Source: http://www.google.ca/patents/US9288814
Timestamp: 2018-01-23 14:03:28
Document Index: 723155120

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

Patent US9288814 - Interface management in wireless communication system using hybrid time reuse - Google Patents
Interference that occurs during wireless communication may be managed by hybrid time reuse. A method, apparatus amend medium of communication determines one or more time reuse patterns of respective one or more unplanned access points. A second time reuse pattern that is less interfering with the one...http://www.google.ca/patents/US9288814?utm_source=gb-gplus-sharePatent US9288814 - Interface management in wireless communication system using hybrid time reuse
Publication number US9288814 B2
Application number US 14/307,382
Also published as CA2706698A1, CA2706875A1, CA2706876A1, CA2706876C, CA2706877A1, CA2706877C, CN101926193A, CN101926193B, CN101926194A, CN101926194B, CN101926195A, CN101926195B, CN101926207A, CN101926207B, CN103458490A, CN103813432A, CN103813432B, EP2215874A2, EP2218274A1, EP2218276A2, EP2220878A2, EP2220878B1, EP2755414A1, US8837305, US8848619, US8867456, US9072102, US20090135754, US20090135790, US20090135796, US20090137221, US20090137241, US20140376520, WO2009070608A2, WO2009070608A3, WO2009070610A2, WO2009070610A3, WO2009070614A2, WO2009070614A3, WO2009070618A1
Publication number 14307382, 307382, US 9288814 B2, US 9288814B2, US-B2-9288814, US9288814 B2, US9288814B2
Inventors Mehmet Yavuz, Peter Black, Sanjiv Nanda
Patent Citations (318), Non-Patent Citations (23), Classifications (29), Legal Events (1)
US 9288814 B2
measuring signals from a macro cell and one or more neighboring femto cells;
identifying a hybrid automatic repeat request (HARQ) interlace that exhibits the least interference;
identifying a subframe based on the identified HARQ interlace;
determining one or more time reuse patterns of the one or more neighboring femto cells;
transmitting signals according to the second time reuse pattern from a second femto cell to an associated user equipment.
2. The method of claim 1, further comprising identifying a primary femto channel based at least in part on the identified subframe.
3. The method of claim 1, wherein transmitting signals comprises transmitting signals on a primary femto channel.
4. The method of claim 1, further comprising establishing time synchronization at the second femto cell with a macro cell.
5. The method of claim 1, further comprising transmitting on pilot channels corresponding to the one or more time reuse patterns.
6. An apparatus for communication, comprising:
an interference controller configured to:
measure signals from a macro cell and one or more neighboring femto cells,
identify a hybrid automatic repeat request (HARQ) interlace that exhibits the least interference,
identify a subframe based on the identified HARQ interlace,
determine one or more time reuse patterns of the one or more neighboring femto cells, and
a communication controller configured to transmit signals according to the second time
reuse pattern from a second femto cell to an associated user equipment.
7. The apparatus of claim 6, wherein the interference controller is further configured to identify a primary femto channel based at least in part on the identified subframe.
8. The apparatus of claim 6, wherein transmitting signals comprises transmitting signals on a primary femto channel.
9. The apparatus of claim 6, wherein the interference controller is further configured to establish time synchronization at the second femto cell with a macro cell.
10. The apparatus of claim 6, wherein the communication controller is further configured to transmit on pilot channels corresponding to the one or more time reuse patterns.
means for measuring signals from a macro cell and one or more neighboring femto cells;
means for identifying a hybrid automatic repeat request (HARQ) interlace that exhibits the least interference;
means for identifying a subframe based on the identified HARQ interlace;
means for determining one or more time reuse patterns of the one or more neighboring femto cells;
means for transmitting signals according to the second time reuse pattern from a second femto cell to an associated user equipment.
12. The apparatus of claim 11, further comprising means for identifying a primary femto channel based at least in part on the identified subframe.
