GB2358765A - Download of data via a cache server - Google Patents

Download of data via a cache server Download PDF

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Publication number
GB2358765A
GB2358765A GB0001600A GB0001600A GB2358765A GB 2358765 A GB2358765 A GB 2358765A GB 0001600 A GB0001600 A GB 0001600A GB 0001600 A GB0001600 A GB 0001600A GB 2358765 A GB2358765 A GB 2358765A
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United Kingdom
Prior art keywords
terminal
communications
data
data rate
communications terminal
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Granted
Application number
GB0001600A
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GB2358765B (en
GB0001600D0 (en
Inventor
Wolfgang Zirwas
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to GB0001600A priority Critical patent/GB2358765B/en
Publication of GB0001600D0 publication Critical patent/GB0001600D0/en
Publication of GB2358765A publication Critical patent/GB2358765A/en
Application granted granted Critical
Publication of GB2358765B publication Critical patent/GB2358765B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/182—Network node acting on behalf of an other network entity, e.g. proxy
    • 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
    • H04L67/01—Protocols
    • H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
    • 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
    • H04L67/52—Network services specially adapted for the location of the user terminal
    • 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
    • H04L67/5681—Pre-fetching or pre-delivering data based on network characteristics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Abstract

Data to be downloaded from a high speed backbone network to a mobile subscriber 102 is done so through a cache server 110. Data is downloaded at a relatively slow rate from the backbone network, for example up to 2Mb/s and stored ready for retransmission at a high data rate, for example up to 56Mb/s, to the mobile subscriber. The connection between the backbone network and the cache server may be provided by UMTS, and the connection between the cache server and the mobile subscriber by HiperLAN 2. Transmission of data to the mobile subscriber may be in response to the route or location of the recipient.

