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WO2018134470A1 - Maintien d'une seconde liaison dans des opérations d'agrégation pendant une rlf de liaison primaire - Google Patents

Maintien d'une seconde liaison dans des opérations d'agrégation pendant une rlf de liaison primaire Download PDF

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Publication number
WO2018134470A1
WO2018134470A1 PCT/FI2017/050032 FI2017050032W WO2018134470A1 WO 2018134470 A1 WO2018134470 A1 WO 2018134470A1 FI 2017050032 W FI2017050032 W FI 2017050032W WO 2018134470 A1 WO2018134470 A1 WO 2018134470A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
secondary link
link connections
connection
connections
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/FI2017/050032
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English (en)
Inventor
Irina-Mihaela BALAN
Bernhard Wegmann
Richard Waldhauser
Eva PEREZ
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Nokia Technologies Oy
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Nokia Technologies Oy
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Priority to PCT/FI2017/050032 priority Critical patent/WO2018134470A1/fr
Publication of WO2018134470A1 publication Critical patent/WO2018134470A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/14—Multichannel or multilink protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the teachings in accordance with the exemplary embodiments of this invention relate generally to an enhancement mechanism for dual and multi-link connectivity and, more specifically, relate to a modification of behavior of a network device upon detection of a radio link failure in order to maintain connectivity.
  • PCell Primary Cell PSCell Primary Secondary Cell (the monitored cell of the SCG)
  • E-UTRAN supports dual or multi- link connectivity such as LTE-WLAN aggregation (LWA) operation whereby a UE in RRC CONNECTED can be configured by an eNB to utilize radio resources of more than one communication system.
  • LWA LTE-WLAN aggregation
  • a network device such as a UE configured to use dual or multi- link connectivity such as via another communication system e.g., LWA may experience a radio link failure (RLF) because of poor quality of a primary communication system e.g., LTE link for example.
  • RLF radio link failure
  • the network releases connectivity with the device after detecting the RLF and the device will also drop the connectivity to a secondary connectivity source such as a WLAN AP, even if the secondary connectivity is operational.
  • the example embodiments of the invention work to address at least this issue and improve on at least these operations.
  • an apparatus such as a communication network user equipment or mobile device, comprising: at least one processor; and at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least: establish a connection to a network node of a communication network, wherein the connection comprises a primary link connection to a first network node and one or more secondary link connections to nodes of a same or different network; detect a radio link failure on the primary link connection; and based on determining that one or more further conditions are not present, maintain at least one of the one or more secondary link connections.
  • a method comprising: establishing, by a user equipment, a connection to a network node of a communication network, wherein the connection comprises a primary link connection to a first network node and one or more secondary link connections to nodes of a same or different network; detecting, by the user equipment, a radio link failure on the primary link connection; and based on determining that one or more further conditions are not present, maintaining at least one of the one or more secondary link connections.
  • a further example embodiment is a method comprising the method of the previous paragraph, wherein the one or more further conditions comprises one or more of: the user equipment received an Radio Resource Control message from a different node/cell of the first network, data is no longer being received over all of the one or more secondary link connections for a predefined period, a radio link failure of all of the one or more secondary link connections is detected by the user equipment, and the network node has terminated all of the one or more secondary link connections; wherein radio link failure detection is performed at different times for each of the primary link connection and the one or more secondary link connections; and wherein determining if one or more further conditions are present is performed on a repeating basis, and where there is, based on determining that the one or more further conditions are present on all the one or more secondary link connections, dropping one or more secondary link connections; and entering, by the user equipment, an idle state if no secondary link connections are left.
  • a non-transitory computer-readable medium storing program code, the program code executed by at least one processor to perform at least the method as described in the paragraphs above.
  • an apparatus comprising means for establishing a connection to a network node of a communication network, wherein the connection comprises a primary link connection to a first network node and one or more secondary link connections to nodes of a same or different network; means for detecting a radio link failure on the primary link connection; and means, based on determining that one or more further conditions are not present, for maintaining at least one of the one or more secondary link connections.
  • At least the means for establishing, detecting, and maintaining and/or dropping comprises a network interface, and computer program code stored on a computer-readable medium and executed by at least one processor.
  • an apparatus such as a communication network base station or other network device, comprising at least one processor; and at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least: communicate over a connection with a user equipment, wherein the connection comprises a primary link connection to the user equipment and one or more secondary link connections to nodes of a same or different network; detect a radio link failure on the primary link connection; and based on determining that one or more further conditions are not present, maintain at least one of the one or more secondary link connections.
