WO2019141866A1 - Communication de signaux de liaison montante - Google Patents

Communication de signaux de liaison montante Download PDF

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Publication number
WO2019141866A1
WO2019141866A1 PCT/EP2019/051467 EP2019051467W WO2019141866A1 WO 2019141866 A1 WO2019141866 A1 WO 2019141866A1 EP 2019051467 W EP2019051467 W EP 2019051467W WO 2019141866 A1 WO2019141866 A1 WO 2019141866A1
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WO
WIPO (PCT)
Prior art keywords
carriers
carrier
uplink
time
base station
Prior art date
Application number
PCT/EP2019/051467
Other languages
English (en)
Inventor
Erik Bengtsson
Olof Zander
Original Assignee
Sony Mobile Communications Inc.
Sony Mobile Communications Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Mobile Communications Inc., Sony Mobile Communications Ab filed Critical Sony Mobile Communications Inc.
Publication of WO2019141866A1 publication Critical patent/WO2019141866A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • Various embodiments of the invention generally relate to communicating uplink signals, for example from a terminal device to a base station.
  • Various examples of the invention specifically relate to communicating uplink signals, in particular uplink pilot signals, in time frequency resources allocated on a plurality of carriers at staggered time intervals.
  • a so called multiple- input and multiple-output technology may be used in wireless radio fre- quency telecommunications for transmitting information between a base station and a terminal device, for example a user equipment device like a mobile tele- phone.
  • the MIMO technology relates to the use of multiple send and receive antennas for a wireless communication at a base station and/or at a terminal de- vice.
  • the MIMO technology forms the basis for coding methods, which use the temporal as well as the spatial dimension for transmitting information and enables therefore a space and time coding. Thus, a quality and data rate of the wireless communication may be increased.
  • the base station may include a large number of antennas, for example, several tens or even in excess of one hundred antennas with associated transceiver cir- cuitry. Systems comprising such base stations are also called massive MIMO systems.
  • the extra antennas of the massive MIMO base station allow radio en- ergy to be spatially focused in transmissions as well as a directional sensitive reception, which improves spectral efficiency and radiated energy efficiency.
  • all or multiple beams or signals from differ- ent radiation paths may be coherently combined such that a higher gain may be achieved.
  • the terminal device may include a plurality of antennas to allow radio energy to be spatially focused in transmissions as well as a directional sensitive reception, which improves spectral efficiency and radiated energy efficiency.
  • a base sta- tion logic needs information about wireless radio channel properties between the terminal device and the antennas of the base station.
  • a pilot signaling scheme a so-called channel sounding, is used for this purpose, which allows the base sta- tion to set configuration antenna parameters for transmitting signals, so as to fo- cus radio energy at the terminal device and/or for receiving radio signals from the terminal device.
  • focus may mean both phase align contribution with differ ent path lengths and transmit only in directions that will reach the terminal device.
  • Training sequences, so-called pilot signals may be transmitted from the terminal device in a resource that is dedicated to the terminal device.
  • Pilot signals from different terminal devices need to be orthogonal in order for the base station to identify the configuration parameters for the plurality of antennas for each one of the terminal devices. Orthogonality may be achieved by using time division mul- tiple access (TDMA), code division multiple access (CDMA) or frequency division multiple access (FDMA) technologies or a combination thereof.
  • TDMA time division mul- tiple access
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • systems according to LTE (Long Term Evolution) technologies and standards support both frequency division duplex (FDD) and time division duplex (TDD) modes. While FDD makes use of paired spectra for uplink (UL) and down- link (DL) transmission separated by a duplex frequency gap, TDD splits one fre- quency carrier into alternating time periods for transmission from the base station to the terminal device and vice versa.
  • the LTE transmission is structured in the time domain in radio frames. Each of these radio frames is 10 ms long and consists of 10 sub-frames of 1 ms each.
  • the Orthogonal Frequency Division Multiple Access (OFDMA) sub-carrier spacing in the frequency domain is 15 kHz. Twelve of these sub-carriers together allocated during a 0.5 ms timeslot are called a resource block. Each resource block may contain a plurality of resource elements.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • An LTE terminal device can be allocated, in the downlink or uplink, a minimum of two resource blocks during one sub-frame (1 ms).
  • a resource block defined by its time slot and set of sub- carriers, is the smallest unit of resources that can be allocated to a terminal device or user.
  • Data transmitted via resource blocks in a plurality of consecutive frames is also called "stream".
  • each terminal device can transmit a pilot signal in a specifically allocated resource (defined by its time slot and frequency range within a frame). The pilot signal can be received by the antennas of the base station and analyzed by the base station logic for channel sounding the uplink radio channel.
