(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2005/0105487 A1
`(43) Pub. Date:
`May 19, 2005
`Rudolf et al.
`
`US 2005O105487A1
`
`(54) METHOD AND SYSTEM FOR PROVIDING
`CHANNEL ASSIGNMENT INFORMATION
`USED TO SUPPORT UPLINK AND
`DOWNLINK CHANNELS
`
`Related U.S. Application Data
`(60) Provisional application No. 60/523,049, filed on Nov.
`18, 2003.
`
`(75) Inventors: Marian Rudolf, Montreal (CA);
`Stephen G. Dick, Nesconset, NY (US);
`Philip J. Pietraski, Huntington Station,
`NY (US)
`
`Correspondence Address:
`VOLPE AND KOENIG, PC.
`DEPT. ICC
`UNITED PLAZA, SUITE 1600
`30 SOUTH 17TH STREET
`PHILADELPHIA, PA 19103 (US)
`
`(73) Assignee: InterDigital Technology Corporation,
`Wilmington, DE (US)
`
`(21) Appl. No.:
`
`10/902,740
`
`(22) Filed:
`
`Jul. 29, 2004
`
`Publication Classification
`
`(51) Int. Cl. ................................................... H04Q 7/00
`(52) U.S. Cl. .............................................................. 370/329
`(57)
`ABSTRACT
`A method and wireleSS communication System for providing
`channel assignment information used to Support an uplink
`(UL) channel and a downlink (DL) channel. The system
`includes at least one Node-B and at least one wireleSS
`transmit/receive unit (WTRU). The WTRU communicates
`with the Node-B via a common control channel, the UL
`channel and the DL channel. The WTRU receives a message
`from the Node-B via the common control channel. The
`message includes an indication of whether the message is
`intended for assigning radio resources to the UL channel or
`the DL channel. The WTRU determines whether the mes
`sage is intended for the WTRU and, if so, the WTRU
`determines whether the message is for assigning radio
`resources to the UL channel or the DL channel. The WTRU
`takes an appropriate action based on whether the message is
`for assigning radio resources to the UL channel or the DL
`channel.
`
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`Patent Application Publication May 19, 2005 Sheet 1 of 2
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`US 2005/0105487 A1
`
`112
`
`202
`
`200
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`204
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`206
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`RECEIVE AMESSAGE FROMANODE-B.
`
`DETERMINE WHETHER THE
`MESSAGE IS INTENDED FORA
`PARTICULAR WTRU
`
`DETERMINE WHETHER THE
`MESSAGE IS FOR RADIO RESOURCE
`ASSIGNMENT FOR DL OR UL
`
`
`
`
`
`
`
`
`
`
`
`208
`
`210
`
`TAKE APPROPRIATEACTIONDEPENDING ON THE
`DETERMINATION OF STEP 208
`
`
`
`FIG 3
`
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`Patent Application Publication May 19, 2005 Sheet 2 of 2
`
`US 2005/0105487 A1
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`US 2005/0105487 A1
`
`May 19, 2005
`
`METHOD AND SYSTEM FOR PROVIDING
`CHANNEL ASSIGNMENT INFORMATION USED
`TO SUPPORT UPLINK AND DOWNLINK
`CHANNELS
`
`CROSS REFERENCE TO RELATED
`APPLICATION
`0001) This application claims the benefit of U.S. Provi
`sional Application No. 60/523,049 filed on Nov. 18, 2003,
`which is incorporated by reference as if fully set forth.
`
`FIELD OF INVENTION
`0002 The present invention is related to a wireless com
`munication System. More particularly, the present invention
`is related to a method and System for providing channel
`assignment information to Support uplink and downlink
`transmissions.
