Base station for code assignment for a common packet channel

• US 6,801,517 B2
• Filed: 02/14/2002
• Issued: 10/05/2004
• Est. Priority Date: 05/19/1999
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Eldad, Dick, Stephen G.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US10/075,173
• Publication Number:
  US 20020080745A1
• Time in Patent Office: 964 Days
• Field of Search: 370/130, 370/320, 370/468, 370/348, 370/335, 370/347, 375/130, 375/141
• US Class Current: 370/342
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04J 13/0014 Golay
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station receives access opportunities and packet data over a common packet channel. The common packet channel is defined by a predetermined set of codes and has a plurality of access opportunities. Each access opportunity is defined by a time slot and a signature. A code selection controller selects a currently unused code based on a code associated with a received access opportunity, such that a code, if available, is selected in response to receiving a signature in one of the time slots. The access opportunity defined by the received signature and the one time slot. A transmitter transmits an identifier of the selected available code. The transmitter sends communications encoded with the selected code.

Claims

1. A base station comprising:

a receiver for receiving access opportunities and packet data over a common packet channel, the common packet channel defined by a predetermined set of codes and having a plurality of access opportunities, each access opportunity defined by a time slot and a signature;

a code selection controller associated with the receiver for selecting a currently unassigned code based on a code association with a received access opportunity, such that a code, if available, is selected in response to receiving a signature in one of the time slots, the access opportunity defined by the received signature and the one time slot; and

a transmitter associated with the controller which transmits an identifier of the selected available code, whereby the transmitter sends communications encoded with the selected code.

2. The base station of claim 1 further comprising:

a sequence generator for producing a replica of a received access opportunity signature;

a first mixer for selectively inverting the signature replica in response to the code selection; and

a second mixer for selectively mixing the selectively inverted signature with an in-phase or quadrature phase carrier in response to the code selection to produce the identifier.

3. A base station comprising:

means for receiving access opportunities and packet data over a common packet channel, the common packet channel defined by a predetermined set of codes and having a plurality of access opportunities, each access opportunity defined by a time slot and a signature;

means for selecting a currently unassigned code based on a code association with a received access opportunity, such that a code, if available, is selected in response to receiving a signature in one of the time slots, the access opportunity defined by the received signature and the one time slot; and

means for transmitting for transmitting an identifier of the selected available code, whereby the transmitter sends communications encoded with the selected code.

4. The base station of claim 3 further comprising:

a sequence generator for producing a replica of a received access opportunity signature;

a first mixer for selectively inverting the signature replica in response to the code selection; and

a second mixer for selectively mixing the selectively inverted signature with an in-phase or quadrature phase carrier in response to the code selection to produce the identifier.