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EP-4420373-B1 - CONTROL PLANE-BASED COMMUNICATION OF MULTIMEDIA BROADCAST/MULTICAST SERVICE SERVICE KEYS

EP4420373B1EP 4420373 B1EP4420373 B1EP 4420373B1EP-4420373-B1

Inventors

  • LEE, SOO BUM
  • ESCOTT, ADRIAN EDWARD
  • PALANIGOUNDER, ANAND
  • KIM, HONGIL

Dates

Publication Date
20260513
Application Date
20220831

Claims (15)

  1. A user equipment, UE, (1000) for wireless communication, comprising: a memory (1030); and one or more processors (1020), coupled to the memory (1030), configured to: register (710) to a cellular network associated with a multimedia broadcast/multicast service, MBMS; transmit (720), to the cellular network, a request to join the MBMS; and receive (730), via a control plane of the cellular network and based at least in part on being registered with the cellular network, a response that includes an MBMS service key, MSK, and MSK identifier pair, wherein the MSK included in the response received via the control plane is not encrypted with an MBMS user key, MUK, or other key and relies on security already established on the control plane.
  2. The UE (1000) of claim 1, wherein the response comprises one or more of: an indication of a validity of the MSK, an MBMS traffic key associated with the MSK, an MBMS traffic key identifier associated with the MBMS traffic key, or an indication of a validity of the MBMS traffic key, and optionally wherein the one or more processors (1020) are further configured to: transmit, to the cellular network, a request for an updated MBMS traffic key based at least in part on receiving an indication of an update to the MBMS traffic key; and receive the updated MBMS traffic key via the control plane of the cellular network.
  3. The UE (1000) of claim 1, wherein: the one or more processors (1020) are further configured to receive, after receiving (730) the response via the control plane of the cellular network, an updated response via the point-to-multipoint communication; or the one or more processors (1020) are configured to receive (730) the response via the control plane of the cellular network and via one or more of: a multicast/broadcast session management function, a session management function, or an access and mobility management function.
  4. The UE (1000) of claim 1, wherein the one or more processors (1020) are configured to: receive (730) the response via a control plane signaling message, optionally wherein the control plane signaling message comprises a downlink non-access stratum, NAS, message.
  5. A network entity (1000) for wireless communication, comprising: a memory (1030); and one or more processors (1020), coupled to the memory (1030), configured to: receive (810), from a user equipment, UE, and via a cellular network, a request to join a multimedia broadcast/multicast service, MBMS ; and transmit (820), to the UE via a control plane of the cellular network based at least in part on the UE being registered with the cellular network, a response including an MBMS service key, MSK, wherein the MSK included in the response transmitted via the control plane is not encrypted with an MBMS user key, MUK, or other key and relies on security already established on the control plane.
  6. The network entity (1000) of claim 5, wherein the one or more processors (1020) are further configured to generate the MSK before transmitting the MSK, optionally wherein the one or more processors (1020), to generate the MSK before transmitting (820) the MSK, are configured to generate the MSK based at least in part on one or more of: a change of multicast/broadcast membership, a periodicity for updating the MSK, detecting a security event associated with the MSK.
  7. The network entity (1000) of claim 5, wherein: the network entity comprises a multicast/broadcast service function, MBSF; or the one or more processors (1020) are further configured to receive, from an additional network entity, an MBMS traffic key that is associated with the MSK.
  8. The network entity (1000) of claim 5, wherein the one or more processors (1020) are further configured to transmit an MBMS traffic key to an additional network entity, optionally wherein: the one or more processors (1020), to transmit the MBMS traffic key to the additional network entity, are configured to transmit the MBMS traffic key to the additional network entity based at least in part on one or more of: receiving, from the additional network entity, a request for the MBMS traffic key, or a periodicity for updating the MBMS traffic key; or the one or more processors (1020) are further configured to generate the MBMS traffic key before transmitting the MBMS traffic key; or the additional network entity comprises one or more of a broadcast/multicast service center, BM-SC, a multicast/broadcast service traffic function, MBSTF, or a key distribution entity.
  9. The network entity (1000) of claim 5, wherein the one or more processors (1020) are further configured to receive, from an additional network entity, an updated MBMS traffic key; transmit, to the UE, the updated MBMS traffic key via the control plane of the cellular network; or a combination thereof, and optionally wherein: the one or more processors (1020) are further configured to transmit, to an additional network entity, the updated MBMS traffic key; or the one or more processors (1020), to transmit the updated MBMS traffic key via the control plane of the cellular network, are configured to: transmit the updated MBMS traffic key based at least in part on reception of a request from the UE, or transmit the updated MBMS traffic key to the UE based at least in part on the UE joining the MBMS.
  10. The network entity (1000) of claim 5, wherein the one or more processors (1020) are further configured to receive, from an additional network entity, an indication to update the MSK; and transmit, to the additional network entity, an updated MSK, and optionally wherein the one or more processors (1020) are further configured to transmit, to the UE, the updated MSK.
