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stds-802-16: TG1 COMMENT:
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
18
[Starting Line #]
57
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add to the MAC-CREATE-CONNECTION.request primitive a field called
'ARQ parameters'. The ARQ parameters include detials on whether ARQ is used
or
not for the connection, maximum re-transmission limit and acknowledgment
window size.
[Reason for Edit]
Add support for MAC level ARQ. See also related contibution titled
'Suggested
modifications to 802.16.1 standard draft to support MAC level ARQ'
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
40
[Starting Line #]
22
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Delete sections 2.3.3.1.3 and 2.3.3.1.4 dealing with transmit equalizer taps
[Reason for Edit]
Use of equalizer on the transmitter side has unpredictable effect on the
spectral shape of the RF power emitted by the CPE, and may cause harmful
interference to adjacent channels. Further, the RF channel might change
fast enough that transmitter equalization techniques are useless.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
63
[Starting Line #]
37
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add to the line, 'Alternatively, the CID can be the terminal ID of the CPE
requesting the uplink bandwidth'
[Reason for Edit]
Enable a terminal to aggregately request bandwidth on behalf of all its
connectiona. This mode reduces the amount of bandwidth requests
considerably,
and is useful for many types of services (e.g. best effort service).
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
64
[Starting Line #]
16
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Modify the name of CSI bit to 'ARQ bit'. When set, this bit will indicate
that
the packet belongs to an ARQ enabled connection.
[Reason for Edit]
Add support for MAC level ARQ. See also related contibution titled
'Suggested
modifications to 802.16.1 standard draft to support MAC level ARQ'
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
66
[Starting Line #]
32
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add a section describing ARQ operation,
'When the ARQ bit is set, the ARQ mechanism requires adding control and
checksum fields to each ARQ enabled packet. The checksum field is four bytes
long, standard IEEE CRC-32, and it is appended at the end of the packet. The
control field is two bytes long and is prepended at the beginning of the
packet. The control bit structure contains a 4 bit <retry number> and a 12
bit
<sequence number>. The retry number field is reset when a packet is first
sent, and is incremented whenever it is retransmitted (up to the terminal
value of 15). The sequence number field is assigned to each packet upon its
first transmission, and then incremented. The sequence number does not
change
when a packet is retransmitted. These ARQ related fields are added only to
packets for which the ARQ usage indication is set in the generic MAC
header.'
[Reason for Edit]
Add support for MAC level ARQ. See also related contibution titled
'Suggested
modifications to 802.16.1 standard draft to support MAC level ARQ'
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
67
[Starting Line #]
43
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add to table 6 a management message called 'ACK'. The explenation for this
message can be,
'The message will be an acknowledgment message sent to a sender for packets
received correctly. The acknowledgment message may group together more than
one packet, and will carry the sequence number(s) for packets that have been
correctly received.'
[Reason for Edit]
Add support for MAC level ARQ. See also related contibution titled
'Suggested
modifications to 802.16.1 standard draft to support MAC level ARQ'
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
69
[Starting Line #]
6
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
E
[Detailed Description of Proposed Insertion, Deletion, Change]
A detailed description of the contents of the MAC management header shown in
figure 19 is needs to be inserted.
[Reason for Edit]
The structure of the MAC management header is not shown in detail, therefore
it is not clear what it contains.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
70
[Starting Line #]
15
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add to table 7 the following parameter,
Name - FSDD/TDD frame time
Type - 8
Time Reference - Duration of the TDD/FSDD frame
Length - 4
Value - The number of PS contained in a FSDD or TDD frame. This TLV is only
used if the PHY Type field of the DL-MAP message is {0, 1, 3} (TDD, FSDD).
[Reason for Edit]
Make the length of frames used flexible, in order to enable system
optimization in terms of header overhead vs. latency required by the data
services supported. (The reference to 1msec frame length appears numerous
times in the draft, they should all be replaced by the frame length
parameter)
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
72
[Starting Line #]
7
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add another option to the value field, '4 = Adaptive modulation'
[Reason for Edit]
Include the adaptive modulation allowed under PHY mode-B in allowed
modulation
types
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
73
[Starting Line #]
39
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
For the maximum burst size parameter, change the size of the length field
to 2
[Reason for Edit]
Allow longer uplink bursts to be specified by the burst profile
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
76
[Starting Line #]
7
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add another option to the value field, '4 = Adaptive modulation'
[Reason for Edit]
Include the adaptive modulation allowed under PHY mode-B in allowed
modulation
types
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
77
[Starting Line #]
9
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add to figure 23 a 32 bit parameter called 'FSDD/TDD frame duration'. This
parameter will indicate duration of the TDD/FSDD frame (in nsec). This
parameter is meaningful only for PHY types 0, 1, 3 (TDD, FSDD).
