Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 2 of 22 PageID #: 111
`111111
`1111111111111111111111111111111111111111111111111111111111111
`US007881236B2
`
`c12) United States Patent
`Park et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,881,236 B2
`Feb. 1, 2011
`
`(54) DATA TRANSMISSION METHOD AND USER
`EQUIPMENT FOR THE SAME
`
`2007/0115871 A1
`
`5/2007 Zhang et al.
`
`(75)
`
`Inventors: Sung Jun Park, Anyang-Si (KR); Seung
`June Yi, Anyang-Si (KR); Young Dae
`Lee, Anyang-Si (KR); Sung Duck
`Chun, Anyang-Si (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 0 days.
`
`(21) Appl. No.: 12/538,514
`
`(22) Filed:
`
`Aug.10, 2009
`
`(65)
`
`Prior Publication Data
`
`US 2010/0035581 Al
`
`Feb. 11,2010
`
`Related U.S. Application Data
`
`(60) Provisional application No. 61/087,988, filed on Aug.
`11, 2008.
`
`(30)
`
`Foreign Application Priority Data
`
`Jun.25,2009
`
`(KR)
`
`...................... 10-2009-0057128
`
`(51)
`
`Int. Cl.
`H04L 12156
`(2006.01)
`(2006.01)
`H04J 1/16
`(52) U.S. Cl. ........................ 370/278; 370/329; 370/412
`(58) Field of Classification Search ................. 370/329,
`370/412, 278
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`7,660,279 B2 * 2/2010 Bruecket a!. ............... 370/328
`2/2007 Anderson
`2007/0042784 A1
`
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`
`2008-103862 A
`
`5/2008
`
`(Continued)
`
`OTHER PUBLICATIONS
`
`LG Electronics, "Corrections to the random access response recep(cid:173)
`tion," 3GPP TSG-RAN WG2 #62, May 5-9, 2008, p. 3, paragraph
`5.1.4.
`
`(Continued)
`
`Primary Examiner-John Pezzlo
`(74) Attorney, Agent, or Firm-Birch, Stewart, Kolasch &
`Birch, LLP
`
`(57)
`
`ABSTRACT
`
`A mobile communication technology, and, more particularly,
`a method for efficiently transmitting data stored in a message
`3 (Msg3) buffer and a user equipment for the same is dis(cid:173)
`closed. The method of transmitting data by a user equipment
`in uplink includes receiving an uplink (UP) Grant signal from
`a base station on a specific message, determining whether
`there is data stored in a message 3 (Msg3) buffer when receiv(cid:173)
`ing the UL Grant signal on the specific message, determining
`whether the specific message is a random access response
`message, and transmitting the data stored in the Msg3 buffer
`to the base station using the UL Grant signal received on the
`specific message, if there is data stored in the Msg3 buffer
`when receiving the UL Grant signal on the specific message
`and the specific message is the random access response mes(cid:173)
`sage.
`
`13 Claims, 10 Drawing Sheets
`
`SAMSUNG 1001-0001
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 3 of 22 PageID #: 112
`
`US 7,881,236 B2
`Page 2
`
`U.S. PATENT DOCUMENTS
`2010/0034162 A1 * 2/2010 Ou eta!. ..................... 370/329
`2010/0037113 A1 * 2/2010 Maheshwari eta!. ........ 714/748
`
`FOREIGN PATENT DOCUMENTS
`
`KR
`KR
`KR
`
`10-2007-0055004 A
`10-2007-0107619 A
`10-2008-0030941 A
`
`5/2007
`1112007
`4/2008
`
`wo WO 2008/023932 A1
`2/2008
`OTHER PUBLICATIONS
`3GPP TS 36.321 V8.2.0., 3m Generation Partnership Project; Tech(cid:173)
`nical Specification Group Radio Access Network; Evolved Universal
`Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC)
`protocol specification (Release 8), pp. 1-33, May 2008.
`3m Generation Partnership Project (3GPP), "Enforcing New Trans(cid:173)
`mission After Flushing HARQ Process", pp. 1-6, Feb. 9-13, 2009,
`Athens, Greece, XP050323002.
