GB1502255A - Network radio systems - Google Patents
Network radio systemsInfo
- Publication number
- GB1502255A GB1502255A GB43079/71A GB4307971A GB1502255A GB 1502255 A GB1502255 A GB 1502255A GB 43079/71 A GB43079/71 A GB 43079/71A GB 4307971 A GB4307971 A GB 4307971A GB 1502255 A GB1502255 A GB 1502255A
- Authority
- GB
- United Kingdom
- Prior art keywords
- station
- stations
- signal
- relay
- transmitter
- 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.)
- Expired
Links
- 239000003550 marker Substances 0.000 abstract 5
- 238000000034 method Methods 0.000 abstract 3
- 230000000694 effects Effects 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000006467 substitution reaction Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
1502255 Relaying SIEMENS AG 15 Sept 1971 [30 Dec 1970] 43079/71 Heading H4L A network radio system employs a number of transmitter/receiver stations each constructed to compare a call sign contained in a received signal with its own call sign and, if non-coincidence is detected, to relay the received signal in modified form or, if coincidence is detected, to effect the connection back to the original calling station via any relay stations used in the search procedure. The stations, which operate on the frequencyhopping technique, each have the basic form illustrated in Fig. 2. An antenna 31, which may be omni-directional or a combination of several differently-oriented directional antennae, is selectively connected via a switch 21 to a receiver 22 or transmitter 23. Output from receiver 22 is recorded in a store 24 and from here can be fed to the transmitter 23. A PBX telephone exchange with separate lines and a distribution cabinet can be connected at respective terminals 29, 30. In this case, and where the station is to act purely as a relay, an intermediate store 32 can be provided to record the receiver output and supply the transmitter input with a modulating signal. In operation (Fig. 3). in which each station has the basic construction described, station 317 wishes to communicate with station 331. Each station in the network has its characteristic frequencyhopping sequence, while a further sequence is reserved as a common channel to establish connections between stations, and other purposes. The origin station 317 transmits a call signal which embodies a starting pulse, representing a time datum, and two marker pulses (Fig. 4, not shown). One of the latter identifies the origin station as station 317, while the other identifies the destination station as station 331. Stations not transmitting at this time are switched to receive and effect the frequency-hopping sequence of the common channel. Thus, for instance, two such stations 311, 322 receive the call signal from station 317 and record it. During the next hopping interval, each of these stations 311, 322 relays the signal in modified form. The modification involves substitution of the origin station marker 317 by the relay station marker 311, 322 respectively. The destination station marker 331 and starting pulse remain unaltered. The signals transmitted from stations 311, 322 are, for instance, received by stations 328 and 331. The former, not recognizing the marker 331, relays the signal, as already described for stations 311, 322, to a further station 328 and so on. However, station 331 recognizes that it is the destination station. It receives, almost simultaneously, the two signals from stations 311, 322 which differ only by their respective markers. Based on some suitable criterion (alternative criteria are described), station 331 selects one of the two stations 311, 322 to use in developing the link to the origin station 317. Station 331 then transmits a signal which causes other stations (such as 323) to cease relay operations; subsequently, station 331 sets itself to its own frequency-hopping sequence, and via any station(s)-in this example, the selected one of stations 311, 322-which was used in the search procedure, becomes synchronized with station 317 (which sets itself to the frequency-hopping sequence of station 322) and message reception commences. Each time the speech button at one or other end station 317, 331 is released, the link is reset for transmission in the reverse direction, via the relay station(s). Enciphering may be used. The link can be broken if one station sends a disconnect signal which renders the transmitter of the destination station inoperative and switches its receiver to the service channel.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2064352A DE2064352C1 (en) | 1970-12-30 | 1970-12-30 | Radio system with a large number of spatially distributed transceiver stations |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1502255A true GB1502255A (en) | 1978-03-01 |
Family
ID=5792507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB43079/71A Expired GB1502255A (en) | 1970-12-30 | 1971-09-15 | Network radio systems |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE777282A (en) |
CA (1) | CA1029812A (en) |
DE (1) | DE2064352C1 (en) |
DK (1) | DK614171A (en) |
FR (1) | FR2372565A1 (en) |
GB (1) | GB1502255A (en) |
IT (1) | IT1019520B (en) |
NL (1) | NL156885B (en) |
NO (1) | NO113564C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0091142A2 (en) * | 1982-04-07 | 1983-10-12 | Motorola Israel Limited | Signal processing unit |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3130192A1 (en) * | 1981-07-30 | 1983-02-17 | Siemens AG, 1000 Berlin und 8000 München | Centrally controlled stochastic multiple access method for dynamic terminal configurations, in particular for mobile communication systems |
JP2549928B2 (en) * | 1989-11-28 | 1996-10-30 | 日本電信電話株式会社 | Incoming control channel selection method |
-
1970
- 1970-12-30 DE DE2064352A patent/DE2064352C1/en not_active Expired
-
1971
- 1971-09-15 GB GB43079/71A patent/GB1502255A/en not_active Expired
- 1971-11-02 NL NL7115044.A patent/NL156885B/en unknown
- 1971-12-16 DK DK614171A patent/DK614171A/en not_active Application Discontinuation
- 1971-12-22 IT IT32829/71A patent/IT1019520B/en active
- 1971-12-22 NO NO4792/71A patent/NO113564C/en unknown
- 1971-12-24 BE BE112178A patent/BE777282A/fr unknown
- 1971-12-29 CA CA131,182A patent/CA1029812A/en not_active Expired
- 1971-12-30 FR FR7147660A patent/FR2372565A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0091142A2 (en) * | 1982-04-07 | 1983-10-12 | Motorola Israel Limited | Signal processing unit |
EP0091142A3 (en) * | 1982-04-07 | 1984-03-28 | Motorola Israel Limited | Signal processing unit |
Also Published As
Publication number | Publication date |
---|---|
NO113564C (en) | 1977-03-02 |
NL156885B (en) | 1978-05-16 |
IT1019520B (en) | 1977-11-30 |
CA1029812A (en) | 1978-04-18 |
FR2372565A1 (en) | 1978-06-23 |
NL7115044A (en) | 1978-01-31 |
DE2064352C1 (en) | 1978-04-27 |
BE777282A (en) | 1972-01-14 |
DK614171A (en) | 1977-10-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |