Uplink scrambling during random access
DC CAFC
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;
selecting one of the first set of uplink scrambling sequences 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 selected one of the first set of uplink scrambling sequences; and
receiving a fourth message corresponding to a contention resolution message from the radio base station.
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Abstract
The technology described in this case facilitates random access by a user terminal with a radio base station. A user terminal determines one of a first type of uplink scrambling sequences and generates a random access message using the determined one of the first type of uplink scrambling sequences. The random access message is transmitted to the base station. The user terminal receives from the base station a second, different type of uplink scrambling sequence and uses it for subsequent communication with the radio base station. For example, the first uplink scrambling sequences may be specifically associated with the radio base station'"'"'s cell area or a random access radio channel associated with the radio base station, but they are not specifically assigned to any user terminal, and the second uplink scrambling sequence may be selected from a second set of uplink scrambling sequences specifically assignable to individual user terminals.
46 Citations
15 Claims
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1. A method implemented in a user terminal for accessing a radio channel, comprising:
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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; selecting one of the first set of uplink scrambling sequences 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 selected one of the first set of uplink scrambling sequences; and receiving a fourth message corresponding to a contention resolution message from the radio base station. - View Dependent Claims (2, 3, 4, 5)
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6. A method implemented in a base station associated with a cell for responding to user terminals requesting service from the base station over a radio channel, comprising:
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receiving a first message corresponding to a random access request message from a user terminal including a random access preamble using a random access channel radio resource; transmitting a second message corresponding to a random access response message to the user terminal indicating a timing change, an identified radio resource, and a user terminal identifier indicating a scrambling sequence from a set of uplink scrambling sequences that are not specifically assigned to a user terminal; receiving over the identified radio resource a third message corresponding to a scheduled uplink transmission from the user terminal including a user terminal identity specific to the user terminal at least within the cell, wherein the random access message is scrambled using one of the set of uplink scrambling sequences selected using the user terminal identifier; and transmitting a fourth message corresponding to a contention resolution message to the user terminal.
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7. A user terminal for requesting service from a base station having a cell area where the base station offers radio communications service, comprising:
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a radio transmitter configured to transmit a first message corresponding to a random access request message including a random access preamble to the base station using a random access channel radio resource; a radio receiver configured to receive 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; and electronic processing circuitry configured to select one of the first set of uplink scrambling sequences based on the user terminal identifier included in the random access response message and to adjust a timing at the user terminal for transmitting signals to the base station based on information received in the random access response message; wherein based on the adjusted timing, the transmitter is configured to transmit a third message to the base station over the identified radio resource, wherein the third message corresponds to a scheduled uplink transmission including a user terminal identity specific to the user terminal at least within the cell area, and wherein the third message is scrambled using the selected one of the first set of uplink scrambling sequences, and wherein the receiver is configured to receive a fourth message corresponding to a contention resolution message from the base station. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A radio base station associated with a cell for responding to user terminals requesting service from the base station over a radio channel, comprising circuitry configured to:
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receive a first message corresponding to a random access request message from the one user terminal including a random access preamble using a random access channel radio resource; transmit a second message corresponding to a random access response message to the one user terminal 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; receive over the identified radio resource a third message corresponding to a scheduled uplink transmission from the user terminal including a user terminal identity specific to the user terminal at least within the cell, wherein the third message is scrambled using one of athe set of uplink scrambling sequences selected using the user terminal identifier; and transmit a fourth message corresponding to a contention resolution message to the one user terminal. - View Dependent Claims (14, 15)
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Specification
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Litigation Data
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Current AssigneeTelefonaktiebolaget LM Ericsson
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Original AssigneeTelefonaktiebolaget LM Ericsson
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InventorsParkvall, Stefan, Dahlman, Erik, Tynderfeldt, Tobias
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Primary Examiner(s)Ngo, Ricky
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Assistant Examiner(s)Gidado, Rasheed
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Application NumberUS11/835,782Publication NumberTime in Patent Office1,728 DaysField of Search370/329, 370/331, 370/335, 370/342, 455/436, 455/522US Class Current370/342CPC Class CodesH04W 72/02 Selection of wireless resou...H04W 72/21 in the uplink direction of ...H04W 74/004 in the uplink, i.e. towards...H04W 74/0833 Random access procedures, e...
