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WO1999039460A1 - Tdma - Google Patents

Tdma Download PDF

Info

Publication number
WO1999039460A1
WO1999039460A1 PCT/SE1999/000101 SE9900101W WO9939460A1 WO 1999039460 A1 WO1999039460 A1 WO 1999039460A1 SE 9900101 W SE9900101 W SE 9900101W WO 9939460 A1 WO9939460 A1 WO 9939460A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
measurement
frames
multiframe
measurement frame
Prior art date
Application number
PCT/SE1999/000101
Other languages
English (en)
Inventor
Per-Erik ÖSTLING
Original Assignee
Radio Design Innovation Tj Ab
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 Radio Design Innovation Tj Ab filed Critical Radio Design Innovation Tj Ab
Priority to AU25551/99A priority Critical patent/AU2555199A/en
Publication of WO1999039460A1 publication Critical patent/WO1999039460A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values

Definitions

  • the present invention relates to a method for transmitting information between telecommunication devices using multiframe TDMA.
  • Time division multiple access is a multiple access method used to distinguish signals from different users in digital wireless systems.
  • a number of users share the same transmitter/receiver (TRX) in the base station by transmitting in alternating slots in a frame, Figure 1.
  • TRX transmitter/receiver
  • Figure 1 discloses a conventional TDMA structure with N time slots per frame where each slot is allocated to a different user.
  • the frame structure in the uplink is delayed compared to the downlink (or vice versa) to prevent that the terminal is simultaneously transmitting and receiving in order to eliminate the need for duplex filters in the terminal. 2 2.1.1 Advantages with conventional TDMA
  • TDMA time division multiple access
  • TDMA time division multiple access
  • the object of the present invention is to overcome the above contra- diction and allow TDMA with only a few time slots per frame while still obtaining high capacity for measurements.
  • D4 IBM Technical Disclosure Bulletin, Vol. 39, No. 1, January 1996, page 353.
  • Dl discloses a system using multiframes, wherein at least two measurement periods are used during a multiframe.
  • D2 discloses a TDMA-system using multiframes.
  • D3 discloses a FDMA-system using multiframes which comprise a predetermined number of frames including at least on control frame.
  • D4 discloses slot rotation using pseudo random number generator in a TDMA- system for improving the carrier-to-interference ratio.
  • An advantage of the method in the present invention is that it alleviates the problem of poor possibilities of performing measurements at the terminal when the number of users per carrier is low (2 or a few more users per carrier). It also allows a terminal to make measurements of other frequencies in the time slots allocated to that user for transmission and reception. Another advantage is that the invention utilizes the main benefits of TDMA (no duplex filter in terminal and time for measurements by terminal) while maintaining minimum increase of channel bit rate and is most useful when there are only a few time slots per frame (i.e., 2-4 time slots).
  • TDMA no duplex filter in terminal and time for measurements by terminal
  • Figure 1 is a conventional TDMA structure with N users on the same carrier
  • Figure 2 is a multiframe TDMA structure according to the invention.
  • Figure 3 is an example of the multiframe TDMA structure according to Figure 2;
  • Figure 4 is an example of a measurement frame, the time slots of which can be used on different carriers;
  • Figure 5 discloses the general frequency hopping case for user i and user k
  • Figure 6 discloses a special case where users on the same carrier use the same measurement frame.
  • Figure 2 discloses a frame structure of the inventive multiframe TDMA scheme with M frames per multiframe. Of these frames are MA conventional frames and at least one measurement frame as described below.
  • the capacity for making measurements can readily be changed by altering the number of frames in the multiframe (at the cost of increased channel bit rate) or by changing the number of measurement frames in the multiframe.
  • the number of frames per multiframe may, or may not, vary between users. It may also change with time for a given user.
  • the terminal can make measurements during the idle slots in the frame.
  • the terminal can also steal conventional frames and make measurements in these frames. With the concept "steal”, we mean that terminals use conventional data frames for measurements.
  • Each conventional frame is constituted by Ntime slots with a possibility to allocate each slot to a different user, Figure 1.
  • the slots can be transmitted on the same carrier frequency or on different carrier frequencies.
  • the measurement frame is used by the terminal for reception of dummy 1 data or measurements.
  • the quantities being measured could be, for example, interference levels of other traffic channels or signal strengths of broadcast signals from other base stations. It should be realized that the duration of the measurement frame not necessarily has to be of the same duration as a conventional frame. The duration of the measurement frame may be a fraction of a conventional frame as well as longer (e.g., a multiple) than a conventional frame.
  • the multiframe structure is here defined per user basis. This also allows the multiframe approach to be used also in systems with frequency hopping where individual users have independent hopping sequences.
  • the position of the measurement frame in the multiframe may, or may not, vary between multiframes for a given user, independently of the positions of the measurement frames of the other users.
  • FIG. 3 discloses the particular frame structure for a TDMA scheme with two users (two time slots) per frame. The figure shows that the measurement frame is the only possibility to make measurements since a terminal will transmit in time slot 1 and receive in time slot 2, or vice versa.
  • the corresponding terminal can make measurements on an arbitrary carrier frequency in each time slot (or even on several frequencies during a slot) of the measurement frame independently of which frequencies other users allocated to the same measurement frame measure.
  • the terminal can measure on anyone of the carrier frequencies F ⁇ -Fj_ (indicated by an X).
  • One event that can occur in a system with measurement frames is that a user makes interference measurements on a channel allocated to another user which has its measurement frame simultaneously. Since that user will also be busy making measurements there will not be any traffic data conveyed to the terminal, and unless some other kind of signal is transmitted by the base station the first user will perceive this channel as non-interfered. Such an event is called a measurement collision.
  • Measurement collisions should be avoided since they may result in allocation of interfered channels. There are basically three methods two avoid or reduce the impact of measurement collisions: scheduling of measurement frame position,
  • dummy in this case refers to non-traffic data. In reality this could be some kind of control alternating measurement frame position, and transmission of dummy information by the base station during measurement frames. The best choice depends on the system configuration and especially whether the base station transmits dummy information or not during measurement frames. We will first describe the principles of these methods and present examples of their functions later.
  • Whether or not it is possible to completely avoid the measurement collisions when the base station does not transmit during measurement frames depends on the number of carrier frequencies L in the system and the number of measurement frames M.
  • the base station transmits dummy- or other information during idle frame: Another alternative which avoids measurement collisions and provides true measurements of interference levels is to have the base stations transmit dummy information during the idle frames. If the transmitter power of the dummy information is the same as the previous slot with true information, other terminals that make measurements of that frequency will not notice that the particular user on that frequency is making measurements.
  • the measurement frames and multiframes individually for each user. It is also possible to use a centrally controlled approach where a pre-determined subset transmit dummy information in the measurement frame. Such an approach can be useful, for example, if the measurement frame is shorter than a conventional frame and it takes several measurement frames until all users have transmitted dummy information.
  • Figure 5 discloses the general case (Frequency hopping case) where a user is not bound to a specific carrier (F ⁇ -Ff) and the position of the measurement frame in a multiframe and the length of the multiframe is individually defined for each user. During the measurement frames the terminals can measure on different carriers (F ⁇ - Fj as shown in Figure 4.
  • Figure 5 discloses the situation for user and user k, respectively, wherein the user's carrier frequency in its assigned slot in a frame is indicated by a bold lined square marked with the user's identity.
  • the measurement frames are marked by shadowed rectangles that span across the whole frequency band to indicate that the terminals can measure on any carrier frequency.
  • the figure emphasizes independent assignment of positions of measurement frames and lengths of multiframes for each user.
  • multiframe B for user t frame 2
  • user k has a measurement frame
  • user i is transmitting on carrier 4 in its assigned time slot.
  • multiframe B for user k frame M
  • user k is transmitting on carrier FT
  • User i in the same frame M ⁇ is measuring on arbitrary carriers in the rectangle. It should be realized that the length of a multiframe can change in time and can be different for different users.
  • Figure 6 discloses a special case, wherein users allocated to time slots on the same carrier are bound to use the same measurement frames.
  • the dashed squares indicate which users currently have their measurement frame, i.e., all users on the
  • the measurement frame is shared among MA conventional frames. If the duration of a measurement frame is ⁇ compared to a conventional frame an "equivalent frame" can be defined which consists of the conventional frame plus the fraction of the measurement frame that can be related to this conventional frame, i.e., the duration of that equivalent frame is l+ /(MA) frames. This is the factor by which the channel bit rate increases by the introduction of a measurement frame (not considering different coding, guard time, etc., that might have to be changed). Since each frame consists of N time slots this scheme can be said to correspond to a N' -slot TDMA system, where N' is denoted as equivalent number of slots per frame. This value can be calculated as
  • T MF (M- l + ⁇ )T F seconds
  • T ⁇ K/K m
  • T m K/K ⁇ (M- 1 + a)T v seconds
  • channels can be monitored within 7 ⁇ seconds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de transmission d'informations utilisant une multitrame TDMA. Les trames d'un système TDMA classique sont groupées en multitrames consistant en au moins une trame qui est utilisée pour des mesures ou la transmission de données autres que les données utilisateur.
PCT/SE1999/000101 1998-01-29 1999-01-26 Tdma WO1999039460A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU25551/99A AU2555199A (en) 1998-01-29 1999-01-26 Tdma

