Maximizing allowable flexible slot-to cell allocation by using adaptive antennas in a TDD system

• US 20040032850A1
• Filed: 12/30/2002
• Published: 02/19/2004
• Est. Priority Date: 08/15/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Marinier, Paul, Roy, Vincent
• Granted Patent: US 7,046,655 B2
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 92/20 between access points

Abstract

The present invention establishes a system on how to best use adaptive antennas at a base stations and optionally at wireless transmit receive units (WTRUs) to mitigate the interference due to conflicting slot assignments between two neighboring cells. This system will allow for a greater flexibility in slot-to-cell assignments, especially when conflicting slot assignments are for two cells or mobiles in the same vicinity, more specifically, one cell uses a slot assignment for an uplink while the other cell uses the same slot assignment for downlink.

Claims

1. A method to maximize the flexibility of slot to cell allocation in a TDD (time division duplex) UMTS system, comprising:

defining a plurality of zones amid a plurality of node-Bs; and

determining slot usage on a zone-by-zone basis to minimize interference caused by a conflicting uplink or a conflicting downlink assignment.

2. The method of claim 1, wherein a plurality of wireless transmit receive units (WTRUs) are incorporated into the plurality of node-Bs.

3. The method of claim 1, wherein said WTRUs location within said zone is determined using a signal delay at said node-Bs.

4. The method of claim 1, wherein said WTRUs'"'"' location within the zone is determined using a received power at said node-Bs.

5. A method to maximize the allowable flexible slot to cell allocation using adaptive antennas in a TDD (time division duplex), comprising:

defining a plurality of service dependent neighborhoods within a plurality of zones amid a plurality of node-Bs,

determining slot usage on a zone-by-zone basis to minimize interference caused by a conflicting uplink or a conflicting downlink assignment based upon.

6. A system to maximize the flexibility of slot to cell allocation in a TDD (time division duplex) UMTS system, comprising:

a plurality of zones amid a plurality of node-Bs; and

means for determining slot usage on a zone by zone basis to minimize interference caused by a conflicting uplink or a conflicting downlink assignment.

7. The system of claim 6, further comprising a plurality of WTRUs.

8. The system of claim 7, wherein said WTRUs'"'"' location within the zone is determined using a signal delay at said node-Bs.

9. The system of claim 7, wherein said WTRUs'"'"' location within the zone is determined using a received power at said node-Bs.

10. A method to maximize the allowable flexible slot to cell allocation using adaptive antennas in a TDD (time division duplex), comprising:

defining a plurality of service dependent neighborhoods within a plurality of zones amid a plurality of node-Bs; and

determining slot usage on a zone-by-zone basis to minimize interference caused by a conflicting uplink or a conflicting downlink assignment.