(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2014/0106793 A1
`(43) Pub. Date:
`Apr. 17, 2014
`Lee et al.
`
`US 201401 06793A1
`
`(54) METHOD AND APPARATUS FOR
`EFFICIENTLY PERFORMING PAGING INA
`WIRELESS ACCESS SYSTEM THAT
`SUPPORTSA MULTI-RADIO ACCESS
`TECHNOLOGY
`
`(75) Inventors: Eunjong Lee, Anyang-si (KR);
`Youngsoo Yuk, Anyang-si (KR);
`Heejeong Cho, Anyang-si (KR)
`
`(73) Assignee: LG ELECTRONICS INC., Seoul (KR)
`(21) Appl. No.:
`14/117,325
`(22) PCT Filed:
`May 25, 2012
`(86). PCT No.:
`PCT/KR2O12/OO41.65
`S371 (c)(1),
`(2), (4) Date:
`
`Nov. 12, 2013
`
`Related U.S. Application Data
`(60) Provisional application No. 61/489,697, filed on May
`25, 2011, provisional application No. 61/508,052,
`filed on Jul 14, 2011.
`
`Publication Classification
`
`(51) Int. Cl.
`H04768/00
`(52) U.S. Cl.
`CPC ..................................... H04 W 68/00 (2013.01)
`USPC .......................................................... 45S/458
`
`(2006.01)
`
`ABSTRACT
`(57)
`According to a first embodiment disclosed in the present
`description, a method for receiving apaging message of a first
`base station by a terminal which can transceive data to/from
`the first base station that Supports a first radio access technol
`ogy (RAT) and a second base station that Supports a second
`radio access technology, in a wireless access system that
`Supports a multi-radio access technology, comprises the steps
`of establishing a connection to the first base station; receiv
`ing, from the first base station, a second base station connec
`tion command message including a paging message transmis
`sion indication; establishing a connection to the second base
`station in response to the second base station connection
`command message; and monitoring a paging message of the
`first base station on the basis of the paging message transmis
`sion indication using either the first base station or the second
`base station.
`
`OO
`
`110
`
`PACKET ACCESS
`ROUTER
`
`
`
`SERVER
`
`HOME AGENT
`
`GGSN ACCESS
`ROUTER
`
`ACCESS GATEWAY
`(SGSN)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 1 of 14
`
`US 2014/0106793 A1
`
`FIG. 1A
`
`OO
`
`110
`
`PACKET ACCESS
`ROUTER
`
`
`
`-
`
`SERVER
`
`HOME AGENT
`
`
`
`GGSN ACCESS
`ROUTER
`
`ACCESS GATEWAY
`(SGSN)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 2 of 14
`
`US 2014/0106793 A1
`
`WLAN ACCESS is
`GATEWAY
`it
`
`PACKET ACCESS
`ROUTER
`
`
`
`6.17
`I
`
`
`
`SERVER
`
`6%417
`I
`t
`HOMEAGENT
`
`FIG. 1B
`
`WIRELESS CONTROL
`CONNECTION
`
`GGSN ACCESS
`ROUTER
`OU
`
`ACCESS GATEWAY
`(SGSN)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 3 of 14
`
`US 2014/0106793 A1
`
`FIG. 2
`
`MULTIRATMS
`
`INITIALNETWORKENTRY PROCEDURE EXECUTION
`(MULTIRATMSCAPABILITY FIELD = |
`
`S220 - WULTRATCADABILITYNEGOTLATION
`
`N
`
`DATA COMMUNICATION
`
`X
`
`Par: as
`
`23) -
`
`SECONDARY SYSTEMSCANNINGPROCEDURE
`
`S4C) -
`
`SECONDARYSYSTEM MANAGEVENT PROCEDURF.
