Content Protection Support in 802.11 Month Year doc.: IEEE 802.11-yy/xxxxr0 November 2007 Content Protection Support in 802.11 Date: 2007-11-12 Authors: Sandra Qin et al., Samsung John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 November 2007 Abstract High definition audio and video applications are becoming popular for WLAN, and content protection requirement is ubiquitous. Due to the characteristics of the wireless media, content protection in wireless LAN requires support from the MAC and PHY layer. The requirement of content protection support and possible working areas in WLAN are presented. Sandra Qin et al., Samsung John Doe, Some Company

Motivation A/V applications are becoming popular in WLAN November 2007 Motivation A/V applications are becoming popular in WLAN Mutlicasting/Broadcasting Video conferencing Real-time Streaming 3D gaming Content protection requirement is ubiquitous Content provider’s content User generated content Content protection support is required from MAC and PHY in WLAN Proximity control Packet-level link protection Fading channel support Roaming support Sandra Qin et al., Samsung

Content Protection Requirement in WLAN November 2007 Content Protection Requirement in WLAN Laptop Camcorder Transmitting to the Internet without permission Copying DC PC User Generated Data AP Recording Content provider’s Data MP3 Player DVD/BD Recorder TV Sandra Qin et al., Samsung

Proximity control requirement November 2007 Proximity control requirement Content needs to be constrained to a certain range. For example, within the black circle. Sandra Qin et al., Samsung

Proximity control requirement November 2007 Proximity control requirement Content needs to be limited to a certain vicinity Examples of requirement Digital Transmission Content Protection (DTCP) Round Trip Time (RTT) less than 7ms Proximity control in WLAN Current WLAN technology can be used to broadcast content to large vicinity The area covered can raise concern for spreading copyright protected content Random access delay and long connection setup prevent accurate RTT measurement Possible new work: Support more accurate round trip time measurement Distance measurement based on signal strength and channel model Other methods Sandra Qin et al., Samsung

Support Packet Level Content Protection November 2007 Support Packet Level Content Protection Mapping existing content protection protocols to WLAN Digital Transmission Content Protection (DTCP) High-bandwidth Digital Content Protection (HDCP) Stream based v.s. Packet based WLAN needs to support packet level content protection Copy right control bits Cipher suite negotiation Etc. Work done in other TGs TG i and TG w Protect data packets and management frames against hackers No copy right control, users can easily violate rules Copy watch-only video packets Possible new work Mechanisms to support content protection at MAC packet level Sandra Qin et al., Samsung

Content protection with fading channels November 2007 Content protection with fading channels Channel fading causes unreliable transmission Bit error can cause false alert Retransmissions causes delay Possible new work Robust transmission of important CP information Error propagation prevention Effect of delay and delay jitter on AV applications Sandra Qin et al., Samsung

Roaming support for content protection November 2007 Roaming support for content protection Mobile devices move from one BSS to another BSS Mobile devices move from WLAN to other networks Possible new work Background proximity control CP status maintaining when roaming Authentication handover support Interaction with link protection from external networks Sandra Qin et al., Samsung

Protocol stack November 2007 AP/Station Station Content Protection CP support req/rsp CP support req/rsp CP functions: Proximity control, right control etc. MAC/PHY MAC/PHY Sandra Qin et al., Samsung

November 2007 Summary Content protection is becoming a crucial issue for AV applications for WLAN. Content protection requires support from MAC and PHY layers in WLAN. Proximity control Packet level right control Fading channel support Roaming support Lack of such support in current WLAN solutions. Call for discussion. Sandra Qin et al., Samsung

November 2007 Straw Polls Should 802.11 WNG receive further presentations on the topic of content protection support? Sandra Qin et al., Samsung

References DTCP specification Vol. 1 HDCP specification Revision 1.3 November 2007 References DTCP specification Vol. 1 HDCP specification Revision 1.3 Standard 802.11-2007 – WLANs Standard 802.11i -2004 – WLAN MAC security enhancement Draft 802.11s D1.05 – ESS Mesh Networking Draft 802.11u D1.0 – Interworking with External Networks Draft 802.11w D2.0, – Protected Management Frames Sandra Qin et al., Samsung