71 results about "C-RAN" patented technology

The invention discloses a network system for providing mobile edge computing service and a service method thereof, so as to solve the technical problem of flexible deployment of MEC on a mobile communication network. In the C-RAN architecture, an SDN-based MEC controller is deployed, and an MEC server is deployed in the BBU. The service implementation step mainly comprises the following steps: setting a decision threshold; judging whether the time delay is sensitive or not and the like to determine a computing mode by an MEC controller; and giving a computing result through four computing modes of computing of a local MEC server, combination computing of a plurality of MEC servers, computing of a specific non-local MEC server and computing of a cloud center; and finishing all user MEC tasks through repeated executions. According to the method, the MEC service is realized; meanwhile, the remaining computational resources in the BBU can be sufficiently used, and the MEC network hierarchyis more concise, so that the management is facilitated, the data transmission efficiency is improved, the pressure of a core network is relieved, and the overall computing task time delay is reduced.The method can be used for flexible deployment of the MEC on the mobile communication network in the present 4G period, the 4G to 5G transition period and the 5G period.

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.

System and method embodiments are provided to optimize uplink multiple-input-multiple-output (MIMO) beamforming for uplink and compression for fronthaul links transmission in cloud radio access network (C-RANs). In an embodiment, cloud-computing based central processor (CP) obtains channel state information for a mobile device (MD) being served by a plurality of access points (APs) in a C-RAN, and generates a channel gain matrix in accordance with the channel state information. A weighted sum-rate maximization model is then established using the channel gain matrix in accordance with power constraints of transmission from the MD to the APs and capacity constraints of fronthaul links connecting the APs to the CP. The CP calculates a transmit beamforming vector for the MD and a quantization noise covariance matrix for the APs jointly by applying a weighted minimum-mean-square-error successive convex approximation algorithm, or separately by applying an approximation algorithm, to solve the weighted sum-rate maximization model.

A method is proposed of arranging, in a mobile communication network, transmission of data between user equipment and at least one base station including a central unit and at least one remote unit associated therewith. The method includes at a transmitting side including the remote unit or the central unit, quantizing the data according to a quantization bit number, and transmitting, over a fronthaul link between the transmitting side and a receiving side including the central unit or the remote unit, respectively, the quantized data to the receiving side. The method further includes, at the central unit: determining the quantization bit number, wherein the determining including varying in time the quantization bit number according to network information available at the central unit, and communicating to the at least one remote unit the determined quantization bit number.

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 discloses an associated task scheduling mechanism based on CoMP synchronization constraint in a C-RAN framework. The associated task scheduling mechanism specially comprises the following steps: (1) selecting an appropriate cooperative RRU set according to a present network condition through a cell edge user; (2) predicting the system load of a next moment according to the load change situation of the system at a present moment and a previous moment through a load prediction module; (3) classifying user tasks according to QoS attribute through a task management module; (4) implementing cluster division and differentiation arrangement on virtual resources of a virtue base band pool according to the task amount and the task classification information through a VM management module; (5) reasonably scheduling associated tasks of parallel signals of the user according to the task classification information and the virtual resource allocation information through a task scheduling module. The associated task scheduling mechanism is applicable to synchronization constraint of parallel signals based on cooperative multi-point transmission (CoMP) in the C-RAN framework, and associated task scheduling with different quality of service (QoS) requirements.

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 scheduling method of hardware accelerators in a C-RAN. The method comprises the following steps of 1) establishing a task queue work_queue in a virtual machine controller Dom0, and simultaneously, aiming at each hardware accelerator, establishing a task queue write_queue and a task queue read_queue; 2) after the virtual machine controller Dom0 receives a request of a virtual machine DomU, adding the request in the task queue work_queue according to a first-come-first-served policy; 3) successively taking out tasks in the task queue work_queue, selecting the hardware accelerator with a current minimum load, and putting the task which is taken out into the corresponding task queue to complete a scheduling design of the plurality of hardware accelerators so that a virtual machine shares the accelerators. A signal processing speed is increased, hardware accelerator loads are balanced and a system throughput is increased.