`* cited by examiner
`
`SAMSUNG 1001-0002
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 4 of 22 PageID #: 113
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 1 of 10
`
`US 7,881,236 B2
`
`FIG.l
`
`E-UMTS
`
`102
`
`Core Network
`
`105
`
`E-UTRAN
`
`101
`
`104a
`
`eNode B
`
`eNode B
`
`103
`
`SAMSUNG 1001-0003
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 5 of 22 PageID #: 114
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 2 of 10
`
`US 7,881,236 B2
`
`FIG. 2
`
`RRC
`
`RLC
`
`MAC
`
`PHY
`
`UE
`
`PDCP
`
`RLC
`
`MAC
`
`PHY
`
`UE
`
`FIG. 3
`
`RRC
`
`RLC
`
`MAC
`
`PHY
`
`E-UTRAN
`
`PDCP
`
`RLC
`
`MAC
`
`PHY
`
`E-UTRAN
`
`SAMSUNG 1001-0004
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 6 of 22 PageID #: 115
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 3 of 10
`
`US 7,881,236 B2
`
`FIG. 4
`
`UE
`
`eNB
`
`s 402"-"'
`
`RA Preamble assignment
`
`VS4 01
`~
`
`Random Access Preamble
`
`Random Access Response
`
`VS4 03
`~
`
`SAMSUNG 1001-0005
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 7 of 22 PageID #: 116
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 4 of 10
`
`US 7,881,236 B2
`
`FIG. 5
`
`UE
`
`eNB
`
`s
`SOL,,
`~ Random Access Preamble
`
`Random Access Response
`
`VSS 02
`~
`
`s 503"-
`
`~ Scheduled Transmission
`
`Contention Resolution
`
`../S5 04
`~
`
`SAMSUNG 1001-0006
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 8 of 22 PageID #: 117
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 5 of 10
`
`US 7,881,236 B2
`
`FIG. 6
`
`UE
`
`eNB
`
`..,..___ ______________________ _
`PDCCH (NDI=O) (8601)
`
`Data 1 on PUSCH(Initial transmission) (S602)
`
`NACK on PHICH(S603)
`.....-------------------------
`
`Data 1 on PUSCH{ Retransmission) (S604)
`
`~ _____ ACK _9n PHICH(SB05l _______ _
`
`..,..___ _____ PDCCH _i_NDI=ll {S606) _______ _
`
`Data 2 on PUSCH([nitial transmission) {8607)
`
`SAMSUNG 1001-0007
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 9 of 22 PageID #: 118
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 6 of 10
`
`US 7,881,236 B2
`
`FIG. 7
`lf New arrival
`
`At reception ofMsg2
`
`Generation and
`storing Msg3
`
`UE RLCor
`PDCP Buffer
`
`Msg3 Buffer
`(602)
`
`HARQ Buffer
`Corresponding
`to HARQ
`process #A
`(603)
`
`S6300~
`
`Msg3 Buffer
`(602)
`
`HARQ Buffer
`Corresponding
`to HARQ
`process #B
`(604)
`
`SAMSUNG 1001-0008
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 10 of 22 PageID #: 119
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 7 of 10
`
`US 7,881,236 B2
`
`FIG. 8
`
`2~~2~~~~!_8801)_ ...
`. "" :.~· ~-·"'"'"-"""''--"""""-_,., ...... ~_ ... __
`Random Access Response(S802)
`
`.
`
`-"~~·· . .
`
`.
