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Dear 16p members, As Kaushik pointed, we couldn’t agree on how many devices
we need to support or how many devices we can currently support. According to addressing issue, it’s required to determine
this first. I want to show my calculations about current feedback capacities
of 16m and 16e. I think that the size of STID doesn’t need to largely exceed
the capacity of feedback channel because operation is not guaranteed if there
is no relevant feedback. The results show that the number of supportable user based on
feedback channel are 7168/12032/200 in cases of
16m(10MHz)/16m(20MHz)/16e(10MHz), respectively. I think that we can consider these results when we determine the
number of devices to be supported in M2M. Please let me know your opinion. Please see following calculations. Basic conditions -
DL:UL = 5:3 -
One feedback channel makes 6 HARQ
feedback channels. -
Maximum number of LRUs for feedback
channel : 16 (4 bits indication) -
Maximum number of HARQ feedback
channel is 30/60 for 10/20MHz, respectively. -
Let’s
consider maximum HARQ feedback channel. -
The report period of fast feedback
channel is up to 128 frames (=640ms, 3 bits indication) -
<10MHz case, 16m> There is a restriction of number of feedback channel. The MAX
number is 27. (per one subframe) 5 feedback channels are used for HARQ feedback channels. (per
one DL subframe (one HARQ feedback region)) There are 81 (= 27 * 3) feedback channels per one frame. 25 (=5*5) feedback channels are used for HARQ feedback channel. That is, there are 56 fast feedback channels in a frame. When we consider the report period as 8/32/128 frames, the
number of supportable user are 448/1792/7168. <20MHz case, 16m> There are 48 feedback channels. (per one subframe) 10 feedback channels are used for HARQ feedback channels. (per
one DL subframe (one HARQ feedback region)) There are 144 (= 48 * 3) feedback channels per one frame. 50 (=10*5) feedback channels are used for HARQ feedback channel.
That is, there are 94 fast feedback channels in a frame. When we consider the report period as 8/32/128 frames, the
number of supportable user are 752/3008/12032. <10MHz case, 16e> In 16e, the report period of CQICH channel is up to 8 frames (=
40ms, 2bits indication) There are 35 subchannels per one frame in 10MHz. 6 subchannel shall be used as ranging channel. Therefore, if we assume 25 subchannels for CQICH and 4
subchannels for ACK/NAK, the number of supportable user is just 200. BR, Chiwoo From: Kaushik Josiam
[mailto:kjosiam@STA.SAMSUNG.COM] Dear 16p
members In the
DEV RG conference call today, we wanted to hear the member’s view on how
many devices we need to support in 802.16p systems. We can increase the
addressing space to support a large number of users, but in the conference call,
we couldn’t agree on how many devices we need to support or how many
devices we can currently support. Related
to this issue, do we need to define a new M2M specific IDs for M2M
devices? If you
have any thoughts or proposals on the issue, please share them as a reply to
this thread. We thank
you for your cooperation. Regards Kaushik
& Ming-Hung DEV RG
Chairs |