Sounding reference signal transmission during random access
By configuring SRS resource sets with different slot offsets and cyclic shift parameters, the UE can transmit SRS for DL CSI acquisition during random access, addressing latency issues and enhancing throughput in 5G NR TDD systems.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2025-03-17
- Publication Date
- 2026-06-11
AI Technical Summary
In wireless communication systems, there is a latency issue in acquiring downlink channel state information (CSI) during the initial access of a user equipment (UE) to a cell, leading to low throughput, especially in 5G NR TDD systems, due to the need for SRS transmission based on antenna switching, which is not supported for all UE capabilities during the random access procedure.
The UE is enabled to transmit SRS for DL CSI acquisition during the RRC connection establishment or reconfiguration by configuring SRS resource sets based on its capability, using different slot offsets and cyclic shift parameters to handle UE contention and support various UE capabilities, allowing early CSI acquisition during random access.
This approach enables efficient DL CSI acquisition during random access, improving UE throughput by reducing latency and supporting diverse UE capabilities through flexible SRS resource configurations and contention resolution mechanisms.
Smart Images

Figure CN2025082831_11062026_PF_FP_ABST
Abstract
Description
SOUNDING REFERENCE SIGNAL TRANSMISSION DURING RANDOM ACCESSTECHNICAL FIELD
[0001] The present document relates to wireless communication and, in particular, to a user device transmitting reference signal during random access.BACKGROUND
[0002] Mobile telecommunication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a more complex and sophisticated range of access requirements and flexibilities.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless system, known as 5G, advances the LTE and LTE-Awireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs.SUMMARY
[0004] Techniques described in the present document may be used for improvements to the transmission and reception of reference signals in wireless networks.
[0005] In one example aspect, a method of wireless communication is disclosed. The method includes receiving, by a wireless device from a network device, a reference signal (RS) resource configuration and a signaling; and transmitting, by the wireless device, an RS transmission according to the RS resource configuration, the signaling and a capability of the wireless device.
[0006] In another example aspect, a method of wireless communication is disclosed. The method includes transmitting, by a network device to a wireless device, a reference signal (RS) resource configuration; and receiving, by the network device from the wireless device, an RS transmission according to the RS resource configuration, a signaling and a capability of the wireless device.
[0007] In yet another example aspect, a device for wireless communication is disclosed. The device includes one or more processors configured to execute program code that causes the device to implement an above-described method.
[0008] In yet another aspect, a storage medium is disclosed. The storage medium is computer-readable and stores code that, upon execution, causes one or more processors to control operations of a device to implement an above-described method.
[0009] These, and other, aspects are further described throughout the present document.BRIEF DESCRIPTION OF DRAWINGS
[0010] FIG. 1 depicts a framework of reference signal transmission.
[0011] FIG. 2 shows an example of a wireless device having four antenna ports can have a capability to receive downlink transmissions from the network using four antenna ports and to transmit uplink transmissions to the network using two antenna ports.
[0012] FIG. 3 depicts an example timeline of operation of network triggering and reference signal transmission.
[0013] FIG. 4 depicts an example of multiple wireless devices transmitting SRS using different cyclic shift parameter values.
[0014] FIG. 5 shows an example of a wireless communication system.
[0015] FIG. 6 is a block diagram representation of a portion of a hardware platform in accordance with one or more embodiments of the present technology can be applied.
[0016] FIGS. 7A-7B are flowcharts for wireless communication method embodiments.DETAILED DESCRIPTION
[0017] Techniques described in the present document may be used for achieving improvements to use of reference signals in a wireless communication system.
[0018] Section headings are used in the present document only to improve readability and do not limit scope of the disclosed embodiments and techniques in each section to only that section. Furthermore, some embodiments are described with reference to Third Generation Partnership Project (3GPP) Fifth Generation (5G) New Radio (NR) or Sixth Generation (6G) standard for ease of understanding and the described technology may be implemented in different wireless system that implement protocols other than the NR or 6G protocol.
