RU2298878C2 - Transport-format data transfer - Google Patents

Abstract

FIELD: data transmission; radio transmitters.

SUBSTANCE: channel coding and speed coordination TFCI indicator pointing to definite combination of cyclic redundancy code is generated in flexible layer one of GERAN network transmitter wherein data pointing to transport format combination are enoded and integrated with content data to be included in radio data burst using TFCI indicator generation process and information from medium access control layer. TFCI indicator is encoded in coding process and inserted in data stream by means of TFCI indicator insertion process. Each code incorporates more bits than respective TFCI indicator and unambiguously identifies TFCI indicator. Encoded TFCI indicator is expanded on pre-interleaved block with fractions disposed in fixed positions within each burst. Then interleaving is made by means of interleaving device. Encoded TFCI indicator used with 50% speed data transfer channel functions as central segment of encoded TFCI indicator used in respective 50% speed data transfer channel. Extra loss is negligible but FER characteristic is essentially improved compared with full-speed transfer codes due to enhanced useful load of content data bits. Amount of encoded TFCI data transferred in 50% speed mode ensures enhanced ratio of transport-format combination data encoding efficiency to content data encoding efficiency which is at same level as ratio in full-speed data transfer mode.

EFFECT: enhanced data transfer speed.

12 cl, 7 dwg, 7 tbl

Description

FIELD OF THE INVENTION

The present invention relates to a radio transmitter device including a flexible layer one, in which data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, and also to a method for operating a radio transmitter including a flexible layer one, in wherein data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet. The invention also relates to a mobile device and to a base transceiver station.

State of the art

Currently, in GERAN Iu (GSM / EDGE radio network) mode, the MAC (Media Access Control Protocol) layer is responsible for mapping between logical channels (radio and control channels) and main physical subchannels (main physical channel for special purposes or jointly primary physical channel used). Logical channels are the channels that the physical layer offers to the MAC layer. The indicated logical channels and mapping to the main physical subchannels are fully defined by GSM / EDGE standards, making it possible to make functionality at the MAC level relatively simple.

In the UTRAN network (UMTS global radio communication network with subscribers), another approach is taken, where instead of providing logical channels, the physical layer offers transport channels (TrCH), which can be used by the MAC layer. A transport channel can be used to transmit a single stream over the air interface. Several transport channels can be active at the same time and are multiplexed at the physical level. Transport channels are configured by the network during the connection process.

The concept of transport channels is supposed to be used in GERAN. Each of these transport channels can carry one stream having a certain quality of service (QoS). Several transport channels can be multiplexed and sent on the same special-purpose physical subchannel, thereby making it possible, for example, to have different protection on different classes of bits. The configuration used on the transport channel, that is, the number of bits, encoding, interleaving, etc., is referred to as a transport format (TF) combination. As in a UTRAN network, several transport format combinations can be associated with one transport channel. For example, in adaptive multi-rate coding (AMR), class 1a bits have their own TrCH channel with one transport format combination configured for one AMR mode. The configuration format combinations of the transport format can be controlled by the network and transmitted to the mobile station when the connection is established. In both the mobile and the base transceiver station (BTS), transport format combinations can be used to configure encoder and decoder modules. When configuring a transport format combination, the network can choose between several preset cyclic redundancy code (CRC) lengths and code types. When establishing a connection for each of the transport channels, a predetermined number of transport format combinations can be configured.

It is assumed that transport blocks (TB) must be exchanged between the MAC layer and the physical layer based on the transport time interval (TTI) (for example, 20 ms). For each transport block, a transport format combination is selected and displayed through the transport format combination indicator (TFI). In other words, the TFI indicator says which channel coding to use for this particular transport block on a particular TrCH channel during the TTI interval.

In transport format combinations of various TrCH channels, only some combinations are valid. A valid combination is called a transport format combination (TFC). When transport format combinations are combined into TFC combinations, the sum of the output bits is added to the total number of valid bits in the radio data packet on the main physical subchannel, for example, 464 bits for full speed data channels with Gaussian keying with minimum frequency shift (GMSK). A set of valid TFC combinations on a physical subchannel is called a transport format combination set (TFCS).

To decode the received sequence, the receiver needs to know the active TFC combination for the radio packet. The specified information is transferred to the field of the indicator of combinations of a transport format (TFCI). This field is a level 1 header and has the same function as the overhead bits commonly used at present. Each of the TFC combinations within the TFCS set is assigned a unique TFCI indicator value, which should be first decoded by the receiver when a radio data packet is received. From the decoded TFCI value of the indicator, transport format combinations for various transport channels can be found, allowing decoding to begin.

