Apparatus and method for controlling a reverse traffic rate in a mobile communication system

• US 7,512,153 B2
• Filed: 05/10/2004
• Issued: 03/31/2009
• Est. Priority Date: 05/10/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Koo, Chang-Hoi, Kim, Dae-Gyun, Kim, Youn-Sun, Kim, Dong-Hee, Kwon, Hwan-Joon, Jung, Jung-Soo, Bae, Beom-Sik
• Primary Examiner(s): LY, ANH VU H
• Application Number:
  US10/842,332
• Publication Number:
  US 20040223474A1
• Time in Patent Office: 1,786 Days
• Field of Search: None
• US Class Current: 370/468
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

A system and method for controlling data rates of a reverse packet data in mobile communication system for transmitting reverse packet data from a mobile station to a base station over a reverse packet data channel at a plurality of data rates. The present invention provides an apparatus and method for improving throughput of an entire system by enabling a base station'"'"'s scheduler to rapidly assign reverse resource for a mobile station that has completed its data transmission to other mobile stations.

Claims

1. A method for determining a data rate of reverse packet data by a mobile station, in a mobile communication system for transmitting the reverse packet data from the mobile station to a base station, the method comprising the steps of:

receiving information related to a data rate and identifier information of the mobile station, transmitted from the base station over a first channel;

receiving data rate change information from the base station over a second channel;

if the identifier information received over the first channel is identical to identifier information of the mobile station, transmitting the reverse packet data using the information related to the data rate received over the first channel; and

if the identifier information received over the first channel is not identical to the identifier information of the mobile station, transmitting the reverse packet data at a data rate determined based on the data rate change information.

2. The method of claim 1, wherein the data rate change information includes information related to one of an increase of one step, a hold, and a decrease of one step, from the data rate of previous reverse packet data channel.

3. The method of claim 1, wherein the first channel is a forward scheduling channel (F-SCH).

4. The method of claim 1, wherein the first channel is a forward grant channel (F-GCH).

5. The method of claim 1, wherein the second channel is a forward common rate control channel (F-RCCH).

6. The method of claim 1, wherein the identifier information is a medium access control identifier (MAC ID).

7. The method of claim 1, further comprising the step of transmitting information related to a presence of transmission packet data over a reverse request channel (R-REQCH) of a reverse traffic channel if there is transmission packet data.

8. The method of claim 1, further comprising the step of transmitting status information of the mobile station over a reverse packet data control channel (R-PDCCH).

9. An apparatus configured to determine a data rate of reverse packet data for a mobile station in a mobile communication system for transmitting the reverse packet data from the mobile station to a base station, the apparatus comprising:

a first channel receiver for receiving information related to a data rate and identifier information of the mobile station, transmitted from the base station over a first channel;

a second channel receiver for receiving data rate change information from the base station over a second channel; and

a rate controller for transmitting the reverse packet data using the information related to the data rate, if the identifier information received over the first channel is identical to unique identifier information of the mobile station, and transmitting the reverse packet data at a data rate determined based on the data rate change information received over the second channel, if the identifier information received over the first channel is not identical to the unique identifier information of the mobile station.

10. The apparatus of claim 9, wherein the data rate change information is information related to one of an increase of one step, a hold, and a decrease of one step, from a data rate of previous reverse packet data.

11. The apparatus of claim 9, wherein the first channel is a forward grant channel (F-GCH).

12. The apparatus of claim 9, wherein the second channel is a forward common rate control (F-RCCH).

13. The apparatus of claim 9, wherein the identifier information is a medium access control identifier (MAC ID).

14. The apparatus of claim 9, further comprising a transmitter for transmitting data rate request information for a reverse traffic channel when there is transmission packet data.

15. The apparatus of claim 9, further comprising a transmitter for transmitting status information of the mobile station.

