Frequency adjustment in wireless transmission and reception

Abstract

The present disclosure provides a timing adjustment or frequency offset configured to at least partially compensate for Doppler shift of a signal, physical channel, or resource during wireless transmission (e.g., due to distance of a satellite transmitter or relative velocity of a terrestrial receiver). The characteristic of compensation includes one of resource element (RE) mapping, channel state information reference signal (CSI-RS) configuration, bandwidth part (BWP) configuration, or control resource set (CORESET) configuration. Information indicating a plurality of configurations is transmitted from a base station (BS) to at least one user equipment (UE). The timing adjustment or frequency offset is specifically configured for one UE, a group of UEs, or UEs served by a single serving cell. Joint transmission from multiple cells / TRPs / point beams can involve partial / total subcarrier alignment.

Description

Technical Field

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 085,635, filed September 30, 2020, and U.S. Provisional Patent Application No. 63 / 105,109, filed October 23, 2020. These patent documents are incorporated herein by reference.

[0002] This disclosure generally relates to electronic devices and methods for frequency offset adjustment, and more specifically to instructions for frequency offset adjustment of frequency domain RE mapping, CSI-RS resource configuration, CORESET configuration, and BWP configuration. Background Technology

[0003] Given the successive generations of wireless communication development, these technologies have primarily been developed for human-oriented services such as voice calls, multimedia services, and data services. With the commercialization of 5G (fifth-generation) communication systems, the number of connected devices is expected to grow exponentially. These will increasingly connect to communication networks. Examples of the Internet of Things (IoT) might include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to evolve in various forms, such as augmented reality glasses, virtual reality headsets, and holographic devices. Efforts are underway to develop improved 6G communication systems to provide a wide range of services by connecting hundreds of billions of devices and things in the 6G (sixth-generation) era. For these reasons, 6G communication systems are being called systems that go beyond 5G.

[0004] The 6G communication system, which is expected to be commercialized around 2030, will have peak data rates in the tera (1000 gigabits) range and radio latency of less than 100 μsec, making it 50 times faster than 5G communication systems and with 1 / 10 of their radio latency.

[0005] To achieve such high data rates and ultra-low latency, 6G communication systems have been considered for implementation in the terahertz band (e.g., the 95 GHz to 3 THz band). It is anticipated that technologies capable of ensuring signal transmission distance (i.e., coverage) will become even more critical, as path loss and atmospheric absorption in the terahertz band are more severe than those in the millimeter-wave band introduced in 5G. As a key technology for ensuring coverage, it is necessary to develop radio frequency (RF) components, antennas, and novel waveforms with better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, and multi-antenna transmission technologies such as massive MIMO. Furthermore, new technologies for improving terahertz band signal coverage have been discussed, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable smart surfaces (RIS).

[0006] Furthermore, to improve spectrum efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology enabling uplink and downlink transmissions to use the same frequency resources simultaneously; network technologies that comprehensively utilize satellites, high-altitude platform stations (HAPS), etc.; improved network architectures to support mobile base stations, enabling network operation optimization and automation; dynamic spectrum sharing technology based on spectrum usage prediction to avoid conflicts; the use of artificial intelligence (AI) in wireless communication to improve overall network operation by leveraging AI from the 6G development design phase and internalizing end-to-end AI support functions; and next-generation distributed computing technologies to overcome UE computing power limitations through ultra-high-performance communication and computing resources accessible on the network, such as mobile edge computing (MEC) and the cloud. In addition, efforts are continuing to enhance connectivity between devices, optimize networks, promote the software-defined networking of network entities, and increase the openness of wireless communication by designing new protocols to be used in 6G communication systems, developing mechanisms for achieving hardware-based secure environments and secure data usage, and developing technologies for maintaining privacy.

[0007] The research and development of 6G communication systems in hyper-connectivity, including human-to-machine (P2M) and machine-to-machine (M2M) communication, is expected to bring the next hyper-connected experience. Specifically, services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas are anticipated to be provided through 6G communication systems. Furthermore, services such as remote surgery for enhanced security and reliability, industrial automation, and emergency response will be offered via 6G communication systems, enabling the technology to be applied to various fields such as industry, healthcare, automotive, and home appliances.

[0008] To meet the increased demand for wireless data services since the deployment of fourth-generation (4G) or Long Term Evolution (LTE) communication systems, and to enable various vertical applications, efforts have been made to develop and deploy improved fifth-generation (5G) and / or New Radio (NR) or pre-5G / NR communication systems. Therefore, 5G / NR or pre-5G / NR communication systems are also referred to as "beyond 4G networks" or "post-LTE systems." 5G / NR communication systems are considered to be implemented in higher frequency (millimeter-wave) bands (e.g., 28 GHz or 60 GHz bands) to achieve higher data rates, or in lower frequency bands (e.g., 6 GHz) to achieve robust coverage and mobility support. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are discussed in 5G / NR communication systems.

[0009] In addition, in 5G / NR communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, cooperative multipoint (CoMP), and receiver interference cancellation. Summary of the Invention

[0010] Technical issues

[0011] The discussion of 5G systems and related technologies is for informational purposes only, as some embodiments of this disclosure can be implemented in 5G systems, sixth-generation (6G) systems, or even higher versions that may use terahertz (THz) frequency bands. However, this disclosure is not limited to any particular category of systems or associated frequency bands, and embodiments of this disclosure can be used in conjunction with any frequency band. For example, aspects of this disclosure can also be applied to the deployment of 5G communication systems, 6G communication systems, or communications using THz frequency bands.

[0012] Technical solution

[0013] Multiple timing adjustments or frequency offsets are configured, each at least partially compensating for Doppler shifts in signals, physical channels, or resources during radio transmission (e.g., due to distance from the satellite transmitter or relative velocity of the land receiver). The compensation characteristics include one of the following: Resource Element (RE) mapping, Channel State Information Reference Signal (CSI-RS) configuration, Bandwidth Part (BWP) configuration, or Control Resource Set (CORESET) configuration. Information indicating these multiple configurations is transmitted from the base station (BS) to at least one user equipment (UE). The timing adjustments or frequency offsets are specifically configured for a single UE, a group of UEs, or a UE served by a single serving cell. Joint transmissions from multiple cells / TRPs / spot beams may involve partial / full subcarrier alignment.

[0014] In one embodiment, a first transmission-reception point (TRP) configured for joint transmission or reception among multiple TRPs includes: a processor configured to apply one of timing adjustments or frequency offsets to one or more of a signal, channel, or resource among the TRPs; and a transceiver operatively coupled to the processor. The transceiver is configured to signal to a second TRP one of the applied timing adjustment or frequency offset values ​​and a requested timing adjustment or frequency offset value, to at least one user equipment (UE) the timing adjustment or frequency offset value to be applied to the transmission or reception of one or more of a signal, channel, or resource, and to jointly transmit one or more of a signal, channel, or resource with the second TRP on one or more frequencies.

[0015] In another embodiment, a user equipment (UE) configured to jointly transmit or receive with multiple transmit-receive points (TRPs) includes a transceiver configured to receive timing adjustments or frequency offset values ​​for transmission or reception to be applied to one or more of signals, channels, or resources jointly transmitted by a first TRP and a second TRP, and to receive one or more signals, channels, or resources from the first TRP and the second TRP at one or more frequencies. The UE includes a processor configured to apply one of the timing adjustments or frequency offsets to one or more of the received signals, channels, or resources.

[0016] In a third embodiment, a method performed by a first transmit-receive point (TRP) configured for joint transmission or reception among multiple TRPs includes: applying one of timing adjustment or frequency offset to one or more of a signal, channel, or resource among the TRPs; signaling to a second TRP the applied timing adjustment or frequency offset value and a requested timing adjustment or frequency offset value; signaling to at least one user equipment (UE) the timing adjustment or frequency offset value to be applied to the transmission or reception of one or more of the signal, channel, or resource; and jointly transmitting one or more of the signal, channel, or resource with the second TRP on one or more frequencies.

