Methods, devices, and systems for resolving cross link interference in subband full duplex technique
L1 CLI measurements with and without gaps address CLI issues in SBFD, enhancing UL capacity and coverage in TDD systems by reporting CLI results and using SRS resources, thus improving wireless communication efficiency and performance.
Patent Information
- Application Number
- PCT/CN2024/109974
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-07-17
AI Technical Summary
Cross link interference (CLI) occurs in subband full duplex (SBFD) techniques, degrading wireless communication performance by interfering uplink (UL) transmissions with downlink (DL) receptions, particularly in time division duplex (TDD) systems, leading to reduced UL capacity and coverage.
Implementing layer 1 (L1) CLI measurements with and without measurement gaps, allowing UEs to report CLI measurement results to the radio access network (RAN) node, and configuring UEs to perform CLI measurements using sounding reference signals (SRS) and CLI-RSSI resources, with options for gap-assisted and non-gap-assisted methods.
Enhances UL capacity and coverage by mitigating CLI, improving the efficiency and performance of SBFD techniques in wireless communication systems.
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Figure CN2024109974_17072025_PF_FP_ABST
Abstract
Description
METHODS, DEVICES, AND SYSTEMS FOR RESOLVING CROSS LINK INTERFERENCE IN SUBBAND FULL DUPLEX TECHNIQUETECHNICAL FIELD
[0001] The present disclosure is directed generally to wireless communications. Particularly, the present disclosure relates to methods, devices, and systems for resolving cross link interference (CLI) in a subband full duplex (SBFD) technique.BACKGROUND
[0002] Wireless communication technologies are moving the world toward an increasingly connected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user equipment and wireless access network nodes (including but not limited to base stations) . A new generation network is expected to provide high speed, low latency and ultra-reliable communication capabilities and fulfill the requirements from different industries and users.
[0003] In some implementations, a subband full duplex (SBFD) technique may be implemented in a time division duplex (TDD) wireless communication system. A radio access network (RAN) node may allocate some frequency resources as a uplink (UL) subband for UL transmission inside a downlink (DL) carrier. The RAN node may schedule a user equipment (UE) to transmit UL reference signals or UL data transmission in the UL subband within the DL carrier. The implementation has the potential of increasing UL capacity and UL coverage and reducing the UL transmission latency. However, there may be various problems / issues associated with such implementations. For example, when SBFD is applied, cross link interference (CLI) may occur, since an aggressor UE who transmits UL transmission in the UL subband may interfere a victim UE’s DL reception in the same carrier at the same time; and CLI may impose serious problem in wireless communication systems, degrading the performance of wireless communication.
[0004] The present disclosure describes various embodiments for resolving CLI in the SBFD technique, addressing at least one of the issues / problems discussed in the present disclosure, increasing efficiency of the SBFD technique, increasing performance of wireless communication, and / or improving the field of telecommunication.SUMMARY
[0005] This document relates to methods, systems, and devices for wireless communication, and more specifically, for resolving cross link interference (CLI) in a subband full duplex (SBFD) technique. The various embodiments in the present disclosure may be beneficial to enhance efficiency of the SBFD technique, increase the overall transmission efficiency and speed, and / or boost performance of the wireless communication.
[0006] In one embodiment, the present disclosure describes a method for wireless communication, performed by a wireless communication device. The method includes receiving, by a user equipment (UE) from a base station, a layer 1 (L1) cross link interference (CLI) measurement configuration; determining, by the UE, whether the UE needs a measurement gap for a L1 CLI measurement, and performing, by the UE, the L1 CLI measurement. In some implementations, the L1 CLI measurement is performed by the UE with the measurement gap or without the measurement gap.
[0007] In one embodiment, the present disclosure describes another method for wireless communication, performed by a wireless communication node. The method includes sending, by a base station to a user equipment (UE) , a L1 CLI measurement configuration, and receiving, by the base station from the UE, a L1 CLI measurement result of a L1 CLI measurement performed by the UE.
[0008] In some other embodiments, an apparatus for wireless communication may include a memory storing instructions and at least one processing circuitry in communication with the memory. When the at least one processing circuitry executes the instructions, the at least one processing circuitry is configured to carry out the above methods.
[0009] In some other embodiments, a device for wireless communication may include a memory storing instructions and at least one processing circuitry in communication with the memory. When the at least one processing circuitry executes the instructions, the at least one processing circuitry is configured to carry out the above methods.
[0010] In some other embodiments, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the above methods. The computer-readable medium may be a non-transitory computer-readable medium.
[0011] 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
[0012] FIG. 1A shows an example of a wireless communication system include one wireless network node and one or more user equipment.
[0013] FIG. 1B shows one exemplary configuration pattern of an uplink (UL) subband in the present disclosure.
[0014] FIG. 1C shows another exemplary configuration pattern of a UL subband in the present disclosure.
[0015] FIG. 1D shows another exemplary configuration pattern of a UL subband in the present disclosure.
[0016] FIG. 2 shows an example of a network node.
[0017] FIG. 3 shows an example of a user equipment.
[0018] FIG. 4A shows a flow diagram of a method for wireless communication.
[0019] FIG. 4B shows a flow diagram of another method for wireless communication.DETAILED DESCRIPTION
[0020] The present disclosure will now be described in detail hereinafter with reference to the accompanied drawings, which form a part of the present disclosure, and which show, by way of illustration, specific examples of embodiments. Please note that the present disclosure may, however, be embodied in a variety of different forms and, therefore, the covered or claimed subject matter is intended to be construed as not being limited to any of the embodiments to be set forth below.
[0021] 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” or “in some embodiments” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment” or “in other embodiments” as used herein does not necessarily refer to a different embodiment. The phrase “in one implementation” or “in some implementations” as used herein does not necessarily refer to the same implementation and the phrase “in another implementation” or “in other implementations” as used herein does not necessarily refer to a different implementation. It is intended, for example, that claimed subject matter includes combinations of exemplary embodiments or implementations in whole or in part.
[0022] 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 upon 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” or “at least one” 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” , again, 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” or “determined by” 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.
[0023] The present disclosure describes methods and devices for resolving cross link interference (CLI) in a subband full duplex (SBFD) technique.
[0024] The 5th Generation mobile communication technology (5G) or further 6th Generation mobile communication technology (6G) face more and more demands. Based on the current development trend, 5G systems are developing supports on features of enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , and massive machine-type communication (mMTC) . Optionally, Artificial Intelligence / Machine Learning (AI / ML) can be used in 5G, 6G or further wireless communication system to improve the efficiency of communication system.
[0025] In some implementations, a subband full duplex (SBFD) technique may be implemented in a time division duplex (TDD) wireless communication system. A radio access network (RAN) node may allocate some frequency resources as a uplink (UL) subband for UL transmission inside a downlink (DL) carrier. The RAN node may schedule a user equipment (UE) to transmit UL reference signals or UL data transmission in the UL subband within the DL carrier. The implementation has the potential of increasing UL capacity and UL coverage and reducing the UL transmission latency. However, there may be various problems / issues associated with such implementations. For example, when SBFD is applied, cross link interference (CLI) may occur, since an aggressor UE who transmits UL transmission in the UL subband may interfere a victim UE’s DL reception in the same carrier at the same time; and CLI may impose serious problem in wireless communication systems, degrading the performance of wireless communication.
[0026] In some implementations, CLI may refer to a UE-to-UE CLI, wherein one UE’s (referred as aggressor UE) UL transmission may interfere another UE’s (referred as victim UE) DL reception. The aggressor UE and the victim UE may be within one same cell or within two different cells which are neighbors.
[0027] In some implementations, the UE-to-UE CLI may happen when a SBFD technique is enabled, for example, one UE (UE1, also referred as aggressor UE) may transmit UL transmission in a UL subband in a DL carrier; and another UE (UE2, also referred as victim UE) may receive DL reception in the same DL carrier at the same time. When the UE1 and the UE2 are close to each other, the UE2’s DL reception may be interfered by the UE1’s UL transmission.