`
`Msg3
`
`CR Timer
`starts ~
`
`CR 'rimer
`exp1rs ...--{
`(S804)
`
`CR Timer
`starts ~
`
`(with BSR)
`
`Du~ h) the ignorance
`of cngoing Random
`Acces£- Pt·ocedure
`
`0-~ -· . Reception
`
`Failure
`
`UL Grant on PDCCH(SB07)
`
`Stop CR Timer
`
`~ SBOB
`
`SAMSUNG 1001-0009
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 11 of 22 PageID #: 120
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 8 of 10
`
`US 7,881,236 B2
`
`FIG. 9
`
`S901
`
`Identify the HARQ process
`
`S902
`
`S903
`
`Check
`Non-Adaptive
`Retransmission
`
`NO
`
`Adaptive
`Retransmission
`
`®
`
`S905
`
`S909
`
`NO
`
`NO
`
`YES
`
`New Data Transmission
`
`Data in the Ms g3
`Buffer Transmission
`
`S90B
`
`SAMSUNG 1001-0010
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 12 of 22 PageID #: 121
`
`U.S. Patent
`
`Feb. 1, 2011
`
`Sheet 9 of 10
`
`US 7,881,236 B2
`
`FIG. 10
`
`I eNB I
`
`2. Random Access Preamble
`
`3. Random Access Response
`
`UE
`
`1. BSR
`Trigger
`
`4. Msg3
`
`_1_
`5. Msg3 transmission
`CR Timer
`starts ---vl-------_..;;:.-----------;
`
`CR Timer
`expirs
`
`6. UL Grant on PDCCH
`with the UE s C- RNTI or SPS C- RNTI
`
`7. Acquiring New MAC PDU
`from Multiplexing
`and Assembly Entity
`
`8. New MAC PDU transmission
`
`SAMSUNG 1001-0011
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 13 of 22 PageID #: 122
`
`0
`....
`0 .....
`0
`....
`.....
`=- ('D
`
`rFJ
`
`('D
`
`0"
`('D
`""f'j
`
`....
`0 ....
`. .... ~
`
`N
`
`~ = ~
`
`~
`~
`~
`•
`00
`
`e •
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`1:--t-------~
`J
`I
`
`BSR
`
`l
`
`process
`HARQ
`
`(
`1106
`
`Entity
`HARQ
`
`Data
`MAC
`
`lt
`
`~------'------
`
`1109
`
`FIG. 11
`
`11'01
`\
`Module
`
`Rx
`
`1~02
`
`1-
`
`PDSCH
`PDCCH/
`
`Module
`
`Tx
`
`~
`
`PUSCH
`
`PHY
`
`1108
`
`0'1 = N
`
`w
`'N
`""""'
`00
`Oo
`-....l
`rJl
`d
`
`1107
`
`Buffer
`HARQ
`
`copy
`
`1103
`
`)
`
`Buffer
`Msg3
`
`1105 -_j
`I
`)
`I
`
`I
`I Assembly Entity
`Multiplexing and
`I
`
`L_ -
`
`I
`
`I
`New Data
`
`l __ _j
`I
`
`UL Grant
`
`I
`
`I
`
`I
`I
`
`I
`
`UL-SCH
`
`SAMSUNG 1001-0012
`
`

`
`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 14 of 22 PageID #: 123
`
`US 7,881,236 B2
`
`1
`DATA TRANSMISSION METHOD AND USER
`EQUIPMENT FOR THE SAME
`
`CROSS REFERENCE TO RELATED
`APPLICATIONS
`
`This application claims the benefit of U.S. Provisional
`Application No. 61/087,988, filed on Aug. 11,2008, which is
`hereby incorporated by reference as if fully set forth herein.
`This application claims the benefit of Korean PatentAppli(cid:173)
`cationNo. 10-2009-0057128, filed on Jun. 25,2009, which is
`hereby incorporated by reference as if fully set forth herein.
`
`BACKGROUND OF THE INVENTION
`
`15
`
`2
`The radio interface protocols of FIGS. 2 and 3 are horizon(cid:173)
`tally formed of a physical layer, a data link layer and a net(cid:173)
`work layer. The radio interface protocols are vertically
`formed of a user plane for transmitting data information and
`5 a control plane for transmitting control signals. In detail, FIG.
`2 shows the layers of a radio protocol control plane and FIG.
`3 shows the layers of a radio protocol user plane. The protocol
`layers ofFIGS. 2 and 3 may be divided into a first layer (Ll ),
`a second layer (L2) and a third layer (L3) based on three lower
`10 layers of an OSI reference model that is widely known in the
`field of communication systems.
