JP2000324031A - Antenna controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna controller that receives Ach data by applying decimation control to switching of sector antennas, decides Ach data with the highest reception level among the received Ach data and whose base station identification code is authenticated (at a low error rate) or the like and uses the sector antenna able to receive the decided Ach data to communicate with a base station. SOLUTION: Decimation control is applied to sector antennas 201 at an interval of one antenna, received Ach data (base station identification code or the like), its reception timing (deviation of a terminal station timing with respect to base station timing) are detected, a reception level and a sector number are efficiently retrieved and a control section 213 sequentially reads them to decide the Ach data with the highest reception level among the received Ach data and whose base station identification code is authenticated or the like (at a low error rate), a switch 203 is thrown to the position of the sector able to receive the decided Ach data, the deviation in the detected reception timing is corrected and frame synchronization to the base station is established. Thus, the Ach retrieval time can be reduced to a half of that of a conventional controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna control device for a communication terminal device such as a portable telephone, and more particularly, to reduce power consumption in initial synchronization acquisition by thinning out switching of sector antennas having n-directional directivity. Things.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a configuration of a conventional antenna control device. In FIG. 2, a conventional antenna control apparatus includes a sector antenna 201 configured by an antenna having directivity (having six sectors in the example), a sector switch 202 for selecting any one sector of the sector antenna 201, An RF unit 203 that converts a burst received by any one sector of the antenna 201 from a radio frequency to a baseband signal, a demodulation unit 204 that performs demodulation processing using a baseband signal from the RF unit, and a digital signal from the demodulation unit. A channel decoding unit 205 for performing error correction decoding on the signal, a reception data buffer unit 206 for storing reception data, and a known transmission pattern (unique word pattern: hereinafter referred to as UW) from the demodulated digital signal. .), And U generated when UW is detected by the UW detection unit. The detection signal (214), the reception timing detecting section 20 which latches the counter value output of the timing counter of the timing control unit 212 (215) to detect the reception timing
8, a reception timing buffer unit 209 for storing the reception timing detected by the reception timing detection unit,
RSSI (Receive Signal Storage Indic) from RF unit
ator) A reception level detection section 210 for detecting a reception level from the signal (216), a reception level buffer section 211 for storing the detected reception level, and a timing control for generating a timing signal required for each block. Part 212
And a control unit 213 equipped with a CPU and the like for controlling the entire apparatus.

[0003] Control of a conventional antenna control device as shown in FIG. 2 will be described. It is necessary to perform frame synchronization acquisition on the base station when the power of the communication terminal device is activated and when synchronization is lost.

[0004] Frame synchronization acquisition is performed by receiving an access channel (hereinafter abbreviated as Ach) constantly transmitted from a base station.

[0005] A communication terminal device sequentially performs Ach transmitted by a base station in the vicinity of its own station in a continuous reception mode (random timing) at predetermined time intervals in all directions (all sectors) of a sector antenna. Ach search operation is performed and one or more Ach is received.

[0006] The received Ach data (base station identification code, etc.), detection of the reception timing (the deviation of the terminal station timing from the base station timing) and the reception level are stored in the buffers 206, 209 and 211, respectively, and the control unit 213 sequentially controls them. By reading the A channel, the reception level is the highest among the received A channels, and the base station identification code can be authenticated (low error rate).
The channel is determined, the switch 202 is switched to a sector in which the Ach can be received, the detected reception timing deviation is corrected, and the frame synchronization with the base station is established.

[0007]

However, in such a conventional antenna control apparatus, in the initial synchronization acquisition operation, the continuous reception mode is set, all the blocks in the apparatus are turned on, and then the sector control is performed. The receiving operation is sequentially performed for all the sectors of the antenna regardless of the presence or absence of the Ach, and the capturing operation for the base station is always performed, so that the power consumption is lost due to the receiving operation in the sector where the Ach cannot be received at all. I do.

[0008] In order to solve the above-mentioned problem, the present invention thins out the switching of sector antennas, receives Ach,
An Ach that has the highest reception level among the received Achs and that can authenticate the base station identification code or the like (low error rate) and communicates with the base station using a sector antenna that the Ach can receive. It is an object to provide a control device.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an antenna control apparatus for acquiring initial synchronization, in which a sector switch for selecting one of sector antennas having n-directional directivity is switched. The access channel is received by performing the decimation control, and the access channel having the highest reception level among the received access channels and having a low error rate is determined. It is characterized by communicating with a base station.

[0010] By doing so, the switching of the sector antenna of the communication terminal apparatus is thinned out for Ach transmitted from an arbitrary base station.
Since the Ach search operation can be simplified, low power consumption can be realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an antenna control apparatus for performing initial synchronization acquisition.
Access channel reception is performed by controlling the switching of the sector switch for selecting one of the sector antennas having n-directional directivity, and the access channel having the highest reception level among the received access channels and having the low error rate is accessed. A channel is determined, and the antenna control device is characterized by performing communication with a base station via an antenna at a sector position where the determined access channel can be received. On the other hand, by controlling the switching of the sector antennas, the Ach
Since the search operation can be simplified, power consumption can be reduced.

The invention described in claim 2 is the first invention.
A communication terminal device including the antenna control device described in the above description. By performing thinning control of sector antenna switching at the time of initial frame synchronization acquisition, it becomes possible to simplify the Ach search operation, thereby reducing power consumption. Has the effect of being able to provide a communication terminal device that can realize the above.

