Daniel W Carter

US Patent:

6442157, Aug 27, 2002

Filed:

Sep 23, 1999

Appl. No.:

09/404121

Inventors:

Daniel T. Carter - Plano TX
Regena Lee Richardson - Sachse TX
Jill R. Baumann - Wylie TX

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B 7212

US Classification:

370347, 370333, 714774, 455 63, 455513

Abstract:

A system and method for quality-driven channel selection in a communication network that measures interference on idle and active voice channels in a first quality-driven channel selection (QCS) cell is disclosed. A voice channel queue is automatically ordered based on a clearest voice channel which is determined by a reverse bit error rate (RBER) measurement and a forward bit error rate (FBER) measurement on the active voice channels and by an idle noise measurement on the idle voice channels. Further, dynamic channel sets (DCS) are created from the voice channel queue based on the RBER, FBER, and idle noise received, where the DCS are queues that include low interference channels and moderate interference channels.

US Patent:

6701148, Mar 2, 2004

Filed:

Dec 21, 1999

Appl. No.:

09/468551

Inventors:

James E. Wilson - Richardson TX
Daniel Carter - Plano TX

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04Q 720

US Classification:

455436, 455437, 455439, 455442, 455444, 370331, 370332

Abstract:

A cellular network having an radio frequency (RF) management capability includes a mobile switching center, at least one base station controller operative coupled to the mobile switching center, and at least one base station operatively coupled to the at least one base station controller. The at least one base station is for being operatively coupled with at least one mobile station for carrying out at least one mobile communications call. Lastly, a radio frequency manager is operatively coupled to the at least one base station, in conjunction with the at least one mobile station. The RF manager is further for managing a handoff upon the occurrence of a prescribed event, the handoff including a handoff-to-self via a simultaneous base station radio and mobile station frequency transition.

US Patent:

62195549, Apr 17, 2001

Filed:

Sep 4, 1998

Appl. No.:

9/148378

Inventors:

Srinivas Eswara - Carrolton TX
Daniel Thomas Carter - Plano TX
Michael John McCarthy - University Park TX
Shalini Periyalwar - Ottawa, CA
James Eric Wilson - Richardson TX

Assignee:

Nortel Networks Limited - Montreal

International Classification:

H04Q 720
H04B 1500
H04B 100

US Classification:

455452

Abstract:

A Dynamic Frequency Association ("DFA") techniques comprising fixed channel allocation ("FCA") and distributed channel borrowing techniques using a segregation scheme is described. The DFA technique can be used autonomously to dynamically determine the best channels for a cell cluster. Additionally, a method of minimizing search delays at channel assignment by employing a channel usage history is disclosed. In one aspect, as in FCA, each cell is assigned its nominal channels, if any, from the available frequency spectrum, with a fixed radio assigned to each of these frequencies, respectively. Additionally, in accordance with the teachings of the present invention, each cell is equipped with one or more radios designated as "DFA radios". In operation, idle DFA radios scan channels that may be borrowed in order to build a probability matrix. This enables the cell to determine which channels to use for traffic prior to actual channel request by a mobile.