EP0653131A1 - Procede et appareil permettant de vehiculer un champ de donnees dans un systeme de communication - Google Patents

Procede et appareil permettant de vehiculer un champ de donnees dans un systeme de communication

Info

Publication number
EP0653131A1
EP0653131A1 EP94917297A EP94917297A EP0653131A1 EP 0653131 A1 EP0653131 A1 EP 0653131A1 EP 94917297 A EP94917297 A EP 94917297A EP 94917297 A EP94917297 A EP 94917297A EP 0653131 A1 EP0653131 A1 EP 0653131A1
Authority
EP
European Patent Office
Prior art keywords
field
data
communication system
control information
control
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Withdrawn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
EP94917297A
Other languages
German (de)
English (en)
Inventor
Kenneth A. Felix
Anthony K. Dean
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.)
Motorola Solutions Inc
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
Publication of EP0653131A1 publication Critical patent/EP0653131A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the invention relates generally to communication systems and more particularly to conveying fields of data in a communication system.
  • Digital communication systems such as time division multiplexed (TDM) communication systems, require transmission on a given radio frequency (RF) carrier signal during timeslots.
  • RF radio frequency
  • Transmission of voice information does not present a problem in the system since a particular coding rate (and consequently a time duration) is chosen to sufficiently meet the time constraints of the TDM timeslot.
  • problems are introduced into the system. Since the messages typically are generated at a particular layer of the communication system (where a layer is a convenient separation between functions pertaining to different levels of a communication system), typical solutions involve a segmentation scheme at a particular layer (say layer n) above the air interface, or data link layer.
  • Such schemes are inadequate for two reasons. First, they recode the original message into multiple data link layer messages, each of size less than one timeslot. In order for a layer at a receiving unit to reassemble the message, layer n information is passed with each timeslot transmitted. Consequently, the resulting number of bits that are required to be transmitted is increased by the number of bits in a layer n header multiplied by the number of segments (or timeslots) needed to transmit the message. Second, if the layer n message fails to transmit correctly, the layer n entity has no recourse but to retransmit the entire message, including all of the timeslots required to transmit the message. Since the timeslot channel is a high bit error rate environment, retransmission of the entire message may, and does, frequently occur.
  • GSM group special mobile
  • FIG. 1 generally depicts a communication system which utilized to implement message segmentation in accordance with the invention.
  • FIG. 2 generally depicts a transceiver (transmitter/ receiver) utilized in the communication system of FIG. 1 which employs message segmentation in accordance with the invention.
  • FIG. 3 generally depicts a series of frames conveyed for a particular radio frequency (RF) carrier as utilized by the communication system of FIG. 1.
  • RF radio frequency
  • FIG. 4 generally illustrates the structure of a frame utilized by the communication system of FIG. 1.
  • FIG. 5 generally illustrates the structure of a downlink timeslot utilized by the communication system of FIG. 1.
  • FIG. 6 generally illustrates the structure of a modified downlink timeslot utilized by the communication system of FIG. 1 in accordance with the invention.
  • FIG. 7 generally illustrates the structure of a modified uplink timeslot utilized by the communication system of FIG. 1 in accordance with the invention.
  • FIG. 8 generally depicts the structure of the second control information field of the modified downlink timeslot of FIG. 6 and the modified uplink timeslot of FIG. 7 in accordance with the invention.
  • FIG. 9 generally depicts segmentation of a field of data in accordance with the invention.
  • FIG. 10 generally depicts recombination of segments of data to produce a field of data in accordance with the invention.
  • FIG. 11 generally depicts an alternate embodiment of a modified downlink timeslot in accordance with the invention.
  • the communication system splits layers, namely layer 2, into an upper and lower sub-layer in accordance with the invention.
  • the upper layer consists of normal layer 2 functions such as address and flow control capabilities, which cover the entire message with a message comprising one or more slots.
  • the lower-layer 2 would provide error detection and re-transmission capabilities on a timeslot basis such that retransmission of a segment of data is on a timeslot basis rather than on an entire message basis.
  • FIG. 1 depicts a communication system 100 which may beneficially employ the present invention.
  • the communication system 100 is a time division multiplexed (TDM) personal communication system (PCS).
