WO2007023000A1 - Procede de commande d'une interruption de transmissions pour reduire les interferences dans un systeme de radiocommunication - Google Patents

Procede de commande d'une interruption de transmissions pour reduire les interferences dans un systeme de radiocommunication Download PDF

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Publication number
WO2007023000A1
WO2007023000A1 PCT/EP2006/008408 EP2006008408W WO2007023000A1 WO 2007023000 A1 WO2007023000 A1 WO 2007023000A1 EP 2006008408 W EP2006008408 W EP 2006008408W WO 2007023000 A1 WO2007023000 A1 WO 2007023000A1
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WO
WIPO (PCT)
Prior art keywords
channel
transmissions
base station
subscriber terminal
transmission
Prior art date
Application number
PCT/EP2006/008408
Other languages
German (de)
English (en)
Inventor
Markus Wimmer
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
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 Nokia Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Publication of WO2007023000A1 publication Critical patent/WO2007023000A1/fr

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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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/44—TPC being performed in particular situations in connection with interruption of transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • 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
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • 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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • the invention relates to a method for controlling an interruption of transmissions in a radio communication system, in particular of transmissions between base stations and subscriber terminals, with the aim of reducing interference.
  • radio communication systems for example according to the well-known UMTS standard (Universal Mobile Telecommunication System), which is specified within the framework of the 3GPP (Third Generation Partnership Project), information such as voice, video data, etc. is inter alia via a radio interface Transfer base stations of the system and mobile or fixed subscriber terminals.
  • UMTS Universal Mobile Telecommunication System
  • 3GPP Third Generation Partnership Project
  • E-DCH enhanced UMTS uplink channel
  • E-DCH enhanced UMTS uplink channel
  • the number of subscriber terminals within a radio cell which can maintain connections to a base station of this radio cell at a time, is generally limited by the radio resources allocated to the Dedicated Physical Control Channels (DPCCH). While radio resources required for transmission of traffic data by means of so-called fast allocation methods (engl, fast scheduling schemes), which are required by known methods, can be dynamically allocated and reduced again, this is the case for the so-called HS-DSCH (High Speed Downlink Shared Channel) for downlink transmissions Downlink (DL)) and the E-DCH for uplink (UL) applications already in use, the associated control channels are permanently assigned and exchanged therein control information and signaling, so that they during the entire period of a connection prove the assigned radio resource.
  • DPCCH Dedicated Physical Control Channels
  • the associated control channel HS-DPCCH in the uplink direction which transmits so-called CQI reports (Channel Quality Information) and HARQ confirmations (Hybrid Automatic Repeat Request), is given a predetermined value Relative to a transmission power of the control channel DPCCH sent out in the upward direction.
  • This ratio can vary between 1/3 and 3, but is typically configured as 1, i. DPCCH and HS-DPCCH are transmitted with the same transmission power.
  • no ACK / NACK acknowledgments of the HARQ protocol are transmitted in the uplink direction.
  • the uplink control channel of a single subscriber terminal still causes 1.67% noise increase, assuming CQI reports in each TTI (Transmission Time Interval). be transmitted from the subscriber terminal.
  • CQI reports in each TTI Transmission Time Interval
  • a number of 60 subscriber terminals supporting both HS-DSCH and E-DCH already cause 100% of the possible total noise rise solely through the associated control channels, i. without any additional user data being transmitted in the transmission channels.
  • 20% of the total possible noise increase is attributed to the control channels, this would limit the number of concurrently supported subscriber end rates to only 12.
  • this European patent application focuses on the situation of Internet-based services, on the one hand, on the other hand, high data rates and strict requirements for maximum allowed delays.
  • no status change from the so-called CELL_DCH status into another status of the subscriber terminal can take place, since high data rates can be supported exclusively in the CELL_DCH status and a status change would generally take several 100 milliseconds, which means a violation of the requirements for maximum allowed delays.
  • subscriber terminals with a corresponding Quality of Service (QoS) profile would need to remain in the CELL_DCH status, regardless of whether data transfers occur or not.
  • QoS Quality of Service
  • a so-called hold state is introduced, according to which the base station currently serving a subscriber terminal reduces the transmission power of the common channels in the upward direction.
