CN100433888C - A method and system to utilize multi 802.16d base station to cover subscriber group densely - Google Patents
A method and system to utilize multi 802.16d base station to cover subscriber group densely Download PDFInfo
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Abstract
The invention relates to a method for using several 802.16d base station to cover user group, and relative system. Wherein, said method comprises that 1, insulating base station interference in limited frequency resource, to use the resource fully and confirm needed band width; 2, user terminal automatically selects the base station with strong signal. To automatically access into said base station; 3, user terminal identify parameter unique database management manages the user terminal identification, when the user terminal is in the blind area of 802.16d base station, user terminal switches into present mobile network. The invention can access into 802.16d base station with strongest signal without hand selection, to realize unique manage on user identification, and use the services of WiMAX.
Description
Technical field
The present invention relates to a kind of communication technology, relate in particular to a kind of method and system of utilizing a plurality of 802.1 6d base station cover subscriber group denselies.
Background technology
Access network is the basis of data stationary business, the intellectuality of access device, access technology the variation and broadband be the development trend of future network.According to the development of technology and the situation of existing network, access network technology mainly is divided into wired access and two kinds of big modes of wireless access: wired mode adopts optical fiber to insert or the existing copper gauze is carried out upgrading, is used as the major technique and the means of broadband access.Wireless access mainly comprises LMDS (LMDS), wireless lan (wlan) and inserting of microwave whole world interoperability (WiMAX) etc., because the ambulant advantage that wireless technology itself is had, make it have bright development prospect, especially the WiMAX technology has higher access bandwidth and bigger coverage, has more won user's favor.The WiMAX technology has many-sided advantages such as bandwidth height, wide coverage, support move, and is considered as the NGBW technology by industry, has very wide prospect.Along with improving and the maturation of product of standard, WiMAX will become effectively replenishing of cable broadband access way.Because part operator is being deficient in resources aspect the cable broadband access, the WiMAX technology can become the effective means of development broadband services.The broadband IP network that the WiMAX network inserts as last kilometer of fixed wireless or moves inserts, and the main flow business of mobile operator is not constituted substantive the threat, and is a kind of optimum replenishing to its comprehensive access capability and professional providing capability.Wireless last kilometer overlay network technology such as employing WiMAX certainly will will increase the user's access capability and the penetration of service ability of operator greatly, enrich various application covering powers, to the deficient area infiltration of city, suburb and rural area copper cable, improve existing network user's loyalty simultaneously, thus the comprehensive access that forms multiple business ability, multiple access means and deposit.
The WiMAX terminal has variform, comprises that outdoor version, indoor type, cassette, notebook computer are embedded, hand-hold type etc.As the first step that WiMAX uses, support that static outdoor version and the indoor type terminal that inserts is significant.Particularly the indoor type terminal does not need house wiring, is the important means that realizes wireless digital subscriber line (DSL).But the indoor terminal signal is not as outdoor terminals, and the WiMAX frequency resource is less at present in addition, single base station finite capacity, and how utilizing a plurality of base stations that customer group is carried out the intensive covering of high power capacity is a difficult problem.
In the prior art, can allow a plurality of base stations cover a user, but the user can only pass through manual mode, the frequency of each base station is set respectively, and adopt which frequency by manual relatively deciding.Allow the user can select different base stations, must be by the authentication of these base stations, at present a lot of user authentication datas are to be configured in the different base stations, thereby underaction.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of method and system of utilizing a plurality of 802.16d base station cover subscriber group densely, its purpose is, utilize a plurality of 802.16d base station cover subscriber group densely, make user terminal can insert the strongest base station of signal automatically, and user end certification is carried out unified management.
The invention provides a kind of method of utilizing a plurality of 802.16d base station cover subscriber group densely, may further comprise the steps:
Step 1, the insulating base station interference under the limited condition of frequency resource is used to make full use of resource, and guarantees the user's request bandwidth;
Step 2, the strong signal of user terminal automatic selection of optimal base station is used to make described user terminal to insert strong signal base station automatically;
Step 3, the data base administration of described user end certification improve parameter unification is used for described user end certification is carried out unified management;
When described user terminal was in the blind area of 802.16d base station, described user terminal switched to existing mobile network.
Isolation in the described step 1 comprises frequency isolation, stops isolation apart from isolation, polarization isolation, direction isolation and/or building.
The parameter of described user end certification is deposited in the XML (extensible Markup Language) mode.
The parameter of described user end certification is inquired about, is obtained by the Lightweight Directory Access Protocol mode.
Described step 2 may further comprise the steps:
Step 51, described user terminal scanning down link, foundation is synchronous with the base station;
Step 52, described user terminal extract transmission parameter from upstream channel descriptor;
Step 53, described user terminal are found range;
Step 54, described user terminal are indicated according to signal strength signal intensity, insert the strongest base station of signal.
The invention also discloses a kind of system that utilizes a plurality of 802.16d base station cover subscriber group densely, comprising:
Isolation module is used for the insulating base station interference under the limited condition of frequency resource, thus the resource of making full use of, and guarantee the user's request bandwidth;
User terminal, but the strong signal of automatic selection of optimal base station make described user terminal insert strong signal base station automatically;
The unified certification module is used for the data base administration of described user end certification improve parameter unification;
Handover module is used for when described user terminal is in the blind area of 802.16d base station, and described user terminal switches to existing mobile network.
The present invention can use a plurality of base stations provide intensive user capacity and signal, reduce the interference between the base station and allow user's automatic selection of optimal high-intensity signal, can be downgraded to cdma2000 or other mobile networks under special circumstances, guarantee the continuation of customer service.The present invention can make the terminal use need not manually to select and insert the strongest 802.16d base station of signal, and unified management to authentification of user and the various integrated services that can use WiMAX to provide have been provided.
Description of drawings
Fig. 1 is the network structure of the embodiment of the invention;
Fig. 2 is the network planning schematic diagram of the embodiment of the invention;
Fig. 3 is the unified certification Database Systems schematic flow sheet that utilizes the embodiment of the invention;
Fig. 4 utilizes the 802.16d system of the embodiment of the invention and cdma2000 to switch the structural representation that merges;
Fig. 5 is the structural representation that utilizes many base stations cover subscriber group densely of the embodiment of the invention.
Embodiment
The method and system of utilizing a plurality of 802.16d base station cover subscriber group densely of the present invention, this method may further comprise the steps: step 1, the insulating base station interference under the limited condition of frequency resource is used to make full use of resource, and guarantees the user's request bandwidth; Step 2, the strong signal of user terminal automatic selection of optimal base station is used to make described user terminal to insert strong signal base station automatically; Step 3, the data base administration of described user end certification improve parameter unification is used for described user end certification is carried out unified management; When described user terminal was in the blind area of 802.16d base station, described user terminal switched to existing mobile network.This system comprises: isolation module, be used for the insulating base station interference under the limited condition of frequency resource, thus the resource of making full use of, and guarantee the user's request bandwidth; User side terminal equipment (CPE) (referring generally to user terminal), but the strong signal of automatic selection of optimal base station make described user terminal insert strong signal base station automatically; Also comprise user terminal unified certification module, be used for the data base administration of described user end certification improve parameter unification; Handover module is used for when described user terminal is in the blind area of 802.16d base station, and described user terminal switches to existing mobile network.
The network structure of the embodiment of the invention as shown in Figure 1.Base station 101 is inserted IP kernel heart net 105 by SACP (SACP) 102 access switch 103 by switch 103.Network management system (nms) server 112, Call Control Block (CCM) 106, service server 104, user data server 113 also insert IP kernel heart net 105.Computer or phone 107 can be by indoor user terminal (SS) 111 access base stations 101 of embedded gateway, also can be connected to indoor SS 108 by gateway 109, thereby access base station 101, also can be connected to gateway 109, again by indoor SS 108, through exterior aerial 110 access base stations 101, can also be by the indoor SS 111 of embedded gateway, then by exterior aerial 110 access base stations 101.Base station 101 also can directly link to each other with IP kernel heart net 105 by SACP 102.The network planning under the limited condition of described frequency resource comprises frequency isolation: use different frequencies to reach the purpose of frequency isolation by planning different sectors, different remote terminals; Distance is isolated: strengthen the decay that the minizone distance increases interference signal intensity; Polarization isolation: the isolation that strengthens intercarrier by the different polarization modes of using carrier wave; Direction is isolated: by differently carrier transmit and receive direction being distinguished towards coming of using fan antenna and directional antenna; Other aspect can be further isolate to reduce according to concrete terrain and its features and disturb, and controls base station range with the overlay region of reducing different base station and covering with distinguish phenomenon more by adjusting base station transmitting power, antenna height, antenna tilt.
As shown in Figure 2, before carrying out the network planning, need carry out the site survey in early stage, this is comprising the collection of geodata 201, user and business 202 and polarization type 203, and then suggestion and modification cell coverage area 204, and computing service capacity and renewal network size 205, distribute the indication of radio frequency (RF) channel and signal calculated intensity (RSSI), C/I 206, monitoring network performance 207, if meet the requirements then carry out field survey 208 and network configuration 209, otherwise, repeat since 204.
The present invention will disperse to deposit to change into concentrating on the data base management system from the base station to deposit in XML (extensible Markup Language) (XML) mode to the parameter of user end certification, and inquire about, obtains by Lightweight Directory Access Protocol modes such as (LDAP).Be to utilize unified certification Database Systems schematic flow sheet of the present invention as shown in Figure 3; User end certification improve parameter unification data base management system is responsible for controlling user terminal (SS) licensing process, be that terminal sends authentication information 301 to the base station earlier, comprising CA certificate (CA-Certificate), send authentication request 302 then, comprising SS certificate (SS-Certificate,), safety (Security), ability (Capabilities) and security association sign (SAID), base station (BS) authenticates the identify label of SS, BS sends an authentication response (AK) 303 to the SS through authentication, comprising authenticate key (AUTH-Key), the cryptographic key existence cycle (Key-Lifetime), Ciphering Key Sequence Number (Key SequenceNumber), SA descriptor (SA Descriptor) and public key management (PKM) configuration, terminal sends key response 304, comprising Ciphering Key Sequence Number (Key Sequence Number), SAID and HMAC (Hash function based Message Authentication Code, message authentication code based on hash) summary (HMAC-Digest), the base station sends key response 305, comprise TEK (TrafficEncryption Key, the Business Stream encryption key) 0, TEK1, also comprise Ciphering Key Sequence Number (Key SequenceNumber), SAID, new and old TEK parameter and HMAC summary (HMAC-Digest), terminal and base station use TEK to encrypt 306 then.
The present invention is by the strong signal in user terminal automatic selection of optimal base station.Preferred process can be divided into following stages: 802.16d terminal scanning down link, and foundation is synchronous with BS's; 802.16d terminal is extracted transmission parameter from upstream channel descriptor (UCD); 802.16d terminal is found range; 802.16d the key property of base station negotiate SS; 802.16d authentication is carried out to SS in the base station, and carries out cipher key change; 802.16d endpoint registration; 802.16d terminal is set up IP with the 802.16d base station and is connected, transmits operating parameter, connects.802.16d after terminal was found range, the 802.16d terminal inserted the strongest base station of signal according to its signal strength signal intensity indication (RSSI).
