1. A method for a subscription service in an IP multimedia subsystem network, comprising:
establishing IP channels between a Session Border Controller (SBC) and an IP Multimedia Subsystem (IMS) terminal as well as between the SBC and a Resource List Server (RLS) after the SBC receives a status subscribe request message from the IMS terminal; and
sending, by the RLS, subscribed status information and an acknowledgment message to the IMS terminal through the IP channels after the RLS finds the subscribed status information for the IMS terminal.
2. The method according to claim 1, wherein the status subscribe request message sent by the IMS terminal contains information about whether the IMS terminal has a capability of receiving status subscription information through the IP channels.
3. The method according to claim 2, wherein the establishing the IP channels comprises:
when determining that the IMS terminal has the capability of receiving status subscription information through the IP channels according to the status subscribe request message received from the IMS terminal, determining, by the SBC, an IP channel for the IMS terminal in the SBC, and sending by the SBC the status subscribe request message to the RLS through an IP channel interface facing the RLS;
after receiving the acknowledgment message of the subscribe request message returned by the RLS, obtaining, by the SBC, an IP address of the RLS in the acknowledgment message, generating by the SBC an IP forwarding strategy facing the RLS, establishing by the SBC the IP channel between the SBC and the RLS, and sending by the SBC the acknowledgment message of the subscribe request message to the IMS terminal; and
directly sending, by the IMS terminal, an empty data packet to an IP channel interface of the SBC facing the IMS terminal after the IMS terminal receives the acknowledgment message from the SBC, and setting, by the SBC, a forwarding strategy facing the IMS terminal after the SBC receives the empty data packet and establishing by the SBC the IP channel between the SBC and the IMS terminal.
4. The method according to claim 3, wherein the sending the status subscribe request message to the RLS through the IP channel interface facing the RLS comprises:
parsing the status subscribe request message received from the IMS terminal, removing the information about whether the IMS terminal has the capability of receiving status subscription information through IP channels, replacing address information of the IMS terminal in the status subscribe request message with an address of the IP channel interface facing the RLS, and then sending the address of the IP channel interface facing the RLS to the RLS by a Proxy Call Session Control Function (P-CSCF) and a Service Call Session Control Function (S-CSCF).
5. The method according to claim 3, wherein the setting the IP forwarding strategy facing the RLS comprises:
obtaining, by the SBC, IP address information of the RLS contained in the acknowledgment message returned by the RLS, and using, by the SBC, the IP address of the RLS as a destination address of data packets sent to the RLS from the IMS terminal; and
the setting the IP forwarding strategy facing the IMS terminal comprises:
obtaining, by the SBC, IP address information of the IMS terminal according to the empty data packet, and using, by the SBC, the IP address of the IMS terminal as a destination address of data packets sent to the IMS terminal from the RLS.
6. The method according to claim 3, wherein, after the IP channels are established between the SBC and the IMS terminal as well as between the SBC and the RLS, information is not forwarded through a P-CSCF and an S-CSCF in the IP channels facing the RLS anymore.
7. A system for a subscription service in an IP multimedia subsystem (IMS) network, comprising a receiving unit, an establishing unit, a searching unit and a sending unit; wherein
the receiving unit is located in an SBC and configured to receive a status subscribe request message from an IMS terminal;
the establishing unit is configured to establish IP channels between the SBC and the IMS terminal as well as between the SBC and an RLS after the receiving unit receives the status subscribe request message from the IMS terminal;
the searching unit is located in the RLS and configured to find subscribed status information after receiving a subscribe request; and
the sending unit is located in the RLS and configured to send the status information found by the searching unit and an acknowledgment message of the subscribe message to the IMS terminal through the IP channels established by the establishing unit.
8. The system according to claim 7, wherein the status subscribe request message sent by the IMS terminal contains information about whether the IMS terminal has a capability of receiving status subscription information through the IP channels.
