71 results about "C-RAN" patented technology

The embodiment of the invention discloses a centralized base-band processing unit (CBPU), which comprises a switching module, at least one base-band unit (BBU) and a resource mapping module, wherein the resource mapping module is used for performing resource block de-mapping on an uplink frequency domain base-band signal obtained by fast Fourier transform (FFT), and separating a signal of each user from a corresponding sub-carrier; the switching module is used for transmitting the signal of each user to a corresponding BBU; and the BBU is used for processing the received signal of the user. Correspondingly, the embodiment of the invention also discloses a remote radio frequency unit (RRU) and a frequency domain transmission method. By the technical scheme, the transmission performance of a cloud radio access network (C-RAN) system can be improved.

The present invention relates to a method for a terminal to perform a handover in a cloud radio access network (C-RAN), including the steps of: receiving information on at least one candidate remote radio head (RRH); measuring the strength of received signals from at least one candidate RRH and a serving cell for the terminal; and, when the strength of the received signals from the candidate RRH and the serving cell of the terminal satisfy a predetermined relationship according to the measured result, transmitting feedback information, including the measured result, to the candidate RRH.

The invention discloses a C-RAN calculation unloading and resource allocation method based on deep reinforcement learning in the technical field of mobile communication. The method comprises the following steps: 1) firstly constructing a deep reinforcement learning neural network; calculating a task data size and calculation resources required for executing a task; 2) inputting the system state into a deep reinforcement learning model; performing neural network training, and obtaining system actions, 3) enabling the user to unload the calculation task according to the unloading proportionalitycoefficient; enabling the mobile edge computing server to execute a computing task according to the computing resource allocation coefficient; obtaining a reward value of the system action accordingto the reward function; updating neural network parameters according to the reward value; and 4) repeating the above steps until the reward value tends to be stable, completing the training process, and unloading the user computing task and allocating the computing resources of the MEC server according to the final system action. The method can greatly reduce the user service time and energy consumption, so that the real-time low-energy-consumption service becomes possible.

The invention discloses a method and a device for resource scheduling and control based on C-RAN. The method comprises steps that a BBU (Base Band Unit) pool periodically sends a short pulse sequence in a wavelength dedicated control channel for activating an RRU (Remote Radio Unit); after the BBU pool activates the RRU, synchronization information and system information are broadcasted to an air interface, so that a user terminal is enabled to obtain the synchronization information and the system information, thereby enabling the user terminal and a district corresponding to the BBU to achieve downlink synchronization; further, the user terminal is enabled to establish connection and achieve uplink synchronization with the district through the random access process after achieving downlink synchronization with the district; after the user terminal achieves downlink synchronization and uplink synchronization with the district, the BBU pool allocates wireless bandwidth resources to the user terminal according to a buffer state report (BSR) sent by the user terminal in a scheduling period; and the BBU pool allocates optical wavelength bandwidth resources to the RRU according to the sum of all bandwidth requests of the user terminals corresponding to the RRU. The device is used for achieving the method.

The invention relates to a network slice virtual resource distribution method under a virtualized C-RAN network and belongs to the technical field of communication. Under the premise that average delay constraint of all network slices and network average backhaul link bandwidth consumption constraint are met, the method perform dynamic resource distribution with the maximum average network slice and speed as targets. The distributed resources include spectrum resources (resource blocks) and buffer resources. On each resource schedule time slot, an integrated resource management system can distribute the appropriate amount of resource blocks and buffer materials for each network slice according to a current system state. The virtual resource distribution method disclosed by the invention can improve network slice and speed and simultaneously can ensure service quality of all the slices.

The invention provides an improved C-RAN network architecture and a resource dispatching method. The method comprises the following steps of receiving user request information through a remote wireless unit, and sending the request information to a baseband processing unit; receiving the request information through the baseband processing unit, and sending the request information to a controller; calculating the load size required by the request through the controller, and comparing the load size with a load threshold value of a local baseband processing unit; if the required load is larger than the load threshold value of the local baseband processing unit, mapping a user request to other baseband processing units in a baseband processing pond so as to carry out resource processing through the local baseband processing unit according to a dispatching mechanism. Through the method, the problem of resource dispatching between the baseband processing units in the communication field can be effectively solved.

