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WO2024147590A1 - Handling power saving in ue during discontinuous coverage of satellite access network - Google Patents

Handling power saving in ue during discontinuous coverage of satellite access network Download PDF

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Publication number
WO2024147590A1
WO2024147590A1 PCT/KR2024/000024 KR2024000024W WO2024147590A1 WO 2024147590 A1 WO2024147590 A1 WO 2024147590A1 KR 2024000024 W KR2024000024 W KR 2024000024W WO 2024147590 A1 WO2024147590 A1 WO 2024147590A1
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WO
WIPO (PCT)
Prior art keywords
unavailability
power saving
coverage
network
amf
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2024/000024
Other languages
French (fr)
Inventor
Lalith KUMAR
Aman Agarwal
Sidhant JAIN
Kailash Kumar Jha
Avneesh Tiwari
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to KR1020257022247A priority Critical patent/KR20250130609A/en
Priority to CN202480006449.0A priority patent/CN120530682A/en
Publication of WO2024147590A1 publication Critical patent/WO2024147590A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0241—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where no transmission is received, e.g. out of range of the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in “Sub 6GHz” bands such as 3.5GHz, but also in “Above 6GHz” bands referred to as mmWave including 28GHz and 39GHz.
  • 6G mobile communication technologies referred to as Beyond 5G systems
  • terahertz bands for example, 95GHz to 3THz bands
  • a user equipment comprising: a transceiver; and at least one processor coupled to the transceiver, configured to: indicate, to an access and mobility management function (AMF), a registration request message including an unavailability type, receive, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type, and perform at least one action during the unavailability period duration.
  • AMF access and mobility management function
  • FIG. 1 shows a block diagram of a satellite access network for satellite communication, according to an embodiment of the disclosure
  • circuits may, for example, be embodied in one or more semiconductor chips, or on substrate supports such as printed circuit boards and the like.
  • circuits constituting a block may be implemented by dedicated hardware, or by a processor (e.g., one or more programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block.
  • a processor e.g., one or more programmed microprocessors and associated circuitry
  • Each block of the embodiments may be physically separated into two or more interacting and discrete blocks without departing from the scope of the disclosure.
  • the blocks of the embodiments may be physically combined into more complex blocks without departing from the scope of the disclosure.
  • Satellite An artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication.
  • Satellite Constellation Group of satellites, placed in orbit round the earth or moon or another planet in order to collect information or for communication.
  • Service User An individual who has received a priority level assignment from a regional/national authority (i.e., an agency authorized to issue priority assignments) and has a subscription to a mobile network operator.
  • a regional/national authority i.e., an agency authorized to issue priority assignments
  • 5GMM sublayer states in the embodiment are at least one of the below:
  • EMM sublayer states are at least one of the below:
  • PLMN selection as per 23.122 without registered PLMN The MS selects and attempts registration on any PLMN/access technology combinations, if available and allowable, in the following order:
  • the at least one action includes determine, by the UE, a time period when the coverage of the satellite access network is available again based on the unavailability period duration.
  • the method includes activating, by the UE, the unavailability period duration when the UE has lost the coverage of the satellite access network. Further, the method includes determining, by the UE, at least one action for the activated unavailability period duration to optimize power saving at the UE until the coverage of the satellite access network is available.
  • the UE (100) may continue to listen to paging during the active timers following MICO and ignore the unreachability timer behaviour. That is, the UE (100) may give Active Timer higher priority over unreachability timer and consider itself reachable until Active Timer is running. However, the network may consider unreachability period for the UE (100) (as higher priority over the active timer) and may consider that the UE (100) is not reachable if unreachability period is running. Network does not page the UE (100) during active time giving priority to unreachability period and considers the UE (100) as unreachable.
  • the UE is in the coverage of satellite access.
  • the UE (100) and the AMF entity (700) may negotiate or determine the PSM/MICO mode parameters and active timer values.
  • the UE (100) enters PSM/MICO mode, and on active timer/T3324 expiry, the UE (100) stops listening to paging.
  • the Network Entity may consider only MICO mode indication IE/T3324 and may ignore the unreachability period(unavailability duration) while determining whether the UE (100) is reachable or not and may provide the indication of the same to the UE (100) that only MICO mode indication IE/T3324 is considered and unreachability period (unavailability duration) is ignored through any AS/NAS signalling message exchange for e.g. in Registration Accept message by including only MICO mode indication IE/T3324.
  • the message name is just shown as an example and could be any message.
  • the UE (100) can also include the indication (indication can be a new information element or some of the existing information elements in NAS or AS message) together with the UE (100) requested active timer value/PSM timer value or the UE (100) requested eDRX value or PTAU value in registration request message/TAU message or any AS or NAS signalling message.
  • indication can be a new information element or some of the existing information elements in NAS or AS message
  • the UE (100) can indicate that the UE (100) is requesting power saving parameters (also referred to as timers/parameters in the embodiment) due to discontinuous coverage by including unreachability period (or unavailability period duration or any name or the UE (100) can be a new dedicated indication indicating the power saving parameters request due to discontinuous coverage or not due to discontinuous coverage).
  • power saving parameters also referred to as timers/parameters in the embodiment
  • the UE (100) enters into NO service or disables (i.e., deactivate) the access stratum when the UE (100) indicates unavailability period duration or the UE (100) indicates Leaving coverage indication to the AMF entity (700) /network.
  • the AMF entity (700) while sending the Active timer, PSM timer or eDRX value or periodic timer value can also include an indication that the values are provided to the UE (100) because the UE (100) is entering discontinuous coverage.
  • the UE (100) is in the coverage of satellite access.
  • the UE (100) sends the registration request to the AMF entity (700).
  • the AMF entity (700) sends the registration accept including the unreachability period accept timer and unreachability period wait timer to the UE (100).
  • the NG-RAN (600) performs the rrcConnection release and indicates the rrcConnection release to the UE (100) at the Unreachability period wait timer.
  • cell coverage is lost due to discontinuous service at the NG-RAN (600).
  • the UE (100) is in the discontinuous coverage.
  • the UE (100) has mo-data to send.
  • the UE (100) determines that 'unreachability period accept timer' is running, so that the UE (100) does not perform cell search.
  • the end time can be an explicit value or it can be determined by start time and duration in seconds.
  • the UE (100) avoids performing / does not perform PLMN search/scan/selection procedure or cell search/scan/selection/reselection procedure for e.g., by getting into no service state or by deactivating the access stratum when timer is running (i.e. the UE (100) considers this as a discontinuous coverage period). At the expiry or stop of the timer or time duration, the UE (100) again starts performing PLMN/cell search/selection/re-selection procedure.
  • the UE (100) again starts performing PLMN/cell search/selection/re-selection procedure.
  • the network entity/network function e.g., AMF entity (700) can provide a timer value (for e.g., unreachability period wait timer or any other name) after which the UE (100) enters Discontinuous coverage with the earlier mentioned timer value (for e.g., unreachability period accept timer or the unreachability period accept timer can be any name).
  • the UE (100) is aware that when the UE (100) applies power saving or till when the UE (100) has to send/receive data. In other words, the UE (100) knows when the discontinuous coverage starts, by taking this into consideration.
  • the UE (100) uses power saving while initiating a NAS procedure, with sufficient time to complete the NAS procedure before the start of the unreachability period.
  • the UE (100) enters into discontinuous service (Unreachability Period), optionally once unreachability period timer (or any timer name which is used to track unreachability or unavailability period) has started and has no service as the NTN cell coverage is lost. In an embodiment of the disclosure, the UE (100) can determine that coverage has lost i.e.
  • the UE (100) enters in NO SERVICE (NO-CELL-AVAILABLE) state or any of the 5GMM sublayer states or EMM sublayer states, optionally by deactivating the access stratum, because of discontinuous coverage, optionally due to at least one of the broadcast information from RAN node like gNodeB or eNodeB or receiving signalling message from the 5GC (500) or from application server or any other mechanism.
  • NO SERVICE NO-CELL-AVAILABLE
  • EMM sublayer states optionally by deactivating the access stratum, because of discontinuous coverage, optionally due to at least one of the broadcast information from RAN node like gNodeB or eNodeB or receiving signalling message from the 5GC (500) or from application server or any other mechanism.
  • the UE (100) stays in discontinuous coverage for the determined discontinuous coverage period and waits for the UE (100) to return to coverage.
  • the UE (100) needs to connect to cell for uplink communication.
  • the UE (100) determines 'unreachability period accept timer' or unavailability period duration accept timer (or any names) is running, so that the UE (100) does not perform PLMN/Cell Scan/Search/selection/re-selection procedure.
  • the UE (100) may perform PLMN/Cell Scan/Search/selection/re-selection procedure.
  • the UE (100) changes the mobility pattern/trajectory for e.g., stationary to non-stationary or non-stationary to stationary, or based on GPS location and NTN cell ephemeris or based on change of direction of the UE (100) movement or the UE (100) based on implementation determines that the UE (100) can get the service, then the UE (100) stops the unreachability period accept timer/time duration and start doing PLMN search/scan/selection procedure or Cell search/scan/selection/reselection procedure. Since the UE (100) direction/position has changed, the discontinuous service information is no longer applicable, and the UE (100) may find cell coverage on performing cell search.
  • the satellite access network (1000) includes the UE (100) and the network apparatus (900).
  • the UE (100) can be, for example, but not limited to a laptop, a smart phone, a desktop computer, a notebook, a Device-to-Device (D2D) device, a vehicle to everything (V2X) device, a foldable phone, a smart TV, a tablet, an immersive device, and an internet of things (IoT) device.
  • the network apparatus (900) can be, for example, but not limited to the AMF device, the MME or the like.
  • the UE (100) transmits a registration request message to the network apparatus (900) in the satellite access network (1000) when the UE (100) is in coverage of the satellite access network (1000).
  • the registration request message includes at least one of the unavailability type, the unavailability parameter and the power saving parameter.
  • the unavailability type indicates a cause of unavailability as discontinuous coverage, due to the NR satellite access discontinuous coverage. If it set to not due to NR satellite access discontinuous coverage then, the network will set appropriate power saving parameters based on its determination that the UE (100) is entering unavailability not due to NR satellite access discontinuous coverage.
  • the UE (100) receives the registration accept message from the Network apparatus (900).
  • the registration accept message includes the power saving parameter and the unavailability period duration determined by the network apparatus (900), based on indication of the unavailability type and the unavailability parameter.
  • the UE (100) detects that the UE (100) has lost the coverage of the satellite access network (1000). Further, the UE (100) activates the unavailability period duration when the UE (100) has lost the coverage of the satellite access network (1000). Further, the UE (100) determines an action for the activated unavailability period duration to optimize power saving at the UE (100) until the coverage of the satellite access network (1000) is available.
