The present disclosure relates to a communication technique that fuses IoT technology with a 5G communication system to support a higher data transfer rate than a 4G communication system, and a system therefor. The present disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retailing, security and safety related services, etc.) on the basis of 5G communication technology and IoT related technology. The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. An embodiment of the present invention relates to a method and a structure for processing data for packet duplication. According to the embodiment of the present invention, disclosed are a radio bearer setup method, a packet duplication operation, and a buffer status reporting method, which are for use in performing packet duplication.

The present disclosure relates to a communication technique that fuses IoT technology with a 5G communication system to support a higher data transfer rate than a 4G communication system, and a system therefor. The present disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retailing, security and safety related services, etc.) on the basis of 5G communication technology and IoT related technology. The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. An embodiment of the present invention relates to a method and a structure for processing data for packet duplication. According to the embodiment of the present invention, disclosed are a radio bearer setup method, a packet duplication operation, and a buffer status reporting method, which are for use in performing packet duplication.

Methods, systems, and devices related to mobility management (e.g., reducing transmission delay and interference, and/or increasing transmission reliability) using the unlicensed spectrum are described. In one representative aspect, a method for wireless communication includes receiving, at a wireless communication node, a first message from a mobile device requesting a reestablishment of a network connection; transmitting, from the wireless communication node, a second message to the mobile device, the second message including information for reestablishing and reconfiguring the network connection; and receiving, at the wireless communication node, a third message from the mobile device acknowledging at least one of (1) completing a reestablishment of the network connection, or (2) completing a reconfiguration of the network connection.

Methods, systems, and devices related to mobility management (e.g., reducing transmission delay and interference, and/or increasing transmission reliability) using the unlicensed spectrum are described. In one representative aspect, a method for wireless communication includes receiving, at a wireless communication node, a first message from a mobile device requesting a reestablishment of a network connection; transmitting, from the wireless communication node, a second message to the mobile device, the second message including information for reestablishing and reconfiguring the network connection; and receiving, at the wireless communication node, a third message from the mobile device acknowledging at least one of (1) completing a reestablishment of the network connection, or (2) completing a reconfiguration of the network connection.

There is provided mechanisms for configuring use of keys for security protecting packets communicated between a wireless device and a network node. A method is performed by the wireless device. The method comprises exchanging key use information with the network node in conjunction with performing a key change procedure with the network node during which a first key is replaced with a second key. The key use information indicates which of the packets are security protected using which of the first key and the second key.

There is provided mechanisms for configuring use of keys for security protecting packets communicated between a wireless device and a network node. A method is performed by the wireless device. The method comprises exchanging key use information with the network node in conjunction with performing a key change procedure with the network node during which a first key is replaced with a second key. The key use information indicates which of the packets are security protected using which of the first key and the second key.

The present disclosure provides a method and device used in a communication node for wireless communications. A communication node determines that first data is transmitted in a first state, selects a first step-size, and transmits a first signal according to first target power; updates a first counter; when the first counter is not greater than a first threshold, and determines that a second counter is updated, transmits a third signal according to second target power; monitors a second signal in a first time window; the first state comprises RRC_INACTIVE State; the first data comprises a small data packet; the first signal, the second signal and the third signal are used for random access procedure; the first counter is used to count a number of transmission(s) of a preamble sequence; the second counter is used to count a number of time(s) the first step-size is increased.

Provided are an information transmission method, a network device and a terminal device. The method comprises: a first network device obtains indication information, the indication information being used for indicating integrity protection (IP) check failure of data on a data radio bearer (DRB); the first network device sends the indication information to a second network device. In embodiments of the present application, by means of the indication information, the second network device can update a secret key of the terminal device during the IP check failure of data on the DRB, or the second network device can release RRC connection of the DRB. In this way, the potential safety hazard is eliminated, the communication security is ensured, and therefore, the success rate of data transmission is improved.

Provided are an information transmission method, a network device and a terminal device. The method comprises: a first network device obtains indication information, the indication information being used for indicating integrity protection (IP) check failure of data on a data radio bearer (DRB); the first network device sends the indication information to a second network device. In embodiments of the present application, by means of the indication information, the second network device can update a secret key of the terminal device during the IP check failure of data on the DRB, or the second network device can release RRC connection of the DRB. In this way, the potential safety hazard is eliminated, the communication security is ensured, and therefore, the success rate of data transmission is improved.

An apparatus and a method capable of effectively providing services in a mobile communication system, and a data processing method of a data reception apparatus are provided. The apparatus and method includes obtaining, by a first lower packet data convergence protocol (PDCP) layer and a second lower PDCP layer, a plurality of PDCP packet data units (PDUs) based on data received from a first base station (BS) and a second BS, parallel deciphering, by the first and second lower PDCP layers, the plurality of PDCP PDUs, transmitting, from the first and second lower PDCP layers to an upper PDCP layer, the plurality of deciphered PDCP PDUs, and reordering, by the upper PDCP layer, the plurality of deciphered PDCP PDUs.