patents

Srs信号发送方法及其触发方法以及设备 Download PDF

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Publication number
WO2011097995A1
WO2011097995A1 PCT/CN2011/070723 CN2011070723W WO2011097995A1 WO 2011097995 A1 WO2011097995 A1 WO 2011097995A1 CN 2011070723 W CN2011070723 W CN 2011070723W WO 2011097995 A1 WO2011097995 A1 WO 2011097995A1
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Prior art keywords
srs
user equipment
srs signal
send
base station
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PCT/CN2011/070723
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English (en)
French (fr)
Inventor
潘学明
缪德山
陈文洪
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电信科学技术研究院
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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Priority to US13/578,600 priority Critical patent/US20130039304A1/en
Priority to EP11741866.5A priority patent/EP2552169B1/en
Publication of WO2011097995A1 publication Critical patent/WO2011097995A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method for transmitting a trigger SRS (uplink sounding pilot signal), a method for transmitting an SRS signal, and a device.
  • a trigger SRS uplink sounding pilot signal
  • SRS uplink sounding pilot signal
  • the uplink MIMO Mult-Input Mult-Output
  • CQI Channel Quality Indicator
  • the estimation and uplink precoding selection needs to support the UE (User Equipment, User Equipment) to perform uplink sounding reference signal (SRS) transmission independently in multiple antennas.
  • the SRS resources are periodically configured, and the SRS signals of each UE are periodically sent, and their transmission parameters (such as period, subframe, frequency band, and frequency hopping configuration) It is configured by high-level signaling RRC (Radio Resource Control) information, and the UE starts to send an SRS signal after receiving an instruction from the base station.
  • RRC Radio Resource Control
  • the UE Before the UE receives the SRS signal, the UE performs the SRS signal transmission directly, so the SRS signal configuration is slowly changed.
  • the SRS signal can be dynamically configured, that is, configured by PDCCH (Physical Downlink Control Channel) (dedicated control channel) signaling.
  • PDCCH Physical Downlink Control Channel
  • a typical way is to increase the 1-bit trigger SRS signal transmission when the UE performs uplink scheduling, or send one independently.
  • the PDCCH signaling indicates that the UE performs SRS signal transmission.
  • the SRS configuration parameter is configured by higher layer signaling, and the PDCCH signaling is only a trigger for performing SRS transmission; the latter, the SRS configuration parameter is directly set in the PDCCH indication. Both of these methods are independent configuration of the UE.
  • the PDCCH signaling is used to trigger a single user equipment to send an SRS signal, and the system overhead is large. Especially when there are many UEs that need to be triggered by the SRS transmission in this manner, the downlink control PDCCH signaling needs a large amount of cost;
  • the resource configuration of the UE may be easily conflicted with other users when the SRS signal is actually sent. Even if the collision can be avoided, the scheduling will be very high. Great limit. Summary of the invention
  • the embodiment of the present invention provides a method for triggering SRS signal transmission and a corresponding method for transmitting SRS signals, and a corresponding device, which is used to solve the problem that the existing SRS signal transmission mechanism cannot indicate that multiple user equipments transmit SRS signals at one time.
  • An embodiment of the present invention provides a method and a device for triggering SRS signal transmission, which are used to enable a user equipment to send an SRS signal by using downlink transmission scheduling signaling.
  • the method for triggering the sending of the SRS signal includes: the base station sends the downlink transmission scheduling signaling to the user equipment, where the indication information indicating the user equipment to send the SRS signal is carried.
  • a sending module configured to send downlink transmission scheduling signaling to the user equipment, where the indication information for indicating that the user equipment sends an SRS signal is carried.
  • the downlink transmission scheduling signaling is used to indicate that the user equipment sends the SRS signal, so that the user equipment can send the uplink SRS signal when performing downlink transmission, which is beneficial to better support beamforming, downlink non-codebook, and the like.
  • Transmission method because this The transmission mode needs to utilize the uplink and downlink channel reciprocity, and the uplink channel information of the user equipment can be obtained by the base station side of the uplink SRS signal.
  • the method for triggering the SRS signal transmission includes: the base station sends a dedicated control channel PDCCH signaling, where the identifier information corresponding to multiple user equipments is carried, and the SRS corresponding to the multiple user equipments respectively Sending indication information, where the SRS transmission indication information is used to indicate whether the corresponding user equipment sends an SRS signal.
  • a sending module configured to send PDCCH signaling, where the identifier information corresponding to the multiple user equipments, and the SRS sending indication information corresponding to the multiple user equipment identifiers, where the SRS sending indication information is used to indicate the corresponding Whether the user equipment sends an SRS signal.
  • the PDCCH signaling receives, by the user equipment corresponding to the identifier information corresponding to the multiple user equipments in the PDCCH signaling, the PDCCH signaling, where the PDCCH signaling includes SRS sending indication information corresponding to the user equipment;
  • the user equipment sends an SRS signal.
  • a receiving module configured to receive the PDCCH signaling when the user equipment is a user equipment corresponding to the identifier information corresponding to the multiple user equipments in the PDCCH signaling, where the PDCCH signaling includes the user
  • the SRS is sent by the device, and the sending module is configured to send, when the SRS sending indication information in the PDCCH signaling received by the receiving module, the SRS signal is sent by the user equipment.
  • the base station carries the identifier information corresponding to the multiple user equipments and the SRS sending indication corresponding to each user equipment in the PDCCH signaling that is sent by the base station, so that the identifier can be indicated at one time.
  • a plurality of user equipments corresponding to the information transmit an SRS signal.
  • the instructed user equipment may trigger the sending process of the SRS signal according to the SRS sending indication carried therein.
  • FIG. 1 is a schematic flowchart of triggering SRS signal transmission and transmitting an SRS signal according to an embodiment of the present invention
  • FIG. 2 and FIG. 3 are schematic diagrams respectively showing configuration parameters of a subframe used for transmitting an SRS signal in a TDD system according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a base station device according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of trigger SRS signal transmission according to an embodiment of the present invention
  • a schematic diagram of the process of transmitting an SRS signal
  • FIG. 7 is a schematic structural diagram of a base station device according to an embodiment of the present invention. detailed description
  • the uplink SRS signal is sent.
  • the aperiodic mode can be adopted, that is, a trigger signal is sent by the base station to enable the UE to perform SRS signal transmission.
  • a plurality of UEs may be sent to transmit the SRS signal by sending a control signaling.
  • FIG. 1 is a flowchart of a method for transmitting a SRS signal by a base station according to the embodiment, and a process for the user equipment to be triggered to send an SRS signal, where the SRS configuration parameter may be configured in advance by the high layer signaling to the user equipment, and the configuration parameter may include a corresponding Information such as signal sequence and band information.
  • the process can include:
  • Step 101 Determine a user equipment that needs to send an SRS signal.
  • the upper layer may determine, according to the service requirement of each user equipment or the data transmission mode, which one or which user equipments need to send SRS signals, and determine the identifiers of the user equipments.
  • the determined user equipment that needs to send the SRS signal may be multiple (such as a group).
  • Step 102 The base station sends PDCCH signaling, where the identifier corresponding to the group of user equipments is carried, where the identifier corresponds to a group of user equipments that need to send SRS signals determined by step 101, and each of the group user equipments is corresponding.
  • Each user equipment is provided with an SRS signal transmission indication identifier, and sends an indication identifier value through different SRS signals to indicate whether the user equipment is required to transmit the SRS signal.
  • the SRS signal transmission indication identifier carried in the PDCCH signaling may be an identifier of 1 bit length, so as to reduce the overhead of PDCCH signaling. If a 1-bit length identifier is used, a value of 0 can be defined to indicate that the user equipment is required to transmit the SRS signal, and a value of 1 indicates that the user equipment is not required to transmit the SRS signal, and vice versa.
  • the user equipment receives the PDCCH signaling in a blind detection mode, that is, the user equipment generally does not know what format (format) information is transmitted by the current DCI (downlink control information), and does not know that it needs to Where is the information?
  • the user equipment knows what information it is currently expecting, for example, it may currently expect SRS to send indication information.
  • the user equipment uses the corresponding X-RNTI (Radio Network Temporary Identity)
  • the CCE Control Channel Element, the basic unit carrying the DCI
  • CRC Cyclic Redundancy Check
  • the base station may use the SRS-RNTI as the ID number of the PDCCH signaling to indicate that the PDCCH signaling of the group of user equipments is used to indicate that the user equipment sends the SRS, thereby improving the blindness of the user equipment to the PDCCH.
  • the SRS-RNTI can correspond to a group of user equipments.
  • the base station uses the common search space to send the PDCCH signaling for indicating that the user equipment sends the SRS, so that the user equipment detects the PDCCH signaling in the common search space, so as to reduce the complexity of the user blind detection.
  • the base station may construct the PDCCH signaling for indicating that the user equipment sends the SRS signal according to the length of the existing PDCCH signaling.
  • the effective information bit of the DCI is 20 bits, and 20 users can be supported.
  • the index (user identifier) of 20 users respectively corresponds to one of the sequence numbers 1-20, and the information bit corresponding to each sequence number can be 1 or 0, 1
  • the representative triggers the user to send an SRS signal, and 0 means that the user is not triggered to transmit the SRS signal.
  • the UE may first perform CRC check on the DCI information, and the check information and the SRS-RNTI perform XOR to generate a new check digit, and the valid information bit and the check digit jointly form the last information of the DCI. Bit, channel coding, data mapping transmission.
  • the user equipment triggers the SRS signal sending process according to the PDCCH signaling sent by the base station, including:
  • Step 103 The user equipment monitors the PDCCH at a predetermined time, and if the SRS network identifier corresponding to the user is read, the PDCCH signaling is interpreted.
  • step 104 corresponding to the manner in which the base station sends PDCCH signaling, when the user equipment blindly detects the PDCCH, it detects whether the signaling ID is SRS-RNTI in the common search area. PDCCH signaling, if any, then step 104 is performed.
  • one of a group of user equipments identified by the SRS-RNTI in the PDCCH signaling is used as an example.
  • Step 104 The user equipment parses the received PDCCH signaling, and reads an SRS indication identifier corresponding to the user equipment identifier carried therein.
  • Step 105 If the value of the SRS indication identifier indicates that the user equipment is required to send the SRS signal, go to step 106, otherwise go to step 107.
  • Step 106 The user equipment sends an SRS signal according to an SRS configuration parameter that is pre-configured to the user equipment.
  • Step 107 The user equipment does not perform SRS signal transmission.
  • the user equipment may send the SRS signal according to the resource reserved by the system for sending the SRS signal.
  • the base station may perform user grouping according to the service condition and transmission mode of each user, and perform resource allocation, and then notify each user equipment by using high layer signaling.
  • the system is the PDCCH signal.
  • the resources reserved by the indicated group of user equipments are orthogonal to each other.
  • the user equipment may send the SRS signal according to the timing specified by the system. For example, after receiving the PDCCH in the nth subframe, the user transmits the SRS signal in the kth subframe after the specified subframe.
