WO2021226930A1 - Qos control method for ue to access network through relay - Google Patents
Qos control method for ue to access network through relay Download PDFInfo
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- WO2021226930A1 WO2021226930A1 PCT/CN2020/090242 CN2020090242W WO2021226930A1 WO 2021226930 A1 WO2021226930 A1 WO 2021226930A1 CN 2020090242 W CN2020090242 W CN 2020090242W WO 2021226930 A1 WO2021226930 A1 WO 2021226930A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
Definitions
- the present disclosure relates the field of communication, and particularly, to a QoS control method for user equipment (UE) to access a network through a relay.
- UE user equipment
- FIG. 1 An architecture of a 5th generation (5G) network system is illustrated in FIG. 1.
- UE performs an access layer connection with AN through Uu interface, interacts with AN about access layer messages and performs wireless data transmission.
- UE performs Non-Access-Stratum (NAS) connection with mobility management function (AMF) through N1 interface, interacts with AMF about NAS message.
- AMF is the mobility management function in the core network
- SMF is the session management function in the core network.
- AMF is also responsible for forwarding messages related to session management between UE and SMF.
- PCF is a policy management function in the core network, which is responsible for formulating the mobility management, session management, billing and other related policies for UE.
- UPF is the user interface function in the core network. UPF transmits data with external data network through N6 interface, and transmits data with AN through N3 interface.
- SMF determines the QoS rules of UE for data transmission according to the policies received from PCF and sends the rules to UE through AMF. For example, for a video transmission service, if PCF determines that the end-to-end transmission requirement for UE to use the service is 200ms, the data transmission requirement corresponding to the QoS rules received by UE is 200ms. The data transmission requirement represents the data transmission delay requirement from UE to UPF.
- FIG. 2 is an example of PC5 Unicast Links.
- UE with prose capability can also directly communicate with another UE with prose capability through PC5 interface.
- PC5 QoS rules and corresponding QoS parameters are generated directly by two UEs according to the pre-configured service requirements, to guarantee the service quality on PC5. For example, when two UEs use direct communication of prose to interact a certain video transmission service, the two UEs can determine, according to application layer service identifiers obtained from the application layer, that transmission delay requirement corresponding to PC5 QoS rules is 200 ms. The delay represents that the delay requirement of data in direct transmission between the two UEs.
- the UE When UE has both the capability of connecting to external data network through 5G network and the capability of prose, the UE can act as relay UE.
- Another remote UE with prose capability can establish a direct connection with relay UE through PC5 interface, and interact with external network through PDU established by relay UE and a 5G network, as illustrated in FIG. 3, which illustrates an architecture model using a ProSe 5G UE-to-Network Relay.
- a remote UE with prose capability establishes a direct connection with relay UE through PC5 interface, and interacts with external network through PDU session established by relay UE and a 5G network, for example, interacts about a video transmission service with end-to-end transmission delay of 200ms.
- PCF controls the transmission delay from Relay UE to an external network according to service requirement to 200ms.
- the present disclosure provided a network controlled QoS method for Layer-3 UE-to-Network Relay, comprising: when a Remote UE wants to use the service offered by an AF through 3GPP network, the Remote UE establishes a PC5 connection between Remote UE and UE to Network Relay. Remote UE interacts with AF through the PC5 connection and a PDU session of UE to Network Relay.
- FIG. 1 illustrates an architecture of 5G system.
- FIG. 2 illustrates an example of PC5 Unicast Links.
- FIG. 3 illustrates an architecture model using a ProSe 5G UE-to-Network Relay.
- Figure 4 illustrates QoS control for L3 UE-to-Network Relay.
- the UE When a normal UE want to use the service offered by an AF through 3GPP network, i.e. through Uu, the UE first setup a PDU session towards the specific DN (if the PDU session is not exist) . After that the UE interacts with AF for the application layer controlling messages required by the service, this interaction is normally carried through the default QoS flow of the PDU session. Then AF provides the service requirement to PCF, PCF generates PCC rules, based on the received service requirements from AF and the operator policies, to performs QoS control for the related SDFs.
- default PC5 QoS parameters are provided to NW Relay and Remote UE, the default PC5 QoS parameters are used to setup a default PC5 QoS Flow for a PC5 connection, but not related to a specific application.
