KR20030001649A - Methode for indicating data transmitted in cdma mobile communication system - Google Patents

Abstract

PURPOSE: An apparatus and a method for informing whether a signal received in a UE(User Equipment) exists in a CDMA(Code Division Multiple Access) mobile communication system are provided to inform by using a dedicated control channel whether a signal of a common control channel including information necessary for receiving an HS-DSCH(High Speed-Downlink Shared Channel) exists or not. CONSTITUTION: A CPICH(Common Pilot Channel) estimator(3001) performs a channel estimation per every slot or every frame. A separator(3002) receives a pilot and an indicator from a cell 1 which transmits an HS-DSCH, and separates the pilot and the indicator. A signal decider(3003) receives an HS-DSCH indicator, analyzes the HS-DSCH indicator, multiplies a sign of the HS-DSCH indicator by 1 to invert the sign of the HS-DSCH indicator when the sign of the HS-DSCH indicator is different from a sign of the pilot, and transmits the HS-DSCH indicator to a switch(3004). In case that the sign of the HS-DSCH indicator is identical to the sign of the pilot, the signal decider(3003) immediately transmits the HS-DSCH indicator to the switch(3004). The switch(3004) transmits or does not transmits the HS-DSCH indicator modified by the signal decider(3003) on the basis of the CHICH estimation value received from the CPICH estimator(3001). An SIRest generator(3005) generates an SIRest using pilot bits received from the cell 1 and a cell 2 which does not transmit the HS-DSCH.

Description

Code division multiple access device and method for informing a terminal device whether there is a signal to receive {METHODE FOR INDICATING DATA TRANSMITTED IN CDMA MOBILE COMMUNICATION SYSTEM}

The present invention relates to informing a mobile station whether there is data to be received by a base station apparatus of a code division multiple access communication system, and in particular, whether there is a signal of a common control channel including information necessary for receiving an HSDSCH signal. An apparatus and method for notifying using a dedicated control channel are disclosed.

In general, the HSDPA collectively refers to control channels associated with a high speed-downlink shared channel (HS-DSCH) for supporting forward high speed packet transmission in a UMTS communication system. In order to support high-speed packet transmission in the HSDPA, the following three schemes are newly introduced. Adaptive Modulation and Coding (AMC) first determines the modulation method and coding method of the data channel according to the channel state between the cell and the user, thereby increasing the efficiency of the entire cell. give. The combination of the modulation scheme and the coding scheme is called a modulation and coding scheme (MCS) and may define a plurality of MCSs from level 1 to level n. The AMC means a method of adaptively determining the level of the MCS according to a channel state between a user and a cell, thereby increasing the overall use efficiency.

Next, a multi-channel stop and wait hybrid retransmission request (n-channel SAW HARQ) scheme is described as follows.

In the conventional ARQ method, an acknowledgment signal (ACK) and a retransmission packet are exchanged during a control period of a user terminal and a base station. However, in the HSDPA, the ACK and the retransmission packet are exchanged between the user equipment and the MAC HS-DSCH of the base station. Also, by configuring n logical channels, it is possible to transmit several packets without receiving ACK. In more detail, In the conventional Stop and Wait ARQ scheme, the next packet can be transmitted only after receiving the ACK of the previous packet. This method has a disadvantage in that it is possible to wait for an ACK despite being able to transmit a packet. In n-channel SAW HARQ, a plurality of packets can be continuously transmitted without receiving an ACK, thereby improving channel utilization efficiency. If n logical channels are set between the user terminal and the base station, and the channels are identified by a specific time or explicit channel number, the receiving user terminal knows which channel the packet received at any point in time is. And reconstruct packets in the order in which they must be received.

Finally, the fast cell selection (FCS) is described as follows. When the user terminal using the HSDPA enters the soft handover region, the packet is transmitted only from the cell maintaining the best channel state to reduce the overall interference. In addition, when the cell providing the best channel state is changed, the packet is transmitted using the HS-DSCH of the cell, and the transmission disconnection time is reduced as much as possible.

As described above, in order to apply the newly introduced technique, it is necessary to exchange the following new control signals between the user terminal and the base station. In order to support AMC, the user terminal should give information on a channel between the terminal and the base station, and the base station should inform the MCS level determined according to the channel situation. In order to support n-channel SAW HARQ, the user terminal should transmit an ACK or a negative acknowledgment (NACK) signal to the base station. In order to support the FCS, the user terminal should transmit an optimal cell notification signal indicating the base station providing the best channel to the base station. In addition, when the optimal cell is changed, the base station should be notified of the packet reception status of the terminal at that time. The base station should provide necessary information for the terminal to correctly select the optimal cell.

9 illustrates a reverse dedicated physical channel structure between a terminal and a base station not supporting the existing HSDPA. In the reverse dedicated physical channel structure that does not support the existing HSDPA shown in FIG. 9, a new channel structure is needed because information necessary for HSDPA cannot be transmitted. Examples of a reverse dedicated physical control channel for supporting HSDPA discussed so far are shown in FIGS. 10 and 11. 9, 10, and 11 will be described in detail below.

In the reverse dedicated physical channel that does not support the conventional HSDPA shown in FIG. 9, one frame includes 15 slots (slot # 0 to slot # 14). The reverse dedicated physical channel includes a reverse dedicated physical data channel (DPDCH) and a reverse dedicated physical control channel (DPCCH). Higher layer data transmitted from the terminal to the base station are transmitted through respective slots constituting one frame of the reverse dedicated physical data channel (DPDCH).

On the other hand, each slot constituting one frame of the reverse dedicated physical control channel is composed of a pilot symbol, a transmission format combination indication (TFCI) bit, an FBI symbol and a transmission output control symbol (TPC). The pilot symbol is used as a channel estimation signal when the terminal demodulates data transmitted to the base station, and the TFCI bits indicate which transmission type combinations are used by the channels transmitted during the frame currently being transmitted. The FBI symbol transmits feedback information when the transmit diversity technique is used, and the transmit output control symbol (TPC) is a symbol for controlling the transmit output of the forward channel. The reverse dedicated physical control channel is spread by using an orthogonal code and transmitted, and a spreading factor (SF) used at this time is fixed at 256.

10 illustrates an example of a slot structure for supporting HSDPA by changing a slot structure of a backward dedicated physical control channel that does not support existing HSDPA. In the slot structure of FIG. 10, SF = 128 enables transmission of more bits at the same chip rate. Therefore, it is possible to transmit not only control information for the dedicated physical data channel but also control information for HSDPA, and the same slot structure is used for every slot. In FIG. 10, pilot, TFCI, FBI, TPC, and the like are used to indicate the same information as when HSDPA is not supported. Ack indicates whether an error is detected when receiving downlink HSDPA data, and Meas is used to transmit a downlink channel state measured by a terminal to a base station to determine an appropriate MCS level during downlink data transmission.

11 illustrates another example of a slot structure for supporting HSDPA by changing a slot structure of a backward dedicated physical control channel that does not support existing HSDPA. Similar to the slot structure of FIG. 10, SF = 128 is used to enable the transmission of more bits at the same chip rate. Therefore, it is possible to transmit control information for HSDPA as well as control information for the dedicated physical data channel. The slot structure of FIG. 11 is different from the slot structure of FIG. 10 in which the same slot structure is used for every slot, so that the slot structure of the dedicated physical control channel can be changed in the TTI consisting of three slots. Can be sent. That is, as shown in (a) of FIG. 11, only control information for a dedicated physical data channel is transmitted, or as shown in (b), control information for HSDPA is transmitted in the first two slots in the TTI and dedicated in the last slot. Transmit information for the physical data channel, control information for the dedicated physical data channel is transmitted in the first two slots in the TTI as in (c) and Ack / Nack information is transmitted in the last slot, or in (d) Likewise, the first two slots transmit control information for HSDPA except Ack / Nack, and the last slot transmits Ack / Nack, so that the slot structure in the TTI can be different for each slot. As such, the ACK information is transmitted only in one slot in the TTI, and control information for other HSDPA or control information for a dedicated physical data channel is transmitted in the other slots so that the base station processes the ACK to determine whether to retransmit the HSDPA data and perform retransmission. You can give them plenty of time to prepare.

When both the base station and the terminal provides the HSDPA service, since the base station and the terminal both know the uplink-specific physical control channel structure as shown in FIGS. 10 and 11, data can be transmitted through the uplink-specific physical data channel. . On the other hand, when the terminal is located in a soft handover region (SHO) where service areas of several base stations overlap, a situation in which not only the base station supporting the HSDPA service but also the base station not supporting the HSDPA may communicate with the terminal. However, in the case of the base station that does not support HSDPA, since the uplink-specific physical control channel structure as shown in FIG. 10 and FIG. 11 is not known, the terminal supporting the HSDPA service is uplink-only as shown in FIGS. 10 and 11. In the case of using the physical control channel structure, there is a problem that a base station that does not support HSDPA does not receive control information transmitted for data transmitted through an uplink-specific physical data channel.

Therefore, even if the terminal supporting the HSDPA service is located in a SHO including both the base station supporting the HSDPA service and the base station not supporting the HSDPA, the control information transmitted for the data transmitted through the uplink-specific physical data channel is determined by the HSDPA. The uplink-specific physical control channel should be designed to be received by the base station not supporting. That is, the uplink-specific physical control channel should be designed to maintain compatibility between the terminal supporting the HSDPA service and the base station not supporting the HSDPA.

In addition, in configuring downlink channels required to support HSDPA, backward compatibility should be considered for a UE that simultaneously receives a base station signal that does not support HSDSCH.

Information to be transmitted from the base station to the terminal to support the HSDPA service includes the following.

1) HSDPA indicator: Indicate whether there is HSDPA data to be received by the terminal.

2) MCS level: Informs the modulation and channel coding method to be used in the HS-DSCH channel.

3) HS-DSCH channelization code: channelization code information used for a specific terminal in the HS-DSCH channel

4) HARQ process number: n-channel SAW When HARQ is used, it informs a channel to which a specific packet belongs among logical channels for HARQ.

5) HARQ Packet Number: When the optimal cell is changed in the FCS, the UE informs the terminal of the downlink data packet number so that the UE can inform the newly selected optimal cell of the transmission state of the HSDPA data.

