Method of controlling reverse transmission in a mobile communication system

A method of controlling a reverse data rate in a mobile station after receiving forward information commanding a reverse data rate change on a forward channel from a base station, the forward information indicating one of an increase, decrease, and maintenance of the reverse data rate, the method comprising the steps of:

• increasing, by the mobile station, the reverse data rate to be equal to or lower than a maximum data rate based on information indicating whether a data rate increase is available that is determined at a previous frame transmission if the forward information commands a conditional reverse data rate increase;
• and
• determining, by the mobile station, whether the increased data rate according to the received forward information is increasable for a next frame and transmitting the determination result to the base station.

A method of controlling a reverse data rate in a mobile station after receiving forward information commanding a reverse data rate change on a forward channel from a base station, the forward information indicating one of an increase, decrease, and maintenance of the reverse data rate, the method comprising the steps of:

• decreasing, by the mobile station, the reverse data rate to be equal to or higher than a minimum data rate based on information indicating whether a data rate increase is available that is determined at a previous frame transmission if the forward information commands a conditional data rate decrease;
• and
• determining, by the mobile station, whether the decreased data rate according to the received forward information is decreasable for a next frame and transmitting the determination result to the base station.

A method of controlling a reverse data rate in a mobile station after receiving forward information commanding a reverse data rate change on a forward channel from a base station, the forward information indicating one of an increase, decrease, and maintenance of the reverse data rate, the method comprising the steps of:

• maintaining, by the mobile station, the reverse data rate if the forward information commands an unconditional data rate maintenance;
• and
• determining, by the mobile station, whether the maintained reverse data rate according to the received forward information is maintainable for a next frame and transmitting the determination result to the base station.

A method of controlling the data rate of a mobile station in a base station comprising the steps of:

• determining, by the mobile station, an extended reverse activity bit (RAB) based on reverse information received from the mobile station indicating whether a reverse data rate increase is available for a next reverse frame and a current capacity of a reverse link and transmitting the extended RAB to the mobile station, the RAB indicating one of an increase, decrease, and maintenance of the reverse data rate.

A mobile station device for controlling a reverse data rate after receiving forward information commanding a reverse data rate change on a forward channel from a base station, the forward information indicating one of an increase, decrease, and maintenance of the reverse data rate, the device comprising:

• an apparatus for increasing the reverse data rate to equal to or lower than a maximum data rate if the forward information commands a reverse data rate increase, increasing the reverse data rate to equal to or lower than the maximum data rate based on information determined at a previous frame transmission indicating whether a data rate increase is available if the forward information commands a conditional reverse data rate increase, decreasing the reverse data rate to equal to or higher than a minimum data rate based on the information determined at the previous frame transmission indicating whether a data rate increase is available if the forward information commands a conditional reverse data rate decrease, maintaining the reverse data rate if the forward information commands an unconditional data rate maintenance, and determining whether the changed or maintained reverse data rate can be increased for a next frame;
• and
• an apparatus for transmitting the determination result to the base station.

A base station device for controlling a data rate of a mobile station comprising:

• an apparatus for determining an extended reverse activity bit (RAB) based on reverse information received from the mobile station indicating whether a reverse data rate increase is available for a next reverse frame and a current capacity of a reverse link, the RAB indicating one of an increase, decrease, and maintenance of the reverse data rate;
• and
• an apparatus for transmitting the extended RAB to the mobile station.