Realtime streaming with guaranteed QoS over wireless D2D networks

Abstract

We consider a group of co-located wireless peer devices that desire to synchronously receive a live content stream. The devices are each equipped with an expensive unicast basestation-to-device (B2D) interface, as well as a broadcast device-to-device (D2D) interface over a shared medium. The stream is divided into blocks, which must be played out soon after their initial creation. If a block is not received within a specific time after its creation, it is rendered useless and dropped. The blocks in turn are divided into random linear coded chunks to facilitate sharing across the devices. We transform the problem into the two questions of (i) deciding which peer should broadcast a chunk on the D2D channel at each time, and (ii) how long B2D transmissions should take place for each block. We analytically develop a provablyminimum-cost algorithm that can ensure that QoS targets can be met for each device. We study its performance via simulations, and present an overview of our implementation on Android phones using the algorithm as a basis.

Optimal transmission for scalable video coded streaming in cellular wireless networks with the cooperation of local peer-to-peer network

“…The simulation result is shown in Figure 10, where x is the UE's subscript and y is the UE's reward. It can be found that the rewards of UEs (6)(7)(8)(9)(10), that are incapable of receiving data from the cellular network, increase with both the P2P transmission rate and the number of peers that provide relay service.…”

“…8,10,11,14 As discussed in section ''Video model,'' one video content consists of a sequence of a group of pictures/frames (GoPs). Accordingly, one common way is to perform RLC across all frames within one GoP, and then the resulting coded chunks are delivered to all users via the wireless networks.…”

“…The basic idea to decouple the cellular transmission and P2P transmission is to relax the time constraint (10), that is, to increase the value of a such that this constraint will become too relaxing, but other constraints can play more roles in finding an optimal solution. With this relaxation, the cellular transmission can be stopped before the first half of aT GoP , and the P2P transmission can be stopped before the second half.…”

“…To conquer this problem, network coding is often used in the broadcast/multicast scenarios. [10][11][12][13][14] In our work, we also adopt one of network coding approaches, namely, random linear coding (RLC), for encoding each video chunk by the base station (BS) or server. Different from the existing work where the BS unicasts videos to users, we employ broadcast in cellular transmission, where the transmission rate does not cater to the lowest receiving rate of UEs for broadcast efficiency.…”

Fast Cooperative Content Distribution over Hybrid Wireless Networks

“…In [7], [8], the dissemination process of video content is divide into two stages: download over cellular B2D links and dissemination over local D2D links. They transform the optimization problem into choosing a subset of mobile devices serving as gateways between cellular local D2D networks, and present dissemination schemes that provide guidelines for video content transmission among individual users.…”