WO2006030491A1

WO2006030491A1 - Base station device, and signaling method and channel selecting method of communication system

Info

Publication number: WO2006030491A1
Application number: PCT/JP2004/013369
Authority: WO
Inventors: Noriyuki Fukui; Hideji Wakabayashi
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2004-09-14
Filing date: 2004-09-14
Publication date: 2006-03-23

Abstract

Signaling means (method) in a communication system, by which both UP/DOWN and ACK/NACK of a transmission rate are efficiently informed at a predetermined bit number prepared for the signaling of those data. A base station device comprises a command generating unit for receiving send data sent from a terminal device, to generate a resend-controlling reply command (ACK/NACK) indicating a reply success/failure, and a modulation unit for generating a modulation signal to be replied to the terminal device, on the basis of the signal generated by the command generating unit. This command generating unit generates a command, in which a data transmission rate indicating command (UP/DOWN/KEEP) indicating the rise/drop/keep of the transmission rate to be allowed for the terminal device is superposed on the resend-controlling reply command.

Description

Specification

Signaling method and channel selection method for base station apparatus and communication system

Technical field

TECHNICAL FIELD [0001] The present invention relates to a signaling method in a communication system, and in particular, has a function of instructing an increase (up) and a decrease (down) in data transmission speed and correctly receives transmission data. The present invention relates to a signaling method and a channel selection method that are applied to a base station apparatus having a function of notifying a communication partner of power / power failure and a communication system including the base station apparatus.

Background art

[0002] A communication method according to the prior art will be described below. Currently, the international standardization work called 3GPP (3rd Generation Partnership Project) is being promoted as an international standard for distributing and playing back multimedia over high-speed wireless networks.

[0003] For example, it is called "FDD (Frequency Division D UPlex) Enhanced Uplink" for the purpose of increasing the average transmission rate in the uplink (terminal → base station) and expanding the service coverage area (coverage) of the base station Standardization of technology is under consideration. This technology is described in “Node B Controlled Rate Scheduling (Section 7. 1. 1. 3, Section 7. 1. 1. 5)” of “3GPP TR25. 896 V6. This technology is described below.

[0004] The technology referred to as “Node B Controlled Rate Scheduling” is a base station that raises and lowers the “UE (User Equipment) pointerj indicating the maximum data transmission rate that can be used by the terminal. A table called “Transport Format Combination” is prepared, and the terminal can transmit up to the transmission rate set by this “UE pointer”.

[0005] On the other hand, when a higher transmission rate is requested on the terminal side, the terminal performs signaling (request) to the base station (refer to “7. 1.1.5 RR”). . The base station In order to allow the request and indicate UP (see “7. 1. 1. 5 section RG”), do not allow it, or instruct nothing, or give priority to the transmission of other terminals. Conversely, DOW N is indicated. The UPZDOWN instruction is not limited to when the terminal requests “UE pointer” up. For example, the base station may unidirectionally instruct the terminal to UPZ DOWN by increasing or decreasing the total received signal level from the plurality of other terminals at the target base station.

[0006] Next, a retransmission control technique studied by 3GPP will be described (see “TR25. 896 V6. 0. 0 7. 2. 3”). In 3GPP, retransmission control (ARQ: Automatic Repeat reQuest) at the MAC layer is being studied. This technology is also one of the technologies that realize the “FDD Enha need UPlink”. According to this retransmission control technology (ARQ), the base station returns an ACK signal to the terminal if it can correctly receive the transmission data transmitted from the terminal, and if it cannot be received correctly, Control is performed to return a NACK signal to the terminal. On the other hand, the terminal that receives the NACK performs retransmission control of transmission data.

[0007] Non-Patent Document 1: 3GPP TR25. 896 V6.0.0, Section 7.1.1.3, Section 7.1.1.3, Section 7.2.3 Disclosure of Invention

Problems to be solved by the invention

[0008] By the way, CDMA technology is adopted in 3GPP. Therefore, the transmission data is modulated using the orthogonal code, and the receiving station receives the desired data without being interfered with the transmission data transmitted from other transmitting stations based on the same orthogonal code used by the transmitting station. Can be demodulated. However, there is a limit to the number of orthogonal codes that can be used simultaneously in the same radio section.

[0009] So far, in 3GPP, the data transmission rate UPZDOWN and ACKZNACK signaling methods have been studied independently of each other, and both of these have their own transmission timings as described above. Considering the! /, Characteristics, there is a possibility that 3GPP will allocate a new radio channel for UPZDOWN indication and ACKZNACK return respectively.

[0010] When a new radio channel is allocated, a new code is assigned to this radio channel. This leads to the possibility of being assigned. In this case, a new code is used for a channel equipped with an UPZDOWN instruction for transmission speed or a channel equipped with ACKZNACK, in addition to the code used for the wireless channel already defined in the existing standard. As a result, there is a problem that the number of terminals accommodated in the same radio section is further limited.

[0011] Further, when viewed from the receiving terminal side, it is necessary to simultaneously monitor a new channel in addition to the existing channel.

