Apparatus and method for power saving for cellular internet of things devices
The present disclosure relates to a communication method and system for converging a 5 th -Generation (5G) communication system for supporting higher data rates beyond a 4 th -Generation (4G) system with a technology for Internet of Things (IoT) or Cellular Internet of Things (CIoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. An operating method of a terminal located within a predetermined area in a wireless environment comprises transmitting, to a base station connected to a network, registration information for registering with the network, wherein the registration information includes information for indicating that the predetermined area is included in a coverage area of the base station, and communicating with the base station based on the registration information.
1. A method of operating a terminal in a wireless environment, the method comprising:
identifying a mobility class of the terminal from a limited mobility, a low mobility, and a high mobility;
transmitting, to a base station connected to a core network, first information indicating the limited mobility that is used for a registration of the terminal, and second information for determining at least one parameter for a network disconnected mode (NWDM), if the mobility class is the limited mobility;
receiving the at least one parameter for the NWDM that is determined based on the second information; and
controlling a connection with the base station as connected or disconnected according to a state of the NWDM that is identified based on the at least one parameter,
wherein the limited mobility is selected in case that the terminal is stationary in a cell of the base station regardless of a speed of the terminal,
wherein the low mobility indicates that the speed of the terminal is lower than a threshold,
wherein the high mobility indicates that the speed of the terminal is higher than the threshold,
wherein the connection with the base station is connected during an off-state of the NWDM and is disconnected during an on-state of the NWDM,
wherein the registration is maintained at the core network, while the terminal is disconnected with the base station according to the NWDM, and
wherein the first information causes the base station to configure the NWDM for the terminal.
2. The method of claim 1 , wherein the second information indicates at least one of a frequency of an uplink data transmission, a available resource in the terminal, or a clock/timing accuracy of the terminal, and
wherein the at least one parameter comprises at least one of a transmission period of an uplink data, a timer value for changing the state of the NWDM, or resource allocation for the uplink data.
3. The method of claim 1 , wherein the controlling of the connection with the base station comprising:
transitioning from the on-state of the NWDM where the terminal is disconnected with the base station to the off-state of the NWDM where the terminal is connected with the base station, in response to an expiry of a timer that starts in response to entering the off-state of the NWDM.
4. The method of claim 1 , wherein the controlling of the connection with the base station comprising:
transmitting, to the base station, uplink data during an off-state of the NWDM where the terminal is connected with the base station, using resources,
wherein the resources are identified by the at least one parameter, or are allocated by a request of the terminal after entering the off-state.
5. The method of claim 1 , herein the controlling of the connection with the base station comprising:
transmitting, to the base station, uplink data during the off-state of the NWDM where the terminal is connected with the base station, using a random access channel (RACH).
6. The method of claim 1 , wherein the controlling of the connection with the base station comprising:
deactivating a receiver of the terminal during the on-state of the NWDM; and
activating the receiver of the terminal during the off-state of the NWDM.
7. The method of claim 1 , wherein the controlling of the connection with the base station comprising:
transitioning from the on-state of the NWDM where the terminal is disconnected with the base station to the off-state of the NWDM where the terminal is connected with the base station, without an authentication and a context establishment.
8. The method of claim 1 , wherein the controlling of the connection with the base station comprising:
transitioning from the on-state of the NWDM where the terminal is disconnected with the base station to the off-state of the NWDM where the terminal is connected with the base station, without performing a location update.
9. A base station in a wireless environment, the base station comprising:
a transceiver; and
at least one processor operably coupled to the transceiver, wherein the at least one processor is configured to:
receive, from a terminal, first information indicating a limited mobility that is used for a registration of the terminal, and second information for determining at least one parameter for a network disconnected mode (NWDM), if the terminal identifies a mobility class of the terminal from the limited mobility, a low mobility, and a high mobility, and
transmit the at least one parameter for the NWDM that is determined based on the second information,
wherein the limited mobility is selected when the terminal is stationary in a cell of the base station regardless of a speed of the terminal,
wherein the low mobility indicates that that the speed of the terminal is lower than a threshold,
wherein the high mobility indicates that the speed of the terminal is higher than the threshold,
wherein a connection with the terminal is controlled as connected or disconnected according to a state of the NWDM that is identified based on the at least one parameter,
wherein the connection with the base station is connected during an off-state of the NWDM and is disconnected during an on-state of the NWDM,
wherein the registration is maintained at a core network, while the terminal is disconnected with the base station according to the NWDM,
wherein the first information causes the base station to configure the NWDM for the terminal.
10. The base station of claim 9 , wherein the second information indicates at least one of a frequency of an uplink data transmission, a available resource in the terminal, or a clock/timing accuracy of the terminal, and
wherein the at least one parameter comprises at least one of a transmission period of an uplink data, a timer value for changing the state of the NWDM, or resource allocation for the uplink data.
11. The base station of claim 9 , wherein the at least one processor is further configured to:
receive, from the terminal, uplink data during an off-state of the NWDM where the terminal is connected with the base station, using resources,
wherein the resources are identified by the at least one parameter, or are allocated by a request of the terminal after entering the off-state.
12. The base station of claim 9 , wherein the at least one processor is further configured to:
receive, from the terminal, uplink data during an off-state of the NWDM where the terminal is connected with the base station, using a random access channel (RACH).
13. A terminal in a wireless environment, the terminal comprising:
a transceiver; and
at least one processor operably coupled to the transceiver, wherein the at least one processor is configured to:
identify a mobility class of the terminal from a limited mobility, a low mobility, and a high mobility,
transmit, to a base station connected to a core network, first information indicating the limited mobility that is used for a registration of the terminal, and second information for determining at least one parameter for a network disconnected mode (NWDM), if the mobility class is the limited mobility,
receive the at least one parameter for the NWDM that is determined based on the second information, and
control a connection with the base station as connected or disconnected according to a state of the NWDM that is identified based on the at least one parameter,
wherein the limited mobility is selected in case that the terminal is stationary in a cell of the base station regardless of a speed of the terminal,
wherein the low mobility indicates that the speed of the terminal is lower than a threshold,
wherein the high mobility indicates that the speed of the terminal is higher than the threshold,
wherein the connection with the base station is connected during an off-state of the NWDM and is disconnected during an on-state of the NWDM,
wherein the registration is maintained at the core network, while the terminal is disconnected with the base station according to the NWDM, and
wherein the first information causes the base station to configure the NWDM for the terminal.
14. The terminal of claim 13 , wherein the second information indicates at least one of a frequency of an uplink data transmission, a available resource in the terminal, or a clock/timing accuracy of the terminal, and
wherein the at least one parameter comprises at least one of a transmission period of an uplink data, a timer value for changing the state of the NWDM, or resource allocation for the uplink data.
15. The terminal of claim 13 , wherein the at least one processor is further configured to:
transition from an on-state of the NWDM where the terminal is disconnected with the base station to an off-state of the NWDM where the terminal is connected with the base station, in response to an expiry of a timer that starts in response to entering the off-state of the NWDM.
16. The terminal of claim 13 , wherein the at least one processor is further configured to:
deactivate the transceiver during the on-state of the NWDM; and
activate the transceiver during the off-state of the NWDM.
17. The terminal of claim 13 , wherein the at least one processor is further configured to:
transition from the on-state of the NWDM where the terminal is disconnected with the base station to the off-state of the NWDM where the terminal is connected with the base station, without an authentication and a context establishment.
18. The terminal of claim 13 , wherein the at least one processor is further configured to:
transition from the on-state of the NWDM where the terminal is disconnected with the base station to the off-state of the NWDM where the terminal is connected with the base station, without performing a location update.