WO2021109013A1 - Demande de ressource de liaison montante rapide basée sur une assistance externe - Google Patents

Demande de ressource de liaison montante rapide basée sur une assistance externe Download PDF

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Publication number
WO2021109013A1
WO2021109013A1 PCT/CN2019/122885 CN2019122885W WO2021109013A1 WO 2021109013 A1 WO2021109013 A1 WO 2021109013A1 CN 2019122885 W CN2019122885 W CN 2019122885W WO 2021109013 A1 WO2021109013 A1 WO 2021109013A1
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Prior art keywords
uplink resource
resource configuration
request
base station
uplink
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PCT/CN2019/122885
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English (en)
Inventor
Qiaoyu Li
Chao Wei
Huilin Xu
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2019/122885 priority Critical patent/WO2021109013A1/fr
Publication of WO2021109013A1 publication Critical patent/WO2021109013A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • aspects of the disclosure relate generally to wireless communications.
  • Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G) , a second-generation (2G) digital wireless phone service (including interim 2.5G networks) , a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., LTE or WiMax) .
  • 1G first-generation analog wireless phone service
  • 2G second-generation digital wireless phone service
  • 3G third-generation
  • 4G fourth-generation
  • LTE or WiMax Fifth Generation
  • PCS Personal Communications Service
  • Examples of known cellular systems include the cellular Analog Advanced Mobile Phone System (AMPS) , and digital cellular systems based on Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , the Global System for Mobile access (GSM) variation of TDMA, etc.
  • AMPS cellular Analog Advanced Mobile Phone System
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • GSM Global System for Mobile access
  • a fifth generation (5G) wireless standard referred to as New Radio (NR)
  • NR New Radio
  • the 5G standard according to the Next Generation Mobile Networks Alliance, is designed to provide data rates of several tens of megabits per second to each of tens of thousands of users, with 1 gigabit per second to tens of workers on an office floor.
  • Several hundreds of thousands of simultaneous connections should be supported in order to support large wireless sensor deployments. Consequently, the spectral efficiency of 5G mobile communications should be significantly enhanced compared to the current 4G standard.
  • signaling efficiencies should be enhanced and latency should be substantially reduced compared to current standards.
  • a low-tier UE when a low-tier UE has uplink data to send to the network, and therefore needs to send a buffer status report (BSR) medium access control control element (MAC-CE) on a physical uplink shared channel (PUSCH) , it sends a message to a premium UE over a sidelink between the low-tier UE and the premium UE to request the premium UE to send a scheduling request (SR) to the base station serving the low-tier UE on behalf of the low-tier UE.
  • the premium UE sends an SR to the base station to acquire the uplink resource (s) for the low-tier UE’s BSR MAC-CE.
  • the base station then configures the uplink resource (s) to the low-tier UE in a Uu message to the premium UE.
  • the premium UE then sends the uplink resource configuration to the low-tier UE via the sidelink.
  • the low-tier UE can then transmit the BSR MAC-CE on the configured uplink resource (s) .
  • the base station configures PUSCH uplink resource (s) to the low-tier UE in a Uu message to the low-tier UE.
  • the low-tier UE can then transmit the uplink data in its buffer on the configured PUSCH resource (s) .
  • the low-tier UE can instead request the premium UE to send a BSR MAC-CE on behalf of the low-tier UE.
  • the premium UE transmits a BSR MAC-CE on PUSCH resources.
  • the base station configures PUSCH uplink resource (s) to the low-tier UE in a Uu message to the premium UE.
  • the premium UE can then send the PUSCH resource configuration to the low-tier UE via the sidelink.
  • the low-tier UE can then transmit the uplink data in its buffer on the configured PUSCH resource (s) .
  • a method of wireless communication performed by a first UE includes receiving, from a second UE over a sidelink connection between the first UE and the second UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, transmitting the request for the uplink resource configuration to the base station, receiving, from the base station, the uplink resource configuration for the second UE, and transmitting, over the sidelink connection, the uplink resource configuration to the second UE.
  • a method of wireless communication performed by the second UE includes transmitting, to the first UE over a sidelink connection between the second UE and the first UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, receiving, from the first UE over the sidelink connection, the uplink resource configuration for the second UE, and transmitting, to the base station, uplink data using the uplink resource configuration.
  • a first UE includes a memory, at least one processor, and at least one transceiver configured to: receive, from a second UE over a sidelink connection between the first UE and the second UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, transmit the request for the uplink resource configuration to the base station, receive, from the base station, the uplink resource configuration for the second UE, and transmit, over the sidelink connection, the uplink resource configuration to the second UE.
  • a second UE includes a memory, at least one processor, and at least one transceiver configured to: transmit, to a first UE over a sidelink connection between the second UE and the first UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, receive, from the first UE over the sidelink connection, the uplink resource configuration for the second UE, and transmit to the base station, uplink data using the uplink resource configuration.
  • a first UE includes means for receiving, from a second UE over a sidelink connection between the first UE and the second UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, means for transmitting the request for the uplink resource configuration to the base station, means for receiving, from the base station, the uplink resource configuration for the second UE, and means for transmitting, over the sidelink connection, the uplink resource configuration to the second UE.
  • a second UE includes means for transmitting, to a first UE over a sidelink connection between the second UE and the first UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, means for receiving, from the first UE over the sidelink connection, the uplink resource configuration for the second UE, and means for transmitting, to the base station, uplink data using the uplink resource configuration.
  • a non-transitory computer-readable medium storing computer-executable instructions includes computer-executable instructions comprising at least one instruction instructing a first UE to receive, from a second UE over a sidelink connection between the first UE and the second UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, at least one instruction instructing the first UE to transmit the request for the uplink resource configuration to the base station, at least one instruction instructing the first UE to receive, from the base station, the uplink resource configuration for the second UE, and at least one instruction instructing the first UE to transmit, over the sidelink connection, the uplink resource configuration to the second UE.
  • a non-transitory computer-readable medium storing computer-executable instructions includes computer-executable instructions comprising at least one instruction instructing a second UE to transmit, to a first UE over a sidelink connection between the second UE and the first UE, a request for the first UE to send, on behalf of the second UE, a request for an uplink resource configuration to a base station serving the second UE, at least one instruction instructing the second UE to receive, from the first UE over the sidelink connection, the uplink resource configuration for the second UE, and at least one instruction instructing the second UE to transmit, to the base station, uplink data using the uplink resource configuration.
  • FIG. 1 illustrates an exemplary wireless communications system, according to various aspects.
  • FIG. 2 is a diagram illustrating an example of a base station in communication with a UE in a wireless communication network.
  • FIGS. 3A and 3B are diagrams illustrating examples of uplink frame structures and channels within the frame structures, according to aspects of the disclosure.
  • FIG. 4 is a diagram of an exemplary base station, a premium UE, and a low-tier UE, according to aspects of the disclosure.
  • FIG. 5 illustrates an exemplary flow between a premium UE, a low-tier UE, and a base station, according to aspects of the disclosure.
  • FIG. 6 illustrates an exemplary method from the perspective of the premium UE 404, according to aspects of the disclosure.
  • FIG. 7 illustrates an exemplary method from the perspective of the low-tier UE 406, according to aspects of the disclosure.
  • FIG. 8 is a conceptual data flow diagram illustrating data flow between different means/components according to aspects of the disclosure.
  • FIGS. 9 and 10 are diagrams illustrating examples of hardware implementations of a premium UE and a low-tier UE, according to aspects of the disclosure.
  • sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs) ) , by program instructions being executed by one or more processors, or by a combination of both. Additionally, the sequence (s) of actions described herein can be considered to be embodied entirely within any form of non-transitory computer-readable storage medium having stored therein a corresponding set of computer instructions that, upon execution, would cause or instruct an associated processor of a device to perform the functionality described herein.
  • ASICs application specific integrated circuits
  • a UE may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) /virtual reality (VR) headset, etc. ) , vehicle (e.g., automobile, motorcycle, bicycle, etc. ) , Internet of Things (IoT) device, etc. ) used by a user to communicate over a wireless communications network.
  • wireless communication device e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) /virtual reality (VR) headset, etc. )
  • vehicle e.g., automobile, motorcycle, bicycle, etc.
  • IoT Internet of Things
  • a UE may be mobile or may (e.g., at certain times) be stationary, and may communicate with a radio access network (RAN) .
  • RAN radio access network
  • the term “UE” may be referred to interchangeably as an “access terminal” or “AT, ” a “client device, ” a “wireless device, ” a “subscriber device, ” a “subscriber terminal, ” a “subscriber station, ” a “user terminal” or UT, a “mobile terminal, ” a “mobile station, ” or variations thereof.
  • AT access terminal
  • client device e.g., a “wireless device
  • UEs can communicate with a core network via a RAN, and through the core network the UEs
  • a base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP) , a network node, a NodeB, an evolved NodeB (eNB) , a New Radio (NR) Node B (also referred to as a gNB or gNodeB) , etc.
  • AP access point
  • eNB evolved NodeB
  • NR New Radio
  • a base station may provide purely edge node signaling functions while in other systems it may provide additional control and/or network management functions.
  • a communication link through which UEs can send signals to a base station is called an uplink (UL) channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc. ) .
  • UL uplink
  • a communication link through which the base station can send signals to UEs is called a downlink (DL) or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc. ) .
  • DL downlink
  • forward link channel e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.
  • TCH traffic channel
  • base station may refer to a single physical transmission-reception point (TRP) or to multiple physical TRPs that may or may not be co-located.
  • TRP transmission-reception point
  • the physical TRP may be an antenna of the base station corresponding to a cell of the base station.
  • the physical TRPs may be an array of antennas (e.g., as in a multiple-input multiple-output (MIMO) system or where the base station employs beamforming) of the base station.
  • MIMO multiple-input multiple-output
  • the physical TRPs may be a distributed antenna system (DAS) (anetwork of spatially separated antennas connected to a common source via a transport medium) or a remote radio head (RRH) (a remote base station connected to a serving base station) .
  • DAS distributed antenna system
  • RRH remote radio head
  • the non-co-located physical TRPs may be the serving base station receiving the measurement report from the UE and a neighbor base station whose reference RF signals the UE is measuring. Because a TRP is the point from which a base station transmits and receives wireless signals, as used herein, references to transmission from or reception at a base station are to be understood as referring to a particular TRP of the base station.
  • An “RF signal” comprises an electromagnetic wave of a given frequency that transports information through the space between a transmitter and a receiver.
  • a transmitter may transmit a single “RF signal” or multiple “RF signals” to a receiver.
  • the receiver may receive multiple “RF signals” corresponding to each transmitted RF signal due to the propagation characteristics of RF signals through multipath channels.
  • the same transmitted RF signal on different paths between the transmitter and receiver may be referred to as a “multipath” RF signal.
  • FIG. 1 illustrates an exemplary wireless communications system 100.
  • the wireless communications system 100 (which may also be referred to as a wireless wide area network (WWAN) ) may include various base stations 102 and various UEs 104.
  • the base stations 102 may include macro cell base stations (high power cellular base stations) and/or small cell base stations (low power cellular base stations) .
  • the macro cell base station may include eNBs where the wireless communications system 100 corresponds to an LTE network, or gNBs where the wireless communications system 100 corresponds to a NR network, or a combination of both, and the small cell base stations may include femtocells, picocells, microcells, etc.
  • the base stations 102 may collectively form a RAN and interface with a core network 170 (e.g., an evolved packet core (EPC) in LTE or a next generation core (NGC) or 5G core (5GC) in NR) through backhaul links 122, and through the core network 170 to one or more application servers 172.
  • a core network 170 e.g., an evolved packet core (EPC) in LTE or a next generation core (NGC) or 5G core (5GC) in NR
  • EPC evolved packet core
  • NGC next generation core
  • 5GC 5G core
  • the base stations 102 may perform functions that relate to one or more of transferring user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC /NGC) over backhaul links 134, which may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. In an aspect, one or more cells may be supported by a base station 102 in each coverage area 110.
  • a “cell” is a logical communication entity used for communication with a base station (e.g., over some frequency resource, referred to as a carrier frequency, component carrier, carrier, band, or the like) , and may be associated with an identifier (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) for distinguishing cells operating via the same or a different carrier frequency.
  • PCID physical cell identifier
  • VCID virtual cell identifier
  • different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of UEs.
  • MTC machine-type communication
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • a cell may refer to either or both the logical communication entity and the base station that supports it, depending on the context.
  • the term “cell” may also refer to a geographic coverage area of a base station (e.g., a sector) , insofar as a carrier frequency can be detected and used for communication within some portion of geographic coverage areas 110.
  • While neighboring macro cell base station 102 geographic coverage areas 110 may partially overlap (e.g., in a handover region) , some of the geographic coverage areas 110 may be substantially overlapped by a larger geographic coverage area 110.
  • a small cell base station 102' may have a coverage area 110' that substantially overlaps with the coverage area 110 of one or more macro cell base stations 102.
  • a network that includes both small cell and macro cell base stations may be known as a heterogeneous network.
