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EP-4255090-B1 - DATA TRANSMISSION METHOD AND RELATED METHODS, COMMUNICATION DEVICE AND SYSTEM WITH NETWORK DEVICE

EP4255090B1EP 4255090 B1EP4255090 B1EP 4255090B1EP-4255090-B1

Inventors

  • GUO, YALI

Dates

Publication Date
20260506
Application Date
20210128

Claims (7)

  1. A method for data transmission, comprising: establishing, by a first terminal device, a short-range communication connection with a second terminal device, wherein the short-range communication connection is a PC5 connection; receiving (S310), by the first terminal device, first information and relay-data type information corresponding to the first information from a network device, the relay-data type information being indicative of a type of relay data, wherein the type of relay data comprises an internet protocol, IP, type, an Ethernet type, or an unstructured type, the first information comprises a relay service code, RSC; sending (S320), by the first terminal device, relay data of the type to the second terminal device via the short-range communication connection, wherein the network device is a policy control function, PCF, the first terminal device is a remote UE, and the second terminal device is a relay UE; wherein the method further comprises: establishing, by the first terminal device, the short-range communication connection with the second terminal device, wherein the short-range communication connection corresponds to the first information; wherein the short-range communication connection is a PC5 connection; wherein establishing, by the first terminal device, the short-range communication connection with the second terminal device comprises: receiving, by the first terminal device, multiple RSCs broadcasted and supported by the second terminal device ; selecting, by the first terminal device, one RSC from the multiple RSCs supported by the second terminal device; sending, by the first terminal device, a short-range connection establishment request to the second terminal device to request to establish the PC5 connection corresponding to the RSC, wherein the PC5 connection, corresponding to the RSC, between the second terminal device and the first terminal device is established when the second terminal device replies a short-range connection establishment response to the first terminal device.
  2. A method for session establishment, comprising: establishing, by a second terminal device, a short-range communication connection with a first terminal device, wherein the short-range communication connection is a PC5 connection, wherein the short-range communication connection is provided for the second terminal device to receive relay data of a type indicated by relay-data type information corresponding to first information, from the first terminal device; receiving (S610), by the second terminal device, first information and first-session type information corresponding to the first information from a network device, the first-session type information being indicative of a type of a first session, wherein the type of the first session comprises an internet protocol, IP, type, an Ethernet type, or an unstructured type, wherein the first information comprises a relay service code, RSC; and establishing (S620), by the second terminal device, the first session of the type with a core network; wherein the network device is a policy control function, PCF, the first terminal device is a remote UE, and the second terminal device is a relay UE; wherein the method further comprises: establishing, by the second terminal device, the short-range communication connection with the first terminal device, wherein the short-range communication connection corresponds to the first information; wherein the short-range communication connection is a PC5 connection; wherein establishing, by the second terminal device, the short-range communication connection with the first terminal device comprises: broadcasting, by the second terminal device, multiple RSCs supported by the second terminal device; receiving, by the second terminal device, a short-range connection establishment request from the first terminal device after the first terminal device selects one RSC from the multiple RSCs supported by the second terminal device; replying, by the second terminal device, a short-range connection establishment response to the first terminal device, thus to establish the PC5 connection, corresponding to the RSC, between the second terminal device and the first terminal device.
  3. The method of claim 2, wherein establishing, by the second terminal device, the first session of the type with the core network comprises: establishing, by the second terminal device, the first session of the type corresponding to the first information with the core network.
  4. The method of any of claims 2 to 3, further comprising: receiving, by the second terminal device, relay data from the first terminal device; and sending, by the second terminal device, the relay data over the first session of the type.
  5. A method for transmission type configuration, comprising: sending (S710), by a network device, first information and relay-data type information corresponding to the first information to a first terminal device, and sending, by the network device, the first information and first-session type information corresponding to the first information to a second terminal device, wherein the relay-data type information is indicative of a type of relay data, and the first-session type information is indicative of a type of a first session, wherein the type of relay data comprises an internet protocol, IP, type, an Ethernet type, or an unstructured type, the first information comprises a relay service code, RSC, wherein the type of the first session comprises the IP type, the Ethernet type, or the unstructured type, wherein the first information comprises a relay service code, RSC, wherein the network device is a policy control function, PCF, the first terminal device is a remote UE, and the second terminal device is a relay UE, and wherein relay data of the type is transmitted over the first session of the type; wherein the first terminal device is connected with the second terminal via a short-range communication connection, wherein the short-range communication connection is a PC5 connection, and the short-range communication connection is provided for the first terminal device to send relay data of the type indicated by the relay-data type information corresponding to the first information, to the second terminal device; wherein the short-range communication connection between the first terminal device and the second terminal device is established by: receiving, by the first terminal device, multiple RSCs broadcasted and supported by the second terminal device ; selecting, by the first terminal device, one RSC from the multiple RSCs supported by the second terminal device; and sending, by the first terminal device, a short-range connection establishment request to the second terminal device to request to establish the PC5 connection corresponding to the RSC, wherein the PC5 connection, corresponding to the RSC, between the second terminal device and the first terminal device is established when the second terminal device replies a short-range connection establishment response to the first terminal device.
  6. The method of claim 5, wherein sending, by the network device, the first information and the first-session type information corresponding to the first information to the second terminal device comprises one of: sending, by the network device, a short-range communication configuration to the second terminal device, wherein the short-range communication configuration comprises the first information and the first-session type information corresponding to the first information; or sending, by the network device, a user equipment, UE, route selection policy to the second terminal device, wherein the UE route selection policy comprises the first information and the first-session type information corresponding to the first information.
  7. A communication device or a system comprising a first communication device and a second communication device, the communication device or each of the first communication device and the second communication device comprising: a transceiver (1130); a memory (1120) configured to store computer programs; and a processor (1110) configured to invoke and execute the computer programs stored in the memory and control the transceiver to perform a method; wherein the communication device is operable as a first terminal device and the method is the method of claim 1; or wherein the communication device is operable as a second terminal device and the method is the method of claims 2 to 4; or wherein the first communication device of the system is operable as a network device, the second communication device of the system is operable as a first terminal device and the method is the method of claims 5 to 6.

