Mobile station GPRS implementation for switching between licensed and unlicensed wireless systems
View Patent ↗An unlicensed wireless service is adapted to generate the interface protocols of a licensed wireless service to provide transparent transition of communication sessions between a licensed wireless service and an unlicensed wireless service. In one embodiment, a mobile station includes level 1, level 2, and level 3 protocols for licensed wireless service and an unlicensed wireless service. An indoor base station and indoor network controller provide protocol conversion for the unlicensed wireless service into a standard base station controller interface of the licensed wireless service.
1. A mobile station for accessing both an unlicensed wireless communication system and a licensed wireless communication system, wherein the licensed system is a General Packet Radio Service (GPRS), the mobile station comprising:
a) a GPRS mode for accessing the GPRS;
b) an unlicensed wireless mode for accessing the unlicensed wireless communication system;
c) a GPRS mobility management (GMM) protocol layer for managing mobile station mobility;
d) a logical link control (LLC) protocol layer;
e) an access mode switch for switching between the unlicensed wireless mode and the GPRS mode;
f) an unlicensed network radio link control (RLC) entity; and
g) a GPRS radio link control (GPRS-RLC) entity;
i. wherein the GPRS-RLC entity and the unlicensed network RLC entity coordinate with each other; and
ii. wherein the unlicensed network RLC entity and the GPRS-RLC entity each communicate with the GMM protocol layer through a GPRS mobility management radio resource management service access point (GMMRR-SAP) interface; and
iii. wherein the unlicensed network RLC entity and the GPRS-RLC entity each communicate with the LLC protocol layer through a GPRS radio resource management service access point (GRR-SAP) interface.
2. The mobile station of claim 1 , wherein the access mode switch switches signaling functions between the unlicensed wireless mode and the GPRS mode.
3. The mobile station of claim 1 , wherein the access mode switch switches data communications between the unlicensed wireless mode and the GPRS mode.
4. The mobile station of claim 1 , wherein the GRR-SAP interface behaves identically when communicating with the unlicensed network RLC entity and when communicating with the GPRS-RLC entity.
5. The mobile station of claim 1 , wherein the GMMRR-SAP interface behaves identically when communicating with the unlicensed network RLC entity and when communicating with the GPRS-RLC entity.
6. The mobile station of claim 4 , wherein the GMMRR-SAP interface behaves identically when communicating with the unlicensed network RLC entity and when communicating with the GPRS-RLC entity.
7. The mobile station of claim 6 , wherein:
a) the unlicensed network RLC entity provides coordination with the GPRS-RLC entity through an unlicensed network-GPRS service access point interface; and
b) the GPRS-RLC entity provides coordination with the unlicensed network RLC entity through a GPRS-unlicensed network service access point interface.
8. The mobile station of claim 6 , wherein the mobile station accesses the unlicensed wireless communication system using a Bluetooth wireless standard.
9. The mobile station of claim 6 , wherein the mobile station further comprises a plurality of protocol layers.
10. The mobile station of claim 9 , wherein the mobile station communicates with the unlicensed wireless communication system using the unlicensed network RLC entity.
11. The mobile station of claim 9 , wherein the unlicensed wireless communication system is transparent to the LLC protocol layer.
12. The mobile station of claim 9 , wherein the mobile station further comprises an internet protocol (IP) layer.
13. The mobile station of claim 12 , wherein the mobile station communicates with a gateway GPRS support node (GGSN) using the IP protocol layer.
14. The mobile station of claim 9 , wherein the mobile station communicates with a serving GPRS support node (SGSN) using the LLC protocol layer.
15. The mobile station of claim 14 , wherein the LLC protocol layer connects to the SGSN through a Gb-standard interface.
16. The mobile station of claim 9 , wherein the mobile station communicates with a serving GPRS support node (SGSN) using a subnetwork dependent convergence protocol (SNDCP) layer.
17. The mobile station of claim 16 , wherein the SNDCP layer connects to the SGSN through a Gb-standard interface.
18. The mobile station of claim 9 , wherein the mobile station further comprises a group of protocol layers above the LLC protocol layer.
19. The mobile station of claim 18 , wherein the unlicensed wireless communication system is transparent to the group of protocol layers above the LLC protocol layer.