Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W92/00—Interfaces specially adapted for wireless communication networks
  • H04W92/02—Inter-networking arrangements
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/20—Selecting an access point
• • 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
  • H04W36/00837—Determination of triggering parameters for hand-off
  • H04W36/008375—Determination of triggering parameters for hand-off based on historical data
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
  • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

• the present disclosure relates to a wireless communication system, and more particularly, to a method and an apparatus for interworking between a terminal and a network when network interworking with a wireless LAN is supported.
• LTE Long-Term Evolution
• 3GPP 3rd Generation Partnership Project
• the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post LTE System’.
• the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
• mmWave e.g., 60GHz bands
• MIMO massive multiple-input multiple-output
• FD-MIMO Full Dimensional MIMO
• array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
• RANs Cloud Radio Access Networks
• D2D device-to-device
• CoMP Coordinated Multi-Points
• FQAM Hybrid FSK and QAM Modulation
• SWSC sliding window superposition coding
• ACM advanced coding modulation
• FBMC filter bank multi carrier
• NOMA non-orthogonal multiple access
• SCMA sparse code multiple access
• the Internet which is a human centered connectivity network where humans generate and consume information
• IoT Internet of Things
• IoE Internet of Everything
• sensing technology “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology”
• M2M Machine-to-Machine
• MTC Machine Type Communication
• IoT Internet technology services
• IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
• IT Information Technology
• 5G communication systems to IoT networks.
• technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas.
• MTC Machine Type Communication
• M2M Machine-to-Machine
• Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
• RAN Radio Access Network
• a communication method of a terminal in a wireless communication system includes receiving, by the terminal, a first message containing a network interworking related parameter during a first state, if a state of the terminal is changed to a second state and returns to the first state again, identifying whether the first message received during the previous first state is effective, and if the first message received in the previous first state is effective, determining to use the network interworking related parameter for network interworking.
• terminal in accordance with another aspect of the present disclosure, includes a transceiver configured to transceive a signal, and a controller configured to control the terminal to receive a first message containing including a network interworking related parameter during a first state, to identify whether the first message received in the previous first state is effective if a state of the terminal changes to a second state and returns to the first state again, and to determine to use the network interworking related parameter for network interworking if the first message received during the previous first state is effective.
• a transceiver configured to transceive a signal
• a controller configured to control the terminal to receive a first message containing including a network interworking related parameter during a first state, to identify whether the first message received in the previous first state is effective if a state of the terminal changes to a second state and returns to the first state again, and to determine to use the network interworking related parameter for network interworking if the first message received during the previous first state is effective.
• the present technology it is possible to prevent a UE from unnecessarily moving (ping-pong effect) between a wireless LAN and an LTE network, and to prevent the UE from unnecessarily receiving network interworking related information from a base station, thereby reducing power consumption.
• FIG. 1 is a diagram schematically illustrating a structure of an LTE system, which is an example of a mobile communication network suggested in the present disclosure
• FIG. 2 is a diagram illustrating a wireless protocol structure of an LTE system, which is an example of a mobile communication network suggested in the present disclosure
• FIG. 3 is a diagram illustrating a message flow for interworking between a mobile communication network and a wireless LAN
• FIG. 4 is a diagram illustrating a message flow for interworking between a mobile communication network and a wireless LAN according to an exemplary embodiment of the present disclosure
• FIG. 5 is a diagram illustrating an operation of user equipment for interworking between a mobile communication network and a wireless LAN according to the exemplary embodiment of the present disclosure
• FIG. 6 is a diagram illustrating a schematic structure of user equipment according to the exemplary embodiment of the present disclosure.
• FIG. 7 is a diagram illustrating a schematic structure of a base station according to the exemplary embodiment of the present disclosure.
• FIGURES 1 through 7, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged telecommunication technologies.
• the present disclosure will be described with reference to the accompanying drawings.
