WO2022265626A1 - Appareil et procédé d'économie d'énergie pour équipement utilisateur lors d'une transmission à programmation semi-persistante - Google Patents

Appareil et procédé d'économie d'énergie pour équipement utilisateur lors d'une transmission à programmation semi-persistante Download PDF

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Publication number
WO2022265626A1
WO2022265626A1 PCT/US2021/037510 US2021037510W WO2022265626A1 WO 2022265626 A1 WO2022265626 A1 WO 2022265626A1 US 2021037510 W US2021037510 W US 2021037510W WO 2022265626 A1 WO2022265626 A1 WO 2022265626A1
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WIPO (PCT)
Prior art keywords
pdsch
symbols
decoding
sleep state
successful
Prior art date
Application number
PCT/US2021/037510
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English (en)
Inventor
Jian Gu
Original Assignee
Zeku, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Zeku, Inc. filed Critical Zeku, Inc.
Priority to PCT/US2021/037510 priority Critical patent/WO2022265626A1/fr
Publication of WO2022265626A1 publication Critical patent/WO2022265626A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • Embodiments of the present disclosure relate to an apparatus and method for saving power for a user equipment (UE) in wireless communications. Specifically, embodiments relate to an apparatus and method for saving power by using fewer symbols when decoding a physical downlink shared channel (PDSCH) in semi-persistent scheduling transmission.
  • UE user equipment
  • PDSCH physical downlink shared channel
  • Orthogonal frequency division multiplexing is one of the most widely used and adopted digital multi carrier methods and has been used extensively for cellular communications, such as 4th-generation (4G) Long Term Evolution (LTE) and 5th-generation (5G) New Radio (NR).
  • Embodiments of an apparatus and method for saving power for a user equipment (UE) in wireless communications are disclosed herein.
  • an apparatus including at least one processor and a memory storing instructions.
  • the instructions when executed by the at least one processor, cause the apparatus to awaken the apparatus from a sleep state.
  • the instructions when executed by the at least one processor, further cause the apparatus to receive, from a base station (BS), a reference signal symbol.
  • the instructions when executed by the at least one processor, further cause the apparatus to perform a channel estimation to obtain an instant link quality, based on the reference signal symbol.
  • the instructions, when executed by the at least one processor further cause the apparatus to demodulate k physical downlink shared channel (PDSCH) symbols transmitted by and received from the BS.
  • PDSCH physical downlink shared channel
  • k is an estimated number of symbols required for a successful decoding of the PDSCH, k is fewer than a total number of symbols in a slot, and k is determined from the instant link quality.
  • the instructions when executed by the at least one processor, further cause the apparatus to attempt a decoding of the PDSCH using the demodulated k PDSCH symbols.
  • the instructions when executed by the at least one processor, further cause the apparatus to, in response to the decoding of the PDSCH being successful, return the apparatus to the sleep state.
  • a method for wireless communication includes awakening a wireless communication apparatus from a sleep state.
  • the method further includes receiving, from a BS, a reference signal symbol.
  • the method further includes performing a channel estimation to obtain an instant link quality, based on the reference signal symbol.
  • the method further includes demodulating k PDSCH symbols transmitted by and received from the BS. k is an estimated number of symbols required for a successful decoding of the PDSCH, k is fewer than a total number of symbols in a slot, and k is determined from the instant link quality.
  • the method further includes attempting a decoding of the PDSCH using the k demodulated PDSCH symbols.
  • the method further includes, in response to the decoding of the PDSCH being successful, returning the apparatus to the sleep state.
  • a baseband chip in another example, includes an awakening circuit.
  • the awakening circuit is configured to awaken a wireless communication apparatus from a sleep state.
  • the baseband chip further includes a reference signal circuit.
  • the reference signal circuit is configured to receive, from a BS, a reference signal symbol.
  • the baseband chip further includes a channel estimation circuit.
  • the channel estimation circuit is configured to perform a channel estimation to obtain an instant link quality, based on the reference signal symbol.
  • the baseband chip further includes a demodulation circuit.
  • the demodulation circuit is configured to demodulate k PDSCH symbols transmitted by and received from the BS.
  • the baseband chip further includes a decoding circuit.
  • the decoding circuit is configured to attempt a decoding of the PDSCH using the k demodulated PDSCH symbols.
  • the baseband chip further includes a sleeping circuit. The sleeping circuit is configured to, in response to the decoding of the PDSCH being successful, return the apparatus to the sleep state.
  • FIG 1 illustrates a wireless network, according to some embodiments of the present disclosure.
  • FIG. 2 illustrates an example of a timeline for power management at a user equipment (UE).
  • UE user equipment
  • FIG. 3 illustrates an example of a timeline for power management at a user equipment (UE), according to some embodiments of the present disclosure.
  • FIGS. 4A and 4B illustrate block diagrams of an apparatus including a host chip, a radio frequency (RF) chip, and a baseband chip implementing a wireless communication system, according to some embodiments of the present disclosure.
  • RF radio frequency
  • FIG. 5 illustrates a block diagram of a communications device, according to some embodiments of the present disclosure.
  • FIG. 6 illustrates a flowchart of a method for power management at a user equipment (UE), according to some embodiments of the present disclosure.
  • FIG. 7 illustrates a flowchart of a method for power management at a user equipment (UE), according to some embodiments of the present disclosure.
  • FIG. 8 illustrates a flowchart of a method for power management at a user equipment (UE), according to some embodiments of the present disclosure.
  • FIG. 9 is a diagram illustrating circuits implementing a method for power management at a user equipment (UE), according to some embodiments of the present disclosure.
  • UE user equipment
  • references in the specification to “one embodiment,” “an embodiment,” “an example embodiment,” “some embodiments,” “certain embodiments,” etc. indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, stmcture, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it would be within the knowledge of a person skilled in the pertinent art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures, or characteristics in a plural sense.
