JP2010028855A - Mobile communication system and radio terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high-certainty channel control and excellent transmission quality by being flexibly adaptive to various system configurations regarding a mobile communication system and radio terminal device for receiving reception waves coming in parallel from a plurality of radio stations in a radio transmission system, and applying processing to the reception waves on the basis of channel control procedures. <P>SOLUTION: In the mobile communication system which includes a plurality of base stations and the radio terminal device and in which the radio terminal device can receive signals from the plurality of base stations in a handover, each of the plurality of base stations includes a transmission means for transmitting a downlink signal to the radio terminal device. The radio terminal device includes: a reception means for receiving in parallel a first downlink signal and other downlink signal, having time deviation, coming through a radio transmission line; and a processing means for processing the other downlink signals, received within a predetermined time after the first downlink signal is received, as a target of reception processing and generating a transmission power control signal in accordance with a state of receiving the downlink signal defined as the processing target. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mobile communication system and a radio terminal apparatus that receive received waves coming in parallel from a plurality of radio stations in a radio transmission system and process these received waves based on a channel control procedure.

  The CDMA (Code Division Multiple Access) method is a multiple access method that inherently has confidentiality and interference resistance, and that can suppress co-channel interference and efficiently reuse radio frequencies. In recent years, the CDMA system has been actively applied to mobile communication systems because the establishment of technology that achieves transmission power control with high accuracy and responsiveness has enabled flexible setting of radio transmission characteristics for each sector zone. It is being done.

FIG. 9 is a diagram illustrating a configuration example of a mobile communication system to which the CDMA scheme is applied.
In the figure, two radio base stations (BTS) 71-1 and 71-2 are connected via a communication link (not shown), and form radio zones 72-1 and 72-2, respectively. A mobile station (MS) 73-1 is located in an area where the radio zones 72-1 and 72-2 overlap with each other, and an area which does not overlap with the radio zone 72-1 in the radio zone 72-2. Mobile stations (MS) 73-2 to 73-4 are located.

FIG. 10 is a diagram illustrating a configuration of a mobile station.
In the figure, a mobile station 73-1 is directed to an antenna 81-1, an antenna interface unit 82-1 having an antenna terminal connected to the feeding end of the antenna 81-1, and a radio base station 71-1-71-2. Is connected in cascade between the output of the transmission information generating unit 83-1 and the input of the antenna interface unit 82-1. Spreading unit 84-1, quadrature modulation unit 85-1, and transmission unit 86-1, and reception unit 87-1 cascaded to the output of antenna interface unit 82-1, orthogonal demodulation unit 88-1, and despreading unit 89 −1, a demodulator 90-1 that is arranged downstream of the despreading unit 89-1 and outputs “downlink transmission information”, and an output of the orthogonal demodulator 88-1 together with the despreading unit 89-1 The reception timing detection unit 91-1 directly connected to the reception timing detection unit 91-1 is cascaded. And one output connected to one control input of the spreading unit 84-1, and the other input of the CDMA control unit 92-1 together with the control input of the despreading unit 89-1. In addition to the first input, the reception timing detection is performed together with the second and third inputs connected to the outputs of the despreading unit 89-1 and the demodulation unit 90-1, respectively, and the input of the CDMA control unit 92-1. A fourth input connected to the output of the unit 91-1, and the control input of the transmission information generation unit 83-1, the orthogonal modulation unit 85-1, and the transmission unit 86-1, and the spreading unit 84-1 The received signal processing unit 93-1 having four outputs individually connected to the other control input.

Since the configurations of the mobile stations 73-2 to 73-4 are the same as the configuration of the mobile station 73-1, in the following, suffix numbers “2” to “4” are respectively added to the corresponding components. The same reference numerals are given, and the description and illustration are omitted here.
In the mobile communication system having such a configuration, as shown in FIGS. 11 (1) and 11 (2), the radio base stations 71-1 and 71-2 are
・ Broadcast information and other control information to be used for channel control in addition to frame numbers SFN that are sequentially updated in a cyclical manner such as “0”, “1”,..., “36863”, “0”,. Including
-Transmitting wave signals P1 and P2 modulated with a sequence of frames (hereinafter referred to as "downlink frames") having a constant word length are respectively transmitted to specific radio channels.

The word length described above is assumed to correspond to 10 milliseconds (hereinafter referred to as “frame length T _F ”) under a predetermined transmission rate.
In the following description, the transmission wave signals P1 and P2 and the specific radio channel described above are referred to as “broadcast signal” and “control channel”, respectively.
Furthermore, for the sake of simplicity, it is assumed that this “broadcast signal” is transmitted by the radio base stations 71-1 and 71-2 with a prescribed transmission power and is not subject to transmission power control described later.

In addition, for the specific radio channel described above, for the sake of simplicity, the mobile stations located in the radio zones 72-1 and 72-2 are acquired based on the procedure prescribed by the system or included in the broadcast signal. It is assumed that it is a “perch channel” obtained as information.
On the other hand, in the mobile station 73-1, for example, a completed call that has occurred in its own station continues, and a call signal or the like is transmitted / received via some wireless channel formed with the wireless base station 71-1. Even during this period, the receiving unit 87-1 arrives at the antenna 81-1 from the radio base station 71-2 and receives the notification signal P2 given through the antenna interface unit 82-1 (FIG. 11 ( 3)) is converted into a predetermined intermediate frequency signal.

It should be noted that the above-described link operation of each unit related to the transmission / reception of the call signal is not related to the present invention, and therefore, detailed description thereof is omitted here.
The orthogonal demodulator 88-1 generates two baseband signals orthogonal to each other in the baseband region by performing orthogonal demodulation on the intermediate frequency signal. The despreading unit 89-1 performs a despreading process on these baseband signals based on a predetermined despread code. The demodulator 90-1 obtains “downlink transmission information” by performing a predetermined demodulation process on the signal despread in the transmission band in the despreading process. In addition, the reception timing detection unit 91-1 obtains the above-described frame sequence.

The received signal processing unit 93-1 performs frame synchronization with the frames included in the “downlink transmission information” and extracts the frame numbers SFN included individually in these frames. Further, the received signal processing unit 93-1 calculates a difference from the time when the SFN is “0” from the frame number SFN extracted in this manner, and the time t at the head of the frame where the SFN is “0”. ₀ to get hold.

The CDMA control unit 92-1 mainly performs processing related to channel control, and controls the operations of the despreading unit 89-1 and the spreading unit 84-1 under the channel control, and also receives the signal processing unit. The operation of the transmission information generation unit 83-1, the spreading unit 84-1, the orthogonal modulation unit 85-1, and the transmission unit 86-1 is controlled in conjunction with the 93-1.
Of the matters related to such channel control, the description of matters not related to the present invention is omitted.

