EP1665842A2 - Procede de transmission de messages, station mobile, station de base et systeme de communications - Google Patents

Procede de transmission de messages, station mobile, station de base et systeme de communications

Info

Publication number
EP1665842A2
EP1665842A2 EP04787214A EP04787214A EP1665842A2 EP 1665842 A2 EP1665842 A2 EP 1665842A2 EP 04787214 A EP04787214 A EP 04787214A EP 04787214 A EP04787214 A EP 04787214A EP 1665842 A2 EP1665842 A2 EP 1665842A2
Authority
EP
European Patent Office
Prior art keywords
message
messages
base station
code
transmitted
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04787214A
Other languages
German (de)
English (en)
Inventor
Hrvoje Jenkac
Günther LIEBL
Thomas Stockhammer
Wen Xu
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.)
BenQ Corp
Original Assignee
BenQ Mobile GmbH and Co OHG
BenQ Corp
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 BenQ Mobile GmbH and Co OHG, BenQ Corp filed Critical BenQ Mobile GmbH and Co OHG
Priority to EP04787214A priority Critical patent/EP1665842A2/fr
Publication of EP1665842A2 publication Critical patent/EP1665842A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1692—Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • the invention relates to a method for transmitting messages, a mobile station, a base station and a communications system.
  • P-t-P Point-to-Point
  • MBMS services are transmitted in a broadcast or multicast mode to several users simultaneously over a common downlink channel using a Point- o-Multipoint (P-t-M) connection.
  • P-t-M Point- o-Multipoint
  • Each terminal receives data transmitted on the same frequency and in the same time slot in the downlink.
  • Using common downlink resources to distribute identical content to several users increases the system efficiency enormous the more receiving terminals are using the service simultaneously, in contrast to separate P-t-P connection.
  • P-t-M Point- o-Multipoint
  • FEC Forward Error Correction
  • an acknowledged mode MBMS bearer comparable to the acknowledged mode in GPRS P-t-P transmission should be introduced [2], as only feedback and retransmission strategies can provide sufficient reliability.
  • the goal is to exploit feedback information from the terminals to the BS and to reduce the residual error rate for the background services or at least to adapt somehow to the receiving conditions to the users in the cell.
  • P-t-P retransmissions are not very efficient as packets with identical sequence numbers are retransmitted multiple times . Especially for scenarios with many users, e.g. in a football stadium, this transmission strategy turns out to be inefficient or even infeasible.
  • a channel use as the transmission of one RLC/MAC radio block using one frequency, which results in the occupation of four radio bursts.
  • the basic idea of P-t-M retransmissions is these packets are also transmitted over a common physical channel (all terminals listen to the same frequency and time slot) .
  • P-t-M retransmission scenario in contrast to the P-t-P scenario is that the retrans- missions can be performed immediately after an unsuccessful packet transmission, as the transmission bearer for transmission and retransmission is identical. This reduces the memory requirement in the receiver, as sequence numbers of packets do not have to be stored until the end of the file transmis- sion.
  • the transmitter may control the feedback transmission by polling selected users.
  • polling the number of users that have to be identified in the system and appropriate polling policies have to be applied. More details on feedback in broadcast systems are discussed in Section 3.
  • This feedback channel could be considered as a P-t-P feedback channel, which carries feedback messages from a single receiver to the sender, or a shared channel where dedicated resources for a single receiver might be available on a TDM or CDM basis. Moreover, in the general case it is supposed that the feedback channel is able to carry not only the ACK and NAK messages, but also additional information which specifies the sequence number and/or the terminal the feedback message belongs.
  • All terminals use the same resources such as frequency, time slot, and/or code (e.g. in a CDMA system) in the uplink to inform the BS about the lost packet and send NAKs simultaneously.
  • resources such as frequency, time slot, and/or code (e.g. in a CDMA system) in the uplink to inform the BS about the lost packet and send NAKs simultaneously.
  • the BS it is in general not of interest which terminals lost the corresponding packet, especially if a retransmission for each lost message has to be performed anyways in the p-t-m system.
  • feedbacks are sent by all mobile terminals as uplink bursts on the CUFCH within explicitly assigned resources, where the assignment of re- sources depends on the sequence number of the corresponding downlink message. If a mobile terminal does not receive a downlink message, it will send an uplink burst within the corresponding uplink resources. Otherwise, nothing is transmitted.
  • the BS listens if some power or energy is received in a certain timeslot. If the received power or energy exceeds a certain threshold, it is assumed that there are users in the serving area, who request a retransmission of some recent information. If the power is below a certain threshold, it is assumed that the message has been received correctly by all or most users.
  • Sending one NAK message for each downlink message is still extremely costly in terms of radio resources, especially in systems such as GERAN, where the mobile terminals usually operate in simplex mode, i.e. they are not capable to transmit and receive messages at the same time. Even worse, most of the time some guard interval has to be accepted for switching between sending period and receiving period.
  • the timing and frequency of these feedback messages on the uplink with respect to the transmitted code word sequence on the downlink depends on the number of messages in the set of messages. In addition, it can be dependent on the application requirement of the actual MBMS service.
  • a specific realization for the organization of downlink and uplink messages would be to have an arrangement whereby in the frames where the mobile terminal can transmit a NAK, no MBMS data is transmitted in the downlink.
  • a specific realization for the uplink burst would be use only part of a complete radio access burst. For example the middle part, a random part for each user, or any other part of the complete uplink burst might be used to send an uplink mes- sage .
  • the redundancy part can be a redundancy symbol of a Reed-Solomon code word, a part of incremental redundancy for RCPC codes, or any other redundancy symbol obtained from puncturing a channel code. The position of information and redundancy parts has to be signalled.
  • the signalling can either be done implicitly by using some transmission order, external sequence number, etc., or explicitly by indicating the position explicitly in the packet header.
  • the sequence number of the code word to which this information or redundancy portion is assigned to has to be signalled. This can also be done implicitly by applying some transmission order or explicitly by specifying the sequence number of the code word.
  • the introduction of an uplink channel allows to introduce reliable data services in p-t-m scenarios such MBMS over GERAN
  • the introduction of a common uplink channel allows to send feedback messages even in case of a high number of participating users.
  • the combination of the common uplink channel with incremental redundancy allows to increase the efficiency in the system significantly, as the system can provide reliable services and the throughput of the system is al- most identical to the throughput in p-t-p transmission of the worst supported user.
  • the uplink messages can be used as an add-on, as the back channel messages can basically be ignored, if the reliability of the service is not guaranteed.
  • the feedback information can be used to get a basic idea on the user topology in the serving area.
  • the channel coding rate and the throughput can be adjusted appropriately .
  • Figure 1 shows P-t-M packet transmission to multiple users
  • Figure 2 shows Retransmission of lost packets to individual terminals using a P-t-P connection
  • Figure 3 shows P-t-M retransmission of lost data packets using a common physical channel
  • Figure 4 shows P-t-M retransmissions exploiting incremental redundancy
  • Figure 5 shows Principle idea: Incremental redundancy in broadcast systems.
  • message 1, message 2, and message 3 form a set of messages.
  • the broadcasting of all messages to user 1 and user 2 yields in the successful transmission of message 1 to both users, the successful transmission of message 2 to user 2 and the successful transmission of message 3 to user 1.
  • the transmission of message 3 to user 1 as well as the transmission of message 3 to user 2 ails.
  • user 1 would send a NAK for message 3 and request immediate retransmission of the same message. The same would hap- pen for message 2 of user 2.
  • user 1 and user 2 would send only one a NAK for the set of messages after message 3 on the common uplink channel.
  • the transmitter detects the NAK and forms, in this case, a simple parity check packet of the last three messages. As this parity message is received successfully for both users, both users can reconstruct their missing message. Applying more sophisticated codes than parity check allows recovering more than one packet loss .
  • TSG GERAN Tdoc GP-032101 "Outer coding on RLC layer for MBMS over GERAN: Extension to multislot mode", Siemens, TSG GERAN #16, New York (USA), 25-29 August 2003.
  • TSG GERAN Tdoc GMBMS-0300002 "Performance of MBMS Radio Bearers", Nokia, TSG GERAN MBMS Workshop, Espoo (Finland), 12-13 May 2003.
  • TSG GERAN Tdoc GMBMS-0300007 "On MBMS bearer definition", Siemens, TSG GERAN MBMS Workshop, Espoo (Finland), 12-13 May 2003.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne un procédé de transmission de messages dans lequel un message est transmis d'une station de base à une pluralité de stations mobiles, et dans lequel un message de non accusé réception, qui signale par exemple un message comme ayant été reçu incorrectement, est transmis d'une station mobile à la station de base. Différentes stations mobiles parmi la pluralité mobile utilisent les mêmes ressources physiques, lesquelles sont attribuées uniquement au message détecté comme étant incorrect, pour la transmission du message de non accusé réception.
EP04787214A 2003-09-26 2004-09-24 Procede de transmission de messages, station mobile, station de base et systeme de communications Withdrawn EP1665842A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04787214A EP1665842A2 (fr) 2003-09-26 2004-09-24 Procede de transmission de messages, station mobile, station de base et systeme de communications