`Hereinafter, the layers of the control plane of the radio
`protocol of FIG. 2 and the user plane of the radio protocol of
`FIG. 3 will be described.
`A physical (PHY) layer of the first layer provides an infor-
`mation transfer service to an upper layer using a physical
`channel. The PHY layer is connected to an upper layer, such
`as a Medium Access Control (MAC) layer, via a transport
`channel. Data is transferred between the MAC layer and the
`20 PHY layer via the transport channel. At this time, the trans(cid:173)
`port channel is largely divided into a dedicated transport
`channel and a common transport channel, depending on
`whether or not a channel is shared. Data is also transferred
`between different PHY layers, such as a physical layer of a
`25 transmitting side and a physical layer of a receiving side, via
`a physical channel using radio resources.
`Various layers exist in the second layer. First, the MAC
`layer serves to map various logical channels to various trans(cid:173)
`port channels and serves to multiplex several logical channels
`into one transport channel. The MAC layer is connected to a
`Radio Link Control (RLC) layer, which is an upper layer, by
`the logical channel. The logical channel may be largely
`divided into a control channel for transmitting information
`about the control plane and a traffic channel for transmitting
`information about the user plane according to the kinds of
`information transmitted.
`The RLC layer of the second layer serves to segment and
`concatenate data received from an upper layer so as to adjust
`data size such that a lower layer transmits data in a radio
`40 section. In addition, the RLC provides three modes, namely,
`a Transparent Mode (TM), an Unacknowledged Mode (UM)
`and an Acknowledged Mode (AM) in order to guarantee
`various Quality of Services (QoSs) requested by Radio Bear-
`ers (RBs ). In particular, the AM RLC performs a retransmis(cid:173)
`sion function using an Automatic Repeat and Request (ARQ)
`function for reliable data transmission.
`A Packet Data Convergence Protocol (PDCP) layer of the
`second layer performs a header compression function to
`reduce the size of an Internet Protocol (IP) packet header that
`50 includes unnecessary control information and has a relatively
`large size, for effective transmission in a radio section having
`a relatively small bandwidth when transmitting an IP packet
`such as an IPv4 packet or an IPv6 packet. Therefore, only
`necessary information in a header portion of data is transmit(cid:173)
`ted so as to improve transmission efficiency of the radio
`section. In the LTE system, the PDCP layer also performs a
`security function, which includes ciphering for preventing
`data from being intercepted by a third party and integrity
`protection for preventing data from being handled by a third
`party.
`A Radio Resource Control (RRC) located at a highest
`portion of the third layer is defined only in the control plane.
`The RRC layer handles logical channels, transport channels
`and physical channels for the configuration, re-configuration
`and release of RBs. Here, the RBs refer to logical paths
`provided by the first and second layers of the radio protocol,
`for data transfer between the UE and the UTRAN, and the
`
`1. Field of the Invention
`The present invention relates to a mobile communication
`technology, and more particularly, to a method for efficiently
`transmitting data stored in a message 3 (Msg3) buffer and a
`user equipment for the same.
`2. Discussion of the Related Art
`As an example of a mobile communication system to
`which the present invention is applicable, a 3rd Generation
`Partnership Project Long Term Evolution (3GPP LTE) com(cid:173)
`munication system will be schematically described.
`FIG. 1 is a schematic view showing the network architec(cid:173)
`ture of an Evolved Universal Mobile Telecommunication
`System (E-UMTS) as an example of a mobile communication
`system.
`The E-UMTS is evolved from the existing UMTS and has 30
`been currently standardized in the 3GPP. Generally, the
`E-UMTS may be called an LTE system.
`An E-UMTS network may be largely divided into an
`Evolved UMTS Terrestrial Radio Access Network (E-UT(cid:173)
`RAN) 101 andaCoreNetwork(CN) 102. TheE-UTRAN101 35
`may include a User Equipment (UE) 103, a base station
`(hereinafter, referred to as an "eN ode B" or "eNB") 104, and
`an Access Gateway (AG) 105 positioned at the end of the
`network and connected to an external network. The AG 105
`may be divided into a portion for processing user traffic and a
`portion for processing control traffic. At this time, an AG for
`processing new user traffic and an AG for processing control
`traffic may communicate with each other using a new inter(cid:173)
`face.
`One or more cells may exist in one eN ode B. A plurality of 45
`eN ode Bs may be connected by an interface for transmitting
`the user traffic or control traffic. The CN 102 may include the
`AG 105 and a node for registering a user of the UE 103. An
`interface for distinguishing between the E-UTRAN 101 and
`the CN 102 may be used.
`Layers of radio interface protocol between the UE and the
`network may be classified 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) reference model that is widely
`known in the field of communication systems. A physical 55
`layer belonging to the first layer provides an information
`transfer service using a physical channel. A Radio Resource
`Control (RRC) layer belonging to the third layer serves to
`control radio resources between the UE and the network. The
`UE and the network exchange an RRC message via the RRC 60
`layer. The RRC layer may be distributed and located at net(cid:173)
`worknodes of the eN ode B 104 and theAG 105.Altematively,
`the RRC layer may be located at only the eN ode B 104 or the
`AG105.
`FIGS. 2 and 3 show the structures of radio interface proto- 65
`cols between the UE and the UTRAN based on a 3GPP radio
`access network standard.
`
`SAMSUNG 1001-0013
`
`

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`Case 1:15-cv-00546-SLR Document 1-4 Filed 06/25/15 Page 15 of 22 PageID #: 124
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`US 7,881,236 B2
`
`4
`handover procedure or when it is requested by the command
`of the base station, as described above.
`A random access procedure of a UE with a specific eN ode
`B may largely include (1) a step of, at the UE, transmitting a
`random access preamble to the eN ode B (hereinafter, referred
`to as a "message 1" transmitting step if such use will not lead
`to confusion), (2) a step of receiving a random access
`response from the eN ode Bin correspondence with the trans(cid:173)
`mitted random access preamble (hereinafter, referred to as a
`10 "message 2" receiving step if such use will not lead to con(cid:173)
`fusion), (3) a step of transmitting an uplink message using the
`information received by the random access response message
`(hereinafter, referred to as a "message 3" transmitting step if
`such use will not lead to confusion), and ( 4) a step of receiving
`15 a message corresponding to the uplink message from the
`eN ode B (hereinafter, referred to as a "message 4" receiving
`step if such use will not lead to confusion).
`In the random access procedure, the UE stores data to be
`transmitted via the message 3 in a message 3 (Msg3) buffer
`20 and transmits the data stored in the msg3 buffer in correspon(cid:173)
`dence with the reception of an Uplink (UL) Grant signal. The
`UL Grant signal indicates information about uplink radio
`resources which may be used when the UE transmits a signal
`to the eN ode B, and is received on a random access response
`25 message received on a PDCCH or a PUSCH in the LTE
`system. According to the current LTE system standard, it is
`defined that, if the UL Grant signal is received in a state in
`which data is stored in the Msg3 buffer, the data stored in the
`Msg3 buffer is transmitted regardless of the reception mode
`30 of the UL Grant signal. As described above, if the data stored
`in the Msg3 buffer is transmitted in correspondence with the
`reception of all UL Grant signals, problems may occur.
`Accordingly, there is a need for research to solve such prob(cid:173)
`lems.
`
`SUMMARY OF THE INVENTION
`
`3
`configuration of the RBs refers to a process of defining the
`characteristics of the radio protocol layer and channel neces(cid:173)
`sary for providing a specific service, and setting detailed
`parameters and operation methods. Each of the RBs is
`divided into a signaling RB and a data RB. The SRB is used
`as a path for transmitting an RRC message in the control plane
`(C-plane), and the DRB is used as a path for transmitting user
`data in the user plane (U-plane).
`Downlink transport channels for transmitting data from a
`network to a UE may include a Broadcast Channel (BCH) for
`transmitting system information and a downlink Shared
`Channel (SCH) for transmitting user traffic or a control mes(cid:173)
`sage. The traffic or the control message of a downlink multi(cid:173)
`cast or broadcast service may be transmitted via the downlink
`SCHor via a separate Downlink Multicast Channel (MCH).