[0017] The first and second TRPs can be satellites or beams within a satellite. Signaling for timing adjustment values ​​can be in units of symbol duration, sampling duration, or seconds. Signaling for frequency adjustment values ​​can be in units of subcarrier spacing or Hertz (Hz).

[0018] One or more of the signals, channels, or resources may correspond to one or more of the following: Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH), or other data channels; or Physical Downlink Control Channel (PDCCH), Physical Uplink Control Channel (PUCCH), or other control channels. The UE may be configured with one or more data or control channel resource element (RE) mappings with corresponding timing adjustments or frequency offset values. The UE may be instructed which configuration to apply for transmitting or receiving one or more of the signals, channels, or resources.

[0019] One or more of the signals, channels, or resources may correspond to one of the Channel State Information Reference Signal (CSI-RS), Tracking Reference Signal (TRS), Demodulation Reference Signal (DMRS), Sounding Reference Signal (SRS), or other reference signals. When one or more of the signals, channels, or resources correspond to CSI-RS, the UE may be configured with one or more CSI procedures having a corresponding CSI-RS resource configuration including timing adjustments or frequency offset values, and the UE may be periodically or aperiodically triggered to measure the CSI-RS with the indicated configuration and send a CSI measurement report.

[0020] One or more of the signals, channels, or resources may correspond to a bandwidth portion (BWP). The UE may be configured with one or more BWP configurations with corresponding timing adjustments or frequency offset values, and the UE may be instructed to apply which configuration to the downlink (DL) or uplink (UL) BWP handover for transmission or reception.

[0021] One or more of the signals, channels, or resources may correspond to a control resource set (CORESET). The UE may be configured with one or more CORESET configurations with corresponding timing adjustment or frequency offset values, and the UE may be instructed to apply which configuration to receive downlink control information (DCI).

[0022] The first TRP preferably signals to the second TRP the time / frequency resources scheduled for joint transmission or reception, as well as the timing adjustment or frequency offset values ​​applied to the joint transmission or reception. The second TRP preferably determines the required timing adjustment or frequency offset value to align the transmission or reception of the second TRP with the joint transmission or reception of the first TRP. The first TRP and one or more other TRPs including the second TRP preferably jointly transmit or receive one or more signals, channels, or resources to or from one or more UEs including the UE.

[0023] The second TRP may perform at least one of the following operations: determine a timing adjustment or frequency offset value such that one or more of the signals, channels, or resources jointly transmitted by the first and second TRPs are received in a time- or frequency-aligned manner at one or more UEs including the UE; jointly transmit or receive with the first TRP in time or frequency partially or completely overlapping; and / or signal the transmit power level on partially or completely overlapping time and / or frequency resources. The first TRP may determine the transmit power level based on signaling from one or more other TRPs including the second TRP.

[0024] The UE's transmit power level can be determined to distribute the receive power level at the UE evenly across the scheduled time / frequency resources.

[0025] Other technical features will be apparent to those skilled in the art from the following figures, description and claims.

[0026] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used in this patent document. The term “coupled” and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are physically in contact with each other. The terms “transmit,” “receive,” and “communicate,” and their derivatives include both direct and indirect communication. The terms “include” and “comprising,” and their derivatives, mean unrestricted inclusion. The term “or” is inclusive, meaning and / or. The phrase “associated” and its derivatives mean including, being included, interconnected with, containing, being contained within, connected to or connected with, coupled to or coupled with, communicable, cooperating, interleaving, juxtaposing, proximate, being combined with or combined with, having, having attributes, having a relationship, or being related to, etc. The term “controller” refers to any device, system, or part thereof that controls at least one operation. Such a controller can be implemented in hardware or a combination of hardware and software and / or firmware. The functionality associated with any particular controller can be centralized or distributed, local or remote. When used with a list of items, the phrase "at least one" means that different combinations of one or more of the listed items may be used, and it may be necessary to use only one item from the list. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C. Therefore, the collection of items can be a single item or a collection of two or more items.

[0027] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each computer program being formed by computer-readable program code and contained in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation in appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of media accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, optical disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media that can permanently store data and media that can store data and be rewritten later, such as rewritable optical discs or erasable storage devices.

[0028] Definitions of other specific words and phrases are also provided in this patent document. Those skilled in the art will understand that, in many (if not most) cases, such definitions apply to the prior and future use of the words and phrases defined in this way.

[0029] Beneficial effects

[0030] According to this disclosure, resources can be used more efficiently in wireless communication systems. Attached Figure Description

[0031] To gain a more complete understanding of this disclosure and its advantages, the following description is now taken in conjunction with the accompanying drawings, in which:

[0032] Figure 1 An exemplary networking system utilizing frequency and timing adjustments in wireless transmission and reception is illustrated according to embodiments of the present disclosure;

[0033] Figure 2 An exemplary base station (BS) utilizing frequency and timing adjustments in wireless transmission and reception is illustrated according to embodiments of the present disclosure;

[0034] Figure 3 An exemplary electronic device is shown that communicates in a networked computing system using frequency and timing adjustments in wireless transmission and reception, according to embodiments of the present disclosure.

[0035] Figure 4 A high-level flowchart of frequency and / or timing adjustments in wireless transmission and reception from the perspective of a UE is shown according to an embodiment of the present disclosure.

[0036] Figure 5 A high-level flowchart of frequency and / or timing adjustment in wireless transmission and reception from a network perspective is shown according to embodiments of the present disclosure.

[0037] Figure 6 A high-level flowchart of subcarrier offset adjustment for RE mapping from the UE's perspective, according to an embodiment of this disclosure, is shown;

[0038] Figure 7 A high-level flowchart of subcarrier offset adjustment for RE mapping from a network perspective is shown according to an embodiment of the present disclosure;

[0039] Figure 8 A high-level flowchart of a CSI procedure configuration with subcarrier offset and trigger measurement report from the UE perspective, according to an embodiment of this disclosure, is shown.

[0040] Figure 9 A high-level flowchart of a CSI process configuration with subcarrier offset and triggered measurement reporting, from a network perspective, is shown according to an embodiment of this disclosure.

[0041] Figure 10 A high-level flowchart of a BWP configuration with subcarrier offset and handover from the UE's perspective, according to an embodiment of the present disclosure, is shown.

[0042] Figure 11 A high-level flowchart of a BWP configuration with subcarrier offset and handover from a network perspective, according to an embodiment of the present disclosure, is shown.

[0043] Figure 12 A high-level flowchart of a CORESET configuration with subcarrier offset from the UE's perspective, according to an embodiment of this disclosure, is shown.

[0044] Figure 13 A high-level flowchart of a CORESET configuration with subcarrier offset from a network perspective, according to an embodiment of the present disclosure, is shown.

[0045] Figure 14A and Figure 14B Examples of subcarrier alignment for joint transmission according to various embodiments of the present disclosure are shown;

[0046] Figure 15 A high-level flowchart from the UE's perspective, according to an embodiment of this disclosure, is shown, illustrating the coordination of joint transmissions between TRPs in the presence of time / frequency offsets; and

[0047] Figure 16A high-level flowchart from a network perspective is shown according to an embodiment of the present disclosure, illustrating the coordination of joint transmissions between TRPs in the presence of time / frequency offsets. Detailed Implementation

[0048] The accompanying drawings and various embodiments included herein, used to illustrate the principles of this disclosure, are merely illustrative and should not be construed as limiting the scope of this disclosure in any way. Furthermore, those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged wireless communication system.

[0049] References:

[0050] ●[1]3GPP, TR 38.811, NR supports research on non-terrestrial networks.

