GB2336508B - Carrier activation for data communications - Google Patents

Carrier activation for data communications

Info

Publication number
GB2336508B
GB2336508B GB9904575A GB9904575A GB2336508B GB 2336508 B GB2336508 B GB 2336508B GB 9904575 A GB9904575 A GB 9904575A GB 9904575 A GB9904575 A GB 9904575A GB 2336508 B GB2336508 B GB 2336508B
Authority
GB
United Kingdom
Prior art keywords
carrier
transmitted
switched
data
transmission
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 - Fee Related
Application number
GB9904575A
Other versions
GB2336508A8 (en
GB9904575D0 (en
GB2336508A (en
Inventor
Howard Ray Feldman
Siu Wah Wong
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.)
International Mobile Satellite Organization
Inmarsat Global Ltd
Original Assignee
International Mobile Satellite Organization
Inmarsat Ltd
Inmarsat Two Co
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
Priority claimed from GB9804640A external-priority patent/GB2335827B/en
Priority claimed from GB9804639A external-priority patent/GB2335828B/en
Application filed by International Mobile Satellite Organization, Inmarsat Ltd, Inmarsat Two Co filed Critical International Mobile Satellite Organization
Priority to GB9904575A priority Critical patent/GB2336508B/en
Publication of GB9904575D0 publication Critical patent/GB9904575D0/en
Publication of GB2336508A publication Critical patent/GB2336508A/en
Publication of GB2336508A8 publication Critical patent/GB2336508A8/en
Application granted granted Critical
Publication of GB2336508B publication Critical patent/GB2336508B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
    • 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
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H04W52/0232—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal according to average transmission signal activity
    • 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

Abstract

In a radio communications system in which data is transmitted on a modulated radio frequency carrier, the carrier is switched off when no data is available for transmission. If repeated signalling information is required to be transmitted, only a predetermined number of repeats are transmitted before the carrier is switched off. In one embodiment a bit sequence at the end of a first data block is compared with multiple sequences from a second block and if all sequences are equal, transmission of the second block is inhibited. In another embodiment data input for transmission is compared with a predetermined bit sequence. If a match is found for any relative bit alignment, this indicates an idle state (absence of user data) and the carrier is switched off. When more user data is received the carrier is switched on and frames are transmitted in synchronisation with the timing of frames transmitted before carrier deactivation. After carrier reactivation a constant power preamble may be transmitted to assist in level control in the transmitter. In a satellite SCPC system satellite power efficiency is improved and mobile earth station battery power is saved.
GB9904575A 1998-03-04 1999-02-26 Carrier activation for data communications Expired - Fee Related GB2336508B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9904575A GB2336508B (en) 1998-03-04 1999-02-26 Carrier activation for data communications

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9804640A GB2335827B (en) 1998-03-04 1998-03-04 Data communication method and apparatus
GB9804639A GB2335828B (en) 1998-03-04 1998-03-04 Satellite Communications System
GB9904575A GB2336508B (en) 1998-03-04 1999-02-26 Carrier activation for data communications

Publications (4)

Publication Number Publication Date
GB9904575D0 GB9904575D0 (en) 1999-04-21
GB2336508A GB2336508A (en) 1999-10-20
GB2336508A8 GB2336508A8 (en) 1999-12-07
GB2336508B true GB2336508B (en) 2003-05-28

Family

ID=27269228

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9904575A Expired - Fee Related GB2336508B (en) 1998-03-04 1999-02-26 Carrier activation for data communications

Country Status (1)

Country Link
GB (1) GB2336508B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957078B1 (en) * 2000-06-21 2005-10-18 Northrop Grumman Corporation Gated power for a satellite hopped downlink with multiple payloads per frame
US7068974B1 (en) * 2000-06-21 2006-06-27 Northrop Grumman Corporation Beam hopping self addressed packet switched communication system with power gating
US6992992B1 (en) 2000-06-21 2006-01-31 Northrop Grumman Corporation Downlink beam hopping waveform

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5239557A (en) * 1992-04-10 1993-08-24 Ericsson/Ge Mobile Communications Discountinuous CDMA reception

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5239557A (en) * 1992-04-10 1993-08-24 Ericsson/Ge Mobile Communications Discountinuous CDMA reception

Also Published As

Publication number Publication date
GB2336508A8 (en) 1999-12-07
GB9904575D0 (en) 1999-04-21
GB2336508A (en) 1999-10-20

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Legal Events

Date Code Title Description
COOA Change in applicant's name or ownership of the application
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110226