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WO2017196416A1 - Durée de report pour la liaison montante écoute avant parole - Google Patents

Durée de report pour la liaison montante écoute avant parole Download PDF

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Publication number
WO2017196416A1
WO2017196416A1 PCT/US2017/016989 US2017016989W WO2017196416A1 WO 2017196416 A1 WO2017196416 A1 WO 2017196416A1 US 2017016989 W US2017016989 W US 2017016989W WO 2017196416 A1 WO2017196416 A1 WO 2017196416A1
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WO
WIPO (PCT)
Prior art keywords
channel
duration
priority class
circuitry
access priority
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2017/016989
Other languages
English (en)
Inventor
Jeongho Jeon
Seunghee Han
Hwan-Joon Kwon
Vikram Chandrasekhar
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Intel IP Corp
Original Assignee
Intel IP Corp
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.)
Filing date
Publication date
Application filed by Intel IP Corp filed Critical Intel IP Corp
Priority to CN201780023807.9A priority Critical patent/CN109076605B/zh
Publication of WO2017196416A1 publication Critical patent/WO2017196416A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the present disclosure generally relates to the use of unlicensed spectrum. Since unlicensed spectrum can be used by various users without any centralized scheduling, access procedures are used for accessing the unlicensed spectrum in a fair manner.
  • Wireless mobile communication technology enables communication of mobile user equipment devices, such as smartphones, tablet computing devices, laptop computers, and the like.
  • Mobile communication technology may enable connectivity of various types of devices.
  • Wireless mobile communication technology uses radio spectrum for communication.
  • Spectrum can either be licensed spectrum or unlicensed spectrum. Access to licensed spectrum is limited to the licensee (and those that they allow to use the licensed spectrum, for example). Access to unlicensed spectrum on the other hand is generally available to any user subject to certain contention access procedures.
  • Wireless mobile communication technology uses various standards and protocols to transmit data between a base station and a wireless communication device.
  • Wireless wide area network (WWAN) communication system standards and protocols can include, for example, the 3rd Generation Partnership Project (3GPP) long term evolution (LTE), and the IEEE 802.16 standard, which is commonly known to industry groups as worldwide interoperability for microwave access (WiMAX).
  • Wireless local area network (WLAN) can include, for example, the IEEE 802.1 1 standard, which is commonly known to industry groups as Wi-Fi.
  • Other WWAN and WLAN standards and protocols are also known.
  • WWAN communication systems generally operate using licensed spectrum while WLAN communication systems generally operate using unlicensed spectrum. Since licensed spectrum is limited, there is considerable interest in utilizing both licensed spectrum and unlicensed spectrum for wireless communications.
  • FIG. 1 is a block diagram illustrating an example of an uplink (UL) burst transmission that implements the present systems and methods.
  • FIG. 2 is a flow diagram of a method for a category 4 LBT (e.g., Cat. 4 LBT) device to access a channel.
  • a category 4 LBT e.g., Cat. 4 LBT
  • FIG. 3 is a flow diagram of a method for accessing a channel.
  • FIG. 4 is a flow diagram of a method for accessing a channel.
  • FIG. 5 is a flow diagram of a method for accessing a channel.
  • FIG. 6 is a block diagram illustrating electronic device circuitry that may be evolved Node B (eNB) circuitry, user equipment (UE) circuitry, network node circuitry, or some other type of circuitry in accordance with various embodiments.
  • eNB evolved Node B
  • UE user equipment
  • FIG. 7 is a block diagram illustrating, for one embodiment, example components of a UE, mobile station (MS) device, or eNB.
  • MS mobile station
  • eNB evolved Node B
  • an Evolved Universal Terrestrial Radio Access Network may include one or more base stations, which are called E-UTRAN Node Bs (also commonly denoted as evolved Node Bs, enhanced Node Bs, eNodeBs, or eNBs) and/or Radio Network Controllers (RNCs).
  • E-UTRAN Node Bs also commonly denoted as evolved Node Bs, enhanced Node Bs, eNodeBs, or eNBs
  • RNCs Radio Network Controllers
  • one or more eNBs may communicate with one or more wireless communication devices, known as user equipments (UEs).
  • UEs user equipments
  • An evolved packet core (EPC) may communicatively couple the E-UTRAN to an external network, such as the internet.
  • LTE networks include radio access technologies (RATs) and core radio network architecture that can provide high data rate, low latency, packet optimization, and improved system capacity and coverage.
  • RATs radio access technologies
  • core radio network architecture that can provide high data rate, low latency
  • LTE uses licensed spectrum.
  • One of the challenges associated with licensed spectrum is that the usable licensed spectrum is often limited (bandwidth limited, for example). These limitations have led to the exploration of using both licensed spectrum and unlicensed spectrum for wireless communication.
  • unlicensed spectrum is enabled at least in part because of the rise in homogeneous networks.
  • a node also called a macro node or macro cell
  • the cell may be the area in which the wireless devices can communicate with the macro node.
  • Heterogeneous networks HetNets may be used to handle the increased traffic loads on the macro nodes due to increased usage and functionality of wireless devices.
  • HetNets may include a layer of planned high power macro nodes (macro-eNBs or macro cells) overlaid with layers of lower power nodes (small cells, small-eNBs, micro-eNBs, pico-eNBs, femto-eNBs, or home eNBs (HeNBs)) that may be deployed in a less well-planned or even entirely uncoordinated manner within the coverage area (cell) of a macro node.
  • the lower power nodes may generally be referred to as "small cells,” small nodes, or low power nodes.
  • HetNets may also include various types of nodes utilizing varying types of RATs, such as LTE eNBs, 3G NodeBs, Wi-Fi APs, and WiMAX base stations.
  • LTE eNBs LTE eNBs
  • 3G NodeBs 3G NodeBs
  • Wi-Fi APs Wi-Fi APs
  • WiMAX base stations such as Wi-Fi APs, WiMAX base stations.
  • one or more high power macro nodes may utilize licensed spectrum (e.g., LTE over licensed
  • one or more lower power nodes may utilize unlicensed spectrum (e.g., LTE over unlicensed spectrum).
  • unlicensed spectrum e.g., LTE over unlicensed spectrum
  • node and “cell” are both intended to be synonymous and refer to a wireless transmission point operable to
  • cells or nodes may also be Wi-Fi access points (APs), or multi-radio cells with Wi-Fi/cellular or additional RATs.
  • APs Wi-Fi access points
  • nodes or cells may include various technologies such that cells operating on different RATs are integrated in one unified HetNet.
  • LTE Long Term Evolution
  • LAA LAA
  • the unlicensed frequency band of initial interest in 3GPP is the 5
  • the 5 GHz band is governed by Federal Communications
  • ETSI Telecommunications Standards Institute
  • EP European Telecommunications Standards Institute
  • WLAN Wireless Local Area Network
  • LBT Listen-Before-Talk
  • LBT is a procedure whereby radio transmitters first sense the
  • 3GPP Release 13 LAA mainly focused on enabling downlink (DL) access using both licensed spectrum and unlicensed spectrum via carrier
  • the main design goal of 3GPP Release 14 enhanced LAA is to specify UL support for LAA Secondary Cell (SCell) operation in unlicensed spectrum.
  • the specification of UL support for LAA SCell shall encompass the design of the Sounding Reference Signal (SRS), the Physical Uplink Shared Channel (PUSCH), and possibly the Physical Uplink Control Channel (PUCCH) and the Physical Random Access Channel (PRACH), if supported.
  • SRS Sounding Reference Signal
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • the present systems and methods are directed to specifying a defer period for UL LBT. It is to be appreciated that the defer period for UL LBT is different than the defer period for DL LBT.
  • LBT was specified including a defer duration (T d ) (based on the value of m p , for example) for each channel access priority class (p).
  • T d defer duration
  • T d duration (microseconds ( ⁇ ))
  • T si 9 ⁇ s
  • 7 ⁇ includes an idle slot duration T si at the start of the Tf.
  • the DL defer duration T d is based on the value of m p and the value of m p is dependent upon the channel access priority class (p).
  • consecutive slot durations for DL LBT depends on the channel access priority class (p) as illustrated in Table 1 , which is a reproduction of Table 15.1 .1 -1 in 3GPP Technical Specification (TS) 36.213 V13.0.1 .
  • Table 1 specifies the minimum contention window size ⁇ CW min p ), the maximum contention window size ⁇ CW max p ), the maximum channel occupancy time Cr mcot p ), and the allowed contention window sizes ⁇ CWp) to be used with each channel access priority class (p) for DL LBT.
  • the present systems and methods are directed to specifying the parameters for UL support for eLAA operation in unlicensed spectrum.
  • the present systems and methods are directed to
  • the UL defer duration T d is based on the value of m p and the
  • m p is dependent upon the channel access priority class (p).
  • the m p consecutive slot durations for UL LBT depends on the channel access priority class (p) as illustrated in Table 2.
  • the specified m p consecutive slot durations for UL LBT is 2 when the channel access priority class (p) is 1 or 2. This is different than the m p consecutive slot durations for DL LBT.
  • Table 2 specifies the minimum contention window size ⁇ CW min p ), the maximum contention window size ⁇ CW max p ), the maximum UL channel occupancy time (r uimcot p ), and the allowed contention window sizes ⁇ CW p ) to be used with each channel access priority class (p) for UL LBT.
  • WLAN is the Arbitration Inter-Frame Spacing (AIFS) duration for a particular Access Category (AC) (AIFS[AC]) and the analog of the LTE m p in WLAN is the AIFS-number (AIFSN[AC]).
  • the value of AIFSN[AC] shall be greater than or equal to 2 for non-AP Quality of Service (QoS) Stations (QSTAs) and the value of AIFSN[AC] shall be greater than or equal to 1 for QoS APs (QAPs).
  • QoS Quality of Service
  • QAP QoS AP
  • the IEEE Std. 802.1 1 eTM- 2005 Amendment 8 provides that the default configuration for STAs is
  • AIFSN ⁇ 2, 2, 3, 7 ⁇ for access priority classes 1 to 4 respectively.
