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283 results about "Listen before talk" patented technology

Listen Before Talk (LBT) or sometimes called Listen Before Transmit is a technique used in radiocommunications whereby a radio transmitters first sense its radio environment before it starts a transmission.

Method and system of using a RFID reader network to provide a large operating area

The present invention relates to a method and apparatus for using a RFID reader network to provide a large operating area, thereby enabling multiple RFID readers to simultaneously operate with minimal interference among all the RFID readers in the same network. The RFID network comprises a plurality of RFID readers connected to a server via a network backbone. Each operating RFID reader is associated with a group of neighboring RFID readers. A neighboring RFID reader is defined as a RFID reader that can detect tag responses for the communication between the operating RFID reader and its RFID tags. Each operating RFID reader sends its neighboring RFID readers at least one Tag Operation (TO) packet before starting to communicate with RFID tags and at least one End of Tag Operation (ETO) packet after the tag operation is completed. To avoid interference, each RFID reader uses a listen-before-talk scheme in which it checks if any TO packet has been sent by neighboring RFID readers before starting radio transmission. If both RFID readers are allowed to transmit, the RFID reader with a neighboring RFID reader just finishing transmission has the higher priority. This approach improves the throughput by taking advantage of the overlapped areas of neighboring RFID readers.
Owner:ZAI LI CHENG RICHARD +1

Power control for carrier aggregation on shared bands

There is provided, for example, an apparatus, which is caused to select a transmission power configuration for a communication with at least one user terminal taking place on component carriers of a carrier aggregation configuration within a shared band, wherein the selection is between a low transmission power configuration applying a transmission power below a predetermined power threshold without a listen-before-talk approach and a high transmission power configuration applying a transmission power of at least the predetermined power threshold; and upon detecting that the selected transmission power configuration needs to be informed, cause an indication of the selected transmission power configuration to the at least one user terminal and at least one secondary cell.
Owner:AVAGO TECH INT SALES PTE LTD

Adjustment method and system for channel occupation probability and equipment

The invention provides an adjustment method for channel occupation probability, an adjustment system for the channel occupation probability and equipment with a base station function. The adjustment method for the channel occupation probability comprises the following steps: adjusting parameter information, corresponding to a signal detection mechanism, of data to be sent according to the data type of the data to be sent of the equipment with the base station function; and adjusting the possibility of occupying a downstream channel of the data to be sent according to the adjusted parameter information, wherein the data type of the data to be sent comprises a found reference signal and/or downstream data. According to the adjustment method for the channel occupation probability, the capability of occupying the channel by an LBT (Listen Before Talk) mechanism for sending a DRS (Discovery Reference Signal) can be improved so that the found reference signal can more easily occupy the channel or at least has the channel occupation probability the same as that of an LBT mechanism for sending common downstream data, so that the power consumption caused by the fact that the reference signal DRS is measured by a terminal, and ell identification, downstream synchronization and time frequency estimation are carried out is reduced, and the accuracy is improved.
Owner:YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD

Base station, and method and system for measuring and feeding CSI (channel state information)

ActiveCN104579518AAppropriate modulation and coding methodIncrease usageTransmission monitoringChannel state informationEngineering
The invention provides a base station, and a method and a system for measuring and feeding CSI (channel state information) when an LTE (long term evolution) system works on unauthorized frequency bands. The method includes detecting current downlink channel states when downlink service arrives, and transmitting CSI measurement configuration signals and CSI feedback configuration signals, which correspond to the current downlink channel states, to terminals according to the current downlink channel states; or transmitting CSI measurement configuration signals and CSI feedback configuration signals, which correspond to specified downlink channel states, to the terminals when the downlink service arrives, and enabling the terminals to measure and feed the CSI according to the CSI measurement configuration signals and the CSI configuration signals, which correspond to the downlink channel states, after the downlink channel states are acquired. According to the technical scheme, the base station, the method and the system have the advantage that the CSI can be effectively assuredly normally measured and fed after LBT (listen before talk) mechanisms are introduced onto the LTE system on the unauthorized frequency bands.
Owner:SHENZHEN COOLPAD SOFTWARE TECH