`
`BACKGROUND
`0003 High speed downlink packet access (HSDPA) has
`been developed to increase downlink (DL) efficiency and
`throughput in universal mobile telecommunication System
`(UMTS) Release 5 (R5) wideband code division multiple
`access (W-CDMA) systems. The key advantages of HSDPA
`as compared to UMTS R99/R4 are fast and dynamic link
`adaptation in the DL and a fast layer 1 hybrid automatic
`repeat request (H-ARQ). Fast link adaptation is achieved by
`fast Scheduling DL transmissions in a base Station, coupled
`with fast layer 1 DL Signaling channels. The Signaling
`channel, a high speed shared control channel (HS-SCCH),
`conveys radio resource allocation information to a plurality
`of wireless transmit/receive units (WTRUs).
`0004) In frequency division duplex (FDD), an HS-SCCH
`is sent by means of a spreading factor (SF)=128 channel
`ization code during a three (3) time slot transmission time
`interval (TTI). The HS-SCCH indicates that data would be
`transmitted to a WTRU on a high speed downlink shared
`channel (HS-DSCH) after a particular time offset. The
`HS-SCCH carries the following information: 1) channeliza
`tion-code-Set information (7 bits); 2) modulation Scheme
`information (1 bit); 3) transport-block size information (6
`bits); 4) H-ARQ process information (3 bits); 5) redundancy
`and constellation version (3 bits); 6) new data indicator (1
`bit); and 7) a WTRU identity (16 bits).
`0005) The HS-SCCH is sent over three (3) time slots (2
`ms TTI), but consists of two (2) fields. Field 1 (first time
`Slot) contains channelization code mapping and modulation
`format information; and field 2 (second and third time slots)
`contains transport block size, H-ARO information, redun
`dancy version and a new data indicator along with a WTRU
`Specific cyclic redundancy check (CRC).
`0006 Alternatively, an enhanced uplink (EU) increases
`uplink (UL) efficiency and throughput. H-ARQ and Node-B
`scheduling is part of the EU. Similar to an HSDPA, a new
`shared DL control channel for EU operation provides fast
`and dynamic allocation of UL radio resources for UL
`transmissions. The shared DL control channel for the EU
`needs to ensure low allocation latencies and efficient radio
`resources management for UL transmissions. Hereinafter,
`the shared DL control channel for the purposes of an EU is
`Simply referred to as a UL resource assignment channel.
`
`0007. In order to implement an EU along with an
`HSDPA, another UL resource assignment channel for the
`EU could be introduced on top of an existing HS-SCCH for
`an HSDPA. Thus, it is possible to introduce a separate set of
`SF=128 DL channels as UL resource assignment channels.
`With this approach, a WTRU would be required to monitor
`one or more UL resource assignment channels in addition to
`the HS-SCCHs for an HSDPA operation. Although this
`approach is conceptually simple, there are many disadvan
`tages with this scheme, such as WTRU complexity, WTRU
`battery efficiency, and DL Spreading code usage.
`0008. Therefore, an efficient EU channel assignment
`Scheme is necessary for Supporting both an EU and an
`HSDPA operation.
`
`SUMMARY
`0009. In one embodiment, the present invention is a
`method and wireleSS communication System for providing
`channel assignment information for Supporting a UL chan
`nel and a DL channel. The System includes at least one
`Node-B and at least one WTRU. The WTRU communicates
`with the Node-B via a common control channel, the UL
`channel and the DL channel. The WTRU receives a message
`from the Node-B via the common control channel. The
`message includes an indication of whether the message is
`intended for assigning radio resources to the UL channel or
`the DL channel. The WTRU determines whether the mes
`sage is intended for the WTRU and, if so, the WTRU
`determines whether the message is for assigning radio
`resources to the UL channel or the DL channel. The WTRU
`takes an appropriate action based on whether the message is
`for assigning radio resources to the UL channel or the DL
`channel.
`0010. In another embodiment, the present invention is a
`method and time-slotted wireleSS communication System.
`The system includes at least one Node-B, a radio network
`controller (RNC) which controls the Node-B, and at least
`one WTRU which communicates with the Node-B via a
`common control channel, a UL channel and a DL channel.