[0051] ●[2]3GPP, TR 38.821, supports NR solutions for non-terrestrial networks (NTN).

[0052] ●[3]RP-193234, NR solution supporting non-terrestrial networks (NTN), Thales, RAN#86, December 2019.

[0053] ●[4]RP-193235, New research on NB-IoT / eMTC support for NTN WID, MediaTek Inc., RAN#86, December 2019.

[0054] ●[5]3GPP, TS 38.331, 5G; NR; Radio Resource Control (RRC); Protocol Specification.

[0055] ●[6]3GPP, TS 38.214, 5G; NR; physical layer process of data.

[0056] The above references are incorporated herein by reference.

[0057] abbreviation:

[0058] NTN Non-Terrestrial Networks

[0059] BS base station

[0060] UE User Equipment

[0061] NR New Radio

[0062] 3GPP Third Generation Partnership Project

[0063] WI work projects

[0064] SI Research Project

[0065] LEO Low Earth Orbit

[0066] Earth orbit in MEO

[0067] GEO geosynchronous orbit

[0068] TBS transport block size

[0069] MCS modulation and coding scheme

[0070] SIB System Information Block

[0071] DCI Downlink Control Information

[0072] PDCCH Physical Downlink Control Channel

[0073] PDSCH Physical Downlink Shared Channel

[0074] PUCCH (Physical Uplink Control Channel)

[0075] PUSCH Physical Uplink Shared Channel

[0076] RRC Radio Resource Control

[0077] MSB most significant bit

[0078] LSB Least Significant Bit

[0079] DL downlink

[0080] UL uplink

[0081] NB-IoT Narrowband Internet of Things

[0082] eMTC Enhanced Machine Type Communication

[0083] LTE Long Term Evolution

[0084] PRB Physical Resource Block

[0085] NR New Radio

[0086] RV Redundant Version

[0087] mTRP Multiple Sender and Receiver

[0088] PCI Physical Cell ID

[0089] CORESET Core Resource Set

[0090] BWP bandwidth portion

[0091] NTN refers to a network or network segment that uses airborne or space-based vehicles to carry relay nodes or base stations [38.811]. Compared to traditional terrestrial networks, NTN can provide ubiquitous coverage and is less susceptible to disasters. There is growing interest in supporting NTN in NB-IoT, eMTC, LTE, and 5G systems. 3GPP completed a study in Rel-15 on NTN deployment scenarios, channel models, and potential impact areas on NR to support NTN [38.811]. Based on the results of TR [38.811], 3GPP further studied the necessary set of features / adaptations for supporting NTN in NR in Rel-16 [38.821]. In Rel-17, the WI [RP-193234] for NTN in NR and the SI [RP-193235] for NB-IoT / eMTC support of NTN were approved.

[0092] Due to the long distances between satellites and UEs, the link budget in NTN systems may be limited compared to traditional terrestrial networks. Link budget enhancement should be considered.

[0093] CoMP transmission and reception are features that improve coverage, cell edge throughput and system throughput. CoMP was initially introduced as an advanced feature of LTE, which utilizes multiple geographical transmission points to improve link performance. The most common situation is that the UE is located at the cell edge between two adjacent cells, which is the worst case, where the UE is farthest from the signal source. Various CoMP techniques can be roughly divided into three categories: coordinated scheduling / coordinated beamforming (CS / CB), dynamic point selection (DPS) and joint transmission (JT) [1].

[0094] Each technology takes a slightly different approach to how it utilizes coordination. In JT, data is transmitted simultaneously from multiple points to a single UE or multiple UEs. In DPS, data can be obtained from multiple points simultaneously, but data can only be sent from one point. In CS / CB, data is only available and sent from one point, and scheduling / beamforming determines which point will be sent to ensure no interference [1].

[0095] The subject matter of this disclosure can be applied to scenarios where wireless communication between a network and a UE experiences high frequency offsets due to, for example, Doppler shift, and where the network applies different amounts of frequency offset pre-compensation between neighboring cells. This situation in cellular communication includes, but is not limited to:

[0096] - Situations where the UE group moves at high speed, such as high-speed trains, hyperloops, airplanes, etc.

[0097] - Situations where the Transmitter-Receiver Point (TRP) moves at high speed, such as satellite or airborne base stations.

[0098] In the above scenario, regardless of whether mobility is on the UE group or on the TRP, for a given location, approaching and leaving a cell will experience different Doppler frequency shift values. In this case, the network can apply different frequency offset pre-compensation values ​​to neighboring cells to help the UE experience less drastic frequency shifts between cells.

[0099] The technology disclosed herein can be used in the following specific situations, including but not limited to those listed above, and these situations should be interpreted in a non-limiting sense:

[0100] -Including at least CoMP transmission between multiple cells such as JT and DPS.

[0101] - When the UE's primary serving cell, beam, or TRP changes.

[0102] A UE that moves at high speed relative to the corresponding cell will have a location-dependent variation in Doppler value, which is due to the movement of the UE or the BS, resulting in a frequency offset between the data received from the serving cell and the data received from neighboring cells. In conventional signaling for UEs with a (relative) fixed spatial relationship with the serving cell, resource blocks are allocated to the UE according to instructions received in the DCI. In conventional systems for UEs with varying serving cell relationships (i.e., multiple TRPs) but low mobility, signals received from different TRPs at the UE are aligned in the frequency domain. On the other hand, for UEs with varying serving cell relationships and high mobility, signals received from different TRPs at the UE may not be aligned in the frequency domain. For receiving signals from TRPs other than the serving cell, an indication of the frequency offset between signals from the serving cell and other TRPs is needed so that the UE can adjust its frequency domain reception window accordingly and receive signals from other TRPs [4]. The same applies when the UE is in the process of updating serving cell relationships, including changes in serving cells, beams, or TRPs with the same or different PCIs.

[0103] In addition, in order for the network to understand the channel quality and which channel to use, the network needs channel state information (CSI). This is especially true in mTRP transmissions, since TRPs are signaling in multiple cases. mTRPs can be dedicated signaling notifications (CS / CB) or they can be simultaneous signaling notifications (JT). Thus, multiple CSI procedures can be extended and configured for the network to understand the different assumed channel conditions of various sets of TRPs involved in the actual transmission. For the serving cell, CSI-RS is a mode configured within the time-frequency grid. Neighboring cells have CSI-RS modes with frequency offsets and skews compared to the serving cell. Locating signals in neighboring cells becomes difficult. To find the signal, either the time-frequency grid must be thoroughly searched (which is not efficient) or the frequency offset must be adjusted [4].

[0104] CoMP enhancements are not limited to LTE applications. Rel-16 NR introduces multiple DCIs for mTRPs. UEs can be scheduled using full / partial / non-overlapping DCIs from mTRPs. Each TRP has a different Control Resource Set (CORESET), a collection of physical resources concentrated in a specific region of the frequency domain that indicates where the DCIs are located. Since different TRPs may have different Doppler values, the CORESET should be configured with a frequency offset indication so that the UE can detect DCIs from different TRPs accordingly.

[0105] In satellite communication, a satellite can have multiple active spot beams, each of which can be considered a cell in cellular communication. For CoMP (Co-MP) between multiple spot beams on a satellite, the UE's physical transmit and receive points are identical. Therefore, the Doppler frequency shift at the UE from the two spot beams will not be different. However, the network can apply different Doppler pre-compensation values ​​to the spot beams, resulting in a frequency gap between the signals received from the two spot beams. However, in this case, the frequency gap is a function of the pre-compensation value, which is under the control of the network, not the UE. For CoMP between multiple spot beams on more than one satellite, the frequency gap between the signals received at the UE will be UE-specific.

