CN101379746A - Radio communication system, radio transmission device, and RACH transmission method - Google Patents

Abstract

Disclosed are a radio communication system, a radio transmission device, a RACH transmission method capable of reducing the important information conflict probability and improve the communication system throughput in a channel transmitted at a random timing such as RACH. In a frame configuration used by the communication system, the number of slots of RACH is reduced by one and the resource for the slot is equally allocated as a resource for a pilot/UE-ID of other slot. This increases the resource amount of the pilot/UE-ID. Furthermore, the resource of the pilot/UE-ID is divided into a plurality of sub slots, which are allocated as resource blocks for respective mobile stations.

Description

Wireless communication system, wireless base station apparatus and rach transmission method

Technical field

RACH) the present invention relates to (Random Access Channel: the wireless base station apparatus of transmission such as and the wireless communication system that constitutes by this wireless base station apparatus with RACH.

Background technology

At present, in 3GPP RAN LTE (third generation partner program local area network (LAN) Long Term Evolution), the sending method of RACH is studied.RACH is at the channel as the travelling carriage of communication terminal employed uplink when holding state is transferred to the exhalation step.Use this RACH, communication terminal identifying information (UE-ID), pilot tone, with road request (Association request), resource request (ResourceRequest) and transmitted power etc., be transferred to the base station for setting up the required information of scheduling channel (Scheduled Channel).

Because RACH is based on the channel (Contention based Channel) of competition, can not dispatch by the base station, send resource (sending timing, frequency and code etc.) so dominate down selection randomly at travelling carriage.The conflict that RACH takes place if frequency band etc. send that Resource Block repeats between a plurality of users, base station then can't correctly receive with demodulation they, travelling carriage is retransmitted RACH to the base station as a result.

For example, if be useful in (the Wideband CodeDivision Multiple Access: branch crack Slotted ALOHA (SlottedALOHA) Wideband Code Division Multiple Access (WCDMA)) of disclosed W-CDMA in the non-patent literature 1, then as shown in Figure 1, travelling carriage is selected one randomly from the Resource Block (time slot A is to E) of regulation, and sends RACH.

[non-patent literature 1]: " 6.Random access procedure ", 3GPP, TS25.214V6.6.0 (2005-06)

Summary of the invention

The problem that invention will solve

But, in non-patent literature 1 disclosed technology,, then all transmission information must be retransmitted by RACH in case clash.Then,, then can increase the probability that conflicts of other RACH that will send with the next one if increase the repeating transmission number of times of RACH, and then the vicious circle that can cause the transmission performance of RACH more to reduce.Its result is by the communication delay increase of RACH information transmitted.

The object of the present invention is to provide wireless communication system, wireless base station apparatus and radio communication method, can prevent the repeating transmission of RACH, thereby improve the throughput of communication system.

The scheme of dealing with problems

The structure that wireless communication system of the present invention adopted is, constitute from a plurality of wireless base station apparatus respectively with the Resource Block of the channel of at random timed sending by first Resource Block and second Resource Block, described first Resource Block is assigned to the conflicting data that should avoid between described a plurality of wireless base station apparatus, and described second Resource Block is assigned to the data except described data of answering approach avoidance conflict, described wireless communication system comprises: first allocation units, give described first Resource Block with the described data allocations of approach avoidance conflict of answering; And second allocation units, will give described second Resource Block except the data allocations the described data of answering approach avoidance conflict.

The invention effect

According to the present invention, in the channel that RACH etc. sends with at random timing, can prevent the conflict probability of important information, thereby improve the throughput of communication system.

Description of drawings

Fig. 1 is the figure of expression non-patent literature 1 disclosed frame structure;

Fig. 2 is the block diagram of primary structure of the wireless base station apparatus of expression embodiments of the present invention 1;

Fig. 3 is the figure that is illustrated in employed frame structure in the wireless communication system of execution mode 1;

Fig. 4 is the figure of expression non-patent literature 1 disclosed frame structure;

Fig. 5 is that Localized-FDMA (Localized-Frequency DivisionMultiplexing Access: the figure of the frame structure of the RACH in the time of local formula frequency division multiple access) has been used in expression;

Fig. 6 is the figure that is used to illustrate the effect of execution mode 1;

Fig. 7 is the figure of variation (variation) of frame structure of the RACH of expression execution mode 1;

Fig. 8 is the figure of variation of frame structure of the RACH of expression execution mode 1;

