Apparatus and method for increasing cell capacity through optional signal combining between relay stations in a cellular system using wired relay stations
First Claim
1. A method for increasing cell capacity through optional signal combining between Relay Stations (RSs) in a cellular system using wired RSs, the method comprising:
- receiving, by a Base Station (BS), an average Carrier-to-Interference ratio (C/I) value of transmission signals from Mobile Stations (MSs) located inside each coverage area, being fed back from the RSs or the MSs in its corresponding cell;
classifying the MSs into two groups according to the C/I value;
performing resource allocation satisfying a minimum data rate from a corresponding RS, for MSs belonging to a group having a C/I value greater than a preset threshold .GAMMA. among the classified groups;
performing resource allocation by applying an optional signal combining scheme taking into account a combination of two RSs having a highest C/I value, for MSs belonging to a group having a C/I value below the threshold among the classified groups by;
applying signal combining of the RS with the highest C/I value and the RS with the second highest C/I value, if α
×
Ck′
,n′
,s1<
Ck′
,n′
,s1,2 is satisfied; and
allocating corresponding subchannels only for the RS with the highest C/I value if α
×
Ck′
,n′
,s1<
Ck′
,n′
,s1,2 is not satisfied, whereinα
is a parameter related to signal combining condition, an MS having a highest C/I value in a corresponding group is defined as k′
, an RS with a highest C/I value and an RS with a second highest C/I value are defined as s1 and s2, respectively, and a subchannel corresponding to a maximum value of transmittable bits among available subchannels n for k′ and
s1 is defined as n′
,ck,n,s is defined as a number of transmission bits satisfying a target Bit Error Rate (BER) taking into account a signal level for a subchannel #n that an MS #k has received from an RS #s, andallocating all unallocated subchannels of each individual RS in an order of an MS having a high C/I value among MSs of a corresponding RS until there is no more unallocated subchannel of each RS.
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Accused Products
Abstract
A method, apparatus and system for increasing cell capacity through optional signal combining between Relay Stations (RSs) in a cellular system using wired RSs is disclosed. The method includes receiving, by a Base Station (BS), an average Carrier-to-Interference ratio (C/I) value of transmission signals from Mobile Stations (MSs) located inside each coverage area, being fed back from the RSs or the MSs in its corresponding cell; classifying the MSs into two groups according to the C/I value; performing resource allocation satisfying a minimum data rate from a corresponding RS, for MSs belonging to a group having a C/I value greater than a preset threshold Γ among the classified groups; performing resource allocation by applying an optional signal combining scheme taking into account two RSs having a highest C/I value, for MSs belonging to a group having a C/I value below the threshold among the classified groups; and allocating all unallocated subchannels of each individual RS in an order of an MS having a high C/I value among MSs of a corresponding RS until there is no more unallocated subchannel of each RS.
13 Citations
19 Claims
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1. A method for increasing cell capacity through optional signal combining between Relay Stations (RSs) in a cellular system using wired RSs, the method comprising:
-
receiving, by a Base Station (BS), an average Carrier-to-Interference ratio (C/I) value of transmission signals from Mobile Stations (MSs) located inside each coverage area, being fed back from the RSs or the MSs in its corresponding cell; classifying the MSs into two groups according to the C/I value; performing resource allocation satisfying a minimum data rate from a corresponding RS, for MSs belonging to a group having a C/I value greater than a preset threshold .GAMMA. among the classified groups; performing resource allocation by applying an optional signal combining scheme taking into account a combination of two RSs having a highest C/I value, for MSs belonging to a group having a C/I value below the threshold among the classified groups by; applying signal combining of the RS with the highest C/I value and the RS with the second highest C/I value, if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is satisfied; and
allocating corresponding subchannels only for the RS with the highest C/I value if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is not satisfied, whereinα
is a parameter related to signal combining condition, an MS having a highest C/I value in a corresponding group is defined as k′
, an RS with a highest C/I value and an RS with a second highest C/I value are defined as s1 and s2, respectively, and a subchannel corresponding to a maximum value of transmittable bits among available subchannels n for k′ and
s1 is defined as n′
,ck,n,s is defined as a number of transmission bits satisfying a target Bit Error Rate (BER) taking into account a signal level for a subchannel #n that an MS #k has received from an RS #s, and allocating all unallocated subchannels of each individual RS in an order of an MS having a high C/I value among MSs of a corresponding RS until there is no more unallocated subchannel of each RS. - View Dependent Claims (2, 3, 4, 12, 13)
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5. A system for increasing cell capacity through optional signal combining between Relay Stations (RSs) in a cellular system using wired RSs, the system comprising:
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a Base Station (BS) for receiving a signal of a Mobile Station (MS) from each of the RSs and the MS, and transmitting data to each of the RSs and the MS depending on the received signal; a plurality of wired RSs for delivering information on MSs in corresponding coverage to the BS, and performing resource allocation to corresponding MSs, a plurality of wired RSs for delivering information regarding MSs in corresponding coverage areas to the BS, and performing resource allocation to corresponding MSs, wherein a first method of resource allocation is performed on a group of MSs having a carrier/interference ratio (C/I) value greater than a threshold and a second method of resource allocation is performed on a group of MSs having a (C/I) value less than the threshold, by; classifying the MSs into two groups according to the C/I value; applying signal combining of the RS with the highest C/I value and the RS with the second highest C/I value, if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is satisfied;allocating corresponding subchannel only for the RS with the highest C/I value if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is not satisfied, whereinα