In addition to the above information, when the UE informs the neighboring base stations of the selected optimal cell, it may occur that each base station needs to add an offset to the uplink transmission power so that the base station can receive the optimal cell information transmitted by the terminal well. However, the offset value of the uplink transmission power may inform the terminal from the base station. In addition, information indicating retransmission or information indicating the number of retransmissions may be transmitted in the HARQ operation. When the base station transmits high speed packet data using the HS-DSCH and the UE receives the high speed packet data, the uplink and downlink dedicated channels defined in the existing RELEASE 99 standard are used. The dedicated channel used at this time is called a dedicated channel related to HSDPA. Therefore, for the HSDPA communication, there are signals transmitted in the dedicated channel related to HSDPA in addition to the above information.

Among the above information, 1) the HSDPA indicator needs to transmit a channel different from 2) to 5 times. Because the data of 2) to 5) are information necessary for the UE to receive the HSDSCH and are not necessary when the HSDSCH data is currently planned to be sent to other UEs, 1) after receiving the information 2) This is because the battery consumption of the UE can be reduced by determining whether to receive a signal of a channel including the information.

The structure of the forward dedicated physical channel defined in Release-99 that does not support the existing HSDPA service is shown in FIG. 16. Each field is described as follows. The Data1 and Data2 fields transmit data for supporting dedicated services such as voice or data for supporting higher layer operations. The TPC field transmits a downlink transmission power control command for controlling uplink transmission power, and the TFCI field transmits transmission format combination information of the Data1 and Data2 fields. A pilot is a predetermined sequence of symbols used by the UE to estimate the downlink channel state.

In the structure of the forward dedicated physical channel defined in R-99 shown in FIG. 16, since a base station cannot transmit information to be informed to the terminal for the HSDPA service, a new forward dedicated physical control channel structure is provided for the HSDPA service. need. On the other hand, since the terminal supporting the HSDPA may receive data packets through the HS-DSCH channel from the HSDPA base station and at the same time receive data from the HSDPA base station and the base station not supporting the HSDPA through the forward dedicated physical channel. However, forward dedicated physical control channels for HSDPA should be designed to support not only HSDPA services but also those services supported by the existing Release 99 standard.

An object of the present invention is to provide an apparatus and a method for transmitting forward and reverse control channels to maintain compatibility between a base station and a terminal that does not support the HSDPA service and a base station and the terminal that support the HSDPA service.

Another object of the present invention is to provide a communication apparatus and method for a forward transmission scheme for supporting an HSDPA service.

Another object of the present invention is to provide a method for role sharing between a forward dedicated channel and an HSDPA common control channel to support an HSDPA service.

It is still another object of the present invention to provide a method for a base station transmitting a forward dedicated channel when a terminal receiving an HSDPA service and handover receiving the terminal.

The present invention according to the first aspect for achieving the above object is to transmit the control information required to support the HSDPA to the mobile station through the forward dedicated control channel in the base station of the mobile communication system each frame or The control information required for supporting the HSDPA is recorded and transmitted in predetermined bits among the pilot bits allocated to the slot.

According to an aspect of the present invention to achieve the above object, a terminal for transmitting control information required for HSDPA support among pilot bits allocated for each frame or slot of a forward dedicated channel in a terminal of a mobile communication system is provided. The pilot information of the first base station transmitting the pilot information by the remaining bits except the second base station transmitting only the pilot information by the pilot bits allocated for one frame of the forward dedicated channel Determining whether to combine the control information required for the support of the HSDPA from the first base station and the pilot information from the second base station at the same time, and the control information required for the support of the HSDPA. Is not matched with the pilot information from the first base station when no combining is required. Combining the pilot information from the second base station in corresponding bit units, and when the combining with the control information required for supporting the HSDPA is requested, the control information and the pilot from the first base station; And combining the information and the pilot information from the second base station in corresponding bit units.

According to a third aspect of the present invention, a base station of a mobile communication system transmits HS-DSCH indicators for each of a plurality of mobile stations through a common indicator channel, and according to the spread rate of the common indicator channel. Determining a number of mobile stations to provide the HS-DSCH indicators that can be transmitted through the common indicator channel, and correspondingly determining the number of mobile stations in one-to-one correspondence to each of the bits constituting the common indicator channel. And recording and transmitting HS-DSCH indicators corresponding to each of the mobile stations in bits of the common indicator channel.

1 is a diagram illustrating a conventional downlink transmitter structure.

2 is a diagram illustrating an example of a feedback process through a reverse channel of control information according to the present invention.

3 illustrates another example of another feedback process through a reverse channel of control information according to the present invention.

4 is a diagram illustrating an example of configuration of control information of a reverse dedicated physical control channel for HSDPA according to the present invention;

5 is a diagram showing another example of control information configuration of a reverse dedicated physical control channel for HSDPA according to the present invention;

6 is a diagram illustrating a process of transmitting EQS information through a reverse dedicated physical data channel according to the present invention.

7 is a diagram illustrating a terminal transmission device according to the present invention.

8 is a diagram illustrating a base station receiver according to the present invention.

9 illustrates a conventional reverse dedicated physical channel.

10 illustrates an example of a reverse dedicated physical control channel for a conventional HSDPA.

11 illustrates another example of a reverse dedicated physical control channel for a conventional HSDPA.

12A and 12B illustrate an example of a reverse dedicated physical channel according to the present invention.

13A and 13B illustrate another example of a reverse dedicated physical channel according to the present invention.

14A and 14B illustrate another example of a reverse dedicated physical channel according to the present invention.

15A and 15B illustrate another example of a reverse dedicated physical channel according to the present invention.

16 illustrates a conventional forward dedicated physical channel.

17 illustrates an example of a forward dedicated physical channel and an SHCCH channel for transmitting HSDPA control information according to the present invention.

18 illustrates another example of a forward dedicated physical channel and an SHCCH channel for transmitting HSDPA control information according to the present invention.

19 illustrates another example of a forward dedicated physical channel and an SHCCH channel for transmitting HSDPA control information according to the present invention.

20 is a diagram illustrating a terminal receiving apparatus for simultaneously receiving signals transmitted from an HSDPA base station and a conventional base station according to the present invention.

21 illustrates another example of a forward dedicated physical channel according to the present invention.

22 is a diagram showing a base station transmitter according to the present invention.

FIG. 23 is a diagram illustrating a terminal receiver corresponding to the base station transmitter of FIG. 22; FIG.

24 shows another base station transmitter according to the present invention;

FIG. 25 is a diagram illustrating a terminal receiver corresponding to the base station transmitter of FIG. 24.

26 to 29 are diagrams showing examples of pilot bit information from two cells and information combining the same according to an embodiment of the present invention.

FIG. 30 is a diagram illustrating hardware for combining pilot bits and HS-DSCH indicator information received from different cells according to an embodiment of the present invention. FIG.

31 to 33 illustrate a case in which multiple UEs share an S-DPCH according to an embodiment of the present invention.

34 shows an example of a CHICH structure according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, in configuring forward and reverse dedicated physical control channels for HSDPA, dedicated physical control for maintaining compatibility between the existing R-99 terminal and the base station that does not support the HSDPA service and the terminal and base station supporting the HSDPA service An apparatus and method for transmitting a channel will be provided.

In addition, an apparatus and method for transmitting a forward dedicated channel of a cell transmitting HSDPA data in a forward direction and a cell not transmitting HSDPA when the terminal is in a handover region will be described.

First, in the first embodiment, a method of transmitting control information for the HSDPA service in the reverse direction and a reverse dedicated physical control channel for actually transmitting the control information using FIGS. 2 to 6 and 12 to 15 are described. Examples of how to construct are given. In configuring a reverse control channel for HSDPA, in addition to the existing reverse control channel, a method of using one number of new reverse control channels in a manner of transmitting necessary control information through a new control channel for supporting HSDPA and at least one new control channel. Two ways of defining the reverse control channel are conceivable. In the reverse direction, all user terminals can allocate all Orthogonal Variable Length Spreading Factor (OVSF) codes, and thus, channelization code resources are abundant. When modifying the existing reverse control channel, there may be a problem in compatibility with the existing system and the channel structure is very complicated. Therefore, the present invention provides a method of newly defining the reverse control channel using a new channelization code. do. When the reverse dedicated physical control channel is newly defined using the new channelization code for the HSDPA as described above, the existing reverse physical control channel is also transmitted even when the HSDPA service is performed. Even when communicating with a base station, there is no need to change the slot structure. The new reverse control channel shown below will be referred to as HS-DPCCH. Control information to be transmitted in the reverse direction to support HSDPA is as follows. First, the user terminal should report the channel quality to the base station. Typically, the channel quality is determined through the received signal coded power (RSCP) of the common pilot channel (CPICH). At this time, the user terminal measures not only the channel quality of the optimal cell to which it belongs, but also the channel quality of all adjacent receivable cells, and the channel quality reported to the base station is the channel quality between the base station and the user terminal. In the present invention, the channel quality information is referred to as CQI (Channel Quality Indication). In the HSDPA, the user terminal checks whether the data transmitted by the base station is in error and transmits the result in an acknowledgment signal (ACK) or a negative acknowledgment signal (NACK). In general, in the SAW ARQ method, ACK or NACK can be represented by 1 bit, and since HSDPA uses the n-channel SAW ARQ method, only 1 bit is allocated to the ACK / NACK signal. In the present invention, information indicating whether or not the transmitted data is error is called ACK / NACK. As described above, the user terminal measures the channel quality of not only an optimal cell communicating with itself but also all neighboring cells. At this time, if any neighbor cell has a better channel quality than the current optimal cell, the user terminal designates the neighbor cell as a new optimal cell, and communicates with the new optimal cell. At this time, it should be informed that the neighboring cell having better channel quality than the current optimal cell has become a new optimal cell, and this control information is called BCI (Best Cell Indication) in the present invention. In order to perform the above-described FCS, the new optimal cell should be informed of the reception status of the user terminal. At this time, the reception status of the user terminal can be informed using a set of identifiers of packets received so far, and serial numbers are assigned to the packets, and these serial numbers are assigned to the old best cell and the new best cell. If it is managed consistently in the Best Cell) and the user terminal, the reception status of the user terminal may be delivered with only a smaller amount of information. In the present invention, the reception status of the user terminal is called EQS (End Queue Status). In addition, channel estimation is required for the receiver station to receive the reverse information in addition to the above information, and a pilot channel for such channel estimation and a power control bit for reverse power control are required. .

In summary, the information to be transmitted through the reverse control channel proposed by the present invention may include CQI, ACK / NACK, BCI, EQS, pilot channel, and power control signal.