13. The apparatus of claim 11, wherein the means for transmitting signals comprise means for transmitting signals on a primary femto channel.
14. The apparatus of claim 11, further comprising means for establishing time synchronization at the second femto cell with a macro cell.
15. The apparatus of claim 11, further comprising means for transmitting on pilot channels corresponding to the one or more time reuse patterns.
measure signals from a macro cell and one or more neighboring femto cells;
identify a hybrid automatic repeat request (HARQ) interlace that exhibits the least interference;
identify a sub frame based on the identified HARQ interlace;
determine one or more time reuse patterns of the one or more neighboring femto cells;
transmit signals according to the second time reuse pattern from a second femto cell to an associated user equipment.
17. The non-transitory computer-readable medium of claim 16, further comprising codes for causing the computer to identify a primary femto channel based at least in part on the identified subframe.
18. The non-transitory computer-readable medium of claim 16, wherein the codes for causing the computer to transmit signals comprise codes for causing the computer to transmit signals on a primary femto channel.
19. The non-transitory computer-readable medium of claim 16, further comprising codes for causing the computer to establish time synchronization at the second femto cell with a macro cell.
20. The non-transitory computer-readable medium of claim 16, further comprising codes for causing the computer to transmit on pilot channels corresponding to the one or more time reuse patterns.
This application is a continuation application of U.S. patent application Ser. No. 12/276,932, entitled “Interface Management In Wireless Communication System Using Hybrid Time Reuse,” filed Nov. 24, 2008, which claimed the benefit of and priority to commonly owned U.S. Provisional Patent Application No. 60/990,541, filed Nov. 27, 2007, U.S. Provisional Patent Application No. 60/990,547, filed Nov. 27, 2007, U.S. Provisional Patent Application No. 60/990,459, filed Nov. 27, 2007, U.S. Provisional Patent Application No. 60/990,513, filed Nov. 27, 2007, U.S. Provisional Patent Application No. 60/990,564, filed Nov. 27, 2007, U.S. Provisional Patent Application No. 60/990,570, filed Nov. 27, 2007, the disclosure of each of which is hereby incorporated by reference herein.
U.S. patent application Ser. No. 12/276,894, entitled “INTERFERENCE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING BEAM AND NULL STEERING,”
U.S. patent application Ser. No. 12/276,897, entitled “INTERFERENCE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING OVERHEAD CHANNEL POWER CONTROL,”
U.S. patent application Ser. No. 12/276,906, entitled “INTERFERENCE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING FREQUENCY SELECTIVE TRANSMISSION,”
U.S. patent application Ser. No. 12/276,916, entitled “INTERFERENCE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING ADAPTIVE PATH LOSS ADJUSTMENT,” and
U.S. patent application Ser. No. 12/276,882, entitled “INTERFACE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING SUBFRAME TIME REUSE,” the disclosure of each of which is hereby incorporated by reference herein.
As stated, in unplanned base station deployments with restricted association (i.e., a mobile station is not allowed to associate with the “closest” base station to which it has the strongest link), jamming and negative geometries can be common. In one exemplary embodiment spatially described in conjunction with FIG. 5B, the femto node 510A and femto node 510B are deployed in neighboring residences. Access terminals 520A-520C are permitted to associate and communicate with femto node 510A, but not with femto node 510B. Likewise, access terminals 520D-520E are permitted to associate and communicate with femto node 510B, but not with femto node 510A. Access terminals 520E-520G are not permitted to associate or communicate with either femto nodes 510A-510B. Access terminals 520E-520G may be associated with a macro cell access node 560 (FIG. 5A), or another femto node in another residence (not shown). Accordingly, such negative geometries respecting access-permitted femto nodes and neighboring access terminals may result if various interfering or jamming conditions on the uplink and downlink.
