Source: https://patents.google.com/patent/US9755809B2/en
Timestamp: 2019-12-09 18:13:51
Document Index: 378018604

Matched Legal Cases: ['Application No. 60', 'Application No. 201210153338', 'Application No. 201210153338', 'Application No. 201210153338', 'Application No. 201210153338', 'Application No. 201210153338']

US9755809B2 - Method and apparatus for interference control in a multi-cell communication system - Google Patents
Method and apparatus for interference control in a multi-cell communication system Download PDF
US9755809B2
US9755809B2 US14/210,223 US201414210223A US9755809B2 US 9755809 B2 US9755809 B2 US 9755809B2 US 201414210223 A US201414210223 A US 201414210223A US 9755809 B2 US9755809 B2 US 9755809B2
US14/210,223
US20140301220A1 (en
2007-06-12 Priority to US56906407A priority
2011-10-04 Priority to US13/252,990 priority patent/US8675563B2/en
2014-03-13 Application filed by Amazon Technologies Inc filed Critical Amazon Technologies Inc
2014-03-13 Priority to US14/210,223 priority patent/US9755809B2/en
2014-10-09 Publication of US20140301220A1 publication Critical patent/US20140301220A1/en
2017-09-05 Publication of US9755809B2 publication Critical patent/US9755809B2/en
2018-04-26 Assigned to WALTICAL SOLUTION, INC. reassignment WALTICAL SOLUTION, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUANG, HAIMING, LI, KEMIN, LI, XIAODONG, LO, TITUS, MENG, JUN
2018-04-26 Assigned to NEOCIFIC, INC. reassignment NEOCIFIC, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALTICAL SOLUTIONS, INC.
2018-04-26 Assigned to WALTICAL SOLUTIONS, INC. reassignment WALTICAL SOLUTIONS, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE'S NAME INSIDE DECLARATION PREVIOUSLY RECORDED AT REEL: 023491 FRAME: 0061. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: HUANG, HAIMING, LI, KEMIN, LI, XIAODONG, LO, TITUS, MENG, JUN
This application is a continuation application of U.S. patent application Ser. No. 13/252,990, filed Oct. 4, 2011, which is a continuation application of U.S. patent application Ser. No. 11/569,064, having a 371 date of Jun. 12, 2007, both of which are incorporated by reference. U.S. patent application Ser. No. 11/569,064 is a U.S. National Stage of International Application No. PCT/US05/23399, filed Jun. 29, 2005, which claims the benefit of U.S. Provisional Patent Application No. 60/584,215 filed on Jun. 30, 2004.
where Qcurrent denotes the current measured CQI at the receiver, Pmax denotes the maximum transmission power available at the transmitter, and P current denotes the current transmission power at the transmitter. Initially, Qnew is computed by assuming the maximum power is used at the transmitter. If Qnew exceeds the CQI requirement for the highest MCS in the protocol, the AMCP controller 710 selects the highest MCS and sets a necessary transmission power level (Pnew) for that MCS with a certain margin (block 1004). In other words, the control scheme clips the CQI spillover. This potentially minimizes the transmission power once the highest MCS has been achieved, so as to limit interference in other cells.
TABLE 1 Path Loss Serving Base Station 100 dB Adjacent Base Station 1 110 dB Adjacent Base Station 2 105 dB
TABLE 2 Path Loss Serving Base Station 90 dB Adjacent Base Station 1 130 dB Adjacent Base Station 2 135 dB
Q new =P current +R threshold −R current,
4. In a multi-carrier, multi-cell wireless communication system, a process of controlling transmission power of signal transmitters and modulation and coding scheme (MCS) of transmitted signals, the process comprising:
adaptively controlling the MCS of the transmitted signals and signal transmission powers of the corresponding multiple subchannels to substantially achieve a balance between increasing a capacity of a serving cell and reducing interference with other cells, wherein the adaptive control is based on rules and constraints derived from system parameters and performance measurements, wherein the adaptive control uses the rules to determine the signal transmission powers of the corresponding multiple subchannels at a signal transmitter of the serving cell providing the transmitted signals to a receiver based on interference information received from one or more signal transmitters of other serving cells and representing interference experienced by the one or more signal transmitters of other serving cells providing signals to corresponding receivers in the other serving cells.
