CN103297986A - Networking method for intelligent adaption wireless communication networks - Google Patents
Networking method for intelligent adaption wireless communication networks Download PDFInfo
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- CN103297986A CN103297986A CN2013102309477A CN201310230947A CN103297986A CN 103297986 A CN103297986 A CN 103297986A CN 2013102309477 A CN2013102309477 A CN 2013102309477A CN 201310230947 A CN201310230947 A CN 201310230947A CN 103297986 A CN103297986 A CN 103297986A
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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
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 of network design, networking plan and network service management in the wireless communication system.
Background technology
In order to satisfy the demand that the mobile multimedia packet data traffic increases severely, improve system spectral efficiency, guarantee QoS of customer, reduce energy consumption and operator's cost, need the novel framework and the technology that propose mobile radio networks badly.Meanwhile, the data volume of mobile Internet business rapidly rises, and the expenditure that is used for construction, operation and upgrading wireless Access Network also constantly increases thereupon, yet income but increases slowly.In order to keep continuing profit and professional long-term growth, mobile operator must seek the low-cost method that radio communication service is provided for the user.So, can finely satisfy the above cloud radio communication access network that requires and be subjected to increasing concern.
Referring to Fig. 1, the structure of the cloud Radio Access Network of existing two level frameworks formed describe: this network is formed and is comprised common remote radio unit (RRU), light back haul link and cloud computing server.Wherein the cloud form region representation of top is realized the cloud computing server of resource and data centralization management and control, is used for focusing on the data message of cloud wireless access networking wireless access end, and resource allocation conditions is concentrated management and control.The coverage that the common remote radio unit (RRU) of ellipticity region representation of below provides, these common remote radio unit (RRU)s are used for the wireless signal of transmitting/receiving wireless incoming end, directly are connected with cloud computing server by the light back haul link.In the networking plan and the network architecture of Fig. 1, all common remote radio unit (RRU)s all are directly to link to each other with cloud computing server by the light back haul link, by light back haul link Data transmission 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 the wireless access end, the common remote radio unit (RRU) of disposing some provides service and assurance user's covering performance for the user in the network.
Therefore, the cloud Radio Access Network mainly is made up of remote radio unit (RRU), light back haul link and cloud computing server.For cloud radio communication access network, can realize the seamless covering of cellular network by arranging large-scale remote radio unit (RRU), and the physical resource centralized arrangement of a plurality of traditional base stations at cloud computing server, so that the information of carrying out focuses on together; So both can significantly reduce the base station number that covers same zone, thereby 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 the cloud computing technology to focus on the intelligent networking of mass data and realization dynamic real-time.Simultaneously, can reduce construction and the O﹠M cost of the network architecture based on pond, the base station Intel Virtualization Technology of real-time cloud computing framework, shared processing resources reduces energy resource consumption, improves the infrastructure utilance.Thereby satisfy high spectrum effect, high energy efficiency, intelligent adaptation and the networking demand cheaply of new generation broadband wireless mobile communication network system.
Traffic carrying capacity and data processing operation that the mobile radio system that faces the future increases severely, it all is to finish based on the cloud computing server of real-time cloud computing framework that the most of calculating of cloud radio communication access network and signal are handled.So, adopt centralized network architecture, can guarantee that whole cloud radio communication access network is concentrated controlled.And under centralized network architecture, can realize the more efficient and utilization of resources more flexibly to the distribution according to need of Radio Resource and processing resource by virtual multiplexing realization of resource.
In the ideal case, based on the resource of the virtual multiplex technique of the resource of real-time cloud computing in can the dynamic assignment cloud computing server, improve disposal ability.In a word, the introducing of cloud computing framework in real time makes the multiple resource in the cordless communication network obtain the utilization of global optimization, can solve wasting of resources problem effectively.
