Module org.pcap4j.core
Package org.pcap4j.packet

Class Dot112040BssCoexistenceElement

  • All Implemented Interfaces:
    java.io.Serializable
    public final class Dot112040BssCoexistenceElement
extends Dot11InformationElement
    IEEE802.11 20/40 BSS Coexistence element 
             1                 1                  1
 +-----------------+-----------------+-----------------+
 |   Element ID    |     Length      |Information field|
 +-----------------+-----------------+-----------------+
 Element ID: 72
    The 20/40 BSS Coexistence element is used by STAs to exchange information that affects 20/40 BSS coexistence. The structure of the 20/40 BSS Coexistence Information field is as follows: 
           B0            B1            B2            B3            B4          B5,6,7
 +-------------+-------------+-------------+-------------+-------------+-------------+
 |Information  |Forty MHz    |20 MHz BSS   |OBSS Scanning|OBSS Scanning|  Reserved   |
 |Request      |Intolerant   |Width Request|Exemption    |Exemption    |             |
 |             |             |             |Request      |Grant        |             |
 +-------------+-------------+-------------+-------------+-------------+-------------+
    The Information Request field is used to indicate that a transmitting STA is requesting the recipient to transmit a 20/40 BSS Coexistence Management frame with the transmitting STA as the recipient. The Forty MHz Intolerant field is set to 1 to prohibit an AP that receives this information or reports of this information from operating a 20/40 MHz BSS. When equal to 0, it does not prohibit a receiving AP from operating a 20/40 MHz BSS. This field is used for inter-BSS communication. The definition of this field is the same as the definition of the Forty MHz Intolerant field in the HT Capabilities element. The 20 MHz BSS Width Request field is set to 1 to prohibit a receiving AP from operating its BSS as a 20/40 MHz BSS. Otherwise, it is set to 0. This field is used for intra-BSS communication. The OBSS Scanning Exemption Request field is set to 1 to indicate that the transmitting non-AP STA is requesting the BSS to allow the STA to be exempt from OBSS scanning. Otherwise, it is set to 0. The OBSS Scanning Exemption Request field is reserved when transmitted by an AP. The OBSS Scanning Exemption Request field is reserved when a 20/40 BSS Coexistence element is included in a group addressed frame. The OBSS Scanning Exemption Grant field is set to 1 by an AP to indicate that the receiving STA is exempted from performing OBSS Scanning. Otherwise, it is set to 0. The OBSS Scanning Exemption Grant field is reserved when transmitted by a non-AP STA. The OBSS Scanning Exemption Grant field is reserved when a 20/40 BSS Coexistence element is included in a group addressed frame.
    Since:
    pcap4j 1.7.0
    See Also:
    IEEE802.11, Serialized Form

    • Field Detail

      • informationRequested

        private final boolean informationRequested

      • fortyMhzIntolerant

        private final boolean fortyMhzIntolerant

      • twentyMhzBssWidthRequested

        private final boolean twentyMhzBssWidthRequested

      • obssScanningExemptionRequested

        private final boolean obssScanningExemptionRequested

      • obssScanningExemptionGranted

        private final boolean obssScanningExemptionGranted

      • bit5

        private final boolean bit5

      • bit6

        private final boolean bit6

      • bit7

        private final boolean bit7

    • Constructor Detail

      • Dot112040BssCoexistenceElement

        private Dot112040BssCoexistenceElement​(byte[] rawData,
                                       int offset,
                                       int length)
                                throws IllegalRawDataException
        Parameters:
        rawData - rawData
        offset - offset
        length - length
        Throws:
        IllegalRawDataException - if parsing the raw data fails.

    • Method Detail

      • isInformationRequested

        public boolean isInformationRequested()
        Returns:
        true if the Information Request field is set to 1; otherwise false.

      • is40MhzIntolerant

        public boolean is40MhzIntolerant()
        Returns:
        true if the Forty MHz Intolerant field is set to 1; otherwise false.

      • is20MhzBssWidthRequested

        public boolean is20MhzBssWidthRequested()
        Returns:
        true if the 20 MHz BSS Width Request field is set to 1; otherwise false.

      • isObssScanningExemptionRequested

        public boolean isObssScanningExemptionRequested()
        Returns:
        true if the OBSS Scanning Exemption Request field is set to 1; otherwise false.

      • isObssScanningExemptionGranted

        public boolean isObssScanningExemptionGranted()
        Returns:
        true if the OBSS Scanning Exemption Grant field is set to 1; otherwise false.

      • getBit5

        public boolean getBit5()
        Returns:
        true if the bit 5 of the Information field is set to 1; otherwise false.

      • getBit6

        public boolean getBit6()
        Returns:
        true if the bit 6 of the Information field is set to 1; otherwise false.

      • getBit7

        public boolean getBit7()
        Returns:
        true if bit 7 of the Information field is set to 1; otherwise false.

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • toString

        public java.lang.String toString​(java.lang.String indent)
        Parameters:
        indent - indent
        Returns:
        the string representation of this object.