  • the 3GPP Release 13 LAA design of the DL defer duration T d is in accordance with the default configuration for QAPs and the proposed 3GPP Release 14 eLAA design of the UL defer duration T d is in accordance with the default configuration for QSTAs. Therefore the DL defer duration T d and the proposed UL defer duration T d honor the incumbent WLAN systems so as to enable fair competition in channel access.
  • the described systems and methods relate to specifying that the number of consecutive time slots (e.g., m p ) is 2 when the channel access priority class (p) is 1 or 2. In some embodiments, the number of consecutive time slots (e.g., m p ) is greater than or equal to 2 when the channel access priority class (p) is 1 or 2.
  • FIG. 1 is a block diagram illustrating an example of an UL burst transmission 100 that implements the present systems and methods.
  • a device such as a UE, for example, may have an LAA UL burst 150 to transmit.
  • the device may monitor a channel 155 and may wait until the channel 155 is clear before transmitting the LAA UL burst 150.
  • the channel 155 may be busy 105 for a period of time.
  • the device may sense the channel 155 to determine when the channel 155 becomes idle (e.g., not busy 105).
  • the device may wait for a defer duration (T d ) 120, which consists of a first channel sense duration (T f ) 1 10 and a second channel sense duration ⁇ m p T sl ) 125, before initiating a contention procedure (e.g., backoff duration 130). If the channel 155 is idle for both the defer duration (T d ) 120 and the backoff duration 130 (subject to contention access procedures, for example) then the device may transmit the LAA UL burst 150 on the channel 155.
  • T d defer duration
  • the first channel sense duration (T f ) 1 10 may have a fixed duration of 16 s.
  • the second channel sense duration ⁇ m p T sl ) 1 15 may have a variable duration that is dependent on m p and ⁇ 5 ⁇ where T si is an enhanced clear channel access (eCCA) slot time (T si ) 125, which has a fixed duration 9 s, and where m p is an integer that specifies the number of consecutive eCCA slot times (T si ) 125 that the second channel sense duration 1 15 should be.
  • eCCA enhanced clear channel access
  • T si enhanced clear channel access
  • m p is an integer that specifies the number of consecutive eCCA slot times (T si ) 125 that the second channel sense duration 1 15 should be.
  • m p is dependent on the channel access priority class (p) as set forth in Table 2.
  • the channel 155 is idle for the defer duration (T d ) 120, then immediately following (e.g., consecutive to) the defer duration (T d ) 120, a contention access procedure is initiated.
  • the contention access procedure is known to those in the art and is only described briefly herein. The contention access procedure provides fair access to the channel 155 and helps mitigate and address collisions during contention access.
  • the device selects a random number N (e.g., uniformly random N) from the range of 0 to contention window (CW p ) 135 where CW p 135 is the size of the contention window in terms of the eCCA slot time (T sl ) 125, which in this case (e.g., channel access priority class 1 ) can either be 3 eCCA slot times (T sl ) 125 (e.g., CW min , p 140) or 7 eCCA slot times (T sl ) 125 (e.g., CW max , p 145) as set forth in Table 2.
  • Contention access procedures define an algorithm for decrementing N.
  • N is decremented for each eCCA slot time ⁇ T sl ) 125 following the defer duration (T d ) 120.
  • N 2 so the backoff duration 130 is 2 eCCA slot times (T sl ) 125 (this assumes no interference from other devices, for example).
  • the device transmits the LAA UL burst 150.
  • different channel access priority classes (p) have a plurality of different maximum channel occupancy times ⁇ T ulmcot p ) 175.
  • the maximum channel occupancy time (T u i mcotiP ) 175 is 2 ms. This corresponds to 2 LTE subframes, which have a subframe timing 165 of 1 ms per subframe.
  • the LAA UL burst 150 may include one or more Physical Uplink Shared Channel (PUSCH) subframes 170.
  • PUSCH Physical Uplink Shared Channel
  • the LAA UL burst 150 includes a first PUSCH subframe 170-a and a second PUSCH subframe 170-b.
  • the subframe timing 165 associated with the first and second PUSCH subframes 170 may be in sequence with one or more SCell subframe boundaries 160 associated with the channel 155.
  • the duration of the second channel sense duration 1 15 is variable based on the value of m p , and the value of m p is dependent upon the access channel priority class (p) as set forth in Table 2.
  • FIG. 2 is a flow diagram of a method 200 for a category 4 LBT (e.g., Cat. 4 LBT) device to access a channel.
  • a Cat. 4 LBT device may be a UE that is capable of supporting both UL and DL LAA burst transmissions.
  • the method begins and the channel is sensed.
  • an integer value for N is randomly selected from a range of 0 to CWp where each integer in the range of 0 to CW p has a uniform probability of being selected.
  • the channel is sensed at 240.
  • a determination is made as to whether (C1 ) the channel is sensed busy for a slot time (T si ) or (C2) the
  • T d a defer duration
  • the method 200 requires that the channel be idle for at least the defer duration (T d ) before any backoff duration (e.g., N,
  • FIG. 3 is a flow diagram of a method 300 for accessing a channel.