[0019] Initial discussion
[0020] The sounding reference signals (SRS) resources which can be transmitted by the UE for DL CSI acquisition is configured by the network depending on the UE capability of SRS antenna switching reported in a UE capability information message from the UE. UE can transmit the UE capability information message after it is in RRC_CONNECTED state or it accesses to a cell successfully. In this way, there is a large latency to a cell to acquire and apply DL CSI after the UE accesses to the cell, leading to low UE throughput at the beginning of the UE accessing to the cell or UE throughput degradation during cell switch.
[0021] By triggering SRS transmission during random access procedure, UE can transmit SRS to a cell to acquire DL channel state information (CSI) earlier than the UE accessing to the cell.
[0022] Background (may including prior arts)
[0023] Frequency Division Duplex (FDD) and Time Division Duplex (TDD) are supported in 5G NR systems. For FDD systems, different frequency spectrums are used for the uplink and downlink, allowing them to operate in parallel without interference. TDD systems uses the exact same frequency spectrum for both the uplink and downlink but allocates different time slots for their use.
[0024] In a 5G NR TDD system, each radio frame lasts 10 milliseconds and contains 10 subframes of 1 millisecond each. These subframes can contain a varying number of slots depending on the numerology (subcarrier spacing) . To accommodate diverse traffic patterns and application requirements, 3GPP has defined a lot of slot formats specifying how symbols within a slot can be configured as downlink (D) , uplink (U) , or flexible (F) symbols.
[0025] In TDD systems, the uplink transmits data for a short period, followed by the downlink, and this alternation continues seamlessly, creating the impression of continuous transmission. Therefore, it is assumed that the fading of the uplink channel is substantially the same as that of the downlink channel, i.e., channel reciprocity.
[0026] Channel state information (CSI) is critical to the network device for resource allocation optimization, interference reduction, link adaption, beamforming and system performance enhancement. For channel state information (CSI) acquisition, UE can transmit CSI reports to the network based on reception and measurement of CSI reference signals (CSI-RS) or network acquires the CSI based on sounding reference signal (SRS) transmissions from the UE. In TDD systems, SRS based CSI acquisition is normally applied.
[0027] Depending on the diversity of UEs, the number of antenna ports for uplink transmission can be same as or less than that for downlink reception. UE needs to transmit SRS based on antenna switching for DL CSI acquisition at network side. Accordingly, the UE has a capability of supporting SRS transmission based on antenna port switching, wherein the capability indicates that the SRS transmission is on a first number of (e.g., x) antenna ports over a total number (e.g., y) of antennas, where y corresponds to all or subset of UE receive antennas.
[0028] FIG. 2 shows an example of a wireless device having four antenna ports can have a capability to receive downlink transmissions from the network using four antenna ports and to transmit uplink transmissions to the network using two antenna ports. For DL CSI acquisition based on SRS transmission, UE should transmit one or more SRS transmissions using the antenna ports which used for DL reception based on SRS antenna switching. In this example, UE transmit a first SRS using antenna ports #1 and #2, and it transmits a second SRS using antenna ports #0 and #3.
[0029] Overview of Embodiments
[0030] In this patent document, an uplink reference signal comprises an SRS or a reference signal for CSI acquisition. In this patent document, DL CSI acquisition is performed during RRC connection establishment or RRC connection reconfiguration. In this patent document, a cell comprises a serving cell, a virtual cell, a cell portion, a physical cell, a candidate cell, a neighbor cell or a carrier component. In this patent document, random access radio network temporary identifier (RA-RNTI) , temporary cell radio network temporary identifier (TC-RNTI) , random access response (RAR) , Msg4 for the reception of a UE are associated with a random access procedure performed by the UE. This patent document discloses techniques and embodiments of UE transmitting SRS for DL CSI acquisition during RRC connection establishment or RRC connection reconfiguration. In some embodiments, UE supports an SRS antenna switching functionality associated with a UE capability value.
