Reference signal overlapping in wireless communications
By managing the behavior of reference signals to handle overlaps with uplink sub-bands through resource muting and behavior determination, the challenges of signal overlap are addressed, ensuring accurate and reliable transmission performance in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/078424
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-23
- Publication Date
- 2025-08-28
AI Technical Summary
In wireless communication systems, the overlap of reference signals with uplink sub-bands in the frequency domain can result in the cutting off of wide-band reference signals, leading to uncertainty and reduced transmission performance, particularly in scenarios involving positioning and sensing.
Methods and devices for determining and managing the receiving or transmitting behavior of reference signals to handle overlaps with uplink sub-bands, including resource muting configurations and behavior determination based on instructions from network elements, allowing for controlled reception and transmission of reference signals even in overlapping frequency domains.
Enhances transmission performance by ensuring accurate and reliable reception of reference signals, improving certainty and knowledge among communication nodes, and maintaining communication quality in frequency overlapping situations.
Smart Images

Figure CN2024078424_28082025_PF_FP_ABST
Abstract
Description
REFERENCE SIGNAL OVERLAPPING IN WIRELESS COMMUNICATIONSTECHNICAL FIELD
[0001] This document is directed generally to handling reference signal overlapping for wireless communication.BACKGROUND
[0002] In wireless communication systems, sub-band full duplex (SBFD) is a technique in a time division duplex (TDD) system, where a radio access network (RAN) node allocates frequency resources for an uplink (UL) transmission inside a downlink (DL) carrier, and the RAN node schedules a user device to transmit an UL reference signal or an UL data transmission in the UL sub-band within the DL carrier. SBFD techniques may increase UL capacity, UL coverage and reduce UL transmission latency.
[0003] Additionally, Integrated Sensing and Communication (ISAC) is a technology understood as a wireless perception technology based on communication systems, in which the communication system node (e.g, a RAN node or a user device) emits wide-band wireless signals to target areas or objects and analyzes the received wireless signals to obtain corresponding sensing measurement information, during which the communication system node also performs the data transmission in radio resources.
[0004] In some situations, including those involving positioning, sensing, and / or ISAC scenarios, in event that the RAN node transmits a wide-band reference signal inside a DL carrier, but the DL carrier may also be configured with UL sub-band (s) using SBFD, then the wide-band reference signal may be cut off since the RAN node may not transmit a DL reference signal (RS) and receive UL data in the same sub-band (s) (i.e., configured UL subband (s) ) . As such, ways to improve certainty and knowledge among communication system nodes during frequency overlapping situations to improve transmission performance may be desirable.SUMMARY
[0005] This document relates to methods, systems, apparatuses and devices for wireless communication. In some implementations, a method for wireless communication includes: determining, by a receiving node, a receiving behavior indicating how the receiving node is to receive a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol; and receiving, by the receiving node, the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol from a radio access network (RAN) node according to the receiving behavior.
[0006] In some other implementations, a method for wireless communication includes: determining, by a radio access network (RAN) node, a transmitting behavior indicating how to transmit a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol; and transmitting, by the RAN node, the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol to a receiving node according to the transmitting behavior.
[0007] In some other implementations, a device, such as a network device, is disclosed. The device may include one or more processors and one or more memories, wherein the one or more processors are configured to read computer code from the one or more memories to implement any of the methods above.
[0008] In yet some other implementations, a computer program product is disclosed. The computer program product may include a non-transitory computer-readable program medium with computer code stored thereupon, the computer code, when executed by one or more processors, causing the one or more processors to implement any of the methods above.
[0009] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 shows a block diagram of an example of a wireless communication system.
[0011] FIG. 2 shows a block diagram of an example configuration of a wireless access node of the wireless communication system of FIG. 1.
[0012] FIG. 3 shows a flow chart of an example method for wireless communication.
[0013] FIG. 4 shows a flow chart of another example method for wireless communication.
[0014] FIG. 5 is a time-frequency plot illustrating a first example behavior for a transmitting radio access network (RAN) node.
[0015] FIG. 6 is a time-frequency plot illustrating a second example behavior for a transmitting RAN node.
[0016] FIG. 7 is a time-frequency plot illustrating a third example behavior for a transmitting RAN node.
[0017] FIG. 8 is a time-frequency plot illustrating an example where a reference signal (RS) is cut off by an UL sub-band and active downlink (DL) bandwidth part (BWP) .DETAILED DESCRIPTION
[0018] The present description describes various embodiments of systems, apparatuses, devices, and methods for wireless communications that relates to handling reference signal overlapping, including where a reference signal overlaps with an uplink (UL) sub-band in the frequency domain.
[0019] FIG. 1 shows a diagram of an example wireless communication system 100 including a plurality of communication nodes (or just nodes) that are configured to wirelessly communicate with each other. In general, the communication nodes include at least one user device 102 and at least one wireless access node 104. The example wireless communication system 100 in FIG. 1 is shown as including two user devices 102, including a first user device 102 (1) and a second user device 102 (2) , and one wireless access node 104. However, various other examples of the wireless communication system 100 that include any of various combinations of one or more user devices 102 and / or one or more wireless access nodes 104 may be possible.
[0020] In general, a user device as described herein, such as the user device 102, may include a single electronic device or apparatus, or multiple (e.g., a network of) electronic devices or apparatuses, capable of communicating wirelessly over a network. A user device may comprise or otherwise be referred to as a user terminal, a user terminal device, or a user equipment (UE) . Additionally, a user device may be or include, but not limited to, a mobile device (such as a mobile phone, a smart phone, a smart watch, a tablet, a laptop computer, vehicle or other vessel (human, motor, or engine-powered, such as an automobile, a plane, a train, a ship, a bicycle, a drone, an unmanned aerial vehicle (UAV) , as non-limiting examples) or a fixed or stationary device, (such as a desktop computer or other computing device that is not ordinarily moved for long periods of time, such as appliances, other relatively heavy devices including Internet of things (IoT) , or computing devices used in commercial or industrial environments, as non-limiting examples) . In addition or alternatively, in any of various embodiments, a user device 102 may include an ambient IoT device, a normal user device, a reduced capacity (RedCap) user device, a low power high-accuracy positioning (LPHAP) user device, a sidelink user device, or a V2X user device.
[0021] In various embodiments, a user device 102 may include transceiver circuitry 106 coupled to an antenna 108 to effect wireless communication with the wireless access node 104. The transceiver circuitry 106 may also be coupled to a processor 110, which may also be coupled to a memory 112 or other storage device. The memory 112 may store therein instructions or code that, when read and executed by the processor 110, cause the processor 110 to implement various ones of the methods described herein.
[0022] Additionally, in general, a wireless access node as described herein, such as the wireless access node 104, may include at least one device, electronic and / or network device or apparatus, and may comprise one or more base stations or other wireless network access points capable of communicating wirelessly over a network with one or more user devices and / or with one or more other wireless access nodes 104. For example, the wireless access node 104 may comprise at least one of: a 4G LTE base station, a 5G NR base station, a 5G central-unit base station, a 5G distributed-unit base station, a next generation Node B (gNB) , an enhanced Node B (eNB) , or other similar or next-generation (e.g., 6G) base stations, or a location management function (LMF) , in various embodiments. A wireless access node 104 may include transceiver circuitry 114 coupled to an antenna 116, which may include an antenna tower 118 in various approaches, to effect wireless communication with the user device 102 or another wireless access node 104. The transceiver circuitry 114 may also be coupled to one or more processors 120, which may also be coupled to a memory 122 or other storage device. The memory 122 may store therein instructions or code that, when read and executed by the processor 120, cause the processor 120 to implement one or more of the methods described herein.
[0023] FIG. 2 shows a block diagram of an example configuration of a wireless access node 104. In the example configuration, the wireless access node (or network) 104 may include a core network element 202 and one or more radio access network (RAN) nodes 204. Some embodiments may include only one RAN node 204. Other embodiments, such as shown in FIG. 2, may include a plurality, or an n-number, of RAN nodes 204 (1) to 204 (n) , where n is two or more. In any of various embodiments, a RAN node 204 may be or include a Next Generation (NG) -RAN node, a gNB, a ng-eNB, a transmission reception point (TRP) , a transmission point (TP) , a reception point (RP) , a base station, and / or an integrated access and backhaul (IAB) node, an example of which is shown in FIG. 2. Also, in any of various embodiments, the core network element 202 may include at least one of: a location management function (LMF) 210, an access and mobility management function (AMF) 212, a user plane function (UPF) 214, and / or a sensing function (SF) 216. The core newtork element 202 may include alternative, other, or additional components in any of various other embodiments. Additionally, each component of the wireless access node 104, such as the core network element 202 and each RAN node 204, may include at least one network device, and / or may be configured in hardware or a combination of hardware and software, such as by having a processor 120, a memory 122, transceiver circuitry 114, an antenna 116, and / or an antenna tower 118, such as shown in FIG. 1 for the wireless access node 104.
[0024] Additionally, as shown in FIG. 2, the core network element 202 and each of the RAN nodes 204 may be configured to communicate (transmit and receive) with each other, such as signals or messages, and may be configured to communicate (transmit and receive) with one or more user device 102, either directly or indirectly via another component of the wireless access node (network) 104. For example, the core network element 202 (e.g., the LMF 210) may directly communicate with a user device 10, such as according to a Long-Term Evolution (LTE) positioning protocol (LPP) (i.e., via LPP signaling) , sidelink positioning protocol (SLPP) (i.e., via SLPP signaling) , and / or non-access-stratus (NAS) messaging, as non-limiting examples. In addition or alternatively, the signaling may be UE-associated signaling or non-UE-associated signaling. Also, a RAN node 204 may directly communicate with a user device 102. In particular embodiments, a RAN node 204 may directly communicate with a user device 102 at least via radio resource control (RRC) signaling. In addition, the core network element 202 may directly communicate with each RAN node 204, such as according to dedicated messaging for sensing, New Radio Positioning Protocol A (NRPPa) (i.e., via NRPPa signaling) , and / or Next Generation Application Protocol (NGAP) (i.e., via NGAP messaging) . In addition, RAN nodes 204 may directly communicate with each other, such as according to Xn application protocol (XnAP) (i.e., via XnAP messaging) . Additionally, although not shown in FIG. 2, two user devices 102 may directly communicate with each other, such as via dedicating messaging for sensing, SLPP signaling, PC5-RRC messaging, SL medium access control (MAC) control element (CE) , and / or sidelink control information (SCI) .
[0025] Also, for at least some embodiments, such as shown in FIG. 2, each RAN node 204 may include one or more sub-components. For example, a RAN node 204 may include a gNB and / or at least one transmission / reception point (TRP) 208. Additionally, as used herein unless specified otherwise, the terms “network” or “network device” may include at least one gNB 206, at least one ng-eNB, at least one TRP 208, at least one base station, at least one RAN node 204 (e.g., at least one NG-RAN node) and / or at least one core network element 202. Further functionality of the core network element 202 and the RAN nodes 204 is described in further detail below.
[0026] In addition, referring back to FIG. 1, in various embodiments, two communication nodes in the wireless system 100-such as a user device 102 and a wireless access node 104, two user devices 102 without a wireless access node 104, or two wireless access nodes 104 without a user device 102-may be configured to wirelessly communicate with each other in or over a mobile network and / or a wireless access network according to one or more standards and / or specifications. In general, the standards and / or specifications may define the rules or procedures under which the communication nodes can wirelessly communicate, which, in various embodiments, may include those for communicating in millimeter (mm) -Wave bands, and / or with multi-antenna schemes and beamforming functions. In addition or alternatively, the standards and / or specifications are those that define a radio access technology and / or a cellular technology, such as Fourth Generation (4G) Long Term Evolution (LTE) , Fifth Generation (5G) New Radio (NR) , or New Radio Unlicensed (NR-U) , as non-limiting examples.
[0027] Additionally, in the wireless system 100, the communication nodes are configured to wirelessly communicate signals between each other. In general, a communication in the wireless system 100 between two communication nodes can be or include a transmission or a reception, and is generally both simultaneously, depending on the perspective of a particular node in the communication. For example, for a given communication between a first node and a second node where the first node is transmitting a signal to the second node and the second node is receiving the signal from the first node, the first node may be referred to as a source or transmitting node or device, the second node may be referred to as a destination or receiving node or device, and the communication may be considered a transmission for the first node and a reception for the second node. Of course, since communication nodes in a wireless system 100 can both send and receive signals, a single communication node may be both a transmitting / source node and a receiving / destination node simultaneously or switch between being a source / transmitting node and a destination / receiving node.
[0028] Also, particular signals can be characterized or defined as either an uplink (UL) signal, a downlink (DL) signal, or a sidelink (SL) signal. An uplink signal is a signal transmitted from a user device 102 to a wireless access node 104. A downlink signal is a signal transmitted from a wireless access node 104 to a user device 102. A sidelink signal is a signal transmitted from a one user device 102 to another user device 102, or a signal transmitted from one wireless access node 104 to a another wireless access node 104. Also, for sidelink transmissions, a first / source user device 102 directly transmits a sidelink signal to a second / destination user device 102 without any forwarding of the sidelink signal to a wireless access node 104.
[0029] Additionally, signals communicated between communication nodes in the system 100 may be characterized or defined as a data signal or a control signal. In general, a data signal is a signal that includes or carries data, such multimedia data (e.g., voice and / or image data) , and a control signal is a signal that carries control information that configures the communication nodes in certain ways in order to communicate with each other, or otherwise controls how the communication nodes communicate data signals with each other. Also, certain signals may be defined or characterized by combinations of data / control and uplink / downlink / sidelink, including uplink control signals, uplink data signals, downlink control signals, downlink data signals, sidelink control signals, and sidelink data signals.
[0030] For at least some specifications, such as 5G NR, data and control signals are transmitted and / or carried on physical channels. Generally, a physical channel corresponds to a set of time-frequency resources used for transmission of a signal. Different types of physical channels may be used to transmit different types of signals. For example, physical data channels (or just data channels) are used to transmit data signals, and physical control channels (or just control channels) are used to transmit control signals. Example types of physical data channels include, but are not limited to, a physical downlink shared channel (PDSCH) used to communicate downlink data signals, a physical uplink shared channel (PUSCH) used to communicate uplink data signals, and a physical sidelink shared channel (PSSCH) used to communicate sidelink data signals. In addition, example types of physical control channels include, but are not limited to, a physical downlink control channel (PDCCH) used to communicate downlink control signals, a physical uplink control channel (PUCCH) used to communicate uplink control signals, and a physical sidelink control channel (PSCCH) used to communicate sidelink control signals. As used herein for simplicity, unless specified otherwise, a particular type of physical channel is also used to refer to a signal that is transmitted on that particular type of physical channel, and / or a transmission on that particular type of transmission. As an example illustration, a PDSCH refers to the physical downlink shared channel itself, a downlink data signal transmitted on the PDSCH, or a downlink data transmission. Accordingly, a communication node transmitting or receiving a PDSCH means that the communication node is transmitting or receiving a signal on a PDSCH.
[0031] Additionally, for at least some specifications, such as 5G NR, and / or for at least some types of control signals, a control signal that a communication node transmits may include control information comprising the information necessary to enable transmission of one or more data signals between communication nodes, and / or to schedule one or more data channels (or one or more transmissions on data channels) . For example, such control information may include the information necessary for proper reception, decoding, and demodulation of a data signals received on physical data channels during a data transmission, and / or for uplink scheduling grants that inform the user device about the resources and transport format to use for uplink data transmissions. In some embodiments, the control information includes downlink control information (DCI) that is transmitted in the downlink direction from a wireless access node 104 to a user device 102. In other embodiments, the control information includes uplink control information (UCI) that is transmitted in the uplink direction from a user device 102 to a wireless access node 104, or sidelink control information (SCI) that is transmitted in the sidelink direction from one user device 102 (1) to another user device 102 (2) .
