"Although I bought a 3G mobile phone, I often use a 2G network." Recently, Xiao Wang obtained a TD-SCDMA (hereinafter referred to as TD) mobile phone in the mobile business hall through the "phone call for mobile phone" activity, but it troubled him Yes, because the TD network coverage in his city is not yet perfect, the TD network call effect is not ideal. As a last resort, Xiao Wang had to choose the default network of the mobile phone as GSM.
In fact, there are not a few TD users who have the same experience as Xiao Wang. According to network data from a company in a province of China Mobile, as of now, the number of VLR registered users in this province accounts for 29.49% of the total number of TD numbers. That is to say, TD users who are actually online and have call records account for only the total number of numbers 1/3, compared with 75.98% of the actual GSM users in the province ’s GSM network, the proportion of TD ’s “users†is indeed low.
"For China Mobile, because TD new users frequently use the GSM network, a considerable portion of TD traffic and data traffic migrate to the GSM network, which makes the already affluent GSM network capacity more tight, but the TD capacity is relatively Idle. "The person with the surname Guo from Shanxi Mobile Network Optimization Department said.
This situation seems to be contrary to the original intention of China Mobile to fully develop TD-just when they are building a TD network at full speed and hoping that users can continue to gradually migrate services and traffic to the 3G network, TD traffic has reversed.
Different levels of traffic migration
The person told reporters that within the scope of the entire network, about 1/5 of the TD network's traffic was migrated to the GSM network. At the same time, an insider of Zhejiang Mobile also confirmed this "backward draw" phenomenon.
"Currently, there is a phenomenon of TD traffic migrating to GSM networks, including Zhejiang. However, due to the different TD network coverage and optimization progress of each province, the degree of traffic migration is also different." The above-mentioned sources said.
The same is true. A Beijing TD user told reporters that just last year, his TD mobile phone often ran out of power because it could not find a signal; this year, the quality of TD calls in Beijing has improved significantly. However, occasional network jumps can occur during calls.
When the reporter asked whether it was related to the default setting of the network selection in the user's TD terminal, the aforementioned Zhejiang Mobile explained that under normal circumstances, the factory setting of all TD terminals is to preferentially select "TD network", only when the user is in the area When the TD network is below the specified threshold or the signal disappears, the terminal will jump to the 2G network.
From this perspective, TD network traffic "backward" is not intended by operators. "It should be said that the cause of this phenomenon is very complex, but obviously it is inseparable from the TD network range limitation and inter-network interference." The source added.
The edge of the network is a "retroversion" frequent area
"This is traceable. Since TD's network coverage was initially centered on the city and gradually expanded to the surrounding counties and villages, the weakly covered areas on the edge of the city became TD's 2G network to implement traffic The place where migration occurs frequently, "said a mobile person who has long been engaged in network optimization.
A recently released schematic diagram of TD to 2G handover ratio in a dense urban area of ​​a city also illustrates this. The reporter found that the ratio of TD to 2G handover in basic TD network weak coverage areas at the edge of urban areas basically exceeds 1/5. On the other hand, there will also be areas where individual handover ratios exceed 1/5 in some central areas where TD networks cover densely.
In response to this phenomenon, the aforementioned network optimists analyzed that these areas are likely to be in residential areas and indoor buildings. Since the initial stage of network construction is basically based on outdoor TD macro base station construction, in some areas with dense buildings, many TDs do exist The indoor blind spot of the network.
"It's like lighting several streets at the same time with headlights. Under the light, we will feel that the brightness of the illumination area is different. For example, at the junction of the interior and different lighting points, the light is It will be darker, and the principle of network coverage is also the same. We have mastered these blind spots through drive testing and adopted further optimization measures, such as adding micro base stations or supplementary repeaters. "
The top priority is to increase TD coverage
So, how to deal with the current "traffic reverse" phenomenon presented by the TD network, and thus increase the user's trust in the TD network, the aforementioned Zhejiang Mobile person's answer seems very calm, "such a goal is not incomplete, but also It is not a one-off process. "Traffic inversion" should be regarded as an inevitable stage in the process of TD network optimization and belongs to a staged product in the process of TD network optimization. "
According to data released by the Ministry of Industry and Information Technology at the beginning of this year, as of the end of February, China Mobile ’s TD commercial network covered 238 cities, while China Telecom and China Unicom covered 342 prefecture-level cities, 2055 counties, and more than 6,000 cities. The township's cmda2000 network and 335 WCDMA commercial networks have taken the lead.
For the current stage of China Mobile, the focus of the network should be on improving the coverage of TD network, as soon as possible to achieve TD coverage in more cities nationwide. However, this coverage is far from the seamless and smooth TD network experience that users need.
"Each stage has tasks for each stage. Now it is demanding that the TD network of the covered city can catch up with the GSM network, which is indeed far-fetched. However, China Mobile can adopt the method of establishing a demonstration area to establish some good network experience for existing TD users. The benchmark area. "A person with the surname Li from the Telecommunication Research Institute of the Ministry of Industry and Information Technology told reporters.
It is understood that, in addition to accelerating the completion of the national TD network layout, China Mobile ’s TD network construction and optimization ideas adopt the strategy of optimizing coverage in important areas in terms of optimization. In areas and streets that frequently generate traffic and data traffic, priority coverage should be given to deep coverage, such as business areas such as hotels, office buildings, airports, and some public places with dense crowds such as schools and gymnasiums.
"TD2 Year Online Excellence Is Only the Start"
The aforementioned person with the surname of Li told reporters that from the perspective of China Mobile's current network construction efforts and investment deployment ratio, the future TD network will inevitably become its main network, and the GSM network has undergone years of network expansion and cell division, and its capacity has been Close to saturation, "The future business volume is definitely to migrate to the 3G network, but it may take a long time for the TD network to mature, after all, GSM has developed for 10 years, and the 2-year TD network optimization is only Is the beginning. "
However, the engineer named Ding of China Mobile Design Institute also said that TD network optimization does not completely replicate the evolution of the GSM network. The future deployment schedule mainly depends on its own network characteristics and co-site with GSM.
"The 3G frequency band to which the TD network belongs is higher than the GSM frequency band, and its corresponding coverage capacity is also lower than that of GSM. Therefore, the TD network needs to focus on the coverage rate in the deployment; while it has certain advantages in terms of network capacity, the TD network only needs 70% of the GSM site can meet its coverage requirements. "The source said.
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