[0012] If retransmission control in the MAC layer cannot be performed quickly, it is difficult to shorten the data transmission time, and improvement in throughput cannot be expected. On the other hand, the timing at which the terminal sends data is arbitrary, and the return timing of ACKZNACK is determined in synchronization with the timing at which the terminal sends data. Therefore, if retransmission control is aimed at improving throughput, a mechanism that can return ACKZNACK at any time must be maintained.

[0013] The present invention has been made in view of the above, and efficiently notifies both of transmission rate UPZDOWN and ACK ZNACK with a predetermined number of bits prepared for signaling of these data. It is an object of the present invention to provide a base station apparatus and a signaling method that can perform communication.

Means for solving the problem

[0014] In order to solve the above-described problems and achieve the object, the base station apparatus according to the present invention receives a transmission data transmitted from the terminal apparatus and indicates a successful reception Z failure, respectively. In the base station apparatus comprising: a command generation unit that generates (ACKZNACK); and a modulation unit that generates a modulation signal to be returned to the terminal device based on a signal generated by the command generation unit. A command is generated by superimposing a data transmission rate instruction command (UP / DOWN / KEEP) indicating an increase in transmission rate, a decrease in Z, and a maintenance of Z on the terminal device, on the retransmission control reply command. And

[0015] As a matter to solve the above problem, the transmission speed UPZDOWNZKEEP The channel that performs this signaling shall be the same as the channel used to explicitly notify the maximum transmission rate as channel assignment, or one-to-one correspondence with the channel assignment channel.

[0016] Further, the channel for performing ACKZNACK signaling is the same as the channel used for explicitly notifying the maximum transmission rate as channel allocation, or the channel corresponding to the channel allocation channel on a one-to-one basis.

[0017] According to the present invention, the transmission rate UPZDOWN (additional transmission rate "κ「 "is added) and ACKZNACK are mounted on the same channel, and the number of bits prepared for the signaling of these data It provides a mechanism (means and method) for efficiently and simultaneously reporting both UPZDOWNZKEEP and ACKZNACK from the base station to the terminal. The invention's effect

[0018] According to the base station apparatus of the present invention, the data transmission rate instruction command (u

(P / DOWN / KEEP) is generated so that a command can be generated, so that an efficient signal transmission can be realized with a predetermined number of bits prepared for normal signaling.

Brief Description of Drawings

[0019] FIG. 1 is a block diagram showing a functional configuration of a communication system according to the present invention.

[FIG. 2] FIG. 2 is a sequence diagram showing signaling that is relevant to the prior art.

FIG. 3 is a sequence diagram showing signaling according to the present invention.

[FIG. 4] FIG. 4 is a chart showing an example of bit patterns of six types of commands including three types of data transmission rate instruction commands, two types of reply commands for retransmission control, and power.

FIG. 5 is a chart showing an example of bit pattern allocation in which priority is given to reducing the false detection probability of ACKZNACK.

[FIG. 6] FIG. 6 is a chart showing an example of bit pattern allocation prioritizing reducing the false detection probability of transmission speed up Z down Z keep.

[FIG. 7] FIG. 7 is a chart showing the distance between the ACK group and the NACK group in the bit pattern allocation shown in FIG. FIG. 8 is a diagram showing an example of signal arrangement in which the six types of commands (ACK, ACK & DOWN, ACK & UP, NACK, NACK & DOWN, and NACK & UP) shown in FIG. 4 are arranged based only on phase information.

[Fig. 9] Fig. 9 is a diagram showing an example of signal arrangement in which the six types of commands shown in Fig. 8 (ACK, ACK & DOWN, ACK & UP, NACK, NACK & DOWN, NACK & UP) are arranged based on phase information and amplitude information. is there.

[FIG. 10] FIG. 10 is a diagram showing an example of signal arrangement in which priority is given to reducing the false detection probability of transmission speed up Z down Z keep.

[FIG. 11] FIG. 11 shows the six types of commands shown in FIG. 10 (ACK, ACK & DOWN, ACK & UP, NACK, NACK & DOWN, NACK & UP) based on phase information and amplitude information.

It is a figure showing an example of signal arrangement arranged by V.

[FIG. 12] FIG. 12 shows another signal arrangement different from that shown in FIG. 8 to FIG. 11, and is used to explain the technique using 6 signal points of 8-phase PSK. FIG.

FIG. 13 is a diagram showing an example of a signal arrangement representing only four types of commands (ACK & UP, ACK & DOWN, NACK & UP, NACK & DOWN).

FIG. 14 is a diagram showing an example of a sequence for performing transmission rate maintenance signaling for one command category having the four types of commands shown in FIG. 13 as a set.

[FIG. 15] FIG. 15 is a diagram showing how transmission rate UPZDOWNZKEEP signaling is performed on the same channel as the channel used to explicitly notify the maximum transmission rate when allocating channels! is there.

[FIG. 16] FIG. 16 shows transmission rate up Z down Z maintenance signaling performed on a channel corresponding to the channel used to explicitly notify the maximum transmission rate at the time of channel assignment. It is a figure which shows a mode.

FIG. 17 is a chart showing an example of a correspondence relationship between channels that perform channel assignment and channels that perform UPZDOWNZKEEP signaling of a transmission rate.

