Showing papers by "Stefan Parkvall published in 2018"
Posted Content•
TL;DR: An overview of the essentials of the state of the art in 5G wireless technology represented by the 3GPP NR technical specifications is provided, with a focus on the physical layer.
Abstract: The 5th generation (5G) wireless access technology, known as new radio (NR), will address a variety of usage scenarios from enhanced mobile broadband to ultra-reliable low-latency communications to massive machine type communications. Key technology features include ultra-lean transmission, support for low latency, advanced antenna technologies, and spectrum flexibility including operation in high frequency bands and inter-working between high and low frequency bands. This article provides an overview of the essentials of the state of the art in 5G wireless technology represented by the 3GPP NR technical specifications, with a focus on the physical layer. We describe the fundamental concepts of 5G NR, explain in detail the design of physical channels and reference signals, and share the various design rationales influencing standardization.
350 citations
Book•
09 Aug 2018
TL;DR: In this paper, a detailed description of the NR physical-layer structure and higher-layer protocols, RF and spectrum aspects and co-existence and interworking with LTE is provided.
Abstract: 5G NR: The Next Generation Wireless Access Technology follows the authors' highly celebrated books on 3G and 4G by providing a new level of insight into 5G NR. After an initial discussion of the background to 5G, including requirements, spectrum aspects and the standardization timeline, all technology features of the first phase of NR are described in detail. Included is a detailed description of the NR physical-layer structure and higher-layer protocols, RF and spectrum aspects and co-existence and interworking with LTE. The book provides a good understanding of NR and the different NR technology components, giving insight into why a certain solution was selected. Content includes: Key radio-related requirements of NR, design principles, technical featuresDetails of basic NR transmission structure, showing where it has been inherited from LTE and where it deviates from it, and the reasons whyNR Multi-antenna transmission functionalityDetailed description of the signals and functionality of the initial NR access, including signals for synchronization and system information, random access and pagingLTE/NR co-existence in the same spectrum, the benefits of their interworking as one systemThe different aspects of mobility in NR RF requirements for NR will be described both for BS and UE, both for the legacy bands and for the new mm-wave bandsGives a concise and accessible explanation of the underlying technology and standards for 5G NR radio-access technologyProvides detailed description of the NR physical-layer structure and higher-layer protocols, RF and spectrum aspects and co-existence and interworking with LTEGives insight not only into the details of the NR specification but also an understanding of why certain solutions look like they do
167 citations
03 Jun 2018
TL;DR: A detailed overview of the key technology features of the new 5G/NR radio-access technology is provided, the first release of which has recently been published by 3GPP release 15, of the NR specifications finalized by the end of 2017.
Abstract: This paper provides a detailed overview of the key technology features of the new 5G/NR radio-access technology, the first release of which has recently been published by 3GPP release 15, of the NR specifications finalized by the end of 2017. This first release is limited to non-standalone NR operation, implying that NR devices rely on LTE for initial access and mobility. The final release-15 specifications, to be available in June 2018, will also support stand-alone NR operation. The difference between stand-alone and non-standalone operation is primarily affecting higher layers and the interface to the core network; the basic radio technology is the same in both cases. This paper will give a detailed overview of the NR radioaccess technology with focus on the key features that distinguish it from 4G LTE.
96 citations
TL;DR: The articles in this special section focus on 5G mobile communication, which includes massive antenna technologies to provide beamforming gain and support increased capacity, new waveforms to flexibly accommodate various services and applications with different requirements, and new multiple access schemes to support massive connections.
Abstract: The articles in this special section focus on 5G mobile communication. With initial commercialization expected in 2020, fifth generation (5G) mobile communications is gathering increased interest and momentum around the world. Following discussions on the 5G vision and key requirements such as high data rate, low latency, and massive connectivity, various candidate technologies have been proposed and investigated. These new technologies include massive antenna technologies to provide beamforming gain and support increased capacity, new waveforms to flexibly accommodate various services and applications with different requirements, and new multiple access schemes to support massive connections. From a spectrum point of view, there is also increased interest in the use of spectrum above 6 GHz for 5G mobile communications.