[0028] In some implementations, the UE-to-UE CLI may happen when different TDD DL / UL patterns are used between neighboring cells, and the UL transmission in one cell may interfere with the DL reception in another cell.
[0029] The present disclosure describes various embodiments for solving CLI problems. In some implementations, to solve such CLI, a victim UE may make CLI measurements and report to RAN node using first layer (L1) measurement procedure. The present disclosure describes some detailed solutions for L1 CLI measurement, including gap-assisted measurement and non-gap-assisted measurement, L1 CLI measurement / configuration restrictions when duel-connectivity (DC) is supported. The present disclosure describes solutions for SBFD impact at normal uplink / supplementary uplink (NUL / SUL) carrier selection.
[0030] FIG. 1A shows a wireless communication system 100 including a wireless network node (or a wireless communication node) 118 and one or more user equipment (UE) (or a wireless communication device or terminal) 110. The wireless network node may include a network base station, which may be a nodeB (NB, e.g., a gNB, eNB, or xNB) in a mobile telecommunications context. Each of the UE may wirelessly communicate with the wireless network node via one or more radio channels 115 for downlink / uplink communication. For example, a first UE 110 may wirelessly communicate with a wireless network node 118 via a channel including a plurality of radio channels during a certain period of time. The network base station 118 may send high layer signaling to the UE 110. The high layer signaling may include configuration information for communication between the UE and the base station. In one implementation, the high layer signaling may include a radio resource control (RRC) message.
[0031] In the present disclosure, the description of various embodiments / implementations may focus on the level of slots (or the level of symbols in some other various embodiments and / or implementations) , which is not a limitation to the embodiment (s) / implementation (s) and the described embodiments / implementations may be applicable to both the level of slots and the level of symbols.
[0032] For a non-limiting example, referring to FIG. 1B, a typical symbol / slot structure is DDDSU (151, 152, 153, 154, and 155) . Here, D represents a DL symbol / slot, U represents a UL symbol / slot, and S represents a flexible symbol / slot, which contains DL symbols and UL symbols. Obviously, UL slots are fewer and discontinuous, and these characteristics affect the performance of UL transmission. For example, due to no more consecutive or available UL slots, a large data volume of UL may not be supported, and / or more importantly, a timeliness and edge coverage of UL transmission may be relatively poor.
[0033] In some implementations, the full-duplex technology based on the UL subband may be implemented as subband full duplex (SBFD) , wherein the configuration patterns of the UL subband may have the various types.
[0034] FIG. 1B shows one type of the configuration pattern of the UL subband, wherein a UL subband 160 is configured only in DL symbols / slots. In some implementations, the UL subbands may be configured in some or all DL symbols / slots.
[0035] FIG. 1C shows another type of the configuration pattern of the UL subband, wherein a UL subband 170 is configured in DL symbols / slots and flexible symbols / slots. In some implementations, the UL subbands may be configured in some or all of the DL symbols / slots and some or all of the flexible symbols / slots.
[0036] FIG. 1D shows another type of the configuration pattern of the UL subband, wherein a UL subband 180 is configured in DL symbols / slots, flexible symbols / slots and UL symbols / slots. In some implementations, the UL subbands may be configured in some or all of the DL symbols / slots, some or all of the flexible symbols / slots, and some or all of the UL symbols / slots.
[0037] In some implementations, a UL subband may be configured to contain at least one DL symbol / slot.
[0038] In various embodiments, a UL subband may provide continuous UL symbols / slots, which is beneficial to expand UL resources, to reduce the delay of UL transmission, for example, by reducing the time waiting for UL opportunities to improve performance in terms of UL capacity, delay, and / or coverage.
[0039] FIG. 2 shows an example of electronic device 200 to implement a network base station. The example electronic device 200 may include radio transmitting / receiving (Tx / Rx) circuitry 208 to transmit / receive communication with UEs and / or other base stations. The electronic device 200 may also include network interface circuitry 209 to communicate the base station with other base stations and / or a core network, e.g., optical or wireline interconnects, Ethernet, and / or other data transmission mediums / protocols. The electronic device 200 may optionally include an input / output (I / O) interface 206 to communicate with an operator or the like.
[0040] The electronic device 200 may also include system circuitry 204. System circuitry 204 may include processor (s) 221 and / or memory 222. Memory 222 may include an operating system 224, instructions 226, and parameters 228. Instructions 226 may be configured for the one or more of the processors 124 to perform the functions of the network node. The parameters 228 may include parameters to support execution of the instructions 226. For example, parameters may include network protocol settings, bandwidth parameters, radio frequency mapping assignments, and / or other parameters.
[0041] FIG. 3 shows an example of an electronic device to implement a terminal device 300 (for example, user equipment (UE) ) . The UE 300 may be a mobile device, for example, a smart phone or a mobile communication module disposed in a vehicle. The UE 300 may include communication interfaces 302, a system circuitry 304, an input / output interfaces (I / O) 306, a display circuitry 308, and a storage 309. The display circuitry may include a user interface 310. The system circuitry 304 may include any combination of hardware, software, firmware, or other logic / circuitry. The system circuitry 304 may be implemented, for example, with one or more systems on a chip (SoC) , application specific integrated circuits (ASIC) , discrete analog and digital circuits, and other circuitry. The system circuitry 304 may be a part of the implementation of any desired functionality in the UE 300. In that regard, the system circuitry 304 may include logic that facilitates, as examples, decoding and playing music and video, e.g., MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback; running applications; accepting user inputs; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections for, as one example, internet connectivity; establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying relevant information on the user interface 310. The user interface 310 and the inputs / output (I / O) interfaces 306 may include a graphical user interface, touch sensitive display, haptic feedback or other haptic output, voice or facial recognition inputs, buttons, switches, speakers and other user interface elements. Additional examples of the I / O interfaces 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headset and microphone input / output jacks, Universal Serial Bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors) , and other types of inputs.
[0042] Referring to FIG. 3, the communication interfaces 302 may include a Radio Frequency (RF) transmit (Tx) and receive (Rx) circuitry 316 which handles transmission and reception of signals through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceivers may be wireless transceivers that include modulation / demodulation circuitry, digital to analog converters (DACs) , shaping tables, analog to digital converters (ADCs) , filters, waveform shapers, filters, pre-amplifiers, power amplifiers and / or other logic for transmitting and receiving through one or more antennas, or (for some devices) through a physical (e.g., wireline) medium. The transmitted and received signals may adhere to any of a diverse array of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM) , frequency channels, bit rates, and encodings. As one specific example, the communication interfaces 302 may include transceivers that support transmission and reception under the 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS) , High Speed Packet Access (HSPA) +, 4G / Long Term Evolution (LTE) , 5G standards, 6G, and / or any further generation standards. The techniques described below, however, are applicable to other wireless communications technologies whether arising from the 3rd Generation Partnership Project (3GPP) , GSM Association, 3GPP2, IEEE, or other partnerships or standards bodies.
[0043] Referring to FIG. 3, the system circuitry 304 may include one or more processors 321 and memories 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to carry out desired functionality for the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, 6G, or other data that the UE 300 may send, or has received, through the communication interfaces 302. In various implementations, a system power for the UE 300 may be supplied by a power storage device, such as a battery or a transformer.
[0044] The present disclosure describes various embodiment for resolving cross link interference (CLI) in a subband full duplex (SBFD) technique, which may be implemented, partly or totally, by one or more network base station and / or one or more user equipment described above in FIGs. 2-3. The various embodiments in the present disclosure may enable efficient wireless transmission in the telecommunication system, which may increase the resource utilization efficiency and / or boost wireless communication performance.
[0045] In some implementations, when the SBFD technique is applied in the TDD system, a RAN node can allocate some frequency resources (referred as UL subband) for UL transmission inside a DL carrier, and the RAN node can schedule a UE to transmit UL reference signals or UL data transmission in the UL subband. The time resource that can be allocated with the UL subband may be called as SBFD symbol or SBFD slot. The SBFD configuration can be provided from the RAN node to the UE, which informs the UE with respect to the time and / or frequency domain resource allocation of the UL subband in the DL carrier.
