Method, mobile station and base station for establishing connections in a radiocommunications system

• US 8,229,489 B1
• Filed: 10/26/1998
• Issued: 07/24/2012
• Est. Priority Date: 10/27/1997
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Klein, Anja, Färber, Michael, Lüders, Christian
• Primary Examiner(s): Nguyen, Tu X
• Application Number:
  US09/530,386
• Time in Patent Office: 5,020 Days
• Field of Search: 455/69, 455/522, 455/561, 455/13.4, 455/502, 455/67.11, 370/229, 370/331, 370/468, 370/230, 370/228, 370/335, 370/336, 370/321, 370/324
• US Class Current: 455/522
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A radio communication system, for example a TDMA/CDMA radio communication system, has at least one base station recurringly offering frequency channels for a random access for mobile stations in an upstream direction. The mobile station that requests a connection setup measures a reception power of a signal sent in a downstream direction by the base station and sets a transmission power for sending an access radio block to the base station dependent on the measured reception power. A variable transmission power control can thus be implemented at the mobile station side with the assistance of the measured reception power of the signal transmitted on the part of the base station, being also capable of being implemented for random access of the mobile stations, this having previously always occurred with maximum transmission power.

Claims

1. A method for connection setup for mobile stations of a radio communication system having at least one base station, comprising:

recurrently offering frequency channels for a random access in an upstream direction for the mobile stations;

in the mobile station that requests a connection setup, measuring a reception power of a signal sent from the base station in a downstream direction;

sending, from the base station to the mobile station, information about base station transmission power in the downstream direction; and

in the mobile station, setting a mobile station transmission power, dependent on the measured reception power and the information about the base station transmission power, for sending an access radio block to the base station,

wherein if the access radio block, sent to the base station, has not been successfully detected by the base station, a new access radio block is sent by the mobile station with increased power, and

wherein the signal transmitted in the downstream direction is a pilot signal.

2. The method according to claim 1, wherein the radio communication system is configured as a TDMA/CDMA radio communication system, a plurality of connections between the mobile frequency channels information of different connections can be distinguished from one another according to a connection-individual code, whereby information is simultaneously transmitted between stations and the base station in time slots based on the information of the codes used to separate information of different connections.

3. The method according to claim 2, wherein the information of different connections are spread with the individual codes.

4. The method according to claim 1, wherein the mobile station sets the mobile station transmission power all the higher the lower the measured reception power is.

5. The method according to claim 1, wherein another signal transmitted in the downstream direction is a training sequence signal.

6. The method according to claim 1 wherein another signal transmitted in the downstream direction is a data signal.

7. The method according to claim 1, wherein the mobile station estimates a radio field attenuation in the downstream direction on the basis of the measured reception power and sets the mobile station transmission power such that the radio field attenuation is partially compensated.

8. The method according to claim 7, wherein the mobile station sets the mobile station transmission power such that the radio field attenuation is completely compensated.

9. The method according to claim 1, wherein a broadband frequency range is divided into sub-ranges having a narrower bandwidth within a frequency channel for the random access, the mobile station that requests the connection setup selecting a sub-range within said frequency channel, and the mobile station sending the access radio block to the base station in this sub-range.

10. The method according to claim 1, wherein the access radio block is not spread.

11. The method according to claim 1, wherein the access radio block is spread with an individual code.

12. A mobile station to which a connection setup is to be provided in a radio communication system having at least one base station, and wherein frequency channels are recurrently offered for a random access in an upstream direction for the mobile station, comprising:

a measuring unit for measuring a reception power of a signal sent from the base station in a downstream direction when the mobile station requests a connection setup;

a transmission power setting unit which, dependent on measured reception power, sends an access radio block to the base station;

a receiving unit receiving information about base station transmission power used by the base station in the downstream direction; and

a control panel for triggering the random access,

wherein said measuring unit comprises a signal processing unit for measuring the reception power of the signal sent in the downstream direction from the base station and for generating the access radio block,

wherein said transmission power setting unit comprises a control unit for setting the transmission power for the transmission of the access radio block to the base station dependent on the measured reception power and the information about the base station transmission power,

wherein if the access radio block, sent to the base station, has not been successfully detected by the base station, a new access radio block is sent by the mobile station with increased power, and

wherein the signal transmitted in the downstream direction is a pilot signal.

13. A base station in a radio communication system wherein a connection setup occurs from mobile stations, and wherein the mobile station that requests a connection setup measures a reception power of a signal sent from the base station in a downstream direction, and wherein the mobile station sets a transmission power dependent on the measured reception power for sending an access radio block to the base station, comprising:

a unit for recurrently offering frequency channels for a random access in an upstream direction for the mobile stations;

a signal processing unit for generating the signal to be transmitted in the downstream direction; and

a control unit for setting a transmission power for sending the signal to the mobile station that requests the connection setup,

wherein if the access radio block, sent to the base station, has not been successfully detected by the base station, a new access radio block is sent by the mobile station with increased power,

wherein the signal transmitted in the downstream direction is a pilot signal, and

wherein information about base station transmission power used by the base station in the downstream direction is sent from the base station to the mobile station and is employed by the mobile station for setting the transmission power.

14. A mobile station for transmission of data, block-by-block, to a base station on frequency channels, which are recurrently offered for random access, comprising:

a measuring unit for measuring a reception power of a broadcast signal transmitted by the base station, the broadcast signal being selected from the group consisting of a training sequence signal, a data sequence signal, a pilot signal and a control signal;

a transmitter to send an access radio block to the base station without a frequency channel having been previously allocated to the mobile station, the access block requesting a connection setup with the base station, the transmitter transmitting the access block to the base station on a random access channel;

a receiving unit to receive information about base station transmission power used by the base station in the downstream direction; and

a power limiter to limit a transmission power of the access radio block before transmission of the access radio block, based on the information about the base station transmission power and the reception power of the broadcast signal transmitted by the base station, such that the transmission power is reduced for a larger reception power and the transmission power is increased for a lower reception power,

wherein if the access radio block, sent to the base station, has not been successfully detected by the base station, a new access radio block is sent by the mobile station with increased power.