Cell selection of inactive state wireless device
A wireless device receives from a base station, first message(s) comprising configuration parameters of at least one of: logical channel(s); or radio bearer(s). The wireless device receives from the base station, a second message indicating an RRC state transition of the wireless device from an RRC connected state to an RRC inactive state. The wireless device being in the RRC inactive state selects a first cell based on the configuration parameters. The wireless device transmits to the base station, a random access preamble via the first cell.
1. A method comprising:
receiving, by a wireless device from a base station, at least one first message comprising configuration parameters of at least one logical channel associated with a first cell of a plurality of cells;
receiving, by the wireless device from the base station, a second message indicating a radio resource control (RRC) state transition of the wireless device from an RRC connected state to an RRC inactive state;
buffering, while in the RRC inactive state, packets in an uplink buffer corresponding to the at least one logical channel;
selecting, by the wireless device, the first cell for transmission of the packets, based on the configuration parameters of the at least one logical channel; and
transmitting, by the wireless device to the base station, a random access preamble via the first cell.
2. The method of claim 1 , wherein the configuration parameters further comprise at least one of:
a first cell identifier of the first cell;
at least one logical channel identifier of the at least one logical channel; or
at least one radio bearer identifier of at least one radio bearer.
3. The method of claim 1 , wherein the configuration parameters indicate association of the at least one logical channel or at least one radio bearer with the first cell.
4. The method of claim 1 , wherein the configuration parameters indicate association of the at least one logical channel or at least one radio bearer with at least one of:
one or more cell types; or
one or more frequency bands.
5. The method of claim 1 , wherein the configuration parameters further indicate association of a first network slice with at least one of:
the first cell;
one or more cell types; or
one or more frequency bands.
6. The method of claim 1 , wherein the at least one logical channel is associated with a first network slice.
7. The method of claim 1 , wherein the base station keeps a wireless device context of the wireless device at least during a time in which the wireless device is in the RRC inactive state, the wireless device context comprising at least one of:
a bearer configuration information;
a logical channel configuration information;
a packet data convergence protocol configuration information; or
a security information.
8. The method of claim 1 , wherein the selecting of the first cell is in response to the uplink buffer comprising one or more packets associated with at least one of:
the at least one logical channel; or
at least one radio bearer.
9. The method of claim 1 , wherein the transmitting of the random access preamble is in response to at least one of:
the uplink buffer comprising one or more packets;
a paging indication from the base station;
moving to a first radio access network notification area; or
moving to a first tracking area.
10. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive, from a base station, at least one first message comprising configuration parameters of: at least one logical channel associated with a first cell of a plurality of cells;
receive, from the base station, a second message indicating a radio resource control (RRC) state transition of the wireless device from an RRC connected state to an RRC inactive state;
buffer, while in the RRC inactive state, packets in an uplink buffer corresponding to the at least one logical channel;
select the first cell for transmission of the packets, based on the configuration parameters of the at least one logical channel; and
transmit, to the base station, a random access preamble via the first cell.
11. The wireless device of claim 10 , wherein the configuration parameters further comprise at least one of:
a first cell identifier of the first cell;
at least one logical channel identifier of the at least one logical channel; or
at least one radio bearer identifier of at least one radio bearer.
12. The wireless device of claim 10 , wherein the configuration parameters indicate association of the at least one logical channel or at least one radio bearer with the first cell.
13. The wireless device of claim 10 , wherein the configuration parameters indicate association of the at least one logical channel or at least one radio bearer with at least one of:
one or more cell types; or
one or more frequency bands.
14. The wireless device of claim 10 , wherein the configuration parameters further indicate association of a first network slice with at least one of:
the first cell;
one or more cell types; or
one or more frequency bands.
15. The wireless device of claim 10 , wherein the at least one logical channel is associated with a first network slice.
16. The wireless device of claim 10 , wherein the base station keeps a wireless device context of the wireless device at least during a time in which the wireless device is in the RRC inactive state, the wireless device context comprising at least one of:
a bearer configuration information;
a logical channel configuration information;
a packet data convergence protocol configuration information; or
a security information.
17. The wireless device of claim 10 , wherein the selecting of the first cell is in response to the uplink buffer comprising one or more packets associated with at least one of:
the at least one logical channel; or
at least one radio bearer.
18. The wireless device of claim 10 , wherein the transmitting of the random access preamble is in response to at least one of:
the uplink buffer comprising one or more packets;
a paging indication from the base station;
moving to a first radio access network notification area; or
moving to a first tracking area.
19. A method comprising:
transmitting, by a base station to a wireless device, at least one first message comprising configuration parameters of: at least one logical channel associated with a first cell of a plurality of cells;
transmitting, by the base station to the wireless device, a second message indicating a radio resource control (RRC) state transition of the wireless device from an RRC connected state to an RRC inactive state;
receiving, by the base station from the wireless device, a random access preamble via the first cell selected by the wireless device based on:
the wireless device buffering, while in the RRC inactive state, packets in an uplink buffer corresponding to the at least one logical channel; and
the wireless device selecting the first cell for transmission of the packets based on the configuration parameters of the at least one logical channel.
20. The method of claim 19 , wherein the configuration parameters further comprises at least one of:
a first cell identifier of the first cell;
at least one logical channel identifier of the at least one logical channel; or
at least one radio bearer identifier of at least one radio bearer.