WO2004028094A1 - Procede et systeme de gestion des ressources dans un reseau de communications - Google Patents

Procede et systeme de gestion des ressources dans un reseau de communications Download PDF

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Publication number
WO2004028094A1
WO2004028094A1 PCT/FI2002/000758 FI0200758W WO2004028094A1 WO 2004028094 A1 WO2004028094 A1 WO 2004028094A1 FI 0200758 W FI0200758 W FI 0200758W WO 2004028094 A1 WO2004028094 A1 WO 2004028094A1
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WO
WIPO (PCT)
Prior art keywords
session
resources
setup
detecting
transport
Prior art date
Application number
PCT/FI2002/000758
Other languages
English (en)
Inventor
Eero Sillasto
Pedro Serna
Original Assignee
Nokia Corporation
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 Nokia Corporation filed Critical Nokia Corporation
Priority to PCT/FI2002/000758 priority Critical patent/WO2004028094A1/fr
Priority to AU2002325975A priority patent/AU2002325975A1/en
Publication of WO2004028094A1 publication Critical patent/WO2004028094A1/fr
Priority to US11/085,623 priority patent/US20050174952A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/19—Flow control; Congestion control at layers above the network layer
    • H04L47/193—Flow control; Congestion control at layers above the network layer at the transport layer, e.g. TCP related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/824—Applicable to portable or mobile terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/826—Involving periods of time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/83—Admission control; Resource allocation based on usage prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless

Definitions

  • the present invention relates to telecommuni- cation systems.
  • the present invention relates to a novel and improved method and system for reserving transport resources in a communication network.
  • Non Real-Time (NRT) traffic is transmitted as packets over usually unreliable network.
  • the network can be either a fixed or a wireless one. Because the network is unreliable and weak for congestion, special transport (and transaction) protocols have been designed. The most common protocol examples are the TCP (Transmission Control Protocol) , and for mobile terminals, the WTP (Wireless Transaction Protocol). Both of them use the session concept. The transmission of user data may be performed only if both, server and client know that there is a session between them.
  • TCP Transmission Control Protocol
  • WTP Wireless Transaction Protocol
  • a session is a series of interactions that occur during the span of a single connection between two communication endpoints.
  • one endpoint requests a connection with another specified endpoint, and if that endpoint agrees the connection request, the endpoints take turns exchanging commands and data.
  • the session begins when the connection is established at both ends and termi- nates when the connection is ended.
  • a connection is maintained while the two endpoints are communicating back and forth in a conversation or session of some duration.
  • Some connections and sessions last only long enough to send a message in one direction. However, other sessions may last longer, usually with one or both of the communicating parties able to terminate it.
  • each session is related to a particular port, a number that is associated with a particular upper layer application.
  • Each' transport or transaction protocol has its own messages, which can be distinguished from other packets.
  • Radio communication systems such as mobile networks, have started to provide packet data services for the users in addition to circuit switched services in the last few years.
  • a packet data service is typi- cally a service in which information is transmitted within data packets. The sizes and lengths of the data packets may vary.
  • Information is typically carried by means what are often referred to as packet data bearers .
  • the transmission speed of a bearer is defined by a parameter referred to as bit rate. More particularly, bit rate defines the bit rate allocated for a user of the packet data services. For example, in the WCDMA (Wideband Code Division Multiple Access) based systems bit rate values such as 16, 32, 64, 128 and 384 kbits may be used.
  • WCDMA Wideband Code Division Multiple Access
  • NRT packet services via an air interface are different from real-time (RT) services (i.e. circuit switched services) .
  • Packet data is bursty by its nature. The required bit rate can change rapidly from zero to hundreds of kilobits per second. Packet data tolerates longer delay times than circuit switched services. Therefore, the packet data traffic may be more readily controlled from a radio access network point of view. For example, in interac- tive services a user must get resources within a reasonable time, but in. background type services data can be transmitted when free radio interface capacity can be allocated for the transmission.
  • the applicable trans- port channels for packet data transfer are e.g. Dedicated Transport Channel (DCH) in uplink and downlink direction, Random Access Channel (RACH) in uplink di- rection, Forward Access Channel (FACH) in downlink direction, Common Packet Channel (CPCH) in uplink direction, High Speed Downlink Packet Access (HSDPA) in downlink direction, and Downlink Shared Channel (DSCH) in downlink direction.
  • DCH Dedicated Transport Channel
  • RACH Random Access Channel
  • FACH Forward Access Channel
  • CPCH Common Packet Channel
  • HSDPA High Speed Downlink Packet Access
  • DSCH Downlink Shared Channel
  • telecommunication networks In many telecommunication networks transport resources have to be " reserved, allocated and/or setup beforehand. These telecommunication networks especially comprise wireless networks, e.g. the UTRAN (UMTS Terrestrial Radio Access Network) , GERAN (Gsm Edge Radio Access Network) , CDMA2000 (Code Division Multiple Access) , and WLAN (Wireless Local Area Network) . Naturally, there may exist also wireline networks in which some or all of the transport resources must be reserved.
  • UTRAN UMTS Terrestrial Radio Access Network
  • GERAN Gsm Edge Radio Access Network
  • CDMA2000 Code Division Multiple Access
  • WLAN Wireless Local Area Network
  • the setup messages of a session are small in size, e.g. the TCP/IP setup messages are order of 40 bytes with the IPv4 and 60 bytes with the IPv6.
  • These setup messages are user plane traffic for the UTRAN, but as they are probably transmitted in the radio interface by means of common channel, they will probably not trigger the dedicated channel or shared channel allocation.
  • the use of common channels means that no dedicated resources need to be reserved in the lub interface so there is not any delay incurred due to the lub connection setup.
  • the lub interface is UTRAN specific interface between the RNC and BTS (or Node B) .
  • the lub interface is described in more detail in the 3 rd Generation Partnership Project (3GPP) specifications 3GPP TS 25.425, 3GPP TS 25.426, 3GPP TS 25.427, and 3GPP TS 25.430 - 3GPP TS 25.435.
  • 3GPP 3 rd Generation Partnership Project
  • FIG. 1 describes the signaling flow for the setup of a TCP connection when HyperText Transfer Protocol (HTTP) is used.
  • HTTP HyperText Transfer Protocol
  • TCP SYN message The synchronization of the requesting end's (client) sequence num- ber. This message has the SYN flag in the
  • TCP SYN message The synchronization of the server end's sequence number. This message has the SYN flag in the TCP header. 12. The client acknowledges the server's SYN.
  • a possible HTTP request can be sent to the server within this message.
  • the server responds to the HTTP request by starting the data transmission and sends the first packet.
  • the packet arrives at the RNC, which notices that the dedicated channel should be allocated.
  • the RNC has to setup the lub resource. It sends a NBAP message to Node B: Radio Link
