You can now attach a dataset to your paper during the submission process. This is handled by IEEE DataPort, which currently allows IEEE authors to upload up to 2TB of data related to their article. Uploading your dataset in this way will get more exposure to your data-based research, allow you to store valuable datasets that require long-term storage and accessibility, and give reviewers access to your datasets to verify your work.
If your paper is accepted, your dataset will appear in IEEE Xplore together with your paper, similar to the following screenshot:
To upload your data, please answer "Yes" to the following question in the submission system, and follow the instrucitons:
Do you have DATA associated with your article? (choose Yes)