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WO2017211390A1 - Adaptation simultanée à l'aide d'une balise bidirectionnelle simultanée - Google Patents

Adaptation simultanée à l'aide d'une balise bidirectionnelle simultanée Download PDF

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Publication number
WO2017211390A1
WO2017211390A1 PCT/EP2016/062881 EP2016062881W WO2017211390A1 WO 2017211390 A1 WO2017211390 A1 WO 2017211390A1 EP 2016062881 W EP2016062881 W EP 2016062881W WO 2017211390 A1 WO2017211390 A1 WO 2017211390A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency
beacon
pilot sequence
user equipment
base station
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/EP2016/062881
Other languages
English (en)
Inventor
Jesus ARNAU YANEZ
Marios Kountouris
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.)
Huawei Technologies Co Ltd
Original Assignee
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 PCT/EP2016/062881 priority Critical patent/WO2017211390A1/fr
Publication of WO2017211390A1 publication Critical patent/WO2017211390A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing

Definitions

  • the invention relates to the field of wireless communications, and more particularly to a communication between a base station and a user equipment device.
  • CSI channel state information
  • CQJ channel quality indicator
  • FDD frequency division duplex
  • M2M machine-to-machine
  • LoT Internet of Things
  • ULs conventional cellular uplinks
  • the UE devices may periodically probe the communication channel by sending a known sequence, even if they have no data to transmit.
  • a known sequence can be supported by LTE through the so-called sounding reference signals (SRS).
  • SRS sounding reference signals
  • the BS will use that known sequence to obtain updated estimations of the channel quality and feed them back to the UE device.
  • that solution not only increases the signaling and the feedback overhead, but also significantly affects the network performance and the efficiency in terms of net throughput. In addition, the actual values of the sounding period might still produce outdated indicators.
  • a standard technique may be the prediction of the state of the channel in the future based on a number of previous samples. Despite those delay compensation techniques, the outdating of the information cannot however be fully avoided.
  • the invention relates to a base station, the base station bei adapted to receive an uplink signal in a first frequency, transmit a downlink signal in a second frequency and transmit a pilot sequence in the first frequency.
  • the base station can receive the uplink signal in a frequency while transmitting in the same frequency the pilot sequence, from which a valuable information related, for example, to a communication channel state can then be extracted.
  • the pilot sequence is uninterruptedly or almost uninterruptedly transmitted in the first frequency.
  • the information to be then extracted from the transmitted pilot sequence can be updated and rendered available at any time if uninterruptedly transmitted or almost at any time if almost uninterruptedly transmitted.
  • the almost uninterrupted transmission can be defined as a repeating transmission with a sufficiently short time interval between two transmissions to be considered to be a quasi-continuous transmission.
  • the base station is adapted to apply a self-interference mitigation to the received uplink signal.
  • the quality of the received uplink signal can be enhanced by minimizing the impact of any interference on itself.
  • the invention relates to a user equipment device being adapted to transmit an uplink signal in a first frequency, receive a downlink signal in a second frequency and receive a pilot sequence in the first frequency.
  • the user equipment device can transmit the uplink signal in a frequency while receiving in the same frequency the pilot sequence, from which the user equipment device can then extract a valuable information related, for example, to a communication channel state.
  • the pilot sequence is uninterruptedly or almost uninterruptedly received in the first frequency.
  • the information to be then extracted from the received pilot sequence can be updated and rendered available at any time if uninterruptedly received or almost at any time if almost uninterruptedly received.
  • the almost uninterrupted reception can be defined as a repeating reception with a sufficiently short time interval between two receptions to be considered to be a quasi-continuous reception.
  • the user equipment device is adapted to obtain a channel information from the received pilot sequence.
  • the user equipment device can obtain a channel information from the received pilot sequence and determine its own transmission parameters using the updated information extracted from the received pilot sequence.
  • the user equipment device is adapted to apply a self-interference mitigation to the received pilot sequence.
  • the quality of the received pilot sequence can be enhanced by minimizing the impact of any interference on itself.
  • the user equipment device is adapted to discriminate between the pilot sequence and a plurality of other individually transmitted pilot sequences. Thereby, the user equipment device can find the pilot sequence corresponding to its own transmission channel amongst a possible plurality of other pilot sequences. If the pilot sequences are orthogonal, the discrimination to find the corresponding pilot sequence can be carried out optimally, namely without interference.
  • the user equipment is adapted to obtain a quality estimation of the channel from the discriminated pilot sequence after discriminating the pilot sequences.
  • the user equipment device can itself estimate the quality of the dedicated transmission channel.
  • the user equipment device can then use the estimated quality information but also an information about a risk of colliding with other uplink signals transmitted from other UE devices in order to decide whether to transmit or not the uplink signal, which leads to avoid unnecessary transmissions and also to save power.
