CA2240766A1 - Method of assigning time slots, as well as system, center, and subscriber facility for carrying out this method - Google Patents
Method of assigning time slots, as well as system, center, and subscriber facility for carrying out this method Download PDFInfo
- Publication number
- CA2240766A1 CA2240766A1 CA002240766A CA2240766A CA2240766A1 CA 2240766 A1 CA2240766 A1 CA 2240766A1 CA 002240766 A CA002240766 A CA 002240766A CA 2240766 A CA2240766 A CA 2240766A CA 2240766 A1 CA2240766 A1 CA 2240766A1
- Authority
- CA
- Canada
- Prior art keywords
- center
- time
- subscriber
- time slots
- slot
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 101100272852 Clostridium botulinum (strain Langeland / NCTC 10281 / Type F) F gene Proteins 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 2
- 101100161469 Arabidopsis thaliana ABCB23 gene Proteins 0.000 description 1
- 101100132433 Arabidopsis thaliana VIII-1 gene Proteins 0.000 description 1
- 101100324822 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) fes-4 gene Proteins 0.000 description 1
- 101150115605 atm1 gene Proteins 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J4/00—Combined time-division and frequency-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0298—Wavelength-division multiplex systems with sub-carrier multiplexing [SCM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5603—Access techniques
- H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
- H04L2012/5605—Fibre
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5603—Access techniques
- H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
- H04L2012/5606—Metallic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5603—Access techniques
- H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
- H04L2012/5607—Radio
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5614—User Network Interface
- H04L2012/5615—Network termination, e.g. NT1, NT2, PBX
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5672—Multiplexing, e.g. coding, scrambling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5679—Arbitration or scheduling
Abstract
A method is disclosed for assigning time slots in a system comprising a plurality of subscriber facilities (NT) connected to a center (HUB) via a common medium, the common medium being divided into a plurality of frequency or wavelength channels which are subdivided into time slots. The center assigns time slots to at least part of the subscriber facilities by specifying one channel and one time-slot number for each assigned time slot. After each time slot used, each subscriber facility involved changes to the next allocated channel. Each subscriber facility involved sends information in the time slot with the next assigned time-slot number. Also disclosed are a system, a center, and a subscriber facility for carrying out this method.
Description
-, CA 02240766 1998-07-16 Method of Assigning Time Slots, as well as System, Center, and Subscriber Facility for Carrying Out this Method This invention relates to a method of assigning time slots in a system comprising a plurality of subscriber facilities connected to a center via a common medium, the common medium being divided into a plurality of frequency or wavelength channels which are subdivided into time slots, as set forth in the preamble of claim 1, to a system as set forth in the preamble of claim 2, to a center as set forth in the preamble of claim 3, and to a subscriber facility as set forth in the preamble of claim 4.
In all systems with multiple access to a common medium, the question arises how to control the access to this medium. In radio transmission over the medium "airwaves", for example, the medium is apportioned by international agreements and frequency allocations based thereon. For some other media, too, such as fiber-optic and coaxial-cable networks, fixed allocations have been made. However, at least part of the total capacity must be assigned on demand.
For such cases, it is common practice to assign time slots for the duration of one call. For a variable traffic volume or for a constant traffic volume in an asynchronous environment, it is also common practice to assign to each call a channel within which the respective time slots to be used are then determined by some kind of mechanism.
In assigning a channel to a call, the respective parameters of the calls already assigned to this channel have to be taken into account. It may be necessary to first switch other calls to another channel before a channel has sufficient residual capacity for the new call. Still, an at least short-time bottleneck may occur in a channel due to variations in the traffic volume of the individual calls, while at other times, the same channel is only little loaded.
The object of the invention is to manage the capacity of the channels more effectively.
According to the invention, this object is attained by a method according to the teaching of claim 1, a system according to the teaching of claim 2, a center according to the teaching of claim 3, and a subscriber facility according to the teaching of claim 4.
Thus, all time slots in all channels are used as a common pool. Each time slot is assigned together with a channel allocation.
