Method, an Apparatus and a Network Element for Dynamical TDD Configuration

1 . A method, comprising:

receiving at least one failed packet in a first time division duplex (TDD) configuration;

receiving information to change from the first TDD configuration to a second TDD configuration;

sending a repeat request for said at least one failed packet; and

receiving a retransmission of the failed packets of the first TDD configuration in the second TDD configuration.

2 . A method according to claim 1 , comprising flushing a hybrid automatic repeat request (HARQ) buffer after receiving information to change from the first TDD configuration to the second TDD configuration and receiving the retransmission of the failed packets of the first TDD configuration in the second TDD configuration as new packets.

3 . A method according to claim 2 , comprising using a specified number of HARQ processors and downlink association set index in the second TDD configuration, wherein the downlink is configured for asynchronous HARQ.

4 . A method according to claim 2 , comprising using a specified number of HARQ processors and implicit timing between physical uplink shared channel (PUSCH) and physical HARQ indicator channel/physical downlink control channel (PHICH/PDCCH) in the second TDD configuration, wherein the uplink is configured for synchronous HARQ.

5 . A method according to claim 1 , comprising a network element indicating to an apparatus for wireless communication a downlink process index, setting a new data (NDI) value to indicate the retransmission and combining received packets with packets in a corresponding hybrid automatic repeat request (HARQ) process buffer used in the first TDD configuration, wherein the downlink is configured for asynchronous HARQ.

6 . A method according to claim 1 , comprising mapping a first uplink subframe in the second TDD configuration after a downlink feedback timing, adding a predetermined time period to the feedback timing and combining received packets with packets in a corresponding hybrid automatic repeat request (HARQ) process buffer used in the first TDD configuration, wherein the uplink is configured for synchronous HARQ.

7 . A method according to claim 6 , comprising retransmitting only normal subframes, if uplink HARQ processes in the first TDD configuration are mapped to the same uplink subframe.

8 . A method according to claim 6 , comprising retransmitting packets in one boundary subframe for corresponding packets in multiple boundary subframes in the first TDD configuration.

9 . An apparatus for wireless communication, the apparatus comprising at least one processor and a memory storing computer instructions, wherein the processor and the memory with the computer instructions are configured to cause the apparatus, after receiving at least one failed packet in a first time division duplex (TDD) configuration and information to change from the first TDD configuration to a second TDD configuration, to at least:

send a repeat request for said at least one failed packet; and

receive a retransmission of the failed packets of the first TDD configuration in the second TDD configuration.

10 . An apparatus according to claim 9 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to flush a hybrid automatic repeat request (HARQ) buffer after receiving information to change from the first TDD configuration to the second TDD configuration and to receive the retransmission of the failed packets of the first TDD configuration in the second TDD configuration as new packets.

11 . An apparatus according to claim 10 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to use a specified number of HARQ processors and downlink association set index in the second TDD configuration, wherein the downlink is configured for asynchronous HARQ.

12 . An apparatus according to claim 10 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to use a specified number of HARQ processors and implicit timing between physical uplink shared channel (PUSCH) and physical HARQ indicator channel/physical downlink control channel (PHICH/PDCCH) in the second TDD configuration, wherein the uplink is configured for synchronous HARQ.

13 . An apparatus according to claim 9 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to:

detect packets to be retransmitted from the downlink process index comprising packets from the first TDD configuration and a new data indicator (NDI) value, and

combine received packets with packets in a corresponding hybrid automatic repeat request (HARQ) process buffer used in the first TDD configuration,

wherein the downlink is configured for asynchronous HARQ.

14 . An apparatus according to claim 9 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to:

map a first uplink subframe in the second TDD configuration after a downlink feedback timing,

add a predetermined time period to the feedback timing; and

combine received packets with packets in a corresponding hybrid automatic repeat request (HARQ) process buffer used in the first TDD configuration, wherein the uplink is configured for synchronous HARQ.

15 . An apparatus according to claim 14 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to retransmit only normal subframes, if uplink HARQ processes in the first TDD configuration are mapped to the same uplink subframe.

16 . An apparatus according to claim 14 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to retransmit packets in one boundary subframe for corresponding packets in multiple boundary subframes in the first TDD configuration.

17 . A network element for wireless communication, the apparatus comprising at least one processor and a memory storing computer instructions, wherein the processor and the memory with the computer instructions are configured to cause the apparatus, after receiving at least one failed packet in a first time division duplex (TDD) configuration and information to change from the first TDD configuration to a second TDD configuration, to at least:

send a repeat request for said at least one failed packet; and

receive a retransmission of the failed packets of the first TDD configuration in the second TDD configuration.

18 . A network element according to claim 17 , wherein the processor and the memory with the computer instructions arc further configured to cause the apparatus to flush a hybrid automatic repeat request (HARQ) buffer after receiving information to change from the first TDD configuration to the second TDD configuration and to receive the retransmission of the failed packets of the first TDD configuration in the second TDD configuration as new packets.

19 . A network element according to claim 18 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to use a specified number of HARQ processors and downlink association set index in the TDD configuration from uplink to downlink, wherein the downlink is configured for asynchronous HARQ.

20 . A network element according to claim 17 , wherein the processor and the memory with the computer instructions are further configured to cause the apparatus to use a specified number of hybrid automatic repeat request (HARQ) processors and implicit timing between physical uplink shared channel (PUSCH) and physical HARQ indicator channel/physical downlink control channel (PHICH/PDCCH) in the second TDD configuration, wherein the uplink is configured for synchronous HARQ.

21 - 22 . (canceled)