Sleep Mode Controlling Apparatus and Method in Cellular System
In a cellar system providing various packet services, sleep mode operation of a terminal in an idle state is controlled. The cellular system determines a discontinuous receiving (DRX) period according to a QoS of a packet service provided to the terminal, and runs the sleep mode according to the determined DRX period. The cellular system runs the sleep mode divided into shallow sleep duration and deep sleep duration. With this manner, a paging delay to the terminal and a power consumption of the terminal may be reduced.
1 . A method for controlling a terminal sleep mode in a cellular system, the terminal sleep mode controlling method comprising:
establishing a first sleep mode parameter corresponding to at least one of a quality of service (QoS) of a packet service provided to the terminal and a capability of the terminal;
transiting the terminal from an active state to an idle state; and
controlling the terminal to perform a paging channel monitoring duration whenever a time determined by the first sleep mode parameter is passed in the sleep mode.
2 . The sleep mode controlling method of claim 1 , wherein the first sleep mode parameter includes a parameter for determining a discontinuous reception (DRX) period, and the paging channel monitoring duration is performed whenever the DRX period is passed in the sleep mode.
3 . The sleep mode controlling method of claim 2 , wherein the controlling step includes establishing the sleep mode to be run by dividing the sleep mode into shallow sleep duration and deep sleep duration, the deep sleep duration performing the paging channel monitoring duration less often than the shallow sleep duration.
4 . The sleep mode controlling method of claim 3 , wherein the DRX period is increased during the shallow sleep duration each time a predetermined duration is passed.
5 . The sleep mode controlling method of claim 3 , wherein the first sleep mode parameter includes a DRX period increase value and a DRX period increase coefficient, and when the DRX period in the shallow sleep duration is increased from a first DRX period to a second DRX period, the second DRX period is determined by summing the first DRX period with a product of the DRX period increase value and the DRX period increase coefficient.
6 . The sleep mode controlling method of claim 5 , wherein the first sleep mode parameter includes a DRX period maintenance constant, the DRX period of the shallow sleep duration has the same value while the DRX period maintenance constant occurs, and the predetermined duration is given as a duration in which the DRX period maintenance constant is provided.
7 . The sleep mode controlling method of claim 5 , wherein the first sleep mode parameter further includes a DRX period minimum value for determining an initial DRX period of the shallow sleep duration.
8 . The sleep mode controlling method of claim 3 , wherein the first sleep mode parameter further includes the DRX period of the deep sleep duration.
9 . The sleep mode controlling method of claim 3 , wherein the first sleep mode parameter further includes a length of the shallow sleep duration, and the controlling step includes establishing the terminal to enter a deep sleep duration when there is no terminal-paging indicator provided to the terminal and there is no terminal-packet service start challenge before the shallow sleep duration ends.
10 . The sleep mode controlling method of claim 3 , wherein the establishing step includes establishing the length of the shallow sleep duration as ‘0’.
11 . The sleep mode controlling method of claim 1 , wherein the establishing step includes establishing the first sleep mode parameter considering at least one of the QoS of the packet service and the terminal quality by means of signaling with the terminal.
12 . The sleep mode controlling method of claim 1 , wherein the transiting step includes recognizing a packet service end by means of a signaling started from an application layer for the packet service, and canceling a session established for the packet service between the terminal and the cellular system.
13 . The sleep mode controlling method of claim 1 , further comprising establishing the second sleep mode parameter corresponding to the first sleep mode parameter according to the respective QoS of each packet service, and broadcasting the second sleep mode parameter included in the system information through a broadcasting channel.
14 . The sleep mode controlling method of claim 13 , wherein the second sleep mode parameter includes a staying threshold value for the transmit state, and the method further comprises:
determining whether there is packet data to be transmitted to the terminal in the transmit state or packet data to be transmitted by the terminal;
counting the staying time of the transmit state from a time point from which there is no packet data; and
transiting the terminal into a stand-by state when the staying time exceeds the staying threshold value,
wherein the terminal of the stand-by state performs a transition into the transmission state or a maintenance at the stand-by state according to the burst packet data characteristic thereby saving power.