- a Remote UE When a Remote UE want to use the service offered by an AF through 3GPP network, it selects a UE-to-Network Relay and establishes a PC5 connection between Remote UE and NW Relay, a default PC5 QoS Flow is setup using the default PC5 QoS parameters in the provisioning information.
- UE-to-Network Relay also setup a corresponding PDU session for relaying, e.g. based on the S-NSSAI, DNN requested by remote UE. After the IP address/prefix allocation, UE-to-Network Relay reports the IP info of remote UE to SMF, PCF also receives the IP info of remote UE from SMF.
- remote UE interacts with AF for the application layer controlling messages required by the service, the interaction is transferred through the default PC5 QoS Flow and the default QoS Flow of the PDU session. Then AF provides the service requirement to PCF.
- PCF has received the remote UE report from SMF, PCF knows the target UE requested by AF is a remote UE, PCF generates PCC rules (for QoS control on Uu) and the PC5 QoS parameters (for QoS control on PC5) , the PCF decision for example could base on the received service requirements from AF and the operator policies and the charging rate of Uu and PC5.
- PCF should split the PDB between remote UE and UPF into two parts: one part is the PDB between remote UE and UE-to-Network Relay, the other part is the PDB between UE-to-Network Relay and UPF.
- the 5QI and PQI will be set correspondingly.
- Figure 4 illustrates QoS control for L3 UE-to-Network Relay.
- a Remote UE When a Remote UE want to use the service offered by an AF through 3GPP network, it selects a UE-to-Network Relay and establishes a PC5 connection between Remote UE and NW Relay, it’s same as the PC5 part of step3 described in clause 6.6.2. In this step, a default PC5 QoS Flow is setup using the default PC5 QoS parameters in the provisioning information.
- UE-to-Network Relay sets up a corresponding PDU session or uses an existing PDU session for relaying, e.g. based on the S-NSSAI, DNN requested by remote UE.
- a default QoS Flow is setup for this PDU session.
- UE-to-Network Relay reports the IP info of remote UE to SMF, SMF also forwards the received report to PCF.
- Remote UE interacts with AF for the application layer controlling messages required by the service, the interaction is transferred through the default PC5 QoS Flow and the default QoS Flow of the PDU session.
- AF provides the service requirement to PCF.
- PCF knows the target UE requested by AF is a remote UE, e.g. by the IP info provided by AF and the IP info of remote UE received from SMF. PCF generates PCC rules (for QoS control on Uu) and the PC5 QoS parameters (for QoS control on PC5) , the PCF decision for example could base on the received service requirements from AF and the operator policies and the charging rate of Uu and PC5. PCF provides PCC decision to SMF.
- PCC rules for QoS control on Uu
- PC5 QoS parameters for QoS control on PC5
- SMF may decides to setup a new QoS Flow or modify an existing QoS Flow for the PDU session.
- SMF generates QoS rule to be enforced at UE-to-Network Relay and the QoS profile to be enforced at RAN for the QoS control of Uu part.
- PDU session modification procedure is performed.
- the PC5 QoS parameters is also provided to UE-to-Network Relay together with the related QoS rule.
- UE-to-Network Relay uses the PC5 QoS parameters received from CN to initiate the Layer-2 link modification procedure as described in TS 23.287 [5] .
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Abstract
There is provided a network controlled QoS method for Layer-3 UE-to-Network Relay, comprising: when a Remote UE wants to use the service offered by an AF through 3GPP network, the Remote UE establishes a PC5 connection between Remote UE and UE to Network Relay. Remote UE interacts with AF through the PC5 connection and a PDU session of UE to Network Relay.
Description
The present disclosure relates the field of communication, and particularly, to a QoS control method for user equipment (UE) to access a network through a relay.
An architecture of a 5th generation (5G) network system is illustrated in FIG. 1. In the architecture, UE performs an access layer connection with AN through Uu interface, interacts with AN about access layer messages and performs wireless data transmission. UE performs Non-Access-Stratum (NAS) connection with mobility management function (AMF) through N1 interface, interacts with AMF about NAS message. AMF is the mobility management function in the core network, SMF is the session management function in the core network. In addition to the mobility management of UE, AMF is also responsible for forwarding messages related to session management between UE and SMF. PCF is a policy management function in the core network, which is responsible for formulating the mobility management, session management, billing and other related policies for UE. UPF is the user interface function in the core network. UPF transmits data with external data network through N6 interface, and transmits data with AN through N3 interface.
