• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    BASE STATION AND METHOD OF OPERATING A BASE STATION. The invention relates to a base station (100) for a cellular communications network, wherein said base station (100) is configured to control at least one antenna system (110), which comprises a plurality of antenna elements (110a, 110b, 110c, ..., 110n), in which at least two antenna elements (110a, 110b) are arranged in different vertical positions (PA, PB) with reference to a horizontal virtual plane (P). The base station (100) is further configured to transmit specific pilot signals (D1, D2) over the orthogonal radio resources associated with said specific pilot signals (D1, D2), through different antenna elements (110a, 110b).
    公开号:BR112013012864B1
    申请号:R112013012864-0
    申请日:2011-11-21
    公开日:2021-02-23
    发明作者:Stephan SAUR；Hardy Halbauer
    申请人:Alcatel Lucent；
    IPC主号:
    专利说明:

    Field of invention
    The present invention relates to a base station of a cellular communications network, in which said base station is configured to control at least one antenna system comprising a plurality of antenna elements, in which at least two antenna elements they are arranged in different vertical positions with reference to a virtual horizontal plane.
    The invention also relates to a method of operating a base station of the type mentioned above.
    The present invention also relates to a terminal on a cellular communications network and a method for operating such a terminal. Background
    Antenna systems that are equipped with a plurality of vertically arranged antenna elements that can be individually fed with respective transmission signals allow to adjust a beam pattern resulting from the antenna system in the vertical direction, in a manner known per se. For example, by applying a specific signal to an antenna element, prior to such an antenna system, and by applying phase-shifted copies of said first signal to the supplementary antenna elements, an angle of inclination of the antenna system can be controlled electronically.
    However, conventional approaches do not provide an effective determination of a tilt angle, which is to be used by the base station for data communications with the terminals.
    Therefore, there is a need to provide an improved base station and method of operating such a base station, which ensures an effective determination of an angle of inclination to be used for communication. In addition, another objective of the present invention is to provide a terminal for a cellular communications network, which supports the above-described operation of the base station. summary
    In accordance with the present invention, in relation to the aforementioned base station, this objective is achieved by said base station being configured to transmit specific pilot signals on the orthogonal radio resources associated with said specific pilot signals through others other than those at least two antenna elements.
    Employing orthogonal radio resources for the transmission of pilot signals from the base station to one or more terminals, it advantageously allows the terminals to retrieve each individual pilot signal, thus increasing efficiency in synchronizing the terminal with the base station and operating flexibility which may, for example, involve determining a desired angle of inclination.
    In contrast to conventional base stations, which do not employ orthogonal radio resources for the transmission of specific pilot signals through different antenna elements, the embodiments of the invention advantageously allow a terminal to determine the phase shifts between the different specific pilot signals that have been transmitted through the system of antenna elements other than the base station antenna from the base station to the terminal. Thus, from the phase shift information, the terminals can advantageously obtain information about an optimized inclination angle that can, in the future, be used by the base station, in order to reshape the vertical beam pattern of their system. antennas, in order to center it, that is, on the direction of the terminal, as seen from the base station.
    A particularly preferred embodiment proposes that said base station is configured to transmit a) a first pilot signal on a first radio resource through a first element of the antenna, and b) a second pilot signal on a second radio resource, which is orthogonal said first radio resource, by means of a second antenna element. Thus, through the use of different antenna elements for said two pilot signals, it is ensured that information about a phase shift between the pilot signals can be transferred to the terminal. Said phase shift depends, inter alia, on the wavelength used for radio frequency communication signals (ie, pilot signals), and on constructive parameters of the antenna system (vertical distance from neighboring antenna elements).
    The use of orthogonal radio resources is particularly advantageous since it allows, for example, simultaneously to provide the terminal with a plurality of pilot signals without loss of phase information from the specific pilot signals, which is vital for the evaluation of an angle of desired slope for data communication between the base station and the terminal.
    According to another advantageous embodiment, said base station is configured to use at least one of the following resources as orthogonal radio resources: transmission time slots, subcarriers, orthogonal codes. Generally, any type of radio resources or coding techniques can be used that ensures that the specific pilot signals, which are transmitted through different antenna elements, can be retrieved at a terminal while maintaining their phase information. That is, employing orthogonal radio resources, in the sense of the present invention it comprises any form of transport and / or coding, which guarantees that the individual recovery and manipulation of specific transmitted pilot signals through different antenna elements is possible on the side of the terminal. Thus, conventional antenna systems, which are capable of guiding the beam, for example, by providing different antenna elements with examples of displaced phase of the same input signal, are not suitable for the application of the present embodiments since no features Orthogonal radio is provided, due to the simultaneous transmission of outdated signal instances via various elements of the antenna. These transmissions do not activate a terminal to retrieve specific pilot signals associated with a single of the aforementioned antenna elements.
    According to another embodiment, said base station is configured to transmit a first pilot signal via a first antenna element during a first downlink transmission time interval, and to transmit a second second pilot signal via a second antenna element for one second, preferably subsequent, downlink transmission time interval. In this embodiment, a time multiplexed transmission of the different pilot signals is used, that is, the "orthogonality" of the radio resources - in the sense of the present invention, - used for the different pilot signals is ensured through the use of time multiplexing. Preferably, during the transmission of the pilot signal through a first element of the first antenna, the antenna elements of the other said antenna system is controlled to be passive, that is, it does not transmit any signals. The same is true for the transmission of additional pilot signals. Thus, the respective time slots are reserved for transmitting the pilot signals.
    To maintain sufficient accuracy in relation to an evaluation of a phase shift between the pilot signals received on the terminal side, which is advantageous for the base station for transmitting pilot signals associated with the different antenna elements, with the minimum possible delay in the middle, that is, preferably at subsequent downlink transmission time intervals.
    However, if the base station determines that the relative speed between the specific terminal and the base station does not exceed a predefined threshold value, it is also possible to allow for longer delays between the transmission of subsequent pilot signals that are transmitted through different antenna elements, because the phase delay measurements of pilot signals received from different antenna elements on the terminal side are not significantly affected, due to the low relative speed.
    According to another embodiment, said base station is configured to transmit a first pilot signal via a first antenna element on a first subcarrier, and to transmit a second pilot signal through a second antenna element on a second subcarrier , wherein said first and second pilot signals are preferably transmitted simultaneously.
