Base station selection method for heterogeneous overlay networks
A base station selection method is disclosed to select between two base stations for connecting a mobile device in a wireless neighborhood to a network. The wireless neighborhood may support multiple carriers and multiple radio access technologies. The base station selection method performs mobility estimation of the mobile device, where possible, to perform cell selection, but is also capable of performing cell selection without knowing the mobility of the device. Considerations such as the battery level of the mobile device, traffic demands of the network, and load balancing of network resources are used to make optimal selections for the mobile device as it travels through the wireless neighborhood.
1. A method to select a serving base station of a mobile device traveling through a wireless neighborhood, the serving base station to be connected to a network, the method comprising:
checking, by a server system operable in the wireless neighborhood, the battery level of the mobile device, wherein the serving base station of the mobile device is either a macro cell that supports high-mobility devices or a pico cell that provides low-mobility coverage on the network;
if the battery level does not exceed a predetermined threshold, selecting, by the server system, the pico cell as the serving base station of the mobile device, wherein the pico cell is the nearest to the mobile device of a plurality of pico cells in the wireless neighborhood;
if the battery level does exceed the predetermined threshold, determining, by the server system, whether the mobile device is mostly receiving downlink transactions from or sending uplink transactions to the serving base station; and
if the mobile device is mostly receiving downlink transactions from the serving base station, selecting, by the server system, the marco cell as the serving base station of the mobile device, wherein the macro cell is the nearest to the mobile device of a plurality of macro in the wireless neighborhood.
2. The method of claim 1 , further comprising:
if the mobile device is mostly sending uplink transactions to the serving base station, selecting, by the server system, the pico cell as the serving base station of the mobile device in the wireless neighborhood.
3. The method of claim 1 , further comprising:
if the plurality of macro cells uses a first radio access technology (RAT) and the plurality of pico cells uses a second RAT; and
if the mobile device has both the first RAT and the second RAT simultaneously enabled, then the mobile device directs traffic with strong quality of service requirements onto the nearest macro cell employing the first RAT while directing best-effort traffic onto the nearest pico cell employing the second RAT, such that the mobile device maintains two concurrent connections to two different base stations, wherein the dual connection of the mobile device to two different RATs prolongs the battery life of the mobile device.
4. The method of claim 1 , further comprising:
if the plurality of macro cells uses a first radio access technology (RAT) and the plurality of pico cells uses a second RAT; and
if the mobile device has both the first RAT and the second RATs simultaneously enabled, then
analyzing, by the server system, the network based on mobility, traffic pattern, and load balancing; and
selecting, by the server system, the nearest macro cell employing the first RAT as the serving base station of the mobile device based on the network analysis.
5. A method to select a serving base station of a mobile device traveling through a wireless neighborhood, the serving base station to be connected to a network, the method comprising:
checking, by the mobile device, the battery level of the mobile device, wherein the serving base station of the mobile device is either a macro cell that supports high-mobility devices or a pico cell that provides low-mobility coverage on the network;
if the battery level does not exceed a predetermined threshold, selecting, by the mobile device, the pico cell as the serving base station of the mobile device, wherein the pico cell is the nearest to the mobile device of a plurality of pico cells in the wireless neighborhood;
if the battery level does exceed the predetermined threshold, determining, by the mobile device, whether the mobile device is mostly receiving downlink transactions from or sending uplink transactions to the serving base station; and
if the mobile device is mostly receiving downlink transactions from the serving base station, selecting, by the mobile device, the macro cell as the serving base station of the mobile device, wherein the macro cell is the nearest to the mobile device of a plurality of macro cells in the wireless neighborhood.
6. The method of claim 5 , further comprising:
if the mobile device is mostly sending uplink transactions to the serving base station, selecting, by the mobile device, the pico cell as the serving base station of the mobile device in the wireless neighborhood.
7. The method of claim 5 , further comprising:
if the plurality of macro cells uses a first radio access technology (RAT) and the plurality of pico cells uses a second RAT; and
if the mobile device has both the first RAT and the second RAT simultaneously enabled, then the mobile device directs traffic with strong quality of service requirements onto the nearest macro cell employing the first RAT while directing best-effort traffic onto the nearest pico cell employing the second RAT, such that the mobile device maintains two concurrent connections to two different base stations, wherein the dual connection of the mobile device to two different RATs prolongs the battery life of the mobile device.
8. The method of claim 5 , further comprising:
if the plurality of macro cells uses a first radio access technology (RAT) and the plurality of pico cells uses a second RAT; and
if the mobile device has both the first RAT and the second RAT simultaneously enabled, then
analyzing, by the mobile device, the network based on mobility, traffic pattern, and load balancing; and
selecting, by the mobile device, the nearest macro cell employing the first RAT as the serving base station of the mobile device based on the network analysis.
9. A method to select a serving base station of a mobile device traveling through a wireless neighborhood, the serving base station to be connected to a network, the method comprising:
checking, by a base station entity operating in the wireless neighborhood, the battery level of the mobile device, wherein the serving base station of the mobile device is either a macro cell that supports high-mobility devices or a pico cell that provides low-mobility coverage on the network;
if the battery level does not exceed a predetermined threshold, selecting, by the base station entity, the pico cell as the serving base station of the mobile device, wherein the pico cell is the nearest to the mobile device of a plurality of pico cells in the wireless neighborhood;
if the battery level does exceed the predetermined threshold, determining, by the base station entity, whether the mobile device is mostly receiving downlink transactions from or sending uplink transactions to the serving base station; and
if the mobile device is mostly receiving downlink transactions from the serving base station, selecting, by the base station, the macro cell as the serving base station of the mobile device, wherein the macro cell is the nearest to the mobile device of a plurality of macro cells in the wireless neighborhood.
10. The method of claim 9 , further comprising:
if the mobile device is mostly sending uplink transactions to the serving base station, selecting, by the base station entity, the pico cell as the serving base station of the mobile device in the wireless neighborhood.
11. The method of claim 9 , further comprising:
if the plurality of macro cells uses a first radio access technology (RAT) and the plurality of pico cells uses a second RAT; and
if the mobile device has both the first RAT and the second RAT simultaneously enabled, then the mobile device directs traffic with strong quality of service requirements onto the nearest macro cell employing the first RAT while directing best-effort traffic onto the nearest pico cell employing the second RAT, such that the mobile device maintains two concurrent connections to two different base stations, wherein the dual connection of the mobile device to two different RATs prolongs the battery life of the mobile device.
12. The method of claim 9 , further comprising:
if the plurality of macro cells uses a first radio access technology (RAT) and the plurality of pico cells uses a second RAT; and
if the mobile device has both the first RAT and the second RAT simultaneously enabled, then
analyzing, by the base station entity, the network based on mobility, traffic pattern, and load balancing; and
selecting, by the base station entity, the nearest macro cell employing the first RAT as the serving base station of the mobile device based on the network analysis.
13. The method of claim 9 , wherein the base station entity is the serving base station.
14. The method of claim 9 , wherein the base station entity is the serving base station and a second base station operating in the wireless neighborhood.
15. The method of claim 9 , wherein the base station entity is the serving base station and a plurality of base stations operating in the wireless neighborhood.