WO2017182053A1 - Procédé et dispositif d'établissement de transmission sur un canal physique prédéfini - Google Patents

Procédé et dispositif d'établissement de transmission sur un canal physique prédéfini Download PDF

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Publication number
WO2017182053A1
WO2017182053A1 PCT/EP2016/058555 EP2016058555W WO2017182053A1 WO 2017182053 A1 WO2017182053 A1 WO 2017182053A1 EP 2016058555 W EP2016058555 W EP 2016058555W WO 2017182053 A1 WO2017182053 A1 WO 2017182053A1
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WIPO (PCT)
Prior art keywords
transmission
physical channel
configuration information
free
physical resource
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PCT/EP2016/058555
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English (en)
Inventor
Long QIN
Zhao ZHAO
Qi Wang
Mingyue Zhou
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Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN201680083859.0A priority Critical patent/CN109076500A/zh
Priority to PCT/EP2016/058555 priority patent/WO2017182053A1/fr
Publication of WO2017182053A1 publication Critical patent/WO2017182053A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information

Definitions

  • the present disclosure relates to a method and a device for establishing transmission over a predefined physical channel in mobile wireless communication networks, in particular for User Equipment (UE) initiated data connections.
  • UE User Equipment
  • the present disclosure further relates to random access procedures for grant-free and Timing Adjustment (TA)- free transmission.
  • TA Timing Adjustment
  • a UE 101 , 102 carries out the so-called random access procedure before uplink data transmission to the Base Station (BS) 103.
  • the UE 101 , 102 exchanges several signalling messages with the BS 103 in order to be synchronized and/or scheduled.
  • NMMN Next Generation Mobile Networks
  • 5G White Paper Feb. 2015
  • machine-type communication It is foreseen that the number of devices that access the mobile radio network will be dramatically increased. Also, the machine-type devices differ in terms of requirements with respect to power consumption, latency and throughput etc. This poses new challenges to the next generation mobile wireless networks.
  • the state-of-the-art random access procedure aims to establish synchronous, orthogonal data transmission.
  • the uplink synchronization is obtained using the timing advance 121 , 122 which corresponds to the time a signal takes to reach the BS 103 from the UE 101 , 102.
  • a UE 101 , 102 is informed by the BS 103 about its timing advance 121 , 122 in order to adjust its timing 1 1 1 , 1 12 so that the signals from all UEs 101 , 102 are aligned at the BS 103.
  • Such a process is illustrated in Figure 1 .
  • the BS 103 grants each UE 101 , 102 a fraction 21 1 , 212 of the resource 201 , 202 and ensures that resources 21 1 , 212 for different UEs 101 , 102 are orthogonal to one another (illustrated in Figure 2).
  • data transmission can be carried out.
  • this random access scheme lie in the following two aspects: For large packet transmission, the signalling overhead required for the random access procedure can be neglected; however, for small packet transmission generated by the machine-type devices, this signalling overhead becomes significant. In addition, as the number of devices increases, the random access procedure may create huge traffic load to the network. Since the timing misalignments of different UEs are in fact the propagation delays which the electromagnetic signal travels from the base station 103 to the UEs 101 , 102, as the UEs move in high velocity, there exists higher probability that the
  • a basic idea of the invention is to provide a novel random access procedure which allows TA-free and grant-free transmission.
  • the timing adjustment is carried out either in an open-loop or in an "on request" manner.
  • the new approach simplifies the existing random access procedure and can be applied to massive machine-type communications.
  • Radio signals may be or may include radio frequency signals radiated by a radio transmitting device (or radio transmitter or sender) with a radio carrier frequency lying in a range of about 3 Hz to 300 GHz.
  • the frequency range may correspond to frequencies of alternating current electrical signals used to produce and detect radio waves.
  • OFDM and OFDMA are schemes for encoding digital data on multiple carrier frequencies.
  • a large number of closely spaced orthogonal sub-carrier signals may be used to carry data. Due to the orthogonality of the sub-carriers crosstalk between sub-carriers may be
  • the devices described herein may be applied in 802.1 1 ax systems.
  • control mechanisms like random access (RA), acknowledgment (ACK), association request etc., are applied immediately after a trigger frame (TF) that is transmitted by the access point (AP) or base station (BS).
  • a trigger frame that is transmitted by the access point (AP) or base station (BS).
  • STAs stations
  • UEs User Equipments
  • a Trigger Frame may be followed by one or more uplink (UL) frames, where each frame comprises a control signal transmitted by one or more UEs.
  • Random access is a procedure that allows client type communication devices to request from an access point (AP) type communication device resources for transmission by use of a resource request and by another procedure to initiate an association procedure with the AP.
  • this mechanism is usually applied by the client type communication devices that need to request the resources.
  • the client type communication devices can achieve an association with a specific AP.
  • RA is applied immediately after a trigger frame (TF), which is transmitted by the AP.
  • TF trigger frame
  • a TF frame may be followed by several RA opportunities. Within each opportunity, clients can try to access the channel. For doing so they contend with each other.
  • the devices described herein may be configured to perform contention-based 300 or non- contention-based 400 random access, e.g. according to 3GPP TS 36.300 Release 12, 2014-09.
  • the random access procedure in LTE comes in two forms, allowing access to be either contention based or non-contention based.
  • a UE acquires time and frequency synchronization 303 with a cell and decodes the Master Information Block (MIB) and System Information Block (SIB) 301 in the Broadcast Channel (BCH) 302 to obtain essential system information of the cell.
  • MIB Master Information Block
  • SIB System Information Block
  • BCH Broadcast Channel
  • the contention based 300 random access procedure 320 comprises the following four steps: Preamble 304 transmission, Random Access
  • RAR Layer 2/Layer 3
  • L2/L3 Layer 2/Layer 3
  • PRACH Physical Random Access Channel
  • RA random access
  • RAR Random Access Response
  • the RAR is sent by the BS 103 on the downlink shared channel (DL-SCH) 307 and addressed with an ID which identifies the time-frequency slot in which the preamble was detected.
  • DL-SCH downlink shared channel
  • the RAR 306 also conveys a timing alignment instruction to synchronize subsequent uplink transmission 321 from the UE 101 , an initial uplink resource grant for transmission of the Step 3 message, and an assignment of a Temporary Cell Radio Network Temporary Identifier (C-RNTI).
  • the Layer 2/Layer 3 (L2/L3) message 309 is the first scheduled uplink transmission on the uplink shared channel (UL-SCH) 310 and makes use of Hybrid Automatic Repeat request (HARQ). It conveys the actual RA procedure message, such as an RRC connection request 309, tracking area update, or scheduling request.
  • the contention resolution message 31 1 is addressed to the C-RNTI or Temporary C- RNTI. Upon Reception of this message 312, the UE 101 decides if a positive
  • ACKnowledgement (ACK) should be sent.
  • the non-contention based 400 random access procedure 420 is performed. Instead of a randomly selected RA preamble 304, a dedicated preamble 403 is allocated 401 to the UE 101 via dedicated signalling 402 in DL. Then the assigned preamble 403 is transmitted 305.
  • the step 2 in contention based (RAR, 306) is carried out to obtain uplink
  • AP Access Point, also base station
  • OFDM Orthogonal Frequency Division Multiplexing
  • CP-OFDM Cyclic Prefix Orthogonal Frequency Division Multiplexing
  • P-OFDM Pulse-shaped Orthogonal Frequency Division Multiplexing
  • MIMO Multiple Input Multiple Output
  • UE User Equipment
  • SIB System Information Block
  • MIB Management Information Block
  • DL-SCH Downlink shared channel
  • RACH Random Access Channel
  • PRACH Physical Random Access Channel
  • C-RNTI Cell Radio Network Temporary Identifier
  • UL-SCH Uplink Shared Channel
  • L2/L3 Layer 2/Layer 3 according to the OSI model communication standard
  • PUSCH Physical Uplink Shared Channel
  • PRB Physical Resource Block, physical resources in time and frequency
  • SDMA Space Division Multiple Access
  • FDD Frequency Division Duplex
  • the invention relates to a method for establishing data transmission over a predefined physical channel, the method comprising: broadcasting, by a base station, configuration information of a predefined physical channel wherein the configuration information comprises physical resource allocation and transmit parameters; receiving, by a user equipment, UE, the configuration information via a downlink broadcast channel from the base station, BS; determining, by the UE, whether the UE is qualified for transmission based on the received configuration information and given capabilities of the UE; and if the UE is qualified for the transmission, selecting, by the UE, a subset of the physical resource within the pre-defined physical channel and transmitting uplink data to the BS on the selected subset of the physical resource.