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03021869 2003-09-26
PCT/EP2004/052313 WO2005032174A2 (fr) 2003-09-26 2004-09-24 Procede de transmission de messages, station mobile, station de base et systeme de communications
EP04787214A EP1665842A2 (fr) 2003-09-26 2004-09-24 Procede de transmission de messages, station mobile, station de base et systeme de communications

Publications (1)

Publication Number Publication Date
EP1665842A2 true EP1665842A2 (fr) 2006-06-07

Family

ID=34384562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04787214A Withdrawn EP1665842A2 (fr) 2003-09-26 2004-09-24 Procede de transmission de messages, station mobile, station de base et systeme de communications

Country Status (2)

Country Link
EP (1) EP1665842A2 (fr)
WO (1) WO2005032174A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060003764A (ko) * 2004-07-07 2006-01-11 삼성전자주식회사 이동통신시스템에서의 동기 재전송 방법
WO2007148138A1 (fr) * 2006-06-23 2007-12-27 Siemens Aktiengesellschaft Retransmission de paquets
KR101364466B1 (ko) * 2007-06-22 2014-02-19 알까뗄 루슨트 Ｍｂｍｓ 데이터 재전송 방법 및 시스템

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6754894B1 (en) * 1999-12-03 2004-06-22 Command Audio Corporation Wireless software and configuration parameter modification for mobile electronic devices
GB0015621D0 (en) * 2000-06-27 2000-08-16 Koninkl Philips Electronics Nv Multicast radio communication system and apparatus
US7224702B2 (en) * 2000-08-30 2007-05-29 The Chinese University Of Hong Kong System and method for error-control for multicast video distribution

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005032174A3 *

Also Published As

Publication number Publication date
WO2005032174A2 (fr) 2005-04-07
WO2005032174A9 (fr) 2005-08-11
WO2005032174A3 (fr) 2005-10-06

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