Method of srs assisted partial frequency sounding with srs

Abstract

A method of wireless communication is disclosed that includes receiving configuration information for channel sounding reference signal (SRS) configuration via downlink control information (DCI) or higher layer signaling and configuring one or more SRS resources for partial or full frequency sounding based on the configuration information. In other aspects, a terminal and a wireless communication system are also disclosed.

Description

Technical Field

[0001] One or more embodiments disclosed herein relate to mechanisms for enhancing the capacity and / or coverage of a channel sounding reference signal (SRS) by taking into account partial sounding aided by a channel state information reference signal (CSI-RS) on the spectrum. Background Technology

[0002] In 5G New Radio (NR) technology, new requirements are being identified to further enhance SRS transmission. New items in Rel.17 involve, for example, NR Multiple-Input Multiple-Output (MIMO).

[0003] In the ongoing new research, SRS enhancements are targeted at frequency ranges (FR) 1 and FR2. In particular, research is underway to identify and specify enhancements for aperiodic SRS triggering to facilitate more flexible triggering and / or reduce downlink control information (DCI) overhead / usage.

[0004] In addition, studies are underway to specify SRS handover for up to eight antennas (e.g., xTyR, x = {1, 2, 4} and y = {6, 8}). Furthermore, studies are evaluating, and, if necessary, specifying, mechanisms to enhance SRS capacity and / or coverage, including SRS time bundling, increased SRS repetition, and / or cross-frequency partial detection.

[0005] Reference List

[0006] Non-patent reference documents

[0007] [Non-Patent Reference 1] 3GPP RP 193133, “New WID: Further enhancements on MIMO for NR”, December 2019.

[0008] [Non-Patent Reference 2] 3GPP TS 38.211, "NR; Physical channels and modulation (Revision 16)".

[0009] [Non-Patent Reference 3] 3GPP RAN#1E-meeting#104e, R1-2009255, “Discussion on SRS enhancement”, November 2020.

[0010] [Non-Patent Reference 4] 3GPP TS 38.331, "NR; Radio Resource Control; Protocol Specification (Version 15)" Summary of the Invention

[0011] In one or more embodiments, a wireless communication method includes: receiving configuration information for configuring a channel sounding reference signal (SRS) via downlink control information (DCI) or higher-layer signaling; and configuring one or more SRS resources for partial or full-frequency sounding based on the configuration information.

[0012] In one aspect, the wireless communication method further includes associating one or more Channel State Information-Reference Signal (CSI-RS) resources with the one or more SRS resources.

[0013] In one aspect, based on configuration information, one or more CSI-RS resources and one or more SRS resources are associated.

[0014] In one aspect, the configuration information is sent via signaling through Radio Resource Control (RRC) signaling.

[0015] In one aspect, configuration information is dynamically updated by DCI.

[0016] In one respect, the configuration information is dynamically updated by the Media Access Control-Equipment (MAC-CE).

[0017] In one aspect, the wireless communication method further includes activating the one or more SRS resources for transmission, precoding the one or more SRS resources for transmission, and transmitting the one or more SRS resources.

[0018] In one aspect, the wireless communication method also includes deactivating the one or more SRS resources used for transmission.

[0019] In one or more embodiments, the terminal includes: a receiver that receives configuration information for channel sounding reference signal (SRS) configuration via downlink control information (DCI) or higher-layer signaling; and a processor that configures one or more SRS resources for partial or full frequency sounding based on the configuration information.

[0020] In one or more embodiments, the wireless communication system includes a terminal having: a receiver that receives configuration information for channel sounding reference signal (SRS) configuration via downlink control information (DCI) or higher-layer signaling; and a processor that configures one or more SRS resources for partial or full frequency sounding based on the configuration information. The wireless communication system also includes a base station having a transmitter for transmitting the configuration information.

[0021] Other embodiments and advantages of the invention will become apparent from the specification and accompanying drawings. Attached Figure Description

[0022] Figure 1This is a diagram illustrating a schematic configuration of a wireless communication system according to an embodiment.

[0023] Figure 2 This is a diagram illustrating a schematic configuration of the UE according to an embodiment.

[0024] Figure 3 This is an illustrative configuration of UE 10 according to an embodiment.

[0025] Figure 4 An example of partial frequency detection using SRS is shown.

[0026] Figure 5 An exemplary CSI-RS-assisted partial frequency detection using SRS is shown.

