DE10329060B4 - Device and method for measuring the power of base stations in mobile radio receivers - Google Patents

Abstract

A device for measuring the power of a plurality of signals emitted by base stations in a mobile radio receiver, the mobile radio receiver comprising a payload detection receiving circuit (RF) which, in addition to detected payload symbols, also provides detected symbols of the signals to be subjected to power measurement, and wherein the device comprises:
a hardwired task-specific hardware unit (PMU) downstream of the receiving circuit (RF) for calculating a quantity characteristic of the power of a received signal on the basis of the detected symbols provided by the receiving circuit, the hardware unit (PMU) is designed to be operated in time division multiplex to measure the power of several of the received signals, such that the power measurements of the signals are each performed in several sub-steps and the hardware unit (PMU) buffer memory (TEMP_DCM_COMP1 / 2) for temporarily storing in the Partial steps calculated, respective intermediate results of performance measurements.

Description

The The invention relates to a device and a method for power measurement of several signals emitted by base stations, in a mobile radio receiver.

mobile radio standards the third and higher Generations see a surveillance a large number of mobile radio cells in the form of power and timing measurements in front. This is based on the fact that the mobile network this information to identify suitable base stations for construction and maintenance a radio transmission needed.

in the UMTS (Universal Mobile Telecommunications System) standard for the Performance measurement over transmit the CPICH (Common Pilot Channel) channel of each base station Signal used. As a rule, several base stations are at the transmission involved in user data to a mobile station. These "active" base stations form the so-called "Active Set. "The mobile station So in addition to the demodulation of those obtained from these base stations Payload also the respective CPICH reception services of the base stations of the Active Set. About that In addition, the CPICH reception services of base stations are also included not directly to the data transfer to the considered Mobile station are involved. These base stations (respectively their associated Cells) are called "monitor Set ".

According to the UMTS standard should be performance metrics for up to 32 cells in the "own" frequency band (Intra Frequency) and for up to 32 cells in other UMTS frequency bands (Inter Frequency) are collected. The to be monitored Cells are communicated to the mobile station by the UMTS network.

The Results of performance measurements must be submitted to the UMTS network will be reported. This requires that the power measurements of the CPICH channels of the cells in question repeated at regular intervals Need to become. In their own frequency band (Intra Frequency), the power measurements to cells of the Active Set and the Monitor Set in normal operation during the Demodulation of the payload data are performed. By the others Frequencies, i. in the inter-frequency range, the so-called "compressed-mode gap" is available, in an adaptation to the frequencies of neighboring cells and a subsequent Performance measurement executed can be.

conventional approaches based on, for the base stations of the Active Set several parallel independent power measuring devices (for every Base station one) and for the base stations of the monitor Set also several parallel measuring devices in the receiver too to implement. The number of required power measuring devices depends on it from the standard refresh rate of power measurements required for the individual cells and the circuit design of the measuring equipment from.

In Scripture US 6,275,483 B1 the detection of radio channels in CDMA signals is described. The described procedure involves measuring the signal-to-noise ratio of a given radio channel and repeating the measurement for different radio channels.

Also the document US 2003/39222 A1 describes a method for power measurement in mobile radio receivers, in which several channels are sequentially measured in a power measurement unit become.

In The document WO 00/03501 A1 discloses a method for minimizing Frame losses during an inter-frequency search of a mobile station in a CDMA system described in wel chem, the mobile station, the base station on the planned inter-frequency search informed in advance.

The font US 6,243,410 B1 describes the time-variable forwarding of output data of a Rake correlator to different receiving units, including a power measuring unit.

The invention has for its object to provide a device for measuring the power of multiple signals in a mobile radio receiver, the standard requirements with respect to the number and frequency of power measurements he with low implementation costs crowded. Furthermore, the invention aims to provide a method for measuring the power of a plurality of signals in a mobile radio receiver having the above-mentioned characteristics.

The The invention is based task by the Characteristics of the independent claims solved. advantageous Embodiments and developments of the invention are the subject of Dependent claims.

According to claim 1, a first essential aspect of the invention is For power measurement, a hard-wired, task-specific hardware unit provided connected to the output of a receiving circuit is, which is used for Nutzdatendetektion in the receiver. The detected Symbols of the signals to be subjected to a power measurement So not in a separate unit but formed by the anyway in the mobile receiver existing receiver circuit provided for Nutzdatendetektion. A second essential aspect of the invention is that the hardwired, dedicated (dedicated) hardware unit operated to calculate the power measured in time division becomes. A single (physically existing) hardware unit can be sufficient to all UMTS standard required power measurement data with sufficient repetition frequency to generate. The power measurements of the different signals are executed in each case in several sub-steps and the hardware unit has latches for temporary storage of calculated in the substeps, respective intermediate results the power measurements on.

insofar has the hardware unit according to the invention according to a first advantageous embodiment of the invention only a single signal path, which the power measurement of all performs a power measurement to be subjected received signals. The Power meter is characterized with a minimum of hardware effort or chip area implementable.

Preferably the receiving circuit is a rake receiver, the at least one time-multiplexed physical rake fingers for demodulation having a plurality of signals. For example, a rake finger used to demodulate the CPICH channel of a base station become a channel estimate in terms of a certain propagation path between the base station and the mobile receiver perform (As is well known, those transmitted over the CPICH channel Pilot symbols in UMTS receivers regularly to Purposes of a channel estimation used and for this in a suitably programmed rake finger by correlation with in the receiver evaluated known CPICH symbols. In the task-specific Hardware unit, the power measurement is now also based on the detected pilot symbols of the CPICH channel. The Power meter according to the invention thus uses the result of a demodulation in the Rake receiver, the in itself for completely different purposes (channel estimation) was set up. As a result of the time-division multiplexing of the task-specific according to the invention Hardware unit, this is in a simple way to the time-multiplexed Processing of the at least one physical rake finger customizable.