  • terms, such as “a,” “an,” or “the,” again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context.
  • the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.
  • the techniques described herein are principally described in the context of the operation of an orthogonal frequency division multiplexing (OFDM) or an orthogonal frequency division multiple access (OFDMA) system.
  • OFDM orthogonal frequency division multiplexing
  • OFDMA orthogonal frequency division multiple access
  • the techniques and ideas described herein may also be used for and in combination with various wireless communication networks, such as code division multiple access (CDMA) system, time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, single-carrier frequency division multiple access (SC-FDMA) system, and other networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • networks may include but are not limited to 4G LTE, and 5G NR cellular networks, as well as WI-FI wireless networks.
  • the terms “network” and “system” are often used interchangeably.
  • the techniques described herein may be used for the wireless networks mentioned above, as
  • Orthogonal frequency-division multiple access is a multi-user version of the popular orthogonal frequency-division multiplexing (OFDM) digital modulation scheme. Multiple access is achieved in OFDMA by assigning subsets of subcarriers to individual users. This allows simultaneous low-data-rate transmission from several users.
  • This disclosure describes a method and a corresponding apparatus for a UE to save power in Voice over Internet Protocol (VoIP) and other small packet streaming applications.
  • VoIP Voice over Internet Protocol
  • Examples of such small packet streaming applications are Voice over Long-Term Evolution (VoLTE) and Voice over 5G New Radio (VoNR).
  • VoLTE and VoNR are the practice of packetizing VoIP communications and transporting both the signaling and media components over a 4G LTE packet switched (PS) data path or the 5G user plane, respectively. These examples are in contrast to delivering voice using circuit switch (CS) methodologies, which requires 4G or 5G handsets to employ a secondary 3G radio.
  • PS packet switched
  • CS circuit switch
  • a pre-configured fixed modulation and coding scheme MCS
  • DCI downlink control information
  • BS base station
  • Embodiments of the present disclosure can receive partial subsets of symbols to correctly decode a physical downlink shared channel (PDSCH) with configured scheduling or semi-persistent scheduling. Therefore, the present embodiments may save UE power significantly.
  • MCS fixed modulation and coding scheme
  • FIG. 2 illustrates an example of a timeline for power management at a user equipment (UE).
  • UE user equipment
  • the sleep may be a light sleep state or a micro-sleep state. In such sleep states, less power may be saved than power saving in a deeper sleep state. However, it is not required that the sleep state be a light sleep state or a micro-sleep state, and other sleep states may be used in other embodiments, as appropriate.
  • the UE ramps up a modem and a radio frequency (RF) circuit. The use of such elements is described further with respect to FIGS. 4A-4B and 5-9. Then, the UE buffers the over- the-air signal in a memory.
  • RF radio frequency
  • the buffering continues until enough reference signal symbols are received, at which point the modem initiates a channel estimation. After the channel is estimated, the modem demodulates and decodes all PDSCH symbols based on the channel estimation. After the decoding is done, the modem goes back to sleep to save power.
  • a drawback of such typical approaches is that they consume a lot of power by receiving all symbols in a slot.
  • receiving all symbols in a slot is not always fully necessary. It may be possible to make a judgment about when to put the UE back into a sleep state based only on a partial subset of the symbols. Such an approach saves power for the UE by reducing the amount of energy it needs to expend in an awake state that is not needed.
  • a central aspect of this disclosure is that in most of the slots with a fixed MCS, a signal -to-noise ratio (SNR) is much higher than an SNR required by that MCS. Furthermore, only a single code block is needed for VoIP and other small packet streaming applications to operate successfully, as described further above. Therefore, the UE does not require all PDSCH symbols to be available to be able to decode correctly. For example, a UE determines the number of PDSCH symbols needed to decode the PDSCH successfully according to measures of real-time link quality, for example, SNR, and so on. As a result, the UE may receive only a necessary number of PDSCH symbols to save power. [0030] FIG.
  • wireless network 100 may include a network of nodes, such as a user equipment (UE) 102, an access node 104, and a core network element 106.
  • UE user equipment
  • User equipment 102 may be any terminal device, such as a mobile phone, a desktop computer, a laptop computer, a tablet, a vehicle computer, a gaming console, a printer, a positioning device, a wearable electronic device, a smart sensor, or any other device capable of receiving, processing, and transmitting information, such as any member of a vehicle to everything (V2X) network, a cluster network, a smart grid node, or an Internet-of-Things (IoT) node.
  • V2X vehicle to everything
  • cluster network such as a cluster network
  • smart grid node such as a smart grid node
  • IoT Internet-of-Things
  • Access node 104 may be a device that communicates with UE 102, such as a wireless access point, a base station (BS), a Node B, an enhanced Node B (eNodeB or eNB), a next-generation NodeB (gNodeB or gNB), a cluster master node, or the like. Access node 104 may have a wired connection to UE 102, a wireless connection to UE 102, or any combination thereof. Access node 104 may be connected to UE 102 by multiple connections, and UE 102 may be connected to other access nodes in addition to access node 104. Access node 104 may also be connected to other UEs. It is understood that access node 104 is illustrated by a radio tower by way of illustration and not by way of limitation.
  • Core network element 106 may serve access node 104 and user equipment 102 to provide core network services.
  • core network element 106 may include a home subscriber server (HSS), a mobility management entity (MME), a serving gateway (SGW), or a packet data network gateway (PGW).
  • HSS home subscriber server
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data network gateway
  • core network elements of an evolved packet core (EPC) system which is a core network for the LTE system.
  • EPC evolved packet core
  • core network element 106 includes an access and mobility management function (AMF) device, a session management function (SMF) device, or a user plane function (UPF) device, of a core network for the NR system.
