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Handover of multimode user equipment between radio access technologies for reduced call setup time

A wireless access technology and user equipment technology, applied in the field of mobile operating environment, can solve problems such as user equipment and service quality degradation

Active Publication Date: 2013-07-10
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long latency can significantly degrade user equipment and quality of service (QoS)

Method used

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  • Handover of multimode user equipment between radio access technologies for reduced call setup time
  • Handover of multimode user equipment between radio access technologies for reduced call setup time
  • Handover of multimode user equipment between radio access technologies for reduced call setup time

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Embodiment Construction

[0036] Many 3GPP2 operators are deploying 3GPP Long Term Evolution (LTE) moving forward. Initial deployments are expected to have more islands of LTE coverage with general Evolved High Rate Packet Data (eHRPD) coverage. Thus, a mobile user equipment (UE) camped on LTE would run out of LTE coverage and would be forced to move to eHRPD for continuing its service. In order to provide a good user experience, there needs to be minimal service discontinuity when moving from LTE to eHRPD.

[0037] The innovation relates to the operation of multimode mobile phones or user equipment (UE) in LTE networks. Multimode mobile phones are capable of communicating over 3GPP air interface technologies such as E-UTRAN (also known as LTE), UTRAN, GERAN (GSM / Edge Radio Access Network), and 3GPP2 air interface technologies such as 1xRTT and 1xEVDO. It is expected that multimode UEs that typically reside on LTE networks for packet data services (i.e., Evolved Packet Service System (EPS) services) ...

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Abstract

A communication system that employs Wireless Wide Area Networks (WWAN) of different Radio Access Technologies (RATs) ensures that simultaneous handover to 1*RTT and 1*EVDO is attempted only when warranted. The User Equipment (UE) that has multiple transceivers and is actively involved in a packet data session can be transferred from LTE to 1xEVDO. A criterion (e.g., cost, subscriber preference, operator preference, or network data traffic) can be used to determine when it is warranted to incur the setup delay time to perform simultaneous handover of both a voice connection and a packet data session. Conversely, if there is no active data session, generally the UE can be handed over only to 1*RTT for the voice / Short Message Service (SMS) call. In an aspect, the criterion can still dictate setting up simultaneously even for an active packet data session, such as for maintaining a time critical function of the device.

Description

technical field [0001] The present invention relates to mobile operating environments, and in particular, the present invention relates to selectively maintaining data packet session continuity when changing the coverage area of ​​a voice session using different radio access technologies. Background technique [0002] Wireless communication systems are widely deployed to provide various types of communication content, eg, voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing available system resources (eg, bandwidth and transmit power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems. [0003] Generally, a wireless multiple-access communication system is capable of supporting communicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00
CPCH04W36/0027H04W36/0022H04W36/144H04W88/06
Inventor S·拉马钱德兰
Owner QUALCOMM INC