  11. The network entity (1000) of claim 5, wherein the one or more processors (1020), to transmit (820) the MSK to the UE via the control plane of the cellular network, are configured to transmit (820) the MSK via one or more of: a multicast/broadcast session management function, a session management function, or an access and mobility management function.
  12. A method (700) of wireless communication performed by a user equipment, UE (1000), comprising: registering (710) to a cellular network associated with a multimedia broadcast/multicast service, MBMS; transmitting (720), to the cellular network, a request to join the MBMS; and receiving (730), via a control plane of the cellular network and based at least in part on being registered with the cellular network, a response that indicates an MBMS service key, MSK, and MSK identifier pair, wherein the MSK included in the response received via the control plane is not encrypted with an MBMS user key, MUK, or other key and relies on security already established on the control plane.
  13. A method (800) of wireless communication performed by a network entity (1000), comprising: receiving (810), from a user equipment, UE, and via a cellular network, a request to join a multimedia broadcast/multicast service, MBMS; and transmitting (820), to the UE via a control plane of the cellular network based at least in part on the UE being registered with the cellular network, a response including an MBMS service key, MSK, wherein the MSK included in the response transmitted via the control plane is not encrypted with an MBMS user key, MUK, or other key and relies on security already established on the control plane.
  14. A non-transitory computer-readable medium that stores a set of instructions for wireless communication by a user equipment, UE (1000), which, when executed by one or more processors (1020) of the UE (1000), cause the UE (1000) to: register (710) to a cellular network associated with a multimedia broadcast/multicast service, MBMS; transmit (720), to the cellular network, a request to join the MBMS; and receive (730), via a control plane of the cellular network and based at least in part on being registered with the cellular network, a response that includes an MBMS service key, MSK, and MSK identifier pair, wherein the MSK included in the response received via the control plane is not encrypted with an MBMS user key, MUK, or other key and relies on security already established on the control plane.
  15. A non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network entity (1000) which, when executed by one or more processors (1020) of the network entity (1000), cause the network entity (1000) to: receive (810), from a user equipment, UE and via a cellular network, a request to join a multimedia broadcast/multicast service, MBMS; and transmit (820), to the UE via a control plane of the cellular network based at least in part on the UE being registered with the cellular network, a response including an MBMS service key, MSK, wherein the MSK included in the response transmitted via the control plane is not encrypted with an MBMS user key, MUK, or other key and relies on security already established on the control plane.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for control plane-based communication of multimedia broadcast/multicast service service keys. BACKGROUND Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP). A wireless network may include one or more base stations that support communication for a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink communications and uplink communications. "Downlink" (or "DL") refers to a communication link from the base station to the UE, and "uplink" (or "UL") refers to a communication link from the UE to the base station. The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, and/or global level. New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and/or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful. The Paper "Update the solution #12" by ZTE for 3GPP TSG-SA3 Meeting #104-e, S3-212555, XP052063212, proposes to leverage the MBMS security architecture specified in TS 33.246 to protect the 5G Multicast-Broadcast Services (MBS) key and traffic at the service-layer. The Paper "Update Solution 11 for reduced key update overhead" by Phillips International B.V. for 3GPP TSG-SA3 Meeting #104-e, S3-212765, XP052063416, proposes to reduce signaling overhead for key update in Solution #11 by applying the same technique described in Solution #9. The Paper "Update Solution #9" by Phillips International B.V. for 3GPP TSG-SA3 Meeting #104-e-Ad-hoc, S3-213542, XP052062995 describes an approach to optimizing a key update procedure and includes a comparison of different approaches for key update. "Security of Multimedia Broadcast/Multicast Service (MBMS)", Release 16, by 3GPP, Technical Specification Group Services and Aspects, XP051924921 is a Technical Specification relating to the security of MBMS. SUMMARY The scope of protection is defined by the scope of the appended claims. Any examples which do not fall within the scope of the claims are not presented as embodiments but as examples which are helpful for understanding the invention. While aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios. Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements. For example, some aspects may be implemented via integrated chip embodiments or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, and/or artificial intelligence devices). Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and/or system-level components. Devices incorporating described aspects and features may include additional components and features for implementation and practice of claimed and described aspects. For example, transmissio