Store and forward mode transition
The described methods and apparatuses address the challenge of S&F mode transitions in NTN by determining optimal transition times for UE operations, enhancing the efficiency and reliability of satellite-based services through adaptive measurement and mobility procedures.
Patent Information
- Application Number
- PCT/CN2025/085490
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-05
AI Technical Summary
Existing wireless communication systems face challenges in managing store and forward (S&F) mode transitions in non-terrestrial networks (NTN), particularly in determining optimal transition times for mobility and measurement procedures, which affect the efficiency and reliability of satellite-based services.
Implement methods and apparatuses to determine S&F mode transition times based on specific time indications, allowing UEs to perform measurement, mobility, and system information acquisition procedures efficiently, adapting to S&F mode transitions by skipping or resuming measurements and mobility processes as needed.
Enhances the efficiency and reliability of S&F mode transitions in NTN by optimizing UE operations, ensuring timely and appropriate handling of satellite-based services, thereby improving service continuity and reducing unnecessary resource consumption.
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Figure CN2025085490_05022026_PF_FP_ABST
Abstract
Description
STORE AND FORWARD MODE TRANSITION
[0001] The present disclosure relates to wireless communications, and more specifically to store and forward (S&F) mode transition.BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
[0003] Non-terrestrial network (NTN) refers to a network, or segment of networks using radio frequency (RF) resources on board a satellite or a high altitude platform station (HAPS) , providing 4G / 5G access using long term evolution (LTE) / new radio (NR) protocols. The satellite in the NTN can be a geostationary earth orbiting (GEO ) satellite with fixed location to the earth, or a low earth orbiting (LEO) satellite orbiting around the earth, or a HAPS including unmanned aerial vehicle (UAV) or balloon. 3GPP Rel-17 specifications have provided basic support of NTN features and in Rel-18 further enhancements are being studied. For Rel-19 NTN enhancements, it is proposed to support store and forward (S&F) satellite operations in NTN for delay-tolerant, non-real-time services to be offered in areas visited by the satellites. There are some issues for the S&F satellite operation to be addressed.SUMMARY
[0004] The present disclosure relates to methods, apparatuses, and systems that support store and forward (S&F) mode transition.
[0005] Some implementations of the method and apparatuses described herein include, determining, based on at least one time indication from a first base station, at least one store and forward (S&F) mode transition time of a cell, and based on the at least one determined S&F mode transition time of the cell, performing at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an access stratum (AS) -non-access stratum (NAS) interaction procedure.
[0006] Some implementations of the method and apparatuses described herein may further include determining the at least one S&F mode transition time based on the at least one time indication by at least one of the following: determining stop serving time of the cell indicated by the first indication as the first transition time in the case that a S&F operation indication of the cell is present, determining the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the second indication, determining the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the third indication, determining time indicated by a fourth indication as the first transition time based on receiving the fourth indication, determining the stop serving time of the cell indicated by the first indication as the second transition time in the case that a previously presented S&F operation indication of the cell is absent, determining the stop serving time of the cell as the second transition time based on receiving the fifth indication, determining the stop serving time of the cell as the second transition time based on receiving the third indication, or determining time indicated by the sixth indication as the second transition time based on receiving the sixth indication.
[0007] The UE does not support the S&F mode or prefers the normal mode than the S&F mode, some implementations of the method and apparatuses described herein may further include performing the measurement procedure based on the at least one determined S&F mode transition time by at least one of the following: skipping triggering a neighbour cell measurement before or upon the first transition time of a serving cell in a radio resource control (RRC) idle state or an RRC inactive state, triggering a neighbour cell measurement before or upon the second transition time of the serving cell in an RRC idle state or an RRC inactive state, suspending, stopping or ignoring at least one cell measurement on at least one measurement object associated with the normal mode until the first transition time of the cell in an RRC connected state, or resuming, starting or restarting at least one cell measurement on at least one measurement object associated with the normal mode upon or after the first transition time of the cell in an RRC connected state.
[0008] The UE supports the S&F mode or prefers the S&F mode than the normal mode, some implementations of the method and apparatuses described herein may further include performing the measurement procedure based on the at least one determined S&F mode transition time by at least one of the following: skipping triggering a neighbour cell measurement before or upon the second transition time of a serving cell in an RRC state or an RRC inactive state, triggering a neighbour cell measurement before or upon the first transition time of the serving cell in an RRC idle state or an RRC inactive state, suspending, stopping or ignoring at least one cell measurement on at least one measurement object associated with the S&F mode until the second transition time of the cell in an RRC connected state, or resuming, starting or restarting at least one cell measurement on at least one measurement object associated with the S&F mode upon or after the second transition time of the cell in an RRC connected state.
[0009] The UE does not support the S&F mode or prefers the normal mode than the S&F mode, some implementations of the method and apparatuses described herein may further include performing the mobility procedure based on the at least one determined S&F mode transition time by at least one of the following: precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the second transition time of the neighbour cell, precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell has not approached the first transition time of the neighbour cell, including or prioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached its first transition time, triggering a measurement report before or upon the second transition time of the serving cell in an RRC connected state, indicating the preference for the normal mode in the triggered measurement report, suspending, stopping or ignoring measurement report triggering associated with a cell operating in the normal mode until the first transition time of the cell in an RRC connected state, precluding content associated with a cell operating in the normal mode from the measurement report until the first transition time of the cell in an RRC connected state, resuming or applying measurement report triggering associated with a cell operating in the normal mode upon or after the first transition time of the cell in an RRC connected state, including content associated with a cell operating in the normal mode in the measurement report upon or after the first transition time of the cell in an RRC connected state, triggering a radio link failure (RLF) and a re-establishment or a cell reselection before or upon the second transition time of the serving cell in an RRC connected state, triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state, skipping triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state, suspending, stopping or ignoring a conditional handover (CHO) evaluation for a neighbour cell in the case that the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state, or resuming, starting or restarting a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state.
[0010] The UE supports the S&F mode or prefers the S&F mode than the normal mode, some implementations of the method and apparatuses described herein may further include performing the mobility procedure based on the at least one determined S&F mode transition time by at least one of the following: precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the first transition time of the neighbour cell, precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell has not approached the second transition time of the neighbour cell, including or prioritizing a neighbour cell for a cell reselection including cell ranking in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the second transition time of the neighbour cell, triggering a measurement report before or upon the first transition time of the serving cell in an RRC connected state, indicating the preference for the S&F mode in the triggered measurement report, suspending, stopping or ignoring measurement report triggering associated with a cell operating in the S&F mode until the second transition time of the cell in an RRC connected state, precluding content associated with a cell operating in the S&F mode from the measurement report until the second transition time of the cell in an RRC connected state, resuming or applying measurement report triggering associated with a cell operating in the S&F mode upon or after the second transition time of the cell in an RRC connected state, including content associated with a cell operating in the S&F mode in the measurement report upon or after the second transition time of the cell in an RRC connected state, triggering an RLF and a re-establishment or a cell reselection before or upon the first transition time of the serving cell in an RRC connected state, triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state, skipping triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state, suspending, stopping or ignoring a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state, or resuming, starting or restarting a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state.
[0011] Some implementations of the method and apparatuses described herein may further include performing the SI acquiring procedure based on the at least one determined S&F mode transition time by at least one of the following: triggering a system information block (SIB) acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC idle state or an RRC inactive state, triggering a SIB acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC connected state in the case that at least one of the first transition time or the second transition time is before an ephemeris expiry, starting a timer for the SIB acquiring procedure upon triggering the SIB acquiring procedure, stopping a triggered SIB acquiring procedure in an RRC connected state in the case that the second transition time of the serving cell is before the expiry of a timer for the SIB acquiring procedure and the UE does not support the S&F mode or prefers the normal mode than the S&F mode, or stopping a triggered SIB acquiring procedure in an RRC connected state in the case that the first transition time of the serving cell is before the expiry of the timer for the SIB acquiring procedure and the UE supports the S&F mode or prefers the S&F mode than the normal mode.
[0012] Some implementations of the method and apparatuses described herein may further include performing the AS-NAS interaction procedure based on the at least one determined S&F mode transition time by: indicating the at least one determined S&F mode transition time of the serving cell by a AS of the UE to a NAS of the UE.
[0013] Some implementations of the method and apparatuses described herein may further include performing the AS-NAS interaction procedure based on the at least one determined S&F mode transition time by at least one of the following: indicating, by the NAS of the UE, the AS of the UE to stop or suspend a transmission, a reception or paging monitoring for a normal service before the first transition time of the serving cell or after the second transition time of the serving cell, indicating, by the NAS of the UE, the AS of the UE to start or resume a transmission, a reception or paging monitoring for a normal service after the first transition time of the serving cell or before the second transition time of the serving cell, indicating, by the NAS of the UE, the AS of the UE to stop or suspend a transmission, a reception or paging monitoring for an S&F service before the second transition time of the serving cell or after the first transition time of the serving cell, or indicating, by the NAS of the UE, the AS of the UE to start or resume a transmission, a reception or paging monitoring for a normal service after the second transition time of the serving cell or before the first transition time of the serving cell.
[0014] In some implementations of the method and apparatuses described herein, the S&F mode transition time may comprise one of: a first transition time from a S&F mode to a normal mode, or a second transition time from the normal mode to the S&F mode, the at least one time indication may comprise at least one of: a first indication indicating stop serving time of the cell, a second indication indicating that the stop serving time is used as the first transition time, a third indication indicating that the cell supports the S&F mode, a fourth indication indicating the first transition time, a fifth indication indicating that the stop serving time is used as the second transition time, or a sixth indication indicating the second transition time, a S&F operation indication of the cell, or the cell may comprise one of a serving cell provided by the first base station or a neighbour cell provided by a second base station.
[0015] Some implementations of the method and apparatuses described herein include, receiving, from a second base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station, and determining at least one of a measurement configuration or a mobility configuration based on the at least one S&F mode transition time of the cell.
[0016] Some implementations of the method and apparatuses described herein may further include receiving the at least one S&F mode transition time by at least one of the following: receiving a first indication indicating stop serving time of the cell and a S&F operation indication of the cell, receiving a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time, receiving a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time, receiving a fourth indication indicating the first transition time, or receiving a sixth indication indicating the second transition time.
[0017] Some implementations of the method and apparatuses described herein may further include transmitting, to the second base station, a request for the at least one S&F mode transition time of the cell.
[0018] Some implementations of the method and apparatuses described herein may further include receiving, from the second base station, a request for the at least one S&F mode transition time of a cell provided by the first base station, and transmitting, to the second base station, at least one S&F mode transition time of the cell provided by the first base station.
[0019] Some implementations of the method and apparatuses described herein may further include determining the configuration of the measurement object based on the at least one S&F mode transition time of the cell by at least one of the following: determining at least one measurement object associated with the normal mode for at least one cell measurement based on the at least one S&F mode transition time, or determining at least one measurement object associated with the S&F mode for at least one cell measurement based on the at least one S&F mode transition time.
[0020] Some implementations of the method and apparatuses described herein may further include determining the configuration of the measurement report based on the at least one S&F mode transition time of the cell by at least one of the following: determining a triggering condition of a measurement report associated with the second transition time of a cell provided by the first base station based on the at least one S&F mode transition time, determining a triggering condition of a measurement report associated with the first transition time of the cell provided by the first base station based on the at least one S&F mode transition time, or determining content of a measurement report including a user equipment (UE) preference for the normal mode or the S&F mode based on the at least one S&F mode transition time.
[0021] Some implementations of the method and apparatuses described herein may further include determining the configuration of the CHO based on the at least one S&F mode transition time of the cell by at least one of the following: determining a CHO condition for a neighbour cell associated with the second transition time of the neighbour cell, or determining a CHO condition for a neighbour cell associated with the first transition time of the neighbour cell.
[0022] Some implementations of the method and apparatuses described herein may further include performing a mobility procedure based on the at least one S&F mode transition time.
[0023] Some implementations of the method and apparatuses described herein may further include performing the mobility procedure based on the at least one S&F mode transition time by at least one of the following: determining whether to forward data of S&F service to the second base station or to keep the data to be delivered to core network when connected to the core network, or generating a seventh indication indicating at least one of the forwarded data is for S&F service, or the forwarded data is the last data not delivered to the core network.
[0024] Some implementations of the method and apparatuses described herein may further include performing the mobility procedure based on the at least one S&F mode transition time by at least one of the following: determining a status of a serial number (SN) to be transferred to the second base station based on whether the S&F service data is forwarded to the second base station or is kept to be delivered to a core network, or generating an eighth indication indicating whether the SN is for the last service data unit SDU delivered to the core network.
[0025] Some implementations of the method and apparatuses described herein may further include transmitting, to the UE, at least one time indication for one or more S&F mode transition time, wherein the one or more S&F mode transition time comprises at least one of: at least one of S&F mode transition time of the cell, or at least one of S&F mode transition time of the cell at least one of S&F mode transition time of a cell provided by the first base station.
[0026] In some implementations of the method and apparatuses described herein, at least one of the following: the measurement configuration may comprise at least one of a configuration of a measurement object or a configuration of a measurement report, or the mobility configuration may comprise at least one of: a configuration of a conditional handover (CHO) , or a configuration of data forward.
[0027] In some implementations of the method and apparatuses described herein, the S&F mode transition time may comprise one of a first transition time from a S&F mode to a normal mode or a second transition time from the normal mode to the S&F mode.
[0028] Some implementations of the method and apparatuses described herein include, transmitting, to a first base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station.