`
`FIG. 3
`
`MULTIRATMS
`
`S210 - - INITIAL NETWORKENTRY PROCEDURE EXECUTION
`(MULTI RATMSCAPABILITY FIELD='1')
`
`
`
`MULTIRATCAPABILITYNEGOTIATION
`
`MULTIRATCAPABILITYNEGOTIATION (S221)
`
`s
`
`S220 ---
`
`MULTISYSTEMREQUEST MESSAGE (S222)
`
`-
`
`MULTISYSTEMRESPONSE MESSAGE (S223)
`
`s
`
`DATACOMMUNICATION
`
`S230 - -
`
`SECONDARY SYSTEMSCANNING PROCEDURE
`
`S240 -
`
`SECONDARY SYSTEMMANAGEMENT PROCEDURE
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 4 of 14
`
`US 2014/0106793 A1
`
`FIG. 4
`
`A
`
`as
`
`as
`
`S210 N- INITIALNETWORKENTRY PROCEDURE EXECUTION
`
`S220 ---
`
`MULTI RAT CAPABILITYNEGOTIATION
`
`K
`
`DATA COMMUNICATION
`
`X
`
`SECONDARY SYSTEMSCANNING PROCEDURE
`
`MULTIRATSCAN COMMAND MESSAGE (S231)
`
`e
`
`SECONDARY SYSTEMSCANNING(S232)
`
`MULTIRATSCAN REPORTMESSAGE (S233)
`
`ass
`
`S230
`
`S240 -
`
`SECONDARY SYSTEM MANAGEMENT PROCEDURE
`
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`Patent Application Publication
`
`Apr. 17, 2014 Sheet 5 of 14
`
`US 2014/0106793 A1
`
`FIG. 5
`
`S210 N- INITIALNETWORKENTRY PROCEDURE EXECUTION
`
`S220 ---
`
`MULTI RAT CAPABILITYNEGOTIATION
`
`K
`
`DATA COMMUNICATION
`
`X
`
`S23) -
`
`SECONDARY SYSTEM SCANNING PROCEDURE
`
`SECONDARY SYSTEM
`COMMAND MESSAGE(AP2)
`
`al
`
`CONDITION CHECK (S241)
`
`CONNECTION (S243)
`
`- N S4
`
`S240 -
`
`SECONDARY SYSTEM
`CHECK MESSAGE(AP2)
`
`S244
`-- - )Z.
`
`S245 N--
`
`DATA COMMUNICATION
`
`-
`
`DATA COMMUNICATION
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 6 of 14
`
`US 2014/0106793 A1
`
`FIG. 6
`
`A.
`
`As
`
`DATACOMMUNICATION (FLOWO)(S302)
`
`s
`
`AAIDSA (FLOWI) (S304)
`
`SCN-CMD (AP 1,2,3)(S306)
`
`SCN-REP (AP 2.3) (S308)
`
`SS-CMD (ASSOCIATIONDEADLINE,
`ACTION TIME, AP 2, FLOWI) (S.310)
`
`MSG-ACK FORSS-CMD (S312)
`
`es
`
`e
`
`e
`
`BEACONFRAME (S314)
`
`AUTHENTICATION (S.316)
`
`ASSOCIATION (AID) (S318)
`
`-
`
`SS-IND (MACIPADDRESS OF
`802.11) (S320)
`
`DATA COMMUNICATION (FLOW 1) (S322)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 7 of 14
`
`US 2014/0106793 A1
`
`FIG.
