WO2001018996A1 - Procede de transmission par paquets - Google Patents

Procede de transmission par paquets Download PDF

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Publication number
WO2001018996A1
WO2001018996A1 PCT/US2000/024826 US0024826W WO0118996A1 WO 2001018996 A1 WO2001018996 A1 WO 2001018996A1 US 0024826 W US0024826 W US 0024826W WO 0118996 A1 WO0118996 A1 WO 0118996A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
header
frame
mobile station
bit pattern
Prior art date
Application number
PCT/US2000/024826
Other languages
English (en)
Inventor
Gino Anthony Scribano
Robert T. Love
Original Assignee
Motorola Inc.
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 Motorola Inc. filed Critical Motorola Inc.
Priority to BR0013572-0A priority Critical patent/BR0013572A/pt
Priority to AU71296/00A priority patent/AU7129600A/en
Priority to JP2001522697A priority patent/JP4659318B2/ja
Publication of WO2001018996A1 publication Critical patent/WO2001018996A1/fr

Links

Classifications

    • 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
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • 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
    • H04L47/43—Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • 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
    • H04W88/12—Access point controller devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers
    • 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
    • H04L69/22—Parsing or analysis of headers
    • 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
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection

Definitions

  • the present invention pertains to packet transmission, and more particularly to packet transmission between cellular base transceiver stations and network switches.
  • the loading may include data, control messages, or other information relating to mobile station or base transceiver station operation.
  • the data payload portion of the packet or frame may comprise fill bits. The RNC ignores these fill bits.
  • Backhaul loading can limit the overall system capacity. In many situations, backhaul loading is not a problem. However, as data demands rise, and capacity reaches its limits in existing systems, backhaul loading can limit system capacity. Accordingly, what is needed is a method of reducing loading without negatively impacting on communications.
  • FIG. 1 is block diagram illustrating a cellular communication system.
  • FIG. 2 illustrates a frame or packet communicated between the base transceiver stations and the network in the communication system according to FIG. 1.
  • DETAILED DESCRIPTION OF THE DRAWINGS A wireless system includes base station transceivers to communicate with at least one mobile station, the base station transceivers communicate with a network controller. The base station controls a header for a packet frame to be communicated between the base station transceiver and the network controller wherein a portion of the header identifies the frame as one containing no data package.
  • the data bits of the header field may contain a predetermined bit pattern for a frame including no data package.
  • Information received by the base station from the mobile station may be dropped, and the header information replaced with the specified bit pattern, if a decoding metric passes a threshold.
  • the information received by the base station from the mobile station may be dropped, and the header information replaced with the specified bit pattern, if a CRC for the frame received from the mobile station fails.
  • a cellular system 100 is disclosed in FIG. 1.
  • the illustrated cellular system 100 is a code division multiple access system including a plurality of base transceiver stations (BTS) 102-104 in communication with a mobile station MS 108 that communicate over respective wireless communication paths.
  • BTS base transceiver stations
  • the base transmission stations 102-103 are connected to a mobile switching system network 110.
  • the infrastructure responsible for controlling, coordinating, and initializing base transceiver stations, is commonly known as the central base station controller (CBSC), or radio network controller (RNC), or the selection/distribution unit (SDU).
  • CBSC central base station controller
  • RNC radio network controller
  • SDU selection/distribution unit
  • Digital cellular systems of this type are well known.
  • backhaul communications are made between the BTS and network controller both for system control and outgoing communications.
  • a bit or unassigned bit pattern is added to a header in the packet 200 (FIG. 2).
  • an existing bit field in the header for communications between the base transceiver station and the network controller to indicate that the data payload is empty.
  • SER signal error rate
  • Reverse Link Information This field is used to indicate signal quality. If a payload is not present, the field can be advantageously employed to transmit a predetermined bit pattern (or one bit of the octet can be a flag) indicating that a payload is not present.
  • the BTSs 102-104 insert the predetermined bit, or pattern, into the selected field when transmitting a signal to the RNC 110.
  • the RNC checks to see if the predetermined pattern, or flag bit, in the header indicate whether "Reverse Link Information", referred to herein as payload is present. If the payload is present, it is processed in the ordinary manner. If a payload is not present, the frame is processed in the same manner as if the payload was all fill bits.
  • CRC cyclic redundancy check
  • a bit pattern of the frame type bit field of the packet header can be selected to indicate that a payload is not attached. Alternately a new field can be used in the packet header.
  • the invention can be advantageously employed to more efficiently use the reverse backhaul bandwidth by not passing up filler data for frame intervals when none of the fingers allocated by a BTS to a given user are in lock.
  • An example of where fill data is transmitted in existing systems is when none of the channel demodulator's (fingers) corresponding to a given mobile station (or end user equipment) communication link are in "lock", which can happen to the weaker serving leg during soft handoff to a stronger serving leg.
  • Normal operation at the base transceiver station (BTS) of a code division multiple access (CDMA) cellular system requires assigning fingers to the signal paths received at a serving base station in communication with a mobile station.
  • BTS base transceiver station
  • CDMA code division multiple access
  • Finger assignment is determined by a set of finger management rules applied to active (active meaning that fingers (demodulators) are currently assigned to the offset)_pseudo noise (PN) offsets and potential PN offset candidates after each search time interval.
  • PN offset candidates are determined by the searcher when the energy of a given signal path exceeds some search threshold.
  • Active PN offsets have fingers assigned to them and are demodulated followed by soft combining and decoding. When a finger's energy assigned to an active PN offset goes below a "lock" threshold, the finger is deassigned such that no demodulation takes place for that finger and it no longer is used in diversity combining. The deassigned finger can then be assigned to a more promising PN candidate if one exists. If the searcher does not detect any PN offsets with sufficient energy to report to the finger manager and the existing active active
  • backhaul bandwidth refers to the required communications bandwidth between base transceiver stations and the infrastructure responsible for controlling, coordinating, and initializing base transceiver stations typically known as the CBSC, or RNC, or SDU). Therefore, inter-carrier soft handoff is provided herein which provides an indication for the situation where a header is returned to the RNC alone without a data payload. This concept can be extended to the case when frames are erased
  • the decision on whether to send a payload or an erased frame can be made a soft decision by using a threshold based on symbol error rate (SER), or some similar frame quality metric, as some erased frames still have useful information and the corresponding payload is needed at the RNC.
  • SER symbol error rate
  • Examples of quality frame metrics that can be used for the decision of whether to transmit the data include a total metric or a bit energy metric (BER) such as the estimated signal to interference ratio (SIR), signal to noise ratio (SNR) or Eb/Nt, or the like.
  • a system for assigning a new bit or using an unallocated bit pattern of an existing field in the packet header to indicate the absence of the data payload portion of the packet. This allows a reduction of the average backhaul bandwidth. This is particularly advantageous when none of the user allocated fingers are in lock at a given service base transceiver station (BTS), but can also be extended for erased frames with high SER at the discretion of the carrier/operator.
  • BTS service base transceiver station

