KR20030037398A - Method for high speed downlink packet access indicator transmission on associated channel in narrow band time division duplexing system - Google Patents

Abstract

PURPOSE: A device of transmitting/receiving an HSDPA(High Speed Downlink Packet Access) indicator of a CDMA mobile communication system and a method thereof are provided to select one bit combination by corresponding to a TPC command and the HSDPA indicator, and to transmit bits in accordance with the selected bit combination as TPC bits, thereby efficiently supplying a high speed data service in mobile terminals. CONSTITUTION: A terminal interprets a TPCamp;HI(HSDPA Indicator) field(601). The terminal decides whether information on the HI is true or false(602). If the information is false, the terminal decides whether TPC information of the received information is '0' or '1'(603). If the information is true, the terminal decides whether a TPC value is '0' or '1'(604). If the TPC information is '0', the terminal confirms that HS-DSCH data do not exist, and waits the next TTI. The terminal reduces power of an uplink dedicated channel(606). The terminal confirms that the HS-DSCH data is transmitted, interprets a shared control channel, and receives an HS-DSCH(607). The terminal increases the power of the uplink dedicated channel(608).

Description

TECHNICAL FIELD FOR HIGH SPEED DOWNLINK PACKET ACCESS INDICATOR TRANSMISSION ON ASSOCIATED CHANNEL IN NARROW BAND TIME DIVISION DUPLEXING SYSTEM}

The present invention relates generally to a method for transmitting downlink signaling for a high speed downlink packet access (HSDPA) service for a code division multiple access (CDMA) mobile communication system. In particular, the present invention relates to an HSDPA indicator. An apparatus and method for downlink signaling transmission.

High Speed Downlink Packet Access (HSDPA) is an ongoing standard in the 3rd Generation Partner Project (3GPP), which allows a mobile communication terminal (UE) to access high speed data services. To support this service, the base station Node B sends HSDPA-related information (eg, Transport Format and Resource Information, HARQ information, etc.) to the terminal as HSDPA data and downlink signaling. Thus, several new channels are designated for HSDPA signaling and data transmission. A high speed downlink shared channel (HS-DSCH) is used for HSDPA data transmission, and a downlink shared control transport channel transmits downlink signaling of information regarding HSDPA resource allocation and the like. There are two methods of downlink signaling transmission: one-stage scheme and two-stage scheme. In general, a two-stage signaling scheme is recommended because it consumes less power than the one-stage scheme. The two-stage approach means that the HSDPA Indicator (HI) must be transmitted on a dedicated channel (DPCH). After transmitting HI to a dedicated channel, HSDPA-related information is transmitted using a downlink shared control transport channel having a temporal relationship. HI is a type of downlink signaling that informs the UE of the existence of HSDPA data by a number or a simple on / off signal for a downlink shared control transport channel. The terminal receives the HI transmitted through the dedicated channel to check whether there is data to be received. If the HI indicates that the data exists, the terminal receives and interprets the information given in the downlink shared control transmission channel and uses the information to interpret the HS-DSCH data. Receive. Since the channel structures for the frequency division scheme (FDD) and the time division scheme (TDD) are different, the HI transmission scheme is also different.

Referring to FIG. 1, one frame is composed of two subframes. Meanwhile, the subframes include seven time slots (hereinafter referred to as "TSs"), a downlink pilot time slot (DwPTS), a guide period without signal transmission, and an uplink pilot time slot (UpPTS). ). Each of the seven TSs is divided into downlink timeslots and uplink timeslots. TSs for the downlink are TS # 0, TS # 4, TS # 5, and TS # 6 of the seven TSs, and TSs for the uplink are TS # 1, TS # 2 of the seven TSs. And TS # 3. In FIG. 1, a switching point means a point for switching between TS # 4 for the downlink and TS # 5 for the uplink. At this time, the length of the frame (T _f) is 10ms and the length (T _sf) of the sub-frame is 5ms. In addition, the length (T _slot ) of each of the TSs is 0.625 ms.