  • the method 300 is performed by a device, such as a UE or the like.
  • the method 300 may be performed by a processor (e.g., a baseband processor) within the device.
  • a processor e.g., a baseband processor
  • FIG. 3 is a flow diagram of a method 300 for accessing a channel.
  • the method 300 is performed by a device, such as a UE or the like.
  • the method 300 may be performed by a processor (e.g., a baseband processor) within the device.
  • a processor e.g., a baseband processor
  • a channel access priority class (p) of an uplink communication is identified.
  • a number (m p ) of slot durations (T sl ) to use as a second channel sense duration ⁇ m p T sl ) is determined, where the number (m p ) is based on the identified channel access priority class.
  • the number (m p ) is at least 2.
  • the channel is sensed for a defer duration (T d ) that includes a first channel sensing duration (T f ) and the second channel sensing duration (m p T sl ).
  • access to the channel for uplink communication is allowed when the channel is sensed to be idle for the defer duration (T d ) and any backoff duration.
  • the operations of the method 300 may be performed by an application specific processor, programmable application specific integrated circuit (ASIC), field programmable gate array (FPGA), or the like.
  • ASIC programmable application specific integrated circuit
  • FPGA field programmable gate array
  • FIG. 4 is a flow diagram of a method 400 for accessing a channel.
  • the method 400 is performed by a device, such as a UE, or the like.
  • the method 400 may be performed by a processor (e.g., a baseband processor) within the device.
  • a processor e.g., a baseband processor
  • FIG. 4 is a flow diagram of a method 400 for accessing a channel.
  • the method 400 is performed by a device, such as a UE, or the like.
  • the method 400 may be performed by a processor (e.g., a baseband processor) within the device.
  • a processor e.g., a baseband processor
  • an uplink message to be sent on a channel is identified.
  • the channel access priority class (p) of the uplink message is channel access priority class 1 .
  • the channel is sensed for a defer duration (T d ) that consists of a channel sensing duration (T f ) and a number of consecutive slots (m p ) that have a slot duration (T si ).
  • the number of consecutive slots (m p ) is at least two for channel access priority class 1 uplink messages.
  • the channel is determined to be idle for the defer duration (T d ) before contending for access to the channel.
  • the operations of the method 400 may be performed by an application specific processor, programmable ASIC, FPGA, or the like.
  • FIG. 5 is a flow diagram of a method 500 for accessing a channel.
  • the method 500 is performed by a device, such as a UE, or the like.
  • the method 500 may be performed by a processor (e.g., a baseband processor) within the device.
  • a processor e.g., a baseband processor
  • FIG. 5 is a flow diagram of a method 500 for accessing a channel.
  • the method 500 is performed by a device, such as a UE, or the like.
  • the method 500 may be performed by a processor (e.g., a baseband processor) within the device.
  • a processor e.g., a baseband processor
  • an uplink message to be sent on a channel is identified.
  • the channel access priority class (p) of the uplink message is channel access priority class 2.
  • the channel is sensed for a defer duration (T d ) that consists of a channel sensing duration (T f ) and a number of consecutive slots (m p ) that have a slot duration (T sl ).
  • the number of consecutive slots (m p ) is at least two for channel access priority class 2 uplink messages.
  • the channel is determined to be idle for the defer duration (T d ) before contending for access to the channel.
  • the operations of the method 500 may be performed by an application specific processor, programmable ASIC, FPGA, or the like.
  • FIG. 6 is a block diagram illustrating an electronic device circuitry 600 that may be eNB circuitry, UE circuitry, network node circuitry, or some other type of circuitry in accordance with various embodiments.
  • the electronic device circuitry 600 may be, or may be incorporated into or otherwise a part of, an eNB, a UE, an MS, a base transceiver station (BTS), a network node, or some other type of electronic device.
  • the electronic device circuitry 600 may include a radio transmit circuitry 605 and a receive circuitry 610 coupled to a control circuitry 615.
  • the transmit circuitry 605 and/or the receive circuitry 610 may be elements or modules of transceiver circuitry, as shown.
  • the electronic device circuitry 600 may be coupled with one or more antenna elements 620 of one or more antennas.
  • the electronic device circuitry 600 and/or the components of the electronic device circuitry 600 may be configured to perform operations similar to those described elsewhere in this disclosure.
  • the transmit circuitry 605 can transmit an SCell UL LAA message, as shown in FIG. 1.
  • the receive circuitry 610 can receive an SCell DL LAA message.
  • the transmit circuitry 605 can transmit an SCell DL LAA message.
  • the receive circuitry 610 can receive an SCell UL LAA message as shown in FIG. 1.
  • the electronic device circuitry 600 shown in FIG. 6 is operable to perform one or more methods, such as the methods shown in FIGS. 3- 5.
  • circuitry may refer to, be part of, or include an ASIC, an electronic circuit, a processor (shared, dedicated, or
  • circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware.
  • FIG. 7 is a block diagram illustrating, for one embodiment, example components of a UE, an MS device, or an evolved Node B (eNB) 700.
