WO2018010542A1 - Procédés et dispositifs d'adaptation de liaison dans des conditions de brouillage intermittent dans des systèmes de communication sans fil - Google Patents

Procédés et dispositifs d'adaptation de liaison dans des conditions de brouillage intermittent dans des systèmes de communication sans fil Download PDF

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WO2018010542A1
WO2018010542A1 PCT/CN2017/090370 CN2017090370W WO2018010542A1 WO 2018010542 A1 WO2018010542 A1 WO 2018010542A1 CN 2017090370 W CN2017090370 W CN 2017090370W WO 2018010542 A1 WO2018010542 A1 WO 2018010542A1
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sub
wireless communication
frames
cqi
mcs
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PCT/CN2017/090370
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English (en)
Inventor
Thomas Winiecki
Efstathios KATRANARAS
Guang Liu
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Jrd Communication Inc.
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Priority to CN201780054121.6A priority Critical patent/CN110036659B/zh
Publication of WO2018010542A1 publication Critical patent/WO2018010542A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions

Definitions

  • Embodiments of the present invention generally relate to wireless communication systems and in particular to devices and methods for optimising performance of communication links over the air interface in the presence of bursty or intermittent interferers.
  • the granularity of the MCS chosen by the eNB can be greater than the target MCS that is suggested by the UE in a CQI report. If the link quality is good, a signal can be sent with a complex modulation scheme and little redundancy. Conversely, if the link quality is poor due to high losses or the presence of interferers, the modulation scheme is simplified and more redundancy is added to make the signal more robust and easier to decode by the receiving device.
  • eNB and a UE using an unlicensed frequency carrier e.g. 5GHz spectrum shared with WiFi devices
  • the eNB and WiFi transmitter will normally try to avoid simultaneous transmission by employing the so-called Listen Before Talk procedure whereby a device will postpone transmission on a particular channel if it detects energy on that channel.
  • the threshold for detecting this energy is relatively high and as long as the eNB and WiFi access point are far enough apart, they could consider the channel available and so transmit simultaneously.
  • a UE using the channel to communicate with the eNB could suffer from severe interference from the WiFi transmissions.
  • the invention provides methods and systems which employ a 'modified*form of the conventional CQI reporting from a wireless communication device to a base station, in order for the base station (an eNB in certain examples) to be able to prepare Modulation and Coding Schemes (MCS) , not only in the conventional way, but also by disregarding reports relating to subframes affected by intermittent interference.
  • MCS Modulation and Coding Schemes
  • the 'modified' form of a CQI report may include additional information as described in more detail below.
  • a wireless communication device for enabling link adaptation in a wireless communication system
  • the wireless communication device comprising a receiver for receiving, from a base station supporting communications in the wireless communication system, a downlink transmission burst comprising a plurality of sub-frames, a signal processor for monitoring the quality of the received downlink transmission burst for every sub-frame and for computing, for each received sub-frame, a Channel Quality Indicator (CQI) value which is coded in terms of a target modulation and coding scheme (MCS) that can be used to receive data with a block error rate (BLER) up to a pre-determined value, and a transmitter for reporting to the base station, the computed CQI value for every received sub-frame.
  • CQI Channel Quality Indicator
  • a base station for enabling link adaptation in a wireless communication system, the base station comprising a receiver arranged to receive from a wireless communication device in the wireless communication system, for every sub-frame of a downlink transmission burst, a report including a CQI (Channel Quality Indicator) value which is coded in terms of a target modulation and coding scheme (MCS) that can be used to receive data at the wireless communication device with a block error rate (BLER) up to a pre-determined value, and a signal processor for selecting a MCS depending on the received report.
  • CQI Channel Quality Indicator
  • MCS target modulation and coding scheme
  • BLER block error rate
  • the base station in a link adaptation procedure, may choose a higher (or more "aggressive" ) MCS by considering the reported channel conditions in only those sub-frames which are unaffected by intermittent or bursty interference.
  • the base station in a link adaptation procedure, may choose a lower (more robust) MCS by considering the reported channel conditions of all sub-frames. In the former case, the BLER value will be higher than in the latter case.
  • the base station has the ability to handle the higher re-transmission rates that will result from a higher BLER.
  • the choice of an intermediate MCS does not necessarily provide any advantage. An intermediate MCS will give a lower throughput in undisturbed sub-frames but will still fail to be decoded in sub-frames suffering from interference.