  • this method provides an improved random access procedure for mobile wireless communications and can be applied in particular for high velocity communication environments and machine-type communication scenarios.
  • the uplink data comprises signaling information and payload data, wherein the payload data comprises an identifier of the UE.
  • This provides the advantage that when transporting both signaling information and payload data including the UE ID, the number of messages can be reduced. This can be advantageously applied in high velocity communication environments and machine-type communication scenarios, e.g. according to LTE standardization.
  • determining, by the UE, whether the UE is qualified for the transmission comprises: evaluating a UE category tag or a UE configuration which indicate whether the UE is qualified for the transmission.
  • the transmission comprises grant-free and timing-advance (TA)-free data transmission.
  • TA timing-advance
  • the method comprises: receiving feedback information for the transmitted uplink data from the BS; indicating a successful data transmission if the feedback information comprises an acknowledgement (ACK); repeating the selection of a subset of the physical resource within the pre-defined physical channel and the transmission of the uplink data on the selected subset of the physical resource if the feedback information comprises a non- acknowledgement (NACK) or no feedback is received; repeating the random selection of a subset of the physical resource within the pre-defined physical channel and the transmission of the uplink data until either feedback information comprising an ACK is received or a given number of retransmissions, in particular a number of retransmissions configured by the BS, is reached; and if the given number of retransmissions is reached,
  • retransmissions can be efficiently controlled.
  • Using feedback information increases data throughput because only erroneously transmitted data is retransmitted.
  • Efficiency of the transmission is improved because only non-acknowledged data is retransmitted.
  • Efficiency of the transmission is further improved due to definition of a stop criterion, i.e. a maximum number of retransmissions, which triggers a timing adjustment and
  • the method further comprises: if a timing adjustment and synchronization procedure is triggered, initiating an open-loop timing adjustment by advancing a timing for transmission of the uplink data to the BS by a pre-defined amount of time; and repeating the random selection of a subset of the physical resource within the pre-defined physical channel and the transmission of the uplink data using the advanced symbol timing for transmission of the uplink data to the BS.
  • the method further comprises: if the timing adjustment and synchronization procedure is triggered, starting a closed-loop timing adjustment by initiating a contention based random access procedure.
  • the pre-defined physical channel comprises physical resources which allow for grant-free and TA-free uplink data transmission.
  • This provides the advantage that by using grant-free and TA-free data transmission, a number of signaling messages for initiating communication between UE and BS can be reduced which speed up data transmission and increases throughput.
  • the configuration information comprises a size and allocation and transmission scheme of the pre-defined physical channel, in particular at least one of a physical resource, modulation and coding schemes, a maximum payload size and a number of allowed retransmissions.
  • the invention relates to a data transmission device for a user equipment, UE for establishing data transmission over a predefined physical channel, the data transmission device comprising: a receive module, configured to receive configuration information via a downlink broadcast channel from a base station, BS, wherein the configuration information comprises physical resource allocation and transmit parameters of the predefined physical channel; a determination module, configured to determine whether the UE is qualified for transmission based on the received
  • Such a data transmission device provides an improved random access procedure for asynchronous non-orthogonal mobile wireless communications and can be applied in particular for data transmission in high velocity communication environments and machine-type communication scenarios.
  • the transmission comprises grant-free and timing-adjustment (TA)-free data transmission.
  • TA timing-adjustment
  • the invention relates to a radio cell, comprising: a decision module configured to determine configuration information of a predefined physical channel, wherein the configuration information comprises physical resource allocation and transmit parameters of the predefined physical channel; and a broadcast transmission module configured to broadcast the configuration information via a downlink broadcast channel to at least one UE for establishing data transmission with the at least one UE over the predefined physical channel.
  • the radio cell may be a base station (BS) for supporting communication with a UE.
  • BS base station
  • the radio cell may be another UE for supporting device-to-device
  • the downlink and uplink operations are applicable to the sidelink.
  • Such a radio cell provides the advantage that by using that transmission, a number of signaling messages for initiating communication between UE and radio cell can be reduced. Hence, such a radio cell provides an improved random access procedure for mobile wireless communications and can be applied in particular for high velocity communication environments and machine-type communication scenarios.
  • the pre-defined physical channel comprises physical resources which allow for grant-free and TA-free uplink data transmission.
