Systems and methods for uplink-downlink duplex
By reporting TA accuracy and collision information, wireless devices assist network nodes in adapting UL-DL configurations, addressing RTT variations and minimizing collisions in high mobility scenarios like NTN.
Patent Information
- Application Number
- PCT/CN2024/076472
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-06
- Publication Date
- 2025-08-14
AI Technical Summary
In high mobility scenarios such as non-terrestrial networks (NTN), the variation in round trip time (RTT) leads to frequent timing advance (TA) drift, causing collisions between uplink (UL) and downlink (DL) transmissions, which existing technologies struggle to manage effectively.
Wireless communication devices report assistance information, including TA accuracy and duration, collision indications, and adaptive UL-DL configuration requests to network nodes, enabling dynamic scheduling and minimizing collisions through enhanced MAC CEs and higher layer signaling.
The proposed solution effectively minimizes UL-DL collisions by ensuring accurate scheduling and configuration, maintaining communication efficiency in high mobility scenarios.
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Figure CN2024076472_14082025_PF_FP_ABST
Abstract
Description
SYSTEMS AND METHODS FOR UPLINK-DOWNLINK DUPLEXTECHNICAL FIELD
[0001] The disclosure relates generally to wireless communications, including but not limited to systems and methods for uplink-downlink duplex.BACKGROUND
[0002] The standardization organization Third Generation Partnership Project (3GPP) is currently in the process of specifying a new Radio Interface called 5G New Radio (5G NR) as well as a Next Generation Packet Core Network (NG-CN or NGC) . The 5G NR will have three main components: a 5G Access Network (5G-AN) , a 5G Core Network (5GC) , and a User Equipment (UE) . In order to facilitate the enablement of different data services and requirements, the elements of the 5GC, also called Network Functions, have been simplified with some of them being software based, and some being hardware based, so that they could be adapted according to need. Communication via satellite is one of the typical scenarios of the non-terrestrial networks in 3GPP standardization.SUMMARY
[0003] The example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
[0004] At least one aspect is directed to a system, method, apparatus, or a computer-readable medium of the following. A wireless communication device (e.g., a user equipment (UE) ) may send an assistance information for scheduling to a network node. In some embodiments, the assistance information may comprise at least one of: a TA accuracy or error bound; a timing advance (TA) accuracy duration; a reference time for the TA accuracy duration; or a reference time for a TA report; a collision indication; a time-domain resource on which collision may occur; a configuration request for uplink-downlink configuration; a configuration request for semi-static uplink or downlink transmission; an elevation angle; an round-trip time; an uplink downlink configuration, scheduling, or format; an uplink downlink configuration, scheduling, or format index from a plurality of candidate configurations; an offset for the uplink and downlink scheduling; or an offset index from a plurality of candidate values.
[0005] In some embodiments, the assistance information can be in a TA report or in another report. In some embodiments, a granularity of the TA report may correspond to a TA accuracy of the TA. The TA accuracy can be configured by the network node to the wireless communication via broadcast or signaling. A reference time for a TA report may comprise at least one of an end of a message carrying the TA report, a reported reference time for the TA, an end of a message carrying TA accuracy duration, or a reported reference time for the TA accuracy duration. In some embodiments, a size of a first message carrying the TA report can be greater than a size of a second message carrying another TA without associated assistance information, at least one of a reserved bit or a subheader can be configured to indicate whether the first message is carrying the assistance information. A size of a first message carrying the TA report can be greater than a size of a second message carrying another TA without associated assistance information, at least one of a Logical Channel Identity (LCID) or an Extended Logical Channel Identity (eLCID) is to identify the first message. A message may comprise the assistance information, at least one of an LCID or an eLCID is to identify the message. A first message may comprise the assistance information. At least one of a reserved bit or a subheader of a second message can be configured to indicate whether the message is carrying the assistance information.
[0006] In some embodiments, the wireless communication device may send the another report comprising the assistance information to the network node. The another report can be different from the TA report. The another report comprising the assistance information can be carried in a message, and at least one of a Logical Channel Identity (LCID) or an Extended Logical Channel Identity (eLCID) of the message is to identify the message. The another report comprising the assistance information can be carried in two or more messages, a first message comprises a first type of the assistance information and is identified using a first LCID or eLCID, and a second message comprises a second type of the assistance information and is identified using a second LCID or eLCID. The another report comprising the assistance information can be indicated to the network node via at least one of higher layer signaling or Radio Resource Control (RRC) signaling. In some embodiments, the wireless communication device may send a TA accuracy duration of the TA to the network node. At an end of the TA accuracy duration or after the TA accuracy duration, at least one of: the wireless communication device is triggered to send another TA report; the wireless communication device is triggered to send assistance information; uplink-downlink configuration, scheduling, or format is configured; or the wireless communication device is triggered to report assistance information for the uplink-downlink configuration, the scheduling, or the format.
[0007] In some embodiments, the wireless communication device may send the assistance information in response to at least one of: receiving a trigger indication from the network node, the trigger indication comprising a time frequency resource or grant information for sending the assistance information; receiving a trigger indication from the network node via upper layer signaling; sending a TA report; a TA accuracy duration ending; a TA variation being above a threshold or offset, wherein the TA variation comprises a difference between a current TA and previous reported TA; an RTT variation being above a threshold or offset; a Koffset variation being above a threshold or offset; a elevation angle changing to another value range; a elevation angle variation being above a threshold or offset; uplink-downlink collision; overlap of an uplink time resource and a downlink time resource; determining that the assistance information is to be set based on a periodicity and offset; configuring parameters for trigger conditions. In some embodiments, the assistance information can be sent via at least one of a Media Access Control (MAC) Control Element (CE) , a Physical Uplink Control Channel (PUCCH) , a Physical Uplink Shared Channel (PUSCH) , a Configured Grant (CG) , or a Physical Random Access Channel (PRACH) .
[0008] In some embodiments, the wireless communication device may receive an indication at least one of: a TA variation threshold or offset; an RTT variation threshold or offset; a Koffset variation threshold or offset; an elevation angle threshold; a priority of a UL or DL transmission; whether a UL or DL transmission is cell-specific or UE-specific; or offset value when UE adapt timing of UL or DL transmission configured by higher layers. The indication can be via at least one of an system information (SIB) broadcast, a RRC signaling, or a MAC CE.
[0009] In some embodiments, the wireless communication device may restrict a monitoring for a downlink signal. The updated monitoring restriction may comprise: restricted from monitoring the downlink signal in a time resource for an uplink transmission; or postponing a time window or a start time of monitoring the downlink signal to a time-domain resource for a downlink transmission, wherein a start time of the time window is within an uplink time resource. In some embodiments, the wireless communication device may not perform one of an uplink transmission or a downlink reception in response to overlap between uplink and downlink resources.
[0010] In some embodiments, the wireless communication device may cancel or drop downlink reception in response to determining that a downlink resource for the downlink reception overlaps with an uplink resource for an uplink transmission. The wireless communication device may cancel or drop downlink reception in response to determining that a downlink resource for the downlink reception overlaps with an uplink resource for an uplink transmission. The wireless communication device may cancel or drop uplink reception in response to determining that an uplink resource for the uplink reception overlaps with a downlink resource for a downlink transmission. In some embodiments, the wireless communication device may cancel or drop a downlink reception. The downlink reception can be configured by a higher layer parameter in a downlink resource, and an uplink resource can be configured by a Downlink Control Information (DCI) to be used to transmit an uplink transmission. The uplink resource may overlap with the downlink resource. The wireless communication device may cancel or drop an uplink reception. The uplink reception can be configured by a higher layer parameter in an uplink resource, and a downlink resource is configured by a DCI to be used to receive a downlink transmission. The uplink resource may overlap with the downlink resource. The wireless communication device may cancel or drop an uplink reception. The uplink reception can be configured by a DCI in an uplink resource, and a downlink resource is indicated to be used to receive a downlink transmission, the uplink resource overlaps with the downlink resource. The wireless communication device may cancel or drop an uplink reception or a downlink reception, wherein the uplink reception is configured by a higher layer parameter in an uplink resource, and a downlink resource is indicated to be used to receive the downlink transmission, the uplink resource overlaps with the downlink resource.
