WO2005112354A1 - Format d'unite de donnees par paquets de protocole a supertrame dote d'une agregation de paquets a plusieurs debits pour systemes sans fil - Google Patents

Format d'unite de donnees par paquets de protocole a supertrame dote d'une agregation de paquets a plusieurs debits pour systemes sans fil Download PDF

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Publication number
WO2005112354A1
WO2005112354A1 PCT/IB2005/051564 IB2005051564W WO2005112354A1 WO 2005112354 A1 WO2005112354 A1 WO 2005112354A1 IB 2005051564 W IB2005051564 W IB 2005051564W WO 2005112354 A1 WO2005112354 A1 WO 2005112354A1
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WO
WIPO (PCT)
Prior art keywords
superframe
data unit
protocol
mac
mcs
Prior art date
Application number
PCT/IB2005/051564
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English (en)
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WO2005112354A9 (fr
Inventor
Pen C. Li
Parag Garg
Monisha Ghosh
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Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to JP2007512703A priority Critical patent/JP2007537654A/ja
Priority to EP05736226A priority patent/EP1751921A1/fr
Publication of WO2005112354A1 publication Critical patent/WO2005112354A1/fr
Publication of WO2005112354A9 publication Critical patent/WO2005112354A9/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W99/00—Subject matter not provided for in other groups of this subclass
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to apparatuses and processes designed for use with a form of data transmission using a superframe having a plurality of packets. More particularly, the present invention relates to an improvement in multiple receiver aggregation (MRA) data rate transmission and power savings.
  • MRA multiple receiver aggregation
  • the physical layer of current wireless systems such as LANs that operate under access protocols such as IEEE 802.11, has several different options for modulation and coding. The selection of these options is normally determined by the maximum data rate given that the pack error rate is smaller than a given threshold. For example, the current Task Group N of IEEE Specification of 802.11 is developing new
  • the presently claimed invention provides a method, system and apparatus for providing a number of MAC Protocol Data Units MPDUs to a group of different receivers and linking them together to form a Super protocol data service unit (PDSU).
  • This Super PDSU is encapsulated in a Super Protocol Packet Data Unit (PPDU) header in order to be delivered to the different stations.
  • PPDU Super Protocol Packet Data Unit
  • the scheme supports delivery of the individual MPDUs at different PHY rates with a potential of executing an efficient power-saving scheme at the receiver device.
  • Fig. 1 illustrates a system having a plurality of stations and their different PHY transmission rates.
  • Fig. 2 illustrates criteria for forming a superframe format having packet aggregation.
  • Fig. 3A illustrates a header showing one way that a superframe can be arranged according to the present invention.
  • Fig. 3B illustrates the Super PDSU header portion of the superframe header shown in Fig. 3 A.
  • Fig. 4 illustrates an arrangement of the Super PDSU header that is adapted to increase the efficiency of the receipt of fragmented MSDU transmission.
  • Fig. 5 is an illustration of how an example of a Super PPDU provides power savings to several stations.
  • Fig. 6 is one example of a PPDU frame structure.
  • Fig. 1 illustrates a system having a plurality of stations and their different PHY transmission rates.
  • Fig. 2 illustrates criteria for forming a superframe format having packet aggregation.
  • Fig. 3A illustrates a header showing one way that
  • FIG. 7 illustrates one view structure of the aggregation information in accordance with Fig. 6.
  • Fig. 8 illustrates another view of the aggregation information in accordance with an aspect of the invention.
  • Fig. 9 illustrates active/sleep phases in accordance with an aspect of the invention.
  • Fig. 10 illustrates another variation of the structure of aggregation information in accordance with another aspect of the invention.
  • Fig. 11 illustrates yet another variation of the structure of aggregation information in accordance with another aspect of the invention.
  • Fig. 12 illustrates active/sleep phases in accordance with the aggregation information shown in Figs. 10 and 11.
  • Fig. 13 illustrates still another variation of the structure of aggregation information in accordance with another aspect of the invention.
  • Fig. 10 illustrates another variation of the structure of aggregation information in accordance with another aspect of the invention.
  • Fig. 14 illustrates active/sleep phases in accordance with the aggregation information shown in Fig. 13.
  • Fig. 15 illustrates still another variation of the structure of aggregation information in accordance with another aspect of the invention.
  • Fig. 16 illustrates active/sleep phases in accordance with the aggregation information shown in Fig. 15.
  • Fig 1 illustrates one typical example of a system for transmission of multi-rate aggregated packets according to the present invention. Again, it is stressed that a typical system would be far more complex than shown and may include a plethora of different devices communicating in a wired or wireless fashion.
  • the system shown in Fig. 1 includes a plurality of nodes 112, 113, 114 and a station 115. At least one of the plurality of nodes is adapted for receiving a superframe 125 comprising an aggregation of packets according to the present invention. In addition, one node 114 of the plurality of nodes 112, 113, and 114 may have a different PHY rate of transmission than the other nodes. It is also to be noted that at least one (typically more) of the plurality of nodes 112, 113, and 114 are adapted for receiving the superframe 125 comprising an aggregation of packets at different transmission rates 127, 128, and 129.
  • a series of different nodes with different transmission rates can use the superframe according to the present invention at rates that maximize their efficiency.
  • at least one of the plurality of nodes 112, 113, and 114 may comprise a legacy device 112 that transmits and receives non-aggregated packet frames according to medium access control (MAC) protocols.