    According to the present embodiment, frequency subcarriers are employed as "orthogonal radio resources", which, advantageously, allows the terminal that is receiving the pilot signals transmitted by different antenna elements to retrieve the specific pilot signals, including the your phase information. In contrast to the multiplexed transmission time of several different pilot signals, the present embodiment allows different pilot signals to be transmitted simultaneously, employing several different frequency subcarriers. However, in order to ensure that sufficient phase information to determine an optimum tilt angle for base station transmissions can be transmitted to the terminal, different pilot signals have yet to be transmitted via different system antenna elements. antenna.
    According to another advantageous embodiment, said base station is configured to transmit a first pilot signal via a first antenna element using a first propagation code, and to transmit a second pilot signal via a second antenna element using a second propagation code, which is orthogonal to said first propagation code, wherein said first and second pilot signals are preferably transmitted simultaneously.
    In accordance with the present embodiment, code division multiplexing is employed to ensure that the plurality of pilot signals can be transmitted from the base station to one or more terminals, without interfering with each other.
    The combination of the aforementioned variants employs orthogonal radio capabilities to provide a terminal with a plurality of pilot signals via antenna elements other than the base station is also possible, as long as the various techniques do not interfere with each other.
    According to a particularly advantageous additional embodiment, the first pilot signal is identical to the second pilot signal. This allows an effective detection of the pilot signal inside the terminal and a correspondingly effective determination of phase information that characterizes the phase difference of the different pilot signals that have been transmitted to the terminal through different antenna elements of the base station.
    Alternatively or in addition, different pilot signals can also be used, where, as usual, it is necessary to ensure that both the receiving terminal and the base station include information on the properties of the respective pilot signals.
    According to another embodiment, the base station is configured to receive the feedback information from a terminal, wherein said feedback information depends on or characterizes a phase shift between said pilot signals as detected by said terminal, and to control a tilt angle for the transmission of downlinks and / or uplink to / from said terminal according to said return information.
    The phase shift (s), determined by a terminal that received several pilot signals that were transmitted by a base station in accordance with the embodiments, can advantageously be employed to draw conclusions about the preferred tilt angle of the base station's antenna system, that is, the shape of the vertical beam pattern implemented by the antenna system under the control of the base station. That is, from the phase shift, the terminal (and / or the base station) can determine an angle of inclination of the individual terminal that is being executed by the base station for future downlink / uplink data transmissions to said terminal, in order to ensure that all transmission signals originating in the antenna elements other than the antenna system arrive at said phase terminal with basically no relative phase difference. This situation is given if the angle of inclination of the antenna system is configured in such a way that a direction of a main lobe of the antenna characteristic of the antenna system coincides with the direction of the respective terminal, as seen from the base station. In other words, by evaluating the phase change information of the received pilot signals, an optimal tilt angle can be calculated, which will centralize the main lobe of the beam antenna system pattern to the terminal that determined the information. phase change. The calculation of the tilt angle can be performed by a terminal and / or the base station. It is evident that at least two pilot signals (each being transmitted from another antenna element) have to be evaluated to determine the said optimal angle of inclination. More than two pilot signals (for example, involving transmissions from other antenna elements) can also be used to increase accuracy.
    According to the particularly advantageous embodiment, said feedback information depends on the phase shift between the different pilot signals as received by the terminal and is determined locally within the terminal.
    After receiving the return information from a respective terminal, a base station according to the embodiments can reshape the vertical beam pattern of its antenna system for the transmission of future data to the respective terminal in order to implement the angle desired slope.
    According to another advantageous variant, the tilt angle of the antenna base station system can not only be set to a desired value for downlink transmissions, but also for uplink transmissions. That is, for receiving data communications from a terminal, the base station can also configure its antenna system, respectively, in relation to an angle of inclination. Due to the reciprocity of the radio channel between the base station and the terminal, the base station can advantageously use the same tilt angle for uplink data transmissions, as has been determined for downlink data transmissions.
    However, according to another embodiment, it may also be advantageous to use different angle values for uplink transmissions and downlink transmissions with a specific terminal. For example, if a terminal currently served by a base station of the first is roaming inside the radio cell provided by the base station, the terminal can happen to move away from its base station it serves, that is, by going to a cell neighboring radio station served by an additional base station. In this case, it may be advantageous to limit to a tilt angle to be implemented by the antenna system of the first base station, in order to reduce inter-cell interference that can be introduced by directing a main lobe of the antenna system's beam pattern. to the neighboring radio cell. Thus, even if the response information is provided by a terminal positioned on the edge of the cell, it would be necessary to provide a specific first angle of inclination by the base station, it may be advantageous to limit the angle of inclination that is effectively applied to such values that ensure that a amount of inter-cell interference is kept below a predetermined threshold value.
    However, in the case of uplink data transmission, the base station can implement said first tilt angle, that is, the desired tilt angle as derived from the phase shift measurements of the terminal, since due to the uplink transmission scenario, it is ensured that no inter-cellular interference is produced in relation to the neighboring cell, and on the other hand, the distance to the neighboring base station is comparatively large, so that the first base station will not receive any interference signals too much of the cell's border region.
    According to another embodiment, the base station is configured to periodically transmit said pilot signals, in which a time interval between two subsequent pilot signal transmissions from the same antenna element intervals between about 1 millisecond and about 20000 milliseconds, preferably between 10 milliseconds and 1000 milliseconds. As explained above, when using time-multiplexed transmission of different pilot signals, it is advisable to transmit subsequent pilot signals through different antenna elements, without substantial delays between them in order to minimize a phase error that can be introduced by a non-zero relative speed between the base station and the terminal. However, to the extent that different subsequent cycles of transmission of a plurality of pilot signals are concerned, it is sufficient to repeat such cycles within, for example, 10 milliseconds or even longer intervals, such as up to 1000 milliseconds or more. A cycle of pilot signals advantageously ensures that the terminal is able to retrieve the phase information that can be used to determine a desired angle of inclination. However, due to the trigonometric relationship between the desired angle of inclination and a phase delay between pilot signals received from different antenna elements, a period of time between subsequent pilot signal cycles may well be in the 1000 millisecond range because, in the case of low relative speeds between the base station and the terminal, no substantial offset from the optimum tilt angle is to be expected between subsequent pilot signal cycles.
