Radio communication apparatus and radio communication method

Patent metadata

Field	Value
Publication number	US-12082136-B2
Application number	US-202117536337-A
Country	US
Kind code	B2
Filing date	Nov 29, 2021
Priority date	Nov 30, 2020
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A radio communication apparatus makes it possible to prevent contents of communication from being intercepted. The radio communication apparatus includes a generation unit configured to generate a first unique word based on operation time information of the radio communication apparatus before communication with a radio communication apparatus is started, and generate, for each radio frame, an ith unique word (i: an integer equal to or greater than two) based on an (i−1)th unique word when the communication is started, and a transmitting unit configured to transmit a first radio frame including the first unique word and an ith radio frame including the ith unique word to the radio communication apparatus.

First claim

What is claimed is:

1. A radio communication apparatus comprising:
at least one memory storing instructions; and
at least one processor configured to execute the instructions to:
generate a first unique word based on operation time information of the radio communication apparatus before communication with another radio communication apparatus is started, and generate, for each radio frame, an ith unique word based on an (i−1)th unique word when the communication is started, wherein i is an integer equal to or greater than two;
transmit a first radio frame including the first unique word and an ith radio frame including the ith unique word to the another radio communication apparatus;
output a first reference series based on the operation time information, and output, for each radio frame, an ith reference series based on an (i−1)th reference series, the first reference series being a pseudo-random number series;
output a first output value based on the first reference series and based on a random-number table, and output, for each radio frame, and an ith output value based on the ith reference series and based on the random-number table; and
output a first conversion series based on the first output value as the first unique word, and output, for each radio frame, an ith conversion series based on the ith output value as the ith unique word, the ith conversion series being a pseudo-random number series.

2. The radio communication apparatus according to claim 1 , wherein
the radio communication apparatus further comprises:
a shift register comprising a plurality of taps, the shift register configured to input a plurality of bits constituting the operation time information to the plurality of taps;
a feedback tap configured to specify, among the plurality of taps, taps of which tap values are to be fed back to the shift register; and
an arithmetic circuit configured to calculate an exclusive OR of values output from the specified taps, and feed back the calculated value to the shift register, and
the at least one processor is configured to execute the instructions to shift the shift register a predetermined number of times and to output the first reference series based on values output from the plurality of taps.

3. The radio communication apparatus according to claim 1 , wherein the at least one processor is configured to execute the instructions to transmit the first radio frame including the operation time information and the first unique word.

4. The radio communication apparatus according to claim 1 , wherein the at least one processor configured to execute the instructions to periodically update the first unique word before the communication is started.

5. A radio communication apparatus comprising:
at least one memory acquiring storing instructions and
at least one processor configured to execute the instructions to:
generate a first reception unique word corresponding to a first transmission unique word based on second operation time information of the radio communication apparatus before communication with another radio communication apparatus is started, the second operation time information corresponding to first operation time information that the another radio communication apparatus uses to generate the first transmission unique word;
receive a radio frame including the first transmission unique word based on the first reception unique word;
generate, for each radio frame, an ith reception unique word based on an (i−1)th reception unique word when the communication is started, the ith reception unique word corresponding to an ith transmission unique word generated by the another radio communication apparatus, wherein i is an integer equal to or greater than two;
receive a radio frame including the ith transmission unique word based on the ith reception unique word;
output, based on the second operation time information, a first reception reference series corresponding to a first transmission reference series generated by the another radio communication apparatus, and output, for each radio frame, an ith reception reference series corresponding to an ith transmission reference series generated by the another radio communication apparatus based on an (i−1)th reception reference series, the first reference series being a pseudo-random number series;
output a first reception output value corresponding to a first transmission output value output from the another radio communication apparatus, and output, for each radio frame, an ith reception output value corresponding to an ith transmission output value output from the another radio communication apparatus, wherein the first reception output value is output based on the first reception reference series and a random-number table, and the ith reception output value is output based on the ith reception reference series and based on the random-number table; and
output a first reception conversion series corresponding to a first transmission conversion series generated by the another radio communication apparatus, and output, for each radio frame, an ith reception conversion series corresponding to an ith transmission conversion series generated by the another radio communication apparatus, wherein the first reception conversion is output series based on the first reception output value as the first reception unique word, and wherein the ith reception conversion series is output based on the ith reception output value as the ith reception unique word.

6. The radio communication apparatus according to claim 5 , wherein
the radio communication apparatus further comprises:
a shift register comprising a plurality of taps, the shift register configured to input a plurality of bits constituting the second operation time information to the plurality of taps;
a feedback tap configured to specify, among the plurality of taps, taps of which tap values are to be fed back to the shift register; and
an arithmetic circuit configured to calculate an exclusive OR of values output from the specified taps, and feed back the calculated value to the shift register, and
the at least one processor is configured to execute the instructions to shift the shift register a predetermined number of times to output the first reception reference series based on values output from the plurality of taps.

Assignees

• Nec Corp

Inventors

• Watanabe Shingo

Classifications

• H04L7/041 Primary

  using special codes as synchronising signal · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title