  • a wireless communication device comprising a receiver for monitoring quality of a downlink channel in a wireless communication system, a signal processing circuit for computing a Channel Quality Indicator (CQI) report, wherein the report includes an indication of a target modulation and coding scheme (MCS) that can be used to receive data in a group of sub-frames comprising a downlink transmission burst with a block error rate (BLER) up to a predetermined value and information relating to a ratio of the number of sub-frames in the group of sub-frames which are most affected by interference to the number of sub-frames in the group of sub-frames which are least affected by interference, and wherein the wireless communication device comprises a transmitter for transmitting the channel quality indicator report to a base station supporting communications in the wireless communication system.
  • MCS modulation and coding scheme
  • BLER block error rate
  • HARQ Hybrid Automatic Repeat Request
  • INR interference to noise ratio
  • a high INR is equivalent to a high variation (or spread) in the values of the calculated CQI.
  • a decision to enable or disable HARQ can be made based on the difference between the highest and lowest reported CQI values in a given number of reports. So, for a large spread (i.e. high interferer power) , HARQ may be disabled but for a small spread, HARQ is retained.
  • a base station for enabling link adaptation in a wireless communication system, the base station comprising a receiver for receiving from a wireless communication device in the wireless communication system, a Channel Quality Indicator (CQI) report, wherein the report includes an indicator of a target modulation and coding scheme (MCS) that can be used to receive data in a group of sub-frames comprising a downlink transmission burst with a block error rate (BLER) up to a predetermined value and information relating to a ratio of the number of sub-frames in the group of sub-frames which are most affected by interference to the number of sub-frames in the group of sub-frames which are least affected by interference, and wherein the base station comprises a signal processor for selecting a modulation and coding scheme MCS depending on the received CQI reports.
  • CQI Channel Quality Indicator
  • the base station sends a request to the wireless communication device to send it a Channel Quality Indicator report which includes said information relating to the ratio of the number of sub-frames in the group of sub-frames which are least affected by interference to the number of sub-frames in the group of sub-frames which are most affected by interference.
  • the base station may also ask the wireless communication device for information relating to, for example, CQI values per downlink subframe, lowest CQI values, highest CQI values, CQI values for only those subframes unaffected by interference
  • the base station may limit the number of UEs targeting a higher order MCS so that the number of overall re-transmissions (and associated buffer sizes and signalling overheads) does not become limiting.
  • the rate of reception errors and therefore necessary re-transmissions will be of the order of, or slightly higher than, the rate of interference events. If this rate is reported by a wireless communication device to the base station, the base station can predict the number of re-transmissions likely to occur. Thus, it will be possible for the base station to optimize the allocation of higher order MCS across the population of all wireless communication devices in the base stations region of coverage based on their collective reports on interferer duty cycles and differences in CQI for affected and non-affected sub-frames.
  • a method for enabling link adaptation in a wireless communication system comprising, at a base station receiving from a wireless communication device in the wireless communication system, a Channel Quality Indicator (CQI) report, wherein the report includes an indication of a target modulation and coding scheme (MCS) that can be used to receive data in a group of sub-frames comprising a downlink transmission burst with a block error rate (BLER) up to a predetermined value, monitoring ACK/NACK messages from the wireless communication device to determine an indication of a duty cycle of an interferer, and selecting a modulation and coding scheme (MCS) depending on the received CQI report and the indication of said duty cycle duty.
  • CQI Channel Quality Indicator
  • a non-transitory computer readable medium having computer readable instructions stored thereon for execution by a processor to perform the method according to the fifth, sixth or seventh aspects.
  • Figure 1 is a simplified block diagram of a part of a wireless communication system and operating in accordance with an example embodiment
  • Figure 3 is a simplified flow chart illustrating a second method for assisting a link adaptation procedure.
  • an example of part of an LTE cellular communication system operating in accordance with embodiments of the invention is illustrated and indicated generally at 100 and comprises an evolved Node B (eNB) 101 supporting an LTE cell 102.
  • the eNB 101 may support a multiplicity of cells.
  • the cell 102 can be considered to be a cell using licensed frequency spectrum or can be a LAA cell using unlicensed spectrum.
  • the LAA downlink is arranged in subframes.
  • the eNB 101 and UE 103 have the capability of operating a Listen Before Talk procedure.
  • the evolved Node B 101 comprises a part of a radio access network which in this example is an E-UTRAN.
  • User Equipment 103 is located within the area of coverage of the cell 102.
  • the eNB 101 is provided with a receiver circuit 108 for receiving messages from one or more UEs and also a transmitter circuit 109 for transmitting messages to one or more User Equipments.
  • the eNB is also provided with a signal processor 110 whose purpose will be described below.
  • the User Equipment 103 includes a receiver 111 for receiving messages from the eNB 101 a transmitter 112 for transmitting messages to the eNB101 and a signal processing circuit 113 whose function will be described below.
  • the eNB 101 supports communications with the UE 103 using licensed and unlicensed spectrum.
