5G Development Focus


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    Multi RAT Design Consideration with Front Haul (DU) and Backhaul (RU)

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5G RAN architecture and functional design

5G RAN architecture is designed based on the extreme mobile broadband (xMBB), massive machine-type communications (mMTC) and ultra-reliable machine-type communications (uMTC), as well as the five specific use cases. 5G RAN is service delivery architecture designed to support multiple services such as Gaming, AR/VR, Non-Real Time and Real Time applications delivery.

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Split Architecture

PHY Layer blocks of modulation, channel coding, waveform mapping etc. would ideally be interchangeable through parameterization or (de-) activation of certain features. In other words, there would be a physical or logical implementation that supports easy switching between different variants, and even their multiplexing in time, frequency and/or space. Physically separate baseband processing chains (with potentially different / parallel transmission circuitries) may be required for different services, bands or cell types. Split 1 to Split 8 implementation at the RAN and Protocol layers are very important. The PDCP layer is currently seen as a viable option of UP aggregation between LTE-A evolution and novel 5G AIVs [SMR+15 · Single RRC: a single RRC instance exists at the UE and at the RAN either for the new 5G AI or for the evolved LTE-A; · Dual RRC: two RRC instances exist at the UE and at the RAN, one for the new 5G AI and another for the evolved LTE-A.

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