    Thus, it is sufficient to carry out the steps of the method according to the embodiments over time, for example, within a cycle of 1000 milliseconds, to allow a sufficiently accurate determination of the optimum inclination angles. Advantageously, longer pilot signal cycle times allow for increased user data transmission capacity.
    Another solution for the object of the present invention is provided via a terminal for a cellular communication network according to claim 11. The terminal is configured to determine a phase shift between said pilot signals and to transmit feedback information to said base station, wherein said feedback information depends on or characterizes said phase shift between said pilot signals as determined by said terminal. This advantage allows the base station to apply a tilt angle for future data communications with the terminal that lead to optimal signal quality. Advantageously, the base station can determine and / or implement the specific tilt angle values for individual terminals or groups of terminals co-located within the radio cell served by the base station based on phase shift measurements.
    According to another embodiment, the terminal is configured to transmit phase shifts between the determined pilot signals received from the base station. Within this embodiment, the amount of signal processing related to determining the angle of inclination within the terminal is minimized. However, based on information received from phase shift from the terminal, the base station must evaluate the desired tilt angle for future communication with the terminal based on the respective geometric properties of the antenna system (ie, the vertical distance from neighboring antenna elements).
    Alternatively or in addition, the terminal can be configured to determine a desired tilt angle for downlink / uplink transmissions from the base station to the terminal according to the phase shift and to transmit the desired tilt angle value to the base station. In this case, therefore, the terminal must perform the respective calculations that require the terminal to understand information about the parameters of the antenna system used by the base station (for example, the vertical distance of neighboring antenna elements).
    According to another embodiment, the terminal can also be configured to determine an index value that denotes one of a plurality of predefined tilt angle values that can be used by the base station, which relates to the phase shift. determined and transmit the index value to the base station. In contrast to the transmission of the phase shift values or a determined tilt angle, the index value requires only a reduced amount of transmission capacity in the uplink direction. However, compared to simply transmitting determined phase shifts to the base station, a greater degree of signal processing within the terminal is required.
    According to another embodiment, the terminal is configured to receive pilot signals from more than one additional base station of the cellular communications network, to determine a phase shift between said additional pilot signals, and to transmit feedback information on said second additional phase shift to said base station. In other words, the basic principle of the embodiments is applied not only to pilot signals received by the terminal from its base station in service, but also to pilot signals received by neighboring base stations. This advantageously allows the terminal to identify the inclination angles of neighboring base stations that are undesirable as they conduct interference effects (inter-cell interference), due to transmissions from the neighboring base station to the terminal. After receiving such information, the base station serving the terminal can exchange programming information with its neighboring base station, that is, by notifying the neighboring base station not to use specific inclination angles that result in said inter-cell interference , as reported by the terminal.
    Additional solutions for the objects of the present invention are provided by a method of operating a base station according to claim 14 and a method of operating a terminal according to claim 15. Brief description of the figures
    Additional aspects, characteristics and embodiments of the present invention are presented in the following detailed description, with reference to the drawings, in which:
    Figure 1 shows a simplified block diagram of a base station according to one embodiment, Figure 2 represents a simplified block diagram of an antenna system of a base station according to an additional embodiment, Figure 3 represents a map of radio time / frequency resources according to another embodiment, and Figure 4 illustrates a simplified flowchart of a method of operating a base station according to one embodiment. Description of the achievements
    Figure 1 shows a simplified block diagram of a base station 100 on a cellular communications network. Base station 100 can serve a number of terminals (not shown), such as mobile user terminals, by maintaining respective data communication sessions in a manner known to you. For example, base station 100 can operate according to at least one of the following standards: GSM (Global System for Mobile Communications), UMTS (Universa! Mobile Telecomunication System), LTE (Long Term Evolution) I LTE Advanced, WiMax (Worldwide Interoperability for Microwave Access), WLAN (Wireless Local Area Network).
    The base station 100 comprises an antenna system 110, a characteristic beam pattern that is symbolized by the shape 111. According to one embodiment, the antenna system 110 can be controlled electronically to reconfigure its beam pattern 111 or, at least , a direction of the main lobe of the beam pattern 111 along which the axis of the main lobe 112 extends on a per-terminal basis. That is, the angle of inclination θ of the antenna system 110, more precisely of its main lobe 111, which - as can be seen from figure 1 - is defined as the angle between the axis of the main lobe 112 and a virtual horizontal plane P ' , can be electronically controlled, preferably individually for each terminal. This is achieved, for example, by means of processing 120, which also controls the basic operation of the base station 100 in a manner known to you. In addition, the processing means 120 can also be configured to carry out the method according to the embodiments explained below with reference to the additional figures. Although the processing means is symbolized by a function block 120 which is arranged inside the base station 100, in the context of the present exemplary embodiment, it is also possible to provide at least a part of the functionality of the processing means 120 within a additional functional unit (not shown), which may, for example, be located close to the antenna system 110, such as, for example, a feeder network or the like.
    Figure 2 represents a detailed view of the antenna system 110 according to the embodiments. The antenna system 110 comprises many n individual antenna elements 110a, 110b, 110c, 110n which can, for example, be designed as dipole antenna elements. The power network (not shown) can also be provided with the antenna system 110, which allows the base station 100 (Figure 1) to individually provide each antenna element 110a, 110b, 110c of the antenna system 110 with a signal specific radio frequency to be transmitted through the respective antenna element.
    As can be seen from figure 2, the antenna elements 110a, 110b, 110c, ..., 110n of the antenna system 110 are arranged in different vertical positions pa, pb, pc, pn, which are listed on an axis vertical p_v, for illustration purposes. The vertical distance Δx between the different antenna elements can, for example, be defined in relation to a horizontal virtual plane P, which is also shown in figure 2.
    In the context of the present invention, the term "antenna element" is defined as a single dipole or a group of dipoles or other types of antenna structure, rather than dipoles. Generally, a dipole can exhibit different directions of polarization. Especially a pair of two cross-polarized dipoles can also be understood as an "antenna element" in the context of the present invention. In contrast, antennas that form conventional antenna systems, for example, for forming a horizontal beam, are not "antenna elements" in the sense of this description. Such conventional antennas are already groups of vertically arranged antenna elements, which normally do not can be fed independently.
