240 results about "Remote radio head" patented technology

A wireless communications system is disclosed. The system comprises a baseband processing unit (BBU) pool including one or more baseband processing units (BBUs), and a plurality of remote radio heads (RRHs) connected to the BBU pool through a front-haul network, wherein the wireless communications system has a plurality of sectors, each of which includes one or more small cells, each of which is deployed by one of the plurality of RRHs, wherein a BBUs is mapped to two or more RRHs in a sector in a one-to-many configuration, and a BBU is mapped to a single RRH in a sector in a one-to-one configuration, and wherein a combination of the one-to-one configuration and the one-to-many configuration is applied to each sector. Other systems, apparatuses, and methods also are disclosed.

A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifiers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and/or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.

The invention relates to a method for transmitting a plurality of antenna signals in a wireless Base Transceiver Station (BTS) using Remote Radio Head (RRH) technology and the corresponding system. The method includes the steps of: transmitting signals over the transmit channel using Synchronous Digital Hierarchy (SDH)/Optical Transmission Network (OTN), multiplexing the plurality of antenna signals adopting the manners of time division multiplex or GFP frame-level multiplex; forming the multiplexed antenna signal stream and in-band control signaling stream into Generic Framing Procedure (GFP) frame; or forming the plurality of antenna signals and the plurality of respective control signals on the in-band control signaling channel into a plurality of respective GFP frames in parallel; and further mapping the GFP frames to STM-N/OTM-n frames, therefore multiplexing the plurality of antenna signals and the in-band control signaling stream to realize the SDH/OTN-based transmission. According to the invention, in the circumstance of using a plurality of antennas for transmitting signals, the strict time and phase relations between various antenna signals can be ensured, and also system complexity can be simplified, the transmission delays from various antenna signals to CBTS are totally the same.

Delay measurement and delay calibration methods and apparatus are described for use within distributed wireless base stations employing a remote radio head topology. The methods and apparatus are usable in any system that requires accurate delay measurement and/or constant delay through an electronic device. The methods and apparatus for measuring delay embody a highly accurate distributed delay measurement architecture that handles multiple delay paths within distributed wireless base stations employing a remote radio head topology. The method and apparatus are amenable to implementation with current integrated circuit technology. The methods and apparatus for calibrating electronic delay within distributed base stations employing a remote radio head topology are useful for implementing distributed wireless base stations where transmit diversity is desired. Using the methods disclosed herein, delay within a distributed wireless base station can be measured and calibrated to achieve very deterministic delay characteristics at the system level.

A method and apparatus are provided that can combine the benefits of beamforming with transmit diversity. In one embodiment, the invention includes sampling a signal received from a remote radio at elements of an antenna array, deriving spatial parameters for transmitting a signal to the remote radio from an antenna array, sampling the signal received from the remote radio at elements of at least one additional antenna array, and deriving spatial parameters for transmitting a signal to the remote radio from the at least one additional antenna array. The invention further includes generating diversity parameters for transmitting a signal to the remote radio using each antenna array as an element of a diversity array, and transmitting a signal to the remote radio using the spatial parameters and the diversity parameters.

A central base station for interference management in a distributed antenna system comprises a processor; a memory; and a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster. Multiple clusters use the same frequency band and groups of clusters are formed. A joint scheduler is configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group. An interference alignment module is configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters.

A mobile communication system of the present invention includes a plurality of remote radio heads configured to transmit a signal to user equipment and configure an antenna network and a centralized baseband pool configured to be connected to the antenna network. The centralized baseband pool performs clustering with respect to the plurality of remote radio heads so as to dynamically vary the number of the remote radio heads each included in a plurality of clusters.

In one embodiment, a system for telecommunications includes a base band unit, a backhaul network, a shared network, a cascaded chain of remote radio heads, and an optical node coupled to the cascaded chain of remote radio heads. The backhaul network is coupled to the base band unit and to the shared network. The cascaded chain includes a first remote radio head coupled to a first set of antennas, a second remote radio head coupled to a second set of antennas. The second remote radio head is coupled to the first remote radio head through the shared network. The cascaded chain of remote radio heads is coupled to the shared network. The second remote radio head is configured to receive signals from the second set of antennas and communicate the signals to the first remote radio head. The first remote radio head is configured to receive signals from the first set of antennas, receive signals from the from the second remote radio head, and transmit the signals to the base band unit. The base band unit, the first remote radio head, and the second remote radio head communicate through a digital radio interface. The optical node is configured to communicate signals between the backhaul network and data subscribers accessing the shared network.

The present invention relates to a method for a terminal to perform a handover in a cloud radio access network (C-RAN), including the steps of: receiving information on at least one candidate remote radio head (RRH); measuring the strength of received signals from at least one candidate RRH and a serving cell for the terminal; and, when the strength of the received signals from the candidate RRH and the serving cell of the terminal satisfy a predetermined relationship according to the measured result, transmitting feedback information, including the measured result, to the candidate RRH.

A remote radio head is disclosed that comprises an interface for connecting the remote radio head to a base station via an asynchronous packet network, an absolute time reference source for (time-)synchronising a signal transceived by the remote radio head. A corresponding method for transmitting a transmit signal at a remote radio head comprises: receiving a data packet at an interface connecting the remote radio head to a base station via an asynchronous network, processing the data packet to form the transmit signal, determining an absolute time reference by means of an absolute time reference source local to the remote radio head, and transmitting the transmit signal in an absolute time-synchronised manner with respect to the absolute time reference. A method for receiving a receive signal at a remote radio head is also disclosed.

