USOO7606226B2
`
`(12) United States Patent
`Yi et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7.606,226 B2
`Oct. 20, 2009
`
`(54) MULTIMEDIASERVICE PROVIDING
`METHOD AND RADIO MOBILE
`COMMUNICATION SYSTEM
`(75) Inventors: Seung-June Yi, Seoul (KR); Young-Dae
`Lee, Gyunggi-Do (KR); So-Young Lee,
`Gyunggi-Do (KR)
`
`(73) Assignee: LG Electronics Inc., Seoul (KR)
`(*) Notice:
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 918 days.
`(21) Appl. No.: 10/601,191
`
`(22) Filed:
`
`Jun. 23, 2003
`
`(65)
`
`Prior Publication Data
`US 2004/OO57387 A1
`Mar. 25, 2004
`
`Foreign Application Priority Data
`(30)
`Jun. 22, 2002
`(KR) ...................... 10-2002-0035179
`
`(51) Int. Cl.
`(2006.01)
`H04L 2/28
`(52) U.S. Cl. ....................................... 370/390; 370/392
`(58) Field of Classification Search ....................... None
`See application file for complete search history.
`References Cited
`
`(56)
`
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`(Continued)
`OTHER PUBLICATIONS
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`(Continued)
`Primary Examiner Michael J Moore, Jr.
`(74) Attorney, Agent, or Firm—McKenna Long & Aldridge
`LLP
`
`(57)
`
`ABSTRACT
`
`A multimedia broadcast/multicast service (MBMS) in a uni
`versal mobile telecommunications system (UMTS) includes
`a UTRAN that provides an MBMS service. The MBMS ser
`vice-related information is exchanged between the UTRAN
`and a terminal or between nodes in the UTRAN by using an
`MBMS identification so that a user group receiving MBMS
`data or a data of a specific MBMS service can be identified.
`
`27 Claims, 8 Drawing Sheets
`
`Terminal
`
`UTRAN
`
`RRC
`
`MAC-Clsh
`
`MAC-Clsh
`
`
`
`
`
`
`
`Store RNT
`
`Generate RNT for MBMS service
`when MBMS RAB is set
`
`
`Ex.1007 / Page 1 of 17Ex.1007 / Page 1 of 17
`
`TESLA, INC.TESLA, INC.
`
`

`

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`9, 2002 Hatakar
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`2003, OO16698 A1
`8, 2003 Sarkkinen et al.
`2003. O157949 A1
`2003. O194992 A1 10, 2003 Kim et al.
`2003/0207696 A1 1 1/2003 Willenegger et al.
`2004.0017809 A1
`1, 2004 Park
`2004/0022218 A1
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`4/2004 Koulakiotis et al.
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`8/2004 Kuwano et al.
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`9, 2006 Lee et al.
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`US 7,606,226 B2
`Page 2
`
`102003OO29310
`KR
`2003-0069365. A
`KR
`102004OO64869
`KR
`102005OO14984
`KR
`WO99/44313
`WO
`WOOO,54521
`WO
`WO WO 2001/O5158
`WO
`WO 01/10146
`WO
`WOO2,33937
`WO
`WO O2/41531
`WO
`WOO3,O98871
`WO
`WOO3,105.353
`WO WO 2004/017540
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`2, 2005
`7/2005
`
`OTHER PUBLICATIONS
`
`Harri Holma and Antti Toskala: “WCDMA for UMTSWCDMA for
`UMTS: Radio Access for Third Generation Mobile Communica
`tions, Jun. 7, 2000, pp. 123-127.
`“Multicasting in UMTS'. Palat, S.K.; Weerasekera, I.N.: Casata, A.,
`3G Mobile Communication Technologies 2002 (Third International
`Conference on May 8-10, 2002, pp. 96-101.
