Who is behind the scenes of the 5G standard fragmentation?
Recently, the 3GPP ally was unable to sit still, picked up the 5G timetable, helped the reading glasses, and confirmed it again.
This timetable is the result of several nights of discussions among 3GPP members and is the crystallization of the collective wisdom of the global communications elite. Although it is just a simple timeline diagram, the amount of information behind it is quite large.
It first implies that 5G applications such as unmanned driving, telemedicine, smart factories, and large-scale IoT that are blown up in the sky are estimated to enter our lives by 2022.
Because the second phase of the 5G standard development work, that is, the second version of the 5G standard, 3GPP Release 16 is planned to be completed in March 2020, it takes another one or two years from the completion of the technical standard to the commercial landing, which is estimated to be 2022. about.
As for the first phase of the 5G standard development work, the first version of the 5G standard, 3GPP Release 15, is scheduled to be completed in September 2018, and the commercial estimate is expected to be around 2019.
Regarding this timetable, 3GPP is well thought out. Since it is a replacement, in the first stage, the first 5G needs the senior 4G to support the horse. Otherwise, the latter work is not good, at least the handover work can not be sloppy.
Therefore, the decision of 3GPP is to let 5G hang a deputy first. The specific work is mainly responsible for improving the network capacity to meet the increasing traffic demand of the people. The overall work arrangement is to listen to the old leader 4G comrades (5G NR in the control plane). Anchor 4G core network). This is called stability and growth.
Regarding the application of network slicing, large-scale object association, autonomous driving, telemedicine, etc. proposed by 5G comrades, the organization expressed that the idea is very good. Young people, it is a good thing to pursue progress. However, you can’t make a quick profit, and you should eat it bit by bit, otherwise The Jiangshan that Laozi has laid down may be abandoned. So, arrange these applications to the second stage.
However, some comrades have recently pursued a very strong heart of progress. Within the 3GPP organization, there has been a serious disagreement about when the 5G will be on the top.
The first thing to pick is the US operator Verizon.
The company first announced the establishment of a coalition, the 5G Open Trial SpecificaTIon Alliance, in conjunction with South Korea's KT and SK Telecom and Japan's NTT DOCOMO.
Then I did a bit too much, completely ignoring the organization, grabbed the Verizon version of the 5G standard (V5G) in front of 3GPP, and had a self-supporting portal.
Of course, it is one thing to engage in ghosts in private, but the external rhetoric is high-sounding – we are consistent with 3GPP, in order to better promote the maturity of the 5G standard.
But is the 5G standard of V5G and 3GPP consistent? Not also.
Let's first compare the difference between V5G and LTE on the physical layer.
â— OFDM is used in both uplink and downlink, and uplink SC-FDMA is abandoned.
â— The frame structure also adopts a 10ms frame length and is divided into 50 subframes, but the subframe length is shorter, which is reduced from 1ms of LTE to 0.2ms, which shortens the delay.
â— Single carrier bandwidth is 100MHz, which is 5 times that of LTE. In addition, support for 8-carrier aggregation up to 800MHz bandwidth.
â— FDD is not supported and only dynamic TDD is supported.
â— The modulation code abandons the Turbo code and uses the LDPC code, which is basically the same as the 5G standard.
â— The subcarrier spacing is 75KHz.
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