# US 2011/0211620 A1 · Switching between transmit and receive modes in a wireless transceiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2011/0211620 A1 - Document ID: US20110211620A1 - Status: Published application - Kind: A1 - Application number: 12/714,153 - Filed: 2010-02-26 - Published: 2011-09-01 - Earliest claimed: 2010-02-26 - Assignees: Texas Instruments Incorporated - Inventors: Saurabh Khanna; Sarma Sundaresware Gunturi; Vijaya Sarathy Bergai ParthaSarathy - Web page: https://patentgrep.com/patent/US20110211620A1 ## CPC - H04B 1/46: by voice-frequency signals; by pilot signals - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0096: {Indication of changes in allocation} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A wireless transceiver decodes a receive signal to extract data contained in the receive signal. A processing block contained in the wireless transceiver then initiates a power-ON of the transmit radio portions of the transceiver prior to initiating a power-OFF of the receive radio portions. The technique enables the transceiver to meet timing requirements when operating in environments that require an acknowledgement to be sent in response to receipt of data. ## Claims ### Claim 1 A method implemented in a wireless transceiver, said wireless transceiver containing a first set of components in a receiver portion, and a second set of components in a transmitter portion, said method comprising: receiving a receive signal from a wireless medium; decoding said receive signal to extract data contained in said receive signal; and after said receiving, initiating a powering-ON of said second set of components prior to initiating a powering-OFF of said first set of components. ### Claim 2 (depends on 1) The method of claim 1, wherein said wireless transceiver is designed to operate according to a standard which requires an acknowledgement to be transmitted at the end of a fixed interval in response to, and after receiving, a receive signal, said method further comprising: transmitting after said powering-ON, an acknowledgment signal to said receive signal. ### Claim 3 (depends on 2) The method of claim 2, further comprising: generating, based on said decoding, a set of signals to indicate that said second set of components is to be powered-ON and said first set of components is to be powered OFF, wherein signals in said set of signals are generated to occur within a predetermined time interval of each other, wherein said generating is performed after determining whether said data extracted by said decoding represent valid data, and wherein said initiating is performed in response to said set of signals. ### Claim 4 (depends on 3) The method of claim 3, wherein said wireless transceiver is a WLAN transceiver operating according to IEEE 802.11 standards, and said time interval is a short inter-frame spacing (SIFS) interval. ### Claim 5 (depends on 4) The method of claim 4, wherein said first set of components are contained in a radio portion of said receiver portion, and said second set of components are contained in a radio portion of said transmitter portion. ### Claim 6 (depends on 5) The method of claim 5, wherein said initiating initiates power-ON of said second set of components and power-OFF of first set of components in an interleaved fashion. ### Claim 7 (depends on 4) The method of claim 4, wherein said initiating a powering-ON of said second set of components is performed in response to a first interrupt to a processing block, and said initiating a powering-OFF of said first set of components is performed in response to a second interrupt to said processing block, wherein said first interrupt and said second interrupt are not the same interrupt, wherein said first interrupt is designed to occur later than and within a pre-determined time interval of the occurrence of said second interrupt, said first interrupt set to have a higher priority than said second interrupt, wherein invocation of an interrupt service routine (ISR) corresponding to said first interrupt does not entail context save operations in said processing block. ### Claim 8 A wireless transceiver comprising: a transmit block; a receive block; and a first processing block to control provision of power to a radio portion of said transmit block and a radio portion of said receive block, wherein said receive block receives a receive signal from a wireless medium and decodes said receive signal to extract data contained in said receive signal, and wherein said first processing block initiates, after said receive block extracts said data, a power-ON of components in said radio portion of said transmit block prior to initiating a power-OFF of components in said radio portion of said receive block. ### Claim 9 (depends on 8) The wireless transceiver of claim 8, wherein said transmit block transmits an acknowledgement signal as a response to said receive signal at the end of a desired time interval starting from the end of said receive signal, said wireless transceiver further comprising a second processing block to determine whether said data represent valid data or not, wherein said second processing block initiates, after said receive block extracts said data, a power-ON of components in a baseband portion of said transmit block and a power-OFF of components in a baseband portion of said receive block, wherein said wireless transceiver is a WLAN