Each of the TSs shown in FIG. 1 has a configuration as shown in FIG. 2. The TS configuration shown in FIG. 2 assumes a TS that does not transmit a TFCI bit.

Referring to FIG. 2, the TS includes two data regions storing data symbols, a midamble region storing a midamble for power control, and a synchronization delay (hereinafter, referred to as "SS") symbol. And an TPC area storing TPC symbols. The total length of the slot consists of 864 chips and the midamble area consists of 144 chips. Further, in the TPC area, 2 bits when QPSK is used as a modulation method, and 3 bits of TPC information when 8PSK is used as a modulation method is recorded.

FDD, 3.84Mcps TDD and 1.28Mcps TDD systems are all defined by 3GPP. HSDPA standardization is deployed on these three CDMA systems. In general, a TDD CDMA mobile communication system refers to a CDMA mobile communication system in which a plurality of slots constituting one frame are divided into uplink and downlink channels, respectively. Here, the CDMA mobile communication system is classified into a TDD CDMA mobile communication system and an FDD CDMA mobile communication system in which a transmission frequency is divided from a reception frequency.

In the case of the FDD system, the HI consists of two signaling information bits related to the HS-DSCH for the corresponding UE, indicating whether the shared control channel exists. If the terminal does not have a shared control channel providing the HS-DSCH signaling information, HI is not transmitted (ie, discontinuous transmission). For example, if HI is transmitted with a QPSK code, the possible signaling points are shown in FIG.

In the case of the FDD system, a scheme using TFCI or pilot code for transmitting HI information has been proposed. The method minimizes the loss of data transmitted through the dedicated channel.

However, as far as the 1.28 Mcps TDD system is concerned, HI sends on / off signal information. There is also a problem in transmitting HI using TFCI. Therefore, a method of transmitting HI using a dedicated channel should be developed while minimizing data loss of the dedicated channel and maintaining compatibility with an existing system.

Accordingly, an object of the present invention is to propose a new method of transmitting an HSDPA indicator on a DPCH in a 1.28 Mcps TDD system of a CDMA communication system.

It is another object of the present invention to provide a transmission method by encoding a TPC bit and an HI bit in a DPCH burst of 1.28 Mcps TDD.

Finally, the present invention will consider a transmission method for arranging HI dedicated space.

In order to achieve the above object, the present invention provides a TPC bit of a predetermined number of bits transmitted through a dedicated physical channel in transmitting a fast forward packet access indicator in a base station transmitter of a narrowband time division duplexing code division multiple access mobile communication system. Among these bit combinations, any one bit combination is selected corresponding to the TPC command to be transmitted and the fast forward packet access indicator, and bits according to the selected bit combination are transmitted to the TPC bits.

1 illustrates a frame structure of a conventional 1.28 Mcps time division duplexing code division multiple access mobile communication system.

FIG. 2 is a view illustrating a structure of each of the slots of FIG. 1.

3 is a diagram illustrating a structure of a base station transmitter in a code division multiple access mobile communication system according to a first embodiment of the present invention.

4 is a diagram illustrating a structure of a terminal receiver in a code division multiple access mobile communication system according to a first embodiment of the present invention.

5 is a diagram illustrating a control flow for transmitting a fast forward packet access indicator according to a first embodiment of the present invention.

6 is a diagram illustrating a control flow for receiving a fast forward packet access indicator according to a first embodiment of the present invention.

7 is a diagram illustrating an example of a base station transmitter structure in a code division multiple access mobile communication system according to a second embodiment of the present invention.

8 is a diagram illustrating an example of a structure of a terminal receiver in a code division multiple access mobile communication system according to a second embodiment of the present invention.

9 is a diagram showing another example of a structure of a base station transmitter in a code division multiple access mobile communication system according to a second embodiment of the present invention.

10 is a diagram illustrating another example of a structure of a terminal receiver in a code division multiple access mobile communication system according to a second embodiment of the present invention.

11 is a typical

A diagram showing a configuration that does not include a transport format indicator (TFCI).

12 is a typical

A diagram showing a configuration including a transmission format indicator (TFCI).

13 is a diagram illustrating an example of transmitting a fast forward packet access indicator in a code division multiple access mobile communication system according to a second embodiment of the present invention;

14 is a diagram illustrating another example of transmitting a fast forward packet access indicator in a code division multiple access mobile communication system according to a second embodiment of the present invention.

15 is a diagram illustrating another example of transmitting a fast forward packet access indicator in a code division multiple access mobile communication system according to a second embodiment of the present invention.

16 is a view showing another example of transmitting a fast forward packet access indicator in a code division multiple access mobile communication system according to a second embodiment of the present invention.

17 is a diagram illustrating another example of transmitting a fast forward packet access indicator in a code division multiple access mobile communication system according to a second embodiment of the present invention.

18 is a diagram illustrating another example of transmitting a fast forward packet access indicator in a code division multiple access mobile communication system according to a second embodiment of the present invention.

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

First, the present invention proposes two embodiments. As a first example, TPC bits including a High Speed Downlink Packet Access Indicator (hereinafter referred to as "HI") are used. As a second embodiment, a new area for transmitting HI to a slot is newly allocated.

Two-stage signaling is used for HSDPA downlink signaling. The indicator is initially transmitted on the DPCH. This indicator is only an on / off signal that allows the terminal to read the associated shared control channel. When the terminal receives a transmission format resource on the shared control channel, the terminal can receive data for the HS-DSCH. When the terminal finishes receiving the HSDPA data from the base station, the transaction between the terminal and the base station is completed. There are two ways to carry HI information. One is to mix the HI information and decode the TPC bits, and the other is to separate one HI field and load the HI information. The time slot and burst structure for 1.28 Mcps is already given.

The 1.28Mcps TDD system transmits 1.28 million chips per second. One frame is 10ms long and is divided into two subframes of 5ms each. The system uses a time division communication scheme, where one subframe has seven traffic time slots, two pilot time slots, and a long monitoring period. This subframe structure is depicted in FIG. Each of the seven traffic time slots is assigned a number from 0 to 6 to carry signaling information or user data (eg, voice and data). The dedicated channel transmits voice among these seven time slots. Each time slot is occupied by one burst of 864 chips, which is divided into two 144 chip midambles and two 352 chip data segments. The midamble is never modulated or changed in wavelength. The two data parts are combined to encode the same channelization code and scramble code and change the wavelength.

First embodiment

The first embodiment of the present invention is a new method of encoding the TPC and HI together by changing the encoding method of the TPC bits in the DPCH burst for 1.28 Mcps TDD. The modified TPC coded bits carry the TPC command and HI information at the same time. The changed TPC field is called TPC & HI.

Since this coding scheme uses a DPCH burst structure for 1.28 Mcps TDD, a detailed description of the DPCH burst will have to be made first.

2 shows the positions of the TPC bits in one DPCH burst. The TPC field is located in the second data portion of the traffic burst, and is spread with the same spreading factor and spreading code as the data portion of each physical channel.

The first embodiment of the present invention reconfigures the TPC bits used for power control to include HI. That is, the conventional TPC bit is composed of 2 bits or 3 bits to control the transmission power of the mobile terminal. For example, when the TPC bit has "00" or "000", it is used as a command to increase the transmission power. When the TPC bit has "11" or "110", the command is to lower the transmission power. Was used. This is shown in Table 1 and Table 2 below.

TPC bit TPC command action 00 Down Lower transmit power 11 Up Increased transmit power

Table 1 shows an example of using the TPC bit in the case of using QPSK as a modulation method.

TPC bit TPC command meaning 000 Down Lower transmit power 110 Up Increased transmit power

Table 2 shows an example of using a TPC bit when 8PSK is used as a modulation method.

Typically, two kinds of information can be provided by two bits. However, as shown in Table 1, in the case of using the conventional QPSK, the TPC bit consisting of two bits is used to distinguish only two pieces of information. That is, "01" and "10", which can be represented as the two bits of TPC bits, have no meaning.

In general, the number of kinds of information that can be performed by three bits is eight kinds. However, as shown in Table 2, in the case of using the conventional 8PSK, a 3 bit TPC bit is used to distinguish only two pieces of information. That is, "001", "010", "011", "100", and "111", which may be represented as the three bits of TPC bits, have no meaning.

Accordingly, in the first embodiment of the present invention, HI information may be transmitted using branch numbers that may be represented as the TPC bits but are not in use. That is, in the first embodiment of the present invention, a TPC command and the HI are transmitted together by the TPC bits. Examples of the definition of TPC bits for transmitting the TPC command and the HI together are shown in the following tables.

First, examples in the case of using QPSK as a modulation method are shown in Tables 3 to 6 below.

TPC bits TPC command TPC Meaning HI meaning 00 Down Lower transmit power HSDPA data does not exist 01 Down Lower transmit power HSDPA data exists 10 Up Increased transmit power HSDPA data exists 11 Up Increased transmit power HSDPA data does not exist

TPC bits TPC command TPC Meaning HI meaning 00 Down Lower transmit power HSDPA data does not exist 01 Up Increased transmit power HSDPA data exists 10 Down Lower transmit power HSDPA data exists 11 Up Increased transmit power HSDPA data does not exist

In Tables 3 and 4, HI indicates an example of a false command indicating that HSDPA data does not exist in the case of 00 and 11 commands, which are conventional TPC commands. When the number of times of transmitting the HI from the base station is small, the HI indicates that there is no transmission by sending an existing TPC command and transmits new information 01 and 10 to indicate that HI is a command of trued. Meanwhile, the example shown in Table 3 may be interpreted differently. That is, the first bit of the TPC bits may be used as a TPC command, and the other bit may be used as HI. For example, when the first bit is "0", it is interpreted as a command to lower the transmission power, and when it is "1", the command to increase the transmission power is interpreted. In addition, when the second bit is "0", it is interpreted as a false command, and when the second bit is "1", it is interpreted as a true command.

TPC bits TPC command TPC Meaning HI meaning 00 Down Lower transmit power HSDPA data does not exist 01 Up Increased transmit power HSDPA data does not exist 10 Down Lower transmit power HSDPA data exists 11 Up Increased transmit power HSDPA data exists

TPC bits TPC command TPC Meaning HI meaning 00 Down Lower transmit power HSDPA data does not exist 01 Up Increased transmit power HSDPA data exists 10 Down Lower transmit power HSDPA data does not exist 11 Up Increased transmit power HSDPA data exists

In Tables 3 to 6, the meaning of the conventional TPC bits is not changed, and the mobile terminal can be notified of whether the HSDPA data is transmitted using an unused combination of the TPC bits. That is, TPC bits having a bit combination of "00" are used as a command to lower the transmission power, and TPC bits having a bit combination of "11" are used as a command to increase the transmission power.

Accordingly, the base station transmits the TPC bits on the dedicated physical channel (DPCH) according to any one of the examples of Tables 3 to 6, and the mobile station transmits the TPC bits transmitted on the DPCH. It is interpreted as used as an example above to determine whether to receive power control and HSDPA data.

Next, examples in the case of using 8PSK as a modulation method are shown in Tables 7 to 10 below.

TPC bits TPC command TPC Meaning HI meaning 000 Down Lower transmit power HSDPA data does not exist 011 Down Lower transmit power HSDPA data exists 101 Up Increased transmit power HSDPA data exists 110 Up Increased transmit power HSDPA data does not exist

TPC bits TPC command TPC Meaning HI meaning 000 Down Lower transmit power HSDPA data does not exist 011 Up Increased transmit power HSDPA data exists 101 Down Lower transmit power HSDPA data exists 110 Up Increased transmit power HSDPA data does not exist

TPC bits TPC command TPC Meaning HI meaning 000 Down Lower transmit power HSDPA data does not exist 011 Up Increased transmit power HSDPA data exists 101 Down Lower transmit power HSDPA data does not exist 110 Up Increased transmit power HSDPA data exists

