120results about How to "Backward Compatibility Guaranteed" patented technology

A method of sending data in a multiple antenna system includes the steps of generating a transmission signal by applying channel-dependent precoding to a first antenna cluster and a second antenna cluster, each comprising a plurality of antennas, wherein the channel-dependent precoding is performed by a precoding weight matrix in which a precoding weight for each of the antenna clusters has a block diagonal form and the precoding weight is represented by P×V for a number of transmission antennas P, included in each of the antenna clusters, and a number of layers V applied to each of the antenna clusters (P and V are an integer greater than 0) and sending the transmission signal.

The invention discloses a method for obtaining up time advance in carrier aggregation. A plurality of up CC are divided into a plurality of groups by eNB; the quantity of up CC in each group is at least one; grouping information and marks of groups of all the up CC are informed to UE; eNB configures different TA values for all the groups; each group of UE respectively obtains TA value corresponding to the group through a random access process; and each up CC group in the group takes the TA value corresponding to the group as a TA value corresponding to each up CC group. The method can ensure that one UE obtains a plurality of TA values.

Disclosed are a method and a device for CSI-RS port configuration and CSI-RS transmission. The method for port configuration comprises: dividing the CSI-RSs of a number X of ports in a 3D-MIMO system into X/8 sets of CSI-RSs, with the CSI-RSs of eight ports being a set, and the CSI-RS pattern of each CSI-RS set being compatible with a specific eight-port CSI-RS pattern, wherein X＝8*n, and n is an integer greater than or equal to 2; using FDMA and/or TDMA for distributing resources among the different CSI-RS sets. In the embodiment of the present application, by means of applying necessary enhancements and expansion to present CSI-RS pattern design, CSI-RSs of more logical ports in the 3D-MIMO system are supported. Furthermore, by means of introducing new indication signaling for supporting detection of 3D-MIMO multi-port CSI-RS configurations in user equipment, the backward compatibility of network side CSI-RS configuration and CSI-RS detection by user equipment is maintained to the greatest degree.

Discloses are a method and device for monitoring a control channel in a wireless communication system. A user equipment receives a CFI (control format indicator), indicating a size of a control region within a subframe, via a first downlink control channel and confirms whether or not an extended control region is present in the subframe. If the extended control region is present in the subframe, the user equipment monitors a PDCCH (physical downlink control channel) within the control region and the extended control region.

The invention provides a sync signal mapping method and a sync signal mapping device for a relay link. In the invention, a synchronizing sequence is generated, the mapping positions of sync signal in a frequency direction and a time direction are determined, and thus a specific sync signal mapping manner of a back haul link from a base station to a relay node is realized. The sync signal mapping method and device are well applied to the back haul link from the base station to the relay node, and the sync signal mapping manner is simple; therefore, backward compatibility (compatible with an LTE system) is ensured, and the problem that the relay node cannot correctly receive the primary sync signal (PSS) and the supplementary sync signal (SSS) transmitted from the base station is solved. In the method, a low cost is adopted and a normal completion of tracking by the relay node is ensured.

The invention relates to a method for transmitting control information, a method and device for receiving control information. The method for transmitting control information comprises the steps of: scrambling cyclic redundancy check (CRC) bits of different carriers by adopting different kinds of scrambling information, wherein the cyclic redundancy check bits of different carriers are obtained through carrying out cyclic redundancy check on control information of the different carriers; and sending the control information and the scrambled cyclic redundancy check bits. The CRC bits of the different carriers are scrambled by different kinds of scrambling information to ensure that the scrambling information corresponds to the carriers one by one, thus the different carriers of the same device are distinguished to ensure that UE (User Equipment) side can obtain the control information of different carriers of the device through a PDCCH (Packet Dedicated Control Channel), so that a plurality of downlink or uplink carriers are controlled by one downlink carrier PDCCH, and the backward compatibility is maximally maintained without remarkably increasing the processing complexity of the UE.

The invention discloses a method and system for selectively switching return link subframe configurations in a time division duplex (TDD) system. The method comprises the following steps: a network side selects and determines the target return link subframe configuration according to the influence factors of the target return link subframe configuration and notifies a relay node (RN) of the target return link subframe configuration; and the RN switches the original return link subframe configuration which is being used at present to the target return link subframe configuration according to the target return link subframe configuration selected and determined by the network side. The invention has the following beneficial effects: the method and system are used in the process of switching the return link subframe configurations changed by the network side; and not only the backward compatibility is ensured but also the problem of selecting appropriate target subframe configuration for return link subframe configuration switching is solved while not introducing the signaling overhead.

The invention provides a configuration and indication method of relay sub-frames as well as a method and system for realizing relay transmission, wherein the methods and system provided by the invention are applied to a TDD (time division duplex) system comprising at least one base station and a relay station. The configuration method comprises the following steps: aiming at uplink and downlink configurations on used sub-frames, creating one or more relay sub-frame configuration sets for carrying out uplink and downlink communications between the base station and the relay station; and forming a sub-frame combination by an uplink sub-frame and each downlink sub-frame in the same relay sub-frame configuration set, wherein the sub-frame combination is one of combinations of uplink sub-frames and downlink sub-frames for downlink service transmission and corresponding uplink ACK (acknowledgement)/NACK (negative acknowledgement) feedback information transmission under the uplink and downlink configuration of the sub-frames defined in TDD LTE (long term evolution) Release-8. The invention also provides a corresponding indication method as well as a method and system for realizing the relay transmission. The relay station is used in the system, thus ensuring the backward compatibility for terminals.

