Apparatus and method for communication with time-shifted subbands

1. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to at least:

utilize orthogonal frequency-division multiplexing (OFDM) in communication, wherein subbands are component carriers;

utilize a given number of parallel subbands in the communication, where a transmission start timing in each of the subbands is time-shifted by a predetermined time offset compared to a neighboring subband, the predetermined time offset being a fifth of an orthogonal frequency-division multiplexing (OFDM) symbol length used in the communication; and

use every even subband of the given number of parallel subbands for data transmission to produce a symmetric time domain signal.

2. The apparatus of claim 1 , wherein the apparatus serves a cell in a cellular communication system, the apparatus being further configured to utilize different subband than the subband used in neighboring cells.

3. The apparatus of claim 1 , wherein the at least one memory and the computer code are further configured, with the at least one processor, to cause the apparatus to at least:

transmit information about the parallel subbands and the time-shifts of the subbands.

4. The apparatus of claim 1 , wherein the at least one memory and the computer code are further configured, with the at least one processor, to cause the apparatus to at least:

receive a message,

transmit a response to the message utilizing the sub band having an earliest transmission start time after the arrival of the message.

5. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to at least:

transmit a message to a base station of a communication system;

utilize orthogonal frequency-division multiplexing (OFDM) to receive a response to the message on one of a given number of parallel subbands, where a transmission start timing in each of the subbands is time-shifted by a predetermined time offset compared to a neighboring subband, wherein the predetermined time offset is a fifth of an orthogonal frequency-division multiplexing (OFDM) symbol length; and

use every even subband of the given number of parallel subbands for data transmission to produce a symmetric time domain signal.

6. The apparatus of claim 5 , wherein the at least one memory and the computer code are further configured, with the at least one processor, to cause the apparatus to at least:

receive information about the parallel subbands and the time-shifts of the subbands.

7. The apparatus of claim 5 , wherein the at least one memory and the computer code are further configured, with the at least one processor, to cause the apparatus to at least:

receive a scheduling message comprising an indication of the sub band the response is transmitted on.

8. The apparatus of claim 5 , wherein the at least one memory and the computer code are further configured, with the at least one processor, to cause the apparatus to at least: monitor the given number of parallel subbands to detect the response.

9. The apparatus of claim 5 , wherein the at least one memory and the computer code are further configured, with the at least one processor, to cause the apparatus to at least:

receive the response only on every n th OFDM subband, where n is an even positive integer; the response being transmitted in an OFDM symbol, and at least one of:

start demodulating and decoding the response after receiving half of the symbol length of the OFDM symbol when n equals two; and

start demodulating and decoding the response after receiving a quarter of the symbol length of the OFDM symbol when n equals four.

10. A method, comprising:

utilizing orthogonal frequency-division multiplexing (OFDM) in communication, wherein subbands are component carriers;

utilizing a given number of parallel subbands in the communication, where a transmission start timing in each of the subbands is time-shifted by a predetermined time offset compared to a neighboring subband, the predetermined time offset being a fifth of an orthogonal frequency-division multiplexing (OFDM) symbol length used in the communication; and

using every even subband of the given number of parallel subbands for data transmission to produce a symmetric time domain signal.

11. The method of claim 10 , further comprising:

transmitting information about the parallel subbands and the time-shifts of the subbands.

12. A method, comprising:

transmitting a message to a base station of a communication system;

utilizing orthogonal frequency-division, multiplexing (OFDM) in receiving a response to the message on one of a given number of parallel subbands, where a transmission start timing in each of the subbands is time-shifted by a predetermined time offset compared to a neighboring subband, the predetermined time offset being a fifth of an orthogonal frequency-division multiplexing (OFDM) symbol length used in the communication; and

using every even subband of the given number of parallel subbands for data transmission to produce a symmetric time domain signal.

13. The method of claim 12 , further comprising:

receiving information about the parallel subbands and the time-shifts of the subbands.

14. The method of claim 12 , further comprising:

receiving a scheduling message comprising an indication of the subbands the response is transmitted on.