  • two cases are distinguished.
  • the base station after determining that there is no data transmission in the upward direction, the base station, for example after receiving a corresponding signaling from the subscriber terminal, sets a so-called signal-to-interference ratio (signal to interference ratio) Ratio Target (SIR target) for the DPCCH channel is reduced in the uplink direction, ie the control channel is transmitted by the subscriber terminal with a transmission power lower than the previously used transmission power in upstream and downstream data transmission, the base station reduces both the SIR target value for the DPCCH channel in the uplink direction and the subnetwork.
  • user terminal commanded an interruption of the transmissions in the HS-DPCCH channel.
  • Radio Bearers are mapped to physical HSDPA and E-DCH channels.
  • DPCCH channels for the downlink and uplink directions as well as the F-DPCH channel are configured with an inner transmit power loop, even if no DPDCH channels exist in the downlink and uplink directions.
  • the object of the invention is to provide a method and components of a radio communication system, which allow a further reduction of the interference caused by control channels in the upward direction and thus an increase in the system capacity.
  • transmissions of control information are interrupted on at least one second channel assigned to the first channel.
  • this interruption of transmissions in the E-DPCCH channel prevents a noise increase at the location of the base station, thereby advantageously increasing the system capacity.
  • the subscriber terminal advantageously remains in the CELL_DCH status, whereby advantageously no time-consuming status change is required.
  • the fact that no user data is transmitted and / or received on the at least one first channel is determined by means of an observation of a respective status of a buffer memory by the base station and / or the subscriber terminal.
  • the base station in
  • the subscriber terminal can also suppress the transmission of control information in the E-DPCCH channel.
  • the fact that no user data is transmitted and / or received on the at least one first channel is determined when no user data is transmitted and / or received by the base station and / or the subscriber terminal during a predetermined time interval.
  • the at least one base station requests the at least one subscriber terminal to interrupt transmissions on at least one associated second channel for the transmission of control information in the upward direction to the at least one base station.
  • This second assigned channel may be the E-DPCCH channel in the above example.
  • the at least one base station for the request to the subscriber terminal uses a code which is not assigned for transmissions of user data and control information. This ensures that the transmission of the request does not have to be assigned a code that is currently being used for other transmissions, which can result in adverse time delays.
  • a code may be a spreading code of the UMTS system after an initial description.
  • transmissions on an assigned second channel in the downstream direction are also interrupted by the at least one base station.
  • neither upstream nor downstream control information is transmitted in the associated second channels.
  • the at least one base station is requested by the at least one subscriber terminal to increase the transmission power for transmissions on the assigned second channel in the downward direction.
  • the base station due to the interruption of the transmission of control information in the uplink direction, which control information required in particular for transmission power control of the transmissions in the downward direction, such as the so-called Transmit Power Command (TPC) of the closed transmission power control loop (Closed Loop Power Control) comprise, has no information about the required for the subscriber terminal transmission power is advantageously ensured by this measure that even with an exemplary removal of the subscriber terminal from the base station at least for a certain period continues to receive a sufficiently good reception of the transmissions of the base station possible is.
  • TPC Transmit Power Command
  • transmissions on at least one associated second channel in the uplink and / or downlink direction are resumed after determining a renewed activity on the at least one first channel.
  • This can be determined by means of an observation of a respective status of a buffer memory by the base station and / or the subscriber terminal after a further development based thereon.
  • the base station and / or the subscriber terminal thus observe the status of the transmission of payload data in the first channel and derive therefrom a need to resume transmissions on the second channel.
  • the at least one subscriber terminal is requested by the at least one base station to resume transmissions on the at least one associated second channel in the upward direction.
  • the at least one base station uses, for example, a code not assigned to transmissions of user data and control information, the code used being, for example, identical to the above-described code for requesting the interruption of transmissions on the at least one embodiment may be an associated second channel.
  • the at least one subscriber terminal transmits transmissions on the at least one first channel and on the at least one associated second channel at the same time.
  • the at least one subscriber terminal transmits at least parts of a data rate request to the at least one base station before or at the same time as transmissions on the at least one associated second channel.
  • the base station can be informed by means of a use of known signaling that the transmissions are resumed on the second channel.
  • the at least one subscriber terminal resumes transmissions on the at least one first channel a predetermined time after the resumption of transmissions on the at least one associated second channel in the upward direction.
  • the base station is thus advantageous upon receipt of the first payload data after resumption of transmission on the first Channel in the knowledge of transmission characteristics on the radio interface to the subscriber terminal, and thus, for example by means of a signaling of transmission power control commands to the subscriber terminal, ensure reception of the user data.
  • the at least one base station after determining transmissions in the at least one associated second channel in the upward direction, the at least one base station requests the at least one subscriber terminal,
  • the base station thus signals the subscriber terminal to resume the transmission of user data on the first channel.
  • the base station can also already signal transmission power control commands to the subscriber terminal so that the subscriber terminal can adapt the transmission characteristics of the radio interface which have changed since the interruptions of the transmissions.
  • the at least one base station resumes transmissions in the at least one first channel in the downward direction.
  • the at least one subscriber terminal After receiving these transmissions of the at least one base station, the at least one subscriber terminal subsequently resumes the transmissions in the at least one first channel in the upward direction. The subscriber terminal thus waits until the reuse of the transmission of user data until it has itself received user data from the base station.
  • a seventh alternative embodiment transmissions on the at least one associated second channel of the base station and / or the subscriber terminal after a predetermined time interval resumed.
  • This predetermined time interval is started by the at least one subscriber terminal and / or the at least one base station according to an embodiment based thereon upon interruption of transmissions on the at least one assigned second channel.
  • a periodicity of the transmission of control information is defined by the predetermined time interval. This means that at least after a respective time interval, control information, such as that used, for example, for the synchronization or the transmission power, is transmitted, and thus mechanisms and methods for maintaining the connection between the base station and subscriber terminal are supplied with required information. If, in the course of the time interval, a resumption of the transmissions occurs due to one of the circumstances described above, the time interval is interrupted accordingly and restarted at the next interruption.
  • the at least one base station requests the subscriber terminal to resume transmissions in the at least one assigned second channel.
  • the subscriber terminal is therefore requested by the base station, after determining the expiration of the time interval, to resume the transmission of control information.
  • the at least one subscriber terminal determines a transmission power required for transmissions in the at least one associated second channel in the upward direction by means of an open transmission power loop. Unless the subscriber terminal does not receive control information, in particular for example transmission power control commands, from the base station, it is based on a channel of the base station, for example a pilot channel whose transmission power is known, in order to determine its own transmission power for the uplink transmissions.
  • control information in particular for example transmission power control commands
  • An inventive radio communication system has components, in particular a base station and a subscriber terminal, which are each equipped with means for performing the method according to the invention as described above.
  • UL DPCCH uplink direction
  • DL DPCCH downlink direction
  • F-DPCH F-DPCH
  • the method according to the invention is divided into a plurality of steps explained in more detail below, which, if appropriate, can also be implemented independently of one another.
  • a first step the determination that no user data is transmitted in the upward and / or downward direction is considered.
  • a second step concerns the interruption of transmissions in control channels.
  • the third step looks at the resumption of transmissions in the control channels, this step being divided into two sub-steps, on the one hand, procedures for resuming the transmissions and, on the other hand, determining the transmission power for the control channels, for example the UL DPCCH, upon resumption of the transmissions affect.
  • a determination that no payload data is to be transmitted or transmitted in the uplink and / or downlink can be made as follows. Firstly, the base station itself can detect the absence or absence of payload data to be transmitted in the downstream direction Determine subscriber terminal by observing the status of the so-called MAC-hs buffer memory (English Buffer), in which payload data before transmission over the radio interface are cached. Similarly, the subscriber terminal may determine an absence or absence of payload data to be transmitted in the upward direction to the base station by observing the status of the so-called MAC e-buffer memory.
  • MAC-hs buffer memory English Buffer
  • the subscriber terminal may be configured such that it communicates with the base station for example by means of a so-called Scheduling Information signals that the buffer is empty.
  • Scheduling Information signals that the buffer is empty.
  • the absence or absence of user data to be transmitted may be detected if no new user data is present during a predetermined time interval received in the uplink and / or downlink direction.
