Medium Access Control (MAC) and Physical Layer (PHY) - CISE

4-June-07 P1901_PRO_016_r0
MPDU
Burst
TA BH Data 1 BH Data 2 BH Data 3 Token
Figure 29 Regular MPDU format
The structure of a regular MPDU is depicted in Figure 29. The MPDU is of variable size and it is composed by:
- A token announce (TA) delimiter: The token announce defines, amongst other things, which is the
current transmitter and what is the maximum transmission time of the current frame (Token Announce
Validity).
- A sequence of bursts, each burst being composed of a Burst Header delimiter followed by data payload.
The bursts included in a transmission frame can have different destination nodes. Burst addressed to a
particular node shall be transmitted in order according to their Burst Id (see 5.2). Bursts to different
destinations can be transmitted in any order. The destination port of the burst is included in the Burst
Header, as well as information such as transfer control, encryption, used FEC, etc. The number of
bursts in a regular MPDU ranges from zero to the maximum allowed by the assigned validity (see
4.4.1).
- A token delimiter.
The type of a regular MPDU is defined by the type of token terminating in the frame. The types of regular
MPDUs are:
1. Distributor Frame
2. Data Frame
3. Silence Frame
4. Polling Frame
5. TDR Polling Frame
6. CSMA Frame
7. Access frame
8. Access Reply frame
9. Non-returnable Data frame
10. Clock Frame
Channel Estimation MPDU
Submission page 93 UPA-OPERA