CN106714252B - Cell switching method based on SDN (software defined network) controller under CRAN (building random Access network) architecture - Google Patents
Cell switching method based on SDN (software defined network) controller under CRAN (building random Access network) architecture Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention provides a cell switching method based on an SDN (software defined network) controller under a CRAN (building random access network) architecture, belonging to the technical field of mobile communication. The cell switching method judges whether the service or the geographic position of the user terminal changes or not through a test report, and if the change meets the switching condition, a source RRH sends a switching request to an SDN controller; the SDN selects a switching target base station for the user terminal and issues switching table modification information to the RRH and the BBU; the switching table contains target VRRH and VBBU switched by the user; after a data channel is established between the target VRRH and the VBBU, a switching preparation completion indication is respectively sent to the SDN controller; the SDN controller sends a switching permission command to the user terminal through the source RRH; and the user terminal is matched with the switching table and is switched to the target VRRH and VBBU for data transmission. According to the cell switching method provided by the invention, the SDN controller is used for controlling the switching signaling, so that the signaling for controlling interaction between base stations in the traditional switching process is reduced, and the effective separation of data forwarding and control signaling is realized.
Description
Technical Field
The invention belongs to the technical field of mobile communication, and particularly relates to a cell switching method based on an SDN (software defined network) controller under a CRAN (cognitive radio network) architecture.
Background
From the 2G era to the 3G/4G era, the 'qualitative change' of the speed of the mobile network comprehensively changes the work and life of people and allows people to have more longing for the 5G era. Particularly after 2016, 5G, so to speak, has developed a hot tide of 5G, from the standards organization, to the equipment provider, and to the operator. It must be emphasized, however, that the 5G brings about not only faster mobile network speeds, but also a more widely-connected, end-to-end, next generation mobile communication system.
The centralized, cooperative, green and cloud access networks (CRAN) centralize and virtualize deployment of baseband resources, dynamically allocate and manage the baseband resources according to user requirements, and can reduce network cost and accelerate network deployment. The technical feasibility of the existing network test is verified, the existing network test is expected to be commercially available before and after 2020, and the application of CRAN is more beneficial to the application of technologies such as coordinated multi-point transmission, ultra-dense networks, multi-access technologies and amorphous cells, and becomes one of the solutions for deploying wireless access networks.
SDN (Software Defined Network) aims at separation by control and forwarding. Its application in IP networks and transport networks is a hot spot of current research and development, and the application in mobile networks is still in the beginning. In 2020, the SDN technology is expected to be commercially available, most devices in a mobile network can be separated from a control plane by means of the SDN, and therefore centralized control and network connection scheduling are achieved; meanwhile, an operator can realize flexible combination of network and flow processing functions in a service chain mode based on user, network and service information, and customized network service is provided.
The efficient combination of CRAN and SDN can make existing networks more flexible and intelligent. With the increasing of the network density, the switching of users between cells becomes more and more frequent and complex, and the effective separation of switching signaling and data forwarding is realized by adopting the SDN controller, so that the complexity of the switching process can be greatly reduced, and the network is more flexible and controllable. On the other hand, the software definition of the access network accelerates the software process of the whole network, so that the whole network evolves towards the direction of flattening, intellectualization and centralization.
Disclosure of Invention
In view of this, an object of the present invention is to provide a cell handover method based on an SDN controller under a CRAN architecture, where the SDN controller is used to perform handover signaling control, and the SDN controller can effectively separate control signaling from data transmission.
In order to achieve the purpose, the invention provides the following technical scheme:
a cell switching method based on an SDN controller under a CRAN architecture comprises the following steps:
the method comprises the following steps: when a source RRH receives a test report sent by a user terminal, judging whether the user terminal meets a switching condition;
step two: if the user terminal meets the switching condition, the source RRH sends a switching request to the SDN controller;
step three: the SDN controller makes a switching decision and selects a switching target base station for the user terminal;
step four: the SDN controller issues modification switching table information to the RRH and the BBU;
step five: a handover preparation process;
step six: the SDN controller sends a switching permission command to the user terminal through the source RRH;
step seven: and the user terminal receives the switching allowing command, matches the switching table and switches the switching allowing command to the target base station to complete cell switching.
Further, the switching condition includes that the service transmitted by the user terminal changes or the geographical position of the user terminal changes.
Further, when the switching condition is that the user terminal transmission service changes, the SDN controller executes intra-cell switching.
Further, when the handover condition is that the geographical location of the user terminal changes, the SDN controller performs inter-cell handover.
Further, the switching table includes the following information, a target physical RRH identifier, a target virtual RRH identifier, a target physical BBU identifier, and a target virtual BBU identifier.
Further, the fifth step specifically includes sending a handover preparation completion indication to the SDN controller after the target VRRH and the target VBBU establish a data channel.
The invention has the beneficial effects that: the cell switching method based on the SDN controller under the CRAN architecture provided by the invention provides a switching method based on service transformation for users on the basis of the traditional switching based on the geographic positions of the users, and the SDN controller is adopted to control cell switching signaling, so that the signaling for controlling interaction between base stations in the traditional switching is reduced, and the effective separation of data forwarding and control signaling is realized.
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In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a schematic diagram of a cell handover scenario under a CRAN architecture;
FIG. 2 is a schematic structural diagram of the switching table according to the present invention;
fig. 3 is a diagram of an intra-cell switching flow according to the present invention;
fig. 4 is a flowchart of inter-cell handover according to the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a cell switching method based on an SDN controller under a CRAN architecture, which is a switching method based on service transformation for users on the basis of the traditional switching based on user positions, wherein the user service switching is actually carried out at the same geographical position, and the switching between different logic transmission ports is carried out under the same physical RRH (Remote Radio Head); the SDN controller is adopted to control the cell switching signaling, so that the signaling for controlling interaction between base stations in the traditional switching is reduced, and the effective separation of data forwarding and control signaling is realized; the invention also provides a concept of the switching table, the network equipment RRH and BBU are provided with the switching table, network parameters required by user switching are recorded in the switching table, the SDN controller carries out absolute control on the switching table, and the user carries out switching matching on the switching table.
Referring to fig. 1, fig. 1 is a schematic diagram of a cell handover scenario under a CRAN according to an embodiment of the present invention. In the case of the present invention, with the CRAN architecture, the base station may be divided into a local Remote Radio Head (RRH) and a baseband processing unit (BBU) of the processing center, and the RRH and the BBU are controlled by the SDN controller. When a user has a cell moving to another cell, or when the service of the user changes, a handover condition is triggered to initiate a handover request. The method comprises the following steps:
the method comprises the following steps: when a source RRH receives a test report sent by a user terminal, judging whether the user terminal meets a switching condition;
step two: if the user terminal meets the switching condition, the source RRH sends a switching request to the SDN controller;
step three: the SDN controller makes a switching decision and selects a switching target base station for the user terminal;
step four: the SDN controller issues modification switching table information to the RRH and the BBU;
step five: a handover preparation process;
step six: the SDN controller sends a switching permission command to the user terminal through the source RRH;
step seven: and the user terminal receives the switching allowing command, matches the switching table and switches the switching allowing command to the target base station to complete cell switching.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a switching table according to an embodiment of the present invention. In the present invention, the main contents of the switching table include: RRH ID: a target physical RRH identification; VRRH ID: a target virtual RRH identity, i.e. a target physical RRH port; BBU ID: a target physical BBU identification; VBBU ID: a target virtual BBU identification, i.e. a target physical BBU port.
The intra-cell handover is generally based on service or system requirements, and is essentially based on handover between different slice networks, that is, handover between different VRRH. The physical cell position of the user belongs to the same cell, and the switching of different virtual cells is performed under the aspect of logic control.
Referring to fig. 3, fig. 3 is a flowchart of an intra-cell handover provided in an embodiment of the present invention, and as shown in the figure, the intra-cell handover method in the present invention specifically includes the following steps:
step 101: when the source RRH receives the measurement report and finds that the user transmission service changes, the source RRH judges that the user meets the switching condition;
step 102: the source RRH sends a switching request to the SDN controller;
step 103: the SDN controller executes a switching strategy according to a user switching request and network information, and selects or creates corresponding virtual cell base stations VRRH #2 and VBBU #2 under the cell for a user;
step 104: the SDN controller issues a command to modify switching table information in a local RRH and a BBU, so that a switching table contains a target VRRH # 2 and a target VBBU #2 switched by a user;
step 105: after a data channel is established between a target VRRH # 2 and a target VBBU # 2, a switching preparation completion indication is respectively sent to the SDN controller;
step 106: the SDN controller sends a switching allowing command to a user through a local RRH;
step 107: and the user is matched with the switching table to switch to the target VRRH # 2 and VBBU #2 for data transmission.
