Method and subscriber unit for performing an access procedure
DC CAFC
First Claim
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1. A wireless code division multiple access (CDMA) subscriber unit comprising:
- a transmitter configured such that, when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the transmitter successively sends transmissions prior to the subscriber unit receiving from the base station an indication that at least one of the successively sent transmissions has been detected by the base station;
wherein each of the successively sent transmissions is produced using a sequence of chips, wherein the sequence of chips is not used to increase bandwidth;
the transmitter further configured such that the transmitter sends to the base station a message indicating to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station, the message being sent only subsequent to the subscriber unit receiving the indication;
wherein at least two of the successively sent transmissions are produced using different sequences of chips;
wherein each of the successively sent transmissions is shorter than the message; and
wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips, wherein the same sequence of chips is not used to increase bandwidth.
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Abstract
A base station for controlling transmission power during the establishment of a communication channel utilizes the reception of a short code during initial power ramp-up. The short code is a sequence for detection by the base station which has a much shorter period than a conventional access code. The ramp-up starts from a power level that is lower than the required power level for detection by the base station. The power of the short code is quickly increased until the signal is detected by the base station. Once the base station detects the short code, it transmits an indication that the short code has been detected.
166 Citations
30 Claims
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1. A wireless code division multiple access (CDMA) subscriber unit comprising:
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a transmitter configured such that, when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the transmitter successively sends transmissions prior to the subscriber unit receiving from the base station an indication that at least one of the successively sent transmissions has been detected by the base station; wherein each of the successively sent transmissions is produced using a sequence of chips, wherein the sequence of chips is not used to increase bandwidth; the transmitter further configured such that the transmitter sends to the base station a message indicating to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station, the message being sent only subsequent to the subscriber unit receiving the indication; wherein at least two of the successively sent transmissions are produced using different sequences of chips; wherein each of the successively sent transmissions is shorter than the message; and wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips, wherein the same sequence of chips is not used to increase bandwidth. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless code division multiple access (CDMA) subscriber unit comprising:
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a transmitter configured such that, when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the transmitter successively sends transmissions prior to the subscriber unit receiving from the base station an indication that at least one of the successively sent transmissions has been detected by the base station; wherein each of the successively sent transmissions is produced using a sequence of chips, wherein the sequence of chips is not used to increase bandwidth; wherein the sequence of chips is used to convey information to the base station to facilitate establishment of the communication channel to be indicated by the base station; the transmitter further configured such that the transmitter sends to the base station a message indicating to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station, the message being sent only subsequent to the subscriber unit receiving the indication; wherein at least two of the successively sent transmissions are produced using different sequences of chips; wherein each of the successively sent transmissions is shorter than the message; and wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips, wherein the same sequence of chips is not used to increase bandwidth. - View Dependent Claims (7, 8, 9, 10)
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11. A wireless code division multiple access (CDMA) subscriber unit comprising:
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a transmitter configured such that, when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the transmitter successively sends transmissions prior to the subscriber unit receiving from the base station an indication that at least one of the successively sent transmissions has been detected by the base station; wherein each of the successively sent transmissions is produced using a sequence of chips and not using a sequence of bits having a lower rate than the sequence of chips; wherein the sequence of chips is not used to increase bandwidth; the transmitter further configured such that the transmitter sends to the base station a message indicating to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station, the message being sent only subsequent to the subscriber unit receiving the indication; wherein at least two of the successively sent transmissions are produced using different sequences of chips; wherein each of the successively sent transmissions is shorter than the message; and wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips, wherein the same sequence of chips is not used to increase bandwidth. - View Dependent Claims (12, 13, 14, 15)
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16. A communication method for use in a code division multiple access (CDMA) subscriber unit when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the method comprising:
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successively sending transmissions wherein each of the successively sent transmissions is produced using a sequence of chips that is not used to increase bandwidth; wherein the successively sent transmissions are sent prior to receiving an indication from the base station indicating that at least one of the successively sent transmissions has been detected by the base station; receiving the indication; subsequent to receipt of the indication, sending a message to the base station wherein the message indicates to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station; wherein at least two of the successively sent transmissions are produced using different sequences of chips; wherein each of the successively sent transmissions is shorter than the message; and wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips that is not used to increase bandwidth. - View Dependent Claims (17, 18, 19, 20)
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21. A communication method for use in a code division multiple access (CDMA) subscriber unit when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the method comprising:
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successively sending transmissions wherein each of the successively sent transmissions is produced using a sequence of chips that is not used to increase bandwidth; wherein the sequence of chips is used to convey information to the base station to facilitate establishment of the communication channel to be indicated by the base station; wherein the successively sent transmissions are sent prior to receiving an indication from the base station indicating that at least one of the successively sent transmissions has been detected by the base station; receiving the indication; subsequent to receipt of the indication, sending a message to the base station wherein the message indicates to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station; wherein at least two of the successively sent transmissions are produced using different sequences of chips; wherein each of the successively sent transmissions is shorter than the message; and wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips that is not used to increase bandwidth. - View Dependent Claims (22, 23, 24, 25)
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26. A communication method for use in a code division multiple access (CDMA) subscriber unit when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the method comprising:
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successively sending transmissions wherein each of the successively sent transmissions is produced using a sequence of chips and not using a sequence of bits having a lower rate than the sequence of chips; wherein the sequence of chips is not used to increase bandwidth; wherein the successively sent transmissions are sent prior to receiving an indication from the base station indicating that at least one of the successively sent transmissions has been detected by the base station; receiving the indication; subsequent to receipt of the indication, sending a message to the base station wherein the message indicates to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station; wherein at least two of the successively sent transmissions are produced using different sequences of chips; wherein each of the successively sent transmissions is shorter than the message; and wherein each of the successively sent transmissions and the message are produced using portions of a same sequence of chips that is not used to increase bandwidth. - View Dependent Claims (27, 28, 29, 30)
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Specification
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Litigation Data
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Current AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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Original AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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InventorsLomp, Gary R., Ozluturk, Fatih M.
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Primary Examiner(s)Le; Lana N
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Application NumberUS12/116,263Publication NumberTime in Patent Office720 DaysField of Search455/522, 455/69, 455/67.11, 4552261-2264, 375145-147, 375/140, 375354-356, 375/365, 370/335, 370/342, 370/441, 370/310, 370/321, 370/330, 370/336, 370/337, 370/345, 370/347, 370/350, 370/311US Class Current455/522CPC Class CodesH04B 1/707 using direct sequence modul...H04B 1/7075 with code phase acquisitionH04B 1/70753 Partial phase searchH04B 1/70755 Setting of lock conditions,...H04B 1/70758 Multimode search, i.e. usin...H04B 1/7077 Multi-step acquisition, e.g...H04B 1/708 Parallel implementationH04B 2201/70701 featuring pilot assisted re...H04B 2201/70702 Intercell-related aspectsH04B 2201/70703 using multiple or variable ...H04B 2201/7071 with dynamic control of rec...H04B 7/2628 using code-division multipl...H04W 52/36 with a discrete range or se...H04W 52/367 Power values between minimu...H04W 52/50 at the moment of starting c...H04W 52/60 using different transmissio...
