Transmitting/receiving apparatus using a plurality of spreading codes

• US 6,236,672 B1
• Filed: 01/19/2000
• Issued: 05/22/2001
• Est. Priority Date: 05/24/1996
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko
• Primary Examiner(s): Le, Amanda T.
• Application Number:
  US09/487,207
• Time in Patent Office: 489 Days
• Field of Search: 375/140, 375/141, 375/144, 375/146, 375/147, 370/335, 370/342, 370/479, 370/528, 370/493
• US Class Current: 375/141
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/206 for modulated signals
• CPC Class Codes: H04L 2001/0096 Channel splitting in point-to-point links

Abstract

Transmitting/receiving apparatuses are installed in a base station and a mobile station, respectively, to perform mutual transmission and reception by using a plurality of spreading codes. The transmitting/receiving apparatus installed in the base station has a block for designating to the mobile station the kind and the number of spreading codes used in a reverse link from the mobile station to the base station through a forward link at the time that communication with the mobile station is started. The transmitting/receiving apparatus installed in the mobile station has a block for transmitting a signal to the base station by using spreading codes of the designated kind and number. The transmitting/receiving apparatus installed in the base station further has a block for detecting receiving quality values of the signal transmitted from the mobile station with respect to individual spreading codes used in the mobile station, a block for deciding whether or not the detected receiving quality values exceed a prescribed quality value, and a block for finally setting the kind and number of spreading codes to be used in the reverse link on the basis of the spreading codes for which the detected receiving quality values are determined to exceed the prescribed quality value.

Claims

1. A transmitting/receiving apparatus for performing transmission and reception of voice and data by using a plurality of spreading codes, comprising:

means for detecting whether or not the voice is in a soundless state; and

means for using spreading codes used in transmission of the voice for use in transmission of the data when the voice is determined to be in the soundless state.