1. A method for configuring a central subcarrier, comprising:
mapping a first downlink control channel onto a part (f1) of a downlink bandwidth (fW) of a cell, and configuring a first virtual central subcarrier in f1; and
mapping a downlink data channel onto fW of the cell, and configuring a central subcarrier on fW, wherein
f1 is different or partly different from a bandwidth f2 mapped to a second downlink control channel of the cell or a neighboring cell, an overlap between f1 and f2 is at least one subcarrier, or at least one idle subcarrier exists between f1 and f2, or at least one non-idle subcarrier and at least one idle subcarrier exist between f1 and f2; and
the first virtual central subcarrier is located on a grid position of a central frequency, a distance between the first virtual central subcarrier and a second virtual central subcarrier configured in f2 is an integer multiple of a frequency domain width of the subcarrier, and borders of physical resource blocks (PRBs) are aligned between the cell and the neighboring cell.
2. The method according to claim 1, wherein:
the first virtual central subcarrier is located on a grid position of a central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier configured in f2 is an integer multiple of the frequency domain width of the subcarrier, which comprises:
the second virtual central subcarrier is located on the grid position of the central frequency, the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of a grid frequency domain width of the central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of the frequency domain width of the subcarrier.
3. The method according to claim 1, wherein:
in the case of multi-carrier transmission, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the cell; and
in the case of orthogonal transmission of the downlink control channel, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the neighboring cell.
4. The method according to claim 1, wherein the configuring the central subcarrier on fW comprises at least one of the following steps:
configuring the central subcarrier on an overlapping subcarrier between f1 and f2, and configuring the central subcarrier on an idle subcarrier between f1 and f2.
5. The method according to claim 4, further comprising:
sending downlink control channel signals andor downlink reference signals on subcarriers other than the overlapping subcarrier between f1 and f2.
6. The method according to claim 5, wherein the sending the downlink control channel signals andor downlink reference signals on the subcarriers other than the overlapping subcarrier between f1 and f2 comprises:
sending signals of PCFICH, andor PHICH, andor CRS, andor CSI-RS on the subcarriers other than the overlapping subcarrier between f1 and f2.
7. The method according to claim 4, wherein
physical resource blocks (PRBs) adjacent to the overlapping subcarrier between f1 and f2 comprise subcarriers other than the overlapping subcarrier between f1 and f2.
8. The method according to claim 1, further comprising:
when a coverage scope of the cell is less than a first threshold, increasing bandwidth occupied in fW and decreasing protection bandwidth occupied in fW.
9. The method according to claim 1, further comprising:
setting an idle subcarrier or a non-idle subcarrier on the second virtual central subcarrier of the cell, wherein the idle subcarrier or non-idle subcarrier belongs to a neighboring PRB.
10. A device for configuring a central subcarrier, comprising:
a first mapping and configuring unit, configured to: map a first downlink control channel onto a part (f1) of a downlink bandwidth (fW) of a cell, and configure a first virtual central subcarrier in f1, wherein f1 is different or partly different from a bandwidth (f2) mapped to a second downlink control channel, an overlap between f1 and f2 is at least one subcarrier, or at least one idle subcarrier exists between f1 and f2, or at least one non-idle subcarrier and at least one idle subcarrier exist between f1 and f2; the first virtual central subcarrier is located on a grid position of a central frequency, a distance between the first virtual central subcarrier and a second virtual central subcarrier configured in f2 is an integer multiple of a frequency domain width of the subcarrier, and physical resource blocks (PRBs) are aligned between the cell and a neighboring cell; and
a second mapping and configuring unit, configured to map a downlink data channel onto fW of the cell, and configure a central subcarrier on fW.
11. The device according to claim 10, wherein:
the first virtual central subcarrier is located on a grid position of a central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier configured in f2 is an integer multiple of the frequency domain width of the subcarrier, which comprises:
the second virtual central subcarrier is located on the grid position of the central frequency, the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of a grid frequency domain width of the central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of the frequency domain width of the subcarrier.
12. The device according to claim 10, wherein:
in the case of multi-carrier transmission, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the cell; and
in the case of orthogonal transmission of the downlink control channel, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the neighboring cell.
13. The device according to claim 10, wherein the second mapping and configuring unit is specifically configured to:
map a downlink data channel onto fW of the cell;
configure at least one of the central subcarrier on an overlapping subcarrier between f1 and f2 and a central subcarrier on the idle subcarrier between f1 and f2.
14. The device according to claim 13, further comprising:
a sending unit, configured to send downlink control channel signals andor downlink reference signals on subcarriers other than the overlapping subcarrier between f1 and f2.
15. The device according to claim 14, wherein the sending unit is specifically configured to:
send signals of PCFICH, andor PHICH, andor CRS, andor CSI-RS on subcarriers other than the overlapping subcarrier between f1 and f2.
16. The device according to claim 13, wherein physical resource blocks (PRBs) adjacent to the overlapping subcarrier between f1 and f2 comprise subcarriers other than the overlapping subcarrier between f1 and f2.
17. The device according to claim 10, further comprising:
a bandwidth adjusting unit, configured to: increase the bandwidth occupied in fW and decrease the protection bandwidth occupied in fW when a coverage scope of the cell is less than a first threshold.
