US 2026/0040385 A1 · RADIO ACCESS TECHNOLOGY SWITCHING BASED ON NETWORK SUPPORT

Abstract

Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for efficiently falling back from one RAT to another RAT while maximizing the services available to a UE. When a request from a UE for communicating with a base station using one RAT is rejected by a network node for unexpected causes, the UE may use the techniques described herein to fallback to an appropriate RAT. For instance, after receiving a response indicating that a request including fifth generation (5G) parameters is rejected, the UE may drop the 5G parameters and fall back to fourth generation (4G), rather than falling back to second generation (2G) or third generation (3G). The unexpected causes may be preconfigured and may be determined based on a number of factors, including a subscription of the UE, a public land mobile network (PLMN) associated with the network node, etc.

Claims20

Dependent claims

An apparatus for wireless communication at a user equipment (UE) supporting a first radio access technology and a second radio access technology, comprising:

at least one processor;
and
memory coupled with the at least one processor, the memory storing instructions executable by the at least one processor to cause the UE to:
establish a connection with a network device according to the first radio access technology;
transmit, to a first network node via the connection associated with the first radio access technology, a first request associated with a bearer for a communication service, the first request comprising parameters associated with the second radio access technology;
receive, from the first network node, a response indicating that the first request is rejected, the response comprising a rejection cause that is one of a set of preconfigured causes;
and
transmit, to the first network node based at least in part on the response, a second request associated with the bearer for the communication service, the second request exclusive of the parameters associated with the second radio access technology.

5 more elements

An apparatus for wireless communication at a user equipment (UE) supporting a first radio access technology and a second radio access technology, comprising:

at least one processor;
and
memory coupled with the at least one processor, the memory storing instructions executable by the at least one processor to cause the UE to:
establish a first connection with a first network device according to the second radio access technology;
transmit, to a first network node via the first connection with the first network device, a first request associated with a bearer for a communication service, the first request comprising parameters associated with the second radio access technology;
receive, from the first network device, a response indicating that the first request is rejected, the response comprising a rejection cause that is one of a set of preconfigured causes;
establish, based at least in part on the response, a second connection with the first network device or a second network device according to the first radio access technology;
and
transmit, via the second connection with the first network device or the second network device, a second request associated with the bearer for the communication service to the first network node or a second network node, the second request exclusive of the parameters associated with the second radio access technology.

6 more elements

Dependencies are inferred from the claim text.

Radio access technology switching based on network support

Life of this patent

Radio access technology switching based on network support

Life of this patent

Abstract

Claims20