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1. WO2020157725 - TRANSMISSION PRÉCOCE DE DONNÉES À TERMINAISON MOBILE

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CLAIMS

What is claimed is:

1. A method performed by a wireless device, the method comprising:

receiving a downlink message from a network node;

descrambling or decrypting the downlink message, or one or more fields of the downlink message, to obtain one or more parameters; and

using the one or more parameters to perform at least one action from any one or more of the following actions:

receiving a mobile-terminated, MT, early data transmission, EDT, during a contention- free random access procedure;

positively or negatively acknowledging the MT-EDT; and

receiving a re-transmission of the MT-EDT;

wherein the contention-free random access procedure includes the wireless device

transmitting a contention-free random access preamble to the network node and receiving a random access response from the network node, and wherein the MT- EDT is received when or before the wireless device receives the random access response.

2. The method of claim 1 , wherein the downlink message is a paging message.

3. The method of claim 1, wherein the downlink message is, or is received in accordance with scheduling information in, a random access response message of the random access procedure.

4. The method of any of claims 1-3, wherein said descrambling or decrypting is performed based on:

security material, or a security context, shared between the wireless device and the

network node; or

a predefined descrambling or decrypting function shared between the wireless device and the network node.

5. The method of claim 4, further comprising using the security material or security context to decrypt a secret identifier included in the downlink message, and wherein said descrambling or decrypting is performed using a key identified by the secret identifier.

6. The method of any of claims 1-5, wherein said descrambling or decrypting is performed based on a device-specific identity that is specific to the wireless device or based on a paging radio network temporary identifier, RNTI, specific to MT-EDT.

7. The method of any of claims 1-6, wherein the one or more parameters include a radio network temporary identifier, RNTI.

8. The method of any of claims 1-7, wherein the one or more parameters include:

the contention-free random access preamble; or

an identifier of, or index of, the contention-free random access preamble.

9. The method of any of claims 1-8, wherein the one or more parameters include a parameter that indicates radio resources on which the MT-EDT is to be received, a parameter that indicates radio resources on which the wireless device is to transmit a positive or negative acknowledgement of the MT-EDT, and/or a parameter that indicates radio resources on which to receive the re-transmission of the MT-EDT.

10. The method of any of claims 1-9, wherein said using comprises using at least one of the one or more parameters to receive the MT-EDT, wherein using at least one of the one or more parameters to receive the MT-EDT comprises using at least one of the one or more parameters to perform at least one action from any one or more of the following actions:

descrambling the MT-EDT;

descrambling scheduling information that schedules the MT-EDT; and

determining one or more radio resources on which to receive the MT-EDT.

11. The method of any of claims 1-10, wherein said using comprises using at least one of the one or more parameters to positively or negatively acknowledge the MT-EDT, wherein using at least one of the one or more parameters to positively or negatively acknowledge the MT-EDT comprises using at least one of the one or more parameters to perform a random access channel transmission during the contention-free random access procedure and on a random access channel, wherein the random access channel transmission positively or negatively acknowledge the MT-EDT.

12. The method of claim 11, wherein the downlink message is a paging message that indicates the contention-free random access preamble that the wireless device is to use for the random access channel transmission, and wherein the MT-EDT is received after or in conjunction with the paging message.

13. The method of any of claims 11-12, wherein using at least one of the one or more parameters to perform the random access channel transmission comprises using at least one of the one or more parameters to scramble the random access channel transmission or to scramble the contention-free random access preamble conveyed by the random access channel transmission.

14. The method of any of claims 11-13, wherein using at least one of the one or more parameters to perform the random access channel transmission comprises using at least one of the one or more parameters to select a contention-free random access preamble to be conveyed by the random access channel transmission.

15. The method of any of claims 1-14, wherein said using comprises using at least one of the one or more parameters to receive a re-transmission of the MT-EDT, wherein using at least one of the one or more parameters to receive a re-transmission of the MT-EDT comprises using at least one of the one or more parameters to monitor a downlink control channel for scheduling information that schedules the re-transmission of the MT-EDT.