  • the base station may transmit a pilot signal in an allo cated resource to a terminal device for channel sounding the downlink radio chan- nel.
  • the timeslots and frequency ranges, in which terminal devices may transmit their pilot signals in combination, are also referred to as pilot portion of a trans- mission frame.
  • the remaining timeslots and frequency ranges of the frame may be used for downlink (DL) and uplink (UL) data and control transmission.
  • the pilot signals may each include a training sequence, and the pilot signals received at the plurality of antennas of the base station are analyzed by the base station logic. Information about a radio channel property of the radio channel between the terminal device and the plurality of antennas may be obtained as a result of this analysis.
  • a base station may use the results of the analysis to determine configuration parameters for transmitting signals via the antennas to the respec- tive terminal devices and for receiving signals via the antennas from the respec- tive terminal devices. For example, based on the received uplink pilot signal, re- ceive configuration parameters may be obtained and transmit configuration pa- rameters may be obtained based on reciprocity.
  • a terminal device may communicate at a plurality of carriers, for example in LTE (Long-Term Evolution) and 5G-NR (5th Generation New Radio) communication network environments.
  • the frequency bands of the different communication network environments may be separated or overlapping.
  • low frequency bands below 1 GHz mid frequency bands from 1 GHz to 3 GHz, high frequency bands 3 GHz to 6 GHz and frequencies far above 6 GHz (known as millimeter wave) may be utilized.
  • frequency bands in the range of 1 GHz to 3 GHz may be utilized.
  • terminal devices for example handsets like mobile phones, pro- vide two or even more antennas for cellular communication.
  • the antennas of the terminal device are typically arranged spaced apart from each other at or within the housing of the terminal device, e.g. one antenna at a top and one at a bottom of the terminal device.
  • channel sounding may be needed for all antennas of the terminal device.
  • the terminal device may provide a corresponding number of receiver chains as required for simultaneous signal transmissions on each antenna and in each supported band such that MIMO downlink communication may be supported in each band.
  • the terminal device may provide a lower number of transmitter chains than required for simultaneous signal transmissions on each antenna and in each supported band. For example, only a single transmitter chain may be provided at the termi- nal device which may be selectively connected to each antenna and which may need reconfiguration for transmitting signals in different bands.
  • a method comprises communicating an uplink control message from a terminal to a base station.
  • the uplink control message is indicative of a contemporaneous transmit capability of at least one transmitter chain of the terminal on a plurality of carriers.
  • the method further comprises communicating uplink signals in time- frequency resources allocated on the plurality of carriers and scheduled in ac- cordance with the contemporaneous transmit capability.
  • a computer program product or computer program includes program code. Exe- cution of the program code causes control circuitry to perform a method of oper- ating a device, for example a terminal or a base station.
  • the method includes communicating an uplink control message from a terminal to a base station.
  • the uplink control message is indicative of a contemporaneous transmit capability of at least one transmitter chain of the terminal on a plurality of carriers.
  • the method further comprises communicating uplink signals in time-frequency resources al- located on the plurality of carriers and scheduled in accordance with the contem- poraneous transmit capability.
  • a device includes control circuitry.
  • the control circuitry is configured to perform a method.
  • the method includes communicating an uplink control message from a terminal to a base station.
  • the uplink control message is indicative of a contem- poraneous transmit capability of at least one transmitter chain of the terminal on a plurality of carriers.
  • the method further comprises communicating uplink sig- nals in time-frequency resources allocated on the plurality of carriers and sched- uled in accordance with the contemporaneous transmit capability.
  • FIG. 1 schematically illustrates communication on a wireless link between a BS and a UE according to various examples.
  • FIG. 2 schematically illustrates communication on a wireless link between a BS and a UE according to various examples, wherein FIG. 2 further illustrates multi- pie propagation paths associated with multiple beams.
  • FIG. 3 schematically illustrates an arrangement of carriers and subcarriers in fre- quency bands.
  • FIG. 4 schematically illustrates time-frequency resource definition.
  • FIG. 5 is a flowchart of a method according to various examples.
  • FIG. 6 is a signaling diagram associated with resource allocation and uplink signal communication according to various examples.
  • FIG. 7 schematically illustrates receiver and transmitter chains of a device ac- cording to various examples.
  • the drawings are to be regarded as being schematic representations and ele- ments are not necessarily shown to scale. Rather, the various elements are rep- resented such that their function and general purpose become apparent to a per- son skilled in the art. Any connection or coupling between functional blocks, de- vices, components, or other physical or functional units shown in the drawings or described herein may also be implemented by an indirect connection or coupling. A coupling between components may also be established over a wireless con- nection.
  • Functional blocks may be implemented in hardware, firmware, software, or a combination thereof.
