A wireless communication network and method are described for enhancing cell-edge performance of a wireless transmit/receive unit (WTRU). The WTRU may establish a connection with a plurality of sites via respective downlinks (DLs). Each DL may include at least one DL component carrier (CC) that operates on a frequency that is the same or different than one or more of the other CCs. The sites may manipulate their transmit power for a particular CC operating frequency such that the distance from a particular one of the sites to its cell boundary may become larger by increasing its transmit power on the particular frequency, and the distance from at least one of the other sites to its respective cell boundary may become smaller by decreasing its transmit power on the particular frequency. Thus, a coverage overlap between different CC frequencies may be created while maintaining a frequency reuse pattern of one.

Method and apparatus for enhancing cell-edge user performance and signaling radio link failure conditions via downlink cooperative component carriers

While a clock generated by a built-in clock generator is used as a reference signal for determining a carrier frequency of a transmit signal, carrier frequency synchronization is achieved between base stations. A base station device is configured to perform wireless communication with a terminal device. In the base station device, accuracy of a carrier frequency of an OFDM signal is affected by accuracy of a clock frequency generated by a built-in clock generator 18. The base station device receives an OFDM signal transmitted from another base station device while transmission to the terminal device is stopped, estimates a carrier frequency offset of the OFDM signal, and corrects a carrier frequency of an OFDM signal to be transmitted to the terminal device.

Base station device

A system including a first preamble generator module configured to generate a first preamble for a first packet, which is a single-user packet. The first preamble includes a first short training field, a first long training field, a first signal field, and a second signal field. A second preamble generator module generates a second preamble for a second packet, which is a multi-user packet formatted as a multi-user packet or a single-user packet formatted as a multi-user packet. The second preamble is longer than the first preamble. The second preamble includes a second short training field, a second long training field, a third signal field, and a fourth signal field. A modulation module modulates at least one of the first signal field and the second signal field of the first preamble differently than at least one of the third signal field and the fourth signal field of the second preamble.

Preamble designs for sub-1GHz frequency bands

Method and arrangement in a base station for scheduling physical resources in a transmission bandwidth to a user equipment served by the base station. The physical resources may be physical channels or radio resource blocks. Some physical resources within the transmission bandwidth are subjected to a performance requirement power restriction value. The method comprises scheduling physical resources based on the performance requirement power restriction value of the physical resources to be scheduled. Also, a method and arrangement in a user equipment for assisting a base station in scheduling physical resources in a transmission bandwidth to the user equipment is described.

Method and arrangement in a wireless communication system

A multipath transport protocol such as multipath TCP can utilize metrics such as a wireless link condition corresponding to one or more paths as a parameter for controlling a dynamic allocation of data and control signaling over respective paths. Fault-tolerant control can enable retransmissions of packets already sent on a poor path, onto a good path. Further, the feedback, the retransmissions, and other control signaling can be provided on a separate subflow or on a UDP overlay. In this way, a multipath TCP connection can be more reliable and efficient as flow control and data flow are enhanced.

Dynamic subflow control for a multipath transport connection in a wireless communication network

Provided is a mobile communication system which eliminates a non-sensitive region and in which a mobile station can stably communicate with a base station. Moreover, the mobile communication system can reduce the handover failure ratio and the number of the handovers. In the mobile communication system, if quality information on the acquired data relates to data from a base station A, the mobile station (11) reports it to the base station A; and if the quality information relates to data from a base station B, the mobile station (11) reports it to the base station B. The base stations A and B report the quality information received from the mobile station (11) as history information on the mobile station (11) to a base station upper node device (14). The base station upper node device (14) compares the quality information received from the two base stations. The base station upper node device (14) selects the base station which has sent better quality and instructs the base station to communicate with the mobile station (11). The base station upper node device (14) instructs the other base station not to communicate with the mobile station (11).

Mobile communication system, base station, mobile station, and base station installation method

The present invention relates to a radio communications system and a radio communications method, and an object of the invention is to readily reduce the occurrence of collisions of contention channels. In order to achieve the object, radio resources are assigned in different orders between one radio communication and another one radio communication.

Wireless Communication System and Wireless Communication Method

[PROBLEMS] To provide an inter-base station synchronization system, a synchronization control device, and a base station capable of accurately synchronizing a plurality of base stations. [MEANS FOR SOLVING PROBLEMS] An inter-base station synchronization system includes a plurality of base stations (13) and a base station line collection device (12). The base station line collection device (12) has a control information generation unit (21) for generating synchronization control information. Each of the base stations (13) has a VCO (30) for oscillation with a frequency based on a control voltage inputted and a correction unit (33) for correcting the control voltage inputted into the VCO (30). Thus, it is possible to mutually synchronize the original oscillation clock in the plurality of base stations, suppress a phase difference between the base stations, and accurately synchronize the base stations.

Inter-base station synchronization system, synchronization control device, and base station

In a mobile communications system in which a mobile station is capable of communicating simultaneously with a plurality of base stations, the resources of the plurality of base stations are managed under the control of the mobile station. For example, the mobile station specifies a resource to a base station with a resource specifying signal, the mobile station specifies a resource to a base station with a resource specifying signal, and the mobile station specifies a resource to a base station with a resource specifying signal.

Mobile communications system, mobile station and base station

A base station control apparatus for controlling a radio base station which carries out radio communications with a mobile communication terminal is characterized in that it includes a control unit for performing a control process of making the radio base station selectively perform either of two or more processes with different throughputs according to the scale of the radio base station. With this structure, the radio base station can have only a function based on to the scale thereof. For this reason, by omitting unnecessary functions, the radio base station can be miniaturized and the manufacturing cost of the radio base station can be reduced.

Taisei Suemitsu

Papers

Mobile communication system, base station, mobile station, and base station installation method

Wireless Communication System and Wireless Communication Method

Inter-base station synchronization system, synchronization control device, and base station

Mobile communications system, mobile station and base station

Radio Base Station and Base Station Control Apparatus