Abstract
Evolution in cellular wireless communication and standardization has brought out technological advancements in physical and medium access (MAC) layer protocol to scale the data rate on the air interface like in Long Term Evolution (LTE) or New Radio (NR) 3GPP standards, by 10X to 100X compared to ol
Highlights
With advancement in wireless communication, we have seen various cellular standards starting from 1G to 5G focusing on Throughput (TP) improvement, latency reduction, enhanced coverage and increased system capacity
In a 3rd Generation Partnership Project (3GPP) based cellular network, e.g. Long Term Evolution (LTE), Transmission Control Protocol (TCP)/Internet Protocol (IP) Packet is mapped to corresponding Packet Data Convergence Protocol (PDCP) and Radio Link Control (RLC) Protocol Data Units (PDUs) [2][3]
The scheme does not allocate Sequence Number (SN) to UL packets, i.e. TCP non-ACK packets related to UL traffic or TCP ACK packets acknowledging the DL traffic, as they arrive in the UL packet queue from the application
Summary
With advancement in wireless communication, we have seen various cellular standards starting from 1G to 5G focusing on Throughput (TP) improvement, latency reduction, enhanced coverage and increased system capacity. In a 3rd Generation Partnership Project (3GPP) based cellular network, e.g. Long Term Evolution (LTE), TCP/IP Packet is mapped to corresponding Packet Data Convergence Protocol (PDCP) and Radio Link Control (RLC) PDU [2][3]. Both PDCP and RLC allocates sequence numbers to these packets in their order of arrival. When eNodeB (eNB) scheduler allocates Uplink (UL) grant, i.e. frequency-time resource, the User Equipment (UE) prepares a MAC Transport Block (TB) using RLC PDUs. In case of bi-directional traffic scenario with high UL traffic, the Sequence Number (SN) allocated to the TCP ACK for the corresponding Downlink (DL) packet will be after large gaps, i.e. farther in SN space. SN reservation for TCP ACKs with advance packet creation scheme
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