The invention relates to a C-RAN system simulation platform. The simulation platform mainly includes a core simulation engine layer, a C-RAN network simulation layer and a user layer. The core insulation engine layer is a disperse event management framework in the whole simulation process and is used for arranging and processing disperse events and propelling a simulation clock; the C-RAN network simulation layer is abstracted into a specific module according to characteristics of sub layers of a C-RAN core network and is mainly used for simulating physical resources, network topology and virtual management of a C-RAN framework; the user layer is used for application feature variable setting and simulation result output. A user can build a C-RAN communication network according to specific application requirements, carry out repeated testing and optimization according to algorithms of different modules in communication, references are provided for building of an actual C-RAN network, and convenience is brought to development.

The invention discloses an energy saving power control method of a wireless network based on C-RAN architecture. According to the method, RRH transmission power consumption and BBU processing energy consumption are taken into comprehensive consideration; the relation features among the RRH transmission power consumption, the BBU processing energy consumption and an RRH transmitting power are utilized; the power adjusting iterations are reduced in adoption of a criterion of preferentially adjusting the RRH with the maximum access user average signal to interference plus noise ratio; and the total energy consumption of the network is reduced as much as possible.

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.

A method and apparatus for performing tracking area update (TAU) by a user equipment (UE) in a C-RAN system is disclosed. The method for performing a tracking area update (TAU) by a user equipment (UB) in a Cloud Radio Access Network (C-RAN) includes: transmitting a message, that includes a tracking area update (TAU) indicator indicating a tracking area update (TAU), to a serving Remote Radio Head (S-RRH), wherein the tracking area update (TAU) is performed in units of a Remote Radio Head (RRH) cluster.

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.

An embodiment of the invention discloses a method and device for internet protocol (IP) address configuration and relates to the field of wireless communication. The method and the device are used for solving the problem of confliction of IP addresses of every board card connected to base bands in a base band pool under a C-RAN framework in the prior art. Virtual machine frame numbers are distributed for every BBU which is to be connected to the base band pool, the virtual machine frame numbers distributed for every BBU can uniquely identify the BBU in the base band pool, the IP addresses are distributed for every board card in the BBU according to the virtual machine frame numbers distributed for the BBU, uniqueness of the IP addresses in the base band pool is guaranteed, and accordingly the problem of confliction of the IP addresses of the board cards in the base band pool under the C-RAN framework 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.

The invention provides a method for detecting the energy consumption of an LTE wireless private network based on a C-RAN architecture. The method comprises the following steps that an energy consumption module of equipment to be detected of an LTE wireless private network system is established according to the C-RAN architecture; in operation of the equipment to be detected, the energy consumption value of the energy consumption part of digital baseband processing of the equipment to be detected, the energy consumption value of the energy consumption part of a simulation radio frequency unit, the energy consumption value of the energy consumption part of a power amplifying module and the energy consumption value of the energy consumption part of system environment are calculated; the total energy consumption value of the LTE wireless private network system is determined according to the calculated energy consumption values. The method achieves the accurate calculation of the system energy consumption, the energy consumption of each part corresponds to an entity physical unit carrier, when the system structure of a signal processing algorithm is changed, the caused energy consumption change can also be precisely detected in real time, and important reference is provided for energy consumption detection and control of the LTE wireless private network.

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.

The invention discloses a C-RAN user association and computing resource allocation method based on deep reinforcement learning. The method comprises the following steps of 1) establishing a deep reinforcement learning neural network, and combining a signal to interference ratio (SINR) state of the neural network, a computing resource state in a baseband unit (BBU) pool and a far-end radio frequency head (RRH) cache state into a system state as input of the neural network; and 2) training the neural network according to the input system state to obtain neural network output, namely system action. and 3) using the C-RAN to perform the user association and computing resource allocation in the BBU pool according to the system action, and obtain a reward value under the system action and the system state at the next moment according to the reward function and the state transition matrix; and 4) inputting the reward value and the next system state into the neural network, repeating the abovesteps until the reward value tends to be stable so as to complete the training process, and carrying out user association and computing resource allocation in the BBU pool according to the final system action, thereby greatly reducing the service time delay, improving the service quality, and enabling the real-time service to be possible.