Methods and apparatus for supporting multiple services in a wireless communication system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2017-01-13
- Publication Date
- 2026-08-14
Smart Images
Figure CN116056223B_ABST
Abstract
Description
[0001] This application is a divisional application of application No. 201780013692.5, filed on January 13, 2017, entitled "Method and apparatus for supporting multiple services in a wireless communication system". Technical Field
[0002] This application generally relates to wireless communication systems. More specifically, this disclosure relates to several services within wireless systems. Background Technology
[0003] To meet the increased demand for wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as 'super 4G networks' or 'post-LTE systems'. 5G communication systems are considered to be implemented in higher frequency bands (mmWave), such as the 60GHz band, thereby achieving higher data rates. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are discussed in 5G communication systems. Furthermore, in 5G communication systems, the development of system network improvements is based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and receiver interference cancellation. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding and modulation (ACM), as well as filter row multiple carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.
[0004] The Internet, as a human-centric network for generating and consuming information, has evolved into the Internet of Things (IoT), in which information is exchanged and processed by physical entities, such as distributed objects, without human intervention. The Internet of Everything (IoE), a combination of IoT technologies connected to cloud servers and big data processing technologies, has emerged. With the need for technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology for IoT implementation, sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have recently been studied. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated in connected objects. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart instruments, and advanced medical services, through the aggregation and combination of existing information technology (IT) and various industrial applications.
[0005] Consistent with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communication can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (RAN), which serve as the aforementioned big data processing technologies, can also be considered an example of the convergence between 5G and IoT technologies.
[0006] The initial commercialization of fifth-generation (5G) mobile communications is expected around 2020, drawing increasing momentum from industry and academia in recent years through worldwide technical activities regarding various candidate technologies. Candidate enablers for 5G mobile communications include massive MIMO technologies ranging from traditional cellular bands to higher frequencies to provide beamforming gain and support increased capacity; new waveforms that flexibly adapt to various services / applications with different needs (e.g., new radio access technologies (RAT)); and new multiplexing access schemes supporting massive connectivity. The International Telecommunication Union (ITU) has categorized use cases for International Mobile Telecommunications (IMT) in 2020 and beyond into three main groups: enhanced mobile broadband, massive machine-type communications (MTC), and ultra-reliable and low-latency communications. In addition, the ITC has specified target requirements, such as a peak data rate of 20 Gb / s, a user experience data rate of 100 Mb / s, 3X spectral efficiency improvement, support for mobility up to 500 km / h, 1 ms latency, a connection density of 106 devices / km², 100X network energy efficiency improvement, and 10 Mb / s / m² regional traffic capacity. While not all requirements need to be met simultaneously, 5G network design should provide the flexibility to support various applications that partially meet these requirements based on usage scenarios.
[0007] The above information is presented as background information only to aid in understanding this disclosure. No determination is made, nor is any assertion made, regarding whether any of the above descriptions are applicable to prior art in relation to this disclosure. Summary of the Invention
[0008] Technical solution
[0009] According to various embodiments of this disclosure, a method performed by a user equipment (UE) in a wireless communication system. The method includes: receiving bandwidth configuration information from a base station (BS), the configuration information including information about frequency resources of the bandwidth and information about a second subcarrier spacing of the bandwidth; transmitting or receiving signals based on the configuration information; receiving, based on a default subcarrier spacing, an access signal from the BS including a synchronization signal and a broadcast signal for a master information block (MIB); and obtaining information associated with a first subcarrier spacing for random access based on the access signal.
[0010] According to various embodiments of this disclosure, a user equipment (UE) in a wireless communication system includes: a transceiver configured to receive bandwidth configuration information from a base station (BS), the configuration information including information about frequency resources of the bandwidth and information about a second subcarrier spacing of the bandwidth, and to transmit or receive signals based on the configuration information, and to receive an access signal from the BS, including a synchronization signal and a broadcast signal for a master information block (MIB), based on a default subcarrier spacing; and a processor operatively coupled to the transceiver, the processor configured to obtain information associated with a first subcarrier spacing for random access based on the access signal.
[0011] According to various embodiments of this disclosure, a base station (BS) in a wireless communication system includes: a transceiver configured to transmit bandwidth configuration information to a user equipment (UE), the configuration information including information about frequency resources of the bandwidth and information about a second subcarrier spacing of the bandwidth, and to transmit or receive signals based on the configuration information, and to transmit an access signal to the UE based on a default subcarrier spacing, including a synchronization signal and a broadcast signal for a master information block (MIB); and a processor operatively coupled to the transceiver, the processor configured to provide information associated with a first subcarrier spacing for random access based on the access signal.
[0012] According to various embodiments of this disclosure, a method performed by a base station (BS) in a wireless communication system includes: sending bandwidth configuration information to a user equipment (UE), the configuration information including: information about frequency resources of the bandwidth, and information about a second subcarrier spacing of the bandwidth; sending or receiving signals based on the configuration information; sending an access signal to the UE based on a default subcarrier spacing, including a synchronization signal and a broadcast signal for a master information block (MIB); and providing information associated with a first subcarrier spacing for random access based on the access signal.
[0013] According to various embodiments of this disclosure, a terminal device in a wireless communication system includes at least one transceiver and at least one processor. The at least one transceiver is configured to transmit a random access signal generated at a first subcarrier interval to a base station (BS) and to receive control signaling providing a resource configuration including a second subcarrier interval. The at least one processor is configured to perform communication using the resource configuration.
[0014] According to various embodiments of this disclosure, a base station device in a wireless communication system includes at least one processor and at least one transceiver. The at least one processor is configured to set resource configurations to perform communication. The at least one transceiver is configured to receive a random access signal generated from a terminal at a first subcarrier interval, and to transmit control signaling providing a resource configuration including a second subcarrier interval.
[0015] According to various embodiments of the present disclosure, a method for operating a terminal in a wireless communication system includes: transmitting a random access signal generated at a first subcarrier interval to a base station (BS), receiving control signaling providing a resource configuration including a second subcarrier interval, and performing communication by using the resource configuration.
[0016] According to various embodiments of the present disclosure, a method for operating a base station in a wireless communication system includes: setting a resource configuration to perform communication, receiving from a terminal a random access signal to be generated with a first subcarrier interval, and sending control signaling to provide a resource configuration including a second subcarrier interval.
[0017] Other technical features will be apparent to those skilled in the art from the following figures, description and claims. Attached Figure Description
[0018] For a more complete understanding of this disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which the same reference numerals denote similar parts:
[0019] Figure 1 The illustration shows an example wireless network according to an embodiment of the present disclosure;
[0020] Figure 2 The illustration shows an example eNB according to an embodiment of the present disclosure;
[0021] Figure 3 The illustration shows an example UE according to an embodiment of the present disclosure;
[0022] Figure 4A The diagram illustrates a high-level diagram of an orthogonal frequency division multiple access transmission path according to an embodiment of the present disclosure;
[0023] Figure 4B The diagram illustrates a high-level diagram of an orthogonal frequency division multiple access (OFDM) receiving path according to an embodiment of the present disclosure.
[0024] Figure 5 The illustration shows a network slice according to an embodiment of the present disclosure;
[0025] Figure 6 The illustration shows an example of a frame structure for a network supporting two segments according to an embodiment of the present disclosure;
[0026] Figure 7 The illustration shows an orthogonal frequency division multiplexing (OFDM) signal for a network supporting two segments according to an embodiment of the present disclosure;
[0027] Figure 8 The illustration shows an example of a frame structure for a network supporting multiple services according to an embodiment of the present disclosure;
[0028] Figure 9The illustration shows another example of a frame structure for a network supporting multiple services according to an embodiment of the present disclosure;
[0029] Figure 10 The illustration shows an example of a self-contained frame structure according to an embodiment of the present disclosure;
[0030] Figure 11A The illustration shows an example of a self-contained frame structure having two segments according to an embodiment of the present disclosure;
[0031] Figure 11B The illustration shows an example of a self-contained frame structure having a single segment according to an embodiment of the present disclosure;
[0032] Figure 11C The illustration shows another example of a self-contained frame structure having two segments according to an embodiment of the present disclosure;
[0033] Figure 12A The illustration shows an example of frame / subframe / TTI composition according to an embodiment of the present disclosure;
[0034] Figure 12B The illustration shows another example of frame / subframe / TTI composition according to an embodiment of the present disclosure;
[0035] Figure 13 The illustration shows an example of resource element mapping of data modulation symbols according to an embodiment of the present disclosure;
[0036] Figure 14 The illustration shows another example of resource element mapping of data modulation symbols according to an embodiment of the present disclosure;
[0037] Figure 15 The illustration shows yet another example of resource element mapping of data modulation symbols according to embodiments of the present disclosure;
[0038] Figure 16 The illustration shows an example of user equipment (UE) operation according to an embodiment of the present disclosure;
[0039] Figure 17 The illustration shows an example of a frame structure for ultra-reliable and low-latency (URLL) segments according to an embodiment of the present disclosure;
[0040] Figure 18 The illustration shows an example of a frame structure for an enhanced mobile broadband (eMBB) segment according to an embodiment of the present disclosure;
[0041] Figure 19 The illustration shows an example of multiple radio access technology (RAT) operation according to an embodiment of the present disclosure;
[0042] Figure 20The illustration shows an example of default OFDM digitization in frequency division multiplexing (FDM) according to an embodiment of the present disclosure;
[0043] Figure 21 The diagram illustrates the subcarrier index of a first synchronization signal according to an embodiment of the present disclosure;
[0044] Figure 22 The diagram illustrates the subcarrier index of a second synchronization signal according to an embodiment of the present disclosure;
[0045] Figure 23 The illustration shows an example of default numerics on a sub-band according to an embodiment of this disclosure;
[0046] Figure 24 The illustration shows an example of digitization on a sub-band according to an embodiment of the present disclosure;
[0047] Figure 25A The illustration shows an example of time and frequency resources for initial access according to an embodiment of the present disclosure;
[0048] Figure 25B The illustration shows another example of time and frequency resources for initial access according to an embodiment of the present disclosure;
[0049] Figure 25C The illustration shows an example of time and frequency resources for a physical downlink channel (PDCH) and a synchronization signal for initial access, according to an embodiment of the present disclosure.
[0050] Figure 26A The illustration shows an example of a resource index according to an embodiment of the present disclosure;
[0051] Figure 26B This describes another example of a resource index according to embodiments of the present disclosure; and
[0052] Figure 27 The illustration shows a reference signal (RS) mapping in subframe aggregation according to an embodiment of the present disclosure. Detailed Implementation
[0053] The following discussion Figures 1 to 27 The various embodiments used to describe the principles of this disclosure in this patent document are merely illustrative and should not be construed as limiting the scope of this disclosure in any way. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged system or apparatus.
[0054] The following document is included hereby by reference as if it were set forth herein: 3GPP TR22.891 v1.2.0, “Study on New Service and Markets Technology Enablers.”
[0055] Before proceeding with the following detailed description, it may be helpful to provide definitions for certain words and phrases used throughout this patent document. The term “coupled” and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether those elements are physically in contact with each other. The terms “transmit,” “receive,” and “communicate,” and their derivatives, include both direct and indirect communication. The terms “comprise” and “include,” and their derivatives, mean unrestricted inclusion. The term “or” is inclusive, meaning and / or. The phrase “associated with,” and its derivatives, mean including, being included in, interconnected with, containing, being contained within, connected to or connected with, coupled to or coupled with, capable of communicating with, capable of cooperating with, intertwined, juxtaposed, proximate, joined to or joined with, having, possessing the characteristics of, having a relationship with, or having a relationship with, etc. The term “controller” refers to any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and / or firmware. The functionality associated with any particular controller may be centralized or distributed, whether local or remote. The phrase “at least one of…” when used with a list of items refers to the possibility that different combinations of one or more of the listed items may be used, or that only one item in the list may be required. For example, “at least one of A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.
[0056] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each computer program being formed by computer-readable program code and specifically manifested as a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation in appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, optical disc (CD), digital video disc (DVD), or any other type of memory. "Non-volatile" computer-readable media excludes wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transient computer-readable media includes media in which data can be permanently stored and media in which data can be stored and subsequently rewritten, such as rewritable optical discs or erasable memory devices.
[0057] The patent document provides definitions for certain other words and phrases. Those skilled in the art will understand that in many, if not most, examples, this definition applies to the prior and future use of the words and phrases defined herein.
[0058] the following Figures 1 to 4B Various embodiments are described in wireless communication systems and implemented using orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication technologies. Figures 1-3 The description is not intended to imply any physical or structural limitation on the different embodiments that may be implemented. Different embodiments of this disclosure can be implemented with any suitably arranged communication system.
[0059] Figure 1 Figure 100 illustrates an example wireless network according to an embodiment of the present disclosure. Figure 1 The embodiments of the wireless network shown in 100 are for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.
[0060] like Figure 1 As shown in Figure 100, the wireless network includes eNB 101, eNB 102, and eNB 103. eNB 101 communicates with eNB 102 and eNB 103. eNB 101 also communicates with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.
[0061] eNB 102 provides wireless broadband access to network 130 to a first plurality of user equipments (UEs) within its coverage area 120. The first plurality of UEs includes UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M), such as a cellular phone, wireless laptop, wireless PDA, etc. eNB 103 provides wireless broadband access to network 130 to a second plurality of UEs within its coverage area 125. This second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of eNBs 101-103 may communicate with each other and with UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.
[0062] Depending on the network category, the term "base station" or "BS" can refer to any component (or set of components) configured to provide wireless access to a network, such as a transmit point (TP), transceiver point (TRP), enhanced base station (eNodeB or eNB), 5G base station (gNB), macrocell, femtocell, WiFi access point (AP), or other wireless-enabled device. A base station can provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP New Radio Interface / Access (NR), Long Term Evolution (LTE), Advanced LTE (LTE-A), High Speed Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term "user equipment" or "UE" can refer to any component such as a "mobile station," "user station," "remote terminal," "wireless terminal," "receiving point," or "user device." For convenience, the terms “user equipment” and “UE” are used in this patent document to refer to remote wireless equipment that wirelessly accesses the BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or a generally considered stationary device (such as a desktop computer or vending machine).
[0063] The dashed lines show the approximate extent of coverage areas 120 and 125. For illustrative and explanatory purposes only, coverage areas 120 and 125 are shown as approximately circular. It should be clearly understood that the coverage areas associated with the eNB, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the eNB and variations in the radio environment associated with natural and man-made obstructions.
[0064] As described in more detail below, one or more of UEs 111-116 include circuitry, procedures, or combinations thereof for efficient CSI (Channel State Information) reporting on the PUCCH (Physical Uplink Control Channel) in an advanced wireless communication system. In some embodiments, one or more of eNBs 101-103 include circuitry, procedures, or combinations thereof for receiving efficient CSI reports on the PUCCH in an advanced wireless communication system.
[0065] Although Figure 1 A diagram of a wireless network is shown in Figure 100. Figure 1100 can be modified in various ways. For example, the wireless network may include any number of eNBs and any number of UEs in any suitable arrangement. Furthermore, eNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each eNB 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Additionally, eNBs 101, 102, and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.
[0066] Figure 2 Figure 200 illustrates an example eNB 102 according to an embodiment of the present disclosure. Figure 2 The embodiment of eNB 102 illustrated in Figure 200 is for illustrative purposes only, and Figure 1 eNBs 100, 101, and 103 can have the same or similar configurations. However, eNBs have various configurations, and Figure 2 200 does not limit the scope of this disclosure to any particular implementation of the eNB.