Further advantageous features of the invention are defined in the subclaims and will become apparent from the following description.
The invention will now be explained in more detail with reference to the accompanying drawings, in which:
Fig. 1 shows a major access system for cable television and ATM comprising systems, centers, and subscriber facilities according to the invention for carrying out the method according to the invention; and Fig. 2 shows a frame structure for carrying out the method according to the invention.
First, the environment in which the method according to the invention is used will be described with the aid of Fig. 1.
The starting point is a television cable distribution network TVN with a head end TVHE. At least part of the subscribers connected to this network are to be additionally connected to an ATM network ATM. The ATM
network ATM is shown here by three interconnected exchanges and a database.
To connect subscribers to both the cable distribution network and the ATM network, a center according to the invention is provided, which is designated here as HUB, a term commonly used for such a center by experts. To connect subscriber facilities NT to the two networks, a hybrid network is shown in this example. From the center HUB to a distribution unit BONT, an optical fiber is used. From the distribution unit BONT to the subscriber facility NT, a network of . .
branching coaxial cables containing amplifiers for both directions is provided. The term "subscriber facility NT" as used herein means that facility which carries out the part of the method according to the invention at the subscriber end. This is not the subscriber terminal, but a network termination at the subscriber end, possibly also a terminal with a built-in network termination(NT~ The distribution unit BONT
is the network termination of the broadband optical network.
The center HUB selects the subscriber-selected information from the television cable distribution network TVN, converts it into ATM cells if necessary, and combines it with those ATM cells into a common data stream which are intended for the connected subscribers. In the distribution unit BONT, only conversion between optical and electric signal takes place.
In the direction from the subscribers to the center, basically the same as in the direction from the center to the subscribers takes place. However, the traffic volume in the direction from the center to the subscribers is substantially greater than that in the opposite direction. This is indicated in Fig. 1 by the different sizes of the amplifiers shown in the coaxial cables. The capacity of the transmission equipment is also adapted to this. The cause is that the subscribers retrieve much more information than they feed into the network. Information providers must be connected to the network in another manner, mostly .
directly to the ATM network.
As regards control, however, the subscribers are equipped differently from the center. In particular, the distribution of the capacity is controlled by the center. This is done by signaling to the subscriber facilities from the center which time slots they may use in which channels. How this is accomplished in accordance with the invention will now be described with the aid of Fig. 2.
In the application underlying the invention, a data stream which has a superframe structure with 18 frames each consisting of two subframes is sent from the center to the subscribers. The first frame FR1 of these 18 frames with its two subframes is shown in the first line of Fig. 2. The structure of these frames is of no importance here; in any case, each frame contains seven ATM cells as payload. In this example, the first ATM cell ATMl of the first frame FR1 of each superframe is used for the assignment of capacity to the subscriber facilities by the center. This ATM cell ATMl is shown in greater detail in the second line of Fig. 2.
The ATM cell ATMl, like any ATM cell, has a header and a subsequent payload. The payload is divided here into 12 fields containing 4 bytes each. Each of these fields, such as field F3, is suited for assigning a time slot and the associated channel to a subscriber facility. Due to the very widely differing capacities of the two directions, a total of only just under 8 - - -ATM cells are sent by the subscriber facilities during the time that the center sends an entire superframe.
(The transmission speeds of the two directions do not have an integral relationship to each other and are not synchronized). Such an ATM cell ATM1 must therefore contain the assignments for usually 8 ATM
cells of the opposite direction; because of the nonintegral relationship, sometimes only 7 assignments are necessary.
In the present example, there is only a very broadband channel from the center to the subscribers. In this channel, the assignment can be made for all channels of the opposite direction in the respective first cell of a superframe. For various reasons, attempts will be made to assign all time slots even if not so many requests have been received. Then, the subscriber facilities to which these time slots are assigned will send respective empty cells. Therefore, the number of assignment fields needed does not change with the traffic volume. By contrast, the number of assignment fields needed is influenced by the number of channels in the opposite direction for which time slots were assigned. In the present example, however, the superframe length is freely selectable and was chosen so that the above-described conditions resulted. The same result would be obtained if not just one ATM cell were used per superframe or if not exactly 8 of 12 fields of these ATM cells were used for the time slot assignment. It is also possible to permanently assign part of the time slots or the time slots for part of the subscriber facilities in advance for at least a glven tlme.
