WO2018169461A1 - Mobilité non préparée dans un système de communication mobile - Google Patents

Mobilité non préparée dans un système de communication mobile Download PDF

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Publication number
WO2018169461A1
WO2018169461A1 PCT/SE2017/050256 SE2017050256W WO2018169461A1 WO 2018169461 A1 WO2018169461 A1 WO 2018169461A1 SE 2017050256 W SE2017050256 W SE 2017050256W WO 2018169461 A1 WO2018169461 A1 WO 2018169461A1
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WO
WIPO (PCT)
Prior art keywords
establishment
user equipment
conditions
node
information
Prior art date
Application number
PCT/SE2017/050256
Other languages
English (en)
Inventor
Stefan Engström
Emil Pettersson
Niclas PALM
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2017/050256 priority Critical patent/WO2018169461A1/fr
Publication of WO2018169461A1 publication Critical patent/WO2018169461A1/fr

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Classifications

    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength

Definitions

  • the proposed technology generally relates to methods and devices for enabling mobility in a mobile communication system.
  • LTE Long Term Evolution
  • UE User Equipment
  • eNBs radio access nodes
  • eNB l When a UE experiences a radio link failure to the serving eNB, here denoted eNB l, it may try to re-establish the connection in the same or another cell.
  • eNB2 When the new cell is controlled by a second eNB, eNB2, eNB2 needs to retrieve the UE context from eNB 1.
  • Narrow Band Internet-of-Things is an addition to the legacy LTE specifications. It is introduced to support UEs with lower requirements on delay and bitrates. NB-loT shall also support a very low power consumption by and lower cost of the UEs.
  • the NB-loT UEs do not support any measurement reporting to a serving eNB nor handover for mobility between cells.
  • the NB-loT UE though supports re-establishment to an eNB in case of radio link failure.
  • a method for managing user equipment connections in a mobile radio communication system comprises obtaining of a determination of that re-establishment conditions for a user equipment are fulfilled, and initializing of a re-establishment for the user equipment as a response to the obtaining of the determination.
  • the determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • a method for managing user equipment connections in a mobile radio communication system comprises receiving, in a user equipment, from a radio node to which the user equipment is connected, of a command for re-establishment.
  • a target cell of a target radio node to which a re-establishment is to be performed is determined.
  • a re-establishment to the target cell of the target radio node is initialized.
  • a method for assisting in managing user equipment connections in a mobile radio communication system comprises performing, in a radio node, of a re- establishment process of a user equipment.
  • Information about a result of the re-establishment process is provided to a node managing re-establishment conditions.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re- establishment process for the user equipment.
  • a method for assisting in managing user equipment connections in a mobile radio communication system comprises receiving of information about a result of a re- establishment process of a user equipment.
  • Re-establishment conditions are adjusted in dependence of the information about the result of the re- establishment process.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which he user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • Adjusted re- establishment conditions are provided to a node in the mobile radio communication system.
  • a node configured to managing user equipment connections in a mobile radio communication system.
  • the node is configured to obtain a determination of that re-establishment conditions for a user equipment are fulfilled. The determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • the node is further configured to initialize a re- establishment for the user equipment as a response to the obtaining of the determination.
  • a user equipment configured to be connected to a mobile radio communication system.
  • the user equipment is configured to receive, from a radio node to which the user equipment is connected, a command for re-establishment.
  • the user equipment is further configured to determine a target cell of a target radio node to which a re- establishment is to be performed.
  • the user equipment is further configured to initialize a re-establishment to the target cell of the target radio node.
  • a radio node for assisting in managing user equipment connections in a mobile radio communication system.
  • the radio node is configured to perform a re-establishment process of a user equipment.
  • the radio node is further configured to provide information about a result of the re-establishment process to a node managing re-establishment conditions.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • a network node for assisting in managing user equipment connections in a mobile radio communication system.
  • the network node is configured to receive information about a result of a re-establishment process of a user equipment.
  • the network node is further configured to adjust re-establishment conditions in dependence of the information about the result of the re-establishment process.
  • the re- establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • the network node is further configured to provide adjusted re-establishment conditions to a node in the mobile radio communication system.
  • a computer program comprising instructions, which when executed by at least one processor, cause the processor(s) to obtain a determination of that re-establishment conditions for a user equipment are fulfilled.
  • the determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • the instructions when executed by the processor(s), further cause the processor(s) to initialize a re-establishment for the user equipment as a response to the obtaining of the determination.
  • a computer program comprising instructions, which when executed by at least one processor, cause the processor(s) to receive from a radio node, a command for re-establishment.
  • the instructions when executed by the processor(s), further cause the processor(s) to determine a target cell of a target radio node to which a re- establishment is to be performed.
  • the instructions when executed by the processor(s), further cause the processor(s) to initialize a re-establishment to the target cell of the target radio node.
  • a computer program comprising instructions, which when executed by at least one processor, cause the processor(s) to perform a re-establishment process of a user equipment.
  • the instructions when executed by the processor(s), further cause the processor(s) to provide information about a result of the re- establishment process to a node managing re-establishment conditions.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • a computer program comprising instructions, which when executed by at least one processor, cause the processor(s) to receive information about a result of a re-establishment process of a user equipment.
  • the instructions when executed by the processor(s), further cause the processor(s) to adjust re-establishment conditions in dependence of the information about the result of the re- establishment process.
  • the re-establishment conditions which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re- establishment process for the user equipment.
  • the instructions when executed by the processor(s), further cause the processor(s) to provide adjusted the re-establishment conditions to a node in the mobile radio communication system.
  • a computer-program product comprising a computer-readable medium having stored thereon a computer program of any of the ninth to twelfth aspects.
  • a carrier comprising the computer program of any of the ninth to twelfth aspects, wherein the carrier is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  • a node for managing user equipment connections in a mobile radio communication system.
  • the node comprises a re-establishment surveillance module for obtaining a determination of that re-establishment conditions for a user equipment are fulfilled. The determination is performed as a comparison between the re- establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • the node further comprises a re-establishment initializing module for initializing a re-establishment for the user equipment as a response to the obtaining of the determination.
  • a user equipment there is provided a user equipment.
  • the user equipment comprises a receiver for receiving, from a radio node to which the user equipment is connected, a command for re-establishment.
  • the user equipment further comprises a target determining module for determining a target cell of a target radio node to which a re-establishment is to be performed.
  • the user equipment further comprises a re-establishment module for initializing a re-establishment to the target cell of the target radio node.
  • a radio node for assisting in managing user equipment connections in a mobile radio communication system.
  • the radio node comprises a re-establishment module for performing a re-establishment process of a user equipment.
  • the radio node further comprises a communication module for providing information about a result of the re-establishment process to a node managing re-establishment conditions.
  • the re-establishment conditions being conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re- establishment process for the user equipment.
  • a network node for assisting in managing user equipment connections in a mobile radio communication system.
  • the network node comprises a receiver for receiving information about a result of a re-establishment process of a user equipment.
  • the network node further comprises a re-establishment condition handler module for adjusting re-establishment conditions in dependence of the information about the result of said re-establishment process.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • the network node further comprises a re-establishment condition provider module for providing adjusted re-establishment conditions to a node in the mobile radio communication system.
  • An advantage of the proposed technology is that it provides the possibility for fast mobility for NB-loT UEs, without the need to implement a handover procedure.
