CN103297986B - Networking method for intelligent adaption wireless communication networks - Google Patents

Networking method for intelligent adaption wireless communication networks Download PDF

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CN103297986B
CN103297986B CN201310230947.7A CN201310230947A CN103297986B CN 103297986 B CN103297986 B CN 103297986B CN 201310230947 A CN201310230947 A CN 201310230947A CN 103297986 B CN103297986 B CN 103297986B
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rru
radio unit
remote radio
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cloud computing
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CN103297986A (en
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彭木根
江甲沫
李�远
谢信乾
王文博
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

A networking method for intelligent adaption wireless communication networks comprises preinstalling or installing a plurality of potential remote end radio frequency increasing units which are capable of processing baseband signals in areas which have a large business volume or a large coverage area; automatically triggering an intelligent enhancement function of a cloud wireless access network of a concentration framework when a total business volume of a common remote end radio frequency unit which is managed through one potential remote end radio frequency increasing unit exceeds a preset threshold value or anyone performance index of the cloud wireless access network among the transmission quality (packet loss rate), the throughput capacity or the end-to-end transmission delay reduces to be smaller than a preset threshold value due to limitation of a real-time processing function of the cloud wireless access network; and triggering compression processing function of wireless signals and adapting to a bandwidth requirement of a limited optical backhaul link when the optical backhaul link transmission volume from the radio frequency increasing units to a cloud computing server exceeds the threshold value. According to the networking method for the intelligent adaption wireless communication networks, intelligent adaption of the network environment and user action dynamic changes is achieved and the network energy consumption is reduced based on the fact that concentrated control is retained.

Description

A kind of network-building method of cordless communication network of intelligent adaptation
Technical field
The present invention relates to a kind of network-building method of cordless communication network of intelligent adaptation, belong to the technical field that the network design in wireless communication system, networking plan and network service manage.
Background technology
In order to meet the demand that mobile multimedia packet data traffic increases severely, improving system spectral efficiency, guaranteeing QoS of customer, reducing energy ezpenditure and operator's cost, need the novel framework and technology that propose mobile radio networks badly.Meanwhile, the data volume of mobile Internet business rapidly rises, and for building, run and the expenditure of upgrading wireless Access Network also constantly increases thereupon, but income but increases slowly.In order to keep continuing profit and the long-term growth of business, mobile operator must find low cost for user provides the method for radio communication service.Increasing concern has been subjected in the cloud radio communication access network that it is possible to meet very well above requirement.
See Fig. 1, the structure composition of the cloud Radio Access Network of existing two level frameworks is described: this network composition comprises common remote radio unit (RRU), light back haul link and cloud computing server.Wherein the cloudy regions of top represents the cloud computing server realizing resource and data centralization management and control, for focusing on the data message of wireless access end in cloud wireless access networking, and carries out centralized management to resource allocation conditions.The coverage that theres is provided of the common remote radio unit (RRU) of ellipticity region representation of below, these common remote radio unit (RRU)s are used for the wireless signal of transmitting/receiving wireless incoming end, are directly connected with cloud computing server by light back haul link.In the networking plan and the network architecture of Fig. 1, all common remote radio unit (RRU)s are all directly be connected with cloud computing server by light back haul link, transmit data by light back haul link between remote radio unit (RRU) and cloud computing server.All base band signal process and resource management and control function all concentrate on cloud computing server.At wireless access end, the common remote radio unit (RRU) disposing some provides service for the user in network and ensures the covering performance of user.
Therefore, cloud Radio Access Network is mainly made up of remote radio unit (RRU), light back haul link and cloud computing server.For cloud radio communication access network, by arranging that large-scale remote radio unit (RRU) can realize the seamless coverage of cellular network, and the physical resource centralized arrangement of multiple traditional base station at cloud computing server, so that the information of carrying out focuses on together; So both significantly can reduce the base station number covering same region, thus realize green networking, also be convenient to the utilization of communication for coordination technology, improve spectrum efficiency to reduce inter base station interference, be more convenient for utilizing cloud computing technology to focus on mass data and realizing the intelligent networking of dynamic realtime.Meanwhile, pond, the base station Intel Virtualization Technology based on real-time cloud computing architecture can reduce construction and the O&M cost of the network architecture, shared processing resources, reduces energy resource consumption, improves infrastructure utilance.Thus meet the networking requirements of high spectrum effect, high energy efficiency, intelligent adaptation and the low cost of new generation broadband wireless mobile communication network system.
