(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2003/0185159 A1
`(43) Pub. Date:
`Oct. 2, 2003
`Seo et al.
`
`US 2003.0185159A1
`
`(54) APPARATUS AND METHOD FOR
`DETERMINING PLOT SIGNAL FIELD
`POSITION INFORMATION FOR UPLINK
`POWER CONTROL IN AN HSDPA MOBILE
`COMMUNICATION SYSTEM
`(75) Inventors: Myeong-Sook Seo, Suwon-shi (KR);
`Sung-Ho Choi, Songnam-shi (KR);
`Ju-Ho Lee, Suwon-shi (KR); Yong-Jun
`Kwak, Yongin-shi (KR)
`Correspondence Address:
`Paul J. Farrell, Esq.
`DILWORTH & BARRESE, LLP
`333 Earle Ovington Blvd.
`Uniondale, NY 11553 (US)
`(73) Assignee: SAMSUNG ELECTRONICS CO.,
`LTD., Kyungki-Do (KR)
`10/395,619
`Mar. 24, 2003
`Foreign Application Priority Data
`
`(21) Appl. No.:
`(22) Filed:
`(30)
`
`Mar. 23, 2002 (KR)....................................... 15918/2002
`
`Publication Classification
`
`(51) Int. Cl." ..................................................... H04B 7/005
`(52) U.S. Cl. ............................................ 370/278; 370/345
`(57)
`ABSTRACT
`A mobile communication System transmits a control channel
`having an ACK/NACK information field indicating whether
`packet data is received at the Node B from the particular UE
`when the particular UE moves from the Node B to the
`handover region shared by the Node B and the neighbor
`Node B during reception of high Speed packet data from the
`Node B, a channel quality information (CQI) field indicating
`a condition of a channel over which the high Speed packet
`data is transmitted, and a pilot Signal field for power control.
`A radio network controller (RNC), connected to the Node
`and the neighbor Node B, identifies a plurality of UES
`including the particular UE and other UEs, all of which are
`located in the handover region and receive the high Speed
`packet data, and transmits pilot Signal field position infor
`mation to the UEs so that pilot signal fields that must be
`transmitted by the particular UE and the other UEs should
`not overlap with one another in the COI field. The particular
`UE includes a pilot Signal in a control channel at a position
`based on its own pilot signal field position information, and
`transmits the control channel.
`
`HS-DPCCH
`for UE #1
`
`ACKNACK or DX
`
`HS-Pilot
`(5 bits)
`
`CQ) or DTX
`
`1 slot
`HS-Piot OFFSET=0
`
`2 Soft
`
`
`
`HS-DPCCH
`for UE 2
`
`HS-DPCCH
`for UEF3
`
`HS-DPCCH
`for UEFA
`
`HS-Pilot OFFSET=15 bits
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 1 of 16
`
`US 2003/0185159 A1
`
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`Patent Application Publication
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`Oct. 2, 2003. Sheet 2 of 16
`
`US 2003/0185159 A1
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`Patent Application Publication
`
`Oct. 2, 2003. Sheet 3 of 16
`
`US 2003/0185159 A1
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`Patent Application Publication
`
`Oct. 2, 2003 Sheet 4 of 16
`
`US 2003/0185159 A1
`
`
`
`Cell it (Primary)
`ULDPDCH+ULDPCCH
`+HSDPCCH
`ULDPDCH+
`ULDPCCH
`
`
`
`DLDPCH
`t-HSwSCCH
`+HS-POSCH
`
`OLDPCH
`
`4.
`
`FIG.4
`(PRIOR ART)
`
`

`

`Patent Application Publication
`
`US 2003/0185159 A1
`
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`Patent Application Publication
`
`Oct. 2, 2003. Sheet 6 of 16
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`US 2003/0185159 A1
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`Patent Application Publication
`
`Oct. 2, 2003 Sheet 7 of 16
`
`US 2003/0185159 A1
`
`RNC (701)
`
`Node B (702)
`
`RADIO LINK RECONFIGURATION PREPARE (703)
`
`RADIO LINK RECONFIGURATION READY (704)
`
`RADIO LINK RECONFIGURATION COMMIT (705)
`
`FIG.7
`
`RNC (601)
`
`
`
`UE (802)
`
`ACTIVE SETUPDATE (803)
`
`ACTIVE SET UPDATE COMPLETE (804)
`
`FIG.8
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 8 of 16
`
`US 2003/0185159 A1
`
`90
`
`PERFORMNORMAL POWER CONTROL
`USING ONLY DPCCH PILOT
`
`MEASURESIGNAL STRENGTH OF Node B
`THROUGH CPICH MEASUREMENT
`
`
`
`904
`
`HANDOVEF REGION?
