CSFB with RIM Without Network Support

1 . A method for providing Circuit Switch Fall Back (CSFB) with Radio Access Network (RAN) Information Management (RIM) without network support, comprising:

receiving, by a coordinating server, direct information transfer System Information (SI) messages with RIM Packet Data Unit (PDU) from an eNodeB;

sending, by the coordinating server, a RAN-information-request message to a relevant cell, using the routing information in the RIM PDU;

collecting and replaying by the cell the SI needed for CFSB to the coordinating server;

storing, by the coordinating server, the latest SI information per cell; and

replaying, by the coordinating server, the eNodeB with the stored SI information using a MME direct information transfer S1 message.

2 . The method of claim 1 wherein the cell is a 2G cell.

3 . The method of claim 1 wherein upon boot, receiving by the coordinating server from the eNodeB, direct information transfer S1 messages with RIM PDU, a single message for each 2G neighbor in the eNodeB Neighbor Relation Table (NRT).

4 . The method of claim 1 further comprising:

sending, by the coordinating server, RAN-information-request message to the relevant 2G cell, using the routing information in the RIM PDU;

replaying, by the 2G cell, the SI (System Information) needed for CFSB to the coordinating server; and

storing, by the coordinating server, the latest SI information per 2G cell.

5 . The method of claim 1 further comprising determining, by the coordinating server, when SI configuration changes and marking the cell status as SI fetch needed.

6 . The method of claim 5 further comprising determining when the cell status is SI fetch not needed and replaying with the stored SI information using s direct information transfer SI message.

7 . The method of claim 5 further comprising determining when the cell status is SI fetch needed and sending the RAN-information-request message to the relevant 2G cell.

8 . The method of claim 1 further comprising receiving, at the coordinating server, SI needed for CFSB.

9 . The method of claim 8 further comprising storing, by the coordinating server, the latest SI information per 2G cell.

10 . The method of claim 9 further comprising replaying, by the coordinating server to the eNodeB, the stored SI information using an MME direct information transfer SI message.

11 . A system for providing Circuit Switch Fall Back (CSFB) with Radio Access Network (RAN) Information Management (RIM) without network support, comprising:

a coordinating server network device;

wherein the coordinating server receives direct information transfer System Information (SI) messages with RIM Packet Data Unit (PDU) from an eNodeB;

wherein the coordinating server sends a RAN-information-request message to a relevant cell, using the routing information in the RIM PDU;

wherein the cell collects and replays the SI needed for CFSB to the coordinating server;

wherein the coordinating server saves the latest SI information per cell; and

wherein the coordinating server replays the eNodeB with the stored SI information using a MME direct information transfer S1 message.

12 . The system of claim 11 wherein the cell is a 2G cell.

13 . The system of claim 1 wherein upon boot the coordinating server receives from the eNodeB a direct information transfer S1 messages with RIM PDU, a single message for each 2G neighbor in the eNodeB Neighbor Relation Table (NRT).

14 . The system of claim 1 further comprising:

wherein the coordinating server sends a RAN-information-request message to the relevant 2G cell, using the routing information in the RIM PDU;

receives from the 2G cell the SI (System Information) needed for CFSB; and

stores the latest SI information per 2G cell.

15 . The system of claim 11 wherein the coordinating server determines when SI configuration changes and required and marks the cell status as SI fetch needed.

16 . The system of claim 15 wherein the coordinating server determines when the cell status is SI fetch not needed and replays the stored SI information using s direct information transfer SI message.

17 . The system of claim 15 wherein the coordinating server determines when the cell status is SI fetch needed and sends the RAN-information-request message to the relevant 2G cell.

18 . The system of claim 11 further comprising receiving, at the coordinating server, SI needed for CFSB.

19 . The system of claim 18 wherein the coordinating server stores the latest SI information per 2G cell.

20 . The system of claim 19 wherein the coordinating server replays to the eNodeB the stored SI information using an MME direct information transfer SI message.