The traffic carrying capacity that the mobile radio system that faces the future increases severely and data processing operation, cloud radio communication access network major part calculates and signal transacting is all complete at the cloud computing server based on real-time cloud computing architecture.So, adopt centralized network architecture, can guarantee that whole cloud radio communication access network is concentrated controlled.And under centralized network architecture, by the virtual multiplexing distribution according to need realized Radio Resource and process resource of resource, more efficient and the utilization of resources more flexibly can be realized.
In the ideal case, the virtual multiplex technique of resource calculated based on real-time cloud can resource in dynamic assignment cloud computing server, improves disposal ability.In a word, the introducing of real-time cloud computing architecture, makes the multiple resources in cordless communication network obtain the utilization of global optimization, effectively can solve problem of resource waste.
But the application scale of centerized fusion can be restricted completely, when scale requirements is larger, can not the dynamic change of adaptive channel environment and user behavior etc., be unfavorable for obtaining radio link adaptation performance gain.This is due in practical wireless communication systems, the complete centralized architecture of existing conventional cloud cordless communication network and network-building method, fully can not meet the mobility etc. of the time varying channel characteristic sum user of the adaptive wireless access end of dynamic realtime.Because become when wireless transmission channel is dynamic, user behavior attribute is also complicated and changeable, and load of base station situation also can change (i.e. tidal effect) in time, these factors all cause the high in the clouds of geo-stationary in cloud radio communication Access Network can not the dynamically changeable wireless access end of adapted in real time, thus the global optimum causing centralized processing can not realize resource utilizes.And, also can increase the expense of back haul link, expand the undesirable property of wireless access links channel, thus worsen the performance of cloud radio communication access network.This just needs the approach first proposing solution from the network-building method of cloud radio communication access network.
In sum, for cloud radio communication access network, meeting, centralized network architecture is unified to be optimized and concentrates on controlled basis, how by the network-building method of intelligent adaptation, the dynamic change of the adaptive wireless communication channel circumstance of incoming end, network state, user behavior and traffic performance, realize the dynamic optimization of network performance, reduce signaling consumption and reduce management cost, just become the focus that scientific research personnel in the industry pays close attention to.
Summary of the invention
In view of this, the object of this invention is to provide a kind of network-building method of cordless communication network of intelligent adaptation, the method requires or business load state according to network size, by carrying out function upgrading to segment distal radio frequency unit, make segment distal radio frequency unit can carry out necessary base band signal process, to improve the dynamically suitable change ability of cloud cordless communication network at incoming end, also network is changed into the tertiary structure of intelligence by two-layer configuration simultaneously, achieve the intelligent adaptation networking of cloud radio communication access network, elevator system performance.
In order to reach foregoing invention object, the invention provides a kind of network-building method of cordless communication network of intelligent adaptation, it is characterized in that: in or region that coverage is large large in traffic carrying capacity, to pre-set or extension can carry out the potential enhancing remote radio unit (RRU) of base band signal process; When the total traffic of the common remote radio unit (RRU) finding potential enhancing remote radio unit (RRU) management exceedes default threshold value, or cloud Radio Access Network due to real-time processing capacity limited, make its transmission quality, i.e. packet loss, when any one performance index in the delay performance of throughput or end-to-end transmission are reduced to and are less than its predetermined threshold, the intelligence all automatically triggering the cloud Radio Access Network of centralized architecture strengthens function; Further, when strengthening the transmission capacity of radio frequency unit to the light back haul link of cloud computing server and exceeding threshold value, the compression processing capacity of wireless signal is triggered, to adapt to the bandwidth requirement of limited light back haul link; Described method comprises following operative step:
Step 1, according to the network planning, first arranges the basic covering that common remote radio unit (RRU) realizes business, and all base band signal process and Radio Resource management and control function is all concentrated on cloud computing server; Simultaneously, the region large in traffic carrying capacity or coverage is large, pre-set or set up multiple potential enhancing remote radio unit (RRU) that can carry out base band signal process, these potential enhancing remote radio unit (RRU)s by optical fiber and multiple common remote radio unit (RRU) interconnected, and be respectively equipped with the interactive interface of business and control information separately; And these common remote radio unit (RRU)s are by potential enhancing remote radio unit (RRU) access cloud computing server;
