Synchronized Interference Mitigation Scheme for Heterogeneous Wireless Networks

• US 20120140690A1
• Filed: 11/30/2011
• Published: 06/07/2012
• Est. Priority Date: 12/07/2010
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Choi, Jihwan P., Sun, Yakun, Lou, Hui-Ling
• Granted Patent: US 8,767,616 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: G01S 19/03 Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04J 11/0026 of multi-user interference
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04L 5/26 combined with the use of different frequencies
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a method of synchronizing time domain multiplexing interference mitigation schemes of at least a first, second, and third wireless communication link within a first, second, and third network, respectively, a first set of parameters defining a first set of time intervals is determined. The first set of time intervals is utilized to schedule transmissions of the first wireless communication link to reduce interference with transmissions of the second wireless communication link. A second set of parameters defining a second set of time intervals is determined. The second set of time intervals is utilized to schedule transmissions of the first wireless communication link to reduce interference with transmissions of the third wireless communication link. The second set of parameters is determined based at least in part on at least one of the first set of parameters.

Claims

1. A method of synchronizing time domain multiplexing interference mitigation schemes of at least a first wireless communication link within a first network, a second wireless communication link within a second network, and a third wireless communication link within a third network, the method comprising:

determining a first set of one or more parameters defining a first set of time intervals, wherein

the first set of time intervals is utilized to schedule data transmissions of the first wireless communication link to reduce interference with data transmissions of the second wireless communication link; and

determining a second set of one or more parameters defining a second set of time intervals, wherein

the second set of time intervals is utilized to schedule data transmissions of the first wireless communication link to reduce interference with data transmissions of the third wireless communication link, and

the second set of one or more parameters is determined based at least in part on at least one of the first set of one or more parameters.

2. A method according to claim 1, wherein

the first network is a first cell,

the first wireless communication link is between a first base station and a first user device,

the second network is a second cell at least partially overlapping an area of the first cell,

the second wireless communication link is between a second base station and a second user device, and

the third wireless communication link is between the first user device and at least one wireless communication device.

3. A method according to claim 2, wherein the third network is a WiFi network, a Bluetooth network, or a GPS network.

4. A method according to claim 1, wherein

the first network is a relay network,

the first wireless communication link is between a relay base station and a user device,

the second network is a donor cell,

the second wireless communication link is between a donor base station and the relay base station, and

the third wireless communication link is between the user device and at least one wireless communication device.

5. A method according to claim 1, wherein determining the first set of one or more parameters includes determining the first set of one or more parameters based on at least one of i) traffic demand and ii) a scheduling priority between the first network and the second network.

6. A method according to claim 1, wherein each of the first network and the second network is a part of a 3^rd Generation Partnership Project Long Term Evolution (3GPP LTE) Standard heterogeneous network.

7. A method according to claim 6, wherein

the first network is a first cell,

the first wireless communication link is between a first base station and a first user device,

the second network is a second cell at least partially overlapping an area of the first cell,

the second wireless communication link is between a second base station and a second user device,

the first set of time intervals includes almost blank subframe (ABS) subframes, and

the first set of one or more parameters includes at least an ABS frame period Pa, an ABS frame offset Qu, and a set Su of one or more ABS subframe locations within a frame.

8. A method according to claim 7, wherein

the second set of time intervals includes on-duration sleep mode time intervals,

the second set of one or more parameters includes at least an on-duration sleep mode time interval period Ps, an on-duration sleep mode time interval offset Qs, and an on-duration sleep mode time interval length Ls, and

determining the second set of one or more parameters includes

determining Ls based on at least one of i) traffic demand and ii) scheduling priority between the first cell and the third network,

setting Ps equal to Pa/K when in a first mode and Pa*K when in a second mode,

determining Qs such that Qs satisfies

Qs+Ls=(Qa+(Sa,min/Nsubframe)) mod Ps when in the first mode, and

(Qs+Ls) mod Pa=Qa+(Sa,min/Nsubframe) when in the second mode, and wherein

Pa, Qa, Ps, Qs, and Ls are normalized to a total length of the frame,

K is a positive integer,

Sa,min is a minimum subframe number in Sa, and

Nsubframe is a total number of subframes per frame.