  • the absence or absence of payload data in the uplink and downlink directions is determined by the base station according to the first step. If so, the base station requests the subscriber terminal to interrupt both transmissions on the control channel UL DPCCH and on the control channel HS-DPCCH. This can be done, for example, by means of a command transmitted at the physical layer (Layer 1), for example using one of eight code words of the HS-SCCH channel which are not used according to the current status of the standard.
  • Layer 1 physical layer
  • a transmission of the command should preferably take place only after a certain time interval, ie after no new user data for transmission over a predetermined period of time to ensure that the DPCCH and HS-DPCCH channels are not interrupted in the upward direction already at short interruptions of the user data transmissions ,
  • the subscriber terminal suspends transmissions in the DPCCH channel in the upward direction if no payload data is received in the downlink direction or in the uplink during a predetermined time interval were.
  • the interruption of the control channel in the downward direction is carried out according to the second step, for example, as follows. After the subscriber terminal has interrupted the transmissions in the control channel (s) in the uplink direction, the base station also interrupts the transmissions in the DPCCH or F-DPCH control channel in the downlink direction, depending on which of these two channels is established.
  • the base station can not interrupt the transmissions in the DPCCH or F-DPCH control channels, but for example signal a transmission power control command "UP" to the subscriber terminal, so that it transmits the transmission power when the transmissions are resumed
  • the base station can also increase its transmission power for the DPCCH or F-DPCH control channel in order to ensure reception of this channel by the subscriber terminals located within the radio cell supplied by the base station.
  • the third step is divided into two sub-steps, with the first sub-step, which describes the method for resuming the transmissions, first of all being discussed below.
  • the requirement for resumption of the downlink transmission to the subscriber terminal can be found in the base station. tion, for example, by monitoring the status of the MAC-hs buffer.
  • the subscriber terminal can be informed by the base station, for example by means of explicit signaling, from which the subscriber terminal derives the necessity of resuming transmissions in the DPCCH and HS-DPCCH control channels in the upward direction.
  • the base station again uses one of the eight currently unused HS-SCCH codewords, in conjunction with the first alternative of the second described above
  • Step 2 after the signal for the interruption has already been used such a codeword, the same codeword can be used. This would then serve to switch back and forth between the two states of interruption / resumption.
  • the base station may also resume transmissions in the DPCCH or F-DPCH control channel in the downlink direction if it has previously been deactivated or transmissions interrupted as described above.
  • the requirement of resuming transmission in the upward direction to the base station can be determined by the subscriber terminal, for example, again by observing the status of the MAC-e buffer memory. After that, the subscriber terminal resumes the transmissions in the DPCCH control channel in the upward direction, for example.
  • the transmission power used for this purpose determines the subscriber terminal according to one of the methods described in the second sub-step.
  • the subscriber terminal starts to transmit payload data in the upward direction in parallel. IeI to the resumption of the transmissions in the DPCCH control channel in the upward direction.
  • first data packets with user data are likely to be lost.
  • ARQ protocols are, for example, the so-called fast HARQ protocol for the E-DCH or the so-called RLC-ARQ protocol for the normal DCH.
  • the subscriber terminal first transmits a so-called rate request to the base station before starting the transmission of payload data in the upward direction unless it is non-scheduled ) Transfers. For example, similar to the first strategy, the subscriber terminal sends this request in parallel with resumed transmissions in the DPCCH control channel in the uplink direction. In the event that the base station does not receive this request or does not notice the fact that a packet has been received, subsequently a retransmission can again be requested, for example by means of a HARQ protocol.
  • the data rate request may also be transmitted several times, with the transmission power being increased in a repeated transmission in order to increase the reception reliability of the base station.
  • the subscriber terminal can search for a
  • the strategy also only transmits the E-DPCCH control channel.
  • TFCI Transport Format Configuration Indicator
  • MAC-PDU Packet Data Unit
  • the MAC PDU is highly unlikely to be received by the base station
  • transmission of only the TFCI results in an advantageous reduction in the interference caused by the E-DPDCH channel.
  • the transmission of the TFCI appears to be sufficient to signal the base station the pending transmissions in the uplink direction. The missing PDU would be considered by the base station as an erroneous detection and accordingly request a retransmission.
  • an explicit trigger for the resumption of transmissions can also be defined.
