37 results about "Partial frequency reuse" patented technology

The disclosed eliminating interference method comprises: BS divides local subzone into the central user and edge user according to UE signal; BS uses time slot appointed in configuration information to transmit data with both the center and edge users, wherein, the edge users of different subzone apply different time slot.

The present invention relates to a method for providing control information in a mobile communication system. More specifically, the invention relates to a method for providing control information through a network in mobile communication. The method comprises: a step for configuring the information associated with plural frequency resource groups and the power levels thereof in the control information of preset data format, wherein the plural frequency resource groups are for application of FFR (Fractional Frequency Reuse), and a step for transmitting the control information to at least one terminal.

The invention discloses an interference suppression method based on fractional frequency reuse and joint transmission in a heterogeneous network. The interference suppression method mainly solves the problems that interference exists in a heterogeneous network and edge user throughput capacity is low in the heterogeneous network. The interference suppression method includes the steps that (1) cell models are established, namely, each cell is composed of three sectors, a macro base station is arranged at the center of each cell, and two micro base stations are arranged in each sector; (2) fractional frequency reuse is used for assigning frequency resources to each base station; (3) when a new user having access to the network is a micro base station user or a central macro base station user or a macro base station non-CoMP user, a service base station of the new user provides service for the new user independently; (4) when a user having access to the network is a macro base station cooperative user, a service base station of the new user and a cooperative base station of the new user perform joint transmission on the new user. The interference suppression method effectively suppresses interference in each cell and between the adjacent cells, improves the frequency utilization rate and the throughput capacity of cell edge users, and can be used for transmission in the heterogeneous network.

The invention provides a heterogeneous cellular network which is based on a fractional frequency reuse mechanism and micro base stations therein, and a resource selection method of the micro base stations so that inter-cell same-frequency interferences can be reduced and thus network capacity is improved. The micro base stations in the heterogeneous cellular network are provided with resources which can be used by users. The resources include frequency bands and time slots. The heterogeneous cellular network is provided with a plurality of base stations which include macro base stations and the micro base stations. Each micro base station is characterized by including an information obtaining unit which obtains configuration information and load information of the micro base station and obtains configuration information and load information of adjacent base stations from the base stations which are adjacent to the micro base station, and a resource selection unit which selects part of resources from the resources according to the configuration information and load information of the micro base station and the adjacent base stations, obtained through the information obtaining unit, so as to be used by the users.

The invention discloses a method and a device for allocating frequency resources in a fractional frequency reuse (FFR) system. The method comprises the following steps of: determining the isolation of a user terminal, wherein the isolation is difference between the signal intensity of this cell received by the user terminal and the maximum signal intensity of all adjacent cells received by the user terminal; determining to allocate the first part of frequency resources or the second part of frequency resources to the user terminal according to a comparison result between the isolation of the user terminal and the set threshold, wherein the reuse coefficient of the first part of frequency resources is greater than that of the second part of frequency resources; monitoring the change of the signal quality of the user terminal; and if the change amount exceeds the set change threshold, re-determining the isolation of the user terminal and allocating the frequency resources to the user terminal according to the isolation of the user terminal. As the isolation sufficiently reflects the interference of adjacent cells suffered by the terminal, the method can allocate the frequency resources more reasonably and efficiently to achieve the aim of interference coordination.

The invention discloses a dense network capacity increasing method based on frequency division multiplexing and uplink/downlink decoupling. Interference among base stations in a dense network is relatively severe, and a user accesses different base stations while uploading and downloading data at a place with a relatively high requirement on uplink/downlink flow density. Since inter-cell interference exists for a cell edge user, reasonable user performance cannot be ensured in a heavy load scene, and the edge user throughput decreases severely. The inter-cell interference is suppressed through fractional frequency reuse methods. A fractional frequency reuse method in which a frequency reuse factor is 3 and a fractional frequency reuse method in which a frequency reuse factor is 1 are adopted respectively for the base stations, and meanwhile data transmission uplink/downlink decoupling is realized between the user and the base stations. Through skillful combination of a frequency division multiplexing method and an uplink/downlink decoupling method, the inter-cell interference is suppressed effectively, and the overall network throughput is optimized, so that the system capacity in the dense network is increased. The dense network capacity increasing method has important practical significance and a very good application prospect.

Example embodiments are directed to methods of reducing interference in a wireless communication system. In at least one example embodiment, a method includes first determining (S360), by a first transmitter having a multi - directional antenna configured to produce a plurality of beams, at least one interference level of at least one interfering beam of a plurality of beams of at least one transmitter in the communication system, second determining (S340) a transmitting beam pattern based on the interference level, the transmitting beam pattern indicating a sequence of illuminating the plurality of beams at corresponding time slots, third determining (S345) a fractional frequency reuse pattern based on the transmitting beam pattern, and transmitting data (S350) based on the transmitting beam pattern and the frequency reuse pattern.

The invention discloses an interference coordination method for an orthogonal frequency division network. The method considers fractional frequency reuse among cells in the orthogonal frequency division network under the settings of the existing three-dimensional antenna and adopts an access point to carry out joint optimization on a downward inclination angle, carrier and available power distribution strategy, so that the total throughput capacity of the cells can be maximized and a purpose of better interference coordination is realized. A simulation result shows that compared with a joint carrier power allocation strategy adopting a fixed downward inclination angle, a fractional frequency reuse scheme and the joint optimization of the downward inclination angle, carrier and available power distribution strategy, which is provided by the embodiment of the invention, are adopted to improve the throughput capacity of the cells under the coverage of the three-dimensional antenna.

