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doc.: IEEE 802.11-15/0716r6
Submission
PHY SIG Frame Structure for IEEE 802.11aj (45GHz)
Authors/contributors:
Date: 2015-05Presenter: Shiwen HE
May 2015
Shiwen He, Haiming WangSlide 1
Name Company Address Phone Email
Shiwen HE
Southeast University (SEU)
2 Sipailou, Nanjing 210096, China
+86-25-5209 1653-3121 (ext.)
Haiming WANG +86-25-5209 1653-301 (ext.)
Yongming HUANG [email protected]
Guangshi YU [email protected]
Luxi YANG [email protected]
Wei HONG +86-25-5209 1650 [email protected]
Bo SUN ZTE [email protected]
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 2
Abstract
• The proposal presents physical layer SIG structure for IEEE 802.11 aj
(45GHz) in millimeter-wave WLAN communication.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 3
Background
Challenges of future WLAN
– Limited spectrum resources
– High-speed data requirements
Features of future WLAN
– Large bandwidth
– Multiple channel mode
– Multi-user
– Multi-stream
45GHz millimeter-wave communication
– Digital home appliances
– Ultra-high-speed (10Gbps) wireless applications
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 4
Technology Objects
The SIG frame structure try to achieve the following technical goals
– Dynamic bandwidth
– Multi-stream
– Energy efficiency
– Scrambler
– Single-carrier & Multi-carrier compatible
Dynamic bandwidth
Achieving dynamically channel bandwidth selection for 1080MHz BSS to enhance the
adaptability in different channel environments and improve spectral efficiency.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 5
Technology Objects
Multi-stream
Achieve a multi-stream control to obtain the multiplexing gain.
Energy efficient communication
Achieve energy efficient communication, i.e., allow non-AP STAs in TXOP power save
mode to enter Doze state during a TXOP
Scrambler
Scrambling effectively reduces the PAPR in OFDM system
Single-carrier & Multi-carrier
Support single-carrier and multi-carrier simultaneously
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 6
QMG PHY SIG Structure
Scra
mbl
er
Init
ilaiz
atio
n
PAID
Len
gth
MC
S
Agg
rega
tion
B0 B6 B7 B9 B17B18 B35B36 B39
7 1 9 18 1 11
B41
Add
ition
al
PPD
U
5
5
B43 B47
Tra
inin
g L
engt
h
Bits:
B8Spreading
FactorControl PHY
SC PHY
OFDM PHY
Reserved
1
2 2
B56 B57
STB
C
NSS
B62
1
Res
erve
d
16
Bea
m T
rack
ing
Req
uest
4
1
Tur
naro
ud
B48 B63B51 B55
1
B64 B79
CR
C
B58 B59 B60 B61
2Bits:
Control PHY
SC PHY
OFDM PHYL
ast R
SSI
DB
Reserved
B40
Pack
et T
ype
Res
erve
d
B42
Cod
ewor
d L
engt
h
B49 B50
1
TX
OP
_PS
_NO
T_A
LL
OW
ED
Upl
ink
Idic
atio
n
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 7
Explanation of each field in SIG Scrambler
Bit Fields Number of Bits
Description
B0-B6 Scrambler Initialization 7 The initial scrambler state.B7 Short GI 1 Set to 0 if short guard interval is not used in the
Data field.Set to 1 if short guard interval is used in the Data field.
B8 Uplink Indication 1 Set to the value of the TXVECTOR parameter UPLINK_INDICATION.
B9-B17 PAID 9 If Uplink Indication is not present or set to 1, set to the value of the TXVECTOR parameter PARTIAL_AID. PARTIAL_AID provides an abbreviated indication of the intended recipient(s) of the PSDU (see 9.20a (Group ID, partial AID, Uplink Indication and COLOR in S1G PPDUs))). If Uplink Indication is set to 0, B7-B9 are set to the value of the TXVECTOR parameter COLOR and B10-B15 are set to the value of
B18-B35 Length 18 Number of data octets in the PSDU, Range 0-262143;
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 8
Explanation of each field in SIG Dynamic bandwidth
B36-B39 Last RSSI 4 For SC/OFDM PHY:Contains a copy of the parameter LAST_RSSI from the TXVECTOR. When set to 0, this field is reserved and ignored by the receiver.The value is an unsigned integer:—Values of 2 to 14 represent power levels (–71+value×2) dBm.—A value of 15 represents a power greater than or equal to –42 dBm.—A value of 1 represents a power less than or equal to –68 dBm.Value of 0 indicates that the previous packet was not received a SIFS period before the current transmission.For CPHY, SC/OFDM MIMO PHY: Reserved.