The information may be classified into two types according to a point in time to be transmitted again. If CQI, ACK / NACK and BCI should be sent regularly, EQS should be sent only when FCS is executed. Since the BCI is closely related to the FCS, it may be regarded as information to be transmitted only when the FCS is executed. However, in the present invention, the BCI is periodically transmitted to increase the reliability of the BCI.

The physical layer channel capable of transmitting the information to the base station includes a dedicated physical control channel (DPCCH) and a dedicated physical data channel (DPDCH). In case of transmitting control information through DPCCH, the advantage is that fast transmission is possible, and the disadvantage is that the amount of data that can be sent is limited and should always be transmitted. In case of transmitting control message through DPDCH, the advantage is that transmission is possible only when necessary, and the disadvantage is that the time required for information transmission is long. In consideration of the advantages and disadvantages of DPCCH and DPDCH, in the present invention, information transmitted only when FCS is executed, that is, EQS is transmitted through DPDCH and information transmitted with periodicity, that is, CQI, ACK / NACK, and BCI are transmitted through DPCCH. In the existing UMTS system, the term DPCCH refers to a control channel of the DCH, so the DPCCH proposed by the present invention is referred to as HS-DPCCH (High Speed-DPCCH). The information having the periodicity is transmitted in units of time to interleaving (TTI). A more detailed description of TTI follows. FIG. 1 illustrates a transmitter of a base station. Referring to FIG. 1, a transmitter of a base station is shown. First, as shown in 101, the MAC HS-DSCH of a base station sends down transport blocks to a physical layer. In this case, the transport block means that the MAC header is attached to the data obtained by segmentation in the upper layer. When the transport blocks are input to the tail bit generator 102, the tail bit generator 102 outputs mixed tail bits in time to improve encoding performance. Then, the transport blocks in which the tail bits are output together are inputted to the encoder 103, turbo coded, and output as encoded symbols. The output code symbols are input to the rate matcher 104, and the code symbols are repeated by repetition and puncturing the symbols so as to match the number of symbols that can be transmitted in the TTI-Transmition time interval. Then, the rate-matched symbols are input to the interleaver 105 and interleaved the input signals and then applied to the signal converter 106. The signal converter 106 transmits the input interleaved symbols such as QPSK, 8-PSK, and M-ary QAM. It modulates the signal and outputs it to the demultiplexer. Then, the demultiplexer demultiplexes the converted modulated signals into M symbol strings sequentially and outputs the demultiplexers. Then, the M symbol strings are multiplied with other OVSF orthogonal codes and applied to the adder, and then output after the M symbol strings are summed in symbol units. At this time, the input of 103 is called a coding block. In general, the coding block and the transport block have different sizes, and the tail bit of 102 is used to correct the size difference. At any point in time, the TTI refers to the time required until the transmission of the coding block at that point in time, and has a slot unit. That is, if three slots are required to transmit an arbitrary coding block, the TTI is three slots. The factors for determining the TTI are the size of the coding block, the MCS level, the number of allocated channelization codes, and the SF. The process of determining the TTI in more detail is as follows. As described above, the MCS is determined according to the channel quality of the corresponding time point, and is composed of a combination of a turbo coding rate and a modulation scheme. For example, if the channelization code allocation unit is a channelization code of SF 32, it has a transmission capacity of 80ksps (symbol per second) per channelization code. If the modulation scheme of the MCS level allocated to any coding block transmission is 64QAM and the turbo coding rate is 0.5, this MCS level is capable of transmitting 3 bits per symbol. Can be. Therefore, if the MCS level allocated to the transmission of this coding block is the same as above and 20 channelization codes are assigned, the total transmission rate is 80 (transmission rate for one symbol per channelization code) * 3 (one symbol). The number of bits that can be transmitted) * 20 (the number of channelization codes allocated to one user terminal at that time) = 4800 k bps, and if the size of the coding block is 3200 bits, the TTI of this coding block is one slot. As described above, the TTI is determined by three factors: the MCS level, the number of channelization codes, and the size of the coding block.The TTI is also changed because the MCS level and the number of channelization codes assigned to one user terminal change over time. There is a possibility of change. Considering that the smallest unit of time used for information transmission in the current UMTS system is a slot having a size of 0.667 msec, the size of the TTI will change in units of one slot. It should be noted that the period of information having periodicity is TTI, and since this information should be transmitted every 1 slot in some cases, a minimum TTI should be used as a common period. As described above, since the EQS information is transmitted through the DPDCH in the present invention, the EQS information should be transmitted as a signaling signal of a higher layer. In consideration of the fact that the entity to use the EQS information is the MAC HS-DSCH of the base station, the present invention makes and transmits the EQS information as a MAC protocol data unit (PDU).

2 illustrates a process of feeding back the above control information according to the present invention.

Referring to FIG. 2, when referring to FIG. 2, when a base station transmits high-speed packet data having one slot of TTI through an HS DSCH, the subscriber station has one slot of TTI through the downlink channel. The data will be received. Meanwhile, the subscriber station transmits feedback information on the received data through an uplink channel to a slot after receiving the data. At this time, the feedback information is sent for one slot equal to the length of the TTI of the received data. On the other hand, when the base station transmits the high-speed packet data having the TTI of 3 slots through the downlink channel through the HS_DSCH, the subscriber station receives the data of the 3 slots of the TTI. The subscriber station transmits feedback information on the received data through uplink channel for three slots from the next slot after receiving the data. That is, in the above feedback operation, downlink data transmission and uplink data transmission are performed in the same length as the TTI according to various lengths of TTI. In this case, when the TTI is larger than the minimum TTI, multiple transmission of the same information occurs as shown in FIG. 3. In addition to the above operation, in the present invention, the uplink feedback information may be transmitted only once in a minimum TTI unit even if the TTI is changed.

Referring to FIG. 3, a method of fixing the transmission length of the feedback information information is performed in the same manner as the operation shown in FIG. 2 when the TTI is one slot. However, when the TTI for data transmission on the downlink channel is 3 slots, when the terminal user receives the downlink data, feedback is performed within 3 slots, such as the TTI for data transmission on the uplink channel, from the next slot at the start of reception. Feedback information is transmitted only for one slot in the section. On the other hand, the existing dedicated control channel DPCCH operates in the same manner as the conventional operation.

4 shows six examples of up-channel configuration of the HS-DPCCH. The feedback information structure 1 is used, and 6 bits are allocated to the CQI information, 1 bit is allocated to the ACK / NACK information, and 3 bits are allocated to the BCI information, and the HS-DPCCH uses the diffusion coefficient 64. (10,6) block coding for CQI information, (10,1) block coding for ACK / NACK information, and (20,3) block coding for BCI information. In this case, as shown in the lower part of FIG. 4, 640 chips are allocated to CQI, 640 chips to ACK / NACK, and 1280 chips to BCI. In this example, the most powerful block coding is used for ACK / NACK information. If the BCI information is the most important information, the transmission power can be increased for the 1280 chip allocated to the BCI.

5 illustrates a case where code multiplexing of feedback information is performed. The spreading factor of the code used for each feedback information may be different. In the upper part of FIG. 5, it is assumed that the CQI and the ACK / NACK are transmitted with the spreading factor 256, and the BCI is transmitted with the channel code having the spreading factor 128. In FIG. 5, if the bits allocated to each information are the same, CQI is transmitted through the first HS-DPCCH having a spreading factor of 256, and ACK / By the second HS-DPCCH having the same spreading coefficient. NACK signal is transmitted. BCI is transmitted through the third HS-DPCCH having the diffusion coefficient of 128. The advantage of using the method of FIG. 5 is that the respective feedback information can be transmitted more reliably than time division, thereby reducing performance degradation of the entire communication system using HSDPA due to an error in interpretation of the feedback information. Can be. 5 shows an example of spreading using one code for ACK / NACK and one code for BCI and CQI. Of course, other combinations are possible, and when the code division and time division are used together, there is an advantage that the reliability of each information can be efficiently adjusted by applying different transmission power to information using different codes.

4 and 5 illustrate a method of configuring uplink dedicated physical control channels for one or more HSDPAs by using separate channelization codes for HSDPA as described above. In this case, as shown in FIG. 15, since control information for a dedicated physical channel is always transmitted in a slot structure that can be received by a base station that does not support HSDPA, whether the HSDPA terminal communicates with a base station that does not support HSDPA. Regardless, the slot structure of the uplink-specific physical control channel does not need to be changed. In FIG. 15, n denotes the number of uplink dedicated physical control channels for HSDPA.

Meanwhile, when the HSDPA terminal does not communicate with a base station that does not support HSDPA, as shown in FIGS. 10 and 11, control information for uplink dedicated channel and control information for HSDPA are transmitted through one uplink dedicated physical control channel. Even if you do not have compatibility problems. With this in mind, when the HSDPA terminal does not communicate with a base station that does not support HSDPA, one uplink dedicated physical control channel is used, and when communicating with a base station that does not support HSDPA (for example, the HSDPA terminal is Only when located in a SHO including a base station that does not support HSDPA), an uplink dedicated physical channel (Secondary DPCCH) for HSDPA and an uplink dedicated physical channel that can be received by a base station not supporting HSDPA are provided. 12, 13, and 14 show an example of separately assigning a separate channelization code to an uplink dedicated physical control channel (Primary DPCCH, hereinafter called P-DPCCH).

12, 13, and 14 assume that a single S-DPCCH is operated for HSDPA, but the same method may be used when there are n uplink dedicated physical control channels for HSDPA. 12, 13, and 14 specify a channelization code used in each uplink-specific physical control channel. A method of indicating a channelization code will be briefly described as follows. In general, orthogonal variable spreading factor (OVSF) codes used as channelization codes have SF orthogonal codes having a spreading ratio of SF. Each code is expressed as C _{ch, SF, 0} to C _{ch, SF, SF-1} . . 12, 13, and 14, the P-DPCCH uses C _{ch, 256,0} as a channelization code to enable reception at a base station that does not support HSDPA.

In FIG. 12, when the HSDPA terminal does not communicate with a base station that does not support HSDPA, a single uplink physical control channel is configured and operated using C _{ch, 128,0} as a channelization code, and supports HSDPA base station and HSDPA. When communicating with a base station that does not have a channel number, C _{ch, 256,1} and C _{ch, 256,0} are assigned to the S-DPCCH for HSDPA and the P-DPCCH for a dedicated physical channel, respectively.

