Srs signaling in 5g new radio wireless communications

Abstract

A base station is configured to determine a sounding reference signal (SRS) configuration having a plurality of cyclic shifts for a comb-8 SRS, a plurality of user equipment (UE) ports for transmission of the comb-8 SRS, and a mapping of the plurality of cyclic shifts to the plurality of UE ports. The base station is further configured to transmit the SRS configuration to the UE.

Description

BACKGROUND

[0001] When establishing a network connection, such as a connection to a 5G New Radio (NR) network, a user equipment (UE) transmits a sounding reference signal (SRS) to a next generation NodeB (gNB) to inform the gNB of uplink channel conditions. Based on the received SRS signal, the gNB can configure physical resources for the UE for communication between the UE and the gNB. SUMMARY

[0002] Some example embodiments relate to a processor of a base station configured to perform operations. The operations include determining a sounding reference signal (SRS) configuration and transmitting the SRS configuration to a UE, the SRS configuration having a plurality of cyclic shifts for a comb-8 SRS, a plurality of user equipment (UE) ports for transmitting the comb-8 SRS, and a mapping of the plurality of cyclic shifts to the plurality of UE ports.

[0003] Other example embodiments relate to a base station having a transceiver configured to communicate with a user equipment (UE) and a processor communicatively coupled to the transceiver and configured to perform operations. The operations include determining a sounding reference signal (SRS) configuration and transmitting the SRS configuration to a UE, the SRS configuration having a plurality of cyclic shifts for a comb-8 SRS, a plurality of user equipment (UE) ports for transmitting the comb-8 SRS, and a mapping of the plurality of cyclic shifts to the plurality of UE ports.

[0004] Further example embodiments relate to a processor of a base station configured to perform operations. The operations include determining a resource block (RB) level partial frequency sounding (RPFS) configuration and transmitting the RPFS configuration to a UE, the RB level RPFS configuration having a configured subband size, an RPFS factor to be applied to the configured subband size, a reduced subband size based on the configured subband size and the RPFS factor, and a resulting sounding reference signal (SRS) sequence length based on the configured subband size and the RPFS factor.

[0005] Additional example embodiments relate to a base station having a transceiver configured to communicate with a user equipment (UE) and a processor communicatively coupled to the transceiver and configured to perform operations. The operations include determining a resource block (RB) level partial frequency sounding (RPFS) configuration and transmitting the RPFS configuration to a UE, the RB level RPFS configuration having a configured subband size, an RPFS factor to be applied to the configured subband size, a reduced subband size based on the configured subband size and the RPFS factor, and a resulting sounding reference signal (SRS) sequence length based on the configured subband size and the RPFS factor. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 An exemplary network arrangement is shown in accordance with various exemplary embodiments.

[0007] Figure 2 An exemplary user equipment (UE) is shown in accordance with various exemplary embodiments.

[0008] Figure 3 An exemplary base station is shown in accordance with various exemplary embodiments.

[0009] Figure 4 A method of configuring comb-8 sounding reference signal (SRS) is shown in accordance with various exemplary embodiments.

[0010] Figure 5 A method of configuring resource block (RB) level partial frequency sounding (RPFS) for SRS transmission is shown in accordance with various exemplary embodiments. DETAILED DESCRIPTION

[0011] Exemplary embodiments can be further understood with reference to the following description and related drawings in which like elements are referred to with the same reference numerals. The exemplary embodiments relate to configuring sounding reference signal (SRS) for support of comb-8 and resource block (RB) level partial frequency sounding (RPFS).

[0012] Exemplary embodiments are described with respect to a UE. However, reference to a UE is provided for illustrative purposes only. Exemplary embodiments can be used with any electronic component that can establish a connection with a network and is configured with hardware, software, and / or firmware for exchanging information and data with the network. Thus, a UE as described herein is used to represent any appropriate electronic component.

[0013] Further, exemplary embodiments are described with respect to a 5G New Radio (NR) network. However, reference to a 5G NR network is provided for illustrative purposes only. Exemplary embodiments can be used with any network that implements the functionality described herein.

[0014] To provide more flexibility in configuring SRS transmission to a 5G NR network, in Release 16 of 3GPP, it was agreed that SRS transmission can be transmitted in any symbol of a slot. However, SRS transmission has been limited to comb-1, comb-2, or comb-4, thus limiting the number of UEs that can be multiplexed by a gNB.