15 . The sleep mode controlling method of claim 13 , wherein the second sleep mode parameter includes the staying threshold value of the idle state, and the transiting state includes transiting the terminal from the transmit state to the stand-by state, counting the staying time of the stand-by state while transiting to the stand-by state, and transiting the terminal into the idle state when the staying time exceeds the staying threshold value.
16 . A method for controlling a terminal in a cellular system providing various packet services to the terminal, the terminal controlling method comprising:
ending a session of a packet service provided to the terminal and transiting the terminal to an idle state;
controlling the terminal to be operated in a first sleep duration, and
controlling the terminal to be operated in a second sleep duration, the second sleep duration rarely monitoring a paging channel compared to the first sleep duration.
17 . The terminal controlling method of claim 16 , wherein during the first sleep duration, the terminal monitors the paging channel whenever a first period is passed, and the first period is increased as the first sleep duration is passed, and during the second sleep duration, the terminal monitors the paging channel whenever the second sleep duration which is longer than the first sleep duration, is passed, and the second sleep duration is performed after the first sleep duration ends.
18 . The terminal controlling method of claim 17 , wherein the transiting step includes establishing a sleep mode parameter considering at least one of the capability of the terminal and the QoS of the packet service provided to the terminal through signaling with the terminal, and informing the sleep mode parameter to the terminal, the sleep mode parameter including the first period, first period increase value information, a second period, and a length of the first sleep duration.
19 . The terminal controlling method of claim 17 , further comprising establishing a sleep mode parameter according to the respective QoS of various packet services, and broadcasting the sleep mode parameter through a broadcasting channel, wherein the sleep mode parameter includes the first period, first period increase value information, a second period, and a length of the first sleep duration.
20 . The terminal controlling method of claim 17 , wherein during the first sleep duration, the first period is increased after the paging channel monitoring is repeated a predetermined number of times.
21 . A sleep mode controlling apparatus of a cellular system providing various packet services to a terminal, the sleep mode controlling apparatus comprising:
a state controller for transiting the terminal from an active state to an idle state and controlling the terminal to perform a sleep mode operation in the idle state, and
a parameter setting unit for establishing at least one parameter necessary for the sleep mode operation based on a quality of service (QoS) of the packet service provided to the terminal when the terminal is transited into the idle state.
22 . The sleep mode controlling apparatus of claim 21 , wherein the parameter setting unit establishes the at least one parameter considering the terminal capability.
23 . The sleep mode controlling apparatus of claim 21 , wherein the at least one parameter includes a first parameter for a first sleep duration and a second parameter for a second sleep duration, and the terminal monitors a paging channel whenever a first period is passed during the first sleep duration, and monitors the paging channel whenever a second period, longer than the first period, is passed during the second sleep duration after the first sleep duration ends.
24 . The sleep mode controlling apparatus of claim 21 , wherein the at least one parameter includes an increase value of a first period and an increase coefficient of the first period, and when the first period is increased, the increased first period is determined by summing the previous first period and a product of the increase value and the increase coefficient.
25 . A base station of a cellular system comprising a controller for controlling a sleep mode of claim 21 .
26 . The base station of claim 25 , wherein the cellular system is a 3rd Generation Partnership Project (3GPP) system.
27 . A method for performing a sleep mode operation for a terminal provided various packet services from a cellular system, the sleep mode operation performing method comprising:
receiving a sleep mode parameter determined according to QoS of the packet service,
monitoring a paging channel each time a first period is passed, the first period being determined by the sleep mode parameter during a first sleep duration, and
monitoring the paging channel each time a second period is passed, the second period being determined by the sleep mode parameter during a second sleep duration after the established first sleep duration ends.
28 . The sleep mode operation performing method of claim 27 , wherein the sleep mode parameter is determined by signaling considering at least one of the capability of the terminal and the QoS of the packet service provided before the performing of the sleep mode operation to the terminal through the signaling with the cellular system.
29 . The sleep mode operation performing method of claim 27 , wherein the receiving step includes receiving the sleep mode parameter established according to the QoS of the various packet services through a broadcasting channel.
30 . The sleep mode operation performing method of claim 27 , wherein the first period is increased as the first sleep duration is passed, and the second period is longer than the first period.