  • TDM time division multiplexed
  • PCS personal communication system
  • unit 103 is a mobile subscriber unit utilized by a pedestrian while unit 106 is a fixed subscriber unit which may be, for example, utilized as a wireless local loop replacement.
  • units 103 and 106 will be designated as subscriber units 103, 106 hereinafter.
  • FIG. 2 generally depicts a transceiver (transmitter/receiver) 200 which may beneficially employ the present invention.
  • the upper half of FIG. 2 generally represents the transmitter portion 204 of transceiver 200.
  • base-sites 109, 112 and subscriber units 103, 106 employ transceiver 200 depicted in FIG. 2.
  • base-sites 109 and 112 are identical.
  • upper layer information 201 is input into a segmentator 202 which segments a field of data contained within upper layer information 201.
  • a multiplexer, MUX 203 multiplexes the segments of data produced by segmentator 202 to ready the segments of data for transmission as shown in FIG. 9.
  • Upper layer information (ULI) 201 consists of ULI for timeslosts 0-9 as depicted in FIG. 9, but is shown as only one input for convenience.
  • output of MUX 203 is input into data input 206 which adds a second control information field to each segment of data to be transmitted in the user information field.
  • the output of data input 206 is input into a conventional modulator 212, up-converted in frequency by mixer 218 and intermediate frequency (IF) signal 215, filtered by IF 221 and eventually up-converted in frequency again by mixer 227 and local oscillator (LO) 224.
  • the output of mixer 227 is input into a conventional power amplifier, designated by power output 230, and transmitted to a receiving unit via a conventional antenna 233.
  • Controller 209 controls operation of segmentator 202, MUX 203 and also provides LO 224 to mixer 227.
  • controller 209 is a 68000 series microprocessor by Motorola.
  • the lower half of FIG. 2 generally depicts the receiver portion 234 of transceiver 200.
  • a signal 236 transmitted by a transmitter portion 204 is received by a conventional antenna 233 and input into RF input 235.
  • RF input 235 contains typical front-end receiver equipment such as, inter alia, duplexers, splitters, etc (not shown).
  • the output of RF input 235 is input into mixer 239 and is subsequently down- converted by LO 242.
  • the output of mixer 239 is filtered by IF 245, whose output is then input into mixer 251 and again down- converted by IF signal 248.
  • the output of mixer 251 is input into demodulator 254 which demodulates this signal.
  • Output from demodulator 254 is input into a demultiplexer (DEMUX) 257 which basically undoes the multiplexing function performed by
  • DEMUX demultiplexer
  • MUX 203 of transmitter portion 204 Output of DEMUX 257 is actually output for each timeslot 0-9 as shown in FIG. 10, but is shown as only one output in FIG. 2 for convenience. Contining, output from DEMUX 257 is the transmitted segments of data which are then input into recombiner 263 where they are appropriately recombined to produce the original field of data. Further detail is depicted in FIG. 10.
  • FIG. 3 generally depicts a series of frames conveyed for a particular radio frequency (RF) carrier as utilized by the communication system of FIG. 1.
  • the series of frames conveyed for a particular RF carrier represent signal 236 shown in FIG. 2.
  • FIG. 4 generally depicts the structure of the frames depicted in FIG. 3.
  • the basic structure of a frame 403 is 10 TDM timeslots 406 for each RF carrier, or channel.
  • the RF channel requires 500 Kbps capacity or 50 Kbps per timeslot in a 10 timeslot per frame configuration as depicted in FIG. 4. This allows for 32 Kbps speech and its accompanying fields.
  • Speech coding is provided by Adapative Delta Pulse Code Modulation
  • FIG. 5 depicts a prior art representation of a downlink timeslot 500 having a field of data consisting of at least control information and user information. As depicted in FIG. 5, 14 bits represent bits for subscriber unit 103, 106 frame initialization and are represented by 501. Nine bits are found in control information field 503, which in the preferred embodiment is a system control field.
  • control information field 503 are allocated as follows: (1) five bits are used to represent 1 of 32 combinations for a digital color code utilized to represent a particular base-site; (2) one bit is utilized to represent transmission of either user information or control information; (3) one bit is utilized to represent that user information transmitted is either voice or data; and (4) two bits are utilized to represent segmentation control ("00" - continuation slot, "01" - beginning slot, "10" - end slot, and "11" - single slot).
  • 64 bits represent user information field 506 and are utilized to transmit, inter alia, speech, user data or robbed control data signaling, and these bits correspond to a multiplexed bit rate of 32 Kbps per timeslot. Twelve bits 509 are for joint error detection and synchronization by a receiving unit and a final single bit 512 is utilized for power control of a power control channel (PCC).