  • First and second access points 114 and 115 provide WiFi signals using unlicensed spectrum for use by communications devices within their coverage areas.
  • the first access point 114 is in close proximity to the UE 103 and more distant from the eNB 101.
  • the second access point 115 is in close proximity to the eNB and more distant from the UE.
  • the UE 103 is monitoring the downlink of an LAA unlicensed channel supported by the eNB 101 and the access point 114 is transmitting (intermittently) in the same unlicensed spectrum (5GHz say) .
  • the access point 114 is sufficiently distant from the eNB 101 so that its transmissions are not detected in a Listen Before Talk procedure carried out by the eNB 101 yet is close enough to the UE 103 for the UE to be able to detect its transmissions as noise or intermittent interference.
  • the duty cycle of the transmissions from the access point 114 are such that one out of every three subframes of the LAA downlink monitored by the UE 103 are affected by bursty interference from the access point 114.
  • the signal processor in the eNB ignores the CQI reports for sub-frames affected by bursty interference (i.e. those subframes reported with comparatively low CQI values) and uses the MCS value corresponding to those CQI reports for the other, unaffected sub-frames and suffers an increased necessity for retransmissions. If there is just one strong interferer, the rate of retransmissions will correspond to the ratio of sub-frames affected by the interferer.
  • the signal processor in the eNB considers reports in respect of all subframes and so selects a lower MCS value. The second alternative ensures an increased resilience to interference for all sub-frames. It will be noted that in the current standards, with an average CQI, the situation is non-optimal because unaffected sub-frames would get a lower MCS than is achievable whereas affected sub-frames cannot be decoded
  • this drawback may be overcome as follows.
  • the UE 103 monitors the downlink of an LAA unlicensed channel supported by the eNB 101 and the access point 114 transmits (intermittently) in the same unlicensed spectrum (5GHz) .
  • the access point 114 is sufficiently distant from the eNB 101 so that its transmissions are not detected in a Listen Before Talk procedure carried out by the eNB 101 yet is close enough to the UE 103 for the UE to be able to detect its transmissions as noise or intermittent interference.
  • the UE 103 commences to monitor the downlink quality of the unlicensed spectrum.
  • the Wi-Fi access point 114 starts to transmit with a 20 per cent duty cycle.
  • the UE detects that the downlink quality is now affected by bursty interference (from the access point 114) and the signal processing circuit 113 computes a CQI value which it codes in terms of a target MCS that can be used to receive data with a block error rate (BLER) up to 10%under the current link conditions.
  • BLER block error rate
  • the CQI report is received at the eNB 101.
  • a MCS is determined based on the information received in the CQI report. For example, the eNB 101 may choose to use a MCS having a high resilience against interference but a comparatively low peak throughput. Such an MCS is tuned to the channel conditions of the worst affected sub-frames. Alternatively, knowing that the ratio of affected sub-frames to unaffected sub-frames is comparatively low (2 in every 10) the eNB 101 may choose to use a higher order MCS than that conveyed by the UE 103 but with the expectation that many sub-frames will be lost.
  • the signal processing circuit 113 in the UE 103 computes the duty cycle of the interfering signal and includes this in the CQI report (instead of the value for the ratio) .
  • the signal processor 110 in the eNB 101 uses this duty cycle value along with the received CQI value to determine an MCS.
  • graph-maps are standardised and stored as search tables and used by the signal processor 110 in the eNB 101 such that a UE can just report a few (indicator) bits representing the downlink situation (SNR, INR, duty cycle) matching closest to its channel measured statistics. Such indicator bits may be sent at the request of the base station.
  • an indication of either of these parameters is computed in the signal processor 110 of the eNB 101 by monitoring ACK/NACK messages from the UE 103.
  • operating standards may re-define what a UE is allowed to collect and report in an environment of intermittent interference. For example, upon detecting a bursty interference environment, the UE can start collecting different types of statistics regarding its CQI (e.g. best CQI, worst CQI over a period) and signal processing functionality in the UE can compute an optimum MCS under the prevailing circumstances and report such computed MCS to the eNB. In one embodiment, the UE computes a MCS based only on the CQI values of unaffected sub-frames and ignores affected sub-frames.
  • CQI e.g. best CQI, worst CQI over a period
  • Intermittent interference can also occur on an uplink.
  • the access point 115 is close to the eNB 101 but distant from the UE 103.
  • the access point 114 and the UE 103 are sufficiently far apart so that each considers that their channel is occupied and therefore may transmit simultaneously.
  • the eNB 103 receiving the UE's uplink signal is thus disturbed by the transmissions from the access point 114.
  • the uplink link adaptation is fully under the control of the eNB and not standardized.
  • Similar extra information as described for the downlink case, can be made available at the UE and improve link adaptation for bursty interference.
  • the signal processing functionality of the embodiments of the invention especially the signal processor of the eNB and the signal processing circuit of the UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit

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

Abstract

L'invention concerne un procédé d'aide à l'adaptation de liaison d'une liaison descendante entre un nœud B évolué (eNB) 101 et un équipement utilisateur (UE) 103 dans un système LTE, fonctionnant dans un spectre sans licence, qui est passible d'un brouillage intermittent, repose sur l'envoi par l'UE à l'eNB d'informations supplémentaires comprises dans des rapports d'indicateur de qualité de canal (CQI) indiquant à l'eNB le cycle de service du brouilleur. Sur la base des informations contenues dans ce rapport de CQI modifié, l'eNB peut choisir d'utiliser un schéma de codage de modulation (MCS) d'ordre supérieur ce qui permet d'obtenir un débit plus élevé mais nécessite des retransmissions fréquentes ou un MCS d'ordre inférieur qui ne nécessite pas de retransmissions fréquentes mais aura l'inconvénient d'un débit plus faible.
PCT/CN2017/090370 2016-07-12 2017-06-27 Procédés et dispositifs d'adaptation de liaison dans des conditions de brouillage intermittent dans des systèmes de communication sans fil WO2018010542A1 (fr)

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CN201780054121.6A CN110036659B (zh) 2016-07-12 2017-06-27 用于无线通信系统中间歇干扰条件下的链路自适应的方法和设备

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GB1612107.1A GB2552307A (en) 2016-07-12 2016-07-12 Methods and devices for link adaptation under conditions of intermittent interference in wireless communication systems

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EP3920630A1 (fr) * 2020-06-03 2021-12-08 Nokia Technologies Oy S'assurer que les transmissions sont effectuées dans un réseau sans fil
US11595148B2 (en) 2020-06-03 2023-02-28 Nokia Technologies Oy Ensuring transmissions are completed in a wireless network
WO2022206205A1 (fr) * 2021-03-29 2022-10-06 大唐移动通信设备有限公司 Procédé et appareil permettant de modifier un processus de transmission de données et support de stockage lisible par un processeur

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