  • the user equipment can be adapted to transmit either independently of the activity of other user equipment devices according to the obtained quality estimation when the uplink signal is transmitted in a random access or dependently of the activity of other user equipment devices according to the risk of colliding with the uplink signals that are transmitted, in particular at the same time, from those other user equipment devices when the uplink signal is transmitted in a full-duplex carrier-sense multiple access.
  • the user equipment device can be adapted to compensate for an internal delay caused inside it, which leads to reduce the transmission latency.
  • the user equipment is adapted to select transmission parameters based on the obtained quality estimation of the channel.
  • the user equipment device can itself select suitable and updated transmission parameters (e.g., an appropriate modulation and coding scheme) with a delay only due to its internal processing, which reduces the transmission latency and increases the transmission throughput.
  • suitable and updated transmission parameters e.g., an appropriate modulation and coding scheme
  • the invention relates to a wireless communication system comprising at least one base station, each base station being as specified in the first aspect and the implementations of the first aspect, and at least one user equipment device, each user equipment device being as specified in the second aspect and the implementations of the second aspect, and wherein each pilot sequence is unique with respect to each base station.
  • the invention relates to a method for communicating from a base station, the method comprising the steps of receiving an uplink signal in a first frequency, transmitting a downlink signal in a second frequency and transmitting a pilot sequence in the first frequency.
  • the pilot sequence is uninterruptedly or almost uninterruptedly transmitted in the first frequency.
  • the invention relates to a method for communicating from a user equipment device, the method comprising the steps of transmitting an uplink signal in a first frequency, receiving a downlink signal in a second frequency and receiving a pilot sequence in the first frequency.
  • the invention relates to a method for communicating between a base station and a user equipment device, the method comprising the steps of applying the steps as specified in the fourth aspect and the implementation of the fourth aspect in connection with the base station and applying the steps as specified in the fifth aspect in connection with the user equipment device.
  • the invention relates to a computer program comprising program code for performing the method according to any one of the fourth, fifth and sixth aspects and/or any one of their respective implementation forms when executed on a computer.
  • the method can be performed in an automatic and repeatable manner.
  • the computer program can be performed by any one of the above apparatuses or devices.
  • the apparatuses or devices can be programmably arranged to perform the computer program.
  • Embodiments of the invention can be implemented in hardware, software or in any combination thereof. It shall further be understood that a preferred embodiment of the invention can also be any combination of the dependent claims or above embodiments with the respective
  • FIG. 1 shows a block diagram of a wireless communication system according to an embodiment of the present invention.
  • Fig. 2 shows a block diagram of a user equipment device according to an
  • Fig. 1 shows a block diagram of a wireless communication system 100 according to an exemplary embodiment of the invention.
  • the wireless communication system 100 comprises at least one user equipment (UE) device and a base station (BS).
  • UE user equipment
  • BS base station
  • the BS communicates with three UE devices (UEl, UE2, UE3) through a communication channel.
  • the BS receives from each of those UE devices a respective uplink signal (S1JJL, S2_UL, S3_UL), for example a data signal, in a same first frequency (f_UL).
  • the BS transmits towards each of those UE devices a respective downlink signal (S1_DL, S2_DL, S3_DL), for example a data signal, in a respective second frequency (fl_DL, f2_DL, f3_DL) different from the first frequency (f_UL).
  • the BS uninterruptedly or almost uninterruptedly transmits towards each of those UE devices a unique sequence already known by themselves, for example a unique pilot sequence, hereafter designated as a beacon, in the same frequency as the first frequency (f_UL) in which it receives the respective uplink signal (S1_UL, S2_UL, S3JJL).
  • a unique pilot sequence hereafter designated as a beacon
  • the almost uninterrupted transmission can be defined as a repeating transmission with a sufficiently short time interval between two transmissions to be considered to be a quasi-continuous transmission.
  • an interference between the beacon and the uplink signal can occur. It results therefrom that both the BS and the UE device are required to work in a full duplex (FD) mode with respect to the beacon and the uplink signal, and consequently to have self-interference mitigation capabilities. Furthermore, it should be noted that the overall network interference does not increase since the UE devices and the BS use their respective FD capabilities for the respective transmission of their uplink signal and the beacon, and not for the transmission of their respective uplink and downlink signals.
  • FD full duplex
  • the UE devices are required to contend for the respective communication channel in a non-scheduled way since the continuous transmission of the beacon in the same frequency as the received uplink signal does not allow the BS to send a scheduling information to the respective UE devices.
  • the UE devices use their respective beacon continuously or quasi-continuously received to extract the channel state information (CSI) at any time when they wish and only with the delay of their internal processing.
  • CSI channel state information
  • the UE devices are then adapted to autonomously select their respective modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • the transmission throughput can be increased and the transmission latency can also be reduced since fewer uplink signal retransmissions due to an inappropriate selected MCS will occur, which further contributes to increasing the system net throughput.
