Packet zone reconnect control for an always-on mobile station
View Patent ↗A system and method of packet zone hysteresis for a mobile station is presented. A packet zone hysteresis reset timer is started whenever the mobile station sends or receives packet data and packet data exchange is determined to be incomplete. The packet zone hysteresis reset timer gives a time duration for which packet data exchange must be completed if packet zone hysteresis information is to be maintained. If the packet zone hysteresis reset timer expires before packet data exchange is completed, then the packet zone hysteresis information is cleared. If the mobile station moves to a different packet zone while packet data exchange is determined to be incomplete or packet data is going to be sent to which a response is expected, then the mobile station will perform a packet data reconnect. According to another aspect, upon detecting that a packet data exchange has completed, the mobile station re-activates packet zone hysteresis if it was de-activated from the packet data exchange.
1. A method in a mobile station having a packet zone list of previously visited packet data service zones comprising:
performing a packet data service reconnect upon moving into a new packet data service zone not on the packet zone list of previously visited packet data service zones;
before adding a new entry for the new packet data service zone to the packet zone list, setting a packet zone hysteresis timer for a most recently added packet data service zone entry in the packet zone list;
adding the new entry for the new packet data service zone to the packet zone list; and
maintaining previously added entries in the packet zone list notwithstanding receipt or transmission of packet data.
2. The method of claim 1 wherein maintaining entries in the packet zone list comprises:
refraining from deleting entries in the packet zone list.
3. The method of claim 1 further comprising:
at a later time after sending or receiving packet data, clearing the packet zone list.
4. The method of claim 1 wherein maintaining comprises:
clearing from the packet zone list an entry for a previously visited packet data service reconnect zone if its respective hysteresis timer expires.
5. The method of claim 1 further comprising:
starting a packet zone hysteresis activation timer upon sending or receiving packet data.
6. The method of claim 5 wherein the packet zone list is maintained notwithstanding the packet zone hysteresis activation timer.
7. The method of claim 1 further comprising:
upon detecting that the mobile station has moved from a first packet data service zone to a second packet data service zone while having an incomplete packet data exchange, clearing a previous entry for the second packet data service zone from the packet zone list if the mobile station has maintained the previous entry for the second packet data service reconnect zone in the packet zone list.
8. The method of claim 7 further comprising:
performing a packet data service reconnect in the second packet data service zone.
9. The method of claim 1 wherein the identification of each of the visited packet data service reconnect zones is represented by a respective SID/NID/PZID.
10. A mobile station comprising a packet zone list of previously visited packet data service zones and a packet zone hysteresis function adapted to implement a method comprising:
performing a packet data service reconnect upon moving into a new packet data service zone not on the packet zone list of previously visited packet data service zones;
before adding a new entry for the new packet data service zone to the packet zone list, setting a packet zone hysteresis timer for a most recently added packet data service zone entry in the packet zone list;
adding the new entry for the new packet data service zone to the packet zone list; and
maintaining previously added entries in the packet zone list notwithstanding receipt or transmission of packet data.
11. A computer readable medium encoded with computer executable instructions for implementing a method comprising:
performing a packet data service reconnect upon moving into a new packet data service zone not on the packet zone list of previously visited packet data service zones;
before adding a new entry for the new packet data service zone to the packet zone list, setting a packet zone hysteresis timer for the most recently added packet data service zone in the packet zone list;
adding the new entry for the new packet data service zone to the packet zone list; and
maintaining entries in the packet zone list notwithstanding receipt or transmission of packet data.