  • k can be specified by the protocol, the value of k is: On the one hand, try to ensure that the user equipment receives and parses the delay of the PDCCH, and the delay of processing the SRS signal that needs to be reported; on the other hand, the protocol may also specify other The location where the information is sent, so conflicts with the location where these messages are sent should be avoided as much as possible.
  • the SRS signal may be transmitted in an n+4 subframe, where n is a subframe for receiving PDCCH signaling; and for TDD (Time Division) Duplexing, time division duplex system) users need to transmit in n+k subframes, where n is the subframe receiving PDCCH signaling, and the k value may be different for different time slots.
  • Figure 2 and Figure 3 show the values of k in different time slot configurations in a TDD system.
  • the PDCCH signaling may further carry an SRS configuration parameter, so that the base station may trigger the SRS signal to be sent by multiple user equipments by using one PDCCH signaling, and may also configure the SRS signal for the user equipments.
  • the sending parameters enable the user equipments to send SRS signals according to the sending parameters, thereby realizing dynamic configuration of SRS configuration parameters.
  • the embodiment of the present invention further provides a base station device and a user equipment.
  • the base station device provided by the embodiment of the present invention may include:
  • the sending module 401 is configured to send PDCCH signaling, where the identifier information corresponding to the multiple user equipments, and the SRS sending indication information corresponding to the multiple user equipments are used, where the SRS sending indication information is used to indicate corresponding Whether the user equipment sends an SRS signal.
  • the sending module 401 can use the SRS radio network temporary identifier as the identification information corresponding to the plurality of user equipments; and can also send the PDCCH signaling in a common search space of the PDCCH channel.
  • the SRS transmission indication information sent by the sending module 401 is a 1-bit indication identifier.
  • the PDCCH signaling sent by the sending module 401 further carries SRS configuration parameters, which may include a signal sequence and frequency band information.
  • the foregoing base station may further include:
  • the resource reservation module 402 is configured to reserve, after the sending module 401 sends the PDCCH signaling, a resource for sending the SRS signal for the multiple user equipments, or separately reserved for the multiple user equipments.
  • the resources for transmitting the SRS signal are indicated to the plurality of user equipments, wherein resources respectively reserved for the plurality of user equipments may be orthogonal to each other.
  • the user equipment provided by the embodiment of the present invention may include:
  • the receiving module 501 is configured to receive the PDCCH signaling when the user equipment is the user equipment corresponding to the identifier information corresponding to the multiple user equipments in the PDCCH signaling, where the PDCCH signaling includes The SRS corresponding to the user equipment sends indication information.
  • the module may search for the PDCCH in the common search space when the PDCCH is monitored.
  • the sending module 502 is configured to send the SRS signal when the SRS sending indication information in the PDCCH signaling received by the receiving module 501 indicates that the user equipment sends the SRS signal.
  • the SRS signal may be sent according to the pre-configured SRS transmission configuration information, and the SRS signal may be sent using the resource reserved for the SRS signal sent by the user equipment.
  • the sending module 502 may receive the PDCCH signaling sub- The SRS signal is transmitted in the nth subframe after the frame, where n is the default setting, as shown in FIG. 2 and FIG. 3.
  • the base station carries the SRS transmission indication corresponding to the multiple user equipments in the transmitted PDCCH signaling, so that multiple user equipments can be instructed to send the SRS signal by one PDCCH signaling at a time.
  • the indicated user equipment may trigger the sending process of the SRS signal according to the SRS sending indication carried therein. It can be seen that the foregoing embodiment implements the effect that one PDCCH signaling triggers multiple user equipments to send SRS signals.
  • the network side may configure the SRS configuration parameter to the user equipment in advance.
  • the downlink transmission scheduling signaling may be sent to the user equipment, and the signaling is used to indicate the user equipment. Send the SRS signal.
  • the SRS signal sending process provided in this embodiment may include: Step 601: A base station schedules downlink resources of a user equipment, and sends downlink transmission scheduling signaling to the user equipment, and uses the signaling to indicate user equipment. Send the SRS signal.
  • Step 602 After receiving the downlink transmission scheduling signaling, the user equipment sends an SRS signal according to the indication of the signaling.
  • the manner in which the base station indicates that the user equipment sends the SRS signal by using the downlink transmission scheduling signaling may adopt an explicit indication manner or an implicit indication manner.
  • the base station may carry the finger in the downlink transmission signaling.
  • the indication information may be an indication identifier of a 1-bit length, and the system specifies a specific meaning of the indication identifier value. For example, when the indication identifier is 1, it indicates that the user equipment is required to send an SRS signal, where the indication identifier is When 0, it means that the user equipment is not required to send the SRS signal.
  • an indication identifier for indicating that the user equipment sends the SRS signal may be carried in the DL grant (downlink scheduling signaling).
  • the system may pre-agreed, using other information that may be carried in the downlink transmission scheduling signaling, or a combination of other information to indicate whether the user equipment is required to transmit the SRS signal. For example, the information bit of the LVRB/DVRB (Localized Virtual Resource Block/Distributed Virtual Resource Block) triggers the SRS signal. If the information bit indicates the LVRB, the SRS transmission is triggered. Otherwise, Do not trigger.
  • LVRB/DVRB Localized Virtual Resource Block/Distributed Virtual Resource Block
  • the downlink transmission scheduling signaling may adopt a format that is different from the existing PDCCH format length.
  • an embodiment of the present invention further provides a base station device.
  • the base station may include:
  • the sending module 701 is configured to send downlink transmission scheduling signaling to the user equipment, where the indication information for indicating that the user equipment sends the SRS signal is carried.
  • the indication information sent by the sending module 701 is a 1-bit indication identifier.