[0031] The UE capability value associated with the SRS antenna switching functionality comprises 1T1R, 1T2R, 1T4R, 1T6R, 1T8R, 2T2R, 2T4R, 2T6R, 2T8R, 4T4R, 4T8R or 8T8R. Herein, the notation “T” and “R” refer to transmit and receive antennas, respectively.
[0032] In some embodiments, SRS transmission for DL CSI acquisition is not enabled or supported for a number of UE capability values out of the capability values above according to a configuration or a signaling. The UE capability values mentioned below does not include the number of UE capability values.
[0033] In some embodiments, UE determines one or more sets of UE capability values based on a rule or a signaling that UE capability values indicating the same number of antenna ports for uplink reference signal transmission are associated with a same set of UE capability value.
[0034] In an example, UE capability values of 1T1T, 1T2R, 1T4R, 1T6R and 1T8R are in a first set, UE capability values of 2T2R, 2T4R, 2T6R, 2T8R are in a second set, capability values of 4T4R, 4T8R are in a third set, capability value of 8T8R is in a fourth set.
[0035] Example embodiments 1:
[0036] This section discloses, among other things, embodiments of SRS resource configuration for DL CSI acquisition.
[0037] FIG. 1 shows a framework of UE transmitting SRS during random access. Where, UE receives an SRS resource configuration for DL CSI acquisition. The SRS resource configuration configures a plurality of SRS resources sets, where each SRS resource set is associated with one or more UE capability values. And the UE transmits SRS in response to receiving an SRS triggering signaling (e.g., physical downlink control channel PDCCH or physical downlink shared channel PDSCH) based on search space, RNTI, monitoring occasion and / or indication field associated with the STS triggering signaling. Then, the UE transmits SRS by applying a cyclic shift value based on a cyclic shift parameter configured for the corresponding SRS resource.
[0038] In some embodiments, UE receives an SRS resource configuration for DL CSI acquisition. The SRS resource configuration is provided in a system information message (e.g., SIB1 message) or in a RRC reconfiguration message.
[0039] (1) The SRS resource configuration configures at least one of following SRS resources sets:
[0040] -A first SRS resource set indicating a first number of SRS resources, each of which is associated with a single SRS port. To support different UE capability values, the first number is predetermined or configured to be 1, 2, 4, 6 or 8.
[0041] -A second SRS resource set indicating a second number of SRS resources, each of which is associated with two SRS ports. To support different UE capability values, the second number is predetermined or configured to be 1, 2, 3 or 4.
[0042] -A third SRS resource set indicating a third number of SRS resources, each of which is associated with four SRS ports. To support different UE capability values, the third number is predetermined or configured to be 1 or 2;
[0043] -Else, a fourth SRS resource set indicating one SRS resource associated with eight SRS ports.
[0044] In some embodiments, the four SRS resource sets are associated with the four UE capability value set respectively.
[0045] In some embodiments, UE transmits partial or all SRS resources indicated in an SRS resource set depending on its capability.
[0046] The UE capability indicates that an SRS transmission is on a first number of (e.g., x) antenna ports over a total number (e.g., y) of antennas, where y corresponds to all or subset of UE receive antennas. The number of SRS resources which are transmitted by the UE can be determined based on y divided by x (i.e., y / x) , and the transmitted SRS resources are from the SRS resource set which indicates SRS resources associated with x SRS ports.
[0047] Based on the methods as in the above embodiments, , the configuration is flexible to support DL CSI acquisition during random access for all or partial UE capabilities.
[0048] Example#1: If the fourth SRS resource set is not configured, a UE only supporting UE capability value of 8T8R cannot transmit SRS for DL CSI acquisition during random access.
[0049] Example#2: If 6 SRS resources is configured in the first SRS resource set, a UE only supporting UE capability value of 1T8R cannot transmit SRS for DL CSI acquisition during random access, and a UE supporting UE capability value of 1T1R, 1T2R, 1T4R or 1T6R can transmit SRS for DL CSI acquisition during random access.