Preferably The hardware unit has a first hardware circuit for determining a coherent contribution to the power measure to be calculated and a second hardware circuit for detection an incoherent one Contribution to the power measure to be calculated. By providing leaves these two circuits reach a variable in terms of the algorithm calculation of the power measurement.

According to one particularly advantageous implementation, the inventive device a digital signal processor for programming the hardware unit with measuring parameters for signal-specific parameterization of calculating performance measure. By doing so leaves to achieve that the digital signal processor the process for Calculation of the power quantity both in algorithmic terms as well as in terms of timing controls or controls.

For this purpose, the measurement parameters advantageously comprise one or more of the following parameters: an identification number of a signal specific power measurement task, an indication of the number of symbols coherent (ie taking into account amplitude and phase) in the hardware unit during one Power measurement task, an indication of the number of coherent addition results to be incoherently added (ie taking into account the magnitude of the results) during a power measurement task in the hardware unit, an indication of the transmit mode the respective base station and information about the start and end time for a computing activity of the hardware circuit. The digital signal processor can thus determine the time interval in which the power measurement is performed, as well as the time range for the coherent and the inko significant addition or integration of the detected symbols.

at the method according to the invention for power measurement of multiple signals from base stations be radiated in a mobile receiver, in a first Step in a receiving circuit provided for Nutzdatendetektion Symbols of the signals to be subjected to a power measurement detected. In a second step, a size is received for the performance of a Signal is characteristic, on the basis of that of the receiving circuit provided detected symbols in a hard-wired, task-specific hardware unit. Here is the Hardware unit for measuring the performance of several received Signals in time division multiplex operated so that the power measurements the signals are each executed in several sub-steps and intermediate results of the power measurements calculated in the substeps in each case in temporary storage (TEMP_DCM_COMP1 / 2) of the hardware unit (PMU) temporarily get saved.

According to one advantageous variant of the method is the hardware unit for power measurement of signals from cells that carry a payload connection exists, i. the cells of the Active Set, and to measure power of signals from cells being monitored are without a Nutzdatenaustausch connection exists, i. the cells of the monitor set, used. Separate hardware units to carry out this power measurement tasks at different base stations are not required.

A further advantageous embodiment the method according to the invention This is characterized by the fact that the hardware unit for identification the scrambling code of a cell (or base station) is used. As known in the art, each base station transmits a special "identification code" that acts as a scrambling code (Scrambling code) is referred to and the mobile subscriber unambiguous recognition or identification of this base station allows. Since the recognition / identification of a scrambling code algorithmic Seen a performance measurement is based, the hardware unit according to the invention additionally to perform this task also to the performance measurements.

Favorable Way, the quantities calculated in the hardware unit become one Result value memory stored, and the result value memory is at regular intervals, in particular in the frame time clock, read by the digital signal processor. Of the Thus, on the one hand, digital signal processors are available through programming the hardware unit the different measuring tasks, that of the hardware unit in time division according to the given Parameters executed become. For example, it may be provided that in a frame time clock for four various to be monitored Cells each a measuring task is executed and the corresponding Result values are stored in the result memory. When Receiving device would a single time-multiplexed virtual rake-finger used become. This approach could then in addition extended to all time-multiplexed virtual rake fingers. However, the reading of the result value memory is temporally seen independently from the task-related programming of the hardware unit (i.e. independently from the individual durations of the executed tasks). You can, for example orient the reading of the result value memory at the frame time period. In the signal processor, the individual result values are buffered until these according to the update time interval, that on the part of the standard or the mobile network for the feedback updated performance metrics are given to mobile subscribers, be reported to the base station.

The Invention will now be described with reference to an embodiment with reference closer to the drawings explains; in these shows:

1 a block diagram of a rake receiver with a rake finger consisting of two code components, an antenna decoupling unit, a digital signal processor (DSP) and a power measuring unit;

2 a detailed block diagram representation of the antenna decoupling unit and the power measuring unit;

3 a representation for explaining the time division multiplex operation of the Rake receiver; and

4 a memory partitioning for a result value memory.

1 schematically shows the structure of a rake receiver with downstream power measurement unit in a mobile station. Only the signal processing in the baseband range is considered.

The rake receiver in the example considered here consists of a single rake finger RF with two parallel code demodulators. It is therefore referred to as DC (Dual Code) rake finger RF. The structure of the DC rake finger is known. The DC rake finger RF has on the input side a register REG, to which an interpolator TVI (TVI: Time Variant Interpolator) is connected downstream. The output signal of the interpolator TVI is supplied to two parallel arranged correlators (multipliers) DE_SCR, which perform a deinterleaving with the base station individual scrambling code. The two correlators DE_SCR are followed by two further parallel correlators (multipliers) DE_CHAN. The correlators DE_CHAN perform despreading with the channel-individual channelization code. In the signal path behind each correlator DE_CHAN there is an integrator INT, which performs an integration of the chips despread in the correlators DE_SCR and DE_CHAN over a symbol duration. For this purpose, the integrators INT are controlled with the respective spreading factors sf1 and sf2 of the channels to be demodulated. The spreading factors sf1 and sf2 respectively indicate the (channel-specific) number of chips within a symbol and are determined by the channelization code used. The symbols formed in the integrators INT are buffered in respective output memories STO. A multiplexer PAR2SER selects one of the two outputs 1 . 2 of the DC rake finger RF and outputs the symbols obtained from this output via a data connection 3 out.

