CHANGING METHOD FROM SLEEP MODE TO AWAKE MODE IN WIFI SYSTEM
A method of changing from a Sleep mode to an Awake mode in a WIFI system includes (a) performing a TIM or DTIM inspection by using an auxiliary application, (b) performing Power-Down when no data to receive exists as a result of the inspection in the operation (a), and (c) changing to the Awake mode by using a main application when data to receive exists as a result of the inspection in the operation (a). According to the method of changing from a Sleep mode to an Awake mode in a WIFI system, power consumption may be minimized by dualizing an application and using an auxiliary application including only essential functions for TIM/DTIM inspection, separately from a main application.
1 . A method of changing from a Sleep mode to an Awake mode in a WIFI system, the method comprising:
(a) performing a TIM or DTIM inspection by using an auxiliary application;
(b) performing Power-Down when no data to receive exists as a result of the inspection in the operation (a); and
(c) changing to the Awake mode by using a main application when data to receive exists as a result of the inspection in the operation (a).
2 . The method of claim 1 , further comprising, before the operation (a):
waking up from a Sleep mode state by using RTC (Real Time Clock);
initializing memory to inspect TIM or DTIM; and
receiving a Beacon Frame.
3 . The method of claim 1 , wherein the auxiliary application and the main application are stored in different storage media.
4 . The method of claim 1 , wherein the auxiliary application is stored in ROM (Read Only Memory).
5 . The method of claim 1 , wherein a connectivity module, a LDO (Low-Dropout Regulator), a ROM, a CPU, and a SRAM are powered by the auxiliary application to perform the TIM or DTIM inspection.
6 . The method of claim 1 , further comprising:
loading and initializing the main application, between the operation (a) and the operation (c), when data to receive exists as a result of the inspection of the operation (a); and
initializing a SFlash and a QSPI of the WIFI system by using the main application.
7 . The method of claim 1 , wherein the operation (c) is performed by transmitting PS-Poll.
8 . A method of changing from a Sleep mode to an Awake mode in a WIFI system, the method comprising:
a first step for determining whether to maintain the Sleep mode, by using an auxiliary application; and
a second step for changing to the Awake mode, by using a main application.
9 . The method of claim 8 , wherein the auxiliary application performs a TIM or DTIM inspection.
10 . The method of claim 9 , wherein, in the first step, when data to receive exists by inspecting the TIM or DTIM by using the auxiliary application, the second step is performed.
11 . The method of claim 8 , wherein the auxiliary application and the main application are stored in different storage media.
12 . The method of claim 8 , wherein the auxiliary application is stored in ROM (Read Only Memory).
13 . The method of claim 9 , wherein a connectivity module, a LDO (Low-Dropout Regulator), a ROM, a CPU, and a SRAM are powered by the auxiliary application to perform the TIM or DTIM inspection.
14 . The method of claim 8 , wherein the second step is performed by transmitting PS-Poll.
15 . The method of claim 8 , wherein a QSPI and a SFlash are power off in the first step.