[0032] In addition, in some embodiments, a transmitting node may transmit a reference signal for positioning, such via an interface. For example, a gNB 206 may transmit a downlink positioning reference signal (DL-PRS) to a user device 102 via a Uu interface. As another example, a user device 102 may transmit a sounding reference signal (SRS) to a gNB 206, such as via a Uu interface. As another example, a user device 102 may transmit a sidelink positioning reference signal (SL-PRS) to another user device 102.
[0033] FIG. 3 is a flow chart of an example method 300 of wireless communication involving overlapping in the frequency domain. At block 302, a receiving node determines a receiving behavior indicating how the receiving node is to receive a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol. At block 304, the receiving node receives the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol from a radio access network (RAN) node 206 according to the receiving behavior.
[0034] FIG. 4 is a flow chart of another example method 400 of wireless communication involving overlapping in the frequency domain. At block 402, a radio access network (RAN) node 206 determines a transmitting behavior indicating how to transmit a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol. At block 404, the RAN node 206 transmits the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol to a receiving node according to the transmitting behavior.
[0035] In some implementations of the method 300 and / or the method 400, the receiving node determines the receiving behavior or the transmitting behavior based on an instruction received from at least one network device, wherein the at least one network device comprises at least one of a core network element 202 or the RAN node 204.
[0036] In some implementations of the method 300 and / or the method 400, the instruction includes at least one of: the RS is not transmitted in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol; the RS only transmitted in a downlink (DL) sub-band over the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol; or the RS is transmitted in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0037] In some implementations of the method 300 and / or the method 400, the instruction includes a resource muting configuration, wherein the resource muting configuration includes at least one of a resource time muting configuration or a resource frequency muting configuration.
[0038] In some implementations of the method 300 and / or the method 400, the resource time muting configuration includes at least one of: a time division duplex (TDD) pattern of each cell or each transmission reception point (TRP) 208 of the RAN node 204; a periodic or an aperiodic sub-band full duplex (SBFD) time pattern of each cell or each TRP 208 of the RAN node 204; a SBFD configuration of each cell or each TRP 208 of the RAN node 204; a muting periodicity that is equal or not equal to a resource periodicity; a muting slot offset that indicates a starting slot of one or more muting resource instances; a muting symbol offset that indicates a starting symbol of one or more muting resource instances; a number of muted symbols that indicates one or more continuous muting symbols of one or more muting resource instances; a muting repetition factor that indicates a number of continuous muting instances of a resource; or a muting bitmap utilizing a predetermined bit value to indicate which of one or more resource instances are to be muted.
[0039] In some implementations of the method 300 and / or the method 400, the resource frequency muting configuration includes at least one of: a resource block (RB) start position of the UL sub-band; a continuous RB number of the UL sub-band; or a continuous RB number of a guard sub-band.
[0040] In some implementations of the method 300 and / or the method 400, the resource muting configuration is associated with at least one of a resource, a resource set, a transmission reception point (TRP) 208, a frequency layer, or a cell.
[0041] In some implementations of the method 300 and / or the method 400, the instruction includes a sub-band full duplex (SBFD) configuration of each cell or of each transmission reception point (TRP) 208.
[0042] In some implementations of the method 300 and / or the method 400, the receiving node reports a RS measurement with an indication that indicates whether the RS measurement is based on the reference signal only measured in a downlink (DL) sub-band in a slot or a symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0043] In some implementations of the method 300 and / or the method 400, wherein the receiving node reports a capability of the receiving node to make measurements on the RS only in a downlink (DL) sub-band in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0044] In some implementations of the method 300 and / or the method 400, wherein the receiving behavior includes that the receiving node does not receive and / or make measurements on the RS that occurs in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0045] In some implementations of the method 300 and / or the method 400, wherein the receiving behavior includes that the receiving node is only to receive and / or measure the RS that occurs in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol when an amount of available continuous resource blocks (RBs) of the RS occupies an equal to or larger than a predetermined percentage of a total configured bandwidth of the RS.
[0046] In some implementations of the method 300 and / or the method 400, the receiving behavior or the transmitting behavior includes that the receiving node is to only receive and / or measure a part of the RS that has a largest amount of continuous available resource blocks (RBs) .
[0047] In some implementations of the method 300 and / or the method 400, at least one of: the continuous available RBs are within an active bandwidth part (BWP) in the frequency domain or the continuous available RBs are not overlapped with the UL sub-band in the frequency domain.
[0048] In some implementations of the method 300 and / or the method 400, the receiving behavior or the transmitting behavior includes that the receiving node is not to receive the RS when a time gap between the RS and a scheduled UL transmission in the UL sub-band is smaller than a timing threshold.
[0049] In some implementations of the method 300 and / or the method 400, the RAN node 204 reports the instruction to a core network element 202.
[0050] In some implementations of the method 300 and / or the method 400, the RAN node 204 reports the instruction based on a request made by the core network element 202.
[0051] In some implementations of the method 300 and / or the method 400, the core network element 202 sends a message indicating the instruction to one or more transmitting RAN nodes 204.
[0052] In some implementations of the method 300 and / or the method 400, wherein a core network element 202 sends one or more resource muting configurations or a sub-band full duplex (SBFD) configuration of each cell or each transmission reception point (TRP) 208 to the RAN node 204, wherein the one or more resource muting configurations or the SBFD configuration of each cell or each TRP 208 belongs to another RAN node 204 rather than the RAN node 204.
[0053] Further details, any or all of which may be implemented in any of various embodiments of the method 300, the method 400, and / or other methods, are now described.
[0054] Sub-band full duplex (SBFD) is a technique in a TDD system, where a RAN node 204 may allocate frequency resources (e.g., an uplink (UL) sub-band) for an UL transmission inside a downlink (DL) carrier, and the RAN node 204 may schedule a user device 102 to transmit one or more UL reference signals or an UL data transmission in the UL sub-band. A time resource that can be allocated with the UL sub-band may be called or referred to as a SBFD symbol or a SBFD slot. Additionally, a SBFD configuration can be provided from RAN node 204 to a user device 102 to let the user device 102 know the time and frequency domain resource allocation of the UL sub-band in the DL carrier.
[0055] In some embodiments, a SBFD configuration may include at least one of: a SBFD time configuration or a SBFD frequency configuration.
[0056] Additionally, in some embodiments, a SBFD time configuration of each cell may include at least one of the following: a TDD pattern configuration of each cell; a SBFD slot bitmap, where each bit in the bitmap is associated with a slot and has a bit value of ‘0’ or ‘1’ to indicate whether or not the slot is a SBFD slot; a SBFD slot periodicity; a SBFD slot offset with respect to a TDD pattern periodicity or a SBFD slot periodicity; a SBFD symbol offset with respect to a SBFD slot offset; and / or a continuous slot or a continuous symbol in which an SBFD operation is performed.
[0057] Additionally, in some embodiments, a SBFD frequency configuration of each DL carrier may include at least one of the following: an offset to a carrier of the UL sub-band, where a unit for the offset may be a resource block (RB) ; a number of continuous RBs of the UL sub-band; or a number of continuous RBs of a guard band between the UL sub-band and the DL sub-band.
[0058] Additionally, in some situations, a receiving node may receive a RS in a guard band between an UL sub-band and a DL sub-band. In at least some of these situations, the DL sub-band includes the DL sub-band and the guard band. Additionally, in some other situations, the receiving node cannot receive the RS in the guard band between an UL sub-band and the DL sub-band. In at least some of these situations, the DL sub-band includes only the DL sub-band, and the UL sub-band includes the UL sub-band and the guard band. The various embodiments described herein may be applied to one or both of these situations.