`
`YES
`
`TRANSMIT MEASUREMENT REPORT TO SRNC
`
`905
`
`RECEIVE ACTIVE SETUPDATE MESSAGE WITH
`HS-Pilot OFFSET PARAMETER FROM SRNC
`
`906
`
`TRANSMIT ACTIVE SETUPDATE
`COMPLETE MESSAGE TO SRNC
`
`
`
`907
`
`TRANSMITHS-DPCCHAT ACTIVATION TIME
`AFTER CONTROLLINGHS-Pilot OFFSET
`
`908
`
`SEPARATELY CONTROL TRANSMISSION POWER
`OF DPCH AND HS-DPCCHBY ANALYZING TPC 909
`AND HSTPC TRANSMITTED OVER OLDPCH
`
`FIG.9
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 9 of 16
`
`US 2003/0185159 A1
`
`START
`
`100
`
`RECEIVE MEASUREMENT REPORT FROM UE
`
`002
`
`DETERMINEHS-Pilot OFFSET
`NHS.-DPCCH FOR UE
`
`TRANSMIT RADIO LINK RECONFIGURATION
`PREPARE MESSAGE WITH DETERMINED
`HS-Pilot OFFSET PARAMETERTONode B
`
`1003
`
`1004
`
`RECEIVE RADIO LINK RECONFIGURATION
`READY MESSAGE FROM Node B
`
`1005
`
`TRANSMITRADIOLINK RECONFIGURATION COMMIT
`MESSAGE WITH ACTIVATION TIME TO NOde B
`
`1006
`
`TRANSMIT ACTIVE SETUPDATE MESSAGE
`WITH HS-Plot OFFSET PARAMETER TO UE
`
`1007
`
`RECEIVE ACTIVE SETUPDATE
`COMPLETE MESSAGE FROM UE
`
`-1008
`
`END
`
`1009
`
`FIG.10
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 10 of 16 US 2003/0185159 A1
`
`START
`
`O
`
`RECEIVE RADIO LINK RECONFIGURATION PREPARE
`MESSAGE WITH DETERMINED HS-Pilot
`OFFSET PARAMETER FROMSRNC
`
`TRANSMIT RADIOLINK RECONFIGURATION READY
`MESSAGE TO SRNC AFTERSUCCESSFUL
`CHANNEL RESOURCE RECONFIGURATION
`
`sayingJ
`
`RECEIVE RADIO LINK RECONFIGURATION COMMIT
`MESSAGE WITH ACTIVATIONTIME FROMSRNC
`
`02
`
`103
`
`104
`
`RECEIVE HS-DPCCH
`FROM UEAT ACTIVATION TIME
`
`GENERATE HS-TPC BY
`EXTRACTING HS-POt
`
`1105
`
`106
`
`TDM-MULTIPLEXTPC AND HS-TPC FROMDPCCH
`AND TRANSMIT RESULT OVER DLDPCH
`
`1107
`
`FIG.11
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 11 of 16 US 2003/0185159 A1
`
`201
`
`
`
`PERFORMNORMAL POWER CONTROL
`USING ONLY DPCCH PILOT
`
`MEASURE SIGNAL STRENGTH OF NOde B
`THROUGHCPICH MEASUREMENT
`
`1204
`
`
`
`YES
`
`TRANSMIT MEASUREMENT REPORT TO SRNC
`
`1205
`
`
`
`RECEIVE ACTIVE SETUPDATE MESSAGE WITH
`HS-Plot OFFSET PARAMETER FROM SRNC
`
`206
`
`TRANSMIT ACTIVE SETUPDATE
`COMPLETE MESSAGE TO SRNC
`
`
`
`12O7
`
`TRANSMITHS-DPCCHAT ACTIVATION TIME
`AFTER CONTROLLING HS-Pilot OFFSET
`
`1208
`
`
`
`
`
`
`
`
`
`
`
`
`
`SEPARATELY CONTROL TRANSMISSION POWER
`OF DPCH AND HS-DPCCHBY ANALYZING TPC
`AND HSTPC TRANSMITTED OVER DLDPCH
`FIG.12
`
`1209
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 12 of 16 US 2003/0185159 A1
`
`RECEIVE MEASUREMENTREPORT FROM UE
`
`302
`
`INFORMNOde BWHETHER UE SOCATED IN SOFT
`HANDOVER REGIONBY TRANSMITTINGRADIO
`NK RECONFIGURATION PREPAREMESSAGE
`
`.303
`
`RECEIVE RADIO LINK RECONFIGURATION
`REAOYMESSAGE FROM Node 8
`
`1304
`
`TRANSMIT RADIO LINK RECONFIGURATION COMMIT
`MESSAGE WITH ACTIVATION TIME TO Node B
`
`1305
`
`306
`
`307
`
`TRANSMIT ACTIVE SET UPDATE MESSAGE
`WITH HS-Plot OFFSET PARAMETER TO UE
`
`RECEIVE ACTIVE SETUPDATE
`COMPLETE MESSAGE FROM UE
`
`ENO
`
`1308
`
`FIG.13
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 13 of 16 US 2003/0185159 A1
`
`RECEIVERADIOLINK RECONFIGURATION
`PREPARE MESSAGE FROM SRNC
`
`402
`
`DETERMINE HS-Pilot OFFSET FOR UE
`
`1403
`
`TRANSMIT RADiO LINK RECONFIGURATION READY MESSAGE
`WITH HS-Pilot OFFSET TOSRNCAFTERSUCCESSFUL
`CHANNEL RESOURCE RECONFIGURATION
`
`1404
`
`RECEIVE RADIO LINK RECONFIGURATION COMMIT
`MESSAGE WITH ACTIVATION TIME FROM SRNC
`
`1405
`
`RECEIVE HS-DPCCH
`FROM UE AT ACTIVATION TIME
`
`GENERATE HS-TPC
`BY EXTRACTING HS-Pilot
`
`TDM-MULTIPLEXTPC AND HS-TPC FROM DPCCH
`ANDTRANSMIT RESULT OVER DLDPCH
`
`1406
`
`407
`
`1408
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 14 0f 16
`
`US 2003/0185159 A1
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`Patent Application Publication
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`Oct. 2, 2003 Sheet 15 of 16
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`US 2003/0185159 A1
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`Patent Application Publication
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`Oct. 2, 2003 Sheet 16 0f 16
`
`US 2003/0185159 A1
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`

`US 2003/0185159 A1
`
`Oct. 2, 2003
`
`APPARATUS AND METHOD FOR DETERMINING
`PILOT SIGNAL FIELD POSITION INFORMATION
`FOR UPLINK POWER CONTROL IN AN HSDPA
`MOBILE COMMUNICATION SYSTEM
`
`PRIORITY
`0001. This application claims priority under 35 U.S.C. S
`119 to an application entitled “Apparatus and Method for
`Determining Pilot Signal Field Position Information for
`Uplink Power Control in an HSDPAMobile Communication
`System filed in the Korean Industrial Property Office on
`Mar. 23, 2002 and assigned Serial No. 2002-15918, the
`contents of which are incorporated herein by reference.
`
`BACKGROUND OF THE INVENTION
`0002) 1. Field of the Invention
`0003. The present invention relates generally to an uplink
`transmission power control apparatus and method in a code
`division multiple access (CDMA) mobile communication
`System, and in particular, to an apparatus and method for
`providing a user element (UE) with position information of
`a pilot Signal field on an uplink control channel for high
`speed downlink packet access (HSDPA).
`0004 2. Description of the Related Art
`0005 Mobile communication systems have developed
`from an early mobile communication System that chiefly
`provides a voice Service into an advanced mobile commu
`nication System that Supports high-Speed, high-quality radio
`data packet communication for providing a data Service and
`a multimedia Service. Standardization for a high-speed,
`high-quality radio data packet Service has been conducted on
`a 3" generation mobile communication system divided into
`a synchronous system, also known as a 3GPP (3" Genera
`tion Partnership Project) System, and an asynchronous Sys
`tem, also known as a 3GPP2 (3" Generation Partnership
`Project 2) system. Actually, 3GPP has being carrying out
`Standardization on high Speed downlink packet acceSS
`(HSDPA), while 3GPP2 has been conducting standardiza
`tion on 1xEV-DV (Evolution Data and Voice). Such stan
`dardization has been actively conducted to find a Solution for
`a high-Speed, high-quality radio data packet Service of over
`2 Mbps in a 3" generation mobile communication system.
