US 200301851591“
`
`(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2003/0185159 A1
`(43) Pub. Date: Oct. 2, 2003
`
`Seo et al.
`
`(54) APPARATUS AND METHOD FOR
`DETERMINING PILOT SIGNAL FIELD
`POSITION INFORMATION FOR UPLINK
`POWER CONTROL IN AN HSDPA MOBILE
`COMMUNICATION SYSTEM
`
`(75)
`
`Inventors: Mycong-Sook Sco, Suwon—slti (KR);
`Sung-Ho Chni, Songnam-shi (KR);
`Ju-Ho Lee, Suwon-shi (KR); Yang-Jun
`Kwak, Yongin—shi (KR)
`
`Correspondence Address:
`Paul J. Farrell, Esq.
`DILWORTH & BARRESE, LLP
`333 Earle Ovington Blvd.
`Uniundalc, NY 11553 (US)
`
`(73) Assignee: SAMSUNG ELECTRONICS CO.,
`LTD., Kyungki—Do (KR)
`
`(2]) Appl. No.:
`
`l0]395,6'l9
`
`(22)
`
`Filed:
`
`Mar. 24, 2003
`
`(30)
`
`Foreign Application Priority Data
`
`Mar. 23, 2002 (KR) 15918r'2002
`
`Publication Classification
`
`Int. Cl.7 ..................................................... H043 7:005
`(51)
`(52) US. Cl.
`............................................ 370;;278; 3703345
`
`(57}
`
`ABSTRACT
`
`Amobilc 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 (C01) 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 C01 field. The particular
`UE includes a pilot signal in a control channel at a position
`based on its own pilot signal [ield position information, and
`transmits the control channel.
`
`HS~DPCCH
`lot UE #1
`
`“SE32?
`
`HS—DPDCH
`for UE #3
`
`12320::
`
`AC-KJNACK at UT!
`
`HS-Piut
`
`0010! DTX
`
`1 slot
`
`2 salt
`
`HS-Piiot OFFSEF=O
`
`ACKINACK or ETX
`
`t stat.
`
`PIS-Pilot OFFSEF=5 bits
`
`ACKJNACK or DTX
`
`0011 or DTX
`
`HS—Pitat
`
`{3012 or DTX
`
`1 slot
`
`
`
`250i!
`
`. HS-P'ilot DFFSEI=10 bits
`
`
`
`
`can arDTX
`
`
`
`
`
`I
`
`1 slot
`
`
`
`001 or DTX
`
`2 sort
`
`HS-Piiut
`
`
`
`HS—Pilot OFFSET=15 bits
`
`APPLE 1021
`
`APPLE 1021
`
`

`

`Patent Application Publication
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`Oct. 2, 2003 Sheet 1 0f 16
`
`US 2003/0185159 A1
`
`
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`Patent Application Publication
`
`Oct. 2, 2003 Sheet 2 0f 16
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`US 2003/0185159 A1
`
`
`
`FIG.2(PRIORART)
`
`1slot
`
`
`
`

`

`Patent Application Publication
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`Oct. 2, 2003 Sheet 3 0f 16
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`US 2003/0185159 A1
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`Patent Application Publication
`
`Oct. 2, 2003 Sheet 4 of 16
`
`US 2003/0185159 A1
`
`
`
`Cell #1 (Primary)
`ULDPDCH+ULDPCCH
`
`+HS_DPCCH
`
`
`
`DLDPCH
`+HS-SCCH
`+HS-PDSCH
`
`UL—DPWW
`ULDPCCH
`
`DLDPCH
`
`
`
`411
`
`FIG.4
`(PRIOR ART)
`
`

