Due to their installation and management simplicity, Wireless Mesh Networks (WMNs) have become a natural way to deliver wireless coverage for local, campus and metropolitan areas. In order to provide backhaul support, it is necessary to enhance the capacity of WMNs. In this paper, a scalable link quality routing protocol for multi-radio WMNs is proposed. We incorporate a local link quality metric and multi-radio support in the OLSR (Optimized Link State Routing) protocol. This simple and scalable approach helps to find shortest paths with better quality. Simulations were conducted and the results showed expressive performance improvements of the proposed protocol over the original OLSR, with a minimum overhead increase. 10531058IEEE 802.15 WPAN™ Task Group 5, , http://www.ieee802.org/15/pub/TG5.html, AvailableIEEE 802.11s TG, Status of Project IEEE 802.11s "ESS Mesh Networking", , http://grouper.ieee.org/groups/802/11/Reports/tgs_update.htm, AvailableIEEE 802.16's Relay Task Group, , http://grouper.ieee.org/groups/802/16/relay/index.html, AvailableWaharte, S., Boutaba, R., Iraqui, Y., Ishibashi, B., Routing protocols in wireless mesh networks: Challenges and design considerations (2006) Multimedia Tools and Applications, 29 (3), pp. 285-303. , Springer Netherlands, JunGupta, P., Kumar, P.R., The capacity of wireless networks (2000) IEEE Trans. Information Theory, 46, pp. 388-404. , MarGong, M.X., Midkiff, S.F., Mao, S., A cross-layer approach to channel assignment in wireless ad hoc networks (2007) Mobile Networks and Applications, 12, pp. 43-56. , JanKyasanur, P., Vaidya, N.H., Routing and interface assignment in multi-channel multi-interfece wireless networks (2005) IEEE WCNC, 4, pp. 2051-2056. , New Orleans, USA, MarY. Qu, C.-H. Lung, and A. Srinivasan, Multi-channel OLSR with dedicated control interface, in SPECTS, Calgary, Canada, Jul-Aug. 2006Raniwala, A., Chiueh, T., Architecture and algorithms for an IEEE 802.11-based multi-channel wireless mesh network (2005) IEEE Infocom, pp. 2223-2234. , Miami, USA, MarAlicherry, M., Bathia, R., Li, L., Joint channel assignment and routing for throughput optimization in multi-radio wireless mesh networks (2005) ACM Mobicom, pp. 58-72. , Cologne, Germany, pp, Aug-SeptAkyildiz, I.F., Wang, X., Wang, W., Wireless mesh networks: A survey (2005) Computer Networks Journal (Elsevier), 47 (4), pp. 445-487. , MarKyasanur, P., Vaidya, N.H., Routing and link-layer protocols for multi-channel multi-interface ad hoc wireless networks (2006) ACM Mobile Computing and Communications Review, 10, pp. 31-43. , JanClausen, T., Jacquet, P., (2003) Optimized link state routing protocol (OLSR), , IETF RFC 3626, Oct(1999) IEEE Standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, IEEE 802.11 WG, ISO/IEC 8802-11:1999, IEEE Std. 802.11(2004) IEEE Standard for Local and Metropolitan Area Networks - Part 16: Air Interface for Fixed Broadband Wireless Access Systems, IEEE Std. 802.16-2004Ogier, R., Templin, F., Lewis, M., (2004) Topology dissemination based on reverse-path forwarding (TBRPF), , IETFRFC 3684, FebPerkins, C., Belding-Royer, E., Das, S., (2003) Ad hoc on-demand distance vector (AODV) Routing, , IETF RFC 3561, JulJohnson, D.B., Maltz, D.A., Hu, Y., The dynamic source routing protocol for mobile ad hoc networks (DSR) (2004) IETF Internet Draft, , JulCouto, D.S.J.D., Aguayo, D., Bicket, J., Morris, R., A high throughput path metric for multi-hop wireless routing (2003) ACM Mobicom, pp. 419-434. , San Diego, USA, pp, SeptDraves, R., Padhye, J., Zill, B., Routing in multi-radio, multi-hop wireless mesh networks (2004) ACM Mobicom, pp. 114-128. , Philadelphia, USA, pp, Sept-OctYang, Y., Wang, J., Kravets, R., Designing routing metrics for mesh networks (2005) IEEE WiMesh, , Santa Clara, USA, SeptSubramanian, A.P., Buddkihot, M.M., Miller, S., Interference aware routing in multi-radio wireless mesh networks (2006) IEEE WiMesh, , Reston, USA, SeptM. Bahr, Proposed routing for IEEE 802.11s WLAN mesh networks, in WICON, Boston, USA, Aug. 2006OLSR implementation, , http://hipercom.inria.fr/OOLSR, Hipercom Project, INRIA, AvailableNetwork Simulator NS-2, , http://www.isi.edu/nsnam/ns, AvailableWireless mesh network solution, , http://products.nortel.com/go/solution_content.jsp?segld=0& parld=0&prod_id=47160&locale=en-US, AvailableCisco Systems, Outdoor wireless network solution. Available: http://www. ci sco. com/go/wirelessmeshBelAir, Networks, , http://www.belairnetworks.com, AvailableMicrosoft, Microsoft research mesh networks projetct, , http://research.microsoft.com/mesh, AvailableD. Passos, D. V. Teixeira, D. C. Muchaluat-Saade, L. C. S. Magalhães, and C. V. N. Albuquerque, Mesh network performance measurements, in I2TS, Cuiabá, Brazil, pp. 48-55, Dec. 2006Bicket, J., Aguayo, D., Biswas, S., Morris, R., Architecture and evaluation of an unplanned 802.1 lb mesh network (2005) ACM MobiCom, pp. 31-42. , Cologne, Germany, pp, Aug-Sept