Patent Application
20250142518
The present disclosure generally relates to the field of communications. more specifically, the present disclosure relates to method and apparatus for measuring positioning reference signal in a wireless communication system.
5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in “Sub 6 GHZ” bands such as 3.5 GHZ, but also in “Above 6 GHZ” bands referred to as mmWave including 28 GHZ and 39 GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz (THz) bands (for example, 95 GHz to 3 THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.
At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.
Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.
Moreover, there has been ongoing standardization in air interface architecture/protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture/service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.
As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with extended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.
Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.
The present disclosure relates to wireless communication systems and, more specifically, the present disclosure relates to method and apparatus for performing a receiver in a wireless communication system.
According to one aspect of the present disclosure, there is provided a method performed by a receiver in a wireless communication system. The method may include acquiring configuration information of a reference signal for positioning, performing a carrier phase-based positioning measurement based on the configuration information, and reporting and/or transmitting a result of the carrier phase-based positioning measurement.
In one embodiment, in the above-described method performed by the receiver: in a case where a condition for enabling the carrier phase-based positioning measurement is satisfied, the carrier phase-based positioning measurement may be performed.
In one embodiment, in the above-described method performed by the receiver, the condition may include a combination of one or more of items below: a difference value between reference signal receiving power RSRPs of a strongest path and a second path of the reference signal for positioning received by the receiver is greater than a first threshold value; the reference signal for positioning received by the receiver has N paths whose RSRP values are greater than a second threshold value, wherein, N is an integer greater than or equal to 1; a Light of Sight/Non-Light of Sight (LOS/NLOS) indication signal is a hard value and the value is 1 or true, and/or the LOS/NLOS indication signal is a soft value and the value is greater than a fourth threshold value; and a multipath indication signal indicates that the reference signal for positioning is a single-path signal.
In one embodiment, in the above-described method performed by the receiver, when a second condition is satisfied, the multipath indication signal indicates that the reference signal for positioning is a single-path signal, and the second condition may include a combination of one or more of items below: a difference value between reference signal receiving power RSRPs of a strongest path and a second path of the reference signal for positioning received by the receiver is greater than a first threshold value; the reference signal for positioning received by the receiver has N paths whose RSRP values are greater than a second threshold value, wherein, N is an integer greater than or equal to 1; an LOS/NLOS indication signal is a hard value and the value is 1 or true, and/or the LOS/NLOS indication signal is a soft value and the value is greater than a fourth threshold value.
In one embodiment, the above-described method performed by the receiver may further include: transmitting, to a transmitter, first assistance information, which is used for configuring the reference signal for positioning.
In one embodiment, the above-described method performed by the receiver may further include: keeping synchronization with a clock of the transmitter.
In one embodiment, in the above-described method performed by the receiver, the keeping synchronization with the clock of the transmitter may include a combination of one or more of items below: keeping synchronization with the clock of the transmitter according to a clock of an absolute time source, and keeping synchronization with the clock of the transmitter through a clock synchronization timestamp.
In one embodiment, in the above-described method performed by the receiver, the first assistance information may include at least one of a subcarrier spacing of reference signal for positioning, a time-frequency resource location of reference signal for positioning, a port and a bandwidth of reference signal for positioning, a transmission period of reference signal for positioning, a duration of reference signal for positioning, a start point of reference signal for positioning, a repetition period and a muting mechanism of reference signal for positioning.
In one embodiment, in the above-described method performed by the receiver, the keeping synchronization with the clock of the transmitter through the clock synchronization timestamp may include: receiving the clock synchronization timestamp configured by the transmitter, wherein, the clock synchronization timestamp may include: a transmission time associated with an identity ID of a specific reference signal for positioning; and the receiver may use a difference value between the transmission time in the received clock synchronization timestamp and a local reception time of the reference signal associated with the identity ID of the specific reference signal for positioning as transmission time of the reference signal for positioning, to complete synchronization with the transmitter.
In one embodiment, in the above-described method performed by the receiver, when the first condition is satisfied, the clocks of the transmitter and the receiver are to be kept synchronized.
In one embodiment, in the above-described method performed by the receiver, the first condition may be that a positioning accuracy is less than a fifth threshold value and/or the RSRP of the reference signal for positioning received by the receiver is less than a sixth threshold value.
In one embodiment, the above-described method performed by the receiver may further include: compensating for a residual carrier phase shift.