`

`Patent Application Publication
`
`3
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`US 2003/0185159 A1
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`Patent Application Publication
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`Oct. 2, 2003
`
`Sheet 6 0f 16
`
`US 2003/0185159 A1
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`Patent Application Publication
`
`Oct. 2, 2003 Sheet 7 0f 16
`
`US 2003/0185159 A1
`
`FINC [701)
`
`Node B (702)
`
`RADIO LINK RECONFIGURATION PREPARE [7033
`
`-
`
`RADIO LINK RECONFIGURATION READY (7041
`
`RADIO LINK HECONFIGURATION COMMIT ”05)
`
`FIG.7
`
`_ ENG (801)
`
`UE I802)
`
`ACTIVE SET UPDATE (803)
`
`ACTIVE SET UPDATE COMPLETE I604)
`
`FIG.8
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 8 0f 16
`
`US 2003/0185159 A1
`
`PERFORM NORMAL POWER CONTROL
`USING ONLY DPCCH PILOT
`
`MEASURE SIGNAL STRENGTH 0F Node B
`THROUGH CPICH MEASUREMENT
`
`904
`
`-
`
`HANDOVER REGION?
`
`.
`
`YES
`
`'
`
`
`
`TRANSMIT MEASUREMENT REPORT TO ERNC
`
`905
`
`RECEIVE ACTIVE SET UPDATE MESSAGE WTTH
`HS-PIIOI OFFSET PARAMETER FROM SM:
`
`905
`
`TRANSMIT ACTIVE SET UPDATE
`COMPLETE MESSAGE TO sane
`
`_
`
`90?
`
`TRANSMIT HfivDPCCH AT ACTIVATION TIME
`AFTER CONTROLLING HS-Pilot OFFSET
`
`9 B
`0
`
`SEPARATELY CONTROL TRANSMISSION POWER
`OF OPCH AND HS—DPCCH BY ANALYZING TPC
`AND HS-TPC TRANSMITTED OVER OLDPCH
`
`909
`
`1 FIGS)
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 9 0f 16
`
`US 2003/0185159 A1
`
`START
`
`1001
`
`RECEIVE MEASUREMENT REPORT FROM UE
`
`1002
`
`DETERMINE Hs-PiIoI OFFSET
`IN HS-DPCCH FOR UE
`
`TRANSMIT RADIO LINK RECONFIGURATlON
`PREPARE MESSAGE WITH DETERMINED
`HS-Pilot OFFSET PARAMETER T0 Node 8
`
`1003
`
`1004
`
`RECEIVE RADIO LINK RECONFIGURATION
`READY MESSAGE FROM Nada B.
`
`.
`
`1005
`
`TRANSMIT RADIO LINK RECONFIGURATION COMMIT
`MESSAGE WITH ACTIVATION TIME TO Node 5
`
`"306
`
`TRANSMIT ACTIVE SET UPDATE MESSAGE
`WITH Hs—PIIoI OFFSET PARAMETER TO UE
`
`1°07
`
`RECEIVE ACTIVE SET UPDATE
`COMPLETE MESSAGE FROM UE
`
`-
`
`1003
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 10 0f 16
`
`US 2003/0185159 A1
`
`START
`
`I I 01
`
`RECEIVE RADIO LINK RECONFIGURATION PREPARE
`MESSAGE WITH DETERMINED HST-Pilot
`.. OFFSET PARAMEIER FROM SFINC
`
`TRANSMIT RADIO LINK RECONFIGURATION READV
`MESSAGE TO SRIIC AFTER SUCCESSFUL
`CHANNEL RESOURCE FIECONFIGUHATION
`
`_
`
`I102
`
`I 193
`
`:_
`
`_
`__
`
`1104|k
`
`RECEIIIE RADIO LINK RECONFICURATION COMMIT
`MESSAGE WITH ACTIVATION TIME FROM SRNC -
`
`_
`RECEIVE HS-DPCCH
`FROM UE AT ACTIVATION TIME
`
`GENERATE HS-TPC BY
`EXTRACTING HS-Pllot
`
`1105
`
`”06
`
`TDM—MULTIPLEX TPC AND HS-TF'C FROM DPCCH
`AND TRANSMIT RESULT OVER DLDPCH
`
`“07
`
`FIG.11
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 11 0f 16
`
`US 2003/0185159 A1
`
`PERFORM NORMAL POWER CONTROL
`USING ONLY DPCCH PILOT
`
`MEASURE SIGNAL STRENGTH OF Nodes 3
`THROUGH CPICH MEASUREMENT
`
`'
`
`1 204
`
`.
`
`HANDOVER REGION?
`
`YES
`
`TRANSMIT MEASUREMENT REPORT TO SRNC
`
`AND HS-TPC TRANSMITTED OVER DLDPCH
`
`TRANSMIT HS-DPGGH AT ACTIVATION TIME
`AFTER CONTROLLING HS-Pilot OFFSET
`
`RECEIVE ACTIVE SET UPDATE MESSAGE WITH
`
`HS-Pllot OFFSET PARAMETER FROM SRNC
`
`TRANSMIT ACTIVE SET UPDATE
`OMPLETE MESSAGE TO SRNC
`
`SEPARATELY CONTROL TRANSMISSION POWER
`
`OF OPCH AND HS—DPCOH BY ANALYZING TPC
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 12 0f 16
`
`US 2003/0185159 A1
`
`RECEIVE MEASUREMENT REPORT FROM UE
`
`1302
`
`INFORM Nada B WHETHER LIE'Is LOCATED IN SOFT
`HANDOVEFI REGION BY TRANSMITTING RADIO
`LINK FIIIIOECOFIGUHATIN PFI'IEHEPA MESSAGE
`
`RECEIVE RADIO LINK HECONFIGURATION
`READY MESSAGE FROM Node 8
`
`-
`
`1304
`
`TRANSMIT RACIO LINK RECONFIOCRATION COMMIT
`MESSAGE WITH ACTIVATION TIME TO Node B
`
`_
`1305 _
`
`'
`
`TRANSMIT ACTIVE SET UPDATE MESSAGE
`WITH Hs-Puot OFFSET PARAMETER TO UE
`
`‘305
`
`RECEIVE ACTIVE SET 'UPOATE
`COMPLETE MESSAGE FROM UE
`
`1307
`
`FIG.13
`
`