    Figure 2 also shows a terminal 200, which can be served by base station 100 (figure 1), which controls the antenna system 110. As can be seen from figure 2, due to its vertical orientation in relation to the other, a connecting line between the individual antenna elements 110a, 110b, 110c 110n for the receiving antenna of the terminal 200 which comprises different lengths for the different antenna elements, according to the dashed arrows of figure 2.
    As a consequence, a signal that is transmitted, for example, through the second antenna element 110b of the antenna system 110 to the terminal 200 comprises a phase change in relation to a signal that is transmitted from the first antenna element 110 of the antenna system 110 for terminal 200. That is, the respective signals received at terminal 200 comprise a phase shift between them, which corresponds to the distance between the antenna of terminal 200 and the respective antenna elements 110a, 110b. The phase shift between the signals received by the terminal antenna from the antenna elements 110a, 110b of the base station 100 is related to the vertical distance Δx between the neighboring antenna elements, 110a, 110b and a distance between the terminal 200 and the antenna system 110 in a manner known to you. The distance between the elements 110, 200 can also be determined, for example, via the base station 100, in a manner known to you, for example, by evaluating the forward or backward data of the roundtrip signal or the like .
    When operating base station 100 (figure 1), it is advantageous to provide an angle of inclination other than zero θ (also called "downtilt"), in order to optimally supply a specific terminal 200 (figure 2) with a specific RF downlink signal used for data transmission. For example, if terminal 200 is very close to base station 100, a large tilt angle 0 may be advantageous, since, for situations where terminal 200 is relatively far from base station 100, a smaller tilt angle 0 is enough. As already explained above, the tilt angle 0 is controlled by the base station 100 or its control unit 120, respectively, by providing individual RF transmission signals to the various elements of the antenna 110a, 110b, .. a way you know.
    To determine the value of the specific tilt angle, which should be used when communicating with a specific terminal 200, according to the embodiments, the base station 100 transmits specific pilot signals to the terminal 200 in a manner explained below, which allows terminal 200 to derive the information at an optimal tilt angle.
    The base station 100 is configured to transmit specific pilot signals over the orthogonal radio resources associated with said specific pilot signals through different antenna elements. In this way, that is, through the transmission of different pilot signals via different antenna elements of the antenna system 110 (Figure 2), it is ensured that the terminal 200, which receives the said pilot signals, can recover the different pilot signals, along with its phase information, which allows terminal 200 and / or base station 100 to derive an optimal tilt angle for future downlink transmissions from it.
    For example, a first pilot signal can be transmitted from base station 100 via the first antenna element 110a to terminal 200, while a second pilot signal can be transmitted from base station 100 via the second antenna element 110b to terminal 200. Since terminal 200 knows all the pilot signals that can be used by base station 100, it can detect the pilot signals and determine a phase difference between the (at least two) pilot signals. The phase difference thus determined comprises information about an angle of inclination that is optimal to be implemented by the antenna system 110 and optimally provides the terminal 200 with a downlink signal, for example, to direct the main irradiation axis 112 (figure 1 ) from the antenna system 110 to the position of terminal 200.
    According to a particularly preferred embodiment, said base station 100 is configured to transmit a first pilot signal on a first radio resource through a first antenna element 110a, and a second pilot signal on a second radio resource, which is orthogonal to said first radio resource, through a second antenna element 110b. The orthogonality of the radio resources is advantageous in that it allows the terminal 200 to retrieve the pilot signals from the respective different antenna elements 110a, 110b, while maintaining their phase relationship thus allowing to determine, in an efficient manner, an angle ideal slope 0.
    According to a particularly preferred embodiment, a transmission time slot can be used as an orthogonal radio resource by the base station 100.
    For example, if the base station 100 and terminals 200 operate in accordance with an orthogonal frequency division multiplexing (OFDM) system with time-frequency capabilities as exemplified in Figure 3, a first pilot signal can be transmitted from from base station 100 to terminal 200 via a first time band and a first antenna element 110a (Figure 2), while a second pilot signal can be transmitted from base station 100 to terminal 200 via a second element additional antenna 110b, that is, subsequent to the transmission time range ts2.
    Generally, the time-frequency resource map in figure 3 shows on a time axis a_t the various later time bands ts1, ts2, ts3, while frequency subcarriers are symbolized by the scheme in figure 3 in a line-type manner, or that is, each row in the table represented in figure 3 corresponds to a specific frequency subcarrier, as indicated by the frequency axis a_f. For example, the scheme according to figure 3 shows a total number of eight sub-carriers of frequencies sd, sc2, ... only two of which are expressly designated for the sake of clarity.
    According to a preferred embodiment, in a first downlink transmission time range ts1, base station 100 (figure 1) transmits a first pilot signal D1 on the second subcarrier sc2 and the seventh subcarrier. This transmission is carried out, for example, through the first antenna element 110a of the antenna system 110 (figure 2).
    Subsequently, in the next downlink transmission time slot ts2, a second pilot signal D2 is transmitted from base station 100 to terminal 200 via a different antenna element, for example, the second antenna element 110b. As can be seen from figure 3, within the second transmission time range ts2, the same subcarriers (second and seventh frequency subcarriers) are used for the transmission of the respective second pilot signal D2 to terminal 200.
    After receiving the first and second pilot signals D1, D2, which, for example, can be represented by the dashed arrows of figure 2 that extend from the antenna elements 110a, 110b to the antenna of terminal 200, terminal 200 can advantageously evaluate the phase difference between the known pilot signals received D1, D 2. When determining the phase difference, terminal 200 can directly return said phase shifts (phase differences) between the received pilot signals D1, D2 to the station base 100, in the sense of return information. From such feedback information, base station 100 can calculate an ideal downtilt θ, which should be used for data transmission to terminal 200 to ensure the minimized relative phase shift between different signals transmitted from each of the antenna elements 110a, 110b for terminal 200, i.e., the alignment of the main direction of propagation of the main lobe 111 (figure 1), with the direction of terminal 200 in a vertical dimension. The details of determining the ideal downtilt © depending on a phase shift of different pilot signals as detected by terminal 200 and the vertical distance Δx from neighboring antenna elements, 110a, 110b, ... are based on elementary trigonometry and therefore , not presented in the present context.
    Alternatively or in addition to transmitting the determined phase shift information from base station 100, terminal 200 can also determine a desired tilt angle © for downlink transmissions from base station 100 to terminal 200, depending on the phase shift itself and can transmit such a desired tilt angle to base station 100. In this case, base station 100 is only needed to implement the respective tilt angle, via its antenna system 110.
