Scrambler initialization for multi-user clear to send transmission

Abstract

This disclosure describes systems, methods, and devices related to scrambler initialization for multi-user (MU) clear to send (CTS) transmission. A first device may identify a MU request to send (RTS) frame received from a second device. The first device may determine an initial state of a scrambler based on the first 7 bits of a service field of the MU-RTS frame. The first device may cause first data to be scrambled, using the initial state of the scrambler, resulting in second data. The first device may cause to send a MU-CTS frame that comprises the second data to the second device.

What is claimed is: 
     
         1 . A first device, the first device comprising processing circuitry coupled to storage, the processing circuitry configured to:
 identify a multi-user (MU) request to send (RTS) frame received from a second device;   determine an initial state of a scrambler based on the first 7 bits of a service field of the MU-RTS frame;   cause first data to be scrambled, using the initial state of the scrambler, resulting in second data; and   cause to send a MU clear to send (CTS) frame that comprises the second data to the second device.   
     
     
         2 . The first device of  claim 1 , wherein the service field is a first service field, and wherein the MU-CTS frame comprises a second service field. 
     
     
         3 . The first device of  claim 2 , wherein the initial state of the scrambler is determined such that the first 7 bits of the first service field are equal to the first 7 bits of the second service field. 
     
     
         4 . The first device of  claim 1 , wherein the initial state of the scrambler is determined such that the initial state of the scrambler is equal to the first 7 bits of the service field. 
     
     
         5 . The first device of  claim 1 , wherein the second data is included in a service field of the MU-CTS frame. 
     
     
         6 . The first device of  claim 1 , wherein the scrambler is a length-127 physical layer convergence protocol (PLCP) protocol data unit (PPDU)-synchronous scrambler. 
     
     
         7 . The first device of  claim 1 , further comprising a transceiver configured to transmit and receive wireless signals, wherein the wireless signals are associated with the MU-RTS frame and the MU-CTS frame. 
     
     
         8 . The first device of  claim 7 , further comprising an antenna coupled to the transceiver. 
     
     
         9 . A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors of a first device result in performing operations comprising:
 identifying a multi-user (MU) request to send (RTS) frame received from a second device;   determining an initial state of a scrambler based on the first 7 bits of a service field of the MU-RTS frame;   causing first data to be scrambled, using the initial state of the scrambler, resulting in second data; and   causing to send a MU clear to send (CTS) frame that comprises the second data to the second device.   
     
     
         10 . The non-transitory computer-readable medium of  claim 9 , wherein the service field is a first service field, and wherein the MU-CTS frame comprises a second service field. 
     
     
         11 . The non-transitory computer-readable medium of  claim 10 , wherein the initial state of the scrambler is determined such that the first  7  bits of the first service field are equal to the first 7 bits of the second service field. 
     
     
         12 . The non-transitory computer-readable medium of  claim 9 , wherein the initial state of the scrambler is determined such that the initial state of the scrambler is equal to the first 7 bits of the service field. 
     
     
         13 . The non-transitory computer-readable medium of  claim 9 , wherein the second data is included in a service field of the MU-CTS frame. 
     
     
         14 . The non-transitory computer-readable medium of  claim 9 , wherein the scrambler is a length-127 physical layer convergence protocol (PLCP) protocol data unit (PPDU)-synchronous scrambler. 
     
     
         15 . A method comprising:
 identifying, by one or more processors of a first device, a multi-user (MU) request to send (RTS) frame received from a second device;   determining, by the one or more processors, an initial state of a scrambler based on the first 7 bits of a service field of the MU-RTS frame;   causing, by the one or more processors, first data to be scrambled, using the initial state of the scrambler, resulting in second data; and   causing to send, by the one or more processors, a MU clear to send (CTS) frame that comprises the second data to the second device.   
     
     
         16 . The method of  claim 15 , wherein the service field is a first service field, and wherein the MU-CTS frame comprises a second service field. 
     
     
         17 . The method of  claim 16 , wherein the initial state of the scrambler is determined such that the first 7 bits of the first service field are equal to the first 7 bits of the second service field. 
     
     
         18 . The method of  claim 15 , wherein the initial state of the scrambler is determined such that the initial state of the scrambler is equal to the first 7 bits of the service field. 
     
     
         19 . The method of  claim 15 , wherein the second data is included in a service field of the MU-CTS frame. 
     
     
         20 . The method of  claim 15 , wherein the scrambler is a length-127 physical layer convergence protocol (PLCP) protocol data unit (PPDU)-synchronous scrambler.