  • the indication information sent by the sending module 701 may also be an information bit of the LVRB/DVRB, and if the information bit indicates the LVRB, it indicates that the user equipment is sent to send the SRS signal.
  • the downlink transmission scheduling signaling indicates that the user equipment sends the SRS signal, so that the user equipment can send the uplink SRS signal when performing downlink transmission, which is beneficial to better support beamforming, downlink non-codebook transmission, etc. the way.
  • the uplink scheduling signaling is used to trigger the user equipment to send an SRS signal, and the uplink scheduling signaling cannot be used for downlink transmission by the user.
  • a software product is stored in a storage medium, including instructions for causing a terminal device (which may be a cell phone, a personal computer, a server, or a network device, etc.) to perform various embodiments of the present invention. The method described.

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Abstract

本发明公开了触发SRS信号发送的方法、SRS信号发送方法及其相关设备,该触发SRS信号发送的方法包括:基站向用户设备发送下行传输调度信令,其中携带用于指示所述用户设备发送SRS信号的指示信息。采用本发明,可以通过了一条PDCCH信令触发一个或多个用户设备发送SRS信号。

Description

SRS信号发送方法及其触发方法以及设备 本申请要求于 2010年 2 月 11 日提交中国专利局, 申请号为 201010111748.0, 发明名称为 "SRS信号发送方法及其触发方法以及 设备"的中国专利申请的优先权, 其全部内容通过引用结合在本申请 中。 技术领域
本发明涉及无线通信技术领域, 特别是涉及触发 SRS (上行探测 导频信号) 的发送方法、 SRS信号的发送方法及设备。 背景技术
在 LTE-A ( Long Term Evolution- Advanced ) 系统中, 由于上行 MIMO ( Mult-Input Mult-Output, 多输入多输出) 支持多天线传输, 为了更好的进行 CQI ( Channel Quality Indicator, 信道质量指示符) 估计和上行预编码选择, 需要支持 UE ( User Equipment, 用户设备 ) 能在多天线独立的进行上行探测导频信号 ( Sounding Reference Signals, SRS ) 的传输。
在 REL-8 ( Rdease-8, 版本 8 )系统中, SRS资源是周期配置的, 每个 UE的 SRS信号是周期性发送的, 其发送参数(如周期、 子帧、 频带、 跳频配置)是高层信令 RRC ( Radio Resource Control, 无线资 源控制)信息配置的, UE接收到基站的指令后开始发送 SRS信号。 在 UE没有收到 SRS信号关闭之前, UE—直进行 SRS信号发送, 因 此 SRS信号配置是慢变的。
随着在 LTE-A系统中对 SRS资源的更多需求, 单纯的半静态配 置已不能满足需求。 因此, 业界提出 SRS信号可以进行动态配置, 即通过 PDCCH ( Physical Downlink Control Channel,物理下行链路控 制信道)(专用控制信道)信令进行配置。 一种典型的方式是对 UE 进行上行调度时增加 1 比特触发 SRS信号发送, 也可以独立发送一 条 PDCCH信令指示 UE进行 SRS信号发送。 前者, SRS配置参数是 由高层信令配置, PDCCH信令只是进行 SRS发送的触发;后者, SRS 配置参数直接在 PDCCH指示中设定。 这两种方式都是对 UE进行独 立的配置。
考虑到系统的可实现性和效率, 在实现本发明的过程中, 发明人 发现现有技术至少存在如下问题:
一方面,使用 PDCCH信令触发单个用户设备发送 SRS信号的方 式, 系统开销较大, 尤其当需要采用这种方式进行 SRS发送触发的 UE较多时, 下行控制 PDCCH信令需要很大的耗费;
另一方面,采用上行调度信令对 UE进行 SRS触发的方式,会使 UE实际发送 SRS信号的时候, 其资源配置容易和其他用户产生相互 沖突, 即使能够避免碰撞, 但在调度上会受到很大限制。 发明内容
本发明的实施例提供了一种触发 SRS信号发送的方法和相应的 SRS信号发送的方法以及相应设备, 用以解决现有 SRS信号发送机 制不能一次指示多个用户设备发送 SRS信号的问题。