An assignment field, the field F3, is shown in the third line of Fig. 2. It consists of three subfields, namely one for channel allocation, CA, one for subscriber identification, UID, and one for time-slot assignment, TSA. Thus, a unique assignment is possible for each time slot of all channels from the subscribers to the center.
The subscriber facilities to be used in accordance with the invention must be capable of changing the channel from one time slot to the next. This, however, is no problem in principle.
The invention does not touch the questions as to how synchronization is achieved between the various subscriber facilities, how the link is installed, and how the time slots are requested and precisely determined. These are questions which, like many others, also arise with many other solutions and which have been solved in principle. For requesting time slots, for example, a solution that suggests itself is to do this together with the normal useful-signal transmission in the respective assigned time slot of the allocated channel. Instead of requesting the respective time slots, a fixed capacity may be agreed upon, from which the center then determines the current requirements of the subscribers concerned.
In all systems with multiple access to a common medium, the question arises how to control the access to this medium. In radio transmission over the medium "airwaves", for example, the medium is apportioned by international agreements and frequency allocations based thereon. For some other media, too, such as fiber-optic and coaxial-cable networks, fixed allocations have been made. However, at least part of the total capacity must be assigned on demand.
For such cases, it is common practice to assign time slots for the duration of one call. For a variable traffic volume or for a constant traffic volume in an asynchronous environment, it is also common practice to assign to each call a channel within which the respective time slots to be used are then determined by some kind of mechanism.
In assigning a channel to a call, the respective parameters of the calls already assigned to this channel have to be taken into account. It may be necessary to first switch other calls to another channel before a channel has sufficient residual capacity for the new call. Still, an at least short-time bottleneck may occur in a channel due to variations in the traffic volume of the individual calls, while at other times, the same channel is only little loaded.
The object of the invention is to manage the capacity of the channels more effectively.
According to the invention, this object is attained by a method according to the teaching of claim 1, a system according to the teaching of claim 2, a center according to the teaching of claim 3, and a subscriber facility according to the teaching of claim 4.
Thus, all time slots in all channels are used as a common pool. Each time slot is assigned together with a channel allocation.
Further advantageous features of the invention are defined in the subclaims and will become apparent from the following description.
The invention will now be explained in more detail with reference to the accompanying drawings, in which:
Fig. 1 shows a major access system for cable television and ATM comprising systems, centers, and subscriber facilities according to the invention for carrying out the method according to the invention; and Fig. 2 shows a frame structure for carrying out the method according to the invention.
First, the environment in which the method according to the invention is used will be described with the aid of Fig. 1.
The starting point is a television cable distribution network TVN with a head end TVHE. At least part of the subscribers connected to this network are to be additionally connected to an ATM network ATM. The ATM
network ATM is shown here by three interconnected exchanges and a database.
To connect subscribers to both the cable distribution network and the ATM network, a center according to the invention is provided, which is designated here as HUB, a term commonly used for such a center by experts. To connect subscriber facilities NT to the two networks, a hybrid network is shown in this example. From the center HUB to a distribution unit BONT, an optical fiber is used. From the distribution unit BONT to the subscriber facility NT, a network of . .
branching coaxial cables containing amplifiers for both directions is provided. The term "subscriber facility NT" as used herein means that facility which carries out the part of the method according to the invention at the subscriber end. This is not the subscriber terminal, but a network termination at the subscriber end, possibly also a terminal with a built-in network termination(NT~ The distribution unit BONT
is the network termination of the broadband optical network.
The center HUB selects the subscriber-selected information from the television cable distribution network TVN, converts it into ATM cells if necessary, and combines it with those ATM cells into a common data stream which are intended for the connected subscribers. In the distribution unit BONT, only conversion between optical and electric signal takes place.
