Universal wireless communication system, a transmission protocol, a wireless communication station, and a radio base station

• US 6,167,237 A
• Filed: 02/26/1998
• Issued: 12/26/2000
• Est. Priority Date: 02/28/1997
• Status: Expired due to Term

• Current Assignee: Uniloc 2017 LLC (SoftBank Group Corp.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Rapeli, Juha
• Primary Examiner(s): LE, THANH C
• Application Number:
  US09/031,374
• Time in Patent Office: 1,034 Days
• Field of Search: 455/422, 455/426, 455/450, 455/445, 455/458, 455/522, 455/62, 455/63, 455/67.1
• US Class Current: 455/63.1
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters

Abstract

A universal wireless communication system comprising at least two wireless subsystems is proposed which is operated at the edge of spectral efficiency while at the same time allowing wireless communication stations to operate such that optimal power saving is obtained under acceptable transmission conditions. A radio base station of one of the subsystems measures whether a wireless communication station of another one of the subsystems causes adjacent channel interference in a channel its own subsystem. If so, the radio base station commands the wireless communication station of the other substation to adjust its spectral transmission characteristic such that the transmit spectrum becomes narrower. If no interference is detected the wireless communication station of the other subsystem is allowed to broaden its spectrum so that a less complex transmit signal processing, such as filtering, can be applied and thus power saving is achieved.

Claims

1. A universal wireless communication system in which an available radio frequency spectrum is divided among at least a first and a second wireless subsystem, the first wireless subsystem comprising at least a first radio base station and a first plurality of wireless communication stations, and the second wireless subsystem comprising at least a second radio base station and a second plurality of wireless communication stations, characterised in that for operating the wireless communication system up to the limits of spectral band while at the same time allowing wireless communication stations to operate such that minimal power consumption is obtained under acceptable transmission conditions, the wireless communication system comprises a transmission protocol for adapting a spectral transmission characteristic of a wireless communication station comprising the following steps:

a) a radio base station of one of the wireless subsystems determines whether a wireless communication station of the other wireless subsystem is causing adjacent channel interference in a channel of the one wireless subsystem, whereby the wireless communication station of the other subsystem is identified by said radio base station,

b) the radio base station of the one wireless subsystem issues a command to the wireless communication station of the other wireless subsystem in accordance with the determined interference situation, and

c) the identified wireless communication station adjusts its spectral transmission characteristic from a first to a second characteristic in accordance with the command.

2. A universal wireless communication system according to claim 1, wherein said radio base station identifies the wireless communication station from an at regular intervals transmitted code, in particular a training sequence, like signal replacing the known training sequence at regular intervals, the code being transmitted by the wireless communication station.

3. A universal wireless communication system according to claim 1, wherein it is determined whether there is interference in the channel of the one wireless subsystem, and, if so, determining the identity of the interfering wireless communication station.

4. A universal wireless communication system according to claim 3, wherein interference measurements are done on the basis of energy to bit error measurements, the command being an instruction for narrowing the identified interfering transmit spectrum if the interference is not acceptable and being an instruction for allowing to broaden the transmit spectrum if the interference is acceptable.

5. A universal wireless communication system according to claim 1, wherein the spectral transmission characteristic is adjusted by adjusting a modulation type and/or by modifying the linearity of a power amplifier and/or by adjusting transmit signal processing characteristics, and/or adjusting transmit power filter characteristics.

6. A universal wireless communication system according claim 1, wherein the command is issued via a common control channel of the system.

7. A universal wireless communication system according to claim 1, wherein the command is issued via a network comprised in the system to which the first and the second wireless subsystem are coupled.

9. A wireless communication station suitable for use in a system according to any one of the claim 1, which wireless communication station is arranged for processing a command as issued from said radio base station and for adapting its transmission characteristic accordingly.

10. A radio base station for use in one subsystem of a system according to any one of the claim 1, which radio base station is arranged for issuing a command to a wireless communication station of another subsystem of the system for adapting its transmission characteristic in accordance to adjacent channel measurements carried out by said radio base station.

8. A transmission protocol for a universal wireless communication system in which an available radio frequency spectrum is divided among at least a first and a second wireless subsystem, the first wireless subsystem comprising at least a first radio base station and a first plurality of wireless communication stations, and the second wireless subsystem comprising at least a second radio base station and a second plurality of wireless communication stations, characterised in that for operating the wireless communication system up to the limits of spectral band while at the same time allowing wireless communication stations to operate such that minimal power consumption is obtained under acceptable transmission conditions, the transmission protocol is arranged for adapting a spectral transmission characteristic of a wireless communication station in accordance with the following steps:

a) a radio base station of one of the wireless subsystems determines whether a wireless communication station of the other wireless subsystem is causing adjacent channel interference in a channel of the one wireless subsystem, whereby the wireless communication station of the other subsystem is identified by said radio base station,

b) the radio base station of the one wireless subsystem issues a command to the wireless communication station of the other wireless subsystem in accordance with the determined interference situation, and

c) the identified wireless communication station adjusts its spectral transmission characteristic from a first to a second characteristic in accordance with the command.