Radio Communication system

• US 20010012275A1
• Filed: 02/01/2001
• Published: 08/09/2001
• Est. Priority Date: 02/08/2000
• Status: Active Grant

• Current Assignee: Uniloc 2017 LLC (SoftBank Group Corp.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Fifield, Robert, Caldwell, Richard J., Evans, David H.
• Granted Patent: US 7,167,454 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length

Abstract

In a radio communication system comprising a plurality of stations (100a,100b,100c) operating in a peer-to-peer mode, each station stores information relating to the transmission parameters of other stations. Such information may include the frequency offset and received signal strength of signals from the other stations. One station acts as central controller and allocates time slots for transmission from a first station (100a) to a second station (100b). Before the first station (100a) receives a signal from the second station (100b) it makes initial adjustments to its receiver circuitry depending on the stored information about previous signals received from that station (100b). This simplifies the task of adjusting the receiver circuitry during the preamble of the signal transmitted by the second station (100b).

Claims

1. A radio communication system comprising a controller and a plurality of stations, each station comprising transmission and reception circuitry, in which peer-to-peer communication between stations takes place in time slots allocated by the controller, wherein a receiving station has means for storing information relating to a transmission parameter of each of the others of the plurality of stations and means for adjusting its receiver circuitry prior to reception of a signal from a transmitting station depending on the stored information relating to the transmission parameter of the transmitting station.

2. A system as claimed in

claim 1

, characterised in that the receiving station has means for storing a plurality of values for each transmission parameter relating to signals received at different times and means for operating on a plurality of these values to compensate for drift in the value of the transmission parameter.

3. A station for use in a radio communication system comprising a controller and a plurality of stations, each station comprising transmission and reception circuitry, in which peer-to-peer communication between stations takes place in time slots allocated by the controller, wherein the station has means for storing information relating to a transmission parameter of each of the others of the plurality of stations and means for adjusting its receiver circuitry prior to reception of a signal from a transmitting station depending on the stored information relating to the transmission parameter of the transmitting station.

4. A station as claimed in

claim 3

, characterised in that a transmission parameter is the frequency offset of signals from the transmitting station.

5. A station as claimed in

claim 3

, characterised in that a transmission parameter is the signal strength of signals from the transmitting station.

6. A station as claimed in any one of

claims 3

to

5

, characterised in that means are provided for storing a plurality of values for each transmission parameter relating to signals received at different times and for operating on a plurality of these values to compensate for drift in the value of the transmission parameter.

7. A method of operating a radio communication system comprising a controller and a plurality of stations, each station comprising transmission and reception circuitry, in which peer-to-peer communication between stations takes place in time slots allocated by the controller, wherein a receiving station stores information relating to a transmission parameter of each of the others of the plurality of stations and adjusts its receiver circuitry prior to reception of a signal from a transmitting station depending on the stored information relating to the transmission parameter of the transmitting station.

8. A method as claimed in

claim 7

, characterised by a transmission parameter being the frequency offset of signals from the transmitting station.

9. A method as claimed in

claim 7

, characterised by a transmission parameter being the signal strength of signals from the transmitting station.

10. A method as claimed in any one of

claims 7

to

9

, characterised by the receiving station storing a plurality of values for each transmission parameter relating to signals received at different times and operating on a plurality of these values to compensate for drift in the value of the transmission parameter.