[0067] like Figure 2 As shown in Figure 200, the eNB 102 includes multiple antennas 205a-205n, multiple RF transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. The eNB 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.
[0068] RF transceivers 210a-210n receive incoming RF signals from antennas 205a-205n, such as signals transmitted by a UE in network 100. RF transceivers 210a-210n down-convert the incoming RF signals to generate an IF or baseband signal. This IF or baseband signal is sent to RX processing circuitry 220, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 220 sends the processed baseband signal to controller / processor 225 for further processing.
[0069] In some embodiments, the RF transceivers 210a-201n are also capable of receiving random access signals generated with a first subcarrier interval from the user equipment (UE) and transmitting downlink control signaling including physical (PHY) resource configurations containing a second subcarrier interval.
[0070] In some embodiments, the RF transceiver 210a-201n is also capable of transmitting PHY resource configuration (which includes downlink synchronization signals) in a subband located at the center of the system bandwidth, and performing at least one of uplink reception or downlink transmission according to the PHY resource configuration.
[0071] In some embodiments, the RF transceivers 210a-201n are also capable of transmitting downlink control signaling that includes multiple PHY resource configurations, each PHY resource configuration containing a subcarrier spacing value.
[0072] The TX processing circuit 215 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuit 215 encodes, multiplexes, and / or digitizes the transmitted baseband data to generate a processed baseband or IF signal. RF transceivers 210a-210n receive the transmitted processed baseband or IF signal from the TX processing circuit 215 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 205a-205n.
[0073] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the eNB 102. For example, the controller / processor 225 may, based on known principles, control the reception of forward channel signals and the transmission of reverse channel signals via RF transceivers 210a-210n, RX processing circuitry 220, and TX processing circuitry 215. The controller / processor 225 may also support additional functions, such as more advanced wireless communication capabilities. For example, the controller / processor 225 may support beamforming or directional routing operations, wherein signals emitted from multiple antennas 205a-205n are weighted differently to effectively guide the emitted signals in a desired direction. Any number of other functions may be supported in the eNB 102 by the controller / processor 225.
[0074] In some embodiments, controller / processor 225 includes at least one microprocessor or microcontroller. As described in more detail below, eNB 102 may include circuitry, programs, or a combination thereof for processing CSI reports on the PUCCH. For example, controller / processor 225 may be configured to execute one or more instructions stored in memory 230, which are configured to cause the controller / processor to process feedback components such as vector quantization of channel coefficients.
[0075] The controller / processor 225 can also execute programs and other processes residing in the memory 230, such as an operating system. The controller / processor 225 can move data into or out of the memory 230 as needed by executing these processes.
[0076] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the eNB 102 to communicate with other devices or systems via a backhaul connection or network. Interface 235 can support communication via one or more suitable wired or wireless connections. For example, when the eNB 102 is implemented as part of a cellular communication system (such as supporting 5G, LTE, or LTE-A), interface 235 can allow the eNB 102 to communicate with other eNBs via a wired or wireless backhaul connection. When the eNB 102 is implemented as an access point, interface 235 can allow the eNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). Interface 235 includes any suitable architecture supporting communication via wired or wireless connections, such as Ethernet or RF transceivers.
[0077] In some embodiments, the controller / processor 225 is also capable of configuring PHY resources for at least one of uplink reception or downlink transmission.
[0078] In this embodiment, the PHY resource configuration includes multiple configurations containing subcarrier spacing values and information for subbands, the subcarrier spacing values being used for at least one subband for uplink reception or downlink transmission. In this embodiment, the PHY resource configuration further includes information indicating the existence of blanking gaps at the boundaries of consecutive time slots on which the UE is scheduled to receive multiple transport blocks. In this embodiment, the PHY resource configuration further includes information for generating a reference signal scrambling sequence. In this embodiment, the PHY resource configuration includes resources corresponding to at least one of Ultra Reliable and Low Latency (URLL) configuration information, Enhanced Mobile Broadband (eMBB) configuration information, or Massive Machine-Type Communication (mMTC) configuration information.
[0079] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory 230 or other ROM.
[0080] Although Figure 2 A 200-figure example of an eNB 102 can be used for... Figure 2 200 makes various changes. For example, eNB102 can include... Figure 2Each component can be any number shown in 200. As a specific example, an access point may include multiple interfaces 235, and the controller / processor 225 may support routing functionality to route data between different network addresses. As another specific example, although shown as a single instance including TX processing circuitry 215 and a single instance including RX processing circuitry 220, the eNB 102 may include multiple instances of each (e.g., one per RF transceiver). Furthermore, Figure 2 The various components in 200 can be combined, further subdivided or omitted, and additional components can be added as needed.
[0081] Figure 3 Figure 300 illustrates an example UE 116 according to an embodiment of this disclosure. Figure 3 The embodiment of UE 116 illustrated in Figure 300 is for illustrative purposes only, and Figure 1 UEs 111-115 of type 100 can have the same or similar configurations. However, UEs have multiple configurations, and Figure 3 300 does not limit the scope of this disclosure to any particular implementation of the UE.
[0082] like Figure 3 As shown in Figure 300, UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a TX processing circuit 315, a microphone 320, and a receive (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, a touchscreen 350, a display 355, and memory 360. Memory 360 includes an operating system (OS) 361 and one or more applications 362.
[0083] RF transceiver 310 receives incoming RF signals transmitted by the eNB of network 100 from antenna 305. RF transceiver 310 down-converts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 325 sends the processed baseband signal to speaker 330 (e.g., for voice data) or to processor 340 for further processing (e.g., for web browsing data).
[0084] In some embodiments, the RF transceiver 310 is capable of transmitting random access signals generated with a first subcarrier interval to a base station (BS) and receiving downlink control signaling including physical (PHY) resource configurations containing a second subcarrier interval.
[0085] In some embodiments, the RF transceiver 310 is capable of receiving PHY resource configuration in a subband located at the center of the system bandwidth, the subband including a downlink synchronization signal, and performing at least one of uplink transmission or downlink reception according to the PHY resource configuration.
[0086] In some embodiments, the RF transceiver 310 is capable of receiving downlink control signaling including multiple PHY resource configurations, each PHY resource configuration containing a subcarrier spacing value.
[0087] The TX processing circuit 315 receives analog or digital voice data from the microphone 320 or other transmitted baseband data (such as network data, email, or interactive video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the transmitted baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the transmitted processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.
[0088] Processor 340 may include one or more processors or other processing devices and executes OS 361 stored in memory 360 to control the overall operation of UE 116. For example, processor 340 may control the reception of forward channel signals and the transmission of reverse channel signals through RF transceiver 310, RX processing circuitry 325 and TX processing circuitry 315, based on known principles. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.
[0089] Processor 340 is also capable of executing other processing and programs residing in memory 360, such as processing for CSI reports on PUCCH. Main processor 340 can move data to or from memory 360 as needed by executing processing. In some embodiments, processor 340 is configured to execute application 362 based on OS 361 or in response to signals received from eNB or operator. Processor 340 is also coupled to I / O interface 345, which provides UE 116 with the ability to connect to other devices such as laptops and handheld computers. I / O interface 345 is the communication path between these accessories and processor 340.
[0090] In some embodiments, the processor 340 is also capable of configuring a PHY resource configuration for at least one of uplink transmission or downlink reception. In this embodiment, the PHY resource configuration includes multiple configurations containing subcarrier spacing values and information for subbands, the subcarrier spacing values being used for subbands for at least one of uplink transmission or downlink reception. The information for subbands may indicate at least one of the bandwidth of the subband or the number of subcarriers included in the subband. In this embodiment, the PHY resource configuration further includes information indicating the existence of blank gaps at the boundaries of consecutive time slots on which the UE is scheduled to receive multiple transport blocks. In this embodiment, the PHY resource configuration further includes information for generating a reference signal scrambling sequence. In this embodiment, the PHY resource configuration includes resources corresponding to at least one of Ultra Reliable and Low Latency (URLL) configuration information, Enhanced Mobile Broadband (eMBB) configuration information, or Massive Machine-Type Communication (mMTC) configuration information.
[0091] The processor 340 is also coupled to the touchscreen 350 and the display 355. The operator of the UE 116 can use the touchscreen 350 to input data into the UE 116. The display 355 may be a liquid crystal display, a light-emitting diode display, or other display capable of displaying, for example, text and / or at least limited graphics from a website.
[0092] The memory 360 is coupled to the processor 340. A portion of the memory 360 may include random access memory (RAM), and another portion of the memory 360 may include flash memory or other read-only memory (ROM).
[0093] Although Figure 3 300 diagram illustrates an example of UE 116, which can be used for... Figure 3 300 can be modified in various ways. For example, the various components in Figure 3300 can be combined, further subdivided, or omitted, and additional components can be added as needed. As a specific example, processor 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although... Figure 3 The UE 116 in Figure 300 is configured as a mobile phone or smartphone, but the UE can be configured as other types of mobile or stationary devices.
[0094] Figure 4A 400 is a high-level diagram of the transmit path circuitry system. For example, the transmit path circuitry system can be used for orthogonal frequency division multiple access (OFDMA) communication. Figure 4B450 is a high-level diagram of the receive path circuitry system. For example, the receive path circuitry system can be used for Orthogonal Frequency Division Multiple Access (OFDMA) communication. Figure 4A 400 and Figure 4B In 450, for downlink communication, the transmit path circuitry can be implemented in the base station (eNB) 102 or a relay station, and the receive path circuitry can be implemented in the user equipment (e.g., Figure 1 This is implemented in user equipment 116 (100). In other examples, for uplink communication, the receive path circuit system 450 can be implemented in the base station (e.g., Figure 1 The transmission path circuitry can be implemented in the eNB (eNB 102) or relay station (e.g., 100), and the transmission path circuitry can be implemented in the user equipment (e.g., 100). Figure 1 Implemented in user equipment 116 of 100.
[0095] The transmit path circuitry includes a channel coding and modulation block 405, a serial-to-parallel (S to P) block 410, a big-N inverse fast Fourier transform (IFFT) block 415, a parallel-to-serial (P to S) block 420, a cyclic prefix addition block 425, and an up-converter (UC) 430. The receive path circuitry includes a down-converter (DC) 455, a cyclic prefix removal block 460, a serial-to-parallel (S to P) block 465, a big-N fast Fourier transform (FFT) block 470, a parallel-to-serial (P to S) block 475, and a channel decoding and demodulation block 480.
[0096] Figure 4A 400 and Figure 4B At least some of the components in 450 can be implemented in software, while other components can be implemented in configurable hardware or a hybrid of software and configurable hardware. Specifically, note that the FFT and IFFT blocks described in this disclosure can be implemented as configurable software algorithms, where the value of size N can be modified depending on the implementation.
[0097] Furthermore, while this disclosure relates to embodiments implementing the Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT), this is by way of illustration only and should not be construed as limiting the scope of this disclosure. It will be understood that in alternative embodiments of this disclosure, the FFT and IFFT functions can be readily replaced by Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions, respectively. It will be understood that for the DFT and IDFT functions, the value of the N variable can be any integer (i.e., 1, 4, 3, 4, etc.), while for the FFT and IFFT functions, the value of the N variable can be any integer raised to the power of two (i.e., 1, 2, 4, 8, 16, etc.).
[0098] In the transmit path circuitry system 400, the channel coding and modulation block 405 receives a set of information bits and applies coding (e.g., LDPC coding) and modulation (e.g., Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) input bits to generate a sequence of frequency-domain modulated symbols. The serial-to-parallel block 410 converts (i.e., demultiplexes) the serially modulated symbols into parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in BS 102 and UE 116. The size N IFFT block 415 then performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block 420 converts (i.e., multiplexes) the parallel time-domain output symbols from the size N IFFT block 415 to generate a serial time-domain signal. The cyclic prefix addition block 425 then inserts a cyclic prefix into the time-domain signal. Finally, the upconverter 430 modulates (i.e., upconverts) the output of the cyclic prefix addition block 425 to the RF frequency for transmission via the radio channel. The signal can also be filtered in the baseband before being converted to the RF frequency.
[0099] The transmitted RF signal reaches UE 116 after passing through the wireless channel, and performs the reverse operations as in eNB 102. Downconverter 455 downconverts the received signal to the baseband frequency, and cyclic prefix removal block 460 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 465 converts the time-domain baseband signal into a parallel time-domain signal. Size N FFT block 470 then performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 475 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 480 demodulates and then decodes the modulated symbols to recover the original input data stream.
[0100] Each of eNBs 101-103 can implement a transmit path similar to that for transmission to user equipment 111-116 in the downlink, and a receive path similar to that for reception from user equipment 111-116 in the uplink. Similarly, each of user equipment 111-116 can implement a transmit path corresponding to the architecture for transmission to eNBs 101-103 in the uplink, and a receive path corresponding to the architecture for reception from eNBs 101-103 in the downlink.
[0101] Various embodiments of this disclosure provide high-performance scalability with respect to the number and geometry of transmit antennas, and a flexible CSI feedback (e.g., reporting) framework and structure for LTE enhancement when supporting FD-MIMO with large 2D antenna arrays. To achieve high performance, eNBs, particularly for FDD scenarios, require more accurate CSI regarding the MIMO channel. In this case, embodiments of this disclosure recognize the need to replace previous LTE (e.g., Rel.12) precoding frameworks (PMI-based feedback). In this disclosure, the properties of FD-MIMO are considered. For example, the use of large, closely spaced 2D antenna arrays primarily points to high beamforming gain rather than spatial multiplexing and relatively small angular spread for each UE. Therefore, compression or dimensionality reduction of channel feedback based on a fixed set of basis functions and vectors can be achieved. In another example, updated channel feedback parameters (e.g., channel angular spread) can be obtained with low mobility using UE-specific higher-layer signaling. Additionally, CSI reporting (feedback) can also be performed cumulatively.
[0102] Another embodiment of this disclosure incorporates a CSI reporting method and process with reduced PMI feedback. This lower-rate PMI report is based on long-term DL channel statistics and represents a selection of a set of precoding vectors recommended by the UE to the eNB. This disclosure also includes a DL transmission scheme in which the eNB transmits data to the UE via multiple beamforming vectors when utilizing an open-loop diversity scheme. Therefore, the use of long-term precoding ensures that open-loop transmit diversity is applied only across a limited number of ports (rather than all ports available for FD-MIMO, e.g., 64). This avoids having to support excessively high dimensionality for open-loop transmit diversity, reduces the total overhead of CSI feedback when CSI measurement quality is unreliable, and improves robustness.
[0103] The use cases for 5G communication systems have been identified and described. These use cases can be broadly categorized into three different groups based on the type of service. The first group consists of primary services requiring high data transmission rates. Primary service refers to eMBB (enhanced Mobile Broadband). Primary service can be used for technologies requiring high average spectral efficiency. For example, primary service can be used for traditional mobile communications, virtual reality technologies, etc. In other words, primary service is determined when high bit / second requirements are needed, with less stringent latency and reliability requirements.
[0104] The second group is for secondary services requiring high reliability and low latency. The secondary service is indicated by URLL (Ultra-Reliable and Low-Latency). Secondary services can be used in technologies with relatively high requirements for reliability, latency, and throughput. For example, secondary services can be used for communication processing required in control of faulty networks, remote operation, and autonomous vehicles. In other words, the secondary service is determined when bit / second requirements are less stringent.