• the present disclosure may have various embodiments, and modifications and changes may be made therein. Therefore, the present disclosure will be described in conjunction with particular embodiments shown in the accompanying drawings. However, it should be understood that the present disclosure is not limited to the particular embodiments, but includes all modifications, equivalents, and/or alternatives within the spirit and scope of the present disclosure.
• similar reference numerals are used to designate similar elements.
• the expression “or” includes any or all combinations of words enumerated together.
• the expression “A or B” may include A, may include B, or may include both A and B.
• expressions including ordinal numbers, such as “first” and “second,” etc. may modify various elements.
• elements are not limited by the above expressions.
• the above expressions do not limit the sequence and/or importance of the elements.
• the above expressions are used merely for the purpose of distinguishing an element from the other elements.
• a first user device and a second user device indicate different user devices although both of them are user devices.
• a first element could be termed a second element, and similarly, a second element could be also termed a first element without departing from the scope of the present disclosure.
• a mobile communication network of the present specification can include, for example, a 3GPP network, such as an LTE system.
• a 3GPP network such as an LTE system.
• Exemplary embodiments of the present disclosure will be described in detail mainly based on the LTE system, but the main point of the present disclosure is also applicable to other mobile communication systems that have similar technical backgrounds and channel form with a slight modification without considerably departing from the scope of the present disclosure, and can be determined by those skilled in the art.
• FIG. 1 is a diagram schematically illustrating a structure of an LTE system.
• a wireless access network of the LTE system includes base stations (ENB) 105, 110, 115, and 120, a Mobility Management Entity (MME) 125, and a Serving-Gateway (S-GW) 130.
• ENB base stations
• MME Mobility Management Entity
• S-GW Serving-Gateway
• One ENB 105, 110, 115, or 120 generally controls a plurality of cells.
• the LTE system uses an Orthogonal Frequency Division Multiplexing (OFDM) scheme as a wireless access technology in a bandwidth of 20 MHz.
• OFDM Orthogonal Frequency Division Multiplexing
• the ENBs 105, 110, 115, and 120 use an Adaptive Modulation & Coding (AMC) scheme, which determines a modulation scheme and a channel coding rate in accordance with a channel state of the UE 135.
• AMC Adaptive Modulation & Coding
• the S-GW 130 is a device for providing a data bearer, and generates or removes the data bearer under the control of the MME 125.
• the MME 125 is a device serving various control functions, as well as a mobility management function for the UE 135, and is connected with a plurality of base stations.
• FIG. 2 is a diagram illustrating a structure of a wireless protocol in the LTE system.
• the UE and the ENB includes a Packet Data Convergence Protocol (PDCP) 205 and 240, a Radio Link Control (RLC) 210 and 235, a Medium Access Control (MAC) 215 and 230, respectively, as the wireless protocol of the LTE system.
• PDCP Packet Data Convergence Protocol
• RLC Radio Link Control
• MAC Medium Access Control
• the PHY layers 220 and 225 perform an operation of channel-coding and modulating higher layer data, generating an OFDM symbol and transmitting the OFDM symbol through a radio channel, or demodulating and channel-decoding the OFDM symbol received through the radio channel and transmitting the demodulated and channel-decoded OFDM symbol to the higher layer.
• FIG. 3 is a diagram illustrating an example of a message flow for interworking between a mobile communication network (for example, an LTE network) and a wireless LAN.
• a mobile communication network for example, an LTE network
• a wireless LAN for example, a Wi-Fi network
• a UE 305 that is connected to a mobile communication network can selectively receive a network interworking related parameter from an Access Network Discovery & Selection Function (ANDSF) server 315.
• the network interworking related parameter can include a network selection and traffic control related policy.
• the network interworking related parameter can include, for example, wireless LAN access point identifier information about a specific business operator, a corresponding wireless LAN access point connection related condition, and the like.
• the UE 305 can additionally receive the network interworking related parameter from the base station 310 later.
• the UE 305 can receive the network interworking related parameter through a message, which a base station 310 transmits to all of the UEs within the cell through a broadcast, and can also receive the network interworking related parameter through a message (for example, a Radio Resource Control (RRC) connection resetting message), which a base station 310 transmits to a specific UE through a unicast.
