Granted Patent B2

US 12,245,282 · App. 17/427,307 · Granted Mar 4, 2025

Inventors: Dung Pham Van (Upplands Väsby, SE); Andreas Höglund (Solna, SE); Magnus Stattin (Upplands Väsby, SE); Tuomas Tirronen (Helsinki, FI); Emre Yavuz (Stockholm, SE)

Assignee: Telefonaktiebolaget LM Ericsson (publ)

H04W74/0833H04L1/08H04L5/0053H04W68/005H04W74/04

Abstract

Claims (76)

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, 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; or

a device-specific identity that is specific to the wireless device; or

a paging radio network temporary identifier (RNTI) specific to MT-EDT; 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, wherein the downlink message is received in accordance with scheduling information in a random access response message of the random access procedure;

positively or negatively acknowledging the MT-EDT;

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; and

using the security material or security context to decrypt a secret identifier included in the downlink message, wherein said descrambling or decrypting is performed using a key identified by the secret identifier.

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

a paging message; or

a random access response message of the random access procedure.

3. The method of claim 1 , wherein the one or more parameters include:

a radio network temporary identifier (RNTI); or

the contention-free random access preamble; or

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

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.

4. The method of claim 1 , 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.

5. The method of claim 1 , 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.

6. The method of claim 1 , 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.

7. The method of claim 1 , 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; or

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; or

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.

8. 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, 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; 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, wherein the downlink message is received in accordance with scheduling information in a random access response message of the random access procedure;

positively or negatively acknowledging the MT-EDT;

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; and

using the security material or security context to decrypt a secret identifier included in the downlink message, wherein said descrambling or decrypting is performed using a key identified by the secret identifier.

9. The wireless device of claim 8 , wherein the downlink message is:

a paging message; or

a random access response message of the random access procedure.

10. The wireless device of claim 8 , 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.

11. The wireless device of claim 8 , wherein the one or more parameters include:

a radio network temporary identifier (RNTI); or

the contention-free random access preamble; or

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

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.

12. The wireless device of claim 8 , 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.

13. The wireless device of claim 8 , 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.

14. The wireless device of claim 8 , 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.

15. The wireless device of claim 8 , 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; or

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; or

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 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, wherein said downlink message is descrambled or decrypted after receiving at the wireless device 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;

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, wherein the downlink message is received in accordance with scheduling information in a random access response message of the random access procedure;

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

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; and

using the security material or security context to decrypt a secret identifier included in the downlink message, wherein said descrambling or decrypting is performed using a key identified by the secret identifier.

Assignments (4)

Continuity (2)

References Cited (33)