As shown in Figure 4,3G core net 406 links to each other with Bill server 401, home agent 402, local AAA403, packet data serving node (PDSN) 407 and internet 413, PDSN 407 links to each other with local AAA 405, radio access node/grouping controlled entity (RAN/PCF) 404, access service node (ASN) gateway 411, existing mobile network such as cdma2000 408 comprise base station 409 and RAN/PCF404, WiMAX system 410 comprises access point 412 and ASN gateway 411, and ASN gateway 411 also can directly link to each other with internet 413.User terminal 414 can switch to CDMA 2000 systems from the 802.16d system.The present invention further remedies signal by 802.16d system and the switching of mobile network system, fusion and covers deficiency, so, when user terminal is in the blind area of 802.16d system, can switch to existing mobile network, as cdma2000.Two kinds of situations of loose coupling and close coupling are arranged, and loose coupling is changed little to existing network, and close coupling is changed big to existing network.Under the loose coupling scene, the WiMAX mobile management is realized by the WiMAX gateway, indication by the WiMAX gateway switches to mobile networks such as cdma2000, and under the close coupling scene, packet data serving node in the mobile cellular also will participate in the mobile management of WiMAX terminal, and the packet service support node indicating terminal by core net switches to existing mobile network, and mobile network is not limited to cdma2000, can also be WCDMA system, perhaps TD-SCDMA system or the like.
| Subitem | Close coupling | Loose coupling |
| Authentication | Utilize the authentication system of Cellular Networks | By setting up gateway, provide the conversion of authentication information |
| Charge | Utilize the charge system of cellular system | Realize unified the charging by conversion |
| Mobility Management Entity | The dedicated service support node of core net | Home agent (HA) |
| Switch | The handover mechanism of Cellular Networks | Mobile IP switches |
| System management | Unified management | Management respectively |
| System deployment is newly developed | Service support node upgrades, and terminal is supported multiple signaling | New gateway, the charging conversion entity |
| Standard | The interface of service support node | Extensible Authentication Protocol (EAP) |
Add and withdraw from fusion of the present invention, open telecommunications network business platform is very convenient, the expansion that scope can be unlimited.
Below in conjunction with Fig. 5, the present invention is described in further detail.
The typical building of operator are covered the following user bandwidth demand hypothesis of proposition as table 1.
Table 1 user bandwidth demand hypothesis
As can be seen from Table 1, for the ease of calculating and select the WiMAX base station deployment point position of respective numbers, the user model of 3 kinds of different building type inside has been proposed, for simplified design, do not provide possible voice and video business and IP is gone into the different demands of port band width, but the unified bandwidth demand that has provided every kind of typical customers, there is certain representativeness the whole distract that calculates thus to the demand of bandwidth, can make amendment according to actual conditions later on.The final result of user bandwidth demand hypothesis is as follows:
High-rise has 6, and every demand to bandwidth is:
(80*0.4*512*1/3)+(80*0.6*1024*1/4)=and 18Mbps, then amounting to bandwidth is 18*6=108Mbps;
Mid-rise building has 7, and as the building of the middle level among Fig. 51 ', 2 ', 3 ', 4 ', 5 ', 6 ' and 7 ', every demand to bandwidth is; (40*0.5*5 12*1/3)+(40*0.5*1024*1/4)=8.5Mbps, then amounting to bandwidth is 8.5*7=60Mbps;
Residential building has 2 area of concentrations, calculate according to 30 residential buildings each area of concentration, then every demand to bandwidth is: (10*0.6*512+10*0.4*1024) * 1/3=2.5Mbps, it is 2.5*30=75Mbps that then every area of concentration amounts to bandwidth.
According to the building distributing position, the BTS that the base station is done in following 6 places of initial option lays the place, 6 skyscrapers help occupying a commanding position and dispose the WiMAX Radio Network System as first scheme most, adopt the mode of mechanical tilt can realize the covering of building to greatest extent from eminence.
