Methods, apparatus and systems for data transmission in a power efficient state
Methods, apparatus and systems for transmitting data in a power efficient sate are disclosed. In one embodiment, a method performed by a wireless communication device is disclosed. The method comprises: entering a power efficient state; and transmitting, to a wireless communication node, uplink data while being in the power efficient state.
1. A method performed by a wireless communication device, the method comprising:
entering a power efficient state, wherein the wireless communication device does not maintain an uplink synchronization in the power efficient state;
determining, whether data transmission in the power efficient state without state transition is allowed for each of a plurality of logical channels based on a respective one of a first plurality of indicators; and
transmitting, to a wireless communication node, uplink data while being in the power efficient state.
2. The method of claim 1 , wherein the power efficient state further comprises at least one of:
an inactive state;
an idle state; and
a state in which the wireless communication device does not monitor a physical downlink control channel (PDCCH) based on a cell radio network temporary identifier (C-RNTI).
3. The method of claim 1 , further comprising:
receiving, from the wireless communication node, configuration information related to the power efficient state, through at least one of: system information and a dedicated radio resource control (RRC) signaling.
4. The method of claim 3 , wherein the configuration information comprises information related to at least one of:
configuration for random access resources;
configuration for grant free transmission;
an indicator indicating whether data transmission in the power efficient state is supported and/or allowed;
configuration, for an area scope including a plurality of cells, regarding whether data transmission in the power efficient state is supported and/or allowed in each of the plurality of cells; and
configuration related to a selection between data transmission after state transition and data transmission in the power efficient state without state transition.
5. The method of claim 1 , further comprising determining that data transmission in the power efficient state without state transition is allowed based on at least one of:
a first indicator in system information to indicate whether data transmission in the power efficient state without state transition is allowed in a cell;
a second indicator in a dedicated signaling to indicate a cell list including at least one cell in which data transmission in the power efficient state without state transition is allowed;
a third indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a public land mobile network;
a fourth indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a tracking area;
a fifth indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a radio access network (RAN) notification area; or
a second plurality of indicators each of which corresponds to one of a plurality of cells in an area scope, wherein each of the second plurality of indicators indicates whether data transmission in the power efficient state is allowed in a corresponding cell.
6. The method of claim 1 , further comprising determining that data transmission in the power efficient state without state transition is allowed based on at least one of:
a separate indicator related to the power efficient state; and
a common indicator related to a plurality of power efficient states comprising the power efficient state.
7. The method of claim 1 , further comprising determining to maintain the power efficient state while transmitting the uplink data based on at least one of:
a second buffer size of the uplink data is less than a second threshold;
the uplink data is related to a type of service for which data transmission in the power efficient state without state transition is allowed or not allowed, wherein the type of service refers to at least one of: a data radio bearer (DRB), a protocol data unit (PDU) session, or a quality of service (QOS) flow;
a total buffer size of data related to at least one type of service for which the data transmission without state transition is allowed is less than a third threshold; and
an indication from the wireless communication node.
8. A method performed by a wireless communication node, the method comprising:
determining, whether data transmission in a power efficient state without state transition is allowed for each of a plurality of logical channels based on a respective one of a first plurality of indicators; and
receiving, from a wireless communication device, uplink data while the wireless communication device is in the power efficient state, wherein the wireless communication node configures the power efficient state such that the wireless communication device does not maintain an uplink synchronization in the power efficient state.
9. The method of claim 8 , wherein the power efficient state further comprises at least one of:
an inactive state;
an idle state; and
a state in which the wireless communication device does not monitor a physical downlink control channel (PDCCH) based on a cell radio network temporary identifier (C-RNTI).
10. The method of claim 8 , further comprising transmitting, to the wireless communication device, configuration information related to the power efficient state, through at least one of: system information and a dedicated radio resource control (RRC) signaling, wherein the configuration information comprises information related to at least one of:
configuration for random access resources;
configuration for grant free transmission;
an indicator indicating whether data transmission in the power efficient state is supported and/or allowed;
configuration, for an area scope including a plurality of cells, regarding whether data transmission in the power efficient state is supported and/or allowed in each of the plurality of cells; and
configuration related to a selection between data transmission after state transition and data transmission in the power efficient state without state transition.
