MOBILE STATION CAPABLE OF AND A METHOD FOR GENERATING CHIP PATTERNS FOR TRANSMISSION

• US 20080214222A1
• Filed: 05/06/2008
• Published: 09/04/2008
• Est. Priority Date: 02/06/2003
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Kawamura, Teruo, Sawahashi, Mamoru, Atarashi, Hiroyuki
• Granted Patent: US 7,844,299 B2
• Time in Patent Office: Days
• US Class Current: 455/517
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04L 2025/03522 Frequency domain
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference

Abstract

A base station configured to communicate with a mobile station includes a controlling-information transmitting unit and a receiving unit. The controlling-information transmitting unit is configured to transmit to the mobile station as a set of controlling information, an information set indicating an environment of a cell which is resided by the mobile station, or an information set indicating power of interference from surrounding cells, or an information set indicating a condition of propagation channel. The receiving unit is configured to receive a signal transmitted from the mobile station, based on said set of controlling information, via a variably-controlling process of a spreading factor and a number of chip repetitions.

Claims

1. A base station configured to communicate with a mobile station, the base station comprising:

a controlling-information transmitting unit configured to transmit to the mobile station as a set of controlling information, an information set indicating an environment of a cell which is resided by the mobile station, or an information set indicating power of interference from surrounding cells, or an information set indicating a condition of propagation channel; and

a receiving unit configured to receive a signal transmitted from the mobile station, based on said set of controlling information, via a variably-controlling process of a spreading factor and a number of chip repetitions.

2. The base station as claimed in claim 1, further comprising:

a received timing measuring unit configured to measure timings of receiving from respective mobile stations signals which are transmitted from the respective mobile stations;

a transmitting timing determining unit configured to determine from the timings of receiving from the respective mobile stations timings to be transmitted by the respective mobile stations; and

a reporting unit configured to report to the respective mobile stations an information set on the timings to be transmitted which are determined by said transmitting timing determining unit.

3. The base station as claimed in claim 2, wherein said received timing measuring unit measures, using pilot signals transmitted from the respective mobile stations, the timings of receiving from the respective mobile stations.

4. The base station as claimed in claim 2, further comprising:

a path detecting unit configured to detect a received path having a predetermined power level or above for the respective mobile stations,

wherein said transmitting timing determining unit is configured to determine, based on said detected received paths, the timings to be transmitted by the respective mobile stations.

5. A method of wireless transmission, wherein a base station is configured to communicate with a mobile station, the method comprising:

transmitting to the mobile station as a set of controlling information, an information set indicating an environment of a cell which is resided by the mobile station, or an information set indicating power of interference from surrounding cells, or an information set indicating a condition of propagation channel; and

receiving a signal transmitted from the mobile station, based on said set of controlling information, via a variably-controlling process of a spreading factor and a number of chip repetitions.

6. The method of wireless transmission as claimed in claim 5, further comprising,

measuring timings of receiving from respective mobile stations signals which are transmitted from the respective mobile stations;

determining from the timings of receiving from the respective mobile stations timings to be transmitted by the respective mobile stations; and

reporting to the respective mobile stations an information set on the timings to be transmitted which are determined by said transmitting timing determining unit.

7. The method of wireless transmission as claimed in claim 6, wherein said measuring measures, using pilot signals transmitted from the respective mobile stations, the timings of receiving from the respective mobile stations.

8. The method of wireless transmission as claimed in claim 6, further comprising:

detecting a received path having a predetermined power level or above for the respective mobile stations,

wherein said determining determines, based on said detected received paths, the timings to be transmitted by the respective mobile stations.

9. The method of wireless transmission as claimed in claim 8, further comprising:

removing interference caused by paths from other mobile stations having received timings which do not coincide; and

removing interference caused, due to an effect of the propagation channel, by a delayed wave in a signal which is transmitted from said mobile station.