Data transmission method, data transmission system, and cellular radio system

• US 6,092,222 A
• Filed: 08/13/1996
• Issued: 07/18/2000
• Est. Priority Date: 12/19/1994
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Wang, Ling, Jolma, Petri
• Primary Examiner(s): Grant, William
• Assistant Examiner(s): Marc, McDieunel, Marc, McDieunel
• Application Number:
  US08/693,134
• Time in Patent Office: 1,435 Days
• Field of Search: 370/100.1, 370/60.1, 370/85.2, 370/208, 370/350, 370/314, 370/311, 370/332, 370/333, 370/347, 340/825.44, 375/281, 375/260, 375/308, 704/200, 704/201, 704/278, 704/500, 704/504, 714/749, 714/752, 714/786
• US Class Current: 714/786
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 72/00 Local resource management

Abstract

A data transmission method in a system employing information channels having at least two different capacities, on which channels speech is transmitted by at least two different coding techniques in such a manner that on a channel having a higher capacity, fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity, includes speech coding, channel coding, dividing the speech signal block, combining parts, adding error correction symbols, adding rail symbols, and convolution coding. It is also possible that the convolution-coded symbols are transmitted as interleaved or that the channel-coded signal is transmitted over the full rate channel. As a result of this method, the cell size of a radio telephone system and thus, the coverage area of the system, is extended without large changes in equipment or without an increase in transmission power.

Claims

1. A data transmission method in a system employing information channels having at least two different capacities, on which channels speech is transmitted by at least two different coding techniques in such a manner that on a channel having a higher capacity, fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity, the method comprising:

speech coding a signal transmitted on at least one channel having a lower capacity according to a channel of a higher capacity;

performing channel coding on the speech coded data in such a manner that the obtained number of symbols corresponds to the channel of the lower capacity;

dividing the speech signal block into three parts which comprise 73, 22 and 17 symbols, respectively;

adding three error correction symbols to the 22-symbol part;

combining the first two parts and adding five know tail symbols thereto;

convolution coding the 103 symbols obtained in this manner with and an efficiency ratio of 1/4;

adding five known tail symbols to the posterior 17-symbol part; and

convolution coding the 22 symbols obtained in this manner with an efficiency ratio of 1/2,

wherein the speech coded data is a data block of 112 symbols.

2. A data transmission method in a system employing information channels having at least two different capacities, on which channels speech is transmitted by at least two different coding techniques in such a manner that on a channel having a higher capacity, fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity, the method comprising:

speech coding a signal transmitted on at least one channel having a lower capacity according to a channel of a higher capacity;

performing channel coding on the speech coded data in such a manner that the obtained number of symbols corresponds to the channel of the lower capacity;

dividing the speech signal block into three parts which comprise 73, 22 and 17 symbols, respectively;

adding three error correction symbols to the 22-symbol part;

combining the first two parts and adding five know tail symbols thereto;

convolution coding the 103 symbols obtained in this manner with and an efficiency ratio of 1/4;

adding five known tail symbols to the posterior 17-symbol part;

convolution coding the 22 symbols obtained in this manner with an efficiency ratio of 1/2; and

transmitting the convolution coded symbols as interleaved during eight time slots,

wherein the speech coded data is a data block of 112 symbols.

3. A method for transmitting a speech signal in a system having capacity to transmit the speech signal via information channels of one of a full rate channel and a half rate channel using coders designed for the full rate channel and the half rate channel, respectively, the method comprising:

speech coding the speech signal using the coders designed for the half rate channel;

channel coding the speech coded signal for transmission over the full rate channel;

transmitting the channel coded signal over the full rate channel;

dividing the speech signal block into three parts which comprise 73, 22, and 17 symbols, respectively,

adding three error correction symbols to the 22-symbol part,

combining the first two parts and adding five known tail symbols thereto,

convolution coding the 103 symbols obtained in this manner with an efficiency ratio of 1/4,

adding five known tail symbols to the posterior 17-symbol part, and

convolution coding the 22 symbols obtained in this manner with an efficiency ratio of 1/2,

wherein the speech coded data is a data block of 112 symbols.