In FIG. 13, when the HSDPA terminal does not communicate with a base station that does not support HSDPA, a single uplink physical control channel is configured and operated using C _{ch, 128,1} as a channelization code, and supports HSDPA base station and HSDPA. When communicating with a base station that does not have an example of assigning C _{ch, 128,1} and C _{ch, 256,0} as channelization codes to S-DPCCH for HSDPA and P-DPCCH for dedicated physical channel, respectively, It is showing. In this case, by using C _{ch, 128,1} and C _{ch, 256,0} as channelization codes, orthogonality between two dedicated physical control channels can be guaranteed. In addition, the HSDPA base station does not need to change a channelization code for receiving control information for HSDPA, but only a slot structure.

In FIG. 14, when the HSDPA terminal does not communicate with a base station that does not support HSDPA, a single uplink physical control channel is configured and operated using C _{ch, 128,1} as a channelization code, and supports HSDPA base station and HSDPA. When the base station and not even to a communication that is used to assign a C _{ch, 128,1} and C _{ch, 256,0,} respectively as S-DPCCH and the P-DPCCH channelization codes for the dedicated physical channels for HSDPA. In this case, the S-DPCCH shows an example of maintaining the slot structure and SF before starting communication with the base station that does not support HSDPA. In this case, by using C _{ch, 128,1} and C _{ch, 256,0} as channelization codes, orthogonality between two dedicated physical control channels can be guaranteed. In addition, the HSDPA base station can receive the control information for the dedicated physical channel and HSDPA without any change.

The EQS information transmission through the DPDCH proposed by the present invention will be described with reference to the second embodiment and FIG. 6 as follows.

In the second embodiment, it is assumed that the user terminal is located in the soft handover region of the base station 1 and the base station 2. The user terminal communicates with the base station 1 at any point in time T1, and determines that the base station 2 provides a better channel than the base station 1 by measuring the channel quality of the adjacent cells. The user terminal designates base station 2 in BCI while sending feedback information for transmission 11 in T1`, and transmits EQS information through DPDCH in T2 ''. Since the base station 2 can receive the HS-DPCCH of the user terminal 1, it confirms at T2` that the optimal cell of the user terminal has been changed to itself, receives the DPDCH information from T2, and uploads it to the MAC HS-DSCH. The MAC HS-DSCH receives the EQS information, checks the reception buffer status of the user terminal, determines the data to be transmitted next, and starts transmission at T5.

An example of a hardware structure diagram of the terminal transmitter and the base station receiver according to the present invention is shown in FIGS. 7 and 8. 7 and 8 are hardware structure diagrams in which a terminal further uses one uplink channel code to transmit control information for HSDPA among several embodiments of the present invention.

FIG. 7 is a diagram illustrating a structure of a transmitter of a terminal for transmitting an uplink-oriented physical channel, which is an uplink transmission channel transmitted from a terminal to a base station. The uplink dedicated physical channel includes an uplink dedicated physical data channel (hereinafter, referred to as UL_DPDCH) for transmitting user information and signaling information of a higher layer, and an uplink dedicated physical control channel for transmitting control information of a physical channel ( Uplink Dedicated Physical Control Channel (hereinafter referred to as UL_DPCCH). In the present invention, it is assumed that EQS information is transmitted through DPDCH as well as user data. In FIG. 7, the user data and EQS 701 is transmitted to UL_DPDCH, inputted to encoder 702, channel coded to convolutional code or turbo code, input to 703 rate matcher, and processed through symbol puncturing, symbol repetition, and interleaving. It is made in a form suitable for transmission. The data generated by the rate matcher is input to the 704 spreader, and multiplied by the channel code to spread the UL_DPDCH. The channel code is an orthogonal code, and the length of the code is determined according to a spreading factor (hereinafter referred to as SF). The length of the channel code is 256 to 4 per symbol, and the smaller the spreading rate of the channel code is, the higher the data rate is. The user data spread in the 704 spreader is multiplied by the channel gain in multiplier 705. The channel gain is a parameter for determining the transmission power of the UL_DPDCH. In general, when the spreading rate is small, a large value is multiplied, and the value varies depending on the type of user data to be transmitted. The UL_DPDCH multiplied by the channel gain in the multiplier 705 of FIG. 7 is input to the summer 706 and summed with the UL_DPCCH.

711 Downward Power Control Command (hereinafter referred to as TPC), 712 Pilot, 713 Transmission Format Combination Indicator (hereinafter referred to as TFCI), and 714 Feedback Information (hereinafter referred to as TFCI). FBI) is an element constituting UL_DPCCH and is multiplexed in multiplexer 715 to constitute UL_DPCCH. The 711 TPC is a command transmitted to control the transmission power of the downlink transmission channel from the base station to the terminal, and the pilot 712 is used to estimate the channel environment from the terminal to the base station at the base station and use it for channel estimation of the received signal from the terminal. Is sent to ensure that 713 TFCI is an indicator indicating the data rate and the combination of transmission of various types of user data, for example, voice information and packet information, when UL_DPDCH is simultaneously transmitted. The TFCI enables the base station to correctly interpret the UL_DPDCH. do. 714 Feedback information is SSDT (Site Selection Diversity), which is used when a base station and a terminal transmit / receive in order to reduce the antenna gain of closed loop transmit antenna diversity or the size of interference signal in soft handover area. Refer to feedback information for.

The UL_DPCCH multiplexed at 715 is spread to the channel code of UL_DPCCH at spreader 716, multiplied by the channel gain for transmit power of UL_DPCCH at multiplier 717, and then multiplied by complex j at 718 multiplier. The reason why the complex j is multiplied by UL_DPCCH in the 718 multiplier is that the UL_DPCCH multiplied by the complex j and the UL_DPDCH are divided into an imaginary side and a real side. This is because the PAR (Peak to Average Ratio: hereinafter referred to as PTAR) can be reduced in the terminal transmitter due to the reduction of. In general, when zero crossing occurs in a constellation diagram on a radio frequency, a PAR becomes large, and it is widely known that the increased PAR adversely affects a transmitter of a terminal. The imaginary UL_DPCCH in the multiplier 718 is input to the summer 706, and is combined with the UL_DPDCH input in the multiplier 705, but the properties are not changed because they are real and imaginary addition.

The multiplexer 724 of FIG. 7 receives and multiplexes control information for supporting HSDPA as an input. Inputs of the multiplexer 724 include 721 ACK / NACK (Acknowledgement / Not Acknowledgement: ACK / NACK), 722 BCI (Best Cell Indicator: hereinafter BCI), 723 CQI (Channel Quality Indicator: CQI). And, the role of the ACK / NACK, BCI, CQI is described in detail in Figures 4, 5, 6 of the present invention. The new uplink dedicated physical channel generated by the multiplexer 724 of FIG. 7 is referred to as a secondary uplink dedicated physical control channel (hereinafter referred to as S-UL_DPCCH) for convenience of description of the present invention. The UL_DPCCH generated by the multiplexer 715 of 7 is called a primary uplink dedicated physical control channel (hereinafter referred to as P-UL_DPCCH). The S-UL_DPCCH in FIG. 7 includes only information for controlling HSDPA, which receives data in which a minimum transmission unit (TTI) may be 1 slot, 3 slots, 5 slots, 10 slots, or 15 slots. Send a control signal to be returned in relation to the data signal. P-UL_DPCCH consists of information for controlling the downlink channel from the base station to the terminal, which transmits a control signal for the downlink channel having a minimum transmission unit (TTI) of 15 slots or more. The S-UL_DPCCH output from the multiplexer 724 is input to the spreader 725 and spread to the spreading code for the S-UL_DPCCH. The multiplier 726 multiplies the channel gain for the transmit power of the S-UL_DPCCH and inputs to the summer 706. Sum with UL_DPDCH and P-UL_DPCCH. As described above, P-UL_DPCCH is a imaginary value multiplied by a complex number j. Therefore, even when combined with S-UL_DPCCH, the characteristics of each UL_DPCCH are not lost, and since UL_DPDCH and S-UL_DPCCH are each spread with different channel codes, the receiver is inverse. When spreading, there is no mutual effect. Unlike the P-UL_DPCCH, the reason why the S-UL_DPCCH is combined with the UL_DPDCH and transmitted through the I channel and the P-UL_DPCCH through the Q channel is not transmitted when there is no user information or higher layer signaling on the UL_DPDCH transmitted to the real side. This is because it is a channel. If the UL_DPDCH is not transmitted, if both UL-DPCCHs are transmitted to the imaginary side, since the frequency of zero crossing increases, the PAR of the terminal transmitter may increase, thereby transmitting the S-UL_DPCCH by mistake. To reduce the PAR as much as possible.

The UL_DPDCH, P-UL_DPCCH, and S-UL_DPDCH summed up in the summer 706 of FIG. 7 are mixed in complex form by multiplying the uplink scrambling code used in the terminal in the multiplier 707 by I + J and then inputting the modulator 708 to modulate it. Then, it is converted to a carrier frequency in the 709 RF unit and transmitted to the base station through the antenna 710. The uplink scrambling code used in the multiplier 707 is a code used to distinguish terminals in UMTS and is a complex code generated from a gold code. The uplink scrambling code used in the multiplier 707 is used again for demixing at the base station receiving the signal transmitted by the terminal.

FIG. 7 illustrates a structure of a terminal transmitter for the embodiment shown in FIG. 4 among various embodiments of the present invention, and when the embodiments of FIGS. 5 and 6 are used, 721 ACK / NACK, 722 BCI, The 723 CQIs may be spread and transmitted with different channel codes, and channel gains may also use different values. When the embodiments of FIGS. 5 and 6 are used, the number of the spreaders used for spreading is added in the terminal transmitter. In addition, when 721 ACK / NACK, 722 BCI, and 723 CQI of FIG. 7 are transmitted using different channel codes, transmission of the channels to the real side and the imaginary side may be performed in various combinations. As an example of the combination, ACK / NACK may be transmitted to the real side, and BCI and CQI may be transmitted to the imaginary side.

8 is a diagram illustrating a hardware structure of the base station receiver according to FIG. 7. The signal of the terminal received through the base station antenna 801 of FIG. 8 is converted into a baseband RF signal through the RF unit 802, demodulated by a demodulator 803, multiplied by a scrambling code by a multiplier 804, and demixed. The scrambling code used in the multiplier 804 is the same scrambling code used in the multiplier 707 among the terminal transmitters of FIG. 7 and is transmitted by a terminal different from the signal transmitted at the time of transmission of the terminal of FIG. It distinguishes between signals.