  • a heterogeneous network may also include home eNBs (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • HeNBs home eNBs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include UL (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use MIMO antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links 120 may be through one or more carrier frequencies. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL) .
  • the wireless communications system 100 may further include a wireless local area network (WLAN) access point (AP) 150 in communication with WLAN stations (STAs) 152 via communication links 154 in an unlicensed frequency spectrum (e.g., 5 GHz) .
  • WLAN STAs 152 and/or the WLAN AP 150 may perform a clear channel assessment (CCA) or listen before talk (LBT) procedure prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • LBT listen before talk
  • LBT is a mechanism by which a transmitter (e.g., a UE on the uplink or a base station on the downlink) applies CCA before using the channel/subband.
  • the transmitter performs a CCA check and listens on the channel/subband for the duration of the CCA observation time, which should not be less than some threshold (e.g., 15 microseconds) .
  • the channel may be considered occupied if the energy level in the channel exceeds some threshold (proportional to the transmit power of the transmitter) . If the channel is occupied, the transmitter should delay further attempts to access the medium by some random factor (e.g., some number between 1 and 20) times the CCA observation time. If the channel is not occupied, the transmitter can begin transmitting. However, the maximum contiguous transmission time on the channel should be less than some threshold, such as 5 milliseconds.
  • the small cell base station 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell base station 102' may employ LTE or NR technology and use the same 5 GHz unlicensed frequency spectrum as used by the WLAN AP 150. The small cell base station 102', employing LTE /5G in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • NR in unlicensed spectrum may be referred to as NR-U.
  • LTE in an unlicensed spectrum may be referred to as LTE-U, licensed assisted access (LAA) , or MulteFire.
  • the wireless communications system 100 may further include a millimeter wave (mmW) base station 180 that may operate in mmW frequencies and/or near mmW frequencies in communication with a UE 182.
  • Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band may be referred to as a millimeter wave.
  • Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave.
  • the mmW base station 180 and the UE 182 may utilize beamforming (transmit and/or receive) over a mmW communication link 184 to compensate for the extremely high path loss and short range.
  • one or more base stations 102 may also transmit using mmW or near mmW and beamforming. Accordingly, it will be appreciated that the foregoing illustrations are merely examples and should not be construed to limit the various aspects disclosed herein.
  • Transmit beamforming is a technique for focusing an RF signal in a specific direction.
  • a network node e.g., a base station
  • transmit beamforming the network node determines where a given target device (e.g., a UE) is located (relative to the transmitting network node) and projects a stronger downlink RF signal in that specific direction, thereby providing a faster (in terms of data rate) and stronger RF signal for the receiving device (s) .
  • a network node can control the phase and relative amplitude of the RF signal at each of the one or more transmitters that are broadcasting the RF signal.
  • a network node may use an array of antennas (referred to as a “phased array” or an “antenna array” ) that creates a beam of RF waves that can be “steered” to point in different directions, without actually moving the antennas.
  • the RF current from the transmitter is fed to the individual antennas with the correct phase relationship so that the radio waves from the separate antennas add together to increase the radiation in a desired direction, while cancelling to suppress radiation in undesired directions.
  • Transmit beams may be quasi-collocated, meaning that they appear to the receiver (e.g., a UE) as having the same parameters, regardless of whether or not the transmitting antennas of the network node themselves are physically collocated.
  • the receiver e.g., a UE
  • QCL relation of a given type means that certain parameters about a second reference RF signal on a second beam can be derived from information about a source reference RF signal on a source beam.
  • the receiver can use the source reference RF signal to estimate the Doppler shift, Doppler spread, average delay, and delay spread of a second reference RF signal transmitted on the same channel.
  • the receiver can use the source reference RF signal to estimate the Doppler shift and Doppler spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type C, the receiver can use the source reference RF signal to estimate the Doppler shift and average delay of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type D, the receiver can use the source reference RF signal to estimate the spatial receive parameter of a second reference RF signal transmitted on the same channel.
  • the receiver uses a receive beam to amplify RF signals detected on a given channel. For example, the receiver can increase the gain setting and/or adjust the phase setting of an array of antennas in a particular direction to amplify (e.g., to increase the gain level of) the RF signals received from that direction.
  • a receiver is said to beamform in a certain direction, it means the beam gain in that direction is high relative to the beam gain along other directions, or the beam gain in that direction is the highest compared to the beam gain in that direction of all other receive beams available to the receiver.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal-to-interference-plus-noise ratio
  • Receive beams may be spatially related.
  • a spatial relation means that parameters for a transmit beam for a second reference signal can be derived from information about a receive beam for a first reference signal.
  • a UE may use a particular receive beam to receive a reference downlink reference signal (e.g., synchronization signal block (SSB) ) from a base station.
  • the UE can then form a transmit beam for sending an uplink reference signal (e.g., sounding reference signal (SRS) ) to that base station based on the parameters of the receive beam.
  • SSB synchronization signal block
  • SRS sounding reference signal
  • a “downlink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the downlink beam to transmit a reference signal to a UE, the downlink beam is a transmit beam. If the UE is forming the downlink beam, however, it is a receive beam to receive the downlink reference signal.
  • an “uplink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the uplink beam, it is an uplink receive beam, and if a UE is forming the uplink beam, it is an uplink transmit beam.
  • the frequency spectrum in which wireless nodes is divided into multiple frequency ranges, FR1 (from 450 to 6000 MHz) , FR2 (from 24250 to 52600 MHz) , FR3 (above 52600 MHz) , and FR4 (between FR1 and FR2) .
  • FR1 from 450 to 6000 MHz
  • FR2 from 24250 to 52600 MHz
  • FR3 above 52600 MHz
  • FR4 between FR1 and FR2
  • one of the carrier frequencies is referred to as the “primary carrier” or “anchor carrier” or “primary serving cell” or “PCell, ” and the remaining carrier frequencies are referred to as “secondary carriers” or “secondary serving cells” or “SCells.
  • the anchor carrier is the carrier operating on the primary frequency (e.g., FR1) utilized by a UE 104/182 and the cell in which the UE 104/182 either performs the initial radio resource control (RRC) connection establishment procedure or initiates the RRC connection re-establishment procedure.
  • the primary carrier carries all common and UE-specific control channels, and may be a carrier in a licensed frequency (however, this is not always the case) .
  • a secondary carrier is a carrier operating on a second frequency (e.g., FR2) that may be configured once the RRC connection is established between the UE 104 and the anchor carrier and that may be used to provide additional radio resources.
  • the secondary carrier may be a carrier in an unlicensed frequency.
  • the secondary carrier may contain only necessary signaling information and signals, for example, those that are UE-specific may not be present in the secondary carrier, since both primary uplink and downlink carriers are typically UE-specific. This means that different UEs 104/182 in a cell may have different downlink primary carriers. The same is true for the uplink primary carriers.