The functionality of a Rake receiver is known and will be briefly discussed below:
In mobile radio signals are subject to multipath propagation, which has the consequence that at the receiver more received signal versions of a transmitted signal occur, which are temporally shifted from each other and attenuated differently. The functional principle of a Rake receiver is based on the fact that the receive signal versions are evaluated separately and overlaid in the correct time. For this purpose, the delay times ("delays") of the different signal versions in the receiver must be estimated and taken into account in the demodulation of the signal versions in the rake finger. The delay time of the propagation path of the high-frequency part (not shown) received signal received from an antenna bandwidth limited by an input filter, mixed down from a mixer to baseband and by an analog-to-digital converter (not illustrated sets) with a sufficiently high sampling frequency ( at least twice the chip rate) is sampled and in the DC rake finger RF is to be demodulated, is compensated for this purpose before feeding into the DC rake finger RF. In practice, this finger-specific delay compensation is accomplished by reading the samples output from the analog-to-digital converter into memory (not shown) and reading them out for each rake finger with the finger-specific time delay. At the in 1 illustrated samples x _k (k denotes the discrete time), which are fed to the input register REG of the DC rake finger RF, it is already about the finger-individually time delayed read samples. The DC rake finger RF is thus already set in terms of time to the propagation path to be demodulated.

In the (optional) interpolator TVI is an interpolation of the samples to readjust the optimum sampling time made. at this interpolation is made e.g. two samples, with double Chip rate in the analog-to-digital converter were generated, one sample per chip at the optimum sampling time calculated. This will result in a fine timing of the DC rake finger RF achieved in the time domain less than the chip time.

In the correlators DE_SCR and DE_CHAN become despreading or deinterleaving with the used spreading code (which results from the channelization code and the scrambling code). Because both code components of the DC rake finger RF signals demodulate over the the same propagation path are those in the correlators DE_SCR used base station-specific scrambling codes identically. The channel separation takes place in the correlators DE_CHAN. For example For example, the one correlator DE_CHAN can control the UMTS channel P-CCPCH (Primary Common Control Physical Channel) while the other correlator DE_CHAN demodulated the UMTS channel CPICH (Common Pilot Channel). The im UMTS standard provided physical channels are in the specification 3GPP TS 25.211 V4.2.0 (2001-09). Every physical channel is defined by a specific channelization code.

After the already described symbol formation in the integrators INT, the respective symbols are formed according to the respective symbol time duration (predetermined by the spreading factors sf1 and sf2) and stand at the exits 1 . 2 DC rake finger RF ready.

As in the following even closer described, becomes the DC rake finger RF in time division for uses the demodulation of different propagation paths. This means, that physically alone this one DC rake finger RF exists which is by means of time division multiplexing for the demodulation of all Transmitted propagation paths Signals is used. By time-multiplexing the DC rake finger RF will be the other needed Rake fingers generated in the form of "virtual" rake finger.

by virtue of of time division multiplexing of the DC rake finger RF must be in the integrators INT obtained intermediate results for each virtual DC rake finger RF cached and in the next multiplex cycle for the same virtual DC rake finger RF available again be. This task is handled by the memory TEMP_DCINTR (Temporary DC rake integration buffer) perceived.

At the Output of the DC rake finger RF is an antenna decoupling unit A_DEC connected. The antenna decoupling unit A_DEC becomes only in the case of a transmitter-side antenna diversity (in UMTS: the use from two transmit antennas), to separate the antenna-specific signal components. this will later even closer explained.

The antenna decoupling unit A_DEC is a module for power measurement 4 downstream.

The module 4 includes as a central part of a power measurement unit PMU, which is designed as a dedicated hardware circuit. The power measurement unit PMU contains two serial hardware data paths MEAS_DC_COH and MEAS_DC_INCOH. The output of the rear data path MEAS_DC_INCOH in the signal path is connected to a result value memory SY_BUF. Furthermore, the first data path MEAS_DC_COH is in data communication connection with two temporary intermediate value memories TEMP_DCM_COMP1 and TEMP_DCM_COMP2, while the second data path MEAS_DC_INCOH is connected to a temporary intermediate value memory TEMP_MEAS_RAM.

The module 4 Also includes two parameter memories, PAR_MEAS_DC_CHANGE and PAR_MEAS_DC, a gate switch GATE, a gate switching circuit SCHED GATE, a control pipeline CONTROL_PIPE and a state generator FSM (Finite State Machine).

The module 4 is via a data bus 5 with a digital signal processor DSP in data exchange connection. Furthermore, a control of the module takes place 4 via an external control pipeline DC_RAKE_CONTROL_PIPE, which controls the multiplexing of the DC rake finger RF.

r:

Nummer des virtuellen DC-Rake-Fingers RF. Z.B. können 32 virtuelle (zeitgemultiplexte) DC-Rake-Finger RF mit r = 1, ..., 32 vorgesehen sein;

task_no(r):

