The present invention is designed to improve spectral efficiency in a radio communication system which can use non-orthogonal multiple access (NOMA). Steps are provided in which a radio base station configures one of a plurality of transmission mode including a first transmission mode, which groups a plurality of transmission methods including a transmission method to employ non-orthogonal multiple access (NOMA) and multiple-user multiple-input and multiple-output (MU-MIMO), and a second transmission mode, which groups a plurality of transmission methods including a transmission method to employ this NOMA and open-loop transmit diversity, and transmits a downlink signal for this user terminal based on the configured transmission mode.

Radio base station, user terminal, and radio communication method

A first UL-DL configuration configured by using a common RRC message is set; an antenna port for one enhanced physical downlink control channel in a subframe is set based on whether or not the subframe is a predetermined special subframe in the first UL-DL configuration; and in a case where a second UL-DL configuration indicated by downlink control information which is transmitted on a physical downlink control channel is set, an antenna port for one enhanced physical downlink control channel in the subframe is set based on whether or not the subframe is the predetermined special subframe in the second UL-DL configuration.

Terminal device, base station device, and communication method

Among other things, a communication system comprising remote units and a controller is described. Each of the remote units comprises one or more radio frequency (RF) units to exchange RF signals with mobile devices. At least some of the RF signals comprise information destined for, or originating from, a mobile device. The controller comprises one or more modems and is connected to an external network. At least one of the modems is a baseband modem and is configured to pass first data corresponding to the information. The at least one of the modems is configured to perform real-time scheduling of the first data corresponding to the information. The controller is separated from the remote units by an intermediate network. The intermediate network comprises a switched Ethernet network over which second data corresponding to the information is carried in frames between the controller and the remote units.

Radio access networks

A method in a wireless communication terminal is disclosed. The method includes receiving a first signal including a desired second signal and an interference component, wherein the interference component includes at least a third signal transmitted in an Almost Blank Subframe (ABS) by a neighbor cell, and configuring the wireless communication terminal to employ interference reduction to process the first signal based on a configuration of the interference component.

Positioning Reference Signal Assistance Data Signaling for Enhanced Interference Coordination in a Wireless Communication Network

A wireless communication terminal is disclosed The terminal includes a transceiver coupled to a processor configured to estimate a signal power associated with a second transmission from a second base station, wherein the second transmission is part of a signal received at the terminal wherein the signal includes a first transmission from a first base station and the second transmission from the second base station The processor is also configured to estimate a Receive Signal Strength Indicator (RSSI) of the received signal, and to subtract the signal power associated with the second transmission from the estimated RSSI to obtain a modified RSSI

Interference measurements in enhanced inter-cell interference coordination capable wireless terminals

Disclosed are a base station device and a user terminal that provide a favourable search space in a communication system which expands bandwidth by gathering a plurality of basic frequency blocks. A base station device (20) comprises: a selection unit (302) which selects a single basic frequency block from the system band; a downlink control information generation unit (306) which generates downlink control information for demodulating a data channel transmitted discretely on the selected basic frequency block, and provides a search space with aggregated downlink control information for a plurality of basic frequency blocks on a downlink control channel of a designated basic frequency block among the plurality of basic frequency blocks; and a transmission means (203) which transmits on the downlink control channel provided in the aggregated downlink control information in the search space.

Base station apparatus and user terminal

The invention discloses a frequency spectrum cognitive method, cognitive radio user equipment and the structure of a central node in a cognitive radio system. In the frequency spectrum cognitive method, at least one cognitive radio user in the cognitive radio system detects signals of a main user in a selected channel, and sends the detection result to the central node of the cognitive radio system, wherein the detection result is the parameter correlative with the average signal-to-noise ratio of the channel; and the central node combines the detection results from all the cognitive radio users detecting the same channel, makes the conclusive judgment according to the result of the combination to obtain the judgment result on whether the channel is occupied by the main user in a main usersystem, and can further return the result to all the cognitive radio users. Besides, the invention also discloses a method and a device for energy detection.

Frequency spectrum cognitive method and energy detection method and device

IMT-advanced is expected to provide much higher cell spectrum efficiency than current cellular systems. In order to improve the uplink cell spectrum efficiency of cellular systems, a superimposed radio resource sharing (SRRS) method is proposed in this paper through fully exploiting near-far effect and channel differences of multiple user equipments (UE) in the cellular system. Simulations are performed and verify the effectiveness of the proposed method. Simulation results show that the uplink cell spectrum efficiency can be greatly improved compared with the existing scheme.

Superimposed radio resource sharing for improving uplink spectrum efficiency

The present invention discloses a method and apparatus of physical resource allocation as well as a method of data receiving and a receiving end in a wireless communication system. The method of physical resource allocation includes: detecting a pilot signal sent by each user within a designated range; obtaining received power of the pilot signal sent by each user; scheduling each user within the designated range to obtain a user group including at least one user according to the received power; and allocating a same physical resource to each user of the user group. According to the method and the apparatus, it is possible to reuse a physical resource and sequentially decode data packets corresponding to users in a user group occupying the same physical resource according to the Capture Effect and interference cancellation technology, thereby improving the spectrum efficiency and throughput of uplink or downlink greatly.

Method and apparatus of physical resource allocation, method of data receiving, and receiving end

Dynamic frequency management is considered to be beneficial for the uncoordinated self-deployment of Home eNB (HeNB) in LTE-A heterogeneous networks. In this paper, a new autonomous component carrier (CC) selection scheme is proposed that dynamically selects the CC with efficient inter-cell signaling design. The CC selection criterion is to minimize the interference contribution composed of the incoming and outgoing interference. Additionally, power control and weighted proportional fair (PF) scheduling are used to further improve the cell-edge performance. The proposed inter-cell signaling between HeNBs is independent of CC number, user number and CC allocation results in HeNB network, thus the inter-cell signaling overhead can be greatly reduced. Simulation results show that the proposed CC selection scheme can autonomously achieve high cell-average and cell-edge throughput. This distributed and adaptive scheme performed locally at each HeNB is suitable for the uncoordinated HeNB deployment without centralized control unit.

Yuan Yan

Papers

Base station apparatus and user terminal

Frequency spectrum cognitive method and energy detection method and device

Superimposed radio resource sharing for improving uplink spectrum efficiency

Method and apparatus of physical resource allocation, method of data receiving, and receiving end

A New Autonomous Component Carrier Selection Scheme for Home eNB in LTE-A System