Multi-beam cellular base station, mobile station and method for sending spread spectrum signal

• US 7,116,650 B2
• Filed: 04/04/2002
• Issued: 10/03/2006
• Est. Priority Date: 04/13/2001
• Status: Expired due to Fees

• Current Assignee: KDDI Corporation
• Original Assignee: KDDI Corporation
• Inventors: Inoue, Takashi, Yamaguchi, Akira, Amano, Yoshiaki, Takeuchi, Yoshio
• Primary Examiner(s): Vu, Huy D.
• Assistant Examiner(s): Han, Clemence
• Application Number:
  US10/115,016
• Publication Number:
  US 20020177468A1
• Time in Patent Office: 1,643 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

A multi-beam cellular base station is for sending a spread spectrum signal to at least one mobile station, the base station comprising: first antenna for sending a common channel by a common beam that a directional pattern is formed previously; second antenna for sending a dedicated channel by a dedicated beam that a directional pattern is formed for each mobile station; and switching means for switching a sending time section of the common beam and a sending time section of the dedicated beam so that the sending time sections do not overlap within a time slot, the common beam and the dedicated beam are sent by same frequency.

Claims

1. A system comprising a mobile station and a multi-beam cellular base station, the mobile station for communicating with the multi-beam cellular base station, said multi-beam cellular base station comprising first antenna for sending a common channel by a common beam that has a beam pattern for covering a service area of said multi-beam cellular base station, second antenna for sending a dedicated channel by a dedicated beam that a directional pattern is formed for each mobile station, and switching means for switching a sending time section of said common beam and a sending time section of said dedicated beam so that said sending time sections do not overlap within a time slot that is associated with those sending time sections, said common beam and said dedicated beam are sent by same frequency, said mobile station comprising switching means for switching a received beam to said common channel or said dedicated channel based on a slot synchronization signal.

2. A mobile station as claimed in claim 1,

wherein said common channel including a common pilot channel, and said dedicated channel including a dedicated traffic channel and a dedicated pilot channel, and

wherein said mobile station further comprising:

estimation means for estimating a channel characteristic from said dedicated pilot channel received; and

demodulation means for demodulating said dedicated channel by using said estimated channel characteristic.

3. A cellular system comprising multi-beam cellular base stations and single beam cellular base stations, said multi-beam cellular base station having first antenna for sending a common channel by a common beam that a directional pattern is formed previously, second antenna for sending a dedicated channel by a dedicated beam that a directional pattern is formed for each mobile station, and switching means for switching a sending time section of said common beam and a sending time section of said dedicated beam so that said sending time sections do not overlap within a time slot, said common beam and said dedicated beam are sent by same frequency, and said single beam cellular base station sending said common channel and said dedicated channel by same directional pattern beam,

wherein said multi-beam cellular base station including a common pilot channel in said common channel, and including a dedicated traffic channel and a dedicated pilot channel in said dedicated channel, and

wherein said single beam cellular base station sending said dedicated traffic channel in a section of a data format, where said dedicated pilot channel is sent in the case of said multi-beam cellular base station, and sending a dedicated traffic channel data in a same section of a data format, where said dedicated traffic channel is sent in the case of multi-beam cellular base station.

4. A cellular system as claimed in claim 3,

wherein first transmission information bit rate and second transmission information bit rate are controlled to become equal, said first transmission information is included in signal of a dedicated traffic channel received from said multi-beam cellular base station, and said second transmission information is included in signal of a dedicated traffic channel received from said single beam cellular base station.

5. A cellular system comprising a mobile station, a multi-beam cellular base station and a single beam cellular base station, the mobile station for communicating with the multi-beam cellular base station and the single beam cellular base station, said multi-beam cellular base station having first antenna for sending a common channel by a common beam that a directional pattern is formed previously, second antenna for sending a dedicated channel by a dedicated beam that a directional pattern is formed for each mobile station, and switching means for switching a sending time section of said common beam and a sending time section of said dedicated beam so that said sending time sections do not overlap within a time slot, said common beam and said dedicated beam are sent by same frequency, and said single beam cellular base station sending said common channel and said dedicated channel by same directional pattern beam, said mobile station comprising means for distinguishing whether said cellular base station for sending a signal is said multi-beam base station or said single beam base station, said signal is processed according to the identification.