Uplink scrambling during random access

  • US 8,717,996 B2
  • Filed: 03/27/2012
  • Issued: 05/06/2014
  • Est. Priority Date: 08/08/2007
  • Status: Active Grant
First Claim
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1. A method implemented in a user terminal for accessing a radio channel, comprising:

  • sending a first message corresponding to a random access request message including a random access preamble to a radio base station associated with a cell using a random access channel radio resource;

    receiving a second message corresponding to a random access response message from the radio base station indicating a timing change, an identified radio resource, and a user terminal identifier indicating a scrambling sequence from a first set of uplink scrambling sequences that are not specifically assigned to a user terminal;

    determining an uplink scrambling sequence based on the user terminal identifier included in the second message corresponding to the random access response message;

    adjusting a timing at the user terminal for transmitting signals to the radio base station based on information received in the random access response message;

    based on the adjusted timing, transmitting a third message corresponding to a scheduled uplink transmission including a user terminal identity specific to the user terminal at least within the cell to the radio base station over the identified radio resource, wherein the third message is scrambled using the determined uplink scrambling sequence; and

    receiving a fourth message corresponding to a contention resolution message from the radio base station.

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