  • the action includes configure the UE (100) into a 5GMM-REGISTERED.NO-CELL-AVAILABLE state.
  • the action includes deactivate the AS function for the NR satellite access in the satellite access network (1000) for the unavailability period duration.
  • the action includes determine the time period when the coverage of the satellite access network (1000) is available again based on the unavailability period duration.
  • the UE (100) receives the optimal power saving parameter when requested by the UE (100) in the registration request message.
  • the optimal power saving parameter indicates at least one of the periodic registration timer, the extended DRX in CM-IDLE configuration, the MICO mode configuration, and the NG-RAN (600) with extended connected time, the unavailability period parameter like unavailability period etc. Based on the received power saving parameter, the UE (100) performs the power saving.
  • the UE (100) shuts down its access stratum and does not perform any search based on unavailability period indicated by the network apparatus (900) to conserve the power during discontinuous coverage.
  • the UE (100) explicitly indicates the unavailability type to the network apparatus (900) based on the indication and determination from the UE (100) the UE (100) sets the response unavailability period and power saving parameters.
  • the UE (100) indicates the unavailability type to indicate the reason, the UE (100) is entering the unavailability to the network, based on this value network determines the power saving parameters (e.g. periodic registration timer value, eDRX, MICO, unavailability period duration) and unavailability parameters (e.g. unavailability duration).
  • the unavailability type value can be, UE is entering unavailability due to NR satellite access discontinuous coverage or it can be set to not due to NR satellite access discontinuous coverage.
  • FIG. 7 shows various hardware components of the UE (100) according to an embodiment of the disclosure.
  • the UE (100) includes a processor (110), a communicator (120), a memory (130) and a satellite discontinuous coverage controller (140).
  • the processor (110) is coupled with the communicator (120), the memory (130) and the satellite discontinuous coverage controller (140).
  • the satellite discontinuous coverage controller (140) transmits the registration request message to the network apparatus (900) in the satellite access network (1000) when the UE (100) is in coverage of the satellite access network (1000).
  • the registration request message includes the unavailability type, the unavailability parameter and the power saving parameter.
  • the satellite discontinuous coverage controller (140) receives the registration accept message from the network apparatus (900).
  • the registration accept message includes the power saving parameter and the unavailability period duration determined by the Network apparatus (900), based on indication of the unavailability type and the unavailability parameter.
  • the satellite discontinuous coverage controller (140) detects that the UE (100) has lost the coverage of the satellite access network (1000).
  • non-transitory may indicate that the storage medium is not embodied in a carrier wave or a propagated signal. However, the term “non-transitory” should not be interpreted that the memory (130) is non-movable. In certain examples, a non-transitory storage medium may store data that can, over time, change (e.g., in Random Access Memory (RAM) or cache).
  • RAM Random Access Memory
  • the communicator (120) includes an electronic circuit specific to a standard that enables wired or wireless communication.
  • the communicator (120) is configured to communicate internally between internal hardware components of the UE (100) and with external devices via one or more networks.
  • the satellite discontinuous coverage controller (940) is implemented by analog and/or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and may optionally be driven by firmware.
  • the processor (910) obtains a registration request message including an unavailability type, determines an unavailability period duration based on the unavailability type, and transmits, to a user equipment (UE), a registration accept message including the unavailability period duration.
  • UE user equipment
  • the processor (910) determines a power saving parameter based on the unavailability period duration when the power saving parameter is requested from the UE.
  • FIG. 9 is a flow chart (S900) illustrating a method, implemented by the UE (100), for handling power saving in the UE (100) during discontinuous coverage of the satellite access network (1000), according to an embodiment of the disclosure.
  • the operations (S902-S910) are handled by the satellite discontinuous coverage controller (140).
  • the action includes configuring the UE (100) into the 5GMM-REGISTERED.NO-CELL-AVAILABLE state.
  • the action includes deactivate the AS function for the NR satellite access in the satellite access network (1000) for the unavailability period duration.
  • the action includes determine the time period when the coverage of the satellite access network (1000) is available again based on the unavailability period duration.
  • a method performed by a user equipment comprises entering 5GMM-REGISTERED.NO-CELL-AVAILABLE; deactivating an access stratum; and determining when to return to coverage.
  • the power saving parameter comprises at least one of a periodic registration update timer, an extended discontinuous reception (DRX) in CM-IDLE configuration, a mobile initiated communication only (MICO) mode configuration, and a next generation radio access network (NG-RAN) with extended connected time.
  • the registration request message comprises at least one of a MICO indication, a requested active time, and a requested DRX parameter.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A user equipment (UE) indicates, to an access and mobility management function (AMF), a registration request message including an unavailability type, receives, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type, and performs at least one action during the unavailability period duration.

Description

HANDLING POWER SAVING IN UE DURING DISCONTINUOUS COVERAGE OF SATELLITE ACCESS NETWORK
The embodiments disclosed herein generally relate to the field of a satellite access network, and more particularly to a method and a satellite access network for handling power saving in a User Equipment (UE) during discontinuous coverage of the satellite access network.
5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.
At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.
Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.
Moreover, there has been ongoing standardization in air interface architecture/protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture/service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.
As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.
Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.
In a first aspect of the disclosure, provided herein is a method performed by a user equipment (UE), the method comprising: indicating, to an access and mobility management function (AMF), a registration request message including an unavailability type; receiving, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type; and performing at least one action during the unavailability period duration.
In a second aspect of the disclosure, provided herein a user equipment (UE) comprising: a transceiver; and at least one processor coupled to the transceiver, configured to: indicate, to an access and mobility management function (AMF), a registration request message including an unavailability type, receive, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type, and perform at least one action during the unavailability period duration.
In a third aspect of the disclosure, provided herein an access and mobility management function (AMF) comprising: a transceiver; and at least one processor coupled to the transceiver, configured to: obtain a registration request message including an unavailability type, determine an unavailability period duration based on the unavailability type, and transmit, to a user equipment (UE), a registration accept message including the unavailability period duration.
The method and the satellite access network are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
FIG. 1 shows a block diagram of a satellite access network for satellite communication, according to an embodiment of the disclosure;
FIG. 2 shows a sequence diagram illustrating a UE and a network that are out of sync leading to paging miss/missed services to the UE, according to an embodiment of the disclosure;
FIG. 3 shows a sequence diagram of the UE performing a cell search, according to an embodiment of the disclosure;
FIG. 4 shows a sequence diagram of the UE and an AMF entity for handling power saving in the UE during discontinuous coverage of the satellite access network, according to an embodiment of the disclosure;
FIG. 5 shows a sequence diagram of the UE determining that unreachability period accept timer is running, according to an embodiment of the disclosure;
FIG. 6 illustrates a block diagram of a satellite access network for handling power saving in the UE during discontinuous coverage of the satellite access network, according to an embodiment of the disclosure;
FIG. 7 shows various hardware components of the UE, according to an embodiment of the disclosure;
FIG. 8 shows various hardware components of a network apparatus, according to an embodiment of the disclosure;
FIG. 9 is a flow chart illustrating a method, implemented by the UE, for handling power saving in the UE during discontinuous coverage of the satellite access network, according to an embodiment of the disclosure; and
FIG. 10 is a flow chart illustrating a method, implemented by the network apparatus, for handling power saving in the UE during discontinuous coverage of the satellite access network, according to an embodiment of the disclosure.
It may be noted that to the extent possible, like reference numerals have been used to represent like elements in the drawing. Further, those of ordinary skill in the art will appreciate that elements in the drawing are illustrated for simplicity and may not have been necessarily drawn to scale. For example, the dimension of some of the elements in the drawing may be exaggerated relative to other elements to help to improve the understanding of aspects of the invention. Furthermore, the one or more elements may have been represented in the drawing by conventional symbols, and the drawings may show only those specific details that are pertinent to the understanding the embodiments of the invention so as not to obscure the drawing with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.
Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. In the following description, specific details such as detailed configuration and components are merely provided to assist the overall understanding of these embodiments of the disclosure. Therefore, it should be apparent to those skilled in the art that various changes and modifications of the embodiments described herein can be made without departing from the scope of the present disclosure. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
Also, the embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments.
Herein, the term "or" as used herein, refers to a non-exclusive or, unless otherwise indicated. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those skilled in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
As is traditional in the field, embodiments may be described and illustrated in terms of blocks which carry out a described function or functions. These blocks, which may be referred to herein as managers, units, modules, hardware components or the like, are physically implemented by analog and/or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and may optionally be driven by firmware and software. The circuits may, for example, be embodied in one or more semiconductor chips, or on substrate supports such as printed circuit boards and the like. The circuits constituting a block may be implemented by dedicated hardware, or by a processor (e.g., one or more programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block. Each block of the embodiments may be physically separated into two or more interacting and discrete blocks without departing from the scope of the disclosure. Likewise, the blocks of the embodiments may be physically combined into more complex blocks without departing from the scope of the disclosure.
The 5G system supports service continuity between New Radio (NR) terrestrial access network and NR satellite access networks owned by the same operator or owned by 2 different operators having an agreement. The Non-Terrestrial Networks (NTN) and Terrestrial Network (TN) could either operate in two different frequency bands (e.g., FR1 vs FR2), or in same frequency band (e.g., FR1 or FR2). The terms Satellite 3GPP access, Satellite access, Satellite Access Network, NR Satellite Access Network, Satellite Next Generation Radio Access Network (NG-RAN) Access Technology and NR Satellite access have been interchangeably used and have the same meaning. The methods, issues or solutions disclosed in an embodiment are explained using NR satellite access or Satellite NG-RAN Access Technology as an example and is not restricted or limited to NR Satellite access only. However, the solutions proposed in the embodiment are also applicable for Satellite Evolved Universal Mobile Telecommunication Access Network (E-UTRAN) access Technology, NB (Narrow Band)-S1 mode or WB (Wide Band)-S1 mode via satellite E-UTRAN access and/or NB-IOT (Narrow Band Internet Of Things) or WB-IOT (Wide Band Internet Of Things) Satellite Access/Architecture. The solutions which are defined for NR (5GC) are also applicable to legacy Radio Access Technology (RAT) like E-UTRA/LTE, the corresponding CN entities needs to be replaced by Long Term Evolution (LTE) entities for e.g., Access and Mobility Management Function entity (AMF entity) with Mobility Management Entity (MME), Next generation Node-B (gnodeB) with evolved-nodeB (e-nodeB), UDM with HSS etc. But principles of the solution remain same. An example list of NAS messages can be, but not limited to, REGISTRATION REQUEST message; DEREGISTRATION REQUEST message; SERVICE REQUEST message; CONTROL PLANE SERVICE REQUEST; IDENTITY REQUEST; AUTHENTICATION REQUEST; AUTHENTICATION RESULT; AUTHENTICATION REJECT; REGISTRATION REJECT; DEREGISTRATION ACCEPT; SERVICE REJECT; SERVICE ACCEPT, and so on.
