METHOD FOR TRANSMITTING STATUS REPORT OF PDCP LAYER IN MOBILE TELECOMMUNICATIONS SYSTEM AND RECEIVER OF MOBILE TELECOMMUNICATIONS

• US 20180192308A1
• Filed: 02/28/2018
• Published: 07/05/2018
• Est. Priority Date: 09/11/2007
• Status: Active Grant

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Granted Patent: US 10,306,489 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 69/321 Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
• CPC Class Codes: H04L 69/322 Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

A status report transmission of the PDCP layer for a PDCP status report can reduce radio resources by transmitting the reception success or failure of a series of PDCP service data units (SDUs) in the form of a bitmap when configuring the PDCP status report for reporting a reception status of PDCP SDUs to another party in the PDCP layer. A PDCP control packet data unit (PDU) is generated to communicate a status report for one or more PDCP SDUs transmitted from a transmitting node. The PDCP control PDU includes a data/control (D/C) bit field to indicate the PDCP control PDU is a control PDU, a control PDU type field to indicate a type of corresponding control information, a sequence number field to indicate a first missing PDCP SDU, and a bitmap field for a variable length bitmap. A specific bit in the variable length bitmap indicates whether a corresponding one of the one or more PDCP SDUs has been successfully been received. The PDCP control PDU is transmitted to the transmitting node.

Claims

1. Apparatus, comprising:

at least one processor;

at least one memory including computer program code, the memory and the computer program code configured to, working with the at least one processor, cause the apparatus to perform at least the following;

generate a packet data convergence protocol (PDCP) control packet data unit (PDU) to communicate a status report over a PDCP mobile communications protocol layer for one or more PDCP service data units (SDUs) received from a transmitting node,

wherein the PDCP control PDU includes a data/control (D/C) bit field to indicate the PDCP control PDU is a control PDU, a control PDU type field to indicate a type of corresponding control information, a sequence number field to indicate a first missing PDCP SDU, and a bitmap field for a variable length bitmap,

wherein a specific bit in the variable length bitmap indicates whether a corresponding one of the one or more PDCP SDUs has been successfully been received, and

a transmitter to transmit the PDCP control PDU to the transmitting node.

2. The apparatus of claim 1, wherein the PDCP control type field indicates a PDCP status report.

3. The apparatus of claim 1, wherein the specific bit in the variable length bitmap is configured with a single bit.

4. The apparatus of claim 3, wherein the single bit is set to 0 or 1 for indicating whether the corresponding one of the PDCP SDUs has successfully been received.

5. The apparatus of claim 4, wherein the single bit is set to 0 when the corresponding one of the one or more PDCP SDUs has not been successfully been received.

6. The apparatus of claim 4, wherein the single bit is set to 1 when the corresponding one of the one or more PDCP SDUs does not need to be retransmitted.

7. The apparatus of claim 1, wherein a length of the bitmap field can be 0.

8. The apparatus of claim 1, wherein the sequence number field corresponds to a first bit of the bitmap field or a last bit of the bitmap field.

9. A method for transmitting in a packet data convergence protocol (PDCP) layer of a mobile communication system a status report for PDCP service data units (SDUs), the method comprising:

generating a PDCP control packet data unit (PDU) to communicate a status report for one or more PDCP SDUs transmitted from a transmitting node,

wherein the PDCP control PDU includes a data/control (D/C) bit field to indicate the PDCP control PDU is a control PDU, a control PDU type field to indicate a type of corresponding control information, a sequence number field to indicate a first missing PDCP SDU, and a bitmap field for a variable length bitmap, and

wherein a specific bit in the variable length bitmap indicates whether a corresponding one of the one or more PDCP SDUs has been successfully been received, and

transmitting the PDCP control PDU to the transmitting node.

10. The method of claim 9, wherein the PDCP control type field indicates a PDCP status report.

11. The method of claim 9, wherein the specific bit in the variable length bitmap is configured with a single bit.

12. The method of claim 11, wherein the single bit is set to 0 or 1 for indicating whether or not the corresponding one of the PDCP SDUs has successfully been received.

13. The method of claim 12, wherein the single bit is set to 0 when the corresponding one of the PDCP SDUs has not been successfully been received.

14. The method of claim 12, wherein the single bit is set to 1 when the corresponding one of the PDCP SDUs does not need to be retransmitted.

15. The method of claim 9, wherein a length of the bitmap field can be 0.

16. The method of claim 9, wherein the sequence number field corresponds to a first bit of the bitmap field or a last bit of the bitmap field.