COGNITIVE INTERFERENCE MANAGEMENT IN WIRELESS NETWORKS WITH RELAYS, MACRO CELLS, MICRO CELLS, PICO CELLS AND FEMTO CELLS

• US 20150195843A1
• Filed: 03/18/2015
• Published: 07/09/2015
• Est. Priority Date: 03/20/2009
• Status: Active Grant

• Current Assignee: Centre of Excellence in Wireless Technology
• Original Assignee: Centre of Excellence in Wireless Technology
• Inventors: Kalyani, Sheetal, Kaimalettu, Sunil, Krishnan, Rajet, Akhtar, Nadeem, Milleth, Jeniston Deviraj Klutto, Kuchi, Kiran Kumar, Ramamurthi, Bhaskar
• Granted Patent: US 9,661,643 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 43/04 Processing captured monitoring data, e.g. for logfile generation
• CPC Class Codes: H04L 43/08 Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• 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: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Cognitive interference management in Cellular wireless network with relays and micro/pico/femto cells operated in distributed scheduling mode. A cellular system may use RS to improve capacity or for coverage extension. ARS relays the signals between BS 104 and MS by using wireless links between BS-RS and RS-MS during both downlink and uplink transmissions. Embodiments herein disclose a mechanism to explicitly indicate to the MS whether the MAC management messages sent by the BS to the MS are to inform it to perform scanning for interference measurement. Also, disclosed herein is a mechanism to explicitly indicate to the BS whether the message sent by the MS is related to interference measurement.

Claims

1. A method for interference management in heterogeneous/homogeneous communication networks, wherein said communication networks have one or more Base Stations (BS), Relay Stations (RS), Femto Base Stations (FBS), Pico Base Stations (PBS), and Micro Base Stations (MBS), said method comprising:

a User Equipment (UE) performing interference measurement for a specific group of said BS, RS, MBS, FBS, PBS and said UE sends said interference measurement to a serving said BS;

said serving BS classifying each said UE as either a victim UE of said RS, BS, FBS, PBS and MBS or as a safe UE based on said measurement received from said UE;

said serving BS sending to each of said BS, RS, MBS, FBS, PBS a list of victim UEs or RS derives its list of its victim UEs, from UL signaling; and

each of said RS, BS, FBS, PBS and MBS performing resource allocation for said UEs of said RS, BS, FBS, PBS and MBS, wherein said set of resources are partially or completely orthogonal to said resources in time and/or frequency and/or code and/or space utilized by said victim UEs of said RS, BS, FBS, PBS and MBS.

2. The method as claimed in claim 1, wherein said BS, RS, MBS, FBS, PBS reads relevant resource allocation information messages of said victim UEs and uses said information to performing resource allocation for other associated said UEs of BS, RS, MBS, FBS, PBS.

3. The method as claimed in claim 1, wherein user data is repeated in original form or in modified form in a link between said BS, RS, MBS, FBS, PBS and particular said UEs, wherein said data repetition is to reduce any possible loss in performance in said access link due to unavailability of preferred band due to orthogonalization of resources, and/or power control in said access link to reduce said interference, wherein said data is repeated in correlated and/or uncorrelated blocks of time and/or frequency and/or space and/or code.

4. The method as claimed in claim 1, wherein said UE detects presence of said RS or said MBS, PBS and FBS in vicinity from said preamble and said UE reports said unique identifier, said RSSI and/or said Carrier to Interference-plus-Noise Ratio (CINR) and/or said function of RSSI/CINR to said BS using a control message, wherein said Received Signal Strength Indication (RSSI) and said CINR are measured from said preamble for each said BS/RS/MBS/FBS/PBS in the group to be scanned by the said UE, specified by the said serving BS.

5. The method as claimed in claim 4, wherein said control message informs said RS about said UE experiencing non negligible interference from said RS.

6. The method as claimed in claim 4, wherein said control message from said serving BS forwards said identifiers and resource allocation information of victim UEs to said MBS, PBS and FBS through a backhaul link or over the air interface.

7. The method as claimed in claim 1, wherein said BS, RS, MBS, FBS, PBS enables dynamic resource allocation using multiple information elements in said heterogeneous/homogeneous communication networks, wherein at least one of said multiple information elements comprising:

one of said multiple information element is used to request any group of said BS, RS, T-RS, MBS, FBS, PBS to allocate, bar, add or subtract resources to be used in said access link;

one of said multiple information element is used to request for resource allocation information of any group of said BS, RS, T-RS, MBS, FBS, PBS;

one of said multiple information element is used to convey resource allocation information of said BS, RS, T-RS, MBS, FBS, PBS to requesting said BS, RS, T-RS, MBS, FBS, PBS; and

one of said multiple information element is used by said serving BS to allocate, bar, add or subtract resource to be used by said BS, RS, T-RS, MBS, FBS, PBS in said access link.

8. The method as claimed in claim 7, wherein resource allocation information of victim UEs is shared between said BS, RS, T-RS, MBS, FBS, PBS.

9. The method as claimed in claim 7, wherein message containing said information element containing said resource allocation information of victim UEs is forwarded to said BS, RS, MBS, FBS, PBS through a backhaul link or over the air.

10. The method as claimed in claim 7, wherein message containing said information elements is sent from said BS or an entity (resource controller) in said network indicating a set of resources said RS, MBS, FBS, PBS can use in said access link.

11. The method as claimed in claim 10, wherein said set of resources is function of various metrics, wherein said metrics comprise at least one of:

system load;

interference measurement;

best band constraints;

Quality of Service (QoS) requirements;

persistent scheduling; and

traffic distribution for said RS and said BS.

12. The method as claimed in claim 7, wherein said information elements have at least one of:

RS/T-RS/BS/PBS/FBS/MBS Unique Identifier;

Number of non-contiguous allocations;

Type of Allocation field;

Offset in units of the minimum possible resource unit in frequency;

Offset in units of the minimum possible resource unit in time;

The amount by which the transmit power has to be increased or decreased;

Duration for which the resource allocation is valid;

Number of units of the minimum possible resource unit in time;

Number of units of the minimum possible resource unit in frequency;

Code sequence to be used; and

Antenna transmission mode.

13. The method as claimed in claim 7, wherein message containing said information elements may contain multiple said information elements, wherein said information elements comprise multiple allocations for said RS, T-RS, MBS, FBS, PBS.

14. The method as claimed in claim 7, wherein message containing said information elements are used to bar resources from being used by said RS, T-RS, MBS, FBS, PBS.

15. The method as claimed in claim 7, wherein message containing one of said information element is signaled by said RS, T-RS, MBS, FBS, PBS to a serving BS to request allocation and/or addition and/or subtraction and/or de-allocation of resources for its access link.

16. The method as claimed in claim 7, wherein message containing one of said information element is signaled by BS, RS, MBS, PBS, FBS to another BS, RS, T-RS, MBS, FBS, PBS or its serving BS to request barring or de-allocation of resources for their access link.

17. The method as claimed in claim 7, wherein said RS, T-RS, MBS, FBS, PBS requests for additional resources using control messages.

18. The method as claimed in claim 7, wherein message containing one of said information element is used to request for information about resources allocated to said RS, T-RS, MBS, FBS, PBS.

19. The method as claimed in claim 7, wherein message containing one of said information element is used for at least one of:

performing contiguous/non-contiguous resource allocations and be able to add/subtract resources to/from said allocated resources;

indicating to said RS, T-RS, MBS, FBS, PBS whether to perform power control in the allocated resources; and

enabling said BSs to share resource allocation information of RS, T-RS and said MBS, PBS and FBS and victim UE with each other.