  • a method comprising: communicating, by a network node of a communication network, over a connection with a user equipment, wherein the connection comprises a primary link connection to the user equipment and one or more secondary link connections to nodes of a same or different network; detecting, by the network node, a radio link failure on the primary link connection; and based on determining that one or more further conditions are not present, maintaining at least one of the one or more secondary link connections.
  • a further example embodiment is a method comprising the method of the previous paragraph, wherein the one or more further conditions comprises one or more of: flow control feedback to the network node indicates that packets are not delivered to the user equipment over all of the one or more secondary link connections or that a number of packets delivered to the user equipment over all of the one or more secondary link connections is below a threshold, the user equipment has successfully re-established or connected to a new cell, the network node is required to exchange security key related information with the user equipment, the network node receives but is not able to deliver non-access stratum messages to the user equipment, and there is no uplink traffic received from the user equipment via the one or more secondary link connections for a predefined period; wherein detecting the radio link failure comprises detecting that expected control plane information or data is no longer being received over the primary link connection; wherein radio link failure detection is using flow control feedback based on an amount of data delivered to the user equipment over a predefined period of time for each of the primary link connection and the one or more secondary link connections, and
  • a non-transitory computer-readable medium storing program code, the program code executed by at least one processor to perform at least the method as described in the paragraphs above.
  • an apparatus comprising means for means for communicating over a connection with a user equipment, wherein the connection comprises a primary link connection to the user equipment and one or more secondary link connections to nodes of a same or different network; means for detecting a radio link failure on the primary link connection; and means, based on determining that one or more further conditions are not present, for maintaining at least one of the one or more secondary link connections.
  • At least the means for communicating, detecting, determining, and maintaining or dropping comprises a network interface, and computer program code stored on a computer- readable medium and executed by at least one processor.
  • Figure 1 shows an example of overall architecture of an 3 GPP system for multi- connectivity
  • Figure 2 shows a diagram illustrating an example of a User Equipment (UE) in partially overlapping cells
  • Figure 3 a shows radio link failure phases and impact on the RRC states
  • Figure 3b shows radio link failure detection on network side
  • Figure 4 shows a flow chart of operations in accordance with and example embodiment of the invention.
  • Figure 5 shows a high level block diagram of various devices used in carrying out various aspects of the invention.
  • Figure 6a and 6b each show a method in accordance with example embodiments of the invention which may be performed by an apparatus.
  • a new enhanced mechanism is proposed for the dual and multi-link connectivity that, in case of RLF of the primary link (e.g., the primary link can no longer be used for communication between the UE and eNB, both control and data plane), allows the UE to keep using the secondary link in place for a longer time.
  • the secondary link e.g., WLAN
  • the secondary link is only dropped, if one of several additional events on the UE and/or the eNB side is triggered. If the secondary link provides good connectivity, the primary link RLF may even go unnoticed by the user.
  • the example embodiments of the invention pertains to wireless communication with focus on Multi-RAT carrier aggregation, like for instance LTE WLAN aggregation (LWA), 4G and/or 5G multi-connectivity.
  • LWA LTE WLAN aggregation
  • 4G 4G
  • 5G 5G multi-connectivity
  • the example embodiments of the invention is realized to be at least beneficial for LWA, but is not necessarily limited to it.
  • the example embodiments can also be used to a benefit in 5G or any other radio communication technology which can include as multi- RAT network.
  • Figure 1 shows an example of a multi-point communication system which can be configured to perform the operations in accordance with the example embodiments of the invention.
  • a UE 10 connected with for communication with a primary link 130 to a 3 GPP Radio Node 13 via a 3 GPP air interface and connected with a secondary link 150 via a secondary interface (e.g., WLAN interface) to a 3GPP logical node 15 controlling the secondary link.
  • the 3 GPP Radio Node 13 is connected to the 3 GPP logical node 15 via a 3GPP RAN interface (e.g., Xw interface) over a communication path 120.
  • the 3 GPP Radio Node is also connected to the 3 GPP Core Network 12 via a 3 GPP interface 110.
  • a user equipment (UE 10) as shown in Figure 1 may be connected to more than one cell at a same time.
  • the UE 10 can be connected to a first cell 12 having a base station 13 (such as an eNB for example) and a second cell 14 having a base station 15 (such as an eNB or WLAN Access Point for example).
  • the two cells 12, 14 are, thus, at least partially overlapping.
  • the first cell may operate on a licensed band and the second one may operate on a licensed or an unlicensed band.