`
`MULTRATMS
`
`DATA COMMUNICATION (FLOWO)(S302)
`
`DATA COMMUNICATION (FLOWI) (S304)
`
`SCN-CMD (AP 12.3) OR AAI DSX (S306)
`
`SCN-REP (AP 23) ORAAI DSX (S308)
`
`e
`
`as
`
`--
`
`SS-CMD (ASSOCIATION DEADLINE,
`AP3, FLOW I, DISCONNECTION,
`ACTION TIME) (S3LO)
`
`MSG-ACKFORSS-CMD (S312)
`
`e
`
`REASSOCTATION (REASON CODE) (S324)
`
`S326
`
`S328
`
`SECURITY CONTEXT
`
`SECURITY CONTEXT
`
`REASSOCIATIONAID) (S330)
`
`e
`
`e
`
`SS-IND(MACTP ADDRESS OF
`802.11) (S332)
`
`DATA COMMUNICATION (FLOWI) (S334)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 8 of 14
`
`US 2014/0106793 A1
`
`FIG. 8
`
`AP
`
`AP2
`
`ap)
`
`DATA COMMUNICATION (FLOW()) (S302)
`
`DATA COMMUNICATION (FLOWI) (S304)
`
`SCN-CMD (AP 1,2,3) OR AAI DSX (S306)
`
`SCN-REP (AP 2.3) OR AAI DSX (S308)
`
`SS-CMD (AP 2, FLOW I, DISCONNECTION
`& ACTION TIME) (S30")
`
`MSG-ACK FORSS-CMD (S32)
`
`-a-
`
`s
`
`-a-
`
`es
`
`DISASSOCIATION (REASON CODE) (S336)
`
`DATACOMMUNICATION (FLOWO, ) (S338)
`
`al
`
`SS-IND(MACIPADDRESS OF
`802.11)(S332)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 9 of 14
`
`US 2014/0106793 A1
`
`FIG. 9
`
`PACKET ACCESS
`ROUTER
`
`
`
`
`
`
`
`
`
`1. INTERNET ARS
`
`MULTRATMS
`
`62
`I
`Sl
`SERVER
`
`HOME AGENT
`
`GGSN ACCESS
`ROUTER
`OU
`
`ACCESS GATEWAY
`(SGSN)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 10 of 14
`
`US 2014/0106793 A1
`
`FIG 10
`
`at
`
`.
`
`As
`
`DATA COMMUNICATION (FLOWO)(S302)
`
`s
`
`e
`
`AAI DSA (FLOWI) (S304)
`
`SCN-CMD (AP 1,2,3) (S306)
`
`SCN-REP (AP 2.3) (S308)
`
`SS-CMD (PAGING MESSAGE
`TRANSMISSION INDICATION=1)(S311)
`
`MSG-ACK FORSS-CMD (S312)
`
`-
`
`BEACON FRAME (S3)4)
`
`AUTHENTICATION ($316)
`
`ASSOCIATION (AID)($318)
`
`SS-IND (MACIPADDRESS OF
`802.11) (S320)
`
`DATA COMMUNICATION (FLOW 1) (S322)
`
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`

`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 11 of 14
`
`US 2014/0106793 A1
`
`FIG 11
`
`BS (ABS)
`
`AA-DREG-REQ (S412)
`
`AAI-DREG-RSP (PAGING MESSAGE TRANSMISSION)
`INDICATION=1)(S414)
`
`FIG. 12A
`
`BS (ABS)
`
`AAI-DREG-RSP (PAGING MESSAGE TRANSMISSION)
`INDICATION=1)(S422)
`
`AA-DREG-REQ (S424)
`
`AAI-MSG-ACK (S426)
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 12 of 14
`
`US 2014/0106793 A1
`
`FIG. 12B
`
`MS
`
`BS (ABS)
`
`AAI-DREG-RSP (PAGING MESSAGE TRANSMISSION)
`INDICATION=1)(S432)
`
`AA-DREG-REQ (S434)
`
`AAI-DREG-RSP (S436)
`
`FIG. 13
`
`CELLULAR
`NETWORKBS
`
`s
`
`IDLEMODE N Y
`
`
`
`
`
`
`
`
`
`
`
`
`
`(g) UTUBE
`WFAP s
`
`
`
`
`
`
`
`DLEMODE
`
`
`
`( 8)
`Ya
`UTUBE
`NERE! WFAP
`
`() UTUBE
`
`r -
`WiFiAP
`CASE3
`
`TERNET
`&
`\
`
`s
`
`
`
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`

`Patent Application Publication
`
`Apr. 17, 2014 Sheet 13 of 14
`
`US 2014/0106793 A1
`
`(A
`A
`EA
`
`-
`
`17
`PAGING
`
`A
`{
`
`1.