  • PCC power control channel
  • FIG. 6 generally depicts a modified downlink timeslot 600 in accordance with the invention.
  • Downlink timeslot 600 is similar to downlink timeslot 500 depicted in FIG. 5, however, a second control information field 606 has been added to downlink timeslot 600.
  • first control information field 603 is identical to control information field 503, and as such represents a system control field.
  • Second control information field 606 represents a segmentation control field.
  • FIG. 7 depicts a modified uplink timeslot 700 likewise having a second control information field 709 added thereon.
  • the 56 bit fields depicted in FIG. 6 and FIG. 7 represented by 609, 720 are remainders of the user information field 506 initially discussed in reference to FIG. 5.
  • Second control information field 606, 709 is generally depicted in FIG. 8, with a set of commands and corresponding bit values disclosed in Table 1 below.
  • second control information field 606, 709 is one of either a standard HDLC layered protocol or a Lap B/Lap D protocol.
  • the HDLC protocol is an ANSI standard for the United States, while the LapB/LapD protocol is described in CCITT Recommendation X.25 and is a European standard.
  • Second control information field 606, 709 occurs in every timeslot 0-9 of timeslots 406 shown in FIG. 4. Consequently, when information is passed from, for example, a base-site 109 to a subscriber unit 103 (or vice versa), send/receive sequence numbers are transferred back and forth on a timeslot basis rather than an entire message basis.
  • An operational scenario flows in the following manner from higher layers to lower layers.
  • Messages are generated at the User Application, Layer 3 or Layer 2 levels. If generated at the User Application or Layer 3 level, they pass down to Layer 2 and are placed in a Layer 2 transmission buffer queue. The message can also be generated at Layer 2, and as such would also be placed in the transmission buffer queue.
  • This transmission buffer queue in reality, consists of various priority queues that are sorted according to message type and is located at data input 206 of transmitter portion 204 of FIG. 2.
  • FIG. 9 generally depicts segmentation of a field of data in accordance with the invention.
  • upper layer information (ULI) 201 consists of ULI from timeslots 0-9 as depicted in FIG. 4.
  • ULI for each timeslot 0-9 is input into a message formatter 903 for each particular timeslot.
  • Output from formatter 903 is input into segmentator 202 which the field of data (ULI) into segments of data for transmission in fields 609, 712.
  • MUX 203 multiplexes the segments of data into the remainder of user information field 609, 712 such that the resulting "frame" looks essentially like the frame of FIG. 4.
  • segmentator 202 segments the field of data, or ULI into 56 bit segments of data.
  • data input 206 adds the lower layer information (LLI), represented by second control information field 606, 709 to the segments of data.
  • LLI lower layer information
  • the presence of second control information field 606, 709 is transparent to the message transmission except in the case where some of the timeslots are received in error. In such cases, the second control information field 606, 709 requests retransmissions based on the information content of a reject message.
  • the length of the field of data i.e. the length of the message
  • Numbering of timeslots is contiguous over message boundaries. For the last slot of a message, for example slot 908, and for single slot information messages, the "F" bit disclosed in FIG.
  • Recombination of segmented data of a field of data is depicted in FIG. 10.
  • DEMUX 257 demultiplexes the demodulated timeslots into separate timeslots where data output 260 reads the control information from second control information field 606, 709 (i.e. LLI 1003 of FIG. 10).
  • the segmented data in user fields 609, 712 is input into recombiner buffer 263 where the segments are stored until the entire message is received.
  • message formatter 1000 formats the segments into the entire field of data. In this manner, each segment of data transmitted in its own timeslot and having its own specific control field, is recombined at a receiving unit to provide the field of data.
  • the downlink timeslot may be modified as that depicted in FIG. 11.
  • alternate downlink timeslot 1100 has segmentation control 1103 removed from the 9 system control bits and is now implemented in second control information field 606, 709.
  • the six remaining bits are LapD control field 1106, which has essentially the make-up of second control information field 606, 709 as shown in FIG. 8.
  • Two bits (one bit each from N(R) and N(S) of Table 1) from second control information field 606, 709 of FIG. 8 are not utilized in downlink timeslot 1100 depicted in FIG. 11, however operation as a standard HDLC protocol or a LapD/LapB protocol is still maintained.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Communication Control (AREA)

