Apparatuses of user equipment (UEs) for end-to-end coordination of voice over cellular data network communications. An apparatus of a UE includes one or more data storage devices and one or more processors. The one or more data storage devices are configured to store delay budget information pertaining to end-to-end delivery of a real-time transport protocol (RTP) stream sent from a remote UE to the UE. The one or more processors are configured to generate an application layer message including the delay budget information, the application layer message to be transmitted to the remote UE to enable the remote UE to request, from a cellular base station servicing the remote UE, additional air interface delay based on the delay budget information.

According to one configuration, a mobile communication device receives first communications over a first wireless communication link from a first wireless network (which potentially supports data only communications). The first communications received over the first wireless network can include a message indicating a pending incoming call available over a second wireless network (which potentially supports voice/call communications). In response to receiving the message indicating the pending incoming call, the mobile communication device is operated to receive second communications (such as a paging signal) from over the second wireless network. For example, the mobile communication device listens for a paging signal from the second wireless network further indicating the pending incoming call. If desired, an operator of the mobile communication device can accept the incoming call via a second wireless communication link to the second wireless network.

A VoLTE communication method and a base station thereof are disclosed. The method includes: receiving a VoLTE communication request sent by a calling terminal; determining and sending a first suggestion complying with the VoLTE communication carried out by the calling terminal to a network side, the first suggestion including a first suggested speech coding mode and a corresponding code rate thereof; receiving from the network side a final speech coding mode and a corresponding code rate that are determined based on the first suggested speech coding mode and the corresponding code rate; and sending the final speech coding mode and the corresponding code rate to the calling terminal, such that the speech coding mode and the corresponding cod rate may be adjusted synchronously on the both side of the VoLTE communication.

This disclosure relates to a mobile device, comprising: a receiver configured to receive a radio signal comprising transmissions from a plurality of radio cells; and a processor configured to derive second information from the received radio signal, the second information indicating at least one neighboring radio cell, wherein the processor is configured to initiate a radio cell selection based on the second information if the second information indicates at least one neighboring radio cell configured for the first RAT.

The present invention discloses a single radio voice call continuity handover method and apparatus. An MME records whether a bearer deletion request message sent by a gateway device is received, and if the MME determines that the bearer deletion request message is received, the MME does not send a bearer deletion instruction message to the gateway device, and does not delete a local voice service bearer resource. Therefore, after the MME performs voice service bearer deletion on an IMS side, the MME does not perform voice service bearer deletion on an EPS side, thereby avoiding a conflict in an SRVCC process. Alternatively, when a reason for session termination is SRVCC handover, a PCRF does not send a re-authentication request message to the gateway device, that is, the gateway device does not perform a voice bearer deletion process on the IMS side, thereby avoiding a conflict in an SRVCC process.

The present invention relates to the field of mobile communications technologies, and in particular, to an information transmission method, an information modification method, and apparatuses, so as to solve a technical problem of voice transmission interruption in an SRVCC scenario in the prior art. In embodiments of the present invention, when a UE is in a connected state, a base station is notified of an SRVCC capability of the UE in real time, so that the base station can update the locally stored SRVCC capability of the UE in real time, and then determine, according to an actual situation, whether to initiate an SRVCC process, thereby ensuring a success rate of the SRVCC process and avoiding a possible phenomenon of call drop as far as possible.

A voice roaming method, a mobility management network element, and an access network element are provided. When determining that a terminal is a roaming terminal and supports a voice over Long Term Evolution (VoLTE) service in a roaming network, the mobility management network element prohibits a single radio voice call continuity (SRVCC) function of the terminal, and notifies the access network element, so that the access network element prohibits triggering an SRVCC procedure for the terminal.

Embodiments include methods for a first network node (e.g., eNB) of a wireless network (e.g., EPS). Such methods include sending (610), to a second network node of the wireless network, a request to retrieve context information associated with a user equipment (UE) that has been or is being handed over from the second network node to the first network node. Such methods include receiving (620) the context information associated with the UE from the second network node. Specifically, the context information includes an indication of whether the UE has an active IP Multimedia System (IMS) voice call that was subject to a first inter-system handover from a 5G System (5GS) to the wireless network. Other embodiments include complementary methods for the second network node, as well as network nodes configured to perform such methods.

The disclosed technology is directed towards preventing a handover of a Wi-Fi call to a Fifth Generation (5G) standalone cellular network. In one alternative, a 5G standalone usage setting is disabled on a mobile device when Wi-Fi calling is enabled on the mobile device. In another alternative, a 5G standalone usage setting is disabled on a mobile device when Wi-Fi calling is enabled on the mobile device and the mobile device is connected to a Wi-Fi network, which facilitates camping on a 5G standalone network when the mobile device is not connected to a Wi-Fi network. In yet another alternative, a 5G standalone usage setting is disabled on a mobile device when an evolved packet data gateway (ePDG) tunnel is set up on the mobile device, which similarly facilitates camping on a 5G standalone network when the ePDG tunnel is torn down.

A computer-readable storage medium stores instructions to configure a UE for radio resource management (RRM) measurements in a 5G NR. network, and to cause the UE to perform operations. The operations include decoding RRC signaling. The RRC signaling includes system information associated with an inter-RAT cell of a. target base station. The system information includes an indicator for support of enhanced RRM measurements by the inter-RAT cell. Configuration information from a. source base station is decoded. The configuration information includes a handover instruction for performing a handover from the source base station to the target base station. A determination is made whether to perform the enhanced RRM measurements and the handover based on the indicator.