In one embodiment, in the above-described method performed by the receiver, the compensating for the residual carrier phase shift may include a combination of one or more of items below: when performing the carrier phase-based positioning measurement through a single carrier and/or multiple carriers, the receiver may receive the reference signal for positioning through P consecutive OFDM symbols, and/or may receive the reference signal for positioning through an OFDM symbol group, wherein, the OFDM symbol group may include consecutive OFDM symbols; the receiver may separate the residual carrier phase shift by means of frequency hopping; the receiver may receive the reference signal for positioning q times, and compensate for the residual carrier phase shift by statistical means, wherein, q is an integer greater than or equal to 1.
In one embodiment, in the above-described method performed by the receiver, when a transmission time gap of the reference signal for positioning is less than a seventh threshold value and/or when a positioning measurement accuracy requirement is satisfied, the receiver may receive the reference signal for positioning q times.
In one embodiment, in the above-described method performed by the receiver, the reported and/or transmitted result of carrier phase-based positioning measurement may include at least one of items below: a carrier phase measurement result, a reference signal time difference RSTD.
In one embodiment, in the above-described method performed by the receiver, the carrier phase measurement result may include at least one of items below: an integer part carrier phase difference between the receiver and the transmitter, a fractional part carrier phase difference between the receiver and the transmitter, an integer part carrier phase difference between a current carrier phase measurement and a last carrier phase measurement, and a fractional part carrier phase difference between the current carrier phase measurement and the last carrier phase measurement.
In one embodiment, in the above-described method performed by the receiver, when no phase jumping is detected and/or the RSRP value of the received reference signal for positioning is greater than or equal to an eighth threshold value and/or a positioning accuracy is greater than or equal to a ninth threshold value, the carrier phase measurement result may include the integer part carrier phase difference and/or the fractional part carrier phase difference between the current carrier phase measurement and the last carrier phase measurement; or when a phase jumping is detected and/or the RSRP value of the received reference signal for positioning is less than the eighth threshold value and/or the positioning accuracy is less than the ninth threshold value, the carrier phase measurement result may include the integer part carrier phase difference and/or the fractional part carrier phase difference between the receiver and the transmitter.
In one embodiment, in the above-described method performed by the receiver, the RSTD may be obtained according to the carrier phase difference measured by using the carrier phase-based positioning measurement method and/or obtained through a result based on the Time Difference of Arrival TDOA measurement method that is corrected by a result of the carrier phase-based positioning measurement method.
In one embodiment, in the above-described method performed by the receiver, at least one threshold value of the first threshold value, the second threshold value, the fourth threshold value, the fifth threshold value, the sixth threshold value, the seventh threshold value, the eighth threshold value, and the ninth threshold value may be a value determined by a user equipment UE and/or a value configured by the base station.
In one embodiment, in the above-described method performed by the receiver, the configuration information of the reference signal for positioning may be specific configuration information of a reference signal for carrier phase positioning.
In one embodiment, in the above-described method performed by the receiver, in a case where the reference signal for positioning is transmitted by using a timing advance method, the RSTD may be determined based on a timing advance time and a clock offset error between the receiver and the transmitter; or in a case where the reference signal for positioning is not transmitted by using the timing advance method, the RSTD may be determined based on the clock offset error between the receiver and the transmitter.
In one embodiment, in the above-described method performed by the receiver, the strongest path may be a first arrival path and/or a first detection path of the reference signal for positioning in time and/or a path of the reference signal for positioning whose RSRP value is the largest.
In one embodiment, in the above-described method performed by the receiver, the second path may be a second arrival path and/or a second detection path of the reference signal for positioning in time and/or a path of the reference signal for positioning whose RSRP value is the next largest.
According to another aspect of the present disclosure, there is further provided a method performed by a transmitter in a communication system. The method may include: configuring a reference signal for positioning and/or determining a reference signal for positioning according to configuration information; transmitting, to a receiver, configuration information of the reference signal for positioning, and/or transmitting, to the receiver, the reference signal for positioning; and receiving, from the receiver, a result of a carrier phase-based positioning measurement.
In one embodiment, in the above-described method performed by the transmitter, the reference signal for positioning may be configured and/or determined according to first assistance information received from the receiver; and/or a spacing of the reference signal for positioning in a frequency domain may be calculated according to a coverage range of the transmitter; and/or the reference signal for positioning may be transmitted by using a timing advance method or not by using a timing advance method.
In one embodiment, in the above-described method performed by the transmitter, the receiver may be a user equipment UE, a base station, a location management function LMF, or a sidelink device; and/or the transmitter may be a user equipment UE, a base station, a location management function LMF, or a sidelink device.
