Method and apparatus for handling control PDUS during re-establishing receiving sides in a wireless communications system

• US 20070064600A1
• Filed: 09/21/2006
• Published: 03/22/2007
• Est. Priority Date: 09/21/2005
• Status: Active Grant

• Current Assignee: L2 Mobile Technologies LLC (Tanit Ventures Inc.)
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: Jiang, Sam
• Granted Patent: US 8,054,777 B2
• Time in Patent Office: Days
• US Class Current: 370/229
• CPC Class Codes: H04L 1/187 Details of sliding window management
• CPC Class Codes: H04L 1/1883 using multiple timers
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 76/38 triggered by timers
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

A wireless communications system has a communications device, which has an RLC entity having a transmitting side and a receiving side. When re-establishing the receiving side, to handle control PDUs, only the receiving side in the RLC entity of the communications device is re-established, a first control PDU corresponding to the receiving side is discarded, and a second control PDU corresponding to the transmitting side is retained and not discarded.

Claims

1. A method of handling control PDUs in a wireless communications system having a communications device having an RLC entity having a transmitting side and a receiving side when reestablishing the receiving side comprising:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side.

3. The method of claim 1 with a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the first control PDU corresponding to the receiving side is an ACK/NACK Status PDU.

4. The method of claim 1 with a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the first control PDU corresponding to the receiving side is a Change Window Size Status PDU.

5. The method of claim 1 with a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the first control PDU corresponding to the receiving side is an MRW ACK Status PDU.

6. The method of claim 1 with a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the first control PDU corresponding to the receiving side is a RESET ACK PDU.

7. The method of claim 1 with a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the first control PDU corresponding to the receiving side is an MRW PDU.

8. The method of claim 1 having a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the first control PDU corresponding to the receiving side is a RESET PDU.

9. The method of claim 1 having a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the wireless communications system operates in Acknowledged Mode.

10. The method of claim 1 having a communications device having a control circuit for realizing functions of the communications device, a central processing unit for executing a program code to operate the control circuit, and a memory for storing the program code, the program code comprises:

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side,

wherein the communications device is a mobile phone, a wireless mobile communications device, or a networking device.

2. A communications device utilized in a wireless communications system, an RLC entity of the communications device having a transmitting side and a receiving side, utilized for accurately reestablishing the receiving side, the communications device comprising:

a control circuit for realizing functions of the communications device;

a central processing unit for executing a program code to operate the control circuit; and

a memory for storing the program code;

wherein the program code comprises;

only reestablishing the receiving side in the RLC entity of the communications device;

discarding a first control PDU corresponding to the receiving side; and

retaining and not discarding a second control PDU corresponding to the transmitting side.