WO2021258400A1 - Mise en correspondance de port avec antenne pour communications de liaison montante - Google Patents

Mise en correspondance de port avec antenne pour communications de liaison montante Download PDF

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Publication number
WO2021258400A1
WO2021258400A1 PCT/CN2020/098341 CN2020098341W WO2021258400A1 WO 2021258400 A1 WO2021258400 A1 WO 2021258400A1 CN 2020098341 W CN2020098341 W CN 2020098341W WO 2021258400 A1 WO2021258400 A1 WO 2021258400A1
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WO
WIPO (PCT)
Prior art keywords
reference signal
respective antenna
mapping
antennas
ports
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Application number
PCT/CN2020/098341
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English (en)
Inventor
Zhanzhong YUAN
Haojun WANG
Jinglin Zhang
Yuanqiang Cai
Zhenqing CUI
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/098341 priority Critical patent/WO2021258400A1/fr
Publication of WO2021258400A1 publication Critical patent/WO2021258400A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the following relates generally to wireless communications and more specifically to port to antenna mapping for uplink communications.
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • a wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • Devices in wireless communications systems may support the mapping of uplink signals or ports to antennas supported by the UE.
  • a UE may be configured to map an uplink signal to a number of antennas used transmit the uplink signal to a base station.
  • some of the transmitter antennas used for the mapping may experience poor channel quality, which may lead to transmission loss or poor reception quality of the uplink signal.
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support port to antenna mapping for uplink communications.
  • the described techniques provide for efficient mapping techniques of uplink signaling to antennas or antenna ports of a wireless device.
  • a user equipment UE may be configured to transmit an uplink message using the one or more reference signal ports.
  • the UE may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the UE may receive a configuration message from a base station which may indicate the duration for the timer, initiation of the timer, stopping of the timer, or any combination thereof.
  • the UE may receive a downlink control message from the base station which may indicate a usage type of a reference signal associated with the one or more reference signal ports.
  • the usage type may indicate one of a codebook based scheme or a non-codebook based scheme for the reference signal.
  • the UE may also receive synchronization signal blocks (SSBs) from the base station and may perform synchronization signal measurements for each of the antennas of the UE.
  • the synchronization signal measurements may indicate channel quality information for each of the antennas.
  • the timer may expire or stop, and the UE may map at least one of the reference signal ports to the one or more antennas based on the synchronization signal measurements and the indicated usage type.
  • the usage type indicating a non-codebook based scheme may enable the UE to map a reference signal port to the antenna with a highest measurement of the respective synchronization signal measurements or an antenna having a measurement that exceeds a measurement threshold.
  • the usage type indicating a codebook based scheme may enable the UE to map one or more reference signal ports to the antennas with the measurements that exceed a measurement threshold based on determining the number of reference signal ports for the reference signal indicated by the downlink control message.
  • the UE may transmit the one or more uplink signals based on the mapping.
  • a method of wireless communications at a UE may include initiating a timer for mapping one or more reference signal ports to one or more antennas of the UE, receiving a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme, performing respective synchronization signal measurements for each of the one or more antennas of the UE, and mapping, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE, receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme, perform respective synchronization signal measurements for each of the one or more antennas of the UE, and map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the apparatus may include means for initiating a timer for mapping one or more reference signal ports to one or more antennas of the UE, receiving a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme, performing respective synchronization signal measurements for each of the one or more antennas of the UE, and mapping, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • a non-transitory computer-readable medium storing code for wireless communications at a UE is described.
  • the code may include instructions executable by a processor to initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE, receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme, perform respective synchronization signal measurements for each of the one or more antennas of the UE, and map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the mapping may include operations, features, means, or instructions for mapping the reference signal port to the respective antenna based on the usage type indicating the non-codebook based scheme, where a synchronization signal measurement for the respective antenna exceeds a measurement threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting an uplink message using the respective antenna based on the mapping.
  • the reference signal port may be associated with an index value of 0.
  • the mapping may include operations, features, means, or instructions for mapping the reference signal port to the respective antenna based on the usage type indicating the codebook based scheme.
  • the mapping may include operations, features, means, or instructions for mapping the reference signal port to the respective antenna based on determining that a number of reference signal ports for the reference signal indicated by the downlink control message equals one.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the respective antenna based on the respective synchronization signal measurements, where a synchronization signal measurement for the respective antenna exceeds the measurement threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for mapping a second reference signal port of the one or more reference signal ports to a second respective antenna based on determining that a number of reference signal ports for the reference signal indicated by the downlink control message equals two.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the second respective antenna based on the respective synchronization signal measurements, where a synchronization signal measurement for the second respective antenna exceeds the measurement threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for mapping, based on determining that a number of reference signal ports for the reference signal indicated by the downlink control message equals four, a second reference signal port of the one or more reference signal ports to a second respective antenna, and a third reference signal port of the one or more reference signal ports to a third respective antenna.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the third respective antenna based on the respective synchronization signal measurements, where a synchronization signal measurement for the third respective antenna exceeds the measurement threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for randomly mapping remaining reference signal ports of the one or more reference signal ports to the one or more antennas of the UE excluding the respective antenna.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for restarting the timer based on the mapping.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a configuration message from a base station, the configuration message indicating a duration for the timer, an initiation of the timer, a stopping of the timer, or any combination thereof.
  • receiving the downlink control message may include operations, features, means, or instructions for receiving an indication of the usage type in one of a downlink control information message or a radio resource control message.
  • FIG. 1 illustrates an example of a wireless communications system that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates an example of a wireless communications system that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a process timeline that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIG. 4 illustrates an example of a process flow that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIGs. 5 and 6 show block diagrams of devices that support port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIG. 7 shows a block diagram of a communications manager that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIG. 8 shows a diagram of a system including a device that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • FIGs. 9 through 13 show flowcharts illustrating methods that support port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • a wireless communications system may support reference signal port mapping.
  • a user equipment may be configured (e.g., preconfigured or by a serving base station) to utilize one or more transmitting antennas and one or more receiving antennas for wireless communications.