The network used in the embodiment is explained using any 5G Core Network Function for e.g., AMF entity. However, the network could be any 5G/EUTRAN Core Network Entities like AMF entity /SMF entity / MME /UPF entity or the Network could be any 5G/EUTRAN RAN Entity like eNodeB (eNB) or gNodeB (gNB) or NG-RAN etc. The messages used or indicated in the embodiment are shown as an example. The messages could be any signalling messages between the UE and the Network Functions/Entities or between different Network functions/entities. The term area/location/geographical area are used in the embodiment may refer to any of cell/cell ID, Tracking Are Code (TAC)/ Tracking Are Identity (TAI), Public Land Mobile Network (PLMN), Mobile Country Code (MCC)/ Mobile Network Code (MNC), Latitude/longitude, CAG cell or any geographical location/coordinate.
Below are the abbreviations used in the patent disclosure:
1. NTN - Non-Terrestrial Networks
2. TER: Terrestrial
3. SAT: Satellite
4. TN - Terrestrial Network
5. UE - User Equipment
6. eNB - Evolved Node-B
7. gNB - Next generation Node-B
8. EPC - Evolved Packet Core
9. 5GC - 5G Core
10. DC - Discontinuous Coverage
11. NW - Network
12. E-UTRA - Evolved Universal Mobile Telecommunication Access
13. NG-RAN - Next Generation Radio Access Network
14. EUTRAN - Evolved Universal Mobile Telecommunication Access Network
15. HPLMN - Home Public Land Mobile Network
16. 3GPP - Third Generation Partnership Project
17. Uu - The radio interface between the UE and the Node B
18. TAU - Tracking Area Update
19. RAT - Radio Access Technology
20. OOS - Out of Service
21. AMF entity - Access and Mobility Management Function entity
22. MME - Mobility Management Entity
23. GPS - Global Positioning System
24. DRX - Discontinuous Reception
25. eDRX - Extended Discontinuous Reception
26. DL - Downlink
27. UL - Uplink
28. QoS - Quality Of Service
29. ARP - Allocation and Retention Policy
30. MICO - Mobile Initiated Communication Only
31. MCS - Mission Critical Service
32. MPS - Multimedia Priority Service
33. ME- Mobile Equipment
34. USIM - Universal Subscriber Identification Module
35. Uu - The radio interface between the UE and the Node B
36. PLMN - Public Land Mobile Network
37. FR - Frequency Range
38. AS - Access Stratum
39. NAS - Non-Access Stratum
40. Satellite: An artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication.
41. Satellite Constellation: Group of satellites, placed in orbit round the earth or moon or another planet in order to collect information or for communication.
42. Service User: An individual who has received a priority level assignment from a regional/national authority (i.e., an agency authorized to issue priority assignments) and has a subscription to a mobile network operator.
43. OS Upgrade: Operating System Upgrade
44. SW: Software
45. PSM: Power Saving Mode
The term 5GMM sublayer states in the embodiment are at least one of the below:
1) 5GMM-NULL
2) 5GMM-DEREGISTERED
a) 5GMM-DEREGISTERED.NORMAL-SERVICE
b) 5GMM-DEREGISTERED.LIMITED-SERVICE
c) 5GMM-DEREGISTERED.ATTEMPTING-REGISTRATION
d) 5GMM-DEREGISTERED.PLMN-SEARCH
e) 5GMM-DEREGISTERED.NO-SUPI
f) 5GMM-DEREGISTERED.NO-CELL-AVAILABLE
g) 5GMM-DEREGISTERED.eCALL-INACTIVE
h) 5GMM-DEREGISTERED.INITIAL-REGISTRATION-NEEDED
3) 5GMM-REGISTERED-INITIATED
4) 5GMM-REGISTERED
a) 5GMM-REGISTERED.NORMAL-SERVICE
b) 5GMM-REGISTERED.NON-ALLOWED-SERVICE
c) 5GMM-REGISTERED.ATTEMPTING-REGISTRATION-UPDATE
d) 5GMM-REGISTERED.LIMITED-SERVICE
e) 5GMM-REGISTERED.PLMN-SEARCH
f) 5GMM-REGISTERED.NO-CELL-AVAILABLE
g) 5GMM-REGISTERED.UPDATE-NEEDED
5) 5GMM-DEREGISTERED-INITIATED
6) 5GMM-SERVICE-REQUEST-INITIATED.
In an embodiment of the disclosure, the term EPS Mobility Management (EMM) sublayer states are at least one of the below:
1) EMM-NULL
2) EMM-DEREGISTERED
a) EMM-DEREGISTERED.NORMAL-SERVICE
b) EMM-DEREGISTERED.LIMITED-SERVICE
c) EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH
d) EMM-DEREGISTERED.PLMN-SEARCH
e) EMM-DEREGISTERED.NO-IMSI
f) EMM-DEREGISTERED.ATTACH-NEEDED
g) EMM-DEREGISTERED.NO-CELL-AVAILABLE
h) EMM-DEREGISTERED.eCALL-INACTIVE
3) EMM-REGISTERED-INITIATED
4) EMM-REGISTERED
a) EMM-REGISTERED.NORMAL-SERVICE
b) EMM-REGISTERED.ATTEMPTING-TO-UPDATE
c) EMM-REGISTERED.LIMITED-SERVICE
d) EMM-REGISTERED.PLMN-SEARCH
e) EMM-REGISTERED.UPDATE-NEEDED
f) EMM-REGISTERED.NO-CELL-AVAILABLE
g) EMM-REGISTERED.ATTEMPTING-TO-UPDATE-MM
h) EMM-REGISTERED.IMSI-DETACH-INITIATED
5) EMM-DEREGISTERED-INITIATED
6) EMM-TRACKING-AREA-UPDATING-INITIATED
7) EMM-SERVICE-REQUEST-INITIATED
The term RAT as defined in the embodiment can be one of the following:
(1) NG-RAN
(2) 5G, 4G, 3G, 2G
(3)EPS, 5GS
(4)NR
(5)NR in unlicensed bands
(6)NR(LEO) satellite access
(7)NR(MEO) satellite access
(8)NR(GEO) satellite access
(9)NR(OTHERSAT) satellite access
(10)NR RedCap
(11)E-UTRA
(12)E-UTRA in unlicensed bands
(13)NB-IoT
(14)WB-IoT
(15)LTE-M
PLMN selection as per 23.122 without registered PLMN (RPLMN): The MS selects and attempts registration on any PLMN/access technology combinations, if available and allowable, in the following order:
1. Either the HPLMN (if the EHPLMN list is not present or is empty) or the highest priority EHPLMN that is available (if the EHPLMN list is present);
2. Each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology" data file in the Subscriber Identification Module (SIM) (in priority order);
3. Each PLMN/access technology combination in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) or stored in the ME (in priority order);
4. Other PLMN/access technology combinations with received high quality signal in random order;
5. Other PLMN/access technology combinations in order of decreasing signal quality.
PLMN selection as per 23.122 with RPLMN: The Mobile Station (MS) selects and attempts registration on any PLMN/access technology combinations, if available and allowable, in the following order:
1. Either the RPLMN or the Last registered PLMN;
2. Either the HPLMN (if the Equivalent HPLMN (EHPLMN) list is not present or is empty) or the highest priority EHPLMN that is available (if the EHPLMN list is present);
3. Each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order);
4. Each PLMN/access technology combination in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) or stored in the ME (in priority order);
5. Other PLMN/access technology combinations with received high quality signal in random order;
6. Other PLMN/access technology combinations in order of decreasing signal quality.
In general, 3GPP specification requires a UE in discontinuous coverage of a satellite scenario. The UE may have coverage at only specific times and places due to a continuous movement of the satellites or satellite constellations. Due to the discontinuous coverage, the UE may have access to satellite service coverage only at specific time and places. In the discontinuous coverage of the satellite scenario, the UEs are bound to have coverage at only specific times due to the continuous movement of the satellites or satellite constellations. The UE may determine to leave network coverage based on coverage information or any other information, e.g., satellite ephemeris, while in either CONNECTED or IDLE mode. When the UEs are about to get the satellite coverage after specific time, the UE may initiate signalling towards the network due to any UL Traffic or NAS layer signalling. Similarly, if the network has buffered any downlink data, the network may page the UE on determining that the UE is back in coverage. The network also triggers any DL signalling if the network determines that the UE is back in coverage. Few of the power saving mechanisms/timers/parameters, but not restricted or limited to only these, are Active time / MICO mode with Active Time, Extended Connected Time/ MICO mode with Extended Connected time, Periodic TAU Timer / Periodic Update Timer, Periodic Registration Timer / Periodic Registration Update Timer and eDRX parameters (such as cycle length).
For a Fifth Generation (5G) system with the satellite access, the following requirements apply. In satellite communication, due to moving nature of cells expected to have gap durations where a specific location cannot be served by the satellite due to the satellite moving away from that location before another satellite starts covering that area. Since the ephemeris of the satellite is known beforehand, the duration when the specific location will be out of satellite coverage can be calculated. Also, the UE, at that location, will not be able to perform communication with the satellite during the gap period/unavailability duration. Considering the above points, a concept of unavailability period timer (or unavailability duration or any similar name) is introduced, during which the UE is out of satellite cell coverage. During the period, the UE may choose to apply power saving measures etc.
Further, the UE can enter into unavailability due to multiple reasons (events) for e.g. if the UE has to do software upgrades or OS upgrades or apply security patches. Another reason can be because the UE is entering into the discontinuous coverage. In an example, the OS upgrade may take 2 mins, but discontinuous coverage may take 3 hours. Currently network has no mechanism to differentiate the reason why unavailability is indicated by the UE, thus the network may set wrong power saving parameters into the UE based on its knowledge of unavailability which may differ due to different reasons. In an example, if the UE is getting into unavailability of 3 mins due to OS upgrade and indicates unavailability for power saving, the network may consider the UE is getting unavailable due to discontinuous coverage and set the power saving parameters for 4 hours. Thus parameters given to the UE may be wrong and can have wrong implications on the UE and the network.
Further, the UE is in the discontinuous coverage and if the UE wants to send mo-data/mo-signalling to the network for such a case it needs to connect to cell to for uplink communication. The UE will keep searching for the network to find service and to perform mo-data transfer/mo-signalling. However, since the UE is in discontinuous service, it will not find satellite access but the UE will keep searching for the network. This will lead to unnecessary consumption of battery at the UE.
It is desirable to solve above problems or at least provide some alternative ways of handling such problems related to discontinuous coverage.
The principal object of the embodiments herein is to provide a method and a satellite access network for handling power saving in a UE during discontinuous coverage of the satellite access network.