After UE accesses 5G network through UU interface, PDU session is established under the control of SMF to perform data transmission. SMF determines the QoS rules of UE for data transmission according to the policies received from PCF and sends the rules to UE through AMF. For example, for a video transmission service, if PCF determines that the end-to-end transmission requirement for UE to use the service is 200ms, the data transmission requirement corresponding to the QoS rules received by UE is 200ms. The data transmission requirement represents the data transmission delay requirement from UE to UPF.
FIG. 2 is an example of PC5 Unicast Links. As illustrated in FIG. 2, UE with prose capability can also directly communicate with another UE with prose capability through PC5 interface. PC5 QoS rules and corresponding QoS parameters are generated directly by two UEs according to the pre-configured service requirements, to guarantee the service quality on PC5. For example, when two UEs use direct communication of prose to interact a certain video transmission service, the two UEs can determine, according to application layer service identifiers obtained from the application layer, that transmission delay requirement corresponding to PC5 QoS rules is 200 ms. The delay represents that the delay requirement of data in direct transmission between the two UEs.
When UE has both the capability of connecting to external data network through 5G network and the capability of prose, the UE can act as relay UE. Another remote UE with prose capability can establish a direct connection with relay UE through PC5 interface, and interact with external network through PDU established by relay UE and a 5G network, as illustrated in FIG. 3, which illustrates an architecture model using a ProSe 5G UE-to-Network Relay.
Based on the existing technology, a remote UE with prose capability establishes a direct connection with relay UE through PC5 interface, and interacts with external network through PDU session established by relay UE and a 5G network, for example, interacts about a video transmission service with end-to-end transmission delay of 200ms. PCF controls the transmission delay from Relay UE to an external network according to service requirement to 200ms. The remote UE and relay UE determine that transmission delay on a PC5 interface is also 200ms. In fact, the delay of this service is 200ms from remote UE to relay UE + 200ms from relay UE to an external network = 400ms, leading to that the service requirements of remote UE can not to be guaranteed.
SUMMARY
The present disclosure provided a network controlled QoS method for Layer-3 UE-to-Network Relay, comprising: when a Remote UE wants to use the service offered by an AF through 3GPP network, the Remote UE establishes a PC5 connection between Remote UE and UE to Network Relay. Remote UE interacts with AF through the PC5 connection and a PDU session of UE to Network Relay.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 illustrates an architecture of 5G system.
FIG. 2 illustrates an example of PC5 Unicast Links.
FIG. 3 illustrates an architecture model using a ProSe 5G UE-to-Network Relay.
Figure 4 illustrates QoS control for L3 UE-to-Network Relay.
When a normal UE want to use the service offered by an AF through 3GPP network, i.e. through Uu, the UE first setup a PDU session towards the specific DN (if the PDU session is not exist) . After that the UE interacts with AF for the application layer controlling messages required by the service, this interaction is normally carried through the default QoS flow of the PDU session. Then AF provides the service requirement to PCF, PCF generates PCC rules, based on the received service requirements from AF and the operator policies, to performs QoS control for the related SDFs.
In the current Layer-3 UE-to-Network Relay solution, how to perform QoS control separately for the PC5 and Uu connections is unclear. Because a UE may act as a normal UE or as a remote UE at different time/locations to access the same service, it’s beneficial to keep the consistency of UE and AF logic whether the UE access 3GPP network as a normal UE or as a remote UE. We propose a network controlled QoS handling for Layer-3 UE-to-Network Relay in this contribution, it’s similar to the QoS control procedure for a normal UE.
During provisioning performed for NW Relay and Remote UE, default PC5 QoS parameters are provided to NW Relay and Remote UE, the default PC5 QoS parameters are used to setup a default PC5 QoS Flow for a PC5 connection, but not related to a specific application.
When a Remote UE want to use the service offered by an AF through 3GPP network, it selects a UE-to-Network Relay and establishes a PC5 connection between Remote UE and NW Relay, a default PC5 QoS Flow is setup using the default PC5 QoS parameters in the provisioning information.