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9800250-4 1998-01-29
SE9800250A SE9800250L (sv) 1998-01-29 1998-01-29 Tdma

Publications (1)

Publication Number Publication Date
WO1999039460A1 true WO1999039460A1 (fr) 1999-08-05

Family

ID=20410019

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000101 WO1999039460A1 (fr) 1998-01-29 1999-01-26 Tdma

Country Status (3)

Country Link
AU (1) AU2555199A (fr)
SE (1) SE9800250L (fr)
WO (1) WO1999039460A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458768A1 (fr) * 1990-05-23 1991-11-27 Telefonaktiebolaget L M Ericsson Procédé pour déterminer la qualité d'une liaison dans un système de communication mobile
US5479410A (en) * 1992-11-30 1995-12-26 Nokia Telecommunications Oy Measuring signal strengths of adjacent base stations in a TDMA radio system for a possible handover
WO1996021998A2 (fr) * 1995-01-04 1996-07-18 Nokia Telecommunications Oy Systeme radio pour interface de ligne d'abonne sans fil
US5617412A (en) * 1994-04-15 1997-04-01 Alcatel N.V. Frame/multiframe structure FDMA system and corresponding signal
WO1997015169A1 (fr) * 1995-10-18 1997-04-24 Telefonaktiebolaget Lm Ericsson Dispositifs et procedes pour mesurer l'intensite d'un signal dans un systeme de radiocommunication
WO1998017021A2 (fr) * 1996-10-15 1998-04-23 Telefonaktiebolaget Lm Ericsson (Publ) Appareils et procedes destines a mesurer l'intensite d'un signal dans un systeme de communication sans fil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458768A1 (fr) * 1990-05-23 1991-11-27 Telefonaktiebolaget L M Ericsson Procédé pour déterminer la qualité d'une liaison dans un système de communication mobile
US5479410A (en) * 1992-11-30 1995-12-26 Nokia Telecommunications Oy Measuring signal strengths of adjacent base stations in a TDMA radio system for a possible handover
US5617412A (en) * 1994-04-15 1997-04-01 Alcatel N.V. Frame/multiframe structure FDMA system and corresponding signal
WO1996021998A2 (fr) * 1995-01-04 1996-07-18 Nokia Telecommunications Oy Systeme radio pour interface de ligne d'abonne sans fil
WO1997015169A1 (fr) * 1995-10-18 1997-04-24 Telefonaktiebolaget Lm Ericsson Dispositifs et procedes pour mesurer l'intensite d'un signal dans un systeme de radiocommunication
WO1998017021A2 (fr) * 1996-10-15 1998-04-23 Telefonaktiebolaget Lm Ericsson (Publ) Appareils et procedes destines a mesurer l'intensite d'un signal dans un systeme de communication sans fil

Also Published As

Publication number Publication date
SE9800250D0 (sv) 1998-01-29
SE9800250L (sv) 1999-09-21
AU2555199A (en) 1999-08-16

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