[0013] Further, the invention according to claim 3 is based on claim 2.
A base station device that communicates with the communication terminal device described in the above description. Ach search operation can be simplified by thinning-out control of sector antenna switching at the time of initial frame synchronization acquisition, thereby reducing power consumption. Has the effect of providing a base station apparatus that can realize the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart for explaining an antenna control apparatus according to an embodiment of the present invention. By the way, the configuration of the antenna control device according to the present invention is the same as that shown in FIG. In the description of the present embodiment, the number of sectors of the sector antenna is assumed to be 6, and the thinning-out control of the sector switch switching is described every other interval. However, the spirit of the present invention is not limited to this embodiment.

In FIG. 1, the communication terminal apparatus starts frame synchronization acquisition for the base station when the power is turned on and when synchronization is lost due to a communication line abnormality.

First, from the control unit 213 to the timing control unit 212
, Information setting for controlling generation of the timing signal of each block is performed. As a result, the radio frequency is set for the RF unit 203 as the frequency channel designation (101), the operation mode in the device is set to the continuous reception mode (102), and the base station near the own station transmits. The broadcast channel (Ach) can be received.

Then, the timing control section 212 controls the sector switch section 202 to thin out switch switching at a fixed period (for example, in the case of a 6-sector antenna shown in FIG. 2, instead of searching Ach in all sectors, # 1 → # 3 → # 5
And end the search sector in half. )
Then, the Ach search operation is started.

When a continuous reception operation (Ach search operation) is performed at # 1 of the sector antenna 201, the sector switch 202 is set to #.
Switch to 1 (104). And # of sector antenna 201
The RF unit 203 converts the received data from 1 into a baseband signal. Then, the demodulation unit 204 performs demodulation processing, and the UW detection unit 207 performs UW (unique word) detection.

Only the received data for which a unique word has been detected is subjected to error correction processing by the channel decoding unit 205, and the data is stored in the received data buffer 206. At the same time, the timing control unit 2 receives the unique word detection signal (214).
The counter value (215) from 12 is latched and stored in the buffer 209 as the reception timing of the reception signal.

Further, the RSSI signal (21
6) The reception level is also measured at the same time by the buffer 211.
To be stored. Thus, the sector antenna 201 #
By performing a receiving operation at a random timing for a certain period with respect to 1, information of all received Ach is stored in each buffer as needed.

Ach in one sector # 1
After the search operation is completed (105), the control unit 213 sequentially receives Ac from each buffer (data, timing, level).
Reads the h information (106), checks the error of the received data (DATA) (107), authenticates the base station identification code (108), updates the maximum reception level (LEVO) (109, 110), and detects the maximum reception level (111) of the reception timing (t0) and the update of the sector number when the maximum reception level is detected (112).

Thereafter, switching (114) of the sector antenna is performed, the sector antenna # 3 is set, and the same operation as described above is performed.

Thus, in the embodiment of the present invention,
A is controlled by thinning out every other sector antenna.
ch data (base station identification code, etc.), reception timing (terminal station timing deviation from base station timing)
Efficiently search for detection, reception level and sector number,
The Ach having the highest reception level among the received Achs and enabling the authentication of the base station identification code or the like (low error rate) is determined by sequentially reading out the Achs, and the switch to the sector in which the Ach can be received is performed. And corrects the detected reception timing deviation to establish frame synchronization with the base station. As a result, the Ach search operation can be performed in the conventional 2
It can be reduced by a factor of one.

[0025]

As is apparent from the above description, according to the present invention, when the power is turned on and the synchronization is broken due to an abnormal communication line, the sector antenna control is thinned out without performing the receiving operation over all the sectors. Therefore, there is an excellent effect that power consumption due to useless receiving operation can be suppressed and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining the operation of an antenna control device according to an embodiment of the present invention;

FIG. 2 is a block diagram illustrating a configuration of an antenna control device according to the related art and the present invention.

[Explanation of symbols]

 101 Specifying frequency 102 Specifying continuous reception mode 103 Substituting 0 for maximum reception level (LEVO) 104 Specifying sector number as 1 105 Ach search completion determination for fixed period 106 Ach information read 107 Receive data error check 108 Base station identification code check 109 Reception level judgment 110 Maximum reception level update 111 Reception timing update 112 Sector number update 113 Read completion judgment 114 Sector number increment 115 Sector number threshold judgment 201 Sector antenna unit 202 Sector switch unit 203 RF unit 204 Demodulation unit 205 Channel decoding unit 206 Reception data buffer unit 207 UW detection unit 208 Reception timing detection unit 209 Reception timing buffer unit 210 Reception level detection unit 211 Reception level buffer unit 212 Timing control unit 213 Control unit 214 UW detection signal 215 Counter value 216 RSSI signal

Claims (3)

[Claims] In an antenna control apparatus for acquiring initial synchronization, a switching of a sector switch for selecting one of n-directional sector antennas is thinned out to control reception of an access channel, and the received access channel is received. An antenna control apparatus for determining an access channel having the highest reception level and a low error rate among the above, and communicating with a base station via an antenna at a sector position where the determined access channel has been successfully received. 2. A communication terminal device comprising the antenna control device according to claim 1. 3. A base station apparatus for performing communication with the communication terminal apparatus according to claim 2.