[0105] The third group is for third-party services that require large-scale terminal connectivity. Third-party services refer to massive machine-type communication (mMTC). Third-party services require high random access capacity and low power consumption to allow connectivity with a large number of terminals. The number of devices can be as high as 100,000 to 1,000,000 per square kilometer, but reliability / throughput / latency requirements may be less stringent for third-party services. This scenario may also involve power factor requirements, where battery consumption should be minimized as much as possible.
[0106] In LTE technology, time slot X may include one or more of a DL (Downlink Control) transmission portion, a protection portion, a UL (Uplink UL) transmission portion, and combinations thereof, regardless of whether they are dynamically and / or semi-statically indicated. Furthermore, in one example, the DL transmission portion of time slot X includes downlink control information and / or downlink data transmission and / or reference signals. In another example, the UL transmission portion of time slot X includes uplink control information and / or uplink data transmission and / or reference signals. Additionally, the use of DL and UL does not preclude other deployment scenarios, such as sidelinks, backhaul, and relays. In some embodiments of the invention, "subframe" refers to another name for "time slot X," or vice versa. For 5G networks to support these different services, this is referred to as network slicing.
[0107] In some embodiments, "subframe" and "time slot" may be used interchangeably. In some embodiments, "subframe" refers to a transmit time slot (TTI), which may include a set of "time slots" for data transmission / reception by the UE.
[0108] In some embodiments, for ease of explanation, parameters, functions, operations, and information related to the physical layer will be referred to as "PHY". For example, optimization operations at the physical layer may be referred to as "PHY optimization".
[0109] Figure 5 Figure 500 illustrates a network slice according to an embodiment of the present disclosure. Figure 5 The network slicing examples shown in 500 are for illustrative purposes only. Figure 5 One or more components illustrated in 500 can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. Figure 5As shown in 500, the network slice includes the operator's network 510, multiple RANs 520, multiple eNBs 530a and 530b, multiple small cell base stations 535a and 535b, URLL segment 540a, smartwatch 545a, car 545b, truck 545c, smart lawn 545d, power supply 555a, temperature 555b, mMTC segment 550a, eMBB segment 560a, smartphone (e.g., cellular phone) 565a, laptop 565b, and tablet 565c (e.g., tablet PC).
[0110] The operator's network 510 includes multiple radio access networks 520 – RANs associated with network devices such as eNBs 530a and 530b, small cell base stations (femtocell / picocell eNBs or Wi-Fi access points) 535a and 535b. The operator's network 510 can rely on segment concepts to support various services. In one example, the network supports four segments 540a, 550a, 550b, and 560a. The URLL segment 540a serves UEs requiring URLL services, such as cars 545b, trucks 545c, smartwatches 545a, smart glasses 545d, etc. Two mMTC segments 550a and 550b serve UEs requiring mMTC services, such as power meters and temperature control (e.g., 555b), and one eMBB segment 560a serves UEs requiring eMBB services, such as cellular phones 565a, laptops 565b, and tablets 565c.
[0111] In simple terms, network slicing is a method for handling various quality of service (QoS) differences at the network level. To effectively support these different QoS levels, fragment-specific PHY optimizations may also be required. Devices 545a / b / c / d and 555a / b are examples of different types of user equipment (UEs), 565a / b / c. Figure 5 The different types of user equipment (UE) shown in 500 are not necessarily associated with a specific slice type. For example, cellular phone 565a, laptop 565b, and tablet 565c are associated with eMBB slice 560a, but this is for illustrative purposes only and these devices can be associated with any type of slice.
[0112] In some embodiments, a device is configured with more than one segment. In one embodiment, the UE (e.g., 565a / b / c) is associated with two segments, a URLL segment 540a and an eMBB segment 560a. This can be useful for supporting online gaming applications, where graphical information is sent via the eMBB segment 560a and information about user interactions is exchanged via the URLL segment 540a.
[0113] In the current LTE standard, no segment-level PHY is available, and most PHY functions are used in a segment-agnostic manner. UEs are typically configured with a single set of PHY parameters (including transmit time interval (TTI) length, OFDM symbol length, subcarrier spacing, etc.), which is likely to prevent the network from (1) quickly adapting to dynamically changing QoS; and (2) simultaneously supporting various QoS requirements.
[0114] In some embodiments, corresponding PHY designs for addressing different QoS levels using the network slicing concept are disclosed. Note that "slice" is a term introduced for convenience only, referring to a logical entity associated with common characteristics, such as digitization, upper layers (including Media Access Control / Radio Resource Control (MAC / RRC)), and shared UL / DL time-frequency resources. Alternative names for "slice" include virtual cell, supercell, cell, etc.
[0115] Figure 6 Figure 600 illustrates an example of a frame structure for a network supporting two segments according to an embodiment of the present disclosure. Figure 6 The embodiment of OFDM signal for supporting a two-segment network shown in 600 is for illustrative purposes only. Figure 6 One or more components illustrated in 600 may be implemented as a dedicated circuit system configured to perform the function, or one or more components may be implemented by one or more processors that execute instructions to perform the function. Other embodiments may be used without departing from the scope of this disclosure.
[0116] like Figure 6 As shown in Figure 600, the frame structure for supporting the network with two segments 600 includes a first segment 610 and a second segment 650. Furthermore, the first segment 610 includes data (frame / subframe / TTI) gaps 630a, control (CTRL) gaps 620a, 660a, and 660b, and data frames / subframes / TTIs (data gaps) 2 670a and 670b for the segment. Similarly, the second segment 650 includes control (CTRL) 620b, data frames / subframes / TTIs for segment 1 630b, control (CTRL) 660c, and data frames / subframes / TTIs for segment 2 670c.
[0117] In some embodiments, for two segments, for example, the UE is configured in a higher layer (e.g., RRC) to transmit / receive signals related to two segments, such as segments 1 and 2, where segment 1 is an eMBB segment 560a and segment 2 is a URLL segment 540a. In some embodiments, the PHY signals related to the two segments are multiplexed by the network into frequency division multiplexing (FDM), as shown in 610. In one such embodiment, the two BWs (bandwidths) corresponding to the two segments are subbands of the serving cell BW. In some embodiments, the two BWs corresponding to the two segments are two separate serving cell BWs. In this case, a protection BW may exist between the two BWs corresponding to the two segments. In some embodiments, the PHY signals related to the two segments are multiplexed by the network into time division multiplexing (TDM) in the serving BW, as shown in 650.
[0118] In some alternative embodiments, the PHY signals associated with the two segments are multiplexed by the network into code division multiplexing (CDM). In this embodiment, a first code is assigned to the PHY signal for the first segment, and a second code is assigned to the PHY signal for the second segment. In some embodiments, the PHY signals associated with the two segments are SDMed. In this embodiment, a first precoder is applied to the PHY signal for the first segment, and a second precoder is applied to the PHY signal for the second segment. In some embodiments, a first set of TPs transmits / receives the PHY signal for the first segment, and a second set of TPs transmits / receives the PHY signal for the second segment. In some embodiments, the PHY control and data transmission / reception for those UEs are configured to handle segments occurring within the time-frequency resources allocated for the configured segments.
[0119] In some embodiments, a subframe equivalent to (or potentially equivalent to) a Transmission Time Interval (TTI) includes control time-frequency resources and data time-frequency resources. In this embodiment, a subframe of segment 1 includes a control interval 620a (or 620b) and a data interval 630a (or 630b). Control signaling in 620a (620b) indicates PHY data scheduling information in the time-frequency pool of 630a (or 630b) to UEs configured with segment 1.
[0120] In some embodiments, the subframe of segment 2 includes a control gap 660a (or 660b or 660c) and a data gap 670a (or 670b or 670c). Control signaling in 660a (or 660b or 660c) can indicate PHY data scheduling information in the time-frequency pool of 670a (or 670b or 670c) to UEs configured with segment 2. In some embodiments, the subframe length (or TTI length) can be configured segment-specifically. In one example, a first TTI length is configured for the first segment and a second TTI length is configured for the second segment. In this embodiment, the first segment corresponds to segment 1 (eMBB segment 160a), and the second segment corresponds to segment 2 (URLL segment 140a), and the subframe length of the first segment is twice the subframe length of the second segment (m=2) (generally, an integer multiple). In this case, the URLL fragment 540a satisfies the delay constraint (the delay is halved when the subframe length is half), and the eMBB fragment 560a satisfies the spectral efficiency requirement (the total control overhead is halved when the subframe length is twice that of the original). The integer relationship of the subframe length can help the network to more effectively partition the fragments using FDM.
[0121] A specific integer (m) value can be explicitly or implicitly signaled to the UE or a segment of the UE (or virtual cell). In one example, the m value is indicated by a single field, for example, transmitted via broadcast or unicast signaling. In another example, state 0 means m=1 and state 1 means m=2. In yet another example, state 0 means m=1 and state 1 means m=4. In yet another example, state 0 means m=2 and state 1 means m=4. In yet another example, the m value is indicated by a two-field field, for example, transmitted via broadcast or unicast signaling. In one example, state 00 means m=1, state 01 means m=2; state 10 means m=4; and state 11 is reserved.
[0122] In some embodiments, the subframe length is described in terms of OFDM symbols. In one example, the subframe length of eMBB segment (segment 1) 540a is 70 (= 14 × 5 or alternatively 56 = 14 × 4) OFDM symbols, and the subframe length of URLL segment (segment 2) is 14 OFDM symbols.
[0123] In some embodiments, the length of the control gaps (e.g., 620a / b, 660a / b / c) can be configured specifically for the data frame. In this embodiment, the length of the control gap 620a of the eMBB segment (segment 1) 560a is longer than the length of the control gap 660b of the URLL segment (segment 2) 540a. The control gaps of 660a / b can be dynamically adjusted to accommodate different numbers of UEs being served in data frames 260a / b.
[0124] In some embodiments, similar to the PDCCH gaps, the control gaps (620a / b, 660a / b / c) correspond to the PHY DL control gaps. In some embodiments, regions 630a / b and 670a / b / c correspond to sequences of subframes containing only data (i.e., no PHY control is embedded in 630a / b and 670a / b). In these cases, control regions 620a / b and 660a / b / c may correspond to various numbers of OFDM symbols.
[0125] In some embodiments, each of 630a / b and 670a / b / c corresponds to a single self-contained subframe 610 / 615 for DL data transmission, wherein uplink control signaling (A / N) 640a / b is multiplexed at the end of subframe 610 / 615.
[0126] Figure 7 Figure 700 illustrates an orthogonal frequency division multiplexing (OFDM) signal for a network supporting two segments according to an embodiment of the present disclosure. Figure 7 The embodiment of OFDM signal for supporting a two-segment network shown in 700 is for illustrative purposes only. Figure 7 One or more components illustrated in 700 may be implemented as a dedicated circuit system configured to perform the function, or one or more components may be implemented by one or more processors that execute instructions to perform the function. Other embodiments may be used without departing from the scope of this disclosure.
[0127] like Figure 7 As shown in 700, the OFDM signals used to support the network of the two segments 700 include multiple BWs 710, 750, OFDM symbols (durations) 720, 760, CP 720a, multiple IFFTs 720b, 760a, 760b, subcarrier partitioning for segment 1 730, subcarrier partitioning option 1 for segment 2 770a, and subcarrier partitioning option 2 for segment 2 770b.
[0128] Figure 7 Figure 700 illustrates an OFDM symbol structure according to certain embodiments of the present invention, which facilitates network FDM partitioning into two bands, BW1 710 and BW2 750, to support two segments.
[0129] In some embodiments, the PHY signal of the first segment resides within BW1 710, and the PHY signal of the second segment resides within BW2 750. In one such embodiment, the first segment corresponds to eMBB segment 560a, and the second segment corresponds to URL segment 540a. A protection BW 790 may exist between the two BW partitions 710 and 750. When the protection BW 790 is configured for the UE, it is not expected that the UE will transmit / receive on the protection BW 790. The rejection / conversion band of the BW-specific filter may be located in the BW corresponding to 790.
[0130] In some embodiments, the UE is configured to receive two segments; and is also configured with the same set of digital parameters for the two BW 710 and 750. In some embodiments, the UE is configured to receive two segments; and is also configured with two different sets of digital parameters for the two BW 710 and 750. In this embodiment, the digital parameters include at least one of CP length, subcarrier spacing, OFDM symbol length, FFT size, etc.
[0131] A digitizer refers to a unit of configuration of resources (i.e., time, frequency) used in a transmission (i.e., unicast transmission). For example, an LTE system uses a single digitizer with a subcarrier spacing of 15 kHz in unicast transmission. In this disclosure, various digitizers will be described for supporting a wide frequency range (i.e., similar to 1-100 GHz) and various service schemes such as eMBB, URLL, and mMTC.
[0132] In some embodiments, two separate bandpass digital filters are applied to the two bandpasses (BWs). In some embodiments, a high-pass digital filter is applied to the first BW 710 and a low-pass digital filter is applied to the second BW 750. In this embodiment, a protection BW 790 is employed to minimize interference from both BWs 710 and 750; for example, a rejection / transition band is located in BW 790. Furthermore, multiple subcarriers can be semi-statically configured at higher levels to protect BW 790.
[0133] In some embodiments, the OFDM symbol duration includes the cyclic prefix (CP) duration and the duration of the IFFT for the NFFT symbol. The OFDM symbol duration is then determined as the sum of the two durations for CP and IFFT. In some embodiments, the OFDM symbol duration 720 for BW1 710 is configured to be greater than (or an integer (n) multiple) twice the OFDM symbol duration 760 for BW2 750. This is useful when supporting wider coverage of the eMBB segment 560a for operation in BW1 710 than the URL segment 540a for operation in BW2 350.
[0134] Similar to the integer m according to certain embodiments of this disclosure, a specific integer (n) value may be explicitly or implicitly signaled to the UE or a segment (or virtual cell) of the UE. In some embodiments, n equals m, and a single signaling configures these values. In some embodiments, n and m are configured separately. In some embodiments, a UE configured to receive two segments receives a first service (segment) from a first TP and a second service (segment) from a second TP. In this embodiment, the first and second TPs correspond to eNB 530a and small cell 530c, respectively.
[0135] In some embodiments, the first and second TPs correspond to the first eNB 530a and the second eNB 530b, respectively. Other combinations of network devices are also possible to support this operating mode.
[0136] In some embodiments, the CP length 720a configured for BW1 710 is longer than the CP length 720a configured for BW2 750. Note that the longer CP length 720a can cover a wider geographical area than the shorter CP length 720a.
[0137] In some embodiments, the CP length 720a for BW1 710 is the same as the CP length 720a for BW2 750. If the OFDM symbol length 720 is twice the subframe length 760a / b, the total CP overhead of BW1 710 is half the CP length of BW2 750, and therefore BW1 710 is more efficient than segment 2 760 (OFDM symbol duration). In some embodiments, the subcarrier spacing is configured separately for BW1 710 and BW2 750. In this embodiment, the subcarrier spacing is configured such that the subcarrier spacing 770a of BW2 750 is twice as wide (generally, an integer (k) times) the subcarrier spacing 730 of BW1 710.
[0138] Subcarrier spacing refers to the frequency gap between allocated subcarriers. Through subcarrier spacing, OFDM communication systems enable data transmission while maintaining orthogonality among the subcarriers. For example, in the LTE standard, the subcarrier spacing is fixed at 15 kHz.