18. The device according to claim 10, further comprising:
a configuring unit, configured to set an idle subcarrier or a non-idle subcarrier on the second virtual central subcarrier of the cell, wherein the idle subcarrier or non-idle subcarrier belongs to a neighboring PRB.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A fluid injection nozzle comprising:
a valve body having an inner circumference forming a fluid passage and converging toward a fluid downstream side, and having a valve seat on said inner circumference;
an injection port plate arranged on the fluid passage downstream side of said valve seat and having an injection port for injecting a fluid to flow out of said fluid passage; and
a valve member for shutting said fluid passage, when seated on said valve seat, and for opening said fluid passage when unseated from said valve seat, wherein
an injection port axis joining a center of an fluid inlet and a center of a fluid outlet of said injection port is inclined with respect to a center axis of said injection port plate,
two lines of intersection between a virtual plane containing said injection port axis and normal to said injection port plate and an injection port inner circumference of said injection port plate forming said injection port are inclined in a same direction as that of said injection port axis with respect to said center axis, and
when a first intersection line formed on an obtuse angle side by said injection port axis and a fluid inlet side end face of said injection port plate has a first angle of inclination 1 with respect to said center axis and when a second intersection line formed on an acute angle side by said injection port axis and the fluid inlet side end face has a second angle inclination 2, 1<2.
2. A fluid injection nozzle according to claim 1, wherein,
said injection port is formed in plurality, and
said injection port axis of each injection port is inclined in a direction toward a fluid outlet side apart from said center axis.
3. A fluid injection nozzle according to claim 1, wherein 1 is 15 degrees or more.
4. A fluid injection nozzle according to claim 1, wherein 321 and 315 degrees.
5. A fluid injection nozzle according to claim 1, wherein
when the distance from an intersection between said second intersection line and said fluid inlet side end face to said first intersection line is designated by d and when said injection port plate has a thickness t, following relation is satisfied:
0.5td1.2
6. A fluid injection nozzle according to claim 1, wherein
at a plane where an intersection line between a virtual plane perpendicular to said injection port axis and said injection port inner circumference is a circle, when a minor axis diameter of said circle is a and a major axis diameter is b, following relation is satisfied:
0.5ab1
7. A fluid injection nozzle according to claim 1, wherein
said injection port is formed in plurality; and in a group of injection ports lying around said center axis and having their fluid inlets on a common circumference, when said circumference has a diameter DH, when said valve member to be seated on said valve seat has a seat diameter Ds, when a normal distance from an annular seat portion of said valve seat, on which said valve member is seated, to said fluid inlet side end face is designated by H, and when a distance between a leading end face of said valve member confronting said fluid inlet side end face and said fluid inlet side end face at the lifting time of said valve member is designated by h, following relations are simultaneously satisfied:
1.5<DsDH 6, and h<1.5d; and H<4d
8. A fluid injection nozzle according to claim 1, wherein
said injection port is formed in plurality,
a fluid chamber formed just above a fluid inlet side of said injection port is diametrically larger than a fluid downstream open edge formed by said inner circumference, and
said injection port is opened at its fluid inlet in the inner circumference and the outer circumference of a virtual envelope on which the virtual plane extended from said inner circumference toward the fluid downstream side intersects said injection port plate.
9. A fluid injection nozzle according to claim 7, wherein
of a group of injection ports lying around said center axis and having their fluid inlets on a common circumference, when the circumference of the injection port group arranged on the inner circumference side of said virtual envelope has a diameter DH1 and when the circumference of the injection port group arranged on the outer circumference side of said virtual envelope has a diameter DH2, following relations are simultaneously satisfied:
1.5<DsDH1<6, and 0.5<DsDH2<2
10. A fuel injection valve comprising:
a cylindrical valve body having an opening at its leading end and a valve seat on the upstream side of said opening;
a valve member housed slidably in said valve body and having a seat portion on the outer circumference of its one end portion for abutting against said valve seat;
an injection port plate arranged on the leading end face of said valve body for closing the opening of said valve body and having an injection port for injecting a fuel; and
a fuel passage formed between one end portion of said valve member and a passage wall face of said injection port plate so that the fuel having flown in from between said valve seat and said seat portion may flow toward a fuel inlet of said injection port along the passage wall of said injection port plate, wherein
said injection port is so formed through said injection port plate from its fuel inlet to its fuel outlet that it is inclined at a predetermined angle backward to the upstream side with respect to a fuel flow direction of said fuel passage; and
on a port wall face from the fuel inlet to the fuel outlet of said injection port, there are formed two curvature circle portions which have their centers of curvature on a center axis of said injection port and which are directed backward to the upstream side with respect to the flow direction of said fuel passage.
11. A fuel injection valve according to claim 10, wherein
said two curvature circle portions include:
a first curvature circle portion formed on the center axis side of said fuel injection valve and having a predetermined radius of curvature having said center of curvature on the center point of a circle of curvature; and
a second curvature circle portion formed on the side opposed to the center axis side of said fuel injection valve and having a radius of curvature having said center of curvature on the center point of said circle of curvature and substantially identical to that of said first curvature circle portion.
12. A fuel injection valve according to claim 10, wherein said injection port is arranged in plurality on an imaginary line of a single circle on the center axis of said injection port plate.
13. A fuel injection valve according to claim 1, wherein said injection port is arranged in plurality on imaginary lines of double circles on the center axis of said injection port plate.