Limit download speed

[Propellerhead]

I use one router to supply Wi-Fi.  Having recently added streaming TV services, I note that during PatchmyPC operation, the latter uses the maximum bandwidth, with the result the TV service is intermittent. 

Would it be possible to limit the bandwidth used for download to a specific figure like 6 Mb/s, alternatively a proportion of total bandwidth like 60%? 

Currently I have PatchmyPC running out of normal hourts to get round this problem but it is not satisfactory.