  • the network is able to change the primary carrier of any UE 104/182 at any time. This is done, for example, to balance the load on different carriers.
  • a “serving cell” (whether a PCell or an SCell) corresponds to a carrier frequency /component carrier over which some base station is communicating, the term “cell, ” “serving cell, ” “component carrier, ” “carrier frequency, ” and the like can be used interchangeably.
  • one of the frequencies utilized by the macro cell base stations 102 may be an anchor carrier (or “PCell” ) and other frequencies utilized by the macro cell base stations 102 and/or the mmW base station 180 may be secondary carriers ( “SCells” ) .
  • the simultaneous transmission and/or reception of multiple carriers enables the UE 104/182 to significantly increase its data transmission and/or reception rates. For example, two 20 MHz aggregated carriers in a multi-carrier system would theoretically lead to a two-fold increase in data rate (i.e., 40 MHz) , compared to that attained by a single 20 MHz carrier.
  • the wireless communications system 100 may further include a UE 164 that may communicate with a macro cell base station 102 over a communication link 120 and/or the mmW base station 180 over a mmW communication link 184.
  • the macro cell base station 102 may support a PCell and one or more SCells for the UE 164 and the mmW base station 180 may support one or more SCells for the UE 164.
  • the wireless communications system 100 may further include one or more UEs, such as UE 190, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) sidelinks (or simply “sidelinks” ) .
  • D2D device-to-device
  • P2P peer-to-peer
  • sidelinks or simply “sidelinks”
  • UE 190 may have a D2D P2P sidelink 192 with one of the UEs 104 connected to one of the base stations 102 (e.g., through which UE 190 may indirectly obtain cellular connectivity) , a D2D P2P sidelink 194 with WLAN STA 152 connected to the WLAN AP 150 (through which UE 190 may indirectly obtain WLAN-based Internet connectivity) , and/or a D2D P2P sidelink 196 with the UE 182 connected to the mmW base stations 180 (e.g., through which UE 190 may indirectly obtain cellular connectivity) .
  • the D2D P2P sidelinks 192 and 194 may be supported with any well-known D2D RAT, such as LTE Direct (LTE-D) , WiFi Direct (WiFi-D) , and so on.
  • the UE 190 may be referred to as a “low-tier” UE, and the UE 104/152/164 to which it is connected over the D2D P2P sidelink 192/194/196 may be referred to as a “premium” UE. More specifically, starting in the Third Generation Partnership Project (3GPP) Release 17, a number of UE types are being allocated a new UE classification denoted as “NR-Light. ” Such UEs may also be referred to “low-tier” UEs. Examples of UE types that fall under the NR-Light/low-tier classification include wearable devices (e.g., smart watches, smart glasses, smart rings, eHealth related devices, medical monitoring devices, etc. ) , industrial sensors (pressure sensors, humidity sensors, thermometers, motion sensors, accelerometers, etc. ) , video cameras (e.g., surveillance cameras, etc. ) , and so on.
  • wearable devices e.g., smart watches, smart glasses, smart rings, eHealth
  • NR-Light UEs generally have lower baseband processing capability, fewer antennas, lower operational bandwidth capabilities, and lower uplink transmission power compared to “normal” UEs (e.g., UEs not classified as NR-Light) , also referred to as “premium” UEs.
  • NR-Light UEs may be limited in terms of maximum bandwidth (e.g., 5 to 20 MHz) , maximum transmission power (e.g., 20 dBm, 14 dBm, etc. ) , number of receive antennas (e.g., 1 receive antenna, 2 receive antennas, etc. ) , and so on.
  • Some NR-Light UEs may also be sensitive in terms of power consumption (e.g., insofar as they may have lower battery capacity and/or require a long battery life, such as several years) and/or may be highly mobile.
  • Different UE tiers can normally be differentiated by UE category or by UE capability.
  • Certain tiers of UEs may also report to the network their type (e.g., “low-tier, ” “premium” ) .
  • certain resources/channels may be dedicated to certain types of UEs and the UE may select the allocated resources/channels based on its type.
  • FIG. 2 illustrates an exemplary base station 202 (e.g., an eNB, a gNB, a small cell AP, a WLAN AP, etc. ) in communication with an exemplary UE 204 in a wireless network, according to aspects of the disclosure.
  • the base station 202 may correspond to any of base stations described herein, and the UE 204 may correspond to any of the UEs described herein.
  • IP packets from the core network e.g., core network 270
  • the controller/processor 275 implements functionality for a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter-RAT mobility, and measurement configuration for UE measurement reporting;
  • PDCP layer functionality associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions;
  • RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through automatic repeat request (ARQ) , concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs,
  • the transmit (TX) processor 216 and the receive (RX) processor 270 implement Layer-1 functionality associated with various signal processing functions.
  • Layer-1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 216 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an orthogonal frequency division multiplexing (OFDM) subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • OFDM orthogonal frequency division multiplexing
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 274 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 204.
  • Each spatial stream may then be provided to one or more different antennas 220 via a separate transmitter 218a.
  • Each transmitter 218a may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 254a receives a signal through its respective antenna 252. Each receiver 254a recovers information modulated onto an RF carrier and provides the information to the RX processor 256.
  • the TX processor 268 and the RX processor 256 implement Layer-1 functionality associated with various signal processing functions.
  • the RX processor 256 may perform spatial processing on the information to recover any spatial streams destined for the UE 204. If multiple spatial streams are destined for the UE 204, they may be combined by the RX processor 256 into a single OFDM symbol stream. The RX processor 256 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT) .
  • FFT fast Fourier transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 202. These soft decisions may be based on channel estimates computed by the channel estimator 258.
  • the soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the base station 202 on the physical channel.
  • the data and control signals are then provided to the controller/processor 259, which implements Layer-3 and Layer-2 functionality.
  • the controller/processor 259 can be associated with a memory 260 that stores program codes and data.
  • the memory 260 may be referred to as a computer-readable medium.
  • the controller/processor 259 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network.
  • the controller/processor 259 is also responsible for error detection.
  • the controller/processor 259 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through hybrid automatic repeat request (HARQ) , priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • Channel estimates derived by the channel estimator 258 from a reference signal or feedback transmitted by the base station 202 may be used by the TX processor 268 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 268 may be provided to different antenna 252 via separate transmitters 254b. Each transmitter 254b may modulate an RF carrier with a respective spatial stream for transmission.
  • the transmitters 254b and the receivers 254a may be one or more transceivers, one or more discrete transmitters, one or more discrete receivers, or any combination thereof.