Data synchronization method, synchronization system, equipment having base station functions and terminal

The invention provides a data synchronization method for an LTE (Long Term Evolution) system working under a time division duplex mode at an unlicensed frequency band, a data synchronization system for the LTE system working under the time division duplex mode at the unlicensed frequency band, equipment having base station functions and a terminal. The data synchronization method for the LTE system working under the time division duplex mode at the unlicensed frequency band comprises that a downlink channel detection subframe which is arranged inside a time division duplex mode frame structure and used for periodically detecting whether the downlink channel at the unlicensed frequency band is free or not sends a first reference signal when detects that the downlink channel is busy at any detection period to enable the equipment having the base station functions and the terminal of a current community in which the equipment having the base station functions is arranged to keep data synchronization. According to the technical scheme, the data synchronization between the equipment having the base station function and the terminal is guaranteed and the equipment having the base station function and the terminal are avoided from losing touch under the premise that the LTE system utilizes an LBT (Listen Before Talk) detection mechanism.
Owner:DONGGUAN YULONG COMM TECH

Radio terminal, radio station, and method performed thereby

A radio terminal (3) includes: a wireless transceiver (2001) configured to communicate with one or more radio stations using a licensed frequency and an unlicensed frequency; and at least one processor (2002). The at least one processor (2002) is configured to recognize whether LBT on the unlicensed frequency prior to uplink transmission needs to be performed, start the uplink transmission on the unlicensed frequency after performing the LBT when the LBT is needed, and start the uplink transmission without performing the LBT when the LBT is not needed. As a result, for example, the radio terminal can adaptively cope with the situation in which Listen Before Talk (LBT) by the radio terminal is needed and the situation in which it is not needed.
Owner:NEC CORP

Method and apparatus for determining LBT mode and the method for accomplishing LBT mode switching

ActiveCN106559795AImprove the efficiency of competing accessAvoid wastingConnection managementNetwork planningComputer scienceMode switching
The invention discloses a method and apparatus for determining LBT mode and the method for accomplishing LBT mode switching, comprising: based on related instruction information and / or priority information and / or measurement information, determining the listen before talk (LBT) mode or the LBT mode parameter set; and carrying out by a transmission device the contention access of channel according to the determined LBT mode and / or the LBT mode parameter set. According to the invention, it is possible to determine a LBT mode. Through the choice of the LBT mode, it is possible to avoid the wastes on the channel resources and instruction information by an improper LBT mode, therefore, increasing the efficiency of contention access of channel.
Owner:ZTE CORP

Lbt parameters for uplink in unlicensed spectrum

According to some embodiments, a method for use in a user equipment (UE) of managing a listen-before-talk (LBT) contention window size comprises receiving scheduling for a current burst of contiguous uplink subframes. For each subframe the scheduling comprises an associated hybrid automatic repeat request (HARQ) process identifier and a new data indicator (NDI). The method determines a reference subframe based on a previously-scheduled burst of contiguous uplink subframes. The reference subframe is associated with a reference HARQ process identifier. When the UE determines the HARQ process identifier associated with a subframe of the current scheduled burst of contiguous uplink subframes matches the reference HARQ process identifier and the NDI indicates new data, the method resets the LBT contention window. When the reference HARQ process identifier matches, but the associated NDI indicates a retransmission, or the HARQ process identifier does not match, the method increments the LBT contention window. According to another embodiment, a method is presented for performing uplink transmission according to LBT type and LBT priority class. According to a further embodiment, the contention window size for a UK is determined and sent to the UK.
Owner:TELEFON AB LM ERICSSON (PUBL)

Techniques for enhancing frame structure and listen before talk procedure (LBT) for transmissions using an unlicensed radio frequency spectrum band

Techniques are described for wireless communication. A method for wireless communication includes identifying a frame structure for transmissions using an unlicensed radio frequency spectrum band, the frame structure including at least two special subframes; and performing a procedure to gain access to the unlicensed radio frequency spectrum band during at least a portion of at least one of the at least two special subframes.
Owner:QUALCOMM INC
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