`LG Information & Communication, Ltd. Korea: "Definitions and
`Characteristics of Multicast Channels' TSG RAN Working Group 2
`(Radio Layer 2 and Radio Layer 3), Mar. 8, 1999, -Mar. 11, 1999
`XPOO2275698 Stockholm.
`"3" Generation Partnership Project, Technical Specification Group
`Services and System Aspects; Multimedia Broadcast/Multicast Ser
`vice; Stagel (Release 5); 3GPP Organizational Partners, published
`Mar. 2002, 3GPP TS 22.146 V5.2.0.
`Holma, Harri, et al., “WCDMA for UMTS” WCDMA for UMTS:
`Radio Access for Third Generation Mobile Communications, p.
`75-77, 123-127 and 135-151, Jun. 7, 2000.
`LG Information & Communications, Ltd. Korea "Definitions and
`Characteristics of Multicast Channels Document for: Proposal of
`Multicast Channels' TSG-RAN Working Group 2 (Radio layer 2 and
`Radio layer 3); TSGR2#2(99)076; (Mar. 8-11, 1999 in Stockholm).
`3' Generation Partnership Project ; Technical Specification Group
`Services and System Aspects; Multimedia Broadcast/Multicast Ser
`vice (MBMS); Architecture and Functional Description (Release 6),
`3GPP TS 23.246 V6.1.0, Dec. 2003.
`“Some Considerations on the L2 Design of the RB Carrying MBMS
`(update).” Phillips, 10.2.1. TSG-RAN Working Group 2 (Radio
`Layer 2 and Radio Layer 3), TSGR2#37(03)2146, Budapost, Hun
`gary, Aug. 25-29, 2003.
`WCDMA Technology and System Design, by Harri Holma & Antti
`Toskala, published by Mechanical Industry Press, Jan. 31, 2002.
`* cited by examiner
`
`
`Ex.1007 / Page 2 of 17Ex.1007 / Page 2 of 17
`
`TESLA, INC.TESLA, INC.
`
`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 1 of 8
`
`US 7.606,226 B2
`
`FG.1
`BACKGROUND ART
`
`
`
`lu Interface
`
`
`Ex.1007 / Page 3 of 17Ex.1007 / Page 3 of 17
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`TESLA, INC.TESLA, INC.
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`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 2 of 8
`
`US 7.606,226 B2
`
`8
`
`
`
`
`
`
`
`FIG.2
`BACKGROUND ART
`
`Control Plane
`
`User Plane
`
`s
`8
`
`d
`
`-
`
`- - -
`
`-
`
`PD
`
`|- -- - E- --
`Ps
`SC
`
`R E. R L E R sic
`
`RRC
`(Third Layer)
`
`Radio
`
`Bearers
`POCP
`(Second Layer)
`
`BMC
`
`(Second Layer)
`
`
`
`
`
`
`
`Ric
`
`RLC
`(Second Layer)
`
`R L
`
`
`
`
`
`rLogical Channel
`
`MAC
`(Second Layer)
`rair-ir-irr. Transport Channel
`
`PHY
`(First Layer)
`
`
`Ex.1007 / Page 4 of 17Ex.1007 / Page 4 of 17
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`TESLA, INC.TESLA, INC.
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`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 3 of 8
`
`US 7.606,226 B2
`
`Terminal
`
`RRC
`
`MAC-Clsh
`
`Generate RNT for MBMS service
`when MBMS RAB is set
`
`
`
`
`
`Store RNT
`
`FIG.4
`
`Terminal
`
`UTRAN
`
`
`
`
`
`
`
`
`
`
`
`Assign RNTI(S4)
`
`Complete RNT assignment(S7
`
`
`Ex.1007 / Page 5 of 17Ex.1007 / Page 5 of 17
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`TESLA, INC.TESLA, INC.
