WO2016114767A1 - Mise en cache coopérative basée sur la localisation au niveau du réseau d'accès radio - Google Patents

Mise en cache coopérative basée sur la localisation au niveau du réseau d'accès radio Download PDF

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Publication number
WO2016114767A1
WO2016114767A1 PCT/US2015/011254 US2015011254W WO2016114767A1 WO 2016114767 A1 WO2016114767 A1 WO 2016114767A1 US 2015011254 W US2015011254 W US 2015011254W WO 2016114767 A1 WO2016114767 A1 WO 2016114767A1
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WO
WIPO (PCT)
Prior art keywords
cached content
content
given
base station
delay
Prior art date
Application number
PCT/US2015/011254
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English (en)
Inventor
Salam Akoum
Joydeep Acharya
Original Assignee
Hitachi, 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 Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/US2015/011254 priority Critical patent/WO2016114767A1/fr
Publication of WO2016114767A1 publication Critical patent/WO2016114767A1/fr

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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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching

Definitions

  • LOCATION BASED COOPERATIVE CACHING AT THE RAN Field The present disclosure relates generally to wireless systems, and more specifically, to cooperative caching for a random access network (RAN).
  • RAN random access network
  • Related Art primarily involves web caching schemes in content delivery networks (CDNs) or private delivery networks (PDNs).
  • CDNs content delivery networks
  • PDNs private delivery networks
  • FIG. 1 An illustration of a related art Long Term Evolution (LTE) system with PDN or evolved packet core (EPC) caching and RAN caching is illustrated in FIG. 1.
  • the system involves an EPC 100 that is connected to the internet 102 for receiving cached content which can be provided to one or more base stations in the RAN 101.
  • LTE Long Term Evolution
  • EPC evolved packet core
  • RAN may have an effect of reducing network traffic, improving quality of experience, and reducing the traffic congestion problems related to backhaul capacity and delay at the RAN network.
  • the related art implementation issues related to GTP tunneling may be overcome using byte caching. Combining both EPC caching and RAN caching may improve mobile traffic.
  • Related art solutions targeting RAN caching are mostly directed to what to cache where, taking into account the storage capacity at the base stations, the file popularity, and the backhaul capabilities. However, the related art solutions are based on heuristics and approximate solutions. Femtocaching was introduced in the related art to evaluate the content delivery through distributed caching helpers in femtocell networks.
  • Another implementation in the related art applies a game theoretical formulation in which a many- to-many matching game is formulated between small cell base stations and a set of videos to cache based on minimizing the download time for the requesting users and the backhaul load is reduced at the small cell base stations.
  • Another implementation in the related art exploits user files correlations to create popularity matrix of the different files and push them proactively onto small cells.
  • Other caching implementations in the related art take into account device-to-device (D2D) technology, where a set of influential users is determined using the centrality metric, and the content dissemination process is determined.
  • D2D device-to-device
  • Caching may reduce the traffic exchanged at the inter- and intra-internet service providers (ISP) levels and may also reduce the response time or latency needed to fetch a file. Caching not only alleviates congestion at the network, but also reduces the energy consumption, and reduces the peak backhaul capacity required at the RAN side.
  • ISP inter- and intra-internet service providers
  • Caching has been applied in wired networks to reduce the number of hops required to fetch content, as well as to do load balancing between different servers.
  • Caching at the RAN has not been considered in the related art due to challenges related to storage space at the base stations, and GTP-tunneling at the core network.
  • there are location-based cooperative RAN caching strategies whereas cooperation decisions, usually based on short term and long term physical (PHY) layer metrics, take into account the content requested by the users, the cacheability of the content at the affected base stations, and the type of the base station.
  • PHY physical
  • Example implementations may involve new systems and methods for forming Coordinated Multi Point (CoMP) sets taking into account, in addition to Radio Resource Measurements (RRM) measurements and Channel State Interference (CSI) measurements, the availability of the requested content at the neighboring base station.
  • CoMP Coordinated Multi Point
  • DPS Dynamic Point Selection
  • DPS Dynamic Point Selection
  • a base station which may involve a memory configured to store cached content; and a processor, configured to communicate with one or more other base stations having cached content associated with the cached content stored in the memory; and join a coordinated multipoint (CoMP) set with ones of the one or more other base stations having the cached content associated with the cached content stored in the memory, for a given user equipment (UE).
  • CoMP coordinated multipoint
  • aspects of the present disclosure further include a method for a base station, which can include managing cached content; communicating with one or more other base stations having cached content associated with the cached content managed by the base station; and joining a coordinated multipoint (CoMP) set with ones of the one or more other base stations having the cached content associated with the cached content stored in the memory, for a given user equipment (UE).
  • a base station can include managing cached content; communicating with one or more other base stations having cached content associated with the cached content managed by the base station; and joining a coordinated multipoint (CoMP) set with ones of the one or more other base stations having the cached content associated with the cached content stored in the memory, for a given user equipment (UE).
  • CoMP coordinated multipoint
  • aspects of the present disclosure further include a computer program for a base station, storing instructions for executing a process, which can include managing cached content; communicating with one or more other base stations having cached content associated with the cached content managed by the base station; and joining a coordinated multipoint (CoMP) set with ones of the one or more other base stations having the cached content associated with the cached content stored in the memory, for a given user equipment (UE).