`The RNC transmits a message to the WTRU indicating
`which time slot TTIs Support UL channel transmissions and
`which time slot TTIs Support DL channel transmissions.
`BRIEF DESCRIPTION OF THE DRAWINGS
`0011. A more detailed understanding of the invention
`may be had from the following description of a preferred
`example, given by way of example and to be understood in
`conjunction with the accompanying drawing wherein:
`0012 FIG. 1 is a block diagram of a wireless commu
`nication System operating in accordance with the present
`invention;
`0013 FIG. 2 is a look-up table for channelization code
`Set mapping in an HSDPA, which is utilized in conjunction
`with the system of FIG. 1; and
`0014 FIG. 3 is a flowchart of a process including method
`Steps for implementing uplink channel assignment Signaling
`in accordance with the present invention.
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENTS
`0.015 The present invention will be described with ref
`erence to the drawing figures wherein like numerals repre
`Sent like elements throughout.
`
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`May 19, 2005
`
`0016. Hereafter, the terminology “WTRU” includes but
`is not limited to a user equipment, a mobile Station, a fixed
`or mobile Subscriber unit, a pager, or any other type of
`device capable of operating in a wireleSS environment.
`When referred to hereafter, the terminology “Node-B”
`includes but is not limited to a base Station, a Site controller,
`an acceSS point or any other type of interfacing device in a
`wireleSS environment.
`0.017. The present invention is applicable to any type of
`wireless communication systems such as UMTS-time divi
`sion duplex (TDD) and FDD, time division synchronous
`code division multiple access (TDSCDMA), code division
`multiple access 2000 (CDMA2000), and CDMA in general
`or any other type of wireleSS communication System.
`0.018. The features of the present invention may be incor
`porated into an integrated circuit (IC) or be configured in a
`circuit comprising a multitude of interconnecting compo
`nentS.
`0019. The present invention will be described in refer
`ence to an HSDPA and an EU, and the terms HSDPA and EU
`are used interchangeably with DL and UL, respectively.
`However, it should be understood that the reference to an
`HSDPA and an EU is just for describing the preferred
`embodiment of the present invention, and the teachings of
`the present invention may be applied to any System for
`utilizing a common control channel for transmitting channel
`assignment information for both UL and DL transmissions
`simultaneously.
`0020 FIG. 1 is a block diagram of a system 100 for
`Supporting UL and DL operations in accordance with the
`present invention. The system 100 includes an RNC 102, a
`Node-B 104, and a WTRU 106. The Node-B 104 is con
`trolled by the RNC 102, and dynamically allocates radio
`resources for both UL and DL transmissions from and to the
`WTRU 106. Three channels are established between the
`Node-B 104 and the WTRU 106. The channels are a DL
`channel 108, a UL channel 110, and a common control
`channel 112. The common control channel 112 is utilized for
`transmission of channel assignment information for both UL
`and DL transmissions.
`0021. The Node-B 104 is configured to support an
`HSDPA and EU operation. Therefore, each Node-B 104
`dynamically allocates radio resources for DL and UL trans
`missions to and from the WTRU 106 through an HS-DSCH
`and an EU channel, respectively. The radio resources assign
`ment information for both the HS-DSCH and the EU is
`transmitted through the common control channel 112.
`0022. In accordance with the present invention, the com
`mon control channel 112 is utilized for the transmission of
`radio resources assignment information for both UL and DL
`transmissions and a Specific indication is provided to dis
`tinguish whether the radio resource assignment is for either
`UL or DL transmission. Therefore, the common control
`channel 112 occupies a shared DL radio resource Space, as
`defined by a set of SF=128 channelization codes, for both
`DL and UL transmissions simultaneously, and the WTRU
`106 is configured to recognize whether a particular trans
`mission is intended for assigning radio resources for the DL
`or the UL transmissions.
`0023. In accordance with a first embodiment of the
`present invention, an indication that a particular radio
`
`resource is assigned for a UL transmission is provided by
`means of one or more of the impossible combinations in the
`channelization code set mapping in a current HSDPA. FIG.