  • the Node B responds to the RNC: Radio Link Setup Response.
  • a dedicated channel is allocated and the data packet is transmitted to the mobile terminal . ⁇ . .
  • the lub setup cannot happen before the first packets of the data session arrive if the small setup packets are transmitted on common channels. If all user plane traffic triggers dedicated channel (DCH or DCH/DSCH) allocation, the lub setup occurs when the dedicated channel is allocated for the first setup message. However, the user experiences the lub setup delay.
  • DCH dedicated channel
  • the present invention describes a method and system for reserving transport resources in a communication network.
  • the communication network is e.g. the UMTS Terrestrial Radio Access Network (UTRAN) , Internet Protocol Radio Access Network (IP-RAN) , GSM EDGE Radio Access Network (GERAN) , Code Division Multiple Access 2000 (CDMA2000) , Wireless Local Area Network (WLAN) or any other communication network wherein transport resources have to be reserved for data transmissions.
  • the system comprises a communication network, a plurality of nodes in connection with the communication network, the nodes comprising at least a sender node and receiver node. A session is setup for a data transmission between the sender node and receiver node.
  • the sender node is e.g.
  • a mobile terminal and the receiver node e.g. a server providing data services for the mobile terminal.
  • Necessary resources are reserved for the data transmission between the sender node and receiver node ..When, the resources are reserved they can be used for the data transmission between the sender node and receiver node . In prior-art solutions, the reservation of needed resources is not done until there is data ready to be sent. In other words, actions are sequential. This causes unnecessary delay in the setup processes for data transmissions.
  • the present invention is based on the fact that transport protocol session setup messages can be distinguished from other messages . In the present invention, one or more identifiers are determined to be tracked. These identifiers are chosen to be the ones present in the setup messages of a session.
  • part or all of the transport resources needed for the data transmission are reserved between the sender and receiver befor - hand. Reserving here means that actual resources may be reserved and/or that setup of a resource is done.
  • the reservation of resources may comprise reservation of radio or wireline resources or both.
  • a timer is started when detecting the predetermined identifier (s) used in one or more setup messages of the session. When the timer expires, part or all of the resources needed for the data transmission are reserved.
  • the session is a non real-time data (NRT) transmission session.
  • the session is a Transmission Control Protocol or Wireless Transmission Protocol session.
  • a SYN bit (SYN bit on) of a TCP message can be used as a predeter- mined identifier for triggering the resource reservation.
  • The. ⁇ system of the present invention comprises means for determining one or more identifiers to be tracked included in one or more setup messages of a session, means for detecting the identifier (s) within one or more setup messages of the session; and means for reserving part or all of the transport resources needed for the data transmission between the sender node and receiver node beforehand in response to de- tecting the identifier (s) within one or more setup messages of the session with means for detecting.
  • the system further comprises a timer for measuring time after detecting the predetermined identifier(s) within one or more setup messages of the session with means for detecting.
  • Means for reserving are arranged to reserve part or all of the transport resources needed for the data transmission between the sender node and receiver node beforehand in response to de- tecting the identifier (s) within one or more setup messages of the session with means for detecting when the timer expires .
  • means for detecting are arranged to choose an appro- priate TCP session setup message with the SYN bit on for the reservation of resources .
  • means for detecting the identifier (s) within one or more setup messages of the session are arranged in the Packet Data Convergence Protocol (PDCP) layer of the Radio Network Controller (RNC) of the UTRAN.
  • PDCP Packet Data Convergence Protocol
  • RNC Radio Network Controller
  • Fig 1 is a prior-art signaling flow diagram for the setup of a TCP session when HyperText Transfer Protocol (HTTP) is used
  • Fig 2 is a signaling flow diagram for the setup of a TCP session when HyperText Transfer Proto- col (HTTP) is used in accordance with the present invention
  • Fig 3 is a comparison of the user experienced delay between the standard session based data connection without resource prediction and session based data connection with resource prediction
  • Fig 4 illustrates an embodiment of a system in accordance with the present invention.
  • FIG. 2 describes a signalling flow for the setup of a TCP connection when the HTTP used.
  • the SYN messages trigger the lub resource setup.
  • the lub interface is an UTRAN specific interface between the RNC and BTS (or Node B) .
  • the lub interface is described in more detail in the 3 rd Generation Partnership Project (3GPP) specifications 3GPP TS 25.425, 3GPP TS 25,426, 3GPP TS 25.427 and 3GPP TS 25.430 - 3GPP TS 25.435.
  • 3GPP 3 rd Generation Partnership Project
  • the TCP session setup messages are read in the PDCP layer of the RNC.
  • Figure-- 2 will now be described .in more detail .
  • the RNC notices that the SYN flag is on and starts the lub resource setup. 21.
  • the RNC has to setup the lub resource. It sends a Node B Application part (NBAP) message to the Node B: Radio Link Setup. 22.
  • the node B responds to the RNC: Radio Link Setup Response.
  • NBAP Node B Application part
  • Transfer Mode (ATM) links e.g. ATM Adaptation Layer 2 (AAL2) , but they are not represented in this picture.
  • RRC Radio Resource Control
  • Figure 2 does not assume that the radio resources are reserved, or that a Dedicated Transport Channel (DCH) would be fully setup, which may also be performed.
  • 23. The TCP SYN message. The synchronization of the server SRV end's sequence number. This message has the SYN flag on in the TCP header. The triggering of the lub setup procedure point may be set to this second SYN message, or to the fact that this is the SYN in down link direction (usually it is the mobile terminal UE end that requests the service, and therefore, the setup the TCP) .
  • the mobile terminal UE acknowledges the server's SYN. This is a normal acknow- ledgement message. A possible HTTP request can be sent to server within this message. It is also possible to read the actual user data, and notice that this is the HTTP request, and trigger the lub setup.
  • the server SRV responds to the HTTP request by starting the data transmission and sends the first packet.
  • the packet arrives at the RNC, which notices that a dedicated channel should be allocated (or if the whole DCH allocation is performed after the triggering, it is already there) .
  • the lub resource has anyhow already been allocated.
  • a dedicated channel is allocated and the data packet is transmitted to mobile terminal UE.
  • the time between the first data packet arriving at the RNC and when it leaves the RNC is smaller than with the traditional method (the comparison is described in more detail in Figure 3) .
  • the user of the mobile terminal UE experiences this as better service and better bit rate.
  • the RRC messaging to the mobile terminal UE is not shown. In any case, the radio resources may or may not be reserved at the same time.
  • the radio resources are not reserved, but only the lub resources.
  • radio resources cannot be wasted. Therefore, the radio resources are reserved only after there is data to be sent to the mobile terminal .
  • timer functionality is used when reserving resources. When a TCP SYN message is detected, a timer, is started. With the timer it is possible to adjust the actual moment the resources are reserved. When the timer expires, part or all of the resources needed for the data transmission are reserved.
  • Figure 3 describes a comparison of the user experienced delay between the standard session based data connection without resource prediction and ses- sion based data connection with resource prediction.
  • Figure 3 represents the different phases of a. data session as a function of time. It shows how the delay penalty incurred by the reservation of resources can be avoided by triggering the resource reservation dur- ing the session setup phase.
  • the upper part of Figure 3 describes the standard data session setup.
  • the session is setup in a normal way (30) .
  • resources are reserved (32) .
  • the active data session transmission can start (33) .
  • the structure of the resource reservation process is sequential.
  • the lower part of Figure 3 describes the resource reservation method in accordance with the pres- ent invention.
  • the session is setup as in the standard solution (34) .
  • the session setup (34) comprises e.g. a TCP SYN message as described in Figure 2.
  • the TCP SYN message triggers the resource res- ervation (35, 36) .
  • the resources are already reserved and active data session transmission can start (37) .
  • the struc- ture of the resource reservation process differs from the standard solution.
  • the structure is now parallel.
  • Figure 4 represents an exemplary embodiment of the system in which the present invention can be used.
  • the architecture of Figure 4 comprises a communication network NET comprising the UTRAN radio access network.
  • the radio access network UTRAN is connected to the core network CN.
  • the UTRAN comprises a Radio Network Controller RNC controlling the radio access network UTRAN.
  • the mobile terminal UE is connected to the radio access network UTRAN via the radio interface. It must be noted that Figure 4 comprises only some of the components present in a real network.
  • the RNC comprises means for determining DM one or more identifiers to be tracked included in one or more setup messages of the session, means for detecting DET the identifier (s) within one or more setup messages of the session, and means for reserving RM part or all of the transport resources needed for the data transmission between the sender node UE and receiver node beforehand in response to detecting the identifier (s) within one or more setup messages of the session with means for detecting DET.
  • the RNC comprises also a timer TMR for measuring the time after detecting the identifier (s) within one or more setup messages of the session with means for detecting DET.
  • means for reserving RM are arranged to reserve part or all of the transport resources needed for the data transmission between the sender node UE and receiver node beforehand in re- sponse to detecting the identifier (s) within one or more setup messages of the session with means for detecting DET when the timer expires.
  • the above- mentioned means are in a preferred embodiment imple- mented with hardware and/or software components .
  • the total amount of time during which the resources are kept under reservation can be optimized by choosing the right trigger to start the reservation. This avoids reserving the resources too much in ad- vance before they are actually going to be used, which could mean degradations in the system capacity.
  • the right trigger can be defined by:
  • one or more of the aforementioned means are implemented in the PDCP layer of the RNC of the UTRAN.
  • the PDCP layer in UTRAN is used, for example, to compress different kinds of headers. It is possible to implement in the PDCP, or near it, a function that reads the TCP headers of the messages and recognizes the session setup messages (if the SYN bit is on) . The lub setup can then be performed beforehand.
  • the PDCP is specified, e.g. in the 3GPP TS 25 323 V5.1.0 (2002-06).
  • the present invention can be used in any other mobile or wireline network if there exists some resources that should be reserved and the reservation takes time.
  • the solution for reserving resources described in the present invention can be used to trigger resource reservation and/or setup of a re- source if the transport protocol session setup messages can be distinguished from other messages.
  • the need of resources is predicted by monitoring the TCP packets.
  • the session level setup messages indicate the forthcoming arrival of data and trigger the resource reservation.