  • the network may be a cellular network including multiple cells, wherein each cell is defined by one or more base stations (BSs).
  • BSs base stations
  • Example net- work architectures include the 3GPP LTE and 5G-NR architecture.
  • 3GPP LTE a wireless channel is defined according to the evolved UMTS Terres- trial Radio Access (EUTRAN). Similar techniques can be readily applied to vari- ous kinds of 3GPP-specified architectures, such as Global Systems for Mobile Communications (GSM), Wideband Code Division Multiplex (WCDMA), General Packet Radio Service (GPRS), Enhanced Data Rates for GSM Evolution (EDGE), Enhanced GPRS (EGPRS), Universal Mobile Telecommunications System (UMTS), and High Speed Packet Access (HSPA), and corresponding architec- tures of associated cellular networks.
  • GSM Global Systems for Mobile Communications
  • WCDMA Wideband Code Division Multiplex
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • EEGPRS Enhanced GPRS
  • UMTS Universal Mobile Telecommunications System
  • HSPA High Speed Packet Access
  • such techniques may be ap- plied in 3GPP NB-loT or eMTC networks and 3GPP New Radio (NR) networks.
  • respective techniques may be readily applied to various kinds of non-3GPP-specified architectures, such as Bluetooth, satellite communication, IEEE 802.11x Wi-Fi technology, etc.
  • the techniques described herein may facilitate determining beams or spatially directed radio signals used for transmission of data - e.g., payload data such as application data or control data such as Layer 2 or Layer 3 control data between for example a base station and a terminal device. These techniques may utilize a plurality of antennas at the base station and/or at the terminal device. As such, the techniques described herein may generally facilitate efficient beamforming and/or spatial diversity, for example as defined according to MIMO techniques. Facilitating beamforming may, in turn, facilitate spatial multiplexing at high fre- quencies, e.g., above 1 GHz or 10 GHz or even above 50 GHz. For example, for adjusting antenna weights, a channel sounding may be required.
  • a sounding reference signal (SRS) or pilot signal may be transmitted uplink from the terminal device to the base station.
  • the base station may determine and adjust antenna weights for downlink trans- missions.
  • the techniques described herein facilitate communication of uplink signals from the terminal device to the base station.
  • an uplink control message is communicated from the ter- minal device to a base station.
  • the uplink control message is indicative of con- temporaneous transmit capability of at least one transmitter chain of the terminal device on the plurality of carriers.
  • Uplink signals are communicated in time-fre- quency resources allocated on the plurality of carriers and scheduled in accord- ance with the contemporaneous transmit capability.
  • the terminal device may have restricted capabilities to trans- mit uplink signals at the same time from each antenna or the terminal device may have restricted capabilities to transmit uplink signals in different carriers at the same time.
  • the base station may allocate time-frequency resources such that required transmissions, for example transmissions of SRS or pilot sig nals, are located to the resources which are not time-overlapping. This may ena- ble for example accurate channel sounding in case of restricted hardware capa- bilities of the terminal device even in higher rank DL MIMO communication or DL carrier aggregation (CA) or MIMO communication in dual connectivity band com- binations of LTE and 5G-NR.
  • CA DL carrier aggregation
  • the contemporaneous transmit capability may indicate that the at least one transmitter chain is not able to contemporaneously transmit uplink sig nals on the first carrier and a second carrier of the plurality of carriers.
  • the transmitter chain may be reconfigurable to transmit a signal on another carrier, with this configuration it is not possible to transmit uplink signals at the same time on a first carrier and a second carrier which is different from the first carrier.
  • This restriction may be communicated to the base station with the uplink control message such that the base station allocates non- time-overlapping resources for transmitting signals on the first carrier and the second carrier.
  • the time-frequency resources allocated in the first carrier of the plu- rality of carriers are offset in time domain from the time-frequency resources al- located in the second carrier of the plurality of carriers.
  • the base station may determine such a resource allocation based on the received uplink control message, and may communicate this resource allocation to the terminal device for communicating the uplink signals in the first and second carriers.
  • the terminal may signal a timing interval required for carrier switching.
  • the uplink control message may be indicative of the timing interval required for carrier switching, for example for reconfiguring a transmitter chain from transmitting on a first carrier to a second carrier.
  • the contem- poraneous transmit capability may include indicators including a minimum time offset between SRS resources associated with different carriers.
  • the contemporaneous transmit capability may indicate that at least one transmitter chain is able to contemporaneously transmit uplink sig- nals in at least two carriers of the plurality of carriers. Based on this information, the base station may allocate time-overlapping time-frequency resources in the at least two carriers indicated in the uplink control message. In other words, in- stead of communicating restrictions on the transmitter chains of the terminal de- vice, the terminal device may communicate positively the capabilities for contem- poraneous signal transmissions on a plurality of carriers. Depending on the hard- ware restrictions and capabilities of the terminal device, communicating positive indications may require less communication capacity and may therefore be even more efficient. According to further examples, the contemporaneous transmit capability includes indicators indicative of combinations of carriers of the plurality of carriers for which contemporaneous transmission is allowed or inhibited.