9. A method according to claim 8, wherein the first mode corresponds to heavy measured or expected activity on the third network, and the second mode corresponds to light measured or expected activity on the third network.

10. A method according to claim 7, wherein

the second set of time intervals includes non-measurement gap time intervals,

the second set of one or more parameters includes at least a non-measurement gap time interval period Pg, a non-measurement gap time interval offset Qg, and a non-measurement gap time interval length Lg, and

determining the second set of one or more parameters includes

determining Lg based on at least one of i) traffic demand and ii) scheduling priority between the first cell and the third network,

setting Pg equal to Pa/K when in a first mode and Pa*K when in a second mode,

determining Qg such that Qg satisfies

Qg+Lg=(Qa+(Sa,min/Nsubframe)) mod Pg when in the first mode,

and

(Qg+Lg) mod Pa=Qa+(Sa,min/Nsubframe) when in the second mode,

and wherein

Pa, Qa, Pg, Qg, and Lg are normalized to a total length of the frame,

K is a positive integer,

Sa,min is a minimum subframe number in Sa, and

Nsubframe is a total number of subframes per frame.

11. A method according to claim 7, wherein

the second set of time intervals includes used hybrid automatic repeat request (HARQ) process subframes,

the second set of one or more parameters includes at least a used HARQ process period Phi and a used HARQ process offset Qhi, and

determining the second set of one or more parameters includes

setting Phi equal to Pa/K when in a first mode and Pa*K when in a second mode,

determining Qhi such that Qhi satisfies

Qhi+Lhi=(Qa+(Sa,min/Nsubframe)) mod Phi when in the first mode,

and

(Qhi+Lhi) mod Pa=Qa+(Sa,min/Nsubframe) when in the second mode, and wherein

Pa, Qa, Phi, and Qhi are normalized to a total length of the frame,

Lhi is equal to 1/Nsubframe,

K is a positive integer,

Sa,min is a minimum subframe number in Sa, and

Nsubframe is a total number of subframes per frame.

12. A method according to claim 6, wherein

the first network is a relay network,

the first wireless communication link is between a relay base station and a user device,

the second network is a donor cell,

the second wireless communication link is between the relay base station and a donor base station,

the first set of time intervals includes multi-cast broadcast single frequency network (MBSFN) subframes, and

the first set of one or more parameters includes at least an MBSFN frame period Pm, an MBSFN frame offset Qm, and a set Sm of one or more MBSFN subframe locations within a frame.

13. A method according to claim 12, wherein

determining the first set of one or more parameters includes determining the first set of one or more parameters based on at least one of i) traffic demand and ii) a scheduling priority between the relay network and the donor cell.

14. A method according to claim 12, wherein

the second set of time intervals includes on-duration sleep mode time intervals,

the second set of one or more parameters includes at least an on-duration sleep mode time interval period Ps, an on-duration sleep mode time interval offset Qs, and an on-duration sleep mode time interval length Ls, and

determining the second set of one or more parameters includes

determining Ls based on at least one of i) traffic demand and ii) scheduling priority between the relay network and the third network,

setting Ps equal to Pm/K when in a first mode and Pm*K when in a second mode,

determining Qs such that Qs satisfies

Qs+Ls=(Qm+(Sm,min/Nsubframe)) mod Ps when in the first mode,

and

(Qs+Ls) mod Pm=Qm+(Sm,min/ Nsubframe) when in the second mode, and wherein

Pm, Qm, Ps, Qs, and Ls are normalized to a total length of the frame,

K is a positive integer,

Sm,min is a minimum subframe number in Sm, and

Nsubframe is a total number of subframes per frame.

15. A method according to claim 12, wherein

the second set of time intervals includes non-measurement gap time intervals,

the second set of one or more parameters includes at least a non-measurement gap time interval period Pg, a non-measurement gap time interval offset Qg, and a non-measurement gap time interval length Lg, and

determining the second set of one or more parameters includes

determining Lg based on at least one of i) traffic demand and ii) scheduling priority between the relay network and the third network,

setting Pg equal to Pm/K when in a first mode and Pm*K when in a second mode,

determining Qg such that Qg satisfies

Qg+Lg=(Qm+(Sm,min/Nsubframe)) mod Pg when in the first mode,

and

(Qg+Lg) mod Pm=Qa+(Sm,min/Nsubframe) when in the second mode, and wherein

Pm, Qm, Pg, Qg, and Lg are normalized to a total length of the frame,

K is a positive integer,

Sm,min is a minimum subframe number in Sm, and

Nsubframe is a total number of subframes per frame.