`
`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 4 of 8
`
`US 7.606,226 B2
`
`FIG.5
`
`Terminal
`
`
`
`MAC-Clsh
`
`Compare RNT of received MAC PDU
`and stored RNT
`
`13
`
`
`
`Transfer received MBMS data to
`upper layer in case that two RNTI are
`the same with each other
`
`FIG.6
`
`Terminal
`
`UTRAN
`
`MAC-Clsh
`
`MAC-Clsh
`
`
`
`Re
`
`uest RNT discard(S14)
`
`Request RNT discard(S15)
`
`
`
`Discard RNT
`
`ompl to RNT discard (S.17)
`
`
`
`
`
`
`
`
`
`
`
`
`Ex.1007 / Page 6 of 17Ex.1007 / Page 6 of 17
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`TESLA, INC.TESLA, INC.
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`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 5 of 8
`
`US 7.606,226 B2
`
`FIG.7
`
`Terminal
`
`UTRAN
`
`RRC
`
`MAC-Clsh
`
`MAC-clish
`
`
`
`Determine
`RNT discard
`
`
`
`Request
`RNTI discard (S21)
`
`Discard RNT
`
`FIG.8
`
`Terminal
`
`Transmit
`hannel Information(S24
`
`
`
`Assign MBMS RNTI to terminal
`
`
`
`
`
`Store
`Channel information
`
`
`
`Obtain channel information
`indicated by RNT from the
`storod channot information
`
`Set w r lay r (S28)
`
`
`
`
`Ex.1007 / Page 7 of 17Ex.1007 / Page 7 of 17
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`TESLA, INC.TESLA, INC.
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`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 6 of 8
`
`US 7.606,226 B2
`
`
`
`FG 9)
`
`SENDING AMESSAGE CONTAINING AN
`
`DENTIFICATION CODE
`
`RECEIVING THE MESSAGE AT A FIRST UPPER
`
`LAYER OF THE USEREGUPMENT
`
`DETERMINING WHETHER TO PASS THE
`
`MESSAGE TO A SECOND UPPER LAYER OF
`
`THE USEREQUIPMENT
`
`
`Ex.1007 / Page 8 of 17Ex.1007 / Page 8 of 17
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`TESLA, INC.TESLA, INC.
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`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 7 of 8
`
`US 7.606,226 B2
`
`FIG 10
`
`111
`
`SENDING AMESSAGE CONTAINING ANDENTIFICATION CODE
`
`RECEIVING THE MESSAGE AT A FIRST UPPERLAYER OF UE
`
`112
`
`
`
`
`
`
`
`
`
`S THERE A MATCHING
`DENTIFICATION CODE
`N THE FIRST UPPER
`LAYER OF THE UE2
`
`YES
`
`114
`
`
`
`PASS THE MESSAGE TO A
`
`SECOND UPPERLAYER OF UE
`
`
`Ex.1007 / Page 9 of 17Ex.1007 / Page 9 of 17
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`TESLA, INC.TESLA, INC.
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`

`

`U.S. Patent
`
`Oct. 20, 2009
`
`Sheet 8 of 8
`
`US 7.606,226 B2
`
`
`
`FG 11
`
`GENERATING AMESSAGE INCLUDING ANDENTIFICATION
`
`CODE FIELD CORRESPONDING TO A SPECIFIC MBMS
`
`TRANSMITTING THE MESSAGE FOR RECEPT BY THE FIRST
`
`UPPER LAYER OF THE USEREQUIPMENT
`
`PERMITTING THE UE TO DETERMINE WHETHER TO PASS THE
`
`RECEIVED MESSAGE TO TS SECOND UPPER LAYER
`
`
`Ex.1007 / Page 10 of 17Ex.1007 / Page 10 of 17
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`

`US 7,606,226 B2
`
`1.
`MULTIMEDIASERVICE PROVIDING
`METHOD AND RADIO MOBILE
`COMMUNICATION SYSTEM
`
`This application claims the benefit of the Korean Applica
`tion No. P2002-35179 filed on Jun. 22, 2002, which is hereby
`incorporated by reference for all purposes as if fully set forth
`herein.
