EP1405438A1 - Procede de reglage de la puissance d'emission pour la transmission d'informations a plusieurs destinataires dans un systeme radio - Google Patents

Procede de reglage de la puissance d'emission pour la transmission d'informations a plusieurs destinataires dans un systeme radio

Info

Publication number
EP1405438A1
EP1405438A1 EP02752993A EP02752993A EP1405438A1 EP 1405438 A1 EP1405438 A1 EP 1405438A1 EP 02752993 A EP02752993 A EP 02752993A EP 02752993 A EP02752993 A EP 02752993A EP 1405438 A1 EP1405438 A1 EP 1405438A1
Authority
EP
European Patent Office
Prior art keywords
transmission power
transmitter
multicast
receiver
group
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.)
Withdrawn
Application number
EP02752993A
Other languages
German (de)
English (en)
Inventor
Mark Beckmann
Siegfried Bär
Hyung-Nam Choi
Michael Eckert
Thomas Gottschalk
Martin Hans
Frank Kowalewski
Arkadius Szczepanski
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.)
Siemens AG
Original Assignee
Siemens AG
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 DE10132804A external-priority patent/DE10132804A1/de
Priority claimed from DE10149549A external-priority patent/DE10149549A1/de
Priority claimed from DE10158751A external-priority patent/DE10158751A1/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1405438A1 publication Critical patent/EP1405438A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/327—Power control of multicast channels

Definitions

  • the present invention relates to a method for setting the transmission power for the transmission of multicast messages in a radio system, in particular a mobile radio system, and to a correspondingly equipped radio system and correspondingly equipped transmitter and receiver.
  • multicast messages are called messages from a sender, for. B. in a mobile radio system from one, base station, simultaneously to a group of receivers, e.g. B. mobile stations are transmitted.
  • the transmitter therefore sends a multicast message only once to the receivers belonging to the group, so that the effort for transmission is considerably less than with separate transmission of the multicast messages to each receiver in the group.
  • the devices to which the multicast messages are directed and transmitted are not distributed up to the edge of the radio cell, so that radiation of the multicast messages with constant transmission power leads to an unnecessarily high consumption of transmission energy and leads to it unnecessarily Can cause interference in a neighboring cell.
  • the transmitter does not emit the multicast messages with a constantly high transmission power, but adjusts them according to the actual requirements so that each recipient of the group that is to receive the multicast messages receives the multicast messages with a sufficient level Can receive reception quality.
  • the receivers of the group determine a measure of the reception quality of the multicast messages and, depending on this, send back at least one transmission power control signal to the transmitter.
  • this transmission power control signal can be, for example, an increase command ("up command”) if the multicast messages are received with a poor reception quality and the transmitter is to increase the transmission power, and a decrease command (“down Command ”) if the recipient receives the multicast messages with an unnecessarily high reception quality and the sender receives the
  • a receiver can advantageously either use the signal-to-interference
  • SIR Use ratio
  • bit error rate / or a block error rate in block-wise transmission methods in the radio system.
  • These values can preferably be compared in the receiver with predetermined limit values, so that the receiver generates the transmission power control signal depending on whether these limit values are exceeded or not.
  • two variants can be used to carry out the method. In the first, all receivers in the group that is to receive the multicast messages send a transmit power control signal back to the transmitter. This evaluates all incoming transmit power control signals with regard to their content and the respective number and thus adjusts the transmit power. For example, he can increase the transmission power as soon as at least one recipient requests an increase in the transmission power.
  • the transmitter can reduce the transmission power if it does not receive the signal to increase the transmission from any receiver. deaise or receive the signal from all receivers to lower the transmission power. It may also be possible to accept poor reception from a few receivers by reducing the transmission power when the number of control signals that require an increase in the transmission power falls below a certain number.
  • the radio transmission in a radio system can be based on a frame structure according to which the transmission time is divided into frames of the same length. These frames can also be divided into time slots in which data packets are exchanged.
  • the transmission power control signals are not transmitted by the receivers in every time slot, as can be the case, for example, with the power regulation for a transmission channel which only transmits messages directed to a receiver.
  • the transmission power control signals for the multicast messages can advantageously be sent, for example, only once per time frame. In this way, the transmission volume from the receivers to the transmitter can be reduced. This usually has no adverse effects, since the required or optimal transmission power for multicast messages usually changes less quickly.
  • the time intervals in which the transmission power control signals are transmitted can advantageously be made dependent on the determination of the reception quality in the individual receivers.
  • the distance between the transmitted transmission power control signals can thus be increased if the multicast messages can be received with a reception quality that is above the limit value. Accordingly, the frequency of the transmission power control signals can be increased if the multicast messages are received too poorly.
  • the receivers can advantageously also be configured such that they only send transmission power control signals if they can receive the multicast messages with a reception quality that is too low. In such a case, the transmitter would only increase the transmission power if it received such transmission power control signals, and decrease the transmission power if, for example, it did not receive such a transmission power control signal within a certain time. It can also be expedient to define a certain number of transmission power control signals per unit of time as a limit value above which the transmission power is increased and below which the transmission power is reduced.
  • not all receivers in the group are used to regulate the transmission power, but rather a specific receiver or a subgroup of receivers is selected by the transmitter or radio system, which are used as examples for the rest of the group to set the transmission power. These are the receivers that are the least able to receive multicast messages broadcast by the broadcaster. As soon as the transmission power is set so that this subgroup of receivers can receive the multicast messages with sufficient quality, it can be assumed that the remaining receivers in the group, who can receive messages broadcast by the transmitter better, will also receive the multicast messages received a sufficient ordeal.