  • Fig. l is an illustration of a LTE architecture showing logical interfaces between eNBs (X2) and between eNB and MME/S-GW (S I);
  • Fig. 2 is an example showing a UE moving between two cells controlled by different eNBs
  • Fig. 3 is an illustration of an existing procedure for handover between two cells in different eNBs
  • Fig. 4 is an illustration of an existing procedure for re-establishment of radio connection in a new cell controlled by a second eNB;
  • Fig. 5 is an illustration of steps of an embodiment of a method for a node for managing user equipment connections in a mobile radio communication system:
  • Fig. 6 is an illustration of steps of an embodiment of a method for a UE for managing user equipment connections in a mobile radio communication system
  • FIG. 7 in an illustration of steps of an embodiment of a method for assisting in managing user equipment connections in a mobile radio communication system
  • Fig. 8 is an illustration of steps of an embodiment of a method for assisting in managing user equipment connections in a mobile radio communication system
  • Fig. 9 is a schematic illustration of a mobile radio communication system 1 and a UE 20 connected thereto;
  • Fig. 10 illustrates an embodiment of a system level process for managing user equipment connections in a mobile radio communication system
  • Fig. 1 1 is a flowchart illustrating an embodiment when a connection is reestablished in a same cell
  • Fig. 12 is a signaling scheme of an embodiment when a connection is reestablished in a same cell
  • Fig. 13 is a flowchart illustrating an embodiment of a method in a radio node when the connection is re-established in another cell
  • Fig. 14 is a flowchart illustrating a corresponding embodiment in a radio node to which the connection is re-established in another cell;
  • Fig. 15 is a signaling scheme of an embodiment when a connection is reestablished in another cell
  • Fig. 16 is a signaling scheme of another embodiment when a connection is reestablished in another cell
  • Fig. 17A is a schematic block diagram of an embodiment of a node
  • Fig. 17B is a schematic block diagram of an embodiment of a user equipment
  • Fig. 17C is a schematic block diagram of an embodiment of a radio node
  • Fig. 17D is a schematic block diagram of an embodiment of a network node
  • Fig. 18A is a schematic block diagram illustrating another embodiment of a node
  • Fig. 18B is a schematic block diagram illustrating another embodiment of a user equipment
  • Fig. 18C is a schematic block diagram illustrating another embodiment of a radio node
  • Fig. 18D is a schematic block diagram illustrating another embodiment of a network node
  • Fig. 19A is a schematic block diagram illustrating yet another embodiment of a node
  • Fig. 19B is a schematic block diagram illustrating yet another embodiment of a user equipment
  • Fig. 19C is a schematic block diagram illustrating yet another embodiment of a radio node
  • Fig. 19D is a schematic block diagram illustrating yet another embodiment of a network node
  • Fig. 20 is a schematic diagram illustrating an example of a computer- implementation according to an embodiment of a node, a user equipment, a radio node or a network node;
  • Fig. 21 is a schematic block diagram illustrating an embodiment of a network device
  • Fig. 22A is a schematic diagram illustrating an embodiment of a node
  • Fig. 22B is a schematic diagram illustrating an embodiment of a user equipment
  • Fig. 22C is a schematic diagram illustrating an embodiment of a radio node
  • Fig. 22D is a schematic diagram illustrating an embodiment of a network node
  • Fig. 23 is a schematic diagram illustrating an example of how functionality can be distributed or partitioned
  • Fig. 24 is a schematic diagram illustrating an example of a wireless communication system.
  • Fig. 25 illustrates radio control functions in a centralized computing environment.
  • the third generation partnership project (3 GPP) is currently working on standardization of the Evolved Universal Terrestrial Radio Access Network (E- UTRAN) radio access system, also called LTE, and also the evolution of this system into the 5th generation radio access system, also called New Radio (NR).
  • E- UTRAN Evolved Universal Terrestrial Radio Access Network
  • NR New Radio
  • LTE is part of the Evolved Packet System (EPS), also constituting the Evolved Packet Core (EPC) .
  • EPS Evolved Packet System
  • EPC Evolved Packet Core
  • a mobile communication system 1 in this particular example an EPS 2, comprises a number of radio nodes 30, in this example eNBs 36, and network nodes 40 comprising a Mobility Management Entity (MME) 41 and/ or a Serving Gateway (S-GW) 42.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • the interface 31 between eNBs 36 is referred to as X2, and the interface 32 between eNB 36 and MME/ S-GW 41, 42 is denoted S I .
  • the signaling transport over X2 and S I are implemented via Stream Control Transmission Protocol (SCTP).
  • SCTP Stream Control Transmission Protocol
  • the eNBs 36 are considered as parts of the E-UTRAN 15.
  • Fig. 2 illustrates two radio nodes 30A and 30B, each of which having a number of cells 13A, 13B, in which the respective radio node 30A, 30B provides radio coverage at most occasions.
  • a UE 20 may move from one cell to another, either between cells controlled by a same radio access node or between cells controlled by different radio nodes. In other words, with the handover, the connection is moved between different cells 13A, 13B, controlled by the same or different radio nodes 30A, 30B
  • FIG. 3 an illustration of an existing procedure for handover between two cells associated with different radio nodes 30, in this example eNBs 36A, 36B is shown.
  • the eNB l 36A and eNB2 36B broadcast respective reference symbols, T01, T02.
  • the UE receives the signals and can deduce measures of signal strengths from the different radio access nodes.
  • the UE is connected T03 to eNB l .
  • the UE 20 decides T04 to send a measurement report T05 to the serving eNB l 36A, in which the respective signal strengths to the eNBs 36A, 36B are represented.
  • the eNB l 36A may then, based on the measurement report, detect that it would be more beneficial if the UE 20 was connected to eNB2 36B instead and decide T06 to initiate a handover.
  • a Handover Request T07 is sent from the eNB l 36A to eNB2 36B.
  • the eNB2 36B replies back to eNB l 36A on the request by a Handover Request Acknowledge T08.
  • eNB l 36A subsequently issues an RRC Connection Reconfiguration T09 sent to the UE 20.
  • the UE 20 connects T50 to eNB2 36B and the user plane is re-routed T51.
  • FIG. 4 is an illustration of an existing procedure for re-establishment of radio connection in a new cell controlled by a second eNB.
  • reference symbols are broadcasted TO l, T02 from eNBs 36A, 36B and received by a UE 20 that decides to connect T03 to eNB l 36A.
  • the radio link between the UE 20 and eNB l 36A fails T10. This means that there are no possibilities at all for direct communication between the UE 20 and the eNB l 36A and thus a handover is not possible.
  • the UE 20 decides T l 1 to connect to another cell, preferably the best cell, as judged from the latest received broadcast signals. To this end, the UE 20 sends T12 a Re-establishment Request to eNB2 36B.
  • the eNB2 36B receives the request and concludes that the UE 20 previously was connected to eNB l 36A.
  • eNB2 36B sends T13 a UE Context Request to eNB l 36A, which replies T 14 with a UE Context Response.
  • the connection T50 of the UE 20 to eNB2 36B can thereby be effected.
  • the user plane is re-routed T51.
  • the re-establishment to an eNB in case radio link failure e.g. according to Fig. 4
  • radio link failure e.g. according to Fig. 4
  • the eNB from which the UE moves achieves information of that a change is in progress, but no information about the resulting connection is provided from the new eNB.
  • the here presented technology introduces a method to trigger the UE to start a re-establishment to the strongest cell on a specified frequency.
  • the technology also introduces a method to optimize the conditions when to trigger a re-establishment to a stronger cell.
  • the here presented technology enables the radio access node or any node connected thereto to have the possibility to order a UE to search for the strongest cell available. If the UE does not find a stronger cell than the present cell, Celll, it will immediately re-establish to Celll . This re-establishment is fast enough to keep the context and to prohibit the UE to go idle and need to connect again. If the UE finds a stronger cell, Cell2, it will immediately reestablish to Cell2. The short, within a few seconds, interrupt caused by such a re-establishment will not have any effect on a delay-insensitive service, but gives the radio network the possibility to fast move a UE in bad operation conditions, e.g. radio conditions, to a better cell, without the need to introduce a handover procedure.
  • bad operation conditions e.g. radio conditions
  • the present technology also provides feedback to a radio access node, or any node connected thereto, e.g. an eNB, for optimization of the trigger conditions for ordering the search for strongest cell.