The signal output from the 804 multiplier of FIG. 8 is input to the despreaders 805, 806, and 807 to be despread. The demixing and despreading are described separately but can be performed simultaneously. The channel code used by the despreader 805 is the same as the channel code used by the spreader 704 of FIG. 7, and the channel code used by the despreader 806 is the same as the channel code used by the spreader 716 of FIG. 7. The channel code used in the despreader 807 is the same as the channel code used in the spreader 725 of FIG. 7. As described with reference to FIG. 7, since the channel code is an orthogonal code, signals despread by the despreaders 805, 806, and 807 are classified into UL_DPDCH, P-UL_DCCH, and S-UL_DPCCH. The P-UL_DPCCH despread in FIG. 806 is multiplied by -j in the multiplier 811 to restore a real signal. The reason why -j is multiplied is to make P-UL_DPCCH, which is multiplied by j in multiplier 718 of FIG. 7, to become an imaginary signal. The P_UL-DPCCH which becomes the real signal is input to the demultiplexer 819 and the multiplier 812. The demultiplexer 819 distinguishes only the pilot signal 814 from the P_UL-DPCCH and inputs it to the channel estimator 818. The pilot signal 814 inputted to the channel estimator 818 is used as data for estimating the channel environment from the terminal to the base station, and a compensation value for the estimated channel environment is calculated by the channel estimator 818 so that the multiplier 812, multiplier 808, multiplier 821 Is entered. The P-UL_DPCCH output from the multiplier 811 is input to the multiplier 812 and multiplied by a channel estimate value, which is a compensation value for the channel environment, calculated by the channel estimator 818, to the demultiplexer 813. The demultiplexer 813 demultiplexes the TPCs 815, TFCI 816, and FBI 817 except for the pilot 711 among the P-UL_DPCCHs of FIG. 7, the TPC 815 controls downlink transmission power, the TFCI is used to interpret the uplink UL_DPDCH, and the FBI is Used for gain adjustment of SSD transmit antennas or SSDT.

The signal output from the multiplier 804 of FIG. 8 is despread in the 805 despreader and restored to a signal of UL_DPDCH. In the 805 despreader, signals other than UL_DPDCH are lost. The reconstructed UL_DPDCH signal is multiplied by the channel estimate in the multiplier 808, and then decoded according to the channel code used in the decoder 809, that is, the convolutional code or the turbo code, to be transmitted as a user information or a signaling signal of a higher layer and transmitted to a higher layer.

The signal output from the multiplier 804 of FIG. 8 is despread to the 807 despreader and restored to the signal of S-UL_DPCCH. In the 807 despreader, signals other than S-UL_DPCCH are lost. The S-UL_DPCCH reconstructed by the despreader 807 is multiplied by the channel estimate value output from the channel estimator 818 in the multiplier 821 and then input to the demultiplexer 822 after channel compensation. In the demultiplexer 822, the S-UL_DPCCH is demultiplexed into ACK / NACK 823, BCI 824, and CQI 825 and used for each purpose. The purpose and use of the ACK / NACK 823, BCI 824, CQI 825 is described in detail in the description of Figures 3, 4, 5, 6 of the present invention.

The hardware structure diagram of the base station receiver of FIG. 8 is an example of FIG. 4 of the present invention, and when the embodiment of the present invention of FIGS. 5 and 6 is used, the number of despreaders in FIG. 8 is used in the terminal. There must be as many as.

17 to 21 show examples of a configuration of a forward dedicated physical channel according to the present invention for simultaneously supporting data transmission through an HSDPA service through a HS-DSCH channel and a forward dedicated physical data channel.

17 illustrates an example of configuring one forward dedicated physical channel for HSDPA. The Data1, TPC, TFCI, Data2, and Pilot fields play a role defined in the RELEASE 99 standard as described in FIG. On the other hand, the HS-DSCH indicator (indicator) informs the UE of the presence of the HSDPA data packet to be received. At this time, it is necessary to transmit the HS-DSCH indicator included in the forward dedicated physical channel signal without transmitting a separate code channel. In addition, the base station informs the specific UE of the existence of the HSDPA data packet on the HS-DSCH indicator through a forward dedicated physical channel, and then the common UE for the HS-DSCH including information necessary for receiving the HS-DSCH signal. It transmits a shared control channel (hereinafter referred to as SHCCH). The common control channel signal (hereinafter referred to as HS-DSCH control information) includes an MCS level, an HS-DSCH channelization code, an HARQ process number, and an HARQ packet number. In this case, one or more channelization codes may be allocated to the SHCCH. According to the present invention, the HS-DSCH control information is additionally transmitted to the HS-DSCH indicator position in FIG. 17. That is, in addition to the HS-DSCH indicator, some of the HS-DSCH control information may be additionally transmitted using the forward dedicated physical channel in FIG. 17. The HS-DSCH indicator transmitted on the forward dedicated physical channel may indicate not only the presence of the HSDPA data packet but also the channelization code of the SHCCH channel to receive the HS-DSCH control information when the HSDPA data packet exists. The channelization code of the SHCCH channel may be determined at the time of call setup. In addition, if necessary, some of the HS-DSCH control information, for example, an MCS level may also be transmitted through the HS-DSCH indicator. When the HSDPA data packet is transmitted in units of N slots (i.e., HSDPA TTI = N slots), when the slot structure is fixed in the TTI as shown in FIG. 17, the HS-DSCH indicator is assigned to N slots. Bits indicating the presence or absence of HSDPA data packets are repeatedly transmitted in N slots. On the other hand, by transmitting the HS-DSCH indicator to only one specific slot in the TTI may ensure a sufficient processing time to the terminal. In this case, as shown in FIG. 21, the slot structure may change within the TTI. 21 shows that some slots are used as slots for transmitting the HS-DSCH indicator and the remaining slots have an existing slot configuration. 21, there is no Data1 field and Data2 field in the slot for transmitting the HS-DSCH indicator. This is to transmit the HS-DSCH indicator in one slot by allocating enough bits to the HS-DSCH indicator. As shown in FIG. 21, the slot structure can be changed in the TTI, thereby more efficiently the system in transmitting data (Data1, Data2 field) for service through the HS-DSCH indicator and the dedicated physical channel. It can be operated.

20 shows an HSDPA base station transmitting a forward dedicated physical channel in a slot structure as shown in FIG. 17 and a terminal device receiving a forward signal from a base station not supporting HSDPA transmitting a forward dedicated physical channel in a slot structure as shown in FIG. have. As shown in FIG. 20, when the base station that does not support the HSDPA base station and the HSDPA simultaneously transmits the same data through the Data1 field and the Data2 field of the forward dedicated physical channel to the terminal, the base station that does not support the HSDPA is SF = N If using an in-channelization code, in order to transmit the same data, an HSDPA base station that must also transmit an HS-DSCH indicator should use a channelization code with SF less than N (e.g. SF = N / m). do. In this situation, the UE operates the signal 2001 of SF = N / m coming from the HSDPA base station and the signal 2003 of SF = N coming from the base station not supporting HSDPA at SF = N / m for the HSDPA base station, respectively. It should be received with Finger 2017 and Finger 2017 operating with SF = N for base stations that do not support HSDPA. The output signal of the finger 2005 for the HSDPA base station is a signal 2009 (Data1, TPC, TFCI, Data2, Pilot) having the same information as the signal transmitted from the HS-DSCH indicator (2011) and the base station not supporting HSDPA by the demultiplexer 2007. Separated by). The outputs 2019 (Data1, TPC, TFCI, Data2, Pilot) of the finger 2017 for the base station not supporting the HSDPA are combined by the 2009 signal and a radio link combiner 2013. The wireless path combiner 2013 outputs information 2015 such as Data1, TPC, TFCI, and Data2. In this case, a pilot signal is used by the radio path combiner 2013 to estimate a down channel from an HSDPA base station and a down channel from a base station not supporting HSDPA for radio path combining.

In FIG. 18, two forward dedicated physical channels, a primary DPCH (hereinafter referred to as P-DPCH) and a secondary DPCH, are allocated to a channel for transmitting an HS-DSCH indicator to a UE for HSDPA service, separately from an existing dedicated physical channel. The following shows a channel structure for allocating S-DPCH. In this case, since S-DPCH for transmitting the HS-DSCH indicator differs from the P-DPCH in the amount of information to be transmitted, SF = N is assigned to the P-DPCH and SF = M is assigned to the S-DPCH as shown in FIG. can do. When the amount of information of the HS-DSCH indicator to be transmitted in every slot is small, a significantly large value such as M = 512 can be assigned to the S-DPCH to increase the efficiency of using the forward channelization code. In addition, since the configuration field of the P-DPCH is the same as the forward dedicated physical channel transmitted by the base station not supporting HSDPA, the slot structure of the P-DPCH is the same as the slot structure of the dedicated physical channel transmitted by the base station not supporting HSDPA. do. That is, the slot structure of the P-DPCH maintains the structure defined in the RELEASE 99 standard. The S-DPCH transmits information necessary for transmitting the HS-DSCH indicator or for receiving high-speed packet data transmitted through the HS-DSCH indicator and the HS-DSCH. In this case, the UE may use the same structure for the finger for the P-DPCH transmitted from the HSDPA base station and the finger for the DPCH transmitted from the base station that does not support HSDPA. In the present invention, as in FIG. 17, the HS-DSCH control information is not excluded from the HS-DSCH indicator position in FIG. 18. That is, in addition to the HS-DSCH indicator, some of the HS-DSCH control information may be additionally transmitted using the S-DPCH in FIG. 18.

In FIG. 18, when the information to be added to the HS-DSCH indicator is information for indicating whether the HSDPA data packet should be received to the UE, the amount of information may be very small. In this case, information of several terminals may be sent using a single S-DPCH. Such a channel is called a common indicator channel (COMMON HS-DSCH INDICATOR CHANNEL; CHICH).

31 to 33 are diagrams illustrating a case where several UEs share a CHICH as described above. 3102 and 3103 of FIGS. 31 to 33 illustrate DL DPCHs of different UEs. Each DL DPCH may be transmitted with a different timing, and thus may have a time difference from the SHCCH as shown in FIG. 31. Here, it may be assumed that the SHCCH is synchronized with the CPICH. In FIG. 32, the CHICH transmitting HSDPA indicators for UE 1 and UE 2 in FIG. 33 may be synchronized with SHCCH (3101 of FIG. 31). Therefore, in this case, the CHICH and the DL DPCH of each UE may be shifted out of synchronization, and a corresponding synchronization difference may be known to each UE through higher signal information in advance.