`Uplink transport channels for transmitting data from a UE to
`a network may include a Random Access Channel (RACH)
`for transmitting an initial control message and an uplink SCH
`for transmitting user traffic or a control message.
`Downlink physical channels for transmitting information
`transferred via the downlink transport channels in a radio
`section between a network and a UE may include a Physical
`Broadcast Channel (PBCH) for transmitting information
`about a BCH, a Physical Multicast Channel (PMCH) for
`transmitting information about an MCH, a Physical Down(cid:173)
`link Shared Channel (PDSCH) for transmitting information
`about a PCH and a downlink SCH, and a Physical Downlink
`Control Channel (PDCCH) (also referred to as a DL Ll/L2
`control channel) for transmitting control information pro(cid:173)
`vided by the first layer and the second layer, such as downlink
`(DL) or uplink (UL) scheduling grant information. Uplink
`physical channels for transmitting information transferred via
`the uplink transport channels in a radio section between a
`network and a UE may include a Physical Uplink Shared
`Channel (PUSCH) for transmitting information about an 35
`uplink SCH, a Physical Random Access Channel (PRACH)
`for transmitting information about an RACH, and a Physical
`Uplink Control Channel (PUCCH) for transmitting control
`information provided by the first layer and the second layer,
`such as a HARQ ACK or NACK, a Scheduling Request (SR), 40
`a Channel Quality Indicator (CQI) report.
`Hereinafter, a random access procedure provided by an
`LTE system will be schematically described based on the
`above description.
`First, a UE performs the random access procedure in the
`following cases.
`when the UE performs initial access because there is no
`RRC Connection with an eN ode B,
`when the UE initially accesses a target cell in a handover
`procedure,
`when the random access procedure is requested by a com(cid:173)
`mand of an eN ode B,
`when there is uplink data transmission in a situation where
`uplink time synchronization is not aligned or where a
`specific radio resource used for requesting radio
`resources is not allocated, and
`when a recovery procedure is performed in case of radio
`link failure or handover failure.
`In the LTE system, there are provided two procedures in
`selecting a random access preamble: one is a contention
`based random access procedure in which the UE randomly
`selects one preamble within a specific group for use, and
`another is a non-contention based random access procedure
`in which the UE uses a random access preamble allocated
`only to a specific UE by the eNode B. The non-contention
`based random access procedure may be used only in the
`
`50
`
`Accordingly, the present invention is directed to a data
`transmission method and a user equipment for the same that
`substantially obviate one or more problems due to limitations
`and disadvantages of the related art.
`An object of the present invention is to provide a data
`transmission method and a user equipment for the same,
`which is capable of solving a problem which may occur when
`45 data stored in a message 3 (Msg3) buffer is transmitted
`according to a reception mode of an Uplink (UL) Grant sig(cid:173)
`nal.
`Additional advantages, objects, and features of the inven(cid:173)
`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 objectives and
`other advantages of the invention may be realized and
`attained by the structure particularly pointed out in the written
`55 description and claims hereof as well as the appended draw(cid:173)
`ings.
`To achieve these objects and other advantages and in accor(cid:173)
`dance with the purpose of the invention, as embodied and
`broadly described herein, a method of transmitting data by a
`60 user equipment through an uplink includes receiving an
`uplink grant (UL Grant) signal from a base station on a
`specific message, determining whether there is data stored in
`a message 3 (Msg3) buffer when receiving the UL Grant
`signal on the specific message, determining whether the spe-
`65 cific message is a random access response message, and
`transmitting the data stored in the Msg3 buffer to the base
`station using the UL Grant signal received on the specific
`
`SAMSUNG 1001-0014
`
`

`
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`
`US 7,881,236 B2
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`6
`When the specific HARQ process transmits the data stored
`in the Msg3 buffer through the transmission module, the data
`stored in the Msg3 buffer may be controlled to be copied into
`a specific HARQ buffer corresponding to the specific HARQ
`process, and the data copied into the specific HARQ buffer
`may be controlled to be transmitted through the transmission
`module.