Explanation of symbols

11 Transmission data storage

12 Data generator 13 Modulator

14 Demodulator

15 Retransmission judgment & rate control section

21 Demodulator

22 Data receiver

23 Command generator

24 Total received signal level status management section

25 Modulator

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a base station apparatus according to the present invention and a signaling method and a channel selection method of a communication system according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

FIG. 1 is a block diagram showing a functional configuration of a communication system according to the present invention, for explaining communication performed between a base station apparatus and a terminal apparatus constituting the mobile communication system. It is shown as an example.

In FIG. 1, on the base station side, a demodulator 21, a data receiver 22, a command generator 23, a total received signal level state manager 24, and a modulator 25 are provided. On the other hand, the terminal side includes a demodulator 14, a retransmission determination & rate controller 15, a transmission data storage 11, a data generator 12, and a modulator 13.

Next, the operation of the communication system shown in FIG. 1 will be described. In the figure, the transmission data storage unit 11 of the terminal holds data to be transmitted! The data generation unit 12 determines data transmission based on the presence / absence of data in the transmission data storage unit 11. The data transmitted from the data generation unit 12 to the modulation unit 13 is modulated by the modulation unit 13 and transmitted to the base station side.

On the other hand, the demodulator 21 of the base station demodulates the transmission signal transmitted from the terminal side and outputs data. The demodulated data is subjected to error correction and error check by the data receiving unit 22, and the result is notified to the command generating unit 23. Total received signal level status management unit 24 monitors the received level of signals transmitted from other terminals, and the monitoring results Is sent to the command generator 23. The command generator 23 determines whether or not it is necessary (or possible) to increase or decrease the transmission speed of the target terminal based on the received signal level, and succeeds in receiving data based on the error check result of the received data. It is determined whether or not to generate an ACKZNACK! Or deviation command indicating failure, respectively, and based on these determination results, the generated command (bit arrangement) is transmitted to the modulation unit 25. The modulation unit 25 modulates the transmitted command using an orthogonal code, and transmits the modulated command to the terminal.

[0026] The demodulation section 14 of the terminal performs demodulation processing using the same code as the orthogonal code used in the base station. The retransmission determination & rate control unit 15 performs ACKZNACK reception determination and transmission rate change instruction determination. When a NACK is received, the retransmission generation & rate control unit 15 instructs the data generation unit 12 to perform retransmission processing and also transmits a transmission rate change instruction. If so, indicate that.

Next, a signaling (transmission procedure) sequence that is relevant to the present invention will be described in comparison with the prior art. Note that FIG. 2 is a sequence diagram showing signaling related to the prior art, and shows an example of a sequence for separately transmitting ACKZNACK and Rate UPZDOWN. On the other hand, FIG. 3 is a sequence diagram showing signaling according to the present invention, in which an ACK / NACK and a data transmission rate (Rate) UPZDOWN are transmitted simultaneously, in other words, ACKZNACK is combined with a data transmission rate UPZDOWN. Here is an example sequence (or vice versa).

[0028] First, a signaling sequence related to the prior art will be described. In FIG. 2, the terminal transmits traffic data to the base station (step S201, step S204), and the base station returns a response command ACKZNACK for receiving the traffic data transmitted from the terminal (step S202, step S204). S205). In addition, the base station transmits a command instructing UPZDOWN of the data transmission rate, which is a command independent of these response commands, to the terminal (step S203). Note that the execution timing of the ACKZNACK command and the command that indicates UPZDOWN of the data transmission rate are different. In other words, the ACKZNACK command is triggered by the reception of traffic data, but the command that indicates UPZDOWN of the data transmission rate is triggered by an increase or decrease in the received signal level from multiple terminals at the base station in response to a request from the terminal. Gaka You can On the other hand, timing of data transmission rate UPZDOWN instruction and ACKZNACK sirend may coincide.

[0029] Next, a signaling sequence useful for the present invention will be described. In FIG. 3, the terminal transmits traffic data to the base station (step S301, step S303), and the base station returns a response command A CK / NACK to the reception result of the traffic data transmitted from the terminal (step S302). , Step S304). However, in step S302, the data transmission speed UPZDOWN command is added to the ACKZNACK command. When the terminal sends traffic data, the base station must always return ACKZ NACK, which is signaling that always occurs. The present invention relates to the A

A major feature is that the UPZDOWN command of the data transmission rate is carried on the signaling channel of the CKZNACK command.

[0030] By the way, transmission speed up, down, and Z keep commands do not occur simultaneously. Also, ACKZNACK commands do not occur at the same time. In other words, if six types of commands consisting of a combination of three types of data transmission rate instruction commands and a reply command for retransmission control can be expressed and distinguished from each other, as explained in the sequence diagram of FIG. Thus, simultaneous transmission of the data transmission rate instruction command and the retransmission control reply command can be realized.

[0031] In the present invention, ACK & KEEP (corresponding to conventional ACK, hereinafter referred to as “ACK”), ACK & UP, ACK & DOWN, NACK & KEEP (corresponding to conventional NACK, hereinafter referred to as “NACK”) , NACK & UP, and NACK & DOWN are each assigned a unique bit array.