  • any number of cells operating on licensed and/or unlicensed band(s) may be provided to work together for suitable multi-connectivity and/or Carrier Aggregation (CA).
  • CA Carrier Aggregation
  • a UE configured to use dual or multi- link connectivity such as via another communication network (e.g. LWA) may experience an RLF because of poor quality of the LTE link.
  • LWA another communication network
  • the problem being addressed results from the fact that in current standards the UE will also drop the connectivity to the WLAN AP when the eNB releases the connectivity with the UE after detecting the RLF.
  • the quality through the WLAN link may be good enough to continue the transmission of user data through this link.
  • all the user data packets which could have been still conveyed to the UE, are also dropped with all consequences of packet re-transmission, packet forwarding and TCP slow start.
  • a similar RLF detection may run in parallel in the eNB and in the UE.
  • Phase 3a shows at the UE the phased approach of first waiting to get resynchronized (detecting in- sync indications) with the source cell.
  • This resynchronization is referred to as the "first phase” as shown in Figure 3a.
  • Phase 1 ends with expiration of timer Ti (T310) and radio link failure (RLF) declaration, which is the starting point for the "second phase” T 2 (timer T311) that is dedicated to search for any allowed cells and try to re-establish with one of these cells.
  • T310 timer Ti
  • RLF radio link failure
  • FIG. 3b shows radio problem and RLF detection on network side.
  • the eNB performs an eNB initiated UE release procedure, and the UE goes to idle and idle mobility rules according to TS 36.304 will apply and the UE must use the connection setup procedure with the network to change into the connected mode which implies to again begin to setup authentication, authorization and security on AS and NAS layers.
  • T RLF radio link failure time period
  • the eNB initiated the UE release procedure.
  • any of the radio problem detection and/or operations implemented thereafter may trigger the operations in accordance with the example embodiments of the invention as described herein.
  • the example embodiments of the invention provide a modification of the behaviour of the UE and the eNB upon RLF detection as disclosed herein, in order to maintain the WLAN link for as long as needed.
  • the embodiments of the invention are exemplarily described for the link aggregation with WLAN. It is noted that in accordance with the example embodiment the RLF detection operations may be performed multiple times and/or over a period of time.
  • multi- connectivity can consist of either a primary and multiple secondary connections or equally prioritized links in which case primary refers to the one from which the UE obeys control channel information.
  • a wireless access network 9 is adapted for communication between a user equipment UE 10 and a network node NN 12 or other access node of an access network.
  • the NN 12 can be any network device e.g., a base station that is part of or separate from the network 9.
  • the network 9 may include or may use a higher controlling node (not shown, by non-limiting example a gateway GW, a user plane entity UPE, a mobility management entity MME, or a system architecture evolution gateway SAE-GW) for operations in accordance with the example embodiments.
  • a higher controlling node may be accessible via any communication link, including the antenna 10E and/or 12E, and/or via Internet 14.
  • the UE 10 includes a data processor (DP) 10A, a memory (MEM) 10B that stores a program (PROG) IOC, and a suitable radio frequency (RF) transmitter and receiver 10D coupled to one or more antennas 10E for bidirectional wireless communications over a data link 11 with the NN 12.
  • the NN 12 also includes a DP 12 A, a MEM 12B that stores a PROG 12C, and a suitable RF transmitter and receiver 12D coupled to one or more antennas 12E.
  • the NN 12 may be coupled via a data link 13 to the internet or other broader communication network. Further, though not shown in Figure 5, the UE 10 may also be coupled to the Internet 14, such as for secondary link connections as similarly disclosed herein.
  • resource processors 10F, 12F respectively, to include instructions for processing resource connection information for optimizing traffic flow discontinuities in accordance with the example embodiments of the invention as described herein. It is noted that the proposed use of the resource processors 10F and/or 12F is non- limiting and the operations in accordance with the example embodiments of the invention as described herein may be performed using other processing devices such as DP 10A and/or DP 12A as in Figure 5. At least one of the PROGs IOC and 12C is assumed to include program instructions that, when executed by the associated DP, enable the electronic device to operate in accordance with the example embodiments of this invention as described in detail below.
  • the example embodiments of this invention may be implemented by computer software executable by the DP 10A of the UE 10 and by the DP12A of the NN 12, or other DPs, or by hardware, or by a combination of software and/or firmware and hardware.
  • the interactions between the major logical elements should be obvious to those skilled in the art for the level of detail needed to gain an understanding of the broader aspects of the invention beyond only the specific examples herein.
