Random access procedures in next gen networks

1. An apparatus comprising:

a non-transitory memory including instructions to perform random access in a beam sweeping network having a cell, the network including a downlink sweeping subframe, an uplink sweeping subframe and a regular subframes; and

a processor operably coupled to the non-transitory memory and configured to execute the instructions of:

selecting an optimal downlink transmission beam transmitted by the cell during the downlink sweeping subframe,

determining an optimal downlink reception beam from the optimal downlink transmission beam,

determining a random access preamble and a physical random access channel (PRACH) resource associated with the optimal downlink transmission beam, and

transmitting, to a node, the selected random access preamble via the PRACH resource and an uplink transmission beam of the uplink subframe.

2. The apparatus of claim 1 , wherein the random access preamble is selected at random from a set of random access preambles associated with the optimal downlink transmission beam.

3. The apparatus of claim 2 , wherein the preamble successively includes a cyclic prefix period, Zadoff-Chu sequence period and a guard period.

4. The apparatus of claim 2 , wherein the set of random access preambles are partitioned among all beams.

5. The apparatus of claim 1 , wherein the processor is further configured to execute the instructions of:

monitoring a downlink control channel for a random access response (RAR), and

receiving the RAR from the node.

6. The apparatus of claim 1 , wherein

the PRACH resources are configured during uplink sweeping slots of the uplink subframe, and

a time resource of the PRACH resource is determined by the optimal downlink transmission beam.

7. The apparatus of claim 5 , wherein

the monitoring instruction proceeds for a period including one or more downlink sweeping subframes, and

the monitoring instruction includes identifying a RA-RNTI Random Access Radio Network Temporary Identifier of a RAR.

8. The apparatus of claim 7 , wherein the RAR includes a random access preamble identifier matching the transmitted random access preamble.

9. The apparatus of claim 1 , wherein the network is new radio (NR) and the cell is a NR cell.

10. An apparatus comprising:

a non-transitory memory including instructions to perform random access in a network; and

a processor operably coupled to the non-transitory memory and configured to execute the instructions of:

obtaining configuration parameters for a common physical random access channel (PRACH) resource on the network,

selecting a preamble from a cell based upon a device type and a service type,

transmitting, to a node, the selected preamble via the common PRACH resource,

monitoring a downlink control channel for a random access responses (RAR), and

receiving, via the node on the network, the RAR associated with the device type and service type of the selected preamble.

11. The apparatus of claim 10 , wherein a set of preambles including the selected preamble are partitioned into service-specific subsets.

12. The apparatus of claim 11 , wherein

the service-specific subsets are mMTC, eMBB or UR/LL or combinations thereof, and

the selected preamble is randomly selected from one of the service-specific subsets.

13. The apparatus of claim 10 , wherein the RAR includes a timing advance command representing a change in uplink timing relative to current uplink timing.

14. The apparatus of claim 10 , wherein the processor is further configured to execute the instructions of transmitting a message to establish a connection,

the message including an establishment cause information element selected from mMTCAccess, eMBBAccess, URLLAccess or combinations thereof.

15. An apparatus comprising:

a non-transitory memory including instructions to perform random access in a network; and

a processor operably coupled to the non-transitory memory and configured to execute the instructions of:

obtaining configuration parameters for a slice-specific physical random access channel (PRACH) resource on the network,

randomly selecting a preamble from a slice of the network based upon a device type and a service type,

transmitting, to a node, the randomly selected preamble via the slice-specific PRACH resource,

monitoring a downlink control channel for a random access response (RAR), and

receiving, via the node on the network, the RAR associated with the device type and service type of the selected preamble.

16. The apparatus of claim 15 , wherein

the PRACH resource is dedicated, and

the configuration parameters are obtained via an extended radio resource configuration common information element.

17. The apparatus of claim 15 , wherein

the preamble includes a cyclic prefix and a preamble sequence, and

the preamble sequence successively includes a cyclic prefix period, Zadoff-Chu sequence period and a guard period.

18. The apparatus of claim 15 , wherein

the cell includes contention preambles,

the monitoring instructions include determining a size of the RAR via a slice-specific response window size, and

the RAR includes a timing advance command indicating a change in uplink timing relative to current uplink timing.

19. The apparatus of claim 15 , wherein the processor is further configured to execute the instructions of:

transmitting a message including an establishment cause information element to establish a connection, and

receiving a contention resolution from the node.

20. An apparatus comprising:

a non-transitory memory including instructions to perform random access in a network; and

a processor operably coupled to the non-transitory memory and configured to execute the instructions of:

selecting a preamble from a cell based upon a device type and a service type,

transmitting the selected preamble and an accompanying grantless message,

monitoring a downlink control channel for a random access response (RAR),

receiving, from a node, a connection setup message and an uplink grant,

transmitting, via the received uplink grant, a status message on a connection, and

receiving, from the node, downlink data and control signaling.