  • the UE device 700 may include application circuitry 705, baseband circuitry 710, radio frequency (RF) circuitry 715, front-end module (FEM) circuitry 720, and one or more antennas 725, coupled together at least as shown in FIG. 7.
  • RF radio frequency
  • FEM front-end module
  • the application circuitry 705 may include one or more application processors.
  • the application circuitry 705 may include one or more single-core or multi-core processors.
  • the processor(s) may include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, etc.).
  • the processor(s) may be operably coupled and/or include memory/storage, and may be configured to execute instructions stored in the memory/storage to enable various applications
  • the baseband circuitry 710 may include one or more single-core or multi-core processors.
  • the baseband circuitry 710 may include one or more baseband processors and/or control logic.
  • the baseband circuitry 710 may be configured to process baseband signals received from a receive signal path of the RF circuitry 715.
  • the baseband circuitry 710 may also be configured to generate baseband signals for a transmit signal path of the RF circuitry 715.
  • the baseband circuitry 710 may interface with the application circuitry 705 for generation and processing of the baseband signals, and for controlling operations of the RF circuitry 715.
  • the baseband circuitry 710 may include at least one of a second generation (2G) baseband processor 71 OA, a third generation (3G) baseband processor 710B, a fourth generation (4G) baseband processor 710C, one or more other baseband processor(s) 710D for other existing generations, and generations in development or to be developed in the future (e.g., fifth generation (5G), sixth generation (6G), etc.).
  • the baseband circuitry 710 (e.g., at least one of the baseband processors 710A-710D) may handle various radio control functions that enable communication with one or more radio networks via the RF circuitry 715.
  • the radio control functions may include signal modulation/demodulation, encoding/decoding, radio frequency shifting, other functions, and combinations thereof.
  • the radio control functions may include signal modulation/demodulation, encoding/decoding, radio frequency shifting, other functions, and combinations thereof.
  • modulation/demodulation circuitry of the baseband circuitry 710 may be programmed to perform Fast-Fourier Transform (FFT), precoding, constellation
  • encoding/decoding circuitry of the baseband circuitry 710 may be programmed to perform convolutions, tail-biting convolutions, turbo, Viterbi, Low Density Parity Check (LDPC) encoder/decoder functions, other functions, and combinations thereof.
  • LDPC Low Density Parity Check
  • encoder/decoder functions are not limited to these examples, and may include other suitable functions.
  • the baseband circuitry 710 may include elements of a protocol stack.
  • elements of an evolved universal terrestrial radio access network (E-UTRAN) protocol including, for example, physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), and/or radio resource control (RRC) elements.
  • a central processing unit (CPU) 71 OE of the baseband circuitry 710 may be programmed to run elements of the protocol stack for signaling of the PHY, MAC, RLC, PDCP and/or RRC layers.
  • the baseband circuitry 710 may include one or more audio digital signal processor(s) (DSP) 71 OF.
  • the audio DSP(s) 71 OF may include elements for compression/decompression and echo cancellation.
  • the audio DSP(s) 71 OF may also include other suitable processing elements.
  • the baseband circuitry 710 may further include a memory/storage 710G.
  • the memory/storage 710G may include data and/or instructions for operations performed by the processors of the baseband circuitry 710 stored thereon.
  • the memory/storage 710G may include any combination of suitable volatile memory and/or non-volatile memory.
  • the memory/storage 710G may also include any combination of various levels of memory/storage including, but not limited to, read-only memory (ROM) having embedded software instructions (e.g., firmware), random access memory (e.g., dynamic random access memory (DRAM)), cache, buffers, etc.
  • ROM read-only memory
  • DRAM dynamic random access memory
  • the memory/storage 710G may be shared among the various processors or dedicated to particular processors.
  • the baseband circuitry 710 may additionally include a Wi-Fi processor 71 OH for handling WLAN communication, including LTE communication over unlicensed spectrum that is traditionally occupied by Wi-Fi.
  • the Wi-Fi processor 71 OH may be coupled to a Wi-Fi RF circuitry 730, a Wi-Fi FEM circuitry 735, and a Wi-Fi antenna 740. These components may be colocated with the respective RF circuitry 715, FEM circuitry 720, and/or the antennas 725 or may be separately located (as shown).
  • the Wi-Fi specific hardware e.g., 730-740
  • Components of the baseband circuitry 710 may be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some
  • some or all of the constituent components of the baseband circuitry 710 and the application circuitry 705 may be
  • SOC system on a chip
  • the baseband circuitry 710 may provide for communication compatible with one or more radio technologies.
  • the baseband circuitry 710 may support communication with an evolved universal terrestrial radio access network (E-UTRAN) and/or other wireless metropolitan area networks (WMAN), a WLAN, or a wireless personal area network (WPAN).
  • E-UTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless personal area network
  • WPAN wireless personal area network
  • the RF circuitry 715 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • the RF circuitry 715 may include switches, filters, amplifiers, etc., to facilitate the communication with the wireless network.
  • the RF circuitry 715 may include a receive signal path which may include circuitry to down-convert RF signals received from the FEM circuitry 720, and provide baseband signals to the baseband circuitry 710.
  • the RF circuitry 715 may also include a transmit signal path which may include circuitry to up-convert baseband signals provided by the baseband circuitry 710, and provide RF output signals to the FEM circuitry 720 for
  • the RF circuitry 715 may include a receive signal path and a transmit signal path.
  • the receive signal path of the RF circuitry 715 may include a mixer circuitry 715A, an amplifier circuitry 715B, and a filter circuitry 715C.
  • the transmit signal path of the RF circuitry 715 may include the filter circuitry 715C and the mixer circuitry 715A.
  • the RF circuitry 715 may further include a synthesizer circuitry 715D configured to synthesize a frequency for use by the mixer circuitry 715A of the receive signal path and the transmit signal path.
  • the mixer circuitry 715A of the receive signal path may be configured to down- convert RF signals received from the FEM circuitry 720 based on the synthesized frequency provided by the synthesizer circuitry 715D.
  • the amplifier circuitry 715B may be configured to amplify the down-converted signals.
  • the filter circuitry 715C may include a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals.
  • LPF low-pass filter
  • BPF band-pass filter
  • Output baseband signals may be provided to the baseband circuitry 710 for further processing.
  • the output baseband signals may include zero-frequency baseband signals, although this is not a requirement.
  • the mixer circuitry 715A of the receive signal path may comprise passive mixers, although the scope of the embodiments is not limited in this respect.
  • the mixer circuitry 715A of the transmit signal path may be configured to up-convert input baseband signals based on the synthesized frequency provided by the synthesizer circuitry 715D to generate RF output signals for the FEM circuitry 720.
  • the baseband signals may be provided by the baseband circuitry 710 and may be filtered by the filter circuitry 715C.
  • the filter circuitry 715C may include a low-pass filter (LPF), although the scope of the embodiments is not limited in this respect.
  • the mixer circuitry 715A of the receive signal path and the mixer circuitry 715A of the transmit signal path may include two or more mixers, and may be arranged for quadrature downconversion and/or upconversion, respectively.
  • the mixer circuitry 715A of the receive signal path and the mixer circuitry 715A of the transmit signal path may include two or more mixers and may be arranged for image rejection (e.g., Hartley image rejection).
  • the mixer circuitry 715A of the receive signal path and the mixer circuitry 715A of the transmit signal path may be arranged for direct downconversion and/or direct upconversion, respectively.
  • the mixer circuitry 715A of the receive signal path and the mixer circuitry 715A of the transmit signal path may be configured for super-heterodyne operation.
  • the output baseband signals and the input baseband signals may be analog baseband signals, although the scope of the embodiments is not limited in this respect.
  • the output baseband signals and the input baseband signals may be digital baseband signals.
  • the RF circuitry 715 may include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry, and the baseband circuitry 710 may include a digital baseband interface to communicate with the RF circuitry 715.
  • ADC analog-to-digital converter
  • DAC digital-to-analog converter
  • separate radio integrated circuit (IC) circuitry may be provided for processing signals for each spectrum, although the scope of the embodiments is not limited in this respect.
  • the synthesizer circuitry 715D may include one or more of a fractional-N synthesizer and a fractional N/N+1 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers may be suitable.
  • the synthesizer circuitry 715D may include a delta-sigma synthesizer, a frequency multiplier, a synthesizer comprising a phase-locked loop with a frequency divider, other synthesizers, and combinations thereof.
  • the synthesizer circuitry 715D may be configured to synthesize an output frequency for use by the mixer circuitry 715A of the RF circuitry 715 based on a frequency input and a divider control input. In some embodiments, the synthesizer circuitry 715D may be a fractional N/N+1 synthesizer.
  • frequency input may be provided by a voltage controlled oscillator (VCO), although that is not a requirement.
  • VCO voltage controlled oscillator
  • Divider control input may be provided by either the baseband circuitry 710 or the application circuitry 705 depending on the desired output frequency.
  • a divider control input (e.g., N) may be determined from a look-up table based on a channel indicated by the application circuitry 705.
  • the synthesizer circuitry 715D of the RF circuitry 715 may include a divider, a delay-locked loop (DLL), a multiplexer, and a phase accumulator.
  • the divider may include a dual modulus divider (DMD)
  • the phase accumulator may include a digital phase accumulator (DPA).
  • the DMD may be configured to divide the input signal by either N or N+1 (e.g., based on a carry out) to provide a fractional division ratio.
  • the DLL may include a set of cascaded, tunable, delay elements, a phase detector, a charge pump, and a D-type flip-flop.
  • the delay elements may be configured to break a VCO period into N d equal packets of phase, where N d is the number of delay elements in the delay line. In this way, the DLL may provide negative feedback to help ensure that the total delay through the delay line is one VCO cycle.
  • the synthesizer circuitry 715D may be configured to generate a carrier frequency as the output frequency.
  • the output frequency may be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency, etc.) and used in conjunction with a quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other.
  • the output frequency may be a local oscillator (LO) frequency (fLO).
