Shaping Future 6G Networks. Группа авторов

[3].

      This will eventually result in a new IMT requirements definition, which will be available for the industry.

3.3 IMTs Have Driven Multiple Approaches to Previous Mobile Generations

      Previous generations of mobile technology have also been kick‐started by the agreement of a relevant IMT. While IMT‐2020 led to 5G and an agreed, unified approach spearheaded by the 3GPP, earlier IMTs have given rise to different approaches to achieve the same desired outcomes.

      For example, IMT‐Advanced provided requirements for the 4th generation of mobile technology (4G), but there were several approaches that could have met these. Long‐term evolution – otherwise known as “LTE” – was just one example; Mobile WiMAX and Ultra Mobile Broadband, among others, were, for several years, considered as viable alternatives, although only two remained as candidate systems – LTE and Mobile WiMAX [4]. Similarly, the earlier IMT‐2000 recommendations, which gave rise to 3G, also generated several different candidate solutions, some of which saw commercial operation.

      3GPP was originally founded in 1998, with the aim of bringing together a number of foundational partners to collaborate on common standards to meet the requirements of IMT‐2000 and the realization of what became known as 3G [5]. 3GPP based its efforts on the evolution of the existing GSM (the Global System for Mobile Communications) standards for 2G, originally driven through the European Telecommunications Standards Institute, or ETSI. The partnership agreement brought together organizations that had previously, either individually or via different collaboration groups, contributed to earlier generations of mobile technology.

      3GPP’s efforts resulted in a set of standards for 3G – the Universal Mobile Telecommunications System (UMTS) – whose work has ultimately led to today’s 5G. However, a parallel organization (3GPP2) shadowed the work of the original 3GPP during this period, considering the perspectives of a different group of stakeholders, some of which proposed alternative candidates for 3G, such as CDMA2000, to meet the same IMT‐2000 requirements.

      CDMA2000 was adopted in the United States, South Korea, Japan, China, and Canada, for example, but saw little deployment outside these countries, as most nations favored the UMTS standards defined by 3GPP. 3GPP2 subsequently pursued initiatives to create standards for the 4th generation of mobile; however, these met with little success, because, as far as IMT‐Advanced is concerned, LTE won the race and became the default commercial vehicle for 4G.

The alternatives also failed to gather significant commercial momentum (although some such as Mobile WiMAX did reach deployment in several countries) and, eventually, fell by the wayside. Different approaches to IMTs are illustrated in Figure 3.1.

Figure 3.1 IMTs and different generations of mobile network technology.

      As a result, 3GPP2 effectively ceased operations in around 2013 and is now a dormant organization. This latter point may be highly significant for the future, as we shall see.

      Even before this, while GSM had been promoted for 2G by ETSI, other approaches had been developed by alternative standards organizations, resulting in multiple 2G standards that enjoyed widespread adoption for a long period of time.

5G is thus something of an anomaly in the history of the mobile industry, as it represented a coordinated, single global approach to the realization of the IMT‐2020 demands. For each previous generation, there was not, at the outset, necessarily an obvious winner or a single unified approach. Will 6G see a return to such a situation, or will a global effort prevail? There are many reasons to think that 6G could well lead to fragmentation in mobile standardization. Why?

3.4 Stakeholder Ecosystem Fragmentation and Explosion

      3GPP is currently the main body pushing forward with the evolution of 5G standards, but it has expanded considerably in recent years. What has driven that expansion and what might this mean for the long path towards 6G, currently being driven by early‐stage discussions in working groups of the ITU?

      Since 1998, 3GPP has expanded considerably, growing from an initial five “organizational partners” and six “market representation partners.” Organizational partners are different telecommunications standard development organizations (SDOs). Currently, there are seven SDOs: Association of Radio Industries and Businesses (ARIB) and Telecommunication Technology Committee (TTC) (Japan), Telecommunications Standards Development Society India (TSDSI) (India), European Telecommunications Standards Institute (ETSI) (Europe), China Communications Standards Association (CCSA) (China), Alliance for Telecommunications Industry Solutions (ATIS) (USA), and Telecommunications Technology Association (TTA) (Korea) [6]. Market representation partners are groups representing industry and sector interests. There are 21 market representation partners, including the GSMA. Each of these has, in turn, many of its own members.

      Significantly, the number of market representatives has continued to grow in recent years, with new organizations that represent the specific interests of vertical industries entering the fray. Examples include 5GACIA (the 5G Alliance for Connected Industries and Automation), 5GAA (5G Automotive Association), 5G Americas, PSCE (Public Safety Communication Europe Forum), CSAE (China Society of Automotive Engineers), and others. Each of these is thus now equivalent, in status at least, with the GSMA, which has been seen as the most significant industry group for many years. No longer – which could mean new pressures emerge that disrupt the unified approach to realizing IMTs.

Finally, there are also “observer” members, which may be new national or international SDOs that are candidates for future elevation to organizational partner status. While 3GPP has accomplished much in becoming the primary organization responsible for leading mobile standardization initiatives, it is an increasingly complicated and rapidly growing body.

      Of course, on the one hand this growth speaks for the strength of the industry and the alignment that has been achieved, particularly since IMT‐Advanced was brought to fruition. On the other, it points also to an increasingly diverse spectrum of views. 3G and 4G developments were largely driven by a combination of vendor, operator, and regulator interests, with additional contributions from integrators and academia, and with the goal of realizing mobile telecommunications standards primarily for people and devices. It was a relatively simple and well‐defined community. 5G has now brought a dramatic change to this ecosystem, expanding the focus to new sectors that can benefit from wireless communications. Why, and what might it mean for 6G?

      5G is the first generation of mobile technology to have been designed, from the outset, to support multiple services. This was supported by a phased implementation. First, enhanced mobile broadband (eMBB) services were launched by many operators, using 5G spectrum but also leveraging existing core assets. eMBB services are largely dedicated to personal use, for consumer and business customers, and support the standard range of mobile capabilities (data, voice, and messaging services) but with enhanced performance.

      However, the second phase brought new services that can be run on 5G networks in parallel with eMBB – massive IoT (MIoT) and Ultra‐Reliable Low‐Latency Communications (URLLC). It is these new services that have driven the most profound changes to the mobile ecosystem.

      That is because, while eMBB could be said to be “people‐driven,” MIoT and URLLC are largely “device‐driven” [7].

      The new capabilities that 5G (Phase 2) brings are designed to service new levels of performance for connected things and processes. So, while there are undoubtedly many exciting and novel applications and services that can be enabled for people, there are expected to be many, many more for devices and applications, across multiple industries and sectors.