20 citations
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01 Jan 2018
TL;DR: The chapter describes the high-level 5G use cases, eMBB, mMTC, and URLLC, and the 3GPP process for developing the new 5G/NR radio-access technology.
Abstract: The chapter gives background to 5G mobile communication, describing the earlier generations and the justification for a new generation. It describes the high-level 5G use cases, eMBB, mMTC, and URLLC. It also describes the 3GPP process for developing the new 5G/NR radio-access technology.
14 citations
[...]
01 Jan 2018
TL;DR: An overview of the 4G standard LTE and its evolution is provided in order to give a background and set the scene for the desccription of 5G NR.
Abstract: In this chapter, an overview of the 4G standard LTE and its evolution is provided in order to give a background and set the scene for the desccription of 5G NR.
5 citations
Patent•
02 Apr 2018TL;DR: In this paper, a transmission comprising a transport block (TB) comprising a plurality of code blocks arranged in one or more code block groups (CBGs) is sent to a receiver configured to use multi-bit hybrid automatic repeat request (HARQ) feedback per transport block.
Abstract: A method for use in a transmitter includes sending a transmission comprising a transport block (TB) comprising a plurality of code blocks (CBs) arranged in one or more code block groups (CBGs). Each code block group includes one or more code blocks and each code block includes a plurality of coded bits. The transmission is sent to a receiver configured to use multi-bit hybrid automatic repeat request (HARQ) feedback per transport block. The method further includes receiving HARQ ACK or NACK feedback from the receiver one or more of the one or more code block groups of the transport block. The method further includes determining a number of code blocks or code block groups to send to the receiver in a retransmission based on at least the received HARQ ACK or NACK feedback.
4 citations
[...]
01 Jan 2018
TL;DR: In this article, the authors describe the international process for regulating spectrum and how the present IMT spectrum has been assinged by the ITU-R. Based on the outcome of the most recent WRC, the candidate 5G spectrum is presented together with all the operating bands specified for NR in 3GPP.
Abstract: This chapter describes the internation al process for regulating spectrum and how the present IMT spectrum has been assinged by the ITU-R. Based on the outcome of the most recent WRC, the candidate 5G spectrum is presented together with all the operating bands specified for NR in 3GPP.
2 citations
01 Jan 2018
TL;DR: The chapter describes the NR uplink power control and uplink timing control and the similarities and differences to the corresponding LTE mechanisms are high-lighted.
Abstract: The chapter describes the NR uplink power control and uplink timing control. The similarities and differences to the corresponding LTE mechanisms are high-lighted. Especially, the NR mechanisms for beam-based power control are high-lighted.
2 citations
01 Jan 2018
TL;DR: The downlink controls signaling, including scheduling grants and assignments, will be described, followed by the uplink control signaling carrying the necessary feedback from the device.
Abstract: To support the transmission of downlink and uplink transport channels, there is a need for certain associated control signaling. This control signaling is often referred to as L1/L2 control signaling, indicating that the corresponding information partly originates from the physical layer (Layer 1) and partly from MAC (Layer 2). In this chapter, the downlink controls signaling, including scheduling grants and assignments, will be described, followed by the uplink control signaling carrying the necessary feedback from the device.
Patent•
07 Feb 2018TL;DR: In this article, a system and a method for scheduling a transmission of a message in a communication system is presented, which includes identifying (1020) major reference points and minor reference points (410) associated with a subframe (440).
Abstract: A system and method for scheduling a transmission of a message in a communication system. In an embodiment, the method (1000) includes identifying (1020) major reference points (410) and minor reference points (420) associated with a subframe (440). The method (1000) also includes scheduling (1030) a transmission of the message (400) to begin on one of the minor reference points (420) between the major reference points (410).
Patent•
11 May 2018
TL;DR: In this paper, the authors proposed two mechanisms for monitoring search spaces: the first is to monitor the device-specific search space for at least one device specific reference signal (RS) and the second one monitors the non-device-specific RS.
