US20190182884A1 - Connectivity supervision and recovery - Google Patents

Connectivity supervision and recovery Download PDF

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Publication number
US20190182884A1
US20190182884A1 US16/324,481 US201716324481A US2019182884A1 US 20190182884 A1 US20190182884 A1 US 20190182884A1 US 201716324481 A US201716324481 A US 201716324481A US 2019182884 A1 US2019182884 A1 US 2019182884A1
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wtru
supervision
transmission
recovery
control channel
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US16/324,481
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Yugeswar DEENOO
Ping Hsuan Tan
Ghyslain Pelletier
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IDAC Holdings Inc
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IDAC Holdings Inc
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Priority to US16/324,481 priority Critical patent/US20190182884A1/en
Assigned to IDAC HOLDINGS, INC. reassignment IDAC HOLDINGS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PELLETIER, GHYSLAIN, DEENOO, Yugeswar, TAN, PING HSUAN
Publication of US20190182884A1 publication Critical patent/US20190182884A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • 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

  • a WTRU may supervise its capability to transmit and receive data, including in the absence of a control channel (e.g., grant-less transmission).
  • a supervision framework may permit a WTRU to supervise, for example, quality of a feedback channel, quality of reciprocal resources and/or transmission attempts.
  • the WTRU may be configured to take one or more of a plurality of recovery actions depending on the conditions related to a plurality of supervision processes.
  • the base station 114 b and the WTRUs 102 c, 102 d may implement a radio technology such as IEEE 802.15 to establish a wireless personal area network (WPAN).
  • the base station 114 b and the WTRUs 102 c, 102 d may utilize a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, LTE-A Pro, NR etc.) to establish a picocell or femtocell.
  • a cellular-based RAT e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, LTE-A Pro, NR etc.
  • the base station 114 b may have a direct connection to the Internet 110 .
  • the base station 114 b may not be required to access the Internet 110 via the CN 106 / 115 .
  • the processor 118 may receive power from the power source 134 , and may be configured to distribute and/or control the power to the other components in the WTRU 102 .
  • the power source 134 may be any suitable device for powering the WTRU 102 .
  • the power source 134 may include one or more dry cell batteries (e.g., nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel metal hydride (NiMH), lithium-ion (Li-ion), etc.), solar cells, fuel cells, and the like.
  • the WRTU 102 may include a half-duplex radio for which transmission and reception of some or all of the signals (e.g., associated with particular subframes for either the UL (e.g., for transmission) or the downlink (e.g., for reception)).
  • a half-duplex radio for which transmission and reception of some or all of the signals (e.g., associated with particular subframes for either the UL (e.g., for transmission) or the downlink (e.g., for reception)).
  • the MME 162 may be connected to each of the eNode-Bs 162 a, 162 b, 162 c in the RAN 104 via an S1 interface and may serve as a control node.
  • the MME 162 may be responsible for authenticating users of the WTRUs 102 a, 102 b, 102 c, bearer activation/deactivation, selecting a particular serving gateway during an initial attach of the WTRUs 102 a, 102 b, 102 c, and the like.
  • the MME 162 may provide a control plane function for switching between the RAN 104 and other RANs (not shown) that employ other radio technologies, such as GSM and/or WCDMA.
  • a WLAN in Infrastructure Basic Service Set (BSS) mode may have an Access Point (AP) for the BSS and one or more stations (STAs) associated with the AP.
  • the AP may have an access or an interface to a Distribution System (DS) or another type of wired/wireless network that carries traffic in to and/or out of the BSS.
  • Traffic to STAs that originates from outside the BSS may arrive through the AP and may be delivered to the STAs.
  • Traffic originating from STAs to destinations outside the BSS may be sent to the AP to be delivered to respective destinations.
  • Traffic between STAs within the BSS may be sent through the AP, for example, where the source STA may send traffic to the AP and the AP may deliver the traffic to the destination STA.
  • the traffic between STAs within a BSS may be considered and/or referred to as peer-to-peer traffic.
  • the peer-to-peer traffic may be sent between (e.g., directly between) the source and destination STAs with a direct link setup (DLS).
  • the DLS may use an 802.11e DLS or an 802.11z tunneled DLS (TDLS).
  • a WLAN using an Independent BSS (IBSS) mode may not have an AP, and the STAs (e.g., all of the STAs) within or using the IBSS may communicate directly with each other.