Fig. 9 is the figure of variation of the frame structure of expression execution mode 1;

Figure 10 is the block diagram of primary structure of the wireless base station apparatus of expression embodiments of the present invention 2;

Figure 11 is the figure that is used to illustrate the effect of execution mode 2;

Figure 12 is the block diagram of primary structure of the wireless base station apparatus of expression embodiments of the present invention 3;

Figure 13 is the figure of the example of a plurality of sending time slots types of expression (slot type);

Figure 14 is the figure that is illustrated in an employed routine tables of data when selecting the sending time slots type based on the UE access number;

Figure 15 is the figure (channeling) of multiplexing method of the sending time slots of a plurality of types of expression;

Figure 16 is the figure (time-multiplexed) of multiplexing method of the sending time slots of a plurality of types of expression;

Figure 17 is the figure that is used for illustrating the benefit that increases transmission rate; And

Figure 18 is the figure of an employed routine tables of data when selecting the sending time slots type based on the RACH number of retransmissions.

Embodiment

Below, explain embodiments of the present invention with reference to accompanying drawing.In addition, Node B (Node B) is the base station, and UE (User Equipment: subscriber equipment) be travelling carriage.In addition, in each execution mode, with following content as precondition.

(1) RACH transmission travelling carriage identifying information (UE-ID), pilot tone and other transmission information.

(2) UE-ID is the information that travelling carriage can be discerned in the base station.

(3) pilot tone is to send known data between the reception, and it is used for receiving regularly detection and channel estimating etc.

(4) other transmission information is meant with the road request, the information of resource request and transmitted power etc.

(5) wireless base station apparatus of the present invention is installed on the travelling carriage, carries out from the transmission of travelling carriage to the uplink of base station.

(execution mode 1)

Fig. 2 is the block diagram of primary structure of the wireless base station apparatus (travelling carriage) of expression embodiments of the present invention 1.

The wireless base station apparatus of present embodiment possesses: coding unit 101-1 and 101-2, modulating unit 102-1 and 102-2, DFT (Discrete Fourier Transform: discrete Fourier transform (DFT)) unit 103-1 and 103-2, map unit 104-1 and 104-2, IFFT (Inverse Fast Fourier Transform: invert fast fourier transformation) unit 105-1 and 105-2, CP (Cyclic Prefix: cyclic redundancy) extra cell 106-1 and 106-2, sending time slots selected cell 107, send sub-slots selected cell 108, TDM (TimeDivision Multiplexing: time-multiplexed) unit 109, radio-cell 110 and antenna 111.

In addition, the wireless base station apparatus of present embodiment possesses, system that the UE-ID/ pilot tone in sending data is handled and the system that other transmission information is handled.Therefore, because each system is made of a plurality of structures with identical function, to they additional identical labels, and after each label, add different branch number (system that the UE-ID/ pilot tone is handled is " 1 ", and the system that other transmission information is handled is " 2 ") so that difference mutually.

Each unit of the wireless base station apparatus of present embodiment carries out following action.

Coding unit 101-1 and 101-2 carry out the EDC error detection and correction encoding process to sending data.Modulating unit 102-1 and 102-2 modulate with modulation systems such as PSK modulation and QAM modulation the data from coding unit 101-1 and 101-2 output.Transmission signal after DFT unit 103-1 and 103-2 will modulate is transformed to frequency component from time waveform.

Sending time slots selected cell 107 is selected the time slot (=frequency band) that sent randomly, it is outputed to send sub-slots selected cell 108, and output to map unit 104-2.

Send sub-slots selected cell 108 from sending time slots selected cell 107 selected time slots, selecting a sub-slots randomly, it is outputed to map unit 104-1.

Map unit 104-1 and 104-2 according to from the timeslot number of sending time slots selected cell 107 output and from the sub-slots that sends 108 outputs of sub-slots selected cell number, will be transformed to the data map of frequency component on the frequency resource of radio frames.

The data conversion that IFFT unit 105-1 and 105-2 will be mapped on the frequency domain is a time waveform.CP extra cell 106-1 and 106-2 generate CP (CyclicPrefix: cyclic redundancy), and the CP that is generated is appended to the beginning of data division by a part of duplicating regulation from the rear end of the output signal of IFFT unit 105-1 and 105-2.109 pairs of significant data and the non-significant datas from CP extra cell 106-1 and 106-2 output in TDM unit carry out time-multiplexed (TDM:TimeDivisionMultiplexing).The signal of 110 pairs of 109 outputs from the TDM unit of radio-cell carries out the wireless transmission of regulations such as D/A conversion and up-conversion to be handled, and sends by antenna 111.

