306 results about "LTE Advanced" patented technology

The invention discloses a downlink control information processing method which comprises: a master physical downlink control channel on a carrier unit supported by a terminal and at least one slave physical downlink control channel attributive to the master physical downlink control channel are set; wherein, the master physical downlink control channel is used for carrying the reference information of the slave physical downlink control channel; the reference information comprises at least one of the following: the position information of the slave physical downlink control channel, the format information of the slave physical downlink control channel and all the downlink control information of the slave physical downlink control channel for carrying the terminal. A transmitting method for the downlink control information in an LTE-Advanced system is provided by the invention; compared with the prior art, the downlink control information processing method can compatible with LTE-Advanced and LTE Release-8, improves the dispatching flexibility and the throughput of the LTE-Advanced system and reduces the blind detection times of the terminal.

The invention discloses a method of sending uplink hybrid automatic retransmission request (HARQ) feedback information; the method includes that: a terminal and a base station determine PHICH resource according to the index of downlink component carrier of physical hybrid retransmission indication channel (PHICH), PHICH group number and the index of orthogonal sequence in PHICH group; the base station transmits uplink HARQ feedback information based on determined PHICH resource. The invention also discloses a device for transmitting uplink HARQ feedback information and solves the transmissionproblem of uplink HARQ feedback information in advanced long-term evolution system (LTE-Advanced), and ensures LTE-Advanced terminal to operate normally in spectrum aggregation mode and enables the LET-Advanced to be compatible with LTE Release-8, and facilitates improving the scheduling flexibility and throughput of system.

The invention provides a PUCCH indication method for large bandwidth system. Physical uplink control channel PUCCH resource transmits uplink mixed automatic retransmission request confirmation and corresponds to dynamically dispatched physical downlink sharing channel; index number of uplink component carrier frequency of physical uplink control channel PUCCH resource is mapped by downlink component carrier frequency index of physical downlink control channel PDCCH for dispatching the PDSCH to acquire, or a fixed value, or notified by high level signaling or physical signaling. Index number of uplink component carrier frequency of PUCCH resource for uplinkly transmitting HARQ-ACK corresponding to semi-static scheduled PDSCH is mapped and acquired by downlink component carrier frequency index number of PDSCH or notified by high level signaling. The invention guarantees compatibility of LTE-Advanced system and LTE Release-8 system, facilitates to increase system capacity and scheduling agility of LTE-Advanced system.

The invention discloses a method for transmitting downlink control signaling of a LTE-Advanced system and aims to effectively reduce the frequency of a UE blind test. The method comprises the following steps: carrying out first cascade connection of CRC check codes of special DCI and the downlink control signaling; masking the CRC check codes by using RNTI of the UE to obtain a cascade connection mask sequence; coding indication information of the special DCI to obtain a special DCI indication information coding sequence; carrying out coding and speed matching of the cascade connection mask sequence to obtain a cascade connection mask coding sequence; carrying out second cascade connection and reordering of the special DCI indication information coding sequence and the cascade connection mask coding sequence to obtain an information block corresponding to a PDCCH of the UE; and processing and mapping the information blocks of a plurality of PDCCHs of a subframe to resource elements for transmitting. The technical proposal reduces the frequency of the UE blind test, the implementation complexity of UE and the probability of CRC false detection.

The Long Term Evolution Advanced (LTE-A) network, is a heterogeneous network, where macro and pico base stations (BSs) coexist to improve spectral efficiency per unit area. Systems and methods described herein attempt to provide a solution to the interference coordination problem between macro BSs and pico user equipments (UEs). Specifically, the systems and methods conduct interference coordination based on the concept of almost blank subframe (ABS), which is supported by the LTE-A standard. The macro BSs choose their ABS configurations in a cooperative way such that the overall system throughput is optimized.

A method of allocating resource elements in an orthogonal frequency division multiplexing (OFDM) system for transmission of a channel state information reference signal (CSI-RS) is disclosed. The method includes converting resource elements to a two-dimensional frequency-time domain. The converted resource elements can then be partitioned to units of a physical resource block (PRB), which can be one subframe, for example. It can be determined whether a portion of a PRB is being used by another signal; and if the portion of the PRB is not being used, it can be allocated for transmission of the CSI-RS. The CSI-RS can be transmitted at resource element locations determined by the resource elements available to the CSI-RS in a regular or a frequency-division duplexing (FDD) downlink subframe, for example. The CSI-RS can be transmitted in a downlink subframe configured as a Multi-Media Broadcast over a Single Frequency Network (MBSFN) or a non-MBSFN subframe.