B40 DB 1 For OFDM PHY:If the PPDU is transmitted on 1080MHz channel: set Dynamic Bandwidth to 1 for allowing dynamic bandwidth; set to 0 for non-allowing dynamic bandwidth.Otherwise set to 0; (Reserved)For CPHY, SC PHY: Reserved.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 9
Explanation of each field in SIG Continued
Bit Fields Number of Bits Description
B41-B42 Spreading Factor/Aggregation/ Additional PPDU
2 For CPHY:Set to 0: spreading by 13Set to 1: spreading by 7Set to 2: spreading by 4Set to 3: no spreading For SC/OFDM PHY:Aggregation:Set to 1 indicate that the PPDU in the data portion of the packet contains an A-MPDU; otherwise, set to 0. Additional PPDU:Contains a copy of the parameter ADD-PPDU from the TXVECTOR. A value of 1 indicates that this PPDU is immediately followed by another PPDU with no IFS or preamble on the subsequent PPDU.A value of 0 indicates that no additional PPDU follows this PPDU.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 10
Explanation of each field in SIG Continued
Bit Fields Number of Bits DescriptionB43-B47 Training Length 5 For SC/OFDM PHY:
Corresponds to the TXVECTOR parameter TRNLEN.If the Beam Tracking Request field is 0, the Training Length field indicates the length of the training field. The use of this field is defined in 21.10.2.2.3. A value of 0 indicates that no training field is present in this PPDU.If the Beam Tracking Request field is 1 and the Packet Type field is 10, the Training Length field indicates the length of the training field. If the Packet Type field is 11, the Training Length field indicates the length of the training field requested for receive training.For CPHY: Reserved.
B48 Beam Tracking Request 1 Corresponds to the TXVECTOR parameter BEAM_TRACKING_REQUEST.Set to 1 to indicate the need for beam tracking (9.35.7); otherwise, set to 0.The Beam Tracking Request field is reserved when the Training Length field is 0.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 11
Explanation of each field in SIG Energy Efficiency
Bit Fields Number of Bits Description
B49 Codeword Length 1 Set to 0 indicate that the codeword length is 672; Set to 1 indicate that the codeword length is 2016;
B50 TXOP_PS_NOT_ALLOWED 1 Set to 0 by QMG AP if it allows non-AP QMG STAs in TXOP power save mode to enter Doze state during a TXOP.Set to 1 otherwise.The bit is reserved and set to 1 in QMG PPDUs transmitted by a non-AP QMG STA.
B51-B55 MCS 5 Index into the Modulation and Coding Scheme table.
B56-B57 Packet Type 2 When the Training Length field is nonzero, corresponds to the TXVECTOR parameter PACKET-TYPE.—Packet Type = 11 indicates either a packet whose data part is followed by one or more TRN-R subfields, or a packet that is requesting TRN-R subfields to be appended to a future response packet.—Packet Type = 10 indicates a packet whose data part is followed by one or more TRN-T subfields.When the Training Length field is zero and Packet Type = 01 indicates that PPDU is a sounding PPDU.This field is reserved when the Training Length field is zero and Packet Type = 00.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 12
Explanation of each field in SIG Multi-stream
Bit Fields Number of Bits Description
B58-B59 STBC 2 For CPHY: Reserved.For SC/OFDM PHY：Set to 00 to indicate no STBC.Set to 01 if Alamouti STBC is used.Set to 10 if QSTBC is used.Otherwise set to 11.
B60-B61 NSS 2 Set to 0 for 1 spatial stream.
Set to 1 for 2 spatial streams.
Set to 2 for 3 spatial streams.
Set to 3 for 4 spatial streams..
B62 Turnaround 1 As defined in Table 21-1.
B63 Reserved 1 Reserved.
B64-B79 CRC 16 QMG SIG check sequence. Definition of this field calculation is in 26.3.7.
Note 1--A value of 0 in the QMG Length field indicates a PPDU that does not include a data field, i.e., NDP. NDP transmissions are used for sounding purposes only (see 9.21.2). The packet ends after the last QMG MCTF or the QMG SIG.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 13
Conclusion
• A common SIG was proposed to simultaneously support multiple
carrier mechanism for IEEE 802.11aj (45G) millimeter-wave
communication.
doc.: IEEE 802.11-15/0716r6
Submission
May 2015
Shiwen He, Haiming WangSlide 14
Thanks for Your Attention.