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • Core network element 106 may connect with a large network, such as the Internet
  • IP Internet Protocol
  • data from user equipment 102 may be communicated to other user equipment connected to other access points, including, for example, a computer 110 connected to Internet 108, for example, using a wired connection or a wireless connection, or to a tablet 112 wirelessly connected to Internet 108 via a router 114.
  • computer 110 and tablet 112 provide additional examples of possible user equipment
  • router 114 provides an example of another possible access node.
  • a generic example of a rack-mounted server is provided as an illustration of core network element 106. However, there may be multiple elements in the core network including database servers, such as a database 116, and security and authentication servers, such as an authentication server 118.
  • Database 116 may, for example, manage data related to user subscriptions to network services.
  • a home location register (HLR) is an example of a standardized database of subscriber information for a cellular network.
  • authentication server 118 may handle authentication of users, sessions, and so on.
  • an authentication server function (AUSF) device may be the specific entity to perform user equipment authentication.
  • a single server rack may handle multiple such functions, such that the connections between core network element 106, authentication server 118, and database 116, may be local connections within a single rack.
  • wireless communication can be established between any suitable nodes in wireless network 100, such as between UE 102 and access node 104, and between UE 102 and core network element 106 for sending and receiving data (e.g., OFDMA symbol(s)).
  • a transmitting node e.g., a BS
  • the receiving device receives the symbol(s)
  • the receiver may perform the methods described in the present disclosure to improve the ability of the receiver to successfully receive the symbol(s) while saving power.
  • Each node of wireless network 100 in FIG. 1 that is suitable for the reception of signals, such as OFDMA signals, may be considered as a communications device. More detail regarding the possible implementation of a communications device is provided by way of example in the description of a communications device 500 in FIG. 5.
  • Communications device 500 may be configured as user equipment 102, access node 104, or core network element 106 in FIG. 1.
  • communications device 500 may also be configured as computer 110, router 114, tablet 112, database 116, or authentication server 118 in FIG. 1.
  • communications device 500 may include a processor 502, a memory 504, and a transceiver 506. These components are shown as connected to one another by a bus, but other connection types are also permitted.
  • communications device 500 When communications device 500 is user equipment 102, additional components may also be included, such as a user interface (UI), sensors, and the like. Similarly, communications device 500 may be implemented as a blade in a server system when communications device 500 is configured as core network element 106. Other implementations are also possible, and these enumerated examples are not to be taken as limiting.
  • UI user interface
  • sensors sensors
  • communications device 500 may be implemented as a blade in a server system when communications device 500 is configured as core network element 106.
  • Other implementations are also possible, and these enumerated examples are not to be taken as limiting.
  • Transceiver 506 may include any suitable device for sending and/or receiving data.
  • Communications device 500 may include one or more transceivers, although only one transceiver 506 is shown for simplicity of illustration.
  • An antenna 508 is shown as a possible communication mechanism for communications device 500. If the communication is multiple-input and multiple- output (MIMO), multiple antennas and/or arrays of antennas may be utilized for such communication.
  • examples of communications device 500 may communicate using wired techniques rather than (or in addition to) wireless techniques.
  • access node 104 may communicate wirelessly to user equipment 102 and may communicate by a wired connection (for example, by optical or coaxial cables) to core network element 106.
  • Other communication hardware such as a network interface card (NIC), may be included in communications device 500 as well.
  • NIC network interface card
  • communications device 500 may include processor 502.
  • Processor 502 may include microprocessors, microcontrollers, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout the present disclosure.
  • DSPs digital signal processors
  • ASICs application-specific integrated circuits
  • FPGAs field-programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout the present disclosure.
  • Processor 502 may be a hardware device having one or more processing cores.
  • Processor 502 may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Software can include computer instructions written in an interpreted language, a compiled language, or machine code. Other techniques for instructing hardware are also permitted under the broad category of software.
  • communications device 500 may also include memory 504.
  • Memory 504 can broadly include both memory and storage.
  • memory 504 may include random-access memory (RAM), read-only memory (ROM), static RAM (SRAM), dynamic RAM (DRAM), ferro-electric RAM (FRAM), electrically erasable programmable ROM (EEPROM), CD-ROM or other optical disk storage, hard disk drive (HDD), such as magnetic disk storage or other magnetic storage devices, Flash drive, solid-state drive (SSD), or any other medium that can be used to carry or store desired program code in the form of instructions that can be accessed and executed by processor 502.
  • RAM random-access memory
  • ROM read-only memory
  • SRAM static RAM
  • DRAM dynamic RAM
  • FRAM ferro-electric RAM
  • EEPROM electrically erasable programmable ROM
  • CD-ROM or other optical disk storage hard disk drive (HDD), such as magnetic disk storage or other magnetic storage devices
  • HDD hard disk drive
  • Flash drive solid-state drive (SSD)
  • SSD solid-state drive
  • memory 504 may be embodied by any
  • Processor 502, memory 504, and transceiver 506 may be implemented in various forms in communications device 500 for performing wireless communication with power management functions.
  • processor 502, memory 504, and transceiver 506 of communications device 500 are implemented (e.g., integrated) on one or more system-on-chips (SoCs).
  • SoCs system-on-chips
  • processor 502 and memory 504 may be integrated on an application processor (AP) SoC (sometimes known as a “host,” referred to herein as a “host chip”) that handles application processing in an operating system environment, including generating raw data to be transmitted.
  • API SoC application processor
  • processor 502 and memory 504 may be integrated on a baseband processor (BP) SoC (sometimes known as a modem, referred to herein as a “baseband chip”) that converts the raw data, e.g., from the host chip, to signals that can be used to modulate the carrier frequency for transmission, and vice versa, which can run a real-time operating system (RTOS).
  • BP baseband processor
  • RTOS real-time operating system
  • processor 502 and transceiver 506 may be integrated on an RF SoC (sometimes known as a transceiver, referred to herein as an “RF chip”) that transmits and receives RF signals with antenna 508.