According to another aspect of the present disclosure, there is provided a transmitter device. The transmitter device may include a transceiver; and a processor, coupled to the transceiver and configured to perform any one of the above-described methods performed by the transmitter.
According to another aspect of the present disclosure, there is provided a receiver device. The receiver device may include: a transceiver; and a processor, coupled to the transceiver and configured to perform any one of the above-described methods performed by the receiver.
According to another aspect of the present disclosure, there is further provided a non-transitory computer-readable medium, having instructions stored thereon, and when the instructions are executed by a processor, causing the processor to perform the above-described methods.
Aspects of the present disclosure provide efficient communication methods in a wireless communication system.
Accordingly, the embodiment herein is to provide a method performed by a receiver in a wireless communication system. The method includes acquiring configuration information of a reference signal for positioning. Further, the method includes performing a carrier phase-based positioning measurement based on the configuration information. Further, the method includes reporting and/or transmitting a result of the carrier phase-based positioning measurement.
In an embodiment, in a case where a condition for enabling the carrier phase-based positioning measurement is satisfied, the carrier phase-based positioning measurement is performed.
In an embodiment, the condition comprises a combination of one or more of items below: a difference value between reference signal receiving power RSRPs of a strongest path and a second path of the reference signal for positioning received by the receiver is greater than a first threshold value, the reference signal for positioning received by the receiver has N paths whose RSRP values are greater than a second threshold value, wherein, N is an integer greater than or equal to 1, a Light of Sight/Non-Light of Sight indication signal is a hard value and the value is 1 or true, and/or the Light of Sight/Non-Light of Sight indication signal is a soft value and the value is greater than a fourth threshold value, and a multipath indication signal indicates that the reference signal for positioning is a single-path signal.
In an embodiment, when a second condition is satisfied, the multipath indication signal indicates that the reference signal for positioning is a single-path signal. Further, the second condition comprises a combination of one or more of items below: a difference value between reference signal receiving power RSRPs of the strongest path and the second path of the reference signal for positioning received by the receiver is greater than the first threshold value, the reference signal for positioning received by the receiver has N paths whose RSRP values are greater than the second threshold value, wherein, N is an integer greater than or equal to 1, and the Light of Sight/Non-Light of Sight indication signal is a hard value and the value is 1 or true, and/or the Light of Sight/Non-Light of Sight indication signal is a soft value and the value is greater than the fourth threshold value.
In an embodiment, the receiver further includes keeping synchronization with a clock of a transmitter.
In an embodiment, the keeping synchronization with the clock of the transmitter comprises a combination of one or more of items below: keeping synchronization with the clock of the transmitter according to a clock of an absolute time source and keeping synchronization with the clock of the transmitter through a clock synchronization timestamp.
In an embodiment, the receiver further includes compensating for a residual carrier phase shift.
In an embodiment, the compensating for the residual carrier phase shift comprises a combination of one or more of items below: when performing the carrier phase-based positioning measurement through a single carrier and/or multiple carriers, the receiver receives the reference signal for positioning through P consecutive OFDM symbols, and/or receives the reference signal for positioning through an OFDM symbol group, wherein, the OFDM symbol group comprises consecutive OFDM symbols, the receiver separates the residual carrier phase shift by means of frequency hopping, and the receiver receives the reference signal for positionig q times, and compensates for the residual carrier phase shift by statistical means, wherein, q is an integer greater than or equal to 1.
In an embodiment, when a transmission time gap of the reference signal for positioning is less than a seventh threshold value and/or when a positioning measurement accuracy requirement is satisfied, the receiver receives the reference signal for positioning q times.
In an embodiment, the reported and/or transmitted result of the carrier phase-based positioning measurement comprises at least one of items below: a carrier phase measurement result and a reference signal time difference RSTD.
In an embodiment, the carrier phase measurement result comprises at least one of items below: an integer part carrier phase difference between the receiver and the transmitter, a fractional part carrier phase difference between the receiver and the transmitter, an integer part carrier phase difference between a current carrier phase measurement and a last carrier phase measurement, and a fractional part carrier phase difference between the current carrier phase measurement and the last carrier phase measurement.