  • the receivers of the respective group that are furthest away from the transmitter are used, since the reception quality generally decreases with increasing distance.
  • a position detection service of the radio system for example, can be used to determine the distance between a receiver and the transmitter, with the aid of which the distance is determined.
  • round t ⁇ p time As soon as a receiver registers in the radio system, such a round time (“round t ⁇ p time”) is usually determined.
  • this round trip time thus directly represents a measure of the distance between a receiver and the transmitter and can thus serve for the selection of the receiver or the receivers, which are used as examples to set the transmission power of the multicast messages.
  • the transmission power required to transmit the multicast messages to this group may change. The same can apply if a receiver of the group moves and its distance to the transmitter changes. In such cases, it is advisable to ensure that in particular the transmission power is set with respect to the recipient (or recipients) who currently belongs to the group and is furthest away from the transmitter.
  • the present invention is preferably suitable for use in a mobile radio system, in particular a UMTS
  • FIG. 1 shows a simplified illustration of a mobile radio cell of a mobile radio system to explain the transmission of multicast messages according to the invention
  • FIG. 2 shows a layer model to explain the transmission of multicast messages according to the invention
  • FIG. 3 shows a schematic representation of the generation of a transmission power control signal by a subscriber device of a group of subscriber devices for the inventive control of the transmission power of at least one transmitter station of a radio communication system, the radio cell of which the subscriber device and other members of the group are currently in, and the associated, thereupon measured reception quality of message or data signals to be received in this subscriber device,
  • FIG. 4 shows a schematic representation of a radio cell of the radio communication system with a group of subscriber devices, of which at least one subscriber device controls the transmission power of the transmission station of this radio cell according to the method according to the invention
  • DPCCH burst Dedicated Physical Control Channel
  • FIG. 6 shows a frame structure of the uplink control channel MC-DPCCH for multicast applications
  • FIG. 7 shows a sketched representation of a mobile radio cell with spatially selective packet data transmission from a base station NodeB to several mobile stations UE1 to UE6 as a simplified block diagram
  • FIG. 8 shows a structure of a physical multicast channel PMcCH in the downlmk frame structure m TD-
  • FIG. 10 shows a table multicast TPC commands according to the present invention.
  • the radio cell Z shown schematically in FIG. 1 has a base station BS in its center, which represents the transmitter m in the radio system.
  • This base station BS can be assigned a network control unit, not shown, which regulates, for example, the transmission to further radio cells.
  • the receivers MSI to MS ⁇ are randomly distributed over the area of the radio cell Z, so that the receivers MSI to MS ⁇ can have different distances from the base station BS.
  • each recipient consists of MSI to MS ⁇ as well the transmitter BS from a physical layer PL ("physical layer"), which is responsible on the transmitter and receiver side for processing the data for transmission via the air interface via physical channels 1.
  • physical layer PL physical layer
  • media access control layer MAC medium access control
  • the connections between the physical layer PL and the MAC layer are called transport channels 2 and indicate how the data is transmitted (for example on general channels or on channels which are dedicated only to a specific mobile station).
  • the MAC layer has tasks such as For example, the identification of the users for which data is intended, if they are transmitted on general channels, and the mapping of logical channels 3 onto the transport channels 2.
  • the MAC layer adds control information on the transmitter side (eg via the Identity of the mobile station) to the transmitted data which it has received from a radio link control layer RLC ("radio link control") arranged above it.
  • RLC radio link control
  • control formats are evaluated and removed from the data again before they are forwarded via logic channels 3 to the RLC layer.
  • the connections between the MAC layer and the RLC layer are referred to as logical channels 3.
  • the RLC layer is responsible for monitoring the data transmission, ie for detecting missing data and possibly requesting it again.
  • Several units can be defined in the RLC layer. Each RLC unit is connected to a connection between higher layers and RLC (e.g. radio bearer).
  • RLC e.g. radio bearer
  • the RLC layer can also add control information on the transmitter side to data it has received from higher layers. This control format tions are used at the receiving end to e.g. For example, to assess whether data is missing and are removed from the data before it is passed back to the higher layers.
  • the data are transmitted in the radio system in time slots, which in turn are embedded in a fixed frame structure.
  • the frames each last 10 milliseconds and contain 15 time slots over which the data transmitted over a physical channel 1 are distributed.
  • a so-called burst is transmitted in each of these time slots, which represents a sequence of bits that can be divided into m different data fields.
  • the multicast messages to be transmitted are mapped according to the layer model onto a physical channel 1, which is transmitted via the air interface from the transmitter BS to at least one receiver MSI to MS ⁇ .
  • the transmission power of this physical channel 1 is now regulated in such a way that all those of the receivers MSI to MS ⁇ who are to receive the multicast night can receive it with at least a certain minimum reception quality.
  • the receivers MS4 to MS ⁇ form a reception group for multicast messages which are sent out by the transmitter BS.
  • all receivers MSI to MS ⁇ should be equipped in such a way that they can determine the reception quality of received multicast messages and compare them with predefined limit values. Depending on this, they generate a transmission power control signal which is an up command to increase the transmission power if the reception quality is too poor and a down command if the reception quality is above the limit value.
  • all receivers MS4 to MS ⁇ in the group send the transmission power control signals to the transmitter BS.
  • the transmitter BS is set up so that it has the transmission power for the transmission of the multicast messages as long as it receives an up command from a receiver MS4 to MS ⁇ in the group.
  • the setting of the transmission power will now be described.
