Interference mitigation technique

• US 7,756,519 B2
• Filed: 05/06/2007
• Issued: 07/13/2010
• Est. Priority Date: 05/06/2007
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: DesignArt Networks Limited (Qualcomm, Inc.)
• Inventors: Touboul, Assaf, Barak, Oz
• Primary Examiner(s): Ly; Nghi H
• Application Number:
  US11/744,871
• Publication Number:
  US 20080274745A1
• Time in Patent Office: 1,164 Days
• Field of Search: 455/447, 455/422.1, 455/63.1, 455/114.1, 455/296
• US Class Current: 455/447
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 92/045 between access point and backbone network device

Abstract

A backhaul network for a mobile wireless network including a plurality of nodes forming links, the links utilizing a 1:n frequency re-use scheme in backhaul communication, where n equals 2 to about 16, wherein each link communicates over a different portion of an entire bandwidth of the network.

Claims

1. A backhaul network for a mobile wireless network including a plurality of clusters of nodes, each cluster including a feeder node coupled to a core network and at least one node coupled in multi-hop topology to the feeder node, the backhaul network comprising:

said nodes in each cluster forming links;

said links utilizing a 1;

n frequency re-use scheme in backhaul communication wherein an entire bandwidth of the network is divided by n, where n equals 2 to about 16, wherein each wireless backhaul link at an edge of a cluster communicates over a different portion of said bandwidth at a same time.

2. A method of reducing interference in a mobile wireless network including a plurality of clusters of nodes, each cluster including a feeder node coupled to a core network and at least one node coupled in multi-hop topology to the feeder node, the method comprising:

utilizing a 1;

n frequency reuse scheme in backhaul communication wherein an entire bandwidth of the network is divided by n, where n equals 2 to about 16, for at least two spatially adjacent nodes in the network having uncoordinated radio resources;

wherein each of said nodes transmits over a different portion of said entire bandwidth at a same time.

3. The method according to claim 2, wherein, during transmission between a feeder and a first tier node on one branch in the network over a bandwidth, a second tier node on a second branch communicates concurrently with a first tier node on said second branch over said bandwidth.

4. The method of reducing interference according to claim 2, the method comprising:

dividing each cluster into tiers, according to number of hops to the feeder, said outermost tier defining an edge of a cluster;

a first tier including all nodes coupled directly to the feeder;

additional tiers including all nodes coupled to said feeder via a relay node;

utilizing a 1;

1 frequency reuse scheme within innermost tiers in each cluster in wireless backhaul communication, wherein all nodes over an entire available bandwidth at different times; and

utilizing said 1;

n frequency re-use scheme in an outermost tier in wireless backhaul communication, wherein spatially close nodes in said outermost tier transmit at a same time over a different portion of said entire available bandwidth.

5. The method according to claim 4, wherein, during backhaul transmission between a feeder and a first tier node over said entire bandwidth, a second tier node coupled to a different first tier node communicates concurrently with said different first tier node over a portion of said bandwidth.

6. A mobile wireless network comprising:

a plurality of nodes, said nodes being coupled for wireless communication in virtual clusters of nodes,

each cluster including a feeder coupled to a core network,

a wireless link being formed between each pair of adjacent nodes, each node including at least one, and preferably a plurality of radio transceivers providing access communication and point-to-point in-band backhaul communication over the link;

a modem coupled to each transceiver;

a plurality of antennas mounted in the node, one coupled to each modem, the antennas being able to provide multiple concurrent transmissions over multiple antennas;

a controller in each node adapted and configured for control and coordination of the transceivers and associated modems;

means for creating sectorization of each node; and

an interference mitigation system between adjacent clusters during wireless backhaul communication comprising;

means for dividing each cluster into virtual tiers, according to number of hops to the feeder,

means for causing transmission utilizing a 1;

1 frequency re-use scheme during wireless backhaul communication within innermost tiers in each cluster, wherein all transmit over an entire available bandwidth at different times; and

means for causing transmission during wireless backhaul communication utilizing a 1;

n frequency re-use scheme in an outermost tier, where n is between 2 and about 16, wherein spatially close nodes in said outermost tier in adjacent clusters transmit at a same time over a different portion of said entire available bandwidth.

7. The backhaul network according to claim 6, wherein said wireless network is a WiMAX network according to Standard 802.16e2005, and further comprising conventional wired backhaul from said feeder to a core network.