# US 2013/0155931 A1 · Time domain coexistence of rf signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155931 A1 - Document ID: US20130155931A1 - Status: Published application - Kind: A1 - Application number: 13/716,540 - Filed: 2012-12-17 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: Broadcom Corporation - Inventors: Sudhir Prajapati; Payel Banerjee; Asish M R; Kashiviswanath N; Sachin Gupta; Sanjay Saha; Neeraj Poojary; Yury Gonikberg; Mark Gonikberg; Matthew Fischer; Kamesh Medapalli; Florin Baboescu; Steven Hall; Shawn Ding; Prasanna Desai; Knut Odman - Web page: https://patentgrep.com/patent/US20130155931A1 ## CPC - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04B 15/00: Suppression or limitation of noise or interference (by means associated with receiver H04B1/10) - H04W 16/04: Traffic adaptive resource partitioning - H04W 52/0209: {in terminal devices} - H04W 72/044: based on the type of the allocated resource - H04W 74/04: Scheduled access (hybrid access H04W74/02) - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/1215: {for collaboration of different radio technologies} - H04W 88/04: adapted for relaying to or from another terminal or user - 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) - H04B: TRANSMISSION - 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 Various methods and systems are provided for time domain coexistence of RF signals. In one example, among others, a method includes obtaining access to a WLAN channel during a free period of a coexisting cellular connection, providing a RDG to allow another device to transmit for a duration corresponding to at least a portion of a TXOP, and receiving a transmission during the duration. In another example, a method includes obtaining access to a WLAN channel during a transmission period of a coexisting cellular connection and providing a protection frame to defer transmissions from another device for a duration corresponding to at least a portion of a TXOP. In another example, a method includes determining a shift of a BT transaction based at least in part upon a schedule of cellular communications and shifting at least a portion of the BT transaction based upon the determined shift. ## Claims ### Claim 1 A method, comprising: obtaining, by a communication device supporting coexisting wireless local area network (WLAN) and cellular communications, contention free access to a WLAN channel during a traffic free period of a coexisting cellular connection; providing, by the communication device, a reverse direction grant (RDG) to another device of the WLAN allowing the other device to transmit over the WLAN channel for a duration corresponding to at least a portion of a transmit opportunity (TXOP) of the traffic free period of the coexisting cellular connection; and receiving, by the communication device, a transmission from the other device of the WLAN for at least a portion of the duration. ### Claim 2 (depends on 1) The method of claim 1, wherein the communication device is acting as a soft access point of the WLAN and the other device of the WLAN is a client station (STA). ### Claim 3 (depends on 2) The method of claim 2, further comprising: providing, by the communication device, an acknowledgement (ACK) of the transmission from the other device of the WLAN; and providing, by the communication device, another RDG to another STA of the WLAN allowing the other STA to transmit over the WLAN channel for a second duration corresponding to a remaining portion of the TXOP of the traffic free period of the coexisting cellular connection. ### Claim 4 (depends on 2) The method of claim 2, further comprising: providing, by the communication device, an acknowledgement (ACK) of the transmission from the other device of the WLAN; and providing, by the communication device, a clear-to-send to self (CTS2self) frame to STAs of the WLAN to defer transmissions from the STAs of the WLAN to the communication device for a duration specified in the CTS2self frame. ### Claim 5 (depends on 1) The method of claim 1, wherein the communication device is acting as a client station (STA) and the other device of the WLAN is an access point (AP) of the WLAN. ### Claim 6 (depends on 5) The method of claim 5, further comprising: providing, by the communication device, an acknowledgement (ACK) of the transmission from the other device of the WLAN; and transmitting, by the communication device, a data frame to the other device of the WLAN for at least a portion of a remaining portion of the TXOP of the traffic free period of the coexisting cellular connection. ### Claim 7 (depends on 5) The method of claim 5, further comprising: providing, by the communication device, an acknowledgement (ACK) of the transmission from the other device of the WLAN; and transmitting, by the communication device, a null data frame to the other device of the WLAN to defer transmissions from the other device of the WLAN to the communication device by indicating in the null data frame that the communication device is entering a power save mode. ### Claim 8 (depends on 1) The method of claim 1, wherein the coexisting cellular connection is an LTE connection. ### Claim 9 A method, comprising: obtaining, by a communication device supporting coexisting wireless local area network (WLAN) and cellular communications, contention free access to a WLAN channel during a transmission period of a coexisting cellular connection; and providing, by the communication device, a protection frame to at least one other device of the WLAN to defer transmissions from the at least one other device of the WLAN to the communication device for a duration corresponding to at least a portion of a transmit opportunity (TXOP) of the transmission period of the coexisting cellular connection. ### Claim 10 (depends on 9) The method of claim 9, wherein the protection frame is a clear-to-send to self (CTS2self) frame transmitted at the beginning of the transmission period, the CTS2self frame indicating a duration corresponding to the TXOP of the transmission period. ### Claim 11 (depends on 9) The method of claim 9, wherein the communication device is acting as a soft access point of the WLAN and the at least one other device of the WLAN is a client station (STA). ### Claim 12 (depends on 9) The method of claim 9, wherein the communication device is acting as a client station (STA) and the at least one other device of the WLAN is an access point (AP) of the WLAN. ### Claim 13 (depends on 12) The method of claim 12, wherein the protection frame is a null data frame indicating that the communication device is entering a power save mode. ### Claim 14 (depends on 13) The method of claim 13, comprising providing, by the communication device, a second null data frame to the at least one other device of the WLAN after the transmission period of the coexisting cellular connection, the second null data frame indicating that the communication device is exiting the power save mode. ### Claim 15 (depends on 9) The method of claim 9, wherein the protection frame is a clear-to-send to self (CTS2self) frame that indicates that the duration corresponds to at least a remaining portion of the TXOP of the transmission period; and transmitting, by the communication device, a MAC protocol data unit (MPDU) during the remaining portion of the TXOP of the transmission period, where transmission of the MPDU ends within a short inter-frame space (SIFS) of the end of the transmission period. ### Claim 16 (depends on 15) The method of claim 15, wherein the communication device transmits an aggregated MPDU (AMPDU) comprising the MPDU that ends within the SIFS of the end of the transmission period. ### Claim 17 A method, comprising: determining, by a communication device supporting coexisting Bluetooth (BT) and cellular communications, a shift associated with a BT receive-transmit (RX-TX) transaction to avoid concurrent BT RX with cellular TX and concurrent BT TX with cellular RX, the shift based at least in part upon a schedule for the cellular communications; and shifting at least a portion of the BT RX-TX transaction based upon the determined shift. ### Claim 18 (depends on 17) The method of claim 17, wherein a TeSCO interval corresponding to the BT RX-TX transaction is shifted by the determined shift to avoid concurrent BT RX with cellular TX and concurrent BT TX with cellular RX. ### Claim 19 (depends on 17) The method of claim 17, wherein a TX portion of the BT RX-TX transaction is shifted by the determined shift to coordinate reception of the TX portion with a TX subframe period of the cellular communications without shifting a RX portion of the BT RX-TX transaction. ### Claim 20 (depends on 17) The method of claim 17, wherein a RX portion of the BT RX-TX transaction is shifted by the determined shift to coordinate reception of the RX portion with a RX subframe period of the cellular communications without shifting a TX portion of the BT RX-TX transaction.