  • the RF circuitry 715 may include an IQ/polar converter.
  • the FEM circuitry 720 may include a receive signal path which may include circuitry configured to operate on RF signals received from one or more antennas 725, amplify the received signals, and provide the amplified versions of the received signals to the RF circuitry 715 for further processing.
  • the FEM circuitry 720 may also include a transmit signal path which may include circuitry configured to amplify signals for transmission provided by the RF circuitry 715 for transmission by at least one of the antennas 725.
  • the FEM circuitry 720 may include a TX/RX switch configured to switch between a transmit mode and a receive mode operation.
  • the FEM circuitry 720 may include a receive signal path and a transmit signal path.
  • the receive signal path of the FEM circuitry 720 may include a low-noise amplifier (LNA) to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry 715).
  • LNA low-noise amplifier
  • the transmit signal path of the FEM circuitry 720 may include a power amplifier (PA) configured to amplify input RF signals (e.g., provided by the RF circuitry 715), and one or more filters configured to generate RF signals for subsequent transmission (e.g., by one or more of the antennas 725).
  • PA power amplifier
  • the MS device 700 may include additional elements such as, for example, memory/storage, a display, a camera, one or more sensors, an input/output (I/O) interface, other elements, and combinations thereof.
  • additional elements such as, for example, memory/storage, a display, a camera, one or more sensors, an input/output (I/O) interface, other elements, and combinations thereof.
  • the MS device 700 may be configured to perform one or more processes, techniques, and/or methods as described herein, or portions thereof.
  • Example 1 is an apparatus for a user equipment.
  • the apparatus includes circuitry to detect energy on a channel of a license-assisted access (LAA) secondary cell (SCell).
  • the apparatus also includes one or more baseband processing units to identify a channel access priority class (p) of an uplink communication.
  • the apparatus also includes one or more baseband processing units to determine a number of slots (m p ) that have a slot duration (T s/ ) to use as a second channel sensing duration ⁇ m p T s i), where the number of slots (m p ) is based on the identified channel access priority class, and where the number of slots (m p ) is at least two.
  • LAA license-assisted access
  • SCell secondary cell
  • the apparatus also includes one or more baseband processing units to identify a channel access priority class (p) of an uplink communication.
  • the apparatus also includes one or more baseband processing units to determine a number of slots (m p ) that have a slot duration (T
  • the one or more baseband processing units are further to sense the channel for a defer duration ( Td) that includes a first channel sensing duration (Tf) and the second channel sensing duration (m p T s i), and allow access to the channel for the uplink communication when the channel is sensed to be idle for the defer duration ( Td) and any backoff duration.
  • Td defer duration
  • Tf first channel sensing duration
  • m p T s i second channel sensing duration
  • Example 2 is the apparatus of Example 1 and/or any of the other examples described herein, where the identified channel access priority class (p) of the uplink communication is one (1 ), and where the number of slots (mi) for channel access priority class 1 is two (2).
  • Example 3 is the apparatus of Example 1 and/or any of the other examples described herein, where the identified channel access priority class (p) of the uplink communication is one (1 ), and where the number of slots (m 2 ) for channel access priority class 2 is two (2).
  • Example 4 is the apparatus of any of Examples 1 -3 and/or any of the other examples described herein, where the number of slots (m p ) are consecutive.
  • Example 5 is the apparatus of Example 4 and/or any of the other examples described herein, where the slot duration (7 S/ ) is nine (9) microseconds (MS).
  • Example 6 is the apparatus of Example 5 and/or any of the other examples described herein, where the first channel sensing duration ( T f ) is 16 s.
  • Example 7 is the apparatus of any of Examples 1 -3 and/or any of the other examples described herein, where the second channel sensing duration (m p T s i) is consecutive to the first channel sensing duration ( Tf).
  • Example 8 is the apparatus of any of Examples 1 -3 and/or any of the other examples described herein, where the backoff duration is consecutive to the defer duration ( Td).
  • Example 9 is the apparatus of any of Examples 1 -3 and/or any of the other examples described herein, where the uplink communication comprises a physical uplink shared channel (PUSCH) communication.
  • PUSCH physical uplink shared channel
  • Example 10 is the apparatus of any of Examples 1 -3 and/or any of the other examples described herein, where any backup duration is based on a random backoff counter (N).
  • Example 1 1 is an apparatus for a user equipment.
  • the apparatus includes memory to store a channel sensing duration (7» and a slot duration (T s/ ), and logic to detect energy on a channel of a license-assisted access (LAA) secondary cell (SCell).
  • LAA license-assisted access
  • the apparatus also includes one or more processing units to: identify an uplink message to be sent on a channel of a license-assisted access (LAA) secondary cell (SCell), where a channel access priority class (p) of the uplink message is channel access priority class 1 , sense the channel for a defer duration ( Td), where the defer duration ( Td) consists of the channel sensing duration (7» and a number of consecutive slots (m p ) that have the slot duration (T s/ ), where the number of consecutive slots (m p ) is at least two (2) for channel access priority class 1 uplink messages, and determine that the channel is idle for the defer duration ( Td) before contending for access to the channel.