[0029] Some implementations of the method and apparatuses described herein may further include transmitting the at least one S&F mode transition time by at least one of the following: transmitting a first indication indicating stop serving time of the cell and a S&F operation indication of the cell, transmitting a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time, transmitting a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time, transmitting a fourth indication indicating the first transition time, or transmitting a sixth indication indicating the second transition time.
[0030] Some implementations of the method and apparatuses described herein may further include receiving, from the first base station, a request for the at least one S&F mode transition time of the cell.
[0031] Some implementations of the method and apparatuses described herein may further include transmitting, to the first base station, a request for the at least one S&F mode transition time of a cell provided by the first base station, and receiving, from the first base station, at least one S&F mode transition time of the cell provided by the first base station.
[0032] In some implementations of the method and apparatuses described herein, the S&F mode transition time may comprise one of a first transition time from a S&F mode to a normal mode or a second transition time from a normal mode to a S&F mode.BRIEF DESCRIPTION OF THE DRAWINGS
[0033] FIG. 1 illustrates an example of a wireless communications system that supports S&F mode transition in accordance with aspects of the present disclosure.
[0034] FIG. 2 illustrates an example signaling chart illustrating an example process in accordance with aspects of the present disclosure.
[0035] FIG. 3 illustrates an example procedure in accordance with aspects of the present disclosure.
[0036] FIG. 4 illustrate illustrates an example of a device that support S&F mode transition in accordance with aspects of the present disclosure.
[0037] FIG. 5 illustrates an example of a processor that support S&F mode transition in accordance with aspects of the present disclosure.
[0038] FIG. 6 illustrates a flowchart of a method that supports S&F mode transition in accordance with aspects of the present disclosure.
[0039] FIG. 7 illustrates a flowchart of a method that supports S&F mode transition in accordance with aspects of the present disclosure.
[0040] FIG. 8 illustrates a flowchart of a method that supports S&F mode transition in accordance with aspects of the present disclosure.
[0041] Throughout the drawings, the same or similar reference numerals represent the same or similar elements.DETAILED DESCRIPTION
[0042] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein may be implemented in various manners other than the ones described below.
[0043] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0044] References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0045] It shall be understood that although the terms “first” and “second” or the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0046] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0047] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as, 5G new radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) , and so on. Further, the communications between a user equipment and a network device in the communication network may be performed according to any suitable generation communication protocols, including but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will also be future type communication technologies and systems in which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned systems.
[0048] As used herein, the term “network device” generally refers to a node in a communication network via which a user equipment can access the communication network and receive services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , a radio access network (RAN) node, an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , an infrastructure device for a V2X (vehicle-to-everything) communication, a transmission and reception point (TRP) , a reception point (RP) , a remote radio head (RRH) , a relay, an integrated access and backhaul (IAB) node, a low power node such as a femto BS, a pico BS, and so forth, depending on the applied terminology and technology. The network device may further refer to a network function (NF) in the core network, for example, a SMF, an AMF, a PCF, a UPF or devices with same function in future network architectures, and so forth.
[0049] As used herein, the term “user equipment (UE) ” generally refers to any end device that may be capable of wireless communications. By way of example rather than a limitation, a user equipment may also be referred to as a communication device, a terminal device, an end user device, a subscriber station (SS) , an unmanned aerial vehicle (UAV) , a portable subscriber station, a mobile station (MS) , or an access terminal (AT) . The user equipment may include, but is not limited to, a mobile phone, a cellular phone, a smart phone, a voice over IP (VoIP) phone, a wireless local loop phone, a tablet, a wearable user equipment, a personal digital assistant (PDA) , a portable computer, a desktop computer, an image capture user equipment such as a digital camera, a gaming user equipment, a music storage and playback appliance, a vehicle-mounted wireless user equipment, a wireless endpoint, a mobile station, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , a USB dongle, a smart device, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device (for example, a remote surgery device) , an industrial device (for example, a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. In the following description, the terms: “user equipment, ” “communication device, ” “terminal, ” “user equipment” and “UE, ” may be used interchangeably.
[0050] As used herein, the term “NTN” refers to a network, or segment of networks using RF resources on board a satellite or a HAPS, providing 4G / 5G access using LTE / NR protocols. The satellite in the NTN can be a GEO satellite with fixed location to the earth, or a LEO satellite orbiting around the earth, or a HAPS including UAV or balloon.
[0051] FIG. 1 illustrates an example of a wireless communications system 100 that supports store and forward operations in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) ) , one or more UEs 104, a core network 106, and a packet data network 108. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0052] The one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. A network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
[0053] A network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112. For example, a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102. Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0054] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In some other implementations, a UE 104 may be mobile in the wireless communications system 100.
[0055] The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in FIG. 1. A UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in FIG. 1. Additionally, or alternatively, a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
[0056] A UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0057] A network entity 102 may support communications with the core network 106, or with another network entity 102, or both. For example, a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) . In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102) . In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) . In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) . In an example, the network entity 102 may be the satellite, there may be full or part of a eNB / gNB on board. A communication link 110 between the satellite 102 and the UE 104, a communication link 110 between the satellite 102 and a BS 102, and a communication link 116 between the BS 102 and core network 106 may be used for the NTN transparent mode. A communication link 110 between the satellite 102 and the UE 104, and a communication link 116 between the satellite 102 (with BS on board) and core network 106 may be used for the NTN regenerative mode.
[0058] In some implementations, a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.
[0059] An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0060] Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160.
[0061] Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
[0062] A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.
[0063] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
[0064] The core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102. The core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
[0065] In the wireless communications system 100, the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the network entities 102 and the UEs 104 may support different resource structures. For example, the network entities 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the network entities 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0066] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0067] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0068] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0069] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0070] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0071] Both Rel-17 and Rel-18 NTN assume immediate data delivery (from a source UE to a target UE) without a time duration of storing the data in network. For Rel-19 NTN enhancements, satellite operators and vendors are proposing to support store and forward (S&F) satellite operations in NTN for delay-tolerant, non-real-time services to be offered in areas visited by the satellites but with no need to have NTN gateway infrastructure (e.g. mid-sea, remote areas) , and are considering it as a key to facilitate cost-effective deployment of NTN services with sparse satellite constellations and reduced ground segment infrastructure.
[0072] Support of S&F operation is currently one of the objectives for Rel-19 IoT NTN. Support of Store &Forward (S&F) satellite operation with full eNB as regenerative payload, therefore:
[0073] Define the necessary enhancements into E-UTRAN (network &UE) to support S&F operation for delay-tolerant services [RAN3, RAN2]
[0074] Specify necessary enhancements for full eNB as regenerative payload e.g. related to S1 protocol, especially to address the feeder link switch over as needed [RAN3]
[0075] Note: Strive to minimize UE impact.
[0076] Note: Coordination with SA2 (Rel-19 SA2 led Sat-Arch ph3 SI) is needed on the detail requirements (e.g. traffic type, or QoS parameters for S&F) , network architecture (e.g. whether consider (partial) core network on satellite) etc.; further coordination with CT1 might be required.
[0077] An “S&F operation” indication is introduced, which indicates operation status (when presented) and barring status. If the value of the “S&F operation” indication is 1, it allows S&F-capable UE in RRC_IDLE state to access and if the value of the “S&F operation” indication is 0, it bars S&F-capable UE in RRC_IDLE state from accessing.
[0078] Indication of “S&F to normal” mode transition time is supported in system information block (SIB) 31 (SIB31) using absolute UTC time format, and whether to reuse t-Service to indicate it or introduce a new indication is for further studied. The t-Service indicates the time information on when a cell provided via the NTN is going to stop serving the area it is currently covering. Indication of “normal to S&F” mode transition time is still under discussion.
[0079] Based on all possible conditions of introducing the above indications, i.e., dedicated “S&F operation” indication in SIB1, “S&F to normal” mode transition time in SIB31 (by a dedicated indication or reusing t-Service) , and “normal to S&F” mode transition time (by a dedicated indication or reusing t-Service) , there are potential impact on mobility management and related procedures, e.g., issues of mobility and service management for store and forward operations in NTN.
[0080] In the first issue, there is impact of mode transition time on cell reselection. In Rel-17 and Rel-18 IoT-NTN, UE is required to trigger neighbour cell measurement for cell reselection before t-Service if indicated. This field applies for both service link switches in NTN quasi-Earth fixed cell and feeder link switches for both NTN quasi-Earth fixed and Earth-moving cell.
[0081] Based on the current 3GPP discussions for Rel-19 IoT NTN, there is possibility that t-Service will also be used to indicate the “S&F to normal” mode transition time or “normal to S&F” mode transition time. In case t-Service is used for multiple purposes, the triggering of neighbour cell measurement may be differentiated for different purposes.
[0082] If t-Service is used to indicate the “S&F to normal” mode transition time, considering that it is just the stop serving time of a service mode (mode change) instead of the stop serving time of the cell (cell change) , it is unnecessary to trigger neighbour cell measurement as the cell is still available. In case that some S&F service cannot supported in normal mode, the S&F-capable UEs trigger neighbour cell measurement before t-Service.
[0083] If t-Service is used to indicate the “normal to S&F” mode transition time, similarly it is unnecessary to trigger neighbour cell measurement as the cell is still available for the S&F-capable UEs. For the S&F-incapable UEs, it would be necessary to trigger neighbour cell measurement before t-Service, as normal service is expected not to be supported in S&F mode.
[0084] In the case that t-Service is not reused for any mode transition time indication) , if “S&F to normal” mode transition time does not reuse t-Service, the neighbour cell measurement triggering regarding t-Service remains unchanged, and in the case that some S&F service cannot supported in normal mode, the S&F-capable UEs trigger neighbour cell measurement before the “S&F to normal” mode transition time. If “normal to S&F” mode transition time is introduced and does not reuse t-Service, the neighbour cell measurement triggering regarding t-Service remains unchanged, and the S&F-incapable UEs trigger neighbour cell measurement before the “normal to S&F” mode transition time.
[0085] Additionally, if the mode transition time of neighbour cells can be provided to the UE as well, the UE can further consider the cell operating mode when performing cell reselection. For example, the UE may preclude or de-prioritize some cells in a mode not supported or not preferred during cell ranking.
[0086] In the second issue, there is impact of mode transition time on CONNECTED mobility, including measurements, the measurement reporting (for eMTC) , the handover HO and conditional handover (CHO) (for eMTC) , the radio link failure (RLF) triggering (for NB-IoT) and the satellite switch with re-synchronization.
[0087] The eNB may configure the UE in RRC_CONNECTED state with measurement objects (e.g., frequency / time location and subcarrier spacing of reference signals to be measured) to perform measurements. If mode transition time is indicated, it is possible that some measurement objects will be unnecessary to be measured, e.g., an S&F-incapable UE does not need to perform a measurement on the object of the serving cell or a neighbour cell that will transit to S&F mode. In such cases, some measurements can be suspended or even stopped based on the mode transition time and the corresponding UE capability.
[0088] For eMTC, the eNB may trigger the UE for the measurement reporting considering the mode transition time. Optionally, a time-based measurement report triggering at the UE may also be considered with knowledge of the mode transition time.
[0089] For eMTC, if the mode transition time of neighbour cells may be provided to the serving eNB, the eNB can further consider the cell operating mode for the HO decision. for example, precluding or de-prioritizing some cells in a mode not supported or not preferred.
[0090] When performing the serial number (SN) status transfer to target eNB during HO, the serving eNB operating in S&F mode may need to decide the SN status based on whether the corresponding data has been delivered to the mobility management entity (MME) . When performing data forwarding to the target eNB during the HO, the source eNB operating in S&F mode may need to decide whether to forward the stored data based on whether the corresponding data has been delivered to MME.
[0091] For eMTC, if the mode transition time of neighbour cells can be provided to the UE, the UE can further consider the cell operating mode for the CHO evaluation or execution, for example, precluding or de-prioritizing some cells in a mode not supported or not preferred.
[0092] For NB-IoT, the CONNECTED mobility is based on the RLF triggering and the reselection. Upon transition from the normal mode to S&F mode, there is no expected signal strength or quality change to trigger the RLF for the mobility.
[0093] Upon the transition from the S&F mode to the normal mode, in case that some S&F service cannot be supported in the normal mode, the S&F-capable UEs may trigger the RLF before or upon the “S&F to normal” mode transition time (dedicated or reusing t-Service) to reselect to another cell in the S&F mode. The S&F-incapable UEs may trigger the RLF before or upon the “normal to S&F” mode transition time (dedicated or reusing t-Service) to reselect to another cell in normal mode.
[0094] In the satellite switch with re-synchronization scenario supported in NTN, a UE capable of hard satellite switch with resynchronization in RRC_CONNECTED state initiates the procedure when SatSwitchWithReSync and t-Service are included in SIB19. Upon initiating the procedure, and upon the time indicated by t-Service, the UE may: stop timer T430 if running; inform lower layers that UL synchronization is lost due to satellite switch with resynchronization; synchronize to the DL of the SpCell served by the satellite indicated by ntn-Config in SatSwitchWithReSync, if the UE has not previously synchronized to the DL of the SpCell; start timer T430 with the timer value set to ntn-UlSyncValidityDuration from the subframe indicated by epochTime in ntn-Config in SatSwitchWithReSync; inform lower layers when UL synchronisation is obtained.
