Claims
- 1. A method for improving the detectability of a broadcast control channel of each of a plurality of a base stations in a radio system in which the transmitting and receiving frequency resources of respective transceiver units have been divided on the TDMA/FDMA principle into a plurality of channels, the base stations each comprising equipment for establishing a radio connection to radio units in respective radio coverage areas of the respective base stations, and a transmitter for transmitting a broadcast control channel, at least two of the base stations being arranged to transmit the broadcast control channel by utilizing a same pre-predetermined frequency channel comprising:
- adjusting the transmission power used by each respective transmitter for transmitting on said predetermined frequency channel by each of said at least two base stations so as to be lower in those time slots in which the broadcast control channel is not transmitted by the transmitter of the respective base station than said transmission power is in that or those time slots in which the broadcast control channel is transmitted by the transmitter of the respective base station.
- 2. The method according to claim 1, wherein:
- transmissions by respective ones of said at least two base stations in the time slots of said predetermined frequency channel in which the broadcast control channel is not transmitted, are transmitted at a level which is 1 to 5 dB lower than are respective transmissions in those time slots of said predetermined frequency channel in which the broadcast control channel is transmitted by the transmitter of the respective base station.
- 3. The method according to claim 1, wherein:
- each said base station is a base station of Digital Communication System or Groupe Special Mobile mobile communication system.
- 4. The method according to claim 1, further comprising:
- mutually synchronizing said at least two base stations so that they transmit the broadcast control channel at different times.
- 5. A cellular radio system, comprising:
- a plurality of base stations, having respective transceiver units the transmitting and receiving frequency resources of which are divided on the TDMA/FDMA principle into a plurality of channels, each of said base stations comprising means for establishing a radio connection to radio units in a respective radio coverage area, and means for transmitting a broadcast control channel, said base stations including at least two base stations arranged to transmit the broadcast control channel by utilizing a same predetermined frequency channel, at least one of said base stations comprising control means for adjusting the transmission power of transmissions by the respective transmitter on said predetermined frequency channel so as to be lower in that or those time slots in which the respective transmitter does not transmit the broadcast control channel.
- 6. The cellular radio system according to claim 5, wherein:
- said at least two base stations each include control means arranged to adjust the transmission power so that the time slots of said predetermined frequency channel in which the broadcast control channel is not transmitted, are transmitted on at a level which is 1 to 5 dB lower than are transmissions by the respective transmitter in those time slots of the frequency channel in which the broadcast control channel is transmitted.
- 7. The cellular radio system according to claim 5, wherein:
- said system is Groupe Special Mobile or Digital Cellular System cellular radio system.
Priority Claims (1)
Number |
Date |
Country |
Kind |
942462 |
May 1994 |
FIX |
|
Parent Case Info
This application claims benefit of international application PCT/FI95/00285 filed May 24, 1995
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/FI95/00285 |
5/24/1995 |
|
|
1/25/1996 |
1/25/1996 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO95/33313 |
12/7/1995 |
|
|
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5487185 |
Halonen |
Jan 1996 |
|
5570352 |
Poyhonen |
Oct 1996 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 414 352 |
Feb 1991 |
EPX |
0 462 601 |
Dec 1991 |
EPX |
9216059 |
Sep 1992 |
WOX |