[0046] In some implementations, the SBFD configuration may include at least one of: a SBFD time configuration and / or a SBFD frequency configuration.
[0047] In some implementations, the 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 bit 1 in the bitmap indicates it is a SBFD slot; a SBFD slot periodicity; a SBFD slot offset regards to a TDD pattern periodicity or a SBFD slot periodicity; a SBFD symbol offset regards to SBFD slot offset; and / or a continuous slot or continuous symbol of SBFD operation.
[0048] In some implementations, the SBFD frequency configuration of each DL carrier may include at least one of the following: an offset to carrier of the UL subband, whose unit may be resource block (RB) ; a number of continuous RBs of the UL subband; and / or a number of continuous RBs of the guard band between UL subband and DL subband.
[0049] In some implementations, a TDD pattern may be determined per cell by a RAN node. In some implementations, a semi-static TDD pattern may be broadcasted in the cell, so it is common for all UEs accessing to this cell. In some implementations, the semi-static TDD pattern may include at least one of the following: a periodicity of the 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 indications of time locations of DL / UL slot / symbols in one periodicity.
[0050] In some implementations, a receiving node may receive reference signal (RS) in a guard band between a UL subband and a DL subband. In such implementations, the DL subband may include the DL subband and the guard band.
[0051] In some implementations, a receiving node may not receive the RS in the guard band between a UL subband and a DL subband. In such implementations, the DL subband may include only the DL subband without the guard band.
[0052] In some implementations, CLI may refer to a UE-to-UE CLI, wherein one UE’s (referred as aggressor UE) UL transmission may interfere another UE’s (referred as victim UE) DL reception. The aggressor UE and the victim UE may be within one same cell or within two different cells which are neighbors. In some implementations, the UE-to-UE CLI may happen when a SBFD technique is enabled, for example, one UE (UE1, also referred as aggressor UE) may transmit UL transmission in a UL subband in a DL carrier; and another UE (UE2, also referred as victim UE) may receive DL reception in the same DL carrier at the same time. When the UE1 and the UE2 are close to each other, the UE2’s DL reception may be interfered by the UE1’s UL transmission. In some implementations, the UE-to-UE CLI may happen when different TDD DL / UL patterns are used between neighboring cells, and the UL transmission in one cell may interfere with the DL reception in another cell.
[0053] In some implementations with a layer 1 (L1) CLI measurement, a victim UE may measure a L1 CLI resource and the victim UE may report the L1 CLI measurement result to a RAN node, so that the RAN node may determine the severity of cross link interference between an aggressor UE and the victim UE, and may make actions to mitigate such inference. The L1 CLI measurement result is generated and reported directly via the victim UE’s physical layer, i.e., physical uplink control channel (PUCCH) and / or physical uplink shared channel (PUSCH) .
[0054] In some implementations, the L1 CLI measurement is mainly used for SBFD scenario, e.g., one UE (UE1, also referred as aggressor UE) transmits UL transmission in a UL subband in a DL carrier, and another UE (UE2, also referred as victim UE) receives DL reception in the same DL carrier at the same time. So the UE2 may perform the L1 CLI measurement and report the L1 CLI measurement result to the RAN node.
[0055] In some implementations with a layer 3 (L3) CLI measurement, a L3 measurement means that a UE measures multiple beams (or at least one beam) of a cell and the measurements results (e.g., power values) are averaged to derive the measurement representing cell quality. In some implementations, the L3 measurement may be configured with one or multiple measurement objects. The L3 CLI measurement result may be generated and reported at the UE’s RRC layer.
[0056] In some implementations, a CLI measurement may include a L3 CLI measurement and / or a L1 CLI measurement.
[0057] In some implementations, a measurement gap may refer to a configured time period; and within such time period, a UE may not receive or transmit any DL / UL channels or signals, and the UE may only make L3 or L1 measurements during the time period.
[0058] In some implementations, there are non-gap-assisted and gap-assisted measurements, depending on a portion or all of the following: different measured resources, different UE capabilities, and / or different measurement conditions. Non-gap-assisted measurement may refer to some measurements that don’ t need measurement gap for measurement; and gap-assisted measurements may refer to some measurements that need measurement gap for measurement.
[0059] In various embodiments / implementations in the present disclosure, the measurement gap may include a traditional measurement gap and / or a network controlled small gap (NCSG) .
[0060] In some implementations, a L1 CLI resource used for a L1 CLI measurement may include at least one of the following: a sounding reference signal (SRS) resource, a SRS resource dedicated for a L3 CLI measurement, a SRS resource dedicated for a L1 CLI measurement, a CLI received signal strength indicator (CLI-RSSI) resource, a CLI-RSSI resource dedicated for a L3 CLI measurement, a CLI-RSSI resource dedicated for a L1 CLI measurement, and / or a UL reference signal resource dedicated for CLI measurement.
[0061] In some implementations, a L1 CLI measurement result may contain at least one of the following: a L1 SRS-reference signal received power (SRS-RSRP) , a L1 SRS-reference signal received quality (SRS-RSRQ) , a L1 SRS-signal to interference plus noise ratio (SRS-SINR) , and / or a L1 CLI-RSSI.
[0062] For a non-limiting examples, when a RAN node schedules a UE to measure a L1 SRS-RSRP for a L1 CLI measurement, the RAN node may send a SRS configuration dedicated for the CLI measurement to the UE, wherein the SRS configuration may be allocated in the UL subband of a DL carrier, the SRS may be sent by another UE, the another UE may be within the same cell of the UE, or within neighbor cell of the UE. The UE needs to receive the SRS according to the SRS configuration, and the UE needs to measure SRS-RSRP in the UE’s physical layer.
[0063] For another non-limiting example, when a RAN node schedules a UE to measure a L1 CLI-RSSI for a L1 CLI measurement, the RAN node may send a RSSI resource configuration to the UE, wherein the RSSI resource may be allocated within UE’s active DL frequency resource. The UE needs to measure the CLI RSSI resource according to the RSSI resource configuration, and the UE needs to measure CLI-RSSI in the UE’s physical layer.
[0064] In some implementations, a UE may indicate whether the UE supports to make each kinds of L1 CLI measurement result. This capability can be a per UE level capability, or per band UE capability, or per band combination UE capability, or per feature set UE capability, or per feature set per component carrier UE capability.
[0065] In some implementations, an information element (IE) cli-RSSI-Meas-r16 and / or cli-SRS-RSRP-Meas-r16 may be reused / shared to indicate whether a UE supports to make L1 CLI-RSSI measurement and / or L1 SRS-RSRP measurement.
[0066] In some implementations, a UE’s active DL frequency resource may include at least one of the following: a UE’s active DL bandwidth part (BWP) , a UE’s active DL channel bandwidth, a UE’s active DL carrier, a UE’s active DL carrier of the serving cell, an overlapping frequency part of the UE’s active BWP and DL subband, or an overlapping frequency part of UE’s active DL channel bandwidth and DL subband.
[0067] In some implementations, the UE mentioned in various embodiments / implementations may be a SBFD-aware UE, which is a UE that supports SBFD technique and knows the SBFD resource configuration of the cell.
[0068] In some implementations, the UE mentioned in various embodiments / implementations may be a non SBFD-aware UE, which is a UE that is not scheduled with SBFD, but suffers from CLI and needs to make CLI measurement.
[0069] Referring to FIG. 4A, the present disclosure describes various embodiments of a method 400 for wireless communication. The method 400 may be performed by a wireless communication device (e.g., a user equipment) . The method 400 may include a portion or all of the following: step 410, receiving, by a user equipment (UE) from a base station, a layer 1 (L1) cross link interference (CLI) measurement configuration; step 420, determining, by the UE, whether the UE needs a measurement gap for a L1 CLI measurement, and / or step 430, performing, by the UE, the L1 CLI measurement. In some implementations, the L1 CLI measurement is performed by the UE with the measurement gap or without the measurement gap.