  • all receivers MS4 to MS ⁇ send up commands, so that the transmitter BS gradually increases the transmission power. This also increases the reception quality for the receivers MS4 to MS ⁇ , the reception quality first reaching the required value for the closest receivers MS4 and MS5.
  • receivers MS4 and MS5 send down commands, whereas the more distant receiver MS ⁇ continues to send up commands.
  • the transmitter BS now continues to increase the transmission power until a time at which the reception quality at the receiver MS ⁇ is sufficiently high so that the latter stops sending up commands and sends down commands when the transmission power increases further.
  • the transmitter BS was only given down commands, so that it reduces the transmission power again, but it only reduces the transmission power until the most distant receiver MS ⁇ again receives the multicast messages with a poor quality receives and starts sending up commands.
  • the transmission power of the transmitter BS for the transmission of multicast messages to the receivers MS4 to MS ⁇ is set in this method in such a way that it leads to a fluctuation in the reception quality around the required limit value for the most distant receiver MS ⁇ .
  • the receiver MS ⁇ alternately sends up and down commands, whereas the other, closer receivers MS4, MS5 constantly send only down commands. The latter receive the multicast messages with an unnecessarily high quality, but this is inevitable if the recipient MS ⁇ is also to receive the multicast messages with a sufficient quality.
  • the transmitter BS is expediently set up in such a way that it also reduces the transmission power if it does not receive an up command for a certain time.
  • the receivers MSI to MS4 now form a group which is to receive multicast messages together.
  • the transmitter BS determines a measure for the distance of the various receivers MSI to MS4 in the group. For this purpose, the size of the round trip time (RTT) can be used by the transmitter BS.
  • RTT round trip time
  • the transmitter can estimate the distance of each receiver MSI to MS4 in the group from the transmitter BS. This allows the most distant MSI receiver to be selected for power control.
  • the transmitter BS regulates the power in such a way that the power is increased when the receiver sends MSI up commands and is decreased when the receiver sends MSI down commands.
  • the other receivers MS2 to MS4 are located closer to the transmitter BS, so that they can generally receive the multicast messages with a better quality than the receiver MSI, so that one for all receivers MSI to MS4 in the group Minimum reception quality is ensured.
  • the transmission power may be readjusted.
  • the newly added receiver MS ⁇ gives feedback to the radio system as to whether the multicast messages are already being received well enough. An unnecessary change in the transmission power of the transmitter BS can thereby be avoided.
  • FIGS. 1 and 2 are generally valid within the scope of the invention.
  • the invention further relates to a method for controlling the transmission power of at least one transmission station of a radio communication system, an associated subscriber device and an associated transmission station.
  • subscriber devices in the respective radio cell as well as across radio cells can be assigned to one or more groups.
  • the subscriber devices of such a group are then jointly supplied with information or data via a group message signal.
  • so-called multicast groups of subscriber devices per radio cell or across cells can be distributed over several radio cells, which then receive common services, user data / user messages, signaling signals, etc., group-selectively sent.
  • a group-specific classification or classification of subscriber devices can, for example, with regard to the respective type of message, such as in sports news, weather news, traffic news, etc.
  • the invention is particularly based on the object of demonstrating a way in which the transmission power of at least one transmission station of the radio communication system in which one or more subscriber devices of the respective group are currently located can be controlled in a simple and efficient manner in such a way that the subscriber devices are to be transmitted - Ten- / Nachr ⁇ chtens ⁇ gnale and other signaling signals can still receive with sufficient, ie not with insufficient reception quality.
  • This task is solved in an advantageous manner by the following method:
  • Method for controlling the transmission power of at least one transmission station of a radio communication system the radio cell of which contains at least one predefinable group of one or more subscriber devices, in particular according to one of the preceding claims, characterized in that the transmission station of at least one subscriber device of the group using at least one transmission power - The control signal is only communicated as long as the transmission power is increased as long as the measured reception quality of this subscriber device is below a predefinable threshold value, and that no control signal of this subscriber device is sent to the transmitting station if its measured reception level reaches the threshold value or is above it.
  • the transmitting station m of the respective radio cell in which one or more subscriber devices of the respective group are present, is only informed by at least one of these subscriber devices with the aid of at least one transmit power control signal for as long as the transmit power increases as the measured reception quality of this subscriber device is below a predeterminable threshold value, and otherwise no control signal is sent to the transmitting station, the transmitting power of this transmitting station can be controlled in an efficient manner.
  • the respective subscriber device of the group can detect night signals, data signals and other signaling signals of the transmitting station arriving with a sufficient reception power level.
  • the invention further relates to a subscriber device for carrying out this method explained above.
  • the invention also relates to a transmitting station of a radio communication system which is designed to carry out this method.
  • FIG. 4 shows only a single radio cell representative of a large number of further radio cells of a cellular radio communication system and is designated CE1.
  • This radio cell CE1 is supplied with radio technology from a transmitting station BS1, in particular a base station, i.e. clamped.
  • a base station is responsible for radio communication with the one or more subscriber devices that are located there.
  • the respective base station is e.g. BSl approximately in the center of the respective radio cell, e.g. CE1 arranged.
  • the respective base station is preferably formed by at least one radio transmitter and at least one radio receiver. In particular, it has at least one transmitting antenna.
  • the respective base station serves to establish connections to coordinating, controlling components of the radio communication system and / or to an existing fixed network.
  • UMTS Universal Mobile Telecommunication System
  • FDD Frequency Division Duplex
  • uplink signal transmission from the respective subscriber device to the respectively assigned base station
  • Downlmk signal transmission from the respectively assigned base station to the respective subscriber device
  • two different carrier frequencies are advantageously used for signal transmission in the uplink and downlink direction.
