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Content for  TS 24.257  Word version:  18.3.0

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1…   6…   6.3…   6.4…   6.7…   6.8…   6.9…   7… 
6.3 C2 Communication mode selection and switching  6.3.1 Client procedure  6.3.1.1 C2 communication modes configuration procedure  6.3.1.2 C2 communication mode selection by UAE Client procedure  6.3.1.3 UAE-layer assisted dynamic C2 mode switching procedure  6.3.2 Server procedure  6.3.2.1 C2 communication modes configuration procedure  6.3.2.2 C2 communication mode selection by UAE Client  6.3.2.3 UAE-layer assisted dynamic C2 mode switching 
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6.3  C2 Communication mode selection and switching  p. 10

6.3.1  Client procedure  p. 10

6.3.1.1  C2 communication modes configuration procedure  p. 10

Upon receiving an HTTP POST request containing:
  1. a Content-Type header field set to "application/vnd.3gpp.uae-info+xml"; and
  2. an application/vnd.3gpp.uae-info+xml MIME body with a <c2-modes-switching-configuration-info> element,
the UAE-C:
  1. shall store the received configuration information;
  2. shall generate an HTTP 200 (OK) response according to RFC 9110. In the HTTP 200 (OK) response message, the UAE-C:
    1. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml"; and
    2. shall include an application/vnd.3gpp.uae-info+xml MIME body and in the <UAE-info> root element:
      1. shall include a <c2-modes-switching-configuration-info> element with a <result> child element set to the value "positive" or "negative" indicating positive or negative result of reception and storing of the communication mode configuration parameters; and
  3. shall send the HTTP 200 (OK) response towards the UAE-S.
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6.3.1.2  C2 communication mode selection by UAE Client procedure  p. 11

UAE Clients (UAV and UAV-C) select a primary and secondary C2 communication mode based on C2 communication mode configuration, then the UAE-C shall generate an HTTP POST request according to RFC 9110. In the HTTP POST request message, the UAE-C:
  1. shall set the Request-URI to the URI received in the UAE client UE configuration document via the SCM-S;
  2. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml";
  3. shall include an application/vnd.3gpp.uae-info+xml MIME body with a <C2-communication-mode-notification-info> element in the <UAE-info> root element which:
    1. shall include a <UAS-id> element set to the identifier of the UAS;
    2. shall include a <selected-primary-C2-communication-mode> element indicating the selected primary C2 communication mode; and
    3. may include a <selected-secondary-C2-communication-mode> element indicating the selected secondary C2 communication mode; and
  4. shall send the HTTP POST request towards the UAE-S.
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6.3.1.3  UAE-layer assisted dynamic C2 mode switching procedure  p. 11

Upon detecting a condition for switching C2 communication mode based on local conditions (e.g. using the C2 communication mode switching policy) or based on a command from the UAS application specific server, the UAE-C shall generate an HTTP POST request according to RFC 9110. In the HTTP POST request message, the UAE-C:
  1. shall set the Request-URI to the URI corresponding to the identity of the UAE-S;
  2. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml";
  3. shall include an application/vnd.3gpp.uae-info+xml MIME body with a <C2-related-trigger-event-report> element in the <UAE-info> root element which shall include:
    1. a <UAE-client-id> element set to the identifier of the UAE client which indicates the QoS downgrade; and
    2. an <application-QoS-related-event> element including the expected or actual application QoS/QoE parameters which were changed (i.e. latency, throughput, reliability, jitter); and
  4. shall send the HTTP POST request towards the UAE-S.
Upon receiving an HTTP 200 (OK) message containing:
  1. a Content-Type header field set to "application/vnd.3gpp.uae-info+xml"; and
  2. an application/vnd.3gpp.uae-info+xml MIME body with a <C2-operation-mode-switching> element,
the UAE-C may start C2 communication using the indicated C2 communication mode included in the <C2-operation-mode-switching-requirement> child element and generate an HTTP POST request according to RFC 9110. In the HTTP POST request message, the UAE-C:
  1. shall set the Request-URI to the URI corresponding to the identity of the UAE-S;
  2. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml";
  3. shall include an application/vnd.3gpp.uae-info+xml MIME body with a <C2-operation-mode-switching-performed> element in the <UAE-info> root element which shall include a <result> child element set to the value "positive" or "negative" indicating positive or negative result of the reception; and
  4. shall send the HTTP POST request towards the UAE-S.
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6.3.2  Server procedure  p. 12