[0070] Referring to FIG. 4B, the present disclosure describes various embodiments of a method 450 for wireless communication. The method 450 may be performed by a wireless communication node (e.g., a base station or a radio access network (RAN) ) . The method 450 may include a portion or all of the following: step 460, sending, by a base station to a user equipment (UE) , a L1 CLI measurement configuration, and / or step 470, receiving, by the base station from the UE, a L1 CLI measurement result of a L1 CLI measurement performed by the UE.
[0071] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 CLI measurement is performed to obtain the L1 CLI measurement result by the UE with the measurement gap or without the measurement gap.
[0072] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: in response to the L1 CLI measurement being an intra-frequency measurement, determining that the UE does not need the measurement gap for the L1 CLI measurement; and / or in response to the L1 CLI measurement being an inter-frequency measurement, determining that the UE needs the measurement gap for the L1 CLI measurement.
[0073] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: determining, by the UE based on a first UE capability, whether the UE needs the measurement gap for the L1 CLI measurement for an intra-frequency measurement or for an inter-frequency measurement; and / or reporting, by the UE, the first UE capability to a base station.
[0074] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: determining, by the UE, whether the UE needs the measurement gap for the L1 CLI measurement according to the L1 CLI measurement configuration; in response to a L1 CLI resource being fully contained in a UE’s active downlink (DL) frequency resource, determining, by the UE based on a second UE capability, whether the UE needs the measurement gap for the L1 CLI measurement for an intra-frequency measurement or for an inter-frequency measurement; and / or reporting, by the UE, the second UE capability to a base station.
[0075] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 CLI measurement is the intra-frequency measurement when at least one of the following is satisfied: a central frequency of a L1 CLI resource and a central frequency of a UE’s active DL frequency resource is same; a sub-carrier spacing (SCS) of the L1 CLI resource and a SCS of the UE’s active DL frequency resource is same; a cyclic prefix (CP) of the L1 CLI resource and a CP of the UE’s active DL frequency resource is same; acentral frequency of the L1 CLI resource is within a bandwidth of the UE’s active DL frequency resource; and / or a frequency bandwidth of the L1 CLI resource is totally contained inside the bandwidth of the UE’s active DL frequency resource.
[0076] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: determining, by the UE based on a third UE capability, whether the UE needs the measurement gap for the L1 CLI measurement; and / or reporting, by the UE, the third UE capability to a base station.
[0077] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: in response to a L1 CLI resource for the L1 CLI measurement being fully contained in a UE’s active DL frequency resource, determining, by the UE, that the UE does not need the measurement gap for the L1 CLI measurement.
[0078] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: in response to a L1 CLI resource for the L1 CLI measurement being not fully contained in a UE’s active DL frequency resource, determining, by the UE, that the UE needs the measurement gap for the L1 CLI measurement.
[0079] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises: in response to a L1 CLI resource for the L1 CLI measurement being fully contained in a UE’s active DL frequency resource, determining, by the UE based on a fourth UE capability, whether the UE needs the measurement gap for the L1 CLI measurement for an intra-frequency measurement or an inter-frequency measurement; and / or reporting, by the UE, the fourth UE capability to a base station.
[0080] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the method may include reporting, by the UE, a fifth UE capability, wherein the fifth UE capability indicates whether the UE supports to measure L1 CLI resource whose frequency part is partially or fully outside the UE’s active DL frequency resource.
[0081] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the method may include, in response to the UE determining that the UE needs the measurement gap for the L1 CLI measurement, determining, by the UE, a configuration for the measurement gap.
[0082] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the determining the configuration for the measurement gap comprises at least one of the following: determining the configuration for the measurement gap for a L1 CLI measurement according to one or more gap patterns that are added into a set of existing patterns of the measurement map; determining the configuration for the measurement gap for the L1 CLI measurement according to a measurement gap configured for a L3 CLI measurement; and / or determining the configuration for the measurement gap for the L1 CLI measurement according to information and one or more measurement gaps configured for the L3 CLI measurement, wherein the information indicates which measurement gap is associated with the LI CLI measurement among the one or more measurement gaps.
[0083] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the performing the L1 CLI measurement comprises: performing the L1 CLI measurement without the measurement gap; and / or only measuring the LI CLI resource which is overlapped with the UE’s active DL frequency resource.
[0084] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the performing the L1 CLI measurement comprises: performing the L1 CLI measurement without the measurement gap; and / or in response to the LI CLI resource not overlapping with the UE’s active DL frequency resource, switching the UE’s active DL frequency resource so as to cover the L1 CLI resource, and the UE measures the LI CLI resource.
[0085] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the method further includes reporting, by the UE, a UE capability to indicate a maximum number of L1 CLI resource that the UE is capable of measuring, wherein the UE capability comprises at least one of the following: a maximum number of L1 CLI resource for a specific L1 CLI measurement result that the UE is capable of measuring or processing; a maximum number of a sum of L1 CLI resource and L3 CLI resource that the UE is capable of measuring or processing for a specific CLI measurement result; and / or a maximum number of a sum of L1 CLI resource and L3 CLI resource in one slot that the UE is capable of measuring or processing for a specific CLI measurement result.
[0086] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the UE is scheduled with the L1 CLI measurement from a master node (MN) and a secondary node (SN) ; and / or the MN coordinates with the SN for at least one of the following: a maximum number of L1 CLI resource that the SN is capable of configuring to the UE, and / or a maximum number of a sum of L1 CLI resource and L3 CLI resource that the SN is capable of configuring to the UE.
[0087] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 CLI resource for the L1 CLI measurement comprises at least one of the following: sounding reference signal (SRS) resource, or CLI received signal strength indicator (CLI-RSSI) resource; and / or the UE’s active DL frequency resource comprises at least one of the following: UE’s active DL bandwidth part (BWP) , UE’s active DL channel bandwidth, an overlapping frequency part of the UE’s active DL BWP and DL subband, or an overlapping frequency part of the UE’s active DL channel bandwidth and DL subband.
[0088] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the method further includes receiving, by the UE, a first random access channel (RACH) configuration containing RACH occasions on subband full duplex (SBFD) resource, wherein the first RACH configuration is only configured in normal uplink (NUL) carrier, not in a supplementary uplink (SUL) carrier.
[0089] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the method further includes, in response to a random access (RA) initiation slot or symbol having selectable one or more RACH occasions (ROs) from the first RACH configuration and having selectable ROs from a RACH configuration in the SUL carrier, determining, by the UE based on a threshold, whether to adopt the first RACH configuration or adopt the RACH configuration in the SUL carrier to perform random access.
[0090] In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the RA initiation slot or symbol comprises at least one of the following: an earliest slot or symbol that contains a selectable RO after the UE determines to perform RA procedure; a latest slot or symbol that contains a selectable RO after the UE determines to perform RA procedure; and / or a SBFD slot or symbol that contains a selectable RO in UL subband in the frequency domain.
[0091] The present disclosure describes various exemplary embodiments for resolving cross link interference (CLI) in a subband full duplex (SBFD) technique in a wireless communication system, and the exemplary embodiments merely serve as examples and do not pose limitations. Any steps and / or operations in one same embodiment / implementation or more than one different embodiments / implementation in the present disclosure may be combined or arranged in any amount or order, as desired. Two or more of the steps and / or operations may be performed in parallel. Embodiments and implementations in the disclosure may be used separately or combined in any order. Further, each of the methods (or embodiments) may be implemented by processing circuitry (e.g., one or more processors or one or more integrated circuits) .
[0092] Embodiment Set I
[0093] The present disclosure describes various embodiments for determining whether a UE needs a measurement gap in a L1 CL1 measurement.
[0094] In some implementations, a RAN node may send a UE a L1 CLI measurement request, which can be represented as one or more sets of LI CLI resource configurations, and / or some measurement report configurations. Upon receiving the measurement request, the UE may make a L1 CLI measurement according to the RAN node’s instruction.
[0095] In some implementations, there may be some issues / problems to be solved. For example, when a RAN node schedules a UE to measure a L1 CLI resource for a L1 CLI measurement, and the L1 CLI resource to be measured has partial overlap or non-overlap in frequency domain with the UE’s current active DL frequency resource, considering the UE may only have one radio frequency (RF) chain, how can the UE receive and measure such L1 CLI resource in different frequency while the UE has to perform regular DL data reception at the same time?
[0096] In some implementations, whether a L1 CLI measurement is an intra-frequency measurement may be defined according to one, a portion, or all of the following alternatives. For one alternative (Alt1) : the centre frequency of the L1 CLI resource to be measured and the centre frequency of the UE’s active DL frequency resource is same; for another alternative (Alt2) : the SCS of the L1 CLI resource to be measured and the SCS of the UE’s active DL frequency resource is same; for another alternative (Alt3) : the cyclic prefix (CP) of the L1 CLI resource to be measured and the CP of the UE’s active DL frequency resource is same; for another alternative (Alt4) : the centre frequency of the L1 CLI resource to be measured is within the bandwidth of the UE’s active DL frequency resource; for another alternative (Alt5) : the frequency bandwidth of the L1 CLI resource to be measured is totally contained inside the bandwidth of the UE’s active DL frequency resource.
[0097] In some implementations, when a L1 CLI measurement is not an intra-frequency measurement, the L1 CLI measurement may be defined as an inter-frequency measurement.
[0098] In some implementations, at least to solve one of the problems / issues described above, at least one of the following options may be specified with respect to the measuring UE’s behavior.
[0099] For one option (Option 1) : when a L1 CLI measurement is an intra-frequency measurement, a UE does not need measurement gap to measure a CLI resource; and / or when a L1 CLI measurement is an inter-frequency measurement, a UE needs measurement gap to measure a L1 CLI resource.
[0100] For another option (Option 2) : a UE can report UE capability, wherein the UE capability indicates that, whether UE can measure L1 CLI resource with or without measurement gap. For non-limiting examples, when a UE reports that the UE can measure L1 CLI resource without a measurement gap, it means UE does not need measurement gap to measurement L1 CLI resource for L1 CLI measurement; and / or when a UE reports its UE capability that the UE cannot measure L1 CLI resource without a measurement gap, the UE needs measurement gap to measure L1 CLI resource for L1 CLI measurement.
[0101] For another option (Option 3) : a UE can report UE capability, wherein the UE capability indicates that, for intra-frequency or inter-frequency measurement, whether UE can measure L1 CLI resource with or without measurement gap. For non-limiting examples, when a UE reports that the UE can measure L1 CLI resource without measurement gap in inter-frequency measurement, it means the UE does not need measurement gap to measurement L1 CLI resource for inter-frequency L1 CLI measurement; and / or when a UE reports its UE capability that the UE cannot measure L1 CLI resource without measurement gap in inter-frequency measurement, the UE needs measurement gap to measure L1 CLI resource for inter-frequency L1 CLI measurement.
[0102] For another option (Option 4) : when the CLI resource to be measured for L1 CLI measurement is fully contained in the UE’s active DL frequency resource, the UE does not measurement gap to measure L1 CLI measurement; and / or when the CLI resource to be measured for L1 CLI measurement is not fully contained in the UE’s active DL frequency resource (e.g., the CLI resource and the UE’s active DL frequency resource has partial overlapping or none-overlapping in frequency domain) , the UE needs measurement gap to measure such CLI resource for L1 CLI measurement.
[0103] For another option (Option 5) : the UE can report UE capability, wherein the UE capability indicates that, when the L1 CLI resource to be measured for L1 CLI measurement is fully contained in the UE’s active DL frequency resource, whether the UE needs measurement gap to perform such L1 CLI measurement or not.
[0104] For another option (Option 6) : the UE can report UE capability, the UE capability indicates that, when the CLI resource to be measured for L1 CLI measurement is not fully contained in the UE’s active DL frequency resource, whether the UE needs measurement gap to perform such L1 CLI measurement or not.
[0105] For another option (Option 7) : the UE can report UE capability, wherein the UE capability indicates that, when intra-frequency or inter-frequency measurement is satisfied, and when the CLI resource to be measured for L1 CLI measurement is fully contained in the UE’s active DL frequency resource, whether the UE needs measurement gap to perform such L1 CLI measurement or not.
[0106] For another option (Option 8) : the UE can report UE capability, wherein the UE capability indicates that, when intra-frequency or inter-frequency measurement is satisfied, and when the CLI resource to be measured for L1 CLI measurement is not fully contained in the UE’s active DL frequency resource, whether the UE needs measurement gap to perform such L1 CLI measurement or not.
[0107] For another option (Option 9) : the UE can report a RRC signaling that, for measuring a frequency or a band or a band combination for L1 CLI measurement, whether measurement gap is needed for the L1 CLI measurement.
[0108] In some implementations, a UE can report the UE capability that whether UE support to measure L1 or L3 CLI resource whose frequency part is partially or fully outside the UE’s active DL frequency resource.
[0109] In some implementations, a UE can report the UE capability that whether UE support to make a inter-frequency L1 or L3 CLI measurement.
[0110] In some implementations, all of the above mentioned UE capability can be a per UE level capability, a per band capability, a per band combination capability, a per feature set (FS) capability, or a per feature set per component-carrier (FSPC) capability.
[0111] In some implementations, for a portion or all the above options, when saying ‘when intra-frequency or inter-frequency measurement is satisfied’ , it means UE can explicitly determine the measurement as inter-frequency measurement or intra-frequency measurement using the different alternatives, then determine whether the measurement gap is needed; it can also mean UE does not need to determine whether the measurement is inter-frequency measurement or intra-frequency measurement explicitly, UE can use the different alternatives and / or options to directly determine whether the measurement needs a measurement gap or not.
[0112] In some implementations, when the L1 CLI resource configuration is provided per serving cell, UE can perform L1 CLI measurement for the UE’s current active DL frequency resource, or, a base station (e.g., gNB) can indicate which UE’s DL frequency resource should measure the L1 CLI resource. For a non-limiting example, the gNB indicates a BWP ID in L1 CLI configuration, the UE should only measure the indicated BWP for L1 CLI.
[0113] In some implementations, a portion or all of the above implementations for determining whether L1 CLI measurement needs gap or not, can also be applied to L3 CLI measurement, i.e., the above criteria can be used to determine whether L3 CLI measurement needs gap or not.
[0114] Embodiment Set II
[0115] The present disclosure describes various embodiments for determining, when a UE needs a measurement gap in a L1 CL1 measurement, how to configure the measurement gap.
[0116] In some implementations, a L3 measurement means that a UE measures multiple beams (at least one) of a cell and the measurements results (e.g., power values) are averaged to derive the cell quality. The L3 measurement may be configured with one or multiple measurement objects. The L3 measurement may be associated with a measurement gap, i.e., UE will be required to measure some of the measurement objects within the measurement gap. In some implementations, a L3 measurement may include at least one of a L3 CLI measurement, a L3 radio resource management (RRM) measurement, etc.
[0117] In some implementations, at least one of the following methods may be supported (or performed) to configure a L1 CLI measurement with a measurement gap.
[0118] For one method, an existing pattern of the measurement gap may be increased to add specific one or more gap pattern (s) for L1 CLI measurement, since L1 CLI measurement may have different periodicity and / or length with L3 measurement. i.e., a RAN node can send measurement gap configuration with specific gap pattern dedicated for L1 CLI measurement.
[0119] For another method, a UE may reuse the measurement gap configured for L3 measurement to measure the L1 CLI measurement. That is to say, when the UE determines the configured measurement gap can be sufficient for its L1 CLI measurement, the UE can reuse the configured measurement gap. Furthermore, a RAN node can explicit indicate whether a UE is allowed to reuse the measurement gap configured for L3 measurement to measure the L1 CLI measurement. Further, some frequencies are already measured by L3 CLI measurement and the UE may already get / store the corresponding measurement gap, such frequencies can be configured for L1 CLI measurement as inter-frequency measurement, and the gap can be reused.
[0120] For another method, when a UE is provided with one or more measurement gaps for L3 measurement at the same time, the UE can also be provided the information that the L1 CLI measurement is associated with which one or more measurement gaps. Furthermore, the UE can also be provided the information that the L1 CLI measurement measuring specific L1 CLI resource (e.g., SRS resource, CLI RSSI resource) is associated with which one or more measurement gap. Furthermore, the UE can also be provided the information that the L1 CLI measurement associating with specific L1 CLI measurement result (e.g., SRS-RSRP, CLI-RSSI) is associated with which one or more measurement gap.
[0121] For another method, a UE can be indicated gap sharing configuration for L1 CLI measurement. For non-limiting examples, in a measurement gap, a UE can be indicated a percentage of time during the configured time period of the gap, and the percentage of time is the time for measuring L1 CLI resource and acquiring L1 CLI measurement result. Further, intra-frequency L1 CLI measurement can reuse the percentage of time for legacy L3 intra-frequency measurement, inter-frequency L1 CLI measurement can reuse the percentage of time for legacy L3 inter-frequency measurement.
[0122] For another method, a UE can be provided with measurement gap configuration dedicated for L1 CLI measurement. Additionally, the measurement gap configuration for L1 CLI measurement can be transmitted from a distributed unit (DU) to a centralized unit (CU) in a gNB via F1 interface. Further, the CU can request the DU to report such measurement gap configuration in advance. Further, the measurement gap configuration for L1 CLI measurement can be transmitted between gNBs, e.g., from source gNB to target gNB, from target gNB to source gNB, or from a master node (MN) to a secondary node (SN) , or from a SN to a MN.
[0123] In some implementations, a current L3 CLI measurement does not need to associate a measurement gap. However when the L3 CLI measurement needs to associate a measurement gap, a portion or all of the above gap configuration methods for L1 CLI measurement can also be applicable to the gap configuration for L3 CLI measurement.
[0124] Embodiment Set III
[0125] The present disclosure describes various embodiments for determining measurement restriction on L1 CLI measurements.
[0126] In some implementations, a L1 CLI measurement may be generated in a UE’s physical (PHY) layer and it may be reported frequently with small timing delay. When a measurement gap is needed in a L1 CLI measurement, the measurement gap may be configured dense to satisfy the measurement needs. However, the dense measurement gap may cause frequent break during UE’s UL / DL data transmissions, which may lead to system throughput decrease.
[0127] In some implementations, a solution may include restricting measuring UE’s behaviour when the UE is configured with a L1 CLI measurements, so that UE may not need measurement gap when making L1 CLI measurements.
[0128] For non-limiting examples, a UE may only measure the L1 CLI resource which is overlapped with the UE’s active DL frequency resource. Furthermore, this restriction can be an indication transmitted from a RAN node to the UE, e.g., RRC signaling, or this restriction is a pre-defined rule in the specification.
[0129] For another non-limiting example, when a UE is scheduled to measure a L1 CLI resource which is partially or fully outside the UE’s current active DL frequency resource, a gNB can firstly schedule the UE to switch its current active DL frequency resource to another active DL frequency resource which in frequency domain can cover the L1 CLI resource to be measured, then the UE can measure the L1 CLI resource.
[0130] With various embodiments in the present disclosure, a UE may perform L1 CLI measurements without measurement gap, which ensures the system throughput while performing L1 CLI measurements smoothly. In some implementations, the UE can switch DL BWP automatically to cover the L1 CLI resource to be measured for the requested L1 CLI measurement. In some implementations, the UE may measure the L1 CLI resource for L1 CLI measurement that has the same SCS with the DL active frequency resource in order to avoid adjusting the RF chain.
[0131] Embodiment Set IV
[0132] The present disclosure describes various embodiments for performing L1 CLI measurements in DC coordination, based on the reported UE capability.
[0133] In some implementations with UE capability report, at least one of the following UE capability may be reported from a UE to a RAN node for supporting L1 CLI measurement: a UE can report a maximum number of L1 CLI resource that the UE can measure for L1 CLI measurement, as a UE capability; a UE can report a maximum number of L1 CLI resource for a specific L1 CLI measurement result that the UE can measure / process, as a UE capability; a UE can report a maximum number of L1 CLI resource that the UE can measure or process in one slot for L1 CLI measurement, as a UE capability; and / or a UE can report a maximum number of L1 CLI resource that the UE can measure or process in one slot for a specific L1 CLI measurement result, as a UE capability.
[0134] In some implementations, the L1 CLI resource used for L1 CLI measurement can contain at least one of the following: SRS resource, SRS resource dedicated for L3 CLI measurement, SRS resource dedicated for L1 CLI measurement, CLR-RSSI resource, CLI-RSSI resource dedicated for L3 CLI measurement, CLI-RSSI resource dedicated for L1 CLI measurement, and / or a UL reference signal resource dedicated for CLI measurement. In some implementations, for each kind of L1 CLI resource, the above UE capability may be reported independently. For non-limiting examples, a UE may report a maximum number of the SRS resources that can be measured by the UE for L1 CLI SRS-RSRP measurement; and / or the UE can also report another maximum number of the CLI RSSI resources that can be measured by the UE for L1 CLI-RSSI measurement.
[0135] In some implementations, at least one of the following UE capability can be reported from a UE to a RAN node for supporting L1 CLI measurement: a UE can report a maximum number of the sum of L1 CLI resource and L3 CLI resource that the UE can measure / process for CLI measurement; a UE can report a maximum number of the sum of L1 CLI resource and L3 CLI resource that the UE can measure / process for a specific CLI measurement result; a UE can report a maximum number of the sum of L1 CLI resource and L3 CLI resource in one slot that the UE can measure / process for CLI measurement; and / or a UE can report a maximum number of the sum of L1 CLI resource and L3 CLI resource in one slot that the UE can measure / process for a specific CLI measurement result.
[0136] In some implementations, the L1 CLI resource used for L1 CLI measurement can contain at least one of the following: SRS resource, SRS resource dedicated for L3 CLI measurement, SRS resource dedicated for L1 CLI measurement, CLI RSSI resource, CLI-RSSI resource dedicated for L3 CLI measurement, CLI-RSSI resource dedicated for L1 CLI measurement, and / or a UL reference signal resource dedicated for CLI measurement. In some implementations, the L3 CLI resource used for L3 CLI measurement can contain at least one of the following: SRS resource, SRS resource dedicated for L3 CLI measurement, and / or CLI-RSSI resource dedicated for L3 CLI measurement. For non-limiting examples, a UE can report a maximum number of the total SRS resources that can be measured by the UE for L1 CLI SRS-RSRP measurement and L3 CLI SRS-RSRP measurement.
[0137] In some implementations, an IE maxNumberCLI-SRS-RSRP-r16 and / or maxNumberCLI-RSSI-r16 representing the UE capability of L3 CLI measurement may be reused / shared to indicate the maximum number of SRS resource for the L1 SRS-RSRP measurement and / or CSSI resource for the L1 CLI-RSSI measurement, or be reused / shared to indicate the maximum number of the sum of SRS resource for the L1 SRS-RSRP measurement and L3 SRS-RSRP measurement and / or CSSI resource for the L1 CLI-RSSI measurement and L3 CLI-RSSI measurement.
[0138] In some implementations, an IE maxNumberPerSlotCLI-SRS-RSRP-r16 representing the UE capability of L3 CLI measurement can be reused / shared to indicate the maximum number of L1 SRS resource to be processed per slot for the L1 SRS-RSRP measurement, or be reused / shared to indicate the maximum number of the sum of SRS resource to be processed per slot for the L1 SRS-RSRP measurement and L3 SRS-RSRP measurement.