Abstract: There are provided mechanisms for monitoring search spaces. A first method performed by a wireless device comprises receiving an OFDM symbol in a downlink slot. At least part of the OFDM symbol is included in a device-specific search space and in a common search space. The first method comprises monitoring the device-specific search space for at least one device-specific reference signal (RS) and monitoring the common search space for at least one non-device-specific RS. In a second method, a radio access network node transmits an OFDM symbol included in a device-specific search space and in a common search space. The device-specific search space contains a device-specific RS, or the non-device specific search space contains a non-device-specific RS, or both of these apply.
Patent•
03 Apr 2018
TL;DR: In this article, a method for configuring and identifying a numerology to be utilized for a communication between a user equipment (102) and a network node (106) is provided.
Abstract: Methods and apparatus for configuring and identifying a numerology to be utilized for a communication between a user equipment (102) and a network node (106) are provided. An example method is provided for determining a numerology (111) to be used for communication with a network node (106) over a subset of time-frequency resources in a wireless communication system (100). The example method includes receiving a control signal from the network node (106) and determining the numerology (111) to be used for the communication based on the control signal. In an aspect, the numerology can be indicted by the control signal implicitly or explicitly. Example methods at the network node are also provided, as well as corresponding devices, computer programs, and instructions.
Patent•
28 Sep 2018
TL;DR: In this article, a wireless transmitter simultaneously transmits (1130) first and second signals in the frequency band in such a manner that the first and the second signals are multiplexed in the spectrum domain in frequency band, and the start time of the symbol interval in the first signal is aligned with the corresponding start time in the second signal at least once per time slot.
Abstract: FIELD: wireless communication equipment.SUBSTANCE: invention generally relates to wireless communication networks and, in particular, multi-mode multi-carrier configurations. In one aspect, the wireless transmitter generates (1110) first signal having a first integer number of symbol intervals in each of one or more time slots of a predetermined length, and generates (1120) second signal having a second integer number of symbol intervals in each of one or more time slots of a predetermined length, the second integer being different from the first integer.EFFECT: wireless transmitter simultaneously transmits (1130) first and second signals in the frequency band in such a manner that the first and second signals are multiplexed in the frequency domain in the frequency band, and in such a manner that the start time of the symbol interval in the first signal is aligned with the corresponding start time of the symbol interval in the second signal at least once per time slot.39 cl, 15 dwg, 2 tbl
Patent•
[...]
10 Jul 2018
TL;DR: In this paper, the authors discuss the problem of the lack of resources in the South Korean market and propose a solution to the problem. But, the solution is limited in the sense that it is difficult to implement.
Abstract: 확인응답식 접속(131)을 통해 제2 통신 노드(120)와 통신하기 위해 제1 통신 노드(110)에서 구현되는 방법은: 제2 통신 노드로부터 코드 블록들의 스트림을 수신하는 단계 - 각각의 코드 블록은 에러 검출을 가능하게 하는 체크 값과 연관되고, 미리 정의된 코드 블록들의 그룹에 속함 -; 각각의 연관된 체크 값들을 사용하여 수신된 코드 블록들의 에러들을 검출하는 단계; 및 상기 미리 정의된 코드 블록들의 그룹들 각각에 대한 확인응답을 제2 통신 노드로 송신하는 단계 - 확인응답의 음의 값은 미리 정의된 그룹 내의 코드 블록들 중 적어도 하나에 대해 에러가 검출되었음을 나타냄 - 를 포함하고, 미리 정의된 2개 이상의 코드 블록의 그룹에 대한 확인응답은 미리 정의된 그룹 내의 코드 블록들의 서브세트에 대한 에러 검출 결과들의 결합에 기초한다.
Patent•
23 Mar 2018TL;DR: In this article, a second wireless communication network coexists with a first wireless communication networks on a same bandwidth in frequency, wherein the first wireless communications network applies a first shift in frequency in uplink transmissions.
Abstract: Embodiments herein disclose e.g. a method performed by a wireless device (10) for handling communication for the wireless device in a second wireless communication network. The second wireless communication network coexists with a first wireless communication network on a same bandwidth in frequency, wherein the first wireless communication network applies a first shift in frequency in uplink transmissions. The wireless device receives from a radio network node (12,13), an indication indicating application of a second shift in frequency to uplink transmissions in case the second wireless communication network uses Frequency Division Duplex (FDD). The wireless device further applies the second shift in frequency to uplink transmissions, wherein the second shift defines a shift in frequency to a subcarrier relative to a subcarrier grid of the second wireless communication network or a shift in frequency to the subcarrier grid of the second wireless communication network.
