JP2022119804A - Method and UE - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for transmitting a reference signal (RS).

SOLUTION: A method is to be implemented in a network device. A first set of RS resources is determined for RS transmission by the network device. The first set of RS resources corresponds to a first set of resource elements (REs) which are associated with a first number of RS ports to be used for RS transmission and are interpolated with unused REs in a frequency domain. The method further generates a first RS configuration for RS transmission based on the first set of RS resources, and transmits information about the first RS configuration to terminal devices to be served by the network device.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

TECHNICAL FIELD Embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly to methods and apparatus for reference signal (RS) transmission.

With the development of communication technology, multiple types of services or traffic have been proposed, such as enhanced mobile broadband (eMBB), which generally requires high data rates, usually requiring long battery life. and ultra-reliable and low latency communication (URLLC). Meanwhile, multi-antenna schemes such as beam management and reference signal transmission are being researched for new radio access. In particular, the 3GPP specification states that the Channel State Information-Reference Signal (CSI-RS) can support beam sweeping within an Orthogonal Frequency Division Multiplexing (OFDM) symbol. Agreed.

CSI-RS should support transmit (Tx) and receive (Rx) beam sweeping, which can help terminal devices find good Tx-Rx beam pairs. To obtain an optimal Tx-Rx beam pair, if there are N _t Tx beams and N _r Rx beams, the CSI-RS needs to provide a total of N _t ×N _r repetitions. If each repetition takes 1 symbol, a total of N _t ×N _r symbols may be needed for CSI-RS transmission. There may be a large number of antennas for a particular Tx/Rx point (such as a NodeB for new radio access) and terminal devices, which means a large number of beams to be swept. In this case, CSI-RS transmission overhead and delay reduction schemes need to be considered.

In general, exemplary embodiments of the present disclosure provide methods and apparatus for RS transmission.

In a first aspect, a method implemented in a network device is provided. According to this method, a first set of RS resources is determined by a network device for RS transmission. A first set of RS resources is associated with a first number of RS ports used for RS transmission and interpolated by unused REs in the frequency domain. , correspond to a first set of resource elements (RE). A first RS configuration for RS transmission is generated based on the above first set of RS resources. Information about the above first RS configuration (setting) is sent to the terminal device served by the network device.

In a second aspect, a method implemented in a terminal device is provided. According to the method, information regarding a first RS configuration for RS transmissions by the network device is received from the network device. A first RS configuration is determined based on a first set of RS resources for RS transmission. The first set of RS resources corresponds to a first set of REs associated with a first number of RS ports used for RS transmission and interpolated by at least one unused RE in the frequency domain. At least one RS sequence is detected based on the first RS configuration.

In a third aspect, a network device is provided. The network device has a processor and memory coupled to the processor. The memory stores instructions that, when executed by the processor, cause the network device to perform actions. The action includes determining a first set of RS resources for RS transmission by the network device. The first set of RS resources is associated with the first number of RS port groups used for RS transmission and corresponds to the first set of REs interpolated with unused REs in the frequency domain. The action further includes generating a first RS configuration for RS transmission based on the first set of RS resources, and transmitting information about the first RS configuration to terminal devices served by the network device. ,including.

In a fourth aspect, a terminal device is provided. The terminal device has a processor and memory coupled to the processor. The memory stores instructions that, when executed by the processor, cause the network device to perform actions. The action includes receiving information from the network device regarding a first reference signal (RS) configuration for RS transmission by the network device. A first RS configuration is determined based on a first set of RS resources for RS transmission. The first set of RS resources is associated with a first number of RS ports used for RS transmission and corresponds to a first set of resource elements (REs) interpolated by at least one unused RE in the frequency domain. do. The action further includes detecting at least one RS sequence based on the first RS configuration.

Other features of the present disclosure will become readily comprehensible through the following description.

The above and other objects, features, and advantages of the present disclosure will become more apparent through a more detailed description of several embodiments of the present disclosure in the accompanying drawings.

1 is a block diagram of a communication environment in which embodiments of the present disclosure may be implemented; FIG.

FIG. 2 is a flowchart illustrating a process for RS transmission, according to some embodiments of the present disclosure.

FIG. 3 is a flowchart of an exemplary method according to some embodiments of the disclosure.

FIG. 4A is a diagram illustrating an example of selecting a first set of RS resources from a predetermined set of RS resources, according to some embodiments of the present disclosure. FIG. 4B is a diagram illustrating an example of selecting a first set of RS resources from a predetermined set of RS resources, according to some embodiments of the disclosure.

FIG. 5 is a diagram illustrating an example of selecting a first set of RS resources from a predetermined set of RS resources according to another embodiment of the disclosure.

FIG. 6 is a flowchart of an exemplary method according to some embodiments of the disclosure.

7A-7D are diagrams illustrating examples of configuring a second set of RS resources, according to some embodiments of the present disclosure.

FIG. 8A is a diagram illustrating an example of RPF indication in RS configuration, according to some embodiments of the present disclosure.

FIG. 8B is a diagram illustrating example information regarding a second RS configuration, according to some embodiments of the present disclosure.

FIG. 9 is a flowchart of an exemplary method according to some embodiments of the disclosure.

10A-10B are diagrams illustrating example resource mappings for different RS sequences, according to some embodiments of the present disclosure.

11A-11B are diagrams illustrating example resource mappings for different RS sequences, according to some embodiments of the present disclosure.

12A-12B are diagrams illustrating examples of different power configurations for RS transmissions, according to some embodiments of the present disclosure.

FIG. 13 is a diagram illustrating example SRS configurations associated with CSI-RS configurations, according to some embodiments of the present disclosure.

Figure 14 is a block diagram of a network device according to some embodiments of the present disclosure;

FIG. 15 is a block diagram of a terminal device according to some embodiments of the present disclosure;

Figure 16 is a simplified block diagram of a device suitable for implementing embodiments of the present disclosure;

Throughout the drawings, same or similar reference numbers represent same or similar elements.