`
`FIG. 14
`
`A. CELLULAR
`ANETWORKBS
`-
`
`IDLEMODE
`(()) UTUBE
`INTERNET
`WF ser
`N s
`
`FIG. 15A
`
`T}
`
`MULTI RATMS
`
`BS (ABS)
`
`PAGING MESSAGE INDICATION (SS12)
`
`e
`
`PAGING MESSAGE (SS14)
`
`IDLEMODE PROCEDURE
`(EX.NETWORKREENTRY) (SS16)
`
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`Patent Application Publication
`
`Apr. 17, 2014 Sheet 14 of 14
`
`US 2014/0106793 A1
`
`I -
`
`l
`
`PAGING MESSAGE (S522)
`
`FIG. 15B
`
`
`
`MULTIRATMS
`
`BS (ABS)
`
`IDLEMODE PROCEDURE
`(EX.NETWORKREENTRY) (SS24)
`
`FIG 16
`
`12
`
`MEMORY
`
`CONTROLLER
`
`13
`
`s
`
`RFUNIT
`
`20,30
`
`22
`
`MEMORY
`
`21 4. s
`
`CONTROLLER
`
`23
`
`RFUNIT
`
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`

`US 2014/0106793 A1
`
`Apr. 17, 2014
`
`METHOD AND APPARATUS FOR
`EFFICIENTLY PERFORMING PAGING INA
`WIRELESS ACCESS SYSTEM THAT
`SUPPORTSA MULTI-RADIO ACCESS
`TECHNOLOGY
`
`TECHNICAL FIELD
`
`0001. The disclosure relates to a radio access system sup
`porting a multi radio access technology (Multi RAT) and,
`more particularly, to a method and apparatus for efficiently
`performing paging.
`
`BACKGROUND ART
`
`0002 Conventionally, in a wireless communication envi
`ronment Supporting two or more heterogeneous networks,
`even if a mobile station has multi radio access technology
`(RAT) capability, the mobile station cannot simultaneously
`access a multi RAT network and thus the mobile station
`cannot simultaneously transmit and receive data to and from
`two or more heterogeneous networks.
`0003. That is, a mobile station supporting conventional
`multi RAT accesses any one RAT network based on switch
`ing, and transmits and receives data through one network.
`Thus, when the mobile station having the multi RAT capabil
`ity transmits and receives data through a specific network and
`then transmits and receives data to and from another network
`different from the specific network, transmission and recep
`tion of data to and from any one network are stopped.
`0004 Thus, conventionally, a mobile station having capa
`bility for Supporting two or more heterogeneous networks can
`perform communication through different networks. How
`ever, since the mobile station operates based on simple
`switching, the mobile station has limited efficiency. In addi
`tion, different networks operate independently of each other
`and thus the mobile station operates inefficiently in terms of
`overall flow management thereof.
`0005. In order to solve the above problem, a method of a
`mobile station having a multi RAT capability simultaneously
`transmitting and receiving data through two or more hetero
`geneous networks (a primary system and a secondary sys
`tem), i.e. through each network, has been defined. According
`to the above-defined method, an indirect scheme to improve
`network/user performance, network capability, and user Ser
`Vice quality is provided. For example, the mobile station
`having the multi RAT capability communicates with two
`access points. One is an access point of IEEE 802.11 and the
`other is an access point of IEEE 802.16. In addition, for
`example, the mobile station having the multi RAT capability
`may communicate with an integrated device having both an
`IEEE 802.16 interface and an IEEE 802.11 interface.
`0006. In general, the mobile station having the multi RAT
`capability may transmit and receive data corresponding to a
`specific service flow to and from the secondary system under
`control of the primary system. In the above-defined method,
`however, there is no definition as to whether the mobile sta
`tion simultaneously using the network of the primary system
`and the network of the secondary system continuously moni
`tors the network of the primary system in a case in which there
`is data traffic transmitted through the primary system but
`there is no data traffic transmitted through the secondary
`system.
`
`DISCLOSURE
`
`Technical Problem
`0007 An object of the disclosure devised to solve the
`problem lies in providing a method of defining a status of a
`mobile station having multi, i.e. two or more, MAC/PHY
`layers, specifically an idle mode, and efficiently receiving a
`paging message and a mobile station using Such a method.