  • FIG. 4 there are currently several subscriber devices MSI with MS5 in the radio cell CE1. These subscriber devices are preferably mobile stations, in particular mobile radio telephones or cell phones. The same applies to the other radio Lines of the radio communication system which, for the sake of clarity, have not been shown in FIG. 4.
  • the subscriber devices are preferably mobile, ie at different locations in the different radio lines of the radio communication system. If necessary, some of the subscriber devices can also be arranged in a stationary, ie stationary, manner in one or more radio cells.
  • These can be, for example, Internet computers, television sets, notebooks, fax machines, etc.
  • the member-subscriber devices of such a group can all be in the same radio cell as well as distributed in several radio cells of the radio communication system.
  • One or more group messages can then be sent to the members of the respective group from the base station m of the respective residential radio cell of these subscriber devices using only one radio resource provided, which is particularly efficient.
  • group-wise notification of member-subscriber devices of predefined groups it is no longer necessary to set up an extra individual radio connection for each individual member device. It is therefore no longer necessary to signal, set up and provide n individual connections for n subscriber devices in a radio cell to which the base station there is to send the same message.
  • FIG. 4 there is an example of a first group MCI in the radio cell CE1 through the three mobile radio devices MSI with MS3 educated.
  • a group-specific subdivision can take place, for example, with regard to the function (multicast, broadcast), the news topic (sports, weather, politics, business) and other types of classification.
  • various services are offered, for example the voice service, sending and receiving SMS messages (short message system), calling up information using WAP (Wireless Application Protocol), etc.
  • SMS messages short message system
  • WAP Wireless Application Protocol
  • the information that is to be given to all participants in such a group is only transmitted to all users simultaneously via only a single radio channel.
  • transmission in the uplink direction In contrast, data transmission in the opposite direction from the respective mobile radio station to the respectively assigned base station is referred to as transmission in the uplink direction.
  • FDD mode data transmission in the opposite direction from the respective mobile radio station to the respectively assigned base station is referred to as transmission in the uplink direction.
  • the transmission m up and down is carried out on different frequencies.
  • Several subscribers per radio cell are separated by stamping orthogonal codes (channelization codes) on the information data.
  • This multiple access method is known as the CDMA method.
  • UMTS-FDD-Modes is a physical channel in the downlink direction, in particular defined by a carrier frequency, scrambling code, the channelization code and a start and stop time.
  • the purpose of the scramble codes is to scramble the already spread data signals. Among other things, this is intended to minimize the interference (interference) from and neighboring cells.
  • broadcast channel Broadcast Channel
  • BCH Broadcast Channel
  • the special thing about this radio channel is that the transmitted information is not specifically sent to a specific, ie special, mobile radio station are directed. As soon as, for example, a mobile radio station is switched on, the information of the broadcast channel is read out from it, without any signaling of the radio network.
  • This radio channel cannot be used for the transmission of multicast information or can only be used to a limited extent, since its limited capacity (according to the current specification m UMTS of approximately 30 kbps) is already occupied by the cell-specific information.
  • m UMTS of approximately 30 kbps
  • Common channels With dedicated channels, a physical radio resource is reserved only for the transmission of information for a specific subscriber. With the common channels, information can be transmitted that is intended for all participants in the respective radio cell
  • the common channel also transmits for which subscriber the information is intended.
  • a SIR (Signal to Interference Ratio) based power control with closed control loop can be used, which is particularly detailed in the specification TS 25.214 V3.5.0 Physical layer procedures, 3GPP-TSG-RAN, 2001).
  • a so-called TPC command (TPC Transmit Power Control) is generated by comparison with a predefined target value SIRtarget, and the result is transmitted to the associated via an upmk channel.
  • the value for the target value SIRtarget is expediently specified individually by the radio network for each mobile radio station in such a way that for the respective wavy radio connection an adequate reception quality is guaranteed.
  • the radio network for each transport channel DCH possibly also a desired target value BLER ta rget value as so-called "block error rate * (block error rate) or BER target value as so-called” bit error rate * Specify (bit error rate).
  • the mobile radio station independently determines the SIR target)
  • the TPC commands are preferably purely Boolean information and merely represent the information as to whether the measured SIR value is below or above the specified value SIRtarget lies.
  • the "UP” command means that the reception quality in the respective mobile radio device is not sufficient, and therefore an increase in the transmission power is necessary for the transmission unit of the base station.
  • the Down command means that the transmission power of the transmission unit of the base station is too strong for the particular station measuring mobile radio device sends, so that the transmission power can be reduced.
  • the transmission power of the base stations there for the message transmission of one or more group messages, in particular multicast groups is of interest, such as for a group of one or more subscriber devices which can be located in a single radio cell or in an area distributed over several radio cells - straighten, can be controlled as efficiently and reliably as possible.
  • the respective base station is informed by at least one subscriber device of the group in its local radio cell with the aid of at least one transmission power control signal only as long as it increases its transmission power as long as the measured reception quality of the received radio signals m requesting mobile radio device transmitting control signal below one predefinable threshold value lies.
  • FIG. 3 Time t is plotted there along the abscissa.
  • the exemplary received power level DP of radio signals in the subscriber device MSI of group MCS1 of FIG. 4 is shown along ord RP.
  • the time profile of the transmission power level of a control signal sequence SL1 of the mobile radio device MSI for the desired setting of the transmission power of the assigned base station is shown.