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un système sans fil qui comprend des émetteurs-récepteurs de station de base (102-104) associés à un contrôleur de réseau (110) pour communiquer avec au moins une station mobile (108). La station de base contrôle une en-tête de trame de paquets devant être transmise entre l'émetteur-récepteur de la station de base et le contrôleur de réseau, une partie de l'en-tête identifiant la trame comme étant dépourvue de paquets de données. Les bits d'information du champ d'en-tête peuvent contenir une configuration binaire destinée à une trame dépourvue de paquets de données. L'information reçue par la station de base de la station mobile peut être abandonnée et l'information d'en-tête remplacée par la configuration binaire spécifiée lorsqu'une métrique de décodage a dépassé un seuil donné. L'information reçue par la station de base de la station mobile peut être abandonnée et l'information d'en-tête remplacée par la configuration binaire spécifiée lorsqu'un CRC pour la trame reçue de la station mobile a échoué.
PCT/US2000/024826 1999-09-08 2000-09-08 Procede de transmission par paquets WO2001018996A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR0013572-0A BR0013572A (pt) 1999-09-08 2000-09-08 Método de transmissão de pacote
AU71296/00A AU7129600A (en) 1999-09-08 2000-09-08 Packet transmission method
JP2001522697A JP4659318B2 (ja) 1999-09-08 2000-09-08 パケット伝送方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15274199P 1999-09-08 1999-09-08
US60/152,741 1999-09-08

Publications (1)

Publication Number Publication Date
WO2001018996A1 true WO2001018996A1 (fr) 2001-03-15

Family

ID=22544220

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2000/024707 WO2001018991A1 (fr) 1999-09-08 2000-09-08 Selection de liaison dans un systeme de communications
PCT/US2000/024826 WO2001018996A1 (fr) 1999-09-08 2000-09-08 Procede de transmission par paquets

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2000/024707 WO2001018991A1 (fr) 1999-09-08 2000-09-08 Selection de liaison dans un systeme de communications