`2 is a look-up table for channelization code Set mapping
`currently used in the HSDPA. An HS-SCCH uses seven (7)
`bits to inform the WTRU 106 which SF=16 channelization
`codes are used for the corresponding HS-DSCH. Out of the
`128 possible combinations, eight (8) combinations are not
`currently used in an HSDPA (see the labeled “redundant
`area” in FIG. 2). One or more of the eight (8) unused
`combinations is used for assigning radio resources or indi
`cating that the demodulated transmission is for UL trans
`mission, not DL transmission. Therefore, if the WTRU 106
`determines that a channelization-code-Set corresponds to
`one of the impossible combinations of FIG. 2, the WTRU
`106 recognizes that the transmission is for assignment of
`radio resources for UL transmission, rather than DL trans
`mission, or that the codes corresponding to the channeliza
`tion-code-Set are assigned to UL transmissions.
`0024.
`In accordance with a second embodiment of the
`present invention, an indication that a particular radio
`resource is assigned for UL transmission is provided by
`means of a WTRU-specific CRC. Under current HSDPA
`specifications, a WTRU-specific CRC is contained in an
`HS-SCCH field 2. A 16-bit CRC is computed from the
`information to be transmitted, and the computed CRC is
`masked with a unique 16-bit WTRU identity (ID). The
`masked CRC is transmitted to a WTRU 106 as a WTRU
`specific CRC.
`0025. In accordance with the second embodiment of the
`present invention, this WTRU-specific CRC is modified in
`a unique and deterministic way to indicate that the demodu
`lated transmission is for UL transmission, rather than DL
`transmission. For example, a WTRU-specific CRC com
`puted for an HSDPA is inverted for an EU before performing
`a channel coding. A WTRU 106 performs two (2) different
`comparisons, preferably simultaneously, in performing a
`CRC of the received transmission. If the WTRU 106 Suc
`ceeds in decoding the received transmission with a WTRU
`specific CRC, the WTRU 106 recognizes that the transmis
`Sion is intended for an HSDPA, and if the WTRU 106
`Succeeds in decoding the received transmission with an
`inverted WTRU-specific CRC, the WTRU 106 recognizes
`that the transmission is intended for an EU.
`0026. In accordance with a third embodiment of the
`present invention, an indication that a particular radio
`resource is assigned for an EU is provided by means of a
`WTRU-specific masking sequence. Under current HSDPA
`Specifications, a 40-bit Sequence of field 1 is masked with a
`40-bit WTRU-specific intermediate code sequence which is
`generated from a 16-bit WTRU ID.
`0027. In accordance with the third embodiment, the
`WTRU-specific masking on field 1 is modified in a unique
`and deterministic way to indicate that a transmission is
`intended for an EU, not for an HSDPA. For example, the
`inverted 16-bit CRC generated in the second embodiment
`may be used to derive the 40-bit long masking Sequence. If
`the WTRU 106 Succeeds in decoding the received transmis
`sion with a WTRU-specific masking sequence, the WTRU
`106 recognizes that the transmission is intended for an
`HSDPA, and if the WTRU 106 succeeds in decoding the
`received transmission with an inverted WTRU-specific
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`May 19, 2005
`
`masking sequence, the WTRU 106 recognizes that the
`transmission is intended for an EU.
`0028. With this method, the WTRU 106 can make the
`distinction whether an EU or an HSDPA channel assignment
`has been transmitted after having received only field 1 of the
`HS-SCCH transmission.
`0029) Alternatively, WTRU IDs are allocated by the
`network in such a way that a particular WTRU ID does not
`collide with another WTRU ID. For example, a first
`WTRU’s inverted ID for EU may be used to indicate a
`second WTRU's HSDPA service. Therefore, simultaneous
`detection of presence of a UL resource assignment channel
`and an HS-SCCH is facilitated.