`
`BACKGROUND OF THE INVENTION
`
`10
`
`15
`
`25
`
`1. Field of the Invention
`The present invention relates to a telecommunication sys
`tem and, more particularly, to a multimedia broadcast/multi
`cast service (MBMS) of a universal mobile telecommunica
`tions system (UMTS).
`2. Discussion of the Related Art
`A universal mobile telecommunications system (UMTS) is
`a third generation mobile communication system that has
`evolved from a standard known as Global System for Mobile
`communications (GSM). This standard is a European stan
`dard which aims to provide an improved mobile communi
`cation service based on a GSM core network and wideband
`code division multiple access (W-CDMA) technology.
`It is noted that for the purpose of creating a specification for
`standardizing the UMTS, Various organizations around the
`world including ETSI of Europe, the ARIB/TTC of Japan, the
`T 1 of the United States and the TTA of Korea formed a Third
`Generation Partnership Project (3GPP). Many standard fea
`tures of the UMTS are being adopted by 3GPP
`30
`FIG. 1 illustrates an example of the construction of agen
`eral UMTS network.
`As shown in FIG. 1, a UMTS includes a terminal (UE), a
`UMTS terrestrial radio access network (UTRAN) and a core
`network. The UTRAN includes one or more radio network
`sub-systems (RNS). Each RNS includes one radio network
`controller (RNC) and one or more Node Bs managed by the
`RNC. Each Node B, managed by the RNC, receives informa
`tion sent by the physical layer of the terminal through an
`uplink, and transmits data to the terminal (UE) through a
`downlink. Thus, Node B's operate as access points of the
`UTRAN for the terminal.
`A primary function of the UTRAN is to constitute and
`maintain a radio access bearer (RAB) for a communication
`between the terminal and the core network. The core network
`applies requirements for a quality of service of an end-to-end
`to the RAB, and the RAB supports the QoS requirement the
`core network 130 sets.
`Accordingly, by constituting and maintaining the RAB, the
`UTRAN can satisfy the QoS requirement of the end-to-end.
`The RAB service can be divided into lower Iu Bearer service
`and Radio Bearer service. The Iu Bearer service handles a
`reliable transmission of a user data in the boundary node
`between the UTRAN and the core network, while the radio
`bearer service handles a reliable transmission of a user data
`between the terminal and the UTRAN.
`FIG. 2 shows a structure of a radio protocol between a
`terminal which operates based on a 3GPP RAN specification
`and a UTRAN. The radio protocol is horizontally formed of a
`physical layer (PHY), a data link layer, and a network layer
`and is vertically divided into a control plane for transmitting
`a control information and a user plane for transmitting data
`information. The user plane is a region to which traffic infor
`mation of a user Such as voice or an IP packet is transmitted.
`The control plane is a region to which control information
`65
`Such as an interface of a network or maintenance and man
`agement of a call is transmitted.
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`2
`In FIG. 2, protocol layers can be divided into a first layer
`(L1), a second layer (L2), and a third layer (L3) based on three
`lower layers of an open system interconnection (OSI) stan
`dard model well known in a communication system. Each
`layer of FIG. 2 will now be described.
`The first layer (L1) provides information transfer service to
`an upper layer by using various radio transmission tech
`niques. It is connected to an MAC (Medium Access Control)
`layer at the upper position through a transport channel, and
`data between the MAC layer and a physical layer are moved
`through the transport channel.
`The MAC provides assignment service of an MAC param
`eter for assigning and re-assigning a radio resource. It is
`connected to a radio link control layer, an upper layer, by a
`logical channel, and various logical channels are provided
`according to the kind of transmitted information. In general,
`when information of the control plane is transmitted, a control
`channel is used. When information of the user plane is trans
`mitted, a traffic channel is used.
