Abstract: Embodiments of this application provide a communication method, an apparatus, and a system. The method includes: A proxy base station receives a MSG1 from a user equipment. The proxy base station sends a MSG2 to the user equipment in response to the MSG1, where the MSG2 includes a timing advance, and the timing advance is determined based on at least one of an internal processing delay of a signal extension system and a delay between the signal extension system and a signal source base station.

Abstract: Embodiments disclose a remote radio unit hub (RHUB), an indoor communications system, and a signal transmission method. The RHUB includes an input port module, a first output port module, and a processing module. The input port module is configured to connect to a baseband unit (BBU) in a wired manner and receive a first communications signal sent by the BBU. The first output port module is configured to connect to another RHUB in a wired manner. Additionally, the processing module is configured to send, according to the first communications signal received by the input port module, a second communications signal to the another RHUB by using the first output port module.

Abstract: Embodiments disclose a remote radio unit hub (RHUB), an indoor communications system, and a signal transmission method. The RHUB includes an input port module, a first output port module, and a processing module. The input port module is configured to connect to a baseband unit (BBU) in a wired manner and receive a first communications signal sent by the BBU. The first output port module is configured to connect to another RHUB in a wired manner. Additionally, the processing module is configured to send, according to the first communications signal received by the input port module, a second communications signal to the another RHUB by using the first output port module.

Abstract: Embodiments of the present invention provide a handover method and apparatus in an access point network. The method includes: determining, by a source access point, that a handover is needed; obtaining, by the source access point, IP address information of a target access point; setting up, by the source access point, an Iur link with the target access point according to the IP address information; instructing, by the source access point, the target access point to set up a radio link between the target access point and a user equipment; and deleting, by the source access point, a radio link between the source access point and the user equipment.

Abstract: A method for transmitting a transcoder & rate adaptation unit (TRAU) frame over a packet network according to one embodiment of the present invention includes: receiving a packet TRAU (P_TRAU) frame sent from an opposite device; parsing the P_TRAU frame to obtain control information required for packet network transmission; and processing data in the P_TRAU frame according to the control information. A system and device for transmitting a TRAU frame over a packet network are also provided. With the P_TRAU frame that carries the control information required for packet network transmission, the Abis interface may use the packet mode instead of the time division multiplex (TDM) mode for transmission bearer and the delay, jitter, packet loss, and disorder in the packet mode are solved.

Abstract: A method for transmitting a transcoder & rate adaptation unit (TRAU) frame over a packet network according to one embodiment of the present invention includes: receiving a packet TRAU (P_TRAU) frame sent from an opposite device; parsing the P_TRAU frame to obtain control information required for packet network transmission; and processing data in the P_TRAU frame according to the control information. A system and device for transmitting a TRAU frame over a packet network are also provided.