Wu Hequan: fiber optic communications will play a greater role in the 5G era
In the recently held "2018 IMT-2020 (5G) Summit", Wu Hequan, academician of the Chinese Academy of Engineering, said that 5G will redefine the new applications of information technology, promote the convergence of mobile network and fixed network technology, fiber optic communication technology will play a greater role in the 5G era. He believes that WDM-PON will play a major role in the fiber optic pre-transmission and mid-transmission systems of 5G.(Cite this article as: http://www.eepw.com.cn/article/201806/382011.htm)
"The dense networking of 5G base stations requires a large number of optical fibers, and the pre-transmission and mid-transmission and backhaul of 5G's radio access network puts forward high-bandwidth and low-latency requirements for optical fiber transmission systems." According to Wu Hequan, "WDM-PON will play a major role in the fiber optic pre-transmission and mid-transmission system of 5G, and TSN, a delay-sensitive network that is improved on the basis of Ethernet, can realize statistical multiplexing of user data streams at the base station, which improves the transmission rate."
"CPRI, the current de facto standard for point-to-point pre-transmission interfaces at macro base stations, transmits modulated radio signals at a fixed rate in a TDM manner and independent of the actual user service, which requires excessive bandwidth and is inflexible in the case of massive MIMO. Considering scenarios such as massive MIMO, carrier aggregation, multi-band applications, coexistence of multiple cell sizes, and concentration on virtual RANs, IEEE 1914.1 is defining the Ethernet-based Forward Interface NGFI (Next Generation Forward Interface)." Wu pointed out that "NGFI uses Ethernet packetized CPRI signals, but it needs to address the uncertainty of packet communication with imprecise time synchronization," so it needs to use TSN, ROE and other technologies.
Wu Hequan believes that 5G MIMO layer is usually not all independent, can be grouped by antenna to improve the wireless channel throughput, while the throughput of the air interface with the actual situation of the wireless channel, the use of the TDM method is inefficient. 5G pre-transmission bandwidth is high, the air interface delay and time synchronization accuracy is ten times more stringent than 4G from the stringent, but also to consider the network slicing support.
"5G if the statistical multiplexing mechanism of Ethernet is used, can dynamically adapt to the traffic situation, and converge the services of multiple base stations, but the traditional Ethernet bandwidth is narrow, low efficiency and poor real-time." Wu said that TSN retains the Ethernet statistical multiplexing characteristics and adds new features.
It uses standard Ethernet components, improves the data link layer protocol, and provides preemption for high-priority frames according to the QOS level; TSN inherits many of the features of existing Ethernet, such as the HTTP interface and Web services, and implements the remote diagnosis, visualization, and repair functions required for IIoT systems; it can communicate across multiple layers, and can realize the convergence of OT and IT to provide high-reliability low-latency services in the industrial, automotive networking, and 5G Provides highly reliable and low-latency services in industrial, automotive and 5G; TSN can utilize mass-produced commercial chips just by utilizing standard Ethernet chipsets, thus reducing the cost of components.
Wu Hequan further said, "5G uses TSN to provide a next-generation forward interface (NGFI) to achieve RoE, using a packet approach that allows the forward interface to work on a multipoint-to-multipoint connection. roe can adaptive bandwidth in response to changes in load, allowing the interface to decouple the service flow and the number of antennas, and supporting deterministic service flow scheduling, packet packet encapsulation and wireless domain synchronization. "
In addition, Wu Hequan believes that with the significant increase in 5G sites, it will lead to a very tight pre-transmission/mid-transmission fiber resources from the antenna to the server room, and there is a need to save fiber resources to achieve low-cost deployment of 5G networks. Among the multiple options such as direct fiber connection, active DWDM, WDM-PON, OTN, etc., WDM-PON is more suitable for 5G RAN.
WDM-PON is a point-to-multipoint technology that saves fiber; for each connection, WDM-PON is logically point-to-point again, and can exclusively share a wavelength with a bandwidth of up to 25Gbps; WDM-PON is passive in the middle and has only one hop, which has the lowest delay compared to the multiple hops of a ring network; replacing the splitter with a splitter reduces the loss and obtains a longer transmission distance; and in terms of network management, the The use of AMCC signaling top technology, management channel superimposed on each wavelength.
Finally, Wu Hequan stressed that 5G standardization is still in progress, there are still many challenges that have not yet been resolved, and 5G innovation is always on the road.