But the application scale of centralized control completely can be restricted, and requires when big in scale, can not the adaptive channel environment and the dynamic change of user behavior etc., be unfavorable for obtaining the radio link adaptation performance gain.This is because in practical wireless communication systems, complete centralized architecture and the network-building method of existing traditional cloud cordless communication network can not fully satisfy the time varying channel feature of the adaptive wireless access end of dynamic real-time and user's mobility etc.Because become when wireless transmission channel is dynamic, the user behavior attribute also is complicated and changeable, and the base station loading condition also can change (being tidal effect) in time, these factors all cause high in the clouds static relatively in the cloud radio communication Access Network can not be in real time adaptive dynamic changeable wireless access end, thereby cause centralized processing can not realize that the global optimum of resource utilizes.And, also can increase the expense of back haul link, enlarge the undesirable property of wireless access links channel, thereby worsen the performance of cloud radio communication access network.This just needs at first to propose from the network-building method of cloud radio communication access network the approach of solution.
In sum, for cloud radio communication access network, satisfying the unified optimization of centralized network architecture and concentrating on the controlled basis, the network-building method by intelligent adaptation how, the dynamic change of channel circumstance, network state, user behavior and the traffic performance of adaptive wireless communication incoming end, realize the dynamic optimization of network performance, reduce signaling consumption and reduce management cost, just become the focus of scientific research personnel's concern in the industry.
Summary of the invention
In view of this, the network-building method that the purpose of this invention is to provide a kind of cordless communication network of intelligent adaptation, this method is to require or the business load state according to network size, by the segment distal radio frequency unit is carried out function upgrading, make the segment distal radio frequency unit can carry out necessary base band signal process, to improve the cloud cordless communication network in the dynamically suitable change ability of incoming end, also network is changed into the tertiary structure of intelligence simultaneously by two-layer configuration, realized the intelligent adaptation networking of cloud radio communication access network, the elevator system performance.
In order to reach the foregoing invention purpose, the invention provides a kind of network-building method of cordless communication network of intelligent adaptation, it is characterized in that: in or the zone that coverage is big big in traffic carrying capacity, set in advance or extension can carry out the potential enhancing remote radio unit (RRU) of base band signal process; When the total traffic of finding the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) is managed surpasses default threshold value, perhaps the cloud Radio Access Network is because processing capacity is limited in real time, make its transmission quality, be packet loss, when any one performance index in the delay performance of throughput or end-to-end transmission were reduced to less than its predetermined threshold, the intelligence that all triggers the cloud Radio Access Network of centralized architecture automatically strengthened function; And when strengthening the transmission capacity of radio frequency unit to the light back haul link of cloud computing server and surpass threshold value, the compression processing capacity of triggering wireless signal is to adapt to the bandwidth requirement of limited light back haul link; Described method comprises following operating procedure:
Step 1 according to the network planning, arranges common remote radio unit (RRU) earlier and realizes professional basic covering, and all base band signal process and Radio Resource management and control function are all concentrated on cloud computing server; Simultaneously, the zone big in traffic carrying capacity or coverage is big, set in advance or set up a plurality of potential enhancing remote radio unit (RRU)s that can carry out base band signal process, these potential enhancing remote radio unit (RRU)s are interconnected by optical fiber and a plurality of common remote radio unit (RRU), and are respectively equipped with the interactive interface of professional and control information separately; And these common remote radio unit (RRU)s insert cloud computing server by potential enhancing remote radio unit (RRU);