The invention relates to a wireless communication system and provides a method for eliminating cell-edge user interference of a multi-cell system under C-RAN architecture. Currently, under the cloud wireless access network (C-RAN) architecture, a remote base station can share channel edge information in a baseband pool. Aiming at the problems in applying massive MIMO to an FDD system and in applying the joint spatial division and multiplexing (JSDM) technology to multiple cells, the invention provides a JSDM scheme applied to multiple cells under the cloud wireless access network architecture and a design of a first-order pre-coding matrix with relatively low complexity, thereby reducing the expenses for downlink pilot frequency sequence training and eliminating inter-cell interference and also inter-user interference by a zero-forcing (ZF) method. Theoretical analysis and simulation results indicate that the scheme of the invention contributes to decrease of the complexity of the first-order pre-coding matrix and increase of the overall speed of the multi-cell system.

The invention discloses a virtual machine dispatching mechanism for JT-CoMP (Joint Transmission-Coordinated Multiple Points) in a C-RAN (Centralized-Radio Access Network) framework. The virtual machine dispatching mechanism specifically comprises: (1) centralizing calculation tasks of cell edge users into a virtual baseband pool; (2) classifying protocol function modules of all users by a module classifier with a range method; (3) configuring three VMs (virtual machines) for a system, wherein each VM has a very large request queue; (4) dispatching the modules to the corresponding VMs for execution by a module dispatcher according to module classification information; (5) calculating resource information and time information by a local manager according to a dispatching scheme and feeding back the information to a global manager; and (6) adjusting a mapping scheme by the global manager according to different heuristic algorithms until an optimal scheme is obtained. The VM dispatching mechanism is suitable for solving the VM dispatching problem of a JT-CoMP scene in the C-RAN framework, and can effectively realize synchronization between cooperative RRUs (Radio Remote Units) and ensure task execution fairness among the users.

The invention discloses an energy saving method of a BBU (Base Band Unit) pool under a C-RAN (Cloud Radio Access Network) architecture, and belongs to the field of mobile communication. The energy saving method comprises the particular steps of: firstly, establishing a system model of users, RRHs (Remote Radio Heads) and the BBU pool; acquiring rates of transmitting the RRHs connected with a certain specific BBU to the users and a pre-coding matrix; calculating a transmission power usage rate rho trans and a traffic usage rate rho traff; then calculating a resource usage rate rho BBU of the specific BBU, and setting a kernel variable; pre-defining an upper limit and a lower limit of the resource usage rates of the BBUs, and defining four types of the BBUs; calculating the resource usage rates of all the BBUs in the BBU pool, carrying out partitioning according to four types and carrying out statistics on the numbers of various types; and finally, according to the kernel variables and the type numbers of all the BBUs in the BBU pool, carrying out switching among the BBUs to achieve energy saving. The energy saving method has the advantages that the resource usage rate of the specific BBU can be calculated and states of the BBUs can be dynamically switched; in the case of not influencing QoS of the users, one part of active BBUs in the BBU pool are closed and are enabled to enter a sleep state so as to save energy consumption.

The invention discloses a method for dynamically configuring a computing resource and a data link in a C-RAN network based on an SDN, and relates to the technical field of wireless access networks. The method comprises the following steps: splitting a physical layer and a media access control sub-layer of a virtual base station communication function in a BBU resource pool, respectively realizing on a virtual machine, managing virtual base stations of all data centers by use of a SDN controller, thereby building a virtual cluster between the virtual base stations, and performing data link allocation for the virtual cluster to provide cooperation and communication with higher degree between the base stations, thereby dynamically configuring the computing resource and dynamically adjusting the data link of the virtual cluster. By sufficient use of the virtualization of the computing resource in the C-RAN network based on the SDN, the computing resource is dynamically allocated and the data link is dynamically adjusted, the BBU resource pool utilization rate is improved, the user handover delay is reduced, and better user experience effect is realized.

In one embodiment, a cloud radio access network (C-RAN) includes a first plurality of antennas and a first plurality of radio remote units (RRUs) coupled to the plurality of antennas. The C-RAN also includes a first plurality of broadband base units (BBUs) and a first photonic switch optically coupled between the first plurality of RRUs and the first plurality of BBUs.

The invention discloses a system and method of realizing C-RAN load balance on the basis of household base stations. The load balance system comprises a load detection module, an information processing module, a switching decision module and a switching execution module. The switching decision module confirms a wireless access network switching order set according to overload neighborhood information list provided by the load detection module and a usable household base station information list provided by the information processing module. The switching execution module executes switching according to the wireless access network order set provided by the switching decision module so as to enable mobile users in an overload neighborhood to be switched to an adjacent household base station. Consequently, load balance of the C-RAN wireless access network is realized, and meanwhile network sources of leisure household base stations are utilized reasonably.