[0059] Additionally, in some embodiments, a RAN node 204 may determine a TDD pattern per cell. In some of these embodiments, the TDD pattern includes a semi-static TDD pattern. The semi-static TDD pattern may be broadcasted in a cell. In this context, the semi-static TDD pattern is common for all user devices 102 accessing the cell. In addition or alternatively, a semi-static TDD pattern may include a periodicity of a DL-UL pattern, a number of DL slots and / or DL symbols in one periodicity, a number of UL slots and / or UL symbols in one periodicity, and / or one or more indications of time locations of DL slots / symbols and / or UL slot / symbols in one periodicity.
[0060] In addition, as used herein, a downlink reference signal (DL RS or DL-RS) refers to at least one of: a DL-positioning reference signal (PRS) , a sidelink (SL) -PRS, a synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) , a dedicated sensing RS, a channel state information (CSI) -RS, and / or a remote interference management (RIM) -RS. Additionally, a DL RS as used herein may be used for positioning, sensing usage, and / or radio resource management (RRM) measurement usage, in any of various embodiments.
[0061] In addition, as used herein, an uplink reference signal (UL RS or UL-RS) refers to at least one of: a preamble, a sounding reference signal (SRS) , a dedicated sensing RS, and / or a RIM-RS.
[0062] In addition, as used herein, a sensing mode refers to and / or includes at least one of the following.
[0063] A first mode (Mode 1) is a TRP monostatic mode, in which a RAN node 204 sends a sensing signal and the RAN node 204 itself receives a sensing signal. In other words, in the first mode, the transmitting sensing node is a RAN node 204 and the receiving sensing node or measuring sensing node is the same RAN node 204.
[0064] A second mode (Mode 2) is a TRP-TRP bistatic mode, in which a RAN node 204 sends a sensing signal and another RAN node 204 receives the sensing signal. In other words, in the second mode, the transmitting sensing node is a RAN node 204 and the receiving sensing node or measuring sensing node is another RAN node 204.
[0065] A third mode (Mode 3) is a TRP-UE bistatic mode, in which a RAN node 204 sends a sensing signal and a user device 102 receives the sensing signal. In other words, in the third mode, the transmitting sensing node is a RAN node 204 and the receiving sensing node or measuring sensing node is a user device 102.
[0066] A fourth mode (Mode 4) is a UE monostatic mode, in which a user device 102 sends a sensing signal and the user device 102 itself receives a sensing signal. In other words, in the fourth mode, the transmitting sensing node is a user deice 102 and the receiving sensing node or measuring sensing node is the same user device 102.
[0067] A fifth mode (Mode 5) is a UE-UE bistatic mode, in which a user device 102 sends a sensing signal and another user device 102 receives the sensing signal. In other words, in the fifth mode, the transmitting sensing node is a user device 102 and the receiving sensing node or measuring sensing node is another user device 102.
[0068] A sixth mode (Mode 6) is a UE-TRP bistatic mode, in which a user device 102 sends a sensing signal and a RAN node 204 receives a sensing signal. In other words, in the sixth mode, the transmitting sensing node is a user device 102 and the receiving sensing node or measuring sensing node is a RAN node 204.
[0069] Additionally, as used herein, a transmitting RAN node 204 may include a RAN node that transmits a DL RS to a receiving node. Also, as used herein, a receiving node may include a communication node that receives a DL RS from a transmitting RAN node 204. In any of various embodiments, a receiving node may be or include a user device 102 or a RAN node 204, as described in further detail below.
[0070] In some embodiments, including those involving wireless communication scenarios such as positioning and / or sensing, a transmitting RAN node 204 may determine to send a DL-RS to a user device 102. In response, the user device 102 may measure the DL-RS and report the measurement report to a network device 104. In other embodiments, a transmitting RAN node 204 may send a DL-RS to another RAN node 204. In response, the other RAN node 204 may measure the DL-RS and report or send a measurement report to a network device 104. In such embodiments, the receiving node may be at least one of the user device 102 or the another RAN node 104. In particular of these embodiments operating in a TDD system (e.g., the communication nodes are configured to communicate according to TDD) , in the time domain, the DL-RS may be sent on a DL slot or symbol or a flexible slot / symbol. In any of various embodiments, the DL-RS may be periodic, semi-persistent, or aperiodic in the time domain. Additionally, in any of various embodiments, in the frequency domain, the frequency range of the DL-RS may be configured within a DL carrier, but the DL-RS may be a wideband DL-RS and / or the DL-RS may not be configured within any DL bandwidth part (BWP) configured for wireless data communication.
[0071] Additionally, in some embodiments, when a transmitting RAN node 204 configures one or more UL sub-bands in a DL carrier, while in the same time (e.g., in the same SBFD symbol or SBFD slot) , the transmitting RAN node 204 sends the DL-RS in the DL carrier, and the frequency range of the DL-RS and the frequency range of the UL sub-band (s) overlap, the transmitting RAN node 204 may operate according to at least one of the following behaviors.
[0072] In a first behavior, the transmitting RAN node 204 may not configure and / or send a DL-RS on the SBFD symbol or slot. In this first behavior, the receiving node may skip the DL-RS reception in the overlapped symbol even if the DL-RS instance is periodically configured in the SBFD symbol or slot. FIG. 5 is a time-frequency plot illustrating an example of the first behavior.
[0073] In a second behavior, the transmitting RAN node 204 may send a DL-RS outside of the UL sub-band (e.g., in the DL sub-band, or in the DL sub-band and guard band) in the DL carrier, and may not send a DL-PRS in the UL sub-band in the DL carrier. For example, a wideband DL-RS may be non-continuous and be truncated in the frequency domain. In the second behavior, the receiving node may correctly receive and / or decode the DL-RS by knowing that the UL sub-band radio resources are skipped and no signals are on these resources (e.g., RBs) .
[0074] Additionally, some implementations of the second behavior may include one or more of the following aspects. In a first aspect of the second behavior, the transmitting RAN node 204 may allocate a DL-RS resource using a whole (or an entire) wideband as a frequency length, and may skip the UL sub-band radio resources when performing resource mapping. In a second aspect, a transmitting RAN node 204 may allocate a DL-RS resource using the frequency resources outside of the resources of the UL sub-band as the frequency length. As a result, there may be no need to skip the UL sub-band resources when performing resource mapping. FIG. 6 is a time-frequency plot illustrating an example of the second behavior.
[0075] In a third behavior, a RAN node 204 may send a DL-RS in the UL sub-band. In the third behavior, the RAN node 204 may allocate the DL-RS location and send the DL-RS resource regardless of the UL sub-band. In the third behavior, the receiving node may receive and measure the wideband DL-RS in the DL-RS instance. FIG. 7 is a time-frequency plot illustrating an example of the third behavior.
[0076] Additionally, in some implementations, the behavior of the RAN node 204 may be restricted when an overlap between a DL-RS and the UL sub-band occurs. For example, all of the RAN nodes may operate according to the same behavior in the event of overlaps between the SL-RS and the UL sub-band. In this way, the user device 102 or another RAN node 204 receiving the DL-RS may know for sure how to buffer, receive, and / or measure the DL-RS. In other implementations, including those where the positioning or sensing service has a different priority than the radio data scheduling, a RAN node 204 may independently select a behavior from a plurality of behavior (e.g., the above-described first behavior, second behavior, and third behavior) , such as without the selection being dependent on the behavior of one or more other RAN nodes. Correspondingly, in any of various implementations or situations, one RAN node 204 can operate according to different behaviors at different points in time, and / or different RAN nodes 204 can operate according to different behaviors at the same time or at different times. For at least some implementations, configuring the RAN nodes 204 to be able to independent select a behavior according to which to operate may provide the RAN nodes 204 with flexibility, including in situations or scenarios where the positioning or sensing service has a different priority than the radio data scheduling.
[0077] In addition, in some embodiments, after transmitting RAN node (s) decide the behavior for transmitting a DL-RS when there is overlapping between the DL-RS and UL sub-band, the receiving user device 102 and / or the receiving RAN node (s) may know the transmitting RAN node (s) 204 decision on the behavior for sending a DL-RS. Correspondingly, the core network element 202, one or more RAN nodes 204, and / or a receiving node may align their understanding of the behavior according to one of the following schemes.