  • RF SoC sometimes known as a transceiver, referred to herein as an “RF chip”
  • some or all of the host chip, baseband chip, and RF chip may be integrated as a single SoC.
  • a baseband chip and an RF chip may be integrated in a single SoC that manages all the radio functions for cellular communication.
  • Various aspects of the present disclosure related to power savings may be implemented as software and/or firmware elements executed by a generic processor in a baseband chip (e.g., a baseband processor). It is understood that in some examples, one or more of the software and/or firmware elements may be replaced by dedicated hardware components in the baseband chip, including integrated circuits (ICs), such as application-specific integrated circuits (ASICs).
  • ICs integrated circuits
  • ASICs application-specific integrated circuits
  • FIG. 3 illustrates an example of a timeline for power management at a user equipment (UE) 300, according to some embodiments of the present disclosure.
  • the timelines tracks the behavior of a signal over the air.
  • a signal may be a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the signal transmits various symbols in a slot. Specifically, these symbols begin with symbol i, continue with other symbols until symbol i + N1 , continue with other symbols until symbol i + N2, and continue with other symbols until symbol i + Nj, concluding the symbols in a slot.
  • the slot includes a series of symbols, and a subset of the symbols may be enough for decoding, as described further below.
  • the UE As the signal over the air (for example, symbols transmitted by a transmitter such as a base station (BS)) carries these various symbols in the slot, the UE according to one or more embodiments takes certain actions to control the operation of the UE. For example, the UE is able to resume sleep as early as possible, while receiving and decoding symbols from the PDSCH sent by the BS, as needed. However, the UE may have to ascertain when it is appropriate to resume the sleep state, without information loss or functional failure.
  • BS base station
  • the UE begins by being in a sleep state. Once the UE begins to wake up from the sleep state, the UE begins a ramp-up process, in which elements of the UE used to receive and process information from the signal are activated for active use. For example, a modem and/or an RF communications element may be ramped up for active use. However, other elements may be ramped up instead of or in addition to these elements.
  • the UE performs a buffering of the over-the-air signal in a memory. Such buffering allows the UE to manage information while awaiting at least one reference signal symbol. After such a reference signal symbol is successfully received, the UE begins a channel estimation. From the channel estimation, the UE is able to obtain an instant link quality, as described further below.
  • the UE is able to determine the number of symbols needed for successful decoding of the PDSCH symbols. Such a number is designated as k symbols. However, k is merely an estimate, and may not be sufficient to perform the decoding.
  • the UE demodulates and decodes k PDSCH symbols. Accordingly, the UE performs demodulation and decoding for a part or all of the symbols. More specifics of this aspect of embodiments are discussed more specifically with reference to FIGS. 6-8. However, based on this limited subset of symbols, one or more embodiments may be able to cause the UE to resume the sleep state, thereby reducing UE power consumption. The embodiments generally differ in terms of how they manage reference symbols and what actions they take if k reference symbols are insufficient.
  • a first embodiment generally corresponding to FIG. 6, works as follows.
  • the embodiment pertains to a method for UE power saving in a semi-persistent scheduling transmission. More specific operational details are provided in FIG. 6.
  • the UE gets out of a sleep state. Such a sleep state can be light sleep or micro-sleep, but other sleep types are possible in other embodiments.
  • the UE ramps up wireless communications hardware, such as a modem and/or an RF circuit capable of managing wireless communication between the BS and the UE by generating and receiving electromagnetic (EM) radiation with particular attributes.
  • EM electromagnetic
  • the UE buffers the over-the-air signal in a memory, allowing the UE to gather the information contained in an ongoing signal over the air.
  • an appropriate element such as a modem or another piece of channel estimation circuit, performs channel estimation and gets an instant link quality from the channel estimation.
  • the UE determines the number of symbols believed to be required for successful decoding of PDSCH, denoted as k.
  • the instant link quality and the MCS may be used in conjunction with a predefined equation or look-up table that defines a good initial choice for k.
  • Such an equation or table may be based on past experimentation or modeling.
  • Other approaches, such as an algorithm or a heuristic, are also possible to find k. In general, k should be fewer than the number of symbols in a slot, so that power saving may occur.
  • modem After a channel and relevant characteristics of the channel, such as instant link quality are estimated from the first reference signal symbol, modem demodulates and decodes k PDSCH symbols. If reference signal symbol(s) other than the first reference signal symbol exists in the selected k symbols, channel estimation is also done for the relevant symbols of the new reference signal.
  • the UE commences decoding after demodulation is done for the k symbols. If decoding based on demodulation results from k symbols is successful, the UE goes back to sleep to save power.
  • embodiments generally proceed in the same manner. However, if using k symbols is not sufficient for decoding, the following embodiments represent alternative ways to ensure that decoding occurs successfully.
  • the UE continues demodulation and commences the decoder after all symbols in the slot are demodulated. If a reference signal exists after the selected k symbols, a channel estimation is also done for new reference signal symbol(s) while receiving symbols after the k symbols. Because all symbols in the slot are demodulated before another attempt is made to do the decoding, the decoding should be most likely successful because the embodiment presented in FIG. 6 is essentially reverting to a typical approach if k symbols are not a sufficient basis for decoding.
  • the UE continues demodulation and attempts decoding after every single more additional symbol is demodulated, until decoding is successful or all PDSCH symbols are demodulated and decoded.
  • the embodiment presented in FIG. 7 is not limited to proceeding symbol by symbol and may also demodulate other groups of symbols with a plurality of symbols less than a total number of remaining symbols. If another reference signal exists after the selected k symbols, channel estimation is also done for new reference signal symbol(s) while receiving symbols after the k symbols, as discussed above in conjunction with FIG. 6. Once the decoding is successful, the UE goes back to sleep to save power.