Step 2, potential enhancing remote radio unit (RRU) judges every setting cycle T1 whether the total traffic of the common remote radio unit (RRU) of its management surpasses predetermined threshold value C1 continuously, perhaps the cloud Radio Access Network is owing to handle limited in real time, its transmission quality, be packet loss, throughput or end-to-end transmission the time Yanzhong any one performance index be reduced to less than its predetermined threshold R1
iThe time, automatically the intelligence that triggers the cloud Radio Access Network of centralized architecture strengthens function, the method that the potential enhancing remote radio unit (RRU) that just sets in advance or set up adopts software to download, automatically download baseband signal processing module from cloud computing server, make it be converted to the enhancing remote radio unit (RRU); In the 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;
Step 3 strengthens remote radio unit (RRU) the base band signal process of all coupled common remote radio unit (RRU)s is all concentrated on himself, and wireless signal is carried out the cooperation transmission that comprises cooperation precoding, decoding, channel decoding and modulation handle; And corresponding Radio Resource management and control function still concentrates on cloud computing server;
Step 4, strengthening remote radio unit (RRU) judges every setting cycle T2 whether the transmission capacity of light back haul link surpasses between itself and the cloud computing server and sets threshold value D1, if just trigger wireless signal compression processing capacity, to adapt to limited light back haul link bandwidth requirement; If not, then remain stationary constant;
Step 5, strengthen the remote radio unit (RRU) cycle monitoring and judge whether the total traffic of the common remote radio unit (RRU) of its management is less than predetermined threshold value C2 continuously, simultaneously, judge the cloud Radio Access Network transmission quality, be packet loss, whether totally three performance index of the time delay of throughput or end-to-end transmission all is higher than its predetermined threshold R2
iIf these two judged results satisfy simultaneously, then this enhancing remote radio unit (RRU) just is converted to potential enhancing remote radio unit (RRU), and cloud computing server is transferred in the signal processing of the common remote radio unit (RRU) of its management is again focused on; In the formula, R2
iBe respectively packet loss, another predetermined threshold of throughput or end-to-end propagation delay time.
Compared with prior art, innovation key technology and the beneficial effect of the inventive method are:
According to demands such as network size requirement or business load states, the potential enhancing remote radio unit (RRU) that sets in advance or set up in particular locality (this network element by common remote radio unit (RRU) is carried out function upgrading improve realize), thereby expanded the function of common remote radio unit (RRU), feasible part strengthens remote radio unit (RRU) can carry out necessary base band signal process, improved 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 increased the enhancing remote radio unit (RRU), make the cloud computing server in the cloud Radio Access Network keep on the concentrated controlled characteristics basis, network state that can intelligent adaptation wireless access end changes and complicated user behavior dynamic change, for the realization of the real-time cloud computing ability of cloud computing server provides effective way.Can not the adaptive channel environment and the technical problem of dynamic change such as user behavior thereby solved centralized control completely in the cloud Radio Access Network preferably, obtain the radio link adaptation performance gain.
Moreover, still adopt the principle of centralized management and design because of each network element device and travelling carriage, can realize that the global network optimization in Properties is controlled, strengthen by the intelligence that triggers cloud Radio Access Network centralized architecture automatically simultaneously, reduce the consumption of network system energy, and the accessing cost for data on control and the minimizing light back haul link, the computation complexity of intelligent adaptation cloud computing server and resource utilization, the performance of lifting cloud Radio Access Network.
At last, this method to the change of existing network framework and network element seldom, computation complexity is also low, the power consumption that remote radio unit (RRU) increases is not obvious, operating procedure is simple, convenient, realize that easily the design of the network architecture is convenient.
In sum, the inventive method is conducive to solve challenge and the requirement of cloud computing in real time in the following cloud Radio Access Network, has the excellent popularization application scenarios.
Description of drawings
Fig. 1 is that the structure of the cloud Radio Access Network under the existing two-level network structure is formed schematic diagram.
Fig. 2 is that the structure of the cloud Radio Access Network of intelligent adaptation of the present invention is formed schematic diagram.