In an embodiment, when no phase jumping is detected and/or a RSRP value of the received reference signal for positioning is greater than or equal to an eighth threshold value and/or a positioning accuracy is greater than or equal to a ninth threshold value, the carrier phase measurement result comprises the integer part carrier phase difference and/or the fractional part carrier phase difference between the current carrier phase measurement and the last carrier phase measurement, or when phase jumping is detected and/or the RSRP value of the received reference signal for positioning is less than the eighth threshold value and/or the positioning accuracy is less than the ninth threshold value, the carrier phase measurement result comprises the integer part carrier phase difference and/or the fractional part carrier phase difference between the receiver and the transmitter.
In an embodiment, the RSTD is obtained according to the carrier phase difference measured by using the carrier phase-based positioning measurement method, and/or obtained through a result based on the Time Difference of Arrival TDOA measurement method that is corrected by a result of the carrier phase-based positioning measurement method.
In an embodiment, the configuration information of the reference signal for positioning is specific configuration information of a reference signal for carrier phase positioning.
In an embodiment, in a case where the reference signal for positioning is transmitted by using a timing advance method, the RSTD is determined based on a timing advance time and a clock offset error between the receiver and the transmitter, or in a case where the reference signal for positioning is not transmitted by using the timing advance method, the RSTD is determined based on the clock offset error between the receiver and the transmitter.
Accordingly, the embodiment herein is to provide a method performed by a transmitter in a communication system. The method includes configuring a reference signal for positioning and/or determining the reference signal for positioning according to configuration information. Further, the method includes transmitting, to a receiver, configuration information of the reference signal for positioning, and/or transmitting, to the receiver, the reference signal for positioning. Further, the method includes receiving, from the receiver, a result of a carrier phase-based positioning measurement.
In an embodiment, the reference signal for positioning is configured and/or determined according to first assistance information received from the receiver, and/or a spacing of the reference signal for positioning in a frequency domain is calculated according to a coverage range of the transmitter, and/or the reference signal for positioning is transmitted by using a timing advance method or not by using the timing advance method.
In an embodiment, the receiver is a user equipment UE, a base station, a location management function LMF, or a sidelink device and/or the transmitter is a UE, a base station, an LMF, or a sidelink device.
Accordingly, the embodiment herein is to provide a transmitter device or a receiver device. The transmitter device or the receiver device include a transceiver and a processor, coupled to the transceiver and configured to perform the method.
The following description with reference to the accompanying drawings is provided to facilitate comprehensive understanding of various embodiments of the present disclosure as defined by the claims and equivalents thereof. The description includes various specific details to facilitate understanding, but should be considered exemplary only. Therefore, those ordinarily skilled in the art will recognize that, various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for clarity and conciseness, description of well-known functions and structures may be omitted.
The terms and wordings used in the following description and claims are not limited to their dictionary meaning, but are merely used by an inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that, the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the scope of the present disclosure as defined by the appended claims and equivalents thereof.
It should be understood that, the singular forms of “a”, “an” and “the” include plural references unless the context clearly dictates otherwise. Thus, for example, a reference to a “component surface” includes a reference to one or more such surfaces.
The terms “include” or “may include” refer to presence of a correspondingly disclosed function, operation, or component that may be used in various embodiments of the present disclosure, rather than limiting presence of one or more additional functions, operations, or features. Furthermore, the terms “comprise” or “have” may be construed to indicate certain characteristics, numbers, steps, operations, constituent elements, components, or combinations thereof, but should not be construed as excluding possibility of presence of one or more other characteristics, numbers, steps, operations, constituent elements, components, or combinations thereof.
The term “or” as used in various embodiments of the present disclosure includes any of the listed terms and all combinations thereof. For example, “A or B” may include A, or may include B, or may include both A and B.
Unless defined differently, all terms (including technical or scientific terms) used in the present disclosure have the same meaning as understood by those ordinarily skilled in the art according to the present disclosure. Common terms as defined in dictionaries are to be construed to have meanings consistent with the context in the relevant technical field, and should not be construed ideally or overly formalized unless explicitly so defined in the present disclosure.
The technical solutions of the embodiments of the present disclosure may be applied to various communication systems, for example: Global System for Mobile communications (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide interoperability for Microwave Access (WiMAX) communication system, 5th generation (5G) system or New Radio (NR), etc. In addition, the technical solutions of the embodiments of the present disclosure may be applied to future-oriented communication technologies.
The wireless network 100 includes a gNodeB (gNB) 101, a gNB 102, and a gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data networks.
