JP2003258679A - Peak detection circuit for base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use a correlation calculating unit for conducting correlation calculation, when two kinds of peaks, a peak for a preamble signal and a peak of synchronization-following for user data, are detected. <P>SOLUTION: A resource control unit 115 in a base station discriminates whether a next slot is a random access slot from mobile stations, and detects multipaths, using a path detecting device 125, if it is a random access slot (a first peak detecting circuit). If it is other than a random access slot, a path is synchronously followed for user data transmitted continuously by these mobile stations (a second peak detecting circuit). Since a first to an N-th correlation calculating units 106<SB>1</SB>to 106N in a correlation calculating device are used by switching over with these peak detecting circuits and only the necessary number of correlation calculating units are allocated for calculation by a selection signal 122, these correlation calculating units can be used effectively. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peak detection circuit for a base station, and more particularly to a peak detection circuit for estimating code generation timing on the CDMA base station side using the same spreading code as that of a mobile station.

[0002]

2. Description of the Related Art CDMA (Code Division Multiple Acc
In a communication system that employs ess (code division multiple access), each mobile station (terminal) spreads data using different spreading codes and transmits the data. As a result, the base station side receives the data in which each user data is multiplexed by the spread code.

When the base station receives the thus multiplexed data, the user data of each mobile station is delayed by a certain delay amount depending on the positions of the base station and these users. The peak detection circuit estimates the code generation timing using the same spreading code on the base station side with respect to the code generation timing of the spreading code generated at the mobile station. At this time, this timing is estimated with an accuracy within, for example, one chip of the spread code. The despreading circuit of the base station starts the despreading operation using the delay amount obtained by peak detection.

The peak detection circuit used for estimating the code generation timing as described above includes a peak detection circuit for detecting a preamble signal burst-transmitted by random access when each mobile station starts a call connection, Each terminal is composed of two types of circuits, that is, a peak detection circuit that synchronously follows user data such as voice that is continuously transmitted.

By the way, the transmission data transmitted from the mobile station reaches the base station by multipath due to factors such as obstacles existing in the middle of communication. In this case, the data sent from one mobile station to the receiving base station arrives at the base station at different timings on different routes. Therefore, in the base station, each of the multipath data is despread by the despreading circuit separately to receive the data separately, and the components of the multipath are combined at different times (rake combination). It is like this. For this purpose, it is necessary to follow a plurality of paths for each user.

As described above, the peak detection circuit in the base station has two types of configurations, a peak detection circuit for detecting a preamble signal and a peak detection circuit for synchronously following user data. The peak detection circuit of such a base station searches the entire cell for a certain amount of time to detect a multipath, which is called peak search, and a delay spread that always follows the path detected by the cell search. Peak detection called search will be performed. Therefore, a correlation calculator for calculating the correlation when these two types of peaks are detected is required. In the base station, a plurality of (N) correlation calculation units to be assigned to one user are prepared.

FIG. 5 shows a main part of a base station provided with such a conventional peak detection circuit. A transmission signal sent from a mobile station (terminal) (not shown) is received by the data receiving device 401 of the base station shown in FIG. Data receiving apparatus 401 is configured these transmission signals in first to K of the data receiving unit 402 ₁ to 402 _K for converting the baseband signal received by the antenna, respectively. First to Kth data receiving sections 402 _{1 to} 402 _K
The received data received by the data selector device 4
First to N-th data selector units 404 _{1 to} 404 _N
Are input in common, and these selections are made. These first to Nth data selector units 404
_{1 to} 404 _N convert these input data into first to Nth correlation calculation units 406 ₁ to 4 in the first correlation calculation device 405.
Output to the corresponding one of 06 _N. The first to Nth correlation calculation units 406 _{1 to} 406 _N are offset devices 408.
Corresponding ones of the outputs of the _first to N-th delay circuit units 409 _{1 to} 409 _N are also input, and these are correlated with the antenna data obtained from the antenna.

Data is input to the offset device 408 from the replica signal generator 411 for synchronization tracking. Specifically, the synchronization tracking replica signal generator 411 is the first
Synchronization tracking replica signal to N-th generation unit 412 _1-41
2 _N is provided, and a replica signal including a spreading code and pilot signal for each user is generated. The offset device 408 will give an offset as a delay amount for peak detection to the generated replica signal. The replica signal thus obtained is sent to the first correlation calculation device 405, and the correlation calculation with the antenna data (reception data) is performed.