Also, the processing to be performed in the transmission information generation unit 83-1, the spreading unit 84, the orthogonal modulation unit 85-1, and the transmission unit 86-1, respectively, is a demodulation unit 90-1, a despreading unit 89-1, and an orthogonal demodulation. Since the processing is reversible with respect to the processing performed as described above in the unit 88-1 and the receiving unit 87-1, detailed description thereof will be omitted below.
The CDMA control unit 92-1 is located in a region where the wireless zone 72-1 and the wireless zone 72-2 overlap each other and the above-described completed call continues, FIG. As shown, a transmission signal TX1 modulated with a sequence of frames (hereinafter referred to as “uplink frames”) appropriately including timing correction values T _DHO described later is transmitted.

Here, the timing correction value T _DHO is relative to the time point t _t at which transmission of the transmission signal TX1 described above at which SFN = 0 is to be started and the time point t _{0 described} above.
T _DHO = t _t -t ₀
Is given by
Note that the details of the processing to be performed by the CDMA control unit 92-1 to determine the time point at which the transmission signal TX1 is to be transmitted are omitted here for the sake of simplicity and will be described later. .

  In addition, the above-described downlink frame and uplink frame are actually configured as a sequence of time slots generated by dividing the corresponding frame into 16 equal parts and generated in a predetermined format, as shown in FIG. In the following description, individual time slots constituting a downlink frame are referred to as “downlink slots”, and individual time slots constituting an uplink frame are referred to as “uplink slots”.

By the way, the timing correction value _TDHO shown by the above equation is obtained by _calculating “the phase difference between the notification signal P2 arriving at the mobile station 73-1 from the radio base station 71-2 and the transmission signal TX1” on the time axis. It shows with.
Therefore, the propagation delay time D1 of the radio transmission path from the radio base station 71-1 to the mobile station 73-1 and the propagation delay time D2 of the radio transmission path from the radio base station 71-2 to the mobile station 73-1 The phase difference δ, which is the sum of the phase difference corresponding to the difference between and the phase difference of the transmission waves of the radio base stations 71-1 and 71-2, is an uplink link (mobile station 73-1) in these radio transmission paths. To the radio base stations 71-1 and 71-2) and the time axis of the frame to be transmitted on the downlink (from the radio base stations 71-1 and 71-2 to the mobile station 73-1). If the phase difference d above is known,
δ = T _DHO −d
Is given by

The phase difference d described above is assumed to be a value “1024” times the chip rate for simplicity.
The radio base station 71-1 receives the transmission signal TX1 described above from the mobile station 73-1, and during a period during which diversity handover should be performed for the corresponding completed call, the timing correction value T included in the transmission signal TX1. _{The DHO} is extracted, and the timing correction value T _DHO (including the identification information of the corresponding call) is notified to the radio base station 71-2 via the communication link described above.

The radio base station 71-2 rounds the phase deviation indicated by the timing correction value T _DHO with the accuracy of the unit period of the symbol for a call to which such timing correction value T _DHO is given via the communication link. This ensures the orthogonality of the spreading code to be used for transmission. Furthermore, the radio base station 71-2 should be used for diversity handover when the above-described phase difference δ is compressed with the accuracy of the timing correction value t _DHO ( _{≈T DHO} ) obtained as a result of the rounding. The phase of a frame to be transmitted subsequent to the radio channel (when transmission is started) is set.

Therefore, as shown in FIGS. 13 (1) and (2), the mobile station 73-1 transmits a frame (time slot) of a call signal in parallel with a deviation less than the symbol period described above on the time axis. Arriving from both base stations 71-1 and 71-2 almost simultaneously.
In the mobile station 73-1, the receiving unit 87-1, the orthogonal demodulating unit 88-1, the despreading unit 89-1, the demodulating unit 90-1, and the received signal processing unit 93-1 arrive in parallel in this way. Frames to be received in parallel under the control of the CDMA control unit 92-1.

In the mobile station 73-1, the reception timing detector 91-1 detects the field strengths of the downlink slots received from the radio base stations 71-1 and 71-2 as described above, and uses a predetermined algorithm. Determine a reference point in time. The CDMA control unit 92-1 identifies a time point determined relative to the reference time point as a transmission time point.
Note that the calculation procedure and calculation target to be performed in order to determine the transmission time point in this way are not the features of the present invention, and various known techniques can be applied. Description is omitted.

  Further, the CDMA control unit 92-1 is linked to the reception signal processing unit 93-1 and the spreading unit 84-1, so that the call signal to be transmitted to the radio base stations 71-1 and 71-2 is addressed to any one of them. Transmission of an upstream slot (frame) including any one or both of control information related to channel control of a call corresponding to the above-mentioned one of the downstream slots ( By providing the transmission unit 86-1 with a level adapted to the value of the TPC bit included in the frame), transmission power control necessary for solving the perspective problem specific to the CDMA system is performed.

  By the way, in the conventional example described above, the transmission characteristics of the radio transmission path formed between the radio base stations 71-1 and 71-2 and the mobile station 73-1 are generally the movement of the mobile station 73-1 and Despite the fact that it changes every moment according to the location, shape, etc. of the terrain and features on the wireless transmission path and multipath may occur, the reference time point determined based on the predetermined algorithm described above On the other hand, the transmission time was determined relatively.

Therefore, when the variation in the transmission characteristics of the wireless transmission path is small enough to be allowed, the transmission power control is stably performed with high accuracy based on the TPC bits described above, and the wireless base station 71-1, A sufficient amount of processing required for processing related to channel control to be performed in 71-2 is secured stably.
On the other hand, however, in a state where the transmission characteristics of the wireless transmission path vary significantly, the transmission time point is determined based on the reference time point determined based on the above-described algorithm even if a downlink slot that arrives in advance is received. Either or either of the radio base stations 71-1 and 71-2 may not secure a processing amount required for processing to be completed before subsequently transmitting any downlink slot.

Further, even if a downlink slot that arrives after such a reference time is received, there is a possibility that a sufficient amount of processing required for processing related to channel control cannot be secured for the uplink slot.
Furthermore, such a state where the amount of processing becomes insufficient is generally more likely to occur as the symbol rate is set to a smaller value.

Therefore, in the conventional example, effective use of the radio frequency adapted to the amount of transmission information to be transmitted may be hindered, or restrictions may be imposed on the design of the system adapted to the zone configuration, channel arrangement, and other combinations. Was high.
An object of the present invention is to provide a radio communication system and a radio terminal apparatus that can be flexibly adapted to various configurations of a system and achieve high-accuracy channel control and good transmission quality.

  The invention according to claim 1 includes a plurality of base stations and radio terminal apparatuses, and in a mobile communication system in which the radio terminal apparatuses can receive signals from the plurality of base stations at the time of handover, Each has a transmission means for transmitting a downlink signal to the wireless terminal device, and the wireless terminal device parallels the first downlink signal and other downlink signals that have a deviation in the time of arrival via the wireless transmission path. And receiving means for receiving and processing the other downlink signal received within a predetermined time after receiving the first downlink signal as a target of reception processing, and depending on the reception state of the downlink signal to be processed And processing means for generating a transmission power control signal.

  According to a second aspect of the present invention, in a radio terminal apparatus in a mobile communication system having a plurality of base stations and capable of receiving signals from the plurality of base stations at the time of handover, the time of arrival via the radio transmission path is determined. A receiving means for receiving a first downlink signal with a deviation and another downlink signal in parallel, and another downlink signal received within a predetermined time after receiving the first downlink signal is processed as a reception processing target. And processing means for generating a transmission power control signal according to the reception state of the downlink signal to be processed.

