Method and system for controlling reverse link rate in CDMA 1xEV-DO mobile communication system

A method for controlling a reverse link rate by using a cell self-interference rate in a CDMA 1xEV-DO mobile communication system, comprising the steps of:

• (a) measuring a value of rise-over-thermal (ROT) at each antenna end of a wireless base station to obtain a measured ROT value;
• (b) comparing the measured ROT value with a threshold ROT which defines an allowable limit of the ROT;
• (c) setting a reverse activation control bit as 0 to be transmitted to a mobile terminal if the comparison result in step (b) reveals that the measured ROT value is smaller than or equal to the threshold ROT;
• (d) comparing the cell self-interference rate with a threshold interference rate which defines an allowable limit of the cell self-interference rate if the comparison result in step (b) reveals that the measured ROT value is greater than the threshold ROT;
• (e) setting the reverse activation control bit as 0 to be transmitted to the mobile terminal if the comparison result in step (d) reveals that the cell self-interference rate is smaller than or equal to the threshold interference rate;
• (f) setting the reverse activation control bit as 1 to be transmitted to the mobile terminal if the comparison result in step (d) reveals that the cell self-interference rate is greater than the threshold interference rate;
• and
• (g) setting the reverse activation control bit as 1 to be transmitted to the mobile terminal if a number of the active users is greater than a threshold user number.

A method for controlling a reverse link rate in a CDMA 1xEV-DO mobile communication system, comprising the steps of:

• (a) measuring a value of rise-over-thermal (ROT) at each antenna end of a wireless base station to obtain a measured ROT value;
• (b) comparing the measured ROT value with a threshold ROT which defines an allowable limit of the ROT;
• (c) setting a reverse activation control bit as 0 to be transmitted to a mobile terminal if the comparison result in step (b) reveals that the measured ROT value is smaller than or equal to the threshold ROT;
• (d) comparing the number of active users who are carrying out communication with a threshold user number which defines an allowable limit of the active users and comparing a cell self-interference rate with a threshold interference rate which defines an allowable limit of the cell self-interference rate if the comparison result in step (b) reveals that the measured ROT value is greater than the threshold ROT;
• (e) setting the reverse activation control bit as 0 to be transmitted to the mobile terminal if the comparison result in step (d) reveals that the number of the active users and the cell self-interference rate are smaller than or equal to the threshold user number and the threshold interference rate, respectively;
• and
• (f) setting the reverse activation control bit as 1 to be transmitted to the mobile terminal if the comparison result in step (d) reveals that the number of the active users is greater than the threshold user number or the cell self-interference rate is greater than the threshold interference rate.

A system for controlling a reverse link rate in a CDMA 1xEV-DO mobile communication system, comprising:

• at least one mobile terminal capable of transceiving packet data with the reverse link rate changed based on a reverse activation control bit to be received;
• a radio access network for measuring a value of rise-over-thermal (ROT) of the system to obtain a measured ROT value, determining the reverse activation control bit by using at least one of the measured ROT value, the number of active users who are carrying out communication and a cell self-interference rate and transmitting the reverse activation control bit to control the reverse link rate;
• and
• a mobile switching center connected to the radio access network for performing incoming and outgoing call process of the mobile terminal and also connected to be linked with a data communication network;
• wherein the reverse activation control bit is set to have a value of 0 if the measured ROT value is greater than a threshold ROT which represents an allowable limit of the ROT but the number of the active users and the cell self-interference rate are smaller than or equal to a threshold user number which represents an allowable limit of the active user and a threshold interference rate which represents an allowable limit of the cell self-interference rate, respectively.