[0106] This disclosure describes techniques, apparatus, and methods for supporting frequency offset adjustment. More specifically, it describes techniques, apparatus, and methods for supporting a given physical channel, signal, or resource, using one or more configurations with different frequency offset values ​​and dynamic indications regarding which configuration will be applied to transmission and reception. The disclosed techniques, apparatus, and methods can be applied not only to NTN systems but also to any other wireless communication system.

[0107] Figure 1 An exemplary networking system utilizing frequency and timing adjustments in wireless transmission and reception is shown according to various embodiments of the present disclosure. Figure 1 The illustrated embodiment of the wireless network 100 is for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.

[0108] like Figure 1As shown, wireless network 100 includes base stations (BS) 101, BS 102, and BS 103. BS 101 communicates with BS 102 and BS 103. BS 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a proprietary IP network, or other data network. In embodiments of this disclosure, each BS 101, 102, and 103 may be terrestrial, and wireless network 100 may be a terrestrial network; or at least BS 102 and / or BS 103 may be non-terrestrial (e.g., airborne or space-based), and wireless network 100 may be an NTN.

[0109] BS 102 provides wireless broadband access to network 130 to a first plurality of user equipments (UEs) within its coverage area 120. The first plurality of UEs includes UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R1); UE 115, which may be located in a second residence (R2); and UE 116, which may be a mobile device (M), such as a cellular phone, wireless laptop, wireless PDA, etc. In embodiments of this disclosure, one or more of UEs 111, 112, 113, 114, 115, and 116 may be mobile relative to BS 102 and / or BS 103 at high speed, such as on a high-speed train. BS 103 provides wireless broadband access to network 130 to a second plurality of UEs within its coverage area 125. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of BS 101-103 may communicate with each other and with UE 111-116 using 5G, LTE, LTE-A Advanced, WiMAX, WiFi, NR or other wireless communication technologies.

[0110] Depending on the network type, other well-known terms may be used instead of "base station" or "BS," such as Node B, evolved Node B ("eNodeB" or "eNB"), 5G Node B ("gNodeB" or "gNB"), or "access point." For convenience, the terms "base station" and / or "BS" are used in this disclosure to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, other well-known terms may be used instead of "user equipment" or "UE," such as "mobile station" (or "MS"), "subscriber station" (or "SS"), "remote terminal," "wireless terminal," or "user equipment." For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless devices that provide wireless access to the BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered to be a fixed device (such as a desktop computer or vending machine).

[0111] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are shown as approximately circular for illustrative and explanatory purposes only. It should be clearly understood that, depending on the configuration of the BS and variations in the radio environment associated with natural and man-made obstacles, the coverage areas associated with the BS, such as coverage areas 120 and 125, may have other shapes, including irregular shapes.

[0112] although Figure 1 An example of a wireless network 100 is shown, but more details can be found on other wireless networks. Figure 1 Various modifications can be made. For example, wireless network 100 can include any number of BSs and any number of UEs in any suitable arrangement. Furthermore, BS 101 can communicate directly with any number of UEs and provide these UEs with wireless broadband access to network 130. Similarly, each BS 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Additionally, BS 101, 102, and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0113] Figure 2 Exemplary base stations (BSs) utilizing frequency and timing adjustments in wireless transmission and reception are shown according to various embodiments of the present disclosure. Figure 2 The embodiment of BS 200 shown is for illustrative purposes only, and Figure 1 BS 101, 102, and 103 can have the same or similar configurations. However, BSs have a wide variety of configurations, and Figure 2 This disclosure is not intended to limit the scope to any particular implementation of BS.

[0114] like Figure 2As shown, the BS 200 includes multiple antennas 280a-280n, multiple radio frequency (RF) transceivers 282a-282n, transmit (Tx or TX) processing circuitry 284, and receive (Rx or RX) processing circuitry 286. The BS 200 also includes a controller / processor 288, a memory 290, and a backhaul or network interface 292.

[0115] RF transceivers 282a-282n receive incoming RF signals, such as signals transmitted by a UE in network 100, from antennas 280a-280n. RF transceivers 282a-282n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 286, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 286 sends the processed baseband signal to controller / processor 288 for further processing.

[0116] The TX processing circuit 284 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 288. The TX processing circuit 284 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 282a-282n receive the processed baseband or IF signal from the TX processing circuit 284 and up-convert the baseband or IF signal into an RF signal, which is then transmitted via antennas 280a-280n.

[0117] The controller / processor 288 may include one or more processors or other processing devices that control the overall operation of the BS 200. For example, the controller / processor 288 may control the RF transceivers 282a-282n, the RX processing circuitry 286, and the TX processing circuitry 284 to receive forward channel signals and transmit reverse channel signals, based on well-known principles. The controller / processor 288 may also support additional functions, such as more advanced wireless communication functions and / or processes described in further detail below. For example, the controller / processor 288 may support beamforming or directional routing operations, wherein outgoing signals from multiple antennas 280a-280n are weighted differently to effectively direct the output signal in a desired direction. The controller / processor 288 may support any of a variety of other functions in the BS 200. In some embodiments, the controller / processor 288 includes at least one microprocessor or microcontroller.

[0118] The controller / processor 288 is also capable of executing programs and other processes residing in the memory 290, such as the basic operating system (OS). The controller / processor 288 can move data into or out of the memory 290 as needed for the execution process.

[0119] The controller / processor 288 is also coupled to a backhaul or network interface 292. The backhaul or network interface 292 allows the BS 200 to communicate with other devices or systems via a backhaul connection or network. Interface 292 can support communication via any suitable wired or wireless connection. For example, when the BS 200 is implemented as part of a cellular communication system (such as a cellular communication system supporting 6G, 5G, LTE, or LTE-A), interface 292 can allow the BS 200 to communicate with other BSs via a wired or wireless backhaul connection. When the BS 200 is implemented as an access point, interface 292 can allow the BS 200 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). Interface 292 includes any suitable architecture supporting communication over a wired or wireless connection, such as Ethernet or an RF transceiver.

[0120] Memory 290 is coupled to controller / processor 288. A portion of memory 290 may include RAM, while another portion of memory 290 may include flash memory or other ROM.

[0121] As described in more detail below, base stations in a networked computing system can be assigned as either a source BS or a slave BS based on their interference relationships with other neighboring BSs. In some embodiments, the assignment may be provided by a shared spectrum manager. In other embodiments, the assignment may be agreed upon by the BSs in the networked computing system. The source BS sends an OSS to the slave BS to establish the slave BS's transmission timing.

[0122] although Figure 2 An example of BS 200 is shown, but it is possible to modify it. Figure 2 Various changes can be made. For example, BS 200 may include... Figure 2 Each component can be any number shown. As a specific example, an access point may include multiple interfaces 292, and the controller / processor 288 may support routing functionality to route data between different network addresses. As another specific example, although shown as a single instance including TX processing circuitry 284 and a single instance including RX processing circuitry 286, the BS200 may include multiple instances of each (such as one per RF transceiver). Furthermore, Figure 2 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed.

[0123] Figure 3Exemplary electronic devices are illustrated that communicate in a networked computing system using frequency and timing adjustments in wireless transmission and reception, according to various embodiments of the present disclosure. In one embodiment, electronic device 300 is a user device implemented as a mobile device, which may represent Figure 1 One of UEs 111, 112, 113, 114, 115, and 116.

[0124] like Figure 3 As shown, the electronic device 300 includes a bus system 305 that supports communication between at least one processing device 310, at least one storage device 315, at least one communication unit 320 and at least one input / output (I / O) unit 325.

[0125] Processing device 310 executes instructions that can be loaded into memory 330. Processing device 310 may include any suitable number and type of processors or other devices in any suitable arrangement. Example types of processing device 310 include microprocessors, microcontrollers, digital signal processors, field-programmable gate arrays, application-specific integrated circuits (ASICs), and discrete circuits.