Patent•
02 Feb 2018
TL;DR: In this paper, a downlink sub-frame shortening method and apparatus in a time division duplex system is presented, where a protection interval for switching an uplink subframe and a down-link subframe is created by shortening the downlink SUB-frame (that is, one or more symbol interval is not transmitted at the tail of the subframe).
Abstract: The invention provides a downlink sub-frame shortening method and apparatus in a time division duplex system. A protection interval for switching an uplink sub-frame and a downlink sub-frame is created by shortening the downlink sub-frame (that is, one or more symbol interval is not transmitted at the tail of the sub-frame). A permitted message comprises signaling indicating when to transmit the shortened sub-frame. An exemplary method is executed in a receiving node used for receiving the data from a transmission node in the sub-frame with a preset number of symbol intervals. In an LTE system, the receiving node can be UE, and the sub-frame is the downlink sub-frame. The exemplary method comprises: determining that 1120 receiving sub-frames are shortened relative to the preset number of symbol intervals, and omitting one or more symbols at the tails of the receiving sub-frames when the receiving sub-frames are processed in response to the determination, and omitting the last part of the 1130 receiving sub-frames.
Patent•
[...]
04 Jul 2018
TL;DR: In this article, the authors proposed a UE-based approach to solve the problem of the lack of resources in the South Korean market, where UE-1 UE-2 UE-3 UE-4 UE-5 UE-6 UE-7 UE-8 UE-9 UE-10 UE-11 UE-12 UE-14 UE-15 UE-16 UE-17 UE-18 UE-19 UE-20 UE-21
Abstract: 일 양태에서, 전송 노드는, 미리 결정된 길이를 갖는 제1 전송 간격에 걸쳐서 제1 UE로의 다운링크 전송을 스케줄링하고, 제1 전송 간격에서 제1 UE로의 다운링크 전송을 시작한다. 전송 노드는, 제1 UE로의 다운링크 전송에서 전송 홀의 제1 종단을 생성하기 위해 제1 전송 간격의 종단 이전에 제1 UE로의 다운링크 전송을 중단하고, 전송 홀의 제2 종단에서 제1 UE로의 다운링크 전송을 재개한다. 전송 노드는, 전송 홀 내에서, 제2 UE로부터의 업링크 전송을 수신하거나 더 높은 우선 순위 전송을 전송할 수 있다.
Patent•
06 Sep 2018
TL;DR: In this article, the authors proposed a means for providing information on the status of a CSI channel in a radio data transmission network, where the CSI estimates are transmitted in a CSI report for at least one CSI process configured for the wireless device to a network node.
Abstract: FIELD: radio engineering and communications.SUBSTANCE: invention relates to means for providing information on the status of a CSI channel in a radio data transmission network. Method performed by the wireless device for determining Channel State Information, CSI, estimates to be transmitted in a CSI report for at least one CSI process configured for the wireless device to a network node in a radio communications network, method comprises an order of actions: receiving a message comprising an indication to discard existing CSI estimates corresponding to a determined period of time and determining CSI estimates, which should be used in the CSI report to the network node, in accordance with the accepted indicator, in which the network node causes the wireless device to transmit CSI estimates corresponding to the CSI measurement results obtained from a single point in time.EFFECT: technical result is to improve the reporting of information on the state of the CSI channel in the radio data transmission network.24 cl, 5 dwg
Patent•
24 May 2018
TL;DR: In this article, a guard period for switching between an uplink and a downlink sub-frame is created by shortening the uplink subframe, that is, by executing no transmission during at least one symbol section on the leading edge of the subframe section.