[0095] If t-Service is used to indicate the “S&F to normal” mode transition time, considering that it is the stop serving time of a service mode (mode change) instead of the stop serving time of the cell (cell change) , it is unnecessary to trigger the satellite switch with re-synchronization as the cell is still available. In the case that some S&F service cannot supported in normal mode, the S&F-capable UEs trigger the satellite switch with re-synchronization upon t-Service.
[0096] If t-Service is used to indicate the “normal to S&F” mode transition time, similarly it is unnecessary to trigger the satellite switch with re-synchronization as the cell is still available for the S&F-capable UEs. For the S&F-incapable UEs, it would be necessary to trigger the satellite switch with re-synchronization upon t-Service, as normal service is expected not to be supported in the S&F mode.
[0097] If “S&F to normal” mode transition time does not reuse t-Service, the satellite switch with re-synchronization upon t-Service remains unchanged, and in case that some S&F service cannot supported in normal mode, the S&F-capable UEs trigger satellite switch with re-synchronization upon the “S&F to normal” mode transition time.
[0098] If “normal to S&F” mode transition time is introduced and does not reuse t-Service, the satellite switch with re-synchronization upon t-Service remains unchanged, and the S&F-incapable UEs trigger satellite switch with re-synchronization upon the “normal to S&F” mode transition time.
[0099] In the third issue, there is impact of mode transition time on the ephemeris (SIB31) acquiring and the UL synchronization. In Rel-17 and Rel-18 IoT-NTN, the UE in RRC_IDLE state is required to acquire the ephemeris in SIB31 before its expiration.
[0100] If mode transition time is indicated in SIB31, the UE may need to re-acquire the SIB31 for the new transition time update, e.g., upon “S&F to normal” mode transition time, re-acquire SIB31 for the “normal to S&F” transition time, or vice versa..
[0101] In Rel-17 and Rel-18 IoT-NTN, the UE in RRC_CONNECTED state is required to acquire the ephemeris in SIB31 upon T317 expiration (and T318 starts) , and to complete it before T318 expiration.
[0102] If the mode transition time is indicated in SIB31 before T317 expiration, the UE may need to re-acquire the SIB31 for the new transition time update, e.g., upon “S&F to normal” mode transition time, re-acquire SIB31 for the “normal to S&F” transition time, or vice versa. If the mode transition time is indicated in SIB31 after T317 expiration and before T318 expiration, the UE may need to terminate unnecessary SIB31 re-acquiring if the cell is to transit to a mode not supported or preferred.
[0103] In the fourth issue, there is impact of the mode transition time on the UE service handling, including UL service initiation suspending and resuming, DL service paging monitoring, and corresponding UE AS-NAS interaction.
[0104] From service perspective, the mode transition time provides the following information. The “S&F to normal” mode transition time (dedicated or reusing t-Service) indicates: when the normal UL service initiation or the normal DL service paging can be resumed; or when S&F UL service initiation or S&F DL service paging can be suspended. The “normal to S&F” mode transition time (dedicated or reusing t-Service) indicates: when S&F UL service initiation or S&F DL service paging can be resumed; or when normal UL service initiation or normal DL service paging can be suspended. Such information obtained via the AS signalling may be provided to UE NAS for service control.
[0105] In view of the above discussions, some embodiments of the present disclosure provide a solution for the store and forward mode transition. In one aspect of the solution of the present disclosure, a user equipment determines at least one store and forward mode transition time of a cell based on at least one time indication from a first base station. Based on the at least one determined S&F mode transition time of the cell, the user equipment performs at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an AS-NAS interaction procedure. In this way, the measurement procedure, the mobility procedure, the SI acquiring procedure, and the AS-NAS interaction procedure are enhanced. Therefore, the performance of communication is improved. Principles and implementations of embodiments of the present disclosure will be described in detail below with reference to FIGS. 2-8.
[0106] FIG. 2 illustrates a signaling chart illustrating an example process 200 in accordance with aspects of the present disclosure. The process 200 may involve a UE 201, a first base station 202 and a second base station 203. The UE 201 in FIG. 2 may be an example of UE 104 in FIG. 1. The first base station 202 in FIG. 2 may be an example of a network entity 102 in FIG. 1. The second base station 203 in FIG. 2 may be an example of a network entity 102 in FIG. 1. It would be appreciated that although the process 200 is applied to in the communication environment 100 of FIG. 1, this process may be likewise applied to other communication scenarios with similar issues.
[0107] In the process 200, the second base station 203 transmits 210 at least one S&F mode transition time of a cell 215 to the first base station 202. The cell is provided by the second base station 203. On the other side of the communication, the first base station 202 receives 220 the at least one S&F mode transition time of a cell 215 from the second base station 203.
[0108] In some embodiments, the S&F mode transition time may comprise a first transition time from a S&F mode to a normal mode, or a second transition time from the normal mode to the S&F mode.
[0109] For receiving the at least one S&F mode transition time, In the first example, the second base station 203 may transmit a first indication indicating stop serving time of the cell (e.g., t-Service) and a S&F operation indication of the cell. The first base station 202 may receive the first indication indicating stop serving time of the cell and the S&F operation indication of the cell.
[0110] In the second example, the second base station 203 may transmit a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time. The first base station 202 may receive a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time.
[0111] In the third example, the second base station 203 may transmit a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time. The first base station 202 may receive a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time.
[0112] In the fourth example, the second base station 203 may transmit a fourth indication indicating the first transition time. The first base station 202 may receive a fourth indication indicating the first transition time.
[0113] In the fifth example, the second base station 203 may transmit a sixth indication indicating the second transition time. The first base station 202 may receive a sixth indication indicating the second transition time.
[0114] For instance, a first eNB / gNB (i.e., the first base station 202) may receive at least one S&F mode transition time of a cell belonging to the first eNB / gNB to the second eNB / gNB (i.e., the second base station 203) , and the at least one S&F mode transition time of a cell is indicated by: a stop serving time (t-Service) and an S&F operation indication of the cell, a stop serving time (t-Service) and an explicit indication of the cell indicating that the stop serving time is used as the S&F to normal mode transition time or as the normal to S&F mode transition time, a first explicit indication as the S&F to normal mode transition time of the cell, or a second explicit indication as the normal to S&F mode transition time of the cell.
[0115] In some embodiments, the first base station 202 may transmit a request for the at least one S&F mode transition time of the cell to the second base station 203. Correspondingly, the second base station 203 may receive the request for the at least one S&F mode transition time of the cell from the first base station 202.
[0116] For example, the first eNB / gNB may transmit a request for at least one S&F mode transition time of a cell belonging to the first eNB / gNB to the second eNB / gNB.
[0117] Alternatively or additionally, the first base station 202 may further receive a request for the at least one S&F mode transition time of a cell from the second base station 203. The cell is provided by the first base station. The first base station 202 then may transmit at least one S&F mode transition time of the cell provided by the first base station 202 to the second base station 203.
[0118] On the other side of the communication, the second base station 203 may transmit, a request for the at least one S&F mode transition time of a cell provided by the first base station 202 to the first base station 202. The second base station 203 may then receive at least one S&F mode transition time of the cell provided by the first base station 202 from the first base station 202.
[0119] Continuing with reference to FIG. 2, based on the at least one S&F mode transition time of the cell, the second base station 203 determines 225 at least one of a measurement configuration or a mobility configuration. For example, the first eNB / gNB may receive at least one S&F mode transition time of a cell from the second eNB / gNB, and determine the measurement configuration or the mobility configuration based on the at least one mode transition time of a cell.
[0120] In some embodiments, the measurement configuration may comprise a configuration of a measurement object, a configuration of a measurement report, or a combination of two items. In addition, the mobility configuration may comprise a configuration of a CHO, or a configuration of data forward, or a combination of two items.
[0121] The configuration of a measurement object may indicate whether to measure on a measurement object associated to a mode or mode transition time. The configuration of the measurement report may indicate whether to trigger a measurement report associated to a mode or mode transition time. The configuration of the CHO may indicate whether to evaluate the CHO or a new CHO condition associated to the mode or mode transition time. The configuration of data forward may indicate whether to forward data to the neighbour eNB / gNB or to the MME / 5GC and corresponding SN.
[0122] For determining the configuration of the measurement object, the first base station 202 may determine at least one measurement object associated with the normal mode for at least one cell measurement based on the at least one S&F mode transition time. For example, the first eNB / gNB may configure at least one measurement object associated to normal mode for the serving / neighbour cell measurement based on the at least one mode transition time.
[0123] Alternatively or additionally, the first base station 202 may determine at least one measurement object associated with the S&F mode for at least one cell measurement based on the at least one S&F mode transition time. For example, the first eNB / gNB may configure at least one measurement object associated to S&F mode for the serving / neighbour cell measurement based on the at least one mode transition time.
[0124] For determining the configuration of the measurement report, the first base station 202 may determine a triggering condition of a measurement report associated with the second transition time of a cell provided by the first base station based on the at least one S&F mode transition time. For example, the first eNB / gNB may configure measurement report triggering condition associated to the normal to S&F mode transition time of the serving cell based on the at least one mode transition time.
[0125] Alternatively or additionally, the first base station 202 may determine a triggering condition of a measurement report associated with the first transition time of the cell provided by the first base station based on the at least one S&F mode transition time. For example, the first eNB / gNB may configure at least one measurement report triggering condition associated to the S&F to normal mode transition time of the serving cell based on the at least one mode transition time.
[0126] Additionally, the first base station 202 may determine content of a measurement report including a UE preference for the normal mode or the S&F mode based on the at least one S&F mode transition time. For example, he first eNB / gNB may configure the measurement report content including the UE preference for the normal operation or the S&F operation based on the at least one mode transition time.
[0127] For determining the configuration of the CHO, the first base station 202 may determine a CHO condition for a neighbour cell associated with the second transition time of the neighbour cell. For example, he first eNB / gNB may configure a CHO condition for a neighbour cell associated to the normal to S&F mode transition time of the neighbour cell based on the at least one mode transition time.
[0128] Alternatively or additionally, the first base station 202 may determine a CHO condition for a neighbour cell associated with the first transition time of the neighbour cell. For example, he first eNB / gNB may configure a CHO condition for a neighbour cell associated to the S&F to normal mode transition time of the neighbour cell based on the at least one mode transition time.
[0129] In some embodiments, the first base station 202 may perform a mobility procedure based on the at least one S&F mode transition time.
[0130] Alternatively or additionally, in order to perform the mobility procedure, the first base station 202 may determine whether to forward data of S&F service to the second base station or to keep the data to be delivered to core network when connected to the core network. In addition, the first base station 202 may generate a seventh indication indicating at least one of the forwarded data is for S&F service, or the forwarded data is the last data not delivered to the core network.
[0131] In an example, the first eNB / gNB may decide to forward S&F service data to a neighbour eNB / gNB or to keep the user data to be delivered to core network when connected. Additionally, the first eNB / gNB may indicate that the forwarded data is for S&F service, or the forwarded data is the last data not delivered to the core network.
[0132] Additionally, in order to perform the mobility procedure, the first base station 202 may determine a status of a serial number (SN) to be transferred to the second base station based on whether the S&F service data is forwarded to the second base station or is kept to be delivered to a core network. Alternatively or additionally, the first base station 202 may generate an eighth indication indicating whether the SN is for the last service data unit SDU delivered to the core network.
[0133] In an example, the first eNB / gNB may decide he SN status to be transferred to a neighbour eNB based on whether the S&F service data is forwarded to the neighbour eNB / gNB or is kept to be delivered to the core network.
[0134] In some embodiments, the first base station 202 may further transmit 230 at least one time indication 235 for one or more S&F mode transition time to the UE 201. Correspondingly, the UE 201 may receive 240 the at least one time indication 235.
[0135] In some embodiments, the one or more S&F mode transition time may comprise at least one of S&F mode transition time of the cell, at least one of S&F mode transition time of the cell at least one of S&F mode transition time of a cell provided by the first base station, or a combination of above two items.
[0136] In addition, the at least one time indication 235 may comprise a first indication indicating stop serving time of the cell, a second indication indicating that the stop serving time is used as the first transition time, a third indication indicating that the cell supports the S&F mode, a fourth indication indicating the first transition time, a fifth indication indicating that the stop serving time is used as the second transition time, a sixth indication indicating the second transition time, a S&F operation indication of the cell, or any combination of two or more of the above-mentioned items.
[0137] Continuing with reference to FIG. 2, based on the at least one time indication 235 from the first base station 202, the UE 201 determines 245 at least one store and forward mode transition time of a cell.
[0138] For determining the at least one S&F mode transition time based on the at least one time indication, in the first example, the UE 201 may determine stop serving time of the cell indicated by the first indication as the first transition time if a S&F operation indication of the cell is present. For instance, the UE 201 may consider the time indicated by the stop serving time (t-Service) as the S&F to normal mode transition time of the cell, if an S&F operation indication of the cell is “present” .
[0139] In the second example, the UE 201 may determine the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the second indication. For instance, the UE 201 may consider the time indicated by the stop serving time (t-Service) as the S&F to normal mode transition time of the cell, if an explicit indication (i.e., the second indication) of the cell indicates that the stop serving time is used as the S&F to normal mode transition time.
[0140] In the third example, the UE 201 may determine the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the third indication. For instance, the UE 201 may consider the time indicated by the stop serving time (t-Service) as the S&F to normal mode transition time of the cell, if the UE AS receives an indication that the cell supports S&F operation (i.e., the third indication) from the AS signalling or from the NAS signalling and the NAS-AS interaction.