Fig. 3 is the figure that is illustrated in employed frame structure in the wireless communication system of present embodiment.In addition, for the feature of the frame structure that makes present embodiment is clear and definite, represent non-patent literature 1 disclosed frame structure at Fig. 4.

In the present embodiment, as shown in Figure 3, the RACH time slot is four of A to D.On the other hand, in non-patent literature 1, as shown in Figure 4, the RACH time slot is five of A to E.This is because in the present embodiment, with one (for example, in the example of Fig. 4, the leaving out time slot E) of timeslot number minimizing of RACH, and will distribute to other time slot (being that time slot A is to D) equably in the example of Fig. 4 corresponding to the resource of this time slot.

In addition, in the present embodiment, as shown in Figure 3, each RACH has the pilot tone/UE-ID part that is used to shine upon pilot tone and UE-ID, and other parts are assigned to the part of other transmission information of mapping.That is to say that Resource Block is divided into pilot tone/UE-ID part and other transmission information.On the other hand, in non-patent literature 1, Resource Block is not divided into pilot tone/UE-ID part and other transmission information (though in the bottom of Fig. 4, the Resource Block of pilot tone/UE-ID part and the figure of the Resource Block of other transmission information have been represented to be divided into for convenience's sake, so that carry out the comparison of stock number in the following description, but, in fact be not to be divided into two like this).

In addition, in the present embodiment, as shown in Figure 3, the Resource Block of pilot tone/UE-ID part also is divided into a plurality of sub-slots.

The reason that these differences occur is that the wireless communication system of present embodiment has been stipulated frame structure based on following idea.That is to say, in the present embodiment, the timeslot number of RACH is reduced one, and will distribute to other time slot equably corresponding to the resource of this time slot.Then, the resource of using the resource be newly assigned to each time slot to use as pilot tone/UE-ID.So, be assigned to the resource that pilot tone/UE-ID uses owing to also exist, so if they are combined, then the stock number (being equivalent to area among the figure) of pilot tone/UE-ID part increases.Therefore, in the present embodiment, further the division of resources with this pilot tone/UE-ID part is a plurality of sub-slots that generate sectionalization, and distributes the Resource Block that they use as each travelling carriage.

In the present embodiment, can increase the stock number that is assigned to UE-ID and pilot tone by adopting above-mentioned frame structure, with respect to this, the stock number of other transmission information can reduce.Therefore, the conflict probability of UE-ID and pilot tone reduces, and is relative therewith, and the conflict probability of other transmission information increases.This means the reception that the reception of information such as UE-ID is had precedence over other transmission information.

On the other hand, in non-patent literature 1,, all distributed the stock number of same ratio for pilot tone, UE-ID, with all RACH transmission information such as road request, resource request and power information.Therefore, the RACH transmission information that sends from a plurality of travelling carriages, the conflict probability of pilot tone/UE-ID is identical with the conflict probability of other transmission information.

In addition, in the present embodiment, if only observe a time slot (for example, only being conceived to time slot A), (areas of the other parts of Fig. 4 bottom) are identical when then distributing to other stock number (areas of the other parts of Fig. 3 bottom (otherpart)) of transmitting information with non-patent literature 1.That is to say that this is because existing with road request, resource request and power information etc. is the required MIN stock number of transmission, and this stock number is guaranteed.

Then, below how explanation wireless base station apparatus in the wireless communication system of the present embodiment that adopts above-mentioned frame structure moves, particularly, illustrate how sending time slots selected cell 107, transmission sub-slots selected cell 108 and map unit 104-1 and 104-2 move.

At first, the sending time slots selected cell 107 in the wireless base station apparatus of present embodiment is selected a time slot randomly from a plurality of RACH time slot A to D, and map unit 104-2 is indicated.Here, selected the example of time slot A representing from time slot A to D.

Then, send sub-slots selected cell 108, select a sub-slots randomly in a plurality of sub-slots from be arranged on sending time slots selected cell 107 selected time slot A, and map unit 104-1 is indicated.In the example of Fig. 3, in time slot A, there are a plurality of time slots 1 to 4 (, always having 16) respectively, from these four sub-slots and then select a sub-slots (selecting four Resource Block) as Resource Block as Resource Block.

