Take advantage of the shortcomings, network sharing is an opportunity
Company A's predicament is that it is a 2G mobile operator under the second brand of T country, but has not bid for a 3G license, and can only use temporary licenses to develop 3G users.
More than 1,000 3G sites deployed by the company in the capital of country T have been put into operation. The “three nos†market strategy of not changing cards or numbers and re-registering has attracted a large number of 2G users to switch to the Internet, and 3G users have grown rapidly.
However, Company A's temporary 3G license is about to expire. At the same time, the limited 3G spectrum resources lead to limited wireless network capacity, making it difficult to accommodate more users and creating new value growth points through new services. Company A hopes to get rid of the plight of limited licenses and spectrum resources and continue to develop 3G networks.
Company B's vision
Company B, as a fixed-line operator in the country T, is eager to participate in mobile operations as soon as possible, promote its own brand in the mobile market, and build networks quickly and at low cost. After company B bids for a 3G license and has considerable spectrum resources, if it uses traditional methods to build a brand new 3G network, it will inevitably encounter the following difficulties: First, the network deployment is slow, which affects the brand launch speed; second, there is no 2G Network to ensure coverage, the end user experience is necessarily poor; third, lack of mobile network operation and maintenance experience, network quality is difficult to be guaranteed.
Network sharing, just hit it
The company and company B hope to cooperate through a network sharing technology, learn from each other's strengths and weaknesses, and jointly build a wireless network. In this way, the company can use Company 3's 3G license and spectrum resources to continue to develop its business, while Company B can save CAPEX and accelerate the launch of mobile brands through network sharing technology.
Customized MOCN realizes fast network construction
Based on grasping the needs of operators and understanding their networking, the customized MOCN solution recommended by Huawei matched the sharing requirements of 3G networks of Company A and Company B, and was successfully deployed within three months.
Through MOCN network sharing, operators A and B can share the costs of 3G licenses, reduce network construction costs, expand network coverage, and jointly enhance core competitiveness.
The same station and the same frequency point can realize sharing and exclusive enjoyment on demand
The defined standard MOCN scheme requires the same frequency point to be shared by all operators. But companies A and B have more complex needs. The value users in the mobile market of country T are concentrated in the capital. After negotiation, the two companies hope that when the frequency of the same site in the capital area is more than three, the first two frequency points will be shared by the two companies, and the latter frequency points will be exclusively owned by company B. Enjoy; in the area outside the capital, as long as one frequency point is guaranteed to be shared, other frequency points can be exclusively enjoyed by Company B. The standard MOCN scheme obviously cannot meet the above requirements. Huawei provides a personalized MOCN solution for this (as shown in Figure 1), which enables certain frequency points to be shared by two operators, while other frequency points are only used by one operator for flexible use. Exclusive, well meet the business development needs of A and B companies.
Avoid smart phone choosing network by mistake
In the traditional network, mobile phone users can only access one operator ’s home network, but in the MOCN network, mobile phone users at the same frequency face multiple operators ’networks to choose whether they can correctly access their own home network. On the network, it depends on the mobile phone's own network selection capabilities. For shared frequency points, RNC (Radio Network Controller, radio network controller), when broadcasting system messages, in addition to explicitly broadcasting a public PLMN (operator's network identification), and implicitly broadcasting the PLMN numbers of all shared operators. A general smart phone can recognize the implicit message cell, and after comparing the received PLMN with the PLMN embedded in the SIM / USIM card, it can register itself to the correct home network. Other mobile phones cannot recognize the implicit message cell, and can only select the home network with the help of RNC.
Due to the wide variety of mobile phones and the uneven quality, depending on the mobile phone to select the network by itself, there will be a small probability of wrong network selection. At the same time, the different processing procedures of the two types of mobile phones by network equipment also increase the complexity of routing and addressing and the difficulty of operation and maintenance.
Huawei's unique MOCN solution draws on the traditional network selection method, by interpreting the layer 3 messages reported by mobile phones, and shielding the difference between the reported messages of the two types of mobile phones. All mobile phones must be controlled by the RNC to choose the route. To ensure that the phone is registered on the correct home network.