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 the remote radio unit (RRU) structure to form schematic diagram among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 2, introduce the structure at the cloud Radio Access Network that strengthens the three-level structure on the remote radio unit (RRU) basis that the network-building method of the cordless communication network of intelligent adaptation of the present invention proposes and form:
This network architecture is except keeping original common remote radio unit (RRU), the light back haul link, beyond the cloud computing server, also comprise new network element device: strengthen remote radio unit (RRU), and at the optical fiber that is connected that strengthens between remote radio unit (RRU) and the common remote radio unit (RRU).Wherein, the cloud form zone still is the cloud computing server of realization resource and data centralization management and control, and the ellipticity zone is by common remote radio unit (RRU) or common remote radio unit (RRU) and strengthens the coverage that remote radio unit (RRU) provides jointly.Common remote radio unit (RRU) that this enhancing remote radio unit (RRU) (comprising potential enhancing remote radio unit (RRU)) is used for it is managed, that connect by optical fiber realizes that the cooperation transmission of wireless signal handles, and be connected with cloud computing server by the 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 zone of only disposing common remote radio unit (RRU), common remote radio unit (RRU) still directly links to each other with cloud computing server by the light back haul link.And disposing common remote radio unit (RRU) and the zone that strengthens radio frequency unit, common remote radio unit (RRU) connects the enhancing remote radio unit (RRU) in this zone by optical fiber, is connected to cloud computing server by this enhancing remote radio unit (RRU) again.At this moment, all resource management and control functions still concentrate on cloud computing server and realize, but, in the zone that strengthens remote radio unit (RRU) control, the cooperation transmission baseband signal of the common remote radio unit (RRU) of its control strengthens remote radio unit (RRU) by this and handles, and when data surpassed threshold value on the light back haul link that the enhancing remote radio unit (RRU) links to each other with cloud computing server, compression was handled with regard to log-on data.
The network-building method of the cordless communication network of intelligent adaptation of the present invention is: in or the zone that coverage is big big in traffic carrying capacity, set in advance or extension can carry out the potential enhancing remote radio unit (RRU) of base band signal process; When the total traffic of finding the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) is managed surpasses default threshold value, perhaps the cloud Radio Access Network is because processing capacity is limited in real time, make its transmission quality, be packet loss, when any one performance index in the delay performance of throughput or end-to-end transmission were reduced to less than its predetermined threshold, the intelligence that all triggers the cloud Radio Access Network of centralized architecture automatically strengthened function; And when strengthening the transmission capacity of radio frequency unit to the light back haul link of cloud computing server and surpass threshold value, the compression processing capacity of triggering wireless signal is to adapt to the bandwidth requirement of limited light back haul link.
Referring to Fig. 3, introduce the following concrete operations step of network-building method of the present invention:
Step 1 according to the network planning, arranges common remote radio unit (RRU) earlier and realizes professional basic covering, and all base band signal process and Radio Resource management and control function are all concentrated on cloud computing server; Simultaneously, the zone big in traffic carrying capacity or coverage is big, set in advance or set up a plurality of potential enhancing remote radio unit (RRU)s that can carry out base band signal process, these potential enhancing remote radio unit (RRU)s are interconnected by optical fiber and a plurality of common remote radio unit (RRU), and are respectively equipped with the interactive interface of professional and control information separately; And these common remote radio unit (RRU)s insert cloud computing server by potential enhancing remote radio unit (RRU).
This step 1 comprises following content of operation:
(11) dispose in the gamut of cloud Radio Access Network at needs, according to the network planning and each regional traffic carrying capacity size and footprint size thereof, common remote radio unit (RRU) and the corresponding frequency spectrum resource of configuration and basic parameter are set, for this cloud Radio Access Network provides professional basic covering.
(12) or zone that coverage big big in traffic carrying capacity, set in advance or set up a plurality of potential enhancing remote radio unit (RRU)s that can carry out base band signal process, common remote radio unit (RRU) in this zone is by optical fiber and the interconnection of potential enhancing remote radio unit (RRU), and inserts cloud computing server by these potential enhancing remote radio unit (RRU)s; Common remote radio unit (RRU) in the zone that all the other traffic carrying capacitys are little or coverage is little directly inserts cloud computing server by optical fiber.
