Abstract:
A method and wireless transmit/receive unit (WTRU) for utilizing channel control information associated with enhanced uplink (EU) transmission is disclosed. The WTRU receives information via radio resource control (RRC) signaling and receives downlink (DL) control information for at least EU transmission. The WTRU determines whether the DL control information is intended for the WTRU based at least upon a first forty bit specific code sequence and a second forty bit specific code sequence received in at least one time slot and determines whether the DL control information is the first type or the second type. The WTRU utilizes the DL control information of the first type or the second type for at least EU transmission on a condition that the DL control information is intended for the WTRU.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 11,709,970, filed Feb. 23, 2007, which is a continuation of U.S. patent application Ser. No. 10/902,740, filed Jul. 29, 2004, which issued on Apr. 3, 2007 as U.S. Pat. No. 7,200,405 which claims the benefit of U.S. Provisional Application No. 60/523,049, filed on Nov. 18, 2003, all of which are incorporated by reference as if fully set forth. 
    
    
     FIELD OF INVENTION 
     The present invention is related to a wireless communication 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 
     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). 
     In frequency division duplex (FDD), an HS-SCCH is sent by means of a spreading factor (SF)=128 channelization 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) channelization-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). 
     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-ARQ information, redundancy version and a new data indicator along with a WTRU-specific cyclic redundancy check (CRC). 
     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. 
     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 disadvantages with this scheme, such as WTRU complexity, WTRU battery efficiency, and DL spreading code usage. 
     Therefore, an efficient EU channel assignment scheme is necessary for supporting both an EU and an HSDPA operation. 
     SUMMARY 
     In one embodiment, the present invention is a method and wireless communication system for providing channel assignment information for supporting a UL channel 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 message 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. 
     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 
       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: 
         FIG. 1  is a block diagram of a wireless communication system operating in accordance with the present invention; 
         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 
         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 
     The present invention will be described with reference to the drawing figures wherein like numerals represent like elements throughout. 
     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. 
     The present invention is applicable to any type of wireless communication systems such as UMTS-time division duplex (TDD) and FDD, time division synchronous code division multiple access (TDSCDMA), code division multiple access 2000 (CDMA 2000), and CDMA in general or any other type of wireless communication system. 
     The features of the present invention may be incorporated into an integrated circuit (IC) or be configured in a circuit comprising a multitude of interconnecting components. 
     The present invention will be described in reference 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. 
       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 controlled 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. 
     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 transmissions to and from the WTRU  106  through an HS-DSCH and an EU channel, respectively. The radio resources assignment information for both the HS-DSCH and the EU is transmitted through the common control channel  112 . 
     In accordance with the present invention, the common 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 distinguish 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 transmission is intended for assigning radio resources for the DL or the UL transmissions. 
     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 indicating that the demodulated transmission is for UL transmission, 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 transmission, or that the codes corresponding to the channelization-code-set are assigned to UL transmissions. 
     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. 
     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 demodulated transmission is for UL transmission, rather than DL transmission. For example, a WTRU-specific CRC computed 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  succeeds in decoding the received transmission with a WTRU-specific CRC, 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 CRC, the WTRU  106  recognizes that the transmission is intended for an EU. 
     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. 
     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 transmission 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 masking sequence, the WTRU  106  recognizes that the transmission is intended for an EU. 
     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. 
     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&#39;s inverted ID for EU may be used to indicate a second WTRU&#39;s HSDPA service. Therefore, simultaneous detection of presence of a UL resource assignment channel and an HS-SCCH is facilitated. 
     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 transmission 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. 
     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. 
     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. 
     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. 
       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 predetermined 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 message is for the assignment of radio resources for DL transmission 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). 
     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 hereinabove.