Packet Ieee80211BasicBlockAck

File: src/inet/linklayer/ieee80211/mac/Ieee80211Frame.msg

C++ definition

8.3.1.9.2 Basic BlockAck variant -- 411p.

Usage diagram:

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram:

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends:

Name	Type	Description
Ieee80211BlockAck	packet	8.3.1.9 BlockAck frame format -- 410p.

Fields:

Name	Type	Description
multiTid	bool	Table 8-18—BlockAck frame variant encoding
compressedBitmap	bool
fragmentNumber	int	??
startingSequenceNumber	int
blockAckBitmap	BitVector[64]	The Block Ack Bitmap subfield is 128 octets in length and is used to indicate the received status of up to 64 MSDUs. Bit position n of the Block Ack bitmap, if equal to 1, acknowledges receipt of an MPDU with an MPDU sequence control value equal to (Block Ack Starting Sequence Control + n). Bit position n of the Block Ack bitmap, if equal to 0, indicates that an MPDU with MPDU sequence control value equal to (Block Ack Starting Sequence Control + n) has not been received. Each of the MPDU Sequence Control field and Block Ack Starting Sequence Control subfield values are treated as a 16-bit unsigned integer. For unused fragment numbers of an MSDU, the corresponding bits in the bitmap are set to 0.
tidInfo	int	The TID_INFO subfield of the BA Control field of the Basic BlockAck frame contains the TID for which this BlockAck frame is sent.
type	short	type and subtype
blockAckPolicy	bool	BA Control
byteLength
transmitterAddress	MACAddress	aka address2
toDS	bool
fromDS	bool
retry	bool
moreFragments	bool
duration	simtime_t	TODO: rename to durationField (levy)
AID	short	"id" (Association ID) in the Duration/ID field (-1=no ID)
receiverAddress	MACAddress	aka address1
MACArrive	simtime_t	FIXME remove it, technical data, used inside of MAC module

Source code:

//
// 8.3.1.9.2 Basic BlockAck variant -- 411p.
//
packet Ieee80211BasicBlockAck extends Ieee80211BlockAck
{
    // byteLength TODO
    multiTid = 0;
    compressedBitmap = 0;

    // The BA Information field of the Basic BlockAck frame comprises the Block Ack Starting Sequence Control
    // subfield and the Block Ack Bitmap subfield, as shown in Figure 8-26.

    int fragmentNumber = 0; // ??
    int startingSequenceNumber;
    // The Block Ack Bitmap subfield is 128 octets in length and is used to indicate the received status of up to
    // 64 MSDUs. Bit position n of the Block Ack bitmap, if equal to 1, acknowledges receipt of an MPDU with an
    // MPDU sequence control value equal to (Block Ack Starting Sequence Control + n). Bit position n of the
    // Block Ack bitmap, if equal to 0, indicates that an MPDU with MPDU sequence control value equal to
    // (Block Ack Starting Sequence Control + n) has not been received. Each of the MPDU Sequence Control
    // field and Block Ack Starting Sequence Control subfield values are treated as a 16-bit unsigned integer. For
    // unused fragment numbers of an MSDU, the corresponding bits in the bitmap are set to 0.
    BitVector blockAckBitmap[64]; // 64 * 16 bitmatrix

    // The TID_INFO subfield of the BA Control field of the Basic BlockAck frame contains the TID for which
    // this BlockAck frame is sent.
    int tidInfo;
}