Step 2, potential enhancing remote radio unit (RRU) judges every setting cycle T1 whether the total traffic of the common remote radio unit (RRU) of its management surpasses predetermined threshold value C1 continuously, perhaps the cloud Radio Access Network is owing to handle limited in real time, its transmission quality, be packet loss, throughput or end-to-end transmission the time Yanzhong any one performance index be reduced to less than its predetermined threshold R1
iThe time, automatically the intelligence that triggers the cloud Radio Access Network of centralized architecture strengthens function, the method that the potential enhancing remote radio unit (RRU) that just sets in advance or set up adopts software to download, automatically download baseband signal processing module from cloud computing server, make it be converted to the enhancing remote radio unit (RRU); In the 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) potential enhancing remote radio unit (RRU) every setting cycle to network in the variation of traffic needs and the performance of cloud Radio Access Network monitor, when the total traffic of finding the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) is managed surpasses predetermined threshold value C1 continuously in setting cycle T1, perhaps the cloud Radio Access Network is owing to handle limited in real time, its transmission quality, be packet loss, throughput or end-to-end transmission the time Yanzhong any one performance parameter be reduced to less than its predetermined threshold R1
iThe time, the intelligence that triggers the cloud Radio Access Network of centralized architecture automatically strengthens function;
(22) the potential enhancing remote radio unit (RRU) that sets in advance or set up passes through method for downloading software, automatically comprise joint transmission and the relevant parameter of cooperative beam figuration technology and the baseband signal processing module of algorithm from the cloud computing server download, make it be converted to the enhancing remote radio unit (RRU); At this moment, this enhancing remote radio unit (RRU) is gathered with the node cluster that its a plurality of common remote radio unit (RRU) of managing constitutes cooperative multipoint transmission.
Referring to Fig. 4, the structure composition that the present invention is strengthened remote radio unit (RRU) describes: except comprising original parts of common remote radio unit (RRU): be responsible for framing, solution frame and the synchronous fiber interface module of Clock Extraction of common public radio interface data,
Finish the digital intermediate frequency module of Digital Up Convert, Digital Down Convert, crest factor decay and digital predistortion function, finish the radio-frequency (RF) transceiver module of analog-to-digital conversion, rf modulations demodulation and filtering enlarging function, finish the power amplification of radio frequency transmissions and the power amplifier LNA module of the low noise enlarging function that receives small-signal, and finish beyond the front end filter module of out of band signal inhibit feature
Also between fiber interface module and digital intermediate frequency module, have additional: the cooperation transmission baseband signal processing module, and the fiber interface module that is 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 increase and network performance decline, download the respective wireless signal processing module from cloud computing server, so that potential enhancing remote radio unit (RRU) is converted to the enhancing remote radio unit (RRU), the signal that its common remote radio unit (RRU) of managing is carried out cooperation transmission is handled; And and the digital intermediate frequency module between mutually transmission 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 is managed is: the data message that is used for receiving common remote radio unit (RRU), in order to carry out the base band signal process of cooperation transmission, also be responsible for sending the management information of cooperation transmission and the concentrated management and control information of Radio Resource.
The function that strengthens original fiber interface module in the remote radio unit (RRU) is: be responsible for connecting cloud computing server, for the data message after handling through the cooperation transmission baseband signal processing module to the cloud computing server transmission, and receive cloud computing server to the concentrated management and control information of Radio Resource.
Step 3 strengthens remote radio unit (RRU) the base band signal process of all coupled common remote radio unit (RRU)s is all concentrated on himself, and wireless signal is carried out the cooperation transmission that comprises cooperation precoding, decoding, channel decoding and modulation handle; And corresponding Radio Resource management and control function still concentrates on cloud computing server.
Step 4, strengthening remote radio unit (RRU) judges every setting cycle T2 whether the transmission capacity of light back haul link surpasses between itself and the cloud computing server and sets threshold value D1, if just trigger wireless signal compression processing capacity, 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) strengthen remote radio unit (RRU) its with the information interaction periodicity T2 of cloud computing server in, detect this enhancing remote radio unit (RRU) to the transmission capacity of light back haul link between the cloud computing server whether above higher limit D1, if not, it is constant then to remain stationary; If then trigger corresponding wireless signal compression and handle, namely carry out subsequent step (42), to adapt to limited light back haul link bandwidth requirement.