Nummer des aktuellen Task des DC-Rake-Fingers RF der Nummer r;

mode(task_no(r),r):

senderseitiger Übertragungsmodus des Signals, das der DC-Rake-Finger RF der Nummer r während der Abarbeitung der Task der Nummer task_no(r) demoduliert; in UMTS gibt es den sogenannten "Normal Mode" ohne senderseitige Antennendiversität und den T×Div-Mode (Transmit Diversity Mode) mit senderseitiger Antennendiversität. Der Übertragungsmodus kann für jeden DC-Rake-Finger r und für jede Task-Nummer task_no(r) unterschiedlich sein. Beispielsweise kann der DC-Rake-Finger RF der Nummer r mit zwei Tasks betrieben werden: im Task 1 soll eine Leistungsmessung innerhalb einer Zelle × im Normal Mode durchgeführt werden, im Task 2 soll eine Leistungsmessung innerhalb der Zelle y im T×Div-Mode durchgeführt werden;

t_coh(task_no(r),r):

gibt an, wieviel CPICH-Symbole kohärent, d.h. komplexwertig unter Berücksichtigung von Amplitude und Phase, in dem Datenpfad MEAS_DC_COH addiert werden sollen. In der Regel sollen zwei, vier oder acht CPICH-Symbole integriert werden;

t_incoh(task_no(r),r):

gibt an, wieviel Resultate der kohärenten Integration inkohärent (d.h. als Summe von Betragsquadraten der kohärenten Resultate) in dem Datenpfad MEAS_DC_INCOH aufintegriert werden sollen. In der Regel gilt t_coh·t_incoh ≤ 32 CPICH-Symbole. Da ein Zeitschlitz im UMTS-Standard 10 CPICH-Symbole jeweils einer Zeitdauer von 256 Chips enthält, wird in etwa über die Länge von drei Zeitschlitzen, d.h. über 3 × 566 μs, integriert.

The DSP is over a data bus 5 with the parameter memory PAR_MEAS_DC_CHANGE and the circuit SCHED in connection. In the memory PAR_MEAS_DC_CHANGE are on the part of the DSP for programming the module 4 the following parameters are stored:

r:

Number of the virtual DC rake finger RF. For example, 32 virtual (time division multiplexed) DC rake fingers RF with r = 1, ..., 32 may be provided;

task_no (r):

Number of the current task of the DC rake finger RF of the number r;

mode (task_no (r), r):

transmitter-side transmission mode of the signal which the DC rake finger RF of the number r demodulates during the execution of the task task_no (r) task; In UMTS there is the so-called "Normal Mode" without transmitter-side antenna diversity and the T × Div mode (Transmit Diversity Mode) with transmitter-side antenna diversity. The transmission mode can be different for each DC rake finger r and for each task number task_no (r). For example, the DC rake finger RF of the number r can be operated with two tasks: in task 1 a power measurement is to be performed within one cell × in normal mode, in task 2 a power measurement is to be performed within cell y in T × div mode be performed;

t_coh (task_no (r), r):

Indicates how many CPICH symbols should be added coherently, ie complex-valued taking into account amplitude and phase, in the data path MEAS_DC_COH. As a rule, two, four or eight CPICH symbols should be integrated;

t_incoh (task_no (r), r):

indicates how many results of the coherent integration should be integrated incoherently (ie as the sum of absolute squares of the coherent results) in the data path MEAS_DC_INCOH. As a rule, t_coh · t_incoh ≤ 32 CPICH symbols. As a time slot in the UMTS standard 10 CPICH symbols each having a duration of 256 chips is integrated over approximately the length of three time slots, ie over 3 × 566 μs.

At the time of reprogramming the module 4 the parameters applied in the parameter memory PAR_MEAS_DC_CHANGE are written into the parameter memory PAR_MEAS_DC under the control of the circuit SCHED and the gate switch GATE.

From this point on, the processing will be in the module 4 determined by these parameters, since all circuits in the module 4 only have access to the parameter memory PAR_MEAS_DC. The advantage of using two parameter stores PAR_MEAS_DC_CHANGE and PAR_MEAS_DC is that already during the processing of data in the module 4 a new parameter set for a subsequent, differentiated processing of data from the DSP in the module 4 can be stored. When loading the parameter memory PAR_MEAS_DC with the current parameter set, the previously used parameter set is overwritten.

The control pipeline CONTROL_PIPE accesses via a data connection 6 to the parameter memory PAR_MEAS_DC and reads the following parameters depending on the addressing parameters r, task_no (r): r, task_no (r), mode (task_no (r), r), t_coh (task_no (r), r), t_incoh (task_no (r), r). The addressing parameters r, task_no (r) are output by the external control pipeline DC_RAKE_CONTROL_PIPE for the DC rake finger RF.

symbol_count:

gibt eine laufende Nummer des aktuell am Ausgang 3 des DC-Rake-Fingers RF bereitstehenden Symbols im Zeitrahmen (Frame) der aktuell detektierten Basisstation an;

task_init(r):

gibt an, zu welchem Zeitpunkt in dem DC-Rake-Finger RF der Nummer r eine bestimmte Demodulationsaufgabe beginnt. Zu diesem Zeitpunkt stehen gemäß dieser Demodulationsaufgabe demodulierte Symbole am Ausgang 3 des DC-Rake-Fingers RF zur Verfügung.

The parameters of the control pipeline CONTROL_PIPE in the module 4 are supplemented by two further parameters, which are also issued by the external control pipeline DC_RAKE_CONTROL_PIPE for the DC rake finger RF, namely:

SYMBOL_COUNT:

gives a serial number of the currently on the output 3 the DC rake finger RF available symbol in the time frame (frame) of the currently detected base station;

task_init (r):

indicates at which time in the DC rake finger RF of number r a certain demodulation task begins. At this time, according to this demodulation task, demodulated symbols are present at the output 3 of DC rake finger RF available.

The provided by the external control pipeline DC_RAKE_CONTROL_PIPE Parameters also come from the DSP. They were for programming of the DC rake finger RF output from the DSP and are not in here stored stored further parameter memories.

The control pipeline CONTROL_PIPE has a data connection 7 connected to the state generator FSM. About the data connection 7 the parameters r, task_no (r), mode (task_no (r), r), t_coh (task_no (r), r), t_incoh (task_no (r), r), task_init (r) and symbol_count are transmitted, see also 2 ,

to Simplification of the spelling will be given below in brackets omitted arguments of the parameters omitted.

