Method for regulating the transmitter power in a radio system and corresponding radio system

• US 7,813,704 B1
• Filed: 04/03/2000
• Issued: 10/12/2010
• Est. Priority Date: 04/22/1999
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Raaf, Bernhard
• Primary Examiner(s): Kincaid; Lester
• Assistant Examiner(s): SAMS, MATTHEW C
• Application Number:
  US10/009,858
• Time in Patent Office: 3,844 Days
• Field of Search: 340/7.32, 340/7.37, 340/425.2, 340/855.8, 370/318, 379/395.01, 455/13.4, 455/522, 455/127.1, 455/69
• US Class Current: 455/69
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

In a radio system, in particular a CDMA mobile radio system, a receiver evaluates a signal received from a transmitter and produces power control information for setting the transmission power as a function of this evaluation. In order to improve the transmission reliability of the power control information, it is coded, and is transmitted to the transmitter, together with further data from the said timeslot, for example with bits from the format identification information.

Claims

1. A method for controlling the transmission power in a radio system, the method comprising the steps of:

evaluating a signal received by a receiver via a transmission channel of the radio system from a transmitter;

producing power control information as a function of the signal;

embedding the power control information in a timeslot structure together with further data to be transmitted in the same timeslot to said transmitter

coding, in the receiver, the power control information in one time slot in a manner where the power control information is coded, with the addition of redundancy, together with the further data to be transmitted in the same time slot to form a common data word, with at least one bit value in the data word depending on the power control information and on the further data; and

transmitting the coded power control information in one timeslot to the transmitter, together with the further data to be transmitted in the same time slot; and

setting, in the transmitter, the transmission power as a function of the transmitted coded power control information.

2. A method for controlling the transmission power in a radio system as claimed in claim 1, wherein the further data is data for format identification information.

3. A method for controlling the transmission power in a radio system as claimed in claim 1, wherein the further data is user data.

4. A method for controlling the transmission power in a radio system as claimed in claim 1, wherein the power control information is transmitted in binary form.

5. A method for controlling the transmission power in a radio system as claimed in claim 4, wherein bits in the power control information are coded with bits of the further data to form a common binary data word.

6. A method for controlling the transmission power in a radio system as claimed in claim 5, wherein the coded data word comprises a plurality of bits corresponding to a sum of the bits in the power control information and the bits in the further data.

7. A method for controlling the transmission power in a radio system as claimed in claim 5, wherein, during the coding process, at least one bit in the coded data word is assigned a value of the power control information to be transmitted in the corresponding time slot.

8. A method for controlling the transmission power in a radio system as claimed in claim 5, wherein, during the coding process, at least one bit in the coded data word is assigned a value of the power control information to be transmitted in the corresponding time slot from the further data.

9. A method for controlling the transmission power in a radio system as claimed in claim 1, wherein during the coding process, at least one bit in the coded data word is assigned a value which corresponds to a logic operation between the power control information to be transmitted in the corresponding time slot and the information to be transmitted in the same time slot from the further data, and a logic exclusive-OR operation is used as the logic operation.

10. A method for controlling the transmission power in a radio system as claimed in claim 1, the method further comprising the step of:

recovering the power control information in the transmitter via appropriate decoding, with an estimated value being determined for the power control information during the decoding process based on the value obtained by the logic operation from the corresponding bit in the coded data word.

11. A method for controlling the transmission power in a radio system as claimed in claim 1, wherein the receiver which produces the coded power control information is a base station in a mobile radio system, and the transmitter which received the power control information and sets its transmission level appropriately is a mobile station in the mobile radio system, such that the coded power control information is transmitted via a downlink connection between the receiver and the transmitter.

12. A radio system, comprising:

a transmitter; and

a receiver for receiving a signal from the transmitter, which is transmitted via a transmission channel of the mobile radio system, wherein the receiver;

evaluates the signal;

produces power control information as a function of the signal;

embeds the power control information in a timeslot structure together with further data to be transmitted in the same timeslot to said transmitter;

codes the power control information in a one time slot in a manner where the power control information is coded, with the addition of redundancy, together with the further data to be transmitted in the same time slot to form a common data word, with at least one bit value in the data word depending on the power control information and on the further data; and

transmits the coded power control information in one timeslot to the transmitter, together with the further data to be transmitted in the same time slot,

and wherein the transmitter sets the transmission power as a function of the transmitted coded power control information.

13. A radio system as claimed in claim 12, wherein the receiver codes the power control information together with data from format identification information for the same time slot.

14. A radio system as claimed in claim 12, wherein the receiver send the power control information to the transmitter in a binary form.

15. A radio system as claimed in claim 14, wherein the receiver codes bits in the power control information together with bits in the further data to form a common binary data word.

16. A radio system as claimed in claim 15, wherein the receiver, during the coding process, assigns at least one bit in the coded common data word a value of the power control information to be transmitted in the corresponding time slot.

17. A radio system as claimed in claim 15, wherein the receiver, during the coding process, assigns at least one bit in the coded common data word a value of the power control information to be transmitted in the corresponding time slot from the further data.

18. A radio system as claimed in claim 12, wherein the logic operation carried out by the receiver during the coding process is a logic exclusive-OR operation.

19. A radio system as claimed in claim 12, wherein the transmitter, after receiving the coded common data word, recovers the power control information via appropriate decoding and determines an estimated value for the power control information based on the value obtained by the logic operation form the corresponding bit in the coded common data word.

20. A radio system as claimed in claim 12, wherein the radio system is a CDMA mobile radio system.

21. A radio system as claimed in claim 20, wherein the receiver which produces the coded binary power control information is a base station in the mobile radio system, and the transmitter which receives the power control information and sets its transmission power appropriately is a mobile station in the mobile radio system.