Step 2, every setting cycle T1, potential enhancing remote radio unit (RRU) judges whether the total traffic of its common remote radio unit (RRU) managed continues to exceed predetermined threshold value C1, or cloud Radio Access Network is limited owing to processing in real time, its transmission quality, i.e. packet loss, throughput or end-to-end transmission time Yanzhong any one performance index be reduced to and be less than its predetermined threshold R1 itime, the intelligence of the cloud Radio Access Network of automatic triggering centralized architecture strengthens function, the potential enhancing remote radio unit (RRU) namely pre-setting or set up adopts the method for software download, automatically download baseband signal processing module from cloud computing server, make it be converted to enhancing remote radio unit (RRU); Described predetermined threshold value R1 iin, natural number sequence number i is 1,2,3; Therefore R1 i, i.e. R1 1, R1 2and R1 3be respectively packet loss, the predetermined threshold of throughput or end-to-end propagation delay time;
Step 3, strengthens remote radio unit (RRU) and the base band signal process of coupled all common remote radio unit (RRU) is all concentrated on himself, and wireless signal is performed to the cooperation transmission process comprising cooperation precoding, decoding, channel decoding and modulation /demodulation; And corresponding Radio Resource management and control function still concentrates on cloud computing server;
Step 4, strengthen remote radio unit (RRU) and judge whether the transmission capacity of light back haul link between itself and cloud computing server exceedes setting threshold value D1 every setting cycle T2, if so, wireless signal compression processing capacity is just triggered, to adapt to limited light back haul link bandwidth requirement; If not, then remain stationary constant;
Step 5, strengthen remote radio unit (RRU) cycle monitoring and judge whether the total traffic of its common remote radio unit (RRU) managed is less than predetermined threshold value C2 continuously, simultaneously, judge the transmission quality of cloud Radio Access Network, i.e. packet loss, the time delay of throughput or end-to-end transmission totally three performance index whether all higher than its predetermined threshold value R2 i; If these two judged results meet simultaneously, then this enhancing remote radio unit (RRU) is just converted to potential enhancing remote radio unit (RRU), and the signal transacting of the common remote radio unit (RRU) managed transfers to cloud computing server to focus on again; Described predetermined threshold value R2 iin, natural number sequence number i is 1,2,3; Therefore R2 i, i.e. R2 1, R2 2and R2 3be respectively packet loss, another predetermined threshold of throughput or end-to-end propagation delay time.
Compared with prior art, the innovation key technology of the inventive method and beneficial effect are:
According to demands such as network size requirement or business load states, at the potential enhancing remote radio unit (RRU) (this network element improves realization by carrying out function upgrading to common remote radio unit (RRU)) that particular locality pre-sets or sets up, thus extend the function of common remote radio unit (RRU), make reinforced partly remote radio unit (RRU) can carry out necessary base band signal process, improve the dynamically suitable change ability of cloud wireless network at incoming end, network configuration is also changed into the tertiary structure of intelligence by two-layer configuration.
And, owing to adding enhancing remote radio unit (RRU), the cloud computing server in cloud Radio Access Network is made to retain on concentrated controlled feature basis, can the network state change of intelligent adaptation wireless access end and complicated user behavior dynamic change, for the realization of cloud computing server real-time cloud computing capability provides effective way.Thus to solve in cloud Radio Access Network centerized fusion completely preferably can not the technical problem of the dynamic change such as adaptive channel environment and user behavior, obtain radio link adaptation performance gain.
Moreover, because each network element device and travelling carriage still adopt the principle of centralized management and design, the optimization that can realize global network performance is controlled, intelligence simultaneously by automatically triggering cloud Radio Access Network centralized architecture strengthens, reduce network system energy ezpenditure, and control and the accessing cost for data reduced on light back haul link, the computation complexity of intelligent adaptation cloud computing server and resource utilization, promote the performance of cloud Radio Access Network.
Finally, the method is little to the change of existing network framework and network element, and computation complexity is also low, and the power consumption that remote radio unit (RRU) increases is not obvious, and operating procedure is simple, convenient, easily realize, and the design of the network architecture is convenient.
In sum, the inventive method is conducive to solving the challenge and requirement that in following cloud Radio Access Network, real-time cloud calculates, and has and well applies scene.
Accompanying drawing explanation
Fig. 1 is the structure composition schematic diagram of the cloud Radio Access Network under existing two-level network structure.
Fig. 2 is the structure composition schematic diagram of the cloud Radio Access Network of intelligent adaptation of the present invention.