Another object of the embodiments herein is to transmit a registration request message to a network apparatus in the satellite access network when the UE is in coverage of the satellite access network, where the registration request message includes an unavailability type, an unavailability parameter and a power saving parameter.
Another object of the embodiments herein is to receive a registration accept message from the network apparatus, where the registration accept message includes the power saving parameter and an unavailability period duration determined by the network apparatus, based on indication of the unavailability type and the unavailability parameter.
Another object of the embodiments herein is to activate the unavailability period duration when the UE has lost the coverage of the satellite access network.
Another object of the embodiments herein is to determine an action for the activated unavailability period duration to optimize power saving at the UE until the coverage of the satellite access network is available.
Another object of the embodiments herein is to receive an optimal power saving parameter when requested by the UE in the registration request message.
Another object of the embodiments herein is to perform the power saving based on the received power saving parameter.
Embodiments disclosed herein provide a method for handling power saving in a UE during discontinuous coverage of a satellite access network. The method includes transmitting, by the UE, a registration request message to a network apparatus in the satellite access network when the UE is in coverage of the satellite access network. The registration request message includes an unavailability type, an unavailability parameter and a power saving parameter. Further, the method includes receiving, by the UE, a registration accept message from the network apparatus. The registration accept message includes at least one of the power saving parameter and an unavailability period duration determined by the network apparatus, based on indication of the unavailability type and the unavailability parameter. Further, the method includes detecting, by the UE, that the UE has lost the coverage of the satellite access network. Further, the method includes activating, by the UE, the unavailability period duration when the UE has lost the coverage of the satellite access network. Further, the method includes determining, by the UE, at least one action for the activated unavailability period duration to optimize power saving at the UE until the coverage of the satellite access network is available.
In an embodiment of the disclosure, the at least one action includes configuring the UE into a 5GMM-REGISTERED.NO-CELL-AVAILABLE state.
In an embodiment of the disclosure, the at least one action includes deactivating, by the UE, an access stratum (AS) function for a new radio (NR) satellite access in the satellite access network for the unavailability period duration.
In an embodiment of the disclosure, the at least one action includes determine, by the UE, a time period when the coverage of the satellite access network is available again based on the unavailability period duration.
In an embodiment of the disclosure, the unavailability type indicates a cause of unavailability as discontinuous coverage, due to a NR satellite access discontinuous coverage, if it set to not due to NR satellite access discontinuous coverage then network will set appropriate power saving parameters based on its determination that the UE is entering unavailability not due to NR satellite access discontinuous coverage.
In an embodiment of the disclosure, the unavailability parameter includes a start of an unavailability period when known to the UE and the unavailability period duration when known to the UE.
In an embodiment of the disclosure, the method includes receiving, by the UE, an optimal power saving parameter when requested by the UE in the registration request message. Further, the method includes performing, by the UE, the power saving based on the received power saving parameter.
In an embodiment of the disclosure, the optimal power saving parameter indicates at least one of a periodic registration timer, an extended DRX in CM-IDLE configuration, a MICO mode configuration, and a Next Generation Radio Access Network (NG-RAN) with extended connected time.
Embodiments disclosed herein provide a method for handling power saving in a UE during discontinuous coverage of a satellite access network. The method includes receiving, by a network apparatus, a registration request message from the UE when the UE is in coverage of the satellite access network. The registration request message includes at least one of the unavailability type, an unavailability parameter and a power saving parameter. Further, the method includes determining, by the network apparatus, an unavailability period duration and the power saving parameter when requested by the UE based on indication of the unavailability type and the unavailability parameter. Further, the method includes transmitting, by the network apparatus, a registration accept message to the UE to optimize power consumption at the UE during the discontinuous coverage of the satellite access network. The registration accept message includes the unavailability period duration and optimal power saving parameters.
Embodiments disclosed herein provide a UE for handling power saving in the UE during discontinuous coverage of a satellite access network. The UE includes a satellite discontinuous coverage controller coupled to a memory and a processor. The satellite discontinuous coverage controller is configured to transmit a registration request message to a network apparatus in the satellite access network when the UE is in coverage of the satellite access network. The registration request message includes an unavailability type, an unavailability parameter and a power saving parameter. Further, the satellite discontinuous coverage controller is configured to receive a registration accept message from the network apparatus. The registration accept message includes the power saving parameter and an unavailability period duration determined by the network apparatus, based on indication of the unavailability type and the unavailability parameter. Further, the satellite discontinuous coverage controller is configured to detect that the UE has lost the coverage of the satellite access network. Further, the satellite discontinuous coverage controller is configured to activate the unavailability period duration when the UE has lost the coverage of the satellite access network. Further, the satellite discontinuous coverage controller is configured to determine at least one action for the activated unavailability period duration to optimize power saving at the UE until the coverage of the satellite access network is available.
Embodiments disclosed herein provide a network apparatus for handling power saving in a UE during discontinuous coverage of a satellite access network. The network apparatus includes a satellite discontinuous coverage controller coupled to a memory and a processor. The satellite discontinuous coverage controller is configured to receive a registration request message from the UE when the UE is in coverage of the satellite access network. The registration request message includes an unavailability type, an unavailability parameter and a power saving parameter. Further, the satellite discontinuous coverage controller is configured to determine an unavailability period duration and the power saving parameter when requested by the UE based on indication of the unavailability type and the unavailability parameter. Further, the satellite discontinuous coverage controller is configured to transmit a registration accept message to the UE to optimize power consumption at the UE during the discontinuous coverage of the satellite access network. The registration accept message includes the unavailability period duration and optimal power saving parameters.
These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the scope thereof, and the embodiments herein include all such modifications.
Embodiments disclosed herein provide a method for handling power saving in a UE during discontinuous coverage of a satellite access network. The method includes transmitting, by the UE, a registration request message to a network apparatus in the satellite access network when the UE is in coverage of the satellite access network. The registration request message includes an unavailability type, an unavailability parameter and a power saving parameter. Further, the method includes receiving, by the UE, a registration accept message from the network apparatus. The registration accept message includes the power saving parameter and an unavailability period duration determined by the network apparatus, based on at least one of the indication of the unavailability type and the unavailability parameter. Further, the method includes detecting, by the UE, that the UE has lost the coverage of the satellite access network. Further, the method includes activating, by the UE, the unavailability period duration when the UE has lost the coverage of the satellite access network. Further, the method includes determining, by the UE, at least one action for the activated unavailability period duration to optimize power saving at the UE until the coverage of the satellite access network is available.
In an embodiment of the disclosure, the at least one action comprises at least one of: configuring the UE into a 5GMM-REGISTERED.NO-CELL-AVAILABLE state; deactivating, by the UE, an access stratum (AS) function for a new radio (NR) satellite access in the satellite access network for the unavailability period duration; and determining, by the UE, a time period when the coverage of the satellite access network is available again based on the unavailability period duration.
In an embodiment of the disclosure, the unavailability type indicates a cause of unavailability as discontinuous coverage, due to a NR satellite access discontinuous coverage. In an embodiment of the disclosure, the unavailability parameter comprises a start of an unavailability period when known to the UE and the unavailability period duration when known to the UE.
In an embodiment of the disclosure, the method comprises receiving, by the UE, an optimal power saving parameter when requested by the UE in the registration request message; and performing, by the UE, the power saving based on the received power saving parameter. In an embodiment of the disclosure, the optimal power saving parameter indicates at least one of a periodic registration timer, an extended Discontinuous Reception (DRX) in CM-IDLE configuration, a Mobile Initiated Communication Only (MICO) mode configuration, and a Next Generation Radio Access Network (NG-RAN) with extended connected time.
In an embodiment of the disclosure, a method for handling power saving in a UE during discontinous coverage of a satellite access network, comprising: receiving, by a network apparatus, a registration request message from the UE when the UE is in coverage of the satellite access network, wherein the registration request message comprises an unavailability type, an unavailability parameter and a power saving parameter; determining, by the network apparatus, an unavailability period duration and the power saving parameter when requested by the UE based on indication of the unavailability type and the unavailability parameter; and transmitting, by the network apparatus, a registration accept message to the UE to optimize power consumption at the UE during the discontinous coverage of the satellite access network, wherein the registration accept message comprises the unavailability period duration and optimal power saving parameters.
In an embodiment of the disclosure, a UE for handling power saving in the UE during discontinuous coverage of a satellite access network, comprising: a memory; a processor; and a satellite discontinuous coverage controller, coupled to the memory and the processor, configured to: transmit a registration request message to a network apparatus in the satellite access network when the UE is in coverage of the satellite access network, wherein the registration request message includes an unavailability type, an unavailability parameter and a power saving parameter; receive a registration accept message from the network apparatus, wherein the registration accept message comprises the power saving parameter and an unavailability period duration determined by the network apparatus, based on indication of the unavailability type and the unavailability parameter; detect that the UE has lost the coverage of the satellite access network; activate the unavailability period duration when the UE (100) has lost the coverage of the satellite access network; and determine at least one action for the activated unavailability period duration to optimize power saving at the UE until the coverage of the satellite access network is available.
In an embodiment of the disclosure, a network apparatus for handling power saving in a UE during discontinuous coverage of a satellite access network, comprising: a memory; a processor; and a satellite discontinuous coverage controller, coupled to the memory and the processor, configured to: receive a registration request message from the UE when the UE is in coverage of the satellite access network, wherein the registration request message comprises an unavailability type, an unavailability parameter and a power saving parameter; determine an unavailability period duration and the power saving parameter when requested by the UE based on indication of the unavailability type and the unavailability parameter; and transmit a registration accept message to the UE to optimize power consumption at the UE during the discontinuous coverage of the satellite access network, wherein the registration accept message comprises the unavailability period duration and optimal power saving parameters.
Based on the proposed method, the UE shuts down its access stratum and does not perform any search based on unavailability period indicated by the network apparatus to conserve the power during discontinuous coverage. The UE explicitly indicates the unavailability type to the network apparatus based on the indication and determination from the UE, the UE sets the response unavailability period and power saving parameters.
Based on the proposed method, the UE indicates to the network or any Network function or entity (for e.g., AMF entity /MME) the unreachability period (unavailability duration or any name) in a NAS or AS signalling message e.g., Registration Request message. The UE may also indicate an active timer or MICO mode indication IE/T3324 to the network or any network function or entity (for e.g., AMF entity /MME) in a NAS or AS signalling message e.g., Registration Request message. The message name is just shown as an example and could be any message. The AMF entity, optionally, replies the negotiated unreachability period to the UE in any NAS or AS signalling message for e.g., Registration Accept message. The AMF entity, optionally, replies the negotiated Active Timer value or MICO mode indication IE/T3324 to the UE in any NAS or AS signalling message for e.g., Registration Accept message. The AMF entity may use the negotiated information to determine when the UE is reachable and when the UE is not reachable.
In an embodiment, an unreachability period timer is started after the active timer expires. The UE and AMF entity /MME may optionally negotiate and are configured with Unreachability Period Timer and Active Timer (T3324). The UE and AMF entity /MME may decide to run Active Timer (T3324) first and after the Active Timer expires, the UE and AMF entity run Unreachability Period Timer. The Active Timer and/or the unreachability timer may have any of the value indicated by the UE or the value provided by the Network Entity (for e.g., AMF entity). The UE is available for paging/Network may page the UE during the active timer, after expiry of which the UE and AMF entity start the unreachability period timer. During the unreachability period timer, the UE is considered as unreachable and the AMF entity does not page the UE and the UE will not listen to paging.
Referring now to the drawings and more particularly to FIGS. 1 through 10, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
FIG. 1 shows a block diagram of a satellite access network (1000) for satellite communication, according to an embodiment of the disclosure. In an embodiment of the disclosure, the satellite access network (1000) includes a UE (100), a satellite (200), a gateway (300), an eNB/gNB (400) and an EPC/5GC (500). The UE (100), the satellite (200), the gateway (300), the eNB/gNB (400) and the EPC/5GC (500) communicate with each other. FIG.1 shows a continuous satellite coverage. In NTN, the continuous satellite coverage can be characterized by the fact that Uu interface is available for the UE (100) at a given position for 100% of the time.
Discontinuous Coverage (DC): In NTN, Discontinuous satellite coverage can be characterized by the fact that Uu interface is available for the UE (100) at a given position, less than 100% of the time, due to predictable lack of satellite coverage. Due to Discontinuous coverage, the UE (100) may have access to satellite service coverage only at specific time and places.
Satellite ephemeris Information: GPS satellites transmit information about their location (current and predicted), timing and "health" via what is known as　ephemeris data.
The data is used by the GPS receivers to estimate location relative to the satellites and thus position on earth. The Ephemeris Data can also be used to predict future satellite conditions (for a given place and time) providing a tool for planning when (or when not) to schedule GPS data collection.
FIG. 2 shows a sequence diagram illustrating that the UE (100) and network are out of sync leading to paging miss/missed services to the UE (100) according to an embodiment of the disclosure. At step 1, the UE (100) sends the registration request including the unreachability timer and the active timer to the AMF entity (700). At step 2, the AMF entity (700) and the Network Data Analytics Function (NWDAF) entity (800) perform the reachability estimate for the UE (100). At step 3, the AMF entity (700) sends the registration accept including the negotiated unreachability timer and the active timer. At step 4a, the UE (100) continues listen to paging during the active timers following MICO and ignores the unreachability timer behavior. At step 4b, the AMF entity (700) does not page the UE (100) during active time giving priority to the unreachability period.
At step 4c, the UE (100) may consider itself as unreachable due to unreachability timer running and may ignore listening to paging even though active timer is running following MICO mode. At step 4d, the AMF entity (700) may consider the active timer for the UE (100) (as higher priority over unreachability timer) and may page the UE (100) during active time (considering the UE (100) as reachable).
In other words, the UE (100) indicates to the network or any network function or entity (for e.g., AMF entity (700)) about the unreachability period (unavailability duration or any name) in a NAS or AS signalling message e.g., Registration Request message. The UE (100) may also indicate the active timer or MICO mode indication IE/T3324 to the network or any network function or entity (for e.g. AMF entity (700)) in a NAS or AS signalling message e.g. Registration Request message. The message name is just shown as an example and could be any message.
The AMF entity (700), optionally, requests the unreachability period or reachability period estimate for the UE (100) from other network functions or entities for e.g. NWDAF entity (800).
The AMF entity (700), optionally, replies the negotiated unreachability period to the UE (100) in any NAS or AS signalling message for e.g. Registration Accept message. The AMF entity (700), optionally, replies the negotiated Active Timer value or MICO mode indication IE/T3324 to the UE (100) in any NAS or AS signalling message for e.g., Registration Accept message. The AMF entity (700) may use the negotiated information to determine when the UE (100) is reachable and when the UE (100) is not reachable.
The UE (100) may continue to listen to paging during the active timers following MICO and ignore the unreachability timer behaviour. That is, the UE (100) may give Active Timer higher priority over unreachability timer and consider itself reachable until Active Timer is running. However, the network may consider unreachability period for the UE (100) (as higher priority over the active timer) and may consider that the UE (100) is not reachable if unreachability period is running. Network does not page the UE (100) during active time giving priority to unreachability period and considers the UE (100) as unreachable.
Further, the UE (100) may consider itself as unreachable due to unreachability timer running and may ignore listening to paging even though active timer is running following MICO mode i.e. the UE (100) may give unreachability timer higher priority over Active timer and consider itself unreachable even though Active Timer is running. However, Network may consider Active Timer for the UE (100) (as higher priority over unreachability timer) and may consider that the UE (100) is reachable if Active Timer is running. Network may page the UE (100) during active time giving priority to Active Timer over unreachability period and considers the UE (100) as reachable until Active Timer is running.
In both above mentioned cases (step 4a-step 4d), the UE (100) does either not be able to get the paging message or may miss the paging message from the network. The UE (100) and the network may become out of sync leading to paging miss/missed services to the UE (100). Currently, there is no method to handle the problem and the method needs to be defined to handle the problem.
FIG. 3 shows a sequence diagram of the UE (100) performing cell search, according to an embodiment of the disclosure. At step 1, the UE (100) is in the coverage of satellite access. At step 2a, the UE (100) sends the registration request to the AMF entity (700). At step 2b, the AMF entity (700) sends the registration accept to the UE (100). At step 2c, the NG-RAN (600) performs the rrcConnection release and indicates the rrcConnection release to the UE (100). At step 3, cell coverage is lost due to discontinuous service at the NG-RAN (600). At step 4, the UE (100) is in the discontinuous coverage. At step 5, the UE (100) has mo-data to send. At step 6, the UE (100) performs cell search but no cell is found due to discontinuous coverage. The UE's battery consumption increases.
In other words, the UE is in the coverage of satellite access. The UE (100) and the AMF entity (700) (or any Network function or entity) may negotiate or determine the PSM/MICO mode parameters and active timer values. The UE (100) enters PSM/MICO mode, and on active timer/T3324 expiry, the UE (100) stops listening to paging.
The UE (100) enters into the discontinuous service (Unreachability Period), optionally once unreachability period timer (or any timer name which is used to track unreachability or unavailability period) has started and has no service as the NTN cell coverage is lost. Further, the UE (100) can determine that coverage has lost. That is, the UE (100) entered in NO SERVICE (NO-CELL-AVAILABLE) state or any of the 5GMM sublayer states or EMM sublayer states, optionally by deactivating the access stratum, because of discontinuous coverage, optionally due to at least one of the broadcast information from RAN node like gNodeB or eNodeB or from the 5GC (500) or from application server or any other mechanism.
Further, the UE (100) stays in discontinuous coverage for the determined discontinuous coverage period and waits for the UE (100) to return to coverage. Now, if the UE (100) has mo-data/mo-signalling to send to the network, the UE (100) needs to connect to cell for uplink communication. The UE (100) keeps searching for the network to find service and to perform mo-data transfer/mo-signalling. However, since the UE (100) is in discontinuous service, the UE (100) does not find satellite access and keeps searching for network. This will lead to unnecessary consumption of battery at the UE (100). Currently, there is no method to handle the situation and a method needs to be defined.
FIG. 4 shows a sequence diagram of the UE (100) and the AMF entity (700) for handling power saving in the UE (100) during discontinuous coverage of the satellite access network (1000), according to an embodiment of the disclosure. At step 1, the UE (100) sends the registration request including the unreachability timer and the active timer to the AMF entity (700). At step 2, the AMF entity (700) sends the registration accept including the negotiated unreachability timer and the active timer.
In other words, the UE (100) indicates to the network or any Network function or entity (for e.g., AMF entity (700) /MME) about the unreachability period (unavailability duration or any name) in the NAS or AS signalling message e.g., Registration Request message. The UE (100) may also indicate the active timer or the MICO mode indication IE/T3324 to the network or any Network function or entity (for e.g. AMF entity (700)) in the NAS or AS signalling message e.g. Registration Request message. The message name is just shown as an example and could be any message.
The AMF entity (700) or any network Entity, optionally, replies the negotiated unreachability period to the UE (100) in any NAS or AS signalling message for e.g. Registration Accept message. The AMF entity (700) or any Network Entity, optionally, replies the negotiated Active Timer value or MICO mode indication IE/T3324 to the UE (100) in any NAS or AS signalling message for e.g., Registration Accept message. The AMF entity (700) or any Network Entity may use the negotiated information to determine when the UE (100) is reachable and when the UE (100) is not reachable.
The UE (100) and/or the network entity (for e.g., AMF entity (700)) may perform any of the below procedure in any order or combinations:
In an embodiment of the disclosure, the unreachability period timer is started after Active Timer expires.
The UE (100) and AMF entity (700) /MME may optionally negotiate and are configured with Unreachability Period Timer and Active Timer (T3324).
The UE (100) and AMF entity (700) /MME may decide to run the active Timer (T3324) first and after the Active Timer expires, the UE (100) and AMF entity (700) run the unreachability period timer. The Active Timer and/or the unreachability timer may have any of the value indicated by the UE (100) or the value provided by the network entity (for e.g. AMF entity (700)). Thus, the UE (100) is available for paging/Network may page the UE (100) during the active timer, after expiry of active timer or after stop of the active timer, the UE (100) and AMF entity (700) starts the unreachability period timer.
During the unreachability period timer, the UE (100) is considered as unreachable and the AMF entity (700) does not page the UE (100) and the UE (100) does not listen to paging.
In an embodiment of the disclosure, the UE (100) and the AMF entity (700) may start both unreachability period timer and Active timer, simultaneously or at the same time, but the UE (100) is considered as reachable till Active timer is running i.e., until Active timer expires or stops.
The Active Timer and/or the unreachability timer may have any of the value indicated by the UE (100) or the value provided by the Network Entity (for e.g., AMF entity (700) /MME). Thus, the UE (100) is available for paging / Network may page the UE (100) during the active timer, after expiry of active timer or after stop of the active timer, the UE (100) is considered as unreachable and the Network (for e.g., AMF entity (700)) will not page the UE (100) and the UE (100) will not listen to paging.
When the active timer expires, the UE (100) becomes unavailable or unreachable for the remaining period of unreachability period timer. If the active timer value is higher than unreachability period timer, the device remains reachable for whole duration and the Network may page the UE (100) during the duration when Active Timer is running.
Further, the UE (100) listens to paging messages while the active timer is running. The AMF entity (700) may page the UE (100) till active timer expires.
