WO1995019071B1 - Tdma communication system - Google Patents

Tdma communication system

Info

Publication number
WO1995019071B1
WO1995019071B1 PCT/IB1995/000009 IB9500009W WO9519071B1 WO 1995019071 B1 WO1995019071 B1 WO 1995019071B1 IB 9500009 W IB9500009 W IB 9500009W WO 9519071 B1 WO9519071 B1 WO 9519071B1
Authority
WO
WIPO (PCT)
Prior art keywords
time slot
transmission
full time
full
tdma
Prior art date
Application number
PCT/IB1995/000009
Other languages
French (fr)
Other versions
WO1995019071A1 (en
Filing date
Publication date
Priority claimed from GB9400253A external-priority patent/GB9400253D0/en
Application filed filed Critical
Priority to JP51839895A priority Critical patent/JP3533221B2/en
Priority to DE69524996T priority patent/DE69524996T2/en
Priority to EP95903447A priority patent/EP0691053B1/en
Publication of WO1995019071A1 publication Critical patent/WO1995019071A1/en
Publication of WO1995019071B1 publication Critical patent/WO1995019071B1/en

Links

Abstract

A multi-slot TDMA communications system, such as DECT, has provision for allocating full time slots and double time slots to calls. However, whereas full time slot calls are normally assigned to what a subscriber unit or base station has determined as the best time slot, a double time slot call is constrained by having to start with an even numbered time slot in a frame. This can lead to an inferior grade of service for double time slot calls because during call set up, although there may be free full time slots, they are not always arranged as pairs with the first time slot being even numbered. A modified slot selection algorithm is proposed in which whenever possible a full time slot call is assigned to an acceptable inactive time slot located adjacent to an active full time slot in a frame, even though this may mean that it is not the best inactive time slot.

Claims

AMENDED CLAIMS, [received by the International Bureau on 17 July 1995 (17.07.95);* new claims 1 and 2 added; original claims 1-4 renumbered as claims 3-6 (2 pages)]
1. A time division multiple access (TDMA) system comprising a plurality of transceiving units operating in accordance with a transmission framing structure having provision for time slots of at least two different predetermined durations, a longer one of said at least two durations being a multiple of a shorter one of said at least two durations,
5 characterized in that the system operates in accordance with a protocol in which for a transceiving unit wanting to make a transmission requiring a shorter time slot preference is given to a shorter time slot of an acceptable quality which is adjacent to a shorter time slot already involved in a transmission.
2. A TDMA system as claimed in claim 1, characterized in that said multiple 10 is 2 and in that preference is given to a shorter duration time slot which when taken together with the shorter duration time slot already involved in a transmission constitutes a complete longer duration time slot within the framing structure.
3. A time division multiple access (TDMA) communication system comprising a plurality of subscriber units, each unit comprising radio transceiving means and
15 control means, the control means including means responsive to a request to initiate a call for scanning duplex voice channels comprising complementary time slots in a TDMA frame; means for determining the quality of at least each inactive time slot and forming a channel map, and means for selecting for a full time slot transmission an inactive full time slot of an acceptable quality which is located adjacent to an active full time slot in me frame.
20 4. A system as claimed in claim 3, wherein the time slots in a frame are numbered in an ascending order, characterized in that said selecting means selects an acceptable higher odd number inactive full time slot adjacent an active even numbered full time slot.
5. A subscriber unit for use in a time division multiple access (TDMA)
25 communication system, comprising radio transceiving means, control means, means for determining the quality of a TDMA physical channel and a channel map store, wherein the control means in response to a call request for a full time slot transmission has means for determining which of the inactive physical channels in the channel map store is of an acceptable quality and means for initiating a transmission in an in active full time slot
30 channel of an acceptable quality located adjacent a full time slot active channel.
AMENDED SHEET (ARTICLE 19}
6. A subscriber unit as claimed in claim 5, wherein the full time slots in a
TDMA frame are sequentially numbered in ascending order, characterized in that the control means initiates the transmission in the acceptable higher odd numbered inactive full time slot adjacent an active even numbered full time slot.
PCT/IB1995/000009 1994-01-07 1995-01-04 Tdma communication system WO1995019071A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP51839895A JP3533221B2 (en) 1994-01-07 1995-01-04 TDMA communication system
DE69524996T DE69524996T2 (en) 1994-01-07 1995-01-04 TDMA communication system
EP95903447A EP0691053B1 (en) 1994-01-07 1995-01-04 Tdma communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9400253A GB9400253D0 (en) 1994-01-07 1994-01-07 TDMA communications system
GB9400253.2 1994-01-07