`

`Patent Application Publication
`
`Oct. 2, 2003 Sheet 13 0f 16
`
`US 2003/0185159 A1
`
`'
`
`RECEIVE RADIO LINK REGDNFIGUHATION
`PREPARE MESSAGE FROM SRNC
`
`i402
`
`DETERMINE HS-Piiot OFFSET FOR DE
`
`1403
`
`THANSMIT RADIO LINK HECONFIGURATION READY MESSAGE
`WITH HS"Piloi OFFSET TO SHNC AFTER SUCCESSFUL
`CHANNEL RESOURCE RECONFlGUHATION
`
`1404
`
`HECENE RADIO LINK HECONFIGURATION COMMIT
`MESSAGE WITH ACTIVATION TIME FROM SHNC
`
`1405
`
`RECEIVE HSvDPCCH
`FROM UE AT ACTIVATION TIME
`
`GENERATE HS-TPC
`BY EXTRACTING HS-Pilot
`
`1408
`
`1407
`
`TDM-MULTIPLEX TPC AND HS-TPC FROM DPCCH
`AND THANSMIT RESULT OVEFI OEOPCH
`
`.
`I408
`
`

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`Patent Application Publication
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`Oct. 2, 2003
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`Sheet 15 0f 16
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`US 2003/0185159 A1
`
`Oct. 2, 2003
`
`APPARATUS AND METHOD FOR DETERMINING
`PILOT SIGNAL FIELD POSITION INFORMATION
`FOR UPLlN K POWER CONTROL IN AN HSDPA
`MOBILE COMMUNICATION SYSTEM
`
`PRIORITY
`
`[0001] This application claims priority under 35 U.S.(T. §
`119 to an application entitled “Apparatus and Method for
`Determining Pilot Signal Field Position Information for
`Uplink Power Control in an HSDPA Mobile Communication
`System” filed in the Korean Industrial Property ()[Iice on
`Mar. 23, 2002 and assigned Serial No. 2002-15918, the
`contents of which are incorporated herein by reference.
`
`BACKGROUND ()1: THE lNVle'l‘lON
`
`[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,
`highquality radio data packet service has been conducted on
`a 3"l generation mobile communication system divided into
`a synchronous system, also known as a 36PP (3rd 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 lxliV-t)V (L-‘volution 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'“1 generation mobile communication system.
`Further, a 4m 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 (IiS-IJSCI'I), 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
`IISDPA, 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 (UL‘Z), 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 #n can be defined according
`to the type of the MCS. That is, AMC is a technique for
`improving overall system efiiciency 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 I-IARQ), typically
`HARQ, will be described. For HARQ, the following two
`proposals have been provided in order to increase transmis—
`sion etIiciency of automatic retransmission request (ARQ).
`As a
`first proposal,
`IIARQ 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
`HARQ. ln 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
`I} must wait for ACK even though it can cuiTently transmit
`packet data. However, in n—channel SAW HARQ, a UE or a
`Node B can continuously transmit packet data even before
`the ACK for previous packet data is received,
`thereby
`increasing channel efliciency. That is, n logical channels are
`set up between a UL‘ and a Node 1}. 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 PCS, if a UL 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 Uli 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 UL’. 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—
`DSCI-l.
`
`[0010] FIG. 1 schematically illustrates a downlink chan—
`nel structure of a conventional mobile communication sys-
`tem supporting USDPA (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
`“I)l._l)l-’CII”) is comprised of fields defined in Release-99,
`the standard for an existing (.‘DMA 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, Datat 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. A TFCI (Transmitted Format Combi—