  • the resources can be freed as there is no need neither for MCS feedback from the base station nor for periodic channel sounding from the UE device.
  • Fig. 2 shows a block diagram 200 of a user equipment (UE) device according to an embodiment of the present invention.
  • the block diagram 200 comprises a first unit 210, a second unit 220, a third unit 230 and a fourth unit 240.
  • the UE device is required to work in a full duplex (FD) mode, as it continuously or quasi-continuously receives a pilot sequence or a beacon from the BS in the same frequency as the BS receives the uplink signal transmitted from the UE device, and consequently required to have self-interference mitigation capabilities.
  • the first unit 210 is adapted to mitigate the self-interference caused by the own transmission of the uplink signal with respect to the beacon signal received at its input.
  • the first unit 210 comprises a self-interfering channel estimation unit, which is adapted to receive the outgoing symbols transmitted from the UE device through an output of the fourth unit 240, and a self-interference suppression unit. Based on the received outgoing symbols, an estimation of the self-interfering channel is carried out and the estimation result is then used to control the self-interference suppression unit. If the UE device does not transmit an uplink signal, then the mitigation operation of the first unit 210 can be skipped.
  • An UE device can hear the beacon transmissions from a plurality of BSs.
  • the UE device is then adapted through the second unit 220 to identify the respective BS amongst the plurality of BSs and hence the respective communication channel.
  • the second unit 220 receives the different beacon signals transmitted through the self- interference suppression unit of the first unit 210 and discriminates between the received beacon signals and therefore the respective communication channels. If the beacon signals are orthogonal, then there is no interference between the BSs and the discrimination can be perfectly performed.
  • the UE device cannot distinguish between the channels of different BSs, which results in a "polluted", i.e., coarse, channel estimation.
  • the UE device can also distinguish between the channels of different BSs.
  • the UE device can still distinguish between the channels of different BSs provided that the beacon signals are almost orthogonal, namely non-orthogonal but with good cross-correlation properties. Afterwards, based on the discrimination result, the second unit 220 estimates the quality of the respective
  • a linear channel estimation based on mean squared error (MSE) minimization or an iterative turbo channel estimation e.g., a linear channel estimation based on mean squared error (MSE) minimization or an iterative turbo channel estimation.
  • MSE mean squared error
  • the third unit 230 is provided in order to compensate for the internal processing delay caused by the self-interference mitigation, the channel identification and the channel quality estimation. Such a compensation can be made, for example by using the prediction of future channel states, such as the linear prediction and the Kalman filtering.
  • the UE device Based on the estimated quality of the respective communication channel, the UE device selects its transmission parameters, such as an appropriate modulation and coding scheme (MCS), through the fourth unit 240. Furthermore, in order to take account of unforeseen impairments, a back-off can be used, which selects slightly more robust transmission parameters than the ones selected based on the estimated quality of the respective communication channel.
  • the back-off value can be fixed or variable depending on the success of the previous transmissions.
  • the UE device can also decide not to transmit and therefore not to use the selected transmission parameters, such as the MCS, if the estimated quality of the respective communication channel is considered too low or the UE device detects other UE devices using the medium at the same time.
  • the first option of not transmitting may occur when a vehicle with a vehicular network goes through a tunnel, thereby leading to energy saving, or when the transmission uses a random access (RA) scheme.
  • RA random access
  • the UE device can transmit independently of the activity of the other UE devices, the possible collisions being accounted for in the code domain or dealt with in any other way at the respective BS.
  • the second option of not transmitting may occur when the UE device is capable of "listening" to the medium, for example when the transmission uses a full-duplex carrier-sense multiple access (FD-CSMA) scheme.
  • FD-CSMA full-duplex carrier-sense multiple access
  • the UE device can transmit dependently of the activity of the other UE devices according to the risk of colliding with the uplink signals.
  • the present invention relates to apparatuses and methods for transmitting from at least one user equipment (UE) device a respective uplink signal in a first frequency towards at least one base station (BS), and transmitting from the at least one base station, both a downlink signal in a second frequency different from the first frequency and a respective pilot sequence or beacon in a same frequency as the first frequency.
  • the pilot sequence is unique with respect to each base station and uninterruptedly or almost uninterruptedly transmitted from the at least one base station.
  • the at least one base station and the at least one user equipment device apply each a self-interference mitigation, and the pilot sequence is used by the at least one user equipment device in order to select appropriate transmission parameters to transmit.
  • the present invention can be applied to any wired or wireless transmission system.
  • the receiver device of the proposed system can be implemented in discrete hardware or based on software routines for controlling signal processors at the reception side.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
  • a suitable medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