The inter-cell handover is generally required to be performed based on the change of the mobile location of the user, and is essentially performed between cells at different locations, i.e. between different RRHs. When the user changes based on the position and the service requirement also changes, the user can switch according to the switching process in the cell.
Referring to fig. 4, fig. 4 is a flowchart of inter-cell handover provided in an embodiment of the present invention, and as shown in the figure, the inter-cell handover method in the present invention specifically includes the following steps:
step 201: when the source RRH # 1 receives the measurement report, the change of the geographical position of the user is detected, and the user is judged to meet the switching condition;
step 202: the source RRH # 1 sends a switching request to the SDN controller;
step 203: the controller executes a switching strategy according to the user switching request and the network information, and selects or creates a virtual cell base station VRRH # 2 and a virtual cell base station VBBU # 2 of a cell related to the user geographical switching for the user;
step 204: the SDN controller issues a command to modify switching table information in a target cell RRH # 2 and BBU # 2, so that the switching table contains target VRRH # 2 and VBBU # 2 switched by a user;
step 205: after the target VRRH # 2 and the target VBBU # 2 establish data channels, respectively sending switching preparation completion instructions to the SDN controller;
step 206: the SDN controller sends a switching allowing command to a user through a target RRH # 2;
step 207: and the user is matched with the switching table to switch to the target VRRH # 2 and VBBU # 2 for data transmission.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. A cell switching method based on an SDN controller under a CRAN architecture is characterized by comprising the following steps:
the method comprises the following steps: when a source RRH receives a test report sent by a user terminal, judging whether the user terminal meets a switching condition;
step two: if the user terminal meets the switching condition, the source RRH sends a switching request to the SDN controller;
step three: the SDN controller makes a switching decision and selects a switching target base station for the user terminal;
step four: the SDN controller issues modification switching table information to the RRH and the BBU;
step five: a handover preparation process: after a data channel is established between the target VRRH and the target VBBU, a switching preparation completion indication is respectively sent to the SDN controller;
step six: the SDN controller sends a switching permission command to the user terminal through the source RRH;
step seven: and the user terminal receives the switching allowing command, matches the switching table and switches the switching allowing command to the target base station to complete cell switching.
2. The cell handover method according to claim 1, wherein the handover condition includes a change in a user terminal transmission service or a change in a user terminal geographical location.
3. The cell handover method according to claim 2, wherein when the handover condition is a change in a user terminal transmission service, the SDN controller performs intra-cell handover.
4. The cell handover method according to claim 2, wherein when the handover condition is a change in a geographical location of the user terminal, the SDN controller performs inter-cell handover.
5. The method for cell handover under CRAN architecture based on SDN controller according to any of claims 1-4, wherein the handover table includes information of target physical RRH identifier, target virtual RRH identifier, target physical BBU identifier, target virtual BBU identifier.
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| CN106131891A (en) * | 2016-08-30 | 2016-11-16 | 重庆邮电大学 | A kind of resource mapping apparatus based on SDWN and method |
| WO2016192636A1 (en) * | 2015-06-01 | 2016-12-08 | Huawei Technologies Co., Ltd. | System and method for virtualized functions in control and data planes |
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|---|---|---|---|---|
| CN103281730A (en) * | 2013-06-25 | 2013-09-04 | 重庆邮电大学 | System and method of realizing C-RAN load balance on the basis of household base stations |
| CN105744575A (en) * | 2014-12-11 | 2016-07-06 | 中国电信股份有限公司 | Method, wireless network SDN controller and system for switching cells |
| CN104822181A (en) * | 2015-04-30 | 2015-08-05 | 北京邮电大学 | Wireless resource scheduling method |
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