  • the invention may be implemented with an application specific integrated circuit ASIC, a field programmable gated array (FPGA), a digital signal processor or other suitable processor to carry out the intended function of the invention, including a central processor, a random access memory RAM, read only memory ROM, and communication ports for communicating between the NN 12 and the UE 10 as detailed above.
  • ASIC application specific integrated circuit
  • FPGA field programmable gated array
  • ROM digital signal processor
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the MEMs 10B and 12B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the DPs 10A and 12A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • general purpose computers special purpose computers
  • microprocessors microprocessors
  • DSPs digital signal processors
  • processors based on a multi-core processor architecture, as non-limiting examples.
  • At least one of the memories is assumed to tangibly embody software program instructions that, when executed by the associated processor, enable the electronic device to operate in accordance with the example embodiments of this invention, as detailed by example above.
  • the example embodiments of this invention may be implemented at least in part by computer software executable by the controller/DP of the UE 10 and/or the NN 12 by hardware, or by a combination of software and hardware.
  • Embodiments on the UE side the UE, such as the UE 10 as in Figure 5, in LWA (or any dual- or multi-link connectivity status) will not release the secondary link via WLAN and also will not go to idle.
  • the UE will keep the LWA configuration, all the connection context and the
  • the UE receives a R C Connection Reestablishment message i.e., a positive response or a RRC Connection Setup from a different cell;
  • the advantage of keeping the context and configuration is that, if re- establishment to a different cell failed and the UE goes to Idle, the UE can try to re-connect to the eNB where it experienced the RLF by performing a re-establishment procedure if the WLAN link is still running.
  • the UE can signal the capability of this new behaviour as a new IE in the UE capability so that the eNB can use the modified behaviour. If the UE has uplink traffic:
  • the UE should pick the WLAN as primary link and send traffic to the eNB;
  • - eNB can terminate the connection as described below, which will implicitly determine the UE to release the LWA as well (even without RRC signalling which is optional - see section 22A.1.7.3 in TS 36.300).
  • FIG. 4 shows a flow chart of operations in accordance with and example embodiment of the invention.
  • a UE with a primary and one or more secondary links.
  • the UE detects a radio link failure (RLF) on the primary link.
  • RLF radio link failure
  • step 430 there is determining whether any secondary link remains active or is left at the UE. If the determination is that no secondary link is left active at the UE then as shown in step 432 the operations after RLF are performed as per existing standards. If the determination is that there is a secondary link(s) left active at the UE, then as shown in step 435 there is checking for each secondary link whether extra conditions are present one or more conditions are present or still in place.
  • step 430 determines whether any other secondary link remains active or is left at the UE. If for a secondary link it is determined that there are further conditions present, then as shown in step 440 the UE drops the secondary links that have met the one or more further conditions.
  • a pre-requisite in accordance with the example embodiments of the invention can be that Xw based flow control is in place that can give a reliable feedback about the data transmitted to the UE via at least the WLAN link.
  • the eNB such as the NN 12 as in Figure 5, should continue sending data to the UE via the WLAN link and not release the UE context and LWA configuration for as long as possible or as needed.
  • the eNB should stop the transmission, release LWA and the UE context once one of the stop conditions below is fulfilled. For example:
  • Flow control feedback such as over a pre-defined period of time, suggests that the WLAN link can no longer deliver packages to UE (for example, the amount of required bits is very low or does not meet a threshold) during a predefined period of time. This can be considered as a RLF detection on a secondary link by the
  • the UE has successfully re-established or connected to another cell or a new cell e.g., an LTE cell (in the context of MRO, when the UE re-establishes after RLF the new eNB informs the old eNB via the RLF Indication message over X2 according to section 20.2.2.12 of TS 36.300. If MRO is not supported, the CN will inform the old eNB as soon as the new eNB triggers a path switch with the CN to receive the DL user data for this UE at the new eNB);
  • the eNB is required to exchange security related information with the UE, e.g. the Access Stratum or Non- Access Stratum security keys;
  • the eNB receives and is not able to deliver NAS messages to UE;
  • Timer based (a pre-defined timer value can be scaled based on the UE's mobility class (if known), the size of the mobility set configured for the UE (if any).
  • the proposed method is an optimization in terms of minimization traffic flow discontinuities, i.e., not stopping the UE from recovering from a RLF, but let the traffic flow as long as is possible without primary link. Even if the UE does not manage to re-sync with the initial cell/ re-establish to a different one, the WLAN link may still be used for delivering data to/from the UE for some time.