(42) strengthening remote radio unit (RRU) adopts IQ data (i.e. the baseband digital signal that is constituted by I road solid part signal and Q road imaginary signals) the compress technique triggering wireless signal compression of optimizing to handle: the remote radio unit (RRU) of enhancing is unit with the chip of predetermined quantity, the IQ data of the common remote radio unit (RRU) that obtains are compressed according to the compressibility factor of these IQ data, and the IQ data after will compressing are carried out framing according to the isl frame form of high-speed interface agreement; Then, give cloud computing server with the data behind the framing via Optical Fiber Transmission again.
Step 5, strengthen the remote radio unit (RRU) cycle monitoring and judge whether the total traffic of the common remote radio unit (RRU) of its management is less than predetermined threshold value C2 continuously, simultaneously, judge the cloud Radio Access Network transmission quality, be packet loss, whether totally three performance index of the time delay of throughput or end-to-end transmission all is higher than its predetermined threshold R2
iIf these two judged results satisfy simultaneously, then this enhancing remote radio unit (RRU) just is converted to potential enhancing remote radio unit (RRU), and cloud computing server is transferred in the signal processing of the common remote radio unit (RRU) of its management is again focused on; In the 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) strengthen remote radio unit (RRU) and detect the variation of traffic needs in the network and the performance of cloud Radio Access Network every setting cycle T3, when its total traffic of finding the common remote radio unit (RRU) of this enhancing remote radio unit (RRU) management is less than predetermined threshold value C2 in the T1 at the appointed time continuously, and the transmission quality of cloud Radio Access Network, be packet loss, throughput or end-to-end transmission the time Yanzhong three performance index all be higher than its predetermined threshold R2
iThe time, just trigger the intelligent adaptation function of the cloud Radio Access Network of centralized architecture automatically;
(52) strengthen remote radio unit (RRU) and recover it automatically and become potential enhancing remote radio unit (RRU), and the signal processing function of the common remote radio unit (RRU) of its management is transferred to cloud computing server again focus on.
Claims (8)
1. the network-building method of the cordless communication network of an intelligent adaptation is characterized in that: in or the zone that coverage is big big in traffic carrying capacity, set in advance or extension can carry out the potential enhancing remote radio unit (RRU) of base band signal process; When the total traffic of finding the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) is managed surpasses default threshold value, perhaps the cloud Radio Access Network is because processing capacity is limited in real time, make its transmission quality, be packet loss, when any one performance index in the delay performance of throughput or end-to-end transmission were reduced to less than its predetermined threshold, the intelligence that all triggers the cloud Radio Access Network of centralized architecture automatically strengthened function; And when strengthening the transmission capacity of radio frequency unit to the light back haul link of cloud computing server and surpass threshold value, the compression processing capacity of triggering wireless signal is to adapt to the bandwidth requirement of limited light back haul link; Described method comprises following operating procedure:
Step 1 according to the network planning, arranges common remote radio unit (RRU) earlier and realizes professional basic covering, and all base band signal process and Radio Resource management and control function are all concentrated on cloud computing server; Simultaneously, the zone big in traffic carrying capacity or coverage is big, set in advance or set up a plurality of potential enhancing remote radio unit (RRU)s that can carry out base band signal process, these potential enhancing remote radio unit (RRU)s are interconnected by optical fiber and a plurality of common remote radio unit (RRU), and are respectively equipped with the interactive interface of professional and control information separately; And these common remote radio unit (RRU)s insert cloud computing server by potential enhancing remote radio unit (RRU);
Step 2, potential enhancing remote radio unit (RRU) judges every setting cycle T1 whether the total traffic of the common remote radio unit (RRU) of its management surpasses predetermined threshold value C1 continuously, perhaps the cloud Radio Access Network is owing to handle limited in real time, its transmission quality, be packet loss, throughput or end-to-end transmission the time Yanzhong any one performance index be reduced to less than its predetermined threshold R1
iThe time, automatically the intelligence that triggers the cloud Radio Access Network of centralized architecture strengthens function, the method that the potential enhancing remote radio unit (RRU) that just sets in advance or set up adopts software to download, automatically download baseband signal processing module from cloud computing server, make it be converted to the enhancing remote radio unit (RRU); In the 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;
