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TR 22.821SA1
Feasibility Study on LAN Support in 5G

use "3GPP‑Page" to get the Word version
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V16.1.0 (Wzip)  2018/06  52 p.

WI Acronym:  FS_5GLAN
Rapporteur:  Mr. Nasielski, JackQualcomm CDMA Technologies

The present document describes new use cases and potential requirements applicable to the 5G system for a 3GPP network operator to support 5G LAN‑type services over the 5G system (i.e. UE, RAN, Core Network, and potential application to manage the LAN‑style service). In this context, 5G LAN‑type services with 5G capabilities (e.g. performance, long distance access, mobility, security) allow a restricted set of UEs to communicate amongst each other.

full Table of Contents for  TR 22.821  Word version:   16.1.0

Here   Top
1  ScopeWord-p. 8
2  References
3  Definitions, symbols and abbreviationsWord-p. 9
4  OverviewWord-p. 10
5  Use CasesWord-p. 11
5.1  Use case for enterprise 5G PVN
5.1.1  Description
Enterprises today use a variety of technologies to provide constant connectivity within an office or campus. For example, computers may have a fixed connection to the enterprise intranet to access local printers and copiers. WLAN may be used to provide intranet access from conference rooms or hallways as employees move about a building. Cellular access may be used to provide intranet access as employees move between buildings on a campus.
While 5G is designed to manage movement between access technologies, and even simultaneous connections to different access technologies as efficiently as possible, some challenges yet remain. Different access technologies are subject to different QoS constraints, which can impact service quality when a UE moves from one to another. Fixed access is subject to physical constraints that are not conducive to today's mobile workplace. Service continuity is a goal rather than a requirement when moving between 3GPP and non-3GPP access technologies.
Several technological advances have come together to make a 5G PVN feasible and practical. The emerging MIoT market is introducing office equipment that supports multiple access technology. For example, most new printers and scanners support at least a wireless access and optionally a wired access. As more IoT enabled office equipment is developed and deployed, the potential benefits of a 5G PVN are readily accessible. 3GPP 5G enhancements such as support for exclusive networks and network slicing enable scalable use by a range of customers, from home offices to large multi-building office campus' and everything in between. A large business may deploy a exclusive network. A smaller business may opt for a dedicated network slice. A home office may use a 5G PVN home network. Other enhancements such as increased support for use of both licensed and unlicensed spectrum provide an attractive environment both large scale and localized radio connectivity. Furthermore, 3GPP's 5G technology offers many security enhancements beyond what is currently available from other wireless technologies.
5.1.2  Scenario
5.1.3  Potential service requirements
5.1.4  Potential operational requirementsWord-p. 12
5.2  Use case for bring your own device
5.2.1  Description
Many enterprises are turning to a "bring your own device" (BYOD) operation mode to provide access to enterprise networks for an increasingly mobile workforce. As the employees incorporate IoT into their tool set (e.g., smart watches, tablets), a number of challenges arise as different employees may subscribe to different service providers, indeed an individual may have multiple devices with subscriptions to different service providers. The enterprise needs a flexible solution to provide intranet access to all the devices used by its employees. This solution must provide the same accessibility and security as if all devices were under a single corporate subscription.
An enterprise 5G PVN can provide this service. By hosting a multi-operator 5G PVN, the enterprise can provide mobile broadband services to all devices (e.g., smartphone, tablet, smartwatch) used in the work place, while also providing a secure intranet for access to all enterprise systems (e.g., printers, databases, software tools). Additionally, this support can be provided by the 5G PVN without the need for multiple operators to provide concurrent coverage while minimizing interference.
5.2.2  Scenario
5.2.3  Potential service requirementsUp
5.2.4  Potential operational requirementsWord-p. 13
5.3  Use case on private communication with UEs of different MNOs
5.3.1  Overall Description
This use cases describes the case that a restricted set of UEs to communicate privately amongst each other even if these UEs are subscribers to different MNOs.
5.3.2  Preconditions
5.3.3  Service flows
5.3.4  Post-conditions
5.3.5  Potential Impacts or Interactions with Existing Services/Features
5.3.6  Potential Requirements
5.4  Private data communication service in a residential setting
5.4.1  DescriptionUp
MNO-X is providing fixed-mobile converged Internet access through a 5G network. Depending on the situation, different network architectures may be used to provide Internet access.
Examples are:
  • Fibre-To-The-Home (FTTH) where the residential gateway is seen as a UE. Indirect communication with the residential gateway as relay may be used to connect other UEs in the house.
  • Fibre-To-The-Home (FTTH) where one or more 5G small cells (femto cells) are connected to the residential gateway.
  • Outdoor to indoor coverage from small cells e.g. at streetlights. Indirect communication via relay UEs may be used to improve coverage in the house.
Which connection scenario works best depends on local conditions (e.g. type of houses, available cable networks, et cetera). As the residential home owners have little or no choice in what scenario MNO-X deploys for their residential area, MNO-X wants to harmonise its service offering over all the scenarios. The user experience should not depend on the connectivity scenario.
5.4.2  Pre-conditionsWord-p. 14
5.4.3  Service Flows
5.4.4  Post-conditions
5.4.5  Potential Impacts or Interactions with Existing Services/Features
5.4.6  Potential Requirements
5.5  Private data communication service in an office settingWord-p. 15
5.5.1  Description
OfficeSpace is a company that provides office space for rent. OfficeSpace owns the building, and rents out fully furnished and equipped office space to SMEs. Next to providing toilets, reception services, coffee and lunch facilities, office rental companies also have to ensure that their customers can use IT facilities and have excellent (mobile) Internet access.
OfficeSpace has decided to fully rely on mobile communication for the internal Internet access and IT services (printers, beamers, et cetera). All devices are connected via PLMN communication. All servers et cetera are in the cloud. This saves greatly on the amount of cabling needed in the office. Furthermore, it provides the flexibility needed with the ever changing tenants.
OfficeSpace's customers may use any of the mobile networks. And with the addition of visitors it is clear that OfficeSpace needs to ensure there is coverage for all mobile users, regardless of subscription. Because of the high frequencies needed to provide sufficient capacity for an in office mobile network, indoor small cell base stations are used to cover the office floors and various meeting rooms. Because installing a separate indoor infrastructure for each of the mobile operators would be too costly, OfficeSpace together with the mobile operators has implemented a shared radio access network. Implementing a shared radio access network implies that there is only one set of indoor base stations (plus the required connectivity of these base stations) for all operators.
5.5.2  Pre-conditions
5.5.3  Service Flows
5.5.4  Post-conditionsUp
5.5.5  Potential Impacts or Interactions with Existing Services/Features
5.5.6  Potential Requirements
5.6  Private data communication service in a large scale industrial settingWord-p. 16
5.6.1  Description
Oil&Gas is a company that owns the rights to exploit oil and gas field. The size of a typical field where they are pumping up oil or natural gas would be several thousands of square kilometres. Throughout this area Oil&Gas would deploy an infrastructure of pumps, pipelines, valves, compressors, et cetera. Often this equipment is deployed in rural/remote areas, where there is limited availability of electricity and cable infrastructure.
Oil&Gas has equipped their entire infrastructure with sensors and actuators which are connected via a mobile network. Using a mobile network allows Oil&Gas to more flexibly deploy its infrastructure.
The different sensors and actuators communicate using typical industrial data communication protocols as if they are connected to the same Local Area Network. The difference is that the "Local" Area Network, now spans a very large area. When including oil and gas transport pipelines, the network may even span multiple countries; a pressure sensor in one country communicates with a valve in another country on the other side of the pipeline.
5.6.2  Pre-conditions
5.6.3  Service Flows
5.6.4  Post-conditions
5.6.5  Potential Impacts or Interactions with Existing Services/Features
5.6.6  Potential Requirements
5.7  Private P2P data communication using on-demand connectionsUp
5.7.1  Description
Joe is a service engineer for farming equipment. He services various kinds of equipment for his customers the farmers. As technology evolves, farming equipment is increasingly becoming smart. This implies that servicing equipment generally implies hooking up his computer to the equipment to see what may be wrong. A great benefit of mobile communication is that he can now also remotely connect to the equipment, regardless of where he or the farm equipment is located.
5.7.2  Pre-conditionsWord-p. 17
5.7.3  Service Flows
5.7.4  Post-conditionsWord-p. 18
5.7.5  Potential Impacts or Interactions with Existing Services/Features
5.7.6  Potential Requirements
5.8  Residential 5G PVN
5.8.1  Description
In this use case a residential 5G PVN is initially formed with two devices. The two devices are physically located in the home and they connect to the 3GPP network via two separate UEs (UE1 and UE2). The home owner wants to add sensors to the residential 5G PVN in order to be able to securely control the sensors using the home computer which is already connected to the 5G PVN.
5.8.2  Pre-conditions
5.8.3  Service FlowsWord-p. 19
5.8.4  Post-conditions
5.8.5  Potential requirementsWord-p. 20
5.9  Use case on Addition of UE in a 3GPP private group communications
5.9.1  Description
This use case describes the addition of new equipment into an existing 3GPP private group communications with automatic private group update, i.e. as soon as equipment is added in the company.