  • the invention relates to a transmission system, comprising: a user equipment (UE) comprising a data transmission device according to the second aspect or the implementation forms of the second aspect claim; and a radio cell according the third aspect or the implementation forms of the third aspect, wherein the transmission system is configured to establish data transmission between the UE and the radio cell over the predefined physical channel.
  • UE user equipment
  • Such a transmission system provides the advantage that by using that transmission, a number of signaling messages for initiating communication between UE and radio cell, e.g. BS or other UE, can be reduced. Hence, that transmission system provides an improved transmission and a random access procedure for mobile wireless
  • the invention relates to a computer program comprising program code for performing the method according to the first aspect or any of the implementation forms of the first aspect when executed on a computer.
  • the data transmission device is configured to trigger a timing adjustment
  • a stop criterion is defined, i.e. a maximum number of retransmissions, which triggers a timing adjustment
  • the device further comprises an open loop-timing adjustment module configured to advance a symbol timing for transmission of the uplink data to the BS by a pre-defined amount of time based on a triggering of the trigger module.
  • the contention based random access procedure comprises: randomly selecting a preamble that corresponds to transmission over a Physical Random Access Channel (PRACH).
  • PRACH Physical Random Access Channel
  • Further aspects of the invention are related to a transport/physical channel which allows grant-free access; a timing adjustment procedure which is triggered by the sync status; Random access procedures (combination of above-indicated decision module and timing adjustment procedure) which enable grant-free and TA-free access; a parameter which specifies the maximum number of grant-free retransmission allowed in the cell; and Pulse shape design that allows non-orthogonal asynchronous multiple access transmission.
  • Fig. 1 shows a schematic diagram illustrating uplink synchronization 100 using timing advance
  • Fig. 2 shows a schematic diagram illustrating an example of Orthogonal multiple access 200
  • Fig. 3 shows a schematic diagram illustrating a contention based random access procedure 300
  • Fig. 4 shows a schematic diagram illustrating a non-contention based random access procedure 400
  • Fig. 5 shows a schematic diagram illustrating a method 500 for establishing transmission over a predefined physical channel according to an implementation form
  • Fig. 6 shows a block diagram illustrating a data transmission device 600 for establishing transmission over a predefined physical channel according to an implementation form
  • Fig. 7 shows a schematic diagram illustrating a physical resource 700 including GFACH (Grant-free access channel) allocated to fixed physical resource 701 , 702, 703 according to an implementation form;
  • GFACH Grant-free access channel
  • Fig. 8 shows a schematic diagram illustrating a physical resource 800 including GFACH (Grant-free access channel) allocated to physical resource 801 , 803 by using dynamic resource allocation according to an implementation form
  • Fig. 9 shows a schematic diagram illustrating a method for performing a random access procedure 900a according to a first variant
  • Fig. 10 shows a schematic diagram illustrating a method for performing a random access procedure 900b according to a second variant
  • Fig. 1 1 shows an amplitude over time diagram illustrating different exemplary pulse shapes used for testing the random access procedures 900a and 900b;
  • Fig. 12 shows a performance diagram illustrating BLER over SNR for different OFDM configurations.
  • a corresponding device may include a unit to perform the described method step, even if such unit is not explicitly described or illustrated in the figures. Further, it is understood that the features of the various exemplary aspects described herein may be combined with each other, unless specifically noted otherwise.
  • Fig. 5 shows a schematic diagram illustrating a method 500 for establishing transmission over a predefined physical channel according to an implementation form.
  • the method 500 includes broadcasting 501 , by a base station, configuration information of a predefined physical channel wherein the configuration information comprises physical resource allocation and transmit parameters, e.g. as described below with respect to Fig. 9.
  • the method further includes receiving 502, by a user equipment, UE 101 , 102, configuration information via a downlink broadcast channel from a base station BS 103.
  • the method further includes determining 503, by the UE 101 , 102, whether the UE 101 , 102 is qualified for transmission based on the received configuration information and given capabilities of the UE 101 , 102.
  • the method further includes: if the UE 101 , 102 is qualified 503 for the transmission, selecting 504, by the UE 101 , 102, a subset of the physical resource within the predefined physical channel and transmitting uplink data to the BS 103 on the selected subset of the physical resource.
  • the subset of the physical resource 700, 800 may be a GFACH channel 701 , 702, 703 allocated to a fixed physical resource as described below with respect to Fig. 7 or a GFACH channel 801 , 803 dynamically allocated to a physical resource as described below with respect to Fig. 8.