  • a radio access node or any node connected thereto, e.g. an eNB, for optimization of the trigger conditions for ordering the search for strongest cell.
  • Fig. 5 illustrates steps of an embodiment of a method for managing user equipment connections in a mobile radio communication system.
  • step S I a determination of that re-establishment conditions for a user equipment are fulfilled is obtained. The determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • step S2 a re-establishment is initialized for the user equipment as a response to the obtaining of the determination.
  • Fig. 6 illustrates the procedures in the UE concerning the re-establishment.
  • the UE receives a command to perform a re-establishment, typically to the strongest cell on a specified frequency.
  • the UE searches for the strongest cell that fulfills the selection criteria.
  • the UE performs the re-establishment in the selected cell.
  • Fig. 6 illustrates steps of an embodiment of a method for managing user equipment connections in a mobile radio communication system.
  • step S 101 a command for re-establishment is received in a user equipment from a radio node to which the user equipment is connected.
  • step S 102 a target cell of a target radio node to which a re- establishment is to be performed is determined.
  • the step S 102 of determining a target cell of a target radio node comprises selecting of a cell of a radio node presenting a highest signal strength as the target cell of the target radio node.
  • step S 103 a re- establishment to the target cell of the target radio node is initialized.
  • the command for re-establishment comprises a representation of a target frequency on which the re-establishment is recommended to be performed.
  • Step S 103 then comprises selecting of a target cell of a target radio node using the target frequency.
  • Fig. 7 illustrates steps of an embodiment of a method for assisting in managing user equipment connections in a mobile radio communication system.
  • step S201 a re-establishment process of a user equipment is performed in a radio node.
  • step S206 information about a result of the re-establishment process is providing to a node managing re- establishment conditions.
  • the re-establishment conditions are conditions, which when being fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • Fig. 8 illustrates steps of an embodiment of a method for assisting in managing user equipment connections in a mobile radio communication system.
  • step S301 information about a result of a re-establishment process of a user equipment is received.
  • step S302 the re-establishment conditions are adjusted in dependence of the information about the result of the re-establishment process.
  • the re- establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • the information about the result of the re-establishment process of a user equipment comprises information about operation conditions between the user equipment and a cell of a radio node, to which the re-establishment was performed
  • the re-establishment conditions are adjusted in dependence of such information about operation conditions.
  • adjusted re- establishment conditions are provided to a node in the mobile radio communication system.
  • the use of the re-establishment conditions aims for having a re-establishment procedure in which a request for re-establishment is performed when there is a benefit from making a re-establishment.
  • the re- establishment conditions should be set so that unnecessary re- establishments to the same cell again are avoided, i.e. when the present cell still is the best option. Therefore, in a preferred embodiment, the step S302 of adjusting re-establishment conditions in turn comprises at least one of two options.
  • the first option is to make the re-establishment conditions more restrictive as a response of the information about a result of a re- establishment process of a user equipment being information about that the re-establishment resulted in re-establishment to the same cell to which the user equipment was connected before the re-establishment.
  • the second option is to make the re-establishment conditions less restrictive as a response of the information about a result of a re-establishment process of a user equipment being information about that the re-establishment resulted in re-establishment to another cell, providing better connection characteristics, different from the one to which the user equipment was connected before the re-establishment.
  • the determination of whether or not the re-establishment conditions are fulfilled, the initiation of the re-establishment command and the actual performance of the re-establishment are main contributions to the here described technology. Furthermore, collection of information from the performed re-establishment and adjusting of the re-establishment conditions accordingly are other advantageous contributions. Most of these different part contributions can individually be performed at different physical or logical locations within the communication network. They all contribute with a technical contribution to the overall benefit of the user of the communication network. Some of these aspects will be discussed in connection with Fig. 9.
  • Fig. 9 is a schematic illustration of a mobile radio communication system 1 and a UE 20 connected thereto.
  • the UE 20 may communicate with different radio nodes 30 in the mobile radio communication system 1.
  • the radio nodes 30 are thus the nodes directly responsible for the radio contact 12 with the UEs 20.
  • the mobile radio communication system 1 is also illustrated to comprise a connection control node 43 and a condition manager node 44.
  • the condition manager node 44 is the node that is responsible for creating and possibly also adjusting the re-establishment conditions.
  • the connection control node 43 is the node responsible for the determination of whether or not the re-establishment conditions are fulfilled. In this figure, the connection control node 43 and the condition manager node 44 are illustrated as separate nodes.
  • connection control node 43, the condition manager node 44 and the radio nodes 30 are all examples of network nodes 40.
  • the connection control node 43, the condition manager node 44, the radio nodes 30 and the UE 20 are furthermore all examples of nodes 10 in a more general aspect.
  • the steps S I and S2 of Fig. 5 can be performed in any node 10.
  • the obtaining of the determination of step S I may be implemented as the actual determination itself.
  • the obtaining of the determination of step S I may typically be implemented as receiving of the results of the determination from the connection control node 43.
  • the steps S 1 and S2 of Fig. 5 are implemented in a network node 40.
  • the initializing of a re- establishment comprises initializing a sending of a command for re- establishment to the user equipment from the radio node of the mobile radio communication system to which said user equipment is connected.
  • the step S2 can be implemented in the radio node 30, and the initializing of a re-establishment is then typically triggering the actual sending of the command for re-establishment to the user equipment.
  • the steps S I and S2 of Fig. 5 can also be performed in the UE 20.
  • the step S I of obtaining a determination comprises three part steps.
  • signalling representing the re-establishment conditions is received in the UE from the radio node of the mobile radio communication system to which the user equipment is connected. This is preferably performed together with the procedures when the UE originally connects to the radio node. Such information gives the UE a decision support based on the current situation in the mobile radio communication system 1.
  • the second part step of this embodiment comprises deducing of the present operation conditions in the UE.
  • the third part step is the actual comparing, in the UE, of the deduced present operation conditions with the re-establishment conditions.
  • the command for re-establishment may comprise additional material to be communicated to the UE.
  • One example may a representation of a target frequency on which the re-establishment is recommended to be performed.
  • steps S201, S206, S301-S303 of Figs. 7 and 8 can also be implemented in any network node 40.
  • steps S I and S2 of Fig. 5 there are the additional steps of obtaining information about a result of the re-establishment process and initializing an adjustment of the re-establishment conditions in dependence of the information about the result of the re-establishment process.
  • the results of the re-establishment process comprise at least one of two types of information.
  • the first type is information about whether or not the re-establishment resulted in re-establishment to the same cell to which the user equipment was connected before the re-establishment. This may assist in deciding if the re-establishment procedure was unnecessary to perform or not, which can be utilized for adjusting the restriction of the re-establishment conditions.
  • the second type is information on operation conditions between the user equipment and a cell, different from the cell to which the user equipment was connected before the re- establishment, to which the re-establishment was performed. Such information provides knowledge about the situation experienced by the UE. In a typical case, such operation conditions comprise radio connection characteristics. This can also be used for adjustment purposes, and typically on an even more detailed level.
  • this step may comprise the actual deriving of the information about a result of the re- establishment process.
  • the step of initializing an adjustment of the re- establishment conditions is performed in a condition manager node 44
  • this initializing is typically followed by a step e.g. according to S302 of Fig. 8.
  • the re-establishment conditions are re-establishment conditions adjusted in dependence of information about results of previous re-establishment processes.
  • the results of previous re-establishment processes comprise information about whether or not the previous re-establishment resulted in re-establishment to the same cell to which the user equipment was connected before the previous re-establishment and/or information on operation conditions between the user equipment and a radio node having a cell to which the previous re-establishment was performed.
