Claims
- 1. A method for transmitting calls of different priorities in a cellular network which comprises in each cell at least one base station communicating with subscriber terminals within its area, and in which network the base station transmits power control information messages to the subscriber terminals, which can adjust their transmit power on the basis of the power control information messages from the base station, the calls of the network having different levels of priority, the method comprising:
- a subscriber terminal signaling to the base station that it has a high priority for a call; and
- the base station taking into account the priority of the call when it transmits power control information messages,
- wherein calls with a high priority use a higher transmit power than what is allowed for calls with a lower priority,
- wherein, when a call set-up message for a prioritized call is transmitted, a higher transmit power is used than in other calls, and
- wherein the level of the transmit power used in the prioritized call depends on the power control information messages transmitted by the base station and on the traffic load of the cell.
- 2. The method according to claim 1, wherein the power control information messages transmitted by the base station to the subscriber terminals take into account the priority level of the call in such a way that a higher transmit power is used in calls with a high priority than in calls with a lower priority in similar circumstances.
- 3. The method according to claim 1, further comprising:
- a subscriber terminal signaling to the base station a value differing from the real value of the transmit power it uses in a call with a higher priority,
- the base station transmitting a power control command to the subscriber terminal on the basis of this differing value, and the subscriber terminal using a higher transmit power than the power control command transmitted by the base station to the subscriber terminal indicates.
- 4. The method according to claim 1, wherein, when a call set-up message for a prioritized call is transmitted, the transmit power value indicated by an open loop power control is used, said power value being increased by a determined constant value.
- 5. The method according to claim 1, wherein, when a call is established, a particular subscriber terminal signals to the base station that it will start a prioritized call.
- 6. The method according to claim 5, wherein if the power of the signal received by the base station from the particular subscriber terminal drops below a predetermined threshold, a higher transmit power is used in the prioritized call than in the other calls.
- 7. The method according to claim 1, wherein the level of the transmit power used in the prioritized call depends on the level of priority of the call.
- 8. The method according to claim 1, wherein the transmit power used in the prioritized call varies during the call.
- 9. The method according to claim 1, wherein the cellular network employs a CDMA multiple access method.
Priority Claims (1)
Number |
Date |
Country |
Kind |
940929 |
Feb 1994 |
FIX |
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Parent Case Info
This application claims benefit of International application PCT/FI95/00082, filed Feb. 17, 1995.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/FI95/00082 |
2/17/1996 |
|
|
8/19/1996 |
8/19/1995 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO95/24102 |
9/8/1995 |
|
|
US Referenced Citations (6)
Foreign Referenced Citations (5)
Number |
Date |
Country |
515 335 |
Nov 1992 |
EPX |
631 397 |
Dec 1994 |
EPX |
9307702 |
Apr 1993 |
WOX |
9317531 |
Sep 1993 |
WOX |
9400927 |
Jan 1994 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Hsu, Cherng-Shung et al., Multilevel Priority Scheme for Fiber-Optic Code Division Multiple Access (CDMA) Packet Networks, IEEE, pp. 1359-1366, 1993. |