  • the indicators may include a list of the combinations, for example a list of allowed combinations and/or a list of prohibited combinations. This may provide comprehensive possibilities for indicating contemporaneous transmit ca- pabilities.
  • the indicators may include pointers to predefined combina- tions, for example to predefined allowed combinations and/or predefined prohib- ited combinations. This may enable a compact communication of the uplink con- trol message.
  • the indicators may include a response to a set of at least one proposed carrier combination, which may be proposed by a base station or which may be proposed by a network control layer of the communication network.
  • the plurality of carriers may reside in one or more bands. For example, based on a bandwidth supported by the power amplifier of a transmitter chain, a plurality of carriers within a same band may be contemporaneously transmitted by the trans- mitter chain, whereas it may be not possible to transmit carriers in different bands contemporaneously with the transmitter chain.
  • the center frequency of the first carrier of the plurality of car- riers and the center frequency of the second carrier of the plurality of carriers deviate from each other for not more than 10%, optionally not more than 20%, further optionally not more than 40%.
  • the terminal device may provide only one transmitter chain for each antenna and the one transmitter chain for each antenna is only capable of transmitting SRS on a single carrier.
  • the carriers of the aggregated bands may be separated and close in frequency. In particular when the carrier frequencies are close in frequency and do not deviate from each other for e.g. more than 10%, the above described problem of difficult band com- binations does not occur, as the first and second carriers do not influence each other significantly by intermodulation distortion (IMD) of for example 2nd and 3rd order.
  • IMD intermodulation distortion
  • time separated transmission of SRS may be nevertheless re- quired due to the restricted contemporary transmit capability of the terminal de- vice.
  • the uplink signals are uplink reference signals for channel sounding.
  • the amount of downlink traffic is much larger than the amount of uplink traffic.
  • uplink channel sounding may be conducted. This may require to transmit SRS from all antennas of the terminal device in all frequency bands to the base station
  • the base station may configure antenna weights based on the received SRS such that downlink traffic may be optimized.
  • due to the lower amount of uplink traffic it may not be required to transmit uplink traffic from all antennas in all frequency bands.
  • the terminal device may be advantageous to reduce the number of transmitter chains or to reduce the capabilities of the transmitter chains in the terminal device.
  • the required uplink SRS transmissions may nevertheless be conducted based on the time-frequency resources allocated for the uplink SRS transmissions taking into account the contemporaneous trans- mit capabilities of the terminal device.
  • the plurality of uplink signals are transmitted by at least one an- tenna of the terminal device using the at least one transmitter chain.
  • at least some of the uplink signals may be transmitted subsequently, which means in a non-time-overlapping manner, using the at least one transmitter chain.
  • Configuration of the transmitter chain may be changed from a transmission of one uplink signal to a transmission of a next uplink signal following the one uplink signal.
  • downlink scheduling information indicative of the time-fre- quency resources is communicated.
  • the base station may deter- mine and transmit in response to receiving the uplink control message the down- link scheduling information.
  • the time-frequency resources may be selected from a plurality of candidate resources depending on the uplink control message.
  • the plurality of candidate resources may comprise a predefined set of resources, for example a set of resources for the transmission of SRS.
  • the base station may select time- frequency resources which are not overlapping in time such that the required channel sounding may be conducted in timely sequential manner.
  • the contemporaneous transmit capability is associated with hardware limitations of a power amplifier of the at least one transmitter chain. For example, a frequency bandwidth of the power amplifier may be limited, such that only a few carriers or only one carrier may be amplified and transmitted by the power amplifier at the same time.
  • the network may be a 3GPP-stand- ardized network such as 3G, 4G, or upcoming 5G NR.
  • Other examples include point-to-point networks such as Institute of Electrical and Electronics Engineers (lEEE)-specified networks, e.g., the 802.11x Wi-Fi protocol or the Bluetooth pro- tocol.
  • LEEE Institute of Electrical and Electronics Engineers
  • Further examples include 3GPP NB-IOT or eMTC networks.
  • the network 100 includes a base station BS 101 and a user equipment UE 102.
  • the user equipment 102 may comprise for example a terminal device, for exam- pie a mobile telephone, a notebook, an Internet of Things (loT) device, or a Ma- chine Type Communication (MTC) device.
  • a wireless link 111 is established be- tween the BS 101 - e.g., an eNB in a 3GPP LTE framework or a gNB in the 3GPP NR framework - and the UE 102.