  • the transmission may be a grant-free and/or timing adjustment (TA)-free data
  • the uplink data may include an uplink transport block which may include signaling information and uplink payload data.
  • the uplink payload data may include an identifier (ID) of the UE.
  • the method 500 may further include: receiving feedback information for the transmitted uplink data from the BS.
  • the method 500 may further include: indicating a successful data transmission if the feedback information comprises an acknowledgement (ACK); and repeating the selection of a subset of the physical resource within the predefined physical channel and the transmission of the uplink data on the selected subset of the physical resource if no feedback information is received or the feedback information comprises a non-acknowledgement (NACK).
  • ACK acknowledgement
  • NACK non-acknowledgement
  • the method 500 may further include: repeating the random selection of a subset of the physical resource within the pre-defined physical channel and the transmission of the uplink data until either feedback information comprising an ACK is received or a given number of retransmissions, in particular a number of retransmissions configured by the BS, is reached; and if the given number of retransmissions is reached, triggering a timing adjustment and synchronization procedure.
  • the method 500 may further include: if a timing adjustment and synchronization procedure is triggered, initiating an open-loop timing adjustment by advancing a symbol timing for transmission of the uplink data to the BS by a pre-defined amount of time.
  • the method 500 may further include: repeating the random selection of a subset of the physical resource within the pre-defined physical channel and the transmission of the uplink data using the advanced symbol timing for transmission of the uplink data to the BS.
  • the method 500 may further include: if the timing adjustment and synchronization procedure is triggered, starting a closed-loop timing adjustment by initiating a contention based random access procedure.
  • the contention based random access procedure may include: randomly selecting a preamble that corresponds to transmission over a Physical Random Access Channel (PRACH).
  • PRACH Physical Random Access Channel
  • the pre-defined physical channel may include physical resources which allow for grant- free and TA-free uplink data transmission.
  • the pre-defined physical channel may be a grant-free access channel (GFACH) as introduced in this disclosure.
  • the configuration information may include a size or transmission scheme of the pre-defined physical channel, in particular at least one of a physical resource, modulation and coding schemes, a maximum payload size and a number of allowed retransmissions.
  • Fig. 6 shows a block diagram illustrating a data transmission device 600 for a user equipment (UE) for establishing transmission over a predefined physical channel according to an implementation form.
  • the data transmission device 600 includes a receive module 601 , a determination module 603 and a transmission module 605.
  • the receive module 601 receives configuration information 604 via a downlink broadcast channel 602 from a base station (BS).
  • the configuration information 604 includes physical resource allocation and transmit parameters of the predefined physical channel.
  • the determination module 603 determines whether the UE is qualified for transmission based on the received configuration information 604 and given capabilities of the UE.
  • the transmission module 605 selects a subset of the physical resource within the pre-defined physical channel and transmits uplink data 608 to the BS on the selected subset of the physical resource, if the UE is qualified 606 for the transmission.
  • the transmission may be a grant-free and/or TA-free data transmission.
  • the data transmission device 600 may further include a trigger module that may trigger a timing adjustment and synchronization procedure if a given number of retransmissions is reached.
  • the data transmission device 600 may further include an open loop-timing adjustment module that may advance a symbol timing for transmission of the uplink data to the BS by a pre-defined amount of time based on a triggering of the trigger module.
  • the data transmission device 600 may implement the method 500 described above with respect to Fig. 5 and the methods 900a, 900b described below with respect to Figures 9 and 10.
  • the configuration information may be determined by a base station, e.g. a BS 103 as described above with respect to Fig. 1.
  • a base station includes a decision module and a broadcast transmission module.
  • the decision module determines configuration information 604 of a predefined physical channel, wherein the configuration information 604 comprises physical resource allocation and transmit parameters of the predefined physical channel.
  • the broadcast transmission module broadcasts the configuration information via a downlink broadcast channel to at least one UE 101 , 102 for establishing data transmission with the at least one UE 101 , 102 over the predefined physical channel.
  • the pre-defined physical channel may include physical resources which allow for grant- free and TA-free uplink data transmission.
  • a transmission system e.g. as shown in Fig. 1 , includes a user equipment (UE) comprising a data transmission device 600 and a base station 103 as described above.
  • the transmission system is configured to establish data transmission between the UE and the BS over the predefined physical channel.
