It has been recently claimed that D2D communication in LTE-A (Rel 12+) will establish direct communication with the device in its proximity (UE) and can have many potential advantages e.g., increased network spectral efficiency, energy efficiency, reduced transmission delay, offloaded traffic for BS and less congestion in cellular core network. In contrast, there are various anticipated challenges, for example Device discovery. D2D session setup, D2D resource allocation, D2D MIMO transmission and D2D-aided BS deployment in HetNets (Heterogeneous Networks).
Keeping this in view, can somebody shed light on possible differences between D2D communication and existing wireless transmission techniques such as WiFi Direct, Bluetooth, UWB? How is it different than these existing ones?
Device-to-Device communication (D2D) will allow direct packets transmission between peers without routing the traffic via cellular base station nor a switching core. The main difference between D2D and other direct technologies is that the former is subject to a set of Quality of Service rules mandated by the telecom operator, unlike other technologies (WLAN, Zigbee, Bluetooth) that are based on "best effort" communications. Another point is the the "cellular underlay" nature of D2D delegates the telecom operator to perform the needed authentications of users (when possible), thus adding more flexibility and security.
here are few speculated differences in my opinion
D2D communication in cellular networks is defined as direct communication between two mobile users without traversing the Base Station (BS) or core network.
D2D communication could be generally non-transparent to the cellular network and it can occur on cellular spectrum (i.e., inband) or unlicensed spectrum (i.e., outband).
Yes, there are two modes of D2D communication which are network-assisted D2D communication and without network-assistance D2D communication. Moreover, it uses licensed cellular spectrum and is prone to security issues specially when it operates in a mode that does not involve network assistance.
Device-to-Device communication (D2D) will allow direct packets transmission between peers without routing the traffic via cellular base station nor a switching core. The main difference between D2D and other direct technologies is that the former is subject to a set of Quality of Service rules mandated by the telecom operator, unlike other technologies (WLAN, Zigbee, Bluetooth) that are based on "best effort" communications. Another point is the the "cellular underlay" nature of D2D delegates the telecom operator to perform the needed authentications of users (when possible), thus adding more flexibility and security.
A non negligible difference (for operators) is that several D2D communications may be scheduled on the same time/frequency resources, if the respective receivers are far enough as not to perceive interference. On the user side, proximity may warrant lower transmission powers (i.e., battery savings).
D2D communication is supposed to save power and delay. LTE aims at device to device communication without packets having to move all the way to node B.
Existing technologies may be used for just file transfer controlled by devices in participation without considering network conditions.
But D2D have a lot more than that including QoS, Security, Routing, Interference etc... under the control of network which shall reduce the interference and increase overall throughput with minimum energy.
If someone could answer what @ Matthias R. Brust put here.thanks
I think the main issue here for D2D communication is the interference management. It is correct that the devices in D2D can directly communicating in similar way as other Ad hoc wireless networks. But there is one major difference here, that in D2D the communication can be performed under the control of the network. The signalling of D2D communication is still controlled by the network, therefore, it is possible to select for example the subbands or time of transmission in order to manage the interference levels with the Up/Down links of the network. The network also observe the quality of communication and the packets could be redirected over the the network if needed. This could enhance the reliability of the system.
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