[0015] In accordance with some exemplary embodiments, a gNB configures a comb-8 SRS transmission and configures a cyclic shift, a number of ports, and a mapping of cyclic shifts to number of ports for the comb-8 SRS transmission.

[0016] Another limitation of current SRS configurations is that SRS transmissions can only be transmitted in contiguous physical resource blocks (PRBs), which limits the number of UEs that can be multiplexed in the same bandwidth.

[0017] According to further example embodiments, a gNB configures a UE with an RPFS factor for the UE to determine a subset of PRBs on which to transmit SRS, thereby allowing more UEs to be multiplexed on the same bandwidth.

[0018] Figure 1 An example network arrangement 100 according to various example embodiments is shown. The example network arrangement 100 includes a UE 110. It should be noted that any number of UEs can be used in the network arrangement 100. Those skilled in the art will understand that the UE 110 can be any type of electronic component configured to communicate via a network, such as a mobile phone, tablet, desktop computer, smart phone, phablet, embedded device, wearable device, Internet of Things (IoT) device, etc. It should also be understood that a practical network arrangement can include any number of UEs used by any number of users. Thus, only an example with a single UE 110 is provided for illustrative purposes.

[0019] The UE 110 can be configured to communicate with one or more networks. In the example network arrangement 100, the networks with which the UE 110 can wirelessly communicate are a 5G New Radio (NR) Radio Access Network (5G NR-RAN) 120, a LTE Radio Access Network (LTE-RAN) 122, and a Wireless Local Area Network (WLAN) 124. However, it should be understood that the UE 110 can also communicate with other types of networks, and that the UE 110 can also communicate with networks through wired connections. Thus, the UE 110 can include a 5G NR chipset to communicate with the 5G NR-RAN 120, an LTE chipset to communicate with the LTE-RAN 122, and an ISM chipset to communicate with the WLAN 124.

[0020] The 5G NR-RAN 120 and the LTE-RAN 122 can be part of a cellular network that can be deployed by a cellular provider (e.g., Verizon, AT&T, T-Mobile, etc.). These networks 120, 122 can include, for example, cells or base stations (NodeBs, eNodeBs, HeNBs, eNBS, gNBs, gNodeBs, macrocell base stations, microcell base stations, small cell base stations, femtocell base stations, etc.) configured to send and receive traffic from UEs equipped with the appropriate cellular chipset. The WLAN 124 can include any type of wireless local area network (WiFi, hotspots, IEEE 802.1 lx networks, etc.).

[0021] The UE 110 can connect to the 5G NR-RAN 120 via gNB 120A and / or gNB 120B. The gNBs 120A and 120B can be configured with the necessary hardware (e.g., antenna arrays), software, and / or firmware to perform massive multiple-input multiple-output (MIMO) functionality. Massive MIMO can refer to a base station configured to generate multiple beams for multiple UEs. During operation, the UE 110 can be within range of multiple gNBs. The reference to two gNBs 120A, 120B is for illustrative purposes only. The example embodiments can apply to any suitable number of gNBs. Additionally, the UE 110 can communicate with eNB 122A of the LTE-RAN 122 to transmit and receive control information for downlink and / or uplink synchronization relative to the 5G NR-RAN 120 connection.

[0022] Those skilled in the art will appreciate that any relevant procedures can be performed for the UE 110 to connect to the 5G NR-RAN 120. For example, as described above, the 5G NR-RAN 120 can be associated with a particular cellular provider at which the UE 110 and / or its user has agreement and credential information (e.g., stored on a SIM card). Upon detecting the presence of the 5G NR-RAN 120, the UE 110 can transmit the corresponding credential information in order to associate with the 5G NR-RAN 120. More specifically, the UE 110 can associate with a particular base station (e.g., gNB 120A of the 5G NR-RAN 120).

[0023] In addition to the networks 120, 122, and 124, the network arrangement 100 includes a cellular core network 130, the Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 can be viewed as an interconnected set of components that manage the operation and traffic of the cellular network. The cellular core network 130 also manages traffic that flows between the cellular network and the Internet 140. The IMS 150 can generally be described as an architecture for delivering multimedia services to the UE 110 using IP protocols. The IMS 150 can communicate with the cellular core network 130 and the Internet 140 to provide multimedia services to the UE 110. The network services backbone 160 is in direct or indirect communication with the Internet 140 and the cellular core network 130. The network services backbone 160 can generally be described as a set of components (e.g., servers, network storage arrangements, etc.) that implement a suite of services that can be used to extend the functionality of the UEs 110 in communicating with various networks.

