Subsequent frame variable data rate indication method
First Claim
1. A method of communicating synchronous fixed boundary frames of variable rate data from a transmitter to a receiver, the method including steps of:
- generating, at the transmitter, a first frame of data at a first frame data rate and a second frame of data at a second frame data rate subsequent to said first frame of data, wherein the first frame of data includes a second frame data rate indicator which indicates the second frame data ratewherein the generating step includes a step of encoding, at the first frame data rate, the first frame data and the second frame data rate indicator;
transmitting, from the transmitter, the first frame of data;
receiving, at the receiver, the first frame of data; and
analyzing, at the receiver, the first frame of data to determine the second frame data rate from the second frame data rate indicator.
4 Assignments
0 Petitions
Accused Products
Abstract
In a synchronous fixed frame boundary system with variable data rates, a transmitter inserts into a current frame an indication of the data rate of the next frame. After the first frame is received and processed at a receiver, the data rates of subsequent frames are known before processing, thereby reducing processing load. Furthermore, because the rate indication is inserted into the frame to be error protected along with the rest of the frame information, reliability is high, while additional data overhead and complexity are very low. As an example, North American code division multiple access digital cellular telephone systems utilize variable data rate transmissions. As a station modem (SM) assembles a current frame for convolutional encoding and further processing, the SM inserts a rate indication for the subsequent frame in accordance with information from a vocoder and CPU of the appropriate data rate for the subsequent frame. On the receiving end, rather than needing to decode multiple times to determine the appropriate data rate for every frame, the receiving SM discovers the rate of each frame subsequent to the first frame by analyzing the information contained in the immediately preceding frame. The rate determination process also includes a verification method based upon a frame quality indicator analysis and a symbol error rate analysis to ensure accurate data rate determination.
165 Citations
33 Claims
-
1. A method of communicating synchronous fixed boundary frames of variable rate data from a transmitter to a receiver, the method including steps of:
-
generating, at the transmitter, a first frame of data at a first frame data rate and a second frame of data at a second frame data rate subsequent to said first frame of data, wherein the first frame of data includes a second frame data rate indicator which indicates the second frame data rate wherein the generating step includes a step of encoding, at the first frame data rate, the first frame data and the second frame data rate indicator; transmitting, from the transmitter, the first frame of data; receiving, at the receiver, the first frame of data; and analyzing, at the receiver, the first frame of data to determine the second frame data rate from the second frame data rate indicator. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of forming fixed boundary data frames for transmission in a synchronous system, the data frames including data at variable data rates, the method including steps of:
-
generating a first frame of data including data at a first frame data rate; and generating a second frame of data subsequent to the first frame of data including data at a second frame data rate, wherein the step of generating the first frame of data includes steps of including in the first frame of data a second frame data rate indicator and encoding, at the first frame data rate, the first frame data and the second frame data rate indicator. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method of receiving fixed boundary data frames in a synchronous system, the data frames including data at variable data rates, the method including steps of:
-
receiving a first frame of data containing a second frame data rate indicator representing a second frame data rate; analyzing the first frame of data to detect the second frame data rate indicator; determining the second frame data rate from the second frame data rate indicator; receiving the second frame of data; and processing the second frame of data at the second frame data rate. - View Dependent Claims (21, 22, 23, 24, 25, 26)
-
-
27. In a transceiver apparatus for transmitting and receiving synchronous fixed boundary data frames including data at variable rates, the improvement thereto comprising:
-
means for generating frames of data wherein each frame of data including a subsequent frame data rate indicator is encoded at one of various data rates; and means for analyzing received frames of data to determine subsequent frame data rates. - View Dependent Claims (28, 29, 30, 31, 32, 33)
-
Specification