FIG. 1 is a block diagram showing the principle of first to sixteenth techniques related to the present invention.
The first technique related to the present invention is a receiving means 11 for receiving in parallel a plurality of received waves having time deviations arriving via a wireless transmission path; and a plurality of received waves received by the receiving means 11 Among these, channel control means 12 that performs processing based on the channel setting procedure for any received wave, and a transmission wave that indicates a response to the received wave that is the target of processing performed by the channel control means 12 is a wireless transmission path. The channel control means 12 is a channel control method in which both the time required for processing and the time required for processing to be applied to the transmission wave by the radio station facing each other via the wireless transmission path A period adapted to the transmission method of this wireless transmission path is given in advance, and the received wave received by the receiving means 11 during that period is selected as the object of this processing. It is characterized in.

According to a second technique related to the present invention, in the first technique related to the present invention, the channel control means 12 is configured to make a relative to a point in time when a specific received wave is received by the receiving means 11 among a plurality of received waves. A period is given in advance as a typical time.
According to a third technique related to the present invention, in the first or second technique related to the present invention, the receiving means 11 calculates the time and transmission quality or electric field strength received individually for a plurality of received waves. The channel control unit 12 measures and transmits the transmission wave as a relative value with respect to a time point equal to the average value of the product sum of the time and the transmission quality or the electric field strength measured by the receiving unit 11 during a predetermined period. The transmission means 13 transmits the transmission wave at the time determined by the channel control means 12.

According to a fourth technique related to the present invention, in the second or third technique related to the present invention, the plurality of received waves arrive individually and sequentially in a cycle having the same nominal value, and the period precedes It is characterized in that following a time point when a plurality of received waves individually arrive in a cycle, these received waves are given as a subset of periods during which the receiving means 11 can receive them.
According to a fifth technique related to the present invention, in the second or third technique related to the present invention, the plurality of received waves individually and sequentially arrive at a common period having the same nominal value. It is characterized in that it is given as a subset of a period from the time when a plurality of received waves arrived most recently in the preceding period.

  According to a sixth technique related to the present invention, in the first to fifth techniques related to the present invention, the channel control means 12 is applied to the received wave received by the receiving means 11 based on a channel control procedure. The time required for the processing to be performed and the time required for the processing to be performed by the radio station opposite to the response transmitted by the transmission means 13 under the procedure of the processing via the wireless transmission path are obtained. Among these, the received wave is processed during a period in which the required time is a value adapted to the channel control method.

  The seventh technology related to the present invention is the sixth technology related to the present invention, the processing to be performed on the received wave by the receiving means 11 and the transmission means 13 transmitted under the procedure of the processing. The time required for the response and / or the processing to be performed by the opposite radio station via the radio transmission path changes according to an event that can be identified by the channel control means 12 in the course of channel control. The means 12 is characterized in that both or one of the required times is obtained according to the event identified based on the channel control procedure.

According to an eighth technique related to the present invention, in the sixth technique related to the present invention, the channel control means 12 allows the lowering of the transmission speed of the wireless transmission path and / or the deviation of the received wave. The time required for the processing to be performed on the received wave received by the receiving means 11 based on the channel control procedure is obtained with the accuracy to be obtained.
According to a ninth technique related to the present invention, in any one of the first to eighth techniques related to the present invention, the channel control means 12 constitutes a reception means 11, a channel control means 12 and a transmission means 13. Among the elements, the operation of elements that are not subjected to processing to be performed on the received wave received by the receiving means 11 based on the channel control procedure is regulated in the course of the processing.

  The tenth technology related to the present invention is the ninth technology related to the present invention, in the ninth technology related to the present invention, elements that are not subjected to processing to be applied to the received wave received by the receiving means 11 based on the channel control procedure are as follows: Among the elements constituting the receiving means 11, the channel control means 12, and the transmitting means 13, an element that is not subjected to processing for obtaining both or one of the period adapted to the transmission method of the wireless transmission path and the base point of the period It is characterized by being.

  According to an eleventh technique related to the present invention, in any one of the first to tenth techniques related to the present invention, the plurality of received waves individually include control information related to transmission power control and have a nominal value. The channel control unit 12 sequentially performs transmission power control adapted to control information included in a specific received wave among a plurality of received waves that have arrived in the preceding cycle. 13 is performed through both or any one of them.

  A twelfth technology related to the present invention is the technology according to any one of the first to eleventh technologies related to the present invention, in which the channel control means 12 is operated by the receiving means 11 for each radio zone based on the zone configuration and the channel arrangement. It is characterized in that the transmission quality or electric field strength of the received wave received is monitored, and the channel control relating to the radio zone having the maximum transmission quality or electric field strength is performed.

A thirteenth technique related to the present invention demodulates all or part of a received wave that is a target of processing performed by the channel control means 12 in any one of the first to twelfth techniques related to the present invention. Or demodulating means 21 for obtaining transmission information by demodulating under a predetermined weighting.
A fourteenth technology related to the present invention is the one of the first to twelfth technologies related to the present invention, wherein a plurality of signals arrived via a wireless transmission path and received in parallel by the receiving means 11. A demodulating means 31 is provided, which obtains transmission information by demodulating all or part of the received wave or demodulating it with a predetermined weight.

According to a fifteenth technology related to the present invention, in any one of the first, second, fourth to twelfth technologies related to the present invention, the channel control means 12 determines a time point at which a transmission wave should be transmitted to a wireless transmission path. The obtaining and transmitting means 13 transmits the transmission wave at the time point obtained by the channel control means 12.
According to a sixteenth technology related to the present invention, in the fifteenth technology related to the present invention, the time point at which the transmission wave should be transmitted to the wireless transmission path can be identified by the channel control means 12 in the course of channel control. The channel control means 12 is characterized in that it determines a time point at which a transmission wave should be transmitted in response to an event identified based on a channel control procedure.

In the wireless terminal apparatus according to the first technique related to the present invention, the receiving means 11 receives in parallel a plurality of received waves having time deviations coming via the wireless transmission path. The channel control means 12 performs processing based on the channel control procedure on any one of the received plurality of received waves.
The transmission means 13 transmits a transmission wave indicating a response to the reception wave that is the object of the processing to the wireless transmission path.

  Further, the channel control means 12 is adapted to the channel control method in both the time required for the processing described above and the time required for the processing to be performed on the transmission wave described above by the radio station facing through the radio transmission path. A period that is a value and is adapted to the transmission method of the wireless transmission path is given in advance. Further, the channel control unit 12 sets the reception wave received by the reception unit 11 during the period among the plurality of reception waves described above as a target of this process.

In other words, the received wave to be subjected to the process related to the channel control has arrived via wireless transmission in a period in which the processing amount related to the channel control is ensured at both the receiving end and the transmitting end of the received wave. Limited to received waves.
Therefore, channel control is stably performed with high accuracy as compared with the conventional example in which such a received wave is not limited at all.