  • Fig. 7 shows a schematic diagram illustrating a physical resource 700 including GFACH (Grant-free access channel) allocated to fixed physical resource 701 , 702, 703 according to an implementation form
  • Fig. 8 shows a schematic diagram illustrating a physical resource 800 including GFACH allocated to physical resource 801 , 803 by using dynamic resource allocation according to an implementation form.
  • the present disclosure introduces a transport or physical channel dedicated for TA-free and grant-free transmissions. Such a channel defines how and with what characteristics the information is transmitted over the radio interface.
  • Grant-Free Access Channel GFACH
  • a channel like GFACH is a pre-condition of the presented random access procedure and may be defined as part of the system
  • the configuration of GFACH in a cell may be included in the master information block (MIB) or system information block (SIB) which is broadcasted to all UEs within the cell.
  • MIB master information block
  • SIB system information block
  • the configuration of GFACH consists of the following aspects: a) Resource allocation: The allocation of GFACH can be either fixed or dynamic in terms of the physical resource, as illustrated in Figures 7 and 8. For the dynamic case, the base station can determine the size or allocation of the GFACH according to the network traffic, b) Transmit parameters, namely modulation/coding schemes, the maximum size of payload which is allowed, the maximum number of retransmissions R, timing adjustment interval etc. These parameters can either be semi-static or dynamically determined by the base station in accordance to the resource allocation.
  • Figures 9 and 10 as described in the following illustrate two random access procedures 900a, 900b which can be applied to realize grant-free and TA-free uplink transmission.
  • Both procedures 900a, 900b are implementation forms of the general method 500 described above with respect to Fig. 5.
  • Fig. 9 shows a schematic diagram illustrating a method for performing a random access procedure 900a according to a first variant.
  • the method 900a is an implementation form of the method 500 described above with respect to Fig. 5.
  • the method 900a establishes a grant-free and TA-free data transmission over a predefined physical channel 701 , 702, 703, 801 , 803.
  • the method 900a includes: receiving 910, a, by a user equipment, UE 101 , 102, configuration information 914 via a downlink broadcast channel 912, 913 from a base station (BS) 103.
  • the configuration information 914 includes physical resource allocation and transmit parameters of the predefined physical channel 701 , 702, 703, 801 , 803.
  • the method 900a further includes: determining 910, b, by the UE 101 , 102, whether the UE 101 , 102 is qualified for a grant-free and TA-free data transmission based on the received configuration information 914 and given capabilities of the UE 101 , 102.
  • the method 900a further includes: If the UE 101 , 102 is qualified for a grant-free and TA- free data transmission, selecting 920, c, by the UE 101 , 102, a subset of the physical resource, e.g. a subset of the physical resource 701 , 702, 703, 801 , 803 as described above with respect to Figures 7 and 8, within the pre-defined physical channel 701 , 702, 703, 801 , 803 and transmitting uplink data 921 , 923 to the BS 103 on the selected subset of the physical resource.
  • a subset of the physical resource e.g. a subset of the physical resource 701 , 702, 703, 801 , 803 as described above with respect to Figures 7 and 8
  • the uplink data 921 , 923 may include an uplink transport block which comprises uplink payload data.
  • the method 900a may further include: receiving feedback information 927, 928 for the transmitted uplink data 921 , 923 from the BS 103.
  • the method 900a may further include: indicating a successful data transmission if the feedback information comprises an acknowledgement (ACK) 927; and repeating the random selection 920, c of a subset of the physical resource within the pre-defined physical channel 701 , 702, 703, 801 , 803 and the transmission of the uplink data 921 , 923 on the selected subset of the physical resource if either the feedback information comprises a non-acknowledgement (NACK) 928 or no feedback information is received.
  • ACK acknowledgement
  • NACK non-acknowledgement
  • the method 900a may further include: repeating 930, f the random selection 920, c of a subset of the physical resource within the pre-defined physical channel 701 , 702, 703, 801 , 803 and the transmission of the uplink data 923 until either feedback information comprising an ACK 927 is received or a given number of retransmissions, in particular a number of retransmissions configured by the BS 103, is reached.
  • the method 900a may further include: if the given number of retransmissions is reached, triggering 939, 959 a timing adjustment and synchronization procedure 940, 960.
  • the method 900a may further include: if a timing adjustment and synchronization procedure 940 is triggered 939, initiating an open-loop timing adjustment 940 by advancing a symbol timing 951 for transmission of the uplink data 923 to the BS 103 by a pre-defined amount of time ⁇ .
