Zhijun Cai

Bio: Zhijun Cai is an academic researcher from BlackBerry Limited. The author has contributed to research in topics: User equipment & Polling. The author has an hindex of 1, co-authored 3 publications receiving 26 citations.

Polling method and apparatus for long term evolution multimedia broadcast multicast services

Abstract: A device for wirelessly communicating a service to user equipment is provided. The device includes a transmitter, a receiver, and a processor. The processor is programmed to promote the transmitter polling to determine whether user equipment desire a service and responsive to receiving, via the receiver, at least one user equipment request for the service, the processor programmed to promote the transmitter providing a point-to-multipoint (PTM) broadcast of the service.

Polling method and apparatus for long term evolution (LTE) multimedia broadcast multicast services

Abstract: A device (204) for wirelessly communicating a service to user equipment (206) is provided. The device (204) includes a transmitter and receiver (392), and a processor (382). The processor (382) is programmed to promote the transmitter (392) polling to determine whether user equipment 206 desire a service and responsive to receiving, via the receiver (392), at least one user equipment (206) request for the service, the processor (382) programmed to promote the transmitter (392) providing a point-to-multipoint (PTM) broadcast of the service.

Method for detecting security error in mobile telecommunications system and device of mobile telecommunications

Abstract: According to one embodiment, a method of performing a re-establishment procedure in a mobile communication system includes: receiving at least one packet data convergence protocol (PDCP) control plane data unit; performing an integrity check on the at least one PDCP control plane data unit; identifying an integrity check failure with regard to the at least one PDCP control plane data unit; and performing a re-establishment procedure if the integrity check failure is identified to exist with regard to the at least one PDCP control plane data unit.

method of allocating radio resouces in a wireless communication system

Abstract: A method of allocating radio resources in a wireless communication system is disclosed. In one aspect of the present invention, in a wireless communication system, a user equipment requests a base station to allocate radio resources for uplink data transmission of at least one time in accordance with a first radio resource allocation request mode. The user equipment requests the base station to allocate the radio resources for uplink data transmission in accordance with a second radio resource allocation request mode if a predetermined condition is satisfied.

Method for re-attempting a random access effectively

Abstract: Disclosed is a radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, to a method for re-attempting a rapid random access when a problem occurs in the random access procedure in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from the Universal Mobile Telecommunications System (UMTS) or a Long Term Evolution (LTE) system.

Method of transmitting and receiving control information in a wireless communication system

Abstract: A method of transmitting and receiving control information in a wireless communication system is disclosed. The method of receiving control information related to a specific point-to-multipoint service in a user equipment of a wireless communication system comprises receiving a notification message including indication information and an identifier identifying the point-to-multipoint service from a network, the indication information indicating at least one downlink channel related to the specific point-to-multipoint service among a plurality of downlink channels established for transmission of control information for at least one or more point-to-multipoint service, and receiving at least one downlink channel indicated by the indication information.

A random access method for multimedia broadcast multicast service(mbms)

Abstract: A method of performing random access procedure in a wireless communication system is disclosed. The present invention includes the steps of receiving a first message transmitted to count the number of user equipments attempting to receive the broadcast/multicast service from a network, transmitting a preamble for a random access to the network, receiving a second message including a user equipment identifier for identifying the user equipment and uplink (UL) radio resource allocation information in response to the preamble from the network, transmitting a third message to the network using the uplink radio resource allocation information, and stopping the random access in case of receiving a contention resolution message from the network.