`
`Technical Solution
`0008. The object of the disclosure can be achieved by
`providing a method of a mobile station receiving a paging
`message of a primary base station, the mobile station being
`capable of transmitting and receiving data to and from the
`primary base station Supporting a primary radio access tech
`nology (RAT) and a secondary base station Supporting a
`secondary RAT in a radio access system Supporting a multi
`RAT according to a first embodiment of the disclosure, the
`method including establishing association with the primary
`base station, receiving a secondary base station association
`command message including a paging message transmission
`indication from the primary base station, establishing asso
`ciation with the secondary base station in response to the
`secondary base station association command message, and
`monitoring the paging message of the primary base station
`through the primary base station or the secondary base station
`based on the paging message transmission indication.
`0009. In an embodiment, the monitoring step may include
`receiving a paging message indication from the secondary
`base station and receiving the paging message from the pri
`mary base station.
`0010. In addition, in an embodiment, the monitoring step
`may include receiving a paging message from the secondary
`base station.
`0011. In addition, in an embodiment, the monitoring step
`may include receiving an indication of network reentry into
`the primary base station from the secondary base station. In
`addition, in an embodiment, the method may further include
`performing network reentry into the primary base station in
`response to the network reentry indication.
`0012. In addition, in an embodiment, the monitoring step
`may include receiving a paging message or a paging indica
`tion message from a paging controller or the primary base
`station through the secondary base station. In addition, in an
`embodiment, the monitoring step may further include, upon
`receiving a message corresponding to an IP address of the
`paging controller oran IP address of the primary base station,
`recognizing the received message as a paging message.
`0013. In addition, in an embodiment, location update for
`the primary base station may not be performed during asso
`ciation with the secondary base station.
`0014. In addition, in an embodiment, the method may
`further include performing data communication with the sec
`ondary base station and, upon completion of data communi
`cation with the secondary base station in an idle mode,
`informing the primary base station of paging message moni
`toring from the primary base station.
`0015. In addition, in an embodiment, the informing step
`may include performing location update for the primary base
`station.
`0016. In addition, in an embodiment, the secondary base
`station association command message may include AAI-SS
`CMD.
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`US 2014/0106793 A1
`
`Apr. 17, 2014
`
`0017. In addition, in an embodiment, the method may
`include, before the monitoring step, receiving a message
`related to entry into an idle mode from the primary base
`station and entering the idle mode in response to the message
`related to entry into the idle mode.
`0018. In addition, in an embodiment, the method may
`further include, before the monitoring step, performing data
`communication with the secondary base station and perform
`ing deregistration from the primary base station.
`0019. In addition, in an embodiment, the primary RAT
`may include a wide band RAT and the secondary RAT may
`include a local area RAT. In addition, in an embodiment, the
`wide band RAT may include a RAT supporting 802.16 and the
`local area RAT may include a RAT supporting 802.11.
`0020. Meanwhile, the object of the disclosure can be
`achieved by providing a mobile station capable of transmit
`ting and receiving data to and from the primary base station
`Supporting a primary radio access technology (RAT) and a
`secondary base station Supporting a secondary RAT in a radio
`access system supporting a multi RAT according to a first
`embodiment of the disclosure, the mobile station including a
`radio frequency unit for transmitting and receiving a radio
`signal to and from an external device and a controller con
`nected to the radio frequency unit, wherein the controller
`establishes association with the primary base station, controls
`the radio frequency unit to receive a secondary base station
`association command message comprising a paging message
`transmission indication from the primary base station, and
`monitors a paging message of the primary base station
`through the primary base station or the secondary base station
`based on the paging message transmission indication.
`0021 Meanwhile, the object of the disclosure can be
`achieved by providing a method of a mobile station receiving
`a paging message of a primary base station, the mobile station
`being capable of transmitting and receiving data to and from
`the primary base station Supporting a primary radio access
`technology (RAT) and a secondary base station Supporting a
`secondary RAT in a radio access system Supporting a multi
`RAT according to a first embodiment of the disclosure, the
`method including receiving a message related to entry into an
`idle mode comprising a paging message transmission indica
`tion from the primary base station, entering the idle mode in
`response to the message related to entry into the idle mode,
`and monitoring the paging message of the primary base sta
`tion through the primary base station or the secondary base
`station based on an indication indicating whether the paging
`message will be monitored.
`0022. In an embodiment, the monitoring step may include
`receiving a paging message indication from the secondary
`base station and receiving the paging message from the pri
`mary base station.
`0023. In addition, in an embodiment, the monitoring step
`may include receiving a paging message from the secondary
`base station.
`0024. In addition, in an embodiment, the message related
`to entry into the idle mode may include AAI-DREG-RSP.
`
`Advantageous Effects
`
`0025. According to embodiments of the disclosure, it is
`possible for a mobile station having multi, i.e. two or more,
`MAC/PHY layers, to efficiently receive a paging message.
`
`DESCRIPTION OF DRAWINGS
`0026 FIGS. 1A and 1B are conceptual views showing a
`multiradio access technology (Multi RAT) network to which
`an embodiment of the disclosure may be applied.
`0027 FIG. 2 is a flowchart showing a method of a multi
`RAT mobile station transmitting and receiving data through a
`primary system and a secondary system.
`0028 FIG.3 is a flowchart showing a multiRAT capability
`negotiation procedure between the multi RAT mobile station
`and the primary system.
`0029 FIG. 4 is a flowchart showing a scanning procedure
`of the multi RAT mobile station on the secondary system.
`0030 FIG. 5 is a flowchart showing a procedure of adding
`a secondary system in a secondary system management
`method, i.e. a procedure in which the multi RAT mobile
`station accesses the secondary system.
`0031
`FIG. 6 is a flowchart showing a procedure in which
`the multiRAT mobile station is associated with the secondary
`system.
`0032 FIG. 7 is a flowchart showing a procedure in which
`the multi RAT mobile station is reassociated with the second
`ary system.
`0033 FIG. 8 is a flowchart showing a procedure in which
`the multi RAT mobile station is disassociated from the sec
`ondary system.
`0034 FIG. 9 is conceptual view showing a multi radio
`access technology (Multi RAT) network to which an embodi
`ment of the disclosure may be applied.
`0035 FIG. 10 is a view showing a procedure in which a
`multi RAT mobile station according to an embodiment of the
`disclosure is associated with a secondary system.
`0036 FIG. 11 is a view showing a mobile station idle
`mode entry procedure commenced by a mobile station
`according to an embodiment of the disclosure.
`0037 FIGS. 12A and 12B are views showing a mobile
`station idle mode entry procedure commenced by a base
`station according to an embodiment of the disclosure.
`0038 FIG. 13 is conceptual view showing a multi radio
`access technology (Multi RAT) network to which another
`embodiment of the disclosure may be applied.
`0039 FIG. 14 is a conceptual view showing a procedure in
`which a multi RAT mobile station according to an embodi
`ment of the disclosure receives a paging message through a
`secondary system.
`0040 FIGS. 15A and 15B are conceptual views showing a
`procedure in which a multi RAT mobile station according to
`an embodiment of the disclosure transmits a paging message
`through a secondary system.
`0041
`FIG. 16 is an internal block diagram of a mobile
`station and base stations in a radio access system to which
`embodiments of the disclosure may be applied.
`
`BEST MODE
`0042. The following technologies may be used in various
`wireless communication systems such as code division mul
`tiple access (CDMA), frequency division multiple access
`(FDMA), time division multiple access (TDMA), orthogonal
`frequency division multiple access (OFDMA), and single
`carrier frequency division multiple access (SC-FDMA).
`0043 CDMA may be implemented as a radio technology
`such as universal terrestrial radio access (UTRA) or
`CDMA2000. TDMA may be implemented as a radio tech
`nology Such as global system for mobile communications
`
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`(GSM), general packet radio service (GPRS), and enhanced
`data rates for GSM evolution (EDGE). OFDMA may be
`implemented as radio technology Such as institute of electri
`cal and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE
`802.16 (WiMAX), IEEE 802.20, and evolved-UTRA
`(E-UTRA). IEEE 802.16m is an evolved version of IEEE
`802.16e and provides backward compatibility with a system
`based on IEEE 802.16e.
`0044 UTRA is a part of universal mobile telecommuni
`cation system (UMTS).
`0045. Third generation partnership project (3GPP) long
`term evolution (LTE) is a part of evolved UMTS (E-UMTS)
`using evolved-UMTS terrestrial radio access (E-UTRA) and
`employs OFDMA on downlink and SC-FDMA on uplink.
`LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.
`0046. Hereinafter, the disclosure will be described in
`detail by explaining exemplary embodiments of the invention
`with reference to the accompanying drawings. The same ref
`erence numerals in the drawings denote like elements, and a
`repeated explanation thereofwill not be given. In the descrip
`tion of the disclosure, certain detailed explanations of the
`related art are omitted when it is deemed that they may unnec
`essarily obscure the essence of the invention. The features of
`the disclosure will be more clearly understood from the
`accompanying drawings and should not be limited by the
`accompanying drawings. It is to be appreciated that all
`changes, equivalents, and Substitutes that do not depart from
`the spirit and technical scope of the disclosure are encom
`passed in addition to the accompanying drawings in the dis
`closure.
`0047. Hereinafter, a method in which, in a multi RAT
`network proposed in the disclosure, a mobile station accesses
`two or more heterogeneous networks (or the multi RAT net
`work) and simultaneously transmits and receives data
`through the networks will be described.
`Multi Radio Access Technology (RAT) Network
`0.048
`First, a multi RAT network, to which an embodi
`ment of the disclosure may be applied, will be described
`below.
`0049 FIGS. 1A and 1B are conceptual views showing a
`multiradio access technology (Multi RAT) network to which
`an embodiment of the disclosure may be applied.
`0050. A multi radio access technology (hereinafter,
`referred to as a multi RAT) network refers to a wireless
`communication environment in which two or more heteroge
`neous networks coexist and a mobile station accesses the two
`or more heterogeneous networks to simultaneously perform
`communication.
`0051. Here, a mobile station that is capable of simulta
`neously communicating with two or more heterogeneous net
`works may also be referred to as a multi RAT mobile station
`or a multi system mobile station.
`0052. In a specific network, a heterogeneous network (or a
`heterogeneous system) refers to a network using a communi
`cation method different from a communication method used
`in the specific network.
`0053 For example, a worldwide interoperability for
`microwave access (WiMAX) network and a wireless fidelity
`(WiFi) network as an example of a mobile communication
`system correspond to heterogeneous networks.
`0054 RAT is a technology type used in radio access.
`Examples of RAT may include GSM/EDGE radio access
`network (GERAN), UMTS terrestrial radio access network
`
`(UTRAN), evolved-UMTS terrestrial radio access network
`(E-UTRAN), WiMAX, LTE(-A), and WiFi. That is, GERAN,
`UTRAN, E-UTRAN, WiMAX, and/or WiFi coexist in the
`SaC aca.
`0055 As shown in FIGS. 1A and 1B, a multi RAT network
`100 may include a primary system 110 and a secondary
`system 120.
`0056. Here, the primary system 110 and the secondary
`system 120 may be referred to as a primary network and a
`secondary network, respectively. The primary system 110
`may include a multi RAT mobile station 10, a base station 20,
`and the secondary system 120. The secondary system 120
`may include the multi RAT mobile station 10 and an access
`point (AP)30.
`0057 The primary system may have coverage of a wide
`range and may be a mobile communication system. In addi
`tion, the primary system may have a function to transmit
`control information. For example, the primary system may be
`a WiMAX or LTE(-A) system. In addition, the primary sys
`tem is always in a predetermined status with respect to the
`multi RAT mobile station. That is, the primary system main
`tains an active status, a sleep mode status, or an idle mode
`status with respect to the multi RAT mobile station. The multi
`RAT mobile station may be first associated with the primary
`system.
`0058. The secondary system may have coverage of a small
`range and may be a wireless local area network (WLAN)
`system. In addition, the secondary system may have a func
`tion to transmit data. For example, the secondary system may
`be a Wi-Fi system. That is, the secondary system may be
`added to or deleted from the multi RAT network as needed. In
`addition, the secondary system may be used for data trans
`mission and reception which mainly requires a higher band
`width (BW). Thus, mapping may be performed on a specific
`flow (quality of service (QoS)) in order to use the secondary
`system. Association or disassociation between the secondary
`system and the multi RAT mobile station may be performed
`after checking from the primary system.
