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Further study on the tradeoffs for directly transmitted high rate and various higher chipping rate redundancy forms is needed. Any of these plans can be implemented with/without infrastructure support. That is a separate issue. Portable Parameters For the 1.2 Mb/s system, the channelized spread spectrum system is suggested. Only in this way can the codedivision property be used) .@+@+:: to advantage. Without the codedivision channelization, spread spectrum gives too little capacity relative to the occupied bandwidth. The gain results from the possible simultaneous use of overlapping Accesspoints. High Function Parameters DDKFor the 12 Mb/s system, sequential use of a common channel is preferred. Spread spectrum cannot realize the signaling rate within a 20 MHz band, but it might in an 80120 MHz band (ISM at 2.45/5.9 GHz). 8) .@+@+::*  @+@+::8 #Xl2P0kXP#  Part III Access Methods ă #\2PP# OVERVIEW It has been possible to define a methodology for access method which has commonality between many of the possible choices for the physical medium. The inherently burst nature of the inward transmission from Stations requires that each burst contain: a)Xstart synchronization, b)overhead, c)Xpayload, d)Xend delimiting. If the absolute requirement for infrastructure and Accesspoints is to be avoided, then the same applies to transmissions toward the Station. There is now a question of whether these bursts are: 1),fitted within a uniform timed frame structure within which all transmissions are fitted, or 2),allotted within a dynamically dimensioned timed frame structure, or 3),asynchronously timed dependent on the presence of a preceding message, except for sequence initiation. Notwithstanding the arguability, the third case is assumed. It is asserted that this provides necessary flexibility and independence of the detail of the physical medium. It is elsewhere asserted that this also provides high relative efficiency in the use of channel time, but this is aside from the present generic issues. Each of the possible sequences has its own defined overhead structure within a message format containing the elements a)d) above. It has been found that the same or only slightly modified message set can be used for all of the forms of physical medium and access method as follows: i)Common Channelno infrastructure ii)Common Channelinfrastructure controlled iii)Channelizedno infrastructure iv)Channelizedinfrastructure controlled0* .@+@+::Ԍ Contribution Identification DDKThree contributions have been prepared to describe specifically the four types of Accessmethods in i)iv) above. The two types for a common channel system are both described in one contribution. These papers are identified as follows: IEEE P802.11/9195`X(#f(File: 11APS18F) Sequentiallyused Common Channel Access Method DDKWith and without infrastructure, sequential use of one channel at all Accesspoints within one reuse group. (Revision of IEEE 802.11/9119) IEEE P802.11/9196`@(#f(File: 11CTN18A) Access Method for Channelized system Using Distributed Logic and Not Requiring Infrastructure DDKIndependent of infrastructure and without virtual circuit support, random contention use of a common setup channel and distributed channel selection for following use of one of several data transfer channels. IEEE P802.11/9197`(#f(File: 11API18D) Channelized System Access Method Using Infrastructure Control DDKWith infrastructure control, sequential use of a common setup channel and parallel use of a number of data transfer channels derived by codedivision spread spectrum or otherwise. DDKEarlier relevant contributions include: IEEE P802.11/9119`(#g(File: 11AP12J) Access Protocol for IVD Wireless LAN DDKThe basis of the protocol is a single channel binary data link used alternately by the fixed common control network and a number of fixed or moving STATIONs. All protocol elements are data messages which do not depend in any way on special properties of the physical medium apart from requiring rapid switching between ON and OFF states. 80* .@+@+:: + < <@+@+::8 There are many ACCESSPOINTS in the fixed network each of which serves one or a small number of the total number of user STATIONs in an indefinitely large network. The possibility of direct STATIONtoSTATION transfer is provided. An infrastructure independent mode might be supported by a default Accesspoint simulation incorporated in Stations. IEEE P802.11/9180`P0(File: 11AP16K) Access Protocol for IVD Wireless LANPart II "A short summary of the main changes (relative to P802.1119) and current Message/Field List is given ..." BRIEF DESCRIPTION OF ACCESS METHODS All of the current contributions depend on use of the common message set and field definition contained in contribution 80 above referenced. Insofar as possible, the access methods do not depend on specific implementation of the physical medium. The minimum required degree of channelization is dependent on required signaltointerference ratios from overlapping coverage, and this may be different for various modulation and radio frequency techniques. The reuse pattern assumed is conservative enough to work with most technical choices. All of the described access methods fit within the generic classifications shown above. Sequentiallyused Common Channel Access Method (P802.11/9195) This access method uses a single highdatarate channel sequentially at overlapping and interfering Accesspoints (one reuse group) all under the control of a single Access Manager within a multiport Hub Controller. In general, the capacity can be equal to the parallel use of a lower rate at the same number of Accesspoints in a channelized system. The primary plan requires infrastructure, but permits direct StationtoStation transfers when it is possible. The plan provides connectiontype service consistent with IEEE 802.6 cell format.@).@+@+::ԌDDKA secondary version of the plan is given for operation without infrastructure and without support of connectiontype services. DDKThe previous contribution (IEEE 802.11/9119) on access method is superseded in detail use of messages by the current contribution (IEEE 802.11/9195), however, the original contribution contains material on calculated efficiency and compatibility with 802.6 ATM cell transfer which remains relevant though slightly inaccurate because of increases in message lengths to allow channelization and multiple simultaneous connections at one Station. The purpose of this revision is to present the single timeshared channel concept consistently with channelized systems elsewhere presented, and to incorporate the common message set for all of the methods. Access Method for Channelized System Using Distributed Logic and Not Requiring Infrastructure (P802.11/9196)  DDKThis medium access method uses one setup and nine (or N) data transfer channels in which any Station can transmit at any time on the setup channel without reference to whether or not signal is present. The channelization is assumed to be codedivision within a spread spectrum modulation, but is not limited to this possibility. DDKThe main assumption is that there is always a probability of a lost message or transmission from uncontrollable factors like path obstruction and multipath. Contention may be allowed within the system as long as its relative probability is less than or the same order of magnitude as other message loss mechanisms. DDKThis access method is optimized for peertopeer communication without use of infrastructure. Infrastructure may be used as a means of providing communication in the same network but not within radio range of each other, and to provide a means for each Station to reach destinations outside of the local network. DDKThis access method is not suitable for a virtual circuit service. 80*.@+@+::0*jk>@+@+::8Ԍ Channelized System Access Method Using Infrastructure Control (P802.11/9197)  This access method is based upon a system plan with codedivisionspreadspectrum channelization of 10 or 17 channels which is optimized for largescale, wide area use. The method depends upon infrastructure access control. Contention is allowed for Stations requesting access within a limited set of contenders; however, allotment of a data transfer channel is exclusive within one reuse cluster. The protocol is implemented with sequential message transfers using the referenced message set. Full provisions have been made for direct peertopeer communication and virtual circuits with demandassigned bandwidth. It is possible that the access method could be expanded to include the noninfrastructure mode of 96 above when there is no infrastructure available. MESSAGE SUMMARY  The following is a summary listing of messages used in the above access methods as given in greater detail in 80.`.@+@+:: CONCLUSION  DDKIt is possible to classify access methods generically. Access methods are possible which have high commonality for many different physical mediums and system optimization factors. Multiple operating modes for different environments may be considered within one implementation.8.@+@+::Ptm@+@+::8ԯ  J@ (#d(#҇ & TABLE VI ׃ Type#Function `d<Oct lgthă 001Segment Data Frameshort address`d>10+PDU 003Packet Data Framelong address`d>25+PDU 005Invitationtorequest` dC8 007Poll or Invitationtoregister` dC8 009Set Channel/Power` dC8 011Acknowledgment` dC8 013NACKrepeat` dC8 015Grant` dC9 100Segment Data Frameshort address`d>10+PDU 102Register`dB13 104Deregister`dB13 106Requestshort address`dB11 108Requestlong address`dB23 110Acknowledgment` dC7 112NACKrepeat` dC7 114Packet Data Frame`d>10+PDU 115Grant StnStn` dC9).@+@+:: 8@.@+@+::)@@+@+::8ԯ).@+@+::    XXXX Xf ` #\  PButHP#DRAFT`,(#^DOC.: IEEE P802.11/91 94 ă    yxbdddy2Yf  yxXdddy    yO. #\\  PRu\P#Printed: August 26, 1991@Page `D(#_System ChoicesRypinski2  .@+@+:: = 3'3'Standard'3'3StandardVrJet III;Xr_XX #xP7 )YP#     c Addx  addx~ c "@" c  &TRANSMISSION  )FORMAT6  \APPLICATION & ACCESS METHOD REFERENCE$ $  RNO INFRASTRUCTURE- "&WITH }#INFRASTRUCTURE&   & CHANNELS MODULATION "JLOW RATE "`0HIGH RATE "u!LOW RATE "'HIGH RATE&    H & SINGLE CHANNEL SPREAD S *95  NR *95 *95&    P &  NARROW B NR  *95 *95 *95&  P @ @ & MULTI CHANNEL SPREAD S *96  NA *97 NA& @ @     &  NARROW B NR  *96 NR *97     NA = NOT APPLICABLE NR = NOT RECOMMENDED * = IEEE 802.11/91