[0139] In some implementations with MN-SN coordination based on above UE capability, a UE may be configured with L3 CLI measurement and L1 CLI measurement at the same time.
[0140] In some implementations, the L1 CLI measurement can be configured per serving cell. In some implementations, a UE can also support dual-connectivity (DC) . Therefore, the UE may be scheduled with L1 CLI measurement from both master node (MN) and secondary node (SN) . Under this scenario, when the above mentioned UE capability is per UE level, regarding to different kinds of UE capability mentioned above, at least one of the following MN-SN coordination may be supported: the MN may indicate to the SN that, the maximum number of L1 CLI resource that SN can configure to the UE for L1 CLI measurement; the MN may indicate to the SN that, the maximum number of L1 CLI resource that SN can configure to the UE for a specific L1 CLI measurement result; the MN may indicate to the SN that, the maximum number of the sum of L1 CLI resource and L3 CLI resource that SN can configure to the UE for CLI measurement; the MN may indicate to the SN that, the maximum number of the sum of L1 CLI resource and L3 CLI resource that SN can configure to the UE for specific L1 CLI measurement result.
[0141] In some implementations, the above indication may be indicated in the IE CG-ConfigInfo, or in ConfigRestrictInfoSCG, or in ResourceConfigNRDC as currently specified.
[0142] Embodiment Set V
[0143] The present disclosure describes various embodiments for SBFD and normal uplink / supplementary uplink (NUL / SUL) .
[0144] In some implementations, supplementary uplink (SUL) carrier may be configured in a lower frequency than a normal DL carrier or UL carrier to increase the UE’s UL coverage. For a TDD system, the SUL may be configured independent from a TDD pattern. In some implementations, at one time UE is only allowed to make UL transmission on either NUL or SUL, not on both at same time.
[0145] In some implementations, when SBFD configuration is provided, a UE may not be configured with SBFD frequency resource in SUL carrier.
[0146] In some implementations, a UE may only be configured with SBFD random access channel (RACH) configuration in the NUL carrier, not on the SUL carrier. In some implementations, SBFD RACH configuration means one or more sets of RACH configurations, each containing RACH occasions (ROs) allocated on SBFD resources, for random access purpose. In some implementations, the SBFD RACH configuration is a kind of specific RACH configuration, dedicated for the UE which supports to perform random access on the PRACH occasions which are allocated inside the SBFD resources.
[0147] In some implementations, when SBFD RACH configuration is configured within NUL carrier, when the ROs provided by such SBFD RACH configuration are within the configured UL subband in frequency domain, SBFD-aware UE may use such ROs to initiate RA in SBFD slot / symbol. That is to say, only the ROs provided by such SBFD RACH configuration are within the configured UL subband in frequency domain, the ROs can be valid.
[0148] In some implementations, a UE may only be configured with SBFD RACH configuration in DL carrier of a cell. The DL carrier contains UL subband configuration, the ROs provided by SBFD RACH configuration is within the UL subband.
[0149] In some implementations, a RAN node may configure RACH configuration on both NUL carrier and SUL carrier. In some implementations, a RAN node can configure SBFD RACH configuration and RACH configuration (i.e., legacy RACH configuration) on NUL carrier.
[0150] In some implementations, at least one of the following options may be used to solve the problem that how a UE may choose carrier and / or choose between different RACH configurations.
[0151] For one option (Option 1) : when a UE wants to perform random access procedure, the UE may perform a portion or all of the following. Firstly, the UE may choose RACH configuration configured either on NUL or SUL, based on a configured RSRP threshold, i.e. threshold 1. Then when the UE chooses NUL carrier, the UE may further choose whether to use SBFD RACH configuration or RACH configuration in NUL carrier, wherein, In this step, when the UE is provided with SBFD RACH configuration, the UE may choose SBFD RACH configuration rather than choosing RACH configuration on NUL carrier; and / or when the UE’s RS-RSRP measurement result is beyond a RSRP threshold, i.e., threshold 2, the UE may choose SBFD RACH configuration; and / or when the UE’s RS-RSRP measurement result is lower than a RSRP threshold, i.e., threshold 2, the UE may choose SBFD RACH configuration. Then, when the UE choose SUL carrier, the UE may not use SBFD RACH configuration to perform random access.
[0152] For another option (Option 2) : when a UE wants to perform random access (RA) procedure, when a RA initiation slot or symbol has selectable ROs from SBFD RACH configuration, and also has selectable ROs from RACH configuration in SUL carrier, the UE determines whether to adopt SBFD RACH configuration or RACH configuration in SUL carrier based on a threshold, i.e., threshold 3. In some implementations, the threshold 3 may be configured by the RAN node, or pre-defined by the specification, or determined by UE itself. In some implementations, the RA initiation slot or symbol is the latest (or the first / earliest) slot or symbol that contains a selectable RO after the UE wants to perform random access procedure. In some implementations, a selectable RO means the RO is valid and is mapped to a SSB that the SSB-RSRP is higher than a threshold.
[0153] In some implementations, when a UE’s RS-RSRP measurement result is beyond the RSRP threshold, i.e., threshold 3, the UE may choose SBFD RACH configuration; otherwise, the UE may choose RACH configuration configured on SUL carrier.
[0154] In some implementations, when a UE’s RS-RSRP measurement result is lower than the RSRP threshold, i.e., threshold 3, the UE may choose SBFD RACH configuration; otherwise, the UE may choose RACH configuration configured on SUL carrier.
[0155] In some implementations, the RA initiation slot or symbol may be a SBFD slot or symbol which contains selectable ROs in UL subband in frequency domain.
[0156] In some implementations, the RS mentioned above can be at least one of: a pathloss reference signal, a SSB, and / or a CSI-RS.
[0157] The benefit of this option (option 2) may include that, sometimes a UE may perform random access with low latency, so the UE may choose the latest selectable RO resource in RA initiation slot or symbol to reduce time latency.
[0158] For another option (Option 3) : when a UE is configured with SBFD RACH configuration, the UE may use SBFD RACH configuration to perform random access, the UE may ignore the selection between NUL carrier and SUL carrier.
[0159] In some implementations, the SBFD RACH configuration provides selectable ROs that is closest to the time when UE initiates RA procedure.
[0160] The benefits of this option (Options 3) may include that, when sometimes a UE is urgent to perform random access procedure with a lower latency requirement, so the UE may need more early random access chances (i.e., more ROs) . The UE may be configured with SBFD RACH configuration with a large number of ROs, and the UE can be configured with RACH configuration in SUL carrier with small number of ROs.
[0161] The present disclosure describes methods, apparatus, and computer-readable medium for resolving cross link interference (CLI) in a subband full duplex (SBFD) technique. The present disclosure addressed the issues with CLI in a wireless communication system. The methods, devices, and computer-readable medium described in the present disclosure may facilitate the performance of SBFD technique in wireless communication, thus improving efficiency and overall performance. The methods, devices, and computer-readable medium described in the present disclosure may improves the overall efficiency of the wireless communication systems.
[0162] In some other embodiments, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the above methods. The computer-readable medium may be referred as non-transitory computer-readable media (CRM) that stores data for extended periods such as a flash drive or compact disk (CD) , or for short periods in the presence of power such as a memory device or random access memory (RAM) . In some embodiments, computer-readable instructions may be included in a software, which is embodied in one or more tangible, non-transitory, computer-readable media. Such non-transitory computer-readable media can be media associated with user-accessible mass storage as well as certain short-duration storage that are of non-transitory nature, such as internal mass storage or ROM. The software implementing various embodiments of the present disclosure can be stored in such devices and executed by a processor (or processing circuitry) . A computer-readable medium can include one or more memory devices or chips, according to particular needs. The software can cause the processor (including CPU, GPU, FPGA, and the like) to execute particular processes or particular parts of particular processes described herein, including defining data structures stored in RAM and modifying such data structures according to the processes defined by the software. In various embodiments in the present disclosure, the term “processor” may mean one processor that performs the defined functions, steps, or operations or a plurality of processors that collectively perform defined functions, steps, or operations, such that the execution of the individual defined functions may be divided amongst such plurality of processors.