FIG. 4 is a chart showing an example of the above six types of commands. In the figure, ACK is “1111”, NACK is “0000”, ACK & UP is “1100”, ACK & DOWN is “1101”, NACK & UP is “0011”, and NACK & DOWN is “0010”. By using these bit patterns, the above data can be obtained with only one orthogonal code without using orthogonal codes for both the retransmission control reply command (ACKZNACK) and the transmission rate instruction command (UP / DOWN / KEEP). Transmission can be realized.

[0033] In addition, the terminal that is the receiving station only monitors one channel. Since CK information and transmission rate instruction information can be obtained, it is possible to suppress an increase in device scale and an increase in reception processing amount. Furthermore, since different bits are not allocated to ACKZNACK information and transmission rate instruction information, the number of bits required for signaling can be reduced. Note that FIG. 4 is not limited to the power of 4 bits, which is an example of using a 4-bit bit pattern for the above-described signaling. In addition, at the time of filing of the present invention, 3GPP determines the number of bits for each command of the retransmission control reply command (ACKZNACK) and the transmission rate instruction command (UP / DOWN / KEEP).

FIG. 5 is a chart showing an example of bit pattern allocation giving priority to reducing the false detection probability of ACKZNACK. The hamming distance is allocated as much as possible between the ACK group and the NACK group. In the figure, the Hamming distance between the ACK command and the NACK, NACK & UP and NACK & DOWN commands is 4, 3, and 3, and the average is 3.3. The Hamming distance between the ACK & DOWN command and the NACK, NACK & UP and NACK & DOWN commands is 3, 4, 2 and the average is 3.0. Furthermore, the Hamming distance between the ACK & UP command and the NACK, NACK & UP and NACK & DOWN commands is 3, 2, 4 and the average is 3.0.

[0035] These average and ming distances are always greater than those using other! /, Misalignment patterns (for example, all patterns not shown in FIG. 5 such as "0011" and "0100"). become longer. Therefore, it is possible to effectively reduce the probability of mistaken ACK for NACK or NACK for ACK.

Furthermore, in the pattern of FIG. 5, the hamming distance between UP and DOWN between different groups of the ACK group and the NACK group is increased. In other words, the hamming distance between the UP of one group and the DOWN of another group and the hamming distance between the DO WN of one group and the UP of another group are increased. . For example, in Fig. 5, NACK & DOWN and NACK & UP are set to patterns of "0001" and "0010" respectively, so that the distance between ACK & DOWN and NACK & UP, the distance between ACK & UP and NACK & DOWN, and the distance between ACK & UP and NACK & DOWN So that the distance is long (4 each) Yes.

[0037] On the other hand, it is also possible to consider a method in which NACK & DOWN and NACK & UP are bit patterns of "0010" and "0001", respectively. The hamming distance force is 2, and the distance between ACK & DOWN and NACK & UP, and ACK & UP and NACK & DOWN is short (2 each), and it is easy to mistake UP and DOWN between different groups of ACK and NACK. In order to avoid such a state, in the example shown in FIG. 5, NACK & D OWN and NACK & UP are bit patterns of “0001” and “0010”, respectively.

[0038] FIG. 6 is a chart showing an example of bit pattern allocation in which priority is given to reducing the false detection probability of transmission rate up Z down Z keep. However, as a precondition, ACK and NACK are required to obtain maximum ming distance (hamming distance between ACK and NACK is 4). As shown in the figure, in the ACK group, the mutual Hamming distance between ACK, ACK & UP, and ACK & DOWN is 2 or more (2 for 4 bits).

[0039] By the way, in the bit pattern allocation shown in FIG. 5, there are many cases where the distance is 1 and the ming distance is 1, and the bit pattern in FIG. 6 is erroneously detected between each of the up Z down Z keep. Probability can be reduced. Similarly, in the NACK group, the relationship between NACK, NAC K & UP, and NACK & DOWN is 2 or more (2 for 4 bits), and the bit pattern in Fig. 6 is up and down. The false detection probability between each of the Z keeps can be reduced.

[0040] FIG. 7 is a chart showing the Hamming distance between the ACK group and the NACK group for the bit pattern allocation shown in FIG. As is clear from the chart shown in FIG. 7, in the case shown in FIG. 6, as in the case of FIG. 5, the Hamming distance between UP and DOWN is increased between different groups of ACK and NACK. Is arranged. This arrangement effectively reduces the probability of mistaken UP and DOWN between different groups.

[0041] It should be noted that the above-mentioned bit allocation uses the same idea as above even when the number of bits given to each command of UPZDOWN and ACKZ NACK is different. By applying, a desired bit pattern can be determined.

FIG. 8 shows an example of signal arrangement in which the six types of commands (ACK, ACK & DOWN, ACK & UP, NACK, NACK & DOWN, NACK & UP) shown in FIG. 4 are arranged on the amplitude phase plane based only on the phase information. FIG. In the arrangement example shown in Fig. 8, all signal points exist on the same circle, and the signal points of the ACK group and the NACK group are spaced apart. In general, the signal point at the receiving station deviates from its normal position due to the influence of noise, etc. In the arrangement example shown in Fig. 8, the signal point is separated between the ACK group and the NACK group! / The probability of false detection from ACK to NACK or NACK to ACK is reduced. Note that the modulation unit 25 of the base station shown in FIG. 1 generates and outputs modulated signals based on these signal arrangements.