  • the computer program can be stored on a non-transitory computer readable medium and executed by one or more processors.
  • FIG. 1 illustrates a Long Term Evolution (LTE) system with PDN or evolved packet core (EPC) caching and RAN caching.
  • LTE Long Term Evolution
  • EPC evolved packet core
  • FIG. 2 illustrates a flow diagram of CoMP set formation, in accordance with an example implementation.
  • FIG.3 illustrates a cache CoMP measurement set formation module, in accordance with an example implementation.
  • FIG. 4 illustrates a flow diagram of the cache CoMP cooperating set transmission module, in accordance with an example implementation.
  • FIG. 5 illustrates an example of a cache cooperating set having three transmission points, in accordance with an example implementation.
  • FIG. 6 illustrates a flowchart from transmitting content, in accordance with an example implementation.
  • FIG. 7 illustrates an example of an application of FIG. 6, in accordance with an example implementation.
  • FIG. 8 illustrates an example apparatus implementation for a core network, in accordance with an example implementation.
  • FIG. 9 illustrates an example base station upon which example implementations can be implemented.
  • FIG. 10 illustrates an example user equipment upon which example implementations can be implemented.
  • FIG. 2 illustrates a flow diagram of CoMP set formation, in accordance with an example implementation.
  • the UE initially measures Reference Signal Receive Power (RSRP) or Reference Signal Received Quality (RSRQ) of different neighboring base stations, and sends the measurements to the eNB. This is implemented for CoMP resource management set formation or Radio Resource Management (RRM) measurement set formation.
  • the measurements convey the long-term downlink channel quality from the various transmitting points.
  • potential points can be selected for CoMP transmission to the UE. The selection of these points is illustrated at 201 for forming the cache CoMP measurement set.
  • the base station selects the CoMP measurement set for UE from the CoMP resource management set based on the RSRP/RSRQ measurements 201-1, and/or finds CoMP caching set for UE based on content available at the CoMP resource management set 201-2.
  • the sets are then processed to an optimization module 201-3, wherein a CoMP cooperating set is formed and transmission is performed 202.
  • the CoMP RRM measurement set includes transmission points (e.g., 32) wherein downlink channel quality to the UE is measured via RSRP/RSRQ.
  • FIG. 3 illustrates a cache CoMP measurement set formation module 300, in accordance with an example implementation.
  • the RRM measurement set is first parsed to determine which of the transmitting points contains any cached components of the UE requested content. Note that due to GTP tunneling, the caching can be byte caching or a form of packet caching.
  • the newly formed subset is then downsized into the cached CoMP measurement set by selecting, for example, the transmission point that have the information, have a RSRP measurement meeting a desired threshold, having a backhaul quality meeting a desired threshold, and no duplications. This selection is done based on an optimization problem that takes into account the critical content and the channel quality to the UE and to the transmission point and the number of UEs being served by that particular transmission point. For example, if the transmission point is serving a lot of UEs such that its resources are scarce, that constraint is taken into account in the optimization problem.
  • the cached-CoMP measurement set is then used to determine the CoMP cooperating set.
  • the cached CoMP measurement set need not be restricted to a maximum of three transmission points as in Release 11 (Rel. 11) CoMP.
  • the number of transmission points in the cached CoMP measurement set is determined such that the feedback required from the UE is minimized, but the cached content is maximized.
  • another aspect in the overall system is the CoMP cooperating set formation.
  • the CoMP cooperating set includes points that participate in data transmission to the UE.
  • An example of a CoMP cooperation set transmission based on dynamic point selection (DPS) is shown in FIG.4 and FIG.5.
  • FIG. 4 illustrates a flow diagram of the cache CoMP cooperating set transmission module 400, in accordance with an example implementation.
  • FIG. 5 illustrates an example of a cache cooperating set having three transmission points, in accordance with an example implementation.
  • FIG. 6 illustrates a flowchart from transmitting content, in accordance with an example implementation.
  • the transmission can be handled by a content transmission module 600.
  • the delay is estimated from requesting the content from the CDN while accounting for backhaul delay. The delay will be estimated based on the type of link between the base station and the core network, and the level of congestion at the core network and the RAN.
  • this delay is the time it takes a packet to arrive from the server to the base station after requesting the information.
  • the total delay for transmitting the cached content to the UE with potential retransmissions due to bad channel quality is estimated. This includes an estimate of the delay at the backhaul between the different base stations in the CoMP set, and an estimate of the delay given the RSSI from the base station to the UE and given previously transmitted packets from this base station with the same channel quality.
  • a worst case scenario delay can be estimated whereas the maximum delay is estimated given the backhaul and the channel quality.
  • a comparison is made between the two delays.
  • FIG. 7 illustrates an example of an application of FIG. 6, in accordance with an example implementation.
  • the application requested by the UE 700 is delay sensitive and one of the cache cooperating set transmission points experiences a bad channel quality to the UE, but contains part of the content requested by the UE.
  • the transmission point in this case makes a decision (e.g. by the content transmission module 600 in FIG.
  • FIG. 8 illustrates an example apparatus implementation for a core network, in accordance with an example implementation.
  • the apparatus implementation may be in the form of a Mobility Management Entity (MME), a packet gateway (P-GW), a serving gateway (S-GW), a home subscriber server (HSS), a policy control and charging rules function (PCRF) or a device configured to perform the functions of the core network 100, or a combination of devices thereof, and implemented in the form of a server or computer depending on the desired implementation.
  • MME Mobility Management Entity
