Wireless communication methods and components for facilitating multiple network type compatibility
This invention relates to wireless local area networks (WLANs), and the interoperability of networks of different types or conforming to different standards, and to methods and apparatus to allow a multimode wireless transmit/receive unit (WTRU), which is able to operate in more than one type of network, to handover from one network type to another without adversely affecting service, utilizing a mechanism and information flows implemented in a new protocol stack.
1. A wireless transmit/receive unit (WTRU) comprising:
a first physical (PHY) layer component configured to communicate with a first network of a first network type, wherein the first network type is an IEEE 802 wireless network type;
a second PHY layer component configured to communicate with a second network of a second network type, wherein the second network type is not the first network type;
a first medium access control (MAC) layer component configured to communicate with the first PHY layer component;
a second MAC layer component configured to communicate with the second PHY layer component; and
an interworking component configured to communicate with the first PHY layer component, the second PHY layer component, the first MAC layer component, the second MAC layer component, and a higher layer component, and
wherein the interworking component is configured to provide
a first service for managing and controlling link behavior, wherein providing the first service includes configuring a trigger at the first MAC layer component, the first PHY layer component, the second MAC layer component, or the second PHY layer component,
a second service for processing link events received from the first PHY layer component, the second MAC layer component, the second PHY layer component, or the higher layer component, and
a third service for processing network information received from the first PHY layer component, the second MAC layer component, the second PHY layer component, or the higher layer component.
2. The WTRU of claim 1 , wherein the providing the second service includes:
receiving handover triggers from, the first MAC layer component, the second MAC layer component, or the higher layer component; and
transmitting handover triggers to the first MAC layer component, the second MAC layer component, or the higher layer component.
3. The WTRU of claim 2 , wherein the handover trigger is a link down trigger.
4. The WTRU of claim 2 , wherein the handover trigger is a link up trigger.
5. The WTRU of claim 1 , wherein the providing the third service includes maintaining a list of neighbor networks, the list including network capability information for at least one of the neighbor networks.
6. The WTRU of claim 5 , wherein the network capability information includes quality of service (QoS) information.
7. The WTRU of claim 5 , wherein the network capability information includes link condition information.
8. The WTRU of claim 5 , wherein the providing the third service includes exchanging network capability information with a control function of the first network.
9. The WTRU of claim 5 , wherein the providing the third service includes exchanging network capability information with a control function of the second network.
10. The WTRU of claim 1 , wherein the providing the second service includes determining whether to handover the WTRU between the first and second networks.
11. The WTRU of claim 10 , wherein the determining whether to handover is based on a quality of service (QoS) metric.
12. The WTRU of claim 10 , wherein the determining whether to handover is based on a cost of service metric.
13. The WTRU of claim 10 , wherein the determining whether to handover is based on congestion information.
14. The WTRU of claim 1 , further comprising a link layer component configured to communicate with the first MAC layer component or the second MAC layer component, and configured to communicate with the interworking component.
15. The WTRU of claim 1 , wherein the second network type is a cellular network type, a 3GPP network type, a 3GPP2 network type, a GPRS network type, a wired network type, or an IEEE 802 network type.
16. The WTRU of claim 1 , further comprising a radio resource control (RRC) component configured to communicate with the second MAC layer component, and wherein the interworking component is configured to communicate with the radio resource control (RRC) component.
17. A method for use in a wireless transmit/receive unit (WTRU) that includes a first communication stack, an interworking component and a second communication stack, the method comprising:
generating a handover trigger in the first communication stack, the first communication stack configured to communicate with a first network that is an IEEE 802 wireless network;
communicating the handover trigger from the first communication stack to the interworking component;
communicating the handover trigger from the interworking component to the second communication stack, the second communication stack configured to communicate with a second network; and
communicating the handover trigger from the second communication stack to a control function via the second network.
18. The method of claim 17 , wherein the interworking component is configured as a layer in the first communication stack and the second communication stack.
19. The method of claim 17 , further comprising:
receiving from the control function of the second network, in response to the handover trigger, a command to perform a handover.
20. The method of claim 17 , wherein the first communication stack includes a physical (PHY) layer component and the generating is performed by the PHY layer component.
21. The method of claim 17 , wherein the first communication stack includes a Medium Access Control (MAC) layer component and the generating is performed by the MAC layer component.
22. The method of claim 17 , wherein the second network is a cellular network, a GSM network, a UMTS network, a 3GPP network, a 3GPP2 network, or a GPRS network.
23. The method of claim 17 , wherein the second network is a wired network.
24. The method of claim 17 , wherein the second network is an IEEE 802 wireless network.
25. A method for use in a wireless transmit/receive unit (WTRU) that includes a first communication stack, an interworking component and a second communication stack, the method comprising:
generating a handover trigger in the first communication stack, the first communication stack configured to communicate with a first network;
communicating the handover trigger from the first communication stack to the interworking component;
communicating the handover trigger from the interworking component to the second communication stack, the second communication stack configured to communicate with a second network that is an IEEE 802 wireless network; and
communicating the handover trigger from the second communication stack to a control function on the second network.
26. The method of claim 25 , wherein the interworking component is configured as a layer in the first communication stack and the second communication stack.
27. The method of claim 25 , further comprising:
receiving from the control function of the second network, in response to the handover trigger, a command to perform a handover.
28. The method of claim 25 , wherein the generating the handover trigger is performed by a physical (PHY) layer component in the first communication stack.
29. The method of claim 25 , wherein the generating a handover trigger is performed by a Medium Access Control (MAC) layer component in the first communication stack.
30. The method of claim 25 , wherein the first network is a cellular network, a GSM network, a UMTS network, a 3GPP network, a 3GPP2 network, or a GPRS network.
31. The method of claim 25 , wherein the first network is a wired network.
32. The method of claim 25 , wherein the first network is an IEEE 802 network.