Fig. 3 is the network-building method operating procedure flow chart of the cloud Radio Access Network of intelligent adaptation of the present invention.
Fig. 4 strengthens remote radio unit (RRU) structure composition schematic diagram in the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
See Fig. 2, what the network-building method introducing the cordless communication network of intelligent adaptation of the present invention proposed forms in the structure of the cloud Radio Access Network strengthening the three-level structure on remote radio unit (RRU) basis:
This network architecture is except retaining original common remote radio unit (RRU), light back haul link, beyond cloud computing server, also comprise new network element device: strengthen remote radio unit (RRU), and strengthen the connecting fiber between remote radio unit (RRU) and common remote radio unit (RRU).Wherein, cloudy regions is still for realizing the cloud computing server of resource and data centralization management and control, and ellipticity region is the coverage jointly provided with enhancing remote radio unit (RRU) by common remote radio unit (RRU) or common remote radio unit (RRU).This enhancing remote radio unit (RRU) (comprising potential enhancing remote radio unit (RRU)) for it is managed, the cooperation transmission process that realized wireless signal by the common remote radio unit (RRU) of Fiber connection, and be connected with cloud computing server by light back haul link, transmit the data message of cooperation transmission base band signal process.
In networking plan of the present invention and the network architecture, for the region only disposing common remote radio unit (RRU), common remote radio unit (RRU) or directly passing through light back haul link is connected with cloud computing server.And deploying common remote radio unit (RRU) and the region strengthening radio frequency unit, common remote radio unit (RRU) by the enhancing remote radio unit (RRU) in this region of Fiber connection, then is connected to cloud computing server by this enhancing remote radio unit (RRU).Now, all resource management and control functions still concentrate on cloud computing server and realize, but, strengthening the region of remote radio unit (RRU) control, the cooperation transmission baseband signal of its common remote radio unit (RRU) controlled is by this enhancing remote radio unit (RRU) process, further, when on the light back haul link that enhancing remote radio unit (RRU) is connected with cloud computing server, data exceed threshold value, with regard to log-on data compression process.
The network-building method of the cordless communication network of intelligent adaptation of the present invention is: in or region that coverage is large large in traffic carrying capacity, pre-sets or extension can carry out the potential enhancing remote radio unit (RRU) of base band signal process; When the total traffic of the common remote radio unit (RRU) finding potential enhancing remote radio unit (RRU) management exceedes default threshold value, or cloud Radio Access Network due to real-time processing capacity limited, make its transmission quality, i.e. packet loss, when any one performance index in the delay performance of throughput or end-to-end transmission are reduced to and are less than its predetermined threshold, the intelligence all automatically triggering the cloud Radio Access Network of centralized architecture strengthens function; Further, when strengthening the transmission capacity of radio frequency unit to the light back haul link of cloud computing server and exceeding threshold value, the compression processing capacity of wireless signal is triggered, to adapt to the bandwidth requirement of limited light back haul link.
See Fig. 3, introduce the following concrete operation step of network-building method of the present invention:
Step 1, according to the network planning, first arranges the basic covering that common remote radio unit (RRU) realizes business, and all base band signal process and Radio Resource management and control function is all concentrated on cloud computing server; Simultaneously, the region large in traffic carrying capacity or coverage is large, pre-set or set up multiple potential enhancing remote radio unit (RRU) that can carry out base band signal process, these potential enhancing remote radio unit (RRU)s by optical fiber and multiple common remote radio unit (RRU) interconnected, and be respectively equipped with the interactive interface of business and control information separately; And these common remote radio unit (RRU)s are by potential enhancing remote radio unit (RRU) access cloud computing server.
This step 1 comprises following content of operation:
(11) needing to dispose in the gamut of cloud Radio Access Network, according to traffic carrying capacity size and the footprint size thereof in the network planning and each region, common remote radio unit (RRU) is set and configures corresponding frequency spectrum resource and basic parameter, for this cloud Radio Access Network provides the basic covering of business.
(12) or region that coverage large large in traffic carrying capacity, pre-set or set up multiple potential enhancing remote radio unit (RRU) that can carry out base band signal process, common remote radio unit (RRU) in this region is interconnected by optical fiber and potential enhancing remote radio unit (RRU), and by these potential enhancing remote radio unit (RRU)s access cloud computing server; Common remote radio unit (RRU) in the region that all the other traffic carrying capacitys are little or coverage is little directly accesses cloud computing server by optical fiber.