[0027] Figure 6 An example of the association between CSI-RS resources and SRS resources is shown.

[0028] Figure 7 An example of the association between CSI-RS resources and SRS resources is shown.

[0029] Figure 8 An example of the association between CSI-RS resources and SRS resources is shown.

[0030] Figure 9 An example of the association between CSI-RS resources and SRS resources is shown. Detailed Implementation

[0031] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. For consistency, the same elements in the figures are indicated by the same reference numerals.

[0032] In the following description of embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid obscuring the invention.

[0033] Figure 1 A wireless communication system 1 according to one or more embodiments of the present invention is described. The wireless communication system 1 includes a user equipment (UE) 10, a base station (BS) 20, and a core network 30. The wireless communication system 1 may be an NR system. The wireless communication system 1 is not limited to the specific configuration described herein and may be any type of wireless communication system, such as an LTE / LTE-Advanced (LTE-A) system.

[0034] BS 20 can transmit uplink (UL) and downlink (DL) signals with UE 10 in the BS 20 cell. DL and UL signals may include control information and user data. BS 20 can transmit DL and UL signals with core network 30 via backhaul link 31. BS 20 can be a gNodeB (gNB). BS 20 can be referred to as network (NW) 20.

[0035] BS 20 includes an antenna, a communication interface (e.g., an X2 interface) for communicating with adjacent BS 20, a communication interface (e.g., an S1 interface) for communicating with the core network 30, and a CPU (Central Processing Unit) such as a processor or circuitry to process signals transmitted and received by UE 10. Operation of BS 20 can be achieved by the processor processing or executing data and programs stored in memory. However, BS 20 is not limited to the hardware configuration described above and can be implemented by other suitable hardware configurations understood by those skilled in the art. Multiple BS 20s can be deployed to cover a wider service area of ​​wireless communication system 1.

[0036] UE 10 can use Multiple-Input Multiple-Output (MIMO) technology to transmit DL and UL signals, including control information and user data, to BS 20. UE 10 can be a mobile station, smartphone, cellular phone, tablet computer, mobile router, or information processing device with wireless communication capabilities, such as a wearable device. Wireless communication system 1 may include one or more UEs 10.

[0037] UE 10 includes a CPU such as a processor, RAM (random access memory), flash memory, and wireless communication devices for transmitting / receiving radio signals to / from BS 20 and UE 10. For example, the operation of UE 10 described below can be implemented by the CPU processing or executing data and programs stored in memory. However, UE 10 is not limited to the hardware configuration described above and can be configured with circuitry, for example, to implement the processing described below.

[0038] like Figure 1 As shown, BS 20 can send a CSI reference signal (CSI-RS) to UE 10. In response, UE 10 can send a CSI report to BS 20. Similarly, UE 10 can send an SRS to BS 20.

[0039] (BS configuration)

[0040] The following will refer to Figure 2 BS 20 is described according to an embodiment of the present invention. Figure 2This is a schematic diagram illustrating a configuration of BS 20 according to an embodiment of the present invention. BS 20 may include multiple antennas (antenna element groups) 201, amplifiers 202, transceivers (transmitters / receivers) 203, baseband signal processors 204, call processors 205, and transmit path interfaces 206.

[0041] User data transmitted from BS 20 to UE 20 on DL is input from the core network to baseband signal processor 204 via transmit path interface 206.

[0042] In the baseband signal processor 204, the signal undergoes Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer transmission processing such as user data partitioning and coupling, and RLC retransmission control transmission processing, including, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing for Medium Access Control (MAC) retransmission control. The resulting signal is then transmitted to each transceiver 203. For signals in the DL control channel, transmission processing including channel coding and Inverse Fast Fourier Transform is performed, and the resulting signal is sent to each transceiver 203.

[0043] The baseband signal processor 204 notifies each UE 10 of control information (system information) for communication within the cell via higher-layer signaling (e.g., Radio Resource Control (RRC) signaling and broadcast channels). Information for communication within the cell includes, for example, UL or DL ​​system bandwidth.

[0044] In each transceiver 203, the baseband signal pre-coded by each antenna and output from the baseband signal processor 204 undergoes frequency conversion processing to the radio frequency band. The amplifier 202 amplifies the frequency-converted high-frequency signal and transmits it from the antenna 201.

[0045] For data to be transmitted from UE 10 to BS 20 on UL, radio frequency signals are received in each antenna 201, amplified in amplifier 202, frequency-converted and converted into baseband signals in transceiver 203, and then input to baseband signal processor 204.