[0141] In the fourth example, the UE 201 may determine time indicated by a fourth indication as the first transition time based on receiving the fourth indication. For instance, the UE 201 may consider the time indicated by a first explicit indication (i.e., the fourth indication) as the S&F to normal mode transition time of the cell.
[0142] In the fifth example, the UE 201 may determine the stop serving time of the cell indicated by the first indication as the second transition time if a previously presented S&F operation indication of the cell is absent. For instance, the UE 201 may consider the time indicated by the stop serving time (t-Service) as the normal to S&F mode transition time of the cell, if a previously presented S&F operation indication of the cell is “absent” .
[0143] In the sixth example, the UE 201 may determine the stop serving time of the cell as the second transition time based on receiving the fifth indication. For instance, the UE 201 may consider the time indicated by the stop serving time (t-Service) as the normal to S&F mode transition time of the cell, if an explicit indication (i.e., the fifth indication) of the cell indicates that the stop serving time is used as the normal to S&F mode transition time.
[0144] In the seventh example, the UE 201 may determine the stop serving time of the cell as the second transition time based on receiving the third indication. For instance, the UE 201 may consider the time indicated by the stop serving time (t-Service) as the normal to S&F mode transition time of the cell, if the UE AS receives an indication that the cell supports the S&F operation from the AS signalling or from the NAS signalling and the NAS-AS interaction.
[0145] In the eight example, the UE 201 may determine time indicated by the sixth indication as the second transition time based on receiving the sixth indication. For instance, the UE 201 may consider the time indicated by a second explicit indication (i.e., the sixth indication) as the normal to S&F mode transition time of the cell.
[0146] Continuing with reference to FIG. 2, based on the at least one determined S&F mode transition time of the cell, the UE 201 performs 250 at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an AS-NAS interaction procedure.
[0147] In some embodiments, if the UE 201 does not support the S&F mode or prefers the normal mode than the S&F mode, for performing the measurement procedure based on the at least one determined S&F mode transition time, in the first example, the UE 201 may skip triggering a neighbour cell measurement before or upon the first transition time of a serving cell in a radio resource control (RRC) idle state or an RRC inactive state.
[0148] In the second example, the UE 201 may trigger a neighbour cell measurement before or upon the second transition time of the serving cell in an RRC idle state or an RRC inactive state.
[0149] In the third example, the UE 201 may suspend, stop or ignor at least one cell measurement on at least one measurement object associated with the normal mode until the first transition time of the cell in an RRC connected state. For instance, in RRC_CONNECTED state, the UE 201 may suspend, stop or ignore the serving / neighbour cell measurement on at least one measurement object associated to normal mode until the S&F to normal mode transition time of the serving / neighbour cell.
[0150] In the fourth example, the UE 201 may resume, start or restart at least one cell measurement on at least one measurement object associated with the normal mode upon or after the first transition time of the cell in an RRC connected state. For instance, in RRC_CONNECTED state, the UE 201 may resume, start or restart the serving / neighbour cell measurement on at least one measurement object associated to the normal mode upon or after the S&F to normal mode transition time of the serving / neighbour cell.
[0151] In some embodiments, if the UE 201 supports the S&F mode or prefers the S&F mode than the normal mode, for performing the measurement procedure based on the at least one determined S&F mode transition time, in the first example, the UE 201 may skip triggering a neighbour cell measurement before or upon the second transition time of a serving cell in an RRC state or an RRC inactive state.
[0152] In the second example, the UE 201 may trigger a neighbour cell measurement before or upon the first transition time of the serving cell in an RRC idle state or an RRC inactive state.
[0153] In the third example, the UE 201 may suspend, stop or ignore at least one cell measurement on at least one measurement object associated with the S&F mode until the second transition time of the cell in an RRC connected state. For instance, in RRC_CONNECTED state, the UE 201 may suspend, stop or ignore serving / neighbour cell measurement on at least one measurement object associated to S&F mode until the normal to S&F mode transition time of the serving / neighbour cell.
[0154] In the fourth example, the UE 201 may resume, start or restart at least one cell measurement on at least one measurement object associated with the S&F mode upon or after the second transition time of the cell in an RRC connected state. For instance, in RRC_CONNECTED state, the UE 201 may resume, start or restart the serving / neighbour cell measurement on at least one measurement object associated to S&F mode upon or after the normal to S&F mode transition time of the serving / neighbour cell.
[0155] In some embodiments, if the UE 201 does not support the S&F mode or prefers the normal mode than the S&F mode, for performing the mobility procedure based on the at least one determined S&F mode transition time, in the first example, the UE 201 may preclude or deprioritize a neighbour cell for a cell reselection (including cell ranking) in an RRC idle state or an RRC inactive state if the neighbour cell is approaching or has approached the second transition time of the neighbour cell.
[0156] In the second example, if the neighbour cell has not approached the first transition time of the neighbour cell, the UE 201 may preclude or deprioritize a neighbour cell for a cell reselection (including cell ranking) in an RRC idle state or an RRC inactive state.
[0157] In the third example, if the neighbour cell is approaching or has approached its first transition time, the UE 201 may include or prioritize a neighbour cell for a cell reselection (including cell ranking) in an RRC idle state or an RRC inactive state.
[0158] In the fourth example, the UE 201 may trigger a measurement report before or upon the second transition time of the serving cell in an RRC connected state. In the fifth example, the UE 201 may indicate the preference for the normal mode in the triggered measurement report.
[0159] For instance, in RRC_CONNECTED state, the UE 201 may trigger the measurement reporting before or upon the normal to S&F mode transition time of the serving cell. Optionally, the UE 201 may indicate its preference for the normal operation in the triggered measurement report.
[0160] In the sixth example, the UE 201 may suspend, stop or ignore measurement report triggering associated with a cell operating in the normal mode until the first transition time of the cell in an RRC connected state. For instance, in RRC_CONNECTED state, the UE 201 may suspend, stop or ignore the measurement report triggering associated to a serving / neighbour cell operating in the normal mode until the S&F to normal mode transition time of the serving / neighbour cell.
[0161] In the seventh example, the UE 201 may preclude content associated with a cell operating in the normal mode from the measurement report until the first transition time of the cell (a serving / neighbour cell) in an RRC connected state.
[0162] In the eighth example, the UE 201 may resume, or apply measurement report triggering associated with a cell (a serving / neighbour cell) operating in the normal mode upon or after the first transition time of the cell in an RRC connected state.
[0163] In the ninth example, the UE 201 may include content associated with a cell (a serving / neighbour cell) operating in the normal mode in the measurement report upon or after the first transition time of the cell in an RRC connected state.
[0164] In the tenth example, the UE 201 may trigger an RLF and a re-establishment or a cell reselection before or upon the second transition time of the serving cell in an RRC connected state.
[0165] In the eleventh example, the UE 201 may trigger a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state.
[0166] In the twelfth example, the UE 201 may skip triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state.
[0167] In the thirteenth example, if the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state, the UE 201 may suspend, stop or ignore a CHO evaluation for a neighbour cell.
[0168] In the fourteenth example, if the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state, the UE 201 may resume, start or restart a CHO evaluation for a neighbour cell.
[0169] In some embodiments, if the UE 201 supports the S&F mode or prefers the S&F mode than the normal mode, for performing the mobility procedure based on the at least one determined S&F mode transition time, in the first example, the UE 201 may preclude or deprioritize a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state if the neighbour cell is approaching or has approached the first transition time of the neighbour cell. For instance, in RRC_IDLE / INACTIVE state, the UE 201 may preclude or deprioritize a neighbour cell for cell reselection including cell ranking if the neighbour cell is approaching or has approached its S&F to normal mode transition time.
[0170] In the second example, if the neighbour cell has not approached the second transition time of the neighbour cell, the UE 201 may preclude or deprioritize a neighbour cell for a cell reselection (including cell ranking) in an RRC idle state or an RRC inactive state.
[0171] In the third example, if the neighbour cell is approaching or has approached its second transition time, the UE 201 may include or prioritize a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state.
[0172] In the fourth example, the UE 201 may trigger a measurement report before or upon the second transition time of the serving cell in an RRC connected state. In the fifth example, the UE 201 may indicate the preference for the normal mode in the triggered measurement report.
[0173] For instance, in RRC_CONNECTED state, the UE 201 may trigger the measurement reporting before or upon the S&F to normal mode transition time of the serving cell. Additionally, the UE 201 may indicate its preference for the S&F operation in the triggered measurement report.
[0174] In the sixth example, the UE 201 may suspend, stop or ignore measurement report triggering associated with a cell (serving / neighbour cell) operating in the S&F mode until the second transition time of the cell (serving / neighbour cell) in an RRC connected state.
[0175] In the seventh example, the UE 201 may preclude content associated with a cell (serving / neighbour cell) operating in the S&F mode from the measurement report until the second transition time of the cell in an RRC connected state.
[0176] In the eighth example, the UE 201 may resume, or apply measurement report triggering associated with a cell (serving / neighbour cell) operating in the S&F mode upon or after the second transition time of the cell in an RRC connected state.
[0177] In the ninth example, the UE 201 may include content associated with a cell operating in the S&F mode in the measurement report upon or after the second transition time of the cell in an RRC connected state.
[0178] In the tenth example, the UE 201 may trigger an RLF and a re-establishment or a cell reselection before or upon the first transition time of the serving cell in an RRC connected state. For instance, in RRC_CONNECTED, the UE 201 may trigger the RLF, considers RLF occurred, trigger re-establishment or cell reselection before or upon the S&F to normal mode transition time of the serving cell.
[0179] In the eleventh example, the UE 201 may trigger a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state.
[0180] In the twelfth example, the UE 201 may skip triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state.
[0181] In the thirteenth example, if the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state, the UE 201 may suspend, stop or ignore a CHO evaluation for a neighbour cell. For instance, in RRC_CONNECTED, the UE 201 may suspend, stop or ignore the CHO evaluation for a neighbour cell if the neighbour cell has approached its S&F to normal mode transition time.
[0182] In the fourteenth example, if the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state, the UE 201 may resume, start or restart a CHO evaluation for a neighbour cell.
[0183] Alternatively or additionally, for performing the SI acquiring procedure based on the at least one determined S&F mode transition time, in the first example, the UE 201 may trigger a system information block (SIB) acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC idle state or an RRC inactive state. For instance, in RRC_IDLE / INACTIVE state, the UE 201 may trigger a SIB (e.g., SIB19 for NR and SIB31 for LTE) acquiring before or upon the S&F to normal mode transition time of the serving cell or the normal to S&F mode transition time of the serving cell.
[0184] In the second example, if at least one of the first transition time or the second transition time is before an ephemeris expiry, the UE 201 may trigger a SIB acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC connected state. In the third example, the UE 201 may start a timer for the SIB acquiring procedure upon triggering the SIB acquiring procedure.
[0185] For instance, in RRC_CONNECTED, the UE 201 may trigger a SIB (e.g., SIB19 for NR and SIB31 for LTE) acquiring before or upon the S&F to normal mode transition time of the serving cell or the normal to S&F mode transition time of the serving cell if at least one of them is before ephemeris expiry. Optionally, a new timer is started to restrict the time duration of the trigger SIB acquiring.
[0186] In the fourth example, if the second transition time of the serving cell is before the expiry of a timer for the SIB acquiring procedure and the UE does not support the S&F mode or prefers the normal mode than the S&F mode, the UE 201 may stop a triggered SIB acquiring procedure in an RRC connected state. For instance, if the UE does not support S&F operation or prefers normal operation, the UE 201 in RRC_CONNECTED stops a triggered SIB (e.g., SIB19 for NR and SIB31 for LTE) acquiring if the normal to S&F mode transition time of the serving cell is before the expiry of the timer for the time duration of the trigger SIB acquiring.
[0187] In the fifth example, if that the first transition time of the serving cell is before the expiry of the timer for the SIB acquiring procedure and the UE supports the S&F mode or prefers the S&F mode than the normal mode, the UE 201 may stop a triggered SIB acquiring procedure in an RRC connected state. For instance, if the UE 201 supports S&F operation or prefers S&F operation, the UE 201 in RRC_CONNECTED may stop a triggered SIB (e.g., SIB19 for NR and SIB31 for LTE) acquiring if the S&F to normal mode transition time of the serving cell is before the expiry of the timer for the time duration of the trigger SIB acquiring.
[0188] In some embodiments, for performing the AS-NAS interaction procedure based on the at least one determined S&F mode transition time, the UE 201 may indicate the at least one determined S&F mode transition time of the serving cell by a AS of the UE 201 to a NAS of the UE 201.
[0189] Alternatively or additionally, the NAS of the UE may indicate the AS of the UE to stop or suspend a transmission, a reception or paging monitoring for a normal service before the first transition time of the serving cell or after the second transition time of the serving cell.
[0190] Additionally, the NAS of the UE may indicate the AS of the UE to start or resume a transmission, a reception or paging monitoring for a normal service after the first transition time of the serving cell or before the second transition time of the serving cell.
[0191] In addition, the NAS of the UE may indicate the AS of the UE to stop or suspend a transmission, a reception or paging monitoring for an S&F service before the second transition time of the serving cell or after the first transition time of the serving cell.
[0192] Additionally, the NAS of the UE may indicate the AS of the UE the AS of the UE to start or resume a transmission, a reception or paging monitoring for a normal service after the second transition time of the serving cell or before the first transition time of the serving cell.
