Method for communication and an apparatus thereof

1. A method, comprising:

receiving, by a user equipment (UE), first downlink control information (DCI) in a format 1_0 and in a UE specific search space with cyclic redundancy check (CRC) scrambled by a UE identifier (UE ID) of the UE, the first DCI scheduling communication of a first physical downlink shared channel (PDSCH) for the UE;

in response to the first DCI being in the format 1_0 and in the UE specific search space, generating, by the UE, a first sequence by initializing, by the UE, the first sequence with a configurable parameter received by the UE, and descrambling, by the UE, the first PDSCH using the first sequence;

receiving, by the UE, second DCI in a common search space with CRC scrambled by the UE ID of the UE, the second DCI scheduling communication of a second PDSCH for the UE; and

in response to the second DCI being in the common search space, generating, by the UE, a second sequence by initializing, by the UE, the second sequence with a cell ID, and descrambling, by the UE, the second PDSCH using the second sequence.

2. The method of claim 1 , further comprising:

receiving, by the UE, the configurable parameter from a base station (BS).

3. The method of claim 1 ,

wherein the second DCI is in the format 1_0.

4. The method of claim 1 , wherein initializing the first sequence with the configurable parameter comprises:

generating, by the UE, an initialized sequence that is determined based on the configurable parameter.

5. The method of claim 1 , wherein

the UE receives the first DCI by detecting a DCI in the format 1_0 in the UE specific search space with CRC scrambled by the UE ID of the UE.

6. The method of claim 1 , wherein the UE ID comprises a cell-radio network temporary identifier (C-RNTI), a modulation and coding scheme-C-RNTI (MCS-C-RNTI) or a configured scheduling-RNTI (CS-RNTI).

7. The method of claim 1 , wherein initializing the first sequence with the configurable parameter comprises:

obtaining, by the UE, the first sequence using an initialized sequence that is determined, by the UE, based on the configurable parameter represented by n ID , wherein n ID ∈{0, 1, . . . , 1023} is configured by higher-layer signaling.

8. The method of claim 7 , wherein the initialized sequence is determined based on the configurable parameter represented by n ID , and wherein the initialized sequence satisfies c init =n RNTI ·2 15 +q·2 14 +n ID , c init is the initialized sequence, and n RNTI corresponds to a RNTI associated with a physical downlink shared channel (PDSCH) transmission.

9. The method of claim 1 , wherein receiving the first DCI comprises detecting the first DCI after a radio resource control (RRC) configuration procedure is performed.

10. The method of claim 1 , further comprising:

receiving, by the UE, the first PDSCH scheduled by the first DCI.

11. An apparatus, comprising:

one or more processors, configured to couple with a non-transitory memory storage, wherein the non-transitory memory storage is configured to store instructions, which when executed, cause the apparatus to:

receive first downlink control information (DCI) in a format 1_0 and in a UE specific search space with cyclic redundancy check (CRC) scrambled by a UE identifier (UE ID) of the apparatus or a user equipment (UE) which the apparatus is used for, the first DCI scheduling communication of a first physical downlink shared channel (PDSCH) for the apparatus or the UE which the apparatus is used for;

in response to the first DCI being in the format 1_0 and in the UE specific search space, generate a first sequence by initializing the first sequence with a configurable parameter received by the apparatus, and descramble the first PDSCH using the first sequence;

receive second DCI in a common search space with CRC scrambled by the UE ID, the second DCI scheduling communication of a second PDSCH for the apparatus or the UE which the apparatus is used for; and

in response to the second DCI being in the common search space, generate a second sequence by initializing the second sequence with a cell ID, and descramble the second PDSCH using the second sequence.

12. The apparatus of claim 11 , wherein the one or more processors execute the instructions to cause the apparatus further to:

receive the configurable parameter from a base station (BS).

13. The apparatus of claim 11 , wherein the second DCI is in the format 1_0.

14. The apparatus of claim 11 , wherein initializing the first sequence with the configurable parameter comprises:

generating an initialized sequence based on the configurable parameter, and generate the first sequence based on the initialized sequence.

15. The apparatus of claim 11 , wherein

the apparatus receives the first DCI by detecting a DCI in the format 1_0 in the UE specific search space with CRC scrambled by the UE ID of the UE.

16. The apparatus of claim 11 , wherein the UE ID comprises a cell-radio network temporary identifier (C-RNTI), a modulation and coding scheme-C-RNTI (MCS-C-RNTI) or a configured scheduling-RNTI (CS-RNTI).

