A User Equipment, UE, comprising: a processor; and a memory, wherein the memory stores instructions that cause the processor to: initiate, by a Radio Resource Control, RRC, layer, of the UE, an RRC connection reestablishment procedure; transmit, by the RRC layer, an RRC connection reestablishment request message; and receive, by the RRC layer, an RRC connection setup message in response to the RRC connection reestablishment request message, the RRC connection setup message being used to instruct the UE to establish a new RRC connection in the RRC connection reestablishment procedure; wherein the RRC connection reestablishment procedure includes an RRC connection establishment procedure, upon the UE receiving the RRC connection setup message, the instructions further cause the UE to perform, after fallback in the RRC connection reestablishment procedure, the RRC connection establishment procedure to: release, by the RRC layer, radio resources including associated Radio Link Control, RLC, entities, Packet Data Convergence Protocol, PDCP, entities and Service Data Adaptation Protocol, SDAP, for all established radio bearers which do not include a Signaling Radio Bearer 0, SRB0; indicate, by the RRC layer, an RRC connection reestablishment fallback indication to a Non-Access Stratum, NAS layer of the UE, and an RRC state of the UE, which is an RRC connected state, is unchanged in the RRC connection establishment procedure. a processor; and a memory, wherein the memory stores instructions that cause the processor to: initiate, by a Radio Resource Control, RRC, layer, of the UE, an RRC connection reestablishment procedure; transmit, by the RRC layer, an RRC connection reestablishment request message; and receive, by the RRC layer, an RRC connection setup message in response to the RRC connection reestablishment request message, the RRC connection setup message being used to instruct the UE to establish a new RRC connection in the RRC connection reestablishment procedure; wherein the RRC connection reestablishment procedure includes an RRC connection establishment procedure, upon the UE receiving the RRC connection setup message, the instructions further cause the UE to perform, after fallback in the RRC connection reestablishment procedure, the RRC connection establishment procedure to: release, by the RRC layer, radio resources including associated Radio Link Control, RLC, entities, Packet Data Convergence Protocol, PDCP, entities and Service Data Adaptation Protocol, SDAP, for all established radio bearers which do not include a Signaling Radio Bearer 0, SRB0; indicate, by the RRC layer, an RRC connection reestablishment fallback indication to a Non-Access Stratum, NAS layer of the UE, and an RRC state of the UE, which is an RRC connected state, is unchanged in the RRC connection establishment procedure. initiate, by a Radio Resource Control, RRC, layer, of the UE, an RRC connection reestablishment procedure; transmit, by the RRC layer, an RRC connection reestablishment request message; and receive, by the RRC layer, an RRC connection setup message in response to the RRC connection reestablishment request message, the RRC connection setup message being used to instruct the UE to establish a new RRC connection in the RRC connection reestablishment procedure; wherein the RRC connection reestablishment procedure includes an RRC connection establishment procedure, upon the UE receiving the RRC connection setup message, the instructions further cause the UE to perform, after fallback in the RRC connection reestablishment procedure, the RRC connection establishment procedure to: release, by the RRC layer, radio resources including associated Radio Link Control, RLC, entities, Packet Data Convergence Protocol, PDCP, entities and Service Data Adaptation Protocol, SDAP, for all established radio bearers which do not include a Signaling Radio Bearer 0, SRB0; indicate, by the RRC layer, an RRC connection reestablishment fallback indication to a Non-Access Stratum, NAS layer of the UE, and an RRC state of the UE, which is an RRC connected state, is unchanged in the RRC connection establishment procedure. release, by the RRC layer, radio resources including associated Radio Link Control, RLC, entities, Packet Data Convergence Protocol, PDCP, entities and Service Data Adaptation Protocol, SDAP, for all established radio bearers which do not include a Signaling Radio Bearer 0, SRB0; indicate, by the RRC layer, an RRC connection reestablishment fallback indication to a Non-Access Stratum, NAS layer of the UE, and an RRC state of the UE, which is an RRC connected state, is unchanged in the RRC connection establishment procedure.