  • Figure 6a illustrates operations which may be performed by a device such as, but not limited to, a device (e.g., the UE 10 as in Figure 5).
  • a device e.g., the UE 10 as in Figure 5.
  • step 610 of Figure 6a there is establishing, by a user equipment, a connection to a network node of a communication network, wherein the connection comprises a primary link connection to a first network node and one or more secondary link connections to nodes of a same or different network.
  • step 620 of Figure 6a there is detecting, by the user equipment, a radio link failure on the primary link connection.
  • step 630 of Figure 6a there is based on determining that one or more further conditions are not present, maintaining at least one of the one or more secondary link connections.
  • the one or more further conditions comprises one or more of: the user equipment received an Radio Resource Control message from a different node/cell of the first network, data is no longer being received over all of the one or more secondary link connections for a predefined period, a radio link failure of all of the one or more secondary link connections is detected by the user equipment, and the network node has terminated all of the one or more secondary link connections.
  • radio link failure detection is performed at different times for each of the primary link connection and the one or more secondary link connections, and wherein determining if one or more further conditions are present is performed on a repeating basis.
  • the primary link connection is a long term evolution connection link and the at least one secondary link connection is a wireless local area network connection link.
  • a non-transitory computer-readable medium (MEM 10B of Figure 5) storing program code (PROG IOC of Figure 5), the program code executed by at least one processor (DP 10A and/or DP 10F of Figure 5) to perform the operations as at least described in the paragraphs above.
  • an apparatus comprising: means for establishing, by a user equipment (Antenna 10E, transmitter/receiver 10D of Figure 5), a connection to a network node of a communication network, wherein the connection comprises a primary link connection to a first network node [NN 12 of Figure 5 or eNB] and one or more secondary link connections to nodes of a same or different network of a communication network; means for detecting, by the user equipment [DP 10A and/or 10F, PROG IOC and MEM 10B of Figure 5], a radio link failure on the primary link connection; and means, based on determining [DP 10A and/or 10F, PROG IOC and MEM 10B of Figure 5] that one or more further conditions are not present, for maintaining at least one of the one or more secondary link connections if one or more further conditions are present.
  • At least the means for establishing, detecting, determining, and dropping or maintaining comprises a non-transitory computer readable medium [MEM 10B of Figure 5] encoded with a computer program [PROG IOC of Figure 5] executable by at least one processor [DP 10A and/or 10F of Figure 5].
  • Figure 6b illustrates operations which may be performed by a network device such as, but not limited to, a network node NN 12 as in Figure 5 or an eNB.
  • a network device such as, but not limited to, a network node NN 12 as in Figure 5 or an eNB.
  • step 650 of Figure 6b there is communicating, by a network node of a communication network, over a connection with a user equipment, wherein the connection comprises a primary link connection to the user equipment and one or more secondary link connections to nodes of a same or different network.
  • step 660 there is detecting, by the network node, a radio link failure on the primary link connection.
  • step 670 there is based on determining that one or more further conditions are not present, maintaining at least one of the one or more secondary link connections.
  • the one or more further conditions comprises one or more of: flow control feedback to the network node indicates that packets are not delivered to the user equipment over all of the one or more secondary link connections or that a number of packets delivered to the user equipment over all of the one or more secondary link connections is below a threshold, the user equipment has successfully re-established or connected to a new cell, the network node is required to exchange security key related information with the user equipment, the network node receives but is not able to deliver non-access stratum messages to the user equipment, and there is no uplink traffic received from the user equipment via the one or more secondary link connections for a predefined period.
  • detecting the radio link failure comprises detecting that expected control plane information is no longer being received over the primary link connection.
  • radio link failure detection is performed at different times for each of the primary link connection and the one or more secondary link connections, and wherein determining if one or more further conditions are present is performed on a repeating basis.
  • radio link failure detection by the apparatus is using flow control feedback based on an amount of data delivered to or received from the user equipment over said one or more secondary link connections, wherein the flow control feedback is indicating based on a threshold that an amount of data required to be delivered to or received from the user equipment during a predefined period of time is below a threshold
  • a non-transitory computer-readable medium (MEM 10B of Figure 5) storing program code (PROG 12C of Figure 5), the program code executed by at least one processor (DP 12A and/or DP 12F of Figure 5) to perform the operations as at least described in the paragraphs above.