In the direction from the subscribers to the center, basically the same as in the direction from the center to the subscribers takes place. However, the traffic volume in the direction from the center to the subscribers is substantially greater than that in the opposite direction. This is indicated in Fig. 1 by the different sizes of the amplifiers shown in the coaxial cables. The capacity of the transmission equipment is also adapted to this. The cause is that the subscribers retrieve much more information than they feed into the network. Information providers must be connected to the network in another manner, mostly .
directly to the ATM network.
As regards control, however, the subscribers are equipped differently from the center. In particular, the distribution of the capacity is controlled by the center. This is done by signaling to the subscriber facilities from the center which time slots they may use in which channels. How this is accomplished in accordance with the invention will now be described with the aid of Fig. 2.
In the application underlying the invention, a data stream which has a superframe structure with 18 frames each consisting of two subframes is sent from the center to the subscribers. The first frame FR1 of these 18 frames with its two subframes is shown in the first line of Fig. 2. The structure of these frames is of no importance here; in any case, each frame contains seven ATM cells as payload. In this example, the first ATM cell ATMl of the first frame FR1 of each superframe is used for the assignment of capacity to the subscriber facilities by the center. This ATM cell ATMl is shown in greater detail in the second line of Fig. 2.
The ATM cell ATMl, like any ATM cell, has a header and a subsequent payload. The payload is divided here into 12 fields containing 4 bytes each. Each of these fields, such as field F3, is suited for assigning a time slot and the associated channel to a subscriber facility. Due to the very widely differing capacities of the two directions, a total of only just under 8 - - -ATM cells are sent by the subscriber facilities during the time that the center sends an entire superframe.
(The transmission speeds of the two directions do not have an integral relationship to each other and are not synchronized). Such an ATM cell ATM1 must therefore contain the assignments for usually 8 ATM
cells of the opposite direction; because of the nonintegral relationship, sometimes only 7 assignments are necessary.
In the present example, there is only a very broadband channel from the center to the subscribers. In this channel, the assignment can be made for all channels of the opposite direction in the respective first cell of a superframe. For various reasons, attempts will be made to assign all time slots even if not so many requests have been received. Then, the subscriber facilities to which these time slots are assigned will send respective empty cells. Therefore, the number of assignment fields needed does not change with the traffic volume. By contrast, the number of assignment fields needed is influenced by the number of channels in the opposite direction for which time slots were assigned. In the present example, however, the superframe length is freely selectable and was chosen so that the above-described conditions resulted. The same result would be obtained if not just one ATM cell were used per superframe or if not exactly 8 of 12 fields of these ATM cells were used for the time slot assignment. It is also possible to permanently assign part of the time slots or the time slots for part of the subscriber facilities in advance for at least a glven tlme.
An assignment field, the field F3, is shown in the third line of Fig. 2. It consists of three subfields, namely one for channel allocation, CA, one for subscriber identification, UID, and one for time-slot assignment, TSA. Thus, a unique assignment is possible for each time slot of all channels from the subscribers to the center.
The subscriber facilities to be used in accordance with the invention must be capable of changing the channel from one time slot to the next. This, however, is no problem in principle.
The invention does not touch the questions as to how synchronization is achieved between the various subscriber facilities, how the link is installed, and how the time slots are requested and precisely determined. These are questions which, like many others, also arise with many other solutions and which have been solved in principle. For requesting time slots, for example, a solution that suggests itself is to do this together with the normal useful-signal transmission in the respective assigned time slot of the allocated channel. Instead of requesting the respective time slots, a fixed capacity may be agreed upon, from which the center then determines the current requirements of the subscribers concerned.
Claims (6)
1. A method of assigning time slots in a system comprising a plurality of subscriber facilities (NT) connected to a center (HUB) via a common medium, the common medium being divided into a plurality of frequency or wavelength channels which are subdivided into time slots, characterized in that the center assigns time slots to at least part of the subscriber facilities by specifying one channel (CA) and one time-slot number (TSA) for each assigned time slot, that after each time slot used, each subscriber facility involved changes to the next assigned channel, and that each subscriber facility involved sends information in the time slot with the next assigned time-slot number.