The subject matter of this disclosure will now be described with reference to several exemplary embodiments. It should be understood that these embodiments do not imply any limitation on the scope of the present disclosure, but are described solely for the purpose of enabling those skilled in the art to better understand and practice the present disclosure. . The disclosure described herein can be implemented in various ways other than those described below.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. have

As used herein, the term "network device" or "base station" (BS) refers to a device capable of providing or hosting a cell or coverage with which terminal devices can communicate. Examples of network devices include, but are not limited to, Node B (NodeB or NB), Evolved NodeB (eNodeB or eNB), Next Generation NodeB (gNB), Remote Radio Unit (RRU), radio head ( RH), remote radio heads (RRH), and low power nodes such as femto nodes, pico nodes. For discussion purposes, some embodiments are described below with reference to a gNB as an example of a network device.

As used herein, the term "terminal device" refers to any device with wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, user equipment (UE), personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs), portable computers, digital cameras, etc. Including capture devices, gaming devices, music storage and playback appliances, or internet appliances that enable wireless or wired internet access and browsing, etc. For discussion purposes, some embodiments are described below with reference to a UE as an example of a terminal device.

As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "including" and variations thereof should be read as an open term meaning "including but not limited to". The term "based on" is read as "based at least in part on". The terms "one embodiment" and "embodiment" are read as "at least one embodiment". The term "another embodiment" is read as "at least one other embodiment". The terms "first", "second" and the like may refer to different objects or the same object. Other definitions, both explicit and implicit, may be included below.

In some examples, values, procedures, or devices are referred to as "best," "worst," "best," "minimum," "maximum," and the like. Such descriptions are intended to indicate that a choice can be made among many used functional alternatives, and that such choice is better, smaller, more expensive, or otherwise better than other choices. It will be appreciated that this is preferred, but not required.

Communications discussed in this disclosure include, but are not limited to, New Radio Access (NR), Long Term Evolution (LTE), LTE Evolution, LTE Advanced (LTE-A), Wideband Code Division Multiple Access ( WCDMA), Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), and the like. Further, the communication may be performed according to any generation of communication protocols now known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G) , 4.5G and fifth generation (5G) communication protocols.

FIG. 1 shows an exemplary communication network 100 in which embodiments of the present disclosure may be implemented. Network 100 includes network device 110 and three terminal devices 120-1, 120-2, and 120-3 (collectively referred to as terminal devices 120 or individually referred to as terminal devices 120) serviced by network device 110. ) and The coverage of network device 110 is also referred to as cell 102 . It should be understood that the numbers of base stations and terminal devices are for illustration purposes only and do not imply limitations. Network 100 may include any suitable number of base stations and terminal devices adapted to implement embodiments of the present disclosure. Although not shown, it is understood that there may be one or more neighboring cells adjacent to cell 102, with one or more corresponding network devices serving a number of terminal devices located therein. Will.

Network device 110 may communicate with terminal device 120 . Communications in network 100 include, but are not limited to, Long Term Evolution (LTE), LTE Evolution, LTE Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA). , and Global System for Mobile Communications (GSM), etc. Moreover, this communication may be performed according to any now known or future developed generation of communication protocols. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G) , 4.5G and fifth generation (5G) communication protocols.

In addition to normal data communication, network device 110 may transmit RSs to one or more terminal devices 120 in a broadcast, multicast, and/or unicast manner on the downlink. Similarly, one or more terminal devices 120 may transmit RSs to network device 110 on the uplink. As used herein, a "downlink" refers to a link from a network device to a terminal device and an "uplink" refers to a link from a terminal device to a network device. For purposes of discussion without implying any limitation, the following description describes several embodiments with respect to downlink RS transmission.

For downlink RS transmissions, for example, the RS may be used by terminal device 120 for beam sweeping, channel estimation, demodulation, and other operations for communication. Generally, an RS is a signal sequence (also called an “RS sequence”) known by both network device 110 and terminal device 120 . For example, the RS sequences may be generated and transmitted by network device 110 based on certain rules, and terminal device 120 may estimate the RS sequences based on the same rules. Examples of RS are Downlink or Uplink Demodulation Reference Signal (DMRS), Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS). , Phase Tracking Reference Signal (PTRS), etc., but not limited to these. For discussion without implying any limitation, the following description describes some embodiments with reference to CSI-RS as an example of an RS.

In downlink and uplink RS transmissions, network device 110 allocates corresponding resources (also referred to as “RS resources”) for the transmission and/or determines which RS sequences are to be transmitted. May be specified. In some scenarios, both network device 110 and terminal device 120 are equipped with multiple antenna ports (or multiple antenna elements) and transmit designated RS sequences using the antenna ports (antenna elements). can. A set of RS resources associated with the RS ports is also specified. An RS port is a specific mapping of part or all of an RS sequence to one or more resource elements of a resource region allocated for RS transmission in the time domain, frequency domain, and/or code domain, may be called.

As mentioned above, CSI-RS should support Tx and Rx beam sweeping within an OFDM symbol to allow terminal devices to find the optimal Tx-Rx beam pair. To obtain an optimal Tx-Rx beam pair, if there are N _t Tx beams and N _r Rx beams, the CSI-RS needs to provide a total of N _t ×N _r repetitions. If each repetition takes 1 symbol, a total of N _t ×N _r symbols may be needed for CSI-RS transmission. As the number of antennas in network devices and terminal devices increases, the number of beams to be swept increases. This can result in significant overhead and delay for CSI-RS transmission.

To solve one or more of the above problems and other potential problems, a solution for RS transmission is provided according to an exemplary embodiment of the present disclosure. This solution may provide a nested structure of RS resources based on Interleaved Frequency Division Multiple Access (IFDMA) technology. This nested structure of RS resources can support multiple repeated signals within one symbol in the time domain, so that terminal devices can detect multiple beams within one symbol. Furthermore, using this solution, multiple RS sequences may be mapped to different or same multiple RS resources so that the terminal device can detect multiple RS sequences simultaneously. Therefore, the solution according to embodiments of the present disclosure can significantly reduce RS transmission overhead and latency.