In the wireless terminal apparatus related to the second technique related to the present invention, in the first technique related to the present invention, the channel control means 12 receives a specific received wave from the plurality of received waves by the receiving means 11. A period is given in advance as a relative time with respect to the received time.
That is, the received wave to be subjected to the process related to channel control is specified through a simple window in the time domain as long as the time point at which the above-described specific received wave is received is given.

Therefore, compared to the first technique related to the present invention, simplification of processing and improvement of responsiveness can be achieved.
In the wireless terminal device related to the third technique related to the present invention, in the first or second technique related to the present invention, the receiving means 11 receives the time and transmission quality individually received for a plurality of received waves. Alternatively, the electric field strength is measured. The channel control means 12 obtains a time point at which the transmission wave is to be transmitted as a relative value with respect to a time point equal to the average value of the product sum of the time measured in a given period and the transmission quality or electric field strength. The transmission means 13 transmits a transmission wave at the time point thus obtained.

The calculation for obtaining the average value of the product sum described above is equivalent to weighted integration in which the time given in the order of time series corresponds to the weighted transmission quality or electric field strength given together with the time. Even when the frequency fluctuates rapidly, the time point at which the transmission wave should be transmitted to the wireless transmission path is stably maintained.
In the wireless terminal apparatus according to the fourth technique related to the present invention, in the second or third technique related to the present invention, the plurality of received waves arrive individually and sequentially in a cycle having the same nominal value.

In addition, the period is given as a subset of periods in which these received waves can be received by the receiving means 11 following the point in time when these received waves individually arrive in the preceding period.
That is, among the plurality of received waves that have arrived via the wireless transmission path, the received waves to be processed by the channel control means 12 in the channel control arrive in a period given at an interval substantially equal to the period of these received waves. Limited to received waves.

Therefore, compared with a case where such a period is not limited at all based on the above-described period, a decrease in transmission quality and service quality due to interference and disturbance on the wireless transmission path is suppressed.
In the wireless terminal device related to the fifth technique related to the present invention, in the second or third technique related to the present invention, the plurality of received waves sequentially and individually arrive at a common period having the same nominal value. To do.

Also, the period is given as a subset of the period from the time when these received waves arrived most recently in the preceding cycle.
That is, among the plurality of received waves that have arrived via the wireless transmission path, the received wave to be subjected to the processing related to the channel control by the channel control means 12 is given under a simple timing, and the period of these received waves. It is limited to received waves that arrive during a period given by an interval approximately equal to.

Therefore, compared with the wireless terminal device according to the fourth aspect related to the present invention, the configuration can be simplified, and transmission quality caused by interference and disturbance on the wireless transmission path in the same manner as the wireless terminal device can be obtained. Deterioration of service quality is suppressed.
In the wireless terminal device related to the sixth technique related to the present invention, in any one of the first to fifth techniques related to the present invention, the channel control means 12 applies a channel to the received wave received by the receiving means 11. The time required for processing to be performed based on the control procedure, and the time required for processing to be performed by the radio station facing the response transmitted by the transmitting means 13 under the processing procedure via the wireless transmission path, Ask for.

Further, the channel control means 12 performs processing on the received waves received during a period in which each required time is a value adapted to the channel control method among these received waves.
That is, the processing performed by the channel control means 12 based on the channel control procedure is performed stably by maintaining the above-described load of the radio station appropriately, so that performance and service quality are maintained high.

  In the radio terminal apparatus according to the seventh technique related to the present invention, in the sixth technique related to the present invention, the process to be performed on the received wave by the receiving means 11 and the transmission means under the procedure of the process The time required for the response transmitted by 13 and / or the process to be performed by the opposite radio station via the radio transmission path depends on the event that can be identified by the channel control means 12 in the course of channel control. Change.

The channel control means 12 obtains both or one of the required times described above according to the event identified based on the channel control procedure.
That is, even if the above-mentioned required time differs depending on the operating status of the system, the radio zone to be accessed by the radio terminal device according to the present invention, the radio channel, etc., the factor is the process of the above-described channel control. As long as it is identified as an event, it can be determined flexibly with the desired accuracy.

In the radio terminal apparatus according to the eighth technology related to the present invention, in the sixth technology related to the present invention, the channel control means 12 performs both of the decrease in the transmission speed of the radio transmission path and the deviation of the received wave or The time required for the process to be performed on the received wave received by the receiving means 11 based on the channel control procedure is determined with an accuracy that either one is allowed.
In other words, the time required for the processing to be performed on the received wave by the channel control means 12 is such that even if the wireless terminal device according to the present invention is moving, the performance is reduced due to the decrease in the transmission speed. It is easily obtained without being generated.

Therefore, the hardware and software configurations can be simplified as compared with the sixth technology related to the present invention.
In the wireless terminal device related to the ninth technique related to the present invention, in any of the first to eighth techniques related to the present invention, the channel control means 12 includes the receiving means 11, the channel control means 12 and the transmission. Among the elements constituting the means 13, the operation of the elements not subjected to the process to be performed on the received wave received by the receiving means 11 based on the channel control procedure is restricted during the process.

That is, since unnecessary power consumption is suppressed, the reliability is improved and the running cost can be reduced as compared with the first to eighth techniques related to the present invention.
In the wireless terminal apparatus related to the tenth technology related to the present invention, in the ninth technology related to the present invention, the processing to be performed on the received wave received by the receiving means 11 based on the channel control procedure Among the elements constituting the receiving means 11, the channel control means 12 and the transmitting means 13, the elements that are not provided are obtained either and / or one of the period adapted to the transmission method of the wireless transmission path and the base point of the period. It is an element that is not used for processing.

That is, unnecessary power consumption can be reduced by elements not constituting the channel control means 12 that are not subjected to the internal processing for obtaining the above-described period and / or the starting point of the period.
Therefore, the reliability can be improved and the running cost can be reduced as compared with the ninth technique related to the present invention.

  In the wireless terminal device related to the eleventh technology related to the present invention, in any of the first to tenth technologies related to the present invention, the plurality of received waves individually include control information related to transmission power control. And sequentially arrive at a period with a common nominal value. The channel control unit 12 performs transmission power control adapted to control information included in a specific received wave among a plurality of received waves that have arrived in the preceding period, and / or performs either or both of the receiving unit 11 and the transmitting unit 13. Do through.

That is, since the transmission power control is performed at a higher speed as the above-described period is shorter, the present invention can be applied to a wireless transmission system to which a CDMA system with inherent perspective problems is applied.
In the wireless terminal apparatus according to the twelfth technology related to the present invention, in any of the first to eleventh technologies related to the present invention, the channel control means 12 is configured to set each radio zone based on the zone configuration and the channel arrangement. In addition, the transmission quality or the electric field strength of the received wave received by the receiving means 11 is monitored, and the channel control relating to the radio zone having the maximum transmission quality or electric field strength is performed.

That is, since a radio zone having a high transmission quality or electric field strength of an incoming received wave is subject to channel control, the present invention can be applied to a mobile communication system in which the transmission characteristics of the radio transmission path can change every moment.
In the wireless terminal device according to the thirteenth technique related to the present invention, the demodulation means 21 is the target of the processing performed by the channel control means 12 in any of the first to twelfth techniques related to the present invention. The transmission information is obtained by demodulating all or part of the received wave or demodulating it under a predetermined weight.