9. The system according to claim 8, wherein the establishing unit further comprises a first determining subunit, a second determining subunit, a first sending subunit, a first receiving subunit, an obtaining subunit, a first generating subunit, a first establishing subunit, a second sending subunit, a second receiving subunit, a third sending subunit, a third receiving subunit, a second generating subunit and a second establishing subunit; wherein
the first determining subunit is located in the SBC and configured to determine whether the IMS terminal has the capability of receiving status subscription information through the IP channels according to the status subscribe request message received by the receiving unit from the IMS terminal, and to trigger the second determining subunit when the IMS terminal has the capability of receiving status subscription information through the IP channels;
the second determining subunit is located in the SBC and configured to determine an IP channel for the IMS terminal in the SBC;
the first sending subunit is located in the SBC and configured to send the status subscribe request message to the RLS through an IP channel interface facing the RLS;
the first receiving subunit is located in the SBC and configured to receive the acknowledgment message of the subscribe request message returned by the RLS;
the obtaining subunit is located in the SBC and configured to obtain an IP address of the RLS in the acknowledgment message after the first receiving subunit receives the acknowledgment message of the subscribe request message;
the first generating subunit is located in the SBC and configured to generate an IP forwarding strategy facing the RLS;
the first establishing subunit is located in the SBC and configured to establish the IP channel between the SBC and the RLS;
the second sending subunit is located in the SBC and configured to send the acknowledgment message of the subscribe request message to the IMS terminal;
the second receiving subunit is located in the IMS terminal and configured to receive the acknowledgment message of the subscribe message from the SBC;
the third sending subunit is located in the IMS terminal and configured to send an empty data packet to the SBC through an IP channel interface of the SBC facing the IMS terminal;
the third receiving subunit is located in the SBC and configured to receive the empty data packet;
the second generating subunit is configured to generate a forwarding strategy facing the IMS terminal; and
the second establishing subunit is configured to establish the IP channel between the SBC and the IMS terminal.
10. The system according to claim 9, wherein the first sending subunit further comprises a parsing sub-module, a removing sub-module, a replacing sub-module and a sending sub-module; wherein
the parsing sub-module is configured to parse the status subscribe request message received from the IMS terminal;
the removing sub-module is configured to remove the information about whether the IMS terminal has the capability of receiving status subscription information through the IP channels;
the replacing sub-module is configured to replace address information of the IMS terminal in the status subscribe request message with an address of the IP channel interface facing the RLS; and
the sending sub-module is configured to send the status subscribe request message to the RLS through a P-CSCF and an S-CSCF.
11. The system according to claim 9, wherein the first generating subunit further obtains, through the obtaining unit, IP address information of the RLS contained in the acknowledgment message returned by the RLS, and uses the IP address of the RLS as a destination address of data packets sent to the RLS from the IMS terminal; and
the second generating subunit further obtains IP address information of the IMS terminal according to the empty data packet, and uses the IP address of the IMS terminal as a destination address of data packets sent to the IMS terminal from the RLS.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A filter device for fluids including a filter case (1), comprising at least one filter inlet (2) and one filter outlet (3) and an intermediately arranged filter (4), characterized in that said filter (4; 36; 40) has at least two parts and has a duct (16), embedded in said filter (4), said duct (16) provided with a pressure-controlled regulating valve (9), and said duct (16) by-passes at least one part of said filter (4):
2. The filter device according to claim 1, characterized in that said filter (36; 40) comprising two or more ring-shaped filter elements (37, 38, 39 . . . 41), concentrically arranged one inside the other, or comprising two or several adjacently arranged, cascade-shaped filter elements (43, 44, 45 . . . 47), whereby said duct (16) is embedded between each two adjacent filter elements (37, 38; 38, 39; 39, 40); . . . andor 43, 44; 44, 45; 45, 46; . . . ).
3. The filter device according to claim 1, characterized in that said filter (4) is arranged concentrically around a central tube (18) of the filter device and said filter (4) comprises at least one outer and at least one inner filter element (7, 8).