  • the modem demodulates and decodes k PDSCH symbols after the channel estimation. If reference signal symbol(s) other than the first reference signal symbol exists in the selected k symbols, the UE waits for such one or more reference symbols to do channel estimation. After channel estimation results from any or all reference signal symbols in the k symbols are obtained and or awaited as described above, the modem (or similar alternative element) demodulates and decodes k PDSCH symbols.
  • Decoding commences after demodulation is done for k symbols. If the decoding based on demodulation results from k symbols is successful, the UE goes back to sleep to save power. Otherwise, the UE continues demodulation and kicks off decoding after every single more additional symbol is demodulated, until decoding is successful or all PDSCH symbols are demodulated and decoded. If a reference signal exists after the selected k symbols, channel estimation is also done for new reference signal symbol(s) while receiving symbols after the k symbols. As also noted with respect to FIG. 7, the embodiment presented in FIG. 8 is not limited to proceeding symbol by symbol and may also demodulate other groups of symbols with a plurality of symbols less than a total number of remaining symbols. If decoding is successful, the UE goes back to sleep to save power.
  • FIGS. 4A and 4B illustrate block diagrams of an apparatus including a host chip, a radio frequency (RF) chip, and a baseband chip implementing a wireless communication system according to some embodiments of the present disclosure.
  • the apparatus provided in FIGS. 4A and 4B may implement a UE that receives a PDSCH signal from a BS in a DL embodiment.
  • FIGS 4A and 4B illustrate block diagrams of a wireless communication system 400 including a host chip, an RF chip, and a baseband chip implementing a wireless communication system with UE power saving in semi- persistent scheduling transmission, as presented in FIGS. 6-9 in software and hardware, according to some embodiments of the present disclosure.
  • Wireless communication system 400 may be an example of any node of wireless network 100 in FIG. 1 suitable for signal reception, such as user equipment 102 or a core network element 106.
  • wireless communication system 400 may include an RF chip 402, a baseband chip 404A in FIG. 4A or baseband chip 404B in FIG.
  • wireless communication system 400 may further include a system memory 408 (also known as the main memory) that can be shared by each chip 402, 404A or 404B, or 406 through the main bus.
  • system memory 408 also known as the main memory
  • Baseband chip 404A or 404B is illustrated as a standalone system on a chip (SoC) in FIGS. 4A and 4B. However, it is understood that in one example, baseband chip 404A or 404B and RF chip 402 may be integrated as one SoC; in another example, baseband chip 404A or 404B and host chip 406 may be integrated as one SoC; in still another example, baseband chip 404A or 404B, RF chip 402, and host chip 406 may be integrated as one SoC, as described above.
  • SoC system on a chip
  • a UE may operate in a certain way to allow for power saving in semi -persistent scheduling transmission. Thus, the description presented herein should be understood accordingly.
  • host chip 406 may generate original data and send it to baseband chip
  • Baseband chip 404A or 404B for encoding, modulation, and mapping.
  • Baseband chip 404A or 404B may access the original data from host chip 406 directly using an interface 414 or through system memory 408 and then process the data for transmission as described further, below, in detail.
  • Baseband chip 404A or 404B then may pass the modulated signal (e.g., the OFDMA symbol) to RF chip 402 through interface 414.
  • a transmitter (Tx) 416 of RF chip 402 may convert the modulated signals in the digital form from baseband chip 404A or 404B into analog signals, i.e., RF signals, and transmit the RF signals through antenna 410 into the channel.
  • antenna 410 may receive the RF signals (e.g., the OFDMA symbol) through the channel and pass the RF signals to a receiver (Rx) 418 of RF chip 402.
  • RF chip 402 may perform any suitable front-end RF functions, such as filtering, down-conversion, or sample- rate conversion, and convert the RF signals into low-frequency digital signals (baseband signals) that can be processed by baseband chip 404A or 404B.
  • interface 414 of baseband chip 404A or 404B may receive the baseband signals, for example, the OFDMA symbol.
  • Baseband chip 404A or 404B then may perform the receiving and power-saving functions of the operations and elements of FIG. 6-9, described in further detail below.
  • the original data may be extracted by baseband chip 404A or 404B from the baseband signals and passed to host chip 406 through interface 414 or stored into system memory 408.
  • the power reduction schemes disclosed herein may be implemented in firmware and/or software by baseband chip 404A in FIG. 4A having a power reduction module, which may include firmware and/or software, where the power reduction module may be implemented and executed by a power reduction processor, such as baseband processor 420 executing the stored instructions, as illustrated in FIG. 4A.
  • Baseband processor 420 may be a generic processor, such as a central processing unit or a digital signal processor (DSP), not dedicated to power reduction. That is, baseband processor 420 is also responsible for any other functions of baseband chip 404A and can be interrupted when performing power reduction due to other processes with higher priorities.
  • DSP digital signal processor
  • Each element in wireless communication system 400 may be implemented as a software module executed by baseband processor 420 to perform the respective functions described above in detail.
  • the methods disclosed herein, for example, by wireless communication system 400 may be implemented in hardware by baseband chip 404B in FIG. 4B having a dedicated power reduction circuit 422, such as power reduction circuit 422, as illustrated in FIG. 4B.
  • Power reduction circuit 422 may include one or more integrated circuits (ICs), such as application-specific integrated circuits (ASICs), dedicated to implementing the power reduction schemes disclosed herein.
  • ICs integrated circuits
  • ASICs application-specific integrated circuits
  • Each element in wireless communication system 400 may be implemented as a circuit to perform the respective functions described above in detail.
  • One or more microcontrollers (not shown) in baseband chip 404B may be used to program and/or control the operations of power reduction circuit 422. It is understood that in some examples, the power reduction schemes disclosed herein may be implemented in a hybrid manner, e.g., in both hardware and software. For example, some elements in wireless communication system 400 may be implemented as a software module executed by baseband processor 420, while some elements in wireless communication system 400 may be implemented as circuits.
