WO2017120091A2 - Procédés de transmission de petites données critiques pour la mission, au moyen d'un canal d'accès aléatoire - Google Patents

Procédés de transmission de petites données critiques pour la mission, au moyen d'un canal d'accès aléatoire Download PDF

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Publication number
WO2017120091A2
WO2017120091A2 PCT/US2016/069113 US2016069113W WO2017120091A2 WO 2017120091 A2 WO2017120091 A2 WO 2017120091A2 US 2016069113 W US2016069113 W US 2016069113W WO 2017120091 A2 WO2017120091 A2 WO 2017120091A2
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WO
WIPO (PCT)
Prior art keywords
base station
user equipment
short message
code word
codebook
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/US2016/069113
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English (en)
Other versions
WO2017120091A3 (fr
Inventor
Huaming Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
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ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN201680083305.0A priority Critical patent/CN108702781A/zh
Priority to EP16884220.1A priority patent/EP3400747A4/fr
Publication of WO2017120091A2 publication Critical patent/WO2017120091A2/fr
Publication of WO2017120091A3 publication Critical patent/WO2017120091A3/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
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • 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

Definitions

  • This application generally relates to wireless telecommunication and particularly relates to methods of transmitting mission critical small data in a wireless network using a random access channel.
  • a user equipment communicates voice and/or data signals with one or more service networks via base stations (also referred to as “evolved Node-Bs" (eNBs)).
  • eNBs evolved Node-Bs
  • a UE may initiate a random access procedure to
  • the random access procedure can be performed in a contention-based or non-contention-based manner depending on whether a Random Access Channel (RACH) resource used by the UE is randomly selected by the UE itself or assigned by the network.
  • RACH Random Access Channel
  • MTC machine-type communications
  • M2M machine-to-machine
  • MTC communication has some different features than current human-to- human (H2H) communications.
  • a MTC device such as a smart meter may generate a very small data transmission during its report time interval and then go to sleep for a long time interval.
  • a MTC device e.g., a fire alarm
  • An object of the present application is to provide a method for transmitting mission- critical small data between UE and base station using a random access channel with reduced overhead and time delay.
  • a method for a user equipment to transmit a short message to a base station includes the following operations: generating a short message; choosing, among a plurality of codebooks, a codebook corresponding to the short message; identifying, in the codebook, a code word corresponding to a radio network temporary identity (RNTI) of the user equipment; dividing the code word into one or more binary sequences; mapping the one or more binary sequences to one or more random access channel (RACH) preambles; and transmitting the one or more RACH preambles to the base station using a random access channel.
  • RNTI radio network temporary identity
  • a method for a base station to decode a short message transmitted from a user equipment within coverage of the base station includes the following operations: receiving one or more random access channel (RACH) preambles from the user equipment via a random access channel; determining one or more binary sequences by decoding the one or more RACH preambles; combining the one or more binary sequences into a code word; determining a short message by decoding the code word; choosing, among a plurality of codebooks, a codebook corresponding to the short message; and identify, in the chosen codebook, an RNTI of the user equipment, wherein the RNTI corresponds to the code word.
  • RACH random access channel
  • a base station includes one or more processors, memory and a plurality of instructions stored in the memory that, when executed by the one or more processors, perform a plurality of operations as described above in connection with the base station.
  • FIG. 1 A is a block diagram of an exemplary wireless communication system in which embodiments of the present application may be practiced.
  • FIG. IB is a block diagram illustrating a contention-based random access procedure that includes multiple steps.
  • FIG. 2A is a block diagram illustrating the UE-side operations for transmitting a short, mission-critical message to a base station according to some embodiments of the present application.
  • FIG. 2B is a block diagram illustrating the base station-side operations for receiving a short, mission-critical message from a UE according to some embodiments of the present application.
  • FIG. 3 is a flowchart illustrating one embodiment of a method for transmitting a short, mission-critical message from a UE to a base station according to some embodiments of the present application.
  • FIG. 4 is a flowchart illustrating one embodiment of a method for receiving a short, mission-critical message from a UE according to some embodiments of the present application.
  • FIG. 1 A is a block diagram of an exemplary wireless communication system 100 in which embodiments of the present application may be practiced.
  • a base station 102 is in wireless communication with a plurality of user equipments 104 (which may also be referred to as user devices, mobile stations, subscriber units, access terminals, etc.).
  • a first user equipment (UE) 104-A, a second user equipment (UE) 104-B, and an n-th user equipment 104-N are shown in FIG. 1 A.
  • the base station 102 transmits data to and receives data from the UEs 104 over a radio frequency (RF) communication channel 106.
  • RF radio frequency
  • the term "transmitter” refers to any component or device that transmits signals.
  • a transmitter may be implemented in a base station 102 that transmits signals to one or more user equipments 104.