Fig. 1A depicts the proposed architecture for a flexible GERAN layer one. Although it is inspired by the architecture that was standardized for UL in the UTRAN network, it is much simpler.

As shown in FIG. 1A, the physical layer includes the following processes in sequence with respect to each TrCH channel provided by level two: CRC code attachment, channel coding, broadcast segment correction, first interleaving, segmentation, rate matching, transport channel multiplexing, TFCI mapping indicator and second interleaving. In the step of attaching the CRC code, error detection through the CRC code is provided. The size of the CRC code used is fixed on each TrCH channel and is configured by a radio resource level (RRC) higher than level one and is a semi-static attribute of a transport format combination. The entire transport block is used to calculate the parity bits. Code blocks are derived from the process of attaching a CRC code.

Code blocks are then processed by a channel coding process producing encoded blocks. The channel coding used is selected by the RRC layer and can only be changed through transmission of higher level signals. The channel coding used is a semi-static attribute of the transport format combination, although in practice it is likely to be fixed for each TrCH channel. For the AMR specification, the same channel coding is used for all modems, and rate matching simply adjusts the code rate by flashing or repeating. In the correction step of the radio transmission segment, the correction of the size of the radio transmission segment adjusts (by filling in the free field of the code sequence with spaces) the input bit sequence to ensure that the encoded block can be segmented into S _i data segments of the same size. The first interleaver is a simple block interleaver with permutation between columns. Its purpose is to ensure that consecutive coded bits are not transmitted in a single radio data packet.

When the TTI interval is longer than the duration of the radio data packet, the input bit sequence is segmented by the segmentation process, and each S _i radio data segment is mapped to one radio data packet (S _i = transmission time / duration of the radio data packet). As a result, the input bit sequence is mapped onto S _i consecutive radio data packets.

The last three processes described (correction, first interleaving, and segmentation) are used only when the TTI interval is longer than the duration of the radio packet, and otherwise are transparent. For each encoded block, they produce S _i segments of radio data.

The speed matching process is the core of flexible level one. It makes the bits of the radio data segment on the transport channel repeat or flash. Levels above level one assign a rate matching attribute for each transport channel. This attribute is semi-static and can only be changed through the transmission of higher level signals. Once the number of bits to be repeated or deleted is calculated, the rate matching attribute may begin. The higher the attribute value, the more important the bits (more repetition / less flashing). Since block size is a dynamic attribute, the number of bits on a transport channel may vary between different transmission times. When this happens, the bits are repeated or flashed to ensure that the total bit rate of the data after multiplexing TrCH channels is identical to the total bit rate of the channel data of the dedicated special-purpose physical channels. The output of data from the rate matching process is called a radio transmission frame. For each transmitted radio data packet, the rate matching produces one radio transmission frame per radio data segment, for example, on a TrCH channel.

In the step of multiplexing TrCH channels, for each transmitted radio data packet, according to the TFC combination, one radio transmission frame from each TrCH channel is delivered for multiplexing TrCH channels. These radio frames are sequentially multiplexed into an encoded composite transport channel (CCTrCH). For each transmitted radio data packet, a TFCI encoded indicator is attached at the beginning of the CCTrCH channel through the process of displaying the TFCI indicator before interleaving. The coded TFCI indicator and CCTrCH channel are interleaved together by a second interleaving step on the radio data blocks. Interleaving can be either diagonal or block rectangular, and is configured when the connection is established.

An alternative architecture is shown in FIG. Here, the correction of the radio data segments, the first interleaving and the segmentation process of the architecture of FIG. 1A are omitted.

SUMMARY OF THE INVENTION

According to a first aspect of the present invention, there is provided a radio transmitter device in which data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, the device being configured to include in a radio data packet for a data channel with a full code rate selected from a set that correlates the data of the transport format combination with the codes, the codes having more bits than the data of the corresponding transport format combination mat, and identify them, while the device is configured to operate in a mode in which data is transmitted on the channel at a lower speed than in the data channel at full speed to include in the radio data packet encoded data combinations of the transport format that make up the part smaller than an integer of a code selected from a set of codes.

According to a second aspect of the present invention, there is provided a radio transmitter apparatus in which data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, the device being configured to include in the radio data packet for the data channel at full speed a certain amount of encoded data combination of transport format, which leads to an increase in the specific ratio of coding efficiency format to the efficiency of the encoded content data, while the device is operable in a mode in which data is transmitted on a channel at a lower speed than on a data channel at full speed to include a certain amount of encoded data of a transport format combination in a radio data packet, which leads to an increase in the ratio of the encoding efficiency of the transport format combination data to the efficiency of the encoded content data, which is one level ratio of a data channel at full speed.