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

Abstract

La présente invention concerne un procédé et un système de réservation des ressources de transport dans un réseau de communications, dans lequel les ressources de transport doivent être réservées pour les transmissions de données. Cette invention peut être utilisée dans n'importe quel réseau mobile ou à lignes métalliques s'il existe certaines ressources qui doivent être réservées et que la réservation prend du temps. La solution pour la réservation des ressources selon la présente invention peut être utilisée pour déclencher une réservation de ressource et/ou un établissement de ressource, si les messages d'établissement de session du protocole de transport peuvent être distingués des autres messages. Dans la forme de réalisation préférée de la présente invention, le besoin de ressources est prédit par la surveillance des paquets TCP. Les messages d'établissement du niveau de session indiquent l'arrivée prochaine de données et déclenchent l'affectation des ressources.
PCT/FI2002/000758 2002-09-23 2002-09-23 Procede et systeme de gestion des ressources dans un reseau de communications WO2004028094A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/FI2002/000758 WO2004028094A1 (fr) 2002-09-23 2002-09-23 Procede et systeme de gestion des ressources dans un reseau de communications
AU2002325975A AU2002325975A1 (en) 2002-09-23 2002-09-23 Method and system for resource management in a communication network
US11/085,623 US20050174952A1 (en) 2002-09-23 2005-03-22 Method and system for resource management in a communication network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2002/000758 WO2004028094A1 (fr) 2002-09-23 2002-09-23 Procede et systeme de gestion des ressources dans un reseau de communications

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US11/085,623 Continuation US20050174952A1 (en) 2002-09-23 2005-03-22 Method and system for resource management in a communication network

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP1675316A1 (fr) * 2004-12-23 2006-06-28 Evolium S.A.S. Notification de la capacité disponible d'une station de base dans un système HSDPA
GB2424802A (en) * 2005-03-30 2006-10-04 Nec Corp Transport resource control system for use in a mobile communications system
EP1792408A2 (fr) * 2004-09-14 2007-06-06 Motorola, Inc., A Corporation of the State of Delaware; Systeme et procede de connexion assistee par un reseau dans un environnement sans fil
CN101232627B (zh) * 2007-01-26 2012-01-11 中兴通讯股份有限公司 一种保证接入终端和接入网络的资源预留信息一致的方法
CN102638842A (zh) * 2012-04-11 2012-08-15 深圳市中兴移动通信有限公司 一种移动终端网络流量显示及预警方法

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1792408A2 (fr) * 2004-09-14 2007-06-06 Motorola, Inc., A Corporation of the State of Delaware; Systeme et procede de connexion assistee par un reseau dans un environnement sans fil
EP1792408A4 (fr) * 2004-09-14 2009-09-23 Motorola Inc Systeme et procede de connexion assistee par un reseau dans un environnement sans fil
EP1675316A1 (fr) * 2004-12-23 2006-06-28 Evolium S.A.S. Notification de la capacité disponible d'une station de base dans un système HSDPA
GB2424802A (en) * 2005-03-30 2006-10-04 Nec Corp Transport resource control system for use in a mobile communications system
GB2424802B (en) * 2005-03-30 2007-05-09 Nec Corp Transport resource control system and method, and radio network controller and program used in the same
CN101232627B (zh) * 2007-01-26 2012-01-11 中兴通讯股份有限公司 一种保证接入终端和接入网络的资源预留信息一致的方法
CN102638842A (zh) * 2012-04-11 2012-08-15 深圳市中兴移动通信有限公司 一种移动终端网络流量显示及预警方法
CN102638842B (zh) * 2012-04-11 2015-01-07 深圳市中兴移动通信有限公司 一种移动终端网络流量显示及预警方法

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