TPC bits TPC command TPC Meaning HI meaning 000 Down Lower transmit power HSDPA data does not exist 011 Up Increased transmit power HSDPA data does not exist 101 Down Lower transmit power HSDPA data exists 110 Up Increased transmit power HSDPA data exists

In Tables 7 to 10, the meanings of the conventional TPC bits are not changed, and the mobile terminal can be notified whether HSDPA data is transmitted using an unused combination of TPC bits. That is, TPC bits having a bit combination of "000" are used as a command to lower the transmission power, and TPC bits having a bit combination of "110" are used as a command to increase the transmission power. Meanwhile, in Tables 7 to 10, a bit combination of "011" and "101" is additionally used for implementing the present invention, but another bit combination that can be made into 3 bits of TPC bits is used. It will be obvious that it can be used. However, the use of " 011 " and " 101 " as a bit combination for implementing the present invention is to transmit the TPC bits to the mobile terminal without error. That is, among the bit combinations that can be generated due to the 3 bit TPC bits, the bit combinations additionally used in Tables 7 to 10 are used as interference in the process of being transmitted to the wireless channel through the DPCH. This is because the probability of occurrence of errors due to this is the lowest.

As described above, a configuration of a base station transmitter of an NB-TDD code division multiple access mobile communication system for implementing TPC bits including HI indicating whether HSDPA data is transmitted is shown in FIG. 3. In FIG. 3, the TPC bit 811 and the HI 812 are input to the TPC & HI generating unit 813, and thus, desired TPC bits are output.

Referring to FIG. 3, the TPC bits 811 and the HI 812 to be transmitted are input to the TPC & HI generation unit 813, and the TPC & HI generation unit 813 is any of the examples described above. A TPC bit including the HI, that is, TPC & HI is generated and output to the multiplexer 820. Therefore, the TPC & HI is transmitted to the mobile terminal through the antenna 832 by a conventional process for transmission. That is, the transmitter of the base station in FIG. 3 knows what combination of TPC & HI will be transmitted. In FIG. 3, the TPC 811 and the HI 812 are inputs of the TPC & HI generator 813, and thus the output 814 is multiplexed in the TFCI 815, the SS 816, and the data 2 817 and the multiplexer 820. The bit stream of the multiplexer is deformed from serial to parallel, spread with channelization code 823, scrambled with scramble code 824, and time-multiplexed into the first data portion of the burst and midamble to form a chip sequence. This chip sequence is modulated and transmitted to the terminal.

The control flow for generating TPC & HI in the TPC & HI generating unit 813 is as shown in FIG. 5. The control flow shown in FIG. 5 is implemented with reference to <Table 3> of the embodiments of Tables 3 to 6.

Referring to FIG. 5, in step 601, the terminal interprets the TPC & HI field. In step 602 of FIG. 6, the UE determines whether information of HI is true or false in the information of the TPC & HI field received in step 601. In this case, if HI is true, the process moves to step 604 of FIG. 6, and if HI is false, the process moves to step 603 of FIG. 6. In step 603 of FIG. 6, the UE determines whether the TPC information of the information received in step 601 of FIG. 6 is 0 or 1. If the TPC information is 1, the process proceeds to steps 605 and 608 of FIG. 6. If the TPC information is 0, the process proceeds to steps 605 and 606 of FIG. 6. In step 604 of FIG. 6, it is determined whether the TPC value received in step 601 of FIG. 6 is 0 or 1. If the TPC value is 0, the process proceeds to step 606 and 607 of FIG. 6. If the TPC value is 1, the process proceeds to steps 607 and 608 of FIG. 6. In step 605 of FIG. 6, the terminal determines that there is no HS-DSCH data and waits for the next TTI. In step 606 of FIG. 6, the power of the reverse dedicated channel is reduced. In step 607 of FIG. 6, the UE confirms that there will be transmission of the HS-DSCH data and receives and interprets the corresponding shared control channel to receive the HS-DSCH. In step 608 of FIG. 6, the power of the reverse dedicated channel is increased.