  • the strength, ie the transmission power level TP, for the control signal sequence SL1 is plotted along the ordmats.
  • RP in the first, upper diagram is some measure of the reception quality in the respective subscriber device, such as MSI, and TP in the lower, second diagram, the power with which the subscriber device MSI sends one or more control signals to the base station BS1.
  • the dotted horizontal line in the upper, first diagram shows a desired, predeterminable reception quality SW, which should suitably be maintained for the subscriber device as the minimum quality for the measured reception level.
  • this threshold SW is undershot, for example at time tA, the subscriber device MSI sends one or more control signals SSI, SS2,..., SSk, SSi at certain time intervals TZ, preferably with increasing transmission power.
  • control signal sequence SL1 can only be detected by the base station BSl from the moment tS onwards from its pulse SSk (in particular, tS is shortly before or at least simultaneously with the transmitted control signal SSk), whereupon this in turn transmits the transmission power or Radiation power for group signals is preferably increased in stages.
  • the control signals SSk to SSi which are sent from the subscriber device MSI to the base station BS1 and from the base station BS1 with a continuously or stepwise increased transmission power from the time tS can also be received are identified by hatching in the lower diagram of FIG. 3.
  • the base station BS from the time tS also turn its transmission power during the transmission of thconvergenach ⁇ ch- or group of signals increases, also increases the Empfangsqua ⁇ LITAT in prisongerat MSI.
  • the reception power curve DP rises again in the upper diagram after its drop between the times tA and tS below the threshold value SW from the time tS. From the time tE after the control signal SSi, the reception level curve DP finally reaches the desired target threshold value SW, which has been specified as sufficient for a perfect reception quality. From this point in time tE, from which the predetermined reception quality is reached again, the subscriber device MSI ends the transmission of control signals, so that a rest phase or dead time PA occurs. At the same time, the base station also advantageously stops increasing its transmission power when transmitting group messages.
  • a multicast information which is sent from the base station BS1 m FIG. 4 to all mobile stations MSI with MS3 of the same multicast group MCI m of the radio cell CE1 is to be made sufficiently receivable for all mobile stations in this group with at the same time minimal allocation of radio resources
  • the multicast radio channel is referred to below in particular as the Physical Multicast Channel DMCCHS. It is therefore desirable that the multicast information can be detected by all mobile stations of the respective multicast group whose current location radio cell is of sufficient reception quality (with at the same time minimal use of transmission resources).
  • each of the mobile stations that is to receive the same multicast service measures the reception quality.
  • SIR value signal to interference ratio
  • BLER Block Error Rate
  • the measured Empfangsqualitatsmesswert is in each case with a predetermined, desired threshold value, such as SIR T arget / BLER Ta rget / BER target or a similar Solldorfwert for the reception quality compared.
  • a predetermined, desired threshold value such as SIR T arget / BLER Ta rget / BER target or a similar Solldorfwert for the reception quality compared.
  • the reception quality is better than the specified threshold, e.g. SW (see Figure 3) or equal to the specified threshold. Then the respective mobile radio station should not do anything, i.e. no longer send a control signal to the relevant base station, since reception is guaranteed with sufficient quality.
  • the specified threshold e.g. SW (see Figure 3) or equal to the specified threshold.
  • the reception quality in the respective mobile radio device is worse than the predetermined target threshold value, which could be the case, for example, with the mobile radio device MSI from FIG. 4, since it is the furthest away from the base station BS1 from all mobile radio bones of the MCI group. Only in this case is the mobile station to signal the base station according to the above method, i.e. send at least one control signal to increase the transmission power of the base station, whereupon the base station in turn increases its transmission power until the reception quality even in the most distant subscriber device reaches the threshold value or lies above this.
  • Version 1 :
  • a so-called preamble is defined in a group-specific manner, which can be specified as a predefinable chip sequence via the mobile radio channel (for UMTS, a physical channel is defined, among other things, via a channelization code. Such a code should not be used in variant 1) of each Mobile radio device is sent to the base station, the reception quality of which is poorer than the predetermined threshold value.
  • This preamble signal is known both to the relevant base station and to all mobile radio stations belonging to the respective multicast group.
  • the predefinable preamble signal as a chip sequence is preferably different from the orthogonal codes for subscriber device separation.
  • PRACH Random Access Channel
  • the respective mobile radio station sends the preamble signal pattern to the base station with a specific transmission power, that is to say preamble signal start power. This is preferably repeated regularly at certain intervals (preamble transmission intervals), each time with a transmission power increased by a certain value (power increase increment). Concrete values for preamble start power, preamble transmission interval and power increase increment can preferably be determined by each mobile radio station itself, but may also be specified by at least one component of the radio network by prior radio signaling.
  • This first method advantageously ensures that the base station can detect the significant, predefined preamble signal pattern at some point.
  • the detection can be carried out, for example, with the aid of a simple correlator in the base station. How long it takes for the base station to detect this preamble control signal depends in particular on the start values for the three parameters listed above.
  • the detection of the preamble control signal is synonymous for the base station as a TBC command "UP".
  • the base station continues to increase its transmission power for multicast messages at selectable time intervals, until the transmission (on the mobile station side) or the detection (on the base station side) of this preamble signal - there is no pattern. This will be the case when the mobile radio station that sent the preamble signal pattern has a sufficiently good reception quality due to the increased transmission power of the multicast messages. This is achieved when the reception quality is at or above the predefinable threshold.
  • the transmission power control signal of the respective subscriber device is transmitted as a common, group-specific preamble signal to the respectively assigned base station, which is based on the pre-reserved code multiplex signals which are used for the actual message / data transmission of the various subscriber devices in the respective radio cell. is different.