[0139] Similar to the integers m and n according to certain embodiments of this disclosure, a specific integer (k) value may be explicitly or implicitly signaled to the UE or a segment of the UE (or virtual cell). In some embodiments, n, m, and k are all identical, and a single signal configures these values. In some embodiments, n, m, and k are all configured separately. In some embodiments, the subcarrier spacing values are configured in such a way that the subcarrier spacing 770b of the BW2750 is the same as the subcarrier spacing 730 of the BW1 710.
[0140] Figure 8 Figure 800 illustrates an example of a frame structure for a network supporting multiple services according to an embodiment of the present disclosure. Figure 8 The embodiment of the frame structure for a network supporting multiple services shown in 800 is for illustrative purposes only. Figure 8 One or more components illustrated in 800 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0141] like Figure 8 As shown in 800, the frame structure for a network supporting multiple services 800 includes multiple cells (e.g., fragments, services) 810a, 810b, 810c and multiple cells (e.g., fragments, services) 810d, 820a, 820b, 820c, 820d, 830a, 830b, 830c, 830d, 830e and 830f.
[0142] The number of segments configured in the network can change instantaneously. During the duration of T1, the X MHz BW corresponds to a single serving cell (represented as cell 1) or a single segment (represented as segment 0) 810a, 810c. During the subsequent duration of T2 of T1, in one alternative embodiment, two segments / services / UEs 820a, 820b are frequency-division multiplexed in the BW, and in another alternative embodiment, two segments / services / UEs 820c, 820d are time-division multiplexed. During the subsequent duration of T3 of T2, the X MHz BW again operates as a single serving cell or a single segment 810b, 810d. During the subsequent duration of T4 of T3, in one alternative embodiment, three segments / services / UEs (830a, 830b, and 830c) are frequency-division multiplexed in the BW.
[0143] In some embodiments, fragment / service / UE 1 830d is time-division multiplexed with fragment / service / UE 2 and 3 830e, 830f, and fragment / service / UE 2 and 3 830e and 830f are frequency-division multiplexed. This frame structure provides the flexibility to deploy the network in a time-varying manner to accommodate settings that change over time for traffic types. In this embodiment, the number of fragments configured in the network's BW varies over time. In one embodiment, an X MHz BW includes cells 810a, 810b, 810c, and 810d in time slots T1 and T3. The same BW is partitioned into BWs for two fragments 820a and 820b in time slot T2, and three BWs for three fragments 830a, 830b, and 830c in time slot T4.
[0144] In some embodiments, the control signaling transmitted in cells 1 810a, 810b, 810c, and 810d includes information about the segment identifier and time-frequency resources for the segment located in the next gap. In some embodiments, the network is configured and operates based on a common duration for cell-based operations (i.e., T1=T3). In some embodiments, the network is configured and operates based on a common duration for segment-based operations (i.e., T2=T4), regardless of the number of segments configured.
[0145] In some embodiments, cell-based operations 810a, 810b, 810c, and 810d may also correspond to operations for segments that can be referred to as anchor slices, i.e., operations for segment 0. In some embodiments, the network is configured and operates with periodically recurring cell-based (or anchor slice) operation durations (time-frequency regions). In other words, cell-based operations 810a, 810b, 810c, and 810d, and their previous and future recurrences, occur over a constant time period P (in OFDM symbols, or alternatively in subframes / slots).
[0146] In some embodiments, the cell-based operating areas 810a, 810b, 810c, and 810d include synchronization signals and main broadcast signals (including necessary broadcast information).
[0147] In some embodiments, synchronization signals and main broadcast signals are transmitted in consecutive subsets of X MHz during cell-based operations 810a, 810b, 810c, and 810d (e.g., segment-common PHY channel). In this embodiment, synchronization signals and main broadcast signals are transmitted in a center subband of X MHz. In this embodiment, additional broadcast signals are transmitted in the center subband of X MHz to indicate segment BW allocation in subsequent time slots.
[0148] In some embodiments, the cell-based operating areas 810a, 810b, 810c, and 810d also include a set of UL resources that can be used for UL random access for UL synchronization. In some embodiments, anchor segments are used for control signaling transmission / reception, and non-anchor segments are used for data transmission / reception. In an FDD system, UL and DL anchor segments are configured for the same duration, i.e., T1 and T3 (810a, 810b, 810c, 810d).
[0149] In a TDD system, the temporal resources on which UL anchor segments are configured are positive offsets from the temporal resources on which DL anchor segments are configured. In one example, if a DL anchor is configured in subframe n, then a UL anchor is configured in subframe n+k, where k = 1, 2, 3, 4, ... . The offset number (k) can be explicitly configured in the DCI transmitted within the DL anchor segment, or implicitly configured via the Random Access Channel (RACH).
[0150] In some embodiments, the UE is semi-statically configured with one or more segments (or virtual cells) at higher layers. The UE is further configured to track the time-frequency resources of each configured segment. In this embodiment (segment common control signaling), the UE is configured to receive and process control information transmitted in the cell-based operating area 810a to obtain information about the time-frequency resources of each configured segment. Alternatively, in another embodiment (segment-specific control signaling), the UE is configured to receive and process control information transmitted in the cell-based operating area 810a to obtain information about the time-frequency resources of each configured segment.
[0151] In some embodiments, if the UE is configured with N segments, the UE is configured to process N control signaling messages, where N = 1, 2, ... . These N control signaling messages can be transmitted on Nx Physical Downlink Control Channels (PDCCHs), and their Cyclic Redundancy Check (CRC) is scrambled with segment-specific identifiers (IDs). For example, the CRC of the first control signaling message used for the first segment is scrambled with the first ID, and the CRC of the second control signaling message used for the second segment is scrambled with the second ID, and so on.
[0152] Fragment-common or fragment-specific can be UE-specific or cell-specific signal transmission. In the case of UE-specific signaling, one or more CRCs of one or more xPDCCHs are scrambled with the UE-ID (and one or more fragment-specific IDs or fragment-common IDs).
[0153] In some embodiments, the control information includes at least one of the following parameters: the duration of the next segment-specific frame, i.e., T2; the number of segments configured in T2; a time / frequency partition indication for each configured segment; and mathematical parameters for each (or alternatively, a single) configured segment. The code block to RE mapping method for each configured segment (i.e., according to...) Figure 13 1300 Figure 14 1400 or Figure 15 1500 time-priority or frequency-priority mapping).
[0154] Figure 9 Figure 900 illustrates another example of a frame structure for a network supporting multiple services according to embodiments of the present disclosure. Figure 9 The embodiment of the frame structure for a network supporting multiple services shown in 900 is for illustrative purposes only. Figure 9 One or more components illustrated in 900 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0155] like Figure 9 As shown in 900, the frame structure for a network supporting multiple services includes BW1 910, BW2 950, control (CTRL) 905, 920, 960a, 960b, cell 905b, data frames / subframes / TTI for segment 1 930, and data frames / subframes / TTI for segment 2 970a, 970b.
[0156] In some embodiments, full BW is used for cell 1 during a first duration corresponding to cell-based (or anchor-fragment) control 905a and data frame / subframe / TTI 905b for cell 1. In some embodiments, during the first duration corresponding to 905a and 905b, control signaling is transmitted to instruct the UE to support fragment-specific time-frequency allocations for two of the two BWs 910 and 950.
[0157] Figure 10 Figure 1000 illustrates an example of a self-contained frame structure according to an embodiment of this disclosure. Figure 10 The embodiment of the self-contained frame structure shown in 1000 is for illustrative purposes only. Figure 10 One or more components illustrated in 1000 can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0158] like Figure 10 As shown in Figure 1000, the self-contained frame structure includes multiple subframes 1001 and 1002. Furthermore, subframes 1001 and 1002 include multiple subframes 1015a and 1015b, mSB1 1005a, SB2 1005b, UL ctrl 1040b, multiple DL data 1020a and 1020b, and guard bands (G) 1030a and 1030b. Subframe 1015a refers to the portion of subframes 1001 and 1002 corresponding to SB1 1005a, and subframe 1015b refers to the portion of subframes 1001 and 1002 corresponding to SB2 1005b.
[0159] In some embodiments, SB1 1005a is configured for a first segment (segment 1); and SB2 1005b is configured for a second segment (segment 2). For SB1 1005a, subframe 1005 includes DL data 1020a, a guard gap (1030a), and UL control (1040a). For SB2, in an optional embodiment, subframe 1005 includes DL data 1020b, a guard gap (1030b), and UL control (1040b). For SB2, in an optional embodiment, subframe 1015b includes DL data 1020c and 1020d, a blanking gap (1050), a guard gap (1030b), and UL control (1040b). In some embodiments, the DL data durations 1020a and 1020b may further include a DL PHY control duration 620a / 660a followed by a DL PHY data duration 630a / 670a. Protection gaps 1030a and 1030b are provided to give the UE sufficient time to decode DL data to generate A / N, and timing advance is also applied to send the A / N carried in the UL control gaps (1040a and 1040b).
[0160] In some embodiments, such as Figure 10 As shown in 1001 of 1000, the lengths of the DL data durations 1020a and 1020b can be configured in a fragment-specific manner. Specifically, the lengths of the DL data durations 1020a and 1020b can be configured differently depending on the application (and the fragment) being configured.
[0161] In one such embodiment, the UE allocates two segments: eMBB segment 560a and URLL segment 540a. The PHY signal corresponding to eMBB segment 560a is transmitted / received in SB2 1005b, and the PHY signal corresponding to URLL segment 540a is transmitted / received in SB1 1005a. For SB1 1005a used for URLL segment 540a, a shorter DL data duration is configured, and for SB2 1005b used for eMBB segment 560a, a longer DL data duration is configured. The longer DL data duration improves the spectral efficiency for eMBB segment 560a due to a lower total overhead ratio. The shorter DL data duration reduces the latency of URLL segment 540a.
[0162] For eNB operation, multiplexing of UL reception and DL transmission in the same time resources should be avoided, as it introduces significant interference to UL reception from the LNA (Low Noise Amplifier), caused by the high-power transmitted DL signal, making UL decoding practically impossible. The gap 1050 illustrated in 1002 is useful in preventing this situation. Without the gap 1050, UL control 1040a and DL data 1020b time-conflict, causing the aforementioned problem.
[0163] In some embodiments, the eNB configures its controller such that the blanking gap 1050 is aligned with the UL control gap 1040a, as... Figure 10 1000 shown.
[0164] In some embodiments, the location of the gap 1050 is indicated in control signaling to the serving UE receiving DL data on SB2 1005b. In this case, the UE is aware of the gap 1050, and the UE should assume that the DL modulation symbols are mapped only to those DL data regions of 1020c and 1020d (e.g., excluding the region of gap 1050 within the allocated regions). In other words, the UE should apply a matching rate around the gap 1050 used for DL data reception.
[0165] In some embodiments, the location of the gap 1050 is predefined or configured by a higher layer for a subframe, but the presence of the gap is indicated in control signaling. The control signaling indicating the location or presence of the gap can be transmitted in a dynamic control channel that can be sent in each subframe 1015b. The dynamic control channel can be a dedicated control channel that signals to the UE the allocation by the DL, or a common control channel for a group or all serving UEs.
[0166] In some alternative embodiments, the eNB applies lower-rate channel coding to address data puncturing due to gaps. In this case, the UE is unaware of gap 1050, and the UE assumes that the DL modulation symbols are mapped onto the DL data region of 1020b. This method can be applied when using the RE mapping method illustrated in 1300 and 1500.
[0167] Figure 11A Figure 1100A illustrates an example of a self-contained frame structure having two segments according to an embodiment of the present disclosure. Figure 11A The embodiment of the self-contained frame structure with two segments shown in 1100A is for illustrative purposes only. Figure 11A One or more components illustrated in 1100A may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0168] like Figure 11A As shown in 1100A, the self-contained frame structure 1100A with two segments includes frame 1105A and bandwidth (B) MHz 1110A. Figure 11A In 1100A, the X (horizontal) axis represents time, and the Y (vertical) axis represents frequency. "SF" refers to a subframe within a frame; "DL" represents downlink transmission (eNodeB to UE); "UL" represents uplink transmission (UE to eNodeB); "SRS" refers to the uplink pilot sequence transmitted by the UE; "A / N" refers to the acknowledgment-denial feedback from the UE regarding the successful or failed reception of downlink packets transmitted on the downlink subframe (SF); "PDCCH (Physical Downlink Control Channel)" refers to the control channel; "PDSCH (Physical Downlink Shared Channel)" refers to the data channel; "CRS (Common Reference Signal or Cell-Specific Reference Signal)" refers to the set of pilot reference samples known to all UEs for demodulating the control channel; and "UERS" refers to the set of pilot reference samples used for demodulating a UE-specific PDSCH.
[0169] In some embodiments, time gaps are implemented between DL and UL SF, between UL and DL SF, or between DL SF and subsequent DL SF.
[0170] like Figure 11AAs shown in 1100A, a total bandwidth of B MHz is allocated among K UEs so that each UE can be allocated up to 2 service segments. It will be understood that 2 service segments are exemplary. PDCCH0 is a common control channel interpreted by all UEs; in this embodiment, it may indicate the number of segments and segment boundaries. The location of PDCCH0 is known to all UEs. If the content of PDCCH0 indicates the existence of 2 segments, as in this example, the locations of segment-specific control channels PDCCH1 (for segment #1) and PDCCH2 (for segment #2) will be known to the UEs; PDCCH1 and PDCCH2 are located within the resource allocation corresponding to each segment. A common reference signal (CRS) pilot is used to demodulate PDCCH0, PDCCH1, and PDCCH2.
[0171] In some embodiments, the frame of segment 1 includes a PDCCH1 area followed by an N1 DL SF, followed by a single UL SF including SRS and acknowledgment-denial feedback for packets transmitted in the DL portion of the frame. In another embodiment of the invention, the UL SF including SRS may exist after a DL SF that includes only PDCCH1, or after some other DL SF besides DL SF#N1. PDCCH1 indicates the DL resources allocated to the set of UEs within segment 1 for the entire frame. All UEs allocated DL resources in the frame send back acknowledgment-denial feedback in a UL SF at the end of the frame. A set of UEs, which may be larger than the set of UEs allocated resources in the frame, sends SRS in a UL SF at the end of the frame or in another UL SF in the frame. In some embodiments, SRS transmission occurs before A / N transmission.
[0172] Segment 2 is a set of SFs that begin with a DL SF and end with a UL SF, the DL SF starting from the segment control channel PDCCH2. For each set of such SFs, the control channel PDCCH2 indicates the DL SF allocated to the set of UEs. These sets of UEs send an acknowledgment-denial feedback in the UL SF at the end of the set of SFs. A set of UEs that may be larger than the set of UEs allocated resources in the frame may send SRS in the UL SF at the end of the frame or in another UL SF in the frame. In one embodiment, the SRS transmission occurs before the A / N transmission.
[0173] Figure 11B Figure 1100B illustrates an example of a self-contained frame structure having a single segment according to an embodiment of the present disclosure. Figure 11BThe embodiment with a self-contained frame structure having a single segment shown in FIG1100B is for illustrative purposes only. One or more components illustrated in FIG1100B can be implemented as a dedicated circuit system configured to perform the functions described, or one or more components can be implemented by one or more processors that execute instructions to perform the functions described. Other embodiments may be used without departing from the scope of this disclosure. Figure 11B As shown in 1100B, a self-contained frame structure with a single fragment includes frame 1105B and bandwidth (B) MHz 1110B.