[0050] Example#3: If the fourth SRS resource set is not configured, a UE supporting UE capability value of 8T8R and 4T8R can transmit SRS for DL CSI acquisition during random access based on the third SRS resource set.
[0051] Example#4: If 8 SRS resources is configured in the first SRS resource set, a UE supporting UE capability value of 1T8R can transmit SRS associated with one of the SRS resources in the first SRS resource set, a UE supporting UE capability value of 1T2R can transmit SRS associated with two of the SRS resources in the first SRS resource set, and so on.
[0052] (2) The SRS resource configuration configures a plurality of SRS resources sets, where each SRS resource set is associated with a UE capability value.
[0053] The plurality of SRS resources sets are associated with all or partial UE capability values comprising 1T1R, 2T2R, 4T4R, 8T8R, 1T2R, 1T4R, 1T6R, 1T8R, 2T4R, 2T6R, 2T8R or 4T8R.
[0054] In an example, if the SRS resource set associated with a UE capability value (e.g., with value of 4T8R) is not configured, a UE only supporting the UE capability value cannot transmit SRS for DL CSI acquisition during random access.
[0055] In an example, if the SRS resource set associated with a UE capability (e.g., with value of 4T8R) is not configured, a UE supporting a second UE capability besides the UE capability can transmit SRS for DL CSI acquisition during random access based on the SRS resource set associated with the second UE capability.
[0056] In some embodiments, SRS resources in the SRS resource sets configured by the SRS resource configuration are configured to be transmitted within the initial UL BWP configured to the UE.
[0057] In some embodiments, a UE receives the SRS resource configuration is equivalent to UE is configured / enabled the operation of SRS transmission for DL CSI acquisition during RRC connection establishment or RRC connection reconfiguration.
[0058] In some embodiments, a UE is enabled the operation of SRS transmission for DL CSI acquisition during RRC connection establishment or RRC connection reconfiguration based on a network signaling enabling the operation. The network signaling enabling the operation at least when the SRS resource configuration is provided to the UE.
[0059] In some embodiments, an SRS resource set is configured with a slot offset value which is used to determine the time interval between an SRS transmission of an SRS resource in the SRS resource set and a network message triggering the SRS transmission. The slot offset value configured for different SRS resource sets is different.
[0060] In this method, when UEs with different UE capabilities (e.g., different number of antenna ports for SRS transmission) receives a same network triggering SRS transmission, the UEs can transmit corresponding SRS resources in different slots based on the different slot offset values.
[0061] FIG. 3 depicts an example timeline of operation of network triggering and reference signal transmission. Some network events are depicted with the horizontal axis representing time. As depicted in the leftmost event box 102, UE#1 and UE#2 receive a same network message for SRS transmission triggering. However, the triggered SRS for the two UEs are different due to their supportive UE capabilities, and they transmit SRS in different slots based on different slot offset values configured for the different SRS resource sets. For example, UE#1 may transmit (event box 104) at a first slot offset value (e.g., this UE supports capability value 1T2R) and UE#2 may transmit (event box 106) at a second slot offset value that is different from the first slot offset value (e.g., this UE supports 2T4R capability) . Furthermore, the two UEs may use two different SRS resource sets for their respective transmissions.
[0062] In some embodiments, a UE supports more than one UE capability values, UE transmits an SRS associated with an SRS resource set associated with one of the more than one UE capability values, where the one of the more than one UE capability values is determined based on at least one of the following:
[0063] (1) the highest / lowest UE capability, where UE capability values are in ascending order as 1T1R, 1T2R, 1T4R, 1T6R, 1T8R, 2T2R, 2T4R, 2T6R, 2T8R, 4T4R, 4T8R, 8T8R, or
[0064] (2) UE implementation.
[0065] Example Embodiments 2
[0066] This section discloses, among other things, embodiments of SRS sequence determination for an SRS resource.