[0011] In some embodiments, the wireless communication device may indicate a collision between an uplink transmission and a downlink reception to the network node. The wireless communication device may report a Negative Acknowledgement (NACK) for a downlink reception in an uplink reception which collide with the downlink reception to the network node. The wireless communication device may report, to the network node, a NACK for an uplink reception in feedback for a downlink reception which collide with the downlink reception. In some embodiments, the wireless communication device may identify at least one flexible time-domain resource to be used for uplink transmission or downlink reception. The wireless communication device may send a request for configuring the at least one flexible time-domain resource to the network node. The wireless communication device may receive an indication of configuration of the at least one flexible time-domain resource from the network node.
[0012] In some embodiments, the wireless communication device may identify at least one flexible time-domain resource to be used for uplink transmission or downlink reception. The wireless communication device may use the at least one flexible time-domain resource for the uplink transmission or the downlink reception without scheduling. In some embodiments, the wireless communication device may change timing of a UL transmission configured by higher layer parameters. The changing timing can be in response to an event. The event may comprises at least one of: sending a TA report; a TA accuracy duration ending; a TA variation being above a threshold or offset; an RTT variation being above a threshold or offset; a Koffset variation being above a threshold or offset; a elevation angle changing to another value range; a elevation angle variation being above a threshold or offset; uplink-downlink collision; or overlap of an uplink time resource and a downlink time resource.
[0013] In some embodiments, a network node (e.g., a base station (BS) ) may receive assistance information for scheduling from a wireless communication device (e.g., a UE) . The assistance information can be in a TA report or in another report. In some embodiments, the network node may minimize uplink-downlink collision within a TA accuracy duration via scheduling, configuring and setting a guard interval for uplink and downlink communications between the wireless communication device and the network node. In some embodiments, the network node may perform at least one of: identifying time-domain resource on which collision occurs or may occur; identifying the uplink-downlink configuration, scheduling, or format or scheduling offset to minimize uplink-downlink collision or overlap between uplink and downlink resources, based on the reported assistance information; configuring the uplink-downlink configuration, scheduling, or format or the scheduling offset; configuring the uplink-downlink configuration, scheduling, or format or the scheduling offset based on a reported uplink-downlink configuration, scheduling, or format or reported scheduling offset received from the wireless communication device; sending to the wireless communication device acknowledgement to apply the reported uplink-downlink configuration, scheduling, or format or the reported scheduling offset received from wireless communication device; using the reported uplink-downlink configuration, scheduling, or format or the reported scheduling offset received from wireless communication device without sending the acknowledgement or indication; indicating to the wireless communication device an index or identifier of a candidate uplink-downlink configuration, scheduling, or format or scheduling offset. In some embodiments, the network node may perform at least one of: configuring at least one of an offset or periodicity of a semi-persistent transmission; or configuring at least one of a monitoring occasion or a resource for a downlink channel configured by a higher layer parameter.BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Various example embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for purposes of illustration only and merely depict example embodiments of the present solution to facilitate the reader's understanding of the present solution. Therefore, the drawings should not be considered limiting of the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, these drawings are not necessarily drawn to scale.
[0015] FIG. 1 illustrates an example cellular communication network in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure;
[0016] FIG. 2 illustrates a block diagram of an example base station and a user equipment device, in accordance with some embodiments of the present disclosure;
[0017] FIG. 3 illustrates an example implementation of satellite communication, in accordance with some embodiments of the present disclosure;
[0018] FIG. 4 illustrates an example uplink (UL) –downlink (DL) collision due to timing advance (TA) drift, in accordance with some embodiments of the present disclosure;
[0019] FIG. 5 illustrates an example timing advance report media access control control element (MAC CE) , in accordance with some embodiments of the present disclosure; and
[0020] FIG. 6 illustrates a flow diagram of an example method for uplink-downlink duplex, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION
[0021] 1. Mobile Communication Technology and Environment
[0022] FIG. 1 illustrates an example wireless communication network, and / or system, 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure. In the following discussion, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of things (NB-IoT) network, and is herein referred to as “network 100. ” Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101. In FIG. 1, the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126. Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
[0023] For example, the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively. Each radio frame 118 / 124 may be further divided into sub-frames 120 / 127 which may include data symbols 122 / 128. In the present disclosure, the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communications, in accordance with various embodiments of the present solution.
[0024] FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. The system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein. In one illustrative embodiment, system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of FIG. 1, as described above.
[0025] System 200 generally includes a base station 202 (hereinafter “BS 202” ) and a user equipment device 204 (hereinafter “UE 204” ) . The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
[0026] As would be understood by persons of ordinary skill in the art, system 200 may further include any number of modules other than the modules shown in FIG. 2. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software can depend upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.
[0027] In accordance with some embodiments, the UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion. Similarly, in accordance with some embodiments, the BS transceiver 210 may be referred to herein as a "downlink" transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuity that is coupled to the antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion. The operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
[0028] The UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212 / 232 that can support a particular wireless communication protocol and modulation scheme. In some illustrative embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
[0029] In accordance with various embodiments, the BS 202 may be an evolved node B (eNB) , a serving eNB, a target eNB, a femto station, or a pico station, for example. In some embodiments, the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, wearable computing device, etc. The processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
[0030] Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some embodiments, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
[0031] The network communication module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communication with the base station 202. For example, network communication module 218 may be configured to support internet or WiMAX traffic. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network. In this manner, the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) . The terms “configured for, ” “configured to” and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted and / or arranged to perform the specified operation or function.
[0032] The Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model” ) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model. In some embodiments, a first layer may be a physical layer. In some embodiments, a second layer may be a Medium Access Control (MAC) layer. In some embodiments, a third layer may be a Radio Link Control (RLC) layer. In some embodiments, a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer. In some embodiments, a fifth layer may be a Radio Resource Control (RRC) layer. In some embodiments, a sixth layer may be a Non Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
[0033] Various example embodiments of the present solution are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present solution. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the example embodiments and applications described and illustrated herein. Additionally, the specific order or hierarchy of steps in the methods disclosed herein are merely example approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present solution. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present solution is not limited to the specific order or hierarchy presented unless expressly stated otherwise.
[0034] 2. Systems and Methods for Uplink-Downlink Duplex
[0035] In wireless communication, high mobility scenario can be considered important in the evolution, e.g., NTN, high speed train, etc. Non-terrestrial networks (NTN) can be supported. However, only frequency division duplex (FDD) operation may be supported. For time division duplex (TDD) or half duplex (HD) -FDD case, UL and DL cannot be performed simultaneously so that UL and DL transmission collision can be avoided. With high mobility, a large round trip time (RTT) in NTN can vary fast and the UL-DL scheduling or configuration may need to be updated along with time. In order to adapt to the RTT variation, additional signaling and procedure are illustrated in this disclosure.
[0036] FIG. 3 illustrates an example implementation of satellite communication, in accordance with some embodiments of the present disclosure. The structure of transparent NTN is illustrated in FIG. 3. The link between a UE and a satellite is service link. The link between a BS and a satellite is feeder link and is common for all UEs within the same cell. For low orbit satellite, the mobility of satellite can be high, which leads to fast variation of RTT between a UE and a BS or an uplink time synchronization reference point.
[0037] In an NTN, pre-compensation can be applied for UL synchronization. The pre-compensation can be performed based on UE position, satellite ephemeris, or common TA parameters. Since UE position is not necessarily known by a BS, the BS may not know / be aware of the exact TA applied by the UE. In order to help BS properly configure and perform the scheduling, the UE may report a timing advance (TA) to the BS (with slot granularity) .
[0038] In TDD or HD-FDD, the UE may not perform UL and DL transmission simultaneously. As a result, the BS can perform proper scheduling to avoid the collision between UL and DL scheduling. For example in TDD, higher layer parameters TDD-UL-DL-ConfigCommon and TDD-UL-DL-ConfigDedicated can be configured to semi-statically indicate which set of slots and symbols are for UL or DL transmission. DCI 2_0 can be used to dynamically indicate slots and symbols for UL and DL transmissions.