Abstract

Un système de communication (100) segmente un champ de données de sorte que des segments de données sont transmis dans leur propre tranche de temps avec leur propre champ de commande. Le système de communication (100) segmente le champ de données en segments de données, ajoute une commande à la tranche de temps dans un champ destiné à l'information de l'utilisateur, et transmet les données segmentées et la commande pendant les tranches de temps à une unité réceptrice. Cette dernière reçoit les tranches de temps, stocke le segment de données représentant un segment du champ, et recombine les segments pour produire le champ de données. Lorsqu'une retransmission est requise par une unité réceptrice, l'unité émettrice ne retransmet que la tranche de temps unique contenant le segment de données présentant des erreurs de transmission. Il n'est jamais nécessaire de retransmettre des tranches de temps multiples, puisque chaque tranche de temps contient un segment discret du champ de données.
EP94917297A 1993-05-28 1994-05-02 Procede et appareil permettant de vehiculer un champ de donnees dans un systeme de communication Withdrawn EP0653131A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US6891393A 1993-05-28 1993-05-28
US68913 1993-05-28
PCT/US1994/004894 WO1994028651A1 (fr) 1993-05-28 1994-05-02 Procede et appareil permettant de vehiculer un champ de donnees dans un systeme de communication

Publications (1)

Publication Number Publication Date
EP0653131A1 true EP0653131A1 (fr) 1995-05-17

Family

ID=22085518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94917297A Withdrawn EP0653131A1 (fr) 1993-05-28 1994-05-02 Procede et appareil permettant de vehiculer un champ de donnees dans un systeme de communication

Country Status (5)

Country Link
EP (1) EP0653131A1 (fr)
JP (1) JPH07509595A (fr)
CA (1) CA2140029A1 (fr)
FI (1) FI950327A (fr)
WO (1) WO1994028651A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU651857B2 (en) * 1990-12-04 1994-08-04 Portals Limited Security articles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI103854B (fi) * 1996-11-01 1999-09-30 Nokia Mobile Phones Ltd Tiedonsiirtomenetelmä, solukkojärjestelmä ja matkaviestin
GB9928170D0 (en) * 1999-11-29 2000-01-26 British Telecomm Indirect data transmission

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5007051A (en) * 1987-09-30 1991-04-09 Hewlett-Packard Company Link layer protocol and apparatus for data communication
US5214642A (en) * 1989-02-21 1993-05-25 Hitachi, Ltd. ATM switching system and adaptation processing apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9428651A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU651857B2 (en) * 1990-12-04 1994-08-04 Portals Limited Security articles

Also Published As

Publication number Publication date
WO1994028651A1 (fr) 1994-12-08
JPH07509595A (ja) 1995-10-19
CA2140029A1 (fr) 1994-12-08
FI950327A0 (fi) 1995-01-26
FI950327A (fi) 1995-01-26

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