Global mobile IP traffic, especially video traffic, is showing an explosive growth trend. According to the data released by Cisco in January 2011, the global mobile IP traffic was 482pb per month in 2011 and 2184pb per month in 2013, of which the video traffic accounted for about 2 / 3. Mobile Backhaul is becoming the focus of data network. In China, China Mobile, China Telecom and China Unicom have launched 3G Mobile Backhaul pilot, and LTE backhaul is also under planning.

However, the cost of transmission network (including TDM) will be a major drag on the profit of operators, which will not include the cost of transmission network and TDM. The current challenges are as follows: the existing return network can not adapt to the growth of network demand; Although the backhaul expenses of operators are different due to their user composition and regional differences, the demand for backhaul will be greater; Data sensitive applications have increased dramatically. Therefore, operators must face the problem of upgrading the capacity of mobile return network.

Chris Rowen, chief technology officer of tensilia, said that the expansion of mobile return network needs to upgrade more effective radio protocols, such as LTE or LTE advanced; Build a large number of high-density honeycomb, such as macro, Pico and femto; More, more intelligent and low-power multi standard base station semiconductor devices and software; Optimize video content, including better coding, more cache, business model and manufacturers of new video content; Make the boundaries between base stations, backhaul networks, Internet backbone networks and cloud computing more blurred.

Jim McKeon, marketing director of network switching products of Broadcom, believes that users such as iPhone and BlackBerry have had a strong impact on the existing data network, and with the rapid development of 3G and 4G networks, the mobile return network has encountered a serious bandwidth bottleneck. The low bandwidth of traditional TDM link has been difficult to meet the needs of high bandwidth users. Therefore, it is necessary to seamlessly migrate from traditional TDM link to high bandwidth Ethernet.

New trends of mobile retransmission network technology and optical fiber interconnection programmable technology

McKeon said: “in order to solve the bandwidth bottleneck of high-speed mobile loopback network, we integrate seven ASSP chips such as Ethernet switch, timing processor, traffic manager, BDF processor, CES gateway, CES framer and CES buffer into a bcm56440 StrataXGS Ethernet switch chip with 40nm process, which can increase the bandwidth of traditional TDM network by 1000 times.”

In addition, Broadcom also announced the acquisition of provigent, the world’s largest microwave return mixed signal chip manufacturer, for us $313 million, which undoubtedly enhances the strength of its mobile return network solution. Altera’s platform for mobile backhaul network covers a variety of technologies from BTS aggregation, pizza box backhaul, aggregation to transmission and mobile core network.

In addition, Bradley Howe, vice president of IC Engineering of Altera, also introduced the optical fiber interconnection programmable devices that are being developed and will be released at the end of the year. It can realize the optical interconnection of chip to chip, board to board and chip to backplane.

When the data transmission rate of existing copper interconnection is 10g ~ 30gbps, the signal loss will increase by about 3.5 times. At 30gbps, the circuit board material adopts FR4. Compared with megtron6, the cost caused by signal loss is 5 times that of the latter. On the high-speed backplane, the signal eye pattern generated by copper transmission will deteriorate sharply with the increase of frequency. Therefore, in the actual circuit design, the problem of PCB must be considered.

The optical fiber interconnection programmable device can greatly reduce the signal loss, solve the signal integrity problem, increase the transmission distance, make the wiring easier and reduce the PCB cost. However, although optical interconnection can provide almost unlimited bandwidth, the cost at this stage is still very high. Howe said that with the increase of application scale in the future, the device cost can soon be reduced to the economic level.

For optical interface, transceiver technology is particularly critical, and its rate and signal integrity are important. Altera’s 28gbps transceiver can meet this requirement.


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