  • the IBSS mode of communication may sometimes be referred to herein as an “ad-hoc” mode of communication.
  • WTRUs 102 a, 102 b , 102 c may communicate with gNBs 180 a, 180 b, 180 c using signals in an unlicensed band.
  • WTRUs 102 a, 102 b, 102 c may communicate with/connect to gNBs 180 a, 180 b, 180 c while also communicating with/connecting to another RAN such as eNode-Bs 160 a, 160 b, 160 c.
  • Support for ultra-low transmission latency may comprise, for example, air interface latency such as a 1 ms (or less) round trip time (RTT) and/or transmission time intervals (TTIs) between 100 ⁇ s and 250 ⁇ s.
  • RTT round trip time
  • TTIs transmission time intervals
  • Support may be provided for ultra-low access latency (e.g., time from initial system access until the completion of the transmission of the first user plane data unit).
  • End-to-end (e2e) latency less than 10 ms may be supported, for example, for ICC and V2X applications.
  • a system signature may consist of any type of signal received by a WTRU for one or more purposes described herein.
  • WTRUs served within a slice may have, for example, one or more of the following aspects in common: (i) services and/or QoE requirements (e.g., ULLRC, eMBB, MMTC); (ii) WTRU categories (e.g., CAT 0 to M and beyond, additional categories may be defined for >6 GHz to differentiate beamforming capability); (iii) coverage requirements (e.g., normal coverage, enhanced coverage); (iv) PLMN/Operators; (v) support for a specific Uu interface (e.g., LTE, LTE-Evo, 5G below 6 Ghz, 5G above 6 Ghz, Unlicensed) and/or (vi) served by the same core network slice.
  • QoE requirements e.g., ULLRC, eMBB, MMTC
  • WTRU categories e.g., CAT 0 to M and beyond, additional categories may be defined for >6 GHz to differentiate beamforming capability
  • coverage requirements e.g.
  • LTE radio link monitoring may involve monitoring a downlink (DL) radio link condition of a serving cell.
  • a WTRU may monitor downlink radio quality against thresholds (e.g., Qout and Qin) for a (e.g., every) frame or DRX period, for example, depending whether DRX may be activated.
  • a physical layer may indicate in-sync or out-of-sync to higher layers (e.g., radio resource control (RRC)), for example, when radio link quality may be better than Qin or worse than Qout (respectively).
  • RRC radio resource control
  • the WTRU may have had to perform multiple steps to recover from Radio Link Failure (RLF) while in a connected state.
  • the recovery may include, for example, releasing configured resources, transitioning to idle mode, executing a cell selection, initiating contention based random access, waiting for contention resolution and performing a layer 3 procedure such as a re-establishment procedure.
  • Data transmission to/from a WTRU may have been interrupted during radio link recovery.
  • a WTRU may have not resumed data transfer, for example, until (e.g., all) recovery steps were completed.
  • Such data interruption can negatively affect a quality of experience by an end user.
  • Such service interruption for a radio link failure for services such as URLLC applications may lead to intolerable service interruption times for the application.
  • Grant-free/Grant-less access may reduce overhead associated with network access and with providing grants before transmissions. Grant-free access may be used to speed up access, for example, when moving from inactive to active state, e.g., by eliminating the need to access a channel, request resources and wait for a grant. Monitoring may be provided for capabilities of grant-less access.
  • One or more control channels that belong to the same or different control channel type may be used in a cell.
  • a control channel type may be characterized by one or more aspects alone or in any combination.
  • a control channel type may be characterized, for example, by WTRUs monitoring the control channel, such as whether a control channel is visible to all or a subset of WTRUs in a cell or dedicated to a specific WTRU, etc.
  • a WTRU may be configured to performed supervision measurement(s) and detect one or more types of radio failure based on the supervision measurement(s).
  • a Supervision Process may be characterized by a procedure by which the WTRU performs monitoring of one or more resources (e.g., reference signals, control channels, etc.) according to a set of configuration parameters and/or rules.
  • a supervision process may include set of contextual information and/or state of monitoring activity.
  • a WTRU may have zero or one or more supervision processes instantiated at any point in time.
  • WTRU actions may be determined by a comparison of the status of a supervision process against a (pre-) defined or configured criteria.
