Radio channel allocation for national security and emergency preparedness calls

• US 7,236,791 B2
• Filed: 06/30/2005
• Issued: 06/26/2007
• Est. Priority Date: 06/30/2005
• Status: Expired due to Fees

• Current Assignee: RPX Corporation
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Lopez, Ismael, Quintero, Rafael, Riley, Douglas Harvey, Chambers, Michael Dwayne, Huang, Renling Lawrence
• Primary Examiner(s): BEAMER, TEMICA M
• Application Number:
  US11/172,659
• Publication Number:
  US 20070004421A1
• Time in Patent Office: 726 Days
• Field of Search: 455/453, 455/436, 455/466, 455/414.1, 455/452.2, 370229-236
• US Class Current: 455/450
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 72/29 between an access point and the access point controlling device
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 8/18 Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data

Abstract

The present invention relates to wireless telephone networks, and more particularly to the allocation of radio channels to calls in CDMA-based systems when their Radio Access Networks (RAN) are congested. A Base Station (BS) receives a call origination from a mobile device. The BS communicates information about the call and about its radio availability to a Mobile Switching Center (MSC). The MSC determines the priority of the call and how the call should be treated by the BS based on the supplied information. The MSC communicates the treatment information and the priority information back to the BS.

When the RAN is congested, high-priority calls are queued. These high-priority calls are served based on allocation specification in which radio channels may be assigned to low-priority calls, which are not queued, while there are still calls in the queue.

Claims

1. A method for establishing a connection for a wireless call over a radio channel in a radio spectrum, the method comprising:

receiving a call origination message from a mobile device at a base station;

creating a base station origination message comprising congestion state information for the base station, call type information, and a request for priority information for the wireless call, wherein the congestion state for the base station may be (a) that there are no available radio channels at the base station, (b) that the available resources are limited and if a call connection is established it may be subject to interference from other calls, or (c) that there are sufficient radio channels available to establish a connection for the wireless call, and wherein the call type information identifies the wireless call as a high-priority Wireless Priority Service (WPS) call or a low-priority public call;

sending the base station origination message to a mobile switching center;

receiving a first setup message comprising call treatment information and the requested priority information from the mobile switching center sent in response to the base station origination message; and

processing the wireless call as a high-priority call or as a low-priority call according to the processing information in the setup message.

2. The method of claim 1 further comprising the step of placing the call on a queue if it is high-priority and no radio channels are available for establishing a connection.

3. The method of claim 2 further comprising the step of establishing a call connection on an available radio channel, wherein, if there are high-priority calls on the queue, the call connection is established in accordance with a predetermined pattern.

4. The method of claim 3 wherein the pattern is to establish connections for a first number of high-priority calls and then establish connections for a second number of low-priority calls.

5. The method of claim 4 wherein a connection for a high-priority call on the queue is established out of turn if a radio channel becomes available and there are no low-priority calls.

6. The method of claim 5 further comprising the steps of

incrementing a counter if the connection is established, out of turn, for one of the high-priority calls on the queue;

and

decrementing the counter if the connection is established, out of turn, for a low-priority call, the counter has a value greater than 1, and there are no high-priority calls in the queue.

7. The method of claim 6 wherein the request for the priority information is included in the base station origination message based on whether the queue is empty and the value of the counter.

8. The method of claim 1 wherein the call type information in the origination message identifies the call as a high-priority call or a low-priority call and further comprising the steps of:

placing the call on a queue if it is high-priority and no radio channels are available for establishing a connection;

sending a dequeue message to the mobile switching center when the call is removed from the queue; and

receiving a second setup message from the mobile switching center; and

establishing the connection for the call.

9. A method for providing information necessary for establishing a connection for a wireless call over a radio channel in a radio spectrum, the method comprising:

receiving from a base station a base station origination message comprising congestion state information, call type information, and a request for priority information for the wireless call, wherein the congestion state for the base station may be (a) that there are no available radio channels at the base station, (b) that the available resources are limited and if a call connection is established it may be subject to interference from other calls, or (c) that there are sufficient radio channels available to establish a connection for the wireless call, and wherein the call type information identifies the call as a high-priority Wireless Priority Service call or a low-priority public call;

determining call treatment information based on the congestion state information and the call type information for the wireless call;

creating a first setup message comprising call the treatment information and the requested priority information;

determining whether the wireless call should be processed by the base station as a high-priority call or a low-priority call; and

sending the first setup message to the base station.

10. The method of claim 9 further comprising the step of allocating memory for the wireless call when the base station origination message is received.

11. The method of claim 10 further comprising:

checking if there is allocated memory for an older wireless call originated from the same mobile device as the wireless call;

releasing memory allocated to the older wireless call if it is a high-priority call; and

releasing memory allocated to the wireless call if the older wireless call is a low-priority call.

12. The method of claim 11 further comprising the steps of:

verifying that a dialed number begins with a predefined pattern;

checking in a locally stored subscriber profile whether a subscriber originating the wireless call can originate a high-priority call; and

if there is no locally stored subscriber profile, checking in a remotely stored subscriber profile whether the subscriber originating the wireless call can originate a high-priority call.

13. The method of claim 11 further comprising the steps of:

determining whether the wireless call is an emergency call;

if the wireless call is not an emergency call, checking subscriber profile; and

if the wireless call is an emergency call bypassing the step of checking the subscriber profile.

14. A system for establishing a connection for a wireless call over a radio channel in a radio spectrum, system comprising:

a base station operative to;

receive a call origination message from a mobile device;

create a base station origination message comprising congestion state information for the base station, call type information, and a request for priority information for the wireless call, wherein the congestion state for the base station may be (a) that there are no available radio channels at the base station, (b) that the available resources are limited and if a call connection is established it may be subject to interference from other calls,or (c) that there are sufficient radio channels available to establish a connection for the wireless call, and wherein the call type information identifies the call as a high-priority Wireless Priority Service (WPS) call or a low-priority public call;

send the base station origination message to a mobile switching center;

wherein the mobile switching center is operative to;

receive a first setup message comprising call treatment information and the requested priority information from the mobile switching center sent in response to the base station origination message; and

process the wireless call as a high-priority call or as a low-priority call according to the processing information in the setup message.

15. A system for providing information necessary for establishing a connection for a wireless call over a radio channel in a radio spectrum, the system comprising:

means for receiving from a base station a base station origination message comprising congestion state information for the base station and call type information for the wireless call, wherein the congestion state for the base station may be (a) that there are no available radio channels at the base station, (b) that the available resources are limited and if a call connection is established it may be subject to interference from other calls, or (c) that there are sufficient radio channels available to establish a connection for the wireless call, and wherein the call type information identifies the call as a high-priority Wireless Priority Service (WPS) call or a low-priority public call;

means for determining call treatment information based on the congestion state information, the call type information for the wireless call, and a request for priority information for the wireless call;

means for creating a first setup message comprising call the treatment information and the requested priority information; and

means for sending the first setup message to the base station.