# US 8,571,505 B2 · Methods and apparatus for controlling a gain state of a wireless receiver operating in an idle mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,571,505 B2 - Document ID: US8571505B2 - Status: Granted - Kind: B2 - Application number: 13/598,292 - Filed: 2012-08-29 - Published: 2012-12-20 - Granted: 2013-10-29 - Earliest claimed: 2005-02-24 - Assignees: BlackBerry Limited - Applicants: Xin Jin; Qingzhong Jiao; Tom Yun Sang Young - Inventors: Xin Jin; Qingzhong Jiao; Tom Yun Sang Young - Web page: https://patentgrep.com/patent/US8571505B2 ## CPC - H04W 52/0283: {with sequential power up or power down of successive circuit blocks, e.g. switching on the local oscillator before RF or mixer stages} - H03G 3/3052: {in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver (H03G3/32, H03G3/34 take precedence)} - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H03G: CONTROL OF AMPLIFICATION - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A technique for controlling operation of a communication subsystem is described. The subsystem is set to a first wake-up mode of operation, during which a state value from the system is read and stored in memory. The subsystem is then set to a sleep mode of operation after the first wake-up mode of operation, and to a second wake-up mode of operation after the sleep mode of operation. The stored state value is then read from the memory, where the subsystem is set to operate based on the read state value during a warm-up period of the second wake-up mode of operation. ## Claims ### Claim 1 A method for controlling operation of communication subsystem, the method comprising: setting the communication subsystem to a first wake-up mode of operation; reading a state value from the communication system during the first wake-up mode of operation and storing the state value in memory; setting the communication subsystem to a sleep mode of operation after the first wake-up mode of operation; setting the communication subsystem to a second wake-up mode of operation after the sleep mode of operation; and reading from the memory the stored state value, and setting the communication subsystem to operate based on the read state value during a warm-up period of the second wake-up mode of operation. ### Claim 2 (depends on 1) The method of claim 1, further comprising: after the warm-up period, setting the communication subsystem to operate based on a current state value of the communication subsystem in the second wake-up mode of operation after the warm-up period. ### Claim 3 (depends on 2) The method of claim 2, wherein the current state value is based on a detected signal level of a current signal received in the communication subsystem. ### Claim 4 (depends on 3) The method of claim 3, wherein the signal received in the communication subsystem comprises a radio frequency (RF) signal. ### Claim 5 (depends on 1) The method claim 1, further comprising: running a sleep mode timer for the sleep mode of operation; and in response to expiration of the sleep mode timer, setting the communication subsystem to the second wake-up mode of operation. ### Claim 6 (depends on 1) The method of claim 1, wherein the communication subsystem comprises a radio frequency (RF) receiver. ### Claim 7 (depends on 1) The method of claim 1, wherein the communication subsystem comprises a radio frequency (RF) receiver, and wherein the act of setting the communication subsystem to operate based on the stored state value comprises providing the stored state value to an amplifier of the RF receiver. ### Claim 8 (depends on 1) The method of claim 1, wherein the state value is one of a plurality of N state values. ### Claim 9 (depends on 1) The method of claim 1, wherein a communication device having the communication subsystem comprises a mobile station configured to operate in a wireless communication network. ### Claim 10 An electrical circuit, comprising: a processor; memory coupled to the processor; a communication subsystem coupled to the processor; a level detector configured to detect a signal level of a signal received in the communication subsystem; a state controller configured to provide one of a plurality of state values in response to the detected signal level from the level detector; the processor being configured to: set the communication subsystem to a first wake-up mode of operation; read a state value from the state controller during the first wake-up mode of operation and store the state value in the memory; set the communication subsystem to a sleep mode of operation after the first wake-up mode of operation; set the communication subsystem to a second wake-up mode of operation after the sleep mode of operation; and read from the memory the stored state value, and set the communication subsystem to operate based on the read state value during a warm-up period of the second wake-up mode of operation. ### Claim 11 (depends on 10) The electrical circuit of claim 10, wherein the processor is further configured to: after the warm-up period, set the communication subsystem to operate based on a current state value of the communication subsystem in the second wake-up mode of operation after the warm-up period. ### Claim 12 (depends on 11) The electrical circuit of claim 11, wherein the current state value is based on a current signal level from the level detector. ### Claim 13 (depends on 12) The electrical circuit of claim 12, wherein the signal comprises a radio frequency (RF) signal. ### Claim 14 (depends on 10) The electrical circuit of claim 10, wherein the processor is further configured to: run a sleep mode timer for the sleep mode of operation; and in response to expiration of the sleep mode timer, setting the communication subsystem to the second wake-up mode of operation. ### Claim 15 (depends on 10) The electrical circuit of claim 10, wherein the communication subsystem comprises a wireless receiver. ### Claim 16 (depends on 10) The electrical circuit of claim 10, wherein the communication subsystem comprises a wireless receiver, and wherein setting the communication subsystem to operate based on the stored state value comprises providing the stored state value to an amplifier of the wireless receiver. ### Claim 17 A communication device, comprising: a processor; memory coupled to the processor; a communication subsystem coupled to the processor; a level detector configured to detect a signal level of a signal received in the communication subsystem; a state controller configured to provide one of a plurality of state values in response to the detected signal level from the level detector; the processor being configured to: set the communication subsystem to a first wake-up mode of operation; read a state value from the state controller during the first wake-up mode of operation and store the state value in the memory; set the communication subsystem to a sleep mode of operation after the first wake-up mode of operation; set the communication subsystem to a second wake-up mode of operation after the sleep mode of operation; and read from the memory the stored state value, and set the communication subsystem to operate based on the read state value during a warm-up period of the second wake-up mode of operation. ### Claim 18 (depends on 17) The communication device of claim 17, wherein the processor is further configured to: after the warm-up period, set the communication subsystem to operate based on a current state value of the communication subsystem in the second wake-up mode of operation after the warm-up period. ### Claim 19 (depends on 18) The communication device of claim 18, wherein the current state value is based on a current signal level from the level detector. ### Claim 20 (depends on 19) The communication device of claim 19, wherein the signal comprises a radio frequency (RF) signal.