`nation Indicator) field transmits a data rate of the Datal 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.
`
`In FIG. 1., a high speed physical downlink shared
`[0011]
`channel (hereinafter referred to as "HS—PDSCH") is used to
`transmit HSDPA packet data from a Node B to a UE. The
`Node I} assigns an orthogonal variable spreading factor
`(OVSI‘) code having a considerably low spreading factor
`(SF) to the IlS-PDSCII over which high-speed packet data
`must be transmitted. For example, an SF=16 OVSF code can
`be assigned to the HS—PDSCH.
`
`Information for controlling the HS—PDSCH is
`[0012]
`transmitted over a high speed shared control channel (here—
`inafter referred to as “lIS-SCCII”).
`IIS-PDSCII control
`information transmitted over the IIS-SCCII includes:
`
`format and resource related
`(1) Transport
`[0013]
`infonnalion (hereinafter referred to as “'I'FRI”): 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:
`
`in n—channel
`(a) HARQ process number:
`[0015]
`SAW HARQ, this indicates a particular channel
`for transmitting packet data among 11 logical chan-
`nels for IIARO.
`
`(b) Repetition version: each time a Node B
`[0016]
`transmits lISl)l-’A packet data to a UE, the Node B
`transmits a selected part of the IISI3PA packet
`data. Therefore, the UE must know a repetition
`version in order to determine which part was
`transmitted.
`
`indicates
`this
`indicator:
`(c) New-data
`[0017]
`whether HSDPA packet data transmitted from a
`Node B to a UL-l is new packet data or retransmit-
`ted packet data.
`
`[0018] As stated above, the I-lS-SCCl-I can be divided into
`a TFRI part and an HARQ information part. The TFRI
`information is information needed to despread the HS—
`PDSCII over which I-ISI)P/\ 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 HARQ
`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. 'l'herefore, a
`Node [3 must
`inform a particular Uti which of the 4
`I-IS—SCCHs
`is assigned thereto. For
`this,
`the Node B
`scrambles the TFRI information part, a first part of the
`IlS-SCCII, with a UE. identifier (ID). The UL-l II) is an
`identifier uniquely assigned to each UE by the Node 1} for
`identification of the UE. The UE. then descramblcs TFRI
`information parts of received HSSCCHs 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 l)l.._Dl-’(.TI-I,
`IlS-SCCII, and [IS-PDSCI-l will be described herein below.
`
`I, I)I._|)PCII and IIS-
`[0&1] As illustrated in FIG.
`SCClIs 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 I-IS-SCCII with its own
`unique U15 It), thereby determining an lIS-SCCI-l assigned
`thereto. If a particular IIS-SCCII is an lIS-SCCII assigned
`thereto, the UE decodes the corresponding HS—SCCH. How—
`ever, if a particular HS—SCCH is not an I-IS—SCCH assigned
`thereto, the UL". discards values acquired by despreading the
`corresponding lIS-SCCII. 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 “"I‘I”) of l'IS-P|)SCII
`falls two slots behind a start point of T” of I-lS-SCCII is to
`enable the UE to first extract the TFRI information from the
`
`the UE demodulates and decodes a
`HSSCCH. Finally,
`signal transmitted over the corresponding I-IS—PDSCH based
`on control information detected from the IIS-SCCI I, thereby
`detecting IISDPA packet data.
`
`[0M2] A method for forming an uplink control channel
`supporting IISDPA will also be proposed. There is a method
`of modifying an existing uplink dedicated physical control
`channel (UL_DPCCH) that does not support HSDPA,
`in
`order to support lISDPA. However,
`the existing UI._I)-
`PCCII, 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 IISI3PA 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 “UI._I)PDCII"} and an
`
`