`The MAC is classified into MAC-b sublayer, MAC-d sub
`layer and MAC-c/sh sublayer according to the type of trans
`port channel it manages. The MAC-b. Sublayer manages a
`broadcast channel (BCH), a transport channel handling
`broadcast of system information. The MAC-c/sh sublayer
`manages a common or shared transport channel Such as the
`FACH or a DSCH (Downlink Shared Channel) shared by
`multiple terminals.
`In the UTRAN, the MAC-c/sh sublayer is positioned in the
`CRNC. Since the MAC-c/sh sublayer manages channels
`shared by every terminal in a cell, one MAC-c/sh sublayer
`exists in each cell. The MAC-d sublayer manages a dedicated
`channel (DCH), a dedicated transport channel for a specific
`terminal. Therefore, the MAC-d sublayer is positioned at the
`SRNC handling management of a corresponding terminal
`and one MAC-d sublayer exists in each terminal.
`The RLC layer supports reliable data transmission and
`performs a function of segmentation and concatenation of
`RLC service data unit (SDU) coming down from an upper
`layer.
`The RLCSDU delivered from the upper layer is adjusted in
`its size Suitable for a processing capacity in the RLC layer, to
`which header information is added and transmitted as a pro
`tocol data unit form to the MAC layer. The RLC layer has an
`RLC buffer to store RLC SDU or PDUs coming down from
`the upper layer.
`A broadcast/multicast control (BMC) layer schedules a
`cell broadcast (CB) message delivered from the core network
`and allows user equipments positioned in a specific cell to
`perform a broadcast function.
`At the side of the UTRAN, the CB message delivered from
`the upper layer is added with information Such as a message
`ID, a serial number or a coding scheme and transmitted as the
`BMC message form to the RLC layer, and transmitted to the
`MAC layer through the logical channel CTCH (Common
`Traffic Channel). The logical channel CTCH is mapped with
`the transport channel FACH and S-CCPCH.
`A packet data convergence protocol (PDCP) layer is posi
`tioned at an upper side of the RLC layer and allows data to be
`transmitted through a network protocol such as an IPv4 or
`IPv6 to be effectively transmitted on the radio Interface with
`a relatively small bandwidth. For this purpose, the PDCP
`layer performs a function of reducing unnecessary control
`information, which is called a header compression, and
`RFC2507 and RFC3095, a header compression technique
`defined in an Internet standardization group called IETF (In
`ternet Engineering Task Force). With these methods, because
`the header part is allowed to transmit only essential informa
`
`
`Ex.1007 / Page 11 of 17Ex.1007 / Page 11 of 17
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`US 7,606,226 B2
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`30
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`3
`tion, less control information is transmitted, thereby reducing
`a quantity of data to be transmitted.
`The radio resource control (RRC) layer positioned in the
`lowest portion of the L3 is defined only in the control plane
`and controls the logical channels, the transport channels, and
`the physical channels in relation to the setup, the reconfigu
`ration, and the release of the RBs. The RB is a service pro
`vided by the second layer for data transmission between the
`terminal and the UTRAN. Setting up the RB means processes
`of stipulating the characteristics of a protocol layer and a
`channel, which are required for providing a specific service,
`and setting the respective detailed parameters and operation
`methods.
`The multimedia broadcast/multicast service (MBMS) will
`now be described.
`The MBMS is a service transmitting multimedia data such
`as an audio, a video or an image to a plurality of terminals by
`using a uni-directional point-to-multipoint bearer service.
`UTRAN transmits the MBMS data over a downlink common
`transport channel such as FACH or DSCH in order to heighten
`an efficiency of a radio network.
`The MBMS has two types of modes of a broadcast mode
`and a multicast mode. Namely, the MBMS service is divided
`into an MBMS broadcast service and an MBMS multicast
`service.
`The MBMS broadcast mode is a service transmitting mul
`timedia data to every user located in a broadcast area. The
`broadcast area herein refers to an area where a broadcast
`service is available. One or more broadcast areas can exist in
`one public land mobile network (PLMN), and one or more
`broadcast services can be provided in one broadcast area.