[0078] In a first scheme, a transmitting RAN node 204 may report its determined behavior to the core network element 202. The report may indicate a slot or symbol where the DL-RS and UL sub-band has frequency overlapping, whether the transmitting RAN node 204 will drop the DL-RS it is sending, only send the DL-RS outside of the UL sub-band in the DL carrier, or will send the wideband DL-RS in the DL carrier regardless of the UL sub-band location in the DL carrier. Additionally, in some implementations of the first scheme, the core network element 202 may request the transmitting RAN node 204 to report the determined behavior to the core network element 202. In addition or alternatively, in some implementations, a network device 104 (e.g., the core network element 202) may indicate to the receiving node the behavior of the transmitting RAN node 204. For at least some of these embodiments, the receiving node is the node that is required to receive the DL-RS, e.g., for positioning or sensing.
[0079] In a second scheme, a transmitting RAN node 204 may use a criteria to determine its transmitting behavior, and the receiving RAN node 204 may use the same criteria to determine the transmitting RAN node’s behavior and in turn choose the same behavior for its corresponding reception. For example, a core network element 202 can indicate to a transmitting RAN node 204 a behavior that is recommended or requested. A network component (e.g., the core network element 202) may also indicate to a receiving node the behavior that is requested or recommended to the transmitting RAN node 204.
[0080] Additionally, in some embodiments when a transmitting RAN node 204 configures one or more UL sub-bands in a DL carrier, while in the same time (e.g., in the same SBFD symbol or SBFD slot) the transmitting RAN node 204 sends the DL-RS in this DL carrier, and the frequency range of the DL-RS and the frequency range of the UL sub-band (s) overlap, the RAN node 204 may not transmit the DL-RS on the whole or entire frequency resource in the overlapping symbol, as described for the first behavior. That is, one or more DL-RS instances on the overlapping symbol within a periodic DL-RS resource or within a repetition of a DL-RS resource may be muted. In such situations, a RAN node 204 may send signaling to a core network element 202 to indicate which DL-RS instance (s) is / are muted. For at least some of these embodiments, the signaling may include at least one of: a semi-static TDD pattern of each cell (or of each TRP 208) of the RAN node 204; and / or a SBFD configuration of each cell or (of each TRP 208) of the RAN node, which may include a SBFD time configuration. In addition, in some of these implementations, the core network element 202 may request a RAN node 204 to report the signaling.
[0081] Additionally, in some embodiments when a transmitting RAN node 204 configures an UL sub- bands in a DL carrier, while in the same time (e.g., in the same SBFD symbol or SBFD slot) the transmitting RAN node 204 sends the DL-RS in this DL carrier, and the frequency range of the DL-RS and the frequency range of the UL sub-band overlap, the RAN node 204 may not transmit the DL-RS in the UL sub-band, as described for the second behavior. In such implementations, the transmitting RAN node 204 may report muting information of at least one of a DL-RS resource, a DL-RS resource set, or a TRP 208, to the core network element 202. For at least some of these embodiments, muting information may include at least one of a time domain muting indication and / or a frequency domain muting indication.
[0082] For some embodiments, a time domain muting indication may include at least one of: a semi-static TDD pattern of each cell (or of each TRP 208) of the RAN node 204; a periodic or an aperiodic SBFD time pattern of each cell or (of each TRP 208) of the RAN node 204; a SBFD configuration of each cell or (of each TRP 208) of the RAN node 204; a muting periodicity (which may or may not be equal to a resource periodicity) ; a muting slot offset to indicate a starting slot of muting resource instances; a muting symbol offset to indicate the start symbol of muting resource instances; a number of muted symbols to indicate continuous muting symbols of the resource instance; a muting repetition factor to indicate the number of continuous muting instances of a resource; and / or a muting bitmap, where each bit corresponds to respective resource instance and includes a bit value of ‘0’ or ‘1’ to indicate whether or not the corresponding resource instance is to be muted.
[0083] In addition or alternatively, for some embodiments, a frequency domain muting indication may include at least one of: a resource block (RB) start position of the UL sub-band (which may be configured per each DL RS resource, DL RS resource set, frequency layer, or TRP 208) ; a continuous RB number of the UL sub-band (which may be configured per each DL RS resource, DL RS resource set, frequency layer, or TRP 208) ; or continuous RB number of a guard sub-band (which may be configured per each DL RS resource, DL RS resource set, frequency layer, or TRP 208) .
[0084] In any of various embodiments, the above-described muting information may also be at least a part of or included in a SBFD configuration of each cell of a RAN node 204. In addition or alternatively, in any of various embodiments, the core network element 202 may request a RAN node 204 to report the muting information.
[0085] Additionally, in some embodiments for a positioning or a sensing service, it is possible that a core network element 202 sends a RS configuration to a receiving node. The receiving node may be scheduled to receive and measure the RS for positioning or sensing according to the received RS configuration, and report the measurements. For at least some of these embodiments, the network, e.g., the core network element 202, may send the RS muting information to the receiving node. In addition or alternatively, the RS muting information may be gathered or obtained by the core network element 202 from one or more RAN nodes 204.
[0086] Additionally, in some embodiments, the RS muting information may include resource level muting information. In some implementations, the resource level muting information may be configured among all of the DL RS resources of a receiving node, in which case there may be one or more sets of resource level muting information configured for a receiving node, or the resource level muting information may be associated with each configured DL RS resource. In addition or alternatively, the resource level muting information may include at least one of the following parameters: a muting periodicity (which may be or may not be equal to a resource periodicity) ; a muting slot offset to indicate a starting slot of muting resource instances; a muting symbol offset to indicate a start symbol of muting resource instances; a number of muted symbols to indicate continuous muting symbols of the resource instance; a muting repetition factor to indicate the number of continuous muting instances of a resource; and / or a muting bitmap where each bit corresponds to a respective resource instance and includes a bit value of ‘0’ or ‘1’ 0 to indicate whether or not the corresponding resource instance is to be muted.
[0087] In addition or alternatively, in some implementations, the RS muting information may include RB set level muting information. For at least some implementations, RB set level muting information may be configured together with the resource level muting information. In addition or alternatively, one or more sets of RB set level muting information may be configured in situations where there is more than one UL sub-band in one DL carrier. In addition or alternatively, in some implementations, a RB set level muting information may include at least one of the following configuration parameters: a RB start position of the UL sub-band (which may be configured per each DL RS resource, DL RS resource set, frequency layer, or TRP 208) ; a continuous RB number of the UL sub-band (which may be configured per each DL RS resource, DL RS resource set, frequency layer, or TRP 208) ; and / or a continuous RB number of a guard sub-band (which may be configured per each DL RS resource, DL RS resource set, frequency layer, or TRP 208) .
[0088] In addition or alternatively, in some embodiments, the receiving node may receive (including actually receive) and / or measure the intersection set of a muting pattern and a configured DL RS pattern. For at least some of these embodiments, the muting pattern may include at least one of: a frequency layer level muting pattern, a TRP or cell level muting pattern, a resource set level muting pattern, resource level muting information, and / or RB set level muting information.
[0089] In addition or alternatively, in some embodiments, the RS muting information may be a SBFD configuration per cell, per TRP, or per RAN node, and / or the RS muting information of different cells, TRPs or RAN nodes may be provided from the core network element 202 to the receiving node. In such embodiments, the network (e.g., the core network element 202) may directly notify the receiving node of the SBFD configuration of different cells, different TRPs, or different transmitting RAN nodes. Additionally, in at least some of these embodiments where the receiving node is a user device 102, the RS muting information of different cells, TRPs 208, or RAN nodes 204 may be provided from a serving gNB, a serving cell, or a camping cell to a user device 102 via radio resource control (RRC) dedicated or broadcast signaling.