[0009] The path detection apparatus 413 corresponding one of the first to N is composed of a path detection unit 414 ₁ ~414 _N of the correlation calculation unit 406 ₁ ~406 _N of the first to N-th correlation calculator Then, the peak having a high correlation value is set as an effective path from the correlation result. Despreader 4
Reference numeral 15 is configured to despread and decode the received data based on the path information 416 output from the _{first to} Nth path detection units 414 _{1 to} 414 _N.

The path information 416 is also input to the delay circuit controller 421. The delay circuit controller 421 is a control unit for providing path information 422 represents a delay amount for following a path in the next slot delay circuit 409 ₁ ~409 _N of the first to N in the offset device .

Each mobile station randomly accesses the base station.
Used to detect the preamble signal transmitted by
Ramble scrambling code (SCC) generator
423 is provided. Scramble for preamble
The coding code generation unit 423 uses the data selector 403.
During random access corresponding to the antenna selected in
Scrambling code 424 for the preamble signal
To generate. This scrambling code 424 is
Second, a correlation calculation for the cell radius of the base station is performed from the received signal data.
Is sent to the correlation calculation device 425 of. Second correlation calculator
425 includes a plurality of correlation calculation units 426 for receiving data
First to Kth data receiving section 402 of device ₁~ 402_KReceiving
That the data selected by the data selector unit 427
It is designed to calculate the correlation.

The calculation result of the second correlation calculator 425 is sent to the preamble detector 428, where the peak position and the signature are specified. Here, the signature is known symbol data for identifying each user, and the preamble signal is composed of a signature and a scrambling code. AICH (Aquisition Indicator Ch
annel) sending unit 429 detects the detected valid signature 4
ACK (affirmative) or NACK (negative) for 31
It is designed to output information.

A conventional base station of such a CDMA system
Then, first, the random access signal transmitted from each mobile station is
The operation of peak detection of the signal will be described. Base station ante
Data received from the data receiving device 401.
1st to Kth data receiving section 402 ₁~ 402_KBy
Converted to a band signal and sent to the data selector unit 427
To be The data selector unit 427 is the data receiving device 40.
Received signal of the antenna to be subjected to correlation calculation from the received signal from 1.
Select the issue. Scrambling code for preamble
The generator 423 selects the address selected by the data selector 427.
Scrambling code corresponding to the
2 output to the correlation calculation device 425.

In the second correlation calculating device 425, the scrambling code 424 output from the preamble scrambling code generating unit 423 is delayed for each of a plurality of correlation calculating units 426, and the received data and the scrambling code are combined. Calculate the correlation value. By using the plurality of correlation calculation units 426 in this way, peak detection is performed for the entire cell to be covered by the base station. The preamble detection unit 428 performs correlation calculation with a plurality of signatures from the correlation value for each delay amount, and specifies the signature.
The AICH transmission unit 429 detects the valid signature 4 detected.
ACK (affirmative) or NACK (negative) for 31
It will output information.

Next, a peak detection operation for synchronously following user data such as voice continuously transmitted from each mobile station will be described. In this case, the data selector device 403
To the first to Nth correlation calculation units 4 in the first correlation calculation device
User data is input to 06 _{1 to} 406 _N. The first to the synchronous follow-up for the replica signal generation unit 412 ₁ ~412 _N of the N synchronization tracking replica in the signal generator, the scrambling code for each user, the pilot signal determined for each channelization code and timeslot Generate and synthesize. Then, this is output to the offset device 408 as a replica signal.

To the offset device 408, the path information 422 representing the delay amount for following the path in the next slot is also input from the delay circuit controller 421. First through delay circuit 409 ₁ ~409 _N of the N in the offset device gives the delay amount to the replica signal based on the path information 422. Correlation calculating unit 406 ₁ ～406 _N of the first to N within the first correlation calculation device, the received data and the delay circuit 409 ₁ ～409 _N output replica signal to the first to N, there A correlation value is calculated with a delay amount within a certain range. First
~ Correlation results output from the Nth correlation calculating units 406 _{1 to} 406 _N are the first to Nth path detecting units 414 in the path detecting device.
Input to _{1 to} 414 _N. First to Nth path detection units 41
4 ₁ ~414 _N determines the effective path from correlations, and outputs the path position of the valid paths to the despreading unit 415 and the delay circuit controller 421. The despreading unit 415 performs despreading based on the valid path information and decodes user data such as voice.