[0039] Implementation Example 1: TA accuracy duration
[0040] A round trip time (RTT) between a UE and a BS may vary fast in high mobility scenario, e.g., in an NTN. In some embodiments, the RTT may be estimated as TA+Kmac. As a result, the time advance (TA) at the UE can also drift fast. If a fixed UL-DL scheduling pattern is used, collision may happen after a period of time due to the UL timing change. For example, as shown in FIG. 4, the scheduling of DL and UL transmission may have a fixed interval K to avoid collision at initial time (e.g., 1st time instance) . After a period of time, due to mobility of the satellite and the UE, the RTT between the UE and the BS can be varied and TA can drift accordingly. At 2nd time instance, the UL transmission may be further advanced to collide with downlink (DL) transmission if the same scheduling interval K is used. FIG. 4 illustrates an example uplink (UL) –downlink (DL) collision due to timing advance (TA) drift, in accordance with some embodiments of the present disclosure.
[0041] In some embodiments, the BS may not know the TA applied at the UE unless the UE reports it. In order to avoid the UL-DL collision as much as possible, the UE may additionally report the TA accuracy or the TA accuracy duration. For example, the UE may report at least one of following: a TA accuracy (e.g., Y ms) ; a TA accuracy duration (e.g., Z s) ; a reference time for TA report (e.g., the time associated with current or latest TA report) ; or a reference time for TA accuracy duration.
[0042] When the TA accuracy is not reported, the granularity of TA report may be considered as the accuracy. In some embodiments, the TA accuracy may be configured by the BS through at least one of: a system information block (SIB) broadcast, a dedicated RRC signaling, or a MAC CE signaling (instead of reported by the UE) . The TA accuracy may refer to an error bound or variation bound of TA. The reported TA is ensured with certain accuracy, e.g., the error or variation between reported TA and actual TA is within the bound, within the TA accuracy duration after a reference time. The reference time may be the end of message (e.g., start / end of ending slot for the message) carrying TA report, or the reported reference time for TA, or the end of message (e.g., start / end of ending slot for the message) carrying TA accuracy duration report, or the reported reference time for TA accuracy duration. During the TA accuracy duration, the BS may be able to avoid / manage / minimize UL-DL collision may proper UL-DL scheduling / configuration and / or setting proper guard interval between UL and DL transmissions. To reflect the TA accuracy duration, a timer or a time window may be defined.
[0043] The above information may be reported together or separately with the TA report. A TA report can be supported through timing advance report MAC CE, which may carry TA as shown below.
[0044] (1) The additional information illustrated above (e.g., TA accuracy duration, etc. ) can be reported together with the TA report, following solutions can be considered. In some embodiments, the current TA Report MAC CE can be enhanced by increasing the size and indicating additional information in the MAC CE. The reserved bit of TA report MAC CE or corresponding MAC subheader may be reinterpreted to indicate whether the MAC CE contain additional information (e.g., using at least one state to indicate the UE carrying additional information) . In some embodiments, the TA Report MAC CE may define a new enhanced TA Report MAC CE, which has larger size and may comprise TA as well as the additional information. The new enhanced TA Report MAC CE may be identified by MAC subheader with a new logical channel identity (LCID) / extended logical channel identity (eLCID) compared with legacy TA Report MAC CE. In some embodiments, the TA Report MAC CE may define at least one new MAC CE, which may comprise at least one of additional information. The new MAC CE may be indicated only when a TA Report MAC CE is present. The new MAC CE may be identified by MAC subheader with new LCID / eLCID. In some embodiments, the TA Report MAC CE may define at least one new MAC CE, which may comprise at least one of the additional information. The new MAC CE may be indicated only when legacy TA Report MAC CE is present. The reserved bit of TA Report MAC CE or corresponding MAC subheader may be reinterpreted to indicate whether the new MAC CE exists (e.g., using at least one state to indicate that new MAC CE for additional information is reported) .
[0045] (2) The additional information illustrated above is not reported together with TA report. At least one new MAC CE which comprises at least one of the additional information may be defined. The new MAC CE may be identified by MAC subheader with new LCID / eLCID. For example, one new MAC CE is defined, which includes all the additional information. For example, two new MAC CEs are defined, where one comprises the TA accuracy, while the other comprises TA accuracy duration and reference time. Different LCID / eLCID may be associated with different MAC CEs.
[0046] (3) The additional information illustrated above is not reported together with TA report. The additional information (e.g., TA accuracy duration, TA accuracy, etc. ) may be indicated to BS via a higher layer signaling or a RRC signaling, e.g., in msg5.
[0047] The reported TA accuracy duration and / or TA accuracy may be applicable to all TA report unless updated. In this case, the TA accuracy duration may be start / restart every time when TA is reported. More specifically, the reference time for TA accuracy duration for each TA report may be the end of message (e.g., start / end of ending slot for the message) carrying the TA report. The reported TA accuracy duration and / or TA accuracy may be applicable to only one TA report. In this case, when the additional information is not reported together with TA report and the reference time for TA accuracy duration is determined by TA report time, the reference time may be the end of message (e.g., start / end of ending slot for the message) carrying latest / next TA report.
[0048] As mentioned above, the UE and the BS may determine that the reported TA is ensured with certain accuracy within the TA accuracy duration and BS can avoid / minimize the UL-DL collision through scheduling or UL-DL configuration. When out of TA accuracy duration, the reported TA may not be accurate enough. And the BS may not able to handle the UL-DL collision caused by unknown TA applied by UE. Therefore, at least one of followings can be considered at / after end of TA accuracy duration: a TA report that is triggered / performed; a report of above additional information (e.g., TA accuracy duration, TA accuracy, reference time, etc. ) that is triggered / performed; a UL-DL configuration that is configured; or other assistance information for UL-DL configuration / scheduling / format (illustrated in implementation example 2) .
[0049] Implementation Example 2: Adaptive UL-DL configuration / scheduling / format
[0050] In a high mobility scenario (e.g., NTN) , the RTT between the UE and the BS may vary fast and TA can also drift correspondingly. Since the BS may not know / be aware of the TA applied by the UE, the UE may report assistance information to the BS for adaption of UL-DL configuration / scheduling / format, e.g., in TDD and HD-FDD scenario. The TA accuracy duration introduced in implementation example 1 can be thought as one type of assistance information. Besides the information introduced in implementation example 1 (e.g., TA accuracy duration, etc. ) , at least one of following assistance information may be reported by the UE: (1) collision indication (may comprise the slot / symbol where collision happens or may happen) ; (2) configuration or reconfiguration request (for UL-DL configuration / scheduling / format) ; (3) UL-DL configuration determined or suggested by the UE; (4) selected / suggested UL-DL configuration among candidate configurations, wherein the candidate configurations may be indicated / broadcast by the BS or predefined (e.g., in a table in standard) , the index / ID / ordinal of the configuration may be reported; (5) offset (for scheduling) determined or suggested by the UE; (6) selected / suggested offset (for scheduling) among candidate value, wherein the candidate values may be indicated / broadcast by BS or predefined (e.g., in a table in standard) , the index / ID / ordinal of the value may be reported; (7) elevation angle.
[0051] In some embodiments, the report of assistance information (including that introduced in implementation example 1) may be triggered based on followings. (1) The UE receives a trigger indication from the BS. The trigger indication may be sent by a DCI / PDCCH using a new DCI format or reinterpreting current DCI format. In some embodiments, the trigger indication may be sent using a MAC subheader (e.g., by using a LCID / eLCID) or MAC CE (e.g., new MAC CE or reinterpreting reserved bit of current MAC CE) . The trigger indication may comprise the time / frequency resource or grant information for assistance information report (e.g., time offset, time duration, time resource allocation, frequency offset, start frequency, bandwidth, frequency resource allocation, etc. ) (2) The report of assistance information may be triggered when indicated by upper layers to trigger a report. (3) The report of assistance information may be triggered when TA is reported. (4) The report of assistance information may be triggered when TA accuracy duration ends. (5) The report of assistance information may be triggered when TA variation (e.g., difference between current TA and previous reported TA) is above a threshold / offset (e.g., configured by network, or equal to TA accuracy illustrated previously) . (6) The report of assistance information may be triggered when elevation angle is changed, e.g., changed to another value range or variation is over a threshold / offset. (7) The report of assistance information may be triggered when UL-DL collision happens. (8) The report of assistance information may be triggered when UL time resource and DL time resource overlaps (with consideration of TA) . (9) The report of assistance information may be triggered periodically based on periodicity and offset configured by the BS. (10) The report of assistance information may be triggered when the parameters for trigger conditions are configured (e.g., TA accuracy duration, threshold / offset for TA variation, etc. ) .