The principles and implementations of the present disclosure are described in detail below with reference to FIGS. 2-14. FIG. 2 now shows a general process 200 for RS transmission according to some embodiments of the present disclosure. For discussion purposes, process 200 is described with reference to FIG. Process 200 may include network device 110 and one or more terminal devices 120 served by network device 110 .

Network device 110 may configure (set) some information for the RS transmission (210). The information configured by the network device 110 includes configuration of at least one of the number of RS ports, RS resources, transmission pattern, density, at least one RS sequence, repetition factor, transmission power, etc. may contain The network device may indicate that information to terminal device 120 by sending an RS configuration (220). Terminal device 120 may receive the information configured for RS transmission from network device 110 (230). Network device 110 may send an RS to terminal device 120 based on its RS configuration (240). Terminal device 120 may receive the transmitted RS based on the RS configuration (250).

FIG. 3 shows a flowchart of an exemplary method 300 according to some embodiments of the disclosure. For discussion purposes, method 300 is described with reference to FIG. Method 300 may include network device 110 and one or more terminal devices 120 served by network device 110 .

At operation 310 , network device 110 determines a first set of RS resources for RS transmission by network device 110 . The first set of RS resources may be associated with a first number of RS ports used for RS transmission and correspond to a first set of multiple REs in the frequency domain. In some embodiments, the first set of RS resources may be selected from a predetermined set of multiple RS resources associated with a predetermined number of RS ports. In one embodiment, the first set of RS resources may be configured with a first number of RS port groups and a repetition factor.

In one embodiment, the first number above may be less than or equal to a predetermined number of RS ports. The predetermined number (represented by N) may be the same as the maximum number of RS ports supported. For example, if the maximum number of RS ports is denoted by M, the first number above may be set to be an integer less than or equal to M, such as 1, 2, . In other embodiments, the predetermined number N may be less than the maximum number of RS ports supported, eg, N<M. Then, the first number of RS ports associated with the first set of RS resources may be set to be an integer not greater than N (1, 2, . . . , N, etc.).

In one embodiment, the maximum number of RS ports may be set to eight. The first number may be set to be one of 1, 2, 4, and 8. In other embodiments, the above predetermined number may be less than the maximum number of RS ports supported, eg four. The first number of RS port groups associated with the first set of RS resources may then be set to one, two, or four.

In one embodiment, the repetition factor may be set based on the capabilities of terminal device 120 (eg, whether multiple beams can be detected within one symbol by terminal device 120). A repetition factor (RPF) may indicate the density of RS resources in the frequency domain. For example, if the RPF is equal to K (K>1), it may indicate that K−1 unused REs are interpolated between two adjacent REs for RS transmission. As known to those skilled in the art, K−1 unused REs, interpolated between every two adjacent REs, can result in K repeated signals within one symbol in the time domain. .

In one embodiment, network device 110 may select the first set of RS resources from a predetermined set of RS resources associated with the predetermined number of RS ports based on the first number of RS ports and the repetition factor. That is, a subset of the predetermined set of RS resources may be configured to be the first set of RS resources.

In one embodiment, for example, FIG. 4A shows some examples of selection of a first set of RS resources from a predetermined set of RS resources. FIG. 4A shows different sets of RS resources associated with different RS ports when RPF is equal to K. FIG. In FIG. 4A, each element represents an RE in the frequency domain. Occupied elements (i.e., shaded elements) represent REs for RS transmission, while unoccupied elements (i.e., blank or cross-filled elements) represent unused REs. represents

As shown in FIG. 4A, for example, a given set of RS resources is configured with an RPF value of K (also referred to as “RPF-K”, where K is an integer and K>1). (K−1) unused REs are placed between two adjacent REs for RS transmission. In one embodiment, if the first number of RS ports is Q, a resource set for Q RS ports (also called "Q port RS resources" for short) is selected as the first set of RS resources. good too. In another embodiment, if Q-port RS resources are determined, P-port RS resources (where P is an integer and 1≦P<Q) may be selected from the Q-port RS resources. For example, Q is a multiple of P. In another embodiment, the P-port RS resources may be a subset of the Q-port RS resources and the unselected resources may be unused for the P RS ports.

In another embodiment, for example, FIG. 4B shows some examples of selection of a first set of RS resources from a predetermined set of RS resources. FIG. 4B shows different sets of RS resources associated with different RS ports when RPF equals two. In FIG. 4B, each element may represent an RE in the frequency domain. Occupied elements (i.e. filled with shading or indexed with capital letters) represent REs for RS transmission, unoccupied elements (i.e. filled with blanks or crosses). elements) may represent unused REs. Specifically, each capital letter AH may represent the index of the RS port associated with the RE for RS transmission.

As shown in FIG. 4B, for example, a predetermined set of RS resources may be represented by resource set 410 having an RPF value of two. As indicated by resource set 410, one unused RE is located between each two adjacent REs for RS transmission. If the first number of RS ports is set to be eight, 8-port RS resources 411 may be selected as the first set of RS resources. Similarly, if 8-port RS resources are determined, 4-port RS resources may be selected from the 8-port RS resources, such as a subset of the 8-port RS resources. Examples of 4-port RS resources are shown as 412 - 414 , which are multiple subsets of 8-port RS resources 411 . 2-port RS resources, such as subsets of 8-port RS resources and/or 4-port RS resources, from 8-port RS resources and/or 4-port RS resources if 8-port RS resources and/or 4-port RS resources are determined may be selected. Examples of 2-port RS resources are shown as 415-419, each of which is a subset of either the 8-port RS resource 411 or the 4-port RS resources 412-414. If 8-port RS resources, 4-port RS resources, and/or 2-port RS resources are determined, 1-port RS resources are selected from any of the 8-port RS resources, 4-port RS resources, and/or 2-port RS resources. , may be selected. For example, 1-port RS resources can be any subset of 8-port RS resources, 4-port RS resources and/or 2-port RS resources. Examples of 1-port RS resources are shown as 420-427, each a subset of any of the 8-port RS resources 411, 4-port RS resources 412-414, and 2-port RS resources 415-419. In this way, a nested structure of RS resources based on IFDMA technology can be provided.

