for summary infringement against Nokia. I think Nokia should fear this patent.
(The following are only parts that I cut and pasted)
United States Patent 8,009,636
Ozluturk , et al. August 30, 2011
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Method and apparatus for performing an access procedure
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.
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Inventors: Ozluturk; Fatih (Port Washington, NY), Lomp; Gary R. (Centerport, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/169,488
Filed: June 29, 2005
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of application Ser. No. 10/866,851, filed Jun. 14, 2004 now U.S. Pat. No. 7,117,004, which is a continuation of application Ser. No. 10/400,343, filed Mar. 26, 2003, which issued on Jan. 4, 2005 as U.S. Pat. No. 6,839,567, which is a continuation of Ser. No. 10/086,320, filed Mar. 1, 2002, which issued on May 27, 2003 as U.S. Pat. No. 6,571,105; which is a continuation of application Ser. No. 09/721,034, filed Nov. 22, 2000, which issued on Dec. 10, 2002 as U.S. Pat. No. 6,493,563; which is a continuation of application Ser. No. 09/003,104, filed Jan. 6, 1998, which issued on Jan. 30, 2001 as U.S. Pat. No. 6,181,949; which is a continuation of application Ser. No. 08/670,162, filed on Jun. 27, 1996, which issued on Nov. 24, 1998 as U.S. Pat. No. 5,841,768; which applications and patents are incorporated herein by reference.
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Claims
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What is claimed is:
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.
2. The subscriber unit of claim 1 wherein at least two of the successively sent transmissions are different.
3. The subscriber unit of claim 1 wherein the plurality of chips are chips of a pseudo noise sequence.
4. The subscriber unit of claim 1 wherein the plurality of chips are chips that are not used for spreading.
5. The subscriber unit of claim 1 wherein the plurality of chips are chips of a spreading sequence.
6. The subscriber unit of claim 1 wherein the successive transmissions facilitate power control when the subscriber unit is first accessing the network.
7. The subscriber unit of claim 6 wherein the power control of the successive transmissions is not closed loop power control.
8. The subscriber unit of claim 1 wherein the subsequent transmission is not closed loop power controlled.
9. The subscriber unit of claim 1 wherein the transmitter is further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter transmits a call setup message to the base station.
10. The subscriber unit of claim 1 wherein the subsequent transmission is produced using an access code and data and uniquely identifies the subscriber unit to the base station.
11. The subscriber unit of claim 1 wherein the transmitter is further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter transmits pilot bits to the base station.
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.
13. A communication method in accordance with claim 12, wherein the series of chips is a pseudo noise sequence.
14. A communication method in accordance with claim 13, wherein the pseudo noise sequence is a sequence that is not used for spreading.
15. A communication method in accordance with claim 12, wherein the series of chips is a spreading sequence.
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.
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