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IEEE 802.21 Information Server (IS) Networks may support means to determine, help in determining or provide the location to the clients at various layers Link layer specific ones: LLDP[-MED], U-TDoA, D-TDoA Link layer agnostic ones: DHCP, OMA SUPL, RELO, HELD (HTTP based) Other SDOs defined different LCPs Service providers need flexibility on how location services are offered in their network IEEE 802.21 provides a logical place to support a comprehensive list of all support options using IS |