Area update procedure(s) for radio system
View Patent ↗In one of its aspects the technology disclosed herein concerns a communications system comprising a radio access node ( 22 ) and a wireless terminal ( 26 ). The wireless terminal comprises receiver circuitry ( 40 ) and transmitter circuitry ( 44 ) as well as terminal processor circuitry ( 40 ). The receiver circuitry ( 40 ) is configured to receive, from the radio access node ( 22 ), a Radio Resource Control (RRC) message comprising information configuring a Radio Access Network-based (RAN-based) notification area. The terminal processor circuitry ( 40 ) is configured to initiate, in a case where the wireless terminal is in an inactive state, a RAN-based notification area update procedure upon the wireless terminal moving out of the configured RAN-based notification area. The information configuring the RAN-based notification area comprises one or more tracking area codes, each of the one or more tracking area codes being used to identify a tracking area.
1. A terminal apparatus that communicates with a base station apparatus, comprising:
receiver circuitry configured to
receive a first list during a registration procedure with a core network, the first list being used to identify an area for a tracking area update procedure for the core network, and
receive, from the base station apparatus, a Radio Resource Control (RRC) message comprising a second list, the second list being used to identify a Radio Access Network-based (RAN-based) notification area; and
processor circuitry configured to perform, in a case where the terminal apparatus is in RRC_INACTIVE state, the RAN-based notification area update procedure upon the terminal apparatus moving out of the RAN-based notification area, wherein
Access Stratum (AS) context is stored during the RRC_INACTIVE state, and
the first list and the second list are specified by a first set of one or more tracking area codes and a second set of one or more tracking area codes respectively.
2. The terminal apparatus of claim 1 , wherein
the receiver circuitry is configured to receive the RRC message comprising information used to instruct the terminal apparatus to transit from RRC_CONNECTED state to the RRC_INACTIVE state.
3. The terminal apparatus of claim 1 , wherein
the receiver circuitry is configured to receive a system information message comprising a tracking area code used to determine whether or not the terminal apparatus moves out of the RAN-based notification area.
4. The terminal apparatus of claim 3 , wherein
the processor circuitry is configured to use the tracking area code for the tracking area update for the core network.
5. A base station apparatus that communicates with a terminal apparatus, comprising:
transmitter circuitry configured to
transmit a first list during a registration procedure with a core network, the first list being used to identify an area for a tracking area update procedure for the core network, and
transmit, to the terminal apparatus, a Radio Resource Control (RRC) message comprising a second list, the second list being used to identify a Radio Access Network-based (RAN-based) notification area;
receiver circuitry configured to receive, from the terminal apparatus, a RAN-based notification area update upon the terminal apparatus moving out of the RAN-based notification area, in a case where the terminal apparatus is in RRC_INACTIVE state; and
processor circuitry configured to process the received RAN-based notification area update, wherein
Access Stratum (AS) context is stored during the RRC_INACTIVE state, and
the first and the second list are specified by a first set of one or more tracking area codes and a second set of one or more tracking area codes respectively.
6. The base station apparatus of claim 5 , wherein
the transmitter circuitry is configured to transmit the RRC message comprising information used to instruct the terminal apparatus to transit from RRC_CONNECTED state to the RRC_INACTIVE state.
7. The base station apparatus of claim 5 , wherein
the transmitter circuitry is configured to transmit a system information message comprising a tracking area code used by the terminal apparatus to determine whether or not the terminal apparatus moves out of the RAN-based notification area.
8. The base station apparatus of claim 7 , wherein
the receiver circuitry is configured to receive, from the terminal apparatus, the tracking area code for the tracking area update for the core network.
9. A method for a terminal apparatus that communicates with a base station apparatus, comprising:
receiving a first list during a registration period with a core network, the first list being used to identify an area for a tracking area update procedure for the core network;
receiving, from the base station apparatus, a Radio Resource Control (RRC) message comprising a second list, the second list being used to identify a Radio Access Network-based (RAN-based) notification area; and
performing, in a case where the terminal apparatus is in RRC_INACTIVE state, the RAN-based notification area update procedure upon the terminal apparatus moving out of the RAN-based notification area, wherein
Access Stratum (AS) context is stored during the RRC_INACTIVE state, and
the first and the second list are specified by a first set of one or more tracking area codes and a second set of one or more tracking area codes respectively.
10. The method of claim 9 , further comprising:
receiving the RRC message comprising information used to instruct the terminal apparatus to transit from RRC_CONNECTED state to the RRC_INACTIVE state.
11. The method of claim 9 , further comprising:
receiving a system information message comprising a tracking area code used to determine whether or not the terminal apparatus moves out of the RAN-based notification area.
12. The method of claim 11 , further comprising:
using the tracking area code for the tracking area update for the core network.
13. A method for a base station apparatus that communicates with a terminal apparatus, comprising:
transmitting a first list during a registration procedure with a core network, the first list being used to identify an area for a tracking area update procedure for the core network;
transmitting, to the terminal apparatus, a Radio Resource Control (RRC) message comprising a second list, the second list being used to identify a Radio Access Network-based (RAN-based) notification area;
receiving, from the terminal apparatus, a RAN-based notification area update upon the terminal apparatus moving out of the RAN-based notification area, in a case where the terminal apparatus is in RRC_INACTIVE state; and
processing the received RAN-based notification area update; wherein
Access Stratum (AS) context is stored during the RRC_INACTIVE state, and
the first and the second list are specified by a first set of one or more tracking area codes and a second set of one or more tracking area codes respectively.
14. The method of claim 13 , further comprising:
transmitting the RRC message comprising information used to instruct the terminal apparatus to transit from RRC_CONNECTED state to the RRC_INACTIVE state.
15. The method of claim 13 , further comprising:
transmitting a system information message comprising a tracking area code used by the terminal apparatus to determine whether or not the terminal apparatus moves out of the RAN-based notification area.
16. The method of claim 15 , further comprising:
receiving, from the terminal apparatus, the tracking area code for the tracking area update for the core network.