Systems and methods are provided for enabling different “bundling” methods for downlink transmissions and provide different interpretations of the acknowledgement / negative-acknowledgement bit. A user equipment is configured so that it commonly acknowledges all downlink transmission time intervals within a bundle so that if one packet is determined to be erroneous, all packets in that bundle will be retransmitted. Additionally, the systems and methods are implemented by allowing an interpretation to be applied to the uplink acknowledgement / negative-acknowledgement field such that the user equipment is able to divide bundled downlink packets into smaller windows in Long Term Evolution (LTE) Release 8 time division duplex (TDD) mode. In LTE Advanced (LTE-A) TDD mode, various embodiments provide bundling within the time domain, within the frequency domain, and within a hybrid time-frequency domain. Furthermore, enhanced channel selection methods are also provided in support of the above-mentioned bundling methods in accordance with various embodiments.

This invention is a method of wireless communication between a base station and at least one user equipment. The base station signals a user equipment to produce a burst of a number of sounding reference signals having a predetermined burst duration. The user equipment sounds wireless channel to the base station via a burst of sounding reference signals having the predetermined burst duration. The base station schedules transmission of user equipment in time and frequency domain according to a CQI estimated from the received sounding reference signals.

Disclosed is a wireless communication system and terminal for providing a wireless communication service, and more particularly, a method of effectively perform an operation of MDT (Minimization Driving Test) for a specific area or a specific cell in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from a UMTS, Long Term Evolution (LTE) System or LTE-Advanced (LTE-A) system.

There are provided measures for enhanced admission control in relay-enhanced access networks, said measures exemplarily including receipt of a bearer admission request of at least one bearer in a relay-enhanced access network, said at least one bearer consisting of a bearer on an access link between a user equipment and a relay node and a bearer on a backhaul link between said relay node and a base station, and execution of a combined bearer admission control of said at least one bearer at one of said relay node and said base station, including a bearer admission control on the access link and a bearer admission control on the backhaul link. Said measures may exemplarily be applied for enhancing admission control in relay-enhanced LTE and LTE-Advanced access networks.

Systems and methods for the configuration of channel state information reference signals (CSI-RS) are disclosed. The systems and methods include providing user equipment with the locations of CSI-RS reuse information. Several encoding patterns and exemplary methodology for both the identification of the CSI-RS resource element locations are provided in exemplary embodiments. In addition, exemplary embodiments provide muting methods and systems for a physical downlink shared channel resource elements.

A method and apparatus for transmitting / receiving reference signals in Long Term Evolution (LTE) and LTE-Advanced (LTE-A) systems includes determining whether a dedicated reference signal is detected in a current subframe; estimating, if a dedicated reference signal is detected in the current subframe, a data channel using the dedicated reference signal to receive data; and estimating, if no dedicated reference signal is detected in the current subframe, a data channel using a common reference signal detected in the current subframe to receive data. The transmission scheme uses a DeModulation Reference Signal (DM-RS) for channel response estimation. To secure backward compatibility of the LTE-A system, a Common Reference Signal is transmitted in normal subframes.

Channel state information (CSI) and acknowledgement (ACK) reporting enhancements in Long Term Evolution (LTE) / LTE-Advanced (LTE-A) enabling communications over an unlicensed spectrum are disclosed. For example, ACK / NAK may include unlicensed spectrum interference information, such as WIFI interference. Additionally, in anticipation of a future downlink transmission, UEs may report WiFI interference to base stations absent a current downlink transmission. Also, CSI-RS and / or IMR resources may be staggered across subframes and / or within slots of subframes. Further, CSI reporting may include separate reports for CSI-RS resources that experience unlicensed spectrum interference and interference free CSI-RS resources. Still further, CSI reports may include a request to the base station to switch the current channel or band. Finally, inter-RAT ACK and CSI reporting may be provided on a second unlicensed spectrum band, such as a WIFI band, for a first unlicensed spectrum band, such as an LTE / LTE-A unlicensed band.

A method and apparatus for supporting synchronous Hybrid Automatic Repeat reQuest (HARQ) transmission of Uplink are disclosed. When uplink / downlink configurations of multiple CA cellsrrier Aggregation (CA) are different, by configuring the HARQ transmission timing relations of primary cell and secondary cell, it is guaranteed that, with cross-carrier scheduling, the timing relation between a transmission of PUSCH in the Pcell and subsequent retransmission of PUSCH in the Scell is the same as that in Long Term Evolution (LTE) and LTE Advanced (LTE-A).

