TY - JOUR
T1 - Impact of NOMA on Age of Information
T2 - A Grant-Free Transmission Perspective
AU - Ding, Zhiguo
AU - Schober, Robert
AU - Poor, H. Vincent
N1 - Publisher Copyright:
© 2002-2012 IEEE.
PY - 2024/5/1
Y1 - 2024/5/1
N2 - The aim of this paper is to characterize the impact of non-orthogonal multiple access (NOMA) on the age of information (AoI) of grant-free transmission. In particular, a low-complexity form of NOMA, termed NOMA-assisted random access, is applied to grant-free transmission in order to illustrate the two benefits of NOMA for AoI reduction, namely increasing channel access and reducing user collisions. Closed-form analytical expressions for the time average AoI achieved by NOMA assisted grant-free transmission are obtained, and asymptotic studies are carried out to demonstrate that the use of the simplest form of NOMA is already sufficient to reduce the AoI of orthogonal multiple access (OMA) by more than 40%. In addition, the developed analytical expressions are also shown to be useful for optimizing the users' transmission attempt probabilities, which are key parameters for grant-free transmission.
AB - The aim of this paper is to characterize the impact of non-orthogonal multiple access (NOMA) on the age of information (AoI) of grant-free transmission. In particular, a low-complexity form of NOMA, termed NOMA-assisted random access, is applied to grant-free transmission in order to illustrate the two benefits of NOMA for AoI reduction, namely increasing channel access and reducing user collisions. Closed-form analytical expressions for the time average AoI achieved by NOMA assisted grant-free transmission are obtained, and asymptotic studies are carried out to demonstrate that the use of the simplest form of NOMA is already sufficient to reduce the AoI of orthogonal multiple access (OMA) by more than 40%. In addition, the developed analytical expressions are also shown to be useful for optimizing the users' transmission attempt probabilities, which are key parameters for grant-free transmission.
KW - age of information (AoI)
KW - grant-free transmission
KW - Non-orthogonal multiple access (NOMA)
UR - http://www.scopus.com/inward/record.url?scp=85165600916&partnerID=8YFLogxK
U2 - 10.1109/TWC.2023.3313612
DO - 10.1109/TWC.2023.3313612
M3 - Article
AN - SCOPUS:85165600916
SN - 1536-1276
VL - 23
SP - 3975
EP - 3989
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 5
ER -