Step 2, every setting cycle T1, potential enhancing remote radio unit (RRU) judges whether the total traffic of its common remote radio unit (RRU) managed continues to exceed predetermined threshold value C1, or cloud Radio Access Network is limited owing to processing in real time, its transmission quality, i.e. packet loss, throughput or end-to-end transmission time Yanzhong any one performance index be reduced to and be less than its predetermined threshold R1 itime, the intelligence of the cloud Radio Access Network of automatic triggering centralized architecture strengthens function, the potential enhancing remote radio unit (RRU) namely pre-setting or set up adopts the method for software download, automatically download baseband signal processing module from cloud computing server, make it be converted to enhancing remote radio unit (RRU); In formula, natural number sequence number i is 1,2,3, R1 ibe respectively packet loss, the predetermined threshold of throughput or end-to-end propagation delay time.This step 2 comprises following content of operation:
(21) the potential change of enhancing remote radio unit (RRU) traffic needs in setting cycle is to network and the performance of cloud Radio Access Network are monitored, when finding that the total traffic of the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) manages continues to exceed predetermined threshold value C1 in setting cycle T1, or cloud Radio Access Network is limited owing to processing in real time, its transmission quality, i.e. packet loss, throughput or end-to-end transmission time Yanzhong any one performance parameter be reduced to and be less than its predetermined threshold R1 itime, the intelligence automatically triggering the cloud Radio Access Network of centralized architecture strengthens function;
(22) to pre-set or the potential enhancing remote radio unit (RRU) set up passes through method for downloading software, automatically download from cloud computing server and comprise the relevant parameter of joint transmission and cooperative beam figuration technology and the baseband signal processing module of algorithm, make it be converted to enhancing remote radio unit (RRU); Now, this enhancing remote radio unit (RRU) forms the node cluster set of cooperative multipoint transmission together with its multiple common remote radio unit (RRU) managed.
See Fig. 4, structure composition the present invention being strengthened to remote radio unit (RRU) is described: except comprising original parts of common remote radio unit (RRU): be responsible for the fiber interface module that the framing of common public radio interface data, solution frame and Clock Extraction are synchronous,
Complete Digital Up Convert, Digital Down Convert, crest factor decay and the data intermediate frequency module of digital predistortion function, complete the radio-frequency (RF) transceiver module of analog-to-digital conversion, rf modulations demodulation and filter and amplification function, the power amplifier LNA module of the power amplification completing radio frequency transmissions and the low noise amplification function receiving small-signal, and beyond the front end filter module completing out of band signal inhibit feature
Also have additional between fiber interface module and data intermediate frequency module: cooperation transmission baseband signal processing module, and the fiber interface module to be connected with this cooperation transmission baseband signal processing module, the common remote radio unit (RRU) that this fiber interface module is managed by light back haul link and this enhancing remote radio unit (RRU) is connected.
This cooperation transmission baseband signal processing module function is: when traffic carrying capacity increases and network performance declines, respective wireless signal processing module is downloaded from cloud computing server, to make potential enhancing remote radio unit (RRU) be converted to enhancing remote radio unit (RRU), its common remote radio unit (RRU) managed is performed to the signal transacting of cooperation transmission; And and between data intermediate frequency module, be mutually transferred through the data message of collaborative process.
The function of the fiber interface module of the common remote radio unit (RRU) that the connection of setting up manages is: for receiving the data message of common remote radio unit (RRU), to carry out the base band signal process of cooperation transmission, be also responsible for sending the management information of cooperation transmission and the centralized management information of Radio Resource.
The function strengthening original fiber interface module in remote radio unit (RRU) is: be responsible for connecting cloud computing server, for passing through the data message after the process of cooperation transmission baseband signal processing module to cloud computing server, and receive the centralized management information of cloud computing server to Radio Resource.
Step 3, strengthens remote radio unit (RRU) and the base band signal process of coupled all common remote radio unit (RRU) is all concentrated on himself, and wireless signal is performed to the cooperation transmission process comprising cooperation precoding, decoding, channel decoding and modulation /demodulation; And corresponding Radio Resource management and control function still concentrates on cloud computing server.
Step 4, strengthen remote radio unit (RRU) and judge whether the transmission capacity of light back haul link between itself and cloud computing server exceedes setting threshold value D1 every setting cycle T2, if so, wireless signal compression processing capacity is just triggered, to adapt to limited light back haul link bandwidth requirement; If not, then remain stationary constant.