[0067] In scenarios of contention based random access, multiple UEs can receive and respond to a same network signaling triggering SRS transmission. In this way, multiple UEs can transmit SRS corresponding to a same SRS resource in the same time and frequency domain, and the following embodiments based on SRS sequence determination can be used to handle the UE contention issues.
[0068] In some embodiments, UE determines a cyclic shift value for an antenna port of an SRS resource based on a cyclic shift parameter configured for the SRS resource. The cyclic shift parameter indicates a value (i.e., a positive integer value) for cyclic shift determination.
[0069] UE determines the cyclic shift value based on a quantity ranging
[0070] (1) from 0 to the positive integer value
[0071] (2) from 0 to the positive integer value minus 1
[0072] or (3) from 1 to the positive integer value.
[0073] In an example, the cyclic shift parameter indicates a value of 5, UE determines a value of 0, 1, 2, 3, 4 or 5 to determine cyclic shift value for the SRS transmission.
[0074] In some embodiments, UE determines cyclic shift values for all the antenna ports of the SRS resource based on a same quantity determined based on the cyclic shift parameter.
[0075] In an example, the cyclic shift αi for antenna port pi is given as where, represents the maximum number of cyclic shifts of the SRS resource. If the higher-layer parameter hoppingFinerGranularity is configured, K=2, otherwise K=1. The quantity is determined based on the configuration of cyclic shift hopping for the SRS resource. The quantity is determined based on the antenna port and the number of antenna ports configured for the SRS resource.
[0076] And where, quantity of Qcsp is determined based on the cyclic shift parameter.
[0077] In some embodiments, UE determines sequence group and / or sequence number of an SRS resource based on a sequence identity information configured for the SRS resource.
[0078] (1) The sequence identify information indicates a plurality of sequence identify values.
[0079] UE determines the sequence group and / or sequence number of the SRS resource based on one of the plurality of sequence identity values.
[0080] (2) Or the sequence identity information indicates a sequence identity value and one or more delta values.
[0081] UE determines the sequence group and / or sequence number of the SRS resource based on the sequence identity and one of the one or more delta values. For instance, UE determines a sequence identity value based on a sum of the sequence identity and the one of the one or more delta values.
[0082] In an example, if neither group hopping nor sequence hopping is configured for the SRS resource, UE determines that the sequence group where and
[0083] corresponds to the one of the plurality of sequence identity values or sum of the sequence identity value and the one of the delta values.
[0084] In an example, if sequence hopping is configured for the SRS resource, UE determines that the sequence number
[0085] where the pseudo-random sequence c (i) is initialized with based on at the beginning of each radio frame, corresponds to the one of the plurality of sequence identity values or sum of the sequence identity value and the one of the delta values.
[0086] In an example, if group hopping is configured for the SRS resource, UE determines that the sequence group where
[0087] where the pseudo-random sequence c (i) is defined by clause 5.2.1 and shall be initialized with at the beginning of each radio frame, corresponds to the one of the plurality of sequence identity values or sum of the sequence identity value and the one of the delta values.
[0088] The one of the plurality of sequence identity values or the one of the delta values is determined by the UE implementation.
[0089] In an example, UE randomly selects one sequence identity value from the plurality of sequence identity values.
[0090] Or the one of the plurality of sequence identify values or the one of the delta values is determined based on a UE identity information transmitted by the UE in a PUSCH scheduled by a RAR UL grant. Values of the UE identity information are associated with the plurality of sequence identify values or the one or more delta values.
[0091] In an example, values of the UE identity information are divided into a first number of groups, where the first number equal to the total number of the plurality of sequence identify values. Each group of UE identity information values are associated with a corresponding sequence identity value or a corresponding delta value.
[0092] FIG. 4 shows an example of multiple UEs transmitting SRS using different cyclic shift parameter values. UEs supporting a same capability (1T2R in this example) can receive a same network message triggering SRS transmission, and the UEs transmits SRSs associated with the same SRS resource set in a same slot due to having same capability. SRS transmissions from different UEs can use different sequence identity or cyclic shift value as embodied in this patent document to be identified by the network.
