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Valid CCNA or any CCIE Certification can act as a pre-requisite.

Cisco Certified Network Associate Wireless (CCNA® Wireless)

640-721 IUWNE Implementing Cisco Unified Wireless Networking Essentials (IUWNE)

The fowling excert is taken from the Cisco Website

Cisco Certified Network Associate Wireless (CCNA® Wireless) validates associate-level knowledge and skills to configure, implement and support of wireless LANs, specifically those networks using Cisco equipment. With a CCNA Wireless certification, network professionals can support a basic wireless network on a Cisco WLAN in a SMB to enterprise network.

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