At the user bandwidth demand (8.5Mbps) of mid-rise building, can adopt the single carrier frequency sector of 3.5MHz (theoretical bandwidth is 12Mbps) to cover and to meet consumers' demand fully; And, then adopt 2 3.5MHz carrier frequency (theoretical bandwidth is 24Mbps) to cover simultaneously and can meet consumers' demand at the user bandwidth demand (18Mbps) of high-rise.So, obtain the central optimum website of Fig. 5 and select and the site type selection.As shown in table 2.
| Site location | Site type | Carrier frequency number |
| Website 501-skyscraper 1 | 3*60 degree sector | 3*3.5MHz |
| Website 502-skyscraper 2 | 3*60 degree sector | 3*3.5MHz |
| Website 503-skyscraper 3 | 4*60 degree sector | 4*3.5MHz |
| Website 504-skyscraper 4 | 2*60 degree sector | 2*3.5MHz |
| Website 505-skyscraper 5 | 2*60 degree sector | 2*3.5MHz |
| Website 506-skyscraper 6 | 5*60 degree sector | 5*3.5MHz (1V, 2V, 3V, 1H, 2H) (H represents horizontal polarization, and V represents perpendicular polarization), |
Table 2 inner city covers website and site type
In the middle of the listed site deployment of form 2, can satisfy high-rise is covered by 2 3.5MHz carrier frequency, mid-rise building simultaneously in order to save WiMAX base station space expenses, has been followed the principle that as far as possible reduces BTS site number by the minimum requirements of 1 3.5MHz carrier frequency covering simultaneously simultaneously.In the middle of this overlay model, can find 6 BTS base stations altogether, each sector of base station number is no more than 5 (websites 6) at most, consider 3*3.5MHz frequency number, simultaneously utilize different polarization modes further to increase the channeling ability on every frequency, our 6 carrier frequency obtaining are can satisfy this site type fully to cover like this.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but determine by the scope of claims.
Claims (6)
1, a kind of method of utilizing a plurality of 802.16d base station cover subscriber group densely is characterized in that, may further comprise the steps:
Step 1, the insulating base station interference under the limited condition of frequency resource is used to utilize resource, and guarantees the user's request bandwidth;
Step 2, user terminal scanning down link, foundation is synchronous with the base station; Described user terminal extracts transmission parameter from upstream channel descriptor; Described user terminal is found range; Described user terminal is used to make described user terminal to insert strong signal base station automatically according to the strong signal of signal strength signal intensity indication automatic selection of optimal base station;
Step 3 is carried out the uniform data library management to the user end certification parameter, is used for described user end certification is carried out unified management;
When described user terminal was in the blind area of 802.16d base station, described user terminal switched to existing mobile network.
2, the method for utilizing a plurality of 802.16d base station cover subscriber group densely according to claim 1 is characterized in that, the isolation in the described step 1 comprises frequency isolation, stops isolation apart from isolation, polarization isolation, direction isolation and/or building.
3, the method for utilizing a plurality of 802.16d base station cover subscriber group densely according to claim 1 is characterized in that the parameter of described user end certification is deposited in the XML (extensible Markup Language) mode.
4, the method for utilizing a plurality of 802.16d base station cover subscriber group densely according to claim 3 is characterized in that the parameter of described user end certification is inquired about, obtained by the Lightweight Directory Access Protocol mode.
5, the method for utilizing a plurality of 802.16d base station cover subscriber group densely according to claim 1 is characterized in that, described strong signal base station is the strongest base station of signal.
6, a kind of system that utilizes a plurality of 802.16d base station cover subscriber group densely is characterized in that described system comprises:
Isolation module is used for the insulating base station interference under the limited condition of frequency resource, thus the resource of utilization, and guarantee the user's request bandwidth;
User terminal is used to scan down link, and foundation is synchronous with the base station; Be used for extracting transmission parameter from upstream channel descriptor; Be used to find range; Be used for making described user terminal insert strong signal base station automatically according to the strong signal of signal strength signal intensity indication automatic selection of optimal base station;
The unified certification module is used for the user end certification parameter is carried out the uniform data library management;
Handover module is used for when described user terminal is in the blind area of 802.16d base station, and described user terminal switches to existing mobile network.
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