[0024] Figure 2 An example UE 110 is shown in accordance with various example embodiments. Reference will be made to the example UE 110 in conjunction with the example network arrangement 100. Figure 1The UE 110 will be described with reference to the network arrangement 100. The UE 110 can represent any electronic device and can include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. The other components 230 can include, for example, an audio input device, an audio output device, a battery providing a limited power source, a data acquisition device, a port for electrically connecting the UE 110 to other electronic devices, one or more antenna panels, etc. For example, the UE 110 can be coupled to an industrial device via one or more ports.

[0025] The processor 205 can be configured to execute a number of engines of the UE 110. For example, the engines can include an SRS management engine 235. The SRS engine 235 can perform various operations related to receiving SRS configuration transmissions from the gNB 120A (or 120B) and transmitting SRS to the gNB.

[0026] The above engines are exemplary only as applications (e.g., programs) executed by the processor 205. The functionality associated with the engines can also be represented as separate, combined components of the UE 110, or can be modular components coupled to the UE 110, e.g., integrated circuits with or without firmware. For example, the integrated circuits can include input circuitry for receiving signals and processing circuitry for processing signals and other information. The engines can also be embodied as one application or as separate applications. Moreover, in some UEs, the functionality described with respect to the processor 205 is shared between two or more processors, such as a baseband processor and an application processor. The exemplary embodiments can be implemented in any of these or other configurations of the UE.

[0027] The memory arrangement 210 can be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 can be a hardware component configured to display data to a user, while the I / O device 220 can be a hardware component that enables a user to make inputs. The display device 215 and the I / O device 220 can be separate components or can be integrated together, such as a touch screen. The transceiver 225 can be a hardware component configured to establish a connection with the 5G NR-RAN 120, the LTE-RAN 122, the WLAN 124, etc. Thus, the transceiver 225 can operate on multiple different frequencies or channels (e.g., contiguous sets of frequencies).

[0028] Figure 3 An exemplary network base station, in this case a gNB 120A, is shown in accordance with various exemplary embodiments. The gNB 120A can represent any access node with which a UE 110 can establish a connection for a 5G NR network. Figure 3The illustrated gNB 120A can also represent the gNB 120B.

[0029] The gNB 120A can include a processor 305, memory arrangement 310, input / output (I / O) device 320, transceiver 325, and other components 330. The other components 330 can include, for example, a power source, data acquisition device, ports that electrically connect the gNB 120A to other electronic devices, etc.

[0030] The processor 305 can be configured to execute a number of engines of the gNB 120A. For example, the engines can include a SRS management engine 335 for performing operations including configuring comb 8 SRS and / or RE-level partial frequency sounding (RPFS) for SRS transmissions of the UE 110. Examples of this process will be described in greater detail below.

[0031] The engines described above are merely exemplary of applications (e.g., programs) executed by the processor 305. The functionality associated with the engines can also be represented as integrated components of the gNB 120A, or can be modular components coupled to the gNB 120A, e.g., integrated circuits with or without firmware. For example, the integrated circuits can include input circuitry for receiving signals and processing circuitry for processing signals and other information. Further, in some gNBs, the functionality described with respect to the processor 305 is split among multiple processors (e.g., a baseband processor, an application processor, etc.). The example aspects can be implemented in accordance with any of these or other configurations of the gNB.

[0032] The memory 310 can be a hardware component that is configured to store data related to operations performed by the UE 110, 112. The I / O device 320 can be a hardware component or port that enables a user to interact with the gNB 120A. The transceiver 325 can be a hardware component that is configured to exchange data with the UE 110 and any other UE in the system 100. The transceiver 325 can operate on various different frequencies or channels (e.g., a set of contiguous frequencies). Thus, the transceiver 325 can include one or more components (e.g., radio components) to enable data exchange with various networks and UEs.