the multi-carrier system comprises Orthogonal Frequency Division Multiplexing (OFDM), or Multi-Carrier Code Division Multiple Access (MC-CDMA); and
10. The process of claim 4, wherein the multiple subchannels includes a first subchannel, the signal transmitter of the serving cell providing a signal transmission power for the first subchannel that is higher than a signal transmission power for the first subchannel provided by the signal transmitters providing signals to corresponding receivers in the other serving cells.
11. In a multi-carrier, multi-cell communication system wherein a communication channel is configured into multiple subchannels and each subchannel includes multiple subcarriers, an apparatus for controlling transmission power and modulation and coding scheme (MCS) of transmitted signals, the apparatus comprising:
at least one controller configured to process input information and generate output signals for controlling transmission power and the MCS, wherein the controller uses a part or all of the inputs to generate the output signals, and wherein the output signals are sent to and employed by a transmitter in a next transmission, wherein the transmission powers of subchannels provided by the transmitter of a serving cell in the next transmission are based on interference information received from one or more transmitters of other serving cells and representing interference experienced by the one or more transmitters of other serving cells providing signals to corresponding receivers in the other serving cells; and
performance measurements, wherein the performance measurements are frequently varying and repeatedly updated; and
12. The apparatus of claim 11, wherein an Adaptive Modulation Coding and Power (AMCP) controller (a) selects a transmission power level that satisfies a Signal to Noise Ratio (SNR) or Rise over Thermal (RoT) threshold requirement and that achieves the highest modulation and coding scheme (MCS) for applications with adaptive MCS schemes, and (b) selects the corresponding MCS.
13. The apparatus of claim 11, wherein a SNR or RoT threshold is calculated using the cell configuration, frequency reuse factor, geometry and path-loss information, transmission priority, subchannel configuration, feedback from other cells, or any combination thereof; and wherein:
14. The apparatus of claim 13, wherein a common SNR or RoT threshold is first set for all active links in one direction to control the interference with close-by cells, and wherein the common SNR or RoT threshold is used as a constraint in the calculation of individual SNR or RoT thresholds for each link.
15. The apparatus of claim 13, wherein information pertaining to interference occurrences within a network is used by a base station to compute the SNR or RoT threshold.
16. The apparatus of claim 11, wherein a path-loss for a mobile station to its serving and/or adjacent base stations is determined from strength of downlink or uplink signals from and to the base station, wherein:
17. The apparatus of claim 11, wherein the inputs and outputs of the controller correspond to an individual subchannel in case each subchannel uses a modulation and coding and a power control different from those of other subchannels or correspond to a set of subchannels in case the set of subchannels use the same modulation and coding and power control to reduce the control overhead.
18. The apparatus of claim 11, wherein the multiple subchannels includes a first subchannel, the signal transmitter of the serving cell providing a signal transmission power for the first subchannel that is higher than a signal transmission power for the first subchannel provided by the signal transmitters providing signals to corresponding receivers in the other serving cells.
US14/210,223 2004-06-30 2014-03-13 Method and apparatus for interference control in a multi-cell communication system Active US9755809B2 (en)
US56906407A true 2007-06-12 2007-06-12
US13/252,990 US8675563B2 (en) 2004-06-30 2011-10-04 Method and apparatus for interference control in a multi-cell communication system
US14/210,223 US9755809B2 (en) 2004-06-30 2014-03-13 Method and apparatus for interference control in a multi-cell communication system
US20140301220A1 US20140301220A1 (en) 2014-10-09
US9755809B2 true US9755809B2 (en) 2017-09-05
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