2. A system comprising a plurality of subscriber facilities (NT) connected to a center (HUB) via a common medium, the common medium being divided into a plurality of frequency or wavelength channels which are subdivided into time slots, characterized in that the center comprises means for assigning time slots to the subscriber facilities by specifying one channel and one time-slot number for each assigned time slot, and that at least part of the subscriber facilities comprise means for changing to the next assigned channel after each time slot used and for sending information in the time slot with the next assigned time-slot number.
3. A center (HUB) for a system comprising a plurality of subscriber facilities (NT) connected to the center via a common medium, the common medium being divided into a plurality of frequency or wavelength channels which are subdivided into time slots, characterized in that the center comprises means for assigning time slots to the subscriber facilities by specifying one channel (CA) and one time-slot number (TSA) for each assigned time slot.
4. A subscriber facility (NT) for a system comprising a plurality of subscriber facilities (NT) connected to a center (HUB) via a common medium, the common medium being divided into a plurality of frequency or wavelength channels which are subdivided into time slots, characterized in that the subscriber facility comprises means for changing to the next assigned channel (CA) after each time slot used and for sending information in the time slot with the next assigned time-slot number (TSA).
5. A method as claimed in claim 1, characterized in that if required, a given number of time slots is requested from the center by at least part of the subscribers via the associated subscriber facility.
6. A method as claimed in claim 1, characterized in that at least part of the subscribers are assigned a fixed capacity, and that the center determines therefrom the current requirement of the subscribers concerned.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19730623A DE19730623A1 (en) | 1997-07-17 | 1997-07-17 | Method for allocating time slots, as well as system, center and subscriber facility for performing this method |
| DE19730623.3 | 1997-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2240766A1 true CA2240766A1 (en) | 1999-01-17 |
Family
ID=7835983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002240766A Abandoned CA2240766A1 (en) | 1997-07-17 | 1998-07-16 | Method of assigning time slots, as well as system, center, and subscriber facility for carrying out this method |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6522657B1 (en) |
| EP (1) | EP0892580B1 (en) |
| JP (1) | JPH11103284A (en) |
| CN (1) | CN1190028C (en) |
| AU (1) | AU7511198A (en) |
| CA (1) | CA2240766A1 (en) |
| DE (2) | DE19730623A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI109861B (en) * | 1998-01-05 | 2002-10-15 | Nokia Corp | A method for efficiently utilizing cell broadcasting capacity |
| EP1197695A3 (en) * | 2000-10-13 | 2003-04-16 | Honda Giken Kogyo Kabushiki Kaisha | Spool valve |
| KR100816256B1 (en) * | 2006-10-30 | 2008-03-21 | 에스케이 텔레콤주식회사 | Method and apparatus for allocating time-slot in time division duplex system |
| CN105933092B (en) * | 2016-06-14 | 2020-04-07 | Tcl移动通信科技（宁波）有限公司 | Data transmission method and system based on circuit switching |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204093A (en) * | 1978-05-19 | 1980-05-20 | Bell Telephone Laboratories, Incorporated | Variable frame rate technique for use in a time-division multiple access (TDMA) communication system |
| US4809270A (en) * | 1984-12-21 | 1989-02-28 | AT&T Information Systems Inc. American Telephone and Telegraph Company | Variable time slot communication system |