C/I(AT 520C at femto node 510A)=P 3max −L A3−(P 5 −L A5)(dB)
C/I(femtocell B at AT 5)=P B −L B5−(P A −L A5)(dB)
Ecp OPTIMAL = arg min Ecp [ Ecp + f ( Ecp ) ]
Ect OPTIMAL=ƒ(Ecp OPTIMAL)
T 2 P OPTIMAL = Ect OPTIMAL Ecp OPTIMAL .
As represented by block 918, the T2PFILTERED (e.g., EctFILTERED I EcpFILTERED) is monitored during the call. The purpose of filtering T2P would be to eliminate small scale fluctuations from the T2P calculation. E.g., a moving average filter can be used to filter Ect and Ecp values to compute EctFILTERED and EcpFILTERED respectively.
Ecp=Ect FILTERED /T2P OPTIMAL.
Ecp=max[Ect FILTERED /T2P OPTIMAL ,Ecp DEFAULT].
T2POPTIMAL depends on particular traffic configuration (rate, coding etc.). For example., if two users are performing voice calls with same rate vocoders, they would have same T2POPTIMAL. However if there is another user performing data transfer (e.g., 1xRTT data transfer at 153 kbps) it would require a different T2POPTIMAL. Once the T2POPTIMAL is determined for given user (based on its traffic type), then the algorithm automatically adjusts Ecp. The above algorithm is specified for one user. If there are multiple users, then the algorithm may result in different Ecp values for each user. However, overhead channels are common to all users and we can only have one Ecp setting. Thus the algorithm could be generalized to a multiple users case. By way of example, an “optimal” Ecpi for each user (i=1, . . . , N) in the system could be found as described above and then an actual Ecp could be decided as max(Ecp1, . . . , EcpN). Another option could be to find the optimal Ecp such that total power transmitted as overhead and traffic to all users is minimized. This would mean a modification of the calculation of box 814 to:
Ecp OPTIMAL = arg min Ecp [ Ecp + f 1 ( Ecp 1 ) + … + f N ( Ecp N ) ]
The optimal T2P may be obtained through simulations and once the T2P is decided, power control adjust Ect (which is part of standard 3 G operation) may be determined. Then the Ecp is adjusted to achieve/maintain optimal T2P. Specifically, two algorithms may run together: 1) the power control algorithm adjusting Ect and 2) the adjustment of Ecp described herein.
h 1 [n]=δ[n]+δ[n−2]+δ[n−4]
h 2 [n]=δ[n]+e j2π/3 δ[n−2]+e −j2π/3 δ[n−4]=δ[n]+(−0.5+j0.866)·δ[n−2]+(−0.5−j0.866)·[n−4]
h 3 [n]=δ[n]+e −j2π/3 δ[n−2]+e j2π/3 δ[n−4]==δ[n]+(−0.5−j0.866)·δ[n−2]+(−0.5+j0.866)·[n−4]
As represented by block 1004, a femto node 510 selects a default waveform upon initialization (e.g., power up) according to a defined selection process (e.g., randomization, randomly assigned by the network, etc.). The default waveform from the set of N transmit (downlink) waveforms. The default waveform is initially assigned as the preferred transmit waveform, T×WavePREFERRED.
For stable system operation on the uplink UL, RoT needs to be controlled. Typically, RoT is controlled to be around 5 dB and higher. High RoT values can cause significant performance degradation. For example, in FIG. 5B for the two neighboring cells formed by femto nodes 510A and 510B, high RoT caused by access terminal 520D at femto node 510A results in performance degradation for associated access terminal 20C. One specific interfering scenario occurs when neighbor access terminal 520D has bursty uplink UL traffic and exhibits overly high power levels (e.g., in close proximity) at femto node 510A. Accordingly, during high rate data uplink UL bursts from access terminal 520D, the RoT at femto node 510A goes above 20 dB. Furthermore, the uplink UL power control mechanism in CDMA systems (e.g., CDMA2000, WCDMA, 1xEV-DO) is design to combat this type of interference scenarios. However due to excessive variation in RoT, the mechanism may take some time for femto node 510A to power control associated access terminal 520C to overcome the interference caused by non-associated access terminal 520D. Meanwhile the signal-to-interference ratio (SIR) of associated access terminal 520C falls below required levels resulting in consecutive packet errors on the uplink UL from associated access terminal 520C to home femto node 510A.
