Dynamical time division duplex uplink and downlink configuration in a communications network

1. An apparatus of an evolved Node B (eNB) operable to reconfigure a time division duplex (TDD) uplink and downlink (UL/DL) configuration for a user equipment (UE), the apparatus comprising one or more processors and memory configured to:

determine a set of configuration indication fields numbered 1 to N, included in a downlink control information (DCI) format Y carried on a physical downlink control channel (PDCCH), where

N

=

⌊

L

format

⁢

⁢

Y

M

⌋

,

 L format Y is equal to a payload size of the DCI format Y, and M is a number of bits of each indication field;

map the DCI format Y onto the PDCCH for transmission to the UE;

encode the PDCCH with a cyclic redundancy check (CRC) scrambled by an enhanced interference mitigation and traffic adaptation (eIMTA) Radio-Network Temporary Identifier (RNTI) for the UE; and

signal a transceiver of the eNB to transmit the encoded PDCCH to the UE.

2. The apparatus of claim 1 , further configured to signal a transceiver of the eNB to transmit to the UE, an UL/DL configuration indication for the TDD reconfiguration.

3. The apparatus of claim 1 , wherein the DCI format Y is a format 1C.

4. The apparatus of claim 1 , wherein M=3.

5. The apparatus of claim 1 , further configured to append one or more bits, with a predefined value of zero, to the set of configuration indication fields, until a total number of bits of the N configuration indication fields is equal to the payload size of the DCI format Y.

6. The apparatus of claim 1 , further configured to signal a transceiver of the eNB to send the eIMTA-RNTI to the UE to enable the UE to decode the physical downlink control channel (PDCCH).

7. The apparatus of claim 1 , further configured to indicate, to the UE, an index, for the set of configuration indication fields numbered 1 to N, a time domain duplex (TDD) UL-DL configuration index for a serving cell using radio resource control (RRC) signaling.

8. The apparatus of claim 1 , wherein the eNB is configured to decode, an indication from a UE, that the UE supports TDD UL-DL reconfiguration functionality.

9. The apparatus of claim 1 , wherein the DCI format Y is mapped onto a common search space (CSS) of the PDCCH for transmission to the UE.

10. An apparatus of a user equipment (UE) operable to reconfigure a time division duplex (TDD) uplink and downlink configuration, the apparatus comprising one or more processors and memory configured to:

process, at the UE, an uplink and downlink (UL/DL) configuration indication received from the eNB for the TDD reconfiguration, the UL/DL configuration indication comprising:

a set of configuration indication fields numbered 1 to N, included in a downlink control information (DCI) format Y carried on a physical downlink control channel (PDCCH), where

N

=

⌊

L

format

⁢

⁢

Y

M

⌋

,

 L format Y is equal to a payload size of the DCI format Y, and M is a number of bits of each indication field; and

decode, at the UE, an encoded PDCCH received from the eNB, wherein the DCI format Y is mapped onto the PDCCH, wherein the PDCCH is encoded with a cyclic redundancy check (CRC) scrambled with an enhanced interference mitigation and traffic adaptation (eIMTA) Radio-Network Temporary Identifier (RNTI) for the UE.

11. The apparatus of claim 10 , further comprising a transceiver configured to:

receive the UL/DL configuration indication from the eNB; and

receive the encoded PDCCH from the eNB.

12. The apparatus of claim 10 , wherein the DCI format Y is a format 1C.

13. The apparatus of claim 10 , wherein M=3.

14. The apparatus of claim 10 , wherein one or more bits are appended, with a predefined value of zero, to the set of configuration indication fields, until a total number of bits of the N configuration indication fields is equal to the payload size of the DCI format Y.

15. The apparatus of claim 10 , further configured to receive the eIMTA-RNTI from the eNB, wherein the UE is configured to decode the encoded PDCCH using the eIMTA-RNTI.

16. The apparatus of claim 10 , further configured receive an indication, from the eNB, of an index for a time domain duplex (TDD) UL-DL configuration index for a serving cell using radio resource control (RRC) signaling.

17. The apparatus of claim 10 , further configured to signal a transceiver of the eNB to send an indication to the eNB, wherein the indication specifies that the UE supports TDD UL-DL reconfiguration functionality.

18. The apparatus of claim 10 , wherein the UE includes an antenna, a touch sensitive display screen, a speaker, a microphone, a graphics processor, an application processor, an internal memory, or a non-volatile memory port.

19. The apparatus of claim 10 , wherein the DCI format Y is mapped onto a common search space (CSS) of the PDCCH for transmission to the UE.

20. At least one non-transitory machine readable storage medium having instructions embodied thereon for modifying an uplink/ downlink (UL/DL) configuration at a user equipment (UE) in a communications network, the instructions when executed perform the following:

requesting, using one or more processors at the UE, a radio resource control (RRC) connection with an eNodeB;

signaling, using the one or more processors at the UE, a UE Capability Information information element (IE) for transmission to the eNodeB, wherein the UE Capability IE indicates an enhanced interference mitigation and traffic adaptation (eIMTA) capability of the UE to support an eIMTA time duplex domain (TDD) UL/DL reconfiguration functionality; and

processing, using the one or more processors at the UE, eIMTA configuration information received from the eNodeB via a radio resource control (RRC) message, wherein the eIMTA configuration information is received in response to signaling the UE Capability IE to the eNodeB.

21. The at least one non-transitory machine readable storage medium of claim 20 , wherein the RRC message includes an eIMTA Radio-Network Temporary Identifier (RNTI).

22. The at least one non-transitory machine readable storage medium of claim 21 , further comprising instructions when executed perform the following:

attempting to decode an UL/DL reconfiguration PDCCH with a cyclic redundancy check (CRC) scrambled by the assigned eIMTA-RNTI; and

determining UL/DL configuration information from a decoded UL/DL reconfiguration PDCCH based on the assigned indicator field index.

23. The at least one non-transitory machine readable storage medium of claim 22 , wherein the UL/DL reconfiguration PDCCH includes N TDD UL/DL Configuration Indicator (TCI) fields, where N is determined using

N

=

⌊

L

format

⁢

⁢

Y

-

R

others

M

⌋

,

wherein L format Y is a payload size of an existing downlink control information (DCI) format Y before CRC attachment, R others ≧0 is a number of information bits used for selected functionalities, M is payload size for each UL/DL configuration indicator within UL/DL reconfiguration PDCCH, and format Y is mapped onto a common search space.

24. The at least one non-transitory machine readable storage medium of claim 23 , wherein zero-padding information bits are appended to TDD UL/DL configuration indicator fields until a UL/DL reconfiguration PDCCH size is equal to a format Y size mapped onto the common search space.

25. The at least one non-transitory machine readable storage medium of claim 21 , further comprising instructions when executed perform the following:

monitoring one common search space (CSS) on a Primary Cell (PCell) to receive the UL/DL reconfiguration PDCCH with CRC scrambled by the eIMTA-RNTI assigned for the UE.