Description

2358765 COMMUNICATIONS SYSTEM AND METHOD OF DOWNLOADING DATA The present
invention relates to a communications system and a method of downloading data, the communications system being of the type operating at a high data rate and being capable of communicating with a high speed backbone network, for example, a HiperLAN to network and a universal mobile telecommunications system (UMTS).
A HiperLAN 2 is an example of a high-speed local area network capable of supporting data rates in excess of 20Mb/s for mobile subscribers having, for example, laptop or notebook computers. HiperLAN 2 uses an orthogonal frequency division multiplex (OFDM) multiple access scheme, such a scheme being particularly suitable in geographic locations having a high amount of multi-path interference known as "hot spots", for example, offices or airport lounges. The cell radius of the HiperLAN 2 is restricted to a few hundred meters due to the maximum transmit power of the system being 30dBm.
In applications where a, terminal of a subscriber (hereinafter referred to as the "subscriber terminal") is highly mobile, for example, where the subscriber terminal is located in a motor vehicle, the period of time available, during which data can be downloaded from a HiperLAN 2 Access Point to the subscriber terminal is limited. Furthermore applications requiring a large initial quantity of data to be downloaded worsen the problem of being able to successfully download data within a short, access, period.
In " Hot Spot" locations such as airports, railway stations or offices, the data to be transmitted by a HiperLAN 2 base station can be 2 provided at a satisfactory rate from a fast backbone network in order to satisfy the demands of most applications. However, where access points are located in locations where access to the fast backbone network is not readily available, for example at a traffic light, it is not possible to provide the data at a sufficiently fast rate to satisfy most applications. One solution is to provide a number of additional access points en route so as to provide coverage for the mobile subscriber and hence a sufficient period of time to enable all required data to be downloaded via the HiperLAN 2 base station. However, this solution increases the cost of the HiperLAN 2 due to the increased number of access points required.
An in-vehicle navigation system is an example of an application requiring a large initial amount of data to be downloaded to the subscriber terminal when mobile. A system designed to provide the subscriber with position-relevant data, for example, information pertaining to restaurants, museums, fairs or exhibitions including images or short video scenes is another example of an application requiring a large initial amount of data to be downloaded to the subscriber terminal when mobile. With both of the above applications, it is necessary to download high initial amounts of data to the subscriber terminal, a smaller data rate being required thereafter for updates. In the case of an in-vehicle navigation system, it may be necessary for the subscriber to download a map relating to a locality to a memory unit of the vehicle. Thereafter, updates may need to be provided, for example, detaiis of new streets, detours, traffic or telematic information.
In order to obviate the need to download a high initial amount of data, it has been proposed that, in the case of the in-vehicle navigation system, a basic map of the locality is stored on a compact disc Read Only 3 Memory (CD-ROM), or similar medium, and used by the in-vehicle system. Consequently, the need to transmit updates to the subscriber only remains, the updates being delivered at lower data rates, for example over Digital Audio Broadcast (DAB) channels. Hence the amount of data to be downloaded is significantly reduced. However, the provision of a CDROM of the basic map within the vehicle requires that the appropriate CD-ROM is purchased in advance and restricts the subscriber to applications which support CD-ROMs. Additionally, in the case of information which requires frequent updates, for example local information, this solution will fail, because it may not be economical to update CDs frequently, for example, in respect of fairs and exhibitions which may be held every few weeks.
It is therefore an object of the present invention to obviate, or at least mitigate, the above described disadvantages.
According to a first aspect of the present invention, there is provided a communication system comprising a first communications terminal having a first data rate for downloading data from a high speed communications network to a recipient terminal, wherein a second communications terminal having a second data rate is coupled to the first communications terminal via a processor and storage means, the first data rate being greater than the second data rate; the processor and the storage means are arranged to cache data received by the second communications ten-ninal for transmission by the first communications terminal.
According to a. second aspect of the present invention, there is provided a subscriber terminal for a communications system, the subscriber terminal being capable of communicating with a first communications terminal having a first data rate for downloading data 4 from a high speed communications network to a recipient terininal, wherein the first communications terminal is coupled to a second communications terminal having a second data rate via a processor and storage means, the first data rate being greater than the second data rate, and the processor and the storage means are arranged to cache data received by the second communications terminal for transmission by the first communications terminal.
According to a third aspect of the present invention, there is provided a communications terminal having a first data rate for downloading data from a high speed communications network to a recipient terminal and comprising interfacing means, wherein a second communications terminal having a second data rate is coupled to the interfacing means via a processor and storage means, the first data rate being greater than the second data rate, and the processor and storage means are capable of caching data received by the second communications terminal and for transmission by the first communications terminal.
According to a fourth aspect of the present invention, there is provided a cache system for caching data for a first communications terminal having a first data rate for downloading data from a high speed network, wherein a second communications terminal having a second data rate is coupled to the first communications terminal via a processor and storage means, the first date rate being greater than the second data rate, and the processor and storage means are arranged to cache data received by the second communications terminal for transmission by the first communications terminal.
According to a fifth aspect of the present invention, there is provided a method of downloading data from a high speed communications network via a first communications terininal to a recipient terminal, wherein the first communications terminal has a first data rate and is coupled to a second communications terminal having a second data rate via a processor and storage means, the first data rate being greater than the second data rate, and the processor and the storage means are arranged to cache data transmitted between the first communications terminal and the second communications terminal., the method comprising the steps of- downloading data from the high speed network using the second communications terminal at the second data rate; caching the data using the processor and storage means; forwarding the data to the first communications terminal from the storage means at a data rate higher than the second data rate, and transmitting the data from the first communications terminal to the recipient terminal at the first data rate.
