Direct link establishment in wireless networks
A wireless station utilizes available metrics to determine whether to request a direct link with another wireless station.
1. A method comprising:
measuring a signal to noise ratio of a signal received at a first wireless station, wherein the signal is transmitted to an access point from a second wireless station; and
making a request for establishment of a direct link between the first and second wireless stations based on the signal to noise ratio, wherein making a request for establishment of a direct link comprises making the request when:
1
RATE
(
SNR
)
<
1
r
1
+
1
r
2
where RATE(SNR) is a transmission rate estimated from the signal to noise ratio, r1 is a transmission rate between the first wireless station and the access point, and r2 is a transmission rate between the second wireless station and the access point.
2. The method of claim 1 wherein making a request for establishment of a direct link comprises making a request compliant with IEEE 802.11e direct link protocol.
3. A method comprising:
measuring a signal to noise ratio of a signal received at a first wireless station, wherein the signal is transmitted to an access point from a second wireless station; and
making a request for establishment of a direct link between the first and second wireless stations based on the signal to noise ratio, wherein making a request for establishment of a direct link further comprises making the request when:
1
RATE
(
SNR
)
≤
1
r
1
+
1
r
2
where RATE(SNR) is a transmission rate estimated from the signal to noise ratio, r1 is a transmission rate between the first wireless station and the access point, and r2 is a transmission rate between the second wireless station and the access point.
4. The method of claim 3 wherein making a request for establishment of a direct link comprises making a request compliant with IEEE 802.11e direct link protocol.
5. An apparatus with a machine accessible medium having instructions stored thereon that when accessed result in a machine performing:
measuring a signal to noise ratio of a signal received at a first wireless station, wherein the signal is transmitted to an access point from a second wireless station; and
making a request for establishment of a direct link between the first and second wireless stations based on the signal to noise ratio, wherein making a request for establishment of a direct link further comprises making the request when:
1
RATE
(
SNR
)
<
1
r
1
+
1
r
2
where RATE(SNR) is a transmission rate estimated from the signal to noise ratio, r1 is a transmission rate between the first wireless station and the access point, and r2 is a transmission rate between the second wireless station and the access point.
6. The apparatus of claim 5 wherein making a request for establishment of a direct link comprises making a request compliant with IEEE 802.11e direct link protocol.
7. An apparatus with a machine accessible medium having instructions stored thereon that when accessed result in a machine performing:
measuring a signal to noise ratio of a signal received at a first wireless station, wherein the signal is transmitted to an access point from a second wireless station; and
making a request for establishment of a direct link between the first and second wireless stations based on the signal to noise ratio, wherein making a request for establishment of a direct link further comprises making the request when:
1
RATE
(
SNR
)
≤
1
r
1
+
1
r
2
where RATL(SNR) is a transmission rate estimated from the signal to noise ratio, r1 is a transmission rate between the first wireless station and the access point, and r2 is a transmission rate between the second wireless station and the access point.
8. The apparatus of claim 7 wherein making a request for establishment of a direct link comprises making a request compliant with IEEE 802.11e direct link protocol.