Method and system for ensuring authorized operation of a communication system as a secondary user

• US 8,832,797 B2
• Filed: 02/27/2009
• Issued: 09/09/2014
• Est. Priority Date: 02/27/2009
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola Solutions, Inc.
• Inventors: Ekl, Randy L., Metke, Anthony R., Oberlies, Bruce D.
• Primary Examiner(s): Zand, Kambiz
• Assistant Examiner(s): Woldemariam, Nega
• Application Number:
  US12/394,561
• Publication Number:
  US 20100223659A1
• Time in Patent Office: 2,020 Days
• Field of Search: 726/9, 726/26, 726/27, 726/28, 726/29, 713/224, 713/201, 713/212, 713/213, 713/220, 713/223, 709/204, 709/201, 709/220, 709/227, 707/600, 707/607, 707/608, 707/609, 707/687, 707/821, 380/200, 380/201, 380/202, 380/293, 380/227
• US Class Current: 726/4
• CPC Class Codes: H04L 63/0823 using certificates cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263
• CPC Class Codes: H04W 12/069 using certificates or pre-shared keys
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

A communication system (100) is facilitated by an access node (102) to support communication with subscriber units (104, 106) as secondary users of a regulated spectrum portion. The access node requests permission to operate as a secondary user from an authorization server (118). The authorization server provides authorized transmission parameters based on characteristics of the access node. The access node operates according to the authorized transmission parameters and provides the parameters to eligible subscriber units.

Claims

1. A method for obtaining transmission permission in a regulated spectrum, comprising:

transmitting, from an access node to an authorization server, a request for authorized transmission parameters, the request indentifying the access node and including a location of the access node wherein, the request is signed with a digital certificate that is issued by a certificate authority associated with the authorization server;

receiving from the authorization server at the access node the authorized transmission parameters, wherein the authorized transmission parameters are based at least in part on the location of the access node and known licensed users in the location of the access node, and are specific to the access node, and wherein the access node then operates in accordance with the transmission parameters;

receiving an association request from a subscriber unit at the access node; and

transmitting from the access node an association approval to the subscriber unit, including the authorized transmission parameters, wherein the subscriber unit commences communication activity using the authorized transmission parameters.

2. The method of claim 1, wherein transmitting the request comprises transmitting an authenticatable request.

3. The method of claim 1, wherein the transmission parameters are by the authorization server with a digital certificate issued by the certificate authority associated with the authorization server.

4. The method of claim 1, wherein the digital certificate is stored in the access node in a non-modifiable memory.

5. The method of claim 1, wherein receiving the transmission parameters further comprises receiving a digital certificate to authenticate the transmission parameters.

6. The method of claim 1 wherein transmitting the request comprises transmitting a request to operate as a secondary user of a reserved spectrum band.

7. The method of claim 6, wherein the reserved spectrum band is reserved for television broadcast, and wherein the authorized transmission parameters includes an indication of open television channels that may be used by the access node and associated subscriber units.

8. The method of claim 1, wherein the authorized transmission parameters include an augmented transmission power limit that is higher than a default power limit, wherein the access node and subscriber unit use the augmented transmission power limit to transmit at a power level higher that the default power limit.

9. The method of claim 1 wherein receiving the association request comprises receiving a digital certificate from the subscriber unit, the digital certificate being issued by a certificate authority associated with the authorization server.

10. The method of claim 9, wherein the association approval is signed by the access node with a certificate issued by the certificate authority associated with the authorization server.

11. A wireless communication access node, comprising:

a transceiver for receiving and transmitting radio signals;

a memory including a non-modifiable portion having a digital certificate stored within the non-modifiable portion;

a controller operably coupled to the transceiver and memory which executes instruction code stored in the memory which configures the access node to;

transmit, from the access node to an authorization server, an authenticable request for authorized transmission parameters, wherein the request identifies the access node and includes a location of the access node and is signed with the digital certificate, wherein the digital certificate issued by a certificate authority associated with the authorization server;

receive from the authorization server at the access node the authorized transmission parameters, wherein the authorized transmission parameters are based at least in part on the location of the access node, and wherein the access node then operates in accordance with the transmission parameters;

receive an association request via the transceiver from a subscriber unit at the access node; and

transmit an association approval to the subscriber unit, including the authorized transmission parameters, wherein the subscriber unit commences communication activity with the access node according to the authorized transmission parameters.

12. The access node of claim 11, wherein the transmission parameters are signed by the authorization server with a digital certificate issued by the certificate authority.

13. The access node of claim 11, wherein the request includes a request to operate as a secondary user of a reserved spectrum band.

14. The access node of claim 13, wherein the reserved spectrum band is reserved for television broadcast, and wherein the authorized transmission parameters include an indication of open television channels that may be used by the access node and associated subscriber units.

15. The access node of claim 11, wherein the authorized transmission parameters include an augmented transmission power limit that is higher than a default power limit, wherein the access node and subscriber unit use the augmented transmission power limit to transmit at a power level higher that the default power limit.

16. The access node of claim 11 wherein the association request is signed by the subscriber unit with a digital certificate issued by the certificate authority.

17. The access node of claim 16, wherein the association approval is signed by the access node with a certificate issued by the certificate authority.

18. A method of ensuring authorized operation of subscriber units in a communication system as secondary users of a reserved spectrum portion, comprising:

obtaining, at an access node of the communication system, authenticated transmission parameters from an authorization server, wherein the transmission parameters define a transmission operating regime to be used by the communication system in the reserved spectrum portion;

requesting association by a subscriber unit to the access node;

transmitting a digital certificate including the transmission parameters by the access node to the subscriber unit while granting the requested association;

authenticating the transmission parameters by the subscriber unit using a public key of the certification authority trusted by the authorization server; and

configuring the transceiver of the subscriber unit in accordance with the authenticated transmission parameters.

19. The method of claim 18, wherein the reserved spectrum portion is a television spectrum portion, obtaining the authenticated transmission parameters includes submitting a location of the access node to the authorization server and receiving in the authenticated transmission parameters an identification of a vacant television channel in which the communication system is to operate.

20. The method of claim 18, wherein obtaining the authenticated transmission parameters comprises transmitting a request for the authenticated transmission parameters from the access node to the authorization server, and wherein the request includes a public key of the access node and a public key of the certificate authority, and wherein the public key of the certificate authority is stored in a non-modifiable memory of the access node.

21. The method of claim 18, further comprising:

requesting, by the subscriber unit, a signature of the access node after receiving the transmission parameters from the access node; and

prior to authenticating, accessing the transmission parameters using the signature of the access node by the subscriber unit.

22. The method of claim 18, wherein requesting association by the subscriber unit comprises transmitting an association request including a digital certificate issued by a certificate authority associated with the authorization server.