2 shows the structure of the antenna decoupling unit A_DEC. The antenna decoupling unit A_DEC comprises a multiplier MULT, an inverter INV, a buffer memory BF, a first multiplexer MUX1, a second multiplexer MUX2, a complex adder CADD and an antenna pattern memory ANT2-PATTERN.

In the case of the T × Div mode, the antenna 1 of the base station under consideration transmits the CPICH symbols symb ^ant1 _k modulated with the sequence A, A, A, A, A, A .... The symbols symb ^ant2 _k emitted by the transmitting antenna 2 are labeled with the sequence A, -A, -A, A, A, -A, -A, A, -A, -A, A, ... (starting with the frame start of the currently received base station). Here A = 1 + j, where j is the imaginary unit.

The received symbol r (k) in the T × DiV mode results from a superposition of the components of the antenna 1 and the antenna 2: r (k) = h1 · symb ant1 k + h2 · symb ant2 k ,

there h1 and h2 respectively denote the channel coefficients of a propagation path from antenna 1 or from antenna 2 to the mobile radio receiver. Of the going back to antenna 1 Contribution for r (k) is received by adding two consecutive ones Symbols get: r (k) + r (k + 1) = 2 · h1 · A. The on the antenna 2 declining Contribution for r (k) is a subtraction of two consecutive Symbols get: r (k) - r (k + 1) = 2 · h2 · A. The Modulation pattern +, -, -, + for the antenna 2 is stored in the antenna pattern memory ANT2-PATTERN and controls the inverter INV. Prerequisite for the specified formulas is correct referencing of the CPICH symbols used with respect to the frame start of the respective base station. To this end the parameter symbol_count serves.

In normal mode (without transmitter-side antenna diversity) each incoming symbol r (k) is multiplied by A ^* (* denotes the complex conjugation) in the multiplier MULT and over the data line 10 the multiplexer MUX1 and via the data line 11 and the buffer memory BF supplied to the multiplexer MUX2. The multiplexers MUX1, MUX2 forward two received symbol values (for the time units k, k + 1) to the complex adder CADD, where they are coherently added. The addition result is via the data connection 12 issued as complex-valued size.

In T × Div mode, after multiplying the symbol by the value A ^*, the symbol is multiplied by the modulation pattern +, -, -, + of the antenna 2. The inverted or non-inverted symbols are temporarily stored on the one hand in the buffer memory BF and then output to the multiplexer MUX2 and on the other hand directly via the data connection 13 forwarded to the multiplexer MUX1. The multiplexers MUX1, MUX2 are connected in such a way that they are connected via the data connection 13 and the inverted or non-inverted symbols (MUX2) obtained from the buffer memory BF, respectively, to the complex adder CADD. The output of the decoupled complex-valued symbols again takes place via the data connection 12 (the data connection 12 is shown here separately for the real part and the imaginary part of these symbols). The buffer BF is required to provide pairs of symbols at times k, k + 1, respectively.

symb_vld:

gibt an, wann ein CPICH-Symbol vollständig integriert wurde und fertig zur Weiterverarbeitung ist; diese Angabe wird benötigt, da in dem Multiplizierer MULT keine Zwischenergebnisse von dem Integrierer INT, sondern allein die fertig integrierten Symbole multipliziert werden sollen;

main_counter:

gibt den Systemtakt (oder gegebenenfalls den Chiptakt oder den 4-fach Chiptakt) an. Wie noch näher erläutert, wird beispielsweise mit einem Systemtakt von 124.8 MHz gearbeitet.

The antenna decoupling unit A_DEC is controlled via the parameters r, main_counter, symbol_count and symb_vld. According to 1 these parameters are provided by the control pipeline DC_RAKE_CONTROL_PIPE:

symb_vld:

indicates when a CPICH symbol has been fully integrated and ready for further processing; this information is required because in the multiplier MULT no intermediate results from the integrator INT but only the fully integrated symbols are to be multiplied;

main_counter:

indicates the system clock (or if applicable, the chip clock or the 4-fold chip clock). As will be explained in more detail, for example, a system clock of 124.8 MHz is used.

Of the Parameter symbol_count is needed to the antenna modulation sequence A, -A, -A, A and their cyclic permutations A, -A, A, -A and -A, A, A, -A respectively to allocate the time frame situation.

In the following, the power measuring unit PMU is calculated on the basis of 2 explained in more detail.

The power measurement unit PMU leads, as already mentioned, a coherent and an incoherent integration over the data connection 12 obtained (in T × Div mode with respect to the transmitting antennas decoupled) by symbols. The data paths MEAS_DC_COH and MEAS_DC_INCOH calculate a performance variable P according to the following formula:

First, a coherent summation takes place via t_coh symbols in accumulators ACCU_R and ACCU_I, separated according to real and imaginary part. Since the power measurement unit PMU is operated in time division multiplex mode - this makes it possible to process the symbols supplied by the time multiplexed DC rake finger RF without demultiplexing - the intermediate results of the accumulation must be stored in memories and retrieved at the time given by the multiplexing operation to continue the accumulation calculation. The two memories TEMP_DCM-COMP1 / 2 are used for this purpose. Since two CPICH channels can be demodulated simultaneously with the DC rake finger RF, the memory TEMP_DCM_COMP1 is used for the clipboard of accumulation results obtained from the first component (output 1 ) of the DC rake finger RF, while the memory TEMP_DCM_COMP2 is used to clip intermediate results obtained from the second component (output 2 ) of the DC rake finger RF.

in the It is assumed below by way of example that the physical DC rake finger RF is operated with 32-times time division multiplex. The Both memory TEMP_DCM_COMP1 / 2 then each require a memory area of at least 32 (number of virtual DC rake fingers) x 2 (number the transmit antennas) · 2 (Intermediate results are complex) · 12 (word length of an intermediate result) Bit = 1536 bits.