| DE3515127A1 (en) * | 1985-04-26 | 1986-10-30 | Rafi Gmbh & Co Elektrotechnische Spezialfabrik, 7981 Berg | NETWORKED MULTIPLE ACCESS DEVICE |
| JPH0754933B2 (en) * | 1986-08-14 | 1995-06-07 | 日本電気株式会社 | Circuit switching method and device in packet network |
| IL97284A (en) * | 1990-02-27 | 1994-06-24 | Motorola Inc | Method and apparatus for shared-carrier frequency-hopping |
| DE59008974D1 (en) * | 1990-03-12 | 1995-06-01 | Siemens Ag | Flexible multiplex system. |
| SE9200607D0 (en) * | 1992-02-28 | 1992-02-28 | Ericsson Telefon Ab L M | COMMUNICATION METHODS AND MEAN IN A TDMA CELLULAR MOBILE RADIO SYSTEM |
| DE4335480C2 (en) * | 1992-11-02 | 1996-07-11 | Motorola Inc | Method for removing frequency assignments in a frequency hopping communication system and device for carrying out the method |
| AU701959B2 (en) | 1994-03-29 | 1999-02-11 | British Telecommunications Public Limited Company | Optical telecommunications network |
| EP0691760B1 (en) | 1994-07-07 | 2006-06-14 | Marconi UK Intellectual Property Ltd | Multiplexing in a Passive Optical Network (PON) |
| DE4425973C1 (en) * | 1994-07-21 | 1995-04-20 | Grundig Emv | Method for adaptively determining the transmission capacity of a transmission channel |
| FI114178B (en) * | 1995-01-09 | 2004-08-31 | Nokia Corp | Dynamic allocation of radio capacity in a TDMA system |
| US5572517A (en) * | 1995-02-28 | 1996-11-05 | General Instrument Corporation | Configurable hybrid medium access control for cable metropolitan area networks |
| US5638374A (en) * | 1995-03-15 | 1997-06-10 | Hughes Electronics | Enhanced transaction reservation |
| EP0758822B1 (en) | 1995-08-11 | 2006-03-01 | Alcatel | Method and arrangement for dynamic allocation of bandwidth in a TDM/TDMA network |
| GB2306083B (en) * | 1995-10-06 | 1998-01-28 | Nippon Telegraph & Telephone | TDMA communication system |
| US5949769A (en) * | 1995-10-10 | 1999-09-07 | Sicom, Inc. | Multirate local multipoint data distribution system |
| FI99186C (en) | 1995-11-07 | 1997-10-10 | Nokia Oy Ab | Uplink access method in a two-way communication system |
| US6055242A (en) * | 1996-03-20 | 2000-04-25 | Lucent Technologies Inc. | Method and apparatus enabling synchronous transfer mode, variable length and packet mode access for multiple services over a broadband communication network |
| US6011786A (en) * | 1997-06-06 | 2000-01-04 | Ericsson Inc. | Systems and methods for control channel communication in cellular radiotelephone systems |
| US6094429A (en) * | 1998-03-02 | 2000-07-25 | Motorola, Inc. | Method for accessing and providing access to a packet channel |
-
1997
- 1997-07-17 DE DE19730623A patent/DE19730623A1/en not_active Withdrawn
-
1998
- 1998-07-10 AU AU75111/98A patent/AU7511198A/en not_active Abandoned
- 1998-07-15 US US09/115,989 patent/US6522657B1/en not_active Expired - Lifetime
- 1998-07-16 CA CA002240766A patent/CA2240766A1/en not_active Abandoned
- 1998-07-16 EP EP98440153A patent/EP0892580B1/en not_active Expired - Lifetime
- 1998-07-16 DE DE59813091T patent/DE59813091D1/en not_active Expired - Lifetime
- 1998-07-16 CN CNB981160808A patent/CN1190028C/en not_active Expired - Lifetime
- 1998-07-16 JP JP20237198A patent/JPH11103284A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU7511198A (en) | 1999-01-28 |
| US6522657B1 (en) | 2003-02-18 |
| CN1206262A (en) | 1999-01-27 |
| EP0892580A3 (en) | 2000-09-27 |
| CN1190028C (en) | 2005-02-16 |
| DE59813091D1 (en) | 2006-02-16 |
| EP0892580A2 (en) | 1999-01-20 |
| EP0892580B1 (en) | 2005-10-05 |
| DE19730623A1 (en) | 1999-01-21 |
| JPH11103284A (en) | 1999-04-13 |
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| Date | Code | Title | Description |
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| FZDE | Discontinued |