[0043] Further, as a determination criterion for each signal point, the straight line drawn in the second quadrant force to the fourth quadrant as shown in FIG. 8 is used as a determination boundary, and ACKZNA CK is based on this determination boundary. Judgment is made. In addition, up Z down Z keep judgment, for example, when ACK group is taken as an example, it has judgment boundary at 30 degree and 60 degree, phase 315 degree (-45 degree: 8 0 ^ 7 NACK judgment boundary) 30 degrees from 30 degrees, 60 degrees from 30 degrees, and signals from 60 degrees to 135 degrees (ACKZNACK judgment boundary) are judged as up, keep and down, respectively. By this method, six types of signaling instructions can be transmitted within a short time of one symbol, and the signaling efficiency can be increased.

[0044] Furthermore, if one symbol is used, it may be embedded in an existing channel defined by 3GPP (eg DPCC H: Dedicted Physical Control Channel). In this case, the channel that is simultaneously monitored by the terminal that is the receiving station Since the number can be further reduced, it is possible to suppress an increase in device scale and an increase in reception processing amount.

FIG. 9 is a diagram showing an example of signal arrangement based on the phase information and amplitude information of the six types of commands (ACK, ACK & DOWN, ACK & UP, NACK, NACK & DOWN, NACK & UP) shown in FIG. In Fig. 9, the determination is based on the criteria that ACK & DOWN is in the first quadrant, ACK & UP is in the second quadrant, NACK & UP is in the third quadrant, and NACK & DOWN is in the fourth quadrant. However, those having an amplitude value larger than the predetermined amplitude value are judged as ACK or NACK. When judging in each such quadrant This method is frequently used even in existing wireless systems! It is the same as QPSK and mapping of the modulation method, so that existing functions can be used and the equipment scale can be simplified. Have advantages.

Furthermore, in the patterns of FIGS. 8 and 9, the hamming distance between UP and DO WN is increased between different groups of ACK and NACK. In other words, ACK & DOWN and NACK & UP, and ACK & UP and NACK & DOWN are point-symmetric with respect to the origin. This arrangement can effectively reduce the probability of mistaken UP and DOWN between different groups.

[0047] FIG. 10 is a diagram illustrating an example of signal arrangement in which priority is given to reducing the false detection probability of transmission speed up Z down Z keep. For example, the signal point distance between ACK and ACK & UP or ACK and A CK & DOWN is wider than in Fig.8. Since the signal point distance is extended, it is more resistant to noise and the false detection probability of up-Z-down-Z keep can be reduced. Note that the determination of ACKZNACK is the same as in FIG. 8, and can be performed at the determination boundary provided in the second quadrant and the fourth quadrant. In addition, in order to determine up Z down Z keep in each group, a boundary may be provided at a predetermined phase angle as in FIG. Further, as shown in FIG. 11, by using the same signal arrangement as in FIG. 9, a signal having an amplitude value larger than a predetermined amplitude value may be determined as ACK or NACK.

[0048] Further, in the signal arrangements in Figs. 10 and 11, the arrangement is such that the distance between UP and DOWN is long between different groups of the ACK group and the NACK group. That is, A CK & DOWN and NACK & UP, and ACK & UP and NACK & DOWN are point-symmetric with respect to the origin. This arrangement can effectively reduce the probability of mistaken UP and DOWN between different groups.

[0049] FIG. 12 shows another signal arrangement different from the signal arrangement shown in FIGS. 8 to 11, and is used to explain a technique of using six signal points of 8-phase PSK signal points. FIG. In Fig. 12, 8-phase PSK can also determine the two threshold forces indicated by the I-axis, Q-axis, and parallel lines parallel to the I-axis. This figure shows a 3-bit bit arrangement. The first bit from the left can be determined from the vertical position with respect to the I axis, and the second bit from the left force is based on the Q axis. The determination can be made based on the left and right positions. Furthermore, the 3rd bit of the left force can be determined by the vertical position with respect to the threshold. In all of these determinations, it is not necessary to obtain the angle, so that the signal position can be easily determined.

[0050] Using these signal arrangements, for example, ACKZNACK is assigned to the first bit, and for the second and third bits, "10" is UP, "00" is DOWN, "11" and "01" Can be assigned to KEEP. In these signal arrangements, signal points can be determined using only the I axis, Q axis, and two threshold axes without using angle information, so that the configuration of the receiver can be realized easily. .

FIG. 13 is a diagram showing an example of a signal arrangement expressing only four types of commands (ACK & UP ゝ ACK & DOWN ゝ NACK & UP ゝ NACK & DOWN). As shown in the figure, ACK & UP is placed in the first quadrant, NACK & UP in the second quadrant, NACK & DOWN in the third quadrant, and ACK & DOWN in the fourth quadrant. Signaling only these four commands is exactly the same as QPSK modulation mapping, and has the advantage that the existing functions can be used and the device scale can be simplified.