  • a UE may be configured for transmitting over two antennas and receiving over four antennas (e.g., 2T4R antenna capability) , which may enable the UE to utilize two antennas for transmission when four antennas may be configured for reception.
  • the UE may be configured to map one or more reference signal ports, such as sounding reference signal (SRS) ports, to the antennas of the UE.
  • a port may refer to a logical entity that may be distinct from (but may map to) a physical antenna.
  • the UE may then transmit a reference signal over one or more of the mapped transmitting antennas based on the mapping of reference signal ports.
  • a UE configured with a 2T4R antenna capability may also be configured to map reference signal ports to two antennas of the four antennas of the UE (e.g., a first reference signal port mapped to a first antenna, a second reference signal port mapped to second antenna) for transmission of the reference signal.
  • at least one or more of the mapped transmitting antennas may experience poor channel quality compared to other antennas that were not mapped or were left unmapped for transmitting. However, due to the configured reference signal port mapping, the UE may still transmit over the mapped antennas with poor channel quality, which may lead to transmission loss and interference in the transmitted signal.
  • a UE may initiate a timer for indicating a mapping or remapping of one or more reference signal ports to one or more antennas of the UE.
  • the UE may map the one or more reference signal ports to the one or more antennas of the UE after the expiration (or stoppage) of the timer.
  • the timer may be restarted after mapping the one or more reference signal ports to the one or more antennas of the UE.
  • the UE may receive a configuration message from a base station which may indicate the duration for the timer, initiation of the timer, stopping of the timer, or any combination thereof.
  • the UE may receive a downlink control message from a base station which may configure the UE for reference signal port mapping.
  • the downlink control message may indicate a usage type of a reference signal associated with the one or more reference signal ports.
  • the UE may receive the indication of the usage type in a downlink control information (DCI) message or a radio resource control (RRC) message.
  • the usage type may indicate either a codebook based scheme or a non-codebook based scheme for reference signal port mapping.
  • the downlink control message may configure an antenna capability configuration of the UE.
  • the base station may determine the antenna capability configuration of the UE based on an antenna capability message transmitted by the UE to the base station.
  • the antenna capability message may indicate each antenna capability configuration the UE may support (e.g., 1T2R, 2T4R, 1T4R, etc. )
  • the UE may receive synchronization signal blocks (SSBs) from the base station to perform synchronization signal measurements for each of the antennas of the UE during the timer.
  • SSBs synchronization signal blocks
  • a UE configured with a 2T4R antenna capability may perform channel quality measurements for each antenna (e.g., a first antenna, a second antenna, a third antenna, a fourth antenna) of the UE.
  • a synchronization signal measurement for an antenna may include a signal-to-noise ratio (SNR) measurement, channel quality measurement, reference signal received power (RSRP) , or other measurement on the antenna.
  • the SSBs may be broadcast to a group of UEs including the UE or in a control message (e.g., the downlink control message) .
  • the UE may begin mapping one or more reference signal ports to one or more antennas after the expiration of the timer.
  • the UE may map the one or more reference signal ports to one or more antennas based on the usage type of the reference signal and the synchronization signal measurements for each of the antennas. For instance, a UE with a usage type indicating a non-codebook based scheme may map a reference signal port to the antenna having a synchronization signal measurement that exceeds a measurement threshold.
  • a UE configured with a non-codebook based scheme may map a first reference signal port, transmitting a reference signal, to a first antenna, where the first antenna may be associated with a highest measurement of the synchronization signal measurements measured over each antenna of the UE.
  • a UE with a usage type indicating a codebook based scheme may map one or more reference signal ports to the antennas with the measurements that exceed a measurement threshold (or the highest measurements of synchronization signal measurements) based on determining the number of reference signal ports for the reference signal indicated by the downlink control message.
  • the number of reference signal ports for the reference signal indicated by the downlink control message may be equal to one, two, or four ports.
  • a UE a codebook based scheme may determine a number of reference signal ports for the reference signal equal to one, which may be indicated by the downlink control message. The UE may then map a first reference signal port, transmitting the reference signal, to a first antenna, where the first antenna may be associated with the highest measurement of the synchronization signal measurements over each antenna of the UE.
  • a UE configured in a codebook based scheme may determine a number of reference signal ports for the reference signal equal to two, which may be indicated by the downlink control message. The UE may then map a first reference signal port and a second reference signal port, each transmitting the reference signal, to a first antenna and a second antenna respectively (e.g., the first reference signal port mapped to the first antenna, the second reference signal port mapped to the second antenna) , where the first antenna and the second antenna may be associated with the two highest measurements of the synchronization signal measurements over each antenna of the UE.
  • a UE configured in a codebook based scheme may determine a number of reference signal ports for the reference signal equal to four, which may be indicated by the downlink control message. The UE may then map a first reference signal port, a second reference signal port, a third reference signal port, and a fourth reference signal port, each transmitting the reference signal, to a first antenna, a second antenna, a third antenna, and a fourth antenna respectively (e.g., the first reference signal port mapped to the first antenna, the second reference signal port mapped to the second antenna, etc. ) , where the first, second, third, and fourth antennas may be associated with the four highest measurements of the synchronization signal measurements over each antenna of the UE.
  • reference signal port mapping techniques similar to those described herein may be implemented for reference signal port mapping of a UE configured a number of transmitting reference signal ports greater than four and the UE has a number of antennas greater than four.
  • the UE may enable a physical uplink shared channel (PUSCH) transmission to transmit over the mapped reference signal ports, and the PUSCH transmission may include an uplink message.
  • the uplink message may include data signals, control signals, reference signals, or a combination thereof.
  • the UE may randomly map other ports to one or more remaining antennas not respectively mapped to the reference signal. For instance, the UE may randomly map another reference signal port, an uplink data signal port, or a control signal port to an antenna not mapped for the original reference signal. In some cases, the UE may map a port to each antenna until each antenna may be mapped to a port.
  • aspects of the disclosure are illustrated with respect to wireless communications systems. Aspects are also described with reference to a process timeline and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, process timelines, and flowcharts that relate to port to antenna mapping for uplink communications.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • NR New Radio
  • the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.