4. The filter device according to claim 3, characterized in that said duct (16) is spirally shaped around said inner filter element (8).
5. The filter device according to claim 1, characterized in that said duct (16) has a diameter equal tolarger than 0.1 mm, specifically 0.1 to 10 mm and has openings (17) distributed over its peripheral area.
6. The filter device according to claim 1, characterized in that said duct (16) consists of the same material as said filter (4).
7. The filter device according to claim 1, characterized in that said duct (16) is made of a metal or plastic tube.
8. The filter device according to claim 1, characterized in that said duct (16) comprises a tube made of pulp, cellulose or fiber material.
9. The filter device according to claim 2, characterized in that duct (16) is formed within the filter (4; 36; 42) between two filter elements (7, 8; 37, 38; . . . 40, 41 or 43, 44; . . . 46, 47).
10. The filter device according to claim 1, characterized in that one or more pressure-controlled regulating valves (9) are arranged in said duct (16).
11. The filter device according to claim 10, characterized in that a sieve (11) is positioned upstream from each of said regulating valves (9) in the duct (16).
12. The filter device according to claim 10, characterized in that each of said regulating valves (9) has a ball (33) subjected to the load of a compression spring (32).
13. The filter device according to claim 3, characterized in that a by-pass valve (5) is positioned up-stream from said central tube (18), said end of the central tube (18) facing away from said by-pass valve is aligned with said filter outlet (3) and that a by-pass path (6) from the filter inlet (2) via the by-pass valve (5) to the central tube (18) completely by-passes the filter (4).
14. The filter device according to claim 1, characterized in that said filter case (I) includes a case lid (26) which is connected via a flanged joint (27), secured by screws (28).
15. The filter device according to claim 1, characterized in that said filter (4) is stably mounted by means of washers (31) and a base plate (20).
16. The filter device according to claim 15, characterized in that said base plate (20) comprises a centrally positioned cylinder part (23) which has an external thread (24) that is screwed onto an internal thread (25) of said tube (18) and that said by-pass valve (5) is arranged in said cylinder part (23).
17. The filter device according to claim 15, characterized in that said base plate (20) comprises an inlet opening (21) to a ring-shaped channel (14) between the filter elements (7, 8) and that said duct (16) runs in the channel (14).
18. The filter device according to claim 3, characterized in that said central tube (18) is outfitted with a number of openings (19) evenly distributed over its peripheral area.
19. The filter device according to claim 1, characterized in that two filter inlets (2) are provided symmetrical to the axis of said filter case (1), that each filter inlet (2) comprises an external thread (12) and that said filter outlet (3), centered in respect to said filter case (1), comprises an external thread (13).
20. A method for filtering fluids through a filter, comprising:
introducing a fluid, filtering said fluid until the pressure across the filter reaches a first pre-set limit, by-passing a part of said filter while continuing filtering the fluid through the remaining part of said filter, and by-passing said entire filter when the pressure increase across said filter reaches a second pre-set limit.
21. The method of claim 20, wherein said first and second pre-set limits may be the same or different.
22. The method of claim 20, wherein said step of by-passing a part of said filter includes a duct and a by-pass valve position within said duct, said by-pass valve set at said first limit to allow said fluid to by-pass a part of said filter.
23. The method of claim 22, wherein said step of by-passing said entire filter includes a second by-pass valve, said second by-pass valve set at said second limit to allow the fluid to by-pass the filter entirely.
24. The method of claim 20, wherein said fluid is selected from the class of hydraulic oil, motor oil, transmission oil, transformer oil, petroleum and synthetic oils, or their mixtures, mineral oils, partially and completely synthetic oils, partially or completely biological oils, and mixtures of various oils.
25. (canceled)
26. (canceled)
27. (canceled)
28. (canceled)
29. (canceled)
30. (canceled)