  • Fig. 10 illustrates an embodiment of a system level process for managing user equipment connections in a mobile radio communication system. Steps SI and S2 are described earlier. If the re-establishment is performed to the same cell as the UE already was connected to, the process continues to step S30, where information about that re-establishment has been performed in this manner is obtained. In step S40, an adjustment of conditions in dependence on the re-establishment information is initialized. If the re-establishment is performed to a new cell, operation conditions, e.g. radio connection characteristics, are exchanged with the radio node of the new cell. In step S50, information on operation conditions between the UE and a radio node is obtained. In step S60, adjustment of conditions in dependence on the operation conditions is initialized.
  • operation conditions e.g. radio connection characteristics
  • steps S30, S40, S50 and S60 can in particular embodiments be performed in the same node as the steps S I and S2. However, in alternative embodiments, one or several of the steps S30, S40, S50 and S60 can be performed by other nodes within the network or in a cloud, which will be discussed further below.
  • the determination is in one embodiment based on the present operation conditions as deduced in the mobile radio communication system to which the user equipment is connected. The determination is thus based on a comparison of the deduced present operation conditions with the re- establishment conditions.
  • the operation conditions may in one embodiment comprise radio conditions and/or traffic conditions.
  • Non-exclusive examples of possible radio conditions may be conditions comprising measures related to at least one of signal strength of an uplink channel from said user equipment, noise level in an uplink channel from said user equipment, transmitting power of downlink signalling to said user equipment, signalling propagation time to and/or from said user equipment, directional information of signalling to and/or from said user equipment.
  • Non-exclusive examples of possible traffic conditions may be measures of timing advance (for a UE), source cell load, source node load, UE throughput in the source cell (might at least partly be regarded as a radio condition), number of connected UE's in the cell/ node, number of HARQ retransmissions.
  • the operation conditions comprise measures related to a signal strength of a downlink channel, a noise level in a downlink channel, transmission bitrate in a downlink and / or uplink channel and / or transmitting power of uplink signalling.
  • the re-establishment conditions may in one embodiment be further dependent on other inputs.
  • such inputs can be a time since a latest previous re-establishment and/or a number of latest consecutive previous re-establishments that has not resulted in any change of cell for the user equipment.
  • the re-establishment conditions may be constituted in many different ways.
  • the conditions can be based on criteria where operation conditions are compared with set threshold levels. If several operation condition measures are used, the threshold levels for each of the measures can be separate or coupled.
  • n different operation conditions can be considered to span an n-dimensional measurement space. Measurements of a particular operation condition then corresponds to a measurement point in the n-dimensional space.
  • the re- establishment conditions could then be defined as a condition surface in the n-dimensional space and re-establishment is to be initialized if the measurement point falls outside the condition surface in the n-dimensional space.
  • An adjustment of the re-establishment conditions then corresponds to a re-definition of the condition surface.
  • Fig. 11 illustrates an embodiment where a radio node commands the UE, served in a first cell, to perform a re-establishment and where the connection is reestablished in the same first cell.
  • the step S I comprises a number of part steps.
  • step S10 re-establishment conditions for triggering a re-establishment is obtained from another node or is configured internally in the radio node.
  • step S I 1 the UE is connected to the first cell, which is controlled by the radio node. UL and/or DL transmissions are performed.
  • step S 12 operation conditions are compared to the re-establishment conditions to determine if the re-establishment conditions are fulfilled.
  • Step S2 is in this embodiment performed in the radio node and is therefore a part of step S3, in which a re-establishment command for the UE is sent.
  • the radio node receives a re- establishment request from the UE.
  • the connection to the UE is re-established.
  • the radio node receives information about the re-establishment. This information comprises typically information about that the re-establishment is performed to the same cell as before and/or information about operation conditions, e.g. radio connection characteristics, between the UE and the radio node.
  • the radio node can then use the fact that the UE re-establishes to the same cell for tuning the conditions for triggering a re-establishment.
  • step S9 information for adjusting re-establishment conditions is sent to the node managing the re-establishment conditions in dependence of the result of the re-establishment process. If the radio node itself manages the re- establishment conditions, the step S9 comprises adjusting re-establishment conditions internally in dependence of the result of the re-establishment process.
  • FIG. 12 A signaling situation of a similar embodiment is illustrated in Fig. 12.
  • reference symbols are broadcast from eNBs 36A, 36B and detected by the UE 20.
  • the UE 20 decides to connect to eNB l 36A, which is performed at T03.
  • eNB l 36A a decision to command a re-establishment is made in eNB l 36A, and at T22, the re-establishment is initialized.
  • a re-establishment command is sent from the eNB l 36A to the UE 20 at T25.
  • the UE 20 selects the strongest cell, preferably on a frequency specified in the command.
  • a re-establishment request is sent from the UE 20 to the eNB l 36A at T27.
  • the UE 20 performs a reconnection to the eNB l 36A at T52.
  • the eNB l 36A adjusts the re-establishment conditions.
  • Fig. 13 illustrates an embodiment where eNB l commands the UE, served in a first cell, to perform a re-establishment and where the connection is reestablished in a second cell controlled by eNB2. Steps S I, S2 and S3 are the same as was described above.
  • the controlling radio node eNB2 needs some information from the earlier radio node.
  • eNB2 requests the UE context from eNB l .
  • a context request is received in the old radio node, i.e. eNBl, from another radio node, i.e. eNB2.
  • eNBl sends UE context to the other radio node, eNB2.
  • the other radio node i.e. eNB2
  • information about the re-establishment is received in the eNB l .
  • This step comprises the part step S81 of receiving information on operation conditions from the other node, i.e. eNB2.
  • the eNB l can then use the fact that the UE re-establishes in the second cell, and the information on e.g. the radio characteristics, for tuning the conditions for triggering a re-establishment.
  • information for adjusting re-establishment conditions is sent to the node managing the re- establishment conditions in dependence of the result of the re-establishment process.
  • the step S9 comprises adjusting re-establishment conditions internally in dependence of the result of the re-establishment process.
  • eNB 1 can add the second cell2 as a neighbor to the first cell.
  • Fig. 14 illustrates the corresponding processes as performed in eNB2.
  • the step S201 of performing a re-establishment process of a UE comprises some parts steps.
  • eNB2 receives a request for re-establishment in the second cell from the UE.
  • eNB2 retrieves the UE context from eNB l .
  • a context request is in step S203 sent to eNB l, i.e. the radio node to which the UE was connected before.
  • UE context is received from eNB l .
  • the eNB2 can then re-establish the connection to the UE, as in step S205.
  • eNB2 also preferably sends information on e.g. characteristics of the radio connection to the UE. If the eNB l manages the re-establishment conditions, this information is sent to eNB 1 , otherwise the information is sent to the node managing the re-establishment conditions.
  • step S206 information about a result of the re-establishment process is provided to a node managing re-establishment conditions.
  • step S206 comprises the part step of sending information on operation conditions to the radio node to which the UE was connected before.
  • Fig. 15 summarizes signaling in connection with an embodiment of such a procedure.
  • the eNBs 36A, 36B periodically at T01, T02 broadcast reference symbols which the UE 20 can measure to estimate signal power and quality.
  • the UE 20 is connected to eNB l 36A in the first cell, at T03.
  • eNB l 36A takes a decision to order the UE to perform a re- establishment, based on configured criteria, or in other words makes a decision to command a re-establishment.
  • the eNBl 36A initializes the re-establishment, and at T25, a re-establishment demand is sent from eNB l 36A to the UE 20.
  • the UE 20 performs a cell search to find the strongest cell on the specified frequency and initiates a re-establishment to the selected cell by sending a re-establishment request to eNB2 36B, at T27.
  • the eNB2 36B retrieves the UE context from eNB l 36A, by, at T28, sending a UE context request.
  • the eNB 1 36A replies by sending a UE context response back to the eNB2 36B, at T29.
  • the re-establishment is completed with the UE 20 connecting to eNB2 36B, at T50, and in one embodiment, at T51, the user plane is re-routed.
  • T53 information on the operation conditions is sent from eNB2 36B to eNB l 36A.
  • the information is used at T54 to tune the criteria for triggering a re- establishment, i.e. to adjust re-establishment conditions.
