Full duplex communication system using disjoint spectral blocks

• US 9,083,436 B2
• Filed: 03/04/2005
• Issued: 07/14/2015
• 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:
  US11/072,703
• Publication Number:
  US 20050195758A1
• Time in Patent Office: 3,784 Days
• Field of Search: 370/329, 370/342, 370/444, 370/485, 370/208, 370/320, 370/335, 370/360, 370/436, 370/478, 370276-281, 455/452.1, 455/450, 455/419, 455/435, 375/131
• 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 circuit configured to receive in a first time interval a first orthogonal frequency division multiple access (OFDM) waveform in a first frequency band over a first plurality of subcarriers and at a same time receive a second OFDM waveform 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) allocated spectral bands and a number of the first plurality of subcarriers differs from the second plurality of subcarriers;

wherein the first and second OFDM waveform include data from a same source;

wherein the at least one circuit is further configured to recover the same source data from the first OFDM waveform and the second OFDM waveform; and

wherein the at least one 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 at least one 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 first frequency band and the second frequency band are in different spectrum blocks.

5. The wireless transmit/receive unit of claim 1 wherein the different spectrum blocks are non-contiguous.

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

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) waveform in a first frequency band over a first plurality of subcarriers and at a same time receiving, by the WTRU, a second OFDM waveform 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) allocated spectral bands and a number of the first plurality of subcarriers differs from the second plurality of subcarriers;

wherein the first and second OFDM waveform include data from a same source;

recovering, by the WTRU, the same source data from the first OFDM waveform and the second OFDM waveform; and

receiving, by the WTRU, adaptively assigned frequency bands for reception on a time interval basis.

8. The method of claim 7 wherein the first frequency band and the second frequency band are in different spectrum blocks.

9. The method of claim 7 wherein the different spectrum blocks are non-contiguous.

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

11. A base station comprising:

at least one circuit configured to split data and transmit in a first time interval a first portion of the split data in a first orthogonal frequency division multiple access (OFDM) waveform in a first frequency band over a first plurality of subcarriers to a wireless transmit/receive unit (WTRU) and at a same time transmit a second portion of the split data in a second OFDM waveform 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) allocated spectral bands and a number of the first plurality of subcarriers differs from the second plurality of subcarriers;

wherein the first and second OFDM waveform include data from a same source; and

wherein the at least one 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 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 first frequency band and the second frequency band are in different spectrum blocks.

15. The base station of claim 11 wherein the different spectrum blocks are non-contiguous.

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