[0174] Figure 11C The 1100C illustration shows another example of a self-contained frame structure having two segments according to an embodiment of the present disclosure. Figure 11C The embodiment of a self-contained frame structure with two segments shown in FIG1100C is for illustrative purposes only. One or more components illustrated in FIG1100C can be implemented as a dedicated circuit system configured to perform the functions described, or one or more components can be implemented by one or more processors that execute instructions to perform the functions described. Other embodiments may be used without departing from the scope of this disclosure. Figure 11C As shown in 1100C, the self-contained frame structure 1100C with a single segment includes frame 1105C and bandwidth (B) MHz 1110C. In some embodiments, the frame structure having only segment 1 and segment 2 operating is... Figure 11B 1100B and Figure 11C As shown in 1100C.
[0175] Figure 12A The 1200A diagram illustrates an example of frame / subframe / TTI composition according to an embodiment of this disclosure. Figure 12A The example of frame / subframe / TTI combination shown in 1200A is for illustrative purposes only. Figure 12A One or more components illustrated in 1200A can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. As shown in Figure 12A1200A, the frame / subframe / TTI combination includes multiple time slots (time slot 0, time slot 1, time slot n-1) 1220a, 1220b, 1220c, multiple RS 1230a, and multiple data 1240a.
[0176] In some embodiments, a subframe or frame or TTI 1200A (corresponding to DL data regions 1020a, 1020b) includes n time slots (1220a, 1220b, 1220c). Each time slot includes multiple reference signal OFDM (RS OFDM) symbols 1230a followed by multiple data OFDM symbols 1240a. This particular allocation method may be beneficial for the UE to obtain channel estimation before data demodulation.
[0177] In some embodiments, the UE may assume that the same precoder is applied across the entire subframe 1210 for channel estimation purposes in RS 1230a. In this embodiment, the UE may interpolate channel estimation across time slots to obtain a better quality channel estimate. In some embodiments, the UE may assume that the precoder is applied to RSa 1230a for each time slot 1220a, 1220b, 1220c. In this embodiment, the UE may not interpolate channel estimation across time slots to obtain a better quality channel estimate.
[0178] In some embodiments, the UE may assume that applying the same precoder across the entire subframe 1210 can be segment-specific; in one such embodiment, this information may be transmitted by control signaling. In one such embodiment, control signaling is transmitted dynamically for each subframe, and the UE assumes changes based on subframe (based on network scheduling decisions).
[0179] In some embodiments, whether the UE can apply the same precoder for a segment across the entire subframe 1210 depends on the subframe duration and / or the frequency location of the segment; in one such embodiment, this information may be transmitted by control signaling.
[0180] Figure 12B Figure 1200B illustrates another example of frame / subframe / TTI composition according to an embodiment of the present disclosure. The embodiment of frame / subframe / TTI composition shown in Figure 12B is for illustrative purposes only. Figure 12B One or more components illustrated in 1200B can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. Figure 12B As shown in 1200B, the frame / subframe / TTI composition includes frequency positions 1210b and 1240b (e.g., frequency subbands, sub-bands), a subframe 1220b for segment A, and multiple subframes 1230b and 1250b (the entire subframe) for segment B.
[0181] In some embodiments, segment A is configured with a subframe duration and frequency position 1210b; while segment B is configured with a subframe duration 1230b and frequency positions 1210b and 1240b. Segments A and B are spatially multiplexed on frequency subband 1210b; while only segment B operates on frequency subband 1240b. In one such embodiment, when a UE is configured to receive on segment A on subband 1210b of both segments spatially multiplexed, the UE assumes that the same precoder is applied across the entire subframe 1220b (e.g., a time slot).
[0182] In one such embodiment, when the UE is configured to receive on segment B on subband 1210b of two segments spatially multiplexed, the UE should not assume that the same precoder is applied across the entire subframe 1230b; instead, the UE may assume that the same precoder is applied across a duration corresponding to the subframe duration of segment A. In this case, the subframe duration of segment A may be equivalent to the slot duration. This per-slot precoder adaptation for segment B can help adapt to certain classes of MU-MIMO precoders, such as SLNR (signal-to-leakage and noise ratio) precoders or ZF (zero-forcing) precoders.
[0183] In one such embodiment, when the UE is configured to receive on segment B on a subband 1240b (e.g., a frequency location) on which only one segment exists, the UE can assume that the same precoder is applied across the entire subframe 1250b. In this embodiment, the UE configured for segment B is notified of the precoding granularity settings for demodulation of each subband, wherein the assumption is for each subband or each subframe; and the UE configured for segment A is notified of the precoding granularity settings for demodulation of each subframe precoding.
[0184] In some embodiments, for segments corresponding to eMMB or with long subframe durations, the UE may not assume that the same precoder is applied across the entire subframe / TTI; however, for segments corresponding to URL or with short subframe / TTI durations, the UE may assume that the same precoder is applied across the entire subframe / TTI 1210 or 1005a, 1005b. This is because the network can perform multi-user precoding on segments with different subframe / TTI durations over the same time-frequency resources.
[0185] In some embodiments, the UE may assume that the same precoder is applied throughout the entire subframe / TTI 1210 by signaling from the network (regardless of the configured segment). This signaling may be provided by higher-layer signaling or by dynamic control signaling. Through dynamic control signaling for each subframe / TTI, the UE assumes that it can be changed based on the subframe / TTI (based on network scheduling decisions).
[0186] The temporal precoding granularity can be configured separately for signaled DMRS ports and interfering DMRS ports. The DCI for scheduling PDSCH can include explicit information on which the UE needs to demodulate the PDSCH for the signaled DMRS ports (port numbers). Interfering DMRS ports (DMRS ports configured other than those for signaled DMRS ports) can be obtained implicitly or explicitly by the UE. Fields in the DCI (or information elements in RRC signaling or on the Media Access Control Frame (MAC CE) control element) can further indicate to the UE what is assumed for the temporal precoding granularity for signaled and interfering DMRS ports.
[0187] Table 1 illustrates an example structure of the indication field (or information element) for the precoding granularity of the indication signal and interference demodulation reference signal (DMRS) ports. When the state is '0', the UE should assume that the precoding granularity for both the signal and interference DMRS ports is per time slot. When the states are '1', '2', and '3', the precoding granularity is interpreted according to the state of the fields in the table.
[0188] Table 1
[0189]
[0190] Table 2 illustrates another example structure of the indication field (or information element) for the precoding granularity of the signal and interference demodulation reference signal (DMRS) ports. When the state is '0', the UE should assume that the precoding granularity for both the signal and interference DMRS ports is per subframe. When the states are '1', '2', and '3', the precoding granularity is interpreted according to the state of the fields in the table. When the precoding granularity is "across multiple subframes (e.g., time slots)," the UE should also be indicated with the identifier of the subframes / time slots for which the UE can assume the same precoding. In one approach, those subframes / time slots correspond to S consecutive subframes / time slots for which the DCI schedules one or more PDSCHs for the UE; the integers S = 1, 2, 3, ... can be configured by the RRC or dynamically notified by signaling in the DCI. In another approach, the temporal precoding granularity is configured by the subframe / time slot period P and the subframe / time slot offset O. The UE may assume that the PDSCH scheduled across subframes / slots {Pk + O + n} applies the same precoding, where for a given integer k, n = 0, 1, ..., P-1.
[0191] Table 2
[0192]
[0193] In some embodiments, multiple transport blocks (TBs) are encoded and mapped to the data area of subframe / frame 1200. Each transport block may be partitioned into multiple code blocks that are separately encoded by a channel encoder (e.g., a 3GPP Turbo encoder, an LDPC encoder, a Reed-Muler encoder, a convolutional encoder, etc.).
[0194] In some embodiments, one (SIMO) or two (MIMO) transport / code blocks are encoded and mapped in each slot of subframe / TTI 1210. In this case, when the subframe / TTI comprises n slots, n or 2n transport / code blocks are mapped in the subframe / TTI. In one embodiment, an A / N is generated for each transport / code block, and the UE is configured to feed back n or 2n A / N bits after decoding the transport / code block. In an alternative embodiment, an A / N is generated for all transport / code blocks, and the decoding results across all transport / code blocks are logically ANDed.
[0195] In some embodiments, each time slot maps an integer number of code blocks, but the total number of transmission blocks in each subframe / TTI 1210 is 1 (e.g., in the case of SIMO transmission) or 2 (e.g., in the case of MIMO transmission).
[0196] Figure 13 Figure 1300 illustrates an example of resource element mapping of data modulation symbols according to an embodiment of the present disclosure. Figure 13 The embodiment of the resource element mapping of data modulation symbols shown in 1300 is for illustrative purposes only. Figure 13 One or more components illustrated in 1300 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0197] like Figure 13 As shown in 1300, the resource element mapping of the data modulation symbol includes time slot 0 1310a, time slot 11310b, multiple RE mapping regions 1320a, 1320b, and 1320c, and data resource element 1330.
[0198] In some embodiments, a transport block includes multiple code blocks. In some embodiments, a time slot includes L OFDM symbols; and a subframe includes T OFDM symbols. In some embodiments, the UE is configured to receive a transport block including multiple code blocks in a subframe / TTI on K subcarriers.
[0199] In some embodiments, the modulation symbols corresponding to the first code block (CB) of the transport block are sequentially mapped on subcarrier 0 to data resource elements 1330 corresponding to OFDM symbols 0, ..., L-1, including time slots (1310a, 1310b), and then mapped on subcarrier 1, etc. As shown in 1320a, where c0, c1, ..., c NCB These are the symbols used in the modulation symbol stream for the first code block. Once the modulation symbols corresponding to the first code block are fully mapped, the modulation symbols corresponding to the second code block of the transport block are sequentially mapped in the next available resource according to this "time-priority mapping". This is illustrated in 1320b, where d0, d1, ..., d NCB These are the symbols used in the modulation symbol stream for the second code block. Once time slot 0 1310a is filled with modulation symbols according to this method, time slot 1 1310b is mapped with modulation symbols according to this time priority mapping. 1320c illustrates the modulation symbol stream {e0, e1, ..., e...} for the third code block. NCB The mapping of}.
[0200] In some embodiments, the UE can still robustly decode transport blocks even if OFDM symbols are erased. This mapping method can be useful for eMBB to cope with accidental OFDM symbol puncturing of eMBB transport blocks, for example, for use with eMBB multiplexing URLL, especially when the eMBB UE does not have very strict latency requirements and has sufficient buffering.
[0201] Figure 14 Figure 1400 illustrates another example of resource element mapping of data modulation symbols according to embodiments of the present disclosure. Figure 14 The embodiment of resource element mapping of data modulation symbols shown in 1400 is for illustrative purposes only. Figure 14 One or more components illustrated in 1400 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0202] like Figure 14 As shown in 1400, the resource element mapping of the data modulation symbol includes time slot 0 1410a, RE mapping region 1420 and data resource element 1430.
[0203] In some embodiments, the modulation symbols {c0, c1, ..., c} corresponding to the first code block NCBThe modulation symbols corresponding to subcarriers 0, ..., K-1 are sequentially mapped on OFDM symbol 0, including the assigned BW, and then mapped on OFDM symbol 2, etc., as shown in 1420. Once the modulation symbols corresponding to the first code block have been fully mapped, the modulation symbols corresponding to the second code block of the transport block are sequentially mapped in the next available resource according to the "frequency-priority mapping" described herein.
[0204] In some embodiments, the UE does not need to buffer most of the received signals. Transport blocks are decoded sequentially and in a timely manner, and once decoding of a transport block is complete, the received signal corresponding to that block can be discarded. In this embodiment, less decoding latency occurs, making it more suitable for URLL-type applications.
[0205] Figure 15 Figure 1500 illustrates yet another example of resource element mapping of data modulation symbols according to embodiments of the present disclosure. Figure 15 The embodiment of the resource element mapping of the data modulation symbol 1500 shown in 1500 is for illustrative purposes only. Figure 15 One or more components illustrated in 1500 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0206] like Figure 15 As shown in 1500, the resource element mapping of the data modulation symbol 1500 includes time slot 0 1510a, multiple RE mapping regions 1520a, 1520b, and data resource element 1530 (e.g., RE).
[0207] In some embodiments, the modulation symbols {c0, c1, ..., c} corresponding to the first code block NCB The process involves sequentially mapping on subcarrier 0 to RE 1530 corresponding to OFDM symbols 0, ..., T-1, including subframe (1510), and then mapping on subcarrier 1, etc. For example... Figure 15 As shown in 1500, once the modulation symbols corresponding to the first code block have been fully mapped, the modulation symbols corresponding to the second code block of the transport block are sequentially mapped in the next available resource according to the "time-priority mapping" described herein. This is illustrated in 1520b.
[0208] In some embodiments, the RE mapping method is fragment-specific, wherein control signaling for transmitting the RE mapping method is sent in cell-based operational (or anchor fragment) areas 810a or 810b. In one such embodiment, the eNB is configured for time-priority mapping (1300 or 1500) for eMBB fragment 560a and frequency-priority mapping (e.g., for URLL fragment 540a) for URL fragment 540a. Figure 14 1400).
[0209] Note that some PHY functions are necessarily segment-common, and some other PHY functions may be segment-specific. In some embodiments, NW (network) planning is segment-specific; that is, different sets of serving cells / sites are configured / utilized for different segments. In some embodiments, a first UE configured with a first segment can transmit / receive on a PHY channel corresponding to a first set of serving cells / sites; and a second UE configured with a second segment can transmit / receive on a PHY channel corresponding to a second set of serving cells / sites. In this embodiment, the network includes network nodes 530a, 530b, 535a, and 535b (e.g., eNBs). The first set of serving cells / sites for the first segment corresponds to 530a and 530b; and the second set of serving cells / sites for the second segment corresponds to 535a and 535b.
[0210] In some embodiments, the UE is configured to transmit / receive on a single segment. In this embodiment, segment-specific transmission / reception occurs within the serving cell configured for the UE. Note that if carrier aggregation is configured for the UE, the number of configured serving cells can be greater than one. In some embodiments, the UE is configured to transmit / receive on multiple segments.
[0211] Figure 16 Figure 1600 illustrates an example of user equipment (UE) operation according to an embodiment of this disclosure, which can be performed by the UE. Figure 16 The UE operation examples shown in 1600 are for illustrative purposes only. Figure 16 One or more components illustrated in 1600 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0212] In some embodiments, in step 1610, the UE first configures a segment at a higher layer. In one such embodiment, the UE is configured with a “default” segment without network intervention (i.e., the UE is manufactured to camp the “default” segment in factory settings). In another such embodiment, in step 1610, a segment already configured by the NW in previous communications is reconfigured as the “default” segment.
[0213] In some embodiments, the default fragment configuration in step 1610 is implicit, in which case the UE is configured to camp on cell-based operation duration / area 810a, 810b, 810c, 810d. Following the “default” fragment configuration in step 1610, in step 1620, the UE is further configured to synchronize with network nodes (or a set of class-coordinated network nodes). For this synchronization operation, the network provides a synchronization signal (SS), which can be divided into a primary SS (PSS) and a secondary SS (SSS). The SS (or PSS / SSS) is used to scramble a scrambling sequence initialized with identifier nID,1.
[0214] Following the synchronization operation in step 1620, in step 1630, the UE is further configured to receive system information. System information can be sent via broadcast signaling. System information can be sent via broadcast signaling in two ways. In the first way, the UE can receive system information called a Master Information Block (MIB) on the Main Broadcast Channel (PBCH), demodulated with the aid of a first reference signal (represented by RS1) on the PBCH. In the second way, the UE can receive system information called a System Information Block (SIB). The SIB is scheduled on the Physical Downlink Channel (PDCH) for physical downlink signals (PHY signals), and its demodulation is also aided by the first reference signal represented by RS1. These PHY signals, PBCH, PDCH, and RS1 are scrambled with their respective scrambling sequences initialized with nID,1.