`The UL Grant signal received by the reception module on
`the specific message may be a UL Grant signal received on a
`10 Physical Downlink Control Channel (PDCCH). In this case,
`the HARQ entity may control new data to be transmitted in
`correspondence with the received UL Grant signal received
`on the PDCCH.
`The UL Grant signal received by the reception module on
`15 the specific message may be a UL Grant signal received on a
`random access response message received on Physical
`Downlink Shared Channel (PDSCH), and the HARQ entity
`may control the data stored in the Msg3 buffer to be transmit(cid:173)
`ted using the UL Grant signal received on the random access
`20 response message if there is data stored in the Msg3 buffer
`when the reception module receives the UL Grant signal on
`the random access response message.
`According to the above-described embodiments of the
`present invention, it is possible to transmit data stored in a
`25 Msg3 buffer according to a reception mode of a UL Grant
`signal, without confusion.
`It is to be understood that both the foregoing general
`description and the following detailed description of the
`present invention are exemplary and explanatory and are
`30 intended to provide further explanation of the invention as
`claimed.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`5
`message, if there is data stored in the Msg3 buffer when
`receiving the UL Grant signal on the specific message and the
`specific message is the random access response message.
`If there is no data stored in the Msg3 buffer when receiving
`the UL Grant signal on the specific message or the specific
`message is not the random access response message, new data
`may be transmitted to the base station in correspondence with
`the UL Grant signal received on the specific message.
`The UL Grant signal received on the specific message may
`be a UL Grant signal received on a Physical Downlink Con(cid:173)
`trol Channel (PDCCH). In this case, the user equipment may
`transmit new data in correspondence with the UL Grant signal
`received on the PDCCH.
`The UL Grant signal received on the specific message may
`be a UL Grant signal received on a random access response
`message received on Physical Downlink Shared Channel
`(PDSCH). In this case, if there is data stored in the Msg3
`buffer when receiving the UL Grant signal on the random
`access response message, the user equipment may transmit
`the data stored in the buffer in the Msg3 buffer using the UL
`Grant signal received on the random access response mes(cid:173)
`sage.
`The data stored in the Msg3 buffer may be a Medium
`Access Control Protocol Data Unit (MAC PDU) including a
`user equipment identifier, and the data stored in the Msg3
`buffer further include information about a buffer status report
`(BSR) if the user equipment starts the random access proce(cid:173)
`dure for the BSR.
`In another aspect of the present invention, a user equipment
`includes a reception module receiving an uplink grant (UL
`Grant) signal from a base station on a specific message, a
`transmission module transmitting data to the base station
`using the UL Grant signal received on the specific message, a
`message 3 (Msg3) buffer storing UL data to be transmitted in 35
`a random access procedure, and a Hybrid Automatic Repeat
`Request (HARQ) entity determining whether there is data
`stored in the Msg3 buffer when the reception module receives
`the UL Grant signal and the specific message is a random
`access response message, acquiring the data stored in the 40
`Msg3 bufferifthereis data stored in the Msg3 buffer when the
`reception module receives the UL Grant signal and the spe(cid:173)
`cific message is the random access response message, and
`controlling the transmission module to transmit the data
`stored in the Msg3 buffer to the base station using the UL 45
`Grant signal received by the reception module on the specific
`message.
`The user equipment may further include a multiplexing
`and assembly entity used for transmission of new data. In this
`case, the HARQ entity may acquire the new data to be trans-
`mitted from the multiplexing and assembly entity if there is
`no data stored in the Msg3 buffer when the reception module
`receives the UL Grant signal on the specific message or the
`received message is not the random access response message,
`and control the transmission module to transmit the new data
`acquired from the multiplexing and assembly entity using the
`UL Grant signal received by the reception module on the
`specific message.
`The user equipment may further include one or more
`HARQ processes, and HARQ buffers respectively corre(cid:173)
`sponding to the one or more HARQ processes. In this case,
`the HARQ entity may transfer the data acquired from the
`multiplexing and assembly entity or the Msg3 buffer to a
`specific HARQ process of the one or more HARQ processes
`and control the specific HARQ process to transmit the data 65
`acquired from the multiplexing and assembly entity or the
`Msg3 buffer through the transmission module.
