Controlling data transmission rate on the reverse link for each mobile station in a dedicated manner

• US 7,898,952 B2
• Filed: 02/26/2007
• Issued: 03/01/2011
• Est. Priority Date: 02/12/2001
• Status: Active Grant

• Current Assignee: 3G Licensing S.A. (Fineur International S.A.)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Young Jun, Lee, Young Jo, An, Jong Hoe, Kim, Young Cho, Kim, Ki Jun, Yun, Young Woo
• Primary Examiner(s): Bost; Dwayne D
• Assistant Examiner(s): Mehra; Inder P
• Application Number:
  US11/710,443
• Publication Number:
  US 20070171840A1
• Time in Patent Office: 1,464 Days
• Field of Search: 455/452.1, 455/69, 455/522, 455/63.1, 455/68, 370/335, 370/342, 370/441, 370/468, 370232-233, 370/235
• US Class Current: 370/232
• CPC Class Codes: H04W 28/22 Negotiating communication rate

Abstract

The data transmission rate on the reverse link in a mobile communications system is controlled by determining an interference level at a base station due to signals from all mobile stations served by the base station, and determining a transmission energy level required for each mobile station. The interference level is compared with the transmission energy level to obtain a comparison result for each mobile station, and each mobile adjusts its data transmission rate based upon the comparison result, which is sent via a common channel on a forward link to each mobile station in a dedicated manner. Thereafter, packet data is transmitted on the reverse link in accordance with the adjusting so that data throughput can be maximized.

Claims

1. A method, performed by a base station, for individually controlling data transmission for each of a plurality of mobile stations, the method comprising:

generating a data rate control command for each of the plurality of mobile stations based on a bit received from each of the plurality of mobile stations on a reverse packet data control channel, wherein each bit indicates whether the a corresponding mobile station itself has sufficient power margin on the reverse packet data channel; and

sending each data rate control command via a forward link channel in a dedicated manner to a corresponding one of the mobile stations to individually control the data transmission rate of each mobile station, wherein each data rate control command includes at least one rate control bit that is signal point mapped to three different symbols that indicate whether the corresponding mobile station will change or continue using its currently assigned data transmission rate.

2. The method of claim 1, wherein if a current data transmission rate of a particular mobile station is to be maintained, the rate control bit for the particular mobile station is mapped to a symbol of 0.

3. The method of claim 1, wherein each data rate control command is inserted into a corresponding bit position in a channel slot of the forward control channel.

4. The method of claim 1, wherein the bit that the base station receives from each mobile station indicates whether the a corresponding mobile station can transmit data in a next frame by increasing its data rate, wherein each bit is used in determining the data rate control command for a corresponding mobile station, and wherein each data rate control command indicates how a current data transmission rate of a respective mobile station is to be adjusted.

5. The method of claim 4, wherein the bit the base station receives from each mobile station is set as “

up”

if the transmission power margin of the corresponding mobile station is above a threshold and if the current data rate of the corresponding mobile station is below a maximum data rate;

otherwise, the bit is set as “

hold”

.

6. The method of claim 4, wherein each of the bits received from the mobile stations is set as “

up”

or “

hold”

based on at least one of a remaining power margin, a current transmission rate, and a number of bits within a transmission buffer for a corresponding one of the mobile stations.

7. The method of claim 1, wherein the data rate control command for a given one of the plurality of mobile stations is determined based on the bit received by the base station from the one mobile station, and wherein the bit indicates whether the one mobile station can transmit in a next frame by increasing its data rate.

8. The method of claim 7, wherein the data rate control command for the one mobile station is set as “

up”

when the bit received by the base station from the one mobile station is set as “

up”

.

9. The method of claim 1, wherein each bit further indicates the transmission buffer status in the corresponding mobile station.

10. A method of controlling a data transmission rate performed by a mobile station, the method comprising:

generating a bit based on the status of a transmission buffer in the mobile station, wherein the value of the bit indicates whether or not the mobile station has sufficient power margin to increase the current data transmission rate;

sending the bit on a reverse packet data control channel;

receiving a data rate control command from a base station on a forward link channel in a dedicated manner, wherein the data rate control command was generated at the base station based on the bit that was sent to the base station indicating whether the mobile station has sufficient power margin to increase the current data transmission rate, and wherein the data rate control command includes at least one rate control bit that is signal point mapped to three different symbols that indicate whether the mobile station should change or continue using its currently assigned data transmission rate; and

controlling the data transmission rate based on the received data rate control command.