  • the wireless link 111 includes a downlink (DL) wireless link from the BS 101 to the UE 102; and further includes an uplink (UL) wireless link from the UE 102 to the BS 101.
  • DL downlink
  • UL uplink
  • Time-division duplexing (TDD), fre- quency-division duplexing (FDD), and/or code-division duplexing (CDD) may be employed for mitigating interference between UL and DL.
  • TDD, FDD, CDD and/or spatial division duplexing (SDD) may be employed for mitigating in- terference between multiple UEs communicating on the wireless link 111 (not shown in FIG. 1 ).
  • the UE 102 may be one of the following: a smartphone; a cellular phone; a tablet; a notebook; a computer; a CPE; a smart TV; an MTC device; an eMTC device; an loT device; an NB-loT device; a sensor; an actuator; etc.
  • FIG. 2 schematically illustrates the BS 101 and the UE 102 in greater detail.
  • the BS 101 includes a processor 1011 and an interface 1012, sometimes also re- ferred to as frontend.
  • the interface 1012 is coupled via antenna ports (not shown in FIG. 2) with an antenna patch 1013 including a plurality of antennas 1014.
  • the antenna patch 1013 may include at least 30 antennas 1014, optionally at least 110 antennas, further optionally at least 200 antennas.
  • Antenna panels are sometimes also referred to as antenna patch.
  • a scenario implementing a large number of antennas 1014 is referred to as full dimension multi-input multi-output (FD-MIMO) or massive multi-input multiple-output (Mas- sive MIMO, MaMi).
  • the BS 101 further includes a memory 1015, e.g., a non-volatile memory.
  • the memory may store program code that can be executed by the processor 1011. Executing the program code may cause the processor 1011 to perform tech- niques with respect to communicating one or more downlink signals, and remote controlling UE management as disclosed herein.
  • the processor 1011 and the memory 1015 form a control circuit.
  • the BS 101 may include a plurality of base stations to which the UE 102 is connected.
  • the UE 102 may be connected to a base station operating according to LTE and additionally the UE 102 may be connected to a base station operating according to 5G-NR.
  • the BS 101 may represent the LTE base station and the 5G-NR the base station to which the UE 102 is communicating.
  • the UE 102 includes a processor 1021 and an interface 1022, sometimes also referred to as frontend.
  • the interface 1022 is coupled via antenna ports (not shown in FIG.
  • the antenna patch 1023 may include at least 6 anten- nas, optionally at least 16 antennas.
  • the antenna patch 1023 of the UE 102 may include fewer antennas 1024 than the antenna patch 1013 of the BS 101.
  • the UE 102 further includes a memory 1025, e.g., a non-volatile memory.
  • the memory 1025 may store program code that can be executed by the processor 1021. Executing the program code may cause the processor 1021 to perform techniques with respect to communicating one or more uplink signals, for exam- pie uplink pilot signals (e.g. SRS), and radio resource management as described herein.
  • the processor 1021 and the memory 1025 form a control circuit.
  • FIG. 2 also illustrates aspects with respect to propagation channels 151.
  • FIG. 2 schematically illustrates that different propagation channels 151 (dashed lines in FIG. 2) are implemented on the wireless link 111.
  • the different propagation chan- nels 151 are associated with different beams 401 , 411 (in FIG. 2, for sake of simplicity, only a single beam 401 implemented by the UE 102 and a single beam 411 implemented by the UE 108 are illustrated).
  • a certain DL transmit beam may be selected for the antenna patch 1013 of the BS 101.
  • the beam may generally be implemented by certain values of the antenna weights of the antennas 1014, 1024 / antenna ports of the respective antenna patch 1013, 1023.
  • the antenna weights are also referred to as steering vectors or pre- coding parameters.
  • different beams 401 may be addressed by using different amplitude and phase configurations for the various antennas 1014, 1024 / antenna ports of the respective antenna patches 1013, 1023, i.e., different val- ues for the antenna weights. While in FIG. 2 line-of-sight propagation channels 151 are illustrated, in other examples, non-line-of-sight propagation channels 151 are possible.
  • Different ones of the propagation channels 151 may have different transmission characteristics such as number of reflections, path loss, and generally transmis- sion reliability and/or capacity.
  • different propagation channels 151 can have different fading profiles at the position of the respective receiver. Fading typically occurs due to destructive interference of reflected electromagnetic waves carrying the signals at the position of the receiver. Thus, the link perfor- mance will vary significantly depending on the selected beam 401 / propagation channel 151.
  • appropriate propagation channels 151 - by determining the appropriate values for the antenna weights -, diversity can be provided to reduce fading. According to various examples described herein, selection of the appropriate values for the antenna weights is facilitated through channel sound- ing.