[0126] Memory 330 and permanent memory 335 are examples of storage device 315, representing any structure capable of storing and facilitating the retrieval of information such as data, program code, and / or other suitable temporary or permanent information. Memory 330 may represent random access memory or any other suitable volatile or non-volatile storage device. Persistent memory 335 may contain one or more components or devices supporting long-term storage of data, such as read-only memory, hard disk drive, flash memory, or optical disk.

[0127] Communication unit 320 supports communication with other systems or devices. For example, communication unit 320 may include a network interface card or a wireless transceiver to facilitate communication via network 130. Communication unit 320 can support communication via any suitable physical or wireless communication link.

[0128] I / O unit 325 allows for data input and output. For example, I / O unit 325 can provide connectivity for user input via a keyboard, mouse, keypad, touchscreen, or other suitable input device. I / O unit 325 can also send output to a display, printer, or other suitable output device.

[0129] although Figure 3 An example of an electronic device 300 in a wireless system is shown, the wireless system including multiple such electronic devices, such as Figure 1 UEs 111, 112, 113, 114, 115, and 116 are included, but it is possible to... Figure 3 Make various changes. For example, Figure 3The various components within can be combined, further subdivided, or omitted, and additional components can be added as needed. Furthermore, like computing and communication networks, electronic devices can have a wide variety of configurations, and... Figure 3 This disclosure is not limited to any particular electronic device.

[0130] The following disclosed design can be applied not only to NTN systems, but also to systems such as... Figures 1 to 3 Any other wireless communication system implemented as shown. Examples of NTN systems should be considered in an inclusive manner, without excluding other wireless communication systems. For example, the disclosed methods can be applied to both LTE and NR, or any future or existing communication system with high mobility at the UE, BS, or both.

[0131] Figure 4 A high-level flowchart of frequency and / or timing adjustments in wireless transmission and reception from the UE's perspective is shown according to various embodiments of this disclosure. Figure 4 The embodiments described are for illustrative purposes only. Other embodiments of process 400 may be used without departing from the scope of this disclosure.

[0132] In procedure 400, subcarrier offsets are configured for the UE for various signals, channels, and resources by the serving cell, and the UE applies the configured frequency offsets during transmission or reception. For example, the frequency offset can be expressed in units of subcarrier spacing, which can be fixed or vary depending on the system configuration. It should be understood that different units of frequency quantity can also be used for signaling, in addition to subcarrier spacing. Procedure 400 is described from the UE's perspective. In operation 401, signals, channels, and / or resources include, but are not limited to, any DL / UL physical channels in LTE / NR, any reference signals in LTE / NR, and any resource configurations such as CORESET, BWP, etc. In operation 401, the UE is configured with a frequency offset, which will be applied to adjust the frequency domain resource grid used for transmission or reception. In operation 402, the UE applies the configured frequency offset to adjust the frequency domain resource grid used for transmission or reception.

[0133] Combination Figure 5 Process 500 in the diagram describes the corresponding part of process 400 from a network perspective.

[0134] Figure 5 A high-level flowchart of frequency and / or timing adjustment in wireless transmission and reception from a network perspective is shown according to various embodiments of the present disclosure. Figure 5 The embodiments described are for illustrative purposes only. Other embodiments of process 500 may be used without departing from the scope of this disclosure.

[0135] In operation 501 of process 500, the network configures different settings for various signals, channels, and / or resources, as previously described for a UE with a corresponding frequency offset. For example, each configuration may correspond to transmission from or reception by a different TRP, cell, or beam experiencing different frequency offset values. In operation 502, the network transmits to or receives from the UE according to the configuration including the frequency offset. Depending on the configuration of operation 501, the actual transmission or reception point may be the serving cell / TRP / beam, neighboring cells / TRP / beams, or any combination thereof. The UE may or may not know which cells / TRPs / beams are involved in the transmission / reception.

[0136] For example, multiple satellite / spot beams can apply different timing advance values ​​to a geographic service area. When adjacent satellite / spot beams perform joint transmission for a UE, for example, at the boundary of the service area from two adjacent satellite / spot beams, if the arrival time difference of signals from different satellite / spot beams is greater than the cyclic prefix duration of the OFDM symbol, the signals transmitted from different satellite / spot beams may not be effectively combined at the UE. Therefore, in this case, timing adjustments from adjacent satellite / spot beams are required to effectively perform joint transmission.

[0137] Figure 6 A high-level flowchart of subcarrier / timing offset adjustment for RE mapping from the UE's perspective is shown according to various embodiments of this disclosure. Figure 6 The embodiments described are for illustrative purposes only. Other embodiments of process 600 may be used without departing from the scope of this disclosure.

[0138] exist Figure 6 In operation 601, the UE is configured with multiple RE mapping configurations for a given physical channel, each with a corresponding subcarrier / timing offset. In operation 602, the UE receives control information, such as a DCI or Media Access Control (MAC) control element (CE), regarding which RE mapping configuration will be applied to transmit or receive on the indicated physical channel. In operation 603, the UE applies the configured frequency / timing offset to adjust the frequency domain / time domain resource grid for transmit or receive on the corresponding physical channel.

[0139] Combination Figure 7 Process 700 in the diagram describes the corresponding part of process 600 from a network perspective.

[0140] Figure 7 A high-level flowchart of subcarrier / timing offset adjustment for RE mapping from a network perspective is shown according to various embodiments of the present disclosure. Figure 7 The embodiments described are for illustrative purposes only. Other embodiments of process 700 may be used without departing from the scope of this disclosure.

[0141] exist Figure 7 In operation 701, the network configures multiple RE mappings for a given physical channel with corresponding subcarrier / timing offsets. For example, each configuration may correspond to transmission from or reception by different TRPs, cells, or beams experiencing different frequency offset values. The UE may or may not know which cells / TRPs / beams are involved in transmission / reception. In operation 702, the network instructs the UE via, for example, DCI or MAC CE, which RE mapping configuration will be applied to the indicated physical channel for transmission or reception. In operation 703, the network transmits to or receives from the UE according to the configuration with subcarrier / timing offsets indicated in operation 702. Depending on the configuration shown in operation 701, the actual transmission or reception point can be the serving cell / TRP / beam, neighboring cells / TRPs / beams, or any combination thereof.

[0142] Figure 6 and Figure 7 The physical channels included in the flowchart, namely PDSCH / PUSCH / PDCCH / PUCCH, should be interpreted as examples and can be any other physical channels defined in LTE / NR. For example, frequency offset is expressed in units of subcarrier spacing.

[0143] An example modification to the Information Element (IE) PDSCH-Config includes a subcarrier offset indicator, as shown below:

[0144]

[0145]

[0146] A UE can be configured with one or more such "PDSCH-RE-MappingQCL-Configs" with different "SubcarrierOffset" and "TimingOffset" values. The example above is for LTE PDSCH. The same principle can be applied to any other physical channel from LTE / NR or any current / future radio system. In the multiple RE mapping configurations configured, the network indicates to the UE via, for example, DCI or MAC CE, which mapping configuration will be applied to the transmission or reception of the corresponding physical channel. Upon receiving such an indication, the UE applies the indicated subcarrier offset to the resource block grid with respect to the serving cell or the default configuration and performs data transmission / reception accordingly. The indicated subcarrier / timing offset values ​​can be negative or positive.

[0147] The network can use such indications for CoMP transmit / receive. Due to the dynamic changes in the transmit / receive cell / TRP / beam, i.e., DPS, the network can signal to the UE the appropriate RE mapping and subcarrier / timing offset configuration for the corresponding transmit / receive cell / TRP / beam. The same principle can be applied to JT, where the actual set of participating cells / TRP / beams is aligned for transmission with the indicated RE mapping and subcarrier / timing offset configuration. JT can be transparent to the UE, i.e., the UE may not know the actual set of (multiple) participating cells / TRP / beams.