transceiver operating according to IEEE 802.11 standards, and said time interval is a short inter-frame spacing (SIFS) interval. ### Claim 10 (depends on 9) The wireless transceiver of claim 9, wherein said first processing block is implemented as a finite state machine (FSM). ### Claim 11 (depends on 9) The wireless transceiver of claim 9, further comprising a state machine, wherein said state machine generates, if said data represent valid data, a set of signals to indicate that said radio portion and said baseband portion of said transmit block are to be powered-ON and said radio portion and said baseband portion of said receive block are to be powered OFF, wherein signals in said set of signals are generated to occur within a predetermined time interval of each other, wherein said first processing block initiates, in response to said set of signals, said power-ON and said power-OFF. ### Claim 12 (depends on 11) The wireless transceiver of claim 11, wherein said first processing block is a microprocessor, said set of signals containing a first signal and a second signal, said wireless transceiver further comprising an interrupt generation block, wherein said state machine provides each of said first signal and said second signal to said interrupt generation block, wherein said interrupt generation block generates an interrupt signal in response to transitions in said first signal and said second signal, and provides said interrupt signal to an interrupt input of said microprocessor, and wherein said microprocessor executes, in a single interrupt service routine (ISR), power-ON of said radio portion of said transmit block, and power-OFF of said radio portion of said receive block. ### Claim 13 (depends on 11) The wireless transceiver of claim 11, further comprising: a memory for storing instructions and data; an antenna to receive and to transmit signals on said wireless medium; and a switch to selectively couple an output of said transmit block and an input of said receive block to said antenna. ### Claim 14 A machine readable medium storing one or more sequences of instructions in a wireless transceiver containing a first set of components in a receiver portion, and a second set of components in a transmitter portion, wherein execution of said one or more sequences of instructions by one or more processors contained in said wireless transceiver causes said wireless transceiver to perform the actions of: receiving a receive signal from a wireless medium; decoding said receive signal to extract data contained in said receive signal; and after said receiving, initiating a powering-ON of said second set of components prior to powering-OFF of said first set of components. ### Claim 15 (depends on 14) The machine readable medium of claim 14, wherein said wireless transceiver is designed to operate according to a standard which requires an acknowledgement to be transmitted at the end of a fixed time interval in response to, and after receiving, a receive signal, said one or more sequences of instructions by one or more processors contained in said wireless transceiver to further cause said wireless transceiver to perform the action of: transmitting after said powering-ON, an acknowledgment signal to said receive signal, said transmitting being performed at the end of said fixed interval time interval, said fixed time interval starting from the end of said receive signal, said fixed time interval being specified by said standard. ### Claim 16 (depends on 15) The machine readable medium of claim 15, wherein said one or more processors contained in said wireless transceiver causes said wireless transceiver to perform powering-ON and powering OFF of said second set of components and said first set of components in a sequential manner. ### Claim 17 (depends on 16) The machine readable medium of claim 16, further comprising: generating, based on said decoding, a set of signals to indicate that said second set of components is to be powered-ON and said first set of components is to be powered OFF, wherein signals in said set of signals are generated to occur within a predetermined time interval of each other, wherein said generating is performed after determining whether said data extracted by said decoding represent valid data or not, and wherein said initiating is performed in response to said set of signals. ### Claim 18 (depends on 17) The machine readable medium of claim 17, wherein said wireless transceiver is a WLAN transceiver operating according to IEEE 802.11 standards, and said time interval is a short inter-frame spacing (SIFS) interval. ### Claim 19 (depends on 17) The machine readable medium of claim 17, wherein said first set of components are contained in a radio portion of said receiver portion, and said second set of components are contained in a radio portion of said transmitter portion. ### Claim 20 (depends on 17) The machine readable medium of claim 17, wherein said initiating a powering-ON of said second set of components is performed in response to a first interrupt to a processing block, and said initiating a powering-OFF of said first set of components is performed in response to a second interrupt to said processing block, wherein said first interrupt and said second interrupt are not the same interrupt, wherein said first interrupt is designed to occur coincident with or earlier than the occurrence of said second interrupt.