# US 2019/0174352 A1 · Method for processing radio protocol in mobile telecommunications system and transmitter of mobile telecommunications

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- Number: US 2019/0174352 A1
- Document ID: US20190174352A1
- Status: Published application
- Kind: A1
- Application number: 16/262,457
- Filed: 2019-01-30
- Published: 2019-06-06
- Earliest claimed: 2007-03-19
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seung-June YI; Young-Dae LEE; Sung-Duck CHUN; Sung-Jun PARK
- Web page: https://patentgrep.com/patent/US20190174352A1

## CPC

- H04W 28/065: {using assembly or disassembly of packets}
- H04L 69/04: Protocols for data compression, e.g. ROHC
- H04L 69/18: Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
- H04L 69/22: Parsing or analysis of headers
- H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC
- H04W 12/02: Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
- H04W 12/037: of the control plane, e.g. signalling traffic
- H04L 49/90: Buffering arrangements
- H04W 36/0235: {by transmitting sequence numbers, e.g. SN status transfer}
- H04W 80/02: Data link layer protocols
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An apparatus and method for performing procedures (protocols) of a PDCP (Packet Data Convergence Protocol) layer and an RLC (radio layer in an E-UMTS (Evolved Universal Mobile Telecommunications System) which has evolved from UMTS, among radio protocols of a mobile communication system. The PDCP layer performs ciphering on data (i.e., PDCP SDU) received from an upper layer, generates an indicator discriminating ciphered data and non-ciphered data (i.e., an ROHC feedback packet directly generated by the PDCP layer), and transmits the same to a lower layer (i.e., MAC layer). A PDCP SN (Sequence Number) is defined as an algorithm for ciphering the data in the PDCP layer to perform ciphering in the PDCP layer.

## Claims

### Claim 1

A transmitting device comprising:
a first sequence number (SN) related module configured to receive a packet data convergence protocol (PDCP) service data unit (SDU) from an upper entity and perform sequence numbering to the received PDCP SDU;
a header compression related module configured to compress a header of the received PDCP SDU;
a ciphering related module configured to cipher the header-compressed PDCP SDU; and
a second SN related module configured to add a first SN to the ciphered PDCP SDU;
wherein the first SN is added to the ciphered PDCP SDU based on the performed sequence numbering by the first SN related module.

### Claim 2 (depends on 1)

The transmitting device of claim 1, further comprising:
a first buffer configured to store the PDCP SDU received from the upper entity.

### Claim 3 (depends on 2)

The transmitting device of claim 2, wherein the first SN-added PDCP SDU is a radio link control (RLC) SDU.

### Claim 4 (depends on 3)

The transmitting device of claim 3, further comprising:
a second buffer configured to receive and store the RLC SDU; and
a segmentation related module configured to segment the RLC SDU.

### Claim 5 (depends on 4)

The transmitting device of claim 4, further comprising:
a third SN related module configured to add a second SN to the segmented RLC SDU.

### Claim 6 (depends on 1)

The transmitting device of claim 1, wherein the header compression related module further configured to generate data independently from the PDCP SDU received from the upper entity.

### Claim 7 (depends on 6)

The transmitting device of claim 6, wherein the data generated by the header compression related module is a robust header compression (ROCH) feedback packet.

### Claim 8

A method for processing data in a transmitting device, the method comprising:
receiving a packet data convergence protocol (PDCP) service data unit (SDU) from an upper entity;
performing sequence numbering to the received PDCP SDU;
compressing a header of the received PDCP SDU;
ciphering the header-compressed PDCP SDU; and
adding a first SN to the ciphered PDCP SDU,
wherein the first SN is added to the ciphered PDCP SDU based on the performed sequence numbering.

### Claim 9 (depends on 8)

The method of claim 8, further comprising:
storing, in a first buffer, the PDCP SDU received from the upper entity.

### Claim 10 (depends on 9)

The method of claim 9, wherein the first SN-added PDCP SDU is a radio link control (RLC) SDU.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
receiving and storing, in a second buffer, the RLC SDU; and
segmenting the RLC SDU.

### Claim 12 (depends on 11)

The method of claim 11, further comprising:
adding a second SN to the segmented RLC SDU.

### Claim 13 (depends on 8)

The method of claim 8, further comprising:
generating data independently from the PDCP SDU received from the upper entity.

### Claim 14 (depends on 13)

The method of claim 13, wherein the data generated independently from the PDCP SDU received from the upper entity, is a robust header compression (ROCH) feedback packet.