[0052] In some embodiments, the assistance information may be sent via a media access control control element (MAC CE) , a physical uplink control channel (PUCCH) , a physical uplink shared channel (PUSCH) , a configured grant (CG) , or a physical random access channel (PRACH) . For example, assistance information may be sent via MAC subheader. New LCID / eLCID may be used. The existence of the MAC subheader or the LCID / eLCID codepoint may be used to indicate the assistance information, e.g., collision indication or configuration / reconfiguration request. For example, assistance information may be sent via MAC CE. Similar solutions as in embodiment-1 can be used. For example, assistance information may be sent in PUCCH. For example, sent in UCI / HARQ-ACK carried in PUCCH. The information may be indicated using certain bit field or certain state of existing bit field or cyclic shift. For example, assistance information may be sent in PUCSH. For example, when collision happens and PUSCH transmission is kept, the UE may indicate the collision in the PUSCH. Or BS may indicate a trigger indication which comprise the grant information of PUSCH, and UE report assistance information following the grant. For example, assistance information may be sent in CG. For example, BS configure periodic CG resource, and UE may report assistance information in the CG resource. For example, assistance information may be sent based on RACH. For example, when the report is triggered but UE is does not have grant for UL transmission, the UE may send PRACH to BS. The assistance information may be sent in RACH small data transmission (SDT) .
[0053] In some embodiments, when BS receive the assistance information, followings may be considered. (1) The BS may identify where collision happens or may happen. (2) The BS may identify which UL-DL configuration / scheduling / format or scheduling offset can avoid / minimize the UL-DL collision or overlap between UL and DL resources, based on the reported assistance information (e.g., reported TA, the slot / symbol where collision happens) . (3) The BS may configure the UL-DL configuration / scheduling / format or scheduling offset. This may be the follow-up of (1) or (2) . (4) The BS may configure the UL-DL configuration / scheduling / format or scheduling offset based on reported UL-DL configuration / scheduling / format or scheduling offset from the UE. (5) The BS may acknowledge UE to apply the UL-DL configuration / scheduling / format or scheduling offset reported by the UE. (6) The BS may directly use the UL-DL configuration / scheduling / format or scheduling offset reported by the UE without additional indication. (7) The BS may indicate the index / ID of candidate UL-DL configuration / scheduling / format or scheduling offset, which may be indicated / broadcast previously or predefined.
[0054] The BS may configuration / reconfiguration / acknowledgement for UL-DL configuration / scheduling / format or scheduling offset may be indicated via DCI, MAC CE, RRC signaling, or system information block (SIB) / master information block (MIB) broadcast. For example, the BS may configure UL-DL configuration via DCI 2_0, or TDD-UL-DL-ConfigDedicated via a RRC signaling, or TDD-UL-DL-ConfigCommon via a SIB / MIB broadcast. For another example, the UE may configure UL-DL configuration / scheduling / format or scheduling offset via a new MAC CE. Or UE may acknowledge the UE reported UL-DL configuration / scheduling / format or scheduling offset via a MAC subheader, a new MAC CE, or DCI. When using MAC subhead or MAC CE for indication, solutions mentioned above can be used. When using DCI for indication, a new DCI format may be defined.
[0055] Implementation Example 3: UE behavior when UL and DL collides
[0056] Although implementation example 1 provides solution to minimize the UL-DL collision caused by TA drift, the throughput may be degraded if BS allocate large guard interval to tolerate the TA drift. Therefore, it is possible that slight UL-DL collision may be allowed. The UE behaviors when UL-DL collision happens can also be investigated. And at least one of followings can be considered.
[0057] In some embodiments, the UE may select one of UL transmission and DL reception when UL-DL collision happens. For example, the UE may cancel / drop the DL reception when its resource overlaps with that for a UL transmission. The cancellation or drop may be whole DL reception or partial DL reception. If partial DL reception is dropped, the dropped part should be the overlapped part and / or some margin (e.g., a time margin corresponding to processing time before overlapped part and after overlapped part) . For example, the UE may cancel / drop the UL transmission when its resource overlaps with that for a DL reception. The cancellation or drop may be whole UL transmission (e.g., PUSCH, PUCCH, PRACH) or partial UL transmission (e.g., SRS) . If partial UL transmission is dropped, the dropped part should be the overlapped part and / or some margin (e.g., a time margin corresponding to processing time before overlapped part and after overlapped part) . For example, the UE may select to transmit or receive based on UE implementation when UL transmit resource and DL receiving resource overlap.
[0058] For above solutions, different solution may be applied for different scenarios (taking different types of signals and different scheduling methods into consideration) . For example, one of UL and DL signal is scheduled by DCI, while the other is scheduled by a higher layer parameter, the signal scheduled by higher layer parameter is cancelled / dropped. For another example, when one of UL and DL is for synchronization or initial access (e.g., SSB, PRACH) while the other is for data transmission (e.g., PUSCH, PDSCH) , the data transmission can be cancelled / dropped or up to UE to determine which one is cancelled. More specifically, following examples may be considered.
[0059] For example, when UE is configured by higher layer parameter to receive DL signal (e.g, PDCCH, or PDSCH, or CSI-RS, or DL PRS) in some time resource, and configured by DCI to transmit UL signal (e.g., PUSCH, or PUCCH, or PRACH, or SRS) in some time resource overlapped with DL time resource, the UE may cancel / drop the DL reception.
[0060] For example, when UE is configured by higher layer parameter to transmit UL signal (e.g., PUSCH, or PUCCH, or SRS) in some time resource, and configured by DCI to receive DL signal (e.g, PDSCH, or CSI-RS) in some time resource overlapped with UL time resource, the UE may cancel / drop the UL transmission. The drop may be performed in case there is enough processing time between the DCI and the DL resource. More specifically, the UE does not expect to cancel / drop the UL transmission in the resource if the first symbol in the resource occurs within Tproc, 2 relative to a last symbol of resource where UE detects the DCI; otherwise, the UE cancels / drops the UL transmission. Or the UE does not expect to cancel / drop the transmission in resources from the subset of resources that occur within Tproc, 2 relative to a last symbol of resource where UE detects the DCI. The UE cancels / drops the transmission in remaining resources from the subset of resources.
[0061] For example, when UE is indicated to transmit UL signal (e.g., PUSCH, or PUCCH, or SRS, or PRACH indicated by DCI) in some time resource, and indicated to receive DL signal (e.g., SSB) in some time resource overlapped with UL time resource, the UE may cancel / drop the UL transmission.
[0062] For example, when UE is configured by higher layer parameter to transmit UL PRACH or msgA PUSCH in some time resource, and indicated to receive DL signal in some time resource overlapped with UL time resource, it may be up to UE implementation to select to transmit or to receive.
[0063] For example, when the UE detects a DCI scheduling a reception in a set of resources, and detects a DCI scheduling a transmission, at least one of followings may be considered. (1) The UE cancels / drops the transmission if the resource of transmission overlaps with the set of resources. (2) The UE cancels / drops the transmission in resources that overlap with the set of resources. (3) The UE does not expect to cancel / drop the transmission if the first symbol of resource for transmission occurs within Tproc, 2 relative to a last symbol of resource where the UE detects the DCI scheduling the reception; otherwise, UE cancels / drops the transmission. (4) The UE does not expect to cancel / drop the transmission in resources that occur within Tproc, 2 relative to a last symbol of resource where UE detects the DCI scheduling the reception. The UE cancels / drops the transmission in remaining resources. (5) The UE does not transmit the transmission if a last symbol of the transmission would not be at least transition time prior to a first symbol of a reception (e.g., next reception) . UE does not transmit the transmission if a first symbol of the transmission would not be at least transition time after a last symbol of a reception (e.g., previous reception) . (6) The UE does not transmit the transmission in resources that would not be at least transition time prior to a first symbol of a reception (e.g., next reception) . UE does not transmit the transmission in resources that would not be at least transition time after a last symbol of a reception (e.g., previous reception) . (7) The UE does not receive the reception if the set of resource overlaps with resource of transmission. (8) The UE does not receive the reception in resources that overlap with resource of transmission. (9) The UE receives the reception if the first symbol of resource for reception occurs within Tproc, 2 relative to a last symbol of resource where the UE detects the DCI scheduling the transmission; otherwise, UE does not receive the reception. (10) The UE receives the reception in resources that occurs within Tproc, 2 relative to a last symbol of resource where the UE detects the DCI scheduling the transmission. The UE does not receive the reception in remaining resources. (11) The UE does not receive the reception if a last symbol of the reception would not be at least transition time prior to a first symbol of a transmission (e.g., next transmission) . The UE does not receive the reception if a first symbol of the reception would not be at least transition time after a last symbol of a transmission (e.g., previous transmission) . (12) The UE does not receive the reception in resources that would not be at least transition time prior to a first symbol of a transmission (e.g., next transmission) . The UE does not receive the reception in resources that would not be at least transition time after a last symbol of a transmission (e.g., previous transmission) . (13) The UE can select based on its implementation whether to either transmit the transmission or receive the reception.