That is, transmission information is obtained by demodulating a received wave that arrives with high electric field strength and transmission quality, so that transmission quality and service quality are maintained high.
In the wireless terminal apparatus according to the fourteenth technology related to the present invention, in any of the first to twelfth technologies related to the present invention, the demodulation means 31 arrives via the wireless transmission path and receives the receiving means. The transmission information is obtained by demodulating all or a part of the plurality of received waves received in parallel by 11 or demodulating under a predetermined weight.

That is, since the transmission information is restored under a desired demodulation process, the first to twelfth techniques related to the present invention can be applied to various wireless transmission systems.
In the radio terminal apparatus according to the fifteenth technology related to the present invention, in any one of the first, second, fourth to twelfth technologies related to the present invention, the channel control means 12 transmits a transmission wave to the radio transmission line. Find the point in time to be done. Further, the transmission means 13 transmits the transmission wave at the time point thus obtained.

That is, the process to be performed by the channel control unit 12 based on the channel control procedure includes the above-described process for obtaining the time point. Therefore, as long as the process procedure is surely given, various zone configurations and channel arrangements are possible. Flexible adaptation to hardware and software configurations is possible.
In the wireless terminal apparatus according to the sixteenth technology related to the present invention, in the fifteenth technology related to the present invention, the time point at which the transmission wave should be transmitted to the wireless transmission path is determined by the channel control means 12 in the channel control process. Depending on the events that can be identified by.

The channel control means 12 obtains a time point at which the above-described transmission wave should be transmitted according to the event identified based on the channel control procedure.
That is, even when the time point at which the transmission wave should be transmitted to the wireless transmission path differs depending on the operating status of the system, the wireless zone to be accessed by the wireless terminal device according to the present invention, the wireless channel, etc. As long as the factor is identified as an event in the above-described channel control process, it can be determined flexibly with a desired accuracy.

As described above, in the present invention, channel control is stably performed with high accuracy as compared with the conventional example.
Further, according to the present invention, it is possible to simplify processing and improve responsiveness.
Furthermore, in the present invention, even when the transmission characteristic of the wireless transmission path is suddenly changed, the time point at which the transmission wave should be transmitted to the wireless transmission path is stably maintained.

Further, according to the present invention, it is possible to suppress a decrease in transmission quality and service quality due to interference and interference on the wireless transmission path.
Furthermore, in the present invention, the configuration can be simplified.
In the present invention, performance and service quality are maintained high.
Furthermore, according to the present invention, it is possible to flexibly adapt to the operating status of the system, the wireless zone to be accessed by the wireless terminal device according to the present invention, the wireless channel, and other factors.

In the present invention, the hardware and software configurations can be simplified.
Furthermore, according to the present invention, the reliability can be improved and the running cost can be reduced.
Further, according to the present invention, the reliability is improved and the running cost can be reduced.
Furthermore, in the present invention, the present invention can be applied to a wireless transmission system to which transmission power control is performed at a high speed and to which a CDMA system that inherently has a near-far problem is applied.

Moreover, in the present invention, the present invention can be applied to a mobile communication system in which the transmission characteristics of the wireless transmission path can change every moment.
Furthermore, in the present invention, transmission quality and service quality are maintained high.
In the present invention, the above-described first to twelfth techniques can be applied to various wireless transmission systems.

Furthermore, according to the present invention, it is possible to flexibly adapt to various hardware and software configurations together with various zone configurations and channel arrangements.
Therefore, wireless transmission systems to which these inventions are applied flexibly adapt to the multiple access schemes and modulation schemes to be applied, without imposing significant restrictions on the hardware and software configurations, and transmit. A stable communication path with high quality is ensured.

It is a principle block diagram of the 1st thru | or 16th technique relevant to this invention. It is a figure which shows 1st thru | or 6th embodiment of this invention. It is a figure explaining operation | movement of 1st embodiment of this invention. It is an operation | movement flowchart of 1st and 4th embodiment of this invention. It is a figure explaining operation | movement of 3rd embodiment of this invention. It is a figure which shows the structure of a monitoring time correction table. It is an operation | movement flowchart of 6th embodiment of this invention. It is a figure explaining operation | movement of the 6th embodiment of this invention. It is a figure which shows the structural example of the mobile communication system to which the CDMA system was applied. It is a figure which shows the structure of a mobile station. It is a figure which shows the flame | frame structure transmitted / received via a wireless transmission path. It is a figure which shows the structure of a time slot. It is a figure which shows the downstream slot which arrives late at a mobile station.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 2 is a diagram showing the first to sixth embodiments of the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 10 are denoted by the same reference numerals, and description thereof is omitted here.
The difference between the present embodiment and the conventional example shown in FIG. 10 is the configuration of mobile stations 61-1 to 61-4 provided in place of the mobile stations 73-1 to 73-4 shown in FIG. .

The difference in configuration between the mobile station 61-1 and the mobile station 73-1 is that a CDMA control unit 62-1 is provided instead of the CDMA control unit 92-1, and a reception timing detection is performed instead of the reception timing detection unit 91-1. Unit 63-1, a reception signal processing unit 64-1 is provided instead of the reception signal processing unit 93-1, and the control input of the reception timing detection unit 63-1 corresponds to the CDMA control unit 62-1 The control output is connected, and the corresponding output of the reception signal processing unit 64-1 is connected to the specific control input of the CDMA control unit 62-1.
Since the configuration of the mobile stations 61-2 to 61-4 is the same as that of the mobile station 61-1, the same reference numerals with "2" to "4" are given to the corresponding components. The description and illustration are omitted here.
Further, the configuration of the mobile communication system that provides communication services to the mobile stations 61-1 to 61-4 having such a configuration is basically the same as the conventional example shown in FIG.

Therefore, here, reference numerals “61-1” to “61-4” are appended to the mobile stations 73-1 to 73-4 shown in FIG. 9, respectively, and the same reference is made below. .
Furthermore, regarding the correspondence between this embodiment and the block diagram shown in FIG. 1, the antenna 81-1, the antenna interface unit 82-1, the receiving unit 87-1, the orthogonal demodulating unit 88-1, and the despreading unit 89-1 Corresponds to the reception timing detection unit 63-1 and the reception unit 11, and the CDMA control unit 62-1 and the reception signal processing unit 64-1 correspond to the channel control unit 12, and includes a transmission information generation unit 83-1 and a spreading unit 84. -1, the orthogonal modulation unit 85-1, the transmission unit 86-1, the antenna interface unit 82-1 and the antenna 81-1 correspond to the transmission unit 13, and the demodulation unit 90-1 corresponds to the demodulation units 21 and 31.