Disclosed is a method of managing an X2 interface, a handover method, an interference coordination method and an apparatus for LTE and LTE-Advanced system. X2 interface management includes: finding by a first eNB, a new neighboring cell, i.e., a second cell corresponding to a second HeNB; determining by the first eNB, an access mode of the second cell; and establishing a first X2 interface between the first eNB and the second HeNB when the access mode of the second cell is an open mode or a hybrid mode. The X2 interface may be managed dynamically and the mode for establishing the X2 interface, such as direct X2 interface or gateway-proxied X2 interface, may be selected. The expansible problem and system overhead due to the X2 interface in the LTE and LTE-Advanced system may be reduced effectively to better support handover and interference coordination.

This invention mitigates interference in wireless telephony in heterogeneous networks having a macro base station and a low power base station. This invention attempts to avoid cross carrier scheduling on an anchor carrier and a non-anchor carrier. If cross carrier scheduling is unavoidable, then this invention attempts: (1) semi-statically signalling a CFI value on a cross-scheduled component carrier; (2) semi-statically signalling a channel quality information (CSI) value on a cross-scheduled component carrier setting a Physical Hybrid ARQ Indicator CHannel (PHICH) value to be maximum; or (3) semi-statically signalling a channel quality information (CSI) value on a cross-scheduled component carrier using Physical Control Format Indicator CHannel (PCFICH) power boosting on cross-scheduled component carriers (CC).

The present invention provides a method executed by a base station. The method comprises: (S320) generating a code word sequence comprising system information of the base station; (S330) modulating the code word sequence, and generating a physical broadcast channel (PBCH) sequence; (S340) selecting a physical resource block (PRB) for each PBCH in the PBCH sequence; and (S350) executing the mapping between the PBCH and a resource element (RE) in the selected PRB. The PRB has a distributed PRB frequency division multiplexing format or an integrated PRB frequency division multiplexing format. The present invention further provides a method executed by a user equipment and a corresponding base station and a user equipment. By using the present invention, the energy utilization rate can be enhanced and the frequency spectrum efficiency in an LTE-Advanced system can be improved, and time / frequency resource conflicts between cells can be reduced.

Communication systems may benefit from a control channel for contention based transmission and collision avoidance. For example, communication systems of the third generation partnership project (3GPP) long term evolution (LTE) and LTE-Advanced may use such control channels for contention based transmission. In particular, such control channels may be valuable with respect to LTE-based local area network (LTE-LAN). A method, according to certain embodiments, may include preparing control information for a contention based physical uplink shared channel. The method may also include transmitting and / or receiving the control information on a physical uplink control channel and a control only physical uplink shared channel, or only on the control only physical uplink shared channel.

Embodiments described herein are directed to a power control scheme for Long Term Evolution Advanced (LTE-A) heterogeneous networks to reduce the interference from macro base stations (BS) to pico user equipment (UE). The embodiments described herein may be used to develop LTE-A heterogeneous networks to balance the achievable throughput between macro and pico UEs and may thereby improve the overall system performance.

The present invention discloses a method and a system for obtaining downlink control information in MBSFN sub-frame, wherein the method comprises the steps that: a base station transmits downlink control information to user equipment (UE) according to a determined downlink transmission mode; the UE obtains the downlink control information according to a corresponding downlink control information format in the determined downlink transmission mode on (single-frequency network multicast / broadcast) MB SFN sub-frame. In the present invention, solving method is provided aiming at the problems that how the MB SFN sub-frame in LTE-Advance version R10 obtains the downlink control information, so as to perform PDSCH demodulation, and how the downlink transmission mode is configured. The downlink control information in the MB SFN sub-frame is obtained in the LTE-Advance system, so that the demodulation of PDSCH in special MB SFN sub-frame of LTE-A UE of LTE-Advance system is realized.

Disclosed is a wireless communication system and terminal for providing a wireless communication service, and more particularly, a method of selectively applying a PDCP function based on data characteristic transmitted through a radio bearer in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from a UMTS, Long Term Evolution (LTE) System or LTE-Advanced (LTE-A) system.

The invention provides an uplink synchronization method, device and system, relates to an LTE-Advanced system, and solves the problem that a first communication node and a second communication node cannot normally communicate. The method includes that: the first communication node configures resource set information corresponding to N uplink receiving wave beam groups, wherein the N is greater than 0, and each uplink receiving wave beam group includes at least one uplink receiving wave beam; the first communication node detects and receives an uplink access signal on resource sets corresponding to one or a plurality of receiving wave beams according to the resource set information; and after the first communication node detects the uplink access signal, the first communication node sends uplink access response information to the uplink access signal which meets an uplink access condition. The technical scheme is suitable for the LTE-Advanced system, configuration confirmation of both communication parts on the uplink access wave beams can be achieved.