[0064] For example, when the UE receives higher layer parameter configuring a reception in a set resources, and higher layer parameter configuring a transmission, at least one of followings may be considered. (1) The UE cancels / drops the transmission if the resource of transmission overlaps with the set of resources. (2) The UE cancels / drops the transmission in resources that overlap with the set of resources. (3) The UE does not transmit the transmission if a last symbol of the transmission can not be at least transition time prior to a first symbol of a reception (e.g., next reception) . The UE does not transmit the transmission if a first symbol of the transmission would not be at least transition time after a last symbol of a reception (e.g., previous reception) . (4) The UE does not transmit the transmission in resources that can not be at least transition time prior to a first symbol of a reception (e.g., next reception) . The UE does not transmit the transmission in resources that can not be at least transition time after a last symbol of a reception (e.g., previous reception) . (5) The UE does not receive the reception if the set of resource overlaps with resource of transmission. (6) The UE does not receive the reception in resources that overlap with resource of transmission. (7) The UE does not receive the reception if a last symbol of the reception can not be at least transition time prior to a first symbol of a transmission (e.g., next transmission) . The UE does not receive the reception if a first symbol of the reception can not be at least transition time after a last symbol of a transmission (e.g., previous transmission) . (8) The UE does not receive the reception in resources that can not be at least transition time prior to a first symbol of a transmission (e.g., next transmission ) . The UE does not receive the reception in resources that can not be at least transition time after a last symbol of a transmission (e.g., previous transmission) . (9) The UE can select based on its implementation whether to either transmit the transmission or receive the reception.
[0065] For example, when the UE receives a CSS set configuration (e.g., Type-0 / 0A / 1 / 2-PDCCH) for PDCCH reception in a set of resources, and higher layer parameter configuring a transmission, at least one of followings may be considered. (1) The UE cancels / drops the transmission if the resource of transmission overlaps with the set of resources. (2) The UE cancels / drops the transmission in resources that overlap with the set of resources. (3) The UE does not transmit the transmission if a last symbol of the transmission would not be at least transition time prior to a first symbol of a PDCCH reception (e.g., next reception) . The UE does not transmit the transmission if a first symbol of the transmission can not be at least transition time after a last symbol of a PDCCH reception (e.g., previous reception) . (4) The UE does not transmit the transmission in resources that can not be at least transition time prior to a first symbol of a PDCCH reception (e.g., next reception) . The UE does not transmit the transmission in resources that would not be at least transition time after a last symbol of a PDCCH reception (e.g., previous reception) . (5) The UE does not receive the PDCCH reception if the set of resource overlaps with resource of transmission. (6) The UE does not receive the PDCCH reception in resources that overlap with resource of transmission. (7) The UE does not receive the reception if a last symbol of the PDCCH reception would not be at least transition time prior to a first symbol of a transmission (e.g., next transmission) . The UE does not receive the reception if a first symbol of the PDCCH reception would not be at least transition time after a last symbol of a transmission (e.g., previous transmission) . (8) The UE does not receive the PDCCH reception in resources that can not be at least transition time prior to a first symbol of a transmission (e.g., next transmission ) . The UE does not receive the PDCCH reception in resources that can not be at least transition time after a last symbol of a transmission (e.g., previous transmission) . (9) The UE can select based on its implementation whether to either transmit the transmission or receive the PDCCH reception.
[0066] In some embodiments, the UE may indicate gNB the collision (to help gNB configure the UL-DL configuration) . For example, the UE may indicate the collision explicitly. Moreover, the UE may report TA or a suggested time resource / offset when collision happens. In some embodiments, the UE may directly request to configure UL or DL. The indication may follow the ways mentioned in implementation example-1, e.g., in MAC CE. For example, the UE may implicitly indicate the collision by reporting NACK for dropped DL in the UL transmission (collided with the dropped DL) . For example, the UE may implicitly indicate the collision by reporting NACK for dropped UL in the HARQ-ACK for the DL transmission (collided with the dropped UL) .
[0067] In TDD, flexible symbols / slots can be configured between DL and UL symbols / slots. The flexible symbols / slots can be either used to perform UL transmission or DL transmission depending on the scheduling by network node. Moreover, the network node can configure the flexible symbols / slots to UL or DL symbols / slots through RRC or DCI configurations. Overall, how to use the flexible symbols / slots can be up to network node determination. However, for NTN scenarios mentioned in this disclosure, where TA or UE-gNB RTT drift fast and may be unknown by network, it may be more efficient to let UE determine the use of flexible symbols / slots.
[0068] For example, the network may configure TDD-UL-DL-ConfigCommon (or TDD-UL-DL-ConfigCommon and TDD-UL-DL-ConfigDedicated) . The UE may identify which of flexible symbols / slots can be used for UL or DL. The UE may send request to network to configure some flexible symbols / slots, e.g., identified by UE that can be used for UL, to UL symbols / slots or request to network to configure some flexible symbols / slots, e.g., identified by the UE that can be used for DL, to DL symbols / slots. The network may receive the request from the UE. The network may configure some flexible symbols / slots, e.g., requested by the UE, to UL or DL symbols / slots. The configuration may be indicated via TDD-UL-DL-ConfigDedicated or DCI 2_0.
[0069] For example, the network may configure TDD-UL-DL-ConfigCommon (or TDD-UL-DL-ConfigCommon and TDD-UL-DL-ConfigDedicated) . The UE may identify which of flexible symbols / slots can be used for UL or DL. The UE may autonomously use some flexible symbols / slots, e.g., identified by UE that can be used for UL, for UL transmission. The UL transmission may be triggered by a higher layer of the UE or based on higher layer configuration.
[0070] The UE may identify which flexible symbols / slots can be used for UL based on at least one of TA, RTT, elevation angle, start / end of first / last symbol of DL, etc. For HD-UE, when uplink and downlink transmission intervals is no larger than certain value, some transmission may not be performed. For example, following cases are specified.
[0071] (1) PUSCH / PUCCH / SRS based on a higher layer configuration vs SSB
[0072] (2) PDCCH / PDSCH / CSI-RS / DL PRS based on a higher layer configuration or a SSB vs PRACH / msgA PUSCH triggered by a higher layer
[0073] (3) SRS / PUCCH / PUSCH based on higher layer configuration vs CSI-RS / PDSCH based on DCI
[0074] In a TN, UL and DL subframes can be aligned. However, in scenario where TA or RTT between UE and network node is larger, there may be ambiguity on whether the timing is illustrated in absolute time interval / offset or logic time interval / offset considering that UL and DL subframes may not be aligned. The followings may be considered.
[0075] In some embodiments, a TA can be taken into account. In some embodiments, a UE-gNB RTT can be taken into account. The UE-gNB RTT may be calculated as TA+Kmac. In some embodiments, NTx-Rx is the transition time from transmission to reception. In some embodiments, NRx-Tx is the transition time from reception to transmission. In some embodiments, Tproc, 2 is the processing time for a transmission.
[0076] In some embodiments, assuming TA=0, or logical timing is used, the NTx-Rx·Tc can be updated to one of followings. For example, NTx-Rx·Tc-TA, where TA is the TA. For example, NTx-Rx·Tc-RTT, where RTT is the UE-gNB RTT and may be calculated as TA+Kmac, Kmac is the RTT between gNB and uplink time synchronization reference point. For example, NTx-Rx·Tc-Koffset, cell·TKoffset, where Koffset, cell is the cell specific Koffset, TKoffset is the time unit of Koffset and may be expressed as TKoffset=Nslot·Tc and Nslot is equal to the time length of a (reference) slot in unit of Tc. For example, NTx-Rx·Tc-Koffset, cell·TKoffset-Kmac·TKmac, where Kmac is the RTT between gNB and uplink time synchronization reference point, TKmac is the time unit of Koffset and may be expressed as TKmac=Nslot·Tc.