The transmitter device of the above aspects preferably comprises a flexible layer of one. The term "flexible layer one" should be understood as a physical layer that can simultaneously support many active independently configured transport channels. The device according to these aspects of the invention preferably comprises an interleaver for interleaving the encoded data of the transport format combination with the encoded content data. The radio transmitter device may be included, for example, in a mobile phone or in a base transceiver station.

According to a third aspect of the present invention, there is provided a method for operating a radio transmitter in which data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, which comprises including a code selected in the radio data packet for a full-speed data channel from a set correlating data of a combination of a transport format with codes, moreover, codes have more bits than data of a corresponding combination of a transport format, and identifies their comfort, and in a mode in which data is transmitted on the channel at a slower rate than the data channel full rate, include a packet radio data coded transport format combination data constituting a part smaller than the whole code selected from a set of codes.

According to a fourth aspect of the present invention, there is provided a method for operating a radio transmitter in which data indicative of a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, which comprises including a certain amount of encoded data in the radio data packet for a data channel at full speed combination data of the transport format, which leads to an increase in the specific ratio of the coding efficiency of the data combination of the transport format to the efficiency of encoded content data, and in a mode in which data is transmitted on a channel at a lower rate than on a data transmission channel at full speed, a certain amount of encoded data of a transport format combination is included in the radio data packet, which leads to an increase in the ratio of encoding efficiency of data of a transport combination format to the efficiency of the encoded content data, which is on par with the ratio in the data transmission channel at full speed.

Preferably, the relationship is essentially the same. An advantage of the aforementioned aspects of the present invention is that, compared with the prior art, it is possible to transmit at full speed without any significant reduction in the transmission reliability characteristics of more content data per radio data packet on fewer data transmission channels.

In any of these aspects of the invention, encoded transport format combination data in a lower rate mode may comprise a number of bits equal to or almost equal to the number of bits in the full rate code multiplied by the ratio of the lower data rate data bit rate to the bit rate data transmission channel data transmission at full speed. Also, encoded combination data of a transport format for a data channel at a lower rate may form a central segment of a code selected from a set. These features are especially useful when codes having some suitable properties are used, since they can provide a balance between the decoding rate of the transport format combination data and the amount of content data that can be transmitted. Codes proposed for use in TFCI indicators of the GERAN network are especially suitable.

The invention has a specific application to a GERAN network in Iu mode and in other modes. However, the invention is more widely applicable than the GERAN application described in the embodiments.

Brief Description of the Drawings

The invention is further explained in the description of specific options for its implementation with reference to the accompanying drawings, in which:

figa and 1B depict alternative architectures of the physical layer or flexible layer one, proposed for use in the GERAN network,

figure 2 depicts a mobile communication system that implements the components according to the present invention,

figure 3 depicts a block diagram of a mobile station system of figure 1,

figure 4 depicts a block diagram of a base transceiver station of the system of figure 1,

5 illustrates the lower layers of the protocol stack used in an embodiment of the present invention, and

6 illustrates radio signal generation by a transmitter and a method according to the present invention.

Detailed Description of Preferred Embodiments

Now, by way of example, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 2, the mobile telephone network 1 comprises a plurality of switching centers, including the first and second switching centers 2a, 2b. The first switching center 2a is connected to a plurality of base station controllers, 3a, 3b. The second switching center 2b likewise connects to a plurality of base station controllers (not shown).

The first base station controller 3a is connected to and controls the base transceiver station 4 and a plurality of other base transceiver stations. The second base station controller 3b likewise connects to and controls a plurality of base transceiver stations (not shown).

In this example, each base transceiver station serves a respective cell. So, the base transceiver station 4 serves the cell 5. Alternatively, one base transceiver station can serve multiple cells through directional antennas. A number of mobile stations 6a, 6b are located in the cell 5. The number and identity of mobile stations in a given cell varies over time.

The mobile telephone network 1 is connected to a public switched telephone network 7 by means of a gateway switching center 8.

The network packet service aspect includes a plurality of packet service support nodes 9 that are connected to respective sets of base station controllers 3a, 3b. At least one packet service support gateway node 10 connects each packet service support node 10 to the Internet 11.

Switching centers 3a, 3b and nodes 9 support packet service have access to the register 12 location within their own network.

The communication between the mobile stations 6a, 6b and the base transceiver station 4 employs a time division multiple access (TDMA) scheme.

As shown in FIG. 3, the first mobile station 6a comprises an antenna 101, an RF subsystem 102, a low frequency digital signal processing (DSP) subsystem 103, an analog audio subsystem 104, a speaker 105, a microphone 106, a controller 107, a liquid crystal display 108, a keyboard 109, a memory 110, a battery 111, and a power circuit 112.