    Alternatively or in addition, terminal 200 may also determine an index value that denotes one of a plurality of predefined tilt angle values which are both known for base station 100 and terminal 200 and which relate to the phase shift determined. The terminal can transmit such an index value to base station 100 to notify base station 100 of the specific tilt angle to be implemented for data transmission in the future.
    According to another advantageous embodiment, said base station 100 is configured to transmit a first pilot signal through a first antenna element 110a of the antenna system 110 with a first spreading code, and to transmit a second pilot signal through a second antenna element 110b using a second spreading code, which is orthogonal to said first spreading code, wherein said first and second pilot signals are preferably transmitted simultaneously. Since orthogonal coding also allows the retrieval of phase information (shift) of pilot signals in a coded manner at terminal 200, which can also be employed as "orthogonal radio resources", in the sense of the present invention to provide terminal 200 , with the phase information needed to determine an ideal downtilt.
    According to another embodiment, the first pilot signal D1 (figure 3) can be identical to the second pilot signal D2. However, since both base station 100 and terminal 200 comprise information about the characteristic parameters of pilot signals D1, D2, pilot signals D1, D2 may also be different from each other.
    As can be seen from figure 3, it is also possible to employ more than two pilot signals D1, D2. More specifically, the time-frequency resource map in figure 3 shows the allocation of radio resources for the many n pilot signals D1 Dn, which - according to another embodiment - is alternately transmitted to terminal 200 (figure 2) , using different antenna elements 110a, 110b, 110c, ... 110n, each. That is, the first pilot signal D1 is transmitted through the first antenna elements 110a during a first time slot ts1, the second pilot signal D2 is transmitted through the second antenna element 110b during a second time slot ts2, and so on. onwards. Thus, after n time slots n, the first pilot signal D1 will again be transmitted by the first antenna element 110a. When using an OFDM system, clearly, it is also possible to employ only one subcarrier or a larger number of subcarriers to transmit the pilot signals.
    According to another preferred embodiment, the base station 100 is configured to periodically transmit pilot signals, in which a time interval between two subsequent transmissions of pilot signals from the same antenna elements 110a between about 1 millisecond and about 20000 milliseconds, preferably between 10 milliseconds and 1,000 milliseconds.
    As already explained above, when using time multiplexed transmission of different pilot signals, it is advisable to transmit the subsequent pilot signals D1, D2, .. via different antenna elements 110a, 110b, .. without substantial delays between them in order to minimize a phase error that can be introduced by a relative non-zero speed between the base station 100 and the terminal 200. However, as different subsequent transmission cycles of a plurality of pilot signals are concerned, it is sufficient to repeat such cycles within, for example, 10 milliseconds or even longer intervals, such as up to 1000 milliseconds or more. A cycle of pilot signals advantageously ensures that the terminal 200 allows to retrieve the phase information that can be used to determine a desired angle of inclination. However, due to the trigonometric relationship between the desired angle of inclination and a phase delay between the pilot signals received from different antenna elements, a period of time between subsequent pilot signal cycles may well be in the 1000 millisecond range. because, in the case of low relative speeds between the base station and the terminal, no substantial shift in relation to the optimal tilt angle is to be expected between subsequent pilot signal cycles.
    Thus, it is sufficient to carry out the steps of the method according to the embodiments over time, for example, within a cycle of 1000 milliseconds, to allow a sufficiently accurate determination of the ideal inclination angles. Advantageously, longer pilot signal cycle times allow for greater user data transmission capacity.
    It should be noted that the principle of the invention can also be applied in single time multiplexing systems. This system, for example, would provide numerous subsequent time bands ts1, ts2, .. which can be used for transmitting pilot downlink signals. To the extent that a simple time multiplexing system can comprise a radio resource scheme, which corresponds to a line of the OFDM system, as represented by figure 3, that is, there are several subsequent time intervals, but only in the (sub ) carrier for downlink transmissions. In a simple time multiplexing system, the inventive steps of transmitting specific pilot signals through different antenna elements 110a, 110b, .. would thus be performed one after the other, that is, one pilot signal per time interval . After receiving at least two pilot signals from two different antenna elements 110a, 110b of the antenna system 110, the terminal 200 can determine a respective phase shift and calculate a corresponding forward also the phase shift determined for the base station 100 on an uplink transmission, and base station 100 can calculate the optimal tilt angle itself. When applying the inventive principle to time multiplexing systems, it is important to transmit only one specific pilot signal per time slot to allow a terminal 200 to retrieve the associated phase information from the pilot signals.
    In contrast, in OFDM systems, where subcarriers of different frequencies can be employed as orthogonal radio resources, different pilot signals can be transmitted through subcarriers of different frequencies within the same time range, that is, simultaneously. Due to the OFDM principle, terminal 200 can, however, correctly retrieve phase information from all pilot signals involved.
    Alternatively or in addition, code multiplexing techniques can also be employed to transmit pilot signals to terminal 200.
    To ensure that terminal 200 is provided with the phase shift information signal that depends on the vertical distance Δx of at least two antenna elements 110a, 110b from antenna system 110, it is important that at least two pilot signals are transmitted via said different antenna elements 110a, 110b, respectively. Otherwise, that is, using only the transmissions, the optimum tilt angle could not be derived.
    According to another advantageous embodiment, terminal 200 (Figure 2) is configured to determine a phase shift between at least two pilot signals received D1, D2 and to transmit feedback information to said base station 100, wherein said base station 100 feedback information depends on or characterizes said phase shift between said pilot signals, as determined by said terminal 200. This advantage allows the base station 100 to apply a tilt angle θ for future data communications with terminal 200 that lead to optimal signal quality. Advantageously, the base station 100 can determine and / or implement the specific tilt angle values for individual terminals or groups of terminals 200 that are co-located within the radio cell served by the base station 100 based on phase shift measurements .
    According to another embodiment, terminal 200 is configured to transmit phase shifts between the determined pilot signals received to base station 100. Within this embodiment, the amount of signal processing related to the determination of the angle of inclination within the terminal 200 is minimized. However, based on information received from phase shift from terminal 200, base station 100 can evaluate the desired tilt angle for future communication with the respective terminal 200 based on the geometric properties of the antenna system (ie , the vertical distance of neighboring antenna elements) and elementary trigonometry.
