Method, system, and terminal device for data transmission in unlicensed spectrum

#The present disclosure relates to the wireless communications field, and in particular, to a method, system, and terminal device for data transmission in an unlicensed spectrum.

#Wireless communication between communications devices is implemented by using a spectrum. Spectrums may be roughly classified into two types. One type is a licensed spectrum, and the other type is an unlicensed spectrum.

#A plurality of systems share an unlicensed band. Therefore, for use of an unlicensed spectrum, to avoid mutual signal interference between the plurality of systems, a communications device can perform communication by using an unlicensed spectrum only after determining that the unlicensed spectrum is idle. A process in which the communications device detects whether the unlicensed spectrum is occupied is referred to as a listen before talk (LBT) process.

#FIG. 1 is a schematic diagram of an unlicensed spectrum application scenario according to an embodiment of the present disclosure;

#FIG. 2 is a schematic flowchart of a method for data transmission in an unlicensed spectrum according to an embodiment of the present disclosure;

#FIG. 3 is a schematic diagram of an air-interface configuration of a radio frame in an unlicensed spectrum according to an embodiment of the present disclosure;

#The following clearly describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some but not all of the embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

#The embodiments of the present disclosure provide a method, system, and terminal device for data transmission in an unlicensed spectrum. A mixed transmission method based on contention and scheduling is used, to implement data transmission between a terminal device and a network device in an unlicensed spectrum. In the technical solutions, the terminal device properly selects a data packet transmission mode with reference to a user attribute and a data packet attribute, or the terminal device properly selects a data packet transmission mode with reference to a user attribute, so as to more flexibly use an unlicensed spectrum. A terminal device of an edge user chooses to transmit a data packet to the network device in a contention manner or a duty cycle manner, so as to effectively reduce mutual interference between different systems while meeting regulation constraints on use of the unlicensed spectrum. The method, system, and terminal device are based on a same inventive concept. The method, system, and terminal device have similar principles for resolving the problems. Therefore, for implementation of the system, terminal device, and method, reference may be made to each other, and details of repeated parts are not described.

#The terminal device in the embodiments of the present disclosure may be a device that provides a user with voice and/or data connectivity, a handheld device with a wireless connection function, or another processing device connected to a wireless modem. A wireless terminal device may communicate with one or more core networks by using a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or referred to as a “cellular” phone) and a computer with a mobile terminal device, for example, may be a portable, pocket-sized, handheld, computer built-in, or in-vehicle mobile apparatus, which exchanges voice and/or data with the radio access network. For example, the wireless terminal device may be a device such as a personal communications service (PCS) phone, a cordless telephone set, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, or a personal digital assistant (PDA). The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, user device, or user equipment.