Map unit 104-1 will be mapped on the time slot of being indicated by sending time slots selected cell 107 from the pilot tone/UE-ID of DFT unit 103-1 output.On the other hand, map unit 104-2 will be from other transmission information mapping of DFT unit 103-2 output on by the sub-slots that sends 108 indications of sub-slots selected cell.

In addition, for the dividing method on frequency domain of Resource Block, use Distributed-FDMA shown in Figure 3 (Distributed-Frequency Division Multiple Access: distributed frequency division multiple access) more effective.This be because, (Localized-Frequency Division Multiple Access: the frame structure of the RACH in the time of local formula frequency division multiple access) is compared with as shown in Figure 5 use Localized-FDMA, use the frame structure of Fig. 3 then can access frequency diversity gain, and, other transmission information is separated in the channel estimating of timing so resulting pilot tone can be used in because frequency band is identical with the frequency band of other transmission information.

Fig. 6 is the figure that is used for illustrating the effect of present embodiment.As shown in the drawing, from the communication system of present embodiment on the whole,, can not clash so be assigned on the time slot of mutually different frequency band because pilot tone/UE-ID part of the RACH that sends from a plurality of UE is by frequency division.Therefore, even other transmission information of the RACH that sends from a plurality of UE clashes identical time slot A, can not receive and this information of demodulation, demodulation at least also can be carried out to UE-ID and pilot tone in the base station.Here it is partly has precedence over the reason that other transmits information with pilot tone/UE-ID.

As mentioned above, according to present embodiment, in RACH sends, set the transmission Resource Block (time slot) of distributing to UE-ID and pilot tone greater than the transmission Resource Block of distributing to road request, resource request and transmitted power etc.That is to say that according to present embodiment, the ratio of the transmission Resource Block of the control information that UE-ID etc. is important is set greater than the ratio of the transmission Resource Block of other transmission information.Here, RACH is for the scheduling that is not subjected to a plurality of travelling carriages or send timing controlled, and the channel that is sent out with at random timing.In addition, for control informations such as UE-ID and pilot tone, can't the configuration scheduling channel and must retransmit RACH owing to clash, in this sense, they also are the data of particular importance in the information that sends by RACH, and are the data of answering approach avoidance conflict.As long as control informations such as UE-ID and pilot tone do not conflict, even conflict has taken place in other control information, this other control information also can send by ensuring escapement from confliction by the setting of scheduling channel.That is to say,, the repeating transmission of RACH can not take place then as long as control informations such as UE-ID and pilot tone do not conflict.

Therefore, present embodiment reduces by the conflict probability between the important control information such as the UE-ID of RACH transmission and pilot tone, can prevent the repeating transmission of RACH thus, thereby improve the throughput of communication system.

In addition, become big, so it is further carried out frequency division and distributes Resource Block (sub-slots) by each UE owing in above structure, distribute to the ratio of the transmission Resource Block of UE-ID and pilot tone.That is to say, generate sub-slots by the FDMA mode.

Therefore, for UE-ID and pilot tone, can not produce and disturb with transmission signal from other UE, for example, even because of conflict can not receive other transmission information, at least also can obtain UE-ID (be used to discern which UE and carried out the information that sends) and pilot tone (being used to judge the signal that receives timing).In addition, thus, other can be transmitted information distribution and retransmit, thereby can reduce the repeating transmission number of times of RACH to scheduling channel rather than RACH.In addition, can prevent that other communication delay that transmits information is excessive.

In addition, though in the present embodiment, dividing method as the Resource Block that distributes significant data, code division multiple access), the TDMA cut apart in the time shaft field (Time Division Multiple Access: time division multiple access) and SDMA (the Space Division Multiple Access of cutting apart at space field: space division multiple access) etc. so that be used in the structure of the FDMA that frequency domain cuts apart is that example is illustrated, but can be useful in the CDMA cut apart in the code field (Code Division Multiple Access: in addition.That is to say,, can utilize time, frequency and code etc. as sending Resource Block.

For example, in the TDMA that the time shaft field is cut apart, the frame structure of RACH as shown in Figure 7.As shown in the drawing, pilot tone/UE-ID partly is carried out the time and cuts apart and form time slot 1 to 4.