[0193] For UE AS-NAS interaction procedure regarding mode transition time, the UE 201 may perform at least one of following AS-NAS interaction procedures based on the determined mode transition time: UE AS indicates UE NAS the S&F to normal mode transition time of the serving cell; UE AS indicates UE NAS the normal to S&F mode transition time of the serving cell; UE NAS indicates UE AS to stop or suspend transmission, reception or paging monitoring for a normal service before the S&F to normal mode transition time of the serving cell or after the normal to S&F mode transition time of the serving cell; UE NAS indicates UE AS to start or resume transmission, reception or paging monitoring for a normal service after the S&F to normal mode transition time of the serving cell or before the normal to S&F mode transition time of the serving cell; UE NAS indicates UE AS to stop or suspend transmission, reception or paging monitoring for an S&F service before the normal to S&F mode transition time of the serving cell or after the S&F to normal mode transition time of the serving cell; UE NAS indicates UE AS to start or resume transmission, reception or paging monitoring for a normal service after the normal to S&F mode transition time of the serving cell or before the S&F to normal mode transition time of the serving cell.
[0194] FIG. 3 illustrates an example procedure in accordance with aspects of the present disclosure. The procedure 300 may involve a UE 301, a serving eNB / gNB 302, and a neighbour gNB 303. It is understood that the process 300 can be considered as a more specific example of process 200. Thus, the UE 301 in FIG. 3 may be an example of the UE 201 in FIG. 2. The serving eNB / gNB 302 in FIG. 3 may be an example of the first base station 202 in FIG. 2. The neighbour gNB 303 in FIG. 3 may be an example of the second base station 203 in FIG. 2.
[0195] As shown in FIG. 3, at 310, the neighbour gNB 303 may transmit serving cell stop serving time in SIB31 to the serving eNB / gNB 302. At 312, the serving eNB / gNB 302 transmits serving / neighbour cell stop serving time in SIB31 to the UE 301. At 314, the serving eNB / gNB 302 transmits the serving cell S&F operation indication in SIB1 to the UE 301.
[0196] At 316, the serving eNB / gNB 302 may transmit the serving cell S&F to normal mode transition time in SIB1 to the UE 301. At 318, the serving eNB / gNB 302 may transmit the serving cell normal to S&F mode transition time to the UE 301. At 320, the UE 301 performs mode transition time determining (based on serving cell indications) .
[0197] At 322, the serving eNB / gNB 302 may transmit serving cell S&F operation indication to the neighbour gNB 303. At 324, the serving eNB / gNB 302 may transmit serving cell S&F to normal mode transition time to the neighbour gNB 303. At 326, the serving eNB / gNB 302 may transmit the serving cell normal to S&F mode transition time to the neighbour gNB 303.
[0198] At 328, the neighbour gNB 303 may transmit neighbour cell S&F operation indication to the serving eNB / gNB 302. At 330, the serving eNB / gNB 302 may transmit neighbour cell S&F operation indication to the UE 301.
[0199] At 332, the neighbour gNB 303 may transmit neighbour cell S&F to normal mode transition time to the serving eNB / gNB 302. At 334, the serving eNB / gNB 302 may transmit neighbour cell S&F to normal mode transition time to the UE 301.
[0200] At 336, the neighbour gNB 303 may transmit the neighbour cell normal to S&F mode transition time to the serving eNB / gNB 302. At 338, the serving eNB / gNB 302 may transmit neighbour cell S&F to normal mode transition time to the UE 301.
[0201] In an embodiment of information exchange between, the neighbour gNB 303 may indicates to the serving eNB / gNB 302 at least one neighbour cell t-Service, “S&F to normal” mode transition time indication (t-SFtoNORMAL) of the neighbour cell or “normal to S&F” mode transition time indication (t-NORMALtoSF) of the neighbour cell. The serving eNB / gNB 302 can send a request for the above indication to the neighbour gNB 303. The serving eNB / gNB 302 can indicate the above indication of neighbour cell to the UE 301.
[0202] At 340, the UE 301 performs mode transition time determining (based on neighbour cell indications) .
[0203] At 342, the serving eNB / gNB 302 transmits the legacy measurement configuration to the UE 301. At 344, the serving eNB / gNB 302 may transmit the measurement configuration regarding mode transition time to the UE 301. At 346, the UE 301 performs the measurement regarding the mode transition time mode.
[0204] In an embodiment of “S&F to normal” mode transition time indication, the UE 301 in RRC_IDLE or RRC_INACTIVE receives at least one “S&F to normal” mode transition time indication from the serving eNB / gNB 302, and the indication is a shared indication (e.g. t-Service) or a dedicated indication (e.g. t-SFtoNORMAL) , and performs one of the following mobility procedures:
[0205] If the indication is a shared indication of a serving cell (e.g. t-Service that is also used to indicate the cell stop serving time or feeder link switch time) , the UE 301 may: identify the indication as for “S&F to normal” mode transition time if the S&F operation indication is present in SIB1 of serving cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) ; does not trigger neighbour cell measurement before or upon t-Service; does not trigger neighbour cell measurement before or upon t-Service if the UE 301 does not support S&F operation; consider the cell as barred until t-Service if the UE 301 does not support S&F operation.
[0206] If the indication is a shared indication of a neighbour cell (e.g. t-Service that is also used to indicate the cell stop serving time or feeder link switch time) , the UE 301 may: identify the indication as for “S&F to normal” mode transition time if the S&F operation indication is present in SIB1 of neighbour cell, or an explicit indication is indicated, or the UE 301 receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) ; preclude or deprioritize the neighbour cell approaching or approached t-Service for cell reselection including cell ranking if the UE supports S&F operation; preclude the neighbour cell before t-Service for neighbour cell measurement if the UE does not support S&F operation; include or prioritize the neighbour cell upon or after t-Service for cell reselection including cell ranking if the UE does not support S&F operation.
[0207] If the indication is a dedicated indication of a serving cell (e.g. t-SFtoNORMAL) , the UE 301 may: trigger neighbour cell measurement before or upon t-SFtoNORMAL; trigger neighbour cell measurement before or upon t-SFtoNORMAL if it supports S&F operation; consider the cell as barred until t-SFtoNORMAL if it does not support S&F operation.
[0208] If the indication is a dedicated indication of a neighbour cell (e.g. t-SFtoNORMAL) , the UE 301 may: precludes or deprioritizes the neighbour cell approaching or approached t-SFtoNORMAL for cell reselection including cell ranking if it supports S&F operation; preclude the neighbour cell before t-SFtoNORMAL for neighbour cell measurement if it does not support S&F operation; include or prioritize the neighbour cell upon or after t-SFtoNORMAL for cell reselection including cell ranking if it does not support S&F operation.
[0209] In an embodiment of normal to S&F mode transition time indication, the UE 301 in RRC_ID LE or RRC_INACTIVE receives at least one “normal to S&F” mode transition time indication from the serving eNB / gNB 302. The indication is a shared indication (e.g. t-Service) or a dedicated indication (e.g. t-NORMALtoSF) . The UE 301performs one of the following mobility procedures:
[0210] If the indication is a shared indication of a serving cell (e.g. t-Service that is also used to indicate the cell stop serving time or feeder link switch time) , the UE 301 may: identify the indication as for “normal to S&F” mode transition time if the S&F operation indication previously presented is absent in SIB1 of serving cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) ; does not trigger neighbour cell measurement before or upon t-Service; does not trigger neighbour cell measurement before or upon t-Service if it supports S&F operation; consider the cell as barred until t-Service if it supports S&F operation.
[0211] If the indication is a shared indication of a neighbour cell (e.g. t-Service that is also used to indicate the cell stop serving time or feeder link switch time) , the UE 301 may: identify the indication as for “normal to S&F” mode transition time if the S&F operation indication previously presented is absent in SIB1 of neighbour cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) ; preclude or deprioritize the neighbour cell approaching or approached t-Service for cell reselection including cell ranking if it does not support S&F operation; preclude the neighbour cell before t-Service for neighbour cell measurement if it supports S&F operation; include or prioritize the neighbour cell upon or after t-Service for cell reselection including cell ranking if it supports S&F operation.
[0212] If the indication is a dedicated indication of a serving cell (e.g. t-NORMALtoSF) , the UE 301 may: trigger neighbour cell measurement before or upon t-NORMALtoSF; trigger neighbour cell measurement before or upon t-NORMALtoSF if it supports S&F operation; consider the cell as barred until t-NORMALtoSF if it does not support S&F operation.
[0213] If the indication is a dedicated indication of a neighbour cell (e.g. t-NORMALtoSF) , the UE 301 may: preclude or deprioritize the neighbour cell approaching or approached t-NORMALtoSF for cell reselection including cell ranking if it does not support S&F operation; preclude the neighbour cell before t-NORMALtoSF for neighbour cell measurement if it supports S&F operation; include or prioritize the neighbour cell upon or after t-NORMALtoSF for cell reselection including cell ranking if it supports S&F operation.
[0214] At 348, the serving eNB / gNB 302 transmits the legacy measurement configuration to the UE 301. At 350, the serving eNB / gNB 302 may transmit the mobility configuration regarding mode transition time to the UE 301. At 352, the UE 301 performs the mobility procedure regarding mode transition time mode.
[0215] In one embodiment of the mobility procedure, the UE 301 in RRC_CONNECTED receives at least one “S&F to normal” mode transition time indication from the serving eNB / gNB 302. The indication is a shared indication (e.g. t-Service) or a dedicated indication (e.g. t-SFtoNORMAL) , and performs one of the following mobility procedures:
[0216] Suspend, stop or ignore serving / neighbour cell measurement on at least one measurement object associated to normal mode until the “S&F to normal” mode transition time of the serving / neighbour cell; suspend, stop or ignore measurement report triggering associated to a serving / neighbour cell operating in normal mode until the “S&F to normal” mode transition time of the serving / neighbour cell; preclude content associated to a serving / neighbour cell operating in normal mode in the measurement report until the “S&F to normal” mode transition time of the serving / neighbour cell; resume, start or restart serving / neighbour cell measurement on at least one measurement object associated to normal mode upon or after “S&F to normal” mode transition time of the serving / neighbour cell; resume or apply measurement report triggering associated to a serving / neighbour cell operating in normal mode upon or after “S&F to normal” mode transition time of the serving / neighbour cell; include content associated to a serving / neighbour cell operating in normal mode in the measurement report upon or after “S&F to normal” mode transition time of the serving / neighbour cell; trigger measurement reporting before or upon “S&F to normal” mode transition time of the serving cell; trigger RLF, consider RLF occurred, trigger re-establishment or cell reselection before or upon “S&F to normal” mode transition time of the serving cell; trigger satellite switch with re-sync procedures upon “S&F to normal” mode transition time of the serving cell (e.g. when the indication is a dedicated indication t-SFtoNORMAL) ; ignore triggering satellite switch with re-sync procedures upon “S&F to normal” mode transition time of the serving cell (e.g. when the indication is a shared indication t-Service) ; start to evaluate a neighbour cell for CHO upon or after “S&F to normal” mode transition time of the neighbour cell.
[0217] In another embodiment of the mobility procedure, the UE 301 in RRC_CONNECTED receives at least one “normal to S&F” mode transition time indication from the serving eNB / gNB 302. The indication is a shared indication (e.g. t-Service) or a dedicated indication (e.g. t-NORMALtoSF) , and performs one of the following mobility procedures:
[0218] Suspend, stop or ignore serving / neighbour cell measurement on at least one measurement object associated to S&F mode until the “normal to S&F” mode transition time of the serving / neighbour cell, at least when the UE supports or prefers S&F operation; suspend, stop or ignore measurement report triggering associated to a serving / neighbour cell operating in S&F mode until the “normal to S&F” mode transition time of the serving / neighbour cell; preclude content associated to a serving / neighbour cell operating in S&F mode in the measurement report until the “normal to S&F” mode transition time of the serving / neighbour cell; resume, start or restart serving / neighbour cell measurement on at least one measurement object associated to S&F mode upon or after “normal to S&F” mode transition time of the serving / neighbour cell, at least when the UE supports or prefers S&F operation; resume or apply measurement report triggering associated to a serving / neighbour cell operating in S&F mode upon or after “normal to S&F” mode transition time of the serving / neighbour cell; include content associated to a serving / neighbour cell operating in S&F mode in the measurement report upon or after “normal to S&F” mode transition time of the serving / neighbour cell; trigger measurement reporting before or upon “normal to S&F” mode transition time of the serving cell, at least when the UE does not support or prefers normal operation; trigger RLF, consider RLF occurred, trigger re-establishment or cell reselection before or upon “normal to S&F” mode transition time of the serving cell, at least when the UE does not support or prefers normal operation; trigger satellite switch with re-sync procedures upon “normal to S&F” mode transition time of the serving cell, at least when the UE does not support or prefers normal operation; ignore triggering satellite switch with re-sync procedures upon “normal to S&F” mode transition time of the serving cell, at least when the UE supports or prefers S&F operation; start to evaluate a neighbour cell for CHO upon or after “normal to S&F” mode transition time of the neighbour cell.
[0219] At 354, the UE 301 performs the SI acquiring regarding mode transition time mode. In one embodiment, the UE 301 receives at least one “normal to S&F to normal” or “normal to S&F” mode transition time indication from the serving eNB / gNB 302, and performs one of the following SI acquiring (e.g. SIB31 acquiring) procedures:
[0220] If the UE 301 is in RRC_IDLE or RRC_INACTIVE, the UE 301 triggers SIB31 acquiring at least for the mode transition time update before or upon indicated “normal to S&F to normal” or “normal to S&F” mode transition time.