[0077] In some embodiments, NRx-Tx·Tc can be updated to one of followings: NRx-Tx·Tc+TA; NRx-Tx·Tc+RTT; NRx-Tx·Tc+Koffset, cell·TKoffset; or NRx-Tx·Tc+Koffset, cell·TKoffset+Kmac·TKmac. In some embodiments, Tproc, 2 can be updated to one of followings: NTx-Rx·Tc+TA; NTx-Rx·Tc+RTT; NTx-Rx·Tc+Koffset, cell·TKoffset; or NTx-Rx·Tc+Koffset, cell·TKoffset+Kmac·TKmac.
[0078] In some embodiments, uplink and downlink transmission intervals are zero. For example, following case is specified.
[0079] In some embodiments, assuming TA=0, or logical timing is used, when a HD-UE is to receive a DL in a set of symbols, the symbols for UL transmission may be updated to any symbol X that overlap with the set of symbols after delaying TA, or delaying RTT, or delaying Koffset, cell·TKoffset, or delaying Koffset, cell·TKoffset+Kmac·TKmac.
[0080] Implementation Example 4: Adaption of semi-static configuration
[0081] UL transmission or DL reception can be configured by higher layers, e.g., semi-static UL transmission or semi-static DL reception is supported. For semi-static UL transmission or DL reception, the configuration may be applied for a long time. As a result, the timing variation range can be large and collision is more likely to happen. In this case, adaption of the semi-static configuration is necessary. And following solutions can be considered.
[0082] Example 1: Network node configure the semi-static configuration based on cell-specific parameters. For example, the network identify whether collision will happen based on cell-specific Koffset or Kmac or sum of them. Network node can configured / reconfigure the semi-static UL or semi-static DL transmission (when cell-specific Koffset or Kmac or sum of them is changed over a threshold) .
[0083] Example 2: Network node configure the semi-static configuration based on UE assistance information. Network may receive assistance information from UE (e.g., TA, TA accuracy information, elevation angle, etc. ) . Network identify whether collision can happen based on UE assistance information (e.g., whether TA is changed over a threshold, whether TA accuracy duration is expired, whether elevation angle is above / below a threshold, etc. ) . Network node will configured / reconfigure the semi-static UL or semi-static DL transmission (when identify that collision may happen) . To achieve this example, the UE may support report of assistance information as mentioned in previous implementation example.
[0084] Example 3: Network node configure the semi-static configuration based on UE request / indication. UE may identify whether collision can happen, e.g., by checking whether resources of semi-static UL and DL overlap. When UE identifies that collision may happen, it may send network a collision indication or configuration / reconfiguration request of UL or DL configuration. To achieve this example, UE may support report of collision indication or configuration / reconfiguration request as mentioned in previous implementation example.
[0085] Example 4: The UE autonomously adapt the semi-static configuration. For example, for semi-static UL transmission UE can offset the timing by TA / RTT / Koffset. For another example, when an event happens, the UE can offset the timing of semit-static UL or DL transmission. The event may comprise: (1) TA variation (between current TA and TA of previous configuration of UL / DL transmission) reaches or is over a threshold; (2) RTT variation (between current RTT and RTT of previous configuration of UL / DL transmission) reaches or is over a threshold; (3) Koffset variation (between current Koffset and Koffset of previous configuration of UL / DL transmission) reaches or is over a threshold; (4) elevation angle reaches or is over a threshold; (5) TA report. The offset of timing may be full or fraction of TA / RTT / Koffset. Or the offset may be equal to the TA / RTT / Koffset threshold. Or the offset may be a value configured by network node. Or the offset may be predefined.
[0086] Example 5: For semi-static UL transmission, TA is not applied or TA pre-compensation is not applied.
[0087] Moreover, it is worth noting that the semi-static UL or DL transmission may be cell-specific or UE-specific. When a cell-specific transmission collides with a UE-specific transmission, the cell-specific transmission may be prioritized. For example, when the resource of a cell-specific DL transmission overlaps with the resource of a UE-specific UL transmission, the UL transmission is cancelled / postponed / not transmitted. When the resource of a UE-specific DL transmission overlaps with the resource of a cell-specific UL transmission, the UL transmission is countinued / transmitted or not cancelled, or the DL transmission is not received. Since UE may not able to know whether a UL or DL configuration is cell-specific or UE specific, network node may indicate the priority of a semi-static UL or DL transmission or whether the configuration is cell-specific or UE-specific. The indication may be included in the semi-static UL or DL configuration. In some embodiments, the indication is via another signal, e.g., RRC signaling or MAC CE, as illustrated in previous implementation examples.
[0088] It should be understood that one or more features from the above / following implementation examples are not exclusive to the specific implementation examples, but can be combined in any manner (e.g., in any priority and / or order, concurrently or otherwise) .
[0089] FIG. 6 illustrates a flow diagram of a method 600 for uplink-downlink duplex. The method 600 may be implemented using any one or more of the components and devices detailed herein in conjunction with FIGs. 1–5. In overview, the method 600 may be performed by a UE, in some embodiments. Additional, fewer, or different operations may be performed in the method 600 depending on the embodiment. At least one aspect of the operations is directed to a system, method, apparatus, or a computer-readable medium.
[0090] A wireless communication device (e.g., a user equipment (UE) ) may send an assistance information for scheduling to a network node. In some embodiments, the assistance information may comprise at least one of: a TA accuracy or error bound; a timing advance (TA) accuracy duration; a reference time for the TA accuracy duration; or a reference time for a TA report; a collision indication; a time-domain resource on which collision may occur; a configuration request for uplink-downlink configuration; a configuration request for semi-static uplink or downlink transmission; an elevation angle; an round-trip time; an uplink downlink configuration, scheduling, or format; an uplink downlink configuration, scheduling, or format index from a plurality of candidate configurations; an offset for the uplink and downlink scheduling; or an offset index from a plurality of candidate values.
[0091] In some embodiments, the assistance information can be in a TA report or in another report. In some embodiments, a granularity of the TA report may correspond to a TA accuracy of the TA. The TA accuracy can be configured by the network node to the wireless communication via broadcast or signaling. A reference time for a TA report may comprise at least one of an end of a message carrying the TA report, a reported reference time for the TA, an end of a message carrying TA accuracy duration, or a reported reference time for the TA accuracy duration. In some embodiments, a size of a first message carrying the TA report can be greater than a size of a second message carrying another TA without associated assistance information, at least one of a reserved bit or a subheader can be configured to indicate whether the first message is carrying the assistance information. A size of a first message carrying the TA report can be greater than a size of a second message carrying another TA without associated assistance information, at least one of a Logical Channel Identity (LCID) or an Extended Logical Channel Identity (eLCID) is to identify the first message. A message may comprise the assistance information, at least one of an LCID or an eLCID is to identify the message. A first message may comprise the assistance information. At least one of a reserved bit or a subheader of a second message can be configured to indicate whether the message is carrying the assistance information.
[0092] In some embodiments, the wireless communication device may send the another report comprising the assistance information to the network node. The another report can be different from the TA report. The another report comprising the assistance information can be carried in a message, and at least one of a Logical Channel Identity (LCID) or an Extended Logical Channel Identity (eLCID) of the message is to identify the message. The another report comprising the assistance information can be carried in two or more messages, a first message comprises a first type of the assistance information and is identified using a first LCID or eLCID, and a second message comprises a second type of the assistance information and is identified using a second LCID or eLCID. The another report comprising the assistance information can be indicated to the network node via at least one of higher layer signaling or Radio Resource Control (RRC) signaling. In some embodiments, the wireless communication device may send a TA accuracy duration of the TA to the network node. At an end of the TA accuracy duration or after the TA accuracy duration, at least one of: the wireless communication device is triggered to send another TA report; the wireless communication device is triggered to send assistance information; uplink-downlink configuration, scheduling, or format is configured; or the wireless communication device is triggered to report assistance information for the uplink-downlink configuration, the scheduling, or the format.