Step 3 strengthens remote radio unit (RRU) the base band signal process of all coupled common remote radio unit (RRU)s is all concentrated on himself, and wireless signal is carried out the cooperation transmission that comprises cooperation precoding, decoding, channel decoding and modulation handle; And corresponding Radio Resource management and control function still concentrates on cloud computing server;
Step 4, strengthening remote radio unit (RRU) judges every setting cycle T2 whether the transmission capacity of light back haul link surpasses between itself and the cloud computing server and sets threshold value D1, if just trigger wireless signal compression processing capacity, to adapt to limited light back haul link bandwidth requirement; If not, then remain stationary constant;
Step 5, strengthen the remote radio unit (RRU) cycle monitoring and judge whether the total traffic of the common remote radio unit (RRU) of its management is less than predetermined threshold value C2 continuously, simultaneously, judge the cloud Radio Access Network transmission quality, be packet loss, whether totally three performance index of the time delay of throughput or end-to-end transmission all is higher than its predetermined threshold R2
iIf these two judged results satisfy simultaneously, then this enhancing remote radio unit (RRU) just is converted to potential enhancing remote radio unit (RRU), and cloud computing server is transferred in the signal processing of the common remote radio unit (RRU) of its management is again focused on; In the formula, R2
iBe 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 the described network-building method, relate to following network node unit:
Cloud computing server is used for focusing on the data message of cloud wireless access networking wireless access end, and resource allocation conditions is concentrated management and control;
The light back haul link is used for transfer data information between remote radio unit (RRU) and cloud computing server;
Common remote radio unit (RRU) is used for realizing the wireless signal transmitting-receiving of wireless access end, in the zone that strengthens remote radio unit (RRU) is not set, directly is connected with cloud computing server by the light back haul link; In the zone that strengthens remote radio unit (RRU) is set, be connected to the remote radio unit (RRU) of enhancing by optical fiber;
Strengthen remote radio unit (RRU), comprise potential enhancing remote radio unit (RRU), the common remote radio unit (RRU) that is used for it is managed, connect by optical fiber realizes that the cooperation transmission of wireless signal handles, and be connected with cloud computing server by the 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) dispose in the gamut of cloud Radio Access Network at needs, according to the network planning and each regional traffic carrying capacity size and footprint size thereof, common remote radio unit (RRU) and the corresponding frequency spectrum resource of configuration and basic parameter are set, for this cloud Radio Access Network provides professional basic covering;
(12) or zone that coverage big big in traffic carrying capacity, set in advance or set up a plurality of potential enhancing remote radio unit (RRU)s that can carry out base band signal process, common remote radio unit (RRU) in this zone is by optical fiber and the interconnection of potential enhancing remote radio unit (RRU), and inserts cloud computing server by these potential enhancing remote radio unit (RRU)s; Common remote radio unit (RRU) in the zone that all the other traffic carrying capacitys are little or coverage is little directly inserts 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) potential enhancing remote radio unit (RRU) every setting cycle to network in the variation of traffic needs and the performance of cloud Radio Access Network monitor, when the total traffic of finding the common remote radio unit (RRU) that potential enhancing remote radio unit (RRU) is managed surpasses predetermined threshold value C1 continuously in setting cycle T1, perhaps the cloud Radio Access Network is owing to handle limited in real time, its transmission quality, be packet loss, throughput or end-to-end transmission the time Yanzhong any one performance parameter be reduced to less than its predetermined threshold R1
iThe time, the intelligence that triggers the cloud Radio Access Network of centralized architecture automatically strengthens function;
(22) the potential enhancing remote radio unit (RRU) that sets in advance or set up passes through method for downloading software, automatically comprise joint transmission and the relevant parameter of cooperative beam figuration technology and the baseband signal processing module of algorithm from the cloud computing server download, make it be converted to the enhancing remote radio unit (RRU); At this moment, this enhancing remote radio unit (RRU) is gathered with the node cluster that its a plurality of common remote radio unit (RRU) of managing constitutes cooperative multipoint transmission.