[0093] In some embodiments, in response to UE transmitting an SRS based on SRS sequence determination as in the above embodiments, UE transmits information of SRS sequence of the SRS transmission in a PUSCH scheduled by a RAR UL grant or a PDCCH scrambled with TC-RNTI. The information comprises value / identification of value for cyclic shift determination of the SRS, the sequence identity value for the SRS or the delta value for the SRS.
[0094] In an example, if the cyclic shift parameter indicates a value of 5, the candidate values of 0, 1, 2, 3, 4 or 5 can be used. UE determines a value of 2 to determine cyclic shift value for its SRS transmission and transmits an information indicating that the value of 2 is used by the UE. The information can explicitly indicate the value or implicitly indicate a codepoint associated with the value.
[0095] Conclusion
[0096] The disclosed methods define techniques and methods of UE transmitting SRS for DL CSI acquisition in response to UE receives a network message associated with a random access procedure towards a cell. More specifically, defining UE receives a sounding reference signal resource configuration associated with UE capability value of SRS antenna switching functionality; and defining UE determining SRS sequence of the SRS transmission in response to the triggering signaling in case of UE contention based SRS transmission.
[0097] Implementation Examples
[0098] FIG. 5 shows an example of a wireless communication system 1300 where techniques in accordance with one or more embodiments of the present technology can be applied. A wireless communication system 1300 can include one or more network devices such as base stations (BSs) 1305a, 1305b, one or more wireless devices (or UEs) 1310a, 1310b, 1310c, 1310d, and a core network 1325. A base station 1305a, 1305b can provide wireless service to terminal devices 1310a, 1310b, 1310c and 1310d in one or more wireless sectors. In some implementations, a base station 1305a, 1305b includes directional antennas to produce two or more directional beams to provide wireless coverage in different sectors. The core network 1325 can communicate with one or more base stations 1305a, 1305b. The core network 1325 provides connectivity with other wireless communication systems and wired communication systems. The core network may include one or more service subscription databases to store information related to the subscribed terminal devices 1310a, 1310b, 1310c, and 1310d. A first base station 1305a can provide wireless service based on a first radio access technology, whereas a second base station 1305b can provide wireless service based on a second radio access technology. The base stations 1305a and 1305b may be co-located or may be separately installed in the field according to the deployment scenario. The terminal devices 1310a, 1310b, 1310c, and 1310d can support multiple different radio access technologies. The techniques and embodiments described in the present document may be implemented by the base stations of wireless devices described in the present document.
[0099] FIG. 6 is a block diagram representation of a portion of a hardware platform in accordance with one or more embodiments of the present technology can be applied. The hardware platform 1405 may implement functionalities of a device or an apparatus such as a BS (anetwork device) or a wireless device (e.g., a UE) can include processor electronics 1410 such as one or more microprocessors, processors, system on chip (SOC) or the like that implements one or more of the wireless communication techniques presented in this document. The hardware platform 1405 can include transceiver electronics 1415 to send and / or receive messages and signals over one or more communication interfaces such as antenna 1420. In some embodiments, the communication interface may be a wired interface, in which case the antenna 1420 may not be needed / used. The hardware platform 1405 can include other communication interfaces for transmitting and receiving data (e.g., data transmissions among entities in a core network) . The hardware platform 1405 can include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some implementations, the processor electronics 1410 can include at least a portion of the transceiver electronics 1415. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the hardware platform 1405. In some embodiments, the hardware platform 1405 may be configured to perform the methods described herein. For example, the processor electronics 1410 may control the transceiver electronics 1415 to transmit or receive signals and thereby control the hardware platform to perform methods described herein.
[0100] Example technical solutions
[0101] Some preferred embodiments may implement the following solutions.
[0102] 1. A method of wireless communication (e.g., method 710 depicted in FIG. 7A) , comprising: receiving (712) , by a wireless device from a network device, a reference signal (RS) resource configuration and a signaling; and transmitting (714) , by the wireless device, an RS transmission according to the RS resource configuration, the signaling and a capability of the wireless device.