Similarly, FIG. 5 illustrates some examples of selecting a first set of RS resources from a predetermined set of RS resources according to another embodiment of the present disclosure. FIG. 5 shows different sets of RS resources associated with different RS ports when the repetition factor is equal to four. In FIG. 5, each element represents an RE in the frequency domain. Occupied elements (i.e. filled with shading or indexed with capital letters) represent REs for RS transmission, unoccupied elements (i.e. filled with blanks or crosses). elements) may represent unused REs. Specifically, each capital letter AH may represent the index of the RS port associated with the RE for RS transmission.

As shown in FIG. 5, for example, a predetermined set of RS resources may be represented by resource set 510 having an RPF value of four. As indicated by resource set 510, three unused REs are located between each two adjacent REs for RS transmission. If the first number of RS ports is configured to be eight, 8-port RS resources 511 may be selected as the first set of RS resources. Similarly, if 8-port RS resources are determined, then 4-port RS resources may be selected from the 8-port RS resources, such as a subset of the 8-port RS resources. Examples of 4-port RS resources are shown as 512-513, which are subsets of the 8-port RS resources 511. 2-port RS resources, such as subsets of 8-port RS resources and/or 4-port RS resources, from 8-port RS resources and/or 4-port RS resources if 8-port RS resources and/or 4-port RS resources are determined may be selected. Examples of 2-port RS resources are shown as 514-517, each of which is a subset of either the 8-port RS resource 511 or the 4-port RS resources 512-513. If 8-port RS resources, 4-port RS resources and/or 2-port RS resources are determined, 1-port RS resources are either 8-port RS resources, 4-port RS resources and/or 2-port RS resources may be selected from For example, 1-port RS resources can be any subset of 8-port RS resources, 4-port RS resources, and/or 2-port RS resources. Examples of 1-port RS resources are shown as 518-525, each a subset of any of the 8-port RS resources 511, 4-port RS resources 512-513, and 2-port RS resources 514-517.

In one embodiment, RS ports with different indices may be associated with beams. For example, one beam associated with one RS port with index A may be different than another beam associated with another RS port with index B. In another embodiment, the multiple RS ports may not be multiplexed with an orthogonal cover code (OCC).

Referring again to FIG. 3, method 300 moves to operation 320, where terminal device 110 configures an RS configuration for RS transmission (also referred to as "first RS configuration" in the description below) based on the first set of RS resources. generated). As used herein, RS configuration is for specifying one or more aspects of RS transmission, such as a set of RS resources used for transmission and/or at least one RS sequence to be transmitted. used for In some embodiments, the first RS configuration above may specify the first set of RS resources used for RS transmission.

At operation 330 , network device 110 transmits information regarding the first RS configuration to terminal device 120 . The information may indicate to terminal device 120 one or more aspects of the RS transmission specified in the first RS configuration. For example, based on a first RS configuration, the information may indicate to terminal device 120 that a first set of RS resources are to be used in RS transmissions.

At operation 340 , terminal device 120 receives information regarding the first RS configuration from network device 110 . Terminal device 120 may determine how RS transmissions are performed from the first RS configuration. For example, terminal device 120 may be configured with a first set of RS resources used for RS transmissions. Terminal device 120 may be configured with a first set of RS resources, which corresponds to a first set of REs interpolated with unused REs in the frequency domain.

In one embodiment, in addition to the set of multiple RS resources used for RS transmission (eg, the first set of RS resources), network device 110 also provides terminal device 120 with at least one RS resource set. You can set a sequence. Network device 110 may send at least one RS sequence based on its configuration to terminal device 120 . For example, network device 110 may transmit at least one sequence using the configured set of RS resources. Then, on the receiving side, terminal device 120 may detect at least one sequence based on its RS configuration.

In some embodiments, multiple RS configurations may be configured for different purposes. Multiple RS configurations may be configured based on different RS resources and/or different RS sequences. For example, different RS resources may be used for different RS transmissions from different TRPs, different beams and/or different antenna panels.

To configure different RS resources for RS transmission, FIG. 6 shows an exemplary method 600 for RS transmission according to some embodiments of this disclosure. For discussion purposes, method 600 is described with reference to FIG. Method 600 may include network device 110 and one or more terminal devices 120 served by network device 110 . Also, additional operations (not shown) may be provided and/or illustrated operations may be omitted. The scope of the disclosure described herein is not limited to this aspect.

At operation 610, network device 110 determines a second set of RS resources for RS transmission from a predetermined set of RS resources and based at least in part on the first RS configuration. A second set of RS resources may correspond to a second set of multiple REs in the frequency domain.

In some embodiments, network device 110 configures the second set of RS resources such that the second set of RS resources is associated with the same number of RS ports and repetition factor as the first set of RS resources. can. That is, network device 110 may be configured such that a different subset of the predetermined set of RS resources is the second set of RS resources. Referring to FIG. 4B, for example, if the first number of RS ports is 4 and the first set of RS resources is configured to be 4-port RS resources 412, then 4-port RS resources 413 or 4-port RS resources 414 may be configured as a second set of RS resources. In some embodiments, the first set of RS resources and the second set of RS resources can be separated from each other in the frequency domain (as indicated by 4-port RS resources 412 and 4-port RS resources 413). Alternatively, in other embodiments, the first set of RS resources is at least partially overlapping with the second set of RS resources (as shown by 4-port RS resources 412 and 4-port RS resources 414). good too. Similarly, if the first number of RS ports is two and the first set of RS resources is set to 2-port RS resources 415, then any of the 2-port RS resources 416-419 is the second of the RS resources. It may be set as a set.

In some embodiments, the network device may configure the second set of RS resources based on shift values in the frequency and/or time domain. For example, network device 110 may configure the second set of RS resources by shifting at least a portion of the first set of REs using the shift value. In one embodiment, as shown in FIG. 4B, if the first set of RS resources is configured to be 4-port RS resources 412, the second set of RS resources is at least one of the 4-port RS resources 412 An example of a second set of RS resources may be shown as 413-414. Alternatively, if the first set of RS resources is configured to be 2-port RS resources 415, the second set of RS resources may be configured by shifting at least a portion of the 2-port RS resources 415. Well, examples of the second set of RS resources may be denoted as 416-419. Alternatively, if the first set of RS resources is configured to be 1-port RS resources 420, the second set of RS resources may be configured by shifting at least a portion of the 1-port RS resources 420. Well, examples of the second set of RS resources may be denoted as 421-427.