  • a transmitter may be implemented in a user equipment 104 that transmits signals to one or more base stations 102.
  • the term “receiver” refers to any component or device that receives signals.
  • a receiver may be implemented in a user equipment 104 that receives signals from one or more base stations 102.
  • a receiver may be implemented in a base station 102 that receives signals from one or more user equipments 104.
  • the communications system 100 may comply with various wireless communication technologies, such as the Global System for Mobile communications (GSM) technology, Wideband Code Division Multiple Access (WCDMA) technology, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) technology, Long Term Evolution (LTE) technology, and others.
  • GSM Global System for Mobile communications
  • WCDMA Wideband Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • LTE Long Term Evolution
  • FIG. IB is a block diagram illustrating a contention-based random access procedure that includes the following four steps: (1) random access preamble step on Physical Random Access Channel (PRACH); (2) random access response step on Physical Downlink Shared Channel (PDSCH) with UE addressing using Random Access Radio Network Temporary Identity (RA-RNTI) on Physical Downlink Control Channel (PDCCH); (3) scheduled transmission step on Physical Uplink Shared Channel (PUSCH); and (4) contention resolution step on Physical Downlink Shared Channel (PDSCH).
  • PRACH Physical Random Access Channel
  • PDSCH Physical Downlink Shared Channel
  • RA-RNTI Random Access Radio Network Temporary Identity
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • UE 104 selects one of the 64 available RACH preambles. In other words, only 6-bit random access preamble ID information is conveyed in the random access preamble step.
  • the random access response message replied from the base station 102 includes the following information: (i) the 6-bit random access preamble ID, (ii) a timing alignment value for the UE 104 to change its timing, (iii) an initial uplink grant resource so that the UE 104 can use the PUSCH in the subsequent step and (iv) Cell Radio Network Temporary Identity (C RNTI) for further communication.
  • C RNTI Cell Radio Network Temporary Identity
  • the base station 102 uses this optional contention resolution step to end the random access procedure.
  • the aforementioned random access procedure has to be completed to enable data transmission between an UE and a base station regardless of the size of the data to be transmitted whenever a data transmission is to be performed in the current LTE wireless communication system.
  • This requires a large amount of signaling overhead and may result in an unpredictable transmission delay.
  • the unpredictable transmission delay makes it unfit for those mission-critical applications (e.g., a firm alarm); and (ii) the allocated PUSCH resource may not be efficiently utilized because messages from a MTC device are much smaller than the allocated PUSCH resource.
  • the present application proposes a solution to the aforementioned problem by embedding small-size but mission-critical data (e.g., an alarm message of multiple bits long and generated by a fire alarm sensor) in the initial random access preamble transmission step from the UE to the base station.
  • small-size but mission-critical data e.g., an alarm message of multiple bits long and generated by a fire alarm sensor
  • the other information required by the base station is the originator of the data, i.e., the UE ID.
  • the base station needs to know at least the alarm message itself and the fire alarm sensor that generates the alarm message before taking any further actions, e.g., sending a report message to a remote device (e.g., a server or a mobile terminal such as a
  • UEs e.g., MTC devices
  • a mission-critical message generated by one of the UEs is a 2-bit long alarm message with four possible values.
  • the current 16-bit RNTI is long enough as an UE ID to differentiate these MTC devices within a base station's coverage. Note that when the number of UEs within a base station's coverage exceeds 65536, a new UE ID whose length is longer than 16 bits is required to uniquely identify individual UEs with the base station's coverage.
  • the UE's 16-bit RNTI is encoded into one of a plurality of code words that is 24-bit or longer within a codebook.
  • the codebook is uniquely associated with the mission-critical message such that each code word within the codebook corresponds to the same mission-critical message from a particular UE.
  • the code word is then divided into one or more 6-bit binary sequences, which are then mapped to one or more random access preambles and transmitted to the base station in the initial random access preamble transmission step.
  • FIG. 2A is a block diagram illustrating the UE-side operations for transmitting a 2- bit, mission-critical alarm message to a base station according to some embodiments of the present application.
  • the UE first selects, among multiple RNTI codebooks 200, a particular one 201 corresponding to the 2-bit alarm message.
  • a particular code word X within the selected codebook 201 is then identified as being mapped to the RNTI.
  • every 2 bits of the codeword X are grouped together as a binary sequence having a sequential order. For example, '00' are label as 'A' symbol, ⁇ as 'B' symbol, ⁇ as 'C symbol and ' 10' as 'D' symbol, respectively.
  • the output code word X of the corresponding RNTI is configured to contain more 'A' symbols than any other symbols.
  • the output codeword X has 6 'A' symbols, 2 'B' symbols, '2' C symbols and '2' D symbols.
  • the total number of possible code words within a codebook corresponding to a particular alarm message with a predefined symbol distribution is determined by the different orderings of A, B, C and D symbols.
  • Table 1 shows an exemplary RNTI codebook when the alarm message is "00".
  • Table 1. Exemplary RNTI codebook when the alarm message is "00"
  • an RNTI codebook can be generated when the alarm message is "01", “11" or “10", respectively, by having more ' ⁇ ', 'C or 'D' symbols in a code word X.