[0046] The baseband signal processor 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC and PDCP layer reception processing on the user data included in the received baseband signal. The obtained signal is then transmitted to the core network via the transmit path interface 206. The call processor 205 performs call processing such as establishing and releasing communication channels, manages the state of the BS 20, and manages radio resources.

[0047] (UE configuration)

[0048] The following will refer to Figure 3 A UE 10 according to an embodiment of the present invention is described. Figure 3 This is an illustrative configuration of UE 10 according to an embodiment of the present invention. UE 10 has multiple UE antennas S101, an amplifier 102, circuitry 103 including a transceiver (transmitter / receiver) 1031, a controller 104, and an application 105.

[0049] For DL, the radio frequency signal received in the UE antenna S101 is amplified in each amplifier 102 and undergoes frequency conversion to baseband signal in the transceiver 1031. In the controller 104, these baseband signals undergo receive processing, such as FFT processing, error correction decoding, and retransmission control. DL user data is transmitted to application 105. Application 105 performs processing related to higher layers above the physical and MAC layers. In downlink data, broadcast information is also transmitted to application 105.

[0050] On the other hand, UL user data is input from application 105 to controller 104. In controller 104, retransmission control (hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing, etc., are performed, and the resulting signals are transmitted to each transceiver 1031. In transceiver 1031, the baseband signal output from controller 104 is converted to a radio frequency band. Then, the frequency-converted RF signal is amplified in amplifier 102 and then transmitted from antenna 101.

[0051] As mentioned above, research on SRS enhancement is underway. In one or more embodiments described herein, mechanisms for enhancing SRS capacity and / or coverage can be provided by including SRS time binding, increased SRS repetition, and / or cross-frequency partial probing.

[0052] Reference Figure 4 In one or more embodiments of the examples shown, partial frequency sensing utilizing SRS can be performed. One or more potential advantages of partial frequency sensing include the following possibilities.

[0053] Compared to full-band sensing, partial-band sensing (or partial-frequency sensing) provides a way to increase the power per subcarrier because the available transmit power is allocated to a smaller bandwidth partition.

[0054] Furthermore, it enhances SRS capacity by providing the network with the opportunity to reuse more UE ports on remaining frequency resources.

[0055] One or more potential drawbacks are that frequency-selective scheduling across the entire DL transmit bandwidth is not feasible because the entire frequency band is not probed from the SRS transmission within a time slot. Furthermore, due to partial frequency probes, NW may be unable to extract the interference structure of the channel.

[0056] Now for reference Figure 5 The examples shown describe one or more embodiments. As mentioned above, due to partial frequency detection, NW may be unable to extract the interference structure of the channel. As a solution, in [3], it has been proposed to associate SRS resources with CSI-RS resources so that the UE can use CSI-RS to measure DL interference covariance and precode SRS transmission accordingly.

[0057] For example, such as Figure 5 As shown, based on the DL interference measurement considering the associated CSI-RS resource CSI-RS#1, the UE precodes the SRS resource SRS#1 before it is sent, so that the NW can know the interference status at the UE.

[0058] Note that precoded SRS transmissions can also be applied to full-frequency SRS detection.

[0059] One or more embodiments involve switching between full-frequency probe and partial-frequency probe using SRS. Specifically, using higher-layer signaling or DCI, the UE is configured to consider whether to consider partial / full-bandwidth SRS transmission. For example, using DCI or higher-layer signaling, the UE is instructed whether to consider utilizing partial or full-bandwidth SRS probe, i.e., x = 0 -> full band; x = 1 -> half of the available band.

[0060] Regarding dynamic handover, DCI can be used for dynamic handover between full-frequency detection and partial-frequency detection in SRS. In particular, one or more of the following options can be considered for dynamic handover using DCI.

[0061] As a first option, 1 bit is added to the DCI to enable switching between partial and full frequency detection using SRS. As a second option, the SRS request field in the DCI indicates SRS resources. The indicated SRS resources include the necessary configuration for partial / full frequency detection. In the case of dynamic switching between partial and full frequency detection using SRS transmission, the following can be considered: During dynamic switching, if partial frequency detection is indicated, the SRS is precoded using interference information derived from the associated CSI-RS. Otherwise, the interference information derived from the associated CSI-RS is considered, and the SRS is not precoded for partial frequency detection.