  • MAC medium access control
  • Fig. 2 illustrates the criteria for forming a superframe format for packet aggregation according to the present invention.
  • MAC medium access control
  • a number of MPDUs may be grouped together if the delay bound by each individual MPDU can be met.
  • a beacon can be grouped along with the group-addressed frames following the same at DTIM intervals.
  • the Super PSDU is shown, which is then aggregated into a Super PPDU. It should be noted that the Super PPDU should not infringe on the TBTT time and a link adaptation algorithm may set a limit on the length of the Super PPDU.
  • the PDSUs that have a common device destination can be arranged adjacent to each other in the
  • the PDSU contains the MAC service data unit (MSDU) that has the 802.11 MAC header and the payload.
  • MSDU MAC service data unit
  • RA receiver address
  • Fig. 3 A illustrates a header of the Super Frame according to an aspect of the present invention.
  • the preamble 305 is a normal 802.11a PLCP (physical layer convergence protocol) preamble with 12 symbols.
  • the PLCP header 310 also has a parameter used to signify that the following frame is not a normal PDSU. The rate bits, or the reserved bits, can be used for this purpose.
  • the PLCP header that follows is a normal 802.1 la PLCP header. Each PLCP header except the one for the first PDSU is preceded by a preamble that may be used by the receiving station to synchronize.
  • Fig. 3 A illustrates a header of the Super Frame according to an aspect of the present invention.
  • the preamble 305 is a normal 802.11a PLCP (physical layer convergence protocol) preamble with 12 symbols.
  • the PLCP header 310 also has a parameter used to signify that the following frame is not a normal PDSU.
  • FIG. 3B is an illustration according to an aspect of the present invention that illustrates just the Super PDSU header 315 shown in Fig. 3 A.
  • the MAC address 320, preamble type, data rate 330, length 335 are shown.
  • These aforementioned fields for each of the PSDUs are sufficient for each station to calculate when it could start receiving data and for how long such receiving may occur.
  • the preamble type 325 field for the first MPDU may be ignored. The station can then decide to execute a power-saving scheme when it does not have to receive any data.
  • a Super Duration ID field (not shown) may precede the tuple for the first station. This field can be then used by the stations for the virtual carrier sense mechanism, and will obviate any such calculation at all the receivers.
  • the beacon can be a part of the Superframe with a restriction that it will be the first PDS of the Super PSDU headers 315.
  • the reason for the restriction is to meet the TBTT time before each beacon. If there are any power-saving stations in the basic service set, then the group addressed PSDUs will follow the Description Time-stamped beacon.
  • the stations will decode the timing (TIM) element in the beacon and respond with a power saving (PS) polling packet.
  • An access point (AP) will receive a plurality of polls within a beacon interval and aggregate the MSDU for those power-saving stations.
  • the PHY takes care of the acknowledgment reception at the transmitter of the Super PPDU.
  • the PHY maintains a record of unsuccessful PSDUs.
  • the present invention also can support fragmentation of the MSDUs.
  • a drawback would be that there will have to be a tuple for each fragment in the Super PSDU header.
  • the format of the Super PSDU header may be changed in order to make more efficient use of the medium in case of fragmented MSDU transmission.
  • Fig. 4 shows an arrangement of the Super PSDU header that is adapted to increase fragmented
  • Fig. 5 is an illustration of how an example of a Super PPDU according to the present invention provides efficient power at the station devices. As shown in Fig. 5 the PHY activity for stations 1-4 is curtailed as the stations all read the preamble 501, the PHY layer convergence protocol 503 and the Super
  • PSDU header 505. The nodes/station device can then go into a power-saving sleep mode, as shown by the low logic levels.
  • backward compatibility is maintained by an existing legacy device, which continues to transmit and receive using standard MAC protocols. This means that if a device transmits a non-Super PDSU, the rules of the virtual carrier sense apply according to standard MAC protocols.
  • there are the second through the seventh aspects of the present invention that may refer to an 802.1 In header structure that is different from 802.11a, but is backwards-compatible in the sense that legacy 802.11 and 802.1 le stations can extract all information that is necessary for performing the carrier sense and backoff mechanism. Fig.
  • L-STF Legacy Short Training Field
  • L-LTF Legacy Long Training Field
  • L-SIG Legacy Signal field
  • the number of HT-LTFs is equal to the number of antennas.
  • the different fields are not described in detail in this invention and only serve as an example of how the structure of the PHY header might look.
  • the PHY header is followed by the PSDU-DATA.
  • the information on the structure of an aggregate is partly contained in the PHY header and partly inside the PSDU-DATA.
  • the various aspects of the invention may differ in the way the information is distributed in-between the PHY header and the PSDU-DATA, and how the information is structured. For all aspects of the invention it is assumed that inside the PHY header the information is included inside the HT-SIG or similar field.
  • HT-SIG2 As other information is included in the HT-SIG field beside the aggregation information, the part including the aggregation information is referred to as HT-SIG2 in the following.
  • Fig. 7 shows the structure of the HT-SIG2 705 and PSDU-DATA 755 in the case of the second aspect of the invention for an exemplary group of five stations, two of which are transmitting at Modulation/Coding Scheme (MCS) 1, two others at MCS2 and a third one at a different MCS3. It is assumed for simplicity in this example that each station is sending just one MPDU. Transmission of multiple MPDUs per station is obviously possible.
  • MCS Modulation/Coding Scheme