In an embodiment of the disclosure, the UE (100) and AMF entity (700) may negotiate in any NAS or AS message or any signalling message or in any configuration/pre-configuration message/file/ SIM File or flag regarding which timer to run first and which timer to run later or which timer to ignore or which timer to prioritize or what shall be the value of the timers to be run in any of the AS or NAS signalling message.
In an embodiment of the disclosure, the UE (100)/AMF entity (700) ignores (or does not indicate) the active timer or MICO mode indication IE/T3324 (during registration procedure or any signalling procedure) and consider only unreachability period timer (or unreachability duration or any name) (i.e., Unreachability period timer is given priority).
For example, if the UE (100), optionally, determines both MICO mode and unreachability period timer, the UE (100) supports unreachability period or may/needs to indicate the unreachability period to the Network Entity (for e.g. AMF entity (700) /MME) then the UE (100) does not indicate the active timer during AS/NAS signalling message exchange (for e.g. Registration Request message) i.e. the UE (100) does not include MICO mode indication IE/T3324/eDRX parameters(cycles) or any other power saving parameters if the UE (100) includes unreachability period (e.g., unavailability duration or the like) in the NAS or AS message.
If the UE (100) indicates (optionally) one or both of the Unreachability period timer and MICO mode indication (optionally including T3324), then the Network Entity (for e.g. AMF entity (700) /MME) may consider only the unreachability period timer and may ignore the Active Timer while determining whether the UE (100) is reachable or not and may provide the indication of the same to the UE (100) that only unreachability period timer is considered and Active timer is ignored through any AS/NAS signalling message exchange for e.g. in Registration Accept message by including only unreachability period timer. That is, at any point based on determination that the UE (100) is about to enter discontinuous coverage, AMF entity (700) may indicate unreachability period to the UE (100).
In an embodiment of the disclosure, the UE (100)/AMF entity (700) ignores (or does not indicate) the Unreachability period timer (or unreachability duration or any name) (during registration procedure or any signalling procedure) and consider only active timer or MICO mode indication IE/T3324. (i.e., Active timer is given priority).
For example, if the UE (100) determines both MICO mode and unreachability period timer, the UE (100) may indicate the MICO mode indication (optionally including T3324)/or any other power saving parameter to the Network Entity (for e.g., AMF entity (700) /MME) then the UE (100) does not indicate the unreachability period (unavailability duration) during AS/NAS signalling message exchange (for e.g. Registration Request message) to the network. That is, the UE (100) does not include unreachability period (unavailability duration) if the UE (100) includes MICO mode indication IE/T3324/power saving parameters.
If the UE (100) indicates (optionally) one or both of the Unreachability period timer and MICO mode indication (optionally including T3324), then the Network Entity (for e.g. AMF entity (700) /MME) may consider only MICO mode indication IE/T3324 and may ignore the unreachability period(unavailability duration) while determining whether the UE (100) is reachable or not and may provide the indication of the same to the UE (100) that only MICO mode indication IE/T3324 is considered and unreachability period (unavailability duration) is ignored through any AS/NAS signalling message exchange for e.g. in Registration Accept message by including only MICO mode indication IE/T3324. The message name is just shown as an example and could be any message.
In an embodiment of the disclosure, the UE (100) can indicate the priority of timers (for e.g. which needs to be run (or considered) or run first and which needs to ignored or run later) between active timer and unreachability timer during AS/NAS signalling message exchange (for e.g. Registration Request message). The Network Entity (for e.g., AMF entity (700) or MME) may consider and take this into account to decide which one to apply. In an embodiment of the disclosure, the Network Entity (for e.g., AMF entity (700) or MME) may ignore the priority of the timers indicated by the UE (100) and can apply/run/consider any timer value based on Network decision or implementation. Once the Network Entity (for e.g., AMF entity (700)) decides which timer to run first and which timer to ignore/run later, the Network Entity (AMF entity (700)) may indicate the same to the UE (100) through any AS/NAS signalling message exchange (for e.g., Registration Accept message).
In an embodiment of the disclosure, the network Entity (for e.g., AMF entity (700) or MME) can indicate the priority of timers (for e.g. which needs to be run or run first and which needs to ignored or run later) between the active timer and the unreachability timer during the AS/NAS signalling message exchange (for e.g. Registration Accept message). The UE (100) may consider and take into account to decide which one to apply. In an embodiment of the disclosure, the UE (100) may ignore the priority of the timers indicated by the Network Entity (AMF entity (700) or MME) and can apply/run/consider any timer value based on the UE (100) decision or implementation. Once the UE (100) decides which timer to run first and which timer to ignore/run later, the UE (100) may indicate the same to the Network Entity (AMF entity (700)) through any AS/NAS signalling message exchange. The Network Entity (AMF entity (700)) may accept or reject the UE's decision and may force the UE (100) to run the timers which Network Entity wants to prioritize.
In an embodiment of the disclosure, the discussed solutions are applicable to other timers/power saving parameters as well, like eDRX, Periodic TAU timer etc.
The proposed method in the embodiment is shown with MICO mode and/or Active Timer as an example. The proposed method is applicable to any of the Power Saving Modes (PSM) for any of the RAT(s). The proposed method is applicable to any of the power saving mechanisms/timers/parameters, but not restricted or limited to only these, as shown below:
1. Active Time / MICO mode with Active Time,
2. Extended Connected Time/ MICO mode with Extended Connected time,
3. Periodic TAU Timer / Periodic Update Timer,
4. Periodic Registration Timer / Periodic Registration Update Timer,
5. eDRX parameters (such as cycle length), and
6. Unavailability Period duration unreachability period or unreachability/unavailability information.
Basically all above parameters/timers/information is used by the UE (100) and the network to save power. Thus those are collectively called as power saving parameters in the embodiment.
In an embodiment of the disclosure, the UE (100) can indicate that the UE (100) is requesting power saving parameters due to entering of the UE (100) into discontinuous coverage. The UE (100) may determine that the UE (100) is entering discontinuous coverage by any of: getting into no service or (NO CELL AVAILABLE state) or one of the 5GMM sublayer states or one of the EMM sublayers states or by deactivating the access stratum or by disabling the access stratum for the duration of the discontinuous coverage. For example, the UE (100) can also include the indication (indication can be a new information element or some of the existing information elements in NAS or AS message) together with the UE (100) requested active timer value/PSM timer value or the UE (100) requested eDRX value or PTAU value in registration request message/TAU message or any AS or NAS signalling message.
Once the UE (100) knows that the PSM or No Service or Disabling Access Stratum is due to discontinuous coverage then the UE (100) may go to sleep mode irrespective of PSM/MICO/eDRX. The UE (100) may remain in NO service for e.g., by disabling the access stratum for the duration of the discontinuous coverage.
Optionally, the UE (100) can indicate that the UE (100) is requesting power saving parameters (also referred to as timers/parameters in the embodiment) due to discontinuous coverage by including unreachability period (or unavailability period duration or any name or the UE (100) can be a new dedicated indication indicating the power saving parameters request due to discontinuous coverage or not due to discontinuous coverage).
In an embodiment of the disclosure, the UE (100) enters into NO service or disables (i.e., deactivate) the access stratum when the UE (100) indicates unavailability period duration or the UE (100) indicates Leaving coverage indication to the AMF entity (700) /network.
In an embodiment of the disclosure, the AMF entity (700) while sending the Active timer, PSM timer or eDRX value or periodic timer value can also include an indication that the values are provided to the UE (100) because the UE (100) is entering discontinuous coverage.
If the AMF entity (700) determines that the UE (100) has requested the power saving parameters and the UE (100) is entering into discontinuous coverage (AMF entity (700) can determine based on the UE (100) indication or any other methods as discussed in the embodiment) then the AMF entity (700) sets the power saving parameters/timers based on the requested values from the UE (100) for e.g. if AMF entity (700) is not aware about the discontinuous coverage information for the UE (100) for e.g. when AMF entity (700) is not aware about the NG-RAN satellite access deployment hence, the AMF entity (700) not able to calculate the discontinuous coverage time/period for the UE (100) the request is triggered over satellite access. If AMF entity (700) is aware about the UE (100) entering discontinuous coverage time/period/duration then AMF can set the power saving parameters/timers based on its knowledge after taking into account the UE (100) requested parameters, UEs trajectory, the UE (100) mobility or by ignoring the UE (100) requested parameters.
If AMF entity (700) determines that the UE (100) has requested power saving parameters not due to entering discontinuous coverage then AMF entity (700) can indicate the respective power saving parameters to UE (100)/NG-RAN (600) based on the AMF entity (700) determination of whether the UE (100) enters the discontinuous coverage.
FIG. 5 shows a sequence diagram of the UE (100) determining that unreachability period accept timer is running, according to an embodiment of the disclosure.
At step 1, the UE (100) is in the coverage of satellite access. At step 2a, the UE (100) sends the registration request to the AMF entity (700). At step 2b, the AMF entity (700) sends the registration accept including the unreachability period accept timer and unreachability period wait timer to the UE (100). At step 2c, the NG-RAN (600) performs the rrcConnection release and indicates the rrcConnection release to the UE (100) at the Unreachability period wait timer. At step 3, cell coverage is lost due to discontinuous service at the NG-RAN (600). At step 4, the UE (100) is in the discontinuous coverage. At step 5, the UE (100) has mo-data to send. At step 6, the UE (100) determines that 'unreachability period accept timer' is running, so that the UE (100) does not perform cell search.
In other words, the UE (100) is in coverage of the satellite access. The UE (100) and the AMF entity (700) (or any Network function or entity) may negotiate or determine the PSM/MICO mode parameters and the active timer / or MICO mode indication IE/T3324 values or any of the power saving parameter (for e.g. unavailability information/period duration).
The AMF entity (700) provides a timer (for e.g. unreachability period accept timer or the timer can be any name) in any AS or NAS signalling message for e.g. Registration Accept message or when releasing the rrcConnection or part of any AS/NAS message. The UE (100) starts the timer once the UE (100) enters discontinuous coverage or once the UE (100) receives the NAS/AS message including the timer from network or based on some indication to start the timer from network. The timer may be a single value of duration or time period in seconds (or any value) or a tuple of start time and end time indicating when to start and end the timer value. The end time can be an explicit value or it can be determined by start time and duration in seconds. The UE (100) avoids performing / does not perform PLMN search/scan/selection procedure or cell search/scan/selection/reselection procedure for e.g., by getting into no service state or by deactivating the access stratum when timer is running (i.e. the UE (100) considers this as a discontinuous coverage period). At the expiry or stop of the timer or time duration, the UE (100) again starts performing PLMN/cell search/selection/re-selection procedure. In an embodiment of the disclosure, at the expiry or stop of the timer or time duration or due to any indication from the upper layers (for e.g., Switch off and Switch ON etc) / Network / UE (100), the UE (100) again starts performing PLMN/cell search/selection/re-selection procedure.