  • Version 2 This variant is functionally similar to variant 1. The difference is in particular that instead of a preamble control signal e, a group-shared code multiplex signal from the respective mobile radio device, whose reception quality is below a predefinable threshold, is sent to the relevant base station for setting its transmission power accordingly is that the reception quality in this mobile radio device is increased to the threshold value or above.
  • a so-called DPCCH burst which is transmitted on a dedicated physical control channel already provided in the UMTS, is preferably used as the group-shared code multiplex control signal. The time division or sectorization of such a burst is shown in FIG. 5.
  • the local burst TS can send 10 bits per slot, i.e.
  • PL training sequence, which can be used, for example, to determine the SIR value
  • TFCI transport format Combmation Indicator
  • FBI Feedback Information
  • TPC Transmit Power
  • the DPCCH burst TS of FIG. 5 has in particular a time length of 0.667 milliseconds (msec) in UMTS, which corresponds to a time slot that is once again divided into 2560 chips.
  • msec milliseconds
  • em or two bits e can be made available depending on the configuration.
  • This field can also be used in this variant for the "UP" command and can be set with bit values such as 1. Since the other fields have no use in this case, the transmission of other information in the fields PL, TFCI, FBI can, if necessary, be dispensed with entirely, and these empty fields can then be used for additional information on the control signal TPC.
  • 10 bits can be used for the control signal in this way, so that an increase in the transmission power of the base station can be indicated with an "UP" command, and further additional information can also be supplied if necessary. It would also be conceivable, for example, with the number of the bits which are assigned 1 (the rest of the bits are then assigned the logical 0) to give an indication of how large the selectable step size should be with the steadily increasing transmission power on the part of the respective base station. If, for example, all 10 bits are assigned the value 1, the distinction between the reception quality and the specified value is very high and the base station should expediently carry out larger steps to adapt the transmission power.
  • the increase in the transmission power in the base station is stopped, since this is an indicator or indication that the reception quality of the mobile radio device which issues the control signal again corresponds to the predetermined threshold value or exceeds it again.
  • a different number of ones ("1") in the burst of the base station m advantageously give an indication of how strongly / m how it should increase your transmission power (e.g. with higher increments and / or with more frequent increases).
  • the regulation or control of the transmission power m of the respective base station is expediently carried out automatically as follows: if the base station receives no command within a certain time, that is to say no control signal for increasing the transmission power (the base station thus detects within a certain time) no preamble signal pattern or a weak or no burst), it automatically reduces the transmission power in a selectable range Step size and in selectable time intervals until it receives such a control command again (since any mobile radio station from the multicast group has poor reception quality and therefore starts to send a preamble signal pattern or a burst).
  • ⁇ TP difference in the transmission power of two successive control signals
  • ⁇ TP can preferably either be freely selected by the respective mobile radio station or, if appropriate, also specified by the base station (that is, signaled beforehand).
  • a radio resource or in particular only one radio resource per multicast group (or a number of multicast groups) is used in the uplink.
  • the present invention advantageously also relates to a method, a transmitting and / or receiving unit and a communication system for controlling the transmission of data via a mobile radio link in a mobile radio system according to the Universal Mobile Telecommunications System standard UMTS, in particular for efficient power control for future multicast Applications in UMTS FDD mode according to claims 33, 44, 45.
  • the current version of the UMTS standard referred to as Release 4, as of 06/2001, contains three radio transmission technologies: the frequency domain duplex or FDD mode, the 3.84 Mcps time domain duplex or TDD mode and the 1.28 Mcps TDD mode.
  • the following explanations refer exclusively to the FDD mode (see [l] - [5] at the end of the description).
  • uplink is understood to mean the transmission of the data from a mobile subscriber terminal, for example a cell phone or the like, to a base station.
  • the mobile subscriber terminal is called UE below, the base station is referred to as NodeB.
  • NodeB the base station
  • the transmission of the data from the NodeB to the UE is referred to as a downlink.
  • the channels or the individual participants are separated by applying orthogonal codes, see above. Spreading codes on the information data.
  • power control is an important element.
  • the task of power control is to set the transmission power for each connection direction, that is to say both for uplink and for downlink, so that the data can be transmitted efficiently via the physical channels with a ner certain transmission quality are transmitted without disturbing other participants.
  • [4] specifies the power control procedures for the various physical channels.
  • the downlink common channels for example, data is sent unidirectionally from the NodeB to all UEs or to a specific UE in the cell.
  • the common channels are transmitted with a constant transmission power so that they can be received well in the entire cell.
  • the dedicated channels on the other hand, are used for bidirectional data transmission between the NodeB and a specific UE.
  • the transmission power for these channels is set in the form of a SIR-based power control.
  • the task of the SIR-based power control is to set the transmission power of the channels individually for each connection direction in such a way that a predetermined value of the signal-to-interference ratio SIR is maintained at the respective receiving antenna.
  • the SIR-based power control in the downlmk direction is carried out as follows.
  • the NodeB initially sends data via a downlink dedicated channel to the UE with a constant transmission power.
  • the UE carries out a measurement of the SIR on the received data on the dedicated channel. This value represents a quality criterion for the channel received.
  • SIRtarget By comparison with a specified value SIRtarget, a transmit power control or TPC command for changing the power is generated at the NodeB and the result is sent back to the NodeB via an associated uplink dedicated channel.
  • the value for SIRtarget is specified individually by the UMTS network for each UE in such a way that sufficient quality is guaranteed for the respective connection.
