US 12,245,282 B2
Early transmission of mobile-terminated data
Dung Pham Van, Upplands Väsby (SE); Andreas Höglund, Solna (SE); Magnus Stattin, Upplands Väsby (SE); Tuomas Tirronen, Helsinki (FI); and Emre Yavuz, Stockholm (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/427,307
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jan. 31, 2020, PCT No. PCT/IB2020/050807
§ 371(c)(1), (2) Date Jul. 30, 2021,
PCT Pub. No. WO2020/157725, PCT Pub. Date Aug. 6, 2020.
Claims priority of provisional application 62/798,831, filed on Jan. 30, 2019.
Prior Publication US 2022/0256606 A1, Aug. 11, 2022
Int. Cl. H04W 74/0833 (2024.01); H04L 1/08 (2006.01); H04L 5/00 (2006.01); H04W 68/00 (2009.01); H04W 74/04 (2009.01)
CPC H04W 74/0833 (2013.01) [H04L 1/08 (2013.01); H04L 5/0053 (2013.01); H04W 68/005 (2013.01); H04W 74/04 (2013.01)] 16 Claims
OG exemplary drawing
 
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.