In an embodiment of the disclosure, the network entity/network function e.g., AMF entity (700) can provide a timer value (for e.g., unreachability period wait timer or any other name) after which the UE (100) enters Discontinuous coverage with the earlier mentioned timer value (for e.g., unreachability period accept timer or the unreachability period accept timer can be any name). The UE (100) is aware that when the UE (100) applies power saving or till when the UE (100) has to send/receive data. In other words, the UE (100) knows when the discontinuous coverage starts, by taking this into consideration. The UE (100) uses power saving while initiating a NAS procedure, with sufficient time to complete the NAS procedure before the start of the unreachability period.
The network apparatus takes care that the network apparatus pages the UE (100) only if there is a sufficient time to complete the NAS procedure (optionally also considering the amount of pending data and time it may take) before entering discontinuous coverage. Further, the UE (100) enters PSM/MICO mode, and on active timer/T3324 expiry, the UE (100) stops listening to paging.
In an embodiment of the disclosure, the UE (100) enters into discontinuous service (Unreachability Period), optionally once unreachability period timer (or any timer name which is used to track unreachability or unavailability period) has started and has no service as the NTN cell coverage is lost. In an embodiment of the disclosure, the UE (100) can determine that coverage has lost i.e. the UE (100) enters in NO SERVICE (NO-CELL-AVAILABLE) state or any of the 5GMM sublayer states or EMM sublayer states, optionally by deactivating the access stratum, because of discontinuous coverage, optionally due to at least one of the broadcast information from RAN node like gNodeB or eNodeB or receiving signalling message from the 5GC (500) or from application server or any other mechanism.
Further, the UE (100) stays in discontinuous coverage for the determined discontinuous coverage period and waits for the UE (100) to return to coverage.
Now, if the UE (100) has mo-data/mo-signalling to send to the Network apparatus (900), the UE (100) needs to connect to cell for uplink communication.
Further, the UE (100) determines 'unreachability period accept timer' or unavailability period duration accept timer (or any names) is running, so that the UE (100) does not perform PLMN/Cell Scan/Search/selection/re-selection procedure.
If the UE (100) determines 'unreachability period accept timer' is NOT running. Then the UE (100) may perform PLMN/Cell Scan/Search/selection/re-selection procedure.
In an embodiment of the disclosure, if the UE (100) changes the mobility pattern/trajectory for e.g., stationary to non-stationary or non-stationary to stationary, or based on GPS location and NTN cell ephemeris or based on change of direction of the UE (100) movement or the UE (100) based on implementation determines that the UE (100) can get the service, then the UE (100) stops the unreachability period accept timer/time duration and start doing PLMN search/scan/selection procedure or Cell search/scan/selection/reselection procedure. Since the UE (100) direction/position has changed, the discontinuous service information is no longer applicable, and the UE (100) may find cell coverage on performing cell search.
FIG. 6 illustrates a block diagram of the satellite access network (1000) for handling power saving in the UE (100) during discontinuous coverage of the satellite access network (1000), according to an embodiment of the disclosure. In an embodiment of the disclosure, the satellite access network (1000) can be, for example, but not limited to a fourth generation (4G) network, a fifth generation (5G) network, an Open Radio Access Network (ORAN) or the like.
The satellite access network (1000) includes the UE (100) and the network apparatus (900). The UE (100) can be, for example, but not limited to a laptop, a smart phone, a desktop computer, a notebook, a Device-to-Device (D2D) device, a vehicle to everything (V2X) device, a foldable phone, a smart TV, a tablet, an immersive device, and an internet of things (IoT) device. The network apparatus (900) can be, for example, but not limited to the AMF device, the MME or the like.
The UE (100) transmits a registration request message to the network apparatus (900) in the satellite access network (1000) when the UE (100) is in coverage of the satellite access network (1000). The registration request message includes at least one of the unavailability type, the unavailability parameter and the power saving parameter. In an embodiment of the disclosure, the unavailability type indicates a cause of unavailability as discontinuous coverage, due to the NR satellite access discontinuous coverage. If it set to not due to NR satellite access discontinuous coverage then, the network will set appropriate power saving parameters based on its determination that the UE (100) is entering unavailability not due to NR satellite access discontinuous coverage. In an embodiment of the disclosure, the unavailability parameter includes a start of an unavailability period when known to the UE (100) and the unavailability period duration when known to the UE (100). Further, the network apparatus (900) determines the unavailability period duration and the power saving parameter when requested by the UE (100) based on at least one of the indication of the unavailability type and the unavailability parameter. Further, the network apparatus (900) transmits the registration accept message to the UE (100) to optimize power consumption at the UE (100) during the discontinuous coverage of the satellite access network (1000). The registration accept message includes the unavailability period duration and optimal power saving parameters.
Further, the UE (100) receives the registration accept message from the Network apparatus (900). The registration accept message includes the power saving parameter and the unavailability period duration determined by the network apparatus (900), based on indication of the unavailability type and the unavailability parameter. Further, the UE (100) detects that the UE (100) has lost the coverage of the satellite access network (1000). Further, the UE (100) activates the unavailability period duration when the UE (100) has lost the coverage of the satellite access network (1000). Further, the UE (100) determines an action for the activated unavailability period duration to optimize power saving at the UE (100) until the coverage of the satellite access network (1000) is available.
In an embodiment of the disclosure, the action includes configure the UE (100) into a 5GMM-REGISTERED.NO-CELL-AVAILABLE state. In an embodiment of the disclosure, the action includes deactivate the AS function for the NR satellite access in the satellite access network (1000) for the unavailability period duration. In an embodiment of the disclosure, the action includes determine the time period when the coverage of the satellite access network (1000) is available again based on the unavailability period duration.
In an embodiment of the disclosure, the UE (100) receives the optimal power saving parameter when requested by the UE (100) in the registration request message. In an embodiment of the disclosure, the optimal power saving parameter indicates at least one of the periodic registration timer, the extended DRX in CM-IDLE configuration, the MICO mode configuration, and the NG-RAN (600) with extended connected time, the unavailability period parameter like unavailability period etc. Based on the received power saving parameter, the UE (100) performs the power saving.
The UE (100) shuts down its access stratum and does not perform any search based on unavailability period indicated by the network apparatus (900) to conserve the power during discontinuous coverage. The UE (100) explicitly indicates the unavailability type to the network apparatus (900) based on the indication and determination from the UE (100) the UE (100) sets the response unavailability period and power saving parameters.
In an embodiment of the disclosure, the UE (100) indicates the unavailability type to indicate the reason, the UE (100) is entering the unavailability to the network, based on this value network determines the power saving parameters (e.g. periodic registration timer value, eDRX, MICO, unavailability period duration) and unavailability parameters (e.g. unavailability duration). The unavailability type value can be, UE is entering unavailability due to NR satellite access discontinuous coverage or it can be set to not due to NR satellite access discontinuous coverage.
FIG. 7 shows various hardware components of the UE (100) according to an embodiment of the disclosure. In an embodiment of the disclosure, the UE (100) includes a processor (110), a communicator (120), a memory (130) and a satellite discontinuous coverage controller (140). The processor (110) is coupled with the communicator (120), the memory (130) and the satellite discontinuous coverage controller (140).
The satellite discontinuous coverage controller (140) transmits the registration request message to the network apparatus (900) in the satellite access network (1000) when the UE (100) is in coverage of the satellite access network (1000). The registration request message includes the unavailability type, the unavailability parameter and the power saving parameter. Further, the satellite discontinuous coverage controller (140) receives the registration accept message from the network apparatus (900). The registration accept message includes the power saving parameter and the unavailability period duration determined by the Network apparatus (900), based on indication of the unavailability type and the unavailability parameter. Further, the satellite discontinuous coverage controller (140) detects that the UE (100) has lost the coverage of the satellite access network (1000). Further, the satellite discontinuous coverage controller (140) activates the unavailability period duration when the UE (100) has lost the coverage of the satellite access network (1000). Further, the satellite discontinuous coverage controller (140) determines the action for the activated unavailability period duration to optimize power saving at the UE (100) until the coverage of the satellite access network (1000) is available.
In an embodiment of the disclosure, the satellite discontinuous coverage controller (140) receives the optimal power saving parameter when requested by the UE (100) in the registration request message. Based on the received power saving parameter, the satellite discontinuous coverage controller (140) performs the power saving.
The AMF entity (700) provides unavailability duration to the UE (100). Based on received unavailability duration from the AMF entity (700), the UE (100) deactivates the access stratum, enters NO CELL AVAILABLE state, determines when the coverage will return. The UE (100) explicitly indicates the unavailability type to the network apparatus (900). Based on the unavailability type and unavailability period duration, the UE (100) sets the power saving parameters.
The satellite discontinuous coverage controller (140) is implemented by analog and/or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and may optionally be driven by firmware.
The processor (110) may include one or a plurality of processors. The one or the plurality of processors may be a general-purpose processor, such as a central processing unit (CPU), an application processor (AP), or the like, a graphics-only processing unit such as a graphics processing unit (GPU), a visual processing unit (VPU), and/or an AI-dedicated processor such as a neural processing unit (NPU). The processor (110) may include multiple cores and is configured to execute the instructions stored in the memory (130). The processor (110) controls the satellite discontinuous coverage controller (140) to perform various operations.
The processor (110) indicates, to an access and mobility management function (AMF), a registration request message including an unavailability type, receives, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type, and performs at least one action during the unavailability period duration.
The processor (110) enters 5GMM-REGISTERED.NO-CELL-AVAILABLE, deactivates an access stratum, and determines when to return to coverage.
The processor (110) requests a power saving parameter to the AMF, wherein the power saving parameter is determined by the AMF based on the unavailability period duration.
Further, the processor (110) is configured to execute instructions stored in the memory (130) and to perform various processes. The communicator (120) is configured for communicating internally between internal hardware components and with external devices via one or more networks. The memory (130) also stores instructions to be executed by the processor (110). The memory (130) may include non-volatile storage elements. Examples of such non-volatile storage elements may include magnetic hard discs, optical discs, floppy discs, flash memories, or forms of electrically programmable memories (EPROM) or electrically erasable and programmable memories (EEPROM). In addition, the memory (130) may, in some examples, be considered a non-transitory storage medium. The term "non-transitory" may indicate that the storage medium is not embodied in a carrier wave or a propagated signal. However, the term "non-transitory" should not be interpreted that the memory (130) is non-movable. In certain examples, a non-transitory storage medium may store data that can, over time, change (e.g., in Random Access Memory (RAM) or cache).
In an embodiment of the disclosure, the communicator (120) includes an electronic circuit specific to a standard that enables wired or wireless communication. The communicator (120) is configured to communicate internally between internal hardware components of the UE (100) and with external devices via one or more networks.