  • the subscriber terminal begins to transmit payload data upwardly after transmitting a predetermined number of slots of the DPCCH control channel in an uplink direction.
  • the base station detects signals of the DPCCH control channel in the upward direction with a required reception quality. This then, for example, again using one of the eight codewords of the HS-SCCH channel, which are unused according to the current specification, requests the subscriber terminal to resume the transmissions in the D-DPCH channel.
  • the base station detects signals from the subscriber terminal in the uplink direction and resumes the previously interrupted transmission in the DPCCH or F-DPCH channel in the downlink direction. These transmissions in turn detect the subscriber terminal and interprets this as a trigger for the resumption of transmissions on the E-DPCH channel.
  • the base station in turn resumes the transmissions in the DPCCH or F-DPCH channel in the downstream direction after signals from the subscriber terminal, for example in the DPCCH alone or both in the DPCCH and the E-DPCH channel in Up direction were detected, and this was previously interrupted.
  • the resumption of transmissions on the control channels can also be controlled by the expiration of a time interval.
  • a timer controlling this time interval can be realized both in the base station and in the subscriber terminal, or in both. After expiration of the time interval in the base station, the latter requests the subscriber terminal, for example by means of a message on the physical layer, to resume the transmissions on the DPCCH control channel in the upward direction. If the base station also interrupted transmissions on the DPCCH or F-DPCH control channel in the downlink direction, it will also restart transmission in that channel. For example, one of the currently unused codewords of the HS-SCCH channel can be used as the message.
  • the user terminal can autonomously initiate a resumption of the transmissions in the DPCCH control channel in the upward direction, unless it has already come to it during the time interval due to other causes.
  • the subscriber terminal should determine a transmission power for the transmission of the first slot of the DPCCH control channel in the upward direction according to a so-called open transmission power control loop. This will be explained in more detail below with regard to the second sub-step. wrote.
  • the subscriber terminal may signal the base station, for example by means of a message on the physical layer, of the cause of the resumption of the transmissions in the DPCCH control channel in the upward direction.
  • the second sub-step of the third step mentioned concerns the determination of the transmission power for the control channels, for example the DPCCH control channel in the upward direction, when resuming the transmissions. Since, after interruption of the transmission of control information, in particular transmission power control commands, in the upward direction no inner power control loop can be maintained, the subscriber terminal should first itself determine a required transmission power for the DPCCH control channel to reinitialize this closed loop then start an optionally modified inner transmit power control loop based thereon.
  • DPCCH_Initial_power H s Slot of the DPCCH control channel in the upward direction after an interruption, hereinafter referred to as DPCCH_Initial_power H s, for example, can be calculated as follows.
  • Radio Network Controller RNC
  • / or - Broadcast data broadcast by the base station or the radio access network UTRAN RNC
  • the first transmission power of the subscriber terminal is determined without consideration of upward interference.
  • the subscriber terminal calculates the transmission power according to the following equation, which represents an adaptation of the equation in Chapter 8.5.3 of the Technical Specification 3GPP TS 25.331 V6.6.0:
  • DPCCH_Initial_jpower HS - P-CPICH_RSCP + DPCCH_Power_offset HS ,
  • P-CPICH_RSCP as an average receive level of the serving radio cell, i. the base station
  • DPCCH_Power_offset H s as a transmit power offset defined by the network.
  • the value of this transmit power offset is assigned to the subscriber terminal for example by the radio network controller by means of a so-called RRC message, which is also used for the assignment of HSDPA and E-DCH resources to the subscriber terminal.
  • the first transmission power of the subscriber terminal is determined taking into account information transmitted on a broadcast channel (BCH) about an interference situation in the uplink direction.
  • BCH broadcast channel
  • the subscriber terminal calculates the transmission power according to the following equation, taking into account the broadcast interference information.
  • DPCCH_Initial_power HS P-CPICH Tx power - P-CPICH_RSCP + UL Interference + Offset H s
  • the factor P-CPICH Tx power is a transmit power of the P-CPICH channel at the location of the base station, which is signaled to all subscriber terminals as broadcast data or system information;
  • P-CPICH_RSCP is an average reception level of the serving radio cell;
  • P-CPICH Tx power - P-CPICH_RSCP describes downlink attenuation between the base station and the subscriber terminal;
  • UL interference is an uplink interference observed by the base station, which in turn is signaled as broadcast data or system information to all subscriber terminals;
  • Offset H s is a correction factor defined by the radio network (UTRAN).
