Patent ID: 7301988
Filing Date: 2007-11-27
Classification: H04B,H04W,Y10S

Abstract:
1. In a code-division-multiple-access (CDMA) system employing spread-spectrum modulation comprising a base station (BS) comprising a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver, and at least one mobile stations (MS) comprising an MS-spread-spectrum transmitter and an MS-spread-spectrum receiver, a method comprising the steps of: transmitting from the MS-spread-spectrum transmitter of the one mobile station a spread-spectrum signal signifying a request to utilize an uplink channel; receiving the request to utilize the uplink channel from the one mobile station at the BS-spread-spectrum receiver; processing the received request to determine whether or not to grant the requested access; if the processing results in a determination to grant access, transmitting from the BS-spread-spectrum transmitter a spread spectrum signal comprising a channel-request-granted message for the one mobile station, the channel-request-granted message comprising control information specifying a transmission start time and a transmission length; receiving the channel-request-granted message from the base station at the MS-spread-spectrum receiver the one mobile station; at the specified transmission start time, initiating transmission from the BS-spread-spectrum transmitter of a spread spectrum signal comprising control signaling related to the granted access over a downlink channel; receiving the spread spectrum signal comprising control signaling at the MS-spread-spectrum receiver the one mobile station; at a predetermined time after the specified transmission start time, starting transmission of a spread spectrum signal containing packet data over the uplink channel from the MS-spread-spectrum transmitter of the one mobile station, in a manner in accord with the received control information; ceasing the transmission of the spread spectrum signal containing packet data over the uplink channel from the mobile station, upon completion of transmission of packet data of the specified transmission length; and transmitting from the MS-spread-spectrum transmitter of the one mobile station a spread-spectrum signal containing format information, wherein the transmission signal containing the format information begins between the specified transmission start time and the predetermined time after the specified start time.