How do I address research gaps in my Thesis (Research article)? I have gone through some papers and Ph.D theses in my field but haven't found an explicit discussion about the 'research gap' in their field.

Can anyone give me an example where the author discusses their research gap in detail?

For example: my working domain is 'Networking' and the gap I am addressing is about precise time synchronization requirements. How can I write this in a convincing way that raises it to an issue that should be addressed? 

I have got a comment from a reviewer where the reviewer says,


  One thing I was wondering while reading: If the time synchronization
  is such a big issue as described in the paper, why is it rarely
  mentioned as an issue in other experimental papers.


So I need to address his comment by explicitly saying that, it is the 'research gap' I worked on to cover on that paper. Although the significance, benefits, and others are well mentioned in the paper. But somewhere in the paper, I have to demand that this is 'research/knowledge gap' where work needs to do. 

The expression that I have adopted so far: 


  Until now, there has been little work [references]
  in specifying or detailing the importance of time synchronization and
  the stringent timing requirements for Vehicular Ad Hoc Networks. In
  its underline reason we believe, as the time, time quality and
  synchronization techniques in VANET have been adopted straightforward
  by following the WLAN (Wireless Local Area Network) standards, it gets
  the impression of settling down with the achieved developments already
  in WLAN. But WLAN is an infrastructure centered asynchronous network
  where the Access Points (APs) are fixed infrastructures that enable
  and support routing and communication among low mobility wireless
  nodes. Such networks are not time critical; therefore, neither precise
  time synchronization is required nor be achieved due to the message
  transmission and various layer level delays of the system. Compared
  with that, VANET consists of both infrastructure based (V2I) and
  ad-hoc based (V2V) communication. This two sets of communication make
  the system more challenging. VANET is also exclusively time critical
  due to its unique characteristics such as high mobility, ad-hoc based
  dynamic topology, and bandwidth constraint. Road efficiency and life
  depend on the successful deployment of any such networks. Hence, the
  synchronization issues in VANET need to be explored in details are
  discussed in this section.
I have not written an expansive issue such as a Ph.D paper or article. But here is how I would approach the problem:


Identify the current literature on the topic in question, in effect a literature review. Is the gap even a gap? Was there discussion in the past, but not now? Depending on your findings then you can claim that 



  Based on my findings, I believe that there is a gap based on the following...



How would you approach in measuring/defining/articulating this gap? Is this a conceptual gap that is not discussed in detail, therefore there is not sufficient interest in it, or it was stipulated as a closed-case?



  Based on John Smith, et.al, this [topic] was discussed in length and defined as the following... using these metrics I introduce an alternative means of measuring its effects and impact on the field...



What do you ultimately wish to do once you identified the problem? Procure more research funding, collaborate with experts?