17. The apparatus of claim 11 , wherein initializing the first sequence with the configurable parameter comprises:

obtaining the first sequence using an initialized sequence that is determined based on the configurable parameter represented by n ID , and wherein n ID ∈{0, 1, . . . , 1023} is configured by higher-layer signaling.

18. The apparatus of claim 17 , wherein the initialized sequence is determined based on the configurable parameter represented by nm, wherein the initialized sequence satisfies c init =n RNTI ·2 15 +q·2 14 +n ID , c init represents the initialized sequence, and n RNTI corresponds to a RNTI associated with a physical downlink shared channel (PDSCH) transmission.

19. The apparatus of claim 11 , wherein receiving the first DCI comprises detecting the first DCI after a radio resource control (RRC) configuration procedure is performed.

20. The apparatus of claim 11 , wherein the instructions cause the apparatus to further receive the first PDSCH scheduled by the first DCI.

21. A non-transitory computer-readable media storing computer instructions, that when executed by one or more processors, cause the one or more processors to perform the steps of:

receiving first downlink control information (DCI) in a format 1_0 and in a UE specific search space with cyclic redundancy check (CRC) scrambled by a UE identifier (UE ID) of a user equipment (UE) which the non-transitory computer-readable media is used for, the first DCI scheduling communication of a first physical downlink shared channel (PDSCH) for the UE;

in response to the first DCI being in the format 1_0 and in the UE specific search space, generating a first sequence by initializing the first sequence with a configurable parameter received by the UE, and descrambling the first PDSCH using the first sequence;

receiving second DCI in a common search space with CRC scrambled by the UE ID of the UE, the second DCI scheduling communication of a second PDSCH for the UE; and

in response to the second DCI being in the common search space, generating a second sequence by initializing the second sequence with a cell ID, and descrambling the second PDSCH using the second sequence.

22. The non-transitory computer-readable media of claim 21 , wherein the computer instructions cause the one or more processors to further perform:

receiving the configurable parameter from a base station (BS).

23. The non-transitory computer-readable media of claim 21 , wherein the second DCI is in the format 1_0.

24. The non-transitory computer-readable media of claim 21 , wherein initializing the first sequence with the configurable parameter comprises:

generating an initialized sequence that is determined based on the configurable parameter.

25. The non-transitory computer-readable media of claim 21 , wherein the computer instructions cause the one or more processors to further perform:

receiving the first DCI by detecting a DCI in the format 1_0 in the UE specific search space with CRC scrambled by the UE ID of the UE.

26. The non-transitory computer-readable media of claim 21 , wherein the UE ID comprises a cell-radio network temporary identifier (C-RNTI), a modulation and coding scheme-C-RNTI (MCS-C-RNTI) or a configured scheduling-RNTI (CS-RNTI).

27. The non-transitory computer-readable media of claim 21 , wherein initializing the first sequence with the configurable parameter comprises:

obtaining the first sequence using an initialized sequence that is determined based on the configurable parameter represented by n ID , wherein n ID ∈{0, 1, . . . , 1023} is configured by higher-layer signaling.

28. The non-transitory computer-readable media of claim 27 , wherein the initialized sequence is determined based on the configurable parameter represented by n ID , wherein the initialized sequence satisfies c init =n RNTI ·2 15 +q·2 14 +n ID , c init is the initialized sequence, and n RNTI corresponds to a RNTI associated with a physical downlink shared channel (PDSCH) transmission.

29. A system comprising:

a base station; and

a user equipment (UE), configured to communicate with the base station, wherein the UE includes one or more processors, configured to couple with a non-transitory memory storage, and wherein the non-transitory memory storage is configured to store instructions, which when executed, cause the one or more processors to:

receive, from the base station, first downlink control information (DCI) in a format 1_0 and in a UE specific search space with cyclic redundancy check (CRC) scrambled by a UE identifier (UE ID) of the UE, the first DCI scheduling communication of a first physical downlink shared channel (PDSCH) for the UE;

in response to the first DCI being in the format 1_0 and in the UE specific search space, generate a first sequence by initializing the first sequence with a configurable parameter received by the UE, and descramble the first PDSCH using the first sequence;

receive, from the base station, second DCI in a common search space with CRC scrambled by the UE ID of the UE, the second DCI scheduling communication of a second PDSCH for the UE; and

in response to the second DCI being in the common search space, generate a second sequence by initializing the second sequence with a cell ID, and descramble the second PDSCH using the second sequence.

30. The system of claim 29 , wherein the one or more processors execute the instructions to further:

receive the configurable parameter from the base station.