# 6G Mobile Networks: Key Technologies, Directions, and Advances
## 3 6G Market Overview and Current Status
AT&T and Ericsson's executives were elected to spearhead the campaign to position North America as a pioneer in 6G networks for the US industry. The Next G Alliance, which comprises Ericsson, AT&T, Verizon, Samsung, Microsoft, and other companies, was announced by the Alliance for Telecommunications Industry Solutions in October 2020. Over the next ten years, the alliance wants to strengthen North America's position as a global leader in mobile communications. China just sent the first 6G test satellite into space, which has caused a rush of interest in the field. For instance, China successfully launched a test satellite for 6G networks and about 12 other satellites into orbit on 6 November 2020, using a Long March 6 launch system rocket. The Minister of Communication in India also said that 6G technology would be used by 2024. However, by building a higher frequency spectrum, 6G networks are able to give high-speed access to the network; additionally, higher-throughput satellite communication services are used to provide extensive coverage in remote and isolated places [19]. For the 6G network, innovative service classes are identified and explained in the following sections:  
1. Massive URLLC: The acronym URLLC stands for communications with increased availability, reduced delay, and reliability for critical applications like the industrial internet of things and remote surgery. Massive-URLLC is a new service class that combines traditional mMTC with 5G-URLLC. It will come about because 6G will need to make the 5G URLLC service huge. One of the applications for huge URLLC that some want to deploy is autonomous intelligent driving (AID). AID necessitates juggling many priorities at once, including obstacle detection, automatic driving, motion planning, and others. Interesting alternatives to Massive-URLLC include multiple access techniques like OMA, NOMA, and assertion of multiple access. By using OMA techniques like massive-URLLC, the amount of bandwidth required for 6G might grow exponentially as more devices are added. Other multiple access techniques, such as NOMA, can be used to strike the ideal balance between scalability, reliability, and latency. Massive-URLLC demands the delivery of a lot of little data packets for \"time-critical\" 6G applications to ensure high resource efficiency and low latency [20]. 2. eMBB: Applications like holographic meetings, AR, and VR often require fast transmission speeds, minimal latency, and great reliability. Additionally, these demands must be met in situations demanding a great deal of mobility, including sea and air travel. As a result, the following new service class for 6G has proposed an enhanced mobile broadband URLLC. For this service class, the importance of energy-efficiency is a priority. In comparison to the URLLC along with eMBB in 5G networks, this new network class should be extremely skilled in improving mobile communications networks, with regard to handover, interference, and huge data transmission and processing. Additionally, the improved mobile broadband URLLC communication service's security and privacy issues need to be considered [20]. Massive eMBB--The link frequency will be quite high in Industry 4.0-based scenarios in order to acquire tactile perceptions and convert them into digital data. As a result, big eMBB will be a hot topic in the 6G network as a way to improve large-scale IIoT operations and functionalities by enabling the vast connection between worker, sensor, and an actuator that has low-latency[20]. As a result of technological advancements and intelligent autonomous driving novel key service classes will emerge the network of the future. There are several advantages of 6G network over 5G network[21] as explored below:  
1. Frequency Bands--For fixed access, 5G provides millimeter wave and sub-5 GHz frequency bands. While 6G enables sub-6 GHz frequency bands, millimeter waves for mobile communication investigation of THz bands, non-RF bands, etc. 2. Data Rate--20 Gbps downlink and 10 Gbps uplink data rates are provided by 5G.