Data framing format for digital radio communications and method of forming same

• US 5,995,554 A
• Filed: 06/03/1996
• Issued: 11/30/1999
• Est. Priority Date: 06/03/1996
• Status: Expired due to Term

• Current Assignee: VTech Telecommunications Limited (VTech Holdings Ltd.)
• Original Assignee: VTech Telecommunications Limited (VTech Holdings Ltd.)
• Inventors: Lang, Ralph Uwe
• Primary Examiner(s): Ghebretinsae, Temesghen
• Application Number:
  US08/656,720
• Time in Patent Office: 1,275 Days
• Field of Search: 375/295, 375/300, 370/470, 370/471, 370/472, 370/474, 370/476, 340/825.44
• US Class Current: 375/295
• CPC Class Codes: H04L 5/22 using time-division multiplexing

Abstract

A data frame format, and method for forming a data frame for use in a wireless communication system, which includes both voice and command/control data in each frame. The data frame has two or more voice fields and two or more command fields. Each of the voice fields are equal in size and contain an equal portion of the digital audio data. The voice fields may be further arranged into two or more sub-portions arranged most significant to least significant bit and each of the sub-portions are arranged most significant to least significant bit. The voice fields may further include a check field contiguous to one of the two or more sub-portions to provide the ability to determine whether a selected portion of each of the sub-portions is erroneous. Each of the command fields contain an equal portion of the digital command data. Each of the two or more command fields are interleaved between the two or more voice fields and contiguous to at least one of the two or more voice fields in the data frame. The data frame may also include a frame synchronization field.

Claims

1. A method of forming a data frame for use in a radio system that continuously transmits both digital audio data and digital command data between stations in the radio system via a plurality of said data frames, said data frame having a beginning and an end, said method comprising the steps of:

dividing a single stream of the digital audio data into two or more audio fields;

splitting a stream of the digital command data into two or more command fields;

interleaving the two or more audio fields with the two or more command fields evenly;

determining an associated check field value for each of the two or more audio fields; and

appending to each of the two or more audio fields the associated check field.

2. A method of forming a data frame for use in a radio system that continuously transmits both digital audio data and digital command data between stations in the radio system, said data frame having a beginning and an end, said method comprising the steps of:

dividing a single stream of the digital audio data into two or more audio fields

determining a check field value for each of the two or more audio fields

forming two or more voice fields from the two or more audio fields and the check field value;

splitting a stream of the digital command data into two or more command fields of substantially shorter length than each of the two or more audio fields;

interleaving the two or more voice fields with the two or more command fields evenly; and

appending a synchronization field that is shorter length than each of the two or more voice fields.

3. A method of forming a data frame for use in a radio system that continuously transmits both digital audio data and digital command data between stations in the radio system via a plurality of said data frames, said data frame having a beginning and an end, said method comprising the steps of:

dividing a single stream of the digital audio data into two or more audio fields;

arranging each of said two or more audio fields into two or more sub-portions placed most significant to least significant within each of the two or more audio fields;

splitting a stream of the digital command data into two or more command fields;

interleaving the two or more audio fields with the two or more command fields evenly.

4. The method according to claim 3 wherein the step of arranging further includes the sub-step of ordering the bits within each of the two or more sub-portions most significant to least significant.

5. A method of forming a data frame for use in a radio system that continuously transmits both digital audio data and digital command data between stations in the radio system via a plurality of said data frames, said data frame having a beginning and an end, said method comprising the steps of:

dividing a single stream of the digital audio data into two or more audio fields;

arranging each of said two or more audio fields into two or more sub-portions in which the bits within each subportion are ordered most significant to least significant;

splitting a stream of the digital command data into two or more command fields;

interleaving the two or more audio fields with the two or more command fields evenly.

6. A method of forming a data frame for use in a radio system that continuously transmits both digital audio data and digital command data between stations in the radio system via a plurality of said data frames, said data frame having a beginning and an end, said method comprising the steps of:

creating a single continuous stream of digital audio data by inserting zeroes into the stream of digital audio data where no data is available;

dividing the single stream of digital audio data into two or more audio fields;

splitting a stream of the digital command data into two or more command fields;

interleaving the two or more audio fields with the two or more command fields evenly.