Method and apparatus for performing an access procedure
DC CAFC
First Claim
Patent Images
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, the transmitter successively sends transmissions wherein each of the transmissions are derived from a first length of a plurality of chips until the subscriber unit receives from a base station associated with the network an indication that at least one of the transmissions has been detected by the base station; and
the transmitter further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter sends a subsequent transmission derived from a second length of the plurality of chips, wherein the first length is less than the second length.
0 Assignments
Litigations
0 Petitions
Accused Products
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.
187 Citations
39 Claims
-
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, the transmitter successively sends transmissions wherein each of the transmissions are derived from a first length of a plurality of chips until the subscriber unit receives from a base station associated with the network an indication that at least one of the transmissions has been detected by the base station; and the transmitter further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter sends a subsequent transmission derived from a second length of the plurality of chips, wherein the first length is less than the second length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A communication method for use with a code division multiple access (CDMA) subscriber unit, the method comprising:
-
producing, based on a series of chips, a first portion of the series of chips, and a second portion of the series of chips, the first portion having a first length and the second portion having a second length which is greater than the first length; sending a first radio frequency (RF) transmission from an antenna of the CDMA subscriber unit, the first (RF) transmission including chips that are derived from the first portion; in an absence of an acknowledgement signal received by the CDMA subscriber unit, sending a second RF transmission from an antenna of the subscriber unit, wherein the second RF transmission includes chips derived from the first portion; and in response to an acknowledgement received by the CDMA subscriber unit, a third RF transmission is sent, the third RF transmission is derived from the second portion. - View Dependent Claims (13, 14, 15)
-
-
16. A code division multiple access (CDMA) subscriber unit, comprising:
-
a circuit configured to produce, based on a series of chips, a first portion of the series of chips and a second portion of the series of chips, the first portion having a first length and the second portion having a second length greater than the first length; and an antenna coupled to the circuit, wherein the circuit is configured to send from the antenna a first radio frequency (RF) transmission including chips derived from the first portion, wherein in an absence of an acknowledgement received by the CDMA subscriber unit, the circuit is configured to send a second RF transmission from the antenna wherein the second RF transmission includes chips derived from the first portion; and in response to an acknowledgement received by the CDMA subscriber unit, a third RF transmission is sent, the third RF transmission is derived from the second. - View Dependent Claims (17, 18, 19, 20, 21)
-
-
22. A wireless subscriber unit comprising:
-
a transmitter configured to send a plurality of transmissions to a base station of a wireless network as part of an access procedure, wherein a first transmission of the plurality of transmissions includes a first plurality of transmitted chips, and a second transmission of the plurality of transmissions includes a second plurality of transmitted chips that are different from the first plurality of transmitted chips; a receiver configured to receive an indication that a base station has received at least one of the plurality of transmissions; and wherein the transmitter is further configured to send, in response to the receiver receiving the indication, a subsequent transmission including a third plurality of transmitted chips;
wherein each of the first and second plurality of transmitted chips is shorter than the third plurality of transmitted chips. - View Dependent Claims (23, 24, 25, 26, 27, 28)
-
-
29. A wireless code division multiple access (CDMA) subscriber unit comprising:
-
a transmitter configured such that, when the subscriber unit is accessing a CDMA network, the transmitter successively sends transmissions having a first plurality of chips until the subscriber unit receives an indication from a base station that the base station has detected at least one of the transmissions; the transmitter further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter sends a transmission having a second plurality of chips; wherein the first plurality of chips and the second plurality of chips are derived from a third plurality of chips; and wherein the first plurality of chips has fewer chips than the second plurality of chips. - View Dependent Claims (30, 31, 32)
-
-
33. A subscriber unit for use in a code division multiple access (CDMA) network, comprising:
-
a processor configured to produce first chip sequences for use in deriving respective first transmissions, each first transmission having a same first length; wherein the first chip sequences are not used for spreading when deriving the first transmissions and wherein at least two of the first chip sequences are different; a transmitter configured to send the first transmissions to a base station of the CDMA network one after another; and a receiver configured to receive an acknowledgement sent from the base station of the CDMA network to the subscriber unit, wherein the acknowledgement indicates that at least one of the first transmissions has been detected by the base station; the processor further configured to produce a second chip sequence for use in deriving a second transmission having a second length greater than the same first length; wherein the first chip sequences and the second chip sequence are derived from a third chip sequence; the transmitter further configured to send the second transmission to the base station subsequent to the receiver receiving the acknowledgement. - View Dependent Claims (34, 35, 36, 37, 38, 39)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
Litigation Data
-
Current AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
-
Original AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
-
InventorsLomp, Gary R., Ozluturk, Fatih
-
Primary Examiner(s)Le; Lana N
-
Application NumberUS11/169,488Publication NumberTime in Patent Office2,253 DaysField of Search455/522, 455/69, 455/67.11, 455/226.1, 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, 370/311, 370/474US Class Current370/335CPC 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...
