Power saving

1 . A method, comprising:

transmitting, by a base station, one or more radio resource control messages comprising a power saving radio network temporary identifier (PS-RNTI) for a power saving (PS) mode and a downlink control information (DCI), wherein the DCI comprises a plurality of blocks and notifies power saving information;

transmitting, by the base station, a message indicating that each bit of a dormancy indication bitmap corresponds to at least one cell of one or more secondary cells;

transmitting, by the base station, based on the PS-RNTI, a first DCI comprising a first dormancy indication bitmap, wherein the message indicates a correspondence between a first bit of the first dormancy indication bitmap and at least one first cell of the one or more secondary cells; wherein a hybrid automatic repeat request (HARQ) process number of the first DCI is set to a predefined value to enable the PS mode of a wireless device;

transitioning, by the base station, the at least one first cell from a dormancy to a non-dormancy, based on the first bit having a first value;

transitioning, by the base station, at least one second cell, of the one or more secondary cells, from a non-dormancy to a dormancy, in response to:

the first dormancy indication bitmap comprising a second bit corresponding to the at least one second cell; and

the second bit having a second value different from the first value; and

transmitting, by the base station, a second DCI indicating disabling the PS mode.

2 . The method of claim 1 , wherein:

the dormancy of the at least one first cell is a power saving state of the at least one first cell; and

the non-dormancy of the at least one first cell is a non-power saving state of the at least one first cell.

3 . The method of claim 1 , further comprising:

receiving, by the base station, information indicating whether the power saving mode is supported or not by the wireless device.

4 . The method of claim 3 , wherein the information indicating whether the power saving mode is supported or not comprises at least one of following information: whether the wireless device supports a power saving mode in an RRC idle state, an RRC inactive state, or an RRC connected state.

5 . The method of claim 1 , wherein the second DCI is transmitted in a wake-up window, the wake-up window periodically occurs in a time domain according to one or more configuration parameters of the PS mode.

6 . The method of claim 1 , wherein the second DCI indicating disabling the PS mode based on at least one of following information: a first RNTI dedicated for the PS mode, or one or more fields of the second DCI.

7 . The method of claim 1 , wherein the message is a radio resource control message.

8 . The method of claim 1 , wherein the message comprises a primary cell configuration of a primary cell and one or more secondary cells configurations of the one or more secondary cells.

9 . The method of claim 1 , wherein a DCI format of the second DCI is different from a DCI format of the first DCI.

10 . The method of claim 1 , further comprising:

transmitting, by the base station, a third DCI comprising a second dormancy indication bitmap comprising the first bit; and

transitioning, by the base station, the at least one first cell from the non-dormancy to the dormancy based on the first bit having a second value different from the first value.

11 . A base station, comprising:

one or more processors; and a memory storing instructions that, when executed by the one or more processors, cause the base station to:

transmit one or more radio resource control messages comprising a power saving radio network temporary identifier (PS-RNTI) for a power saving (PS) mode, and a downlink control information (DCI), wherein the DCI comprises a plurality of blocks and notifies power saving information;

transmit a message indicating that each bit of a dormancy indication bitmap corresponds to at least one cell of one or more secondary cells;

transmit, based on the PS-RNTI, a first DCI comprising a first dormancy indication bitmap, wherein the message indicates a correspondence between a first bit of the first dormancy indication bitmap and at least one first cell of the one or more secondary cells; wherein a hybrid automatic repeat request (HARQ) process number of the first DCI is set to a predefined value to enable the PS mode of a wireless device;

transition the at least one first cell from a dormancy to a non-dormancy, based on the first bit having a first value;

transition at least one second cell, of the one or more secondary cells, from a non-dormancy to a dormancy, in response to:

the first dormancy indication bitmap comprising a second bit corresponding to the at least one second cell; and

the second bit having a second value different from the first value; and

transmit a second DCI indicating disabling the PS mode.

12 . The base station of claim 11 , wherein:

the dormancy of the at least one first cell is a power saving state of the at least one first cell; and

the non-dormancy of the at least one first cell is a non-power saving state of the at least one first cell.

13 . The base station of claim 11 , wherein the instructions further cause the base station to receive information indicating whether the power saving mode is supported or not by the wireless device.

14 . The base station of claim 13 , wherein information indicating whether the power saving mode is supported or not comprises at least one of following information: whether the wireless device supports a power saving mode in an RRC idle state, an RRC inactive state, or an RRC connected state.

15 . The base station of claim 11 , wherein the second DCI is transmitted in a wake-up window, the wake-up window periodically occurs in a time domain according to one or more configuration parameters of the PS mode.

16 . The base station of claim 11 , wherein the second DCI indicating disabling the PS mode based on at least one of following information: a first RNTI dedicated for the PS mode, or one or more fields of the second DCI.

17 . The base station of claim 11 , wherein the message is a radio resource control message.

18 . The base station of claim 11 , wherein the message comprises a primary cell configuration of a primary cell and one or more secondary cells configurations of the one or more secondary cells.

19 . The base station of claim 11 , wherein the instructions further cause the base station to:

transmit a third DCI comprising a second dormancy indication bitmap comprising the first bit; and

transition the at least one first cell from the non-dormancy to the dormancy based on the first bit having a second value different from the first value.

20 . A system, comprising:

a base station comprising:

one or more processors and a memory storing instructions that, when executed by the one or more processors, cause the base station to:

transmit, to a wireless device, one or more radio resource control messages comprising a power saving radio network temporary identifier (PS-RNTI) for a power saving (PS) mode, and a downlink control information (DCI), wherein the DCI comprises a plurality of blocks and notifies power saving information;

transmit, to the wireless device, a message indicating that each bit of a dormancy indication bitmap corresponds to at least one cell of one or more secondary cells;

transmit, based on the PS-RNTI, a first DCI comprising a first dormancy indication bitmap, wherein the message indicates a correspondence between a first bit of the first dormancy indication bitmap and at least one first cell of the one or more secondary cells; wherein a hybrid automatic repeat request (HARQ) process number of the first DCI being is set to a predefined value to enable the PS mode of a wireless device;

transition the at least one first cell from a dormancy to a non-dormancy, based on the first bit having a first value;

transmit a second DCI indicating disabling the PS mode; and

the wireless device comprising one or more processors and a memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive the one or more radio resource control messages comprising the PS-RNTI;

receive the message;

receive, based on the PS-RNTI, the first DCI;

determine the first DCI for indicating the PS mode based on the HARQ process number of the first DCI being set to the predefined value;

in response to determining the first DCI for indicating the PS mode, enable the PS mode;

transition the at least one first cell from a dormancy to a non-dormancy, based on the first bit having a first value;

transition at least one second cell, of the one or more secondary cells, from a non-dormancy to a dormancy, in response to:

the first dormancy indication bitmap comprising the second bit corresponding to the at least one second cell; and

the second bit having the second value different from the first value;

receive the second DCI indicating disabling the PS mode; and

in response to one or more fields of the second DCI being set to a predetermined value, switch from the PS mode to a normal access mode.