`Further, one broadcast service can be provided to several
`broadcast areas.
`The MBMS multicast mode is a service for transmitting
`multimedia data only to a specific user group in a multicast
`area. Here, the multicast area refers to an area where a mul
`ticast service is available. There can exist one or more multi
`cast areas in one PLMN, and one or more multicast services
`can be provided in one multicast area. Further, one multicast
`service can be provided to several multicast areas.
`In the MBMS multicast mode, a user is required to join a
`multicast group for receiving a specific multicast service.
`Here, the multicast group refers to a user group receiving a
`specific multicast service, and joining herein refers to a
`behavior of joining to the multicast group for receiving the
`specific multicast service.
`The radio network temporary identifier (RNTI) will now be
`described.
`The RNTI is used as identification information of a termi
`nal while connection is maintained between the terminal and
`the UTRAN, including S-RNTI, D-RNTI, C-RNTI and
`U-RNTI.
`S-RNTI (Serving RNC RNTI) is assigned by an SRNC
`(Serving RNC) when a connection is set up between the
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`terminal and the UTRAN, and used as base information for
`the SRNC to identify a terminal.
`D-RNTI (Drift RNTI) is assigned by a DRNC (Drift RNC)
`when a handover occurs between radio network controllers
`according to a terminals movement.
`C-RNTI (Cell RNTI) is used as information to identify a
`terminal in an CRNC (Controlling RNC) and given a new
`C-RNTI value from the CRNC when a terminal enters a new
`cell.
`U-RNTI (UTRAN RNTI) consists of an SRNC identity
`and an S-RNTI and provides absolute identification informa
`tion of a terminal in case that identification information of an
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`SRNC managing a terminal and identification information of
`a terminal in the corresponding terminal can not be recog
`nized.
`When data is transmitted by using a common transport
`channel, an MAC-c/sh layer includes C-RNTI or U-RNTI in
`a header of an MAC PDU and transmits it. At this time, the
`header of the MAC PDU also includes a UEID type indicator
`informing a type of the RNTI.
`One or more physical channel S-CCPCH (Secondary
`Common Control Physical Channel) can be provided by a
`cell, so that a terminal desires to receive a transmission chan
`nel FACH (Forward Access Channel) or a PCH (Paging
`Channel), it first selects a mapped S-CCPCH channel. That is,
`the terminal selects a S-CCPCH channel to be received by
`itself by using the U-RNTI.
`The conventional RNTIs are used only for the point-to
`point radio service, they serve to identify only one terminal.
`Thus, when the terminal receives data through the downlink
`common transport channel, it recognizes whether the RNTI
`included in the header of the MAC PDU is the same as an
`RNTI assigned to itself and transfers only data including the
`Same RNTI.
`However, the MBMS transmitting data to a plurality of
`terminal, that is, to a terminal group, by using the point-to
`multipoint radio service on the radio, the conventional RNTI
`can not be used.
`First, when the conventional RNTI is used for the common
`transport channel for the MBMS, RNTIs of plural terminals
`for receiving a corresponding data should be all included in
`the header of the MAC PDU. Then, RNTIs as many as the
`receiving terminals are included in the header of the MAC
`PDU, the header becomes fat.
`For this reason, in case of the conventional CBS service, no
`RNTI is included in the header of the MAC PDU to provide
`the point-to-multipoint radio service. Instead, a message ID is
`included in a BMC message in an BMC layer. In this case,
`however, the MAC layer of the terminal can not recognize
`whether a received data belongs to itself, every data received
`over the common transport channel should be transmitted to
`the upper RLC and BMC layers.
`There is another disadvantage of the message identifier. In
`the conventional art, the user gives the BMC layer message
`identifier information to be received. The terminal thereby
`transfers a corresponding message to the upper layer only
`when a message identifier of the received BMC message is
`identical to a message identifier selected by the user. With this
`method, protection of information of a specific message data
`is not guaranteed. That is, because the whole message iden
`tifiers are known to the every user, it is not possible that a
`specific message data is received only by a specific user group
`or a specific message data is protected from damage or dis
`tortion.
