Device and method for exchanging frame messages of different lengths in CDMA communication system

• US 20040136344A1
• Filed: 12/02/2003
• Published: 07/15/2004
• Est. Priority Date: 03/14/1998
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ahn, Jae-Mim, Park, Jin-Soo, Yoon, Soon-Young, Kang, Hee-Won, Kim, Jae-Yoel, Kim, Young-Ky, Lee, Hyun-Suk
• Granted Patent: US 8,249,040 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/0048 Walsh

Abstract

In a transmission device and method for a CDMA communication system, when a shorter frame message is generated during transmission of a longer frame message, the transmission of the longer frame message is interrupted, whereupon the shorter frame message is immediately transmitted in place of a portion of the longer frame message. In one embodiment, after the longer frame message is interrupted and the shorter frame message is transmitted, only the tail portion of the longer frame message is transmitted thereafter. That is, the replaced portion of the longer frame message is not transmitted following the shorter frame message transmission. In an alternative embodiment, following the shorter frame message transmission, the remainder of the longer frame message, from the point of interruption, is transmitted in its entirety. In the latter case, the longer frame message is delayed by the length of the shorter frame message.

Claims

1. A transmission device for a wireless communication system, comprising:

a first message generator for encoding first input data of a first bit stream to generate a first frame message having a first frame length;

a second message generator for encoding second input data of a second bit stream longer than the first bit stream to generate a second frame message having a second frame length longer than the first frame length;

a multiplexer for replacing a portion of the second frame message with the first frame message; and

a spreader for spreading an output of the multiplexer.

2. The transmission device as claimed in claim 1, wherein the first frame message and the second frame message are multiplexed when the first frame message is generated during transmission of the second frame message.

3. The transmission device as claimed in claim 1, wherein the multiplexer intermixingly outputs, in sequence, a portion of the second frame message, the replaced first frame message and a remaining portion of the second frame message.

4. The transmission device as claimed in claim 1, wherein the multiplexer intermixingly outputs, in sequence, the replaced first frame message and the second frame message from which a portion corresponding to the first frame message is deleted.

5. The transmission device as claimed in claim 3, further comprising a power controller for increasing a transmission power of the remaining portion of the second frame message, following the replaced first frame message, to be higher than that of the first frame message.

6. The transmission device as claimed in claim 1, wherein the first frame message has a frame length of 5 ms and the second frame message has a frame length of 20 ms.

7. The transmission device as claimed in claim 1, wherein the second frame message generator comprises:

a cyclic redundancy check (CRC) generator for generating CRC bits according to the second input data of the second frame length;

a tail bit generator for generating tail bits and adding the generated tail bits to an output of the CRC generator;

a channel encoder for encoding the tail bit-added second frame data at a predefined coding rate; and

an interleaver for interleaving the encoded frame message by the second frame length.

8. The transmission device as claimed in claim 7, wherein the interleaver uniformly distribute symbols generated by encoding one data bit over the respective durations of the whole frame.

9. The transmission device as claimed in claim 8, wherein the interleaver is designed according to a delete matrix given by

10. The transmission device as claimed in claim 1, wherein the spreader comprises:

an orthogonal code spreader for spreading the frame message output from the multiplexer with an orthogonal code for a dedicated control channel; and

a pseudo-random noise (PN) spreader for spreading an output of the orthogonal code spreader with a PN sequence.

28. The transmission device as claimed in claim 4, further comprising a power controller for increasing a transmission power of the remaining portion of the second frame message, following the replaced first frame message, to be higher than that of the first frame message.

11. A data transmission method in a wireless communication system, comprising the steps of:

encoding first input data of a first bit stream to generate a first frame message having a first frame length;

encoding second input data of a second bit stream longer than said first bit stream to generate a second frame message having a second frame length longer than said first frame length;

replacing a portion of the second frame message with the first frame message; and

transmitting the first frame message in place of the replaced portion of the second frame message.

12. The data transmission method as claimed in claim 11, wherein the first frame message and the second frame message are multiplexed when the first frame message is generated during transmission of the second frame message.

13. The data transmission method as claimed in claim 11, wherein a portion of the second frame message, the first frame message and a remaining portion of the second frame message are intermixingly output in sequence, in said replacing step.

14. The data transmission method as claimed in claim 11, wherein the first frame message and the second frame message from which a portion corresponding to the first frame message is deleted, are intermixingly output in sequence, in said replacing step.

15. The data transmission method as claimed in claim 13, further comprising the step of increasing a transmission power of the remaining portion of the second frame message, following the first frame message, to be higher than that of the first frame message.

16. The data transmission method as claimed in claim 11, wherein the first frame message has a frame length of 5 ms and the second frame message has a frame length of 20 ms.

17. The data transmission method as claimed in claim 16, wherein a portion of the second frame message is deleted to insert the first frame message into the deleted portion for a second duration, and the remaining portion of the second frame message is output for third and fourth durations, in said replacing step.

18. The data transmission method as claimed in claim 17, wherein a portion of the second frame message is deleted to insert the first frame message in the deleted portion for a first duration, and the remaining portion of the second frame message is output for second, third and fourth durations, in said replacing step.

19. The data transmission method as claimed in claim 17, further comprising the step of increasing the transmission power of the remaining portion of the second frame message, following the inserted first frame message.

20. The data transmission method as claimed in claim 11, wherein the second frame message generation step comprises the steps of:

generating CRC bits according to second data input of the second frame length;

generating tail bits and adding the generated tail bits to the CRC bit-added second data;

encoding the tail bit-added second frame data at a predefined coding rate; and

interleaving symbols of the encoded second frame data by the second frame length.

21. The data transmission method as claimed in claim 20, wherein symbols generated by encoding one data bit are uniformly distributed over the respective durations of the whole frame, in said interleaving step.

22. The data transmission method as claimed in claim 21, wherein the symbols are distributed according to a delete matrix given by

23. The data transmission method as claimed in claim 11, wherein the transmission step comprises the steps of:

spreading the frame message with an orthogonal code; and

spreading an orthogonal spread signal with a PN sequence.

29. The data transmission method as claimed in claim 14, further comprising the step of increasing a transmission power of the remaining portion of the second frame message, following the first frame message, to be higher than that of the first frame message.

30. The data transmission method as claimed in claim 18, further comprising the step of increasing the transmission power of the remaining portion of the second frame message, following the inserted first frame message.

24. A receiving device for a wireless communication system comprising:

a transmission device including;

a despreader for despreading a received signal;

a first message receiver for deinterleaving the despread signal by the first frame length and decoding the deinterleaved signal to generate a first frame message; and

a second message receiver for deinterleaving the despread signal by the second frame length and decoding the deinterleaved signal to generate a second frame message.

25. The wireless communication system as claimed in claim 24, wherein the multiplexer multiplexes the first frame message and the second frame message when the first frame message is generated during transmission of the second frame message.

26. A data receiving method in a spread spectrum communication system, comprising the steps of:

deinterleaving the despread signal by the first frame length and decoding the deinterleaved signal to generate a first frame message; and

deinterleaving the despread signal by the second frame length and decoding the deinterleaved signal to generate a second frame message.

27. The data exchanging method as claimed in claim 26, wherein the first frame message and the second frame message are multiplexed when the first frame message is generated during transmission of the second frame message.