WO2007079772A1 - Établissement de canal gprs/egprs au moyen de paramètres de flux de blocs temporaires stockes dans une station mobile - Google Patents

Établissement de canal gprs/egprs au moyen de paramètres de flux de blocs temporaires stockes dans une station mobile Download PDF

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Publication number
WO2007079772A1
WO2007079772A1 PCT/EP2006/000102 EP2006000102W WO2007079772A1 WO 2007079772 A1 WO2007079772 A1 WO 2007079772A1 EP 2006000102 W EP2006000102 W EP 2006000102W WO 2007079772 A1 WO2007079772 A1 WO 2007079772A1
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WO
WIPO (PCT)
Prior art keywords
mobile station
physical channel
temporary physical
network
uplink
Prior art date
Application number
PCT/EP2006/000102
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English (en)
Inventor
David Cooper
Mungal Dhanda
Original Assignee
Matsushita Electric Industrial Co. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co. Ltd. filed Critical Matsushita Electric Industrial Co. Ltd.
Priority to PCT/EP2006/000102 priority Critical patent/WO2007079772A1/fr
Publication of WO2007079772A1 publication Critical patent/WO2007079772A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the invention generally relates to mobile communications and in particular to increasing a peak data rate at the air interface of GPRS/EGPRS.
  • the invention concerns a method in a packet-switched mobile communications system for establishing an uplink temporary physical channel between a mobile station and a network without adding further to the signaling load.
  • This invention proposes a method for reducing the signalling overhead when assigning uplink resources, thereby improving downlink data transfer rate.
  • GPRS General Packet Radio Service
  • GSM Global System for Mobile communications
  • New GPRS handsets are able to transfer data at rates much higher than the 9.6 or 14.4 kbps available to GSM mobile phone users.
  • GPRS could support rates to 171.2 kbps, surpassing ISDN (Integrated Services Digital Network) access rates.
  • ISDN Integrated Services Digital Network
  • GPRS General packet radio service
  • the GPRS service uses the existing GSM network and adds new packet-switching network equipment.
  • GPRS General Packet Radio Service
  • RLC Radio Link Control
  • the RLC segmentation function is a process of taking one or more LLC-PDUs and dividing them into smaller RLC blocks.
  • the LLC-PDUs are known collectively as a Temporary Block Flow (TBF) and are allocated the resources of one or more Packet Data CHannels (PDCH).
  • TBF Temporary Block Flow
  • PDCH Packet Data CHannels
  • TBF is temporary and is maintained only for the duration of the data transfer.
  • Each TBF is assigned a Temporary Flow Identity (TFI) by the network.
  • the RLC data blocks consist of an RLC header, an RLC data unit, and spare bits.
  • the RLC data block along with a MAC header may be encoded using one of four defined coding schemes.
  • the coding scheme is critical in deciding the segmentation process.
  • MAC controls the access signalling across the air interface, including the management of shared transmission resources (assignment of the radio block to multiple users on the same timeslot). MAC achieves these functionalities by placing a header in front of the RLC header in the RLC/MAC data and control blocks.
  • the MAC header contains several elements, some of which are direction-specific, referring to the downlink or uplink.
  • the key parameters of MAC header are:
  • Uplink Status Flag (USF), which is sent in all downlink RLC/MAC blocks and indicates the owner or use of the next uplink radio block on the same timeslot;
  • RRBP Relative Reserved Block Period
  • Payload Type which specifies the type of data (control block or data block) contained in the remainder of the RLC/MAC block
  • the data is sent over the physical layer connection between the SGSN (Serving GPRS Support Node) and BSS.
  • the BSSGP Base Station System GPRS Protocol
  • the most important job of the RLC layer is segmentation of LLC blocks into smaller RLC blocks.
  • a group of LLC blocks, which has been segmented into smaller blocks, is known as a TBF.
  • Each TBF is allocated resources on the air interface on one or more Packet Data Traffic CHannels (PDTCH).
  • PDTCH Packet Data Traffic CHannels
  • the TBF is temporary and maintained only for the duration of the data transfer.
  • the TBF is assigned a TFI (temporary flow identity), and the RLC layer adds a header to the data blocks containing the TFI, RLC block sequence number, last block indication, TLLI (Temporary Logical Link Identity), and other information.
  • the RLC header includes direction (downlink/uplink) information as well.
  • the LLC data block segment size will depend on the coding scheme used on the air interface.
  • CS1 There are four coding schemes defined for GPRS: CS1 , CS2, CS3, and CS4, which contain maximum data of 22, 32, 38, and 52 octets correspondingly.
  • the selection of coding scheme depends upon trade-off between desired throughput and reliability.
  • the RLC blocks are transmitted over the air interface. It is noted that there is one more layer before the physical radio interface —the MAC. This layer controls the access signalling, including assignment of uplink and downlink blocks. It adds its own header, which is monitored by the mobile phones.
  • the data is transmitted over the air interface to the Mobile Station (MS) via the physical layer.
  • MS Mobile Station
  • the data then moves up the MS protocol stack where the headers are stripped off at each successive layer.
  • the original (e.g. e- mail) message is received at the application layer by the mobile user.
  • TBF temporary block flow
  • the RLC layer takes one or more LLC blocks and segments them into smaller RLC blocks. These LLC blocks together are known as a TBF (temporary block flow).
  • a TBF is a physical connection used by the two radio resource entities to support the unidirectional transfer of LLC PDUs on packet data physical channels. All of the LLC frames that have been segmented for one NPDU (Network Packet Data Unit) form one TBF on the logical link on the air interface. Each TBF is allocated resources on the air interface on one or more PDTCH. The TBF is temporary and is maintained only for the duration of the data transfer. The TBF is "open" during the data transfer and "closed” when the transfer is discontinued.