  • the method 900a may further include: repeating 930, g the random selection of a subset of the physical resource within the pre-defined physical channel 701 , 702, 703, 801 , 803 and the transmission of the uplink data 923 using the advanced symbol timing 951 for transmission of the uplink data 923 to the BS 103.
  • the original symbol timing 951 may be a maximum number of retransmissions R times a transmission time interval (TTI), i.e. a time interval required for one transmission.
  • TTI transmission time interval
  • the advanced symbol timing 951 may be the original symbol timing 951 reduced by a predefined amount of time ⁇ .
  • the pre-defined physical channel 701 , 702, 703, 801 , 803 may include physical resources, e.g. physical time-frequency resources as described above with respect to Figures 7 and 8 which allow for grant-free and TA-free uplink data transmission.
  • the pre- defined physical channel 701 , 702, 703, 801 , 803 may be a grant-free access channel (GFACH) as introduced in this disclosure.
  • GFACH grant-free access channel
  • the configuration information 914 may include a size or transmission scheme of the predefined physical channel 701 , 702, 703, 801 , 803, for example a physical resource, e.g. a physical time-frequency resource as described above with respect to Figures 7 and 8, modulation and coding schemes, a maximum payload size, a number of allowed retransmissions etc.
  • a physical resource e.g. a physical time-frequency resource as described above with respect to Figures 7 and 8, modulation and coding schemes, a maximum payload size, a number of allowed retransmissions etc.
  • downlink (DL) synchronization is established before the random access procedure 900a starts.
  • DL downlink
  • a UE 101 , 102 In a TA-free transmission, a UE 101 , 102 does not adjust its uplink timing and simply starts uplink transmission following its individual timing. Thus, the uplink timing
  • uplink asynchronicity also known as uplink asynchronicity
  • a the UE 101 , 102 establishes downlink synchronization to the primary cell and obtains the GFACH configuration information 914 by decoding the broadcast channel 912, 913.
  • the configuration information 914 may include the GFACH resource allocation and transmit parameters.
  • a UE 101 , 102 upon the arrival of UL data, a UE 101 , 102 checks the conditions, e.g. UE capability, service category, latency requirement of the traffic, payload size, availability of GFACH in the current cell, etc. and determines if a TA-free and grant-free transmission can be carried out.
  • the UE supports single service type with certain pre-defined requirement, e.g., a sensor, a TA-free and grant-free transmission may start directly.
  • a third step 920, c the UE 101 , 102 initiates a TA-free grant-free transmission on selected, e.g. randomly selected resource within GFACH 701 , 702, 703, 801 , 803.
  • a transport block 921 , 923 consists of the data payload. It is assumed that a certain UE identifier is included in the payload.
  • a fourth step 920, d the BS 103 decodes the received GFACH transport blocks 921 , 923 and feedbacks ACK 927 or NACK 928 over the Physical Hybrid-ARQ Indicator Channel (PHICH). If the BS cannot decode, no feedback message is sent.
  • a fifth step 930, f if a UE 102 receives an ACK 927, the TA-free and grant-free transmission is completed successfully. If a UE 101 receives a NACK 928, steps 910, b, 920, c and 920, d are repeated 930 until either an ACK 927 is received or the maximum number of retransmission R is reached.
  • the UE 101 Upon R times unsuccessful grant-free transmission, the UE 101 assumes itself out of sync and triggers 939 an open-loop timing adjustment 940 by advancing its symbol timing 951 by a pre-defined amount ⁇ . Steps 920, c and 920, d are carried out again.
  • Fig. 10 shows a schematic diagram illustrating a method for performing a random access procedure 900b according to a second variant.
  • Steps 910, a, 910, b, 920, c, 920, d, 920, e and 930, f remain the same as in variant 1 described above with respect to Fig. 9.
  • a close-loop TA procedure 960 is activated.
  • the method 900b may further include: if the timing adjustment and synchronization procedure 960 is triggered 959, starting a closed-loop timing adjustment 960 by initiating a contention based random access procedure 960, g.
  • the contention based random access procedure 960, g may include: randomly selecting a preamble 961 that corresponds to transmission over a Physical Random Access Channel (PRACH) 962.
  • PRACH Physical Random Access Channel
  • the contention based random access procedure 960 may correspond to the procedure 300 as described above with respect to Fig. 3.