`
`so
`
`The accompanying drawings, which are included to pro(cid:173)
`vide a further understanding of the invention and are incor(cid:173)
`porated in and constitute a part of this application, illustrate
`embodiment(s) of the invention and together with the descrip(cid:173)
`tion serve to explain the principle of the invention. In the
`drawings:
`FIG. 1 is a schematic view showing the network architec(cid:173)
`ture of an Evolved Universal Mobile Telecommunication
`System (E-UMTS) as an example of a mobile communication
`system;
`FIGS. 2 and 3 are views showing the structures of radio
`interface protocols between a user equipment (UE) and a
`UMTS Terrestrial Radio Access Network (UTRAN) based on
`a 3rd Generation Partnership Project (3GPP) radio access
`network standard;
`FIG. 4 is a view illustrating an operating procedure of a UE
`and a base station (eN ode B) in a non -contention based ran(cid:173)
`dom access procedure;
`FIG. 5 is a view illustrating an operating procedure of a UE
`and an eN ode B in a contention based random access proce(cid:173)
`ss dure;
`FIG. 6 is a view illustrating an uplink Hybrid Automatic
`Repeat Request (HARQ) scheme;
`FIG. 7 is a view illustrating a method of transmitting a
`message 3 in a random access procedure when uplink radio
`60 resources are requested;
`FIG. 8 is a view illustrating a problem which may occur
`when data stored in a message 3 buffer is transmitted by an
`Uplink (UL) Grant signal received on a message other than a
`random access response message;
`FIG. 9 is a flowchart illustrating a method of transmitting
`uplink data by a UE according to a preferred embodiment of
`the present invention;
`
`SAMSUNG 1001-0015
`
`

`
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`7
`FIG. 10 is a view illustrating a method of transmitting
`uplink data when a Buffer status Report (BSR) is triggered in
`a UE, according to an embodiment of the present invention;
`and
`FIG. 11 is a schematic view showing the configuration of a
`UE according to an embodiment of the present invention.
`
`DETAILED DESCRIPTION OF THE INVENTION
`
`45
`
`8
`(3) Message 2 Transmission
`The UE attempts to receive a random access response
`within a random access response reception window indicated
`by the eNode B through a handover command or system
`information after transmitting the random access preamble in
`step S402 (S403). More specifically, the random access
`response information may be transmitted in the form of a
`MediumAccess Control (MAC) Packet Data Unit (PDU), and
`the MAC PDU may be transferred via a Physical Downlink
`10 Shared Channel (PDSCH). In addition, the UE preferably
`monitors the PDCCH in order to enable to the UE to properly
`receive the information transferred via the PDSCH. That is,
`the PDCCH may preferably include information about a UE
`that should receive the PDSCH, frequency and time informa-
`15 tion of radio resources of the PDSCH, a transfer format of the
`PDSCH, and the like. Here, if the PDCCH has been success(cid:173)
`fully received, the UE may appropriately receive the random
`access response transmitted on the PDSCH according to
`information of the PDCCH. The random access response may
`20 include a random access preamble identifier (e.g. Random
`Access-Radio Network Temporary Identifier (RA-RNTI)),
`an UL Grant indicating uplink radio resources, a temporary
`C-RNTI, a Time Advance Command (TAC), and the like.
`As described above, the reason why the random access
`response includes the random access preamble identifier is
`because a single random access response may include ran(cid:173)
`dom access response information of at least one UE and thus
`it is reported to which UE the UL Grant, the Temporary
`C-RNTI and the TAC are valid. In this step, it is assumed that
`30 the UE selects a random access preamble identifier matched
`to the random access preamble selected by the UE in step
`S402.
`In the non-contention based random access procedure, it is
`determined that the random access procedure is normally
`performed, by receiving the random access response infor(cid:173)
`mation, and the random access procedure may be finished.
`FIG. 5 is a view illustrating an operating procedure