FIG. 14 is a diagram showing an example of a sequence for performing transmission rate maintenance signaling using a command category including the four types of commands shown in FIG. In FIG. 14, the terminal V transmits traffic data to the base station at the data transmission rate N (step S401), and the base station transmits data to the response command NACK for the reception result of the traffic data transmitted from the terminal. Reply with speed DOWN command (step S402). The terminal transmits traffic data to the base station at the data transmission rate N-1 (step S403), and the base station adds a data transmission rate UP command to the response command ACK to the reception result of the traffic data transmitted from the terminal. Click to reply (step S404). After the process of step S404, the terminal transmits traffic data at the data transmission rate N to the base station (step S405).

[0053] In this manner, in the processing of step S401 to step S405, signaling is performed once each for increasing and decreasing the data transmission rate, and the data transmission rate is maintained. This signaling method allows the transmission rate used by the terminal to rise and fall instantaneously. [0054] In the above signaling method, there is a reason why the data transmission rate up command is executed later. If the up command is executed first, there is a possibility that the reception level will rise undesirably as a base station. In other words, the amount of interference with other channels is increased. In order to prevent this phenomenon, the target terminal can be used with two commands that do not give large interference to other channels, as shown in Fig. 14. Data transmission speed keep instruction can be realized.

[0055] Incidentally, in 3GPP, there are roughly two types of transmission channels: common channels and dedicated channels. Among these channels, the common channel is a channel for notifying all terminals of common information, or for sharing information with multiple terminals and adding a destination when necessary to notify information to a specific terminal. The dedicated channel is a channel used exclusively for a specific terminal. On the other hand, the transmission rate UPZDOWN and ACKZNACK signaling that have been described so far according to the present invention are not limited to the types of common channels and individual channels. It may be used.

Next, a method for specifying a channel for signaling UPZDOWNZKEEP and ACKZNACK will be described. FIG. 15 is a diagram illustrating a state in which the transmission rate UPZDOWNZKEEP signaling is performed on the same channel as the channel used to explicitly notify the maximum transmission rate at the time of channel assignment. The operation will be described below. In the figure, the terminal monitors a plurality of downlink channels (eg, Al, A2) in order to have a predetermined channel assigned. For example, the channel assignment is transmitted to the target terminal at a certain timing (step S501). In this step, when the terminal uses the uplink channel, the maximum transmission rate allowed is explicitly notified. The target terminal to which the predetermined channel is assigned transmits the traffic data using, for example, the uplink channel B1 (step S502, step S503). On the other hand, the base station may signal UPZDOWNZKEEP of the transmission rate to the terminal during communication (step S504). At this time, the channel used for the channel allocation is the same channel ( In the example of Fig. 15, channel A1) can be allocated. This By making the channel the same, the number of required orthogonal codes can be reduced. In addition, since the commitment to use the same channel is predetermined, the number of channels for monitoring UPZDO WNZKEEP instructions can be limited, and the scale of the device and the amount of reception processing can be reduced.

Figure 16 is a diagram showing how the transmission rate up, down, and Z maintenance signaling is performed on the channel corresponding to the channel used to explicitly notify the maximum transmission rate at the time of channel assignment. FIG. 17 is a chart showing channels for channel assignment and transmission. Only the differences from FIG. 15 in the operation shown in FIG. 6 are described (step S604). Note that the correspondence between channel A1 and channel C1 is, for example, the force that also specifies the force such as a predetermined rule. These are given by the terminal as a correspondence table as shown in FIG. Alternatively, the channel number may be specified from a calculation formula. As described above, when a channel corresponding to one-to-one is used, it is possible to limit the channel for the terminal to monitor the UPZDOWNZKEEP instruction, and to reduce the device scale and the reception processing amount.

By replacing with K signaling, the same effects as the above-described processing can be obtained from the viewpoint of monitoring ACK / NACK signaling and their signaling signals. The operation of A CKZNACK signaling is not specifically illustrated, but the number of required orthogonal codes can be reduced by using the same channel as the channel used for channel assignment as ACK / N ACK signaling, In addition, since the channel over which the terminal monitors ACKZNACK can be limited, control processing can be simplified, and the terminal hardware scale can be reduced. Furthermore, by using a channel that has a one-to-one correspondence with the channel used for channel assignment as ACKZNACK signaling, at least the channel that monitors terminal power S ACKZNACK can be limited, reducing the scale of the device and the amount of reception processing. You can do it. [0059] When UPZDOWNZKEEP signaling and ACKZNACK signaling commitments are used in combination, the above-described technique in which both of the above signalings are combined can be applied.

[0060] As described above, according to the base station apparatus and signaling method of the present invention, the data transmission rate UPZDOWN (in addition to these, the data transmission rate KEEP "KEEP" is added) and ACKZNACK are transmitted on the same channel. Equipped with a mechanism to efficiently notify both UPZDOWNZKEEP and ACKZNAC κ simultaneously from the transmitting station (for example, base station) to the receiving station (for example, terminal) using the number of bits prepared for the signaling of these data. Method).

[0061] Also, according to the base station apparatus and the signaling method according to the present invention, if the erroneous detection of ACKZNACK is correct rather than the erroneous detection of data transmission speed UPZDOWNZKEEP and adversely affects data transmission, ACK is transmitted. By assigning a bit array that increases the hamming distance between the group indicating NACK and the group indicating NACK, it is possible to obtain a bit array that prioritizes reducing the false detection probability of ACKZNACK transmission.

