# US 7,411,979 B2 · Enhanced SDU discard procedure for a special data segmentation in a wireless communications system

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- Number: US 7,411,979 B2
- Document ID: US7411979B2
- Status: Granted
- Kind: B2
- Application number: 11/160,684
- Filed: 2005-07-05
- Published: 2006-04-13
- Granted: 2008-08-12
- Earliest claimed: 2004-09-24
- Assignees: Innovative Sonic Limited
- Inventors: Sam Shiaw-Shiang Jiang
- Web page: https://patentgrep.com/patent/US7411979B2

## CPC

- H04L 1/187: {Details of sliding window management}
- H04L 1/1832: {Details of sliding window management}
- H04L 1/1877: {for semi-reliable protocols, e.g. for less sensitive applications like streaming video (buffer level management for video bitstream control arrangements H04N21/44004)}
- H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC
- H04W 99/00: Subject matter not provided for in other groups of this subclass
- 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)}
- H04W 80/00: Wireless network protocols or protocol adaptations to wireless operation
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method for handling discarding of a sequence of service data units in a communications system is disclosed. The sequence of service data units includes at least a last discarded service data unit (SDU). When a protocol data unit (PDU) containing a length indicator of the last discarded SDU contains no new SDUs, the method includes creating a move receiving window super field (MRW SUFI), setting a NLENGTH field of the MRW SUFI to 0, setting a last sequence number move receiving window field (SN_MRWLENGTH) to a sum of one plus a sequence number (SN) of the PDU containing the length indicator of the last discarded SDU, and issuing the MRW SUFI.

## Claims

### Claim 1

A method for handling discarding of a sequence of service data units in a communications system, the sequence of service data units comprising at least a last discarded service data unit (SDU), the method comprising the following steps:
when a protocol data unit (PDU) containing a length indicator of the last discarded SDU contains no new SDUs:
creating a move receiving window super field (MRW SUFI);
setting a NLENGTH field of the MRW SUFI to 0;
setting a last sequence number move receiving window field (SN_MRWLENGTH) to a sum of one plus a sequence number (SN) of the PDU containing the length indicator of the last discarded SDU; and
issuing the MRW SUFI;
wherein the length indicator indicates an end position of the last discarded SDU; the SN_MRWLENGTH indicates a sequence number of a PDU that contains a data segment of a SDU right after the last discarded SDU; setting the NLENGTH field of the MRW SUFI to 0 indicates that the last SDU discarded ended in a PDU with sequence number SN_MRWLENGTH-1 and that the first data octet in a PDU with sequence number SN_MRWLENGTH is the first data octet of the SDU right after the last discarded SDU; and the MRW SUFI is used to signal the information of discarded SDUs.

### Claim 2 (depends on 1)

The method of claim 1 wherein the PDU containing the length indicator of the last discarded SDU does not contain a data segment of the last discarded SDU.

### Claim 3 (depends on 1)

A communications device implementing the method of claim 1.

### Claim 4 (depends on 3)

The communications device of claim 3 further comprising a transmitter and receiver.

### Claim 5 (depends on 4)

The communications device of claim 4 being a cellular phone.

### Claim 6 (depends on 4)

The communications device of claim 4 being a cellular base station.

### Claim 7 (depends on 4)

The communications device of claim 4 being a fixed wireless networking unit.

### Claim 8 (depends on 4)

The communications device of claim 4 being a fixed wireless telephone system.

### Claim 9 (depends on 2)

A communications device implementing the method of claim 2.

### Claim 10 (depends on 9)

The communications device of claim 9 further comprising a transmitter and receiver.

### Claim 11 (depends on 10)

The communications device of claim 10 being a cellular phone.

### Claim 12 (depends on 10)

The communications device of claim 10 being a cellular base station.

### Claim 13 (depends on 10)

The communications device of claim 10 being a fixed wireless networking unit.

### Claim 14 (depends on 10)

The communications device of claim 10 being a fixed wireless telephone system.