Abstract: PROBLEM TO BE SOLVED: To provide a method for switching between an uplink and a downlink while maintaining interference between downlink transmission and uplink transmission to be minimum and maintaining control signaling to be minimum and to provide a wireless node in a dynamic time division duplex (TDD) system.SOLUTION: A guard period for switching an uplink sub-frame and a downlink sub-frame is created by shortening the uplink sub-frame, that is, by executing no transmission during at least one symbol section on the leading edge of the sub-frame section. A grant message includes a signaling showing the timing at which the shortened sub-frame should be transmitted.SELECTED DRAWING: Figure 16
Patent•
30 Jan 2018TL;DR: In this article, a method in a first device (101) for informing a second device (105) that an identity associated with the first device is at a certain location is described.
Abstract: The embodiments herein relate to a method in a first device (101) for informing a second device (105) that an identity associated with the first device (101) is at a certain location The first device (101) obtains information about the location of the first device (101) The first device (101) broadcasts, by means of device to device, D2D, communication, a message to be received by the second device (105) The message comprises the location information and an identity information associated with a user of the first device (101) The location information is transmitted on a first communications resource and the identity information is transmitted on a second communications resource
01 Jan 2018
TL;DR: This chapter describes some of the RF technologies needed at mm-Wave frequencies to implement devices and BS in frequency range 2.5-3.5 GHz for different implementation alternatives.
Abstract: This chapter describes some of the RF technologies needed at mm-Wave frequencies to implement devices and BS in frequency range 2. Challenges and possibilities are discussed for different implementation alternatives.
Patent•
05 Nov 2018
TL;DR: In this article, the authors proposed a method to solve the problem of the lack of resources in the South Korean market: 패턴의 시간-주파수 자원들 중 하나를 사용하여 데이터 송신
Abstract: 방법들 및 디바이스들이 물리 채널을 통한 데이터 송신과 관련된 미세 동기화를 가능하게 한다. 미세 타이밍 기준 신호가 때때로 수신자-특정 패턴의 시간-주파수 자원들 중 하나를 사용하여 데이터 송신 수신자에게 송신된다.
01 Jan 2018
TL;DR: This chapter provides a detailed description of the downlink and uplink physical-layer transport-channel processing including coding, modulation, multi-antenna precoding, resource-block mapping, and reference signal structure.
Abstract: This chapter provides a detailed description of the downlink and uplink physical-layer transport-channel processing including coding, modulation, multi-antenna precoding, resource-block mapping, and reference signal structure.
Patent•
27 Sep 2018TL;DR: In this article, a method for determining a starting symbol for a scheduled uplink transmission by a user equipment, UE, is proposed, which is implemented at a radio network node.
Abstract: The disclosure relates to a method (50), implemented at a radio network node, of determining a starting symbol for a scheduled uplink transmission by User Equipment, UE. The method comprises selecting (52) a starting symbol within an uplink slot for a scheduled uplink transmission by a UE; and identifying (54) the starting symbol to the UE.
Patent•
25 Jul 2018
TL;DR: In this article, the authors proposed a method to improve the performance of RATs by using a 5-level DL (5-DL) and a 2-layer DL (2-layer) model.
Abstract: 상이한 라디오 액세스 기술들에 기초하여 동작하는 네트워크 유닛(20, 30) 및 하나 이상의 연관된 무선 통신 디바이스(10-1, 0-2)가 제공된다 다운링크(DL)에서, 제1 RAT의 네트워크 유닛(20)은 제2 RAT의 주파수 채널보다 높은 제1 RAT의 주파수 채널에서 5 DL 캐리어를 송신하도록 구성된다 따라서, 무선 통신 디바이스(10-)는, 제2 RAT의 주파수 채널보다 높은 제1 RAT의 주파수 채널에서 제1 RAT의 DL 캐리어를 수신 및 복조 및/또는 디코딩하도록 구성된다 업링크(UL)에서, 무선 통신 디바이스(10-1)는, 제2 RAT의 업링크 주파수 채널과 중첩하는 업링크 주파수 채널에서 제1 RAT의 UL 캐리어를 송신하도록 구성된다 따라서, 네트워크 유닛(20)은, 제2 RAT의 업링크 주파수 채널과 중첩하는 업링크 주파수 채널에서 제1 RAT의 업링크(UL) 캐리어를 수신 및 복조 및/또는 디코딩하도록 구성된다