16. A method according to claim 12, wherein

the second set of time intervals includes used hybrid automatic repeat request (HARQ) process subframes,

the second set of one or more parameters includes at least a used HARQ process period Phi and a used HARQ process offset Qhi, and

determining the second set of one or more parameters includes

setting Phi equal to Pm/K when in a first mode and Pm*K when in a second mode,

determining Qhi such that Qhi satisfies

Qhi+Lhi=(Qm+(Sm,min/Nsubframe)) mod Phi when in the first mode, and

(Qhi+Lhi) mod Pm=Qm+(Sm,min/Nsubframe) when in the second mode, and wherein

Pm, Qm, Phi, and Qhi are normalized to a total length of the frame,

Lhi is equal to 1/Nsubframe,

K is a positive integer,

Sm,min is a minimum subframe number in Sm, and Nsubframe is a total number of subframes per frame.

17. A method according to claim 1, further comprising:

causing the first set of one or more parameters and the second set of one or more parameters to be transmitted to a user device of the first wireless communication link and the third wireless communication link.

18. A wireless communication network device, comprising:

a network controller configured to

determine a first set of one or more parameters defining a first set of time intervals, wherein

the first set of time intervals is utilized to schedule data transmissions of a first wireless communication link within a first network to reduce interference with data transmissions of a second wireless communication link within a second network; and

determine a second set of parameters defining a second set of time intervals, wherein

the second set of time intervals is utilized to schedule data transmissions of the first wireless communication link to reduce interference with data transmissions of a third wireless communication link within a third network, and

the second set of parameters is determined based at least in part on at least one of the first set of one or more parameters.

19. A wireless communication network device according to claim 18, wherein the network controller is further configured to:

cause the first set of one or more parameters and the second set of parameters to be transmitted to a user device of the first wireless communication link and the third wireless communication link.

20. A method of synchronizing time domain multiplexing interference mitigation schemes of a heterogeneous cellular network and a coexisting wireless communication network, wherein the heterogeneous cellular network includes at least a first cell and a second cell, the method comprising:

determining a first set of one or more parameters defining a first set of time intervals, wherein

the first set of time intervals is utilized to schedule data transmissions associated with the first cell to reduce interference with data transmissions associated with the second cell; and

determining a second set of parameters defining a second set of time intervals, wherein

the second set of time intervals is utilized to schedule data transmissions associated with the first cell to reduce interference with data transmissions associated with the coexisting wireless communication network,

at least a first parameter of the second set of parameters is determined based on a measured or expected activity level in the coexisting wireless communication network, and

at least a second parameter of the second set of parameters is determined based at least in part on at least one of the first set of one or more parameters.

21. A method according to claim 20, wherein

the second cell at least partially overlaps an area of the first cell, and

the coexisting wireless communication network is a WiFi network, a Bluetooth network, or a GPS network.

22. A wireless communication network device, comprising:

a network controller configured to

determine a first set of one or more parameters defining a first set of time intervals, wherein

the first set of time intervals is utilized to schedule data transmissions associated with a first cell of a heterogeneous cellular network to reduce interference with data transmissions associated with a second cell of the heterogeneous cellular network; and

determine a second set of parameters defining a second set of time intervals, wherein

the second set of time intervals is utilized to schedule data transmissions associated with the first cell to reduce interference with data transmissions associated with a wireless communication network that coexists with the heterogeneous cellular network,

at least a first parameter of the second set of parameters is determined based on a measured or expected activity level in the wireless communication network, and

at least a second parameter of the second set of parameters is determined based at least in part on at least one of the first set of one or more parameters.

23. A wireless communication network device according to claim 22, wherein

the second cell at least partially overlaps an area of the first cell, and

the wireless communication network is a WiFi network, a Bluetooth network, or a GPS network.