[0148] In LTE / NR, multiple CSI procedures can be configured for a single UE. CSI-RS resources can be configured for different numbers of antenna ports and various time / frequency locations. The possible time / frequency locations of CSI-RS resources are not entirely flexible, but rather follow one of the configuration patterns defined in the specification. To indicate a CSI-RS resource pattern with frequency shift compared to one of the defined configuration patterns, a subcarrier / timing offset is indicated in the CSI procedure configuration.

[0149] Figure 8 A high-level flowchart of a CSI procedure configuration with subcarrier / timing offset and trigger measurement report from the UE perspective is shown according to various embodiments of this disclosure. Figure 8 The embodiment of subcarrier / timing offset adjustment used in the CSI process is for illustrative purposes only. Other embodiments of process 800 may be used without departing from the scope of this disclosure.

[0150] exist Figure 8 In operation 801, the UE is configured with multiple CSI procedures and corresponding CSI-RS resource configurations with corresponding subcarrier / timing offsets. In operation 802, the UE is periodically configured by RRC or non-periodically triggered by DCI to perform CSI measurements and reporting. In operation 803, the UE applies the configured frequency / time offset to adjust the frequency domain / time domain resource grid for the transmission or reception of CSI-RS resources for the corresponding CSI procedure.

[0151] Combination Figure 9 Process 900 in the diagram describes the corresponding part of process 800 from a network perspective.

[0152] Figure 9 A high-level flowchart of a CSI process configuration with subcarrier / timing offset and trigger measurement reporting, from a network perspective, is shown according to various embodiments of this disclosure. Figure 9 The embodiment of subcarrier / timing offset adjustment used in the CSI process is for illustrative purposes only. Other embodiments of process 900 may be used without departing from the scope of this disclosure.

[0153] exist Figure 9 In operation 901, the network configures multiple CSI procedures and corresponding CSI-RS resource configurations with corresponding subcarrier / timing offsets. As an example, each configuration may correspond to CSI-RS transmissions from different TRPs, cells, or beams experiencing different frequency offset values. The UE may or may not know which set of cells / TRPs / beams is involved in the CSI-RS transmission. In operation 902, the network instructs the UE, via, for example, RRC or DCI, on which CSI procedure, measurement and reporting will be performed, given a specific situation. In operation 903, the network transmits CSI-RS for a specific CSI procedure using the corresponding resource configuration and subcarrier offset, and receives measurement reports from the UE, given a specific situation.

[0154] Figure 8 and Figure 9 The examples in this document are for CSI-RS, but the same principles disclosed in this embodiment can be applied to any DL / UL reference signal, such as cell-specific reference signal (CRS), tracking reference signal (TRS), demodulation reference signal (DMRS), sounding reference signal (SRS), etc. For illustrative purposes only, frequency offset is expressed in subcarrier spacing.

[0155] Exemplary modifications to the IE CSI-RS-ConfigNZP, including subcarrier / timing offset indication, are given in the following abstract syntax symbol one (ASN.1):

[0156]

[0157]

[0158] A UE can be configured with one or more such "CSI-RS-ConfigNZP" entries with different "SubcarrierOffset" values. The example above is an example of an LTE NZP CSI-RS configuration. The same principle can be applied to any DL / UL reference signal for LTE / NR or any current / future radio system. In multiple CSI procedure configurations, the UE is periodically configured or non-periodically triggered via DCI to perform CSI measurements and reporting for the indicated CSI procedure. Before measurement, the UE receives CSI-RS with the appropriate RRC-configured subcarrier / timing offset relative to the serving cell or default configuration. The indicated subcarrier / timing offset value can be negative or positive. The "subcarrierOffset" field corresponds to the additional frequency domain offset in the CSI-RS mapping equation in section 6.10.5.2 of TS 36.211, i.e., k = k' + 12m + subcarrierOffset, expressed in terms of the number of subcarriers. Zero-power CSI-RS (ZP-CSI-RS) can be configured in the same way as that disclosed for non-zero-power CSI-RS (NZP-CSI-RS) with subcarrierOffset.

[0159] The network can configure multiple CSI procedures for CoMP transmission, including but not limited to JT and DPS. Using multiple CSI procedures, the network can obtain CSI for different combinations of (multiple) cell / TRP / beams. In the case of JT, the actual set of (multiple) participating cells / TRP / beams can be transparent to the UE, i.e., the UE may not know the actual set of (multiple) participating cells / TRP / beams.

[0160] The use of a BWP (Bandwidth Positioner) is a means of adjusting the operating channel bandwidth of a UE. In networks where multiple cells, which may experience different frequency / timing offsets and therefore different frequency / time pre-compensation values, are configured with the same PCI, the BWP can be used as a means for the UE to hand over between cells without handover. As an example of such network operation, multiple spot beams of a satellite can be configured with the same PCI, and the network triggers a BWP handover to switch the serving beam used for the UE.

[0161] Figure 10 A high-level flowchart of a BWP configuration with subcarrier / timing offset and handover from the UE perspective is shown according to various embodiments of this disclosure. Figure 10 The embodiment of subcarrier / timing offset adjustment used in the BWP process is for illustrative purposes only. Other embodiments of process 1000 may be used without departing from the scope of this disclosure.

[0162] exist Figure 10In operation 1001, the UE is configured with a BWP configuration having a corresponding subcarrier / timing offset. In operation 1002, the UE receives control information regarding which BWP configuration will be applied to all channels and reference signals, such as DCI, MAC CE, or RRC. In operation 1003, the UE applies the configured subcarrier / timing offset to adjust the frequency / time domain position of the indicated BWP and performs any transmission or reception.

[0163] Combination Figure 11 Process 1100 in the diagram describes the corresponding part of process 1000 from a network perspective.

[0164] Figure 11 A high-level flowchart of a BWP configuration with subcarrier / timing offset and handover from a network perspective is shown according to various embodiments of the present disclosure. Figure 11 The embodiment of subcarrier / timing offset adjustment used in the BWP process is for illustrative purposes only. Other embodiments of process 1100 may be used without departing from the scope of this disclosure.

[0165] exist Figure 11 In operation 1101, the network configures multiple BWP configurations for the UE with corresponding subcarrier / timing offsets. For example, each configuration may correspond to a different TRP, cell, or beam experiencing different frequency / time offset values. In operation 1102, the network indicates to the UE which BWP configuration will be applied. In operation 1103, the network sends to or receives from the UE the BWP configuration with subcarrier / timing offsets indicated in operation 1102. The actual serving cell / TRP / beam can be changed according to the configuration indicated in operation 1101.

[0166] Exemplary modifications to the IE BWP, including a subcarrier / timing offset indicator, are given in ASN.1 below:

[0167]

[0168]

[0169] A UE can be configured with one or more "BWPs" with different "SubcarrierOffset" and "TimingOffset" values. The example above is an NR example. A similar principle can be applied to any current / future radio system. In multiple configured BWP configurations, the UE is indicated by the network via, for example, DCI, MAC CE, or RRC, which BWP configuration will be applied. Upon receiving such an indication, the UE assumes the newly switched BWP will be used for its transmission or reception and applies the corresponding RRC-configured subcarrier / timing offset for resource block grid adjustment. Therefore, unless explicitly configured elsewhere, the "SubcarrierOffset" and "TimingOffset" fields in this BWP will be used for all channels and reference signals. "SubcarrierOffset" is interpreted in units of configured subcarrier spacing. The offset value is applied to the indicated locationAndBandwidth configuration when determining the starting position of the configured bandwidth. The indicated subcarrier offset can be interpreted relative to the default BWP PRB grid configuration. The indicated subcarrier offset value can be negative or positive.