`Further, a 4" generation mobile communication system is
`also discussed to provide a high-speed, high-quality multi
`media Service of a much higher data rate.
`0006 Generally, HSDPA refers to a technique for trans
`mitting control information and packet data over a high
`speed dedicated shared channel (HS-DSCH), a downlink
`channel for Supporting high-Speed packet data transmission,
`in an asynchronous UMTS (Universal Mobile Telecommu
`nications System) mobile communication System. In
`HSDPA, an advanced technique for increasing adaptability
`to the variation in channel environments is required in
`addition to the general techniqueS provided in the existing
`mobile communication system. For HSDPA, adaptive
`modulation and coding (AMC), hybrid automatic retrans
`mission request (HARQ), and fast cell select (FCS) have
`been proposed to Support high-Speed packet transmission.
`0007) AMC refers to a data transmission technique for
`adaptively determining a modulation Scheme and a coding
`Scheme according to a channel condition between a particu
`
`lar Node B and a user element (UE), thereby improving
`overall utilization efficiency of the Node B. Therefore, in
`order to Support AMC, a plurality of modulation Schemes
`and coding Schemes are required, and a data channel Signal
`is modulated and coded by a combination of the modulation
`Schemes and coding Schemes. Each combination of the
`modulation Schemes and the coding Schemes is referred to as
`“modulation and coding scheme (MCS)”, and a plurality of
`MCSS of a level #1 to a level in can be defined according
`to the type of the MCS. That is, AMC is a technique for
`improving overall system efficiency of a Node B by adap
`tively determining an MCS level according to a channel
`condition with the Node B currently wirelessly connected to
`the UE.
`0008. Now, n-channel stop and wait hybrid automatic
`retransmission request (n-channel SAW HARQ), typically
`HARO, will be described. For HARO, the following two
`proposals have been provided in order to increase transmis
`Sion efficiency of automatic retransmission request (ARQ).
`AS a first proposal, HARO exchanges retransmission
`requests and responses between a UE and a Node B. AS a
`Second proposal, HARQ temporarily Stores defective data
`and then combines the defective data with its retransmitted
`data. Further, in order to make up for the defects of con
`ventional Stop and wait automatic retransmission request
`(SAW ARQ), HSDPA has introduced n-channel SAW
`HARO. In SAW ARQ, next packet data is not transmitted
`until an acknowledgement signal (ACK) for previous packet
`data is received. Therefore, in Some cases, a UE or a Node
`B must wait for ACK even though it can currently transmit
`packet data. However, in n-channel SAW HARO, a UE or a
`Node B can continuously transmit packet data even before
`the ACK for previous packet data is received, thereby
`increasing channel efficiency. That is, in logical channels are
`set up between a UE and a Node B. Then, if logical channels
`can be identified by time or a channel number, a UE
`receiving packet data can determine a channel over which
`the packet data is received. In addition, the UE can recon
`figure the packet data in the right order or Soft-combine the
`corresponding packet data.
`0009. In FCS, if a UE Supporting HSDPA is located in a
`cell Overlapping region, or a handover region, a cell having
`the best channel condition is Selected from a plurality of
`cells. Specifically, if a UE Supporting HSDPA enters a cell
`overlapping region between a current Node B and a new
`Node B, the UE sets up radio links to a plurality of cells, or
`Node Bs. A set of the cells to which the UE sets up radio
`links is referred to as “active set. The UE receives HSDPA
`packet data only from a cell having the best channel con
`dition among the cells included in the active Set, thereby
`reducing overall interference. Herein, the cell having the
`best channel condition will be referred to as “best cell.” For
`this, the UE must periodically monitor channel conditions of
`the cells included in the active Set, thereby to determine
`whether there is any cell having a better channel condition
`than the current best cell. If there is any cell having a better
`channel condition, the UE transmits a best cell indicator to
`the cells belonging to the active Set. The best cell indicator,
`an indicator for requesting change from the current best cell
`to a new best cell, includes an identifier of the new best cell.