Depending on a type of the network, other well-known terms such as “base station” or “access point” may be used instead of “gNodeB” or “gNB”. For convenience, the terms “gNodeB” and “gNB” are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. And, depending on the type of the network, other well-known terms such as “mobile station”, “user station”, “remote terminal”, “wireless terminal” or “user apparatus” may be used instead of “user equipment” or “UE”. For convenience, the terms “user equipment” and “UE” are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, no matter whether the UE is a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or a vending machine).
gNB 102 provides wireless broadband access to the network 130 for a first plurality of User Equipments (UEs) within a coverage area 120 of gNB 102. The first plurality of UEs include a UE 111, which may be located in a Small Business (SB); a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within a coverage area 125 of gNB 103. The second plurality of UEs include a UE 115 and a UE 116. In some embodiments, one or more of gNBs 101 through 103 can communicate with each other and with UEs 111 through 116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX or other advanced wireless communication technologies.
The dashed lines show approximate ranges of the coverage areas 120 and 125, and the ranges are shown as approximate circles merely for illustration and explanation purposes. It should be clearly understood that the coverage areas associated with the gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on configurations of the gNBs and changes in the radio environment associated with natural obstacles and man-made obstacles.
As will be described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems with 2D antenna arrays.
Although
The transmission path 200 includes a channel coding and modulation block 205, a Serial-to-Parallel (S-to-P) block 210, a size N Inverse Fast Fourier Transform (IFFT) block 215, a Parallel-to-Serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230.
In the transmission path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as Low Density Parity Check (LDPC) coding), and modulates the input bits (such as using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. The Serial-to-Parallel (S-to-P) block 210 converts (such as demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is a size of the IFFT/FFT used in gNB 102 and UE 116. The size N IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. The Parallel-to-Serial block 220 converts (such as multiplexes) parallel time-domain output symbols from the Size N IFFT block 215 to generate a serial time-domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at a baseband before switching to the RF frequency.
The reception path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a Serial-to-Parallel (S-to-P) block 265, a size N Fast Fourier Transform (FFT) block 270, a Parallel-to-Serial (P-to-S) block 275, and a channel decoding and demodulation block 280.
The RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations in reverse to those at gNB 102 are performed at UE 116. The down-converter 255 down-converts the received signal to a baseband frequency, and the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. The Serial-to-Parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. The Size N FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. The Parallel-to-Serial block 275 converts the parallel frequency-domain signal into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.
Each of gNBs 101-103 may implement a transmission path 200 similar to that for transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to that for receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.
Each of the components in
Furthermore, although described as using FFT and IFFT, this is only illustrative and should not be interpreted as limiting the scope of the present disclosure. Other types of transforms can be used, such as Discrete Fourier transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N may be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer which is a power of 2 (such as 1, 2, 4, 8, 16, etc.).
Although
UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a transmission (TX) processing circuit 315, a microphone 320, and a reception (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor/controller 340, an input/output (I/O) interface 345, an input device(s) 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.
The RF transceiver 310 receives an incoming RF signal transmitted by a gNB of the wireless network 100 from the antenna 305. The RF transceiver 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and/or digitizing the baseband or IF signal. The RX processing circuit 325 transmits the processed baseband signal to speaker 330 (such as for voice data) or to processor/controller 340 for further processing (such as for web browsing data).
The TX processing circuit 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, email or interactive video game data) from processor/controller 340. The TX processing circuit 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.
The processor/controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 in order to control the overall operation of UE 116. For example, the processor/controller 340 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceiver 310, the RX processing circuit 325 and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor/controller 340 includes at least one microprocessor or microcontroller.
The processor/controller 340 is also capable of executing other processes and programs residing in the memory 360, such as operations for channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. The processor/controller 340 can move data into or out of the memory 360 as required by an execution process. In some embodiments, the processor/controller 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator. The processor/controller 340 is also coupled to an I/O interface 345, where the I/O interface 345 provides UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. I/O interface 345 is a communication path between these accessories and the processor/controller 340.
The processor/controller 340 is also coupled to the input device(s) 350 and the display 355. An operator of UE 116 can input data into UE 116 using the input device(s) 350. The display 355 may be a liquid crystal display or other display capable of presenting text and/or at least limited graphics (such as from a website). The memory 360 is coupled to the processor/controller 340. A part of the memory 360 can include a random access memory (RAM), while another part of the memory 360 can include a flash memory or other read-only memory (ROM).
Although
As shown in
RF transceivers 372a through 372n receive an incoming RF signal from antennas 370a through 370n, such as a signal transmitted by UEs or other gNBs. RF transceivers 372a through 372n down-convert the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding and/or digitizing the baseband or IF signal. RX processing circuit 376 transmits the processed baseband signal to controller/processor 378 for further processing.