  • Fig. 16 illustrates signaling when a network node other than the involved radio nodes is responsible for checking the re-establishment criteria and/or for creating and adjusting them. Several parts of the signaling is the same as discussed earlier and will not be discussed again.
  • a connection control node 43 and a condition manager node 44 are illustrated. These nodes may be separate nodes or as indicated by the dotted box be comprised in the same network node 40.
  • the condition manager node 44 supplies re-establishment conditions to the connection control node 43. These re-establishment conditions are preferably updated by assistance of the results of earlier re-establishment procedures.
  • the connection control node 43 takes at T21 the decision to command a re-establishment.
  • the re-establishment is initialized by the connection control node 43 by asking the eNB l 36A to send a re- establishment command to the UE 20.
  • the eNB l 36A sends such a re-establishment command.
  • the re-establishment procedure then proceeds according to similar operations as was presented in connection with Fig. 15.
  • eNB2 36B sends operation condition information to the condition manager node 44, which at T54 adjusts the re-establishment conditions accordingly.
  • the first and second cells have in the embodiments presented above been illustrated as controlled by different radio nodes. However, the first and second cells may in other embodiments be controlled by the same radio node.
  • the non-limiting terms "User Equipment (UE)", “station (STA)” and “wireless communication device” may refer to a mobile phone, a cellular phone, a Personal Digital Assistant (PDA) equipped with radio communication capabilities, a smart phone, a laptop or Personal Computer (PC) equipped with an internal or external mobile broadband modem, a tablet PC with radio communication capabilities, a target device, a device to device UE, a machine type UE or UE capable of machine to machine communication, iPAD, Customer Premises Equipment (CPE), Laptop Embedded Equipment (LEE), Laptop Mounted Equipment (LME), Universal Serial Bus (USB) dongle, a portable electronic radio communication device, a sensor device equipped with radio communication capabilities or the like.
  • PDA Personal Digital Assistant
  • smart phone a laptop or Personal Computer
  • PC Personal Computer
  • PC Personal Computer
  • a tablet PC with radio communication capabilities a target device
  • a device to device UE a machine type UE or UE capable of machine to machine communication
  • UE User Equipment
  • Station and the term “wireless communication device” should be interpreted as non-limiting terms comprising any type of wireless device communicating with a network node in a wireless communication system and/ or possibly communicating directly with another wireless communication device.
  • a wireless communication device may be any device equipped with circuitry for wireless communication according to any relevant standard for communication.
  • the term “wired device” may refer to any device configured or prepared for wired connection to a network.
  • the wired device may be at least some of the above devices, with or without radio communication capability, when configured for wired connection.
  • network node may refer to radio nodes, base stations, access points, network control nodes such as network controllers, radio network controllers, base station controllers, access controllers, and the like.
  • radio node may encompass different types of radio base stations including standardized base stations such as Node Bs, or evolved Node Bs (eNB) and also macro/ micro/ pico radio base stations, home base stations, also known as femto base stations, relay nodes, repeaters, radio access points, Base Transceiver Stations (BTS), and even radio control nodes controlling one or more Remote Radio Units (RRU), or the like.
  • communication unit includes network nodes and/or associated wireless devices.
  • network device may refer to any device located in connection with a communication network, including but not limited to devices in access networks, core networks and similar network structures.
  • the term network device may also encompass cloud-based network devices.
  • embodiments may be implemented in hardware, or in software for execution by suitable processing circuitry, or a combination thereof.
  • At least some of the steps, functions, procedures, modules and/ or blocks described herein may be implemented in software such as a computer program for execution by suitable processing circuitry such as one or more processors or processing units.
  • processing circuitry includes, but is not limited to, one or more microprocessors, one or more Digital Signal Processors (DSPs), one or more Central Processing Units (CPUs), video acceleration hardware, and/ or any suitable programmable logic circuitry such as one or more Field Programmable Gate Arrays (FPGAs), or one or more Programmable Logic Controllers (PLCs).
  • DSPs Digital Signal Processors
  • CPUs Central Processing Units
  • FPGAs Field Programmable Gate Arrays
  • PLCs Programmable Logic Controllers
  • a node configured to managing user equipment connections in a mobile radio communication system.
  • the node is configured to obtain a determination of that re-establishment conditions for a user equipment are fulfilled.
  • the determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • the node is further configured to initialize a re-establishment for the user equipment as a response to the obtaining of the determination.
  • Fig. 17A is a schematic block diagram illustrating an example of a node 10, based on a processor-memory implementation according to an embodiment.
  • the node 10 comprises a processor 1 10 and a memory 120.
  • the memory 120 comprises instructions executable by the processor 1 10, whereby the processor is operative to obtain said determination and to initialize said re-establishment for said user equipment.
  • the node 10 may also include a communication circuit 130.
  • the communication circuit 130 may include functions for wired and/or wireless communication with other devices and/or network nodes in the network. In a particular example, the communication circuit 130 may be based on radio circuitry for communication with one or more other nodes, including transmitting and/or receiving information.
  • the communication circuit 130 may be interconnected to the processor 1 10 and/or memory 120.
  • the communication circuit 130 may include any of the following: a receiver, a transmitter, a transceiver, input/ output (I/O) circuitry, input port(s) and/ or output port(s).
  • the re-establishment conditions are re-establishment conditions adjusted in dependence of information about results of previous re-establishment processes.
  • the results of previous re-establishment processes comprise information about whether or not the previous re-establishment resulted in re-establishment to the same cell to which the user equipment was connected before the previous re- establishment and/or information on operation conditions, e.g. radio connection characteristics, between the user equipment and a radio node having a cell to which the previous re-establishment was performed.
  • the re-establishment conditions are further dependent on a time since a latest previous re-establishment and/or a number of latest consecutive previous re-establishments that has not resulted in any change of cell for the user equipment.
  • the node is a network node of the mobile radio communication system.
  • the initializing of a re-establishment thereby comprises initializing a sending of a command for re-establishment to the user equipment from the radio node of the mobile radio communication system to which the user equipment is connected.
  • the command for re-establishment comprises a representation of a target frequency on which the re-establishment is recommended to be performed.
  • the determination is based on the present operation conditions as deduced in the mobile radio communication system to which the user equipment is connected. The determination is thereby based on a comparison of the deduced present operation conditions with the re- establishment conditions.
  • the present operation conditions comprise measures related to signal strength of an uplink channel from the user equipment, noise level in an uplink channel from said user equipment, transmitting power of downlink signalling to the user equipment, signalling propagation time to and/or from the user equipment, and/or directional information of signalling to and/or from the user equipment.
  • the node is further configured to obtain information about a result of the re-establishment process.
  • the node is thereby further configured to initialize an adjustment of the re-establishment conditions in dependence of the information about the result of the re-establishment process.
  • the results of the re-establishment process comprise information about whether or not the re-establishment resulted in re-establishment to the same cell to which the user equipment was connected before the re-establishment and/ or information on operation conditions between the user equipment and a radio node, in a cell different from the cell to which the user equipment was connected before the re-establishment, to which the re-establishment was performed.
  • the node is a user equipment.
  • the user equipment is further configured to receive signalling representing the re-establishment conditions from the radio node of the mobile radio communication system to which the user equipment is connected.
  • the user equipment is further configured to deduce the present operation conditions.
  • the user equipment is further configured to compare the deduced present operation conditions with the re-establishment conditions.
  • the present operation conditions comprise measures related to signal strength of a downlink channel, noise level in a downlink channel, transmission bitrate in a downlink and/ or uplink channel and/ or transmitting power of uplink signalling.
  • a user equipment configured to be connected to a mobile radio communication system.
  • the user equipment is configured to receive, from a radio node to which the user equipment is connected, a command for re-establishment.
  • the user equipment is further configured to determine a target cell of a target radio node to which a re-establishment is to be performed.
  • the user equipment is further configured to initialize a re-establishment to the target cell of the target radio node.