[0103] 2. A method of wireless communication (e.g., method 720 depicted in FIG. 7B) , comprising: transmitting (722) , by a network device to a wireless device, a reference signal (RS) resource configuration and a signaling; and receiving (724) , by the network device from the wireless device, an RS transmission according to the RS resource configuration, the signaling and a capability of the wireless device.
[0104] 3. The method of solutions 1-2, wherein the RS resource configuration indicates one or more of: a first resource set that indicates a first number of RS resources, each associated with a single RS port; a second resource set that indicates a second number of RS resources, each associated with two RS ports; a third resource set that indicates a third number of RS resources, each associated with four RS ports; or a fourth resource set that indicates a fourth number of RS resources, each associated with eight RS ports.
[0105] 4. The method of solution 3, wherein the first number of RS resources, the second number of RS resources, the third number of RS resources and / or the fourth number of RS resources are pre-determined.
[0106] 5. The method of solution 3, wherein the first number of RS resources, the second number of RS resources, the third number of RS resources and / or the fourth number of RS resources are configured by the network device.
[0107] 6. The method of solutions 3-5, wherein the RS resource configuration indicates a capability value set associated with each of first to fourth resource sets.
[0108] 7. The method of solutions 1-2, wherein the RS resource configuration indicates a plurality of RS resource sets, each associated with a corresponding capability value.
[0109] 8. The method of solutions 1-7, wherein the RS resource configuration indicates different slot offset values for different RS resource sets, where a slot offset value is used for the RS transmission.
[0110] 9. The method of solutions 1-7, wherein the RS resource configuration indicates a cyclic shift parameter for an RS transmission corresponding to an RS resource in the RS resource sets.
[0111] 10. The method of solution 9, wherein the cyclic shift parameter indicates that the RS transmission uses one cyclic shift value out of a plurality of cyclic shift values determined based on the cyclic shift parameter.
[0112] 11. The method of solution 1-10, wherein the cyclic shift values for the antenna ports of the reference signal resource are the same.
[0113] 12. The method of solutions 1-7, wherein the RS resource configuration indicates a sequence identity information for the RS transmission corresponding to an RS resource in the RS resource sets.
[0114] 13. The method of solution 12, wherein the sequence identify information indicates a plurality of sequence identify values or the sequence identity information indicates a sequence identity value and one or more delta values.
[0115] 14. The method of solutions 1-2, wherein the signaling indicates to trigger reference signal transmission associated with the capability of the user device.
[0116] 15. The method of solution 1-2, wherein the signaling indicates an available slot offset value from one or more available slot offset values configured for an RS resource set associated with the capability of the wireless device.
[0117] 16. The method of solution 1-2, wherein the capability of the wireless device is one of one or more capabilities of the wireless device determined based on ordering of the one or more capabilities.
[0118] 17. The method of solutions 1 to 16, UE transmits information of RS sequence of the RS transmission in a PUSCH scheduled by a RAR UL grant or a PDCCH scrambled with TC-RNTI.
[0119] 18. The method of solution 17, wherein the information indicates a cyclic shift value, a sequence identify value, or a delta value for the RS transmission.
[0120] 19. The method of any of above solutions, wherein the RS comprises a sounding reference signal (SRS) .
[0121] 20. An apparatus for wireless communications, comprising: at least one processor; and a transceiver couple to the at least one processor; wherein the processor is configured to control transmitting and / or receiving by the transceiver such that the apparatus implements a method recited in any one or more of above solutions.
[0122] 21. A computer-readable medium having code stored thereon, the code, upon execution by at least one processor of an apparatus, causing the apparatus to implement method recited in any one or more of above solutions.
[0123] The disclosed and other embodiments, modules and the functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations of one or more of them. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus. The computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more of them. The term “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers. The apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. A propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, which is generated to encode information for transmission to suitable receiver apparatus.