[0062] If full-frequency detection is indicated, the SRS is precoded using interference information derived from the associated CSI-RS for full-frequency detection. Otherwise, the SRS is not precoded for full-frequency detection.

[0063] according to Figure 6 One or more embodiments involve the association of CSI-RS resources with SRS resources. Specifically, using higher-layer signaling or DCI, the UE is configured with the association between CSI-RS resources and SRS resources.

[0064] As a first option according to one or more embodiments, it is considered to use RRC signaling to associate SRS resources set to "antenna switching" with CSI-RS resources used for DL ​​interference measurement purposes. Specifically, Figure 6 The example shown illustrates a new RRC IE that can be used for this association.

[0065] Note that if the precoded SRS is only applicable to partial frequency detection, then when full frequency detection is configured, the UE can export DL interference information without considering the associated CSI-RS resources.

[0066] As a second option according to one or more embodiments, the association between CSI-RS resources and specific SRS resources can be dynamically updated / configured using DCI or MAC-CE. For example, when requesting UL SRS transmission using DCI, the UE is configured with the necessary CSI-RS association information. As another example, multiple CSI-RS resources can be associated with SRS resources. Then, using DCI or MAC-CE, the UE is updated / configured using the specific CSI-RS resources to be considered among those CSI-RS resources.

[0067] according to Figure 7 Examples of one or more embodiments shown illustrate how a single CSI-RS resource can be associated with multiple SRS resources using higher-layer signaling or DCI. For example, as Figure 7 As shown, the CSI-RS#1 resource is associated with the resources used by SRS#1 and SRS#2 and is set to 'antenna switching'.

[0068] according to Figure 8 Another example of one or more embodiments shown considers that multiple CSI-RS resources can be associated with a single SRS resource using higher-level signaling or DCI. For example, as Figure 8 As shown, CSI-RS#1 and CSI-RS#2 resources are associated with the SRS#1 resource of the usage set for 'antenna switching'.

[0069] according to Figure 9One or more embodiments of another example shown consider how a single CSI-RS resource can be associated with different SRS resources using higher-layer signaling or DCI. For example, as Figure 9 As shown, the CSI-RS#1 resource is associated with the SRS#1 resource 'Antenna Switching' and the SRS#2 resource 'Non-Codebook'.

[0070] One or more embodiments involve activating precoded SRS for partial / full frequency detection. That is, using higher-layer signaling or DCI, the UE is instructed / activated whether to precoded SRS transmission for partial / full frequency detection.

[0071] Regarding dynamic handover, DCI can be used to dynamically switch between precoding and not precoding SRS transmissions. Specifically, one or more of the following options can be considered for dynamic handover using DCI.

[0072] In a first option according to one or more embodiments, 1 bit is added to the DCI to activate / deactivate the SRS precoding.

[0073] In a second option according to one or more embodiments, the SRS request field in the DCI indicates an SRS resource. The indicated SRS resource includes the necessary configuration for SRS precoding / non-precoding. For example, if the indicated SRS resource is associated with a CSI-RS resource, the UE considers interference information derived from the associated CSI-RS resource to precode the SRS transmission; otherwise, the SRS is not precoded.

[0074] Note that for SRS precoder determination, interference measurements from associated CSI-RS resources can be configured.

[0075] It should also be noted that the precoder generation for SRS can also be based on other mechanisms / standards, without relying on CSI-RS-based interference measurements. For example, referring to a first option according to one or more embodiments, it can be assumed that no CSI-RS resource is associated with an SRS resource. As another example of a second option according to one or more embodiments, it is possible to configure the association between CSI-RS resources and SRS resources. Subsequently, higher-layer signaling or DCI is used to instruct the UE whether to consider the associated CSI-RS resources determined for the SRS precoder.

[0076] Variation Example

[0077] The information, signals, and / or other information described in this specification may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., all of which may be referenced in the description contained herein, may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or photons, or any combination thereof.

[0078] Furthermore, information and signals can be output from higher layers to lower layers and / or from lower layers to higher layers. Information and signals can be input and / or output via multiple network nodes.

[0079] Input and / or output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using a management table. Information, signals, etc., to be input and / or output can be overwritten, updated, or appended. Output information, signals, etc., can be deleted. Input information, signals, etc., can be sent to another device.

[0080] The reporting of information is by no means limited to the aspects / current embodiments described in this specification, and other methods may also be used. For example, the reporting of information may be achieved by using physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB) etc.), MAC (Media Access Control) signaling, etc.) and other signals and / or combinations thereof.