Although the FIG. 7 shows various hardware components of the UE (100) but it is to be understood that other embodiments are not limited thereon. In an embodiment of the disclosure, the UE (100) may include less or more number of components. Further, the labels or names of the components are used only for illustrative purpose and does not limit the scope of the invention. One or more components can be combined together to perform same or substantially similar function in the UE (100).
FIG. 8 shows various hardware components of the network apparatus (900), according to an embodiment of the disclosure. In an embodiment of the disclosure, the network apparatus (900) includes a processor (910), a communicator (920), a memory (930) and a satellite discontinuous coverage controller (940). The processor (910) is coupled with the communicator (920), the memory (930) and the satellite discontinuous coverage controller (940).
The satellite discontinuous coverage controller (940) receives the registration request message from the UE (100) when the UE (100) is in coverage of the satellite access network (1000). The registration request message includes the unavailability type, the unavailability parameter and the power saving parameter. Further, the satellite discontinuous coverage controller (940) determines the unavailability period duration and the power saving parameter when requested by the UE (100) based on indication of the unavailability type and the unavailability parameter. Further, the satellite discontinuous coverage controller (940) transmits the registration accept message to the UE (100) to optimize power consumption at the UE (100) during the discontinuous coverage of the satellite access network (1000). The registration accept message includes the unavailability period duration and the optimal power saving parameters.
The satellite discontinuous coverage controller (940) is implemented by analog and/or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and may optionally be driven by firmware.
The processor (910) may include one or a plurality of processors. The one or the plurality of processors may be a general-purpose processor, such as a central processing unit (CPU), an application processor (AP), or the like, a graphics-only processing unit such as a graphics processing unit (GPU), a visual processing unit (VPU), and/or an AI-dedicated processor such as a neural processing unit (NPU). The processor (910) may include multiple cores and is configured to execute the instructions stored in the memory (930). The processor (910) controls the satellite discontinuous coverage controller (940) to perform various operations.
The processor (910) obtains a registration request message including an unavailability type, determines an unavailability period duration based on the unavailability type, and transmits, to a user equipment (UE), a registration accept message including the unavailability period duration.
The processor (910) determines a power saving parameter based on the unavailability period duration when the power saving parameter is requested from the UE.
Further, the processor (910) is configured to execute instructions stored in the memory (930) and to perform various processes. The communicator (920) is configured for communicating internally between internal hardware components and with external devices via one or more networks. The memory (930) also stores instructions to be executed by the processor (910). The memory (930) may include non-volatile storage elements. Examples of such non-volatile storage elements may include magnetic hard discs, optical discs, floppy discs, flash memories, or forms of electrically programmable memories (EPROM) or electrically erasable and programmable memories (EEPROM). In addition, the memory (930) may, in some examples, be considered a non-transitory storage medium. The term "non-transitory" may indicate that the storage medium is not embodied in a carrier wave or a propagated signal. However, the term "non-transitory" should not be interpreted that the memory (930) is non-movable. In certain examples, a non-transitory storage medium may store data that can, over time, change (e.g., in Random Access Memory (RAM) or cache).
In an embodiment of the disclosure, the communicator (920) includes an electronic circuit specific to a standard that enables wired or wireless communication. The communicator (920) is configured to communicate internally between internal hardware components of the UE (100) and with external devices via one or more networks.
Although the FIG. 8 shows various hardware components of the network apparatus (900) but it is to be understood that other embodiments are not limited thereon. In an embodiment of the disclosure, the network apparatus (900) may include less or more number of components. Further, the labels or names of the components are used only for illustrative purpose and does not limit the scope of the invention. One or more components can be combined together to perform same or substantially similar function in the network apparatus (900).
FIG. 9 is a flow chart (S900) illustrating a method, implemented by the UE (100), for handling power saving in the UE (100) during discontinuous coverage of the satellite access network (1000), according to an embodiment of the disclosure. The operations (S902-S910) are handled by the satellite discontinuous coverage controller (140).
At S902, the method includes transmitting the registration request message to the network apparatus (900) when the UE (100) is in coverage of the satellite access network (1000). The registration request message includes at least one of the unavailability type, the unavailability parameter and the power saving parameter. At S904, the method includes receiving the registration accept message from the network apparatus (900). The registration accept message includes at least one of the power saving parameter and the unavailability period duration determined by the network apparatus (900), based on indication of the unavailability type and the unavailability parameter. At S906, the method includes detecting that the UE (100) has lost the coverage of the satellite access network (1000). At S908, the method includes activating the unavailability period duration when the UE (100) has lost the coverage of the satellite access network (1000). At S910, the method includes determining the action for the activated unavailability period duration to optimize power saving at the UE (100) until the coverage of the satellite access network (1000) is available.
In an embodiment of the disclosure, the action includes configuring the UE (100) into the 5GMM-REGISTERED.NO-CELL-AVAILABLE state. In an embodiment of the disclosure, the action includes deactivate the AS function for the NR satellite access in the satellite access network (1000) for the unavailability period duration. In an embodiment of the disclosure, the action includes determine the time period when the coverage of the satellite access network (1000) is available again based on the unavailability period duration.
FIG. 10 is a flow chart (S1000) illustrating a method, implemented by the network apparatus (900), for handling power saving in the UE (100) during discontinuous coverage of the satellite access network (1000), according to an embodiment of the disclosure. The operations (S1002-S1006) are handled by the satellite discontinuous coverage controller (940).
At S1002, the method includes receiving the registration request message from the UE (100) when the UE (100) is in coverage of the satellite access network (1000). The registration request message includes at least one of the unavailability type, an unavailability parameter and a power saving parameter. At S1004, the method includes determining at least one of the unavailability period duration and the power saving parameter when requested by the UE (100) based on indication of the unavailability type and the unavailability parameter. At S1006, the method includes transmitting the registration accept message to the UE (100) to optimize power consumption at the UE (100) during the discontinuous coverage of the satellite access network (1000). The registration accept message includes at least one of the unavailability period duration and optimal power saving parameters.
In an embodiment of the disclosure, a method performed by a user equipment (UE) comprises entering 5GMM-REGISTERED.NO-CELL-AVAILABLE; deactivating an access stratum; and determining when to return to coverage.
In an embodiment of the disclosure, the unavailability type indicates a cause of unavailability due to discontinuous coverage. In an embodiment of the disclosure, a method performed by a user equipment (UE) comprises requesting a power saving parameter, wherein the power saving parameter is determined by the AMF based on the unavailability period duration.
In an embodiment of the disclosure, the power saving parameter comprises at least one of a periodic registration update timer, an extended discontinuous reception (DRX) in CM-IDLE configuration, a mobile initiated communication only (MICO) mode configuration, and a next generation radio access network (NG-RAN) with extended connected time. In an embodiment of the disclosure, the registration request message comprises at least one of a MICO indication, a requested active time, and a requested DRX parameter.
In an embodiment of the disclosure, the at least one processor is configured to: enter 5GMM-REGISTERED.NO-CELL-AVAILABLE, deactivate an access stratum, and determine when to return to coverage. In an embodiment of the disclosure, the at least one processor is configured to: request a power saving parameter to the AMF, wherein the power saving parameter is determined by the AMF based on the unavailability period duration.
In an embodiment of the disclosure, the at least one processor is configured to: when a power saving parameter is requested from the UE, determine the power saving parameter based on the unavailability period duration.
The various actions, acts, blocks, steps, or the like in the flow charts (S900 and S1000) may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some of the actions, acts, blocks, steps, or the like may be omitted, added, modified, skipped, or the like without departing from the scope of the invention.
The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the embodiments as described herein.

Claims (15)

  1. A method performed by a user equipment (UE), the method comprising:
    indicating, to an access and mobility management function (AMF), a registration request message including an unavailability type;
    receiving, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type; and
    performing at least one action during the unavailability period duration.
  2. The method of claim 1, wherein the performing of the at least one action during the unavailability period duration comprises:
    entering 5GMM-REGISTERED.NO-CELL-AVAILABLE;
    deactivating an access stratum; and
    determining when to return to coverage.
  3. The method of claim 1, wherein the unavailability type indicates a cause of unavailability due to discontinuous coverage.
  4. The method of claim 1, further comprising:
    requesting a power saving parameter to the AMF, wherein the power saving parameter is determined by the AMF based on the unavailability period duration.
  5. The method of claim 4, wherein the power saving parameter comprises at least one of a periodic registration update timer, an extended discontinuous reception (DRX) in CM-IDLE configuration, a mobile initiated communication only (MICO) mode configuration, and a next generation radio access network (NG-RAN) with extended connected time.
  6. The method of claim 1, wherein the registration request message comprises at least one of a MICO indication, a requested active time, and a requested DRX parameter.
  7. A user equipment (UE) comprising:
    a transceiver; and
    at least one processor coupled to the transceiver, configured to:
    indicate, to an access and mobility management function (AMF), a registration request message including an unavailability type,
    receive, from the AMF, a registration accept message including an unavailability period duration, wherein the unavailability period duration is determined by the AMF based on the unavailability type, and
    perform at least one action during the unavailability period duration.
  8. The UE of claim 7, wherein the at least one processor is configured to:
    enter 5GMM-REGISTERED.NO-CELL-AVAILABLE,
    deactivate an access stratum, and
    determine when to return to coverage.
  9. The UE of claim 7, wherein the unavailability type indicates a cause of unavailability due to discontinuous coverage.
  10. The UE of claim 7, wherein the at least one processor is further configured to:
    request a power saving parameter to the AMF, wherein the power saving parameter is determined by the AMF based on the unavailability period duration.
  11. The UE of claim 7, wherein the power saving parameter comprises at least one of a periodic registration update timer, an extended discontinuous reception (DRX) in CM-IDLE configuration, a mobile initiated communication only (MICO) mode configuration, and a next generation radio access network (NG-RAN) with extended connected time.
  12. The UE of claim 7, wherein the registration request message comprises at least one of a MICO indication, a requested active time, and a requested DRX parameter.
  13. An access and mobility management function (AMF) comprising:
    a transceiver; and
    at least one processor coupled to the transceiver, configured to:
    obtain a registration request message including an unavailability type,
    determine an unavailability period duration based on the unavailability type, and
    transmit, to a user equipment (UE), a registration accept message including the unavailability period duration.
  14. The AMF of claim 13, wherein the unavailability type indicates a cause of unavailability due to discontinuous coverage.
  15. The AMF of claim 13, wherein the at least one processor is further configured to:
    when a power saving parameter is requested from the UE, determine the power saving parameter based on the unavailability period duration.
PCT/KR2024/000024 2023-01-02 2024-01-02 Handling power saving in ue during discontinuous coverage of satellite access network Ceased WO2024147590A1 (en)

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CN202480006449.0A CN120530682A (en) 2023-01-02 2024-01-02 Handling power conservation in UE during discontinuous coverage of satellite access networks

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