UE-to-Network Relay also setup a corresponding PDU session for relaying, e.g. based on the S-NSSAI, DNN requested by remote UE. After the IP address/prefix allocation, UE-to-Network Relay reports the IP info of remote UE to SMF, PCF also receives the IP info of remote UE from SMF.
After the PC5 connection and the related PDU session setup, remote UE interacts with AF for the application layer controlling messages required by the service, the interaction is transferred through the default PC5 QoS Flow and the default QoS Flow of the PDU session. Then AF provides the service requirement to PCF. As PCF has received the remote UE report from SMF, PCF knows the target UE requested by AF is a remote UE, PCF generates PCC rules (for QoS control on Uu) and the PC5 QoS parameters (for QoS control on PC5) , the PCF decision for example could base on the received service requirements from AF and the operator policies and the charging rate of Uu and PC5. The PCF decision for QoS splitting between Uu and PC5 interface is mainly for PDB, i.e. PCF should split the PDB between remote UE and UPF into two parts: one part is the PDB between remote UE and UE-to-Network Relay, the other part is the PDB between UE-to-Network Relay and UPF. The 5QI and PQI will be set correspondingly.
Figure 4 illustrates QoS control for L3 UE-to-Network Relay.
1. When a Remote UE want to use the service offered by an AF through 3GPP network, it selects a UE-to-Network Relay and establishes a PC5 connection between Remote UE and NW Relay, it’s same as the PC5 part of step3 described in clause 6.6.2. In this step, a default PC5 QoS Flow is setup using the default PC5 QoS parameters in the provisioning information.
2. UE-to-Network Relay sets up a corresponding PDU session or uses an existing PDU session for relaying, e.g. based on the S-NSSAI, DNN requested by remote UE. A default QoS Flow is setup for this PDU session.
3. After the IP address/prefix allocation, UE-to-Network Relay reports the IP info of remote UE to SMF, SMF also forwards the received report to PCF.
4. Remote UE interacts with AF for the application layer controlling messages required by the service, the interaction is transferred through the default PC5 QoS Flow and the default QoS Flow of the PDU session.
5. AF provides the service requirement to PCF.
6. PCF knows the target UE requested by AF is a remote UE, e.g. by the IP info provided by AF and the IP info of remote UE received from SMF. PCF generates PCC rules (for QoS control on Uu) and the PC5 QoS parameters (for QoS control on PC5) , the PCF decision for example could base on the received service requirements from AF and the operator policies and the charging rate of Uu and PC5. PCF provides PCC decision to SMF.
7. Based on the PCC rules received from PCF, SMF may decides to setup a new QoS Flow or modify an existing QoS Flow for the PDU session. SMF generates QoS rule to be enforced at UE-to-Network Relay and the QoS profile to be enforced at RAN for the QoS control of Uu part. PDU session modification procedure is performed. The PC5 QoS parameters is also provided to UE-to-Network Relay together with the related QoS rule.
8. UE-to-Network Relay uses the PC5 QoS parameters received from CN to initiate the Layer-2 link modification procedure as described in TS 23.287 [5] .
Claims (3)
- A network controlled QoS method for Layer-3 UE-to-Network Relay, comprising:when a Remote UE wants to use the service offered by an AF through 3GPP network, the Remote UE establishes a PC5 connection between Remote UE and UE to Network Relay. Remote UE interacts with AF through the PC5 connection and a PDU session of UE to Network Relay.
- The method of claim 1, wherein PCF generates QoS parameters for the PDU session of UE to Network Relay and the PC5 QoS parameters for the PC5 connection.
- The method of claim 2, wherein UE to Network Relay modify the PC5 connection based on the PC5 QoS parameters decided by PCF.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2020/090242 WO2021226930A1 (en) | 2020-05-14 | 2020-05-14 | Qos control method for ue to access network through relay |
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| PCT/CN2020/090242 WO2021226930A1 (en) | 2020-05-14 | 2020-05-14 | Qos control method for ue to access network through relay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2596218B (en) * | 2020-05-19 | 2023-03-01 | Samsung Electronics Co Ltd | Improvements in and relating to QoS Handling |
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