transmission of all APs and STAs to manage interference. APs are time-synchronized, what can be achieved e.g. by the IEEE 1588 precision time protocol (PTP). The NC aggregates the wireless traffic of STAs and APs. However, its functionality is not part of 802.15.7r1. Only the specific data transport and control signaling needed in the COW topology are defined. Based on cell-specific reference signals, STAs and APs estimate the interference channel in down- and uplink directions, respectively. The corresponding metrics reports are conveyed in the downlink over the wireless uplink and via the APs to the NC and ii) in the uplink via the APs to the NC where it is used for interference coordination and handover. 5.9. Heterogeneous VLC and RF communication Optional techniques for combined VLC and RF communication will be introduced, where a STA is simultaneously connected to an AP using RF communication as well as VLC. MAC layer service primitives enable control information and data to be conveyed between the MAC layer and the upper network layers so the control information and the data can be conveyed to the destination using either one of the two wireless communication media. 5.10. Encryption and Security The MAC protocol is expected to provide encryption and security features using the following set of protocols: 1) Wired Equivalent Privacy (WEP) 2) Temporal Key Integrity Protocol (TKIP) 3) Counter Mode Cipher Block Chaining Message Authentication Code Protocol (CCMP) 5.11. MAC Layer Service Primitives The MAC layer service primitives enable the transfer of data and control information between the MAC layer and the higher networking layers. The following service primitives are defined. 5.11.1 MAC Layer DATA Services 5.11.1.1 MAC-DATA.request 5.11.1.1.1 Function This primitive requests a transfer of an MSDU from a LLC sublayer entity to a single peer LLC sublayer entity, or multiple peer LLC sublayer entities in the case of group addresses or broadcasting. 5.11.1.1.2 Semantics of the service primitive
transmission of all APs and STAs to manage interference. APs are time-synchronized, what can be achieved e.g. by the IEEE 1588 precision time protocol (PTP). The NC aggregates the wireless traffic of STAs and APs. However, its functionality is not part of 802.15.7r1. Only the specific data transport and control signaling needed in the COW topology are defined. Based on cell-specific reference signals, STAs and APs estimate the interference channel in down- and uplink directions, respectively. The corresponding metrics reports are conveyed in the downlink over the wireless uplink and via the APs to the NC and ii) in the uplink via the APs to the NC where it is used for interference coordination and handover. 5.9. Heterogeneous VLC and RF communication Optional techniques for combined VLC and RF communication will be introduced, where a STA is simultaneously connected to an AP using RF communication as well as VLC. MAC layer service primitives enable control information and data to be conveyed between the MAC layer and the upper network layers so the control information and the data can be conveyed to the destination using either one of the two wireless communication media. 5.10. Encryption and Security The MAC protocol is expected to provide encryption and security features using the following set of protocols: 1) Wired Equivalent Privacy (WEP) 2) Temporal Key Integrity Protocol (TKIP) 3) Counter Mode Cipher Block Chaining Message Authentication Code Protocol (CCMP) 5.11. MAC Layer Service Primitives The MAC layer service primitives enable the transfer of data and control information between the MAC layer and the higher networking layers. The following service primitives are defined. 5.11.1 MAC Layer DATA Services 5.11.1.1 MAC-DATA.request 5.11.1.1.1 Function This primitive requests a transfer of an MSDU from a LLC sublayer entity to a single peer LLC sublayer entity, or multiple peer LLC sublayer entities in the case of group addresses or broadcasting. 5.11.1.1.2 Semantics of the service primitive