Subscriber unit for controlling initial power ramp-up using short codes

• US 6,904,294 B2
• Filed: 08/02/2002
• Issued: 06/07/2005
• Est. Priority Date: 06/27/1996
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Lomp, Gary R., Ozluturk, Fatih M.
• Primary Examiner(s): Gary, Erika A.
• Assistant Examiner(s): Beamer, Temica M.
• Application Number:
  US10/210,920
• Publication Number:
  US 20020186669A1
• Time in Patent Office: 1,040 Days
• Field of Search: 455/522, 455/434, 455/515, 455/63, 455/67.1, 370/318, 370/320, 370/324, 370/335, 370/342
• US Class Current: 455/522
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 1/70753 Partial phase search
• CPC Class Codes: H04B 1/70755 Setting of lock conditions, e.g. threshold
• CPC Class Codes: H04B 1/70758 Multimode search, i.e. using multiple search strategies
• CPC Class Codes: H04B 1/7077 Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
• CPC Class Codes: H04B 1/708 Parallel implementation
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/7071 with dynamic control of receiver resources
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands

Abstract

A subscriber unit for controlling transmission power during the establishment of a communication channel utilizes the transmission of a short code during initial power ramp-up. The short code is a sequence which has a much shorter period than a conventional access code. The ramp-up starts from an initial power level which is quickly increased, while repeatedly transmitting the short code until a detection signal is received by the base station. The use of short codes limits power overshoot and interference.

Claims

1. A subscriber unit for regulating transmission power, comprising:

means for transmitting a periodic short code entirely at an initial predetermined power level, including means for repeatedly retransmitting said periodic short code, each transmission occurring at a successively higher power level, said periodic short code being entirely transmitted at each successively higher power level, prior to increasing the power level; and

means for terminating transmission of said periodic short code and transmitting an access code which is longer than the short code at the power level when a confirmation signal to the short code is received.

2. The subscriber unit of claim 1 wherein said initial predetermined power level is lower than a power level required for detection of said periodic short code by a base station.

3. The subscriber unit of claim 1 wherein said subscriber unit further comprises means for periodically modifying said short code.

4. A subscriber unit for regulating transmission power, comprising:

means for transmitting a periodic short code entirely at an initial predetermined power level, including means for repeatedly retransmitting said periodic short code, each retransmission occurring at a successively higher power level, said periodic short code being entirely transmitted at each successively higher power level, prior to increasing the power level;

means for terminating transmission of said periodic short code and transmitting an access code which is longer than the short code at the power level present upon receipt of a confirmation signal to the short code; and

means for employing the maintained power level upon initiation of a subsequent operation.

5. The subscriber unit of claim 4 wherein said initial predetermined power level is lower then a power level required for detection of said periodic short code by a base station.

6. The subscriber unit of claim 4 wherein said subsequent operation includes means for transmitting an access signal.