Full duplex communication system using disjoint spectral blocks

• US 9,491,761 B2
• Filed: 07/07/2015
• Issued: 11/08/2016
• Est. Priority Date: 03/05/2004
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Chitrapu, Prabhakar R.
• Primary Examiner(s): Skripnikov, Alex
• Application Number:
  US14/793,294
• Publication Number:
  US 20150312914A1
• Time in Patent Office: 490 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/2615 using hybrid frequency-time division multiple access [FDMA-TDMA]
• CPC Class Codes: H04B 7/2618 using hybrid code-time division multiple access [CDMA-TDMA]
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 47/17 Interaction among intermediate nodes, e.g. hop by hop
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The invention involves utilizing pieces of disjoint spectral blocks. In one embodiment, a frequency division duplex approach is used, where each spectral block is utilized solely for either uplink or downlink communications. In another embodiment, a time division duplex approach is used, where each spectral block is time divided and uplink and downlink communications are assigned to different time slots within the same spectral blocks. In another embodiment, a code division duplex approach is utilized, where uplink and downlink communications are assigned different codes/hopping patterns within a same spectral block.

Claims

1. A wireless transmit/receive unit comprising:

at least one antenna;

an integrated circuit operatively coupled to the antenna;

the integrated circuit and the at least one antenna are configured to receive in a first time interval a first orthogonal frequency division multiple access (OFDM) signal in a first frequency band over a first plurality of subcarriers and at a same time receive a second OFDM signal in a second frequency band over a second plurality of subcarriers;

wherein the first frequency band and the second frequency band are in different Federal Communication Commission (FCC) spectral blocks;

wherein the integrated circuit is further configured to recover data from the first OFDM signal and the second OFDM signal; and

wherein the integrated circuit is further configured to be adaptively assigned frequency bands for reception on a time interval basis.

2. The wireless transmit/receive unit of claim 1 wherein the integrated circuit is further configured to vary a number of subcarriers utilized in the first and second frequency bands.

3. The wireless transmit/receive unit of claim 2 wherein the number of subcarriers is varied by nulling subcarriers.

4. The wireless transmit/receive unit of claim 1 wherein the different Federal Communication Commission (FCC) spectral bands are non-contiguous.

5. The wireless transmit/receive unit of claim 1 wherein the first OFDM signal and the second OFDM signal are received using multiple input multiple output and have different spatial domains.

6. The WTRU of claim 1 wherein the first OFDM signal or the second OFDM signal are received using time division duplex.

7. A method comprising:

receiving, by a wireless transmit/receive unit (WTRU), in a first time interval a first orthogonal frequency division multiple access (OFDM) signal in a first frequency band over a first plurality of subcarriers and at a same time receiving, by the WTRU, a second OFDM signal in a second frequency band over a second plurality of subcarriers;

wherein the first frequency band and the second frequency band are in different Federal Communication Commission (FCC) spectral blocks; and

recovering, by the WTRU, data from the first OFDM signal and the second OFDM signal;

wherein the WTRU is adaptively assigned frequency bands for reception on a time interval basis.

8. The method of claim 7 wherein the different Federal Communication Commission (FCC) spectral bands are non-contiguous.

9. The method of claim 7 wherein the first OFDM signal and the second OFDM signal are received using multiple input multiple output and have different spatial domains.

10. The method of claim 7 wherein the first OFDM signal or the second OFDM signal are received using time division duplex.

11. A base station comprising:

at least one antenna;

at least one integrated circuit;

the at least one integrated circuit configured to transmit in a first time interval first data in a first orthogonal frequency division multiple access (OFDM) signal in a first frequency band over a first plurality of subcarriers to a wireless transmit/receive unit (WTRU) and at a same time transmit second data in a second OFDM signal in a second frequency band over a second plurality of subcarriers to the WTRU;

wherein the first frequency band and the second frequency band are in different Federal Communication Commission (FCC) spectral blocks; and

wherein the at least one integrated circuit is further configured to adaptively assign frequency bands to transmit data to the WTRU on a time interval basis.

12. The base station of claim 11 wherein the at least one integrated circuit is further configured to vary a number of subcarriers utilized in the first and second frequency bands.

13. The base station of claim 12 wherein the number of subcarriers is varied by nulling subcarriers.

14. The base station of claim 11 wherein the different Federal Communication Commission (FCC) spectral bands are non-contiguous.

15. The base station of claim 11 wherein the first OFDM signal and the second OFDM signal are transmitted using multiple input multiple output and have different spatial domains.

16. The base station of claim 11 wherein the first OFDM signal or the second OFDM signal are transmitted using time division duplex.