[0033] Figure 4A method 400 of configuring comb-8 sounding reference signal (SRS) for a UE 110 is shown, in accordance with various example embodiments. At 405, the gNB 120A (or 120B) configures the number of cyclic shifts (phase ramps) for comb-8 SRS transmission. In some embodiments, the gNB 120A configures the UE 110 with a maximum of 6 cyclic shifts (0, 1, 2, 3, 4, and 5) for SRS transmission, regardless of the SRS sequence length. In some embodiments, the gNB 120A can configure the maximum number of cyclic shifts based on the SRS sequence length to advantageously allow a larger number of ports to be configured for SRS transmission. For example, in some embodiments, if the SRS sequence length is an integer multiple of 6 but not an integer multiple of 8 or 12, the gNB 120A is able to configure the UE 110 with a maximum of 6 cyclic shifts. If the SRS sequence length is an integer multiple of 8 but not an integer multiple of 12, the gNB 120A is able to configure the UE 110 with a maximum of 8 cyclic shifts (0, 1, 2, 3, 4, 5, 6, 7). If the SRS sequence length is an integer multiple of 12, the gNB 120A is able to configure the UE 110 with a maximum of 12 cyclic shifts (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11). In some embodiments, the minimum SRS subband size is configured to be 8 PRBs instead of the minimum of 4 PRBs specified by the current 3GPP standard. In such embodiments, the gNB 120A is able to configure the UE 110 with a maximum of 12 cyclic shifts (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11).

[0034] At 410, the gNB 120A configures the number of ports for comb-8 SRS transmission. In some embodiments, the gNB 120A configures the UE 110 with a maximum of 2 ports (1 or 2 ports) for SRS comb-8 transmission with 6 cyclic shifts (since 6 is divisible by 1 or 2). In some embodiments, the gNB 120A configures the UE 110 with a maximum of 4 ports (1, 2, or 4 ports) for SRS comb-8 transmission with 8 or 12 cyclic shifts (since 8 and 12 are both divisible by 1, 2, or 4). In some embodiments, when the maximum number of configured cyclic shifts is 6, the gNB 120A is able to configure the UE with a maximum of 6 ports (in addition to 1 or 2 ports) for SRS transmission. In some embodiments, when the minimum SRS subband size is configured to be 8 PRBs instead of the minimum of 4 PRBs specified by the current 3GPP standard, the gNB 120A is able to configure the UE 110 with a maximum of 4 ports (1, 2, or 4) for SRS transmission.

[0035] At 415, the gNB 120A maps the configured cyclic shifts to the configured UE 110 ports. In some embodiments, the gNB 120A maps the cyclic shifts to the configured ports to ensure that the cyclic shifts are equally spaced apart when mapped to the ports. For example, when 6 cyclic shifts (0, 1, 2, 3, 4, 5) are configured, and 2 ports are configured, the gNB 120A can map the first port as 0 and the second port as 3 to ensure that the distance between the mapped cyclic shifts is equal. It should be noted that other mapping combinations can also achieve this result (e.g., 1 and 4, 2 and 5, etc.). This equally spaced apart mapping also applies to embodiments where a maximum of 8 and 12 cyclic shifts are configured with a maximum of 4 ports.

[0036] When comb-8 SRS transmission is configured with a maximum of 6 cyclic shifts, the phase ramp value is defined by where i is the corresponding cyclic shift (0, 1, 2, 3, 4, 5). In some embodiments, the gNB 120A can alternatively explicitly configure the cyclic shift phase ramp for each SRS port. Thus, the gNB 120A can multiplex more users using the same comb offset compared to the equally spaced apart mapping described above. In such embodiments, the gNB 120A can support a 6-port configuration when the cyclic shift phase ramp is explicitly indicated as described.

[0037] In some embodiments, when comb-8 SRS transmission is configured with a maximum of 6 cyclic shifts, to support a 4-port configuration, the cyclic shift -n8 can be mapped to the corresponding port based on

[0038] where where a i is the phase ramp of SRS port i, is the maximum number of cyclic shifts, is the configured cyclic shift (0, 1, 2, 3, 4, 5 for a maximum of 6 cyclic shifts), and p i is the port index of SRS port i. Thus, the number of cyclic shifts does not have to be an integer multiple of the number of ports, thus allowing the gNB 120A to freely indicate the mapping of cyclic shifts to each port. At 420, the gNB 120A transmits the SRS configuration of 405-415 to the UE 110. The gNB 120A can include this SRS configuration in a RRC configuration message.

