| Through the research and design of a multi-mode and multi-card mobile phone system, a complete grasp and in-depth understanding of the implementation of a MCMM system support software. The so-called MM mobile phone refers to a mobile phone can be arbitrarily used in mobile network completely different sets, without the need for shutdown or restart action. MM meaning, strictly speaking is divided into two kinds, one is the generalized multi-mode, two mobile communication system and its actual especially is now very popular, GSM and CDMA and a PHS format; another is to narrow the multi-mode, is actually contains the GSM and CDMA stages of the rising level of for example, 2G, 2.5G and 3G can also be called a die. So the multi-mode mobile phone, it means that the system of the cell phone, can support more than one mode, can be GSM and CDMA format, can also be GSM one, 2G, 3G and 4G support. The so-called multi-card mobile phone refers to a slot inside the mobile phone has multiple SIM, multiple SIM can be inserted at the same time, it can support the identification of multiple SIM cards. Standard requirements for each card, the concept that requires reference multi-mode, multi-card support, can make the same mode support; can also be different mode support. In theory, all can be realized. The definition depends mainly on the product itself. Based on the Android smart phone system, how to design and implement of multi card multimode system, is the key basic research contents and attention.In fact, the MM mobile phone also is not new to the card design, currently on the market there are still a lot of double mode double card mobile phone in the sale. However, our design scheme is not only able to support dual mode dual card, but a multimode multi-card. In addition, the more it is worth mentioning that, we can realize the adaptive MCMM, that is to say, we can dynamically detect the current mobile phone hardware capabilities, intelligent perception of its hardware devices can support model or card number, intelligent remind users of various feasible pattern matching, to achieve a machine in the hands of the real, for all over the world advantage. Of course, the first is our phone hardware can support enough mode. On the practical significance, a simple list of several practical scenarios, we are easy to understand. Many business people often travel, domestic and even abroad, if a card world away, it is conceivable that expensive roaming charges is we need to consider; even if go to a country completely is not supported by the network system, the cell phone with a completely useless; if a MCMM, in a completely local directly buy a SIM card, to enjoy the local cheap communication cost, and if the model suitable for the network, the original SIM can continue to use, will not miss some of the key telephone, too. In addition, the economy is still not fully developed countries and regions, such as India and many other places, the whole family can only buy a mobile phone, then each family member can be equipped with a SIM card, you can also choose different system card according to each member of the family will, it can satisfy the need of telephone use let each member has its own contact crowd, this is since 2010, India the rapid development of the three SIM card three standby mobile phone, Spreadtrum, 8810 chip with the market, even back to life. |
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