5.9.2  Preconditions
5.9.3  Service flows
5.9.4  Post-conditionsWord-p. 21
5.9.5  Potential Impacts or Interactions with Existing Services/Features
5.9.6  Potential Requirements
5.10  Use case for Removal of UE from a private group communicationUp
5.11  Use case for UE part of multiple private communications
5.11.1  Description
In the enterprise, some equipment may be common for usage by different departments, e.g., a server and a printer can be common to multiple departments.
Bob needs multiple independent communications between UEs of different departments but also want some common equipment to be used by equipments of different departments.
5.11.2  Preconditions
5.11.3  Service flowsUp
5.11.4  Post-conditions
5.11.5  Potential Impacts or Interactions with Existing Services/FeaturesWord-p. 23
5.11.6  Potential Requirements
5.12  Use Case for enabling Ethernet-based private communication in 3GPP
5.12.1  Description
The sensors and actuators are using Non-IP transport services (e.g., Ethernet) to transport control signalling in legacy LANs of industry factories.
This use case is about the 3GPP system to consider Ethernet-based protocol for private communications between UEs.
5.12.2  Preconditions
5.12.3  Service flows
5.12.4  Post-conditions
5.12.5  Potential Impacts or Interactions with Existing Services/Features
5.12.6  Potential RequirementsUp
5.13  Use Case for Service Continuity in private group communicationWord-p. 24
5.14  Private data communication service using semi-permanent connections
5.14.1  Description
Farmer X has a large area of land where he grows potatoes. As an innovative farmer, Farmer X has deployed various sensors to continuously measure the condition of his crop. For example, sensors measure the moisture level of the soil and provide this information to an irrigation system. Automatically, movable sprinklers are deployed to provide water in the right areas. Also this sprinkler system uses various sensors (e.g. water pressure) and actuators (e.g. valves). All these sensors and actuators are connected via a 3GPP private data communication service.
5.14.2  Pre-conditionsWord-p. 25
5.14.3  Service Flows
5.14.4  Post-conditions
5.14.5  Potential Impacts or Interactions with Existing Services/Features
5.14.6  Potential RequirementsWord-p. 26
5.15  Use case for multiple private communications in the same network
5.15.1  Description
In the enterprise, there are several departments, and the head, Bob, needs multiple independent groups of UEs communicating together for each department.
5.15.2  PreconditionsWord-p. 27
5.15.3  Service flows
5.15.4  Post-conditions
5.15.5  Potential Impacts or Interactions with Existing Services/FeaturesUp
5.15.6  Potential Requirements
5.16  Use case on service management
5.16.0  Overall Description
5.16.1  Description
3GPP MNO enables private communications, i.e., enable a restricted set of UEs to communicate amongst each other via 3GPP network in order to support enterprise, residential homes and industry equipment communications.
5.16.2  PreconditionsWord-p. 28
5.16.3  Service flows
5.16.4  Post-conditions
5.16.5  Potential Impacts or Interactions with Existing Services/Features
5.16.6  Potential Requirements
5.17  Factory AutomationUp
5.17.1  Description
In this use case a factory producing electronic goods using highly precise automated robots co-ordinated by tight closed-loop control has used 5G replace some of the wired Ethernet connections. There are several drivers to replace wired links with wireless links. For example, devices are mobile, cables need to go through hazardous areas, or moving parts in a machine need connectivity. Further, providing wireless connectivity can enable rapid reconfiguration of a factory, which can yield improvements in productivity.
5.17.2  Preconditions
5.17.3  Service flows
5.17.4  Post-conditions
5.17.5  Potential Impacts or Interactions with Existing Services/Features
5.18  Use case on Industry Communication with stable latency needsWord-p. 31
5.18.1  Description
Factory manager, Bob, has deployed a traditional factory network for connecting sensors, actuators and controllers.
A motion controller periodically sends desired set points to one or several actuators which thereupon perform a corresponding action on one or several processes. This is done in a strictly cyclic and deterministic manner. In order to avoid a later transmission arrives before an older one, the actual latency for each packet delivery should be stable, i.e., not too early nor too late. In factory network, Industrial Ethernet technologies can be used, such as 802.1Qbv based Ethernet Switch, which guarantee latency for each Ethernet packet delivery is stable inside the Enterprise network.
Now as an innovative farmer, Bob deploys new type of actuators with 5G capability and 5G subscription to measure the condition of the product. These actuators are connected to 3GPP network and communicate with the factory network.