The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email or interactive video game data) from the controller/processor 378. TX processing circuit 374 encodes, multiplexes and/or digitizes outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a through 372n receive the outgoing processed baseband or IF signal from TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a through 370n.
The controller/processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller/processor 378 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceivers 372a through 372n, the RX processing circuit 376 and the TX processing circuit 374 according to well-known principles. The controller/processor 378 can also support additional functions, such as higher-level wireless communication functions. For example, the controller/processor 378 can perform a Blind Interference Sensing (BIS) process such as that performed through a BIS algorithm, and decode a received signal from which an interference signal is subtracted. A controller/processor 378 may support any of a variety of other functions in gNB 102. In some embodiments, the controller/processor 378 includes at least one microprocessor or microcontroller.
The controller/processor 378 is also capable of executing programs and other processes residing in the memory 380, such as a basic OS. The controller/processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, the controller/processor 378 supports communication between entities such as web RTCs. The controller/processor 378 can move data into or out of the memory 380 as required by an execution process.
The controller/processor 378 is also coupled to the backhaul or network interface 382. The backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems through a backhaul connection or through a network. The backhaul or network interface 382 can support communication over any suitable wired or wireless connection(s). For example, when gNB 102 is implemented as a part of a cellular communication system, such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A, the backhaul or network interface 382 can allow gNB 102 to communicate with other gNBs through wired or wireless backhaul connections. When gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow gNB 102 to communicate with a larger network, such as the Internet, through a wired or wireless local area network or through a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.
The memory 380 is coupled to the controller/processor 378. A part of the memory 380 can include an RAM, while another part of the memory 380 can include a flash memory or other ROMs. In certain embodiments, a plurality of instructions, such as the BIS algorithm, are stored in the memory. The plurality of instructions are configured to cause the controller/processor 378 to execute the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.
As will be described in more detail below, the transmission and reception paths of gNB 102 (implemented using RF transceivers 372a through 372n, TX processing circuit 374 and/or RX processing circuit 376) support aggregated communication with FDD cells and TDD cells.
Although
A time domain unit (also referred to as a time unit) in the present disclosure may be: one OFDM symbol, one OFDM symbol group (composed of a plurality of OFDM symbols), one slot, one slot group (composed of a plurality of slots), one subframe, one subframe group (composed of a plurality of subframes), one system frame, one system frame group (composed of a plurality of system frames); or may also be an absolute time unit, for example, 1 millisecond, 1 second, etc.; the time domain unit may also be a combination of various granularities, for example, N1 slots plus N2 OFDM symbols, wherein, N1 and N2 may be natural numbers.
A frequency domain unit (also referred to as a frequency unit) in the present disclosure may be: one subcarrier, one subcarrier group (composed of a plurality of subcarriers), one Resource Block (RB), which may also be referred to as a Physical Resource Block (PRB), one resource block group (composed of a plurality of RBs), one frequency band part (also referred to as BandWidth Part (BWP)), one frequency band part group (composed of a plurality of BWPs)), one frequency band/carrier, one frequency band group/carrier group; or may also be an absolute frequency unit, for example, 1 Hz, 1 kHz, etc.; the frequency domain unit may also be a combination of various granularities, for example, M1 PRBs plus M2 subcarriers, wherein, M1 and M2 may be natural numbers.
Exemplary embodiments of the present disclosure are further described below in conjunction with the accompanying drawings.
The text and drawings are provided by way of examples only to assist the reader in understanding the present disclosure. They are not intended and should not be construed to limit the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art based on the disclosure herein that the shown embodiments and examples may be modified without departing from the scope of the present disclosure.
Transmission links in the wireless communication system mainly includes: a downlink communication link from a gNB to a User Equipment (UE), and an uplink communication link from a UE to a network.
Nodes for positioning measurement (also referred to as location measurement) in the wireless communication system (c.g., a current wireless communication system) may include: a UE for initiating a positioning request message, a Location Management Function (LMF) for issuance of positioning assistance data and UE positioning, a gNB or Transmission-Reception Point (TRP) for broadcasting positioning assistance data and uplink positioning measurement, and a UE for downlink positioning measurement.
In a process of performing positioning measurement, the transmitter transmits a reference signal for positioning; the receiver measures the reference signal for positioning, calculates and reports a positioning measurement result, or reports assistance information to the transmitter, and the transmitter calculates the positioning measurement result.