[0221] If the UE 301 is in RRC_CONNECTED and the indicated “normal to S&F to normal” or “normal to S&F” mode transition time is before T317 expiry (i.e. ephemeris expiry) , the UE 301 triggers SIB31 acquiring before or upon indicated “normal to S&F to normal” or “normal to S&F” mode transition time. Upon triggering UE starts T318 or another new timer for SIB31 acquiring.
[0222] If the UE 301 is in RRC_CONNECTED and the indicated “normal to S&F to normal” or “normal to S&F” mode transition time is after T317 expiry (i.e. ephemeris expiry) during T318 running, the UE 301 may choose to stop SIB31 acquiring if the serving cell is to transit to a mode not supported or preferred by the UE 301.
[0223] At 356, the UE 301 performs AS-NAS interaction regarding mode transition time mode. In one embodiment, UE AS receives at least one “normal to S&F to normal” or “normal to S&F” mode transition time indication from the serving eNB / gNB 302, and UE AS indicates UE NAS the indicated “normal to S&F to normal” or “normal to S&F” mode transition time. UE NAS can decide whether to initiate a normal or S&F service based on the “normal to S&F to normal” or “normal to S&F” mode transition time from UE AS.
[0224] At 358, the serving eNB / gNB 302 may perform data forwarding regarding S&F to the neighbour gNB 303. At 358, the serving eNB / gNB 302 may perform SN status transfer regarding S&F to the neighbour gNB 303.
[0225] In one embodiment, during HO procedures, the serving eNB / gNB 302 operating in S&F mode decides to forward S&F service data to the neighbour gNB 303 or to keep the user data to be delivered to core network when connected. If the S&F service data is forwarded to the neighbour gNB 303, the serving eNB / gNB 302 can indicate that the data is for S&F service, or the data is the last data not delivered to core network. The serving eNB / gNB 302 operating in S&F mode decides the SN status to be transferred to the neighbour gNB 303 based on whether the S&F service data is forwarded to the neighbour eNB / gNB 303 or is kept to be delivered to core network.
[0226] In view of above example embodiments, potential solutions are proposed for above-mentioned issues. The first solution is for the cell reselection considering mode transition time. The second solution is for the connected mobility considering mode transition time. The third solution is for the SIB31 acquiring considering mode transition time. The fourth solution is for the UE AS-NAS functional split and interaction considering mode transition time.
[0227] In option 1 of the first solution, t-Service is reused as “S&F to normal” mode transition time indication. The serving cell may identify the indication as for “S&F to normal” mode transition time if the S&F operation indication is present in SIB1 of serving cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) .
[0228] If assume all S&F services can be supported in normal mode, serving cell t-Service does not trigger neighbour cell measurement for all UEs. If assume some S&F services cannot be supported in normal mode, serving cell t-Service may trigger neighbour cell measurement for S&F-capable UEs. Serving cell t-Service indicates the cell barring end time at least for S&F-incapable UEs, i.e., S&F-incapable UE considers the cell as barred until t-Service.
[0229] The neighbour cell may identify the indication as for “S&F to normal” mode transition time if the S&F operation indication is present in SIB1 of neighbour cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) .
[0230] If assume all S&F services can be supported in normal mode, the neighbour cell t-Service is not considered for cell reselection. (no further spec impact) . If assume some S&F services cannot be supported in normal mode, neighbour cell t-Service is considered for cell reselection. S&F-capable UE can preclude or deprioritize a neighbour cell approaching t-Service for cell ranking.
[0231] Neighbour cell t-Service indicates the end time of precluding the cell for reselection for S&F-incapable UEs. Neighbour cell t-Service may also indicate the start time of precluding or deprioritizing the cell for reselection for S&F-capable UEs.
[0232] In option 2 of the first solution, t-Service is not used as “S&F to normal” mode transition time indication, and a new “S&F to normal” mode transition time indication (t-SFtoNORMAL) is introduced.
[0233] For the serving cell, if assume all S&F services can be supported in normal mode, the first indication (t-SFtoNORMAL) of serving cell does not trigger neighbour cell measurement for all UEs. If assume some S&F services cannot be supported in normal mode, the first indication (t-SFtoNORMAL) of serving cell may trigger neighbour cell measurement for S&F-capable UEs. The first indication (t-SFtoNORMAL) of serving cell indicates the cell barring end time at least for S&F-incapable UEs, i.e., S&F-incapable UE considers the cell as barred until t-SFtoNORMAL.
[0234] For the neighbour cell, if assume all S&F services can be supported in normal mode, the first indication (t-SFtoNORMAL) of neighbour cell is not considered for cell reselection. If assume some S&F services cannot be supported in normal mode, the first indication (t-SFtoNORMAL) of neighbour cell is considered for cell reselection. S&F-capable UE can preclude or deprioritize a neighbour cell approaching the first indication (t-SFtoNORMAL) for cell ranking.
[0235] The first indication (t-SFtoNORMAL) of neighbour cell indicates the end time of precluding the cell for reselection for S&F-incapable UEs. The first indication (t-SFtoNORMAL) of neighbour cell may also indicate the start time of precluding or deprioritizing the cell for reselection for S&F-capable UEs.
[0236] In option 3 of the first solution, t-Service is reused “normal to S&F” mode transition time indication. The serving cell may identify the indication as for “normal to S&F” mode transition time if the S&F operation indication previously presented is absent in SIB1 of serving cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) .
[0237] Serving cell t-Service may trigger neighbour cell measurement for S&F-incapable UEs, and does not trigger neighbour cell measurement for S&F-capable UEs. Serving cell t-Service may indicate the cell barring start time for S&F-incapable UEs.
[0238] The neighbour cell may identify the indication as for “normal to S&F” mode transition time if the S&F operation indication previously presented is absent in SIB1 of neighbour cell, or an explicit indication is indicated, or UE receives an indication that the cell supports S&F operation (from AS signalling or from NAS signalling and NAS-AS interaction) .
[0239] Neighbour cell t-Service is considered for cell reselection. S&F-incapable UE can preclude or deprioritize a neighbour cell approaching t-Service for cell ranking. Neighbour cell t-Service may indicate the start time of precluding or deprioritizing the cell for reselection for S&F-incapable UEs. Neighbour cell t-Service may also indicate the end time of precluding the cell for reselection for S&F-capable UEs.
[0240] In option 4 of the first solution, t-Service is not used as “normal to S&F” mode transition time indication, and a new “normal to S&F” mode transition time indication (t-NORMALtoSF) is introduced.
[0241] For the serving cell, the second indication (t-NORMALtoSF) of serving cell triggers neighbour cell measurement for S&F-incapable UEs. The second indication (t-NORMALtoSF) of serving cell indicates the cell barring start time for S&F-incapable UEs.
[0242] For the neighbour cell, the second indication (t-NORMALtoSF) of neighbour cell is considered for cell reselection. S&F-incapable UE can preclude or deprioritize a neighbour cell approaching the second indication (t-NORMALtoSF) for cell ranking. The second indication (t-NORMALtoSF) of neighbour cell indicates the start time of precluding or deprioritizing the cell for reselection for S&F-incapable UEs. The second indication (t-NORMALtoSF) of neighbour cell may also indicate the end time of precluding the cell for reselection for S&F-capable UEs.
[0243] In all above options of the first solution, neighbour cell t-Service, the first indication (t-SFtoNORMAL) of neighbour cell or the second indication (t-NORMALtoSF) of neighbour cell can be provided from neighbour eNB to serving eNB.
[0244] In the second Solution, for the serving cell, the UE may choose to suspend / stop / ignore or resume / restart / include measurements on measurement objects associated to a specific mode, or measurement report triggering associated to cell operating in a specific mode, or measurement report content associated to cell operating in a specific mode based on the mode transition indicated and S&F capability.
[0245] The eMTC UE can be configured to trigger measurement reporting before serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) based on S&F capability. Event T1 for measurement report triggering.
[0246] The NB-IoT UE can trigger RLF, re-establishment or reselection before or upon serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) based on S&F capability. The UE can choose to trigger satellite switch with re-sync procedures or not upon serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) based on S&F capability.
[0247] For the neighbour cell, neighbour cell t-Service, the first indication (t-SFtoNORMAL) of neighbour cell or the second indication (t-NORMALtoSF) of neighbour cell can be provided from neighbour eNB to serving eNB.
[0248] For HO, the serving eNB operating in S&F mode may decide the data to be forwarded to the neighbour eNB based on whether the corresponding data has been delivered to MME. Additionally, there could be an indication in data forwarding indicating that the forwarded data is for S&F service, or is for the last data not delivered to MME.
[0249] For HO, the serving eNB operating in S&F mode may decide the SN status to be transferred to neighbour eNB based on whether the corresponding data has been delivered to MME. Additionally, there could be an indication in SN status transfer indicating that the SN is for the last SDU delivered to MME or not. The eMTC UE can be configured to evaluate or execute CHO considering candidate cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) based on S&F capability.
[0250] In the third solution, for UE in IDLE, the UE acquires SIB31 for the mode transition time update before or upon serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) based on S&F capability.
[0251] For UE in CONNECTED state, if serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) is before T317 expiry, the UE acquires SIB31 for the mode transition time update before or upon serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) based on S&F capability. T318 is started or another timer T318a is introduced.
[0252] If serving cell t-Service, the first indication (t-SFtoNORMAL) or the second indication (t-NORMALtoSF) is after T317 expiry, the UE may choose to stop SIB31 acquiring (T318) based on S&F capability.
[0253] In the fourth solution, UE AS indicates UE NAS the received serving cell t-Service or the first indication (t-SFtoNORMAL) , and UE NAS considers it as the time when normal UL service initiation or normal DL service paging can be resumed, or when S&F UL service initiation or S&F DL service paging can be suspended.
[0254] UE AS indicates UE NAS the received serving cell t-Service or the second indication (t-NORMALtoSF) , and UE NAS considers it as the time when S&F UL service initiation or S&F DL service paging can be resumed, or when normal UL service initiation or normal DL service paging can be suspended.
[0255] In general, example embodiments of the present disclosure focus on the potential impact of transition time between S&F mode and normal mode on mobility management and related procedures, considering all possible options of introducing mode transition time indications.
[0256] The measurement configuration and execution, measurement reporting, mobility configuration and execution are enhanced with mode transition time involved to minimize mobility interruption and avoid unnecessary mobility based on UE’s S&F capabilities. The SI acquiring and AS-NAS interaction regarding mode transition time are also considered and enhanced to support system information update and service management for mode transition.
[0257] FIG. 4 illustrates an example of a device 400 that supports S&F mode transition in accordance with aspects of the present disclosure. The device 400 may be an example of a UE 104 or a network entity 102 as described herein. The device 400 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof. The device 400 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 402, a memory 404, a transceiver 406, and, optionally, an I / O controller 408. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0258] The processor 402, the memory 404, the transceiver 406, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 402, the memory 404, the transceiver 406, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
[0259] In some implementations, the processor 402, the memory 404, the transceiver 406, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 402 and the memory 404 coupled with the processor 402 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 402, instructions stored in the memory 404) .
[0260] For example, the processor 402 may support wireless communication at the device 400 in accordance with examples as disclosed herein. The processor 402 may be configured to operable to support a means for determining, based on at least one time indication from a first base station, at least one store and forward (S&F) mode transition time of a cell, and based on the at least one determined S&F mode transition time of the cell, means for performing at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an access stratum (AS) -non-access stratum (NAS) interaction procedure. The processor 402 may be configured to operable to support other means for other implementations of method 600.
[0261] The processor 402 may be also configured to operable to support a means for receiving, via the transceiver from a second base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station, and means for determining at least one of a measurement configuration or a mobility configuration based on the at least one S&F mode transition time of the cell. The processor 402 may be configured to operable to support other means for other implementations of method 700.
[0262] The processor 402 may be configured to operable to support a means for transmitting, via the transceiver to a first base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station. The processor 402 may be configured to operable to support other means for other implementations of method 800.
[0263] The processor 402 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 402 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 402. The processor 402 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 404) to cause the device 400 to perform various functions of the present disclosure.
[0264] The memory 404 may include random access memory (RAM) and read-only memory (ROM) . The memory 404 may store computer-readable, computer-executable code including instructions that, when executed by the processor 402 cause the device 400 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 402 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 404 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0265] The I / O controller 408 may manage input and output signals for the device 400. The I / O controller 408 may also manage peripherals not integrated into the device M02. In some implementations, the I / O controller 408 may represent a physical connection or port to an external peripheral. In some implementations, the I / O controller 408 may utilize an operating system such as or another known operating system. In some implementations, the I / O controller 408 may be implemented as part of a processor, such as the processor 406. In some implementations, a user may interact with the device 400 via the I / O controller 408 or via hardware components controlled by the I / O controller 408.
[0266] In some implementations, the device 400 may include a single antenna 410. However, in some other implementations, the device 400 may have more than one antenna 410 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 406 may communicate bi-directionally, via the one or more antennas 410, wired, or wireless links as described herein. For example, the transceiver 406 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 406 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 410 for transmission, and to demodulate packets received from the one or more antennas 410. The transceiver 406 may include one or more transmit chains, one or more receive chains, or a combination thereof.
[0267] A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 410 for transmitting the amplified signal into the air or wireless medium.
