Communications among cells of different geographic coverage
This disclosure relates generally to wireless communications and, more particularly, to systems and methods for reselection or redirection among cells of different geographic coverage. In one embodiment, a method performed by a communication device includes: receiving configuration information from a first communication node, wherein the first communication node is part of a first cell or a first carrier; determining a second communication node based on the configuration information, wherein the second communication node is part of a second cell or a second carrier; and initializing a random access procedure or continuing with the random access procedure on the second communication node.
1. A method performed by a communication device, comprising:
receiving configuration information from a first communication node, wherein the first communication node is part of a first cell or a first carrier, wherein the configuration information comprises information related to a random access channel related configuration for a second cell or a second carrier;
determining a second communication node based on the configuration information, wherein the second communication node is part of the second cell or the second carrier; and
initializing a random access procedure or continuing with the random access procedure on the second communication node.
2. The method of claim 1 , wherein the initializing the random access procedure comprises one of:
sending a physical random access channel preamble to the second communication node; or
sending a physical random access channel preamble and payload to the second communication node.
3. The method of claim 1 , wherein continuing the random access procedure comprises one of:
transmitting a physical random access channel preamble to the first communication node and receiving a random access response from the second communication node;
transmitting the physical random access channel preamble and a payload to the first communication node and receiving the random access response from the second communication node;
retransmitting the physical random access channel preamble to the second communication node and receiving the random access response from the first communication node or the second communication node; or
retransmitting the physical random access channel preamble and the payload to the second communication node and receiving the random access response from the first communication node or the second communication node.
4. The method of claim 1 , wherein the initializing the random access procedure or continuing the random access procedure is based on a two-step random access procedure or a four-step random access procedure.
5. The method of claim 1 , wherein the configuration information comprises information related to at least one of:
a reselection configuration;
a redirection configuration;
a carrier selection configuration;
a bandwidth part (BWP) selection configuration;
a timing advance offset or a default timing advance for the cell or the carrier; or
a control resource set or a search space for the cell, the carrier, or a bandwidth part.
6. The method of claim 1 , further comprising determining the second communication node is based on at least one of:
a cell reselection configuration;
a cell redirection configuration
a determined set of uplink and downlink carriers; or
a failure type of a past random access procedure.
7. The method of claim 1 , further comprising:
selecting the second communication node when the random access procedure is initialized or when a physical random access channel preamble is transmitting.
8. The method of claim 1 , further comprising:
sending a subsequent random access preamble to the second communication node based on a failure to achieve random access with the second communication node from the random access procedure.
9. The method of claim 1 , further comprising:
initializing a subsequent random access procedure to the first communication node based on a failure to achieve random access with the second communication node.
10. The method of claim 1 , further comprising:
initializing a subsequent random access procedure to a third communication node based on a failure to achieve random access with the second communication node.
11. The method of claim 1 , further comprising:
sending a radio resource control setup request to the second communication node.
12. The method of claim 1 , wherein the first communication node has a longer round trip time relative to the communication device than the second communication node.
13. The method of claim 1 , wherein the first cell has a larger coverage area than that of the second cell.
14. A non-transitory computer-readable medium having stored thereon computer-executable instructions which when executed by at least one processor, causes the at least one processor to carry out the steps of:
receiving configuration information from a first communication node, wherein the first communication node is part of a first cell or a first carrier, wherein the configuration information comprises information related to a random access channel related configuration for a second cell or a second carrier;
determining a second communication node based on the configuration information, wherein the second communication node is part of the second cell or the second carrier; and
initializing a random access procedure or continuing with the random access procedure on the second communication node.
15. A communication device, comprising:
a receiver configured to:
receive configuration information from a first communication node, wherein the first communication node is part of a first cell or a first carrier, wherein the configuration information comprises information related to a random access channel related configuration for a second cell or a second carrier; and
a processor configured to:
determine a second communication node based on the configuration information, wherein the second communication node is part of the second cell or the second carrier, and
initialize a random access procedure or continue with the random access procedure on the second communication node.
16. The communication device of claim 15 , further comprising a transmitter configured to:
send a subsequent random access preamble to the second communication node based on a failure to achieve random access with the second communication node from the random access procedure.
17. The communication device of claim 15 , further comprising a transmitter configured to:
send a subsequent random access preamble to the first communication node based on a failure to achieve random access with the second communication node from the random access procedure.
18. The communication device of claim 15 , further comprising a transmitter configured to:
send a subsequent random access preamble to a third communication node based on a failure to achieve random access with the second communication node from the random access procedure.
19. The communication device of claim 15 , further comprising a transmitter configured to:
send a radio resource control setup request to the second communication node.
20. The communication device of claim 15 , wherein the first communication node has a longer round trip time relative to the communication device than the second communication node.