`

`US 2003/0185159 A1
`
`Oct. 2, 2003
`
`(hereinafter
`uplink dedicated physical control channel
`referred to as “UL_DPCCH”), both supporting Release—99,
`and a high speed uplink dedicated physical control channel
`(hereinafter referred to as “l-IS-I3PCCI'I”) for supporting
`IISDPA.
`
`[0024] RefelTing 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 UL_DPCCH is comprised of
`a Pilot signal field, a TFCI bit field, a feedback information
`(hereinafter referred to as “1411”) 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 infom'iation when a trans-
`mission diversity technique is used. The TPC field is used
`for controlling transmission power of a downlink channel.
`The UL_DPCCH is spread with an OVSF code before being
`transmitted, and a spreading factor {SF} used for the ()VSI"
`code is lixed to 256.
`
`In IISDPA, a UL". determines whether data trans-
`[0025]
`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 I3. The channel quality report
`information is called a channel quality indicator (hereinafter
`referred to as “CQI”). In FIG. 3,
`the HS—DPCCH also
`transmits a Pilot signal
`field (US-Pilot) for
`IISI3PA in
`addition to the ACKJNACK and the (:01 information.
`
`[0026] 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 13s is limited to 2, for the convenience of explana-
`tion. In FIG. 4, a Node B#'l401 transmits IIS-PDSCII to a
`UE 411, and a Node B#2403 transmits DL_DPCH to the UE
`411 and receives UL_DPCCH from the UE 411.
`
`channels
`the
`receiving
`and
`transmitting
`In
`[0027]
`described in conjunction with FIGS. 1 and 3, a general
`power control method used in the existing Release—99
`UM'I‘S 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 Btu-401 and the
`Node B#2403 receive UL_DPDCH and UL_DPCCH trans—
`mitted from the U15 411, and report the receipt to a radio
`network controller (hereinafter referred to as “RN(I”) 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 I} out of the Node B#.l401
`and the Node I3#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
`
`U13. 411 simultaneously receives DL_DPU-Is transmitted
`from the Node B#1401 and the Node B#2403. As described
`
`above, for power control between a particular Node B
`supporting
`IISI)PA and
`the UL:
`411,
`IlS-PDSCII,
`IlS-SCTCII, and DL_DPCII are transmitted in a downlink
`direction, and HS—DPCCH, UL_DPDCH, and ULgDPCCH
`are transmitted in an uplink direction.
`
`[0029] UL_DPDCH and UL_DPCCH transmitted from
`the UE 411 to the Node Btu-401 and the Node B#2403 are
`analyzed by the RNC. If the UL] 411 currently located in the
`cell overlapping region communicates. with any one of the
`Node Bs, the U15. 411 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 B#140'l that transmits IISDPA packet
`data, and is not received at the Node 13#2403. Therefore, if
`the HS—DPCCH is transmitted to the Node B#1401 at the
`
`transmission power applied to the UL_DPDCH and the
`UL_DPCCH, the Node B#1401 may fail to correctly ana—
`lyze IIS-DPCCII which is needed to transmit IISDPA packet
`data. That is, if the [IS-DPCCI'I information is not correctly
`transmitted to the Node B#1401, an operation of determin—
`ing an HARQ type and an MCS level or selecting the best
`cell in IiCS cannot be correctly achieved, causing a mal-
`function of IISDI’A.
`
`[0030] Therefore, when the Ulfl 411 receiving I'ISI3PA