[0039] Figure 5 A method 500 of configuring resource block (RB) level partial frequency sounding (RPFS) for SRS transmission is shown in accordance with various example embodiments. At 505, the gNB 120A configures an SRS subband size It can be based on Table 6.4.1.4.3-1 of 3GPP TS 38.211. At 510, the gNB 120A is configured with the RPFS factor (P f This makes the subband size divided by the RPFS factor. RPFS is generated for SRS transport. In some implementations, P... f The determination can be based on one or more constraints. In some implementations, one or more constraints may be that the resulting RPFS value must be an integer. In some implementations, one or more constraints may additionally or alternatively be that the resulting RPFS value must be an integer multiple of 4. In some implementations, one or more constraints may additionally or alternatively be that the resulting RPFS value must be a subband size listed in Table 6.4.1.4.3-1 of 3GPP TS38.211. One of them. For example, if the configured subband size It is 224 and P f If the value is 2, then the RPFS will be 112, which is one of the subband sizes listed in Table 6.4.1.4.3-1 of 3GPP TS 38.211. In some implementations, one or more constraints may additionally or alternatively require that the resulting RPFS value derive from an SRS sequence length supported by 3GPP Release 16 (e.g., sequence lengths of 6, 12, 18, 24 ≥ 36). The sequence length can be based on...

[0040]

[0041] Where K TC It is the comb size, and 12 is the number of resource elements (REs) in the PRB. In the example above, when P f It is 2 and the comb size (K) TC When ) is 4, RPFS is 112 and generates a sequence with a length of 168, which is greater than 36 and satisfies the constraint.

[0042] In some implementations, non-integer values ​​may be allowed. In such an implementation, RPFS can be rounded (upper bound rounding, lower bound rounding, or nearest-neighbor rounding) to the subband size listed in Table 6.4.1.4.3-1 of 3GPP TS 38.211. one. For example, if the RPFS value is 86.5, the lower rounding of the value would result in a subband size of 80, the upper rounding would result in a subband size of 88, and the nearest rounding would result in a subband size of 88. In some embodiments, the non-integer RPFS value can alternatively be rounded (lower rounding, upper rounding, or nearest rounding) to the nearest integer that is a multiple of 4. In the example above for the RPFS value of 86.5, the lower rounding of the value would result in a subband size of 84, the upper rounding would result in a subband size of 88, and the nearest rounding would result in a subband size of 88. In some embodiments, the non-integer RPFS value can alternatively be rounded (lower rounding, upper rounding, or nearest rounding) to the nearest value that would result in an SRS sequence length supported by 3GPP Release 16 (e.g., sequence lengths of 6, 12, 18, 24 > 36). In the example above for the RPFS value of 86.5 and the comb size (K TC ) of 4, the lower rounding would result in a subband size of 86, the upper rounding would result in a subband size of 87, and the nearest rounding would result in a subband size of 87.

[0043] At 515, the gNB 120A determines an SRS sequence length based on the RPFS value. If the RPFS value results in an SRS sequence length that is not supported by 3GPP Release 16 (e.g., sequence lengths of 6, 12, 18, 24 > 36), then in some embodiments, the RPFS value (P F ) is not allowed. In some embodiments, the resulting RPFS can alternatively be rounded (lower rounding, upper rounding, or nearest rounding) to the nearest SRS sequence length supported by 3GPP Release 16 (e.g., sequence lengths of 6, 12, 18, 24 > 36). For example, if the RPFS value results in an SRS sequence length of 14.7, then the lower rounding of the sequence length is 12, the upper rounding is 18, and the nearest rounding is 12. In some embodiments, the currently supported SRS sequence lengths can alternatively be truncated. In such embodiments, the sequence length resulting from the RPFS is rounded (lower rounding, upper rounding, or nearest rounding) to an integer sequence length. Subsequently, a base sequence is selected from the currently supported SRS sequence lengths (6, 12, 18, 24 > 36). In some embodiments, a base sequence that is the same or longer than the sequence length resulting from the RPFS is selected. In some embodiments, a base sequence that is the same or longer than the sequence length resulting from the RPFS is selected, except that the base sequence length must be greater than or equal to 36. Finally, the selected base sequence length is truncated. At 520, the gNB 120A transmits the RPFS configuration to the UE 110.

[0044] Those skilled in the art will appreciate that the exemplary embodiments described above can be implemented in any suitable software configuration or hardware configuration, or a combination thereof. Exemplary hardware platforms for implementing the exemplary embodiments can include, for example, Intel x86-based platforms with compatible operating systems, Windows OS, Mac platforms and MAC OS, mobile devices with operating systems such as iOS, Android, and the like. Exemplary embodiments of the above-described methods can be embodied as a program including code lines stored on a non-transitory computer-readable storage medium, which, when compiled, can be executed on a processor or microprocessor.

[0045] While this patent application describes various combinations of various embodiments each having different features, those skilled in the art will appreciate that any feature of one embodiment can be combined with features of other embodiments or features that are not inconsistent with the operation or functioning of the devices of the disclosed embodiments or that do not render said functionality inconsistent, in any manner not expressly disclosed, without departing from the spirit or scope of the present disclosure.