  • the HT-SIG2 contains the following aggregation information for each of the stations STAs: • Receiver (STAs) MAC address • MCS of this MPDU • PDU Length.
  • STAs Receiver
  • MCS Physical channels Control
  • PDU Length a set of three fields is called a "tuple" because of the following:
  • the MPDUs, each consists of MAC header and payload.
  • the Receiver Address (RA) in the MAC header is the same MAC address as the one that appears in the 'MAC Addr' field of the HT-SIG2.
  • the Preambles 715,725,735,745 following the MPDUs are used by the receiving station to synchronize and demap the following MPDU at the desired data rate (indicated in HT-SIG2/ MCS Field).
  • a third aspect of the present invention differs from the second aspect of the invention with regard to the function of a tuple.
  • a tuple in the HT-SIG2 field can refer to multiple MPDUs for the same destination device.
  • An additional field 708 is included in a tuple that indicates the number of MPDUs for the respective destination device.
  • the MPDUs and respective fragments of the tuple may or may not be of the same size, as the PDU Length field indicates the total length of all MPDUs for this destination device.
  • these fields are sufficient for an STA to calculate when it should start receiving data and for how long.
  • One advantage of the present invention is that the STA can decide to execute a power-saving scheme when the STA need not receive any data.
  • Fig. 9 shows the sleep-awake periods at the five stations (STA1 to STA6) used as examples in
  • Figs. 7 and 8 to illustrate the second and third aspects of the invention during the reception of a typical aggregated PSDU with different receivers and the sleep mode of a sixth station STA6, which is not mentioned as receiver in the PSDU.
  • This STA6 can remain in a sleep mode during the whole frame transmission due to HT-SIG2's containing the MAC Addresses of the receiving STAs of this PSDU. It can be seen that STA6 remains at a low level (indicating sleep) throughout the PSDU.
  • the HT-SIG2 and PSDU-DATA illustrate frame formats of a fourth aspect of the present invention. Similar to previous examples, five stations are illustrated, two of which are transmitting at MCS1, two others at MCS2 and the third one at a different MCS3.
  • MPDUs using the same MCS are grouped.
  • the following aggregation information is included in the HT-SIG2 field for each group of receiving STAs with the same MCS: • MCS for a group of STAs with the same MCS (MCS Aggregate) • Length 1015 of all aggregates with the same MCS • Nr.
  • Receivers 1016 (to indicate how big the next subfield will be that contains the MAC Addresses of the STAs) • List of Receiver Addresses 1017.
  • the PSDU contains all MPDUs (MAC Header + Payload) and attaches to them an MPDU_Delimiter (Length and CRC) 1025 in order to separate MPDUs and to indicate the length of the next MPDU.
  • the MPDU delimiter may, for example, contain the length of the following MPDU, a Cyclic Redundancy Check (CRC) sum as well as a unique pattern.
  • CRC Cyclic Redundancy Check
  • the PREAMBLE is only used in order to separate aggregates of different MCSs.
  • Fig. 11 illustrates the HT-SIG2 and PSDU-DATA frame formats of a fifth aspect of the present invention using the previous example of five stations, two of which are transmitting at MCS1, two others at MCS2 and the third one at a different MCS3.
  • Fig. 12 shows the sleep-awake periods at the five stations (STA1-STA5) during the reception of a typical aggregated PSDU according to the fourth and fifth aspects of the invention, and the sleep mode of a STA6, which is not listed as receiver.
  • This STA6 can remain in a sleep mode during the whole frame transmission due to HT-SIG2's containing the MAC Addresses of the receiving STAs of this PSDU.
  • FIG. 13 illustrates, in contrast to the previously discussed aspects of the invention, a sixth aspect of the invention wherein the detailed information about the receivers is not contained in the HT-SIG2 field but inside the PSDU-DATA in an additional MPDU named MRAD (Multiple Receiver Aggregation Descriptor) according to TG Sync specification.
  • MRAD Multiple Receiver Aggregation Descriptor
  • This MPDU contains the MAC Addresses of all STAs, whose MPDUs will be included in the following MCS Aggregate.
  • the PREAMBLE is used to separate aggregates of different MCSs.
  • the MRAD also can contain the number of MPDUs for this MAC address and/or the length of all MPDUs intended for the respective address.
  • Fig. 14 shows the sleep-awake periods at the five stations (STA1-STA5) during the reception of a typical aggregated PSDU according to the sixth aspect of the invention, and the sleep mode of a STA6, which is not listed as receiver.
  • STA6 must wake up at the beginning of each MCS aggregate, synchronize with the preamble and decode the MRAD MPDU, in order to check whether its address is mentioned as a receiver. Only if the STA is not listed as receiver can it fall back into the sleep mode.
  • Fig. 15 the HT-SIG2 and PSDU-DATA frame formats are shown to illustrate a seventh aspect of the present invention using the previously allotted number of five stations, two of which are transmitting at MCS1, two others at MCS2 and the third one at a different MCS3.
  • the detailed information about the receivers is contained in the PSDU-DATA in an additional Super-MRAD MPDU 1525.
  • This Super-MRAD MPDU 1525 contains: • Number of receivers 1527 • MAC addresses 1529 of receivers of this MSC • After each receiver MAC address: length 1531 of the MPDUs for the respective receiver • Optionally: After each receiver MAC address and length: Number of MPDUs for the respective receiver.
  • Fig. 16 illustrates the sleep-awake periods at the five stations (STA1-STA5) during the reception of a typical aggregated PSDU according to the sixth aspect of the invention, and the sleep mode of a STA6, which is not listed as receiver.
  • the Superframe having a plurality of aggregated packets could have different arrangements of the header than shown, according to need or preference.
  • the systems can use many different types of nodes, and the transmission can be wired or wireless. Protocols other than 802.11 can be used also, so long as they are adapted to accept packet aggregation.