[0090] Additionally, in some embodiments, one DL RS resource may be configured with a periodicity and / or a certain number of repetitions. For at least some of these embodiments, one DL RS resource set may include one or more DL RS resources. In addition or alternatively, for at least some of these embodiments, when a receiving node performs positioning measurement or sensing measurement, the receiving node may use one or more samples or instances of a DL RS’s measurement to generate a single measurement for the DL RS resource (e.g., using a mathematical operation such as averaging for example) , and report the single measurement to the core network element 202. However, in a DL TDD carrier and in one or more particular slots or symbols, when the frequency range of one or more samples or instances within one DL RS resource overlaps with the cell’s UL subband (s) , the receiving node may only receive a part of the DL RS in the frequency domain in these overlapping slots or symbols instead of the full wideband DL RS, which may cause inaccurate measurements of or related to timing, angle, reference signal received power (RSRP) , reference signal received power per path (RSRPP) , phase, Doppler, and / or velocity. For at least some of these embodiments, if a receiving node generates a single measurement by utilizing measurement (s) from a wide-band DL RS and measurement (s) from part of a DL RS, the quality of this generated single measurement may indicate performance loss, and in turn and may not satisfy quality of service (QoS) requirements of this service at least because the two kinds of measurements have different bandwidths. As such, when the receiving node is to generate a single measurement, the receiving node may not mix the two kinds of measurements of a DL RS resource or a DL RS resource set together. Further, in event that a core network element 202 or other communication node that is responsible for calculating a positioning / sensing result is able to know which measurement is generated based on a wideband RS and which measurement is generated based on a measurement that may have performance loss, the core network element 202 or other communication node that is responsible for making the positioning / sensing result calculation may make a better or more accurate calculation by not mixing the two kinds of measurements together in one set of calculation operations or equations. In this way, the quality of a location or sensing calculation may be improved.
[0091] The following describes ways the core network element 202 or other communication node responsible for performing a positioning and / or sensing result calculation may differentiate the two kinds of measurement.
[0092] In a first way, the receiving node may report two groups of measurements. A first group may include one or more measurements that are generated using wide-band DL RS. A second group may include measurements that are generated using a measurement from an overlapping slot or symbol, i.e., non-wide-band DL RS. Further, in some embodiments of the first way, each group may include a group identification (ID) . In addition or alternatively, the report including the two groups may be sent to the core network element 202, a RAN node 104, and / or a user device 102. In addition or alternatively, the core network element 202, the RAN node 204, and / or the user device 102 may request to receive the report in advance.
[0093] In a second way, the receiving node may report each measurement with an indication indicating whether the measurement is based on a wide-band DL RS or a non-wide-band DL RS in the overlapping symbol or symbol. In at least some implementations of the second way, the report may be sent to the core network element 202, a RAN node 204, or a user device 102. In addition or alternatively, the core network element 202, the RAN node 204, and / or the user device 102 may request to receive the report in advance.
[0094] In a third way, RAN nodes 204 may report an association or relationship between an ID of the transmitted DL RS, a timestamp of transmitting, and the DL RS muting configuration in the last time period, to the core network element 202. In at least some implementations of the third way, the core network element 202 may request to receive the report in advance. In addition or alternatively, the report may be a one-shot report (i.e., a single report transmitted only once) or a periodic report. For at least some implementations where the report is a periodic report, a reporting periodicity may be configured from the core network element 202 to the RAN nodes 204.
[0095] In addition or alternatively, in some embodiments, a receiving node may report whether it has the capability to make at least one of the following types of measurements based on the (buffered) non-wide-band DL RS: angle of arrival (AoA) , time of arrival (TOA) , relative time of arrival (RTOA) , reference signal received power (RSRP) , RSRPP, received signal strength indicator (RSSI) , reference signal timing difference (RSTD) , Doppler time shift, Doppler frequency, velocity, Doppler velocity, Doppler frequency shift, reference signal received quality (RSRQ) , signal to interference plus noise ratio (SINR) , reference signal carrier phase (RSCP) , reference signal carrier phase difference (RSCPD) , and / or receive (Rx) transmit (Tx) time difference.
[0096] Additionally, in some embodiments, a gNB 206 may configure a positioning reference signal (PRS) processing window for a user device 102. A PRS processing window is a time window with a configured periodicity and duration. In at least some of these embodiments, a user device 102 may receive a DL PRS outside of a measurement gap but within the PRS processing window. However, the user device 102 may only receive the DL PRS that is overlapped with user device’s 102 current active DL BWP and the DL PRS that has the same sub-carrier spacing (SCS) as the user device’s current active DL BWP. In this case, if one or more resource blocks (RBs) in the frequency domain are configured as a UL sub-band within this active DL BWP and the UL sub-band overlaps with the DL PRS in the active BWP, and the gNB 206 does not transmit a DL PRS on these one or more RBs, the available frequency of the DL PRS may be even less, resulting in a measurement of a narrow-band DL PRS that may suffer from additional performance loss.
[0097] FIG. 8 is a time-frequency plot illustrating an example where a RS is cut off by a UL sub-band and active DL BWP.
[0098] In other embodiments, in event multiple (more than one) UL sub-bands are configured inside a DL carrier, the DL RS in the DL carrier may be cut off by different UL sub-bands, which may result in even further reducing the available frequency for the DL RS, in turn causing the measurement of the narrow-band DL RS to suffer further performance loss.
[0099] In some embodiments, a receiving node’s behavior may be restricted to mitigate possible performance loss according to at least one of the following ways.
[0100] In a first way, the receiving node may not receive and / or make measurements on a DL RS instance that occurs in a frequency-overlapping symbol or slot.
[0101] In a second way, the receiving node may only receive the DL RS in an overlapping symbol or slot when an amount of available continuous RBs of the DL RS instance occupies a bandwidth that is equal to or larger than a certain or predetermined X%of a total configured bandwidth of the DL RS.
[0102] In a third way, if the DL RS instance is cut by an active DL BWP and / or one or more UL subbands into several parts in the frequency domain, the receiving node may only receive and / or measure the part of DL RS that has largest available continuous RBs. As used herein, a RB is an available RB where the RB is within a DL active BWP but not within an UL sub-band, or the RB is not within any UL sub-bands.
[0103] Additionally, in any of various embodiments, the receiving node may implement the first, second, and / or third way according to an indication by the network and / or by a specification or protocol according to which communication nodes in the wireless communication system 100 operate and / or communicate.
[0104] Additionally, in some embodiments, the receiving node may not receive the DL RS instance when the time gap between the DL RS instance and a scheduled UL transmission in the UL sub-band is smaller than a timing threshold. In some of these embodiments where the receiving node is a user device 102, the timing threshold may depend on a capability reporting of the user device 102, be indicated by the network device, or specified by a specification or protocol according to which communication nodes in the wireless communication system 100 operate and / or communicate.
[0105] Additionally, in some embodiments, a RAN node 204 may schedule a user device 102 to transmit a sounding reference signal (SRS) and / or a SRS for positioning in user device’s 102 connected (e.g., RRC-CONNECTED) state. In particular of these embodiments, the SRS transmission may be used to measure cross link interference (CLI) and / or interference caused by SBFD. In addition or alternatively, in some of these embodiments, a RAN node 204 may perform at least one of the following. The RAN node 204 may include an indication signaling in a SRS configuration to indicate whether the SRS configuration may be applied to a UL sub-band of a DL carrier or of a current serving cell. The RAN node 204 may include a SBFD configuration in a SRS configuration, and further, include a SBFD frequency configuration in the SRS configuration. The RAN node 204 may include a SRS configuration dedicated for an UL sub-band into a serving cell configuration.
[0106] Additionally, in some embodiments, a user device 102 may not expect to transmit a SRS resource or a SRS resource for positioning to cross a SBFD symbol and a non SBFD symbol.
[0107] Additionally, in some embodiments, in order to measure CLI or interference caused by SBFD, the core network element 202 can request a RAN node 204 to configure an UL RS in the UL sub-band in a DL carrier. In turn, the RAN node 204 may respond to the core network element 202 that the dedicated SRS configuration is in or applied to the UL sub-band.
[0108] Additionally, in some embodiments when a serving RAN node 204 configures a SRS for a user device 102 for positioning or sensing usage on the UL sub-band, the SRS may be received by multiple RAN nodes 204. In at least some of these embodiments, a corresponding SRS resource of the serving RAN node 204 and neighbor RAN nodes 204 may both include the UL sub-band in the SRS transmission time. However, the serving gNB 206 may not know which other gNBs 206 will also receive the SRS, and in turn, that serving gNB 206 may not know with which gNB 206 to coordinate about the SBFD configurations. The following are ways a gNB 206 may know with which gNBs 206 to coordinate about SBFD configurations.
[0109] In a first way, the RAN nodes 204 may send their respective SBFD configurations per cell or per TRP 208 to the core network element 202. In turn, the core network element 202 may send the SBFD configuration of the RAN nodes 204 to the transmitting RAN node 204 that is to transmit DL RS. In this way, the transmitting RAN node 205 may know the other adjacent RAN nodes’ 204 SBFD configuration, and as a result can make improved decisions about radio resource allocation for transmitting SRSs, such as by allocating the SRS to the UL sub-band that belongs to both the transmitting RAN node’s 204 and the receiving RAN node’s 204 UL sub-band.
[0110] In a second way, the core network element 202 may recommend a suitable SBFD configuration to RAN nodes 204. For example, a transmitting RAN node 204 may send a configured or allocated sensing signal configuration to the core network element 202. In response, the core network may recommend a suitable SBFD configuration to other RAN nodes 204 that are to receive a SRS. For example, a core network element 202 may recommend a suitable SBFD configuration that is to ensure enough SRS reception opportunities.
[0111] In addition, in some embodiments, a maximum transmission power of a user device 102 on the UL sub-band in the DL carrier may be defined.
[0112] Additionally, in some embodiments, for UL and / or DL data transmission and scheduling, in situations where adjacent cells (or adjacent TRPs 208 or adjacent RAN nodes 204) have different TDD patterns, a DL transmission in one cell may interfere with UL transmissions in other cells at the same timestamp, which is called or referred to herein as cross link interference (CLI) . To illustrate, suppose two adjacent RAN nodes 104, including RAN node1 and RAN node2, are both in a TDD system and have their own TDD pattern. Further, suppose that RAN node1 and RAN node2 perform respective sensing using sensing mode 2, and that RAN node1 sends a sensing signal and RAN node2 receives a sensing signal within the same symbol. In turn, when RAN node1 204 sends a sensing signal at a first TRP’s (TRP1) DL symbol, if RAN node2 204 receives a sensing signal at RAN node2’s UL symbol, such occurrence may cause interference with RAN node2’s UL data reception. To avoid such interference, RAN node2 may receive RAN node1’s sensing signal on RAN node2’s DL symbol. However, in some of these situations, RAN node1 and RAN node2 may be scheduled by the core network element 202 to transmit a sensing signal and a receive sensing signal, respectively. In such situations, when RAN node1 allocates a radio resource for transmitting the sensing signal, RAN node1 may not know which TRP 208 is to receive the sensing signal and in turn may not know the receiving RAN node’s TDD pattern. Consequently, RAN node1 may not allocate proper radio resources for the sensing signal (e.g., by allocating to the symbol that belongs to both RAN node1 and RAN node2’s DL symbol) to avoid interference.
[0113] The following describes ways to enable proper allocation of radio resources to avoid or minimize interference.
[0114] In a first way, the RAN nodes 204 may send their respective TDD pattern configurations per cell or per TRP 208 to the core network element 202. In turn, the core network element 202 may send the TDD pattern configuration of all of the RAN nodes 204 to the transmitting RAN node 204 that is to transmit reference signals. In this way, the transmitting RAN node 204 may know all other adjacent RAN nodes’ 204 TDD pattern configuration, and in turn and can make optimal or betters decisions for radio resource allocation for transmitting reference signals, such as by allocating to the symbol that belongs to both transmitting RAN node’s 204 and receiving RAN node’s 204 DL symbol.
[0115] In a second way, the transmitting RAN node 204 may send a configured or allocated sensing signal configuration to the core network element 202. In turn, the core network element 202 may recommend a suitable TDD pattern to other RAN nodes 204 that are to receive the sensing signal. In some of these embodiments, the core network element 202 may recommend a suitable TDD pattern that will not cause CLI between a transmitting RAN node 204 and a receiving RAN node 204.
[0116] The description and accompanying drawings above provide specific example embodiments and implementations. The described subject matter may, however, be embodied in a variety of different forms and, therefore, covered or claimed subject matter is intended to be construed as not being limited to any example embodiments set forth herein. A reasonably broad scope for claimed or covered subject matter is intended. Among other things, for example, subject matter may be embodied as methods, devices, components, systems, or non-transitory computer-readable media for storing computer codes. Accordingly, embodiments may, for example, take the form of hardware, software, firmware, storage media or any combination thereof. For example, the method embodiments described above may be implemented by components, devices, or systems including memory and processors by executing computer codes stored in the memory.
[0117] Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment / implementation” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment / implementation” as used herein does not necessarily refer to a different embodiment. It is intended, for example, that claimed subject matter includes combinations of example embodiments in whole or in part.
[0118] In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and” , “or” , or “and / or, ” as used herein may include a variety of meanings that may depend at least in part on the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a, ” “an, ” or “the, ” may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.
[0119] Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized with the present solution should be or are included in any single implementation thereof. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussions of the features and advantages, and similar language, throughout the specification may, but do not necessarily, refer to the same embodiment.
[0120] Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.
[0121] The subject matter of the disclosure may also relate to or include, among others, the following aspects:
[0122] A first aspect includes a method for wireless communication that includes: determining, by a receiving node, a receiving behavior indicating how the receiving node is to receive a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol; and receiving, by the receiving node, the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol from a radio access network (RAN) node according to the receiving behavior.
[0123] A second aspect includes a method for wireless communication that includes: determining, by a radio access network (RAN) node, a transmitting behavior indicating how to transmit a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol; and transmitting, by the RAN node, the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol to a receiving node according to the transmitting behavior.
[0124] A third aspect includes any of the first aspect or the second aspect, and further includes wherein the receiving node determines the receiving behavior or the transmitting behavior based on an instruction received from at least one network device, wherein the at least one network device comprises at least one of a core network element or the RAN node.
[0125] A fourth aspect includes the third aspect, and further includes wherein the instruction comprises at least one of: the RS is not transmitted in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol; the RS is only transmitted in a downlink (DL) sub-band over the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol; or the RS is transmitted in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0126] A fifth aspect includes the third aspect, and further includes wherein the instruction comprises a resource muting configuration, wherein the resource muting configuration comprises at least one of a resource time muting configuration or a resource frequency muting configuration.
[0127] A sixth aspect includes the fifth aspect, and further includes wherein the resource time muting configuration comprises at least one of: a time division duplex (TDD) pattern of each cell or each transmission reception point (TRP) of the RAN node; a periodic or an aperiodic sub-band full duplex (SBFD) time pattern of each cell or each TRP of the RAN node; a SBFD configuration of each cell or each TRP of the RAN node; a muting periodicity that is equal or not equal to a resource periodicity; a muting slot offset that indicates a starting slot of one or more muting resource instances; a muting symbol offset that indicates a starting symbol of one or more muting resource instances; a number of muted symbols that indicates one or more continuous muting symbols of one or more muting resource instances; a muting repetition factor that indicates a number of continuous muting instances of a resource; or a muting bitmap utilizing a predetermined bit value to indicate which of one or more resource instances are to be muted.
[0128] A seventh aspect includes any of the fifth or sixth aspects, and further includes wherein the resource frequency muting configuration comprises at least one of: a resource block (RB) start position of the UL sub-band; a continuous RB number of the UL sub-band; or a continuous RB number of a guard sub-band.
[0129] An eight aspect includes any of the fifth through seventh aspects, and further includes wherein the resource muting configuration is associated with at least one of a resource, a resource set, a transmission reception point (TRP) , a frequency layer, or a cell.