It is thus possible to provide a communications systems capable of delivering initial high quantities of data to individually addressed Access Points for such applications as in-vehicle navigation systems and location-dependant information services, in spite of a limited access period of the HiperLAN 2 system. The communications system is also not limited to applications requiring CD-ROMs, or other such media, and access to the high speed backbone network is economical. Additionally, the number of Access Points required by the HiperLAN 2 is kept to a minimum.
6 Other, preferred, features and advantages are set forth, and will become apparent from, the following description and appended dependant claims.
At least one embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a schematic diagram of an application of an embodiment of the present invention; Figure 2 is a schematic diagram of a mobile terminal; Figure 3 is a schematic diagram of a HiperLAN 2 base station, Figure 4 is a schematic diagram of a UMTS terminal; Figure 5 is a schematic diagram of a UMTS base station; Figure 6 is a schematic diagram of a cache server, and Figure 7 is a flow diagram of a method constituting an embodiment of the invention.
In a HiperLAN 2 communications system 100 operating at a data rate of up to about 56 Mbit/s, a mobile terminal 102 is capable of communicating with a HiperLAN 2 base station 104 via a radio frequency (RF) interface 106 is located in a set of traffic lights 114, the HiperLAN 2 base station 104 being coupled to a UMTS terminal 108 via a cache server 110. The UMTS terminal 108 is capable of communicating with a high-speed backbone network (not shown) via a UMTS network 112. The HiperLAN 2 base station 104 and the UMTS terminal 108 are located close to a power source, for example, on a set of traffic lights, by a toll booth, underpass, or other such "hot spots".
Although, in the present example, the HiperLAN 2 base station 104 is coupled to the UMTS terminal 108, other lower-data rate communications systems, having a data rate of up to about 2Mbit/s, can 7 be employed in place of the UMTS, for example a Global System for Mobile Communications (GSM) or a General Packet Radio Service (GRPS).
Referring to Figure 2, the mobile terminal 102 comprises a mobile terminal antenna 200 coupled to a mobile terminal duplexer 202, a first terminal of the duplexer 202 being coupled to a mobile terminal microprocessor 204 via a mobile terminal transmitter chain 206. A second terminal of the mobile terminal duplexer 202 is also coupled to the mobile terminal microprocessor 204 via a mobile terminal receiver chain 208. The microprocessor 204 is coupled to a microphone 218, a keypad 216, a loudspeaker 214, and a display unit 212, for example, a liquid crystal display (LCD unit), and a mobile terininal volatile memory unit 2 1 Q, for example, a Random Access Memory (RAM). A mobile terminal input/output interface 214 for coupling the mobile terminal 102 to other devices, for example, a lap-top or notebook computer, or an in-vehicle computer, is coupled to the mobile terminal microprocessor 204. The HiperLAN 2 base station 104 (Figure 3) comprises a HiperLAN 2 antenna 300 coupled to a HiperLAN 2 base station duplexer 302, a first terminal of the HiperLAN 2 base station duplexer 302 being coupled to a HiperLAN 2 base station microprocessor 304 via a HiperLAN 2 base station transmitter chain 306. A second terminal of the HiperLAN 2 base station duplexer 302 is also coupled to the HiperLAN 2 base station microprocessor 304 via a HiperLAN 2 base station receiver chain 308. The HiperLAN 2 base station microprocessor 304 is coupled to a HiperLAN 2 base station volatile memory unit 3 10, for example, a RAM. The HiperLAN 2 base station microprocessor 304 is also coupled to a HiperLAN 2 base station input/output interface 312.
', 0 8 The UMTS terminal 108 (Figure 4) comprises a UNITS terminal antenna 400 coupled to a UNITS terminal duplexer 402, a first terminal of the UMTS terminal duplexer 402 being coupled to a UMTS terminal microprocessor 404 via a transmitter chain 406. Additionally, a second terminal of the UMTS terminal duplexer 402 is coupled to the UMTS terminal microprocessor 404 via a receiver chain 408. The UMTS terminal microprocessor 404 is coupled to a UMTS terminal volatile memory unit 410, for example a RAM. The UMTS terminal microprocessor 404 is also coupled to a UMTS terminal input/output interface 412.
Referring to Figure 5, a UMTS base station 500 comprises a UMTS base station antenna 501 coupled to a UMTS base station duplexer 502, a first terminal of the UMTS base station duplexer 502 is coupled to a UMTS base station microprocessor 504 via a UMTS base station transmitter chain 506. A second terminal of the UMTS base station duplexer 502 is coupled to the UMTS base station microprocessor 504 via a UMTS base station receiver chain 508. The UMTS base station microprocessor 504 is also coupled to a UMTS base station volatile memory unit 5 10, for example, a RAM. Additionally, the UMTS base station microprocessor 504 is also coupled to the high-speed backbone network 512, via which data to be downloaded from the HiperLAN 2 base station 104 is obtained.
Referring to Figure 6, the cache server I 10 comprises a cache microprocessor 600 coupled to a storage unit 602. The storage unit can be any storage device known in the art, for example, a hard disc drive, a volatile cache memory, such as RAM, or a magneto-optic disc drive. The cache microprocessor 600 is coupled to a UMTS interface 604, the 9 UMTS interface 604 being coupled to the UMTS terminal input/output interface 412. A HiperLAN 2 interface 606 is also coupled to the cache microprocessor 600. The HiperLAN 2 interface 606 is also coupled to the HiperLAN 2 base station input/output interface 312.
In operation (Figure 7), data to be transmitted to the mobile HiperLAN 2 terminal 102 is transmitted from the high-speed backbone network 512 to the UMTS base station 500 (step 700). The UMTS base station 500 transmits (step 702) the data received from the high speed backbone network 512 to the UMTS terminal 108 at a lower data rate than the rate at which the data was received from the high-speed backbone network 512, for example 2 Mb/s, using an Internet Protocol (IP). The data is received by the UMTS terminal 108 from the UMTS base station 500 and forwarded to the cache server I 10 via the UMTS terminal input/output interface 412 and the UMTS interface 604. The data received by the cache 110 is stored by the cache microprocessor 600 in the cache memory 602 (step 704). The cache memory 602 acts as a flow control, enabling data received at a rate of 2 Mb/s by the UMTS terminal 108 to be transmitted by the HiperLAN 2 base station 104 at a rate in excess of 20 Mb/s. The data is transferred to the HiperLAN 2 base station 104 at a higher data rate than the data rate at which the data was received by the cache server 110. The HiperLAN 2 base station 104 then determines the location of the subscriber and the route being taken by the mobile terminal 102 (step 706) and awaits the arrival of the mobile terminal 102 (step 708) within the cell supported by the HiperLAN 2 base station 104. When the mobile terminal 102 is within the cell, the HiperLAN 2 base station 104 transmits the cached data to the HiperLAN 2 terminal 102, by transmission of the data from the cache server 110 via the Hiperl-AN 2 interface 606 and the HiperLAN 2 base station input/output interface 312.
It should be appreciated that although in the above example, the location and route of the mobile terminal 102 are determined (step 706) and the arrival of the mobile terminal 102 is awaited (step 708), these steps are optional, for example in the case where the mobile terminal 102 is waiting at the set of traffic lights 114 and requests data to be downloaded. However, if required, the location and route of the mobile terminal 102 can be obtained via the UMTS or GSM/GPRS.
1