  • ultra-reliable e.g., mission critical
  • the base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities.
  • the base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125.
  • Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125.
  • the coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.
  • the UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times.
  • the UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1.
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.
  • network equipment e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment
  • the base stations 105 may communicate with the core network 130, or with one another, or both.
  • the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) .
  • the base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both.
  • the backhaul links 120 may be or include one or more wireless links.
  • One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.
  • a base transceiver station a radio base station
  • an access point a radio transceiver
  • a NodeB an eNodeB (eNB)
  • eNB eNodeB
  • a next-generation NodeB or a giga-NodeB either of which may be referred to as a gNB
  • gNB giga-NodeB
  • a UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples.
  • a UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC machine type communications
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • devices such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • the UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers.
  • the term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125.
  • a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • BWP bandwidth part
  • Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling.
  • the wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • a carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • a carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .
  • the communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115.
  • Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
  • the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) .
  • Devices of the wireless communications system 100 e.g., the base stations 105, the UEs 115, or both
  • the wireless communications system 100 may include base stations 105 or UEs 115 that support simultaneous communications via carriers associated with multiple carrier bandwidths.
  • each served UE 115 may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • a resource element may include of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) .
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.
  • Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) .
  • Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
  • SFN system frame number
  • Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration.
  • a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots.
  • each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing.
  • Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
  • a subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) .
  • TTI duration e.g., the number of symbol periods in a TTI
  • the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • a control region e.g., a control resource set (CORESET)
  • CORESET control resource set
  • a control region for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier.
  • One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115.
  • one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner.
  • An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size.
  • Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
  • Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof.
  • the term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) .
  • a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates.
  • Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105.
  • a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell.
  • a small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells.
  • Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) .
  • a base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
  • protocol types e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB)
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105.
  • the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications.
  • the UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) .
  • Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) .
  • MCPTT mission critical push-to-talk
  • MCVideo mission critical video
  • MCData mission critical data
  • Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications.
  • the terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.
  • a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) .
  • D2D device-to-device
  • P2P peer-to-peer
  • One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105.
  • groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.
  • the D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) .
  • vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these.
  • V2X vehicle-to-everything
  • V2V vehicle-to-vehicle
  • a vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system.
  • vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communications, or with both.
  • V2N vehicle-to-network
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN Packet Data Network gateway
  • UPF user plane function
  • the control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130.
  • NAS non-access stratum
  • User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions.
  • the user plane entity may be connected to the network operators IP services 150.
  • the operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • Some of the network devices may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) .
  • Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) .
  • Each access network transmission entity 145 may include one or more antenna panels.
  • various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .
  • the wireless communications system 100 may operate using one or more frequency bands, for example in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors.
  • the transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • the wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band, or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
  • SHF super high frequency
  • EHF extremely high frequency
  • the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the base stations 105, and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate use of antenna arrays within a device.
  • mmW millimeter wave
  • the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions.
  • the techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
  • the wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
  • a base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.
  • the base stations 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) .
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) , where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations.
  • a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115.
  • Some signals e.g., synchronization signals, reference signals, beam selection signals, or other control signals
  • the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission.
  • Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.
  • a transmitting device such as a base station 105
  • a receiving device such as a UE 115
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
  • transmissions by a device may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115) .
  • the UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands.
  • the base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded.
  • a reference signal e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS)
  • CRS cell-specific reference signal
  • CSI-RS channel state information reference signal
  • the UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) .
  • PMI precoding matrix indicator
  • codebook-based feedback e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • receive configurations e.g., directional listening
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions.
  • receive beamforming weight sets e.g., different directional listening weight sets
  • a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
  • SNR signal-to-noise ratio
  • the wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack.
  • communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based.
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency.
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • the UEs 115 and the base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions) .
  • a device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • a UE 115 may initiate a timer for mapping one or more reference signal (e.g., SRS) ports to one or more antennas of the UE 115.
  • the UE 115 may be enabled to transmit an uplink message using the one or more reference signal ports.
  • the UE 115 may receive a downlink control message from a base station 105 which may indicate a usage type (e.g., codebook or non-codebook) of a reference signal associated with the one or more reference signal ports.
  • the UE 115 may receive SSBs from the base station 105 to perform synchronization signal measurements for each antenna of the UE 115.
  • the synchronization signal measurements may indicate channel quality information for each antennas.
  • the timer may expire or stop, and the UE 115 may map at least one of the reference signal ports to the one or more antennas based on the synchronization signal measurements and the indicated usage type. In some cases, the UE 115 may transmit the one or more uplink messages over the mapped reference signal ports.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communications system 100.
  • wireless communications system 200 may include base station 105-a, which may be an example of a base station 105 as described herein, and UE 115-a, which may be an example of a UE 115 described herein.
  • Wireless communications system 200 may implement one or more reference signal mapping schemes as described herein, which may enable a UE 115-a to transmit an uplink message with reliable communications and minimal interference, among other advantages.
  • the UE 115-a and the base station 105-a may communicate using one or more downlink transmissions 205 and one or more uplink transmissions 210.
  • UE 115-a may initiate a timer for indicating a mapping procedure of one or more reference signal ports to one or more antennas of UE 115-a.
  • parameters of the timer e.g., duration for the timer, initiation of the timer, stopping of the timer, or a combination thereof
  • UE 115-a may map one or more reference signal ports to one or more antennas of UE 115-a after expiration or stoppage of the timer.
  • the timer may be restarted after mapping the one or more reference signal ports to the one or more antennas of UE 115-a.
  • UE 115-a may receive a downlink control message 225 from base station 105-a, which may configure UE 115-a for reference signal port mapping, such as SRS port mapping.
  • downlink control message 225 may configure an antenna capability configuration of UE 115-a.
  • UE 115-a may be configured to utilize one or more transmitting antennas for uplink transmissions 210 and one or more receiving antennas for downlink transmissions 205.
  • UE 115-a may be configured for transmitting over two antennas and receiving over four antennas (e.g., 2T4R antenna capability) , which may enable UE 115-a to utilize two antennas for transmission when four antennas may be configured for reception.
  • base station 105-a may determine the antenna capability configuration of UE 115-a based on an antenna capability message 215 transmitted by UE 115-a to base station 105-a.
  • the antenna capability message 215 may indicate each antenna capability configuration the UE may support (e.g., 1T2R, 2T4R, 1T4R, 4T4R, etc. ) .
  • downlink control message 225 may indicate transmission of aperiodic SRS or periodic SRS (e.g., semi-persistent) .
  • downlink control message 225 may indicate a usage type of a SRS signal associated with the one or more reference SRS ports.
  • UE 115-a may receive the indication of the usage type via a downlink control information (DCI) message or a radio resource control (RRC) message of downlink control message 225.
  • DCI downlink control information
  • RRC radio resource control
  • the indicated usage type may include either a codebook based scheme or a non-codebook based scheme for SRS port mapping.
  • the antenna capability configuration may be transmitted in the same downlink control message 225 with the usage type indication or in a second separately transmitted downlink control message 225.
  • UE 115-a may receive one or more synchronization signal blocks (SSBs) 230 from base station 105-a to perform synchronization signal measurements for each of the antennas of UE 115-a, which may be performed during the timer.
  • UE 115-a may be configured with a 2T4R antenna capability and may therefore perform channel quality measurements for each antenna (e.g., a first antenna, a second antenna, a third antenna, a fourth antenna) of UE 115-a with time frequency resources of SSBs 230.
  • a synchronization signal measurement for an antenna may include an SNR measurement on the antenna.
  • SSBs 230 may be transmitted to UE 115-ain downlink control message 225.
  • UE 115-a may map the one or more SRS ports to one or more antennas based on the usage type of the SRS signal and the synchronization signal measurements for each of the antennas of UE 115-a after the expiration of the timer.
  • UE 115-a may be configured with a non-codebook based usage type, and may map an SRS port to the antenna having a synchronization signal measurement that exceeds a measurement threshold.
  • UE 115-a may be configured with a non-codebook based scheme and may map a first SRS port, transmitting the SRS (e.g., uplink message 235) , to a first antenna.
  • the first antenna may be associated with a highest measurement of the synchronization signal measurements measured over each antenna of UE 115-a.
  • UE 115-a may be configured with a codebook based usage type and may map one or more SRS ports to the antennas with the highest measurements (or measurements exceeding a threshold) of synchronization signal measurements based on determining the number of SRS ports for the SRS indicated by downlink control message 225.
  • the number of SRS ports for the SRS indicated by downlink control message 225 may be equal to one, two, or four ports.
  • the number of SRS port indicated by downlink control message 225 may be associated with the transmission antenna capability (e.g., 1T, 2T, 4T) configured for UE 115-a in downlink control message 225.
  • downlink control message 225 may configure a 2T4R antenna capability. Because UE 115-a may transmit the SRS in up to two antennas, the number of SRS ports may be less than or equal to two.
  • UE 115-a may be configured with a codebook based scheme and may determine a number of SRS ports for the SRS equal to one. UE 115-a may then map a first SRS port, transmitting the SRS (e.g., uplink message 235) , to a first antenna.
  • the first antenna may be associated with a highest measurement of the synchronization signal measurements over each antenna of UE 115-a.
  • UE 115-a may be configured with a codebook based scheme and may determine a number of SRS ports for the SRS equal to two. UE 115-a may then map a first SRS port and a second SRS port, each transmitting the SRS (e.g., uplink message 235) , to a first antenna and a second antenna respectively (e.g., the first SRS port mapped to the first antenna, the second SRS port mapped to the second antenna) . The first antenna and the second antenna may be associated with the two highest measurements of the synchronization signal measurements over each antenna of UE 115-a.
  • SRS e.g., uplink message 235
  • UE 115-a may be configured with a codebook based scheme and may determine a number of SRS ports for the SRS equal to four. UE 115-a may then map a first SRS port, a SRS port, a third SRS port, and a fourth SRS port, each transmitting the SRS (e.g., uplink message 235) , to a first antenna, a second antenna, a third antenna, and a fourth antenna respectively (e.g., the first SRS port mapped to the first antenna, the second SRS mapped to the second antenna, etc. ) .
  • the first, second, third, and fourth antennas may be associated with the four highest measurements of the synchronization signal measurements over each antenna of UE 115-a.
  • SRS port mapping techniques similar to those described herein may be implemented for SRS port mapping of UE 115-a configured to a number of transmitting SRS ports greater than four when UE 115-a has a number of antennas greater than four available for SRS port mapping.
  • UE 115-a may enable a PUSCH transmission to transmit over the mapped SRS ports, and the PUSCH transmission may include uplink message 235.
  • Uplink message 235 may include data signals, control signals, reference signals, or a combination thereof.
  • UE 115-a may randomly map other ports to one or more remaining antennas not respectively mapped in the SRS mapping procedure. For instance, UE 115-a may randomly map another reference signal port, an uplink data signal port, or a control signal port to an antenna not mapped as part of the SRS port mapping. In some cases, UE 115-a may map a port to each antenna until each antenna may be mapped to a port.
  • FIG. 3 illustrates an example of a process timeline 300 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • process timeline 300 may implement aspects of wireless communications system 100 or 200.
  • Process timeline 300 may include processes performed by a timer 305, a receiver 315, measurement component 320, reference signal processor 325, and transmitter 330. The processes may be performed over three periods (e.g., initializing timer period 310-a, active timer period 310-b, mapping period 310-c) .
  • Process timeline 300 may represent processes performed by a UE. As this is one example of a process timeline 300, other process timelines may be implemented based on different formats of uplink and downlink transmissions, communication parameters or schemes, or other conditions. Transmission, reception, and processing may not occur at the times illustrated by process timeline 500, but may instead occur earlier or later depending on timing parameters associated with the processes.
  • the UE may initialize a timer 305 for reference signal port mapping of one or more reference signal ports to one or more antennas of the UE during the initializing timer period 310-a.