The RF subsystem 102 comprises the IF and RF circuits of the transmitter and receiver of the mobile telephone and a frequency synthesizer for tuning the transmitter and receiver of the mobile station. An antenna 101 is coupled to an RF subsystem 102 for receiving and transmitting radio waves.

The low-frequency DSP subsystem 103 is connected to the RF subsystem 102 for receiving group signals from it and for transmitting group modulating signals to it. The low-frequency DSP subsystem 103 has encoder-decoder functions that are well known in the art.

The analog audio subsystem 104 is coupled to the low frequency DSP subsystem 103 and receives demodulated audio signals from it. The analog audio subsystem 104 amplifies and demodulates the audio signals and routes them to the loudspeaker 105. The acoustic signals detected by the microphone 106 are pre-amplified by the analog audio subsystem 104 and transmitted to the low frequency DSP subsystem 103 for encoding.

The controller 107 controls the operation of the mobile phone. It is coupled to the RF subsystem 102 for providing tuning instructions to a frequency synthesizer, and to the low frequency DSP subsystem 103 for supplying control data and management information for transmission. The controller 107 operates according to a program stored in the memory 110. The memory 110 is shown separately from the controller 107. However, it can be integrated with the controller 107.

The display device 108 is connected to the controller 107 for receiving control data, and the keyboard 109 is connected to the controller 107 for supplying input signals therein.

The battery 111 is connected to a power circuit 112, which provides adjustable power at various voltages used by the components of the mobile phone.

A controller 107 is programmed to control a mobile station for voice and data transmission and with application programs, such as, for example, a WAP (Wireless Access Protocol) client browsing program that takes advantage of the data transmission capabilities of the mobile station.

The second mobile station 6b is configured in a similar manner.

As shown in FIG. 4, a greatly simplified base transceiver station 4 comprises an antenna 201, an RF subsystem 202, a low frequency digital signal processing subsystem (DSP) 203 106, a base station controller interface 204, and a controller 207.

The RF subsystem 202 contains the IF and RF circuits of the transmitter and receiver of the base transceiver station and a frequency synthesizer for tuning the transmitter and receiver of the base transceiver station. An antenna 201 is coupled to an RF subsystem 202 for receiving and transmitting radio waves.

The low-frequency DSP subsystem 203 is connected to the RF subsystem 202 for receiving group signals from it and for transmitting group modulating signals to it. The low-frequency DSP subsystems 203 have encoder-decoder functions that are well known in the art.

The base station controller interface 204 interfaces the base transceiver station 4 with its control controller of the base station 3a.

The controller 207 controls the operation of the base transceiver station 4. It is connected to the RF subsystem 202 to provide tuning instructions to the frequency synthesizer, and to the low-frequency DSP subsystem to supply control data and management information for transmission. Controller 207 operates according to a program stored in memory 210.

When used for exchanging voice messages with circuit switched channels, a channelization scheme is used, as in a GSM network.

Low-frequency DSP subsystems 103, 203 and controllers 107, 207 of mobile stations 6a, 6b and base transceiver stations 4 are configured to execute two protocol stacks. The first protocol stack is for circuit-switched messaging and is essentially the same as that used in well-known GSM networks. The second protocol stack is for packet-switched messaging.

As shown in FIG. 5, the layers essential for the radio link between the mobile station 6a, 6b and the base station controller 4 are the Radio Link Control (RLC) layer 401, the Transmission Media Access Control (MAC) layer 402, and the physical layer or flexible layer one (FLO) 403. There are other levels above the levels shown, but for simplicity they are not shown.

The radio link control layer 401 has two modes: transparent and opaque. In transparent mode, data is simply sent up or down without modification through the radio link control layer.

In the opaque mode, the radio link control layer 401 enables the adaptation of the communication lines and builds data blocks from data modules received from higher levels by segmenting or concatenating the data modules as needed, and performs a reciprocal process for the data that passes onto the stack. He is also responsible for detecting lost data blocks or for reordering a data block for upstream conversion of their contents, depending on whether the acknowledgment mode is used. This level also provides error correction by retransmission in confirmation mode.

The medium access control layer 402 is responsible for allocating data blocks from the radio link control layer 401 to the respective transport channels and for sending the received radio data packets from the transport channels to the radio link control layer 401.

The physical layer 403 is responsible for generating the transmitted radio signals from the data passing through the transport channels, and for sending the received data upward through the corresponding transport channel to the transmission medium access control layer 402. The physical layer 403 has the architecture shown in FIG.