The invention discloses an inter-cell interference suppression method and system with fractional frequency reuse. The method comprises the following steps: acquiring interference information of a central user; sharing the interference information with adjacent base stations, and acquiring interface resource block information; and allocating resource blocks corresponding to the interface resource block information to partial edge users. According to the inter-cell interference suppression method with the fractional frequency reuse provided by the invention, by acquiring the interference information, the information that the central user in the cell served by the base station is interfered by a resource block allocated by the adjacent base stations to the central user can be obtained; through the sharing of the interface information, the interface resource block information can be acquired, and information of a resource block which interferes with the central users of the adjacent base stations allocated to the resource block of the central user of the served cell by the base station can be acquired; and by allocating resource blocks corresponding to the interference resource block information to partial edge users, resource blocks that interfere with the central users of the adjacent base stations can be allocated to the edge user of the base station, thereby avoiding the interference between the central users of adjacent cells of the adjacent base stations.

The invention provides an emergency communication network deployment method, and an emergency communication base station. The method comprises the following steps: acquiring a frequency reuse scheme adopted by a public communication network area where an emergency communication network to be deployed is located; in case of a fractional frequency reuse deployment scheme, acquiring cell deployment information of the public communication network area where the emergency communication network to be deployed is located, and carrying out numbering of cells; acquiring area division information in the fractional frequency reuse deployment scheme for the numbered cells in the public communication network area; acquiring a frequency band division scheme and a power distribution scheme in the fractional frequency reuse deployment scheme; determining an overlapped area (or overlapped areas) of the emergency communication network to be deployed and the cells in the public communication network area according to a deployment area of the emergency communication network; and according to the overlapped area(s) of the emergency communication network to be deployed and the cells in the public communication network area, distributing a corresponding frequency band (or corresponding frequency bands) and a corresponding power value (or corresponding power values) for the deployment area of the emergency communication network.

The invention relates to a low-complexity Femtocell spectrum resource distribution method based on cognition, and belongs to the field of wireless communication. The method includes the steps that a macro cell is divided into a central region and marginal regions by a macro cell layer of a network through the fractional frequency reuse method, the whole frequency spectrum is used by the central region, and three orthogonal frequency sub-bands of the frequency spectrum are used by the marginal regions respectively; resource distribution is conducted on domestic users in a home cell in the Femtocell in the polling mechanism sequence, and the whole frequency spectrum is used for the domestic users; the Femtocell is an isolated base station, and only the interference of the users in the macro cell on the home cell needs to be considered in the resource distribution process; otherwise, the interference of users in a home cell, overlapping the home cell where the Femtocell Nj is located, on the home cell needs to be considered besides the interference of the users in the macro cell on the home cell in the resource block distribution process. The method is low in complexity, easy to operate and capable of effectively avoiding interference and improving the frequency spectrum utilization efficiency.

The present invention provides an FD-MIMO multi-cell downlink interference coordination method. A multi-cell downlink transmission system is employed, adjacent sectors of adjacent cells form a coordination area, ad each base station employs one uniform planar array antenna. The method comprises the steps of: employing a large-scale fading factor to divide center users and edge users by each base station in the coordination area; for each edge user, employing statistical channel information to perform full cooperation interference coordination or partial cooperation interference coordination; based on a partial frequency multiplexing method, dividing service frequency bands of the center users and the edge users, and calculating the transmission power of each base station for the edge users; and calculating beam forming vectors for edge users by each cell, and employing the transmission power to perform precoding transmission. The method provided by the invention employs the channel statistical information to coordinate interference between the cells, is small in the required channel information amount, simple in transmission scheme implementation, little in feedback amount, high inrobustness, low in complexity and easy to implement, effectively improves the cell edge user service quality and is suitable for various classic wireless communication systems.

The present invention discloses a partial frequency reuse-based spectrum flexible allocation method in a long term evolution (LTE) heterogeneous network. In the method, a covered macro cell is divided into a center region and an edge region divided into N regions; one sub-frequency band is allocated to a macro user in the center region, and N sub-frequency bands are allocated to a macro user in the edge region; a home base station assigns an initial value TM for a time invoking spectrum allocation information, and timing starts; whether a value TM of the timer is 0 is determined; if the value of the timer is not 0, partial frequency multiplexing algorithms based on a spectrum database are invoked; and if the value of the time is 0, it is indicated that the partial frequency multiplexing algorithms based on the spectrum database fail in running, and partial frequency multiplexing algorithms based on spectrum sensing are invoked. Through adoption of the method, inference in a cell and among cells is effectively suppressed, spectrum efficiency of each cell and throughput of the user at the cell edge are improved, base station maintenance workload and base station construction investment are reduced, and the adaptability of the base station to the environment is enhanced.

According to the LTE system soft handoff mechanism, under the condition that partial frequency reuse is used for planning cell frequency, user equipment UE achieves base station switching between cells through the soft switching mechanism. According to the invention, the UE is always connected with only one BS in the switching process; an interruption period like a hard switching mechanism does not exist, and a connection overlapping period of an existing soft switching mechanism does not exist, so that on one hand, the data transmission time delay of the UE in the switching process is reduced, on the other hand, no pressure is brought to terminal processing capacity and equipment devices, and resources are not occupied repeatedly.