[0215] In some embodiments, the PDCH includes the Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), etc. Following this is the broadcast signaling operation in step 1630. In step 1640, the UE is further configured to perform UL initial access (or random access procedure). Following the UL initial access in step 1640, in step 1650, the UE may be further configured at a higher layer with one or more fragments for subsequent operations. The higher layer signaling is UE-specific and may be transmitted in the Random Access Response (RAR). In some embodiments, when the UE is configured to operate with the default fragment configured in step 1610, the fragment configuration in step 1650 is omitted.
[0216] Following the segment configuration at step 1650 or the UL initial access at step 1640, the UE is further configured to receive segment-specific PHY resource configuration on the PDCH at step 1660, with PDCH demodulation aided by the second reference signal RS2. These PHY signals PDCH and RS2 are used to scramble their respective scrambling sequences initialized by the scrambling identifier nID,2.
[0217] Following this is the PHY resource configuration in step 1660, where the UE is further configured to transmit and receive on the S-PDCH (fragment-specific PDCH) in step 1670 within the fragment-specific PHY resources. Demodulation of the S-PDCH is aided by a third reference signal (RS3). These PHY signals, the S-PDCH, and RS2 are used to scramble their respective scrambling sequences initialized by the scrambling identifier nID,3. In some embodiments, the broadcast signaling in step 1620 and the fragment-specific PHY resource configuration in step 1660 are transmitted in a subband located at the center of the system BW, where the center subband also includes the DL synchronization signal from step 1620. The UE configured with the fragment is configured to decode fragment-specific information including fragment-specific PHY time-frequency resources during steps 1640 and 1660, and to transmit and receive within the configured fragment-specific PHY time-frequency resources.
[0218] In some embodiments, all three scrambling identifiers, namely nID,1, nID,2, and nID,3, are identical. In one such embodiment, the common scrambling ID corresponds to the physical cell ID. In some embodiments, nID,1 and nID,2 are identical and equal to the physical cell ID; and nID,3 is a fragment-specific ID. In some embodiments, nID,1 equals the physical cell ID; and nID,2 and nID,3 are identical and equal to the fragment-specific ID. In some embodiments, the UE is configured to blindly detect the physical cell ID (in one such embodiment, it is equal to nID,1) during DL synchronization in step 1620.
[0219] In some embodiments, one or more fragment-specific IDs corresponding to one or more NW configuration fragments are indicated by fragment-specific PHY resource configuration in step 1660. In some embodiments, one or more fragment-specific IDs corresponding to one or more NW configuration fragments are indicated by broadcast signaling in step 1630. In some embodiments, the fragment-specific ID is a virtual cell ID whose value is selected from a set of physical cell IDs. In some embodiments, RS1 and RS2 are RS of a first type, and RS3 is RS of a second type. In some embodiments, RS1, RS2, and RS3 are RS of the same type.
[0220] In some embodiments (fragment common access), each UE configured with a fragment is further configured by RRC (or higher-layer signaling) to identify the time / frequency resources and digital parameters of the fragment-specific PHY channel corresponding to the configured fragment. In this embodiment, higher-layer signaling is transmitted in fragment common PHY channels 810a, 810b, 810c, and 810d. During initial access, the UE is configured to utilize the fragment common synchronization procedure and system information acquisition procedure in the fragment common PHY channel in step 1620. In this embodiment, the fragment common synchronization procedure in step 1620 may be a serving cell-based procedure, in which case the synchronization channel sequence is scrambled with a scrambling sequence initialized with the physical cell ID; and the system information acquisition procedure using the broadcast signal in step 1630 is based on the cell-specific reference signal and the main broadcast signal (and the scrambling initialization depends on the physical cell ID).
[0221] In some alternative embodiments (fragment-specific access), each UE configured with a fragment is further configured to first detect a fragment-specific "signature" signal to identify the time / frequency resources and digital parameters of a fragment-specific PHY channel. During initial access, the UE is configured to utilize fragment-specific synchronization procedures and system information acquisition procedures within the fragment-specific PHY channel. Once the UE identifies the time / frequency resources and digital parameters of a fragment-specific PHY channel, the UE is further configured to decode fragment-specific broadcast information including information identifying the time / frequency resources and digital parameters of other fragment-specific PHY channels.
[0222] In some embodiments, the UE receives multiple services (fragments) from a single TP (i.e., eNB 530a, WiFi, or small cell / femto / pico eNB 530c). In this embodiment, the UE uses a common PHY signal for receiving multiple services (fragments). For example, signals providing basic coverage and synchronization can typically be used by the UE to receive / transmit data corresponding to multiple fragments (when a single network node provides multiple services). Such signals may include synchronization signals, a main broadcast signal, and corresponding reference signals (RS). Other RRC configurations and corresponding RSs may be fragment-specific. In this embodiment, the UE is configured to transmit multiple "fragments" in a single serving cell. Certain parameters, including the main information block, are typically applied to those multiple fragments; other parameters can be configured UE-specifically for each fragment. Note that "fragment" is a term used only for convenience in referring to this entity; "fragment" can be named differently, such as virtual cell, supercell, cell, etc.
[0223] Figure 17 Figure 1700 illustrates an example of a frame structure for ultra-reliable and low-latency (URLL) segments according to embodiments of the present disclosure. Figure 17The example of a frame structure for a URLL fragment shown in 1700 is for illustrative purposes only. Figure 17 One or more components illustrated in 1700 can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. Figure 17 As shown in 1700, the frame structure for a URL segment includes multiple subframes (e.g., subframe durations) 1701, 1702, DL control 1710a, self-contained subframes 1710, 1720, 1730, 1740, 1750, guard band 1710c, and control 1710d.
[0224] The latency requirement for URL segment 540a in the PHY may be 1 millisecond. To meet this latency requirement, the duration of a self-contained subframe (including DL control, data, and UL control) should not exceed 1 millisecond. Furthermore, the UE or eNB may sometimes need to wait for a valid subframe boundary, and therefore the subframe duration may even need to be much less than 1 millisecond.
[0225] In some embodiments, the subframe durations 1701 and 1702 on the URL segment 540a are constants less than or equal to 0.5 milliseconds. With this frame structure, the maximum queuing delay for small packets of the UE or eNB is 0.5 milliseconds, and data transmission may occur within the duration of subsequent subframes. Therefore, the resulting PHY delay is less than or equal to 1 millisecond.
[0226] In some embodiments, the subframe durations 1730, 1740, and 1750 on the URL segment 540a are variables less than or equal to 0.5 milliseconds, which may depend on the size of the data packets transmitted in the subframe. In this frame structure, the subframe boundary can be anywhere. A blank duration of 1760 may also be present when the system has no data transmission.
[0227] In these embodiments, a self-contained subframe may include DL control 1710a containing scheduling information for DL / UL data 1710b, DL / UL data 1710b, protection period 1710c, and UL / DL control 1710d which may include A / N for DL / UL data 1710b.
[0228] Figure 18 Figure 1800 illustrates an example of a frame structure for an enhanced mobile broadband (eMBB) segment according to an embodiment of the present disclosure. Figure 18 The embodiment of the frame structure for eMBB segment 1800 shown in 1800 is for illustrative purposes only. Figure 18One or more components illustrated in 1800 can be implemented as a dedicated circuit system configured to perform the said function, or one or more components can be implemented by one or more processors that execute instructions to perform the said function. Other embodiments may be used without departing from the scope of this disclosure. Figure 18 As shown in 1800, the frame structure for the eMBB segment includes multiple subframes 1801 and 1802, DL control 1810 and 1850, guard bands 1830 and 1870, control 1840 and 1880, and multiple data 1860a, 1860b and 1860c for the first, second and third UEs.
[0229] In some embodiments, the self-contained subframe 1801 includes DL control 1810, DL / UL data 1820a, 1820b, and 1820c, protection 1830, and UL / DL control 1840. DL control 1810 can schedule DL / UL data 1820a, 1820b / c of the UE multiplexed in FDM mode. In some embodiments, the self-contained subframe 1802 includes DL control 1850, DL / UL data 1860a, 1860b, and 1860c, protection 1870, and UL / DL control 1880. DL control 1850 can schedule DL / UL data 1860a, 1860b, and 1860c of the UE multiplexed in TDM mode. In this embodiment, DL control 1810 / 1850 can schedule DL / UL data of multiple UEs according to any combination of FDM or TDM. In this embodiment, the UL / DL control 1840 / 1880 includes an A / N corresponding to the decoded UL / DL data of multiple UEs. The A / Ns of multiple UEs can be multiplexed according to any combination of TDM, FDM, or CDM.
[0230] In some embodiments, a frame structure of 1802 is used, and the DL / UL data 1860a, 1860b, and 1860c of multiple UEs are multiplexed in a TDM manner. Then, UL / DL control 1840 / 1880 is also time-division multiplexed to address the situation where data from a third UE is decoded at the last possible moment. In some embodiments, multiple radio access technologies (RATs) coexist in one or more spectrum bands. In one such embodiment, LTE, Wi-Fi, and a new RAT are used by one or more operators on licensed or unlicensed spectrum. In another such embodiment, multiple RATs are configured and used by the network as different technology-specific segments on one or more spectrum bands.
[0231] Figure 19 Figure 1900 illustrates an example of multiple radio access technology (RAT) operation according to an embodiment of this disclosure. The embodiment of multiple RAT operation shown in Figure 1900 is for illustrative purposes only. Figure 19One or more components illustrated in 1900 can be implemented as a dedicated circuit system configured to perform the said function, or one or more components can be implemented by one or more processors that execute instructions to perform the said function. Other embodiments may be used without departing from the scope of this disclosure. Figure 19 As shown in 1900, the multi-RAT operation 1900 includes an LTE-compatible segment 1901, a multi-RAT segment 1902, and a new RAT-compatible segment 1903. Furthermore, the LTE-compatible segment perspective 1901 includes multiple LTE-compatible fields and multiple empty fields 1920. The multi-RAT segment perspective 1902 includes a new RAT field 1930. The new RAT-compatible segment perspective includes an empty field 1940.
[0232] like Figure 19 As shown in Figure 1900, a configuration of multiple RAT segments on two carriers f1 and f2 is illustrated according to certain embodiments of the present invention. Figure 19 In 1900, f1' represents the bound BW of f1+f2. Figure 19 In 1900, "fragment" can be interpreted as "subframe", "frame", or "UE". Multiple LTE-compatible fragments 1910 are configured on f1 and f2, while a single new RAT fragment with a larger bandwidth (new RAT fragment 1930) is configured on f1'.
[0233] In some embodiments, multiple RAT frames (fragments) 1902 can be seen differently by different types of UEs. In one such embodiment, LTE-enabled UEs interpret multiple RAT frames 1902 as LTE-compatible fragments 1901. In some embodiments, UEs that only support the new RAT interpret multiple RAT frames 1902 as new RAT-compatible fragments 1903.
[0234] In some embodiments, an LTE UE configured on a multi-RAT frame 1902 can be configured to continuously detect the presence of a CRS in the LTE-compatible area of 1910. When the CRS is not present in the "empty" area 1920, the UE can skip receiving and assume that no control / data signal or channel is assumed to exist in the empty field 1920.
[0235] In some embodiments, an advanced UE configured on multiple RAT frames 1902 can be configured to receive signals from both the LTE-compatible region 1910 and the new RAT region 1930. In some embodiments, an advanced UE configured on multiple RAT frames 1902 can be configured to receive signals from the new RAT region 1930. Furthermore, the advanced UE can treat the LTE-compatible region 1902 as an "empty" region 1940. In one embodiment, the advanced UE detects the new RAT region 1930 by detecting a "signature" signal different from the LTE CRS.
[0236] In some embodiments, the UE is configured with an LTE-compatible segment 1910 as an "anchor" segment. In some embodiments, the UE is configured with a new RAT segment 1930 as an anchor segment. In some embodiments, the UE is configured with anchor segments for each of the LTE-compatible segment 1910 and the new RAT segment 1930. In this embodiment, the "anchor" segment provides system information for configuration and operation on other segments and can also be used as a "fallback" segment if the connection to other segments is lost or during idle mode periods.
[0237] Licensed Assisted Access (LAA) is an example of an LTE-compatible technology that can coexist with other RATs on the same carrier because it operates with a frame structure consisting of dynamic DL / UL bursts of subframes that conform to the Talk-After-Listen (LBT) protocol.
[0238] In some embodiments, each multi-RAT segment 1902 utilizes the LBT protocol or other distributed spectrum sharing protocols (e.g., carrier-sensing multiple access with collision avoidance (CSMA / CA)) to independently and dynamically access spectrum and coexist with other multi-RAT segments. This can be beneficial for supporting forward compatibility, as it allows the introduction of new PHY segments for different RATs without requiring backward compatibility with other segments, or the introduction of additional configuration signaling that older devices might not be able to utilize.
[0239] In some embodiments, the multiple RAT segments 1902 are configured and scheduled by one or more network entities (e.g., eNBs or multiple RAT controllers). The ratio of time / frequency resources configured for each segment (e.g., TDM / FDM mode) and used can be determined based on service requirements (e.g., eMBB or URLL), traffic volume or coverage requirements associated with each segment, and exchanged across one or more operator network entities. This can be beneficial for supporting efficient reuse of segments.
[0240] In some embodiments, different segments are frequency-division multiplexed, with guard bands for DL / UL subframes to avoid time overlap. Specifically, the new RAT segment 1930 operates on a larger bandwidth (f1') than any of the LTE-compatible PHY segments (f1 and f2) 1910. In this case, coordination between the configurations of the different segments helps avoid unnecessarily large "empty" periods. In this embodiment, a TDM / FDM mode is established between multiple RAT segments, which includes certain fixed or semi-statically configured resources for each segment and / or period, where resources are flexibly allocated among segments of different RATs.
[0241] In some embodiments, the availability of one or more multi-RAT segments is indicated by broadcast information; or alternatively, a given UE is pre-configured based on device performance or service profiles. In one such embodiment, the UE requests configuration of one or more multi-RAT segments upon initial connection to an anchor segment or upon initiation of one or more services associated with the segment. In this embodiment, where different segments are associated with multiple operators, operator identifiers (e.g., Public Land Mobile Network (PLMN)) may also be indicated as part of the segment configuration signaling process.
[0242] 5G supports a wide variety of spectrums and a wide variety of services and devices. The 5G air interface needs to support scalable OFDM digitization to meet various deployment scenarios. Examples of OFDM digitization include at least one of the following: subcarrier spacing, cyclic prefix (CP) length, or the number of OFDM symbols in a single SF. This disclosure discloses corresponding PHY designs for multiple OFDM digitizations.
[0243] A radio system can allow more than one OFDM digitizer for different types of transmissions. Depending on the configured OFDM digitizer, the UE procedures can be configured accordingly. In a radio system, an eNB can form multiple Total Radiated Power (TRPs) as a group, called a TRP group (TRPG). Each TRPG can have a TRPG ID. Within a TRPG, there is no Radio Resource Control (RRC) signaling required for mobility, but some RRC reconfiguration exists for mobility between TRPGs.
[0244] In some embodiments, the OFDM digital configuration may include at least some of the following: the subcarrier spacing of the OFDM; the length of the OFDM symbol and the length of the cyclic prefix (CP); the bandwidth for initial access signal transmission; and the number of OFDM symbols in a subframe and the length of a subframe.
