Abstract
Packet duplication (PD) with dual connectivity (DC) was newly introduced in the 5G New Radio (NR) specifications to meet the stringent ultra reliable low latency communication (URLLC) requirements. PD technology uses duplicated packets in the packet data convergence protocol (PDCP) layer that are transmitted via two different access nodes (ANs) to the user equipment (UE) in order to enhance the reliability performance. However, PD can result in unnecessary retransmissions in the lower layers since the hybrid automatic retransmission request (HARQ) operation is unaware of the transmission success achieved through the alternate DC link to the UE. To overcome this issue, in this paper, a novel duplication-aware retransmission optimization (DRO) scheme is proposed to reduce the resource usage induced by unnecessary HARQ retransmissions. The proposed DRO scheme can minimize the average channel use while satisfying the URLLC requirements. The proposed DRO scheme derives the optimal HARQ retransmission attempts for different ANs by solving a nonlinear integer programming (NLIP) problem. The performance of the proposed DRO scheme was evaluated using MATLAB simulation and is compared to the existing 5G HARQ support schemes. The simulations results show that the proposed DRO scheme can provide a 14.71% and 15.11% reduced average channel use gain compared to the selective data duplication upon failure (SDUF) scheme and latency-aware dynamic multi-connectivity algorithm (LADMA) scheme, respectively, which are the existing 5G PD schemes that use HARQ.
Highlights
Ultra reliable low latency communication (URLLC) is one of the fifth generation (5G) mobile service modes that can support high reliability wireless networking with very low time delays
The performance of duplication-aware retransmission optimization (DRO) is compared to non-optimal retransmission control schemes such as selective data duplication upon failure (SDUF) and latency-aware dynamic multi-connectivity algorithm (LADMA), and the simulation results show that DRO can provide the lowest average channel use while satisfying the ultra reliable low latency communication (URLLC) requirements
In [6], a reliability-oriented multi-connectivity (MC) concept was proposed based on packet data convergence protocol (PDCP) duplication, which includes a novel admission mechanism to control the number of MC users
Summary
Ultra reliable low latency communication (URLLC) is one of the fifth generation (5G) mobile service modes that can support high reliability wireless networking with very low time delays. By duplicating URLLC packets in the PDCP layer and transmitting them through different ANs, an UE can obtain macro diversity. When duplicated packets are transmitted via different ANs, the packet delivered through one AN might be successful and the other packet sent through the other AN may be unsuccessful In this case, the HARQ process will not be needed, but HARQ will be executed since the HARQ entity would be unaware of the successful packet delivery through the other AN. The performance of DRO is compared to non-optimal retransmission control schemes such as selective data duplication upon failure (SDUF) and latency-aware dynamic multi-connectivity algorithm (LADMA), and the simulation results show that DRO can provide the lowest average channel use while satisfying the URLLC requirements
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