  • the RNTI of the same UE is mapped to different code words within different codebooks for different alarm messages. But for a particular codebook, the RNTI corresponds to one and only one code word (e.g., code word X shown in FIG. 2 A).
  • Table 2 shows exemplary symbol distributions of a code word X for different alarm message.
  • the symbol distribution can be chosen to meet different error quality targets for the RNTI and the alarm message.
  • the length of the code word X can be chosen to meet different error quality targets for the RNTI and the alarm message.
  • a 30-bit codeword of X can be chosen to have 9 A symbols, 2 B symbols, 2 C symbols and 2 D symbols for the alarm message of "00" for a much larger possible code word space for the RNTI codebook.
  • C(15,9)*C(6,2)*C(4,2)*C(2,2) 450450.
  • the UE After identifying the code word X, the UE converts the code word X into one or more RACH preambles so that they can be transmitted by the PRACH procedure. In this step, the code word X is divided into one or more groups of 6-bit sequences, which are then mapped to one or more RACH preambles to be transmitted by the UE. As shown in FIG. 2A, let xk denotes the k-th bit of the code word X where k is from ⁇ 1, ...
  • the value of the binary sequence of ⁇ xl, x2, x3, x4, x5, x6 ⁇ defines a first RACH preamble configuration index PI; the value of the binary sequence of ⁇ x7, x8, x9, xlO, xl 1, xl2 ⁇ defines the second RACH preamble configuration index P2; the value of the binary sequence of ⁇ xl3, xl4, xl5, xl6, xl7, xl8 ⁇ defines the third RACH preamble configuration index P3; the value of the binary sequence of ⁇ xl9, x20, x21, x22, x23, x24 ⁇ defines the fourth RACH preamble configuration index P4.
  • the UE transmits the above-determined RACH preambles in an order of PI, P2, P3 and P4.
  • there is a time interval between each RACH preamble transmission can be pre-defined or configured by the
  • FIG. 2B is a block diagram illustrating the base station-side operations for recovering a short, mission-critical message from a UE according to some embodiments of the present application.
  • the base station After the base station receives these random access preamble messages from the UE, the base station first re-generates the code word X and then decodes the alarm message by checking the distribution of the received symbols within the re-generated code word X.
  • NA, N B , NC and N D denote the corresponding number of A, B, C and D symbols in the reconstructed code word X.
  • Table 3 shows an exemplary predefined rule of decoding the alarm message. Table 3.
  • the base station selects the same RNTI codebook 201 that has been used by the UE as described above.
  • both the base station and the UE have the same set of RNTI codebooks 200 in order for the UE to transmit the short mission- critical message to the base station.
  • the code word X is found and the corresponding RNTI is identified accordingly as the UE ID.
  • FIG. 3 is a flowchart illustrating one embodiment of a method for transmitting a short, mission-critical message from a UE to a base station according to some embodiments of the present application.
  • the UE generates (310) a short alarm message.
  • the UE is communicatively coupled to a third-party device adjacent to the user equipment (e.g., a firm alarm sensor or a smart meter) and the UE generates a short alarm message in response to an alarm signal from the firm alarm sensor.
  • a third-party device adjacent to the user equipment
  • the UE generates a short alarm message in response to an alarm signal from the firm alarm sensor.
  • the other device is a smart meter and the UE receives a parameter (e.g., power usage) provided by the smart meter on a regular basis and then generates one or more short messages including the value of the parameter.
  • the UE chooses (320) a codebook corresponding to the alarm message.
  • the codebook is configured such that it corresponds to a unique short message generated by the user equipment.
  • the UE then identifies (330) a code word within the codebook corresponding to the UE's identifier (e.g., RNTI).
  • RNTI e.g., RNTI
  • the base station can recover the RNTI when it receives the code word.
  • the UE divides (340) the code word into one or more binary sequences and maps (350) the one or more binary sequences to one or more RACH preambles. For example, each binary sequence is mapped to one RACH preamble as described above in connection with FIG. 2A.
  • the UE transmits (360) the one or more RACH preambles to a base station using a corresponding random access channel between the UE and the base station.
  • FIG. 4 is a flowchart illustrating one embodiment of a method for receiving a short, mission-critical message from a UE according to some embodiments of the present application.
  • the base station receives (410) one or more random access preambles from a UE via a random access channel (e.g., PRACH).
  • a random access channel e.g., PRACH
  • the base station decodes (420) the random access preambles to determine one or more binary sequences.
  • the base station combines (430) the binary sequences to re-generate the code word as described above in connection with FIG. 2B, which then is used to determine (440) a short message corresponding to the code word.
  • the base station chooses (450), among a plurality of codebooks, a codebook that corresponds to the short message.
  • the base station identifies (460), in the chosen code book, an RNTI of the user equipment based on, e.g., a mapping relationship between the RNTI and the corresponding to the code word.
  • the plurality of codebooks are generated by a server and then given to the base station, which then shares them with a plurality of user equipments within coverage of the base station. Whenever there is any update to the codebooks, the base station transmits updated codebooks to the plurality of user equipments within coverage of the base station.
  • first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
  • a first port could be termed a second port, and, similarly, a second port could be termed a first port, without departing from the scope of the embodiments.
  • the first port and the second port are both ports, but they are not the same port.