  • the transmitter 330 may transmit an antenna capability message to a base station for the base station to select an antenna capability for the UE.
  • the antenna capability message may indicate each antenna capability configuration the UE may support (e.g., 1T2R, 2T4R, 1T4R, 4T4R, etc. ) for the receiver 315 and the transmitter 330.
  • the UE may be configured for transmitting over two antennas and receiving over four antennas (e.g., 2T4R antenna capability) .
  • the receiver 315 may receive a configuration message from the base station which may indicate parameters of the timer 305 such as duration for the timer, initiation of the timer, stopping of the timer, or a combination thereof.
  • the receiver 315 may direct the configuration message to the reference signal processor 325.
  • the reference signal processor 325 may configure the received parameters of the timer 305 for the UE and may initiate the timer 305 to begin the active timer period 310-b at 350.
  • the UE may determine the reference signal port mapping scheme and channel quality indicators during the active timer period 310-b.
  • the receiver 315 may receive a downlink control message from the base station.
  • the downlink control channel may indicate to utilize reference signal port mapping, such as SRS port mapping.
  • the downlink control message may indicate the antenna capability configuration of the UE based on the antenna capability message transmitted at 335. For instance, the downlink control message may indicate a 2T4R configuration if the antenna capability message indicated 2T4R as a supported antenna capability configuration for the UE.
  • the downlink control message may indicate a usage type of a reference signal associated with the one or more reference signal ports.
  • the receiver 315 may receive the indication of the usage type via a DCI message or an RRC message that carries or includes the downlink control message.
  • the indicated usage type may include either a codebook based scheme or a non-codebook based scheme for SRS port mapping.
  • the antenna capability configuration may be received by the receiver 315 in the same downlink control message as the usage type indication or in a second separately received downlink control message.
  • the receiver 315 may direct the downlink control message to the reference signal processor 325 to configure the reference port mapping scheme as either non-codebook based or codebook as well as configure the antenna capability configuration for the UE at 360.
  • the reference signal processor 325 may determine the number of reference signal ports from the downlink control message at 360. In some examples, the number of reference signal ports for the reference signal indicated by downlink control message may be equal to one, two, or four ports. In some cases, the antenna capability configuration directed to the reference signal processor at 355-b may be configured for the UE (e.g., receiver 315 and transmitter 330) at 360. For example, the reference signal processor 325 may configure a 2T4R antenna capability for the UE. Because the UE may transmit the reference signal in up to two antennas in the transmitter 330, the number of reference signal ports may be less than or equal to two.
  • the receiver 315 may receive SSBs from the base station.
  • the receiver 315 may direct the SSBs to the measurement component 320 at 365-b.
  • the SSBs may be received by the receiver 315 (e.g., transmitted by the base station) prior to the receiver 315 receiving the downlink control message at 355-a.
  • the SSBs may be directed to the measurement component 320 prior to the receiver 315 directing the downlink control message to the reference signal processor 325 at 355-b.
  • the SSBs may be received in the downlink control message at 335-a.
  • the measurement component 320 may utilize the SSBs to perform synchronization signal measurements on each antenna of UE at 370.
  • the UE may be configured with a 1T4R antenna capability.
  • the measurement component 320 may perform synchronization signal measurements for each antenna (e.g., a first antenna, a second antenna, a third antenna, a fourth antenna) of the UE with time frequency resources of the SSBs at 370.
  • the measurement component may direct the synchronization signal measurements of each antenna to the reference signal processor 325 at 375 for the reference signal processor 325 to map at least one or more reference signal ports to one or more antennas of the UE.
  • the timer 305 may be inactive as the active timer period expires.
  • the reference signal processor 325 may map at least one of the reference signal ports to the one or more antennas based on the synchronization signal measurements indicated to the reference signal processor 325 at 375 and the usage type configured at 360. In some examples, the reference signal processor 325 may configure the reference signal port mapping scheme with a non-codebook based usage type. The reference signal processor 325 may therefore map a reference signal port to the antenna with a highest measurement of the synchronization signal measurements of the antennas.
  • the reference signal port mapping scheme of the UE may be configured as non-codebook based and may map a first reference signal port, transmitting the reference signal (e.g., uplink message) , to a first antenna.
  • the first antenna may be associated with a highest measurement of the synchronization signal measurements measured over each antenna of the UE.
  • the reference signal processor 325 may configure the reference signal port mapping scheme with a codebook based usage type and may map one or more reference signal ports to the antennas with the highest measurements of synchronization signal measurements based on determining the number of reference signal ports for the reference signal at 360 or the transmission antenna capability (e.g., 1T, 2T, 4T) configured for the transmitter 330 at 360.
  • the transmission antenna capability e.g., 1T, 2T, 4T
  • the reference signal processor 325 may configure the reference signal port mapping scheme with a codebook based usage type and may determine a number of reference signal ports for the reference signal equal to one. The reference signal processor 325 may then map a first reference signal port, transmitting the reference signal (e.g., uplink message) , to a first antenna.
  • the first antenna may be associated with a highest measurement of the synchronization signal measurements over each antenna of the UE.
  • the reference signal processor 325 may configure the reference signal port mapping scheme with a codebook based usage type and may determine a number of reference signal ports for the reference signal equal to two. The reference signal processor 325 may then map a first reference signal port and a second reference signal port, each transmitting the reference signal (e.g., uplink message) , to a first antenna and a second antenna respectively (e.g., the first reference signal port mapped to the first antenna, the second reference signal port mapped to the second antenna) . The first antenna and the second antenna may be associated with the two highest measurements of the synchronization signal measurements over each antenna of the UE.
  • the reference signal e.g., uplink message
  • the reference signal processor 325 may configure the reference signal port mapping scheme with a codebook based usage type and may determine a number of reference signal ports for the reference signal equal to four.
  • UE 115-a may then map a first reference signal port, a reference signal port, a third reference signal port, and a fourth reference signal port, each transmitting the reference signal (e.g., uplink message) , to a first antenna, a second antenna, a third antenna, and a fourth antenna respectively (e.g., the first reference signal port mapped to the first antenna, the second reference signal mapped to the second antenna, etc. ) .