  • Fig. 17B is a schematic block diagram illustrating an example of a user equipment 20, based on a processor-memory implementation according to an embodiment.
  • the UE 20 comprises a processor 1 1 1 and a memory 121, the memory 121 comprising instructions executable by the processor 1 1 1, whereby the processor is operative to receive the command for establishment, to determine the target cell of the target radio node and to initialize the re-establishment.
  • the UE 20 also includes a communication circuit 131.
  • the communication circuit 131 may include functions for wired and/ or wireless communication with other devices and/or network nodes in the network. In a particular example, the communication circuit 131 may be based on radio circuitry for communication with one or more other nodes, including transmitting and/ or receiving information.
  • the communication circuit 131 may be interconnected to the processor 1 1 1 and/or memory 121.
  • the communication circuit 131 may include any of the following: a receiver, a transmitter, a transceiver, input/ output (I/O) circuitry, input port(s) and/ or output port(s).
  • the processor is operative to select a cell of a radio node presenting a highest signal strength as the target cell of the target radio node.
  • the command for re-establishment comprises a representation of a target frequency on which the re-establishment is recommended to be performed.
  • the processor is thereby operative to select a target cell of a target radio node using the target frequency.
  • a radio node for assisting in managing user equipment connections in a mobile radio communication system.
  • the radio node is configured to perform a re-establishment process of a user equipment.
  • the radio node is further configured to provide information about a result of the re-establishment process to a node managing re-establishment conditions.
  • the re- establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • Fig. 17C is a schematic block diagram illustrating an example of a radio node 30, based on a processor-memory implementation according to an embodiment.
  • the radio node 30 comprises a processor 1 12 and a memory 122, the memory 122 comprising instructions executable by the processor 1 12, whereby the processor is operative to finalize the re-establishment process and to provide the information about the result of the re-establishment process.
  • the radio node 30 does also include a communication circuit 132.
  • the communication circuit 132 may include functions for wired and/or wireless communication with other devices and/or network nodes in the network. In a particular example, the communication circuit 132 may be based on radio circuitry for communication with one or more other nodes, including transmitting and/or receiving information.
  • the communication circuit 132 may be interconnected to the processor 1 12 and/or memory 122.
  • the communication circuit 132 may include any of the following: a receiver, a transmitter, a transceiver, input/ output (I/O) circuitry, input port(s) and/ or output port(s).
  • a network node for assisting in managing user equipment connections in a mobile radio communication system.
  • the network node is configured to receive information about a result of a re-establishment process of a user equipment.
  • the network node is further configured to adjust re-establishment conditions in dependence of the information about the result of the re- establishment process.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • the network node is further configured to provide adjusted re-establishment conditions to a node in the mobile radio communication system.
  • Fig. 17D is a schematic block diagram illustrating an example of a network node 40, based on a processor-memory implementation according to an embodiment.
  • the radio node 40 comprises a processor 1 13 and a memory 123, the memory 123 comprising instructions executable by the processor 1 13, whereby the processor is operative to receive information about the result of the re-establishment process, to adjust the re- establishment conditions and to provide adjusted re-establishment conditions to the node in the mobile radio communication system.
  • the network node 40 does also include a communication circuit 133.
  • the communication circuit 133 may include functions for wired and/or wireless communication with other devices and/or network nodes in the network. In a particular example, the communication circuit 133 may be based on radio circuitry for communication with one or more other nodes, including transmitting and/or receiving information.
  • the communication circuit 133 may be interconnected to the processor 1 13 and/or memory 123.
  • the communication circuit 133 may include any of the following: a receiver, a transmitter, a transceiver, input/ output (I/O) circuitry, input port(s) and/ or output port(s).
  • the network node is further configured to perform one or both of two adjustment principles.
  • the first principle is to make the re- establishment conditions more restrictive as a response of the information about a result of a re-establishment process of a user equipment that is information about that the re-establishment resulted in re-establishment to the same cell to which the user equipment was connected before the re- establishment.
  • the second principle is to make the re-establishment conditions less restrictive as a response of the information about a result of a re-establishment process of a user equipment that is information about that the re-establishment resulted in re-establishment to another cell, providing better connection characteristics, different from the one to which the user equipment was connected before the re-establishment
  • the network node is further configured to adjust the re- establishment conditions in dependence of operation conditions between the user equipment and a radio node, to which the re-establishment was performed comprised in the information about the result of the re- establishment process of a user equipment.
  • Fig. 18A is a schematic block diagram illustrating another example of a node 10, based on a hardware circuitry implementation according to an embodiment.
  • Fig. 18B is a schematic block diagram illustrating another example of a UE 20, based on a hardware circuitry implementation according to an embodiment.
  • Fig. 18C is a schematic block diagram illustrating another example of a radio node 30, based on a hardware circuitry implementation according to an embodiment.
  • Fig. 18D is a schematic block diagram illustrating another example of a network node 40, based on a hardware circuitry implementation according to an embodiment.
  • suitable hardware (HW) circuitry include one or more suitably configured or possibly reconfigurable electronic circuitry, e.g.
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • any other hardware logic such as circuits based on discrete logic gates and/ or flip-flops interconnected to perform specialized functions in connection with suitable registers (REG), and/ or memory units (MEM).
  • REG registers
  • MEM memory units
  • Fig. 19A is a schematic block diagram illustrating yet another example of a node 10, based on combination of both processor(s) 310- 1, 310-2 and hardware circuitry 330- 1, 330-2 in connection with suitable memory unit(s) 320.
  • the node 10 comprises one or more processors 310- 1, 310-2, memory 320 including storage for software and data, and one or more units of hardware circuitry 330- 1, 330-2 such as ASICs and/or FPGAs.
  • the overall functionality is thus partitioned between programmed software (SW) for execution on one or more processors 310- 1, 310-2, and one or more pre- configured or possibly reconfigurable hardware circuits 330- 1, 330-2 such as ASICs and/or FPGAs.
  • SW programmed software
  • the actual hardware-software partitioning can be decided by a system designer based on a number of factors including processing speed, cost of implementation and other requirements.
  • Fig. 19B is a schematic block diagram illustrating yet another example of a UE 20, based on combination of both processor(s) 31 1- 1, 31 1-2 and hardware circuitry 331- 1, 331-2 in connection with suitable memory unit(s) 321.
  • the UE 20 comprises one or more processors 31 1- 1, 31 1-2, memory 321 including storage for software and data, and one or more units of hardware circuitry 331- 1, 331-2 such as ASICs and/ or FPGAs.
  • the overall functionality is thus partitioned between programmed software (SW) for execution on one or more processors 31 1- 1, 31 1-2, and one or more pre-configured or possibly reconfigurable hardware circuits 331- 1, 331-2 such as ASICs and/ or FPGAs.
  • SW programmed software
  • Fig. 19C is a schematic block diagram illustrating yet another example of a radio node 30, based on combination of both processor(s) 312- 1, 312-2 and hardware circuitry 332- 1, 332-2 in connection with suitable memory unit(s) 322.
  • the radio node 30 comprises one or more processors 312- 1, 312-2, memory 322 including storage for software and data, and one or more units of hardware circuitry 332- 1, 332-2 such as ASICs and/or FPGAs.
  • SW programmed software
  • processors 312- 1, 312-2 processors 312- 1, 312-2
  • pre- configured or possibly reconfigurable hardware circuits 332- 1, 332-2 such as ASICs and/or FPGAs.
  • the actual hardware-software partitioning can be decided by a system designer based on a number of factors including processing speed, cost of implementation and other requirements.
  • Fig. 19D is a schematic block diagram illustrating yet another example of a network node 40, based on combination of both processor(s) 313- 1, 313-2 and hardware circuitry 333- 1, 333-2 in connection with suitable memory unit(s) 323.