[0170] A CORESET is a time / frequency resource configuration that the UE monitors for potential DCI reception from the network. A UE can be configured with multiple CORESETs. In an NR mTRP design, a UE can receive DCI from up to two different TRPs. DCI from different TRPs can be independently scheduled to the UE using fully / partially / non-overlapping PDSCHs with separate HARQ procedures. In satellite communications, two different TRPs can be understood as two different spot beams from the same or different satellites. The network may have applied different frequency / time offset compensation values ​​to the two spot beams; therefore, the received DCI may exhibit a frequency / time offset.

[0171] Figure 12 A high-level flowchart of a CORESET configuration with subcarrier / timing offset from the UE perspective is shown according to various embodiments of the present disclosure. Figure 12 The embodiment of subcarrier / timing offset adjustment in the CORESET process is for illustrative purposes only. Other embodiments of process 1200 may be used without departing from the scope of this disclosure.

[0172] exist Figure 12 In operation 1201, the UE is configured with a CORESET having a corresponding subcarrier / timing offset. In operation 1202, the UE monitors the DCI from each configured CORESET having a corresponding subcarrier / timing offset.

[0173] Combination Figure 13Process 1300 in the text describes the corresponding part of process 1200 from a network perspective.

[0174] Figure 13 A high-level flowchart of a CORESET configuration with subcarrier / timing offset from a network perspective is shown according to various embodiments of the present disclosure. Figure 13 The embodiment of subcarrier / timing offset adjustment in the CORESET process is for illustrative purposes only. Other embodiments of process 1300 may be used without departing from the scope of this disclosure.

[0175] exist Figure 13 In operation 1301, the network configures multiple CORESETs with corresponding subcarrier / timing offsets to the UE. For example, each configuration may correspond to a different TRP, cell, or beam experiencing different frequency / timing offset values. In operation 1302, the network transmits DCI on each CORESET with the corresponding subcarrier / timing values.

[0176] An example modification to the IE ControlResourceSet, including a subcarrier / timing offset indicator, is shown below:

[0177]

[0178]

[0179] A UE can be configured with one or more "ControlResourceSets" with "subcarrierOffset" and "timingOffset" values. When the network instructs the UE to apply a certain CORESET configuration via a DCI, MAC CE, or RRC message, the UE applies the corresponding RRC-configured subcarrier / timing offset before receiving the PDCCH about the serving cell or default configuration. The "subcarrierOffset" and "timingOffset" fields correspond to the frequency domain offset expressed in the number of subcarriers (e.g., Hertz or any frequency metric) and the time domain offset expressed in a basic time unit (e.g., Ts in the NR / LTE specification, i.e., sampling duration, symbol, or any time metric). The indicated values ​​can be positive or negative.

[0180] In some embodiments, the network can be aligned to joint transmissions from multiple cells / TRPs / spot beams. Because two adjacent cells / TRPs / spot beams may apply different frequency offset compensation values, the received signal PRB grid may be misaligned at the UE. Furthermore, for joint transmissions in a single-frequency network (SFN) configuration, the signals received from two different cells / TRPs / spot beams at a given tone need to be identical. If two different signals are received at a given tone, these signals will interfere with each other.

[0181] In one embodiment, the network loads information on the tone with subcarrier offset between two cells / TRPs / spot beams, so that the reception at the UE is aligned.

[0182] Figure 14A and Figure 14B Examples of subcarrier alignment for joint transmission according to various embodiments of this disclosure are shown. Consider two spot beams of a satellite, as shown in configurations 1400 and 1410. If the network applies different frequency / timing offset compensation values ​​to the spot beams, the PRB grids 1401 and 1402 of the PRB n between the two spot beams at the UE will be misaligned as shown. Therefore, the network will need to load information about the tones from the two spot beams with corresponding subcarrier / timing offset values ​​so that reception will be aligned at the UE. For joint transmission, the same information bits need to be loaded between multiple TRPs on the same subcarrier. However, due to the application of different frequency offsets at different TRPs, if two TRPs load the same information on the same PRB and subcarrier index, they will not be aligned when received by the UE. Let n represent the frequency offset of the second TRP relative to the first TRP, in units of subcarrier tone. Then the information loaded on the subcarrier index k of the second TRP will be aligned in a modular manner with the information loaded on the subcarrier index k+n of the first TRP. Figure 14A As shown, the network can partially overlap its transmission by using only subcarrier 1403 from PRB n on the second beam used for JT, resulting in a "wasteful" subcarrier 1404. Alternatively, the network can achieve fully overlapping transmission by using subcarrier 1403 from PRB n and subcarrier 1405 from PRB n? 1 on the second beam of JT, as shown. Figure 14B As shown, this results in wasted subcarriers 1404 and 1406. This is in conjunction with the following pair of processes. Figure 1 Detailed embodiments of full / partial alignment are disclosed.

[0183] Figure 15 A high-level flowchart from the UE's perspective is shown according to various embodiments of this disclosure, illustrating the coordination of joint transmissions between TRPs in the presence of time / frequency offsets. Figure 15The embodiment of joint transmission between TRPs in the presence of time / frequency offset is for illustrative purposes only. Other embodiments of process 1500 may be used without departing from the scope of this disclosure.

[0184] In operation 1501, the first TRP notifies the participating TRPs of the joint transmission information scheduled for that TRP. The shared information includes the time / frequency resources used for transmission and the time / frequency offset applied to the first TRP's transmission. Since other TRPs may have different time / frequency offset values ​​applied to their respective transmissions, they can determine the required time / frequency adjustment amount to align their transmissions with the first TRP. This alignment between TRPs allows for more efficient combination of multiple transmitted signals at the UE. In operation 1502, the first TRP receives information from the second TRP regarding the partial / full alignment of the time / frequency resources used for joint transmission. Message exchange between the first and second TRPs can occur via the X2 / Xn interface. In the case of regenerated satellites, message exchange can occur via an inter-satellite link. In operation 1503, the first TRP determines the transmission power of the time / frequency resources based on the partial / full alignment information received from the second TRP and performs joint transmission. Figure 15 As shown, the alignment of joint transmissions between TRPs can depend in part on the decision of the second TRP. In this case, the UE will experience a power imbalance in the received signal across frequencies. To compensate for such a power imbalance, the first TRP can increase the transmission power of the partially non-overlapping joint transmissions.

[0185] Combination Figure 15 Process 1500 in the diagram describes the corresponding part of process 1600 from a network perspective.

[0186] Figure 16 A high-level flowchart from a network perspective is shown according to various embodiments of the present disclosure, illustrating the coordination of joint transmissions between TRPs in the presence of time / frequency offsets. Figure 16 The embodiment of joint transmission between TRPs in the presence of time / frequency offset is for illustrative purposes only. Other embodiments of process 1600 may be used without departing from the scope of this disclosure.

[0187] After the first TRP notifies the second TRP of the time / frequency resources and time / frequency offset information for the joint transmission in operation 1601, in operation 1602, the second TRP determines that its joint transmission is partially / fully aligned with the first TRP. If the second TRP is operating under low load and therefore has available resources to reposition other transmissions to other frequency ranges, the second TRP may determine to fully align its transmission with the first TRP, such as... Figure 14BExample 1410 illustrates this. Because different frequency offsets are applied between different TRPs, perfect alignment would result in more waste of guard band frequency resources. If the second TRP is under tight resource availability, it can determine to partially perform joint transmissions at that frequency. Furthermore, the second TRP can allocate different amounts of power across different overclocks. In operation 1602, this information can be transmitted with the first TRP. In operation 1603, the second TRP performs the joint transmission notified to the first TRP.