  • the first, second, third, and fourth antennas may be associated with the four highest measurements of the synchronization signal measurements over each antenna of the UE.
  • reference signal port mapping techniques similar to those described herein may be implemented for reference signal port mapping of the UE configured to a number of transmitting reference signal ports greater than four when the UE has a number of antennas greater than four.
  • the reference signal processor 325 may transmit an uplink message at over the mapped reference signal ports (e.g., over transmitter 330) , and the uplink message may include data signals, control signals, reference signals, or a combination thereof.
  • the reference signal processor 325 may randomly map other ports to one or more remaining antennas not respectively mapped in the reference signal mapping procedure. For instance, the reference signal processor 325 may randomly map another reference signal port, an uplink data signal port, or a control signal port to an antenna not mapped for the original reference signal transmission. In some cases, reference signal processor 325 may map a port to each antenna until each antenna may be mapped to a port.
  • the reference signal processor 325 may reinitiate the timer 305, which may return the process to the start of the active timer period 310-b.
  • FIG. 4 illustrates an example of a process flow 400 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • process flow 400 may implement aspects of wireless communications systems 100 or 200.
  • Process flow 400 may be implemented by a UE 115-b and a base station 105-b, which may be examples of the corresponding devices as described herein.
  • UE 115-b may optionally transmit an antenna capability message to the base station 105-b.
  • the antenna capability message may indicate information related to the antenna (s) of the UE 115-b.
  • the antenna capability message may indicate a number of antennas at the UE 115-b, a number of transmit or receive antennas available for use at the UE 115-b, an antenna configuration (e.g., 2T4R antenna capability) , or any combination thereof.
  • the base station 105-b may optionally transmit a configuration message to the UE 115-b.
  • the configuration message may be transmitted in response to the antenna capability message transmitted by the UE 115-b at 405.
  • the configuration message may be for a timer maintained by the UE 115-b for mapping one or more reference signal ports (e.g., SRS ports) to one or more antennas (or antenna ports) of the UE 115-b.
  • the configuration message may indicate a duration for the timer, or may trigger the timer to start, stop, or reset, or any combination thereof.
  • the UE 115-b may initiate a timer.
  • the timer may be maintained by the UE 115-b and may be for mapping one or more reference signal ports (e.g., SRS ports) to one or more antennas (or antenna ports) of the UE 115-b.
  • the timer may be initiated in response to the configuration message transmitted by the base station at 410, and may be based on information (e.g., duration for the timer) included in the configuration message.
  • the timer may be associated with a configured or predefined duration, and may be initiated at the UE 115-b independent of signaling received from the base station 105-b.
  • the base station 105-b may transmit a downlink control message to the UE 115-b.
  • the downlink control message may be a DCI message (which may be carried by a PDCCH) , an RRC message, or another control message for the UE 115-b.
  • the downlink control message may indicate a usage type for the reference signal (e.g., SRS) .
  • the usage type may be one of a codebook based scheme or a non-codebook based scheme for the reference signal (e.g., SRS) .
  • the base station 105-b may transmit one or more SSBs to the UE 115-b.
  • the SSBs may be transmitted by the base station 105-b periodically and in some cases may be broadcast to a group of UEs including UE 115-b.
  • the UE 115-b may perform synchronization signal measurements based on the SSBs transmitted by the base station at 425. For example, the UE 115-b may measure one or more synchronization signals included in the SSBs. In some cases, the UE 115-b may measure a set of synchronization signals at multiple antennas or each antenna of the UE 115-b to obtain synchronization signal measurements.
  • the UE 115-b may optionally determine the number of SRS ports for mapping. For instance, the UE 115-b may determine the number of SRS ports based on the downlink control message received at 420, or another message from the base station 105-b that indicates nrofSRS-Ports (e.g., port1, port2, port4) .
  • nrofSRS-Ports e.g., port1, port2, port4
  • the UE 115-b may map reference signal ports or other ports to antennas of the UE 115-b.
  • the UE 115-b may map SRS ports to a respective antenna of the one or more antennas of the UE 115-b based on the usage type indicated by the downlink control message at 420 and the synchronization signal measurements performed at 430.
  • the UE 115-b may map the reference signal port (s) or other port (s) after expiration or stoppage of the timer.
  • the UE 115-b may map the reference signal port to the respective antenna based on the usage type indicating the non-codebook based scheme, where a synchronization signal measurement for the respective antenna exceeds a measurement threshold. In some examples, the UE 115-b may map the reference signal port to the respective antenna based on the usage type indicating the codebook based scheme, where a synchronization signal measurement for the respective antenna exceeds a measurement threshold. In some examples, the UE 115-b may map one or more reference signal ports to respective antennas, where each a synchronization signal measurement for the respective antennas exceeds the measurement threshold.
  • the UE 115-b may map any remaining ports randomly to the antennas (or antenna ports) of the UE 115-b. In some examples, the UE 115-b may restart or reset the timer after mapping.
  • the UE 115-b may transmit an uplink signal to the base station 105-b.
  • the uplink signal may be an SRS or other signal and may be transmitted using the antennas to which the signal (s) are mapped.
  • the UE 115-b may transmit one or more SRS signals based on the SRS ports being mapped to antennas of the UE 115-b having measurements exceeding a measurement threshold.
  • FIG. 5 shows a block diagram 500 of a device 505 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the device 505 may be an example of aspects of a UE 115 as described herein.
  • the device 505 may include a receiver 510, a communications manager 515, and a transmitter 520.
  • the device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to port to antenna mapping for uplink communications, etc. ) . Information may be passed on to other components of the device 505.
  • the receiver 510 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the receiver 510 may utilize a single antenna or a set of antennas.
  • the communications manager 515 may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE, receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme, perform respective synchronization signal measurements for each of the one or more antennas of the UE, and map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the communications manager 515 may be an example of aspects of the communications manager 810 described herein.