本发明的实施例提供了一种触发 SRS信号发送的方法及设备, 用以实现使用下行传输调度信令指示用户设备发送 SRS信号。
本发明实施例提供的触发 SRS信号发送的方法, 包括: 基站向用户设备发送下行传输调度信令,其中携带用于指示所述 用户设备发送 SRS信号的指示信息。
本发明实施例提供的基站, 包括:
发送模块, 用于向用户设备发送下行传输调度信令, 其中携带用 于指示所述用户设备发送 SRS信号的指示信息。
本发明的上述实施例,由于采用下行传输调度信令指示用户设备 发送 SRS信号, 使得用户设备在进行下行传输时可以发送上行 SRS 信号, 有利于更好的支持波束赋形、 下行非码本等传输方式, 因为这 些传输方式需要利用上下行信道互易性, 通过上行 SRS信号基站侧 能获得用户设备的上行信道信息。
本发明实施例提供的触发 SRS信号发送的方法, 包括: 基站发送专用控制信道 PDCCH信令, 其中携带与多个用户设备 对应的标识信息, 以及分别与所述多个用户设备——对应的 SRS发 送指示信息, 所述 SRS发送指示信息用于指示相应的用户设备是否 发送 SRS信号。
本发明实施例提供的基站, 包括:
发送模块, 用于发送 PDCCH信令, 其中携带与多个用户设备对 应的标识信息, 以及与所述多个用户设备标识——对应的 SRS发送 指示信息, 所述 SRS发送指示信息用于指示相应的用户设备是否发 送 SRS信号。
本发明实施例提供的 SRS信号发送方法, 包括:
与 PDCCH信令中的所述与多个用户设备对应的标识信息所对应 的用户设备, 接收该 PDCCH信令, 所述 PDCCH信令中包含与所述 用户设备对应的 SRS发送指示信息;
如果所述 SRS发送指示信息指示用户设备发送 SRS信号, 则所 述用户设备发送 SRS信号。
本发明实施例提供的用户设备, 包括:
接收模块, 用于在用户设备是与 PDCCH信令中的所述与多个用 户设备对应的标识信息所对应的用户设备时, 接收该 PDCCH信令, 所述 PDCCH信令中包含与所述用户设备对应的 SRS发送指示信息; 发送模块, 用于在所述接收模块接收到的 PDCCH信令中的所述 SRS发送指示信息指示用户设备发送 SRS信号时发送 SRS信号。
本发明的以上实施例中, 由于基站在发送的 PDCCH信令中携带 了与多个用户设备对应的标识信息, 以及与各用户设备——对应的 SRS发送指示,从而能够一次指示与所述标识信息对应的多个用户设 备发送 SRS信号。相应的,被指示的用户设备在接收到该 PDCCH信 令后,可以根据其中携带的 SRS发送指示触发 SRS信号的发送过程。 可以看出, 以上实施例实现了一条 PDCCH信令触发多个用户设备发 送 SRS信号的效果。 当然, 实施本发明的实施例的任一产品并不一 定需要同时达到以上所述的所有优点。 附图说明
为了更清楚地说明本发明或现有技术中的技术方案,下面将对本 发明或现有技术描述中所需要使用的附图作筒单的介绍, 显而易见 地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本领域普通 技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图 获得其他的附图。
图 1为本发明的一实施例提供的触发 SRS信号发送以及发送 SRS 信号的流程示意图;
图 2和图 3分别为本发明实施例提供的 TDD系统下的传输 SRS 信号所用子帧的配置参数示意图;
图 4为本发明的一实施例提供的基站设备的结构示意图; 图 5为本发明的一实施例提供的用户设备的结构示意图; 图 6为本发明的一实施例提供的触发 SRS信号发送以及发送 SRS 信号的流程示意图;
图 7为本发明的一实施例提供的基站设备的结构示意图。 具体实施方式
下面将结合本发明中的附图, 对本发明中的技术方案进行清楚、 完整的描述, 显然, 所描述的实施例是本发明的一部分实施例, 而不 是全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没 有做出创造性劳动的前提下所获得的所有其他实施例,都属于本发明 保护的范围。
实施例一
本实施例为了緩解 SRS资源容量受限情况, 上行 SRS信号发送 可以采用非周期方式, 即由基站发送一个触发信号使得 UE能够进行 SRS信号发送。 另外, 可以采用发送一条控制信令指示多个 UE进行 SRS信号的发送。
图 1示出了本实施例所提供的基站触发 SRS信号发送的流程以 及用户设备被触发发送 SRS信号的流程, 其中, SRS配置参数可由 高层信令事先配置到用户设备, 配置参数可以包括对应的信号序列、 频带信息等信息。 该流程可以包括:
步骤 101、 确定需要发送 SRS信号的用户设备。
该步骤中, 可由高层根据各用户设备的业务需求或数据传输模 式, 确定那个或哪些用户设备需要发送 SRS信号, 并确定出这些用 户设备的标识。 确定出的需要发送 SRS信号的用户设备可以是多个 (如一组 )。
步骤 102、 基站发送 PDCCH信令, 其中携带与该组用户设备所 对应的标识, 该标识对应由步骤 101 所确定出的一组需要发送 SRS 信号的用户设备, 并且对应该组用户设备中的每个用户设备, 都设置 有一个 SRS信号发送指示标识, 并通过不同的 SRS信号发送指示标 识值来表示是否要求用户设备发送 SRS信号。
PDCCH信令中所携带的 SRS信号发送指示标识可以是 1比特长 度的标识, 以便减少 PDCCH信令的开销。 如果采用 1比特长度的标 识, 则可以定义值为 0表示要求用户设备发送 SRS信号, 值为 1表 示不要求用户设备发送 SRS信号, 反之亦然。
至此, 完成了通过一条 PDCCH信令指示多个用户设备(如一组 用户设备)发送 SRS信号的流程。