`packet data is located in the soft handover region, transmis-
`sion power of UL_DPDCH, UL_DPCCH, and HS—DPCCH
`is separater controlled. For that purpose,
`the UE 41]
`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 (IIS-TPC) command for only the
`HS—DPCCH. Describing the separate power control,
`the
`Node Ball-401 generates a TPC command from the Pilot on
`the DPCCII and an lIS-TPC command from the IIS-Pilot on
`the I'IS-DPCCI'I every slot. Meanwhile, the Node II#2403,
`since it does not provide an I-lSI.)l-’A service, generates only
`an existing TPC command from the Pilot on the DPCCH.
`The Node B#l401 then transmits the generated TPC and
`IIS-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
`perfon'n power control on IIS-DPCCII based on an IIS-TPC
`command transmitted once every 3 slots from the Node
`B#1401, and at the same time, perform power control on
`UL_DPDCH and UL_DPCCH based on a TPC command
`transmitted from the Node I3#2403.
`
`In FIG. 3, the ACKINACK is transmitted over one
`[0031]
`slot of 3-slot IISDPA Tfl of IIS-l)P(T(.‘II, and N-bit IIS-
`Pilot and CQI information are transmitted over the other two
`slots. When transmission of the ACKJNACK or the C01
`information is not required, the UE 411 subjects the ACK}
`NACK or CQI field to discontinuous transmission (DTX).
`The I'lS-Pilot, as described in conjunction with FIG. 4, is
`intended to improve reliability of IIS-DPCCII 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 Ufi, the IIS-Pilot can be optionally transmitted
`only when the UE. 411 is located in the soft handover region.
`
`In FIG. 3, a 'l'l‘I start point of IIS-DPCCII is
`[0032]
`different from slot start points of I)l-’I)(III and DPCCII for
`
`

`

`US 2003/0185159 Al
`
`Oct. 2, 2003
`
`the following reasons. That is, in the current IISDPA 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 I)[._DPCII. A slot start point
`of the DL_DPCH is dilferently 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
`[IS-PDSCI-I is shared by all UEs, a 'I'l‘l start point of the
`IIS-DPCCII will be the same for all UEs.
`
`[0033] Because all Ulfs within Node Bs providing an
`IISI3PA service transmit all of ACKJNACK, IIS-Pilot, and
`CO] information on the HS—DPCCH at the same time, uplink
`interference among the UEs may be increased. Herein, since
`the ACIQ’NACK and the COI information are transmitted to
`each Uli only when necessary, interference among the UEs
`may not be considerable. However, since the IIS-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 IlS-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 inconect IIS-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
`down] ink packet access.
`
`invention to
`is another object of the present
`It
`[0035]
`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.
`
`It is further another object of the present invention
`[0036]
`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.
`
`It is yet another object of the present invention to
`[0037]
`provide a UlL' 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.
`
`It is still another object of the present invention to
`[0038]
`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.
`
`In accordance with a first aspect of the present
`[0039]
`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