The present invention relates to a method and device for transmitting downlink control information in an LTE system.The device for transmitting downlink control information of the present invention allocates a part of a physical downlink shared channel (PDSCH) resource region to an enhanced physical downlink control channel (E-PDCCH) region, and transmits downlink control information (DCI) about a mobile communication terminal to a PDCCH or an E-PDCCH.
H04B 7/26 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
H04B 7/04 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées
In a HetNet environment having mixed heterogeneous networks, the physical downlink shared channel (PDSCH) start symbol of an extension carrier (EC) is determined by one network in consideration of the start symbol of a normal carrier (NC) backward-compatible component carrier (BCCC) on the same frequency in a different network.
H04B 7/26 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
3.
WIRELESS RELAY DEVICE HAVING INTERFERENCE CANCELLATION FUNCTION
The present invention relates to a wireless relay device, and particularly, to a wireless relay device having an interference cancellation function, wherein efficient data transmission is enabled by cancelling the interference phenomenon between an uplink and a downlink, which occurs in a relay node of an LTE system. According to the present invention, a wireless relay device having an interference cancellation function is a wireless relay device which provides a downlink signal applied from a base station to a terminal and provides an uplink signal applied from the terminal to the base station, wherein the wireless relay device comprises: a highly directional backhaul antenna that has a first beam width for transmitting and receiving a signal with said base station; an access antenna that has a wider second beam width than the first beam width of the highly directional antenna for transmitting and receiving a signal with said terminal; and a relay processing means that relays, to the base station or the terminal, the signals applied from the highly directional backhaul antenna and the access antenna.
A method and apparatus for adjusting a symbol decision threshold at a receiver in a communication network enables the receiver to be adapted to more correctly receive symbols as transmitted by a transmitter. In one embodiment, a received bit imbalance is detected by a receiver prior to error correction and after error correction to determine whether an error component of the received signal contains larger numbers of ones or larger numbers of zeros. Where the transmitter scrambles the signal prior to transmission, the receiver will also scramble the signal after error correction and prior to counting the number of zeros or ones. Any imbalance between the number of transmitted and received ones or zeros is used as feedback to adjust threshold values used by detectors to fine tune the manner in which the receiver interprets incoming signals.
An apparatus and a method for interference cancellation using a multi-user multiple input multiple output (MU-MIMO) scheme in a single carrier frequency division multiple access (SC-FDMA) system are disclosed. Received data of every terminal are classified into first received data and second received data. The first received data has lower reliability and the second received data has higher reliability than the first received data. The second received data is transmitted to an upper layer. Interference signals are formed with the second received data based on a channel estimation value. The interference signals are removed from the first received data, and the interference signal free first received data is transmitted to the upper layer.
Techniques for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON) are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON). The apparatus may include a digital signal processing device configured to output a pilot tone signal. The apparatus may also include an amplifier configured to modulate a modulation current and the pilot tone signal, and output an amplitude modulated signal. The apparatus may further include a capacitor configured to AC couple the amplitude modulated signal to a bias current applied to a light source; and a monitoring photodiode configured to detect an output optical signal of the light source and transmit the detected output optical signal to the digital signal processing device to control the output optical signal of the light source.
The present invention relates to a method for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON). In one exemplary embodiment, this method can be implemented with an apparatus for controlling a light source in the WDM-PON. The apparatus can comprise a digital signal processing device configured to output a pilot tone signal. Moreover, the apparatus can comprise an amplifier configured to modulate current and the pilot tone signal, for outputting an amplitude modulated signal. The apparatus can further comprise a capacitor configured to perform AC-coupling of the amplitude modulated signal with a bias current that is applied to the light source; and a monitoring photodiode configured to detect an output optical signal from the light source and then transmit the detected output optical signal to the digital signal processing device, for controlling the output optical signal of the light source.