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

Abstract

L'invention concerne un procédé permettant à un équipement d'utilisateur de transmettre un message court à une station de base. Le procédé comprend les étapes consistant à : générer un message court ; choisir, parmi une pluralité de livres de codes, un livre de codes correspondant au message court ; identifier, dans le livre de codes, un mot codé correspondant à une identité temporaire de réseau radio (RNTI) de l'équipement d'utilisateur ; diviser le mot codé en une ou plusieurs séquences binaires ; mapper la ou les séquences binaires sur un ou plusieurs préambules de canal d'accès aléatoire (RACH) ; et transmettre le ou les préambules RACH à la station de base au moyen d'un canal d'accès aléatoire.
PCT/US2016/069113 2016-01-08 2016-12-29 Procédés de transmission de petites données critiques pour la mission, au moyen d'un canal d'accès aléatoire Ceased WO2017120091A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201680083305.0A CN108702781A (zh) 2016-01-08 2016-12-29 使用随机接入信道来发送关键任务小数据的方法
EP16884220.1A EP3400747A4 (fr) 2016-01-08 2016-12-29 Procédés de transmission de petites données critiques pour la mission, au moyen d'un canal d'accès aléatoire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662276670P 2016-01-08 2016-01-08
US62/276,670 2016-01-08

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WO2017120091A2 true WO2017120091A2 (fr) 2017-07-13
WO2017120091A3 WO2017120091A3 (fr) 2018-02-22

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CN111586592B (zh) * 2020-05-27 2021-11-16 浙江云蛛科技有限公司 基于车联网的车辆行驶状态简短信息的传输方法及系统

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EP3400747A4 (fr) 2019-01-16
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CN108702781A (zh) 2018-10-23

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