  • RLC data blocks are transferred using a process called acknowledged RLC/MAC mode. This process is controlled by a selective ARQ (Automatic Repeat Request) mechanism and by the numbering of the RLC data blocks within a temporary block flow.
  • the uplink data transfer is described first.
  • the sending side either the Mobile Station or the network, transmits blocks within a window, and the receiving side sends a packet uplink ack/nack (acknowledged/ not acknowledged) or packet downlink ack/nack message as needed. Every such message acknowledges all correctly received RLC data blocks up to an indicated Block Sequence Number (BSN), thus "moving" the beginning of the sending window on the sending side.
  • BSN Block Sequence Number
  • the message also provides the starting absolute BSN value for the bit map. For example, if RLC data blocks with BSN numbers 21 through 26 have been sent by the mobile and blocks 24 and 25 are corrupted, when the network sends the ack/nack message, it will indicate which blocks were received and which were not.
  • the bit map will appear as "111001 ,” beginning with a "1" acknowledging BSN 21 and including a "0" each for BSNs 24 and 25.
  • the ack/nack message can be sent in any of the assigned blocks, and the RLC/MAC header will indicate that this is a control message.
  • a mobile has a transmit window of only 64 blocks, and if it doesn't receive an ack/nack message within this window, it will notify the network in the next available block that the window is stalled.
  • the mobile also sends a "countdown value" (of 0 - 15) in the uplink RLC data block header to inform the network how many RLC data blocks remain in the current uplink TBF. Once the countdown value reaches 0, the network can send the final ack/nack message.
  • the mobile After the mobile sends the last data block with a countdown value of 0, it starts a timer. When the timer expires after 5 seconds, the mobile considers the current assignment of resources invalid.
  • the network initiates transmission of a packet to a mobile in the ready state using a packet downlink assignment message. If an uplink packet transfer is already in progress, the packet downlink assignment message can be transmitted on a PACCH. Otherwise, it can be sent on a PCCCH or a CCCH.
  • the packet downlink assignment message conveys information to the mobile about the timeslots, the frequency parameters, timing advance, power control, TFI, and starting TDMA frame number.
  • the network sends the RLC/MAC blocks belonging to a TBF on the assigned downlink channels. Generally more than one mobile station is multiplexed on the PDCHs at any given time, and each mobile station needs a way to identify its own TBF. This is done with the TFI in the RLC header.
  • the TFI is a unique identity associated with a TBF in one direction on one set of PDCHs.
  • the MAC header identifies the RLC block as a control/data block, and the TFI in the RLC header identifies the mobile to which the block belongs.
  • the MAC header in the downlink RLC blocks contains a bit for polling the mobile. It uses an information field such as RRBP to inform the mobile of the relative frame number (and thus the radio block) after which the mobile has to send the packet downlink ack/nack message. There is also a Final Block Indicator (FBI) bit in the downlink RLC header that flags the final RLC data block and initiates the release of resources process.
  • FBI Final Block Indicator
  • the network can change a current downlink assignment by using a packet downlink assignment message or a packet timeslot reconfigure message, which in turn has to be acknowledged by the mobile in a reserved radio block on the uplink.
  • steps 3 and 4 may be repeated a number of times depending on the amount of data the mobile station has to transmit. Once the uplink TBF is released, the mobile station and network have to repeat steps 1 , 2, 3 and 4 to establish a new uplink TBF and transfer uplink data.
  • While the request for new resources from the mobile station is generally carried within a downlink ack/nack (Acknowledged/Not Acknowledged) message, the request does not consume uplink resources, but the assignment from the network consumes one radio block's worth of resources and this radio block is not shared for any other information.
  • ack/nack Acknowledged/Not Acknowledged
  • each radio block can carry two RLC (Radio Link Control) data blocks using MCS 9 and each RLC data block is up to 74 octets - of user data to the mobile station.
  • RLC Radio Link Control
  • the object of the invention is to reduce the number of times an uplink assignment message needs to be sent to a mobile station, hence increasing capability for sending downlink data.
  • the present invention provides a method, system, apparatus and computer-readable medium for establishing an uplink temporary physical channel between a mobile station and a network in a packet-switched mobile communications system.
  • the mobile station requests to assign an uplink temporary physical channel, which is assigned to it by the network.
  • the Mobile station stores parameters of the uplink temporary physical channel used and transmits data to the network using the assigned uplink temporary physical channel with the stored parameters of a previously used uplink temporary physical channel.
  • the method further comprises the step of the mobile station releasing the uplink temporary physical channel.
  • the network acknowledges data after the mobile station has transmitted it.
  • parameters include at least one of frequency, timeslots, temporary flow identity, timing advance and uplink state flag.
  • the packet-switched mobile communication system is operated as a GPRS or EGPRS system.
  • the uplink temporary physical channel is a temporary block flow used by the mobile station and the network to support unidirectional transfer of upper layer information.
  • a further embodiment of the invention relates to the network signalling to the mobile station to use the uplink temporary physical channel with the parameters stored in the mobile station.