Country Status (6)

Country Link
JP (2) JP4659318B2 (fr)
KR (2) KR20020030807A (fr)
CN (2) CN1274160C (fr)
AU (2) AU7983100A (fr)
BR (2) BR0013604B1 (fr)
WO (2) WO2001018991A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007063446A3 (fr) * 2005-12-01 2007-10-25 Ericsson Telefon Ab L M Suppression de trames effacees et de trames inactives dans un systeme de communication sans fil
US8289899B2 (en) 2008-02-18 2012-10-16 Fujitsu Limited Communication method and intermediate network device with branch selection functions
CN106533531A (zh) * 2016-10-14 2017-03-22 上海微小卫星工程中心 人造卫星通信机

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KR20020094920A (ko) * 2001-06-13 2002-12-18 가부시키가이샤 엔티티 도코모 이동체 통신 시스템, 이동체 통신 방법, 기지국, 이동국및 이동체 통신 시스템에 있어서의 신호 송신 방법
FR2827098B1 (fr) 2001-07-05 2003-12-05 Nortel Networks Ltd Procede de controle de ressources radio affectees a une communication entre un terminal mobile et une infrastructure cellulaire a etalement de spectre, et equipements pour la mise en oeuvre du procede
CA2453619A1 (fr) * 2001-07-05 2003-01-16 Nortel Networks Limited Procede de controle de ressources radio affectees a une communication entre un terminal mobile et une infrastructure cellulaire a etalement de spectre et equipements pour la mise en oeuvre du procede
US7190673B2 (en) 2002-06-26 2007-03-13 Interdigital Technology Corporation Method and system that improves interoperability of a radio network controller and a base station in cellular system with downlink congestion control
US8400979B2 (en) * 2003-01-07 2013-03-19 Qualcomm Incorporated Forward link handoff for wireless communication systems with OFDM forward link and CDMA reverse link
EP1659807A1 (fr) * 2003-08-29 2006-05-24 Mitsubishi Denki Kabushiki Kaisha Station mobile et systeme de communications
EP1566896A1 (fr) * 2004-02-18 2005-08-24 Siemens Aktiengesellschaft Procédé de communication utilisant une pluralité d'antennes émettrices de réseau
CN1998258A (zh) * 2004-08-05 2007-07-11 三菱电机株式会社 基站和移动通信终端装置以及主小区选择方法
US7565110B2 (en) * 2004-09-17 2009-07-21 Alcatel-Lucent Usa Inc. Method for determining rise over thermal for a reverse link in a wireless system
US7889692B2 (en) * 2004-09-30 2011-02-15 Alcatel-Lucent Usa, Inc. Packet error rate estimation in a communication system

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US5615210A (en) * 1994-01-11 1997-03-25 Ntt Mobile Communications Network Inc. Mobile radio communications system
US5469471A (en) * 1994-02-01 1995-11-21 Qualcomm Incorporated Method and apparatus for providing a communication link quality indication
US6049535A (en) * 1996-06-27 2000-04-11 Interdigital Technology Corporation Code division multiple access (CDMA) communication system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007063446A3 (fr) * 2005-12-01 2007-10-25 Ericsson Telefon Ab L M Suppression de trames effacees et de trames inactives dans un systeme de communication sans fil
US7376102B2 (en) 2005-12-01 2008-05-20 Telefonaktiebolaget Lm Ericsson (Publ) Erased frame and idle frame suppression in a wireless communications system
US8289899B2 (en) 2008-02-18 2012-10-16 Fujitsu Limited Communication method and intermediate network device with branch selection functions
CN106533531A (zh) * 2016-10-14 2017-03-22 上海微小卫星工程中心 人造卫星通信机

Also Published As

Publication number Publication date
AU7983100A (en) 2001-04-10
BR0013604B1 (pt) 2013-12-03
JP4695803B2 (ja) 2011-06-08
KR20020029785A (ko) 2002-04-19
AU7129600A (en) 2001-04-10
JP4659318B2 (ja) 2011-03-30
CN1158788C (zh) 2004-07-21
WO2001018991A1 (fr) 2001-03-15
JP2003510862A (ja) 2003-03-18
CN1373943A (zh) 2002-10-09
KR20020030807A (ko) 2002-04-25
BR0013604A (pt) 2002-11-26
BR0013572A (pt) 2002-04-30
CN1385005A (zh) 2002-12-11
JP2003509895A (ja) 2003-03-11
CN1274160C (zh) 2006-09-06
KR100464470B1 (ko) 2005-01-03

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