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US-12628236-B2 - Method and apparatus for supporting RLC UM mode operation in next generation mobile communication system

US12628236B2US 12628236 B2US12628236 B2US 12628236B2US-12628236-B2

Abstract

The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as a smart home, a smart building, a smart city, a smart car, a connected car, health care, digital education, a smart retail, security and safety services.

Inventors

  • Donggun Kim
  • Soenghun KIM
  • Sangbum Kim

Assignees

  • SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date
20260512
Application Date
20231023
Priority Date
20170609

Claims (10)

  1. 1 . A method performed by an apparatus in a wireless communication system, the method comprising: receiving, from a lower layer, a radio link control (RLC) unacknowledged mode (UM) protocol data unit (PDU); identifying whether an RLC header of the RLC UM PDU contains a sequence number (SN); in case that the RLC header of the RLC UM PDU does not contain the SN, removing the RLC header of the RLC UM PDU and delivering, to a higher layer, a first RLC UM service data unit (SDU), wherein the first RLC UM SDU is obtained by removing the RLC header of the RLC UM PDU; and in case that the RLC header of the RLC UM PDU contains the SN, storing the RLC UM PDU in a reception buffer, reassembling second RLC UM SDU based on at least two RLC UM PDUs, removing the RLC header, and delivering, to the higher layer, the reassembled second RLC UM SDU, wherein the RLC UM PDU of which the RLC header contains the SN comprises a segment of the second RLC UM SDU.
  2. 2 . The method of claim 1 , wherein the RLC header of the RLC UM PDU contains a segmentation information (SI) field, wherein the RLC UM PDU is a complete RLC UM SDU, in case that the SI field is 00, and wherein the RLC UM PDU is a first segment of an RLC UM SDU, in case that the SI field is 01.
  3. 3 . The method of claim 2 , wherein the RLC header of the RLC UM PDU does not contain a segmentation offset (SO) field, in case that the SI field is 00 or 01.
  4. 4 . The method of claim 1 , further comprising: identifying whether the SN is lower than a value of a window, in case that the RLC header of the RLC UM PDU contains the SN, and discarding the RLC UM PDU in case that the SN is lower than the value of the window.
  5. 5 . The method of claim 1 , further comprising: in case that the RLC header of the RLC UM PDU contains the SN, identifying whether a timer is running; starting the timer, in case that the timer is not running; identifying a loss of a segment of the second RLC UM SDU associated with the SN when the timer is expired; and discarding the stored RLC UM PDU in the reception buffer in case that the loss of the segment of the second RLC UM SDU associated with the SN is identified.
  6. 6 . An apparatus in a wireless communication system, the apparatus comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: receive, from a lower layer, a radio link control (RLC) unacknowledged mode (UM) protocol data unit (PDU), identify whether am RLC header of the RLC UM PDU contains a sequence number (SN), in case that the RLC header of the RLC UM PDU does not contain the SN, remove the RLC header of the RLC UM PDU and deliver, to a higher layer, a first RLC UM service data unit (SDU), wherein the first RLC UM SDU is obtained by removing the RLC header of the RLC UM PDU, and in case that the RLC header of the RLC UM PDU contains the SN, store the RLC UM PDU in a reception buffer, reassemble second RLC UM SDU based on at least two RLC UM PDUs, remove the RLC header, and deliver, to the higher layer, the reassembled second RLC UM SDU, wherein the RLC UM PDU of which the RLC header contains the SN comprises a segment of the second RLC UM SDU.
  7. 7 . The apparatus of claim 6 , wherein the RLC header of the RLC UM PDU contains a segmentation information (SI) field; wherein the RLC UM PDU is a complete RLC UM SDU, in case that the SI field is 00; and wherein the RLC UM PDU is a first segment of a RLC UM SDU, in case that the SI field is 01.
  8. 8 . The apparatus of claim 7 , wherein the RLC header of the RLC UM PDU does not contain a segmentation offset (SO) field, in case that the SI field is 00 or 01.
  9. 9 . The apparatus of claim 6 , wherein the at least one processor is further configured to: identify whether the SN is lower than a value of a window, in case that the RLC header of the RLC UM PDU contains the SN, and discard the RLC UM PDU in case that the SN is lower than the value of the window.
  10. 10 . The apparatus of claim 6 , wherein the at least one processor is further configured to: in case that the RLC header of the RLC UM PDU contains the SN, identify whether a timer is running, start the timer, in case that the timer is not running, identify a loss of a segment of the second RLC UM SDU associated with the SN when the timer is expired, and discard the stored RLC UM PDU in the reception buffer in case that the loss of the segment of the second RLC UM SDU associated with the SN is identified.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application a continuation application of prior application Ser. No. 17/665,072 filed on Apr. 4, 2022, which has issued as U.S. Pat. No. 11,800,592 on Oct. 24, 2023; which is a divisional application of prior application Ser. No. 17/150,589 filed on Jan. 15, 2021, which has issued as U.S. Pat. No. 11,751,272 on Sep. 5, 2023; which is a continuation application of prior application Ser. No. 16/825,223 filed on Mar. 20, 2020, which has issued a U.S. Pat. No. 11,265,952 on Mar. 1, 2022; which is a continuation application of prior application Ser. No. 16/003,743 filed on Jun. 8, 2018, which has issued as U.S. Pat. No. 10,602,563 on Mar. 24, 2020; and which is based on and claims priority under 35 U.S.C § 119(a) of a Korean patent application number 10-2017-0072581 filed on Jun. 9, 2017 in the Korean Intellectual Property Office, and of a Korean patent application number 10-2017-0079480 filed on Jun. 23, 2017 in the Korean Intellectual Property Office, the disclosure of each of which is incorporated by reference herein in its entirety. BACKGROUND 1. Field The disclosure proposes a method and an apparatus for supporting a radio link control (RLC) unacknowledged mode (UM mode) operation in a next generation mobile communication system. More particularly, the disclosure relates to an apparatus and method for a new RLC UM mode operation capable of reducing overhead and the unnecessary processing of a user equipment (UE) in a next generation mobile communication system. 2. Description of Related Art To meet the demand for wireless data traffic having increased since deployment of fourth generation (4G) communication systems, efforts have been made to develop an improved fifth generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post long term evolution (LTE) System’. The 5G communication system is considered to be implemented in higher frequency millimeter wave (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancellation and the like. In the 5G system, Hybrid FSK and quadrature amplitude modulation (QAM) modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed. The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The internet of everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as “sensing technology”, “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology” have been demanded for IoT implementation, a sensor network, a machine-to-machine (M2M) communication, machine type communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing information technology (IT) and various industrial applications. The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. SUMMARY Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide an apparatus and method for a new radio link control (RLC) unacknowledged mode (UM mode) operation capable of reducing ove