  • a further advantageous embodiment of the invention has bit sequences used to signal to the mobile station being a supplementary polling bit or EGPRS supplementary polling bits.
  • the supplementary polling bit or EGPRS supplementary polling bits are set to 1 O'.
  • bit sequences used to assign a temporary physical channel to the mobile station are relative reserved block period bits.
  • the relative reserved block period bits are set to indicate that the most recently, the second most recently or the third most recently stored parameters are used.
  • the mobile station deletes the stored uplink temporary physical channel parameters upon returning to idle state.
  • a method in a packet-switched mobile communications system for establishing a downlink temporary physical channel between a network and a mobile station is used.
  • the network requires a downlink temporary physical channel, which it assigns to the mobile station.
  • the mobile station stores parameters of the downlink temporary physical channel used and the network transmits data to the mobile station using the assigned downlink temporary physical channel with the stored parameters of a previously used downlink temporary physical channel.
  • Figure 1 shows a generic uplink resource assignment procedure
  • Figure 2 illustrates a GPRS MAC Header
  • Figure 3 shows an EGPRS MAC Header
  • Figure 4 shows an optimised uplink resource assignment procedure
  • Figure 5 is a flow chart for downlink TBF assignment with and without stored parameters.
  • Figure 6 is a flow chart for uplink TBF assignment with and without stored parameters.
  • All downlink RLC/MAC (Medium Access Control) blocks contain a two bit field called the Relative Reserved Block Period (RRBP), as shown in Figure 2 and Figure 3.
  • the RRBP field is only valid if S/P (Supplementary/Polling) bit is not set to 0 within the GPRS MAC header or the ES/P (EGPRS S/P) bit is not set to 00 within the EGPRS MAC header [3GPP TS 44.060 V6.15.0 (2005-11), GPRS: MS - BSS interface, RLC/MAC protocol (Release 6), p. 170 - 171].
  • RRBP RRBP and S/P bit sequences that are not used as shown in Table 1.
  • EGPRS there are four combinations of RRBP and ES/P bit sequences that are not used as shown in Table 2.
  • the RRBP field is used to indicate the amount of time the mobile station has to respond to a poll request. If the mobile station is not polled then the RRBP field is ignored by the mobile station.
  • bit patterns not used in the case of GPRS and EGPRS see Table 1 and Table 2.
  • One or more of these bit patterns could be used by the network to signal other information to the mobile station.
  • the invention is that when a mobile station is assigned uplink TBF resources, it is instructed to save a record of the TBF parameters describing the assignment of these resources when the uplink TBF is released and a downlink TBF is active.
  • the new procedure for assigning uplink TBF resources is shown in Figure 4.
  • the mobile station is instructed to store the uplink TBF parameters before the TBF is released.
  • the mobile station requires an uplink TBF after some time and sends a request to the network.
  • the network this time sends a downlink radio block containing other information, such as a downlink RLC data block, and sets the S/P and RRBP bits in such a way that it instructs the mobile station to use the stored uplink TBF parameters.
  • the mobile station then activates the uplink TBF and transfers data as normal.
  • Figure 6 is a flow chart of the method described above.
  • the method starts with step 600, and then in step 610 the mobile station requests an uplink TBF of the network.
  • the network instructs the mobile station to use the stored uplink TBF parameters in step 630, or the network assigns an uplink TBF to the mobile station in step 640 and then the mobile station stores the uplink TBF parameters in step 650.
  • step 660 the mobile station transmits the uplink data to the network, which acknowledges this in step 670. If all TBFs are to be released in step 680 the mobile station clears all stored TBF parameters in step 690 and then returns to the beginning. Otherwise the method starts from the beginning in step 600 again.
  • FIG. 5 is a flow chart describing this method. It starts with step 500 and then in step 510 the network requires the downlink TBF. If the mobile station has stored TBF parameters in step 520, the network instructs the mobile station to use the stored downlink TBF in step 530. If, however, the mobile station has not got any downlink TBF parameters stored in step 520, the network assigns a downlink TBF to the mobile station in step 540. The mobile station then stores the downlink TBF parameters in step 550.
  • the network After the instruction to use the stored downlink TBF or assignment of a downlink TBF the network transmits the downlink data in step 560, which the mobile station acknowledges in step 570. If it is decided in step 580 that all TBFs are to be released, the mobile station clears all stored TBF parameters in step 590 and the method returns to the beginning, otherwise the method restarts with the TBF parameters in the storage section of the mobile station.
  • Another embodiment of the invention relates to the implementation of the above described various embodiments using hardware and software. It is recognized that the various above mentioned methods as well as the various modules described above may be implemented or performed using computing devices (processors), as for example general purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, etc. The various embodiments of the invention may also be performed or embodied by a combination of these devices.
  • processors processors
  • DSP digital signal processors
  • ASIC application specific integrated circuits
  • FPGA field programmable gate arrays
  • the various embodiments of the invention may also be performed or embodied by a combination of these devices.
  • the various embodiments of the invention may also be implemented by means of software modules which are executed by a processor or directly in hardware. Also a combination of software modules and a hardware implementation may be possible.
  • the software modules may be stored on any kind of computer readable storage media, for example RAM, EPROM, EEPROM, flash memory, registers, hard disks, CD-ROM, DVD, etc.