Provided is a multi-layer transmission method of multiplexing and transmitting data and a demodulation reference signal (DM-RS) sequence in an uplink digital Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) transmission employing multiple-input multiple-output (MIMO). The method includes allocating one DM-RS sequence as a DM-RS sequence of a first transmission layer for uplink transmission; allocating a DM-RS sequence whose cyclic shift (CS) value having the same sequence as the DM-RS sequence of the first transmission layer is configured to differ from that of the DM-RS sequence as a DM-RS sequence of a second transmission layer; and multiplexing layer-specific data and the layer-specific DM-RS sequences according to each of the first and second transmission layers. Accordingly, an RS can be transmitted in more OFDM symbols of a slot or subframe without an increase in overhead. Consequently, it is possible to satisfy requirements of LTE-advanced that a high frequency spectrum and a high mobile velocity should be supported, and transmit and receive a DM-RS multiplexed with data while maintaining orthogonality.

The present invention relates to a wireless communication system and a user equipment (UE) providing wireless communication services, and more particularly, a method of preventing transmission error of data while maintaining its security and a method of controlling an access of a Relay Node (RN) to a Donor eNB (DeNB) and an access of the UE to the RN during a process of transmitting and receiving user data when the RN as a radio network node is connected to the DeNB in an Evolved Universal Mobile Telecommunications System (E-UMTS), a Long Term Evolution (LTE) system, and a LTE-Advanced (LTE-A) system that have evolved from a Universal Mobile Telecommunications System (UMTS).

The invention discloses a data transmission method in a larger-bandwidth system. After a post-accumulative carrier frequency is divided to more than one component carrier frequency, data in a physical channel carrier or a measuring pilot signal is transmitted between component carrier frequencies in a frequency hopping manner. The invention has the advantages of ensuring the compatibility of an LTE-Advanced system and an LTE Releaste-8 system, facilitating the increase of the system capacity and the scheduling flexibility of the LTE-Advanced system, and enabling a LTE-Advanced terminal to acquire the selective gain of the biggest frequency.

The present invention relates to a wireless communication system and UE providing wireless communication services, and a method of transmitting and receiving data between a terminal and a base station in an evolved Universal Mobile Telecommunications System (UMTS) that has evolved from a Universal Mobile Telecommunications System (UMTS), a Long Term Evolution (LTE) system, or a LTE-A (LTE-Advanced) system, and more particularly, to a method of releasing an access restriction at high interference cell, such that an effect of the interference can be minimized.

The present invention relates to a wireless communication system and UE providing wireless communication services, and a method of effectively performing a handover procedure in an evolved Universal Mobile Telecommunications System (UMTS) that has evolved from a Universal Mobile Telecommunications System (UMTS), a Long Term Evolution (LTE) system, or a LTE-A (LTE-Advanced) system and it may be an object of the present invention to perform the handover procedure without terminating a data transmission between a terminal and a base station by utilizing carrier aggregation scheme, which allows a high-speed data transmission by using a plurality of frequencies.

The invention discloses a multi-access interference elimination method of an uplink multiuser MIMO system, which relates to an advanced long term evolution system (LTE-Advanced). At the reception end of a base station, a null space matrix is obtained by utilizing the channel state information of the paired users and then constructed into a transformation matrix which does not reduce the channel multiplexing degree; and the transformation matrix is utilized to process a received signal so as to eliminate the multi-access interference between the paired users. When the users are scheduled, the different users using the same codebook are restricted from occupying a same time frequency resource and the probability that the users with relatively larger channel relativity are paired with each other is decreased, so as to minimize the influence of the transformation matrix on the effective signal strength. Simulation shows that the invention can remarkably reduce the multi-access interference of the uplink multiuser MIMO system, improve the signal to noise ratio of the user and enhance the system throughput.

The invention provides a method for preventing a conflict between moving load balance and moving robustness optimization function, which adopts the main idea that when the moving load balance operation is carried out in an LTE-Advanced network, the adjustment of the moving load balance to a switching threshold needs to be limited in the tolerance range of the moving robustness optimization so as to prevent various switching problems caused by inaccurately adjusting the switching parameter by the moving load balance.