`0.030. In accordance with a fourth embodiment of the
`present invention, an indication that a particular radio
`resource is assigned for an EU is provided by means of radio
`resource control (RRC) context signaling. Preferably, a
`Node-B 104 allocates separate radio resources for transmis
`Sion of UL radio resources assignment and DL radio
`resources assignment. Alternatively, an RNC 102 allocates
`Separate radio resources for transmission of UL radio
`resources assignment and DL radio resources assignment by
`using RRC Signaling messages.
`0.031) For example, an RRC signaling message from the
`RNC 102 may inform a WTRU 106 in which TTIs to expect
`an HS-SCCH or a UL resource assignment channel. Under
`current R5 HSDPA specifications, fifteen (15) time slots
`include one (1) frame, and three (3) time slots include one
`(1) TTI. “Even” TTIs may include, for example, time slots
`2, 4, 6, 8, 10, 12 and 14, and "odd TTIs may include, for
`example, time slots 1, 3, 5, 7, 9, 11, 13 and 15.
`0032. In accordance with the present invention, an RRC
`transmits signals indicating that a transmission in “even”
`TTIS is for an HS-SCCH and a transmission in “odd TTIs
`is for a UL resource assignment channel. By not allowing a
`transmission for an HS-SCCH to be transmitted in "odd'
`TTIs, backwards compatibility with R5 WTRUs can be
`ensured. The same set of SF=128 resources can be used for
`an HS-SCCH and a UL resource assignment channel.
`0033. In accordance with a fifth embodiment of the
`present invention, an indication that a particular radio
`resource is assigned for an EU is provided by means of layer
`1 indication on an associated DL dedicated channel (DCH).
`One or more bits on the associated DL DCH are used to
`indicate imminent occurrence of a UL resource assignment
`channel as opposed to an HS-SCCH by means of a fixed and
`pre-determined timing relationship.
`0034 FIG. 3 is a flowchart of a process 200 including
`method steps for implementing UL channel assignment
`Signaling in accordance with the present invention. After the
`process 200 is initiated (step 202), a message for radio
`resource assignment is transmitted via a common control
`channel from a Node-B 104 to a WTRU 106. The WTRU
`106 receives and demodulates the message using predeter
`mined codes every predetermined TTI, for example, every 2
`ms (step 204). The WTRU 106 then determines if the
`message is intended for the WTRU 106 (step 206). A
`WTRU-specific CRC may be utilized for this purpose. If the
`WTRU 106 determines that the message is intended for the
`WTRU 106, the WTRU 106 determines whether the mes
`Sage is for the assignment of radio resources for DL trans
`
`mission or UL transmission implementing one of the
`embodiments of the present invention described above (Step
`208). The WTRU 106 then takes appropriate actions (step
`210) depending on the decision in step 208 to receive or
`transmit data packet via DL or UL channels. For example,
`the WTRU 106 may recognize exactly when to initialize a
`data reception procedure via the DL channel 108 or when to
`initialize a data transmission procedure via the UL channel
`110. Currently, an HS-SCCH for an HSDPA announces an
`incoming data packet for the WTRU with a fixed two (2) slot
`offset, whereas the present invention can inform the WTRU
`when it has an opportunity to transmit a packet via the UL,
`(e.g., four slots from now).
`0035 While this invention has been particularly shown
`and described with reference to preferred embodiments, it
`will be understood by those skilled in the art that various
`changes in form and details may be made therein without
`departing from the Scope of the invention described herein
`above.
`
`What is claimed is:
`1. In a wireleSS communication System including at least
`one Node-B and at least one wireleSS transmit/receive unit
`(WTRU), a method for providing channel assignment infor
`mation used to Support an uplink (UL) channel and a
`downlink (DL) channel, the information being transmitted
`from the Node-B to the wireless transmit/receive unit
`(WTRU) via a common control channel, the method com
`prising:
`(a) the WTRU receiving a message from the Node-B via
`the common control channel, the message including an
`indication of whether the message is intended for
`assigning radio resources to the UL channel or the DL
`channel;
`(b) the WTRU determining whether the message is
`intended for the WTRU;
`(c) the WTRU determining whether the message is for
`assigning radio resources to the UL channel or the DL
`channel; and
`(d) the WTRU taking an appropriate action based on the
`determination of step (c).
