Method and apparatus for a mobile repeater

• US 6,141,533 A
• Filed: 11/13/1997
• Issued: 10/31/2000
• Est. Priority Date: 11/13/1997
• Status: Expired due to Term

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Wilson, Christopher H., Wilson, Alan L., Gilbert, John M.
• Primary Examiner(s): Trost, William G.
• Assistant Examiner(s): Redmon, Joy K
• Application Number:
  US08/969,722
• Time in Patent Office: 1,083 Days
• Field of Search: 455/11.1, 455/7, 455/17, 455/15, 455/511, 455/16, 455/18, 455/19, 455/20, 455/509, 455/510, 370/327, 370/341
• US Class Current: 455/11.1
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 12/037 of the control plane, e.g. signalling traffic
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A mobile repeater (300) is improved to include a database (303) that allows the mobile repeater to store registrations received from subscriber units. Additionally, the mobile repeater may include a voice on control switching element (309) for use with an extended control channel. Further still, the mobile repeater may include encryption elements (305-308) for the maintenance of encrypted control channels. In this manner, the mobile repeater may provide an improved quality of services to subscriber units.

Claims

1. A mobile repeater comprising:

a mobile transceiver arranged and constructed to communicate with a fixed infrastructure;

a repeater, operably coupled to the mobile transceiver, arranged and constructed to communicate with at least one subscriber unit;

a converter, operably coupled to the mobile transceiver and the repeater, arranged and constructed to convert, when necessary, outbound control channel information, received by the mobile transceiver, to control channel information suitable for transmission via the repeater on an extended control channel and to convert, when necessary, inbound control channel information, received by the repeater, to control channel information suitable for transmission via the mobile transceiver on a control channel.

3. The mobile repeater of claim 1, further comprising a converter operably coupled to the repeater such that the control channel is temporarily converted, from time to time, to a voice channel, thereby yielding the extended control channel.

2. A mobile repeater, wherein a mobile transceiver that communicates with a fixed infrastructure is operably coupled to a repeater that communicates with at least one subscriber unit, the mobile repeater comprising:

a database, operably coupled to the mobile transceiver and the repeater, that stores a registration received from the at least one subscriber unit and that stores an indication that the subscriber unit is registered with the fixed infrastructure, wherein the indication is stored in the database when the registration is sent to the fixed infrastructure via the mobile transceiver; and

a converter, operably coupled to the mobile transceiver and the repeater, arranged and constructed to convert, when necessary, outbound control channel information, received by the mobile transceiver, to control channel information suitable for transmission via the repeater on an extended control channel and to convert, when necessary, inbound control channel information, received by the repeater, to control channel information suitable for transmission via the mobile transceiver.

4. The mobile repeater of claim 2, wherein the converter is arranged and constructed to:

pass outbound information, received by the mobile transceiver, unchanged to the repeater for transmission; and

pass inbound information, received by the repeater, unchanged to the mobile transceiver for transmission.

5. A mobile repeater comprising:

a mobile transceiver arranged and constructed to communicate with a fixed infrastructure;

a repeater, operably coupled to the mobile transceiver, arranged and constructed to communicate with at least one subscriber unit;

a first encryption synchronization device, operably coupled to the mobile transceiver and the repeater, arranged and constructed to generate at least one of inbound subscriber encryption synchronization information and outbound subscriber encryption synchronization information, relative to an encrypted subscriber control channel that provides communications between the at least one subscriber unit and the repeater.

6. The mobile repeater of claim 5, further comprising a second encryption synchronization device, operably coupled to the mobile transceiver and the repeater, arranged and constructed to maintain at least one of inbound infrastructure encryption synchronization information and outbound infrastructure encryption synchronization information, relative to an encrypted infrastructure control channel that provides communications between the fixed infrastructure and the mobile transceiver.

7. The mobile repeater of claim 6, further comprising a decryptor, operably coupled to the mobile transceiver, the repeater, the first encryption synchronization device and the second encryption synchronization device, for decrypting based on at least one of the inbound subscriber encryption synchronization information and the outbound infrastructure encryption synchronization information.

8. The mobile repeater of claim 6, further comprising an encryptor, operably coupled to the mobile transceiver, the repeater, the first encryption synchronization device and the second encryption synchronization device, for encrypting based on at least one of the outbound subscriber encryption synchronization information and the inbound infrastructure encryption synchronization information.

9. In a wireless communication system comprising at least one subscriber unit and at least one mobile repeater, in wireless communication with a fixed infrastructure, wherein the wireless communication system supports services for use by the at least one subscriber unit, a method for a mobile repeater of the at least one mobile repeater to provide the services to a subscriber unit of the at least one subscriber unit, the method comprising steps of:

providing, between the subscriber unit and the mobile repeater, an encrypted subscriber control channel;

generating at least one of inbound subscriber encryption synchronization information and outbound subscriber encryption synchronization information, relative to the encrypted subscriber control channel; and

providing the services to the subscriber unit using at least one of the inbound subscriber encryption synchronization information and the outbound subscriber encryption synchronization information.

10. The method of claim 9, further comprising steps of:

providing, between the fixed infrastructure and the mobile repeater, an encrypted infrastructure control channel;

maintaining at least one of inbound infrastructure encryption synchronization information and outbound infrastructure encryption synchronization information, relative to the encrypted infrastructure control channel; and

providing the services to the subscriber unit using at least one of the inbound infrastructure encryption synchronization information and the outbound infrastructure encryption synchronization information.

11. The method of claim 10, the step of providing the services to the subscriber unit further comprising steps of:

receiving, from the subscriber unit, encrypted inbound control channel information via the encrypted subscriber control channel;

decrypting the encrypted inbound control channel information based on the inbound subscriber encryption synchronization information to provide decrypted inbound control channel information;

encrypting the decrypted inbound control channel information based on the inbound infrastructure encryption synchronization information to provide re-encrypted inbound control channel information; and

transmitting, to the fixed infrastructure, the re-encrypted inbound control channel information via the encrypted infrastructure control channel.

12. The method of claim 10, the step of providing the services to the subscriber unit further comprising steps of:

receiving, from the fixed infrastructure, encrypted outbound control channel information via the encrypted infrastructure control channel;

decrypting the encrypted outbound control channel information based on the outbound infrastructure encryption synchronization information to provide decrypted outbound control channel information;

encrypting the decrypted outbound control channel information based on the outbound subscriber encryption synchronization information to provide re-encrypted outbound control channel information; and

transmitting, to the subscriber unit, the re-encrypted outbound control channel information via the encrypted subscriber control channel.