In another embodiment, FIGS. 7A and 7D illustrate examples of configuring a second set of RS resources according to some embodiments of the present disclosure. As shown in FIG. 7D, if the first set of RS resources is configured to be 4-port RS resources 740, the second set of RS resources shifts at least a portion of the 4-port RS resources 740. and an example of a second set of RS resources may be shown as 710 in FIG. 7A. Alternatively, as shown in FIG. 7D, if the first set of RS resources is configured to be 2-port RS resources 741, the second set of RS resources shifts at least a portion of the 2-port RS resources 741. and an example of the second set of RS resources may be shown as 721-723 in FIG. 7A. Alternatively, as shown in FIG. 7D, if the first set of RS resources is configured to be 1-port RS resources 742, the second set of RS resources shifts at least a portion of the 1-port RS resources 742. and an example of the second set of RS resources may be shown as 724-730 in FIG. 7A.

In some embodiments, the network device configures the second set of RS resources to have a higher density than the first set of RS resources with the second set of RS resources being associated with the same number of RS ports as the first set of RS resources. may be configured to have For example, the second set of RS resources may be associated with a smaller repetition factor than the first set of RS resources.
In one embodiment, FIGS. 7B and 7D illustrate examples of configuring the second set of RS resources according to some embodiments of the present disclosure. As shown in FIG. 7B, if the first set of RS resources is configured into 4-port RS resources 710 or 740, 4-port RS resources 731 or 732 may be configured into the second set of RS resources. If the first set of RS resources is configured into 2-port RS resources 741 or 722, 2-port RS resources 734 may be configured into the second set of RS resources. Alternatively, if the first set of RS resources is configured into 2-port RS resources 721 or 723, 2-port RS resources 733 or 735 may be configured into the second set of RS resources. Similarly, examples for 1-port RS resources are shown at 1-port RS resources 736 and 737 .

In some embodiments, the network device configures the second set of RS resources such that the second set of RS resources is associated with a different RS port number but the same repetition factor as the first set of RS resources. may be configured. For example, a second set of RS resources may be associated with a second number of RS ports, the second number being greater than the first number. In another example, the second number is a multiple of the first number. In this case, the second set of REs corresponding to the second set of RS resources in the frequency domain may include the first set of REs corresponding to the first set of REs with the same indexing. . In this regard, FIG. 7C illustrates an example of configuring a second set of RS resources according to some embodiments of the present disclosure. As shown in FIG. 7C, if the first set of RS resources is configured as 4-port RS resources 740, then the second set of RS resources may be configured as 8-port RS resources 738. FIG.

In some embodiments, the network device is configured such that the second set of RS resources is associated with a different RS port number than the first set of RS resources, and the second set of RS resources is the first set of REs with the same index. A second set of REs may be configured to be included in the set.

In one embodiment, FIG. 7D illustrates an example of configuring the second set of RS resources according to some embodiments of the present disclosure. As shown in FIG. 7D, if the first set of RS resources is configured as 8-port RS resources (eg, 8-port RS resources 739) and the second number of RS ports is 4, then the second set of RS resources is , may be configured for four RS ports. A second set of RS resources may be included in the 8-port RS resource, and the indices of the 4 RS ports in the 4-port resource (i.e., the second set of RS resources) are the indices of the 4 ports in the 8-port RS resource. It can be the same as the index. An example of a second set of RS resources for four RS ports is shown as 740 . Alternatively, if the second number of RS ports is 2, the second set of RS resources may be configured for the two RS ports, and the second set of RS resources may be 8-port resources and/or 4-port resources. included, and the indices of the two RS ports may be the same as the indices of the two ports in the 8-port resource 739 and/or the 4-port resource 740 . An example of a second set of RS resources for two RS ports is shown as 741 . Alternatively, if the second number of RS ports is one, the second set of RS resources may be configured for one RS port. The second set of RS resources may be included in 8-port RS resources, 4-port RS resources, and/or 2-port RS resources, where the index for one RS port is 8-port RS resource 739, 4-port RS. It may be the same as resource 740 and/or 2-port RS resource 741 . An example of the second set of RS resources for one RS port is shown as 742 . It will be seen that the port RS resource 740 is contained in the 8 port RS resource 739 with the same index for the 4 RS ports. 2-port RS resource 741 is included in 8-port RS resource 739 and/or 4-port RS resource 740 with the same index for the two RS ports. 1-port RS resources 742 are included in 8-port resources 739, 4-port resources 740, and/or 2-port resources 741 with the same index for one RS port.

Referring again to FIG. 6, method 600 proceeds to operation 620, where terminal device 110 configures an RS configuration for RS transmission (referred to below as "second RS") based on a second set of RS resources. configuration). A second RS configuration may specify a second set of RS resources to be used for RS transmission.

At operation 630 , network device 110 transmits information regarding the second RS configuration to terminal device 120 . The information may indicate to terminal device 120 one or more aspects of the RS transmission specified in the second RS configuration. For example, based on the configured second RS configuration, the information may indicate to terminal device 120 that the second set of RS resources will be used in RS transmissions.

In some embodiments, information about its RS configuration may include an indication of the corresponding RPF. FIG. 8A shows an example of RPF indication in RS configuration, according to some embodiments of the present disclosure. For example, a network device may configure multiple sets of RPF values for one RS configuration, as shown in FIG. 8A. The RS configuration may also include at least one configuration such as time and/or frequency resources, transmission pattern, number of RS ports, at least one RS sequence. In another embodiment, different RPF configurations for different RS configurations may be different. In another embodiment, only one RPF value may be supported for some RS configurations, and thus a corresponding RPF indication may not be required for that RS configuration.