  • TPC commands TPC_cmd are pure 1-bit information. TPC commands merely represent the information as to whether the measured SIR is below or above the specified value SIRtarget. After receiving a TPC command, the transmission power for the next downlink dedicated channel is then changed in the NodeB by a specific amount ⁇ T pc x
  • TPC_cmd e.g. by + ldB.
  • the process is as follows:
  • a basic concept of multicast transmission in the downlmk direction is described above with the aid of FIGS. 1 to 5.
  • the main content is the implementation of the physical downlink multicast channel and the associated procedures for power control.
  • a further development of this invention is based on the object of proposing a method and a device which, based on this multicast concept, provide efficient power control for future multicast applications in UMTS FDD mode.
  • This also includes the implementation of an associated uplink channel and the definition of TPC commands that are to be generated in the UE.
  • This object is achieved according to the invention by em method with the features of claim 33.
  • a transmitting and / or receiving unit according to claim 44 and a communication system with the features of claim 45 are solutions to this problem.
  • a first method for realizing an efficient power control for future multicast applications in UMTS FDD mode is characterized by the fact that an uplink multicast channel is used for the transmission of control data for the optimal implementation of multicast applications. Via this uplink multicast channel as the physical channel, each subscriber terminal UE of a multicast group transmits the control information that is necessary for the optimal implementation of multicast applications.
  • the uplink multicast channel basically has the same appearance as the uplink DPCCH, which is already used in FDD.
  • the multicast channel is therefore referred to here as MC-DPCCH.
  • the following pilot bits are transmitted on each time slot: Transport Format Combination Indicator or TFCI bits, Feedback Information or FBI bits and Transmit Power Control or TPC bits.
  • the MCI bits are used to represent the NodeB informs about which multicast services the respective UE uses.
  • the exact number of bits to be transmitted in the individual fields of the MC-DPCCH is variable, reference being made to the description of an exemplary embodiment with reference to the drawing.
  • an efficient power control for future multicast applications in UMTS FDD mode is created by introducing a new SIR-based power control.
  • the goal of any SIR-based power control is that all UEs of the multicast group can receive the downlink multicast channel within the cell in sufficient quatttat. For this reason, it is necessary that a regulation of the transmission power in the downlink is designed for the UE h which receives the downlink multicast channel with the worst quality.
  • new TPC commands TPC_cmd which preferably represent 2-bit information, are defined for multicast.
  • Each UE continues to perform a measurement of the SIR per time slot on the received data on the downlink multicast channel.
  • a TPC command for changing the power at the NodeB is generated slot by slot by comparison with predefined SIR thresholds and the result is transmitted to the NodeB via the MC-DPCCH.
  • the NodeB After receiving the TPC commands from all UEs of the multicast group, the NodeB combines them into one TPC command per slot and changes the transmission power for the next downlmk connection by a certain amount ⁇ TPC x TPC_cmd.
  • the new TPC commands TPC_cmd with 2-b ⁇ t information content
  • an amount ⁇ SIR is introduced as a tolerance interval around a preset value SIRtarget, which is in particular formed symmetrically on two sides.
  • a method for creating a combined TPC command as a function f of the N TPC commands of all UEs of a multicast group in the uplink is proposed.
  • the NodeB receives a variety of TPC commands to change the transmission power for the downlink multicast channel.
  • the task of the NodeB is now to process the weighting of individual N TPC commands of all UEs with appropriate control so that the data on the downlink multicast channel of each UE of the multicast group within the cell is sufficient can be received.
  • a combined TPC command is created as a function f of the N TPC commands of all UEs of a multicast group which • triggers an increase in the transmission power for the entire multicast group if at least an "Up" command is received, regardless of what the other NI TPC commands say; • does not provide for a change in the transmission power if all N TPC commands as "Do nothing" commands are received and
  • FIG. 6 shows the frame structure of the uplink control channel for multicast applications.
  • Each UE of the multicast group transmits the control information on this physical channel, which is necessary for the optimal implementation of multicast applications.
  • This uplink multicast channel has the same appearance as the uplink DPCCH, which already has FDD.
  • the multicast channel is therefore referred to here as MC-DPCCH.
  • the following pilot bits are transmitted on each time slot or slot: Transport Format Combination Indicator or TFCI bits, Feedback Information or FBI bits and Transmit Power Control or TPC bits.
  • the spreading factor SF of 256 is provided for the MC-DPCCH, so that 10 control bits can be transmitted in the uplink per slot.
  • Uplink multicast commands The aim of the SIR-based power control is that all UEs of the multicast group can receive the downlink multicast channel within the cell in sufficient quality. For this reason, it is necessary that the regulation of the downlink transmission power must be designed for the “weakest” UE.
  • the term “weakest” UE means the UE that receives the downlink multicast channel with the poorest quality.
  • frequent changes in the transmission power at the NodeB should be avoided.
  • new TPC commands TPC_cmd are defined for multicast, which now represent 2-bit information.
  • each UE carries out a measurement of the SIR per time slot on the received data on the downlink multicast channel.
  • a TPC command for changing the power at the NodeB is generated slot by slot by comparison with predefined SIR thresholds and the result is transferred to the NodeB via the MC-DPCCH.
  • the NodeB After receiving the TPC commands from all UEs of the multicast group, the NodeB combines them into one TPC command per slot and changes the transmission power for the next downlink connection by a certain amount ⁇ T pc x TPC_cmd.