  • Supervision failure may be declared, for example, when a supervision process fails to meet the criteria. Different type of recovery actions may be performed depending on which supervisory process fails to meet its predefined or configured criteria.
  • a WTRU may instantiate a supervision process for grant-free resources based on one or more events alone or in any combination. For example, a WTRU may instantiate a supervision process upon arrival of a UL data that may be mapped to grant-less traffic according to packet forwarding treatment (e.g., based on size of data packet data unit (PDU), type of data PDU, service type).
  • PDU data packet data unit
  • a WTRU may instantiate a supervision process if the WTRU has not received a valid grant and has packet latency that may be below budget.
  • a WTRU may instantiate a supervision process upon entering a cell that may support grant-less access.
  • a WTRU may instantiate a supervision process when a WTRU gets configured with grant-less resources.
  • a supervised aspect associated with grant-free transmission may include a quality of a feedback channel.
  • a WTRU may monitor the received quality of a downlink feedback channel associated with a grant-free UL transmission.
  • a (e.g., each) downlink feedback channel may be associated with a (e.g., unique) reference signal.
  • a WTRU may determine a quality of the downlink feedback channel using the measurements over the associated reference signal.
  • a reference signal may be cell specific, WTRU specific or may be dedicated for grant-free transmission feedback.
  • a reference signal associated with a feedback channel may be a demodulation reference signal.
  • a supervision process may be a function of control channel structure.
  • a WTRU may associate multiple supervision processes with a single control channel.
  • a purpose for a (e.g., each) supervision process may be to monitor one or more specific aspects associated with a control channel.
  • a WTRU may monitor a (e.g., single) control channel for multiple purposes. For example, WTRUs in a light connected state may monitor a control channel for a RAN paging, which may be limited to certain control message types and/or control regions within the control channel. For example, WTRUs that may need enhanced coverage may require repetition of the same control channel for a successful reception of a downlink control message.
  • a WTRU may associate an independent supervision process with a monitored independent control channel.
  • a WTRU may be configured with an active control channel and a backup control channel.
  • a WTRU may instantiate a supervision process associated with a backup control channel, for example, based on a status of a supervision process associated with an active control channel.
  • a supervision process may monitor a reliability of a dependent control channel. Reliability of a first control channel may be a function of reliability of a second control channel. A supervision process associated with a first control channel may be linked to another supervision process associated with a second control channel. A WTRU may trigger a supervision of an independent control channel, for example, when a dependent control channel reliability falls below a threshold.
  • a flexible configuration for a supervision process may be defined.
  • the function and parameterization of a supervision process may be a function of quality of service.
  • a WTRU may be configured for a plurality of supervision processes.
  • a (e.g., each) supervision process may be associated with a type of service.
  • a supervision process may monitor an expected quality of service offered to the WTRU, which may include, for example, monitoring one or more of the following: (i) average packet delay, (ii) average number of retransmission attempts, (iii) number of cycle redundancy check (“CRC”) failures on a control channel, (iv) average data rate, and/or (v) quality of a link.
  • CRC cycle redundancy check
  • An average packet delay may be monitored.
  • An average packet delay may be based on the time when a packet was received at radio interface protocol layers as compared to a time when a successful acknowledgement of reception may be received from the network.
  • a WTRU may declare a supervision failure, for example, when an average packet delay may be above a predefined threshold.
  • Losing a serving data beam associated with a serving TRP may be based on, for example, a reference signal threshold associated with a data beam process.
  • a serving data beam may refer to a beam process actively scheduled.
  • a WTRU may transition to a light connected state and resume a connection, for example, when the WTRU may be in a connected state and a radio link failure may be detected.
  • a WTRU may, e.g., alternatively, transition to idle and initiate a re-establishment procedure.
  • a WTRU (e.g., in light connected state) may, for example, attempt to recover within its present state (e.g., using dedicated resources), attempt to recover using other resources (e.g., common, grant-less) or (e.g., alternatively) transition to idle.
  • a WTRU may instantiate supervision processes, for example, based on one or more (e.g., specific) control channels associated with a state.
  • a WTRU may determine the type of channels to monitor, for example, based on the data transfer methods/resources associated with the state.
  • a WTRU may instantiate a (e.g., similar) supervision process to monitor the paging channel in light connected and connected states.
  • a WTRU (e.g., in light connected state) may operate with a longer DRX and may monitor a paging channel for system information update (e.g., while monitoring for an incoming call).