Claims (17)

CLAIMS:
1. A communications system comprising a first communications terminal having a first data rate for downloading data from a high speed communications network to a recipient terminal, wherein a second communications terminal having a second data rate is coupled to the first communications terminal via a processor and storage means, the first data rate being greater than the second data rate; the processor and the storage means are arranged to cache data received by the second communications terminal for transmission by the first communications terminal.
2. A communications system as claimed in Claim 1, wherein the first data rate is up to about 2Mbit/s.
3. A communications system as claimed in Claim I or Claim 2, wherein the second data rate is up to about 56 Mbit/s.
4. A communications system as claimed in any one of the preceding claims, wherein the first communications terminal is arranged to operate in a HiperLAN.
5. A communications system as claimed in any one of the preceding clainis, wherein the second communications terminal is arranged to operate in a cellular communications network.
6. A communications system as claimed in Claim 1, wherein the storage means is arranged to pre-store a predetermined amount of data 12 received from the second communications terminal prior to transmission by the first communications terminal.
7. A communications system as claimed in Claim 6, further comprising means for determining a location of the recipient terminal and means for determining a route being followed by the recipient terminal, wherein the first communications terminal is arranged to transmit the data to the recipient terminal when the recipient is located within a reception range of the first communications terminal.
8. A subscriber terminal for a communications system, the subscriber terminal being capable of communicating with a first communications terminal having a first data rate for downloading data from a high speed communications network to a recipient terminal, wherein the first communications terminal is coupled to a second communications terminal having a second data rate via a processor and storage means, the first data rate being greater than the second data rate, and the processor and the storage means are arranged to cache data received by the second communications terminal for transmission by the first communications terminal.
9. A communications terminal having a first data rate for downloading data from a high speed communications network to a recipient terminal and comprising interfacing means, wherein a second communications terminal having a second data rate is coupled to the interfacing means via a processor and storage means, the first data rate being greater than the second data rate, and the processor and the storage 13 means are capable of caching data received by the second communications terminal for transmission by the first communications terminal.
10. A cache system for caching data for a first communications terminal having a first data rate for downloading data from a high speed network, wherein a second communications terminal having a second data rate is coupled to the first communications terminal via a processor and storage means, the first data rate being greater than the second data rate, and the processor and the storage means are arranged to cache data received by the second communications terminal for transmission by the first communications terminal.
11. A method of downloading data from a high speed communications network via a first communications terminal to a recipient terminal, wherein the first communication terminal has a first data rate and is coupled to a second communications terminal having a second data rate via a processor and storage means, the first data rate being greater that the second data rate, and the processor and the storage means are arranged to cache data transmitted between the first communications terminal and the second communications terminal, the method comprising the steps of: downloading data from the high speed network using the second communications terminal at the second data rate; caching the data using the processor and storage means; forwarding the data to the first communications terminal from the storage means at a data rate higher than the second data rate, and 14 transmitting the data from the first communications terminal to the recipient tenninal at the first data rate.
12. A method as claimed in Claim 11, further comprising the step of determining the location of the recipient terminal.
13. A method as claimed in Claim 12, further comprising the step determining the route of the recipient terminal.
14. A method as claimed in Claim 12, further comprising the step of transmitting the data from the first communications terminal to the recipient terminal in response to the location of the recipient terminal.
15. A method as claimed in Claim 13, further comprising the step of transmitting the data from the first communications terminal to the recipient terminal in response to the route of the recipient terminal.
16. A communications system substantially as hereinbefore described with reference to Figures I to 6.
17. A method of downloading data from a high speed communications network substantially as hereinbefore described with reference to Figure 7.
GB0001600A 2000-01-25 2000-01-25 Communications system and method of downloading data Expired - Fee Related GB2358765B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834419A1 (en) * 2001-12-27 2003-07-04 France Telecom SYSTEM FOR TRANSMITTING DATA FROM A SERVER TO A MOBILE TERMINAL
EP1333627A1 (en) * 2002-01-30 2003-08-06 Alcatel Method for establishing a connection between terminals having a short-range wireless communication interface
WO2005039114A1 (en) * 2003-10-16 2005-04-28 Telefonaktiebolaget Lm Ericsson (Publ) Access to cdma/umts services over a wlan access point, using a gateway node between the wlan access point and the service providing network
US20070055660A1 (en) * 2005-09-08 2007-03-08 Deere & Company, A Delaware Corporation System and method for anticipatory downloading of data
CN106254474A (en) * 2016-08-09 2016-12-21 北京航空航天大学 Heterogeneous nodes cooperation caching method based on fountain codes under car networking