A system for routing signals in a Distributed Antenna System includes a plurality of Digital Multiplexer Units (DMUs). The plurality of DMUs are coupled and operable to route signals between the plurality of DMUs. Each of the plurality of DMUs is operable to receive a digital signal from a base band unit (BBU). The system also includes a plurality of Digital Remote Units (DRUs) coupled to at least one of the plurality of DMUs and operable to transport signals between DRUs and the at least one of the plurality of DMUs.

The invention belongs to the technical field of optical cables, and relates to an optical cable for a remote radio head. The optical cable comprises a central reinforcing part, a plurality of fillers, a plurality of tight-buffered optical fibers, peripheral reinforcing parts, a wrapping layer and a sheath layer. The optical cable is characterized in that the fillers and the tight-buffered optical fibers are distributed around the central reinforcing part at intervals and are parallel to the central reinforcing part, the peripheral reinforcing parts are positioned in cable core gaps formed by the central reinforcing part, the fillers and the tight-buffered optical fibers, the wrapping layer wraps the outside of the tight-buffered optical fibers, the sheath layer warps the outside of the wrapping layer in an extruded manner, and the diameter of each filler is larger than or equal to that of each tight-buffered optical fiber. The invention further discloses a manufacturing method of the optical cable. The optical cable mainly solves the problems that tight-buffered optical fibers are easily damaged by a cable twisting mode and are easily punctured by a wrapping layer and the like in the prior art. The optical cable has the main advantages of simple structure, easiness in manufacture, higher heat resistance and small additional attenuation change of the optical fibers used within a wide temperature range.

An apparatus and method for radio link monitoring in a wireless communication system are provided, in which a transmission point communicating with a network where a Base Station (BS) and at least one Remote Radio Head (RRH) coexist within a cell receives Reference Signal Configuration Information (RSCI) from the network to which the transmission point belongs, receives RSs of at least one RS type indicated by the received RSCI from the BS and the at least one RRH that coexist within the cell, and performs radio link monitoring using the received RSs of the at least one RS type.

The invention discloses a wireless communication networking method. The method includes the steps of distributing HPNs in an area providing service, arranging at least two fog remote radio heads (F-RRHs), conducting communication through a mode of directly having access to the HPNs when the movement speed of a user terminal is larger than a preset threshold value M1 or real-time voice service communication needs to be conducted, conducting communication through a local F-RRH mode when the movement speed of the user terminal is smaller than or equal to the preset threshold value M1 and the distance between the user terminal and a user terminal to be in communication with the user terminal is larger than a preset threshold value D1 and is smaller than or equal to a preset threshold value D2, and conducting communication through a global BBU pool mode when the movement speed of the user terminal is smaller than or equal to the preset threshold value M1 and the distance between the user terminal and the user terminal to be in communication with the user terminal exceeds the preset threshold value D2. By means of the method, the requirement for the capacity of fronthauls can be lowered, the signal processing pressure on a BBU pool in a cloud computing service can be lowered, and the transmission delay can be prolonged.

Disclosed is a method for a terminal deciding an uplink transmission power in a macro cell environment, comprising at least one remote radio head (RRH). The method for the terminal deciding the uplink transmission power, comprises the steps of: receiving from the base station configuration information on the base station and on a state channel information-reference signal (CSI-RS) of the at least one RRH and CSI-RS transmission power information; measuring the strength of a received signal of the CSI-RS which is received from the at least one RRH; and estimating downlink path loss that corresponds to a node that is set as a reception point or a reception RRH by using the configuration information on the CSI-RS and the CSI-RS transmission power information.

An improved digital radio head system and method for wireless communications is disclosed that simplifies the timing and synchronization between the access network, base station, and radio head. A satellite derived timing source is obtained at one or more of the remote radio heads where it is convenient to obtain and use the timing reference. The reference is transmitted back to the base station, if necessary, to synchronize the two. This is further synchronized at a lower accuracy through the access network.

A communication system improving the communication quality in a case where a plurality of communication devices having different sizes of ranges coexist, in which communication with a terminal device is possible, to thereby improve an entire throughput. In a case where a remote radio head (RRH) is installed in a coverage of a macro cell, an uplink resource transmitted from a user equipment (UE) to the macro cell, that is, an uplink carrier frequency band UL1 of the macro cell is received not only by the macro cell but also by the RRH. Then, the macro cell combines a reception signal regarding the uplink resource of the macro cell, which has been received by the macro cell, and a reception signal regarding the uplink resource of the macro cell, which has been received by the RRH.

The invention relates to a method of signal transmission between a host BTS and Remote Radio Unit(s), and the BTS communication system thereof. The transmission channel between the host BTS and the Remote Radio Unit(s) uses wideband transmission links or a network, the method includes the following steps of: performing the transmission over the transmission channel using a Synchronous Digital Hierarchy (SDH)/Optical Transmission Network (OTN), forming a digital wireless signal data stream and an in-band control signaling stream transmitted over the transmission channel into a Generic Framing Procedure (GFP) frame which is further mapped to a STM-N/OTM-n frame, thereby multiplexing the digital wireless signal data stream and the in-band control signaling stream to realize SDH/OTN-based transmission. As a result, the wireless signal can be effectively transmitted between the RRH and the host BTS without specific transmission network, and the management and maintenance operation required by the signal transmission and the networking cost can be reduced.