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

Abstract

La présente invention concerne des appareils et des procédés pour émettre, à partir d'au moins un dispositif d'équipement utilisateur, un signal de liaison montante respectif à une première fréquence vers au moins une station de base, et pour émettre à partir de ladite station de base, un signal de liaison descendante à une seconde fréquence différente de la première fréquence et une séquence pilote ou une balise respective dans une même fréquence que la première fréquence. La séquence pilote est unique par rapport à chaque station de base et transmise sans interruption ou presque sans interruption à partir de ladite station de base. Ladite station de base et ledit dispositif d'équipement utilisateur appliquent chacun une atténuation d'auto-interférence, et la séquence pilote est utilisée par ledit dispositif d'équipement utilisateur afin de sélectionner des paramètres de transmission appropriés à transmettre.
PCT/EP2016/062881 2016-06-07 2016-06-07 Adaptation simultanée à l'aide d'une balise bidirectionnelle simultanée Ceased WO2017211390A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/062881 WO2017211390A1 (fr) 2016-06-07 2016-06-07 Adaptation simultanée à l'aide d'une balise bidirectionnelle simultanée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/062881 WO2017211390A1 (fr) 2016-06-07 2016-06-07 Adaptation simultanée à l'aide d'une balise bidirectionnelle simultanée

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WO2017211390A1 true WO2017211390A1 (fr) 2017-12-14

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2797355A1 (fr) * 2012-01-18 2014-10-29 Huawei Technologies Co., Ltd Procédé et appareil de communication sans fil
WO2015099344A1 (fr) * 2013-12-24 2015-07-02 엘지전자 주식회사 Procédé pour qu'un terminal transmette des données de liaison montante dans un environnement de communication fdr
WO2016006779A1 (fr) * 2014-07-10 2016-01-14 Lg Electronics Inc. Procédé permettant à un équipement d'utilisateur (ue) d'exécuter une communication en mode duplex à répartition dans le temps (tdd) spécifique à l'ue dans un réseau configuré pour supporter un mode tdd spécifique à l'ue dans lequel une station de base (bs) opère en mode duplex intégral et un ue opère en mode semi-duplex, et équipement utilisateur (ue) correspondant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2797355A1 (fr) * 2012-01-18 2014-10-29 Huawei Technologies Co., Ltd Procédé et appareil de communication sans fil
WO2015099344A1 (fr) * 2013-12-24 2015-07-02 엘지전자 주식회사 Procédé pour qu'un terminal transmette des données de liaison montante dans un environnement de communication fdr
US20160323830A1 (en) * 2013-12-24 2016-11-03 Lg Electronics Inc. Method for terminal for transmitting uplink data in fdr communication environment
WO2016006779A1 (fr) * 2014-07-10 2016-01-14 Lg Electronics Inc. Procédé permettant à un équipement d'utilisateur (ue) d'exécuter une communication en mode duplex à répartition dans le temps (tdd) spécifique à l'ue dans un réseau configuré pour supporter un mode tdd spécifique à l'ue dans lequel une station de base (bs) opère en mode duplex intégral et un ue opère en mode semi-duplex, et équipement utilisateur (ue) correspondant

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