  • one or more pilot signals 152 can be transmitted and received.
  • pilot signals as described herein may generally have a well-defined symbol sequence and/or transmission power such that based on a receive property of the pilot signals it is possible to sound the wireless link.
  • the pilot signals may also be referred to as sounding reference signals (SRS) or synchro- nization signals.
  • the pilot signals may be indicative of the beam 401 , 411 on which they are transmitted.
  • FIG. 3 shows frequency bands 301 , 302, which may be defined in LTE or 5G-NR communication frameworks for the wireless link 111.
  • the frequency bands 301 , 302 may be arranged in frequencies below 1 GFIz, or in frequencies between 1 GFIz and 3 GFIz, or in frequencies between 3 GFIz and 6 GFIz.
  • a bandwidth of each of the bands may comprise several 10 MFIz up to several 100 MFIz.
  • a bandgap 305 between two bands may be provided for separating the bands 301 , 302.
  • each carrier 321 to 323 may have a corresponding center fre- quency of 311 to 313 and each carrier 321 to 323 may comprise a plurality of subcarriers illustrated by the vertical lines within each carrier 321 to 323 in FIG. 3.
  • a bandwidth of each carrier 321 to 323 may be in a range of 1 MFIz to 20 MFIz.
  • the number of subcarriers within each carrier 321 to 323 may be in the range of several tens to several hundreds subcarriers. For example, in LTE, a frequency spacing between two subcarriers is 15 kFIz.
  • 2nd order and 3rd order IMD may occur at certain subcarriers, although center frequencies of carriers are largely spaced apart, for example when the center frequency of the first carrier is below 1 GFIz and a center frequency of a second carrier is in the range of 1.7 GFIz to 2.7 GFIz.
  • Such band combinations may be categorized as difficult.
  • frequency space 316 between center frequency 311 and center frequency 313, and frequency space 317 between center frequency 312 and center frequency 313 may represent such difficult combinations.
  • simultaneous or contemporaneous transmissions may in- fluence each other, at least in certain subcarriers. Corresponding precautions should be taken as discussed in 3GPP TR 37.863-02-01 , for example avoiding contemporaneous transmission of SRS in such difficult combinations.
  • FIG. 4 shows a schematic definition of resources 161 in a frame 160.
  • the frame
  • the 160 may comprise a plurality of subcarriers of different frequency as indicated by the lines of the frame 160. Furthermore, the frame 160 may comprise a plurality of time slots indicated by the columns of the frame 160. Thus, a single resource
  • the two hatched re- sources in FIG. 4 represent resources, which are separated in time and represent therefore non-time-overlapping resources.
  • FIG. 5 is a flowchart of a method according to various examples.
  • the method according to FIG.5 may be executed by the control circuitry 1011 , 1015 of the BS 101 ; and/or may be executed by the control circuitry 1021 , 1025 of the UE 102.
  • optional elements are indicated using dashed lines.
  • an uplink control message is communicated between a base sta- tion of a network and a user equipment.
  • the uplink control message is transmitted from the user equipment 102 to the base station 101.
  • the uplink control message indicates the contemporaneous transmit capability of at least one transmitter chain of the user equipment 102 on a plurality of carriers.
  • the uplink control message may indicate that at least one transmitter chain is not able to contemporaneously transmit uplink pilot signals on a first car- rier and a second carrier of the plurality of carriers.
  • the base station 101 may select time-frequency resources in accordance with the received contemporaneous transmit capability. For exam- pie, the base station 101 may select time-frequency resources which do not over- lap in time. For example, the base station 101 may select a time-frequency re- source in a first carrier, for example in carrier 321 , and the base station may select a time frequency resource in a second carrier, for example in carrier 322. Flow- ever, due to limited transmit capabilities of the user equipment 102, the user equipment 102 may have indicated in the uplink control message that a contem- poraneous transmission in the first carrier 321 and the second carrier 322 is not possible.
  • the base station may select the time-frequency resources such that the time-frequency resource in the first carrier 321 for transmitting, for example SRS for channel sounding the first carrier 321 , does not timely overlap with the time-frequency resource in the second carrier 322, for transmitting for example SRS for channel sounding the second carrier 322.
  • downlink scheduling information may be communicated from the base station 101 to the user equipment 102.
  • the downlink scheduling information may include the time-frequency resources selected at block 8002.
  • uplink signals for example SRS for channel sounding the first car- rier 321 and SRS for channel sounding the second carrier 302, are communicated in the time-frequency resources allocated on the plurality of carriers scheduled in accordance with the contemporaneous transmit capability.
  • the up- link signals may be transmitted from the user equipment 102 to the base station 101.