The invention provides a data transmission method for a C-RAN (C-Radio Access Network) architecture massive MIMO (Multi-Input Multi-Output) system based on compressed sensing. The method comprises the following steps: a centralized baseband processing unit (BBU) vectorizes a channel matrix H obtained by channel estimation to obtain a channel vector h; the BBU carries out random measurement using the channel vector h to obtain a measurement vector y in a compressed sensing model; the BBU sends the measurement vector y and a data symbol vector s to each remote radio unit (RRU); the RRU obtains a channel matrix reconstruction signal H^ according to the received measurement vector y and a compressed sensing algorithm; the RRU calculates a pre-coding matrix W using the channel matrix H^; and the RRU carries out pre-coding using the pre-coding matrix W and the data symbol vector s, and calculates a sending signal vector x. According to the method, channel state information is compressed by adopting a compressed sensing method, reconstructed and then pre-coded, so that the capacity of the system is greatly improved under the condition that the transmission bandwidth between the BBU and the RRU is limited.

A method and apparatus for transmitting a channel information report message in a cloud radio access network (C-RAN) environment are disclosed. A method for transmitting a channel information report message by a user equipment (UE) under a cloud radio access network (C-RAN) environment includes: receiving a reference signal (RS) including a reference signal (RS) configuration indicator from a specific base station (BS) contained in a UE-oriented virtual cell formed by the UE; measuring channel information regarding each of one or more base stations (BSs) contained in the UE-oriented virtual cell on the basis of the RS configuration indicator; and transmitting a channel information report message including the measured channel information to the specific base station (BS), wherein the RS configuration indicator includes one or more RS resources used for channel information measurement, and the one or more RS resources are allocated to one or more base stations (BSs) contained in the UE-oriented virtual cell.

The invention discloses a wireless access network system based on a C-RAN. The wireless access network system based on the C-RAN comprises a base station room and multiple planning sites respectively arranged in different outdoor places, wherein multiple baseband processing units and one room multiplexer/demultiplexer are arranged in the base station room, and each baseband processing unit is connected to the multiplexer/demultiplexer through one room optical wavelength converter and one room optical switch. Each planning site comprises a site multiplexer/demultiplexer and a remote radio unit, wherein the remote radio unit is sequentially connected to the site multiplexer/demultiplexer through one site optical wavelength converter and one site optical coupler. The room multiplexer/demultiplexer is connected with the site multiplexer/demultiplexer through main and standby line optical fibers. When all or one of the main and standby line optical fibers breaks, lines are switched through the room optical switch. The wireless access network system adopts optical couplers at remote radio site receiving terminals, the complexity of outdoor design is effectively simplified, the system stability is improved, accordingly the risk is reduced, and the protection switching requirement is met.

The embodiment of the invention discloses an access method and device for an RRU and relates to the field of wireless communication. The access method and device are used for solving the problem that in the prior art, the RRU can not get access under a C-RAN infrastructure. First RRU identification is distributed to the RRU through an optical switching device, access request information which is sent by the RRU and carries the first RRU identification is intercepted through the optical switching device and forwarded to a control device, the control device can transmit an optical interface number, on the side of the optical switching device, of the RRU to a BBU distributed to the RRU through the process that the BBU is distributed to the RRU, and the optical switching device is instructed to perform optical interface internal interconnection, and then the BBU can distribute second RRU identification to the RRU according to the optical interface number, wherein the second RRU identification is used for getting access to the BBU. The problem that the RRU can not get access under the C-RAN infrastructure is solved.

The invention discloses an uplink interference suppression technique in a C-RAN architecture radio access network, which relates to a radio access network system. According to the correlation between the received signals of all RRUs (remote radio unit), the reference symbols in the signals transmitted by mobile terminals Ue (User equipment) are extracted and stored into an information array, the conditions and quality of the channels between the Ues and the peripheral RRUs are estimated according to the information array, and are stored into an array, and a base band resource pool carries out interference elimination on each received signal, suppressing the uplink interference of mobile subscribers in the system. The invention takes full advantage of the centralized processing of the C-RAN architecture-based radio access network to thoroughly eliminate the signal interference between systems.

A method and an apparatus for designing a cloud based radio access network, C-RAN, are provided. The solution comprises dividing (302) the access network into two or more tiers having different processing capabilities; receiving as an input information about the physical location of one or more remote radio heads, RRH, of the network and required quality of service of the remote radio heads; and determining (306) the physical location of the tier, BBU, having most efficient processing capability for serving the remote radio heads on the basis of the information about the location and required quality of service of at least part of the one or more remote radio heads.