考虑到用户设备接收 PDCCH信令是采用盲检方式, 即用户设备 一般不 口道当前 DCI ( Downlink Control Information, 下行链路控制 信息)传送的是什么 format (格式)的信息, 也不知道自己需要的信 息在哪个位置。但是用户设备知道自己当前在期待什么信息, 例如当 前可能期待 SRS发送指示信息。 对于不同的期望信息用户设备用相 应的 X-RNTI ( Radio Network Temporary Identity , 无线网络临时标识 符)去和 CCE ( Control Channel Element, 即承载 DCI的基本单元) 信息做 CRC ( Cyclic Redundancy Check, 循环冗余校验)校验, 如果 CRC校验成功, 那么用户设备就知道这个信息是自己需要的, 也知 道相应的 DCI format,从而进一步解出 DCI内容。因此,本实施例中, 基站可以使用 SRS-RNTI作为 PDCCH信令的 ID号, 以指示一组用 户设备该条 PDCCH信令是用于指示用户设备发送 SRS的,从而提高 用户设备对 PDCCH的盲检效率。 其中, SRS-RNTI可以对应一组用 户设备。
考虑到 PDCCH的空间可以被划分为公共搜索空间和特定搜索空 间, 以提高用户设备的盲检效率。 本实施例中, 基站使用公共搜索空 间发送该用于指示用户设备发送 SRS的 PDCCH信令,以使用户设备 在公共搜索空间检测该 PDCCH信令, 以降低用户盲检的复杂度。
进一步的, 为了减少盲检次数, 本实施例中, 基站可以根据现有 PDCCH 信令的长度构造该用于指示用户设备发送 SRS 信号的 PDCCH信令。
一种典型的 PDCCH DCI格式示例如下:
假设该 DCI的有效信息位是 20bit, 可以支持 20个用户, 20个 用户的 index (用户标识 )分别对应于序号 1 _ 20中的一个, 每个序 号对应的信息位可以为 1或者 0, 1代表触发该用户发送 SRS信号, 0代表不触发该用户发送 SRS信号。 UE在发送该 DCI信息时, 可以 先对该 DCI信息进行 CRC校验, 校验信息和 SRS-RNTI进行异或生 成新的校验位, 有效信息位和校验位联合组成该 DCI最后的信息位, 在进行信道编码、 数据映射发送。
用户设备根据基站发送的 PDCCH信令,触发 SRS信号发送流程, 包括:
步骤 103、 用户设备在预定时刻监听 PDCCH, 如果读取到对应 于该用户的 SRS网络标识符, 则解读 PDCCH信令。
该步骤中, 对应上述基站发送 PDCCH信令的方式, 用户设备在 盲检 PDCCH时, 在公共搜索区域检测是否有信令 ID为 SRS-RNTI 的 PDCCH信令, 如果有, 则执行步骤 104。
本实施例中, 以该用户设备是 PDCCH信令中的 SRS-RNTI所标 识的一组用户设备中的一个为例进行描述。
步骤 104、 用户设备解析接收到的 PDCCH信令, 读取其中携带 的与该用户设备标识对应的 SRS指示标识。
步骤 105、如果该 SRS指示标识的值表明需要用户设备发送 SRS 信号, 则执行步骤 106, 否则执行步骤 107。
步骤 106、用户设备根据预先配置到该用户设备的 SRS配置参数 发送 SRS信号。
步骤 107、 用户设备不执行 SRS信号发送。
上述流程中, 用户设备可以根据系统为其发送 SRS信号所预留 的资源发送 SRS信号。 为了减少资源之间的沖突, 基站可根据各个 用户的业务情况和传输模式等情况,进行用户分组,并进行资源分配, 然后用高层信令通知各个用户设备, 较佳地, 系统为该 PDCCH信令 所指示的一组用户设备所预留的资源相互正交。
上述流程中, 用户设备可以按照系统规定的时序发送 SRS信号, 如用户在第 n个子帧接收到该 PDCCH之后, 在规定的其后第 k个子 帧发送 SRS信号。 k可以由协议规定, k的取值原则是: 一方面, 尽 量保证用户设备接收、解析 PDCCH的时延,以及处理需要上报的 SRS 信号的时延;另一方面,由于协议可能还指定了其他信息的发送位置, 因此应该尽量避免与这些信息发送位置的沖突。
在具体实现中, 对于 FDD ( Frequency Division Duplexing, 频分 双工系统)用户, 可以在 n+4子帧进行 SRS信号的发送, 其中, n 为接收 PDCCH信令的子帧; 对于 TDD ( Time Division Duplexing, 时分双工系统)用户则需要在 n+k个子帧进行发送, 其中, n为接收 PDCCH信令的子帧, 对于不同时隙配置 k值可以有所不同。 图 2和 图 3分别给出了 TDD系统中, 不同时隙配置下的 k的取值。
如图 2 所示, 针对不同的时隙配置 (图中的 TDD UL/DL ( Uplink/Downlink, 上行 /下行链路) Configuration ) 方式, 在接收 PDCCH信令的子帧为 DL subframe number n (下行子帧数 n )时, 表 格中的数字为 k的取值。 例如, 对于 TDD UL/DL Configuration为 0 的情况, 如果接收 PDCCH信令的子帧为子帧 0, 则 k=4; 如果接收 PDCCH信令的子帧为子帧 1 ,则 k=6,其他时隙配置下的 k的取值如 此类推。
在本发明的另一实施例中, PDCCH信令中还可以携带 SRS配置 参数,这样,基站在通过一条 PDCCH信令触发多个用户设备发送 SRS 信号的同时, 还可以为这些用户设备配置 SRS信号的发送参数, 使 这些用户设备按照该发送参数发送 SRS信号, 从而实现了 SRS配置 参数的动态配置。
基于相同的技术构思,本发明实施例还分别提供了一种基站设备 和一种用户设备。
如图 4所示, 本发明实施例提供的基站设备可以包括:
发送模块 401 , 用于发送 PDCCH信令, 其中携带与多个用户设 备对应的标识信息, 以及与所述多个用户设备——对应的 SRS发送 指示信息, 所述 SRS发送指示信息用于指示相应的用户设备是否发 送 SRS信号。