  • FIG. 6 illustrates a flowchart of a method for power management at a user equipment (UE) 600, according to some embodiments of the present disclosure.
  • the method awakens the UE from a sleep state.
  • the sleep state may be a light sleep state or a micro-sleep state.
  • the sleep states include other sleep states in other examples.
  • the UE may periodically check (for example, at appropriate intervals) to see if a transmitter, such as a base station (BS), intends to send PDSCH symbols in a slot.
  • BS base station
  • the method ramps up receiving hardware, such as a modem and/or an RF circuit.
  • a modem and an RF circuit are examples of hardware that should be activated to perform the methods of FIGS. 6-8.
  • the UE is no longer asleep and is ready to start actively receiving PDSCH symbols in a slot, such as from the BS.
  • the method buffers a signal received from a transmitter, such as a transmitting BS. Such a buffer allows the UE to gather data symbols in a slot until at least one reference symbol is received. Once the at least one reference symbol is received, the method is able to perform an initial channel estimation successfully.
  • the method performs channel estimation.
  • the method determines the number of symbols needed for successful decoding of the PDSCH, denoted as k symbols.
  • the initial channel estimation provides an instant link quality, including metrics such as SNR, capacity, and so on, and the MCS. Based on these metrics, the method is able to estimate a value for k that is likely to include enough reliable information, while still allowing successful decoding.
  • these metrics may be used in the context of an equation or look-up table to find k. However, these are not limiting, and k may be found in another way, such as with an appropriate algorithm or heuristic.
  • the method demodulates k symbols and updates the channel. For example, prior to performing the demodulating, the method checks to see if reference signal symbol(s) other than the first reference signal symbols exist in the selected k symbols and does an updated channel estimation based on these additional reference signal symbol(s). Once any required updates are made to the channel estimation, the method proceeds to demodulate the k symbols.
  • the method performs decoding. Based on the way in which k is ascertained, hopefully, k symbols will include enough information that the decoding is successful, and embodiments may include applications where only a subset of symbols in a slot are actually required for the needs of the application.
  • operation S614 the method determines whether the decoding is successful. If so, the method proceeds to operation S616. Otherwise, the method proceeds to operation S618.
  • operation S616 the method resumes a sleep state.
  • the resumption of the sleep state occurs after decoding is successful.
  • operation S618 the method demodulates the remaining symbols. While it might be possible that only a subset of remaining symbols would be enough for successful decoding, as presented in the embodiments of FIGS. 7-8, FIG. 6 is simpler and proceeds directly by reverting to an approach where it is certain that decoding will be successful.
  • operation S620 the method performs decoding. Because all remaining symbols were demodulated in S618, there will always be enough available information to perform decoding in operation S620. At this point in the method, the method returns to operation S616 in FIG. 6, in that all symbols have been demodulated and decoded. Accordingly, the method can proceed to operation S616 to resume the sleep state.
  • the UE handled the signal from the BS, and resumed the sleep state, ideally early enough to minimize power usage by the UE.
  • FIG. 7 illustrates a flowchart of a method for power management at a user equipment (UE) 700, according to some embodiments of the present disclosure.
  • operation S702 the method awakens the UE from a sleep state. Operation S702 is similar to operation S602.
  • operation S704 the method ramps up receiving hardware, such as a modem and/or an RF circuit. Operation S704 is similar to operation S604.
  • operation S706 the method buffers a signal received from a transmitter, such as a transmitting BS. Operation S706 is similar to operation S606.
  • operation S708 the method performs channel estimation. Operation S708 is similar to operation S608.
  • the method demodulates k symbols and updates the channel.
  • Operation S710 is similar to operation S610.
  • operation S712 the method performs decoding. Operation S712 is similar to operation S612.
  • operation S714 the method determines whether the decoding is successful or if decoding for all symbols in the slot is done. If so, the method proceeds to operation S716. Otherwise, the method proceeds to operation S718. Operation S714 is somewhat similar to operation S614.
  • operation S716 the method resumes a sleep state.
  • the resumption of the sleep state occurs after decoding is successful.
  • Operation S716 is similar to operation S616.
  • operation S7108 the method demodulates one more symbol.
  • Operation S718 differs from counterpart operation S618, in which all remaining symbols in the slot are demodulated. By demodulating one more symbol, it is possible that some power may still be saved. However, one more symbol does not guarantee successful decoding. Accordingly, this approach may require some overhead, especially if k is underestimated significantly. Also, variants are possible in other embodiments, such that S718 demodulates more than one additional symbol for decoding at S720.
  • operation S720 the method performs decoding. Because only one more symbol is demodulated, the decoding may or may not be successful. Even if multiple symbols are demodulated, unless all symbols in the slot are demodulated, the decoding may or may not be successful. Therefore, after operation S720 occurs, the method again performs S714 to see if the decoding is successful. If so, the method proceeds to S716 to cause the apparatus to resume being in a sleep state. Otherwise, the method returns to S718 to keep demodulating one or more symbols. [0090] In operation S722, the method ends in that the method has properly awakened the
  • the UE handled the signal from the BS, and resumed the sleep state, ideally early enough to minimize power usage by the UE.
  • FIG. 8 illustrates a flowchart of a method for power management at a user equipment (UE) 800, according to some embodiments of the present disclosure.
  • operation S802 the method awakens the UE from a sleep state. Operation S802 is similar to operation S602.
  • operation S804 the method ramps up receiving hardware, such as a modem and/or an RF circuit. Operation S804 is similar to operation S604.
  • operation S806 the method buffers a signal received from a transmitter, such as a transmitting BS. Operation S806 is similar to operation S606.
  • operation S808 the method performs channel estimation. Operation S808 is similar to operation S808.
  • operation S810 the method determines if an additional reference symbol is present. If so, the method proceeds to operation S820 to wait for the reference symbol and update the channel estimation accordingly. If not, the method proceeds directly to operation S812 to demodulate k symbols.