[0046] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled in a way to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.

[0047] It will be apparent to those skilled in the art that various modifications can be made to the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.

Claims

1. An apparatus comprising a processor configured to cause a base station to perform operations, the operations including: Determine the SRS configuration for the detection reference signal, the SRS configuration including: Multiple cyclic shifts for comb-shaped 8 SRS; Multiple user equipment (UE) ports used for transmitting the comb-shaped 8 SRS; and The mapping of the plurality of cyclic shifts to the plurality of UE ports, when the SRS sequence length is an integer multiple of 6, has a maximum number of cyclic shifts of 6; and The SRS configuration is generated for transmission to the UE.

2. The apparatus according to claim 1, wherein, The maximum number of cyclic shifts is based on the SRS sequence length.

3. The apparatus according to claim 2, wherein, When the length of the SRS sequence is an integer multiple of 6 instead of an integer multiple of 8 or 12, the maximum number of the plurality of UE ports is 2 ports.

4. The apparatus according to claim 2, wherein, When the length of the SRS sequence is a multiple of 8 but not a multiple of 12, the maximum number of the plurality of cyclic shifts is 8 cyclic shifts, and the maximum number of the plurality of UE ports is 4 ports.

5. The apparatus according to claim 2, wherein, When the length of the SRS sequence is an integer multiple of 12, the maximum number of the plurality of cyclic shifts is 12 cyclic shifts, and the maximum number of the plurality of UE ports is 4 ports.

6. The apparatus according to claim 1, wherein, The maximum number of UE ports is 6.

7. The apparatus according to claim 1, wherein, Mapping the six cyclic shifts to the multiple ports includes configuring each port. The phase ramp value of π, where i is the corresponding 1 cyclic shift in the 6 cyclic shifts.

8. The apparatus according to claim 1, wherein, The minimum subband size of the comb-shaped 8 SRS is 8 Physical Resource Blocks (PRBs).

9. The apparatus according to claim 1, wherein, The maximum number of ports is four, and the mapping includes configuring the following phase ramp value for each of the four ports: in It is the phase ramp of SRS port i. It is the maximum number of circular shifts. It is one of the six cyclic shifts configured, and It is the port index of SRS port i.

10. A base station, comprising: A transceiver configured to communicate with a user equipment (UE); as well as A processor, communicatively coupled to the transceiver and configured to perform operations including: Determine the SRS configuration for the detection reference signal, the SRS configuration including: Multiple cyclic shifts for comb-shaped 8 SRS; Multiple user equipment (UE) ports used for transmitting the comb-shaped 8 SRS; and The mapping of the plurality of cyclic shifts to the plurality of UE ports, when the SRS sequence length is an integer multiple of 6, has a maximum number of cyclic shifts of 6; and The SRS configuration is generated for transmission to the UE.

11. The base station according to claim 10, wherein, The maximum number of cyclic shifts is based on the SRS sequence length.

12. The base station according to claim 11, wherein, When the length of the SRS sequence is an integer multiple of 6 instead of an integer multiple of 8 or 12, the maximum number of the plurality of UE ports is 2 ports.

13. The base station according to claim 11, wherein, When the length of the SRS sequence is a multiple of 8 but not a multiple of 12, the maximum number of the plurality of cyclic shifts is 8 cyclic shifts, and the maximum number of the plurality of UE ports is 4 ports.

14. The base station according to claim 11, wherein, When the length of the SRS sequence is an integer multiple of 12, the maximum number of the plurality of cyclic shifts is 12 cyclic shifts, and the maximum number of the plurality of UE ports is 4 ports.

15. The base station according to claim 10, wherein, The maximum number of UE ports is 6.

16. The base station according to claim 10, wherein, Mapping the six cyclic shifts to the multiple ports includes configuring each port. The phase ramp value of π, where i is the corresponding 1 cyclic shift in the 6 cyclic shifts.

17. The base station according to claim 10, wherein, The minimum subband size of the comb-shaped 8 SRS is 8 Physical Resource Blocks (PRBs).

18. The base station according to claim 10, wherein, The maximum number of ports is four, and the mapping includes configuring the following phase ramp value for each of the four ports: in It is the phase ramp of SRS port i. It is the maximum number of circular shifts. It is one of the six cyclic shifts configured, and It is the port index of SRS port i.

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