In addition,, be not limited to this, also can be divided into more than two sending Resource Block though be that example is illustrated will send the situation that Resource Block is divided into two in the present embodiment.For example, the frame structure of RACH as shown in Figure 8 is such, also can be (for example by first significant data, UE-ID and pilot tone), second significant data (for example, with road request (association request) and resource request) and non-significant data (for example, power information etc.) distinguish and send Resource Block.

In addition, for the resource allocation between the Resource Block of the Resource Block of UE-ID and pilot tone and other transmission information, the resource allocation between significant data and non-significant data just, also can adopt with the base station is unit, i.e. the structure that each base station is changed.For example, frame structure shown in Figure 9 is used in set base station in the higher zone of the conflict probability of RACH such as urban district.As this example,, can further reduce the conflict probability of UE-ID and pilot tone by the resource allocation of UE-ID and pilot tone being set more than other resource allocation of transmitting information.At this moment, for resource allocation than and frame format information, for example the base station is used and to be reported channel (BCH:Broadcast Channel) and wait and the interior travelling carriage in zone is carried out signaling (signaling) get final product.

In addition, though represented the example as important information in the present embodiment, can be the judgement that benchmark carries out importance degree for example also with the importance degree in the setting of scheduling channel with pilot tone/UE-ID.For example, in this judgment standard, importance degree is that big information is meant and is the required information of configuration scheduling channel, the information of importance degree in being is meant resource requirement piece and the required information of best MCS parameter (encoding rate and modulation system) into the decision scheduling channel, and importance degree to be little information be meant to making the required information of transmitted power optimization of scheduling channel.Particularly, the information of importance degree in being for example is with road request and resource request etc., even when radio receiver (base station) can't receive with this information of demodulation, radio receiver replaces using certain fixing Resource Block and fixing MCS etc. to get final product.In addition, importance degree is that little information for example is the power information of travelling carriage, even when radio receiver can't receive with this information of demodulation, radio receiver sends scheduling channel with maximum power and gets final product.

(execution mode 2)

Figure 10 is the block diagram of primary structure of the wireless base station apparatus of expression embodiments of the present invention 2.In addition, this wireless base station apparatus have with in the identical basic structure of wireless base station apparatus (referring to Fig. 2) shown in the execution mode 1, to the additional identical label of identical structural element, and omit its explanation.Single carrier formula frequency division multiplexing) and OFDM modes such as (OFDMs) in addition, here to have adopted SC-FDMA (Single Carrier-FDMA:, just adopted the situation of the transmission means of using CP to describe as example.

The wireless base station apparatus of present embodiment has long CP extra cell 201, and in RACH sends, the CP length setting that appends to UE-ID and pilot tone must be longer than the CP length that appends to other transmission information (with road request, resource request and transmitted power etc.).

Particularly, 201 couples of UE-ID of long CP extra cell and pilot tone are added CP, and described CP has the signal length that determines based on the maximum time in contemplated propagation delay time (obtaining by emulation etc.).The signal length of the CP that is added as this long CP extra cell 201 is used the length of being longer than the signal length of the additional CP of other transmission information.Narration is identical in other structure and the execution mode 1.

Figure 11 is the figure that is used for illustrating the effect of present embodiment.As shown in the drawing, by using long CP,, also can prevent between the signal that signal that UE1 uses and UE2 use, to disturb (MAI (Multiple Access Interference): the multiple access interference) even propagation delay increases.

As mentioned above, according to present embodiment, by using long CP, even receiving under the situation of timing error increase greatly because of propagation delay, also can reduce the possibility of take place disturbing, thereby can prevent that significant data from being the deterioration of the quality of reception of UE-ID and the reduction that receives the timing detection performance.Its result can reduce the repeating transmission number of times of RACH.In addition, can prevent that other communication delay that transmits information is excessive.

In addition, also can consider other transmission information is also used long CP in case other transmits the structure of the quality of reception deterioration of information, still, in this case, the expense of CP (overhead) increases.

In addition, though, also can adopt the structure of UE-ID and pilot tone being carried out repetition (repetition) to replace setting CP longer in time domain in the present embodiment the signal length of CP is set to such an extent that long structure is that example is illustrated.At this moment, also can access effect identical when setting CP longer.

In addition, though in the present embodiment on the basis of the structure of execution mode 1, further using the situation of long CP to be illustrated as example, but be not limited to this, for example, also can adopt the distinctive structure that only has long CP extra cell 201 and execution mode 1 is not set is sending time slots selected cell 107 and the structure that sends sub-slots selected cell 108.

