	US 12,413,966 B2
	Method, device, and system for physical channel encryption in wireless networks
Bo Dai, Shenzhen (CN); Jin Xu, Shenzhen (CN); Guanghui Yu, Shenzhen (CN); Feng Xie, Shenzhen (CN); and Liujun Hu, Shenzhen (CN)
Assigned to ZTE CORPORATION, Shenzhen (CN)
Filed by ZTE Corporation, Shenzhen (CN)
Filed on Oct. 16, 2023, as Appl. No. 18/487,436.
Application 18/487,436 is a continuation of application No. PCT/CN2021/093809, filed on May 14, 2021.
Prior Publication US 2024/0137758 A1, Apr. 25, 2024
Int. Cl. H04W 12/0431 (2021.01); H04W 12/037 (2021.01)

CPC H04W 12/0431 (2021.01) [H04W 12/037 (2021.01)]

14 Claims

1. A method for physical channel encryption in a wireless communication network, performed by a user equipment (UE), the method comprising:

obtaining a first key for decrypting a first physical channel, wherein the first physical channel being is encrypted in a time domain symbol level using following steps:

generating an initial value c_initbased on the first key using one of following formulas:

c_init=n_PHID·2^L1+L2+SlotIndex·2^L1+n_ID;

c_init=n_PHID·2^L1+L2+1+q·2^L1+L2+SlotIndex·2^L1+n_ID;

c_init=n_PHID·2^L1+1+q·2^L1+n_ID;

c_init=SlotIndex·2^w+n_PHID;

c_init=SFNIndex·2^w+L2+Slot Index·2^w+n_PHID; or

c_init=n_PHID;

wherein:

n_PHIDis the first key, w is a length of the first key;

SlotIndex is a slot index;

SFNIndex is a system frame index;

n_IDis a cell ID of a cell associated with the physical channel, or a multicast ID, or an ID configured by the network, a range of n_IDbeing from 0 to 2^L1−1;

L1 is a bit length of n_IDrepresented in binary format;

L2 is a bit length of the slot index represent in binary format;

generating a pseudo random sequence based on the initial value c_init;

performing a phase rotation on a time domain symbol associated with the first physical channel according to the pseudo random sequence; and

decrypting the first physical channel based on the first key to obtain a signal or data transmitted by a first network element, the signal or the data being carried in the first physical channel.