[0245] In some embodiments, a default OFDM digitization configuration is used for initial access signal (IS) transmission. In this embodiment, the UE is configured to detect the initial access signal using the default OFDM digitization. An example of the default digitization is a subcarrier spacing of 15 kHz (and / or a bandwidth of 1.4 MHz).
[0246] In some embodiments, the default OFDM digitization is the minimum subcarrier spacing (and / or maximum OFDM symbol length) supported by the system on a particular carrier frequency. In some embodiments, the default OFDM digitization is a specific digitization that can typically be applied to a UE accessing all carrier frequency bands known to both the eNB and the UE.
[0247] In some embodiments, the default OFDM digits are determined as a function of integers determined by the carrier frequency. In this embodiment, the UE utilizes one or more carrier frequencies to derive the default OFDM digits, as shown in Table 3. The carrier frequencies in Table 3 correspond to representative carrier frequencies near the numbers shown in the entries. For example, 2 GHz in the entry means carrier frequencies near 2 GHz, such as 2.1 GHz, 1.9 GHz, etc.
[0248] Table 3
[0249]
[0250] In some embodiments, the subcarrier spacing (and / or bandwidth) is scaled accordingly based on the typical available bandwidth in the respective carrier frequency. In some embodiments, the UE configures default digitization at a higher layer.
[0251] In some embodiments, the UE is configured in time-frequency resources (e.g., periodically recurring subframes) using the default OFDM digitization. In one example, the UE detects an initial access signal, including synchronization signals and / or broadcast signals, etc. In this example, the UE may identify the OFDM index and / or the number of subframes (or the index of time slot X) and the timing from some initial access signal. In another example, the UE may be configured with alternative OFDM digitization to externally use the default digitization time-frequency resources. In yet another example, the UE performs rate matching with xPDSCH / xPUSCH around the initial access signal resources. In yet another example, the UE measures a measurement RS for RRM measurements during the initial access procedure. In this embodiment, one or more of the following may be mapped to the time-frequency resources using the default digitization: the initial access signal; xPDSCH transmitting an alternative OFDM digitization configuration (which may be broadcast signaling or UE-specific signaling); xPDSCH / xPUSCH; and the measurement RS for RRM measurements.
[0252] Figure 20 The figure 2000 illustrates an example of default OFDM digitization in frequency division multiplexing (FDM) according to an embodiment of the present disclosure. Figure 20 The embodiment of default OFDM digitization in FDM shown in 2000 is for illustrative purposes only. Figure 20 One or more components illustrated in the 2000 diagram may be implemented as a dedicated circuit system configured to perform the functions described herein, or one or more components may be implemented by one or more processors that execute instructions to perform the functions described herein. Other embodiments may be used without departing from the scope of this disclosure. Figure 20As shown in Figure 2000, the default OFDM digitization in Frequency Division Multiplexing (FDM) includes alternative OFDM digitization 2001 and default OFDM digitization 2002. Default OFDM digitization 2002 includes OFDM symbol length 2021 and subcarrier spacing 2022. Alternative OFDM digitization 2001 includes OFDM symbol length 2011 and subcarrier spacing 2012.
[0253] In some embodiments, alternative OFDM digitization is signaled on the initial access signal or on other broadcast channels using the default OFDM digitization. In the FDM example, in Figure 20 The default OFDM digits and alternative OFDM digits in the same time slot are shown in 2000.
[0254] like Figure 20 As shown in Figure 2000, the alternative OFDM digitization 2001 has an OFDM symbol length of 2011 and a subcarrier spacing of 2012, while the default OFDM digitization 2002 has an OFDM symbol length of 2021 and a subcarrier spacing of 2022. Figure 20 In OFDM 2000, the subcarrier spacing 2022 of OFDM 2002 is half that of OFDM 2001. Furthermore, the OFDM symbol length 2021 of OFDM 2002 is twice that of OFDM 2001.
[0255] In some embodiments, default digitization is used for the initial access signal transmitted in a subband within a time slot, and alternative digitization is used for other subbands within the same time slot, such as... Figure 20 As shown in Figure 2000, a guard band can be inserted between a subband using the initial access signal with the default OFDM digitization and a subband using other signals with different OFDM digitizations. The size of the guard band can be configured by the upper layer via RRC messages.
[0256] The alternative OFDM digits may be the same as or different from the default OFDM digits used for initial access signal transmission. In some embodiments, the UE is configured to receive a signal generated with the default digits in a subband on which the initial access signal is mapped. On the other hand, when the UE is configured with alternative digits, the UE is further configured to receive a signal generated with the alternative digits outside that subband.
[0257] In some embodiments, the Physical Cell ID (PCID) or a new ID defined in the NR (e.g., TRPG ID, Supercell ID, or Cell ID) is inferred from the detected synchronization signal. In this disclosure, this ID is referred to as ID X.
[0258] In some embodiments, the alternative OFDM digits are indicated by an implicit or explicit signaling scheme during the initial access procedure. In one example, the alternative OFDM digits are implicitly indicated by the value of ID X. For this purpose, ID X is partitioned into several groups. Each group corresponds to an alternative OFDM digit configuration. The UE is configured to first decode ID X from the initial access signal and then derive the alternative OFDM digit configuration depending on which group ID X belongs to. In another example of joint encoding with ID X, both the alternative OFDM digit information (which may be several bits, e.g., 1 or 2 bits) and ID X are inferred from the sequence ID of the initial access signal. In yet another example, regarding several bits of the MIB on the xPBCH, two bits of the MIB on the xPBCH indicate the value of the alternative OFDM digit configuration. Bit value 00 indicates value #1 for the alternative OFDM digit, bit value 01 indicates value #2 for the alternative OFDM digit, bit value 10 indicates value #3 for the alternative OFDM digit, and bit value 11 indicates value #4 for the alternative OFDM digit.
[0259] In another example of the implicit indication of the time-frequency resource location via a specific initial access signal, the UE can detect the specific initial access signal to determine an alternative OFDM digit. In this example, a first synchronization signal is mapped onto a first subcarrier index (e.g., the center subcarrier of an NR carrier), and the first synchronization signal is used to obtain synchronization near the subcarrier corresponding to the first subcarrier index. A second synchronization signal should be set on a second subcarrier index as an offset different from the first subcarrier index, and the offset value can be selected from, for example, one of four candidate values. One example is that the subcarrier index of the second synchronization signal is given by an equation, for example, ki = kc + Δki, where i∈{0, 1, 2, 3} corresponds to the specific alternative digit.
[0260] Figure 21 Figure 2100 illustrates the subcarrier index of a first synchronization signal according to an embodiment of the present disclosure. Figure 21 The embodiment of the subcarrier index of the first synchronization signal shown in 2100 is for illustrative purposes only. Figure 21 One or more components illustrated in 2100 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0261] like Figure 21As shown in 2100, the subcarrier index of the first synchronization signal includes multiple frequency positions (subcarrier positions). The first synchronization signal is mapped onto a subcarrier mapping corresponding to frequency position 2111. The second synchronization signal has four frequency positions 2121, 2122, 2123, and 2124 corresponding to four different subcarrier offset values Δki. Each subcarrier position of 2121, 2122, 2123, and 2124 corresponds to an alternative OFDM digit index. The UE is configured to detect the second synchronization signal and then identify the alternative OFDM digits based on the subcarrier index of the second synchronization signal.
[0262] Figure 22 Figure 2200 illustrates the subcarrier index of a second synchronization signal according to an embodiment of the present disclosure. Figure 22 The embodiment of the subcarrier index of the second synchronization signal shown in 2200 is for illustrative purposes only. Figure 22 One or more components illustrated in 2200 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0263] like Figure 22 As shown in 2200, the subcarrier index of the second synchronization signal includes multiple time-frequency resource locations 2211, 2221, 2222, 2223, and 2224. In one example, the first synchronization signal is mapped onto a first time-frequency resource and used to obtain synchronization of the NR carrier. The second synchronization is mapped to a second time-frequency mapping mode. This mode can be selected from, for example, one of four time-frequency modes, and each mode index corresponds to a specific alternative OFDM digitization.
[0264] like Figure 22 As shown in 2200, one example is that the subcarrier index of the second synchronization signal on OFDM symbol 1 is given by an equation, for example, ki (1) = kc + Δki (1), where i∈{0, 1, 2, 3} corresponds to a specific alternative number. Figure 22 As shown in 2200, the first synchronization signal is mapped onto time-frequency resource 2211. The second synchronization signal has four selectable time-frequency resource locations 2221, 2222, 2223, and 2224. Each time-frequency pattern of 2221, 2222, 2223, and 2224 corresponds to a specific alternative OFDM digit. The UE is configured to detect the second synchronization signal and then identify the alternative OFDM digit based on the time-frequency mapping pattern of the second synchronization signal.
[0265] In some embodiments of xSIB, two bits of the xSIB transmitted over the physical channel are generated according to the default OFDM digitization. In this embodiment, the value of these two bits indicates the alternative OFDM digitization.
[0266] In some embodiments, a bit of information indicating whether the alternative OFDM digits are the same as the default OFDM digits is provided by ID X or a sequence ID on the initial access signal or xPBCH. If the value of this bit indicates that the alternative OFDM digits are different from the default OFDM digits, the UE is configured to further decode two bits from either the xPBCH (if the sequence ID is used for a one-bit indication) or the xSIB (if the PBCH carries a one-bit information) transmitted with the default OFDM digits, and these two bits indicate the alternative OFDM digits. In some embodiments, the alternative digits are UE-specifically configured via RRC signaling.
[0267] Figure 23 Figure 2300 illustrates an example of default digitization on a subband according to an embodiment of this disclosure. Figure 23 The example of default digitization on the subband shown in 2300 is for illustrative purposes only. Figure 23 One or more components illustrated in 2300 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0268] like Figure 23 As shown in 2300, the default digitization on the subband includes frequency resources 2305 for the initial access signal and time resources 2310 for the initial access signal.
[0269] In some embodiments, the UE is configured to receive certain broadcast and / or multicast transmissions using alternative OFDM digitization, such as xPDCCH and / or xPDSCH carrying information to be received by a group of UEs including the UE. The UE may be configured to use alternative OFDM digitization to transmit uplink access signals, such as xPRACH signals.
[0270] In some embodiments, the frame structure is designed for the transmission of an initial access signal with a default OFDM digitization configuration. The time slot for mapping the initial access signal is called the initial access time slot (which can be a unit of time slot X or a subframe). The time-frequency resources for mapping the initial access signal utilize the default OFDM digitization configuration, and a UE is configured to use the default OFDM digitization to detect the initial access signal. The time slot for not mapping the initial access signal is called the normal time slot. An alternative digitization is used in the normal time slot.
[0271] The time-frequency resources on which the default digits are used can be explicitly or implicitly configured to the UE. In some embodiments, the default digits are used in at least those subbands on which the initial access signal is mapped across all time slots, unless otherwise explicitly configured. Figure 23 As shown in 2300, the initial access signal is transmitted in time slot P during subframes (time slots) n and n+P of subband (SB) K. In this case, the UE can assume that the default digitization is used in SB K in all subframes unless otherwise configured.
[0272] Figure 24 Figure 2400 illustrates an example of digitization on a sub-band according to an embodiment of this disclosure. Figure 24 The embodiments of digitization on subbands shown in 2400 are for illustrative purposes only. Figure 24 The embodiments of the subband numerics shown in 2400 are for illustrative purposes only. Figure 24 One or more components illustrated in 2400 may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0273] like Figure 24 As shown in 2400, the digitization on the sub-band includes a time slot 2410 with an initial access signal and a time slot 2420 without an initial access signal. In some embodiments, a default digitization is used on at least these time slots (across the system BW of the configured NR carrier) on which the initial access signal is mapped, such as... Figure 24 As shown in 2400.
[0274] In some embodiments, multiple time slots are configured with initial access signals, while other time slots are not configured with initial access signals. For example... Figure 24 As shown in 2400, time slots n1, n2 (in some embodiments = n+P), ..., (e.g., 2410) are configured with an initial access signal, while other time slots are not configured with an initial access signal 2420. In time slot 2410 with an initial access signal, the UE is configured to detect the initial access signal using default digits. In time slot 2420 without an initial access signal, the UE can be configured to receive / transmit signals using alternative digits.
[0275] In some embodiments, during the initial access time slot, time-frequency resources for the initial access signal (including synchronization signals, xPBCH for MIB, and ePBCH for SIB, etc.) are generated using a default OFDM digitization configuration, and the UE is configured to detect the initial access signal using the default OFDM digitization. In some embodiments, the initial access signal is mapped across all OFDM symbols during the initial access time slot. In some embodiments, time-frequency resources in the initial access time slot not used by the initial access signal can be used to transmit other signals, such as xPDCCH and xPDSCH.
[0276] Figure 25A The 2500A diagram illustrates an example of time and frequency resources for initial access according to an embodiment of this disclosure. Figure 25A The embodiment of time and frequency resources for initial access shown in 2500A is for illustrative purposes only. Figure 25A One or more components illustrated in the 2500A may be implemented as a dedicated circuit system configured to perform the functions, or one or more components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure.
[0277] like Figure 25A As shown in 2500A, the time-frequency resources used for initial access to 2500A include non-initial access resources / signals 2510 and initial access resources / signals 2520. In some embodiments, all time-frequency resources in the initial access time slot (subframe) are constructed using default OFDM digitization (so-called OFDM digitization A), as follows: Figure 25A As shown in Figure 2500A, all time-frequency resources and signals in the initial access subframe are constructed using OFDM digitization A (non-initial access resources / signals 2510 and initial access resources / signals 2520). In this case, the UE is configured to detect the initial access signal according to the default OFDM digitization. The time-frequency resource 2510, which does not map the initial access signal, can be used for the transmission of other signals, such as xPDCCH and xPDSCH.
[0278] Figure 25B The 2500B diagram illustrates another example of time and frequency resources for initial access according to an embodiment of this disclosure. Figure 25B The embodiment of time and frequency resources for initial access shown in Figure 2500B is for illustrative purposes only. One or more components illustrated in Figure 2500B can be implemented as a dedicated circuit system configured to perform the functions described, or one or more components can be implemented by one or more processors that execute instructions to perform the functions described. Other embodiments may be used without departing from the scope of this disclosure.
[0279] like Figure 25B As shown in 2500B, the time-frequency resources for initial access include resource elements 2540 constructed in OFDM digitization B and guard bands 2530. In some embodiments, the subband signals used to generate the initial access signal in the initial access time slot (subframe) are constructed using default OFDM digitization, and the signals mapped outside the subband can be constructed using alternative OFDM digitization (so-called OFDM digitization B), such as... Figure 25B As shown in 2500B.
[0280] If the system bandwidth is greater than the subband size of the initial access signal, the other subbands can be used for the transmission of other signals, such as xPDCCH and xPDSCH, utilizing alternative OFDM digitization. Guard band 2530 can be inserted between the subbands of the initial access signal using the default OFDM digitization and the subbands used for other signals using other OFDM digitization. The size of the guard band can be configured by the upper layer via RRC messages.
[0281] Figure 25C The 2500C diagram illustrates example time and frequency resources for a physical downlink channel and a synchronization signal for initial access, according to embodiments of the present disclosure. Figure 25C The embodiments shown in 2500C for time and frequency resources for physical downlink channels are for illustrative purposes only. Figure 25C One or more components illustrated in the 2500C may be implemented as a dedicated circuit system configured to perform the functions described herein, or one or more components may be implemented by one or more processors that execute instructions to perform the functions described herein. Other embodiments may be used without departing from the scope of this disclosure.