Welcome visit our website in China for learns more —— www.metafiber.com
Wu Hequan: fiber optic communications will play a greater role in the 5G era
In the recently held "2018 IMT-2020 (5G) Summit", Wu Hequan, academician of the Chinese Academy of Engineering, said that 5G will redefine the new applications of information technology, promote the convergence of mobile network and fixed network technology, fiber optic communication technology will play a greater role in the 5G era. He believes that WDM-PON will play a major role in the fiber optic pre-transmission and mid-transmission systems of 5G.(Cite this article as: http://www.eepw.com.cn/article/201806/382011.htm)
"The dense networking of 5G base stations requires a large number of optical fibers, and the pre-transmission and mid-transmission and backhaul of 5G's radio access network puts forward high-bandwidth and low-latency requirements for optical fiber transmission systems." According to Wu Hequan, "WDM-PON will play a major role in the fiber optic pre-transmission and mid-transmission system of 5G, and TSN, a delay-sensitive network that is improved on the basis of Ethernet, can realize statistical multiplexing of user data streams at the base station, which improves the transmission rate."
"CPRI, the current de facto standard for point-to-point pre-transmission interfaces at macro base stations, transmits modulated radio signals at a fixed rate in a TDM manner and independent of the actual user service, which requires excessive bandwidth and is inflexible in the case of massive MIMO. Considering scenarios such as massive MIMO, carrier aggregation, multi-band applications, coexistence of multiple cell sizes, and concentration on virtual RANs, IEEE 1914.1 is defining the Ethernet-based Forward Interface NGFI (Next Generation Forward Interface)." Wu pointed out that "NGFI uses Ethernet packetized CPRI signals, but it needs to address the uncertainty of packet communication with imprecise time synchronization," so it needs to use TSN, ROE and other technologies.
Wu Hequan believes that 5G MIMO layer is usually not all independent, can be grouped by antenna to improve the wireless channel throughput, while the throughput of the air interface with the actual situation of the wireless channel, the use of the TDM method is inefficient. 5G pre-transmission bandwidth is high, the air interface delay and time synchronization accuracy is ten times more stringent than 4G from the stringent, but also to consider the network slicing support.
"5G if the statistical multiplexing mechanism of Ethernet is used, can dynamically adapt to the traffic situation, and converge the services of multiple base stations, but the traditional Ethernet bandwidth is narrow, low efficiency and poor real-time." Wu said that TSN retains the Ethernet statistical multiplexing characteristics and adds new features.
It uses standard Ethernet components, improves the data link layer protocol, and provides preemption for high-priority frames according to the QOS level; TSN inherits many of the features of existing Ethernet, such as the HTTP interface and Web services, and implements the remote diagnosis, visualization, and repair functions required for IIoT systems; it can communicate across multiple layers, and can realize the convergence of OT and IT to provide high-reliability low-latency services in the industrial, automotive networking, and 5G Provides highly reliable and low-latency services in industrial, automotive and 5G; TSN can utilize mass-produced commercial chips just by utilizing standard Ethernet chipsets, thus reducing the cost of components.
Wu Hequan further said, "5G uses TSN to provide a next-generation forward interface (NGFI) to achieve RoE, using a packet approach that allows the forward interface to work on a multipoint-to-multipoint connection. roe can adaptive bandwidth in response to changes in load, allowing the interface to decouple the service flow and the number of antennas, and supporting deterministic service flow scheduling, packet packet encapsulation and wireless domain synchronization. "
In addition, Wu Hequan believes that with the significant increase in 5G sites, it will lead to a very tight pre-transmission/mid-transmission fiber resources from the antenna to the server room, and there is a need to save fiber resources to achieve low-cost deployment of 5G networks. Among the multiple options such as direct fiber connection, active DWDM, WDM-PON, OTN, etc., WDM-PON is more suitable for 5G RAN.
WDM-PON is a point-to-multipoint technology that saves fiber; for each connection, WDM-PON is logically point-to-point again, and can exclusively share a wavelength with a bandwidth of up to 25Gbps; WDM-PON is passive in the middle and has only one hop, which has the lowest delay compared to the multiple hops of a ring network; replacing the splitter with a splitter reduces the loss and obtains a longer transmission distance; and in terms of network management, the The use of AMCC signaling top technology, management channel superimposed on each wavelength.
Finally, Wu Hequan stressed that 5G standardization is still in progress, there are still many challenges that have not yet been resolved, and 5G innovation is always on the road.
Welcome visit our website in China for learns more —— www.metafiber.com