34 shows an example of the structure of the CHICH. The CHICH transmits HS-DSCH indicators of several UEs, and as shown in 3401 of FIG. 34, each UE may receive corresponding information at a time-divided location. For example, if the SF of the CHICH is 512, the total number of physical channel bits in one slot is 10 bits, and the number of bits allocated to each UE is 2 bits. Likewise, 10 bits can be allocated to each of 2 bits. The location of each UE is determined when the UE sets up the HS-DSCH channel and is known to the UE. Therefore, at the end of the HS-DSCH service, the right to use a corresponding bit is lost, and after that, the base station may allocate the corresponding bit to another UE. Accordingly, the number of CHICH is determined according to the number of UEs currently receiving HS-DSCH service. That is, as in the above example, when 10 UEs share one CHICH, when the number of UEs receiving HS-DSCH service is 0-10, when 1 CHICH is 11-20, two CHICHs are required.

However, if the TTI is not 1 or more, that is, if the TTI is 3, 5, or 15, the information that could be allocated to 10 UEs in each slot will be allocated to more UEs. Can be. For example, when the TTI is 3 and an indicator is transmitted to each UE once for each TTI, the indicator may be transmitted to up to 30 UEs. Therefore, one CHICH may be used for 0-30 UEs.

In FIG. 34, each HS-DSCH indicator information is transmitted for each UE. Therefore, a power value of each HS-DSCH indicator may be set differently for each corresponding terminal. The power level of the HS-DSCH indicator bits allocated to each UE may be determined according to the power level of the DL DPCH of the corresponding UE. That is, it may be determined as a value relative to the pilot bit of the corresponding DL DPCH or the power value of the TPC of the corresponding DL DPCH or the DPDCH of the DL DPCH. The relative value may be predetermined during channel setup. However, when the terminal is located in the handover area, the power value of the DL DPCH may not be appropriate. The reason is that the terminal performs DL power control so that the combined power value of the DL DPCHs received from several cells is appropriate, so that the power of the DL DPCHs received from individual cells is not appropriate. You may not. In this case, that is, when the terminal is in the handover region, the power value of the HS-DSCH indicator for the corresponding terminal in the CHICH set based on an inappropriate DL DPCH power level may not be appropriate. Therefore, a special power offset value may be set in consideration of the case where the terminal is in handover. The power offset value may be pre-assigned during channel setup or may be transmitted periodically or when needed by the control station in consideration of the handover situation.

If the TTI is larger than 1 slot, i.e., if the TTI is 3 slots or 5 slots or 15 slots, then assign to each UE for an HS-DSCH indicator The number of bits to be used may be given for each slot or may be given once for the TTI. The HS-DSCH indicator for each UE is advantageously assigned to one slot of the TTI in order to minimize delay. FIG. 33 is a diagram illustrating a time relationship between a time for transmitting an HS-DSCH indicator and a time for transmitting a SHCCH 3304 in the CHICH 3303. In FIG. 33, it is assumed that the TTI is 3. The HS-DSCH indicator must arrive before receiving the SHCCH. In addition, since each UE needs time to recognize the HS-DSCH indicator, a Toff 3301 delay is required as shown in the figure. The Toff delay value has a value greater than or equal to zero. In FIG. 33, the Tind time value 3302 indicates a period during which the base station transmits an HS-DSCH indicator. An interval for transmitting the HS-DSCH indicator is defined as one slot or more and is defined as an HS-DSCH indicator transmission interval. The HS-DSCH indicator transmission period may be a multiple of one slot and a multiple of 256 chips as necessary. In order to transmit the HS-DSCH indicator, the base station must finish scheduling the corresponding SHCCH transmission period before Toff + Tind time before the corresponding SHCCH transmission period. Therefore, the greater the Tind value, the greater the scheduling delay. Therefore, the Tind value may be determined according to the requirements of the base station and the UE. When the Tind value is 1 slot, the SF of the CHICH is 512 and the number of bits for each HS-DSCH indicator is 2 bits. bit), one CHICH can transmit an indicator to a total of 10 UEs. Meanwhile, when the tind value is 3 slots and the number of bits for the HS-DSCH indicator is 2 bits, the indicator may be transmitted to a total of 30 UEs using one CHICH. Therefore, there is a trade off between the number and delay of UEs to be delivered using one CHICH. Therefore, the Tind value should be determined in consideration of the above various conditions.

If the TTI is not one slot and the Tind value is one slot, an unused slot in the TTI may occur. These slots may be used by groups using different HS-DSCHs. That is, if the HS-DSCH use group exists separately from the currently used code group, the HS-DSCH use group may also need one CHICH. The CHICH of another HS-DSCH use group may use an unused slot of the existing CHICH by shifting the SHCCH time of another HS-DSCH use group by one slot. Therefore, downlink code can be usefully used through sharing among different HS-DSCH use groups.

In the 3GPP R-99 standard, a portion of the TFCI field is used to transmit a TFCI for a forward dedicated physical data channel (DPDCH) as shown in FIG. 19 by dividing the TFCI field, and the other part transmits a TFCI for a forward DSCH channel. It defines the method used to do this. Meanwhile, in the case of the HSDPA base station, if the HSDPA data packet is transmitted to the UE through the HS-DSCH, the packet service is not performed through the DSCH channel defined in R-99. Therefore, as shown in FIG. 19 to support the HSDPA service, the TFCI field is divided into R-99 as defined in the R-99 standard while maintaining the forward DPCH channel structure that does not support the existing HSDPA. The part allocated for the DPDCH in the standard is used for the forward DPDCH. In the R-99 standard, a part of the TFCI field allocated for the DSCH among the TFCI fields may be used to transmit the HS-DSCH indicator. When the DPCH having the slot structure as shown in FIG. 19 is transmitted from the HSDPA base station, the base station not supporting the HSDPA may enable the radio path combining at the terminal side by transmitting the DPCH in the same slot structure. However, the base station that does not support HSDPA processes the portion of the HSDPA base station to transmit the HS-DSCH indicator to the DTX.

22 and 23, the HS-DSCH indicator and Data1, TPC, TFCI, Data2, and Pilot as defined in R-99 are transmitted through one forward dedicated physical channel as shown in FIGS. 17, 19, and 21. If so, the base station transmitter and terminal receiver devices are shown.

First, FIG. 22 will be described. The data 2201 to be transmitted through the dedicated physical channel is channel coded by the encoder 2203 and rate matched by the number of bits to be transmitted in the physical channel by the rate matching unit 2204. The output of the rate matching unit 2204, the HS-DSCH indicator 2205, the TFCI 2207, the pilot 2209, and the TPC 2211 are applied to the multiplexer 2213 and output as one bit stream. The bit stream is transformed into two bit streams by 2215 and the spreader 2219 spreads the two bit streams using the same channelization code to be orthogonal to signals using different channelization codes. In this case, the two bit streams I and Q signals of the spreader output are output as one complex stream by the multiplier 2220 and the adder 2251. The complex stream output is multiplied by a complex mixed code on a chip-by-chip basis by the mixer 2223 to distinguish it from a signal using another mixed code. The output of the mixer 2223 is again multiplied by the channel gain by the multiplier 2227. Meanwhile, FIG. 22 also shows a transmitter for the SHCCH. The HS-DSCH control information 2214 is converted into two bit streams by 2217 and spread by the spreader 2221, and then by two 2222 and 2253. The bit stream is converted into one complex stream. The complex output of 2253 is multiplied on a chip-by-chip complex mixed code by the mixer 2225, and then multiplied by the channel gain on the multiplier 2229. The forward dedicated physical channel output of 2227 and the SHCCH output of 2229 are added at summer 2231, modulated at modulator 2233, converted to RF band signal at RF section 2235, and transmitted via antenna 2237. In FIG. 22, it is assumed that the forward dedicated physical channel and the SHCCH are mixed by different mixing codes. However, a method and an apparatus for transmitting the two channels using the same mixing code and using different channelization codes are also possible.

FIG. 23 illustrates a receiver of a terminal for receiving a signal transmitted to the base station transmitter as shown in FIG. The RF band signal received by the antenna 2320 is converted into a baseband signal by the RF unit 2319, demodulated by the demodulator 2318 and then applied to two demixers 2313 and 2316. A forward dedicated physical channel signal is output from the demixer 2313, and a SHCCH channel signal is output from the demixer 2316. The complex output of 2313 is separated into a real signal I and an imaginary signal Q by 2312. The I and Q signals are despread by multiplying the channelization codes in the despreader 2311. In addition, the output I and Q signals of the 2317 are despread by multiplying the channelization codes in the despreader 2321. The I and Q output signals of the despreader 2311 are applied to the demultiplexer 2314 so that the demultiplexer 2314 outputs a pilot signal. The pilot signal is applied to the channel estimator 2341 to apply channel estimation values through distortion estimation by the wireless channel to the channel compensators 2310 and 2322. The channel compensators 2310 and 2322 compensate for the distortion caused by the wireless channel using the channel estimate. The channel compensator 2310 outputs data of a dedicated physical channel as two bit streams, and the channel compensator 2322 outputs data of a SHCCH channel as two bit streams. The 2323 converts the HSCCH channel data applied to the two bit streams into one bit stream and finally outputs the HS-DSCH control information 2324. The 2309 converts the data of the dedicated physical channel applied to the two bit streams into one bit stream, and the output bit stream of the 2309 is demultiplexed by the demultiplexer 2308, the TPC 2307, the Pilot 2306, and the TFCI 2305. ), The HS-DSCH indicator 2304 is output. The demultiplexer 2308 also outputs a downlink data signal. The downlink data signal is channel-decoded by the decoder 2302 to output the downlink data 2301. In FIG. 23, it is assumed that a wireless channel is estimated using a pilot transmitted through a dedicated physical channel. However, it is also possible to estimate a munition channel using a pilot transmitted through a shared channel.

In FIG. 24 and FIG. 25, as shown in FIG. 18, one dedicated physical channel Secondary DPCH (hereinafter referred to as S-DPCH) is allocated to the HS-DSCH indicator by using a separate channelization code, and as defined in R-99. In case of being transmitted on one forward dedicated physical channel Primary DPCH (hereinafter referred to as P-DPCH) having a slot structure not supporting HSDPA to the same Data1, TPC, TFCI, Data2, Pilot, etc., that is, operating two forward dedicated physical channels. In this case, the base station transmitter and the terminal receiver are shown.