[0268] A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 410 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0269] FIG. 5 illustrates an example of a processor 500 that supports S&F mode transition in accordance with aspects of the present disclosure. The processor 500 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 500 may include a controller 502 configured to perform various operations in accordance with examples as described herein. The processor 500 may optionally include at least one memory 504. Additionally, or alternatively, the processor 500 may optionally include one or more arithmetic-logic units (ALUs) 500. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0270] The processor 500 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 500) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0271] The controller 502 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 500 to cause the processor 500 to support various operations in accordance with examples as described herein. For example, the controller 502 may operate as a control unit of the processor 500, generating control signals that manage the operation of various components of the processor 500. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0272] The controller 502 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 504 and determine subsequent instruction (s) to be executed to cause the processor 500 to support various operations in accordance with examples as described herein. The controller 502 may be configured to track memory address of instructions associated with the memory 504. The controller 502 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 502 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 500 to cause the processor 500 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 502 may be configured to manage flow of data within the processor 500. The controller 502 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 500.
[0273] The memory 504 may include one or more caches (e.g., memory local to or included in the processor 500 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 504 may reside within or on a processor chipset (e.g., local to the processor 500) . In some other implementations, the memory 504 may reside external to the processor chipset (e.g., remote to the processor 500) .
[0274] The memory 504 may store computer-readable, computer-executable code including instructions that, when executed by the processor 500, cause the processor 500 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 502 and / or the processor 500 may be configured to execute computer-readable instructions stored in the memory 504 to cause the processor 500 to perform various functions (e.g., functions or tasks supporting transmit power prioritization ) . For example, the processor 500 and / or the controller 502 may be coupled with or to the memory 504, the processor 500, the controller 502, and the memory 504 may be configured to perform various functions described herein. In some examples, the processor 500 may include multiple processors and the memory 504 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0275] The one or more ALUs 500 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 500 may reside within or on a processor chipset (e.g., the processor 500) . In some other implementations, the one or more ALUs 500 may reside external to the processor chipset (e.g., the processor 500) . One or more ALUs 500 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 500 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 500 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 500 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 500 to handle conditional operations, comparisons, and bitwise operations.
[0276] The processor 500 may support wireless communication in accordance with examples as disclosed herein. The processor 502 may be configured to or operable to support a means for determining, based on at least one time indication from a first base station, at least one store and forward (S&F) mode transition time of a cell, and based on the at least one determined S&F mode transition time of the cell, means for performing at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an access stratum (AS) -non-access stratum (NAS) interaction procedure. The processor 500 may be configured to or operable to support other means for other implementations of method 600.
[0277] The processor 502 may also be configured to or operable to support a means for receiving, via the transceiver from a second base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station, and means for determining at least one of a measurement configuration or a mobility configuration based on the at least one S&F mode transition time of the cell. The processor 500 may be configured to or operable to support other means for other implementations of method 700.
[0278] The processor 502 may also be configured to or operable to support a means for transmitting, via the transceiver to a first base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station. The processor 500 may be configured to or operable to support other means for other implementations of method 800.
[0279] FIG. 6 illustrates a flowchart of a method 600 that supports [INSERT SPECIFIC TO INVENTION] in accordance with aspects of the present disclosure. The operations of the method 600 may be implemented by a device or its components as described herein. For example, the operations of the method 600 may be performed by UE 104 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0280] At 605, the method may include determining, based on at least one time indication from a first base station, at least one store and forward (S&F) mode transition time of a cell. The operations of 605 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 605 may be performed by a device as described with reference to FIG. 1.
[0281] At 610, the method may include based on the at least one determined S&F mode transition time of the cell, performing at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an access stratum (AS) -non-access stratum (NAS) interaction procedure.. The operations of 610 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 610 may be performed by a device as described with reference to FIG. 1.
[0282] In some embodiments, the S&F mode transition time may comprise one of: a first transition time from a S&F mode to a normal mode, or a second transition time from the normal mode to the S&F mode, the at least one time indication may comprise at least one of: a first indication indicating stop serving time of the cell, a second indication indicating that the stop serving time is used as the first transition time, a third indication indicating that the cell supports the S&F mode, a fourth indication indicating the first transition time, a fifth indication indicating that the stop serving time is used as the second transition time, or a sixth indication indicating the second transition time, a S&F operation indication of the cell, or the cell may comprise one of a serving cell provided by the first base station or a neighbour cell provided by a second base station.
[0283] In some embodiments, the method may further include determining the at least one S&F mode transition time based on the at least one time indication by at least one of the following: determining stop serving time of the cell indicated by the first indication as the first transition time in the case that a S&F operation indication of the cell is present, determining the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the second indication, determining the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the third indication, determining time indicated by a fourth indication as the first transition time based on receiving the fourth indication, determining the stop serving time of the cell indicated by the first indication as the second transition time in the case that a previously presented S&F operation indication of the cell is absent, determining the stop serving time of the cell as the second transition time based on receiving the fifth indication, determining the stop serving time of the cell as the second transition time based on receiving the third indication, or determining time indicated by the sixth indication as the second transition time based on receiving the sixth indication.
[0284] In some embodiments, the UE does not support the S&F mode or prefers the normal mode than the S&F mode, the method may further include performing the measurement procedure based on the at least one determined S&F mode transition time by at least one of the following: skipping triggering a neighbour cell measurement before or upon the first transition time of a serving cell in a radio resource control (RRC) idle state or an RRC inactive state, triggering a neighbour cell measurement before or upon the second transition time of the serving cell in an RRC idle state or an RRC inactive state, suspending, stopping or ignoring at least one cell measurement on at least one measurement object associated with the normal mode until the first transition time of the cell in an RRC connected state, or resuming, starting or restarting at least one cell measurement on at least one measurement object associated with the normal mode upon or after the first transition time of the cell in an RRC connected state.
[0285] In some embodiments, the UE supports the S&F mode or prefers the S&F mode than the normal mode, the method may further include performing the measurement procedure based on the at least one determined S&F mode transition time by at least one of the following: skipping triggering a neighbour cell measurement before or upon the second transition time of a serving cell in an RRC state or an RRC inactive state, triggering a neighbour cell measurement before or upon the first transition time of the serving cell in an RRC idle state or an RRC inactive state, suspending, stopping or ignoring at least one cell measurement on at least one measurement object associated with the S&F mode until the second transition time of the cell in an RRC connected state, or resuming, starting or restarting at least one cell measurement on at least one measurement object associated with the S&F mode upon or after the second transition time of the cell in an RRC connected state.
[0286] In some embodiments, the UE does not support the S&F mode or prefers the normal mode than the S&F mode, the method may further include performing the mobility procedure based on the at least one determined S&F mode transition time by at least one of the following: precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the second transition time of the neighbour cell, precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell has not approached the first transition time of the neighbour cell, including or prioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached its first transition time, triggering a measurement report before or upon the second transition time of the serving cell in an RRC connected state, indicating the preference for the normal mode in the triggered measurement report, suspending, stopping or ignoring measurement report triggering associated with a cell operating in the normal mode until the first transition time of the cell in an RRC connected state, precluding content associated with a cell operating in the normal mode from the measurement report until the first transition time of the cell in an RRC connected state, resuming or applying measurement report triggering associated with a cell operating in the normal mode upon or after the first transition time of the cell in an RRC connected state, including content associated with a cell operating in the normal mode in the measurement report upon or after the first transition time of the cell in an RRC connected state, triggering a radio link failure (RLF) and a re-establishment or a cell reselection before or upon the second transition time of the serving cell in an RRC connected state, triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state, skipping triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state, suspending, stopping or ignoring a conditional handover (CHO) evaluation for a neighbour cell in the case that the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state, or resuming, starting or restarting a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state.
[0287] In some embodiments, the UE supports the S&F mode or prefers the S&F mode than the normal mode, the method may further include performing the mobility procedure based on the at least one determined S&F mode transition time by at least one of the following: precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the first transition time of the neighbour cell, precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell has not approached the second transition time of the neighbour cell, including or prioritizing a neighbour cell for a cell reselection including cell ranking in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the second transition time of the neighbour cell, triggering a measurement report before or upon the first transition time of the serving cell in an RRC connected state, indicating the preference for the S&F mode in the triggered measurement report, suspending, stopping or ignoring measurement report triggering associated with a cell operating in the S&F mode until the second transition time of the cell in an RRC connected state, precluding content associated with a cell operating in the S&F mode from the measurement report until the second transition time of the cell in an RRC connected state, resuming or applying measurement report triggering associated with a cell operating in the S&F mode upon or after the second transition time of the cell in an RRC connected state, including content associated with a cell operating in the S&F mode in the measurement report upon or after the second transition time of the cell in an RRC connected state, triggering an RLF and a re-establishment or a cell reselection before or upon the first transition time of the serving cell in an RRC connected state, triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state, skipping triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state, suspending, stopping or ignoring a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state, or resuming, starting or restarting a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state.
[0288] In some embodiments, the method may further include performing the SI acquiring procedure based on the at least one determined S&F mode transition time by at least one of the following: triggering a system information block (SIB) acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC idle state or an RRC inactive state, triggering a SIB acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC connected state in the case that at least one of the first transition time or the second transition time is before an ephemeris expiry, starting a timer for the SIB acquiring procedure upon triggering the SIB acquiring procedure, stopping a triggered SIB acquiring procedure in an RRC connected state in the case that the second transition time of the serving cell is before the expiry of a timer for the SIB acquiring procedure and the UE does not support the S&F mode or prefers the normal mode than the S&F mode, or stopping a triggered SIB acquiring procedure in an RRC connected state in the case that the first transition time of the serving cell is before the expiry of the timer for the SIB acquiring procedure and the UE supports the S&F mode or prefers the S&F mode than the normal mode.
[0289] In some embodiments, the method may further include performing the AS-NAS interaction procedure based on the at least one determined S&F mode transition time by: indicating the at least one determined S&F mode transition time of the serving cell by a AS of the UE to a NAS of the UE.
[0290] In some embodiments, the method may further include performing the AS-NAS interaction procedure based on the at least one determined S&F mode transition time by at least one of the following: indicating, by the NAS of the UE, the AS of the UE to stop or suspend a transmission, a reception or paging monitoring for a normal service before the first transition time of the serving cell or after the second transition time of the serving cell, indicating, by the NAS of the UE, the AS of the UE to start or resume a transmission, a reception or paging monitoring for a normal service after the first transition time of the serving cell or before the second transition time of the serving cell, indicating, by the NAS of the UE, the AS of the UE to stop or suspend a transmission, a reception or paging monitoring for an S&F service before the second transition time of the serving cell or after the first transition time of the serving cell, or indicating, by the NAS of the UE, the AS of the UE to start or resume a transmission, a reception or paging monitoring for a normal service after the second transition time of the serving cell or before the first transition time of the serving cell.
[0291] FIG. 7 illustrates a flowchart of a method 700 that supports [INSERT SPECIFIC TO INVENTION] in accordance with aspects of the present disclosure. The operations of the method 700 may be implemented by a device or its components as described herein. For example, the operations of the method 700 may be performed by a network entity 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0292] At 705, the method may include receiving, from a second base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station. The operations of 705 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 705 may be performed by a device as described with reference to FIG. 1.
[0293] At 710, the method may include determining at least one of a measurement configuration or a mobility configuration based on the at least one S&F mode transition time of the cell. The operations of 710 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of [B] may be performed by a device as described with reference to FIG. 1.
[0294] In some embodiments, at least one of the following: the measurement configuration may comprise at least one of a configuration of a measurement object or a configuration of a measurement report, or the mobility configuration may comprise at least one of: a configuration of a conditional handover (CHO) , or a configuration of data forward.
[0295] In some embodiments, the S&F mode transition time may comprise one of a first transition time from a S&F mode to a normal mode or a second transition time from the normal mode to the S&F mode.
[0296] In some embodiments, the method may further include receiving the at least one S&F mode transition time by at least one of the following: receiving a first indication indicating stop serving time of the cell and a S&F operation indication of the cell, receiving a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time, receiving a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time, receiving a fourth indication indicating the first transition time, or receiving a sixth indication indicating the second transition time.
[0297] In some embodiments, the method may further include transmitting, to the second base station, a request for the at least one S&F mode transition time of the cell.
[0298] In some embodiments, the method may further include receiving, from the second base station, a request for the at least one S&F mode transition time of a cell provided by the first base station, and transmitting, to the second base station, at least one S&F mode transition time of the cell provided by the first base station.
[0299] In some embodiments, the method may further include determining the configuration of the measurement object based on the at least one S&F mode transition time of the cell by at least one of the following: determining at least one measurement object associated with the normal mode for at least one cell measurement based on the at least one S&F mode transition time, or determining at least one measurement object associated with the S&F mode for at least one cell measurement based on the at least one S&F mode transition time.
[0300] In some embodiments, the method may further include determining the configuration of the measurement report based on the at least one S&F mode transition time of the cell by at least one of the following: determining a triggering condition of a measurement report associated with the second transition time of a cell provided by the first base station based on the at least one S&F mode transition time, determining a triggering condition of a measurement report associated with the first transition time of the cell provided by the first base station based on the at least one S&F mode transition time, or determining content of a measurement report including a user equipment (UE) preference for the normal mode or the S&F mode based on the at least one S&F mode transition time.
[0301] In some embodiments, the method may further include determining the configuration of the CHO based on the at least one S&F mode transition time of the cell by at least one of the following: determining a CHO condition for a neighbour cell associated with the second transition time of the neighbour cell, or determining a CHO condition for a neighbour cell associated with the first transition time of the neighbour cell.
[0302] In some embodiments, the method may further include performing a mobility procedure based on the at least one S&F mode transition time.