`The above references are incorporated by reference herein
`where appropriate for appropriate teachings of additional or
`alternative details, features and/or technical background.
`
`SUMMARY OF THE INVENTION
`
`Accordingly, the present invention is directed to a universal
`mobile telecommunication system that Substantially obviates
`one or more problems due to limitations and disadvantages of
`the related art.
`An advantage of the present invention is a multimedia
`service providing method in a radio mobile telecommunica
`tion system that provides an identification code for MBMS
`service.
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`Another advantage of the present invention is a universal
`mobile telecommunication system capable of determining
`whether a data is usable or not and transmitting only the
`usable data to an upper layer of a user equipment.
`Still another advantage of the present invention is a univer
`sal mobile telecommunication system capable of assigning a
`radio resource, configuration and control information
`through an RNTI.
`Additional advantages and features of the invention will be
`set forth in part in the description which follows and in part
`will become apparent to those having ordinary skill in the art
`upon examination of the following or may be learned from
`practice of the invention. The objectives and other advantages
`of the invention may be realized and attained by the structure
`particularly pointed out in the written description and claims
`hereofas well as the appended drawings.
`To achieve at least the above objects in whole or in parts,
`there is provided a multimedia service providing methodinan
`universal mobile telecommunication system in which multi
`media broadcast/multicast service (MBMS) is provided to
`plural terminals, including: generating an identifier for a spe
`cific MBMS service; adding the generated identifier to every
`MBMS protocol data unit; and transferring the MBMS pro
`tocol data unit to a terminal.
`Preferably, the identifier is an MBMS radio network tem
`porary identifier (RNTI).
`Preferably, the identifier is generated from a radio resource
`control (RRC) layer.
`Preferably, the RRC layer generates the identifier when a
`radio access bearer is established, and discards the identifier
`when the radio access bearer is released.
`Preferably, the identifier indicates a specific MBMS ser
`Vice or a multicast group.
`Preferably, the specific MBMS service is a broadcast ser
`Vice or a multicast service.
`35
`Preferably, the identifier is included in headerofan MBMS
`protocol data unit.
`Preferably, the MBMS protocol data unit is an MAC pro
`tocol data unit and the header is a header of the MAC protocol
`data unit.
`Preferably, the MBMS protocol data unit includes an indi
`cator indicating a type of the identifier.
`To achieve at least these advantages in whole or in parts,
`there is further provided a multimedia service providing
`method in an universal mobile telecommunication system in
`which multimedia broadcast/multicast service (MBMS) is
`provided to a terminal group consisting of plural terminals,
`including: generating an identifier for an MBMS service and
`assigning it to a terminal group; adding an MBMS identifier
`in the MBMS protocol data unit and transmitting it to the
`terminal group; and comparing the MBMS identifier con
`tained in the received MBMS protocol data unit and the
`assigned MBMS identifier and receiving the MBMS protocol
`data unit by each terminal.
`Preferably, the MBMS identifier is an MBMS radio net
`work temporary identifier (RNTI).
`Preferably, the MBMS identifier is generated by an RRC
`(Radio Resource Control) layer of UTRAN.
`Preferably, the RRC layer generates the identifier when a
`radio access bearer is established, and discards the identifier
`when the radio access bearer is released.
`Preferably, the MBMS identifier is assigned by an RRC
`(Radio Resource Control) layer of UTRAN.
`Preferably, the MBMS identifier is assigned to the terminal
`group through an RRC message.
`Preferably, the MBMS identifier is included in the header
`of the MBMS protocol data unit.
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`Preferably, the MBMS protocol data unit is an MAC pro
`tocol data unit and the header is a header of the MAC protocol
`data unit.
`Preferably, the MBMS protocol data unit includes an iden
`tifier type indicator indicating a type of the identifier.