First, FIG. 24 will be described. Data 2401 to be transmitted over the dedicated physical channel is channel coded by the encoder 2403 and rate matched by the number of bits to be transmitted in the physical channel by the rate matching unit 2404. The TFCI 2407, Pilot 2409, and TPC 2411 from the rate matching unit 2404 are applied to the multiplexer 2413 so that the multiplexer 2413 outputs one bit stream. The bit stream is transformed into two bit streams by 2415 and the spreader 2419 spreads the two bit streams using the same channelization code to be orthogonal to signals using different channelization codes. The two bit streams of the I and Q signals are output as one complex stream by the multiplier 2420 and the adder 2455. On the other hand, the HS-DSCH indicator 2405 is converted into two bit streams by 2438, and then spread from the spreader 2439 to a channelization code different from the channelization code used in the spreader 2419 for the P-DPCH. Converted to a complex stream by 2440 and 2453. The P-DPCH signal output from the 2455 and the S-DPCH signal output from the 2453 are added by the adder 2451 and then mixed by the combiner 2441 and multiplied by the channel gain in the multiplier 2442. The SHCCH channel is channelized and mixed by the same device as in FIG. 22 above. The SHCCH channel signal output 2424 and the dedicated physical channel signal output 2442 are added in summer 2431, modulated by modulator 2433, converted into RF band signal by RF unit 2435, and transmitted by antenna 2437. do. In FIG. 24, as in FIG. 22, it is assumed that a forward dedicated physical channel and a SHCCH are mixed by different mixing codes. However, a method and apparatus for transmitting the two channels using the same mixing code and using different channelization codes are illustrated in FIG. It is also possible.

FIG. 25 illustrates a receiver of a terminal for receiving a signal transmitted from the base station transmitter as shown in FIG. The RF band signal received by the antenna 2555 is converted into a baseband signal by the RF unit 2553, demodulated by the demodulator 2551, and then applied to two demixers 2533 and 2549. The reverse mixer 2533 outputs a forward dedicated physical channel signal, and the inverse mixer 2549 outputs a SHCCH channel signal. The complex output of the 2533 is separated into a real signal I and an imaginary signal Q by 2531 and 2529, respectively. The output of 2531 is a P-DPCH signal, and the output of 2529 is an S-DPCH signal. The output of 2529 and the output of 2531 are despread by despreaders 2525 and 2527 respectively. The demultiplexer 2535 separates the pilot signal from the output signal of the 2527 and applies it to the channel estimator 2537, and the channel estimator 2537 calculates the channel estimate and provides the channel estimator 2521, 2523, and 2543. After the channel distortion is compensated by the channel compensator 2521, the output of the 2525 is converted into one bit stream by 2517, and finally, the HS-DSCH indicator information 2515 is output. On the other hand, the output of the 2527 is compensated for the channel distortion by the channel compensator 2523, and then converted into a single bit stream by the 2519, applied to the demultiplexer 2513, and finally the TPC 2511, Pilot 2509, and TFCI 2507 The downlink data signal of the demultiplexer output is again channel-decoded by the decoder 2503 to output the downlink data 2501. The output of the demixer 2549 is a SHCCH channel signal, which is recovered by the same apparatus as in FIG. 23 and finally, the HS-DSCH control information 2539 is output. In FIG. 25, it is assumed that a wireless channel is estimated using a pilot transmitted through a dedicated physical channel. However, it is also possible to estimate a munition channel using a pilot transmitted through a shared channel.

When some of the TFCI fields are used as HS-DSCH indicators, the number of bits of the HS-DSCH indicators that can be used in one slot may be 1 bit. However, if the HS-DSCH indicator is transmitted in 1 bit, the reliability of the HS-DSCH indicator may be greatly reduced. Accordingly, the 1-bit HS-DSCH indicator may be transmitted at high power by using a power offset. The power offset value may be applied differently depending on whether or not the terminal is in a handover region. That is, when the terminal is in the handover region, the power offset value may be larger than when the terminal is not in the handover region. The power offset value may be defined as a size relative to the power of a data field or a pilot field among DL DPCH fields. The power offset value may be transmitted to the Node B using a signaling message by the SRNC or the CRNC. In this case, the SRNC may determine a power offset value in consideration of the number of cells connected to the terminal. In addition, since the access cells existing in the same Node B can simultaneously transmit the HS-DSCH indicator to the terminal as the cell transmitting the HS-DSCH, the ratio of the access cells existing in the same Node B to the access cells that are not present is considered. The power offset value can be determined.

When transmitting the HS-DSCH indicator or the HS-DSCH control information on a dedicated channel, it may be insufficient to use only one bit in one slot as described above. The reason for this is that, first, the transmission of the HS-DSCH indicator by only one bit has a high risk of the indicator being lost. Second, when the HS-DSCH control information is transmitted in addition to the HS-DSCH indicator, more bits are required. Because it is necessary. In addition, the TFCI bit may not be defined, in which case it may be impossible to use the 1-bit TFCI bit.

Therefore, in addition to using a 1-bit TFCI bit in the forward dedicated channel, it may be necessary to use a bit for HS-DSCH indicator or control information, which will be described in detail with reference to the drawings.

16 shows a structure of a forward dedicated channel. The length values of each part of FIG. 16 defined in the 3GPP R-99 standard are shown in Table 1 below.

SlotFormat #i ChannelBit Rate (kbps) ChannelSymbolRate (kbps) SF Bits / Slot DPDCHBits / Slot DPCCHBits / Slot N _Data1 N _Data2 N _TCP N _TFCI N _pilot 0 15 7.5 512 10 0 4 2 0 4 One 15 7.5 512 10 0 2 2 2 4 2 30 15 256 20 2 14 2 0 2 3 30 15 256 20 2 12 2 2 2 4 30 15 256 20 2 12 2 0 4 5 30 15 256 20 2 10 2 2 4 6 30 15 256 20 2 8 2 0 8 7 30 15 256 20 2 6 2 2 8 8 60 30 128 40 6 28 2 0 4 9 60 30 128 40 6 26 2 2 4 0 60 30 128 40 6 24 2 0 8 11 60 30 128 40 6 22 2 2 8 12 120 60 64 80 12 48 4 8* 8 13 240 120 32 160 28 112 4 8* 8 14 480 240 16 320 56 232 8 8* 16 15 960 480 8 640 120 488 8 8* 16 16 1920 960 4 1280 248 1000 8 8* 16

As shown in Table 1, the values of each field are defined differently according to each spreading factor (SF). For example, for slot format # 3, the total number of bits in one slot is 20 bits, Ndata1 = 2 bits, Ndata2 = 12 bits, NTPC = 2 bits, NTFCI = 2 bits and Npilot = 2 bit. In the case of the slot format # 3, the base station may use one bit of the TFCI bits as a bit for the HS-DSCH as in the example shown in Table 1 above. Meanwhile, a bit that can be used as an additional bit may be a pilot bit. However, since the number of pilot bits is only 2 bits in the slot format # 3, when the 1 bit is used as the HS-DSCH, the number of pilot bits may be too small. Accordingly, the present invention describes a method of using pilot bits for the HS-DSCH for a slot format when the number of pilot bits is 4 or more. As described in Table 1, slot formats having a pilot bit number of 4 or more are all slot formats except slot format # 2 and slot format # 3.

Table 2 below shows pilot patterns for each slot for the number of pilot bits.

N _Pilot = 2 N _Pilot = 4 ( ^* 1) N _Pilot = 8 ( ^* 2) N _Pilot = 16 ( ^* 3) Symbol # 0 0 One 0 One 2 3 0 One 2 3 4 5 6 7 Slot # 0 11 11 11 11 11 11 10 11 11 11 10 11 11 11 10 One 00 11 00 11 00 11 10 11 00 11 10 11 11 11 00 2 01 11 01 11 01 11 01 11 01 11 01 11 10 11 00 3 00 11 00 11 00 11 00 11 00 11 00 11 01 11 10 4 10 11 10 11 10 11 01 11 10 11 01 11 11 11 11 5 11 11 11 11 11 11 10 11 11 11 10 11 01 11 01 6 11 11 11 11 11 11 00 11 11 11 00 11 10 11 11 7 10 11 10 11 10 11 00 11 10 11 00 11 10 11 00 8 01 11 01 11 01 11 10 11 01 11 10 11 00 11 11 9 11 11 11 11 11 11 11 11 11 11 11 11 00 11 11 10 01 11 01 11 01 11 01 11 01 11 01 11 11 11 10 11 10 11 10 11 10 11 11 11 10 11 11 11 00 11 10 12 10 11 10 11 10 11 00 11 10 11 00 11 01 11 01 13 00 11 00 11 00 11 11 11 00 11 11 11 00 11 00 14 00 11 00 11 00 11 11 11 00 11 11 11 10 11 01

As shown in Table 2, the pilot is transmitted in a predetermined pattern for each slot.

The present invention provides a method of using some of the pilot bits for the HS-DSCH. Slot format # 5 in Table 2 will be described as an example. In the case of Slot format # 5, the number of bits for TFCI is 2 bits, and the number of bits for pilot is 4 bits. Therefore, one bit of TFCI bits can be used for HS-DSCH, and one or two bits of four bits of pilot bits are additionally used. Can be used for HS-DSCH. In the present invention, for convenience of description, it is assumed that 2 bits of pilot bits are used for the HS-DSCH.

As described above, when 2 bits of pilot bits are used for the HS-DSCH in the slot format # 5, the bits for the HS-DSCH are 2 bits or TFCI in total. If bits are also used, they can be a total of 3 bits. When using a total of 2 bits (bit) or a total of 3 bits (bit) for the HS-DSCH, the amount of information that can be transferred can be a total of four or eight. When the bits are used as an HS-DSCH indicator, the following two examples may be used.

As a first example, when the total 2 bits or the total 3 bits are used as information for reading an HS-DSCH control channel.

In this case, there are two types of information: (1) read and (2) unread. Therefore, in this case, the total 2 bits or 3 bits can be used to send both information. In this case, the bits may use a method of repeatedly sending the same information. In other words, 11 or 00 is transmitted in the case of a total of 2 bits. In the case of 3 bits in total, 111 or 000 can be transmitted.

As a second example, the information for reading a total of 2 bits or a total of 3 bits for reading an HS-DSCH control channel and information about which control channel should be read are transmitted. Can be used.