Abstract

Selon la présente invention, une supertrame, un procédé et un système de transmission d'une agrégation de paquets à plusieurs débits comprennent une en-tête (300) pourvue d'un préambule (305) et d'un protocole de convergence de couche physique (PHY) (310), une pluralité d'unités de données de protocole de gestion de contrôle d'accès au support (MAC) (205), une balise, et une en-tête d'une super unité de données du service de protocole (315). Une pluralité de paquets agrégés à plusieurs débits (327) sont regroupés ensemble dans la supertrame de manière à permettre des économies d'énergie des noeuds de réception qui peuvent recevoir les paquets dans un nombre réduit de transmissions. Le groupement des paquets, en fonction des destinations MAC, permet aussi de raccourcir les temps de réception des noeuds, ce qui se solde par des économies d'énergie. La supertrame permet aux unités de données de service MAC d'être acheminées jusqu'à chacun desdits noeuds, à des débits PHY différents en vue d'optimiser l'efficacité.
PCT/IB2005/051564 2004-05-13 2005-05-12 Format d'unite de donnees par paquets de protocole a supertrame dote d'une agregation de paquets a plusieurs debits pour systemes sans fil WO2005112354A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2007512703A JP2007537654A (ja) 2004-05-13 2005-05-12 無線システム用のマルチレート・パケット・アグリゲーションを有するスーパーフレーム・プロトコルパケットデータユニット・フォーマット
EP05736226A EP1751921A1 (fr) 2004-05-13 2005-05-12 Format d'unite de donnees par paquets de protocole a supertrame dote d'une agregation de paquets a plusieurs debits pour systemes sans fil

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US57063804P 2004-05-13 2004-05-13
US60/570,638 2004-05-13
US61471704P 2004-09-30 2004-09-30
US60/614,717 2004-09-30

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WO2005112354A1 true WO2005112354A1 (fr) 2005-11-24
WO2005112354A9 WO2005112354A9 (fr) 2006-11-30

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