Ior ( n ) = ∑ i ∈ InCell Ec i ( n )
max ( Ecp ( n ) Nt ( n ) ) _ = max i ∈ i n - cell access terminals [ filter ( Ecp i ( n ) Nt i ( n ) ) ]
( Ioc ( n ) No ( n ) ) _ = filter ( Ioc ( n ) No ( n ) )
EcpNt_excess = max ( Ecp ( n ) Nt ( n ) ) _ - EcpNt_target
Ioc_excess = ( Ioc ( n ) No ( n ) ) _ - Ioc_target
PL_cand 1 = Ior_excess PL_cand 2 = { 0 , 0 ≥ EcpNt_excess EcpNtbased_PL _step , 0 < EcpNt_excess PL_cand 3 = PL_cand ( n - 1 ) - PL_step _down PL_cand = max ( PL_cand 1 , PL_cand 2 , PL_cand 3 )
As represented by block 1206, an access terminal 520 establishes an active connection with a femto node 510. In response to establishing the connection, the access terminal 520 provides a “fast” per-subframe downlink (forward link) power control feedback allowing the femto node 510 l to select a desired non-overlapping gating sequence.
The teachings herein may be incorporated into various types of communication systems and/or system components. In some aspects, the teachings herein may be employed in a multiple-access system capable of supporting communication with multiple users by sharing the available system resources (e.g., by specifying one or more of bandwidth, transmit power, coding, interleaving, and so on). For example, the teachings herein may be applied to any one or combinations of the following technologies: Code Division Multiple Access (“CDMA”) systems, Multiple-Carrier CDMA (“MCCDMA”), Wideband CDMA (“W-CDMA”), High-Speed Packet Access (“HSPA,” “HSPA+”) systems, Time Division Multiple Access (“TDMA”) systems, Frequency Division Multiple Access (“FDMA”) systems, Single-Carrier FDMA (“SC-FDMA”) systems, Orthogonal Frequency Division Multiple Access (“OFDMA”) systems, or other multiple access techniques. A wireless communication system employing the teachings herein may be designed to implement one or more standards, such as IS-95, cdma2000, IS-856, W-CDMA, TDSCDMA, and other standards. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (“UTRA)”, cdma2000, or some other technology. UTRA includes W-CDMA and Low Chip Rate (“LCR”). The cdma2000 technology covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (“GSM”). An OFDMA network may implement a radio technology such as Evolved UTRA (“E-UTRA”), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM®, etc. UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunication System (“UMTS”). The teachings herein may be implemented in a 3GPP Long Term Evolution (“LTE”) system, an Ultra-Mobile Broadband (“UMB”) system, and other types of systems. LTE is a release of UMTS that uses E-UTRA. Although certain aspects of the disclosure may be described using 3GPP terminology, it is to be understood that the teachings herein may be applied to 3GPP (Re199, Re15, Re16, Re17) technology, as well as 3GPP2 (1xRTT, 1xEV-DO RelO, RevA, RevB) technology and other technologies.
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International Classification H04W56/00, H04L5/00, H04W52/24, H04W52/44, H04L1/18, H04W74/04, H04W52/38, H04W52/20, H04W28/04, H04W52/14, H04W72/08, H04W52/32
Cooperative Classification H04W52/32, H04W56/001, H04W52/244, H04W52/38, H04W56/0025, H04W52/322, H04W56/0015, H04W52/44, H04W52/20, H04L1/1825, H04L5/0092, H04W52/143, H04W72/082, Y02B60/50, H04W74/04, H04W52/325, H04W28/04
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAVUZ, MEHMET;BLACK, PETER J.;NANDA, SANJIV;SIGNING DATES FROM 20081211 TO 20081221;REEL/FRAME:033234/0299