[Reason for Edit]
Enable any CPE to synchronize to the BST based on correctly receiving a DL
map. The presence of frame duration information in the DL map enables the
CPE
to learn the frame duration dynamically, thus allowing a flexible frame
size.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
78
[Starting Line #]
7
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Update figure 24 to contain only the PHY type (3 bits) and frame number (29
bits)
[Reason for Edit]
The reason for having 3 distinct counters, i.e. hyperframe number,
multiframe
number and frame number is not clear. Throught all the draft there is not
any
reference to any specific use for any of these counters.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
81
[Starting Line #]
12
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
E
[Detailed Description of Proposed Insertion, Deletion, Change]
There seems to be some typo in this paragraph, as PHY type 5 is omitted
while
a PHY type 2 is mentioned. I believe that the paragraph should read
'Effective
start time of the uplink allocation defined by the UL-MAP in units of
mini-slots. The start time is relative to the start of a frame in which
UL-MAP
message is transmitted (PHY Type = {0,1,3}) or from BS initialization (PHY
Type = 5).'
[Reason for Edit]
Fix typo in draft 1
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
86
[Starting Line #]
6
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Delete lines 6 to 9 dealing with transmit equalizer information
[Reason for Edit]
Use of equalizer on the transmitter side has unpredictable effect on the
spectral shape of the RF power emitted by the CPE, and may cause harmful
interference to adjacent channels. Further, the RF channel might change
fast enough that transmitter equalization techniques are useless.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
110
[Starting Line #]
35
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Add modulation option '0x02 = 64-QAM'
[Reason for Edit]
The DMC-REQ message can be used to increase modulation as well as decrease
it,
so it should cover all allowed modulations.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
110
[Starting Line #]
62
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Change the length of the preamble in the Frame Control Header is to 72 QAM
symbols.
[Reason for Edit]
The burst preamble has many duties. The preamble it is used to detect the
start of the burst, but it could also be used for training equalizers,
compensating for fast channel gain variations, and other kinds of channel
impairments. It is therefore important in order to achieve a robust
standard,
to allow a preamble length that will enable extracting sufficient
information
from the preamble even in the presence of timing errors, frequency
mismatches,
channel gain variations, noise and multipath effects. The proposed length of
the preamble introduces a negligible overhead (0.3% for 1msec frame at
25Msymbols/Sec).
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
113
[Starting Line #]
8
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Delete lines 8 to 11
[Reason for Edit]
The restriction imposed on burst FDD systems is unnecessary, it does not
simplify implementation, and will severely penalize performance in systems
where most users are half duplex.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
120
[Starting Line #]
4
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Set the time relevance of PHY and MAC control Information for the TDD case
(in figure 57) to point within the same frame and not to the next frame.
[Reason for Edit]
Forcing the uplink response to the downlink allocation map to be one frame
apart inserts an unavoidable delay of one frame in the system. This inherent
delay may become significant for frame length longer than 1msec.A practical
system a TDD system will have a minimum ratio of downlink to uplink traffic
higher than zero, so it can be guaranteed that there is enough time to
process
the downlink map and respond within the same frame.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
137
[Starting Line #]
4
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
E
[Detailed Description of Proposed Insertion, Deletion, Change]
No exact wording for change, but the paragraph (lines 4 to 16) should be
updated to refer to modes A and B of this standard, rather than to DOCSIS
PHY.
[Reason for Edit]
The paragraph describing when the downstream signal is considered valid
refers
to a DOCSIS PHY rather than to the two specific PHY options of 802.16 PHY.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
145
[Starting Line #]
36
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
E
[Detailed Description of Proposed Insertion, Deletion, Change]
Add more details about use of DHCP as to obtain an IP address.
[Reason for Edit]
Use of DHCP to obtain an IP address as described in the current draft is not
well defined. The CPE broadcast mode used by DHCP is not supported in the
draft. The DHCP server location and its connection to the proposed MAC layer
are not clear.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
285
[Starting Line #]
10
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Change the table such that code types 2 and 3 in the are optional, and only
code 1 is mandatory.
[Reason for Edit]
Reduce the complexity (and hence the cost) of standard compliant equipment,
while not preventing interested manufacturers from manufacturing better, yet
more expensive equipment.
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
286
[Starting Line #]
23
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Insert more details about the proposed convolutional code (state machine and
puncturing drawing).