(execution mode 3)

Figure 12 is the block diagram of primary structure of the wireless base station apparatus of expression embodiments of the present invention 3.In addition, this wireless base station apparatus also have with in the identical basic structure of wireless base station apparatus (referring to Fig. 2) shown in the execution mode 1, to the additional identical label of identical structural element, and omit its explanation.In addition, in description of the present embodiment, for the ease of understanding the title of using travelling carriage/base station to come instead of wireless dispensing device/radio receiver.

The travelling carriage of present embodiment also has sending time slots type setup unit 301.

In sending time slots type setup unit 301, store multiple sending time slots type in advance.Figure 13 is the figure of the example of these a plurality of sending time slots types of expression.In each sending time slots type, the transmission of significant data is different with the ratio of resource with the transmission of resource and non-significant data.

More specifically, in Figure 13, be illustrated in the time slot type on right side, the Resource Block that is assigned with significant data shared ratio in all is more little, and by using such time slot type, the conflict probability between travelling carriage can increase.In addition, be conceived to non-significant data, be illustrated in the time slot type on right side, the ratio of the Resource Block of non-significant data is big more, and the message transmission rate of non-significant data improves.On the other hand, be illustrated in the time slot type in left side, the ratio of the Resource Block of significant data is big more, and by using such time slot type, the conflict probability between the travelling carriage reduces.

Sending time slots type setup unit 301 is according to the signaling (notice) from the time slot type control information of base station, from a plurality of sending time slots types, and an employed sending time slots type when being chosen in the RACH transmission.

The sending time slots type is controlled based on the size of UE access number in the base station, by notification channel, carries out the signaling of time slot type control information to travelling carriage.The UE access number is the overlay area that is positioned at communication system for example, and registers the number of the travelling carriage that the position is arranged in the base station.Figure 14 is the figure of expression one example of employed tables of data when selecting the sending time slots type based on UE access number (M).Like this, along with the increase of UE access number, transfer to the high time slot Class1 of ratio of significant data.The base station is shown based on this, selects corresponding sending time slots type according to the UE access number, and selection result is notified to travelling carriage.

Sending time slots type setup unit 301 outputs to sending time slots selected cell 107 with selected sending time slots type.

107 selections of sending time slots selected cell and the corresponding sending time slots of exporting from sending time slots type setup unit 301 of time slot type, and output to transmission sub-slots selected cell 108 and map unit 104-2.

Multiplexing method as the sending time slots of a plurality of types for example both can use channeling shown in Figure 15, also can use shown in Figure 16 time-multiplexed.In the example of Figure 15, in the sending time slots of the RACH of the scheduling channel that continues, frequency band is split into four, and is suitable for time slot Class1 to 4 respectively.On the other hand, in the example of Figure 16, sending time slots T1 and the T2 of the RACH of the scheduling channel that continues are split into four time slots (time slot 1 to 4) respectively.And, in sending time slots T1, be suitable for time slot type 2, and in sending time slots T2, be suitable for time slot type 3.Like this, under time-multiplexed situation, to carry out the switching of time slot type in the long scope (range).This structure in time domain switching time slot type is suitable for the travelling carriage that as above such signaling of passing through the base station is switched the time slot type.

As mentioned above, according to present embodiment, the base station is based on UE access number control time slot type.That is to say, when the UE access number more and predict the conflict probability when higher, from a plurality of time slot types, select to distribute to significant datas such as pilot tone and UE-ID resource large percentage the time slot type (for example, and be notified to travelling carriage time slot Class1 or 2 among Figure 13).Thereby can reduce the conflict probability of the RACH between travelling carriage.In addition, in contrast, when the UE access number less and predict the conflict probability when low, selection distribute to non-significant data (other transmission information) resource large percentage the time slot type (for example, time slot type 3 or 4 among Figure 13), and be notified to travelling carriage, thereby can improve the transmission rate of communication system.

Transmission rate has following benefit when increasing.That is to say, if improved transmission rate, as shown in figure 17, because the setting data transmission is scheduling channel (setting best transmitted power, modulation system, encoding rate and transmission frequency band) with channel expeditiously, so be shortened from the exchange of the control information of transmission till sending actual data of beginning RACH, thereby can reduce time of delay till sending actual data.Compare with the time of delay of Figure 17 A, reduced the time of delay of Figure 17 B.