`Each cell in the active Set receives the best cell indicator and
`analyzes a cell identifier included in the received best cell
`indicator. That is, each cell in the active Set determines
`whether a cell identifier included in the best cell indicator is
`
`

`

`US 2003/0185159 A1
`
`Oct. 2, 2003
`
`identical to its own cell identifier. If the cell identifiers are
`identical to each other, the corresponding cell Selected as a
`new best cell transmits packet data to the UE over HS
`DSCH.
`FIG. 1 schematically illustrates a downlink chan
`0.010
`nel Structure of a conventional mobile communication SyS
`tem supporting HSDPA (hereinafter referred to as an
`“HSDPA mobile communication system”) and the timing
`relationship between channels. Referring to FIG. 1, a down
`link dedicated physical channel (hereinafter referred to as
`“DL DPCH) is comprised of fields defined in Release-99,
`the standard for an existing CDMA mobile communication
`system. FIG. 2 illustrates a detailed structure of one par
`ticular slot among three slots constituting the DL DPCH,
`wherein downlink control information and data are trans
`mitted over the slot. Describing the fields illustrated in FIG.
`2, Data1 and Data2 fields transmit data for Supporting
`operation of an upper layer or data for Supporting a dedi
`cated service such as a voice service. A TPC (Transmit
`Power Control command) field transmits a downlink trans
`mission power control command for controlling transmis
`sion power of a UE. ATFCI (Transmitted Format Combi
`nation Indicator) field transmits a data rate of the Data1 and
`Data2 fields, a channel configuration type, and information
`necessary for channel demodulation. A Pilot field, contain
`ing a predetermined Symbol Stream, is used by a UE to
`estimate a State of a downlink channel.
`0011. In FIG. 1, a high speed physical downlink shared
`channel (hereinafter referred to as “HS-PDSCH) is used to
`transmit HSDPA packet data from a Node B to a UE. The
`Node B assigns an Orthogonal variable spreading factor
`(OVSF) code having a considerably low spreading factor
`(SF) to the HS-PDSCH over which high-speed packet data
`must be transmitted. For example, an SF=16 OVSF code can
`be assigned to the HS-PDSCH.
`0012 Information for controlling the HS-PDSCH is
`transmitted over a high speed shared control channel (here
`inafter referred to as “HS-SCCH). HS-PDSCH control
`information transmitted over the HS-SCCH includes:
`0013 (1) Transport format and resource related
`information (hereinafter referred to as “TFRI'''): this
`represents an MCS level to be used in HS-PDSCH,
`channelization code information of HS-PDSCH, a
`Size of a transport block, and an identifier of a
`transport channel.
`0014) (2) HARQ information:
`0015) (a) HARQ process number: in n-channel
`SAW HARO, this indicates a particular channel
`for transmitting packet data among in logical chan
`nels for HARO.
`0016 (b) Repetition version: each time a Node B
`transmits HSDPA packet data to a UE, the Node B
`transmits a selected part of the HSDPA packet
`data. Therefore, the UE must know a repetition
`Version in order to determine which part was
`transmitted.
`0017 (c) New-data indicator: this indicates
`whether HSDPA packet data transmitted from a
`Node B to a UE is new packet data or retransmit
`ted packet data.
`
`0018) As stated above, the HS-SCCH can be divided into
`a TFRI part and an HARQ information part. The TFRI
`information is information needed to despread the HS
`PDSCH over which HSDPA packet data is transmitted. That
`is, a UE, if it does not have the TFRI information, cannot
`despread the HS-PDSCH. Therefore, the TFRI information
`is transmitted at the head of the HS-SCCH, and the HARO
`information is transmitted at the end of the HS-SCCH.
`0019. The HS-SCCH can be assigned at least one chan
`nelization code. In FIG. 1, the number of HS-SCCHS that
`can be assigned to each UE is, for example, 4. Therefore, a
`Node B must inform a particular UE which of the 4
`HS-SCCHs is assigned thereto. For this, the Node B
`scrambles the TFRI information part, a first part of the
`HS-SCCH, with a UE identifier (ID). The UE ID is an
`identifier uniquely assigned to each UE by the Node B for
`identification of the UE. The UE then descrambles TFRI
`information parts of received HS-SCCHs with its own
`unique UE ID, thereby determining an HS-SCCH assigned
`thereto.
