Method of transporting speech information in a wireless cellular system
First Claim
1. In a wireless radio communications system having a plurality of origination ports and destination ports in which an origination port having a speech compression format for communication with an origination base station and a destination port having a speech compression format for communication with a destination base station, communicate with each other through the base stations, the base stations communicating with each other through a switching center, and wherein each of the origination port speech compression formats may not be compatible with each of the destination port speech compression formats, a method of transporting speech information between the origination base station and the destination base station comprising the steps of:
- receiving a data stream from the origination port containing digitized, compressed speech in the origination port speech compression format;
determining compatibility of the destination port speech compression format with the origination port speech compression format by sending information between the origination base station and the destination base station in user-user data messages;
if the destination port speech compression format is determined to be compatible with the origination port speech compression format, creating packets of compressed digital signals in accordance with the origination port speech compression format;
transmitting the packets of compressed digital signals from the origination port to the destination port through the origination base station, switching center and destination base station.
10 Assignments
0 Petitions
Accused Products
Abstract
A method of transporting speech information over a wireless cellular communications system is provided. By determining the existence and compatibility of the destination port with the origination port in a given telephone call, the present invention is capable of using only one compression step and one decompression step. Accordingly, voice signal degradation and delay associated with multiple compression/decompression steps may be reduced.
94 Citations
19 Claims
-
1. In a wireless radio communications system having a plurality of origination ports and destination ports in which an origination port having a speech compression format for communication with an origination base station and a destination port having a speech compression format for communication with a destination base station, communicate with each other through the base stations, the base stations communicating with each other through a switching center, and wherein each of the origination port speech compression formats may not be compatible with each of the destination port speech compression formats, a method of transporting speech information between the origination base station and the destination base station comprising the steps of:
-
receiving a data stream from the origination port containing digitized, compressed speech in the origination port speech compression format; determining compatibility of the destination port speech compression format with the origination port speech compression format by sending information between the origination base station and the destination base station in user-user data messages; if the destination port speech compression format is determined to be compatible with the origination port speech compression format, creating packets of compressed digital signals in accordance with the origination port speech compression format; transmitting the packets of compressed digital signals from the origination port to the destination port through the origination base station, switching center and destination base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method of transporting speech information in a wireless radio telephony system between a plurality of source radio telephony subscriber units and destination subscriber units which may not be compatible with each other comprising the steps of:
-
paging a destination subscriber unit from a source base station via a switching center and a destination base station in response to call initiation from a source radio telephony subscriber unit; sending an in-band initialization pattern from the destination base station to the source base station to determine compatibility of the destination subscriber unit with the source radio telephony subscriber unit; comparing the in-band initialization pattern sent to the source base station with local data; and sending speech information in a compatible format from the source base station to the destination base station if the initialization pattern and local data are compatible. - View Dependent Claims (16, 17, 18, 19)
-
Specification