`2. The method of claim 1 wherein the appropriate action
`includes the WTRU initializing a data reception procedure
`via the DL channel.
`3. The method of claim 1 wherein the appropriate action
`includes the WTRU initializing a data transmission proce
`dure via the UL channel.
`4. The method of claim 1 wherein the indication is a
`utilization of a set of mapping combinations for channel
`ization codes for the UL channel or the DL channel.
`5. The method of claim 1 wherein the indication is a
`utilization of a WTRU-specific cyclic redundancy check
`(CRC) for the UL channel or the DL channel.
`6. The method of claim 5 wherein the WTRU-specific
`CRC for the UL channel is an inverted version of a WTRU
`specific CRC for the DL channel.
`7. The method of claim 5 wherein a WTRU-specific CRC
`is generated using an identification (ID) assigned to the
`WTRU.
`
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`May 19, 2005
`
`8. A wireleSS communication System for providing chan
`nel assignment information used to Support an uplink (UL)
`channel and a downlink (DL) channel, the System compris
`ing:
`(a) at least one Node-B; and
`(b) at least one wireless transmit/receive unit (WTRU) in
`communication with the Node-B via a common control
`channel, the UL channel and the DL channel, wherein:
`(i) the WTRU receives a message from the Node-B via
`the common control channel, the message including
`an indication of whether the message is intended for
`assigning radio resources to the UL channel or the
`DL channel;
`(ii) the WTRU determines whether the message is
`intended for the WTRU;
`(iii) the WTRU determines whether the message is for
`assigning radio resources to the UL channel or the
`DL channel; and
`(iv) the WTRU takes an appropriate action based on
`whether the message is for assigning radio resources
`to the UL channel or the DL channel.
`9. The system of claim 8 wherein the appropriate action
`includes the WTRU initializing a data reception procedure
`via the DL channel.
`10. The system of claim 8 wherein the appropriate action
`includes the WTRU initializing a data transmission proce
`dure via the UL channel.
`11. The system of claim 8 wherein the indication is a
`utilization of a set of mapping combinations for channel
`ization codes for the UL channel or the DL channel.
`12. The system of claim 8 wherein the indication is a
`utilization of a WTRU-specific cyclic redundancy check
`(CRC) for the UL channel or the DL channel.
`13. The system of claim 12 wherein the WTRU-specific
`CRC for the UL channel is an inverted version of a WTRU
`specific CRC for the DL channel.
`14. The system of claim 12 wherein a WTRU-specific
`CRC is generated using an identification (ID) assigned to the
`WTRU.
`15. A wireless transmit/receive unit (WTRU) comprising:
`(a) means for receiving a message including an indication
`of whether the message is intended for assigning radio
`resources to an uplink (UL) channel or a downlink
`(DL) channel;
`(b) means for determining whether the message is
`intended for the WTRU;
`(c) means for determining whether the message is for
`assigning radio resources to the UL channel or the DL
`channel; and
`(d) means for taking an appropriate action based on
`whether the message is for assigning radio resources to
`the UL channel or the DL channel.
`16. The WTRU of claim 15 wherein the appropriate action
`includes the WTRU initializing a data reception procedure
`via the DL channel.
`17. The WTRU of claim 15 wherein the appropriate action
`includes the WTRU initializing a data transmission proce
`dure via the UL channel.
`
`18. The WTRU of claim 15 wherein the indication is a
`utilization of a set of mapping combinations for channel
`ization codes for the UL channel or the DL channel.
`19. The WTRU of claim 15 wherein the indication is a
`utilization of a WTRU-specific cyclic redundancy check
`(CRC) for the UL channel or the DL channel.