    Alternatively or in addition, terminal 200 can be configured to determine a desired tilt angle for downlink / uplink I transmissions to base station 100, depending on the phase shift and to transmit the desired tilt angle value. In this case, therefore, terminal 200 will require including information about the parameters of the antenna system 110 used by the base station 100 (for example, the vertical distance of neighboring antenna elements).
    According to another embodiment, terminal 200 can also be configured to determine an index value that indicates one of a plurality of predefined tilt angle values that can be used by base station 100 that relates to the given phase shift and transmitting the index value of the base station 100. In contrast to the transmission of the determined phase shift values or a certain tilt angle, the index value requires only a reduced amount of transmission capacity in the uplink direction. However, compared to the mere phase shift transmission determined to the base station 100, a greater degree of signal processing at terminal 200 is required to determine said index value.
    According to another embodiment, terminal 200 is configured to receive pilot signals from at least one additional base station (not shown) of said cellular communications network, to determine a phase shift between said signals additional pilots, and to transmit feedback information about said second additional phase shift to said base station 100. In other words, the basic principle of embodiments is not only applied to pilot signals received by terminal 200 from its base station in service 100, but also e, pilot signals received from neighboring base stations (not shown). This advantage allows the terminal 200 to identify the inclination angles of transmissions from neighboring base stations that are undesirable as they lead to inter-cell interference (interference) effects, due to transmissions from the base station neighboring terminal 200. Then of receiving this return information, the base station 100 serving as terminal 200 can exchange scheduling information with its neighboring base station, that is, by notifying the neighboring base station not to use specific tilt angles that result in said interference interference -cell, as reported by terminal 200.
    The inventive principle advantageously allows the base station 100 to implement the optimal tilt angles on a per-terminal basis. That is, by applying the method according to the embodiments, the base station 100 can determine an optimal downtilt for each of the terminals 200 it serves. This ideal downtilt can be used for both downlink and uplink transmission due to the reciprocity of the radio channel.
    However, according to another embodiment, it may also be advantageous to use different angle values for uplink transmissions and downlink transmissions with a specific terminal 200. For example, if a terminal 200 currently served by a first base station 100 is roaming inside the radio cell provided by base station 100, terminal 200 may happen to depart from its base station in service 100, that is, going to a neighboring radio cell served by a base station additional, In this case, it may be advantageous to limit to a tilt angle θ to be implemented by the antenna system of the first base station 110 in order to reduce the inter-cell interference that can be introduced by directing the main lobe 111 (figure 1) from the beam pattern of the antenna system to the neighboring radio cell. Thus, even if the return information is provided by a terminal 200 positioned at the edge of the cell, it would be necessary to provide a first specific angle of inclination by the base station 100, it may be advantageous to limit the angle of inclination, which is currently implemented for such values that ensure that an amount of inter-cell interference is kept below a predetermined threshold value.
    However, for the case of uplink data transmission, the base station 100 can implement said first tilt angle, that is, the desired tilt angle as derived from the phase shift measurements of terminal 200, since due to the uplink transmission scenario, it is ensured that no inter-cellular interference is produced in relation to the neighboring cell, and on the other hand, the distance to the neighboring base station is comparatively large, so that the first base station 100 will not receive very interfering signals from the cell's border region.
    The principle of the invention can be applied to any antenna system 110 which comprises at least two vertically spaced antenna elements 110a, 110b, which can be individually controlled for RF transmissions. However, if there are more than two elements, a correspondingly larger number of pilot signals can be used, which also leads to an increase in the number of phase shift values to be evaluated at terminal 200.
    The invention can be applied, as well as if the base station 100 is equipped with more than a single column of dipoles 110a, 110b, .., 110m, that is, if an antenna arrangement for MIMO (Multiple Input Multiple Output) or horizontal beam formation is available. In this case, either the columns are used interchangeably for the pilot transmission, or only one specific column is used for this purpose, as explained above, with reference to the antenna system 110.
    According to another advantageous embodiment, downtilt information can be derived on a long-term basis or on a statistical basis. The pilot signals used for the estimation of vertical downtilt according to the embodiments should not be sent, for example, in each frame of an OFDM system, since the vertical antenna beam 111 is generated by the related antenna elements and the downtilt it is varying slowly, even in the case of mobility, that is, with a moving terminal 200. Thus, the necessary pilot overload can be kept moderate.
    Another advantageous embodiment proposes to direct the vertical beam of a set of fixed vertical beams. The base station 100, which can, for example, be configured as an eNB of an LTE system, transmits pilot tones D1; D2, Dn in dedicated time-frequency resources (see figure 3). It is assumed that a set of predefined vertical beamforming vectors is given (for example, through normalization), each comprising a predefined downtilt. For example, eight different downtilt values can be defined and can be driven by the use of a control data word having three bits.
    Terminal 200, which can be a user equipment device (UE) capable of LTE, receives the pilot signals transmitted by the eNB 100 and evaluates the phase shifts between these tones. From this, terminal 200 can better estimate the appropriate vertical beam-forming vector. Terminal 200 reports the index (three bits) of the vertical beam-forming vector, which is closest to the ideal vector, for eNB 100, as the feedback information, which may, for example, form a part of the signaling of uplink control. The closest (best adapted) vector is the one that exhibits the smallest phase shifts, when applied to the pilot tones received under the assumption that D1 (D2, .., D n are sent without any mutual phase shifts in the antenna system 110.
    After determining the best beamforming vector for each terminal 200 served, the eNB 100 applies the EU-vertical beamforming vectors specific for downlink transmissions to the respective terminals 200. In practice, this means that each terminal 200 can be served with a vertical antenna 111 that conforms to its current location within the cell. Signal data components from different antenna elements (ie, dipoles) will be added almost coherently to the respective receiver in the application of this specific vertical beam formation vector.
    In addition, eNB 100 can exploit the return vector indices for proper programming of terminals 200, in particular for coordinated Multi-point (COMP) techniques that aim to avoid mutual interference between the UEs in adjacent cells. In this case, the vector of cooperating indexes eNBs 100 must be exchanged and considered for programming decisions.
    According to another advantageous embodiment, which provides explicit feedback from the appropriate downtilt from terminal 200 to base station 100, if the capacity of certain reactions in the uplink is available, each terminal 200 can determine its appropriate downtilt and feed back this value directly instead of a vector index, as explained for the previous embodiment.