5.18.2  Preconditions
5.18.3  Service flows
5.18.4  Post-conditionsWord-p. 32
5.18.5  Potential Impacts or Interactions with Existing Services/Features
5.18.6  Potential Requirements
5.19  Use case for accessing 5GLAN via Relay UE
5.19.1  Description
Remote UE access to 5G LAN-style service is not considered in 5GLAN TR currently while it should be possible to allow a devices to use 5G LAN-style services and be under MNO control even when such device connects to 3GPP network via a relay UE (the relay UE could be either part of 5GLAN or not).
5.19.2  PreconditionsUp
5.19.3  Service flows
5.19.4  Post-conditions
5.19.5  Potential Impacts or Interactions with Existing Services/Features
5.19.6  Potential Requirements
5.20  Use case for 5G PVN with private addressingWord-p. 33
5.20.1  Description
Use of 3GPP technology for a 5G PVN allows expansion from only 5G LAN-type services to also encompass services previously considered similar to what a PBX might provide. This is a significant advantage for a multi-site enterprise. For example, in a multi-site enterprise, all sites could be connected to a common 5G PVN for 5G LAN-type services and also use the 5G PVN to communicate among employees across sites using a private addressing scheme that simplifies addressing within the enterprise. The common 5G LAN-type services allow employees to enjoy the same access to all of their files, applications, equipment, and colleagues regardless of which site they might be at physically. The private addressing scheme allows employees on the 5G PVN to contact each other directly using the simplified corporate addresses.
Use of a private addressing scheme within a 5G PVN does not preclude a UE from communicating outside of the 5G PVN using its public address.
5.20.2  Scenario
5.20.3  Potential service requirements
5.21  High Performance Manufacturing
5.21.1  DescriptionUp
Multiple use cases in manufacturing apply sequence-control mechanisms with highly deterministic and periodic (or cyclic) message exchanges that have stringent requirements on latency, reliability and isochronism. The following use cases discussed in Communications for Automation in Vertical Domains (TR 22.803) fall into this category:
  • Motion control,
  • Control-to-control communications,
  • Mobile robots,
  • Massive wireless sensor networks.
These use cases rely on industrial Ethernet for communications among the various nodes such as sensors, actuators, controllers, bridges and gateways. The Ethernet network might support different, use-case- or deployment-specific topologies such as ring, star, tree or mesh. From the Ethernet perspective, the various communications nodes group into end stations and bridges.
5.21.2  PreconditionsWord-p. 35
5.21.3  Service flows
5.21.4  Post-conditionsWord-p. 36
5.21.5  Potential Impacts or Interactions with Existing Services/Features
5.21.6  Potential Requirements
5.22  Device Management and OnboardingWord-p. 37
5.22.1  Description
Grace is responsible for installing networked devices in a new production cell at a factory. She needs to unpack, configure, install, and test devices, and work with her colleagues to get the production process running smoothly.
5.22.2  Preconditions
5.22.3  Service flows
5.22.4  Post-conditionsUp
5.22.5  Potential Impacts or Interactions with Existing Services/Features
5.22.6  Potential Requirements
5.23  User identification and reachability
5.23.1  Description
This use case describes a scenario where the 3GPP system sets up a 5GLAN connection between a requesting UE and a reachable requested UE without exposing personal identifying information to either. The requesting device is notified if the requested device is not reachable.
5.23.2  Pre-conditions
5.23.3  Service FlowsWord-p. 38
5.23.4  Post-conditions
5.23.5  Potential impacts or interactions
5.23.6  Potential requirements
5.24  Use case for 5G PVN virtual officeUp
5.24.1  Description
An advantage a 5G PVN has over existing LANs is the ability to interwork with the larger public network and provide access beyond a limited geographic boundary. This is a significant advantage for an enterprise with a wide spread customer base or with employees who work remotely. It is also well suited to today's sharing economy in which the work is done by contractors working in their own time and space rather than for fixed periods in an office. In all of these cases, the workers need to have access to the enterprise 5G PVN from where ever they are working, be it at home, on the road, or on a customer premises.
Since the 5G PVN uses 3GPP technology, it can be used to provide a virtual office environment with 5G LAN-type services for all workers, regardless of location. Using a smartphone or tablet, workers can access the company databases, office equipment, and their colleagues using the 5G LAN-type service from their own home or customer premises at any time of the day or night.
An additional benefit of using 3GPP technology is that workers can use their same smart phone to access both other devices on the 5G PVN and other UEs that are not on the 5G PVN such as customers or suppliers. This minimizes the equipment needed by the workers as one smartphone can serve all their communication needs wherever they are. At the same time, some devices such as printers may be restricted to only communicating with other devices that are members of the 5G PVN.