`0020 Next, a process of receiving by the UE an HSDPA
`service using the above-stated three channels of DL DPCH,
`HS-SCCH, and HS-PDSCH will be described herein below.
`0021. As illustrated in FIG. 1, DL, DPCH and HS
`SCCHs are almost simultaneously transmitted to a UE.
`Therefore, the UE will despread all of the 4 HS-SCCHs until
`it determines an HS-SCCH assigned thereto. That is, the UE
`descrambles a TFRI part of each HS-SCCH with its own
`unique UE ID, thereby determining an HS-SCCH assigned
`thereto. If a particular HS-SCCH is an HS-SCCH assigned
`thereto, the UE decodes the corresponding HS-SCCH. How
`ever, if a particular HS-SCCH is not an HS-SCCH assigned
`thereto, the UE discards values acquired by despreading the
`corresponding HS-SCCH. After extracting the TFRI infor
`mation by decoding the HS-SCCH, the UE receives HS
`PDSCH and then despreads the received HS-PDSCH. In
`FIG. 1, the reason that a start point of a transmission time
`interval (hereinafter referred to as “TTI”) of HS-PDSCH
`falls two slots behind a start point of TTI of HS-SCCH is to
`enable the UE to first extract the TFRI information from the
`HS-SCCH. Finally, the UE demodulates and decodes a
`signal transmitted over the corresponding HS-PDSCH based
`on control information detected from the HS-SCCH, thereby
`detecting HSDPA packet data.
`0022. A method for forming an uplink control channel
`supporting HSDPA will also be proposed. There is a method
`of modifying an existing uplink dedicated physical control
`channel (ULDPCCH) that does not support HSDPA, in
`order to support HSDPA. However, the existing UL D
`PCCH, when modified, may have an incompatibility prob
`lem with the existing System and may become very com
`plicated in Structure. For these reasons, there has been
`proposed another method of newly defining an uplink con
`trol channel for supporting HSDPA with a new channeliza
`tion code. Such a method is available because uplink chan
`nelization code resources are, So Sufficient that every UE can
`be assigned OVSF codes.
`0023 FIG. 3 illustrates a method of newly defining an
`uplink control channel for Supporting HSDPA with a new
`channelization code. The method of FIG.3 assigns separate
`channelization codes to an uplink dedicated physical data
`channel (hereinafter referred to as “UL, DPDCH') and an
`
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`

`US 2003/0185159 A1
`
`Oct. 2, 2003
`
`uplink dedicated physical control channel (hereinafter
`referred to as “UL, DPCCH'), both supporting Release-99,
`and a high Speed uplink dedicated physical control channel
`(hereinafter referred to as “HS-DPCCH') for supporting
`HSDPA
`0024.
`Referring to FIG. 3, each of slots constituting one
`frame of the UL DPDCH for supporting Release-99 trans
`mits upper layer data from a UE to a Node B. Each of slots
`constituting one frame of the ULDPCCH is comprised of
`a Pilot signal field, a TFCI bit field, a feedback information
`(hereinafter referred to as “FBI”) field, and a TPC field. The
`Pilot Signal field is used as a channel estimation signal when
`demodulating data transmitted from a UE to a Node B. The
`TFCI bit field indicates a transmitted format combination of
`the channels transmitted for a current transmission frame.
`The FBI field transmits feedback information when a trans
`mission diversity technique is used. The TPC field is used
`for controlling transmission power of a downlink channel.
`The ULDPCCH is spread with an OVSF code before being
`transmitted, and a spreading factor (SF) used for the OVSF
`code is fixed to 256.
`0025. In HSDPA, a UE determines whether data trans
`mitted from a Node B is defective, and then transmits an
`acknowledgement signal (hereinafter referred to as "ACK')
`or a negative acknowledgement signal (hereinafter referred
`to as “NACK") as its result over the HS-DPCCH. Also, in
`order to Support AMC, a UE can transmit channel quality
`report information to a Node B. The channel quality report
`information is called a channel quality indicator (hereinafter
`referred to as “COI). In FIG. 3, the HS-DPCCH also
`transmits a Pilot signal field (HS-Pilot) for HSDPA in
`addition to the ACK/NACK and the COI information.