  • Each UE should generate the new Multicast TPC commands in the following way:
  • TPC_cmd 1) generated in the UE and transmitted to the NodeB via the MC-DPCCH. After receiving the up- Command transmit the transmission power of the downlink multicast channel increased by the amount ⁇ T PC.
  • TPC_cmd 0
  • TPC_cmd -1
  • the NodeB receives one
  • TPC commands to change the transmission power for the downlink multicast channel.
  • the task of the NodeB is now to combine the various TPC commands into one TPC command, so that the data on the downlink multicast channel can be received by any UE of the multicast group within the cell with sufficient quality.
  • a combined TPC command will be generated as a function f of the N TPC commands of all UEs:
  • TPC_cmd f (TPC_cmd_l, TPC_cmd_2, ..., TPC_cmd_N)
  • the NodeB should generate the combined TPC command in the following way:
  • - TPC_cmd 1: At least one "Up” command is received, regardless of what the other NI TPC commands say.
  • - TPC_cmd 0: All N TPC commands are received as "Do nothing" commands.
  • TPC_cmd -1: If at least one "Down" command is received under the N TPC commands and there is no "Up” command among the remaining N-1 TPC commands.
  • a multicast scenario is assumed to represent an exemplary embodiment according to the present invention, as shown in FIG. 7.
  • a UMTS radio cell with a NodeB and 6 UEs, UEl to UE6 is assumed.
  • the physical multicast channel PMcCH is used in accordance with the principle of the embodiment variants of FIGS. 1 to 5, see FIG. 8.
  • the NodeB now sends the multicast data in the data part of the PMcCH to all ⁇ UEs of the multicast group initially with a constant transmission power. All UEs performed a measurement of the SIR per time slot on the received data on the PMcCH.
  • Em TPC command is then generated for each time slot to a nursea precise ⁇ PMC C H at the NodeB and the result is transmitted via the MC-DPCCH to the Node B by comparison with predetermined SIR threshold according to the table of FIG 10th

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Abstract

L'invention vise à mettre en oeuvre la transmission d'informations destinées à un groupe de destinataires (MS1 MS6) dans un système radio. A cet effet, la puissance d'émission d'un émetteur (BS) est réglée de manière que tous les destinataires (MS1 MS6) du groupe puissent recevoir les informations à plusieurs destinataires avec une qualité de réception suffisante. Par ailleurs, les récepteurs (MS1 MS6) déterminent la qualité de réception des informations à plusieurs destinataires reçues, et envoient en fonction de celle-ci au moins un signal de commande de puissance d'émission en retour à l'émetteur (BS). Celui-ci évalue ensuite les signaux de commande de puissance d'émission de tous les destinataires (MS1 MS6) du groupe afin de régler la puissance d'émission de manière correspondante.
EP02752993A 2001-07-06 2002-07-03 Procede de reglage de la puissance d'emission pour la transmission d'informations a plusieurs destinataires dans un systeme radio Withdrawn EP1405438A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE10132804A DE10132804A1 (de) 2001-07-06 2001-07-06 Verfahren zum Einstellen der Sendeleistung für die Übertragung von Multicast-Nachrichten in einem Funksystem sowie entsprechend ausgestaltetes Funksystem und entsprechend ausgestalteter Sender und Empfänger
DE10132804 2001-07-06
DE10149549 2001-10-08
DE10149549A DE10149549A1 (de) 2001-07-06 2001-10-08 Verfahren zur Steuerung der Sendeleistung mindestens einer Sendestation eines Funkkommunikationssystems, zugehöriges Teilnehmergerät sowie Sendestation
DE10158751 2001-11-30
DE10158751A DE10158751A1 (de) 2001-11-30 2001-11-30 Verfahren zur Steuerung der Übertragung von Daten über eine Mobilfunkstrecke
PCT/DE2002/002425 WO2003005603A1 (fr) 2001-07-06 2002-07-03 Procede de reglage de la puissance d'emission pour la transmission d'informations a plusieurs destinataires dans un systeme radio

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EP1405438A1 true EP1405438A1 (fr) 2004-04-07

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US20030119452A1 (en) * 2001-10-19 2003-06-26 Samsung Electronics Co., Ltd. Apparatus and method for controlling transmission power of downlink data channel in a mobile communication system supporting MBMS
WO2004013981A2 (fr) 2002-08-01 2004-02-12 Interdigital Technology Corporation Reglage de la puissance de canaux physiques point a multipoint
EP1492249A1 (fr) * 2003-06-25 2004-12-29 Siemens Mobile Communications S.p.A. Procédé de commande de la puissance d'émission en liaison descendante pour service multidiffusion dans des réseaux de radiotéléphonie mobile
CN101656917B (zh) * 2003-10-08 2013-06-12 高通股份有限公司 在无线通信系统中用于反馈报告的方法和装置
US8687607B2 (en) * 2003-10-08 2014-04-01 Qualcomm Incorporated Method and apparatus for feedback reporting in a wireless communications system
US7321570B2 (en) * 2004-02-03 2008-01-22 Motorola, Inc. Method and apparatus for dynamic power allocation to a multimedia broadcast/multicast service
FR2866188B1 (fr) * 2004-02-11 2006-05-05 Nec Technologies Uk Ltd Procede d'optimisation des ressources radio allouees a un service mbms

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JP3343908B2 (ja) 1999-06-22 2002-11-11 日本電気株式会社 同報通信方法とそのシステム及びその基地局装置と移動局
US6360076B1 (en) 1999-10-06 2002-03-19 Telefonaktiebolaget L M Ericsson (Publ) Method of broadcasting a quality over-the-air multicast

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