On the other hand, the delay circuit control section 421 sets the delay amount of each path to be calculated in the next time slot based on the valid path information as path information 422 in the first offset device.
˜Nth delay circuit units 409 _{1 to} 409 _N are set. At this time, a correlation calculation unit for cell search and a correlation calculation unit for path tracking are assigned to each user. The delay circuit control unit 421 sets the delay amount in the delay circuit unit 409 corresponding to the correlation calculation unit for cell search with a slight shift for each time slot so as to search the entire cell. In addition, the delay circuit unit 40 corresponding to the correlation calculation unit for path tracking
In 9, the delay amount is set so that the peripheral area is always searched based on the path information of the previous slot.

[0018]

As described above, in the conventional base station shown in FIG. 5, the first correlation calculation device 405 for synchronization tracking for each user and the second correlation calculation for detection at random access. The device 425 and the device 425 were independent from each other as a device for calculating the correlation. Therefore, the first correlation calculation device 40
5 In order to perform the cell radius entire peak detection of the base station needs first to many correlators as a correlation calculating unit 406 ₁ ~406 _N of the N, further a second correlation calculation device 4
25 also requires a plurality of correlation calculation units 426.

However, in the CDMA system, the transmission timing of the preamble signal transmitted by the mobile station at the time of call connection is specified for each base station. Therefore, the conventional technique for performing correlation calculation for the preamble at a timing other than the designated timing has a problem that resources are wasted in the correlation calculation unit.

Therefore, an object of the present invention is to enable efficient use of a correlation calculation unit for performing a correlation calculation when performing two types of peak detection, that is, peak detection for a preamble signal and peak detection for synchronously tracking user data. To provide a peak detection circuit for the base station.

[0021]

According to a first aspect of the present invention, (a) random access is performed when a mobile station that spreads data using different spreading codes and transmits the data to a base station starts a call connection. A first peak detection circuit that detects multipath for a preamble signal that is burst-transmitted by, and (b) a second peak that synchronously follows the path for user data continuously transmitted by these mobile stations. A detection circuit, (c) random access slot determination means for determining whether or not the next slot is a random access slot from a mobile station, and (d) this random access slot determination means is determined to be a random access slot. In this case, a correlation calculation unit that calculates a correlation for peak detection common to the first and second peak detection circuits is provided for the first peak detection circuit. Against Ri, the second in the case of otherwise
And a resource control means allocated to the peak detection circuit of the above-mentioned one are provided in the peak detection circuit of the base station.

That is, in the invention described in claim 1, the random access slot determination means determines whether or not the next slot is a random access slot from the mobile station, and as a result, the resource control means determines the random access slot. If it is determined that the access slot is an access slot, a correlation calculation unit that calculates a correlation for peak detection common to the first and second peak detection circuits is assigned to the first peak detection circuit, and otherwise. That is, if it is determined that the slot is not a random access slot, it is assigned to the second peak detection circuit. As described above, the correlation calculation units conventionally provided independently of each other in the first and second peak detection circuits are common to both, and are allocated for tracking user data except for the slot in which random access is performed. This makes it possible to efficiently use the correlation calculation unit that performs the correlation calculation.

In the invention according to claim 2, in the peak detection circuit of the base station according to claim 1, the random access slot determination means is a random number for each access slot from the host device of the base station as subchannel information of the next slot. The available slot information indicating whether it is an access slot or not is acquired, and it is determined whether or not the next slot is a random access slot from the mobile station.

That is, according to the second aspect of the present invention, the availability slot information as the sub-channel information is used to determine whether the slot is a random access slot.

In the invention according to claim 3, in the peak detection circuit of the base station according to claim 1, a plurality of correlation calculation sections are prepared, and when the random access slot determination means determines that it is a random access slot, The resource control means is characterized by allocating a required number of correlation calculation units capable of searching the entire cell radius for the first peak detection circuit.

That is, according to the third aspect of the present invention, when the random access slot determining means determines that the random access slot is a random access slot, the resource control means first has a necessary number of correlation calculators capable of searching the entire cell radius. It will be assigned for the peak detection circuit. By selecting the required number in this way, it is possible to avoid wasteful use of the correlation calculation units even if there is a margin.

