Asymmetric TDD in flexible use spectrum

1. A method, comprising:

transmitting a first signal over a time division duplex (TDD) communication path via a first portion of a first frequency band;

receiving a second signal over the TDD communication path via a second portion of the first frequency band;

wherein the first portion uses a smaller spectrum bandwidth than the second portion;

wherein the first frequency hand is adjacent to a second frequency band;

wherein the second frequency band includes a second TDD communication path having a third portion and a fourth portion;

wherein a first guard band separates the first portion from each of the third portion and, for a limited time segment, the fourth portion;

wherein the first frequency band is adjacent to a third frequency band; and

wherein the third frequency band includes a third TDD communication path having a fifth portion and a sixth portion.

2. The method of claim 1 ,

wherein the first frequency band is mutually exclusive of and arises in-between the second frequency band and the third frequency band.

3. The method of claim 1 ,

wherein the second TDD communication path is temporally-asymmetric.

4. The method of claim 1 ,

wherein the third TDD communication path is temporally-asymmetric.

5. The method of claim 4 ,

wherein a second guard-band separates the first portion from at least one of the fifth portion and the sixth portion.

6. The method of claim 1 , comprising at least one of

transmitting a third signal over the third portion and

receiving a fourth signal over the fourth portion.

7. The method of claim 6 ,

wherein the transmitting of the first signal begins before the transmitting of the third signal begins and while the fourth signal is being received.

8. The method of claim 6 ,

wherein the receiving of the fourth signal occurs during a first period ranging from an initial time to a second time;

wherein the transmitting of the first signal occurs during a second period ranging from a first time to a third time; and

wherein the first time arises after the initial time and before the second time, and the third time arises after the second time.

9. The method of claim 8 , comprising at least one of

transmitting a fifth signal over the first portion and

receiving a sixth signal over the sixth portion.

10. The method of claim 9 ,

wherein the transmitting of the third signal and the transmitting of the fifth signal occur during a third period ranging from a second time to a third time;

wherein the first period arises before the third period; and

wherein, the receiving of the fourth signal occurs daring the first period.

11. The method of claim 6 , comprising:

receiving a sixth signal over the sixth portion; and

wherein the transmitting of the first signal begins while the sixth signal is being received.

12. The method of claim 1 ,

wherein the second portion is immediately adjacent to the fourth portion.

13. The method of claim 12 ,

wherein the second, portion is immediately adjacent to the sixth portion.

14. The method of claim 1 ,

wherein the first portion uses a smaller frequency range than the second portion.

15. A method, comprising:

sending a first signal over a first time division duplex (TDD) communication path via a first portion of a first frequency band;

receiving a second signal over the first TDD communication path via a second portion of the first frequency band different;

wherein the first portion of the first frequency band uses a larger spectrum bandwidth than the second portion of the first frequency band;

wherein the first frequency band is adjacent to and mutually exclusive of a second frequency band;

wherein the second frequency band includes a second TDD communication path that comprises a first temporally-asymmetric path including a third portion and a fourth portion;

wherein a first guard hand separates the first portion from each of the fourth portion and, for a limited time segment, the third portion;

wherein the first frequency band is adjacent to and mutually exclusive of a third frequency band;

wherein the third frequency band includes a third TDD communication path, that comprises a second temporally-asymmetric path including a fifth portion and a sixth portion; and

wherein a second guard band separates the first portion from each of the sixth portion and, for a limited time segment, the fit portion.

16. A method comprising,

sending a first signal over a first time division duplex (TDD) communication path via a first portion of a first frequency band;

receiving a second signal over the first TDD communication path via a second portion of the first frequency band different from the first portion of the first frequency band;

wherein the first frequency band is adjacent to a second frequency band and a third frequency band;

wherein, the first frequency band is different from the second frequency band and the third frequency band;

wherein the second frequency band includes a second TDD communication path;

wherein the second TDD communication path comprises a first temporally-asymmetric path including a third portion and a fourth portion;

wherein the third frequency band includes a third TDD communication path;

wherein the third TDD communication path comprises a second temporally-asymmetric path including a fifth portion and a sixth portion; and

wherein the third portion of the first temporally-asymmetric path is synchronous with the sixth portion of the second temporally-asymmetric path;

wherein a first guard band separates the first portion from:

each of the third portion and, for a limited time segment, the fourth portion; or

each of the fourth portion and, for a limited time segment, the third portion.

17. The method of claim 16 ,

wherein the first portion of the first frequency band uses a smaller spectrum bandwidth than the second portion of the first frequency band.

18. The method of claim 16 ,

wherein the first portion of the first frequency band uses a larger spectrum bandwidth than the second portion of the first frequency band.