United States Patent 8,009,636
Ozluturk , et al. August 30, 2011
--------------------------------------------------------------------------------
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.
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.
United States Patent 7,970,127
Dick , et al. June 28, 2011
--------------------------------------------------------------------------------
User equipment identification specific scrambling
Abstract
A base station for use in a code division multiple access communication system comprises circuitry configured to process a user equipment identification (UE ID) by 1/2 rate convolutionally encoding the UE ID to produce a code. The code is used by the base station for scrambling a high speed shared control channel (HS-SCCH). The base station is configured to transmit a wireless signal. The wireless signal provides the user equipment with payload data carried on a high speed physical downlink shared channel (HS-PDSCH). The HS-PDSCH is associated with the HS-SCCH.
What is claimed is:
1. A wideband code division multiple access (WCDMA) user equipment (UE) comprising: circuitry in the WCDMA LTE configured to process a high speed shared control channel (HS-SCCH); and circuitry in the WCDMA UE configured to recover payload data from a high speed physical downlink shared channel (HS-PDSCH) associated with the HS-SCCH in response to the HS-SCCH including bits; wherein the bits are a result of a combining of a user specific scrambling sequence associated with the UE with control information; and wherein the user specific scrambling sequence is a result of a 1/2 rate convolutional encoding of a UE identification (ID).
2. The WCDMA UE of claim 1 wherein the control information includes channelization and modulation information of the HS-PDSCH.
3. The WCDMA UE of claim 1 wherein the user specific scrambling sequence is a result of rate matching the 1/2 rate convolutional encoded UE ID.
| 