In another embodiment, the information about that RS configuration may include an indication of the corresponding RPF value. For example, the network device may have already configured the first set of RS resources for RS transmission via the first RS configuration. In this case, the network device may further configure the second set of RS resources for the RS transmission by indicating a different RPF applied to the first set of RS resources. For example, information about the second RS configuration may include an optional field indicating the corresponding RPF. In this regard, FIG. 8B illustrates example information regarding the second RS configuration according to some embodiments of the present disclosure. As shown in FIG. 8B, if the first configuration corresponds to 4-port RS resources 810 already configured in terminal device 120 (i.e., the first set of RS resources), network device 110 An RPF value of 2 or 4 may be indicated to terminal device 120 in the information. That is, the 4-port RS resource 810 can support different RPF values for different RS configurations. However, the other three RS configurations 820-840 only support an RPF value of two. In this case, information about the other three RS configurations 820-840 may not have fields to indicate RPF values.

Returning to FIG. 6, method 600 moves to operation 640, where terminal device 120 receives information from network device 110 regarding a second RS configuration. Terminal device 120 may determine how RS transmissions are performed from the second RS configuration. For example, terminal device 120 may be configured with a second set of RS resources used for RS transmission. Terminal device 120 may be configured with a second set of RS resources corresponding to a second set of REs interpolated by unused REs in the frequency domain.

At operation 650, network device 110 may transmit at least one RS sequence to terminal device 120 based on the second configuration. For example, network device 110 may transmit at least one sequence using the second set of configured RS resources. Then, on the receiving side of the RS transmission, at operation 660, terminal device 120 may detect at least the sequence based on the second RS configuration.

To support detection of different RS sequences simultaneously, FIG. 9 shows a process 900 for RS transmission according to some embodiments of the present disclosure. For discussion purposes, process 900 is described with reference to FIG. Process 900 may include network device 110 and one or more terminal devices 120 served by network device 110 . It should be appreciated that process 900 may also comprise additional acts (not shown) and/or may omit the illustrated acts. The scope of the disclosure described herein is not limited to this aspect.

At operation 910 , network device 110 generates a third RS configuration for at least one RS sequence to be transmitted to terminal device 120 . In some embodiments, examples of RS sequences may include, but are not limited to, pseudorandom noise (PN) sequences, Zadoff-Chu (ZC) sequences, and the like.

In some embodiments, the third RS configuration for at least one RS sequence may be dependent on the first RS configuration or the second RS configuration. In other embodiments, the third RS configuration may be included in the first RS configuration or the second RS configuration. That is, the first RS configuration or the second RS configuration may include configurations regarding both RS resources and RS sequences.

In some embodiments, the third RS configuration may indicate the number of RS sequences in at least one RS sequence to be transmitted. Alternatively, the third RS configuration may indicate which RS resources should be used to transmit different RS sequences.

In some embodiments, the third RS configuration may indicate that different RS sequences are transmitted on the same RS resource. In other embodiments, for example, the third RS configuration may indicate that different RS sequences are transmitted on different RS resources. 10A and 10B are diagrams illustrating example resource mappings for different RS sequences according to some embodiments of the present disclosure. In FIG. 10A, different RS sequences 1010 are mapped to the same RS resource. In FIG. 10B, different RS sequences 1010 are mapped to different RS resources.

For example, in some embodiments the at least one RS sequence may include at least a first RS sequence and a second RS sequence. A third RS configuration may indicate that the first RS sequence is sent on the first set of RS resources and that the second RS sequence is sent on the second set of RS resources. 11A and 11B show example resource mappings for different RS sequences according to some embodiments of the present disclosure. 11A, RS sequence 1110 and RS sequence 1120 are mapped to 4-port RS resource 1130. In FIG. In FIG. 11B, RS sequence 1110 is mapped to 4-port RS resource 1140 and RS sequence 1120 is mapped to another 4-port RS resource 1150 .

Returning to FIG. 9, process 900 moves to operation 920 where network device 110 transmits information regarding the third RS configuration to terminal device 120 .

In some embodiments, information regarding the third RS configuration may be sent via high level signaling and/or dynamic signaling. Examples of high-level signaling include, but are not limited to, signaling at the Radio Resource Control (RRC) layer or the Media Access Control (MAC) layer. Examples of dynamic signaling include, but are not limited to, Downlink Control Information (DCI).

In some embodiments, network device 110 may perform multi-level construction for multiple RS sequences. For example, network device 110 may configure L (L≧1) RS sequences for terminal device 120 via higher layer signaling. Next, the network device 110 configures G (1≤G≤L) RS sequences from the L RS sequences for the number of terminal devices 120 via higher layer signaling or dynamic signaling. good too.

At operation 930, terminal device 120 receives from network device 110 a third RS configuration for at least one RS sequence. Terminal device 120 may be configured with the number of RS sequences to be transmitted. Terminal device 120 may also be configured with which RS resources are used to transmit different RS sequences. In some embodiments, terminal device 120 may be configured with information that different RS sequences are transmitted on the same RS resource. In other embodiments, terminal device 120 may be configured with information that different RS sequences are transmitted on different RS resources. Specifically, in some embodiments, the at least one RS sequence may include at least a first RS sequence and a second RS sequence. Terminal device 120 may be configured with information that the first RS sequence should be sent on the first set of RS resources and the second RS sequence should be sent on the second set of RS resources.

At operation 940, network device 110 may transmit at least one RS sequence to terminal device 120 based on the third configuration.
Next, at operation 950, terminal device 120 may detect at least one RS sequence based on the third RS configuration.

Terminal device 120 may detect at least one RS sequence using the RS resources indicated by the third RS configuration. For example, in some embodiments, the third RS configuration may indicate that at least one RS sequence is transmitted using the first set of RS resources. In this case, terminal device 120 may detect at least one RS sequence using the first set of RS resources. In other embodiments, the at least one RS sequence may include at least a first RS sequence and a second RS sequence. The third RS configuration may indicate that the first RS sequence is transmitted on the first set of RS resources and that the second RS sequence is transmitted on the second set of RS resources. In this case, terminal device 120 may detect the first RS sequence on the first set of RS resources and detect the second RS sequence on the third set of RS resources.