  • the communications manager 515 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 515, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • code e.g., software or firmware
  • ASIC application-specific integrated circuit
  • the communications manager 515 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 515, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 515, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 520 may transmit signals generated by other components of the device 505.
  • the transmitter 520 may be collocated with a receiver 510 in a transceiver module.
  • the transmitter 520 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the transmitter 520 may utilize a single antenna or a set of antennas.
  • communications manager 515 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 510 and transmitter 520 may be implemented as analog components (e.g., amplifiers, filters, antennas, etc. ) coupled with the mobile device modem to enable wireless transmission and reception.
  • analog components e.g., amplifiers, filters, antennas, etc.
  • the communications manager 515 as described herein may be implemented to realize one or more potential advantages.
  • Various implementations may enable the device 505 to map reference signal ports (e.g., SRS ports) to antennas of the device 505 based on measurements at each of the antennas of the device 505.
  • the device 505 may map reference signal ports to antennas having channel quality measurements (e.g., RSRP measurements, CSI measurements, CQI measurements) above a given threshold, which may enable the device 505 to transmit reference signals with a greater likelihood of reception.
  • channel quality measurements e.g., RSRP measurements, CSI measurements, CQI measurements
  • one or more processors of the device 505 may reduce signaling overhead by utilizing antennas for reference signal transmissions having a threshold quality or measurement, which may increase transmission success and quality of the reference.
  • processors of the device 505 e.g., processor (s) controlling or incorporated with one or more of receiver 510, communications manager 515, and transmitter 520
  • One or more techniques described herein may increase the likelihood that SRSs will successfully be received by other network devices (e.g., a base station) , which may increase overall communications efficiency.
  • FIG. 6 shows a block diagram 600 of a device 605 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the device 605 may be an example of aspects of a device 505, or a UE 115 as described herein.
  • the device 605 may include a receiver 610, a communications manager 615, and a transmitter 640.
  • the device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to port to antenna mapping for uplink communications, etc. ) . Information may be passed on to other components of the device 605.
  • the receiver 610 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the receiver 610 may utilize a single antenna or a set of antennas.
  • the communications manager 615 may be an example of aspects of the communications manager 515 as described herein.
  • the communications manager 615 may include a timer component 620, a control message receiver 625, a measurement component 630, and a mapping component 635.
  • the communications manager 615 may be an example of aspects of the communications manager 810 described herein.
  • the timer component 620 may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the control message receiver 625 may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • the measurement component 630 may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the mapping component 635 may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the transmitter 640 may transmit signals generated by other components of the device 605.
  • the transmitter 640 may be collocated with a receiver 610 in a transceiver module.
  • the transmitter 640 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the transmitter 640 may utilize a single antenna or a set of antennas.
  • FIG. 7 shows a block diagram 700 of a communications manager 705 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the communications manager 705 may be an example of aspects of a communications manager 515, a communications manager 615, or a communications manager 810 described herein.
  • the communications manager 705 may include a timer component 710, a control message receiver 715, a measurement component 720, a mapping component 725, a message transmitter 730, an antenna selection component 735, and a configuration message receiver 740. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the timer component 710 may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the timer component 710 may restart the timer based on the mapping.
  • the control message receiver 715 may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • control message receiver 715 may receive an indication of the usage type in one of a downlink control information message or a radio resource control message.
  • the measurement component 720 may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the mapping component 725 may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the mapping component 725 may map the reference signal port to the respective antenna based on the usage type indicating the non-codebook based scheme, where a synchronization signal measurement for the respective antenna exceeds a measurement threshold.
  • the mapping component 725 may map the reference signal port to the respective antenna based on the usage type indicating the codebook based scheme.
  • the mapping component 725 may map the reference signal port to the respective antenna based on determining that a number of reference signal ports for the reference signal indicated by the downlink control message equals one.
  • the mapping component 725 may map a second reference signal port of the one or more reference signal ports to a second respective antenna based on determining that a number of reference signal ports for the reference signal indicated by the downlink control message equals two.
  • the mapping component 725 may map, based on determining that a number of reference signal ports for the reference signal indicated by the downlink control message equals four, a second reference signal port of the one or more reference signal ports to a second respective antenna, and a third reference signal port of the one or more reference signal ports to a third respective antenna.
  • the mapping component 725 may randomly map remaining reference signal ports of the one or more reference signal ports to the one or more antennas of the UE excluding the respective antenna.
  • the reference signal port is associated with an index value of 0.
  • the message transmitter 730 may transmit an uplink message using the respective antenna based on the mapping.
  • the antenna selection component 735 may select the respective antenna based on the respective synchronization signal measurements, where a synchronization signal measurement for the respective antenna exceeds a measurement threshold.
  • the antenna selection component 735 may select the second respective antenna based on the respective synchronization signal measurements, where a synchronization signal measurement for the second respective antenna exceeds the measurement threshold.
  • the antenna selection component 735 may select the third respective antenna based on the respective synchronization signal measurements, where a synchronization signal measurement for the third respective antenna exceeds the measurement threshold.
  • the configuration message receiver 740 may receive a configuration message from a base station, the configuration message indicating a duration for the timer, an initiation of the timer, a stopping of the timer, or any combination thereof.
  • FIG. 8 shows a diagram of a system 800 including a device 805 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the device 805 may be an example of or include the components of device 505, device 605, or a UE 115 as described herein.
  • the device 805 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 810, an I/O controller 815, a transceiver 820, an antenna 825, memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., bus 845) .
  • buses e.g., bus 845
  • the communications manager 810 may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE, receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme, perform respective synchronization signal measurements for each of the one or more antennas of the UE, and map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the I/O controller 815 may manage input and output signals for the device 805.
  • the I/O controller 815 may also manage peripherals not integrated into the device 805.
  • the I/O controller 815 may represent a physical connection or port to an external peripheral.
  • the I/O controller 815 may utilize an operating system such as or another known operating system.
  • the I/O controller 815 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 815 may be implemented as part of a processor.
  • a user may interact with the device 805 via the I/O controller 815 or via hardware components controlled by the I/O controller 815.
  • the transceiver 820 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described herein.