    The ideal downtilt can be calculated again from the measured phase shifts Δ <p of the received pilot tones, the known phase shifts from the pilot signals D1, D2, .., Dn in the antenna system 110, the known vertical distance Δx ( an attribute of the base station antenna hardware) and, if applicable, the constant mechanical downtilt applied to the base station antenna 110. The latter information can be merged with the mutual phase shifts between pilot signals D1, D2, .., Dn, and an explicit knowledge of this value at terminal 200 is not necessary. That is, the base station 100 adapts the phases of the pilot signals D1, D2 Dn such that the effect of a mechanical downtilt eventually applied to the antenna system 110 is completely compensated, at the receiving terminal 200. In the case where the eNB 100 works with a limited number of fixed beams (that is, several constant downtilt values can be used), the desired downtilt reported from terminal 200 is then mapped to the most suitable of the fixed beams available in eNB 100. For example, if two Fixed beams with 50 and 10 0 downtilts are defined in eNB 100, and terminal 200 reports a required 80 C downtilt, then the 10 ° beam will be applied to this 200 terminal by eNB 100.
    Generally, by applying the principle according to the embodiments, the eNB 100 is capable of serving the UEs 200 exactly with the reported downtilt and is not limited to a set of fixed downtilts.
    In addition, according to another embodiment, the explicit return of phase shifts between received pilot tones can be reported to the eNB 100. If the antenna hardware parameter Δx is not known at terminal 200, the following workaround can be applied: the terminal 200 measures and reports the phase shifts between various pilot signals received for the eNB 100. The eNB 100 applies corresponding reverse phase shifts to the RF signals to be transmitted from different antenna elements to compensate for the phase shifts as reported from terminal 200. Thus, the effect of non-coherent superposition, that is, without aligned phase, of signals coming from different dipoles (antenna elements) at terminal 200 (that is, a case of non-ideal downtilt ) is compensated without explicitly knowing the hardware parameters of the antenna and the downtilt actually applied in degree.
    Based on the present embodiments, the known techniques for coordination between neighboring base stations (e.g., eNBs) in order to avoid mutual interference can be advantageously enhanced.
    The above-mentioned embodiments advantageously allow a base station 100 to serve its terminals 200 with a suitable, that is, optimized, downtilt. This is achieved through the following consecutive steps: - transmitting pilot signals D1, D2 on the orthogonal radio resources associated with said specific pilot signals D1, D2, through different antenna elements 110a, 110b, cf. step 300 of the flowchart of figure 4, - at least one terminal 200 receives and evaluates pilot signals 11, D2, cf. step 310 of fig. 4, - information return is transmitted (step 320 of fig. 4) from terminal 200 to base station 100 which allows base station 100 to adapt the downtilt suitable for said at least one terminal 200.
    According to other embodiments, this basic scheme can be extended as follows:
    Terminal 200 receives and evaluates pilot tones from its eNB and service 100, as well as from neighboring eNBs (not shown). Return from terminal 200 to its base station in service 100 consisting of information related to the pilot tone measurements originating from in service eNB and / or neighboring eNBs. For example, this information may be the preferred vertical beam formation weights for transmissions dedicated to said terminal 200 of your eNB in service 100 and / or weights that cause maximal interference with terminal 200, when applied to the neighboring eNB. Through the exchange of information between eNBs, programming decisions and downtilt adaptations can be coordinated to avoid mutual interference. Alternatively, terminal 200 can measure and report the intensity of the interference signal on pilot tones from neighboring eNBs. In-service eNB 100 can take this knowledge into account for its programming decisions and exploit it for known interference coordination techniques.
    The formation of vertical dynamic beam activated by the present invention with the UE specific downtilt is an important means to reduce inter-cellular interference and, therefore, to increase spectrum efficiency. A prerequisite is knowledge of appropriate beamforming weights at base station 100. The invention in question presents a simple method of obtaining these weights with the help of a 200 terminal. The principle of the invention can be applied in a very general way wireless communication systems for Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems and additional systems such as CDMA systems.
    Generally, the embodiments can also be used in antenna systems that already comprise a non-zero (fixed) mechanical downtilt. In this case, the generally known mechanical downtilt, for example, which depends on the mounting conditions of the antenna hardware, is to be taken into account when evaluating a downtilt to be implemented by the base station.
    The description and drawings illustrate only the principles of the invention. Thus, it will be appreciated that those skilled in the art will be able to design different mechanisms that, although not explicitly described or presented here, incorporate the principles of the present invention and are included within its spirit and scope. In addition, all examples recited here are primarily intended expressly to be for educational purposes only to help the reader understand the principles of the invention and the concepts contributed by the inventor (s) to the advancement of the technique, and should be understood as being without limitation to the Examples specifically recited and condition. In addition, all instructions here reciting principles, aspects and embodiments of the invention, as well as specific examples thereof, are intended to cover their equivalents.
    The functions of the various elements shown in the figures, including any function blocks labeled "processors", can be provided through the use of dedicated hardware, as well as hardware capable of running software in association with the appropriate software. When provided by a processor, functions can be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which can be shared. In addition, the explicit use of the term "processor" or "controller" should not be interpreted in such a way as to refer exclusively to the hardware capable of running the software, and may implicitly include, without limitation, the hardware digital signal processor ( DSP), the network processor, the specific application of integrated circuits (ASIC), field programmable port arrangement (FPGA), read-only memory (ROM) for the storage software, random access memory (RAM) and storage non-volatile. Other conventional and / or custom hardware can also be included. Similarly, any switches shown in the figures are only conceptual. Its functions can be performed through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the specific technique being selectable by the implementer as more specifically understood from the context.
    权利要求:
    Claims (14)
    [0001]
    1. Base station (100) for a cellular communication network, wherein said base station (100) is configured to control at least one antenna system (110), which comprises a plurality of antenna elements (110a, 110b, 110c, ..., HOq), in which at least two antenna elements (110a, 110b) are arranged in different vertical positions (PA, PB) with reference to a virtual horizontal plane (P), characterized by the said base station (100) be configured to transmit specific pilot signals (D1, D2) over the orthogonal radio resources associated with said specific pilot signals (D1, D2) through others other than said at least two antenna elements (110a, 110b) , wherein said base station (100) is configured to receive the feedback information from a terminal (200), wherein said feedback information depends on or characterizes a phase shift between said pilot signals (D1, D2), as detected by ref terminal terminal (200), and to control a tilt angle (θ) for the transmission of downlink and / or uplink to / from said terminal (200) according to said return information.