As shown in FIG. 6, data produced by application programs 404a, 404b, 404c propagates the protocol stack down to the physical layer 403a, 403b. The physical layer 403a, 403b carries data from application programs 404a, 404b, 404c on various transport channels 405, 406, 407 according to the class to which the data belongs. Each transport channel 405, 406, 407 can be configured to process signals according to a variety of processing circuits 405a, 405b, 405c, 406a, 406b, 406c, 407a, 407b, 407c. The configuration of the transport channels is established at the time of establishing a connection based on the capabilities of the mobile station 6a, 6b and the network, and the nature of the operating application or applications 404a, 404b, 404c.

Processing schemes 405a, 405b, 405c, 406a, 406b, 406c, 407a, 407b, 407c are uniquely defined combinations of cyclic redundancy check 405a, 406a, 407a, channel coding 405b, 406b, 407b and matching rates 405c, 406c, 407c. These uniquely defined processing schemes are the aforementioned TFCs (transport format combinations). Other processing steps shown at the physical level of FIG. 1 are omitted in FIG. 6 for simplicity. Steps 405d, 406d, and 407d are auxiliary interleaving steps that are omitted from FIG. 1.

The combined data transmission rate produced for the transport channels 405, 406, 407 must not exceed the transmission rate of the mobile station 6a, 6b. This sets a limit on transport format combinations that may be allowed. For example, if there are three transport formats TF1, TF2, TF3 for each transport channel, then the following combinations may be valid, thus compiling TFCI indicators: -

TF1 TF1 TF2

TF1 TF3 TF3,

but the following combinations may not be fair, and thus do not constitute TFCI indicators: -

TF1 TF2 TF2

TF1 TF1 TF3.

Data output by transport channel interleaving processes is multiplexed by multiplexing process 410, and then further interleaved 411.

A TFCI indicator is generated by a process 412 for generating a TFCI indicator from information from a medium access control layer, and is encoded by an encoding process 413. The TFCI encoded indicator is attached to the start of the data stream through the insertion process of the TFCI indicator. Then, interleaving with interleaver 411 is performed. The TFCI encoded indicator does not undergo variable interleaving, allowing the receiving station to easily determine its location. Accordingly, the receiver can invert the signal, identify and decode the TCFI encoded indicator, and use the decoded TFCI indicator to separate and decode the transport channels.

The TFCI indicator codes proposed for GMSK data transmission channels at full speed are: 1 TFCI bit encoded with 8 bits, 2 TFCI bits encoded with 16 bits, 3 TFCI bits encoded with 24 bits, 4 TFCI bits encoded with 28 bits, and 5 bits TFCI encoded with 36 bits. Each TFCI indicator refers to the code one to one, as shown below in tables 2-6. This is a code (also called a TFCI encoded indicator) that is distributed across the block before interleaving. Codes are selected from the group of codes shown in the tables. It should be understood that each code has more bits than the corresponding TFCI indicator, and uniquely identifies the TFCI.

A certain amount of encoded transport format combination data (TFCI encoded) leads to an increase in the specific ratio of transport format combination data encoding efficiency to encoded content data efficiency. It is preferable that the ratio be greater than unity, since this implies that the encoding used to encode TFCI is stronger than the encoding used to encode content data. The ratio of the performance of the encoded TFCI indicator data to the performance of the encoded content data resulting from such a configuration can be measured using any suitable model. Efficiency can be measured, for example, as the frequency of occurrence of erroneous blocks or the frequency of occurrence of erroneous frames. It is preferable that the frequency of occurrence of erroneous frames, including errors of the TFCI indicator, exceed by no more than 1 dB the frequency of occurrence of erroneous frames without a TFCI indicator. Preferably, the frequency of occurrence of erroneous frames exceeds by no more than 0.5 dB the frequency without a TFCI indicator. A 0.5 dB reduction in efficiency may be considered acceptable in terms of redundant content data that can be transmitted over the channel.

Half speed (HR) data channels are allowed at a flexible level of one 403. For a given amount of content data, the coding rate is half the coding rate of the data channels at full speed, or almost half the intensity (for example, 0.52 or 0.48 of the intensity )

The inventors performed tests with a half-speed data channel using a data packet size of 100 bits, which with a block transmission interval of 20 ms leads to a 5 kbit / s channel. In these tests, each data block was processed through a six-bit CRC code, and the mother code was used with one third of the transmission speed with a carrier frequency of 900 MHz. An encoded TFCI indicator was inserted before data interleaving using four packet diagonal interleaving. The result of this interleaving was the distribution of bits of the TFCI-encoded indicator reordered in four packets using the position with even numbers of the first two blocks and odd positions of the last two blocks. Testing was carried out for each of the possible lengths of the encoded TFCI indicator, and each test included processing of 20,000 blocks. The test results are shown in table 1. In table 1, two types of the frequency of occurrence of erroneous frames (FER) were compared: one where the FER is estimated using the CRC code on the data block, and one where the errors resulting from incorrect decoding of the TFCI indicator were included. The characteristic of the control level of error-free data transmission, when applied to codes on the FLO half-speed data channel, at which the final summary was performed, was evaluated using the TU3iFH models.

Table 1 TFCI code TFCI Error Rate Fer Error rate FER + TFCI Initiated losses TFCI 1-8 2,30 10.59 10.59 0,0 TFCI 2-16 2,30 10.59 10.59 0,0 TFCI 3-24 2.28 11.03 11.03 0,0 TFCI 4-28 3.08 11.17 11.17 0,0 TFCI 5-36 2.93 12.01 12.01 0,0

The rightmost column of Table 1 shows the dB loss due to incorrect decoding of the TFCI indicator. As can be seen from the table, there is no loss at any of the code rates, and thus the performance can be considered satisfactory. However, considering the frequency of occurrence of TFCI errors compared to FER, a performance difference of approximately 8 dB is observed for all codes. This fact indicates that the effective code rate of the TFCI indicator is much larger than that of the data block. The invention arose in part from this observation. By decreasing the coding on the TFCI indicator, the half-bit data channel bits can be freed for content data.

According to the invention, the codewords used for full-speed data channels are halved in length, and shorter words are applied to the half-speed data channels. Also, transport format encoded melon combinations used for half rate data channels are part of the corresponding TFCI encoded indicator used for full speed data channels. The inventors have found that using the middle segment of each codeword provides better performance due to the properties of the words. Accordingly, the TFCI encoded indicator used with the half rate data channel is the center segment of the TFCI encoded indicator used in the corresponding full speed data channel. The code provided for interleaving is provided by the encoding process 413 based on the channel rate and TF information.

The codes used in half rate data channels are illustrated below in Tables 2-6. In these tables, TFCI is given in the leftmost column, and TFCI encoded for full speed data channels is given in the leftmost column, with the bits used for half speed data channels forming the middle segment of the full speed data channel codes. The codewords for a 1-bit TFCI indicator consist of 3-6 GMSK codewords for data transmission channels at full speed, as shown in Table 2.

table 2 Bit 1 2 3 4 5 6 7 8 0 1.1, 1,1,1,1, 1,1 one 0,0, 0,0,0,0,0, 0,0

For a two-bit TFCI indicator for full-speed data channels, bits five through twelve are used for half-speed data channels, as shown in Table 3:

Table 3 Bit 1 2 3 4 5 6 7 8 9 10..12 13 .. 16 0,0 1,1,1,1,1,1,1,1,1,1,1,1,1 1,1,1,1 0.1 1,0,0,1,0,0,1,0,0,1,0,0 1,0,0,1 1,0 0,1,0,0, 1,0,0,1,0,0,1,0, 0,1,0,0 1,1 0,0,1,0, 0,1,0,0,1,0,0,1, 0,0,1,0

For a three-bit TFCI indicator for full-speed data channels, bits seven to eighteen are used for half-speed data channels, as shown in table 4:

Table 4 Bit 1 2 3 4 5 6 7 8 ... ... 18 19 .... 24 0,0,0 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 1,1,1,1,1,1 0,0,1 1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1 0,1,0 1,0,0,1,1,0, 0,1,0,0,1,1,0,0,1,0,0,1, 1,0,0,1,0,0 0,1,1 1,0,0,0,0,0,1,1,0,0,0,0,0,1,1,1,1,0,0,0 0,1,1,1,0,0 1,0,0 0,1,0,1,0,1, 0,0,1,0,1,0,1,0,0,1,0,1, 0,1,0,0,1,0 1,0,1 0,1,0,0,1,0,0 1,0,1,0,0,1,0,1,0,1,0,0,0 1,0,1,0,1,0 1,1,0 0,0,1,1,0,0, 1,0,0,1,1,0,0,1,0,0,1,1, 0,0,1,0,0,1 1,1,1 0,0,1,0,1,1,0,0,0,1,0,1,1,0,0,0,1,0,0 1,1,0,0,0,0,1

For a four-bit TFCI indicator for full-speed data channels, bits eight to twenty-one are used for half-speed data channels, as shown in table 5:

Table 5 Bit 1 2 3 4 5 6 7 8 9 .... 21 22 ... 28 0,0,0,0 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 1,1,1 0,0,0,1 1,1,1,1,1,0,0,1,0,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1 1,0,0,0 0,0,0 0,0,1,0 1,1,1,0,0,1,0,0 1,0,0,1,1,0,0,0,1,1,1,0,0,0,0,1,1,1,1 1,0,0 0,0,1,1 1,1,1,0,0,0,0,0, 0,1,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0 0,1,1 0,1,0,0 1,0,0,1,1,1,0, 1,1,0,0,0,1,0,0,1,0,0,1,1,0, 0,1,1,0, 0,1,1 0,1,0,1 1,0,0,1,0,0,1,1,0,0,1,0,0,1,1,1,0,0,1,1,0,0,0,0,1 1,0,0 0,1,1,0 1,0,0,0,1,0,0,0,1,1,1,1,1,0,1,0,1,0,0,0,0,0,1,1,1,1,0,0 0,0,0 0,1,1,1 1,0,0,0,0,1,1,1,0,0,1,0,1,1,0,1,1,0,0,0,0,0,1,0,0,0,1 1,1,1 1,0,0,0 0,1,0,1,1,1,0,0,0,0,0,0,1,0,1,1,0,1,0,1,0,1,1,1,0,0,1 0,1,0 1,0,0,1 0,1,0,1,0,0,1,1,1,0,0,1,1,1,0,0,0,1,0,1,0,1,0,0,1,0 1,0,1 1,0,1,0 0,1,0,0,1,0,0, 1,0,1,1,0,1,0,1,0,1,0,0,1,0, 1,1,0,1, 0,0,1 1,0,1,1 0,1,0,0,0,1,1,1,1,1,1,0,0,0,1,0,0,1,0,0,1,0 1,0,0,0 1,1,0 1,1,0,0 0,0,1,1,0,1,0, 0,1,1,1,0,0,0,0,1,0,0,1,1,0,0, 1,1,0,0, 1,1,0 1,1,0,1 0,0,1,1,0,0,0, 1,0,1,0,1,1,1,0,0,0,1,1,0,0, 1,0,1,1, 0,0,1 1,1,1,0 0,0,1,0,1,1,1,0,0,0,1,0,1,1,0,0,0,1,0,1,1,1,1,0,0,0 1,0,1 1,1,1,1 0,0,1,0,1,0,1, 1,1,0,0,1,0,0,1,0,0,1,0,1,1, 0,0,1,1, 0,1,0

For a five-bit TFCI indicator for full-speed data channels, bits from the tenth to twenty-seventh are used for half-speed data channels, as shown in table 6:

The performance when using these codes was evaluated by testing, using the same assumptions as yours were given. The results of the error-free data transfer control layer are summarized in table 7 below.

Table 7 TFCI code TFCI Error Rate Fer Error FER + TFCI Triggered loss in dB 1 bit TFCI TFCI 1/8 mid 4 bits 3.95 10.11 10.13 0.02 TFCI 1/8 2,30 10.59 10.59 0.00 2 bits TFCI TFCI 2/16 mid 8 bits 4.67 10.48 10.50 0.02 TFCI 2/16 2,30 10.59 10.59 0.00 3 bits TFCI TFCI 3/24 mid 12 bits 5.26 10.40 10.42 0.02 TFCI 3/24 2.28 11.03 11.03 0.00 4 bits TFCI TFCI 4/28 Mid 14 Bits 6.04 10.56 10.58 0.02 TFCI 4/28 3.08 11.17 11.17 0.00 5 bits TFCI TFCI 5/36 mid 18 bits 6.66 10.77 10.82 0.05 TFCI 5/36 2.93 12.01 12.01 0.00

It can be seen that the additional losses when using the middle segment of the full-speed transmission codes for half-speed data channels are so small that they can be neglected, which means that the reduced TFCI coding of the indicator does not introduce additional frame losses. The FER characteristic is significantly improved compared to using full speed transmission codes as a result of the increased payload of the content data bits. The FER characteristic improves by 0.5 dB for TFCI indicators with a length of 1 bit, by 0.1 dB for TFCI indicators with a length of 2 bits, by 0.6 dB for TFCI indicators with a length of 3 bits, by 0.6 dB for TFCI indicators with a length of 4 bits and 1.2 dB for a 5-bit TFCI indicator. The amount of encoded data of the TFCI indicator leads to an increase in the ratio of the encoding efficiency of the transport format combination data to the efficiency of the encoded content data, which is on par with the ratio in the data transmission mode at full speed.

