US-12621802-B2 - RAN paging and RAN area identifier exchange between base stations

US12621802B2US 12621802 B2US12621802 B2US 12621802B2US-12621802-B2

Abstract

A first base station receives from a second base station: a cell identifier of a cell of the second base station; and a second radio access network (RAN) area identifier of the cell. A packet for a wireless device in a radio resource control (RRC) inactive state is received. A RAN paging message is sent to the second base station in response to receiving the packet. The RAN paging message is based on a first RAN area identifier of the first base station being identical to the second RAN area identifier.

Inventors

Kyungmin Park
Esmael Hejazi Dinan

Assignees

SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20240305

Claims (14)

1 . A method for communication performed by a first base station in a wireless communication system, the method comprising: receiving, from a second base station, a message related to a setup of an Xn interface, the message including a cell identifier (ID) of the second base station; and initiating, by the first base station, a radio access network (RAN) paging procedure by sending a RAN paging message to the second base station to page a user equipment (UE) that is in a radio resource control (RRC) inactive state and that was last served by the first base station, wherein the RAN paging message comprises at least one of an identifier of the UE, paging discontinuous reception (DRX) information, or RAN paging area information, and wherein the RAN paging area information comprises at least one RAN area identifier or at least one cell identifier.
2 . The method of claim 1 , further comprising: identifying an event for paging the UE in the RRC inactive state, wherein the RAN paging message is transmitted to the second base station based on the event for paging the UE in the RRC inactive state.
3 . The method of claim 1 , further comprising: transmitting, to the second base station: the at least one cell identifier, or the at least one RAN area identifier.
4 . The method of claim 1 , further comprising: transmitting, to the UE, an RRC release message comprising the RAN paging area information, wherein the RRC release message indicates a state transition of the UE from an RRC connected state to the RRC inactive state.
5 . A method for communication by a second base station in a wireless communication system, the method comprising: transmitting, to a first base station, a message related to a setup of an Xn interface, the message including a cell identifier (ID) of the second base station; receiving, from the first base station, a radio access network (RAN) paging message for initiating a RAN paging procedure to page a user equipment (UE) that is in a radio resource control (RRC) inactive state and that was last served by the first base station; and paging the UE in the RRC inactive state based on receiving the RAN paging message, wherein the received RAN paging message comprises at least one of an identifier of the UE, paging discontinuous reception (DRX) information, or RAN paging area information, and wherein the RAN paging area information comprises at least one RAN area identifier or at least one cell identifier.
6 . The method of claim 5 , wherein the RAN paging message is received from the first base station based on an event for paging the UE in the RRC inactive state.
7 . The method of claim 5 , wherein the received RAN paging message indicates a state transition of the UE from the RRC inactivate state to an RRC idle state or an RRC connected state.
8 . The method of claim 5 , further comprising transmitting, to the UE, at least one paging message based on receiving the RAN paging message.
9 . The method of claim 5 , further comprising: receiving from the first base station: the at least one cell identifier, or the at least one RAN area identifier.
10 . The method of claim 5 , wherein the UE is in the RRC inactive state based on an RRC release message that indicates a state transition of the UE from an RRC connected state to the RRC inactive state, and wherein the RRC release message comprises the RAN paging area information related to paging.
11 . An apparatus of a first base station in a wireless communication system, the apparatus comprising: a transceiver; and at least one processor coupled to the transceiver, wherein the at least one processor is configured to: receive, from a second base station, a message related to a setup of an Xn interface, the message including a cell identifier (ID) of the second base station, and initiate a radio access network (RAN) paging procedure by sending a RAN paging message to the second base station to page a user equipment (UE) that is in a radio resource control (RRC) inactive state and that was last served by the first base station, wherein the RAN paging message comprises at least one of an identifier of the UE, paging discontinuous reception (DRX) information, or RAN paging area information, and wherein the RAN paging area information comprises at least one of RAN area identifier or at least one cell identifier.
12 . The apparatus of claim 11 , wherein the at least one processor is further configured to: identify an event for paging the UE in the RRC inactive state, wherein the RAN paging message is transmitted to the second base station based on the event for paging the UE in the RRC inactive state.
13 . The apparatus of claim 11 , wherein the at least one processor is further configured to: transmit, to the second base station: the at least one cell identifier, or the at least one RAN area identifier.
14 . The apparatus of claim 11 , wherein the at least one processor is further configured to: transmit, to the UE, an RRC release message comprising the RAN paging area information, wherein the RRC release message indicates a state transition of the UE from an RRC connected state to the RRC inactive state.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a continuation application of prior application Ser. No. 17/371,588, filed on Jul. 9, 2021, which is a continuation application of prior application Ser. No. 16/504,679, filed on Jul. 8, 2019, which has issued as U.S. Pat. No. 11,064,458 on Jul. 13, 2021, which is a continuation application of prior application Ser. No. 15/925,567, filed on Mar. 19, 2018, which has issued as U.S. Pat. No. 10,349,380 on Jul. 9, 2019 and is based on and claims priority under 35 U.S.C. § 119(e) of U.S. Provisional application Ser. No. 62/472,988, filed on Mar. 17, 2017, in the U.S. Patent and Trademark Office, the disclosure of which is incorporated by reference herein in its entirety. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings. FIG. 1 is a diagram of an example RAN architecture as per an aspect of an embodiment of the present disclosure. FIG. 2A is a diagram of an example user plane protocol stack as per an aspect of an embodiment of the present disclosure. FIG. 2B is a diagram of an example control plane protocol stack as per an aspect of an embodiment of the present disclosure. FIG. 3 is a diagram of an example wireless device and two base stations as per an aspect of an embodiment of the present disclosure. FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplink and downlink signal transmission as per an aspect of an embodiment of the present disclosure. FIG. 5A is a diagram of an example uplink channel mapping and example uplink physical signals as per an aspect of an embodiment of the present disclosure. FIG. 5B is a diagram of an example downlink channel mapping and example downlink physical signals as per an aspect of an embodiment of the present disclosure. FIG. 6 is a diagram depicting an example frame structure as per an aspect of an embodiment of the present disclosure. FIG. 7A and FIG. 7B are diagrams depicting example sets of OFDM subcarriers as per an aspect of an embodiment of the present disclosure. FIG. 8 is a diagram depicting example OFDM radio resources as per an aspect of an embodiment of the present disclosure. FIG. 9A, and FIG. 9B are diagrams of an example multi connectivity as per an aspect of an embodiment of the present disclosure. FIG. 10 is a diagram of an example random access procedure as per an aspect of an embodiment of the present disclosure. FIG. 11 is a structure of example MAC entities as per an aspect of an embodiment of the present disclosure. FIG. 12 is a diagram of an example RAN architecture as per an aspect of an embodiment of the present disclosure. FIG. 13 is a diagram of example RRC states as per an aspect of an embodiment of the present disclosure. FIG. 14 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 15 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 16 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 17 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 18 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 19 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 20 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 21 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 22 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 23 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 24 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 25 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 26 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 27 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 28 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 29 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 30 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 31 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 32 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 33 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 34 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 35 is an example flow diagram as per an aspect of an embodiment of the present disclosure. FIG. 36 is an example diagram as per an aspect of an embodiment of the present disclosure. FIG. 37 is an ex