  • P-GW packet gateway
  • S-GW serving gateway
  • HSS home subscriber server
  • PCRF policy control and charging rules function
  • the apparatus 800 may include a CPU 801, a memory 802 and a RAN interface 803.
  • the CPU 801 may invoke one or more functions that facilitate the apparatus to provide content to one or more base stations of associated RANs.
  • the memory 802 may be configured to store information to manage functionality of the apparatus and the associated RANs.
  • CPU 801 may include one or more functions such as UE ID manager 801-1, Mobility Management 801-2 and Offload Function 801-3.
  • UE ID manager 801-1 may be configured to refer to Subscriber Database 802-3 in the memory 802 to manage UEs that are associated with the apparatus 800.
  • Mobility Management 801-2 may utilize RAN interface 803 to communicate with the RAN and associated base station to process the receiving or transferring of UEs.
  • Offload function 801-3 may be configured to receive a request to load balance the UEs associated with the RAN and refer to subscriber database 802-3 to determine UEs to offload.
  • Memory 802 may manage information such as RAN management 802-1, UE Management 802-2, and subscriber database 802-3.
  • FIG. 9 illustrates an example base station upon which example implementations can be implemented.
  • the block diagram of a base station 900 in the RAN of the example implementations is shown in FIG. 9, which could be a macro base station, a pico base station, an eNodeB and so forth.
  • the base station 900 may include the following modules: the Central Processing Unit (CPU) 901, the baseband processor 902, the transmission/receiving (Tx/Rx) array 903, the X2/Xn interface 904, and the memory 905.
  • the CPU 901 is configured to execute one or more modules or flows as described, for example, in FIGS. 3, 4 and 6 to transmit cached content for a given UE by communicating with one or more other base stations through the X2/Xn interface 904 that have the cached content associated with the cached content stored in the memory 905 for the given UE; and join a CoMP set to provide the content to the given UE either by obtaining the content through the CDN such as apparatus 800, or by transmitting the cached content from memory 905 as part of the CoMP set.
  • the baseband processor 902 generates baseband signaling including the reference signal and the system information such as the cell-ID information.
  • the Tx/Rx array 903 contains an array of antennas which are configured to facilitate communications with associated UEs Associated UEs may communicate with the Tx/Rx array to transmit signals containing channel quality information, precoding matrix index, received signal strength and so forth.
  • the X2/Xn interface 904 is used to exchange information between one or more base stations and/or the apparatus of FIG. 8 via a backhaul to join/leave a CoMP set, obtain cached content from other base stations for transmitting to the given UE, obtain the content from the CDN to transmit to the UE, and so on.
  • the memory 905 can be configured to store and manage cached content as provided by the CDN.
  • Memory 905 may take the form of a computer readable storage medium or can be replaced with a computer readable signal medium as described below.
  • FIG. 10 illustrates an example user equipment upon which example implementations can be implemented.
  • the UE 1000 may involve the following modules: the CPU module 1001, the Tx/Rx array 1002, the baseband processor 1003, and the memory 1004.
  • the CPU module 1001 can be configured to perform one or more functions, such as execution of one or more applications (e.g., voice, internet, video streaming, etc.) as well as the requesting and receiving of cached content from the associated base station.
  • applications e.g., voice, internet, video streaming, etc.
  • the Tx/RX array 1002 may be implemented as an array of one or more antennas to communicate with the one or more base stations.
  • the memory 1004 can be configured to store cached information from the base station.
  • the baseband digital signal processing (DSP) module 1003 can be configured to perform one or more functions, such as to conduct measurements to generate the position reference signal for the serving base station to estimate the location of the UE.
  • DSP digital signal processing
  • Example implementations require physical manipulations of tangible quantities for achieving a tangible result.
  • steps carried out require physical manipulations of tangible quantities for achieving a tangible result.
  • discussions utilizing terms such as “processing,”“computing,”“calculating,”“determining,”“displaying,” or the like can include the actions and processes of a computer system or other information processing device that manipulates and transforms data represented as physical (electronic) quantities within the computer system’s registers and memories into other data similarly represented as physical quantities within the computer system’s memories or registers or other information storage, transmission or display devices.
  • Example implementations may also relate to an apparatus for performing the operations herein.
  • This apparatus may be specially constructed for the required purposes, or it may include one or more general-purpose computers selectively activated or reconfigured by one or more computer programs.
  • Such computer programs may be stored in a computer readable medium, such as a computer-readable storage medium or a computer-readable signal medium.
  • a computer-readable storage medium may involve tangible mediums such as, but not limited to optical disks, magnetic disks, read-only memories, random access memories, solid state devices and drives, or any other types of tangible or non-transitory media suitable for storing electronic information.
  • a computer readable signal medium may include mediums such as carrier waves.
  • aspects of the example implementations may be implemented using circuits and logic devices (hardware), while other aspects may be implemented using instructions stored on a machine-readable medium (software), which if executed by a processor, would cause the processor to perform a method to carry out implementations of the present application. Further, some example implementations of the present application may be performed solely in hardware, whereas other example implementations may be performed solely in software. Moreover, the various functions described can be performed in a single unit, or can be spread across a number of components in any number of ways. When performed by software, the methods may be executed by a processor, such as a general purpose computer, based on instructions stored on a computer-readable medium. If desired, the instructions can be stored on the medium in a compressed and/or encrypted format.

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

Abstract

Des modes de réalisation donnés à titre d'exemple concernent des systèmes et des procédés permettant de modifier des stratégies coopératives au niveau du réseau d'accès radio (RAN) en vue de tenir compte du contenu mis en cache au niveau des noeuds B améliorés en plus des informations de qualité de canal. Il en résulte une réduction du trafic réseau général et une amélioration de la qualité d'expérience pour l'utilisateur.
PCT/US2015/011254 2015-01-13 2015-01-13 Mise en cache coopérative basée sur la localisation au niveau du réseau d'accès radio WO2016114767A1 (fr)

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PCT/US2015/011254 WO2016114767A1 (fr) 2015-01-13 2015-01-13 Mise en cache coopérative basée sur la localisation au niveau du réseau d'accès radio

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PCT/US2015/011254 WO2016114767A1 (fr) 2015-01-13 2015-01-13 Mise en cache coopérative basée sur la localisation au niveau du réseau d'accès radio

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108156617A (zh) * 2017-11-23 2018-06-12 东南大学 一种雾无线接入网中基于图论的协作缓存方法
KR101937558B1 (ko) 2017-03-29 2019-01-11 한국과학기술원 저장 장치 활용 기지국의 저장 용량 및 백홀 사용량 최적화 방법 및 송신 장치

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US20100322171A1 (en) * 2009-06-17 2010-12-23 Qualcomm Incorporated Resource block reuse for coordinated multi-point transmission
US20130176988A1 (en) * 2010-02-12 2013-07-11 Interdigital Technology Corporation Data split between multiple sites
US20140071841A1 (en) * 2012-09-12 2014-03-13 Telefonaktiebolaget Lm Ericsson (Publ) Method for inter-cell downlink interference minimization via comp

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US20100322171A1 (en) * 2009-06-17 2010-12-23 Qualcomm Incorporated Resource block reuse for coordinated multi-point transmission
US20130176988A1 (en) * 2010-02-12 2013-07-11 Interdigital Technology Corporation Data split between multiple sites
US20140071841A1 (en) * 2012-09-12 2014-03-13 Telefonaktiebolaget Lm Ericsson (Publ) Method for inter-cell downlink interference minimization via comp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101937558B1 (ko) 2017-03-29 2019-01-11 한국과학기술원 저장 장치 활용 기지국의 저장 용량 및 백홀 사용량 최적화 방법 및 송신 장치
CN108156617A (zh) * 2017-11-23 2018-06-12 东南大学 一种雾无线接入网中基于图论的协作缓存方法

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