FIG. 3 is a diagram for explaining the operation of the first embodiment of the present invention.
FIG. 4 is an operation flowchart of the first and fourth embodiments of the present invention.
The operation of the first embodiment of the present invention will be described below with reference to FIGS. 2 to 4 and FIG.
The reception signal processing unit 64-1 includes an antenna interface unit 82-1, a reception unit 87-1, an orthogonal demodulation unit 88-1, a despreading unit 89-1, a demodulation unit 90-1, and a reception timing detection unit 63-1. The “downlink transmission information” obtained by linking in the same manner as in the conventional example is taken in and synchronized with the individual downlink slots included in the “downlink transmission information”.

Further, the reception signal processing unit 64-1 individually identifies the time points indicating the beginning (end) of these downlink slots, and notifies the CDMA control unit 62-1 of these time points sequentially.
On the other hand, the time point notified in this way to the CDMA control unit 62-1 is as follows.
Processing performed on information contained in the corresponding downlink slot based on the channel control procedure (not only internal processing performed only by the CDMA control unit 62-1, but also linkage with the received signal processing unit 64-1, etc. Including the processing performed under
An uplink slot containing information to be transmitted to a radio base station (not only a radio base station that forms a radio zone in which the own station is located, but also a radio base station that can be a transfer destination by handover) Frame) generation and transmission, and
The time required for the destination radio base station to reliably receive such an uplink slot and to perform processing based on the channel control procedure on the uplink slot while guaranteeing desired response and service quality;
Is given as a relative value with respect to a time point that can be the head of the succeeding uplink slot as shown in FIG. 3 (which may be a period following the time slot length (= 625 μs) or more) that satisfies the conditions for ensuring all The time t _W (= T _F / 16−τ) is given in advance.

Note that, regarding the value of such a monitoring time t _W , the zone configuration of the mobile communication system to which the present invention is to be applied, the channel arrangement, the amount of information to be transmitted / received via the radio transmission path, the format, and the transmission speed In addition, the value is set in advance as a value adapted to the processing amount of hardware installed in the mobile stations 61-1 to 61-4 and the radio base stations 71-1 and 71-2 and the form of function or load distribution. The

As described above, when the reception signal processing unit 64-1 notifies a certain time point in advance for each time slot period, the CDMA control unit 62-1 starts the monitoring time t _W described above. A control signal indicating a period extending over is provided to the reception timing detector 63-1 (FIG. 4 (1)).
The reception timing detection unit 63-1 is configured to receive a downlink slot (formed in the radio transmission path) received from both or one of the radio base stations 71-1 and 71-2 only during the period indicated by the control signal. When a single frame is received as a received wave that arrives at a different time due to multipath or the like, all of these downlink slots are included.) (Hereinafter referred to as “reference time point”) _tr is detected.

CDMA controller 62-1 specifies the point in time which is determined relatively in the same manner as in the conventional example with respect to the reference time point t _r as transmission time.
Further, the CDMA control unit 62-1 communicates with the reception signal processing unit 64-1 and the spreading unit 84-1 in the same manner as the conventional example, so that the call to be transmitted to the radio base stations 71-1 and 71-2. Any of the transmissions of the uplink slot including the signal and any control information related to the channel control of the call corresponding to one of the destinations at the transmission time described above and received in advance The transmission power control is performed by giving the transmission unit 86-1 a level adapted to the value of the TCP bit included in the downlink slot.

As described above, according to the present embodiment, the predetermined processing for the information included in the downlink slot received in advance is completed in a period adapted to the system configuration and specifications.
Therefore, the service quality is maintained higher than in the conventional example in which the reference time _tr can be set at a time other than the monitoring time t _W described above.
In the present embodiment, the above-described transmission power control is performed. However, such transmission power control corresponds to a process to be performed based on a channel control procedure, but a near-far problem or a decrease in transmission quality. When the present invention is applied to a wireless transmission system that permits the above, it may not be performed.

Also, in the present embodiment, the received wave (the combination of frames included in “downlink transmission information”) to be demodulated by the demodulator 90-1 is not specifically shown.
However, for example, the reception signal processing unit 64-1 notifies the CDMA control unit 62-1 by giving the monitoring time t _W to the demodulation unit 90-1 and the despreading unit 89-1 together with the control signal described above. Only the received wave received during the period from the point in time to the monitoring time t _W may be subject to demodulation, or all reception regardless of the monitoring time t _W as in the conventional example. Waves may be subject to demodulation.

Further, in the present embodiment, the processing to be performed based on the channel control procedure by the CDMA control unit 62-1 is not specifically shown as the reference for calculating the monitoring time t _W described above. In the case where the process for determining is performed under program control instead of dedicated hardware, the processing amount of the process may be taken into account as a reference for calculating the monitoring time t _W.

The operation of the second embodiment of the present invention will be described below with reference to FIG.
Difference between this embodiment and the first embodiment described above, the operation of the following by the receiving timing detecting part 63-1 performs, in a procedure of a process of CDMA controller 62-1 obtains the reference time point t _r is there.
The reception timing detector 63-1 is a downlink slot that is received from both or one of the radio base stations 71-1 and 71-2 only during the period indicated by the control signal given by the CDMA controller 62-1. Are received at times t _{1 to} t _n (hereinafter referred to as “individual time points”).

The reception timing detecting section 63-1 for these individual reception time t ₁ ~t _n, column combination of measured field strength _{e 1 ~e n (t 1,} e 1), ..., ( t _n, sequentially notifies the CDMA controlling part 62-1 as e _n).
The CDMA control unit 62-1 performs processing for these combinations of columns.

の式で示されるように、電界強度を重みとする重み付き平均値として基準時点ｔ_rを求める。
さらに、ＣＤＭＡ制御部６２-1は、この基準時点ｔ_rに基づいて先行して既述の第一の実施形態と同様にして送信時点を特定する。

As shown in the equation, the reference time _tr is obtained as a weighted average value with the electric field strength as a weight.
Furthermore, CDMA controller 62-1 specifies the transmission time in the same manner as in the first embodiment described above prior based on the reference time t _r.

As described above, according to the present embodiment, the reference time point is given as an average value that is weighted more as the electric field strength of these downlink slots is greater when the plurality of downlink slots are individually received.
Therefore, the mobile station 61-1 moves in accordance with the change in the topography and the features intervening in the wireless transmission path formed between the mobile station 61-1 and the wireless base stations 71-1 and 71-2. Even when the transmission characteristics of the wireless transmission path vary greatly, it is avoided that the reference time point changes rapidly, and the accuracy of channel control and call quality are kept stable and high.

In the present embodiment, although the electric field strength e ₁ to e _n described above is applied as weights, instead of these field strength e ₁ to e _n, or with these field strength e ₁ to e _n, Transmission quality (e.g., given as a syndrome or a bit error rate) determined in the course of a decoding process adapted to the transmission path coding method may be applied as a weight.
FIG. 5 is a diagram for explaining the operation of the third embodiment of the present invention.

The operation of the third embodiment of the present invention will be described below with reference to FIGS.
The difference between this embodiment and each of the above-described embodiments lies in the following processing procedure performed by the CDMA control unit 62-1 to generate a control signal to be given to the reception timing detection unit 63-1.
The reception signal processing unit 64-1 takes “downlink transmission information” in the same manner as in the above-described embodiment, and synchronizes with individual frames included in the “downlink transmission information”.