In view of the above, the proposed solution for RS transmission can provide a nested structure of RS resources based on IFDMA technology. This nested structure of RS resources can support multiple repeated signals within one symbol in the time domain, so that a terminal device can detect multiple beams within one symbol. Furthermore, using this solution, multiple RS sequences may be mapped to different or same multiple RS resources so that the terminal device can detect multiple RS sequences simultaneously. Therefore, solutions according to embodiments of the present disclosure can significantly reduce overhead and latency for RS transmissions.

Additionally, the proposed solution may provide considerations for some other aspects of RS transmission.

For example, in some embodiments, RS resources for beam management may not be used for interference measurement. For example, some RS configurations may be configured for beam management. Those RS configurations may indicate some resources for RS transmission, and the resources indicated by that RS configuration may not be configured as resources for interference measurements.

In some embodiments, RS resources for beam management may be configured in partial bands. For frequencies outside this subband, other signals (Physical Downlink Shared Channel, Physical Downlink Control Channel, Synchronization Signal Block) are used instead of the RS. etc.) may be sent. For other signal transmissions, the same RPF value as for RS transmissions may be applied.

In some embodiments, the ability to detect multiple beams within one symbol may depend on the capabilities of the terminal device. For example, in one embodiment, terminal devices may have different capabilities for detecting RSs. A terminal device may report information about its capabilities to a network device. In other embodiments, the network device may receive information about capabilities, and the network device may configure the RS with an RPF value K based on the information about the capabilities. In another embodiment, the terminal device may have different capabilities for detecting RSs, and the reported information may differ based on the different capabilities. For example, in one embodiment, a terminal device may have different capabilities for detecting RSs, and a terminal device may detect multiple beams within one symbol. In this case, the terminal device may select one or more beams within one symbol and report the selection to the network device.

In some embodiments, power boosting may be applied to a set of RS resources allocated for RS transmission. The power of RS transmissions for beam management may be different than the power of other RS transmissions, eg, RS transmissions for CSI acquisition. In some embodiments, the power of RS transmissions may have different power values based on the RPF value and/or the number of RS ports. In one embodiment, the power values may be different for different RPF configurations, eg, as shown in FIG. 12A. In another embodiment, the power values may be different for different numbers of RS ports, eg, as shown in FIG. 12B.

In one embodiment, a network device may configure different power parameters for terminal devices, and different power parameters may be associated with different RPF values and/or different numbers of RS ports. In another embodiment, the network device may configure information regarding the reference power to the terminal device. The network may configure different power offset values relative to the reference power for RS transmissions with different PRF values and/or different numbers of RS ports. For example, information about its reference power may be used to indicate the power of the RS transmission for reference. In another example, information about reference power may be used for RS transmissions with a fixed RPF value K and/or a fixed number of RS ports H.

In some embodiments, the configuration of SRS transmission may be associated with the RS configuration. For example, at least some of the multiple SRS configurations may be mapped to at least some of the CSI-RS configurations, where the multiple SRS configurations are multiple SRS resources, multiple SRS sequences, multiple SRS transmission bands, etc. may include information about at least one of Further, the CSI-RS configuration may indicate at least one of CSI-RS resources, CSI-RS port indices, and so on. In one embodiment, at least some of the SRS resources and/or SRS sequences are mapped to at least some of the CSI-RS resources, such as one or more CSI-RS ports, for example. For example, as shown in FIG. 13, different SRS configurations may be associated with different CSI-RS ports. For example, each CSI-RS port corresponds to one beam. For example, when a terminal device selects one beam, the terminal device can transmit SRS using the associated CSI-RS port.

FIG. 14 shows a block diagram of an apparatus 1400 according to some embodiments of the present disclosure. Apparatus 1400 may be considered an exemplary implementation of network device 110 shown in FIG. As shown, apparatus 1400 includes a determining module 1410 configured to determine a first set of reference signal (RS) resources for RS transmissions by network devices. The first set of RS resources is associated with a first number of RS ports used for RS transmission and corresponds to a first set of resource elements (REs) interpolated with unused REs in the frequency domain. do. Apparatus 1400 also includes a generating module 1420 configured to generate a first RS configuration for RS transmission based on the first set of RS resources. Additionally, the apparatus 1400 may also include a transmission module 1430 configured to transmit information regarding the first RS configuration to terminal devices served by the network device.

FIG. 15 shows a block diagram of an apparatus 1500 according to some embodiments of the present disclosure. Apparatus 1500 can be considered an exemplary implementation of terminal device 120 shown in FIG. As shown, apparatus 1500 includes a receive module 1510 configured to receive information from a network device regarding a first reference signal (RS) configuration for RS transmissions by the network device. The first RS configuration is determined based on the first set of RS resources for RS transmission. The first set of RS resources is associated with a first number of RS ports used for RS transmission and corresponds to a first set of resource elements (REs) interpolated with at least one unused RE in the frequency domain. do. Apparatus 1500 also includes a detection module 1520 configured to detect at least one RS sequence based on the first RS configuration.

For clarity, FIGS. 14 and/or 15 do not show some optional modules of apparatus 1400 and/or apparatus 1500. FIG. However, it should be understood that various features described with reference to FIGS. 1-13 are applicable to apparatus 1400 and/or apparatus 1500. FIG. Further, each module of device 1400 and/or device 1500 may be a hardware module or a software module. For example, in some embodiments, apparatus 1400 and/or apparatus 1500 may be partially or fully implemented by software and/or firmware, eg, implemented as a computer program product embodied on a computer readable medium. Alternatively or additionally, apparatus 1400 and/or apparatus 1500 may be implemented partially or fully based on hardware, e.g. It may be implemented as a circuit (ASIC: application-specific integrated circuit), a system on chip (SOC: system on chip), a field programmable gate array (FPGA: field programmable gate array), or the like. The scope of the present disclosure is not limited to this aspect.

FIG. 16 is a simplified block diagram of a device 1600 suitable for implementing embodiments of the present disclosure. Device 1600 may be considered a further exemplary implementation of network device 110 or terminal device 120 shown in FIG. As such, device 1600 may be implemented in, or at least part of, network device 110 or terminal device 120 .

As shown, the device 1600 has a processor 1610, a memory 1620 connected to the processor 1610, a suitable transmitter (TX) and receiver (RX) 1640 connected to the processor 1610, and a TX/RX 1640. communication interface. Memory 1610 stores at least part of program 1630 . TX/RX 1640 is for two-way communication. The TX/RX 1640 has at least one antenna to facilitate communication, although in practice the access nodes referred to in this application may have multiple antennas. The communication interface is an X2 interface for two-way communication between eNBs, an S1 interface for communication between MME (Mobility Management Entity) / S-GW (Serving Gateway) and eNB, eNB and relay node (RN) It may represent the interface required for communication with other network elements, such as the Un interface for communication between eNBs or the Uu interface between an eNB and a terminal device.

Program 1630, when executed by associated processor 1610, enables device 1600 to operate in accordance with embodiments of the present disclosure as described herein with reference to FIGS. 1-13. It is assumed to contain program instructions. Embodiments herein may be implemented by computer software executable by processor 1610 of device 1600, by hardware, or by a combination of software and hardware. Processor 1610 may be configured to implement various embodiments of the present disclosure. Further, the combination of processor 1610 and memory 1610 may form processing means 1650 adapted to implement various embodiments of the present disclosure.

The memory 1610 may be of any type suitable for local technology networks and includes, as non-limiting examples, non-transitory computer readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, It may be implemented using any suitable data storage technology, such as optical memory devices and systems, fixed memory, and removable memory. Although only one memory 1610 is shown in device 1600, device 1600 may have several physically different memory modules. Processor 1610 may be of any type suitable for local technology networks and includes, as non-limiting examples, general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), and multi-core processor architectures. may include one or more processors based on Device 1600 may have multiple processors, such as application specific integrated circuit chips, temporally dependent on a clock that synchronizes the main processor.

In general, various embodiments of the present disclosure may be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor, or other computing device. While various aspects of the embodiments of the disclosure are illustrated and described as block diagrams, flowcharts, or some other pictorial representation, any block, device, system, technique or method described herein may be used. may be implemented in hardware, software, firmware, dedicated circuitry or logic, general purpose hardware or controllers or other computing devices, or some combination thereof, as non-limiting examples. may

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. A computer program product may comprise instructions, such as instructions contained in a program module, to be executed on a device on a target real or virtual processor to perform the processes or methods described above with reference to any of Figures 1-13. , including computer-executable instructions. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote storage media.

Program code for executing methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, renders the flowcharts and /or cause the functions/acts identified by the block diagrams to be performed. Program code may run entirely on a machine, partly on a machine, partly on a machine and partly on a remote machine, or entirely on a remote machine or server, as a stand-alone software package. may

The above program code is embodied in a machine-readable medium, which can be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. can be A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More specific examples of machine-readable storage media include electrical connections having one or more wires, portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read including dedicated memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

Further, although acts have been presented in a particular order, this does not mean that such acts are performed in the particular order or sequential order presented, or that all of the acts are performed in order to achieve a desired result. It should not be understood as requiring that the indicated actions be performed. Multitasking and parallelism can be advantageous in certain situations. Similarly, although some specific implementation details have been included in the discussion above, these should not be construed as limitations on the scope of the disclosure, but as illustrations of features unique to particular embodiments. is. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

While the disclosure has been described in language specific to structural features and/or methodological acts, it is understood that the disclosure, as defined in the appended claims, is not necessarily limited to the specific features or acts described above. want to be Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (12)

A method performed by a user equipment (UE), comprising:
receiving configuration information for a first resource for a channel state information reference signal (CSI-RS), the configuration information configuring a partial frequency band for the CSI-RS;
receiving the CSI-RS on the first resource;
transmitting a sounding reference signal (SRS) on an SRS resource associated with the first resource based on receiving the CSI-RS;
including
the first resource is within the partial frequency band, and the UE does not receive CSI-RS outside the partial frequency band;
Method. Information related to beams for transmission of the SRS is determined by the UE;
The method of claim 1. the SRS resource is a frequency domain resource configured by an SRS resource configuration;
The method of claim 1. Selecting the SRS configuration based on the detected beams of the CSI-RS by the UE using an RS configuration received from a base station;
The method of claim 1. A method performed by a base station, comprising:
Transmitting configuration information for a first resource for a channel state information reference signal (CSI-RS), the configuration information configuring a partial frequency band for the CSI-RS, to a user equipment (UE). and
transmitting the CSI-RS to the UE on the first resource;
receiving a sounding reference signal (SRS) on an SRS resource associated with the first resource;
including
the SRS is transmitted by the UE based on reception of the CSI-RS;
the first resource is within the partial frequency band, and the base station does not transmit CSI-RS outside the partial frequency band;
Method. Information related to beams for transmission of the SRS is determined by the UE;
6. The method of claim 5. the SRS resource is a frequency domain resource configured by an SRS resource configuration;
6. The method of claim 5. further comprising sending an RS configuration to the UE;
The RS configuration is used to select the SRS configuration based on the CSI-RS beam detected at the UE,
6. The method of claim 5. A user equipment (UE),
a controller;
a transceiver;
and
The controller performs channel state information reference signal (CSI-RS) measurements;
The transceiver is
receiving configuration information for a first resource for the CSI-RS, the configuration information configuring a partial frequency band for the CSI-RS;
receiving the CSI-RS on the first resource;
transmitting a sounding reference signal (SRS) on an SRS resource associated with the first resource based on receiving the CSI-RS;
the first resource is within the partial frequency band, and the UE does not receive CSI-RS outside the partial frequency band;
U.E. the controller determines beam-related information for transmission of the SRS;
The UE of claim 9. the SRS resource is a frequency domain resource configured by an SRS resource configuration;
The UE of claim 9. The controller selects the configuration of the SRS based on the detected beams of the CSI-RS using RS configurations received from base stations;
The UE of claim 9.

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