• RRC Radio Resource Control
• the message transmitted through the broadcast can include a SystemInformationBlockType17 (SIB17) message.
• SIB17 SystemInformationBlockType17
• FIG. 3 illustrates a case where the network interworking related parameter is received through the broadcasted SIB17 message, but the present disclosure is not limited thereto, and the network interworking related parameter can also be received through a setting message transmitted through the unicast as a matter of course.
• the network interworking policy is updated by replacing replaceable items in the previously received policy with information on the SIB17 message (or the setting message). For example, when the ANDSF server 315 directs the UE to move to the wireless LAN when the signal intensity of the base station is X or lower, but the base station 310 transmits Y as a corresponding value, the UE 305 can update the policy so that the UE 305 moves to the wireless LAN when the signal intensity of the base station is Y or lower.
• the UE 305 can also generate a policy only with the network interworking related parameter transmitted by the base station 310. For example, when the base station 310 transmits Y as a value of a parameter related to the signal intensity of the base station, the UE 305 can generate a policy so that the UE 305 moves to the wireless LAN when the signal intensity of the base station is Y or lower.
• the UE 305 can perform interworking between the mobile communication network and the wireless LAN with the updated or generated network interworking policy.
• the UE 305 can select the mobile communication network or the wireless LAN based on the network interworking policy.
• the UE 305 performs interworking with the wireless LAN based on the aforementioned procedure, a case where the UE moves to a shadow area and the like needs to be additionally considered. For example, when the UE moves the shadow area, the UE needs to clearly determine an operation for whether to perform the network interworking and whether to utilize information on the network interworking related parameter.
• FIG. 4 is a diagram illustrating a message flow for interworking between a mobile communication network and a wireless LAN according to an exemplary embodiment of the present disclosure.
• a UE 405 that is connected to a mobile communication network can selectively receive a network interworking related parameter from an Access Network Discovery & Selection Function (ANDSF) server 415.
• the network interworking related parameter can include a network selection and traffic control related policy.
• the network interworking related parameter can include, for example, wireless LAN access point identifier information about a specific business operator, a corresponding wireless LAN access point connection related condition, and the like.
• the UE 405 receives a release command from a base station 410 and is operated in an idle mode, and the UE 405 selects a surrounding suitable cell by performing a cell selection or cell re-selection procedure and stays in the selected cell during the idle mode.
• the stay operation is also expressed as “camping”.
• the “suitable cell” can include a cell that satisfies at least one of the conditions below.
• the UE can provide a normal service.
• the cell is operated by a selected business operator/registered business operator/equivalent business operator.
• the CSG cell exists in broadcasted CSG ID and CSG white list.
• a cell is not blocked, and satisfies a cell selection condition.
• the UE 405 when the UE 405 camps in the cell satisfying the condition, the UE 405 can additionally receive the network interworking related parameter from the base station 410 in operation 430.
• the UE 405 can receive the network interworking related parameter through a message, which the base station 410 transmits to all of the UEs within the cell through a broadcast, and can also receive the network interworking related parameter through a message (for example, an RRC connection resetting message), which the base station 410 transmits to specific UE through a unicast.
• a message for example, an RRC connection resetting message
• the message transmitted through the broadcast can include SystemInformationBlockType17 (SIB17) message.
• SIB17 SystemInformationBlockType17
• FIG. 4 illustrates a case where the network interworking related parameter is received through the broadcasted SIB17 message, but the present disclosure is not limited thereto, and the network interworking related parameter can also be received through a setting message that is transmitted through the unicast as a matter of course.
• the network interworking policy can be updated by replacing replaceable items in the previously received policy with information on the SIB17 message (or the setting message). For example, when the ANDSF server 415 directs the UE 405 to move the wireless LAN when the signal intensity of the base station is X or lower, but the base station 410 transmits Y as a corresponding value, the UE 405 can update the policy so that the UE 405 moves to the wireless LAN when the signal intensity of the base station is Y or lower.