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139047A (en) * 1983-04-22 1984-10-31 Gen Electric Plc Data transfer systems

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139047A (en) * 1983-04-22 1984-10-31 Gen Electric Plc Data transfer systems

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834419A1 (en) * 2001-12-27 2003-07-04 France Telecom SYSTEM FOR TRANSMITTING DATA FROM A SERVER TO A MOBILE TERMINAL
WO2003056761A1 (en) * 2001-12-27 2003-07-10 France Telecom System for data transmission from a server to a mobile terminal
EP1333627A1 (en) * 2002-01-30 2003-08-06 Alcatel Method for establishing a connection between terminals having a short-range wireless communication interface
WO2005039114A1 (en) * 2003-10-16 2005-04-28 Telefonaktiebolaget Lm Ericsson (Publ) Access to cdma/umts services over a wlan access point, using a gateway node between the wlan access point and the service providing network
US20070055660A1 (en) * 2005-09-08 2007-03-08 Deere & Company, A Delaware Corporation System and method for anticipatory downloading of data
US9426230B2 (en) * 2005-09-08 2016-08-23 Deere & Company System and method for anticipatory downloading of data
CN106254474A (en) * 2016-08-09 2016-12-21 北京航空航天大学 Heterogeneous nodes cooperation caching method based on fountain codes under car networking

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Publication number Publication date
GB2358765B (en) 2004-05-19
GB0001600D0 (en) 2000-03-15

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