Thomas Kunz
Systems and Computer Engineering
209
HIPERLAN 1 EY-NPMA
nEY-NPMA (Elimination Yield Non-preemptive Priority Multiple Access)
–3 phases: priority resolution, contention resolution, transmission
–finding the highest priority
nevery priority corresponds to a time-slot to send in the first phase, the higher the priority the earlier the time-slot to send
nhigher priorities can not be preempted
nif an earlier time-slot for a higher priority remains empty, stations with the next lower priority might send
nafter this first phase the highest current priority has been determined
prioritization
contention
transmission
transmission
synchronization
priority detection
priority assertion
t
user data
elimination burst
elimination survival
 verifivcation
yield listening
IYS
IPS
IPA
IES
IESV