[Reason for Edit]
Clarify the proposed coding option in the draft, and remove any ambiguity.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
291
[Starting Line #]
23
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Modify the sentence such that the only mandatory modulation is QPSK.
16QAM and 64QAM are optional.
[Reason for Edit]
Reduce the complexity (and hence the cost) of standard compliant equipment,
while not preventing interested manufacturers from manufacturing better, yet
more expensive equipment.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
293
[Starting Line #]
12
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Modify figure 134 and figure 135 such that the bit mapping I and Q
components
are not interleaved. The bits should be interpreted I1,I2,I3,Q1,Q2,Q3. The
bits to symbol translation for the I and Q components will then be
identical.
One axis (the other is identical) of figure 134 will then be described by
the
table below
I1,I2,I3 (Q1,Q2,Q3) | symbol I axis (Q axis)
---------------------+-----------------------
0 0 0 | 3
0 0 1 | 1
0 1 0 | 5
0 1 1 | 7
1 0 0 | -3
1 0 1 | -1
1 1 0 | -5
1 1 1 | -7
---------------------+-----------------------
[Reason for Edit]
In the bit mapping for the QAM16 constellation the I and Q components are
not
interleaved, and it makes sense to keep the mapping consistent between QAM16
and QAM64 constellations.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
301
[Starting Line #]
44
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Change the table such that code types 2 and 3 in the are optional, and only
code 1 is mandatory.
[Reason for Edit]
Reduce the complexity (and hence the cost) of standard compliant equipment,
while not preventing interested manufacturers from manufacturing better, yet
more expensive equipment.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
304
[Starting Line #]
50
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Modify the sentence such that the only mandatory modulation is QPSK.
16QAM and 64QAM are optional.
[Reason for Edit]
Reduce the complexity (and hence the cost) of standard compliant equipment,
while not preventing interested manufacturers from manufacturing better, yet
more expensive equipment.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
306
[Starting Line #]
22
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Modify the figure specifing gray 16 bit mapping. The bits should be
interpreted I1,I2,Q1,Q2. The bits to symbol translation for the I and Q
components will then be identical.
One axis (the other is identical) of the figure will then be described by
the
table below
I1,I2 (Q1,Q2) | symbol I axis (Q axis)
---------------+-----------------------
0 0 | 1
0 1 | 3
1 0 | -1
1 1 | -3
---------------+-----------------------
[Reason for Edit]
The upstream channel is a burst modem, and the current, rotationally
invariant
bit mapping has no special advantage for it. The proposed bit mapping is the
same as the one proposed for the burst modem in the downstream channel, and
thus increases the standard consistency.
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
307
[Starting Line #]
21
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Modify figure 141 and figure 142 such that the bit mapping I and Q
components
are not interleaved. The bits should be interpreted I1,I2,I3,Q1,Q2,Q3. The
bits to symbol translation for the I and Q components will then be
identical.
One axis (the other is identical) of figure 141 will then be described by
the
table below
I1,I2,I3 (Q1,Q2,Q3) | symbol I axis (Q axis)
---------------------+-----------------------
0 0 0 | 3
0 0 1 | 1
0 1 0 | 5
0 1 1 | 7
1 0 0 | -3
1 0 1 | -1
1 1 0 | -5
1 1 1 | -7
---------------------+-----------------------
[Reason for Edit]
In the downstream channel, in the bit mapping for the QAM16 constellation,
the I and Q components are not interleaved. It makes sense to keep the
mapping
across the burst modem in the upstream and downstream channel and across
QAM16
and QAM64 constellations.
[Submitter's Last Name]
Leiba
[Submitter's Last Name]
Leiba
[Submitter's First Name]
Yigal
[Membership Status: (M)ember; (O)bserver; (N)either]
M
[Starting Page #]
310
[Starting Line #]
47
[(T)echnical for Content-Related Material; (E)ditorial for typos,
grammar, etc., (TBD) for a comment on a section marked "TBD"]
T
[Detailed Description of Proposed Insertion, Deletion, Change]
Change sentence to read 'Subscriber station equipment should support symbol
rates that lie in the interval 5 Mbaud to 40 Mbaud for the downstream and
upstream.
[Reason for Edit]
Specify identical Baud rate range for upstream and downstream. This enables
using standard compliant equipment for point to point type of installations.
Yigal Leiba
BreezeCOM Ltd.
Atidim Technological Park, Building #1, POB 13139
Tel-Aviv, Israel 61131
Tel: 972 (3) 645 6254
Fax: 972 (3) 645 6290
Personal Fax: 972 (3) 645 6222
email: igall@breezecom.co.il
http://www.breezecom.com