1. A micro-porous polyolefin composite film formed by coating or laminating a solution containing a polymer binder and inorganic particles on a micro-porous polyolefin film as a base layer, wherein the polymer binder includes 50 to 90 wt % of a non-aqueous polymer having a glass transition temperature (Tg) of \u221260\xb0 C. to 0\xb0 C. and 50 to 10 wt % of an aqueous polymer having a melting point (Tm) or a glass transition temperature (Tg) of 200\xb0 C. or higher and a surface tension of 65 dynecm or less in a state of 0.5 wt % of an aqueous solution thereof at 20\xb0 C.
2. The micro-porous polyolefin composite film of claim 1, wherein the non-aqueous polymer includes at least one component selected from the group consisting of styrene-acrylics, styrene-butadiene, acrylics, vinyl acrylics, and a mixture thereof.
3. The micro-porous polyolefin composite film of claim 1, wherein the aqueous polymer is polyvinyl alcohol (PVA), a copolymer thereof, or a mixture thereof.
4. The micro-porous polyolefin composite film of claim 1, wherein the inorganic particle is at least one selected from the group consisting of alumina, aluminum hydroxide, silica, barium titanium oxide, magnesium oxide, magnesium hydroxide, clay, titanium oxide, glass powder, boehmite, and a mixture thereof.
5. The micro-porous polyolefin composite film of claim 4, wherein the inorganic particle has an average diameter (D50) of 0.1\u02dc2.0 \u03bcm.
6. The micro-porous polyolefin composite film of claim 1, wherein it has the following physical properties: a shrinkage rate in each of a machine direction and a transverse direction at 160\xb0 C. is 10% or less; a difference between a shutdown temperature of the micro-porous polyolefin composite film and a shutdown temperature of the micro-porous polyolefin film is 1\xb0 C. or lower; and a meltdown temperature is 190\xb0 C. or higher.
7. The micro-porous polyolefin composite film of claim 1, wherein it has the following physical properties: an adhesive strength of a porous coating layer with respect to the micro-porous polyolefin film is 1.5 Kgfcm2 or greater; an adhesion retention in an electrolyte is 80% or more, a permeability (Gurley) is 30 to 500 s; and a permeability increase ratio depending on the thickness of the porous coating layer is 30 sec\u03bcm or less.
8. The micro-porous polyolefin composite film of claim 1, wherein it satisfies the following physical properties: a shrinkage rate in each of a machine direction and a transverse direction at 160\xb0 C. is 10% or less; a difference between a shutdown temperature of the micro-porous polyolefin composite film and a shutdown temperature of the micro-porous polyolefin film is 1\xb0 C. or lower; a meltdown temperature of the micro-porous polyolefin composite film is 190\xb0 C. or higher; an adhesive strength of a porous coating layer with respect to the micro-porous polyolefin film is 1.5 Kgfcm2 or greater; and an adhesion retention in an electrolyte is 80% or more; a permeability (Gurley) is 30 to 500 s; and a permeability increase ratio depending on the thickness of the porous coating layer is 30 sec\u03bcm or less.
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 method for managing transmission resources in a cellular communications network comprising a plurality of cells, each associated with a base station, the network comprising at least two radio communications terminals, an authorized list of available transport formats being associated with each of the terminals, wherein the method comprises:
creating a shortened list for each of said terminals by implementing the following algorithm:
initializing an empty shortened list; and
scanning the authorized list of available transport formats associated with said terminal and for each transport format:
if, in said authorized list, there is a transport format for transporting a number of encoded information bits smaller than or equal to the number of encoded information bits transported by said transport format and having a spectral efficiency greater than that of said transport format,
then passing to the next transport format in said authorized list,
else, adding said transport format to said shortened list and passing to the next transport format in said authorized list; and
optimizing frequency resources used by said terminals present in said network, comprising sub-steps of:
selecting a specific transport format for each of said terminals from the shortened list of transport formats, and
allocating a frequency band to each of said terminals, dimensioned as a function of the selected transport format.
2. The method for managing according to claim 1, wherein said shortened list is determined and memorized in an apparatus of said network.
3. The method for managing according to claim 1, wherein said shortened list is dynamically determined in an apparatus of said network.
4. The method for managing according to claim 1, wherein said shortened list is transmitted to an apparatus of the network implementing the sub-step of selecting a specific transport format associated with said terminal.
5. The method for managing according to claim 1, wherein said network is an OFDMA type network.
6. The method for managing according to claim 1, and further comprising using the method to manage the frequency resources for uplinks.
7. The method for managing according to claim 1, wherein at least one of the cells of said network comprises at least two terminals and said step of optimizing optimizes the frequency resources used by said terminals present in said cell.
8. A radio communications terminal designed to be implemented in a cellular communications network comprising a plurality of cells, each associated with a base station, an authorized list of available transport formats being associated with said terminal, wherein said terminal comprises:
means for determining a shortened list for each of said terminals by implementing the following algorithm:
initializing an empty shortened list; and
scanning the authorized list of available transport formats associated with said terminal and for each transport format:
if, in said authorized list, there is a transport format for transporting a number of encoded information bits smaller than or equal to the number of encoded information bits transported by said transport format and having a spectral efficiency greater than that of said transport format,
then passing to the next transport format in said authorized list,
else, adding said transport format to said shortened list and passing to the next transport format in said authorized list; and
means for optimizing frequency resources used by said terminal present in said network, said means comprising:
means for selecting a specific transport format for the terminal from the shortened list of transport formats, and
means for allocating a frequency band to said terminal, dimensioned as a function of the selected transport format.
9. A base station designed to be implemented in a cellular communications network comprising a plurality of cells, the network comprising at least two radio communications terminals, an authorized list of available transport formats being associated with each of said terminals, wherein said base station comprises:
means for determining a shortened list for each of said terminals by implementing the following algorithm:
initializing an empty shortened list; and
scanning the authorized list of available transport formats associated with said terminal and for each transport format:
if, in said authorized list, there is a transport format for transporting a number of encoded information bits smaller than or equal to the number of encoded information bits transported by said transport format and having a spectral efficiency greater than that of said transport format,
then passing to the next transport format in said authorized list,
else, adding said transport format to said shortened list and passing to the next transport format in said authorized list; and
means for optimizing frequency resources used by said terminals present in said network, the means comprising:
means for selecting a specific transport format for each of the terminals from the shortened list of transport formats, and
means for allocating a frequency band to at least one of said terminals, dimensioned as a function of the selected transport format.
10. A computer program product recorded on a non-transitory computer-readable medium and executable by a processor, the program comprising program code instructions for implementation of a method for managing transmission resources in a cellular communications network comprising a plurality of cells each associated with a base station, the network comprising at least two radio communications terminals, an authorized list of available transport formats being associated with each of the terminals, wherein the method comprises:
creating a shortened list for each of said terminals by implementing the following algorithm:
initializing an empty shortened list; and
scanning the authorized list of available transport formats associated with said terminal and for each transport format:
if, in said authorized list, there is a transport format for transporting a number of encoded information bits smaller than or equal to the number of encoded information bits transported by said transport format and having a spectral efficiency greater than that of said transport format,
then passing to the next transport format in said authorized list,
else, adding said transport format to said shortened list and passing to the next transport format in said authorized list; and
optimizing frequency resources used by said terminals present in said network, comprising sub-steps of:
selecting a specific transport format for each of said terminals from the shortened list of transport formats, and
allocating a frequency band to each of said terminals, dimensioned as a function of the selected transport format.