  • the user equipment 102 may first transmit SRS for channel sounding the first carrier 321 and after that the user equipment 102 may transmit SRS for channel sounding the second carrier 322.
  • the SRS may be received at the base station 101 and the base station 101 may determine values of antenna weights for future downlink trans- missions, for example according to MIMO techniques.
  • FIG. 6 illustrates signaling associated with resource allocation and uplink signal communication according to various examples.
  • the signalling ac- cording to FIG. 6 may illustrate a communication between the base station 101 and the user equipment 102.
  • the user equipment 102 transmits an uplink control message, which in- dicates a contemporaneous transmit capability 4001 of at least one transmitter chain of the user equipment on the plurality of carriers.
  • the uplink control message may indicate that at least one transmitter chain is not able to contemporaneously transmit uplink pilot signals on a first carrier and a second carrier of the plurality of carriers.
  • the base station 101 may select time- frequency resources in accordance with the contemporaneous transmit capabil- ity. For example, the base station 101 may select time-frequency resources for the first carrier and the second carrier which do not overlap in time. For example, the base station 101 may select a time-frequency resource on a first carrier, for example on carrier 321 , and the base station may select a time frequency re- source on a second carrier, for example on carrier 322. The time-frequency re- sources are selected such that the time-frequency resource on the first carrier 321 does not timely overlap with the time-frequency resource on the second car- rier 322.
  • downlink scheduling information 4002 may be communicated from the base station 101 to the user equipment 102.
  • the downlink schedul- ing information 4002 may include the time-frequency resources selected as de- scribed above.
  • an uplink pilot signal 4003 for example SRS for channel sounding the first carrier 321 , is transmitted via each antenna of the user equipment 102 ac- cording to the selected time-frequency resources for the first carrier 321.
  • the user equipment 102 may comprise two antennas and therefore, as indicated by the two arrows in figure 6, two uplink pilot signals 4003 are transmit- ted in the first carrier 321.
  • the two uplink pilot signals 4003 may be transmitted at the same time or subsequently.
  • the user equipment 102 may reconfigure the transmitter chain after transmitting the first pilot signal.
  • Corresponding time-frequency resources for transmitting the two uplink pilot sig nals 4003 simultaneously or subsequently were provided by the base station 101 in the scheduling information 4002.
  • the user equipment 102 reconfigures the transmitter chain of the user equipment 102 for communication in the second carrier 322. For example, filters in the transmitter chain may be switched.
  • a further uplink pilot signal 4004 for example SRS for channel sounding the second carrier 322, is transmitted via each antenna of the user equipment 102 according to the selected time-frequency resources for the second carrier 322.
  • the user equipment 102 may comprise two antennas and therefore, as indicated by the two arrows in figure 6, two uplink pilot signals 4004 are transmitted in the second carrier 322.
  • the pilot signal 4003 and the further pilot signal 4004 may be received at the base station 101 and the base station 101 may determine values of antenna weights for future downlink transmissions, for example according to MIMO tech- niques.
  • the user equipment may have restricted capabilities to transmit uplink signals at the same time from each antenna, or the user equip- ment may have restricted capabilities to transmit uplink signals in different carri- ers at the same time.
  • the user equipment may provide a number of receiver chains as required for simultaneous signal receptions on each an- tenna and in each supported band such that MIMO downlink communication may be supported in each band, the user equipment may provide a lower number of transmitter chains than required for simultaneous signal transmissions on each antenna and in each supported band.
  • FIG. 7 schematically shows receiver and transmitter chains of the user equipment 102.
  • the user equipment 102 comprises two antennas, such as a first antenna 701 and a second antenna 702.
  • the user equipment 102 comprises a single power amplifier 710 and two bandpass filters, such as a first bandpass filter 712 and a second band- pass filter 713.
  • the power amplifier 710 may be selectively coupled via a switch 711 to inputs of the first bandpass filter 712 and the second bandpass filter 713.
  • a further switch 730 enables coupling of outputs of the first bandpass filter 712 and the second bandpass filter 713 to the first antenna 701 and the second an- tenna 702.
  • the first bandpass filter 712 may have a first passband and the sec- ond bandpass filter 713 may have a second passband which is different from the first passband.
  • the transmitter chain comprising the power amplifier 710, the first bandpass filter 712 and the second bandpass filter 713 may be restricted to transmit uplink signals on a single antenna only, either the first antenna 701 or the second antenna 702, in a single frequency band only, either within the first passband or within the second passband.
  • the user equipment 102 shown in figure 7 may comprise four receiver chains, a first receiver chain comprising bandpass filter 724 and receive amplifier 720, a second receiver chain comprising bandpass filter 725 and receive amplifier
  • a third receiver chain comprising bandpass filter 726 and receive amplifier
  • bandpass filter 724 and bandpass filter 725 may be coupled to an- tenna 701 via the switch 730, and bandpass filter 726 and bandpass filter 727 may be coupled to antenna 702 via the switch 730.
