Radio communication system

• US 7,167,454 B2
• Filed: 02/01/2001
• Issued: 01/23/2007
• Est. Priority Date: 02/08/2000
• Status: Expired due to Term

• Current Assignee: Uniloc 2017 LLC (SoftBank Group Corp.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Evans, David H., Fifield, Robert, Caldwell, Richard J.
• Primary Examiner(s): Rao, Seema S.
• Assistant Examiner(s): Mills, Donald L
• Application Number:
  US09/773,418
• Publication Number:
  US 20010012275A1
• Time in Patent Office: 2,182 Days
• Field of Search: 370/231, 370/236, 370278-280, 370/282, 370/287, 370/294, 370/311, 370/329, 370/332, 370/356, 370/428, 370/456, 370/252, 370/253, 455/10, 455/13.3, 455/65, 455/65.1
• US Class Current: 370/278
• 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 plurality of end user stations, each end user station comprising transmission and reception circuitry, in which peer-to-peer communication between end user stations takes place in time slots allocated by the controller, wherein a receiving end user station has means for storing information relating to a transmission parameter of each of the others of the plurality of end user stations and is configured to form, and record, a respective parameter history for each of the plural end user stations from which said receiving end user station has received a prior transmission, and means for adjusting its receiver circuitry prior to reception of a signal from a transmitting end user station using the recorded parameter history of the transmitting end user station.

2. The system as claimed in claim 1, wherein the receiving end user 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.

6. The end user station as claimed in claim 1, wherein 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.

10. The method as claimed in claim 1, wherein the receiving end user 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.

11. The method as claimed in claim 1, wherein the parameter history includes information from a number of previous transmissions by the other end user stations.

12. The system of claim 1, wherein said means for adjusting performs said adjusting if said receiving end user station has received the respective prior transmission.

3. A end user station for use in a radio communication system comprising a controller and a plurality of end user stations, each end user station comprising transmission and reception circuitry, in which peer-to-peer communication between end user stations takes place in time slots allocated by the controller, wherein said end user station for use has means for storing information relating to a transmission parameter of each of the others of the plurality of end user stations and is configured to use the information to form, and record, a respective parameter history for each of the plural end user stations from which said end user station for use has received a prior transmission, and has means for adjusting its receiver circuitry prior to reception of a signal from a transmitting end user station using the recorded parameter history of the transmitting end user station.

4. The end user station as claimed in claim 3, wherein a transmission parameter is the frequency offset of signals from the transmitting end user station.

5. The end user station as claimed in claim 3, wherein a transmission parameter is the signal strength of signals from the transmitting end user station.

13. Said end user station for use according to claim 3, wherein said means for adjusting performs said adjusting if said end user station for use has received the respective prior transmission.

7. A method of operating a radio communication system comprising a controller and a plurality of end user stations, each end user station comprising transmission and reception circuitry, in which peer-to-peer communication between end user stations takes place in time slots allocated by the controller, wherein a receiving end user station stores information relating to a transmission parameter of each of the others of the plurality of end user stations and uses the information to form, and record, a parameter history for each of the plural end user stations from which said receiving end user station has received a prior transmission, and adjusts its receiver circuitry prior to reception of a signal from a transmitting end user station using the recorded parameter history or the transmitting end user station if said receiving end user station has received the respective prior transmission.

8. The method as claimed in claim 7, wherein a transmission parameter being the frequency offset of signals from the transmitting end user station.

9. The method as claimed in claim 7, wherein a transmission parameter being the signal strength of signals from the transmitting end user station.

14. A radio communication system comprising:

a plurality of end user stations, each end user station capable of communication between end user stations, wherein a receiving end user station stores transmission parameter information of each of the other end user stations of the plurality of end user stations and is configured to store a respective parameter history for each of the plural end user stations from which said receiving end user station has received a prior transmission, and a processor to adjust a communication parameter prior to reception of a signal from a transmitting end user station using the recorded parameter history of the transmitting end user station.

15. The system of claim 14, wherein said respective parameter history for each of the plural end user stations includes information relating to two or more previous transmissions by each of the other end user stations.