`0.026
`FIG. 4 illustrates transmission of downlink control
`information and downlink data, and transmission of uplink
`control information and uplink data for HSDPA. It is
`assumed herein that a UE is located in a cell (hereinafter
`referred to as “Node B”) overlapping region, and the number
`of Node Bs is limited to 2, for the convenience of explana
`tion. In FIG. 4, a Node Bit 1401 transmits HS-PDSCH to a
`UE411, and a Node Bi?2403 transmits DL DPCH to the UE
`411 and receives UL DPCCH from the UE 411.
`0027. In transmitting and receiving the channels
`described in conjunction with FIGS. 1 and 3, a general
`power control method used in the existing Release-99
`UMTS mobile communication system cannot be used as a
`power control method in the cell overlapping region. A
`common power control method in the cell overlapping
`region will be described with reference to FIG. 4.
`0028 Referring to FIG. 4, the Node Bit 1401 and the
`Node B+2403 receive UL DPDCH and ULDPCCH trans
`mitted from the UE 411, and report the receipt to a radio
`network controller (hereinafter referred to as “RNC) con
`nected thereto. This is because the RNC analyzes a power
`control command through the UL DPDCH and the UL D
`PCCH transmitted from the UE 411. If a strength of a signal
`received from a particular Node B out of the Node Bit 1401
`and the Node Bi?2403 exceeds a threshold value, the RNC
`transmits a power-down command for decreasing uplink
`transmission power of the UE 411 to the corresponding
`Node B whose signal strength exceeds the threshold value.
`This is to suppress interference within the Node B due to
`excessive transmission power of the UE 411. Therefore, the
`
`UE 411 simultaneously receives DL DPCHS transmitted
`from the Node Bit 1401 and the Node Bi2403. As described
`above, for power control between a particular Node B
`supporting HSDPA and the UE 411, HS-PDSCH,
`HS-SCCH, and DL DPCH are transmitted in a downlink
`direction, and HS-DPCCH, UL DPDCH, and ULDPCCH
`are transmitted in an uplink direction.
`0029) UL, DPDCH and ULDPCCH transmitted from
`the UE 411 to the Node Bit 1401 and the Node Bi2403 are
`analyzed by the RNC. If the UE 411 currently located in the
`cell overlapping region communicates with any one of the
`Node Bs, the UE411 generally transmits the uplink channels
`at transmission power lower than normal uplink transmis
`sion power. However, HS-DPCCH is information necessary
`only for the Node Bit 1401 that transmits HSDPA packet
`data, and is not received at the Node Bi2403. Therefore, if
`the HS-DPCCH is transmitted to the Node Bit 1401 at the
`transmission power applied to the UL DPDCH and the
`UL, DPCCH, the Node Bit 1401 may fail to correctly ana
`lyze HS-DPCCH which is needed to transmit HSDPA packet
`data. That is, if the HS-DPCCH information is not correctly
`transmitted to the Node Bit 1401, an operation of determin
`ing an HARO type and an MCS level or selecting the best
`cell in FCS cannot be correctly achieved, causing a mal
`function of HSDPA.
`0030) Therefore, when the UE 411 receiving HSDPA
`packet data is located in the Soft handover region, transmis
`sion power of UL, DPDCH, UL DPCCH, and HS-DPCCH
`is separately controlled. For that purpose, the UE 411
`transmits an additional HS-Pilot Over HS-DPCCH of FIG.
`3 so that the Node B should generate a high speed trans
`mission power control (HS-TPC) command for only the
`HS-DPCCH. Describing the separate power control, the
`Node Bit 1401 generates a TPC command from the Pilot on
`the DPCCH and an HS-TPC command from the HS-Pilot on
`the HS-DPCCH every slot. Meanwhile, the Node Bi2403,
`since it does not provide an HSDPA service, generates only
`an existing TPC command from the Pilot on the DPCCH.
`The Node Bit 1401 then transmits the generated TPC and
`HS-TPC commands over a TPC field on the DL DPCH of
`FIG. 2 to the UE 411 by time division multiplexing. For
`example, of the three slots, two slots are used to transmit the
`existing TPC command and the other one slot is used to
`transmit the HS-TPC command. As a result, the UE 411 can
`perform power control on HS-DPCCH based on an HS-TPC
`command transmitted once every 3 slots from the Node
`Bit 1401, and at the same time, perform power control on
`UL, DPDCH and ULDPCCH based on a TPC command
`transmitted from the Node Bi2403.