11. The method of claim 8 , further comprising configuring that data transmission in the power efficient state without state transition is allowed based on at least one of:
a first indicator in system information to indicate whether data transmission in the power efficient state without state transition is allowed in a cell;
a second indicator in a dedicated signaling to indicate a cell list including at least one cell in which data transmission in the power efficient state without state transition is allowed;
a third indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a public land mobile network;
a fourth indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a tracking area;
a fifth indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a radio access network (RAN) notification area;
a second plurality of indicators each of which corresponds to one of a plurality of cells in an area scope, wherein each of the second plurality of indicators indicates whether data transmission in the power efficient state is allowed in a corresponding cell;
a separate indicator related to the power efficient state; and
a common indicator related to a plurality of power efficient states comprising the power efficient state.
12. The method of claim 8 , further comprising determining to keep the wireless communication device in the power efficient state during transmission of the uplink data based on at least one of:
a second buffer size of the uplink data is less than a second threshold;
the uplink data is related to a type of service for which data transmission in the power efficient state without state transition is allowed or not allowed, wherein the type of service refers to at least one of: a data radio bearer (DRB), a protocol data unit (PDU) session, or a quality of service (QOS) flow;
a total buffer size of data related to at least one type of service for which the data transmission without state transition is allowed is less than a third threshold; and
an indication to the wireless communication device.
13. The method of claim 8 , wherein the uplink data is received based on at least one of:
a grant free transmission; and
a payload of a random access process to the wireless communication node.
14. The method of claim 13 , wherein the payload refers to at least one of:
a payload transmitted after a preamble in a first step of a 2-step random access channel (RACH) process;
a medium access control (MAC) protocol data unit (PDU) transmitted in a message in a third step of a 4-step RACH process;
a payload transmitted after a preamble in a process similar to RACH; and
a payload transmitted together with a demodulation reference signal (DMRS).
15. A wireless communication device comprising:
at least one processor configured to place the wireless communication device in a power efficient state, wherein the wireless communication device does not maintain an uplink synchronization in the power efficient state, and wherein the at least one processor determines whether data transmission in the power efficient state without state transition is allowed for each of a plurality of logical channels based on a respective one of a first plurality of indicators; and
a transceiver configured to transmit to a wireless communication node uplink data while being in the power efficient state.
16. The wireless communication device of claim 15 , wherein the power efficient state further comprises at least one of:
an inactive state;
an idle state; and
a state in which the wireless communication device does not monitor a physical downlink control channel (PDCCH) based on a cell radio network temporary identifier (C-RNTI).
17. The wireless communication device of claim 15 , wherein the transceiver is further configured to receive, from the wireless communication node, configuration information related to the power efficient state, through at least one of: system information and a dedicated radio resource control (RRC) signaling.
18. The wireless communication device of claim 17 , wherein the configuration information comprises information related to at least one of:
configuration for random access resources;
configuration for grant free transmission;
an indicator indicating whether data transmission in the power efficient state is supported and/or allowed;
configuration, for an area scope including a plurality of cells, regarding whether data transmission in the power efficient state is supported and/or allowed in each of the plurality of cells; and
configuration related to a selection between data transmission after state transition and data transmission in the power efficient state without state transition.
19. The wireless communication device of claim 15 , wherein the at least one processor is further configured to determine that data transmission in the power efficient state without state transition is allowed based on at least one of:
a first indicator in system information to indicate whether data transmission in the power efficient state without state transition is allowed in a cell;
a second indicator in a dedicated signaling to indicate a cell list including at least one cell in which data transmission in the power efficient state without state transition is allowed;
a third indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a public land mobile network;
a fourth indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a tracking area;
a fifth indicator to indicate whether data transmission in the power efficient state without state transition is allowed in a radio access network (RAN) notification area;
a second plurality of indicators each of which corresponds to one of a plurality of cells in an area scope, wherein each of the second plurality of indicators indicates whether data transmission in the power efficient state is allowed in a corresponding cell;
a separate indicator related to the power efficient state; and
a common indicator related to a plurality of power efficient states comprising the power efficient state.
20. The wireless communication device of claim 15 , wherein the at least one processor is further configured to determine to maintain the power efficient state while transmitting the uplink data based on at least one of:
a second buffer size of the uplink data is less than a second threshold;
the uplink data is related to a type of service for which data transmission in the power efficient state without state transition is allowed or not allowed, wherein the type of service refers to at least one of: a data radio bearer (DRB), a protocol data unit (PDU) session, or a quality of service (QOS) flow;
a total buffer size of data related to at least one type of service for which the data transmission without state transition is allowed is less than a third threshold; and
an indication from the wireless communication node.