In the case of a total of 2 bits, four types of information can be sent, 11, 10, 01, and 00, one of which indicates no reading, and an HS-DSCH control channel to be read using the remaining three. Can be represented. When the number of HS-DSCH control channels to be read is three or less, the HS-DSCH control channel and the information may have a preset relationship. In this case, the HS-DSCH control channel may not additionally include information about the UE. When the number of the HS-DSCH control channels is 4 or more, there are only three types that can be represented by the total 2 bits. In this case, the HS-DSCH control channels are grouped. It associates with the three types of bits in advance. In this case, information for identifying the UE should be additionally included in the HS-DSCH control channel.

Similarly, in the case of the total 3 bits, eight kinds of information such as 111, 110, 101, 100, 011, 010, 001, 000 can be transmitted. One of these is used as a command to read an HS-DSCH control channel, and the other may indicate a number of an HS-DSCH control channel. Therefore, when the number of HS-DSCH control channels is 7 or less, it is possible to have a relationship with seven of the eight kinds of information and the number of the HS-DSCH control channels. In this case, HS-DSCH control channel information may not need information identifying a terminal, that is, UE Id. On the other hand, when the number of HS-DSCH control channels is 8 or more, the seven types of the HS-DSCH control channels are made into 7 or less groups as in the case of the total 2 bits. Map the information. In this case, information identifying a terminal should be additionally included in the HS-DSCH control channel.

In case that the pilot bit of the forward dedicated channel is used for the HS-DSCH, the number of pilot bits transmitted from other cells and the cell transmitting the HS-DSCH when the terminal is in a handover region; The number of pilot bits of the may be different from each other. In this case, a method of simultaneously receiving different numbers of pilot bits received from each cell should be presented.

According to an embodiment of the present invention, two bits of four-bit pilot bits are used as the HS-DSCH indicator and the terminal has a connection with two cells. It will be described in detail how to receive the bit at the same time. In an embodiment of the present invention, the number of pilot bits is not 4 bits and the number of bits used as the HS-DSCH indicator is not 2 bits. The same applies to the case where the cell is connected at the same time.

26, 27, 28, and 29 are diagrams illustrating pilot bit information from two cells and combined information of the two cells according to the embodiment. In the drawings, Cell 1 represents a cell transmitting the HS-DSCH to the terminal, and Cell 2 represents a cell transmitting only the forward dedicated channel without transmitting the HS-DSCH.

In FIG. 26, 2601 represents four bits transmitted from Cell 1, and the preceding two bits, that is, two bits of the hatched portion, represent the HS-DSCH indicator and the following two bits. (bit) represents a pilot bit. 26 to 29, it is assumed that the pattern of the pilot bits is 1111. In fact, the pilot bit pattern is shown in Table 2 above. In FIG. 26, 2602 represents pilot bits received from Cell 2. As shown in FIG. 26, a terminal receiving bits from two cells may combine the respective bits as shown in 2603 of FIG. 26. In this case, since the preceding 2 bits received from Cell 1 contain information of the HS-DSCH indicator, the preceding 2 bits of the pilot bits received from Cell 2 are combined with the preceding 2 bits. Not) The terminal obtaining 2603 obtains an SIRest value for generating a TPC command by averaging the power of each bit. Since the process of estimating the SIRest value and comparing this value with the SIRtar value to generate a backward TPC command is separate from the contents of the present invention, a detailed description thereof will be omitted. In conclusion, FIG. 26 illustrates a method of processing pilot information and HS-DSCH indicator information received from different cells.

FIG. 27 illustrates a case where the HS-DSCH indicator information of the information transmitted from Cell 1 is different from that of FIG. 26. In this case, as in FIG. 26, the HS-DSCH indicator information is used for generating the TPC command and only the remaining pilot bits are used.

28 and 29 are combined with the preceding two bits received from Cell 2 to use the HS-DSCH indicator received from Cell 1 to generate a TPC command. It is a figure explaining the thing. As shown in 2801 of FIG. 28 and 2901 of FIG. 29, when the HS-DSCH indicator value is 11 or -1-1, the HS-DSCH indicator value is preferentially 11 and -1- The decision to classify as 1 is made. If it is determined as 11 thereafter, as shown in 2803 of FIG. 28, the TPC command is generated by combining the pilot bit received from Cell 2. When the HS-DSCH indicator value is determined to be -1-1, as shown in 2902 of FIG. 29, the code of the first two bits received from Cell 1 is first changed from-to + Cell. It combines with pilot bits received from 2. At this time, when the HS-DSCH indicator is not used as shown in FIGS. 26 and 27 or when the HS-DSCH indicator is combined with the pilot as shown in FIGS. 28 and 29. It may be determined based on a channel estimation value of the CPICH. That is, when the CPICH channel estimation value is good, pilot bit combining is performed by adjusting the code after determining the HS-DSCH indicator as shown in FIGS. 28 and 29. However, when the CPICH channel estimation value is not good, the HS-DSCH indicator is not combined with the pilot bit as shown in FIGS. 26 and 27.

Whether or not to combine the HS-DSCH indicator with a pilot bit may be determined in advance and every slot based on CPICH channel estimation as described above. It may be determined for each frame or every frame. Alternatively, the determination may be performed based on a pilot channel estimation value of a preceding slot instead of or in addition to the CPICH channel estimation value. It can also be determined based on a measurement value that can reflect the current channel state in any other way.

The combining method represented by the summation, etc. in FIGS. 26, 27, 28, and 29 is conceptual, and in actual development, a combination of pilot bits is obtained to obtain an average. The process may vary from case to case.

30 shows hardware HW according to the embodiment of the present invention.

In FIG. 30, 3001 denotes a CPICH channel estimator 3001 and performs channel estimation every slot or frame. The result of the channel estimation in the channel estimator 3001 is used as an input for controlling the switch 3004 of FIG.

The separator 3002 of FIG. 30 receives and separates a pilot and an indicator from Cell 1 transmitting the HS-DSCH. The separator 3002 sends the information bit of the HS-DSCH indicator to the signal determiner 3003 of FIG. 30 and directly sends the pilot bit to the SIRest generator 3005 of FIG. 30. do.

The signal determiner 3003 of FIG. 30 receives an HS-DSCH indicator to interpret an HS-DSCH indicator, and when the code of the HS-DSCH indicator differs from a pilot code. Is multiplied by 1, the sign is inverted and transmitted to the switch 3004 of FIG. 30, and when the same as the pilot code, the value is transmitted to the switch 3004 of FIG.

In FIG. 30, the switch 3004 uses an HS-DSCH indicator in which a signal (Sign) received from the signal determiner 3003 is modified by the signal determiner 3003 of FIG. 30. The SIRest generator 3005 may or may not be transmitted based on the CPICH channel estimation value received from the channel estimator 3001.

The SIRest generator 3005 of FIG. 30 generates SIRest using pilot bits received from Cell 1 and Cell 2 not transmitting HS-DSCH. According to the determination of the switch 3004 of FIG. 30, the SIRest may be generated by additionally receiving a pilot modified from the HS-DSCH indicator from the signal determiner 3003 of FIG. 30. The SIRest generator 3005 that generates the SIRest sends this value to the TPC generator 3006 of FIG.

The TPC generator 3006 of FIG. 30 generates a TPC based on the SIRest received from the SIRest generator 3005 of FIG. 30. The terminal adjusts the forward transmission power by transmitting the TPC value generated by the TPC generator 3006 of FIG. 30 using a reverse dedicated channel.

When using the present invention, it is possible to flexibly and efficiently transmit reverse control information of HSDPA. In other words, by classifying the transmission of reverse control information for HSDPA according to the nature of the information and by varying the transmission characteristics, it is possible to avoid the situation of always transmitting even if the control information is not necessary, and to reduce the probability of error occurrence of information of high importance. It is. In addition, by maintaining the reverse DPCCH of the existing UMTS communication system, compatibility can be maintained. In addition, when using the present invention, in the control information transmission on the forward dedicated channel for providing the HSDPA service, it is possible to transmit and receive information even when the terminal is in a handover area with the 3GPP R-99 cell.

Claims (11)

A method for transmitting control information required for supporting HSDPA to a mobile station through a forward dedicated control channel in a base station of a mobile communication system, And transmitting control information required for supporting the HSDPA in predetermined bits among pilot bits allocated to each frame or slot of the forward dedicated channel. The method of claim 1, And allocating one bit of the transport format combination indication (TFCI) bits allocated to one frame of the forward dedicated channel as bits for transmitting control information required to support the HSDPA. The method of claim 1, The control information required to support the HSDPA is characterized in that the HS-DSCH indicator. The method of claim 3, The HS-DSCH indicator is characterized in that the information indicating whether the HS-DSCH control channel access. The method of claim 3, Wherein the HS-DSCH indicator is information specifying whether to access an HS-DSCH control channel and information specifying a control channel to be accessed among control channels of the HS-DSCH. A first base station for transmitting pilot information by bits other than the bits for transmitting control information required for HSDPA support among pilot bits allocated for each frame or slot of a forward dedicated channel in a mobile communication system terminal; A method for simultaneously receiving the pilot information of different number of bits from a second base station transmitting only pilot information by the pilot bits allocated for one frame of the forward dedicated channel, Determining whether to combine control information required for supporting the HSDPA from the first base station and pilot information from the second base station; Combining the pilot information from the first base station and the pilot information from the second base station in corresponding bit units when combining with control information required for supporting the HSDPA is not required; When combining with control information required for supporting the HSDPA is requested, combining the control information and the pilot information from the first base station and the pilot information from the second base station in corresponding bit units The method characterized in that it comprises a. The method of claim 6, The determination as to whether the combining is determined by a measurement value reflecting the current channel state. The method of claim 6, The combining is determined in units of slots based on the channel estimation value of the CPICH. The method of claim 6, The determination of whether to combine is determined on a frame-by-frame basis based on a channel estimation value of CPICH. The method of claim 6, The determination of whether to combine is determined based on a pilot channel estimation value of a preceding slot. A method for transmitting HS-DSCH indicators for each of a plurality of mobile stations through a common indicator channel at a base station of a mobile communication system, Determining the number of mobile stations to provide the HS-DSCH indicators that can be transmitted on the common indicator channel by the spread rate of the common indicator channel; Associating the determined number of mobile stations in one-to-one correspondence with each of the bits constituting the common indicator channel; And recording and transmitting HS-DSCH indicators corresponding to each of the mobile stations in bits of the common indicator channel.