  • LAA license-assisted access
  • Example 12 is the apparatus of Example 1 1 and/or any of the other examples described herein, where the number of consecutive slots (m p ) is two (2) for channel access priority class 1 .
  • Example 13 is the apparatus of Example 1 1 and/or any of the other examples described herein, where the one or more processing units are further to determine that the channel is available for the uplink message when the channel is idle and a random backoff counter (N) equals zero (0).
  • Example 14 is the apparatus of any of Examples 1 1 -13 and/or any of the other examples described herein, where the slot duration (T s/ ) is nine (9)
  • Example 15 is the apparatus of any of Examples 1 1 -13 and/or any of the other examples described herein, where the channel sensing duration (7» is 16 s.
  • Example 16 is a computer-readable medium.
  • the computer-readable medium having instructions stored thereon, the instructions, when executed by a computing device, cause the computing device to identify an uplink message to be sent on a channel of a license-assisted access (LAA) secondary cell (SCell), where a channel access priority class (p) of the uplink message is channel access priority class 2.
  • LAA license-assisted access
  • SCell secondary cell
  • the computer-readable medium having instructions stored thereon, the instructions, when executed by a computing device, cause the computing device to sense the channel for a defer duration ( Td), where the defer duration ( Td) consists of a channel sensing duration ( Tf) and a number of consecutive slots (m p ) that have a slot duration (7 S/ ), where the number of consecutive slots (m p ) is at least two (2) for channel access priority class 2 uplink messages, and determine that the channel is idle for the defer duration ( Td) before contending for access to the channel.
  • Example 17 is the computer-readable medium of Example 16 and/or any of the other examples described herein, where the number of consecutive slots (m p ) is two (2) for channel access priority class 2.
  • Example 18 is the computer-readable medium of Example 16 and/or any of the other examples described herein, where the one or more processing units are further to determine that the channel is available for the uplink message when the channel is idle and a random backoff counter (N) equals zero (0).
  • Example 19 is the computer-readable medium of any of Examples 16-18 and/or any of the other examples described herein, where the slot duration (7 S/ ) is nine (9) microseconds ( s).
  • Example 20 is the computer-readable medium of any of Examples 16-18 and/or any of the other examples described herein, where the channel sensing duration ( Tf) is 16 s.
  • Example 21 is a method for wireless communication.
  • the method includes identifying an uplink message to be sent on a channel of a license-assisted access (LAA) secondary cell (SCell), where a channel access priority class (p) of the uplink message is channel access priority class 2, sensing the channel for a defer duration ( T d ), where the defer duration (T d ) consists of a channel sensing duration ( Tf) and a number of consecutive slots (m p ) that have a slot duration (7 S/ ), where the number of consecutive slots (m p ) is at least two for at least one of channel access priority class 1 uplink messages and channel access priority class 2 uplink messages, and determining that the channel is idle for the defer duration ( Td) before contending for access to the channel.
  • LAA license-assisted access
  • Example 22 is the method of Example 16 and/or any of the other examples described herein, where the number of consecutive slots (m p ) is two for channel access priority class 1 .
  • Example 23 is the method of Example 16 and/or any of the other examples described herein, where the number of consecutive slots (m p ) is two for channel access priority class 2.
  • Example 24 is the method of Example 16 and/or any of the other examples described herein, where the method further includes determining that the channel is available for the uplink message when the channel is idle and a random backoff counter (N) equals zero.
  • Example 25 is the method of any of Examples 16-19 and/or any of the other examples described herein, where the slot duration ( T s/ ) is 9 microseconds (MS).
  • Example 26 is the method of any of Examples 16-19 and/or any of the other examples described herein, where the channel sensing duration (7» is 16 s.
  • Example 27 is an apparatus including means to perform any of the methods described herein.
  • Example 28 is a machine-readable storage including machine-readable instructions that when executed by a processor cause the processor to implement any method or realize any apparatus described herein.
  • Example 29 is a machine-readable medium including code, that when executed, causes a machine to perform any of the methods described herein.

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

Abstract

L'invention concerne des systèmes, des procédés et des dispositifs pour accéder à un canal sans licence d'une cellule secondaire (SCell) à accès assisté par licence (LAA) . Une classe de priorité d'accès au canal (p) d'une communication en liaison montante est identifiée. Un certain nombre de créneaux (m p ), qui ont une durée de créneau (T sl ) à utiliser en tant que seconde durée de détection de canal (m p T sl ), est déterminé. Le nombre de créneaux (m p ) est d'au moins deux et est basé sur la classe de priorité d'accès au canal identifié. Le canal est soumis à une détection de durée de report (T d ) qui comprend une première durée de détection de canal (T f ) et la seconde durée de détection de canal (m p T sl ). L'accès au canal pour la communication en liaison montante est autorisé lorsque le canal est détecté comme étant au repos pendant la durée de report (T d ) et toute durée de réduction de puissance.
PCT/US2017/016989 2016-05-13 2017-02-08 Durée de report pour la liaison montante écoute avant parole Ceased WO2017196416A1 (fr)

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