[0093] In some embodiments, the wireless communication device may send the assistance information in response to at least one of: receiving a trigger indication from the network node, the trigger indication comprising a time frequency resource or grant information for sending the assistance information; receiving a trigger indication from the network node via upper layer signaling; sending a TA report; a TA accuracy duration ending; a TA variation being above a threshold or offset, wherein the TA variation comprises a difference between a current TA and previous reported TA; an RTT variation being above a threshold or offset; a Koffset variation being above a threshold or offset; a elevation angle changing to another value range; a elevation angle variation being above a threshold or offset; uplink-downlink collision; overlap of an uplink time resource and a downlink time resource; determining that the assistance information is to be set based on a periodicity and offset; configuring parameters for trigger conditions. In some embodiments, the assistance information can be sent via at least one of a Media Access Control (MAC) Control Element (CE) , a Physical Uplink Control Channel (PUCCH) , a Physical Uplink Shared Channel (PUSCH) , a Configured Grant (CG) , or a Physical Random Access Channel (PRACH) .
[0094] In some embodiments, the wireless communication device may receive an indication at least one of: a TA variation threshold or offset; an RTT variation threshold or offset; a Koffset variation threshold or offset; an elevation angle threshold; a priority of a UL or DL transmission; whether a UL or DL transmission is cell-specific or UE-specific; or offset value when UE adapt timing of UL or DL transmission configured by higher layers. The indication can be via at least one of an system information (SIB) broadcast, a RRC signaling, or a MAC CE.
[0095] In some embodiments, the wireless communication device may restrict a monitoring for a downlink signal. The updated monitoring restriction may comprise: restricted from monitoring the downlink signal in a time resource for an uplink transmission; or postponing a time window or a start time of monitoring the downlink signal to a time-domain resource for a downlink transmission, wherein a start time of the time window is within an uplink time resource. In some embodiments, the wireless communication device may not perform one of an uplink transmission or a downlink reception in response to overlap between uplink and downlink resources.
[0096] In some embodiments, the wireless communication device may cancel or drop downlink reception in response to determining that a downlink resource for the downlink reception overlaps with an uplink resource for an uplink transmission. The wireless communication device may cancel or drop downlink reception in response to determining that a downlink resource for the downlink reception overlaps with an uplink resource for an uplink transmission. The wireless communication device may cancel or drop uplink reception in response to determining that an uplink resource for the uplink reception overlaps with a downlink resource for a downlink transmission. In some embodiments, the wireless communication device may cancel or drop a downlink reception. The downlink reception can be configured by a higher layer parameter in a downlink resource, and an uplink resource can be configured by a Downlink Control Information (DCI) to be used to transmit an uplink transmission. The uplink resource may overlap with the downlink resource. The wireless communication device may cancel or drop an uplink reception. The uplink reception can be configured by a higher layer parameter in an uplink resource, and a downlink resource is configured by a DCI to be used to receive a downlink transmission. The uplink resource may overlap with the downlink resource. The wireless communication device may cancel or drop an uplink reception. The uplink reception can be configured by a DCI in an uplink resource, and a downlink resource is indicated to be used to receive a downlink transmission, the uplink resource overlaps with the downlink resource. The wireless communication device may cancel or drop an uplink reception or a downlink reception, wherein the uplink reception is configured by a higher layer parameter in an uplink resource, and a downlink resource is indicated to be used to receive the downlink transmission, the uplink resource overlaps with the downlink resource.
[0097] In some embodiments, the wireless communication device may indicate a collision between an uplink transmission and a downlink reception to the network node. The wireless communication device may report a Negative Acknowledgement (NACK) for a downlink reception in an uplink reception which collide with the downlink reception to the network node. The wireless communication device may report, to the network node, a NACK for an uplink reception in feedback for a downlink reception which collide with the downlink reception. In some embodiments, the wireless communication device may identify at least one flexible time-domain resource to be used for uplink transmission or downlink reception. The wireless communication device may send a request for configuring the at least one flexible time-domain resource to the network node. The wireless communication device may receive an indication of configuration of the at least one flexible time-domain resource from the network node.
[0098] In some embodiments, the wireless communication device may identify at least one flexible time-domain resource to be used for uplink transmission or downlink reception. The wireless communication device may use the at least one flexible time-domain resource for the uplink transmission or the downlink reception without scheduling. In some embodiments, the wireless communication device may change timing of a UL transmission configured by higher layer parameters. The changing timing can be in response to an event. The event may comprises at least one of: sending a TA report; a TA accuracy duration ending; a TA variation being above a threshold or offset; an RTT variation being above a threshold or offset; a Koffset variation being above a threshold or offset; a elevation angle changing to another value range; a elevation angle variation being above a threshold or offset; uplink-downlink collision; or overlap of an uplink time resource and a downlink time resource.
[0099] In some embodiments, a network node (e.g., a base station (BS) ) may receive assistance information for scheduling from a wireless communication device (e.g., a UE) . The assistance information can be in a TA report or in another report. In some embodiments, the network node may minimize uplink-downlink collision within a TA accuracy duration via scheduling, configuring and setting a guard interval for uplink and downlink communications between the wireless communication device and the network node. In some embodiments, the network node may perform at least one of: identifying time-domain resource on which collision occurs or may occur; identifying the uplink-downlink configuration, scheduling, or format or scheduling offset to minimize uplink-downlink collision or overlap between uplink and downlink resources, based on the reported assistance information; configuring the uplink-downlink configuration, scheduling, or format or the scheduling offset; configuring the uplink-downlink configuration, scheduling, or format or the scheduling offset based on a reported uplink-downlink configuration, scheduling, or format or reported scheduling offset received from the wireless communication device; sending to the wireless communication device acknowledgement to apply the reported uplink-downlink configuration, scheduling, or format or the reported scheduling offset received from wireless communication device; using the reported uplink-downlink configuration, scheduling, or format or the reported scheduling offset received from wireless communication device without sending the acknowledgement or indication; indicating to the wireless communication device an index or identifier of a candidate uplink-downlink configuration, scheduling, or format or scheduling offset. In some embodiments, the network node may perform at least one of: configuring at least one of an offset or periodicity of a semi-persistent transmission; or configuring at least one of a monitoring occasion or a resource for a downlink channel configured by a higher layer parameter.
[0100] While various embodiments of the present solution have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. Likewise, the various diagrams may depict an example architectural or configuration, which are provided to enable persons of ordinary skill in the art to understand example features and functions of the present solution. Such persons would understand, however, that the solution is not restricted to the illustrated example architectures or configurations, but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described illustrative embodiments.
[0101] It is also understood that any reference to an element herein using a designation such as "first, " "second, " and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
[0102] Additionally, a person having ordinary skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits and symbols, for example, which may be referenced in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0103] A person of ordinary skill in the art would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software" or a "software module) , or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure.
[0104] Furthermore, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can include a general purpose processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logical blocks, modules, and circuits can further include antennas and / or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
[0105] If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
[0106] In this document, the term "module" as used herein, refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the present solution.
[0107] Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that, for clarity purposes, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functionality illustrated to be performed by separate processing logic elements, or controllers, may be performed by the same processing logic element, or controller. Hence, references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.
[0108] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.
Claims
1.A method, comprising:sending, by a wireless communication device to a network node, an assistance information for scheduling.2.The method of claim 1, wherein the assistance information comprises at least one of:a TA accuracy or error bound;a TA accuracy duration;a reference time for the TA accuracy duration; ora reference time for a TA report;a collision indication;a time-domain resource on which collision may occur;a configuration request for uplink-downlink configuration;a configuration request for semi-static uplink or downlink transmission;an elevation angle;an round-trip time;an uplink downlink configuration, scheduling, or format;an uplink downlink configuration, scheduling, or format index from a plurality of candidate configurations;an offset for the uplink and downlink scheduling; oran offset index from a plurality of candidate values.3.The method of claim 1, wherein the assistance information is in a TA report or in another report.4.The method of claim 3, wherein at least one of:a granularity of the TA report corresponds to a TA accuracy of the TA;the TA accuracy is configured by the network node to the wireless communication via broadcast or signaling;a reference time for a TA report comprises at least one of an end of a message carrying the TA report, a reported reference time for the TA, an end of a message carrying TA accuracy duration, or a reported reference time for the TA accuracy duration.5.The method of claim 3, whereinat least one of:a size of a first message carrying the TA report is greater than a size of a second message carrying another TA without associated assistance information, at least one of a reserved bit or a subheader is configured to indicate whether the first message is carrying the assistance information;a size of a first message carrying the TA report is greater than a size of a second message carrying another TA without associated assistance information, at least one of a Logical Channel Identity (LCID) or an Extended Logical Channel Identity (eLCID) is to identify the first message;a message comprises the assistance information, at least one of an LCID or an eLCID is to identify the message; ora first message comprises the assistance information, at least one of a reserved bit or a subheader of a second message is configured to indicate whether the message is carrying the assistance information.6.The method of claim 3, further comprising sending, by the wireless communication device to the network node, the another report comprising the assistance information, wherein the another report is different from the TA report, and at least one of:the another report comprising the assistance information is carried in a message, and at least one of a Logical Channel Identity (LCID) or an Extended Logical Channel Identity (eLCID) of the message is to identify the message;the another report comprising the assistance information is carried in two or more messages, a first message comprises a first type of the assistance information and is identified using a first LCID or eLCID, and a second message comprises a second type of the assistance information and is identified using a second LCID or eLCID; orthe another report comprising the assistance information is indicated to the network node via at least one of higher layer signaling or Radio Resource Control (RRC) signaling.7.The method of claim 3, further comprising sending, by the wireless communication device to the network node, a TA accuracy duration of the TA, wherein at an end of the TA accuracy duration or after the TA accuracy duration, at least one of:the wireless communication device is triggered to send another TA report;the wireless communication device is triggered to send assistance information;uplink-downlink configuration, scheduling, or format is configured; orthe wireless communication device is triggered to report assistance information for the uplink-downlink configuration, the scheduling, or the format.8.The method of claim 1, wherein the wireless communication device sends the assistance information in response to at least one of:receiving a trigger indication from the network node, the trigger indication comprising a time frequency resource or grant information for sending the assistance information;receiving a trigger indication from the network node via upper layer signaling;sending a TA report;a TA accuracy duration ending;a TA variation being above a threshold or offset, wherein the TA variation comprises a difference between a current TA and previous reported TA;an RTT variation being above a threshold or offset;a Koffset variation being above a threshold or offset;a elevation angle changing to another value range;a elevation angle variation being above a threshold or offset;uplink-downlink collision;overlap of an uplink time resource and a downlink time resource;determining that the assistance information is to be set based on a periodicity and offset;configuring parameters for trigger conditions.9.The method of claim 1, wherein the assistance information is sent via at least one of a Media Access Control (MAC) Control Element (CE) , a Physical Uplink Control Channel (PUCCH) , a Physical Uplink Shared Channel (PUSCH) , a Configured Grant (CG) , or a Physical Random Access Channel (PRACH) .10.The method of claim 1, further comprising receiving, by the wireless communication device, an indication at least one of:a TA variation threshold or offset;an RTT variation threshold or offset;a Koffset variation threshold or offset;an elevation angle threshold;a priority of a UL or DL transmission;whether a UL or DL transmission is cell-specific or UE-specific; oroffset value when UE adapt timing of UL or DL transmission configured by higher layers.11.The method of claim 10, wherein the indication is via at least one of an system information (SIB) broadcast, a RRC signaling, or a MAC CE.12.The method of claim 1, further comprising restricting, by the wireless communication device, a monitoring for a downlink signal.13.The method of claim 12, wherein the updated monitoring restriction comprises:restricted from monitoring the downlink signal in a time resource for an uplink transmission; orpostponing a time window or a start time of monitoring the downlink signal to a time-domain resource for a downlink transmission, wherein a start time of the time window is within an uplink time resource.14.The method of claim 1, further comprising not performing one of an uplink transmission or a downlink reception in response to overlap between uplink and downlink resources.15.The method of claim 1, further comprising at least one of:canceling or dropping downlink reception in response to determining that a downlink resource for the downlink reception overlaps with an uplink resource for an uplink transmission;canceling or dropping downlink reception in response to determining that a downlink resource for the downlink reception overlaps with an uplink resource for an uplink transmission; orcanceling or dropping uplink reception in response to determining that an uplink resource for the uplink reception overlaps with a downlink resource for a downlink transmission.16.The method of claim 1, further comprising at least one of:canceling or dropping a downlink reception, wherein the downlink reception is configured by a higher layer parameter in a downlink resource, and an uplink resource is configured by a Downlink Control Information (DCI) to be used to transmit an uplink transmission, the uplink resource overlaps with the downlink resource;canceling or dropping an uplink reception, wherein the uplink reception is configured by a higher layer parameter in an uplink resource, and a downlink resource is configured by a DCI to be used to receive a downlink transmission, the uplink resource overlaps with the downlink resource;canceling or dropping an uplink reception, wherein the uplink reception is configured by a DCI in an uplink resource, and a downlink resource is indicated to be used to receive a downlink transmission, the uplink resource overlaps with the downlink resource; orcanceling or dropping an uplink reception or a downlink reception, wherein the uplink reception is configured by a higher layer parameter in an uplink resource, and a downlink resource is indicated to be used to receive the downlink transmission, the uplink resource overlaps with the downlink resource.17.The method of claim 1, further comprising at least one of:indicating, by the wireless communication device to the network node, a collision between an uplink transmission and a downlink reception;reporting, by the wireless communication device to the network node, a Negative Acknowledgement (NACK) for a downlink reception in an uplink reception which collide with the downlink reception; orreporting, by the wireless communication device to the network node, a NACK for an uplink reception in feedback for a downlink reception which collide with the downlink reception.18.The method of claim 1, further comprising at least one of:identifying, by the wireless communication device, at least one flexible time-domain resource to be used for uplink transmission or downlink reception;sending, by the wireless communication device to the network node, a request for configuring the at least one flexible time-domain resource; orreceiving, by the wireless communication device from the network node, an indication of configuration of the at least one flexible time-domain resource.19.The method of claim 1, further comprising at least one of:identifying, by the wireless communication device, at least one flexible time-domain resource to be used for uplink transmission or downlink reception; orusing, by the wireless communication device, the at least one flexible time-domain resource for the uplink transmission or the downlink reception without scheduling.20.The method of claim 1, further comprising changing, by the wireless communication device, timing of a UL transmission configured by higher layer parameters.21.The method of claim 20, wherein the changing timing is in response to an event.22.The method of claim 21, wherein the event comprises at least one of:sending a TA report;a TA accuracy duration ending;a TA variation being above a threshold or offset;an RTT variation being above a threshold or offset;a Koffset variation being above a threshold or offset;a elevation angle changing to another value range;a elevation angle variation being above a threshold or offset;uplink-downlink collision; oroverlap of an uplink time resource and a downlink time resource.23.A wireless communication 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 the method recited in claim 1.24.A computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by at least one processor, causing the at least one processor to implement the method recited in claim 1.25.A method, comprising:receiving, by a network node from a wireless communication device, assistance information for scheduling.26.The method of claim 25, wherein the assistance information is in a TA report or in another report.27.The method of claim 25, further comprising minimizing, by the network node, uplink-downlink collision within a TA accuracy duration via scheduling, configuring and setting a guard interval for uplink and downlink communications between the wireless communication device and the network node.28.The method of claim 25, further comprising performing, by the network node, at least one of:identifying time-domain resource on which collision occurs or may occur;identifying the uplink-downlink configuration, scheduling, or format or scheduling offset to minimize uplink-downlink collision or overlap between uplink and downlink resources, based on the reported assistance information;configuring the uplink-downlink configuration, scheduling, or format or the scheduling offset;configuring the uplink-downlink configuration, scheduling, or format or the scheduling offset based on a reported uplink-downlink configuration, scheduling, or format or reported scheduling offset received from the wireless communication device;sending to the wireless communication device acknowledgement to apply the reported uplink-downlink configuration, scheduling, or format or the reported scheduling offset received from wireless communication device;using the reported uplink-downlink configuration, scheduling, or format or the reported scheduling offset received from wireless communication device without sending the acknowledgement or indication;indicating to the wireless communication device an index or identifier of a candidate uplink-downlink configuration, scheduling, or format or scheduling offset.29.The method of claim 25, wherein further comprising performing, by the network node, at least one of:configuring at least one of an offset or periodicity of a semi-persistent transmission; orconfiguring at least one of a monitoring occasion or a resource for a downlink channel configured by a higher layer parameter.30.A wireless communication 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 the method recited in claim 25.31.A computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by at least one processor, causing the at least one processor to implement the method recited in claim 25.
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