This step 4 comprises following content of operation:
(41) remote radio unit (RRU) is strengthened in the information interaction periodicity T2 of itself and cloud computing server, whether the transmission capacity detecting light back haul link between this enhancing remote radio unit (RRU) to cloud computing server exceedes higher limit D1, if not, then remain stationary constant; If so, then trigger corresponding wireless signal compression process, namely perform subsequent step (42), to adapt to limited light back haul link bandwidth requirement.
(42) strengthening remote radio unit (RRU) adopts I/Q data (namely combining by I road solid part signal and the Q road imaginary signals the baseband digital signal formed) compress technique optimized to trigger wireless signal compression process: the remote radio unit (RRU) of enhancing is in units of the chip of predetermined quantity, the I/Q data of the common remote radio unit (RRU) obtained is compressed according to the compressibility factor of this I/Q data, and the I/Q data after compression is carried out framing according to the isl frame form of high speed interface protocol; Then, then by the data after framing via Optical Fiber Transmission to cloud computing server.
Step 5, strengthen remote radio unit (RRU) cycle monitoring and judge whether the total traffic of its common remote radio unit (RRU) managed is less than predetermined threshold value C2 continuously, simultaneously, judge the transmission quality of cloud Radio Access Network, i.e. packet loss, the time delay of throughput or end-to-end transmission totally three performance index whether all higher than its predetermined threshold R2 i; If these two judged results meet simultaneously, then this enhancing remote radio unit (RRU) is just converted to potential enhancing remote radio unit (RRU), and the signal transacting of the common remote radio unit (RRU) managed transfers to cloud computing server to focus on again; In formula, R2 ibe respectively packet loss, another predetermined threshold of throughput or end-to-end propagation delay time.This step 5 comprises following content of operation:
(51) the remote radio unit (RRU) change of traffic needs and performance of cloud Radio Access Network in setting cycle T3 Sampling network is strengthened, when it finds that the total traffic of the common remote radio unit (RRU) that this enhancing remote radio unit (RRU) manages is less than predetermined threshold value C2 continuously in stipulated time T1, and the transmission quality of cloud Radio Access Network, i.e. packet loss, throughput or end-to-end transmission time Yanzhong three performance index all higher than its predetermined threshold R2 itime, just automatically trigger the intelligent adaptation function of the cloud Radio Access Network of centralized architecture;
(52) enhancing remote radio unit (RRU) recovers it automatically becomes potential enhancing remote radio unit (RRU), and the signal processing function of the common remote radio unit (RRU) managed transfers to cloud computing server to focus on again.

Claims (8)

1. a network-building method for the cordless communication network of intelligent adaptation, is characterized in that: in or region that coverage is large large in traffic carrying capacity, pre-sets or extension can carry out the potential enhancing remote radio unit (RRU) of base band signal process; When the total traffic of the common remote radio unit (RRU) finding potential enhancing remote radio unit (RRU) management exceedes default threshold value, or cloud Radio Access Network due to real-time processing capacity limited, make its transmission quality, i.e. packet loss, when any one performance index in the delay performance of throughput or end-to-end transmission are reduced to and are less than its predetermined threshold, the intelligence all automatically triggering the cloud Radio Access Network of centralized architecture strengthens function; Further, when strengthening the transmission capacity of radio frequency unit to the light back haul link of cloud computing server and exceeding threshold value, the compression processing capacity of wireless signal is triggered, to adapt to the bandwidth requirement of limited light back haul link; Described method comprises following operative step:
Step 1, according to the network planning, first arranges the basic covering that common remote radio unit (RRU) realizes business, and all base band signal process and Radio Resource management and control function is all concentrated on cloud computing server; Simultaneously, the region large in traffic carrying capacity or coverage is large, pre-set or set up multiple potential enhancing remote radio unit (RRU) that can carry out base band signal process, these potential enhancing remote radio unit (RRU)s by optical fiber and multiple common remote radio unit (RRU) interconnected, and be respectively equipped with the interactive interface of business and control information separately; And these common remote radio unit (RRU)s are by potential enhancing remote radio unit (RRU) access cloud computing server;