  • the decision performed in operation S810 helps differentiate the method of FIG. 8 from the methods of FIGS. 6-7.
  • operation S812 the method demodulates k symbols. Operation S812 is similar to operation S612. However, FIG. 8 manages reference symbols in a slightly different manner, based on using operation S820 to wait for a reference symbol, even if it occurs later in the signal reception and processing time interval.
  • operation S814 the method the method performs decoding. Operation S814 is similar to operation S620.
  • operation S816 the method determines whether the decoding is successful or if decoding for all symbols in the slot is done. If so, the method proceeds to operation S818. Otherwise, the method proceeds to operation S822, to keep demodulating symbols. Operation S816 is somewhat similar to operation S614.
  • operation S818 the method resumes a sleep state.
  • the resumption of the sleep state occurs after decoding is successful.
  • operation S820 the method waits for a reference symbol and updates a channel estimation accordingly.
  • operation S822 the method the method demodulates one more symbol.
  • Operation S822 differs from counterpart operation S618, in which all remaining symbols in the slot are demodulated. However, another embodiment is also possible in which the overall approach of FIG. 8 is used, but operation S822 demodulates a plurality of symbols or all remaining symbols, to facilitate the decoding.
  • operation S824 the method the method performs decoding. Because only one more symbol is demodulated, the decoding may or may not be successful. Therefore, after operation S824 occurs, the method again performs S816 to see if the decoding is successful. If so, the method proceeds to S818 to cause the apparatus to resume being in a sleep state.
  • the UE handled the signal from the BS, and resumed the sleep state, ideally early enough to minimize power usage by the UE.
  • FIG. 9 illustrates a block diagram of an apparatus 900 with power management functionality, according to some embodiments of the present disclosure.
  • the apparatus includes an awakening circuit 910, a reference signal circuit 912, a channel estimation circuit 914, a demodulation circuit 916, a decoding circuit 918, and a sleeping circuit 920.
  • These circuits are specialized hardware that implements the methods corresponding to various embodiments, such as those discussed with respect to FIG. 3 and characterized in FIGS. 6-8.
  • the apparatus 900 provides power management functionality.
  • the power management begins with awakening circuit 910.
  • the awakening circuit 910 periodically detects if an incoming signal, such as a PDSCH, indicates that it is appropriate to begin an awakening process from a sleep state.
  • the sleep state may be a light sleep state or a micro sleep state.
  • the awakening circuit 910 may check for an incoming signal and awaken the UE accordingly.
  • the interval at which the awakening circuit 910 detects an incoming signal varies and may depend at least in part on a sleep state and/or predetermined settings.
  • the awakening circuit 910 may perform operation S602 in FIG. 6, operation S702 in FIG. 7, or operation S802 in FIG. 8.
  • the awakening circuit 910 may also perform additional preparatory steps. For example, the awakening circuit 910 may perform a ramping up, such as that of operation S604 in FIG. 6, operation S704 in FIG. 7, and operation S804 in FIG. 8. The awakening circuit 910 may also perform a buffering while awaiting the reference signal, such as that of operation S606 in FIG. 6, operation S706 in FIG. 7, and operation S806 in FIG. 8.
  • the reference signal circuit 912 receives a reference signal symbol.
  • the reference signal circuit 912 receives a single such symbol, but more symbols are involved in other embodiments, as discussed above.
  • the apparatus 900 is prepared to derive an initial channel estimation. For example, this receiving corresponds to that of operation S606 in FIG. 6, operation S706 in FIG. 7, and operation S806 in FIG. 8.
  • the channel estimation circuit 914 performs initial channel estimation, such as that of operation S608 in FIG. 6, operation S708 in FIG. 7, and operation S808 in FIG. 8.
  • the channel estimation circuit 914 is also the element that performs the subsequent updated channel estimation of operation S820 in FIG. 8.
  • the demodulation circuit 916 performs the various demodulations involved in the methods of FIGS. 6-8. For example, demodulation circuit 916 performs operations S610 and S618 in FIG. 6, operations S710 and S718 in FIG. 7, and operations S812 and S822 in FIG. 8 as explained in these figures.
  • the decoding circuit 918 performs the various demodulations involved in the methods of FIGS. 6-8. For example, decoding circuit 918 performs operations S612 and S620 in FIG. 6, operations S712 and S720 in FIG. 7, and operations S814 and S824 in FIG. 8 as explained in these figures. The decoding circuit 918 also determines whether the decoding is successful, such as at operation S614 in FIG. 6, operation S714 in FIG. 7, and operation S816 in FIG. 8.
  • the sleeping circuit 920 resumes the sleep state for the apparatus once the overall decoding is successfully performed. For example, the sleeping circuit 920 resumes the sleep state in operation S616 in FIG. 6, operation S716 in FIG. 7, and operation S816 in FIG. 8. Once the apparatus is in the sleep state, operation S622 in FIG. 6, operation S722 in FIG. 7, and operation S826 in FIG. 8 end the method.
  • an apparatus including at least one processor and a memory storing instructions.
  • the instructions when executed by the at least one processor, cause the apparatus to awaken the apparatus from a sleep state.
  • the instructions when executed by the at least one processor, further cause the apparatus to receive, from a BS, a reference signal symbol.
  • the instructions when executed by the at least one processor, further cause the apparatus to perform a channel estimation to obtain an instant link quality, based on the reference signal symbol.
  • the instructions, when executed by the at least one processor further cause the apparatus to demodulate k PDSCH symbols transmitted by and received from the BS.
  • k is an estimated number of symbols required for a successful decoding of the PDSCH, k is fewer than a total number of symbols in a slot, and k is determined from the instant link quality.
  • the instructions when executed by the at least one processor, further cause the apparatus to attempt a decoding of the PDSCH using the demodulated k PDSCH symbols.