is a parameter related to signal combining condition, an MS having a highest C/I value in a corresponding group is defined as k′
, an RS with a highest C/I value and an RS with a second highest C/I value are defined as s1 and s2, respectively,ck,n,s is defined as a number of transmission bits satisfying a target Bit Error Rate (BER) taking into account a signal level for a subchannel #n that an MS #k has received from an RS #s, and a subchannel corresponding to a maximum value of transmittable bits among available subchannels n for k′ and
s1 is defined as n′
; anda plurality of MSs for receiving resources allocated from each of the RSs and updating the resource allocation information. - View Dependent Claims (6, 7)
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8. An apparatus for increasing cell capacity through optional signal combining between Relay Stations (RSs) in a cellular system using wired RSs, the apparatus comprising:
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a processor in communication with a memory, the memory including code therein which provides instruction to said processor to cause the processor to execute; determining an average Carrier-to-Interference ratio (C/I) value of transmission signals from Mobile Stations (MSs) located inside each coverage area, being fed back from the RSs or the MSs in its corresponding cell; classifying the MSs into two groups according to the average C/I value; performing resource allocation satisfying a minimum data rate from a corresponding RS, for MSs belonging to a group having a C/I value greater than a preset threshold .GAMMA. among the classified groups; performing resource allocation by applying an optional signal combining scheme taking into account a combination of two RSs having a highest C/I value, for MSs belonging to a group having a C/I value below the threshold among the classified groups by; applying signal combining of the RS with the highest C/I value and the RS with the second highest C/I value, if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is satisfied; andallocating corresponding subchannels only for the RS with the highest C/I value if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is not satisfied, whereinα
is a parameter related to signal combining condition, an MS having a highest C/I value in a corresponding group is defined as k′
, an RS with a highest C/I value and an RS with a second highest C/I value are defined as s1 and s2, respectuvely, and a subchannel corresponding to a maximum value of transmittable bits among available subchannels n for k′ and
s1 is defined as n′
;Ck n s is defined as a number of transmission bits satisfying a target Bit Error Rate (BER) taking into account a signal level for a subchannel #n that an MS #k has received from an RS #s, and allocating all unallocated subchannels of each individual RS in an order of an MS having a high C/I value among MSs of a corresponding RS until there is no more unallocated subchannel of each RS. - View Dependent Claims (9, 10, 11)
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14. A method for resource allocation in a cellular communication system comprising:
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determining an average carrier-to-interference ratio (C/I) value from a plurality of signals received from mobile stations; allocating each of the plurality of mobile stations to a selected group, wherein allocation is based on said average carrier-to-interference ratio; allocating resources satisfying a minimum data rate from a group of mobile stations having a C/I value greater than a preset threshold; allocating resources by applying an optional signal combining scheme considering a combination of two remote stations having a highest C/I value for the mobile stations having a C/I value less than the preset threshold; the resource allocation comprising; applying signal combining of the RS with the highest C/I value and the RS with the second highest C/I value, if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is satisfied;allocating corresponding subchannel only for the RS with the highest C/I value if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is not satisfied, whereinα
is a parameter related to signal combining condition, an MS having a highest C/I value in a corresponding group is defined as k′
, an RS with a highest C/I value and an RS with a second highest C/I value are defined as s1 and s2, respectively,ck,n,s is defined as a number of transmission bits satisfying a target Bit Error Rate (BER) taking into account a signal level for a subchannel #n that an MS #k has received from an RS #s, and a subchannel corresponding to a maximum value of transmittable bits among available subchannels n for k′ and
s1 is defined as n′
; andallocating remaining unallocated subchannels of each to mobile stations having a high C/I value among mobile stations. - View Dependent Claims (15, 16)
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17. An apparatus for resource allocation in a cellular communication system comprising:
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a processor in communication with a memory, the memory including code which provides instruction to the processor to cause the processor to execute; determining an average carrier-to-interference ratio (C/I) value from a plurality of signals received from mobile stations; allocating each of the plurality of mobile stations to a selected group, wherein allocation is based on said average C/I value; allocating resources satisfying a minimum data rate from a group of mobile stations having a C/I value greater than a preset threshold; allocating resources by applying an optional signal combining scheme considering a combination of two remote stations having a highest C/I value for the mobile stations having a C/I value less than the preset threshold; the resource allocation comprising; applying signal combining of the RS with the highest C/I value and the RS with the second highest C/I value, if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is satisfied;allocating corresponding subchannel only for the RS with the highest C/I value if α
×
Ck′
,n′
,s1 <
Ck′
,n′
,s1,2 is not satisfied, whereinα
is a parameter related to signal combining condition, an MS having a highest C/I value in a corresponding group is defined as k′
, an RS with a highest C/I value and an RS with a second highest C/I value are defined s1 and s2, respectively,ck,n,s is defined as a number of transmission bits satisfying a target Bit Error Rate (BER) taking into account a signal level for a subchannel #n that an MS #k has received from an RS #s, and a subchannel corresponding to a maximum value of transmittable bits among available subchannels n for k′ and
s1 is defined as n′
; andallocating remaining unallocated subchannels of each to mobile stations having a high C/I value among mobile stations. - View Dependent Claims (18, 19)
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Specification