Step 2, every setting cycle T1, potential enhancing remote radio unit (RRU) judges whether the total traffic of its common remote radio unit (RRU) managed continues to exceed predetermined threshold value C1, or cloud Radio Access Network is limited owing to processing in real time, its transmission quality, i.e. packet loss, throughput or end-to-end transmission time Yanzhong any one performance index be reduced to and be less than its predetermined threshold R1 itime, the intelligence of the cloud Radio Access Network of automatic triggering centralized architecture strengthens function, the potential enhancing remote radio unit (RRU) namely pre-setting or set up adopts the method for software download, automatically download baseband signal processing module from cloud computing server, make it be converted to enhancing remote radio unit (RRU); Described predetermined threshold value R1 iin, natural number sequence number i is 1,2,3; Therefore R1 i, i.e. R1 1, R1 2and R1 3be respectively packet loss, the predetermined threshold of throughput or end-to-end propagation delay time;
Step 3, strengthens remote radio unit (RRU) and the base band signal process of coupled all common remote radio unit (RRU) is all concentrated on himself, and wireless signal is performed to the cooperation transmission process comprising cooperation precoding, decoding, channel decoding and modulation /demodulation; And corresponding Radio Resource management and control function still concentrates on cloud computing server;
Step 4, strengthen remote radio unit (RRU) and judge whether the transmission capacity of light back haul link between itself and cloud computing server exceedes setting threshold value D1 every setting cycle T2, if so, wireless signal compression processing capacity is just triggered, to adapt to limited light back haul link bandwidth requirement; If not, then remain stationary constant;
Step 5, strengthen remote radio unit (RRU) cycle monitoring and judge whether the total traffic of its common remote radio unit (RRU) managed is less than predetermined threshold value C2 continuously, simultaneously, judge the transmission quality of cloud Radio Access Network, i.e. packet loss, the time delay of throughput or end-to-end transmission totally three performance index whether all higher than its predetermined threshold value R2 i; If these two judged results meet simultaneously, then this enhancing remote radio unit (RRU) is just converted to potential enhancing remote radio unit (RRU), and the signal transacting of the common remote radio unit (RRU) managed transfers to cloud computing server to focus on again; Described predetermined threshold value R2 iin, natural number sequence number i is 1,2,3; Therefore R2 i, i.e. R2 1, R2 2and R2 3be respectively packet loss, another predetermined threshold of throughput or end-to-end propagation delay time.
2. method according to claim 1, is characterized in that: in described network-building method, relates to following network node unit:
Cloud computing server, for focusing on the data message of wireless access end in cloud wireless access networking, and carries out centralized management to resource allocation conditions;
Light back haul link, for transfer data information between remote radio unit (RRU) and cloud computing server;
Common remote radio unit (RRU), for realizing the wireless signal transmitting-receiving of wireless access end, not arranging in the region strengthening remote radio unit (RRU), is directly connected with cloud computing server by light back haul link; Arranging in the region strengthening remote radio unit (RRU), by Fiber connection to the remote radio unit (RRU) strengthened;
Strengthen remote radio unit (RRU), comprise potential enhancing remote radio unit (RRU), for it is managed, the cooperation transmission process that realized wireless signal by the common remote radio unit (RRU) of Fiber connection, and be connected with cloud computing server by light back haul link, transmit the data message of cooperation transmission base band signal process.
3. method according to claim 1, is characterized in that, described step 1 comprises following content of operation:
(11) needing to dispose in the gamut of cloud Radio Access Network, according to traffic carrying capacity size and the footprint size thereof in the network planning and each region, common remote radio unit (RRU) is set and configures corresponding frequency spectrum resource and basic parameter, for this cloud Radio Access Network provides the basic covering of business;
(12) or region that coverage large large in traffic carrying capacity, pre-set or set up multiple potential enhancing remote radio unit (RRU) that can carry out base band signal process, common remote radio unit (RRU) in this region is interconnected by optical fiber and potential enhancing remote radio unit (RRU), and by these potential enhancing remote radio unit (RRU)s access cloud computing server; Common remote radio unit (RRU) in the region that all the other traffic carrying capacitys are little or coverage is little directly accesses cloud computing server by optical fiber.