As soon as all required symbols are coherently accumulated, which is indicated by the signal t_coh_expired, the accumulation results are converted to the inputs by switching the multiplexer MEAS_MUX1 20 . 21 to a squaring and adding unit SQR & ADD. The squaring and adding unit SQR & ADD performs the squaring of the intermediate results by squaring the intermediate result of the real part and the intermediate result of the imaginary part, and adding the square values obtained thereby.

erhalten wird. Wie später noch gezeigt wird, ist es auch möglich, die Leistungsmessgrößen für die beiden Antennen getrennt auszugeben. Ein ausgangsseitig vorgesehener Stellenverschieber SHIFT führt eine Normierung des Ergebnisses in Abhängigkeit von der Anzahl der integrierten Symbole durch.In an accumulator ACCU_ANT1 / 2 connected downstream of the squaring and adding unit SQR & ADD, the absolute squares of the coherently obtained integration results for the two antenna contributions are added, whereby for each component of each virtual DC rake finger RF a value of the form

is obtained. As will be shown later, it is also possible to output the power measurements for the two antennas separately. An output side shift shifter SHIFT performs a normalization of the result as a function of the number of integrated symbols.

Of the remaining calculation step - the incoherent accumulation of absolute sums of squares - is in the data path MEAS_DC_INCOH.

The Accumulation takes place by means of the accumulator ACCU, due to of the time division multiplexing the accumulator, a multiplexer MEAS_MUX2 upstream and a multiplexer MUX4OUT is connected downstream, which each with the temporary Intermediate value memory TEMP_MEAS_RAM are in data connection. Of the Intermediate value memory TEMP_MEAS_RAM is sent via the multiplexer MUX4OUT fed with accumulation intermediate results. Is needed a memory area of at least 32 (number of virtual DC rake fingers) x 2 (number the components of the DC rake finger RF) · 20 (word width of the input value) Bit = 1280 bits. After a number of t_incoh incoherent accumulation steps the accumulation result is passed through in a SCALE / SHIFT stage Scales a job offset and to the result value memory SY_BUF output.

For a better understanding of the time-division multiplex operation of the power measurement unit PMU, the time division multiplex operation of the DC rake finger RF is first of all based on 3 explained.

In the upper part of the 3 Time-divisional cycles are shown. A time division multiplex cycle comprises four chips. At a system clock frequency of 128.8 MHz, processing for the duration of the four chips in each component is available for all time division multiplexed versions of the DC rake finger RF 130 system clocks (main_counter).

Within a time division multiplex cycle (130 system clocks), 32 virtual DC rake fingers RF are to be operated. Thus, in each multiplex cycle (4 chips), each DC rake finger RF is assigned 4 system clocks. This is in the lower part of the 3 clarified. At time t1, the 4 system clocks assigned to the virtual DC rake finger r = 1 have expired, at time t2 the system clocks assigned to the virtual DC rake finger r = 2 have expired,..., And at time t32 are the virtual DC rake finger r = 32 expired 4 system clocks expired.

The physical DC rake finger RF consists of two components. Therefore, each component of each time division multiplexed (virtual) DC rake finger RF is assigned exactly two system clocks in which the power measurement calculation procedure is pipelined. This is in the 3 by the information "code component 1" and (2 system clocks later) "code component 2" indicated.

Since within 4 chips each component of the 32 virtual DC rake fingers RF is "served", the processing of the incoming CPICH symbols of all virtual DC rake fingers RF is completed within 4 chips. However, since CPICH symbols are only available in the 256-chip raster (the spreading factor sf of the CPICH channel is 256), symbol formation within a time division multiplex cycle is not possible. However, since the monitor set cells to be monitored have no time correlation with each other, in the next 4-chip interval of other virtual DC rake fingers, CPICH symbols of another monitored monitor cell could be demodulated and the power measurement module 4 to provide. The cell monitored during the first time division multiplex cycle is in

3 denoted by x, the cell monitored in the subsequent time division multiplex cycle is indicated by y. The virtual DC rake fingers RF used for the demodulation of the CPICH channel of cell y are designated by rake fingers a, rake fingers b,.... Another possibility is to synchronize all input data of the various monitor cells on the 256-chip grid of the reference timing before feeding the rake finger. Thus, the power measurement unit PMU is activated only within the first 4 chips of the 256-chip grid of the reference timing.

Based 3 As can be seen, the temporal sequence of the work activity of the individual virtual DC rake fingers r = 1,..., 32 follows a fixed time schedule as a result of the multiplex operation. This temporal scheme (each virtual DC rake finger r = 1, ..., 32 are assigned exactly 4 system clocks) is based on the time division multiplex operation of the power measurement unit PMU. This means that the two data paths MEAS_DC_COH and MEAS_DC_INCOH work every 4 system time clocks for another virtual DC rake finger r = 1,..., 32.

Another aspect is the task-related programming of in 1 shown circuit. In the exemplary embodiment illustrated here, it is provided that within a time frame (a time frame comprises in the UMTS standard 15 Time slots each with 2560 chips) each virtual DC rake finger can perform 4 tasks. The time length of a task is variable, ie a task can take a few symbols up to several timeslots. Only power measurement tasks and scrambling code detection tasks are considered below. These must be both the DC rake fingers RF and the power measurement module 4 since the DC rake fingers RF must use the "correct" spreading code to despread the CPICH channel of a particular cell x (base station) for processing the task and the module 4 for power measurement, it must also know when it has to evaluate the symbols supplied by the time multiplexed DC rake fingers for what period of time. For example, in each of the 4 tasks of a time frame, a DC rake finger RF may perform a performance measurement within a plurality of monitored cells x, y, z, ... of the monitor set.