As a result, the encoded data of the transport format combination is included in the radio data packet, making up a part smaller than the integer of the code selected from the set of codes used for data transmission channels at full speed. Each reduced code consists of a segment having half the code length used for data transmission channels at full speed, and is taken from the middle of the corresponding code.

Although the embodiment uses GMSK channels, it should be understood that the invention is also applicable to signals modulated using other modulation techniques, such as, for example, 8PSK. Moreover, other codes may be used to represent these transport format combinations, although if different codes are used, performance may vary. Channels that use shorter codes may be data channels at a rate of one fourth, or at any other suitable rate. The amount of code that must be taken to provide acceptable levels of efficiency depends on the properties of the codes and on the ratio of the bit rate of the channel data to the bit rate of the channel data at full speed.

Claims (12)

1. A radio transmitter device in which data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, the device being configured to include in a radio data packet for a data channel with a full code rate selected from a set of codes, when this, each code in the set is associated with the data of the combination of the transport format, and each code has more bits than the data of the corresponding combination of the transport format, and identifies them, and the device is configured to operate in a mode in which data is transmitted on a channel at a lower rate than in a data transmission channel at full speed to include in a radio data packet encoded data a transport format combination constituting a part smaller than an integer of a code selected from a set codes. 2. The device according to claim 1, containing a flexible layer one (403), and the flexible layer one contains a physical layer that can simultaneously support many active independently configurable transport channels, while the physical layer is responsible for creating transmitted radio signals from data passing through transport channels, and for passing the received data upward through the corresponding transport channel to the level of access control to the transmission medium. 3. The device according to claim 1, in which the encoded combination data of the transport format in a mode with a lower rate contain a number of bits equal to or almost equal to the number of bits in the code at a full rate times the ratio of the bit rate of the data channel of the data channel with a lower speed to the bit rate of the data channel of the data channel at full speed. 4. The device according to claim 1, in which the encoded combination data of the transport format for the data channel with lower speed form the Central segment of the code selected from the set of codes. 5. The device according to claim 1, comprising an interleaver (411) for interleaving the encoded data of the transport format combination with the encoded content data. 6. A radio transmitter device in which data indicating a combination of a transport format is encoded and combined with encoded content data to be included in a radio data packet, the device being configured to include a combination of transport format in a radio data packet for a data channel at full speed, wherein the amount of encoded data combination transport format leads to an increase in a certain ratio of the coding efficiency of data combination transport ortho format to the efficiency of the encoded content data, and the device is configured to operate in a mode in which data is transmitted on a channel at a lower rate than on a data transmission channel at full speed to include a transport format combination in the radio data packet, wherein the amount of encoded data of the combination of the transport format is selected so that leads to an increase in the ratio of the efficiency of encoding the data of the combination of the transport format to the efficiency This encoded content data is at the same level as the ratio in the data channel at full speed. 7. The device according to claim 6, containing a flexible layer one (403), the flexible layer one containing a physical layer that can simultaneously support many active independently configurable transport channels, while the physical layer is responsible for creating transmitted radio signals from data passing through transport channels, and for passing the received data upward through the corresponding transport channel to the level of access control to the transmission medium. 8. The device according to claim 6, comprising an interleaver (411) for interleaving the encoded data of the transport format combination with the encoded content data. 9. A mobile phone containing a radio transmitter according to any one of the preceding paragraphs. 10. A base transceiver station comprising a radio transmitter device according to any one of claims 1 to 8. 11. A method of operating a radio transmitter in which data indicating a combination of a transport format is encoded and combined with content data for inclusion in a radio data packet, which comprises including in a radio data packet for a data channel at full speed a code selected from a set of codes, moreover, each code in the set is associated with the data of the combination of the transport format, and each code has more bits than the data of the corresponding combination of the transport format, and identifies them, and in the mode in which yes nye transmitted on the channel at a slower rate than the data channel full rate, include a packet radio data coded transport format combination data constituting a part smaller than the integer code selected from a set of codes. 12. A method of operating a radio transmitter in which data indicating a combination of a transport format is encoded and combined with encoded content data to be included in a radio data packet, which method includes encrypted transport format combination data in a radio data packet for a data channel at full speed, moreover, the amount of encoded data of a combination of a transport format causes an increase in a certain ratio of the coding efficiency of data of a combination of transport format to the efficiency of the encoded content data, and in a mode in which data is transmitted on a channel at a lower rate than on a data transmission channel at full speed, encoded transport format combination data is included in the radio data packet, and the amount of encoded transport format combination data is selected as which leads to an increase in the ratio of the coding efficiency of the transport format combination data to the efficiency of the encoded content data, which is on a par with carrying in the data channel at full speed.

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