# American Institute of Mathematical Sciences

November  2018, 12(4): 681-690. doi: 10.3934/amc.2018040

## The results on optimal values of some combinatorial batch codes

 1 Information Department, Children's Hospital of Hebei Province, Shijiazhuang 050031, China 2 College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024, China

* Corresponding author: Gengsheng Zhang

Received  May 2017 Revised  March 2018 Published  September 2018

Fund Project: This research is partially supported by National Natural Science Foundation of China (Grant No. 11571091), Natural Science Foundation of Hebei Education Department (Grant No. ZD2016096) and Research Project of Health Commission of Hebei Province (Grant No. 20160419).

An $(n,N,k,m)$-combinatorial batch code (CBC) was defined by Paterson, Stinson and Wei as a purely combinatorial version of batch codes which were first proposed by Ishai, Kushilevitz, Ostrovsky and Sahai. It is a system consisting of $m$ subsets of an $n$-element set such that any $k$ distinct elements can be retrieved by reading at most one (or in general, $t$) elements from each subset and the number of total elements in $m$ subsets is $N$. For given parameters $n,k,m$, the goal is to determine the minimum $N$, denoted by $N(n,k,m)$.

So far, for $k≥5$, $m+3≤ n< \binom{m}{k-2}$, precise values of $N(n,k,m)$ have not been established except for some special parameters. In this paper, we present a lower bound on $N(n,k,k+1)$, which is tight for some $n$ and $k$. Based on this lower bound, the monotonicity of optimal values of CBC and several constructions, we obtain $N(m+4,5,m)$, $N(m+4,6,m)$ and $N(m+3,7,m)$ in different ways.

Citation: Yuebo Shen, Dongdong Jia, Gengsheng Zhang. The results on optimal values of some combinatorial batch codes. Advances in Mathematics of Communications, 2018, 12 (4) : 681-690. doi: 10.3934/amc.2018040
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