The Task-related control of the power measuring unit PMU takes place in dependence from the parameters r, task_no, mode, t_coh, t_incoh, task_init under Control of the state generator FSM.

How out 2 can be seen, the state generator FSM in addition to the aforementioned parameters, which via the data connection 7 are received, the system clock main_counter and a signal dec_symb_vld forwarded. The signal dec_symb_vld obtained by the antenna decoupling unit A_DEC indicates when two contributions of the two antennas are present separately (ie decoupled) for further processing.

t_coh_expired:

gibt an, wann die Zeit für die kohärente Integration abgelaufen ist;

t_incoh_expired:

gibt an, wann die Zeit für die inkohärente Integration abgelaufen ist.

Upon the occurrence of the flag task_init, internal registers of the state generator FSM are reset and the internal counters COUNTERS are initialized to generate the signals t_coh_expired, t_incoh_expired. These mean:

t_coh_expired:

indicates when the time for coherent integration has expired;

t_incoh_expired:

Indicates when the time for incoherent integration has expired.

As soon as a performance measurement task or a scrambling code detection task in the sequence of tasks the state generator FSM generates the enable signal ena. With this signal ena, the state generator FSM and the Power measuring unit PMU activated. The signal ena is dependent on the unit "MEASUREMENT ENABLE" generated by the parameters r, task_no, task_init.

Further the state generator FSM calculates the end times t_coh_expired by means of the counters COUNTERS or t_incoh_expired for the end times of the two integration processes in MEAS_DC_COH or MEAS_DC_INCOH.

The said control parameters are the power measurement unit PMU via control data connections 14 fed.

From the above explanations, it is clear that the power measuring unit PMU is "transparent" to the system-specific task due to the control via the state generator FSM. The power measuring unit PMU always carries out only one integration task. The tasks to be processed (eg four pieces per time frame) as well as the reprogramming of the module 4 are predetermined solely by the DSP with the aid of the cell and task-specific parameters stored in the parameter memory PAR_MEAS_DC and the circuit SCHED controlling the reprogramming.

• a) eine Leistungsmessung im Intra-Frequenz-Bereich,
• b) eine Leistungsmessung im Inter-Frequenz-Bereich innerhalb der Compressed-Mode-Lücke,
• c) eine Erkennung eines Scrambling-Codes im normalen Empfangsbetrieb (d.h. im Intra-Frequenz-Bereich) oder innerhalb der Compressed-Mode-Lücke (d.h. im Inter-Frequenz-Bereich).

The integration task performed by the PMU may concern:

• a) a power measurement in the intra-frequency range,
• b) a power measurement in the inter-frequency range within the compressed-mode gap,
• c) a recognition of a scrambling code in normal receive mode (ie in the intra-frequency range) or within the compressed-mode gap (ie in the inter-frequency range).

in the Case c) Scrambling code recognition becomes four virtual DC rake fingers RF used with two components each and those of these virtual DC rake fingers RF output symbols (each symbol is a correlation result in terms of a specific scrambling code to be checked) according to the above coherent and described performance measurement algorithm incoherent accumulated. With a correlation of the incoming signal with the "right" scrambling code in one of the virtual DC rake fingers RF will be a particularly high Performance value (correlation result), what the "correct" scrambling code is recognized.

If, in addition, the detection of the transmission mode of the relevant base station (T × div mode or normal mode) is to be carried out, for each hypothesis (T × div mode or normal mode) 4 used virtual DC rake fingers with two components each. For the performance measuring unit PMU executed in dedicated hardware, the recognition of a scrambling code is thus a normal power measurement process with several virtual DC rake fingers RF. Alternatively, it would make sense here to carry out a power measurement separately for each of the two antennas, that is, to the unit ACCU_ANT1 / 2 of FIG 2 to refrain and not perform the addition of the two antenna components.

4 shows the partitioning of the result value memory SY_BUF. The result memory SY_BUF stores the results of all tasks of all available virtual DC rake fingers RF. For this purpose, the result value memory SY_BUF 32 Memory areas (corresponding to the 32 virtual DC rake fingers) each divided into 4 (number of tasks per frame period) x 2 (number of components of a DC rake finger RF). With a word width of 16 bits for each result P of a performance measurement or scrambling code identification, the size of the result value memory SY_BUF is at least 32 × 4 × 2 × 16 bits = 4096 bits. It should be noted that no antenna-specific results are stored in the result value memory SY_BUF, since due to the accumulator ACCU_ANT1 / 2 the data path MEAS_DC_COH outputs combined integration results only for both antennas. If antenna-specific results are desired, the size of the result memory is doubled.

to Storage of the result values in the result memory SY_BUF becomes an address decoder AD DEC of the result value memory SY_BUF is driven by an address generator AD_GEN, which acts as a hardware circuit is provided in the power measuring unit PMU. As drive parameter be r, t_task_expired (time the task ended) and task_no needed. The result value memory SY_BUF is stored per frame period, e.g. once read.

It should also be noted that in addition to the module 4 For power measurement, several other dedicated hardware modules for task-specific execution of other tasks to the output 3 of the rake receiver or to the output of the antenna decoupling unit A_DEC can be connected. A data connection for coupling additional modules is in the 1 and 2 with the reference number 15 shown.

