http://indianexpress.com/article/explained/india-china-standoff-sikkim-doka-la-simply-put-where-things-stand-on-the-dolam-plateau-4763892/
Can the troops continue to stay there even in winter?
Yes. Harsh as the weather is at that altitude in winter, both Indian and Chinese troops are accustomed to these conditions. The logistics supply lines and turnover of men is also not a problem because the deployment is only a short distance away from the Indian positions at Doka La.