11. The method of claim 10, wherein determining the value of the bit is further based on at least one of the mobile station'"'"'s transmission power margin, the mobile station'"'"'s current transmission data rate, and a number of available bits within the transmission buffer.

12. The method of claim 10, wherein the data rate control command is inserted into a corresponding bit position in a channel slot of the forward link control channel that is associated with the mobile station.

13. A base station for controlling data transmission rate on a reverse link in a mobile communications system that includes a plurality of mobile stations, the base station comprising:

a generator configured to generate a data rate control command for each of the plurality of mobile stations based on a bit received from each mobile station, respectively, on a reverse packet data control channel, wherein the bit received from each mobile station indicates whether or not the corresponding mobile station has sufficient power margin to increase its current data transmission rate, wherein each data rate control command includes at least one rate control bit for the corresponding mobile station, and wherein each of the least one rate control bits is signal point mapped to three different symbols that indicate whether the corresponding mobile station will change or continue using its currently assigned data transmission rate; and

a transceiver cooperating with the generator to send each data rate control command via a forward link channel in a dedicated manner to the corresponding mobile station.

14. The base station of claim 13, wherein if the current data transmission rate of a particular mobile station is to be maintained, then the at least one rate control bit for the particular mobile station is mapped to a symbol of 0.

15. The base station of claim 13 further comprising a signal point mapper to map the at least one rate control bit of each data rate control command to at least one symbol of +1, −

1, and 0.

16. The base station of claim 13 further comprising a multiplexer configured to insert the at least one rate control bit associated with each data rate control command into a certain bit position in a channel slot of the forward link channel that is associated with a corresponding mobile station.

17. A mobile station for controlling data transmission rate on a reverse link, the mobile station comprising:

a transmission buffer;

a generator configured to generate a bit based on the status of the transmission buffer, wherein the value of the bit indicates whether or not the mobile station has sufficient power margin to increase its current data transmission rate;

a transmitter configured to send the bit on a reverse packet data control channel;

a receiver configured to receive a data rate control command from a base station on a forward link channel in a dedicated manner, wherein the data rate control command was generated at the base station based on the bit that indicates whether or not the mobile station has sufficient power margin to increase its current data transmission rate, and wherein the data rate control command includes at least one rate control bit that is signal point mapped to three different symbols that indicate whether the mobile station will change or continue using its currently assigned data transmission rate; and

a controller cooperating with the receiver to control the data transmission rate based on the received data rate control command.

18. The mobile station of claim 17, wherein the controller determines the value of the bit based on at least one of the transmission power margin of the mobile station, the current data transmission rate of the mobile station, and the number of bits available within the transmission buffer.

19. The mobile station of claim 17, wherein the data rate control command is inserted into a corresponding bit position in a channel slot of the forward link channel that is associated with the mobile station.

20. A method of controlling a data transmission rate performed by a base station for a plurality of mobile stations, the method comprising:

receiving a bit from one of said mobile stations on a reverse packet data control channel, wherein the value of the bit indicates whether or not the mobile station has sufficient power margin to increase its current data transmission rate; and

transmitting, in a dedicated manner, a data rate control command to the mobile station on a forward link channel, wherein the data rate control command is based on the bit received from the mobile station indicating whether the mobile station has sufficient power margin, and wherein the data rate control command includes at least one rate control bit that is signal point mapped to three different symbols that indicate whether the one mobile station will change or continue using its currently assigned data transmission rate.

21. The method of claim 20, wherein the value of the bit received from the mobile station is based on at least one of the transmission power margin of the mobile station, a current data transmission rate of the mobile station and the number of available bits within a transmission buffer of the mobile station.

22. The method of claim 20, wherein the three different symbols, to which the at least one rate control bit is signal point mapped, respectively indicate whether the mobile station will increase, decrease or continue using its currently data transmission rate.

23. The base station of claim 20, wherein the data rate control command is inserted into a corresponding bit position in a channel slot of the forward link control channel that is associated with the mobile station.