[0188] When the serving TRP schedules the UE on its time / frequency resources, it can also indicate the set of participating TRPs for joint transmission. This indication can be explicit or implicit. In the implicit approach, the UE can be configured with a set of PDSCH receive configurations that can be associated with a certain CSI procedure, and the UE can be indicated with an index of the PDSCH receive configuration. Each PDSCH receive configuration can be mapped to a certain set of TRPs for joint transmission, which can be transparent to the UE. The serving TRP can also indicate to the UE whether the joint transmissions are fully overlapping or partially overlapping. If the joint transmissions partially overlap between TRPs, the UE can perform channel estimation separately for fully overlapping and partially overlapping resources. If the joint transmissions are fully overlapping, the UE can assume that channel estimation can be performed on all bandwidths.

[0189] For illustrative purposes, the steps of the algorithm are described sequentially; however, some of these steps can be executed in parallel with each other. The above operational diagrams illustrate example methods that can be implemented according to the principles of this disclosure, and various modifications can be made to the methods shown in the flowcharts herein. For example, although shown as a series of steps, the individual steps in each diagram can overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps can be omitted or replaced by other steps.

[0190] Although this disclosure has been described with reference to exemplary embodiments, various changes and modifications will be apparent to those skilled in the art. This disclosure is intended to include such changes and modifications that fall within the scope of the appended claims.

[0191] [Industrial Applicability]

[0192] This disclosure may be used when multiple resources are used in a wireless communication system.

Claims

1. A first transmit-receive point (TRP), configured for joint transmission or reception among multiple TRPs, the first TRP comprising: The processor is configured to apply one of timing adjustments or frequency offsets to one or more signals, channels, or resources between TRPs; and The transceiver is operatively coupled to the processor and is configured to: Send to the second TRP the time / frequency resources for joint transmission scheduling and at least one of a timing adjustment value or a frequency offset value. Receive information from the second TRP regarding partial or full alignment of time / frequency resources for joint transmission with the first TRP, wherein the information is determined by the second TRP based on time / frequency resources scheduled for joint transmission and at least one of a timing adjustment value or a frequency offset value. Based on the transmission power of time / frequency resources according to partially or fully aligned information, the one or more signals, channels, or resources are transmitted in conjunction with the second TRP.

2. The first TRP of claim 1, wherein, The first and second TRPs are one of the beams on or within a satellite, and The timing adjustment value signaling is in units of symbol duration, sampling duration, and seconds, while the frequency offset value signaling is in units of subcarrier spacing or Hertz (Hz).

3. The first TRP of claim 1, wherein, The one or more signals, channels, or resources correspond to one or more of the following: Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH) or other data channels, or Physical downlink control channel (PDCCH), physical uplink control channel (PUCCH), or other control channels. In this context, one of the multiple TRPs uses one or more configurations of data or control channel resource element (RE) mappings with corresponding timing adjustment values ​​or frequency offset values ​​to configure the user equipment (UE). Among them, one of the plurality of TRPs indicates to the UE which configuration to apply to send or receive the one or more signals, channels, or resources, and The plurality of TRPs includes first and second TRPs.

4. The first TRP of claim 1, wherein, The one or more signals, channels, or resources correspond to one of the following: Channel State Information Reference Signal (CSI-RS), Tracking Reference Signal (TRS), Demodulation Reference Signal (DMRS), Sounding Reference Signal (SRS), and other reference signals. Where one or more signals, channels, or resources correspond to CSI-RS. One of the multiple TRPs uses one or more CSI procedures with corresponding CSI-RS resource configurations, including timing adjustment values ​​or frequency offset values, to configure the user equipment (UE). One of the plurality of TRPs periodically or aperiodically triggers the UE to measure the CSI-RS with an indicated configuration and sends a CSI measurement report, and The plurality of TRPs includes a first TRP and a second TRP.

5. The first TRP of claim 1, wherein, The one or more signals, channels, or resources correspond to a bandwidth portion (BWP). In this context, one of the multiple TRPs uses one or more BWP configurations with corresponding timing adjustment values ​​or frequency offset values ​​to configure the user equipment (UE). Specifically, one of the plurality of TRPs indicates to the UE which configuration to apply to downlink (DL) or uplink (UL) BWP handover for transmission or reception, and The plurality of TRPs includes first and second TRPs.

6. The first TRP of claim 1, wherein, The one or more signals, channels, or resources correspond to a control resource set (CORESET). Among them, one of the multiple TRPs uses one or more CORESET configurations with corresponding timing adjustment values ​​or frequency offset values ​​to configure the user equipment (UE). Among them, one of the multiple TRPs indicates to the UE which configuration to apply to receive downlink control information (DCI), and The plurality of TRPs includes first and second TRPs.

7. The first TRP of claim 1, wherein, The transceiver is also configured to: The transmission power level of the second TRP is received from the second TRP for time / frequency resources, and Determine the transmission power level of the first TRP.

8. A method performed by a first TRP configured for joint transmission or reception among a plurality of transmit-receive points (TRPs), the method comprising: Send to the second TRP the time / frequency resources for joint transmission scheduling and at least one of a timing adjustment value or a frequency offset value; Receive information from the second TRP regarding partial or full alignment of time / frequency resources for joint transmission with the first TRP, wherein the information is determined by the second TRP based on time / frequency resources scheduled for joint transmission and at least one of a timing adjustment value or a frequency offset value; and Based on the transmission power of time / frequency resources according to partially or fully aligned information, the one or more signals, channels, or resources are transmitted in conjunction with the second TRP.

9. The method according to claim 8, wherein, The one or more signals, channels, or resources correspond to one or more of the following: Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH) or other data channels, or Physical downlink control channel (PDCCH), physical uplink control channel (PUCCH), or other control channels. In this context, one of the multiple TRPs uses one or more configurations of data or control channel resource element (RE) mappings with corresponding timing adjustment values ​​or frequency offset values ​​to configure the user equipment (UE). Wherein, one of the plurality of TRPs indicates to the UE which configuration to apply for sending or receiving the one or more signals, channels, or resources, and The plurality of TRPs includes first and second TRPs.

10. The method according to claim 8, wherein, The one or more signals, channels, or resources correspond to one of the following: Channel State Information Reference Signal (CSI-RS), Tracking Reference Signal (TRS), Demodulation Reference Signal (DMRS), Sounding Reference Signal (SRS), and other reference signals. Where one or more signals, channels, or resources correspond to CSI-RS. One of the multiple TRPs uses one or more CSI procedures with corresponding CSI-RS resource configurations, including timing adjustment values ​​or frequency offset values, to configure the UE. One of the plurality of TRPs periodically or aperiodically triggers the UE to measure the CSI-RS with an indicated configuration and sends a CSI measurement report, and The plurality of TRPs includes a first TRP and a second TRP.

11. The method according to claim 8, wherein, The one or more signals, channels, or resources correspond to a bandwidth portion (BWP). In this context, one of the multiple TRPs uses one or more BWP configurations with corresponding timing adjustment values ​​or frequency offset values ​​to configure the user equipment (UE). Among these, one of the multiple TRPs indicates to the UE which configuration to apply to the downlink (DL) or uplink (UL) BWP handover for transmission or reception, and The plurality of TRPs includes first and second TRPs.

12. The method according to claim 8, wherein, The one or more signals, channels, or resources correspond to a control resource set (CORESET). Among them, one of the multiple TRPs uses one or more CORESET configurations with corresponding timing adjustment values ​​or frequency offset values ​​to configure the user equipment (UE). Among them, one of the multiple TRPs indicates to the UE which configuration to apply to receive downlink control information (DCI), and The plurality of TRPs includes first and second TRPs.

13. The method of claim 8, further comprising: The transmission power level of the second TRP for receiving time / frequency resources from the second TRP; as well as Determine the transmission power level of the first TRP.

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