Method for updating location of user equipment
View Patent ↗A method for updating location of a user equipment in a cellular system is disclosed. The method comprises the user equipment receiving route update radius information 220 . The user equipment further calculates a route update radius from the received route update radius information 230 by using a random number generated by the user equipment. The user equipment then transmits the calculated route update radius to a cellular network 240 . Alternatively, the method comprises the cellular network receiving a route update message from a user equipment 420 . The cellular network further calculates a route update radius 430 using a random number generated by the cellular network. The cellular network then unicasts the calculated route update radius to the user equipment 440.
1. A method for updating location of a user equipment comprising:
receiving route update radius information by the user equipment;
calculating a route update radius from the received route update radius information by using a random number generated by the user equipment; and
transmitting the route update radius by the user equipment to a cellular network.
2. The method of claim 1 , wherein the route update radius information comprises at least one of a maximum route update radius (Rmax), a lower unit of scaling (p), and a minimum route update radius (Rmin).
3. The method of claim 2 , wherein calculating further comprises:
selecting the random number such that the random number lies in an interval (p, 1);
multiplying the selected random number with the maximum route update radius (Rmax) to yield the route update radius.
4. The method of claim 2 , wherein calculating further comprises:
selecting the random number such that the random number lies in an interval (Rmin, Rmax);
setting the route update radius equal to the selected random number.
5. The method of claim 1 further comprising:
broadcasting, by the cellular network, the route update radius information;
receiving, by the cellular network, the route update radius ( 250 ); and
computing, by the cellular network, a routing area using the received route update radius.
6. The method of claim 5 , wherein the route update radius is conveyed in a route update message.
7. The method of claim 5 further comprising:
paging, by the cellular network, a plurality of cells in the computed routing area for identifying a cell where the user equipment currently resides.
8. The method of claim 1 , wherein the route update radius information comprises a set of possible route update radii (R 1 , R 2 , R 3 . . . Rn).
9. The method of claim 5 , wherein calculating further comprises:
selecting the random number such that the random number is an integer that lies in an interval (1, n), wherein the selected random number is denoted by a variable r;
choosing a possible route update radius found at a position r from within the set of possible route update radii; and
setting the route update radius equal to the chosen possible route update radius.
10. The method of claim 1 further comprising:
broadcasting, by the cellular network, the route update radius information;
receiving, by the cellular network, the route update radius; and
computing, by the cellular network, a routing area using the received route update radius.
11. The method of claim 10 , wherein the route update radius is conveyed in a route update message.