`0059. That the multiRAT mobile station is associated with
`the secondary system may mean that the multi RAT mobile
`station is ready to transmit and receive data to and from the
`secondary system or that the multi RAT mobile station trans
`mits and receives data to and from the secondary system.
`Upon detecting that the multi RAT mobile station enters the
`coverage of the secondary system, the multi RAT mobile
`station may receive information about access to the secondary
`system from the primary system. In this case, real data trans
`mission and reception may not be immediately performed. In
`addition, in a case in which the multi RAT mobile station has
`data to be transmitted and received through the secondary
`system, the multi RAT mobile station may receive access
`information about a corresponding flow from the primary
`system. In this case, real data transmission and reception may
`be immediately performed.
`0060 Herein, the AP as an example of a base station of the
`secondary system, may operate in the same way as a mobile
`station capable of communicating with the primary system.
`0061. In addition, the primary system and the secondary
`system are connected to each other in a wired or wireless
`manner in the multiRAT network. That is, a base station of the
`primary system and a base station of the secondary system
`may be connected to each other through a backbone network
`in a wired manner (FIG. 1B) or in a wireless manner (FIG.
`1A).
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`0062 Hereinafter, for the convenience of description, it
`will be assumed that the primary system is a WiMAX system
`and the secondary system is a Wi-Fi system unless otherwise
`mentioned. Accordingly, a base station corresponding to the
`primary system will be referred to as a BS or an ABS and
`a base station corresponding to the secondary system will be
`referred to as an AP. In addition, hereinafter, access to the
`primary system may have the same meaning as access to the
`base station (or the ABS) and access to the secondary system
`may have the same meaning as access to the AP.
`0063 FIG. 2 is a flowchart showing a method of a multi
`RAT mobile station transmitting and receiving data through a
`primary system and a secondary system.
`0064. Referring to FIG. 2, the multi RAT mobile station
`executes an initial network entry procedure to a base station
`(S210).
`0065. The multi RAT mobile station transmits an indicator
`indicating that the multi RAT mobile station supports multi
`RAT to the base station through the initial network entry
`procedure to the base station. Here, the indicator may be a
`multi RAT mobile station capability field. In addition, the
`indicator, i.e. the multi RAT mobile station capability field,
`may have a size of 1 bit.
`0066. In addition, the indicator may be transmitted
`through a registration procedure performed during the initial
`network entry procedure to the base station. In this case, the
`indicator may be transmitted to the base station through a
`registration request or registration response message (REG
`REQ/RSP message).
`0067 For example, when the indicator is set to 1, the
`indicator indicates that the multiRAT mobile station supports
`multi RAT. When the indicator is set to 0', on the other hand,
`the indicator indicates that the multiRAT mobile station does
`not support multi RAT.
`0068. In addition, when the base station receives a regis
`tration request or registration response message including an
`indicator (e.g., an indicator set to 1) indicating that the multi
`RAT mobile station has capability for supporting multi RAT
`from the multi RAT mobile station, the base station may
`transmit, to the multi RAT mobile station, notification infor
`mation indicating that a separate multi RAT capability nego
`tiation procedure for supporting the multiRAT mobile station
`will be performed after the initial network entry procedure is
`completed or a predetermined time elapses.
`0069. For example, when the notification information is
`set to 1, the notification information indicates that the base
`station and the multi RAT mobile station perform the separate
`multi RAT capability negotiation procedure in order to Sup
`port multi RAT. When the notification information is set to
`0', on the other hand, the notification information indicates
`that the separate multi RAT capability negotiation procedure
`does not have to be performed.
`0070. Subsequently, when the multi RAT mobile station
`and the base station complete the initial network entry pro
`cedure, the multi RAT mobile station and the base station
`perform a multi RAT capability negotiation procedure
`(S220). In general, the multi RAT capability negotiation pro
`cedure is performed after a network (re-)entry procedure is
`completed. However, the multi RAT capability negotiation
`procedure may also be performed during the network (re-)
`entry procedure to the base station.
`0071. For example, when the multi RAT capability nego
`tiation procedure is performed during the network (re-)entry
`procedure, the multi RAT mobile station and the base station
`
`may perform the multi RAT capability negotiatio