METHOD OF WIRELESS COMMUNICATION, USER EQUIPMENT AND BASE-STATION FOR SMALL DATA TRANSMISSION, SDT

1 . A method of wireless communication comprising the following steps:

receiving downlink control information by a user equipment in an inactive state, wherein the downlink control information comprises a cyclic redundancy check scrambled by a radio network with at least one base-station and a paging-Radio Network Temporary Identifier;

monitoring a paging message with the user equipment in inactive state;

using the paging-Radio Network Temporary Identifier to decode reception of paging message; and

receiving with the user equipment more than one random-access channel resource configuration.

2 . The method according to claim 1 , further comprising receiving indication of priority of downlink data in the paging message with the user equipment.

3 . The method according to claim 2 , further comprising receiving indication of a group ID in the paging message with user equipment.

4 . The method according to claim 3 , further comprising receiving mapping between priority and the group ID and random-access channel resources configuration with the user equipment.

5 . The method according to claim 4 , further comprising mapping in the system information or dedicated RRC message with the user equipment.

6 . The method according to the claim 4 , further comprising selecting random-access channel resources corresponding to at least one of the priority and group ID indicated in the paging message with the user equipment.

7 . The method according to the claim 1 , further comprising configuring more than one random-access channel resources per Synchronization Signal Block with the base-station.

8 . The method according to the claim 7 , further comprising configuring configures a mapping of the random-access channel resources based on at least one option with the base-station.

9 . The method according to the claim 8 , wherein the option is a selection of priorities P 1 , P 2 and P 3 and

priority P 1 is linked to random-access channel resources 1 ,

priority P 2 is linked to random-access channel resources 2 , and

priority P 3 is linked to random-access channel resources 3 .

10 . The method according to the claim 8 , wherein the option is a selection of group ID 1 , group ID 2 and group ID 3 and

group ID 1 is linked to random-access channel resources 1 ,

group ID 2 is linked to random-access channel resources 2 , and

group ID 3 is linked to random-access channel resources 3 .

11 . The method according to the claim 8 , wherein the mapping is done through system Information or dedicated RRC message.

12 . The method according to the claim 8 , further comprising indicating with the base-station priorities P 1 , P 2 , P 3 and/or group ID 1 , group ID 1 , group ID 2 , group ID 3 in the paging message and selecting with the user equipment the random-access channel resources.

13 . The method according to the claim 8 , further comprising changing with the base-station change the number of random-access channel resources based on the overall load situation.

14 . A user equipment for wireless communication, comprising:

a memory; and one or more processors coupled to the memory, the memory and the one or more processors configured to:

receive, from a base-station, a paging communication while the user equipment is in an inactive mode or an idle mode;

transmit, to the base-station and based at least in part on receiving the paging communication, a first communication as part of a random access channel procedure; and

receive, from base-station and based at least in part on transmitting the first communication, a second communication that includes:

mobile-terminated downlink data, an indication of an uplink resource, and a radio resource control release message that causes the user equipment to remain in the inactive mode or the idle mode; while receiving the mobile-terminated downlink data; and transmit to a base-station while in the inactive mode or the idle mode, mobile-originated uplink data using the up link resource,

wherein the memory stores computer program instructions which, when executed by the microprocessor, configure the user equipment to:

receive downlink data;

monitor the paging message;

use a paging-Radio Network Temporary Identifier from the downlink data to decode the paging message; and

receive more than one random-access channel resource configuration in the downlink data.

15 . A base-station for wireless communication, comprising:

a memory; and one or more processors coupled to the memory, the memory and the one or more processors configured to:

transmit, to a user equipment, a paging communication while the user equipment is in an inactive mode or an idle mode;

receive, from the user equipment and based at least in part on transmitting the paging communication, a first communication as part of a random access channel procedure; and transmit to the user equipment and based at least in part on transmitting the first communication, a second communication that includes: mobile-terminated downlink data, an uplink resource that the user equipment is to use to transmit mobile-originated uplink data while in the inactive mode or the idle mode, and a radio resource control release message that causes the user equipment receive the mobile-terminated downlink (DL) data while in the inactive mode or the idle mode; and receive, from the user equipment and in the uplink resource, mobile-originated up link data, the user equipment is to transmit the mobile-originated uplink data while in the inactive mode or the idle mode,

wherein the memory stores computer program instructions which, when executed by the microprocessor, configure the user equipment via the base-station to implement

receiving the downlink data;

monitoring the paging message;

using the paging-Radio Network Temporary Identifier to decode reception of the paging message; and

receiving more than one random-access channel resource configuration in the downlink data.

16 . A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment, cause the one or more processors to:

receive, from base-station, a paging communication while the user equipment is in inactive mode or the idle mode;

transmit, to the base-station and based at least in part on receiving the paging communication, a first communication as part of a random access channel procedure; and receive, from the base-station (gNB) and based at least in part on transmitting the first communication, a second communication that includes:

mobile-terminated downlink data, an indication of an uplink resource, and a radio resource control release message that causes the user equipment to remain in the in inactive mode or the idle mode, while receiving the mobile-terminated downlink data; and transmit, to the base-station and while in inactive mode or the idle mode, mobile-originated uplink data using the uplink resource,

wherein the non-transitory computer-readable medium stores computer program instructions which, when executed by the microprocessor, configure the user equipment to implement the method of

receiving the downlink data;

monitoring the paging message;

using the paging-Radio Network Temporary Identifier to decode reception of the paging message; and

receiving more than one random-access channel resource configuration in the downlink data.

17 . A non-transitory computer-read able medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a base-station, cause the one or more processors to:

Transmit, to a user equipment, a paging communication while the user equipment is in inactive mode or the idle mode;

receive, from the user equipment and based at least in part on transmitting the paging communication, a first communication as part of a random access channel procedure; and transmit, to the user equipment and based at least in part on transmitting the first communication, a second communication that includes: mobile-terminated downlink data, an uplink-(UP) resource that the user equipment is to use to transmit mobile-originated uplink data while in inactive mode or the idle mode, and a radio resource control release message that causes the user equipment receive the mobile-terminated downlink (DL) data while in inactive mode (RRC_INACTIVE) or the idle mode (RRC_IDLE), and

receive, from the user equipment and in the uplink resource, mobile-originated uplink data, the user equipment is to transmit the mobile-originated uplink (UL) data while in inactive mode or the idle mode,

wherein the non-transitory computer-readable medium stores computer program instructions which, when executed by the microprocessor, configure the user equipment to implement the method of

receiving the downlink data;

monitoring the paging message;

using the paging-Radio Network Temporary Identifier to decode reception of the paging message; and

receiving more than one random-access channel resource configuration in the downlink data.