SCIENCE CHINA Information Sciences, Volume 60, Issue 10: 100305(2017) https://doi.org/10.1007/s11432-017-9196-0

## Aggregation transmission scheme for machine type communications

• AcceptedAug 2, 2017
• PublishedSep 1, 2017
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### Abstract

Massive amount of small data generated by machine type communications (MTC) will pose a challengeto the future fifth generation (5G) wireless network. Since the information from or to the machine type users aggregating closely are highly correlated, the relevance of data can be excavated by big data analysis to help improve the spectral efficiency. In this paper we proposed an aggregation transmission scheme (ATS) for MTC downlink transmissions in which the transmission order of users' data packets can be adjusted according to their relevance under the delay constraints. The users having relevance will temporally share the time slots and their data are transmitted in a multicast way so that much less timeslots are needed. We propose three different algorithms, conditional random search (CRS), standard-row algorithm (SRA), and genetic algorithm (GA) to tackle the problem of transmission order adjustment. Simulation results validate the good performance of ATS and demonstrate that SRA has the lowest complexity while GA may achieve a better performance. We also analyze the impact of different delay requirements. Our work sheds light on dealing with massive MTC data traffic for future wireless communications.

### Acknowledgment

This work was partially supported by Natural Science Foundation of China (Grant No. 61461136002), Key Program of National Natural Science Foundation of China (Grant No. 61631018), Fundamental Research Funds for the Central Universities, and Huawei Innovation Research Program.

• Figure 1

• Figure 2

Flow chart for SRA.

• Figure 3

Example of a chromosome.

• Figure 4

Single point crossover.

• Figure 5

Performance of different algorithms with $K=8$.

• Figure 6

Performance of different algorithms with $M=32,~N=256$.

• Figure 7

Gain ratio with different degree of delay requirements.

•

Algorithm 1 Standard-row algorithm

Input: $M$, $N$, $K$

Output: $\boldsymbol{\widetilde{I}}$, $\boldsymbol{\widetilde{D}}$

for $m~=~1,2,\ldots,M$ do

for $k~=~1,2,\ldots,K$ do

Sample $B_{m}^{k}$

Sample $d(B_{m}^{k})$

$\boldsymbol{\widetilde{I}}=\boldsymbol{I}$, $\boldsymbol{\widetilde{D}}=\boldsymbol{D}$

for $m~=~1,2,\ldots,M$ do

for $k~=~1,2,\ldots,K$ do

$\boldsymbol{D}'[m][k]~=~\boldsymbol{D}[m][k]~-~k$

let $\sum_{k~=~1}^K~\boldsymbol{D}'[a][k]$ be the minimum

while $u<M$ do

if $u\neq~a$ then

for $k~=~1,2,\ldots,K$ do

for $kk~=~1,2,\ldots,K$ do

if $\boldsymbol{I}[u][k]~==~\boldsymbol{I}[a][kk]$ then

$interval~=~kk~-~k$

if $0<~interval~~\leq~\boldsymbol{D}'[u][k]$ then

$\boldsymbol{\widetilde{I}}[u][k]~=~\boldsymbol{I}[u][kk]~$

$\boldsymbol{\widetilde{I}}[u][kk]~=~\boldsymbol{I}[u][k]$

$\boldsymbol{\widetilde{D}}[u][k]~=~\boldsymbol{D}'[u][kk]~+~interval+k$

$\boldsymbol{\widetilde{D}}[u][kk]~=~\boldsymbol{D}'[u][k]~-~interval+kk$

if $interval~\leq~0$, $|interval|\leq~\boldsymbol{D}'[u][k]$ then

$\boldsymbol{\widetilde{I}}[u][k]~=~\boldsymbol{I}[u][kk]$

$\boldsymbol{\widetilde{I}}[u][kk]~=~\boldsymbol{I}[u][k]$

$\boldsymbol{\widetilde{D}}[u][k]~=~\boldsymbol{D}'[u][kk]~+~interval+k$

$\boldsymbol{\widetilde{D}}[u][kk]~=~\boldsymbol{D}'[u][k]~-~interval+kk$

$kk~\leftarrow~kk~+~1$

$k\leftarrow~k~+~1$

$u~\leftarrow~u~+~1$

end while

$\boldsymbol{\widetilde{I}}$, $\boldsymbol{\widetilde{D}}$

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