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Yigal,
I
agree, in Fig 85, T4 does not cause MAC to re-iniatialize. However, in Fig 82,
the non-OFDMA case, T4 does cause MAC to reinitialize. T4 is also defined as "a
timer waiting for unicast ranging opportunity" in Table 295, it doesn't seem to
quite fit into the use of T4 in OFDMA based periodic ranging. In the
non-OFDMA case, the periodic ranging is controlled by T27 timer instead of T4.
The
original concern we have it T4 is too long to be used as periodic ranging timer.
But, looking more closely at the two sections, I feel that T4 should be kept as
the way it is and a new timer should be added as similar to T27
timer.
Hope I
explain clearly. Thanks for your reply.
Mary
Hi
Mary,
Looking at figure 85, I think T4 does not directly
cause the MAC to re-initialize. Is there any issue with T4 except it being
defined as minimum 30s that requires defining a new timer for
OFDMA?
Yigal
Yigal,
Thanks for the clarification. For non-OFDMA based periodic ranging,
when T4 times out, MAC is re-initialized and the frequency of periodic
ranging is controled by BS using T27. For OFDMA based period ranging, it
seems to be not too appropriate to use the same T4 timer for periodic
ranging timer. Should we define a new timer for OFDMA periodic
ranging?
Thanks.
Mary
Hi Mary,
It is indeed T4, and it is long because the
original values were intended for Fixed service, not
mobile.
Yigal Leiba
Hi,
In section 6.3.10.3, it's stated " Using the OFDMA ranging mechanism, the
periodic ranging timer is controlled by the SS, not the BS". Is this
Periodic ranging timer T4 as in Fig 85 or is this a seperate timer? It
seems that the T4 value is too long to be served as a periodic ranging
timer.
Thanks.
Mary
Chion
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