  • the first transmission power of the subscriber terminal is determined in consideration of information broadcast on the HS-SCCH channel about interference in the upward direction.
  • the base station informs the subscriber terminal about changes in the interference value in the upward direction.
  • two of the eight currently unused codewords of the HS-SCCH channel can be used for this purpose.
  • a first codeword would be transmitted by the base station to inform all subscriber terminals in the radio cell of the base station that the observed interference at the location of the base station has risen by a value ⁇ .
  • the second codeword would be used accordingly to signal a decrease of the observed interference by a value - ⁇ to the subscriber terminals.
  • the subscriber terminal may calculate the required transmit power according to the following equation:
  • DPCCH_Initial_power HS - P-CPICH_RSCP + ⁇ .
  • the subscriber terminal may not have received all HS-SCCH code words regarding the change in interference. Since the calculation of the value ⁇ with longer residence time in the radio cell of the base station thus becomes increasingly inaccurate, for example, a third code word of the HS-SCCH channel can be used for the value ⁇ for all subscriber terminals in the radio cell, for example after a certain Time interval, reset.
  • the user terminal After the transmission of the first slot of the DPCCH channel in the upward direction with the calculated transmission power, the user terminal restarts the inner transmission power control loop.
  • the user terminal regulates the transmission power for subsequent transmissions in the DPCCH control channel in the upward direction in accordance with the received transmission power control commands of the radio cells of the so-called tive set of radio cells.
  • An adaptation of the transmission power thereby takes place according to the step size specified by the network (UTRAN), or alternatively, at least during a specific time interval, with a larger step size for a faster increase of the transmission power of the DPCCH control channel in the upward direction.
  • the transmission power is increased by three dB when a transmission power control command "UP" has been received, while a reduction in transmission power after receiving a transmission power command "DOWN" by only -1 dB occurs.
  • the network can, for example, define a limit value for a maximum transmission power with which the subscriber terminal can transmit transmissions in the DPCCH control channel in the uplink direction without receiving commands from the base station (s).
  • Subscriber terminal in the upward direction it sends signals in the DPCCH or F-DPCH control channel to the subscriber terminal, for example, with a transmission power, which can be potentially received by all subscriber terminals in the radio cell of the base station.
  • the radio network controller can also be informed that transmissions in the uplink and / or downlink direction are interrupted. The same applies if, for example, a resumption of the transmissions in the upward and / or downward direction is detected by the base station.
  • the subscriber terminal can, for example, the so-called internal measurements (UE internal measurements), as described in Chapter 14.6 of the Technical Specification 3GPP TS 25.331 V6.6.0 are not described.
  • the measurement events relating to the transmission power of the subscriber terminal can be estimated, for example, according to the equation in the preceding second example for the third step.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de commande de transmissions de signaux dans un système de radiocommunication, selon lequel on créée au moins un premier canal pour la transmission de données utiles et au moins un deuxième canal associé au premier canal et destiné à la transmission de données de commande entre une station de base du système de radiocommunication et au moins un terminal d'abonné. En l'absence de données utiles envoyées et/ou reçues sur le ou les premiers canaux, les transmissions sont interrompues sur le ou les deuxièmes canaux associés.
PCT/EP2006/008408 2005-08-26 2006-08-28 Procede de commande d'une interruption de transmissions pour reduire les interferences dans un systeme de radiocommunication WO2007023000A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05018613 2005-08-26
EP05018613.9 2005-08-26

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999038278A1 (fr) * 1998-01-24 1999-07-29 Samsung Electronics Co., Ltd. Procede de communication de donnees dans un systeme de communication mobile
US20040087306A1 (en) * 1999-01-16 2004-05-06 Moulsley Timothy J. Radio communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999038278A1 (fr) * 1998-01-24 1999-07-29 Samsung Electronics Co., Ltd. Procede de communication de donnees dans un systeme de communication mobile
US20040087306A1 (en) * 1999-01-16 2004-05-06 Moulsley Timothy J. Radio communication system

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