    [0002]
    Base station (100) according to claim 1, characterized in that said base station (100) is configured to transmit a) a first pilot signal (D1) of a first radio resource through a first antenna element (110), and b) a second pilot signal (D2) of a second radio resource, which is orthogonal to said first radio resource, through a second antenna element (110b).
    [0003]
    Base station (100) according to any one of claims 1 to 2, characterized in that said base station (100) is configured to use at least one of the following radio resources as orthogonal resources: transmission time intervals, subcarriers , orthogonal codes.
    [0004]
    Base station (100) according to any one of claims 1 to 3, characterized in that said base station (100) is configured to transmit a first pilot signal (D1) by means of a first antenna element (110a), during a first downlink transmission time range (ts1), and to transmit a second pilot signal (D2) through a second antenna element (110b), for a second, preferably subsequent downlink transmission time interval ( ts2).
    [0005]
    Base station (100) according to any one of claims 1 to 4, characterized in that said base station (100) is configured to transmit a first pilot signal (D1) by means of a first antenna element (110a) in a first subcarrier (SC1) and transmitting a second pilot signal (D2) through a second antenna element (110b) on a second subcarrier (sc2), where said first and second pilot signals (D1, D2) are, preferably transmitted simultaneously.
    [0006]
    Base station (100) according to any one of claims 1 to 5, characterized in that said base station (100) is configured to transmit a first pilot signal (D1) by means of a first antenna element (110a) with a first spreading code, and for transmitting a second pilot signal (D2) through a second antenna element (110b) with a second propagation code, which is orthogonal to said first spreading code, wherein said first and second Pilot signals (D1, D2) are preferably transmitted simultaneously.
    [0007]
    Base station (100) according to any one of claims 2 to 6, characterized in that said first pilot signal (D1) is identical to the second pilot signal (D2).
    [0008]
    Base station (100) according to any one of claims 2 to 6, 10 characterized in that said base station (100) is configured to control the tilt angle (θ) for both downlink and uplink transmissions with said terminal (200), depending on this feedback information and use the different tilt angle values for uplink transmission and downlink transmissions.
    [0009]
    Base station (100) according to any one of claims 1 to 8, 15 characterized in that said base station (100) is configured to periodically transmit said pilot signals (D1, D2), in which a time interval between two subsequent transmissions of pilot signals (Dq, D2) of the same antenna element (110a) varies between about 1 milliseconds and about 20000 milliseconds, preferably between 10 milliseconds and 1000 milliseconds.
    [0010]
    10. Terminal (200) for a cellular communications network, characterized in that said terminal (200) is reconfigured to receive at least two pilot signals (D1, D2), which are transmitted from a base station (200) of said network cellular communications of orthogonal radio resources associated with said pilot signals (D1, D2), through different antenna elements (110a, 110b) that are arranged in different vertical positions (PA, PB) with reference to a horizontal virtual plane ( P), wherein said terminal (200) is further configured to determine a phase shift between said pilot signals (D1, D2) and to transmit feedback information to said base station (100), wherein said information return depends on or characterizes said phase shift between said pilot signals (D1, D2), as determined by said terminal (200).
    [0011]
    Terminal (200) according to claim 10, characterized in that said terminal (200) is configured for a. transmit phase shifts between the determined pilot signals received (D1, D2), to the base station (200), and / or b. determine a desired tilt angle (θ) for downlink transmissions at 35 from said base station (100) to said terminal (200), depending on the phase shift and transmit said desired tilt angle (O) to the station base (200), and / or c. determining an index value indicating one of a plurality of predefined tilt angle values that can be used by the base station (200) and which relates to the determined phase shift and transmitting said index value to the base station (100 ).
    [0012]
    Terminal (200) according to any one of claims 10 to 11, characterized in that said terminal (200) is configured to receive pilot signals from more than one additional base station of said cellular communications network, for determining a phase shift between said additional pilot signals, and to transmit feedback information depending on said additional phase shift to said base station (100).
    [0013]
    13. Method of operating a base station (100) for a cellular communications network, wherein said base station (100) is configured to control at least one antenna system (110), which comprises a plurality of antenna elements (110a, 110b, 110c, .., 110q), in which at least two antenna elements (110a, 110b) are arranged in different vertical positions (PA, PB) with reference to a horizontal virtual plane (P), characterized by said base station (100) transmitting specific pilot signals (Dl, D2), in orthogonal radio resources associated with said specific pilot signals (Dl, D2) through other than said at least two antenna elements (110a, 110b) , wherein said base station (100) receives feedback information from a terminal (200), wherein said feedback information depends on or characterizes a phase shift between said pilot signals (D1, D2), as detected by said terminal (200), and controls u m angle of inclination (θ) for the transmission of uplink and / or downlink to / from said terminal (200), depending on said return information.
    [0014]
    14. Method of operation of a terminal (200) for a cellular communications network, characterized in that said terminal (200) is configured to receive at least two pilot signals (D1, D2), which are transmitted from a base station (200) of said cellular communication network on orthogonal radio resources associated with said pilot signals (D1, D2), through different antenna elements (110a, 110b) that are arranged in different vertical positions (PA, PB) with reference to a horizontal virtual plane (P), wherein said terminal of (200) determines a phase shift between said pilot signals (D1, D2) and transmits the return information to said base station (100), wherein said feedback information depends on or characterizes said phase shift between said pilot signals (D1, D2) as determined by said terminal (200)
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    同族专利:
    公开号 | 公开日
    KR20130061178A|2013-06-10|
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    US20130295944A1|2013-11-07|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-28| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04W 16/28 Ipc: H04W 16/28 (2009.01), H04W 24/08 (2009.01) |
    2020-04-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-02-23| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 21/11/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11290043A|EP2482582B1|2011-01-26|2011-01-26|Base station, method of operating a base station, terminal and method of operating a terminal|
    EP11290043.6|2011-01-26|
    PCT/EP2011/070511|WO2012100856A1|2011-01-26|2011-11-21|Base station and method of operating a base station|
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