  • a WTRU (e.g., in connected state) may monitor a paging channel (e.g., only) for system information update (e.g., related to ETWS and CMAS) using a different DRX.
  • a supervision process may be associated with a control function, a MAC instance, a layer or a radio interface.
  • a radio link monitoring procedure in a WTRU may assume failure in layer 3 connectivity for different failure scenarios across multiple (e.g., all) protocol layers, such as an L1 failure (e.g., due to Out-of-Sync), a MAC failure (e.g., due to random access failure) and an RLC failure (e.g., when a max retransmission may be reached).
  • L1 failure e.g., due to Out-of-Sync
  • a MAC failure e.g., due to random access failure
  • RLC failure e.g., when a max retransmission may be reached.
  • a layer 3 procedure e.g., cell selection and RRC Reestablishment
  • recover the link in multiple failure scenarios e.g., cell selection and RRC Reestablishment
  • a plurality of recovery procedures may be defined.
  • a (e.g., each) recovery procedure may provide a tradeoff between different levels of overhead and service interruption.
  • a WTRU may select a recovery procedure, for example, based on one or more of the following: (i) a service affected by the interruption (e.g., URLLC or eMBB), (ii) failure criteria or event (e.g., control channel failure, data transmission failure or QoS failure) and/or (iii) failure of a previous recovery method (e.g., when a dedicated random access fails, switch to a different cell or perform alternate recovery).
  • a service affected by the interruption e.g., URLLC or eMBB
  • failure criteria or event e.g., control channel failure, data transmission failure or QoS failure
  • failure of a previous recovery method e.g., when a dedicated random access fails, switch to a different cell or perform alternate recovery.
  • a WTRU may utilize alternate access procedures (e.g., use a grant-less access), for example, instead of a contention based random access.
  • alternate access procedures e.g., use a grant-less access
  • a WTRU may (e.g., in the event of a supervision failure) retain parts of layer 2 context (e.g., parts of a layer 2 configuration and/or protocol state of layer 2).
  • a WTRU may activate layer 2 configuration associated with a light connected state.
  • a WTRU may perform data transfer (e.g., when allowed) in light connected state while recovery for a fully connected state may be ongoing.
  • a WTRU (e.g., to avoid excess resource usage due to data replication) may be configured with a maximum duration for which data replication may be allowed.
  • a WTRU (e.g., upon exceeding a maximum duration) may consider a failed MAC instance as disconnected and may promote a supporting MAC instance to a serving MAC instance (e.g., when not already serving).
  • a WTRU may experience a supervision failure in light connected state (e.g., based on reliability of RAN paging channel).
  • a WTRU may transition from a light connected state to an idle state and may perform a tracking area update procedure or a NAS signaling procedure, for example, to synchronize the WTRU state and core network state.
  • a tracking area update or NAS signaling procedure may be implemented, for example, when a WTRU and core network may not be synchronized in a light connected state.
  • a WTRU may be in a light connected state from a RAN point of view while the WTRU may be in a connected state from a core network point of view.
  • FIGS. 2-4 provide examples of supervisory processes.
  • FIGS. 2-4 show a node or TRP communicating with a WTRU. Each TRP has beams y and z.
  • FIG. 3 shows a radio link failure has been determined, and
  • FIG. 4 shows an example recovery.
  • the WTRU may monitor the average data packet latency for URLLC.
  • the failure criteria or event may be defined as if the average data packet latency ⁇ a threshold time.
  • the WTRU monitors the average data packet latency and determines if the failure event threshold is satisfied. If the WTRU determines that the failure criteria is satisfied, the WTRU determines to and performs a recovery action.
  • the recovery action may include triggering a different transmission method.
  • User plane recovery may include reuse of layer2 context, data replication to companion MAC instances, etc.
  • Control plane recovery may use RAN paging, WTRU triggered multi-connectivity, etc.
  • a recovery procedure for a supervision process associated with a beam process may include WTRU triggering beam training/beam refinement, etc.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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US16/324,481 US20190182884A1 (en) 2016-08-10 2017-08-10 Connectivity supervision and recovery
PCT/US2017/046335 WO2018031799A1 (fr) 2016-08-10 2017-08-10 Surveillance et récupération de connectivité

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US20210329724A1 (en) 2021-10-21
US11877337B2 (en) 2024-01-16

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