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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 dans un système de communications mobiles par commutation de paquets pour l'établissement d'un canal physique temporaire de liaison montante entre une station mobile et un réseau. Le procédé comprend les étapes suivantes: la demande par la station mobile d'une allocation d'un canal physique temporaire de liaison montante; l'allocation de celui-ci par le réseau; le stockage par la station mobile des paramètres du canal physique temporaire de liaison montante utilisés et la transmission de données au moyen du canal physique temporaire de liaison montante alloué avec les paramètre stockés du canal physique temporaire de liaison montante utilisés précédemment. L'invention concerne également un procédé dans un système de communications mobiles par commutation de paquets pour l'établissement d'un canal physique temporaire de liaison descendante entre un réseau et une station mobile au moyen d'un canal physique temporaire de liaison descendante avec des paramètres stockés d'un canal physique temporaire de liaison descendante précédemment utilisé.
PCT/EP2006/000102 2006-01-09 2006-01-09 Établissement de canal gprs/egprs au moyen de paramètres de flux de blocs temporaires stockes dans une station mobile WO2007079772A1 (fr)

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PCT/EP2006/000102 WO2007079772A1 (fr) 2006-01-09 2006-01-09 Établissement de canal gprs/egprs au moyen de paramètres de flux de blocs temporaires stockes dans une station mobile