Further, the received signal processing unit 64-1 identifies the time point indicating the end of each frame based on the frame number SFN included individually and the known configuration, and sends the time point to the CDMA control unit 62-1. Notify sequentially.
Further, CDMA controller 62-1, immediately after the own station has transitioned to the standby state in any wireless zone, prior art or in the same manner as any of the above embodiments, to obtain the reference time point t _r The relative transmission time with respect to the reference time is obtained.

Note that the CDMA control unit 62-1 is notified first by the reception signal processing unit 64-1 for each downlink slot period when the transmission time point is specified in the same manner as in any of the above-described embodiments. A control signal indicating a period from the time point to the above-described monitoring time t _W is given to the reception timing detection unit 63-1.
In the following, it is assumed that the number of downlink slots received by the reception timing detection unit 63-1 during the period indicated by the control signal is “N” for simplicity.

After performing the above-described operation over the period of a single downlink slot, the CDMA control unit 62-1 performs the reception signal processing unit 93-1 as shown by shading in FIG. A period (hereinafter referred to as “provisional period”) consisting of a set of subsequent periods (T _F / 16−m _N ) to (T _F / 16 + m _P ) on the time axis is identified for each notified time point. To do.
Further, as shown in FIG. 5, the CDMA control unit 62-1 controls the control signal indicating a period corresponding to the period from the beginning of the provisional period to the above-described monitoring period t _W. Is given to the reception timing detector 63-1.

_{M N} and m _P are both positive numbers, and the lower limit of the deviation of the period of the downlink slot (= T _F / 16) allowed as long as the above-described condition for giving the monitoring time t _W is satisfied. Indicates the absolute value of the value and the upper limit.
That is, downlink slot should identify the field strength to the timing detection unit 63-1 detects a reference time point t _r is approximately received again after the period of a single downlink slot over the prior to the received downlink slot It is limited to the downlink slot.

According to this embodiment, since the reference time point t _r due to sudden fluctuations and overreach other transmission characteristics of the radio transmission path is suppressed can vary improperly, the good transmission quality The channel control is performed stably.
In the present embodiment, the CDMA control unit 62-1 sends a control signal indicating a period corresponding to the period extending to the above-described monitoring period t _{W from} the beginning of the provisional period. This is given to the reception timing detection unit 63-1.

However, instead of such a period, for example, a control signal indicating a period corresponding to a period extending from the beginning of the period to the monitoring period t _W in a period continuous from the beginning to the end of the provisional period. The process may be simplified by being given to the reception timing detection unit 63-1.
In the present embodiment, the absolute values m _N and m _P described above are not specifically shown.

However, these absolute values m _N and m _P may be any values as long as they conform to the system configuration and specifications and are reliably given in advance.
The operation of the fourth embodiment of the present invention will be described below with reference to FIGS.
The difference between the present embodiment and the above-described embodiments lies in the following processing procedure performed by the CDMA control unit 62-1.

In a specific storage area of the main memory of the CDMA control unit 62-1, as shown in FIG.
A processing identifier ID _P indicating an item of processing to be performed based on the channel control procedure;
Part processing identifier ID monitoring time combination of coefficients Δt to be applied is pre-registered in order to correct the above-described monitoring time t _W to a value that accommodates the processing amount required for the process shown by _P correction table 62A Is placed.

The coefficient value Δt is given as a positive number or a negative number adapted to a processing amount set in advance as a premise for calculating the monitoring time t _W.
In addition, with regard to such a processing amount, in addition to the processing amount of processing performed only by the CDMA control unit 62-1, by coordinating with the CDMA control unit 62-1, each unit sharing a predetermined load or function Response time variation is included.

  The CDMA control unit 62-1 includes the “downlink transmission information” included in each downlink slot obtained by the despreading unit 89-1 and the “downlink transmission information” included in the downlink slot obtained by the demodulation unit 90-1. "Transmission information" and whether or not these downlink slots contain control information related to channel control, or whether the state of received waves (quality and distribution) requires a change in processing time. It discriminate | determines (FIG. 4 (a)).

Furthermore, when the determination result is true, the CDMA control unit 62-1 analyzes the corresponding control information or the state of the received wave, and specifies the item of processing to be performed according to the control information. Then, the coefficient value registered in the monitoring time correction table 62A is acquired together with the process identifier indicating the item (FIG. 4B) (FIG. 4C).
Further, the CDMA control unit 62-1 applies a correction value given as the sum of the monitoring time t _W and the coefficient value thus obtained instead of the above-described monitoring time t _W (FIG. 4). (d)).

That is, the monitoring time t _W is appropriately updated according to the increase / decrease in the amount of processing to be performed according to the control information included in the received downlink slot.
Therefore, according to the present embodiment, compared with the case where the monitoring time t _W is not updated at all, a decrease in responsiveness and transmission quality is mitigated, and flexible channel control based on various procedures can be achieved.

In the present embodiment, neither the processing item corresponding to the processing identifier ID _P nor the accuracy of the coefficient value Δt is specifically shown.
However, as long as the monitoring time t _W is updated with desired accuracy and precision within the range of the storage capacity and the processing amount of the main memory of the CDMA control unit 62-1, the form of these processing items and the coefficient value Δt The accuracy of may be set in any way.

The operation of the fifth embodiment of the present invention will be described below with reference to FIGS.
The difference between the present embodiment and the above-described fourth embodiment is the following processing procedure performed by the CDMA control unit 62-1.
The main memory of the CDMA control unit 62-1 includes
Despreading unit 89-1, reception timing detection unit 63-1, transmission information generation unit 83-1, spreading unit 84-1, orthogonal modulation unit 85-1, transmission unit 86-1, and reception signal processing unit 64-1 Control target identifier id _C indicating all or part of
The beginning (or end) of the upstream slot to be transmitted to the radio base stations 71-1 and 71-2, or the head of the downstream slot received from these radio base stations 71-1 and 71-2 ( Alternatively, the restriction period information id _P is given as a relative value with respect to the time point (hereinafter referred to as “reference point”) and indicates the period during which the operation of each part individually indicated by the control target identifier id _C is restricted. Doo is previously stored monitoring time correction table 62B associated individually aforementioned processing identifier ID _P is arranged in place of the monitoring time correction table 62A.

When the CDMA control unit 62-1 identifies the processing identifier ID _P in the same manner as the above-described fourth embodiment of the present invention, the control registered in the monitoring time correction table 62B corresponding to the processing identifier ID _P. It acquires the regulatory period information id _P target identifier id _C.
Further, the CDMA control unit 62-1 includes a despreading unit 89-1, a reception timing detection unit 63-1, a transmission information generation unit 83-1, a spreading unit 84-1, an orthogonal modulation unit 85-1, and a transmission unit 86−. 1 and the reception signal processing unit 64-1, all or a part of the control target identifier id _C is controlled over a period given by the control period information id _P relative to the reference time. .

As described above, according to the present embodiment, in the course of processing to be performed based on the channel control procedure in accordance with the downlink slot received in advance from the radio base stations 71-1 and 71-2, it does not operate. The operations of the respective units may be regulated under the initiative of the CDMA control unit 62-1.
Therefore, power consumption is reduced compared to the case where no such operation restriction is performed, and the time during which a communication service is continuously provided without charging the battery is increased.

