Apparatus for transmitting/receiving data on packet data control channel in a communication system

• US 20030086385A1
• Filed: 11/07/2002
• Published: 05/08/2003
• Est. Priority Date: 11/07/2001
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Ho-Kyu, Kim, Youn-Sun, Kim, Dong-Hee, Kwon, Hwan-Joon
• Granted Patent: US 7,286,501 B2
• Time in Patent Office: Days
• US Class Current: 370/320
• CPC Class Codes: H04B 7/2637 for logical channel control
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

An apparatus and method for transmitting/receiving a PDCCH (Packet Data Control Channel) for efficient packet data transmission in a communication system supporting packet data service. To allow both TDM-transmission and TDM/CDM-transmission of packet data, PDCCHs having different control information are transmitted. A 1PDCCH and a 2PDCCH are selectively transmitted according to the channel environments of users to thereby minimize the transmission power of the 1PDCCH and the 2PDCCH. A PDCCH receiver receives the 1PDCCH and the 2PDCCH using Walsh functions assigned to them, demodulates them, and checks errors in them, thereby obtaining control information about packet data to be received.

Claims

1. A method of transmitting in a transmitting apparatus of a base station (BS) packet data control information having a variable length according to the length of packet data, the BS having an orthogonal code space within which a plurality of orthogonal codes are arranged, and transmitting packet data spread with the orthogonal codes to a single mobile station (MS), or simultaneously transmits to two or more MSs packet data spread with different orthogonal codes in the orthogonal code space, the method comprising the steps of:

transmitting on a primary packet data control channel (1PDCCH) primary packet data control information including information indicating one of at least two MSs that receive packet data and primary orthogonal code allocation information indicating a first orthogonal code of a predetermined numbered orthogonal code available to the MS in the orthogonal code space; and

transmitting on a secondary packet data control channel (2PDCCH) secondary packet data control information including information indicating the other MS, the primary orthogonal code allocation information, and secondary orthogonal code allocation information indicating orthogonal codes available to the other MS in the orthogonal code space.

2. The method of claim 1, wherein the 1PDCCH and the 2PDCCH are transmitted simultaneously.

3. The method of claim 1, wherein the MS indicating information transmitted on the 1PDCCH includes an SPID (Sub-Packet Identification), an ARQ ID (Automatic Repeat Request ID), a payload size, and a MAC ID (Medium Access Control ID).

4. The method of claim 3, wherein after error detection bits are generated using the MS indicating information and added to the primary packet data control information, the primary packet data control information excluding the MAC ID is transmitted on the 1PDCCH.

5. The method of claim 1, wherein the MS indicating information transmitted on the 2PDCCH includes an SPID, an ARQ ID, a payload size, and a MAC ID.

6. The method of claim 5, wherein after error detection bits are generated using the MS indicating information and added to the secondary packet data control information, the secondary packet data control information excluding the MAC ID is transmitted on the 2PDCCH.

7. The method of claim 1, wherein the 1PDCCH and the 2PDCCH are spread with different Walsh codes.

8. The method of claim 1, wherein the 1PDCCH is transmitted to a user in the worst channel environment among users to which packet data is transmitted.

9. An apparatus in a base station (BS) for transmitting packet data control information having a variable length according to the length of packet data, the BS having an orthogonal code space arranged with a plurality of orthogonal codes, and transmitting packet data spread with the orthogonal codes to a single mobile station (MS), or simultaneously transmits to two or more MSs packet data spread with different orthogonal codes in the orthogonal code space, the apparatus comprising:

a first transmitter for transmitting on a primary packet data control channel (1PDCCH) primary packet data control information including information indicating one of at least two MSs that receive packet data and primary orthogonal code allocation information indicating a first orthogonal code of a predetermined numbered orthogonal code available to the MS in the orthogonal code space; and

a second transmitter for transmitting on a secondary packet data control channel (2PDCCH) secondary packet data control information including information indicating the other MS, the primary orthogonal code allocation information, and secondary orthogonal code allocation information indicating orthogonal codes available to the other MS in the orthogonal code space.

10. An apparatus in a base station (BS) for transmitting packet data control information having a variable length according to the length of packet data, the BS having an orthogonal code space arranged with a plurality of orthogonal codes, and transmitting packet data spread with the orthogonal codes to a single mobile station (MS), or simultaneously transmits to two or more MSs packet data spread with different orthogonal codes in the orthogonal code space, the apparatus comprising:

an error detection bit adder for generating predetermined symbols by adding error detection bits to control information to be transmitted on each control channel corresponding to each packet data channel for simultaneous packet transmission to at least two MSs and information indicating each of the MSs;

a tail bit adder for adding tail bits in a predetermined pattern to the symbols for each error detection bit-added data;

an encoder for encoding the tail bit-added symbols at different code rates according to the number of transmission slots of the control channels;

a repeater for repeating the code symbols received from the encoder according to the number of transmission slots of the control channels;

a puncturer for puncturing the repeated symbols according to the control channels and the number of transmission slots of the control channels; and

a controller for generating the control information and the MS indicating information and controlling each device in the transmitting apparatus.

11. The apparatus of claim 10, wherein the error detection bit adder adds the error detection bits to the control information and the MS indicating information and outputs the symbols excluding the MS indicating information.

12. An apparatus in a mobile station (MS) for receiving from a base station (BS) packet data control information having a variable length according to the length of packet data, the BS having an orthogonal code space within which a plurality of orthogonal codes are arranged, and transmitting packet data spread with the orthogonal codes to a single MS, or simultaneously transmits to two or more MSs packet data spread with different orthogonal codes in the orthogonal code space in a mobile communication system, the apparatus comprising:

a reception processor for classifying packet data control information received on a packet data control channel according to whether the packet data control information is for one user or for two or more users, and processing the classified packet data control information according to the slot length of the classified packet data control information;

a user identifier (ID) generator for outputting the ID of the MS;

an error detector for checking errors in the user information using the user ID and outputting an error check result; and

a controller for determining whether packet data has been received on a packet data channel.

13. The apparatus of claim 12, wherein if the slot length of the packet data control information is 4 slots, the 4-slot packet data control information is classified according to whether the 4-slot packet data control information is about 4-slot packet data or about 8-slot packet data.

14. The apparatus of claim 13, wherein the error detector checks errors in the 4-slot packet data control information using different initial values according to whether the 4-slot packet data control information is about 4-slot packet data or about 8-slot packet data.