How to Relinquish or Deregister a Grant

This guide explains how to implement Relinquishment and Deregistration procedures as defined in WINNF-TS-0016.

Overview

• Relinquishment: Releases a specific Grant (identified by grantId) so the spectrum can be reused by the CBSD or others. Use when you no longer need a channel (e.g., switching channels or shutting down).
• Deregistration: Completely removes the CBSD from the SAS database. Use when the CBSD is permanently decommissioned or relocated with new parameters requiring re-registration.

Both are voluntary actions initiated by the CBSD.

Prerequisites

• Valid cbsdId (from registration)
• For Relinquishment: Valid grantId in GRANTED or AUTHORIZED state

Relinquishment Procedure

Step 1: Construct the RelinquishmentRequest

Required Parameters

Example JSON

{
  "relinquishmentRequest": [
    {
      "cbsdId": "SAS123/CBSD-001",
      "grantId": "GRANT-789"
    }
  ]
}

Step 2: Send the Request

• HTTPS POST to SAS relinquishment endpoint
• Mutual TLS authentication

Step 3: Process the RelinquishmentResponse

Key Parameters

Common responseCode Values

Example Response

{
  "relinquishmentResponse": [
    {
      "cbsdId": "SAS123/CBSD-001",
      "grantId": "GRANT-789",
      "response": {
        "responseCode": 0,
        "responseMessage": "Success"
      }
    }
  ]
}

Tip: Always relinquish grants before requesting new ones on overlapping frequencies to avoid conflicts.

Deregistration Procedure

Step 1: Construct the DeregistrationRequest

Required Parameters

Example JSON

{
  "deregistrationRequest": [
    {
      "cbsdId": "SAS123/CBSD-001"
    }
  ]
}

Step 2: Send the Request

• HTTPS POST to SAS deregistration endpoint
• Mutual TLS authentication

Tip: Relinquish all active grants first to ensure clean shutdown.

Step 3: Process the DeregistrationResponse

Key Parameters

Common responseCode Values

Example Response

{
  "deregistrationResponse": [
    {
      "cbsdId": "SAS123/CBSD-001",
      "response": {
        "responseCode": 0,
        "responseMessage": "Success"
      }
    }
  ]
}

Best Practices & Tips

• Relinquish grants immediately when no longer needed — frees spectrum faster and improves approval odds for future requests.
• Deregister only for permanent removal; otherwise, keep registration active across reboots.
• Perform relinquishment/deregistration during graceful shutdown sequences.
• After successful deregistration, the CBSD must re-register from scratch if reactivated.
• Log responses to confirm clean release and avoid "ghost" grants.

Common Issues & Troubleshooting

Next Steps

• After relinquishment: Request new grants if needed
• After deregistration: Re-register if bringing CBSD back online