16. A method for controlling data rates of a reverse packet data channel by a mobile station in a mobile communication system for transmitting reverse packet data over the reverse packet data channel at one of a plurality of data rates, the method comprising the steps of:

receiving scheduled data rate information and identifier information of the mobile station from a base station over a first channel;

receiving step-by-step data rate information related to a change in a data rate from a data rate of a previous reverse packet data channel, from the base station over a second channel;

if the identifier information is identical to identifier information of the mobile station, transmitting reverse packet data at the scheduled data rate received over the first channel; and

if the identifier information is not identical to identifier information of the mobile station, transmitting reverse packet data at a data rate determined based on the step-by-step data rate information received over the second channel.

17. The method of claim 16, further comprising the steps of:

if there is data to be transmitted at a next transmission time, determining a maximum data rate according to transmission power assignable to the reverse packet data channel and an amount of data that can be transmitted over the reverse packet data channel; and

transmitting the determined maximum data rate and a scheduling request message over a first reverse channel together with the packet data channel.

18. The method of claim 16, wherein the step-by-step data rate information includes information related to one of an increase of one step, a hold, and a decrease of one step, from the previous reverse packet data rate.

19. The method of claim 16, wherein the first channel is a forward scheduling channel (F-SCH).

20. The method of claim 16, wherein the first channel is a forward grant channel (F-GCH).

21. The method of claim 16, wherein the second channel is a forward common rate control channel (F-RCCH).

22. The method of claim 16, wherein if there is data to be transmitted at a next transmission time, the mobile station determines the possible maximum reverse data rate only when the currently set reverse data rate is a low data rate falling within a predetermined scope, when there is reverse transmission data, and when there is sufficient power to be assigned to a reverse traffic channel, and transmits a scheduling request message over the reverse traffic channel.

23. The method of claim 22, further comprising the steps of:

generating a message for requesting the step-by-step data rate determination when the currently set reverse data rate is not the low data rate falling within the predetermined scope or transmission power to be assigned to the reverse traffic channel is not sufficient; and

transmitting the generated message over the reverse traffic channel.

24. The method of claim 16, further comprising the step of transmitting information related to an absence of data in a buffer over a first reverse channel, if there is no data to be transmitted over a reverse traffic channel at a next transmission time.

25. The method of claim 24, further comprising the step of suspending transmission of reverse traffic starting at a time when the information related to the absence of data in the buffer is transmitted over the first reverse channel.

26. An apparatus for controlling data rates of a reverse packet data channel of a mobile station, by a base station in a mobile communication system for transmitting reverse packet data over the reverse packet data channel at one of a plurality of data rates, the apparatus comprising:

a scheduler for receiving status information of the mobile station from the mobile station, determining a reverse data rate assignable to the mobile station using the status information of the mobile station and channel information assignable to a reverse link; and

a channel transmitter for transmitting information on the reverse data rate determined by the scheduler and identifier information of the mobile station, to the mobile station over a predetermined channel;

wherein the channel transmitter comprises;

a frame quality indicator adder for adding an error correction code to the information on the reverse data rate determined by the scheduler and the identifier information of the mobile station;

a tail bit adder for adding tail bits to the error correction code-added information to converge the error correction code-added information into a particular state;

a convolutional encoder for channel-encoding the tail bit-added information;

a block interleaver for block-interleaving the channel-encoded information; and

a modulator for modulating the block-interleaved information.

27. An apparatus for transmitting a data rate request for a reverse packet data channel from a mobile station to a base station, in a mobile communication system for transmitting reverse packet data over the reverse packet data channel at one of a plurality of data rates, the apparatus comprising:

a controller for calculating possible maximum data rate information according to a data rate of a current reverse packet data channel of the mobile station and power capacity of the mobile station, and generating a reverse data rate request message including the calculated data rate information; and

a channel transmitter for transmitting the reverse data rate request message generated by the controller over a predetermined reverse channel;

wherein the channel transmitter comprises;

a frame quality indicator adder for adding an error correction code to information on the reverse data rate determined by the controller and identifier information of the mobile station;

a tail bit adder for adding tail bits to the error correction code-added information to converge the error correction code-added information into a particular state;

a convolutional encoder for channel-encoding the tail bit-added information;

a block interleaver for block-interleaving the channel-encoded information; and

a modulator for modulating the block-interleaved information.