[0303] In some embodiments, the method may further include performing the mobility procedure based on the at least one S&F mode transition time by at least one of the following: determining whether to forward data of S&F service to the second base station or to keep the data to be delivered to core network when connected to the core network, or generating a seventh indication indicating at least one of the forwarded data is for S&F service, or the forwarded data is the last data not delivered to the core network.
[0304] In some embodiments, the method may further include performing the mobility procedure based on the at least one S&F mode transition time by at least one of the following: determining a status of a serial number (SN) to be transferred to the second base station based on whether the S&F service data is forwarded to the second base station or is kept to be delivered to a core network, or generating an eighth indication indicating whether the SN is for the last service data unit SDU delivered to the core network.
[0305] In some embodiments, the method may further include transmitting, to the UE, at least one time indication for one or more S&F mode transition time, wherein the one or more S&F mode transition time comprises at least one of: at least one of S&F mode transition time of the cell, or at least one of S&F mode transition time of the cell at least one of S&F mode transition time of a cell provided by the first base station.
[0306] FIG. 8 illustrates a flowchart of a method 800 that supports [INSERT SPECIFIC TO INVENTION] in accordance with aspects of the present disclosure. The operations of the method 800 may be implemented by a device or its components as described herein. For example, the operations of the method 800 may be performed by a network entity 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0307] At 805, the method may include transmitting, to a first base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station.. The operations of 805 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 805 may be performed by a device as described with reference to FIG. 1.
[0308] In some embodiments, the S&F mode transition time may comprise one of a first transition time from a S&F mode to a normal mode or a second transition time from a normal mode to a S&F mode.
[0309] In some embodiments, the method may further include transmitting the at least one S&F mode transition time by at least one of the following: transmitting a first indication indicating stop serving time of the cell and a S&F operation indication of the cell, transmitting a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time, transmitting a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time, transmitting a fourth indication indicating the first transition time, or transmitting a sixth indication indicating the second transition time.
[0310] In some embodiments, the method may further include receiving, from the first base station, a request for the at least one S&F mode transition time of the cell.
[0311] In some embodiments, the method may further include transmitting, to the first base station, a request for the at least one S&F mode transition time of a cell provided by the first base station, and receiving, from the first base station, at least one S&F mode transition time of the cell provided by the first base station.
[0312] It should be noted that the methods described herein describes possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0313] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
[0314] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0315] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
[0316] As used herein, including in the claims, an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
[0317] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
A user equipment (UE) comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:determine, based on at least one time indication from a first base station, at least one store and forward (S&F) mode transition time of a cell; andbased on the at least one determined S&F mode transition time of the cell, perform at least one of: a measurement procedure, a mobility procedure, a system information (SI) acquiring procedure, or an access stratum (AS) -non-access stratum (NAS) interaction procedure.The UE of claim 1, wherein at least one of the following:the S&F mode transition time comprises one of: a first transition time from a S&F mode to a normal mode, or a second transition time from the normal mode to the S&F mode;the at least one time indication comprises at least one of: a first indication indicating stop serving time of the cell, a second indication indicating that the stop serving time is used as the first transition time, a third indication indicating that the cell supports the S&F mode, a fourth indication indicating the first transition time, a fifth indication indicating that the stop serving time is used as the second transition time, a sixth indication indicating the second transition time, or a S&F operation indication of the cell; orthe cell comprises one of a serving cell provided by the first base station or a neighbour cell provided by a second base station.The UE of claim 1 or 2, wherein the processor is configured to determine the at least one S&F mode transition time based on the at least one time indication by at least one of the following:determining stop serving time of the cell indicated by the first indication as the first transition time in the case that a S&F operation indication of the cell is present;determining the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the second indication;determining the stop serving time of the cell indicated by the first indication as the first transition time based on receiving the third indication;determining time indicated by a fourth indication as the first transition time based on receiving the fourth indication;determining the stop serving time of the cell indicated by the first indication as the second transition time in the case that a previously presented S&F operation indication of the cell is absent;determining the stop serving time of the cell as the second transition time based on receiving the fifth indication;determining the stop serving time of the cell as the second transition time based on receiving the third indication; ordetermining time indicated by the sixth indication as the second transition time based on receiving the sixth indication.The UE of claim 1 or 2, wherein the UE does not support the S&F mode or prefers the normal mode than the S&F mode, and the processor is configured to perform the measurement procedure based on the at least one determined S&F mode transition time by at least one of the following:skipping triggering a neighbour cell measurement before or upon the first transition time of a serving cell in a radio resource control (RRC) idle state or an RRC inactive state;triggering a neighbour cell measurement before or upon the second transition time of the serving cell in an RRC idle state or an RRC inactive state;suspending, stopping or ignoring at least one cell measurement on at least one measurement object associated with the normal mode until the first transition time of the cell in an RRC connected state; orresuming, starting or restarting at least one cell measurement on at least one measurement object associated with the normal mode upon or after the first transition time of the cell in an RRC connected state.The UE of claim 1 or 2, wherein the UE supports the S&F mode or prefers the S&F mode than the normal mode, and the processor is configured to perform the measurement procedure based on the at least one determined S&F mode transition time by at least one of the following:skipping triggering a neighbour cell measurement before or upon the second transition time of a serving cell in an RRC state or an RRC inactive state;triggering a neighbour cell measurement before or upon the first transition time of the serving cell in an RRC idle state or an RRC inactive state;suspending, stopping or ignoring at least one cell measurement on at least one measurement object associated with the S&F mode until the second transition time of the cell in an RRC connected state; orresuming, starting or restarting at least one cell measurement on at least one measurement object associated with the S&F mode upon or after the second transition time of the cell in an RRC connected state.The UE of claim 1 or 2, wherein the UE does not support the S&F mode or prefers the normal mode than the S&F mode, and the processor is configured to perform the mobility procedure based on the at least one determined S&F mode transition time by at least one of the following:precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the second transition time of the neighbour cell;precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell has not approached the first transition time of the neighbour cell;including or prioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached its first transition time;triggering a measurement report before or upon the second transition time of the serving cell in an RRC connected state;indicating the preference for the normal mode in the triggered measurement report;suspending, stopping or ignoring measurement report triggering associated with a cell operating in the normal mode until the first transition time of the cell in an RRC connected state;precluding content associated with a cell operating in the normal mode from the measurement report until the first transition time of the cell in an RRC connected state;resuming or applying measurement report triggering associated with a cell operating in the normal mode upon or after the first transition time of the cell in an RRC connected state;including content associated with a cell operating in the normal mode in the measurement report upon or after the first transition time of the cell in an RRC connected state;triggering a radio link failure (RLF) and a re-establishment or a cell reselection before or upon the second transition time of the serving cell in an RRC connected state;triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state;skipping triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state;suspending, stopping or ignoring a conditional handover (CHO) evaluation for a neighbour cell in the case that the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state; orresuming, starting or restarting a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state.The UE of claim 1 or 2, wherein the UE supports the S&F mode or prefers the S&F mode than the normal mode, and the processor is configured to perform the mobility procedure based on the at least one determined S&F mode transition time by at least one of the following:precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the first transition time of the neighbour cell;precluding or deprioritizing a neighbour cell for a cell reselection in an RRC idle state or an RRC inactive state in the case that the neighbour cell has not approached the second transition time of the neighbour cell;including or prioritizing a neighbour cell for a cell reselection including cell ranking in an RRC idle state or an RRC inactive state in the case that the neighbour cell is approaching or has approached the second transition time of the neighbour cell;triggering a measurement report before or upon the first transition time of the serving cell in an RRC connected state;indicating the preference for the S&F mode in the triggered measurement report;suspending, stopping or ignoring measurement report triggering associated with a cell operating in the S&F mode until the second transition time of the cell in an RRC connected state;precluding content associated with a cell operating in the S&F mode from the measurement report until the second transition time of the cell in an RRC connected state;resuming or applying measurement report triggering associated with a cell operating in the S&F mode upon or after the second transition time of the cell in an RRC connected state;including content associated with a cell operating in the S&F mode in the measurement report upon or after the second transition time of the cell in an RRC connected state;triggering an RLF and a re-establishment or a cell reselection before or upon the first transition time of the serving cell in an RRC connected state;triggering a satellite switch with a re-synchronization upon the first transition time of the serving cell in an RRC connected state;skipping triggering a satellite switch with a re-synchronization upon the second transition time of the serving cell in an RRC connected state;suspending, stopping or ignoring a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the first transition time of the neighbour cell in an RRC connected state; orresuming, starting or restarting a CHO evaluation for a neighbour cell in the case that the neighbour cell has approached the second transition time of the neighbour cell in an RRC connected state.The UE of claim 1 or 2, wherein the processor is configured to perform the SI acquiring procedure based on the at least one determined S&F mode transition time by at least one of the following:triggering a system information block (SIB) acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC idle state or an RRC inactive state;triggering a SIB acquiring procedure before or upon the first transition time or the second transition time of the serving cell in an RRC connected state in the case that at least one of the first transition time or the second transition time is before an ephemeris expiry;starting a timer for the SIB acquiring procedure upon triggering the SIB acquiring procedure;stopping a triggered SIB acquiring procedure in an RRC connected state in the case that the second transition time of the serving cell is before the expiry of a timer for the SIB acquiring procedure and the UE does not support the S&F mode or prefers the normal mode than the S&F mode; orstopping a triggered SIB acquiring procedure in an RRC connected state in the case that the first transition time of the serving cell is before the expiry of the timer for the SIB acquiring procedure and the UE supports the S&F mode or prefers the S&F mode than the normal mode.The UE of claim 1 or 2, wherein the processor is configured to perform the AS-NAS interaction procedure based on the at least one determined S&F mode transition time by:indicating the at least one determined S&F mode transition time of the serving cell by a AS of the UE to a NAS of the UE.A first base station comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:receive, via the transceiver from a second base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station; anddetermine at least one of a measurement configuration or a mobility configuration based on the at least one S&F mode transition time of the cell.The first base station of claim 10, wherein at least one of the following:the measurement configuration comprises at least one of a configuration of a measurement object or a configuration of a measurement report; orthe mobility configuration comprises at least one of: a configuration of a conditional handover (CHO) , or a configuration of data forward.The first base station of claim 10 or 11, wherein the processor is configured to receive the at least one S&F mode transition time by at least one of the following:receiving a first indication indicating stop serving time of the cell and a S&F operation indication of the cell;receiving a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time;receiving a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time;receiving a fourth indication indicating the first transition time; orreceiving a sixth indication indicating the second transition time.The first base station of claim 10 or 11, wherein the processor is further configured to:transmit, via the transceiver to the second base station, a request for the at least one S&F mode transition time of the cell; and / orreceive, via the transceiver from the second base station, a request for the at least one S&F mode transition time of a cell provided by the first base station; andtransmit, via the transceiver to the second base station, at least one S&F mode transition time of the cell provided by the first base station.The first base station of claim 10 or 11, wherein the processor is further configured to determine the configuration of the measurement object based on the at least one S&F mode transition time of the cell by at least one of the following:determining at least one measurement object associated with the normal mode for at least one cell measurement based on the at least one S&F mode transition time; ordetermining at least one measurement object associated with the S&F mode for at least one cell measurement based on the at least one S&F mode transition time.The first base station of claim 10 or 11, wherein the processor is further configured to determine the configuration of the measurement report based on the at least one S&F mode transition time of the cell by at least one of the following:determining a triggering condition of a measurement report associated with the second transition time of a cell provided by the first base station based on the at least one S&F mode transition time;determining a triggering condition of a measurement report associated with the first transition time of the cell provided by the first base station based on the at least one S&F mode transition time; ordetermining content of a measurement report including a user equipment (UE) preference for the normal mode or the S&F mode based on the at least one S&F mode transition time.The first base station of claim 10 or 11, wherein the processor is further configured to determine the configuration of the CHO based on the at least one S&F mode transition time of the cell by at least one of the following:determining a CHO condition for a neighbour cell associated with the second transition time of the neighbour cell; ordetermining a CHO condition for a neighbour cell associated with the first transition time of the neighbour cell.The first base station of claim 10 or 11, wherein the processor is further configured to:transmit, to the UE, at least one time indication for one or more S&F mode transition time, wherein the one or more S&F mode transition time comprises at least one of: at least one of S&F mode transition time of the cell, or at least one of S&F mode transition time of the cell at least one of S&F mode transition time of a cell provided by the first base station.A second base station comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:transmit, via the transceiver to a first base station, at least one store and forward (S&F) mode transition time of a cell, wherein the cell is provided by the second base station.The second base station of claim 18, wherein the processor is configured to transmit the at least one S&F mode transition time by at least one of the following:transmitting a first indication indicating stop serving time of the cell and a S&F operation indication of the cell;transmitting a first indication indicating stop serving time of the cell and a second indication indicating that the stop serving time is used as the first transition time;transmitting a first indication indicating stop serving time of the cell and a fifth indication indicating that the stop serving time is used as the second transition time;transmitting a fourth indication indicating the first transition time; ortransmitting a sixth indication indicating the second transition time.The second base station of claim 18 or 19, wherein the processor is further configured to:receive, via the transceiver from the first base station, a request for the at least one S&F mode transition time of the cell; and / ortransmit, via the transceiver to the first base station, a request for the at least one S&F mode transition time of a cell provided by the first base station; andreceive, via the transceiver from the first base station, at least one S&F mode transition time of the cell provided by the first base station.
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