  • the number of retransmissions R may be a parameter to be determined by the base station.
  • the base station may adjust this parameter according to the traffic load on its GFACH.
  • Fig. 1 1 shows an amplitude over time diagram 1 100 illustrating different exemplary pulse shapes used for testing the random access procedures 900a and 900b.
  • the first pulse 1 101 is a long pulse example.
  • the second pulse 1 102 is a CP-OFDM transmit pulse.
  • the third pulse 1 103 is a CP-OFDM receive pulse.
  • CP-OFDM cyclic prefix orthogonal frequency division multiplexing
  • pulse-shaped OFDM is considered as the physical layer technique.
  • the system can be adapted to the corresponding scenario. For example, by extending the pulse duration in the time domain, a pulse-shaped OFDM system becomes more robust against timing synchronization errors.
  • pulse shapes are employed and link level performance is evaluated as well as the system level performance using the disclosed random access procedure.
  • Fig. 12 shows a performance diagram 1200 illustrating block error ratio (BLER) over SNR for different OFDM configurations.
  • the first curve 1201 shows a BLER versus SNR performance for a pulse-shaped OFDM MCS25 configuration.
  • the second curve 1202 shows a BLER versus SNR performance for an OFDM MCS25 configuration.
  • the third curve 1203 shows a BLER versus SNR performance for a pulse-shaped OFDM MCS16 configuration.
  • the fourth curve 1204 shows a BLER versus SNR performance for an OFDM MCS16 configuration.
  • the fifth curve 1205 shows a BLER versus SNR performance for a pulse-shaped OFDM MCS9 configuration.
  • the sixth curve 1206 shows a BLER versus SNR performance for an OFDM MCS9 configuration.
  • the seventh curve 1207 shows a BLER versus SNR performance for a pulse-shaped OFDM MCS4 configuration.
  • the eighth curve 1208 shows a BLER versus SNR performance for an OFDM MCS4 configuration.
  • a non-orthogonal multiple access scenario is considered where two UEs access the same frequency resource simultaneously.
  • SDMA space-division multiple access
  • the block error ratio (BLER) results are depicted in Fig. 12.
  • OFDM OFDM are considered. For both cases, grant-free and TA-free transmission is allowed. On the receiver side, an enhanced receiver design which allows four times overloading is employed. Simulations are carried out for three mobility settings, namely 3km/h, 12km/h and 30km/h. The results in terms of maximum number of connections, 1 st shot grant-free connection success rate as well as the net connection numbers are evaluated. Table 2 system level simulation results for one-shot grant-free access
  • the present disclosure also supports a computer program product including computer executable code or computer executable instructions that, when executed, causes at least one computer to execute the performing and computing steps described herein, in particular the steps of the methods 500, 900a, 900b described above.
  • a computer program product may include a readable non-transitory storage medium storing program code thereon for use by a computer.
  • the program code may perform the performing and computing steps described herein, in particular the methods 500, 900a, 900b described above.
  • a computer program may include program code for performing the methods 500, 900a, 900b as described above with respect to Figures 5 and 9 when executed on a computer.

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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 un procédé (900a, 900b) visant à établir une transmission de données sur un canal physique prédéfini, le procédé comportant les étapes consistant à: faire diffuser, par une station de base, des informations de configuration d'un canal physique prédéfini, les informations (914) de configuration comportant une attribution de ressource physique et des paramètres d'émission; faire recevoir (910, a), par un équipement d'utilisateur, (UE) (101, 102), des informations (914) de configuration via un canal (912, 913) de diffusion en liaison descendante à partir d'une station de base (BS) (103); faire déterminer (910, b), par l'UE (101, 102), si l'UE (101, 102) est qualifié pour la transmission d'après les informations (914) de configuration reçues et des capacités données de l'UE (101, 102); et si l'UE (101, 102) est qualifié (503) pour la transmission, faire sélectionner (920, c), par l'UE (101, 102), un sous-ensemble de la ressource physique au sein du canal physique prédéfini (701, 702, 703, 801, 803) et envoyer des données (921, 923) de liaison montante à la BS (103) sur le sous-ensemble sélectionné de la ressource physique.
PCT/EP2016/058555 2016-04-18 2016-04-18 Procédé et dispositif d'établissement de transmission sur un canal physique prédéfini WO2017182053A1 (fr)

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