  • the instructions when executed by the at least one processor, further cause the apparatus to, in response to the decoding of the PDSCH being successful, return the apparatus to the sleep state.
  • k is determined from the instant link quality using an equation or a look-up table.
  • the instructions when executed by the at least one processor, further cause the apparatus to ramp up either one or both of a baseband chip and a radio frequency (RF) chip of the apparatus.
  • RF radio frequency
  • the instructions when executed by the at least one processor, further cause the apparatus to buffer an over-the-air signal comprising the PDSCH in the memory.
  • a signal-to-noise ratio (SNR) of the PDSCH is higher than a threshold SNR associated with a modulation and coding scheme (MCS) of the PDSCH.
  • the sleep state is a light sleep state or a micro-sleep state.
  • the instant link quality obtained by the channel estimation comprises either one or both of signal-to-noise ratio (SNR) and channel capacity.
  • SNR signal-to-noise ratio
  • k is determined based on the instant link quality and a modulation and coding scheme (MCS) of the PDSCH.
  • MCS modulation and coding scheme
  • the instructions in response to the decoding the PDSCH being unsuccessful, the instructions further cause the apparatus to continue demodulation of PDSCH symbols and attempt another decoding of the PDSCH after all PDSCH symbols are demodulated.
  • the instructions in response to the decoding of the PDSCH being unsuccessful, the instructions further cause the apparatus to demodulate a next PDSCH symbol and attempt an additional decoding of the PDSCH after the next PDSCH symbol is demodulated. [0123] In some embodiments, in response to the additional decoding being successful, the instructions further cause the apparatus to return to the sleep state.
  • the instructions in response to the additional decoding not being successful, the instructions further cause the apparatus to demodulate PDSCH symbols one at a time and attempt decoding of the PDSCH again as PDSCH symbols are demodulated, until decoding is successful or all PDSCH symbols are demodulated and decoded.
  • the instructions in response to one or more additional reference symbols existing in the k PDSCH symbols, the instructions further cause the apparatus to also base the channel estimation on the one or more additional reference symbols.
  • the instructions in response to no other reference signal symbol existing in the k PDSCH symbols, the instructions further cause the apparatus to modulate and decode a second k PDSCH symbols after the channel estimation and use one or more reference symbols from the second k PDSCH symbols for the channel estimation.
  • the instructions in response to one or more additional reference symbols existing in the second k PDSCH symbols, the instructions further cause the apparatus to wait for the one or more additional reference symbols to perform the channel estimation.
  • the instructions in response to unsuccessfully decoding the PDSCH, the instructions further cause the apparatus to demodulate a plurality of PDSCH symbols and attempt an additional decoding of the PDSCH after the plurality of PDSCH symbols is demodulated. [0129] In some embodiments, in response to the additional decoding being successful, the instructions further cause the apparatus to return to the sleep state.
  • the apparatus is used for Voice Over Internet Protocol
  • VoIP Voice IP
  • VoIP Video IP
  • the apparatus is a user equipment (UE).
  • UE user equipment
  • a method for wireless communication includes awakening a wireless communication apparatus from a sleep state.
  • the method further includes receiving, from a BS, a reference signal symbol.
  • the method further includes performing a channel estimation to obtain an instant link quality, based on the reference signal symbol.
  • the method further includes demodulating k PDSCH symbols transmitted by and received from the BS. k is an estimated number of symbols required for a successful decoding of the PDSCH, k is fewer than a total number of symbols in a slot, and k is determined from the instant link quality.
  • the method further includes attempting a decoding of the PDSCH using the k demodulated PDSCH symbols.
  • the method further includes, in response to the decoding of the PDSCH being successful, returning the apparatus to the sleep state.
  • a baseband chip includes an awakening circuit.
  • the awakening circuit is configured to awaken a wireless communication apparatus from a sleep state.
  • the baseband chip further includes a reference signal circuit.
  • the reference signal circuit is configured to receive, from a BS, a reference signal symbol.
  • the baseband chip further includes a channel estimation circuit.
  • the channel estimation circuit is configured to perform a channel estimation to obtain an instant link quality, based on the reference signal symbol.
  • the baseband chip further includes a demodulation circuit.
  • the demodulation circuit is configured to demodulate k PDSCH symbols transmitted by and received from the BS.
  • the baseband chip further includes a decoding circuit.
  • the decoding circuit is configured to attempt a decoding of the PDSCH using the k demodulated PDSCH symbols.
  • the baseband chip further includes a sleeping circuit The sleeping circuit is configured to, in response to the decoding of the PDSCH being successful, return the apparatus to the sleep state.
  • Embodiments can improve the UE’s power consumption without sacrificing performance.
  • QPSK Quadrature Phase Shift Keying

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des modes de réalisation d'un appareil et d'un procédé d'économie d'énergie pour équipement utilisateur (UE) sont divulgués. Dans un exemple, un appareil active l'appareil en état de veille. L'appareil reçoit, en provenance d'une station de base (BS), un symbole de signal de référence. L'appareil effectue une estimation de canal pour obtenir une qualité de liaison instantanée, sur la base du symbole de signal de référence. L'appareil démodule k symboles de canal partagé de liaison descendante physique (PDSCH) transmis par la BS et reçus en provenance de cette dernière. k est un nombre estimé de symboles requis pour un décodage réussi du PDSCH, k est inférieur à un nombre total de symboles dans un créneau, et k est déterminé à partir de la qualité de liaison instantanée. L'appareil tente un décodage du PDSCH en utilisant les k symboles de PDSCH démodulés. L'appareil, en réponse au décodage du PDSCH réussi, remet l'appareil à l'état de veille.
PCT/US2021/037510 2021-06-15 2021-06-15 Appareil et procédé d'économie d'énergie pour équipement utilisateur lors d'une transmission à programmation semi-persistante WO2022265626A1 (fr)

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