[0124] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document) , in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code) . A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
[0125] The processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) . Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random-access memory or both. The essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks. However, a computer need not have such devices. Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
[0126] While this patent document contains many specifics, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. Certain features that are described in this patent document 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. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
[0127] Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Moreover, the separation of various system components in the embodiments described in this patent document should not be understood as requiring such separation in all embodiments.
[0128] Only a few implementations and embodiments are described, and other implementations, enhancements and variations can be made based on what is described and illustrated in this patent document.
Claims
1.A method of wireless communication, comprising:receiving, by a wireless device from a network device, a reference signal (RS) resource configuration and a signaling; andtransmitting, by the wireless device, an RS transmission according to the RS resource configuration, the signaling and a capability of the wireless device.2.A method of wireless communication, comprising:transmitting, by a network device to a wireless device, a reference signal (RS) resource configuration and a signaling; andreceiving, by the network device from the wireless device, an RS transmission according to the RS resource configuration, the signaling and a capability of the wireless device.3.The method of claims 1-2, wherein the RS resource configuration indicates one or more of:a first resource set that indicates a first number of RS resources, each associated with a single RS port;a second resource set that indicates a second number of RS resources, each associated with two RS ports;a third resource set that indicates a third number of RS resources, each associated with four RS ports; ora fourth resource set that indicates a fourth number of RS resources, each associated with eight RS ports.4.The method of claim 3, wherein the first number of RS resources, the second number of RS resources, the third number of RS resources and / or the fourth number of RS resources are pre-determined.5.The method of claim 3, wherein the first number of RS resources, the second number of RS resources, the third number of RS resources and / or the fourth number of RS resources are configured by the network device.6.The method of claims 3-5, wherein the RS resource configuration indicates a capability value set associated with each of first to fourth resource sets.7.The method of claims 1-2, wherein the RS resource configuration indicates a plurality of RS resource sets, each associated with a corresponding capability value.8.The method of claims 1-7, wherein the RS resource configuration indicates different slot offset values for different RS resource sets, where a slot offset value is used for the RS transmission.9.The method of claims 1-7, wherein the RS resource configuration indicates a cyclic shift parameter for an RS transmission corresponding to an RS resource in the RS resource sets.10.The method of claim 9, wherein the cyclic shift parameter indicates that the RS transmission uses one cyclic shift value out of a plurality of cyclic shift values determined based on the cyclic shift parameter.11.The method of claim 1-10, wherein the cyclic shift values for the antenna ports of the reference signal resource are the same.12.The method of claims 1-7, wherein the RS resource configuration indicates a sequence identity information for the RS transmission corresponding to an RS resource in the RS resource sets.13.The method of claim 12, wherein the sequence identify information indicates a plurality of sequence identify values or the sequence identity information indicates a sequence identity value and one or more delta values.14.The method of claims 1-2, wherein the signaling indicates to trigger reference signal transmission associated with the capability of the user device.15.The method of claim 1-2, wherein the signaling indicates an available slot offset value from one or more available slot offset values configured for an RS resource set associated with the capability of the wireless device.16.The method of claim 1-2, wherein the capability of the wireless device is one of one or more capabilities of the wireless device determined based on ordering of the one or more capabilities.17.The method of claims 1 to 16, UE transmits information of RS sequence of the RS transmission in a PUSCH scheduled by a RAR UL grant or a PDCCH scrambled with TC-RNTI.18.The method of claim 17, wherein the information indicates a cyclic shift value, a sequence identify value, or a delta value for the RS transmission.19.The method of any of above claims, wherein the RS comprises a sounding reference signal (SRS) .20.An apparatus for wireless communications, comprising:at least one processor; anda transceiver couple to the at least one processor;wherein the processor is configured to control transmitting and / or receiving by the transceiver such that the apparatus implements a method recited in any one or more of above claims.21.A computer-readable medium having code stored thereon, the code, upon execution by at least one processor of an apparatus, causing the apparatus to implement method recited in any one or more of above claims.