5.24.2  ScenarioWord-p. 39
5.24.3  Potential service requirements
5.24.4  Potential operational requirements
5.25  Use case on service exposure of 5G LAN-style service
5.25.1  Description
An enterprise manager needs a quick and efficient way to provide information regarding devices in his enterprise and the group which these devices should belong to, to the MNO. Traditional approach such as phone call and email, would take more time thus is not efficient, and also is not convenient for manager each time when adding a new device into its enterprise or creating a new private group.
5.25.2  Preconditions
5.25.3  Service flowsWord-p. 40
5.25.4  Post-conditions
5.25.5  Potential Impacts or Interactions with Existing Services/FeaturesUp
5.25.6  Potential Requirements
5.26  Use case for minimizing massive paging in 5GLAN for address discovery
5.26.1  Description
For traditional Ethernet communication, a device needs to find out the MAC address of its peer device. The device, according to the destination IP address XXX derived from the IP packet that needs to be delivered, would initiate a enquiry "who has the IP address XXX", and this enquiry is broadcasted to all the devices belonging to a same LAN. The device who has this IP address will response and provide its MAC address to the requesting device.
For 5GLAN case, it is essential to allow a UE to obtain the identifiers of other UEs in the same private communication of 5G LAN-type service for application communication use. However, the above traditional broadcast-and-response approach does not fit for mobile system, since a massive paging signalling would take place if many UEs belonging to the same 5GLAN are in IDLE mode.
5.26.2  Preconditions
5.26.3  Service flows
5.26.4  Post-conditions
5.26.5  Potential Impacts or Interactions with Existing Services/FeaturesWord-p. 41
5.26.6  Potential Requirements
5.27  Use case on discovery mechanism
5.27.1  DescriptionUp
In LAN networks, devices make use of discovery mechanism (e.g Bonjour, UPNP) to discover other devices online to be used and their characteristics. This discovery mechanism makes use of the multicast capabilities of the network. Therefore, it is important that 5G LAN support discovery mechanisms.
5.27.2  Pre-conditions
5.27.3  Service Flows
5.27.4  Post-conditions
5.27.6  Potential Requirements
5.28  Use case of scaling up/down the 5G PVN
5.28.1  Description
In this use case, the Power Grid Corporation A subscribes to Ethernet-based private data communication service from MNO X. The MNO X uses a 5G PVN to connect the Control Center and all the Smart Terminal Unit (STU) the Power Grid Corporation A has deployed.
The STUs can detect the failure events and develop failure reports which can be sent to the neighbour STUs or the Control Center. After failure detection, the STUs can perform fault isolation. The distance between the neighbour STUs can be up to several kilometres, and the whole procedure (from the failure detection to fault isolation) should be completed within for example in 180ms.
A Development Company B has new development (e.g., development of new residential area, & demolition of obsolete factory) that requires the Power Grid Corporation A to deploy/ dismantle the power system (including the STUs) in the development zone. While deploying /dismantling the power system, the Power Grid Corporation A requests for addition/removal of these STUs into/from the private data communication service. Hence, the MNO X needs to extend/reduce the 5G PVN's coverage and capacity to serve the new STUs or to exclude the old STUs.
5.28.2  PreconditionsWord-p. 42
5.28.3  Service flows
5.28.4  Post-conditions
5.28.5  Potential Impacts or Interactions with Existing Services/FeaturesUp
5.28.6  Potential RequirementsWord-p. 43
5.29  Use case for restricting UE to a 3GPP private communication group based on UE's location
5.29.1  Description
In the enterprise, some equipment may be confidential, e.g., a server stores company's confidential data.
This use case describes the restriction of UE to a specific 5G-LAN type service based on the UE's location.
5.29.2  Preconditions
5.29.3  Service flows
5.29.4  Post-conditions
5.29.5  Potential Impacts or Interactions with Existing Services/Features
5.29.6  Potential Requirements
5.30  Use case on creating and joining private multicast communicationWord-p. 44
5.30.1  DescriptionUp
This use case describes the on-demand establishment of a multicast communications within subset of UEs that are members of the 5G PVN, e.g. equipment A create a multicast on demand and B and C joins this multicast to receive A's multicast messages.
5.30.2  Preconditions
5.30.3  Service flows
5.30.4  Post-conditions
5.30.5  Potential Impacts or Interactions with Existing Services/Features
5.30.6  Potential Requirements
6  Considerations
7  Potential Requirements
8  Conclusion and RecommendationsWord-p. 49
A  Industrial Networking ModelWord-p. 50
B  Change historyWord-p. 52

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