6.3.2.1  C2 communication modes configuration procedure  p. 12

Upon receiving an application request from UAS application specific server (which can be the USS/UTM) to manage the C2 operation modes (direct, network-assisted) of C2 communication for a UAS, the UAE-S shall generate an HTTP POST request message according to RFC 9110. In the HTTP POST request message, the UAE-S:
  1. shall include a Request-URI set to the URI corresponding to the identity of the UAE-C;
  2. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml";
  3. shall include an application/vnd.3gpp.uae-info+xml MIME body with a <c2- communication-modes-configuration-info> element in the <UAE-info> root element which:
    1. shall include a<UAS-id> element set to the identification of the UAS for which the C2 QoS management request applies; and
    2. may include a<C2-operation-mode-management-configuration> element which:
      1. shall include a<C2-operation mode-management-requirement> element set to the identification of the type of the C2 mode switching to be supported by the UAE server;
      2. shall include an<allowed-C2-communication-modes> element indicating the type of the C2 mode switching;
      3. shall include a<primary-C2-communication-mode> element indicating the primary type of the C2 mode switching;
      4. may include a<secondary-C2-communication-mode> element indicating the secondary type of the C2 mode switching; and
      5. shall include a<policy-of-C2-switching> element set to the parameters for C2 switching; and
  4. shall send the HTTP POST request message towards the UAE-C.
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6.3.2.2  C2 communication mode selection by UAE Client  p. 12

Upon receiving an HTTP POST request containing:
  1. a Content-Type header field set to "application/vnd.3gpp.uae-info+xml"; and
  2. an application/vnd.3gpp.uae-info+xml MIME body with a <C2-communication-mode-notification-info> element,
the UAE-S shall store the C2 communication modes and links information received in the <C2-communication-mode-notification-info> element and then forward the C2 communication modes and links information to the UAS application specific server and upon receiving a C2 communication mode notification acknowledgement from the UAS application specific server, the UAE-S shall generate an HTTP 200 (OK) response according to RFC 9110. In the HTTP 200 (OK) response message, the UAE-S:
  1. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml"; and
  2. shall include an application/vnd.3gpp.uae-info+xml MIME body and in the <UAE-info> root element:
    1. shall include a <C2-communication-mode-notification-info> element with an <acknowledgement> child element indicating the acknowledgement of selected C2 communication mode(s); and
  3. shall send the HTTP 200 (OK) message towards the UAE-C.
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6.3.2.3  UAE-layer assisted dynamic C2 mode switching  p. 13

Upon receiving an HTTP POST request containing:
  1. a Content-Type header field set to "application/vnd.3gpp.uae-info+xml"; and
  2. an application/vnd.3gpp.uae-info+xml MIME body with a <C2-related-trigger-event-report> element,
the UAE-S:
  1. shall obtain a location report for the UAE-C by the SLM-S;
  2. shall determine the switching of the C2 mode from direct to network assisted or vice versa or to USS/UTM navigated;
  3. if the switching of the C2 mode is from direct to network assisted or vice versa, may send a C2 mode switching confirmation request to the UAS application specific server;
  4. if the switching of the C2 mode is from direct to USS/UTM navigated, shall send a C2 mode switching confirmation request to the UAS application specific server; and
  5. the UAE-S shall generate an HTTP 200 (OK) response according to RFC 9110. In the HTTP 200 (OK) response message, the UAE-S:
    1. shall include a Request-URI set to the URI corresponding to the identity of the UAE-C;
    2. shall include a Content-Type header field set to "application/vnd.3gpp.uae-info+xml";
    3. shall include an application/vnd.3gpp.uae-info+xml MIME body with a <C2-operation-mode-switching> element in the <UAE-info> root element which:
      1. shall include a <UAE-server-id> element set to the identifier of the UAE server which instructs the UAS to apply the C2 mode switching;
      2. shall include a <C2-operation-mode-switching-requirement> element indicating the type of the C2 mode switching to be applied;
      3. may include a <time-validity> element set to the time validity for the C2 switching requirement; and
      4. may include a <geographical-area> element indicating the area for which the C2 switching applies; and
    4. shall send the HTTP 200 (OK) message towards the UAE-C.
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