[0282] In some embodiments, to enable simultaneous reception of an initial access signal using the default OFDM digitizer and other signals using another OFDM digitizer in the initial access subframe, the UE is configured to process two different OFDM digitizers simultaneously.
[0283] In some embodiments, the time interval for transmitting the initial access signal is shorter than the entire duration of the initial access time interval, such as... Figure 25C As shown in 2500C. The initial access signal is transmitted in a subband within several consecutive OFDM symbols (in terms of the default OFDM digitization) during the initial access time gap (subframe). All other time and frequency resources can be used to utilize another OFDM digitization, for example, other signals that replace the OFDM digitization, such as xPDCCH and xPDSCH transmissions. A guard band 2530 is inserted only on the OFDM symbol in which the initial access signal is transmitted.
[0284] Signaling can be introduced to allow a UE to identify the set and / or number of time-frequency resources available for data and control information reception / transmission and the OFDM digits used during the initial access time slot (subframe); the UE is then configured to perform rate matching for data / control signal transmission accordingly during the access time slot (subframe). In some embodiments, signaling facilitating a UE's reception / transmission (or informing a UE of the area of the initial access signal and the OFDM digits used for the available time-frequency resources) can be transmitted according to the following example schemes: on the System Information Block (SIB); on the Master Information Block (MIB) on the xPBCH; jointly encoded with other information, such as the Physical Cell ID, the number of OFDM symbols, and the initial access signal sequence; via an RRC message; and via Dynamic Downlink Control Information (DCI) signaling on the xPDCH. In one example of dynamic DCI signaling, the DCI indication sent instead of the OFDM digits is used for the OFDM digits of the xPDSCH scheduled by a DCI.
[0285] In some embodiments, a UE may be configured with one or more alternative OFDM digitization configurations. This configuration may be signaled by an upper layer, for example, via an RRC message. The configuration may be UE-specific. It may depend on UE performance or UE category and type. An example is a UE configured with different digitizations for PCell and SCell in the case of carrier aggregation. In some embodiments, one digitization configuration is used for latency-tolerant services, while another is used for latency-sensitive services.
[0286] In some embodiments, several bits in the RRC message explicitly indicate to a UE the value of the secondary OFDM digitization configuration. The secondary OFDM digitization configuration can be configured for a service class and / or a component carrier. In some embodiments, several bits in the dynamic DCI signaling on the xPDCCH transmitted by the alternative OFDM digitization indicate the secondary OFDM digitization used for a data transmission scheduled by the xPDCCH. In some embodiments, several bits in the dynamic DCI signaling on the xPDCCH indicate the secondary OFDM digitization that should be used during a specific time period. In some embodiments, the alternative and secondary digitization configurations are used for signal transmissions other than the initial access signal, such as for transmissions of the xPDCCH, xPDSCH, and xPhysical Uplink Shared Channel (xPUSCH).
[0287] In some embodiments, for antenna port Each element in the resource raster is called a resource element and is indexed by a time slot (time gap). Uniquely identified, among which, and These are the indices in the frequency domain and time domain, respectively. Antenna port. resource elements on Corresponding to complex values .
[0288] In some embodiments, a resource grid is defined for each configured OFDM digitization. In one example, the antenna port... resource elements on And the corresponding resource raster for the default numerical definition. In another example, the antenna port resource elements on And the corresponding resource raster for the alternative digital definition.
[0289] When the subcarrier spacing of the alternative numerator is α times the subcarrier spacing of the default numerator (α = 1, 2, 4, 8, ..., ½, ¼, 1 / 8, ...), the index and The range is determined based on default numerology. and In one example, alternative numerology is... and Confirmed. In another example, alternative numerology is... and Sure.
[0290] In this example, the index identifiers from two resource rasters have the default numeric values on the resource rasters. Corresponding to resource rasters with alternative digitization In this example, the resource raster with default numerology... Corresponding to resource rasters with alternative digitization .
[0291] In some embodiments, the index identifiers from two resource rasters have a default numeric value in the resource raster. Corresponding to resource rasters with alternative digitization In this embodiment, the resource raster with default numeric values... Corresponding to resource rasters with alternative digitization .
[0292] Figure 26A Figure 2600A illustrates an example of a resource index according to an embodiment of this disclosure. Figure 26A The example of the resource index shown in 2600A is for illustrative purposes only. Figure 26AOne or more components illustrated in 2600A can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. Figure 26A As shown in 2600A, the resource index includes frequency (e.g., subcarrier) 2605A and time (e.g., OFDM symbol) 2610A.
[0293] Figure 26B 2600B describes another example of a resource index according to embodiments of the present disclosure. Figure 26B The resource indexing examples shown in 2600B are for illustrative purposes only. Figure 26B One or more components illustrated in 2600B can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. Figure 26B As shown in 2600B, the resource index includes frequency (e.g., subcarrier) 2605B and time (e.g., OFDM symbol) 2610B.
[0294] Figure 26A 2600A and Figure 26B 2600B describes the resource indexes of two resource rasters corresponding to the default and alternative numeric codes according to this embodiment. Figure 26A 2600A and Figure 26B In 2600B, assume α = 1, 2, 4, 8, ... (i.e., α ≥ 1). Specifically, Figure 26A 2600A indicates a case where the default digitization has a narrower subcarrier spacing than the replacement digitization. Similarly, Figure 26B 2600B describes a scenario where the default digitization has a wider subcarrier spacing than the alternative digitization. In these... Figure 26A In 2600A and 26B, the shaded box corresponds to the resource element in the resource raster used for the default numerics and the white box corresponds to the resource element in the resource raster used for the alternative numerics.
[0295] The UE uses the default digitization to obtain the resource element index from the initial access signal (e.g., synchronization channel) on the resource grid. When the UE is also configured with an alternative digital time, the UE obtains the time and frequency resource index. .
[0296] In some embodiments, in the case of subframe / slot aggregation (i.e., TTI spanning more than one time slot X), DMRS is mapped onto a subset of subframes / slots (or time slots) in a PDSCH subframe / slot aggregation (aggregation of multiple time slots X) that includes multiple subframes / slots. For example, DMRS is mapped only to the first subframe / slot (time slot X) of the aggregation.
[0297] Figure 27 Figure 2700 illustrates a reference signal (RS) mapping in subframe / slot aggregation according to an embodiment of the present disclosure. Figure 27 The example of RS mapping in the subframe shown in 2700 is for illustrative purposes only. Figure 27 One or more components illustrated in 2700 can be implemented as a dedicated circuit system configured to perform the functions, or one or more components can be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of this disclosure. Figure 27 As shown in 2700, the RS mapping in the subframe aggregation includes DL control 2701, multiple DL eMBB data 2710, gap 12720, UL control 2730 and DMRS 2740.
[0298] like Figure 27 As shown in Figure 2700, a frame structure is illustrated where DMRS is mapped only in one aggregated subframe / slot (time slot X). The UE is configured with an aggregation comprising N consecutive SF / slots. The value of N is >= 1. An example is for eMBB service, where a frame structure comprising multiple subframes / slots increases transmission efficiency by reducing total overhead.
[0299] like Figure 27 As shown in 2700, SF / slot n includes DL Ctrl 2701 and DL data 2710. SF / slot n+N-1 includes DL data 2710, gap GAP1 2720 for DL and UL transmission, and UL Ctrl 2730. SF / slot n+1 to n+N-2 include DL data 2710. In some embodiments, DMRS 2740 for DL data transmission is mapped only in SF n. Transmission of DMRS 2740 can be configured by DL Ctrl 2701. Transmission of DMRS 2740 can be configured by the upper layer via certain RRC messages. Mapping DMRS in SF / slot n in subframe / slot aggregation enables the decoding of DL data 2710 to begin as soon as possible. In some embodiments, DMRS 2740 is mapped in any one or some of SF n to n+N-1.
[0300] Signaling can be designed to allow the UE to identify the DMRS2740 mapping in the case of subframe / timeslot (time slot) aggregation. Table 4 shows the 1-bit signaling configuration used for DMRS mapping.
[0301] Table 4
[0302]
[0303] Table 5 provides an example of a 2-bit signaling configuration for DMRS mapping.
[0304] Table 5
[0305]
[0306] In some embodiments, bn = 1 indicates that DMRS is mapped in time slot n, while bn = 0 indicates that DMRS is not mapped in time slot n. In some embodiments, the bitmap is separately signaled in higher layers. In some embodiments, when DMRS is not mapped in time slot x, the corresponding DMRS RE is used for xPDSCH mapping.
[0307] In some embodiments, DMRS mapping information may be transmitted. In one example, DMRS mapping information may be transmitted via RRC signaling to inform the UE of the method for mapping DMRS in the case of subframe / slot aggregation. In one example, DMRS mapping information may be transmitted over System Information (SIB). In yet another example, DMRS mapping information may be transmitted in DL Ctrl via Dynamic DCI signaling. In this example, the information may include which one or more subframes / slots the DMRS is mapped to. In yet another example, the DMRS mapping configuration is UE-specific. The UE may derive the DMRS mapping based on certain UE information, such as the UE ID. In yet another example, the DMRS mapping configuration is service-specific. The UE may derive the DMRS mapping based on the type of scheduled service. In yet another example, the DMRS mapping configuration is allocation-specific. The UE may derive the DMRS mapping based on allocation information, such as the number of allocated OFDM symbols.
[0308] While this disclosure has been described with reference to exemplary embodiments, various changes and modifications may be made to those skilled in the art. This disclosure is intended to include such changes and modifications that fall within the scope of the appended claims.
[0309] The methods described in the claims and / or specification according to various embodiments can be implemented by hardware, software, or a combination of hardware and software.
[0310] In the implementation of the software, a computer-readable storage medium may be provided for storing one or more programs (software modules). The one or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within an electronic device. At least one program may include instructions causing the electronic device to perform methods as defined in the appended claims and / or as disclosed herein according to various embodiments of this disclosure.
[0311] The program (software module or software) can be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), disk storage devices, compact disc-ROM (CD-ROM), digital multipurpose disc (DVD), or other types of optical storage devices or magnetic tape cassettes. Alternatively, any combination of some or all of the above can form the memory in which the program is stored. Furthermore, multiple such memories can be included in an electronic device.
[0312] Additionally, the program can be stored in an attachable storage device that can be accessed by an electronic device via a communication network, such as the Internet, intranet, local area network (LAN), wide LAN (WLAN), and storage area network (SAN), or a combination thereof. Such a storage device can be accessed via an external port to an electronic device executing embodiments of this disclosure. Furthermore, a separate storage device on the communication network can be accessed to a device executing embodiments of this disclosure.
[0313] In the specific embodiments of this disclosure described above, the components included in this disclosure are represented in a singular or plural form according to the specific embodiments. However, the singular or plural form is chosen for the convenience of description suitable for the present situation, and the various embodiments of this disclosure are not limited to a single element or multiple elements. In addition, any of the multiple elements represented in the description can be configured as a single element, or a single element in the description can be configured as multiple elements.
[0314] While embodiments have been described in the detailed description of this disclosure, this disclosure can be modified in various forms without departing from its scope. Therefore, the scope of this disclosure should not be defined as limited to the embodiments, but should be defined by the appended claims and their equivalents.
Claims
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: Based on the default subcarrier spacing, the access signal received from the base station (BS) includes synchronization signals and broadcast signals for the main information block (MIB). as well as Based on the access signal, information associated with the first subcarrier interval used for random access is obtained; The configuration information for receiving bandwidth from the BS includes: Information about frequency resources for bandwidth, and Information regarding the second subcarrier spacing of the bandwidth; as well as Send or receive signals based on the configuration information.
2. The method of claim 1, wherein the configuration information further includes the length of the cyclic prefix (CP).
3. The method of claim 1, further comprising: The BS receives a demodulation reference signal for broadcast signals, which is scrambled using Physical Cell Identity (PCID). The configuration information is received based on Radio Resource Control (RRC) signaling.
4. The method of claim 1, wherein, The default subcarrier spacing is determined based on the frequency range.
5. The method of claim 1, further comprising: Uplink access signals are transmitted to the BS based on the subcarrier spacing configured by the System Information Block (SIB).
6. The method of claim 1, further comprising: Receive downlink signals from the BS on resources not used by the access signals.
7. A user equipment (UE) in a wireless communication system, the UE comprising: Transceiver, and The processor, operatively coupled to the transceiver and configured as follows: Based on the default subcarrier spacing, access signals, including synchronization signals and broadcast signals for the Master Information Block (MIB), are received from the base station (BS). Based on the access signal, information associated with the first subcarrier interval used for random access is obtained. The configuration information for receiving bandwidth from the BS includes: Information about frequency resources for bandwidth, and Information regarding the second subcarrier spacing of the bandwidth, and Send or receive signals based on the configuration information.
8. The UE as described in claim 7, wherein the configuration information further includes the length of the cyclic prefix (CP).
9. The UE of claim 7, wherein the transceiver is further configured to: The BS receives a demodulation reference signal for broadcast signals, which is scrambled using Physical Cell Identity (PCID). The configuration information is received based on Radio Resource Control (RRC) signaling.
10. The UE of claim 7, wherein the default subcarrier spacing is determined based on the frequency range.
11. The UE as claimed in claim 7, wherein, The transceiver is also configured to: Uplink access signals are transmitted to the BS based on the subcarrier spacing configured by the System Information Block (SIB).
12. The UE as claimed in claim 7, wherein, The processor is also configured to: Receive downlink signals on resources not used by the access signals.
13. A base station (BS) in a wireless communication system, the BS comprising: Transceiver, and The processor, operatively coupled to the transceiver and configured as follows: Based on the default subcarrier spacing, an access signal is sent to the user equipment (UE) including a synchronization signal and a broadcast signal for the master information block (MIB). Based on the access signal, information associated with the first subcarrier interval used for random access is provided. Send bandwidth configuration information to the UE, the configuration information including: Information about frequency resources for bandwidth, and Information regarding the second subcarrier spacing of the bandwidth, and Send or receive signals based on the configuration information.
14. The BS of claim 13, wherein the configuration information further includes the length of the cyclic prefix (CP).
15. The BS of claim 13, wherein the transceiver is further configured to: A demodulation reference signal for broadcast signals is sent to the UE, the demodulation reference signal being scrambled using the Physical Cell Identity (PCID). The configuration information is transmitted based on Radio Resource Control (RRC) signaling.
16. The BS of claim 13, wherein the default subcarrier spacing is determined based on the frequency range.
17. The BS as claimed in claim 13, wherein, The transceiver is also configured to: The UE receives uplink access signals based on the subcarrier spacing configured by the System Information Block (SIB).
18. A method performed by a base station (BS) in a wireless communication system, the method comprising: Based on the default subcarrier spacing, an access signal is transmitted to the User Equipment (UE) including a synchronization signal and a broadcast signal for the Master Information Block (MIB), and Based on the access signal, information associated with the first subcarrier interval used for random access is provided. Send bandwidth configuration information to the UE, the configuration information including: Information about frequency resources for bandwidth, and Information regarding the second subcarrier spacing of the bandwidth, and Send or receive signals based on the configuration information.
Citation Information
Patent Citations
Device communication using a reduced channel bandwidth
CN103999528A
Resource allocation including a DC sub-carrier in a wireless communication system
US20140044064A1