[0163] 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.
[0164] Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments, for non-limiting examples, a portion from one or more embodiment may be combined with another portion of other 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.
Claims
1.A method for wireless communication, comprising:receiving, by a user equipment (UE) from a base station, a layer 1 (L1) cross link interference (CLI) measurement configuration;determining, by the UE, whether the UE needs a measurement gap for a L1 CLI measurement, andperforming, by the UE, the L1 CLI measurement.2.A method for wireless communication, comprising:sending, by a base station to a user equipment (UE) , a L1 CLI measurement configuration, andreceiving, by the base station from the UE, a L1 CLI measurement result of a L1 CLI measurement performed by the UE.3.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:in response to the L1 CLI measurement being an intra-frequency measurement, determining that the UE does not need the measurement gap for the L1 CLI measurement; orin response to the L1 CLI measurement being an inter-frequency measurement, determining that the UE needs the measurement gap for the L1 CLI measurement.4.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:determining, by the UE based on a first UE capability, whether the UE needs the measurement gap for the L1 CLI measurement for an intra-frequency measurement or for an inter-frequency measurement; andreporting, by the UE, the first UE capability to a base station.5.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:determining, by the UE, whether the UE needs the measurement gap for the L1 CLI measurement according to the L1 CLI measurement configuration;in response to a L1 CLI resource being fully contained in a UE’s active downlink (DL) frequency resource, determining, by the UE based on a second UE capability, whether the UE needs the measurement gap for the L1 CLI measurement for an intra-frequency measurement or for an inter-frequency measurement; andreporting, by the UE, the second UE capability to a base station.6.The method according to any of claims 3 to 5, wherein:the L1 CLI measurement is the intra-frequency measurement when at least one of the following is satisfied:a central frequency of a L1 CLI resource and a central frequency of a UE’s active DL frequency resource is same;a sub-carrier spacing (SCS) of the L1 CLI resource and a SCS of the UE’s active DL frequency resource is same;a cyclic prefix (CP) of the L1 CLI resource and a CP of the UE’s active DL frequency resource is same;a central frequency of the L1 CLI resource is within a bandwidth of the UE’s active DL frequency resource; ora frequency bandwidth of the L1 CLI resource is totally contained inside the bandwidth of the UE’s active DL frequency resource.7.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:determining, by the UE based on a third UE capability, whether the UE needs the measurement gap for the L1 CLI measurement; andreporting, by the UE, the third UE capability to a base station.8.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:in response to a L1 CLI resource for the L1 CLI measurement being fully contained in a UE’s active DL frequency resource, determining, by the UE, that the UE does not need the measurement gap for the L1 CLI measurement.9.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:in response to a L1 CLI resource for the L1 CLI measurement being not fully contained in a UE’s active DL frequency resource, determining, by the UE, that the UE needs the measurement gap for the L1 CLI measurement.10.The method according to any of claims 1 to 2, wherein the determining whether the UE needs the measurement gap for the L1 CLI measurement comprises:in response to a L1 CLI resource for the L1 CLI measurement being fully contained in a UE’s active DL frequency resource, determining, by the UE based on a fourth UE capability, whether the UE needs the measurement gap for the L1 CLI measurement for an intra-frequency measurement or an inter-frequency measurement; andreporting, by the UE, the fourth UE capability to a base station.11.The method according to any of claims 1 to 2, further comprising:reporting, by the UE, a fifth UE capability, wherein the fifth UE capability indicates whether the UE supports to measure L1 CLI resource whose frequency part is partially or fully outside the UE’s active DL frequency resource.12.The method according to any of claims 1 to 2, further comprising:in response to the UE determining that the UE needs the measurement gap for the L1 CLI measurement, determining, by the UE, a configuration for the measurement gap.13.The method according 12, wherein the determining the configuration for the measurement gap comprises at least one of the following:determining the configuration for the measurement gap for a L1 CLI measurement according to one or more gap patterns that are added into a set of existing patterns of the measurement map;determining the configuration for the measurement gap for the L1 CLI measurement according to a measurement gap configured for a L3 CLI measurement; ordetermining the configuration for the measurement gap for the L1 CLI measurement according to information and one or more measurement gaps configured for the L3 CLI measurement, wherein the information indicates which measurement gap is associated with the LI CLI measurement among the one or more measurement gaps.14.The method according to any of claims 1 to 2, wherein the performing the L1 CLI measurement comprises:performing the L1 CLI measurement without the measurement gap; andonly measuring the LI CLI resource which is overlapped with the UE’s active DL frequency resource.15.The method according to any of claims 1 to 2, wherein the performing the L1 CLI measurement comprises:performing the L1 CLI measurement without the measurement gap; andin response to the LI CLI resource not overlapping with the UE’s active DL frequency resource, switching the UE’s active DL frequency resource so as to cover the L1 CLI resource, and the UE measures the LI CLI resource.16.The method according to any of claims 1 to 2, further comprises:reporting, by the UE, a UE capability to indicate a maximum number of L1 CLI resource that the UE is capable of measuring, wherein the UE capability comprises at least one of the following:a maximum number of L1 CLI resource for a specific L1 CLI measurement result that the UE is capable of measuring or processing;a maximum number of a sum of L1 CLI resource and L3 CLI resource that the UE is capable of measuring or processing for a specific CLI measurement result; ora maximum number of a sum of L1 CLI resource and L3 CLI resource in one slot that the UE is capable of measuring or processing for a specific CLI measurement result.17.The method according to claim 16, wherein:the UE is scheduled with the L1 CLI measurement from a master node (MN) and a secondary node (SN) ; andthe MN coordinates with the SN for at least one of the following:a maximum number of L1 CLI resource that the SN is capable of configuring to the UE, ora maximum number of a sum of L1 CLI resource and L3 CLI resource that the SN is capable of configuring to the UE.18.The method according to any of claims 3 to 17, wherein:the L1 CLI resource for the L1 CLI measurement comprises at least one of the following:sounding reference signal (SRS) resource, or CLI received signal strength indicator(CLI-RSSI) resource; andthe UE’s active DL frequency resource comprises at least one of the following: UE’s active DL bandwidth part (BWP) , UE’s active DL channel bandwidth, an overlapping frequency part of the UE’s active DL BWP and DL subband, or an overlapping frequency part of the UE’s active DL channel bandwidth and DL subband.19.The method according to any of claims 1 to 17, further comprises:receiving, by the UE, a first random access channel (RACH) configuration containing RACH occasions on subband full duplex (SBFD) resource, wherein the first RACH configuration is only configured in normal uplink (NUL) carrier, not in a supplementary uplink (SUL) carrier.20.The method according to claim 19, further comprising:in response to a random access (RA) initiation slot or symbol having selectable one or more RACH occasions (ROs) from the first RACH configuration and having selectable ROs from a RACH configuration in the SUL carrier, determining, by the UE based on a threshold, whether to adopt the first RACH configuration or adopt the RACH configuration in the SUL carrier to perform random access.21.The method according to claim 20, wherein:the RA initiation slot or symbol comprises at least one of the following:an earliest slot or symbol that contains a selectable RO after the UE determines to perform RA procedure;a latest slot or symbol that contains a selectable RO after the UE determines to perform RA procedure; ora SBFD slot or symbol that contains a selectable RO in UL subband in the frequency domain.22.A wireless communications apparatus comprising at least one processor and a memory, wherein the at least one processor is configured to read code from the memory and implement a method recited in any of claims 1 to 21.23.A computer program product comprising a computer-readable program medium code stored thereupon, the computer-readable program medium code, when executed by at least one processor, causing the at least one processor to implement a method recited in any of claims 1 to 21.
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