`0031. In FIG.3, the ACK/NACK is transmitted over one
`slot of 3-slot HSDPA TTI of HS-DPCCH, and N-bit HS
`Pilot and COI information are transmitted over the other two
`slots. When transmission of the ACK/NACK or the COI
`information is not required, the UE 411 subjects the ACK/
`NACK or CQI field to discontinuous transmission (DTX).
`The HS-Pilot, as described in conjunction with FIG. 4, is
`intended to improve reliability of HS-DPCCH when the UE
`411 is located in a Soft handover region. Therefore, although
`the HS-Pilot can be transmitted every TTI regardless of a
`situation of a UE, the HS-Pilot can be optionally transmitted
`only when the UE 411 is located in the soft handover region.
`0032). In FIG. 3, a TTI start point of HS-DPCCH is
`different from slot start points of DPDCH and DPCCH for
`
`

`

`US 2003/0185159 A1
`
`Oct. 2, 2003
`
`the following reasons. That is, in the current HSDPA system,
`a start point of the HS-DPCCH is determined based on a
`point where a UE receives HS-PDSCH of FIG. 1, whereas
`start points of the DPDCH and the DPCCH are determined
`based on a reception point of DL DPCH. A slot start point
`of the DL DPCH is differently set according to a UE.
`Therefore, slot start points of the DPDCH and the DPCCH
`are also differently Set according to a UE. However, Since the
`HS-PDSCH is shared by all UEs, a TTI start point of the
`HS-DPCCH will be the same for all UES.
`0.033
`Because all UEs within Node BS providing an
`HSDPA service transmit all of ACK/NACK, HS-Pilot, and
`CQI information on the HS-DPCCH at the same time, uplink
`interference among the UES may be increased. Herein, Since
`the ACK/NACK and the COI information are transmitted to
`each UE only when necessary, interference among the UES
`may not be considerable. However, since the HS-Pilot must
`be transmitted by all UEs when the UEs are located in the
`Soft handover region, interference among the UES may be
`considerably increased due to coincidence of transmission
`points of the HS-Pilot. In this case, due to interference
`among HS-Pilots of UEs, a Node B may fail to correctly
`perform channel estimation. That is, even though a channel
`condition between a Node B and a particular UE is good, the
`Node B may generate an incorrect HS-TPC command,
`mistakenly determining that the channel condition is poor.
`
`SUMMARY OF THE INVENTION
`It is, therefore, an object of the present invention to
`0034.
`provide an apparatus and method for determining pilot
`Signal field position information for uplink power control in
`a mobile communication System Supporting high Speed
`downlink packet access.
`0035) It is another object of the present invention to
`provide an apparatus and method for determining by a Node
`B pilot Signal field position information for user elements
`(UES) when separately performing power control on uplink
`control channels in a mobile communication System Sup
`porting high Speed downlink packet access.
`0036. It is further another object of the present invention
`to provide an apparatus and method for determining by a
`radio network controller (RNC) pilot signal field position
`information for UES when Separately performing power
`control on uplink control channels in a mobile communica
`tion System Supporting high Speed downlink packet access.
`0037. It is yet another object of the present invention to
`provide a UE transmission apparatus for including a pilot
`Signal in a control channel according to pilot Signal field
`position information by each UE located in a soft handover
`region and then transmitting the control channel in a mobile
`communication System Supporting high Speed downlink
`packet access.
`0.038. It is still another object of the present invention to
`provide a UE reception apparatus for receiving a control
`channel from each UE located in a Soft handover region and
`then receiving a pilot Signal according to pilot signal field
`position information included in the control channel in a
`mobile communication System Supporting high Speed down
`link packet access.
`0039. In accordance with a first aspect of the present
`invention, the present invention provides a mobile commu
`
`nication System including a Node B, a particular user
`element (UE) existing in an area occupied by the Node B, a
`neighbor Node B being adjacent to the Node B, and a radio
`network controller (RNC) connected to the Node B and the
`neighbor Node B, for transmitting a control channel having
`an acknowledgement/negative acknowledgement (ACK/
`NACK) information field indicating whether packet data is
`received at the Node B from the particular UE when the
`particular UE moves from the Node B to the handover
`region shared by the Node B and the neighbor Node B
`during reception of high Speed packet data from the Node B,
`a channel quality information (CQI) field indicating a con
`dition of a channel over which the high Speed packet data is