Description

TECHNICAL FIELD This disclosure relates to the field of communication, and more particularly to a method for data transmission, a method for session establishment, a method for transmission type configuration and corresponding communication devices. BACKGROUND A user equipment (UE) having proximity-based service (ProSe) capability can communicate directly with another UE having ProSe capability over a short-range communication connection interface. If a UE can be connected to an external data network over a communication network and also has ProSe capability, the UE can act as a relay UE, and another remote UE having ProSe capability can establish a direct connection with the relay UE over a short-range communication interface and communicate with an external network over a session established between the relay UE and the communication network. In the related art, a session established between the relay UE and the core network has various types, where different types of sessions can be used for transmitting data of corresponding types, and relay data transmitted between the remote UE and the relay UE may also have various types, and as a result, the type of the session between the relay UE and the core network may be incompatible with the type of relay data sent by the remote UE. For example, if the relay data transmitted between the remote UE and the relay UE cannot be transmitted over the type of the session established between the relay UE and the core network, the relay UE will be unable to transfer correctly data received from the remote UE, thus resulting in failure in data transmission. Document "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Study on system enhancement for Proximity based Services (ProSe) in the 5G System (5GS) (Release 17)", 3GPP DRAFT; SP-200962.ZIP 23752-100, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, 30 November 2020, Retrieved from the Internet:URL:https://ftp.3gpp.org/tsg_saJ TSG_SA/TSGs_90E_Electronic/Docs/SP-200962.zip 23752-100.zip 23752-100.docx, discloses that the objective of this Technical Report is to identify and evaluate architecture enhancements of 5G System design needed to support proximity based services based on SA WG1 requirements defined in TS 22.278 [2], TS 22.261 [3] and TS 22.115 [4] and determine which of the solutions can proceed to normative specifications. Document VIVO: "KI#3, Sol#35: Updates with EN resolving", 3GPP DRAFT; S2-2008591, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. SA WG2, no. Electronic; 20201116 - 20201120 9 November 2020, Retrieved from the Internet: URL:https://ftp.3gpp.org/tsg_sa/WG2_Arch/TSGS2_142e_Electronic/ Docs/S2-2008591.zip S2-2008591_KI#3, Sol#35, Updates with EN resolving.doc, discloses that Considering that there is no CP between remote UE and its CN for the L3 relay not using the N3IWF,remote UE cannot obtain the policy by reusing the PCF-based service authorization and provisioning directly, it seems the relay UEand relay UE's network should be taken as the proxy to route the remote UE's policy from remote PCF to the remote UE.If adopting this idea to resolve above 2ENs, there will be a lot of enhancements to be done on the UE, NFs andinteraction between networks. To save energy and time, the basic idea of resolving the 2 above ENs is taking the pre-configured policy and parameter as the principle all the time is the remote UE is out of coverage. Document INTEL: "KI#8, Solution #35 Clarification", 3GPP DRAFT; S2-2009460, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE,vol. SA WG2, no. Elbonia; 20201116 - 20201120 23 November 2020, Retrieved from the Internet:URL:https:/ftp.3gpp.org/tsg_sa/WG2_Arch/TSGS2_142e_Electronic/INBOX/ S2-2009460.zip S2-2009460 (was 8374r04)_ProSe_Sol_#35_clarification_v1.docx, discloses that for PCF based Service Authorization and Provisioning to 5G ProSe Remote UENE-to-Network Relay, the Registration procedures as defined in clause 4.2.2.2 of TS 23.502 [S], UE Policy Association Establishment procedure as defined in clause 4.16.1 1 of TS 23.502 [S] and UE Policy Association Modification procedure as defined in clause 4.16.12 of TS 23.502 [S] apply with the following additions...... Document FRAUNHOFER HHI: "KI#3, #8, Resolve EN in Sol #35: Authorization for 5G ProSe UE-to- Network Relay Service", 3GPP DRAFT; S2-2006929, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, vol. SA WG2, no. e-meeting; 20201012 - 20201023 2 October 2020, Retrieved from the Internet:URL:https://ftp.3gpp.org/tsg_sa/WG2_Arch/ TSGS2_141e_Electronic/Docs/S2-2006929.zip S2-2006929 KI#3 #8 Sol #35 resolving EN.doc, also disclose