  • the transceiver 820 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 820 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 825. However, in some cases the device may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 830 may include RAM and ROM.
  • the memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 830 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 840 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 840 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 840.
  • the processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting port to antenna mapping for uplink communications) .
  • the code 835 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 835 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory.
  • the code 835 may not be directly executable by the processor 840 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 9 shows a flowchart illustrating a method 900 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the operations of method 900 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 900 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein.
  • a UE may perform aspects of the functions described herein using special-purpose hardware.
  • the UE may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the operations of 905 may be performed according to the methods described herein. In some examples, aspects of the operations of 905 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • the UE may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • the operations of 910 may be performed according to the methods described herein. In some examples, aspects of the operations of 910 may be performed by a control message receiver as described with reference to FIGs. 5 through 8.
  • the UE may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the operations of 915 may be performed according to the methods described herein. In some examples, aspects of the operations of 915 may be performed by a measurement component as described with reference to FIGs. 5 through 8.
  • the UE may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the operations of 920 may be performed according to the methods described herein. In some examples, aspects of the operations of 920 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • FIG. 10 shows a flowchart illustrating a method 1000 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the operations of method 1000 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein.
  • a UE may perform aspects of the functions described herein using special-purpose hardware.
  • the UE may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • the UE may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • the operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a control message receiver as described with reference to FIGs. 5 through 8.
  • the UE may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a measurement component as described with reference to FIGs. 5 through 8.
  • the UE may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • the UE may map the reference signal port to the respective antenna based on the usage type indicating the non-codebook based scheme, where a synchronization signal measurement for the respective antenna exceeds a measurement threshold.
  • the operations of 1025 may be performed according to the methods described herein. In some examples, aspects of the operations of 1025 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • FIG. 11 shows a flowchart illustrating a method 1100 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein.
  • a UE may perform aspects of the functions described herein using special-purpose hardware.
  • the UE may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • the UE may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • the operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a control message receiver as described with reference to FIGs. 5 through 8.
  • the UE may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a measurement component as described with reference to FIGs. 5 through 8.
  • the UE may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • the UE may map the reference signal port to the respective antenna based on the usage type indicating the codebook based scheme.
  • the operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • FIG. 12 shows a flowchart illustrating a method 1200 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the operations of method 1200 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1200 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein.
  • a UE may perform aspects of the functions described herein using special-purpose hardware.
  • the UE may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • the UE may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • the operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a control message receiver as described with reference to FIGs. 5 through 8.
  • the UE may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed by a measurement component as described with reference to FIGs. 5 through 8.
  • the UE may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • the UE may map the reference signal port to the respective antenna based on the usage type indicating the codebook based scheme.
  • the operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • the UE may randomly map remaining reference signal ports of the one or more reference signal ports to the one or more antennas of the UE excluding the respective antenna.
  • the operations of 1230 may be performed according to the methods described herein. In some examples, aspects of the operations of 1230 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • FIG. 13 shows a flowchart illustrating a method 1300 that supports port to antenna mapping for uplink communications in accordance with aspects of the present disclosure.
  • the operations of method 1300 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1300 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein.
  • a UE may perform aspects of the functions described herein using special-purpose hardware.
  • the UE may receive a configuration message from a base station, the configuration message indicating a duration for the timer, an initiation of the timer, a stopping of the timer, or any combination thereof.
  • the operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed by a configuration message receiver as described with reference to FIGs. 5 through 8.
  • the UE may initiate a timer for mapping one or more reference signal ports to one or more antennas of the UE.
  • the operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • the UE may receive a downlink control message that indicates a usage type of a reference signal associated with the one or more reference signal ports, the usage type indicating one of a codebook based scheme or a non-codebook based scheme.
  • the operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a control message receiver as described with reference to FIGs. 5 through 8.
  • the UE may perform respective synchronization signal measurements for each of the one or more antennas of the UE.
  • the operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by a measurement component as described with reference to FIGs. 5 through 8.
  • the UE may map, after expiration of the timer, a reference signal port of the one or more reference signal ports to a respective antenna of the one or more antennas of the UE based on the usage type and the respective synchronization signal measurements for each of the one or more antennas.
  • the operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by a mapping component as described with reference to FIGs. 5 through 8.
  • LTE, LTE-A, LTE-A Pro, or NR may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks.
  • the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
  • UMB Ultra Mobile Broadband
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer.
  • non-transitory computer-readable media may include random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash memory compact disk (CD) ROM or other optical disk storage
  • CD compact disk
  • magnetic disk storage or other magnetic storage devices or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer,
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés, des systèmes et des dispositifs pour des communications sans fil. Un équipement d'utilisateur (UE) peut initier un temporisateur pour mettre en correspondance un ou plusieurs ports de signal de référence avec une ou plusieurs antennes de l'UE. L'UE peut recevoir un message de commande de liaison descendante en provenance de la station de base qui peut indiquer un type d'utilisation d'un signal de référence associé auxdits ports de signal de référence, et le type d'utilisation peut être un schéma basé sur un livre de codes ou un schéma non basé sur un livre de codes. L'UE peut recevoir des blocs de signal de synchronisation (SSB) en provenance de la station de base pour effectuer des mesures de signal de synchronisation pour chacune des antennes de l'UE. À l'expiration du temporisateur, l'UE peut mettre en correspondance au moins l'un des ports de signal de référence avec lesdites antennes sur la base des mesures de signal de synchronisation et du type d'utilisation indiqué.
PCT/CN2020/098341 2020-06-27 2020-06-27 Mise en correspondance de port avec antenne pour communications de liaison montante WO2021258400A1 (fr)

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CN102332945A (zh) * 2011-09-30 2012-01-25 中兴通讯股份有限公司 一种信息反馈方法及用户设备
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CN102332945A (zh) * 2011-09-30 2012-01-25 中兴通讯股份有限公司 一种信息反馈方法及用户设备
US20160088512A1 (en) * 2014-09-23 2016-03-24 Telefonaktiebolaget L M Ericsson (Publ) Reference signal density adaptation
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