Upon receiving a Configure Dynamic Group request from a V2X application specific server (see
TS 29.486) the VAE-S shall assign a ProSe Layer-2 Group ID to the received dynamic group information from the available ProSe Layer-2 Group ID pool. Then the VAE-S shall generate an HTTP PUT request message according to procedures specified in
RFC 7231. In the HTTP PUT request message, the VAE-S:
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shall include a Request-URI set to the URI corresponding to the identity of the VAE-C of the group leader;
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shall include a Content-Type header field set to "application/vnd.3gpp.vae-info +xml";
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shall include an application/vnd.3gpp.vae-info+xml MIME body with a <layer2-group-id-mapping> element in the <VAE-info> root element which shall include:
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a <dynamic-group-info> element which shall include:
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a <dynamic-group-id> element set to the identity of the dynamic group;
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a <group-definition> element set to information about the V2X group; and
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a <group-leader-id> element set to the identity of the group leader; and
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a <prose-layer2-group-id> element corresponding to the dynamic group information; and
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shall send the HTTP PUT request message towards the VAE-C according to RFC 7231.
Upon receiving an HTTP PUT request message containing:
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a Content-Type header field set to "application/vnd.3gpp.vae-info +xml"; and
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an application/vnd.3gpp.vae-info+xml MIME body with a <layer2-group-id-mapping> element in the <VAE-info> root element;
the VAE-C shall store the content of the
<layer2-group-id-mapping> element and may further announce the dynamic group information including the corresponding ProSe Layer-2 Group ID to the other VAE clients within the PC5 communication proximity on a PC5 channel dedicated for V5-AE communications, enabling more V2X UEs to join the dynamic group.