`Preferably, the identifier type indicator is included in the
`header of the MBMS protocol data unit.
`Preferably, the MBMS protocol data unit is an MAC pro
`tocol data unit and the header is a header of the MAC protocol
`data unit.
`In the multimedia service providing method in an universal
`mobile telecommunication system of the present invention,
`the MBMS data receiving step includes: checking whether
`the MBMS identifier is included in the MBMS protocol data
`unit; checking whether the MBMS identifier included in the
`MBMS protocol data unit is identical to the previously
`assigned MBMS identifier if the MBMS identifier is included
`in the MBMS protocol data unit; removing a header from the
`MBMS protocol data unit if the two identifiers are identical;
`and transferring the header-removed MBMS protocol data
`unit to an upper layer of a terminal.
`Preferably, the terminal checks whether the MBMS iden
`tifier is included in the MBMS protocol data unit by checking
`whether an identifier type indicator of the MBMS protocol
`data unit indicates the MBMS identifier.
`Preferably, the identifier type indicator indicates a type of
`the identifier included in the MBMS protocol data unit.
`Preferably, if the two identifiers are not identical, the ter
`minal discards the received MBMS protocol data unit.
`The multimedia service providing method of a universal
`mobile telecommunication system of the present invention
`further includes: constructing feedback information on the
`received MBMS data; and adding the MBMS identifier to
`feedback information of the MBMS data and transferring it to
`UTRAN by each terminal.
`To achieve at least these advantages in whole or in parts,
`there is further provided a multimedia service providing
`method in an universal mobile telecommunication system in
`which multimedia broadcast/multicast service (MBMS) is
`provided to a terminal group consisting of plural terminals,
`including: transferring plural physical channel information to
`a terminal group; assigning an MBMS identifier to terminals
`which are to receive an MBMS data; and obtaining informa
`tion of a specific physical channel indicated by the MBMS
`identifier from the plural physical channel information and
`receiving the MBMS data.
`Preferably, the MBMS identifier is an MBMS radio net
`work temporary identifier (RNTI).
`Preferably, the MBMS identifier indicates the specific
`physical channel by indicating the number of the specific
`physical channel included in the plural physical channel
`information.
`Preferably, the physical channel is a secondary common
`control physical channel transmitting MBMS data.
`Preferably, information of the physical channel is a list of
`plural channels transmitting MBMS data and a parameter
`indicating a channel code of the physical channel, a scram
`bling code, a size of a data to be transmitted, a time interval at
`which data is transmitted, a channel coding, and a type of a
`transport channel mapped with a corresponding physical
`channel and a logical channel.
`In the multimedia service providing method of a universal
`mobile telecommunication system of the present invention,
`the MBMS data receiving step includes: selecting a specific
`physical channel indicated by the MBMS identifier among
`the plural physical channels included in the plural physical
`channel information; obtaining information on the selected
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`7
`physical channel from the plural physical channel informa
`tion; establishing the selected physical channel by each ter
`minal; and receiving the MBMS data through the selected
`physical channel.
`Additional advantages, objects, and features of the inven
`tion will be set forth in part in the description which follows
`and in part will become apparent to those having ordinary
`skill in the art upon examination of the following or may be
`learned from practice of the invention. The objects and advan
`tages of the invention may be realized and attained as particu
`larly pointed out in the appended claims.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`8
`Applicants hereby incorporate by reference the publica
`tions which include the standard features that are both
`adopted and being proposed by 3GPP for all purposes as if
`fully set forth herein.
`The present invention proposes an MBMS RNTI (MBMS
`Radio Network Temporary Identifier) used when MBMS ser
`vice-related information is given and taken between UTRAN
`and a terminal or between nodes in UTRAN in case that
`UTRAN provides an MBMS service, in which the MBMS
`RNTI serves as a identifier for a specific MBMS service or a
`multicast group.
`Characteristics of the MBMS RNTI
`The MBMS RNTI is added as header