In addition, though in the present embodiment with the signaling of sending time slots type setup unit 301 bases from the time slot type control information of base station, the structure of the time slot type when selecting RACH to send is that example is illustrated, but also can adopt at the fixing frequency band that is predetermined the structure of the repeating transmission selection of times time slot type of the RACH that sending time slots type setup unit 301 is detected based on own stand (travelling carriage).

As mentioned above, by switching the time slot type at the fixing frequency band that is predetermined, when the repeating transmission number of times of RACH more for a long time, mobile device (for example uses the more time slot type of the resource of significant datas such as pilot tone and UE-ID, time slot Class1 or 2 among Figure 13), thus can reduce the conflict probability.Figure 18 is the figure of expression employed routine tables of data when selecting the time slot type based on this RACH number of retransmissions (N).

In addition, select the time slot type by travelling carriage according to the RACH number of retransmissions, the repeating transmission number of times of RACH can reduce, thereby can prevent the excessive increase of the communication delay of other transmission information.At this moment, the structure that disposes different time slot types on frequency domain as shown in figure 15 is proper.

In addition, though in the present embodiment, for example when channeling, represented time slot Class1 to 4 not to be applicable to the structure of identical frequency band, when time-multiplexed, represented not with the multiplexing structure of time slot Class1 to 4 in identical timing, but, if in radio receiver, can detect and discern each time slot type, also can adopt the multiplexing structure of different time slot types in identical frequency band (channeling) or identical timing (time-multiplexed).

Each execution mode of the present invention more than has been described.

In addition, wireless base station apparatus of the present invention and radio communication method are not limited to above-mentioned each execution mode, implement and can carry out various changes.

Wireless base station apparatus of the present invention can be installed in communication terminal and the base station apparatus in the mobile communication system, and communication terminal, base station apparatus and mobile communication system with action effect identical with above-mentioned record can be provided thus.

In addition,, comprise also that in UE-ID preamble (preamble) is the data sequence repeatedly of condition code (signature) (spread spectrum code sequence) here.In addition, when UE-ID is preamble, owing to can use preamble as known bits, so wireless base station apparatus of the present invention might not need to send pilot tone.

In addition, though be illustrated as example with the situation of using discrete Fourier transform (DFT) (DFT), when input data number is 2 power time, also can use fast Fourier transform (FFT) at this.

In addition, though be illustrated as example with the situation of using invert fast fourier transformation (IFFT), also can replace using inverse discrete Fourier transformer inverse-discrete (IDFT) at this.

In addition,, be not limited thereto, also can adopt IFDMA (Interleaved Frequency Division MultipleAccess: the structure formula that interweaves frequency division multiple access) though be that example is illustrated with situation of adopting the DFT-s-OFDM structure at this.

In addition, in 3GPPRANLTE, significant datas such as UE-ID and pilot tone are called as " preamble (Preamble) " sometimes, and non-significant datas such as other control information are called as " message (Message) " sometimes.

UE-ID is the information that the travelling carriage that has sent RACH can be distinguished in the base station, comprises following information.

1. the distinctive ID in all sub-districts (the distinctive ID of communication terminal).For example, the ID that is used for location registers.

2. distinctive ID in the sub-district.

3., then can be pilot tone or condition code (Signature) if can pass through code pattern (code pattern) difference travelling carriage.Here, condition code is to send known code pattern group between the reception, be meant the information that can specify travelling carriage according to code pattern uniquely.

When pilot tone be UE-ID when (comprising condition code), can be included in the distinctive ID in all sub-districts in the non-significant data rather than in the significant data.

In addition, though be that example is illustrated to constitute situation of the present invention with hardware here, the present invention also can realize with software.For example, the algorithm use programming language of radio communication method involved in the present invention is recorded and narrated, this procedure stores is carried out in memory and by information process unit, can realize the function same thus with wireless base station apparatus involved in the present invention.

In addition, employed each functional block typically realizes by the LSI (large scale integrated circuit) of integrated circuit in the explanation of above-mentioned each execution mode.These functional blocks both can be carried out single chip individually, also can comprise wherein a part of or whole and the implementation single chip.

In addition, though be called LSI,, be also referred to as IC, system LSI, super LSI (Super LSI) or super large LSI (Ultra LSI) etc. sometimes according to the difference of integrated level at this.

