APPARATUS AND METHOD FOR COMMUNICATING PACKET DATA CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM

• US 20080043683A1
• Filed: 10/24/2007
• Published: 02/21/2008
• Est. Priority Date: 03/10/2001
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Young-Kwon, Kim, Youn-Sun, Kwon, Hwan-Joon, Hong, Woo-Sang, Bae, Chang-Hun, Choi, Ho-Kyu, Jang, Jae-Sung
• Granted Patent: US 7,593,451 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 2001/70935 using a bank of matched fileters, e.g. Fast Hadamard Transform
• CPC Class Codes: H04B 7/2637 for logical channel control
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes

Abstract

A base station transmission apparatus for transmitting MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive transmission packet data and length information of the transmission packet data in a mobile communication system for high-speed packet transmission, having an encoder for encoding a bit stream indicating the MAC ID information and generating coded symbols; a Walsh cover section for Walsh-covering the coded symbols from the encoder with a Walsh code based on the length information; and a Walsh spreader for spreading the Walsh-covered symbols from the Walsh cover section with a predetermined Walsh code.

Claims

1. A terminal reception apparatus for receiving MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive packet data transmitted by a base station and length information of the packet data in a mobile communication system for high-speed packet transmission, comprising:

a despreader for extracting symbols of a packet data control channel over which the MAC ID information and the length information are transmitted, by despreading a received signal with a Walsh code;

an energy detector for measuring energy of symbols output from the despreader and generating a packet data control detection signal when the measured energy value is greater than a threshold;

a length information generator operable in response to the packet data control detection signal, for extracting a Walsh code having a peak value by performing inverse fast Hadamard transform on the symbols from the despreader using a determined Walsh code based on the length information, and generating the length information according to the extracted Walsh code;

a Walsh decover section for Walsh-decovering the symbols from the despreader with the extracted Walsh code; and

a decoder for generating the MAC ID information by decoding symbols from the Walsh decover section.

2. The terminal reception apparatus as claimed in claim 1, further comprising a demodulator connected between the Walsh decover section and the decoder, for demodulating the symbols form the Walsh decover section and outputting the demodulated symbols to the decoder.

3. The terminal reception apparatus as claimed in claim 1, further comprising a demodulator connected between the despreader and the length information generator, for demodulating the symbols from the despreader and outputting the demodulated symbols to the length information generator.

4. A terminal reception method in a mobile communication system for high-speed packet transmission, comprising the steps of:

despreading a signal of a packet data control channel for receiving MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive packet data and receiving length information of the packet data, using a predetermined Walsh code, and generating symbols;

measuring energy of the generated symbols, and generating a packet data control detection signal when the measured energy value is greater than a threshold;

extracting a Walsh code having a peak value by performing inverse fast Hadamard transform on the generated symbols using a Walsh code based on the length information in response to the packet data control detection signal, and generating the length information according to the extracted Walsh code;

Walsh-decovering the generated symbols with the extracted Walsh code; and

generating the MAC ID information by decoding the Walsh-decovered symbols.

5. The terminal reception method as claimed in claim 4, further comprising the steps of:

comparing the generated MAC ID information with MAC ID information assigned from a base station;

acquiring remaining control information by demodulating and decoding a signal of a channel for receiving remaining packet data control information excepting the MAC ID information and the length information, when the generated MAC ID information is identical to MAC ID information assigned from a base station; and

demodulating and decoding a signal of a channel for receiving the packet data using the length information and the control information.

6. A terminal reception method in a mobile communication system for high-speed packet transmission, comprising the steps of:

despreading signals received through an I channel and a Q channel with a Walsh code based on previously assigned MAC (Medium Access Control) ID (Identification) information, and generating symbols;

selecting symbols on the I channel or symbols on the Q channel according to the MAC ID information;

measuring energy of the selected symbols and generating a packet data control detection signal when the measured energy value is greater than a threshold; and

generating length information of the packet data by decoding the symbols depending on the packet data control detection signal when the packet data is inputted to the terminal.

7. The terminal reception method as claimed in claim 6, further comprising the steps of:

after generating the length information, demodulating and decoding a signal of a channel for receiving remaining control information excepting the length information to thereby acquire the remaining packet data control information; and

demodulating and decoding a signal of a channel for receiving packet data depending on the length information and the packet data control information.

8. The terminal reception method as claimed in claim 7, wherein the control information includes subpacket ID information, ARQ (Automatic Repeat Request) channel ID information and payload size information.

9. The terminal reception method as claimed in claim 6, further comprising the steps of:

after generating the length information, demodulating and decoding a signal of a channel for receiving remaining packet data control information excepting the length information to thereby acquire the remaining control information;

acquiring MAC ID information from the control information;

comparing the acquired MAC ID information with MAC ID information previously assigned from a base station; and

demodulating and decoding a signal of a channel for receiving packet data depending on the length information and the control information, when the acquired MAC ID information is identical to the previously assigned MAC ID information.

10. The terminal reception method as claimed in claim 9, wherein the control information includes MAC ID information, subpacket ID information, ARQ channel ID information and payload size information.

11. The terminal reception method as claimed in claim 6, wherein the symbols are decoded by block decoding.