Anyone who is familiar with communication technology or going abroad often knows that there are 3 mainstream 3G technologies with the largest number of people in the world. What we are going to introduce in this issue is the CDMA technology that was popular in Korea, Japan and other places. CDMA users who have recently roamed to Thailand, Brazil, and New Zealand will find that these countries that can directly roam in the past have to change to GSM mobile phones in order to roam and surf the Internet. CDMA operators in the three countries mentioned above shut down the CDMA network in early July this year and switched to GSM and WCDMA networks.
These signs indicate that the evolution of CDMA to 4G faces unexpected twists and turns. The reason lies in the "father of CDMA", the main advocate of the technology and intellectual property rights holders-Qualcomm, USA has abandoned the long-planned CDMA network 4G upgrade program UMB. Qualcomm is a legendary company. While promoting many major innovations in the field of wireless communications, it has mastered many key technology patents and achieved huge profits by charging patent licensing fees to upstream and downstream manufacturers. The CDMA system is the product of Qualcomm. It occupies less frequency band resources, but provides a better experience and can accommodate more users. Therefore, it is widely welcomed by operators around the world. The operator has built a CDMA network. However, it is precisely because of the excessively high licensing fees charged by Qualcomm that many mobile phone manufacturers and operators are overwhelmed. Because of the existence of licensing fees, CDMA mobile phones provided by mobile phone manufacturers have been far less than GSM mobile phones. Good wine is also afraid of deep alleys. Between the "technology leading the market" that no one applauds and the "industry chain winning" that is full of enthusiasm, communication operators have chosen the latter. In addition, because of its unwillingness to compromise on patent licensing fees, Qualcomm has provoked countless lawsuits for itself around the world, and eventually led to the push of its 4G standard UMB, and no one in the world will support this standard. .
It is for these reasons that many foreign operators focusing on long-term development have begun to switch from CDMA to LTE. The first step is to gradually abandon the CDMA network and build a more common 3G WCDMA network. KDDI, Japan's largest CDMA network operator, and Verizon, the largest CDMA network operator in the United States, have both begun upgrading to LTE's 4G network.
The communication industry has always lacked excellent technology. In the continuous upgrading of technology, people's lifestyles have also changed. The excellent technology of CDMA will disappear on the historical stage of the communication industry by integrating into LTE.
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