  • the UL transmission is processed at the base station 202 in a manner similar to that described in connection with the receiver function at the UE 204.
  • Each receiver 218b receives a signal through its respective antenna 220.
  • Each receiver 218b recovers information modulated onto an RF carrier and provides the information to a RX processor 270.
  • the transmitters 218a and the receivers 218b may be one or more transceivers, one or more discrete transmitters, one or more discrete receivers, or any combination thereof.
  • the controller/processor 275 can be associated with a memory 276 that stores program codes and data.
  • the memory 276 may be referred to as a computer-readable medium.
  • the controller/processor 275 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 204. IP packets from the controller/processor 275 may be provided to the core network.
  • the controller/processor 275 is also responsible for error detection.
  • FIG. 3A is a diagram 300 illustrating an example of an uplink frame structure, according to aspects of the disclosure.
  • FIG. 3B is a diagram 350 illustrating an example of channels within the uplink frame structure illustrated in FIG. 3A, according to aspects of the disclosure.
  • a UE may use the illustrated frame structure and channels to transmit uplink data to a base station.
  • Other wireless communications technologies may have a different frame structures and/or different channels. In the example of FIG.
  • a frame in the time domain, may be divided into equally sized subframes (e.g., 10 subframes of 1 ms each in the example of FIG. 3A) .
  • Each subframe may include one or more consecutive time slots (e.g., 2 slots of 0.5 ms each in the example of FIG. 3A) .
  • time is represented horizontally (e.g., on the X axis) with time increasing from left to right
  • frequency is represented vertically (e.g., on the Y axis) with frequency increasing (or decreasing) from bottom to top.
  • a resource grid may be used to represent the two time slots represented in FIG. 3A, each time slot including one or more time concurrent resource blocks (RBs) (also referred to as physical RBs (PRBs) ) in the frequency domain.
  • the resource grid is further divided into multiple resource elements (REs) .
  • An RE may correspond to one symbol length in the time domain and one subcarrier in the frequency domain.
  • an RB may contain 12 consecutive subcarriers in the frequency domain and 7 consecutive symbols in the time domain, for a total of 84 REs.
  • an RB may contain 12 consecutive subcarriers in the frequency domain and 6 consecutive symbols in the time domain, for a total of 72 REs.
  • the number of bits carried by each RE depends on the modulation scheme.
  • LTE and in some cases NR, utilizes OFDM on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • SC-FDM single-carrier frequency division multiplexing
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K multiple orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (resource block) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal FFT size may be equal to 128, 256, 512, 1024, or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (i.e., 6 resource blocks) , and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10, or 20 MHz, respectively.
  • LTE supports a single numerology (subcarrier spacing, symbol length, etc. ) .
  • NR may support multiple numerologies, for example, subcarrier spacing of 15 kHz, 30 kHz, 60 kHz, 120 kHz and 204 kHz or greater may be available. Table 1 provided below lists some various parameters for different NR numerologies.
  • some of the REs carry demodulation reference signals (DMRS) for channel estimation at the base station.
  • the UE may additionally transmit sounding reference signals (SRS) in, for example, the last symbol of a subframe.
  • SRS sounding reference signals
  • the SRS may have a comb structure, and a UE may transmit SRS on one of the combs.
  • the SRS may be used by a base station to obtain the channel state information (CSI) for each UE.
  • CSI describes how an RF signal propagates from the UE to the base station and represents the combined effect of scattering, fading, and power decay with distance.
  • the system uses the SRS for resource scheduling, link adaptation, massive MIMO, beam management, etc.
  • FIG. 3B illustrates an example of various channels within an UL subframe of a frame, according to aspects of the disclosure.
  • a physical random access channel (PRACH) 356 may be within one or more subframes within a frame based on the PRACH configuration.
  • the PRACH 356 may include six consecutive RB pairs within a subframe.
  • the PRACH 356 allows the UE to perform initial system access and achieve UL synchronization.
  • a physical uplink control channel (PUCCH) 352 may be located on edges of the UL system bandwidth.
  • PUCCH physical uplink control channel
  • the PUCCH 352 carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • HARQ ACK/NACK feedback HARQ ACK/NACK feedback.
  • the physical uplink shared channel (PUSCH) 354 carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • low-tier UEs generally have reduced features and functionality compared to premium UEs.
  • low-tier UEs such as wearables, are often operated around premium UEs.
  • the present disclosure provides techniques for using external assistance from other UEs (e.g., premium UEs) to simplify the uplink data transmission procedure of low-tier UEs.
  • FIG. 4 is a diagram 400 of an exemplary base station 402 (e.g., any of the base stations described herein) , premium UE 404 (e.g., any of UEs 104, 152, 164, 204) , and low-tier UE 406 (e.g., UE 190, 204) , according to aspects of the disclosure.
  • the base station 402 has multiple antennas 412, and a panel of such antennas 412 (e.g., all antennas 412 on a particular side of the base station 402) may correspond to a cell and/or TRP supported by the base station 402.
  • the premium UE 404 is illustrated as a smartphone and the low-tier UE 406 is illustrated as a smartwatch.
  • these are merely examples and the disclosure is not so limited.
  • the premium UE 404 has a wireless communication link 420-1 (e.g., a communication link 120, mmW communication link 184) to the base station 402.
  • the low-tier UE 406 also has a wireless communication link 420-2 (e.g., a communication link 120, mmW communication link 184) to the base station 402.
  • the wireless communication links 420 may be cellular air interface links, referred to as Uu interface links or simply Uu links.
  • the premium UE 404 and the low-tier UE 406 may also communicate with each other over a sidelink 430 (e.g., D2D P2P sidelink 192, 194, 196) .
  • the sidelink 430 may be an NR sidelink, and may support a physical sidelink control channel (PSCCH) and/or physical sidelink control channel (PSSCH) between the premium UE 404 and the low-tier UE 406.
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink control channel
  • the low-tier UE 406 can use the sidelink 430 to extend its communication coverage and/or increase its channel throughput to the cellular network (i.e., through the sidelink 430 to the wireless communication link 420-1 to the base station 402) . More specifically, the low-tier UE 406 can use the sidelink 430 to leverage the higher communication capabilities of the premium UE 404 by transmitting uplink data (e.g., requests, user data) to the network via the premium UE 404 (over the sidelink 430) and receiving data (e.g., control information, user data) from the network via the premium UE 404 (over the sidelink 430) .
  • uplink data e.g., requests, user data
  • data e.g., control information, user data
  • the low-tier UE it is beneficial for the low-tier UE to maintain both the wireless communication link 420-2 and the sidelink 430 because the coverage provided by the wireless communication link 420-2 is much broader than the coverage provided by the sidelink 430, but communication over the sidelink 430 has lower power consumption.