According to the invention of claim 4, in the peak detecting circuit of the base station according to claim 3, when the random access slot judging means judges that the random access slot is not a random access slot, the correlation assigned for the first peak detecting circuit. It is characterized in that the calculation unit is opened and assigned to follow the path of each user.

That is, in the invention according to claim 4, it is specified that the correlation calculation unit allocated for the first peak detection circuit is opened and allocated for the second peak detection circuit.

According to a fifth aspect of the present invention, in the peak detection circuit of the base station according to the first aspect, at least a part of a plurality of correlation calculation units has a power supply that cuts off these power supplies independently when they are not used. It is characterized in that a blocking means is provided.

That is, in the fifth aspect of the invention, the first and second peak detection circuits use a plurality of correlation calculation units at different timings, but the number of correlation calculation units used by both circuits is prepared. Considering that the number of correlation calculation units may be smaller than the number of correlation calculation units, in such a case, power is saved by shutting off the power supply of the peak detection circuit that is not used.

[0031]

DETAILED DESCRIPTION OF THE INVENTION

[0032]

EXAMPLES The present invention will be described in detail below with reference to examples.

FIG. 1 shows an essential part of a base station equipped with a peak detection circuit according to an embodiment of the present invention. A transmission signal transmitted from a mobile station (terminal) (not shown) is received by the data receiving device 101 of the base station shown in FIG. The data receiving device 101 receives the transmission signals from the antennas and converts them into baseband signals, and the first to Kth data receiving units 102 ₁ to 102 ₁
It is composed of 102 _K. Received data received by the first through the K data reception unit 102 ₁ to 102 _K of the input in common to the first through the N-th data selector 104 ₁ -104 _N of the data selector 103, the selection of these Is to be done. The first to Nth data selectors 104 _{1 to} 104 _N convert the input data into the first to Nth correlation calculation units 1 in the correlation calculation device 105.
Output to the corresponding one of 06 _{1 to} 106 _N. First
~ Nth correlation calculation units 106 _{1 to} 106 _N also input corresponding ones of the outputs of the _first to Nth selector units 108 _{1 to} 108 _N in the selector device 107, and these and antennas It is designed to be correlated with the obtained antenna data.

To the selector device 107, the data that has passed through the delay device 112 from the synchronization tracking replica signal generation device 111 is input. Specifically, the synchronization tracking replica signal generation device 111 includes first to Nth synchronization tracking replica signal generation units 113 _{1 to} 113 _N , and the resource control unit 1
Based on the user data 116 supplied from 15, a scrambling code for each user, a channelization code and a pilot signal defined for each time slot are generated and combined. Then, this is output as a replica signal. The delay device 112 similarly includes the first to
The N-th delay circuit unit 117 _{1 to} 117 _N
~ Nth synchronization tracking replica signal generation unit 113 _{1 to} 11
The replica signal correspondingly output from 3 _N and the delay information 118 from the resource control unit 115 are input. Then, the delay amount set by the resource control unit 115 is given to the replica signal, and the selector device 10
It is adapted to supply to the corresponding _one of the first to N-th selector sections 108 _{1 to} 108 _N in 7.

The base station is provided with a preamble scrambling code (SCC) generation unit 119 for detecting a preamble signal transmitted by random access when each mobile station starts a call connection. The preamble scrambling code generator 119 generates a scrambling code 121 for a preamble signal at random access, which corresponds to the antenna selected by the data selector device 103. This scrambling code 121 is used for the first to Nth selector sections 10 of the selector device.
8 _{1 to} 108 _N. First to Nth selector section 1
08 _{1 to} 108 _N are supplied with the selection signal 122 output from the resource control unit 115, and the first to N-th delay circuit units 1
Any _one of the synchronization tracking replica signals output from 17 _{1 to} 117 _N and the scrambling code 121 is selected and output to the corresponding one of the _{first to} Nth correlation calculation units 106 _{1 to} 106 _N. It is like this.

[0036] Correlation first to correlation calculating unit 106 ₁ - 106 _N of the N in the computing device, the received data and the selector device from an antenna output from the data selector 103 10
The correlation value with the replica signal or the scrambling code output from 7 is calculated for a certain search range. Thus the first to path detection unit of the first to N of the correlation result in the path detector 125 of the N correlation calculation section 106 ₁ - 106 _N of which is used for synchronization tracking of user data 1
Input to the corresponding one of 26 _{1 to} 126 _N. The 1st to N-th path detection units 126 _{1 to} 126 _N determine valid paths from the input correlation results and output path positions for each path. These outputs are input to the despreading unit 127. The despreading unit 127 is the first to Nth
The received data is despread and decoded based on the path information input from the path detectors 126 _{1 to} 126 _N.

On the other hand, the path information 129 obtained from the path detection device 125 is input to the resource control section 115. The resource control unit 115 uses this path information 1
The delay information 118 when the correlation calculation is performed in the next time slot based on 29 is used as the first to Nth delay circuit units 117 ₁ to
Set to 117 _N. The correlation result 131 of the correlation calculation device 105 assigned for the preamble is input to the preamble detection unit 132. The preamble detection unit 132 further performs correlation calculation on the correlation result 131 with a plurality of signatures, and detects an effective signature. This detected valid signature 13
3 is input to the AICH (Aquisition Indicator Channel) transmission unit 134. The AICH transmission unit 134 will output ACK (affirmative) or NACK (negative) information with respect to the valid signature.

FIG. 2 specifically shows the configuration of the resource control unit shown in FIG. Resource control unit 115
Is a random access permission determination unit 141, a correlation calculation selection unit 143 that inputs the determination result 142 of the random access permission determination unit 141 and outputs a selection signal 122,
A user setting unit 144 that outputs the user data 116 while inputting the path information 129 and a delay circuit control unit 145 that outputs the delay information 118 are provided.

Of these, the random access permission determination unit 14
1, the next time slot is granted random access
It is the part that determines whether or not the result is 1
42 is notified to the correlation calculation selection unit 143.
It The correlation calculation selection unit 143 has the first to Nth shown in FIG.
Correlation calculation unit 106₁~ 106_NFor each preamble
1 or N-th, as shown in FIG.
Lector section 108₁~ 108_NChoices for individual settings
The signal 122 is output. Also, the correlator
The calculation selection unit 143 synchronizes with the user setting unit 144.
The first to Nth correlation calculation units 106 allocated for use₁
~ 106_NThe information of is notified. A user
The setting unit 144 is the first to Nth path detection units shown in FIG.
126₁~ 126_NReceived the path information 129 from
Determine the path to follow in the next time slot. That
, The first to Nth correlation calculations assigned for synchronous tracking
Part 106₁~ 106_NFor 1st to Nth synchronization tracking
Replica signal generator 113 ₁~ 113_NAgainst the code number
The user data 116 such as the number is output. Well
In addition, the delay circuit control unit 145 in the resource control unit 115
Notify path information etc. The delay circuit controller 145
The first to the first from the path information and the like input from the setting unit 144
N delay circuit section 117₁~ 117_NAgainst the next time
Delay information 1 that sets the delay amount to follow in a slot
18 will be output.

The resource control unit 115 having such a configuration
Is composed of a CPU (central processing unit) (not shown), a storage medium such as a semiconductor memory storing a control program, and the like. The CPU functionally realizes each unit shown in FIG. 2 by executing this control program. Of course, it is not necessary to implement all the units of the resource control unit 115 by software, and it is possible to implement some or all of them by hardware.

FIG. 3 shows the operation flow of this resource control unit. Resource control unit 11 shown in FIG.
5 acquires available slot information as subchannel information of the next slot from a host device (not shown) of the base station (step S201). Here, the host device may be, for example, an RNC (Radio Network Controller). Also, the available slot information refers to information indicating whether each access slot is a random access slot.

When the resource control unit 115 obtains the available slot information, the random access permission determination unit 1
At 41, it is determined whether or not the next slot is a random access slot from the mobile station (step S202).
When the random access permission determination unit 141 determines that the next slot is a random access slot from the mobile station (Y), the correlation calculation selection unit 143 causes the first to Nth correlation calculation devices 105 in the correlation calculation device 105 illustrated in FIG. Correlation calculation unit 106 _1-
A correlation calculator for random access is initially assigned from 106 _N (step S203).

In this embodiment, N is stored in the correlation calculation device 105.
(Where N is an integer of 2 or more) correlation calculation units 106
_{It is} assumed that _{1 to} 106 _N exist. In this case, the number of assigned random access correlation calculation units 106 is fixed to M. However, the numerical value M is an integer smaller than the numerical value N. Next, the correlation calculation selection unit 143 calculates the number U of users who follow synchronization (step S204). Then, a selection signal for allocating the correlation function unit 106 is assigned to each user so that the correlation calculation unit 106 that can be used for synchronization tracking by the number obtained by subtracting the value M from the value N is assigned to each of the U users. Generate (step S20
5). Now, assuming that resources are evenly allocated to each user, the number of correlation calculation units 106 per user C
₁ can be expressed by the following equation (1).

