1. A flow control device comprising:
an annular housing having a peripheral wall and side walls which provide an enclosure for a body of liquid swellable material, the peripheral wall of the housing having one or more orifices providing inlet ports for liquid flow into the housing one of said side walls of the housing to be located in a downstream position of the device having an outlet opening for liquid flow out of the housing and the other side to be located in an upstream position being closed; and
a body of a liquid swellable material located in the housing having an upstream side, an outer periphery and a downstream side in relation to the direction of liquid flow through the device, the body of liquid swellable material within the housing having an encircling sealing layer around its outer periphery to engage the inner periphery of the housing when the body of material is in a swollen condition from contact with liquid to close off flow of liquid through the housing and to allow liquid flow through the housing when the body of swellable material is in its contracted condition.
2. A flow control device as claimed in claim 1, wherein the housing is mounted concentrically in a tube or cylindrical body through which liquid flows with the closed side wall of the housing upstream of the open side wall and the periphery of the housing spaced inwardly of the tube or cylindrical body.
3. A flow control device as claimed in claim 2, wherein the tube or cylindrical body has a transverse barrier extending across the body and the housing is mounted in the barrier.
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 system, comprising;
circuitry, configured to
obtain state information of one or more secondary systems managed by the system in a management region;
determine first radio resources of a primary system available for the secondary systems based on the state information and allow the secondary systems to use the first radio resources;
identify a change of the state information;
determine second radio resources of the primary system available for the secondary systems based on the change; and
request the secondary systems to use the second radio resources if the second radio resources is smaller than the first radio resources.
2. The system according to claim 1, wherein the circuitry is further configured to not to request the secondary systems to use the second radio resources if the second radio resources is larger than the first radio resources.
3. The system according to claim 2, wherein the circuitry is further configured to indicate the secondary systems to use the first radio resources if the second radio resources is larger than the first radio resources.
4. The system according to claim 1, wherein the state information comprises at least one of: location information of the secondary systems, information of the number of secondary systems, and system parameter information of the secondary systems.
5. The system according to claim 1, wherein the state information of the secondary systems comprises operating regions of the secondary systems, or at least one of a system type, a moving state and an air interface type of the secondary systems, and the circuitry is configured to determine the management region based on the state information.
6. The system according to claim 1, wherein the circuitry is configured to determine radio resources available to the secondary systems for different positions in the management region, and determine the first radio resources based on the radio resources available to the secondary systems for different positions in the management region.
7. The system according to claim 1, wherein the system comprises a database.
8. The system according to claim 1, wherein the system comprises the primary system.
9. A method for a system, comprising:
obtaining state information of one or more secondary systems managed by the system in a management region;
determining first radio resources of a primary system available for the secondary systems based on the state information and allow the secondary systems to use the first radio resources;
identifying a change of the state information;
determining second radio resources of the primary system available for the secondary systems based on the change; and
requesting the secondary systems to use the second radio resources if the second radio resources is smaller than the first radio resources.
10. A system, comprising:
circuitry, configured to
provide state information of the system to a device managing the system;
receive first radio resources of a primary system available for the system from the device;
receive second radio resources of the primary system available for the system from the device after receiving the first radio resources;
use the second radio resources if second radio resources is smaller than the first radio resources.
11. The system according to claim 10, wherein the circuitry is further configured to not to use the second radio resources if the second radio resources is larger than the first radio resources.
12. The system according to claim 11, wherein the circuitry is further configured to use the first radio resources if the second radio resources is larger than the first radio resources.
13. The system according to claim 10, wherein the state information comprises at least one of: location information of the system, information of the onoff state of the system, and system parameter information of the system.
14. The system according to claim 1, wherein the state information comprises an operating region of the system or at least one of a system type, a moving state and an air interface type of the system.
15. A method for a system, comprising:
providing state information of the system to a device managing the system;
receiving first radio resources of a primary system available for the system from the device;
receiving second radio resources of the primary system available for the system from the device after receiving the first radio resources;
using the second radio resources if second radio resources is smaller than the first radio resources.
16. A non-transient computer readable medium in a system comprising computer-executable instructions for performing stops of:
obtaining state information of one or more secondary systems managed by the system in a management region;
determining first radio resources of a primary system available for the secondary systems based on the state information and allow the secondary systems to use the first radio resources;
identifying a change of the state information;
determining second radio resources of the primary system available for the secondary systems based on the change; and
requesting the secondary systems to use the second radio resources if the second radio resources is smaller than the first radio resources.
17. A non-transient computer readable medium in a system comprising computer-executable instructions for performing steps of:
providing state information of the system to a device managing the system;
receiving first radio resources of a primary system available for the system from the device;
receiving second radio resources of the primary system available for the system from the device after receiving the first radio resources;
using the second radio resources if second radio resources is smaller than the first radio resources.