  • Bandpass filter 724 and band- pass filter 726 may have a first passband and bandpass filter 725 and bandpass filter 727 may have a second passband which is different from the first passband.
  • the thus configured receiver chains may provide a contemporaneous receive ca- pability of downlink signals in both the first passband and the second passband at both the first antenna and the second antenna.
  • a first downlink signal having a frequency within the first passband and being received simulta- neously at the first antenna 701 and the second antenna 702 may be provided at the outputs of the receive amplifier 720 and the receive amplifier 722 and pro- Consed by the user equipment 102, for example according to MIMO technologies.
  • a second downlink signal having a frequency within the second passband and being received simultaneously at the first antenna 701 and the second antenna 702 may be provided at the outputs of the receive amplifier 721 and the receive amplifier 723 and may be processed by the user equipment 102, for example according to MIMO technologies.
  • the transmitter chain of the user equipment 102 described in FIG. 7 is re- stricted to transmit uplink signals on only one of the first antenna 701 and the second antenna 702 and having a frequency within only one of the first passband and the second passband.
  • user equipment 102 may communicate an uplink control message to the base station 101 which indicates this contem- poraneous transmit capability of the transmitter chain.
  • the contem- poraneous transmit capability may indicate all allowed combinations of antennas which can be simultaneously coupled to the power amplifier of the transmitter chain.
  • the contemporaneous transmit capability may for example indicate all allowed combinations of frequency ranges or carriers on which signals can be simultaneously transmitted by the transmitter chain.
  • the contemporaneous transmit capability may indicate all allowed com- binations of combinations of antennas in combination with combinations of fre- quency ranges or carriers supported by the transmitter chain.

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

Abstract

L'invention concerne un procédé consistant à communiquer un message de commande de liaison montante d'un terminal (102) à une station de base (101), le message de commande de liaison montante indiquant une capacité de transmission simultanée d'au moins une chaîne d'émetteurs du terminal sur une pluralité de porteuses (321, 322, 323), et à communiquer des signaux de liaison montante dans des ressources temps-fréquence attribuées sur la pluralité de porteuses et ordonnancés conformément à la capacité de transmission simultanée.
PCT/EP2019/051467 2018-01-22 2019-01-22 Communication de signaux de liaison montante WO2019141866A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1830025-1 2018-01-22
SE1830025 2018-01-22

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WO2019141866A1 true WO2019141866A1 (fr) 2019-07-25

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CN114245431A (zh) * 2020-09-09 2022-03-25 中国电信股份有限公司 发射机切换方法及相关设备

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EP2542007A1 (fr) * 2010-02-26 2013-01-02 Sharp Kabushiki Kaisha Dispositif de station mobile, dispositif de station de base, système de communications sans fil, procédé de régulation de communications, programme de régulation de communications et processeur
EP2725861A1 (fr) * 2011-06-21 2014-04-30 Sharp Kabushiki Kaisha Dispositif de station mobile, dispositif de station de base, système de communication, procédé de notification de capacité de dispositif de station mobile et circuit intégré
US20160270139A1 (en) * 2014-05-16 2016-09-15 Telefonaktiebolaget L M Ericsson (Publ) Determination of UE Band and Synchronization Capability in Dual Connectivity
US20170302419A1 (en) * 2016-04-01 2017-10-19 Futurewei Technologies, Inc. System and Method for SRS Switching, Transmission, and Enhancements

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2542007A1 (fr) * 2010-02-26 2013-01-02 Sharp Kabushiki Kaisha Dispositif de station mobile, dispositif de station de base, système de communications sans fil, procédé de régulation de communications, programme de régulation de communications et processeur
EP2725861A1 (fr) * 2011-06-21 2014-04-30 Sharp Kabushiki Kaisha Dispositif de station mobile, dispositif de station de base, système de communication, procédé de notification de capacité de dispositif de station mobile et circuit intégré
US20160270139A1 (en) * 2014-05-16 2016-09-15 Telefonaktiebolaget L M Ericsson (Publ) Determination of UE Band and Synchronization Capability in Dual Connectivity
US20170302419A1 (en) * 2016-04-01 2017-10-19 Futurewei Technologies, Inc. System and Method for SRS Switching, Transmission, and Enhancements

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114245431A (zh) * 2020-09-09 2022-03-25 中国电信股份有限公司 发射机切换方法及相关设备
CN114245431B (zh) * 2020-09-09 2023-11-07 中国电信股份有限公司 发射机切换方法及相关设备

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