  • a UE When a UE (either a low-tier UE or a premium UE) has uplink data to transmit to the network, it first needs to send a BSR via a medium access control control element (MAC-CE) on the PUSCH (e.g., PUSCH 354) . However, if there are no PUSCH resources available, the UE needs to send a scheduling request (SR) to the network via the PUCCH (e.g., 352) to request the needed PUSCH resources. However, if there are no PUCCH resources available, the UE has to rely on the random access, or RACH, procedure, which is much slower. Given a low-tier UEs lower communication capabilities and power saving goals, this is especially an issue for low-tier UEs.
  • MAC-CE medium access control control element
  • the present disclosure describes techniques to provide fast uplink resource requests via a sidelink when there are no uplink resources available for a low-tier UE (e.g., low-tier UE 406) .
  • Such techniques reduce the power consumption and transmission delay for a low-tier UE.
  • the low-tier UE 406 when the low-tier UE 406 has uplink data to send to the network, and therefore needs to send a BSR on the PUSCH, rather than send the BSR over its own wireless communication link 420-2, it sends a message to the premium UE 404 over the sidelink 430 to request the premium UE 404 to send an SR to the base station 402 on behalf of the low-tier UE 404.
  • the premium UE 404 sends an SR to the base station 402 to acquire the uplink resource (s) for the low-tier UE’s 406 BSR MAC-CE.
  • the premium UE 404 may send the SR on PUCCH resources of the wireless communication link 420-1.
  • the base station 402 then configures the uplink resource (s) to the low-tier UE 406 in a Uu message to the premium UE 404.
  • the premium UE 404 then sends the uplink resource configuration from the base station 402 to the low-tier UE 406 via the sidelink 430.
  • the low-tier UE 406 can then transmit the BSR MAC-CE on the configured uplink resource (s) .
  • the base station 402 configures PUSCH uplink resource (s) to the low-tier UE 406 in a Uu message to the low-tier UE 406 (or to the premium UE 404) .
  • the low-tier UE 406 can then transmit the uplink data in its buffer on the configured PUSCH resource (s) .
  • the low-tier UE 406 can instead request the premium UE 404 to send a BSR MAC-CE on behalf of the low-tier UE 406.
  • the premium UE 404 transmits a BSR MAC-CE on PUSCH resources of the wireless communication link 420-1.
  • the base station 402 configures PUSCH uplink resource (s) to the low-tier UE 406 in a Uu message to the premium UE 404.
  • the premium UE 404 can then send the PUSCH resource configuration to the low-tier UE 406 via the sidelink 430.
  • the low-tier UE 406 can then transmit the uplink data in its buffer on the configured PUSCH resource (s) .
  • the premium UE 404 will first send an SR to the base station 402 to acquire the necessary PUSCH resource (s) for the BSR MAC-CE.
  • the premium UE 404 may send the SR on PUCCH resources of the wireless communication link 420-1.
  • the base station 402 configures the PUSCH resource (s) to the premier UE 404 in a Uu message.
  • the premier UE 404 can then transmit the BSR MAC-CE to the base station 402 on behalf of the low-tier UE 406.
  • FIG. 5 illustrates an exemplary flow 500 between the premium UE 404, the low-tier UE 406, and the base station 402, according to aspects of the disclosure.
  • the low-tier UE 406 transmits, to the premium UE 406, a request for the premium UE 406 to send, on behalf of the low-tier UE 406, a request for an uplink resource configuration to the base station 402.
  • the low-tier UE 406 may send the request over the sidelink 430 between the low-tier UE 406 and the premium UE 404.
  • the request for the uplink resource configuration may be an SR.
  • the uplink resource configuration may be a PUSCH configuration for the low-tier UE 406 to transmit a BSR MAC-CE to the base station 402.
  • the request for the uplink resource configuration may be a BSR MAC-CE. That is, the low-tier UE 406 is requesting the premium UE 404 to send a BSR MAC-CE to the base station 402 on its behalf.
  • the premium UE 404 forwards the request for the uplink resource configuration to the base station 402 over the wireless communication link 420-1. If the request for the uplink resource configuration is an SR, the premium UE 404 transmits the request for the uplink resource configuration to the base station 402 over PUCCH resources on the wireless communication link 420-1. If, however, the request for the uplink resource configuration is a BSR MAC-CE, the premium UE 404 transmits the request for the uplink resource configuration to the base station 402 over PUSCH resources of the wireless communication link 420-1.
  • the base station 402 allocates uplink resources to the low-tier UE 406. If the request for the uplink resource configuration is an SR, the base station 402 allocates PUSCH resources on the wireless communication link 402-2 for the low-tier UE 406 to send the BSR MAC-CE. If, however, the request for the uplink resource configuration is a BSR MAC-CE, the base station 402 allocates PUSCH resources on the wireless communication link 402-2 for the low-tier UE 406 to send the uplink data in its buffer.
  • the base station 402 transmits the uplink resource configuration for the allocated uplink resources to the premium UE 406 over the wireless communication link 402-1.
  • the premium UE 404 forwards the uplink resource configuration to the low-tier UE 406 over the sidelink 430.
  • the low-tier UE 406 transmits uplink data to the base station 402 over the wireless communication link 420-2 based on the received uplink resource configuration. If the uplink resource configuration is for the BSR MAC-CE, the low-tier UE 406 sends the BSR MAC-CE to the base station 402 over the allocated PUSCH resources on the wireless communication link 420-2. If, however, the uplink resource configuration is for the uplink data in the low-tier UE’s 406 buffer, the low-tier UE 406 sends the uplink data (e.g., user data) to the base statin 402 over the allocated PUSCH resources on the wireless communication link 420-2.
  • the uplink resource configuration is for the BSR MAC-CE
  • the low-tier UE 406 sends the uplink data (e.g., user data) to the base statin 402 over the allocated PUSCH resources on the wireless communication link 420-2.
  • the uplink resource configuration may include an uplink resource configuration, an uplink resource indication, and/or an uplink grant.
  • FIG. 6 illustrates an exemplary method 600 from the perspective of the premium UE 404, according to aspects of the disclosure.
  • the premium UE 404 receives, from the low-tier UE 404, a request for the premium UE 404 to send, on behalf of the low-tier UE 406, a request for an uplink resource configuration to the base station 402.
  • the premium UE 404 may receive the request from the low-tier UE 406 over the sidelink 430.
  • the request for the uplink resource configuration may be an SR.
  • the requested uplink resource configuration may be a PUSCH configuration for the low-tier UE 406 to transmit a BSR MAC-CE to the base station 402.
  • the request for the uplink resource configuration may be a BSR MAC-CE. That is, the low-tier UE 406 is requesting the premium UE 404 to send a BSR MAC-CE to the base station 402 on its behalf.
  • the premium UE 404 transmits the request for the uplink resource configuration to the base station 402 over the wireless communication link 420-1. If the request for the uplink resource configuration is an SR, the premium UE 404 transmits the request for the uplink resource configuration to the base station 402 over PUCCH resources on the wireless communication link 420-1. If, however, the request for the uplink resource configuration is a BSR MAC-CE, the premium UE 404 transmits the request for the uplink resource configuration to the base station 402 over PUSCH resources of the wireless communication link 420-1.
  • the premium UE 404 receives, from the base station 402, the requested uplink resource configuration. That is, the premium UE 404 receives an uplink resource configuration for uplink resources that have been allocated in response to the request for the uplink resource configuration.
  • the uplink resource configuration may be received over the wireless communication link 402-1.
  • the premium UE 404 transmits the uplink resource configuration to the low-tier UE 406 over the sidelink 430.
  • the low-tier UE 406 can then transmit its uplink data to the base station 402 over the wireless communication link 420-2.
  • the uplink resource configuration is for the BSR MAC-CE
  • the low-tier UE 406 sends the BSR MAC-CE to the base station 402 over the allocated PUSCH resources on the wireless communication link 420-2.
  • the low-tier UE 406 sends the uplink data (e.g., user data) to the base statin 402 over the allocated PUSCH resources on the wireless communication link 420-2.
  • the uplink data e.g., user data
  • FIG. 7 illustrates an exemplary method 700 from the perspective of the low-tier UE 406, according to aspects of the disclosure.
  • the low-tier UE 406 transmits, to the premium UE 406, a request for the premium UE 406 to send, on behalf of the low-tier UE 406, a request for an uplink resource configuration to the base station 402.
  • the low-tier UE 406 may send the request over the sidelink 430 between the low-tier UE 406 and the premium UE 404.
  • the request for the uplink resource configuration may be an SR.
  • the uplink resource configuration may be a PUSCH configuration for the low-tier UE 406 to transmit a BSR MAC-CE to the base station 402.
  • the request for the uplink resource configuration may be a BSR MAC-CE. That is, the low-tier UE 406 is requesting the premium UE 404 to send a BSR MAC-CE to the base station 402 on its behalf.
  • the low-tier UE 406 receives the requested uplink resource configuration from the premium UE 404 over the sidelink 430.
  • the uplink resource configuration may be for the low-tier UE 406 to transmit a BSR MAC-CE to the base station 402.
  • the uplink resource configuration may be for the low-tier UE 406 to transmit the uplink data in the low-tier UE’s 406 buffer.
  • the low-tier UE 406 transmits the uplink data to the base station 402 over the wireless communication link 420-2 based on the received uplink resource configuration. If the uplink resource configuration is for the BSR MAC-CE, the low- tier UE 406 sends the BSR MAC-CE to the base station 402 over the allocated PUSCH resources on the wireless communication link 420-2. If, however, the uplink resource configuration is for the uplink data in the low-tier UE’s 406 buffer, the low-tier UE 406 sends the uplink data (e.g., user data) to the base statin 402 over the allocated PUSCH resources on the wireless communication link 420-2.
  • the uplink resource configuration is for the BSR MAC-CE
  • the low-tier UE 406 sends the uplink data (e.g., user data) to the base statin 402 over the allocated PUSCH resources on the wireless communication link 420-2.
  • FIG. 8 is a simplified block diagram illustrating an exemplary data flow between different means/components of the low-tier UE 406 and the premium UE 404, according to aspects of the disclosure.
  • the low-tier UE 406 includes a buffer controller 810 in communication with a buffer 812, which may correspond to processor circuitry of the UE 406 coupled to a memory component of the UE 406.
  • the buffer 812 may store uplink data to be transmitted to the network (e.g., application server 172) , such as user data, location data, control data, etc.
  • the buffer controller 810 may store data to and read data from the buffer 812.
  • the buffer controller 810 may correspond to the TX processor 268 and/or the controller/processor 259, and the buffer 812 may correspond to the memory 260.
  • the low-tier UE 406 further includes a WWAN communication device 830 for communicating with (e.g., transmitting data to, receiving data from) one or more base stations (e.g., base station 402) , TRPs, cells, etc. over a wireless communication link (e.g., wireless communication link 420-2) .
  • the WWAN communication device 830 may correspond to one or more of the receiver (s) 254a and transmitter (s) 254b or the transceiver (s) comprising the receiver (s) 254a and transmitter (s) 254b.
  • the low-tier UE 406 further includes a sidelink communication device 820 for communicating (e.g., transmitting data to, receiving data from) with other UEs (e.g., premium UE 404) over one or more sidelinks (e.g., sidelink 430) .
  • the sidelink communication device 820 may correspond to one or more of the receiver (s) 254a and transmitter (s) 254b or the transceiver (s) comprising the receiver (s) 254a and transmitter (s) 254b.
  • the premium UE 404 includes a WWAN communication device 850 for communicating with (e.g., transmitting data to, receiving data from) one or more base station (e.g., base station 402) , TRPs, cells, etc. over a wireless communication link (e.g., wireless communication link 420-1) .
  • the WWAN communication device 850 may correspond to one or more of the receiver (s) 218b and transmitter (s) 218a or the transceiver (s) comprising the receiver (s) 218b and transmitter (s) 218a.
  • the premium UE 404 further includes a sidelink communication device 840 for communicating (e.g., transmitting data to, receiving data from) with other UEs (e.g., low-tier UE 406, other premium UEs 404) over one or more sidelinks (e.g., sidelink 430) .
  • the sidelink communication device 840 may correspond to one or more of the receiver (s) 218b and transmitter (s) 218a or the transceiver (s) comprising the receiver (s) 218b and transmitter (s) 218a.
  • the buffer controller 810 determines that there is uplink data to send to the serving base station (e.g., base station 402) and sends a request for an uplink resource configuration to the sidelink communication device 820.
  • the sidelink communication device 820 sends the request for the uplink resource configuration to the premium UE 406 over a sidelink (e.g., sidelink 430) .
  • the request for the uplink resource configuration may be an SR or a BSR MAC-CE.
  • the sidelink communication device 840 of the premium UE 404 receives the request from the low-tier UE 406 over the sidelink.
  • the request is forwarded to the WWAN communication device 850, which forwards the request to the base station serving the low-tier UE 406 (e.g., base station 402) .
  • the WWAN communication device 850 transmits the request over PUCCH resources, but if the request for the uplink resource configuration is a BSR MAC-CE, the WWAN communication device 850 transmits the request over PUSCH resources.
  • the WWAN communication device 850 receives a configuration for uplink resources for the low-tier UE 406. If the request for the uplink resource configuration was an SR, the configured resources are PUSCH resources for the low-tier UE 406 to send a BSR MAC-CE. If the request for the uplink resource configuration was a BSR MAC-CE, the configured resources are PUSCH resources for the low-tier UE 406 to send the uplink data in its buffer.
  • the received uplink resource configuration is forwarded to the sidelink communication device 840, which forwards the configuration to the sidelink communication device 820 of the low-tier UE 406.
  • the configuration is then forwarded to the WWAN communication device 830. If the uplink resource configuration is for a BSR MAC-CE, the WWAN communication device 830 transmits the BSR MAC-CE over the allocated PUSCH resources. If the uplink resource configuration is for the uplink data in the buffer 812, the WWAN communication device 830 transmits the uplink data (e.g., user data) over the allocated PUSCH resources.
  • the components of the low-tier UE 406 and the premium UE 404 illustrated in FIG. 8 may perform the blocks of the algorithms in FIGS. 5-7. As such, each block in FIGS. 5-7 may be performed by one or more of the components illustrated in FIG. 8.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG. 9 is a diagram illustrating an example of a hardware implementation for the premium UE 404 employing a processing system 914, according to aspects of the disclosure.
  • the processing system 914 may be implemented with a bus architecture, represented generally by the bus 924.
  • the bus 924 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 914 and the overall design constraints.
  • the bus 924 links together various circuits including one or more processors and/or hardware components, represented by the processor 904, a request component 930, and a computer-readable medium /memory 906.
  • the request component 930 may be a hardware and/or software module, which may cause, or execution of which may cause, the premium UE 404 to perform the premium UE operations described herein, such as the blocks of FIGS. 5 and 6.
  • the request component 830 may be a software component running in the processor 904, resident/stored in the computer readable medium /memory 906, one or more hardware components coupled to the processor 904, or some combination thereof.
  • the processing system 914 may be coupled to a sidelink transceiver 910 and a WWAN transceiver 920.
  • the sidelink transceiver 910 is coupled to one or more antennas 912
  • the WWAN transceiver 920 is coupled to one or more antennas 922.
  • the transceivers 910 and 920 provide means for communicating with various other apparatus over a transmission medium.
  • the transceivers 910 and 920 receive signals from the one or more antennas 912 and 922, extract information from the received signals, and provide the extracted information to the processing system 914.
  • the transceivers 910 and 920 receive information from the processing system 914, specifically the request component 930, and based on the received information, generate signals to be applied to the one or more antennas 912 and 922.
  • the transceivers 910 and 920 may be a single transceiver configured for both WWAN and sidelink communication.
  • the processing system 914 includes a processor 904 coupled to a computer-readable medium /memory 906.
  • the processor 904 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 906.
  • the software when executed by the processor 904, causes the processing system 914 to perform the various functions described above for the premium UE 404.
  • the computer-readable medium /memory 906 may also be used for storing data that is manipulated by the processor 904 when executing software.
  • the processing system 914 may be a component of the UE 204 of FIG. 2 and may include the memory 260, and/or at least one of the TX processor 268, the RX processor 256, and the controller/processor 259.
  • FIG. 10 is a diagram illustrating an example of a hardware implementation for the low-tier UE 406 employing a processing system 1014, according to aspects of the disclosure.
  • the processing system 1014 may be implemented with a bus architecture, represented generally by the bus 1024.
  • the bus 1024 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1014 and the overall design constraints.
  • the bus 1024 links together various circuits including one or more processors and/or hardware components, represented by the processor 1004, a request component 1030, and a computer-readable medium /memory 1006.
  • the request component 1030 may be a hardware and/or software module, which may cause, or execution of which may cause, the low-tier UE 406 to perform the low-tier UE operations described herein, such as the blocks of FIGS. 5 and 7.
  • the request component 830 may be a software component running in the processor 1004, resident/stored in the computer readable medium /memory 1006, one or more hardware components coupled to the processor 1004, or some combination thereof.
  • the processing system 1014 may be coupled to a sidelink transceiver 1010 and a WWAN transceiver 1020.
  • the sidelink transceiver 1010 is coupled to one or more antennas 1012
  • the WWAN transceiver 1020 is coupled to one or more antennas 1022.
  • the transceivers 1010 and 1020 provide means for communicating with various other apparatus over a transmission medium.
  • the transceivers 1010 and 1020 receive signals from the one or more antennas 1012 and 1022, extract information from the received signals, and provide the extracted information to the processing system 1014.
  • the transceivers 1010 and 1020 receive information from the processing system 1014, specifically the request component 1030, and based on the received information, generate signals to be applied to the one or more antennas 1012 and 1022.
  • the transceivers 1010 and 1020 may be a single transceiver configured for both WWAN and sidelink communication.
  • the processing system 1014 includes a processor 1004 coupled to a computer-readable medium /memory 1006.
  • the processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1006.
  • the software when executed by the processor 1004, causes the processing system 1014 to perform the various functions described above for the low-tier UE 406.
  • the computer-readable medium /memory 1006 may also be used for storing data that is manipulated by the processor 1004 when executing software.
  • the processing system 1014 may be a component of the UE 204 of FIG. 2 and may include the memory 260, and/or at least one of the TX processor 268, the RX processor 256, and the controller/processor 259.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module may reside in random access memory (RAM) , flash memory, read-only memory (ROM) , erasable programmable ROM (EPROM) , electrically erasable programmable ROM (EEPROM) , registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal (e.g., UE) .
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des techniques de communication sans fil sont divulguées. Selon un aspect, un premier UE reçoit, à partir d'un second UE sur une connexion de liaison latérale entre le premier UE et le second UE, une demande d'envoi, provenant du second UE et destinée au premier UE, d'une demande de configuration de ressource de liaison montante à une station de base desservant le second UE. Le premier UE transmet la demande de configuration de ressources de liaison montante à la station de base, et reçoit, en provenance de la station de base, la configuration de ressources de liaison montante pour le second UE. Le premier UE transmet ensuite, sur la connexion de liaison latérale, la configuration de ressource de liaison montante au second UE. Le second UE peut alors transmettre, à la station de base, des données de liaison montante à l'aide de la configuration de ressources de liaison montante.
PCT/CN2019/122885 2019-12-04 2019-12-04 Demande de ressource de liaison montante rapide basée sur une assistance externe WO2021109013A1 (fr)

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