16. A method performed by a network node, the method comprising:

scrambling or encrypting a downlink message, or one or more fields of the downlink message, indicating one or more parameters;

after said scrambling or encrypting, transmitting the downlink message from the network node to a wireless device; and

using the one or more parameters to perform at least one action from any one or more of the following actions:

transmitting a mobile-terminated, MT, early data transmission, EDT, from the network node to the wireless device during a contention-free random access procedure; receiving from the wireless device positive or negative acknowledgement of the MT- EDT; and

re-transmitting the MT-EDT to the wireless device;

wherein the contention-free random access procedure includes the network node

receiving a contention-free random access preamble from the wireless device and transmitting a random access response to the wireless device, and wherein the MT-EDT is transmitted when or before the network node transmits the random access response.

17. The method of claim 16, wherein the downlink message is a paging message.

18. The method of claim 16, wherein the downlink message is, or is transmitted in accordance with scheduling information in, a random access response message of the contention-free random access procedure.

19. The method of any of claims 16-18, wherein said scrambling or encrypting is performed based on:

security material, or a security context, shared between the wireless device and the

network node; or

a predefined scrambling or encrypting function shared between the wireless device and the network node.

20. The method of claim 19, further comprising using the security material or security context to encrypt a secret identifier included in the downlink message, and wherein said scrambling or encrypting is performed using a key identified by the secret identifier.

21. The method of any of claims 16-20, wherein said scrambling or encrypting is performed based on a device-specific identity that is specific to the wireless device or based on a paging radio network temporary identifier, RNTI, specific to MT-EDT.

22. The method of any of claims 16-21, wherein the one or more parameters include a radio network temporary identifier, RNTI.

23. The method of any of claims 16-22, wherein the one or more parameters include:

the contention-free random access preamble; or

an identifier of, or index of, the contention-free random access preamble.

24. The method of any of claims 16-23, wherein the one or more parameters include at least one of any one or more of:

a parameter that indicates radio resources on which the MT-EDT is to be transmitted; a parameter that indicates radio resources on which the wireless device is to transmit a positive or negative acknowledgement of the MT-EDT; and

a parameter that indicates radio resources on which the wireless device is to receive the re-transmission of the MT-EDT.

25. The method of any of claims 16-24, wherein said using comprises using at least one of the one or more parameters to transmit the MT-EDT, wherein using at least one of the one or more parameters to transmit the MT-EDT comprises using at least one of the one or more parameters to perform at least one action from any one or more of the following actions:

scrambling the MT-EDT;

scrambling scheduling information that schedules the MT-EDT; and

determining one or more radio resources on which to transmit the MT-EDT.

26. The method of any of claims 16-25, wherein said using comprises using at least one of the one or more parameters to receive from the wireless device positive or negative

acknowledgement of the MT-EDT, wherein using at least one of the one or more parameters to receive from the wireless device positive or negative acknowledgement of the MT-EDT comprises using at least one of the one or more parameters to receive a random access channel transmission during the contention-free random access procedure and on a random access channel, wherein the random access channel transmission positively or negatively acknowledge the MT-EDT.

27. The method of claim 26, wherein the downlink message is a paging message that indicates a contention-free random access preamble that the wireless device is to use for the random access channel transmission, and wherein the MT-EDT is transmitted after or in conjunction with the paging message.

28. The method of any of claims 26-27, wherein using at least one of the one or more parameters to receive the random access channel transmission comprises using at least one of the one or more parameters to descramble the random access channel transmission or to descramble the contention-free random access preamble conveyed by the random access channel transmission.

29. The method of any of claims 16-28, wherein using at least one of the one or more parameters to receive the random access channel transmission comprises using at least one of the one or more parameters to select a contention-free random access preamble to be conveyed by the random access channel transmission.