In this embodiment, the control target identifier id _C includes a despreading unit 89-1, a reception timing detection unit 63-1, a transmission information generation unit 83-1, a spreading unit 84-1, and an orthogonal modulation unit 85-1. In addition, an identifier indicating any one of the transmission unit 86-1 and the reception signal processing unit 64-1 is included.
However, a plurality of identifiers are included in the control target identifier id _C , and an identifier indicating a period in which the operation should be restricted for each part individually indicated by these identifiers is included in the restriction period information id _P so that each part is useless. The power that can be consumed may be more accurately saved.

In the present embodiment, the despreading unit 89-1, the reception timing detection unit 63-1, the transmission information generation unit 83-1, the spreading unit 84-1, the orthogonal modulation unit 85-1, the transmission unit 86-1, and the reception the signal processing unit 64-1, fully operational over a period of time indicated by the restriction period information id _P is restricted.
However, these operation restrictions may be appropriately performed in units of modules in which unnecessary processing or power consumption is performed in hardware or software.

FIG. 7 is an operation flowchart of the sixth embodiment of the present invention.
FIG. 8 is a diagram for explaining the operation of the sixth embodiment of the present invention.
Hereinafter, the operation of the sixth embodiment of the present invention will be described with reference to FIG. 2, FIG. 7, and FIG.
The difference between the present embodiment and the first to fifth embodiments described above is that the CDMA control unit 62-1 performs the following processing procedure and each unit performed under the control of the CDMA control unit 62-1. It is in operation.

In the mobile station 61-1, for example, during a period in which the mobile station searches for a wireless zone to be shifted to a standby state or a wireless zone to be a handover destination, the receiving unit 87-1 is configured to receive the wireless base station 71-1. , 71-2 are received in parallel for each downlink slot, and the electric field strengths of these downlink slots are measured together.
Further, such a broadcast signal is transmitted by the radio base stations 71-1 and 71-2 with a constant transmission power whose nominal value is known by the radio terminal apparatus, and is not subject to the transmission power control described above.

The reception timing detection unit 63-1 appropriately notifies the CDMA control unit 62-1 while identifying the electric field strength of these broadcast signals (downlink slots) for each radio zone (radio base station).
The CDMA control unit 62-1 integrates these electric field strengths in parallel for each radio zone (radio base station) (FIG. 7 (1)), and between the radio base stations 71-1 and 71-2. Among the formed wireless transmission paths, a wireless transmission path that gives the maximum value as a result of the integration is selected (FIG. 7 (2)).

  Further, the CDMA control unit 62-1 includes a reception unit 87-1, an orthogonal demodulation unit 88-1, a despreading unit 89-1, and a demodulation unit 90 together with the reception timing detection unit 63-1 and the reception signal processing unit 64-1. −1, the transmission information generating unit 83-1, the spreading unit 84-1, the quadrature modulation unit 85-1, and the transmission unit 86-1, so that it is received via the wireless transmission path thus selected. And the first to fifth embodiments described above with reference to the beginning or end time point of the downlink slot included in the downlink frame (refer to FIG. 7 (3)). Similar processing is performed.

That is, at the transmission time point of the downlink slot to be transmitted by the mobile station 61-1 based on the channel control procedure, a radio transmission path with good transmission quality is formed among the plurality of radio base stations 71-1 and 71-2. It is determined with high accuracy on the basis of the downlink slot that arrives from the radio base station.
Therefore, according to the present embodiment, it is possible to perform channel control that is flexibly adapted to changes in transmission characteristics of the wireless transmission path.

In each of the above-described embodiments, the present invention is applied to a mobile station that is a terminal of a mobile communication system to which the wideband CDMA scheme is applied.
However, the present invention is not limited to wideband CDMA, and receives received waves arriving from a plurality of radio stations via a plurality of radio transmission paths having transmission delay time differences, and the information given by the received waves is Any wireless terminal device that should perform processing related to any channel control can be applied to a wireless transmission system to which any multiple access method or modulation method is applied.

In each of the above-described embodiments, transmission power control that is effective in solving the perspective problem inherent in the CDMA scheme is performed.
However, the present invention can be similarly applied to a wireless transmission system in which such transmission power control is not performed.
Further, in each of the above-described embodiments, the calculation procedure applied to the determination of the transmission time point is not disclosed. However, the calculation procedure is not a feature of the present invention, and various known techniques can be applied. Is possible.

  In each of the above-described embodiments, the present invention is applied to a wireless transmission system in which transmission units such as the above-described frames and time slots are transmitted through a wireless transmission path at a predetermined cycle. If it is required that the transmission time point at which the subsequent transmission unit should be transmitted is determined with reference to the time point when the transmission unit that has arrived before is received, a wireless transmission system in which such a period is not constant Also, the present invention is applicable.

Further, in each of the above-described embodiments, the applied channel control method and procedure are not specifically shown. However, the present invention is not limited to the operating status of the system, such as traffic distribution, and the radio terminal apparatus according to the present invention. Depending on the radio zone to be accessed, the radio channel and other factors, even if the aforementioned monitoring time t _W or the transmission time differs, these factors are identified in the channel control process and the monitoring time t _{As long as W and} other values are given reliably, the present invention can be applied to a radio transmission system to which any channel control method or procedure is applied.

11 Receiving means 12 Channel control means 13 Transmitting means 21, 31 Demodulating means 61, 73 Mobile station (MS)
62, 92 CDMA control unit 62A, 62B Monitoring time correction table 63, 91 Reception timing detection unit 64 Reception signal processing unit 71 Wireless base station (BTS)
72 Radio Zone 81 Antenna 82 Antenna Interface Unit 83 Transmission Information Generating Unit 84 Spreading Unit 85 Orthogonal Modulating Unit 86 Transmitting Unit 87 Receiving Unit 88 Orthogonal Demodulating Unit 89 Despreading Unit 90 Demodulating Unit

Claims (2)

In a mobile communication system having a plurality of base stations and wireless terminal devices, and capable of receiving signals from the plurality of base stations at the time of handover,
Each of the plurality of base stations has transmission means for transmitting a downlink signal to the wireless terminal device,
The wireless terminal device is
A receiving means for receiving in parallel a first downlink signal and other downlink signals that have a time deviation that arrives via a wireless transmission path, and received within a predetermined time after receiving the first downlink signal A mobile communication system comprising: processing means for processing another downlink signal as a target of reception processing and generating a transmission power control signal in accordance with a reception state of the downlink signal as a processing target. In a radio terminal apparatus in a mobile communication system having a plurality of base stations and capable of receiving signals from the plurality of base stations at the time of handover,
A receiving means for receiving in parallel a first downlink signal and other downlink signals that have a time deviation that arrives via a wireless transmission path, and received within a predetermined time after receiving the first downlink signal Processing means for processing other downlink signals as reception processing targets, and generating a transmission power control signal according to the reception state of the downlink signals set as processing targets;
A wireless terminal device comprising:

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