BEIJING XINWEI TELECOM TECHNOLOGY INC. Patent applications |
Patent application number | Title | Published |
20160119871 | METHOD AND SYSTEM FOR WAKING SLEEPING TRUNKING TERMINAL UP - The present disclosure discloses a method and system for waking a sleeping trunking terminal. A trunking terminal determines whether to enter a sleeping mode in a standby status, calculates a waking monitoring time point of the group according to the group sleeping parameter of the group, enters the sleeping mode at a sleeping start time point of the trunking terminal, wakes up and monitors whether a group paging message is received at the waking monitoring time point of the group, wakes up, joins the group and monitors a group downlink sharing channel when the group paging message is received, and continues sleeping when the group paging message is not received. In a network side, a trunking switching center transmits a group establishment message to a base station. The base station calculates the waking monitoring time point, and transmits the group paging message at the waking monitoring time point. | 04-28-2016 |
20100296385 | USER SIGNAL TRANSMITTING AND RECEIVING METHOD, APPARATUS AND SYSTEM IN OFDMA SYSTEM - This invention provides a user signal transmitting method in an OFDMA system, where all the time-frequency grids of each timeslot are divided into sub-channels, each sub-channel comprises N | 11-25-2010 |
20100246641 | TIME-FREQUENCY CODE SPREADING METHOD AND APPARATUS IN OFDMA SYSTEM - The present invention provides a time-frequency code spreading method in an OFDMA system. The method includes: converting a transmission message into one or more modulating signal vectors, and each bit of the transmission message is spread onto all vector elements of a modulating signal vector; mapping one or more modulating signal vectors to a set of time-frequency grids, wherein in an OFDMA time-frequency plane, two time-frequency grids to which any two vector elements in each modulating signal vector are mapped do not have the same frequency location or time location. In addition, the present invention also provides a time-frequency code spreading apparatus in an OFDMA system. | 09-30-2010 |
20100238846 | WIRELESS COMMUNICATION SYSTEM BASED ON CODE SPREADING-ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS AND SMART ANTENNA - A time division duplex wireless communication system based on Code Spreading-Orthogonal Frequency Division Multiple Access (CS-OFDMA) and a smart antenna includes: an antenna array and multichannel transceiver, a space processor, a demodulator, an L2 processor and a modulator. The CS-OFDMA system provided by the present invention combines synchronous CDMA technique and OFDMA technique, overcomes the severe ISI caused by spectrum-spreading by the conventional CDMA system while transmitting wideband data, effectively counteracts frequency-selective fading and inter-cell interference, and is beneficial to reliable transmission of narrowband voice and wideband data and also beneficial to co-frequency networking. | 09-23-2010 |
20100220694 | Ranging Method and Apparatus in Wireless Communication System - The present invention provides a ranging method and apparatus, a frame structure includes one or more downlink service time slots, a guard interval between downlink sub-frame and uplink sub-frame and one or more uplink service time slots, and the method includes calculating start time of the first uplink service time slot, configuring the start time as reference time; generating a ranging signal; subtract a sum of time period needed for sending the ranging signal and reference time delay from the reference time and configure obtained time result as time of starting to send the ranging signal; subtract the length of a special ranging time slot from the reference time and configure obtained time result as time of starting to receive the ranging signal by a BS; receiving and processing the ranging signal. By the method and apparatus, all kinds of interference are minimized and an optimum ranging function is implemented. | 09-02-2010 |
20100208676 | Signal Transmission Method and Apparatus for OFDMA Wireless Communication System - Embodiments of the present invention provide a signal transmission method and apparatus used in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, to enhance stability of signal transmission and resist time-frequency dispersion. The signal transmission method used in the OFDMA wireless communication system provided by an embodiment of the invention includes: converting an L×1 symbol vector into an N×1 modulating signal vector according to a loading factor fed back by a receiving party, in which value of N is known, both L and N are natural numbers larger than one, N is larger than or equal to L, the loading factor is a ratio of L and N; mapping the N×1 modulating signal vector into N time-frequency grids; and converting the N time-frequency grids into a signal waveform and sending the signal waveform to the receiving party. | 08-19-2010 |