发送模块 401可使用 SRS无线网络临时标识符作为该与多个用 户设备对应的标识信息; 还可以在 PDCCH信道的公共搜索空间发送 所述 PDCCH信令。
发送模块 401所发送的 SRS发送指示信息为 1比特的指示标识。 发送模块 401所发送的 PDCCH信令中还携带 SRS配置参数,其 中可包括信号序列、 频带信息。
上述基站, 还可包括:
资源预留模块 402, 用于在发送模块 401发送所述 PDCCH信令 之前, 为所述多个用户设备分别预留发送 SRS信号的资源, 或将为 所述多个用户设备分别预留的用于发送 SRS信号的资源指示给所述 多个用户设备, 其中, 为所述多个用户设备所分别预留的资源可以相 互正交。 如图 5所示, 本发明实施例提供的用户设备可以包括:
接收模块 501 , 用于在用户设备是与 PDCCH信令中的所述与多 个用户设备对应的标识信息所对应的用户设备时, 接收该 PDCCH信 令,所述 PDCCH信令中包含与所述用户设备对应的 SRS发送指示信 息。 该模块在监听 PDCCH时, 可在公共搜索空间搜索 PDCCH; 发送模块 502, 用于在接收模块 501接收到的 PDCCH信令中的 所述 SRS发送指示信息指示用户设备发送 SRS信号时发送 SRS信号。 较佳地, 可根据预先配置的 SRS发送配置信息发送 SRS信号, 也可 使用为所述用户设备发送 SRS信号所预留的资源发送 SRS信号; 发送模块 502可在接收所述 PDCCH信令的子帧之后的第 n个子 帧发送 SRS信号, 其中, n为默认设定, 可参照图 2、 图 3所示。
根据以上描述可以看出, 由于基站在发送的 PDCCH信令中携带 了与多个用户设备——对应的 SRS 发送指示, 从而能够通过一条 PDCCH信令一次指示多个用户设备发送 SRS信号。 相应的, 被指示 的用户设备在接收到该 PDCCH信令后, 可以根据其中携带的 SRS 发送指示触发 SRS信号的发送过程。 可以看出, 以上实施例实现了 一条 PDCCH信令触发多个用户设备发送 SRS信号的效果。
实施例二
在本实施例中, 网络侧可以事先将 SRS 配置参数配置到用户设 备, 当网络侧调度某个用户设备时, 可通过向该用户设备发送下行传 输调度信令, 用该信令来指示用户设备发送 SRS信号。
如图 6所示, 本实施例所提供的 SRS信号发送流程可以包括: 步骤 601、 基站调度用户设备的下行资源, 并向该用户设备发送 下行传输调度信令, 并使用该信令指示用户设备发送 SRS信号。
步骤 602、 用户设备在接收到该下行传输调度信令后, 根据该信 令的指示发送 SRS信号。
上述流程中,基站通过下行传输调度信令指示用户设备发送 SRS 信号的方式可以采用显性指示的方式, 也可以采用隐性指示的方式。
如果采用显式指示的方式,基站可以在该下行传输信令中携带指 示用户设备发送 SRS信号的指示信息。较佳的, 该指示信息可以是 1 比特长度的指示标识, 并由系统指定该指示标识值的具体含义, 如, 当该指示标识为 1时, 表示要求用户设备发送 SRS信号, 当该指示 标识为 0时, 表示不要求用户设备发送 SRS信号。 在具体实现时, 可在 DL grant (下行调度信令) 中携带用于指示用户设备发送 SRS 信号的指示标识。
如果采用隐式指示的方式, 可以由系统事先约定, 用下行传输调 度信令中可能携带的其他信息,或者其他信息的组合来指示是否需要 用户设备发送 SRS信号。 例如, 用 LVRB/DVRB ( Localized Virtual Resource Block/ Distributed Virtual Resource Block ,集中式虚拟资源块 /分布式虚拟资源块) 的信息位指示触发 SRS信号, 如果该信息位指 示 LVRB, 则触发 SRS发送, 否则不触发。
较佳的, 为减少用户设备对下行传输调度信令的盲检次数, 该下 行传输调度信令可以采用与现有某种 PDCCH format长度的格式。
基于相同的技术构思, 本发明实施例还提供了一种基站设备。 如图 7所示, 该基站可以包括:
发送模块 701 , 用于向用户设备发送下行传输调度信令, 其中携 带用于指示所述用户设备发送 SRS信号的指示信息。 发送模块 701 发送的所述指示信息为 1比特的指示标识。发送模块 701发送的所述 指示信息还可以是 LVRB/DVRB的信息位,且若该信息位指示 LVRB, 则表示指示用户设备发送 SRS信号。
通过以上描述可以看出,通过下行传输调度信令指示用户设备发 送 SRS信号, 使得用户设备在进行下行传输时可以发送上行 SRS信 号, 有利于更好的支持波束赋形、 下行非码本等传输方式。 现有技术 采用上行调度信令触发用户设备发送 SRS信号, 而上行调度信令不 能用于用户进行下行传输。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可借助软件加必需的通用硬件平台的方式来实现, 当然也可 以通过硬件,但很多情况下前者是更佳的实施方式。基于这样的理解, 软件产品的形式体现出来, 该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台终端设备(可以是手机,个人计算机, 服务器, 或者网络设备等)执行本发明各个实施例所述的方法。
以上所述仅是本发明的优选实施方式, 应当指出, 对于本技术领 域的普通技术人员来说, 在不脱离本发明原理的前提下, 还可以做出 若干改进和润饰, 这些改进和润饰也应视本发明的保护范围。

Claims

权利要求
1、 一种触发 SRS信号发送的方法, 其特征在于, 包括: 基站向用户设备发送下行传输调度信令,其中携带用于指示所述 用户设备发送 SRS信号的指示信息。