30. The method of any of claims 16-29, wherein said using comprises using at least one of the one or more parameters to re-transmit the MT-EDT to the wireless device, wherein using at least one of the one or more parameters to re-transmit the MT-EDT comprises using at least one of the one or more parameters to transmit, on a downlink control channel, scheduling information that schedules a re-transmission of the MT-EDT.

1. A wireless device configured to:

receive a downlink message from a network node;

descramble or decrypt the downlink message, or one or more fields of the downlink message, to obtain one or more parameters; and

use the one or more parameters to perform at least one action from any one or more of the following actions:

receiving a mobile-terminated, MT, early data transmission, EDT, during a contention- free random access procedure;

positively or negatively acknowledging the MT-EDT; and

receiving a re-transmission of the MT-EDT;

wherein the contention-free random access procedure includes the wireless device

transmitting a contention-free random access preamble to the network node and receiving a random access response from the network node, and wherein the MT- EDT is received when or before the wireless device receives the random access response.

32. The wireless device of claim 31, configured to perform the method of any of claims 2-15.

33. A network node configured to:

scramble or encrypt a downlink message, or one or more fields of the downlink message, indicating one or more parameters;

after scrambling or encrypting of the downlink message or the one or more parameters, transmit the downlink message from the network node to a wireless device; and use the one or more parameters to perform at least one action from any one or more of the following actions:

transmitting a mobile-terminated, MT, early data transmission, EDT, from the network node to the wireless device during a contention-free random access procedure; receiving from the wireless device positive or negative acknowledgement of the MT- EDT; and

re-transmitting the MT-EDT to the wireless device;

wherein the contend on -free random access procedure includes the network node

receiving a contention-free random access preamble from the wireless device and transmitting a random access response to the wireless device, and wherein the

MT-EDT is transmitted when or before the network node transmits the random access response.

34. The network node of claim 33, configured to perform the method of any of claims 16-30.

35. A computer program comprising instructions which, when executed by at least one processor of a wireless device, causes the wireless device to perform the method of any of clai s 1-15.

36. A computer program comprising instructions which, when executed by at least one processor of a radio network node, causes the radio network node to perform the method of any of claims 16-30.

37. A carrier containing the computer program of any of claims 35-36, wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.

38. A wireless device comprising:

communication circuitry; and

processing circuitry configured to:

receive a downlink message from a network node;

descramble or decrypt the downlink message, or one or more fields of the

downlink message, to obtain one or more parameters; and

use the one or more parameters to perform at least one action from any one or more of the following actions:

receiving a mobile-terminated, MT, early data transmission, EDT, during a

contention-free random access procedure;

positively or negatively acknowledging the MT-EDT; and

receiving a re-transmission of the MT-EDT;

wherein the contention-free random access procedure includes the wireless device transmitting a contention-free random access preamble to the network node and receiving a random access response from the network node, and

wherein the MT-EDT is received when or before the wireless device receives the random access response.

39. The wireless device of claim 38, wherein the processing circuitry is configured to perform the method of any of claims 2-15.

40. A network node comprising:

communication circuitry; and

processing circuitry configured to:

scramble or encrypt a downlink message, or one or more fields of the downlink message, indicating one or more parameters;

after scrambling or encrypting of the downlink message or the one or more

parameters, transmit the downlink message from the network node to a wireless device; and

use the one or more parameters to perform at least one action from any one or more of the following actions:

transmitting a mobile-terminated, MT, early data transmission, EDT, from the network node to the wireless device during a contention-free random access procedure;

receiving from the wireless device positive or negative acknowledgement of the MT-EDT; and

re-transmitting the MT-EDT to the wireless device;

wherein the contention-free random access procedure includes the network node receiving a contention-free random access preamble from the wireless device and transmitting a random access response to the wireless device, and wherein the MT-EDT is transmitted when or before the network node transmits the random access response.

41. The network node of claim 40, configured to perform the method of any of claims 16-30.