LTE (4G) is being tested, and even commercialized in some countries. We'll point out a benefit of helping LTE cost (per bit) cheaper than the 4G wireless broadband technologies such as HSPA current.
Many people will say immediately that LTE cheaper because high spectral efficiency, thus lowering the overall. However, many other improvements of general 4G make cheaper price:

    No RNC again, that is little more network devices.
    LTE Network transmission of a complete change. Although the notes E1/T1 still widely used, but LTE will be deployed using Ethernet over fiber / VSDL and microwave. This is a huge advantage in cost, where costs are rising E1/T1 network.
    To be fair, the current HSPA networks are changing this trend. However, there should be many changes, and still need to RNC
    Another reason is technology: LTE allows base stations to use smaller, less energy and space. In many cases, the base station will be located in or next to the old base station.
    Can not mention the latest wireless technology will be extensively used in LTE will help reduce costs
    In the medium term and long term, LTE is a catalyst to integrate multiple base stations with a transmission network, which will reduce costs for the 2G network, 3G is now (will survive a long time )

There are also some other advantages, such as self-optimizing networks (SON ) will reduce operating costs . All these things will help the cost will be cheaper 4G mobile networks today.