Flexible voice over WiFi (VoWiFi) handover to cellular
A flexible solution for handling WiFi to cellular (W2C) handover (e.g., for voice over WiFi (VoWiFi) or video calls) includes: determining, for a wireless network, at least one live conversation performance indicator; based on the at least one live conversation performance indicator, determining at least one W2C handover parameter of a set of W2C handover parameters, the set of W2C handover parameters including a first W2C handover parameter indicating a first trigger condition and a second W2C handover parameter indicating a second trigger condition; and transmitting, by the wireless network, to a user equipment (UE), the at least one W2C handover parameter. In some examples, the W2C handover parameters include a reference signal receive power (RSRP) threshold and/or a received signal strength indication (RSSI) threshold. In some examples, live conversation performance indicators may include a cellular call drop rate, a WiFi call drop rate, and a handover failure rate.
1 . A method of wireless communication, the method comprising:
determining, by a wireless network, a cellular call drop rate for a cellular radio access network (RAN) and a WiFi call drop rate for a WiFi access network operated independently from the cellular RAN, wherein a user equipment (UE) is communicatively coupled to both the cellular RAN and the WiFi access network;
selecting, by the wireless network based on the cellular call drop rate and the WiFi call drop rate, between an aggressive W2C handover trigger, a hybrid handover trigger, and a conservative W2C handover trigger for initiating a W2C handover of the UE, the aggressive W2C handover trigger initiating the W2C handover of the UE when a cellular signal measurement exceeds a first cellular threshold independent of a WiFi signal measurement, the conservative W2C handover trigger initiating the W2C handover of the UE when both the cellular signal measurement exceeds a second cellular threshold, that is lower than the first cellular threshold, and the WiFi signal measurement fails to exceed a WiFi threshold, the hybrid handover trigger initiating the W2C handover of the UE when either (i) the cellular signal measurement exceeds the first cellular threshold independent of the WiFi signal measurement or (ii) both the cellular signal measurement exceeds the second cellular threshold and the WiFi signal measurement fails to exceed the WiFi threshold; and
transmitting, by the wireless network, at least one W2C handover parameter to the UE, the at least one W2C parameter prompting the UE to initiate a handover of a dedicated bearer or quality of service (QoS) flow of the UE from the WiFi access network to the cellular RAN based on the selected W2C handover trigger.
2 . The method of claim 1 , wherein the at least one W2C handover parameter is specific to at least a cellular technology generation or a model of the UE.
3 . The method of claim 1 , wherein the first cellular threshold and the second cellular threshold indicate different reference signal receive power (RSRP) thresholds.
4 . The method of claim 1 , wherein the first cellular threshold and the second cellular threshold indicate different received signal strength indication (RSSI) thresholds.
5 . The method of claim 1 , wherein the first cellular threshold and the second cellular threshold are in-call thresholds.
6 . The method of claim 1 , wherein the WiFi threshold is an in-call threshold.
7 . A system for wireless communication, the system comprising:
a processor, and
a computer-readable medium storing instructions that are operative upon execution by the processor to:
determine, by a wireless network, a cellular call drop rate for a cellular radio access network (RAN) and a WiFi call drop rate for a WiFi access network operated independently from the cellular RAN, wherein a user equipment (UE) is communicatively coupled to both the cellular RAN and the WiFi access network;
select, by the wireless network based on the cellular call drop rate and the WiFi call drop rate, between an aggressive W2C handover trigger, a hybrid handover trigger, and a conservative W2C handover trigger for initiating a W2C handover of the UE, the aggressive W2C handover trigger initiating the W2C handover of the UE when a cellular signal measurement exceeds a first cellular threshold independent of a WiFi signal measurement, the conservative W2C handover trigger initiating the W2C handover of the UE when both the cellular signal measurement exceeds a second cellular threshold, that is lower than the first cellular threshold, and the WiFi signal measurement fails to exceed a WiFi threshold, the hybrid handover trigger initiating the W2C handover of the UE when either (i) the cellular signal measurement exceeds the first cellular threshold independent of the WiFi signal measurement or (ii) both the cellular signal measurement exceeds the second cellular threshold and the WiFi signal measurement fails to exceed the WiFi threshold; and
transmit, by the wireless network, at least one W2C handover parameter to the UE, the at least one W2C parameter prompting the UE to initiate a handover of a dedicated bearer or quality of service (QoS) flow of the UE from the WiFi access network to the cellular RAN based on the selected W2C handover trigger.
8 . The system of claim 7 , wherein the at least one W2C handover parameter is specific to at least a cellular technology generation or a model of the UE.
9 . The system of claim 7 , wherein the first cellular threshold and the second cellular threshold indicate different reference signal receive power (RSRP) thresholds.
10 . The system of claim 7 , wherein the first cellular threshold and the second cellular threshold indicate different received signal strength indication (RSSI) thresholds.
11 . The system of claim 7 , wherein the first cellular threshold and the second cellular threshold are in-call thresholds.
12 . The system of claim 7 , wherein the WiFi threshold is an in-call threshold.
13 . One or more computer storage devices having computer-executable instructions stored thereon, which, upon execution by a computer, cause the computer to perform operations comprising:
determining, by a wireless network, a cellular call drop rate for a cellular radio access network (RAN) and a WiFi call drop rate for a WiFi access network operated independently from the cellular RAN, wherein a user equipment (UE) is communicatively coupled to both the cellular RAN and the WiFi access network;
selecting, by the wireless network based on the cellular call drop rate and the WiFi call drop rate, between an aggressive W2C handover trigger, a hybrid handover trigger, and a conservative W2C handover trigger for initiating a W2C handover of the UE, the aggressive W2C handover trigger initiating the W2C handover of the UE when a cellular signal measurement exceeds a first cellular threshold independent of a WiFi signal measurement, the conservative W2C handover trigger initiating the W2C handover of the UE when both the cellular signal measurement exceeds a second cellular threshold, that is lower than the first cellular threshold, and the WiFi signal measurement fails to exceed a WiFi threshold, the hybrid handover trigger initiating the W2C handover of the UE when either (i) the cellular signal measurement exceeds the first cellular threshold independent of the WiFi signal measurement or (ii) both the cellular signal measurement exceeds the second cellular threshold and the WiFi signal measurement fails to exceed the WiFi threshold; and
transmitting, by the wireless network, at least one W2C handover parameter to the UE, the at least one W2C parameter prompting the UE to initiate a handover of a dedicated bearer or quality of service (QoS) flow of the UE from the WiFi access network to the cellular RAN based on the selected W2C handover trigger.
14 . The one or more computer storage devices of claim 13 , wherein the at least one W2C handover parameter is specific to at least a cellular technology generation or a model of the UE.
15 . The one or more computer storage devices of claim 13 , wherein the first cellular threshold and the second cellular threshold indicate different reference signal receive power (RSRP) thresholds.
16 . The one or more computer storage devices of claim 13 , wherein the first cellular threshold and the second cellular threshold indicate different received signal strength indication (RSSI) thresholds.
17 . The one or more computer storage devices of claim 13 , wherein the first cellular threshold and the second cellular threshold are in-call thresholds.
18 . The one or more computer storage devices of claim 13 , wherein the WiFi threshold is an in-call threshold.