• the UE 405 can also generate a policy only with the network interworking related parameter transmitted by the base station 410. For example, when the base station 410 transmits a value Y of parameter related to the signal intensity of the base station, the UE 405 can generate a policy so that the UE 405 moves to the wireless LAN when the signal intensity of the base station is Y or lower.
• the UE 405 can perform interworking between the mobile communication network and the wireless LAN with the updated or generated network interworking policy.
• the UE 405 can select the mobile communication network or the wireless LAN based on the network interworking policy.
• the UE 405 can stop the operation of performing interworking between the mobile communication network and the wireless LAN of operation 435 in this case.
• the UE 405 can continuously store the network interworking related parameter previously received from the base station 410.
• the UE 405 can search for a “suitable cell” in the surrounding area again and can camp in the corresponding cell. That is, the UE 405 can be in a state of camping in the “suitable cell”.
• the UE 405 can determine whether it is possible to use the previously received and stored network interworking related parameter as it is, or it is necessary to receive a new network interworking related parameter.
• FIG. 4 illustrates a case where the UE 405 determines whether it is necessary to receive the SIB17 message, but the present disclosure is not limited thereto. For example, when the “suitable cell” that is found again by the UE 405 is the same as the “suitable cell” in which the UE 405 last stays, the UE 405 can determine that it is not necessary to re-receive the network interworking related parameter.
• the UE 405 can determine that it is necessary to re-receive the network interworking related parameter.
• the UE 405 can determine whether the previously received network interworking related parameter is changed, for example, by checking the value of ValueTag transmitted through the SIB17 message and determining whether the value is changed.
• the UE 405 can receive a new network interworking related parameter from the base station 410 through the SIB17 message.
• the UE in a case where it is desired to interwork between the mobile communication network and the wireless LAN in the wireless mobile communication system, the UE can receive the network interworking related information as necessary and can perform network interworking only when the UE camps in the “suitable cell”. Further, when the UE does not camp in the “suitable cell”, the UE does not perform network interworking based on the network interworking related information and search for a “suitable cell”.
• FIG. 5 is a diagram illustrating an operation of UE (for example, the UE 405) for interworking between a mobile communication network and a wireless LAN according to the exemplary embodiment of the present disclosure.
• a UE can turn on power, and in operation 510, the UE can camp in a cell that is selected by performing a cell selection.
• the UE can perform a cell selection procedure in order to search for a “suitable cell” in a surrounding area, and can continuously perform a cell reselection procedure in order to search for a better cell.
• the UE can confirm whether the cell, in which the UE camps, is the “suitable cell”. For example, a state where the UE camps in the “suitable cell” can be defined as a first state, and a state where the UE deviates from the state where the UE camps in the “suitable cell”, for example, a state where the UE camps in an unsuitable cell, can be defined as a second state.
• the UE can determine whether it is necessary to update the SIB17 message in operation 520. For example, when a state of the UE is changed from the first state to the second state, and then returns to the first state, the UE can determine whether it is necessary to update the SIB17 message.
• FIG. 5 illustrates a case where the SIB17 message is updated, but various exemplary embodiments of the present disclosure can include various examples of determining whether it is necessary to update the network interworking parameter.
• the UE can determine that it is not necessary to update the SIB17 message. Otherwise, the UE can determine that it is necessary to update the SIB17 message. Whether the previously received SIB17 message is changed can be determined, for example, by checking a value of ValueTag transmitted through the SIB17 message and determining whether the value is changed.
• the UE can receive the SIB17 message currently transmitted through the “suitable cell” in operation 530.
• the UE when the UE has a network interworking policy that has been previously received from an ANDSF server and the like by accessing a base station and stored, and additionally receives the SIB17 message, the UE can update the network interworking policy by replacing replaceable items in the previously received policy with information on the SIB17 message. For example, when the ANDSF server directs the UE to move the wireless LAN when the signal intensity of the base station is X or lower, but the base station transmits Y as a corresponding value, the UE can update the policy so that the UE moves to the wireless LAN when the signal intensity of the base station is Y or lower.