Claims (20)

Device for measuring the performance of several Signals emitted by base stations in a mobile radio receiver, wherein the mobile receiver a receiving circuit (RF) for Nutzdatendetektion, the in addition to detected user data symbols also detected symbols of provides a power measurement to be subjected signals, and the device comprising: one of the receiving circuit (RF) Downstream Hardwired Task-Specific Hardware Unit (PMU) to calculate a size that for the Power of a received signal is characteristic on the Basis of the detected provided by the receiving circuit detected Symbols, where the hardware unit (PMU) is designed, in time-division multiplex operated to measure the power of several of the received signals to be such that the power measurements of the signals respectively be executed in several steps and the hardware unit (PMU) buffer (TEMP_DCM_COMP1 / 2) to the temporary Storage of intermediate results calculated in the substeps having power measurements. Device according to claim 1, characterized in that that the hardware unit has only one signal path, which the performance measurement of all performs a power measurement to be subjected received signals. Device according to Claim 1 or 2, characterized that the receiving circuit is a rake receiver, the one in time multiplex operated physical rake finger (RF) for the demodulation of has multiple signals. Device according to one of the preceding claims, characterized characterized in that the hardware unit is a first hardware circuit (MEAS_DC_COH) to determine a coherent contribution to the calculation Size and one second hardware circuit (MEAS_DC_INCOH) for determining an incoherent contribution to the size to be calculated. Device according to one of the preceding claims, characterized characterized in that the hardware unit (PMU) is a hardwired Antenna decoupling circuit (A_DEC), in which transmit antenna-specific symbols be formed. Device according to one of the preceding claims, characterized characterized in that the device is a digital signal processor (DSP) for programming the hardware unit (PMU) with measurement parameters for signal-specific parameterization of the size to be calculated has. Device according to claim 6, characterized, that the measurement parameters one or more of the following parameters include: - one Identification number (r) of a time multiplexed, virtual rake finger (RF), - one Identification number (task_no) of a signal specific power measurement task, - an indication (t_coh) over the number of symbols that are coherent in the hardware unit (PMU) during to add a power measurement task, - an indication (t_incoh) about the number of coherent ones Addition obtained results incoherent during a power measurement task in the hardware unit (PMU), - an indication (mode) over the transmission mode of the respective base station, and - Information (task_init) via the start and end times for a computing activity the hardware circuit. Apparatus according to claim 6 or 7, characterized by a parameter memory (PAR_MEAS_DC), in which the digital signal processor (DSP) stores the measurement parameters, and from which the hardware circuit reads out the measurement parameters during programming. Method for measuring the power of several signals, which are radiated from base stations in a mobile radio receiver, wherein the mobile receiver a receiving circuit (RF) for Nutzdatendetektion, with the steps: - Detect of symbols of the signals to be subjected to a power measurement in the receiving circuit (RF); - Calculate a size that for the Power of a received signal is characteristic on the Base of the detected provided by the receiving circuit (RF) detected Symbols in a hard-wired, task-specific hardware unit (PMU), which is used to measure the power of several of the received signals is operated in time division multiplex, such that the power measurements the signals are each executed in several sub-steps and intermediate results of the power measurements calculated in the substeps in each case in temporary storage (TEMP_DCM_COMP1 / 2) of the hardware unit (PMU) temporarily get saved. Method according to claim 9, characterized, that the receiving circuit is a rake receiver with a physical Rake finger (RF) to demodulate the multiple signals is, with the step: - operate of the rake finger (RF) in time division multiplex to provide the detected Symbols of the signals to be subjected to a power measurement. Method according to claim 9 or 10, characterized the time multiplex operation of the hardware unit (PMU) is the same Multiplex cycle such as the time division multiplex operation of the rake finger (RF) has. Method according to one of claims 9 to 11, characterized that the hardware unit (PMU) for power measurement of signals from cells with which a user data exchange connection exists, and to measure the power of signals from cells being monitored are used without a Nutzdatenaustausch connection exists becomes. Method according to claim 12, characterized in that that the hardware unit (PMU) to identify the scrambling Codes of a cell is used. Method according to one of claims 9 to 13, thereby characterized in that the power measurement comprises the steps of: - Determine a coherent one Contribution to the quantity to be calculated by coherent adding of symbols; and - Determine an incoherent one Contribution to the size to be calculated by adding the at the coherent addition obtained results. Method according to one of claims 9 to 14, marked through the step - Programming the hardware unit (PMU) by means of a digital signal processor (DSP) with measurement parameters for signal-specific parameterization the size to be calculated. Method according to claim 15, characterized, that the measurement parameters one or more of the following parameters include: - one Identification number (task_no) of a signal specific power measurement task, - an indication (t_coh) over the number of symbols that are coherent in the hardware unit during to add a power measurement task, - an indication (t_incoh) about the number of coherent ones Addition obtained results incoherent during a power measurement task in the hardware unit, - an indication of the Send mode, and - Information (task_init) via the start and end times for a computing activity the hardware circuit (PMU). Method according to claim 15 or 16, characterized the digital signal processor stores the measurement parameters in a parameter memory deposits, and that the hardware circuit during programming reads out the measuring parameters from the parameter memory. Method according to one of claims 9 to 17, characterized that the quantities calculated in the hardware unit are stored in a result memory be stored, and that the result memory at regular intervals, in particular in the frame time clock, is read by the digital signal processor. Method according to one of claims 15 to 18, marked through the steps - Parameterize several independent of each other Performance measurement procedures to be performed on different base stations through the digital signal processor; Subdividing a time interval, in particular the frame period, in several sub-time intervals; and - Perform the independent of one another Performance measurement procedures for the different base stations in the sub time intervals. A method according to claim 19, characterized that the results of each power measurement procedure are the digital ones Signal processor for transmission be reported to the mobile network.