[0130] A ninth aspect includes the third aspect, and further includes wherein the instruction comprises a sub-band full duplex (SBFD) configuration of each cell or of each transmission reception point (TRP) .
[0131] A tenth aspect includes any of the first through ninth aspects, and further includes wherein the receiving node reports a RS measurement with an indication that indicates whether the RS measurement is based on the reference signal only measured in a downlink (DL) sub-band in a slot or a symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0132] An eleventh aspect includes any of the first through tenth aspects, and further includes wherein the receiving node reports a capability of the receiving node to make measurements on the RS only in a downlink (DL) sub-band in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0133] A twelfth aspect includes the first aspect, and further includes wherein the receiving behavior comprises that the receiving node does not receive and / or make measurements on the RS that occurs in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.
[0134] A thirteenth aspect includes the first aspect, and further includes wherein the receiving behavior comprises that the receiving node is only to receive and / or measure the RS that occurs in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol when an amount of available continuous resource blocks (RBs) of the RS occupies an equal to or larger than a predetermined percentage of a total configured bandwidth of the RS.
[0135] A fourteenth aspect includes any of the thirteenth or fourteenth aspects, and further includes wherein the receiving behavior or the transmitting behavior comprises that the receiving node is to only receive and / or measure a part of the RS that has a largest amount of available continuous resource blocks (RBs) .
[0136] A fifteenth aspect includes any of the thirteenth or fourteenth aspects, and further includes wherein at least one of: the available continuous RBs are within an active bandwidth part (BWP) in the frequency domain or the available continuous RBs are not overlapped with the UL sub-band in the frequency domain.
[0137] A sixteenth aspect includes any of the first or second aspects, and further includes wherein the receiving behavior or the transmitting behavior comprises that the receiving node is not to receive the RS when a time gap between the RS and a scheduled UL transmission in the UL sub-band is smaller than a timing threshold.
[0138] A seventeenth aspect includes the third aspect, and further includes wherein the RAN node reports the instruction to a core network element.
[0139] An eighteenth aspect includes the seventeenth aspect, and further includes wherein the RAN node reports the instruction based on a request made by the core network element.
[0140] A nineteenth aspect includes the eighteenth aspect, and further includes wherein the core network element sends a message indicating the instruction to one or more transmitting RAN nodes.
[0141] A twentieth aspect includes any of the eighteenth or nineteenth aspects, and further includes wherein a core network element sends one or more resource muting configurations or a sub-band full duplex (SBFD) configuration of each cell or each transmission reception point (TRP) to the RAN node, wherein the one or more resource muting configurations or the SBFD configuration of each cell or each TRP belongs to another RAN node rather than the RAN node.
[0142] A twenty-first aspect includes a wireless communications apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory to implement any of the first through twentieth aspects.
[0143] A twenty-second aspect includes a computer program product including a computer-readable program medium comprising code stored thereupon, the code, when executed by a processor, causing the processor to implement any of the first through twentieth aspects.
[0144] In addition to the features mentioned in each of the independent aspects enumerated above, some examples may show, alone or in combination, the optional features mentioned in the dependent aspects and / or as disclosed in the description above and shown in the figures.
Claims
1.A method for wireless communication, the method comprising:determining, by a receiving node, a receiving behavior indicating how the receiving node is to receive a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol; andreceiving, by the receiving node, the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol from a radio access network (RAN) node according to the receiving behavior.2.A method for wireless communication, the method comprising:determining, by a radio access network (RAN) node, a transmitting behavior indicating how to transmit a reference signal (RS) in a slot or a symbol when the RS overlaps with an uplink (UL) sub-band in a frequency domain over the slot or the symbol; andtransmitting, by the RAN node, the RS overlapping with the UL sub-band in the frequency domain over the slot or the symbol to a receiving node according to the transmitting behavior.3.The method of claim 1, wherein the receiving node determines the receiving behavior based on an instruction received from at least one network device, wherein the at least one network device comprises at least one of a core network element or the RAN node.4.The method of claim 3, wherein the instruction comprises at least one of:the RS is not transmitted in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol;the RS is only transmitted in a downlink (DL) sub-band over the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol; orthe RS is transmitted in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.5.The method of claim 3, wherein the instruction comprises a resource muting configuration, wherein the resource muting configuration comprises at least one of a resource time muting configuration or a resource frequency muting configuration.6.The method of claim 5, wherein the resource time muting configuration comprises at least one of:a time division duplex (TDD) pattern of each cell or each transmission reception point (TRP) of the RAN node;a periodic or an aperiodic sub-band full duplex (SBFD) time pattern of each cell or each TRP of the RAN node;a SBFD configuration of each cell or each TRP of the RAN node;a muting periodicity that is equal or not equal to a resource periodicity;a muting slot offset that indicates a starting slot of one or more muting resource instances;a muting symbol offset that indicates a starting symbol of one or more muting resource instances;a number of muted symbols that indicates one or more continuous muting symbols of one or more muting resource instances;a muting repetition factor that indicates a number of continuous muting instances of a resource; ora muting bitmap utilizing a predetermined bit value to indicate which of one or more resource instances are to be muted.7.The method of claim 5, wherein the resource frequency muting configuration comprises at least one of:a resource block (RB) start position of the UL sub-band;a continuous RB number of the UL sub-band; ora continuous RB number of a guard sub-band.8.The method of claim 5, wherein the resource muting configuration is associated with at least one of a resource, a resource set, a transmission reception point (TRP) , a frequency layer, or a cell.9.The method of claim 3, wherein the instruction comprises a sub-band full duplex (SBFD) configuration of each cell or of each transmission reception point (TRP) .10.The method of claim 1 or 2, wherein the receiving node reports a RS measurement with an indication that indicates whether the RS measurement is based on the reference signal only measured in a downlink (DL) sub-band in a slot or a symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.11.The method of claim 1 or 2, wherein the receiving node reports a capability of the receiving node to make measurements on the RS only in a downlink (DL) sub-band in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.12.The method of claim 1, wherein the receiving behavior comprises that the receiving node does not receive and / or make measurements on the RS that occurs in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol.13.The method of claim 1, wherein the receiving behavior comprises that the receiving node is only to receive and / or measure the RS that occurs in the slot or the symbol when the RS is overlapped with the UL sub-band in the frequency domain over the slot or the symbol when an amount of available continuous resource blocks (RBs) of the RS occupies an equal to or larger than a predetermined percentage of a total configured bandwidth of the RS.14.The method of claim 1 or 2, wherein the receiving behavior or the transmitting behavior comprises that the receiving node is to only receive and / or measure a part of the RS that has a largest amount of available continuous resource blocks (RBs) .15.The method of claim 13 or 14, wherein at least one of: the available continuous RBs are within an active bandwidth part (BWP) in the frequency domain or the available continuous RBs are not overlapped with the UL sub-band in the frequency domain.16.The method of claim 1 or 2, wherein the receiving behavior or the transmitting behavior comprises that the receiving node is not to receive the RS when a time gap between the RS and a scheduled UL transmission in the UL sub-band is smaller than a timing threshold.17.The method of claim 3, wherein the RAN node reports the instruction to a core network element.18.The method of claim 17, wherein the RAN node reports the instruction based on a request made by the core network element.19.The method of claim 18, wherein the core network element sends a message indicating the instruction to one or more transmitting RAN nodes.20.The method of claim 18, wherein a core network element sends one or more resource muting configurations or a sub-band full duplex (SBFD) configuration of each cell or each transmission reception point (TRP) to the RAN node, wherein the one or more resource muting configurations or the SBFD configuration of each cell or each TRP belongs to another RAN node rather than the RAN node.21.A wireless communications apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory to implement a method of any of claims 1 to 20.22.A computer program product comprising a computer-readable program medium comprising code stored thereupon, the code, when executed by a processor, causing the processor to implement a method of any of claims 1 to 20.
Citation Information
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