C ₁ = (NM) / U (pieces) (1)

The user setting section 144 shown in FIG.
Indicated received path information 129 before the slot from the first to N-th path detection unit 126 ₁ - 126 _N in, performs ranking valid paths (step S206). And
From among them, the correlation function unit 1 assigned to each user
The path to be followed in the next slot is set according to the number of 06 (step S207). The number of paths to follow in the next slot is P _1, and the correlation function unit 10 to be assigned per path
When the number of 6 is T, the number of following paths P ₁ as paths to follow in the next slot can be expressed by the following equation (2).

P ₁ = C ₁ / T = [(NM) / U] / T (2)

Based on the path information to be followed, the user setting section 144 allocates the correlation function section 106 as the cell search correlation calculating section C _c and the path following correlation calculating section C _d (step S208).

On the other hand, if it is determined in step S202 that the next slot is not the random access slot from the mobile station, that is, if random access is not permitted (N), the current slot is used for random access. The existing correlation calculation unit is opened (step S209).
Then, set to use all the correlation calculation unit 106 ₁ - 106 _N of the first to N in the correlation computing unit 105 for synchronization tracking user data.

In this case, the correlation calculation selection unit 143 calculates the number U of users who follow the synchronization in the next slot (step S2).
10), the correlation calculation units 106 _{1 to} 106 _N are evenly assigned to each user, and the selection signal 122 is generated to use the correlation calculation unit 106 (step S211). In this case, the number C ₂ of the correlation calculation units 106 per user can be expressed by the following equation (3).

C ₂ = N / U (pieces) (3)

The user setting unit 144 shown in FIG. 2 similarly receives the first through path detector 126 _1-126 from _N previous slots path information 129 of the N shown in FIG. 1 and described in step S206 Then, the effective paths are ranked (step S212). In this embodiment, the released correlation calculation unit 106 is assigned to the cell search correlation calculation unit,
The resource efficiency for cell search is improved. Therefore, the number of correlation calculation units 106 assigned as the cell search correlation calculation unit is given by the following equation (4) per user.

C _c + M / U (4)

The user setting unit 144 sets the user data for cell search in the increased correlation calculation unit 106 (step S213). Regarding the number of paths for delay spread, the number of follow-up paths P ₁ is selected from valid paths (step S214), and user data is similarly set (step S215).

The above step S208 or step S
After the processing of 215 is completed, the delay circuit control unit 145 shown in FIG. 2 changes the user setting unit 144 to the correlation calculation unit 106.
Receives setting information for each preamble or for synchronization tracking. In the case of setting information for synchronization tracking, setting information for cell search or delay spread search is further received. Also, the path delay amount of the preceding slot of the following path and the delay amount setting value of the preceding slot of the cell search are received.
Since the delay circuit section paired with the correlation calculation section 106 assigned for the preamble is not used, basically no delay amount is set. The delay circuit for delay spread search is set so that the path delay amount of the preceding slot is at the center of the delay width in which correlation calculation can be performed by one correlation calculation unit 106. For the delay circuit for cell search, an amount obtained by adding a constant value to the delay amount of the previous slot is set (step S216). Here, the constant value corresponds to a delay width in which the correlation calculation unit 106 for cell search can perform correlation calculation in one time slot. By continuously setting the delay amount also in the correlation calculation unit 106 increased for cell search, the search range in one slot is widened.

FIG. 4 shows an example of the timing when the resource control unit sets the user data. FIG. 7A shows each time slot. In this figure, the hatched time slots are slots for which random access is permitted by the available slot information, and the other time slots are slots for which random access is not permitted. FIG _{(b 1) ~ (b N} ) shows a first to timing of the processing of the correlation calculation section 106 ₁ - 106 _N of the N in the correlation computing device shown in FIG. 1, respectively selection signal 122, The user data 116 and the random access setting data 152 are shown.