The invention discloses a transmission processing method of control information from a base station to a relay node. The base station bears control information from the base station to the relay node by adopting at least one mode of resource block bearing, orthogonal frequency division multiplexing (OFDM) symbol bearing and frequency resource bearing; and the relay node receives the control information from a resource block, an OFDM symbol and frequency resources and demodulates corresponding service information according to the control information. The invention also discloses a transmission processing system of control information from the base station to the relay node, provides a mapping mode of a physical downlink control channel (R-PDCCH) from the base station to the relay node link, and realizes that the relay node correctly receives the control information transmission from the base station.

The invention provides a method for designing an eight-antenna codebook based on an LTE-Advanced system, comprising the following steps: determining codon quantity of a codebook which comprises 16 codons under the condition of each order; reusing an LTE R8 four-antenna HH codebook and obtaining a pre-encoder matrix by carrying out kcronecker product on the codons in the codebook and a unitary matrix and working out an LTE-Advanced eight-antenna codebook of an even order by transmitting power of the pre-encoder matrix; and deleting a row of column vectors in the even order codons, generating a pre-encoder matrix, carrying out normalization of emitted energy on the pre-encoder matrix and obtaining an LTE-Advanced eight-antenna codebook of an odd order. The invention not only keeps LTE-Advanced backward compatibility, but also naturally inherits a plurality of excellent characters of the LTE R8 codebook by reusing the LTE R8 four-antenna HH codebook, thereby effectively reducing CQI calculation of a terminal side and complexity of codon selection and avoiding unbalance of the transmitting power.

The invention discloses a method for the interaction of terminals' carrier-information among the wireless network controllers of the multi-frequency carrier system. The information-elements of the carrier frequency, which represent the allocated frequency of the terminals, are increased in the Iur interface-information during the processes of establishing the wireless links, increasing the wireless links, re-configuring the synchronic wireless links or the physical channels, which makes the terminals of DRNC can be controlled by SRNC, so that we can take full advantage of the resources of DRNC Cell. The invention keeps the latter compatibility of single-carrier frequency wireless network controller, which makes the Iur interface of TD-SCDMA system maintain the original capacity and also obtain the capacity of the multi-frequency system.

The invention discloses a method and a device for synchronous cell maintenance of a multi-carrier communication system. The method comprises the steps: under the condition that a plurality of cell subgroups exist, when user equipment maintains a time alignment timer (TAT) only in a subgroup containing a main cell, the user equipment determines whether an auxiliary cell in a subgroups containing the auxiliary cell only in a synchronization state according to a predetermined rule or an indication of a base station. The method and the device disclosed by the invention have the advantage of solving the problems that because the user equipment maintains the TAT only in the subgroup of the main cell, the UE cannot acquire the synchronization condition of a cell in the subgroup only containing the auxiliary cell and thus is likely to carry out uplink signal transmission when the cell in the auxiliary cell subgroup is in a step-out state and a base station side cannot receive uplink signals transmitted by the cells correctly.

The invention discloses a method for realizing access layer security, user equipment, and a node. The method comprises: end-to-tend wireless link access layer security between user equipment (UE) and an initial access node is executed; and end-to-tend wireless backhaul link access layer security between the initial access node and a gateway node is executed. Signals from the UE pass through a communication path for communication between at least two wireless air interfaces and a core network; and the UE, the initial access node, and the gateway node are arranged at the communication path at least. When the communication path includes two wireless air interfaces, the UE and the initial access node carry out communication by a wireless access link; and the initial access node and the gateway node carry out communication by a wireless backhaul link. On the one hand, wireless backhaul link security is only executed in an end-to-end mode between the gateway node and the initial access node, thereby guaranteeing security of user plane data transmission in the wireless backhaul link well; and on the other hand, wireless access link security is executed in an end-to-end mode between the UE and the initial access node, so that the wireless access link transmission security can be ensured and the UE using the LTE technology does not need any modification and thus backward compatibility is guaranteed.

The invention provides a method for providing large transmission bandwidth for a long-term evolution multi-carrier system, which comprises the following steps that: a base station sends data through an aggregation frequency range of the long-term evolution multi-carrier system; a first guard band is inserted between effective transmission bandwidths of physical layers of two adjacent LTE frequency ranges to make the center of the effective transmission bandwidths of the physical layers of the LTE frequency ranges be on a channel raster; the first guard band is not available to an LTE terminal; the first guard band is available to terminals of the long-term evolution multi-carrier system, and schedules resources of the first guard band for the long-term evolution multi-carrier system only when the terminals working on the effective transmission bandwidths of the physical layers of at least two adjacent LTE frequency ranges are the terminals of the long-term evolution multi-carrier system in a predetermined time slot; and the terminals receive the data on the aggregation frequency range of the long-term evolution multi-carrier system according to the capacity per se. The method can fully use frequency resources as much as possible on the basis of ensuring backward compatibility and providing adequate frequency guard band.