Wimax standards and Security The Wimax

Privacy Sublayer

Privacy sublayer is a separate security sublayer that provides secure key exchange and encryption. Privacy sublayer has two main protocols

1. 
   An encapsulation for encrypting packet data across the 802.16 network.
   
2. 
   A privacy key management (PKM) protocol to facilitate secure dis- tribution of the keying data from the BS to the SS. PKM is enhanced by adding digital-certified-based SS authentication to be used in the
   

802.16 architecture.

PKM is used in security association, which is a set of cryptographic methods and the associated keying material. 802.16 defines three types of security

association—primary, static, and dynamic. Primary security association is established during the SS initialization. Static service association is provi- sioned within the BS while dynamic security association is initiated and termi- nated on demand in a response of initiation and termination of service flows.

2.5 IEEE 802.16e-2005
On July 2002, a study group called IEEE 802.16 Mobile WirelessMAN Task Group was initiated to produce an amendment covering the PHY and MAC layers for combined, fixed, and mobile operations in the licensed band range. The amendment was approved in December 2005 and the new standard called IEEE 802.16e-2005 was published in February 2006. The scope of this standard is to provide mobility enhancement support for SS moving at the vehicu- lar speed, in addition to corrections to 802.16-2004 fixed operation that was developed as IEEE 802.16-2004/Cor1-2005 and published along with IEEE 802.16e-2005. 802.16e (IEEE 802.16e-TG, 2006) introduces many changes to PHY and MAC layer protocols owing to mobility support, which required addressing new issues that were not required in 802.16-2004, such as handoff and power management.

1.