`20. The WTRU of claim 19 wherein the WTRU-specific
`CRC for the UL channel is an inverted version of a WTRU
`specific CRC for the DL channel.
`21. The WTRU of claim 19 wherein a WTRU-specific
`CRC is generated using an identification (ID) assigned to the
`WTRU.
`22. An integrated circuit (IC) comprising:
`(a) means for receiving a message including an indication
`of whether the message is intended for assigning radio
`resources to an uplink (UL) channel or a downlink
`(DL) channel;
`(b) means for determining whether the message is
`received at its intended destination;
`(c) means for determining whether the message is for
`assigning radio resources to the UL channel or the DL
`channel; and
`(d) means for taking an appropriate action based on
`whether the message is for assigning radio resources to
`the UL channel or the DL channel.
`23. The IC of claim 22 wherein the appropriate action
`includes initializing a data reception procedure via the DL
`channel.
`24. The IC of claim 22 wherein the appropriate action
`includes initializing a data transmission procedure via the
`UL channel.
`25. The IC of claim 22 wherein the indication is a
`utilization of a set of mapping combinations for channel
`ization codes for the UL channel or the DL channel.
`26. The IC of claim 25 wherein the indication is a
`utilization of a WTRU-specific cyclic redundancy check
`(CRC) for the UL channel or the DL channel.
`27. The IC of claim 26 wherein the WTRU-specific CRC
`for the UL channel is an inverted version of a WTRU
`specific CRC for the DL channel.
`28. The IC of claim 26 wherein a WTRU-specific CRC is
`generated using an identification (ID) assigned to the
`WTRU.
`29. A time-slotted wireless communication system for
`providing channel assignment information, the System com
`prising:
`(a) at least one Node-B;
`(b) a radio network controller (RNC) which controls the
`Node-B; and
`(c) at least one wireless transmit/receive unit (WTRU)
`which communicates with the Node-B via a common
`control channel, an uplink (UL) channel and a down
`link (DL) channel, wherein the RNC transmits a mes
`Sage to the WTRU indicating which time slot trans
`mission time intervals (TTIs) support UL channel
`transmissions and which time slot TTIs support DL
`channel transmissions.
`30. The system of claim 29 wherein the system is a
`frequency division duplex (FDD) system.
`31. The system of claim 29 wherein the message com
`prises radio resource control (RRC) context signaling.
`
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`TESLA, INC.TESLA, INC.
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`US 2005/0105487 A1
`
`May 19, 2005
`
`32. The system for claim 29 wherein a high speed shared
`control channel (HS-SCCH) is transmitted in the TTIs that
`Support the DL channel.
`33. The system for claim 29 wherein a UL resource
`assignment channel is transmitted in the TTIs that Support
`the UL channel.
`34. The system for claim 29 wherein the WTRU deter
`mines whether the message is for assigning radio resources
`for DL transmission or UL transmission.
`35. In a time-slotted wireless communication system
`including at least one Node-B in communication, a radio
`network controller (RNC) which controls the Node-B, and at
`least one wireless transmit/receive unit (WTRU) which
`communicates with the Node-B via a common control
`channel, an uplink (UL) channel and a downlink (DL)
`channel, a method comprising:
`the RNC transmitting a message to the WTRU indicating
`which time slot transmission time intervals (TTIs)
`
`Support UL channel transmissions and which time slot
`TTIs support DL channel transmissions.
`36. The method of claim 35 wherein the system is a
`frequency division duplex (FDD) system.
`37. The method of claim 35 wherein the message com
`prises radio resource control (RRC) context signaling.
`38. The method for claim 35 further comprising trans
`mitting a high speed shared control channel (HS-SCCH) in
`the TTIs that support the DL channel.
`39. The method for claim 35 further comprising trans
`mitting a UL resource assignment channel in the TTIs that
`Support the UL channel.
`40. The method for claim 35 further comprising the
`WTRU determining whether the message is for assigning
`radio resources for DL transmission or UL transmission.
`
`
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`TESLA, INC.TESLA, INC.
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