Independent LOGO ensures brand influence
The operator's LOGO information is solidified in the mobile phone or SIM / USIM card. After receiving the public PLMN broadcast by the RNC, the mobile phone will be compared with the solidified information in the mobile phone or card. If it matches, the operator's LOGO information will be displayed. PLMN numbers. However, when broadcasting system messages, RNC can only explicitly broadcast a public PLMN. For unsupported mobile phones, it can only display the operator LOGO associated with the public PLMN. In this case, because Company A negotiated to use a public PLMN, there would be no LOGO display problems, and Company B faced its own dilemma that it could not be displayed on the terminal.
Huawei provides two solutions for this. One is to directly solidify and write down the LOGO name of the operator in the SIM / USIM card. Although this solution has no special requirements for the network and mobile phones, it needs to be planned and burned in advance. The information in the card. The second is to comply with the 3GPP standard, and enable the NITZ (Network IdenTIty and TIme Zone, network identification and time zone) feature from the core network, carry the operator identification to the mobile phone through the MM INFORMATION message, and refresh the operator identification information in the mobile phone (including the operator Name), the mobile phone can display its own operator ID according to the NITZ mapping.
The company chose the second solution, which finally solved the LOGO display problem, enhanced the user's sense of belonging, and improved the brand image.
Improve user perception through RNC
In the early days of network construction, in areas that are not covered by 3G signals, such as subways, operators will use roaming to 2G networks to ensure that users are always on the network. At the same time, in order to make full use of 3G network resources and allow users to enjoy 3G services as much as possible, it is required that as long as the conditions are met, the mobile phone will switch back to the 3G network as soon as possible. Since Company B does not have its own 2G network, its users ’mobile phones will register with Company A ’s 2G network when they enter an area without 3G coverage. After the 3G signal is obtained, they need to switch back to Company B ’s 3G network as soon as possible.
However, when the mobile phone reselects the network, the default mechanism of selecting the same PLMN number is adopted. The 2G PLMN number of the mobile phone of the company B before the network reselection belongs to the company. This results in the mobile phone must select the PLMN number of the company A when reselecting the 3G network. . Therefore, the mobile phone of the user of company B always went to the network of company A to try to register, then failed to search again, and finally registered on the 3G network of company B. During this period, the mobile phone will show no signal, and frequent search network prompts have occurred, which has affected User perception.
According to a specific network selection strategy, Huawei RNC will initiate a polling attempt on each operator's core network, and compare the received messages to ensure that users are registered on the correct network; at the same time, through RNC bridges and shields, to avoid network search The failure message was sent to the mobile phone, reducing the negative impact on the perception of company B users.
MulTIIMSI solves the problem of international roaming
Company B's mobile brand has a weak influence, and it does not have the capital to sign international roaming agreements with operators in other countries in the short term. Once the company's mobile phone users go abroad, they will face the embarrassing situation of being unable to roam.
Huawei's MultiIMSI solution can solve this problem. The specific method is: Company B is allowed to preset the IMSI number of Company A to the SIM / USIM card. The business hall only needs to do a mapping match when opening an account. The user of Company B roams internationally By using the company's IMSI number in the network, you can easily achieve international roaming with the help of the company's international roaming contract rules.
MOCN and POOL compatible operation
Company A and Company B each have multiple core networks, hoping to achieve POOL redundancy. The POOL solution is the most popular redundancy solution in recent years. When the device is normal, all users' load sharing is guaranteed to be registered in each network element in the redundant POOL. When there is a network element failure, users will be automatically migrated to other normal network elements. It means that the same set of wireless equipment is connected to multiple sets of core network equipment of the same operator at the same time.
After the two major solutions of MOCN and POOL are implemented in parallel, the same set of wireless equipment needs to be connected to all the core network equipment of A and B companies at the same time, which poses a challenge to RNC's routing strategy. If a traversal method is used to try to route to each core network, it will increase the user's connection time. Huawei RNC adopts a more optimized routing strategy: first determine the operator to which the mobile phone user belongs, and then register the core network element in one step according to the load of each core network of the operator. After the introduction of the POOL redundancy disaster solution, Huawei RNC only added one more step to determine the condition, and did not increase the number of rerouting. Mobile phone users can hardly perceive the change of the connection time, so as to achieve the compatible operation of the MOCN solution and the POOL solution.
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