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PCT/EP2006/000102 WO2007079772A1 (fr) 2006-01-09 2006-01-09 Établissement de canal gprs/egprs au moyen de paramètres de flux de blocs temporaires stockes dans une station mobile

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011107032A1 (fr) * 2010-03-04 2011-09-09 华为技术有限公司 Procédé et appareil permettant d'établir un flux de blocs temporaire (tbf)

Citations (5)

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Publication number Priority date Publication date Assignee Title
US5428823A (en) * 1992-05-04 1995-06-27 Motorola, Inc. Method for a communication unit to access and utilize information from an allocator
US20030008657A1 (en) * 2001-05-15 2003-01-09 Eric Rosen Method and apparatus for a voiding simultaneous service origination and paging in a group communication network
EP1326454A1 (fr) * 2002-01-08 2003-07-09 Motorola, Inc. Procédés pour l'allocation dynamique en transmission descendante dans des systèmes de communication mobile
US20040090948A1 (en) * 2000-12-20 2004-05-13 Mika Forssell Method in a communications system for assigning transmission resources
US20050068963A1 (en) * 2003-09-29 2005-03-31 Lg Electronics Inc. Method and apparatus for establishing radio bearer for point-to-multipoint multimedia service in mobile communication system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428823A (en) * 1992-05-04 1995-06-27 Motorola, Inc. Method for a communication unit to access and utilize information from an allocator
US20040090948A1 (en) * 2000-12-20 2004-05-13 Mika Forssell Method in a communications system for assigning transmission resources
US20030008657A1 (en) * 2001-05-15 2003-01-09 Eric Rosen Method and apparatus for a voiding simultaneous service origination and paging in a group communication network
EP1326454A1 (fr) * 2002-01-08 2003-07-09 Motorola, Inc. Procédés pour l'allocation dynamique en transmission descendante dans des systèmes de communication mobile
US20050068963A1 (en) * 2003-09-29 2005-03-31 Lg Electronics Inc. Method and apparatus for establishing radio bearer for point-to-multipoint multimedia service in mobile communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011107032A1 (fr) * 2010-03-04 2011-09-09 华为技术有限公司 Procédé et appareil permettant d'établir un flux de blocs temporaire (tbf)

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