In order to provide positioning services of higher accuracy and lower latency, a carrier phase-based positioning measurement method may be used to further reduce a positioning measurement error. The carrier phase-based positioning measurement method implements positioning measurement by detecting a change (e.g., a difference value) between carrier phases of the transmitter and the receiver. Wherein the difference value between the carrier phases of the transmitter and the receiver may be divided into two portions: an integer part carrier phase difference and a fractional part carrier phase difference (of a carrier cycle). As compared with a positioning measurement method using Time Difference of Arrival (TDOA) (hereinafter briefly referred to as a TDOA method or a TDOA measurement method), the carrier phase-based positioning measurement method is not limited by time domain sampling frequency; and because it neither requires oversampling nor requires an interpolation process, it is simpler than the TDOA method. However, considering that the reference signal for positioning is affected by a multipath effect and Doppler frequency shift during a propagation process, the reference signal for positioning may have serious phase shift occur at the transmitter and the receiver, which, in extreme cases, will lead to phase jumping, that is, a cycle slip phenomenon. The above-described problems have brought great difficulties to positioning measurement using the carrier phase; and how to implement carrier phase-based positioning measurement in a rich-scatter environment is a problem that needs to be solved.
When using PRS and/or SRS-POS for the carrier phase-based positioning measurement, the configuration method for the above-described reference signal for positioning may include a combination of one or more of items below:
Optionally, after configuring the reference signal for carrier phase positioning, the receiver judges whether the conditions for enabling the carrier phase-based positioning measurement method are satisfied; and when the conditions are satisfied, the carrier phase-based positioning measurement method may be used for positioning measurement; otherwise, the carrier phase-based positioning measurement method may not be used for positioning measurement. The conditions may include a combination of one or more of items below:
Those skilled in the art should understand that, although the RSRP of the reference signal is taken as an example to describe the parameter used to determine whether to enable the carrier phase-based positioning measurement method above, yet parameters such as the Reference Signal Receiving Quality (RSRQ), Received Signal Strength Indication (RSSI), etc. of the reference signal may also be used when judging whether to enable the carrier phase-based positioning measurement method, without departing from the scope of the present disclosure.
Based on any one of the above-described embodiments, ensuring synchronization of the clocks of the transmitter and the receiver may reduce carrier phase shift caused by clock offset. Therefore, optionally, the method may further include keeping the clocks of the transmitter and the receiver synchronized. For example, when the first condition is satisfied, the clocks of the transmitter and the receiver are to be kept synchronized.
In some embodiments, the manner for keeping the clocks of the transmitter and the receiver synchronized may include a combination of one or more of items below:
Based on any one of the above-described embodiments, when the carrier phase-based positioning measurement method is used to perform positioning measurement, a residual carrier phase shift may also be compensated for, so as to improve positioning accuracy. The method for compensating for residual carrier phase shift may include a combination of one or more of items below:
Based on any one of the above-described embodiments, measurement results reported and/or transmitted when the carrier phase-based positioning measurement method is used for positioning measurement may include at least one of items below:
When the carrier phase-based positioning measurement method is used for uplink positioning measurement, the error of positioning measurement will be reduced, so that the clock offset error δ(t) used to calculate the reference signal time difference is more accurate. Therefore, accuracy of the reference signal time difference may be improved, to further improve accuracy of the positioning measurement result.
In
As shown in
The transceiver 610 collectively refers to a UE receiver and a UE transmitter, and may transmit/receive a signal to/from a base station or a network entity. The signal transmitted or received to or from the base station or a network entity may include control information and data. The transceiver 610 may include a RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and a RF receiver for amplifying low-noise and down-converting a frequency of a received signal. However, this is only an example of the transceiver 610 and components of the transceiver 610 are not limited to the RF transmitter and the RF receiver.
Also, the transceiver 610 may receive and output, to the processor 630, a signal through a wireless channel, and transmit a signal output from the processor 630 through the wireless channel.
The memory 620 may store a program and data required for operations of the UE. Also, the memory 620 may store control information or data included in a signal obtained by the UE. The memory 620 may be a storage medium, such as read-only memory (ROM), random access memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.
The processor 630 may control a series of processes such that the UE operates as described above. For example, the transceiver 610 may receive a data signal including a control signal transmitted by the base station or the network entity, and the processor 630 may determine a result of receiving the control signal and the data signal transmitted by the base station or the network entity.