Publications (2)

Publication Number Publication Date
WO1995019071A1 WO1995019071A1 (en) 1995-07-13
WO1995019071B1 true WO1995019071B1 (en) 1995-08-17

Family

ID=10748512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1995/000009 WO1995019071A1 (en) 1994-01-07 1995-01-04 Tdma communication system

Country Status (7)

Country Link
US (1) US5809015A (en)
EP (1) EP0691053B1 (en)
JP (1) JP3533221B2 (en)
KR (1) KR100390106B1 (en)
DE (1) DE69524996T2 (en)
GB (1) GB9400253D0 (en)
WO (1) WO1995019071A1 (en)

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DE19635327C1 (en) * 1996-08-30 1997-10-09 Siemens Ag Time slot usage method esp. for wireless communications network
JPH10190859A (en) * 1996-12-20 1998-07-21 Nec Corp Radio communication system
US6633550B1 (en) * 1997-02-20 2003-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Radio transceiver on a chip
US6212205B1 (en) * 1997-02-25 2001-04-03 Vlsi Technology, Inc. Methods of generating a data stream, methods of validating an integrated circuit, and methods of communicating a data stream
FI104135B1 (en) * 1997-06-24 1999-11-15 Nokia Mobile Phones Ltd Time division multiple access radio systems
EP1555771B1 (en) * 1998-03-31 2010-10-13 Sony Deutschland GmbH Method and means for allocating time slots in a TDD system
DE19823683B4 (en) * 1998-05-27 2004-05-06 Siemens Ag Method for transmitting information indicating the transmission capacity from a central to at least one decentralized device via a radio link
DE19848259B4 (en) * 1998-10-20 2010-12-09 Gigaset Communications Gmbh Method for reserving double time slots in a radio link connecting a central device and decentralized devices
US6539007B1 (en) * 1998-11-16 2003-03-25 Samsung Electronics Co., Ltd. System and method for multiple single-phase access in a TDMA wireless network
DE19925262A1 (en) * 1999-06-01 2001-01-25 Siemens Ag Modem data transmission method for TDMA radio system
GB2356528A (en) * 1999-11-17 2001-05-23 Ericsson Telefon Ab L M Channel allocation in telecommunication networks
US7173921B1 (en) 2000-10-11 2007-02-06 Aperto Networks, Inc. Protocol for allocating upstream slots over a link in a point-to-multipoint communication system
GB2368499B (en) * 2000-10-26 2004-06-30 Matsushita Comm Ind Uk Ltd Mobile communications
US6904489B2 (en) * 2001-10-23 2005-06-07 Digi International Inc. Methods and systems for remotely accessing universal serial bus devices
KR100429513B1 (en) * 2001-12-12 2004-05-03 삼성전자주식회사 Service switching method based on quality of service in a mobile telecommunication system
CN100558068C (en) * 2006-12-19 2009-11-04 华为技术有限公司 A kind of superframe managing method
US7957418B2 (en) * 2007-07-31 2011-06-07 Research In Motion Limited Data burst communication techniques for use in increasing data throughput to mobile communication devices
US9231693B2 (en) 2013-07-19 2016-01-05 Motorola Solutions, Inc. Full duplex individual call via linked single frequency repeaters
US9232522B2 (en) 2013-07-19 2016-01-05 Motorola Solutions, Inc. Full duplex direct mode individual and group calling using adjacent time slots in a TDMA system
FR3078468A1 (en) * 2018-02-28 2019-08-30 Orange METHOD OF SUSPENDING A BASE STATION, COMPUTER PROGRAM PRODUCT, DEVICE, CORRESPONDING BASE STATION AND SIGNAL.

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GB2232326A (en) * 1989-05-26 1990-12-05 Philips Electronic Associated Data transmission over a tdm duplex frequency channel
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