In addition, the method for integrated circuit is not only limited to LSI, can use special circuit or general processor to realize yet.Also can utilize and can make the FPGA (Field ProgrammableGate Array) of back programming at LSI, or the reconfigurable processor of the connection of the circuit unit of reconfigurable LSI inside or setting (Reconfigurable Processor).

Moreover, if by the other technologies of the progress or the derivation of semiconductor technology, the technology of the integrated circuit of LSI appears replacing, can certainly utilize this technology to realize the integrated of functional block.The possibility that suitable biotechnology etc. is also arranged.

The Japanese patent application laid of submitting on January 31st, 2006 is willing to 2006-023607 and is all quoted in this application in the disclosed content of specification, accompanying drawing and specification digest that the Japanese patent application laid of submission on March 24th, 2006 is willing among the 2006-083380 to be comprised.

Industrial applicibility

Wireless base station apparatus of the present invention and radio communication method can be applicable to leading in the GSM The purposes such as letter terminal installation and base station apparatus.

Claims (14)

1, a kind of wireless communication system, constitute from a plurality of wireless base station apparatus respectively with the Resource Block of the channel of at random timed sending by first Resource Block and second Resource Block, described first Resource Block is assigned to the conflicting data that should avoid between described a plurality of wireless base station apparatus, and described second Resource Block is assigned to the data except described data of answering approach avoidance conflict, and described wireless communication system comprises:

First allocation units are given described first Resource Block with the described data allocations of approach avoidance conflict of answering; And

Second allocation units will be given described second Resource Block except the data allocations the described data of answering approach avoidance conflict.

2, wireless communication system as claimed in claim 1, wherein,

The ratio of described first Resource Block in all Resource Block of described channel is set greater than the ratio of described second Resource Block, and the quantity of distributing to the wireless base station apparatus of described first Resource Block is set greater than the quantity of the wireless base station apparatus of distributing to described second Resource Block.

3, wireless communication system as claimed in claim 1, wherein,

Also comprise: change the unit, the ratio of described first Resource Block of adaptively modifying in all Resource Block of described channel.

4, wireless communication system as claimed in claim 3, wherein,

Described change unit is according to the visit situation of described a plurality of wireless base station apparatus, the ratio of described first Resource Block of adaptively modifying.

5, wireless communication system as claimed in claim 1, wherein,

Described first Resource Block further is split into the Resource Block that each wireless base station apparatus is used.

6, wireless communication system as claimed in claim 1, wherein,

Use the identifying information of each wireless base station apparatus and pilot tone as described data of answering approach avoidance conflict.

7, wireless communication system as claimed in claim 1, wherein,

Use RACH (Random Access Channel) as described channel.

8, wireless communication system as claimed in claim 1, wherein,

Use based on the competition channel (Contention based Channel) as described channel.

9, a kind of wireless base station apparatus comprises:

Selected cell, have be used for each wireless base station apparatus and be split into the first a plurality of Resource Block and between a plurality of wireless base station apparatus the RACH of the second public Resource Block, from described a plurality of first Resource Block, select one first Resource Block;

First allocation units should be avoided conflicting data between a plurality of wireless base station apparatus to described one first resource block assignments;

Second allocation units are to the data of described second resource block assignments except described data of answering approach avoidance conflict; And

Transmitting element will distribute described first Resource Block and described second Resource Block of data to send.

10, wireless base station apparatus as claimed in claim 9, wherein,

The ratio of described first Resource Block is set greater than the ratio of described second Resource Block.

11, wireless base station apparatus as claimed in claim 9, wherein,

Also comprise: first extra cell, to the additional CP (Cyclic Prefix) of described first Resource Block; And

Second extra cell, to additional the 2nd CP of described second Resource Block,

Described first extra cell is set the signal length of a described CP to such an extent that be longer than the signal length of described the 2nd CP.

12, a kind of communication terminal comprises the described wireless base station apparatus of claim 9.

13, a kind of base station apparatus comprises the described wireless base station apparatus of claim 9.

14, a kind of RACH sending method, wherein,

The Resource Block of RACH is divided into first Resource Block and second Resource Block, described first Resource Block is assigned to the conflicting data that should avoid between a plurality of wireless base station apparatus, and described second Resource Block is assigned to the data except this answers the data of approach avoidance conflict

Set greater than the ratio of described second Resource Block in the ratio in all described first Resource Block, and, set the quantity of distributing to the wireless base station apparatus of described first Resource Block greater than the quantity of the wireless base station apparatus of distributing to described second Resource Block.

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