[0081] Software, whether referred to as “software,” “firmware,” “middleware,” “microcode,” “hardware description language,” or by other terms, should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc.

[0082] Furthermore, software, commands, and information can be sent and received via communication media. For example, when software is sent from a website, server, or other remote source using wired technologies (coaxial cable, fiber optic cable, twisted pair cable, digital subscriber line (DSL), etc.) and / or wireless technologies (infrared radiation, microwaves, etc.), these wired and / or wireless technologies are also included in the definition of communication media.

[0083] The terms “system” and “network” used in this specification are used interchangeably.

[0084] In this specification, the terms "base station (BS)," "radio base station," "eNB," "gNB," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. A base station may be referred to as a "fixed station," "node B," "eNodeB (eNB)," "access point," "transmitting point," "receiving point," "nanopico cell," "small cell," etc.

[0085] A base station can accommodate one or more (e.g., three) cells (also called "sectors"). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can provide communication services through a base station subsystem (e.g., an indoor small cell (RRH (Remote Radio Head))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​the base station and / or the base station subsystem that provides communication services within that coverage area.

[0086] In this specification, the terms “mobile station (MS)”, “user terminal”, “user equipment (UE)” and “terminal” are used interchangeably.

[0087] Those skilled in the art may refer to a mobile station as a “user station,” “mobile unit,” “subscriber unit,” “wireless unit,” “remote unit,” “mobile device,” “wireless communication device,” “remote device,” “mobile user station,” “access terminal,” “mobile terminal,” “wireless terminal,” “remote terminal,” “mobile phone,” “user agent,” “mobile client,” “client,” or some other appropriate term in certain circumstances.

[0088] Furthermore, the radio base station mentioned in this specification can be interpreted as a user terminal. For example, each aspect / embodiment of this disclosure can be applied to a configuration where communication between a radio base station and a user terminal is replaced with communication between multiple user terminals (D2D (device-to-device)). In this case, user terminal 20 can have the functions of the radio base station 10 described above. Additionally, terms such as "uplink" and "downlink" can be interpreted as "side". For example, an uplink channel can be interpreted as a side channel.

[0089] Similarly, the user terminal in this specification can be interpreted as a radio base station. In this case, the radio base station can have the functions of the aforementioned user terminal.

[0090] Actions performed by a base station as described in this specification may, in some cases, be performed by a higher-level node. In a network comprising one or more network nodes having base stations, it is apparent that various operations performed to communicate with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g., MME (Mobility Management Entity), S-GW (Serving Gateway), etc., but these are not limiting), or a combination thereof.

[0091] The one or more embodiments illustrated in this specification can be used individually or in combination, and can be switched depending on the implementation. The order of processes, sequences, flowcharts, etc., used to describe the aspects / embodiments herein can be reordered as long as no inconsistency occurs. For example, although various methods with various step components have been illustrated in an exemplary order in this specification, the specific order shown herein is by no means limiting.

[0092] One or more embodiments illustrated in this disclosure can be applied to LTE (Long Term Evolution), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th Generation Mobile Communications System (4G), 5th Generation Mobile Communications System (5G), (Future Radio Access (FRA), New-RAT, New Radio (NR), NX (New Radio Access), Future Radio Access (FX), registered trademark (GSM) (Global System for Mobile Communications), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (registered trademark)), 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), systems using other suitable radio communication methods, and / or next-generation systems based on these enhancements.

[0093] Unless otherwise stated, the phrase “based on” (or “on the basis of”) used in this specification does not mean “based on only” (or “on the basis of”). In other words, the phrase “based on” (or “on the basis of”) means “based on only” and “at least based on” (“on the basis of only” and “at least on the basis of”).

[0094] References to elements having names such as "first," "second," etc., as used herein, generally do not restrict the number or order of these elements. These names are used herein merely for convenience as a way to distinguish two or more elements. Therefore, references to the first element and the second element do not imply that only two elements can be used, or that the first element must somehow precede the second element.