On the other hand, the configuration of the mobile terminal receiver of the NB-TDD code division multiple access mobile communication system for receiving the TPC bit configured to include HI to interpret the meaning of the TPC command and HI is shown in FIG. In FIG. 4, the TPC & HI analyzer 916 receives TPC & HI as an input, and interprets the TPC bits and HI from the TPC & HI to separate and output the analyzed TPC bits and HI.

Referring to FIG. 4, an unsigned signal received through the antenna 931 is processed by the components of the front end of the demultiplexer 919, and the demultiplexer 919 includes TPC & HI, TFCI, SS, and second. A signal multiplexed with data is input. The demultiplexer 919 demultiplexes and outputs respective signals constituting the multiplexed signals, and TPC & HI of the output signals from the demultiplexer 919 is input to the TPC & HI analyzer 916. The TPC & HI analysis unit 916 analyzes the TPC bits and the HI from the TPC & HI to separate and output the analyzed TPC bits and the HI.

6 is a diagram illustrating a control flow of decoding the TPC & HI in the TPC & HI analysis unit 916 according to an embodiment of the present invention.

Referring to FIG. 6, the base station knows a TPC command and an HI state and receives encoded bits from the TPC and HI. First, the base station determines whether the TPC bit should be 00 or 01 when the TPC command points down or vice versa. The final TPC bit is then determined according to the HI meaning. If HI is true, the TPC bit is 01 and vice versa. This is the case when the QPSK scheme is used for TPC modulation. That is, the signal from the antenna is demodulated and demultiplexed into three parts of the first data part 925, the midamble 926, and the second data part 927. The second data portion is descrambled by scramble code 923 and despread by channelization code 922, then switched in parallel in series, demultiplexed to form various fields: TFCI 913, TPC & HI 917, SS 918 and data2 911. The TPC & HI bit is a TPC & HI decoder. Is interpreted according to the process of FIG. 6 to obtain the exact meanings of TPC 914 and HI 915.

Implementation method

The TPC & HI encoding scheme modification method will be described in detail with reference to Table 3 and Table 6 according to the first implementation technique of the present invention.

For 1.28 Mcps TDD of the QPSK modulation scheme, the coded bits can be modified as shown in Tables 3 and 4. 01 and 10 are another two representative bits for TPC down (up) and TPC up (down). If 01 or 10 is transmitted, HI notifies the terminal of the presence of HSDPA data. If there is no HSDPA data to be transmitted from the base station to the terminal, the TPC command bits do not need to be changed. In this case, the UE knows that TPC adjustment is normal and HI is false.

If an error occurs in the TPC bit, the UE does not detect it. However, the terminal will make a TPC and HI decision on the error bit. For example, as listed in Table 3, if 00 was sent to the terminal but the terminal received 01, the terminal would reduce the transmit power and prepare to receive HSDPA data.

In case of 1.28 Mcps TDD, the DPCH is also capable of 8PSK modulation. Table 2 shows the original coding scheme of TPC, and the modified TPC & HI coding is in Table 7/8. Since the unused code space of 8PSK is larger, TPC modifications using the 8PSK modulation scheme are preferred and more flexible. In other words, the error rate is relatively less than when using QPSK modulation.

Second embodiment

In the second embodiment of the present invention, a method of allocating and transmitting a new bit for HI will be described in detail.

In order to transmit HI, a plurality of bits are allocated to each dedicated channel slot to secure an HI field, and these bits may represent multiple shared control information. The terminal may optionally receive information from various shared control channels as instructed by HI. For example, if HI is 1, the terminal receives one shared control channel, and if 2, two terminals are received and two control information for the HS-DSCH are simultaneously received. Due to the burst structure of the 1.28 Mcps DPCH, various locations may be allocated for transmission to HI as shown in FIGS. 16-19. The burst structure of the DPCH defined in the standard can be confirmed with reference to FIGS. 14 and 15. As shown in FIGS. 16-19, when HI is transmitted, the HI field is additionally added to the existing burst structure shown in FIGS. However, the bits for HI can be assigned several bits, thus allowing the HI to be sent reliably.

