SINGLE CHANNEL FULL DUPLEX WIRELESS BASE STATION OR ACCESS POINT

• US 20180167191A1
• Filed: 06/28/2016
• Published: 06/14/2018
• Est. Priority Date: 06/28/2015
• Status: Active Grant

• Current Assignee: RF DSP, Inc.
• Original Assignee: RF DSP, Inc.
• Inventors: Liang, Ping, Zhu, Dengkui
• Granted Patent: US 10,523,406 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/0817 with multiple receivers and antenna path selection
• CPC Class Codes: H04B 7/0874 using subgroups of receive antennas
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• 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 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

This invention presents methods for wireless communication systems implementing SCFD operation comprising adaptively configuring FDPs based on the directional antennas at each BS; measuring the interference levels among UEs located in areas covered by an FDP and determining the UE group that transmits and receives data on the same time-frequency resource(s) under the same FDP; and measuring the channels among neighboring BSs to cancel the interferences between two BSs with SCFD operations.

Claims

1. A method for Single Channel Full Duplex (SCFD) in a wireless communication network to avoid intra-cell UE to UE interference comprising using one or more Full Duplex Pairs (FDPs) each of which comprises two directional antennas whose coverage areas are sufficiently separated with a gap;

one or more pairs of Tx chain and Rx chain being used at a SCFD BS;

the BS scheduling DL in one sector in the FDP and UL in the other sector of the FDP.

2. The method of claim 1 further comprising the gap between one FDP is covered by another FDP.

3. The method of claim 1 wherein the gap is selected such that if at least one of a first UE in the coverage area of a first antenna in a FDP and a second UE in coverage area of the second antenna in the FDP is not in the vicinity of the BS, then the interference caused by one of the UEs transmitting UL on the other UE receiving DL is sufficiently low.

4. The method of claim 3 further comprising avoiding selection and scheduling of a pair of UEs, one in each sector in an FDP, that are both in close distance to the BS for SCFD DL and UL transmission.

5. The method of claim 4 further comprising obtaining the RSS of each UE transmitting at the same power level and on the same frequency resource;

and avoiding selecting two UEs both of which have RSS above a threshold.

6. The method of claim 3 further comprising obtaining the RSS of each UE transmitting at the same power level and on the same frequency resource;

and selecting two UEs for SCFD operation that have a sufficiently large difference in the RSS.

7. The method of claim 1 further comprising a first pair of Tx chain and Rx chain dedicated to one FDP and a second pair of Tx chain and Rx chain dedicated to another FDP.

8. The method of claim 7 further comprising two or more pairs of Tx chain and Rx chain supporting two or more FDPs operating simultaneously, with neighboring FDPs using different frequency resources.

9. The method of claim 8 further comprising using configurable band-pass filter in a Rx chain to suppress out-band or adjacent band interference from a neighboring FPD.

10. The method of claim 8 further comprising using configurable band-pass filter in a Tx chain to suppress the transmission of out-band or adjacent band interference to neighboring FPD.

11. The method of claim 1 further comprising using one set of Tx chain and Rx chain equipped with band-pass filter to support two or more FDPs operating simultaneously with each FDP using different frequency ranges, or subsets of subcarriers.

12. The method of claim 1 further comprising coordinating neighboring cells at the cell edge to reduce inter-cell UE to UE interference.

13. The method of claim 12 wherein coordinating neighboring cells includes having UEs in neighboring cells using different frequency resources to avoid inter-cell UE to UE interference.

14. A method for SCFD in a MIMIO wireless communication network to avoid intra-cell UE to UE interference comprising two or more Tx chains and two or more Rx chains at a BS operate in SCFD mode with two or more Tx chains at the BS transmitting DL signals to one or more UE receiving chains, and two or more Rx chains at the BS receiving UL signals from one or more UE transmitting chains, all at the same time and using the same frequency resource;

the Tx chains and Rx chains at the BS being connected to directional antennas through a set of Tx-Rx switches wherein the directional antennas are grouped into one or more FDPs and each FDP comprising two groups of directional antennas covering non-overlapping areas, typically back to back and not bordering on sides of the coverage areas;

the switches connecting to antennas in one group in an FDP changing positions together so that the antennas are either all transmitting or all receiving; and

the BS operating in MIMO mode in an area covered by a plural antennas in a group of an FDP, using either spatial diversity or spatial multiplexing to increase the data throughput.

15. The method of claim 14 further comprising multiple FDPs using different frequency bands to allow partition and/or filling of the coverage areas by frequency while separating transmitting and receiving RF signals in an FDP by space to control UE to UE interference.

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