US 12,445,942 B2
Random access method and apparatus, and storage medium
Qin Mu, Beijing (CN)
Assigned to BEIJING XIAOMI MOBILE SOFTWARE CO., LTD., Beijing (CN)
Appl. No. 17/636,007
Filed by BEIJING XIAOMI MOBILE SOFTWARE CO., LTD., Beijing (CN)
PCT Filed Aug. 16, 2019, PCT No. PCT/CN2019/101181
§ 371(c)(1), (2) Date Feb. 16, 2022,
PCT Pub. No. WO2021/031008, PCT Pub. Date Feb. 25, 2021.
Prior Publication US 2022/0279588 A1, Sep. 1, 2022
Int. Cl. H04W 48/16 (2009.01); H04W 74/00 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 48/16 (2013.01) [H04W 74/002 (2013.01); H04W 74/004 (2013.01); H04W 74/0833 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A random access method, comprising:
transmitting, by a terminal, a message 3 on a random access resource in a case where the terminal performs random access to re-access a network due to change in link quality, wherein the terminal is in a grant-free scheduling state, the terminal in the grant-free scheduling state is in a non-connected state and receives a cell radio network temporary identity (C-RNTI) preconfigured by a network device, and in response to determining that the terminal has data to be transmitted, the data is transmitted by the terminal on a resource preconfigured by the network device for the terminal at a designated transmission occasion;
reporting, by the terminal, a user identity in the message 3, wherein the user identity comprises an international mobile subscriber identity (IMSI) or the preconfigured C-RNTI;
determining, by the terminal, whether a target cell to be accessed is an original serving cell or not;
in response to determining that the target cell to be accessed is the original serving cell, the user identity comprises the preconfigured C-RNTI;
in response to determining that the target cell to be accessed is not the original serving cell, the user identity comprises the IMSI;
obtaining a message 4, wherein the message 4 is included in a physical downlink shared channel (PDSCH) scheduled by a second physical downlink control channel (PDCCH), wherein in response to determining that the target cell to be accessed is the original serving cell, the second PDCCH is scrambled by the preconfigured C-RNTI, and in response to determining that the target cell to be accessed is not the original serving cell, the second PDCCH is scrambled by a temporarily allocated C-RNTI; and
reporting grant-free scheduling state information, wherein the grant-free scheduling state information indicates that the terminal is in the grant-free scheduling state.