CDD: Requirement for WiFi QoS.
This is to ensure that on average the latency of low-latency mode
is not worse than that of high performance mode.
Bug: 124108091
Test: manual test with go/markdownr
Change-Id: I75c4152a11fad9a67e1a75ebbe89cd2cd87325c8
diff --git a/7_hardware-compatibility/7_4_data-connectivity.md b/7_hardware-compatibility/7_4_data-connectivity.md
index 7a68946..1830660 100644
--- a/7_hardware-compatibility/7_4_data-connectivity.md
+++ b/7_hardware-compatibility/7_4_data-connectivity.md
@@ -150,6 +150,24 @@
* SSID Parameter Set (0)
* DS Parameter Set (3)
+If device implementations include support for Wi-Fi power save mode as defined
+in IEEE 802.11 standard, they:
+
+* [C-3-1] MUST turn off Wi-Fi power save mode whenever an app acquires
+ `WIFI_MODE_FULL_HIGH_PERF` lock or `WIFI_MODE_FULL_LOW_LATENCY` lock
+ via [`WifiManager.createWifiLock()`](
+ https://developer.android.com/reference/android/net/wifi/WifiManager.html#createWifiLock\(int,%2520java.lang.String\))
+ and [`WifiManager.WifiLock.acquire()`](
+ https://developer.android.com/reference/android/net/wifi/WifiManager.WifiLock.html#acquire\(\))
+ APIs and the lock is active.
+* [C-3-2] The average round trip latency between the device
+ and an access point while the device is in a Wi-Fi Low Latency Lock
+ (`WIFI_MODE_FULL_LOW_LATENCY`) mode MUST be smaller than the
+ latency during a Wi-Fi High Perf Lock (`WIFI_MODE_FULL_HIGH_PERF`) mode.
+* [C-SR] Are STRONGLY RECOMMENDED to minimize Wi-Fi round trip latency
+ whenever a Low Latency Lock (`WIFI_MODE_FULL_LOW_LATENCY`) is acquired
+ and takes effect.
+
If device implementations support Wi-Fi and use Wi-Fi for location scanning,
they: