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 . fig1 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 . fig2 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 fig2 ). 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 fig2 , 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 . fig3 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 .