  • an apparatus comprising: means for communicating (Antenna 12E, transmitter/receiver 12D of Figure 5), by a network node of a communication network [NN 12 of Figure 5 or eNB], over a connection with a user equipment, wherein the connection comprises a primary link connection to the user equipment and one or more secondary link connections to nodes of a same or different network; means for detecting (DP 12A, DP 12F, PROG 12C, and/or MEM 12B of Figure 5), by the network node, a radio link failure on the primary link connection; means, based on determining that one or more further conditions are not present, for maintaining (Antenna 12E, transmitter/receiver 12D, DP 12A, DP 12F, PROG 12C, and/or MEM 12B of Figure 5) at least one of the one or more secondary link.
  • At least the means for establishing, detecting, determining, and dropping or maintaining comprises a non-transitory computer readable medium [MEM 12B] encoded with a computer program [PROG 12C] executable by at least one processor [DP 12A and/or 12F].
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Embodiments of the inventions may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process. Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.
  • the word "exemplary” as may be used herein is meant to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. All of the embodiments described in this Detailed Description are exemplary embodiments provided to enable persons skilled in the art to make or use the invention and not to limit the scope of the invention which is defined by the claims.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non- exhaustive examples.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon les modes de réalisation donnés à titre d'exemple, l'invention concerne au moins un procédé et un appareil permettant de réaliser : l'établissement d'une connexion à un nœud de réseau d'un réseau de communication, la connexion comprenant une connexion de liaison primaire à un premier nœud de réseau et une ou plusieurs connexions de liaison secondaires à des nœuds d'un même réseau ou d'un réseau différent ; la détection d'une défaillance de liaison radio sur la connexion de liaison primaire (420) ; et sur la base de la détermination selon laquelle une ou plusieurs autres conditions ne sont pas présentes (435), le maintien d'au moins une desdites connexions de liaison secondaires. En outre, l'invention permet de réaliser la communication sur une connexion avec un équipement utilisateur, la connexion comprenant une connexion de liaison primaire à l'équipement utilisateur et une ou plusieurs connexions de liaison secondaires à des nœuds d'un même réseau ou d'un réseau différent ; la détection d'une défaillance de liaison radio sur la connexion de liaison primaire ; et sur la base de la détermination selon laquelle une ou plusieurs autres conditions ne sont pas présentes, le maintien d'au moins une desdites connexions de liaison secondaires.
PCT/FI2017/050032 2017-01-23 2017-01-23 Maintien d'une seconde liaison dans des opérations d'agrégation pendant une rlf de liaison primaire Ceased WO2018134470A1 (fr)

Priority Applications (1)

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PCT/FI2017/050032 WO2018134470A1 (fr) 2017-01-23 2017-01-23 Maintien d'une seconde liaison dans des opérations d'agrégation pendant une rlf de liaison primaire

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CN111565407A (zh) * 2019-02-13 2020-08-21 苹果公司 用于双连接无线装置的主小区组故障恢复
CN113498621A (zh) * 2019-02-20 2021-10-12 诺基亚技术有限公司 多ue设备的故障恢复
WO2022105634A1 (fr) * 2020-11-20 2022-05-27 华为技术有限公司 Procédé et dispositif de communication dans un réseau local sans fil

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US20150049707A1 (en) * 2013-08-16 2015-02-19 Qualcomm Incorporated Techniques for managing radio link failure recovery for a user equipment connected to a wwan and a wlan
US20160338137A1 (en) * 2015-05-14 2016-11-17 Intel IP Corporation Performing primary cell functions in a secondary cell
US20160366720A1 (en) * 2015-06-10 2016-12-15 Htc Corporation Device and Method of Aggregating LTE System and WLAN

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US20150049707A1 (en) * 2013-08-16 2015-02-19 Qualcomm Incorporated Techniques for managing radio link failure recovery for a user equipment connected to a wwan and a wlan
US20160338137A1 (en) * 2015-05-14 2016-11-17 Intel IP Corporation Performing primary cell functions in a secondary cell
US20160366720A1 (en) * 2015-06-10 2016-12-15 Htc Corporation Device and Method of Aggregating LTE System and WLAN

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Publication number Priority date Publication date Assignee Title
CN111565407A (zh) * 2019-02-13 2020-08-21 苹果公司 用于双连接无线装置的主小区组故障恢复
CN111565407B (zh) * 2019-02-13 2024-01-12 苹果公司 用于双连接无线装置的主小区组故障恢复
CN113498621A (zh) * 2019-02-20 2021-10-12 诺基亚技术有限公司 多ue设备的故障恢复
WO2022105634A1 (fr) * 2020-11-20 2022-05-27 华为技术有限公司 Procédé et dispositif de communication dans un réseau local sans fil

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