4. method according to claim 1, is characterized in that, described step 2 comprises following content of operation:
(21) the potential change of enhancing remote radio unit (RRU) traffic needs in setting cycle is to network and the performance of cloud Radio Access Network are monitored, when finding that the total traffic of the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) manages continues to exceed predetermined threshold value C1 in setting cycle T1, or cloud Radio Access Network is limited owing to processing in real time, its transmission quality, i.e. packet loss, throughput or end-to-end transmission time Yanzhong any one performance parameter be reduced to and be less than its predetermined threshold R1 itime, the intelligence automatically triggering the cloud Radio Access Network of centralized architecture strengthens function;
(22) to pre-set or the potential enhancing remote radio unit (RRU) set up passes through method for downloading software, automatically download from cloud computing server and comprise the relevant parameter of joint transmission and cooperative beam figuration technology and the baseband signal processing module of algorithm, make it be converted to enhancing remote radio unit (RRU); Now, this enhancing remote radio unit (RRU) forms the node cluster set of cooperative multipoint transmission together with its multiple common remote radio unit (RRU) managed.
5. method according to claim 4, it is characterized in that: the structure composition of described enhancing remote radio unit (RRU), except comprising original parts of common remote radio unit (RRU): the framing being responsible for common public radio interface data, separate frame and the synchronous fiber interface module of Clock Extraction, complete Digital Up Convert, Digital Down Convert, the data intermediate frequency module of crest factor decay and digital predistortion function, complete analog-to-digital conversion, the radio-frequency (RF) transceiver module of rf modulations demodulation and filter and amplification function, the power amplifier LNA module of the power amplification completing radio frequency transmissions and the low noise amplification function receiving small-signal, and beyond the front end filter module completing out of band signal inhibit feature, the fiber interface module also set up cooperation transmission baseband signal processing module and be connected with this cooperation transmission baseband signal processing module between fiber interface module with data intermediate frequency module, the common remote radio unit (RRU) that this fiber interface module is managed by light back haul link and this enhancing remote radio unit (RRU) is connected.
6. method according to claim 5, it is characterized in that: described cooperation transmission baseband signal processing module function is when traffic carrying capacity increases and network performance declines, respective wireless signal processing module is downloaded from cloud computing server, to make potential enhancing remote radio unit (RRU) be converted to enhancing remote radio unit (RRU), its common remote radio unit (RRU) managed is performed to the signal transacting of cooperation transmission; And and between data intermediate frequency module, be mutually transferred through the data message of collaborative process; The fiber interface module of the common remote radio unit (RRU) that described connection of setting up manages is for receiving the data message of common remote radio unit (RRU), to carry out the base band signal process of cooperation transmission, be also responsible for sending the management information of cooperation transmission and the centralized management information of Radio Resource; Described original fiber interface module then connects cloud computing server, for passing through the data message after the process of cooperation transmission baseband signal processing module to cloud computing server, and receives the centralized management information of cloud computing server to Radio Resource.
7. method according to claim 1, is characterized in that, described step 4 comprises following content of operation:
(41) remote radio unit (RRU) is strengthened in the information interaction periodicity T2 of itself and cloud computing server, whether the transmission capacity detecting light back haul link between this enhancing remote radio unit (RRU) to cloud computing server exceedes higher limit D1, if not, then remain stationary constant; If so, then trigger corresponding wireless signal compression process, namely perform subsequent step (42), to adapt to limited light back haul link bandwidth requirement;
(42) strengthening remote radio unit (RRU) adopts the I/Q data compress technique optimized to trigger wireless signal compression process: the remote radio unit (RRU) of enhancing is in units of the chip of predetermined quantity, the I/Q data of the common remote radio unit (RRU) obtained is compressed according to the compressibility factor of this I/Q data, and the I/Q data after compression is carried out framing according to the isl frame form of high speed interface protocol; Then, then by the data after framing via Optical Fiber Transmission to cloud computing server; Described I/Q data combines by I road solid part signal and Q road imaginary signals the baseband digital signal formed.
8. method according to claim 1, is characterized in that, described step 5 comprises following content of operation:
(51) the remote radio unit (RRU) change of traffic needs and performance of cloud Radio Access Network in setting cycle T3 Sampling network is strengthened, when it finds that the total traffic of the common remote radio unit (RRU) that this enhancing remote radio unit (RRU) manages is less than predetermined threshold value C2 continuously in stipulated time T1, and the transmission quality of cloud Radio Access Network, i.e. packet loss, throughput or end-to-end transmission time Yanzhong three performance index all higher than its predetermined threshold R2 itime, just automatically trigger the intelligent adaptation function of the cloud Radio Access Network of centralized architecture;
(52) enhancing remote radio unit (RRU) recovers it automatically becomes potential enhancing remote radio unit (RRU), and the signal processing function of the common remote radio unit (RRU) managed transfers to cloud computing server to focus on again.
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