The present disclosure relates generally to wireless communications and, more particularly, to the suspension of an active packet data session, for example, by voice preemption, in cellular communications handsets and resumption of the suspended packet session, and methods.
Wireless communications devices in packet networks, for example, CDMA 1x service networks, use a dormancy timer to prevent frequent re-origination of packet sessions from the mobile wireless communications devices within the duration of the dormancy timer. The dormancy timer normally begins when the wireless communications device enters the dormancy state some period after completion or suspension of a packet session. The dormancy timer allows the communications infrastructure to properly release system resources before the wireless communications device attempts to re-establish a packet session. In CDMA 1x and other packet networks, the duration of the dormancy timer is controlled by a system control message transmitted to the wireless communications device from the base station controller (BSC).
In cellular communications systems, incoming voice and messages among other events will preempt an active packet session. For example, voice pre-emption of packet data (VPAD) service allows the system to deliver a voice call to a wireless communications device actively engaged in a packet data call. Pre-emption of the packet session forces the wireless communications station into the dormancy state, during which the packet session is suspended, to permit setting up the voice call, messaging application, or other service or application that triggered suspension of the packet session.
Whenever a packet session is forced into the dormancy state, the dormancy timer begins and continues to run during the service or application associated with the event that caused suspension of the packet session. If the dormancy timer expires during the current active service or application, for example, during a voice call, the mobile wireless communications device will attempt to re-establish the packet session immediately upon completion of the voice call. The attempt to re-establish the packet session may fail however for lack of sufficient time for the network to release resources associated with the voice call. Similar issues may arise if the dormancy timer expires shortly after completion of the voice call. Failed packet session setups are undesirable, generally, and tend to interfere with other services and applications.
The various aspects, features and advantages of the disclosure will become more fully apparent to those having ordinary skill in the art upon careful consideration of the following Detailed Description thereof with the accompanying drawings described below.
The RAN 110 is also coupled to a Packet Data Serving Node (PDSN) entity 160 interconnecting the one or more base station controllers of the RAN to an IP packet network 170, like the Internet. In some embodiments, an authentication, authorization and accounting (AAA) entity 162 interconnects the PDSN entity 160 and the IP packet network 170. The exemplary IP packet network 170 is coupled to various other networks, for example, to a home IP network 180 and to a broker IP network 182 both of which include a corresponding AAA entity. The IP packet network 170 is also coupled to network 184 including a home agent (HA), which is a required component for mobile IP applications that run on some home or private networks. The exemplary CDMA network also includes an inter-working unit (IWU), among other infrastructure, which is well known to those having ordinary skill in the art. In
In the exemplary communications sequence 200 of
In some embodiments, the active packet session 220 is forced into a dormancy state by a dormancy-invoking event. In the exemplary sequence of
Generally, upon the occurrence of the packet session preempting event, the network communicates with the wireless communications device. In
In
In
In
In
While the present disclosure and what are presently considered to be the best modes thereof have been described in a manner establishing possession by the inventors and enabling those of ordinary skill in the art to make and use the same, it will be understood and appreciated that there are many equivalents to the exemplary embodiments disclosed herein and that modifications and variations may be made thereto without departing from the scope and spirit of the inventions, which are to be limited not by the exemplary embodiments but by the appended claims.
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