2、 如权利要求 1所述的方法, 其特征在于, 所述指示信息为 1 比特的指示标识。
3、 如权利要求 1 所述的方法, 其特征在于, 所述指示信息为 LVRB/DVRB的信息位, 且若该信息位指示 LVRB, 则表示指示用户 设备发送 SRS信号。
4、 一种基站, 其特征在于, 包括:
发送模块, 用于向用户设备发送下行传输调度信令, 其中携带用 于指示所述用户设备发送 SRS信号的指示信息。
5、 如权利要求 4所述的基站, 其特征在于, 所述发送模块具体 用于: 发送 1比特的指示标识作为指示信息。
6、 如权利要求 4所述的基站, 其特征在于, 所述发送模块具体 用于:发送 LVRB/DVRB的信息位作为指示信息,且若该信息位指示 LVRB, 则表示指示用户设备发送 SRS信号。
7、 一种触发上行探测导频 SRS信号发送的方法, 其特征在于, 包括:
基站发送专用控制信道 PDCCH信令, 其中携带与多个用户设备 对应的标识信息, 以及分别与所述多个用户设备——对应的 SRS发 送指示信息, 所述 SRS发送指示信息用于指示相应的用户设备是否 发送 SRS信号。
8、 如权利要求 7所述的方法, 其特征在于, 所述与多个用户设 备对应的标识信息为 SRS无线网络临时标识符。
9、 如权利要求 7所述的方法, 其特征在于, 所述基站在 PDCCH 信道的公共搜索空间发送所述 PDCCH信令。
10、如权利要求 7所述的方法,其特征在于,在发送所述 PDCCH 信令之前还包括: 为所述多个用户设备分别预留发送 SRS信号的资 源。
11、 如权利要求 10所述的方法, 其特征在于, 为所述多个用户 设备所分别预留的资源相互正交。
12、 如权利要求 7-11 任一项所述的方法, 其特征在于, 所述 PDCCH信令中还携带 SRS配置参数。
13、 如权利要求 12所述的方法, 其特征在于, 所述 SRS配置参 数包括: 信号序列、 频带信息。
14、如权利要求 7-11任一项所述的方法,其特征在于,所述 SRS 发送指示信息为 1比特的指示标识。
15、 一种基站, 其特征在于, 包括:
发送模块, 用于发送 PDCCH信令, 其中携带与多个用户设备对 应的标识信息, 以及与所述多个用户设备标识——对应的 SRS发送 指示信息, 所述 SRS发送指示信息用于指示相应的用户设备是否发 送 SRS信号。
16、 如权利要求 15所述的基站, 其特征在于, 所述发送模块具 体用于: 发送 SRS无线网络临时标识符作为与所述多个用户设备对 应的标识信息。
17、 如权利要求 15所述的基站, 其特征在于, 所述发送模块具 体用于: 在 PDCCH信道的公共搜索空间发送所述 PDCCH信令。
18、 如权利要求 15所述的基站, 其特征在于, 所述发送模块具 体用于: 发送 1比特的指示标识作为 SRS发送指示信息。
19、 如权利要求 15-18任一项所述的基站, 其特征在于, 所述发 送模块具体用于: 发送携带 SRS配置参数的 PDCCH信令。
20、如权利要求 15-18任一项所述的基站,其特征在于,还包括: 资源预留模块,用于在所述发送模块发送所述 PDCCH信令之前, 为所述多个用户设备分别预留发送 SRS信号的资源, 或将为所述多 个用户设备分别预留的用于发送 SRS信号的资源指示给所述多个用 户设备。
21、 如权利要求 20所述的基站, 其特征在于, 所述资源预留模 块具体用于: 为所述多个用户设备分别预留相互正交的资源, 或指示 给用户设备用于发送 SRS信号的相互正交的资源。
22、 一种根据权利要求 7-14任一项所述的方法实现的 SRS信号 发送方法, 其特征在于, 包括:
与 PDCCH信令中的所述与多个用户设备对应的标识信息所对应 的用户设备, 接收该 PDCCH信令, 所述 PDCCH信令中包含与所述 用户设备对应的 SRS发送指示信息;
如果所述 SRS发送指示信息指示用户设备发送 SRS信号, 则所 述用户设备发送 SRS信号。
23、 如权利要求 22所述的方法, 其特征在于, 所述用户设备在 接收所述 PDCCH信令的子帧之后的第 n个子帧发送 SRS信号,其中, n为默认设定。
24、如权利要求 23所述的方法,其特征在于,对于时分双工 TDD 系统, 所述 n根据 TDD系统的各种时隙配置类型分别设定。
25、 如权利要求 22所述的方法, 其特征在于, 所述用户设备根 据预先配置的 SRS发送配置信息发送 SRS信号。
26、 如权利要求 22所述的方法, 其特征在于, 所述用户设备使 用为所述用户设备发送 SRS信号所预留的资源发送 SRS信号。
27、 如权利要求 22所述的方法, 其特征在于, 所述用户设备在 公共搜索空间搜索 PDCCH。
28、 一种根据权利要求 7-12任一项所述的方法实现的用户设备, 其特征在于, 包括:
接收模块, 用于在用户设备是与 PDCCH信令中的所述与多个用 户设备对应的标识信息所对应的用户设备时, 接收该 PDCCH信令, 所述 PDCCH信令中包含与所述用户设备对应的 SRS发送指示信息; 发送模块, 用于在所述接收模块接收到的 PDCCH信令中的所述 SRS发送指示信息指示用户设备发送 SRS信号时发送 SRS信号。
29、 如权利要求 28所述的用户设备, 其特征在于, 所述发送模 块具体用于: 在接收所述 PDCCH信令的子帧之后的第 n个子帧发送 SRS信号, 其中, n为默认设定。
30、 如权利要求 28所述的用户设备, 其特征在于, 所述发送模 块具体用于: 根据预先配置的 SRS发送配置信息发送 SRS信号。
31、 如权利要求 28所述的用户设备, 其特征在于, 所述发送模 块具体用于: 使用为所述用户设备发送 SRS信号所预留的资源发送 SRS信号。
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