# US 7,609,635 B2 · Method of controlling reverse transmission in a mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,635 B2 - Document ID: US7609635B2 - Status: Granted - Kind: B2 - Application number: 10/109,740 - Filed: 2002-03-29 - Published: 2002-12-05 - Granted: 2009-10-27 - Earliest claimed: 2001-03-29 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Beom-Sik Bae; Dong-Seek Park; Chang-Hoi Koo; Dae-Gyun Kim - Web page: https://patentgrep.com/patent/US7609635B2 ## CPC - H04L 1/0002: {by adapting the transmission rate} - H04L 1/0015: {characterised by the adaptation strategy} - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0033: {arrangements specific to the transmitter} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 43/0894: Packet rate - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A reverse transmission controlling method in a mobile communication system. After receiving forward information commanding a reverse data rate change on a forward channel from a base station, a mobile station increases its reverse data rate to a data rate equal to or lower than a maximum data rate if the forward information commands a reverse data rate increase, determines whether the increased data rate can be further increased for the next frame, and transmits the determination result with information representing the increased data rate to the base station. ## Claims ### Claim 1 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 if the forward information commands a 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the forward information is an extended reverse activity bit (RAB). ### Claim 3 (depends on 2) The method of claim 2, wherein if the forward information is received from at least two base stations, a control RAB is generated from extended RABs received from the base stations, and a change in the reverse data rate is determined based on the control RAB. ### Claim 4 (depends on 3) The method of claim 3, wherein: if at least one of the extended RABs indicates a conditional decrease, the control RAB is set to indicate the conditional decrease; if none of the extended RABs indicate the conditional decrease and at least one of the extended RABs indicates an unconditional data rate maintenance, the control RAB is set to indicate the unconditional data rate maintenance; if none of the extended RABs indicate either the conditional decrease or the unconditional data rate maintenance and at least one of the extended RABs indicates a conditional increase, the control RAB is set to indicate the conditional increase; and if all the extended RABs indicate an unconditional increase, the control RAB is set to indicate the unconditional increase. ### Claim 5 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. ### Claim 6 (depends on 5) The method of claim 5, wherein the forward information is an extended reverse activity bit (RAB). ### Claim 7 (depends on 6) The method of claim 6, wherein if the forward information is received from at least two base stations, a control RAB is generated from extended RABs received from the base stations and a change in the reverse data rate is determined based on the control RAB. ### Claim 8 (depends on 7) The method of claim 7, wherein: if at least one of the extended RABs indicates a conditional decrease, the control RAB is set to indicate the conditional decrease; if none of the extended RABs indicate the conditional decrease and at least one of the extended RABs indicates an unconditional data rate maintenance, the control RAB is set to indicate the unconditional data rate maintenance; if none of the extended RABs indicate either the conditional decrease or the unconditional data rate maintenance and at least one of the extended RABs indicates a conditional increase, the control RAB is set to indicate the conditional increase; and if all the extended RABs indicate an unconditional increase, the control RAB is set to indicate the unconditional increase. ### Claim 9 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. ### Claim 10 (depends on 9) The method of claim 9, wherein the forward information is an extended reverse activity bit (RAB). ### Claim 11 (depends on 10) The method of claim 10, wherein if the forward information is received from at least two base stations, a control RAB is generated from extended RABs received from the base stations and a change in the reverse data rate is determined based on the control RAB. ### Claim 12 (depends on 11) The method of claim 11, wherein: if at least one of the extended RABs indicates a conditional decrease, the control RAB is set to indicate the conditional decrease; if none of the extended RABs indicate the conditional decrease and at least one of the extended RABs indicates an unconditional data rate maintenance, the control RAB is set to indicate the unconditional data rate maintenance; if none of the extended RABs indicate either the conditional decrease or the unconditional data rate maintenance and at least one of the extended RABs indicates a conditional increase, the control RAB is set to indicate the conditional increase; and if all the extended RABs indicate an unconditional increase, the control RAB is set to indicate the unconditional increase. ### Claim 13 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. ### Claim 14 (depends on 13) The method of claim 13, wherein the forward information is an extended reverse activity bit (RAB). ### Claim 15 (depends on 14) The method of claim 14, wherein if the forward information is received from at least two base stations, a control RAB is generated from extended RABs received from the base stations and a change in the reverse data rate is determined based on the control RAB. ### Claim 16 (depends on 15) The method of claim 15, wherein: if at least one of the extended RABs indicates a conditional decrease, the control RAB is set to indicate the conditional decrease; if none of the extended RABs indicate the conditional decrease and at least one of the extended RABs indicates an unconditional data rate maintenance, the control RAB is set to indicate the unconditional data rate maintenance; if none of the extended RABs indicate either the conditional decrease or the unconditional data rate maintenance and at least one of the extended RABs indicates a conditional increase, the control RAB is set to indicate the conditional increase; and if all the extended RABs indicate an unconditional increase, the control RAB is set to indicate the unconditional increase. ### Claim 17 (depends on 13) The method of claim 13, wherein if it is determined at a frame transmission before the forward information is received that a reverse data rate increase is not available, no determination is made as to whether the maintained reverse data rate can be increased for the next frame and a value which the reverse data rate is not available at the previous frame transmission is transmitted to the base station. ### Claim 18 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. ### Claim 19 (depends on 18) The method of claim 18, wherein: if the reverse link is in an overload state, the extended RAB is set to indicate a conditional data rate decrease; if an increase in the data rates of all mobile stations within a coverage area of the base station does not cause an overload on the reverse link, the extended RAB is set to indicate an unconditional data rate increase; if the reverse link is not in an overload state and can accommodate the increase in the data rates of all the mobile stations, the extended RAB is set to indicate a conditional data rate increase; and if the reverse link is not in the overload state and cannot accommodate the increase in the data rates of all the mobile stations, the extended RAB is set to indicate an unconditional data rate maintenance. ### Claim 20 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. ### Claim 21 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.