802.11v Physical Rates
Does 802.11v define new physical rates?
No, 802.11v does not define new PHY rates—it operates on top of existing PHY standards.
Which PHY layers can be used with 802.11v?
802.11v can work with any 802.11 PHY layer, including 802.11a/b/g/n/ac/ax.
How does 802.11v affect physical rate selection?
It does not directly control PHY rate selection but enables better decisions through context-aware management.
Is rate adaptation used with 802.11v?
Yes, standard PHY-layer rate adaptation continues to operate with 802.11v enhancements.
Can 802.11v help optimize PHY rate usage?
Indirectly, yes—by improving station mobility and load balancing, better rates can be maintained.
Does 802.11v influence PHY capabilities reporting?
No, PHY capabilities reporting is handled by base 802.11 standards, not 802.11v specifically.
Does 802.11v change modulation or coding schemes?
No, it uses whatever schemes the underlying PHY supports.
How is throughput affected by 802.11v?
802.11v may improve throughput by helping clients associate with better APs, leading to higher PHY rates.
What physical rates are commonly used with 802.11v?
Rates depend on the PHY—e.g., up to 600 Mbps with 802.11n, 6.9 Gbps with 802.11ax.
Can low-rate clients still benefit from 802.11v?
Yes, 802.11v benefits all clients by improving mobility and resource use, regardless of their rate.
Is PHY rate management centralized in 802.11v?
No, rate management is still performed by the station and AP based on link conditions.
Can 802.11v improve link quality?
Indirectly, yes—by helping stations transition to better APs with stronger signals and higher rates.
Does 802.11v impact channel bandwidth use?
No, channel bandwidth usage (e.g., 20/40/80/160 MHz) remains a function of the PHY and network setup.
Are PHY changes needed to support 802.11v?
No changes are required; 802.11v is a MAC layer enhancement only.
Do APs need to support high PHY rates for 802.11v to work well?
Higher PHY rates help maximize the benefits of 802.11v, but basic support is sufficient for functionality.
Can PHY rate be a metric in BSS transition decision-making?
Yes, 802.11v can use link quality and PHY metrics to recommend better APs.
How does 802.11v affect clients with poor PHY support?
It can still assist them by guiding connections to APs with better coverage or lower contention.
Is PHY rate information shared in 802.11v messages?
Not directly, but other metrics used in 802.11v may reflect PHY performance (e.g., RSSI, link quality).
What’s the overall impact of 802.11v on PHY rate efficiency?
It helps keep clients on optimal connections, maintaining higher average PHY rates across the network.
How is PHY rate stability influenced by 802.11v?
More stable connections result from better AP selection and reduced re-associations.
Topics in this section,
Modulation |
BW |
Tsc |
FSP=BW/Tsc |
Tdata=1/FSP |
GI=Tdata/4 |
Symbol=Tdata+GI |
1/Symbol |
Bits/Symbol |
Code rate |
Usable sc |
Rate (Mbps) |
|---|---|---|---|---|---|---|---|---|---|---|---|
BPSK |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
1 |
1/2 |
48 |
1.5 |
BPSK |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
1 |
3/4 |
48 |
2.25 |
QPSK |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
2 |
1/2 |
48 |
3 |
QPSK |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
2 |
3/4 |
48 |
4.5 |
16-QAM |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
4 |
1/2 |
48 |
6 |
16-QAM |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
4 |
3/4 |
48 |
9 |
64-QAM |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
6 |
2/3 |
48 |
12 |
64-QAM |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
6 |
3/4 |
48 |
13.5 |
256-QAM |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
8 |
3/4 |
48 |
18 |
256-QAM |
5 |
64 |
78.125 |
12.8 |
3.2 |
16 |
0.0625 |
8 |
5/6 |
48 |
20 |
BPSK |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
1 |
1/2 |
48 |
3 |
BPSK |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
1 |
3/4 |
48 |
4.5 |
QPSK |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
2 |
1/2 |
48 |
6 |
QPSK |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
2 |
3/4 |
48 |
9 |
16-QAM |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
4 |
1/2 |
48 |
12 |
16-QAM |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
4 |
3/4 |
48 |
18 |
64-QAM |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
6 |
2/3 |
48 |
24 |
64-QAM |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
6 |
3/4 |
48 |
27 |
256-QAM |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
8 |
3/4 |
48 |
36 |
256-QAM |
10 |
64 |
156.25 |
6.4 |
1.6 |
8 |
0.125 |
8 |
5/6 |
48 |
40 |
BPSK |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
1 |
1/2 |
48 |
6 |
BPSK |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
1 |
3/4 |
48 |
9 |
QPSK |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
2 |
1/2 |
48 |
12 |
QPSK |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
2 |
3/4 |
48 |
18 |
16-QAM |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
4 |
1/2 |
48 |
24 |
16-QAM |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
4 |
3/4 |
48 |
36 |
64-QAM |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
6 |
2/3 |
48 |
48 |
64-QAM |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
6 |
3/4 |
48 |
54 |
256-QAM |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
8 |
3/4 |
48 |
72 |
256-QAM |
20 |
64 |
312.5 |
3.2 |
0.8 |
4 |
0.25 |
8 |
5/6 |
48 |
80 |
Reference links