According to the invention, an arrayed waveguide grating interconnects wavelength channels between an optical fiber trunk of wavelength division multiplexed passive optical networks (WDM-PON) and multiple branch fibers of the WDM-PON, in a WDM-PON including a system for distributing an uplink signal, a downlink signal, and RF/video broadcast signals. The WDM-PON realizes a channel scheme containing a predetermined free spectrum width and at least three spectrum segments. Each segment has a width identical to the free spectrum width. The WDM-PON has an optical terminal which receives a wavelength division multiplexed uplink signal in a first segment from among the spectrum segments, and receives a wavelength division multiplexed downlink signal in a second segment from among the spectrum segments. The channel schemes are identical in both the first segment and the second segment. An RF/video transmitter generates an RF/video signal in a third segment from among the spectrum segments.
A method of managing cells of base stations (BSs) and a mobile telecommunication system for the same, capable of allowing a user equipment (UE), which had not been permitted, to access the CSG BS if the UE meets an access condition, are disclosed. In accordance with the method and the system, an outdoor BS, manages a list of indoor BSs of a CCSG selected among indoor BSs of the CSG. The indoor BSs of the CCSG allow the UE to access the indoor BSs of the CCSG when the UE meets an access condition. The outdoor BS broadcasts a reporting criteria and reporting information, receives measurement values that meet the reporting criteria and an identity of the indoor BS as the reporting information from the UE, recognizes the environment of the UE based on the measurement value, checks the identity of the indoor base station in the list of the CCSG and allows the UE to access the indoor base station based on a check result.
A method of recognizing states and locations of user equipment in a network by using a random access (RA) channel at a base station without alteration of the conventional network environment or configurations of user equipment. A mobile communication system of an embodiment includes a first base station; and one or more second base stations having service regions smaller than a service region of the first base station. The first base station is operable to broadcast configuration information to the user equipment for connecting to at least one of the one or more second base stations. The user equipment is operable to transmit an uplink signal to at least one of the one or more second base stations in accordance with the configuration information received from the first base station, and at least one of the one or more second base stations is operable to transmit information on the user equipment that transmitted the uplink signal to the first base station after receiving the uplink signal.
A system for overlaying an broadcast channel in a Wavelength Division Multiplexed Passive Optical Network (WDM-PON). A remote node of the WDM PON includes a MUX/DEMUX for demultiplexing a Wavelength Division Multiplexed (WDM) signal and supplying respective wavelength channels to each one of a plurality of channel fibers; an optical power splitter for supplying the broadcast channel to each one of a plurality of distribution paths; and a respective optocoupler connected to each distribution path, each optocoupler coupling the broadcast channel into one of the channel fibers. The broadcast channel has a wavelength that is outside at least a wavelength band of downlink signals of the WDM signal. An Optical Network Terminal (ONT), which is connected to one of the channel fibers, includes a triplexer for separating the broadcast channel from at least a downlink wavelength channel of the WDM-PON.
Embodiments of the present invention may provide an apparatus and a method for transmitting and receiving a random access channel (RACH) in a single carrier-frequency division multiple access (SC-FDMA) system. A frequency domain RACH signal may be mapped to a localized sub-frequency band of an entire frequency band available to the SC-FDMA system. A guard band including at least one sub carrier may be allocated between the RACH signal band and other channel signal bands. A guard time may be allocated between the RACH signal and other channel signals in the time domain. The RACH signal may include a short message including information related to a mobile station. The RACH signal may be detected in a frequency based method, a time based method or a sliding matched filter based method. Receiver complexity can be decreased if the RACH signal includes a CAZAC code sequence for a preamble. In such a case, a receive delay may be simply calculated and then adjusted more accurately.
An apparatus and method for maximizing throughout for HARQ transmissions is provided. Systematic and prodeduralized RV selection is facilitated by determining the parameter “s” by using two important factors affecting the system throughout, specifically the coding gain varying according to the code rate and the balance between energy per systematic bit and energy per parity bit.
H03M 13/00 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes
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