System and method for mobility management in wireless networks
Some embodiments of the present disclosure relate to mobility management across multiple subsystems of wireless network devices, such as base-stations, drones, balloons, planes and satellites. In particular, the maintenance of user experiences across the subsystems is addressed. Aspects of the present disclosure relate to integrating terrestrial networks with non-terrestrial networks and establishing mechanisms for managing mobility of user devices as the devices travel from a service area defined by a connection with a terrestrial network to a service area defined by a connection with a non-terrestrial network or vice versa. Aspects of the present disclosure relate to establishing a format for an exchange of communication between user devices and transmit-receive points so that the mobility of the user device may be appropriately managed.
1 . A method of managing user equipment mobility in a radio access network, the method comprising:
communicating, from a first device, a message to a second device, wherein one of the first device and the second device is a non-terrestrial device and the other of the first device and the second device is a terrestrial device; and
providing, to a user equipment, configuration parameters related to access, by the user equipment, to the second device, the configuration parameters being distinct from a handover command.
2 . The method of claim 1 , further comprising receiving an acknowledgement of the message.
3 . The method of claim 1 , wherein the providing comprises broadcasting common configuration signaling.
4 . The method of claim 3 , wherein the user equipment is in an RRC_IDLE state or an RRC_INACTIVE state.
5 . The method of claim 4 , wherein the configuration parameters include one or more of common timing advance information, Doppler shift information, random access channel configuration information, position information for the second device, satellite ephemeris information, and satellite trajectory information.
6 . The method of claim 1 , wherein the providing comprises transmitting radio resource control signaling that is specific to the user equipment.
7 . The method of claim 6 , wherein the user equipment is in an RRC_CONNECTED state.
8 . The method of claim 7 , wherein the configuration parameters include one or more of fine timing advance information, Doppler shift information, random access channel configuration information, preamble information specific to the user equipment, satellite ephemeris information, and satellite trajectory information.
9 . The method of claim 7 , further comprising providing, to the user equipment, a Cell Radio Network Temporary Identifier.
10 . The method of claim 1 , further comprising receiving, from the second device, feedback based on a signal received, at the second device, from the user equipment.
11 . The method of claim 10 , further comprising:
receiving, from a further device, feedback based on a signal received, at the further device, from the user equipment;
selecting, from among the second device and the further device, and based on the feedback, a selected device; and
transmitting, to the selected device, an indication specifying that the selected device has been selected.
12 . A first device in a radio access network, the first device comprising:
a memory storing instructions; and
a processor configured, by executing the instructions, to:
communicate a message to a second device, wherein one of the first device and the second device is a non-terrestrial device and the other of the first device and the second device is a terrestrial device; and
provide, to a user equipment, configuration parameters related to access, by the user equipment, to the second device, the configuration parameters being distinct from a handover command.
13 . A method for a user equipment in a radio access network, the method comprising:
receiving, from a first device, a notification, the notification activating, at the user equipment, a cell reselection or initial cell selection procedure for transitioning between a terrestrial device and a non-terrestrial device;
detecting, during the cell reselection or initial cell selection procedure, a cell-defining synchronization signal block from a second device, wherein one of the first device and the second device is the non-terrestrial device and the other of the first device and the second device is the terrestrial device; and
receiving, from the second device, a system information message including initial access configuration parameters related to access, by the user equipment, to the second device.
14 . The method of claim 13 , wherein the receiving the system information message comprises receiving a physical downlink control channel scrambled with a common system information identifier scheduling a physical downlink shared channel carrying a system information block.
15 . The method of claim 14 , wherein the common system information identifier is a system information radio network temporary identifier.
16 . The method of claim 13 , wherein the receiving the notification comprises receiving a paging message.
17 . The method of claim 16 , wherein receiving the paging message comprises receiving a physical downlink control channel scrambled with a common paging identifier scheduling a physical downlink shared channel carrying the notification.
18 . The method of claim 17 , wherein the common paging identifier comprises a paging radio network temporary identifier.
19 . The method of claim 14 , wherein the system information block includes one or more of information about tracking, and information about radio access network areas.
20 . The method of claim 13 , further comprising, responsive to receiving the notification, activating measurements on a candidate cell defined by the second device.
21 . The method of claim 13 , further comprising receiving an assignment of a dedicated preamble.
22 . The method of claim 21 , further comprising initiating a contention-free random access procedure to the second device using the dedicated preamble.
23 . The method of claim 22 , wherein the notification includes one or more of an indication of a beam direction for transmitting the dedicated preamble to the second device, an indication of common configuration parameters for initiating a contention-based random access procedure to the second device, and an indication of user-equipment-specific configuration parameters for initiating a random access procedure to the second device.
24 . A user equipment in a radio access network, the user equipment comprising:
a memory storing instructions;
a processor configured, by executing the instructions, to:
receive, from a first device, a notification, the notification activating, at the user equipment, a cell reselection or initial cell selection procedure for transitioning between a terrestrial device and a non-terrestrial device;
detect, during the cell reselection or initial cell selection procedure, a cell-defining synchronization signal block from a second device, wherein one of the first device and the second device is the non-terrestrial device and the other of the first device and the second device is the terrestrial device; and
receive, from the second device, a system information message including initial access configuration parameters related to access, by the user equipment, to the second device.