The burst structure of the DPCH defined in the standard can be confirmed with reference to FIGS. 14 and 15. In the DPCH burst, it consists of the TFCI, TPC and SS fields or some fields. As an example, the TPC and SS fields are located in front of the TFCI field of the data2 part of FIG. 15. In FIG. 14, there are no TPC and SS fields in the DPCH burst, and only TFCI fields exist. The presence or absence of the TFCI, TPC, and SS fields is associated with a physical channel mapping scheme and an RNC scheduling mechanism.

10 shows a Node B side transmitter structure. HI is added as a separate field in the data2 section. FIG. 10 illustrates determination conditions as to whether the HI is located before the TFCI field (as indicated in FIG. 19 above) or after the TFCI field (FIG. 18 above). The TFCI 1011, TPC 1013, SS 1014, HI 1012 and data2 1015 fields are time-divided and located in one data stream. The time sequence of these fields is determined by the location of each field in the DPCH burst. The data stream is serial to parallel, spread using the OVSF code 1021, mixed through the scramble code 1022, and converted into a complex chip sequence. The chip permutation is modulated by time muxing with the chips in the data1 1001 field and midamble 1024 and then transmitted to the UE.

11 shows a UE-side receiver structure. After receiving the DPCH channel from the Node B, the UE demodulates the signal 1124 and converts the signal into a chip sequence. The receiver de-muxes the chip sequence 1123 into three different parts: data1 1123, midamble 1124 and data2 1125. The Data2 field is descrambled and despread, serialized, and transmitted in the form of a bit stream. The bit stream is then time de-mulxed to TFCI 1113, TPC 1115, SS 1116, HI 1114 and data2 1111.

HI may be placed in the data1 field of the DPCH burst. 12 and 13 show the case described above. 12 and 13 show the structure of a transmitter and a receiver, respectively. 16 and 17 illustrate a burst structure in which HI is located in a data1 field of a DPCH burst.

First embodiment

Several techniques for locating HI in DPCH bursts: 1) data1 or data2 fields, 2) before or after the TFCI field of all data, and 3) other locations that may increase reliability in the receiving process, e.g. SS Before or after the field.

The primary implementation for HI positioning is described above with reference to FIGS. 16 and 17. 16 and 17 illustrate a case where HI is placed after and before a TFCI field placed in a first half data portion of a DPCH burst.

Second embodiment

18 and 19 illustrate a different HI positioning technique than the case of FIGS. 16 and 17. FIG. 18 illustrates a case in which HI is located after a TFCI field placed in a late data portion of a DPCH burst. FIG. 19 illustrates a case where HI is located ahead of a TFCI field placed in a later data portion of a DPCH burst.

As described above, the present invention can transmit an indicator according to fast forward packet transmission using TPC bits that are conventionally used without a change in a time slot, thereby effectively providing a high speed data service in mobile terminals.

Claims (3)

A method for transmitting a fast forward packet access indicator in a base station transmitter of a narrowband time division duplexing code division multiple access mobile communication system, Selecting one of the bit combinations corresponding to the TPC command to be transmitted and the fast forward packet access indicator among the bit combinations of the TPC bits having a predetermined number of bits transmitted through the dedicated physical channel; And transmitting bits according to the selected bit combination to the TPC bits. An apparatus for transmitting a fast forward packet access indicator in a base station transmitter of a narrowband time division duplexing code division multiple access mobile communication system, A TPC & HI generation unit for selecting one of the bit combinations corresponding to the TPC command to be transmitted among the bit combinations of the TPC bits of a predetermined number of bits transmitted through the dedicated physical channel and the fast forward packet access indicator; And transmitting bits according to the bit combination selected from the TPC & HI generating unit to the TPC bits. A method for receiving a fast forward packet access indicator in a mobile terminal receiver of a narrowband time division duplexing code division multiple access mobile communication system, Separating TPC bits and the fast forward packet access indicator from TPC bits of a predetermined number of bits transmitted through a dedicated physical channel; And determining whether data is to be transmitted according to a fast forward packet access service by the separated fast forward packet access indicator.