[0062] Also, according to the base station apparatus and the signaling method that work on the present invention, the erroneous detection of the data transmission rate UPZDOWNZKEEP has a greater influence on other communications as interference than the erroneous detection of ACKZNAC κ. Reduce the probability of false detection of data transmission rate UPZDOWNZKEEP by allocating a bit arrangement that increases the hamming distance between data transmission rates UPZDOWNZKEEP in each of ACK group and NACK group Can be a bit array that prioritizes.

[0063] Also, according to the base station apparatus and the signaling method that are relevant to the present invention, the ACK is assigned by assigning a bit array so that the data distance between the data transmission speed UP and the data transmission speed DOWN becomes long. It is possible to reduce the false detection probability between different groups of the indicated group and the group indicating NACK.

[0064] Further, according to the base station apparatus and the signaling method according to the present invention, using the phase and amplitude at the time of signal transmission, the data transmission rate UPZDOWNZKEEP, and further ACK and NA

CK can be expressed by one symbol. In this case, the priority is given to reducing the false detection of ACKZNACK over the erroneous detection of UPZDOW NZKEEP of the data transmission rate. It is also possible to use a grid array. On the other hand, it is a bit array that prioritizes reducing the false detection of UPZDOWNZKEEP of the data transmission speed over the false detection of ACKZNACK.

[0065] Further, according to the base station apparatus and the signaling method that work on the present invention, the distance between the data transmission rate UP and the data transmission rate DOWN is increased between different groups of the ACK indicating group and the NACK indicating group. In addition, it is possible to reduce the mutual false detection probability

[0066] Also, according to the base station apparatus and signaling method that are useful in the present invention, the data transmission rate UPZDOWNZKEEP and ACKZNACK can be expressed using the signal points of 8-phase PSK, and the signal position Determination can be performed easily.

[0067] Further, according to the base station apparatus and signaling method according to the present invention, only the data transmission rate UPZDOWN and ACKZNACK are notified by one signaling, and the data transmission rate KEEP is the sum of the data transmission rates UP and DOWN. Since it is expressed by signaling twice, the device scale can be simplified.

[0068] Also, according to the base station apparatus and signaling method according to the present invention, when the data transmission rate KEEP is expressed by the above two times of signaling, the data transmission rate DO WN is first indicated, and then Since the data transmission speed UP is instructed, it does not cause any significant interference to other channels. Therefore, even if the apparatus scale is simplified, the function is not impaired.

[0069] Further, according to the channel selection method according to the present invention, the channel that performs UPZDOWNZK EEP signaling of the transmission rate is, for example, a channel that is used to explicitly notify the maximum transmission rate as channel assignment. Since they are the same, the number of required orthogonal codes can be reduced. Further, since the terminal can limit the channels for monitoring the transmission rate UPZDOWNZ KEEP instruction, it is possible to simplify the control process and reduce the scale of the terminal nodeware. Furthermore, by using a channel that corresponds to the channel used for channel assignment as a one-to-one correspondence for ACKZNACK signaling, at least the terminal can monitor the channel for UPZDOWNZKEEP indication of the transmission rate, and the device scale and reception processing amount can be limited. Can be reduced. [0070] Also, according to the channel selection method according to the present invention, the channel for performing ACKZNACK signaling is the same as the channel used to explicitly notify the maximum transmission rate as channel assignment. Can reduce the number of orthogonal codes

. In addition, since the channel over which the terminal monitors ACKZNACK can be limited, control processing can be simplified, the terminal can be reduced, and the scale of software can be reduced. Furthermore, by using a channel that corresponds to the channel used for channel allocation on a one-to-one basis as A CKZNACK signaling, at least the channels that the terminal monitors for ACKZNACK can be limited, and the device scale and the amount of reception processing can be reduced. .

Industrial applicability

[0071] As described above, the base station apparatus, the signaling method, and the channel selection method according to the present invention are useful as a communication system or a communication method that realizes efficient data transmission. Suitable for communication systems.

Claims

The scope of the claims

[1] A command generation unit that receives transmission data transmitted from the terminal device and generates a retransmission control reply command (ACKZNACK) indicating successful reception and Z failure, and a signal generated based on the signal generated by the command generation unit. A base station device comprising: a modulation unit that generates a modulation signal to be returned to the terminal device;

The command generation unit generates a command by superimposing a data transmission rate instruction command (UPZ DOWNZKEEP) indicating transmission rate increase, Z decrease, and Z maintenance, which is allowed for the terminal device, on the retransmission control reply command. Base station apparatus.

[2] A total received signal level status management unit that manages the total received signal level of received signals from a plurality of terminal devices including the terminal device to be controlled,

The command generation unit selects one of the transmission rate instruction commands (UPZDOWNZKEEP) of the terminal device to be controlled based on the output result of the total received signal level state management unit. The base station apparatus according to claim 1.

[3] The base station apparatus according to claim 1, wherein the command generation unit generates a bit pattern representing six types of commands, each of which is a combination of each command of UPZDOWNZKEEP and each command of ACKZNACK.

