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Authors
Advisor(s)
Abstract(s)
This paper proposes two strategies for retransmission
control of backlog traffic in the family of algorithms known
as Network Diversity Multiple Access (NDMA). This type of
algorithm has been shown to achieve (in ideal conditions) the
following aspects: 1) collision-free performance for contentionbased
traffic, 2) low latency values, and 3) reduced feedback
complexity. These features match the machine-type traffic, realtime,
and dense object connectivity requirements in 5G. This
makes NDMA a candidate for contention traffic support in 5G
systems. However, existing analysis ignores the effects of backlog
traffic generated by the imperfect detection conditions that arise
in settings with finite Signal-to-Noise Ratio (SNR). This paper
aims to partially fill this gap, by providing analytic expressions for
the performance of symmetrical training-based NDMA protocols
with two different types of backlog traffic retransmission schemes.
In the first strategy, all terminals involved in an unsuccessful resolution
period retransmit immediately in the subsequent resolution
periods or epoch slots. This procedure is repeated continuously
(persistent retransmission) by inducing the same collision event
under different channel outcomes until all the contending signals
are correctly detected and received. In the second retransmission
strategy, the terminals in backlog state retransmit at a randomly
selected time-slot with a probability that that is assumed (for
simplicity) to match the transmission rate of the system. In
both strategies, expressions are here obtained of the maximum
stable throughput and the average delay experienced by any
packet to be correctly received by the destination. This allows
us to determine the capabilities of NDMA for achieving lowlatency,
reduced feedback complexity, as well as highly stable
and real-time throughout performance. The results shown here
suggest that NDMA can achieve attractive low latency and high
throughput figures mainly at high SNR values and moderate
traffic loads.
Description
The Second International Conference on Advances in Signal, Image and Video Processing - from Sensing to Applications (SIGNAL 2017). 21 to 25, May, 2017, 5Gsignalwave. Barcelona, Spain.
Keywords
Multiple Access in 5G Retransmission Diversity Signal Processing Multi-User Detection Cross-layer Design Random Access Multi-Packet Reception