As shown in
The transceiver 710 collectively refers to a base station receiver and a base station transmitter, and may transmit/receive a signal to/from a terminal or a network entity. The signal transmitted or received to or from the terminal or a network entity may include control information and data. The transceiver 710 may include a RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and a RF receiver for amplifying low-noise and down-converting a frequency of a received signal. However, this is only an example of the transceiver 710 and components of the transceiver 710 are not limited to the RF transmitter and the RF receiver.
Also, the transceiver 710 may receive and output, to the processor 730, a signal through a wireless channel, and transmit a signal output from the processor 730 through the wireless channel.
The memory 720 may store a program and data required for operations of the base station. Also, the memory 720 may store control information or data included in a signal obtained by the base station. The memory 720 may be a storage medium, such as read-only memory (ROM), random access memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.
The processor 730 may control a series of processes such that the base station operates as described above. For example, the transceiver 710 may receive a data signal including a control signal transmitted by the terminal, and the processor 730 may determine a result of receiving the control signal and the data signal transmitted by the terminal.
In the afore-described embodiments of the present disclosure, elements included in the present disclosure are expressed in a singular or plural form according to the embodiments. However, the singular or plural form is appropriately selected for convenience of explanation and the present disclosure is not limited thereto. As such, an element expressed in a plural form may also be configured as a single element, and an element expressed in a singular form may also be configured as plural elements.
“User equipment” or “UE” herein may refer to any terminal having wireless communication capabilities, including but not limited to a mobile phone, a cellular phone, a smart phone or a Personal Digital Assistant (PDA), a portable computer, an image capture device such as a digital camera, a gaming device, a music storage and playback device, and any portable unit or terminal having wireless communication capabilities, or an Internet facility that allows wireless Internet access and browsing, etc.
The term “base station” (BS) or “network device” as used herein may refer to an eNB, an eNodeB, a NodeB or a base station transceiver (BTS) or a gNB, etc., depending on the technology and terminology used.
“Memory” herein may be of any type suitable for the technical environment herein and may be implemented by using any suitable data memory technology, including but not limited to a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, a fixed memory and a removable memory.
The processor herein may be of any type suitable for the technical environment herein, including but not limited to one or more of items below: a general purpose computer, a special purpose computer, a microprocessor, a Digital Signal Processor (DSP), and a processor based on a multi-core processor architecture.
The above merely are preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modification, equivalent substitution, improvement, and the like, made within the spirit and principles of the present disclosure should be covered within the protection scope of the present disclosure.
Those skilled in the art may understand that the present disclosure includes devices for performing one or more of the operations described in the present disclosure. These devices may be specially designed and fabricated for required purposes or may also include those known devices in general purpose computers. These devices have computer programs stored therein; and these computer programs are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium or stored in any type of medium suitable for storing electronic instructions and respectively coupled to a bus; the computer readable medium includes, but is not limited to, any type of disk (including a floppy disk, a hard disk, an optical disk, a CD-ROM, and a magneto-optical disk), a Read-Only Memory (ROM), a Random Access Memory (RAM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a flash memory, a magnetic card or an optical card. That is, a readable medium includes any medium that stores or transmits information in a form that may be read by a device (e.g., a computer).
Those skilled in the art may understand that computer program instructions may be used to implement each block of these structural diagrams and/or block diagrams and/or flow diagrams, and combinations of blocks in these structural diagrams and/or block diagrams and/or flow diagrams. Those skilled in the art may understand that, these computer program instructions may be provided to a general-purpose computer, a professional computer or a processor of other programmable data processing methods to implement, so that solutions specified in a block or a plurality of blocks of the structural diagrams and/or block diagrams and/or flow diagrams disclosed by the present disclosure may be executed by a computer or a processor of other programmable data processing method.
Those skilled in the art may recognize that, the present disclosure may be implemented in other specific forms without changing the technical idea or essential features of the present disclosure. Therefore, it should be understood that the above-described embodiments are merely examples and are not limited. The scope of the present disclosure is defined by the appended claims, rather than detailed description. Therefore, it should be understood that all modifications or changes derived from the meaning and scope of the appended claims and equivalents thereof are within the scope of the present disclosure.
In the above-described embodiments of the present disclosure, all operations and steps may be selectively performed or may be omitted. Furthermore, operations and steps in each embodiment need not be performed sequentially, and the order of operations and steps may vary.
Although the present disclosure has been illustrated and described with reference to various embodiments of the present disclosure, those skilled in the art will understand that various changes may be made in form and detail without departing from the spirit and scope of the present disclosure as defined by the appended claims and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202210152359.5 | Feb 2022 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2023/002271 | 2/16/2023 | WO |