[4] The above six commands are ACK & KEEP, ACK & UP, ACK & DOWN, and NACK.

4. The base station apparatus according to claim 3, wherein the base station apparatus is a & KEEP, NACK & UP, or NACK & DOWN command.

[5] The base station apparatus according to claim 3, wherein the command generation unit performs bit allocation that prioritizes reducing ACKZNACK error detection over data transmission rate UPZDOWNZKEEP error detection. .

[6] Of the six types of commands, commands including ACK commands are defined as ACK groups, and N

When a command including the ACK command is a NACK group,

The command generation unit performs bit allocation so that a mutual distance between bit patterns representing UPZDOWNZKEEP of a data transmission rate becomes long between each ACK of the ACK group and the NACK group. The base station apparatus according to claim 3, wherein the base station apparatus is characterized.

[7] Of the six types of commands, commands including ACK commands are defined as ACK groups, and N

When a command including the ACK command is a NACK group,

The command generator may increase the data transmission rate and the data transmission rate DOWN between the different groups of the ACK group and the NACK group. 4. The base station apparatus according to claim 3, wherein bit allocation is performed so as to be longer than a ming distance between expressed bit patterns or between bit patterns expressing a DOWN transmission rate.

[8] The modulation unit can transmit six types of commands, which are combinations of UPZDOWNZKEEP commands and ACKZNACK commands, in one symbol based on the phase information and amplitude information of the transmission data. The base station apparatus according to claim 1, wherein the base station apparatus generates a modulation signal.

9. The base station apparatus according to claim 8, wherein the modulation unit generates a modulation signal that prioritizes reducing ACKZ NACK false detection over erroneous detection of data transmission rate UPZDOWNZKEEP. .

[10] Of the six types of commands, when a command including an ACK command is an ACK group and a command including a N ACK command is a NACK group,

The modulation unit generates a modulation signal giving priority to reducing erroneous detection between a data transmission rate UP and a data transmission rate DOWN between different groups of the ACK group and the NACK group. The base station apparatus according to claim 9, wherein:

[11] The base station according to claim 8, wherein the modulation unit generates a modulation signal in which priority is given to reducing erroneous detection of UPZDOWNZ KEEP of a data transmission rate over erroneous detection of ACKZNACK. apparatus.

[12] Of the six types of commands, when a command including an ACK command is an ACK group and a command including a N ACK command is a NACK group,

The modulation unit generates a modulation signal giving priority to reducing erroneous detection between a data transmission rate UP and a data transmission rate DOWN between different groups of the ACK group and the NACK group. The base station according to claim 11, wherein apparatus.

[13] The base station apparatus according to claim 1, wherein the modulation unit associates six types of commands, each having a combination force of each command of UPZDOWNZKEEP and each command of ACKZNACK, with a signal point of 8-phase PSK. .

[14] A command generation unit that receives transmission data transmitted from the terminal device and generates a retransmission control reply command (ACKZNACK) indicating successful reception and Z failure, and a signal generated based on the signal generated by the command generation unit. A base station device comprising: a modulation unit that generates a modulation signal to be returned to the terminal device;

The command generation unit combines the retransmission control reply command (ACKZNACK) with a data transmission rate instruction command (UPZDOWN) indicating an increase in transmission rate allowed for the terminal device, a lowering of Z, and a maintenance of Z. ACK & UP ゝ ACK & DOWN ゝ NAC Generates a bit pattern that represents each of the four types of commands K & UP and NACK & DOWN. Within each of the four types of commands, the ACK group, which is a command group including the ACK command, and the NACK group, which is a command group including the NACK command. A base station device that realizes ACK & KEEP or NACK & KEEP by command transmission twice in total using the above command.

15. The base station apparatus according to claim 14, wherein, of the total two command transmissions, the DOWN command is used for the previous command transmission and the UP command is used for the subsequent command transmission.

[16] A communication system including a step of generating a retransmission control reply command (ACKZNACK) indicating successful Z failure for each of transmission data transmitted from a terminal device and returning it to the terminal device. In the signaling method:

A command generation step for generating a command in which a data transmission speed instruction command (UP / DOWN / KEEP) indicating the increase in transmission speed allowed for the terminal device, Z decrease, and Z maintenance is superimposed on the reply command for retransmission control. A communication system sidenering method comprising:

[17] The command generation step includes UPZDOWNZKEEP commands and ACKZNAC 17. The signaling method for a communication system according to claim 16, wherein a bit pattern expressing six types of commands composed of combinations with K commands is generated.

[18] In a system that explicitly indicates the maximum transmission rate to the terminal as a channel assignment, the channel that performs subsequent UPZDOWNZKEEP signaling of the maximum transmission rate was used to explicitly notify the maximum transmission rate. A channel selection method in which a channel is the same as a channel or has a one-to-one correspondence with the channel.

[19] In a system that explicitly indicates the maximum transmission rate to the terminal at the time of channel assignment, the channel that performs subsequent ACKZNACK signaling must be the same as the channel used to explicitly notify the maximum transmission rate, Alternatively, a channel selection method that makes the channel corresponding to the channel one-to-one.