• the UE can also generate a policy only with the SIB17 message transmitted by the base station. For example, when the base station transmits Y as a value of a parameter related to the signal intensity of the base station, the UE can generate a policy so that the UE moves to the wireless LAN when the signal intensity of the base station is Y or lower.
• the UE can store the updated or generated network interworking policy.
• the UE can perform interworking between the mobile communication network and the wireless LAN by applying the stored network interworking policy.
• the UE can perform interworking between the mobile communication network and the wireless LAN by applying the previously received and stored network interworking policy.
• the UE can stop the operation of performing interworking between the mobile communication network and the wireless LAN with the aforementioned network interworking policy in operation 525.
• the UE can continuously store the network interworking related parameter previously received from the base station. Then, when the UE finds the “suitable cell” again, the UE can also continuously use the previously stored network interworking related parameter without re-reception according to necessity of the update.
• the UE when the UE does not camp in the “suitable cell”, it is possible to prevent the UE from unnecessarily moving between the wireless LAN and the mobile communication network (a Ping-Pong effect). Further, when the UE has previously received the network interworking related information from the base station, the UE does not unnecessarily receive the network interworking related information from the base station when returning to the corresponding cell again, thereby decreasing power consumption.
• FIG. 6 is a diagram illustrating a schematic structure of a user equipment according to the exemplary embodiment of the present disclosure.
• a UE 600 can include a controller 605 and a transceiver 610.
• the controller 605 can control an operation of the UE according to the aforementioned exemplary embodiment of the present disclosure to be implemented.
• the transceiver 610 can transceive a signal with a base station or a network interworking server under the control of the controller 605.
• the controller 605 can control the UE to receive a first message that includes the network interworking related parameter in a first state. Then, when the state of the UE is changed to the second state and then returns to the first state, the controller 605 can determine whether the first message received in the previous first state is effective, and when the first message received in the previous first state is effective, the UE can determine to use the network interworking related parameter for network interworking.
• the first state can indicate that the UE camps in a cell, which satisfies a predetermined condition.
• the second state can indicate that the UE camps in a cell, which does not satisfy the predetermined condition.
• the state where the state of the UE returns to the first state can indicate that the UE camps in the same cell as the cell, in which the UE camps in the previous first state, again.
• the cell satisfying the predetermined condition is operated by a business operator to which the UE subscribes.
• the first message can include a setting message transmitted by a base station or a system information message of system information block type 17 broadcasted by the base station.
• the controller 605 can control the EU to receive a second message containing information indicating whether to change a parameter included in the previously received system information message. Further, the controller 605 can confirm whether the previously received system information message is effective based on the information included in the second message.
• the second message can include a system information message of system information block type 1 broadcasted by the base station.
• the network interworking related parameter can include information for interworking with the wireless LAN.
• the information for interworking with the wireless LAN can include at least one of identification information about the wireless LAN and the wireless LAN access condition information.
• FIG. 7 is a diagram illustrating a schematic structure of a base station according to the exemplary embodiment of the present disclosure.
• a base station 700 can include a controller 705 and a transceiver 710.
• the controller 705 can control an operation of the base station according to the exemplary embodiment of the present disclosure to be implemented.
• the transceiver 710 can transceive a signal with a UE under the control of the controller 705.
• the controller 705 can control a first message containing a network interworking related parameter to be transmitted to the UE.
• the first message can include a setting message transmitted by unicast or a system information message of system information block type 17 broadcasted by the base station.
• the cell, which satisfies the predetermined condition is operated by a business operator to which the UE subscribes.

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

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• 2015
  • 2015-10-12 KR KR1020150142354A patent/KR20160048651A/ko unknown
  • 2015-10-22 CN CN201580057810.3A patent/CN107113710A/zh not_active Withdrawn
  • 2015-10-22 EP EP15851743.3A patent/EP3210419A1/de not_active Withdrawn

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