[0095] As used herein, the term "judgment (determination)" can encompass a wide variety of actions. For example, "judgment (determination)" can be interpreted as making a judgment (determination) regarding calculation, processing, derivation, investigation, searching (e.g., searching a table, database, or some other data structure), ascertainment, etc. Furthermore, "judgment (determination)" can be interpreted as making a judgment (determination) regarding receiving (e.g., receiving information), sending (e.g., sending information), inputting, outputting, accessing (e.g., accessing data in memory), etc. Additionally, "judgment (determination)" as used herein can be interpreted as making a judgment (determination) regarding parsing, selecting, choosing, assuming, establishing, comparing, etc. In other words, "judgment (determination)" can be interpreted as making a judgment (determination) regarding certain actions.

[0096] As used herein, the terms “connection” and “coupling,” or any variations thereof, refer to all direct or indirect connections or couplings between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Coupling or connection between elements can be physical, logical, or a combination thereof. For example, “connection” can be interpreted as “access.”

[0097] In this specification, when two components are connected, the two components may be considered as “connected” or “coupled” to each other by means of one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples, by means of electromagnetic energy having wavelengths in the radio frequency region, microwave region (both visible and invisible), optical region, etc.

[0098] In this specification, the phrase "A and B are different" can mean "A and B are different from each other." The terms "separation," "coupling," etc., can be interpreted similarly.

[0099] Furthermore, the term "or" used in this specification or claims is not an exclusive separation.

[0100] The present invention has been described in detail above, but it is not limited to the embodiments set forth in this specification, as will be apparent to those skilled in the art. Various modifications and alterations can be made to implement the invention without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this specification is provided for illustrative purposes only and should not in any way be construed as limiting the invention according to the present invention.

[0101] The examples and modified examples described above can be combined with each other, and the various features of these examples can be combined with each other in various combinations. The invention is not limited to the specific combinations disclosed herein.

[0102] Although this disclosure has been described with respect to only a limited number of embodiments, those skilled in the art who benefit from this disclosure will understand that various other embodiments can be devised without departing from the scope of the invention. Therefore, the scope of the invention should be defined only by the appended claims.

Claims

1. A terminal, comprising: The receiving unit receives configuration information for configuring the Sound Reference Signal (SRS) via higher-layer signaling; and The control unit, based on the configuration information, determines one or more SRS resources for partial or full frequency detection. The control unit precodes the SRS during SRS transmission using the SRS resources for frequency detection, based on the SRS request field of the downlink control information (DCI). The control unit, based on the SRS request field of the DCI, does not precode the SRS during SRS transmission using the SRS resources for full-frequency detection. The control unit switches between full-frequency detection and partial-frequency detection based on the SRS request field of the DCI.

2. The terminal according to claim 1, wherein, The SRS resources used for frequency detection are associated with the Channel State Information Reference Signal (CSI-RS) resources.

3. A wireless communication method, comprising: The steps for receiving configuration information for configuring the Sound Reference Signal (SRS) via higher-layer signaling; The steps for determining one or more SRS resources for partial or full frequency detection based on the configuration information; Based on the SRS request field of the downlink control information (DCI), the SRS is precoded during SRS transmission using the SRS resources for frequency detection. Based on the SRS request field of the DCI, the step of not precoding the SRS during SRS transmission using the SRS resources for full-frequency detection; and The step of switching between full-frequency detection and partial-frequency detection based on the SRS request field of the DCI.

4. A base station, comprising: The transmitting unit sends to the terminal via higher-layer signaling: configuration information for configuring one or more detection reference signal (SRS) resources for partial or full frequency detection, and downlink control information (DCI) including an SRS request field used in the handover of the full frequency detection and the partial frequency detection based on the terminal. as well as The control unit controls the reception of SRS with the SRS request field pre-coded based on the DCI when performing SRS transmission using the SRS resources for partial frequency detection based on the terminal, and controls the reception of SRS without pre-coding based on the SRS request field of the DCI when performing SRS transmission using the SRS resources for full frequency detection based on the terminal.

5. A system comprising a terminal and a base station, The terminal has: The receiving unit receives configuration information for configuring the Sound Reference Signal (SRS) via higher-layer signaling; as well as The control unit, based on the configuration information, determines one or more SRS resources for partial or full frequency detection. The control unit precodes the SRS during SRS transmission using the SRS resources for frequency detection, based on the SRS request field of the downlink control information (DCI). The control unit, based on the SRS request field of the DCI, does not precode the SRS during SRS transmission using the SRS resources for full-frequency detection. The control unit switches between full-frequency detection and partial-frequency detection based on the SRS request field of the DCI. The base station has: The sending unit sends the configuration information and the DCI; as well as The control unit controls the reception of the SRS.

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