  • the network node 40 comprises one or more processors 313- 1, 313-2, memory 323 including storage for software and data, and one or more units of hardware circuitry 333- 1, 333-2 such as ASICs and/or FPGAs.
  • the overall functionality is thus partitioned between programmed software (SW) for execution on one or more processors 313- 1, 313-2, and one or more pre- configured or possibly reconfigurable hardware circuits 333- 1, 333-2 such as ASICs and/or FPGAs.
  • SW programmed software
  • the actual hardware-software partitioning can be decided by a system designer based on a number of factors including processing speed, cost of implementation and other requirements.
  • At least some of the steps, functions, procedures, modules and/ or blocks described herein may be implemented in software such as a computer program for execution by suitable processing circuitry such as one or more processors or processing units.
  • the flow diagram or diagrams presented herein may therefore be regarded as a computer flow diagram or diagrams, when performed by one or more processors.
  • a corresponding apparatus may be defined as a group of function modules, where each step performed by the processor corresponds to a function module.
  • the function modules are implemented as a computer program running on the processor.
  • processing circuitry includes, but is not limited to, one or more microprocessors, one or more Digital Signal Processors (DSPs), one or more Central Processing Units (CPUs), video acceleration hardware, and/ or any suitable programmable logic circuitry such as one or more Field Programmable Gate Arrays (FPGAs), or one or more Programmable Logic Controllers (PLCs).
  • DSPs Digital Signal Processors
  • CPUs Central Processing Units
  • FPGAs Field Programmable Gate Arrays
  • PLCs Programmable Logic Controllers
  • Fig. 20 is a schematic diagram illustrating an example of a computer- implementation according to an embodiment of a node 10, a UE 20, a radio node 30 or a network node 40.
  • a computer program 425; 435 which is loaded into the memory 420 for execution by processing circuitry including one or more processors 410.
  • the processor (s) 410 and memory 420 are interconnected to each other to enable normal software execution.
  • An optional input/output device 440 may also be interconnected to the processor(s) 410 and/ or the memory 420 to enable input and/or output of relevant data such as input parameter(s) and/or resulting output parameter(s).
  • the term 'processor' should be interpreted in a general sense as any system or device capable of executing program code or computer program instructions to perform a particular processing, determining or computing task.
  • the processing circuitry including one or more processors 410 is thus configured to perform, when executing the computer program 425, well-defined processing tasks such as those described herein.
  • the processing circuitry does not have to be dedicated to only execute the above-described steps, functions, procedure and/or blocks, but may also execute other tasks.
  • the computer program 425; 435 comprises instructions, which when executed by at least one processor 410, cause the processor(s) 410 to obtain a determination of that re-establishment conditions for a user equipment are fulfilled.
  • the determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • the instructions when executed by the processor(s), further cause the processor(s) to initialize a re-establishment for the user equipment as a response to the obtaining of said determination.
  • the computer program 425; 435 comprises instructions, which when executed by at least one processor 410, cause the processor(s) 410 to receive from a radio node, a command for re- establishment.
  • the instructions when executed by the processor(s), further cause the processor(s) to determine a target cell of a target radio node to which a re-establishment is to be performed.
  • the instructions when executed by the processor(s), further cause the processor(s) to initialize a re-establishment to the target cell of the target radio node.
  • the computer program 425; 435 comprises instructions, which when executed by at least one processor 410, cause the processor(s) 410 to perform a re-establishment process of a user equipment.
  • the instructions when executed by the processor(s), further cause the processor(s) to provide information about a result of the re- establishment process to a node managing re-establishment conditions.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • the computer program 425; 435 comprises instructions, which when executed by at least one processor 410, cause the processor(s) 410 to receive information about a result of a re- establishment process of a user equipment.
  • the instructions when executed by the processor(s), further cause the processor(s) to adjust re-establishment conditions in dependence of the information about the result of the re- establishment process.
  • the re-establishment conditions which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re- establishment process for the user equipment.
  • the instructions, when executed by the processor(s) further cause the processor(s) to provide adjusted re-establishment conditions to a node in the mobile radio communication system.
  • the proposed technology also provides a carrier comprising any of the computer programs described above, wherein the carrier is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  • the software or computer program 425; 435 may be realized as a computer program product, which is normally carried or stored on a computer-readable medium 420; 430, in particular a non-volatile medium.
  • the computer-readable medium may include one or more removable or nonremovable memory devices including, but not limited to a Read-Only Memory (ROM), a Random Access Memory (RAM), a Compact Disc (CD), a Digital Versatile Disc (DVD), a Blu-ray disc, a Universal Serial Bus (USB) memory, a Hard Disk Drive (HDD) storage device, a flash memory, a magnetic tape, or any other conventional memory device.
  • the computer program may thus be loaded into the operating memory of a computer or equivalent processing device for execution by the processing circuitry thereof.
  • Fig. 21 is a schematic block diagram illustrating an example of a network device 50 comprising a node 10, a radio node 30 or a network node 40 according to any of the embodiments above.
  • the network device may be any suitable network device in the wireless communication system, or a network device in connection with the wireless communication system.
  • the network device may be a suitable network node such a base station or an access point.
  • the network device may alternatively be a cloud-implemented network device.
  • the flow diagram or diagrams presented herein may be regarded as a computer flow diagram or diagrams, when performed by one or more processors.
  • a corresponding apparatus may be defined as a group of function modules, where each step performed by the processor corresponds to a function module.
  • the function modules are implemented as a computer program running on the processor.
  • the computer program residing in memory may thus be organized as appropriate function modules configured to perform, when executed by the processor, at least part of the steps and/or tasks described herein.
  • Fig. 22 A is a schematic diagram illustrating an example of a node 10 for managing user equipment connections in a mobile radio communication system.
  • the node 10 comprises a re-establishment surveillance module 510 for obtaining a determination of that re-establishment conditions for a user equipment are fulfilled. The determination is performed as a comparison between the re-establishment conditions and present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected.
  • the node 10 further comprises a re-establishment initializing module 520 for initializing a re-establishment for the user equipment as a response to the obtaining of the determination.
  • Fig. 22B is a schematic diagram illustrating an example of a user equipment 20, wherein the UE 20 comprises a receiver 530 for receiving, from a radio node to which the user equipment is connected, a command for re- establishment.
  • the UE 20 further comprises a target determining module 540 for determining a target cell of a target radio node to which a re-establishment is to be performed.
  • the UE 20 also comprises a re-establishment module 550 for initializing a re-establishment to the target cell of the target radio node.
  • Fig. 22C is a schematic diagram illustrating an example of a radio node 30 for assisting in managing user equipment connections in a mobile radio communication system.
  • the radio node 30 comprises a re-establishment module 555 for performing a re-establishment process of a user equipment.
  • the radio node 30 further comprises a communication module 560 for providing information about a result of the re-establishment process to a node managing re-establishment conditions.
  • the re-establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • Fig. 22 D is a schematic diagram illustrating a network node 40 for assisting in managing user equipment connections in a mobile radio communication system.
  • the network node 40 comprises a receiver 570 for receiving information about a result of a re-establishment process of a user equipment.
  • the network node 40 further comprises a re-establishment condition handler module 580 for adjusting re-establishment conditions in dependence of the information about the result of the re-establishment process.
  • the re- establishment conditions are conditions, which when fulfilled by present operation conditions for communication between the user equipment and a radio node of the mobile radio communication system to which the user equipment is connected, are used for triggering a re-establishment process for the user equipment.
  • the network node 40 also comprises a re- establishment condition provider module 590 for providing adjusted re- establishment conditions to a node in the mobile radio communication system.
  • module(s) in Figs. 22A-D predominantly by hardware modules, or alternatively by hardware, with suitable interconnections between relevant modules.
  • Particular examples include one or more suitably configured digital signal processors and other known electronic circuits, e.g. discrete logic gates interconnected to perform a specialized function, and / or Application Specific Integrated Circuits (ASICs) as previously mentioned.