The selection signal 122 is output from the resource control unit 115 shown in FIG. 1 to the correlation calculation unit 106 assigned for random access. For example, time t
_When the time slot from ₁ to time t ₂ and the time slot from time t ₄ to time t ₅ are random access permitted, the second correlation calculation unit 106 ₂ and the Nth correlation calculation unit 1
For 06 _N , the selection signal 122 is output in the time slot from time t ₁ to time t ₂ . For the time slot from time t ₄ to time t ₅ , the selection signal 122 is output for the second correlation calculation unit 106 _{2 and} is not output for the Nth correlation calculation unit 106 _N.

The correlation calculation unit 106 assigned for random access sets the scrambling code for the preamble. As for this, all mobile stations use random access setting data 15 having the same code.
2 will be used. On the other hand, when searching the user data 116 such as voice, the correlation calculation unit 106 makes different settings for each user. That is, the correlation calculation unit 106 sets the scrambling code and the spreading code for each user as the user data 116.

Deformability of the invention

In the embodiment described above, the correlation calculation device 10
The first to the required number of correlation calculation section 106 ₁ - 106 _N of the N in 5 only has been decided to perform peak detection and selection, all of these first through correlation calculation section 106 ₁ - 106 _N of the N Alternatively, a power supply cutoff control unit that cuts off the power supplies individually may be provided in part. In this case, for example, in FIG.
The power supply to the correlation calculation units 106 other than those assigned in step S205 or step S211 can be cut off. As a result, it is possible to reduce the power consumption of the peak detection circuit when performing the peak detection operation.

[0060]

As described above, claims 1 to 5 are as follows.
According to the invention described above, a resource control means is provided, and it is determined whether or not the next slot is a random access slot from a mobile station, and allocation is performed regarding the use of a plurality of correlation calculation units according to the contents. I chose Since the correlation calculation unit is shared by the two peak detection circuits as described above, these correlation calculation units can be used efficiently and the cost of the peak detection circuit of the base station can be reduced.

Further, according to the invention of claim 5, the power supply can be cut off independently for at least a part of the plurality of correlation calculation units, so that the power supply of the unused correlation calculation units can be used. Can be shut off,
This will contribute to the reduction of the overall power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a base station including a peak detection circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram specifically showing the configuration of a resource control unit shown in FIG.

FIG. 3 is a flowchart showing an operation flow of a resource control unit of this embodiment.

FIG. 4 is a timing explanatory diagram showing an example of a timing when a resource control unit sets user data.

FIG. 5 is a block diagram showing a main part of a base station including a conventional peak detection circuit.

[Explanation of symbols]

101 Data receiving device 105 Correlation calculator 106 correlation calculator 111 Synchronous tracking replica signal generator 115 resource control unit 116 User data 119 Preamble scrambling code generator 122 selection signal 125 path detector 141 Random access permission determination unit 143 Correlation calculation selection unit 144 user setting section

Claims (5)

[Claims] 1. Multipath detection is performed on a preamble signal that is burst-transmitted by random access when a mobile station that spreads data using different spreading codes and transmits the data to a base station starts a call connection. A first peak detection circuit, a second peak detection circuit that synchronously follows the path to user data continuously transmitted by these mobile stations, and whether the next slot is a random access slot from the mobile station. Random access slot determination means for determining whether or not, and when this random access slot determination means determines that it is a random access slot, a correlation for peak detection common to the first and second peak detection circuits is calculated. Correlation calculation unit is allocated for the first peak detection circuit, and is otherwise allocated for the second peak detection circuit. And a resource control means for controlling the peak detection circuit of the base station. 2. The random access slot determining means obtains, from the host device of the base station, available slot information indicating whether each access slot is a random access slot as sub-channel information of the next slot, and thereby obtains the next available slot information. The peak detection circuit of the base station according to claim 1, wherein it is determined whether or not the slot is a random access slot from a mobile station. 3. A plurality of the correlation calculation units are prepared,
When the random access slot determination unit determines that the random access slot is a random access slot, the resource control unit allocates a required number of correlation calculation units capable of searching the entire cell radius for the first peak detection circuit. The peak detection circuit of the base station according to claim 1. 4. When the random access slot determination means determines that the random access slot is not a random access slot, the correlation calculation unit assigned to the first peak detection circuit is opened and assigned to follow a path for each user. The peak detection circuit for a base station according to claim 3. 5. A plurality of the correlation calculation units are provided, and at least a part of them is provided with a power supply cutoff unit that cuts off the power supply of each of them when not in use. Alternatively, the peak detection circuit of the base station according to claim 3.