5. method according to claim 4, it is characterized in that: the structure of described enhancing remote radio unit (RRU) is formed, except comprising original parts of common remote radio unit (RRU): the framing of being responsible for the common public radio interface data, separate frame and the synchronous fiber interface module of Clock Extraction, finish Digital Up Convert, Digital Down Convert, the digital intermediate frequency module of crest factor decay and digital predistortion function, finish analog-to-digital conversion, the radio-frequency (RF) transceiver module of rf modulations demodulation and filtering enlarging function, finish the power amplification of radio frequency transmissions and the power amplifier LNA module of the low noise enlarging function that receives small-signal, and finish beyond the front end filter module of out of band signal inhibit feature, the fiber interface module of setting up the cooperation transmission baseband signal processing module and being connected with this cooperation transmission baseband signal processing module between fiber interface module and digital intermediate frequency module also, 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 increase and network performance decline, download the respective wireless signal processing module from cloud computing server, so that potential enhancing remote radio unit (RRU) is converted to the enhancing remote radio unit (RRU), the signal that its common remote radio unit (RRU) of managing is carried out cooperation transmission is handled; And and the digital intermediate frequency module between mutually transmission through the data message of collaborative process; The fiber interface module of the common remote radio unit (RRU) that described connection of setting up is managed is used for receiving the data message of common remote radio unit (RRU), in order to carry out the base band signal process of cooperation transmission, also be responsible for sending the management information of cooperation transmission and the concentrated management and control information of Radio Resource; Described original fiber interface module then connects cloud computing server, for the data message after handling through the cooperation transmission baseband signal processing module to the cloud computing server transmission, and receives cloud computing server to the concentrated management and control information of Radio Resource.
7. method according to claim 1 is characterized in that, described step 4 comprises following content of operation:
(41) strengthen remote radio unit (RRU) its with the information interaction periodicity T2 of cloud computing server in, detect this enhancing remote radio unit (RRU) to the transmission capacity of light back haul link between the cloud computing server whether above higher limit D1, if not, it is constant then to remain stationary; If then trigger corresponding wireless signal compression and handle, namely carry out subsequent step (42), to adapt to limited light back haul link bandwidth requirement;
(42) strengthening remote radio unit (RRU) adopts the IQ data compression technique triggering wireless signal compression of optimizing to handle: the remote radio unit (RRU) of enhancing is unit with the chip of predetermined quantity, the IQ data of the common remote radio unit (RRU) that obtains are compressed according to the compressibility factor of these IQ data, and the IQ data after will compressing are carried out framing according to the isl frame form of high-speed interface agreement; Then, give cloud computing server with the data behind the framing via Optical Fiber Transmission again; Described IQ data are the baseband digital signals that constituted by I road solid part signal and Q road imaginary signals.
8. method according to claim 1 is characterized in that, described step 5 comprises following content of operation:
(51) strengthen remote radio unit (RRU) and detect the variation of traffic needs in the network and the performance of cloud Radio Access Network every setting cycle T3, when its total traffic of finding the common remote radio unit (RRU) of this enhancing remote radio unit (RRU) management is less than predetermined threshold value C2 in the T1 at the appointed time continuously, and the transmission quality of cloud Radio Access Network, be packet loss, throughput or end-to-end transmission the time Yanzhong three performance index all be higher than its predetermined threshold R2
iThe time, just trigger the intelligent adaptation function of the cloud Radio Access Network of centralized architecture automatically;
(52) strengthen remote radio unit (RRU) and recover it automatically and become potential enhancing remote radio unit (RRU), and the signal processing function of the common remote radio unit (RRU) of its management is transferred to cloud computing server again focus on.
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