  • Other examples of usable hardware include input/output (I/O) circuitry and/or circuitry for receiving and/or sending signals.
  • I/O input/output
  • computing services can be distributed or re-located to one or more separate physical nodes or servers.
  • the functionality may be re-located or distributed to one or more jointly acting physical and/or virtual machines that can be positioned in separate physical node(s), i.e. in the so-called cloud.
  • cloud computing is a model for enabling ubiquitous on-demand network access to a pool of configurable computing resources such as networks, servers, storage, applications and general or customized services.
  • Fig. 23 is a schematic diagram illustrating an example of how functionality can be distributed or partitioned between different network devices in a general case.
  • the network devices 610-630 may be part of the same wireless communication system, or one or more of the network devices may be so-called cloud-based network devices located outside of the wireless communication system.
  • Fig. 24 is a schematic diagram illustrating an example of a wireless communication system, including an access network 710 and/ or a core network 720 and/or an Operations and Support System (OSS), 730 in cooperation with one or more cloud-based network devices 740.
  • Functionality relevant for the access network 710 and/or the core network 720 and/or the OSS system 730 may be at least partially implemented for execution in a cloud- based network device 740, with suitable transfer of information between the cloud-based network device and the relevant network nodes and/or communication units in the access network and/or the core network and/or the OSS system.
  • a Network Device may generally be seen as an electronic device being communicatively connected to other electronic devices in the network.
  • the network device may be implemented in hardware, software or a combination thereof.
  • the network device may be a special-purpose network device or a general purpose network device, or a hybrid thereof.
  • a special-purpose network device may use custom processing circuits and a proprietary operating system (OS), for execution of software to provide one or more of the features or functions disclosed herein.
  • OS operating system
  • a general purpose network device may use Commercial Off-The-Shelf (COTS) processors and a standard OS, for execution of software configured to provide one or more of the features or functions disclosed herein.
  • COTS Commercial Off-The-Shelf
  • a special-purpose network device may include hardware comprising processing or computing resource(s), which typically include a set of one or more processors, and physical network interfaces (NIs), which sometimes are called physical ports, as well as non-transitory machine readable storage media having stored thereon software.
  • a physical NI may be seen as hardware in a network device through which a network connection is made, e.g. wirelessly through a Wireless Network Interface Controller (WNIC) or through plugging in a cable to a physical port connected to a Network Interface Controller (NIC).
  • WNIC Wireless Network Interface Controller
  • NIC Network Interface Controller
  • the software may be executed by the hardware to instantiate a set of one or more software instance(s) .
  • Each of the software instance(s), and that part of the hardware that executes that software instance may form a separate virtual network element.
  • a general purpose network device may for example include hardware comprising a set of one or more processor(s), often COTS processors, and network interface controller(s) (NICs), as well as non-transitory machine readable storage media having stored thereon software.
  • the processor(s) executes the software to instantiate one or more sets of one or more applications.
  • one embodiment does not implement virtualization, alternative embodiments may use different forms of virtualization - for example represented by a virtualization layer and software containers.
  • one such alternative embodiment implements operating system-level virtualization, in which case the virtualization layer represents the kernel of an operating system (or a shim executing on a base operating system) that allows for the creation of multiple software containers that may each be used to execute one of a sets of applications.
  • each of the software containers also called virtualization engines, virtual private servers, or jails
  • a user space instance typically a virtual memory space.
  • the virtualization layer represents a hypervisor (sometimes referred to as a Virtual Machine Monitor (VMM)) or the hypervisor is executed on top of a host operating system; and 2) the software containers each represent a tightly isolated form of software container called a virtual machine that is executed by the hypervisor and may include a guest operating system.
  • VMM Virtual Machine Monitor
  • a hypervisor is the software/ hardware that is responsible for creating and managing the various virtualized instances and in some cases the actual physical hardware.
  • the hypervisor manages the underlying resources and presents them as virtualized instances. What the hypervisor virtualizes to appear as a single processor may actually comprise multiple separate processors. From the perspective of the operating system, the virtualized instances appear to be actual hardware components.
  • a virtual machine is a software implementation of a physical machine that runs programs as if they were executing on a physical, non-virtualized machine; and applications generally do not know they are running on a virtual machine as opposed to running on a "bare metal" host electronic device, though some systems provide para-virtualization which allows an operating system or application to be aware of the presence of virtualization for optimization purposes.
  • the instantiation of the one or more sets of one or more applications as well as the virtualization layer and software containers if implemented, are collectively referred to as software instance(s).
  • Each set of applications, corresponding software container if implemented, and that part of the hardware that executes them (be it hardware dedicated to that execution and / or time slices of hardware temporally shared by software containers), forms a separate virtual network element(s).
  • NFV Network Function Virtualization
  • CPE Customer Premise Equipment
  • different embodiments may implement one or more of the software container(s) differently. For example, while embodiments are illustrated with each software container corresponding to a VNE, alternative embodiments may implement this correspondence or mapping between software container-VNE at a finer granularity level; it should be understood that the techniques described herein with reference to a correspondence of software containers to VNEs also apply to embodiments where such a finer level of granularity is used.
  • a hybrid network device which includes both custom processing circuitry/ proprietary OS and COTS processors/ standard OS in a network device, e.g. in a card or circuit board within a network device ND.
  • a platform Virtual Machine such as a VM that implements functionality of a special-purpose network device, could provide for para- virtualization to the hardware present in the hybrid network device.
  • Fig. 25 illustrates one embodiment of a mobile radio communication system, where the different functionality for providing the re-establishment is distributed. The re-establishment management function may be split into several nodes.
  • RCF radio control function
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network

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

Abstract

L'invention concerne un procédé de gestion de connexions d'équipement utilisateur dans un système de communication radio mobile qui consiste à : obtenir (S1) une détermination du fait que les conditions de rétablissement pour un équipement utilisateur sont satisfaites, et initialiser (S2) un rétablissement pour l'équipement utilisateur en réponse à l'obtention de la détermination. La détermination est effectuée en tant que comparaison entre les conditions de rétablissement et les conditions de fonctionnement actuelles pour une communication entre l'équipement utilisateur et un nœud radio du système de communication radio mobile auquel l'équipement utilisateur est connecté. L'invention concerne également un procédé de gestion, dans un équipement utilisateur, de connexions d'équipement utilisateur. L'invention concerne également un procédé d'aide à la gestion de connexions d'équipement utilisateur dans un système de communication radio mobile. En outre, l'invention concerne également des nœuds dans lesquels de tels procédés sont mis en oeuvre, ainsi que des programmes informatiques associés.
PCT/SE2017/050256 2017-03-16 2017-03-16 Mobilité non préparée dans un système de communication mobile WO2018169461A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100173626A1 (en) * 2009-01-06 2010-07-08 Qualcomm Incorporated Adaptation of handover parameters
US20160285679A1 (en) * 2014-03-21 2016-09-29 Telefonaktiebolaget Lm Ericsson (Publ) Mobility Robustness in a Cellular Network

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100173626A1 (en) * 2009-01-06 2010-07-08 Qualcomm Incorporated Adaptation of handover parameters
US20160285679A1 (en) * 2014-03-21 2016-09-29 Telefonaktiebolaget Lm Ericsson (Publ) Mobility Robustness in a Cellular Network

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
INTEL CORPORATION ET AL: "Corrections to NB-IoT description in TS 36.300", vol. RAN WG2, no. Gothenburg, Sweden; 20160822 - 20160826, 26 September 2016 (2016-09-26), XP051161230, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/Specifications/201609_draft_specs_after_RAN_73/History/> [retrieved on 20160926] *
NTT DOCOMO ET AL: "NAS Recovery for NB-IoT UE", vol. RAN WG2, no. Dubrovnik, Croatia; 20160411 - 20160415, 2 April 2016 (2016-04-02), XP051082490, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_93bis/Docs/> [retrieved on 20160402] *

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